JPS60138838A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To bring no flickering at ends and maintain uniform brightness distribution over a long period of time by arranging electrode compartments comprising nontransparent material base body at both ends of a glass tube, sealing an electrode stem to each of the base bodies, and installing the electrode in the electrode compartment. CONSTITUTION:A base body 3 opens its both ends, and its one end is sealed in airtightness with the open end of a glass tube and a glass frit 5, and the other end is closed with a glass stem 7 in which an electrode 6 is installed and sealed in airtightness with a glass frit 5. Since the electrode 6 is arranged in an electrode compartment 4 formed with a ceramic base body 3, even if flickering occurs in the vicinity of the electrode 6 during lighting, flickering is shielded by the ceramic base body 3 to prevent the effect to the outside. Barium and others scattered from an electron radiation substance separated on the electrode 6 during long time lighting adhere on the inner wall of the electrode compartment 4. Light emitting distribution in a glass tube 1 becomes uniform and no deterioration of brightness at the end of the glass tube 1 occurs even in lighting for a long time.

Description

[Detailed description of the invention] [Technical field of invention] This invention relates to an improved fluorescent lamp.

[Prior art]

In general, a fluorescent lamp has a structure in which a glass stem with a single pole of frost is sealed on both ends of a glass tube with a fluorescent material t=W formed on the inside, and a small amount of mercury and diluted gas are completely sealed inside. ing. When a fluorescent lamp having such a structure is turned on, a flicker phenomenon peculiar to a discharge lamp occurs near the electrodes at both ends of the lamp, and the light emission intensity at this portion becomes unstable. Also, if the light is on for a long time.

Painted on the electrode. '...Barium or the like scatters from the heptaton emitting material and adheres to the inner surface of the end of the glass tube, which has the disadvantage that the emission intensity of this portion decreases. These drawbacks do not pose a practical problem when used as a source for ordinary general illumination, but when used as a source for general illumination, it is strongly required that the intensity distribution of the two sources be uniform.
For example, a light source for a copy machine or a nice play)′
When trying to use it as an e-source, the above-mentioned drawbacks, namely the flicker phenomenon at the edges and the localized decrease in luminous intensity at the edges, become major obstacles.

[Summary of the invention]

This invention has been made in view of the above points, and the overall purpose of this invention is to provide a fluorescent lamp that does not cause flickering at the end and maintains a uniform luminous intensity distribution even when the lamp is turned on for a long time. An electrode chamber made of a base made of an opaque material is placed at both ends of the glass tube.

The present invention is characterized in that the electrode stem is sealed to the base body, and the electrode is disposed within the electrode chamber.

[Embodiments of the invention]

The embodiment of the invention of C will be explained below with reference to all drawings.

FIG. 1 shows an embodiment of the fluorescent lamp of the present invention, in which (1) is a glass tube with a phosphor layer (21) formed on its inner surface and is open at both ends; (3) is a cylindrical tube; The base body (3) of C is open at both ends, and one end is hermetically sealed to the open end of the glass tube by a glass frit (5).

The other open end is a crow stem (7) in which an electrode (6) is implanted.
), and is also sealed more airtight than the glass frit (5)K. (4) is an electrode chamber covered with the base (3). (81 is an exhaust pipe for evacuating the inside and filling the entire tank with diluted scum in mercury.

In a fluorescent lamp having such a structure, the electrode (7) is disposed within the electrode chamber (41) formed by the ceramic base (3). Even if a flickering phenomenon occurs near the ceramic base (3)
) Since the light is shielded by the VC, there is no possibility of influencing the outside world, and even if the light is turned on for a long time and barium etc. scatters from the electron emitting material coated on the fh electrode (7), the electrode chamber (
4) Since it sticks to the inner wall of 9, the glass tube fl which is the light emitting part
i has a uniform emission intensity distribution in the axial direction, and has the advantage that the emission intensity does not decrease at the end even if it is turned on for a long time. Therefore, it is suitable for light sources for copying machines, etc., which require a uniform emission intensity distribution.

FIG. 2 shows another embodiment of the invention.

(1) is a U-shaped glass tube with a phosphor layer (2+) on the inner surface and is open at both ends; (3) is a ceramic base; One opening of each hole is hermetically sealed with both open ends of the U-shaped glass tube fli by a glass frit (5), and the other openings are each sealed with a glass frit (5). It is closed with a glass stem in which the pole (6) is implanted, and it is also sealed more airtight than the glass frit (51K).

A fluorescent lamp with such a structure is suitable for use in fields where miniaturization of the C source is required, and i! In addition to the feature that there is no flicker in the vicinity, both ends of the glass tube (1) are fixed to one base (3), so the glass tube (li) is less likely to be damaged when external force is applied during handling. There is also an advantage.

9 In the above examples, the base body is made of ceramic, but it may be made of a non-transparent material that has a thermal expansion coefficient similar to that of the glass tube and has good contact with the glass frit. It's functionally unusable.

Further, in the above embodiment, a glass stem is used as the closure body having 41r1 electrodes, but a flat plate stem having a structure such as a ceramic plate with electrodes embedded therein may be used. However, from the viewpoint of reliability of the electrode lead wire implantation part, etc., the crow stem used in the secondary key stirrup σ) is most suitable.

〔Effect of the invention〕

As described above, the fluorescent lamp of the present invention is.

A glass tube 9 with both ends open and one opening sealed to the end of the glass tube, and an electrode chamber formed inside communicating with the inside of the glass tube. It has a structure in which the opening of the sac 1, which does not contain the crow's canal, is completely airtightly closed, and an electrode located inside the electrode chamber is implanted, so that one closing body is provided.

The flicker phenomenon peculiar to discharge lamps that occurs near one pole of frost has no effect on the outside as the light bounces around the base, and the yC degree at the end may also decrease due to materials scattered from the electrodes. Therefore, it is effective as a light source that requires a uniform emission intensity distribution. Moreover, since it has a simple structure consisting of a crow tube, a base, and a closed body crow frit, it is not particularly difficult to manufacture.

[Brief explanation of the drawing]

Figure 71 is a partially sectional view showing one embodiment of the present invention. FIG. 2 is a partial cross-sectional view showing all other embodiments of the present invention. In the figure, (1) is a glass tube, and (3) is a substrate. Note that the same reference numerals in each figure indicate the same or A considerable portion is shown. Agent Masuo Oiwa

Claims (3)

[Claims] (1) Glass tube with both ends open 1 Made of an impermeable round body with both ends open and one opening sealed to the end of the glass tube, with the electrode pentode chamber formed inside communicating with the inside of the glass tube. A fluorescent lamp characterized in that the opening of the substrate on the side where the glass tube is not sealed is completely airtightly closed, and the electrodes located in the electrode chamber are entirely implanted in the closed body. (2) The fluorescent lamp according to claim 1, wherein both ends of the glass tube are sealed to one base. (3) The fluorescent lamp according to claim 1, wherein the closing body has a crow stem closure.