JPH05127228A - Stroboscopic device - Google Patents

Abstract

PURPOSE:To make a stroboscopic electric discharge tube to surely discharge with a lower voltage even though a stroboscopic device is an inexpensive and simple structure. CONSTITUTION:A light emission part is constituted of a diffusing plate 50, a reflector 51, the stroboscopic discharge tube 46 and a trigger electrode plate 47. The electrode plate 47 is formed by an electrical conductive thin plate. Then, both tips thereof which are bend in U-shaped to form a T-shaped hook and engaged with T-shaped holders 50a and 50b formed on the diffusing plate 50 so as to cover the reflector 51. The tube 46 is inserted from the side surface of the reflector 51 and disposed so that the back surface side thereof is covered with a bent part 51b having equal inside diameter to the outside diameter of the tube 46. Besides, the tube 46 is supported by supporting members 50c and 50d formed on the diffusing plate 50 so as to be pressed to the bent part 51b. The whole of the light emission part is fixed to a stroboscopic substrate 36 by engaging projections 50e, 50f and 50g formed on the diffusing plate 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strobe device structure.

[0002]

2. Description of the Related Art A lens-fitted film unit, which can be regarded as a kind of camera in which a film is built into a unit body in which a simple photographing mechanism is incorporated, is manufactured and sold by the applicant of the present invention so that a photograph can be taken easily at any time. It's being used. Among them, a film unit with a lens equipped with a strobe device such as "Sharun Run Flash" (product name) is also provided, so that you can enjoy good shooting even in dark places. In the strobe device used for such a lens-fitted film unit,
The structure of the strobe device is simplified because the cost is as low as possible. For example, its structure consists of a strobe discharge tube that discharges due to the electric charge stored in the main capacitor, and a reflector that houses and holds the strobe discharge tube and has a curved inner wall surface. It is designed to communicate to a strobe discharge tube. Conventionally, the curved surface of the reflector has a cross section of an ellipse cut in half with a short diameter, and the outer peripheral surface of the strobe discharge tube is arranged so as to be in contact with the curved surface.

[0003]

However, when the area of contact between the curved inner surface of the reflector and the outer peripheral surface of the strobe discharge tube is small, a larger voltage is applied when the trigger signal voltage is applied through the reflector. It had to apply voltage, which was a disadvantage. Therefore, even if a trigger signal is issued, sufficient voltage is not applied to discharge the strobe discharge tube, and strobe light emission cannot be obtained. Further, in the past, it was necessary to devise a technique such as applying a nesa coat (transparent conductive film) to the surface of the strobe discharge tube so that a larger voltage can be applied to the strobe discharge tube in order to cause a reliable discharge.

The present invention has been made in consideration of the above-mentioned problems of the prior art. In spite of being a strobe device having a low cost and a simple structure, it is possible to cause a reliable discharge at a lower voltage in the strobe discharge tube. , Strobe device is provided.

[0005]

In order to achieve the above object, in a strobe device in which a back surface of a strobe discharge tube is brought into contact with a reflector and a trigger voltage is applied to the strobe discharge tube through the reflector, the reflector is provided. A curved portion having an inner diameter equal to the outer diameter of the stroboscopic discharge tube is formed on the back side of the strobe discharge tube.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 3 showing the external appearance of a lens-fitted photo film unit 2 embodying the present invention, the unit main body 3 is mainly made of plastic and the whole is covered by an outer case 4. The outer case 4 includes a photographing lens 5, a viewfinder opening 6 including a viewfinder objective window 6a and a viewfinder eyepiece window 6b, a shutter button 7, a film counter display window 8, a winding knob 9, a light emitting section 10, a flash switch. Holes for exposing 11 are opened, and photographing operation and observation can be performed through these holes. The unit body 3 includes a body portion 20 and a front cover 2.
1, and a rear cover 22. As shown in FIG. 2, a film 23 with a cartridge is light-tightly housed between the main body 20 and the rear cover 22.

As the structure of the main body portion 20 and the rear cover 22, the structure described in Japanese Patent Application No. 2-24160 can be used as it is. A film 23 with a cartridge is partially exposed on the back surface of the main body 20.
An exposure unit 25 including a sprocket that engages with the perforations, a kicking lever, and a counter disk is incorporated in the main body base 24. Then, when the shutter button 7 is operated, the tip of the kick-off lever is instantaneously moved to open and close the shutter blades to perform exposure through the taking lens 5. The light emitting unit 10 is further provided on the upper right portion of the main body base 24.
The strobe unit 26 including is incorporated. When the switch plate 29 formed on the front cover 21 is pressed, the short-circuit plate 28 provided on the back surface of the front cover 21 short-circuits the charging start contact 27 of the strobe unit 26. The front cover 21 and the main body 20 are fixed to each other by the locking claws 30a and 30b, and the rear cover 22 and the main body 20 are locked by the locking claws 3.
It is fixed by 1a, 31b, 31c and the like. In addition,
A back cover 32 that can be easily released by a driver or the like is provided in a portion that covers the bottom surface of the cartridge chamber so that the exposed film 23 with the cartridge can be easily taken out.

The charging start contact 27 is connected in series with a power supply circuit 41 including a battery in the strobe circuit 40 as shown in FIG. The high voltage output from the power supply circuit 41 is the trigger capacitor 42 and the main capacitor 4
Charge 3 A trigger transformer 44 is connected to the trigger capacitor 42, and a contact piece 4 is attached to the primary winding 44a thereof.
The end of 5a has a strobe discharge tube 46 on the secondary winding 44b.
The trigger electrode plates 47 for starting the electric discharge of are respectively connected. The strobe discharge tube 46 has one end connected to the main capacitor 43 and the other end connected to the ground, and is discharged by the electric power stored in the main capacitor 43. The contact pieces 45a and 45b are interlocked with the exposure unit 25 so that they come into contact with each other at the same time as the shutter release, and a voltage is applied to the trigger electrode plate 47 at the same time as the shutter release.

As shown in FIGS. 1 and 4, the light emitting section 10 comprises a diffusion plate 50, a reflector 51, a strobe discharge tube 46 and a trigger electrode plate 47. The trigger electrode plate 47 has a conductive thin plate shape, and both ends of which are bent in a U shape form T-shaped hooks 47a and 47b. Further, from the center of the body portion 47c to the lead wire 47
d extends and the secondary winding 44 of the trigger transformer 44 is extended.
It is fixed to the secondary electrode 52 connected to b by soldering. The T-shaped hooks 47a and 47b engage with T-shaped holders 50a and 50b formed above and below the diffusion plate 50 so that the trigger electrode plate 47 covers the reflector 51. The strobe discharge tube 46 is inserted from an opening formed in the side surface portion 51a of the reflector 51, and is arranged so as to wrap the back side in a curved portion 51b having an inner diameter equal to the outer diameter of the strobe discharge tube 46.

The reflector 51 has an opening on the front surface, and the light emitted from the strobe discharge tube 46 is reflected forward on the upper, lower, left, right and rear surfaces of the inner wall. Curved portion 51 of reflector 51
The stroboscopic discharge tube 46 disposed in b is provided with a support member 50c, which has a U-shaped notch at the tip formed on the diffusion plate 50,
It is supported so as to be pressed against the curved portion 51b by 50d. Further, the body portion 47c of the trigger electrode plate 47 is
Since it is supported so as to be pressed toward the diffuser plate 50 while being in contact with the back of the reflector 51, the diffuser plate 50 as a whole is supported.
The reflector 51 and the flash discharge tube 46 are integrally held between the trigger electrode plate 47 and the trigger electrode plate 47. Further, the light emitting portion 10 is fixed to the strobe substrate 36 by the engaging projections 50e, 50f, 50g formed on the diffusion plate 50.

The operation of the lens-fitted film unit 2 configured as described above will be described. First, the photographer operates the winding knob 9 to charge the shutter and frame the subject through the viewfinder opening 6. The strobe switch 11 is pressed and the short-circuit plate 28 short-circuits the charging start contact 27. When the charging start contact 27 is connected, the power supply circuit 41 causes the trigger capacitor 4
2 and the main capacitor 43 are charged. The neon tube (not shown) provided behind the lens-fitted film unit 2 confirms that the charging is completed and the flash is ready to be fired, and the shutter button 7 is pressed to release the shutter.

When the shutter is released, the tip of the kick-off lever is instantaneously moved to open and close the shutter blades to perform exposure through the taking lens 5. At the same time, contact piece 4
5a and 45b contact each other, and the trigger capacitor 42 is discharged. When this discharge current flows through the transformer for trigger 44, a high voltage trigger voltage is generated in the secondary winding 44b, and this trigger voltage is applied to the strobe discharge tube 46 via the trigger electrode plate 47 and the reflector 51. As a result, the stroboscopic discharge tube 46 emits light and the subject is irradiated with stroboscopic light to perform stroboscopic photography.

Although the strobe discharge tube 46 emits light in this manner, a curved portion 51b having an inner diameter equal to the outer diameter of the strobe discharge tube 46 is formed on the reflector 51, and the curved portion 51b.
Since the back side of the strobe discharge tube 46 is wrapped around and adheres to the strobe discharge tube 46 in a wide range, the trigger voltage can effectively act on the strobe discharge tube 46 to surely cause the strobe discharge tube 46 to emit light. In addition, the formation of the curved portion 51b causes the inner surface of the reflecting umbrella 51 to protrude forward, and the strobe discharge tube 46
Since the light emitted from the back side of is reflected in a wide range toward the front side, it is also effective in obtaining a wide and uniform light distribution characteristic.

[0014]

As described above, according to the strobe device of the present invention, it is possible to cause a reliable discharge in the strobe discharge tube, even though the strobe device has a low cost and a simple structure. Furthermore, it is also very effective in that the utilization rate of the strobe light emitted from the back side of the strobe discharge tube is higher than that of the conventional strobe device.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of a flash device embodying the present invention.

FIG. 2 is an exploded perspective view of a film unit using a strobe device according to the present invention.

3 is an external perspective view of the film unit shown in FIG.

FIG. 4 is a cross-sectional view of main parts of the strobe device shown in FIG.

FIG. 5 is a circuit diagram of a flash device embodying the present invention.

[Explanation of symbols]

 2 Film unit with lens 3 Unit body 7 Shutter button 10 Light emitting part 11 Strobe switch 20 Body part 21 Front cover 22 Rear cover 23 Film with patrone 25 Exposure unit 26 Strobe unit 40 Strobe circuit 45a, b Contact piece 46 Strobe discharge tube 47 Trigger Electrode plate 50 Diffusion plate 51 Reflective umbrella 51b Curved part

Claims (1)

[Claims] 1. A strobe device in which a back surface of a strobe discharge tube is brought into contact with a reflector, and a trigger voltage is applied to the strobe discharge tube via the reflector, wherein the reflector has a curvature with an inner diameter equal to the outer diameter of the strobe discharge tube. The strobe device is characterized in that a curved portion is formed so that the back side of the strobe discharge tube is wrapped by the curved portion.