JP2003114461A - Lens frame device and electronic camera using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens frame device realizing miniaturization though it is equipped with a filter unit where a plurality of ND filters and a cove means are properly arranged on the optical path of a photographic optical system in a lens frame device equipped with a turning optical system, and a compact electronic camera to which the lens frame device is to be applied. SOLUTION: This lends frame device is equipped with the photographic optical system equipped with a light turning member 21a reflecting incident luminous flux, and the cover means for selectively shielding or exposing the surface of eh reflection member on which subject luminous flux is made incident. The cover means is constituted of a plurality of plate-like members 61, which are provided to move independently respectively, and is equipped with moving means 63 and 64 for moving the cover means between a service position set on the front of the reflection member and a retreated position being a position retreated from the service position and separated in a direction where the incident luminous flux advances along the optical axis O2 of the luminous flux turned by the reflection member.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens frame device, and more particularly, to a lens frame device used in an electronic camera or the like capable of recording a subject image as electronic image data. The present invention relates to a lens frame device that employs a so-called bending optical system that includes a reflecting member that bends a shaft.

[0002]

2. Description of the Related Art Conventionally, a subject image formed based on a light flux from a subject (hereinafter referred to as a subject light flux) incident on a photographing optical system including a plurality of lens groups and the like is obtained at a predetermined position. Means, such as a charge coupled device (C
A desired subject image is obtained by forming an image on a light receiving surface of an image pickup device such as a CD; Charge Coupled Device).
Electronic cameras such as so-called electronic still cameras and digital video cameras, which are configured to be able to record them in a predetermined recording medium in a predetermined form, have been generally put into practical use and widely spread.

In such a conventional electronic camera,
In general, a lens frame device (hereinafter referred to as a lens unit) including a photographing optical system such as a plurality of lenses is provided to form a subject image at a predetermined position.

Regarding a lens unit in a conventional electronic camera, for example, in order to guide a subject light flux that enters the inside of the electronic camera through a plurality of lenses onto a light receiving surface of an image pickup device or the like, a prism is provided in the optical path thereof. There are various forms such as a structure in which a predetermined reflecting member such as a mirror or a reflecting mirror is arranged and the optical path of the subject light flux is bent in a predetermined direction, for example, a direction substantially perpendicular to the incident optical axis. Is commonly known.

Various proposals have been made for the lens unit to which the so-called bending optical system as described above is applied, for example, in Japanese Patent Laid-Open No. 2001-75162.

In the lens unit disclosed in Japanese Patent Laid-Open No. 2001-75162, a reflecting member that bends the optical axis of the subject light flux in a substantially perpendicular direction is arranged in the optical path of the photographing optical system through which the subject light flux passes. Therefore, the electronic camera itself has been downsized while ensuring the optical path length required for acquiring an image.

As described above, employing the so-called bending optical system in which the reflecting member is arranged in the optical path of the photographing optical system of the electronic camera is a very advantageous means for realizing the downsizing of the electronic camera itself. .

[0008] By the way, as a main usage of a general electronic camera, it is usual that a user takes it out to a field or the like and uses it. For this reason, the portability of the electronic camera has been conventionally emphasized, and there is a demand for further thinning and miniaturization of the electronic camera itself.

Further, in recent electronic cameras, the image pickup element tends to be downsized along with the downsizing. Along with this, the photographing optical system is also downsized. When the photographic optical system is downsized, its effective aperture is reduced.

Further, a photographing optical system applied to a general electronic camera or the like is usually constituted by including a diaphragm mechanism for limiting the amount of incident light flux.

In a general form of the diaphragm mechanism, the effective aperture of the photographing optical system is displaced by a predetermined constituent member such as diaphragm blades. In this case, the smaller the effective aperture of the photographic optical system that is stopped down by the aperture mechanism, the easier the light diffraction phenomenon occurs. Therefore, the smaller the effective aperture, the worse the image quality of the resulting image. It is well known that there is a tendency to fall. Therefore,
In order to obtain a higher quality image, it is necessary to limit the setting on the small diameter diaphragm side.

Here, in the case of taking a picture using a general electronic camera or the like, setting a small-diameter aperture means, for example, a condition that the surrounding environment including a subject is sufficiently bright,
That is, this is a case of photographing or the like under high brightness conditions.

Therefore, under such a condition, a means for reducing the amount of transmitted light which enters the photographing optical system and is transmitted therethrough, and which does not depend on the diaphragm mechanism, is, for example, a predetermined dimming. A means for arranging an optical filter having a function, a so-called ND filter (Neutral Density filter) or the like on the front surface of the photographing optical system (incident surface of the light flux) or in the optical path of the photographing optical system has been generally put into practical use. There is.

For example, the lens frame device disclosed in Japanese Patent Application Laid-Open No. 11-194417 discloses an optical member (position between an optical path of the photographing optical system and a position retracted from the optical path of the photographing optical system). The ND filter is provided with a filter switching mechanism that can move the ND filter.

According to this, the optical member such as the ND filter is not fixed to the front surface of the photographing optical system or a predetermined position in the optical path, but the ND filter or the like is arranged in the optical path of the photographing optical system as needed. Since it can be evacuated, it is easy to deal with various shooting conditions.

In this case, since the ND filter arranged at a predetermined position in the optical path has a constant set density, it may not be possible to adapt to various photographing conditions by itself. .

Therefore, a filter switching means for preparing a plurality of optical members such as ND filters having different densities so that the plurality of optical members can be appropriately inserted into and removed from the optical path according to the photographing conditions is disclosed in, for example, Japanese Patent Laid-Open No. 2000-2000. -3051
Various proposals have been made in Japanese Patent No. 50, etc.

In such a filter switching means, a plurality of filters having different densities can be appropriately combined and used, so that a more reliable shooting can be performed by using an appropriate optical member according to the shooting conditions. The result can be obtained.

[0019]

However, the above-mentioned JP-A Nos. 11-194417 and 2000-3051 have been disclosed.
In the conventional means disclosed in Japanese Patent Laid-Open No. 50, etc., since the optical members such as the ND filter are moved to the respective retracted positions by rotating, the optical members, the cover member and the like are retracted positions. It is necessary to secure an arrangement space for the movement to the above position, and the arrangement space for members such as actuators that constitute the movement switching mechanism becomes large. Therefore, there is a problem in that the electronic camera that adopts this becomes large in size.

That is, in the electronic camera having the lens frame device having the bending optical system, the camera itself can be made thin by devising the arrangement of the photographing optical system as described above. When the ND filter configured to be switchable is provided for the electronic camera to which the folding optical system is applied, using the means described in the above publication may impede downsizing and thinning of the camera. There is a problem.

Further, a plurality of ND filters having different densities are arranged side by side on the peripheral surface of the disc member, and the disc members are rotated to insert the ND filters having a desired concentration into the optical path of the photographing optical system. A so-called turret type filter switching means that can be used is also conceivable.

In this case, more kinds of optical members (ND filters) can be arranged in the shape of one disk member, and a desired ND filter can be taken as necessary by taking a photographic optical element with a simpler structure. There is an effect that it can be easily arranged in the optical path of the system.

However, in this example, a plurality of NDs are used.
The disk member itself equipped with the filter will become large. In order to arrange such a disc member inside the lens unit or in the vicinity of the lens unit, a larger space is required.

Therefore, according to this means, there is a problem that the lens unit itself and the electronic camera to which it is applied cannot be increased in size.

The present invention has been made in view of the above points, and an object thereof is to provide a plurality of optical members (ND filters, etc.) in a lens frame device having a bending optical system, and By efficiently arranging a filter unit including constituent members such as a switching mechanism that switches so that a desired optical member among a plurality of optical members is appropriately arranged on the optical path of the photographing optical system in or near the apparatus. An object of the present invention is to provide a lens frame device that is downsized.

Another object of the present invention is to provide an electronic camera which is capable of maintaining a small size while realizing a multi-functionality by applying the downsized lens frame device. is there.

[0027]

In order to achieve the above object, a lens frame device according to a first aspect of the present invention includes a photographing optical system including a reflecting member that bends an incident light beam, and an incident surface of a subject light beam on the reflecting member. And a cover means for selectively shielding or exposing the above-mentioned cover means, the cover means is composed of a plurality of plate-shaped members, and these plate-shaped members are provided so that they can move independently of each other. Between a use position located on the front surface of the optical disc and a retracted position which is a position retracted from the use position and is separated in a traveling direction of the incident light flux along the optical axis of the light flux after being bent by the reflecting member. A moving means for moving the cover means is provided.

According to a second aspect of the present invention, in the lens frame device according to the first aspect of the present invention, an image is picked up on the optical axis of the subject light flux after being bent by the reflecting member to receive the subject light flux and perform photoelectric conversion. An element is further provided, and the retracted position of the cover means is set to a position closer to the reflecting member than the image pickup device in the direction along the optical axis of the light flux after being bent by the reflecting member. Characterize.

Therefore, according to the lens frame device of the second aspect of the present invention, the moving means can be efficiently arranged in the vicinity of the lens frame device. It is possible to suppress the enlargement of the lens frame device.

A third aspect of the present invention is the lens frame device according to any one of the first aspect and the second aspect, wherein the plurality of plate-shaped members of the cover means are incident light fluxes on the reflecting member. Are arranged so as to be stacked in a direction along the optical axis of the.

Therefore, according to the lens frame device of the third aspect of the present invention, since the plate members of the cover means are arranged so as to be stacked, it is possible to prevent the lens frame device from increasing in size.

A fourth invention is the lens frame device according to any one of the first invention, the second invention, or the third invention, wherein the moving means comprises the plurality of plate-shaped members. It is characterized in that at least two or more of these plate-shaped members can be arranged at the use positions at the same time.

Therefore, according to the lens frame device of the fourth aspect of the present invention, since a plurality of plate-like members of the cover means can be combined and arranged at the use position, they are used in a combination of more than the number of plate-like members. be able to.

A fifth aspect of the present invention is the lens frame device according to any one of the first to fourth aspects of the present invention, wherein the moving means includes independent actuators for each of the plurality of plate-shaped members. It is characterized by

Therefore, according to the lens frame device of the fifth aspect of the present invention, each plate-shaped member can be moved independently, so that each plate-shaped member is used independently. It can be arbitrarily arranged at the position or the retracted position.

A sixth invention is the lens frame device according to any one of the first to fifth inventions, wherein at least one of the plurality of plate members is an ND filter. And

In a seventh aspect of the present invention, in the lens frame device according to any one of the first to sixth aspects of the invention, the plate-shaped member disposed on the outermost side of the plurality of plate-shaped members is the above-mentioned. It is a protective cover member for protecting the front surface of the reflecting member.

Therefore, according to the lens frame device of the seventh aspect of the invention, it is not necessary to separately provide a protective cover member for protecting the photographing optical system from the outside, which can contribute to downsizing of the device itself. .

An eighth invention is the lens frame device according to any one of the first to seventh inventions, wherein at least one of the plurality of plate members is a light shielding shutter member. Is characterized by.

Therefore, according to the lens frame device of the eighth aspect of the invention, it is not necessary to separately provide a shutter means inside the photographing optical system, which can contribute to downsizing of the device itself.

A ninth invention is the lens frame device according to the eighth invention, wherein the light-shielding shutter member is arranged at a position closest to the reflecting member among the plurality of plate-shaped members, and When the other plate-shaped member is placed at the retracted position together with the shutter member, the light-shielding shutter member covers the surface of the other plate-shaped member facing the photographing optical system, so that the other plate-shaped member is used for the photographing optical system. It is characterized in that it is configured so as not to be exposed to the system.

Therefore, according to the lens frame device of the ninth invention, the unnecessary reflected light beam generated inside the photographing optical system is reflected by the plate member arranged at the retracted position, and this harmful light beam reaches the image pickup element. It is possible to prevent the occurrence of the above and obtain a good image.

An electronic camera according to a tenth aspect of the invention is characterized by being provided with the lens frame device according to any one of the first to ninth aspects of the invention.

[0044]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the illustrated embodiments. FIG. 1 is a perspective view showing the appearance of an electronic camera equipped with a lens frame device according to a first embodiment of the present invention. FIG. 2 is a perspective view schematically showing main internal components of the electronic camera. Further, FIG. 3 is an exploded perspective view showing main components of the lens frame device (lens unit) of the present embodiment.

First, an electronic camera equipped with the lens frame device of this embodiment will be described with reference to FIGS. Figure 1
As shown in FIG. 2, the electronic camera 1 including the lens frame device of the present embodiment has various constituent members inside and is an outer casing that is a casing formed so that its dimension in the depth direction becomes relatively small. The outer surface is constituted by the member 11. On the upper surface of the exterior member 11, operation members such as a release button 12 which is an operation member for instructing execution of the exposure operation are arranged.

On the front surface of the exterior member 11, a strobe light irradiation window 13 forming a part of the flash light emitting device is arranged at a predetermined position near the upper edge portion (not shown in FIG. 2). ). Then, at a predetermined position adjacent to the strobe light irradiation window 13, a photographing lens unit (not shown in FIG. 1, see FIG. 2, hereinafter simply referred to as a lens unit) 2 which is a lens frame device including a photographing optical system and the like 2 The taking lens window 14 which is an objective optical system window in which the objective optical system of FIG.

Inside the electronic camera 1, as shown in FIG. 2, a plurality of main circuit boards 15 are arranged at predetermined positions in the substantially central portion so as to be stacked along the depth direction of the electronic camera 1. Has been done.

The main circuit board 15 has a release button 12
An operation switch that interlocks with various operation members provided on the surface of the exterior member 11 and generates a corresponding predetermined instruction signal is mounted. Thus, when an operation member such as the release button 12 is operated, a predetermined instruction signal is generated according to the operation.

The main circuit board 15 is electrically connected to an image pickup board 28 which is provided in the lens unit 2 and on which an image pickup element which receives a light flux of an object and carries out photoelectric conversion is mounted. There is.

Inside the present electronic camera 1, at a predetermined position near one end, that is, at one end of the spaces formed at both ends of the main circuit board 15, the electronic camera is placed. A battery 16 serving as a power source for No. 1 is arranged. Although not shown, the battery 16 and the main circuit board 15 are electrically connected by a predetermined power supply connection line. As a result, the power of the battery 16 is supplied to the main circuit board 15 via the predetermined power supply circuit.

The above-mentioned lens unit 2 is fixed to the other end of the internal space of the electronic camera 1. In the vicinity of the lens unit 2, the ND filter unit 3 serving as a moving unit of the ND filter frame 61 that is a cover unit that selectively shields or exposes the incident surface of the subject light flux that enters the photographing optical system is located at a predetermined position. It is provided integrally with.

This ND filter unit 3 is a plate-like ND filter which is a moving member which holds a predetermined optical filter in a fixed manner and is movable in a predetermined direction (a direction along the optical axis O2 in FIG. 3). Frames 61 (plurality), ND filters 61aa and 61ab that are optical filters, and a filter frame guide plate 62 that guides when the ND filter frames 61 that are a plurality of plate-shaped members respectively move in predetermined directions, A linear actuator 63 for driving a filter frame (not shown in FIGS. 1 and 2) for independently moving each of the plurality of ND filter frames 61 (and the ND filters 61aa and 61ab) in a predetermined direction. (See FIG. 3) and the like. The detailed configuration of the ND filter unit 3 will be described later.

Next, the structure of the lens unit 2 applied to the electronic camera of this embodiment will be described in detail below.
As described above, the lens unit 2 is arranged at a predetermined position inside the electronic camera 1. As shown in FIG. 3, the lens unit 2 includes a plurality of lens groups (22a, 23a, 24a) that contribute to photographing, and a plurality of frame members (22, 23, 24) that respectively hold these lens groups.
And a lens frame drive mechanism for moving a part of these frame members in a predetermined direction, and an image picked up at a predetermined position by internally bending a light flux incident on the lens unit 2. The reflection optical member 21a, which is a reflection member that guides the light toward the light receiving surface of the element (not shown), and the prism frame 21 that fixes and holds the reflection optical member 21a.

Specifically, it is as follows. That is, the various constituent members that make up this lens unit 2 are as shown in FIG.
As shown in FIG. 5, they are arranged at predetermined positions on the upper surface of the lens unit base (hereinafter, simply referred to as “base”) 25. That is, the base 25 is a fixing member for fixing at least the reflective optical member 21a, the image pickup element (the image pickup substrate on which the image pickup element is mounted), and the like.

The photographic optical system of the lens unit 2 is a bending optical system and is a reflecting optical member 21a such as a prism made of optical glass or the like, and a magnification is changed by moving in the direction along the optical axis based on a predetermined instruction signal. A zoom lens group 22a, which is the first lens group that contributes to the operation, and a correction system, which is the second lens group, that performs the focus adjustment operation and corrects the deviation of the focus adjustment state caused by the zoom operation. Lens group 23
a and a fixed lens group 24a for finally forming an image of a subject on a predetermined light receiving surface of an image pickup element (not shown).

These lens groups are arranged from the position closest to the subject to the reflective optical member 21a and the zoom lens group 2
2a, the correction system lens group 23a, and the fixed lens group 24a are arranged in this order, and an image pickup substrate 28 on which an image pickup element (not shown) is mounted is arranged at a position behind the fixed lens group 24a.

In other words, the image pickup device includes the reflective optical member 21a.
It is arranged on the extension line of the optical axis of the subject light flux after being bent by, and at a position that can receive the subject light flux after passing through the photographing optical system.

A connector portion 28 is provided at the end of the image pickup substrate 28.
a is mounted, and the image pickup board 28 is mounted on the main circuit board 15 on which an image signal processing circuit and the like are mounted via a flexible printed board 28b and the like connected to the connector portion 28a.
Is electrically connected to.

The reflective optical member 21a is fixedly held at a predetermined position on the upper surface of the base 25 by a prism frame 21 which is a frame fixed near one end of the base 25. The fixed lens group 24a is fixedly held at a predetermined position on the upper surface of the base 25 by a fixed frame 24 fixedly provided near the other end of the base 25.

Between the prism frame 21 and the fixed frame 24, there are two guide shafts, a drive shaft 26 and a guide shaft 2.
7 are suspended. Of the two guide shafts, the drive shaft 26 serves as a main guide shaft for guiding the movement of the variable power lens frame 22 and the correction lens frame 23 in the second optical axis O2 direction as described later. is there.

The guide shaft 27 also serves to prevent the variable power lens frame 22 and the correction lens frame 23 from rotating around the drive shaft 26, and the second optical axis O2 of both frames 22 and 23. It serves as an auxiliary guide shaft for guiding the movement in the direction.

Both ends of the drive shaft 26 are rotatably supported by the prism frame 21 and the fixed frame 24. In this case, on the side of the fixed frame 24, the drive shaft 26 penetrates through a predetermined portion of the fixed frame 24, and the tip end of the drive shaft 26 projects outside the fixed frame 24. A drive gear 26b is fixed to the protruding tip of the drive shaft 26. Both ends of the guide shaft 27 are also fixed and supported by the prism frame 21 and the fixed frame 24.

Here, the optical axis on the incident side (subject side) of the light flux in the reflective optical member 21a is indicated by reference numeral O1 as shown in FIG. 3, and the optical axis indicated by the reference numeral O1 is called the first optical axis. I shall. Further, the optical axis orthogonal to the first optical axis O1 is indicated by the reference numeral O2 as shown in FIG. 3, and the optical axis indicated by the reference numeral O2 is called the second optical axis. This second optical axis O2 is used for the above-mentioned variable power lens group 22.
The center axis of a light flux that passes through substantially the centers of a, the correction system lens group 23a, and the fixed lens group 24a and reaches the image pickup device (not shown) on the image pickup substrate 28 is shown.

The drive shaft 26 and the guide shaft 27 are composed of a variable power lens frame 22 for fixedly holding the variable power lens group 22a.
And the correction lens frame 23 that fixes and holds the correction system lens group 23a, respectively, so that they can independently move in the direction along the second optical axis O2 shown in FIG.

In this case, a through hole is formed at one end of the correction lens frame 23 along the second optical axis O2 in FIG. The drive shaft 26 is rotatably inserted through the through hole.

Further, the correction lens frame 23 is provided with a cam pin 23b at a predetermined position.
The tip end of b is cam-engaged with a cam groove 26a which is a drive groove provided in a part of the peripheral surface of the drive shaft 26. The cam groove 26a is formed over a predetermined range on the peripheral surface of the drive shaft 26 in the vicinity where the correction lens frame 23 is arranged. In this way, the cam groove 26a and the cam pin 23b of the correction lens frame 23 are engaged with each other by cam,
When the drive shaft 26 is rotated, the correction system lens group 23a moves in a predetermined direction (direction along the optical axis O2).

A bearing portion 23e having a substantially U-shaped cross section is formed at the other end of the correction lens frame 23,
The guide shaft 27 is arranged inside the bearing portion 23e. In this case, the guide shaft 27 prevents the correction lens frame 23 from rotating about the drive shaft 26 and guides the movement of the correction lens frame 23 in the direction along the second optical axis O2 in FIG. Has a role to do.

Therefore, when the drive shaft 26 is rotated by the lens frame drive mechanism (actuator 32, etc., which will be described later), the correction lens frame 23 moves in the direction along the second optical axis O2 in accordance with this rotation operation. It is supposed to do.

On the other hand, at one end of the variable power lens frame 22,
A second through hole similar to the above through hole of the correction lens frame 23 is provided.
Is provided in a direction along the optical axis O2 of the. The drive shaft 26 is rotatably inserted through the through hole.

Further, the variable power lens frame 22 is also provided with a cam pin 22b at a predetermined position.
The tip portion of b is cam-engaged with a drive groove, that is, a cam groove 26c provided in a part of the peripheral surface of the drive shaft 26. The cam groove 26c is formed over a predetermined range on the peripheral surface of the drive shaft 26 in the vicinity where the variable power lens frame 22 is arranged. Accordingly, when the drive shaft 26 is rotated by the cam engagement of the cam groove 26c and the cam pin of the variable power lens frame 22, the variable power lens group 22a moves in a predetermined direction (to the optical axis O2). It is designed to move in the direction.

At the other end of the variable power lens frame 22, a bearing portion 22e having a substantially U-shaped cross section is formed like the correction lens frame 23, and the inside of the bearing portion 22e is formed. A guide shaft 27 is arranged in the.

In this case, the guide shaft 27 prevents rotation of the variable power lens frame 22 about the drive shaft 26 as a rotation center, and the direction of the variable power lens frame 22 along the second optical axis O2 in FIG. It serves as a guide to travel to.

Therefore, when the drive shaft 26 is rotated by a predetermined lens frame drive mechanism (actuator 32, etc., which will be described later), the variable magnification lens frame 22 follows the second optical axis O2 in accordance with this rotation operation. It is designed to move in the direction.

The prism frame 21 has a reflective optical member 21a.
Are fixed by a predetermined means. The reflective optical member 21a bends a light beam (object light beam) incident from the side of the object existing at a position facing the front surface of the electronic camera 1 at a substantially right angle and guides it to the side of an image sensor (not shown). It is an optical member for.

The reflective optical member 21a attached to the prism frame 21 is formed with a reflective surface which is an inclined surface having an inclination angle of about 45 degrees with respect to each of the optical axis O1 and the optical axis O2 shown in FIG. ing. The reflecting surface faces the object located on the extension line of the optical axis O1, the lenses (22a, 23a, 24a) located on the extension line of the optical axis O2, and the image pickup device (not shown) on the image pickup substrate 28, respectively. It is arranged to.

On the other hand, in the vicinity of the drive gear 26b of the drive shaft 26, a correction lens frame 23 holding a correction system lens group 23a as a driven element and a variable power lens frame 22 holding a variable power system lens group 22a are provided. An actuator 32 for driving a lens frame driving mechanism for moving the lens frame in the direction along the optical axis O2 is provided. The actuator 32 is fixedly installed at a predetermined position on the upper surface of the base 25.

A drive gear 32a is fixed to the tip of the rotary shaft of the actuator 32. This drive gear 3
2a is in mesh with the drive gear 26b of the drive shaft 26.
Therefore, the driving force of the actuator 32 is thereby transmitted to the drive shaft 26, and the drive shaft 26 can be rotated in a predetermined direction.

When the drive shaft 26 rotates, the correction lens frame 23 and the cam groove 26c of the drive shaft 26 change due to the action of the cam groove 26a of the drive shaft 26 and the cam pin 23b of the correction lens frame 23. The zoom lens frame 22 is moved in the direction along the optical axis O2 (the direction of arrow X shown in FIG. 3) by the action of the cam pin 22b of the zoom lens frame 22.

On the other hand, the ND filter unit 3 is disposed at a predetermined position near the reflective optical member 21a as described above. This ND filter unit 3
Is configured to appropriately cover the incident surface of the light flux on the reflective optical member 21a, that is, the frontmost surface of the photographing optical system with one or both of a plurality of (two in the present embodiment) ND filters 61aa and 61ab. It is for. Here, the two ND filters 61aa and 61ab are provided so that each of them can move independently.

That is, the ND filters 61aa and 61ab
Are fixed by a means such as bonding at a predetermined position of the corresponding ND filter frame 61. The ND filter frame 61 is made of a substantially rectangular plate-shaped member, and has a hole 61b of the same shape formed on substantially the entire surface. ND filters 61aa and 61a so as to cover the hole 61b.
b is fixed to each frame.

Thus, the ND filters 61aa and 61a are
ab is a plurality of NDs each of which is a separate member
When the ND filters 61aa and 61ab are held by the filter frame 61 and are arranged on the optical path of the photographing optical system, the light flux passing through the ND filters 61aa and 61ab passes through the ND filter frame 61 (the hole 61b thereof). Then, the irradiation is made to the rear side of the frame 61.

The two ND filter frames 61 are arranged in such a manner that they are laminated in the direction along the optical axis O1 of the subject light flux incident on the reflective optical member 21a, and each of the frames 61 is guided by the filter frame. It is held so as to be independently slidable by the plate 62. In this case,
Each of the ND filter frames 61 can independently move independently in the arrow X direction shown in FIG. 3, that is, in the direction along the optical axis O2 of the photographing optical system.

The filter frame guide plate 62 is composed of a pair of members arranged so as to face each other at a predetermined position adjacent to the side surface of the lens unit 2. In this case, the base portion 62b of the filter frame guide plate 62 is fixed to the upper surface of the base 25 by fastening means such as screws.

2 and 3, only one filter frame guide plate 62 of the lens unit 2 is shown in FIG. 2 and FIG. It is assumed to be formed, and its illustration is omitted.

A plurality of guide rails 62a are formed on the filter frame guide plate 62 provided so as to face each other with the lens unit 2 interposed therebetween. This guide rail 62
“A” is provided to guide the movement of the ND filter frame 61 in a predetermined direction, and is formed on each of the surfaces of the filter frame guide plate 62 facing each other.

The guide rail 62a is a groove extending in the direction along the optical axis O2 of the photographing optical system, that is, in the direction of arrow X shown in FIG. A plurality of such grooves are formed in the direction along the upper axis O1, that is, the number of ND filter frames 61 arranged. Both ends of the ND filter frame 61 on the short side are slidably held by the guide rail 62a. As a result, the ND filter frame 61 is held by the filter frame guide plate 62 and moves only in the direction along the optical axis O2 (direction of arrow X).

The plurality of ND filter frames 61 are adapted to be driven by a filter frame driving linear actuator 63 which is provided separately for each ND filter frame 61. The filter frame driving linear actuator 63 is fixed to a predetermined portion of the filter frame guide plate 62.
A hook portion is formed on the drive shaft of the linear movement actuator 63 for driving the filter frame. This hook is
The ND filter frame 61 is locked in a hole 61c provided in a predetermined portion near one edge of the frame 61.

The filter frame driving linear actuator 63 is driven by a predetermined instruction signal from a control circuit (not shown) mounted on the circuit board (15; see FIG. 2). The drive shaft of the linear movement actuator 63 for driving the filter frame is indicated by an arrow X in FIG.
It is movable in any direction. That is, when the linear movement actuator 63 for driving the filter frame is driven in response to the predetermined instruction signal, the drive shaft thereof moves in the direction of arrow X2 in FIG. 3, that is, moves the ND filter frame 61 to the predetermined retracted position. The driving force in the pulling direction is applied.

Therefore, when the linear movement actuator 63 for driving the filter frame is driven in response to the predetermined control signal for moving the ND filter frame 61, the ND filter 61aa or the ND filter 61ab is moved to the ND filter 61a. The position indicated by the two-dot chain line, that is, the position where the front surface of the reflective optical member 21a is covered is moved to the retracted position (the position indicated by the solid line in FIG. 2) for retracting. That is, the linear movement actuator 63 for driving the filter frame is a driving unit that constitutes a part of a moving unit for moving the ND filter frame 61 in a predetermined direction, that is, between the use position and the retracted position of the ND filter frame 61. Has become.

As described above, a plurality of linear filter actuators 63 for driving the filter frame are also provided so as to correspond to the plurality of ND filter frames 61. In this case, each of the plurality of filter frame driving linear actuators 63 is driven and controlled independently by the control circuit. This allows
Each of the plurality of ND filter frames 61 can also move independently.

On the other hand, the ND filter frame 61 has substantially the same hole 61 in the vicinity of the side edge portion on the opposite side to the part different from the above-mentioned hole 61c, that is, the part where the hole 61c is provided.
d is provided. One end of the elastic coil spring 64 is locked in the hole 61d. This coil spring 6
The other end side of 4 is locked to a fixing member (not shown) on the electronic camera 1 side to which the present lens unit 2 is applied.

As a result, the ND filter frame 61 is normally urged in the direction of arrow X1 shown in FIG. 3 in a normal state. In other words, the ND filter frame 61 is arranged at a use position where the front surface of the reflective optical member 21a is always covered with the ND filters 61aa and 61ab in a normal state.

A plurality of coil springs 64 are provided corresponding to each of the plurality of ND filter frames 61. This is the same as the reason why a plurality of filter frame driving rectilinear actuators 63 are provided. That is, the coil springs 64 are arranged corresponding to the respective ND filter frames 61 so that the respective ND filter frames 61 can be independently moved and controlled.

Further, the coil spring 64 and the linear movement actuator 63 for driving the filter frame are provided only on the filter frame guide plate 62 shown in FIG.

That is, the other guide filter frame (not shown in FIG. 3) is provided with guide rails (62a) for guiding the ND filter frame 61, and the guide filter (62a) shown in FIG. Although similar to the frame guide plate 62, although not shown in FIG. 3, the filter frame frame guide plate of the present invention is not provided with the linear actuator 63 for driving the filter frame, nor is the coil spring 64 provided.

As described above, when the drive control is performed so that the corresponding plurality of ND filter frames 61 are moved in the predetermined direction (arrow X2 direction) by the plurality of filter frame driving linear actuators 63, each ND filter frame 61 is moved.
The (ND filters 61aa, 61ab) can be arranged at the use position. The state at this time is referred to as a use state.

In this used state, the ND filter 6 concerned
The light flux reduced by 1aa and 61ab is guided to the inside of the lens unit 2, passes through the photographing optical system, and reaches the image sensor.

Further, the corresponding plurality of ND filter frames 61 are controlled to move in a predetermined direction (arrow X2 direction) by the plurality of filter frame driving linear actuators 63, and are controlled to maintain their positions. ,
One or both of the ND filters 61aa and 61ab are at the positions indicated by the solid line in FIG. 2, that is, at the positions retracted from the above-mentioned use positions, and the optical axis of the subject light flux after the incident light flux is bent by the reflective optical member 21a. In the direction along the O2 (the direction of travel of the light flux), when it is arranged at a retracted position which is a predetermined position closer to the reflective optical member 21a than the image sensor, this state is referred to as a retracted state. In this retracted state, a light flux having a normal incident amount is guided to the image pickup element inside the lens unit 2.

As described above, in the ND filter unit 3 of this embodiment, two ND filters 61 are used.
It is configured by including aa and 61ab. And each ND
The filters 61aa and 61ab are two ND filter frames 6 arranged so that they can move independently of each other.
1 is fixed to each.

Therefore, the two ND filters 61a are
By controlling the combination in which a.61ab is arranged on the optical path of the photographic optical system, the incident light amount can be controlled under a plurality of conditions.

For example, when the ND filter 61aa and the ND filter 61ab have different concentrations, when only the ND filter 61aa is used,
When using only the ND filter 61ab, when using any of the ND filters 61aa and 61ab,
When neither of the ND filters 61aa and 61ab is used, it is possible to set a plurality of conditions for the amount of incident light by performing each control of.

It is well known that a general image pickup device used in a conventional electronic camera loses the sensitivity obtained by controlling the amount of transmitted light of about minus (−) 5 EV. Therefore, the ND filters 61aa and 61a
If the density of each of the ND filters 61aa and 61ab is set so that the light-attenuating effect when using both ab and ab at the same time is greater than minus 5 EV,
The D filters (61aa, 61ab) can also be configured to function as shutter means for blocking the incident light flux.

In this way, the ND filter 61aa.6
Since the two filter frames 61 provided with 1ab are configured so that they can be independently moved as described above, for example, only one of them can be set to the use position, and the two filter frames can be used. 61 can be placed in the use position at the same time, and two filter frames 6 can be placed.
1 can be placed in the retracted position at the same time.

In this case, the same time means that drive control is performed so that the two filter frames 61 are consequently arranged at the same position. In other words, it is not limited to the means for controlling the two filter frames 61 to move together (simultaneously) at the same timing in time, and apart from this, the two filter frames 6 at different timings in time.
You may control so that 1 may be moved at different times.

That is, finally, the two filter frames 61 are
Both of them may be arranged at the same position of either the use position or the retracted position, and the drive control may be performed so that the position is maintained.

The operation of the ND filter unit 3 among the operations of the above-described electronic camera 1 configured as described above will be described below.

In the normal state of the ND filter unit 3 in the electronic camera 1, each ND filter frame 6 is
1 is arranged in a use position that covers the front surface of the photographing optical system by the action of the coil spring 64.

When the user performs a predetermined operation using a predetermined operation member (not shown) in this state, a predetermined instruction signal is generated by this operation. Upon receipt of this instruction signal, a control circuit (not shown) mounted on the main circuit board 15 controls the drive of the ND filter unit 3, and one or both of the ND filter frames 61 is shown in FIG. It will be moved in the direction of arrow X2.

Here, the instruction signal generated by the predetermined operation is, for example, two ND filters 61aa and 61a.
An instruction signal corresponding to an operation performed to use only one desired one of b, two ND filters 61aa
An instruction signal corresponding to an operation when both 61ab are not used.

Both ND filters 61aa.6
When it is desired to use 1ab, the linear movement actuator 63 for driving the filter frame is not driven, and the initial state is maintained.

That is, the initial state in which the two ND filter frames 61 are both in the use position (the position indicated by the chain double-dashed line in FIG. 2).
In, the user performs a predetermined operation for using only the desired one of the two ND filters 61aa and 61ab, whereby a predetermined instruction signal is generated. Then, in response to this, the control circuit controls the drive of the linear movement actuator 63 for driving the filter frame. That is, the drive control of the filter frame drive linear actuator 63 is performed so that the ND filter frame 61 corresponding to the ND filter that is not desired to be used moves from the use position to the retracted position.

In this case, the driving shaft of one of the driven filter frame driving rectilinear actuators 63 is N.
It acts so as to move the D filter frame 61 in the direction of arrow X2 in FIG. As a result, only the corresponding ND filter frame 61 moves in the same direction (the arrow X2 direction) against the biasing force of the coil spring 64. And moved N
When the D filter frame 61 reaches the predetermined retracted position, the control circuit keeps this state until it receives the next predetermined instruction signal (for example, an instruction signal to move from the retracted position to the use position). Then, the drive control of the linear actuator 63 for driving the filter frame is performed.

When neither of the ND filters 61aa and 61ab is used, the control circuit drives any of the corresponding filter frame driving linear actuators 63 to retract the two ND filter frames 61 together. It is moved to the position and control is continued to maintain that state.

On the other hand, when one or both of the two ND filter frames 61 are in the retracted position shown in FIG. 2, the user needs to move the ND filter frame 61 in the retracted position to the use position. When a predetermined operation is performed and an instruction signal for instructing the operation is generated, the control circuit receives the instruction signal and controls the drive of the filter frame drive linear actuator 63 to release the drive state. Then, the ND filter frame 61 in the retracted position moves in the direction of the arrow X1 in FIG. 3 by the action of the coil spring 64, reaches the predetermined use position, and is held at that position.

Thus, in the ND filter unit 3 of the lens unit 2 of this embodiment,
By allowing a user of the electronic camera 1 to operate a predetermined operation member as necessary, one or both of the ND filters 61aa and 61ab desired to be used can be moved to a use position and a retracted position. There is. As a result, a switching mechanism that switches the light amount of the light flux incident on the photographing optical system and the image sensor of the electronic camera 1 is realized.

As described above, according to the first embodiment, the ND filter unit 3 and its driving means are efficiently arranged in the vicinity of the lens unit 2 without obstructing the optical path of the photographing optical system. While ensuring that the ND filter 6 is in the use position, the front surface of the reflective optical member 21a is surely covered.
One or both of 1aa and 61ab are arbitrarily arranged, and the ND filters 61aa and 61ab are in this use position.
It is possible to configure a lens frame device (lens unit 2) including the ND filter unit 3 in which one or both of them can be arbitrarily moved to the retracted position retracted from the optical path.

That is, the ND filters 61aa and 61a
By arranging these components efficiently while having the ND filter unit 3 which is a switching mechanism of b and the driving means thereof, it is possible to contribute to downsizing of the entire lens frame device and to apply the electronic camera. It can also contribute to miniaturization of itself.

Further, an image pickup device is provided on the optical axis O2 of the light flux of the subject after being bent by the reflection optical member 21a, and the retracted position of the ND filter frame 61 is set in the direction along the optical axis O2 rather than the image pickup device. Since it is set at a predetermined position close to the reflective optical member 21a, the ND filter unit 3 can be efficiently arranged in the vicinity of the lens unit 2. Therefore, although the filter frame 61 is provided with the ND filter unit 3 configured to be movable, the lens unit 2 can be prevented from increasing in size. Further, it becomes easy to prevent the electronic camera 1 using the same from becoming large.

Since the plurality of ND filter frames 61 are arranged so as to be laminated in the direction along the optical axis O1 of the light beam incident on the reflective optical member 21a, it is possible to prevent the lens unit 2 from becoming large.

Since the two ND filter frames 61 can both be arranged at the use position at the same time, the ND filter frames 61 can be arranged at the use position in combination with each other. Therefore, it is possible to easily obtain different types of effects by combining two ND filters in addition to the two types of ND filters 61aa and 61ab provided.

Since the independent linear drive actuator 63 for driving the filter frame is provided in association with each of the two ND filter frames 61, each of the ND filter frames 61 can be moved independently and each ND filter frame 61 can be moved. Each of the filter frames 61 can be arbitrarily arranged at the use position or the retracted position.

In the first embodiment described above,
The ND filter unit 3 has two ND filters 6
Although 1aa and 61ab are configured to be independently movable, the present invention is not limited to this, and it is easily possible to similarly dispose ND filters having different concentrations. Therefore, in this case, it is possible to set a condition for a larger amount of incident light.

Next, regarding the second embodiment of the present invention,
This will be described below. FIG. 4 is an exploded perspective view showing main components of a lens frame device (lens unit) according to a second embodiment of the present invention.

The lens unit 2 of this embodiment and the electronic camera to which the lens unit 2 is applied have the same basic structure as that of the lens unit 2 of the first embodiment described above, and the ND filter unit 3A is used. The only difference is the configuration. Therefore, the same components as those in the above-described first embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted, and only different portions will be described in detail below with reference to FIG. 4. 1 and 2 for the schematic configuration of the entire electronic camera to which this lens frame device is applied.

The structure of the ND filter unit 3A provided in the vicinity of the lens unit 2 of this embodiment is basically the same as that of the first embodiment described above as shown in FIG.
It is substantially the same as the D filter unit 3.

That is, in the ND filter unit 3 of the first embodiment described above, two ND filter frames 61 of exactly the same configuration are slidably held by the filter frame guide plate 62. , The two ND filter frames 61 have different types of ND filters 61.
The aa and 61ab are fixed.

On the other hand, the ND filter unit 3A of the present embodiment is different in that one of the two plate-shaped members is replaced with the light-shielding frame 61A which is the protective cover member.

That is, in the ND filter unit 3A of this embodiment, the N in the first embodiment described above is used.
ND filter frame 6 having exactly the same configuration as D filter frame 61
1 and a light-shielding frame 61A which is a plate-shaped member having the same shape and size as the ND filter frame 61 and having no hole 61b.
It is configured with.

The ND filter frame 61 and the light shielding frame 61
A is the same as that of the above-described first embodiment in that all of A are slidably held by the filter frame guide plate 62, and the driving means thereof is also the above-described first embodiment. It is similar to the form.

The light-shielding frame 61A protects the front surface of the photographing optical system, that is, the front surface of the reflective optical member 21a, and shields the light flux incident on the reflective optical member 21a by being arranged at a predetermined use position. It is provided as a protective cover member for various purposes.

The light shielding frame 61A is arranged on the side close to the lens unit 2, and the ND filter frame 61a to which the ND filter 61a is fixed is located on the side away from the lens unit 2, that is, in the present embodiment. The lens unit 2 is arranged at a predetermined position on the outer surface side.

The reason why such an arrangement is made is as follows. FIG. 5 is a member layout diagram conceptually showing the layout of main components of the lens unit and the ND filter unit, showing the basic configuration of the present embodiment.

FIG. 6 shows the basic construction of the lens frame device according to the first and second embodiments of the present invention, and conceptually shows the arrangement of the main constituent members of the lens unit and the ND filter unit. FIG.

First, the lens unit 2 constructed based on the basic concept of the present invention, including the above-described first embodiment.
The main constituent members of the ND filter unit 3 are shown in FIG.
As shown in.

That is, the lens unit 2 includes the reflective optical member 21a, the zoom lens group 22a, and the correction lens group 23a.
The ND filter unit 3 includes an image pickup optical system including the fixed lens group 24a and the like, and the image pickup element 30. The ND filter unit 3 includes an ND filter 61a.

The reflection optical member 21a is a bending optical system and is arranged so as to bend the incident optical axis O1 at a substantially right angle. The optical axis O2 of the light flux after being bent by the reflection optical member 21a. The image pickup device 30 is provided on the extension line of. Thereby, the reflective optical member 2
The light flux incident from 1a is guided to the light receiving surface of the image sensor 30.

Here, for example, when there is only one ND filter 61a movably provided in the use position and the retracted position, when the ND filter 61a is arranged in the retracted position shown in FIG. The light flux that enters from the front surface of the member 21a and is reflected by the reflecting surface 21aa thereof travels in the direction along the optical axis O2.
The light flux also includes a light beam traveling toward the window of the ND filter 61a at the retracted position, as indicated by reference numeral O3 in FIG.

Then, after being reflected by the ND filter 61a, the light ray O3 may enter the image pickup optical system again and reach the image pickup element 30 as shown by reference numeral O4 in FIG. Therefore, it can be said that the light ray O4 that follows such a locus is a harmful light ray that adversely affects the image to be acquired by the image sensor 30.

Therefore, in the ND filter unit 3A in the present embodiment, as shown in FIG. 5, the light shielding frame 61A is slidably arranged in the direction along the optical axis O2 on the side close to the lens unit 2. When the ND filter 61a is placed at the retracted position, the light shielding frame 61A is also placed at the retracted position.

As described above, when the light shielding frame 61A is provided and the ND filter 61a is disposed at the retracted position, the surface of the ND filter 61a on the side facing the lens unit 2 is disposed at the position covered with the light shielding frame 61A. It is possible to suppress the generation of the harmful ray O4 described above.

Therefore, for this reason, at least the inner surface of the light-shielding frame 61A, that is, the bottom surface of the lens unit 2 facing the photographing optical system, is subjected to antireflection treatment such as black coating.

Thus, in the present embodiment,
The light shielding frame 61A is used to suppress the effect of the harmful light O4,
This suppresses deterioration of the image to be acquired by the image sensor 30.

The light-shielding frame 61A is moved in the direction of the arrow X1 in FIG. 5 as described above, and when the light-shielding frame 61A is placed in the use position indicated by the chain double-dashed line in FIG.
It serves to completely block the light flux (light flux along the optical axis O1) incident from the front surface of 1a and to protect the front surface of the reflective optical member 21a.

As described above, according to the second embodiment, one of the plurality of ND filter frames is replaced with the light shielding frame 61A, and the light shielding frame 61A is arranged at the use position. While protecting the front surface of the photographing optical system and blocking the incident light flux, when the other ND filter frame 61 is used in the retracted position, the light shielding frame 61 is used.
By arranging A also in the retracted position, it is possible to prevent the reflected light flux generated inside the photographing optical system from being reflected by the ND filter disposed in the retracted position and reaching the image sensor. Therefore, this makes it possible to suppress the adverse effect of harmful rays and obtain a better image.

The light-shielding frame 61A is provided as a protective cover member for protecting the front surface of the photographing optical system (reflection optical member 21a) as described above. You may make it serve as the shutter member for shading.

In this case, the light-shielding shutter of the image pickup device is, for example, a shutter device for controlling the exposure time, or an image pickup device light-shielding shutter device for suppressing smear generated when the signal charge of the image pickup device is transferred. Is.

Thus, if one of the two plate-shaped members, that is, the light-shielding frame 61A functions as a light-shielding shutter member, it is necessary to separately provide a shutter means inside the photographing optical system. Since it is eliminated, it is possible to contribute to downsizing of the lens unit 2 itself. Further, it becomes easy to prevent the electronic camera 1 to which this is applied from becoming large.

Next, regarding the third embodiment of the present invention,
This will be described below. FIG. 7 is an exploded perspective view showing main components of a lens frame device (lens unit) according to a third embodiment of the present invention.

The basic structure of the lens unit 2 of this embodiment and the electronic camera to which the lens unit 2 is applied is the same as the above-mentioned first and second embodiments.
The lens unit 2 has the same configuration as the lens unit 2 of the second embodiment, and only the configuration of the ND filter unit 3B is different. Therefore, the same configurations as those of the above-described first and second embodiments will be denoted by the same reference numerals and detailed description thereof will be omitted, and only different portions will be described in detail below with reference to FIG. 7. 1 and 2 for the schematic configuration of the entire electronic camera to which this lens frame device is applied.

The structure of the ND filter unit 3B provided in the vicinity of the lens unit 2 of this embodiment is basically the same as that of the second embodiment described above, as shown in FIG.
It is substantially the same as the D filter unit 3A.

That is, in the ND filter unit 3A of the second embodiment described above, the light shielding frame 61A of the two plate members of the ND filter frame 61 and the light shielding frame 61A is arranged on the side close to the lens unit 2. is doing.

On the other hand, in the ND filter unit 3B of this embodiment, the ND filter frame 61 is arranged on the side close to the lens unit 2, and the light shielding frame 61A is arranged on the side separated from the lens unit 2. The only difference is that The other components are exactly the same as those in the second embodiment described above. The operation in this case is also exactly the same as that of the second embodiment described above.

Even with such a structure, the same effect as that of the above-described third embodiment can be obtained.

Further, since the plate-shaped member arranged on the outermost surface side of the two plate-shaped members functions as a protective cover member for protecting the front surface of the reflective optical member 21a, the photographing optical system. It is not necessary to separately provide a protective cover member that protects the outside. Therefore, it is possible to contribute to downsizing of the lens unit 2 itself. Also,
It is possible to easily prevent the electronic camera 1 to which this is applied from becoming large.

[0155]

As described above, according to the present invention, in a lens frame device having a bending optical system, a plurality of optical members (ND filters, etc.) and a desired optical member among the plurality of optical members are provided. (EN) Provided is a lens frame device which realizes downsizing by efficiently arranging a filter unit composed of structural members such as a switching mechanism for appropriately arranging it so as to be arranged on the optical path of a photographing optical system inside or near the device. You can

Further, by applying the lens frame device miniaturized in this manner, it is possible to provide an electronic camera capable of maintaining the miniaturization while realizing the multi-functionality.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external appearance of an electronic camera including a lens frame device according to a first embodiment of the present invention.

FIG. 2 is a perspective view schematically showing main internal components of the electronic camera shown in FIG.

3 is an exploded perspective view showing main components of a lens frame device (lens unit) of the present embodiment applied to the electronic camera of FIG.

FIG. 4 is an exploded perspective view showing main components of a lens frame device (lens unit) according to a second embodiment of the present invention.

5 shows a basic configuration of the lens frame device of FIG.
FIG. 6 is a member layout diagram conceptually showing the layout of main constituent members of the lens unit and the ND filter unit.

FIG. 6 shows a basic configuration of a lens frame device according to the present invention,
FIG. 6 is a member layout diagram conceptually showing the layout of main constituent members of the lens unit and the ND filter unit.

FIG. 7 is an exploded perspective view showing main components of a lens frame device (lens unit) according to a third embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electronic camera 2 ... Lens unit (mirror frame device) 3.3A / 3B ... ND filter unit 21 ... Prism frame 21a ... Reflective optical member (reflection member) 21aa ... Reflective surface (reflection member) 22 Magnification changing lens frame 22a Magnification changing lens group 23 Correction lens frame 23a Correction lens group 24 Fixed frame 24a Fixed lens group 25 Base 28 Imaging board 30 ... image pickup element 61 ... ND filter frame (plate member) 61A ... light-shielding frame (plate member) 61aa / 61ab ... ND filter 62 ... filter frame guide plate 63 ... linear actuator for driving filter frame (actuator, Moving means) 64 ... Coil spring (moving means)

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03B 17/17 G03B 17/17 5C022 19/02 19/02 H04N 5/225 H04N 5/225 D // H04N 101: 00 101: 00 (72) Inventor Toshihiro Nakao 2-43-2 Hatagaya, Shibuya-ku, Tokyo Within Olympus Optical Co., Ltd. (72) Inventor Go Togawa 2-43-2 Hatagaya, Shibuya-ku, Tokyo Ori F-Term (Reference) in Hempus Optical Industry Co., Ltd. QA46 RA41 RA42 RA43 2H100 AA01 AA31 AA32 AA33 AA61 BB05 BB06 CC07 EE06 2H101 BB03 BB05 EE02 EE51 EE53 EE56 EE60 EE62 EE63 5C022 AA13 AC41 AC54 AC55 AC 78

Claims (10)

[Claims] 1. An image pickup optical system including a reflecting member that bends an incident light beam, and a cover unit that selectively shields or exposes an incident surface of the subject light beam in the reflecting member. The reflection member is a plate-shaped member, and these plate-shaped members are provided so as to be able to move independently of each other, and are the use position located on the front surface of the reflection member and the position retracted from the use position. A lens frame device, comprising: a moving unit that moves the cover unit between a retracted position that is separated in a direction in which the incident light flux advances after being bent by the light flux. 2. An image pickup device, which receives the subject light flux and performs photoelectric conversion, is further provided on the optical axis of the subject light flux after being bent by the reflection member, and the retracted position of the cover means is the reflection member. The lens frame device according to claim 1, wherein the lens frame device is set at a position closer to the reflecting member than the image pickup element in a direction along the optical axis of the light flux after being bent by. 3. The plate-like member of the cover means is arranged so as to be laminated in a direction along an optical axis of a light flux incident on the reflecting member. The lens frame device according to 2. 4. The moving means is capable of arranging at least two or more plate-shaped members of the plurality of plate-shaped members at a use position at the same time. The lens frame device according to claim 3. 5. The lens frame according to claim 1, wherein the moving means includes actuators which are independent of each of the plurality of plate-shaped members. apparatus. 6. The lens frame device according to claim 1, wherein at least one of the plurality of plate-shaped members is an ND filter. . 7. The plate-shaped member arranged on the outermost side of the plurality of plate-shaped members is a protective cover member for protecting the front surface of the reflection member.
The lens frame device according to any one of 2, 3, 4, 5, and 6. 8. The light shielding shutter member according to claim 2, wherein at least one of the plurality of plate members is a light shielding shutter member. Lens frame device. 9. The light shielding shutter member is arranged at a position closest to the reflecting member among the plurality of plate-shaped members, and another plate-shaped member is arranged at a retracted position together with the light shielding shutter member. At times, the light shielding shutter member covers the surface of the other plate-shaped member facing the photographing optical system, so that the other plate-shaped member is not exposed to the photographing optical system. 9. The method according to claim 8, wherein
The lens frame device described in 1. 10. Claims 1, 2, 3, 4, 5, 6, 7
An electronic camera comprising the lens frame device according to any one of 8 and 9.