JPS58123526A - Self timer device - Google Patents

Abstract

PURPOSE:To automatically release the selection of a self timer mode, by providing a storage means for storing the self timer mode, and resetting it by a signal which is generated at the time of completion of the self timer mode control. CONSTITUTION:When a switch button 4 is depressed in a moment at the time of setting a self timer, a pulse having a high level is outputted in an instant from an NAND gate 8 to set a flip-flop 10. A Q-output obtains a high level to transmit the high level signal to a driver 11, and an indicator 5 is turned on to display that a camera is set in the self timer mode. The Q-output having a high level is inputted to a sequence controller, too, to set photographing sequence to the self timer mode. After a series of picture photographing sequences have ended, an END signal obtains a high level from 12 to reset flip-flop 10 and to release the self timer mode.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-timer device for a camera, and more particularly to an electronic self-timer configured so that the self-timer mode is canceled immediately after photographing in the self-timer mode.

Conventionally, when taking pictures in self-timer mode with a camera equipped with an electronic self-timer, a switch is turned on to set the self-timer mode, but photographers often forget to turn off this switch and are unable to take the next picture. This caused the inconvenience of unexpected self-timer mode. Therefore, in order to solve this problem, it has been proposed to mechanically release the self-timer switch in conjunction with the end of the shooting operation, but this method requires a mechanically complex configuration, which reduces the size, cost, etc. Installation is tNt'4
It had various restrictions and was not suitable for the current situation.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a self-timer mode that automatically cancels the selected self-timer mode when self-timer mode photography ends, using a simple circuit configuration. The purpose is to provide timer coloring.

An embodiment of the self-timer device according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a camera to which a self-timer device according to the present invention is applied, in which 1 is a camera body, 2 is a shutter release button, 3 is an eyepiece, and 4 is a device for setting the self-timer device according to the present invention. This is a push-button switch that switches the contact during suppression. Reference numeral 5 denotes a display for indicating whether or not the self-timer has been set, and is composed of a liquid crystal or the like.

FIG. 2 is a circuit diagram showing an embodiment of the self-timer device according to the present invention, in which the switch contact 4 is normally in contact with the side a, and only when the push button 4 in FIG. 1 is depressed, that is, when the self-timer is set. A push button switch whose switch contact contacts the b side, 6.7 is a pull-up resistor for one input terminal of the Nant gate 8.9, and depending on the state of the switch 4, the input terminal of the Nant gate 8.9 is connected to the push button switch. Gives a high level signal or a low level signal. These Nant gates 8 and 9 absorb chattering occurring in the switch 4, and their outputs are connected to the set input terminal of the 7 ribs 70 tubes 10.

This flip-flop 10 is a set/reset type flip 70 that stores a self-timer mode, and when its output Q is at a high level, it indicates that it is in the self-timer mode. 11 is a driver circuit for the display 5, which drives the display 5 when the output Q of the flip-flop 1o is at a high level. Reference numeral 12 denotes a sequence controller that performs known camera sequence control, and is configured to perform self-timer mode control when the output Q of the flip-flop 1° is at a high level. Also, this sequence controller 12 is the one that ends the self-timer sequence. After a series of photographing is completed, such as after the completion of photographing or after the completion of winding the film for the next photograph, the signal END is output and this signal is input to the glue set terminal R of the 7 lip-flop 1o.

Next, the operation in the above configuration will be explained. First, in FIG. 2, when the switch 4 is on the a side, the output of the Nant gate 9 is at a high level, and the inputs of the Nant gate 8 are both at a high level.

Therefore, the output of 8 becomes low level, and the low level signal is input to the set input S of 7 lip 70 tube 1o. At this time, the Q output of the 7 lip-flop 10 is at a low level. Next, by momentarily pressing the switch button with a fingertip, the switch 4 contacts position b and returns to position a again. At this time, a high frequency pulse is momentarily output from the Nant gate 8 and the flip-flop 1° is set. With this, the Q output of the 7rip 70rub 1° becomes high level, a high level signal is transmitted to the driver 11, and the display 5 is lit to indicate that it is in the self-timer mode.

Kono high level Q output is the sequence controller 12
is also input, and the photographing sequence is set to cell 7 timer mode. If the shutter release operation of the camera is performed in this state, this will be self-timer mode photography, and the shutter release operation will be performed after a certain time delay after the release button 2A is depressed. After completing a series of photo shooting sequences, the END signal becomes high level from 12 onwards.
7 lip-flop 1° is reset and the self-timer mode is canceled.

In particular, in this configuration, by configuring the circuit with 0MO8 and configuring the display with a low power consumption element such as a liquid crystal, it is possible to keep the circuit energized at all times or for a certain period of time,
Like conventional systems of the same type, power-on timing and
It is possible to realize a self-timer device that is not limited by the timing of setting the self-timer.

In the above embodiment, once the self-timer mode is set, a reset switch (not shown) is used in addition to the set switch 4 to arbitrarily reset the self-timer mode.
1 from 12 to the reset input of R flip-flop 10.
It is necessary to perform a logical sum with the eND signal and input the result. The embodiment shown in FIG. 3 realizes this with one switch (4 in the figure). By using a D-type flip-flop 13 in place of the SB flip-flop 10 in FIG. performs a toggle action. That is, first, when the switch 4 contacts the switch button by pressing the switch button with the fingertip, the switch 4 contacts the contact point 1 again by releasing the fingertip from the switch button.

As a result, one positive pulse is output from the gate 8, the Q output of the flip-flop becomes high level, and the self-timer mode is set. Next, when the switch button is pressed again to drive switch 4, one positive pulse is similarly output from gate 8, the flip-flop is inverted, the Q output becomes low level, and the self-timer mode is activated. be done. The other operations are the same as those described in FIG. 2 and will therefore be omitted.

Figure 2 1. The circuit shown in Fig. 3 makes it easy to implement the above-mentioned functions by equipping modern microprocessors with such features, all under the control of microprogramming. Needless to say.

In addition, in the penalty embodiment, the self-mode display 5 can be made to blink during the self-timer operation so that it can also be used as a self-timer operation display, or can also be used as an information display for other cameras, such as a shutter seconds display. is easy.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a camera to which a self-timer device according to the present invention is applied, FIG. 2 is a circuit diagram showing an embodiment of the self-timer device according to the present invention, and FIG. FIG. 7 is a circuit diagram showing another practical example of the timer device. 1: Camera body, 2; Shutter release button, 3
'm-eye MS, 4' Self-timer mode set switch, 5: Self-mode display switch, 8-9: NAND gate, 10: Set-reset type flip-flop 11: Display drive circuit 12: Camera sequence), Control circuit 7' a
Tsuku 13: D type flip-flop. 3 n

Claims (1)

[Claims] A storage means is provided for storing the self-timer mode, which is set by a set trigger signal generated when the self-timer mode is selected, and the self-timer mode control is performed by the output signal of the storage means, and the self-timer mode control is completed. 1. A self-timer device characterized in that self-timer mode selection is canceled by resetting a memory means using a signal generated when the self-timer mode is selected.