JPH0732644U - Viewfinder field size switching device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a visual field frame size switching device having an extremely simple configuration. [Composition] It is rotatable about the rotation axis, the viewfinder field is the first size at the first rotation position, the viewfinder field is the second size at the second rotation position, and the viewfinder field is the third size at the third rotation position. A pair of visual field size changing members; a switching member having first, second and third switching positions and capable of linear movement between the respective positions; and a pair of visual fields for linear movement of the switching member to the first switching position. The visual field size changing member is transmitted to the size changing member as a rotational movement to rotate the visual field size changing member to the first rotation position, and the rectilinear movement of the switching member to the second switching position is transmitted to the pair of visual field size changing members as a rotational movement to make the visual field size changing member. To a second rotational position, and a linear movement of the switching member to the third switching position is transmitted to the pair of visual field size changing members as rotational movement to rotate the visual field size changing member to the third rotational position. Finder field-of-view size switching device.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a finder field size switching device that switches the size of a finder field to two or more different sizes.

[0002]

[Prior art and its problems]

 So-called panoramic size photography and high-definition size photography are landscape printing photographs that do not use the fixed width of two opposite sides of the film frame in the short direction (vertical direction when the camera is held in a normal state) for drawing. It refers to the technique of photographing and printing. In order to prevent the upper and lower fixed width of this film frame from being used for drawing, the upper and lower fixed width of the film is normally shielded from light.

In a camera having such a panorama size shooting function and a high-definition size shooting function, for example, a pair of screen regulation plates are advanced from above and below the shooting opening in conjunction with switching to the panorama size shooting mode. As a result, there is one that blocks a certain width above and below the shooting screen. In such a camera, in order to give the photographer a real sense of the range that can be photographed by the shooting screen that shields a certain amount of light from above and below, a pair of vertical fields of view within the viewfinder are linked in conjunction with changing the vertical width of the shooting screen. We are expanding the frame control plate.

By the way, such a field frame size is divided into a first size corresponding to a normal 35 mm full size, a second size corresponding to a so-called high-definition size, and a third size corresponding to a so-called panoramic size. It is desirable that the alternative switching structure be as simple as possible in consideration of the compactness of the camera.

[0005]

[The purpose of the device]

 The present invention has been made based on the above-mentioned awareness of the problem of the viewfinder visual field size switching device, and an object thereof is to provide a visual field frame size switching device having an extremely simple configuration.

[0006]

[Outline of the device]

 The present invention for achieving the above object is a finder visual field size switching device for switching the finder visual field size to two or more different sizes, which is rotatable about rotation axes along two opposite sides of the finder visual field. At the first rotation position, the finder field is set to the first size, at the second rotation position, two opposite sides of the finder field are shaded by a predetermined width to make the second size, and at the third rotation position, the finder field is set to the second size. A pair of visual field size changing members, each of which has a third size by shielding two opposite sides from each other by a predetermined width; a switching member having first, second and third switching positions and capable of linear movement between the respective positions. And a linear movement of the switching member, which is provided between the pair of visual field size changing members and the switching member, to the first switching position is transmitted to the pair of visual field size changing members as rotational movement. The field size changing member is rotated to the first rotation position, and the linear movement of the switching member to the second switching position is transmitted to the pair of visual field size changing members as rotational movement to cause the visual field size changing member to the second rotation position. A transmission means for rotating the visual field size changing member to the third rotational position by transmitting the linear movement of the switching member to the third switching position to the pair of visual field size changing members as rotational movement. It is characterized by having.

Further, the present invention has a rotation axis along two opposite sides of the viewfinder field, and a field size changing member for switching the view size to a different size by rotation of the rotation axis; for rotating the view size changing member. A linearly operated switching member; a pair of elastic legs having spring properties that move by the movement of the switching member; and a pair of elastic legs provided on the rotation shafts of the pair of visual field size changing members. The pair of elastic legs and the engaging portion rotate the pair of rotating shafts by the reciprocating movement force of the elastic legs accompanying the movement of the switching member. The characteristic is that the visual field size changing member is shaped to rotate to each position corresponding to a different visual field size.

[0008]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 1 is a perspective view showing a finder visual field size switching device to which the present invention is applied in an exploded state. The finder visual field size switching device 11 shown in the figure is mounted on a camera (not shown) in its assembled state.

In FIG. 1, the finder frame 12 included in the finder visual field size switching device 11 includes a prism housing portion 19 for housing the prism 41, a lens housing portion 10 for housing the objective side lens 27, and light of the finder optical system. It has a rotary support groove 14a and a rotary support hole 15a positioned so as to sandwich the axis O, a rotary support groove 14b and a rotary support hole 15b, and an engagement hole 16 in the upper wall 12a. Further, on the eyepiece side of the lens 27, a frame member 30 for forming a first size of a horizontally long rectangular finder field frame is provided.

The finder frame body 17 included in the finder visual field size switching device 11 guides a lens housing portion 17a for housing a lens 31 on the eyepiece side and positioning projections 32, 33 on both sides of the lens 31, respectively. It has guide grooves 17b and 17c, and engaging protrusions 17d and 17e which are projected upward. The lens housing portion 17a of the finder frame body 17 is formed so that the direction in which the lens 31 is to be housed is orthogonal to the lens housing portion 10 of the finder frame body 12, and its position differs from that of the lens housing portion 10. It is formed so that.

The support member 25 guides the positioning protrusions 32 and 33 of the lens 31 to the guide grooves 17b and 17c, respectively, and stores the lens 31 in the lens housing portion 17a. Are engaged with the engaging projections 17d and 17e formed to project above the finder frame 17.

As shown in FIGS. 1 and 2, the field-of-view size changing member 42 is rotatably supported by a rotation shaft 45 rotatably supported in the rotation support groove 14 a of the finder frame 12 and a rotation support hole 15 a. Has a rotating shaft 46 fitted therein. The field-of-view size changing member 43 has a rotary shaft 47 rotatably supported in the rotary support groove 14b of the finder frame 12 and a rotary shaft 49 rotatably fitted in the rotary support hole 15b.

The field-of-view size changing members 42 and 43 are arranged along the two opposite sides of the finder field F (see FIGS. 5, 6, and 7) formed by the frame member 30 as a horizontally long rectangular shape. It is rotatable about the rotary shafts 45 and 46 and the rotary shafts 47 and 49, and in the first rotation position, the finder field F is set to the first size (see FIG. 5) corresponding to the normal 35 mm full size, and At the second rotation position, two opposing sides of the viewfinder field F are shielded with a predetermined width to form a second size, so-called high-definition size (see FIG. 6), and at the third rotation position, the viewfinder field F faces each other. It is possible to form a third size, so-called panoramic size (see FIG. 7), by shielding the two sides with a predetermined width. The visual field size changing members 42, 43 are provided with light shielding portions 42a, 43a for shielding the two opposing sides of the rectangular finder visual field F with a predetermined width at their central portions. have. Rotation guide grooves (engaging notch portions, engaging portions) 46a and 49a are formed in the rotating shafts 46 and 49 of the visual field size changing members 42 and 43, respectively.

In FIG. 1, a support protrusion 13 having an internal thread 13 a is formed at a position adjacent to the finder frame 12. The slide guide 50 is positioned and fixed to the support protrusion 13 by screwing a positioning screw 61 inserted through the screw insertion hole 50a into the female screw 13a. This slide guide 50 has a guide portion 50b formed on the side of the screw insertion hole 50a in the direction of arrow B in FIG. 2 that is elongated along the directions of arrows A and B in FIG. On the guide portion 50b, sliding support protrusions 50c projecting in the arrow C and D directions orthogonal to the arrow B direction in the figure (the one on the arrow D direction side is not shown). Are formed. Further, the slide guide 50 has sliding contact taper surfaces 50d and 50e on the upper and lower sides of the guide portion 50b along the arrow C and D directions on the arrow B direction side. At the end of the guide portion 50b in the direction of the arrow A in the figure, a regulation portion 50f for regulating the maximum movement amount of the elastic leg portion 59 is formed.

The positioning screw 61 has a head portion 61c, a male screw portion 61a, and a sliding support portion 61b that is located between the head portion 61c and the male screw portion 61a and is not formed with a male screw.

On the front side of the slide guide 50 in FIG. 1, a slide lever 55 forming a switching member is positioned by inserting a positioning screw 61 into a slide hole 56 described later. The slide lever 55 is made of a metallic material having a spring property (elasticity), and is integrally formed with the main body 56, a pair of elastic legs 59 and 60 integrally formed with the main body 56, and the main body 56. The operation force receiving portion 57 is formed, and the brushes 62 a and 62 b are formed integrally with the operation force receiving portion 57.

The main body portion 56 has a rectangular slide guide hole 56a that is long in the directions of arrows A and B in FIG. The dimension of the slide guide hole 56a in the directions of arrows C and D (short direction) in the figure is set to be smaller than the diameter of the head 61c of the inserted positioning screw 61, and the sliding of the positioning screw 61 is performed. It is slidably supported by the support portion 61b.

The elastic legs 59 and 60 each have a spring property and are press-worked integrally with the main body 56, so that the linear sliding portions 59a and 60a face each other. Each base portion is bent at a connecting portion 58 following the portion 56. The opposing elastic legs 59 and 60 are separated from each other by a width slightly larger than the width of the guide portion 50b of the slide guide 50 in the directions C and D in FIG. 2, and the guide portion 50b is sandwiched in the same direction. The portion 50b and the sliding support protrusion 50c are slidably guided in the directions of arrows A and B in the figure. As a result, the slide lever 55 is supported so as to be reciprocally movable (linear movement) in the directions of arrows A 1 and B 2 in FIG.

The elastic leg portions 59 and 60 are formed continuously with the tip ends of the linear sliding portions 59a and 60a with three different inclination angles, and the rotation guiding portions 59b, 59c and 59d and the rotation portion. It has guide parts 60b, 60c, and 60d. The rotation guide portions 59b, 59c, 59d and the rotation guide portions 60b, 60c, 60d are formed so as to have a line-symmetrical relationship with each other. Further, the end of the linear sliding portion 59a facing in the direction of arrow A in the figure abuts against the regulating portion 50f when moving in the direction of arrow A in the figure, so that the elastic leg 59, that is, the slide lever 55, moves in the same direction. The contact portion 59e for determining the maximum amount of movement in

The rotation guide portions 59 b, 59 c, 59 d are respectively engaged with the rotation guide grooves 46 a of the rotation shaft 46 of the visual field size changing member 42. When the slide lever 55 moves in the direction of the arrow A in FIG. 3 by the maximum amount, the rotation guide portion 59d engages the rotation guide groove 46a with the rotation guide portion 59b or 59c to set the field size to the second size or the third size. The field-of-view size changing member 42, which has been switched to, is rotated counterclockwise to switch the finder field of view F to the first size. The rotation guide portion 59c engages the rotation guide groove 46a with the rotation guide portion 59d or 59b when the slide lever 55 moves to a predetermined position located substantially at the center in the directions of arrows A and B in FIG. The field-of-view size changing member 42 whose size is switched to the first size or the third size is rotated clockwise or counterclockwise to switch the finder field F to the second size. When the slide lever 55 moves in the direction of the arrow B in the figure by the maximum amount, the rotation guide portion 59b engages the rotation guide groove 46a with the rotation guide portion 59d or 59c to change the visual field size to the first size or the second size. The field-of-view size changing member 42, which has been switched to the size, is rotated clockwise to switch the finder field F to the third size.

The rotation guide portions 60 b, 60 c, 60 d are respectively engaged with the rotation guide grooves 46 a of the rotation shaft 46 of the visual field size changing member 42. When the slide lever 55 moves in the direction of arrow A in FIG. 3 by the maximum amount, the rotation guide portion 60d engages the rotation guide groove 46a with the rotation guide portion 60b or 60c to set the field size to the second size or the third size. The field-of-view size changing member 42 that has been switched to is rotated clockwise to switch the finder field F to the first size. Further, when the slide lever 55 moves to a predetermined position where the slide lever 55 is located substantially at the center in the directions of the arrows A and B in the figure, the rotation guide portion 60c engages the rotation guide groove 46a with the rotation guide portion 60d or 60b so that the visual field. The field-of-view size changing member 42 whose size is switched to the first size or the third size is rotated counterclockwise or clockwise to switch the finder field F to the second size. When the slide lever 55 moves in the direction of the arrow B in the figure by the maximum amount, the rotation guide portion 60b engages the rotation guide groove 46a with the rotation guide portion 60d or 60c to set the field size to the first size or the second size. The field-of-view size changing member 42, which has been switched to the size, is rotated counterclockwise to switch the finder field F to the third size.

On the other hand, the operation force receiving portion 57 includes an engagement notch 57 a opened in the direction of arrow D in FIG. 2 and brushes 62 a, 62 b integrally formed with the operation force receiving portion 57 by press working. have. The engagement notch 57a is engaged with a three-position changeover type changeover switch (not shown) which is projected to the back cover side of the camera (not shown). The three positions of this switching switch are the position for switching the shooting screen to normal shooting with a normal 35mm full size, the position for switching the shooting screen to high-definition size shooting with the so-called high-definition size, and the shooting This is the position for switching to so-called panorama size photography, where the screen is of the so-called panoramic size.

Since the bases of the brushes 62a and 62b are integrally formed with the operation force receiving portion 57, they are electrically connected to each other, and when the slide lever 55 moves straight, the land portions 65a and 65b of the cord plate 63, Each can slide on the 65c. Therefore, when the slide switch 55 is moved straight in the directions of arrows A and B in FIG. 3 by switching the changeover switch, the photographing state to be changed is detected depending on the contact state between the brushes 62a and 62b and the code plate 63. Based on this, the photographing screen is switched to the normal 35 mm full size, high-definition size or panoramic size by a switching mechanism (not shown), and at the same time, the field-of-view size changing members 42 and 43 are rotated so that the finder field F becomes the full size. , High-definition size or panoramic size can be switched.

As shown in FIG. 1, the finder visual field size switching device 11 further includes, in the rotary support grooves 14a and 14b and the rotary support holes 15a and 15b, the rotary shaft portions 45 and 46 of the visual field size changing members 42 and 43. The cover member 36 is fitted and fixed to the finder frame 12 in a state where the rotary shaft portions 47 and 49 are fitted to each other and the prism 41 is housed in the finder frame 12. The cover member 36 has an engaging hook 37 projectingly formed on the upper portion thereof engaged with the engaging hole 16 of the finder frame 12, and an engaging projection 40 projecting laterally on the finder frame 12 side. 21 is fixed to the finder frame 12.

FIG. 4 shows the viewfinder optical system of the viewfinder field size switching device 11 viewed from a direction different from that of FIG. 1, and has lenses 70, 72, 73 on the object side of the lens 27, It also has a reflector 71 arranged between the lens 70 and the lens 72. Therefore, the light incident from the subject side is guided to the lens 31 via the lenses 73 and 72, the reflection plate 71, the lenses 70 and 27, and the prism 41. In addition, in FIG. 1, 29 at the center of the lens 27 is an AF detection zone.

The finder visual field size switching device 11 having the above-described configuration can be operated as follows. For example, when performing high-definition size photography, first, the changeover switch projecting to the rear of the camera is operated from the normal photography or panoramic size photography side toward the high-vision size photography side. Then, the slide lever 55 located on the arrow A direction or B direction side in FIG. 3 moves straight toward the center position between the arrow A direction and the B direction in FIG. The brush 62a that is in contact only with the brush 62a and 62b that is in contact with the lands 65a and 65b moves, and the brush 62b comes into contact with the land 65c. It is detected that the mode has been switched to size photography. Based on this, the shooting screen is switched from normal 35mm full size shooting or panorama size shooting to high definition size shooting by a switching mechanism (not shown).

At the same time, the rotation guide portions 59d and 60d are engaged with the rotation guide grooves 46a and 49a, respectively, and the visual field size changing members 42 and 43 are rotated counterclockwise and clockwise in FIG. The elastic legs 59 and 60 having the first size are moved in the rotation guide grooves 46a and 49a while being appropriately bent by their springiness, and the rotation guide portions 59c and 60c are moved to the rotation guide grooves 46a and 49a. The guide grooves 46a, 49a for rotation, that is, the visual field size changing members 42, 43 are rotated in the clockwise direction and the counterclockwise direction in FIG. Therefore, the visual field size changing members 42 and 43 cause the light blocking portions 42a and 43a of the visual field size changing members 42 and 43 to enter toward the finder optical axis O in the finder optical path, respectively, and are designated by n in the figure. The one size is switched to the second size indicated by h in the figure. Alternatively, the rotation guide portions 59b and 60b are engaged with the rotation guide grooves 46a and 49a, respectively, and the visual field size changing members 42 and 43 are rotated clockwise and counterclockwise in FIG. The elastic leg portions 59 and 60 having the third size move in the rotation guide grooves 46a and 49a while appropriately bending due to their springiness, and the rotation guide portions 59c and 60c are moved to the rotation guide groove 46a. , 49a, and the rotation guide grooves 46a, 49a, that is, the visual field size changing members 42, 43 are rotated in the counterclockwise and clockwise directions in FIG. Therefore, the field-of-view size changing members 42 and 43 separate the light-shielding portions 42a and 43a of the field-of-view size changing members 42 and 43 from the viewfinder optical axis O in the viewfinder optical path, and set the third size shown by p in the figure to the same size. Switch to the second size indicated by h in the figure, and make it the size corresponding to the high-definition size shooting screen.

When performing panoramic size shooting, the changeover switch protruding rearward of the camera is operated from the normal shooting or high definition size shooting side to the panorama size shooting side. Then, the slide lever 55 located on the arrow A direction side in FIG. 3 moves straight in the arrow B direction in the figure, so that the brushes 62a and 62b contacting the land portions 65a and 65b of the code plate 63, respectively. , Or the brushes 62a and 62b that were in contact with the land portions 65a and 65c respectively move, and the brush 62b moves away from the land portions 65b and 65c, the read signal changes and the photographing state is switched to panorama size photographing. Is detected. Based on this, the shooting screen is switched from normal 35mm full size shooting or high definition size shooting to panorama size by a switching mechanism not shown.

At the same time, the rotation guide portions 59d and 60d are engaged with the rotation guide grooves 46a and 49a, respectively, and the visual field size changing members 42 and 43 are rotated counterclockwise and clockwise in FIG. The elastic leg portions 59 and 60 having the first size or the second size move in the rotation guide grooves 46a and 49a while appropriately bending due to their spring properties to guide the rotation guide portions 59c and 60c to the rotation. It is inserted into the grooves 46a, 49a, and the rotation guide grooves 46a, 49a are rotated along the inclination angle thereof, and the rotation guide portions 59b, 60b make the rotation guide grooves 46a, 49a, that is, the visual field size changing member 4. 2, 43 are rotated in the clockwise direction and the counterclockwise direction in FIG. Therefore, the light-shielding portions 42a and 43a of the visual field size changing members 42 and 43 are made to enter toward the finder optical axis O in the finder optical path, and the first size indicated by n in the figure or the first size indicated by h. The two sizes are switched to the third size indicated by p in the figure, and the size corresponds to the panorama size shooting screen.

On the other hand, after the panorama size shooting and the high vision size shooting, when the shooting screen is returned to the normal 35 mm full size, the selector switch is operated from the panorama size shooting or the high vision size shooting side to the normal shooting side. . As a result, the slide lever 55 located on the arrow B direction side in FIG. 3 moves straight in the arrow A direction in the figure, so that the cord plate 63 is not in contact with the lands 65b and 65c or in the land portion. Since the brush 62b, which has been in contact with 65c, is in contact with the land portion 65b, the read signal is changed, and accordingly, it is detected that the photographing state is switched to normal photographing. Based on this, the shooting screen is switched from the panorama size or hi-vision size to the normal 35 mm full size by a switching mechanism not shown.

At the same time, the rotation guide portions 59b and 60b are engaged with the rotation guide grooves 46a and 49a, respectively, and the visual field size changing members 42 and 43 are rotated clockwise and counterclockwise in FIG. The elastic leg portions 59, 60 having the third size or the second size move in the rotation guide grooves 46a, 49a while appropriately bending due to their spring properties, and guide the rotation guide portions 59c, 60c for rotation. It is inserted into the grooves 46a, 49a, and the rotation guide grooves 46a, 49a are rotated along the inclination angle thereof, and the rotation guide portions 59d, 60d make the rotation guide grooves 46a, 49a, that is, the visual field size changing member 4. 2, 43 are rotated counterclockwise and clockwise in FIG. Therefore, the light-shielding portions 42a, 43a of the visual field size changing members 42, 43 are separated from the finder optical axis O in the finder optical path so that the third size shown by p or the second size shown by h in FIG. Switch to the first size indicated by n in the figure, and make it the size corresponding to the normal 35mm full-size shooting screen.

[0032]

[Effect of device]

 As described above, according to the present invention, it is possible to provide a visual field frame size switching device having an extremely simple structure, which can contribute to downsizing of a camera and the like.

[Brief description of drawings]

FIG. 1 is a perspective view showing a finder visual field size switching device to which the present invention is applied in an exploded state.

FIG. 2 is a perspective view showing a main part of the finder visual field size switching device.

FIG. 3 is a side view showing a main part of the finder visual field size switching device.

FIG. 4 is a perspective view showing a finder optical system of the finder visual field size switching device.

FIG. 5 is a front view showing the finder field of the finder field size switching device in a normal photographing state.

FIG. 6 is a front view showing the finder field of the finder field size switching device in a high-vision size shooting state.

FIG. 7 is a front view showing a viewfinder field of the same viewfinder field size switching device in a panoramic size shooting state.

[Explanation of symbols]

11 viewfinder field size switching device 12 viewfinder frame body 14a 14b rotation support groove 15a 15b rotation support hole 20 viewfinder field frame 42 43 view field size changing member 42a 43a light shielding part 45 46 47 49 rotation shaft 46a 49a rotation guide groove (notch notch) Part, engaging part,
Transmission means) 50 Slide guide 50a Screw insertion hole 50b Guide portion 50c Sliding support protrusion 50d 50e Sliding contact taper surface 50f Restricting portion 55 Slide lever (switching member) 56 Main body portion 56a Sliding guide hole 57 Operating force receiving portion 59 60 Elastic Leg portion 59a 60a Linear sliding portion 59b 59c 59d 60b 60c 60d Rotation guide portion (transmitting means) 59e Contact portion 61 Positioning screw 61b Sliding support portion 62 Prism 62a 62b Brush 63 Code plate 65a 65b 65c Land portion F Finder field of view O optical axis n h p Ray corresponding to each viewfinder field size

Claims (4)

[Scope of utility model registration request] 1. A viewfinder field size switching device for switching viewfinder field sizes to two or more different sizes, wherein the viewfinder field size switching device is rotatable about rotation axes along two opposing sides of the viewfinder field, and at the first rotation position thereof, The finder field has a first size, and at the second rotation position, the two opposite sides of the finder field are shielded with a predetermined width so as to have a second size, and at the third rotation position, the two opposite sides of the finder field have a predetermined width. A pair of field-of-view size changing members which are shielded from light to have a third size; having first, second and third switching positions,
A switching member capable of linear movement between respective positions; and a pair of the visual field size changing members provided between the pair of visual field size changing members and the switching member for linear movement of the switching member to a first switching position. To the first rotation position to transmit the linear movement of the switching member to the second switching position as rotational movement to the pair of visual field size changing members. The changing member is rotated to the second rotation position, and the linear movement of the switching member to the third switching position is transmitted to the pair of visual field size changing members as rotational movement to move the visual field size changing member to the third rotational position. A finder visual field size switching device, characterized in that it has transmission means for rotating. 2. The switching member according to claim 1, wherein the switching member is a slide lever having a pair of elastic legs opposed to each other having a spring property, and a rotating shaft of the pair of visual field size changing members is the pair of elastic legs. Finder field-of-view size switching device that engages with the part. 3. The rotation guide portion of claim 2, wherein the transmission means has a pair of elastic legs and is continuously formed with three different inclination angles, and the pair of visual field size changing members. Each of the above rotary shafts has
When the pair of visual field size changing members is guided to any one of the three inclination angles of the rotation guide portion, the pair of visual field size changing members is rotated to any one of first, second and third rotation positions. A viewfinder field size switching device that is an engagement cutout portion that engages with a guide portion. 4. A field-of-view size changing member that has a rotation axis along two opposite sides of the viewfinder field and switches the field size to a different size by rotation of the rotation axis; A switching member to be operated; a pair of elastic leg portions having a spring property that moves by the movement of the switching member; and a pair of elastic leg portions provided on the rotation shafts of the pair of visual field size changing members, respectively. An engaging portion that engages with;
The pair of elastic leg portions and the engaging portion rotate the pair of rotating shafts by the reciprocating movement force of the elastic leg portions accompanying the movement of the switching member, and make the visual field size changing member correspond to different visual field sizes. A viewfinder field size switching device characterized by being configured to rotate to each position.