JPS6231862Y2 - - Google Patents

Description

[Detailed description of the invention] A spectrometer of an optical measuring device may require a broadband light source ranging from infrared rays to ultraviolet rays.

For this reason, conventionally, as shown in Fig. 1, a quartz window 2
In order to form a point light source by enclosing deuterium gas in an airtight outer tube 1 having a deuterium gas, and narrowing a part of the discharge path of the glow discharge with a cathode 4 and an anode 5 for generating the deuterium glow discharge. aperture 8 and filament 10 in another glass airtight container 1
1 is housed in the airtight outer tube 1, and a hole 7 is provided in the anode 5, and the quartz window 2, the aperture 8, the anode 5, and the filament 10 are arranged.
By arranging these in a straight line in this order, a composite lamp was used that could produce a wide range of light from ultraviolet to infrared light on the same axis.

However, in the above-mentioned composite lamp, the anode 5 is bombarded with electrons, and the sputtered anode material adheres to the glass airtight container 11 of the incandescent lamp 6, blackening the container wall, so the deuterium gas discharge is reduced to 100%.
After a period of time, it blocks approximately 60 percent of the light emitted by incandescent lamps. The lifespan of such composite lamps is therefore extremely short. Furthermore, the blackened container wall described above absorbs the heat generated by the filament 10 and becomes high in temperature. In addition, the diameter of the aperture 8 is made large in order to allow the light emitted from the filament 10 to pass through sufficiently.
There is a drawback that the positive column cannot be sufficiently contracted and high-intensity light emission cannot be obtained.

The present invention relates to a composite lamp which eliminates the above-mentioned drawbacks.

FIG. 2 is a diagram showing the longitudinal cross-sectional structure of the composite lamp of the present invention. In FIG. 2, 21 is an airtight outer tube, 22 is a quartz window provided in a part of the airtight outer tube 21,
23 is an electrostatic shielding box made of metal, 24 is a hot cathode,
25 is an anode, 26 is an incandescent lamp having a filament 30 sealed in a glass airtight container 31, and 28 is an aperture provided in the electrostatic shielding box 23, which is provided at the apex of a partition wall protruding toward the cathode side. 32 is a metal mesh provided in the electrostatic shielding box 23. Second
The composite lamp shown in the figure has a hermetic outer tube 2 with a quartz window 22.
In this order, a cathode 24 for enclosing deuterium gas in a tube 1 and generating a glow discharge of deuterium, an aperture 28 for forming a point light source by constricting a part of the glow discharge, and an anode 25 are installed in this order. The quartz window 22, the discharge path, and the incandescent lamp 26 are arranged in this order in a straight line orthogonal to the arrangement at the discharge path, and are arranged in the airtight outer tube 21. A conductive mesh 32 is provided between the lamps 26, and the mesh 32 is used as a cathode.
The anode and the incandescent lamp 26 are fixed to a shielding box 23 that surrounds them.

Here, the discharge path is formed on a straight line between the cathode 24 and the anode 25, and is spaced sufficiently apart from the incandescent lamp 26. Furthermore, the electrons are at the anode 2
Even if 5 is bombarded, the spattered substance is
It is blocked by the shielding box 23 and does not reach the incandescent lamp 26. Furthermore, the area around the aperture 28 may be partially spattered, or the anode 25 may be partially spattered.
Even if the sputtered substance moves backward through the aperture 28, it will not reach the incandescent lamp 26 because it will be blocked by the mesh 32.

In the above composite lamp of the present invention, the cathode 24
After passing a direct current between the anode 25 and the anode 25 and sustaining deuterium discharge for 100 hours, the light emission of the incandescent lamp will be approximately 70
Attenuated by %. In other words, it blocks only about 30% of the light.

As described above, according to the present invention, it is possible to obtain a composite lamp with extremely low attenuation compared to conventional lamps.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional structural diagram of a conventional composite lamp, and FIG. 2 is a vertical cross-sectional structural diagram of a composite lamp of the present invention.

Claims (1)

[Scope of utility model registration request] Deuterium gas is sealed in an airtight outer tube 21 having a quartz window 22, and a cathode 24 for generating a glow discharge of deuterium and an aperture for narrowing a part of the glow discharge to form a point light source. 28 and the anode are arranged in this order on a straight line, and the quartz window 22, the discharge path, and the incandescent lamp 26 are arranged in this order on a straight line perpendicular to the above arrangement at the discharge path, and are arranged in the airtight tube 21. Furthermore, a conductive mesh 32 is provided between the discharge path and the incandescent lamp 26, and the mesh 32 is connected to the cathode 24, anode 25,
A composite lamp fixed in a shielding box 23 surrounding each incandescent lamp 26.