CN1811578A - Flash unit - Google Patents
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- CN1811578A CN1811578A CN 200510070248 CN200510070248A CN1811578A CN 1811578 A CN1811578 A CN 1811578A CN 200510070248 CN200510070248 CN 200510070248 CN 200510070248 A CN200510070248 A CN 200510070248A CN 1811578 A CN1811578 A CN 1811578A
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Abstract
The present invention provides a flash unit, wherein a flash circuit comprises a Zener diode (37) connected to an intermediate output terminal (23f) provided at an intermediate point of the secondary coil of an oscillation transformer (23), and the transformer (23), and an oscillation transistor (22) constitute an oscillation circuit. Potential at the intermediate output terminal (23f) varies in proportion to the charging voltage of a main capacitor (41). When the main capacitor (41) acquires a specified charging voltage, a Zener current flows through the Zener diode (37) to actuate a stopping transistor (38), thus disabling the oscillation circuit. When a flash charging switch (51) is turned on, the forward end at the light guide part of a charge indication member (60) projects from a film unit having a lens. When the main capacitor is charged up to the specified voltage, a light emitting element is actuated to emit its light from the forward end of the light guide part.
Description
Technical field
The application is dividing an application of Chinese patent application the 988085305th.
The present invention relates to flasher, the flasher in the equipment lens-fitted photo film assembly that particularly is fit to pack into, this assembly comprise a volume photographic film and are furnished with the simple photograph mechanism that comprises phtographic lens.
Background technology
Low when the degree of suitable exposure can not be provided under without any artificial lighting condition when the brightness of photography target, often use the release of flasher and shutter synchronously with light directive photography target.Because minicam and equipment lens-fitted photo film assembly have the cheap lens system than the large aperture number, thus most of minicam and equipment lens-fitted photo film assembly all be provided with in the flasher of dress.In order to carry out strobo photography, must before discharging, shutter make main capacitor charge to setting voltage.Common flasher begins charging in response to the action of flash charging switch.
For example, disclosed a kind of flasher circuit recently in JPA 7-122389, wherein, in case connect flash charging switch, main capacitance then is recharged, even after flash charging switch turn-offs, main capacitor is still continued charging.When main capacitor reached the setting charging voltage, flasher circuit stopped charging.Below, such flasher called stop flasher circuit automatically.
Figure 24 represents to stop automatically the example of flasher circuit, and except some fine differences, the circuit that discloses among this flasher circuit and the JPA 7-122389 has roughly the same structure.In flasher circuit shown in Figure 24, when connecting flash charging switch 200, oscillistor 201 is energized, and because the positive feedback starting oscillation of oscillation transformer 202.This vibration causes the primary current that flows through primary coil 202a to increase, and the collector current that promptly flows to oscillistor 200 collectors increases.As a result, electromotive force is by secondary coil 202b induction current, and this electric current makes main capacitor 204 chargings by commutation diode 203.
Because collector current flows through oscillistor 201, so 205 conductings of locking transistor.Subsequently, when the increment of elementary electric current descends, produce inverse electromotive force in secondary coil 202b, electric current feeds back to oscillistor 201 from oscillation transformer 202, and promptly the base current of oscillistor 201 begins to descend.But, be applied on the base stage of oscillistor 201 by the locking transistor 205 that is in the ON state from the voltage of battery 206, oscillistor 201 is not ended fully.Therefore, primary current begins to flow once more, thereby oscillistor 201 continues vibration, makes main capacitor 204 chargings.
Being equipped with Zener voltage is the Zener diode 207 of 300V, in order to when main capacitor 204 charges to the setting voltage of 300V, and beginning conducting Zener current.Because Zener current makes base current be applied to one and stops on the base stage of transistor 208, so stop transistor 208 conductings.When stopping transistor 208 conductings, the emitter and the base stage of oscillistor 201 interconnect, and make oscillistor 201 end fully, thereby locking transistor 205 end.By this way, when main capacitor 204 was charged to setting voltage, vibration stopped, to stop the main capacitor 204 that charges.
Above stopping automatically in the flasher circuit, because when charging voltage reaches setting value, the charging voltage of main capacitor is applied on the Zener diode, conducting is used for excitation and stops transistorized Zener current, so Zener diode must have big Zener voltage, for example with the suitable 300V of setting charging voltage.Because the Zener diode with big Zener voltage is expensive, institute is so that the cost increase of flasher circuit.In addition, the common flasher circuit that stops automatically needing a large amount of spaces to install for the automatic continuous of charging and to stop be essential above-mentioned various elements.
The equipment lens-fitted photo film assembly of flasher is housed simultaneously, as everyone knows within it.Owing to require the flasher cheapness and the miniaturization of equipment lens-fitted photo film assembly, so flashing switch is made of the metal blade and the contact chip that are formed on the flash circuit board, by manual operational unit metal blade is contacted with contact chip, thereby closed flasher circuit, and therefore make flasher circuit begin charging.Usually, manual operational unit is pushbutton switch or slide switch.Some common manual operational units are furnished with retention mechanism, utilize this mechanism, in case the transient operation functional unit, metal blade just keeps and the contacting of contact chip so.Other design is, has only when the cameraman operates manual operational unit, and metal blade is contacted with contact chip.
The flasher of equipment lens-fitted photo film assembly has been furnished with the light-emitting component that shows that the flasher charging is finished.In common equipment lens-fitted photo film assembly, this light-emitting component is placed on the back of the display window that forms by equipment lens-fitted photo film assembly rear wall, or places and be connected light is guided on the photoconduction of view finder visual field from light-emitting component.
Be provided with at the charge switch operating means under the situation of fastener, as long as operating means is in the ON position, flasher just keeps charging.After photography finishes, if operating means still is in charge position, so with regard to consuming cells.As a result, battery consumes gradually, before finishing all effective exposures, just becomes and can not use flasher.Have only cameraman's checked operation position component or when photography finishes, check the light of self-emission device, just can avoid this trouble.But, according to the structure of common equipment lens-fitted photo film assembly, be not easy to know the switch situation of functional unit hurriedly at a glance, or can not see the charged state display light from the outside of equipment lens-fitted photo film assembly.Therefore, the cameraman may forget charge switch is reset to the OFF position.
In view of the foregoing, primary and foremost purpose of the present invention be to provide a kind of reduce that cost and space can not reduce reliability and stability simultaneously stop flasher automatically.
Another object of the present invention is to provide a kind of can prevent effectively that the cameraman from forgetting the flasher that turn-offs flash charging switch, and this flasher is particularly suitable for equipping the lens-fitted photo film assembly.
The general introduction of invention
In a flasher, the oscillatory circuit of starting oscillation when being included in the flash charging switch conducting, wherein, oscillatory circuit comprises oscillation transformer, this oscillation transformer has primary coil that is connected with power supply and the secondary coil that is connected with main capacitor, and secondary coil and primary inductance coupling are so that respond to high voltage and current in secondary coil when oscillatory circuit vibrates, main capacitor is charged to the charging voltage of setting with high voltage and current
The present invention includes the tapping point that is arranged at the secondary coil centre position, this tapping point have with main capacitor on the current potential of the proportional change of charging voltage; The Zener diode that is connected with tapping point, Zener diode conducting Zener current when the current potential on the tapping point reaches setting charging voltage with main capacitor and is worth accordingly; With stop transistor, make the oscillatory circuit failure of oscillations when main capacitor reaches when setting charging voltage, thereby stop the charging of main capacitor.
Flasher of the present invention can use the cheap Zener diode with low Zener voltage, so that can reduce the cost of flasher.
By stopping capacitor being charged with reach the Zener current that flows when setting charging voltage when main capacitor, the electric current from the discharge of stopping capacitor is applied to through resistor stops on the transistor then, make to stop the transistor operation of the maintenance schedule time.This guarantees main capacitor is stopped charging, also prevents the accidental interruption of the charging that may cause because of noise.
In addition, stop that the temperature coefficient of forward voltage of commutation diode that flows to the electric current of Zener diode from tapping point should have the polarity opposite with the Temperature Coefficient of Zener Voltage of Zener diode, makes Zener diode and commutation diode form mutual temperature-compensation circuit.Therefore, main capacitor charges to constant set voltage and not influenced by environment temperature etc.
In order to realize second purpose, the flash charging switch that comprises flasher circuit and flasher circuit is charged in flasher the invention is characterized in, comprises the display device that shows that the flasher circuit charging is finished, when the flash charging switch conducting, this display device is outwards outstanding.
Because when the flash charging switch conducting, the display device that the charging of demonstration flasher circuit is finished is outwards outstanding, is easy to so check whether flash charging switch is in the ON state.Therefore, when flasher circuit did not need to charge, the present invention can remind the cameraman to turn-off charge switch effectively.Therefore, flasher of the present invention has solved the problem that above-mentioned waste battery and photography subsequently can not be used flasher.
Brief description of drawings
Fig. 1 is the skeleton view of equipment lens-fitted photo film assembly of being furnished with the flasher of first embodiment of the invention;
Fig. 2 is the circuit diagram of the flasher of first embodiment of the invention;
Fig. 3 A and 3B are the sequential charts of showing the flasher operation of first embodiment;
Fig. 4 is the skeleton view of equipment lens-fitted photo film assembly of being furnished with the flasher of second embodiment of the invention;
Fig. 5 is the circuit diagram of the flasher of second embodiment of the invention;
Fig. 6 is a signal graph of showing the flasher charging operations of second embodiment;
Fig. 7 is furnished with the equipment lens-fitted photo film assembly of flasher of third embodiment of the invention at the skeleton view that does not use under the flasher state;
Fig. 8 is at the skeleton view that uses equipment lens-fitted photo film assembly shown in Figure 7 under the state of flasher;
Fig. 9 is the decomposition diagram of equipment lens-fitted photo film assembly shown in Figure 7;
Figure 10 is the decomposition diagram of equipment lens-fitted photo film assembly protecgulum shown in Figure 7;
Figure 11 is the circuit diagram of the flasher of the 3rd embodiment;
Figure 12 is the decomposition diagram of display device, and this device is used for showing the finishing and its installment state of flasher charging of the 3rd embodiment;
Figure 13 is the skeleton view of display device opposite side shown in Figure 12;
Figure 14 is that explanation is at the sectional view that does not use display device shown in Figure 12 under the state of flasher;
Figure 15 is illustrated in the sectional view that uses display device shown in Figure 12 under the flasher state;
Figure 16 is the skeleton view of presentation display device photoconduction part second example;
Figure 17 is a skeleton view of showing photoconduction part the 3rd example;
Figure 18 is a skeleton view of showing photoconduction part the 4th example;
Figure 19 is a skeleton view of showing photoconduction part the 5th example;
Figure 20 is a skeleton view of showing photoconduction part the 6th example;
Figure 21 is at the sectional view that does not use the essential part of finishing charging display device of not using photoconduction under the flasher state;
Figure 22 is at the sectional view that uses the essential part of finishing charging display device shown in Figure 21 under the flasher state;
Figure 23 is the circuit diagram of another embodiment of flasher; With
Figure 24 is the circuit diagram of common flasher circuit.
The preferred embodiment of invention
Below, illustrate in greater detail the present invention with reference to accompanying drawing.
With reference to Fig. 1, the component body 11 that comprises film is arranged hereinafter referred to as the equipment lens-fitted photo film assembly 10 of film assembly.Simple camera mechanism and flasher are loaded into component body 11.With decorating cardboard 12 package component bodies 11.Phtographic lens 13, view finder target window 14, frame counter window 15, film reel 16, the flash of light projector 17, shutter release button 18, charging operations parts or charge button 19 and other the necessary element opening by cardboard 12 is exposed or is fixed on the outside of cardboard 12.Form the display window that shows flasher preparation flash of light on the view finder eyepiece next door, but they are not shown in the drawings.
With reference to Fig. 2, Fig. 2 represents the flasher circuit of flasher, as long as push charge button 19, flash charging switch 26 is with regard to conducting so.In case flash charging switch 26 is by pushing 19 conducting a period of times of charge button, main capacitor 41 chargings during flasher circuit, even because of the cameraman stops to push after charge button 19 makes that flash charging switch 26 is turned off, flasher circuit still continues to make main capacitor 41 chargings until setting charging voltage.In case main capacitor 41 charges to setting voltage, after each flash of light, main capacitor 41 automatically charges to setting voltage immediately once more so.
Flasher circuit roughly is made up of stepup transformer part 20 and charging-discharge portion 40.The part of boosting 20 mainly by as 1.5V battery 21, NPN type oscillistor 22, oscillation transformer 23, positive-negative-positive locking transistor 24, charging current commutation diode 25, the flash charging switch 26 of power supply, recharge capacitor 27 and vibration halt circuit 35 constitutes.
Oscillation transformer 23 is made of primary coil 31, secondary coil 32 and the tertiary coil 33 of mutual inductive coupling.In oscillation transformer 23, the terminals of primary coil 23 are called as the first terminals 23a and the second terminals 23b, terminals of tertiary coil 33 are called as the 3rd terminals 23c, another terminals of tertiary coil 33 that also are terminals of secondary coil 32 are called as the 4th terminals 23d, and another terminals of secondary coil 32 are called as the 5th terminals 23e.Except the first terminals 23a to the, five terminals 23e, oscillation transformer 23 has tapping point 23f at the center section of secondary coil 32.
The first terminals 23a of oscillation transformer 23 is connected with the collector of oscillistor 22 and the positive pole of battery 21 respectively with the second terminals 23b.The 3rd terminals 23c is connected with the positive terminal of flash charging switch 26 with battery 21 by resistor 34a.The 4th terminals 23d is connected with the base stage of oscillistor 22, and the 5th terminals 23e is connected with the negative side of charging-discharge portion 40 by charging current commutation diode 25, and promptly the negative pole end with main capacitor 41 is connected.The negative pole of charging current commutation diode 25 is connected with the 5th terminals 23e.The emitter of oscillistor 22 is connected with the negative pole of battery 21 and ground connection.
Oscillistor 22 and oscillation transformer 23 constitute well-known squegger, and this oscillator becomes high voltage to the low voltage transition of battery 21, in order to main capacitor 41 is charged.When flash charging switch 26 conductings, oscillistor 22 is energized, and its collector current conducts to primary coil 31.When the base current of oscillistor 22 increased because of the positive feedback from oscillation transformer 23, its collector current increased, thereby oscillistor 22 vibrations.
In oscillistor 22 vibrations, according to turn ratio generation high voltage, for example alternating voltage of about 1000V of primary coil 31 with secondary coil 32.25 pairs of charging-discharge portions 40 of charging current commutation diode only are provided at those secondary currents that flow through secondary coil 32 from the direction of the 5th terminals 23e to the four terminals 23d.
After flash charging switch 26 turn-offed, the base stage of 24 pairs of oscillistors 22 of locking transistor applied bias voltage, thereby kept oscillistor 22 vibrations.The emitter of locking transistor 24 is connected with the positive pole of battery 21, and its base stage is connected with the collector of oscillistor 22 by resistor 34b, and its collector is connected with the base stage of tertiary coil 33 with oscillistor 22 by resistor 34a.
By this way, locking transistor 24 is connected in response to the excitation of oscillistor 22, thereby because of the positive feedback from locking transistor 24, even after flash charging switch 26 turn-offs, oscillistor 22 still continues vibration.Also can omit locking transistor 24.
When producing inverse electromotive force in tertiary coil 33, and flash charging switch 26 is when turn-offing, if there is not current loop or out of control to inverse electromotive force, the vibration of squegger will be unstable so, perhaps needs the main capacitor 41 that charges of longer time.For fear of this problem, be provided with loop diode 28.The positive pole of loop diode 28 is connected with the 3rd terminals 23c of tertiary coil 33 by resistor 34a, and its negative pole is connected with the positive pole of battery 21, thereby forms the current loop for inverse electromotive force on tertiary coil 33.
Charging-discharge portion 40 is made of main capacitor 41, strobo 42, trigger electrode 42a, neon lamp 43, triggering capacitor 44, triggering transformer 45, trigger switch 46 etc.Main capacitor 41 is connected in parallel with strobo 42.The positive terminal of main capacitor 41 also is connected with the negative pole of battery 21, and ground connection thus.The negative pole end of main capacitor 41 is connected with the positive pole of charging current commutation diode 25.In the present embodiment, the charging voltage of the setting of main capacitor 41 is 300V, makes when the voltage of 300V is applied on the strobo 42, and strobo 42 is with predetermined amount flash of light.Because the positive terminal of main capacitor 41 is connected with the negative pole of battery 21, so the maintenance of the current potential on main capacitor 41 positive terminals ground potential GND (=0V), thus the current potential on main capacitor 41 negative pole ends descends because of charging.In other words, charging voltage is to equal the positive terminal of main capacitor 41 and the absolute value of the potential difference (PD) between the negative pole end.
According to second embodiment, vibration halt circuit 35 is mainly by commutation diode 36, Zener diode 37 with stop transistor 38 and form.The negative pole of commutation diode 36 is connected with tapping point 23f, and the positive pole of commutation diode 36 is connected with the positive pole of Zener diode 37 by resistor 36a.Commutation diode 36 is used for rectification is carried out in vibration on the tapping point 23f or alternating voltage, only extracts alternating voltage is born half.Following detailed description, commutation diode 36 also has the function as Zener diode 37 temperature compensating elements.Capacitor 39 is used for the voltage of level and smooth commutation diode 36, and this voltage is applied on the Zener diode 37 as dc voltage.Stopping transistor 38 has the base stage that is connected with the negative pole of Zener diode 37 by resistor 37a, the emitter that is connected with the 4th terminals 23d of oscillation transformer 23 and the collector of ground connection.
Potential level Va on the tapping point 23f alternately changes according to the vibration of oscillation transformer 23.In addition, potential level Va on the whole with main capacitor 41 on the proportional change of charging voltage.Because main capacitor 41 charges on negative direction, so along with the increase of charging voltage, the current potential Va on the tapping point 23f descends in proportion.The position of tapping point 23f is arranged to, make potential difference (PD) or voltage " Vb-Va " between the 4th terminals 23d and the tapping point 23f reach given voltage Von, charge to simultaneously and set charging voltage for example after the 300V, in secondary coil 32, produce electromotive force at main capacitor 41.More particularly, the position of tapping point 23f is arranged to, and when the charging voltage on the main capacitor 41 reached setting value, the dc voltage that applies on the Zener diode 37 reached the Zener voltage Vz of Zener diode 37.
By providing voltage Von on the Zener voltage Vz, for example 10V that for example about 0.6V of the voltage drop amount of commutation diode 36 are added to Zener diode 37.In this case, the voltage Von of generation is 10.6V, and the number of turn between tapping point 23f and the 4th terminals 23d is that about 1/30 place of secondary coil 32 totals number of turns sets tapping point 23f.But if the Zener voltage Vz of Zener diode 37 is 30V, voltage Von is 30.6V just so, and the number of turn between tapping point 23f and the 4th terminals 23d is about 1/10 place setting tapping point 23f of secondary coil 32 totals number of turns.
According to above circuit structure, dc voltage is supplied with Zener diode 37, utilizing the alternating voltage between the 4th terminals 23d and the tapping point 23f is potential difference (PD) Vb-Va, obtains this dc voltage by commutation diode 36 and smmothing capacitor 39.Therefore, the Zener voltage Vz of Zener diode 37 can be lower, and for example 10V makes cheap Zener diode can be used as Zener diode 37.When main capacitor charged to the setting voltage of 300V, potential difference (PD) Vb-Va reached set-point Von, thereby Zener voltage Vz is applied on the Zener diode 37.Then, Zener diode 37 conduction and the rightabout Zener current of charging current.
Unless Zener diode 37 conduction Zener currents, otherwise in the base stage that stops transistor 38, do not have electric current to flow through, make that stopping transistor 38 is in the OFF state.When Zener diode 37 conduction Zener currents, promptly reach 0V when following when the negative pole current potential of Zener diode 37, voltage greater than the driving voltage that stops transistor 38 is applied on the emitter-base circuit that stops transistor 38, so that stop transistor 38 conductings.When stopping transistor 38 conductings, the base stage and the emitter of oscillistor 22 are connected to each other, and have identical potential level, make oscillistor 22 be cut off, thereby locking transistor 24 are cut off.
Because the coiler part between tapping point 23f and the 4th terminals 23d and the turn ratio of primary coil 31 are significantly less than the turn ratio of whole secondary coil 32 with primary coil 31, so can extract bigger electric current from tapping point 23f.Therefore, even when voltage decline from battery 21, for example owing to low environment temperature, still can be being enough to encourage the enough big base current that stops transistor 38 to offer the base stage that stops transistor 38.Therefore, the self-braking reliability of oscillistor 22 improves.
As known in the art, the conductance of semiconductor element changes according to its temperature.With regard to Zener diode, based on the setting Zener voltage of determining under the reference temperature, with the increase of temperature, Zener voltage increases or reduces.Specifically, its setting Zener voltage respectively has negative temperature coefficient less than those Zener diodes of 5 to 6V, thereby actual Zener voltage increases along with temperature and descends.On the contrary, its setting Zener voltage respectively has positive temperature coefficient greater than those Zener diodes of 5 to 6V, thereby actual Zener voltage increases and increases along with temperature.
Zener voltage Vz also changes according to environment temperature and because of the temperature variation that heat caused in the Zener diode 37.Because Zener voltage Vz is set to 10V in this case, so Zener diode 37 has positive temperature coefficient, thereby actual Zener voltage Vz increases and increases along with temperature.Under situation without any temperature compensation, when voltage Vb-Va rises to given voltage Von when above, promptly charge to setting value when above until main capacitor 41, Zener diode 37 all should conduct Zener current.
But those diodes that are used for rectification have negative temperature coefficient.Therefore, along with temperature increases, by the voltage drop decline of commutation diode 36, thereby the voltage that zener diode 37 applies increases.Therefore, the negative temperature coefficient of design commutation diode 36 compensates the positive temperature coefficient (PTC) of Zener diode 37.In other words, diode 36 and 37 total temperature coefficient are about zero.By this way, Zener current begins to flow under the charging voltage of the setting of main capacitor 41, and irrelevant with temperature variation.
Electric current charging in main capacitor 41 and triggering capacitor 44 from the part 20 of boosting.When main capacitor 41 charged to the setting voltage of its 300V, neon lamp 43 beginnings were luminous.Conduct near the eyepiece display window from the light of neon lamp 43 by unshowned photoconduction etc., prepare flash of light so the cameraman can see flasher.
When blade is opened, trigger switch 46 conductings.Then, trigger the primary coil 45a discharge of 44 pairs of triggering transformers 45 of capacitor.As a result, respond to for example high pressure trigger voltage of 4KV in the secondary coil 45b of transformer 45, this voltage is applied on the trigger electrode 42a.High voltage makes the xenon ionization in the strobo 42, and the resistance between its electrode is punctured, and makes main capacitor 41 discharges to cause strobo 42 flashes of light.
The secondary current that utilizes secondary coil 32 by the mode identical with main capacitor 41 charge boost part 20 recharge capacitor 27.When strobo 42 flashes of light, be loaded into the charge discharge that recharges in the capacitor 27, flow into the base stage of oscillistor 22, make oscillistor 22 conductings to begin the main capacitor 41 that charges once more.
Below, the operation of above embodiment is described.At first, the cameraman rotates the film rotor wheel 16 of film assembly 10, makes film be licked a frame, and makes the shutter perk.Strobo photography is pushed charge button 19 so if desired, connects flash charging switch 26.Just pressed this button fully, the cameraman just can stop to push charge button 19.
When flash charging switch 26 conductings, base current is applied on the oscillistor 22 by resistor 34a and tertiary coil 33.The excited oscillation transistor 22 thus, conduct the collector current identical with base current.When collector current from the second terminals 23b when primary coil 31 flow to the first terminals 23a, collector current equals primary current.
Because this primary current so produce high-tension electromotive force in secondary coil 32, makes secondary current flow to the 4th terminals 23d from the 5th terminals 23e.Secondary current flows into the base stage of oscillistor 22, thereby base current increases.When base current increased, collector current promptly increased by the primary current of primary coil 31.
When oscillistor 22 conductings, the electric current that flow to oscillistor 22 collectors also is applied on the base stage of locking transistor 24, thus 24 conductings of locking transistor.Then, the voltage of battery 21 begins to be applied on the base stage of oscillistor 22 by resistor 34a and tertiary coil 33.
Because from the positive feedback of oscillation transformer 23, so the collector current of the base current of oscillistor 22 and oscillistor 22 increases simultaneously.But when oscillistor 22 reached capacity, the collector current increase seldom.Therefore, the variation of primary current diminishes, and produces inverse electromotive force on each coil 31 to 33 of oscillation transformer 23.Because this inverse electromotive force, so descend from the electric current of secondary coil 32 flow direction oscillation transistors 22 base stages.Therefore, the collector current of oscillistor 22 descends.
But, because locking transistor 24 provides the base voltage of oscillistor 22, so oscillistor 22 does not end fully.After inverse electromotive force on oscillation transformer 23 stops, the collector current of oscillistor 22 is increased once more from the base voltage of locking transistor 24.Therefore, primary current begins to increase once more.Like this, even after flash charging switch 26 turn-offs, oscillistor 22 or squegger still continue vibration.
The high-tension electromotive force that utilizes the duration of oscillation to respond in secondary coil 32 produces secondary current.In secondary current, offering charging-discharge portion 40 to those mobile electric currents of the direction of the 4th terminals 23d by charging current commutation diode 25 from the 5th terminals 23e, and to main capacitor 41 and 44 chargings of triggering capacitor.Simultaneously, charge to recharging capacitor 27 with this secondary current.
Shown in Fig. 5 A, suppose ground potential GND on battery 21 negative poles be reference level (=0V), potential level Vb on the 4th terminals 23d maintains on the constant level, this constant level exceeds the base-emitter voltage of oscillistor 22 than ground potential GND, and when charging voltage is around the 0V, on the oscillation transformer 23 of the charging first order, produce electromotive force.When producing inverse electromotive force, the potential level on the 4th terminals 23d resembles and descends the pulse.
When producing electromotive force, the potential level Va of tapping point 23f keeps constant, and when the generation inverse electromotive force, then resembles transition the pulse.In any phase place, potential level Va is greater than the potential level Vb of the 4th terminals 23d.Therefore, in the first order of charging, apply potential difference (PD) Vb-Va in opposite direction on commutation diode 36, making does not have current direction Zener diode 37, thereby does not have current direction to stop the base stage of transistor 38, stops transistor 38 not conductings.
When main capacitor 41 chargings, the voltage on the main capacitor 41 increases.In the present embodiment, main capacitor 41 is designed to charge on negative direction, and the positive terminal of main capacitor 41 is kept 0V, and the potential level of the negative pole end of main capacitor 41 descends.As a result, the load on the secondary coil 32 increases, and makes secondary current reduce, and electromotive force voltage on the secondary coil 32 and inverse electromotive force voltage descend.In addition, the oscillation frequency of squegger rises.
Become more in short-term when the change cycle of potential level Va, potential level Va is whole to descend.On the other hand, although period of change shortens by the mode identical with potential level Va, the potential level Vb of the 4th terminals 23d still changes between the level identical with the charging first order.Therefore, potential level Va is lower than potential level Vb, produces electromotive force simultaneously, makes voltage begin to be applied on the Zener diode 37.But, reaching predetermined value until the charging voltage of main capacitor, potential difference (PD) Vb-Va is less than given voltage Von, thus the voltage that imposes on Zener diode 37 is less than Zener voltage Vz.Therefore, charge to the setting charging voltage until main capacitor 41, Zener diode 37 just conducts Zener current, stops transistor 38 just conductings.By this way, oscillistor 22 continues vibration, charges to the setting charging voltage until main capacitor 41.
Shown in Fig. 3 B, when main capacitor 41 charged to setting voltage, when promptly being 300V in the present embodiment, potential difference (PD) or voltage Vb-Va reached given voltage Von, and promptly 10.6V produces electromotive force simultaneously.Then, Zener voltage Vz is applied on the Zener diode 37 by commutation diode 36, and Zener current flows through Zener diode 37.Because this Zener current, so electric current flows to the base stage that stops transistor 38 from the 4th terminals 23d, conducting stops transistor 38.Certainly, voltage Vb-Va changes according to the vibration of squegger, before zener diode 37 applies, make this voltage commutation and level and smooth through commutation diode 36 and smmothing capacitor 39, thereby conducting stably stops transistor 38.
When stopping transistor 38 conductings, the base stage of oscillistor 22 makes oscillistor 22 end by stopping the emitter that transistor 38 is connected to self.When oscillistor 22 ended, the base current of locking transistor 24 stopped, thereby locking transistor 24 ends.Like this, oscillistor 22 does not continue vibration, thereby stops to charge main capacitor 41.When charging stops, stopping transistor 38 and end.Even when stop transistor 38 by the time, oscillistor 22 still can not restart vibration.
In addition, when main capacitor 41 charged to setting voltage, neon lamp 43 beginnings were luminous, prepared flash of light so the cameraman can see flasher.Then, the cameraman can push shutter release button 18, carries out strobo photography, finds a view by view finder simultaneously.
When pushing shutter release button 18, shutter is energized, instantaneous trigger switch 46 conductings of opening fully at shutter.In case trigger switch 46 conductings trigger capacitor 44 discharges, make electric current flow through the primary coil 45a that triggers transformer 45, respond to trigger voltage on secondary coil 45b.This trigger voltage is applied on the strobo 42 by trigger electrode 42a.Then, main capacitor 41 makes strobo 42 flashes of light by strobo 42 discharges.So the flash of light projector 17 projection lights are finished strobo photography.
Because the mutual temperature compensation function of Zener diode 37 and commutation diode 36, so main capacitor 41 charges to setting voltage under the situation of charging voltage without any variation.Therefore, strobo photography is always finished under the amount of flash of constant.
Side by side luminous with strobo 42, recharge capacitor 27 by strobo 42 discharges.Flow into the base stage of oscillistor 22 from the discharge current that recharges capacitor 27.Thus, oscillistor 22 is encouraged once more.When oscillistor 22 is encouraged once more, as 26 conducting a period of times of flash charging switch, 24 conductings of locking transistor.Locking transistor 24 makes oscillistor 22 continue vibration.By this way, main capacitor 41 begins charging once more.
The following describes the flasher circuit of second embodiment, its basic structure is identical with the structure of first embodiment, and wherein, identical reference number is represented identical or corresponding part.The following description only relates to the essential part of second embodiment.
Fig. 5 represents the flasher circuit that is provided with in the film assembly shown in Figure 10.The part of boosting 20 is provided with flash charging switch 51, conducting when this switch is in the ON position at charging operations parts 50, and when charging operations parts 50 are in the OFF position, turn-off.Different with above embodiment, the part of boosting 20 does not have locking transistor 24, loop diode 28, recharges capacitor 27 and smmothing capacitor 39.When flash charging switch 51 conductings, electric current flows into the base stage of oscillistor 22, make oscillistor 22 vibrations, and main capacitor 41 utilizes the high-voltage charge that produces by oscillation transformer 23.In other words, when flash charging switch 51 is in the ON state, the squegger work of forming by oscillistor 22 and oscillation transformer 23.
Replace neon lamp, light emitting diode (LED) 52 is connected between the 3rd terminals 23c and the 4th terminals 23d of oscillation transformer 23, is used to show that the charging of main capacitor 41 finishes.The positive pole of LED 52 is connected with the 4th terminals 23d, begins luminous when charging to setting voltage with convenient main capacitor 41.In JPA8-115796, disclosed the details of LED 52.
By the mode identical with above embodiment, vibration halt circuit 35 comprises commutation diode 36, the Zener diode 37 that tapping point 23f, resistor 36a and the 37a with secondary coil 32 is connected in series and stops transistor 38, but also comprises stopping capacitor 53.Have, in the present embodiment, commutation diode 36 and Zener diode 37 are formed mutual temperature-compensation circuit again.
Because flash charging switch 51 is kept the ON state when charging main capacitor 41, so if stop only short time conducting of transistor 38, oscillistor 22 can always not be energized so.In order to ensure oscillistor 22 failures of oscillations when main capacitor 41 charges to setting voltage, stopping capacitor 53 directly is connected between the 4th terminals 23d of the negative pole of Zener diode 37 and oscillation transformer 23.When main capacitor 41 charges to setting voltage, by flowing through Zener diode 37 with the described identical mode Zener current of Fig. 4 second embodiment.But Zener current flows through stopping capacitor 53 along the direction from the 4th terminals 23d to tapping point 23f, and is feasible directly with Zener current charging stopping capacitor 53, in other words, charges under the situation without any the interlaminated resistance device.Therefore, stopping capacitor 53 just is charged to suitable full voltage at for example about 10ms of moment (millisecond).
As shown in Figure 6, after the charging voltage of main capacitor 41 reaches setting value, when Zener current flows through stopping capacitor 53 immediately, stop the base-emitter voltage vanishing volt of transistor 38, make to stop transistor 38 not conductings.When stopping capacitor 53 chargings, the charging voltage of stopping capacitor 53 is applied on the base-emitter circuit that stops transistor 38, make from stopping capacitor 53 through stopping transistor 38 base stage and emitter to the closing of circuit of resistor 37a, thereby stopping capacitor 53 discharges.Discharge current flows in the base stage that stops transistor 38, so conducting stops transistor 38.As a result, begin to flow through the emitter-collector circuit that stops transistor 38 from the electric current that battery 21 has offered oscillistor 22 base stages, make oscillistor 22 stop excitation, interrupt the charging of main capacitor 41 by flash charging switch 51.
Discharge by resistor 37a is used for providing electric current to the base stage that stops transistor 38 for a long time.As long as base current is provided, stop transistor 38 with regard to conducting.Therefore, stop enough conductings for a long time of transistor 38, but the just vibration of failure of oscillations transistor 22.The ON cycle that stops transistor 38 can be set by adjusting by the electric capacity of stopping capacitor 53 and the definite time coefficient of resistance value of resistor 37a.In the present embodiment, the electric capacity of stopping capacitor 53 is 47 μ F, and the resistance value of resistor 37a is 10K Ω, thereby in actual measurement, setting the ON cycle that stops transistor 38 is 0.3 second.According to such structure, even when flash charging switch 51 is in the ON state, oscillistor 22 is also used the failure of oscillations in 0.3 second at least.
When stopping capacitor 53 discharges, the charging voltage of stopping capacitor 53 descends gradually.When the charging voltage of stopping capacitor 53 reaches predetermined value when following, stop transistor 38 and end.As long as flash charging switch 51 is in the ON state, just restart to flow into the base stage of oscillistor 22 from the electric current of battery 21, make oscillistor 22 restart vibration.Because main capacitor 41 has charged to setting voltage, so in case vibration restarts, Zener current just flows through Zener diode 37.When finishing and subsequently when beginning to discharge, utilize discharge current to come conducting to stop transistor 38 in the short time after restarting to vibrate with very fast stopping capacitor 53 is charged fully of Zener current.Interrupt the charging of main capacitor 41 thus immediately.
By as above such identical mode, stop transistor 38 conducting repeatedly and end, oscillistor 22 is repeatedly stopped and restarting vibration.Therefore, as long as flash charging switch 51 is in the ON state, main capacitor 41 just repeats and charging off and on so, replenishes discharging naturally of main capacitor 41, thus constant keep the charging voltage of main capacitor 41.
In charging-discharge portion 40, trigger the terminals of capacitor 44 and the common terminal of primary coil 45a and secondary coil 45b and be connected with the positive pole of battery 21, flash selection switch 54 is connected in series with triggering capacitor 44.By charging operations parts 50 being set in ON position or OFF position respectively, flash selection switch 54 is with flash charging switch 51 conducting as one man or end.
According to this structure, when flash selection switch 54 is in the ON state, triggers capacitor 44 usefulness and divide 20 current charges, and when trigger switch 46 conductings, discharge from boosting section.Then, trigger voltage is applied on the strobo 42.Even when main capacitor 41 charges fully, if flash selection switch 54 is in the OFF state, triggers capacitor 44 so and can not discharge, make flashlamp not glisten.
Along with the charging of main capacitor 41, the current potential of the 3rd terminals 23c descends gradually.At last, in the phase place that does not produce inverse electromotive force, the current potential of the 3rd terminals 23c becomes less than the current potential of the 4th terminals 23d.Then, this voltage is applied on the LED 52 along its positive dirction.In the present embodiment, when the charging voltage on the main capacitor 41 reaches 250V when above, the potential difference (PD) between the 3rd terminals 23c and the 4th terminals 23d becomes big like this, makes that LED 52 is luminous with visible brightness.When main capacitor 41 charged to the setting voltage of 300V, it is big that the potential difference (PD) between the 3rd terminals 23c and the 4th terminals 23d becomes, and is enough to make LED 52 by predetermined high brightness luminescent.
LED 52 stops luminous when stopping transistor 38 conductings.Therefore, the interruption that limits LED 52 by the time identical with the turn-on cycle that stops transistor 38 at interval wherein limits the turn-on cycle that stops transistor 38 by adjusting the time coefficient of being determined by the resistance value of the electric capacity of stopping capacitor 53 and resistor 37a.For example, if directly in the flasher circuit by the Zener current conducting LED is set stopping transistor, the luminous interruption of LED greatly changes because of the variation meeting of the leakage current of environment temperature, main capacitor, single Zener diode performance etc. at interval so.According to structure shown in Figure 5, LED 52 can be luminous by the interval of rule.
Between the negative pole of Zener diode 37 and the 4th terminals 23d, can be provided with above-mentioned flasher circuit shown in Figure 2 in the identical stopping capacitor of stopping capacitor.Therefore, stop transistor 38 and will not be subjected to the influence of issuable electrical noise when main capacitor 41 almost charges to setting voltage, and with the sufficiently long time of conducting, to stop the charging of main capacitor 41.
Use the vibration halt circuit 55 of stopping capacitor 53 to be preferably used in the flasher circuit that needs maintenance pushing charge button to continue charging.The main capacitor although the foregoing description charges on negative direction, the present invention is used in those flasher circuits of charging main capacitor on the positive dirction.Under the sort of situation, the current potential of the tapping point on the oscillation transformer secondary coil centre position along with main capacitor on charging voltage increase and increase.Therefore, commutation diode and Zener diode should be connected tapping point and stop between the transistorized base stage by polarity in contrast with the previous embodiment.
In needing only the flasher of flash charging switch conducting flasher with regard to these types of recharge, such with embodiment shown in Figure 4, if the cameraman forgets the charging operations parts because of carelessness and is in the ON position, battery can consume gradually before all effective picture frame photographies so, and strobo photography becomes and can not carry out.Only the cameraman checks the charging operations position component or shows the display light that charging is finished when photography finishes, and just can avoid this situation.But not obvious or show under the unconspicuous situation of display light that charging finishes at the on off state of charging operations parts, the cameraman may forget the charging operations device is reset to the OFF position.When the cameraman was unfamiliar with the film assembly, this trouble more may occur.Following embodiment can prevent effectively that the cameraman from forgetting the shutoff flash charging switch.
Fig. 7 is illustrated in the outward appearance of film assembly 10 under the state that flashlamp do not glisten.In the face side of film assembly 10, there are camera lens 13, view finder target window 14, the flash of light projector 17, charging operations parts 56 and the visual field to change button 57.In the top side of film assembly 10, shutter release button 18, frame counter window 15 and opening 61 are arranged, by this opening, charged state display 60 can expose as shown in Figure 8.As shown in Figure 9, in the rear side of film assembly 10, film reel 16, view finder eyepiece window 14c and other element are arranged.
As shown in Figure 9, module body 3 is made up of essential part 68, protecgulum 71 and bonnet 72, essential part 68 comprises photographic film cassette 67, exposure assembly 69 and flasher 70, these parts are fixed on the front of essential part 68, protecgulum 71 covers the front of essential part 68, and bonnet 72 covers the back side of essential part 68.These parts mesh by buckle-type and assemble.
Essential part 68 has the exposure room 74 that is positioned at its center, in exposure room 74 both sides the box chamber 75 and the film chamber 76 of fixed bin shell 66 and unexposed film 65 respectively, these parts are used as integral body and form.Exposure room 74 has the exposure hole 74a that limits exposed frame zone on the film 65.In the present embodiment, film loader 67 is IX 240 types, so the exposed frame zone is wide observation size (aspect ratio 1.8).
On box chamber 75, film roll driving wheel 16 and light shield lid closing organ 77 is installed.Film roll driving wheel 16 and light shield lid closing organ 77 are by the spool 66b and the light shield lid 66a engagement of the roof and the box shell 66 of box chamber 75.After the whole length of film 65 was wound in the shell box 66, when dismantling box shell 66 from film assembly 10, light shield lid closing organ 77 was closed light shield lid 66a.
Around shut-down mechanism, frame count mechanism, camera lens 13 and finder optical system 111a and 111b (referring to Figure 12) and expose other element required and constitute, these elements are installed on the base block part 85 exposure assembly 69 by shutter charging mechanism, shutter releasing mechanism, film roll.Exposure assembly 69 is fixed on the front of exposure room 74.
Flasher 70 is made up of the circuit board 87 that is printed with contact chip 87a, 87b and 87c thereon, the flash of light projector 17, main capacitor 41, synchro switch 46, a pair of contact zones 92a that is used for battery 21 and 92b, Metal Contact blade 93 and other element of constituting flasher circuit.Metal Contact blade 93 is placed on 76 fronts, film chamber, thereby when charging operations parts 56 were set in the ON position, Metal Contact blade 93 contacted with contact chip 87a to 87c.Thus, the flasher circuit main capacitor 41 that begins to charge.On circuit board 87, install mainly by strobo 42 (referring to Figure 11), fixedly strobo 42 carriage 89 and spread the flash of light projector of forming from the diffuser plate 90 of the light of strobo 42 17.The releasing operation conducting as one man of the shutter releasing mechanism of synchro switch 46 and exposure assembly 69.
As shown in figure 10, protecgulum 71 is made up of protecgulum main body 95 and the header board 96 that is fixed on protecgulum main body 95 fronts.Protecgulum main body 95 has on shape and size and passes the roughly the same opening 14b of opening 14a that header board 96 forms, and is provided with opening 14a with aiming at.Opening 14a and 14b form view finder target window 14.The charging operations parts 56 and the visual field change plate 82 and are installed between header board 96 and the protecgulum main body 95.
The visual field changes plate 82 round center hole 102 that is installed on the barrel 99, and making the visual field change plate 82 can be around the optical axis rotation of camera lens 13.The visual field changes plate 82 and is promoted by collar spring 105, goes up rotation in the clockwise direction or counterclockwise.The coiling end 105a of collar spring 105 is installed on the pin 103 that forms on the protecgulum main body 95, and the other end 100b of collar spring 105 inserts in the aperture 104 of visual field change plate 82.Projection 106 is integrally formed on the preceding lower part of visual field change plate 82.In the deep-slotted chip breaker 58 that projection 106 lens hoods 97 that are inserted in header board 96 form below.Visual field release knob 57 is connected on the projection 106 from the front.
The visual field changes plate 82 has panorama size visual field window 112 (aspect ratio 3.0) and common size visual field window 113 (aspect ratio 1.5) at its peripheral part, and is arranged on the otch 114 between these windows 112 and 113.Change button 57 by the operation visual field, the rotation visual field changes plate 82, and one of them that makes panorama size visual field window 112, common size visual field window 113 and otch 114 is in the view finder target window 14.In this film assembly 10, each picture frame is by wide observation size record, so that view finder target window 14 and view finder eyepiece window 14c be set at first be wide observation size visual field and when otch 114 is in the view finder target window 14, provide wide observation size visual field.When common size visual field window 113 inserted view finder target window 14, the visual field just was defined in common size.When panoramic view window 112 inserted in the view finder target window 14, the visual field just was defined in-the panorama size.
In the neighboring area around the circular port 102, form cam path 116.Cam path 116 is accepted pin 117a, wherein forms this pin on the point of the arm 117 that is installed on the swingle 83 above the exposure room 74.Therefore, swingle 83 rotates with the motion that the visual field changes button 57.Although at length do not illustrate among the figure, below the exposure room 74 of light shielding plate 81 back, be provided with and be used on film 65 photorecording and print a pair of data recording hole of formatted data, be used to open or close the data switch plate in one or two data recording hole and light be sent to the photoconduction in data recording hole from data recording photocell 136 (referring to Figure 11).Data recording light-emitting component 136 is installed on the flasher 70, comes luminous according to each shutter release operation.Another arm 118 of swingle 83 and data switch plate coupling make that data switch plate moves when swingle 83 rotates because of the rotation of visual field change plate 82.As a result, two or a data register hole are closed or are opened so that according to the visual field, the outside, exposed frame zone on film 65, be recorded to many 2 as printing formatted datas.According to printing formatted data, with the photograph of visual field same size, for example panorama size photograph is made by wide observation size picture frame.
Figure 11 is illustrated in the flasher circuit that forms on the circuit board 87.Flasher circuit is the automatic charge type circuit that resembles embodiment illustrated in fig. 5, mainly is made up of the recording lamp part 133 that comprises data recording light-emitting component 136, the part of boosting 20 and charging-discharge portion 40.Data recording light-emitting component 136 is luminous when each conducting of synchro switch 46, and is irrelevant with strobo 42.
Roughly by mode same as the previously described embodiments, the part of boosting 20 by battery 21, oscillistor 22, oscillation transformer 23, commutation diode 25, stop transistor 38 and show that light-emitting component 141 forms.Charging-discharge portion 40 also has the structure roughly the same with the foregoing description, and is made up of main capacitor 41, strobo 42, trigger electrode 42a, triggering capacitor 44, triggering transformer 45, synchro switch 46, flash charging switch 51, flash selection switch 54 etc.Main capacitor 41 is connected in parallel with strobo 42, and is connected with the negative pole of commutation diode 25 on its negative pole.
Oscillistor 22 and oscillation transformer 23 are formed well-known squegger circuit, this oscillator starting oscillation when flash charging switch 51 conductings.When oscillistor 22 vibrations, on the secondary coil 32 of oscillation transformer 23, respond to the high-voltage alternating electric current according to the secondary coil 32 and the turn ratio of primary coil 31.Electric current from secondary coil 32 is applied on charging-discharge portion 40 by commutation diode 25.
The base stage that stops transistor 38 is connected with Zener diode 37.When main capacitor 41 charges to given voltage, Zener diode 37 conduction Zener currents.The Zener current conducting stops transistor 38, thereby by oscillistor 22.When main capacitor 41 charges to setting voltage, show that light-emitting component 141 beginnings are luminous.
Flash selection switch 54 turn-offs or connects by triggering capacitor 44, the primary coil 45a that triggers transformer 45 and the discharge circuit that synchro switch 46 is formed.Flash selection switch 54 also is connected with charging circuit, in order to charging main capacitor 41 and triggering capacitor 44.Therefore, the shutoff of flash selection switch 54 prevents to trigger capacitor 44 discharges, also prevents main capacitor 41 and triggers capacitor 44 chargings.Flash charging switch 51 and flash selection switch 54 have public negative pole end.
After the flash of light projection, as long as flash charging switch 51 and flash selection switch 54 are ON, so above-mentioned flasher circuit just automatically restarts charging.Even after main capacitor 41 charges fully, if flash charging switch 51 and flash selection switch 54 are ON, the squegger circuit just automatically restarts vibration when the voltage of each main capacitor 41 drops to the setting charging voltage so.Therefore, main capacitor 41 repeatedly charges, and shows that light-emitting component 141 is luminous constantly.
Base plate 121 has vertical channel 126, is used to accept to be formed on the pin 127 on the antetheca of protecgulum main body 95.Groove 126 has two not shown recesses, pin 127 and one of them recess pairing when upwards sliding into the ON position or sliding into the OFF position downwards with convenient charging operations parts 56.Therefore, charging operations parts 56 remain on ON position or the OFF position.Form narrow groove 128 on groove 126 next doors, in order to provide elasticity to groove 126.
To shown in Figure 15, charged state display 60 is made by transparent plastic material, comprises the mounting portion 161 that has mounting sleeve 160 and utilizes the photoconduction part 162 of internal reflection conduction from the light that shows light-emitting component 141 as Figure 12.As shown in figure 12, charged state display 60 is fixed on the camera lens bracket portion 163, and the latter integrally forms with the base block part 85 of exposure assembly 69, and supports finder optical system 111a and 111b.The supporting guide 165 that camera lens bracket portion 163 has guide pin 164 and is integrally formed therewith.Mounting sleeve 160 is disposed on the guide pin 164, and supporting guide 165 supports the back side of photoconduction part 162.The flange 166 that is used for fixing mounting portion 161 is formed on the lower end of the guide pin 164 that is integrally formed therewith.
Below, the operation of the film assembly 10 that brief description is shown in Figure 7.
At first, the rotation visual field changes button 57, to pass through that one of panorama size visual field window 112, common size visual field window 113 and otch 114 of visual field change plate 82 are inserted view finder target window 14, between big visual field size, panorama size and common size, change the visual field, each picture frame is distributed the corresponding form of printing.Change plate 82 with the visual field and rotate swingle 83 ordinatedly, data switch plate is slided into the back of light shielding plate 81.Therefore, several points of destination corresponding with the visual field can be used as and print formatted data and be recorded on the film 65.
When carrying out strobo photography, the ON position of charging operations parts 56 above following OFF position slides into.When charging operations parts 56 were in the OFF position, charged state display 60 was as Fig. 7 and be positioned at film assembly 10 inside as shown in Figure 14.Along with charging operations parts 56 slide into the ON position, move up along groove 122 with the mate 124 of the charging operations parts 56 of pin 123 engagement of charged state display 60.Thus, as Fig. 8 and shown in Figure 15, charged state display 60 moves up along guide pin 164 and supporting guide 165, by opening 61 170 outsides of giving prominence at film assembly 10 is held in the light projection.Simultaneously, first reflecting surface 168 is in the face of showing light-emitting component 141.
When charging operations parts 56 are in the ON position, recess in the groove 126 of the base part 121 of charging operations parts 56 cooperates with pin 127 on the protecgulum main body 95, and the projection that forms on button part 120 back sides of charging operations parts 56 is by the Metal Contact blade 93 of the opening 88 pushing flashers 70 of protecgulum main body 95.Therefore, the 93a to 93c of contact tip portion contacts with the contact chip 87a to 87c of circuit board 87, conducting flash charging switch 51 and charging option switch 54.As a result, the squegger starting oscillation of forming by oscillistor 22 and oscillation transformer 23.
The high-tension current that the duration of oscillation is flow through secondary coil 32 is applied on charging-discharge portion 40 by commutation diode 25, makes main capacitor 41 and triggers capacitor 44 chargings.When the voltage on the main capacitor 41 reached the setting charging voltage, Zener current flow through Zener diode 37, thereby conducting stops transistor, stopped charging.
When main capacitor 41 charges to the charging voltage of setting, show light-emitting component 141 conductings.Light from demonstration light-emitting component 141 holds 170 by the projection of photoconduction part 162 lead-in lights, and passes through the place ahead and the rear of the reflection while directive film assembly 10 of reflecting surface 170a and 170b.Therefore, when flasher 70 chargings finished, cameraman and actor or actress being shot can see simultaneously.Owing to conduct to finder optical system 111a and 111b from the light that shows light-emitting component 141 by second reflecting surface 169 and the 3rd reflecting surface 171, finish so the cameraman can confirm charging when finding a view.
When the cameraman pushed shutter release button 18, the tripper of exposure assembly 19 was released, and synchro switch 46 discharges conducting as one man with shutter.As a result, strobo 42 is by flash selection switch 54 discharges, thereby flash of light is from the flash of light projector 17 directive photography targets.Light by the photography target reflection focuses on the film 65 by phtographic lens, writes down a picture frame.When synchro switch 46 conductings, data recording light-emitting component 136 is the conducting regular hour also, printing the blank space of formatted data photorecording at the picture frame of film 65.
In order under the situation that does not have flash of light, to photograph, when charging operations parts 56 are arranged on the OFF position, push shutter release button 18.In case synchro switch 46 discharges conducting as one man with shutter, flasher 70 does not glisten at that time, but data recording light-emitting component 136 conducting certain hours.Thus, printing the data of form as one man is recorded on the film 65 by photography with the field size of selecting at that time.
After exposure, by charging operations parts 56 are set in the ON position, flasher 70 automatically begins to be exposure charging next time.As long as charging operations parts 56 are in the ON position, and flash charging switch 51 and flash selection switch 54 still be in the ON state, even so after charging main capacitor 41 is finished, intermittent oscillation circuit still works on, and it is luminous to show that light-emitting component 141 continues.Therefore, know easily whether charging operations parts 56 are in the ON position, thereby when not needing to charge, charging operations parts 56 are reset to the OFF position and can not lose efficacy.By this way, film assembly 10 shown in Figure 7 has solved waste battery 21, makes the problem that battery 21 consumes gradually and flasher 70 is no longer worked.
In above embodiment, although the reflecting surface 170a and the 170b of the light of charged state display 60 projection end 170 are arranged in the recess that forms on photoconduction part 162 upper ends, but as shown in figure 16, can directly reflective surface 170a and 170b be set in the upper end of photoconduction part 162.
As shown in figure 17, charged state display 60 also can dispose towards the tapered light projection of upper prong part 180, or as shown in figure 18, charged state display 60 configuration is tapered and fluted 181 light projection part 182 around it towards upper prong, or as shown in figure 19, charged state display 60 configuration is tapered and the light projection part 184 of recess 183 is arranged in upper prong portion towards upper prong.
In addition, as shown in figure 20, charged state display 60 can dispose by centered cylinder part 186 and radial slot 187 and be formed on the light projection part 189 that column part 186 diametral rib 188 on every side constitutes.The shape of the light of charged state display 60 projection part should not be subject to the shape shown in the figure, as long as can projection light, makes cameraman and actor or actress being shot see light from display light radiated element 141 simultaneously, and various modifications can.
In above embodiment, make charged state display 60 by the transparent plastic material of for example polystyrene and so on.But can also make charged state display 60 with translucent or colourful transparent plastic material or glass.Can also make charged state display 60 with achromatic transparent material or trnaslucent materials, and make demonstration light-emitting component 141 projection coloramas.Have, the translucency plastic material that is mixed with light diffusing agent can be used to make charged state display 60 again.Can make charged state display 60 integratedly with charging operations parts 56.
In above embodiment, constitute the device that shows that charging flasher 70 is finished by demonstration light-emitting component 141 on the circuit board 87 that is fixed in flasher 70 and charged state display 60, wherein this charged state display 60 has guiding from the photoconduction part 162 of the light that shows light-emitting component 141 and give prominence to outside at film assembly 10 slidably.As shown in figure 21, also can be with showing that light-emitting component 141 and the fixing carriage 190 of light-emitting component 141 that shows constitute the device that shows that charging is finished.Carriage 190 is made by transparent plastic material, with 56 couplings of charging operations parts, so that as shown in figure 22, by charging operations parts 56 are slid into the ON position, makes the upper cover part 190a of carriage 190 give prominence to outside at film assembly 10.With with above embodiment in identical reference number represent components identical, thereby omit the explanation of these elements.
The terminals 141a and flash circuit board 87 Elastic Contact that show light-emitting component 141, when carriage 190 moved up with charging operations parts 56, these terminals contacted with conductive surface 192 on being formed on flash circuit board 87.Because electric current flows through conductive surface 192 when charging is finished, so show that light-emitting component 141 is luminous at that time.From the loam cake 190a emission that the light that shows light-emitting component 141 passes carriage 190, feasible people who is photographed and cameraman notice to charge and finish.
According to embodiment shown in Figure 21, show that light that charging is finished has brightness bigger when launching by photoconduction than light.Therefore, can see charged state apart from certain distance.The terminals 141a and the conductive surface 192 that show light-emitting component 141 can also be as the power switches of flasher circuit.
Replace being furnished with the demonstration light-emitting component 141 of the terminals 141a that when carriage 190 moves up, contact, demonstration light-emitting component 141 can be passed through the flexible cloth tape and be connected with flasher circuit on the circuit board 87 with the conducting surface 192 of flash circuit board 87.Wiring tape should have the length that allows demonstration light-emitting component 141 to move with carriage 190.
Show that above-mentioned any device that charging is finished all has simple structure, and can be with low-cost production.
Figure 23 represents the improvement to flasher circuit shown in Figure 5.In flasher circuit shown in Figure 23, constitute by elastic conduction metal blade 195 and first to the 3rd contact chip 196a, 196b and 196c as the dual-switch part of flash charging switch and flash selection switch.On flash circuit board, form contact chip 196a to 196c.Conducting metal blade 195 has the free end that is branched into two point 195a and 195b, and is welded on the stiff end 196c on the 3rd contact chip 196c.Under the situation without any load, free end 195a and 195b break away from flash circuit board.When charging operations parts 50 slid into the ON position, charging operations parts 50 were pushed conducting metal blade 195, and free end point 195a is contacted with the second contact chip 196b with the first contact chip 196a with 195b.Therefore, switch sections is that flash charging switch and flash selection switch are maintained at the ON position.
In above embodiment, the bifurcated free end 195a and the 195b of metal blade 195 guarantees to contact with second the tight of contact chip 196b with the first contact chip 196a, thereby guarantees the electrical connection between the contact chip 196a to 196c.But as long as metal blade 195 is can make the first contact chip 196a to the, three contact chip 196c be electrically connected to each other the time, the free end of metal blade 195 just needn't bifurcated so.Metal blade 195 can be fixed among the first contact chip 196a to the, the three contact chip 196c any one.Metal blade 195 is separated with among the contact chip 196a to 196c any one, metal blade 195 is contacted with contact chip 196a to 196c, can effectively reduce the probability that contact was lost efficacy on the contact chip though resemble the present embodiment end of metal blade is fixed on.
Flasher circuit shown in Figure 23 can be used for film assembly shown in Figure 7.In this case, similar to recording lamp part shown in Figure 11 133 data recording circuit should be attached on the flasher circuit shown in Figure 23.In addition, can provide the flasher that does not have the film of data recording function assembly flasher circuit shown in Figure 23 and charging operations parts 56 and 60 combinations of charged state display shown in Figure 10.In this replacement, when charging operations parts 56 slided into the ON position, hard contact 195 was connected to each other contact chip 196a and 196c.Simultaneously, charged state display 60 slides with charging operations parts 56, gives prominence in the outside of film assembly 10, and the light that makes self-emission device 52 is by 60 projections of charged state display.
Industrial application
As mentioned above, the film assembly that the present invention can be used for loading in advance also is applicable to replaceable film The flasher of minicam, and can be from the flasher that separates of camera body dismounting.
Claims (6)
1, a kind of flasher, the flash charging switch that comprises flasher circuit and flasher circuit is charged is characterized in that, comprising:
Be arranged at the light-emitting component of camera inside, luminous when flasher circuit is finished charging; With
The photoconduction of in camera, slidably installing, make when the flash charging switch conducting, photoconduction is set on the primary importance, end at this position photoconduction is placed in the camera outside, and when flash charging switch turn-offed, photoconduction was set on the second place, this end at this position photoconduction is placed in the camera, optical guide guides light on the primary importance is come the light of self-emission device, and from protruding in the end projection light of camera outside, to show finishing of flasher circuit charging.
2, flasher as claimed in claim 1 is characterized in that, it is block that photoconduction is, and partly in the face of view finder, finishes in the inboard demonstration charging of view finder.
3, flasher as claimed in claim 2 is characterized in that, camera is equipment lens-fitted photo film assembly, and this assembly is provided with the photograph mechanism that comprises phtographic lens, and during fabrication photographic roll film is installed in advance.
4, flasher as claimed in claim 3 is characterized in that, the described end of photoconduction is outstanding from the top side of equipment lens-fitted photo film assembly.
5, flasher as claimed in claim 4 is characterized in that, light projection unit branch is arranged on the end of photoconduction, and the projection of light projection part comes the light of self-emission device, makes cameraman and the people who is photographed can see finishing of charging.
6, as the flasher one of in the claim 1 to 5, it is characterized in that, comprise the charging operations parts, these parts can slide between the 3rd position that makes the flash charging switch conducting and the 4th position that flash charging switch is turn-offed, wherein photoconduction matches with the charging operations parts, makes that photoconduction moves to primary importance when the charging operations parts slide into the 3rd position, and when the charging operations parts slided into the 3rd position, photoconduction moved to the second place.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP228524/1997 | 1997-08-25 | ||
| JP22852497A JP3903117B2 (en) | 1997-08-25 | 1997-08-25 | Film unit with lens |
| JP243869/1997 | 1997-09-09 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98808530A Division CN1268226A (en) | 1997-08-25 | 1998-08-21 | Flash unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1811578A true CN1811578A (en) | 2006-08-02 |
Family
ID=16877776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510070248 Pending CN1811578A (en) | 1997-08-25 | 1998-08-21 | Flash unit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3903117B2 (en) |
| CN (1) | CN1811578A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006091069A (en) | 2004-09-21 | 2006-04-06 | Fuji Photo Film Co Ltd | Film unit with lens |
-
1997
- 1997-08-25 JP JP22852497A patent/JP3903117B2/en not_active Expired - Fee Related
-
1998
- 1998-08-21 CN CN 200510070248 patent/CN1811578A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| JP3903117B2 (en) | 2007-04-11 |
| JPH1164951A (en) | 1999-03-05 |
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| Publication | Publication Date | Title |
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