JP3221027B2 - Viewfinder and camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panorama photographing finder applicable to a camera such as a single-lens reflex camera (SLR) capable of panorama photographing, and an application of the finder.
It is related to the camera that was used.

[0002]

2. Description of the Related Art Recently, a trimming system applicable to a camera has been proposed. This system uses, for example, information for specifying a predetermined range in the image forming area B of the film 141 shown in FIG.
By printing the image on a predetermined portion 142 of the emulsion surface of FIG.
Is a system capable of printing on the area A ′ of the photographic paper 143 shown in FIG.

[0003] More specifically, when photographing in the trimming mode, the trimming information is stored in a predetermined portion 142 of the film 141.
At the time of printing, by a reading device,
This information is read, and enlargement zooming is performed in the printing apparatus according to the information.

The enlargement zooming by the trimming information is called “electronic zoom (EZ)” or “pseudo zoom”, and the ratio of the diagonal length of the area specified by the electronic zoom to the diagonal length of the film is called the trimming magnification.

In the above-mentioned trimming, the aspect ratio of the top, bottom, left and right of the photographing area is constant, but the area C excluding the upper and lower portions of the film shown in FIG. There is a system that can perform panoramic photography by extending the image and printing it on photographic paper to obtain a landscape print from the time of normal photography, and also proposes a method of writing panorama information on a predetermined portion 142 of the film together with the trimming information. Have been.

A viewfinder that can be applied to a system corresponding to the above-mentioned panoramic photography needs to switch the field of view. As a method of switching the visual field range, a method of exchanging a screen constituting a visual field frame, a method of indicating a visual field range by a liquid crystal display, and the like are conventionally known.

Further, as an application filed by the applicant of the present invention, a rectangular opening is formed by combining two U-shaped field limiting members, and the opening indicates a visual field range.
By relatively moving the field-of-view limiting member in the diagonal direction at the overlapping portion of the field-of-view limiting member in the opening, openings having different aspect ratios corresponding to the normal shooting mode and the panoramic shooting mode are formed.

[0008]

However, there is a problem in that the replacement of the screen is troublesome in the method of replacing the screen, and the cost of the method using the liquid crystal display is high.

Generally, the view frame of a finder is
The finder optical system has a curved shape in order to correct the bending due to distortion, and the shape differs depending on the position of the field frame. In the method of combining two U-shaped field-of-view limiting members, the position of the field frame changes between the normal shooting mode and the panoramic shooting mode, so that the opening cannot be adapted for distortion correction.
Therefore, if the size of the visual field range is changed by moving the visual field frame during normal photographing, distortion cannot be corrected in both the normal photographing mode and the panoramic photographing mode.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and a finder and a finder capable of appropriately switching between a field of view in a normal shooting mode and a field of view in a panoramic shooting mode are provided. Applied mosquitoes
The purpose is to provide mela .

[0011]

In order to achieve the above object, the finder according to the first aspect has a luminous flux more than an eyepiece optical system.
The first field of view provided in the finder field on the upstream side
A first field frame member having an edge forming an area;
Is provided movably with respect to the field frame member of
A second field frame with an edge forming a field of view in the field of view
Material, and the first edge of the second field frame member that has moved is
Fine that switches from the field of view frame range to the second field of view range
And the distortion of the eyepiece optics
The first and second visual field ranges are set so that the four sides are straight lines.
And forming the edge of the second field frame member with a curved line.
Features.

Further, the finder according to claim 2 is a
A fixing member having a vertical edge and a pair of horizontal edges;
A first movable member having two horizontal edges, one vertical edge and one
A second movable member having a lateral edge of
A pair of vertical edges of the fixed member, a horizontal edge of the first movable member and a second movable member.
A state of a first visual field range formed by a lateral edge of the moving member;
A pair of horizontal edges of the fixed member, a vertical edge of the first movable member, and a second
State of the second field of view formed by the vertical edge of the movable member
And actuating the first and second movable members to achieve
First and second viewing ranges having different aspect ratios
And a switching mechanism for switching between .

According to a third aspect of the present invention, in the finder according to the second aspect , an eyepiece optical system is further provided,
Each edge is formed as a curve so that the four sides of the first and second visual field ranges become straight lines by distortion of the eyepiece optical system. And the camera according to claim 4.
Is located upstream of the eyepiece optical system,
A second field having an edge forming a first field of view in the under field;
A first field frame member and a movable member with respect to the first field frame member;
Is provided and forms a view range in the viewfinder view
A second viewing frame member having an edge;
The first visual field range and the second visual field range are defined by the edge of the visual field frame member.
A camera with a viewfinder that switches to the
1st and 2nd by the distortion of the eyepiece optical system
First and second fields of view such that the four sides of the field of view are straight lines
The edge of the frame member is formed by a curve.
You. The camera according to claim 5 has a pair of vertical edges and a pair of horizontal edges.
A fixing member having an edge, having one vertical edge and one horizontal edge
Having a first movable member, one vertical edge and one horizontal edge
A second movable member, and a pair of fixed members.
A vertical edge, a horizontal edge of the first movable member, a horizontal edge of the second movable member,
The state of the first visual field range formed by
, The vertical edge of the first movable member, and the vertical edge of the second movable member
And the state of the second field of view formed by
Activating the first and second movable members to make them different in aspect ratio.
Switch between the first field of view and the second field of view
A replacement mechanism is provided. Claim 6
The camera according to claim 5, further comprising an eyepiece.
It is equipped with a scientific system and
Each edge is set so that the four sides of the first and second visual field ranges become straight lines.
Is formed by a curve.

[0014]

[0015]

[0016]

In the finder according to the first aspect, the first visual field range is provided.
Is formed by a first field frame member and a second field of view
Is a view of at least one of the first and second field frame members.
These field ranges are formed by field frame members
Is achieved by moving the second field frame member. For example,
A field of view in which the first field of view corresponds to the normal shooting mode
And the second field of view corresponds to the panoramic shooting mode
If the field of view is set to
The range can be switched. In this finder
Is such that the four sides of the first and second viewing ranges are straight lines
In consideration of the distortion of the eyepiece optical system,
Since the edge of the second field frame member is formed by a curve,
Good distortion correction even in the same shooting mode
It becomes possible.

In the finder according to the second aspect, a vertical edge and a horizontal edge are provided.
And a vertical member and a horizontal member.
And two movable members.
By actuating the moving member, a pair of vertical
First view formed by the edge and the lateral edge of each of the two movable members
The state of the field range, a pair of side edges of the fixed member and two movable parts
A state of a second field of view formed by the vertical edge of each material;
The switching mechanism that makes
Different first and second visual field ranges
Can be. For example, if the first field of view is a field of view corresponding to the normal shooting mode, and the second field of view is a field of view corresponding to the panorama shooting mode, the field of view can be switched in time according to the shooting mode. it can. Further, in this viewfinder, the edges forming the four sides of the first field of view and the edges forming the four sides of the second field of view are different from each other, so that the positions of the four sides of the field of view vary according to the shooting mode. Also, the shape of each edge can maintain the shape of the visual field range corresponding to the distortion correction.

In the finder according to the third aspect , the first finder further comprises:
And the fixing member and the two members in consideration of the distortion of the eyepiece optical system so that the four sides of the second field of view are linear .
The edge of the movable member is formed by a curve. Therefore, good distortion correction can be performed in any shooting mode. In the camera according to the fourth aspect, the
The first field-of-view range corresponds to the first field-of-view frame member.
Thus, the second visual field range is formed by the first and second visual fields.
Formed by at least one of the frame members
The switching of these visual field ranges is performed by the second visual field frame member.
Made by the move. For example, through the first field of view
The field of view corresponds to the normal shooting mode, and the second
Set the field range as the field of view corresponding to the panorama shooting mode.
Switch the time-of-view range according to the shooting mode.
Can be. In this camera, the first and second viewing ranges
Of the eyepiece optics so that the four sides of the
The edges of the first and second visual field frame members are curved with
In any shooting mode
Distortion correction becomes possible. A camera according to claim 5.
Then, in the equipped finder, the vertical edge and the horizontal edge
It has a pair of fixing members and one vertical edge and one horizontal edge
And two movable members.
By actuating the pair, the pair of vertical
First field of view formed by the lateral edge of each of the two movable members
State, a pair of lateral edges of the fixed member and each of the two movable members
And the state of the second field of view formed by the vertical edge of
Because of the switching mechanism, different aspect ratios
And a first visual field range and a second visual field range can be obtained.
You. For example, the first field of view is set to correspond to the normal shooting mode.
Panoramic photography of the second field of view
If you set the field of view to correspond to the shooting mode,
The field of view can be switched as needed. Also,
Camera, the edge forming the four sides of the first field of view is
Are different from the edges that form the four sides of the field of view 2.
The position of the four sides of the field of view varies according to the shooting mode.
Even with the shape of each edge, the field of view is corrected for distortion
It is possible to maintain the shape that corresponds to. The turtle of claim 6
In addition, the four sides of the first and second visual field ranges are straight lines.
In consideration of the distortion of the eyepiece optical system
The edges of the fixed member and the two movable members are formed as curves.
You. Therefore, a good display can be obtained in any shooting mode.
Torsion correction becomes possible.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 shows a schematic configuration of a camera including a finder to which the present invention is applied. In FIG. 1, reference numeral 1 denotes a photographing lens, which is usually detachable from the camera body 4. Reference numeral 2 denotes a main mirror that guides light that has passed through the photographing lens 1 toward an upper finder optical system 3, and is provided in the camera body 4. Reference numeral 5 denotes a film. Reference numeral 6 denotes AF of a part of the light from the photographing lens 1.
(Automatic focus detection) This is an AF sub-mirror directed to the module 7.

The finder optical system 3 includes, in order from the upstream side of the light, a reticle 8 disposed at a position of a primary image plane on which a primary image is formed by the photographing lens 1, and a first condenser lens 9
A first mirror 10 for directing the light from the condenser lens 9 forward, a second mirror 11 for directing the light from the first mirror 10 upward, and a reduced virtual image of the primary image of the focusing screen 8 as the focal point. A relay auxiliary lens 12 for forming light downstream of the plate 8, a third mirror 13 for making the light from the relay auxiliary lens 12 parallel to the optical axis of the photographing lens 1 and pointing backward; A zoom relay lens system 14 used for pseudo-zoom, a fourth mirror 15 for directing light from the zoom relay lens system 14 downward, a second condenser lens 16, and a second image plane on which a secondary image is formed. A fifth field frame 17 disposed at the position, and a fifth light source for passing light passing through the field frame 17 parallel to the optical axis of the photographing lens and facing backward.
An LCD (Liquid Crystal Display) 20, which comprises a mirror 18 and a fixed eyepiece 19, and further creates a display character or the like for a so-called in-finder display for displaying a shutter speed, an aperture value, etc. outside the field of view. An infinder submirror 21 and an infinder prism 22 are provided at respective positions shown in the figure. Incidentally, reference numeral 23 denotes a pupil position.

In this embodiment, the main mirror 2 and the first to fifth
Mirrors 10, 11, 13, 15, and 18 in total (even number)
Is used, the final finder image is an erect erect image with respect to the image to be taken.

The zoom relay lens system 14 is composed of a two-component, three-lens lens system, and moves from the primary image plane to the secondary image plane by moving while changing the relative relationship corresponding to the trimming magnification by the pseudo zoom. The image magnification on the secondary image plane with respect to the primary image plane can be changed while keeping the conjugate length to the image plane constant.

A trimming system for trimming a part of the entire image forming area of the film 5 and extending the area during printing, in which the entire image forming area B of the film shown in FIG. A WIDE state, a state in which a partial area A is set as a shooting range is a TELE state, and a state in which a certain size between the area A and the area B is set as a shooting range is MI.
In the DDLE state, the luminous flux is regulated by the field frame 17. In the WIDE state in FIG. 2, the zoom relay lens system 14 is at the position indicated by the solid line, and the luminous flux passes from the taking lens 1 within the range indicated by the solid line. In the TELE state, the zoom relay lens system 14 is at the position indicated by the broken line, and the light beam passes within the range indicated by the broken line. Accordingly, in the WIDE state, a range indicated by a solid line on the film 5 is a shooting region, and in a TELE state, a range indicated by a broken line on the film 5 is a shooting region. In the MIDDLE state, the zoom relay lens system is located at an intermediate position between the WIDE state and the TELE state, and is indicated by an imaging range of a predetermined size (not shown).

In this embodiment, the visual field frame 1 for restricting the visual field is used.
Since 7 is not on the reticle 8 which is the primary image plane, but on the secondary image plane, it is not necessary to change the size of the visual field regulating member corresponding to the pseudo zoom.

The relay optical system (relay auxiliary lens 12 + zoom relay lens system 14) is a reduction optical system, whereby the secondary image plane can be made smaller than the primary image plane. The optical path can be narrowed.
Further, since the focal length of the eyepiece 19 is shortened to obtain the same magnification as that of the conventional finder optical system, it is possible to finish the whole compact.

In the present embodiment, since the bending of the optical path by the fourth mirror 15 is slightly deviated forward rather than directly downward, the angle of incidence of the optical path on the fourth mirror 15 and the fifth mirror 18 is 45 °. It is getting smaller.

It is necessary to provide an interval between the third mirror 13 and the fourth mirror 15 for moving the zoom relay lens system 14, so that the fourth mirror 15 is moved backward. Here, if the optical path is bent directly downward by the fourth mirror 15 and further bent backward by the fifth mirror 18, a large space is opened between the first mirror 10 and the fifth mirror 15, and a useless space is created. . In addition, the eyepiece lens 19 protrudes greatly backward.

Therefore, as shown in FIG.
The incident angles θ1 and θ2 of the optical path to the fifth and fifth mirrors 18 are 4
By making the configuration smaller than 5 ° and making the fifth mirror 18 closer to the first mirror 10, a useless space is eliminated and a compact configuration is obtained. That is, the fourth
By setting the angle of incidence of the optical axis on the mirror 15 to less than 45 °, the light travels toward the first mirror 10 and the first mirror 1
The fifth mirror 18 can be located in the space immediately behind the zero, and the angle of incidence of the optical axis on the fifth mirror 18 is 4 °.
By setting the angle to be less than 5 °, light can be made to travel rearward, and the fifth mirror 18 can be brought close to the first mirror 10 along the first mirror 10. At the same time, the eyepiece lens 19 can also be brought closer to the front first mirror 10, so that the eyepiece lens 19 does not protrude greatly rearward, and a compact configuration can be achieved with only the finder alone.

FIG. 14 shows the first to fifth mirrors 10, 11, 13, 1 when the incident angles θ1 and θ2 of the optical axis to the fourth mirror 15 and the fifth mirror 18 are larger than 45 °.
5 and 18 are shown. As shown in FIG.
If the angle is larger than 5 °, the fifth mirror 18 cannot be located in the space immediately behind the first mirror 10 and the first mirror 1
There is a useless space between the zeroth mirror and the fifth mirror 18.

On the back surface of the third mirror 13, a flash light emitting section 24 is arranged, and a flash condenser 25 is provided at the position shown in the figure. A finder that performs zooming in response to pseudo zoom as in the present embodiment includes:
It is inevitably larger than a conventional finder that does not perform zooming, for example, a finder using a pentaprism. Further, if a flash is provided above the viewfinder, the height of the camera may be increased. However, in this embodiment, since the flash light emitting unit 24 is disposed in the back of the third mirror 13, that is, in the triangular space on the back of the third mirror 13, the finder hardly grows upward or forward. . In addition, the flash condenser 25 is disposed in the space behind the first mirror 10, thereby preventing the camera from being enlarged. Therefore, by disposing the flash light emitting unit 24 on the back surface of the third mirror 13 and disposing the flash condenser 25 on the back surface of the first mirror 10, the finder and the flash device as a whole can be made relatively compact. It is possible.

FIG. 1 shows a detailed configuration of a finder using this optical system. The viewfinder is composed of three blocks: an objective block 31, a zoom block 32, and an eyepiece block 33.
The objective block 31 includes a focusing screen 8, a first condenser lens 9, a first mirror 10, a second mirror 11, and a relay auxiliary lens 12. The objective block 31 includes a reticle 8, a first mirror 10,
The second mirror 11, the relay auxiliary lens 12, and the side surface of the objective block 31 form a hermetically sealed structure to prevent dust and the like from adhering to the focusing screen 8, which is an image forming surface. The zoom block 32 holds a third mirror 13, a zoom relay lens system 14, a fourth mirror 15, and a second condenser lens 16.

When photographing is performed in the trimming mode, as described above, zooming is performed by the zoom relay lens system 14, so that the area actually printed can be viewed as a finder image. Further, at that time, the information recording device 26 (FIG. 2) writes the trimming information on the film by optical, magnetic or other methods, and reads the information at the time of printing, whereby printing can be performed under the same conditions as at the time of shooting.

The zoom relay lens system 14 is composed of, in order from the object side, a first component G1 composed of a biconvex positive lens, and a second component G2 composed of a biconvex positive lens and a concave / convex negative lens. Each of these components is a lens holder 3
4, 35 fixed. Here, a mechanism for driving the zoom relay lens system 14 will be described with reference to FIGS.
It will be described based on. The lens holders 34 and 35 can be moved only in the front-rear direction along the guide rod 41, and the pins 42 and 43 provided on the lens holders 34 and 35 are urged by springs 44, respectively, so that the cam surfaces 4
The position is determined by abutting on 5, 46. The cam plate 47 having the cam surfaces 45, 46 cut off is driven by a motor 55 via gears 48, 49, 50, 51, 52, 53, 54. The gears 52 and 54 are worm gears, achieving compact high-speed reduction. Also, the surfaces 56 and 57 on the cam plate at both ends of the zoom range
By contacting the projections 58, 59 provided on the zoom block 32, accurate image magnification can be achieved at both ends of the zoom range. A contact piece 60 is fixed to the lens holder 34, and the zoom position can be detected by conduction between the contact piece 60 and a pattern on an encoder board 61 fixed on the zoom block 32. Therefore, the image magnification can be controlled by the microcomputer as described later. FIG. 3 shows a state in which the finder is in the WIDE state, and FIG. 4 shows a state in which the finder is in the TELE state.

FIG. 17 shows a system in which the finder optical system 3 including the zoom relay lens system 14 is linearly arranged on the optical axis. FIG. 17B shows a state in which the first component G1 and the second component G2 of the zoom relay lens system 14 are the rearmost in the WIDE state. FIGS. 17 (c) and 17 (d) show MIDDLs, respectively.
Indicates E, TELE status, and changes from WIDE status to MIDDL
As the state changes to the E and TELE states, the first component G1 and the second component G2 of the zoom relay lens system 14 move forward, and
The magnification from the secondary image plane 33S to the secondary image plane 34S increases. The secondary image plane 34S has the field frame 17 of a predetermined size shown in FIG. 1, so that the visual field range that can be seen by the finder is changed from the WIDE state to the TEL state on the primary image plane 33S.
It becomes narrower according to the E state. 19 (a) and 19 (b),
The view of the viewfinder in the WIDE and TELE states respectively is shown.

In general, when a mirror is used in the optical path, it is difficult to make the optical axes of the optical systems before and after the mirror coincide. This tendency becomes stronger as the number of mirrors increases. In the present embodiment, a field frame 17 (FIGS. 1 and 2) is arranged at the position of the secondary image plane as a field-of-view limiting mechanism for indicating the photographing range when the user looks through the finder. However, if the optical axis shifts, the field frame 17
Is shifted in the direction perpendicular to the optical axis on the reticle 8 to show an incorrect shooting range.

As means for correcting the deviation of the optical axis, means for moving and adjusting the field frame 17 in a direction perpendicular to the optical axis;
There is a means for adjusting by changing the angle of any of the reflection mirrors in the optical path from the reticle 8 to the field frame 17.

A switching mechanism for the panoramic mode is incorporated in the field frame 17 as will be described later. In order to move the field frame 17, the entire switching mechanism must be moved. Therefore, the former method of moving the field frame 17 is not appropriate.

On the other hand, the latter means for adjusting the angle of the reflection mirror has different effects depending on which mirror is used for adjustment. When adjustment is performed using a reflection mirror whose optical path is close to the primary image or the secondary image, the amount of movement of the optical axis corrected with respect to the swing amount of the mirror is small, and the deviation of the optical axis is eliminated. For adjustment, the swing amount of the reflection mirror must be increased. For that purpose, it is necessary to make a large gap for the mirror to move. As described above, since the relay optical system is a reduction optical system, the first mirror 10 near the primary image plane is the largest, and the moving amount of the optical axis corrected with respect to the amount of the mirror angle depending on the magnification. Is the least.

Therefore, in particular, the first mirror 10 on the primary image plane side
If the adjustment is made by using a mirror, the amount of swing of the mirror angle to correct the deviation of the optical axis will be large, and a large space for the mirror is required. However, one-sided blur is likely to occur.

Therefore, in the present embodiment, the third mirror 13 immediately before the zoom relay lens system 14 can be adjusted. The third mirror 13 is far from both the reticle 8 and the field frame 17 and has a small swing amount for adjustment, and is unlikely to cause one-sided blur. Further, the third mirror 13 is smaller in size than the other mirrors and is located in front of and above the finder optical system 3, so that the adjustment is easy.

This adjustment will be described with reference to FIG. FIG. 5A shows a holder 71 of the third mirror 13. An opening 72 at the center of the holder 71 has a third mirror 13
Are fixed, and screw holes 73,
74 and 75 are provided. And this holder 71
Is fixed on the zoom block 32 at the screw holes 73 to 75 by screws via three springs, as shown in a vertical sectional view in FIG. The springs 77 and 78 and the screws 80 and 81 correspond to the screw holes 74 and 75, respectively, and the screw hole 73 corresponds to a spring and a screw (not shown). Each screw is adjusted such that the optical axis of light guided upward from the relay system auxiliary lens 12 and the optical axis of the zoom relay lens system 14 match.

As shown in FIG. 1, the eyepiece block 33 holds the fifth mirror 18 and the eyepiece 19.
Since the holder 36 of the eyepiece 19 is fixed to the eyepiece block 33 with the washer 37 interposed therebetween, the washer 37
The diopter can be adjusted by changing the thickness of the lens. In FIG. 1, the configuration relating to the infinder display is omitted.

The objective block 31 is connected to the camera body 4
(FIG. 2), the zoom block 32 is attached to the objective block 31,
The eyepiece block 33 is fixed to the zoom block 32, respectively, and the field frame 17 and a mechanism for restricting the field of view exist between the zoom block 32 and the eyepiece block 33.

FIG. 6 shows a mechanism for restricting the visual field provided near the visual field frame 17. When shooting in panorama mode, it is desirable that the viewfinder field of view matches the print.
The vertical direction is restricted. In the standard state (normal shooting mode) of FIG. 6A, the viewfinder field is formed by the field frame 17. Edge 1 of field frame 17
04, 105, 106 and 107 are eyepieces 19 (FIG. 1)
In order to prevent the image from being distorted due to the distortion caused by the distortion, a predetermined curved shape is corrected so that the image looks straight when observed.

View restriction plates 91 and 92 above and below the field frame 17.
Are engaged with pins 112, 113, 114, and 115, respectively, so that the view restriction plates 91 and 92 can move only in the vertical direction. In the panorama mode, the view restriction plates 91 and 92 move to the positions shown in FIG. 6B to form a viewfinder view. Edge 1 of view restriction plates 91 and 92
08 and 109 have the same curved shape as the edges 104 and 105 and have been corrected so that they look straight at the time of observation. However, as shown in FIG. 6B, the edges 104 and 105 are corrected.
Since the correction is performed at a position different from the position shown in FIG.
Are formed with curves different in shape from the edges 104 and 105. In practice, the edges 104, 105, 106, 107, 1
08 and 109 are part of a circle having a certain radius, and 1
The radii of the curves 08 and 109 are larger than the radii of the curves 104 and 105.

By writing "PANORAMA" or the like on the visual field limiting plates 91 and / or 92, it is possible to easily display the mode in the viewfinder. In addition, by using translucent ones as the visual field limiting plates 91 and 92, the visual field range of panoramic imaging can be clearly understood, and the periphery of the visual field range can be confirmed. 7 (A) and 7 (B) show FIG.
6B shows the view of the viewfinder in the state shown in FIG. In either state, distortion is corrected and the viewfinder field is rectangular. In the panorama mode (FIG. 7B), "PAN"
"ORAMA" is displayed to indicate that the camera is in the panorama mode.

As shown in FIG. 6, pins 94 and 95 provided on the drive lever 93 are fitted in oblong holes 96 and 97 of the view restriction plates 91 and 92. The limiting plates 91 and 92 move in the vertical direction. That is, the view restricting plates 91 and 92 perform a moving operation so as to restrict the field of view in an equal range from the vertical direction of the field of view formed by the field frame 17, thereby changing the size of the field of view up and down, and This shows the field of view in the shooting mode. Since the change in the size of the field of view is performed in one direction opposing from above and below, it is possible to maintain a shape in which the field of view can cope with distortion correction even by such a change.

The drive lever 93 is rotatable about a shaft 102 and is urged counterclockwise by a spring 98, that is, in the direction of closing the view restriction plate.
The rotation position is regulated by the lever 101 abutting on 00.
The operation lever 99 has a click (not shown), and stops at a position corresponding to each of the standard and the panorama. In the panoramic shooting mode, as shown in FIG. 6B, the positions of the visual field limiting plates 91 and 92 are set to the slots 116 and 11.
The ends of 7, 118 and 119 are pins 112, 113 and 11, respectively.
4, 115, and the pin 100 on the operation lever 99 and the lever 101 are separated. Accordingly, in the panorama mode, even if the position of the operation lever 99 is not accurate, it is possible to accurately position the visual field limiting plates 91 and 92. The contact piece 11 is provided on the operation lever 99.
0 in the panorama mode.
1 and generates a panorama signal.

The view restriction for the panorama mode is set by the view restriction plates 91 and 9 which are separate members from the view frame 17 during normal photographing.
As described above, the field of view having different edge shapes between the panorama mode and the normal photographing can be controlled by performing the above operation. That is, the edges of the field frame 17 and the field limiting plates 91 and 92 indicating the field of view in each shooting mode are respectively distorted by the eyepiece 19 (FIG. 1) that guides the subject in the field of view to the pupil. By using a curve that can be observed as a straight line, good distortion correction is possible in any shooting mode.

The stop positions of the moving view restriction plates 91 and 92 need to be accurate only in the panorama mode shown in FIG. 6B. And FIG.
At the time of the standard photographing of (A), since the view restriction plates 91 and 92 are hidden by the fixed view frame 17, the stop position accuracy is not required, and as a result, the manufacture of the view restriction mechanism is facilitated.

It should be noted that the information recording device 26 (FIG. 2) can be used in the panoramic mode as well as in the trimming mode.
The panorama printing is performed by reading this information at the time of printing.

Next, another field frame 1 applicable to this embodiment.
FIGS. 15 and 16 show the mechanism for restricting the visual field in FIG.
It will be described based on.

The visual field frame 17 includes a fixed visual field regulating plate P,
The two movable view restriction plates Q and R and the guide pin 12 for moving the view restriction plates Q and R in a predetermined direction.
5S, 126S, 127S, 128S and drive lever 1
29S. The view restriction plate P has edges 121S, 122S, 123S, 1 for forming a frame for view restriction.
24S, and the visual field regulating plate Q has edges 130S, 131.
S, and the visual field restriction plate R further has edges 132S and 133S. WIDE, MIDDLE, TELE status (hereinafter "N
In the "ORMAL state"), the visual field restricting plates P and Q are at the positions shown in FIG. 15, and the frames for restricting the visual field are formed by 121S and 123S of the visual field restricting plate P and the movable visual field restricting plate Q. 130S and 132S of the visual field regulating plate R. P
When the state is changed to the ANORAMA state, the drive lever 129S rotates counterclockwise, and the visual field regulating plates Q and R
It moves in an oblique direction along 25S, 126S, 127S, 128S, and becomes the state of FIG. At this time, the frame for regulating the visual field is formed by the 131 of the visual field regulating plate Q.
S, 133S of the view restriction plate R, and 1 of the view restriction plate P
22S and 124S.

As described above, in general, the frame for regulating the visual field of the finder optical system is not a rectangle but each side has a slightly curved shape in order to prevent the frame from being bent due to the distortion of the finder optical system. ing. FIG. 15 and FIG.
The four sides forming the frame for visual field regulation at 6 are NOR
Since different edges are used in the MAL state and the PANORAMA state, the NORMAL state and the PANORAMA state are used.
In the state A, the curved shape of each side can be optimized, and the distortion correction of the finder optical system can be performed by NORMAL and PANO.
It is optimal in each state of the RAMA.

The edge shape of the field frame 17 is WIDE, MID
In the DLE and TELE states, all remain the same as in FIG. 15, but in the PANORAMA state, as shown in FIG.
From the state of the edge shape at 5, the upper and lower sides are narrower, the left and right sides are wider, and the aspect ratio between the upper and lower sides and the left and right sides is almost equal to the area CS shown in FIG. At this time, in the state of the zoom relay lens system, as shown in FIG. 17A, the first component G1 and the second component G2 are ahead of the WIDE state, and the magnification of the entire finder system is higher than WIDE. The ratio of the magnification that is higher than WIDE is substantially equal to the ratio of the width of the left and right sides shown in FIG. PANORAMA
FIG. 17A showing the state of the zoom relay lens system in the state.
Is a predetermined position in the zoom range of FIGS. 17B to 17D, so that a variable power optical system for pseudo zoom can be used.

In the panoramic photography, FIG.
As shown in the area CS of FIG. 3C, the upper and lower cuts of the entire shooting area AS are taken as the shooting area. In the finder, the WID is increased by increasing the finder magnification as described above.
19 (c), which is wider than FIG. 19 (a), which is a view of the viewfinder in the E state, and can be observed with a feeling close to that of FIG. 20 (c), which shows an actual print state. it can.

18 (a), 18 (b) and 18
(c) is WIDE state, TELE or MIDD respectively
An image forming area of the film in the LE state and the PANORAMA state is shown, and 102S indicates an area where the trimming or panorama information is written. FIG.
0 (a), FIG. 20 (b) and FIG. 20 (c)
E state, TELE or MIDDLE state and PANOR
This shows a printing state in the AMA state.

This embodiment is a so-called TTL finder for performing finder observation through a photographing lens. Next, another embodiment will be described with reference to FIG.

FIG. 21B is a viewfinder block diagram of the present embodiment as viewed from the top side of the camera. The light from the subject passes through the objective lens 91S and bends the optical path in the horizontal direction while inverting the image vertically by the roof mirror 92S. Further, the light passes through a condenser lens 93S and passes through a field frame 94.
A subject image is formed near S. The light from the subject image is
Further, the light passes through the prism 95S as shown in the same figure, inverts the image in the left and right direction, emits backward, and is magnified by the eyepiece 96S. The objective lens 91S is composed of two lenses, a concave lens 97S and a convex lens 98S, and moves along the optical axis to change the size of a subject image formed near the field frame 94S. The position of the convex lens 98S is shown in FIG.
21C, the subject image becomes larger, and the finder magnification of the entire finder optical system becomes higher. Concave lens 97
S moves for correction so that the subject image is formed near the field frame 94S.

The field frame 94S is the same as that shown in FIGS. 15 and 16. Between the WIDE state and the TELE state of the pseudo zoom, the field frame 94S remains at a predetermined size as shown in FIG. (b) to FIG. 21 (c) show the objective lens 91S.
Is moved, the trimming range of the pseudo zoom can be indicated as the viewfinder visual field range. PANOR
In the AMA state, as shown in FIG. 21A, the convex lens moves to a predetermined position in front of the WIDE state of FIG. 21B, and the edge shape of the field frame 94S is the same as in the second embodiment. It changes as shown in FIG. In the present embodiment, the viewfinder view may be changed as shown in FIG.
In the RAMA state, it looks larger in the horizontal direction than in the WIDE state (FIG. 9A) and the TELE state (FIG. 9B).

As described above, the opposing 1
The two sides of the set are formed of movable view restriction plates, and the other set of two sides are formed of a fixed view restriction plate. If the field-of-view regulating plates forming two sides of a set are switched to the field-of-view regulating plates forming another set of two sides, a simple and compact configuration can be achieved.

Further, in the normal photographing mode, a pair of left and right opposite sides of the visual field range are constituted by movable view restriction plates, and a pair of upper and lower opposite sides are fixed. In the panoramic photographing mode, a pair of opposing upper and lower sides of the visual field range are configured as movable view restriction plates, and a pair of left and right opposing two sides are fixed. For example, when the visual field range is constituted by two movable visual field restricting plates and one fixed visual field restricting plate, distortion correction is appropriately performed even when performing a panoramic visual field expansion. In addition, the finder can be more effectively reduced in size.

Returning to the description of the embodiment shown in FIG. 1, FIG. 8 shows the appearance of a camera equipped with the finder of the embodiment. In the figure, reference numeral 121 denotes a power switch. 12
Reference numeral 2 denotes a mode switch for finder zooming, which includes a continuous mode for continuous zooming and a plurality of points.
(In this embodiment, three steps of tele, middle, and wide) are switched to a step mode for discretely zooming. 123
Is a panorama mode switch, 124 and 125 are EZ keys used for finder zooming, 126 is a shutter button, and 127 is a display board for displaying the state of the camera. The panorama mode switch 123 is an operation section of the operation lever 99 in FIG.

FIG. 9 shows a block diagram of the camera of FIG. In the figure, EZ-TELE and EZ-WIDE signals are signals generated by EZ keys 124 and 125,
The ODE signal is a signal generated by the mode changeover switch 122, and the PANORAMA signal is a signal generated by the panorama mode switch 123. Also, ENCO
DER-TELE, ENCODER-TELE-MID
DLE, ENCODER-MIDDLE, ENCODE
R-WIDE-MIDDLE, ENCODER-WID
Each signal of E is a signal generated from the encoder board 61 (FIGS. 3 and 4), and the zoom relay lens system 14 (FIGS. 1 and 2)
Between ELE, TELE and MIDDLE, MIDL
E, between WIDE and MIDDLE, when in each state of WIDE, a signal corresponding to the state is generated.

FIGS. 10 and 11 show sequence diagrams of the step mode of the present embodiment. Power switch 121 in FIG.
Is turned on, the flow starts from step # 100. PANmode and EZmem of step # 101
ory is information recorded in the memory 150 in FIG. 9 and is initialized when the power switch 121 is turned on.

Next, in step # 102, the finder variable magnification optical system is first set to the WIDE state. Since this is just after the power switch 121 is turned on, it is assumed that framing is performed in order for the user to look into the viewfinder and put a subject to be photographed into the field of view. This is because, in the WIDE state, a wider range can be seen with the finder, and the subject can be easily searched.

The routine below step # 103 is a routine that is repeatedly executed as an infinite loop when the power switch 121 is in the ON state.
When the power switch 121 is detected to be OFF at 103, the operation exits from the infinite loop and ends. Power switch 12
When 1 is OFF, the process proceeds to step # 104, and when the state of the finder variable magnification optical system is not WIDE, W
In order to enter the IDE state, the process goes through step # 102, proceeds to steps # 103 and # 104, and ends in step # 105. The WIDE state when the power switch 121 is turned off is for standby when the power switch 121 is turned on next time.
Also, framing is easily performed even if the user looks into the viewfinder before the power switch 121 is turned on.

In step # 106, when the photographic lens 1 (FIG. 2) is not mounted, a determination is made to change to the WIDE state. If not mounted, the process goes from step # 107 to step # 102, and enters the WIDE state. If it is not mounted, the process does not proceed to step # 108, and the finder variable magnification optical system is always kept in the WIDE state. When the taking lens 1 is not attached, it is necessary to keep the WIDE state
In order to prevent the lens from moving wastefully due to the operation of the Z keys 124 and 125 (FIG. 8) and the like, the battery is consumed. To do that.

The panorama mode switch 123 shown in FIG.
Is set to the panorama mode, the field of view for the panorama mode is linked with the panorama mode switch 123.
(FIG. 6B), and a PANORAMA signal (FIG. 9) is generated. In step # 108, the PANO
Finder zoom optical system WIDE by RAMA signal
State. The switch 123 is turned on immediately before the end of the change of the field of view, and after the end of the change of the field of view, the finder zooming is continuously performed.
The end of the field of view change and the start of the magnification change may overlap. For example, the start of the visual field change and the start of the magnification change may be simultaneous.

When the PANORAMA signal is ON, the flag PANmode indicating that panorama shooting has been performed is set to Yes in step # 109, and the WIDE state is set through step # 102. If the PANORAMA signal is ON, the process does not proceed to step # 110, and the finder variable magnification optical system is always kept in the WIDE state. In this embodiment, in order to indicate the photographing range of panoramic photographing, it is necessary to set the field of view linked to the panoramic mode switch for panorama and to set the finder variable magnification optical system to the WIDE state. Therefore, PANORA
When the MA signal is ON, the EZ keys 124, 125
EZ-TELE, EZ generated by pressing (Fig. 8)
-Disable the WIDE signal (FIG. 9) and always keep the finder variable magnification optical system in the WIDE state.

If the panorama mode switch is in the standard state, the field of view is the one at the time of standard photographing as shown in FIG. 6A, and the PANORAMA signal is turned off.
The process proceeds from step # 108 to step # 110. PAN
When the ORMA signal is ON, step # 109
After PANmode is set to Yes, PANORAM
When the A signal is turned off and the process proceeds to step # 110, the determination is Yes. At this time, step # 11
1. In step # 113, the lens is moved to the MIDDLE or TELE state depending on the contents recorded in the EZ memory. EZmemory is
The state of the finder variable magnification optical system immediately before the PANORAMA signal is turned on is stored, and the panorama mode switch 123 is set to the panorama state. Further, when the panorama mode switch 123 is set to the standard state thereafter, the panorama mode switch 123 can be returned to the state immediately before the panorama mode is set. Thus, for example, when selecting whether to shoot in the TELE state or the panorama shooting state, the panorama mode switch 123 is set to the panorama mode, the field frame is switched for panorama, and PAN is set.
TEL finder zoom optical system by OMARA signal
By changing from the state of E to the state of WIDE, a correct panoramic shooting range can be indicated. Then, when the panorama mode switch 123 is set to the standard state next, the field frame is switched to the standard one, and the finder variable magnification optical system immediately returns to the TELE state without pressing the EZ key.

Steps # 116 to # 118 are routines for moving the finder variable magnification optical system to the TELE state when the autofocus device switches from the autofocus state (AF) to the manual focus state (MF). . When the user switches to the manual focus state, the user manually focuses while looking at the subject with the viewfinder. Therefore, the viewfinder magnification is high, and the TELE state is set so that the focus can be more accurately adjusted. The routine below step # 119 is the routine shown in FIG.
This is a routine for switching the finder variable magnification optical system by an EZ-TELE or EZ-WIDE signal generated when any one of the Z keys 124 and 125 is pressed. EZ-
In the case of a TELE signal, if the state of the finder variable magnification optical system is MIDDLE, the state is TELE.
Switch to E, no change if in TELE state. EZ-W
In the IDE signal, the state of the finder variable magnification optical system is TE.
If it is LE, it switches to MIDDLE, if it is MIDDLE, it switches to WIDE, and if it is in WIDE state, it does not change. Step # 1
After changing the state of the finder variable magnification optical system in steps 19 to # 130, the process returns to step # 103, and the same routine is repeated.

MoveWIDE, M in FIGS. 10 and 11
oveMIDDLE and MoveTELE use the finder variable magnification optical system as WIDE, MIDDLE and TE, respectively.
This is a routine for moving the lens to the LE.

As an example, FIG. 12 shows MoveMIDDLE.
The following shows the routine. The encoder substrate 61 for detecting the lens position shown in FIGS.
(Generates ENCODER-WIDE signal), MIDDLE
(ENCODER-MIDDLE signal is generated), TELE
(Generate ENCODER-TELE signal) or between WIDE and MIDDLE (ENCODE
R-WIDE-MIDDLE signal is generated) and between TELE and MIDDLE (ENCODER-TELE-MI
(A DDLE signal is generated). M
The oveMIDDLE routine executes E in step # 151.
If the NCODER-MIDDLE signal has been generated, there is no need to move the lens, so the driver 155 and the motor 55 (FIG. 9) for moving the lens are stopped (#
152), and terminates the routine (# 153).

Step # 154 or step # 155
With the ENCODER-TELE signal or ENCODE
Lens is TE by R-TELE-MIDDLE signal
If it is detected that the lens is at the LE position or between TELE and WIDE, the lens is moved in the WIDE direction in step # 156, and ENCODER-MIDDL is moved in step # 151.
This is repeated until the E signal is detected.

In steps # 157 and # 158, E
NCODER-WIDE signal or ENCODER-WID
Whether the lens is in the WIDE position by the E-TELE signal or W
If the lens is detected to be between the IDE and the MIDDLE, the lens is moved in the TELE direction in the reverse direction, and step # 151 is performed.
Is repeated until ENCODER-MIDDLE is detected. In the case of the continuous mode, # 110 in FIG.
The subsequent operation at the time of canceling the panorama is omitted.
19 and after, ENCODER-TELE and ENCODE-ELE for the EZ-TELE and EZ-WIDE signals, respectively.
When the motor is not DER-WIDE, move the motor in the TELE direction.
What is necessary is just to change so that it may be rotated in the WIDE direction. As another configuration, the encoder may be further subdivided to perform the same processing as in FIGS.

[0077]

As described above, according to the first aspect of the present invention,
In this case, the four sides of the first and second visual field ranges are straight lines.
The eyepiece optical system in consideration of distortion.
Since the edges of the first and second field frame members are formed by curves,
For both the first and second viewing ranges,
The distortion correction becomes possible. As a result, the shooting mode
A viewfinder that provides an appropriate viewing range according to the image
can do.

In the finder according to the second aspect, the two movable
By actuating the member, a pair of longitudinal edges of the fixed member
And a first field of view formed by the horizontal edge of each of the two movable members
Range condition, a pair of lateral edges of the fixed member and two movable members
The state of the second field of view formed by each vertical edge,
It has a switching mechanism that makes it easy to
Obtaining different first and second viewing ranges
it can. Moreover, the four sides of the first field of view and the four sides of the second field of view are formed by different edges. Therefore, even if the positions of the four sides of the field of view vary according to the shooting mode, the field of view maintains the shape corresponding to the distortion correction by the shape of each edge , so that a finder that can easily perform the distortion correction can be realized.

In the finder according to the third aspect, further, the first
And the fixing member and the two members in consideration of the distortion of the eyepiece optical system so that the four sides of the second field of view are linear .
Since the edge of the movable member is formed by a curve, a finder that can obtain an appropriate visual field range according to the shooting mode can be realized. The camera according to claim 4 is provided with
Of the first and second viewing ranges in the viewfinder
Distortion of the eyepiece optics so that the sides are straight
In consideration of the above, the edges of the first and second field frame members are formed in a curved line.
So, for either of the first and second field of view
This also enables proper distortion correction. The result
As a result, a camera
Can be realized. In the camera of claim 5,
Activate the two movable members in the viewfinder
By doing so, a pair of vertical edges of the fixed member and two movable parts
A state of a first visual field range formed by a lateral edge of each material;
The pair of horizontal edges of the fixed member and the vertical edges of each of the two movable members
The state of the second field of view to be formed
The first view with different aspect ratios
A field range and a second viewing range can be obtained. Only
Are the four sides of the first field of view and the four sides of the second field of view.
Each is formed by different edges. Therefore, the field of view
Even if the position of the four sides of the range fluctuates according to the shooting mode,
Field of view supports distortion correction
Shape that is easy to correct for distortion.
Mela can be realized. In the camera of claim 6,
Furthermore, the four sides of the first and second visual field ranges are linear.
In addition, a fixing member considering the distortion of the eyepiece optical system
And the edges of the two movable members are formed with curved lines,
Create a camera that can provide an appropriate field of view according to the shadow mode.
Can be manifested.

[0080]

[0081]

[Brief description of the drawings]

FIG. 1 is a sectional view showing the structure of an embodiment of the present invention.

FIG. 2 is a sectional view showing a state in which the embodiment of the present invention is applied to a single-lens reflex camera.

FIG. 3 is a diagram for explaining driving of a zoom relay lens system used in the embodiment of the present invention.

FIG. 4 is a diagram for explaining driving of a zoom relay lens system used in the embodiment of the present invention.

FIG. 5 is a diagram for explaining adjustment of a third mirror used in the embodiment of the present invention.

FIG. 6 is a view for explaining a mechanism for limiting a visual field according to the embodiment of the present invention.

FIG. 7 is a view showing a view of a finder which is changed by a view restriction mechanism in the embodiment of the present invention.

FIG. 8 is a plan view showing the appearance of a single-lens reflex camera to which the embodiment of the present invention is applied.

FIG. 9 is a block diagram showing a schematic configuration of an embodiment of the present invention.

FIG. 10 is a flowchart showing a sequence in a step mode according to the embodiment of the present invention.

FIG. 11 is a flowchart showing a sequence in a step mode according to the embodiment of the present invention.

FIG. 12 is a flowchart showing a routine of MoveMIDDLE in the flowchart of the embodiment of the present invention shown in FIGS. 10 and 11;

FIG. 13 is a diagram illustrating a trimming system.

FIG. 14 is a view for explaining the arrangement of each reflecting mirror when the incident angles θ1 and θ2 of the optical axis to the fourth mirror 15 and the fifth mirror 18 are set to be larger than 45 ° in the embodiment of the present invention.

FIG. 15 is a diagram for explaining another view restriction mechanism applicable to the embodiment of the present invention.

FIG. 16 is a view for explaining another view restriction mechanism applicable to the embodiment of the present invention.

FIG. 17 is a diagram showing a configuration of a finder optical system in each shooting state of the embodiment of the present invention in a straight line along an optical axis.

FIG. 18 is a view for explaining an image forming area of a film in each shooting state in the embodiment of the present invention.

FIG. 19 is a view for explaining the appearance of a viewfinder in each shooting state in the embodiment of the present invention.

FIG. 20 is a diagram for explaining a printing state in each shooting state according to the embodiment of the present invention.

FIG. 21 is a diagram showing a configuration of a main part of another embodiment of the present invention.

[Explanation of symbols]

 17 Field of View Frame 91, 92 Field of View Limiter 93 Drive Lever 94, 95 Pin 96, 97 Slot 98 Spring 99 Operation Lever 100 Pin 101 Lever 102 Shaft 104-109 Edge 111 Contact Pieces 112 to 115 Pins 116 to 119 Slots 94S Field frames 121S to 124S Edge 125S to 128S Guide pins 129S Drive levers 130S to 133S Edge

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Satoshi Tanino 2-3-13 Azuchicho, Chuo-ku, Osaka-shi Osaka International Building Minolta Camera Co., Ltd. (72) Yoshinobu Kudo 2-chome Azuchicho, Chuo-ku, Osaka-shi No. 3-13 Osaka International Building Minolta Camera Co., Ltd. (72) Inventor Kotaro Hayashi 2-3-13 Azuchicho, Chuo-ku, Osaka-shi Osaka International Building Minolta Camera Co., Ltd. (56) References JP-A Hei 3 -273223 (JP, A) JP-A-61-160728 (JP, A) JP-A-4-233526 (JP, A) JP-A-3-105834 (JP, U) (58) Fields investigated (Int. . ^7, DB name) G03B 13/00 - 13/28

Claims (6)

(57) [Claims] A first field frame member provided on the upstream side of the light beam with respect to the eyepiece optical system and having an edge forming a first field range in a finder field; A second viewing frame member movably provided and having an edge forming a viewing range in the finder viewing field, wherein the first viewing range is moved by an edge of the moved second viewing frame member. A viewfinder that switches from the first to the second viewing range, wherein the edges of the first and second viewing frame members are such that the four sides of the first and second viewing ranges become straight lines by distortion of the eyepiece optical system. A finder characterized by forming a curve. 2. A fixed portion having a pair of vertical edges and a pair of horizontal edges.
Material and a first movable member having one longitudinal edge and one lateral edge
And a second movable member having one vertical edge and one horizontal edge,
And a pair of vertical edges of the fixed member, a horizontal edge of the first movable member,
Of the first field of view formed by the horizontal edge of the second movable member
And a pair of horizontal edges of the fixed member and a vertical length of the first movable member.
A second field of view formed by the edge and the vertical edge of the second movable member
The first and second movable members so as to form
Activate the first field of view and the second field of view with different aspect ratios.
A viewfinder comprising a switching mechanism for switching between two viewing ranges . 3. An eyepiece optical system , wherein each edge is formed by a curve so that four sides of the first and second visual field ranges become straight lines by distortion of the eyepiece optical system. 3. The finder according to claim 2, wherein: 4. An optical system provided upstream of the eyepiece optical system with respect to a light beam.
Edge that forms the first field of view in the viewfinder field
A first viewing frame member having
It is provided movably and has a field of view
A second field frame member having an edge forming an area
The edge of the second field frame member that has moved,
Fine switching from the first field of view to the second field of view
Camera with a Due to the distortion of the eyepiece optical system, the first and
The first and second fields of view are set so that the four sides of the second field of view are straight.
And the edge of the second field frame member is formed by a curve. Specially
Camera. 5. A fixing portion having a pair of vertical edges and a pair of horizontal edges.
Material and a first movable member having one longitudinal edge and one lateral edge
And a second movable member having one vertical edge and one horizontal edge,
With A pair of vertical edges of the fixed member, a horizontal edge of the first movable member,
Of the first field of view formed by the horizontal edge of the second movable member
And a pair of horizontal edges of the fixed member and a vertical length of the first movable member.
A second field of view formed by the edge and the vertical edge of the second movable member
The first and second movable members so as to form
Activate the first field of view and the second field of view with different aspect ratios.
Fine with switching mechanism to switch between two viewing ranges
A camera equipped with a camera. 6. An eyepiece optical system, further comprising an eyepiece optical system.
The first and second fields of view due to system distortion
Form each edge with a curve so that the four sides of the range are straight
The camera according to claim 5, wherein