JPH07270865A - Stroboscopic device - Google Patents

Abstract

PURPOSE:To provide a stroboscopic device provided with a large reflection mirror and capable of nearly uniformly irradiating the entire photographing image plane with strobe light without making the entire device larger. CONSTITUTION:A strobe light emitting part 16 is constituted of a stroboscopic discharge tube 25, the reflection mirror 26, a diffusing plate 27 and a pair of auxiliary reflection mirrors 20a and 20b. The reflection mirror 26 reflecting the strobe light toward a front surface is provided around the discharge tube 25. The diffusing plate 27 is attached to the front surface of the reflection mirror 26. The pair of auxiliary reflection mirrors 20a and 20b being one part of the strobe light emitting part 16 is pivotally attached to the front surface of a front cover 4 on the front surface of the diffusing plate 27. By combining the reflection mirror 26 and the auxiliary reflection mirrors 20a and 20b, the larger reflection mirror is formed as a whole.

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 in a camera and a film unit with a lens.

[0002]

2. Description of the Related Art Recently, a stroboscopic device for irradiating a subject with stroboscopic light by emitting light from a flash discharge tube is built into most compact cameras and lens-fitted film units as a standard, and is used for taking photographs at night, indoors, etc. Widely used.

Such a strobe device generally has a strobe discharge tube, a booster circuit for causing the strobe discharge tube to emit light, a strobe circuit board having a capacitor, etc., and a strobe light for efficiently diffusing the strobe light forward. It is composed of a diffusion plate, a reflecting mirror, and the like.

Of these, the above-mentioned reflecting mirror is for reflecting and condensing stroboscopic light, which is approximately uniformly irradiated from the stroboscopic discharge tube to the surroundings, so as to efficiently irradiate it only in the direction of the subject. The side facing the subject of the tube is an opening, and a certain distance is opened to cover the periphery of the stroboscopic discharge tube with a mirror surface inside for more than half the circumference.

By the way, in stroboscopic photography, unless the stroboscopic light is diffused almost uniformly over the entire screen, the central portion of the screen becomes overexposed, and the contrast of the shadow on the screen becomes extremely strong. The result is a stiff photo. For this reason, especially in person photography, in order to give a soft feeling, use a flash device with a large reflecting mirror (a large opening),
It is necessary to irradiate the stroboscopic light almost uniformly over the entire screen.

[0006]

However, if the reflecting mirror of the strobe device is enlarged for the above-mentioned reason, the entire strobe device inevitably becomes large, and a compact camera and a lens with a particularly small size are required. In a film unit or the like, the incorporation of such a stroboscopic device having a large reflecting mirror is a major obstacle.

However, on the other hand, even with a compact camera and a film unit with a lens, it is essential to improve the drawing performance during stroboscopic photography. While maintaining the features of small size and light weight, stroboscopic light is made almost uniform over the entire photographing screen. There is a growing need for irradiable strobe devices.

The present invention has been made in consideration of such circumstances, and provides a strobe device having a large reflecting mirror and capable of irradiating stroboscopic light substantially uniformly over the entire photographing screen without increasing the size of the entire device. The purpose is to do.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has one end rotatably mounted so as to be along a surface of a diffuser plate of a strobe device, which extends along a front surface of a reflecting mirror. This is provided with a pair of auxiliary reflection plates. In the second aspect, a pair of the auxiliary reflecting mirrors are provided on the four surfaces surrounding the open opening of the reflecting mirror so as to be substantially orthogonal to each other.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an external perspective view of a lens-fitted photo film unit incorporating a flash device embodying the present invention, and FIG. 3 is an exploded perspective view thereof. The lens-fitted photo film unit 2 incorporating the flash device embodying the present invention is roughly divided into a main body 3 having a photographing mechanism, and the main body 3.
It includes a front cover 4 and a rear cover 5 that cover the front and the rear, respectively.

The main body 3 is provided with a patrone chamber 6 for accommodating the photographic film cartridge, and a film chamber 7 for accommodating a roll-shaped film drawn from the photographic film patrone. A photographing mechanism 12 including a photographing lens 8, a shutter unit 9, a photographing number display plate 11 and the like is attached.

On the right side of the main body 3, the capacitor 1
3, strobe circuit board 1 with battery holder 14 etc. wired
5, and a strobe device 17 including a strobe light emitting portion 16, which will be described later in detail, is attached.

The front cover 4 is provided with holes for exposing the taking lens 8, the number-of-shots indicating plate 11, the viewfinder 18, the strobe light emitting portion 16 of the strobe device 17, and the like, and a release button 19 on the upper part. It is formed integrally. A charging switch 21 for the strobe device 17 is formed on the lower front portion of the front cover 4. Further, a pair of auxiliary reflecting mirrors 20a, which will be described in detail later, are provided at a portion where the strobe light emitting portion 16 is exposed on the upper portion of the front cover 4 front surface.
20b are rotatably attached to the upper and lower sides respectively.

The rear cover 5 is integrally provided with a bottom cover 22 and a bottom cover 23 of the film chamber.
And the bottom of the film chamber 7 are light-tightly covered.

FIG. 1 is a sectional view of the vicinity of a strobe light emitting portion in a lens-fitted film unit incorporating a strobe device embodying the present invention. The strobe light emitting unit 16 is
It comprises a strobe discharge tube 25, a reflecting mirror 26, a diffusion plate 27, and a pair of auxiliary reflecting mirrors 20a and 20b. The strobe discharge tube 25 is filled with xenon gas or the like, and has electrodes for discharge formed at both ends. Strobe discharge tube 2
Around the circumference of 5, a U-shaped reflecting mirror 2 for reflecting the strobe light emitted from the strobe discharge tube 25 in the front direction.
6 is provided. A diffusing plate 27 for diffusing the strobe light concentrated on the front surface by the reflecting mirror 26 is attached to the front opening of the reflecting mirror 26.

On the front surface of the diffusing plate 27, a pair of auxiliary reflecting mirrors 20a, 20a which are a part of the stroboscopic light emitting section 16 are provided.
b is rotatably attached to the front surface of the front cover 4.
The auxiliary reflecting mirrors 20a and 20b are arranged such that, in the use state as shown in FIG. 1, the mirror surface of the reflecting mirror 26 is extended as it is, and the inner surface thereof is the reflecting mirror 2a.
It is a mirror surface like No. 6. Such a combination of the reflecting mirror 26 and the auxiliary reflecting mirrors 20a and 20b forms a larger reflecting mirror as a whole. When the auxiliary reflecting mirrors 20a and 20b are not used, the auxiliary reflecting mirrors 20a and 20b are rotated to a folding position where they overlap each other as shown by a broken line A, so that the size of the stroboscopic light emitting section 16 is reduced.

The operation of the structure of the strobe device as described above will be described. When using the lens-fitted film unit 2 incorporating the strobe device 17 of the present invention, first, the auxiliary reflecting mirrors 20a and 20b on the front surface of the front cover 4 are drawn in solid lines from the folded position shown by the broken line A in FIG. Rotate and set to the indicated use positions. Next, the charging switch 21 is pressed to charge the condenser 13, and then the finder 18 is looked into to confirm the photographing range. Then, when the release button 19 is pressed, the strobe light emitting section 16 irradiates the subject with strobe light, and an image is taken.

FIG. 4 is an explanatory view showing irradiation of strobe light at the time of photographing. The strobe light emitted from the strobe discharge tube 25 is emitted from the subject 3 when the ordinary reflecting mirror 26 alone is used.
The area where the strobe light is strong spreads only to the area indicated by the broken line B behind 1, and overexposure occurs only in the central part of the screen, or the contrast of the shadow of the screen becomes extremely strong. The result is a very stiff photo, which is not desirable when shooting people.

However, when the auxiliary reflecting mirrors 20a and 20b are provided in the direction of the extension surface of the reflecting mirror 26 and a large reflecting mirror is formed as one body, the auxiliary reflecting mirror 2 is indicated by the arrow shown in FIG.
Due to the reflections of 0a and 20b, strong strobe light is evenly emitted in the peripheral direction of the subject and spreads behind the subject 31 to the range shown by the solid line C. As a result, the area with strong strobe light spreads almost evenly in front of the shooting range, and the contrast of the shadow on the screen is weakened, resulting in a soft-feeling photo overall, which is very pleasant especially when shooting people. It will be finished.

After the photographing is completed, the auxiliary reflecting mirrors 20a and 20b are provided.
When each of them is again rotated to the folding position of FIG. 1, the lens-fitted film unit 2 is kept compact without protruding from the surface of the front cover 4. Therefore, the auxiliary reflecting mirrors 20a and 20b do not hinder the carrying.

FIG. 5 is an external perspective view of a compact camera incorporating the strobe device of the present invention. In this embodiment, two pairs of auxiliary reflecting mirrors 37a, 37b, 38a, 38b are vertically and horizontally provided on the front surface of the stroboscopic light emitting portion 36 of the camera 35.
Each of which is pivotally attached. In the embodiment described above, of the strobe light emitted from the strobe light emitting unit, the light that is scattered in the vertical direction is applied to the subject almost uniformly, but in the present embodiment, the light that is further scattered in the left and right directions. Also reflects in the direction of the subject and illuminates the subject almost uniformly.

As a result, the strobe light emitted from the strobe light emitting section 36 is applied to the subject as effectively as possible.
Then, by illuminating the subject almost uniformly within the shooting screen, it is possible to prevent only the central part of the screen from being overexposed or the contrast of the screen shadow to become extremely strong. You can get an overall softer picture with reduced contrast.

In the camera 35, after the stroboscopic photography is finished, the auxiliary reflecting mirrors 37a, 37b, 38a, 38b are folded so as to face each other. 38
The a and 38b can be kept in a compact state without protruding.

[0024]

As described above, according to the present invention, the auxiliary reflection plate having one end rotatably attached to the diffuser plate of the strobe device is provided so as to be along the surface of the diffuser plate extending in the front direction. Since it is provided, without increasing the size of the strobe device as a whole,
It is now possible to provide a strobe device with a large reflecting mirror, which is capable of irradiating strobe light almost uniformly over the entire photographing screen.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of the vicinity of a stroboscopic light emitting section of a stroboscopic device embodying the present invention.

FIG. 2 is an external perspective view of a lens-fitted film unit having a built-in strobe device embodying the present invention.

FIG. 3 is an exploded perspective view of a lens-fitted film unit incorporating a strobe device embodying the present invention.

FIG. 4 is an explanatory diagram showing irradiation of strobe light at the time of shooting.

FIG. 5 is an external perspective view of a compact camera incorporating the strobe device of the present invention.

[Explanation of symbols]

 16 Strobe Light Emitting Unit 17 Strobe Device 20a, 20b Auxiliary Reflector 25 Strobe Discharge Tube 26 Reflector 27 Diffuser

Claims (2)

[Claims] 1. A strobe device having a strobe discharge tube, a reflector provided around the strobe discharge tube, one of which is open, and a diffuser plate provided on a front surface of the strobe discharge tube, wherein the diffusion is provided. A strobe device comprising a pair of auxiliary reflection plates, one end of which is pivotally attached so as to be along a surface extending from the reflecting mirror in the front direction of the plate. 2. The strobe device according to claim 1, wherein the auxiliary reflecting mirrors are provided in pairs on the four surfaces surrounding the opened opening of the reflecting mirror so as to be substantially orthogonal to each other. .