JPH0643525A - Stroboscoptic device - Google Patents

Abstract

PURPOSE:To maintain the state wherein the stroboscopic device can emit light at all times and suppress the consumption of a power source as much as possible. CONSTITUTION:A photosensor 63 monitors the lighting time and extinction time of a neon tube 10. A cycle detecting circuit 65 clocks the cycles of the illumination and extinction of the neon tube 10 according to the photoelectric signal of the photosensor 63. The cycle detecting circuit 65 outputs an H signal when the extinction time of the neon tube 10 becomes longer than a certain time. A transistor(TR) 66 is turned ON with the H signal to drive a relay coil 67. A TR 70 for oscillation control is turned ON by the driving of the relay coil 67 to supply a current to the primary call side of a voltage boosting circuit 69, and a main capacitor 31 and a trigger capacitor 71 are charged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an always charging strobe device.

[0002]

2. Description of the Related Art The present applicant manufactures and sells a lens-fitted film unit in which a film is built in advance in a unit main body in which a photographing mechanism such as a photographing lens and a shutter device is incorporated. The lens-fitted film unit has a very simple structure so that it can be manufactured at low cost, as is known from Japanese Patent Publication No. 32-32615, and the focus adjusting mechanism and the exposure adjusting mechanism are omitted. As the shooting operation, it is sufficient to press the shutter button after the film has been wound up, and anyone can easily shoot. Among such lens-fitted film units, for example, "Snap Shot Flash" (product name) has a built-in strobe device, which enables shooting at night or indoors.

In the case of a conventional lens-fitted photo film unit having a built-in strobe device, when the stroboscopic photography is performed, the power switch of the strobe device is switched to the ON position, or the power switch is held down, and the neon tube is turned on to turn the main unit on. It was necessary to operate the shutter button after confirming the lighting of the condenser. However, the operation of the power switch and the operation of confirming the lighting of the neon tube imposes an operational burden on the user, and is not preferable especially for the one having a simple operation such as a lens-fitted film unit. . In fact, some of the negatives taken with the lens-fitted film unit are underexposed, which seems to be the result of forgetting to operate the power switch for the strobe device.

On the other hand, in a camera with a built-in strobe, not only indoor shooting and night shooting but also the main subject can be properly exposed even in a backlit scene under daylight, for example.
It is known that the strobe is always made to emit light. In such a camera, the main capacitor for strobe light emission must always be maintained in a charged state, so the charging circuit always operates and the main capacitor is charged when the main switch of the camera is turned on. It is supposed to be. Also, some of these cameras
In order to prevent power consumption, the charging is temporarily stopped when the terminal voltage of the main capacitor reaches a predetermined level, and then restarted when the terminal voltage of the main capacitor falls below a predetermined level. Some have a charge control circuit added.

[0005]

However, in the conventional constant charge / constant light emission type strobe device, the start time and the stop time of the charge are always determined while monitoring the terminal voltage of the main capacitor. You have to constantly consume the charge stored in the capacitor,
There is a problem in terms of efficiency of use of the power supply, and there is a problem that the circuit configuration becomes complicated and the cost is easily increased. In particular, in the strobe device for the lens-fitted film unit, since the battery built in in advance is not replaced, efficient use of the battery is a major problem when trying to use it in the continuous light emission type. It was.

The present invention has been made in view of the above technical background, and an object of the present invention is to provide a strobe device of a constant charge / constant light emission system which suppresses power consumption as much as possible and has a low cost burden.

[0007]

In order to achieve the above object, the present invention determines the charging start time and the charging stop time of the main capacitor based on the lighting time and extinguishing time of the neon tube, and responds to this judgment result. By controlling the current supply to the primary side coil of the booster circuit, on / off control of charging is performed. Further, after the charging is started, the charging may be stopped after a predetermined time determined by a timer has elapsed. It is also possible to adopt a configuration in which the terminal voltage of the main capacitor is monitored in order to detect only the charging start time, and the charging is automatically stopped after a lapse of a fixed time after starting the charging.

Further, the charging time and the charging cycle time are stored so that the charging can be started and stopped automatically without monitoring the blinking of the neon tube or the terminal voltage of the main capacitor at all. A program timer that repeatedly counts the charging time and a charging cycle time longer than this charging time by inputting a signal is operated when the film winding operation performed for each shooting is detected, and charging is performed while the charging time is being measured. It is also an effective means to achieve the object of the present invention that the charging time is measured again at the end of the charging cycle time and the charging is repeated in a predetermined cycle.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 9 showing the external appearance of the lens-fitted film unit embodying the present invention, the unit main body 2 is mainly made of plastic, and the whole is covered with the exterior body 3.
The exterior body 3 is for making the external appearance of the lens-fitted film unit clean, and a paper box or the like having an outer surface printed with operational instructions is used. The exterior body 3 is provided with holes for exposing the taking lens 4, the shutter button 5, the winding knob 6, the finder window 7, the display window 8 for confirming the number of remaining films, the strobe light emitting section 9, and the neon tube 10. It is possible to shoot through these holes.

As shown in FIG. 10, the unit body 2 covered with the exterior body 3 comprises a body base 12, a front cover 13 and a rear cover 14. The film 15 with a cartridge has a cartridge 17 for preliminarily storing a 35 mm wide film 16 in a light-shielded state at the time of assembly thereof, and a roll-shaped film 16 pulled out from the cartridge 17 provided on the main body base 12. The Patrone room 18 across the exposure frame,
And the film roll chamber 19 respectively. A well-known exposure unit 40 is provided on the front surface of the exposure frame, and the photographing light flux incident from the photographing lens 4 is supplied to the film 16
To expose.

A winding knob 6 is provided above the cartridge chamber 18. A fork is provided on the lower surface of the winding knob 6, and the end portion of the film 16 is fixed and engaged with a spool 17a rotatably accommodated in the cartridge 17. The winding-up knob 6 is rotated in the direction of the arrow in FIG. 10 to rotate the spool 17a in the direction in which the photographed film 16 is drawn into the cartridge 17. A tooth row 6a is formed on the outer circumference of the winding knob 6, and a check claw 20 made of a leaf spring is engaged with the tooth row 6a. The check claw 20 is provided to prevent the winding knob 6 from rotating in the reverse direction.

As shown in FIG. 11, the exposure unit 40 comprises a number display plate 41, a locking lever 42, a shutter drive lever 43, shutter blades 44, a driven sprocket 45 and the like. The locking lever 42 is rotatable about a shaft 46, and is biased clockwise by a spring 47 having one end locked to the bent piece 42a. The bent piece 42a is in contact with a rod which is formed under the shutter button 5 and extends rearward, and when the shutter button 5 is pushed down, the locking lever 42 is rotated counterclockwise. Further, the locking lever 42 is provided with a winding stop claw 42b that engages with the tooth row 6a provided on the outer periphery of the winding knob 6 and prevents the winding knob 6 from rotating.

A perforation 16a provided on the film 16 is engaged with a driven sprocket 45 having eight teeth, and one rotation of the driven sprocket 45 causes the film 16 to rotate.
Is sent for exactly one frame. A cam 48 having a notch formed on the outer periphery is provided coaxially with the driven sprocket 45,
The claw 42c of the locking lever 42 is in contact with the outer periphery thereof.

The shutter drive lever 43 is rotatable around a shaft 49, and one end of a spring 47 is hooked on a spring receiver 43a to urge it counterclockwise. The shutter drive lever 43 is integrally provided with a protrusion 43b protruding upward and abuts the protrusion 42d of the locking lever 42, so that the shutter drive lever 43 is rotated counterclockwise against the bias of the spring 47. Be blocked. An L-shaped bent piece 43c is formed on the shutter drive lever 24, and the tip of the bent piece 43c faces the shutter blade 44.

The shutter blade 44 is rotatably mounted about a shaft 50 and is urged in a counterclockwise direction by a spring 51. In the normal state, the shutter blade 44 abuts on a stopper 52 to completely shield the photographing opening 53. There is. A claw 44a is provided at an end of the shutter blade 44, and the shutter blade 44 is opened and closed by the bent piece 43c of the shutter drive lever 43 during shutter release. In addition,
A plate-shaped lens holder 54 is attached to the front surface of the shutter blade 44, and the photographing lens 4 is arranged at a position corresponding to the photographing opening 53.

The driven sprocket 45 is further provided with a one-tooth gear 55 coaxially. This one tooth gear 55
Engages with a tooth row 41a formed on the outer periphery of the number display plate 41. When the driven sprocket 45 makes one rotation, the one-tooth gear 55 also makes one rotation, and the number display plate 41 is rotated by one scale. A projection 41b is formed on the upper surface of the number display plate 41 to prevent contact of the mechanical switch 61 connected to the strobe circuit in the initial state of the lens-fitted photo film unit (unused state in which the shutter is not charged). When the number display plate 41 is rotated by one graduation in the direction of the arrow in the figure, the contact piece 61a urged by the protrusion 41b of the mechanical switch 61 is elastically moved to the other contact piece 61a.
It moves in the b direction and contacts. After that, the sections 61a and 61b of the mechanical switch 61 are kept in contact with each other until the end of photographing, and the mechanical switch 61 is kept in the ON state.

A substrate 30 of a strobe device is provided on the front surface of the film roll chamber 19, and a strobe circuit is incorporated therein. Further, a main capacitor 31 for stroboscopic light emission is provided on the upper part thereof, and is wired to the substrate 30. The stroboscopic light emitting section 9 is provided above the substrate 30, and emits light through holes provided in the front cover 13 and the exterior body 3. Exposure unit 4 for substrate 30 of strobe device
A synchro switch 37 for stroboscopic light emission is provided at the bottom of the end portion facing 0. Sync switch 3
In No. 7, two contact pieces of the synchro switch 37 are pressed by the ends of the shutter blades 44 to come into contact with each other to be energized when the shutter blades completely open the photographing opening 53 by shutter release.

On the bottom surface of the rear cover 14, there is a cartridge chamber 18
A lid 21 is provided at a portion corresponding to the bottom of the cartridge so that the cartridge 17 in which the exposed film 16 is stored in a light-tight manner can be easily taken out. A battery 36, which is a power source for strobe light emission, is housed in a holder below the switch 37 below the main body base 12.

In FIG. 1 showing the strobe circuit, the mechanical switch 61 is connected between the battery 36 and the charging control unit 62, and when the mechanical switch 61 is turned on, power is supplied to the charging control unit 62. The charging control unit 62 uses the neon tube 1
Photosensor 63 and amplifier 6 for photoelectrically detecting 0 emission
4, a cycle detection circuit 65, a transistor 66, and a relay coil 67. The cycle detection circuit 65 outputs a high level signal (H signal) when the time during which the neon tube 10 remains off is longer than the preset time T1, and the time during which the neon tube 10 is continuously lit is preset. A low level signal (L signal) is output when the time becomes equal to or less than T2.

The transistor 66 drives the relay coil 67 to turn on the switch 68 when the H signal is input from the period detection circuit 65, and turns off the drive of the relay coil 67 to receive the L signal and switches the switch. Turn off 68. The switch 68 is connected to the base of an oscillation control transistor 70 that is connected in series to the primary side coil that constitutes the booster circuit 69, and when turned on, the booster circuit 69 oscillates.

Due to the oscillating operation of the booster circuit 69, an alternating current is generated in the secondary coil thereof to charge the main capacitor 31 and the trigger capacitor 71. When the terminal voltage of each of the main capacitor 31 and the trigger capacitor 71 reaches a predetermined level, the neon tube 10 is turned on and the completion of charging is displayed. When the neon tube 10 is turned on, a part of the electric charge stored in the main capacitor 31 and the trigger capacitor 71 is consumed, but each capacitor is immediately charged by the operation of the booster circuit 69. Therefore,
In the process of operating the booster circuit 69 to charge the capacitors 31 and 71, the neon tube 10 first flashes in a long cycle, and as the terminal voltage of each capacitor rises, the flashing cycle becomes shorter, and finally. Will be lit continuously. The photo sensor 63 photoelectrically detects the on / off state of the neon tube 10. As is well known, the trigger capacitor 71 has a trigger coil 72.
Is connected, and when the synchro switch 37 is turned on, it is discharged and a voltage is applied to the trigger electrode 73.

The operation of the strobe device constructed as above will be described. The film unit with lens is
The shutter is not charged while the product is manufactured and sold at the store. When a photographer purchases a lens-fitted film unit and takes a photograph, first, the winding knob 6 is turned to charge the shutter to prepare for photographing. When the winding knob 6 is rotated in the direction of the arrow in FIG. 10, the film 16 is wound into the cartridge 17 and the perforation 16a of the film 16 is rotated.
The sprocket 45 provided on the exposure unit 40 that is engaged with is rotated. With the rotation of the sprocket 45. The number display plate 41 advances in the direction of the arrow in FIG. 11 via the one-tooth gear 55. As the number display plate 41 advances, the contact piece 61a and the contact piece 61b of the mechanical switch 61, the contact of which is blocked by the protrusion 41b, come into contact with each other. After that, as shown in FIG. 2A, the mechanical switch 61 remains in the ON state until the end of shooting.

FIG. 2 is a time chart showing the state after the mechanical switch 61 is turned on. In FIG. 2, (b) is the terminal voltage of the main capacitor 31, (c) is the lighting state of the neon tube 10, and (d) is. The output signal of the cycle detection circuit 65 is shown. When the mechanical switch 61 is turned on, the charging control unit 6
2 is activated, and the photo sensor 63 monitors the lighting state of the neon tube 10. At this point in time, the main capacitor 31 and the trigger capacitor 71 are not charged at all, so the neon tube 10 is turned off.
In the cycle detection circuit 65, the turn-off time of the neon tube 10 is T after the mechanical switch 61 is turned on as shown in FIG.
When it reaches 1, an H signal is output, which causes the transistor 66 to conduct and activate the relay coil 67. As a result, the switch 68 is turned on, the oscillating transistor 70 is turned on, and a current flows through the primary coil, so that the booster circuit 6
9 is driven.

By driving the booster circuit 69, the main capacitor 31 and the trigger capacitor 71 are charged,
The terminal voltage of the main capacitor 31 rises as shown in (b). Then, for example, when the charging voltage of the main capacitor 31 reaches the L1 level, the neon tube 10 lights up. And at the moment when the neon tube 10 lights up, the main capacitor 3
The terminal voltage of 1 drops slightly, so that the neon tube 10 is once turned off. However, since the booster circuit 69 continues to be charged, the neon tube 10 is turned on again. Then, until the terminal voltage of the main capacitor 31 reaches the level L2, the neon tube 10 repeats blinking such that the turn-off time is short and the turn-on time is long, and when the level L2 is reached, the neon tube 10 is continuously turned on.

When the neon tube 10 is turned on and its lighting time reaches T2, the output signal of the cycle detection circuit 65 switches from the H signal to the L signal. As a result, the transistor 66 is cut off and no current flows through the relay coil 67, so the switch 68 is turned off, the oscillation control transistor 70 is turned off, and the current supply to the primary side coil of the booster circuit 69 is cut off. In this way, the oscillating operation of the booster circuit 69 is completed, the charging of the main capacitor 31 and the trigger capacitor 71 is completed, and the neon tube 10 is in the continuous lighting state. Therefore, when photographing is performed in this state and the shutter blade 44 is fully opened, the synchro switch 37 is turned on at that moment, the discharge current due to the electric charge accumulated in the trigger capacitor 71 flows in the trigger coil 71, and the strobe discharge tube 75 causes the main capacitor to operate. The light from 31 discharges and emits light.

When the main capacitor 31 and the trigger capacitor 71 are completely charged and then left as they are, the charge stored in each capacitor is consumed by the lighting of the neon tube 10, and the terminal voltage gradually decreases. Come on. Then, when the terminal voltage drops to the level L1, the neon tube 10 is turned off. After the neon tube 10 is extinguished, when the extinguishing time becomes T1, the cycle detection circuit 65 becomes H level again.
Output a signal. As a result, the booster circuit 69 is activated again, and the charging of each capacitor is restarted. When the charging of each capacitor progresses, the neon tube 10 repeats blinking and then becomes a continuous lighting state. Then, when the lighting time of the neon tube 10 reaches T2, the L signal is output from the cycle detection circuit 65, the booster circuit 69 is turned off again, and the recharge is completed. After that, the same operation is repeated.

As described above, the main capacitor 31 and the trigger capacitor 71 are charged intermittently based on the lighting state of the neon tube 10. The consumption of 36 can be suppressed. Further, although the charging control circuit 62 is always supplied with power, its power consumption is extremely low. Therefore, the power consumption is less than simply monitoring the terminal voltage itself of the main capacitor 31, and recharging is performed. The timing can be detected accurately.

FIG. 3 shows another example of the configuration of the charge control section 62, in which another cycle detection circuit 77 and a timer 78 are used instead of the cycle detection circuit 65. The cycle detection circuit 77 outputs an H signal when the extinguishing time of the neon tube 10 is longer than T1 and outputs an L signal when the extinguishing time of the neon tube 10 is shorter than T1. Timer 78
Outputs the H signal for a time T3 from the time when the H signal is received from the cycle detection circuit 77.

According to the above, as shown in FIG. 4, the timer 78 keeps the transistor 66 conductive during the time T3 from the time when the extinguishing time of the neon tube 10 reaches T1, and the main capacitor 31 and the trigger capacitor 71 are turned on. Charge it.
Since the time T3 is set to such a time that the main capacitor 31 and the trigger capacitor 71 can be completely charged, in this example, it is not necessary to monitor the lighting time of the neon tube 10.

FIG. 5 shows an embodiment in which the charging start timing is obtained by monitoring the terminal voltage of the main capacitor 31. The terminal voltage of the main capacitor 31 is input to the non-inverting terminal of the comparator 80 via the voltage dividing resistor.
The reference voltage is input to the inverting input terminal of the comparator 80 via the Zener diode 81, and when the input voltage to the non-inverting input terminal becomes equal to or lower than the reference voltage, the H signal appears at the output terminal of the comparator 80.

The timer 8 is connected to the output terminal of the comparator 80.
2 is connected, the time T4 is measured by inputting the H signal, and the H signal is output during the time period. The H signal causes the transistor 83 to conduct, driving the relay coil 84, which turns on the switch 68. Since the time T4 of the timer 82 is set to a time sufficient to fully charge the main capacitor 31 and the trigger capacitor 71, the reference voltage applied to the inverting input terminal of the comparator 80 is shown in FIG. By setting the level to the level L2, it is possible to achieve exactly the same function as shown in the time chart of FIG.

In the examples described so far, the mechanical switch 61 is turned on at the start of use of the lens-fitted photo film unit, and thereafter kept in the on state. However, the strobe device having the circuit configuration shown in FIG. , And is used together with a mechanical switch 88 that is turned on each time a film winding operation is performed every time after photographing. This mechanical switch 88 is
As shown in FIG. 7, the shutter drive drive lever 43 that opens and closes the shutter blade 44 is opened and closed. When the shutter drive lever 43 moves to the charge position by winding the film, the one contact piece 88a constituting the mechanical switch 88 is brought into contact with the other contact piece 88b.
Then, the shutter is released to release the shutter drive lever 43.
After the kick kicks the claw 44a of the shutter blade 44, the mechanical switch 88 remains off until the shutter drive lever 43 returns to the charge position in conjunction with film winding.

As shown in FIG. 6, a program timer 90 is connected to the mechanical switch 88, and the mechanical switch 88
When turns on, the timekeeping operation starts. Program timer 9
In 0, both the charging time T5 and the charging cycle time T6 set longer than this charging time are stored, and the charging time T5 and the charging cycle time T6 start counting at the same time when the mechanical switch 88 is turned on. To be done. Then, the program timer 90 outputs the H signal only during the measurement of the charging time T5, and outputs the L signal when the measurement of the charging time is completed. Further, at the end of the time counting of the charge cycle time T6, the time counting of the charge time T5 and the charge cycle time T6 is repeated again.

The program timer 90 includes a transistor 9
2 is connected, and it conducts while the H signal is being input from the program timer 90, and is in the cutoff state while the L signal is being input. When the transistor 92 becomes conductive, the relay coil 93 is driven and the switch 68 connected to the base of the oscillation control transistor 70 is turned on. As a result, in the same way as the above-mentioned example, the booster circuit 69
Is activated to charge the main capacitor 31 and the trigger capacitor 71.

The charging time T5 and the charging cycle time T6 set in the program timer 90 are set so that the charging and charging suspension actions shown in the time chart of FIG. 8 can be obtained. In FIG. 8, (a) is the on / off state of the mechanical switch 88, (b) is the terminal voltage of the main capacitor 31, (c) is the time counting operation of the program timer 90, and (d) is the charging and charging pause period. ing.

When the mechanical switch 88 is turned on by the film winding operation, the program timer 90 sets the charging time T.
4 and charging cycle time T5 are started. Since the transistor 92 is turned on by the H signal output from the program timer 90 while the charging time T4 is being measured, the oscillation control transistor 70 is turned on via the relay coil 93 and the switch 68, and the main capacitor 31 and the trigger capacitor 71 are turned on. Is charged.

The charging time T4 is set to such a length that the terminal voltage of the main capacitor 31 and the trigger capacitor 71 is "0" to the full charging level L4. Therefore, at the end of the time measurement of the charging time T4, each capacitor is in a fully charged state. The charging cycle time T5 is measured in parallel with the charging time. The charging cycle time T5 is set corresponding to the time required for the terminal voltage of each capacitor to drop to the level T5 when the capacitors are left in a fully charged state. This level L5
Is determined on the basis of the terminal voltage of the main capacitor 31 at which the amount of light emission within a permissible range is obtained when the strobe is emitted at that level, and when the terminal voltage of the main capacitor 31 is level 5 or higher, the neon tube 10 Lights up and indicates that the flash is ready for shooting.

When the measurement of the charge cycle time T5 is completed, the program timer 90 repeats the measurement of the charge time T4 and the charge cycle time T5 again. Therefore, charging is performed again when the terminal voltage of the main capacitor 31 drops to the level L5, and after the main capacitor 31 is fully charged, stroboscopic photography is always possible.

When the shutter button 5 of the lens-fitted film unit is pressed for photographing, the shutter blade 44 turns on the synchro switch 37 to perform stroboscopic photographing. As a result, the electric charges stored in the main capacitor 31 and the trigger capacitor 71 are consumed, and the terminal voltage thereof becomes "0". Further, since the shutter drive lever 43 moves to the release completion position, the mechanical switch 88 is turned off. If the camera is left unattended for the next shooting, the mechanical switch 88 remains off, so that each capacitor is not charged unnecessarily.

After filming, when film winding operation is performed for the next filming, the shutter drive lever 43 moves to the charge position and the mechanical switch 88 is turned on. Then, from this point in time, the program timer 90 starts the regular operation and starts charging the meso-in capacitor 31 and the trigger capacitor 71 as described above. Therefore, when the film winding operation is performed for the next photographing, each capacitor is always kept in the charged state once the neon tube 10 is turned on, and the stroboscopic photographing can be performed at any time.

In the above embodiment, the program timer 90 uses the charging time T4 and the charging pause time "T5-T4".
The same function can be achieved by alternately repeating and timing. Further, the present invention can be applied not only to a strobe device built in a film unit with a lens, but also to a strobe device built in a normal compact camera.

[0042]

As described above, according to the strobe device of the present invention, the main capacitor is recharged based on the lighting state of the neon tube and the terminal voltage of the main capacitor without imposing a heavy burden on the power battery. Therefore, the strobe can be always maintained in a usable state even in a lens-fitted film unit or a camera having a built-in battery with a small power supply capacity.

Further, a program timer storing the charging time and the charging cycle time is used, and the program timer is timed by detecting the film winding operation, thereby completely monitoring the lighting state of the neon tube and the terminal voltage of the main capacitor. Without this, it is possible to automatically maintain the main capacitor in the charged state.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an example of a flash device embodying the present invention.

FIG. 2 is a time chart showing the operation of the strobe device shown in FIG.

FIG. 3 is a circuit diagram showing another example of a cycle detection circuit used in the flash device of FIG.

FIG. 4 is a time chart showing the operation of the strobe device when the cycle detection circuit of FIG. 3 is used.

FIG. 5 is a circuit diagram showing another example of a strobe device embodying the present invention.

FIG. 6 is a circuit diagram showing still another example of a flash device embodying the present invention.

FIG. 7 is a perspective view of an exposure unit used with the strobe device of FIG.

FIG. 8 is a time chart showing the operation of the strobe device shown in FIG.

FIG. 9 is an external view of a lens-fitted film unit using the strobe device of the present invention.

10 is an exploded perspective view of the lens-fitted film unit shown in FIG. 9. FIG.

11 is an enlarged exploded perspective view of the exposure unit shown in FIG.

[Explanation of symbols]

 2 Unit body 5 Shutter button 6 Winding knob 9 Strobe light emitting unit 12 Body base 16 Film 30 Board 31 Main capacitor 36 Battery 37 Synchro switch 40 Exposure unit 44 Shutter blade 61,88 Mechanical switch 62 Charge control unit 65,77 Cycle detection circuit 67 , 84, 93 Relay coil 69 Booster circuit 71 Trigger capacitor 72 Trigger coil 75 Strobe discharge tube 78, 82 Timer 80 Comparator 90 Program timer

Claims (4)

[Claims] 1. A strobe device for causing a strobe discharge tube to emit light by an electric charge from a main capacitor charged to a predetermined voltage by a booster circuit and for displaying that the main capacitor has been charged to the predetermined voltage by lighting a neon tube. , Detecting means for detecting the lighting time and the extinguishing time by monitoring the blinking of the neon tube, and outputting an ON signal when the extinguishing time is a predetermined time or more in response to a signal from this detecting means, and the lighting time A signal output means for outputting an off signal when the time is equal to or more than a fixed time, a current is supplied to the primary coil of the booster circuit when an on signal is received from the signal output means, and the primary side is supplied when an off signal is received. A strobe device having a switching means for cutting off the current of the coil. 2. A timer for counting a certain time in response to the ON signal is provided, and when the timer completes timing, the current in the primary side coil is cut off via the switching means. The strobe device described. 3. A strobe device for a camera, which emits light from a strobe discharge tube by electric charges from a main capacitor charged to a predetermined voltage by a booster circuit, wherein the terminal voltage of the main capacitor is monitored and the terminal voltage is below a certain voltage. Sometimes a means to output a detection signal,
A timer for counting a fixed time by the input of the detection signal, and a switching means for supplying a current to the primary coil of the booster circuit during the time period of the timer and cutting off the current supply when the timer finishes timing. Strobe device characterized by. 4. A strobe device for a camera, which emits light from a stroboscopic discharge tube by electric charges from a main capacitor charged to a predetermined voltage by a booster circuit, detects a film winding operation of the camera performed every time photographing is performed, and detects the detection signal. Means for outputting, the charging time and the charging cycle time longer than this charging time are stored, the time counting of the charging time and the charging cycle time is repeated by the input of the detection signal, and again when the timing of the charging cycle time ends. A program timer for measuring the charging time and a switching means for supplying a current to the primary coil of the booster circuit during the charging period for the charging time and cutting off the current supply to the primary coil when the time measurement is completed. Characteristic strobe device.