JPS58100353A - Micro-wave electric-discharge light source device - Google Patents

Abstract

PURPOSE:To realize a homogeneous luminance easily by providing a discharge- lamp supporting member in such a manner that it is coaxial with the rotationally symmetrical axis of a cavity wall; the supporting member influences upon the light path to a small extent, and the influence is rotationally symmetrical. CONSTITUTION:In order to facilitate initiation of the electric discharge of an electric-discharge lamp 6, a discharge-initiating auxiliary body 13 is buried inside the lamp 6. The outer surface of the lamp 6 is provided with a screw thread 6c which is fitted into the screw hole 14a of a supporting member 14. The projection 6b of the lamp 6 is fitted into the hole 14a so as to fix the lamp 6. In a device which is constituted in such a manner as above, since the supporting member 14 is provided in such a manner that it corresponds to the rotationally symmetrical axis of a cavity wall 4, light traveling outward through the mesh surface is hardly shut off directly. In addition, even if there is any influence on the light path, the influence always is rotationally symmetrical. As a result, the shape of the cavity wall 4 can be easily designed in such a manner that a homogeneous illuminance distribution is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microwave discharge light source device that utilizes light emission by microwave discharge.

Figure 1 is a longitudinal cross-sectional view showing the configuration of a conventionally proposed microwave discharge light source device, in which (1) is a magnetron, (2)
is a magnetron antenna, (3) is a waveguide, (4) is an empty Is wall whose inner wall shape is rotationally symmetrical, (51 is a joint between the cavity wall (4) and the waveguide (3) (61 is a spherical electricless, polar discharge lamp, (61L) is a supporting projection formed integrally with the tube body, (7) is a fan, (8) is a A vent provided in a part of the waveguide (3), (9) is a metal mesh plate that covers the front surface of the cavity wall (4), and connects the cavity wall (4) with the microwave cavity az.
It consists of The trout uses a magnetron (1) and a waveguide (3).
), the box body that covers the cavity, etc., all are supporting protrusions (6a
) is a support member formed of a low-loss dielectric material such as quartz glass that supports the discharge lamp (6) by fitting into the discharge lamp (6).

Next, the operation will be explained. The microwaves generated by the magnetron (1) are sent to the magnetron antenna (2).
is radiated through the waveguide (3).

This microwave propagates through the waveguide (3) and feeds into the feed port (5).
) is radiated into the cavity a'a, forming a microwave electromagnetic field in the cavity a'a. Due to this microwave electromagnetic field, the Ganu in the 'Ml electric lamp (61) discharges, the inner wall of the discharge lamp ripens, the metal such as mercury sealed in the tube is heated and evaporated, and the discharge is a discharge of metal gas. , and light with a specific emission spectrum depending on the type of encapsulated metal is emitted.In order to effectively utilize this light, the rear surface of the cavity wall (41) forms a reflective surface, and the front surface is It is covered with a metal mesh plate (91) that does not allow waves to pass through, but allows light to pass through, so that light is projected only forward.

Discharge lamp (61 is spherical and can be approximated as a one-point light abyss, so
The shape of the cavity wall (410 reflection surface is rotationally symmetrical).

By setting this shape appropriately, it is easier to obtain a desired illuminance distribution within a circular area, for example, uniform illuminance. Note that since the discharge lamp (61) can be placed in a position where the microwave electromagnetic field distribution within the cavity fi is less likely to change, there is little unevenness in light emission, which is advantageous in obtaining a uniform illuminance distribution.

However, the support member I is attached to the discharge lamp (
61 and is located at a position where the optical path, especially the reflected light, passes, so it casts a shadow on the irradiated surface. Alternatively, if the support member αD is made of a transparent material such as quartz glass, the optical path will be bent and the uniformity of illuminance on the irradiated surface will be impaired.

This invention was made to eliminate the above-mentioned drawbacks of the conventional ones, and by providing the support member at a position that coincides with the rotational symmetry axis of the cavity wall, the uniformity of illuminance on the irradiated surface can be improved. It is designed to be easily obtained.

FIG. 2 is an enlarged sectional view of the main parts of an embodiment of the present invention.
aa is a cylindrical discharge lamp support member made of a low-loss dielectric material such as quartz lath, whose axis is aligned with the cavity wall (410 axis of rotational symmetry), and a hole with a screw ( 1
45L). (6b) is a support protrusion formed integrally with the tube body of the discharge lamp (6), and a discharge starting auxiliary body is buried inside to facilitate the start of discharge of the discharge lamp (6). A screw (6C) is formed on the outer surface to be screwed into the screw hole (14a) K of the support member a-, and this protrusion (6b) is screwed into the screw hole (14a) of the support member aa to complete the discharge lamp (6).
) to be fixed.

In the device configured as described above, the support member 04
1 is provided so as to coincide with the axis of rotational symmetry of the cavity wall (4), so there is almost no direct blocking of light exiting from the mesh surface to the outside. or.

Even if there is an effect on the optical path, it is only a rotationally symmetrical effect, so it is easy to design the cavity wall shape to obtain a uniform illuminance distribution.

FIG. 3 is an enlarged sectional view of another embodiment of the present invention, in which a presser foot 7 langie is attached to the curved flange of a rotationally symmetrical cavity wall (4) having a microwave power supply port (5) on the side. A metal mesh plate (9) is attached to the holding screw. moreover,
The discharge lamp support part (112) provided at the top of the cavity wall (41)
), one end of a cylindrical discharge lamp support member (uQ) is supported so that its axis coincides with the rotational symmetry axis of the cavity W (4), and a flared discharge lamp support part ( tl
ta) The projection (6a) of the K discharge lamp (6) is fitted to support the discharge lamp (6). In this way, from the side of the cavity wall (4), even in the book to which microwaves are supplied, the second
Like the one in the figure, the support member (ul) only has a rotationally symmetrical effect on the optical path, so it is easy to design a cavity wall shape that provides uniform illuminance.

As described above, the present invention has a microwave cavity comprising a rotationally symmetrical cavity wall having a feeding port through which microwaves are introduced, and having at least one side open, and a metal mesh plate closing the opening. In a device comprising a shell and a spherical discharge lamp disposed within the cavity, the support member for supporting the discharge lamp is provided coaxially with the axis of rotational symmetry of the cavity wall, so that the support member Since the influence of the light on the optical path is small, and the influence is rotationally symmetrical, uniform illuminance can be easily obtained.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view showing the configuration of a conventional microwave discharge light source device, FIG. 2 is an enlarged cross-sectional view of the main part showing one embodiment of the present invention, and FIG. 3 is a diagram showing another embodiment of the present invention. FIG. 3 is an enlarged sectional view of the main parts shown. In the figure, (1) is the magnetron, C2) is the magnetron antenna, (3) is the waveguide, (4) is the cavity wall, and (5) is the magnetron antenna.
) is the power supply port, (6) is the discharge lamp, and (9) is the metal mesh plate. an, number a, (111) is a support member. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1 old

Claims (3)

[Claims] (1) A microwave cavity consisting of a rotationally symmetric nine body wall with an opening on at least one side and a feeding port through which microwaves are introduced, and a metal mesh plate that closes the opening, and this cavity. and a spherical discharge lamp disposed within the lamp. A microwave discharge light source device characterized in that a support member for supporting the discharge lamp is provided coaxially with an axis of rotational symmetry of the cavity wall. (2) The microwave discharge light source device according to claim 1, characterized in that the power supply port is provided on the rear surface of the cavity wall. (3) The microwave discharge light source device according to claim 1, which has a power feeding port on the side surface of the cavity wall.