JPS62109034A - Camera - Google Patents

Abstract

PURPOSE:To prevent malfunction by the consumption of a battery by providing operation control means for alternately operating a light emitting means and sound generating means. CONSTITUTION:An AND gate 31 outputs a high level signal (reset signal RES) at the point of the time when all the self-timer operation sequence is completed. An AND gate 32 outputs a high level signal during the operation of the self- timer. An AND gate 33 is an AND gate for sounding a buzzer 34 and turns on and off a transistor 36 via a resistor 35 to sound and silence the buzzer 34 at intervals of every 1/2sec in 1Hz period during the operation of the self- timer. An AND gate 37 turns on and off a transistor 40 via a resistor 39 to flicker a light emitting diode 38 at intervals of every 1/2sec in -1Hz period during the operation of the self-timer. NAND gates 41, 42 output the high level signal from the NAND gate 41 during the operation of the self-timer and output the low level signal when the operation stops.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to an improvement in a camera that can notify a user that a self-timer is in operation, for example, by both a light emitting means and a sounding means.

(Background of the Invention) Conventionally, in order to notify the user that the self-timer is in operation, for example, a device is equipped with both a light emitting means such as a light emitting diode or a lamp and a sounding means such as a buzzer or a piezoelectric element. There are cameras that create two states, one in which both are performed at the same time, and one in which both are not performed, and the state is repeated. However, in such a camera, if a high-intensity light emitting diode with large current consumption is used as a light emitting means and a buzzer with large current consumption is used as a sounding means, a large amount of current is consumed at the same time, so a common power source is used. There was a problem in that large voltage fluctuations occurred in the power supply voltage, causing various circuits within the camera, especially the CPU (central processing circuit), to malfunction, especially when the power supply battery was about to run out. .

(Objectives of the invention) The objects of the invention are 1. It is an object of the present invention to provide a camera that solves the above-mentioned problems and can prevent malfunctions even when the battery is about to run out.

(Characteristics of the Invention) In order to achieve the above object, the present invention includes an operation control means for alternately operating the light emitting means and the sounding means.
a state in which the light emitting means emits light and the sound generating means does not produce sound;
The present invention is characterized in that a state in which the light emitting means does not emit light and the sound generating means generates sound is alternately repeated, thereby enabling stable power supply even when the power supply voltage level is low.

(Embodiments of the Invention) Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a circuit diagram showing an embodiment of the present invention. 1 is C
- An oscillation circuit consisting of a MOS inverter 2, a resistor 3, a feedback resistor 4, a capacitor 5, and a crystal oscillator 6. The oscillation frequency is the frequency of the crystal oscillator 4 (32K
Hz). 7 is a buffer, and 8 to 10 are D flip-flops that generate a frequency (4KHz) for smoothing the buzzer, which will be described later.When a low level signal is input to the clear input terminal CLK, the output of the output terminal Q becomes a low level signal. , the output of the output terminal Q becomes a high level signal. Numerals 11 to 22, together with the D flip-flops 8 to 10, have frequencies (IHz, IH
z), and the signal lines a,
It is output via b. 23 to 26 are D flip-flops similar to the above-mentioned D flip-flops 8 to 22 that count one hour of the self-timer, and 27 is a D-flip-flop that is connected to the self-timer after a predetermined time (11 seconds in this embodiment) has elapsed after the self-timer starts operating. 30 is a so-called shirt release electromagnet which is energized to open the shutter when the transistor 29 is turned on; 31 is a self-timer operation sequence; An AND gate 32 outputs a high level signal (reset signal RES) when all operations are completed, and an AND gate 32 outputs a high level signal during the self-timer operation period.

33 is an AND gate for making the buzzer 34 sound,
During the self-timer operation, the transistor 36 is turned on and off via the resistor 35, and the buzzer 34 is turned on and off at intervals of 1/2 second at an IHz cycle. Buzzer 3
4 is generated by adding a 4KHz signal. 37 is an AND gate for causing the light emitting diode 38 to emit light;
During the self-timer operation, the transistor 40 is turned on and off via the resistor 39, and the light emitting diode 38 is blinked at intervals of 1/2 second in the Rolo cycle.

41 and 42 are Nant gates that constitute the RS flip-flop, and during the self-timer operation, a high level signal is sent from the Nant gate 41, and when the self-timer is finished, a low level signal is sent from the Nant gate 41.
Each is output. 43 is a switch for operating the self-timer, 44 is a battery that serves as a common power source for the buzzer 34 and the light emitting diode 38, and 45 is the main switch of the camera, and when this switch is turned on, the voltage that becomes the power source for each circuit is At the same time that Vcc is generated, an initialization signal PUC is generated in the initialization signal generation circuit 46. 47 is a NOR gate which outputs a low level signal to the Nant gate 42 when the reset signal RES and initialization signal PUC are input.

Next, when the main switch 45 of the camera, whose operation will be explained with reference to FIG. 2, is pressed and the initialization signal PUC is generated in the initialization signal generation circuit 46, the output of the NOR gate 47 becomes a low level signal. Therefore, since the switch 43 is off, the output of the Nant gate 41 becomes a low level signal, and all the D flip-flops 8 to 26 do not operate.On the other hand, the oscillation circuit 1 does not operate in response to the generation of the voltage Vcc. Start, ie, start oscillating 32KHz.

Next, when the switch 43 is turned on to start the self-tire operation, the output of the Nantes gate 41 is inverted to a high level signal (see FIG. 2), and the signal is p
Since the signal is input to the input terminals CL and H of the flip-flops 8 to 26, the D flip-flops 8 to 26 start operating. In other words, each of the D flip-flops 8 to 26 begins to operate as a counter that divides the input frequency by 1/2. To explain in more detail, D flip-flop 8~
10, 4KHz (32K
Hz is divided into 1/8), and D flip-props 12 to 22 generate π7.IHz, which is used to make the light emitting diode blink every 3 days.Here, an asynchronous counter is used. This is because we only wanted to generate 4KHz and IHz as audible sounds for the buzzer 34, and if the intermediate output signal is to be used for creating timing for other circuits, the D flip-flops 8 to 22 It is better to use a synchronous counter.Also, D
The flip-flops 23 to 26 divide lHz into 1/16, and the time since the self-timer started is detected here.

As mentioned above, when the switch 43 is turned on and the self-timer starts, the output terminal Q of the D flip-flop 22
A signal of IHz is output from the output terminal Q, and a signal of 1Hz, which is the inverted signal, is output from the output terminal Q (see Fig. 2).
Each signal is sent to an AND gate 33 via signal lines a and b.
．． 37 and is used as a signal to turn on and off transistors 36 and 40. That is, the IHz signal is used as an ON signal for the buzzer 34, and the IHz signal is used as an ON signal for the light emitting diode 38. Therefore, the buzzer 34 and the light emitting diode 38 do not operate at the same time, and the sound and light emission are alternately repeated as an indication that the self-timer is currently operating (see FIG. 2). This state continues for about 11 seconds.

After 11 seconds have passed since the self-timer started, at the 12th second, D flip-flop 7'25.26
Each output of the output terminal becomes a low level signal, and accordingly, the outputs of the OR gate 32 and AND gates 33 and 34 become a low level signal, so the operation of the buzzer 34 and the light emitting diode 38 is stopped. At this time, D
Since the output terminals Q of the flip-flops 23 and 24 and the output terminals Q of the D flip-flops 25 and 26 are both high-level signals, the output of the AND gate 27 is a high-level signal, and therefore the resistor 28 is Through this, the transistor 29 is turned on, the electromagnet 30 is excited, and a shutter (not shown) is opened.

When it becomes 13 seconds 1, D flip-flop 23, 25.2
Since each output of the output terminal Q of the D flip-flop 24 becomes a high level signal, the output of the AND gate 31 becomes a high level signal (reset signal RES). Become. Therefore, the output of the OR gate 47 becomes a low level signal, and the output of the OR gate 47 becomes a low level signal.
Since the output of D flip-flop 1 also becomes a low level signal, all D flip-flops 8 to 26 stop operating. At this point, all operations as a self-timer are completed.

According to this embodiment, the buzzer 34 that indicates when the self-timer is operating and the light emitting diode 38 are made to sound and emit light alternately instead of simultaneously, so that the current consumption is equalized and the power supply voltage is reduced. Even when the camera is in use, a stable power supply can be provided, albeit at a low voltage level, and circuits such as the CPU disposed inside the camera will not malfunction.

(Correspondence between the invention and the embodiment) In this embodiment, the signal lines a and b and the AND gates 27 and 31 serve as the operation control means of the present invention.

The batteries 44 correspond to a common battery.

(Modification) In this embodiment, a case has been described in which a display indicating that the self-timer is in operation is displayed, but the display is not limited to this. For example, the display may display a warning that the film is stretched or the subject brightness is low. The present invention can also be applied to a type of camera in which the user is informed of the information by both a light emitting means and a sounding means. Furthermore, although 32 KHz was used as the oscillation frequency, it is not limited to this. Furthermore, the frequency of 4KHz for making the buzzer 34 sound is 2KHz to 5KH.
There is no problem if it is around z.Furthermore, although the duty ratio of IHz, which is the ON signal for the buzzer 34, and IHz, which is the ON signal for the light emitting diode 38, is set to 50%, it may be other than this.

In addition, although the self-timer operation time was set to 11 seconds, it may be other than this, or it may be possible to select from several stages.Furthermore, to cancel the self-timer operation midway, press the main switch 45 again. Turn on the initialization signal P
It is sufficient to generate UC, but a switch for this purpose may be provided.

(Effects of the Invention) As explained above, according to the present invention, the operation control means for alternately operating the light emitting means and the sounding means is provided.
a state in which the light emitting means emits light and the sound generating means does not produce sound;
The light-emitting means does not emit light and the sound-producing means produces sound, which are alternately repeated to ensure stable power supply even when the power supply voltage level is low, so when the battery is about to run out, Even if this happens, malfunctions will not occur.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a timing chart thereof. l...Oscillation circuit, 8-26...D flip-flop, 33...AND gate, 34...
...Buzzer, 36...Transistor, 3
7...AND gate, 3rd...Light emitting diode, 40...Transistor, 41.42
...Nant Gate, 43...Switch, 44...Battery, 45...Main switch.

Claims (1)

[Claims] 1. In a camera equipped with a light emitting means and a sounding means for emitting light and emitting sound to inform the outside of the operating state of the camera at that time, and a battery serving as a common power source for the light emitting means and the sounding means, 1. A camera comprising operation control means for alternately operating the sound generating means and the sound generating means.