JP6187571B2 - Imaging device - Google Patents

Description

  The present invention relates to an imaging apparatus and a posture adjustment program.

It has been proposed to adjust the attitude of the image sensor with reference to a focus detection signal output from a focus detection pixel included in the image sensor (see Patent Document 1).
[Prior art documents]
[Patent Literature]
[Patent Document 1] Japanese Unexamined Patent Application Publication No. 2009-141791

  However, it is not easy to change the tilt of the image sensor while measuring the focus detection signal.

  In order to solve the above problems, as a first aspect of the present invention, an image sensor, a focus detector that outputs a focus detection signal, and an attitude adjustment that adjusts the attitude of the image sensor based on the focus detection signal of the focus detector An imaging device is provided.

  According to a second aspect of the present invention, there is provided a posture adjustment program for adjusting the posture of an image sensor in an image pickup device including an image sensor and a focus detection unit that outputs a focus detection signal. An attitude adjustment program for executing a procedure for adjusting the attitude of the image sensor based on the focus detection signal of the focus detection unit is provided.

  The above summary of the present invention does not enumerate all necessary features of the present invention. A sub-combination of these feature groups can also be an invention.

1 is a cross-sectional view schematically showing the structure of a single-lens reflex camera 100. FIG. 4 is a side view of the image sensor unit 500. FIG. 2 is a front view of an image sensor unit 500. FIG. 3 is a schematic diagram of an image sensor 330. FIG. 2 is a block diagram schematically showing an internal circuit 600. FIG. FIG. 10 is a schematic diagram illustrating the operation of the image sensor unit 500. FIG. 10 is a schematic diagram illustrating the operation of the image sensor unit 500. FIG. 10 is a schematic diagram illustrating the operation of the image sensor unit 500. FIG. 10 is a schematic diagram illustrating the operation of the image sensor unit 500. 5 is a flowchart showing a control procedure of an attitude adjustment unit 650. An example of the processing procedure in step S102 is shown. An example of the processing procedure in step S103 is shown. An example of the processing procedure in step S104 and step S105 is shown. An example of the processing procedure in step S106 is shown. 5 is a flowchart showing a control procedure of an attitude adjustment unit 650. 5 is a flowchart showing a control procedure of an attitude adjustment unit 650. It is a figure which shows the structure of the image file which the single-lens reflex camera 100 produces | generates.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  FIG. 1 is a schematic cross-sectional view of a single-lens reflex camera 100. The single-lens reflex camera 100 is an imaging device and includes a lens unit 200 and a camera body 300.

  The lens unit 200 includes a fixed barrel 210, a plurality of lenses 220, 230, and 240, a lens mount 250, and a lens barrel main body CPU 260. One end of the fixed barrel 210 is coupled to the body mount 360 of the camera body 300 via the lens mount 250.

  The coupling between the lens mount 250 and the body mount 360 can be released by a specific operation. Accordingly, another lens unit 200 having the same standard lens mount 250 can be attached to the camera body 300.

  In the lens unit 200, the lens 220 located far from the camera body 300 is directly supported from the fixed barrel 210. In contrast, the other lenses 230 and 240 move in the direction of the optical axis OA with respect to the fixed cylinder 210. Thereby, the optical system of the lens unit 200 changes the focal length or the focal position.

  For example, the lens 230 is one of zoom lenses that move when the magnification of the lens unit 200 is changed. The lens 240 is one of focusing lenses that move when the focal position of the lens unit 200 is changed.

  The lens barrel main body CPU 260 controls the operation of the lens unit 200 and also communicates with the camera main body 300. Thus, when the lens unit 200 is attached to the camera body 300, the lens unit 200 operates in cooperation with the camera body 300.

  The camera body 300 includes a mirror unit 400 disposed behind the body mount 360 with respect to the lens unit 200. A focusing optical system 380 is disposed below the mirror unit 400. A focus plate 352 is disposed above the mirror unit 400.

  A pentaprism 354 is disposed further above the focusing plate 352, and a finder optical system 356 is disposed behind the pentaprism 354. The rear end of the viewfinder optical system 356 is exposed as a viewfinder 350 on the back surface of the camera body 300.

  Behind the mirror unit 400, a focal plane shutter 370 and an image sensor unit 500 are sequentially arranged. A main substrate 320 and a display unit 340 are sequentially arranged behind the image sensor unit 500. A main body CPU 322, an image processing unit 324, and the like are mounted on the main board 320. The display unit 340 is formed using, for example, a liquid crystal display panel and is exposed on the back surface of the camera body 300.

  The mirror unit 400 includes a main mirror 420 and a sub mirror 460. The main mirror 420 is supported by the main mirror holding frame 410. One end of the main mirror holding frame 410 is pivotally supported by the main mirror rotating shaft 430.

  The sub mirror 460 is held by the sub mirror holding frame 450. One end of the sub mirror holding frame 450 is pivotally supported from the main mirror holding frame 410 by a sub mirror rotating shaft 470. Therefore, the sub mirror 460 rotates with respect to the main mirror holding frame 410. When the main mirror holding frame 410 rotates, the sub mirror 460 and the sub mirror holding frame 450 also move together with the main mirror holding frame 410.

  When the front end of the main mirror holding frame 410 is lowered due to the rotation, the main mirror holding frame 410 comes into contact with the positioning pin 440 near the front end and stops. As a result, the main mirror 420 is tilted with respect to the subject light beam incident from the lens unit 200 and stops. Thus, the main mirror 420 is in an obliquely arranged state on the subject light beam incident from the lens unit 200.

  Further, when the front end of the main mirror holding frame 410 rises, the main mirror holding frame 410 comes into contact with the stopper 480 near the front end and stops. As a result, the main mirror 420 is retracted from the optical path of the subject light flux.

  In the oblique installation state, the main mirror 420 reflects the subject light beam incident through the lens unit 200 and guides it to the focus plate 352. The focus plate 352 is arranged at a position where the subject images are connected when the optical system of the lens unit 200 is focused, and visualizes the subject image.

  The subject image formed on the focus plate 352 is observed from the viewfinder 350 through the pentaprism 354 and the viewfinder optical system 356. When the luminous flux of the subject image passes through the pentaprism 354, the subject image on the focusing screen 352 can be observed as an erect image from the viewfinder 350.

  The photometric sensor 390 is disposed above the finder optical system 356 and receives a part of the subject light beam branched by the pentaprism 354. The photometric sensor 390 detects the brightness of the subject from a part of the received subject luminous flux. The main body CPU 322 calculates exposure conditions with reference to the photometric result of the photometric sensor 390. The photometric sensor 390 measures a part of the received subject light beam for each of the three primary colors. The main body CPU 322 improves the accuracy of the auto white balance process using the photometric results for each of the three primary colors.

  The main mirror 420 has a half mirror region that transmits a part of the incident subject light flux. The sub mirror 460 reflects a part of the subject light beam incident from the half mirror region toward the focusing optical system 380. The focusing optical system 380 guides a part of the incident subject light beam to the focus detection element 382. Thereby, the camera body 300 can determine the target position of the lens 230 that focuses the lens unit 200.

  Further, a posture detection unit 310 is disposed at the bottom of the camera body 300. The posture detection unit 310 is formed using an acceleration sensor, a gyro sensor, or the like, and detects what posture, that is, what inclination the camera body 300 has with respect to the direction in which gravity acts. To do.

  When the release button is half-pressed in the single-lens reflex camera 100 as described above, the focus detection element 382 and the photometric sensor 390 are enabled, and the subject image can be captured under appropriate shooting conditions. Next, when the release button is fully pressed, the main mirror 420 and the sub mirror 460 move to the retracted position, and the focal plane shutter 370 opens. Therefore, the subject luminous flux incident from the optical system of the lens unit 200 passes through the low-pass filter 332 and enters the image sensor unit 500. In the image sensor unit 500, a subject image is formed on the light receiving surface of the image sensor 330.

  The image sensor unit 500 includes an image sensor substrate 520 that supports the low-pass filter 332 and the image sensor 330, and a frame 510 that supports the image sensor substrate 520. The imaging element 330 is formed by a photoelectric conversion element such as a CCD sensor (Charge Coupled Device) or a CMOS sensor (Complementary Metal Oxide Semiconductor), and converts the subject image into an electrical signal. The imaging element substrate 520 translates or swings with respect to the frame 510, which will be described with reference to other drawings.

  FIG. 2 is a side view of the image sensor unit 500. FIG. 3 is a front view of the image sensor unit 500. Elements common to FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description is omitted.

  The image sensor unit 500 includes a frame 510, an image sensor substrate 520, and a plurality of actuators 531 to 536. The frame 510 has horizontal flange portions 512 at the upper end and the lower end in the drawing, and is fixed to the camera body 300.

  The image sensor substrate 520 has a plurality of spring seats 522 and a plurality of knife edges 524. The spring seats 522 sandwich the urging members 514 between the flange portions 512. The biasing member 514 is coupled to the flange portion 512 and the spring seat 522, respectively.

  Therefore, the urging member 514 maintains the state where the image sensor substrate 520 and the frame 510 are coupled even when the image sensor substrate 520 is displaced. When the actuators 531 to 536 do not drive the image sensor substrate 520, the biasing member 514 returns the image sensor substrate 520 to the original position.

  Each of the actuators 531 to 536 has a stepping motor 542 and a feed screw 544. The feed screw 544 is displaced in the longitudinal direction of the feed screw 544 itself according to the rotation of the stepping motor 542. Further, in each of the actuators 531 to 536, the leading end of the feed screw 544 is in contact with the image sensor substrate 520. Therefore, the image sensor substrate 520 can be translated or swung by controlling the stepping motor 542 individually.

  The actuators 531, 532, and 533 that contact the image sensor substrate 520 from the back side with respect to the image sensor 330 are provided with a conical spike 546 at the tip of the feed screw 544, and the image sensor substrate at the sharp tip of the spike 546. Abuts 520. Thereby, even when the angle of the feed screw 544 with respect to the image pickup device substrate 520 changes, the contact position of the feed screw 544 and the image pickup device substrate 520 does not change.

  In addition, the actuators 534, 535, and 536 that are in contact with the image sensor substrate 520 in the surface direction of the image sensor substrate 520 have a knife edge 548 orthogonal to the longitudinal direction of the feed screw 544 at the tip of the feed screw 544. The knife edge 548 contacts the knife edge 524 mounted on the side end of the image sensor substrate 520. Thereby, even when the angle of the feed screw 544 with respect to the image pickup device substrate 520 changes, the contact position of the feed screw 544 and the image pickup device substrate 520 does not change.

  FIG. 4 is a front view schematically showing the structure of the image sensor 330. The imaging element 330 includes a plurality of imaging pixels 334 that are two-dimensionally arranged on a rectangular light receiving surface 338. The imaging pixels 334 are arranged in a dense square lattice, a dense hexagonal lattice, or the like. Each of the imaging pixels 334 has a single photoelectric conversion region and a microlens stacked thereon.

  In addition, a plurality of focus detection pixels 336 are arranged on the light receiving surface 338 of the imaging element 330 in a mixed manner with the imaging pixels 334. Each of the focus detection pixels 336 includes a pair of photoelectric conversion regions and a microlens stacked on the surface thereof.

  A part of the focus detection pixels 336 are arranged along a horizontal straight line to form a plurality of focus detection regions 331, 333, and 335. Further, another part of the focus detection pixels 336 is arranged along a vertical straight line to form a plurality of focus detection regions 337 and 339. The pair of photoelectric conversion regions in the focus detection pixels 336 are arranged symmetrically in the focus detection regions 331, 333, and 335 in which the focus detection pixels 336 are horizontally arranged. Further, the focus detection areas 337 and 339 in which the focus detection pixels 336 are vertically arranged are arranged vertically symmetrically.

  The photoelectric conversion unit of the focus detection pixel 336 individually receives a pair of light beams that pass through the exit pupil of the photographing optical system by the microlens. That is, in each of the focus detection pixels 336, one photoelectric conversion unit receives a part of the light beam passing through the exit pupil and decentered to one side from the optical axis of the photographing optical system. The other photoelectric conversion unit receives a part of the light beam passing through the exit pupil that is decentered from the optical axis of the photographing optical system to the other.

  Thereby, a pair of distance measuring pupils is formed on the exit pupil of the photographing optical system. The exit pupil means an image formed by the focus detection pixels 336 arranged on the planned focal plane of the lens unit 200 at the distance measurement pupil distance of the microlens. The distance measuring pupil distance is uniquely determined according to the characteristics of the microlens. The distance measuring pupil is an image of the photoelectric conversion unit projected by the micro lens of the focus detection pixel 336.

  Based on the focus detection signal output from the photoelectric conversion unit of the focus detection pixel 336, the focus of the photographing optical system can be detected according to the pupil division phase difference detection method. That is, in each of the focus detection pixels 336, one photoelectric conversion unit receives a focus detection light beam that has passed through one distance measurement pupil, and the other photoelectric conversion unit receives a focus detection light beam that has passed through the other distance measurement pupil. To do.

  A plurality of focus detection pixels 336 are arranged on a straight line. Therefore, by collecting the focus detection pixel 336 outputs corresponding to each distance measurement pupil into a group, an intensity distribution of an image formed on the focus detection pixel array by the focus detection light flux passing through each distance measurement pupil can be obtained. An image shift amount is detected by performing image shift detection calculation processing such as correlation calculation processing or phase difference detection processing on the intensity distribution.

  When a conversion calculation corresponding to the center of gravity distance of the distance measurement pupil is performed on the obtained image shift amount, a deviation of the current focal plane with respect to the planned focal plane, that is, a defocus amount is obtained. Note that one of the plurality of focus detection areas 331, 333, 335, 337, and 339 can be selected and function, or a plurality of focus detection areas can be simultaneously functioned.

  As described above, the single-lens reflex camera 100 includes the focus detection areas 331, 333, 335, 337, and 339 in the image pickup device 330 in addition to the focus detection element 382. As a result, the lens unit 200 is aligned based on the focus detection signal output from the focus detection pixel 336 even in the live view mode in which the main mirror 420 is retracted and the through image acquired from the image sensor 330 is observed. Can be burnt.

  FIG. 4 is a schematic diagram, and many imaging elements 330 have imaging pixels 334 ranging from millions to tens of millions. The imaging pixel 334 forms one color pixel by the plurality of imaging pixels 334 by a primary color filter or a complementary color filter. However, in FIG. 4, the description about the color filter is omitted for the purpose of simplifying the drawing.

  On the other hand, the focus detection pixel 336 is not provided with a color filter. Therefore, the spectral characteristic of the focus detection pixel 336 is a combination of the spectral characteristic of a photodiode or the like that forms the photoelectric conversion unit and the spectral characteristic of the low-pass filter 332.

  Further, the shape of the photoelectric conversion unit in the focus detection pixel 336 is not necessarily a semicircular shape. The shape may be an ellipse, a rectangle, a polygon, or the like as long as the pair of photoelectric conversion units can be accommodated in the focus detection pixel 336.

  FIG. 5 is a block diagram schematically showing the internal circuit 600 of the single-lens reflex camera 100. The internal circuit 600 is formed by elements connected directly or indirectly to the main body CPU 322. Thus, the main body CPU 322 comprehensively controls the single-lens reflex camera 100 as a whole.

  A program memory 620 and a main memory 630 are connected to the main body CPU 322. The program memory 620 includes at least one of a nonvolatile recording medium and a read-only recording medium, and stores firmware and the like executed by the main body CPU 322. The main memory 630 includes a RAM and is used as a work area for the main body CPU 322.

  The main body CPU 322 also operates as a surveying calculation unit 612, a tilt angle giving unit 614, or a shift amount giving unit 616, depending on the read program. These functions will be described later with reference to other drawings.

  An attitude adjustment unit 650 is connected to the main body CPU 322. The posture adjustment unit 650 changes the posture of the image sensor 330 by individually operating the stepping motor 542 in the image sensor unit 500 under the control of the main body CPU 322.

  An imaging unit 660 is connected to the main body CPU 322. The image capturing unit 660 includes an image sensor 330, an image sensor drive unit 662, an analog / digital conversion unit 664, and an image processing unit 324. The image sensor 330 is driven by the image sensor drive unit 662 at a specific timing, photoelectrically converts the subject image, and outputs an image signal.

  The image signal output from the image sensor 330 is discretized by the analog / digital conversion unit 664 and converted into image data by the image processing unit 324. The image processing unit 324 adjusts image white balance, sharpness, gamma, gradation correction, compression, and the like in the process of generating image data.

  The image data generated by the image processing unit 324 is stored and stored in the secondary storage medium 670. As the secondary storage medium 670, a medium having a nonvolatile storage element such as a flash memory card is used. Note that at least a part of the secondary storage medium 670 can be detached from the camera body 300 and replaced.

  Further, the main body CPU 322 is connected with a focus detection element 382, a photometric sensor 390, and an attitude detection unit 310. The focus detection element 382 detects an in-focus position from the subject image formed by the optical system of the lens unit 200, and sends an instruction to the lens unit 200 to focus on the in-focus position. In this process, the focus detection element 382 acquires information having a correlation with the distance between the light receiving surface 338 and the subject.

  The photometric sensor 390 is disposed in a part of the optical path of the subject light flux in the camera body 300. The photometric sensor 390 receives a part of the subject luminous flux incident on the camera body 300 through the lens unit 200 and detects the subject luminance. Thus, the main body CPU 322 calculates the sensitivity of the image sensor 330, the shutter speed, the aperture opening degree, the presence / absence of auxiliary illumination, and the like, and sends an instruction to each part of the single-lens reflex camera 100.

  The posture detection unit 310 is formed by a gyro sensor or the like fixed to the camera body 300. The posture detection unit 310 detects the tilt angle and notifies the main body CPU 322 when the camera body 300 is tilted with respect to the direction of gravity.

  Furthermore, an input unit 680 and a display driving unit 690 are connected to the main body CPU 322. The input unit 680 accepts input from the operation unit 682 such as a release button, dial, cross key, and push button arranged mainly on the surface of the camera body 300, and holds input instructions, setting values, and the like. The main body CPU 322 determines operating conditions with reference to the input unit 680.

  The display driving unit 690 generates an image to be displayed on the display unit 340 and displays the image on the display unit 340. The display unit 340 displays the captured image read from the secondary storage medium 670 when the single-lens reflex camera 100 is operating in the playback mode. In addition, when the single-lens reflex camera 100 is operating in the shooting mode, the display unit 340 displays set shooting conditions such as shutter speed, aperture value, image sensor sensitivity, exposure correction, and the like.

  Furthermore, the display unit 340 displays a through image obtained from the image sensor 330 when the single-lens reflex camera 100 operates in the live view mode. In this case, the display unit 340 is used as a finder. Even in the live view mode, the shooting conditions may be displayed together with the through image or by dividing a partial area on the screen.

  Furthermore, the display unit 340 forms a mode selection unit for making various settings for the single-lens reflex camera 100 in cooperation with the operation unit 682 and the input unit 680. That is, in the mode selection unit, one of a plurality of options displayed on the display unit 340 is specified by operating the operation unit 682, and the input unit 680 holds a setting value corresponding to the specified option. Thus, the selected setting value is set in the single-lens reflex camera 100.

  In the case of the single-lens reflex camera 100 according to this embodiment, the operation unit 682 includes at least a shooting mode selection unit 684 and an adjustment mode selection unit 686. The shooting mode selection unit 684 has at least three options: tilt shooting mode, shift shooting mode, and normal shooting mode.

  In the tilt shooting mode, tilt shooting is performed in which the image sensor 330 is not orthogonal to the optical axis OA of the optical system of the lens unit 200. In the shift shooting mode, shift shooting is performed in which the image sensor 330 is translated and moved to a position where the center of the image sensor 330 is shifted from the optical axis OA. The normal shooting mode refers to a shooting mode that is neither the tilt shooting mode nor the shift shooting mode. That is, the normal shooting mode means a shooting mode in which shooting is performed in a state where the optical axis OA and the light receiving surface of the image sensor 330 are orthogonal to each other and the optical axis OA of the lens unit 200 passes through the center of the image sensor 330.

  In the adjustment mode that can be selected by the adjustment mode selection unit 686, the mounting position and mounting posture of the image sensor 330 in the single-lens reflex camera 100 are automatically adjusted. The shift shooting mode, tilt shooting mode, and adjustment mode will be described later with reference to other drawings.

  In the internal circuit 600 as described above, the attitude adjustment unit 650 adjusts the attitude of the image sensor 330 by driving the image sensor unit 500 based on the focus detection signal under the control of the main body CPU 322. That is, the attitude adjustment unit 650 supplies a driving pulse corresponding to the amount of movement of the image sensor substrate 520 to each of the stepping motors 542.

  The stepping motor 542 operates by an amount corresponding to the supplied drive pulse to displace the feed screw 544. Thereby, it is possible to cause the image sensor substrate 520 to take a target posture or position.

  FIG. 6 is a schematic diagram for explaining another operation of the image sensor unit 500. In the state shown in the figure, the feed screws 544 in the actuators 535 and 536 are both lowered as compared with the state shown in FIGS. Further, the feed screw 544 of the actuator 534 has moved to the left in the drawing.

  Since the image pickup device substrate 520 is urged by the urging member 514, it translates following the displaced feed screw 544. Thereby, the image sensor 330 shifts downward and leftward in the figure. As described above, the posture adjustment unit 650 can translate the image sensor 330 in the X direction and the Y direction indicated by the arrows in the drawing by operating the actuators 534, 535, and 536.

  FIG. 7 is a schematic diagram for explaining another operation of the image sensor unit 500. In the state shown in the figure, the feed screw 544 of the actuator 535 is raised while the feed screw 544 of the actuator 536 is lowered as compared with the state shown in FIGS.

  Since the image pickup device substrate 520 is urged by the urging member 514, it swings following the displaced feed screw 544. As described above, the posture adjustment unit 650 can rotate the imaging device 330 in the θ direction indicated by the arrow in the drawing by operating the actuators 534, 535, and 536.

  FIG. 8 is a schematic diagram for explaining another operation of the image sensor unit 500. In the state shown in the drawing, compared to the state shown in FIGS. 2 and 3, the feed screw 544 is located on the left side in the drawing, that is, in front of the single-lens reflex camera 100 in the actuators 532 and 533 that contact the image sensor substrate 520 from behind. It is displaced towards. Although not shown in the drawing, the actuator 531 operates in the same manner.

  Thereby, the image sensor 330 translates to the left in the drawing. As described above, the posture adjustment unit 650 can translate the image sensor 330 in the Z direction indicated by the arrow in the drawing by operating the actuators 531, 532, and 533.

  FIG. 9 is a schematic diagram for explaining still another operation of the image sensor unit 500. In the state shown in the drawing, compared with the state shown in FIGS. 2 and 3, the upper screw 544 is in the left side of the drawing, that is, in front of the single-lens reflex camera 100 in the upper actuator 532 that contacts the image sensor substrate 520 from the back. It is displaced toward. Although not shown in the drawing, the actuator 531 operates in the same manner.

  As a result, the image sensor 330 is tilted forward. Note that when the feed screw 544 of the lower actuator 533 is moved forward and when the feed screw 544 of the upper actuators 531 and 532 is moved backward, the image sensor 330 tilts backward. As described above, the posture adjustment unit 650 can swing the imaging device 330 around the X axis, that is, in the α direction indicated by the arrow in the drawing by operating the actuators 531, 532, and 533.

  Similarly, of the actuators 531, 532, and 533 that come into contact with the image sensor substrate 520 from behind, the posture adjustment unit 650 includes the feed screw 544 of the actuators 531 and 533 on the back side in the drawing and the actuator 532 on the front side in the drawing. By giving a different displacement to the feed screw 544, the posture adjustment unit 650 can swing the image sensor 330 around the Y axis, that is, in the β direction indicated by an arrow in the drawing.

  By combining a series of operations of the image sensor unit 500 as described above, the attitude adjustment unit 650 can translate or swing the image sensor 330 in each of the X, Y, Z, α, β, and θ directions. it can. Such a function can automate the shift shooting mode and the tilt shooting mode described above in addition to the adjustment of the mounting position of the image sensor 330 in the single-lens reflex camera 100.

  FIG. 10 is a flowchart illustrating a part of the control procedure of the posture adjustment unit 650 when the adjustment mode is selected by the adjustment mode selection unit 686. In the adjustment mode, the mounting position of the image sensor 330 with respect to the camera body 300 is adjusted.

  Prior to execution of the adjustment mode, an adjustment lens is attached to the camera body 300 including the image sensor unit 500 (step S101). The adjustment lens includes a screen having a test pattern and an optical system adjusted to form an image of the test pattern on the planned focal plane of the camera body 300. The test pattern includes, for example, a horizontal line and a vertical line orthogonal to each other at the center of the planned focal plane.

  Next, the posture adjustment unit 650 adjusts the center pixel position of the image sensor 330 to coincide with the center position of the test pattern in order to align the image sensor in the X-axis direction and the Y-axis direction (step S102). FIG. 11 shows an example of the processing procedure in step S102.

  As shown in FIG. 11, the posture adjustment unit 650 first reads a captured image signal of a test pattern imaged by the image sensor 330, and determines the test pattern from the vertical position of the horizontal line and the horizontal position of the vertical line. The center position is detected (step S201). The position of the horizontal line of the test pattern can be known by detecting the center of the image of the horizontal line appearing in each of the pixel columns in two or more pixel columns including a plurality of vertically aligned pixels. The position of the vertical line of the test pattern can be known by detecting the center of the image of the vertical line appearing in each of the pixel columns in two or more pixel columns including a plurality of pixels arranged horizontally.

  Subsequently, the posture adjustment unit 650 calculates a deviation between the center position of the detected test pattern and the center pixel position of the image sensor 330 (step S202). If the calculated deviation is zero (step S203: YES), The posture adjustment unit 650 determines that the center position of the test pattern matches the center pixel position of the image sensor 330, and proceeds to the next procedure (step S103) in the flowchart shown in FIG.

  When the calculated deviation has a significant difference (step S203: NO), the posture adjustment unit 650 operates the actuators 534, 535, and 536 to cancel the deviation of the center position and the center pixel position, and causes the image sensor 330 to operate. Translation is performed in at least one of the X direction and the Y direction (step S204). Thereafter, the posture adjustment unit 650 repeats the detection of the center position of the test pattern (step S205) and the calculation of the deviation from the center pixel of the image sensor 330 (step S206).

  When the deviation calculated in step S206 has a significant difference (step S207: NO), the posture adjustment unit 650 operates the actuators 534, 535, and 536 to eliminate the deviation detected in steps S204 and S205. After that, steps S205 and S206 are repeated. When the calculated deviation is zero (step S207: YES), the posture adjustment unit 650 ends the process according to step S102 illustrated in FIG.

  Referring to FIG. 10 again, the posture adjustment unit 650 next adjusts the inclination θ around the optical axis OA (around the Z axis) of the image sensor 330 (step S103). FIG. 12 shows an example of the processing procedure in step S103.

  As illustrated in FIG. 12, the posture adjustment unit 650 first reads a captured image signal of a test pattern captured by the image sensor 330 and detects a horizontal line of the test pattern on the image sensor 330 (step S301). Next, the attitude adjustment unit 650 calculates the inclination θ of the image sensor 330 based on the detected inclination of the horizontal line (step S302). Here, when the calculated inclination θ is zero (step S303: YES), the posture adjustment unit 650 ends step S103 in FIG.

  When the calculated inclination θ has a significant value (step S303: NO), the posture adjustment unit 650 operates the actuators 534, 535, and 536 to eliminate the inclination θ, and moves the image sensor 330 around the Z axis (light It is rotated around the axis OA (step S304). Thereafter, the posture adjustment unit 650 captures and detects again the horizontal line of the test pattern on the image sensor 330 (step S305). Next, the attitude adjustment unit 650 calculates the inclination θ of the image sensor 330 based on the detected inclination of the horizontal line (step S306).

  When the inclination θ calculated in step S306 has a significant value (step S307: NO), the posture adjustment unit 650 operates the actuators 534, 535, and 536 to eliminate the inclination θ, and then, in step S305, S306 is repeated. When the inclination θ calculated in step S306 is zero (step S307: YES), the posture adjustment unit 650 ends the process related to step S103 illustrated in FIG.

  Referring to FIG. 10 again, next, the attitude adjustment unit 650 adjusts the inclination α around the X axis of the image sensor 330 (step S104). FIG. 13 shows an example of the processing procedure in step S104.

  As illustrated in FIG. 13, the posture adjustment unit 650 detects a test pattern image using a pair of focus detection areas 333 and 335 that are vertically separated from each other in the image sensor 330 (step S <b> 401). Next, the posture adjustment unit 650 calculates the defocus amount in each of the focus detection areas 333 and 335 (step S402). If the calculated defocus amounts are equal to each other (step S403: YES), the posture adjustment unit 650 ends step S104 in FIG.

  When the calculated defocus amount has a significant difference (step S <b> 404: NO), the posture adjustment unit 650 operates the actuators 531, 532, and 533 to equalize the calculated defocus amount, and causes the image sensor 330 to move. It is swung around the X axis (step S404). After that, the posture adjustment unit 650 performs again the detection of the test pattern by the focus detection areas 333 and 335 (step S405) and the calculation of the defocus amount in each of the focus detection areas 333 and 335 (step S406).

  When the defocus amount calculated in step S406 has a significant difference (step S407: NO), the attitude adjustment unit 650 operates the actuators 531, 532, and 533 to equalize the defocus amount again. Steps S405 and S406 are repeated. When the defocus amounts calculated in step S406 are equal to each other (step S407: YES), the posture adjustment unit 650 ends the process related to step S104 illustrated in FIG.

  Referring to FIG. 10 again, next, the attitude adjustment unit 650 adjusts the inclination β around the Y axis of the image sensor 330 (step S105). Since the processing procedure in step S105 is substantially the same as the processing procedure in step S104, it is also shown in FIG.

  That is, in step S105, the posture adjustment unit 650 detects a test pattern image using the pair of focus detection areas 337 and 339 that are horizontally separated in the image sensor 330 (step S401). Next, the posture adjustment unit 650 calculates the defocus amount in each of the focus detection areas 337 and 339 (step S402). If the calculated defocus amounts are equal to each other (step S403: YES), the posture adjustment unit 650 ends step S105 in FIG.

  When the calculated defocus amount has a significant difference (step S <b> 404: NO), the posture adjustment unit 650 operates the actuators 531, 532, and 533 to equalize the calculated defocus amount, and causes the image sensor 330 to move. It is swung around the Y axis (step S404). Thereafter, the posture adjustment unit 650 again performs test pattern detection using the focus detection areas 337 and 339 (step S405) and calculation of the defocus amount in each of the focus detection areas 337 and 339 (step S406).

  When the defocus amount calculated in step S406 has a significant difference (step S407: NO), the posture adjustment unit 650 operates the actuators 531, 532, and 533 to equalize the defocus amount, and then performs step. S405 and S406 are repeated. When the defocus amounts calculated in step S406 are equal (step S407: YES), the attitude adjustment unit 650 ends the process related to step S105 illustrated in FIG.

  Referring to FIG. 10 again, the posture adjustment unit 650 further adjusts the position of the image sensor 330 in the Z direction (step S106). FIG. 14 shows an example of the processing procedure in step S106.

  As illustrated in FIG. 14, the posture adjustment unit 650 detects an image of the test pattern by using the focus detection region 331 disposed in the center of the image sensor 330 (step S501). Next, the posture adjustment unit 650 calculates the defocus amount in the focus detection area 331 (step S502). If the calculated defocus amount is zero (step S503: YES), the posture adjustment unit 650 ends step S106 in FIG.

  When the calculated defocus amount has a significant value (step S504: NO), the posture adjustment unit 650 operates the actuators 531, 532, and 533 to cancel the calculated defocus amount, and causes the image sensor 330 to operate. Translation is performed in the Z-axis (optical axis OA) direction (step S504). Thereafter, the posture adjustment unit 650 performs again the detection of the test pattern by the focus detection area 331 (step S505) and the calculation of the defocus amount in the focus detection area 331 (step S506).

  When the defocus amount calculated in step S506 has a significant value (step S507: NO), the posture adjustment unit 650 operates the actuators 531, 532, and 533 to eliminate the defocus amount, and then performs step. S505 and S506 are repeated. When the defocus amount calculated in step S506 is zero (step S507: YES), the posture adjustment unit 650 ends the process related to step S106 illustrated in FIG.

  In this way, the posture adjustment unit 650 adjusts the attachment position of the image sensor 330 with respect to the camera body 300 with respect to all six axes. In addition, the attitude adjustment unit 650 adjusts the mounting position of the image sensor 330 by feedback-controlling the stepping motor 542 of the actuators 531 to 536 while referring to the defocus amount detected by the image sensor 330 itself. Therefore, the above-described series of procedures can be automatically executed while maintaining high adjustment accuracy.

  Note that the adjustment procedure described above can be executed even with a single-lens reflex camera 100 including an image pickup device 330 that does not have the focus detection pixel 336 as long as the image pickup apparatus has an automatic focusing function. Further, by using the detection function of the focus detection pixel 336 or the focus detection element 382, the adjustment procedure can be executed by an adjustment device arranged outside the imaging device.

  In the above example, the adjustment procedure according to steps S102 to S106 illustrated in FIG. However, the adjustment in steps S102 to S106 may change the adjustment results in other steps S102 to S106. Therefore, any or all of steps S102 to S106 may be executed a plurality of times. In addition, after step S106, it may be confirmed that the test pattern is in focus in all the focus detection areas 331, 333, 335, 337, and 339.

  Further, in steps S104, S106, and S108, a contrast type automatic focusing function is provided by displacing the image sensor 330 so that the test pattern is focused for each area instead of detecting the defocus amount. The adjustment procedure can also be executed in a mirrorless camera or a compact camera.

  In the above-described series of position adjustment procedures, the order of adjusting the position of the image sensor 330 in the X direction, Y direction, Z direction, α direction, β direction, and θ direction is not limited to the above order. Furthermore, the program for executing the above-described series of adjustment procedures may be executed by being mounted in advance on the single-lens reflex camera 100, or installed and executed on the single-lens reflex camera 100 through a secondary storage medium, a communication line, or the like. You may let them.

  Furthermore, the adjustment of the mounting position as described above may be performed at the time of shipment of the camera body 300 from the factory, or after shipment as a maintenance service. In addition, it is possible to compensate for the focal position deviation for each lens unit 200 by adjusting the mounting position of the image sensor 330 for each lens unit 200 to be attached to the camera body 300.

  FIG. 15 is a flowchart illustrating a control procedure of the posture adjustment unit 650 when the shift shooting mode is selected by the shooting mode selection unit 684. In the shift shooting mode, the single-lens reflex camera 100 captures an image while shifting the image sensor 330 in at least one of the X direction and the Y direction.

  The posture adjustment unit 650 waits until the shooting mode is selected by the shooting mode selection unit 684 (step S601: NO). When the shift shooting mode is selected by the shooting mode selection unit 684 (step S601: YES), the posture adjustment unit 650 causes the display unit 340 to display a through image captured by the image sensor 330 (step S602).

  Next, the posture adjustment unit 650 causes the user to specify a plurality of straight lines that are desired to be photographed in parallel in the through image (step S603). The straight line is specified by, for example, moving the line pattern displayed on the through image on the display unit 340 using the cross key of the camera body 300 and confirming it with another button.

  Next, the posture adjustment unit 650 moves the image sensor 330 in the surface direction of the light receiving surface 338 so that the specified straight line is parallel (step S604). Subsequently, the posture adjustment unit 650 checks whether or not the designated straight line has become parallel (step S605). When the designated straight line is not parallel (step S605: NO), the posture adjustment unit 650 returns to step S604 and further moves the image sensor 330.

  When the designated straight line becomes parallel (step S605: YES), the posture adjustment unit 650 causes the single-lens reflex camera 100 to perform shooting (step S606). Alternatively, in step S606, the user may be informed that shooting is possible.

  As described above, the posture adjustment unit 650 automatically executes the shooting effect by shifting the image sensor 330 in accordance with the user's designation. Therefore, the user can enjoy the effect of shift shooting without knowledge about shift shooting.

  In the above procedure, the user designates an object to be photographed in parallel in the object scene. However, for example, the posture adjustment unit 650 may automatically calculate the shift amount of the image sensor 330 from the posture of the single-lens reflex camera 100 acquired from the posture detection unit 310. Further, the shift amount calculated by the posture adjustment unit 650 may be further corrected by the user.

  FIG. 16 is a flowchart illustrating a control procedure of the posture adjustment unit 650 when the tilt shooting mode is selected by the shooting mode selection unit 684. In the tilt shooting mode, the single-lens reflex camera 100 shoots a plurality of subjects with different distances from the single-lens reflex camera 100 while simultaneously focusing.

  The posture adjustment unit 650 waits until the shooting mode is selected by the shooting mode selection unit 684 (step S701: NO). When the tilt shooting mode is selected in the shooting mode selection unit 684 (step S701: YES), the posture adjustment unit 650 causes the display unit 340 to display a through image captured by the image sensor 330 (step S702).

  Next, the posture adjustment unit 650 causes the user to specify a plurality of areas desired to be focused in the through image (step S703). The area is specified by, for example, specifying some of the existing in-focus areas with the cross key of the camera body 300 or the like.

  Next, the posture adjustment unit 650 changes the inclinations of the imaging element 330 in the α direction and the β direction so that any of the designated areas is in focus (step S704). Subsequently, the posture adjustment unit 650 checks whether or not the subject is in focus in the designated area (step S705). If the designated area includes an area that is not in focus (step S705: NO), the posture adjustment unit 650 returns to step S704 and further moves the image sensor 330.

  If there are three or more designated areas, there may be areas that cannot be focused simultaneously with other areas. In such a case, the posture adjustment unit 650 may recommend the user to cancel the designation of any region.

  When the subject is in focus in all the designated areas (step S705: YES), the posture adjustment unit 650 causes the single-lens reflex camera 100 to perform shooting (step S706). Alternatively, in step S306, the user may be notified that shooting is possible.

  As described above, the posture adjustment unit 650 automatically executes a shooting effect by swinging the image sensor 330 in the α direction or the β direction in accordance with the user's designation. Thus, the user can enjoy the effects of tilt shooting without knowledge about tilt shooting.

  Note that the posture adjustment unit 650 may automatically adjust the tilt amount so as to compensate for the backward or forward tilt of the image sensor 330 based on the tilt of the single-lens reflex camera 100 acquired from the posture detection unit 310. Good. In addition, when photographing a distant subject with a wide-angle lens, the posture adjustment unit 650 compensates for the inclination in the θ direction of the single-lens reflex camera 100 acquired from the posture detection unit 310 and automatically sets the image sensor 330 to be horizontal. May be.

  Note that the posture adjustment unit 650 desirably records the position of the image sensor 330 adjusted in the adjustment mode. Thereby, when the normal shooting mode is designated after executing the shift shooting mode and the tilt shooting mode, the image sensor 330 can be returned to the original position. In addition, the series of control procedures of the posture adjustment unit 650 as described above in the shift shooting mode and the tilt shooting mode may be a mirrorless camera or a compact camera including the image sensor 330 that does not have the focus detection pixel 336. Can be executed.

  FIG. 17 is a diagram illustrating the structure of an image file 700 generated by the single-lens reflex camera 100. The image file 700 stores main image data 710, thumbnail image data 720, and tag data 730.

  The main image data 710 corresponds to captured image data captured by the imaging unit 660 of the camera body 300. In contrast, the thumbnail image data 720 has a lower resolution, color depth, and the like than the main image data 710. This facilitates handling when a plurality of main image data 710 stored in the single-lens reflex camera 100 is displayed as a list.

  The tag data 730 stores specifications of the single-lens reflex camera 100 that captured the main image data 710, imaging conditions, and the like. When the JPEG (Joint Photographic Experts Group) format is adopted as the file format of the main image data 710, the image file with tag data includes information defined as an EXIF file.

  More specifically, in addition to the basic information such as the maker, specification, firmware version, and open F value of the single-lens reflex camera 100 that captured the main image data 710, the exposure time, F value, ISO value, Shooting information such as focal length and shooting date / time is recorded. Further, for example, when the single-lens reflex camera 100 has an additional function such as a GPS function, the GPS information of the place where the image was taken may be added to the tag data 730.

  In the single-lens reflex camera 100, the tag data 730 is generated when the release button is pressed halfway and the photographing condition is fixed. Further, in the single-lens reflex camera 100, when the release button is pressed halfway down to full press, the generated tag data 730 is stored in the image file 700 together with the main image data 710.

  Here, the tilt angle giving unit 614 sets the tilt angle set in the image sensor 330 in the image sensor unit 500 when the release button is pressed halfway as the tilt angle information 740 that is a part of the tag data 730. prepare. Further, when the release button is fully pressed, the tag data 730 including the tilt angle information 740 is stored in the secondary storage medium 670 in association with the captured main image data.

  Similarly, the shift amount giving unit 616 sets the shift amount set in the image sensor 330 in the image sensor unit 500 as the shift amount information 750 that is a part of the tag data 730 when the release button is half-pressed. prepare. Further, when the release button is fully pressed, the tag data 730 including the shift amount information 750 is stored in the secondary storage medium 670 in association with the captured main image data.

  Thus, since the tilt angle information 740 and the shift amount information 750 are stored in the captured image information, the tilt angle and the shift angle related to the captured image can be known later. As a result, the image file 700 stores information more than mere image information. For example, the main body CPU 322 can execute the survey calculation based on the shift amount read from the image file 700 and the distance information with the subject in the survey calculation unit 612 to calculate the height of the subject.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 100 Single-lens reflex camera, 200 Lens unit, 210 Fixed cylinder, 220, 230, 240 Lens, 250 Lens mount, 260 Lens barrel main body CPU, 300 Camera main body, 310 Attitude detection part, 320 Main board, 322 Main body CPU, 324 Image processing , 330 Imaging device, 331, 333, 335, 337, 339 Focus detection area, 332 Low pass filter, 334 Imaging pixel, 336 Focus detection pixel, 338 Light receiving surface, 340 Display unit, 350 finder, 352 Focus plate, 354 Penta prism 356 finder optical system, 360 body mount, 370 focal plane shutter, 380 focusing optical system, 382 focus detection element, 390 photometric sensor, 400 mirror unit, 410 main mirror holding frame, 420 main mirrorー, 430 Main mirror rotation shaft, 440 Positioning pin, 450 Sub mirror holding frame, 460 Sub mirror, 470 Sub mirror rotation shaft, 480 Stopper, 500 Image sensor unit, 510 frame, 512 Flange, 514 Biasing member, 520 Image sensor Substrate, 522 Spring seat, 524, 548 Knife edge, 531, 532, 533, 534, 535, 536 Actuator, 542 Stepping motor, 544 Feed screw, 546 Spike, 600 Internal circuit, 612 Surveying calculation unit, 614 Slope angle giving unit , 616 Shift amount assigning unit, 620 Program memory, 630 Main memory, 650 Attitude adjustment unit, 660 Imaging unit, 662 Imaging element driving unit, 664 Analog / digital conversion unit, 670 Secondary storage medium, 680 input , 682 operation unit, 684 imaging mode selection unit, 686 adjustment mode selection unit, 690 display driving unit, 700 image file, 710 this image data, 720 thumbnail image data, 730 tag data 740 tilt angle information, 750 a shift amount information

Claims (6)

An image sensor that includes a pixel having a light receiving unit that receives light from a subject that has passed through the imaging optical system, and that outputs a signal from the pixel;
An attitude for adjusting the tilt of the imaging element with respect to the optical axis of the imaging optical system according to the focusing state of the plurality of areas detected by the signals output from the pixels for the plurality of areas designated as the areas to be focused An adjustment unit,
If the posture adjustment unit does not focus on a part of the three or more regions to be focused by adjusting the tilt of the image sensor based on the in-focus state, any one of the plurality of regions is designated. an imaging device that performs a notification Ru recommend that you revoke. An image sensor that includes a pixel having a light receiving unit that receives light from a subject that has passed through the imaging optical system, and that outputs a signal from the pixel;
An attitude for adjusting the tilt of the imaging element with respect to the optical axis of the imaging optical system according to the focusing state of the plurality of areas detected by the signals output from the pixels for the plurality of areas designated as the areas to be focused An adjustment unit,
The posture adjustment unit is an image pickup apparatus that notifies that a state in which photographing can be performed is obtained when the plurality of regions that are focused by adjusting the tilt of the image pickup element based on the focus state are in focus. The imaging element receives, as the pixel, a first light receiving unit that receives light from a subject that has passed through a part of the imaging optical system and a light that is received from the subject that has passed through another part of the imaging optical system. The imaging apparatus according to claim 1, further comprising: a detection pixel that detects an image shift of a subject image having two light receiving units, and outputs a signal for detecting a focus state from the detection pixel.   The posture adjustment unit translates the imaging element in an optical axis direction of the imaging optical system and two directions perpendicular to the optical axis direction, respectively, and around the optical axis direction and perpendicular to the optical axis direction. The imaging device according to any one of claims 1 to 3, wherein the imaging device is swung around each of two directions.   The imaging apparatus according to claim 1, wherein the attitude adjustment unit includes a stepping motor that changes the attitude of the imaging element.   The imaging apparatus according to claim 1, wherein shift photographing is performed by adjusting a shift amount of the imaging element by the posture adjustment unit.

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