JP2002357860A - Stroboscopic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart a new function to a stroboscopic device without providing an additional space. SOLUTION: The stroboscopic device is constituted of a main capacitor 25, a stroboscope substrate 30 on which a stroboscopic circuit including a circuit element such as a synchronous switch 27 and a stroble light emitting part 6 are formed, and a sub substrate 35 on which a light control circuit including a circuit element such as a phototransistor 36, etc., are formed. A thyristor 31 constituting the light control circuit is attached to the stroboscope substrate 30. Guide pins 37 and 38 and a trapezoidal pin 39 are insert-molded on the sub substrate 35. The light control circuit on the sub substrate 35 and the stroboscopic circuit on the stroboscope substrate 30 are connected and assembled with a lead wire. A stroboscope charging switch 5 is assembled by inserting the guide pins 37 and 38 on the sub substrate 35 into guide holes 44 and 45. The sub substrate 35 is made usable as a supporting member for the stroboscope charging switch 5 so that it is unnecessary to provide an addition space for the sub substrate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strobe device used for, for example, a film unit with a lens.

[0002]

2. Description of the Related Art A film unit with a lens is manufactured and sold by the present applicant as a kind of a simple camera in which an unexposed photographic film is loaded in advance in a unit main body having a built-in simple photographing mechanism. There are various types of film units with a lens, and some have a built-in strobe device so that they can be used for indoor or nighttime shooting. The strobe device built into such a film unit with a lens has a simplified structure in order to manufacture it at low cost, and the electronic parts forming the strobe light emitting unit and the strobe circuit are mounted on a printed circuit board. It is often turned into.

In such a strobe device, a strobe substrate on which a circuit element such as a main capacitor is mounted and a strobe circuit for controlling charging and discharging of the main capacitor is formed, and a strobe light for emitting strobe light is provided. And a unit. The discharge of the main capacitor is performed in conjunction with the pressing operation of the shutter button, and a constant amount of strobe light can be emitted from the strobe light emitting section toward the subject.

[0004]

SUMMARY OF THE INVENTION In the above-mentioned strobe device,
When a new function such as a dimming function is added, for example, there is a method of attaching an additional substrate to a conventional strobe device. However, the strobe device itself becomes large, and it is necessary to provide a space for an additional substrate inside the film unit with a lens. In addition, the external shape of the external cover of the lens-fitted film unit must be increased accordingly. In other words, the size of the lens-fitted photo film unit becomes large, which goes against the recent tendency of downsizing of the photo-film unit with lens.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a strobe device capable of adding a new function such as an auto strobe function without changing the outer shape of a film unit with a lens.

[0006]

In order to achieve the above object, a strobe device of the present invention comprises a main capacitor, a strobe discharge tube, a power supply terminal for receiving power from a battery, and
A strobe circuit including a circuit element forming a booster circuit and a circuit element forming a trigger circuit is formed to emit light from a strobe discharge tube at a constant light emission amount, and photometric integration is performed by a photometric element that receives strobe reflected light. A switching element for stopping emission of strobe light in response to the value reaching a predetermined level includes a strobe substrate connected to the strobe circuit, and a circuit element such as the photometric element. And a sub-board on which a dimming circuit to be connected is formed, wherein the sub-board has an operation section exposed from a front cover, and a strobe charging switch for switching on / off of charging of the main capacitor using the operation section. And the strobe charging switch, and guide the slide of the strobe charging switch, and It is obtained by the receiving member for holding the ball charge switch at a charging position or charge stop position.

A guide pin which is inserted through the sub-substrate into a guide hole formed in the strobe charging switch and guides a slide of the strobe charging switch between a charging position and a charging stop position; In the stop position, a trapezoidal pin is formed integrally with a projection formed on the strobe charging switch.

[0008]

FIG. 1 is a perspective view showing the front of a lens-fitted film unit 2 embodying the present invention. On the front surface of the film unit 2 with a lens, a photographic lens 3, an object-side finder window 4, a strobe charging switch 5, a strobe light emitting unit 6, and a photometric window 7 are provided. On the upper surface of the lens-fitted film unit 2, a release button 8, a number-of-photographs counter window 9, and a light guide 10 are provided.

As shown in FIG. 2, the lens-fitted film unit 2 includes a main body 13 and a front cover 14 and a rear cover 15 which are arranged to cover the front and rear sides of the main body 13. . A cartridge chamber 16 and a film roll chamber 17 are formed on the left and right sides of the main body base 13, respectively. A film cartridge 18 and a film roll 19a which is a roll of the photographic film 19 are loaded therein. A winding knob 20 is arranged at an upper portion of the cartridge chamber 16, and a shaft member to be engaged with a spool of the film cartridge 18 is formed at a lower portion of the winding knob 20. By rotating the winding knob 20 counterclockwise in the figure, the photographed photo film 19 is wound up into the film cartridge 18.

The cartridge chamber 16 and the film roll chamber 1
A dark box is provided between the shutter box 7 and a shutter mechanism, a film wrapping mechanism, a counter mechanism for displaying the number of remaining photographable frames, a finder, and the like. An exposure opening is formed at the center of the front surface of the dark box, and shutter blades and a lens holder 21 are mounted on the front surface thereof.

As shown in FIG. 3, the strobe device 24 includes:
It is composed of a strobe board 30 on which circuit elements such as a main capacitor 25, a strobe light emitting section 6, a synchro switch 27, a metal contact 28, a pair of battery contacts 29 are mounted, and a sub-board on which a photometric element and the like are mounted. ing. The synchro switch 27 is short-circuited with the rotation of the shutter blades constituting the shutter mechanism, and causes the strobe discharge tube 64 (see FIG. 4) provided in the strobe light emitting section 6 to emit light. The pair of metal contact pieces 29 are turned on and off by a vertical sliding operation of the strobe charging switch 5. In addition, a thyristor 31 constituting the dimming circuit 51 is mounted on the strobe board 30, and positioning pins 32 used when assembling the sub-board 35 are provided. Reference numeral 33 denotes a battery.

A phototransistor 36 used as a photometric element is mounted on the front surface of the sub-substrate 35, and a dimming circuit 51 is formed on the rear surface. Guide pins 37 and 38 and trapezoidal pins 39 are insert-formed on the front surface of the sub-board 35. A plurality of positioning projections 40 having a predetermined height are provided on the rear surface of the sub-substrate 35. By assembling the sub-board 35 between the strobe board 30 and the strobe charging switch 5, it is also used as a receiving plate.

The strobe charging switch 5 is provided on an operation unit 42 exposed from the front cover 14 on a plate-shaped switch body 41.
And a projection (not shown) provided on the light guide 10 is sandwiched from above and below, and a part of the light guide 10 is projected to the outside with the sliding operation of the strobe charging switch 5 to the charging position (upward in the figure). A holding portion 43 is formed. The switch body 41 has guide holes 44 and 4 for guiding the slide of the strobe charging switch 5.
5 and an opening 46 are formed. Guide holes 44, 45
The guide pins 37 and 38 provided on the sub-board are inserted to guide the slide of the strobe charging switch 5.
A projection 4 is provided on a partition 47 between the guide hole 45 and the opening 46.
8 are provided. The projection 41 is engaged with the trapezoidal pin 39 of the sub-board at the charging position of the strobe charging switch and at the charging stop position.

As shown in FIG. 4, the circuit used for the strobe device 24 includes a strobe circuit 50 and a dimming circuit 51. The strobe circuit 50 is formed on the main board 32, and the dimming circuit 51 is formed on the sub board 37. The strobe circuit 50 and the dimming circuit 51 are connected to the main capacitor 34.
Terminals.

Oscillation transformer 55 and oscillation transistor 5
Reference numeral 6 denotes a well-known blocking circuit, which converts a voltage into a high voltage of about 300V. Oscillation transformer 5
Reference numeral 5 includes a primary coil 55a, a secondary coil 55b, and a tertiary coil 55c, each of which is inductively coupled. One end of the primary coil 55a is connected to the positive electrode of the battery 33, and the other end is connected to the collector terminal of the oscillation transistor 56. One end of the secondary coil 55b is connected to the rectifying diode 5
7 is connected to the positive electrode of the battery 33 together with one end of the tertiary coil 55c. Also,
The other end of the tertiary coil 55c is connected to the metal contact piece 28 through the resistor 58.

The cathode of the rectifying diode 57 is connected via a resistor 59 to one end of a trigger capacitor 60 and one end (plus side) of the main capacitor 25. The other end of the trigger capacitor 60 is connected to the metal contact piece 28. The emitter terminal of the oscillation transistor 56 is connected to the battery 3
The base terminal is connected to the metal contact piece 28 via the resistor 61.

The trigger capacitor 60 is charged by the output current from the oscillation transformer 55, similarly to the main capacitor 25. The sync switch 27 is turned on and off in synchronization with opening and closing of the shutter blades. When the sync switch 27 is turned on, the charged trigger capacitor 60 causes a discharge current to flow through the primary coil 62 a of the trigger coil 62. When a discharge current flows through the primary coil 62a, a trigger voltage is generated in the secondary coil 62b and applied to the strobe discharge tube 64 via the trigger electrode 63. Thus, the flash emission is started at the moment when the shutter blade is fully opened.

Reference numeral 65 denotes a light emitting diode provided below the light guide 10, and its anode and cathode are connected to both terminals of the tertiary coil 55c. When the charging voltage of the main capacitor 34 reaches the specified charging voltage, the voltage between both terminals of the tertiary coil 55c exceeds a predetermined value, and the light emitting diode 65 turns on.

The strobe discharge tube 64 includes a strobe light emitting unit 6
When a trigger voltage is applied to the trigger electrode 63, the insulation between the electrodes is broken and the main capacitor 25 is discharged between the electrodes to emit strobe light.

The dimming circuit 51 formed on the sub-board 35
The main capacitor 25 is connected in parallel with the strobe discharge tube 64 and to both terminals of the main capacitor 25. The capacitor 70, the resistor 71, and the zener diode 72 constitute an operating voltage generation circuit.
The capacitor 70 is charged by the output current (300 V) of the oscillation transformer 55 when the main capacitor 25 is charged, and stops charging in a saturated state (400 V, 0.022 μF). When the main capacitor 25 starts discharging through the strobe discharge tube 64, the capacitor 70 discharges through the strobe discharge tube 64, the zener diode 72, and the resistor 71.

The phototransistor 36 has its collector terminal connected to the cathode of the Zener diode 72 via a resistor 74. Further, resistors 75 and 76 and a capacitor 77 are connected in series between the emitter terminal of the phototransistor 36 and the anode of the zener diode 72. The phototransistor 36 is arranged at a position facing the photometric window 7 on the front surface of the film unit 2 with a lens, and allows a photocurrent to flow according to the intensity of the reflected light from the subject. The capacitor 77 is charged by the photoelectric current from the phototransistor 36, and the charged voltage increases.
That is, the capacitor 77 converts the amount of reflected light from the subject received by the phototransistor 36 into a voltage.
Note that a photodiode or the like may be used instead of the phototransistor 36.

The switching unit 80 is composed of transistors 81 and 82. The base terminal of the transistor 81 and the collector terminal of the transistor 82
5 and the connection point of the resistor 76. The collector terminal of the transistor 81 is connected to the base terminal of the transistor 82, and the emitter terminal of the transistor 81 is connected to the anode of the Zener diode 72. The emitter terminal of the transistor 82 is connected to the cathode of the Zener diode 72 via the resistor 74. In the switching unit 80, when the charging voltage of the capacitor 77 reaches a predetermined voltage, the transistors 81 and 82 are turned on, and the switching unit 80 itself is turned on. In this example, turning on of the switching unit 80 is a light emission stop signal.

The capacitor 84 and the resistor 85 constitute an on-voltage generation circuit. One end of the capacitor 84 is connected to the anode of the zener diode 72, and one end of the resistor 85 is connected to the cathode of the zener diode 72.
The capacitor 84 is charged via a resistor 85 by a voltage generated across the Zener diode 72. When the switching unit 80 is turned on, the capacitor 84 discharges through the resistor 85, the resistor 74, and the switching unit 80. At this time, a gate voltage for turning on the thyristor 31 is generated between the terminals of the resistor 85. I do.

The thyristor 31 has a gate and a cathode connected to both ends of the resistor 85, and an anode and a cathode connected to both ends of the main capacitor 25. That is, the charging voltage of the main capacitor 25 is applied between the anode and the cathode of the thyristor 31, and the terminal voltage of the resistor 85 generated when the capacitor 84 discharges is applied between the gate and the cathode.

Next, the operation of the present embodiment will be described. As shown in FIG. 3, circuit terminals such as a main capacitor 25, a strobe light emitting unit 6, a synchro switch 27, a metal contact 28, and a pair of battery contacts 29 are mounted on the strobe board 30 by soldering or the like. At the time of soldering, the thyristor 31 is mounted on the strobe board 30 in parallel with the main capacitor 25 so that the plus terminal of the main capacitor 25 and the cathode of the thyristor 31 are connected. The strobe board 30 is attached to the main body base 13 in which each photographing mechanism is incorporated by nail coupling.

The sub-board 35 on which the dimming circuit 51 is formed is attached to the strobe board 30 attached to the main body base 13. Positioning pin 3 provided on strobe substrate 30
The sub-board 35 is positioned with respect to the flash board 30 by inserting the positioning pins 22 (see FIG. 2) formed on the base board 2 and the main body into the positioning holes 35 a and 35 b of the sub-board 35. The gate terminal of the thyristor 31 incorporated in the strobe substrate 30 is connected to the contacts of the capacitor 84 and the resistor 85 via a lead wire. One end of the capacitor 70 and the anode of the zener diode 72 are connected to the plus side and the minus side of the main capacitor 25 by lead wires. As a result, the strobe circuit 50 and the light control circuit 51 are connected, and an auto strobe device is obtained. Further, the strobe charging switch 5 is assembled by inserting the guide pins 37, 38 of the sub-board 35 into the guide holes 44, 45, and the front cover 14 is attached. After that, the film cartridge 18 and the film roll 19
is loaded, and the rear cover 15 is attached. As a result, a film unit with a lens having an auto flash function is completed.

When a strobe device without a light control function is mounted at the time of assembling the film unit 2 with a lens, a conventional receiving plate (light control) is used instead of the sub-board 35 on which the light control circuit 51 is formed. By attaching a circuit and a photometry element to the front surface of the flash substrate 30, a film unit with a lens having no light control function can be assembled.

In this embodiment, the guide pin and the trapezoidal pin for the strobe charge switch are insert-molded on the surface on the side of the strobe charge switch in order to give the function of the receiving plate to the sub-substrate. And may be later attached to the sub-substrate. Further, although the receiving plate is formed from the sub-board, a part of the conventional receiving plate may be cut out and the sub-board may be integrally attached thereto.

In this embodiment, the lead wire is soldered to a predetermined contact when connecting the dimming circuit to the strobe circuit. However, the terminal of the main capacitor may be directly soldered to the dimming circuit.

[0030]

As described above, according to the strobe device of the present invention, the sub-substrate including the circuit device such as the photometric device and the dimming circuit connected to the strobe circuit and the switching device is formed by the main capacitor. Since it is arranged between the strobe charging switch for switching on / off of the charging and the strobe board, and guides the sliding operation of the strobe charging switch, and is used as a receiving member for holding the strobe charging switch in the charging position or the charging stop position. By using the space of the conventional receiving plate, the auto strobe device can be configured, and it is not necessary to change the external dimensions of the film unit with the lens.

Further, since the receiving plate with the dimming circuit and the conventional receiving plate can be selected and assembled to the strobe substrate, the collected strobe substrate can be reused without being discarded. . Further, for example, even when the auto strobe function is not provided, the photometry window of the front cover can be covered with a dedicated label, so that parts can be shared.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the appearance of a film unit with a lens embodying the present invention.

FIG. 2 is an exploded perspective view showing an internal configuration of a film unit with a lens.

FIG. 3 is a perspective view illustrating a configuration of a strobe device.

FIG. 4 is a circuit diagram showing a configuration of a strobe circuit and a dimming circuit.

[Explanation of symbols]

 2 Film unit with lens 5 Strobe charge switch 7 Metering window 24 Strobe device 25 Main capacitor 31 Thyristor 35 Sub board 36 Phototransistor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G03C 3/00 G03C 3/00 575B

Claims (2)

[Claims] 1. A flash device comprising a main capacitor, a strobe discharge tube, a power supply terminal receiving power from a battery, a circuit element forming a booster circuit, and a circuit element forming a trigger circuit, and having a constant light emission amount. A strobe circuit for emitting light from the discharge tube is formed, and a switching element for stopping emission of strobe light in response to a photometric integrated value of a photometric element receiving strobe reflected light reaching a predetermined level is provided in the strobe circuit. A strobe substrate connected thereto, and a sub-substrate including a circuit element such as the photometric element, and a dimming circuit connected to the strobe circuit and the switching element are formed. The sub-substrate is operated from a front cover. A strobe charging switch for exposing the main capacitor, and switching on / off of charging of the main capacitor using the operation unit; Thereby disposed between the substrate, the strobe guide the sliding of the charging switch, the flash device, characterized in that said flash charge switch and a receiving member for holding the charging position or charge stop position. 2. A guide pin, which is inserted into a guide hole formed in the flash charging switch and guides a slide of the flash charging switch between a charging position and a charging stop position, and the charging position or the charging position. The strobe device according to claim 1, wherein a trapezoidal pin that engages with a projection formed on the strobe charging switch at the stop position is formed integrally.