JPS59159143A - Device for preventing camera from malfunction - Google Patents

Abstract

PURPOSE:To prevent a camera from malfunction with a simple constitution requiring no film winding discriminating switch or the like and to improve the reliability of the camera by taking out information from the working of a shutter and controlling a working element. CONSTITUTION:When a movable chip SC of a shutter switch interlocked with a shutter is moved from a fixed contact SA to a fixed contact SB and abutted to the contact SB, a shorted capacitor C1 is charged and the output of a comparator CP is inverted to the high level. The abutted status between the movable chip SC and the contact SB is continued until the film winding is completed and the movable chip SC is abutted to the contact SA again. Therefore, an input terminal (a) of an IC for the working element AE for date copying and selftimer is kept at the high level and the element AE is not worked until the completion of the film winding. In such a simple constitution requiring no film winding discriminating switch or the like, and auto-date copying, selftimer, etc. are prevented from malfunction and the reliability of the camera is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is a small, portable camera whose general operation is controlled by an electrical control unit, and a method for preventing malfunctions that occur when the release switch is turned on. The present invention relates to a device for preventing malfunctions in a camera.

BACKGROUND OF THE INVENTION In recent years, electronic cameras equipped with control circuits such as ICs have come into widespread use due to the trend towards cameras that are portable, easy to operate, and have good performance.

These electronic cameras had the effect of reducing the number of parts compared to conventional mechanical cameras, but on the other hand, these electronic cameras had many switches installed inside the camera to transmit information. I had to take it out. Switches such as these do not require contact and may cause accidents.
There has been a demand for electronic cameras to be able to perform necessary operations with as few switches as possible.

In cameras with conventional electronic circuits, when the release switch is turned on even when the film has not been advanced (the preparation for shooting has not been completed), the self-timer, which is an electrical operating element, is activated. There were disadvantages in that the display lamp would light up and people would misunderstand that you were taking a picture, and the date device would work with auto-date cameras and imprint the date. Conventionally, as a countermeasure against this problem, a switch was used to determine whether or not winding of the film was completed. Figure 1 shows a conventional circuit diagram. sl and s2 are the first and second stage switches when the release button is pressed, and sw is a switch for determining whether to wind up the fill 1 or the next spring. When the determination switch sw determines whether the film will be released next spring by the circuit, the self-timer light emitting element LED, which is an operating element, is controlled not to light up even if the switches S1 and S2 are turned on. When such technical means for preventing malfunctions are busy, the number of parts increases, which often causes failures and the like.

OBJECTS OF THE INVENTION It is an object of the present invention to solve the problems associated with the conventional release operation, simplify the camera mechanism, and improve the reliability of the camera.

Structure of the Invention The present invention solves the above-mentioned problems associated with the release operation by extracting information from the shutter operation.The present invention inputs the output of a circuit including a switch that turns 0N10FF when the shutter is activated into the control section, 0N10F with release operation member
The present invention provides a malfunction prevention device for a camera, characterized in that an operating element operated by a switch that is turned F is controlled by the input.

Embodiment FIG. 2 is a circuit diagram showing one embodiment of the present invention. Since the present invention utilizes a shutter operation circuit, this portion of the circuit will be explained first. In the figure, Mg is an electromagnet for closing the shirt shirt. CP is a comparator, CdS is a photoconductive element for photometry, and C.1 is .tau.. The exposure time is given by the resistance value of CdS and the capacitance of CI. Also 5A
XSB and SC are a group of switches that operate the shutter, with 8 fixed contacts and a movable contact SC on top of SS, moving from the bottom (contacts SA, gePt connection) to the top (contacts SB, S).
C is connected) when the shutter is activated.

In the initial state, that is, before the shutter is operated, the movable contact piece S
C is in contact with the fixed contact piece HA as shown, and the capacitor 〇IK is in a shortened state.

In connection with the shutter operation, that is, the opening operation of the shutter,
The movable contact piece SC slides upward and comes into contact with the fixed contact piece SB.

From this point on, charging of the comedencer-01 begins.

The comparator CP is in the LOW state until the terminal CP reaches a predetermined voltage, so the electromagnet Mg is ON and the shutter is kept open. When the terminal CP reaches a predetermined voltage, the comparator CP is inverted to HIGH,
The electromagnet Mg is turned OFF and the shutter is closed.

The movable contact piece SC of the shutter switch remains in contact with the fixed contact piece SB until the next 7-shot charge for the next i-shade and the film e-lift are performed.

Although the exposure control circuit shown in FIG. 2 is not shown, it is activated by a switch that is turned on at the initial stage of camera release using a conventionally known method, but the release button is pressed without shutter charging or film winding. When you press
As mentioned above, the movable contact piece SC contacts the fixed contact piece 5BIC,
Comparator CP becomes HIGH.

The actuating element AE, on which the self-timer display or date imprinting takes place, is connected to the IC. The IC is configured such that the input terminal lea of the IC operates at, for example, 1.4 V or less, and the operating element AE operates. In the figure, Dl and D2 are diodes, and SS is a release switch.

When the film is wound, the output signal of the comparator CP is LOW, so by turning on the release switch SS, the voltage at the input terminal ICa of the IC becomes lower than, for example, 1.4V, and the IC starts operating. Then, the self-timer display or date imprinting, which is the operating element AE, is performed.

When the release button is pressed with the film loaded next spring, the output signal of the comparator CP will be HI as described above.
Since it is set to GH, turn on the release switch SS.
Then, the voltage at the input terminal ICm of the IC is, for example, 1.4V.
At the higher voltage, the IC is inactive and the activation element AE does not perform any operation.

That is, the circuit described in the embodiment of FIG. 2 constitutes a slang operation prevention device for a camera.

Effects of the Invention The present invention extracts information from the shutter operation to operate the operating elements without malfunction, which reduces the number of switches, simplifies the mechanism, and improves reliability. Buko.

[Brief explanation of drawings]

FIG. 1 is a conventional control circuit diagram of operating elements, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. AE・・・・・・・Activating element SS・・・・Release switch Mg・・・・
...7 Yanta solenoid CP6...
・Comparator SA, 5RXSC...Shattasinchi agent Yoshimi Kuwabara

Claims (1)

[Claims] Input the output of the circuit including a switch that turns 0N10FF when the shutter is activated into the control unit, and turn it on with the release operation member.
/ A malfunction prevention device for a camera, characterized in that an operating element that is activated by a switch that is turned OFF is controlled by the input.