CN1046049A - The electronic flash equipment of energy group flashing light - Google Patents

Abstract

The invention belongs to photographic goods.Existing flasher flash time is short, can not with the camera shutter speed synchronization, and be subjected to the big restriction of discharge capacity charge and discharge time constant, can not realize that high-frequency connects dodges.The present invention is separated into power capacitor and discharge capacity 2 parts with a thyristor with former discharge capacity, the charging of control discharge capacity, control the flash of light of flash lamp tube in addition with a thyristor, this on-off element can be connected in the fluorescent tube loop, also can be used for the triggering of control triggering electric circuit, the charging of trigger circuit is also controlled with on-off element.All on-off elements are controlled by control loop, realize that high-level efficiency connects sudden strain of a muscle.

Description

The electronic flash equipment of energy group flashing light

The invention belongs to photographic goods, it is group flashing light expeditiously, is equivalent to obtain uniform light output in longer cycle.

Existing electronic flash equipment is mainly by booster circuit, discharge capacity, compositions such as trigger circuit and flash lamp tube.After flash generator was opened, booster circuit charged to discharge capacity.Behind the discharge capacity full charge, trigger circuit triggers flash lamp tube, discharge capacity discharge, fluorescent tube flash of light.The flasher of this structure is luminous to be disposable, and flash time is shorter, differ greatly in each luminous intensity constantly of flash period, and the low luminous intensity time accounts for the large percentage of whole fluorescent lifetime.The light of sending out in this part low luminous intensity time is little to the photography effect, but consumed power is many, thereby luminescence efficiency is low.Because of the run duration of fluorescent lifetime, can not realize the synchronization flash of camera and flashlamp simultaneously less than camera shutter.Shutter speed must be placed when slr camera uses flashlamp on the shutter speed of special flash synchronization " X " shelves shutter or regulation for this reason, control exposure by adjusting aperture.When needs were luminous once more, discharge capacities such as palpus full charge again just can carry out, because the electric capacity of discharge capacity is very big, corresponding charging rate is also very big, thereby the flasher of this structure is not suitable for carrying out high-frequency group flashing light.Even the flashlamp with lock current circuit of new development now also can only shorten flash time and can not prolong flash time, still can't resolve the synchronization flash problem.

The objective of the invention is to realize that with better simply circuit flasher connects sudden strain of a muscle expeditiously, and available a series of pulsed light replaces the disposable big pulse flash of light of existing flasher short time, obtain the uniformly light-emitting in the longer cycle, realize and each grade of camera shutter speed synchronous light-emitting, break away from the restriction of " X " shelves shutter speed.

Although Japanese Zhao and 61-159628,159,629 two Zhuan profits have proposed to realize the flasher of high-frequency flash of light, and the sharp Zhong of two Zhuan of Zhe uses is connected on capacitor discharge The switch element of loop Zhong is controllable silicon, and Zhi can control conducting, can not control cut-off. Control cut-off and just need add complicated converter circuit, and the operating frequency of converter circuit is low, efficient is not high. When the Zai discharge time constant was big, this method can not realize that still high-frequency connects sudden strain of a muscle. Secondly flash lamp tube itself is exactly the outer switch element that adds the triggering signal conducting, do not need serial connection controllable silicon control conducting, thereby this Zhuan Zhi is complicated.

Thyristor K1 of main feature of the present invention: Yong, such as controllable silicon, high power transistor, power field effect pipe, integrated switching circuits etc. are separated into power capacitor C1 and discharge capacity C2 two parts with the discharge capacity of Yuan You. This switch element K1 is connected on the charge circuit Zhong of discharge capacity C2, the charging of control C2, and Zai C2 when discharge isolated C2 Yu the discharge process of C2 is accelerated in contacting of power supply+V1. Power capacitor C1 Ze consists of large power supply Yu booster circuit, shortens the charging interval of C2. Yong one Zhi thyristor K3 control triggers the discharge of capacitor C 3 in addition. In the big pulsed illumination situation of Zai high-frequency, the Zai flash lamp tube loop Zhong Zhi that connects can control the thyristor K2 of open and close, such as turn-off SCR (GTO), high power transistor, power field effect pipe, integrated switching circuit etc. When Zai flash of light later stage luminous intensity was low, switch element K2 cut-off forced the fluorescent tube deionization, stop luminous, thereby shortened fluorescent lifetime, improved luminous efficiency and frequency. For adapting to the needs of high-frequency group flashing light, trigger the also Yong switch element K4 control of charging of capacitor C 3, such as controllable silicon (SCR), high power transistor, power field effect pipe, integrated switching circuit relays etc. are realized quick charge. For improving the charge efficiency of electric capacity, the most fortunately charge circuit Zhong series inductance L. In addition conducting and the cut-off of a control loop gauge tap of You Yuan spare realizes group flashing light. The triggering signal control that control loop You adds is such as camera flash lamp contact, light, electric impulse signal, other trigger switch etc.

Below in conjunction with accompanying drawing the present invention is described in detail.

Accompanying drawing 1 is first embodiment of the present invention.C1 is a power capacitor, and C2 is a discharge capacity, and C3 triggers electric capacity.The control signal A that is come by control loop makes on-off element K4 conducting, thereby makes on-off element K1 conducting, and power supply+V1 is to C2, and C3 charges.Because the power of power supply is very big, C2, the electric capacity of C3 is less, and their charging rate is quite little, soon can full charge.C2, behind the C3 full charge, the electric current that K1, K4 flow through is zero, thereby ends.The control signal B that is come by control loop makes on-off element K3 conducting then, and C3 is by step-up coil L2 and K3 discharge, and the L2 secondary induction goes out high pressure, the conducting of trigger flashing fluorescent tube, and C2 is by fluorescent tube F discharge, lamp luminescence.After luminous, control loop is output signal A once more, repeats above process, realizes group flashing light.

Accompanying drawing 2 is embodiment 1(accompanying drawings 1) control loop.Multivibrator T2 among the figure can form with apportion element or integrated circuit, uses the LM555 integrated circuit in this example.The output terminal 3 oxide-semiconductor control transistors BG of integrated circuit end with saturated.Because the output terminal of multivibrator is just in time opposite with transistorized BG output, can distinguish gauge tap element K3, the conducting of K4.Multivibrator is then by K switch or other light, the length of control signal Control work times such as electricity.

Accompanying drawing 3 is second embodiment, the flashlamp loop thyristor K2 of a controllable switch that connected in this example, turn-off SCR (GTO).This on-off element K2 is the discharge of control triggering electric circuit simultaneously, thereby has saved the on-off element K3 among the embodiment 1, has simplified circuit.Course of work first part is identical with embodiment 1.But in the luminous later stage of flash lamp tube, controllable thyristor K2 ends, and fluorescent tube is forced to stop luminous.

Accompanying drawing 4 is current waveforms of the flash lamp tube F of accompanying drawing 1 and accompanying drawing 3.F1 among the figure is the waveform of the F of accompanying drawing 1, and F2 is the waveform of the F of accompanying drawing 3.

Accompanying drawing 5 is the another kind of control loops that are used for embodiment 1 or embodiment 2, is called 20 here.Loop 20 is by a light measuring circuit CL, and multivibrator T3 and on-off element control circuit are formed.Resistance R 10, integrating capacitor C10 and light activated element Si form light measuring circuit.Light activated element can be a photodiode, and triode etc. use photoelectric cell in this example.After the K switch closure, multivibrator is started working, and by the conducting of on-off element control circuit gauge tap element, flash lamp tube is luminous continuously.Under rayed, photoelectric cell Si charges to C10, rise to the unlatching threshold value of switch integrated circuit K10 when the voltage on the C10 after, the K10 conducting, oscillator quits work, flashlamp stop the flash of light.The light intensity that the length of flash light-emitting time is recorded by light measuring circuit is controlled.

Accompanying drawing 6 is the 3rd embodiment, control loop comprises flashing rate initialization circuit FF and guide number (time) initialization circuit FT among the figure, guide number or time setting circuit can be to form with digital circuits such as counters, form a timer that time-delay is adjustable with a LM555 integrated circuit in this example.At pulse signal of the input end In of timer input, timer output high level, oscillator vibration, flashlamp flash of light.Through certain time delay, the timer output low level, oscillator quits work, and flashlamp quits work, thereby has reached the purpose of control flashing rate and number of times.

Charging, the discharge of You Yu Yong thyristor control capacitance of the present invention, can obtain uniform high-frequency group flashing light, the disposable flash of light that a series of this high-frequency pulse light of Yong replace existing flash lamp can realize flash duration Yu Zhao camera shutter speed is synchronous.

Claims (6)

1, a kind of electronic flash equipment of energy group flashing light, form by a shell and the flash lamp tube and the internal circuit that are contained on the shell, it is characterized in that having in the internal circuit power capacitor C1 and discharge capacity C2, be connected on the thyristor K1 in the charge circuit of discharge capacity C2, be connected on the thyristor K3 that triggers in capacitor C 3 discharge loops.

2, electronic flash equipment according to claim 1 is characterized in that being in series with the thyristor K2 that can control conducting and end in the discharge loop of discharge capacity C2.

3,, it is characterized in that triggering in the charge circuit of capacitor C 3 and be in series with on-off element K4 according to claim 1 or the described electronic flash equipment of claim 2.

4, according to claim 1, or the described electronic flash equipment of claim 2, it is characterized in that the control loop that the gauge tap element conductive is arranged and end.

5, according to claim 1, or the described electronic flash equipment of claim 2, it is characterized in that having can be according to light intensity adjustment gauge tap element conductive that records and the photometry loop of the control loop working time that ends.

6,, it is characterized in that setting loop and flashing rate by guide number sets the control loop gauge tap element conductive of forming in the loop and end according to claim 1 or the described electronic flash equipment of claim 2.

Images