JP3210518B2 - Camera with close-up photography mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera having a close-up photographing mechanism, particularly a camera having a mechanism for extending a lens to a predetermined position for focusing. About.

[0002]

2. Description of the Related Art Conventionally, a photographing lens is extended to a predetermined position by a relatively simple mechanical (mechanical) structure using a cam ring or the like, thereby focusing an object from a short distance to a long distance. There is a camera. According to this, there is an advantage that a good photograph can be taken with an inexpensive camera having a simple configuration.

[0003]

However, in the above-mentioned conventional camera having a relatively simple configuration, there is no camera capable of performing close-up photography in addition to ordinary photography, and thus it is difficult to perform close-up photography easily. was there. That is, the close-up photography is performed in a high-grade camera that electrically drives the extension of the photographing lens and the aperture mechanism. However, in a camera that can perform close-up photography, a configuration in which the extension mechanism and the aperture mechanism of the photography lens are electrically driven is used. Becomes complicated, and the cost is increased because the complicated mechanism is controlled. Therefore,
If good close-up photography becomes possible with a simple configuration and a low-cost camera, a camera having a new concept with high value can be provided.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a camera having a relatively simple configuration and having a close-up photographing mechanism capable of performing close-up photographing at low cost and satisfactorily. Is to do.

[0005]

According to a first aspect of the present invention, there is provided a camera having a close-up photographing mechanism.
A lens arranged to be extended to a close-up shooting position, a close-up shooting setting button for manually operating the close-up shooting setting, and provided for driving the lens along the optical axis according to a shooting distance, A moving member that moves the lens from the close-up shooting position to the close-up shooting position mechanically in conjunction with the operation of the close-up shooting setting button; a regulating lever for restricting the movement area of the blade, at the time of close-up photography, the proximity
Mechanically linked to the operation of the shooting setting button for exposure control
It is located in front of the light receiving section and controls the amount of light incident on this light receiving section.
And a light amount limiting member for limiting the light amount . According to a second aspect of the present invention, the moving member has an optical axis centered.
The cam surface which is arranged in the center and protrudes in the optical axis direction is formed.
It is a three-dimensional cam ring formed .

[0006]

According to the above configuration, when the close-up shooting setting button is manually operated, for example, a cam ring as a moving member is rotated in a predetermined direction, and the lens is moved from the close-up shooting position to the close-up shooting position. It is paid out. At the same time, the regulating lever moves in conjunction with the rotation of the cam ring, for example, by restricting the open state of the shutter blades, thereby regulating the shutter aperture opening to be small (the aperture value is large). According to this, the lens in a state where the depth of focus have your proximity region is ensured, will be the focal point is matched to the near distance area for example 1.2m or less, it is possible to better close-up photography.

[0007] At this time, the light amount restriction member by the operation of the close-up setting button is placed in front of the light receiving portion, underexposure caused by having a small aperture in the above Ru is corrected. In other words, when the shutter aperture is reduced due to the restriction of the light-shielding blades, the amount of light becomes insufficient compared to the case other than close-up shooting.
Insufficient light quantity can be eliminated. In a camera employing low-luminance strobe automatic light emission control, the incidence of light on the light receiving unit may be completely shut off. In this case, shortage of exposure is eliminated by the emission of the strobe light, and exposure control similar to flashmatic control can be performed.

[0008]

FIG. 1 shows a configuration of a camera having a close-up photographing mechanism according to an embodiment, and FIG. 2 shows an operation state of the embodiment mechanism during close-up photographing. In FIG. 1, a three-dimensional cam 11 is formed on the front side of a cam ring (moving member) 10 for moving a lens to a predetermined position, and a cam ring 1 having the three-dimensional cam 11 is provided.
By rotating 0, the taking lens 12 is extended to a predetermined position. In the case of the embodiment, the lens 12 can be set to a long-distance shooting position by turning clockwise in the drawing, and the lens 12 can be set to a short-distance shooting position by turning counterclockwise. The cam ring 10 is urged clockwise by a charging spring 13.

An engaging pin 15 is attached to the upper projecting portion 14 of the cam ring 10 so as to project rearward. The engaging pin 15 is engaged with a projecting piece 17 of a driving body 16. I have. That is, the driving body 16 is moved from the right side to the left side in the drawing by the rotation of a set cam connected to a film winding shaft (not shown).
Is moved to the left at the time of film feeding, the cam ring 10 is rotated counterclockwise by the projecting piece 17,
It is set to the standby position on the short distance side. At this time, the lens 12 has been extended to the short-distance photographing position, and at the time of photographing, the lens 12 can be extended to the photographing position at an arbitrary distance by returning the cam ring 10 to a predetermined position by the spring 13.

The cam ring 10 and the lens 1
Reference numeral 2 is configured to move closer to the near side than the conventional close-up shooting position. That is, the state shown in FIG. 1 is a state in which the cam ring 10 is set at the near (distance) standby position. From this position, the cam ring 10 moves counterclockwise until it comes into contact with a stopper 18 for further positioning to the close-up photographing position. The cam ring 10 rotates, and the lens 12 is also extended to the close-up photographing position in accordance with the rotation of the cam ring 10.

Further, the engagement pin 15 of the cam ring 10
Is engaged with a projection 21 of a regulating lever 20, and the regulating lever 20 is disposed so as to be movable in the left-right direction. A locking pin 2 is provided below one end of the regulating lever 20.
2 is attached. On the other hand, behind the cam ring 10, two shutter blades (light-shielding blades) 23A and 23B (which may be one) that swing about a common fulcrum are provided, and this shutter blade 23B is provided. By contacting the locking pin 22, the shutter blade 2
The opening amounts of the apertures 3A and 23B, that is, the aperture openings are limited.

That is, FIG. 1 shows the shutter blades 23A and 23B opened, but in the state of FIG. 1, the shutter blades 23A and 23B are opened to the maximum and the apertures are also opened.
Then, by moving the regulating lever 20 (the locking pin 22) to the left, the opening of the shutter blades 23A and 23B is regulated to be small as shown in FIG. For example,
Assuming that the aperture value is set to F5.6 in close-up shooting, for example, the aperture value F11 (F5.6 →
F8 → F11) so that the shutter blades 23A, 23A
The opening of 3B is controlled.

The setting of such close-up photographing is performed by manual operation of a close-up photographing (setting) button 25 arranged on the outer surface of the camera. That is, as shown in the drawing, the close-up shooting button 25 has a return spring 26, and has a structure capable of maintaining the position when slid to the right set position against the return spring 26. Also,
The close-up shooting button 25 is connected to a drive lever 28 via a spring-like mounting member 27 that absorbs overstroke. One end of a driving body 30 that can be moved in the horizontal direction is connected to the driving lever 28 by a pin 29,
When the driving body 30 is moved by the driving lever 28, as shown in FIG. 2, the other end of the driving body 30 comes into contact with the projection 14 of the cam ring 10 to rotate the cam ring 10 to the close-up photographing position in the counterclockwise direction. Are arranged as follows.

Further, in the camera of the embodiment, the automatic exposure control is performed by detecting the brightness of the object, but in the present invention, the light measurement amount in this exposure control is corrected in accordance with the conversion of the aperture value. ing. That is, a light receiving portion 32 including a lens and an optical sensor is attached to a predetermined position of the camera, and a vertically movable movable stop member (light amount limiting member) 33 is provided so as to protrude forward from the light receiving portion 32 from below. Be placed. A guide groove 34 formed in an oblique direction is provided at the center of the aperture member 33, and a rod-shaped pin 29 connecting the drive lever 28 and the drive body 30 is fitted into the guide groove 34. According to this, as shown in FIG. 2, the upper part of the aperture member 33 covers the front side of the light receiving unit 32 in conjunction with the operation of the close-up shooting button 25.

An aperture 35 for reducing the amount of incident light is formed above the aperture member 33. In the embodiment, as described above, the aperture value is set to F5.
Since the size is increased from 6 to F11, this results in a shortage of light quantity for photographing. Accordingly, the incident light amount for photometry is reduced in response to the insufficient light amount of the aperture value in these two stages, and the opening operation time of the shutter blades 23A and 23B is increased by automatic exposure control, so that an optimum optimal result is obtained. Light exposure is to be achieved.

The embodiment has the above configuration, and the overall operation will be described with reference to FIG. First, the close-up shooting button 25
Is manually slid to the right, the drive lever 28
Swings counterclockwise to drive the driver 30 to the left. Then, the cam ring 10 is rotated in the counterclockwise direction because the left end of the driving body 30 presses the protrusion 14, and when the close-up shooting button 25 is locked at the set position, the cam ring 10
Abuts on the stopper 18 and stops at the close-up photographing position. At this time, the spring-like mounting member 27 absorbs the overstroke of the close-up photographing button 25, so that the cam ring 10 can be accurately arranged at the contact position of the stopper 18. When the cam ring 10 rotates in this manner, the lens 12 is set at the close-up photographing position by the three-dimensional cam 11.

At the same time, when the cam ring 10 rotates, the engaging pin 15 of the cam ring 10 moves the regulating lever 20 to the left by a predetermined amount, whereby the opening amount of the shutter blades 23A and 23B is regulated. . As described above, in the embodiment, the shutter aperture is controlled to be small so that the aperture value becomes from F5.6 to F11.

By operating the close-up photographing button 25,
When the drive lever 28 swings counterclockwise, the pin 29 slides in the guide groove 34 of the throttle member 33, so that the throttle member 33 moves upward. Then, this aperture member 3
The upper end of 3 protrudes forward of the light receiving unit 32 to block the incident optical path, and the light narrowed by the aperture 35 enters the light receiving unit 32. In the embodiment, the aperture value is F5.6.
In response to the change in the light amount when the light amount is regulated from F11 to F11, the change in the photometry corresponding to the change is narrowed down. Therefore, in the exposure control, the necessary exposure amount is secured by setting the operation time of the shutter blades 23A and 23B to be long.

In this manner, the close-up photographing can be performed by operating the close-up photographing button 25. In the embodiment, as shown in FIG. If shooting is possible up to
Close-up photography from 1.2 m to 0.6 m is possible. The rotation of the cam ring 10 and the extension of the lens 12, the restriction of the aperture by the restriction lever 20, and the restriction of the amount of light received by the light receiving unit 32, which are performed based on the operation of the close-up shooting button 25, are performed by a simple mechanical configuration. Therefore, a camera having a close-up photographing mechanism can be manufactured at low cost.

In the above-described embodiment, the aperture member 33 is provided with the opening 35 having a predetermined size so as to reduce the amount of light incident on the light receiving section 32 by a predetermined amount. In this case, the aperture member 33 is not provided with the opening 35 and is completely shielded from light (when the incident light amount is 0).
State). In this case, the control unit determines that the subject is dark and always emits the strobe light, so that photographing with the strobe light becomes possible. According to this, the aperture value can be set according to the close distance in relation to the guide number of the strobe, and the same exposure control as that of the flashmatic is executed.

The diaphragm member 33 is formed integrally with the regulating lever 20 so that the diaphragm member projects forward of the light receiving portion 32 when the regulating lever 20 moves to the left. Is also good. In this case, the cam ring 10 may be electrically rotated by operating the close-up shooting button 25.

Further, in the above-described embodiment, the example in which the aperture member 33 is used as the light amount limiting member has been described, but the light amount limiting member may be an opaque film or a plastic that limits the light incident on the light receiving section 32 by a predetermined amount. Or a filter or the like.

Also, an example in which the cam ring 10 having the three-dimensional cam 11 is used as the moving member has been described. As the moving member, for example, a flat plate that moves linearly is provided, and the lens 12 is moved in the optical axis direction by the linear movement. A three-dimensional cam (linear cam) for moving to the lens portion or the flat plate may be provided. According to this, by driving the flat plate by the close-up shooting button 25, the lens 1
2 can be moved in the optical axis direction.

[0024]

As described above, according to the present invention,
A moving member such as a cam ring is used to move the photographing lens to a close-up photographing position, and the moving member is mechanically moved by operating a close-up photographing setting button to move the lens from a close-up photographing position to a close-up photographing position. In addition to the movement, in conjunction with this moving member, the restriction lever is regulated so as to reduce the shutter aperture opening, so a relatively simple camera mainly using a mechanical configuration,
There is an advantage that close-up shooting can be performed by button operation, and a camera capable of performing such close-up shooting can be provided at low cost.

At the time of close-up photography, a light quantity limiting member is disposed in front of the light receiving section for exposure control based on an operation of the close-up photography setting button, and the light quantity limiting member controls the amount of light incident on the light receiving section. Since the quantitative limitation is performed, insufficient exposure due to the reduced shutter aperture in the above can be corrected, and good close-up photography can be performed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a camera provided with a close-up photographing mechanism according to an embodiment of the present invention (showing a state where shutter blades are open).

FIG. 2 is an exploded perspective view showing an operation state during close-up shooting in the configuration of the embodiment.

FIG. 3 is an explanatory diagram illustrating a range of close-up imaging according to the embodiment.

[Explanation of symbols]

 Reference Signs List 10 cam ring, 12 lens, 15 engagement pin, 16, 30 driver, 18 stopper, 20 control lever, 22 locking pin, 23A, 23B shutter blade, 25 close-up photography (setting) Button, 28 drive lever, 32 light receiving section, 33 stop member, 35 opening hole.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yasuhiko Tanaka 1-324 Uetakecho, Omiya City, Saitama Prefecture Inside Fuji Photo Optical Co., Ltd. (72) Inventor Junichi Matsumoto 2-16-20 Shimura, Itabashi-ku, Tokyo In Copal Co., Ltd. (56) References JP-A 61-88124 (JP, U) JP-A 60-21726 (JP, U) JP-A 3-40347 (JP, U) (58) Fields surveyed (Int) .Cl. ⁷ , DB name) G03B ^7/ 00-7/28 G02B ⁷ /02-7/105

Claims (2)

(57) [Claims] A lens disposed so as to be extended to a close-up photographing position; a close-up photograph setting button for manually operating close-up photographing settings; and a lens for driving the lens along an optical axis according to a photographing distance. A moving member that mechanically interlocks with the operation of the close-up shooting setting button to move the lens from a close-up shooting position to a close-up shooting position; A regulating lever for regulating the movement area of the light-shielding blades of the shutter section, and mechanically operating the close-up photographing setting button during close-up photographing.
It is placed in front of the light receiver for exposure control in
And a light amount limiting member for limiting the amount of light incident on the light receiving unit . 2. The moving member is arranged around an optical axis.
And a cam surface protruding in the direction of the optical axis.
The camera according to claim 1, wherein the camera is a cam ring .