CN1606398A - Automatic regulating flash light circuit - Google Patents
Automatic regulating flash light circuit Download PDFInfo
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- CN1606398A CN1606398A CN 200310101515 CN200310101515A CN1606398A CN 1606398 A CN1606398 A CN 1606398A CN 200310101515 CN200310101515 CN 200310101515 CN 200310101515 A CN200310101515 A CN 200310101515A CN 1606398 A CN1606398 A CN 1606398A
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Abstract
A light automatic adjusting flash lamp circuit includes a flash lamp charge unit, a flash start unit, a flash lamp tube, a light test unit, an integrating circuit and a flash light volume control unit, among which, the flash lamp charge unit is used to control the charging action of a master capacitor, the flash start unit starts the lamp to illuminate the shot object, the light test receives the reflecting light of the shot object and converts the energy into electric signals, the integrating circuit receives said electric signals and regulates resistance value of the integrating circuit, when its volume value reaches to the exposing standard, the control unit turns off the lamp.
Description
Technical field
The present invention is a kind of camera flash circuit for lamp, refers in particular to a kind of camera flash circuit for lamp that can be with an automatic light meter.
Background technology
Photoflash lamp is the important accessory in the modern photography equipment, the progress and development of photoflash lamp and science and technology development synchronised.Common flash tube need be known and the distance of shot subject and the photosensitivity of used film, calculate the aperture of required use again, in the hope of correct exposure.A zoom table is all arranged at the photoflash lamp back side, selects the aperture taken for the user, actual use so not convenient.So photoflash lamp with an automatic light meter has just arisen at the historic moment.
Photoflash lamp with an automatic light meter is equipped with correspondent control circuits and photo-sensitive cell, as shown in Figure 1, and behind power connection, utilize the switching characteristic of transistor V1, form an intermittent oscillation, make alternating voltage of elementary acquisition of T1, boost through T1, make the alternating voltage of the about 60V of its secondary acquisition.Alternating voltage becomes direct voltage after diode D1 halfwave rectifier, to main capacitance C2 and the 3 charging energy storage of triggering capacitor C.Behind the photoflash lamp full charge, the flash synchronizing contact on the camera is connected flasher circuit.In traditional flash lamp circuit, be to utilize the control of opening the light of transistor charging current, the loop that utilizes RC to do frequency of oscillation is because transistor, resistance, capacitance error value are bigger, so the less stable of circuit relatively.In the conventional flash lamp light adjusting circuit, the judgement that stops the charging action is to be that the Zener diode of 270V is finished by a breakdown voltage, need this moment control to fill full by producing a High signalisation CPU voltage after the right-hand transistor 2SC1623 conducting, this moment, CPU can give another signal, stopped charging.The transistor DTC143EK that also will control by left does the control that stops to charge.Because the circuit feedback uses conventional transistor to do control, error amount is big, sometimes can produce misoperation.And the VR mobility scale is excessive, causes bad adjustment when initial setting with an automatic light meter.
Summary of the invention
In view of this, the present invention proposes a kind of flash lamp circuit with an automatic light meter, main purpose is: with an automatic light meter being more prone to when initial setting of photoflash lamp adjusted, reduced the departure of charging current simultaneously, improve the stability of circuit.
So to achieve these goals, flash lamp circuit with an automatic light meter proposed by the invention comprises: a flashlight charging unit, it is in order to the charging action of control main capacitance, the beginning that just decides the charging action according to the voltage of main capacitance with stop, but make the voltage of main capacitance be in operating state all the time; One photometry unit, it is in order to receiving the reverberation of subject, and should catoptrical light energy convert the signal of telecommunication to; One integrating circuit receives this signal of telecommunication, and exports a signal of telecommunication that is directly proportional with this flash of light light value, and it comprises a dimming resistor, in order to regulating the resistance of this integrating circuit, thereby regulates the output of this integrating circuit; One flash of light fader control unit in order to receiving the signal of telecommunication of this integrating circuit, when the flash of light light value of this signal of telecommunication correspondence reaches exposure and requires, extinguishes flash lamp tube.
Technical scheme of the present invention is achieved in that
A kind of flash lamp circuit with an automatic light meter is characterized in that comprising:
One flashlight charging unit, it is in order to charging action of control main capacitance, the beginning that just decides the charging action according to the voltage of main capacitance with stop, but make the voltage of main capacitance be in operating state all the time;
One flash of light start unit, but when this main capacitance is in operating state, receive the flash of light enabling signal that the user sends, carry out the startup of flash of light according to this flash of light enabling signal;
One flash lamp tube is in order to the light that flashes according to the flash of light enabling signal, irradiation subject;
One photometry unit, it is in order to receiving the reverberation of subject, and should catoptrical light energy convert the signal of telecommunication to;
One integrating circuit receives this signal of telecommunication, and exports a signal of telecommunication that is directly proportional with this flash of light light value, and it comprises a dimming resistor, in order to regulating the resistance of this integrating circuit, thereby regulates the output of this integrating circuit; And
One flash of light fader control unit in order to receiving the signal of telecommunication of this integrating circuit, when the flash of light light value of this signal of telecommunication correspondence reaches exposure and requires, extinguishes flash lamp tube.
But wherein said operating state scope is 270V～300V.
Wherein said flash of light start unit is a direct current transducer.
One group of Darlington circuit is arranged in the wherein said direct current transducer, come the charging rate of control capacitance by the current value of controlling Darlington circuit.
The size of current of wherein said Darlington circuit is controlled by a resistance.
Wherein said flash of light start unit also comprises a high-speed switch diode.
According to flash lamp circuit with an automatic light meter proposed by the invention, the startup by direct current transducer IC adjusts the control photoflash lamp reduces error amount, the stability of circuit raising relatively.Adopt the accurate dividing potential drop mode IC that arranges in pairs or groups to do the feedback of voltage, make entire circuit more stable, move more accurate.By regulating the resistance of dimming resistor in the integrating circuit, make the easier adjustment of initial setting with an automatic light meter of photoflash lamp, also make light modulation more accurate.
Description of drawings
Fig. 1 is the general frame figure of flash lamp circuit with an automatic light meter proposed by the invention
Fig. 2 is the overall circuit figure of the embodiment of the invention
Fig. 3 is the light adjusting circuit figure of the embodiment of the invention
Fig. 4 is the flash of light start-up circuit figure of the embodiment of the invention
Fig. 5 be the embodiment of the invention oscillation step-up circuit figure wherein, description of reference numerals is as follows:
110 flashlight charging unit
120 flash of light start units
130 flash lamp tubes
140 photometry unit
150 integrating circuit
160 flash of light fader control unit
Embodiment
Relevant detailed content of the present invention and technology now are described as follows with regard to conjunction with figs.:
The present invention is a kind of flash lamp circuit with an automatic light meter, and at first by explanation system of the present invention among Fig. 1, this figure is the module rack composition of flash lamp circuit with an automatic light meter proposed by the invention, is described as follows:
(1) the flashlight charging unit 110, and it is in order to charging action of control main capacitance, the beginning that just decides the charging action according to the voltage of main capacitance with stop, but make the voltage of main capacitance be in operating state all the time.When main capacitance voltage is lower than 270V, promptly begin the charging action, when main capacitance voltage arrives 300V, promptly stop the charging action.
(2) flash of light start unit 120 in order to receive the flash control signal that the user sends, is carried out the startup of flash of light according to this flash control signal.Comprising a direct current transducer IC, in one group of Darlington circuit is arranged, in order to the control signal that flashes, by control Darlington circuit current value come the charging rate of control capacitance.The size of current of Darlington circuit is controlled by a resistance, adds a high-speed switch diode simultaneously, to regulate the frequency of oscillation of direct current transducer.
(3) flash lamp tube 130, in order to the light that flashes, and the irradiation subject.
(4) the photometry unit 140, and it is in order to receiving the reverberation of subject, and should catoptrical light energy convert the signal of telecommunication to.
(5) integrating circuit 150, receive this signal of telecommunication, and export a signal of telecommunication that is directly proportional with this flash of light light value, and it comprises a dimming resistor, in order to regulating the resistance of this integrating circuit, thereby regulate the output of this integrating circuit.
(6) flash of light fader control unit 160, in order to receiving the signal of telecommunication of this integrating circuit, when the flash of light light value of this signal of telecommunication correspondence reaches exposure and requires, extinguish flash lamp tube.
See also Fig. 2, this figure is the circuit diagram of the embodiment of the invention.Behind the formula photoflash lamp full charge with an automatic light meter, the flash synchronizing contact on the camera is connected flasher circuit.Between the photoflash lamp light emission period, light sends from photoflash lamp and shines on the subject, reflects from subject to enter on camera (exposure) and the flash of light photometry element.This photometry element is very fast to be transformed into signal of telecommunication input integral circuit with light energy, again by signal of telecommunication that is directly proportional with the flash of light light value of integrating circuit output, when the flash of light light value reaches requiring of proper exposure amount, the output signal of telecommunication of integrating circuit just makes control circuit trigger flashing halt circuit, thereby makes blinker cancellation.Because the lasting flash time of photoflash lamp is very short, carry out light modulation to it, used photometry element must be the light-sensitive element with capability of fast response.
See also Fig. 3, because the difference that main capacitance is selected, therefore needs are adjusted the resistance of RC integrating circuit, and to 0.1uF, R424 is by 1K to 200 by 0.47uF for C410, but the VR of SMT is difficult accent, because of the circumference difference.If the too little numerical value of VR, electrorheological is big, makes curve deformation easily.Therefore we are at VR one termination one resistance, make VR do when fine setting can be so sensitive, for example: VR is 10K, changeing a little may be exactly the scope earthquake of 1K, sensitive, and 2K may have only 200 ohm mobility scale, more insensitive, for the photoflash lamp light adjusting circuit, its sensitivity is very high, so our connect again resistance of a 8.2K ohm of the VR of the 10K ohm VR that becomes 2K ohm originally.Initial setting with an automatic light meter is like this adjusted easily, and light modulation is more accurate.
Traditional flashing control circuit charges with transistor controls, and the outage after being full of, and the present invention uses the IC transducer.See also Fig. 4, it is a DC/DC transducer, come the speed of control capacitance charging via the current value of control Darlington (Darlington), the size of current of Darlington is to be limited by one 0.11 ohm resistance, this part can also add a high-speed switch diode and 3904 collocation come Control and Feedback to go into the voltage (being come out by the VCC3 dividing potential drop) of IC, to regulate the frequency of oscillation of this direct current transducer.
See also Fig. 5, Darlington circuit at IC is in order to provide enough big electric current to come boosted voltage through transformer, direct current transducer produces an interchange PWM AC signal and still be AC signal after transformer boosts, need rectification through diode, so that big electric capacity is charged, charging voltage should arrive 300V, the judgement that stops the charging action herein is to be the Zener diode of 270V by a breakdown voltage, when reaching 270V, produce the collapse action, this moment, voltage can be stabilized in 30V, needed two places of control this moment: one needs dividing potential drop to be fed back in the corresponding adjuster (Reference Regulator) of IC, dividing potential drop is controlled at 1.25V, the action that can stop charging this moment; Its two, the signal (originally for high voltage, transfer low-voltage behind the Ready to) that sends Strobe_Ready via the branch pressure-controlled 3904 of secondary gives CPU again.Adopt the accurate dividing potential drop mode IC that arranges in pairs or groups to do the feedback of voltage, make entire circuit more stable, move more accurate.
Though the present invention with aforesaid preferred embodiment openly as above; right its is not in order to limit the present invention; those skilled in the art without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention should be looked being as the criterion that accompanying Claim defines.
Claims (6)
1. flash lamp circuit with an automatic light meter is characterized in that comprising:
One flashlight charging unit, it is in order to charging action of control main capacitance, the beginning that just decides the charging action according to the voltage of main capacitance with stop, but make the voltage of main capacitance be in operating state all the time;
One flash of light start unit, but when this main capacitance is in operating state, receive the flash of light enabling signal that the user sends, carry out the startup of flash of light according to this flash of light enabling signal;
One flash lamp tube is in order to the light that flashes according to the flash of light enabling signal, irradiation subject;
One photometry unit, it is in order to receiving the reverberation of subject, and should catoptrical light energy convert the signal of telecommunication to;
One integrating circuit receives this signal of telecommunication, and exports a signal of telecommunication that is directly proportional with this flash of light light value, and it comprises a dimming resistor, in order to regulating the resistance of this integrating circuit, thereby regulates the output of this integrating circuit; And
One flash of light fader control unit in order to receiving the signal of telecommunication of this integrating circuit, when the flash of light light value of this signal of telecommunication correspondence reaches exposure and requires, extinguishes flash lamp tube.
2. flash lamp circuit with an automatic light meter as claimed in claim 1 is characterized in that, but described operating state scope is 270V～300V.
3. flash lamp circuit with an automatic light meter as claimed in claim 1 is characterized in that, described flash of light start unit is a direct current transducer.
4. flash lamp circuit with an automatic light meter as claimed in claim 3 is characterized in that, one group of Darlington circuit is arranged in the described direct current transducer, comes the charging rate of control capacitance by the current value of controlling Darlington circuit.
5. flash lamp circuit with an automatic light meter as claimed in claim 4 is characterized in that the size of current of described Darlington circuit is controlled by a resistance.
6. flash lamp circuit with an automatic light meter as claimed in claim 1 is characterized in that, described flash of light start unit also comprises a high-speed switch diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310101515 CN1606398A (en) | 2003-10-08 | 2003-10-08 | Automatic regulating flash light circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310101515 CN1606398A (en) | 2003-10-08 | 2003-10-08 | Automatic regulating flash light circuit |
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| Publication Number | Publication Date |
|---|---|
| CN1606398A true CN1606398A (en) | 2005-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310101515 Pending CN1606398A (en) | 2003-10-08 | 2003-10-08 | Automatic regulating flash light circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102894955A (en) * | 2011-07-29 | 2013-01-30 | 佳能株式会社 | Ophthalmologic apparatus |
| CN102984867A (en) * | 2012-12-17 | 2013-03-20 | 山东神思电子技术股份有限公司 | Photoinduction flash triggering device and flash triggering method |
| WO2013091466A1 (en) * | 2011-12-24 | 2013-06-27 | Lin Biguang | Led drive device with dimming and flashing functions |
| CN103683448A (en) * | 2012-08-29 | 2014-03-26 | 意法半导体(图尔)公司 | Charging circuit of a capacitor |
| CN104995999A (en) * | 2013-02-13 | 2015-10-21 | 保富图公司 | A driver circuit for a flash tube |
-
2003
- 2003-10-08 CN CN 200310101515 patent/CN1606398A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102894955A (en) * | 2011-07-29 | 2013-01-30 | 佳能株式会社 | Ophthalmologic apparatus |
| US8944595B2 (en) | 2011-07-29 | 2015-02-03 | Canon Kabushiki Kaisha | Ophthalmologic apparatus |
| CN102894955B (en) * | 2011-07-29 | 2015-06-17 | 佳能株式会社 | Ophthalmologic apparatus |
| WO2013091466A1 (en) * | 2011-12-24 | 2013-06-27 | Lin Biguang | Led drive device with dimming and flashing functions |
| CN103683448A (en) * | 2012-08-29 | 2014-03-26 | 意法半导体(图尔)公司 | Charging circuit of a capacitor |
| CN103683448B (en) * | 2012-08-29 | 2018-01-19 | 意法半导体(图尔)公司 | Capacitator charging circuit |
| CN102984867A (en) * | 2012-12-17 | 2013-03-20 | 山东神思电子技术股份有限公司 | Photoinduction flash triggering device and flash triggering method |
| CN104995999A (en) * | 2013-02-13 | 2015-10-21 | 保富图公司 | A driver circuit for a flash tube |
| CN104995999B (en) * | 2013-02-13 | 2017-09-29 | 保富图公司 | Drive circuit for flash tube |
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