JPS5824766B2 - The most important thing is the most important thing. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a light control electronic light emitting device that provides an insufficient amount of emitted light to the photographer when the distance to the subject is too far or when there is too little charge remaining in the main capacitor. It relates to a device that warns of certain things.

- Dimmable electronic light emitters are effective because the amount of emitted light is automatically adjusted according to the distance to the subject.

However, on the other hand, there is one drawback.

Naturally, if the subject is too far away, the amount of light will be insufficient, but unlike in the case of general electronic light emitters, calculations using guide numbers are not performed in advance, so there is no way to know that there is a shortage.

Therefore, it has the drawback that the amount of light is insufficient and photographing fails.

In addition, in series type dimming electronic light emitters, from the main capacitor,
It has the advantage of being able to take pictures continuously because it extracts only the required stored energy and emits light.

However, after taking several shots, the final shot will naturally be underexposed, resulting in failure of the shot.

In order to eliminate the above-mentioned drawbacks, there is a device that sounds a buzzer only when the light has been adjusted completely, or lights a lamp within the field of view of the camera viewfinder to warn you that too much light has been exposed. Already proposed.

However, such means have the following drawbacks and are not practical.

In other words, an alarm that sounds a buzzer each time a photograph is successfully taken (flash adjustment is completed), but does not sound only in the event of a failure, is often overlooked due to human psychological effects and is ineffective. There are few drawbacks.

Especially when taking pictures, the shutter opportunity is important, so the chance of missing even one shot is a major drawback.

The psychological effects explained above can also be understood by explaining them like grammar.

That is, for example, when many lamps are lit in succession at the same pitch on a dark night, we often neglect to discover that one of them has gone out. This is because having a light on is thought to have a similar psychological effect to not overlooking it.

In particular, the phenomenon of underexposure occurs inadvertently and with extremely low frequency.

Therefore, the above-mentioned drawback can be eliminated by issuing a warning using a buzzer only when dimming is not performed.

Furthermore, if a light emitting diode or neon tube is used for warning purposes, it is necessary to check whether or not the light is emitting light every time a photograph is taken.

However, such operations are complicated, and there are many chances of forgetting them carelessly, so it is not a suitable device based on the above-mentioned theory.

In other words, it is not a very effective device from a practical point of view.

Therefore, it is necessary to use a sounding device such as a buzzer to issue a warning sound.

Such devices are generally large and expensive, and it is difficult to economically install them in a limited space.

The present invention is characterized by eliminating all of the above-mentioned drawbacks and inconveniences, and will now be described in detail with reference to embodiments.

FIG. 1 shows an electrical circuit of a so-called series-type dimming electronic light emitter, where symbol 1 is a DC power supply and a main capacitor 2 stores luminous energy.

The resistor 3-1, 3-2, 3-3, capacitor 4, synchro switch 5, and trigger transformer 6 are well-known trigger devices, and by closing the synchro switch 5, a high voltage is applied to the trigger electrode 7-1. As a result, the light emitting discharge tube 7 starts emitting light.

Also, at this time, a gate pulse of 5CR (controlled rectifying element) 8 is obtained and it becomes conductive.

When light is projected onto the object, the reflected light is integrated, and when a required value is reached, an electric pulse obtained from the light amount integration circuit 11 is input to the gate of 5CR9.

Therefore, it is ignited and the 5CR8
, is extinguished, the emitted light is cut off midway, and the configuration is such that photography with proper exposure can be automatically performed.

The electric circuit shown in FIG. 2 is an electric circuit for reporting insufficient light quantity, and terminals 16 and 16a are connected to the positive and negative terminals of the power source 1.

This voltage is applied via a diode 17 and a capacitor 18 to a commutation circuit made of 5CR20.21.

Terminals 13a, 14a and 15a are connected to terminals 13, 14 and 15 in FIG. 1, respectively.

Considering the case where the subject is far away and the amount of light is insufficient, the output pulse of the terminal 13 is input to the terminal 13a in FIG. The configuration is such that a positive voltage signal can be obtained from the terminal 21a since the 5CR21 is ignited and extinguished.

As will be described later, the output from the terminal 21a causes a buzzer device (shown in the fifth figure) 37 to sound to warn of insufficient light quantity.

If the amount of light is sufficient, the output pulse of the light amount integrating circuit 11 is input to the gate of the 5CR 21 via the terminals 14 and 14a at the same time as the required amount of light is projected and the light is cut off.

Therefore, since commutation is performed via the capacitor 22, the arc of the 5CR 20 is extinguished, and the buzzer device 37 shown in FIG. 5 stops generating the buzzer sound.

Since the time during this period is less than 171,000 seconds, the generated sound is almost indiscernible.

Furthermore, the generated sound can be extinguished by activating the buzzer device 37 via a short-time delay circuit.

However, when light intensity is insufficient and flash adjustment is not performed, there is no output pulse from the light intensity integration circuit 11, so the 5CR20 remains lit, and the buzzer continues to sound. This has the effect of allowing you to easily notice what happened and prepare for the next shoot.

After underexposed photography, the main capacitor 2 in FIG. 1 continues to charge, and when the neon tube 12 lights up, an electric pulse is obtained from the terminal 15.

This electric pulse is manually applied from the terminal 15a in FIG.
Since the CR 21 is ignited, the warning sound of the buzzer device 37 is automatically extinguished, and at the same time, it is possible to notify that the next photographing can be started.

That is, it has the effect of being able to notify the completion of charging of the main capacitor 2 at the same time.

Even if the subject is close, if you take several shots in succession,
The final shot will always have insufficient light.

In this case as well, the same effect can be achieved since a warning is provided by the buzzer device as in the case where the subject is too far away.

5CR20 and 21 in Figure 2 become a seesaw circuit, and 5CR
There are two stable points of ignition for R20 and R21, respectively.

A transistor circuit for the same purpose is shown in FIG.

Components with the same symbols as those in FIG. 2 are the same members, so their explanation will be omitted.

When the power is turned on, either transistor 23 or 24 becomes conductive.

If the transistor 24 becomes conductive, the base voltage of the transistor 23 drops through the capacitor 25 and is kept non-conductive.

Also, when the transistor 23 becomes conductive when the power is turned on,
Transistor 24 becomes non-conductive.

However, when the charging current of the capacitor 25 disappears, the transistor 23 becomes non-conductive, so that the base voltage of the transistor 24 rises and becomes conductive.

Therefore, after a predetermined period of time, the transistor 24 is turned on and +)PI/ is applied.

As in the previous embodiment, when light emission starts, a positive pulse is input from the terminal 13b, so the transistor 23 becomes conductive.

Therefore, the base voltage of transistor 24 drops and becomes non-conductive.

Therefore, the output of terminal 21b is obtained.

As will be described later, the output of this terminal is input to the terminal 34a in FIG. 5 and makes the transistor 34, which is a switching semiconductor element, conductive, so that the buzzer device 37 starts to operate. The output pulse of the light amount integrating circuit 11 is inputted through the terminal 14b to turn on the transistor 24.

Therefore, the capacitor 25 is discharged via the diode 26, and the base current of the transistor 23 disappears and becomes non-conductive, so that the operation of the buzzer device 37 is instantaneously stopped.

However, when the subject is far away and the amount of light is insufficient, terminal 14b
Since there is no input via the buzzer device 37, the buzzer device 37 continues to operate, providing an effective means as a warning device.

Thus, upon completion of charging the capacitor 25, the transistor 23 becomes non-conductive, and the transistor 24 becomes conductive, discharging through the diode 26 and preparing for the next operation.

The buzzer device 37 also stops energizing and becomes inactive.

The time for issuing the alarm can be arbitrarily set by changing the time constant including the capacitor 25.

As can be seen from the above explanation, the circuits in Figures 2 and 3 are
It constitutes a flip-flop circuit and serves as a memory circuit.

Next, FIG. 4 shows a parallel dimming electronic light emitter to which a warning device (FIGS. 2 and 3) is connected.

Components with the same symbols as those in FIG. 1 are the same members, so a description thereof will be omitted.

Since the output pulse of the light amount integrating circuit 11 is manually applied to the gate of 5CR27 and ignited, 5CR27 is ignited at the same time as proper exposure is completed, short-circuiting the remaining luminous energy of the main capacitor 2. The structure is such that the light emission is cut off when it wears out.

In such a case, the terminals 13, 14 and 15 are replaced with the terminals 13a, 14a, 15a in FIG. 2 or the terminal 13b in FIG.
, 14b, it is possible to obtain exactly the same effect as in the previous embodiment.

Next, the fifth point regarding the buzzer device, which is one of the gist of the present invention.
, 6 will be explained using FIG.

FIG. 5 shows details 2 of the DC power supply 1 of FIG. 1, which is an oscillating booster circuit including a battery 33, a transformer 28, and a transistor 31.

This becomes a Bartley oscillation circuit, and the resistors 32-1 and 32-2 provide a bias voltage to the transistor 31.

The coil 28a serves both as a primary coil and an oscillation coil.

Coil 28b is an induction coil, and its output controls the base of transistor 31.

A high voltage alternating current is generated in the secondary coil 28c, and the diode 2
9 and higher voltage (35
The main capacitor 2 shown in FIG. 1 is charged by obtaining a voltage of about 0 volts.

The buzzer device 37 is of a special construction as shown in FIG. 6a.

That is, the periphery of a circular diaphragm 36 (made of thin iron) is fixed inside the casing 35 of the light emitter.

Opposed to this diaphragm 36 is a U-shaped magnetic core (made of ferrite).
37b is fixed.

When an alternating current is applied to the excitation coil 37a, the excitation coil 37a becomes a sounding element that vibrates and produces sound due to the magnetic attraction force.

The housing 35 has holes 35a, 35bt...
- is installed to allow sound to go outside.

Due to the above configuration, the diaphragm 36 can be made relatively large even in a limited space, and the efficiency of sound generation can be increased.

It is also economical.

Since the excitation coil 37a is connected in series with the transistor 34 shown in FIG. 5, sound is generated only when the transistor 34 is conductive.

As mentioned above, the terminal 21a in FIGS. 2 and 3 is
Since the outputs of 21b and 21b are inputted, the transistor 34 becomes conductive and the buzzer device 37 sounds only when dimming is not performed, thereby achieving the object of the present invention.

Since the output of the oscillation coil 28a is used as the power source for the buzzer device 37, there is no need to add a special oscillation circuit.
It also has the characteristic that a sufficiently large output can be obtained.

Therefore, the warning device can be installed in a limited space by an economical means.

Instead of obtaining the same AC output from the oscillation coil 28a, it can also be obtained from a separately provided secondary coil.

Next, FIG. 6 shows a case where a piezoelectric element is used to make the sound generating element smaller and lighter.

In FIG. 6, the housing 35 is provided with a hole 42,
A piezoelectric element 39 is adhered and held on the container 40 facing the hole 42 .

Electrodes are provided on the front and back surfaces of the piezoelectric element 39, from which lead wires 41-1 and 41-2 are led out.

Leading wires 41-1 and 41-2 are connected to terminals 38a and 38b in FIG. 5.

Although almost no current flows through piezoelectric elements, a relatively high voltage is required.

For this purpose, the voltage for operation can be obtained by leading out the terminal 38a from the required voltage portion of the secondary coil 28c of the transformer 28.

Transistor 43 and its base terminal 43 in FIG.
Terminal a performs exactly the same operation as the transistor 34 and base terminal 34a, and terminal 43a is connected to terminal 21a or terminal 21b in FIGS. 2 and 3.

The objects of the invention are thus achieved. As can be seen from the above description, the apparatus of the present invention achieves the object stated at the beginning and is highly effective.

[Brief explanation of the drawing]

Figure 1 is an electric circuit diagram of a series type dimming electronic light emitter, Figures 2 and 3 are electric circuit diagrams of a warning device, Figure 4 is an electric circuit diagram of a parallel type dimming electronic light emitter, FIG. 5 shows a control circuit for sounding the buzzer device, and FIG. 6 shows an explanatory diagram of the sounding element. 1...DC power supply, 2...Main capacitor, 3-1°) 3-2, 3-3, 4, 5, 6, 7-1.
... Trigger device, 7 ... Discharge tube for light emission, 12 ... Neon tube, 8, 9, 20, 21.
・・・・・・5CR111・・・・Light amount integration circuit, 1
0,22... Commutation capacitor, 28...
...Trans, 28a>28bt28c...1
Coil, 23, 24, 31. 34, 43...Transistor, 33...Battery, 37...
・Sounding element (buzzer device), 30-1.30-2...
...High voltage terminal, 35. ...Housing, 35a>
35 b t”..., 42...vacancy, 37b
...Magnetic core, 37a... Excitation coil;
36... Vibration plate, 39... Piezoelectric element,
40... Container.

Claims (1)

[Claims] 1 A high voltage obtained from an oscillating booster circuit consisting of a transistor photoelectrically charges the main capacitor to accumulate luminous energy, and when the synchro switch closes, it starts emitting light and detects that the required amount of light has been projected onto the subject. In a dimmable electronic light emitter equipped with a light cutting circuit that stops the discharge tube from emitting light via the obtained detection signal, a synchronizing switch is closed to generate a first detection electric signal at the same time as the light emission starts. 1 detection circuit, and a second detection circuit obtained from the above-mentioned detection signal that commands the stop of light emission when dimming is performed.
a second detection circuit that generates a detected electrical signal; a memory circuit that stores the first detected electrical signal obtained from the first detection circuit; and a second detection circuit that stores the first detected electrical signal obtained from the first detection circuit; an electric circuit that is made to disappear by the detected electric signal of 2;
The switching element whose conduction is maintained by the memory signal of the memory circuit, the electrical circuit that applies the AC output of the oscillating booster circuit to the sound generating element via the switching element, and the switching element begin to conduct. 1. A device for warning of an insufficient amount of emitted light from a dimmable electronic light emitter, comprising a control circuit that converts a switching element into a non-conducting state after a predetermined period of time has passed.