JP4861856B2 - Light bulb shaped fluorescent lamp - Google Patents

Description

  The present invention relates to a light bulb-type fluorescent lamp using a helical luminous tube, and in particular, a bulb-type fluorescent light that can prevent the outer tube glove from falling when the outer tube glove is cracked in a circumferential shape along the plate. Regarding lamps.

  In recent years, light bulb-type fluorescent lamps have been reduced in size to the extent corresponding to general incandescent light bulbs, and the demand for replacing light sources of general incandescent light bulbs with light bulb-type fluorescent lamps has been promoted.

  As an example of the bulb-type fluorescent lamp, a fluorescent lamp is proposed that has a longer discharge path by bending the arc tube in a spiral shape (see, for example, Patent Document 1).

  Further, in order to provide a light bulb shaped fluorescent lamp that can suppress the temperature rise of the light emitting tube even when the light emitting tube emits light and that does not deteriorate the design of the lamp so much, the light bulb shaped fluorescent lamp is double-layered. A spiral arc tube, a holder that supports the arc tube, a case that attaches the holder and includes a base, and a glove that covers the arc tube. The globe is an A-type, and a diffusion film for diffusing light emitted from the arc tube is formed on the inner surface. In addition, the arc tube has a protrusion that becomes the coldest spot of the arc tube when the lamp is lit. There has been proposed a low-pressure mercury lamp in which the protrusion is on a double spiral-shaped swivel shaft that is the shape of an arc tube and is thermally coupled to the globe via a heat conducting medium (for example, a patent) Reference 2).

  4 and 5 are diagrams showing a conventional bulb-type fluorescent lamp 1, FIG. 4 is a front view showing a cross section of the bulb-type fluorescent lamp 1, and FIG. As shown in FIG. 4, the bulb-type fluorescent lamp 1 houses a resin-made housing 4 to which a base 5 having an electrical connection portion is joined at one end, and a spiral luminous tube 2 shown in FIG. 5 inside, A glass outer tube glove 6 joined to the other end of the housing 4 is provided.

  The end of the spiral luminous tube 2 is inserted into the plate 8 and fixed to the plate 8 with an adhesive such as silicon. A ballast 3 (lighting circuit) made of various electronic components mounted on a substrate 9 is attached to the side of the plate 8 opposite to the spiral arc tube 2.

  The plate 8 to which the spiral arc tube 2 and the stabilizer 3 are attached is fixed to the housing 4. Further, the outer tube globe 6 is fixed to the gap between the housing 4 and the plate 8 by adhesion.

At the tip of the spiral arc tube 2 (on the side opposite to the plate 8), a protruding portion 2a serving as the coldest spot of the spiral arc tube 2 is formed. This protrusion 2a is thermally coupled to the outer tube globe 6 via a silicon resin 10 which is a heat conductive resin. The protruding portion 2a has a hemispherical tip, and a cylindrical shape extending toward the root.
JP 2003-263972 A JP 2004-311032 A

Since the conventional fluorescent lamp 1 using the helical luminous tube 2 is configured as described above, it has the following problems.
(1) The outer tube globe 6 is made of glass. However, if the glass is poor, cracks may be generated. In this case, in the conventional bulb-type fluorescent lamp 1, the protruding portion 2 a of the spiral luminous tube 2 is coupled to the outer bulb glove 6 through the silicon resin 10. Retained. However, since the protruding portion 2a has a hemispherical tip and a cylindrical shape toward the root portion, the downward load of the silicon resin 10 (the outer tube glove that is broken into the opening circumferentially along the plate) 6), the portion where the silicon resin 10 is caught is not in the protruding portion 2a. Therefore, there is a risk of dropping when the outer tube globe 6 is broken.
(2) Since the protruding portion 2a of the spiral luminous tube 2 is thermally coupled to the outer tube globe 6 via the silicon resin 10, the heat generated from the spiral luminous tube 2 is transferred from the silicon resin 10 to the outer tube. It is transmitted to the globe 6 and radiated. As a result, the temperature of the protrusion 2a, which is the coldest spot of the spiral arc tube 2, is lowered, and the mercury vapor pressure in the spiral arc tube 2 approaches the optimum value, but the surface area of the protrusion 2a is sufficient. It was not big.

  The present invention has been made to solve the above-described problems, and has a low risk of falling even when a glass outer tube glove is cracked, and a protrusion serving as the coldest spot of the spiral arc tube, An object of the present invention is to provide a bulb-type fluorescent lamp capable of reducing the thermal resistance between the resin and the silicon resin.

  The bulb-type fluorescent lamp according to the present invention is a bulb-type fluorescent lamp using a spiral arc tube, wherein a plate to which an electrode side end of the spiral arc tube is fixed, a base is joined to one end, and an opening at the other end A housing on which the plate is fixed, an outer tube glove that is inserted and fixed in a gap between the housing and the plate on the opening side of the housing, and that houses the spiral arc tube, and a counter electrode side of the spiral arc tube A protrusion provided at the end and serving as the coldest spot; a thermally conductive medium that thermally connects the protrusion and the outer tube globe; and a protrusion provided to the outer tube globe along the plate. And a holding portion that holds the outer tube glove that is cracked in the circumferential direction of the opening along the plate via a heat conductive medium.

  Moreover, the bulb-type fluorescent lamp according to the present invention is characterized in that the holding portion is embedded in a thermally conductive medium.

  Moreover, the bulb-type fluorescent lamp according to the present invention is characterized in that the holding portion provided in the protruding portion of the spiral arc tube is configured with an enlarged diameter portion having a larger diameter than other portions of the protruding portion.

  Moreover, the bulb-type fluorescent lamp according to the present invention is characterized in that the diameter-expanded portion has an inverted T-shaped cross section.

  Moreover, the bulb-type fluorescent lamp according to the present invention is characterized in that the enlarged diameter portion has an L-shaped cross section.

  In addition, the bulb-type fluorescent lamp according to the present invention is characterized in that the expanded diameter portion has a bowl shape in cross section.

  In addition, the bulb-type fluorescent lamp according to the present invention is characterized in that the holding portion of the spiral luminous tube is formed in such a shape that the middle thereof is constricted.

  Since the bulb-type fluorescent lamp according to the present invention is provided with a holding portion that holds the cracked outer tube globe via the heat conductive medium when the outer tube globe is cracked in the protruding portion of the spiral arc tube, There is little risk of falling even if the glass outer tube glove breaks.

  In addition, the bulb-type fluorescent lamp according to the present invention comprises the holding portion provided at the protruding portion of the spiral arc tube with a diameter-expanded portion, in addition to the above effect, the coldest spot of the spiral arc tube Since the thermal resistance between the protruding portion serving as the location and the silicon resin can be reduced, the temperature of the projecting portion serving as the coldest spot can be lowered.

Embodiment 1 FIG.
FIG. 1 to FIG. 3 are diagrams showing Embodiment 1, FIG. 1 is a front view of a bulb-type fluorescent lamp 1, FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is.

  First, the external appearance of the bulb-type fluorescent lamp 1 will be described with reference to FIG. The bulb-type fluorescent lamp 1 is an example of a general bulb-type A shape. The bulb-type fluorescent lamp 1 includes a resin housing 4 having a base 5 (E26) having an electrical connection with a socket (not shown) at one end, and a spiral arc tube 2 inside. A glass outer tube glove 6 joined to the other end is provided. A diffusion film (not shown) for diffusing light emitted from the spiral luminous tube 2 is formed on the inner surface of the outer tube globe 6 so that the inside of the outer tube globe 6 cannot be seen.

  With reference to FIG. 2, the internal configuration of the bulb-type fluorescent lamp 1 will be described. In the bulb-type fluorescent lamp 1, a spiral arc tube 2 (double spiral shape as shown in FIG. 3) is inserted into the plate 8 at the electrode side end and fixed to the plate 8 with an adhesive such as silicon. The The electrode-side end portion is not the main subject in this embodiment, and thus the description thereof is omitted. A predetermined amount of mercury is sealed in the spiral arc tube 2 in a single form. Further, a mixed gas of argon and neon gas is sealed as a buffer gas from an exhaust pipe (not shown).

  A substrate 9 is attached to the surface of the plate 8 opposite to the spiral arc tube 2 (on the base side). Various electronic components are mounted on the substrate 9. These various electronic components constitute a ballast 3 (lighting circuit) for lighting the spiral arc tube 2.

  The plate 8 to which the spiral luminous tube 2 and the substrate 9 are attached is attached to the inside of the housing 4 by fitting, bonding or the like. A gap is formed between the housing 4 and the plate 8 on the opening side (the side opposite to the base 5) of the housing 4. The opening side end of the outer tube globe 6 is inserted into this gap, and the outer tube globe 6 is fixed to the housing 4 and the plate 8 with an adhesive such as silicon resin, for example.

  The present embodiment is characterized by the shape of the protruding portion 2a of the spiral arc tube 2. The tip of the projecting portion 2a has a larger diameter than other portions. This portion is referred to as an enlarged diameter portion 2b (an example of a holding portion).

  The protruding portion 2a of the spiral luminous tube 2 is thermally coupled to the outer tube globe 6 via a silicon resin 10 (an example of a heat conductive medium) having heat conductivity. Then, the silicon resin 10 is filled so that the enlarged diameter portion 2 b is buried in the silicon resin 10. The enlarged diameter portion 2b may be located anywhere on the protruding portion 2a. The amount of silicon resin 10 is smaller at the tip.

  As described above, by providing the protruding portion 2a of the spiral arc tube 2 with the enlarged diameter portion 2b having the tip diameter larger than that of other portions, the enlarged diameter portion 2b is embedded in the silicon resin 10. Even if the outer tube globe 6 made of glass is broken, the silicone resin 10 is caught by the enlarged diameter portion 2b, and the possibility that the outer tube globe 6 falls is reduced.

  The outer tube glove 6 performs a process of cutting the opening side and removing the distortion by heating and annealing the vicinity of the cut opening. However, circumferential distortion tends to remain along the opening, and if heat annealing is insufficient, cracks may occur circumferentially along the opening due to thermal stress such as heat generation and cooling when the lamp is turned off. Rarely occurs.

  In addition, by providing the protruding portion 2a of the spiral luminous tube 2 with the enlarged diameter portion 2b, the surface area of the protruding portion 2a is increased. Thereby, the thermal resistance between the protrusion part 2a and the silicon resin 10 becomes small, and there exists an effect which reduces the temperature of the protrusion part 2a which is the coldest point location.

  There are various shapes of the enlarged-diameter portion 2b of the protruding portion 2a of the spiral luminous tube 2 other than the one having the inverted T-shaped cross section shown in FIGS. Even if the outer tube globe 6 is cracked, any shape can be used as long as the silicon resin 10 is caught on the enlarged diameter portion 2b of the protruding portion 2a of the spiral luminous tube 2 and the outer tube globe 6 can be prevented from falling. Shape may be sufficient. For example, the cross section has a J shape, an L shape, a bowl shape, or the like. Although it is desirable that the surface area of the protruding portion 2a is large, it does not have to be large. Priority is given to the shape in which the silicon resin 10 is caught.

  Accordingly, it is only necessary that the protruding portion 2a of the spiral luminous tube 2 has an engaging portion on which the silicon resin 10 is caught. For example, the surface area of the protruding portion 2a is reduced, but the intermediate portion of the protruding portion 2a may be constricted. In this case, it is possible to prevent the outer tube globe 6 from falling due to the silicon resin 10 buried up to the middle part of the projecting part 2a being caught by the middle part of the projecting part 2a.

FIG. 3 shows the first embodiment, and is a front view of the bulb-type fluorescent lamp 1. FIG. 2 shows the first embodiment and is a cross-sectional view taken along the line AA in FIG. FIG. 3 shows the first embodiment, and is a front view showing a cross section of the bulb-type fluorescent lamp 1. The front view which shows the cross section of the conventional light bulb-type fluorescent lamp 1. FIG. The front view of the helical arc tube 2 of the conventional bulb-type fluorescent lamp 1.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Light bulb-type fluorescent lamp, 2 Spiral luminous tube, 2a Protruding part, 2b Expanding part, 3 Ballast, 4 Housing, Base, 6 Outer tube globe, 8 Plate, 9 Substrate, 10 Silicon resin

Claims (7)

In a bulb-type fluorescent lamp using a spiral arc tube,
A plate to which an electrode side end of the spiral arc tube is fixed;
A housing in which a base is joined to one end and the plate is fixed to the opening side of the other end;
An outer tube glove which is inserted and fixed in a gap between the housing and the plate on the opening side of the housing and houses the spiral arc tube;
Protruding part provided at the end of the spiral arc tube on the side opposite to the electrode, which becomes the coldest spot,
A thermally conductive medium that thermally couples between the protrusion and the outer tube globe;
When the outer tube glove is provided on the protrusion and the outer tube glove is cracked in the opening circumferential shape along the plate, the outer tube glove that is broken in the opening circumferential shape along the plate is used as the thermal conductive medium. A bulb-type fluorescent lamp characterized by comprising a holding part for holding via a lamp.   The bulb-type fluorescent lamp according to claim 1, wherein the holding portion is embedded in the thermally conductive medium.   3. The bulb-type fluorescent lamp according to claim 1, wherein the holding portion provided in the protruding portion of the spiral luminous tube is configured by an enlarged diameter portion having a larger diameter than other portions of the protruding portion. lamp.   4. The bulb-type fluorescent lamp according to claim 3, wherein the enlarged-diameter portion has an inverted T-shaped cross section.   4. The bulb-type fluorescent lamp according to claim 3, wherein the enlarged-diameter portion has an L-shaped cross section.   4. The bulb-type fluorescent lamp according to claim 3, wherein the enlarged-diameter portion has a bowl shape in cross section.   The light bulb shaped fluorescent lamp according to claim 1 or 2, wherein the holding portion is formed by forming the projecting portion of the spiral luminous tube so as to be constricted in the middle thereof.

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