JP2003315881A - Flash light emitting device and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flash light emitting device capable of stably emitting light with good irradiation efficiency, and a camera equipped with the flash light emitting device. <P>SOLUTION: By providing a saddle part projecting toward a light emitting tube and coming into surface-contact with the light emitting tube on a reflector which efficiently reflects flash light radiated from the light emitting tube, is provided in a state where it opens wider toward its front as a whole and surrounds the light emitting tube and having shape convex toward the light emitting tube on the back side of the light emitting tube and linearly contacting in a direction where the light emitting tube is extended, the light emitting tube is surely brought into contact with the reflector and a stable light emission from the light emitting tube is realized. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash light emitting device for emitting flash light and a camera provided with the flash light emitting device.

[0002]

2. Description of the Related Art Conventionally, in the field of flash light emitting devices,
It is required to increase the irradiation amount from the flash light emitting device.

The flash light emitting device has a mechanism in which flash light emitted from a cylindrical arc tube is reflected by a reflecting shade mounted so as to surround the arc tube, and the reflected light is irradiated toward the subject. As a method of improving the irradiation amount from this flash light emitting device, there is a method of increasing the capacity of a main capacitor that supplies electric power to the arc tube to increase the amount of flash light emitted from the arc tube. There is a problem in that it is costly to prepare a capacitor and the size becomes large.

In this regard, JP-A-13-318409
No., without changing the amount of flashlight emitted from the arc tube,
A method is described in which a reflecting shade efficiently reflects flash light to increase the irradiation amount of the reflected light toward the subject. The reflective shade used in this method is formed with a curve that opens wider toward the subject (front side) and has a convex portion toward the subject at the base portion (the innermost side) that contacts the arc tube. . The reflection shade and the arc tube are in line contact with each other in the extending direction of the arc tube at the convex portion. By using the reflective shade having such a shape, the flash light emitted from the arc tube is efficiently reflected by the reflective shade, and the irradiation amount of the reflected light toward the subject can be increased.

[0005]

However, in the reflector used in the above method, the contact portion with the arc tube has an acute edge due to its structure, and thus the contact with the arc tube is unstable. . Normally, a metallic reflector is used as a trigger electrode,
A high voltage is applied to this reflection shade, and a trigger voltage is applied to the arc tube from the contact portion with the reflection shade. Therefore, if the contact portion between the reflector and the arc tube is not stable, defective light emission may occur.

In view of the above circumstances, it is an object of the present invention to provide a flash light emitting device which has good irradiation efficiency and is capable of stable light emission, and a camera equipped with such a flash light emitting device.

[0007]

A flash light emitting device of the present invention that achieves the above object is provided with a cylindrical arc tube that emits flash light and a state in which the arc tube is widened toward the front and surrounds the arc tube. On the back side of the arc tube, there is provided a reflector that has a shape that is convex toward the arc tube and that is in line contact with the direction in which the arc tube extends. It is characterized in that it has at least one saddle portion that projects toward and makes surface contact with the arc tube.

Due to its shape, the reflector used in the flash light emitting device of the present invention effectively reflects the flash light emitted rearward (back side) from the arc tube toward the subject (front side). Further, since the saddle portion provided on the reflective shade is in surface contact with the arc tube, stable light emission from the arc tube is possible as compared with the conventional line contact.

The camera of the present invention for achieving the above object is a camera for taking a photograph of an object, which is equipped with a flash light emitting device for emitting flash light in synchronization with photographing, and the flash light emitting device has a cylindrical shape for emitting flash light. And a shape that is provided so as to surround the arc tube with a wider opening toward the front, and that is in line contact with the arc tube in a direction in which the arc tube extends, the back surface side of the arc tube being convex toward the arc tube. And a reflecting shade having at least one saddle portion on the back side of the arc tube, which projects toward the arc tube and makes surface contact with the arc tube. .

By providing the flash light emitting device of the present invention in a camera, the camera can be operated efficiently and stably as a camera that emits light.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

FIG. 1 is an external view of a camera according to an embodiment of the present invention.

The camera 10 includes a lens 100 for focusing on a subject and a light emitting window 2 for covering the surface of a flash light emitting section 200 (see FIG. 2) which emits light in synchronization with a release button 300.
01, and a release button 300 that is pressed at the time of shooting. Flash light emitting unit 2 built in the camera 10
00 is an embodiment of the flash light emitting device of the present invention.

The characteristic feature of the camera of this embodiment lies in the flash emission section 200, and the flash emission section 200 will be described below.

FIG. 2 is a perspective view showing a state in which the flash light emitting section 200 is mounted on the camera 10.

The flash light emitting section 200 is provided on the back side of the light emitting window 201, and is composed of a reflecting shade 210, a light emitting tube 220, an arm section 230, a reinforcing section 240, and a control section (not shown). Further, the reflective shade 210 includes the curved portion 21.
0a and a side surface portion 210b, and a saddle portion 210c protruding toward the front side. First, the flash emission unit 200
Each part of the above will be described.

FIG. 3 is a perspective view of the reflective shade 210.

The reflection shade 210 is formed by bending a conductive metal plate, and has a curved portion 210a for reflecting flash light emitted from the arc tube 220 of FIG. 2 and the arc tube 2 of FIG.
Side part 210 provided with hole 211 for mounting 20
b, a part of the curved portion 210a is configured by a saddle portion 210c formed by protruding toward the front side. Here, the curved portion 210a
The shape of the cross section will be described in detail.

FIG. 4 is a perspective view showing the reflection shade 210 as the arc tube 2 of FIG.
It is sectional drawing when it cut | disconnects by the surface perpendicular | vertical to the direction where 20 extends.

As shown in the cross-sectional view of FIG. 4, the reflective shade 210 has a U-shaped root portion (the innermost side) that is wider toward the front (front side), and has a convex edge toward the front. A shape having a convex portion 210d that is axisymmetric with respect to the center line A (hereinafter, a shape that has the convex portion 210d at the U-shaped root portion that widens toward the front is referred to as a U-shape with an edge). ). Here, when the arc tube 220 of FIG. 2 is attached to the reflection shade 210, it is more stable if the reflection shade 210 has a U-shaped cross section that does not have the convex portion 210d and is gently opened forward from the root portion. Contacts the arc tube 220.
However, since the U-shaped shape with an edge is a shape that efficiently reflects the flash light emitted from the arc tube 220 (see Japanese Patent Laid-Open No. 13-318409), the cross section with a U shape has an edge.
The reflection shade 210 having a letter shape is used. When the arc tube is attached to the U-shaped reflector having a cross section, the convex portion corresponding to the convex portion 210d in FIG. 3 of the reflector comes into line contact with the arc tube in the extending direction. Here, further, the arc tube 2
In order to stabilize the contact with 20, the reflective shade 210 is provided with a saddle part 210c. By providing the saddle portion 210c, the reflection shade 210 and the arc tube 220 are separated from each other by the saddle portion 21.
0c ensures surface contact. The reflection shade 210 corresponds to an example of the reflection shade of the present invention. The saddle portion 210c corresponds to an example of the saddle portion of the present invention.

Returning to the explanation of FIG. Arc tube 220 of FIG.
Has a substantially cylindrical shape, and when a voltage is applied to the reflecting shade 210, the voltage is supplied from the contact surface with the reflecting shade 210, and flash light is emitted radially at the center in the longitudinal direction.

The arm portion 230 is made of silicone rubber, and has a shape that presses the arc tube 220 from both ends as shown in FIG. 5, which will be described later. The arm section 230 holds both ends of the arc tube 220 and elastically holds the arc tube 220. Press on the reflective shade 210.

As shown in FIG. 5, the reinforcing portion 240 is formed by bending an insulator into a U shape and stabilizes the reflection shade 210 so that it does not move.

Here, a method of forming this flash light emitting portion 200 will be described.

FIG. 5 is an exploded perspective view showing the structure of the flash light emitting section 200.

In order to form the flash light emitting section 200 using the respective parts of FIG. 5, first, the arc tube 220 is passed through the hole 211 provided in the reflection shade 210.

Next, the reflection shade 210 is attached to the reinforcing portion 240, and the arm portion 230 holds both ends of the arc tube 220 so as to surround the reinforcing portion 240.

FIG. 6 shows the assembled flash light emitting unit 200.
FIG. 4 is a cross-sectional view taken along a plane perpendicular to the longitudinal direction of arc tube 220.

As shown in FIG. 6, the arc tube 220 surely comes into surface contact with the saddle portion 210c of the reflection shade 210. Although not shown in FIG. 6, the arc tube 220 has both ends shown in FIG.
Since it is held by the arm portion 230 of the lamp and is pressed against the rear side with the saddle portion 210c, the arc tube 220 and the reflection shade 21
The contact of 0 does not come off.

Returning now to FIGS. 1 and 2, the camera 1
The flash emission unit 2 shown in FIG.
The operation of each unit of 00 will be described.

First, the photographer points the camera 10 of FIG. 1 at the subject and presses the release button 300.

In synchronization with the release button 300 being pressed, a high voltage is applied to the reflection shade 210 of FIG. 2 from a control unit (not shown).

Next, the arc tube 220 is supplied with a voltage from the saddle portion 210c which is a contact surface with the reflection shade 210, and emits flash light radially at the center in the longitudinal direction.

The flash light emitted from the arc tube 220 is efficiently reflected by the curved portion 210a of the reflection shade 210 and is emitted toward the subject through the reflection window 200 of FIG.

At this time, since the reflection shade 210 is surely in contact with the arc tube 220, the arc tube 220 can realize stable light emission.

In the present embodiment, the reflective shade 210 made of metal has been described, but the reflective shade may be made of a conductor as long as it can supply an applied voltage to the arc tube. It is not limited to metal if it exists.

Further, in the present embodiment, an example in which the reflective shade is provided with two saddles has been described, but the saddle is for ensuring that the reflective shade and the arc tube are in contact with each other, and one or more saddles are provided. Anything that has

Further, in the present embodiment, the arc tube is fixed by using the arm portion and the reinforcing portion, but any means may be used for fixing the arc tube to the reflection shade.

[0039]

As described above, according to the present invention, it is possible to provide a flash light emitting device which has good irradiation efficiency and is capable of stable light emission, and a camera including the flash light emitting device.

[Brief description of drawings]

FIG. 1 is an external view of a camera to which an embodiment of the present invention is applied.

FIG. 2 is a perspective view showing a state in which a flash light emitting unit 200 is provided in the camera 10.

FIG. 3 is a perspective view of a reflective shade 210.

4 is a cross-sectional view of the reflective shade 210 cut along a direction perpendicular to the extending direction of the arc tube 220 of FIG.

5 is an exploded perspective view showing a configuration of a flash light emitting unit 200. FIG.

6 is a cross-sectional view of the flash light emitting section 200 taken along a plane perpendicular to the longitudinal direction of the arc tube 220. FIG.

[Explanation of symbols]

10 cameras 100 lenses 200 Flash emission part 201 reflective window 210 Reflective shade 210a curved part 210b side surface 210c saddle 210d convex part 211 holes 220 Light emitting part 230 Arm 240 Reinforcement part 300 release button

Claims (2)

[Claims] 1. A cylindrical arc tube that emits a flash of light, and a cylindrical arc tube that is widened toward the front and surrounds the arc tube, and is convex toward the arc tube on the back side of the arc tube. A reflector having a shape that makes a line contact in a direction in which the arc tube extends, wherein the reflector projects toward the arc tube and makes surface contact with the arc tube on the back side of the arc tube. A flash light-emitting device having one saddle part. 2. A camera for taking a picture of an object, comprising a flash light emitting device for emitting flash light in synchronism with photographing, wherein the flash light emitting device comprises a cylindrical arc tube for emitting flash light, and is wider toward the front as a whole. An opening is provided so as to surround the arc tube, and a reflecting shade is provided on the back side of the arc tube, the reflector having a shape that is convex toward the arc tube and is in line contact in the extending direction of the arc tube. The reflective shade has at least one saddle portion on the back side of the arc tube, the saddle section protruding toward the arc tube and making surface contact with the arc tube.