JP2008059896A - Fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably support an electron emitting electrode in a fluorescent lamp which has the electron emitting electrode of a straight line shape extending in a longitudinal direction of a fluorescent tube in the fluorescent tube in which a transparent conductor layer is formed on an inner face of a transparent cylindrical part and a phosphor layer is formed on the inner face of the conductor layer, and which emits light by exciting the phosphor by emitting electrons to the conductor layer from this electron emitting electrode. <P>SOLUTION: The fluorescent lamp 1 is provided with an electron emitting electrode 14 of straight line shape extending in the longitudinal direction of a fluorescent tube 10 in the fluorescent tube 10 in which a transparent conductor layer 10b is formed on an inner face of a glass tube 10a and a phosphor layer 10c is formed on the inner face of this conductor layer 10b. A lead wire 15 is fixed and supported to a stem 13 in welded form at a base part of the electron emitting electrode 14 and electrically neutral lead wires 21 are embedded as a plurality of pieces in ring shape in the tip part of a stem 11, and by these plurality of lead wires 21, the tip part of the electrode emitting electrode 14 is surrounded, and thereby movement of the electron emitting electrode 14 is regulated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention provides a linear electron emission extending in the longitudinal direction of a fluorescent tube in a fluorescent tube in which a transparent conductive layer is formed on the inner surface of the transparent cylindrical portion and the fluorescent layer is formed on the inner surface of the conductive layer. In particular, the present invention relates to holding of an electron emission electrode in a fluorescent lamp that includes an electrode and excites a phosphor by emitting electrons from the electron emission electrode toward a conductor layer to emit light.

Conventional fluorescent lamps generate ultraviolet rays from mercury vapor sealed in a fluorescent tube and excite the phosphors with the ultraviolet rays to emit light. However, as a new fluorescent lamp that does not use mercury, phosphors are converted into electrons. A type that emits light by direct excitation has been proposed. (For example, see Patent Document 1)
When such an electronic excitation type fluorescent lamp is to be realized with a simpler configuration, a transparent conductor layer is formed on the inner surface of the transparent cylindrical portion, and a phosphor layer is formed on the inner surface of the conductor layer. In the fluorescent tube, a linear electron emission electrode extending in the longitudinal direction of the fluorescent tube is disposed substantially along the central axis of the fluorescent tube, and a voltage is applied between the conductor layer of the fluorescent tube and the electron emission electrode. Thus, a fluorescent lamp that emits electrons from the electron emission electrode toward the conductor layer to excite the phosphor and thereby emit light can be considered.

As an example of the structure of this new type of fluorescent lamp, both ends of a cylindrical fluorescent tube are sealed with stems, and one stem is connected to an electrode terminal for connection to the cathode of a power source, and an electron emission connected to the electrode terminal. The other stem has a structure including an electrode terminal for connecting to the anode of the power source and a lead wire for connecting the electrode terminal to the conductor layer in the fluorescent tube.
JP 2002-42735 A

 When manufacturing the fluorescent lamp, stems are inserted from both ends of the cylindrical fluorescent tube and sealed. In this case, if the electron emission electrode is fixed to both stems, the stem cannot be inserted into the fluorescent tube. Therefore, only one end (base end) of the electron emission electrode is fixed to one stem and the other end ( The tip is not fixed and held in any way.

 In the above fluorescent lamp, the length of the electron emission electrode is a substantially effective issuance length. Therefore, when trying to make a long fluorescent lamp, the electron emission electrode becomes inevitably longer. Since it is held only at the base end, if the electron emission electrode becomes longer, the electron emission electrode is likely to be displaced from the central axis of the fluorescent tube due to vibration or deflection, thereby causing variations in the distance from the electron emission electrode in the fluorescent tube, There is a problem that luminance unevenness occurs in the fluorescent lamp.

 If the electron emission electrode further moves, there is a possibility that the electron emission electrode and the conductor layer of the fluorescent tube are in direct contact and short-circuited.

  The present invention has been made in view of the above problems, and a fluorescent tube is formed in a fluorescent tube in which a transparent conductor layer is formed on the inner surface of a transparent cylindrical portion, and a phosphor layer is formed on the inner surface of the conductor layer. In a fluorescent lamp having a linear electron emission electrode extending in the longitudinal direction of the phosphor, and exciting the phosphor by emitting electrons from the electron emission electrode toward the conductor layer, thereby emitting light stably. It is an object of the present invention to provide a fluorescent lamp that can be held.

  The fluorescent lamp according to the present invention includes a fluorescent tube in which a transparent conductor layer is formed on the inner surface of a transparent cylindrical portion, a phosphor layer formed on the inner surface of the conductor layer, and a fluorescent tube disposed inside the fluorescent tube. It consists of a linear electron emission electrode extending in the longitudinal direction of the tube and a stem that is fixed to one end of the fluorescent tube and holds the base end of the electron emission electrode. The fluorescent lamp in which the electrode is connected to the cathode is characterized by comprising holding means for holding a portion other than the base end of the electron emission electrode and restricting the movement of the electron emission electrode.

  Here, “holding the part other than the base end of the electron emission electrode to regulate the movement of the electron emission electrode” means that the movement of the electron emission electrode is completely regulated by holding a part of the electron emission electrode in contact with each other. The term “electron emission electrode” and “electron emission electrode” generally refer to those arranged around the electron emission electrode in a non-contact state and restricting movement of the electron emission electrode by a predetermined amount or more.

  Further, “to restrict the movement of the electron emission electrode” means to restrict the movement to the extent that the electron emission electrode and the conductor layer in the fluorescent tube do not contact each other. Of course, it is preferable that the electron emission electrode does not move as much as possible from a predetermined position (usually a position along the central axis of the fluorescent tube).

  The holding means may be a cylindrical body for inserting the tip of the electron emission electrode held at the other end of the fluorescent tube.

  When the fluorescent tube has a fitting portion that protrudes from the outside to the inside of the fluorescent tube at the other end, the holding means is fixed to the tip of the electron emission electrode, and the fitting portion It is good also as a fitting member fitted by.

  Further, the holding means may be a holding member that is disposed in the fluorescent tube and has an insertion portion for inserting the electron emission electrode at a substantially center, or a protruding portion that protrudes inward from the outside of the fluorescent tube. It is good.

  According to the fluorescent lamp of the present invention, a transparent conductor layer is formed on the inner surface of the transparent cylindrical portion, the fluorescent tube having the phosphor layer formed on the inner surface of the conductor layer, and the fluorescent tube is disposed inside the fluorescent tube. A linear electron emission electrode extending in the longitudinal direction of the fluorescent tube and a stem fixed to one end of the fluorescent tube and holding the base end of the electron emission electrode, and the conductor layer is connected to the anode, In the fluorescent lamp in which the electron emission electrode is connected to the cathode, the electron emission electrode is stably provided by holding a portion other than the base end of the electron emission electrode to restrict the movement of the electron emission electrode. Since it becomes possible to hold | maintain, the quality of a fluorescent lamp can be improved.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of a fluorescent lamp according to a first embodiment of the present invention, and FIG. 2 is a partial sectional view of an anode side stem portion of the fluorescent lamp. In FIG. 2, only the fluorescent tube 10 is shown in cross section.

  In this fluorescent lamp 1, a transparent conductive layer 10b is formed on the inner surface of a glass tube 10a, and the fluorescent tube 10 having a fluorescent layer 10c formed on the inner surface of the conductive layer 10b is sealed at both ends of the fluorescent tube 10. The stems 11 and 13 to be stopped and a linear electron emission electrode 14 which is disposed substantially along the central axis of the fluorescent tube 10 and extends in the longitudinal direction of the fluorescent tube 10, and the conductor layer 10 b is held by the stem 11. The electron emission electrode 14 is connected to the lead wire 15 held by the stem 13 and connected to the cathode of the power supply (not shown). ing.

  As the electron emission electrode 14, a carbon wire formed on the surface of a metal wire such as nickel can be used.

The electron emission electrode 14 is fixedly held on the stem 13 in such a manner that a lead wire 15 is wound around and welded to the base end portion. (In FIG. 1, the lead wire 15 is not shown in cross section.)
In the fluorescent lamp 1 according to the present embodiment, as shown in FIG. A plurality of lead wires 21 are embedded in an annular shape so as to surround the tip of the electron emission electrode 14. Thereby, since the movement of the electron emission electrode 14 can be regulated, it is possible to prevent the fluorescent lamp 1 from causing luminance unevenness and a short circuit between the two electrodes.

  In this fluorescent lamp 1, when a voltage is applied between the conductor layer 10b of the fluorescent tube 10 and the electron emission electrode 14, electrons are emitted from the electron emission electrode 14 toward the conductor layer 10b, thereby causing fluorescence. The body layer 10c is excited to emit light.

  Next, a second embodiment of the present invention will be described. The fluorescent lamps of the embodiments described below are all different from the fluorescent lamp shown in FIG. 1 only in the holding means, and the rest are configured in the same manner. In each figure, the same elements as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted unless particularly required. FIG. 3 is a partial cross-sectional view of the anode stem portion of the fluorescent lamp according to the second embodiment of the present invention. In FIG. 3, only the fluorescent tube 10 is shown in cross section.

  As shown in FIG. 3, the fluorescent lamp 2 is held by an electrically neutral lead wire 22 embedded in the tip of the stem 11 and a cylindrical body 23 fixed to the lead wire 22. Thus, the tip of the electron emission electrode 14 is configured to be inserted into the cylindrical body 23. Even with such a configuration, the same effect as described above can be obtained.

  As shown in FIG. 4, a lead wire 24 formed in a spring shape may be fixed instead of the cylindrical body 23, and the tip of the electron emission electrode 14 may be inserted into the lead wire 24.

  Next, a third embodiment of the present invention will be described. FIG. 5 is a partial sectional view of the anode side stem portion of the fluorescent lamp according to the third embodiment of the present invention. In FIG. 5, only the fluorescent tube 10 is shown in cross section.

  As shown in FIG. 5, the holding means of the fluorescent lamp 3 is composed of a fitting member 25 that is fixed to the tip of the electron emission electrode 14 and fits with the tip of the stem 11. Even with such a configuration, the same effect as described above can be obtained.

  Next, a fourth embodiment of the present invention will be described. FIG. 6 is a cross-sectional view of a fluorescent lamp according to a fourth embodiment of the present invention.

  As shown in FIG. 6, the fluorescent lamp 4 holding means is configured by a holding member 26 that is disposed in the fluorescent tube 10 and has an insertion portion 26 a for inserting the electron emission electrode 14 at substantially the center. Yes. As the holding member 26, for example, a member having a hole (insertion portion 26a) in the vicinity of the center of a circular plate may be used. Even with such a configuration, the same effect as described above can be obtained.

  Next, a fifth embodiment of the present invention will be described. FIG. 7 is a sectional view of a fluorescent lamp according to a fifth embodiment of the present invention, and FIG. 8 is a sectional view taken along line VIII-VIII in FIG.

  As shown in FIGS. 7 and 8, the holding means for the fluorescent lamp 5 includes a plurality of protruding portions 27 that protrude from the outside to the inside of the fluorescent tube 10.

  It is necessary to remove the conductor layer 10b and the phosphor layer 10c so that the projecting portion 27 is not short-circuited even if it contacts the electron emission electrode 14, but it is conductive over the entire circumference of the fluorescent tube 10. If the body layer 10b and the phosphor layer 10c are removed, the conductor layer 10b is divided and a region that does not conduct to the anode is generated. Therefore, as shown in FIG. It is necessary to configure a part of the circumferential direction so that the conductor layer 10b and the phosphor layer 10c remain. In addition, if said requirements are satisfy | filled, there will be no restriction | limiting in particular about the position and number which a protrusion part forms. Even with such a configuration, the same effect as described above can be obtained.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above, and the movement of the electron emission electrode is restricted by holding a portion other than the base end of the electron emission electrode. Any mode may be used.

Sectional drawing of the fluorescent lamp by the 1st Embodiment of this invention Partial sectional view of the stem portion on the anode side of the fluorescent lamp The fragmentary sectional view of the anode side stem part of the fluorescent lamp by the 2nd Embodiment of this invention The fragmentary sectional view of the anode side stem part showing other modes of the above-mentioned fluorescent lamp Partial sectional drawing of the anode side stem part of the fluorescent lamp by the 3rd Embodiment of this invention Sectional drawing of the fluorescent lamp by the 4th Embodiment of this invention Sectional drawing of the fluorescent lamp by the 5th Embodiment of this invention Sectional view taken along line VIII-VIII in FIG.

Explanation of symbols

1-5 Fluorescent lamp 10 Fluorescent tube 10a Glass tube 10b Conductor layer 10c Fluorescent substance 11 Stem 12 Lead wire 13 Stem 14 Electron emission electrode 15 Lead wire 21 Lead wire 22 Lead wire 23 Tubular body 24 Lead wire 25 Fitting member 26 Holding member 27 Protruding part

Claims (5)

A fluorescent tube in which a transparent conductor layer is formed on the inner surface of the transparent cylindrical portion, and a phosphor layer is formed on the inner surface of the conductor layer;
A linear electron emission electrode disposed inside the fluorescent tube and extending in the longitudinal direction of the fluorescent tube;
A stem fixed to one end of the fluorescent tube, and holding a base end of the electron emission electrode;
In the fluorescent lamp in which the conductor layer is connected to the anode and the electron emission electrode is connected to the cathode,
A fluorescent lamp comprising holding means for holding a portion other than the base end of the electron emission electrode and regulating movement of the electron emission electrode.   2. The fluorescent lamp according to claim 1, wherein the holding means is a cylindrical body that is held at the other end of the fluorescent tube and into which the tip of the electron emission electrode is inserted. The fluorescent tube includes a fitting portion that protrudes from the outside to the inside of the fluorescent tube at the other end,
2. The fluorescent lamp according to claim 1, wherein the holding means is a fitting member fixed to the tip of the electron emission electrode and fitted into the fitting portion.   2. The fluorescent lamp according to claim 1, wherein the holding means is a holding member that is disposed in the fluorescent tube and has an insertion portion through which the electron emission electrode is inserted substantially at the center.   2. The fluorescent lamp according to claim 1, wherein the holding means is a protruding portion that protrudes inward from the outside of the fluorescent tube.

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