JPH08122907A - Picture size switching mechanism of camera - Google Patents

Abstract

PURPOSE: To independently change the size in the lateral direction and the longitudinal direction of a picture independently of each other and to change picture size without changing aspect ratio by changing the size of the picture by controlling a first and a second light shielding means. CONSTITUTION: Two engagement arms 11a and 11b are formed on a first light shielding plate 11 and an engagement arm 12a is formed on a second light shielding plate 12. Besides, bosses 22a-22d are formed on a rotating member 22 turned interlocking with a switching knob. When the rotating member 22 is rotated counterclockwise for example, the engagement of the arm 11b and the boss 22a is released. Then, the arm 11b is pressed by the boss 22b and the first plate 11 is moved to a right side. In accordance with this movement, the second plate 12 is moved to the left side by the action of a link lever 13. When the boss 22d is moved to a position where it abuts on the arm 11a, the plates 11 and 12 are arranged at a position where a high-definition photographing format is regulated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen size switching mechanism for a camera used for switching screen sizes such as standard / panorama switching.

[0002]

2. Description of the Related Art A camera capable of switching between standard and panorama has a screen size switching mechanism for changing the exposure range of film. This switching mechanism has an aperture frame provided with a rectangular opening that defines the exposure range of the standard shooting format, and a light shielding plate provided so as to be able to enter the opening along the short side direction of the aperture frame. There is. During standard shooting, the light shield is retracted to the outside of the aperture and the maximum area defined by the aperture frame becomes the exposure range, and during panoramic shooting, the light shield is inserted into the aperture frame by a specified amount and the horizontal The area becomes the exposure range.

[0003]

However, the above-mentioned conventional screen size switching mechanism can only adjust the size of the screen in the short side direction in two steps, and can change the size in the long side direction or the aspect ratio. I couldn't change the screen size without changing it.

[0004]

A screen size switching mechanism of a camera according to the present invention is provided in an optical system for guiding subject light of the camera, and is arranged in a vertical direction and a horizontal direction of a rectangular screen taken in by the optical system. It is characterized in that the size can be switched independently or simultaneously.

More specifically, the screen size switching mechanism of a camera according to the present invention is provided in an optical system for guiding the subject light of the camera, and has a rectangular opening for defining the maximum area of the screen captured by the optical system. A first light-shielding unit that is provided so as to be able to enter the opening and that defines the size of the screen in a first direction that is parallel to one of the two adjacent sides of the opening; The second that defines the size of the screen in the second direction parallel to the other of the two adjacent sides
And a switching means for changing the size of the screen in the first and second directions independently or simultaneously by controlling the first and second light shielding means.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a screen size switching mechanism of a camera according to the present invention will be described below. As shown in FIG. 1, the screen size switching mechanism 10 is applied to a lens shutter type compact camera 1 and is provided in a film guide 2 for guiding a loaded film in the vicinity of an image forming surface of a photographing optical system. It is provided inside (on the side of the taking lens).

The screen size switching mechanism according to the present invention can be provided not only in the photographing optical system but also in the finder system so as to change the finder field screen.

Inside the compact camera 1, a cartridge chamber 3 is formed on one side of the film guide 2 and a spool chamber 4 is formed on the other side, which are covered by a back cover 5. A main switch 6, a shutter button 7, and a display panel 8 are provided on the top surface of the camera 1. A viewfinder window 9 and a shooting format switching knob 21 forming a part of a screen size switching mechanism are arranged on the upper side of the back cover 5.

As shown in FIG. 3, which is a plan view of FIG. 1, FIG. 2, and FIG. 2, the screen size switching mechanism 10 has one of the long side direction (upper side in the drawing) and the short side direction of the rectangular screen. First L-shaped first shading plate 1 that defines one (right side in the figure) boundary
1, a substantially L-shaped second light-shielding plate 12 that defines a boundary between the other side (lower side in the figure) in the long side direction of the screen and the other side (left side in the figure) in the short side direction, and the drive means 20. Have. Drive means 20
Is an aspect ratio and an area of a screen formed inside the first and second light blocking plates by moving the first and second light blocking plates 11 and 12 in conjunction with the short side direction and the long side direction. To change.

In this example, the portion defining the long side direction of the first light shield plate 11 and the portion defining the same long side direction of the second light shield plate 12 are adjacent to each other on the screen captured by the optical system. It functions as a first light shielding unit for defining a width in a first direction parallel to one of the two sides (short side). Similarly, a portion defining the short side direction of the first light shield plate 11 and a portion defining the short side direction of the second light shield plate 12 are the other of the two adjacent sides (long side) of the screen. It functions as a second light shielding means for defining the width in the second direction parallel to the.

In this example, the drive means 20 is a light shield plate 11,
The rotary member 22 is provided on the upper side of FIG. 12 and rotates in conjunction with the switching knob 21. The first light-shielding plate 11 has two engaging arms 11a, 11 protruding upward in the drawing.
b is formed, and the second light shielding plate 12 is also formed with an engagement arm 12a that also projects upward in the drawing.
The rotating member 22 has a plurality of bosses 22a, 22b, 22c, 22d that engage with the engaging arms 11a, 12a, respectively.
Are formed. The bosses 22a and 22c are columnar protrusions provided on the peripheral portion of the rotating member, the boss 22b is a long columnar protrusion longer than this, and the boss 22d is the rotating member 22.
Is a columnar protrusion provided on the arm 22e formed so as to project from the circumference.

The engaging arm 11a of the first shading plate 11 is
The upper end portion is a flat contact surface 11a 'that is pressed by the boss 22d from above in the drawing, and the boss 22a is held from below on the upper end portion of the other engagement arm 11b. An L-shaped holding portion 11b 'is formed so that the boss 22b abuts from the side surface. Second light shield 12
A hook-shaped engaging portion 12a 'is formed at the tip of the engaging arm 12a so as to hook the boss 22c.

It should be noted that the bosses 22b and 22d are the engaging arms 11 of the first light shielding plate 11 arranged on the side closer to the rotating member.
The height is set lower than that of the boss 22c so as not to come into contact with the engaging arms 12a of the second light-shielding plate 12 which is abutted only on a and 11b and overlapped on the a and 11b. There is.

Further, the first and second light shielding plates 11 and 12 are
When the light shield plate is driven by the drive means 20, the light shield plates are linked by two link levers 13 and 14 that interlock with each other and guide them to move in the long side direction and the short side direction.

The first link lever 13 has a rotating pin 13
a is rotatably supported by the camera body, and a long hole 13b that engages with a pin 11c projecting from the first light-shielding plate 11 is formed at one end and the other end is formed at the other end. A long hole 13 that engages with a pin 12b protruding from the second light shield plate 12
c is formed.

The second link lever 14 is rotatably supported by the camera body by a rotation pin 14a, and has a pin 1 which is in contact with the lower side of the first light shielding plate 11 at one end thereof.
4b is provided in a protruding manner, and at the other end, a long hole 14c is formed which engages with a pin 12c provided in a protruding manner on the second light shielding plate.

By the action of these link levers 13 and 14, the first and second light shielding plates 11 and 12 are driven by the drive means 20.
When driven by, the center of the screen formed by these light shielding plates moves symmetrically so as not to move.

Further, a spring 15 is interposed between the first and second light shielding plates 11 and 12 as a biasing means for biasing the two in the direction of approaching with respect to the long side direction of the screen.
The camera body is provided with stoppers 1a and 1b that come into contact with the light shielding plate and prohibit the movement of the light shielding plate in the long side direction when the light shielding plate reaches the closest position in the long side direction. The spring 15 urges the light shielding plates toward each other in the long side direction, but urges both the light shielding plates in the short side direction so as to return to the position defining the standard photographing format shown in FIG.

Next, the operation of the screen switching mechanism of the embodiment will be described with reference to FIGS. In the embodiment, a rectangle A shown by a broken line in the drawing shows a reference screen which is a maximum exposure area defined by an aperture not shown. The reference screen has an aspect ratio of 9:16 in the embodiment and is a shooting format corresponding to the aspect ratio of a so-called high-definition television screen.

First, when switching the above high-definition screen to the standard photographing format of the 35 mm camera shown in FIG. 3, the light shielding plates 11 and 12 are moved in the long side direction so as to shorten the length of the reference screen in the long side direction. Only move them closer to each other. In the state of FIG. 3, the light shielding plates urged by the spring 15 in the direction of approaching each other in the long side direction are positioned by contacting the stoppers 1a and 1b.
In the short side direction, the holding portion 11b 'of the engaging arm 11b abuts the boss 22a on the upper end side, and the engaging portion 12a' of the engaging arm 12a engages on the boss 22c on the lower end side to be positioned.

When the rotating member 22 is rotated clockwise in the drawing with reference to the standard photographing format shown in FIG.
The first shading plate 11 moves in parallel to the lower side in the drawing when the engaging arm 11b is pressed by the boss 22a, and the second shading plate 12 moves in the drawing when the engaging arm 12a is pulled up to the boss 22c. Translate upwards. During this movement, the engaging arms 11b and 12a are locked to the stoppers 1a and 1b.
Since it slides on the screen, the length of the screen does not change in the long side direction.

As a result, the two light-shielding plates are arranged at the positions defining the first panoramic photographing format as shown in FIG. The first panoramic shooting format is
This is a shape in which only the length in the short side direction is shortened without changing the length in the long side direction with respect to the standard photographing format. The rotation angle range of the rotation member 22 from the state of FIG. 3 to the state of FIG. 4 is defined as a first rotation angle range in which the first and second light blocking plates 11 and 12 are moved only in the short side direction.

On the other hand, when the rotating member 22 is rotated counterclockwise in the figure with reference to the standard photographing format shown in FIG. 3, the engagement arm 11b is disengaged from the boss 22a and pressed against the boss 22b. Then, the first light shielding plate 11 gradually moves to the right side in the figure. Further, along with this movement, the second light shielding plate 12 moves to the left side in the figure by the action of the link lever 13.

As shown in FIG. 5, when the boss 22d moves to the position where it abuts on the engaging arm 11a, the light shielding plate is arranged at a position that defines the high-definition photographing format. In this format, positioning is performed by contact between the engagement arm 11b and the boss 22b in the long side direction,
In the short side direction, the upper side is the engagement arm 11a and the boss 22.
The lower side is positioned by the contact with d and the lower side of the second light shielding plate 12 and the pin 1c provided on the camera body.

From the state of the rotating member 22 shown in FIG. 3 to FIG.
The rotation angle range up to the state shown in is defined as the second rotation angle range in which the first and second light shielding plates 11 and 12 are moved only in the long side direction.

When the rotating member 22 is further rotated counterclockwise from the high-definition photographing format shown in FIG. 5, the boss 22d presses the engaging arm 11a downward, and the first light shielding plate 11 moves downward. At the same time, the action of the link lever 14 raises the second light-shielding plate 12, and the second light-shielding plate 12 is arranged at a position that defines the second panoramic photographing format shown in FIG.

From the state shown in FIG. 5 of the rotating member 22 to FIG.
The rotation angle range up to the state shown in is defined as a third rotation angle range in which the first and second light shielding plates 11 and 12 are moved only in the short side direction.

According to the embodiment described above, the first and second light shielding plates 1 that respectively define the boundaries of the screen in two directions.
Compared with the conventional mechanism that changes the size only in the short side direction by linking 1 and 12 with the link lever and moving symmetrically, the short side direction and the long side direction of the screen that does not complicate the configuration The range of can be changed independently.

By changing both the size in the long side direction and the size in the short side direction, the area can be changed without changing the aspect ratio of the screen, and a pseudo zoom effect can be provided.

FIG. 7 is a plan view similar to FIG. 3, showing a modification of the connection between the second link member 14 and the second light shielding plate 12. In this example, a guide groove 12c ′ extending in the horizontal direction is formed in the second light shielding plate 12, and a pin 14c engaging with the guide groove 12c ′ is formed at one end of the second link member 14. Has been done. Also with this configuration, the first and second light shielding plates 11 and 12 can be moved symmetrically in the short side direction.

[0031]

As described above, according to the screen size switching mechanism of the camera of the present invention, not only the screen range in the direction along the short side of the screen but also the long side and the short side without increasing the number of parts. The size in the side direction can be switched independently or simultaneously.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire camera in which a screen size switching mechanism according to the present invention is incorporated.

FIG. 2 is a perspective view when defining a standard shooting format of the screen size switching mechanism according to the embodiment.

FIG. 3 is a plan view of FIG.

FIG. 4 is a first screen size switching mechanism according to the embodiment.
3 is a plan view when defining the panorama shooting format of FIG.

FIG. 5 is a plan view when defining a high-definition shooting format of the screen size switching mechanism according to the embodiment.

FIG. 6 is a second screen size switching mechanism according to the embodiment.
3 is a plan view when defining the panorama shooting format of FIG.

FIG. 7 is a plan view similar to FIG. 3 showing a modified example of the embodiment.

[Explanation of symbols]

 10 Screen Size Switching Mechanism 11 First Light-shielding Plate 12 Second Light-shielding Plate 11a, 11b, 12a Engaging Arm 13, 14 Link Lever 15 Spring 20 Drive Means 21 Switching Knob 22 Rotating Member 22a, 22b, 22c, 22d Boss

Claims (13)

[Claims] 1. A rectangular opening provided in an optical system for guiding subject light of a camera and defining a maximum area of a screen captured by the optical system; A first light-shielding unit that defines the size of the screen in a first direction parallel to one of the two sides of the opening; A second light-shielding unit that defines the size of the screen in two directions, and the size of the screen in the first and second directions can be controlled independently by controlling the first and second light-shielding units, or A screen size switching mechanism for a camera having switching means for simultaneously changing the screen size. 2. The first light shielding means can enter the opening from both sides in the first direction, and the second light shielding means can enter the opening from both sides in the second direction. The screen size switching device for a camera according to claim 1, wherein: 3. The switching means comprises a first format for retracting both the first and second light shielding means out of the opening, and a second format for injecting only the first light shielding means into the opening. A format; a third format in which only the second light-shielding means penetrates into the opening;
2. The screen size switching mechanism for a camera according to claim 1, wherein an arbitrary format can be selected from four formats including a fourth format in which the second light-shielding unit is allowed to enter the opening. 4. The optical system is a photographing optical system of a camera, and the first and second light shielding means are provided in the vicinity of an image plane of the photographing optical system. A screen size switching mechanism for the camera of item 1. 5. The screen of the camera according to claim 1, wherein the screen has a rectangular shape, and the first and second directions are respectively a short side direction and a long side direction of the rectangle. Size switching mechanism. 6. The first and second light shielding means are integrally configured as a substantially L-shaped light shielding plate that defines two adjacent sides of the opening. Screen size switching mechanism of the camera. 7. The first and second light shielding means have a substantially L-shaped first light shielding plate that defines two adjacent sides of the opening, and an approximately L shape that defines the other two sides of the opening. The screen size switching device for a camera according to claim 1, wherein the screen size switching device is configured as a character-shaped second light shielding plate. 8. The size of the screen is changed in the first direction by moving the first and second light shielding plates in an interlocking manner.
The screen size switching mechanism of the camera according to claim 7, further comprising: a driving unit that independently changes the second direction. 9. A rotating member having engaging arms projecting in the same direction formed on each of the first and second light-shielding plates, and the drive means having a boss engaging with the engaging arms. 9. The screen size switching mechanism for a camera according to claim 8, wherein the rotating member is provided on the camera so as to be rotatable by a switching operation. 10. The engaging arm and the rotating member are
In the first rotation angle range of the rotating member, the first and second light shielding plates are moved only in the first direction, and the second rotation angle range different from the first rotation angle range. 10. The screen size switching mechanism for a camera according to claim 9, wherein the first and second light shielding plates are configured to be moved only in the second direction. 11. A biasing means is provided between the engaging arms of the first and second light shielding plates for biasing the first and second light blocking plates toward each other in at least one of the first and second directions. 10. The camera screen size switching mechanism according to claim 9, wherein the camera body is provided with a stopper that defines a closest position of the both light-shielding plates urged by the urging means. . 12. The first and second light shielding plates are connected by a link lever that symmetrically moves the same amount so that the center of the screen formed by the light shielding plates does not move. The screen size switching mechanism of the camera described in 7. 13. A vertical screen and a horizontal size of a rectangular screen captured by the optical system provided in an optical system for guiding subject light of a camera can be switched independently or simultaneously. Camera screen size switching mechanism.