JPH0233228Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that drives a sounding body during self-photography to display audible information indicating that the self-timer is in operation.

2. Description of the Related Art A camera is conventionally known in which a sounding body is provided within the camera body and the self-timer is used to indicate when the self-timer is operating. This camera is provided with an oscillator that operates together with a self-timer, and a sounding body to which the pulses output from the oscillator are input. Generally, in the case of photographs of people, it is convenient because it is possible to know when the shutter device is operating by listening to the sound of the sounding body. However, when photographing still life, night scenes, etc. for long periods of time, self-photographing is often performed to prevent camera shake. In such a case, since the photographer is very close to the camera, there is no need for a sound display, and in fact, it is often easier to take pictures without sound.

For this purpose, as known from Japanese Utility Model Application Publication No. 56-85820, a sound generation display device is known in which the sound generator can be switched off when the sound generation display is not required. However, since this sound generation device uses a dedicated switch to turn the sound display on and off, a new switch operation section must be installed on the camera, and the built-in space is difficult to operate. There is a problem.

This invention was developed to solve the above problem, and is a self-timer that allows you to turn on and off the sounding body for displaying the self-timer operation simply by operating the release button that is operated to start the self-timer. The purpose of the present invention is to provide a timer operation display device.

In order to achieve the above object, the present invention sets a flip-flop when the self-switch is turned on in conjunction with the depression of the release button to operate the self-timer and oscillation means. The flip-flop remains set until the self-timer completes operation, and remains set even when the self-switch is turned on again. The signal from the self-switch is supplied to a counter, and this counter is repeatedly set and reset each time the self-switch is operated. A gate circuit opens and closes in response to the set and reset states of the counter to determine whether or not to supply pulses from the oscillation means to the sounding body.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In FIG. 1, a resistor 1, a self-mode switch 2, and a self-switch 3 are connected in series. The selfie mode switch 2 is attached to a camera body (not shown) and is set to the ON position when taking a selfie. The self-switch 3 is turned on when a release button (not shown) is pressed. Please note that this release button is
The locking mechanism does not lock it in the position you press it in, but returns it to its original position when you release your finger.

A connection point 4 between the resistor 1 and the self-mode switch 2 is connected to a flip-flop 5 via an inverter 13.
It is connected to the set terminal S of. The output terminal Q of this flip-flop 5 is connected to the self-timer 6,
They are connected to an oscillator 7 and an oscillator 8, respectively.

The self-timer 6 is activated by receiving the output from the output terminal Q when the flip-flop 5 is set, and measures a predetermined period of time, for example, 10 seconds, and starts the shutter device 9 by a signal when the timing is finished.
to expose the film. At the same time, the signal when the self-timer 6 finishes counting activates the pulse generator 10, for example, a one-shot multivibrator, and inputs the generated pulse to the reset terminal R of the flip-flop 5 to reset it. The oscillator 7 generates high frequency pulses, and the oscillator 8 generates low frequency pulses.

The output terminal Q of the flip-flop 5 and the output terminals of the oscillators 7 and 8 are connected to the input terminal of the AND circuit 11.
4KHz pulse and 4Hz output from oscillator 8
The pulses are combined and the resulting pulse is sent to the AND circuit 12.

The output of the inverter 13 is connected to the NAND circuit 1
is connected to one input terminal of 4, and
The output terminal Q of the flip-flop 5 is connected to the other input terminal of the NAND circuit 14. this
The output signal of the NAND circuit 14 is the binary counter 1
5 and is counted at the rising edge of the output signal. The output signal of this binary counter 15 is input to the AND circuit 12.

A transistor 16 is connected to the output terminal of the AND circuit 12, and this transistor 16
When turned on, a sounding body 17 such as a buzzer is driven to generate a sound.

FIG. 2 shows waveforms of the circuit shown in FIG. 1. When taking a selfie, first turn on self mode switch 2, then press the release button and turn on selfie switch 3. When this release button is released, it returns to its original position, and self-switch 3 is also turned off. When the self-switch 3 is turned on once, a low level (hereinafter referred to as "L") signal a is input to the set terminal S of the flip-flop 5, and the flip-flop 5 is set. flipflop 5
When is set, signal b is input to self-timer 6 and oscillators 7 and 8, which are activated.
At the same time, the output signal h of the NAND circuit 14 becomes high level (hereinafter referred to as "H"), so
The advance counter 15 is incremented and the signal i becomes "H".

The signal e outputted from the oscillator 7 and the signal f outputted from the oscillator 8 are combined in an AND circuit 11, and the resulting signal g is sent to an AND circuit 12. This AND circuit 12 is a binary counter 15
The signal g is passed when the output is "H", and the signal g is not passed when the output is "L". AND circuit 12
The signal j output from is input to the base of the transistor 16, turns on the transistor 16 according to the pulse period of the signal j, drives the sounding element 17, and produces a sound indicating that the self-timer 6 is operating. Occur.

When 10 seconds have elapsed after the start of the self-timer 6, the signal c becomes "H", and the shutter device 9 operates to perform exposure. At the same time, the pulse generator 10
generates pulse d and flip-flops 5 and 2
The advance counter 15 is reset. This stops the operation of the oscillators 7 and 8, so the signal g becomes "L".
Then, the signal i also becomes "L", and the sounding body 17
operation stops.

To prevent the self-timer 6 from producing sound while it is in operation, the release button can be pressed twice. Since the self-switch 3 is turned on twice in conjunction with the release button, the signal i of the binary counter 15 becomes "L", and the AND circuit 12 closes to prevent the signal g from passing. Therefore, the sounding body 17
is not activated, only the self-timer 6 is activated, and when 10 seconds have elapsed since the first press of the release button, the shutter device 9 is activated to perform exposure.

As described above, according to the device of the present invention, when the release button is pressed once, the flip-flop is set and the self-timer and oscillation means are activated, thereby performing normal self-timer photography with sound display. Then, the next time the release button is pressed, the gate circuit is closed while the self-timer continues to operate, thereby cutting off the supply of pulses from the oscillating means to the sounding element. Therefore, while the self-timer continues to operate once it has been activated, it is now possible to easily turn on and off the drive of the sounding element by simply pressing the release button, which simply simplifies the operation. Since there is no need to separately provide an operation section for switching on/off the pronunciation display, it is also advantageous in terms of saving installation space.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. FIG. 2 is a waveform diagram of the circuit shown in FIG. 1. 2... Self mode switch, 3... Self switch, 5... Flip-flop, 15... Binary counter, 17... Sound generator.

Claims (1)

[Scope of Utility Model Registration Claim] (1) A self-switch that is turned on in conjunction with pressing the release button, and that is set in response to an on-signal from this self-switch and maintained in the set state until a reset signal is input. a flip-flop, a self-timer that is activated in response to an output signal from the flip-flop in a set state and that clocks a certain period of time and outputs a predetermined signal; and an oscillation means that generates a drive pulse; a pulse generator that receives a predetermined signal and supplies a reset signal to the flip-flop; and a pulse generator that alternately sets each time it receives an on signal from the self-switch.
a counter that is repeatedly reset and reset when receiving a reset signal from the pulse generator; a gate circuit that passes or cuts off the drive pulse from the oscillation means in response to the setting and reset of the counter; A self-timer operation display device comprising a sounding element activated by a drive pulse passed through a gate circuit. (2) The utility model registration claim is characterized in that the oscillation means consists of two oscillators, one high frequency and one low frequency, and a pulse obtained by combining the two pulses is input to the gate circuit as a driving pulse. A self-timer operation display device according to scope 1.