CN2146101Y - Flash lamp - Google Patents

Abstract

The utility model relates to a flash lamp, which is a photograph light source and is composed of a flash tube, a basic flash circuit, a voltage-stabilizing regulating circuit, and a flash triggering circuit. The utility model is characterized in that the voltage-stabilizing regulating circuit is provided with a divider resistance with big resistance and a variable resistor. After the resistance of the variable resistor is adjusted, stable voltage value on the both ends of a storage capacitor in the basic flash circuit can be altered. So the illumination intensity of the flash lamp can be adjusted. The adjusting means can lead the illumination intensity to get fine multi-stage regulation or stageless regulation. In addition, due to the adoption of the divider resistance with big resistance, the current is led to micro electricity. So the service lives of relevant components are improved and the illumination intensity is improved.

Description

Flash lamp

The utility model relates to a kind of photoflash lamp as photography.

Photoflash lamp is to utilize storage capacitor that flash tube is carried out transient large current discharge and the photography that produces high light, flash tube has basic flasher circuit, circuit and flash trigger circuit are adjusted in voltage stabilizing, wherein the effect of voltage stabilizing adjustment circuit is to make the magnitude of voltage at the storage capacitor two ends in the basic flasher circuit keep stable, and the capacitance of change storage capacitor, the output voltage of storage capacitor is changed, and then the intensity of illumination of photoflash lamp output is changed, thereby satisfy the photography needs under the different condition, and the regulative mode of known storage capacitor capacitance is the condenser type adjusting, promptly join the different storage capacitor of some capacitances as And, make every storage capacitor incorporate circuit working into respectively by switch at basic flasher circuit; Can reach the purpose of regulating intensity of illumination like this, but there is following problem in this regulative mode: it is few one, to regulate progression, limited adjustment range system; Two, by-pass cock must bear heavy current impact, damages easily.

The purpose of this utility model provides a kind of adjusting by little electric current, can make the intensity of illumination of output obtain the photoflash lamp of meticulous adjusting.

Solving scheme of the present utility model is to adjust the divider resistance that variable resistor and big resistance are set in the circuit in voltage stabilizing.

Further illustrate detailed content of the present utility model below in conjunction with drawings and Examples.

Fig. 1: block diagram of the present utility model;

Fig. 2: circuit theory diagrams of the present utility model.

Photoflash lamp described in the utility model is made up of flash tube SD and basic flasher circuit, voltage stabilizing adjustment circuit, flash trigger circuit, and wherein basic flasher circuit comprises voltage lifting mechanism B, current-limiting resistance R, rectification thyristor SCR ₁With storage capacitor C, the divider resistance R that circuit comprises big resistance is adjusted in voltage stabilizing ₁And R ₂, variable resistor W, sampling voltage-stabiliser tube Dw, bypass thyristor SCR ₂And voltage regulation resistance R ₃, the main member of flash trigger circuit is trigger winding L and button K.Energized promotes supply voltage by voltage lifting mechanism B earlier, to adapt to the requirement that still can satisfy flash tube SD standard operation voltage when line voltage descends, then through current-limiting resistance R current limliting and rectification thyristor SCR ₁Rectification is promptly to storage capacitor C charging, when reaching operating voltage, by trigger winding L trigger flashing pipe SD discharge flash of light; Voltage stabilizing is adjusted circuit and is not punctured bypass thyristor SCR because of sampling voltage-stabiliser tube Dw early stage in charging ₂No bias current is not worked, when storage capacitor C both end voltage rises to certain value, because divider resistance R ₂Dividing potential drop reaches sampling voltage-stabiliser tube D breakdown voltage value, bypass thyristor SCR ₂Be switched on, at this moment, make rectification thyristor SCR because of the A point is in electronegative potential ₁End, stop charging to storage capacitor C, and when storage capacitor C both end voltage descends, bypass thyristor SCR ₂Again end rectification thyristor SCR ₁Then being switched on And continues to charge to storage capacitor C, so repeatedly, keep storage capacitor C both end voltage value stabilization, regulate the resistance of variable resistor W, then can change the stable voltage at storage capacitor C two ends, at this moment, the accumulate capacity ， And that has also just changed storage capacitor C reaches the purpose of adjusting intensity of illumination.

The utility model is owing to adopted the regulative mode of resistance-type, can make the intensity of illumination of photoflash lamp output obtain meticulous multistage or step-less adjustment, owing to adopted the divider resistance of big resistance, make electric current tend to little simultaneously, like this, about also just having improved the useful life of components and parts.

Claims (1)

1, a kind of photoflash lamp as photography is made up of flash tube, basic flasher circuit, voltage stabilizing adjustment circuit and flash trigger circuit, and it is characterized in that: the divider resistance R that variable resistor W and big resistance are set in the circuit is adjusted in voltage stabilizing ₁, R ₂

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