JP3773150B2 - Strobe device for film unit with lens - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a strobe device for a lens-fitted photo film unit.
[0002]
[Prior art]
The film unit with a lens is a unit body with a simple shooting mechanism that has a built-in roll film with an unexposed cartridge in advance, so that you can easily take a picture without a camera. It is widely used because it is inexpensive and easy to use, and a device with a built-in strobe device is also sold so that it can be taken easily indoors or at night.
[0003]
As is well known, the strobe device for a film unit with a lens as described above charges a main capacitor with a boosted current, generates a high voltage current with a trigger coil in conjunction with a shutter device, and triggers the high voltage current. The contact piece guides the strobe discharge tube to ionize the inside of the discharge tube, so that the main capacitor is discharged and the strobe discharge tube emits strobe light.
[0004]
Of the strobe devices described above, the trigger contact for guiding a high voltage current from the secondary output terminal of the trigger coil to the strobe discharge tube is conventionally soldered at one end to the secondary output terminal of the trigger coil and at the other end. A metal plate connected to the reflector or a lead wire has been used.
[0005]
[Problems to be solved by the invention]
However, as described above, the soldering between the metal plate or the lead wire and the secondary output terminal of the trigger coil is troublesome in terms of cost reduction and productivity improvement because it takes time and assembly time. It has become. The soldering process requires regular maintenance for production management, and there are problems such as high power consumption and solder consumption.
[0006]
The present invention has been made in consideration of the above-mentioned problems of the prior art, and by simplifying the trigger contact attachment process of the strobe device for a lens-fitted photo film unit and reducing the assembly time, the manufacturing cost is reduced. The purpose of this is to reduce the equipment area required for the trigger contact piece mounting process and to make effective use of the manufacturing facility.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, a strobe discharge tube filled with gas, a trigger coil for generating a high voltage current for starting discharge in the strobe discharge tube, and the strobe discharge tube are in contact with each other. And a trigger contact piece for transmitting a high voltage current output from the trigger coil to the strobe discharge tube. In the strobe device for a film unit with a lens attached to the film unit with a lens, the trigger contact piece has elasticity. One end is pressed against the output terminal by the elasticity of a bent plate formed by being refracted in the penetrating direction of the secondary output terminal of the trigger coil, and the other end is in contact with the strobe discharge tube. The direction of the drag force received from the tube is substantially the same as the penetration direction .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an external perspective view showing a lens-fitted film unit embodying the present invention, and FIG. 3 is an exploded perspective view thereof. The lens-fitted photo film unit 2 is composed of a unit main body 3 incorporating a photographic film cartridge and various photographing mechanisms, and an exterior body 4 that wraps the unit main body 3. The exterior body 4 has an outline that exposes the winding knob 5, the shutter button 6, the strobe light emitting unit 7, and the like of the unit body 3. In addition, holes for exposing the photographing lens 8, the finder 9, the number-of-photographing number display window 10, and the like are provided, and a photographing operation can be performed in a state where the unit body 3 is wrapped with the exterior body 4.
[0009]
As shown in FIG. 3, the unit main body 3 includes a main body base 12, a rear cover 13, a photographing mechanism 14, a strobe device 15, and a front cover 16. On the front surface of the main body base 12, a photographing lens 14, which is a unit formed by assembling a photographing lens 8, a shutter mechanism, a shutter charge mechanism winding mechanism, and the like on a mechanical base 17, is attached. The rear cover 13 is assembled behind the main body base 12 and stores the photographic film cartridge 18 in a light-tight manner between the rear cover 13 and the main body base 12.
[0010]
The front cover 16 is attached to the front surface of the main body base 12. On the upper surface of the front cover 16, there is provided a shutter button 6 that is formed by cutting out a part thereof and making it elastic. A pressing rod 19 is integrally provided below the shutter button 6, and the pressing rod 19 presses the components of the photographing mechanism 14 to operate the shutter mechanism.
[0011]
An exposure opening 31 is formed at the center of the main body base 12, and the photographing mechanism 14 is attached to the front surface of the exposure opening 31. On both sides of the exposure opening 31, a cartridge chamber 21 for storing the cartridge body 20 of the photographic film cartridge 18 and a film roll 22a in which the unexposed photographic film 22 pulled out from the cartridge body 20 is rolled are stored. Film roll chambers 23 are formed integrally with each other.
[0012]
The bottom surfaces of the cartridge chamber 21 and the film roll chamber 23 are respectively open surfaces, and are closed by bottom lids 28 and 29 provided integrally with the rear cover 13 after the photographic film cartridge 18 is loaded. . And the reverse rotation prevention nail | claw 25 is integrally formed in the back upper part of this main body base 12. As shown in FIG.
[0013]
4 is a perspective view showing only the strobe device of the exploded perspective view of FIG. Components necessary for a known strobe circuit such as a main capacitor 32, a resistor 33, a transistor 34, an oscillation coil 35, a strobe discharge tube 36, and a trigger coil 45 are attached and wired to the strobe board 31 by soldering. Further, a battery holder to which a charge completion lamp 37 that is turned on when the electric charge charged in the main capacitor 32 reaches a level at which the strobe arc tube can emit light, and a dry battery 38 that supplies power to the strobe device 15 are attached. 39 etc. are provided.
[0014]
Furthermore, a synchro switch 41 is attached to the end of the strobe board 31. The sync switch 41 is mechanically interlocked with the operation of the shutter blades, and the one contact piece 41a is pressed to bend downward, and is brought into contact with the other contact piece 41b so as to be conductive. The discharge tube 36 is caused to emit light.
[0015]
FIG. 1 is an external perspective view showing a trigger coil and a trigger contact piece, and FIG. 5 is an enlarged view of an engagement portion thereof. The trigger coil 45 includes a coil portion 45a, a lower terminal 45b, and an output terminal 45c on the upper surface. The lower terminal 45b is soldered to the circuit pattern of the strobe board 31.
[0016]
A trigger contact piece 46 is attached to the output terminal 45c. The trigger contact piece 46 is formed of an elastic metal plate, and an engagement hole 46a is formed at one end, and a contact end 46b is formed at the other end. The output terminal 45 c of the trigger coil 45 penetrates into the engagement hole 46 a of the trigger contact piece 46. A retaining plate 46c refracted in the penetration direction of the output terminal 45c is integrally formed on one side of the engagement hole 46a, and is pressed against the output terminal 45c by an elastic force, and the output terminal 45c and the trigger contact piece 46 are formed. And electrically connect.
[0017]
Since the retaining plate 46c is refracted in the direction in which the output terminal 45c penetrates, the trigger contact piece 46 does not come off the trigger coil 45 after mounting, and the trigger contact piece 46 can be reliably triggered without soldering. The coil 45 can be attached. Further, the contact end 46 b of the trigger contact piece 46 comes into contact with the back surface of the metallic reflector 47 constituting the strobe light emitting unit 7 as shown in FIG. 6.
[0018]
In such a trigger coil 45, when the sync switch 41 is turned on, a current flows from a trigger capacitor (not shown) to the primary side of the coil portion 45a, and a high voltage of several kV is applied to the output terminal 45c on the secondary side. Voltage current is output. Then, when a high voltage current flows through the trigger contact piece 46 in contact with the output terminal 45 c, the inside of the strobe discharge tube 36 is ionized to lower the electrical resistance, and the charge of the main capacitor 32 flows through the strobe discharge tube 36. Strobe light is emitted.
[0019]
The operation of the lens-equipped film unit strobe device having the above-described configuration will be described. In the manufacture of the strobe device, first, a pattern image of the strobe substrate 21 is printed, and after the resist is selectively etched with an etching solution, a circuit pattern is formed. Then, circuit components such as a resistor 23, a transistor 24, a coil 25, and a sync switch 22 are placed on the strobe board 21, and connected to a circuit pattern formed on the circuit board by batch automatic soldering by dip soldering. Fixed.
[0020]
Next, the stroboscopic light emitting unit 7 having the stroboscopic light emitting tube 36 and the like is attached to the upper part of the stroboscopic substrate 21, and the main capacitor 32 is further attached. The trigger contact piece 46 is attached to the output terminal 45 c of the trigger coil 45. As shown in FIG. 1A, the trigger contact piece 46 is attached by inserting the output terminal 45c into the engagement hole 46a of the trigger contact piece 46.
[0021]
Accordingly, the retaining plate 46c of the engagement hole 46a is pressed against the output terminal 45c by elasticity, and the output terminal 45c and the trigger contact piece 46 are brought into conduction. At the same time, the contact end 46 b contacts the back surface of the reflector 47. Further, since the retaining plate 46c is refracted in the penetration direction of the output terminal 45c, the trigger contact piece 46 is not detached from the trigger coil 45.
[0022]
As described above, the trigger contact piece 46 is elastically attached so that the output terminal 45c of the trigger coil 45 and the trigger contact piece 46 are pressed and attached, eliminating the need for time-consuming soldering, speeding up the assembly process, and reducing costs. Is achieved.
[0023]
In addition to the embodiment described above, the shape of the retaining plate of the trigger contact piece is, for example, the penetration of the output terminal 45c so as to surround the output terminal 45c of the trigger coil 45 from four sides as shown in FIG. The retaining plates 51a to 51d bent in the direction may be used. In the case of this embodiment, the contact area between the output terminal 45c and the trigger contact piece 52 is increased, and more reliable conduction is possible.
[0024]
Further, if a notch into which a part of the retaining plate bites into the tip of the output terminal is provided, the pressure contact between the trigger coil and the trigger contact piece becomes more reliable.
[0025]
【The invention's effect】
As described above, according to the present invention, a strobe discharge tube filled with gas, a trigger coil for generating a high voltage current for starting discharge in the strobe discharge tube, and the strobe discharge tube in contact with the strobe discharge tube. In the strobe device for a film unit with a lens attached to a film unit with a lens, the trigger contact has elasticity. The one end is pressed against the output terminal by the elasticity of a bent plate formed by being refracted in the penetration direction of the secondary output terminal of the trigger coil, and the other end is in contact with the strobe discharge tube. since the direction of the drag received from is in substantially the same direction as the penetration direction, the trigger of the film unit for a flash device By simplifying the piece mounting process and reducing assembly time, it is possible to reduce the manufacturing cost and reduce the equipment area required for the trigger piece mounting process, thereby enabling effective use of the manufacturing facility. .
[Brief description of the drawings]
FIG. 1 is an external perspective view showing a trigger coil and a trigger contact piece of a strobe device for a lens-fitted photo film unit embodying the present invention.
FIG. 2 is an external perspective view of a lens-fitted photo film unit incorporating the lens-fitted photo film unit strobe device according to the present invention.
FIG. 3 is an exploded perspective view of FIG. 2;
FIG. 4 is an external perspective view of a strobe device for a lens-fitted photo film unit embodying the present invention.
FIG. 5 is an enlarged perspective view of a pressure contact portion between a trigger coil and a trigger contact piece.
6 is a cross-sectional view of FIG. 3 when viewed from the side.
FIG. 7 is a second embodiment of the present invention.
[Explanation of symbols]
2 Film unit with lens 15 Strobe device 31 Strobe substrate 32 Sync switch 45 Trigger coil 45c Output terminal 46 Trigger contact piece 46a Engagement hole 46c Retaining plate

Claims (1)

A strobe discharge tube filled with gas, a trigger coil for generating a high voltage current for starting discharge in the strobe discharge tube, and a high voltage current output from the trigger coil in contact with the strobe discharge tube. A strobe device for a lens-fitted photo film unit that has a trigger contact piece that communicates to a strobe discharge tube and is attached to the film unit with a lens
Said trigger contact piece has elasticity, one end is pressed to the output terminal by the elasticity of the bent plate which is formed by refracted in penetration direction of the secondary side output terminal of the trigger coil and the other end, the strobe A stroboscope for a film unit with a lens, characterized in that a direction of drag received from the stroboscopic discharge tube in contact with the discharge tube is substantially the same as the penetration direction .

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