JPH0678945U - Camera with screen size switching mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] With a simple configuration that does not increase the number of parts, a screen size switching mechanism that can switch the size of the viewfinder field to the size corresponding to the screen size according to the switched screen size. Providing a camera with. A camera having a screen size switching mechanism having a screen size switching member for changing a shooting screen size and a finder visual field size switching member for changing a finder field of view according to the shooting screen size, wherein the screen size switching member includes: A camera having a screen size switching mechanism in which at least a part of a viewfinder field size switching member is integrated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a camera having a screen size switching mechanism for changing the screen size of a camera.

[0002]

[Prior art and its problems]

 In recent years, even with a film loaded, it is possible to switch the shooting screen between at least two sizes (35 mm standard size and so-called panoramic size) by a light-shielding plate that moves into the shooting optical path and regulates the shooting screen. Cameras with various screen size switching mechanisms have been developed.

In this type of camera, it is known that the size of the viewfinder field can be switched to a size corresponding to the screen size according to the switched screen size. This type of camera has conventionally been configured with a screen size switching member for switching the shooting screen size and a finder field size switching member for switching the finder field size, each of which is a separate member. Since the interlocking mechanism was indispensable, the number of parts was large, so assembly workability was poor, and a large amount of space inside the camera was required for these mechanisms.

[0004]

[The purpose of the device]

 The present invention has been made in view of the above-mentioned conventional problems, and has a simple configuration that does not increase the number of parts, and adapts the size of the viewfinder field to the screen size according to the switched screen size. It is an object of the present invention to provide a camera having a screen size switching mechanism capable of switching to a desired size.

[0005]

[Outline of the device]

 A camera having a screen size switching mechanism of the present invention has a screen size switching mechanism having a screen size switching member for changing a shooting screen size and a finder field size switching member for changing a viewfinder field according to a shooting screen size. In the camera, at least a part of the screen size switching member and the viewfinder field size switching member are integrated.

[0006]

【Example】

 The present invention will be described below with reference to illustrated embodiments. FIG. 4 is a perspective view of a camera 10 having a screen size switching mechanism to which the present invention is applied, viewed from the back side thereof. The camera 10 has a cartridge chamber 12 and a spool chamber 13 on the left and right of a camera body 11, and between the cartridge chamber 12 and the spool chamber 13, a pair of upper and lower aperture frames 14a and 14b and a pair of left and right apertures. It has a photographing opening 16 for limiting the photographing screen surrounded by the frames 15a and 15b. On one side of the rear wall 17 of the camera body 11, a back cover 19 provided with a film pressing plate 18 is openably and closably provided.

The rear wall 17 has a finder eyepiece window 20 at the center of the upper portion thereof, and a screen size changeover switch 21 on the left side of the finder eyepiece window 20. This switch 21 allows you to slide the left and right sides of the shooting screen into two sizes: standard size of 24mm x 36mm (large screen size) and so-called panoramic size of 13mm x 36mm (small screen size). It is an operation switch for switching to.

FIG. 1 is a schematic diagram showing a screen size switching mechanism 40 and a viewfinder optical system 30 of the camera 10, which are features of the present invention, provided in the camera 10. The real image type finder optical system 30 includes an objective lens 31 as an objective optical system, an image erecting prism 32 as an erecting optical system, a field plate 33 having a photographing range frame, from the objective side optically. And an eyepiece lens 34 as an eyepiece optical system. Between the exit surface of the image erecting prism 32 facing the field plate 33 and the field plate 33, a screen size regulating plate (screen size switching member, light shielding member) 43, which is a component of the screen size switching mechanism 40, is provided. The panoramic visual field frame (finder visual field size switching member, mask member) 60 formed integrally moves forward and backward. The screen size switching mechanism 40 will be described below.

As shown in FIGS. 2 and 3, the screen size switching mechanism 40 provided in association with the photographing opening 16 has a pair of screen size regulation plates 42, 43 configured in an L shape. . The screen size regulation plate 42 has a guide portion 42a and a screen regulation portion 42b which are orthogonal to each other, and an operation portion 42d which is formed by projecting on the back surface of the guide portion 42a, and the screen size regulation plate 43 is orthogonal to each other. It has a guide part 43a and a screen restricting part 43b.

The screen size regulation plate 43 has a panoramic field frame 60 integrally formed integrally therewith at a position offset rearward from one end of the upper portion thereof. As a result, the panorama field frame 60 is provided between the exit surface of the image erecting prism 32 and the field plate 33 facing the field plate 33 when the screen size is switched to the standard size by the screen size switching mechanism 40. When the viewfinder size is set to the normal size corresponding to the standard size and the screen size is switched to the panoramic size, the exit surface of the image erecting prism 32 facing the viewing plate 33 and the field of view are opposed. By advancing with the plate 33, a certain width above and below the finder field can be shielded from light, and the size of the finder field can be made small corresponding to the panorama size. The operation portion 42d is interlocked so as to move in the direction of arrow A in FIG. 2 by moving the screen size changeover switch 21 provided on the rear wall 17 of the camera body 11 in the direction of arrow E in FIG.

Engagement notches 47a and 47b are formed along the longitudinal direction of the guide portion 42a on the outer side surface of the guide portion 42a. One end of a click spring 45 is fixed to a fixing portion (not shown) of the camera body 11 in correspondence with the engaging cutouts 47a and 47b. The engaging cutouts 47a and 47b and the click spring 45. And constitute a click stop mechanism 48.

The engagement notch 47a positions the pair of screen size restriction plates 42 and 43 at the positions shown in FIG. 2 in a state where the locking claw 45b at the other end of the click spring 45 is engaged. , Make the screen size a normal 35 mm size. Further, the engagement notch 47b positions the pair of screen size restricting plates 42 and 43 at the positions shown in FIG. 3 in a state where the locking claw 45b is engaged so that the screen restricting portions 42b and 43b are located above and below the photographing opening 16. Are formed at a predetermined distance from the engagement notch 47a so that the screen size can be configured as a panoramic size.

The screen size regulation plate 42 has a linear guide groove 42c along a longitudinal direction in a guide portion 42a thereof, and a fixed portion (not shown) of the camera body 11 is fitted in the linear guide groove 42c. Two guide pins 49a and 49b fixed to the are fitted. As a result, the screen size regulation plate 42 is in the range of the effective length of the linear guide groove 42c due to the fitting relationship between the guide pins 49a and 49b and the linear guide groove 42c, and in the direction of arrow A in FIG. Is movably guided. The fitting clearance between the guide pins 49a and 49b and the linear guide groove 42c is strictly set so that the screen size regulating plate 42 does not tilt.

The pair of screen size regulation plates 42, 43 are substantially point-symmetrical with respect to the intersection D of the vertical centerline BB and the horizontal centerline C-C of the photographing aperture 16 shown in FIG. And a rectangular opening corresponding to the photographing opening 16 is formed.

The screen size regulation plate 43 has a linear guide groove 43c along a longitudinal direction in a guide portion 43a thereof, and a fixing portion (not shown) of the camera body 11 is fitted in the linear guide groove 43c. Two guide pins 50a and 50b fixed to the are fitted. As a result, the screen size regulation plate 43 is in the range of the effective length of the linear guide groove 43c due to the fitting relationship between the guide pins 50a and 50b and the linear guide groove 43c, and is in the direction of arrow A in FIG. Is movably guided. The fitting clearance between the guide pins 50a and 50b and the linear guide groove 43c is set strictly so that the screen size regulating plate 43 does not tilt like the screen size regulating plate 42.

The screen size regulation plate 42 has a support pin 51 at the intersection of the guide portion 42a and the screen regulation portion 42b, and the screen size regulation plate 43 has a support pin 55 at the lower end of the guide portion 43a. is doing. A long hole 52a at one end and a long hole 52b at the other end of the interlocking bar 52 are fitted in the support pins 51 and 55, respectively. The communication bar 52 is also configured to be rotatable by a rotation support pin 53 fixed to a fixed portion (not shown) of the camera body 11. Therefore, by moving the screen size regulation plate 42 from the state of FIG. 2 to the upper direction of the figure, the interlocking bar 52 is rotated counterclockwise about the rotation support pin 55, and the screen size regulation plate 42 is rotated. 43 can be moved downward in the figure, and by moving the screen size regulating plate 42 downward in the figure, the interlocking bar 52 is rotated clockwise to move the screen size regulating plate 43. It can be moved upward in the figure.

The screen size switching mechanism 40 can be operated in this state as follows. First, when shooting with a normal 35 mm full screen size, operate the screen size changeover switch 21 that interlocks with the operation unit 42d with a finger to lock the screen size regulation plate 42 into the engagement notch 47a. Move vertically until 45b engages.

Then, the vertical movement of the screen size regulation plate 42 is transmitted as a rotary motion to the interlocking bar 52 via the support pin 51, and the interlocking bar 52 rotates clockwise in FIG. 2 with the pivotal support pin 53 as the center. Rotate. Then, since the turning force of the interlocking bar 52 is transmitted to the screen size regulation plate 43 via the support pin 55 as a vertical straight movement, the screen size regulation plate 43 is a screen size regulation plate with respect to the center line BB. The screen size regulation plate 42 is moved in the opposite direction by the same amount as the movement amount of the screen size regulation plate 42. As a result, the screen size becomes a normal 35 mm full size, as shown in FIG. 2, due to the inner edges of the screen restricting portions 42b and 43b and the left and right ends of the photographing opening 16. Further, the panoramic field of view frame 60 in this case is located at a position retracted from the viewfinder field, as shown in FIG.

When shooting as a panorama size, the screen size changeover switch 21 is operated to move the screen size regulation plate 42 upward from the 35 mm full size, and the engaging claw 45 b is provided in the engaging notch 47 b. Engage. At this time, the interlocking bar 52 is rotated counterclockwise in FIG. 3 about the rotation support pin 53 by the upward movement of the screen size regulation plate 42, whereby the screen size regulation plate 43 is moved to the center line BB. With respect to, with respect to the screen size regulation plate 42, the same amount as the movement amount of the screen size regulation plate 42 is moved in the opposite direction (downward in the figure). As a result, the screen size becomes a panoramic size as shown in FIG. 3 due to the inner edges of the screen restricting portions 42b and 43b and the left and right end portions of the photographing opening 16. On the other hand, the panoramic visual field frame 60 advances into the optical path between the exit surface of the image erecting prism 32 facing the visual field plate 33 and the visual field plate 33 as the screen size regulating plate 43 moves downward, and The light-shielding portions 60b located above and below the opening 60a are located above and below the finder field to make the finder field size a small finder field size corresponding to the panorama size.

In the above embodiment, the panorama screen size switching mechanism provided with the mask member has been described with respect to the screen size switching mechanism 40, but the present invention is not limited to this. The mask member may be provided on one of the pair of light blocking members of the screen size switching mechanism having a different structure from the screen size switching mechanism 40.

In the above embodiment, the small screen size that can be switched by the screen size switching mechanism is a so-called panoramic size of 13 mm × 36 mm, but other sizes, for example, a so-called high-definition size in which the aspect ratio of the film is 9:16. May be

[0022]

[Effect of device]

 As described above, according to the present invention, since at least a part of the screen size switching member and the viewfinder field size switching member is integrated, the switched screen size can be changed with a simple structure that does not increase the number of parts. Accordingly, it is possible to provide a camera having a screen size switching mechanism capable of switching the size of the viewfinder field to a size corresponding to the screen size.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a screen size switching mechanism and a finder optical system, which are features of the present invention.

FIG. 2 is a perspective view showing a screen size switching mechanism in a state of being switched to a large screen size.

FIG. 3 is a perspective view showing the screen size switching mechanism in a state where the screen size is switched to a small screen size.

FIG. 4 is a perspective external view of a camera to which the present invention is applied, as viewed from the back side.

[Explanation of symbols]

10 camera 11 camera body 30 viewfinder optical system 31 objective lens 32 image erecting prism 33 field plate 34 eyepiece 40 screen size switching mechanism 42 screen size control plate (screen size switching member, light shielding member) 60 panoramic field frame (finder field size) Switching member, mask member)

Claims (2)

[Scope of utility model registration request] 1. A camera having a screen size switching mechanism having a screen size switching member for changing a shooting screen size and a finder visual field size switching member for changing a finder visual field according to the shooting screen size, wherein the screen size switching member is provided. A camera having a screen size switching mechanism, characterized in that at least a part of the finder visual field size switching member is integrated. 2. A screen size is switched between a small screen size in which the pair of light blocking members advance and retract into the shooting optical path, and a large screen size in which the pair of light blocking members advances into the shooting optical path. In a camera having a possible screen size switching mechanism, one of a pair of light-shielding members is integrally provided with a mask member to be moved back and forth within the finder field of view of a finder provided in the camera. Screen size switching, characterized in that a light-shielding member provided with a member advances into the viewfinder field as it advances into the shooting optical path, and the viewfinder field is set to a small viewfinder field size corresponding to the small screen size. A camera with a mechanism.