JPH05119382A - Camera - Google Patents

Abstract

PURPOSE:To load film or to rewind film even in a state where a lens barrel collapses by moving a mirror to a retreat position with the collapsing action of the lens barrel and retreating a film pinching member from a film pinching position. CONSTITUTION:This camera is provided with an interlocking control means for moving the mirror to the retreat position from a position on a photographing optical axis with the collapsing action of a lens barrel 1 and retreating a film pressing frame 16 from the film pinching position. Namely, when a mirror holder 3 is up, the rear part of the lens barrel 1 collapses at a position just under the mirror holder 3. At such a time, the frame 16 retreats to a forward position separated from a film 19 by interlocking with the movement of the mirror holder 3. Thus, even though a drop-in loading mechanism is provided in the camera, the film is loaded and the film is rewound even in the state where the lens barrel collapses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera, and more particularly to a camera equipped with a movable reflecting mirror, a film pinching mechanism and a collapsible lens barrel.

[0002]

2. Description of the Related Art Conventionally, a so-called zoom compact camera having a zoom lens barrel has been commercially available as a model of a non-lens exchange type camera. Most of this zoom compact camera has an optical system structure in which a photographing optical system and a finder optical system are separated, and most of them have an active type photometric device. In a camera in which the shooting optical system and the viewfinder optical system are separated from each other, the parallax becomes larger as the shooting magnification becomes larger, and the effect of the parallax becomes so large that it cannot be ignored particularly in macro shooting. .. In addition, since it is difficult to perform accurate photometry on a distant subject with an active type photometry device that projects infrared light toward a subject, this type of photometry device is somewhat suitable for cameras with a large photographing magnification. There was also the problem of being unsuitable.

Therefore, for the reasons described above, a non-interchangeable lens type camera having the same TTL optical system and zoom lens barrel as in a single-lens reflex camera has been developed. In this type of camera, since a movable mirror (reflecting mirror) for guiding a light beam from the photographing optical system to the finder optical system must be arranged behind the photographing optical system, the movement space of the mirror is set in the photographing optical system. It is necessary to install it in the rear,
Therefore, since the lens barrel cannot be retracted into the camera body, the lens barrel portion largely projects forward,
There was a problem that the size of the camera was increased. Therefore, in order to solve this problem, after the movable mirror is retracted from the position on the photographing optical path, at least the rear part of the lens barrel is moved into the position on the photographing optical path where the movable mirror existed until then. A camera configured so that the cylinder can be collapsed has also been proposed (Japanese Utility Model Laid-Open No. 2-58738).

On the other hand, the applicant of the present invention has proposed a device for pressing the film against a film guide rail or the like with a pressure plate when the mirror is raised as a measure for improving the flatness of the film in the aperture part in a single-lens reflex camera. ..

[0005]

It is necessary to equip the above-mentioned TTL type collapsible camera with the above-mentioned device for improving the flatness of the film in the aperture portion in order to make the camera highly functional. However, if it is assumed that the above-described film flatness improving device is mounted on the above-mentioned TTL type collapsible camera, the following problems occur, and it is necessary to solve this.

That is, assuming that the movable frame arranged so as to be pressed against the front surface of the film at the aperture portion is pressed against the film when the mirror is retracted, the mirror retracts when the lens barrel is retracted. The movable frame is pressed against the film pressure plate. Therefore, when the drop-in loading is adopted in which the film cartridge is moved from the lower side of the camera in the direction perpendicular to the photographing optical axis to load the film, there is a disadvantage that the film film cannot be loaded or unloaded during the collapsing, and also when the collapsing is performed. Film rewinding is also impossible.

Therefore, an object of the present invention is to solve the above-mentioned problems and to provide a retractable camera of the TTL type having the above-mentioned film flatness improving device.

[0008]

In the camera according to the present invention, the mirror is moved from the position on the photographing optical axis to the retracted position as the lens barrel is retracted, and the film pressing member is moved from the film pressing position. An interlocking control means for retracting is provided.

[0009]

In the camera according to the present invention, the mirror is moved to the retracted position as the lens barrel is retracted, and the film clamping member is retracted from the film clamping position. Even if the loading mechanism is provided, film loading and film rewinding can be performed even in the retracted state of the lens barrel.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a lens barrel having a half-open type lens shutter 2 therein. 3 is a mirror holder, to which the first total reflection mirror 4 is fixed,
It is rotatable about the shaft 3a and is urged in the counterclockwise direction by a spring 5, but comes into contact with a light-shielding cylinder 6 of the main body so that the mirror 4 moves 45. Held in a tilted position. Reference numeral 7 denotes a lens holder, to which a condenser lens 8 is fixed, is rotatable about a shaft 7a, and is urged clockwise by a spring 9;
Is held at a position parallel to the optical axis of the lens barrel 1. The dowel 3b of the mirror holder 3 is the lens holder 7
Can be contacted with. Reference numeral 10 denotes a second total reflection mirror, which is fixed in parallel with the first total reflection mirror 4. 1
A viewfinder lens group 1 forms a TTL viewfinder optical system together with the lens barrel 1, the first total reflection mirror 4, the condenser lens 8, and the second total reflection mirror 10. A viewfinder shutter 12 is rotatable about an axis 12a and has a gear portion 12b about the axis 12a.
have. When the finder shutter 12 is rotated counterclockwise, it comes into contact with the end portion 13a of the finder base plate 13 that covers the finder lens group 11, the second total reflection mirror 10, and the like. Light entering the finder base plate 13 from the portion 11a is blocked. Reference numeral 14 denotes an interlocking lever, which is rotatable about a shaft 14a and has a spring 15
Is urged clockwise by.

A gear portion 14b is provided at the tip of the interlocking lever 14.
Is formed, and the gear portion 14b and the gear portion 12b of the finder shutter 12 are engaged with each other. 16 is a film pressing frame which is a component of the film pressing mechanism.
It is rotatable about a shaft 3a and is biased clockwise by a spring 17. Reference numeral 18 denotes a film pressing lever, which is rotatable about a shaft 18a, and a tip portion 18b is in contact with the film pressing frame 16, and when the film pressing lever 18 is rotated clockwise, the film pressing frame 16 is rotated. Is rotated counterclockwise against the spring 17 to press the film 19 against the pressure plate 20 fixed to the camera body.
In the conventional camera, the film was passed through a space provided between the rail surface of the camera body and the pressure plate with a slight margin from the thickness of the film. The film 19 is completely pressed against the pressure plate 20. Figure 2
3 is a perspective view showing the shape of a film pressing frame 16 that constitutes a film pressing mechanism together with the pressure plate 20. FIG.

FIG. 3 is a diagram showing a mirror driving mechanism, a film clamping mechanism, and an interlocking mechanism. Reference numeral 21 denotes a drive lever, which can slide up and down, and is biased downward by a spring 22. The hook portion 21a at the upper end of the drive lever 21 is in contact with the dowel 14c of the interlocking lever 14,
Since the spring 22 of the drive lever 21 is set stronger than the spring 15 that biases the lever in the clockwise direction,
Is rotated counterclockwise by the drive lever 21,
The finder shutter 12 rotated by the interlocking lever 14 is held at a position parallel to the finder optical axis. A protrusion 21b is provided in the middle of the drive lever 21, and the protrusion 21b comes into contact with the dowel 3b of the mirror holder 3 when the drive lever 21 slides upward. Further, the projection 21c on the back surface of the drive lever 21 is in contact with the dowel 3c of the mirror holder 3, and the clockwise rotation of the mirror holder 3 is prevented. The dowel 18c of the film pressing lever 18 is pressed against the vertical surface 21d of the drive lever 21 by the force of the spring 17. A gear 22 is engaged with a gear portion 21g of the drive lever 21, and the gear 22 is connected to a motor 23 via a known reduction gear train. Therefore, when the motor 23 is normally rotated, the drive lever 21 moves upward, and when the motor 23 is reversely rotated, the drive lever 21 moves downward. A substrate 24 is fixed to the drive lever 21, and conductive patterns 24a, 24b, 2 are formed on the substrate 24 as shown in FIG.
4c is formed. Contact pieces 25 and 26 fixed to a main body (not shown) are in contact with the substrate 24, and the drive lever 21
Is moved upward, the conductive patterns 24a, 24b, 24
The c is configured so as to electrically connect the contact pieces 25 and 26 in order. In the state of FIG. 3, the contact pieces 25 and 26 are on the conductive pattern 24a and are in conduction.

The above are the components of the present invention. Next, the operation will be described. FIGS. 1 and 3 show a shooting standby state. In a shooting standby state in which a release button (not shown) is pressed to start a shooting operation, the lens shutter 2 is released and is inserted from the front of the lens barrel 1. The subject light is guided to the finder optical system by the first total reflection mirror 4 and enters the eye of the photographer from the eyepiece 11a. The mirror holder 3 is brought into contact with the light-shielding tube 6 of the main body so that the light beam is transmitted to the film
It prevents you from entering 9.

The film retainer 16 is retracted from the film 19 so that the film 19 can be taken in and out, and the film can be wound and unwound.

When the photographing state is entered from the above state, first, a known operation such as photometry and AF is performed, and then the lens shutter 2 is closed to shield the light. Then, the motor 23 is energized and the drive lever 21 is moved upward. Start moving to. When the drive lever 21 starts to move upward, first, the hook portion 21a
However, since it retreats upward, the interlocking lever 14 is rotated clockwise by the spring 15, and the gear portion 14b and the gear portion 12b are rotated.
The finder shutter 12 is rotated counterclockwise by the engagement. The finder shutter 12 is rotated counterclockwise and the end face 13a of the finder base plate 13 is rotated.
It is held at the position where it abuts against the inside of the finder and shields the inside of the finder base plate 13. Next, the intermediate protrusion 21b of the drive lever 21 comes into contact with the dowel 3b of the mirror holder 3, and the mirror holder 3
Is rotated clockwise against the spring 5. Drive lever 2
Before the protrusion 21b of No. 1 contacts the dowel 3b of the mirror holder 3, the protrusion 21c on the back surface of the drive lever 21 is retracted from the moving range of the dowel 3c of the mirror holder 3, so that the mirror holder 3 moves clockwise. When rotated, the first total reflection mirror 4 comes into contact with a stopper (not shown) at a position substantially parallel to the photographing optical axis. While the mirror holder 3 rotates clockwise, the lens holder 7 is moved by the dowel 3b.
Is rotated counterclockwise against the spring 9. Almost at the same time when the mirror holder 3 is rotated clockwise, the drive lever 21 moves the dowel 18c of the film pressing lever 18 to the right by the inclined surface 21e to move the film pressing lever 18 to the right.
Is rotated clockwise, so that the film pressing frame 16 is pressed against the front surface of the film 19 by the front end portion 18b. 4 and 5 show a state in which the drive lever 21 has completed the upward movement. When the drive lever 21 reaches this position, the contact piece 2
5 and 26 contact the conductive pattern 24c of the substrate 24,
The contact pieces 25 and 26 are conductive. This is detected by a control circuit (not shown), the motor 23 is stopped, and this state is maintained. In this state, the mirror holder 3 is completely retracted from the photographing optical path, and when the lens shutter 2 is subsequently opened and closed,
A known exposure is performed. At this time, the film 19 is pressed against the pressure plate 20 by the film retainer 16, so that better film flatness than before can be obtained and the image quality is improved. During exposure, the viewfinder shutter 12 blocks light rays from the viewfinder.

When the exposure by the lens shutter 2 is completed, the motor 23 is energized again in the opposite direction to the previous time, and the drive lever 21 moves downward from the position shown in FIG. With the downward movement of the drive lever 21, a reverse operation to the above-described operation is performed, and the state returns to the states of FIGS. 1 and 3. When the drive lever 21 returns to the initial position in FIG. 3, the contact pieces 25 and 26 come into contact with the conductive pattern 24a of the substrate 24, and the control circuit (not shown) cuts off the power supply to the motor 23. After that, the lens shutter 2 is opened, the film is wound up, and a series of photographing operations is completed. At the time of winding the film, since the film pressing frame 16 has already rotated clockwise and retracted from the film 19 forward, the film is wound with a small winding load without being scratched. be able to.

Next, the operation of retracting the lens barrel 1 will be described. When the main switch (not shown) is turned off in the standby state of FIGS. 1 and 3, first, the lens shutter 2 is closed to shield the light, then the motor 23 is energized, the drive lever 21 moves upward, and FIG. When the state of FIG. 5 is reached, the power supply to the motor 23 is cut off and held. After that, the lens barrel 1 is moved to the position shown in FIG.
6 to the retracted position shown in FIGS. 6 and 7. When the lens barrel 1 is retracted to the predetermined position shown in FIGS. 6 and 7, the lens barrel 1 is held at that position, then the motor 23 is energized again in the opposite direction to the previous time, and the drive lever 21
Starts moving downward from the position shown in FIG. Drive lever 2
When 1 moves downward, the protrusion 21b also moves downward, so that the mirror holder 3 tries to rotate counterclockwise by the spring 5, but the tip of the mirror holder 3 is as shown in FIGS. 6 and 7. The mirror holder 3 is prevented from rotating by coming into contact with the rear end outer peripheral surface 1a of the lens barrel 1.

On the other hand, when the drive lever 21 descends from the position shown in FIG. 5 to the position shown in FIG. 7, the dowel 18 was engaged with the side surface 21f of the protrusion of the drive lever 21 as shown in FIG.
Since c moves to the inclined surface 21e of the lever 21, the film pressing lever 18, which has pressed the film pressing frame 16 against the front surface of the film until then as shown in FIG. 5, rotates counterclockwise from the position shown in FIG. Therefore, the film pressing frame 16 is also rotated clockwise by the spring 17 and retracts forward from the film 19. The film pressing lever 18 rotates counterclockwise and the contact pieces 25 and 26 contact the conductive pattern 24b of the substrate 24 in the vicinity of a position where the dowel 18c contacts the vertical surface of the drive lever 21 and 21d. As a result, the motor 23 is de-energized and the drive lever 21 is stopped.

The state is shown in FIGS. 6 and 7.
At this time, the camera is collapsed to make it compact for carrying.

Further, since the film holding frame 16 is retracted from the film surface, the loading and unloading of the film 19, automatic idling at the time of loading the film, and the film rewinding are all possible.

When the main switch (not shown) is turned on from the above state, the motor 23 is first energized to drive the drive lever 21.
Is moved upward, and when the state shown in FIGS. 4 and 5 is reached, the motor 23 is stopped. Then, the lens barrel 1 is moved to a predetermined photographing position by a known lens barrel driving means, and then the motor 23 is energized again to drive the drive lever 21.
Is moved downward, and when the state of FIGS. 1 and 3 is reached, the motor 23 is de-energized, and then the lens shutter 2 is opened to prepare for photographing.

[0022]

According to the camera of the present invention, the mirror is moved to the retracted position as the lens barrel is retracted, and the film clamping member is retracted from the film clamping position. Even if the drop-in loading mechanism is provided in, the film loading and the film rewinding can be performed even in the lens barrel retracted state.

[Brief description of drawings]

FIG. 1 is a diagram showing a state in which a lens barrel is extended and a mirror is down in a camera according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a film pinching mechanism provided in the camera of the present invention.

FIG. 3 is a diagram showing a mirror driving mechanism, a film clamping mechanism, and an interlocking mechanism of the two, of the camera shown in FIG. 1, showing a state in which a light beam is introduced into a finder optical system without clamping the film. The figure shown.

FIG. 4 is a view showing a state in which a film is clamped in the camera shown in FIG. 1 and a mirror-up operation is possible.

FIG. 5 is a diagram showing a state in which a film is clamped while the mirror is up in the mechanism shown in FIG.

6 is a view showing a state where the lens barrel is retracted in the mechanism shown in FIGS. 1 and 4. FIG.

FIG. 7 is a view showing a state when the mechanism shown in FIGS. 3 and 5 is in a retracted state.

[Explanation of symbols]

1 ... Lens barrel 2 ... Lens shutter 3 ... Mirror holder 4 ... 1st total reflection mirror 5 ... Spring 6 ... Shading cylinder 7 ... Lens holder 8 ... Condenser lens 9 ... Spring 10 ... Second total reflection mirror 11 ... Finder Optical system 12 ... Finder shutter 13 ... Viewfinder base plate 14 ... Interlocking lever 15 ... Spring 16 ... Film pressing frame 17 ... Spring 18 ... Film pressing lever 19 ... Film 20 ... Pressure plate 21 ... Drive lever 22 ... Gear 23 ... Motor 24 ... Substrate 25 ... contact piece 26 ... contact piece

Claims (2)

[Claims] 1. A reflecting mirror which can move between a first position on the photographing optical path and a second position outside the photographing optical path, and an operation of the reflecting mirror moving from the first position to the second position. A film pinching mechanism for pinching the film from the front and rear at the aperture part, and at least the rear part of the lens barrel is configured to be retractable inside the camera body. It has an interlocking control means for moving the reflecting mirror from the first position to the second position along with the operation and for retracting the film clamping member of the film clamping mechanism from the film clamping position. Characteristic camera. 2. The film pinching member comprises a frame body in contact with the front surface of the film and a pressure plate in contact with the back surface of the film, and at least the pressure plate is configured to be movable back and forth with respect to the film surface. The camera of claim 1 characterized.