JPS58223252A - Light source lamp - Google Patents

Abstract

PURPOSE:To reduce the amount of a quartz plate used, and simplify the manufacture of a light source lamp by forming a transparent discharge window provided at the end of the tube axis of a glass case, in which an emission source having a hollow cathode is installed, by fixing the quartz plate to the opening of the glass case by means of an adhesive. CONSTITUTION:An emission source consisting of a hollow cathode 3 and an anode 5 is installed in a case 1 made of borosilicate glass, and the case 1 is charged with a rare gas at several Torrs. At the same time, an opening 11a is perforated in the center of a flat front wall 1, and a quartz plate 2 is fixed to the wall 11 from outside the opening 11a so as to make a transparent discharge window, thereby making a hollow cathode lamp. In fixing the quartz plate 2, a thermosetting epoxy resin is used as an adhesive, and gas contained in the adhesive is completely expelled after the fixation so as to enable a light source lamp to be assembled airtight. By the means mentioned above, the amout of the expensive quartz plate 2 can be reduced, manufacture of the lamp can be extremely simplified, and its cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) The present invention has a light emitting source inside a bottomed cylindrical glass tube found in hollow cathode lamps, etc., and emits light from a transparent exit window provided at a position approximately perpendicular to the tube axis. The present invention relates to a lamp for a light source that emits light.

Borrow cathode lamps are well known as light sources that provide ultraviolet light and the like.

Inside the cylindrical tube of a hollow cathode lamp, a cylindrical cathode (hollow cathode) with one end open and a rod-shaped or cylindrical anode (anode) are provided.
It is filled with rare gas.

When a voltage of several hundred pol I is applied between the hollow cathode and the anode, light emission peculiar to the substance constituting the hollow cathode occurs.

By passing the light emitted from the hollow cathode through a gas to be measured and measuring absorption by the gas to be measured,
It is possible to know whether or not the same substance as the material of the hollow cathode is contained in the gas to be measured, and if so, its presence or absence or the amount thereof.

FIG. 1 is a diagram (2) showing an example of a conventional hollow cathode lamp. To the exit surface of a borrowed cathode lamp,
A quartz plate is used that transmits ultraviolet rays well. Because the quartz plate is expensive and it is difficult to bond the quartz plate directly to the bottom of the glass cylinder, the exit side of the glass tube body C is narrowed and the glass tube is connected to the quartz plate as shown in Figure 1. Between the main body C, glass having characteristics intermediate between those of quartz and glass tube materials is used, and a stepped joint is made at the part B. The shape of the one-cathode lamp shown in FIG. 1 is advantageous in that it does not use more quartz plates than necessary.

However, the step joining requires skill, and the J-strain of the work increases. In addition, when supporting a hollow cathode lamp toward the object to be measured, the diameter of the base of the tube is different from the diameter of the front, and the support structure becomes complicated because these parts may not necessarily be concentric. There are other problems.

An object of the present invention is to provide a light source lamp that solves the above problems.

In order to achieve the above object, a light source lamp according to the present invention has a light emitting source in a cylindrical glass container (3) and generates light from a transparent exit window on the - side in the tube axis direction. In this lamp, an opening having a diameter smaller than the diameter of the glass body provided on the transparent injection wall side of the glass tube body, and an opening having a diameter smaller than the diameter of the glass tube body airtightly joined to the opening by adhesive. A quartz plate having a small diameter is also provided, and the light from the light emitting source is emitted from the exit window formed by the quartz plate.

According to the above configuration, the object of the present invention can be completely achieved.

The present invention will be described in further detail below with reference to the drawings and the like. FIG. 2 is a partially cutaway side view of a borrow cathode lamp which is an embodiment of the light source lamp according to the present invention, and FIG. 2 is a front view.

The glass tube body 1 is made of borosilicate glass called Kovar glass.

The front surface 11 of this glass tube body is planar, and a circular opening 11a is bored in the center thereof.

The disc-shaped quartz plate 2 is the opening] 1. greater i than a
¥, and is attached to the front from the outside and is transparent (4
) Na! It forms 11 bay windows. Before bonding the quartz Fj, 2 to the front surface 11 of the glass tube body, the bonding surface is polished. The quartz plate 2 is bonded to the front surface 11 using a thermosetting epoxy resin adhesive. After bonding, the gas contained in the epoxy resin (1) used for bonding is completely expelled, and then the hollow cathode lamp is made into silk.The central axis of the cylindrical hollow cathode 3 supported within the glass tube body 1 at 61 points aligned with the central axis;
It is connected to a hollow cathode pin 6 fixed to the base 7. A cavity 3a is provided on one side of the exit window of the quartz plate 2 of the hollow cathode 3.

An annular anode 4 is supported in front of the hollow cathode 3 on the central axis of the hollow cathode 3, and a base 7
The anode pin 5 is fixed to the anode pin 5.

The borrow cathode lamp having the above structure has an anode 5 and a hole 1.
: When a voltage of about 400 volts is applied between I and cathode pin 6, discharge starts, and then the anode.

The voltage across the cathode drops to approximately 250 volts (5) and discharge continues. The discharge is accompanied by light emission in the cavity 3a. This light emission occurs when electrons emitted from the cathode collide with and excite the filled gas.

The enclosed gas ions generated at this time are photo 1 - cathode 3.
A gas of the substance forming the cathode is generated by sprinkling the inner wall of the cavity 3a. The gas of the material forming this cathode also emits light due to the collision of electrons, similar to the above-mentioned sealed gas. In this way, for this emission, the borrow cathode 3
includes a bright line spectrum specific to the material forming the quartz plate 2, and is projected forward from the transparent exit window formed by the quartz plate 2.

The lamp for a light source according to the present invention is constructed as described below, and therefore has the following effects.

First, by bonding the quartz plate 2 to the front surface 11 of the glass tube body I with an adhesive, a transparent exit window can be formed. Therefore, unlike the conventional method, there is no need for the difficult work of joining different types of glass by thermal welding. Since the adhesion work does not require skill and is less likely to produce defective products, manufacturing efficiency can be significantly reduced.

(6) As mentioned above, if the gas contained in the adhesive is released in advance, no problems will occur.Durability tests have shown that the airtightness, etc., is completely different from the 17C device. L
It was confirmed that there were no problems.

Next, since the opening in the front face 11 can be minimized, the amount of quartz used can be equal to or less than that of the conventional case. Secondly, since the outer diameter of the glass tube body can be made uniform without deforming it, even if the lamp support structure is simplified, it is possible to accurately point it at the object to be measured, and it is also easy to fine-tune the optical axis. It is.

Although the embodiment of the boron cathode lamp has been described in detail above, the present invention is a point I:J cathode lamp, which has a light source inside the lamp rather than the IJ and emits light from a transparent exit window made of quartz. It can be applied to lamps.

[Brief explanation of drawings]

FIG. 1 is a side view showing an example of a conventional borrow cathode lamp, with the vicinity of the exit window partially cut away. FIG. 2 is a side view showing an example of the light source lamp according to the present invention, showing the inside Part 141i is partially broken to show the structure (this is an illustration). Fig. 3 is a top view of the light source lamp. 1...Glass tube body 2...Quartz plate 3...Borrow cathode 4 ...Anode 5...Anode 1' pin 5 6...Borrow cathode pin 7...Base 11...Glass tube main body front surface 11a...Opening provided on the glass tube main body front surface Patent application People Hamamatsu Television Co., Ltd.

Claims (1)

[Claims] (+1 A light emitting source is provided in a cylindrical glass container with a bottom,
In a lamp for a light source that emits light from one transparent exit window in the tube axis direction, an opening with a diameter smaller than the diameter of the glass tube body provided on the transparent exit wall side of the glass tube body, and the opening and a quartz plate having a diameter smaller than the diameter of the glass tube main body, which is airtightly joined with an adhesive, and the light from the light emitting source is configured to be emitted from the exit window formed by the quartz plate. A light source lamp characterized by: (2) the cathode of the light emitting source is a hollow cathode;
The light source lamp according to claim 1, wherein the tube is filled with a rare gas. (3) The light source lamp according to claim 1, wherein the opening having a diameter smaller than the diameter of the glass tube body is a mouth opening formed in the exit side surface of the glass tube body.