JPH06250269A - Diffusion plate unit of stroboscopic device - Google Patents

Abstract

PURPOSE:To provide the inexpensive stroboscopic device by enabling regenerated materials to be used. CONSTITUTION:A diffusion plate unit 13 consists of a stroboscopic diffusion plate 14 and a transparent plate 15. The stroboscopic diffusion plate 14 is formed by using the regenerated material of a transparent acrylic resin. The transparent plate 15 consists of a polyethylene terephthalate (PET) film compounded with a benzophenone UV absorbent and is arranged under the stroboscopic diffusion plate 14. The thickness of the transparent plate 15 is 0.01 to 1.50mm and is more preferably specified to about 0.3mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diffuser unit for a strobe device, and more particularly to a diffuser unit for a strobe device which can be manufactured at low cost.

[0002]

2. Description of the Related Art A camera having a built-in strobe device is known so that it can be photographed at night or indoors. This strobe device basically has a discharge tube that emits light in response to a trigger signal, a reflector that reflects the light projected from the discharge tube behind the discharge tube toward the front, and a discharge tube that emits toward the front. It is composed of three parts: a diffusing plate that diffuses dripping light vertically and horizontally. Further, the diffuser plate is manufactured by injection molding using a transparent plastic material, and various additives are blended with this plastic material in order to adjust its transmission wavelength range and to prevent static electricity.

On the other hand, the present applicant manufactures and sells a lens-fitted film unit in which a film is preliminarily built in a unit body incorporating a photographing mechanism such as a photographing lens and a shutter device. The film unit with a lens has a very simple structure in which the focus adjustment mechanism and the exposure adjustment mechanism are omitted, as is known from Japanese Patent Publication No. 2-36151, and it is easy for anyone to enjoy shooting. The advantage is that they can be received and offered at a low price. Some of these lens-fitted film units are equipped with strobe devices such as "Sharp Run Flash" (trade name), and the strobe device used for this needs to be as low cost as possible. It is said that.

As described above, the strobe device is widely used in various cameras such as a film unit with a lens and a compact camera, and the demand for the strobe device tends to further increase. Therefore, it is important to reduce costs by mass production and to effectively use resources, and it is considered to use recycled materials as a material for the diffusion plate.

[0005]

However, it is difficult to uniformly disperse the additive in the recycled material of the plastic material, because the particle diameter of the recycled material is not uniform. Therefore, when using a recycled material, it is necessary to mix the additive in a specified amount or more, and to pelletize the recycled material again to make the particle diameters uniform and then knead the additive. It will invite up. Further, since the mechanical properties and heat resistance are also deteriorated, it is actually difficult to use the recycled material.

The present invention has been made in consideration of the above circumstances, and an object of the present invention is to provide a diffusion plate unit for a strobe device which enables the use of recycled material and is inexpensive.

[0007]

In order to achieve the above object, the present invention adjusts the quality of light emitted from a strobe diffuser plate injection-molded using a transparent resin material and a strobe discharge tube. A diffusion plate unit is constructed by stacking a transparent plate containing an additive for this purpose. Further, the transparent plate is preferably made of a polyethylene terephthalate film having a thickness of 0.01 to 1.50 mm, and a benzophenone-based ultraviolet absorber is preferably used as an additive to be added to the transparent plate.

The diffusing plate unit according to the fourth and fifth aspects is for adjusting the light quality of the light emitted from the stroboscopic discharge tube on the surface of the stroboscopic diffusing plate injection molded using a transparent resin material. The additive solution is applied. Also,
The additive solution is preferably a benzophenone-based ultraviolet absorber dissolved in benzene.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows the external appearance of a lens-fitted film unit (hereinafter referred to as strobe-equipped film unit) having a built-in strobe device. The unit main body 1 is mainly formed by plastic molding, a simple photographing mechanism and a strobe are incorporated, and a 135 film with a cartridge is preloaded so that it cannot be taken out by a user. The unit main body 1 is covered with an outer case 2 whose outer surface is printed to make its appearance beautiful, and a photograph is taken with the outer case 2 left in the outer case 2.

A photographing lens 3 is arranged in the center of the front surface of the unit body 1. A finder 4 is provided above the taking lens 3, and a strobe light emitting section 5 is arranged on the right side of the finder 4. A strobe charge switch 6 is provided below the strobe light emitting section 5. A shutter button 7, a winding knob 8, and a display window 9 for confirming the number of remaining films are provided on the upper surface of the unit main body 1.

1 and 2 show the structure of a strobe device. The strobe discharge tube 10 that emits light during stroboscopic photography is a reflector 1 whose rear side is open on the light irradiation side.
It is covered by 1. The reflector 11 has a trigger electrode plate 12 attached to one end, and the opening surface thereof is set to a diffusion plate unit 13
It is blocked by. The diffusion plate unit 13 is composed of a strobe diffusion plate 14 and a transparent plate 15, and diffuses the light emitted from the strobe discharge tube 10 and the light reflected by the inner surface of the reflector 11 out of this light. In addition, the lead terminals 10a, 1 protruding from both ends of the strobe discharge tube 10
0b is the through holes 16a, 16 of the strobe substrate 16.
Then, one end of the trigger electrode plate 12 is connected to the secondary electrode of the trigger transformer.

The strobe diffusion plate 14 is made of a transparent acrylic resin recycle material, and is injection molded so that its diffusion surface 14a is a flat plate type. The transparent plate 15 is made of a polyethylene terephthalate (PET) film containing a benzophenone-based ultraviolet absorber,
It is sandwiched between the strobe light diffuser plate 14 and the unit body 1. The transparent plate 15 has a thickness of 0.01 to 1.
It is 50 mm, preferably about 0.3 mm.

The material of the transparent plate 15 is
It suffices that the light flux of the strobe discharge tube 10 and the reflected light from the reflector 11 are transmitted and the additive can be uniformly blended. For example, a synthetic resin or glass other than the polyethylene terephthalate may be used. Further, the additive to be blended may be one that can adjust the light quality such as the wavelength range of the light emitted from the strobe discharge tube 10, and a plurality of additives may be added for improving heat resistance and preventing electrification. You may mix.

Next, the operation of the present invention will be described. In the molding process of each member constituting the film unit with strobe, the strobe diffusion plate 14 is injection-molded by using a recycled material of acrylic resin. At this time, since the additive is not mixed with the molding material, it is not necessary to pelletize again to make the particle diameters uniform, and the recycled material can be used as it is. Therefore, it can be used without deteriorating the mechanical properties and heat resistance of the material. Furthermore, since the outer shape is the same as that of the conventional diffusion plate, it can be molded using an existing mold.

In the process of assembling the strobe device, the reflector 11 to which the trigger electrode plate 12 is attached is fitted into the strobe diffusion plate 14 after the strobe discharge tube 10 is inserted. Then, the lead terminals 10a and 10b protruding from both ends of the strobe discharge tube 10 are bent at a right angle, and the respective tips are inserted into the through holes 16a and 16b of the strobe board 16 and soldered. One end of the trigger electrode plate 14 is connected to the secondary electrode of the trigger transformer. Further, the transparent plate 15 is attached to the front surface of the strobe diffusion plate 14 when the strobe device is incorporated into the strobe film unit, and is sandwiched between the unit body 1.

When a photographer purchases a film unit with a strobe and takes a picture, first, the winding knob 8 is used.
The shutter is charged until the rotation is locked, and the shutter is charged to prepare for shooting. This shutter charge operation causes a switch (not shown) for driving the strobe device.
Is turned on and flash photography is possible.

At the time of stroboscopic photography, the strobe charging switch 6 provided on the front surface of the film unit with a strobe is pressed to charge the main capacitor for stroboscopic light emission. Then, the flashing cycle of the neon lamp that informs the charging status is shortened, and the charging is completed when the neon lamp turns on. After the charging is completed, the subject is framed to an appropriate position through the viewfinder 4 and the shutter button 7 is operated. The strobe discharge tube 10 emits light in synchronization with this shutter release, and the photographing screen on the photo film is exposed.

At this time, the light emitted from the strobe discharge tube 10 and the light reflected toward the front by the inner surface of the reflector 11 out of this light are transmitted through the transparent strobe diffusion plate 14,
Reach the transparent plate 15. Since the transparent plate 15 is blended with a benzophenone-based UV absorber, the strobe light absorbs the UV energy and the light quality thereof is adjusted. .

When one shot is finished, the winding knob 8
Rotate to wind up the exposed photographic film. Then, when the rotation of the winding knob 8 is locked, the preparation for the next photographing is completed, and the photographing can be performed again.

When the exposure is repeated as described above and "0" appears in the display window 9 for displaying the number of remaining films, it means that the whole frame photographing is completed. Then, if you take the film unit with strobe to a development shop and request DPE, the film development and print processing are performed by the conventional processing, and a print photograph can be obtained.

In the above embodiment, the transparent plate is arranged on the front side of the stroboscopic diffuser plate, but as shown in FIG.
The transparent plate 22 may be arranged inside the strobe diffusion plate 21, and the reflective umbrella 11 may press and fix the strobe diffusion plate 21. Further, at this time, in order to securely fix the transparent plate 22, the peripheral edge of the transparent plate 22 and the strobe diffusion plate 21 may be bonded. According to this embodiment, the light emitted from the strobe discharge tube reaches the strobe diffusion plate after absorbing the ultraviolet energy by the transparent plate, so that the deterioration of the resin strobe diffusion plate due to the ultraviolet rays can be prevented. Further, since the transparent plate is built in the strobe device in advance, the strobe device can be easily incorporated into the unit body.

Further, in the above-mentioned embodiment, the transparent plate containing the additive and the stroboscopic diffuser plate are separate bodies.
As shown in FIG. 5, the additive solution may be directly applied to at least one of the surfaces 31a and 31b of the strobe diffusion plate 31. Further, as the additive solution, it is preferable to use a solution in which a benzophenone-based ultraviolet absorber is dissolved in benzene. It should be noted that the additive to be blended may be one capable of adjusting the light quality such as the wavelength range of the light emitted from the strobe discharge tube 10, and a plurality of additives may be added to improve heat resistance and prevent electrification. You may mix. Further, the solvent is not limited to benzene as long as it can dissolve the additive.
Since the diffuser plate unit of this embodiment has the same outer shape as one diffuser plate, it can be easily handled and incorporated into a strobe device.

[0023]

As described above, according to the present invention, since the transparent plate containing the additive for adjusting the light quality is arranged so as to be superposed on the stroboscopic diffuser plate, it is inexpensive as a molding material for the stroboscopic diffuser plate. Since it is possible to use various recycled materials as they are, it is possible to provide a cheap strobe device.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a flash device including a diffusion plate unit of the present invention.

FIG. 2 is a side sectional view of the strobe device of FIG.

FIG. 3 is an external view showing a strobe-equipped film unit including the strobe device of FIG.

FIG. 4 is a side sectional view showing a second embodiment of the diffusion plate unit.

FIG. 5 is a side sectional view showing a third embodiment of the diffusion plate unit.

[Explanation of symbols]

 10 Strobe Discharge Tube 11 Reflector 13,20,30 Diffusion Plate Unit 14,21,31 Strobe Diffusion Plate 15,22 Transparent Plate

Claims (5)

[Claims] 1. A stroboscopic device for diffusing light emitted from a stroboscopic discharge tube and light reflected by the inner surface of a reflector to illuminate a subject in a stroboscopic device by injection molding using a transparent resin material. Strobe diffuser plate and a transparent plate which is placed so as to overlap the strobe diffuser plate and which is mixed with an additive for adjusting the light quality of the light emitted from the strobe discharge tube. The diffuser unit of the device. 2. The diffusion plate unit for a strobe device according to claim 1, wherein the additive is a benzophenone-based ultraviolet absorber. 3. The transparent plate has a thickness of 0.01 to
3. The diffusion plate unit for a strobe device according to claim 1, which is made of a transparent polyethylene terephthalate film having a thickness of 1.50 mm. 4. A strobe device for diffusing light emitted from a strobe discharge tube and light reflected by the inner surface of a reflecting umbrella and irradiating the subject to the strobe discharge injection molding using a transparent resin material. A diffuser unit for a strobe device, characterized in that an additive solution for adjusting the light quality of the light emitted from the strobe discharge tube is applied to the surface of the strobe diffuser plate. 5. The diffusion plate unit for a strobe device according to claim 4, wherein the additive solution is a benzophenone-based ultraviolet absorber dissolved in benzene.