JP2010129193A - Discharge lamp, lighting equipment, and method for manufacturing discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably maintain optical characteristics by suppressing deterioration of emission efficiency. <P>SOLUTION: The discharge lamp includes a fluorescent tube 21 including electrode parts 12 at both ends. A holding part 24 for holding amalgam is provided inside the axial center of the fluorescent tube 21. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a discharge lamp such as a fluorescent lamp in which a phosphor is provided on the inner surface of a glass tube, a lighting device, and a method for manufacturing the discharge lamp.

  In general households, annular fluorescent lamps are prevalent, and in recent years, high-frequency dedicated fluorescent lamps are also becoming popular. Recently, with the revision of the Energy Conservation Law for lighting equipment, the fluorescent lamps are turned on. There is a need to further improve efficiency.

  In recent years, it is also necessary to limit the amount of mercury enclosed in a fluorescent lamp from the viewpoint of the environment. Instead of using liquid mercury, a solid mercury alloy containing a predetermined amount of mercury (hereinafter referred to as amalgam). Is called).

  In a fluorescent lamp in which this type of amalgam is used, in order to prevent a decrease in the luminous flux of the fluorescent tube that becomes a high temperature, the amalgam is arranged at the lowest temperature position (hereinafter referred to as the coldest point) in the fluorescent tube, It is possible to control the mercury vapor pressure in the discharge tube within an optimum range by well controlling the amount of mercury released from the amalgam. That is, it is necessary to arrange the amalgam at the coldest spot in the fluorescent lamp.

  An annular fluorescent lamp applied to a glow starter-type lighting device has a coldest spot in the vicinity of the glow lamp, that is, in the vicinity of the base, and is well known in the documents of the industrial association.

  Further, in the annular fluorescent lamp (FHC, FHD) dedicated for high-frequency lighting, the vicinity of the resin base is the coldest point. In the case of a fluorescent lamp having a high mount structure in which the position of the filament on one end side of the electrode portion of the fluorescent lamp is larger than the position of the filament on the other end side, the distance from the end of the fluorescent tube is increased. One end side of the electrode part, that is, the high mount side is the coldest point.

Therefore, the fluorescent lamp related to the present invention generally adopts a configuration in which the amalgam is arranged in the vicinity of the electrode portion or the base of the fluorescent tube. For example, Patent Document 1 discloses a configuration in which an amalgam holder for holding an amalgam is provided in the vicinity of a filament of a fluorescent lamp.
JP 2002-25501 A

  By the way, in the fluorescent lamp mentioned above, since the amalgam is arrange | positioned in the vicinity of the filament of an electrode part, the heat | fever which a filament generate | occur | produces will conduct to an amalgam. For this reason, there is a problem that the amount of mercury released from the amalgam varies due to the influence of thermal conductivity from the filament.

  Therefore, it is difficult for the fluorescent lamp to keep the mercury vapor pressure in the discharge tube within an optimum range, which leads to a decrease in the luminous efficiency of the fluorescent lamp, and the optical characteristics of the fluorescent lamp may become unstable.

  Therefore, the present invention solves the above-described problems, stably maintains the mercury vapor pressure in the discharge tube, prevents a decrease in light emission efficiency, and can stably obtain optical characteristics, a lighting device, and a discharge. An object is to provide a method for manufacturing a lamp.

  In order to achieve the above-described object, a discharge lamp according to the present invention includes a discharge tube having electrode portions provided at both ends. A holding portion for holding the amalgam is provided inside the axial center of the discharge tube.

  Moreover, the illuminating device which concerns on this invention is an illuminating device provided with the discharge lamp of this invention, and the lighting circuit part which makes a discharge lamp light.

  Moreover, the manufacturing method of the discharge lamp which concerns on this invention has the process of forming the discharge tube which has a holding | maintenance part holding an amalgam inside the center of an axial direction.

  In addition, the amalgam in this invention points out the solid mercury alloy containing mercury, for example, contains zinc mercury etc.

  According to the present invention, since the temperature fluctuation of the amalgam can be suppressed, the amount of mercury released from the amalgam can be stabilized. For this reason, this invention can maintain the mercury vapor pressure in a discharge tube stably, and can prevent the fall of the luminous efficiency of a discharge lamp.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, an illumination device 1 according to an embodiment includes an annular fluorescent lamp 2 as a discharge lamp, a base 6 that holds the fluorescent lamp 2, a lighting circuit unit 7 that lights the fluorescent lamp 2, And a dome-shaped shade member 8 that covers the fluorescent lamp 2. A plurality of holder members 9 for holding the fluorescent lamp 2 are provided on the base 6. The lighting circuit unit 7 includes a socket 10 that is electrically connected to the fluorescent lamp 2.

  The fluorescent lamp 2 of the embodiment has a fluorescent tube 11 as a discharge tube having a phosphor (not shown) provided on the inner surface. The phosphors are europium activated yttrium oxide phosphors having red emission, terbium, cerium activated lanthanum phosphate phosphors having green emission, europium activated barium magnesium aluminate phosphors or europium activated chloro having blue emission. It is configured to include any of strontium phosphate, calcium, and barium phosphors. Further, this phosphor is configured to include at least one kind of phosphor having blue light emission. The fluorescent lamp 2 may be applied to either a general type or a high frequency lighting type.

  As shown in FIGS. 2 and 3, the fluorescent tube 11 is formed in an annular shape, the electrode portions 12 at both ends are connected to each other via a base 13, and the electrode portion 12 is electrically connected to the base 13. Yes.

  In addition, an amalgam 15 for controlling the mercury vapor pressure in the fluorescent tube 11 is located inside the fluorescent tube 11 at a position facing the base 13 across the center of the circle formed by the annular fluorescent tube 11. A holding portion 14 to be held is provided.

  As shown in FIG. 4, the holding portion 14 is positioned vertically below the outer peripheral side of the fluorescent tube 11 in a use state attached to the lighting device 1 in a cross section orthogonal to the axial direction of the fluorescent tube 11. A part of the fluorescent tube 11 protrudes to the outer peripheral side of the fluorescent tube 11 and has a recess 16 formed inside the fluorescent tube 11. In other words, the opening edge of the recess 16 included in the holding portion 14 is formed adjacent to the lower inner surface of the fluorescent tube 11 attached to the lighting device 1 that is positioned vertically downward. The amalgam 15 is fixed in the recess 16.

  Since the concave portion 16 is formed at the position described above, the amalgam 15 disposed in the concave portion 16 is prevented from moving by gravity in a state where the fluorescent lamp 2 is mounted on the lighting device 1, and the amalgam 15 is It can be stably fixed in the recess 16.

  The holding portion 14 is provided at a position facing the base 13, that is, a position farthest from the electrode portion 12, so that it is possible to satisfactorily suppress temperature fluctuations of the amalgam 15 and is released from the amalgam 15. The amount of mercury that can be stabilized can be stabilized.

  In addition, the space on the outer peripheral side is relatively less affected by the hot air from the fluorescent lamp 2 than the space on the inner peripheral side of the fluorescent tube 11 and the temperature rise is suppressed, so that the recess 16 is formed on the outer peripheral side of the fluorescent tube 11. The temperature fluctuations of the amalgam 15 can be further suppressed by arranging.

  Moreover, since the holding | maintenance part 14 is formed in the diagonally downward direction, it is not only the horizontal use state which made the axial direction of the fluorescent tube 11 parallel to the horizontal direction, but the axial direction of the fluorescent tube 11 was made into the vertical direction. Even in a vertically placed usage state in parallel, the holding portion 14 can be positioned vertically downward. Therefore, the holding unit 14 can stably hold the amalgam 15 in the recess 16 without depending on the direction of use of the fluorescent lamp 2.

  A state in which the fluorescent lamp 2 configured as described above is mounted on the lighting device 1 will be described.

  The fluorescent lamp 2 is held by the holder member 9 of the lighting device 1, and the socket 10 is inserted into the base 13, whereby the electrode unit 12 is electrically connected to the lighting circuit unit 7 and can be lit. As shown in FIG. 1, the amalgam 15 is stably placed in the recess 16 of the holding portion 14 positioned vertically below the fluorescent lamp 2 with the fluorescent lamp 2 mounted on the lighting device 1. Contained.

  Moreover, the manufacturing method of the fluorescent lamp 2 configured as described above includes a step of forming the fluorescent tube 11 having the holding portion 14 described above.

  Moreover, although the holding | maintenance part 14 mentioned above protruded and formed from the outer peripheral surface of the fluorescent tube 11, as shown, for example in FIG. 5, the inner surface of the fluorescent tube 11 has the dish-like shape which has the side wall 19 holding the amalgam 15. The holding part 18 may be formed.

  As described above, the fluorescent lamp 2 has a favorable temperature variation of the amalgam 15 by providing the holding portion 14 that holds the amalgam 15 at a position facing the base 13, that is, a position farthest from the electrode portion 12. Thus, the amount of mercury released from the amalgam 15 can be stably controlled. For this reason, the fluorescent lamp 2 can stably maintain the mercury vapor pressure in the fluorescent tube 11, prevent a decrease in luminous efficiency, and stably obtain optical characteristics.

  In addition, although the fluorescent lamp 2 of embodiment mentioned above was formed in cyclic | annular form, you may form in a straight tube shape. As shown in FIG. 6, the fluorescent lamp 3 according to the embodiment includes a straight fluorescent tube 21 having electrode portions 12 provided at both ends.

  A holding portion 24 for holding the amalgam 15 is provided inside the center of the fluorescent tube 21 in the axial direction (length direction). The holding unit 24 is provided so as to be positioned vertically below the inner peripheral surface of the fluorescent tube 21 in a state where the fluorescent lamp 3 is mounted on the lighting device 1. This fluorescent lamp 3 can also achieve the same effect as the fluorescent lamp 2 described above.

  In addition, the discharge lamp according to the present invention is applied to the fluorescent lamp of the embodiment, but is not limited to an annular shape or a straight tube shape, for example, a U-shaped shape in which a central portion in the axial direction of the discharge tube is folded. It may be applied to a fluorescent lamp.

It is a schematic diagram which shows the illuminating device of this embodiment. It is a top view which shows the cyclic | annular fluorescent lamp of embodiment. It is a side view which shows the said fluorescent lamp. It is sectional drawing which shows the recessed part by which the amalgam was arrange | positioned. It is sectional drawing which shows the other structural example of a holding | maintenance part. It is a top view which shows the straight tube | pipe fluorescent lamp of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lighting apparatus 2 Fluorescent lamp 11 Fluorescent tube 12 Electrode part 13 Base 14 Holding part 16 Recessed part 15 Amalgam

Claims (7)

It has a discharge tube with electrode parts on both ends,
A discharge lamp in which a holding part for holding amalgam is provided inside the axial center of the discharge tube. The discharge tube is formed in an annular shape,
The electrode parts at both ends are connected to each other via a base, and the electrode part is electrically connected to the base,
The discharge lamp according to claim 1, wherein the holding portion is disposed at a position facing the base with a center of a circle formed by the annular discharge tube interposed therebetween.   The discharge lamp according to claim 2, wherein the holding portion is disposed on an outer peripheral side of the annular discharge tube.   The holding portion is positioned vertically below the outer peripheral side of the discharge tube in use in a cross section orthogonal to the axial direction of the discharge tube, and a part of the discharge tube is on the outer peripheral side of the annular discharge tube The discharge lamp according to claim 3, wherein the discharge lamp has a recess formed inside the discharge tube by projecting into the discharge tube. The discharge lamp according to any one of claims 1 to 4,
A lighting device comprising: a lighting circuit unit for lighting the discharge lamp.   The manufacturing method of a discharge lamp which has the process of forming the discharge tube which has a holding part holding an amalgam in the center of an axial direction.   The method for manufacturing a discharge lamp according to claim 6, wherein in the step of forming the discharge tube, the annular discharge tube is formed.

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