JPS63226630A - Camera - Google Patents

Abstract

PURPOSE:To miniaturize a camera by forming a rear cap to the size at which a cartridge chamber and aperture can be opened and providing film feed members on the position of the aperture. CONSTITUTION:While a rear cover 6 shields only a spool chamber 1b, the rear cap 19 is so formed as to shield the cartridge chamber 1a and the aperture chamber 1c. A spool 8 for winding a film is disposed in the spool chamber 1b and a motor 9 for rotational driving of a fork and the spool 8 via a power transmission mechanism is housed in the spool 8. Rollers 12, 14 to be wound with the film in order to compress the film on the outer peripheral face of the spool 8 are disposed in contact with the outer peripheral face of the spool 8 in the spool chamber 1b. The one roller 12 to be wound with the film is rotatably supported to the front end of a roller supporting plate 10 which is screwed at one end to a camera body 1 and has elasticity. The roller supporting plate 10 is held energized by a spring 11 toward the outer peripheral face of the spool 8.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a camera, and in particular to an easy-to-load film camera that is further improved and miniaturized from the easy-to-load film camera already proposed by the applicant. be.

[Background of the Invention] In cameras using roll film, the film loading operation is generally quite complicated, and therefore, proposals have been made for a simple loading type camera that can easily perform the film loading operation. The present applicant also has the oldest accumulated technology in Japan regarding the technology of simple film loading, and has already made many proposals for the above-mentioned cameras.

In an easy-to-load film camera that the applicant has already proposed, a back cover is provided that allows only the cartridge chamber to be opened, and a film feeding roller is disposed between the cartridge chamber and the aperture chamber. . With this camera,
When loading film, simply insert the cartridge into the cartridge chamber and close the back cover to complete the film loading.Compared to conventional cameras, there is no need for troublesome operations such as locking the leading edge of the film to the film winding spool. It has the advantage of being very easy to use, but because the film feed roller is placed between the cartridge chamber and the aperture chamber, the overall width of the camera is larger than that of conventional cameras.
This also had the disadvantage of making the camera larger.

[Object of the Invention] An object of the present invention is to provide a small-sized film easy-loading camera having the same width as a conventional non-easy-loading camera by eliminating the above-mentioned drawbacks.

[Summary of the Invention] The camera according to the present invention is provided with a back cover that can open the cartridge chamber and the aperture, and a film engagement sprocket that serves as a film feed amount detector and a film feed member is located at the aperture position. Since the camera of the present invention is not provided with a film feeding roller between the cartridge chamber and the aperture chamber, the camera of the present invention is characterized by the fact that it is provided with a film feed roller between the cartridge chamber and the aperture chamber. It is characterized by being smaller and lighter than a camera.

[Embodiments of the Invention] In FIG. 1, 1 is a camera body, 2 is a front cover that shields the front surface of the camera body 1, 6 is a rear cover that shields only a part of the rear surface of the camera body 1, and 19 is a rear cover that shields only a part of the rear surface of the camera body 1. This is a back cover that covers most of the rear surface of the camera body 1. The camera body 1 is formed with a cartridge chamber 1a, a spool chamber 1b, and an aperture chamber IC, and the back cover 19 is rotatably attached to a pivot joint 1d provided on the outer wall of the cartridge chamber 1a around a pin 16. In the camera of the present invention, the rear cover 6 shields only the spool chamber 1b, while the back cover 19
is formed so as to shield the cartridge chamber 1a from the aperture chamber IC, and there is no film feeding roller or the like provided between the cartridge chamber 1a and the aperture IC. This is different from previously proposed cameras.

A protective glass 3 for protecting the photographic lens 4 is attached to a hole in the lens barrel protection section at the center of the front cover 2, and the front plate unit 7 that supports the photographic lens 4 is attached to the camera at a location (not shown). It is supported by the main body 1.

The opening edge of the rear cover 6 is formed as a slope 6a that is oblique with respect to the rear surface of the rear cover 6, while the end surface of the free end of the back cover 19 opposite to the slope 6a is also formed as a slope with the same slope as the slope 6a. 19a, and when the back cover 19 is closed, an air return film passage 18 is formed between the slope 6a and the slope 19a. back cover 1
A light shielding material 17 made of a soft and contractible material is attached to the slope 19a of 9, and after the part F of the film leader exposed outside the camera is drawn into the camera, the light shielding material 17 is removed. The passage 18 is blocked to prevent light from leaking into the camera.

There is a recess on the back side of the slope 6a of the rear cover 6, and a detection switch 5 is arranged in the recess for detecting whether or not there is a film in the film path 18 for empty rewinding and for detecting the leading edge of the film. has been done. One contact piece of the detection switch 5 contacts the film when there is a film in the passage 18 and the switch 5 is turned off, and when the contact piece no longer contacts the film, the switch 5 is turned on.

A spool 8 for winding up the film is arranged in the spool chamber 1b, and a motor 9 for rotating the fork and the spool 8 via a power transmission mechanism shown in FIG. 6 is housed in the spool 8. has been done.

Rollers 12 and 14 for winding the film to bring the film into pressure contact with the outer peripheral surface of the spool 8 are arranged in the spool chamber 1b in contact with the outer peripheral surface of the spool 8. On the other hand, a roller 12 for winding the film is rotatably supported at the tip of an elastic roller support plate 10 whose one end is screwed to the camera body 1. It is energized toward the outer circumferential surface. The other film winding roller 14 is an elastic roller support plate 1 screwed to the inner surface of the rear cover 6 of the camera.
The roller support plate 13 is rotatably supported at the tip of the roller support plate 13, and is pressed against the outer peripheral surface of the spool 8 by the elastic force of the roller support plate 13.

A film fall prevention plate 15 that is rotatable around an axis 15a parallel to the spool 8 is provided at a position near the spool chamber in the aperture chamber IC. A spring 20 is disposed within the aperture chamber 1c, and is always biased towards the aperture chamber 1c. The film fall prevention plate 15 is for preventing the tip of a part of the film leader from falling into the aperture chamber 1c when it passes through the aperture, and the width of the prevention plate 15 is shown in FIG. It is formed with dimensions close to the height of the aperture.

As shown in FIG. 2, a window 1e is opened at the bottom of the groove between the inner rail 22a and the outer rail 23a formed in the camera body 1 along the upper edge of the aperture, and in front of the window 1e. is an axis 21a parallel to the spool 8 as shown in FIG.
A lever 21 that can be rotated about the center is arranged.

The lever 21 is formed with a protrusion 21b that can protrude from the window 1e to the film running path, and the tip 21c of the lever 21 engages with the film fall prevention plate 15 as shown in FIGS. 1 and 2, and the spring 20 It is always urged upward in FIG. 1 by the force of . That is, the protrusion 21b of the lever 21
protrudes between the outer rail 23a and the inner rail 22a through the window 1e, and is capable of engaging with the shoulder F of the film.

On the other hand, a window 1f is opened at the bottom of the groove between the inner rail 22b and the outer rail 23b formed on the camera body 1 along the lower edge of the aperture. Teeth of a sprocket 30, which also serves as a detector, protrude between the rails, and the teeth of the sprocket 30 can be held in perforations on the side edges of the film.

The inner surface of the back cover 19 includes a cartridge pressing spring 26 for holding the cartridge P so that it does not move within the cartridge file, a pressure plate 24 for lightly pressing the film passing through the aperture toward the rail 22a, etc. A spring 29 biasing the pressure plate 24 toward the rail, etc.; a film guide roller 25 provided near the entrance of the film path 18 for unwinding and the contact piece of the detection switch 5;
Various members such as a back cover opening/closing lever 28 having a back cover opening/closing operation knob 27 are attached.

FIG. 4 is a perspective view of the back cover opening/closing lever 28 and related members attached to the inner surface of the back cover 19. Back cover opening/closing lever 2
As shown in the figure, 8 is attached to the back cover 1 by stepped screws 55 and 56 screwed into the screw holes on the inner surface of the back cover 19.
It is installed on 9. The stepped screws 55 and 56 are slidably inserted into the long holes 28b and 28c of the back cover opening/closing lever 28, and the back cover opening/closing lever 28 is inserted into the stepped screws in the longitudinal direction of the long holes 28b and 28c. It can move while being supported by 55 and 56. 57 is a spring that urges the back cover opening/closing lever 28 leftward in FIG. 4, and 58 is a locking pin fixed to the camera body 1.

When the back fi 19 is closed, the hook portion 28a of the back cover opening/closing lever 28 engages with the locking pin 58, as shown in FIG. 4, and the lever 28 is locked onto the locking pin 58. ing. When opening the back cover 19, by manually moving the back cover opening/closing control knob 27 to the right, the hook part 28a and the locking pin 58 are disengaged and the back cover 19 can be opened.

In addition, in FIGS. 2, 3, and 5, 59 is a finder eyepiece, and 60 is a release button.

FIG. 6 shows the sprocket 3o, the spool 8, a power transmission mechanism for driving the fork, a motor 9 that supplies power to the power transmission mechanism, and related members of the sprocket 3o.

In FIG. 6, 8 is the spool, 8a is a spool gear formed integrally with the spool 8, 34 is a spool gear fixed to the shaft of the motor 9, 38 is a sun gear, and 39 is centered around the shaft 40 of the sun gear 38. A planetary lever that can be rotated as
41 is a planetary gear rotatably supported at the tip of the planetary lever 39 and constantly engaged with the sun gear 38; 35 to 37;
42 is a reduction gear in which two large and small gears are integrally molded.
44 is a winding gear train for transmitting power to the spool 8, 46 to 49 is a rewinding gear train for transmitting rotation to the fork gear 50, and 51 is a fork that has entered the cartridge P and is suspended. It is.

The planetary gear 41 is attached to the planetary lever 39 with a predetermined frictional force, and the planetary gear 41 rotates when the load becomes larger than the frictional force. Further, the planetary lever 39 is configured such that it cannot be rotated when the planetary gear 41 meshes with the rewinding gear 46 or the rewinding gear 42.

The gear 43 has a collar 43a on one side thereof, and a notch 43b is formed in the collar 43a. The gear 44 has a shaft inserted into the collar 43a, and a coil spring 45 is fitted onto the shaft, and one end 45a of the coil spring 45 is locked in the notch 43b. Therefore,
The rotation of the gear 43 is transmitted to the coil spring 45 via one end 45a of the coil spring 45, and then transmitted from the coil spring 45 to the gear 44. Therefore, if there is a difference between the rotational speeds of the gear 43 and the gear 44, the spring 45 is returned to its original position, and the difference in rotational speed between the two gears is absorbed as return energy of the spring 45. Therefore, by setting the rotation speed of the spool 8 to be faster than the rotation speed of the film feeding member (sprocket 30), the film can be wound without slack.

A pulley 33 and a disc 53 for rotation detection are attached to the shaft of the sprocket 30, and the pulley 33 is connected to the gear 4.
2 and an endless belt 32 from a pulley 31 fixed integrally with
It is designed to be rotationally driven through. That is,
The sprocket 30 is forcibly driven by the motor 9 only when winding the film.

A conductive pattern 53a for detecting rotation (that is, for generating pulses) is formed on the disc 53.
A detection switch 54 is installed adjacent to the disc 53 and has two contact pieces 54a and 54b that come into contact with the disc 53.

The detection switch 54 is incorporated into the control circuit shown in FIG. 7 as film feed amount detection means, and provides an electrical pulse signal representing the film feed amount to a winding control circuit to be described later.

FIG. 7 is a schematic diagram of a control circuit installed in the camera of the present invention.

In FIG. 7, reference numeral 5 denotes the above-mentioned switch for detecting whether or not there is a film in the film path 18 for empty rewinding, and also for detecting the leading edge of the film, and 19A denotes the back cover 1.
A switch 60A is turned off in response to the closing of the release button 60, a switch 61 is turned off in response to the pressing operation of the release button 60
62 is an exposure control circuit, 62 is a tension detection circuit that detects that the film is in a tension state between the cartridge and the spool when the last frame of the film has been photographed, 63 is a return control circuit, and 64 is a winding circuit. Control circuit, 65 is motor 9
66 and 67 are inverters for inverting the polarity of signals.

Next, the operation for loading a film into the camera of this embodiment having the above configuration and the operation of each part of the camera at that time will be explained with reference to FIGS. 1 to 8.

When loading a film, first open the back cover 19 as shown in Fig. 5, load the cartridge P into the cartridge chamber 1a, and then
Close the back cover 19. At this time, the film leader part F is
As shown in the drawings and FIG. 3, it protrudes to the outside of the camera from a film passage 18 for empty rewinding provided between the rear cover 6 and the back cover 19.

When the back cover 19 is closed, the hook portion 28a engages with the locking pin 58 to lock the back cover, and the fact that the back cover 19 is closed is detected by the back cover switch 19A shown in FIG.
9A will be opened. Then, an "H" level pulse generated by opening the switch 19A is applied to the rewind control circuit 63.

Further, since the two contact pieces of the switch 5 are separated by the film leader part F, the switch 5 is turned off, and the "H" level signal generated in response to the switch 5 being turned off is transmitted to the rewind control circuit 63. By inputting these two signals to the 0 rewind control circuit 63, which is applied to
A control signal is applied from the rewinding control circuit 63 to the motor drive circuit 65 to rotate the motor 9 in reverse (rotation in the film rewinding direction).
A current is applied to the armature in the reverse direction to rotate the motor 9 in the film rewinding direction.

When the motor 9 starts rotating in the film rewinding direction, the sun gear 38 (FIG. 6) is rotated clockwise in FIG. The planetary gear 41 is rotated clockwise, and the planetary gear 41 is meshed with the gear 46. When the planetary gear 41 meshes with the gear 46, the load on the gear 46 is larger than the friction torque between the planetary lever 39 and the planetary gear 41, so the planetary gear 41 starts rotating, and the rotation of the motor 9 is caused by the rotation of the sun gear 38 and the planetary gear. 41 to the gear 46. Therefore, the fork gear 50 is rotated via the gears 46 to 49, and the fork 51 in threaded engagement with the fork gear 50 descends in the axial direction, enters the cartridge, and is connected to the cartridge shaft. The cartridge shaft is also rotated by the rotation of 51. Therefore, as the film is rewound into the cassette, the film present in the film path 18 and the part of the film leader remaining outside the camera are rewound toward the cassette. gear 42
does not mesh with the planetary gear 41, so the power of the motor 9 is not transmitted to the gear 42.

When the back cover 19 is closed as shown in FIG. 1, the teeth of the sprocket 30 fit into the perforation holes in the portion of the film facing the aperture, so the sprocket 30 is in engagement with the film. As the film is wound into the cartridge, the sprocket 30 is rotated according to the amount of film movement, and the disc 53 having the conductor pattern 53a is also rotated. Therefore, the switch 54 is turned on and off, and a pulse signal corresponding to the amount of film rewinding is input to the winding control circuit 64. At this time, the rotation of the sprocket 30 also rotates the pulley 33, so the gears 42 and 43 are rotated via the belt 32.
As a result, the spool 8 is also rotated, but at this time, the film and the spool 8 are in a completely non-contact state, so the spool 8 rotates idly.

When the part F of the film leader exposed outside the camera is pulled into the camera and the tip of the part F of the film leader leaves contact with the contact piece of the switch 5, the contact piece contacts the other contact piece. Switch 5 is turned on and the resulting “L”
The level signal causes the rewind control circuit 63 to be inactive. Further, the signal is applied to the inverter 66, the output level of the inverter 66 becomes "H", and the winding control circuit 64 is activated accordingly. Then, a control signal for rotating the motor 9 in the forward direction is applied from the hoisting control circuit 64 to the motor drive circuit 65, and the motor drive circuit 6
5 supplies a current to the armature of the motor 9 in a direction to rotate the motor 9 in the film winding direction.

Therefore, the motor 9 starts to rotate forward, and the sun gear 38 is rotated counterclockwise in FIG. 6 via the gears 35 to 37.

Therefore, first, the planetary lever 39 is rotated counterclockwise about the shaft 40 so that the planetary gear 41 is disengaged from the gear 46, and then the planetary gear 41 is engaged with the gear 42. Next, the planetary gear 41 is rotated by the sun gear 38, and the gear 42 is also rotated by the gear 41 in a counterclockwise direction in FIG. When the gear 42 rotates, the pulley 31 integrated therewith is also rotated counterclockwise, and the pulley 33 is also rotated counterclockwise via the belt 52. Therefore, the sprocket 30 also rotates counterclockwise in FIG. 6, and as a result, the film is forcibly driven by the sprocket 30 in the winding direction (leftward in FIG. 6). Therefore, the tip of the film leader portion F is fed into the spool chamber 1b and then guided to the outer peripheral surface of the spool 8 along the roller support plate 13.

On the other hand, since the gear 42 is rotated counterclockwise in FIG. 6, the gear 43 is rotated clockwise, and the rotation of the gear 43 is transmitted to the gear 44 via the coil spring 45. As a result, the spool gear 8a is It is rotated counterclockwise in FIG. 6 (clockwise in FIG. 1).

Therefore, the tip of a part of the film leader guided to the outer peripheral surface of the spool 8 enters between the film winding roller 14 and the spool 8, and the film is wound while being pressed against the outer peripheral surface of the spool 8 by the roller 14. It will be done.

On the other hand, since the sprocket 30 is being rotated, the disc 5
3 also rotates, and as a result, the film feed amount in the winding direction is applied to the winding control circuit 64 as an electrical pulse signal of the switch 54. The winding control circuit 64 controls the motor drive circuit 65 so that a predetermined winding amount is obtained by subtracting the winding amount in the winding step from the winding amount in the winding step. Therefore, when the length of the film wound around the spool 8 reaches a predetermined length, the signal applied to the motor drive circuit 65 from the winding control circuit 64 is cut off, and as a result, the motor 9 is stopped. .

When the motor 9 stops, the camera enters a photography standby state.Therefore, when the release button 60 is pressed, the switch 60A in FIG. 7 is turned off, the exposure control circuit 61 is activated, and photography is performed.

After the shooting is completed, a signal indicating the completion of exposure is input from the exposure control circuit 61 to the winding control circuit 64, and in response to this, the winding control circuit 64 applies a signal to the motor drive circuit 65 to perform normal one-frame winding. As a result, the motor 9 is driven in the winding direction to wind one frame of the film.

When all the frames of the film have been exposed in this way and all the film that can be photographed has been taken out from the cartridge, the tension detection circuit 62 returns the film and applies an "H" level control signal to the control circuit 63. In response, the first return # control signal 63 sends a signal to the motor drive circuit 65 to reverse the motor 9. Therefore, a current in the reverse direction is supplied to the motor 9, causing the motor 9 to rotate in the reverse direction, and the film is rewound by the mechanism shown in FIG. 6, as described above. When the film is rewound into the cartridge, leaving only the leading edge of the film, the cartridge can be taken out.

In addition, in the camera of the present invention, the back M19 is the cartridge chamber 1.
Since the film is constructed to be large enough to open not only the aperture chamber 1c but also the aperture chamber 1c, and the sprocket 30 as a film feeding member is installed at the aperture position, the film from the cartridge reaches the film path 18 for empty rewinding. If the length is exposed to such an extent that the winding does not occur, winding is performed without winding after the back cover is closed.

FIG. 8 shows a case where the length of the film protruding from the cartridge does not reach the position of the guide roller 25 when the cartridge is loaded. In this case, part of the film leader F falls into the aperture chamber 1c when the film is advanced toward the spool chamber, but in order to prevent this from occurring, the camera of the present invention has a film fall prevention plate. 15, the leading end of the film is guided to the spool chamber 1b without falling into the aperture 'f51c.

Referring to FIG. 1, FIG. 2, and FIG. 8, the film fall prevention plate 15 when the leading edge of the film passes through the aperture.
The operation of the lever 21 will now be explained.

As shown in FIGS. 2 and 8, when the leading edge of the film is about to pass through the aperture toward the spool chamber 1b, the second
As shown in the figure, one corner Fa of the tip of the film leader does not contact any part of the camera, so due to its own curled shape, it falls into the aperture IC and heads toward the spool chamber. proceed. Therefore, after the corner Fa engages with the film fall prevention plate 15 in the aperture chamber IC near the spool chamber, it overcomes the force of the spring 20 and pushes the film fall prevention plate 15 into the aperture chamber IC. However, the corner Fa itself slides along the surface of the film fall prevention plate 15 and is guided in the direction of the axis 15a of the prevention plate 15 to the same surface as the rails 22a and 22b at the outer edge of the aperture. After a part of the film leader passes through the aperture, when the corner Fb of the wide part of the film engages with the protrusion 21b of the lever 21, the protrusion 21b is pushed down by the corner Fb due to the forward force of the film as shown in FIG. The film drop prevention plate 15 is pushed into the aperture chamber 1c by the force applied from the lever 21. Therefore, since the protrusion 21b is submerged from the film running path, the corner Fb passes through the aperture while sliding along the rail 23a. When the leading edge of the film reaches the spool chamber 1b, the positional relationship between the lever 21 and the film fall prevention plate 15 is the same as that shown in FIG. 1, and the film fall prevention plate 15 is retracted outside the photographing optical path within the aperture IC. are doing.

[Effects of the Invention] As explained above, in the improved camera according to the present invention, a film feeding roller is not provided between the cartridge chamber 1a and the aperture chamber IC, and the back cover is connected between the cartridge chamber and the aperture chamber. The camera is sized to open and close at the same time, and the sprocket serving as the film feeding member is provided at the aperture position, making the overall width of the camera smaller than that of cameras previously proposed by the applicant. be able to. Therefore, according to the present invention, it is possible to provide a camera that is smaller than the cameras already proposed by the present applicant.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a camera to which the present invention is applied, FIG. 2 is a rear view of the camera in FIG. 1 with the back cover removed, and FIG. Figure 4 is a perspective view of the back cover opening/closing mechanism of the camera in Figure 1, and Figure 5 is a perspective view of the back cover of the camera in Figure 1.
Figure 6 is a perspective view of the film feeding mechanism of the camera shown in Figure 1, and Figure 7 is a perspective view of the control circuit installed in the camera shown in Figure 1. Schematic diagram, No. 8
The figure shows the state when the leading edge of the film passes through the aperture in the camera of FIG. 1. l...Camera body 1a...Patrone room l
b-...Spool chamber 1c...Aperture chamber 2-
...Front cover 3...Protective glass 4...Photographing lens 5...Film detection switch 6...Rear cover 7...Front plate unit 8...
- Spool 9...Motor 1 G-...Roller support plate 11...Spring 12...Roller 13...Roller support plate 14...Roller 15 for film winding...・Film fall prevention plate 16...Pressure plate 17...Spring 18...
Film passage for empty rewinding 19... Back cover 20... Spring 21... Lever 22a and 22b... φ inner rail 23a and 23b... Outer rail 24... Pressure plate 25... Guide roller 26... Patrone press spring 27... Back cover opening/closing operation knob 28... Back cover opening/closing lever 29... Light shielding material 30...
・Sprocket 31...Pulley 32...Endless belt 33...Pulley 38...Sun gear
39... Planetary lever 41... Planetary gear
51... Fork 53a... Conductor pattern. Figure 2 et alq Figure 5 Figure 7

Claims (1)

[Scope of Claims] A camera configured such that film loading is completed by simply closing the back cover after inserting the cartridge into the cartridge chamber, wherein the back cover is sized to open the cartridge chamber and the aperture. 1. A camera characterized in that the film transport member is provided at the position of the aperture.