JP2007026729A - Compact self-ballasted fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp with high luminance efficiency capable of emitting light even from a root of a base. <P>SOLUTION: The compact self-ballasted fluorescent lamp is provided with an arc tube 6, a globe 3 for covering the arc tube 6, the base 2 directly or indirectly fixed to the globe 3, a lighting circuit substrate 4 fixed in the base 2, and a lamp holder 5 for fixing the arc tube 6 to sides of the globe 3 and the base 2. A maximum width (a) in a direction orthogonal to a longitudinal direction of the arc tube 6 is equal to or less than an inner diameter c of the base 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a light bulb-type fluorescent lamp improved so that the end of the globe is brought close to the base and light is emitted to the base of the globe.

Conventionally, as an example of this type of bulb-type fluorescent lamp, a double spiral arc tube is covered with a glove having the same or approximate size as a general lighting bulb such as an incandescent bulb, and the arc tube and the globe are shielded from light. It is attached to the base via a cover (see, for example, Patent Document 1).
JP 2004-311032 A

  However, in such a conventional bulb-type fluorescent lamp, the cover is formed of a synthetic resin having a light shielding property and is exposed to the outside with a relatively large size between the globe and the base. Light emitted to the side is shielded by this cover, and light distribution characteristics different from those of general lighting bulbs such as incandescent bulbs are formed.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a bulb-type fluorescent lamp in which a glove can emit light up to the base on the base side.

  The invention according to claim 1 includes an arc tube, a globe covering the arc tube, a base fixed directly or indirectly to the globe, a lighting circuit board fixed in the base, and an arc tube An arc tube fixing means for fixing to the globe and the base side, wherein the maximum width in the direction perpendicular to the longitudinal direction of the arc tube is equal to or less than the inner diameter of the base. This is a fluorescent lamp.

  The invention according to claim 2 is an arc tube having a spiral shape with a tube diameter of 5 to 8 mm and a maximum outer diameter of 30 mm, and having a protruding portion at the top on one end side where the coldest portion is formed at the time of lighting; A globe covering the lamp; a thermally conductive medium that thermally couples the protruding portion of the arc tube to the globe; a base fixed directly or indirectly to the globe; and a lighting disposed in the base A bulb-type fluorescent lamp comprising: a circuit board; and arc tube fixing means for fixing the arc tube to the globe and the base side.

  The invention according to claim 3 is the light bulb shaped fluorescent lamp according to claim 1 or 2, wherein the arc tube fixing means is provided on the lighting circuit board.

  According to the invention of claim 1, since the width of the arc tube is equal to or less than the inner diameter of the base, the inner surface of the base portion of the globe fixed to the base side and the end surface in the width direction of the arc tube A gap is formed between them. For this reason, since light emitted from the arc tube can be irradiated to the outside through the gap, it is possible to emit light up to the base of the globe.

  According to the invention of claim 2, since the protruding portion of the arc tube is thermally coupled to the globe by the heat conductive medium, the protruding portion of the arc tube can be formed in the coldest portion.

  For this reason, it is not necessary to extend the thin tube of the arc tube to the base side and enclose the amalgam in the thin tube.

  Further, since the arc tube has a spiral shape, the end portion thereof is in a substantially parallel direction with respect to the lighting circuit board, that is, in a lateral direction. For this reason, the gap between the arc tube end and the lighting circuit board can be made narrower than when the arc tube end and the exhaust pipe are perpendicular to the lighting circuit board. Can be fixed to the lighting circuit board with an adhesive, the amount of the adhesive used can be reduced and the certainty of the fixing can be improved.

  According to the invention of claim 3, since the one end portion of the arc tube is held by the circuit board directly or indirectly via the arc tube fixing means, the reliability of the arc tube support can be improved.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same or an equivalent part in several attached drawing.

  FIG. 1 is a partially cutaway front view of a light bulb shaped fluorescent lamp 1 according to a first embodiment of the present invention. This bulb-type fluorescent lamp 1 has the same or approximate dimensions as a general lighting bulb such as an incandescent bulb in an opening end 2a at the lower end in FIG. 1 of an E26-type base 2 used for general lighting such as an incandescent bulb. A reduced diameter opening end 3a at the upper end in FIG. 1 of the globe 3 is fitted, and the fitted part is fixed by an adhesive such as silicon resin (not shown). The general lighting bulb is defined in JIS C 7501. The globe 3 is transparent or milky white having light diffusibility, and has translucency. The globe 3 is formed of glass or a synthetic resin into a smooth curved surface having substantially the same shape as a glass bulb of a general lighting bulb.

  In the base 2, a horizontal and disk-shaped lighting circuit board 4 substantially parallel to the opening end 2 a is accommodated, and the outer peripheral edge of the lighting circuit board 4 is fixed by an adhesive such as silicon resin. . A plurality of lighting circuit components 4a, 4a,... Are mounted on at least one of the upper surface and the lower surface in FIG. 1, and the lighting circuit board 4 is configured as an inverter lighting circuit (high frequency lighting circuit).

  The lighting circuit board 4 is fixed to the outer peripheral edge of the lower surface in FIG. 1 by a synthetic resin such as silicon resin at the opening end portion of the bottomed cylindrical synthetic resin lamp holder 5 as an example of the arc tube fixing means. is doing. The reduced diameter opening end of the globe 3 is fitted and fixed to the outer surface of the body of the lamp holder 5. A reduced-diameter opening end 3 a of the globe 3 is fitted and fixed to the outer peripheral surface of the body of the lamp holder 5.

  The lamp holder 5 has, at the bottom thereof, mounting holes that respectively penetrate the plurality of ends of the arc tube 6 in the axial direction, and the outer periphery of the end of the through-hole of the arc tube 6 that passes through these mounting holes. Is filled with an adhesive and fixed to the lamp holder 5.

  The arc tube 6 is formed of a bent fluorescent lamp obtained by bending a single straight tube fluorescent lamp into a required shape such as a double U (double U) or a bowl shape, and is accommodated in the globe 3. The arc tube 6 has a lead wire (not shown) connected to the pair of electrode sealing ends connected to an output terminal of the lighting circuit board 3, and a lead wire (not shown) is connected to the input terminal of the lighting circuit board 3. Thus, the shell (the inner surface of the body portion) of the base 2 and the inner surface of the outlet 2b are fixed by soldering or the like.

  Further, the arc tube 6 is provided with a thin tube S for housing amalgam or the like at the upper end in FIG. 1 such as one of the pair of electrode sealing ends. This narrow tube S penetrates the lamp holder 5 and the lighting circuit board 3 in the vertical direction (plate thickness direction) and extends to the upper part of the base 2 in FIG. It comes to form.

  The arc tube 6 is formed such that the width dimension a in the direction orthogonal to the lamp axis LO in the longitudinal direction (lateral direction in FIG. 1) is smaller than the diameter b of the lighting circuit board 3 (a <b). . The diameter c of the opening end 2a of the base 2 is formed larger than the diameter b of the lighting circuit board 3 (c> b), and these have a relationship of a <b <c. Further, the arc tube 6 has a width b smaller than the diameter (inner diameter) c of the opening end 3 a of the globe 3. The width direction dimension a of the arc tube 6 may be equal to or smaller than the diameter c of the opening end 2a of the base 2.

  Therefore, according to the bulb-type fluorescent lamp 1, the globe 4 is directly fixed to the base 2, the lighting circuit board 3 is fixed in the base 2, and the arc tube 5 is fixed by the lamp holder 5 fixed to the lighting circuit board 3. Therefore, the conventional light-shielding cover that holds the globe 4 and the arc tube 6 and is attached to the base 2 can be eliminated.

  For this reason, since the light can be emitted brightly by the light emission of the arc tube 6 up to the base of the base 2, that is, the boundary between the base 2 and the globe 4, the luminous efficiency of the bulb-type fluorescent lamp 1 as a whole can be improved. In addition, it is possible to obtain almost the same or similar light distribution characteristics as a general lighting bulb such as an incandescent bulb.

  Further, since the width a of the arc tube 6 is made smaller than the diameter b of the lighting circuit board 3, the end surface in the width direction of the arc tube 6 in the vicinity of the opening end 2a of the base 2 and the end surface in the width direction and the lateral direction in FIG. Since a gap g is formed between the opposing inner surface of the reduced diameter end of the globe 4, light emitted from the arc tube 6 can be emitted to the outside through the gap g. Thereby, the brightness of the boundary portion between the base 2 and the globe 4 can be further improved.

  FIG. 2 is a front view showing a part of a bulb-type fluorescent lamp 11 according to the second embodiment of the present invention in a longitudinal section. The bulb-type fluorescent lamp 11 has a glass globe 13 having the same or similar dimensions as the bulb for general illumination in an opening end portion (lower end portion in FIG. 1) 12a of an E26-type base 12 for a general illumination bulb such as an incandescent bulb. A reduced diameter opening end 13a at the upper end in FIG. 1 is fitted, and the fitted end is fixed by silicon resin. The general lighting bulb is defined in JIS C 7501. The globe 13 is transparent or milky white having light diffusibility and the like and has translucency. The globe 13 is formed of a smooth curved surface having substantially the same shape as a glass bulb of a general lighting bulb using glass or synthetic resin.

  In the base 12, a horizontal and disk-shaped lighting circuit board 14 that is substantially parallel to the opening end 12 a is accommodated, and the outer peripheral edge of the lighting circuit board 14 is fixed by an adhesive such as silicon resin. .

  The opening end of the lamp holder 15 made of a synthetic resin with a bottomed cylindrical shape is fixed to the outer peripheral edge portion of the lighting circuit board 14 in FIG. 2 with an adhesive such as silicon resin.

  The lamp holder 15 has its outer surface fixed to the inner peripheral surface of the reduced diameter opening end 13a of the globe 13 with an adhesive or the like. Further, the lamp holder 15 is formed with insertion holes for holding the pair of electrode sealing end portions 16a and 16b of the double spiral arc tube 16 from substantially the lateral direction at the bottom thereof. These insertion portions are fixed by filling with an adhesive.

  The arc tube 16 is formed in a double helix by bifurcating a circular glass bulb having a tube diameter of 5 to 8 mm in two directions around the protruding portion 6c and bending it in a spiral shape. The outer diameter is 300 mm. The double spiral central portion (the central portion of the lower surface in FIG. 2) is integrally connected with a protruding portion 16c protruding downward in FIG. 2, and this protruding portion 16c is an example of a heat conductive conductor. The silicon adhesive 17 is fixed to the inner surface of the top of the globe 13 and is thermally coupled to the globe 13 with high heat dissipation that exposes the arc tube 16 to the outside.

  The arc tube 16 has a pair of electrode sealing ends 16a and 16b, which are a pair of ends of a double helix, inserted through the insertion holes of the lamp holder 15, and then the upper surface of the lighting circuit board 14 in FIG. In the state of being in direct contact with each other, the electrode sealing end portions 16a and 16b are fixed by an adhesive in a state of being opposed to each other with a predetermined interval in the front and back direction of the paper surface of FIG. An exhaust pipe (not shown) projects from the tip surfaces of the pair of electrode sealing end portions 16a and 16b. However, the exhaust pipe is not shown in the horizontal direction, that is, substantially parallel to the lower surface of the lighting circuit board 14 in FIG. Since the protrusions are provided, the pair of electrode sealing ends 16 a and 16 b can be brought into direct contact with the lighting circuit board 14.

  Therefore, according to the bulb-type fluorescent lamp 11, the protrusion 16c of the double spiral arc tube 16 is curved by the globe 17 having a relatively large surface area exposed to the outside by the silicon adhesive 17 having thermal conductivity. Since it adheres to the inner surface of the top end portion, the heat dissipation of the arc tube 16 can be improved and the coldest portion can be formed.

  For this purpose, a process is performed in which an elongated thin tube is projected like the arc tube 6 of the bulb-type fluorescent lamp 1 shown in FIG. 1 and an insertion hole is formed in the lamp holder 5 and the lighting circuit board 4 for inserting the thin tube. Can be omitted.

  2 is supported by the top (lower) end portion of the globe 13 and the pair of electrode sealing end portions 16a and 16b are connected to the lamp holder 15, the lighting circuit board 14, and the lamp circuit board 14. Therefore, the support strength of the arc tube 16 can be improved.

  Further, since the pair of electrode sealing ends 16a and 16b of the arc tube 16 are close to the lighting circuit substrate 14 in the lateral direction, that is, from the substantially parallel direction, and the exhaust pipe (not shown) is lateral, the pair of electrode seals. It can be fixed by minimizing the distance between the toe portions 16a and 16b and the lighting circuit board 14 or by directly contacting them.

  FIG. 3 is a front view showing a part of a bulb-type fluorescent lamp 11A according to the third embodiment of the present invention in a longitudinal section. This bulb-type fluorescent lamp 11A is characterized in that in the bulb-type fluorescent lamp 11 shown in FIG. 2, the lamp holder 15 is replaced with the second lamp holder 15A, and the other configuration is the same.

  That is, the second lamp holder 15A has a cylindrical or cylindrical shape made of a synthetic resin that is inserted in a required amount from the spiral opening ends of the arc tube 16 on the side of the pair of electrode sealing ends 16a and 16b. Thus, the lighting circuit board 14 protrudes from the center of the lower surface in FIG.

  Therefore, according to this bulb-type fluorescent lamp 11A, the gap between the outer peripheral surface of the cylindrical portion of the cylindrical or cylindrical second lamp holder 15A and the inner peripheral surface of the central opening (cavity) of the spiral arc tube 16 is provided. The electrode sealing end portions 16a and 16b of the arc tube 16 can be supported by the second lamp holder 15A by filling and fixing with an adhesive such as a silicon adhesive.

  In each of the above embodiments, the case where the base 16 is made of metal has been described. However, the present invention is not limited to this. For example, the base body is formed of a synthetic resin, and the outer surface thereof is silver (Ag). Or a metal plating of a conductor such as aluminum (Al).

BRIEF DESCRIPTION OF THE DRAWINGS The front view which shows a part of bulb-type fluorescent lamp concerning the 1st Embodiment of this invention with a longitudinal cross-sectional view. The front view which shows a part of bulb-type fluorescent lamp concerning the 2nd Embodiment of this invention with a longitudinal cross-sectional view. The front view which shows a part of bulb-type fluorescent lamp concerning the 3rd Embodiment of this invention with a longitudinal cross-sectional view.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,11,11A ... Light-bulb-type fluorescent lamp, 2,12 ... Base, 3,13 ... Globe, 3a, 13a ... Reduced diameter opening end of globe, 4,14 ... Lighting circuit board, 5,15 ... Lamp holder, 15a 2nd lamp holder, 6 ... bent arc tube, 16 ... double spiral arc tube, 16 ... projection of double spiral arc tube, 17 ... silicon adhesive (thermally conductive medium).

Claims (3)

Arc tube,
A glove covering this arc tube;
A base that is directly or indirectly attached to the glove;
A lighting circuit board fixed in the base;
Arc tube fixing means for fixing the arc tube to the globe and the base side;
Comprising
A bulb-type fluorescent lamp characterized in that the maximum width in the direction perpendicular to the longitudinal direction of the arc tube is equal to or less than the inner diameter of the base. An arc tube having a spiral shape with a tube diameter of 5 to 8 mm and a maximum outer diameter of 30 mm, and having a protrusion at the top on one end side where the coldest part is formed when lit;
A glove covering this arc tube;
A thermally conductive medium that thermally couples the protrusion of the arc tube to the globe;
A base fixed directly or indirectly to the glove;
A lighting circuit board disposed in the base;
Arc tube fixing means for fixing the arc tube to the globe and the base side;
A bulb-type fluorescent lamp characterized by comprising: 3. The light bulb shaped fluorescent lamp according to claim 1, wherein the arc tube fixing means is provided on the lighting circuit board.

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