JP2575202Y2 - Lighting circuit for lighting - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination light used for photographing a video camera or an illumination light circuit used by a diver for an illuminator illuminating the sea.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a circuit configuration incorporated in a conventional illumination light. The battery power supply 11 is, for example,
A 6V power supply is provided by connecting five 1.2V NiCd batteries in series. A loop circuit including the battery power supply 11, the lamp 12, and the power supply transistor 13 performing a switching operation forms a lamp power supply circuit. The lamp 12 is turned on and off by turning on and off the transistor 13.

When the first control transistor 14 is turned on, the output signal of the supply transistor 13 is input to the base via the resistor 15 and turned on.
Controlled. The first control transistor 14 and the second control transistor 16 form a lighting control circuit. These transistors 14 and 16 are for switching operation. The second control transistor 16 is turned on by inputting a differential pulse from a differential circuit of a capacitor 17 and a resistor 18 connected to its base.
That is, when the operation switch 19 is turned on to the terminal a side,
A differentiated pulse is generated by a power supply current that temporarily passes through the capacitor 17 and the resistor 18, and the second control transistor 16 that receives the differentiated pulse is temporarily turned on. The ON state of the transistor 16 is held by a holding circuit described later. First control transistor 14
Is turned on by inputting a base when the second control transistor 16 is turned on.

[0004] The operation switch 19 is a series switch, which is turned on to a terminal a when one side of the operation section is pressed and to a terminal b when the other side is pressed. When the operation switch 19 is turned on at the terminal a, the first
The second control transistors 14 and 16 are turned on, the power supply transistor 13 is turned on, and the lamp 12 is turned on. When this is input to the terminal b, the holding of the holding circuit described below is released, and the lamp 12 is turned off.

A series circuit of resistors 20 and 21 connected between the collector of the first control transistor 14 and the base of the second control transistor 16 and the resistor 1 of the differentiation circuit
8 form a holding circuit. That is, when the operation switch 19 is turned on to the terminal a, the second control transistor 16 is temporarily turned on, and accordingly, the first control transistor 14 is also temporarily turned on.
A power supply current flows through the resistors 20, 21, and 18, and the divided voltage of these resistors is applied to the base of the second control transistor 16.
And the ON state of the transistor 16 is maintained.

A series circuit of a resistor 22 and a Zener diode 23 connected between the collector of the first control transistor 14 and the negative electrode of the battery power supply 11,
2 and a switching transistor 24 whose base is connected to a connection P of the Zener diode 23 form a voltage level detection circuit. When the voltage of the battery power supply 11 drops to a predetermined level, the detection circuit turns on the switching transistor 24, and the above-described holding circuit (1)
8, 20, 21) are shunted through the emitter resistor 25 to release the ON control of the second control transistor 16.

In the illumination lamp circuit described above, the differential pulse is input to the base of the second control transistor 16 by turning on the operation switch 19 to the terminal a. Is turned on. As a result, the power supply transistor 13 for inputting the output signal of the first control transistor 14 is turned on, and the lamp 12 is turned on.

Further, the first control transistor 14
The holding circuit (18, 20, 21) operates according to N,
The ON state of the second control transistor 16 is maintained. On the other hand, when the first control transistor 14 is turned on, the power supply voltage is applied via the resistor 22 to the Zener diode 2.
As a result, the Zener diode 23 conducts as long as the battery voltage is equal to or higher than a predetermined level. Therefore, no base input signal is generated in the switching transistor 24, and the transistor 24 is turned off.

In such a lighting circuit using a nickel-cadmium battery as the battery power supply 11, the operation switch 19
ON due to forgetting to switch to terminal b (OFF)
If the state continues for a long time, the battery power supply 11 deteriorates due to overdischarge. Further, a large overcurrent flows due to the occurrence of a short-circuit accident or the like, which may lead to code burning or damage to parts.
In such a case, the protection circuit including the detection circuit operates. That is, the voltage level of the battery power supply 11 drops below a predetermined level (for example, 5 V or less for a 6 V power supply) due to overdischarge or overcurrent, and the Zener diode 23 shifts to non-conduction due to this voltage drop. Therefore, the switching transistor 24, which receives a base input by the Zener voltage, is turned on, and the second control transistor 16 by the holding circuit is turned on.
Is released from the ON state. Thus, the second control transistor 16 is turned off, the power supply state is cut off by turning off the first control transistor 14 and turning off the power supply transistor 13, and the lamp 12 is turned off.

When the operation switch 19 is switched to the terminal "b" while the lamp 12 is on, the base of the second control transistor 16 is bypassed by the capacitor 17 to temporarily become zero volt, and this transistor 16 is turned off. ,
Thus, the first control transistor 14 is turned off, the power supply transistor 13 is turned off, and the lamp 12 is turned off.

[0011]

In the above-described conventional lighting circuit, since the operation switch 19 is a switch, the form of the switch is large due to the structure of the switch, and the space is limited. In some cases, it was difficult to incorporate the Further, there is a disadvantage that the operation switch 19 is turned on due to a malfunction when the illumination light hits another object. Therefore, in the present invention, in view of the above-mentioned circumstances, it is necessary to develop an illumination light circuit having a small-sized operation switch that is convenient for incorporation without careless operation, and that it can be turned on and off by electric control. The purpose is to develop a lighting circuit for lighting.

[0012]

In order to achieve the above object, according to the present invention, a power supply line for a battery power supply is connected to a power supply transistor.
A lamp power supply circuit for turning on and off the lamp and closed by a switching operation of the static, Trang for the feeding by the output signal of the control transistor for ON at the input of the lighting signal
A lighting control circuit for ON control register, detects the voltage level of the battery power supply, Trang for said control plans level or higher
And a holding circuit for holding the ON state of the register and releasing the holding at a predetermined level or a drop below the level .
In the lighting light circuit, the lighting control circuit
Temporarily input lighting signal to transistor and turn it on
A two-terminal lighting switch element and the holding circuit
Of the control transistor held in the ON state
Two-terminal configuration that temporarily turns off the input signal and turns it off
And a lighting switch circuit provided with the light- off switch element .

[0013]

When a lighting signal is temporarily input from the lighting switch element , the control transistor is turned on, the ON state is held by the holding circuit, the power supply transistor is controlled to be on, and the lamp is turned on. If the lamp is turned off and overdischarge occurs, or if an overcurrent flows due to a short circuit or the like, the voltage drop of the battery power supply is detected by the holding circuit, and the holding circuit turns on the control transistor .
Release the state hold. For this reason, the control transistor is immediately turned off, the power supply transistor is controlled to be off, and the circuit power supply of the battery power supply is cut off. To turn off the lamp , input the signal to the control transistor by turning off the switch.
The held input signal is temporarily extinguished. Thus, the holding of the ON state of the control transistor is released. Therefore, the control transistor is OFF and the power supply
The transistor turns off and the lamp goes off.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a lighting circuit according to a first embodiment of the present invention. This illumination light circuit is different from the conventional example of FIG. 3 in that the lighting switch 30 is connected between the base of the second control transistor 16 and the positive electrode of the battery power supply 11 via a resistor 26, This is characterized in that a light-off switch 31 is provided between the base of the control transistor 16 and the negative electrode side of the battery power supply 11, and the capacitor 17 of the differentiating circuit is removed.

The lighting switch 30 and the light-off switch 31 are both push switches of a two-terminal configuration , and are automatic return switches that close only when pressed.

In the lighting circuit of this embodiment, when the lighting switch 30 is pressed once, the pulse current is changed to the second level.
The transistor 16 is turned on. Therefore, when the first control transistor 14 is turned on, the holding circuits (18, 20,.
21) operates, the power supply transistor 13 is turned on, and the lamp 12 is turned on.

While the lamp 12 is on, the switch 31 is turned off.
By pressing, the lamp 12 is turned off. In other words, when the light- off switch 31 is closed, the holding voltage ( holding input signal) generated in the resistor 18 disappears, and the second control transistor 16 is turned off. Transistor 13 is OF
F to turn off the lamp 12.

The shut-off operation at the time of overcurrent due to overdischarge of the battery power supply 11 or short-circuit accident which occurs when the operation of the light-off switch 31 is forgotten is the same as in the conventional example.

FIG. 2 shows an illumination light circuit according to a second embodiment. In this embodiment, the first control transistor 1
A series circuit of a Zener diode 32 and a resistor 33 is connected between the collector of the second control transistor 16 and the base of the second control transistor 16.
A base resistor 34, a noise absorbing capacitor 35, and a light-off switch 31 are connected in parallel between the base and the emitter, and the light is turned on between the connection Q between the Zener diode 32 and the resistor 33 and the positive electrode of the battery power supply 11. The configuration is such that the switch 30 is connected.

In the lighting circuit of this embodiment, when the lighting switch 30 is pressed once, the pulse-shaped current is changed to the second current.
, The transistor 16 is turned on. Thus, the power supply transistor 13 is turned on by turning on the first control transistor 14, and the lamp 12 is turned on.

When the voltage of the battery power supply 11 is higher than a predetermined level when the first control transistor 14 is turned on,
Since the Zener diode 32 conducts, a current flows through a holding circuit including the Zener diode 32, the resistor 33, and the base resistor 34, and the second control is performed by a bias voltage generated in the base resistor 34. ON of the use transistor 16 is held.

When the battery power supply 11 is overdischarged or
If an overcurrent flows due to a
Falls below a predetermined level, the Zener diode 32 becomes non-conductive, the bias voltage of the base resistor 34 disappears, and the second control transistor 16 is turned off.
Accordingly, the power supply transistor 13 is turned off by turning off the first control transistor 14, and the power supply to the battery power supply 11 is cut off.

When the light-off switch 31 is pressed while the lamp 12 is on, the bias voltage ( holding voltage) of the base resistor 34 is maintained.
The input signal ) disappears, the second control transistor 16 is turned off, and the lamp 12 is turned off by turning off the first control transistor 14 and turning off the power supply transistor 13. In the case of the second embodiment, a light-off switch 31 may be provided between the collector and the emitter of the second control transistor 16 as shown by a dotted line in the figure.

Although the embodiment of the present invention has been described above, the lighting switch 30 and the lighting switch 31 can be configured as operation switches that are closed by pulling operation.
With this configuration, the operation switch does not malfunction even if the illumination light hits another object, so that there is no inadvertent lighting. In the case where the illumination light is incorporated in a video camera, the second control transistor 16 is used.
It is possible to electrically control lighting and extinguishing in response to an operation signal from a video camera such that a positive pulse is applied to the base and a negative pulse is applied to extinguish the lamp. Further, if the lamp is electrically controlled to be turned on and off, the illumination light can be remotely controlled.

[0025]

As described above, in the illumination light circuit according to the present invention, the lighting switch element turns the lamp on and off.
Since the lamp is turned off by the switch element , these operation switch elements can be configured as a push switch or a pull operation switch having a simple configuration of two terminals , and there is no limitation on a mounting space and a mounting position. An illumination light circuit having an operation switch without malfunction is provided. Further, if the lighting signal and the off signal to generate the electronic signal source, lighting Lai preparative incorporated in a video camera, it was or can be a circuit configuration of the illumination light can remotely control.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a lighting circuit according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a lighting circuit according to a second embodiment of the present invention.

FIG. 3 is an illumination light circuit diagram shown as a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Battery power supply 12 Lamp 13 Power supply transistor 14 First control transistor 16 Second control transistor 23 Zener diode 24 Switching transistor 30 Lighting switch 31 Lighting off switch 32 Zener diode

Claims (1)

(57) [Scope of request for utility model registration] 1. A lamp power supply circuit that opens and closes a power supply path of a battery power supply by a switching operation of a power supply transistor to turn on and off a lamp, and a control circuit that turns on by input of a lighting signal.
Transistors for the feeding by the output signal of the transistor
A lighting control circuit for ON control data, detects the voltage level of the battery power source, transistors for the above control plans level or higher
And a holding circuit for holding the ON state of the data and releasing the holding at a predetermined level or below the predetermined level.
In the lighting circuit for lighting, a control truck of the lighting control circuit is used.
2 terminals that turn on by temporarily inputting lighting signal to transistor
The lighting switch element having the child configuration and the holding circuit
Holding input of the control transistor held in the N state
A two-terminal configuration that turns off the signal temporarily and turns it off
An illumination light circuit comprising a light switch element .