JPS5852570B2 - camera - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multiple exposure device in a camera having a photosensitive material feeding device in which an internal mechanism related to exposure is charged in conjunction with feeding of the photosensitive material.

Although various proposals have been made regarding multiple exposure functions for general cameras, none have been proposed using sheet-like photosensitive materials.

Further, when a sheet-like photosensitive material is fed by a roller, a means is required to force the sheet-like photosensitive material onto the roller, and then the roller feeds the sheet-like photosensitive material.

An object of the present invention is to provide a camera that enables multiple exposure by improving the means for feeding the sheet-like photosensitive material onto the roller.That is, even if the feeding roller is driven,
To provide a camera in which the film is not caught on a roller, only the shutter is charged, the feeding of the sensitive material is not carried out, and multiple exposure is possible.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a photosensitive material feeding device used in a camera according to the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the entire photosensitive material feeding device used in a camera according to the present invention, and shows a state in which charging (feeding) is completed.

1 is a manual winding lever, and 2 is a winding knob.

3 is a gear, 4 is a ratchet wheel constituting a known one-way clutch, and 5 is a rotatable shaft that integrates the winding lever 1, the gear 3, and the ratchet wheel 4.

6, 7, 8, and 9 are gears, and the gears 6 and 7 and the gears 8 and 9 are integrated.

Reference numeral 10 denotes a shaft that is integrated with the gears 8 and 9, and a plate 11 that easily receives air resistance is fixed to one end.

The rotation of the winding lever 10 is transmitted to the plate 11 via the gear trains 3, 6, 7, and 8, but the reason is that the gear train is a speed increasing gear train and that the plate 11 is disposed. Due to this, the winding lever is configured to rotate 10 times at a substantially constant speed.

12 is a ratchet support, 13 is a roller, 14 is a spring arranged to push the roller 13, and the ratchet wheel 4, 12, the roller 13,
The spring 14 forms a known one-way clutch section 100.

15 is a gear, 16 is a one-way clutch portion that plays the same role as the clutch portion 100 described above, and the portion visible in the figure corresponds to the ratchet support of 12.

17 is a gear, and 18 is a rotatable shaft for integrating the ratchet holder 12, gear 15, clutch portion 16, and gear 17.

19 and 20 are integrated gears, 21 is a gear fixed to the output shaft of the motor 22, and the output of the motor 22 is transmitted to the shaft 18 via the gear train.

23, 24, 25° 26. 27, 28, and 29 are gears and also form a gear train, and the rotation of gear 150 is transmitted to the last gear 29, which is fixed to the sensitive material feeding roller 30. The rotation is transmitted to the gear 31.

Reference numeral 32 denotes an auxiliary roller that is paired with the roller 30 and feeds the photosensitive material.

Reference numeral 33 denotes a disc which is loosely fitted onto the shaft 35 of the gear 24 and forms a clutch between it and the shaft, and has a pin 34 implanted therein for driving a transverse plate to be described later.

The shaft 35 is fitted with the gear 24 so that only rotational motion is transmitted, and is movable independently in the axial direction, and is pushed by a spring 36 via an implanted pin 37 to approach the disk 33. In this state, the pin 37 engages with a protrusion (not shown) on the disk and transmits the rotation of the gear 240 to the disk 33, and when the head is pushed against the spring 36, the engagement is released and the rotation stops. It seems that it does not transmit.

The state shown in the figure is a state in which the various exposure operation levers 38 are rotated clockwise about the shaft 39, that is, the gear 24 and the disc 3
This is the state in which the engagement of No. 3 is released.

39a is a click spring of the multiple exposure lever 38.

40 is a transverse plate for feeding the film, and the pin 34
The engagement is performed at the bent portion 40a.

The other bent portion 40b is biased in one direction by the other end of a spring 42 which is bent over a dowel 41 whose one end is fixed to the camera body.

Reference numeral 40c denotes a guide elongated hole, which is fitted with a guide pin 43.

Reference numeral 44 denotes a leaf spring for feeding the sensitive material, which is fixed to the transverse plate 40.

Further, a friction member 45 is disposed at the tip of 44 so as to reliably feed out the photosensitive material 46.

Reference numeral 47 denotes a shutter charge lever. The shutter charge lever 47 is arranged so as to be swingable about a shaft 48, and is urged to rotate clockwise by a spring 49.

One end of the shutter charge lever 47 is bifurcated 47 a
, 47b, and can engage with the dowel 50 implanted on the gear 23.

The other end 47c can be engaged with one end 56b of a front curtain of a shutter, which will be described later.

When the dowel 50 contacts 47a of the shutter charge lever 47, the shutter is charged, and when it contacts 47b, the charge lever is returned to its original position.

51 is a gear to which rotation of the gear 150 is transmitted, and is integrated with the cam 52.

Reference numeral 53 denotes a stop lever, which is swingable about a shaft 54 and biased clockwise by a spring 55.
A switch SW2 is provided that is open when one end 53a is engaged with 52a and closed when the engagement is disengaged.

The other end 53b can be engaged with one end 58b of the rear curtain of the shutter, which will be described later.

56 is a front curtain constituting a known shutter;
A spring 57 is bent at 6a, and the other end 56b
can be engaged with the aforementioned shutter charge lever.

Reference numeral 58 denotes a rear curtain constituting the shutter. One end 58a is bent with a spring 58, and the other end 58b can be engaged with one end 53b of the stop lever 53, so that the rear curtain When traveling, the stop lever 53
cam 52 and stop lever 53.
disengage.

A pin 60 is implanted on the front curtain 56 and is swingable about a shaft 62 and can be engaged with a locking lever 61 biased clockwise by a spring 63.

SW1 is a second count start switch that opens when the locking lever 61 rotates counterclockwise due to the operation of the shutter button 70 and the front curtain starts.

64 is a stopper, and 65 is a pin installed in the rear curtain 58, so that when the front curtain is charged, the rear curtain is also charged.

Mg is a trailing curtain control magnet that releases the hold of the trailing curtain after a certain period of time by the shutter control circuit.

66 is a photographing lens, and TO is a shutter button.

A reversing lever 72 that is swingable about a shaft 71 is disposed on the other end of the locking lever 61, and is urged to rotate counterclockwise by a spring γ3.

74 is a spring hook on the locking lever 61 and a regulating pin of the non-reversing lever 72.

When the shutter button 70 is pressed, 72 is pressed through 70a, and since they are integrated by the regulating pin 74, the locking lever 61 rotates counterclockwise and when the shutter button is pressed further, the locking between 70a and 720 is released. Locking lever 61
is returned to the position shown in the figure by the spring 63.

However, the shutter front curtain has been moved and the main switch 548 remains ON.

Then, when the shutter button is released, 72 is reversed and returns to its normal position.

FIG. 2 shows an electric circuit for controlling the sensitive material feeding device in the camera according to the present invention.
1 to 506 are photometric time control circuits, in which a photocurrent generated in the photovoltaic photoelectric conversion element 501 charges a second time integration capacitor 503 connected between the input and output of the high input impedance operational amplifier 5020, and performs calculation. Amplifier 502
When the output voltage rises to the trigger level of the Schmitt trigger circuit 505, the Schmitt circuit 505 is reversed and turns off the shutter trailing curtain locking magnet Mg.

Swl is a switch for starting a second time count, and 504 is a constant voltage power supply for setting a bias level.

507 to 523 are circuits for checking the power supply voltage by flowing a current corresponding to the actual motor operation for a certain period of time after the rear curtain is operated.

When the trailing curtain locking magnet Mg is turned off, transistor 5
07. Since 509 and 510 are on and the transistor 508 is off, the first timer circuit consisting of the resistor 517 and capacitor 513 level detection circuit 514 starts counting, and the current equivalent to that when the motor is rotating is supplied to the circuit. In order to cause the current to flow, a dummy current flows through the dummy resistor 515.

If the power supply voltage falls below a certain constant voltage during this certain period of time, the comparator 516
The voltage at the inverting input terminal is lower than that at the non-inverting input terminal, which is supplied with a higher bias voltage, so it is inverted, turns on transistor 522, launches the launch circuit described below, and further prohibits power supply to the motor circuit. do.

In addition, the first timer circuit consisting of 512 to 514 is inverted,
When the output of the level detection circuit 514 becomes 0 level, the transistor 521 is turned on and the non-inverting input voltage of the comparator 516 becomes low. Even if the power supply voltage becomes lower than the check voltage, the comparator 516 will not be inverted and the power supply to the motor circuit will not be prohibited.

524 to 531 are latch circuits, and when the power supply voltage check circuit is in operation, when the power supply voltage falls below a certain voltage, the comparator 516 is inverted, and if the transistor 522 is turned on even momentarily, the transistors 524 and 525 are also turned on, providing positive feedback. This circuit enters a self-holding state.

In this case, the transistor 534 is turned off to prohibit power supply to the motor circuit, and the motor inoperability warning light emitting element 532 emits light to warn the photographer.

During operation of the power supply voltage check circuit, if the power supply voltage is higher than a certain voltage, the comparator 516 is not inverted, the transistors 522, 524, and 525 are turned off, and the transistor 534 is turned on, so that power is supplied to the motor circuit.

When the first time constant circuit is inverted, the transistor 535 is turned on and the transistor 536 is turned off, so that the resistor 538,
A second circuit consisting of a capacitor 539 and a level detection circuit 540
The timer circuit starts counting.

After a certain period of time, the level detection circuit 540 is inverted and turns on the transistor 541, so that power supply to the motor 542 is started and the motor rotates.

Resistor 543, transistor 544, transistor 545
, a diode 546 is a brake circuit for abruptly stopping the rotation of the motor when the mechanical switch Sw□ is turned off.

548 is a main switch of the circuit, and 549 is a power battery.

Next, the operation of the camera will be explained with reference to FIGS. 1 and 2.

(1) During general shooting (when there is sufficient power, the camera is motor driven, and multiple exposures are not performed).

) When the main switch 548 is turned on using an operation button (not shown), the photometry circuit is activated.

Next, when the shutter button 70 is pressed, the locking lever 63 is rotated counterclockwise to release the front curtain 56 and the second count start switch Sw1 is turned to OFF.
FF.

After a predetermined period of time, the rear curtain control magnet (Mg) turns OFF'L.
The second curtain is released.

When the trailing curtain completes its travel, the stop lever 53 swings counterclockwise to release the stop of the winding system, and at the same time, the switch Sw2 is turned ON and power can be supplied to the motor.

When a signal is output to Mg (rear curtain control magnet), the power supply is checked next, and if there is sufficient power, the motor is driven, and the pin 34 pushes the transverse plate as the disk rotates 330 times, causing the transverse plate 40 to move to the right in the figure. The photosensitive material 46 is moved to a position where the leading end of the photosensitive material 46 is caught by the rollers 30 and 32.

At this time, the manual feeding mechanism does not operate at all due to the one-way clutch 100.

Further, since the rollers 30 and 32 are also driven by a gear train, the unwound photosensitive material 46 is further advanced.

A little after the photosensitive material 46 comes off from the rollers 30, 32, the stop lever 53 falls into the recess 52a of the cam 52, and the switch sw2 goes to 0FFL, and the motor is electrically braked and mechanically stopped.

The shutter charge lever 47 also operates while the photosensitive material is being fed.
Charge the shutter and return to the original position.

That is, the state shown in FIG. 1 is reached.

(2) When the motor is driven and the power supply becomes insufficient for feeding the sensitive material.

For shutter exposure, the shutter operates in the same manner as in the above case, and at the power check stage, it is determined that the power is insufficient, and the motor is not supplied with power, and the motor non-operation warning light-emitting element 532 is emitted to alert the photographer. Warning.

If you wish to carry out subsequent feeding, you can either renew the power supply or use the manual feeding mechanism described later.

(3) When using a manual feeding mechanism.

As mentioned above, after the shutter is activated, if the power supply is insufficient for driving the motor, power is not supplied to the motor 542, but by rotating the winding lever 1,
Feeding is performed in the same way as when driving a motor, and after feeding,
It will look like Figure 1.

At this time, rotation is not transmitted to the motor 542 by the clutch 16.

Of course, if the clutch 16 is removed, the motor 542 can be used as a governor.

In the case of manual feeding, the mechanical governors 3, 6, 7° 8.9, 10, 11 operate so that the sensitive material is fed at a substantially constant speed.

Of course, other known governor mechanisms can easily be used.

(4) When performing multiple exposure (including automatic and manual exposure), shutter operation is the same as in the case described above.

By rotating the multiplexing lever 38 clockwise as shown in FIG. 1, the shaft 35 is pushed against the spring 37, the pin 36 and the disc 33 are disengaged, and the feeding rollers 30 and 32 are driven. Even if the rollers 30 and 320 rotate, the traverse plate 40 does not operate because the disk 33 does not rotate, and the photosensitive material 46 is not fed even though the rollers 30 and 320 rotate.

Therefore, the feeding of the photosensitive material 46 is not performed, but only the shutter charging is performed.

Here, the multiple exposure lever 38 is rotated counterclockwise to integrate the gear 24 and the disc 33.

Next, when the shutter is released, exposure is performed again, and then the feeding gear train rotates to feed the sensitive material and charge the shutter.

Of course, it goes without saying that the multiple exposure is not limited to double exposure, and when multiple exposure is to be performed, the multiple exposure lever 38 may be operated according to the photographer's wishes.

In this embodiment, the sensitive material is fed out mechanically, and the feeding section is activated or deactivated, but the feeding section is electromagnetically operated, for example, with a solenoid, the traverse plate is actuated, and the multiple operation button is activated. The solenoid may be electrically deactivated by turning the switch ON-OFF.

It goes without saying that even in the mechanical case, a clutch section may be provided between the gears 23 and 24 to disable the rollers as well.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a sensitive material feeding device used in a camera according to the present invention. FIG. 2 is an electrical circuit diagram for controlling the sensitive material feeding device in the camera according to the present invention. 46...sheet-like sensitive material, 30,32...
・Roller 70... Shutter button, 63.
...Latching lever, swl...Count start switch for seconds, 53...Stop lever,
40...Transverse plate, 100...One-way clutch, 52...Cam.

Claims (1)

[Claims] 1. Two rollers for feeding the sheet-like photosensitive material,
A feeding device for feeding a sheet-like sensitive material in conjunction with charging of a shutter, the feeding device having a feeding device for causing a leading end of the sensitive material to be caught between the rollers prior to feeding by the roller. A manually operable latch is provided between the feeding gear train and the feeding device, and when the clutch is disengaged, the feeding device is deactivated so that the shutter can be charged without feeding the sheet-like photosensitive material. A camera that is characterized by: