JP3484571B2 - Neon lamp for display - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display neon lamp used as a light source of an instrument, an electric device, and the like, and more particularly, to a display neon lamp which emits light by glow discharge. The present invention relates to a display neon lamp having an improved shape, improved directivity, and stabilized luminance. 2. Description of the Related Art A conventional lamp of this type will be described with reference to FIG. In FIG. 4, a rare gas is sealed inside a sealed cylindrical glass bulb 1. Inside the cylindrical glass bulb 1, a pair of internal electrodes 6, 6 are sealed in a parallel arrangement with a predetermined distance, and are electrically connected to the internal electrodes 6, 6. The wires 7, 7 maintain a parallel relationship with each other, and pass through the other end face 3 of the glass bulb 1 in an airtight manner and are led out. The lamp of the above configuration is
For example, it is used as a load in a lighting circuit for displaying the charging voltage of the capacitor shown in FIG. Then, in order to make the light source by utilizing the light emission by the electrode glow, the internal electrode 6,
When a DC voltage is applied across the negative electrode 6, a negative glow is generated from the negative electrode side, and when irradiating light is obtained from the lamp axis direction, as shown by the arrow in FIG. Had a problem. Therefore, in order to improve the directivity, a light guide plate made of a material having a high reflection characteristic such as aluminum or silver is provided outside the glass bulb 1 to improve the directivity. Proposed. SUMMARY OF THE INVENTION In view of the above circumstances, the present invention controls the glow above the internal electrodes without using a light guide plate, thereby improving the directivity of the lamp and improving the luminance. It is an object of the present invention to provide a display neon lamp that can achieve stabilization. [0005] In order to achieve the above object, according to the first aspect of the present invention, there is provided a cylindrical glass bulb having a rare gas sealed therein. Electrodes
The lead-in wire connected to the internal electrode is hermetically led out from the other end face of the glass bulb to the outside, and the lead-in wire is fixedly supported at the other end face of the glass bulb. In order to concentrate the glow on the tip of the electrode during glow discharge,
The pair of internal electrodes has a protrusion protruding inward at a tip portion.
The cylindrical glass valley is formed in a standard
One end of the probe is either a concave lens or a convex lens.
A lens-shaped part formed in a lens shape . An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway perspective view of an example of an embodiment of the present invention. In this figure, a glass bulb 1 is formed in a cylindrical shape, one end face is formed in a transparent lens shape to form a lens-shaped portion 2, and the other end face 3 facing the lens-shaped portion 2 is formed in a flat surface. I have. This lens-shaped part 2 may be shaped as either a concave lens or a convex lens. The other end surface 3 of the glass bulb 1 facing the lens-shaped portion 2 is sealed with a flat glass plate to form a closed space inside the glass bulb 1. In the glass bulb 1, a mount composed of an internal electrode 4 and a lead wire 5 is sealed so as to be in a parallel positional relationship to each other. The internal electrodes 4 and 4 are formed in a standard shape having a protruding portion protruding inward at the distal end portions 41 and 41 so that the distal end portions are closer to other portions.
Is airtightly penetrated through the other end face 2 and is led to the outside, and is fixed and supported so as to maintain a parallel state in the glass bulb 1 by sealing with the other end face 3. In this embodiment, the distance between the tips 41, 41 of the internal electrodes 4, 4 is made smaller than the other parts of the internal electrodes 4, 4, so that the glow is applied to the tips of the electrodes 4, 4. As shown by arrows in FIG. 2, the directivity from the lamp axis direction is improved, and the one end surface of the glass bulb 1 is formed in a lens shape, thereby improving the luminance efficiency. Test Example 1 The luminance of the neon lamp for display in the present embodiment was measured and is shown as a graph in FIG. FIG.
Among them, the neon lamp for display in the present embodiment is indicated by A, and the brightness of the conventional display lamp shown in FIG. 4 is indicated by B for comparison. From this figure, it can be seen that the luminance efficiency of the display neon lamp in the present embodiment from the lamp axis direction is improved. As shown in Test Example 1, the luminance efficiency in the lamp axis direction is improved without using a light guide plate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view of an example of an embodiment of a display neon lamp. FIG. 2 is a diagram for explaining directivity. FIG. 3 is a diagram showing luminance from a direction of a lamp axis. FIG. 4 is a partially cutaway explanatory view showing a display lamp of a conventional example. FIG. 5 is an explanatory diagram showing an example of use of a display lamp. [Explanation of Signs] 1 Glass bulb 2 Lens-shaped portion 3 Other end surface 4 Internal electrode 41 Tip 5 Introduction wire

Claims (1)

(57) [Claim 1] A pair of internal electrodes are arranged in parallel and sealed in a cylindrical glass bulb in which a rare gas is sealed, and connected to the internal electrodes. In the display neon lamp, the introduced lead line is hermetically led out from the other end face of the glass bulb to the outside, and the lead wire is fixedly supported at the other end face of the glass bulb. The pair of internal electrodes protrude inward at the tip to concentrate the
One end face of the cylindrical glass bulb is formed in a normal view having a protruding portion, and one end surface of the cylindrical glass bulb is
A lens-like part formed in one of the lenses of the lens;
A neon lamp for display characterized by that.