JPS6348537A - Fitting mechanism for flash discharge tube - Google Patents

Abstract

PURPOSE:To attain accurate mounting by providing an insulating elastic body which has a fitting groove for the center part opening of reflecting umbrella and an insertion recessed part for the insertion of a flash discharge tube at the inner periphery, fitting the discharge tube to the reflecting umbrella through the elastic body, and providing a through holes for a cathode and an anode electrode terminal to the recessed part. CONSTITUTION:The miniature lamp type flash discharge tube 10 has a cathode terminal 4 and an anode terminal 5, and an opening is circular; and recessed groove 42a formed at the outer periphery is fitted in a fitting hole 41a provided in the center of the reflecting umbrella 41, and the discharge tube 10 is inserted into the inner periphery of a rubber bush 42 and held with the elastic force of the rubber bush 42. Further, the glass outer peripheral surface of the discharge tube 10 is coated with a transparent conductive film consisting principally of tin oxide and then wound with a trigger line 43. The trigger line 43 is made of a spring type element wire in a coil spring shape and it is fitted onto the outer periphery of the discharge tube 10 while the inner diameter is made large, so that the discharge tube 10 is clamped with the elasticity of the trigger line 43. Consequently, the flash discharge tube is fitted to the reflecting umbrella easily, accurately, and stably.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a mechanism for attaching a microflash discharge tube to a strobe unit.

<Prior art> Conventionally, flash discharge tubes for strobes have a glass tube with a circular cross section filled with a rare gas such as mocenon at a predetermined pressure, and a cathode electrode and an anode at each end of the cylindrical straight glass tube. It has a structure in which an electrode is provided, a transparent conductive coating containing tin oxide as the main component is applied to the outer peripheral surface of the straight glass located between the tips of the anode electrode and the cathode electrode in the glass tube, and a trigger electrode is provided. Trigger B
A thin wire such as a nickel wire is wound around a portion of a glass tube coated with a transparent conductive coating as a lead wire for fEi.

When configuring the flash discharge tube according to the above configuration as a strobe unit, in order to efficiently irradiate a predetermined range with flash light, a concave opposite formed at least approximately as a rotating surface with respect to the optical axis of the flash discharge tube is provided, The flash discharge tube is disposed near or within the focal point inside the reflective shade.

The structure of the main body of the reflector in which the flash tube is placed is made of synthetic resin with vacuum-deposited aluminum on the surface of the main body, or metal such as bright aluminum with a mirror finish, and is arranged parallel to the discharge tube. It has a pair of reflective surfaces on the long side and a pair of reflective surfaces on the short side arranged perpendicularly to the discharge tube. The light distribution characteristic of the irradiated light by the short-side reflective surface is worse than the light distribution characteristic of the irradiated light by the reflective surface.

That is, there is a drawback that the utilization rate (yield) of light emitted from the flash discharge tube is poor. In order to correct this drawback, there is a method of increasing the depth of the reflective shade and increasing the frontage, but this method has the drawback of increasing the size of the electronic flash device.

As a way to solve the above-mentioned problem, by using a miniature flash discharge tube instead of a straight flash discharge tube and combining it with a reflective shade with a circular opening, a compact strobe unit with uniform light distribution characteristics can be provided. However, since the overall shape and electrode positions are completely different from the conventional straight pipe type, it was not possible to attach it to the reflective shade in the same way as the conventional straight pipe type.

Purpose of the present invention The object of the present invention is to provide a mounting mechanism which makes the light distribution characteristics uniform, and allows the mounting of the miniature bulb type flash discharge tube to a reflective shade with ease and accuracy.

<Example> Fig. 1 is a perspective view showing an example of a bulb-type flash discharge tube adopted in the flash discharge tube mounting mechanism according to the present invention, and Fig. 2 (a) and (b) are top views thereof. and a front view. Before explaining the attachment mechanism of the present invention, the bulb-type flash discharge tube will be explained.

In FIGS. 1 and 2, reference numeral 1 denotes a circular bottom plate made of ceramic, for example, and its outer periphery is surrounded by a glass tube 6 with a spherical tip indicated by a dashed line.

Shielding plates 7 and 8 are both made of ceramic or glass material, and the shielding plate 8 has a partially cut-off circular shape, and is arranged parallel to the bottom plate 1 at a predetermined distance. Moreover, the shielding plate 7 is vertically disposed approximately at the center of the bottom plate 1. By combining the shielding plates 7 and 8 in this way, the inside of the glass tube can be divided into four chambers.

Further, a cathode electrode 4 and an anode electrode 5 are connected to the bottom plate 1.
passes through the glass tube 6, and a sintered electrode 4a serving as a cathode electrode is provided inside the glass tube 6.

Furthermore, a transparent conductive film containing tin oxide as a main component is coated on the outer peripheral surface of the glass tube 6 and acts as a trigger electrode. A rare gas such as xenon is sealed in the glass tube 6, and a high voltage is applied between the cathode electrode 4 and the anode electrode 5, and a trigger voltage is applied to the trigger electrode to create a path from A to B-C in the figure. Electrons are emitted and arc discharge occurs, causing flash light emission.

FIG. 3 is a simplified perspective view showing an embodiment of a device mechanism for a reflective shade for the bulb-type discharge tube shown in FIGS. 1 and 2, according to the great invention, and FIG. It is. In FIGS. 3 and 4, reference numeral 10 is a bulb-type flash discharge tube shown in FIGS. 1 and 2, and has a cathode electrode terminal 4 and an anode electrode terminal 5.

Reference numeral 41 denotes a reflective shade, which has a circular frontage, has a protector 12 disposed on its front surface, and is fixed to the reflective shade 41 by a member (not shown). Reference numeral 42 denotes a rubber bushing made of silicone rubber, etc. As shown in FIG. The discharge tube 10 is inserted and the rubber bush 42
It is held by the elastic force of Further, a transparent conductive film containing tin oxide as a main component is applied to the glass outer peripheral surface of the discharge tube 10, and a wire wire 43 is wound around the glass outer peripheral surface. The trigger wire 43 is made of a spring wire, and has the shape of a torsion coil spring with at least 11/2 turns as shown in FIG. Accordingly, the spring property of the trigger wire 43 is configured to brocade the discharge tube IO. Also, the trigger? Both ends of J43 are
Both are bent into an abbreviated shape, and serve as a stopper after being penetrated through the hole 41b provided on the side surface of the reflective shade 41. By forming the trigger wire 43 into a torsion coil spring shape in this way, the flash discharge tube 10 is urged to be drawn downward in the assembled state shown in FIG. It will be held stable so that it does not occur.

Furthermore, since the electrode terminal of the discharge tube 10 is passed through the rubber bushing, it is possible to ensure high insulation between the electrodes, and as mentioned above, since the discharge tube 10 is inserted into the groove on the inner circumference of the rubber bushing, the discharge tube 10 is A concave groove 42 that can be stably held by the elastic force of the rubber bushing and is provided on the outer periphery of the rubber bushing.
Since the discharge tube is fitted into the mounting hole 41a of the reflective shade, the discharge tube can be easily and accurately attached to the reflective shade.

Effect> As explained above, the present invention provides an outer circumferential groove that fits into a mounting hole of the reflective shade and a hole for penetrating the electrode terminal of the flashlight discharge tube when a miniature flash discharge tube is attached to a reflective shade. Since the discharge tube is held using a rubber bush that has an inner peripheral groove for inserting the flash discharge tube, it has the advantage that the flash discharge tube can be attached to the reflector shade accurately, stably, and easily. This has the advantage that electrical insulation can also be ensured.

In the example, a miniature bulb-type discharge tube is used in which the inside of the glass tube is divided into multiple chambers by horizontal and vertical shielding plates, but other types of miniature bulb-type discharge tubes may be used. Of course, it can be used.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a flash discharge tube used in the flash discharge tube attachment mechanism according to the present invention, FIG. 2(a),
(b) is a top view and a front view of the discharge tube shown in the first diagram;
3 is a perspective view of a strobe unit having the attachment mechanism of the present invention, FIG. 4 is a central vertical sectional view of FIG. 3, and FIG. 5 is a perspective view showing the shape of the trigger wire 43 of the spring wire material of FIG. 4. FIG. 6 is a perspective view showing the shape of the rubber bushing 42 of FIG. 4. 10...Discharge tube, 41...Reflector shade, 421] Rubber bushing, 43... Trigger wire. Patent applicant to Canon Co., Ltd.■3rd Ward

Claims (2)

[Claims] (1) Attachment of a light-transmitting envelope having an opening at one end, a sealing plate that seals the opening of the envelope, and a flash discharge tube with cathode and anode electrode terminals arranged on the sealing plate to a reflective shade. In the mechanism, an insulating elastic body is provided which has a groove on the outer periphery that fits into the central opening of the reflective shade and a recessed part in the inner periphery into which the flash discharge tube is inserted, and the discharge tube is inserted into the reflective shade through the elastic body. 1. An attachment mechanism for a flash discharge tube, characterized in that the concave portion is provided with a through hole through which the cathode and anode electrode terminals pass. (2) A spring wire having a winding part that wraps around the outer periphery of the envelope of the flash discharge tube and an extension part extending from both ends of the winding part is provided, and the extension part of the spring wire material is The flash discharge tube attachment mechanism according to claim 1, wherein the flash discharge tube attachment mechanism is made to pass through a hole provided in a reflective surface of a reflective shade so that both ends are pulled in opposite directions.