JPH0455312Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to the structure of the light emitting part of a flash device such as a camera strobe.

[Prior Art] As shown in Fig. 5, the light emitting section of a conventional flash device of this type includes a discharge tube 1 filled with xenon gas.
A silver paint 2 is formed on a part of the tube surface 1a over the arc length region, a conductive wire 3 is wound around the end of the silver paint 2, and the conductive wire 3 is connected to the output side of the trigger circuit 4. Ta.

As another means, as shown in FIG.
A conductive wire 3 was wound around the end of the conductive material Nesa coating 5, and the conductive wire 3 was connected to the output side of the trigger circuit 4.

The conventional discharge tube 1 shown in FIGS. 5 and 6 includes:
A voltage of 200 to 300 V is applied between the anode and cathode, and from the output side of the trigger circuit 4, the xenon gas in the discharge tube 1 is ionized via the conductive wire 3 and the silver paint 2 or Nesa coating 5 to discharge an arc. This was done to produce a flash of light, which was then distributed using a reflector (not shown).

[Problems to be Solved by the Invention] The light emitting part of the conventional flash device described above includes a step of forming silver paint 2 or Nesa coating 5 on the tube surface 1a of discharge tube 1, and an end portion of the silver paint 2 or Nesa coating 5. Since there is a step of winding the conductive wire 3 on top, the manufacturing process not only takes time and is troublesome, but also contributes to high costs. Furthermore, since a portion of the light is absorbed by the silver paint 2 or the Nesa coating 5 portion during light emission, it is necessary to increase the discharge energy by the absorbed amount in order to maintain the desired amount of light emission.

The present invention was devised to solve the above problems, and its purpose is to completely cover the surface of the discharge tube without forming a conductive material such as silver paint or Nesa coating on the surface of the discharge tube. By bringing the part into direct surface contact with the reflector over the arc length region, light absorption on the surface of the discharge tube is eliminated, discharge can be performed at a relatively low voltage, and the manufacturing process is simplified. It is an object of the present invention to provide a structure of a light emitting part of a flash device, which reduces the accompanying cost.

[Means for Solving the Problems] A light emitting unit structure of a flash device according to the present invention is a light emitting unit of a flash device including an elongated rod-shaped discharge tube and a reflecting plate that reflects flash light from the discharge tube. The longitudinal surface of the discharge tube is directly brought into surface contact with a curved concave surface having the same curvature as the discharge tube formed on the reflection plate, without forming a conductive material connected to a trigger circuit on the surface of the discharge tube. At the same time, the reflector plate and the trigger circuit are electrically contacted.

[Operation] Arc discharge voltage is applied between the anode and cathode of the discharge tube. On the other hand, when a high voltage is applied to the reflector from the output side of the trigger circuit, it is sealed into the discharge tube via the tube surface in the arc length region along the longitudinal direction of the discharge tube that is in contact with the curved concave surface of the reflector. The rare gas in the atmosphere will be ionized, arc discharge will occur, and light will be emitted.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

The light emitting part of a flash device such as a camera strobe is
As shown in the enlarged exploded perspective view of the figure, it is provided with an elongated rod-shaped discharge tube 10 and a reflector plate 11 that reflects and distributes the flash of light from the discharge tube 10. discharge tube 10
A rare gas such as xenon or krypton is sealed inside. Further, both ends of the discharge tube 10 are provided with an anode 10a and a cathode 10b, and the tube is made of transparent heat-resistant glass such as quartz glass.
There is no need to form a conductive material such as silver paint or Nesacoat on the surface of the tube for connection to the output side of the trigger circuit 12 as in the past, and it is sufficient to simply use a transparent heat-resistant glass tube as is. . The discharge tube 10 is mounted on a parabolic reflector 11 as shown in FIGS. 1-3.

Although the reflecting plate 11 is formed of a thin plate material such as aluminum, it does not necessarily have to be parabolic as in this example, and may be formed in any appropriate shape depending on its intended use. Further, a predetermined portion of the reflector 11 (in this example, a portion along the top of the paraboloid) is provided with the discharge tube so as to be in direct surface contact with the tube surface 10c in the arc length region along the longitudinal direction of the discharge tube 10. A curved concave surface 11a having the same curvature as the tube 10 is formed. The curved concave surface 11a that makes surface contact with the discharge tube 10 needs to be in surface contact over the arc length region of the discharge tube 10, but the area of the curved concave surface 11a is determined by comparing light distribution, light amount, etc. . In this example, 15 of the 10 circumferences of the discharge tube
By covering % or more with the curved concave surface 11a,
We were able to obtain the same minimum trigger output (at no load) voltage of 200V as when applying Nesa coating to a conventional discharge tube.

13 is a frame made of plastic, and a parabolic reflector 11 is attached to the frame 13. Both ends of the discharge tube 10 inserted into the curved concave surface 11a of the reflection plate 11 are held by the holding member 13a of the frame 13.
The discharge tube 10 is held in an elastic manner by the curved concave surface 11a, and the discharge tube 10 is fixed in close contact with the curved concave surface 11a. Furthermore, a conductive plate 14 such as a thin copper plate is stretched on the inside and side walls of the frame 13, as shown by diagonal lines in FIGS. ing. Reference numeral 15 indicates wiring that electrically connects the conductive plate 14 and the output side of the trigger circuit 12. In the figure, 16 indicates a diffusion panel that covers the reflection plate 11.

Next, how to use it will be explained.

As shown in FIG. 3, the anode 10a of the discharge tube 10
An arc discharge voltage is applied between the capacitor and the cathode 10b from a capacitor shown in FIG. On the other hand, trigger circuit 1
From the output T side of 2, the conductor plate 14 is connected via the wiring 15.
Apply high voltage to. The high voltage applied to this conductive plate 14 is applied to the reflective plate 1 which is in contact with the conductive plate 14.
1, the curved concave surface 1 of the reflecting plate 11
The rare gas sealed in the discharge tube 10 is ionized through the tube surface 10c along the longitudinal direction of the discharge tube 10 that is in contact with the tube 1a, causing arc discharge and emitting light. The emitted light is reflected by reflector 1
1 and distributed in a predetermined direction.

[Effects of the invention] As can be seen from the above description, the present invention provides a light-emitting section of a flash device that includes an elongated rod-shaped discharge tube and a reflector that reflects flashlight from the discharge tube. The tube surface in the longitudinal direction of the discharge tube is brought into direct surface contact with a curved concave surface having the same curvature as that of the discharge tube formed on the reflection plate, without forming a conductive material connected to a trigger circuit, and the reflection plate and Since it is electrically connected to the trigger circuit, there is no need to form a conductive material such as silver paint or Nesa coating on the surface of the discharge tube as in the conventional method. As a result of bringing the portion into direct surface contact with the reflecting plate over the arc length region, light absorption on the tube surface of the discharge tube is eliminated, and stable and reliable discharge can be achieved at a relatively low voltage. In addition, it is possible to reduce costs due to the simplification of the manufacturing process, making it extremely economical as a structure for the light emitting part of a flash device, and has extremely high utility value in this type of field.

[Brief explanation of the drawing]

Fig. 1 is an enlarged exploded perspective view showing an embodiment of the invention, Fig. 2 is an enlarged side view of the invention, Fig. 3 is an enlarged front view of the invention, and Fig. 4 is a circuit diagram of the invention. 5
6 are enlarged perspective views showing conventional examples. 10...discharge tube, 10c...tube surface, 11...
Reflector plate, 11a...Curved concave surface, 12...Trigger circuit, 14...Conductor plate, 15...Wiring.

Claims (1)

[Scope of utility model registration request] In the light-emitting part of a flash device that includes a long and thin rod-shaped discharge tube and a reflector that reflects flashlight from the discharge tube, the discharge can be performed without forming a conductive material on the surface of the discharge tube to be connected to a trigger circuit. A flash device characterized in that the tube surface in the longitudinal direction of the tube is brought into direct surface contact with a curved concave surface formed on the reflection plate and having the same curvature as the discharge tube, and the reflection plate and the trigger circuit are electrically connected. The structure of the light emitting part.