JPH02178643A - camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a camera that can change the size of the photographic screen, and particularly relates to improvements in this type of camera when the optical system moves, such as when collapsing the barrel. It is.

[Conventional technology]

In general, a camera that uses a 35 mm wide roll film to take pictures with one screen size of 24 mm x 35 mm is called a 35 mm camera or a full-size camera, and a camera that uses the same roll film 2
It is well known that a camera that takes pictures with dimensions of 4 mm x 7 and 5 mm is called a half-size camera. Traditionally, full-size cameras and half-size cameras existed as completely different cameras, so if a camera user wanted to take both full-size and half-size photos, he or she would carry two cameras. I needed to.

Therefore, in order to solve this inconvenience, a camera having a function of switching the shooting screen size has been proposed.

On the other hand, as a recent trend in the field of compact cameras, there has been an increase in multifocal and zoom lenses, which has resulted in thicker lens barrels, resulting in a decline in portability and storage.

To avoid this, it is useful to use a so-called collapsible camera, in which the lens barrel and the like are stored in the main body when not photographing.

However, there has been no conventional camera equipped with these two functions. This is due to the following circumstances.

In other words, in a camera that can switch between full-size and half-size, the shielding plate that shields the aperture from half-size must be retracted during full-size photography, which gets in the way and makes it difficult to store the photographic optical system compactly. could not.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and includes a screen size variable means for changing the photographing screen size, an optical system moving means for moving the photographing optical system, and an optical system using the optical system moving means. and responsive means for displacing the screen size variable means in response to the movement of the optical system moving means so as not to disturb the movement of the optical system moving means, so that the camera can be made larger even when the optical system moving function is provided. To provide a camera capable of changing the screen size, in which the screen size variable means can be prevented from interfering with the movement of the optical system without causing any problems, and the screen size variable means can also improve light shielding and dustproof properties. It is.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 to 3 show the configuration of a first embodiment of the camera according to the present invention. Figure 1 shows the camera in full-frame shooting mode, and Figure 2 shows it in half-frame shooting mode. It shows.

In FIGS. 1 and 2, 1 is a camera body, and a lens barrel 2 as an optical system moving means is provided on the front surface of the camera body 1, and a photographing optical system is provided inside the lens barrel 2. A photographic lens 3 is attached. Further, inside the camera body l, there are aperture opening forming members 100a and 100b for forming an aperture opening, and on the front side, an aperture opening formed by the aperture opening forming members 100a and 100b is used for full size photography and half size. A pair of aperture shielding plates 8 and 12 are provided as means for changing the screen size for size photography.

The aperture shielding plates 8 and 12, as shown in an exploded perspective view in FIG. 3, are swingably supported around vertical pins 7 and 10 provided on the camera body l.

The aperture shielding plates 8 and 12 have the function of setting the shooting screen to either full-size shooting (24 x 35 mm) or half-size shooting (24 x 17.5 mm), and in the state shown in Fig. 1, the shooting screen is The size of the shooting screen is set for full-size shooting, and in the state shown in FIG. 2, the size of the shooting screen is set for half-size shooting.

Reference numeral 6 denotes a first rotary portion which is rotatably supported around the aforementioned pink plate, and has a pin 6a for regulating the rotation angle of the aperture shielding plate 8. The aperture shielding plate 8 is biased by a spring 13 in the counterclockwise opening direction in the figure and comes into contact with the bottle 6a. A gear 6 is provided on the upper surface of the first rotating part 6.
b is provided, and this gear is the gear 4 of the rotary lever 4.
It meshes with a.

The rotation lever 4 is a vertical bottle 5 provided on the camera body l.
The first
It also operates in conjunction with a second rotating section ll that is paired with the rotating section 6.

The second rotating section 11, like the first rotating section 6, has a bin lla for regulating the rotation angle of the aperture shielding plate 12, and has an aperture rotatably supported by a vertical bin IO. The shielding plate 12 is biased in the clockwise opening direction by the biasing force of the spring 14, and is in contact with the bottle lO.

The lens barrel 2 has a collapsible function and can be slid back and forth along the optical axis direction of the photographic lens 3 by operating a collapsible lever 2a. Also, 1o1 is the patrone room, 1
02 is film cartridge, lo3 is spool room, 10
4 is a film winding shaft.

Next, the operation of the above configuration will be explained.

i) Full-size and half-size switchable camera with lens barrel 2
When switching from the full-frame shooting mode shown in Figure 1 to the half-frame shooting mode shown in Figure 2 with the camera extended, first, the camera should not be set for full-frame shooting as shown in Figure 1. 2 is extended, the aperture shielding plate 8.12 is biased by the spring 13.14 as shown by the solid line and comes into contact with the rotation angle regulating bins 6a and lla, and does not shield the aperture for full-size photography. rotating into position.

Next, to switch the camera to half-size photography, one end 4b of the rotary lever 4 is operated to the right. Then, the rotary lever 4 rotates counterclockwise around the shaft 5, and the first rotating part 6 rotates clockwise around the shaft 7 due to the gear 6b meshing with the gear 4a of the rotary lever 4. move. As a result, the aperture shielding plate 8 is pushed by the regulating pin 6a of the first rotating section 6 and rotates clockwise, that is, in a direction that covers the aperture.

On the other hand, the counterclockwise rotation of the rotary lever 4 is transmitted to the second rotating part 11 through the transmission band 9, and the second rotating part 1
1 also rotates counterclockwise around pin IO. As a result, the aperture shielding plate 12 also has the regulating pin lla of the rotating part 11.
is pushed and rotated counterclockwise, that is, in a direction to cover the aperture. As a result of the above operations, the aperture shielding plates 8 and 12
largely shields both side edges of the aperture opening, and the opening size of the aperture is shielded to a size for half-size photography in FIG. 2, which is smaller than that for full-size photography in FIG. 1.

On the other hand, when switching the camera from the half-size photographing state shown in FIG. 2 to the full-size photographing state shown in FIG. 1, one end 4b of the rotary lever 4 is operated to the left from the position shown in FIG. Then, each member within the camera performs an operation completely opposite to that described above, and as a result, as shown in FIG. The dimensions are suitable for full size photography.

it) Retracting and retracting the lens barrel Retracting the lens barrel 2 in the full-frame shooting state shown in Figure 1 (retracting)
In this case, by operating the collapsing lever 2a in the direction of the arrow, the collapsing operation is performed to move the lens barrel 2 from the position indicated by the solid line to the position indicated by the two-dot chain line. As the lens barrel 2 is retracted, the shielding plates 8 and 12 are pressed by the pin 2b as a response means protruding from the lens barrel 2 from the position indicated by the solid line, and the spring 13. It rotates against the biasing force of 14 and moves toward the aforementioned half-size photographing position indicated by the chain double-dashed line that shields the aperture.

As a result, even if the aperture shielding plates 8 and 12 are within the movement path of the lens barrel 2, the aperture shielding plates 8 and 12 do not interfere with the collapsing operation of the lens barrel 2, and the camera can switch between full size and half size. However, the lens barrel can be collapsed without increasing the size of the camera. That is -
1. When the lens barrel is retracted, no photography is performed, so there is no problem even if the aperture shielding plate 8.12 rotates to change the aperture opening size.Also, when the lens barrel is extended, there is no problem when the lens barrel is moved to retract. Since the path becomes an open space, by using this movement path to switch between full size and half size of the aperture shielding plates 8 and 12, the space required for the camera can be saved and the camera can be made smaller.

When the lens barrel 2 is moved from the position indicated by the two-dot chain line in FIG. 1 to the position indicated by the solid line again by operating the lever 2a, the aperture shielding plate 8,
Reference numeral 12 indicates a regulating pin 6a that follows the movement of the lens barrel 2 by the biasing force of springs 13 and 14, and is provided protruding from the rotating parts 6 and 11;
The aperture is rotated in a direction that does not block the aperture until it comes into contact with lla, and a state is reached where full-size photography is possible.

When retracting (retracting) the lens barrel 2 in the half-size photographing state shown in FIG. 2, the lens barrel 2 is extended and retracted by operating the collapsing lever 2a, as in the case of the full-size photographing state described above.

On the other hand, in the half-size photographing state, the aperture shielding plates 8 and 12 have second rotation angle regulating pins 6a and lla that shield the aperture for half-size photographing, as described above.
The aperture shielding plate 8.12 is rotated to the state shown in the figure, and this position is further rotated from the movement path of the lens barrel 2. Therefore, the aperture shielding plate 8.12 is not connected to the movement of the lens barrel 2 (always It is retracted and stopped at a position where it does not interfere with the movement of the lens barrel 2.

Therefore, even in the state of half-size shooting, the aperture shielding plate 8
, 12 do not interfere with the drawing-in operation of the lens barrel 2.

In addition to the configuration of the above embodiment, the driving force for collapsing the barrel and changing the shooting screen size may be manually operated, or a motor or coil equipped with a switch may be used. In addition to a transmission band, a link mechanism, a gear, or the like may be used as a means for transmitting the power and rotating the rotating part. Further, the mechanism for changing the aperture shielding plate is not limited to the rotary method of the above embodiment, but may be a structure that changes according to the collapsing operation (for example, a sliding type or a combination of a rotating type and a sliding type). In addition, the movement can be transmitted by simply pressing with a pin (
A link mechanism or the like may also be used.

4th rI! Reference numeral J shows an example of such a structure, in which the collapsing operation is driven by a motor, and the aperture shielding plate is changed by a combination of a rotating type and a sliding type. Furthermore, in this embodiment, in order to further improve the light shielding and dustproof effects, the aperture opening is completely covered by the aperture shielding plate when the barrel is collapsed.

The structure of each part for collapsing the barrel in the embodiment shown in FIG. 4 will be described. It should be noted that the same components as those in the above-mentioned embodiment are given the same reference numerals.

First, when a collapsible switch (not shown) is turned on, the motor 20
3 rotates. The rotational motion is transmitted through a gear group 204 and drives a rack 205 installed on the side of the lens barrel 2. This causes the lens barrel 2 to collapse. That is, lens barrel 2
performs the collapsing operation by moving from A-+B to C as shown in the figure. There is a stepped surface 2C on the aperture side of the lens barrel 2, and a slide rail 8 is attached to the aperture shielding plate 12 on the surface 2C.
Auxiliary shielding plate 20 installed via a, 200b
The tip portion 201 of the vertically bent portion 200a of No. 0 is in contact with it. Note that the auxiliary shielding plate 200 is biased by a spring 202 in the direction of opening the aperture. Further, the tip 201 of the vertically bent portion 200a of the auxiliary shielding plate 200 has a small coefficient of friction with the surface 2C, or is a member that can reduce friction by rotating like a caster. .

In the above configuration, as the lens barrel moves to A-4B, the surface 2c pushes the vertically bent portion 200a, thereby rotating the entire aperture shielding plate 8 until it comes into contact with the aperture opening. Further, as the lens barrel moves to B- and C, the holding shield plate 200 moves in a direction to cover the aperture along the slide rail 8a. Note that this configuration is provided on both sides symmetrically with respect to the center of the aperture, and the aperture opening is completely covered by movement of the auxiliary shielding plate 200 as the barrel collapses.

Next, FIG. 5 shows a modification of FIG. 4. In this case, the rotation of the aperture shielding plate 8 and the sliding of the auxiliary shielding plate 200, which were performed by the surface 2C and the vertically bent portion 200a in the embodiment shown in FIG. 4, are performed by the link rod 306. Note that the same components as in FIG. 4 are given the same reference numerals. The bottle 2b of the lens barrel 2 pushes against a frame member 308 that is elastically supported by a structural member via a spring. The frame member 308 is the link rod 30
8 are connected by a rotatable hinge 307, and the other end of the link rod 306 is connected to the auxiliary shielding plate 200 by a rotatable hinge 305. Here, it is assumed that each member is initially in the state shown by the two-dot chain line. After the lens barrel approaches the aperture opening side and hits the frame member 308 at position D, the frame member 308 is pushed toward the aperture side, and the aperture shielding plate 8 rotates due to this movement to cover the aperture opening. After the aperture shielding plate contacts the aperture opening, the auxiliary shielding plate 200 further slides in the direction of covering the aperture opening, and when the frame member 308 reaches position E, the light shielding member 200 completely covers the aperture opening. It gets hot (solid line).

In addition, in the embodiment shown in FIGS. 4 and 5, the movement of each part in the full-size photographing state has been explained, but in the half-size photographing state, the regulation bin 6a is at the position indicated by the two-dot chain line, and the aperture shielding plate is closed to the aperture opening. Since the lens barrel 2 moves halfway and only the auxiliary light shielding plate 200 does not cover the aperture opening, the auxiliary shielding plate 200 opens and closes following the movement of the lens barrel 2.

In the above embodiments, the movement of the lens barrel is collapsing, but it goes without saying that the present invention is also applicable to other movements of the optical system, such as focus switching, and even to other moving members.

Further, in the above-described embodiments, the optical system is a photographing lens, but it goes without saying that the present invention can also be applied to an optical system such as a finder.

Furthermore, in the above-described embodiment, the photographic screen size is switched between full size and half size, but it goes without saying that the present invention is applicable even when the screen size is switched to other screen sizes.

〔Effect of the invention〕

As explained above, according to the present invention, even when a camera capable of changing the screen size is provided with a function of moving the optical system, the camera can be made compact without the screen size changing means interfering with the movement of the optical system. In addition to improving portability and storability, the screen size variable means allows the aperture to be thickened (shielded) to provide light shielding and dustproof effects.

[Brief explanation of the drawing]

1 is a front view and a plan view of a camera according to an embodiment of the present invention in a full-size photographing state; FIG. 2 is a front view and a plan view of the camera of FIG. 1 in a half-size photographing state; 3 is a perspective view showing the aperture shielding plate and its assembled state in the camera shown in FIGS. 1 and 2, FIG. 4 is a partial plan view showing a modification of the embodiment shown in FIG. 1, and FIG. 5 is a further FIG. 2 is a plan view showing a further modification of the embodiment of FIG. 1; 2... Lens barrel, 3... Lens, 4... Rotating lever,
6... First rotating part, 9... Transmission band, 11... Second
Rotating part, 8, 12...Aperture shielding plate, 13.14
...Spring, 100a, 1oOb...Aperture opening forming member, 200...Auxiliary shielding plate No. 70 Fig. 5

Claims (1)

[Claims] a screen size variable means for changing the photographic screen size; an optical system moving means for moving the optical system; A camera capable of changing screen dimensions, characterized in that it is equipped with a response means for displacing the screen so as not to interfere with the movement of the camera.