CN1259808C - Flash producing circuit - Google Patents
Flash producing circuit Download PDFInfo
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- CN1259808C CN1259808C CNB001370170A CN00137017A CN1259808C CN 1259808 C CN1259808 C CN 1259808C CN B001370170 A CNB001370170 A CN B001370170A CN 00137017 A CN00137017 A CN 00137017A CN 1259808 C CN1259808 C CN 1259808C
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- 239000003990 capacitor Substances 0.000 claims abstract description 242
- 238000004804 winding Methods 0.000 claims description 211
- 238000000034 method Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 32
- 239000000758 substrate Substances 0.000 description 19
- 238000004020 luminiscence type Methods 0.000 description 12
- 230000009471 action Effects 0.000 description 11
- 230000001360 synchronised effect Effects 0.000 description 9
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 7
- 229910052724 xenon Inorganic materials 0.000 description 7
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000001012 protector Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 206010021033 Hypomenorrhoea Diseases 0.000 description 2
- 239000005321 cobalt glass Substances 0.000 description 2
- 238000004043 dyeing Methods 0.000 description 2
- 210000004907 gland Anatomy 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005281 excited state Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
- H01L27/144—Devices controlled by radiation
- H01L27/146—Imager structures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Electromagnetism (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Stroboscope Apparatuses (AREA)
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
Abstract
In a flash light generation circuit, the primary side coil 16-3a of a trigger coil 16-3 is arranged together with a light emitting tube 16-1 in a discharge loop L1 where a power emitted from a main capacitor 13 flows, and the voltage of a built-in battery 1 is increased up to a prescribed voltage by a booster circuit 11, and the power is accumulated in the main capacitor 13 and a trigger capacitor 16-2, then, a trigger switch 15 is closed so that the current may flow in the primary side coil 16-3a, and then, the light is emitted from the light emitting tube 16-1 by a trigger voltage from the secondary side coil 16-3b.
Description
Technical field
The present invention relates to be used to produce the flash producing circuit of flash of light.
Background technology
Usually, well-known, known technology is: under the situation of the luminance shortage of object, the action of camera and shutter synchronously and emission is glistened comes the photo of photographic subjects thing.Such camera is provided with flash producing circuit, launches flash of light.
Figure 14 is the circuit diagram of traditional flash producing circuit.
Flash producing circuit 200 shown in Figure 14 is provided with booster circuit 211, and it links to each other with internal cell 1, is used to control whole camera.This booster circuit 211 is elevated to predetermined voltage with the voltage of internal cell 1.
And flash producing circuit 200 is provided with main capacitor 213, is used for by diode 212 storage of electrical energy, and electric energy is boosted by booster circuit 211.(-) end of main capacitor 213 is connected to the anode tap of diode 212, and the cathode terminal of diode 212 is connected to (-) output of booster circuit 211.And (+) end of main capacitor 213 is connected to (+) output of booster circuit 211.And resistive element 214 and trigger switch 215 are connected in series to (-) end and (+) end of main capacitor 213, and arc-tube 216 is parallel on the main capacitor 213.Arc-tube 216 has anode 216a and negative electrode 216b and side pole (sideelectrode) 216c, and xenon (Xe) sealing gland is contained in the arc-tube 216.
In addition, flash producing circuit 200 is provided with trigger winding 218, and trigger winding 218 is made up of former limit winding 218a with predetermined number of turn and the secondary winding 218b with big number of turn.The end of former limit winding 218a is connected to the tie point between resistive element 214 and the trigger switch 215 by triggering with capacitor 217.On the other hand, the end of secondary winding 218b is connected to the side pole 216c of arc-tube 216.The other end of the other end of former limit winding 218a and secondary winding 218b jointly is connected to the anode 216a of arc-tube 216.
In the flash producing circuit 200 of structure, at first, under the state that trigger switch 215 disconnects, the electric energy of internal cell 1 is boosted by booster circuit 211 on have.The electric energy that boosts is stored in the main capacitor 213 by diode 212.And the electric energy that boosts is stored in and triggers with in the capacitor 217 also by former limit winding 218a, triggering capacitor 217, resistive element 214 and diode 212.
Next step, when taking pictures, trigger switch 215 is synchronously closed with the shutter action of camera.Be stored in to trigger and be released with the electric energy in the capacitor 217.As a result, electric current flows in former limit winding 218a, and impels electromotive force to be created among the secondary winding 218b.Therefore, because the number of turn of secondary winding 218b is greater than the number of turn of former limit winding 218a, the electromotive force that produces in secondary winding 218b is exaggerated so that very big.Because this big electromotive force adds to the side pole 216c of arc-tube 216 as trigger voltage, the xenon that is encapsulated in the arc-tube 216 is excited.As a result, be stored in the electric energy in the main capacitor 213, discharge, flash of light is produced from arc-tube 216 by the discharge loop L that forms by (-) end of (+) end, anode 216a, negative electrode 216b and the main capacitor 213 of main capacitor 213.Just launched flash of light in such a way.
Figure 15 is the circuit diagram of traditional flash producing circuit, and it is different with flash producing circuit shown in Figure 14.Here, identical reference number gives the element components identical of those and flash producing circuit 200 shown in Figure 14.
(+) output of forming the booster circuit 211 of flash producing circuit 210, (+) that be connected to main capacitor 213 by diode 212 holds, and (-) output of booster circuit 211 is connected to (-) end of main capacitor 213.And the resistive element 214 of series connection and trigger switch 219 series connection are arranged on (+) end and (-) end of main capacitor 213.And (+) end and (-) end of main capacitor 213 are connected on the anode 216a and negative electrode 216b of arc-tube 216.Tie point between resistive element 214 and the trigger switch 219 by triggering with capacitor 217, is connected to the end of the former limit winding 218a of trigger winding 218, and the end of the secondary winding 218b of trigger winding 218, is connected to the side pole 216c of arc-tube 216.The former limit winding 218a and the secondary winding 218b other end separately are connected to the negative electrode 216b of arc-tube 216 jointly.
In the flash producing circuit 210 of the structure on have, when trigger switch 219 closures, be stored in and trigger with the discharge of the electric energy in the capacitor 217.As a result, electric current flows in former limit winding 218a, and produces the forceful electric power kinetic potential in secondary winding 218b.This electromotive force adds to the side pole 216c of arc-tube 216 as trigger voltage, and the xenon that is encapsulated in the arc-tube 216 is excited.Be stored in the electric energy in the main capacitor 213, discharge, flash of light is produced from arc-tube 216 by the discharge loop of forming by (-) end of (+) end, anode 216a, negative electrode 216b and the main capacitor 213 of main capacitor 213.
In above-mentioned flash producing circuit 200 or 210, when trigger switch 215 or 219 closures, and when trigger voltage gives arc-tube 216, the discharge beginning is the moment generation in arc-tube 216, and the luminous luminosity curve (after this being called the sudden change luminosity curve) that presents the rising of sudden change, wherein the peak value luminous quantity is very big, and very bob light end of fluorescent lifetime.Luminous in this sudden change luminosity curve is difficult to usually by means of closely accurate flash of light control exposure.Particularly in self-adjusting flash of light generating means with exposure adjustment circuit, be used to be controlled at the emission that stops to glisten when reaching predetermined luminous quantity, because the flash of light generating period is too short, when luminous quantity was adjusted, the response delay in the exposure adjustment circuit can not be followed the emission of flash of light.So just produced problem, that is, it is difficult adjusting luminous quantity in self-adjusting flash of light generating means.
In addition, for the emission that stops to glisten in luminescence process, non-contact switch is arranged in the discharge loop by arc-tube 216, and non-contact switch is closed and stopped luminous.This technology is known, but the predetermined luminous quantity in order to obtain glistening in short fluorescent lifetime will have king-sized electric current to flow through.As a result, must adopt large scale and expensive non-contact switch to be arranged on and bear big electric current in the discharge loop.
And in having sudden change luminosity curve luminous, the colour temperature of flash of light is very high, and emission has the light of a large amount of blue compositions.In order to revise this blue composition of light, protector must be set before luminous component in photo, for example protector is made up of the dyeing transparent dish.This will produce the problem that cost rises.
In order to address these problems, a kind of technology has been proposed, wherein choking-winding is added in the discharge loop, make luminosity curve become level and smooth.
Figure 16 is the circuit diagram of traditional flash producing circuit, and it is formed like this: choking-winding is connected in series on the main capacitor, and thyristor (thyristor) is parallel on the arc-tube.
In flash producing circuit shown in Figure 16 220, choking-winding 221 is connected in series on the main capacitor 213.And thyristor 222 is parallel on the arc-tube 216.The grid of thyristor 222 is connected to control end 224, is used to control the operation that opens or closes of thyristor 222.And, be used to adjust the resistive element 223 of the grid voltage of thyristor 222, be arranged on (-) end of the grid of thyristor 222 and main capacitor 213.
In this flash producing circuit 220, when the power supply of camera was opened for the first time, the control signal of ' L ' level was input to control end 224, and thyristor 222 is in off-state.And power storage is used in the capacitor 217 at main capacitor 213 and triggering.
When trigger switch 219 closures, be stored in and trigger, and electric current is mobile in former limit winding 218a, and electromotive force produces in secondary winding 218b with the discharge of the electric energy in the capacitor 217.Electromotive force adds to the side pole 216c of arc-tube 216, and the neon that is encapsulated in the arc-tube 216 is excited.Be stored in the electric energy in the main capacitor 213, discharge, flash of light is produced from arc-tube 216 by the discharge loop of forming by (-) end of (+) end, choking-winding 221, anode 216a, negative electrode 216b and the main capacitor 213 of main capacitor 213.Here, because choking-winding 221 is arranged in the discharge loop, the peak value of the electric current that flows in arc-tube 216 is suppressed.Like this, luminosity curve becomes smoothly, and the colour temperature of flash of light reduces, and glow color is more near natural daylight, and its Smalt composition is less.
Next step is adjusted in the circuit (not shown) in the exposure of self-adjusting flash of light generating means, and luminous quantity is integrated processing, and when reaching predetermined luminous quantity, the pulse signal input control end 224 of ' H ' level makes thyristor 222 conductings.Here, thyristor 222 is in the impedance of conducting state, than arc-tube 216 the impedance of excited state little (for example 1/10).Like this, be stored in the electric energy in the main capacitor 213, (-) end shunting from (+) end, choking-winding 221, thyristor 222 and the main capacitor 213 of main capacitor 213 makes luminous stopping.Here, because the peak value of the electric current that flows in thyristor 222 is suppressed by choking-winding 221, thyristor 222 can be by allowing the relatively little element of electric current to form.Also can be accurately controlled by this way, even at luminous quantity closely.
Figure 17 is the circuit diagram of traditional flash producing circuit, and it is formed like this: choking-winding and thyristor are connected in series to the two ends of main capacitor.
In flash producing circuit shown in Figure 17 230, choking-winding 221 and thyristor 222 are connected in series to the two ends of main capacitor 213.
When trigger switch 219 closures, be stored in and trigger with the discharge of the electric energy in the capacitor 217, electric current flows in former limit winding 218a, and produces electromotive force in secondary winding 218b.This electromotive force adds to the side pole 216c of arc-tube 216, and the neon that is encapsulated in the arc-tube 216 is excited.Be stored in the electric energy in the main capacitor 213, discharge, flash of light is produced from arc-tube 216 by the discharge loop of forming by (-) end of (+) end, anode 216a, negative electrode 216b and the main capacitor 213 of main capacitor 213.
Next step is adjusted in the circuit (not shown) in the exposure of self-adjusting flash of light generating means, and luminous quantity is integrated processing, and when reaching predetermined luminous quantity, the pulse signal of ' H ' level is input to control end 224, makes thyristor 222 conductings.Be stored in the electric energy in the main capacitor 213, (-) end shunting from (+) end, choking-winding 221, thyristor 222 and the main capacitor 213 of main capacitor 213 makes luminous stopping.By this way, have the electric current of big peak value, prevented from thyristor 222, to flow by choking-winding 221.
But, in above-mentioned flash producing circuit 220 and 230,, suppressed the peak value of the electric current that in arc-tube 216 and thyristor 222, flows because choking-winding 221 adds, have the problem generation that cost rises and the area of circuit substrate is very big.
Summary of the invention
The present invention proposes in order to solve top problem, and the purpose of this invention is to provide a kind of flash producing circuit, and its cost reduces and the area of circuit substrate reduces.
In order to have realized above-mentioned purpose, flash producing circuit of the present invention is characterized in that, it comprises: booster circuit; Main capacitor is used to store the electric energy that is boosted by booster circuit; Arc-tube relies on from the electric energy of main capacitor discharge and produces light; And circuits for triggering, it is provided with triggers with capacitor and trigger winding, the former limit winding of trigger winding is connected to triggering with on the capacitor, and triggering with the electric energy transmitting that flows in the capacitor to the secondary winding, trigger voltage is added on the arc-tube, and be arranged in discharge loop the same with arc-tube of former limit winding that it is characterized in that trigger winding, the electric energy that discharges from main capacitor are flowed in this loop.
In flash producing circuit of the present invention, be arranged in discharge loop the same of former limit winding of trigger winding with arc-tube, the electric energy that discharges from main capacitor flows in this loop.For this reason, discharge beginning and the time delay till the peak value of luminous quantity becomes maximum from arc-tube, and the peak value of luminous quantity becomes relatively little, and that light period keeps is longer, can obtain level and smooth relatively luminosity curve like this.Therefore, different with conventional art, will choking-winding be added to and obtain level and smooth luminosity curve in the discharge loop.As a result, the area of cost reduction and circuit substrate reduces.
Here, the former limit winding of trigger winding can be arranged on the anode tap of arc-tube, and perhaps the former limit winding of trigger winding can be arranged on the cathode terminal of arc-tube.
By this way, when the former limit of trigger winding winding was arranged on the anode tap of arc-tube or cathode terminal, the degree of freedom of circuit design had just improved.
In addition, flash producing circuit of the present invention is provided with non-contact switch in discharge loop.
Under non-contact switch was arranged on situation in the discharge loop, in the luminous zero hour, the non-contact switch closure produced flash of light from arc-tube.When reaching predetermined luminous quantity, non-contact switch disconnects, and flash of light is stopped.As a result, in self-adjusting flash of light generating means, can realize self-adjusting photocontrol.
Be provided with under the situation of non-contact switch, a shunting diode preferably is set, this shunting is connected between the anode of tie point between described trigger winding and the non-contact switch and described main capacitor with diode, when non-contact switch when closure state is converted to off-state, the electric current that the back electromotive force that this diode allows to produce in the former limit winding of trigger winding produces is shunted.
When the good non-contact switch of serviceability, promptly it is from the instantaneous off-state that changes to of closure state, and light is adjusted performance and improved, but big back electromotive force produces in the winding of the former limit of trigger winding.When shunting being set when use diode, the back electromotive force of generation directly is not added on the non-contact switch, makes non-contact switch avoid damage.
In addition, trigger with capacitor can apply (having) polarity () voltage so that be added to moment on the arc-tube, help to flow between the anode and negative electrode of arc-tube from the electric current that main capacitor discharges in trigger voltage.This triggering is connected between described main capacitor and the former limit of the described trigger winding winding with capacitor.
In another way,, pressurization can be set use capacitor, being used to apply polar voltages,, helping to flow between the anode and negative electrode of arc-tube from the electric current that main capacitor discharges so that be added to moment on the arc-tube in trigger voltage except triggering with the capacitor.This pressurization is connected between the tie point and the tie point between described trigger winding and the non-contact switch between described arc-tube and the former limit of the trigger winding winding with capacitor.
Pressurization is being set with under the situation of capacitor, preferred version is, is added to moment on the arc-tube in trigger voltage, when capacitors in series is used in main capacitor and pressurization, pressurization combines with main capacitor with capacitor, a voltage is added between the anode and negative electrode of arc-tube.
When trigger voltage is added to moment on the arc-tube, when polar voltages is added between the anode of arc-tube and the negative electrode, be added in trigger voltage that the time is easy to produce on the arc-tube from arc-tube.As a result, trigger the electricity consumption capacity of condenser and reduce, perhaps trigger voltage can reduce.
In addition, before trigger voltage is added to moment on the arc-tube, triggers and to remain on discharge condition, and the electric energy that discharges from main capacitor can be added to trigger voltage on the arc-tube by trigger winding through after wherein with capacitor.
In addition, the former limit winding and the main capacitor of trigger winding are preferably connected.
Because the former limit winding of trigger winding and main capacitor series connection, former limit winding can be used as the peak value that choking-winding is used for being suppressed at the electric current that flows in the arc-tube.As a result, can obtain level and smooth luminosity curve.
And, flash producing circuit of the present invention can be provided with shunt circuit, and this shunt circuit links to each other with main capacitor, is used at electric current in the arc-tube process of flowing, make provide from main capacitor and by the electric current shunting that arc-tube flows, flow in arc-tube thereby stop electric current.
When such shunt circuit is set, can luminescence process, stop from the flash of light of arc-tube.Like this, luminous quantity can Be Controlled.
In addition, shunt circuit can have: resistor, and it is connected with arc-tube; And switch element, it and arc-tube are arranged in parallel between the other end of a tie point and arc-tube, and tie point is arranged between the end of resistor and arc-tube.
Because shunt circuit has resistor and the switch element that is arranged in such a way, when flash of light produced from arc-tube, former limit winding and resistor all suppressed the peak value of the electric current that flows in the arc-tube.As a result, obtain more level and smooth luminosity curve, and when the flash of light that comes from arc-tube stopped, the peak value of the electric current that flows can be suppressed in switch element in luminescence process.
In addition, shunt circuit can have the resistor and the switch element of series connection, and switch element is used to control the on/off state of shunting.
Because shunt circuit has the resistor and the switch element of series connection, when the flash of light that produces from arc-tube stopped, former limit winding and resistor all were suppressed at the peak value of the electric current that flows in the switch element.
In addition, a light can be set adjust circuit, be used for detecting the moment that predetermined luminous quantity is launched from arc-tube, and the indication shunt circuit be shunted electric current according at the mobile electric current of arc-tube.
When such light being set adjusting circuit,, can be stopped from the flash of light of arc-tube in the moment that predetermined luminous quantity is launched from arc-tube.For this reason, can realize self-adjusting flash of light generating means.
In addition, shunt circuit can be connected in parallel by separable mode and arc-tube.
With such structure, when making common flasher and self-adjusting flash of light generating means (automatic flash device), here, common flasher does not stop flash of light in luminescence process, self-adjusting flash of light generating means control flash of light stops its emission in the moment that reaches predetermined luminous quantity, can make flash producing circuit and shunt circuit respectively, arc-tube is installed in the flash producing circuit.As a result, circuit part can be shared, manufacture process is simplified, and the trouble of production management reduces.And, when the adapter that circuit substrate is installed is added in the housing of common flasher, can easily realize automatic flash device.
Description of drawings
Fig. 1 is the circuit diagram according to the flash producing circuit of the first embodiment of the present invention.
Fig. 2 is the curve chart of the characteristics of luminescence of the characteristics of luminescence of flash producing circuit shown in Figure 1 and traditional flash producing circuit shown in Figure 14.
Fig. 3 is the circuit diagram of flash producing circuit according to a second embodiment of the present invention.
Fig. 4 is the circuit diagram of the flash producing circuit of a third embodiment in accordance with the invention.
Fig. 5 is the circuit diagram of the flash producing circuit of a fourth embodiment in accordance with the invention.
Fig. 6 is the circuit diagram of flash producing circuit according to a fifth embodiment of the invention.
Fig. 7 is the circuit diagram of flash producing circuit according to a sixth embodiment of the invention.
Fig. 8 is the circuit diagram of flash producing circuit according to a seventh embodiment of the invention.
Fig. 9 is the circuit diagram according to the flash producing circuit of the eighth embodiment of the present invention.
Figure 10 is the circuit diagram according to the flash producing circuit of the ninth embodiment of the present invention.
Figure 11 is the circuit diagram according to the flash producing circuit of the tenth embodiment of the present invention.
Figure 12 is the circuit diagram according to the flash producing circuit of the 11st embodiment of the present invention.
Figure 13 is the circuit diagram according to the flash producing circuit of the 12nd embodiment of the present invention.
Figure 14 is the circuit diagram of traditional flash producing circuit.
Figure 15 is the circuit diagram of traditional flash producing circuit, and it is different with flash producing circuit shown in Figure 14.
Figure 16 is the circuit diagram of flash producing circuit, and this circuit is to form like this: choking-winding is connected in series on the main capacitor, and thyristor is parallel on the arc-tube.
Figure 17 is the circuit diagram of flash producing circuit, and this circuit is to form like this: choking-winding and thyristor are connected in series to the two ends of main capacitor.
Embodiment
The various details preferred embodiment.Here description is installed in the flash producing circuit on the camera.
Fig. 1 is the circuit diagram according to the flash producing circuit of the first embodiment of the present invention.
Flash producing circuit 10 shown in Figure 1 is provided with booster circuit 11, and it links to each other with internal cell 1, is used to control whole camera.This booster circuit 11 arrives predetermined voltage with the boost in voltage of internal cell 1.
In addition, flash producing circuit 10 is provided with main capacitor 13, is used for by diode 12 storage of electrical energy, and this electric energy is boosted by booster circuit 11.Resistive element 14 and trigger switch 15 are connected in series to the two ends of main capacitor 13.
In addition, flash producing circuit 10 is provided with circuits for triggering 16, and circuits for triggering have arc-tube 16_1, trigger with capacitor 16_2 and trigger winding 16_3.
Arc-tube 16_1 has anode 16_1a, negative electrode 16_1b and side pole 16_1c, and xenon (Xe) sealing gland is contained among the arc-tube 16_1.Arc-tube 16_1 relies on and comes luminous from the electric energy of main capacitor 13 discharges.And trigger winding 16_3 comprises former limit winding 16_3a and secondary winding 16_3b, and former limit winding 16_3a has the predetermined number of turn, and the number of turn of the former limit of the turn ratio winding 16_3a that secondary winding 16_3b has is many.The end of former limit winding 16_3a is connected to the anode 16_1a of arc-tube 16_1.The end of former limit winding 16_3a is also used capacitor 16_2 by triggering, and is connected to the tie point between resistive element 14 and the trigger switch 15.Simultaneously, the end of secondary winding 16_3b is connected to the side pole 16_1c of arc-tube 16_1.The other end of the other end of former limit winding 16_3a and secondary winding 16_3b jointly is connected to (+) end of main capacitor 13.
The electric energy transmitting that trigger winding 16_3 will flow in triggering with capacitor 16_2 is given secondary winding 16_3b, is used for trigger voltage is added on the arc-tube on the 16_1.The former limit winding 16_3a of trigger winding 16_3 is the same with arc-tube 16_1 to be arranged among the discharge loop L1, mobile this loop from the electric energy of main capacitor 13 discharges.
In the flash producing circuit 10 with this spline structure, at first, under the state that trigger switch 15 disconnects, the electric energy of internal cell 1 is boosted by booster circuit 11.The electric energy that boosts is stored in the main capacitor 13 by diode 12.And the electric energy that boosts is stored in and triggers with among the capacitor 16_2 also by former limit winding 16_3a, triggering capacitor 16_2, resistive element 14 and diode 12.
Next step, when taking, trigger switch 15 is synchronous and closed with the action of camera shutter.The voltage of main capacitor 13 is added in an end that triggers with capacitor 16_2 by trigger switch 15, and the result than the positive voltage that the voltage that triggers with capacitor 16_2 exceeds, exports from triggering with the other end of capacitor 16_2.This positive voltage is added on the anode 16_1a and former limit winding 16_3a of 16_1 on the arc-tube.As a result, be stored in and trigger, and electric current is mobile in former limit winding 16_3a, and electromotive force is produced in secondary winding 16_3b with the discharge of the electric energy among the capacitor 16_2.Here, because the number of turn of the former limit of the turn ratio winding 16_3a of secondary winding 16_3b is many, the electromotive force that produces in secondary winding 16_3b is exaggerated very by force.Because such forceful electric power kinetic potential is added on the side pole 16_1c of 16_1 on the arc-tube as trigger voltage, the xenon that is encapsulated among the arc-tube 16_1 is excited.Be stored in the electric energy in the main capacitor 13, the loop L1 discharge by being made up of (-) end of (+) end of main capacitor 13, former limit winding 16_3a, anode 16_1a, negative electrode 16_1b and main capacitor 13 produces flash of light from arc-tube 161.By this way, flash of light just emits.
As mentioned above, in the flash producing circuit 10 of present embodiment, when trigger switch 15 closures, be added to moment on the arc-tube 16_1 in trigger voltage, trigger the anode 16_1a that positive voltage is added to arc-tube 16_1 with capacitor 16_2, and negative voltage is added to negative electrode 16_1b, and promptly applying polar voltages, polar voltages is used to help flowing from the electric energy of main capacitor 13 discharges.Like this, this voltage and the trigger voltage coupling that is added to 16_1 on the arc-tube make luminous easier from arc-tube 16_1.
Fig. 2 is the curve chart of the characteristics of luminescence of the characteristics of luminescence of flash producing circuit 10 shown in Figure 1 and traditional flash producing circuit 200 shown in Figure 14.
Curve A shown in Fig. 2 is a luminosity curve, and its shows the time from time of luminous beginning to luminous end, the characteristics of luminescence of flash producing circuit 200.Simultaneously, curve B is a luminosity curve, and its shows the time from time of luminous beginning to luminous end, the characteristics of luminescence of the flash producing circuit 10 of the preferred embodiment.There is not big difference between the integrated value of the luminous quantity of representing by curve A and the integrated value of the luminous quantity that curve B is represented.
Figure 14 is described as reference, and in traditional flash producing circuit 200, owing to have only arc-tube to be arranged in the discharge loop, discharge moment in arc-tube, and luminous generation burst luminosity curve and finishing, the burst luminosity curve is represented by curve A.Represent by the burst luminosity curve luminous in, be difficult to rely on closely accurate flash of light control exposure usually.And, since the flash of light colour temperature very high, and the emission light have a large amount of blue compositions, therefore, be necessary before luminous component, to be provided with protector, for example protector is made by the dyeing resin material.
Simultaneously, in the flash producing circuit 10 of present embodiment, the former limit winding 16_3a of trigger winding 16_3 equally is arranged among the discharge loop L1 with arc-tube 16_1, and is mobile this loop from the electric energy of main capacitor 13 discharges.For this reason, represent that the discharge from arc-tube 16_1 begins and till the peak value of luminous quantity becomes maximum as curve B among Fig. 2, this time is delayed, and the peak value of luminous quantity becomes relatively little, and obtains level and smooth luminosity curve, makes light period keep longer.
In addition, the value of the electric current that flows in the arc-tube 16_1 of flash producing circuit 10 is littler than the value of the electric current that flows in the arc-tube of traditional flash producing circuit 200.For this reason, although the light quantity of flash of light is held, the colour temperature of flash of light reduces, and glow color is near Natural color, and its Smalt composition is less.As a result, can obtain having the good homogeneous light of shooting.And because the value of the electric current that flows in arc-tube 16_1 is little, the life-span of arc-tube 16_1 prolongs.
In addition, when the present invention and conventional art comparison, cost reduces and the area of circuit substrate reduces, and in conventional art, choking-winding adds discharge loop and obtains level and smooth luminosity curve.
Fig. 3 is the circuit diagram of flash producing circuit according to a second embodiment of the present invention.
Here, identical reference number gives those and flash producing circuit 10 components identical shown in Figure 1, and below will explain characteristic.
Before triggering the moment that with capacitor 16_2 trigger voltage is added on the arc-tube 16_1, the flash producing circuit 20 of present embodiment remains on discharge condition, and when the electric energy from main capacitor 13 discharges allowed to pass through, trigger voltage was added on the arc-tube 16_1 by trigger winding 16_3.
Trigger with capacitor 16_2 and trigger switch 15 and hold from anode 16_1a, order is connected between the anode 16_1a and negative electrode 16_1b of arc-tube 16_1, and arc-tube 16_1 forms flash producing circuit 20 shown in Figure 3.And resistive element 14 is parallel to triggering with on the capacitor 16_2.
At first, when the power supply opening of camera, trigger switch 15 disconnects, and behind power supply opening, main capacitor 13 is recharged.Simultaneously, triggering remains on discharge condition with capacitor 16_2.
Below, when taking, trigger switch 15 is synchronous and closed with the action of camera shutter.The path flow of electric current from forming with (-) end of capacitor 16_2, trigger switch 15 and main capacitor 13 by (+) end of main capacitor 13, former limit winding 16_3a, triggering.Because electric current flows in former limit winding 16_3a, trigger voltage is added to side pole 16_1c from secondary winding 16_3b.Be stored in the electric energy in the main capacitor 13, discharge by the discharge loop L2 that forms that holds by (-) of (+) end of main capacitor 13, former limit winding 16_3a, anode 16_1a, negative electrode 16_1b and main capacitor 13.As a result, flash of light produces from arc-tube 16_1.In the closed by this way moment of trigger switch, when the electric energy from main capacitor 13 discharges allowed to pass through, electric current allowed to flow in former limit winding 16_3a, obtains trigger voltage.By this trigger voltage, light can be launched from arc-tube 16_1.
Fig. 4 is the circuit diagram of the flash producing circuit of a third embodiment in accordance with the invention.
In flash producing circuit shown in Figure 1 10, the former limit winding 16_3a of trigger winding 16_3 is arranged on the anode 16_1a end of arc-tube 16_1, but in flash producing circuit shown in Figure 4 30, the former limit winding 16_3a of trigger winding 16_3 is arranged on the negative electrode 16_1b end of arc-tube 16_1.And non-contact switch 17 is arranged between limit, discharge loop L3 Central Plains winding 16_3a and the main capacitor 13.Non-contact switch 17 has control end 18, is used to control the conducting or the off state of non-contact switch 17.And resistive element 14 and triggering are connected in series to the two ends of main capacitor 13 with capacitor 16_2.Resistive element 14 and triggering are connected to negative electrode 16_1b and former limit winding 16_3a with the tie point between the capacitor 16_2 by diode 16_4.
In the flash producing circuit 30 of present embodiment, at first, when the power supply opening of camera, the control signal of ' L ' level is input to control end 18, and non-contact switch 17 is in cut-off state.And power storage is at main capacitor 13 with in triggering with capacitor 16_2.
Here, when taking, synchronous with the shutter action of camera, the control signal of ' H ' level is input to control end 18.Non-contact switch 17 conductings, and be stored in the electric energy that triggers with among the capacitor 16_2, discharge by diode 16_4, former limit winding 16_3a and non-contact switch 17.As a result, electric current flows in former limit winding 16_3a, and trigger voltage is added to side pole 16_1c from secondary winding 16_3b.Be stored in the electric energy in the main capacitor 13, discharge by the discharge loop L3 that forms by (-) end of (+) end, anode 16_1a, negative electrode 16_1b, former limit winding 16_3a, non-contact switch 17 and the main capacitor of main capacitor 13.As a result, flash of light produces from arc-tube 16_1.After this, adjust in the circuit (not shown) in the exposure of self-adjusting flash of light generating means, luminous quantity is integrated, and when reaching predetermined luminous quantity, control signal becomes ' L ' level, and non-contact switch 17 ends, and makes luminous stopping.By this way, non-contact switch 17 is arranged among the discharge circuit L3, and non-contact switch 17 Be Controlled, and luminous quantity can closely be accurately controlled.
Fig. 5 is the circuit diagram of the flash producing circuit of a fourth embodiment in accordance with the invention.
In flash producing circuit shown in Figure 5 40, non-contact switch 17 is arranged among the discharge loop L4.And, be added in trigger voltage before the moment of arc-tube 16_1, the triggering of forming flash producing circuit 40 remains on discharge condition with capacitor 16_2, and when allowing when the electric energy that main capacitor 1 discharges passes through, trigger voltage is added on the arc-tube 16_1 by trigger winding 16_3.
Diode 16_4 and trigger switch 15 are connected in series in proper order from anode tap 16_1a between the anode 16_1a and negative electrode 16_1b of arc-tube 16_1.And resistive element 14 is parallel on the trigger switch 15.In addition, non-contact switch 17 is arranged between negative electrode 16_1b and the main capacitor 13.
At first, when the power supply opening of camera, the control signal of ' L ' level is input to control end 18, and non-contact switch 17 is in cut-off state.Main capacitor 13 is recharged, and triggering remains on discharge condition with capacitor 16_2.
Here, when taking, synchronous with the shutter action of camera, the control signal of ' H ' level is input to control end 18.Non-contact switch 17 conductings, and be stored in electric energy in the main capacitor 13 are by former limit winding 16_3a, diode 16_4, trigger with capacitor 16_2 and non-contact switch 17 discharges.As a result, electric current flows in former limit winding 16_3a, and trigger voltage is added to side pole 16_1c from secondary winding 16_3b.Be stored in the electric energy in the main capacitor 13, by the discharge loop L4 discharge of forming by (-) end of (+) end of main capacitor 13, former limit winding 16_3a, anode 16_1a, negative electrode 16_1b, non-contact switch 17 and main capacitor.As a result, flash of light produces from arc-tube 16_1.After this, when reaching predetermined luminous quantity, control signal changes to ' L ' level, and non-contact switch 17 ends, and makes luminous stopping.With such structure, luminous quantity can be accurately controlled.
Fig. 6 is the circuit diagram that shows flash producing circuit according to a fifth embodiment of the invention.
In flash producing circuit shown in Figure 6 50, non-contact switch 17 is arranged among the discharge loop L5.And, be added to moment on the arc-tube 16_1 in trigger voltage, the triggering capacitor 16_2 that forms this flash producing circuit 50 is added to polar voltages between the anode 16_1a and negative electrode 16_1b of arc-tube 16_1, and this polar voltages is used to help flowing from the electric energy of main capacitor 13 discharges.
In flash producing circuit 50, at first, the control signal of ' L ' level is input to control end 18, and non-contact switch 17 is in cut-off state.Electric energy is stored in the main capacitor 13 by diode 12.And electric energy is stored in and triggers with among the capacitor 16_2 also by diode 12, resistive element 14, triggering capacitor 16_2, former limit winding 16_3a and resistive element 16_6.
Here, when taking, synchronous with the shutter action of camera, the control signal of ' H ' level is input to control end 18.Non-contact switch 17 conductings, and the triggering current potential of the end (in non-contact switch 17 1 sides) of capacitor 16_2, burst ground drop to the current potential of (-) end of main capacitor 13.As a result, negative voltage is from triggering the other end output with capacitor 16_2, and this negative voltage is lower than (-) terminal voltage of main capacitor 13, and difference is for triggering the voltage with capacitor 16_2.This negative voltage is added on the negative electrode 16_1b, and is stored in the electric energy that triggers with among the capacitor 16_2, by non-contact switch 17, diode 16_5 and former limit winding 16_3a discharge.As a result, electric current flows in former limit winding 16_3a, and trigger voltage is added on the side pole 16_1c from secondary winding 16_3b.The electric energy that is stored in the main capacitor 13 discharges by discharge loop L5, and discharge loop L5 passes anode 16_1a, negative electrode 16_1b, former limit winding 16_3a, diode 16_4 and non-contact switch 17.As a result, flash of light produces from arc-tube 16_1.By this way, when the non-contact switch conducting, be added to moment on the arc-tube 16_1 in trigger voltage, positive voltage is added on the anode 16_1a, and negative voltage is added on the negative electrode 16_1b, be that polar voltages is added between the anode 16_1a and negative electrode 16_1b of arc-tube 16_1, polar voltages is used to help flowing from the electric energy of main capacitor discharge.This voltage and the trigger voltage coupling that is added on the arc-tube 16_1, make from arc-tube 16_1, produce luminous easier.
Next, when reaching predetermined luminous quantity, control signal changes to ' L ' level, and non-contact switch 17 ends, and makes luminous stopping.With such structure, luminous quantity can be accurately controlled.
Fig. 7 is the circuit diagram that shows flash producing circuit according to a sixth embodiment of the invention.
In flash producing circuit shown in Figure 7, former limit winding 16_3a and the non-contact switch 17 of arc-tube 16_1, trigger winding 16_3 are connected on the discharge loop L6 in proper order from (+) end of main capacitor 13.And resistive element 14 is used capacitor 16_2 with triggering, and holds from (+) of main capacitor 13 sequentially to be connected between its (+) end and (-) end.Resistance 14 and triggering are directly connected to the tie point between arc-tube 16_1 and the former limit winding 16_3a with the tie point between the capacitor 16_2.In addition, between (+) that shunting is connected to tie point between trigger winding 16_3 and the non-contact switch 17 and main capacitor 13 with diode 16_7 holds, i.e. shunting is connected to non-contact switch 17 1 sides with the anode of diode 16_7, and negative electrode is connected to main capacitor 13 1 sides.
In this flash producing circuit 60, at first, when the power supply opening of camera, the control signal of ' L ' level is input to control end 18, and non-contact switch 17 is in cut-off state.In addition, power storage is used in the capacitor 162 at main capacitor 13 and triggering.
Here, when taking, synchronous with the shutter action of camera, the control signal of ' H ' level is input to control end 18.Non-contact switch 17 conductings, and be stored in the electric energy that triggers with among the capacitor 16_2, by former limit winding 16_3a and non-contact switch 17 discharges.As a result, electric current flows in former limit winding 16_3a, and trigger voltage is added to side pole 16_1c from secondary winding 16_3b.Be stored in electric energy in the main capacitor 13 by discharge loop L6 discharge, discharge loop L6 passes that (-) of (+) end, anode 16_1a, negative electrode 16_1b, former limit winding 16_3a, non-contact switch 17 and the main capacitor 13 of main capacitor 13 hold.As a result, discharge forms flash of light from arc-tube 16_1.Below, exposure in self-adjusting flash of light generating means is adjusted in the circuit (not shown), and luminous quantity is integrated, and when reaching predetermined luminous quantity, control signal changes to ' L ' level.Non-contact switch 17 ends, and makes luminous stopping.
When non-contact switch 17 ends, by the preceding electric current that in former limit winding 16_3a, flows, cut off, and back electromotive force produces in former limit winding 16_3a by force just with happening suddenly.When this back electromotive force directly is added on the non-contact switch 17, have the possibility that non-contact switch 17 damages.But, under the situation of the flash producing circuit of the 6th embodiment shown in Figure 7, because shunting diode 16_7 is set, by the electric current that back electromotive force produces in trigger winding 16_3, mobile with diode 16_7 by shunting.As a result, the big voltage that is produced by back electromotive force is prevented from being added on the non-contact switch 17, so non-contact switch 17 is prevented to damage.
Here, when the flash producing circuit 30 of the 3rd embodiment shown in Figure 4, relatively the time, there are 2 differences with the flash producing circuit 60 of the 6th embodiment shown in Figure 7.
One is arranged on the shunting diode 16_7 in the flash producing circuit 60, is not arranged in the flash producing circuit shown in Figure 4 30.
This is because there are differences, shunting should be according to following factor setting with diode 16_7: the current's intensity that flows in arc-tube 16_1, withstand voltage or the non-contact switch 17 of non-contact switch 17 changes to the speed of closed condition from open mode, or even such shunt diode is not set, non-contact switch does not damage yet.Big relatively electric current flows situation about designing like this in arc-tube 16_1 under, or under the withstand voltage low relatively situation of non-contact switch 17, or change to from conducting state under the high relatively situation of the speed of cut-off state at non-contact switch 17, need the shunting diode, and under opposite situation, needn't need the shunting diode.
In addition, flash producing circuit 30 shown in Figure 4, and another point between the flash producing circuit 60 shown in Figure 7 is not both, in flash producing circuit shown in Figure 4 30, diode 16_4 is arranged on resistive element 14 and triggers with the tie point between the capacitor 16_2, and between the tie point between arc-tube 16_1 and the former limit winding 16_3a, and in flash producing circuit shown in Figure 7 60, these tie points are connected to each other directly.
As mentioned above, non-contact switch 17 conductings, and be stored in triggering with the discharge of the electric energy among the capacitor 16_2, make luminous beginning.Like this, after luminous beginning, change over moment of cut-off state at non-contact switch 17 from conducting state, it is empty triggering with capacitor 16_2.
Here, when non-contact switch 17 when conducting state changes over cut-off state, under the situation of flash producing circuit shown in Figure 4 30, luminously constantly stop changing.But, under the situation of flash producing circuit shown in Figure 7 60, constantly luminously do not stop just changing, and luminously stop after charging with capacitor 16_2 triggering.As a result, overexposure may take place.Like this, for example under the situation of the flash producing circuit that is used for microshot, the wherein luminous slight delay that stops seriously to cause exposure, and diode 16_4 preferably is set.On the contrary, be installed in not under the situation on the camera of shooting at close range photo, can remove diode 16_4 and reduce cost at flash producing circuit.
Fig. 8 is the circuit diagram that shows flash producing circuit according to a seventh embodiment of the invention.
In flash producing circuit shown in Figure 8 70, former limit winding 16_3a and the non-contact switch 17 of arc-tube 16_1, diode 16_4, trigger winding 16_3 are connected on the discharge loop L7 in proper order from (+) end of main capacitor 13.
In addition, resistive element 14 be connected to main capacitor 13 (+) end, and trigger winding 16_3 and non-contact switch 17 between tie point between.Pressurization with capacitor 16_8 be connected to tie point between arc-tube 16_1 and the diode 16_4, and trigger winding 16_3 and non-contact switch 17 between tie point between.Resistive element 19 be connected to tie point between arc-tube 16_1 and the diode 16_4, and (-) end of main capacitor 13 between.Trigger between (-) that be connected to tie point between diode 16_4 and the former limit winding 16_3a and main capacitor 13 with capacitor 16_2 hold.
In this flash producing circuit 70, at first, when the power supply opening of camera, the control signal of ' L ' level is input to control end 18, and non-contact switch 17 is in cut-off state.In this state, power storage is in main capacitor 13, and electric energy being stored in pressurization with among the capacitor 16_8 also by resistive element 14, pressurization capacitor 16_8 and resistive element 19.In addition, electric energy is also used capacitor 16_2 by resistive element 14, former limit winding 16_3a and triggering, is stored in and triggers with among the capacitor 16_2.
Here, when taking, synchronous with the shutter action of camera, the control signal of ' H ' level is input to control end 18.Non-contact switch 17 conductings, pressurization is with the current potential of the end (in non-contact switch 17 1 sides, being charged to (+)) of capacitor 16_8), burst ground is reduced to the current potential that (-) of main capacitor 13 holds.Pressurization has negative voltage with the other end (in arc-tube 1,6_1 one side) of capacitor 16_8, and negative voltage is lower than the voltage of (-) end of main capacitor 13, and difference is the voltage of pressurization with capacitor 16_8 two ends.This negative voltage is added in the negative electrode 16_1b of arc-tube 16_1.Like this, in this example, main capacitor 13 and the charging voltage sum of pressurization with capacitor 16_8, that is, the voltage of the twice of main capacitor charging voltage is added between the anode 16_1a and negative electrode 16_1b of arc-tube 16_1.
In addition, when non-contact switch 17 conductings, be stored in the electric energy that triggers with among the capacitor 16_2, by former limit winding 16_3a and non-contact switch 17 discharges.As a result, electric current flows in former limit winding 16_3a, and trigger voltage is added to side pole 16_1c from secondary winding 16_3b.Be stored in electric energy in the main capacitor 13 by discharge loop L7 discharge, discharge loop L7 passes anode 16_1a, negative electrode 16_1b, diode 16_4, former limit winding 16_3a and non-contact switch 17.As a result, flash of light produces from arc-tube 16_1.
By this way, under the situation of flash producing circuit shown in Figure 8 70, the double voltage of the charging voltage of main capacitor 13 is added in moment on the arc-tube 16_1 in trigger voltage, use capacitor 16_8 by pressurization, be added between the anode 16_1a and negative electrode 16_1b of arc-tube 16_1.This voltage and the trigger voltage coupling that is added on the arc-tube 16_1 guarantee luminous.
After this, when reaching predetermined luminous quantity, control signal changes to ' L ' level, and non-contact switch 17 ends, and makes luminous stopping.With such structure, luminous quantity can be accurately controlled.
Fig. 9 is the circuit diagram that shows according to the flash producing circuit of the eighth embodiment of the present invention.
In flash producing circuit shown in Figure 9 80, the former limit winding 16_3a of trigger winding 16_3 and main capacitor 13 series connection.Arc-tube 16_1 and the former limit winding 16_3a and main capacitor 13 parallel connections of connecting.Resistive element 14 and trigger switch 81 are connected on the two ends of arc-tube 16_1.Trigger with capacitor 16_2 be arranged on tie point between resistive element 14 and the trigger switch 81, and main capacitor 13 and former limit winding 16_3a between tie point between.And the secondary winding 16_3b of trigger winding 16_3 is connected to the side pole 16_1c of arc-tube 16_1.
In the flash producing circuit 80 with this spline structure, at first, at the state that trigger switch 81 disconnects, the electric energy of internal cell 1 is boosted by booster circuit 11.Electric energy is stored in the main capacitor 13 by the former limit winding 16_3a of diode 12, main capacitor 13 and trigger winding 16_3.And electric energy is also used the former limit winding 16_3a of capacitor 16_2 and trigger winding 16_3 by diode 12, resistive element 14, triggering, is stored in and triggers with among the capacitor 16_2.
Next step, when taking, trigger switch 81 is synchronous and closed with the shutter action of camera.Be stored in and trigger, and electric current is mobile in former limit winding 16_3a, and electromotive force is produced in secondary winding 16_3b with the discharge of the electric energy among the capacitor 16_2.This electromotive force is added in the side pole 16_1c of arc-tube 16_1, and the xenon that is encapsulated among the arc-tube 16_1 is excited.Being stored in the electric energy in the main capacitor 13, is (-) end discharge of (+) end, anode 16_1a, negative electrode 16_1b, former limit winding 16_3a and the main capacitor 13 of main capacitor 13 by discharge loop L8.As a result, flash of light produces from arc-tube 16_1.
Here, because the former limit winding 16_3a of trigger winding 16_3 and main capacitor 13 series connection, former limit winding 16_3a is used for being suppressed at the peak value of the mobile electric current of arc-tube 16_1 as choking-winding.As a result, can obtain level and smooth luminosity curve.
Figure 10 is the circuit diagram that shows according to the flash producing circuit of the ninth embodiment of the present invention.
In addition, flash producing circuit 90 is provided with circuit substrate 92, and circuit substrate 92 has link 92_1 and 92_2.Form shunt circuit 90_1 by thyristor 93 and resistive element 94, wherein resistive element 94 is connected on the grid of thyristor 93, and shunt circuit 90_1 is installed on the circuit substrate 92.When electric current flowed in arc-tube 16_1, this shunt circuit 90_1 shunt current stopped electric current and flows in arc-tube 16_1, and the electric current of being shunted is provided by main capacitor 13, and flows through from arc-tube 16_1.
In addition, light is adjusted circuit 95 and is installed on the circuit substrate 92, and light is adjusted circuit 95 and relied on the electric current that flows among the arc-tube 16_1, detects the moment of the light of scheduled volume from arc-tube 16_1 emission, instructs shunt circuit 90_1 shunt current.Light is adjusted circuit 95 and is comprised optical receiving sensor 95_1, capacitor 95_2, switch element 95_3, amplifier 95_4, variable resistance 95_5, comparator 95_6 and trigger generator 95_7.
Optical receiving sensor 95_1 receives the flash of light of arc-tube 16_1.Capacitor 95_2 storage is corresponding to the electric charge of the light quantity that is received by optical receiving sensor 95_1.Before flash of light produced from arc-tube 16_1, switch element 95_3 was controlled as closure state, comes remaining electric charge among the discharging capacitor 95_2.On the contrary, when flash of light produced, switch element 95_3 was controlled as off-state, allows capacitor 95_2 stored charge.Amplifier 95_4 amplifies voltage according to the electric charge of capacitor 95_2.Variable resistance 95_5 is provided with threshold value according to light and shade of film sensitivity, aperture, needs etc.The voltage of comparator 95_6 input amplifier 95_4 output and the threshold value that in variable resistance 95_5, is provided with, and when the voltage of amplifier 95_4 output surpasses threshold value, the signal of comparator 95_6 output ' H ' level.Trigger generator 95_7 receives from the signal of ' H ' level of comparator 95_6 output, and the output trigger impulse.
To explain the operation of flash producing circuit 90 below.Because closed and the operation when arc-tube 16_1 produces of glistening when trigger switch 81, identical with the operation of above-mentioned flash producing circuit 80, it describes omission.When flash of light when arc-tube 16_1 produces, optical receiving sensor 95_1 receives flash of light, and is stored among the capacitor 95_2 with the light quantity corresponding charge of reception.Amplifier 95_4 amplifies voltage according to electric charge.The voltage that amplifies is input to positive (+) end of voltage comparator 95_6.Threshold value is input to anti-phase (-) end of comparator 95_6.Comparator 95_6 with voltage and threshold ratio and when the voltage of amplifier 95_4 surpasses threshold value, outputs to trigger generator 95_7 with the signal of ' H ' level.As a result, trigger impulse is exported from trigger generator 95_7.
From the trigger impulse of trigger generator 95_7 output, the grid of input thyristor 93.Thyristor 93 is in conducting state then, and be stored in the electric energy in the main capacitor 13, order is shunted by (+) end, link 91_1, link 92_1, thyristor 93, link 92_2, link 91_2, the former limit winding 16_3a of trigger winding 16_3 and (-) end of main capacitor 13 of main capacitor 13.Because electric current flows in shunt circuit 90_1, this electric current is provided by main capacitor 13, and flows by arc-tube 16_1, and the electric current that flows in arc-tube 16_1 stops, and makes luminous stopping.Here, because the former limit winding 16_3a of trigger winding 16_3, has the electric current of big relatively peak value as choking-winding is prevented from the thyristor 93 and flows.
In the flash producing circuit 90 of present embodiment, because the former limit winding 16_3a of trigger winding 16_3 and main capacitor 13 series connection, when flash of light produced from arc-tube 16_1, former limit winding 16_3a was suppressed at the peak value of the electric current that flows among the arc-tube 16_1.As a result, can obtain level and smooth luminosity curve, and when the luminous quantity Be Controlled, the peak value of the electric current that flows can be suppressed in thyristor 93.For this reason, can adopt such thyristor 93, it bears relatively little electric current, has little size and cheap.And, because being set, light adjusts circuit 95, can realize self-adjusting flash of light generating means, and it control flash of light, makes luminous stopping when being scheduled to luminous quantity reaching.
In addition, in the flash producing circuit 90 of present embodiment, circuit substrate 92 is connected to circuit substrate 91 separably, and wherein shunt circuit 90_1 and light adjustment circuit 95 is installed on the circuit substrate 92, and arc-tube 16_1 etc. is installed on the circuit substrate 91.For this reason, when making the camera that passes through the camera of forming in conjunction with common flasher and pass through to form in conjunction with self-adjusting flash of light generating means (automatic flash device), circuit substrate 91 and circuit substrate 92 can be made respectively, wherein, when luminous, common flasher does not stop flash of light, and self-adjusting flash of light generating means then is used for control flash of light, when reaching predetermined luminous quantity the luminous of it is stopped.As a result, element production process is simplified, and the trouble of the management of product is reduced by shared.And, adopt such structure, that is, circuit substrate 92 is installed in the adapter, and adapter is added in the housing of camera, and common flasher is installed in the camera, can easily realize having the camera of automatic flash device.
Here, the description of the flash producing circuit 90 of present embodiment is to adjust the example of the signal controlling of circuit 95 at thyristor 93 by light, but it is not limited to this example, and thyristor 93 can by with the corresponding signal controlling of guide number.
Figure 11 is the circuit diagram that shows according to the flash producing circuit of the tenth embodiment of the present invention.
Flash producing circuit 100 shown in Figure 11 is provided with circuit substrate 101, and resistive element 102 wherein is housed, and resistive element 102 is connected between (+) end and the anode 16_1a of arc-tube 16_1 of main capacitor 13.And thyristor 93 is by link 101_1 and 92_1 and link 101_2 and 92_2, is arranged on the tie point between the anode 16_1a of resistive element 102 and arc-tube 16_1, and between the negative electrode 16_1b of arc-tube 16_1.Resistive element 102 and thyristor 93 are corresponding to shunt circuit of the present invention.
Because the flash of light generating means 100 of present embodiment, resistive element 102 and thyristor 93 with setting in this manner, when flash of light produces from arc-tube 16_1, former limit winding 16_3a and resistive element 102 all are suppressed at the peak value of the electric current that flows among the arc-tube 16_1, thereby obtain level and smooth luminosity curve.Simultaneously, in luminescence process, when the flash of light from arc-tube 16_1 stopped, former limit winding 16_3a and resistive element 102 all were suppressed at the peak value of the electric current that flows in the thyristor 93.
Figure 12 is the circuit diagram that shows according to the flash producing circuit of the 11st embodiment of the present invention.
Flash producing circuit 110 shown in Figure 12 has resistive element 111 and thyristor 93, thyristor 93 is used to control the state that opens or closes of shunt circuit, shunt circuit is connected between the anode 16_1a and negative electrode 16_1b of arc-tube 16_1 by tie point 91_1 and 92_1 and tie point 91_2 and 92_2.Resistive element 111 and thyristor 93 are corresponding to shunt circuit of the present invention.
Because the flash producing circuit 110 of present embodiment has the resistive element 111 and the thyristor 93 of series connection, in luminescence process, when the flash of light among the arc-tube 16_1 stopped, former limit winding 16_3a and resistive element 111 were suppressed at the peak value of the electric current that flows in the thyristor 93.
Figure 13 is the circuit diagram that shows according to the flash producing circuit of the 12nd embodiment of the present invention.
In flash producing circuit shown in Figure 13 120, a series of pulse signal input IGBT elements 124 produce pulse, and flash of light produce from arc-tube 16_1.When this flash producing circuit 120 with flash producing circuit 80 shown in Figure 9 relatively the time, trigger switch 81 is replaced by thyristor 121.The grid of thyristor 121 is connected on resistive element 122 and the control end 123.And, IGBT (Insulated Gate Bipoplar Transistor, being the insulated gate bipolar triode) element 124 is arranged among the discharge loop L9, wherein collector electrode is connected to the negative electrode 16_1b of arc-tube 16_1, and emitter is connected to (-) end of main capacitor 13 by the former limit winding 16_3a of trigger winding 16_3.The grid of IGBT element 124 is connected on the control end 125.
In flash producing circuit 120 with this structure, at first, the power supply opening of camera, the control signal of ' L ' level is input to control end 123, and thyristor 121 is in cut-off state.And the electric energy of internal cell 1 is boosted by booster circuit 11, and electric energy is stored in the main capacitor 13 by the former limit winding 16_3a of diode 12, main capacitor 13 and trigger winding 16_3.In addition, electric energy is also used the former limit winding 16_3a of capacitor 16_2 and trigger winding 16_3 by diode 12, resistive element 14, triggering, is stored in and triggers with among the capacitor 16_2.
Next step, when taking, synchronous with the shutter action of camera, trigger impulse is added on the control end 123.In addition, a series of pulse signal input control ends 125.Because trigger impulse is added on the control end 123, thyristor 121 is in conducting state, therefore is stored in to trigger with the discharge of the electric energy among the capacitor 16_2.Electric current flows in former limit winding 16_3a, and electromotive force produces in secondary winding 16_3b.This electromotive force is added on the side pole 16_1c of arc-tube 16_1, and the xenon that is encapsulated among the arc-tube 16_1 is excited.Simultaneously, because a series of pulse signals are also imported control end 125, according to this series of pulses signal, the 124 beginning switching manipulations of IGBT element.Be stored in the electric energy in the main capacitor 13, the discharge loop L9 discharge of promptly forming by discharge loop L9 by (-) end of (+) end, anode 16_1a, negative electrode 16_1b, IGBT element 124, former limit winding 16_3a and the main capacitor 13 of main capacitor 13, and glisten and from arc-tube 16_1, produce.Here, because the former limit winding 16_3a of trigger winding 16_3 and main capacitor 13 series connection, the peak value of the pulse current that flows in IGBT element 124 is suppressed by former limit winding 16_3a.Like this, do not need choking-winding, and can adopt IGBT element 124 thus with relatively little permission electric current.As a result, cost can reduce.
Claims (15)
1. flash producing circuit, it is characterized in that: it comprises:
Booster circuit;
Main capacitor is used to store the electric energy that is boosted by booster circuit;
Arc-tube is used for relying on the electric energy that discharges from described main capacitor to produce light; With
Circuits for triggering, it is provided with triggers with capacitor and trigger winding, limit, trigger winding Central Plains winding be connected to described triggering with capacitor on, and described triggering with capacitor in mobile electric energy be transferred to the secondary winding, trigger voltage is added on the described arc-tube
The former limit winding of wherein said trigger winding equally is arranged in the discharge loop with described arc-tube, and the electric energy that discharges from described main capacitor flows in this loop.
2. flash producing circuit according to claim 1 is characterized in that: the former limit winding of described trigger winding is arranged on the anode of described arc-tube.
3. flash producing circuit according to claim 1 is characterized in that: the former limit winding of described trigger winding is arranged on the negative electrode of described arc-tube.
4. flash producing circuit according to claim 1 is characterized in that: described non-contact switch is arranged in the described discharge loop.
5. flash producing circuit according to claim 4, it is characterized in that: it comprises the shunting diode, this shunting is connected between the anode of tie point between described trigger winding and the non-contact switch and described main capacitor with diode, be used for when described non-contact switch when conducting state is changed into cut-off state, the electric current shunting that permission is produced by back electromotive force, back electromotive force is created in the former limit winding of described trigger winding.
6. flash producing circuit according to claim 1 is characterized in that: described triggering is connected between described main capacitor and the former limit of the described trigger winding winding with capacitor; Be added in moment on the described arc-tube in trigger voltage, described triggering, is added between the anode and negative electrode of described arc-tube polar voltages with capacitor, and polar voltages is used for helping flowing of the electric energy that discharges from described main capacitor.
7. flash producing circuit according to claim 4, it is characterized in that: it comprises the pressurization capacitor, this pressurization is connected between the tie point and the tie point between described trigger winding and the non-contact switch between described arc-tube and the former limit of the trigger winding winding with capacitor, be used for being added in moment on the described arc-tube in trigger voltage, polar voltages is added between the anode and negative electrode of described arc-tube, polar voltages is used for helping flowing of the electric energy that discharges from described main capacitor.
8. flash producing circuit according to claim 7, it is characterized in that: described main capacitor and described pressurization capacitors in series, be added in moment on the described arc-tube in trigger voltage, described pressurization combines with described main capacitor with capacitor, voltage is added between the anode and negative electrode of described arc-tube.
9. flash producing circuit according to claim 1, it is characterized in that: this flash producing circuit comprises that further one is used to trigger switch that electric current is flow through, this trigger switch and described triggering with capacitors in series after, be connected in parallel between the anode and negative electrode of described arc-tube; Before trigger voltage was added in moment on the described arc-tube, described triggering remained on discharge condition with capacitor, and after the electric energy of described main capacitor discharge passes wherein, by described trigger winding, trigger voltage was added on the described arc-tube.
10. flash producing circuit according to claim 1 is characterized in that: the former limit winding of described trigger winding and the series connection of described main capacitor.
11. flash producing circuit according to claim 1, it is characterized in that: it comprises shunt circuit, this shunt circuit links to each other with described main capacitor, be used at electric current in described arc-tube process of flowing, the electric current shunting of also flowing by described arc-tube that described main capacitor is provided is flowed in arc-tube to stop electric current.
12. flash producing circuit according to claim 11 is characterized in that: described shunt circuit has: resistor, connect with described arc-tube; And switch element, and described arc-tube is connected in parallel between another terminals of tie point between the terminals that are arranged at described resistor and described arc-tube and described arc-tube.
13. flash producing circuit according to claim 11 is characterized in that: described shunt circuit has the resistor and the switch element of series connection, is used to control the on/off state of shunt circuit.
14. flash producing circuit according to claim 11, it is characterized in that: it comprises light adjustment circuit, be used for the electric current that flows according at described arc-tube, detect the moment that predetermined luminous quantity is launched from described arc-tube, and instruct described shunt circuit shunt current.
15. flash producing circuit according to claim 11 is characterized in that: described shunt circuit is in parallel separably with described arc-tube.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32511699 | 1999-11-16 | ||
| JP325116/99 | 1999-11-16 | ||
| JP2000255769 | 2000-08-25 | ||
| JP2000255769 | 2000-08-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1340989A CN1340989A (en) | 2002-03-20 |
| CN1259808C true CN1259808C (en) | 2006-06-14 |
Family
ID=26571726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001370170A Expired - Fee Related CN1259808C (en) | 1999-11-16 | 2000-11-16 | Flash producing circuit |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100514130B1 (en) |
| CN (1) | CN1259808C (en) |
| TW (1) | TW494267B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107430317B (en) * | 2015-03-02 | 2020-07-03 | 保富图公司 | Flash generator and flash head and extension cable with identification electronics |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6150125A (en) * | 1984-08-18 | 1986-03-12 | West Electric Co Ltd | Electronic flash device |
| JPH03230136A (en) * | 1990-02-05 | 1991-10-14 | Mitsubishi Electric Corp | Electronic flash device |
| JPH04344622A (en) * | 1991-05-22 | 1992-12-01 | Olympus Optical Co Ltd | Strobe light emission controller |
| JP2784643B2 (en) * | 1996-02-20 | 1998-08-06 | 機 松尾 | Constant voltage automatic charging strobe circuit |
| JPH10153814A (en) * | 1996-09-30 | 1998-06-09 | Fuji Photo Film Co Ltd | Stroboscopic circuit |
-
2000
- 2000-11-15 KR KR10-2000-0067761A patent/KR100514130B1/en not_active IP Right Cessation
- 2000-11-15 TW TW089124139A patent/TW494267B/en not_active IP Right Cessation
- 2000-11-16 CN CNB001370170A patent/CN1259808C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| TW494267B (en) | 2002-07-11 |
| KR20010051705A (en) | 2001-06-25 |
| KR100514130B1 (en) | 2005-09-09 |
| CN1340989A (en) | 2002-03-20 |
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Granted publication date: 20060614 Termination date: 20101116 |