JP2002258132A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera which realizes thickness reduction and miniaturization while blocking unnecessary rays and forming a good image of a subject in a camera which has a deflecting optical system including a reflecting means. SOLUTION: The camera is provided with a first lens group 14a on which luminous flux is made incident, a reflecting means 33 which reflects light passing the first lens group 14a in a right-angle direction to the optical axis, a first diaphragm means 41 disposed in the vicinity of the lens of the first lens group closest to the reflecting means, a second lens group 14b on which light reflected by the reflecting means is made incident, at least one of a second diaphragm means 42 which is disposed between the first and second lens groups so as to interrupt unnecessary rays which pass outside the position at which the rays of the outermost peripheries of both the luminous flux which is directed from the 1st lens group to the reflecting means and the luminous flux which is directed from the reflective means to the 2nd lens group come to cross and an unnecessary ray reflection preventing means (33b) to prevent reflection by the regions other than the incidence region of the luminous flux made incident on the reflecting means, and a third diaphragm means 43 disposed in the vicinity of the lens of the 2nd lens group closest to the reflecting means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly, to a camera having a photographing optical system provided with a reflection means for refracting a light beam from a subject.

[0002]

2. Description of the Related Art Heretofore, a subject image obtaining means in which a subject image formed based on a light beam from a subject (hereinafter, referred to as a subject light beam) incident on a photographing optical system including a plurality of lens groups is arranged at a predetermined position. , For example, a charge-coupled device (CC
D; a desired subject image is obtained by forming an image on a light receiving surface of an image sensor such as a Charge Coupled Device) or a photographic film so that the image can be recorded on a predetermined recording medium in a predetermined form. , A so-called digital still camera or digital video camera, a photographic camera, a movie camera, or the like is generally put into practical use and widely used.

[0003] Such a conventional camera is usually provided with a photographic optical system comprising a plurality of lenses and the like in order to form a subject image at a predetermined position.

In a photographing optical system of a conventional camera, for example, a light beam of a subject which enters the camera via a plurality of lenses is guided to a light receiving surface of a predetermined subject image acquiring means such as an image pickup device or a photographic film. For this purpose, a predetermined reflecting means such as a reflecting mirror is arranged in the optical path, and the optical path of the subject light beam is bent in a predetermined direction, for example, a direction substantially perpendicular to the incident optical axis. Various forms are generally known. Among them, a camera having a photographing optical system to which a so-called bending optical system is applied as described above is disclosed in, for example, Japanese Patent Application Laid-Open No. 9-281.
Various proposals have been made in Japanese Patent Application Laid-Open No. 578 and Japanese Patent Application Laid-Open No. 9-163206.

In the cameras disclosed in Japanese Patent Application Laid-Open Nos. 9-281578 and 9-163206, the optical axis of the subject light beam is substantially perpendicular to the optical path of the photographing optical system through which the subject light beam passes. By arranging the reflecting means that bends in the direction, it is possible to reduce the size of the camera itself while securing a necessary optical path length.

As described above, adopting a so-called bending optical system in which reflecting means and the like are arranged in the optical path of the photographing optical system of the camera is a very advantageous means for realizing miniaturization of the camera itself. I can say.

[0007]

However, in the photographing optical system employing the above-described bending optical system, the incident light beam of the subject is reflected by an inner wall surface of a holding member or the like holding a constituent lens. Unnecessary rays such as internal reflection, oblique rays entering the lens closest to the subject from an extremely oblique direction, and rays not reflected in a prescribed direction among rays reflected by the reflection unit are determined by a predetermined amount. It is configured to easily reach the imaging position.

[0008] Therefore, these unnecessary light rays cause noise such as ghosts and flares in the acquired image, which causes image degradation. For this reason, in a photographing optical system of a camera that includes a so-called bending optical system, means (an unnecessary light beam preventing means) for blocking or preventing unnecessary light rays that can cause image quality deterioration is required. .

However, neither JP-A-9-281578 or JP-A-9-163206 does not disclose the unnecessary light preventing means and the like. Therefore, it is considered that, in the related art, in the photographing optical system including the bending optical system, sufficient consideration has not been given to unnecessary light rays.

That is, for example, in a general photographing optical system of a conventional camera, which has no reflecting means and is configured such that an optical path of a subject light beam does not bend inside the photographing optical system, unnecessary light beams are not generated. It is sufficient that the aperture member for blocking or preventing is disposed at one or more locations where necessary. From this,
It is conceivable that the conventional bending optical system merely employs the same measures as the unnecessary light ray preventing means similar to the general photographing optical system configured without bending the optical path.

By the way, in a general photographing optical system,
In order to adjust the focus of the subject image so as to form an image at a predetermined position, a focus adjustment mechanism or the like is generally required. The focus adjustment mechanism is a mechanism for displacing a subject image formation position by moving a predetermined lens among a plurality of lenses constituting a photographing optical system in a direction along an optical axis.

In the photographing optical system having the above-described bending optical system, the size of the camera in the front-rear direction can be reduced.
That is, as means for realizing the thinning, a portion of the plurality of lenses constituting the photographing optical system before bending the optical path of the subject light beam, that is, the length dimension from the front lens group arranged near the subject to the reflecting means It is effective to set short.

However, in the photographing optical system having the above-described bending optical system, the focus adjustment operation is performed by moving the configuration of the front lens group disposed before the optical path of the subject light beam is bent in the optical axis direction. If this is done, the number of lens components and the number of lens groups will increase. Therefore, there is a problem that it is difficult to reduce the thickness of the camera by such means.

Therefore, in order to reduce the set size of the camera in the front-rear direction, the lens configuration of the front lens group is
It is desirable to configure so that the necessary light-collecting ability can be exhibited with the minimum necessary number of lenses.

In consideration of this, in a photographing optical system having a bending optical system, the relative displacement of the constituent lenses of the front lens group is fixed, and an image pickup device serving as a reflection unit and a subject image acquisition unit. A configuration is conceivable in which a focus adjustment operation is performed by displacing a distance between a predetermined member such as a photographing film.

However, in the case of a camera using an image pickup device as the subject image acquisition means, a substrate including a large number of electric components, wiring, and the like are added to the image pickup device, and these are integrally formed. It is usually formed.

Therefore, when the imaging optical system side is fixed and the imaging device is moved for the focus adjustment operation, the attachment members attached to the imaging device are also used to move the imaging device. It needs to be moved mechanically.

Also, in the case of a camera using a photographic film as the subject image acquiring means, the photographic optical system is fixed and the photographic film is moved for focus adjustment. It is necessary to mechanically move a plurality of components and the like for ensuring the flatness of the film for photographing in accordance with the movement of the film for photographing.

In consideration of these points, it is preferable that the means for performing the focus adjustment operation by displacing the position of the object image acquiring means such as the image pickup device and the film for photographing on the optical axis of the photographing optical system is preferable. It is not considered to be possible.

Incidentally, the above-mentioned Japanese Patent Application Laid-Open No. 9-281578.
In Japanese Patent Application Laid-Open No. 9-163206 and the above-mentioned Japanese Patent Application Laid-Open No. 9-163206, there is no description about a mechanism for executing a focus adjustment operation in a photographing optical system including a bending optical system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a camera having a photographing optical system having a bending optical system in which a reflecting means is arranged in the optical path of the optical system. In the above, there is provided a camera capable of forming an extremely good state of a subject image on a predetermined image forming plane by blocking unnecessary light beams unnecessary for forming a subject image among incident subject light beams. Is to do.

Further, the camera can be made thinner in the front-rear direction while employing a photographing optical system having a bending optical system,
An object of the present invention is to provide a camera having a photographing optical system that can contribute to miniaturization of the entire camera.

[0023]

To achieve the above object, a camera according to a first aspect of the present invention comprises a first lens group into which a light beam from a subject is incident, and a first lens group into which a light beam from the subject is incident. Reflecting means for reflecting transmitted light passing through the first lens group in a direction substantially perpendicular to the optical axis of the first lens group; and a position of the first lens group closest to the reflecting means. Provided on a surface of the lens disposed opposite to the reflection unit, for blocking unnecessary light beams other than light beams that contribute to forming an object image formed by a light beam from the object on an image forming surface. First aperture means;
A second lens group comprising a plurality of lenses, on which a light beam reflected by the reflecting means is incident, and located between the first lens group and the second lens group; Outer than the position where both outermost rays of the light flux for forming the subject image heading toward the reflection means and the light flux for forming the subject image heading from the reflection means toward the second lens group intersect Reflection of light rays is performed at a portion other than a portion where a light beam for forming an image of a subject incident on the second aperture means or the reflection means for blocking an unnecessary light beam passing therethrough should be incident. At least one of unnecessary light reflection preventing means for preventing, and a lens of the second lens group, which is disposed closest to the reflecting means, is provided near a surface facing the reflecting means, Characterized by comprising a third aperture means for blocking unwanted light other than contributing light to form a Utsushitai image.

Therefore, the camera according to the first invention is
After the luminous flux from the subject enters the first lens group including a plurality of lenses, the transmitted light passing through the first lens group is substantially perpendicular to the optical axis of the first lens group by the reflection unit. Reflect in the direction. In this case, the first diaphragm means is provided on a surface of the lens of the first lens group, which is located closest to the reflection means, facing the reflection means, and is formed by a light beam from a subject. Unnecessary light rays other than the light rays that contribute to forming the subject image to be formed on the image forming plane are blocked. The transmitted light reflected by the reflection means enters a second lens group including a plurality of lenses. Between the first lens group and the second lens group, a light beam for forming a subject image traveling from the first lens group to the reflecting means and the second lens group from the reflecting means The second diaphragm means for blocking unnecessary light rays passing outside the position where both outermost rays of the light flux for forming the subject image toward Any one of unnecessary light reflection preventing means provided at a part other than a part where a light beam for forming a subject image incident on the means is to be incident is provided. In addition, unnecessary light other than light that contributes to forming a subject image is provided near a surface of the second lens group, which is located closest to the reflection unit, facing the reflection unit. There is provided a third stop means for blocking light, thereby preventing reflection of light rays.

A camera according to a second aspect of the present invention includes a first lens group including a plurality of lenses and receiving a light beam from a subject, and a transmitted light incident from the subject side and passing through the first lens group. A reflecting means for reflecting light in a direction substantially perpendicular to the optical axis of the first lens group, and a reflecting means of a lens of the first lens group which is arranged closest to the reflecting means; A first diaphragm means for blocking unnecessary light rays other than light rays which are provided on the surface and contribute to forming a subject image formed by a light beam from the subject on the image forming surface; and a plurality of lenses. A second lens group on which a light beam reflected by the reflecting means is incident, and a first lens group and a second lens group;
A light beam for forming a subject image traveling from the first lens group to the reflection means and the second light beam from the reflection means.
A second diaphragm means for blocking unnecessary light beams passing outside of a position where both outermost light beams of a light beam for forming a subject image toward the lens group intersect, and the second lens A second lens for blocking unnecessary light rays other than light rays that contribute to forming a subject image, which is provided in the vicinity of the surface facing the reflection means of the lens of the group that is closest to the reflection means. (3) a diaphragm means, and a part other than a part which is provided on the reflection means and which is to receive a light beam for forming a subject image incident on the reflection means,
An unnecessary light reflection preventing means for preventing light from being reflected is provided.

Therefore, the camera according to the second invention is
After the luminous flux from the subject enters the first lens group including a plurality of lenses, the transmitted light passing through the first lens group is substantially perpendicular to the optical axis of the first lens group by the reflection unit. Reflect in the direction. In this case, the first diaphragm means is provided on a surface of the lens of the first lens group, which is located closest to the reflection means, facing the reflection means, and is formed by a light beam from a subject. Unnecessary light rays other than the light rays that contribute to forming the subject image to be formed on the image forming plane are blocked. The transmitted light reflected by the reflection means enters a second lens group including a plurality of lenses. Between the first lens group and the second lens group, a light beam for forming a subject image traveling from the first lens group to the reflecting means and the second lens group from the reflecting means A second diaphragm means for blocking unnecessary light rays passing outside the position where both outermost rays of the light flux for forming a subject image heading toward Unnecessary light reflection preventing means is provided in a part other than the part where the light flux for forming the subject image incident on the reflecting means is to be incident,
Unnecessary light rays other than the light rays that contribute to the formation of the subject image are blocked in the vicinity of the surface of the second lens group that is closest to the reflection means and that faces the reflection means. Third stop means for preventing reflection of light rays.

According to a third aspect of the present invention, in the camera according to the first aspect or the second aspect, the reflecting means is arranged only at a portion where a light beam for forming a subject image is incident. It is characterized by.

According to a fourth aspect, in the camera according to the first aspect, the second aspect, or the third aspect, the camera is disposed at a position closest to the reflecting means in the second lens group. The diameter of the lens is set to be larger than the inner diameter of the third stop means in order to prevent some light rays incident on the lens from being reflected at the outer peripheral edge of the lens.

A camera according to a fifth aspect of the present invention comprises a first lens group to which a light beam from a subject enters, and a transmitted light which enters from the subject side and passes through the first lens group. A reflecting means for reflecting the light in a direction substantially perpendicular to the optical axis of the first lens group; and a surface of the lens of the first lens group, which is located closest to the reflecting means, facing the reflecting means. A first diaphragm means for blocking unnecessary light beams other than light beams that contribute to forming a subject image formed by a light beam from the subject on the image forming surface, and a plurality of lenses; A subject located between the second lens group on which the light beam reflected by the reflecting means enters, and the first lens group and the second lens group, and traveling from the first lens group to the reflecting means; Luminous flux for forming an image And a second stop for blocking unnecessary light rays passing outside the position where both outermost rays of the light flux for forming the subject image traveling from the reflection means to the second lens group intersect. At least one of unnecessary light reflection preventing means for preventing light rays from being reflected at a portion other than a portion where a light flux for forming a subject image incident on the reflecting means provided on the reflecting means is provided. It is characterized by having.

Therefore, the camera according to the fifth aspect of the present invention
After the luminous flux from the subject enters the first lens group including a plurality of lenses, the transmitted light passing through the first lens group is substantially perpendicular to the optical axis of the first lens group by the reflection unit. Reflect in the direction. In this case, the first diaphragm means is provided on a surface of the lens of the first lens group, which is located closest to the reflection means, facing the reflection means, and is formed by a light beam from a subject. Unnecessary light rays other than the light rays that contribute to forming the subject image to be formed on the image forming plane are blocked. The transmitted light reflected by the reflection means enters a second lens group including a plurality of lenses. Between the first lens group and the second lens group, a light beam for forming a subject image traveling from the first lens group to the reflecting means and the second lens group from the reflecting means A second diaphragm means for blocking unnecessary light rays passing outside the position where both outermost rays of the light flux for forming a subject image heading toward Unnecessary light reflection preventing means is provided in a part other than the part where the light flux for forming the subject image incident on the reflecting means is to be incident,
This prevents reflection of light rays.

A camera according to a sixth aspect of the present invention comprises a first lens group to which a light beam from a subject enters, and a transmitted light which enters from the subject side and passes through the first lens group. A reflecting means for reflecting the light in a direction substantially perpendicular to the optical axis of the first lens group; and a surface of the lens of the first lens group, which is located closest to the reflecting means, facing the reflecting means. A first diaphragm means for blocking unnecessary light beams other than light beams that contribute to forming a subject image formed by a light beam from the subject on the image forming surface, and a plurality of lenses; A subject located between the second lens group on which the light beam reflected by the reflecting means enters, and the first lens group and the second lens group, and traveling from the first lens group to the reflecting means; Luminous flux for forming an image And a second stop for blocking unnecessary light rays passing outside the position where both outermost rays of the light flux for forming the subject image traveling from the reflection means to the second lens group intersect. Means, and unnecessary light reflection preventing means for preventing reflection of light rays in a portion other than a portion where a light beam for forming a subject image to be incident on the reflecting means is provided. It is characterized by.

Therefore, the camera according to the sixth invention is
After the luminous flux from the subject enters the first lens group including a plurality of lenses, the transmitted light passing through the first lens group is substantially perpendicular to the optical axis of the first lens group by the reflection unit. Reflect in the direction. In this case, the first diaphragm means is provided on a surface of the lens of the first lens group, which is located closest to the reflection means, facing the reflection means, and is formed by a light beam from a subject. Unnecessary light rays other than the light rays that contribute to forming the subject image to be formed on the image forming plane are blocked. The transmitted light reflected by the reflection means enters a second lens group including a plurality of lenses. Between the first lens group and the second lens group, a light beam for forming a subject image traveling from the first lens group to the reflecting means and the second lens group from the reflecting means A second diaphragm means for blocking unnecessary light rays passing outside the position where both outermost rays of the light flux for forming a subject image heading toward Unnecessary light reflection preventing means is provided in a part other than the part where the light flux for forming the subject image incident on the reflecting means is to be incident,
This prevents reflection of light rays.

[0033]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. According to an embodiment of the present invention, there is provided a camera in which a subject image formed based on a light beam from a subject (hereinafter, referred to as a subject light beam) incident on an imaging optical system including a plurality of lens groups and the like is arranged at a predetermined position. A desired subject image is obtained by forming an image on a light receiving surface of an image pickup device such as a charge-coupled device (CCD), which is an image obtaining means, and is recorded as image data in a predetermined form on a predetermined recording medium. It is a so-called digital still camera that is intended to be obtained.
Further, this camera has a predetermined display device so that image data of a predetermined form recorded on a recording medium can be read and displayed as an image. In the following description, it is simply referred to as a camera.

FIG. 1 is a perspective view of a camera according to an embodiment of the present invention. 2 and 3 show the arrangement of main components inside the camera according to an embodiment of the present invention. FIG. 2 shows the arrangement of members when viewed from the front side, and FIG. 3 shows when viewed from the top side. The respective member arrangements are shown.

First, the schematic structure of the camera will be described below with reference to FIGS. As shown in FIG.
The camera 1 of the present embodiment includes a front cover member 11 that covers the front side of the internal components (not shown in FIG. 1; see FIGS. 2 and 3 described later), a rear cover member 12 that covers the rear side, and a front cover member. The housing is formed by an exterior member such as a barrier member 13 slidably disposed in the direction of arrow X shown in FIG. 1 with respect to the cover member 11.

The barrier member 13 is slidably disposed within a predetermined range with respect to the front cover member 11 of the camera 1, and various types of members disposed near a substantially central portion of the front surface of the front cover member 11 are provided. It can be displaced between a shielding position that covers the front side of the component and a shooting position (a state shown in FIG. 1) that exposes the front side of the component. Also, the barrier member 13
Is a main power switch 28 (shown in FIGS. 2 and 3) which is disposed inside the camera 1 and opens and closes (turns on and off) the main power of the camera 1.
Reference). That is, by opening and closing the barrier member 13, the main power switch 28 is opened and closed (on / off) in conjunction therewith.

In the vicinity of substantially the center of the front surface of the front cover member 11, a first part of a photographic optical system constituting a part of a photographic lens unit 14 (not shown in FIG. 1; see FIGS. 2 and 3 described later). A lens 14aa, an objective lens 15a of an observation optical system forming a part of a finder unit 15 (not shown in FIG. 1, see FIGS. 2 and 3 described later), and a light emitting window forming a part of a flash light emitting device. 16 and the like are arranged.

In the front cover member 11 of the exterior member, the first lens 14aa of the photographing lens unit 14
A lens opening 11a (see FIG. 4), which is a subject light beam entrance window having an opening dimension capable of transmitting the subject light beam incident on the first lens group 14a, is formed at a predetermined position facing the first lens group 14a. The lens opening 11a is formed in an elongated substantially rectangular shape having a long side in a direction along the arrow X shown in FIG.

These components (the first lens 1)
4aa, objective lens 15a, light emission window 16, etc.)
When the barrier member 13 is at the shooting position shown in FIG.
As shown in the figure, when the barrier member 13 is displaced to the closing position while being exposed to the outside, the barrier member 13 is covered and covered by the barrier member 13 so as to be protected from the outside.

On the other hand, on the upper surface of the camera 1, a shutter release button 17 is arranged at a predetermined position near one end. The shutter release button 17 is linked to a shutter release switch (not shown) inside the camera 1. On the other hand, on the back of the camera 1, various operation members (not shown) and a display device 27 are provided.
(See FIG. 3).

Next, the arrangement of the main components disposed inside the camera 1 will be described below with reference to FIGS. The main internal components of the camera 1 are a photographic lens unit 14 including a photographic optical system and the like,
There are a finder unit 15 including an observation optical system and a plurality of electric boards.

The photographing lens unit 14 is located at a predetermined position near one end of the housing of the camera 1 and at a predetermined position near the right end when viewed from the front side of the camera 1. I have. A finder unit 15 is disposed integrally with the photographic lens unit 14 at a predetermined position above the photographic lens unit 14.

The plurality of electric boards provided inside the camera 1 include a main board 22 disposed at a predetermined position near the front of the camera 1 and a predetermined position along one side surface of the camera 1. An image pickup board 23 on which an image pickup element 23a or the like, which is a subject image acquisition unit, is mounted;
Connection board 24 for connecting between the third board 3 and the main board 22
An external interface board 25 on which various connection terminals 25a for connecting the camera 1 to external peripheral devices are mounted; and a strobe provided at a predetermined position corresponding to a substantially central portion on the back side of the main board 22. There is a power supply board 26 and the like.

The main substrate 22 is arranged at a predetermined position near the front of the camera 1 as described above, and is formed to have a cutout portion 22d in which a predetermined part is cut out. The notch 22d is provided to secure a space for disposing the photographing lens unit 14, the finder unit 15, and the like.

The memory card drive 22 is located near the end opposite to the side where the notch 22d is provided and on the board surface of the main board 22 (the front side of the camera 1).
b has been implemented. This memory card drive 22b
Is a recording medium used for storing image data and the like acquired by the camera 1 such that, for example, a thin card-shaped memory (not shown) or the like (not shown) can be detachably provided from the camera 1. It was done. The memory card drive 22b records (writes) image data in a predetermined format obtained by the camera 1 and subjected to predetermined signal processing to a card-type memory attached thereto.
And a drive device for reading image data or the like recorded in the card type memory or the like.

Further, the above-mentioned main power switch 28 is disposed on the surface of the main substrate 22 on the front surface side of the camera 1. As described above, the main power switch 28 is opened and closed (on / off) in conjunction with the movement of the barrier member 13 in the direction of the arrow X in FIG.

The imaging board 23 is provided with the camera 1 as described above.
It is arranged at a predetermined position along one side surface, and an electric member such as the image sensor 23a is mounted on the substrate surface. The imaging substrate 23 is integrated with the imaging lens unit 14 via the imaging device 23a.

The connection between the imaging board 23 and the main board 22 is made via a connection board 24. That is, the imaging board 23 and the connection board 24 are connected by a predetermined flat cable 23b or the like, while the connection board 24 and the main board 22 are provided with connection connectors 22a and 24a, respectively. , This connector 22
The imaging board 23 and the main board 22 are connected via the connection boards 24a and 24a.

On the other hand, the external interface board 25
This is a small board on which electric members such as connection terminals 25a for mounting the camera 1 and external peripheral devices via a connection cable are mounted. Here, as the external peripheral device, for example, a USB (Universal Ser
ial bus) interface, an external display device or an external recording device compatible with a video signal interface capable of receiving a video signal output, and a power supply interface capable of receiving power supply from an external power supply or the like. There is.

The external interface board 2
Reference numeral 5 is connected to the main board 22 via a cable member (not shown) such as a predetermined lead wire capable of transmitting an electric signal.

On the other hand, the strobe power supply board 26 is supplied from a power supply battery 18a housed in a battery housing 18 to be described later or an external power supply connection terminal among the connection terminals 25a mounted on the external interface board 25 described above. A power supply circuit for controlling the power to be supplied is mounted. In addition, a strobe circuit and the like for controlling the flash light emitting device are mounted on the strobe power supply board 26,
A strobe condenser 26b for storing electric power for causing the light emitting section 16 of the flash light emitting device to emit light is connected by a cable member 26a or the like.

The strobe power supply board 26 and the main board 22 have connection connectors 26c and 22 respectively.
c is provided, and both boards are connected via the connectors 26c and 22c.

A power supply battery 18 serving as a main power supply is located at a predetermined position near one end inside the housing of the camera 1 and near the left end when viewed from the front side of the camera 1.
A battery storage chamber 18 for storing a plurality of “a” is formed. The battery compartment 18 is provided with electric members (not shown) such as battery contacts for receiving power supplied from the stored power supply battery 18a. These electric members are connected to a predetermined general connection. It is connected to the above-mentioned strobe power supply board 26 via means (not shown). Thereby, the power battery 18
The power of a can be supplied to the strobe power supply board 26.

Further, a display device 27 such as a liquid crystal display (LCD) is provided at a predetermined position substantially in the center on the back side inside the housing of the camera 1, and at a predetermined position near the display device 27. A display substrate (not shown) on which a display circuit for controlling the display device 27 is mounted is provided. The display device 27 is connected to the main substrate 22 via the display substrate.

Next, the configuration of the photographing optical system disposed inside the photographing lens unit 14 in the camera 1 of the present embodiment will be described below. FIG. 4 is a diagram schematically illustrating an internal configuration of the photographing lens unit 14 of the camera 1 according to the present embodiment, and is a cross-sectional view taken along line ZZ shown in FIG. FIG. 2 shows only members related to the present invention, that is, mainly the arrangement of the photographing optical system and components disposed in the optical path thereof, and is a part that is not directly related to the present invention. By omitting illustration of some components and the like, complication of the drawing is prevented.

A photographic optical system composed of a plurality of lenses and the like is arranged inside the photographic lens unit 14 of the camera 1 of this embodiment, as shown in FIG.

This photographing optical system is a plurality of lenses and a reflection means disposed in the optical path of the lens and for bending the optical axis O of the photographing optical system in a predetermined direction at an angle of about 90 degrees (substantially right angle). It is constituted by a reflecting mirror 33 and the like.

The plurality of lenses include two lenses (a first lens 14aa and a second lens 14ab) constituting a first lens group 14a disposed at a predetermined position closer to the subject than the reflecting mirror 33, and There are four lenses (third lens 14bb and others) constituting the second lens group 14b arranged at a predetermined position closer to the image sensor 23a than the mirror 33.
In this case, of the first lens group 14a disposed closer to the subject than the reflecting mirror 33, the lens disposed on the front side of the camera 1 is the first lens 14aa. Further, the lens arranged in the position closest to the reflecting mirror 33 in the first lens group 14a is the second lens 14ab. Then, of the second lens group 14b arranged at a predetermined position on the image sensor 23a side with respect to the reflecting mirror 33, a lens arranged at a position closest to the reflecting mirror 33 is a third lens 14bb.
It is.

The first lens group 14a is held by a holding member 32. The first lens group 14a is arranged at a predetermined position inside the housing such that its optical axis is in a direction substantially orthogonal to a plane including the front surface of the camera 1. Then, the first lens group 1 held by the holding member 32
The first lens 14aa of the front cover member 11a
Is disposed immediately after the lens opening 11a.

The reflecting mirror 3 is located behind the first lens group 14a.
3 is arranged at an angle of about 45 degrees with respect to the optical axis. The reflecting mirror 33 is held from the back by a predetermined holding member (not shown). Further, the reflection surface 33a of the reflection mirror 33 is arranged toward the image sensor 23a.

Therefore, the light beam of the subject entering from the lens opening 11a passes through the first lens group 14a,
The light is reflected by the reflecting surface 33a of the reflecting mirror 33 by the reflecting action, and its optical path is bent at an angle of about 90 degrees (at substantially a right angle). As a result, the subject luminous flux advances toward the second lens group 14b, passes through the second lens group 14b, and is then guided to the light receiving surface of the image sensor 23a.

That is, the reflecting mirror 33 is provided in the optical path of the photographing optical system formed by the first and second lens groups 14a and 14b, and serves as a so-called bending optical system for bending the optical path. ing.

On the reflecting surface 33a, which is a reflecting means of the reflecting mirror 33, a portion of the subject light beam incident on the reflecting mirror 33 other than the portion to be incident is provided for preventing light rays from being reflected. An unnecessary light reflection preventing member 33b (see FIG. 5) serving as unnecessary light reflection preventing means is provided. FIG. 5 is a view showing only the reflecting mirror 33 out of the constituent members of the photographing optical system in the camera 1 of the present embodiment, and shows the side of the reflecting surface 33a of the reflecting mirror 33.

As shown in FIG. 5, in the reflecting mirror 33, the reflecting surface 33 in a predetermined range is provided at a substantially central portion of a surface facing each of the first lens group 14a and the second lens group 14b.
While a is formed, an unnecessary light reflection preventing member 33b is formed at a predetermined portion near the periphery of the present reflecting mirror 33 and at a portion other than the reflecting surface 33a. In other words, the reflecting surface 33a, which is a reflecting means of the reflecting mirror 33, is disposed only at a portion where a light beam for forming an object image (object light beam) is incident.

The vicinity of the reflecting mirror 33 and the reflecting mirror 3
A shutter stop unit 34 is provided on the optical path of the light beam bent by the shutter 3. The shutter aperture unit 34 includes a shutter member, an aperture member, and the like for controlling the amount of incident light by controlling the light flux of a subject incident on the photographing optical system.

Behind the shutter stop unit 34, a second lens group 14b is arranged. The second lens group 14b is composed of four lenses as described above, and the lenses are arranged at predetermined positions in a direction substantially orthogonal to the front surface of the camera 1. In this case, each lens is held at a predetermined position inside the lens barrel member 31.

An image sensor 23a is provided behind the second lens group 14b. The image sensor 2
3a is mounted on the imaging board 23 as described above. As a result, the luminous flux of the subject that has entered the inside of the taking lens unit 14 through the lens opening 11a is
The first lens group 14a, the reflecting mirror 33, the shutter stop unit 34, and the second lens group 14b reach the image sensor 23a, and form a subject image on the light receiving surface thereof.

The photographing optical system of the photographing lens unit 14 thus configured is provided movably in a direction along arrow X shown in FIG. 4 by a predetermined focus adjusting mechanism 45 including a motor 44 and the like. As a result, a focus adjustment operation is performed.

In this case, the image pickup device 23a and the image pickup board 23 are fixed integrally with the immovable member (frame member) of the photographing lens unit 14 inside the housing of the camera 1.

That is, in the focus adjustment operation of the camera 1 of the present embodiment, the distance between the reflecting mirror 33 and the image pickup device 23a is displaced according to the distance to the subject by using the focus adjustment mechanism 45 or the like. To do it.

That is, the reflecting mirror 33, the first lens group 14a,
A second lens group 14b and a holding member 32 for holding them;
The movable member in the photographing lens unit 14 including the lens barrel member 31 and the like is configured to move in the arrow X direction in FIG. 4 with respect to the immovable member (frame member) of the photographing lens unit 14 with the focus adjustment operation. I have.

The movable member of the photographing lens unit 14 is integrally formed, and this integrated movable member is pivotally supported by an arm 30 formed on a stationary member (frame member) of the photographing lens unit 14. The guide rod (guide shaft) 35 is suspended. An elastic member 36 such as a coil spring having elasticity is stretched between the movable member and the immovable member (frame member). Thereby, the elastic force in the direction of arrow X1 shown in FIG. 4 always acts on the movable member of the taking lens unit 14.

A focus adjusting mechanism 45 including a motor 44 for integrally moving the movable member of the photographing lens unit 14 is provided between the rear end of the lens barrel member 31 and the image sensor 23a. In response to a predetermined command signal, for example, a command signal from a shutter release switch (not shown) interlocked with the shutter release button 17, a predetermined focus adjustment operation is started.

When the photographing optical system of the photographing lens unit 14 of the camera 1 is moved in a predetermined direction for the focus adjusting operation by the predetermined focus adjusting mechanism 45, as a result, the optical axis of the first lens group 14a becomes , In a predetermined direction (the direction of arrow X in FIG. 4).

In response to this, in the camera 1 of the present embodiment, the lens opening 1 corresponding to the first lens group 14a
The opening 1a is formed so as to have an elongated, substantially rectangular shape having a long side in a direction along the arrow X. In other words, the lens aperture 11a, which is the subject light beam entrance window, has an opening dimension that allows the subject light beam incident on the first lens group 14a to pass therethrough, and the reflecting mirror 33 and the image sensor 23a that are displaced in accordance with the focus adjustment operation. In both the case where the distance between is set to the shortest distance and the case where the distance is set to the longest distance, the direction of the long side of the first lens group 14a is set so that the subject light beam can be transmitted. Is set. In FIG. 4, both the light beam L1 when the distance between the reflecting mirror 33 and the imaging device 23a is the shortest and the light beam L2 when the distance between the reflecting mirror 33 and the imaging device 23a is the longest are transmitted. What you get.

The dimension of the lens opening 11a in the long side direction is set according to the range in which the first lens group 14a moves. Generally, the amount of movement of the lens of the photographing optical system when performing the focus adjustment operation tends to be smaller as the focal length set by the photographing optical system is shorter, that is, as the angle of view is wider. In other words, it is well known that the amount of lens movement required to perform the focus adjustment operation from the infinity (∞) position of the lens to the closest position is smaller for a wide-angle lens.

When the closest distance at which the focus adjustment operation can be performed by the photographing optical system is set to a position at a certain distance, for example, when the distance is set to about 1 m,
It is also known that the focus adjustment operation from the infinity (∞) position to the closest position can be performed with a much smaller lens movement amount than when the distance is set to be shorter than this.

Therefore, in this embodiment, the optical axis O of the first lens group 14a moves in the X direction in FIG. 4 with respect to the housing of the camera 1 as described above. Considering this, it is possible to secure the necessary focusing operation of the photographing optical system while setting the lens movement amount to be sufficiently small.

By the way, the photographing optical system employing the bending optical system configured as described above forms a subject image due to the fact that the light beam reflected by the reflecting mirror 33 is reflected in an unintended direction. This is a form in which harmful rays and the like that cause ghosts and flares are easily generated without contributing to the above.

This means that the reflection mirror 3 is used as in this embodiment.
The photographic optical system employing the bending optical system having the number 3 is more likely to generate harmful rays than the conventional general photographic optical system configured so that the optical axis is linear. Some things are well known.

Therefore, in the taking lens unit 14 of the camera 1 according to the present embodiment, the following measures are taken in order to suppress harmful rays generated near the reflecting mirror 33.

That is, the surface of the second lens 14ab located closest to the reflecting mirror 33 in the first lens group 14a and facing the reflecting mirror 33 is provided with the first diaphragm means having the shape shown in FIG. A certain first anti-reflection member 41 is provided.
The first anti-reflection member 41 is formed of a circular thin piece having substantially the same diameter as the outer diameter of the second lens 14ab, and has a substantially square shape with four corners cut off at a substantially central portion thereof. An opening 41a having a shape is formed. FIG. 6 is a diagram showing the shape of the first anti-reflection member 41 when viewed from the direction of arrow B shown in FIG.

The first antireflection member 41 is an unnecessary light beam other than a light beam that should contribute to forming a subject image to be formed by a light beam from the subject on the image forming surface of the image sensor 23a. In FIG. 4, oblique light rays indicated by reference numeral W1 are blocked. The surface of the first anti-reflection member 41 is subjected to anti-reflection processing such as mat processing.

On the other hand, in the vicinity of the surface of the third lens 14bb, which is located closest to the reflecting mirror 33 in the second lens group 14b, facing the reflecting mirror 33, a third diaphragm means is provided. I have. The third diaphragm means is for blocking unnecessary light rays other than light rays that contribute to forming a subject image, for example, oblique light rays indicated by a reference sign W2 in FIG.

For this purpose, the third diaphragm means in the present embodiment regulates a part of the subject light beam reflected by the reflecting mirror 33 and controls only the light beam contributing to forming the subject image to the third lens 14bb. And a third antireflection member 43 having an opening for allowing the light to enter. The third anti-reflection member 43 includes a third lens 14bb.
Between the mirror and the reflecting mirror 33, and the third lens 14b
b is disposed near the surface on the side facing the reflecting mirror 33. The opening of the third anti-reflection member 43 has substantially the same shape as the opening 41a of the first anti-reflection member 41 described above.

In this case, the third antireflection member 43
There is a slight gap between the third antireflection member 43 and the third lens 14bb.
A part of the light beam incident on the lens 14bb may be reflected near the outer peripheral edge of the third lens 14bb to generate unnecessary diffuse reflection that does not contribute to forming a subject image.

Therefore, in the present embodiment, the diameter of the third lens 14bb (reference numeral D1 shown in FIG. 4) is determined by the inner diameter of the opening of the third diaphragm means (third antireflection member 43) (shown in FIG. 4). It is set larger than the reference sign D2). Thereby, the light beam incident on the third lens 14bb is
The light is transmitted near the center of the lens 14bb,
This prevents some incident light rays from being reflected near the outer peripheral edge of the third lens 14bb. In addition,
The surface of the third anti-reflection member 43 is also subjected to anti-reflection processing such as matting, similarly to the first anti-reflection member 41 described above.

On the other hand, a predetermined wall surface located in the space between the first lens group 14a and the second lens group 14b, that is, the outer wall surface of the holding member 32 holding the first lens group 14a, Wall 32a at a position where it can receive the reflected light flux
Is provided with a second anti-reflection member 42 as a second diaphragm means. The second antireflection member 42 intersects the outermost light rays of the subject light beam traveling from the first lens group 14a toward the reflecting mirror 33 and the subject light beam reflected by the reflecting mirror 33 and traveling toward the second lens group 14b. It is provided to block the unnecessary light beam W3 that passes outside a predetermined position (the position indicated by the symbol Q in FIG. 4).

The second anti-reflection member 42 is formed of a channel-shaped thin piece member having an opening on one side as shown in FIG. 7, and is provided with a substantially arc-shaped notch 43a from the substantially central portion to the opening. I have. In addition, FIG.
FIG. 5 is a diagram illustrating a shape of a third anti-reflection member 43 when viewed from a direction of an arrow B illustrated in FIG. 4.

The second anti-reflection member 42 formed as described above is a member other than the light beam that contributes to forming the subject image to be formed by the light beam from the subject on the imaging surface of the image sensor 23a. Unnecessary rays, for example, oblique rays indicated by reference numeral W3 in FIG. 4 are blocked. Note that the surface of the second anti-reflection member 42 is also subjected to anti-reflection processing such as matting similarly to the first anti-reflection member 41 described above.

As described above, according to the above-described embodiment, by disposing the reflecting mirror 33 on the optical path between the first lens group 14a and the second lens group 14b, the first lens group 1
The optical path of the luminous flux of the subject transmitted through the second lens group 14a is bent at a substantially right angle to the side of the second lens group 14b.
The transmitted light beam transmitted through 4b is guided onto the light receiving surface of the image sensor 23a, and an object image is formed thereon. In this case, the configuration of the first lens group 14a, which is arranged before the optical path of the light beam of the subject is bent by the reflecting mirror 33, realizes the necessary minimum light-condensing function with the required minimum number of lenses and the entire photographing optical system. To arrow X in FIG.
The camera 1 is configured so that a sufficient focus adjustment function can be secured while moving in the direction, thereby contributing to the thinning of the housing of the camera 1 in the front-rear direction, and greatly improving the portability of the camera 1. ing.

In order to block or prevent unnecessary light beams at a predetermined portion immediately before the subject light beam enters the reflecting mirror 33 and at a predetermined portion immediately after the reflected light of the subject light beam from the reflecting mirror 33 is emitted. A plurality of aperture members (the first antireflection member 41, the second antireflection member 42, and the third antireflection member 4).
In addition to the arrangement of 3), the unnecessary light reflection preventing member 33b is arranged on the reflection surface 33a of the reflection mirror 33, and a thorough measure for blocking or preventing unnecessary light is taken. Can be done easily.

Although the camera 1 in the above-described embodiment has been described by taking as an example a so-called digital still camera in which the image pickup device 23a is a subject image acquiring unit, the present invention is not limited to this. It is easily possible to apply the present invention to a general camera using a photographing film as a subject image acquiring means.

[0094]

As described above, according to the present invention, in a camera having a photographing optical system having a bending optical system in which a reflecting means is disposed in the optical path of the optical system, an object image of an incident object light beam is formed. It is possible to provide a camera capable of forming an extremely good subject image on a predetermined image forming surface by blocking unnecessary light beams unnecessary for forming the image.

Further, the camera can be made thinner in the front-rear direction while employing a photographing optical system having a bending optical system,
A camera having a photographing optical system that can contribute to miniaturization of the entire camera can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a camera according to an embodiment of the present invention.

FIG. 2 is a member arrangement diagram showing an arrangement of main components when the inside of the camera of FIG. 1 is viewed from the front side.

FIG. 3 is a member arrangement diagram showing an arrangement of main constituent members when the inside of the camera of FIG. 1 is viewed from the upper surface side.

FIG. 4 is a cross-sectional view schematically showing the internal configuration of a photographing lens unit in the camera shown in FIG.

5 is a plan view showing only a reflecting mirror out of components of the photographing optical system in the camera of FIG. 1, and showing a side of a reflecting surface of the reflecting mirror;

6 is a first view when viewed from the direction of arrow B shown in FIG. 4;
The top view which shows the shape of an anti-reflection member.

FIG. 7 is a third view when viewed from the direction of arrow B shown in FIG. 4;
The top view which shows the shape of an anti-reflection member.

[Explanation of symbols]

Reference Signs List 1 camera 11 front cover member 11a lens opening 12 rear cover member 13 barrier member 14 photographing lens unit 14a first lens group 14aa first lens 14ab 2 lens 14b second lens group 14bb third lens 15 finder unit 17 shutter release button 22 main substrate 23 imaging substrate 23a imaging device (CCD; subject image acquisition means) 26 Strobe power supply board 31 ... Barrel member 32 ... Holding member 33 ... Reflecting mirror (reflecting means) 33a ... Reflecting surface 33b ... Unnecessary light reflection preventing member (unnecessary light reflection preventing means) 35 Guide rod (guide shaft) 41 first anti-reflection member (first stop means) 42 second anti-reflection member (second stop means) 43 third anti-reflection member (first stop means) 3 of throttle means) 44 ...... motor (focusing mechanism) 45 ...... focusing mechanism

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) G03B 19/02 G03B 19/02 5C022 H04N 5/225 H04N 5/225 DF term (reference) 2H044 AD01 AG01 2H054 AA01 BB02 CD00 2H080 AA30 AA32 BB69 DD07 2H100 AA01 AA02 AA31 BB05 BB06 CC07 EE00 2H101 FF00 5C022 AB37 AC54 CA00

Claims (6)

[The claims] 1. A first lens group including a plurality of lenses, to which a light beam from a subject enters, and a transmitted light, which enters from the subject side and passes through the first lens group, is transmitted to the first lens group. A reflecting means for reflecting the light in a direction substantially perpendicular to the axis; a reflecting means provided on a surface of the first lens group, which is located closest to the reflecting means, facing the reflecting means; A first aperture unit for blocking unnecessary light beams other than a light beam that contributes to forming an object image formed by the light beam on the image forming surface; and a plurality of lenses, which are reflected by the reflection unit. A second lens group to which a light beam is incident; and a second lens group between the first lens group and the second lens group for forming a subject image traveling from the first lens group to the reflection means. Above the light beam and the reflection means The second diaphragm means or the reflecting means for blocking unnecessary light rays passing outside the position where both outermost rays of the light flux for forming the subject image heading toward the second lens group intersect. At least one of unnecessary light reflection preventing means provided to prevent light rays from being reflected at a portion other than a portion where a light beam for forming a subject image incident on the reflecting means is to be incident; and A third lens is provided near a surface of the lens closest to the reflecting means, which faces the reflecting means, for blocking unnecessary light rays other than light rays contributing to forming a subject image. A camera, comprising: aperture means; 2. A first lens group, comprising a plurality of lenses, into which a light beam from a subject enters, and transmitting light, which enters from the subject side and passes through the first lens group, to the first lens group. A reflecting means for reflecting the light in a direction substantially perpendicular to the axis; a reflecting means provided on a surface of the first lens group, which is located closest to the reflecting means, facing the reflecting means; A first aperture unit for blocking unnecessary light beams other than a light beam that contributes to forming an object image formed by the light beam on the image forming surface; and a plurality of lenses, which are reflected by the reflection unit. A second lens group to which a light beam is incident; and a second lens group between the first lens group and the second lens group for forming a subject image traveling from the first lens group to the reflection means. Above the light beam and the reflection means A second aperture means for blocking unnecessary light rays passing outside the position where both outermost rays of the light flux for forming a subject image heading toward the second lens group intersect; Of the lens group closest to the reflection means of the lens group is provided near a surface facing the reflection means, and is for blocking unnecessary light rays other than light rays that contribute to forming a subject image. Third stop means, and unnecessary light reflection preventing means provided on the reflection means for preventing light rays from being reflected at a portion other than a portion where a light flux for forming a subject image incident on the reflection means should enter. And a camera comprising: 3. The camera according to claim 1, wherein the reflection unit is disposed only at a portion where a light beam for forming a subject image is incident. 4. A method for preventing a part of light rays incident on a lens of the second lens group disposed closest to the reflecting means from being reflected by an outer peripheral edge of the lens. 4. The camera according to claim 1, wherein the diameter of the lens is set to be larger than the inner diameter of the third stop means. 5. A first lens group, comprising a plurality of lenses, into which a light beam from a subject enters, and transmitting light, which enters from the subject side and passes through the first lens group, to the first lens group. A reflecting means for reflecting the light in a direction substantially perpendicular to the axis; a reflecting means provided on a surface of the first lens group, which is located closest to the reflecting means, facing the reflecting means; A first aperture unit for blocking unnecessary light beams other than a light beam that contributes to forming an object image formed by the light beam on the image forming surface; and a plurality of lenses, which are reflected by the reflection unit. A second lens group to which a light beam is incident; and a second lens group between the first lens group and the second lens group for forming a subject image traveling from the first lens group to the reflection means. Above the light beam and the reflection means The second diaphragm means or the reflecting means for blocking unnecessary light rays passing outside the position where both outermost rays of the light flux for forming the subject image heading toward the second lens group intersect. And at least one of unnecessary light reflection preventing means for preventing light rays from being reflected at a portion other than the portion where the light flux for forming the subject image incident on the reflecting means is to be incident. And the camera. 6. A first lens group, comprising a plurality of lenses, to which a light beam from a subject enters, and transmitting light, which enters from the subject side and passes through the first lens group, to light of the first lens group. A reflecting means for reflecting the light in a direction substantially perpendicular to the axis; a reflecting means provided on a surface of the first lens group, which is located closest to the reflecting means, facing the reflecting means; A first aperture unit for blocking unnecessary light beams other than a light beam that contributes to forming an object image formed by the light beam on the image forming surface; and a plurality of lenses, which are reflected by the reflection unit. A second lens group to which a light beam is incident; and a second lens group between the first lens group and the second lens group for forming a subject image traveling from the first lens group to the reflection means. Above the light beam and the reflection means A second diaphragm means for blocking unnecessary light rays passing outside a position where both outermost rays of the light flux for forming a subject image heading for the second lens group intersect; A unnecessary light reflection preventing means for preventing light rays from being reflected at a part other than a part where a light beam for forming a subject image incident on the reflecting means is provided. .