JPS60179727A - Automatic film advancing device of camera - Google Patents

Abstract

PURPOSE:To shorten the time required for setting the next photographing ready condition not only for one frame photographing, but for low-speed continuous photgraphing without using any circuit of a different system, by providing a circit which generates an exposure operation inhibiting signal and generating the signal under a condition corresponding to the photographing mode of one frame photographing, low-speed continuous photographing, etc. CONSTITUTION:In the case of low-speed continuous photographing, a switch SM1 is turned on and another switch SM2 is turned off. Because of the switch SM2 being turned off, the output of an OR2 is always high. On the other hand, since the bottom terminal of an OR1 becomes low, output of the OR1 becomes high only when its top terminal becomes high under a certain condition. When the certain condition is set while a switch S2 is turned on, an i2 becomes high. The certain condition is that a switch S4 is turned off after film forwarding original operation is complete and a capacitor C1 is discharged through resistances R3 and R4, and then, the (a) point rises to a certain threshold and top terminal of OR1 becomes high in level. Under a low mode, the time required by the i2 becoming high is delayed by the delaying operation of the circuit composed of the capacitor C1 and resistance R3 and R4 and the interval is prolonged by the delayed time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic winding device for a camera that allows selection of continuous shooting mode and single frame shooting mode.

Conventional technology In cameras equipped with an automatic winding function, the film is normally wound after the shutter release button is pressed toward the viewer after the photograph is taken.

You can also choose between two modes for continuous shooting: high speed and low speed. Click here to enter low-speed continuous shooting mode (
As a conventional technique for realizing the L7-de), there is a technique that takes time for the shooting interval between the completion of one shooting and the start of film winding, and performs the shutter release operation when film winding is completed. Kosho 54-27139
), which generates a release signal intermittently at each shooting interval regardless of the completion of winding (Special Publication No. 57-535
79), a method in which the time from the start of the shutter release to the start of film winding is fixed and the shutter release operation is performed when winding is completed (Special Publication No. 55-2607)
etc.

By the way, in the case of single-frame shooting (we will call it S mode), the film will start to advance after you release the shutter release button, and then the film will continue to advance until you can take the next shot.
You have to wait for at least one frame of film to be rolled up. On the other hand, even in S mode, you may want to take another shot as soon as possible after completing one shot, and as mentioned above, if the film is advanced after releasing the release button, the probability of missing a photo opportunity increases accordingly. I'm coming.

Therefore, even in the S mode, it is desirable that film winding be automatically started after exposure is completed, regardless of whether or not the release button is released.

Also, in the case of high-speed continuous shooting (referred to as H mode), as long as the release button is pressed, the following operations are automatically repeated in the order of shutter release, exposure completion, film advance completion, and shutter release. However, if it is possible to perform both H mode and L mode, it is necessary to provide a separate control circuit from that for H mode in order to increase the shooting interval, which increases the complexity of the circuit configuration. Purpose The present invention is an automatic winding device for a camera, which winds the film when exposure is completed in S mode as well as H mode, thereby shortening the time until the next IT is possible. The aim is to make this possible without using a separate circuit for each mode.

Structure The present invention provides an H mode of the film winding device that starts film winding upon completion of exposure while the shutter release button is pressed, and sends a signal to the camera control circuit to start the next exposure operation upon completion of film winding. In the circuit structure 1ffll, another condition is set for the start of the exposure operation, and in H mode, this condition is always met, and in S mode and L mode, this condition is given separately. did.

Embodiment FIG. 1 is a circuit diagram showing essential parts of an embodiment of the present invention, and FIG. 2 is a simplified flowchart of the operation of the camera control circuit. Here, the camera control circuit controls exposure operations such as photometry, exposure value calculation, aperture setting, and shutter control. An overview of this embodiment will be explained with reference to FIGS. 1 and 2.

The camera control circuit includes il, i2. Three signals of i4 are input. il becomes H (High) when the switch S1, which is turned ON in the first step of pressing the shutter release button, is turned ON. i4 is turned on in response to the completion of exposure (for example, when the shutter is closed) and remains H while switch S4, which turns off when the film has been wound by one frame, is off.

That is, while i4 is L (Low), the film is being wound. In principle, if i4 is H and switch S2, which is turned ON in the second step of pressing the shutter release button, is ON, the exposure operation will start and continuous AMi il shadowing will be performed. Conditions are given for the start of the exposure operation, and the exposure operation is started when both 12°i4 are H.

Press the shutter release button and turn on switch S1
Then, il becomes H, interrupting the operation of the camera control circuit, and starting the operation flow shown in FIG. 2. First, photometric calculation is performed in step A, and it is determined whether or not 12 is H in step A. Switch S while the release button is pressed to the first stage but not to the second stage.
Since 2 is OFF, the output of inverter INx is L, and therefore 12 is L. In such a case, the judgment of the mouth is No, so the operation jumps to step .If the release button is released at this point, the step is No, so this interrupt operation ends. If step A is YES, the operation returns to step A. When the release button is pressed to the second stage, the switch S2 is turned on, and the conditions described later are met, the mouth step becomes YES'S, and the operation proceeds to step C. In step C, it is determined whether i4 is H or L. Except during film winding, i4 is H, the determination is YES, and exposure is started).

When exposure is completed, switch S4 is turned on and i4 is set to L.
Therefore, step E is waiting for the completion of exposure, and when the exposure is completed, step E becomes 14=
If the answer is L, the result is NO, and the operation proceeds to step . S4 is ON
At this point, the potential at point a suddenly drops, but a differential circuit is formed by capacitor C1 and resistor R5, and the differential signal of the falling point at point a is sent to the motor drive circuit to start winding the film.

If the release button is still pressed in step 5, 11-
Since it is H, the step is YES, and the operation is IF.
Go back, mouth, and go forward. In this step, i4 is H
In other words, it waits for the film winding to be completed and the switch S4 to be turned OFF to become 14-H. When the film winding is completed, step C becomes YES, so the exposure operation is performed again. In the case of S mode, when the -th exposure operation returns to the mouth step, it is 12-L, and the operation jumps to "low" and "low" steps until the release button is released. If the step to is NO, the interrupt operation ends and the shooting of one frame ends.

The operation of the circuit of FIG. 1 in the H mode will be explained. In H mode, both switches SMI and SM2 are kept OFF. Therefore, the lower input terminal (hereinafter simply referred to as the lower terminal) input of the OR circuit Q RL ORz is always high.
Therefore, the outputs of both OR circuits are both H level. Therefore, the output of the AND circuit ANI becomes H, and this H
The signal is inverted by the inverter IN3, becomes an L level signal, and is applied to the base of the transistor Q4. Therefore, Q4 is in the OFF state and the terminal TI is always at H level. When the release button is kept pressed in the H mode, the switch S2 is continuously ON, so the output of the inverter INx is H, and the output 12 of the AND circuit ANX is continuously H. Referring to the flowchart in Figure 2 here, both steps to the mouth are continuous.
Since it is ES, the movements are I99, Ro, Honey, and Po.

Proceed to , return to A, and continue this cycle until you release the release button and the mouth step becomes No.

The operation of the circuit shown in FIG. 1 will be explained in connection with the case of S mode. In this case, SM1 remains OFF and 5M2 turns ON. Therefore, the output of the OR circuit ORI is always H, but since the lower terminal of OR2 is always connected, the upper terminal input of OR2 will not become H unless a certain operation is performed, and the output will not become H. . When the release button is not pressed to the second stage and switch S2 is OFF, the upper terminal input of OR2 is H, the output is also H, and the output of ANI is R1, so transistor Q4 is OFF and T1-H. However, since the output of INx is L at this time, it is 12-L. Therefore, 12 becomes H due to the action of the delay circuit consisting of resistors R11 and C3 immediately after S2 turns on.
The upper terminal of TI remains high for a short period of time, and TI remains high for only that time.
Therefore, 12=H. Then, when the release button is pressed, the operation shown in Fig. 2 starts, and when the release button is pressed to the second step after 49 openings, the opening step temporarily becomes YES, and the operation is Ha.

Proceed to 2, ho, and so on. Even after the exposure is completed, as long as the release button is not released, the operation will return to 41 shots, but at the mouth step, that is, the upper terminal of OR2 is at L, so the exposure operation will not be restarted, and the operation will continue with the mouth step. It jumps from to to, and then finishes one shooting operation.

Finally, the operation of the circuit shown in FIG. 1 in the L mode will be explained. In this case, switch SMI is turned on and 5M2 is turned off.
Let it be F. Since 5M2 is OFF, the output of OR2 is always H.
It is. On the other hand, since the lower terminal of ORI becomes L, the output of ORI becomes H only when the upper terminal becomes H under the following conditions, and 12 becomes H when the above condition is satisfied when switch S2 is ON.

This condition is such that when the winding of the film is completed and the switch S4 is turned off, the capacitor CI is discharged through the resistors R3 and R4, rising to the threshold value at which point a is formed, and the OR
This is when the upper terminal of 1 becomes H level. In the H mode, the first step is always 2 Y E S, so the next exposure starts immediately when the film winding is finished at the step C and 14-H is reached, but in the L mode, ClR3,R
Due to the delay effect of the circuit No. 4, there is a delay in the mouth step becoming YES, and the interval between continuous shooting becomes longer.

FIG. 3 shows the entire embodiment of the present invention, and the same parts as those in FIG. 1 are given the same reference numerals. Similarly, Fig. 4 is a flowchart showing the details of the operation of the camera control circuit. Steps corresponding to each step in Fig. 2 are given the same reference numerals, and when one step in Fig. 2 consists of multiple steps, Yes 1. It is numbered 1 like 2.

In FIG. 3, A is a circuit on the camera side, B is a circuit on the motor drive side, and T1 to T6 are connection terminals between the two circuits.

In addition, C is a film container (so-called long magazine) that can store, for example, 250 frames of long film.
ll is a connection terminal between the container and the motor drive. M is a motor for winding and rewinding the film.

- When the exposure for photographing is completed, switch S4 is activated as described above.
becomes QN, transistor Q1 becomes conductive, and a negative pulse is output from the differentiating circuit consisting of contenzer C1 and resistor R5. This pulse is inverted by inverter INS and applied to the base of transistor Q7, Q7 becomes conductive, and relay RLI is excited, the movable contact of the relay comes into contact with one of the upper contacts, and the motor M rotates forward to wind up the film. Continuity of Q7 is self-supported via the above-mentioned upper contact and resistor R24.

When a portion of the winding is completed, the switch S4 on the camera side is turned OFF, and the switch SM3 on the motor drive side, which is temporarily turned ON when the winding torque exceeds a predetermined value, is turned ON, and the AND circuit AN4 , transistor Q6. through inverter IN6. When the base of QIO becomes 1 lvl, V), Q7 turns OFF and motor M stops. The switch S6 is a switch that detects the presence or absence of film during film rewinding, and is turned ON when film rewinding is completed and the film runs out. Therefore, normally S6 is OFF, the output of OR circuit OR7 is H, and switch SM3 of AND circuit AN4 is ON.

The signal when turned off is transmitted to transistor Q6. Obtained a transfer to QlO. J is a circuit that outputs a signal for rewinding the film in response to release of the release button when all photography is completed for one film. Transistor Q9 is made conductive by the film rewind signal, and relay RL2 is activated. The movable contact contacts the upper contact, and the motor M rotates in reverse to rewind the film.

When using a long film, there is no film in the film container.
A comparator Co+ηp for C is also provided. In the case of a long film, once the shooting of one film is completed, the film is wound without rewinding. For this reason, the camera user does not know that the shooting of one film has ended even after shooting has finished, and tries to continue shooting. Therefore, a switch SBI is provided, and when the film runs out, it is turned on, turns on the transistor Q4, prohibits shutter release, and repeats 1 (, N) to notify that the film is out. When taking pictures, the film gets tangled when the film is wound up, so when the film is not set, switch SB2 is turned on to prohibit the shutter release. When the power supply voltage of becomes lower than the reference voltage Vref,
This is done by turning on the transistors Q1,,1.

Flowcharts 21 to 20 in FIG. 4 show details of the second step in FIG.

Steps 5 and 23 are for determining whether the switch S3 in Figure 3 of the delay device is ON or OFF, and the time taken into consideration for the operation of the aperture, mirror, etc. is set, and the elapsed time is determined. I turns off, narrows down the aperture,
After the mirror amplifier is completed, I will start the first curtain. Steps G and H are operations when using a self-timer. When using the self-timer, switch S5 in Figure 3 is turned OFF, so steps G and γS intervene for 10 seconds. After the time has been counted, the exposure operation is started.

Effect The present invention adds a release prohibition signal generation circuit to the configuration that winds the film upon completion of exposure and starts the next exposure operation after the completion of winding, and when there is no release prohibition signal from the circuit, H mode photography is disabled. The timing for generating or blocking the prohibition signal is set according to the S mode, L mode, etc. Based on the H mode, other shooting modes can be modified by modifying the operation of the ■ mode. Therefore, it has the characteristic that various operations can be realized by modification without changing the circuit configuration.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a circuit diagram showing the main parts, and FIG. 2 being a flowchart showing an outline of the operation.
FIG. 3 is a circuit diagram of the entire device, and FIG. 4 is a detailed flowchart of the operation. SL, 7--Switch that is turned ON in the first step of pressing the shutter release button, S2...Switch that is turned ON in the second step of pressing the shutter release button, S4. ,,Switch is turned ON in response to completion of exposure and turned OFF in response to winding of one frame of film.
Ml...Switch to turn on when in L mode, 5M
2... ONI rub switch when in S mode, A.
...Camera side circuit, B...Motor drive side circuit, M...Film winding and rewinding motor, RLI
. RL2...Relay. Agent Patent Attorney Kosuke Agata

Claims (1)

[Scope of Claims] fi+ An automatic winding device having a high-speed continuous shooting mode that starts film winding when exposure is completed and starts the next exposure operation when film winding is completed, comprising a circuit that generates an exposure operation prohibition signal, - An automatic winding device for a camera, characterized in that the signal is generated according to conditions according to a shooting mode such as frame-by-frame shooting or low-speed continuous shooting. (2) In a configuration in which the exposure operation prohibition signal is constantly output, the generation of the above signal is always stopped during high-speed continuous shooting, and when the shutter release button is pressed again during -frame swing, the above signal is temporarily output. 2. An automatic winding device for a camera according to claim 1, wherein the signal is cut off after a certain period of time after film winding is completed during low-speed continuous shooting.