JPS604882A - Time elapse sounding apparatus - Google Patents

Abstract

PURPOSE:To obtain an accurate exposure time by facilitating the determining of time elapse in a dark place, by successively generating different sounds with the elapse of time to be used in long-time exposure photographing and the like. CONSTITUTION:When a bulb photographing mode is indicated by a switch 13 and a release input switch 12 is operated, time detecting means 25-27 are started and pulses P1, P10, P60 are respectively generated with the elapse of time to be supplied to a sounding means 30. The sounding means 30 generates pulses (c), (e), (g) respectively different in lengths at every 1sec, 10sec and 60sec on the basis of pulses corresponding to the elapse of time to operate gates 35-37, 40- 42 and a buzzer sound having a corresponding time length is generated by a sound generator 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a time lapse sounding device that is applied to cameras and the like and notifies the passage of time during long exposure photography etc. with sound.

[Technical background of the invention and its four issues]

In long-time exposure photography (hereinafter referred to as bulb photography) with a camera, the photographer continues to press the shutter release button of the camera, and after a predetermined amount of time has elapsed, the photographer releases the release button to complete the exposure. In this case, the photographer must measure the bulb photography time using a clock, stopwatch, or the like. However, bulb photography is generally applied when a relatively long exposure time of 10 seconds or more is required, and the external brightness of the subject and camera is extremely low, so it must be performed in a dark place.

For this reason, the projector had to use a portable lighting device or the like to observe the clock in the middle of the photo shoot, which placed a great deal of effort on the part of the photographer.

[Purpose of the invention]

The purpose of the present invention is to provide a time elapse sounding device that can easily tell the passage of time even in a dark place by notifying the passage of one hour with a sound, and that can greatly reduce the labor of the photographer during bulb photography, etc. It is about providing.

[Summary of the invention]

The time elapsed sound generation device according to the present invention includes a plurality of time detection means that are activated by a start signal and produce an output each time a mutually different set time elapses, and operates each time an output signal is received from each of these time detection means. The device is equipped with a sounding device that produces mutually distinguishable sounds for each output signal of each time detection means, and as time elapses, different sounds are sequentially emitted, and the sound indicates the passage of time. be.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to an embodiment shown in the drawings.

In Figure 1, ■ is an oscillation circuit, which is used as the control center for the electronic circuit built into the camera, and creates various timings such as the shutter time, which will be described later. (13 is a release input switch, which outputs a signal to start the photographing operation when operated by the user.

(131 is a mode input switch, which operates to select a shooting mode such as AE shooting, manual shooting, bulb shooting, etc. by the user's operation. 041 is a shutter control circuit;
It is operated by a signal from the release input switch (121) and operates the electric shutter according to the shooting mode selected by the mode input switch u3. That is, in the case of the AE shooting mode.

The shutter time set by the output from the AE circuit (not shown), the shutter time set by the user in manual shooting mode, and the signal from the release input switch side in bulb shooting mode are generated. While they are there, open the electric shutters.

The above-mentioned shutter time is controlled based on an oscillation signal of a predetermined frequency generated from the oscillation circuit 1. (+61
is a trigger switch that detects the opening operation of the shutter and outputs a signal. (171 is a start circuit which generates a start stone number (a) shown in Figure 2 for starting the time elapsed sound generation device of the present invention. This start signal (
The timing at which α) occurs is the trigger switch +161
This is when the opening of the shutter is detected by the signal from the

(tl 4'1 frequency divider circuit divides the output of the oscillation circuit l1l), and divides the output of the oscillation circuit l1l to be described later.
The signal shown in Figure 2, which is the basic oscillation frequency of I, is generated. This buzzer is used for self-timer display and general warnings such as overexposure and underexposure.

The frequency-divided signal (power) is also applied to the self-circuit c!v and warning circuit (221) that control these.

(c) is a frequency dividing circuit which is operated by the start signal (al) and further divides the frequency of the frequency-divided signal (4) to 1(
Hz) to create a pulse (P, ). (c) is a 1/1o counter, input the pulse (P, ) of 1 (H2) above,
Pulse CP with a period of 10 seconds. )make. (1/6 in 2
Input the above 10 second periodic pulse on the counter.

Create a pulse (P6°) with a period of 60 seconds. That is, 9 minutes (
C) Circuit (2!51 is every second, 1/10 counter is 1
176 counter 4 for every 0 seconds is a time detection means for every 60 seconds.

Next, we will explain the sound generation means that generates a distinguishable sound at each elapsed time based on the signal from the time detection means (2e (271).Ca1l C'121 C331
are each one-shot multi, and the pulse (Pl)
Enter the corresponding (Plo) (P2O) and
As shown in the figure (pulse outputs (c) with different time widths)
(gl (y). These pulse outputs (C)
(e) The time width of (y) is set as (C<g<g).

These pulse outputs (C1 (gl (!Il) are the buzzer ■
This determines the pronunciation time, and depending on the difference in pronunciation time, it is determined whether the pronunciation is every 1 second, every 10 seconds, or every 60 seconds.

G51 G361 C71 are AND circuits, which are provided corresponding to the one-shot multi θn t321C331, and their pulse outputs (C) tel (y
) and the frequency-divided signal (/') are input. Then, as shown in Fig. 2, the pulse output (C1(Ql(y)) generates the sounding signal (d-)σ) (A) with a time width determined by (y).

C31 has 70 flips and 176 counters (
The output is inverted by inputting the pulse (P6o) generated from 27+. f40 is an AND circuit which inputs the output of the above flip-flop and the sound generation signal (d) generated from the AND circuit C351, and produces an output ti).

0Il is an OR circuit which inputs the output (i) and the sound generation signal σ)(A) generated from the AND circuit (to) I3n, and outputs a signal U> based on their logical sum.

(421 is a gate circuit and the above signal σ is used as one sounding signal)
and the self-circuit C! Jl, inputs the signal from the warning circuit and selects the sounding signal according to the shooting mode specified by the mode input switch (131);
Output to the driver circuit 143 of the buzzer ■. That is,
If the bulb photography mode is selected, signal 0) is selected and output.

(44 is a reset circuit when the power is turned off, and the 1/1o counter □□□, 1
/6 counter-punishment and flip 70 knob C3G are reset respectively.

Next, the operation will be explained with reference to the time chart shown in Figure 2. First, the bulb photography mode is designated by the mode input switch Q31. Next, the release input switch α2 is operated. This operation causes the shutter control circuit (141) to operate and open the shutter.

When the shutter is opened, a signal from the trigger switch αe causes the start circuit a71 to send a start signal (α
) and activates each time detection means prisoner.

Therefore, the time detection means (2) generates a pulse (P,
) is output. This pulse (P, ) becomes a pulse output (c) with a predetermined time width by a one-shot multi C31), and is further combined with the basic oscillation frequency signal (machi) of the buzzer (A) by an AND circuit C35+ to produce a sounding signal (d). At this time, the output of the flip 70 Tsubuta is ++1'' in the initial state, and the above sounding signal (d) passes through the AND circuit (40) and is output as a signal (i), and is further output from the OR circuit (41). ) and is outputted as a signal 0).Then, it is outputted from the gate circuit \?5 (4'lJ) to the driver circuit C3, causing the buzzer ■ to sound at the predetermined time interval.

This operation is performed every second when a pulse (P, ) is generated, and the time elapsed every second is announced by sounding the buzzer ■.

In this way, when 10 seconds have passed since the start, a pulse (P, .) is generated from the time detection means r261.

This pulse (P,.) is one shot multi C32rc
Therefore, a pulse output t-) having a time width longer than the time width due to the one-second pulse (P,) is obtained, which is further combined with a signal (sounding signal σ). MO and OR circuit (4
After passing through υ and being output as a signal 0゛), the gate circuit (
The output from 421 to the driver circuit (43) causes the buzzer ■ to sound for a time longer than the sounding time of each second. This operation is performed every 10 seconds when a pulse (P, .) occurs, and the buzzer (
21 is pronounced to announce the passage of time every 10 seconds.

Of course, during this time, the above-described sounding is performed every second, but they can be distinguished from each other by the difference in the duration of one sounding.

When 60 seconds have elapsed from the start, a pulse (P6o) is generated from the time detection means (2). This no(Russ(P6゜)
is a one-shot multi (c), which results in a pulse output (!i) with a longer time width than the time width of the pulse (P, .) every 10 seconds, and is further combined with a signal (force) to generate a sound signal (gradient). Then, after passing through the OR circuit (41) and outputting it as a signal 0], it is output from the gate circuit (4z) to the driver circuit (c), and the buzzer (21) sounds for a longer time than the sounding time every 10 seconds. and announces that 60 seconds have passed.

The above pulse (P6.) is also applied to the flip 70 knob G9 and inverted to its output 101t.

Therefore, from now on, the AND circuit (4) becomes non-conductive.

The buzzer ■ does not sound every second. Namely.

After 60 seconds have elapsed from the start, the buzzer does not issue a notification every second, but instead makes a notification every 10 seconds. Due to the irregularity of the reciprocity law, fine-grained exposure time control in 1-second increments is meaningless, and to avoid confusion over the passage of time, it is better to emit sounds at 10-second intervals after 60 seconds have elapsed. It's for a reason.

In the above embodiment, the time detection means 1251 CGI@ and the sound generation means (2) are constructed by combining a frequency dividing circuit, a counter, a one-shot multi, an AND circuit, and the like.

Instead of these, a microcomputer may be used and each of the above means may be executed by a program.

An example of a program in this case will be explained using a contradictory diagram.

First, the user selects the bulb photographing mode and inputs a signal associated with turning on the switch (step 2). Next, initial settings are made for each counter for 1 second, 10 seconds, and 60 seconds (step 2). Next, it is determined whether or not it is within 60 seconds from the start (step ■), and if YES, it is determined whether or not 1 second has elapsed (step ■), and the process is repeated silently until 1 second has elapsed. . Then, when 1 second has elapsed, a preset sound signal for 1 second is output (
Step ■). Next, it is determined whether 10 seconds have elapsed (step ■). If 10 seconds have not yet elapsed, repeat steps ■~■ until 10 seconds have elapsed.

Announcements are made by pronunciation every second. Then, when 10 seconds have elapsed, a preset rs sounding signal for 10 seconds is output (step 2). 1iK It is determined whether or not 60 seconds have elapsed (step 2), and if 60 seconds have not yet elapsed, steps 2 to 2 are repeated until 60 seconds have elapsed, and a notification is made by sounding every 1 second and every 10 seconds. Then, when 60 seconds have passed, the preset sound signal for 60 seconds will be output (Step ■)
, announces the passage of 60 seconds by sound. Also, a flag indicating that 60 seconds have passed is set, and the process returns to step (2). Then, based on the judgment in step ■, the process jumps to step ■.

That is, after 60 seconds have elapsed, step ■■ is skipped and notification is not made every second, but notification is made by sounding every 10 seconds after step ■.

Here, the distinction between sounding every 1 second, 10 seconds, and 60 seconds can be achieved by changing the sounding time as in the embodiment described above, or by presetting sounding signals with different tones.

Although the above embodiments have all been described as being applied to bulb photography of a camera, they can also be applied to an extension timer used during film development.

〔Effect of the invention〕

As described above, according to the present invention, a sound is used to notify when the time is running out, so when applied to a camera, there is no need to visually check a clock or stopwatch in a dark place when taking bulb shots. It is possible to greatly reduce the labor of the operator and obtain accurate exposure time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the time-lapse sound generation device according to the present invention. FIG. 1 is a time chart explaining the operation of the apparatus shown in FIG. ■・Sound generator, G4 (2)・Time detection means, ■−・Sound generation means.

Claims (1)

[Claims] (1) A plurality of time detection means that are activated by a start signal and produce an output each time different set times pass, and an output of each time detection means that operates each time it receives an output signal from each of these time detection means. 1. A time elapsed sound generation device comprising a sound generation means for producing mutually distinguishable sounds for each signal.