JP2000056364A - Finder device for single lens reflex camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a camera compact while securing the strength of a mirror box by arranging at least one part of a driving member driving a light shielding member in a dead space formed on the outside of the reflection surface of an optical device. SOLUTION: This optical device 13 forming a finder image of a single lens reflex camera is provided with a reflection surface 13b obliquely formed so that its upper part projects to the front of the camera than its lower part and is brought in contact with the base of the device 13 and guides the finder image to an ocular part. Then, a classic image plane switching lever 3 is arranged in a space formed between the surface 13b obliquely arranged and a camera cover 19 and a panoramic image plane switching lever is also arranged in the space. A switching driving lever 4 driving the panoramic image plane switching lever and the lever 3 is also arranged in a space continuous to the space under the surface 13b, that is, formed between the surface 13b and the cover 19. This space is a dead space and the dead space is effectively utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finder device for a single-lens reflex camera which can switch among a plurality of finder screens in correspondence with a plurality of photographing screens.

[0002]

2. Description of the Related Art There is known a camera which can switch a plurality of finder screens corresponding to a plurality of types of photographing screens so that a photographer can confirm a photographing screen range. FIG. 8 shows a layout of the finder device when such a camera is viewed from the front. 101 is a screen, 102 is a finder display device, 103 is a finder display prism, 108 and 109 are finder screen light blocking members, 11
Reference numeral 0 denotes a pentaprism, 111 denotes a mirror box in which a finder image observation mirror is stored, and 112 denotes a drive mechanism of the finder screen light blocking members 108 and 109.

[0003]

As shown in FIG. 8,
In order to keep the size of the mirror box 111 to a minimum, it is necessary to provide a notch 111 a to avoid the drive mechanism 112. When the mirror box 111 is made of plastic for cost reduction and weight reduction, the cutout portion 111a becomes thin, causing a problem in strength. To avoid this thin wall, use mirror box 1
It is necessary to make the wall 111b of the eleventh extend slightly outside. However, in this case, there is a problem that the mirror box 111 becomes large and the whole camera becomes large.

An object of the present invention is to provide a viewfinder device for a single-lens reflex camera which effectively utilizes a dead space and realizes a compact camera while ensuring the strength of a mirror box.

[0005]

FIG. 1 shows an embodiment of the present invention.
The present invention will be described with reference to FIG. In order to achieve the above object, the invention according to claim 1 provides an optical element 13 for forming a finder image of a single-lens reflex camera, and an optical element 13 located on the bottom side of the optical element 13 and appearing in the optical path of the finder image to reduce the finder screen size. Light shielding members 8, 9, 10,
The present invention is applied to a finder device of a single-lens reflex camera provided with an optical element 11 and driving members 2 and 3 for driving light shielding members 8, 9, 10, and 11. It has a reflecting surface 13b for guiding a finder image to an eyepiece formed obliquely so that an upper portion protrudes, and the driving members 2 and 3 are disposed outside the optical element 13 by forming the reflecting surface 13b obliquely. At least a part is arranged in the formed space.
According to a second aspect of the present invention, in the finder device for a single-lens reflex camera according to the first aspect, the light shielding members 8, 9, 10, and 11 are provided.
To the first dimension that changes the vertical dimension of the finder screen.
, And second light-shielding members 10 and 11 for changing the size of the viewfinder screen in the left-right direction. The driving members 2 and 3 are used to drive the first light-shielding members 8 and 9. The first driving member 2 and the second driving member 3 for driving the second light shielding members 10 and 11 are formed, and at least a part of each of the first driving member 2 and the second driving member 3 is formed. It is arranged in the space. According to a third aspect of the present invention, in the finder device for a single-lens reflex camera according to the first or second aspect, the optical element includes a reflecting surface 13b formed obliquely.
3 includes a space extending downward from the space formed outside the camera 3. The invention of claim 4 is
The finder device for a single-lens reflex camera according to claim 2, further comprising a third driving member (4), which is a single member that drives the first driving member (2) and the second driving member (3) in an interlocked manner. The space includes a space extending in a camera lower direction from a space formed outside the optical element 13 due to the oblique reflection surface 13b, and at least a part of the third driving member 4 is provided. It is arranged in the space.

In the section of the means for solving the above-mentioned problems, correspondence is made with the drawings of the embodiment for easy understanding, but the present invention is not limited to the embodiment.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment In the following description, a wide screen refers to a screen (wide type, H type) having an aspect ratio of 9:16, and a classic screen refers to a screen having an aspect ratio of 2: 3. (The same vertical / horizontal ratio as the 35 mm film up to now, C type), and the panoramic screen is a screen with an aspect ratio of 1: 3 (panoramic type,
P type).

FIG. 1 is a diagram showing the configuration of a first embodiment of a finder screen size switching device according to the present invention. 1 is a prism box. Reference numeral 2 denotes a panorama screen switching lever. The axis 2a is in the hole 1a of the prism box 1 and the arm 2b.
Is installed on the prism box 1 in a state where it is inserted into the elongated hole 1b of the prism box 1. The panorama screen switching lever 2 is rotatable about the axis 2a within the range of the elongated hole 1b in which the arm 2b is movable. Reference numeral 3 denotes a classic screen switching lever, and the axis 3a is a hole 1c of the prism box 1.
The arm 3b is placed on the prism box 1 with the arm 3b inserted into the elongated hole 1d of the prism box 1. The classic screen switching lever 3 is rotatable about an axis 3a within a range of an elongated hole 1d in which the arm 3b is movable. 4
Is a switching drive lever, which is installed in the prism box 1 with the slot 4a inserted into the axis 1e of the prism box 1 and the slot 4b inserted into the axis 1f of the prism box 1;
a, 4b can be moved in the longitudinal direction. Reference numeral 20 denotes an operation transmitting member for operating the switching drive lever 4 by operating the photographer from the back of the camera. The photographer manually rotates the knob 20a provided on the back of the camera, and the rotational force is transmitted as a swinging motion of the arm 20c about the axis 20b.
0c is engaged with the groove 4f of the switching drive lever 4, and the switching drive lever 4 is driven.

Reference numeral 5 denotes a finder screen, which is installed at the bottom of the prism box 1. Reference numeral 6 denotes a display element in the viewfinder, which displays photographing information such as an aperture value and a shutter speed using a liquid crystal or the like. Reference numeral 7 denotes a display prism in the finder, which is installed in the accommodating portion 1g of the prism box 1 and receives the display by the display element 6 in the finder from the surface 7a, reflects the light on the surface 7b, and emits the light from the surface 7c. It is led to an eyepiece (not shown) through a roof mirror.

Reference numeral 8 denotes a first panoramic blade. The slot 8a is installed on the prism box 1 with the slot 8a inserted into the axis 1h of the prism box 1 and the slot 8b inserted into the axis 1i of the prism box 1. Engage with the arm 2c of the panorama screen switching lever 2, and use the panorama screen switching lever 2 to
a and 8b are driven in the longitudinal direction. Reference numeral 9 denotes a second panoramic blade, which is installed on the prism box 1 with the long hole 9a inserted into the axis 1h of the prism box 1 and the long hole 9b inserted into the axis 1i of the prism box 1, and the hole 9c is used to switch the panorama screen. It is engaged with the arm 2d of the lever 2 and is driven by the panorama screen switching lever 2 in the longitudinal direction of the slots 9a and 9b.

Reference numeral 10 denotes a first classic blade, which has a long hole 10a.
Is installed on the prism box 1 with the elongated hole 10b inserted into the axis 1k of the prism box 1, and the hole 10c is engaged with the arm 3c of the classic screen switching lever 3, The classic screen switching lever 3 is driven in the longitudinal direction of the long holes 10a and 10b.
Reference numeral 11 denotes a second classic blade. The long hole 11a is on the axis 1j of the prism box 1, and the long hole 11b is on the prism box 1.
Is installed on the prism box 1 in a state where it is inserted into the shaft 1k of FIG. 1, the hole 11c is engaged with the arm 3d of the classic screen switching lever 3, and the classic screen switching lever 3 is driven in the longitudinal direction of the long holes 11a and 11b. Is done.

The first panorama blade 8, the second panorama blade 9, the first classic blade 10, the second classic blade 11
Are formed of a thin plate, and as shown in FIG. Reference numeral 12 denotes a wide screen field frame, in which a hole 12a is provided on the axis 11 of the prism box 1,
b is inserted into the axis 1m of the prism box 1 and installed on the prism box 1, the square hole 12c forms a field frame corresponding to a wide-size photographing screen, and the square hole 12d forms a display frame in the viewfinder. Reference numeral 13 denotes a hollow penta roof mirror which is an optical element functioning as a penta prism. Note that the hollow penta roof mirror 13 may use a penta prism.

FIG. 2 is a diagram for explaining how the panorama screen switching lever 2 and the classic screen switching lever 3 are driven by the switching drive lever 4. As shown in FIG. As a result, a panoramic screen, a wide screen, and a classic screen (a screen of a normal size in a camera using 135 film) can be selected. The panorama screen switching lever 2 is biased by a biasing spring (not shown) so as to rotate clockwise around the axis 2a, and the classic screen switching lever 3 pivots the shaft 3a by a biasing spring (not shown). It is biased to rotate counterclockwise around the center.

FIG. 2A shows a panoramic state in which the switching drive lever 4 is operated to the rightmost position in the figure. The panorama screen switching lever 2 is turned rightward to the panorama light blocking position by the urging force of the spring, and the classic screen switching lever 3 is a surface on which the arm 3b is provided on the switching drive lever 4 while receiving the urging force of the spring. By contacting 4d, it stays at the blade retreat position. As a result, the first and second panoramic blades 8 and 9 are located at the panorama light-shielding position, and the first and second classic blades 10 and 11 are outside the wide screen, so that the finder screen shows a panoramic screen.

FIG. 2B shows a wide screen state in which the switching drive lever 4 is operated to the wide screen position. The panorama screen switching lever 2 receives the urging force of the spring while the arm 2b
Abuts on the surface 4c provided on the switching drive lever 4 to stay at the blade retreat position. The classic screen switching lever 3 is provided with the arm 3b on the switching drive lever 4 while receiving the biasing force of the spring. The blade 4a stays at the blade retreat position by contacting the surface 4d. Accordingly, the first and second panoramic blades 8 and 9 are placed outside the wide screen, and the first and second classic blades 10 and 11 are placed outside the wide screen. Therefore, the finder screen shows the wide screen.

FIG. 2C shows a classic state in which the switching drive lever 4 is operated to the leftmost position in the figure. The panorama screen switching lever 2 stays at the blade retreat position when the arm 2b abuts on the surface 4c provided on the switching drive lever 4 while receiving the urging force of the spring. 3b is dropped into the groove 4e of the switching drive lever 4 by the biasing force of the spring, and is turned leftward to the classic light blocking position. As a result, the first and second panoramic blades 8 and 9 are placed outside the wide screen, and the first and second classic blades 10 and 11 are placed in the classic light blocking position, so that the finder screen shows the classic screen.

FIG. 3 is a diagram showing a panoramic screen forming operation by the panoramic blades 8 and 9. The first panoramic blade 8 is installed so that the long hole 8a is inserted into the shaft 1h and the long hole 8b is inserted into the shaft 1i so as to be movable in the longitudinal direction of the long holes 8a and 8b, and the hole 8c is engaged with the shaft 2c. Thus, the rotational force of the panorama screen switching lever 2 is transmitted. The second panoramic blade 9 has the long hole 9a inserted into the shaft 1h and the long hole 9b inserted into the shaft 1i, and the long holes 9a and 9b are inserted.
Is installed so that it can move in the longitudinal direction of the
The rotational force of the panorama screen switching lever 2 is transmitted by engaging with d. A square frame 12c indicated by a two-dot chain line is
A wide screen frame provided on the upper side, and a square frame 12 d indicates a display frame in the finder provided on the visual field frame 12. First,
Display frame 12d in viewfinder for both second panorama blades 8 and 9
It is formed so as not to enter inside.

FIG. 3A shows a panoramic blade light shielding state. The panorama screen switching lever 2 is turned right around the axis 2a, and the first panorama blade 8 is driven to the position where the end face 8d enters the wide screen in conjunction with the axis 2c. Further, the second panoramic blade 9 is driven to the position where the end face 9d enters the wide screen in conjunction with the axis 2d. Thus, a panoramic screen is formed in the finder screen by the end faces 8d and 9d.

FIG. 3B shows the panoramic blade retreat state. The panorama screen switching lever 2 is turned to the left around the axis 2a, and the first panorama blade 8 is driven to the position where the end face 8d is retracted outside the wide screen in conjunction with the axis 2c. The second panoramic blade 9 is linked to the shaft 2d and the end face 9
It is driven to a position where d is retracted outside the wide screen.

FIG. 4 is a diagram showing a classic screen forming operation by the classic blades 10 and 11. The first classic blade 10 has the long hole 10a on the shaft 1j and the long hole 10b on the shaft 1k.
And the hole 10c is installed to be movable in the longitudinal direction of the long holes 10a and 10b. The hole 10c is engaged with the shaft 3c to transmit the torque of the classic screen switching lever 3. The second classic blade 11 is installed so that the long hole 11a is inserted into the shaft 1j and the long hole 11b is inserted into the shaft 1k so as to be movable in the longitudinal direction of the long holes 11a and 11b, and the hole 11c is engaged with the shaft 3d. Thus, the torque of the classic screen switching lever 3 is transmitted. A square frame 12c indicated by a two-dot chain line indicates a wide screen frame provided on the field frame 12, and a square frame 12d indicates a viewfinder display frame provided on the field frame 12.

FIG. 4A shows a classic blade light-shielded state. The classic screen switching lever 3 is turned left around the axis 3a, and the first classic blade 10 is driven to the position where the end face 10d enters the wide screen in conjunction with the axis 3c. The second classic blade 11 is driven to the position where the end face 11d enters the wide screen in conjunction with the shaft 3d. Thus, a classic screen is formed in the finder screen by the end faces 10d and 11d.

FIG. 4B shows the classic blade retracted state. The classic screen switching lever 3 is turned right around the axis 3a, and the first classic blade 10 is driven to the position where the end face 10d is retracted outside the wide screen in conjunction with the axis 3c. Further, the second classic blade 11 is driven to the position where the end face 11d is retracted outside the wide screen in conjunction with the shaft 3d.

The second classic blade 11 has surfaces 11e, 11f, 1f at positions corresponding to the display frame 12d in the finder.
1g, there is a notch 11h formed by the end face 1
When 1d is retracted outside the wide screen, the display frame 12d in the viewfinder is not interrupted. Also, the first
The classic blade 10 has a notch 10h formed by surfaces 10e, 10f, and 10g that are symmetrical to the second classic blade 11. In this way, the second
Since the classic blade 11 has the cutout portion 11h, when the second classic blade 11 is retracted from the finder screen, it is not necessary to retreat beyond the finder display frame 12d, and the finder display frame 12d is removed. There is no hiding.

FIG. 5 is a view showing a finder visual field. FIG. 5A shows a panoramic light shielding state. The upper part of the finder screen is shielded from light by the first panoramic blade 8, and the lower part of the finder screen is shielded from light by the second panoramic blade 9. The shooting range when the panorama screen is selected is shown between the end faces 8d and 9d. FIG.
(B) shows the state when the wide screen is selected. A screen frame 12c on the field frame 12 and a display frame 12d in the finder are shown.

FIG. 5C shows a classic light shielding area. The left of the finder screen is shielded from light by the first classic blade 10 and the right of the finder screen is shielded from light by the second classic blade 11. The shooting range when the classic screen is selected is 10
d and 11d. A line (dotted line) connecting the cutout surfaces 10f and 11f of the classic blade is located at substantially the same position (height) as the end surface 8d at the light shielding position of the first panoramic blade 8, and a line connecting the cutout surfaces 10g and 11g. The (dotted line) is configured so as to be located at substantially the same position (height) as the end surface 9d of the second panoramic blade 9 at the panoramic light shielding position. Thereby, the photographer can also confirm the screen size at the time of panoramic photography by the lines of the cutout surfaces 10f and 11f and the lines of the cutout surfaces 10g and 11g at the time of classic light shielding. In addition, notch 10h
And the notch 11h, it is possible to confirm the horizontal screen edge at the time of wide-screen shooting.

FIG. 6 is a vertical sectional view including an optical axis of a camera having a finder screen size switching device according to the present embodiment. The hollow pentadach mirror 13 is the first,
It is composed of a reflecting portion 13a forming a second reflecting surface and a reflecting portion 13b forming a third reflecting surface. Reference numeral 21 denotes a quick return mirror, and reference numeral 22 denotes a mirror tilter that supports the mirror 21, and is supported by a mirror box (not shown) so as to be rotatable about a shaft 22a. The panoramic blades 8 and 9 and the classic blades 10 and 11 are all housed in a space between the hollow penta roof mirror 13 and the prism box 1. 19 is a cover for covering the camera.

As shown in FIG. 6, the classic screen switching lever 3 is disposed in a space formed between the obliquely arranged third reflecting surface 13b and the camera cover 19, and the panoramic screen switching lever 2 is similarly disposed. Is placed in that space. Further, the switching drive lever 4 for driving the panorama screen switching lever 2 and the classic screen switching lever 3 is also provided below the third reflecting surface, that is, in the space created between the third reflecting surface and the camera cover 19 as shown in the figure. It is arranged in a continuous space. The space created between the third reflection surface and the camera cover 19 is a dead space, and the space that continues downward is also a dead space. In the present embodiment, some members of the finder screen size switching device are arranged by effectively utilizing the dead space generated in the camera as described above, thereby realizing a compact camera.

Further, in the first embodiment, it is not necessary to dispose the driving mechanism for the finder screen light shielding member in the lateral direction of the finder screen light shielding member as in the conventional camera driving mechanism 112 in FIG. It is not necessary to provide the notch 111a of the mirror box 111. Thereby, it is not necessary to make a part of the mirror box 111 thin, and the thickness of the mirror box 111 can be made uniform as shown by a dotted line in FIG.
The strength can be ensured without increasing the size of the first.

In the first embodiment, the panorama screen switching lever 2 and a part of the classic screen switching lever 3 are arranged in a space formed between the third reflecting surface 13b and the camera cover 19, The remaining portion is arranged in a space extending downward from the space, but all of the panorama screen switching lever 2 and the classic screen switching lever 3 are placed in the space formed between the third reflection surface 13 b and the camera cover 19. It may be arranged, or conversely, the whole may be arranged in a space continuing in the lower direction. In the former case, the dead space is completely used effectively, and in the latter case too, the dead space is fully used effectively. The same applies to the switching drive lever 4.

Second Embodiment In the first embodiment, the display in the viewfinder is arranged at a position visible on the left side of the viewfinder screen (FIG. 5). However, in the second embodiment, the display in the viewfinder screen is displayed. It is arranged at a position visible on the lower side (FIG. 7). Therefore, the second embodiment is different from the second embodiment in that a notch is provided so that the display in the viewfinder disposed below the viewfinder is not hidden when the panoramic blade is retracted. It is different from the form. That is, the first embodiment differs from the first embodiment in that a cutout is provided in the classic blade, whereas the second embodiment has a notch provided in the panoramic blade. Since the driving mechanisms of the panoramic blade and the classic blade are common to those of the first embodiment, a description thereof will be omitted, and only the viewfinder field will be described below.

FIG. 7 is a view showing a finder visual field according to the second embodiment. FIG. 7A shows a panoramic light shielding state. The lower part of the finder screen is shielded from light by the first panoramic blades 14 and the upper part of the finder screen is shielded from light by the second panoramic blades 15. The shooting range when the panorama screen is selected is shown between the end faces 14d and 15d. The first panorama blade 14 has a notch 1 surrounded by notches 14e, 14f, and 14g for avoiding the display area 18d in the viewfinder.
4h, and the second panoramic blade 15 has the first
Notch 15h surrounded by notch surfaces 15e, 15f, 15g symmetrical to notch 14h of panoramic blade 14
Is provided. The line (dotted line) connecting the cutout surfaces 14f and 15f is located at substantially the same position as the end surface 16d of the first classic blade 16 at the classic light blocking position, and the line (dotted line) connecting the cutout surfaces 14g and 15g is the second classic blade. End face 17 at 17 classic light blocking positions
It is configured to be located at substantially the same position as d. Thereby, the photographer can also confirm the screen size at the time of classic shooting by the lines of the cutout surfaces 14f and 15f and the lines of the cutout surfaces 14g and 15g at the time of panoramic light shielding. The notch 14h and the notch 15h make it possible to confirm the vertical screen edge during wide-screen shooting.

In the above-described embodiment, the size of another finder screen can be confirmed by using the cutout portion. However, the present invention is not limited to this mode. A mark or small notch may be formed on the light shielding member at a position corresponding to another finder screen size position. In the above-described first and second embodiments, the notches are individually provided in the up-down direction and the left-right direction. However, the notches are provided in both the up-down direction and the left-right direction at the same time. You may do so. Alternatively, one may be a notch and the other may be the above-described mark or the like.

In the above-described embodiment, the wide screen is defined by the wide screen field frame 12.
It is not necessary to limit to this content. For example, the aperture of the prism box 1 may be set to the size of a wide screen without using the wide screen field frame 12.

[0034]

Since the present invention is configured as described above, it has the following effects. According to the first and second aspects of the invention, at least a part of the driving member for driving the light shielding member is disposed in the dead space generated outside the reflection surface of the optical element, so that the strength of the mirror box is secured. Meanwhile, the camera can be made compact. According to the third aspect of the present invention, in addition to the dead space generated outside the reflection surface of the optical element, the dead space adjacent thereto can be effectively used. Claim 4
According to the invention, two driving members for changing the vertical direction and the horizontal direction of the finder screen can be driven by one driving member, and a part of the one driving member is arranged in the above-mentioned dead space. Therefore, the camera can be made more compact while ensuring the strength of the mirror box.

[Brief description of the drawings]

FIG. 1 is a first viewfinder screen size switching device of the present invention.
It is a figure showing composition of an embodiment.

FIG. 2 is a diagram for explaining how a panorama screen switching lever 2 and a classic screen switching lever 3 are driven by a switching drive lever 4;

FIG. 3 is a diagram illustrating a panoramic screen forming operation by panoramic blades 8 and 9;

FIG. 4 is a diagram showing a classic screen forming operation by the classic blades 10 and 11;

FIG. 5 is a view showing a finder visual field;

FIG. 6 is a view showing a vertical sectional view including an optical axis of a camera having a finder screen size switching device.

FIG. 7 is a second viewfinder screen size switching device according to the present invention;
It is a figure which shows the finder visual field in embodiment.

FIG. 8 is a layout view of a conventional finder device.

FIG. 9 shows a conventional light shielding member 1 for a display prism 103 in a finder and a display device 102 in a finder.
FIG. 9 is a diagram of disposing it outside of a retreat position 09.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Prism box 2 Panorama screen switching lever 3 Classic screen switching lever 4 Switching drive lever 5 Viewfinder screen 6 Viewfinder display element 7 Viewfinder display prism 8,14 First panorama blade 9,15 Second panorama blade 10,16 First classic Blade 11, 17 Second classic blade 12 Wide screen field frame 13 Hollow pentadach mirror 19 Cover 20 Operation transmission member 21 Quick return mirror 22 Mirror duster

Claims (4)

[Claims] An optical element that forms a finder image of a single-lens reflex camera; a light-shielding member that is located at a bottom side of the optical element and that switches a finder screen size by appearing in an optical path of the finder image; A finder device for a single-lens reflex camera comprising a driving member for driving, wherein the optical element is in contact with a bottom surface of the optical element, and is formed obliquely so that an upper part protrudes from a lower part in front of the camera. Wherein the driving member is disposed at least partially in a space formed outside the optical element by the oblique formation of the reflection surface. Camera viewfinder device. 2. The finder device for a single-lens reflex camera according to claim 1, wherein said light-shielding member changes a vertical dimension of a finder screen and a horizontal dimension of the finder screen. A second light-blocking member, wherein the driving member comprises a first driving member for driving the first light-blocking member, and a second driving member for driving the second light-blocking member. A finder device for a single-lens reflex camera, wherein at least a part of each of the first driving member and the second driving member is disposed in the space. 3. A finder device for a single-lens reflex camera according to claim 1, wherein said space is formed in a direction from a space formed outside said optical element to a lower part of said camera due to said reflection surface being formed obliquely. A viewfinder device for a single-lens reflex camera, characterized by including a space extending in a direction. 4. A finder device for a single-lens reflex camera according to claim 2, further comprising a third driving member comprising a member for driving said first driving member and said second driving member in conjunction with each other. The space includes a space extending in a camera lower direction from a space formed outside the optical element due to the oblique formation of the reflection surface, and at least a part of the third driving member is the space. A finder device for a single-lens reflex camera, wherein the finder device is arranged in a camera.