JP2000137269A - Flash light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flash light emitting device easily produced and having more excellent light distribution characteristic. SOLUTION: This device is constituted of a linear flash light emitting tube 1 and a reflector 2 constituted of upper and lower reflection surfaces positioned on the upside and the downside of the axis of the tube 1 and right and left reflection surfaces crossing with the axis of the tube 1, and having a rectangular aperture to emit light from the tube 1. The shape of the right and left reflection surfaces in terms of optional cross section parallel with the aperture has curvature at which the light from the tube 1 is diffused in an up-and-down direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device used for an image pickup device such as a camera, and more particularly to a flash light emitting device characterized by the shape of a reflector.

[0002]

2. Description of the Related Art Conventionally, in a flash light emitting device as an auxiliary light source, light emitted from a light emitting tube is reflected by a so-called reflector to efficiently irradiate a subject. Some of such flash light emitting devices have a cross-sectional shape corresponding to the short side direction formed to be substantially elliptical or a predetermined curved shape in order to improve the light distribution characteristics. The rays of light still remained a problem. For this reason, it has been considered that the side wall surface for effectively using the light is largely extended forward and the light is reflected forward.

FIG. 4 is a diagram showing a flash light emitting device having a flat side wall in such a case and its light distribution characteristics. As shown in the drawing, a relatively dark portion E and a bright portion C due to the side wall a are a boundary A, and a bright portion D and a relatively dark portion E due to the side wall b are a boundary B.
The distinction of light and dark has occurred respectively.

[0004] From such a problem, for example, Japanese Patent Application Laid-Open
Japanese Patent Application Laid-Open No. 177199 discloses a technique related to a camera strobe device in which both side walls of a reflector are curved in an arc shape.

[0005]

However, in the prior art, as shown in FIG. 5A, when the curved surface 100a is bent with respect to the plane portion 100 in the pressing step, bending is performed. There has been an inconvenience that the punch movement is impeded and sufficient bending cannot be performed. The present invention has been made in view of the above problems, and an object of the present invention is to provide a flash light emitting device which is easy to manufacture and has better light distribution characteristics.

[0006]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a linear arc tube, a vertical reflecting surface positioned above and below an axis of the arc tube, and the arc tube. In a flash light emitting device comprising a reflective umbrella having a rectangular opening that emits light from the arc tube, the left and right reflecting surface shape in an arbitrary cross section parallel to the opening is formed by the left and right reflecting surfaces intersecting the axis of the light emitting tube. There is provided a flash light emitting device having a curvature for vertically diffusing light from an arc tube.

According to a second aspect, a reflector having a cross section in the short side direction formed by a curved reflecting surface, and a straight tube type light emitting flash disposed in the reflector along the longer side direction. An arc tube,
The light-emitting flash light-emitting tube is provided near both ends thereof, and is extended to near the tip of the reflector, and has both side walls of a reflector that reflects light in a long side direction of the light-emitting tube. A flash light emitting device is provided, wherein the wall portion is formed to be curved in an arc shape toward the inside of the opening in a short side direction.

According to the first and second aspects, the following operation is achieved. That is, in the first aspect of the present invention, the shape of the left and right reflecting surfaces in an arbitrary cross section parallel to the opening is formed with a curvature for vertically diffusing light from the arc tube. In the second aspect, both side walls are formed to be curved in an arc shape toward the inside of the opening in the short side direction.

[0009]

FIG. 1 is a perspective view showing a configuration of a flash light emitting device according to an embodiment of the present invention, and FIG. 2 is a plan view of the flash light emitting device according to the embodiment. FIG.
2A is a side view of the reflector in the short side direction, and FIG.
FIG. 2B is a front view of the reflector in the long side direction, and FIG.
(C) is a top view in the long side direction of the reflector. Here, a configuration in which a flash arc tube is provided is shown.

The configuration and operation of the present embodiment will be described below with reference to these drawings. The reflector 2 of the flash light emitting device has a curved surface 2c having a predetermined curvature in a cross section in a short side direction of a portion in which the flash light emitting tube 1 for light emission is disposed. That is, in this embodiment, both side walls 2a, 2a,
2b is characterized by being curved in an arc shape inward. That is, 2a, 2b, 2d, 2e
The curved surface bites inward of the rectangular reflector opening formed by the plate portion of FIG.

A pair of side walls 2a, 2b of the reflector 2
Is formed in such a shape, the light of the flash arc tube 1 is diffusely reflected by the side walls 2a and 2b, and is applied to the subject with better light distribution characteristics.

The side walls 2a, 2b have their centers of curvature 2g, 2h (see FIG. 2) of their curvature located outside the reflector opening. The end portions 2i of the left and right reflection surfaces are only in contact with the end surfaces of the plate portion 2e.

FIG. 3 is a diagram showing light distribution characteristics of the flash light emitting device according to the embodiment. FIG. 3A shows the light distribution characteristics in the vertical direction, and FIG. 3B shows the light distribution characteristics in the horizontal direction. The vertical axis indicates the guide number, and the horizontal axis indicates the irradiation angle. From these figures, it can be seen that according to the flash light emitting device according to the present embodiment, the light of the flash light emitting tube 1 is uniformly irradiated in a relatively wide range in the vertical and horizontal directions.

The manufacturing process of the reflector 2 of the flash light emitting device according to the present embodiment will be described with reference to FIG.
Press processing is performed to bend the side wall of the reflector 2 to change the curvature. However, as described above, the side wall is warped toward the inside of the opening of the reflector 2 and does not hinder movement of the punch of the press. As a result, a portion 100b in the figure, the reflector side walls 2a, 2b of the present invention
Can form the reflector opening while maintaining its curvature. Further, even if a sufficient bending is not obtained in the manufacturing process, a desired bending 2f can be ensured by pressing and mounting with a further pressure when mounting to a strobe unit of a member such as a camera. Thus, the present invention, compared to the prior art,
It can be said that the manufacture of the reflector is easy.

As described above, in the flash light emitting device according to the present embodiment, given a predetermined curvature to both side walls 2a and 2b according to the same principle as a parabolic reflector or the like, the light emitted from the flash light emitting tube 1 is emitted. Uniform illumination of the subject to be photographed. The curvature of the both side walls is determined relatively in consideration of the average distance of the photographing subject assumed by the camera and the photographing angle of view, and in relation to the photographing screen determined by them.

The above embodiment of the present invention also includes the following invention. (1) In a flash light emitting device including a linear arc tube and a reflector having a rectangular opening for emitting light from the arc tube, a reflection surface intersecting with the axis of the arc tube is formed from the arc tube. A flash light emitting device having a curvature that diffuses light can be provided. (2) A flash light emitting device including a linear arc tube and a reflector having a rectangular opening for emitting light from the arc tube , A flash light emitting device can be provided in which a pair of reflecting surfaces intersecting with the axis of the arc tube have a curvature such that light from the arc tube is diffused, and (3) a linear arc tube and the arc tube In order to reflect and emit light from the light source, in a flash light emitting device consisting of a pair of reflectors having a pair of upper and lower reflectors and a pair of reflective surfaces on the left and right, the pair of curvatures on the left and right are diffused so as to diffuse light from the arc tube. Flash light emitting device having a reflective surface having (4) In a flash light emitting device including a linear arc tube and a reflector having a rectangular opening for emitting light from the arc tube, the reflection surface intersecting with the axis of the arc tube is: A light emitting device having a curvature that diffuses light from the arc tube and having the center of curvature located outside the opening can be provided.

[0017]

As described in detail above, according to the present invention,
A flash light emitting device that is easy to manufacture and has better light distribution characteristics can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a flash light emitting device according to an embodiment of the present invention, particularly showing configurations of a flash light emitting tube 1 and a reflector 2 which are features.

FIG. 2A is a side view of a reflector 2 in a short side direction.
(B) is a front view in the long side direction of the reflector 2, and (c) is a top view in the long side direction of the reflector 2.

FIG. 3A is a diagram showing light distribution characteristics in a vertical direction, and FIG.
FIG. 4 is a diagram showing light distribution characteristics in the left-right direction.

FIG. 4 is a diagram for explaining light distribution characteristics of a flash light emitting device according to the related art.

5A is a view showing a part of a manufacturing process of a reflector of a flash light emitting device according to the related art, and FIG. 5B is a diagram showing a manufacturing process of a reflector of the flash light emitting device according to the embodiment of the present invention. It is a part of it.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flash arc tube 2 Reflector 2a Side wall 2b Side wall 2c Plane reflector

Claims (2)

[Claims] 1. A rectangular arc tube comprising a linear arc tube, an upper and lower reflecting surface located above and below an axis of the arc tube, and a left and right reflecting surface intersecting with the axis of the arc tube, and emitting light from the arc tube. A flash luminous device comprising a reflector having an opening, wherein the shape of the left and right reflecting surfaces in an arbitrary cross section parallel to the opening has a curvature for diffusing light from the arc tube in a vertical direction. apparatus. 2. A reflector having a cross section in the short side direction formed by a curved reflecting surface, a straight tube light emitting flash tube arranged along the long side direction in the reflector, Provided near both ends of the light-emitting flash arc tube, extended to near the tip of the reflector, and both side walls of a reflector that reflects light in the long side direction of the arc tube; A flash light emitting device characterized in that both side walls are curved in an arc shape toward the inside of the opening in the short side direction.