JP2009204965A - Imaging apparatus and optical equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique capable of reducing space of a finder optical system. <P>SOLUTION: The imaging apparatus 1A is equipped with an optical path changing part 90A in the finder optical system 102A. The optical path changing part 90A includes: a polarizing beam splitter 92 arranged at a crossing position KP between an incident optical path PA1 and an emitting optical path PA3 of subject light, transmitting light of P polarized light component out of the subject light made incident from the incident optical path PA1 as transmitted light and reflecting light of S polarized light component out of the subject light as reflected light; a roof prism 95 arranged in a course of the reflected light and reflecting the reflected light toward the polarizing beam splitter 92; and a 1/4 wavelength plate 94 arranged between the polarizing beam splitter 92 and the roof prism 95 and converting the reflected light into the light of P polarized light component. The reflected light converted into the light of P polarized light component is transmitted through the polarizing beam splitter 92 and emitted from the optical path changing part 90A as emitted light passing through the emitting optical path. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an optical apparatus such as an imaging apparatus.

  In a single-lens reflex type camera (also referred to as a “single-lens reflex camera”) that is one of optical devices, a user can visually recognize a subject image acquired by a photographing optical system via an optical viewfinder.

  For example, in a single-lens reflex camera described in Patent Document 1, a subject image that has passed through a photographing optical system is guided to a penta roof prism in a finder optical system via a mirror.

  In the penta roof prism, the subject image is converted from an inverted image to an erect image by reflection on one side surface (the roof reflecting surface) of the penta roof prism. The traveling direction of the subject light is changed by reflection on the other side surface of the penta roof prism, and the subject light is emitted from the penta roof prism toward the eyepiece.

  The subject image that has passed through the penta roof prism is guided to the finder window by the eyepiece, and is visible to the user looking through the finder window.

Japanese Patent Laid-Open No. 7-244317

  However, in the technique described in Patent Document 1, since the series of reflections performed by the penta roof prism is performed at a position that does not affect the path of the subject light emitted from the penta roof prism, the penta roof prism becomes large and eventually The space of the finder optical system becomes large.

  Therefore, an object of the present invention is to provide a technique capable of reducing the space of a finder optical system.

  According to a first aspect of the present invention, there is provided an imaging apparatus having a finder optical system through which subject light is guided, the finder optical system changing the traveling direction of the subject light incident from the first optical path, and the subject An optical path changing unit that emits light from the second optical path as outgoing light, and the optical path changing unit is disposed at an intersection of the first optical path and the second optical path and is incident on the subject from the first optical path A light beam of the first polarization component of the light is transmitted as transmitted light, and a polarization beam splitter that reflects the light of the second polarization component of the subject light as reflected light, and disposed in the path of the reflected light. Reflecting means for reflecting light toward the polarizing beam splitter, and a polarization component that is disposed between the polarizing beam splitter and the reflecting means and converts the reflected light into light of the first polarization component. The reflected light converted into the light of the first polarization component is transmitted from the polarization beam splitter and emitted from the optical path changing means as the emitted light passing through the second optical path. It is characterized by that.

  A second aspect of the present invention is an imaging apparatus having a finder optical system through which subject light is guided, the finder optical system changing the traveling direction of the subject light incident from the first optical path, and the subject An optical path changing unit that emits light from the second optical path as outgoing light, and the optical path changing unit is disposed at an intersection of the first optical path and the second optical path and is incident on the subject from the first optical path The light of the first polarization component of the light is transmitted as transmitted light, and the polarization beam splitter that reflects the light of the second polarization component of the subject light as reflected light, and disposed in the path of the transmitted light. Reflecting means for reflecting light toward the polarizing beam splitter, and a polarization component that is disposed between the polarizing beam splitter and the reflecting means and converts the transmitted light into light of the second polarization component. The transmitted light converted into the light of the second polarization component is reflected by the polarization beam splitter and emitted from the optical path changing means as the emitted light passing through the second optical path. It is characterized by.

  According to a third aspect of the present invention, there is provided an optical apparatus having a finder optical system through which predetermined light is guided, wherein the finder optical system changes the traveling direction of the predetermined light incident from a first optical path, and An optical path changing unit that emits light from the second optical path as outgoing light is provided, and the optical path changing unit is disposed at an intersection between the first optical path and the second optical path, and is incident on the first optical path. A polarizing beam splitter that transmits light of the first polarization component of the light as transmitted light and reflects light of the second polarization component of the predetermined light as reflected light, and is disposed in the path of the reflected light, and reflects the reflection. Reflecting means for reflecting light toward the polarizing beam splitter, and a polarization component converting means arranged between the polarizing beam splitter and the reflecting means for converting the reflected light into light of the first polarization component And the reflected light converted into the light of the first polarization component passes through the polarization beam splitter and is emitted from the optical path changing means as the emitted light passing through the second optical path. And

  According to a fourth aspect of the present invention, there is provided an optical apparatus having a finder optical system through which predetermined light is guided, wherein the finder optical system changes the traveling direction of the predetermined light incident from the first optical path, and An optical path changing unit that emits light from the second optical path as outgoing light is provided, and the optical path changing unit is disposed at an intersection between the first optical path and the second optical path, and is incident on the first optical path. A first polarization component of the light is transmitted as transmitted light, and the second polarization component of the predetermined light is reflected as reflected light. The polarization beam splitter is disposed in the path of the transmitted light, and transmits the transmitted light. Reflecting means for reversing the traveling direction of light and reflecting the transmitted light, and a polarization component conversion disposed between the polarizing beam splitter and the reflecting means for converting the transmitted light into light of the second polarization component means And the transmitted light converted into the light of the second polarization component is reflected by the polarization beam splitter and emitted from the optical path changing means as the emitted light passing through the second optical path. To do.

  According to the present invention, it is possible to change the optical path of the subject light by arranging the polarization beam splitter on the optical path of the subject light emitted from the optical path changing unit, so that the space of the finder optical system can be reduced. become.

  Embodiments of the present invention will be described below with reference to the drawings.

<1. First Embodiment>
<External Configuration of Imaging Device 1A>
1 and 2 are diagrams showing an external configuration of an imaging apparatus 1A according to the first embodiment of the present invention. Here, FIGS. 1 and 2 show a front view and a rear view, respectively.

  The imaging apparatus 1 </ b> A is configured as, for example, a single-lens reflex digital still camera, and includes a camera body 10 and a photographing lens unit 2 as an interchangeable lens that is detachable from the camera body 10.

  Specifically, as shown in FIG. 1, on the front side of the camera body 10, a mount portion 301 on which the photographing lens unit 2 is mounted at the front center and a lens disposed on the right side of the mount portion 301. An exchange button 302, a grip portion 303 for enabling gripping, a mode setting dial 305 disposed at the upper left portion of the front surface, a control value setting dial 306 disposed at the upper right portion of the front surface, and an upper surface of the grip portion 303 A shutter button (release button) 307 is provided.

  The photographing lens unit 2 functions as a lens window that captures light from the subject (subject light), and also functions as a photographing optical system for guiding the subject light to the image sensor 101 disposed inside the camera body 10. .

  More specifically, the photographing lens unit 2 includes a lens group 21 including a plurality of lenses arranged in series along the optical axis LT (see FIG. 5). The lens group 21 includes a focus lens 211 (FIG. 5) for adjusting the focus and a zoom lens 212 (FIG. 5) for zooming, and each is driven in the direction of the optical axis LT. As a result, focus adjustment or zooming is performed. The photographing lens unit 2 is provided with an operation ring that can rotate along the outer peripheral surface of the lens barrel at a suitable position on the outer periphery of the lens barrel. The zoom lens 212 can be operated manually or automatically. It moves in the direction of the optical axis LT according to the rotation direction and rotation amount of the operation ring, and is set to a zoom magnification (imaging magnification) according to the position of the movement destination.

  The mount 301 is provided with a connector Ec (see FIG. 5) for electrical connection with the mounted photographic lens unit 2 and a coupler 75 (FIG. 5) for mechanical connection.

  The lens exchange button 302 is a button that is pressed when the photographing lens unit 2 attached to the mount unit 301 is removed.

  The grip portion 303 is a portion where the photographer (user) holds the imaging device 1A during photographing, and the surface of the grip portion 303 is provided with unevenness according to the shape of the finger in order to improve fitting properties. Note that a battery storage chamber and a card storage chamber (not shown) are provided inside the grip portion 303. A battery 69B (see FIG. 5) is housed in the battery compartment as a power source for the image pickup apparatus 1A, and a memory card 67 (FIG. 5) for recording image data of a photographed image is detachable in the card compartment. It is designed to be stored. The grip unit 303 may be provided with a grip sensor for detecting whether or not the user has gripped the grip unit 303.

  The mode setting dial 305 and the control value setting dial 306 are made of a substantially disk-shaped member that can rotate in a plane substantially parallel to the upper surface of the camera body 10. The mode setting dial 305 is used for various modes (such as various shooting modes (portrait shooting mode, landscape shooting mode, full-auto shooting mode, etc.), a playback mode for playing back a shot image, and an external device. This is for selecting a communication mode for performing data communication. On the other hand, the control value setting dial 306 is for setting control values for various functions installed in the imaging apparatus 1A.

  The shutter button 307 is a push switch that can detect a “half-pressed state” that is pressed halfway and a “full-pressed state” that is further pressed. When the shutter button 307 is half-pressed (S1) in the shooting mode, a preparatory operation (preparation operation for setting an exposure control value, focus detection, etc.) for photographing a still image of the subject is executed, and the shutter button 307 is fully pressed. When pressed (S2), a shooting operation (a series of operations for exposing the image sensor 101 (see FIG. 4), performing predetermined image processing on the image signal obtained by the exposure, and recording the image signal in the memory card 67 or the like) Is executed.

  As shown in FIG. 2, an LCD (Liquid Crystal Display) 311 that functions as a display unit, a finder window 316 disposed above the LCD 311, and a finder window 316 are provided on the back side of the camera body 10. The surrounding eyecup 321, the main switch 317 disposed on the left side of the finder window 316, the exposure correction button 323 and the AE lock button 324 disposed on the right side of the finder window 316, and the finder window 316 A flash unit 318 and a connection terminal unit 319 disposed above are provided. On the back side of the camera body 10, a setting button group 312 disposed on the left side of the LCD 311, a direction selection key 314 disposed on the right side of the LCD 311, and a push disposed on the center of the direction selection key 314. A button 315 and a display changeover switch 85 arranged at the lower right of the direction selection key 314 are provided.

  The LCD 311 includes a color liquid crystal panel capable of displaying an image, and displays an image captured by the image sensor 101 (see FIG. 3) or reproduces and displays a recorded image, and is mounted on the image capturing apparatus 1A. Function or mode setting screen. Note that an organic EL display device or a plasma display device may be used instead of the LCD 311.

  The viewfinder window (eyepiece window) 316 constitutes an optical viewfinder (OVF), and light (subject light) that forms a subject image that has passed through the photographing lens unit 2 is guided to the viewfinder window 316. The user can view the subject image actually captured by the image sensor 101 by looking through the finder window 316.

  The main switch 317 is a two-contact slide switch that slides to the left and right. When the switch is set to the left, the power of the image pickup apparatus 1A is turned on, and when the switch is set to the right, the power is turned off.

  The flash unit 318 is configured as a pop-up built-in flash. On the other hand, when attaching an external flash or the like to the camera body 10, the connection is made using the connection terminal portion 319.

  The eye cup 321 functions as a light shielding member that suppresses intrusion of external light into the finder window 316.

  The exposure correction button 323 is a button for manually adjusting the exposure value (aperture value and shutter speed), and the AE lock button 324 is a button for fixing the exposure.

  The setting button group 312 is a button for performing operations on various functions installed in the imaging apparatus 1A. The setting button group 312 includes, for example, a menu button for displaying a menu screen on the LCD 311 and a menu switching button for switching the contents of the menu screen.

  The direction selection key 314 has an annular member having a plurality of pressing portions (triangle marks in the drawing) arranged at regular intervals in the circumferential direction, and is not shown provided corresponding to each pressing portion. The pressing operation of the pressing portion is detected by the contact (switch). The push button 315 is disposed at the center of the direction selection key 314. The direction selection key 314 and the push button 315 are used to change the shooting magnification (movement of the zoom lens 212 (see FIG. 5) in the wide direction or the tele direction), frame advance of a recorded image to be reproduced on the LCD 311 and the like, and shooting conditions (aperture). Value, shutter speed, presence / absence of flash emission, etc.).

  The display changeover switch 85 is composed of two slide switches. When the contact point is set at the upper “optical” position, the optical finder mode (also referred to as “OVF mode”) is selected, and the subject image is displayed in the optical finder field of view. The Accordingly, the user can visually recognize a subject image displayed in the optical viewfinder field through the viewfinder window 316 and perform a composition determination operation (framing).

  On the other hand, when the contact of the display changeover switch 85 is set to the lower “monitor” position, the electronic finder mode (also referred to as “EVF mode” or “live view mode”) is selected, and the live view image related to the subject image is displayed on the LCD 311 as a moving image. Displayed in a specific manner. Thereby, the user can perform framing by visually recognizing the live view image displayed on the LCD 311.

  As described above, the user can switch the finder mode by operating the display changeover switch 85, and the imaging apparatus 1A determines the composition of the subject using the electronic finder or the optical finder on which the live view display is performed. Is possible.

<Internal Configuration of Imaging Device 1A>
Next, the internal configuration of the imaging apparatus 1A will be described. 3 and 4 are longitudinal sectional views of the imaging apparatus 1A. As shown in FIG. 3, an image sensor 101, a finder unit (also referred to as “finder optical system”) 102 </ b> A, a mirror mechanism 8, and a phase difference AF module (also simply referred to as “AF module”) 107 are provided inside the camera body 10. Etc. are provided.

  The imaging element 101 is arranged perpendicular to the optical axis LT on the optical axis LT of the photographing lens unit 2 when the photographing lens unit 2 is mounted on the camera body 10. As the image sensor 101, for example, a CMOS color area sensor (CMOS type image sensor) in which a plurality of pixels configured with photodiodes are two-dimensionally arranged in a matrix is used. The image sensor 101 generates analog electrical signals (image signals) of R (red), G (green), and B (blue) color components related to the subject image formed through the photographing lens unit 2, and R, Output as image signals of G and B colors.

  A shutter unit 40 is disposed on the imaging surface side of the imaging element 101. The shutter unit 40 includes a curtain body that moves in the vertical direction, and is configured as a mechanical focal plane shutter that performs an optical path opening operation and an optical path blocking operation of subject light guided to the image sensor 101 along the optical axis LT. The shutter unit 40 can be omitted when the image sensor 101 is an image sensor capable of complete electronic shutter.

  As shown in FIG. 3, a mirror mechanism 8 is provided on the optical path (also referred to as “imaging optical path”) from the imaging lens unit 2 to the image sensor 101.

  The mirror mechanism 8 has a main mirror 81 (main reflection surface) that reflects light from the photographing optical system upward. For example, a part or all of the main mirror 81 is configured as a half mirror, and transmits a part of light from the photographing optical system. The mirror mechanism 8 also includes a sub mirror 82 (sub reflective surface) that reflects light transmitted through the main mirror 81 downward.

  Until the shutter button 307 is fully pressed S2 in the photographing mode, in other words, when determining the composition, the mirror mechanism 8 is arranged so as to be in the mirror down state (see FIG. 3). In the mirror-down state, the subject light from the photographic lens unit 2 is reflected upward by the main mirror 81, enters the finder optical system 102A as an observation light beam, and is guided to the finder window 316 (see FIG. 2). The finder optical system 102A will be described later.

  A part of the subject light is transmitted through the main mirror 81, reflected downward by the sub mirror 82, and guided to the AF module 107.

  The AF module 107 is configured by a line sensor or the like that detects focus information of a subject, and functions as a so-called AF sensor. The AF module 107 is disposed at the bottom of the mirror mechanism 8 and has a phase difference detection function for generating a phase difference detection signal corresponding to the degree of focus of the subject image. That is, in the mirror-down state at the time of shooting standby, the phase difference detection signal is output from the AF module 107 based on the subject light guided to the AF module 107.

  On the other hand, when the shutter button 307 is fully pressed S2, the mirror mechanism 8 is driven so as to be in the mirror up state (see FIG. 4), and the exposure operation is started.

  Specifically, as shown in FIG. 4, at the time of exposure, the mirror mechanism 8 jumps upward with the rotating shaft 83 as a fulcrum and retracts from the photographing optical path. Specifically, the main mirror 81 and the sub mirror 82 are retracted upward so as not to block the light from the photographing optical system, and the light from the photographing lens unit 2 reaches the image sensor 101 in accordance with the opening timing of the shutter unit 40. To do. The image sensor 101 generates an image signal related to the subject image based on the received light flux by photoelectric conversion. As described above, the light from the subject is guided to the image sensor 101 via the photographing lens unit 2, so that a photographed image (photographed image data) relating to the subject is obtained.

<Electrical Configuration of Imaging Device 1A>
FIG. 5 is a block diagram illustrating an electrical configuration of the imaging apparatus 1A. Here, the same members and the like as those in FIGS. 1 to 4 are denoted by the same reference numerals. For convenience of explanation, the electrical configuration of the photographic lens unit 2 will be described first.

  The photographic lens unit 2 includes a lens driving mechanism 24, a lens position detection unit 25, a lens control unit 26, and an aperture driving mechanism 27 in addition to the lens group 21 constituting the above-described photographic optical system.

  In the lens group 21, a focus lens 211 and a zoom lens 212, and a diaphragm 23 for adjusting the amount of light incident on the image sensor 101 are held in the optical axis LT direction in the lens barrel. The captured subject light is imaged on the image sensor 101. In the automatic focusing (AF) control, the focus lens 211 is driven in the direction of the optical axis LT by the AF actuator 71M in the photographing lens unit 2 to perform focus adjustment.

  The focus drive control unit 71A generates a drive control signal necessary for moving the focus lens 211 to the in-focus position based on the AF control signal given from the overall control unit 62 via the lens control unit 26, and the drive The AF actuator 71M is controlled using the control signal. The AF actuator 71M is composed of a stepping motor or the like, and applies a lens driving force to the lens driving mechanism 24.

  The lens driving mechanism 24 includes, for example, a helicoid and a gear (not shown) that rotates the helicoid, and receives the driving force from the AF actuator 71M to drive the focus lens 211 and the like in a direction parallel to the optical axis LT. It is. The moving direction and moving amount of the focus lens 211 are in accordance with the rotating direction and the rotating speed of the AF actuator 71M, respectively.

  The lens position detection unit 25 moves integrally with the lens while being in sliding contact with the encode plate in which a plurality of code patterns are formed at a predetermined pitch in the optical axis LT direction within the movement range of the lens group 21. An encoder brush, and detects the amount of movement of the lens group 21 during focus adjustment. The lens position detected by the lens position detection unit 25 is output as the number of pulses, for example.

  The lens control unit 26 is composed of, for example, a microcomputer having a built-in memory such as a ROM that stores a control program or a flash memory that stores data relating to status information.

  The lens control unit 26 has a communication function for communicating with the overall control unit 62 of the camera body 10 via the connector Ec. Thereby, for example, the state information data such as the focal length, the aperture value, the focusing distance or the peripheral light amount state of the lens group 21 and the position information of the focus lens 211 detected by the lens position detection unit 25 are transmitted to the overall control unit 62. In addition, the driving amount data of the focus lens 211 can be received from the overall control unit 62, for example.

  The aperture drive mechanism 27 receives the driving force from the aperture drive actuator 76M via the coupler 75 and changes the aperture diameter of the aperture 23.

  Next, the electrical configuration of the camera body 10 will be described. The camera body 10 includes an AFE (analog front end) 5, an image processing unit 61, an image memory 614, an overall control unit 62, a flash circuit 63, an operation unit 64, and a VRAM 65 in addition to the above-described imaging device 101 and shutter unit 40. Card I / F 66, memory card 67, communication I / F 68, power supply circuit 69, battery 69B, mirror drive control unit 72A, shutter drive control unit 73A, and aperture drive control unit 76A.

  The image sensor 101 is composed of a CMOS color area sensor as described above, and the timing control circuit 51 described below starts (and ends) the exposure operation of the image sensor 101, selects the output of each pixel included in the image sensor 101, In addition, an imaging operation such as readout of pixel signals is controlled.

  The AFE 5 gives a timing pulse for causing the image sensor 101 to perform a predetermined operation, performs predetermined signal processing on the image signal output from the image sensor 101, converts the image signal to a digital signal, and outputs the digital signal to the image processing unit 61. It has a function to do. The AFE 5 includes a timing control circuit 51, a signal processing unit 52, an A / D conversion unit 53, and the like.

  The timing control circuit 51 generates a predetermined timing pulse (a pulse for generating a vertical scanning pulse φVn, a horizontal scanning pulse φVm, a reset signal φVr, and the like) based on the reference clock output from the overall control unit 62, and the imaging device 101. And the imaging operation of the image sensor 101 is controlled. In addition, the operation of the signal processing unit 52 and the A / D conversion unit 53 is controlled by outputting predetermined timing pulses to the signal processing unit 52 and the A / D conversion unit 53, respectively.

  The signal processing unit 52 performs predetermined analog signal processing on the analog image signal output from the image sensor 101. The signal processing unit 52 includes a CDS (correlated double sampling) circuit, an AGC (auto gain control) circuit, a clamp circuit, and the like. The A / D conversion unit 53 converts the analog R, G, B image signals output from the signal processing unit 52 into a plurality of bits (for example, 12 bits) based on the timing pulse output from the timing control circuit 51. Is converted into a digital image signal.

  The image processing unit 61 performs predetermined signal processing on the image data output from the AFE 5 to create an image file, and includes a black level correction circuit 611, a white balance control circuit 612, a gamma correction circuit 613, and the like. Has been. The image data captured by the image processing unit 61 is temporarily written in the image memory 614 in synchronization with the reading of the image sensor 101. Thereafter, the image data written in the image memory 614 is accessed to access the image processing unit. Processing is performed in each of the 61 blocks.

  The black level correction circuit 611 corrects the black level of each of the R, G, and B digital image signals A / D converted by the A / D conversion unit 53 to a reference black level.

  The white balance control circuit 612 performs level conversion (white balance (WB) adjustment) of digital signals of R (red), G (green), and B (blue) color components based on the white reference corresponding to the light source. . Specifically, the white balance control circuit 612 identifies a portion that is originally estimated to be white in the photographic subject from the luminance or saturation data based on the WB adjustment data provided from the overall control unit 62, and the portion. The R, G, and B color components are averaged, and the G / R ratio and G / B ratio are obtained, and the levels are corrected as R and B correction gains.

  The gamma correction circuit 613 corrects the gradation characteristics of the image data subjected to WB adjustment. Specifically, the gamma correction circuit 613 performs non-linear conversion of the image data level for each color component and offset adjustment using a preset gamma correction table.

  The image memory 614 temporarily stores the image data output from the image processing unit 61 in the shooting mode and is used as a work area for performing predetermined processing on the image data by the overall control unit 62. It is. In the playback mode, the image data read from the memory card 67 is temporarily stored.

  The overall control unit 62 is configured as a microcomputer and mainly includes a CPU, a RAM 621, a ROM 622, and the like. The overall control unit 62 reads out a program stored in the ROM 622 and executes the program by the CPU, thereby realizing various functions of the imaging apparatus 1A.

  For example, based on the phase difference detection signal acquired by the AF module 107, the overall control unit 62 performs a focus lens position specifying operation for specifying the position of the focus lens at the time of focusing (focus lens position).

  The flash circuit 63 controls the light emission amount of the external flash connected to the flash unit 318 or the connection terminal unit 319 to the light emission amount set by the overall control unit 62 in the flash photographing mode.

  The operation unit 64 includes the mode setting dial 305, the control value setting dial 306, the shutter button 307, the setting button group 312, the direction selection key 314, the push button 315, the main switch 317, and the like. 62 for input.

  The VRAM 65 has an image signal storage capacity corresponding to the number of pixels of the LCD 311 and is a buffer memory between the overall control unit 62 and the LCD 311. The card I / F 66 is an interface for enabling transmission / reception of signals between the memory card 67 and the overall control unit 62. The memory card 67 is a recording medium that stores image data generated by the overall control unit 62. The communication I / F 68 is an interface for enabling transmission of image data and the like to a personal computer or other external device.

  The power supply circuit 69 includes a constant voltage circuit, for example, and generates a voltage for driving the entire imaging apparatus 1A, such as a control unit such as the overall control unit 62, the imaging element 101, and other various driving units. Note that energization control to the image sensor 101 is performed by a control signal supplied from the overall control unit 62 to the power supply circuit 69. The battery 69B includes a primary battery such as an alkaline battery or a secondary battery such as a nickel metal hydride battery, and is a power source that supplies power to the entire imaging apparatus 1A.

  The mirror drive control unit 72A generates a drive signal for driving the mirror drive actuator 72M in accordance with the switching of the finder mode or the timing of the photographing operation. The mirror drive actuator 72M is an actuator that rotates the mirror mechanism 8 (quick return mirror) to a horizontal posture or an inclined posture.

  The shutter drive control unit 73A generates a drive control signal for the shutter drive actuator 73M based on a control signal given from the overall control unit 62. The shutter drive actuator 73M is an actuator that opens and closes the shutter unit 40.

  The aperture drive control unit 76A generates a drive control signal for the aperture drive actuator 76M based on the control signal given from the overall control unit 62. The aperture driving actuator 76M applies a driving force to the aperture driving mechanism 27 via the coupler 75.

<About the finder optical system>
Next, the finder optical system 102A mounted on the imaging apparatus 1A will be described in detail. FIG. 6 is an enlarged view of the finder optical system 102A. 7 is a cross-sectional view taken along the VII-VII cross section of FIG.

  As shown in FIG. 6, the finder optical system 102 </ b> A includes an optical path changing unit 90 </ b> A and an eyepiece lens 96.

  The eyepiece 96 guides the subject image emitted from the optical path changing unit 90A to the outside of the finder window 316.

  The optical path changing unit 90A has an optical path changing function for changing the traveling direction of the subject light incident on the optical path changing unit 90A, and includes a polarization beam splitter 92, a roof prism 95, and a quarter wavelength plate 94. Yes.

  The polarization beam splitter 92 is a cubic prism having a broadband polarizing film 93 and has a function of separating incident light according to its polarization component. Specifically, the polarization beam splitter 92 allows the broadband polarizing film 93 to transmit the P-polarized light component (P-polarized light) in the incident light and reflect the S-polarized light component (S-polarized light) in the incident light.

  The roof prism 95 is a prism having a roof-shaped reflection surface (also referred to as “roof surface” or “roof reflection surface”) 95D (see FIG. 7). The roof prism 95 has a function of reversing the posture of the subject image by reflecting the subject light twice on the roof surface 95D (see FIG. 7).

  A quarter-wave plate (also simply referred to as “wave plate”) 94 has a phase difference of ¼ wavelength (π / 2) to light passing through the quarter-wave plate 94 (which is faster on the exit surface of the wave plate). A component having a polarization component conversion function of converting a polarization component of light is provided. For example, when S-polarized component light is incident on the wave plate 94, the wave plate 94 converts the incident S-polarized light into clockwise (or counterclockwise) circularly polarized light (circularly polarized light). Further, when clockwise (or counterclockwise) circularly polarized light is incident on the wave plate 94, the wave plate 94 converts the incident clockwise (or counterclockwise) circularly polarized light into P-polarized light.

  As shown in FIG. 3, the optical path changing unit 90A having the above-described members changes the optical path of subject light (also referred to as “finder optical path”) PA in the finder optical system 102A. Specifically, the optical path changing unit 90A has an optical path changing function for changing the traveling direction of the subject light incident through the incident optical path PA1 and emitting the subject light through the outgoing optical path PA3. The optical path is changed so that the intersection angle between the incident optical path PA1 and the outgoing optical path PA3 is a right angle (90 °).

  Hereinafter, a specific configuration of the optical path changing unit 90A having such an optical path changing function will be described.

  In the optical path changing unit 90A, a polarization beam splitter 92 is disposed on the incident optical path PA1 of the subject light reflected by the main mirror 81. Specifically, the polarizing beam splitter 92 is arranged so that the angle between the incident light to the polarizing beam splitter 92 and the reflected light (here, S-polarized light) from the broadband polarizing film 93 is 90 °. In other words, the polarization beam splitter 92 is arranged so that the incident angle of the incident light to the broadband polarizing film 93 is 45 °. As a result, the incident optical path PA1 and the optical path of reflected light from the broadband polarizing film 93 (also referred to as “reflected optical path”) PA2 are perpendicular to each other.

  The polarization beam splitter 92 is arranged so that the plane angle between the plane including the broadband polarizing film 93 and the plane including the main mirror 81 in the mirror-down state is a right angle. By arranging the broadband polarizing film 93 and the main mirror 81 in such a positional relationship, the main mirror 81 and the broadband polarizing film 93 can invert the subject image vertically.

  Further, in the optical path changing unit 90A, the roof surface 95D of the roof prism 95 is arranged in the path of the reflected light (the destination of the reflected light). Specifically, the roof surface 95D is disposed so that the plane angle with the horizontal plane is a right angle on the reflected light path PA2. Thereby, the roof surface 95D is displaced in the Y direction between the optical path (reflection optical path) PA2 of the subject light reaching the roof surface 95D and the optical path (exit optical path) PA3 of the subject light reflected on the roof surface 95D. It is possible to reflect the subject light without causing the. That is, the subject light reflected by the broadband polarizing film 93 is reflected twice by the roof surface 95D and travels in the −Z direction on the outgoing light path PA3.

  The wave plate 94 is disposed between the polarization beam splitter 92 and the roof prism 95 on the finder optical path PA.

  In the optical path changing unit 90A having such a configuration, the traveling direction of the subject light can be bent by 90 ° and emitted to the eyepiece lens 96, and the subject image can be emitted from an inverted image to an erect image. Is possible.

  Here, the behavior of the subject light HL1 incident on the finder optical system 102A will be described in detail.

  Specifically, as shown in FIG. 6, it is assumed that the subject light HL1 reflected by the main mirror 81 enters the finder optical system 102A.

  In this case, the subject light HL1 which is natural light (non-polarized light) is first separated into S-polarized light and P-polarized light by the broadband polarizing film 93 in the polarizing beam splitter 92. The subject light HL1 of the P-polarized component in the subject light HL1 passes through the broadband polarizing film 93, and the subject light HL1 of the S-polarized component in the subject light HL1 is reflected by the broadband polarizing film 93.

  The reflected S-polarized component subject light HL1 is then used as an observation light beam. Specifically, the subject light HL1 travels in the + Z direction (specifically, in a direction opposite to the traveling direction of the outgoing light on the straight line including the outgoing light path PA3) and reaches the wave plate 94. The subject light HL 1 having the S polarization component is converted from S polarization to circular polarization by the wave plate 94 and enters the roof prism 95.

  The subject light HL1 having a circularly polarized component is reflected by the roof surface 95D of the roof prism 95, and its traveling direction is changed. Specifically, as shown in FIG. 7, the subject light HL1 incident on the roof prism 95 reaches the roof surface 95D and is reflected twice on the roof surface 95D. Due to the reflection on the roof surface 95D, the subject light HL1 having a circular polarization component changes its traveling direction from the + Z direction to the −Z direction, and reaches the wave plate 94 again. Note that the left and right sides of the subject image are reversed by the reflection on the roof surface 95D.

  The subject light HL 1 having a circularly polarized component is converted from circularly polarized light into P polarized light by the wave plate 94 and is incident on the polarization beam splitter 92. The P-polarized component subject light HL1 passes through the broadband polarizing film 93 and is emitted from the optical path changing unit 90A.

  The P-polarized subject light HL1 emitted from the optical path changing unit 90A is guided to the outside of the finder window 316 by the eyepiece lens 96, and is visible to the user.

  With the above-described configuration, the finder optical system 102A functions as an optical finder for confirming the object field during shooting standby before actual shooting.

<Contrast with comparative example>
Here, the imaging apparatus 1A in the present embodiment is compared with the imaging apparatus 1F in the following comparative example. FIG. 8 is a vertical cross-sectional view of an imaging apparatus 1F according to a comparative example. FIG. 9 is a longitudinal sectional view showing the optical path changing unit 90A and the penta roof prism 99 in an overlapping manner. In FIG. 9, the finder optical path PA in the present embodiment is indicated by a dotted line, and the finder optical path PB in the comparative example is indicated by a one-dot chain line. Further, portions where the finder optical paths PA and PB overlap in FIG. 9 are displayed with the optical paths shifted.

  As shown in FIG. 8, the imaging apparatus 1F includes a penta roof prism 99 and an eyepiece 96 as a finder optical system 102F. The difference from the imaging apparatus 1A according to the present embodiment is that the imaging apparatus 1F employs a penta roof prism 99 instead of the optical path changing unit 90A.

  In the imaging apparatus 1 </ b> F, the subject light incident on the finder optical system 102 </ b> F is reflected in this order on the roof side 99 </ b> D and one side 99 </ b> M of the penta roof prism 99 and guided to the eyepiece lens 96.

  When comparing the finder optical path PA of the present embodiment with the finder optical path PB of the comparative example, as shown in FIG. 9, the finder optical path PB of the comparative example is approximately equal to the linear optical path PB1 than the finder optical path PA of the present embodiment. become longer.

  This is because in the imaging apparatus 1A of the present embodiment, the reflecting surface can be disposed at a position KP where the incident optical path PA1 and the outgoing optical path PA3 intersect (also referred to as “intersection position” or “intersection point”). is there.

  Specifically, this will be described with reference to FIGS. FIG. 10 is a diagram in which a reflecting member 93R is arranged at the intersection position KP in a state parallel to the main mirror 81. FIG. 11 is a diagram in which the reflecting members 93R are arranged in the arrangement relationship according to the present embodiment.

  In the finder optical system 102A, the traveling direction of the subject light is bent by 90 ° and guided to the finder window 316. For example, as shown in FIG. 10, the reflecting member 93R intersects with the main mirror 81 in an intersecting position. The case where it arrange | positions to KP is assumed. In this case, the subject light is bent by 90 ° by one reflection on the reflecting member and guided to the finder window 316. From the finder window 316, an inverted image in which both the upper, lower, left and right sides of the subject are inverted is visually recognized. It will be.

  Therefore, in the finder optical systems 102A and 102F of the imaging apparatuses 1A and 1F, image replacement reflection (also referred to as “image reversal reflection”) is performed to convert (invert) the inverted image into an erect image so that the user can visually recognize the erect image. .

  For example, in the imaging apparatus 1F according to the comparative example (see FIG. 8), the incident subject light is once passed without being reflected at the intersection position KP, and image replacement reflection is performed on the roof side surface 99D. Then, the traveling direction is changed by reflection on one side surface 99M (also referred to as “optical path changing reflection”), and the subject light is converted to light along the outgoing optical path PB3 and returned to the intersection position KP.

  That is, in the imaging apparatus 1F, image replacement reflection is performed by bypassing the subject light starting from the intersection position KP. This detouring of the subject light has a configuration in which the reflection surface that performs the above-described series of reflections (specifically, image replacement reflection and optical path change reflection) is arranged at a position that does not affect the course of the subject light emitted from the penta roof prism. It is caused by.

  As described above, in the imaging device 1F according to the comparative example, since a series of reflections are performed by bypassing the subject light, the finder optical path PB becomes longer, the penta roof prism becomes larger, and the space of the finder optical system becomes larger. .

  In contrast, in the optical path changing unit 90A of the imaging apparatus 1A according to the present embodiment, as shown in FIG. 11, the reflecting member 93R (here, the broadband polarizing film 93) forms a roof type with the main mirror 81. Is arranged at the intersection position KP. Thereby, in the optical path changing unit 90A, the subject light is temporarily reflected by the main mirror 81 toward the roof surface 95D. In the optical path changing unit 90A having such a configuration, image replacement reflection is performed on the reflecting member 93R and the roof surface 95D. Further, the roof surface 95D is disposed so as to reflect the reached subject light toward the reflecting member 93R (here, the traveling direction of the reached subject light is reversed by reflection on the roof surface 95D). Therefore, the subject light reflected by the roof surface 95D returns directly to the reflecting member 93R without passing through another optical path. That is, in the optical path changing unit 90A of the image pickup apparatus 1A, image replacement reflection is performed without detouring subject light starting from the intersection position KP, and the subject light is returned to the intersection position KP.

  In the present embodiment, as the reflecting member 93R, the broadband polarizing film 93 that selectively performs the transmission function or the reflection function according to the polarization component of the light is adopted, so that the subject light that has undergone the image replacement reflection is reflected by the reflecting member. It is possible to transmit without reflecting at 93R. Specifically, a wave plate 94 is disposed in the optical path for image replacement reflection, and the subject light that has undergone image replacement reflection is reflected by converting the polarization component of the subject light into a polarization component that exhibits a transmission function. The light passes through the member 93R and is emitted from the optical path changing unit 90A.

  As described above, in the optical path changing unit 90A of the present embodiment, the reflecting member 93R can be disposed on the outgoing optical path PA3 (specifically, the intersection position KP), and thus the reflection surface that performs image replacement reflection from the intersection position KP. The path from the position (also referred to as “replacement reflection surface”) to the intersection position KP can be made substantially straight. That is, the length of the optical path for image replacement reflection can be minimized. According to such shortening of the finder optical path PA, the burden on the eyepiece lens 96 can be reduced.

  More specifically, as the distance from the imaging device 1A to the subject (shooting distance) increases, the size of the image formed by the lens decreases. Similarly, when the finder optical path PA increases, the eyepiece 96 forms. The image size is reduced. On the other hand, when the finder optical path PA is shortened as described above, the size of the subject image viewed from the finder window 316 increases. When the subject image becomes larger due to the shortening of the optical path in this way, a relatively large subject image can be visually recognized even by the eyepiece lens 96 having a low refractive index, so that the burden on the eyepiece lens 96 can be reduced and the lens design can be reduced. It becomes easy.

  Further, in the optical path changing unit 90A according to the present embodiment, the reflecting member 93R can be arranged on the outgoing optical path PA3 (specifically, the intersection position KP) to perform the optical path changing reflection and the image replacement reflection of the subject light. Therefore, the prism can be made small and the space of the finder optical system 102A can be reduced. That is, it is possible to reduce the weight and size of the imaging device 1A.

<2. Second Embodiment>
Next, a second embodiment of the present invention will be described. In the imaging apparatus 1A according to the first embodiment, among the subject light incident on the finder optical system 102A, the light of the S polarization component is used as the observation light beam. However, in the imaging apparatus 1B according to the second embodiment, P-polarized component light is used as an observation beam.

  The imaging device 1B according to the second embodiment has substantially the same configuration and functions (see FIGS. 1 to 5) as the imaging device 1A according to the first embodiment, except for the configuration of the finder optical system 102B. The common parts are denoted by the same reference numerals and the description thereof is omitted.

  Hereinafter, the finder optical system 102B of the imaging apparatus 1B will be described. FIG. 12 is an enlarged view of the finder optical system 102B.

  As described above, in the finder optical system 102B of the image pickup apparatus 1B, the P-polarized light component of the subject light incident on the finder optical system 102B is used as the observation light beam. Specifically, as shown in FIG. 12, in the finder optical system 102B, the quarter-wave plate 94 and the roof prism 95 are located on the opposite side of the broadband polarizing film 93 from the incident light incident side (broadband polarizing film 93). Are arranged in this order (on the other side through). With such a configuration, the P-polarized light component transmitted through the broadband polarizing film 93 in the incident light can be used as an observation light beam.

  Here, assuming that the subject light HL2 is incident on the finder optical system 102B, the behavior of the subject light HL2 in the finder optical system 102B will be described in detail.

  Specifically, as shown in FIG. 12, the subject light HL2 that is natural light (non-polarized light) is first separated into S-polarized light and P-polarized light by the broadband polarizing film 93 in the polarizing beam splitter 92. The subject light HL2 of the P-polarized component in the subject light HL2 passes through the broadband polarizing film 93 as transmitted light, while the subject light HL2 of the S-polarized component in the subject light HL2 is reflected by the broadband polarizing film 93. The

  The transmitted P-polarized component subject light HL2 is used as an observation light beam. Specifically, the subject light HL2 travels in the + Y direction and reaches the wave plate 94. The P-polarized component subject light HL 2 is converted from P-polarized light to circularly-polarized light by the wave plate 94 and enters the roof prism 95.

  The subject light HL2 having a circularly polarized component is reflected by a roof surface 95D (not shown in FIG. 12) of the roof prism 95 and reverses its traveling direction. Further, the left and right of the subject image are switched by the reflection on the roof surface 95D. The subject light HL2 whose traveling direction is changed from the + Y direction to the -Y direction due to the reflection of the roof surface 95D reaches the wave plate 94 again.

  Then, the circularly polarized component subject light HL 2 is converted from circularly polarized light to S polarized light by the wave plate 94 and is incident on the polarization beam splitter 92. Thereafter, the subject light HL2 of the S-polarized component is reflected by the broadband polarizing film 93. Due to the reflection, the subject light HL2 of the S-polarized component is emitted from the optical path changing unit 90B with its traveling direction being bent by 90 °.

  The S-polarized component subject light HL2 emitted from the optical path changing unit 90B is guided to the outside of the finder window 316 by the eyepiece lens 96 and becomes visible to the user.

  As described above, in the finder optical system 102B of the image pickup apparatus 1B according to the second embodiment, the wave plate 94 and the roof prism 95 are disposed above the polarization beam splitter 92, so that the subject light incident on the finder optical system 102A Of these, light of the P-polarized component is used as an observation light beam.

<3. Third Embodiment>
Next, a third embodiment of the present invention will be described. An imaging apparatus 1C according to the third embodiment includes a superimpose display unit 97 in the finder optical system 102C.

  The imaging apparatus 1C according to the third embodiment has substantially the same configuration and function (see FIGS. 1 to 5) as the imaging apparatus 1A according to the first embodiment except that the imaging apparatus 1C includes a superimpose display unit 97. The common parts are denoted by the same reference numerals and the description thereof is omitted.

  Hereinafter, the finder optical system 102C of the imaging apparatus 1C will be described. FIG. 13 is an enlarged view of the finder optical system 102C.

  As described above, the finder optical system 102C of the imaging apparatus 1C further includes the superimpose display unit 97.

  The superimpose display unit 97 includes a superimpose display element 971, a display reflection mirror 972, and a magnification adjustment lens 973, and has a function of displaying additional information (for example, an AF area) on a subject image viewed from the viewfinder window 316. have. Details of the additional information will be described later.

  Specifically, the superimpose display element 971 is configured by a liquid crystal display element, and additional information to be added to the subject image is displayed on the liquid crystal display element. Further, the output light (also referred to as “display light”) from the superimpose display element 971 is adjusted to the light of the S polarization component. Specifically, the display light from the liquid crystal display element is originally linearly polarized light, but when the linearly polarized light is P polarized light, it is converted to S polarized light by using a half-wave plate. If the display light is S-polarized light, the display light is used as it is.

  The display light of the S polarization component from the superimpose display element 971 reaches the magnification adjustment lens 973 via the display reflection mirror 972.

  The magnification adjustment lens 973 corrects the optical path difference from the finder optical path PA. Specifically, the magnification adjusting lens 973 includes the optical path of the subject light from the focusing screen 91 to the broadband polarizing film 93 again through the broadband polarizing film 93 and the roof prism 95, and the display reflection mirror from the superimpose display element 971. It has a function of correcting the difference from the optical path of the display light until it reaches the broadband polarizing film 93 via 972. By using such a magnification adjusting lens 973, the lengths of the two optical paths can be apparently made equal, so that the focus position of the subject image can be matched with the focus position of the image related to the additional information. become. That is, the magnification adjustment lens 973 can form a natural image in which additional information is superimposed on the subject image without a sense of incongruity.

  The S-polarized component display light that has passed through the magnification adjusting lens 973 enters the polarization beam splitter 92 and is reflected by the broadband polarizing film 93. Due to the reflection, the display light of the S-polarized component is emitted from the optical path changing unit 90A with its traveling direction being bent by 90 °.

  The display light of the S-polarized component emitted from the optical path changing unit 90A is guided to the outside of the finder window 316 by the eyepiece lens 96 and becomes visible to the user.

  As described above, since the imaging apparatus 1C according to the third embodiment includes the superimpose display unit 97 in the finder optical system 102C, the user can view an image obtained by superimposing additional information on the subject image in the optical finder field of view. It becomes possible to visually recognize inside.

  Note that a photometric element KK for measuring the amount of light of the subject image is disposed above the roof prism 95 in the finder optical system 102C. Photometric information from the photometric element KK is used to set an exposure (AE) control value.

  Here, the additional information will be described in detail. FIG. 14 is a diagram showing an AF area displayed as additional information. FIG. 15 is a diagram illustrating a grid composition index displayed as additional information, and FIG. 16 is a diagram illustrating a scale composition index displayed as additional information. FIG. 17 is a diagram illustrating a composite image of a subject image and an image displayed as additional information.

  In the imaging apparatus 1C, as additional information, for example, an AF area can be superimposed and displayed on a subject image in the optical finder field of view. Specifically, as shown in FIG. 14, the spot AF area SA and / or the local AF area RA can be displayed in the optical finder field of view HU. According to this, since the AF area can be adjusted to the main subject during framing, it is possible to acquire a focused captured image.

  Further, in the imaging apparatus 1C, as additional information, for example, as shown in FIG. 14, a spot photometry circle SK that is a photometry target region of the photometry element KK can be displayed. According to this, it becomes possible to perform framing in consideration of the spot photometry circle SK.

  Further, in the imaging apparatus 1C, for example, the upper and lower frames UD with an aspect ratio of 16: 9 shown in FIG. 14 can be displayed as additional information. According to this, it becomes possible to perform framing in consideration of the upper and lower frames UD.

  Further, in the imaging apparatus 1C, as additional information, for example, a grid composition index shown in FIG. 15 or a scale composition index shown in FIG. 16 can be displayed. By displaying either a grid composition index or a scale composition index, composition determination becomes easier.

  Further, in the imaging apparatus 1C, as additional information, for example, shooting information such as a shutter speed or an aperture value can be displayed. According to this, it is possible to check the shooting information without taking the eyes off the finder window 316.

  Since the superimpose display element 971 for displaying the additional information is a liquid crystal display element, if the additional information is difficult to see, the display color of the additional information can be freely changed.

  In addition, in the imaging apparatus 1C, as the additional information, the captured image PG recorded on the memory card 67 is displayed on the superimpose display element 971, thereby superimposing the subject image BI and the captured image PG within the optical finder field of view. Can be displayed. For example, as shown in FIG. 17, when the captured image PG is displayed on the superimpose display element 971, a composite image MG of the subject image BI and the captured image PG can be displayed in the optical finder field HU. it can.

  According to this, it becomes easy to shoot with the same framing as an image taken in the past, and multiple exposure shooting can be performed relatively easily.

  Note that the user can freely switch the additional information by, for example, a button operation using a display switching button included in the setting button group 312.

<4. Modification>
Although the embodiments of the present invention have been described above, the present invention is not limited to the contents described above.

  For example, in the optical path changing units 90A and 90B of each of the embodiments described above, the optical path of the subject light is changed internally so that the intersection angle between the incident optical path and the outgoing optical path is 90 °, but the present invention is not limited to this.

  Specifically, the intersection angle between the incident optical path PA1 and the outgoing optical path PA3 may be shifted from 90 °. FIG. 18 is a diagram illustrating a finder optical system 102D according to a modified example, and FIG. 19 is a diagram illustrating a finder optical system 102E according to the modified example.

  More specifically, as shown in FIG. 18, the polarization beam splitter 92 may be arranged so that the incident angle of the incident light to the broadband polarizing film 93 is less than 45 °. In addition, as shown in FIG. 19, the polarization beam splitter 92 may be arranged so that the incident angle of the incident light to the broadband polarizing film 93 exceeds 45 °. By changing the arrangement angle of the broadband polarizing film 93 in this way, the intersection angle between the incident optical path PA1 and the outgoing optical path PA3 can be shifted from 90 °.

  In the above embodiments, the roof surface 95D is reflected to reverse the traveling direction of the subject light incident on the roof surface 95D. However, the present invention is not limited to this.

  Specifically, the traveling direction of the subject light reflected on the roof surface 95D may be substantially opposite to the traveling direction of the subject light incident on the roof surface 95D, and the subject light traveling in the substantially opposite direction. Even so, the subject light is expressed as light traveling toward the polarization beam splitter 92.

  In each of the above embodiments, the finder optical systems 102A, 102B, and 102C are applied to the imaging devices 1A, 1B, and 1C. However, the finder optical systems 102A, 102B, and 102C are binoculars, projectors, or the like. The present invention can also be applied to other optical devices (optical devices).

1 is a front external view of an imaging apparatus according to a first embodiment. It is a back external view of an imaging device. It is a longitudinal cross-sectional view of an imaging device. It is a longitudinal cross-sectional view of an imaging device. It is a block diagram which shows the electrical structure of an imaging device. It is an enlarged view of a finder optical system. It is sectional drawing cut | disconnected by the VII-VII cross section of FIG. It is a longitudinal cross-sectional view of the imaging device which concerns on a comparative example. It is the longitudinal cross-sectional view on which the optical path change part and the penta roof prism were overlapped and represented. It is the figure which has arrange | positioned the reflection member in the crossing position in the state parallel to the main mirror. It is the figure which has arrange | positioned the reflection member by the arrangement | positioning relationship which concerns on this embodiment. It is an enlarged view of the finder optical system of the imaging device which concerns on 2nd Embodiment. It is an enlarged view of the finder optical system of the imaging device concerning a 3rd embodiment. It is a figure which shows AF area displayed as additional information. It is a figure which shows the grid composition parameter | index displayed as additional information. It is a figure which shows the scale composition parameter | index displayed as additional information. It is a figure which shows the composite image of a to-be-photographed image and the image displayed as additional information. It is a figure which shows the finder optical system which concerns on a modification. It is a figure which shows the finder optical system which concerns on a modification.

Explanation of symbols

1A, 1B, 1C, 1F Imaging devices 102A, 102B, 102C, 102D, 102E, 102F Viewfinder optical system 90A, 90B Optical path changing unit 92 Polarizing beam splitter 93 Broadband polarizing film 93R Reflecting member 94 1/4 wavelength plate 95 Dach prism 95D Dach Reflective surface 96 Eyepiece lens 316 Finder window 97 Superimpose display unit 971 Superimpose display element 972 Display reflection mirror 973 Magnification adjustment lens 99 Pentadaha prism HL1, HL2 Subject light KP Crossing position PA, PB Finder light path PA1 Incident light path PA2 Reflected light path PA3, PB3 Outgoing optical path PB finder optical path

Claims (9)

An imaging apparatus having a finder optical system through which subject light is guided,
The finder optical system includes an optical path changing unit that changes the traveling direction of the subject light incident from the first optical path and emits the subject light as the outgoing light from the second optical path,
The optical path changing means is
The first optical component is disposed at the intersection of the first optical path and the second optical path, and transmits the first polarization component of the subject light incident from the first optical path as transmitted light, and the first of the subject light. A polarizing beam splitter that reflects light of two polarization components as reflected light;
Reflecting means disposed in the path of the reflected light and reflecting the reflected light toward the polarizing beam splitter;
A polarization component converting means that is disposed between the polarizing beam splitter and the reflecting means, and converts the reflected light into light of the first polarization component;
Have
The reflected light converted into the light of the first polarization component passes through the polarization beam splitter and is emitted from the optical path changing unit as the emitted light passing through the second optical path. . The imaging device according to claim 1,
The imaging apparatus according to claim 1, wherein the reflection unit includes a roof reflection surface that reflects the subject image formed by the subject light by switching left and right. The imaging device according to claim 2,
The imaging apparatus according to claim 1, wherein the reflecting means reverses the traveling direction of the reflected light. The imaging device according to claim 3.
The finder optical system is
A display element that superimposes and displays additional information on the subject image;
Furthermore, the imaging device characterized by the above-mentioned. The imaging apparatus according to claim 4,
The display element is a liquid crystal display element,
The liquid crystal display element displays photographing information as the additional information. The imaging apparatus according to claim 5,
The liquid crystal display element displays a captured image as the additional information. An imaging apparatus having a finder optical system through which subject light is guided,
The finder optical system includes an optical path changing unit that changes the traveling direction of the subject light incident from the first optical path and emits the subject light as the outgoing light from the second optical path,
The optical path changing means is
The first optical component is disposed at the intersection of the first optical path and the second optical path, and transmits the first polarization component of the subject light incident from the first optical path as transmitted light, and the first of the subject light. A polarizing beam splitter that reflects light of two polarization components as reflected light;
Reflecting means disposed in the path of the transmitted light and reflecting the transmitted light toward the polarization beam splitter;
A polarization component converting means that is disposed between the polarizing beam splitter and the reflecting means and converts the transmitted light into light of the second polarization component;
Have
The transmitted light converted into the light of the second polarization component is reflected by the polarization beam splitter and emitted from the optical path changing unit as the emitted light passing through the second optical path. An optical apparatus having a finder optical system through which predetermined light is guided,
The finder optical system includes an optical path changing unit that changes the traveling direction of the predetermined light incident from the first optical path and emits the predetermined light from the second optical path as outgoing light,
The optical path changing means is
The first optical component is disposed at the intersection of the first optical path and the second optical path, and transmits the first polarization component of the predetermined light incident from the first optical path as transmitted light, and the first of the predetermined light. A polarizing beam splitter that reflects light of two polarization components as reflected light;
Reflecting means disposed in the path of the reflected light and reflecting the reflected light toward the polarizing beam splitter;
A polarization component converting means that is disposed between the polarizing beam splitter and the reflecting means, and converts the reflected light into light of the first polarization component;
Have
The reflected light converted into the light of the first polarization component passes through the polarization beam splitter and is emitted from the optical path changing means as the emitted light passing through the second optical path. . An optical apparatus having a finder optical system through which predetermined light is guided,
The finder optical system includes an optical path changing unit that changes the traveling direction of the predetermined light incident from the first optical path and emits the predetermined light from the second optical path as outgoing light,
The optical path changing means is
The first optical component is disposed at the intersection of the first optical path and the second optical path, and transmits the first polarization component of the predetermined light incident from the first optical path as transmitted light, and the first of the predetermined light. A polarizing beam splitter that reflects light of two polarization components as reflected light;
A reflecting means arranged in a path of the transmitted light, and reversing the traveling direction of the transmitted light to reflect the transmitted light;
A polarization component converting means that is disposed between the polarizing beam splitter and the reflecting means and converts the transmitted light into light of the second polarization component;
Have
The optical apparatus, wherein the transmitted light converted into the light of the second polarization component is reflected by the polarization beam splitter and is emitted from the optical path changing means as the emitted light passing through the second optical path.