JP3149077B2 - Fluorescent lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp, and more particularly, to an electrode in which an electron-emitting portion from which electrons are emitted and a supporting portion for supporting the electron-emitting portion are arranged near the end of the fluorescent lamp. The present invention relates to a fluorescent lamp.

[0002]

2. Description of the Related Art Fluorescent lamps are classified into a cold cathode type and a hot cathode type depending on the type of electrode, and a hot cathode type fluorescent lamp is widely used for general lighting because the discharge starting voltage can be lowered. .

The configuration of this hot cathode fluorescent lamp is, for example,
For example, see “4.3.7 Fluorescent lamps” p.
4, Handbook of optical technology, edited by Hiroshi Kubota, Asakura Shoten
Issuance). This structure will be described with reference to FIG. 4. A fluorescent material 10 is applied to the inner wall of the cylindrical glass tube 6, and an electron emitting portion 1 and a supporting portion 2 supporting the electron emitting portion 1 are provided near the end of the fluorescent lamp. ing. The electron emission section 1 is formed of a coil filament coated with an oxide of an alkaline earth metal or the like to facilitate emission of thermoelectrons. Electrons 11 are emitted from the electron emitting section 1, discharge is caused in the mercury vapor by the emitted electrons to excite or ionize mercury atoms 12, and the emitted ultraviolet 13 excites the phosphor 10 to emit light. Has become. 8 is a base and 9 is a terminal.

As another structure of the fluorescent lamp,
There is a fluorescent lamp proposed by the present inventors as shown in FIG. 5 (Japanese Utility Model Laid-Open No. 6-84671). In this fluorescent lamp, the base 8 of the fluorescent lamp is provided not on the end face side but on the side face side of the fluorescent lamp. In addition, the lighting can be performed while maintaining the continuity of the lighting.

[0005]

However, since the fluorescent lamp discharges between the electrodes and emits light mainly by ultraviolet rays emitted in the discharge space, the fluorescent lamp emits light of sufficient luminance at the end portion thereof. There are issues that cannot be obtained.

Particularly, the fluorescent lamp shown in FIG. 5 does not cover the end face side with a base, and also tries to contribute to the illumination of the end of the fluorescent lamp. The purpose of performing illumination while maintaining continuity cannot be sufficiently achieved.

[0007]

According to the first fluorescent lamp of the present invention, the outside of the lead portion of the electrode is taken out of the fluorescent lamp side.
In the fluorescent lamp, which is performed from the surface side, the electrode, an electron emission portion from which electrons are emitted, and a support portion supporting the electron emission portion are arranged near the end of the fluorescent lamp. The support unit is provided such that the electron emission unit is provided with the fluorescent lamp.
The support on the central axis of the pump and in front of the electron-emitting portion
The electron emission section is bent toward the end of the fluorescent lamp so that the section is located , and the electron emission section is brought closer to the end.

[0008] The second fluorescent lamp of the present invention comprises an electrode
Of the fluorescent lamp from the side of the fluorescent lamp
Together are cracking, of the electrode, and a support portion which electrons supporting the electron emitting portion electron emitting portion is released, the fluorescent lamp comprising is disposed in the vicinity of the end of the fluorescent lamp, before
The electron emission portion is located on a central axis of the fluorescent lamp.
Thus, a support member is provided for bringing the electron emission section closer to the end.

[0009]

In the third fluorescent lamp of the present invention, the lead of the electrode is taken out from the side of the fluorescent lamp, and the electron emission portion of the electrode from which electrons are emitted and the electron emission portion. a support for supporting a discharge portion, the electronic
In which discharge portion is sealed so as to be inclined on the end side of the located on the central axis of the fluorescent lamp and the <br/> fluorescent lamps the fluorescent lamp from the longitudinal and perpendicular direction.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) In this embodiment, an electron emission portion is brought closer to an end portion of a fluorescent lamp by bending a support portion of an electrode. FIG. 1A is a schematic perspective view of an electrode part showing a first embodiment of the fluorescent lamp of the present invention.
FIG. 1B is a schematic perspective view showing a state before bending of a supporting portion of the electrode. FIG. 1C is a sectional view of an end portion of a fluorescent lamp using the electrode of FIG. 1A.

1 (a) to 1 (c), reference numeral 1 denotes an electron emitting portion made of a coil filament coated with an oxide of an alkaline earth metal or the like for facilitating emission of thermoelectrons.
Reference numeral 2 denotes a supporting portion that supports the electron emitting portion, and 3 denotes a lead portion. Reference numeral 4 denotes a glass portion sealed on the side surface of the glass tube 6, an exhaust port is provided at an upper portion, and the inside of the glass tube 6 is exhausted by the exhaust tube 5.

In this embodiment, the support section 2 is bent from the state shown in FIG. 1B as shown in FIG. 1A, and the electron emission section 1 is connected to the end of the glass tube 6 as shown in FIG. It is closer to the side. Since the configuration is the same as that of the conventional fluorescent lamp except for bending the supporting portion, the manufacturing process is not complicated at all. By doing so, the brightness at the end of the glass tube 6 could be improved.

Although it is not always clear why the brightness at the end portion is increased by bringing the electron emission portion closer to the end portion of the fluorescent lamp, it can be understood as follows.

In a fluorescent lamp, when a voltage is applied between opposing electrodes, the electrons emitted from the electron-emitting portion are accelerated to a degree sufficient to excite or ionize the mercury atoms, and collide with the mercury atoms. Kinetic energy is given to the mercury atom. Then, the mercury atoms are excited or ionized, and the ultraviolet rays are emitted by the excitation or recombination, and the phosphor in the tube wall emits light.

Therefore, the space at a certain distance until the electrons are sufficiently accelerated from the electron emitting portion and the space on the fluorescent lamp end side opposite to the direction in which the electrons are accelerated are sufficiently excited or recombined. It is considered that the brightness is low because the ultraviolet light does not easily reach and the brightness is low. In the present invention, since the electron emitting portion is closer to the fluorescent lamp end, the discharge space is closer to the fluorescent lamp end, and the region where ultraviolet rays are emitted is closer to the fluorescent lamp end. It is considered that the brightness increased.

Hereinafter, specific experimental examples of the embodiment of the present invention will be described.

As shown in FIG. 6, the center of the base is located at a position 12 mm from the end face of the fluorescent lamp having a diameter of 20 mm, and is located at a position (A in the figure) on the end side of the fluorescent lamp about 7 mm from this center position. The fluorescent lamp (sample A) was manufactured by bending the supporting part so that the electron emitting part came. For comparison, the fluorescent lamp (sample B) was positioned so that the electron-emitting portion was located at the center of the base (B in the figure), and about 7 mm from the center of the base in the direction opposite to the end (in the figure). The supporting portion was bent in the opposite direction so that the electron-emitting portion came to C) to produce a fluorescent lamp (sample C). In addition, the electron emission part of each sample was located substantially on the center axis of the glass tube.

Then, 5 mm from the end face of the fluorescent lamp, respectively.
The brightness of each sample was measured at room temperature of 25 ° C. at mm (point a), 10 mm (point b), and 15 mm (point c). As the luminance meter, TOPCON-BM-7 was used. The result is shown in FIG. As is clear from FIG. 7, the brightness at the brightness measurement points (a, b, c) of each sample is in the relationship of sample A> sample B> sample C, and the electron emission portion should be closer to the end of the fluorescent lamp. It was found that the luminance increased further.

When the life test of the fluorescent lamp of the present embodiment was performed, the fluorescent lamp of Sample A was compared with those of Samples B and C.
It was found that in the fluorescent lamp of No. 1, the blackening of the tube end due to the sputtering was reduced. The cause of this is not always clear, but is understood as follows.

Normally, the potential of the cathode drops greatly near the cathode,
The ionized atoms are rapidly accelerated and collide with the cathode. At the time of this collision, the metal atoms of the cathode fly out and blacken the tube end. In the fluorescent lamp of the present embodiment, a support is disposed in front of the electron-emitting portion, the electric field for accelerating the ionized atoms is weakened by the support, and the kinetic energy of the ionized atoms colliding with the electron-emitting portion is small. As a result, it is considered that electrode wear is suppressed and blackening of the tube end due to sputtering is reduced.

(Embodiment 2) In the present embodiment, the electron-emitting portion itself is brought closer to the end of the fluorescent lamp while the electrode support is kept as it is. In the present embodiment, as shown in FIG. 2, a support member 7 for supporting the electron emitting portion 1 in order to bring the electron emitting portion 1 closer to the end of the fluorescent lamp is provided.

(Embodiment 3) In this embodiment, when sealing an electrode without changing the shape of the electrode, as shown in FIG. 3, the sealing is performed by inclining at a predetermined angle from a direction perpendicular to the length direction of the fluorescent lamp. In this case, the electron emission portion is brought closer to the end of the fluorescent lamp.

In each of the embodiments described above, as shown in FIG. 5, the lead-out portion of the electrode is taken out from the side of the fluorescent lamp, as shown in FIG. The present invention can be applied to a conventional fluorescent lamp. In this case, the support portion may be bent as in the first embodiment, or a support member may be provided as in the second embodiment, and the electron emission portion may be brought closer to the end portion of the fluorescent lamp.

Although the above-described embodiment is directed to a hot cathode fluorescent lamp, the present invention can, of course, be applied to a cold cathode fluorescent lamp. In addition, when an abnormal discharge occurs in the support portion by disposing the electron emission portion after the support portion, the support portion may be covered with an insulating material.

Since the fluorescent lamp according to the present invention can reduce the difference in luminance between the center and the end, it can be used for the connectable fluorescent lamp shown in FIG. 5 and a transmissive display such as a liquid crystal display. Can be suitably used as a backlight or the like.

[0028]

As described above, according to the present invention,
The brightness at the end of the fluorescent lamp can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing a first embodiment of a fluorescent lamp of the present invention.

FIG. 2 is a schematic perspective view showing a second embodiment of the fluorescent lamp of the present invention.

FIG. 3 is a schematic sectional view showing a third embodiment of the fluorescent lamp of the present invention.

FIG. 4 is a schematic explanatory view showing a configuration of a conventional fluorescent lamp.

FIG. 5 is a schematic explanatory view showing another configuration of a conventional fluorescent lamp.

FIG. 6 is a schematic explanatory view showing a configuration of a fluorescent lamp of an experimental example of the present invention.

FIG. 7 is a characteristic diagram showing luminance characteristics of the fluorescent lamp of the experimental example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electron emission part 2 Support part 3 Lead part 4 Glass part 5 Exhaust pipe 6 Glass tube

Claims (3)

(57) [Claims] 1. The method according to claim 1, wherein the lead out of the electrode is taken out of the fluorescent lamp
In the fluorescent lamp, which is performed from the side of the lamp, the electrode has an electron emission portion from which electrons are emitted and a supporting portion for supporting the electron emission portion arranged near the end of the fluorescent lamp. The support portion is provided such that the electron emission portion is located at the center of the fluorescent lamp.
The support part is located on the axis and in front of the electron emission part.
The fluorescent lamp is bent toward the end of the fluorescent lamp so that the electron-emitting portion is closer to the end. 2. The method according to claim 1, wherein the lead out of the electrode is taken out of the fluorescent
In the fluorescent lamp, which is performed from the side of the lamp, the electrode has an electron emission portion from which electrons are emitted and a supporting portion for supporting the electron emission portion arranged near the end of the fluorescent lamp. The electron emission portion is located on the central axis of the fluorescent lamp.
A fluorescent lamp provided with a support member for bringing the electron-emitting portion closer to the end portion. 3. The method according to claim 1, wherein the lead portion of the electrode is taken out from the side of the fluorescent lamp, and an electron emitting portion of the electrode from which electrons are emitted and a supporting portion for supporting the electron emitting portion are provided. The electron emission portion is located at the center axis of the fluorescent lamp.
Position is and the fluorescent lamp in the longitudinal direction perpendicular to the a direction fluorescent lamps fluorescent lamps are sealed to tilt on the end side of the upper.