JP2006302589A - Compact self-ballasted fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact self-ballasted fluorescent lamp capable of decreasing a temperature of a coldest point irrespective of a vertical direction of a light emitting tube, and obtaining stable output in normal lighting. <P>SOLUTION: The compact self-ballasted fluorescent lamp 1 comprises a light emitting tube 2, a stabilizer 3 for lighting the light emitting tube 2, a plate 8 for holding the light emitting tube 2 on one side and mounting the stabilizer 3 on the other side, a housing 4 for housing the stabilizer 3 and having a base 5, and an outer tube globe 6 for covering the light emitting tube 2. The compact self-ballasted fluorescent lamp 1 with mercury sealed is provided with a projected part 2a formed on a tip end 7a on an opposite side of the base 5 of the light emitting tube 2 and becoming the coldest point when the light emitting tube 2 is lightened in a mounting state with the base 5 side up, and an evacuating tube 7 which is provided for evacuating an inside of the light emitting tube 2, extends to an inside of the housing 4 by passing from the light emitting tube 2 to the plate 8, and wherein the tip end 7a becomes the coldest point when the light emitting tube 2 is lightened in the mounting state with the base 5 side down. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  This invention improves the luminous flux rise characteristics by enclosing mercury instead of amalgam and extending the coldest spot to the tip of the lamp when the base is up and to the vicinity of the base when the base is down. The present invention relates to a bulb-type fluorescent lamp that is formed at the tip of a sealed tube and can provide stable light output both when the base is up and when the base is down.

  As a light source that replaces the incandescent bulb, a bulb-type fluorescent lamp having high lamp efficiency and a long lifetime has been proposed. As such a bulb-type fluorescent lamp, there is one provided with a double spiral arc tube. FIG. 7 is a front view showing a cross section of such a conventional bulb-type fluorescent lamp. As shown in the figure, a bulb-type fluorescent lamp 1 includes a double spiral arc tube 2, a ballast 3 for lighting the arc tube 2, and a housing 4 that houses the ballast 3 and has a base 5. And an outer tube glove 6 that covers the arc tube 2. In addition to the mixed gas as the buffer gas, mercury alone is enclosed in the arc tube 2 in order to improve the luminous flux rising characteristics (no amalgam is used).

  The end of the glass tube is inserted into the plate 8 and the arc tube 2 is fixed to the plate 8 with an adhesive such as silicon.

  A convex portion 2a bulging downward (in a direction opposite to the base 5) is formed at the lower end portion of the arc tube 2, and the convex portion 2a and the lower end portion of the inner wall of the outer tube globe 6 are transparent. They are thermally coupled by a thermally conductive medium 15 made of silicon.

  The reason for providing the convex portion 2a is that by forming the convex portion 2a, the space in the convex portion 2a is separated from the trajectory of electrons flowing between the electrodes, and the temperature (cold point temperature) in the convex portion 2a further decreases. It is.

In addition, the arc tube 2 and the outer tube globe 6 are thermally coupled by the heat conductive medium 15 when the light bulb-type fluorescent lamp 1 is lit and the temperature of the arc tube 2 rises. This is because it is transmitted to the outer tube globe 6 through the heat conductive medium 15 and the temperature of the arc tube 2, particularly the temperature at the coldest spot at the lower end of the arc tube 2 can be suppressed. In this way, when the arc tube 2 is normally lit with the electrode facing up, the coldest spot temperature of the arc tube is reduced by the convex coldest point provided on the top of the arc tube and the heat conductive medium 15. (See, for example, Patent Document 1).
JP 2004-87397 A

  In the conventional bulb-type fluorescent lamp, the coldest spot of the arc tube is formed at the top of the arc tube, so that when the arc tube is mounted with the base on the top, the coldest spot temperature is low and a stable output can be obtained. When the opposite arc tube is mounted with the base down, there has been a problem that the coldest spot temperature rises and a stable output cannot be obtained.

  The present invention has been made to solve the above-described problems, and is a bulb-type fluorescent lamp that can reduce the temperature of the coldest point regardless of the vertical direction of the arc tube and can obtain a stable output during normal lighting. The purpose is to provide.

  A bulb-type fluorescent lamp according to the present invention includes an arc tube, a ballast for lighting the arc tube, a plate that holds the arc tube on one side, and a ballast is attached to the other side, In a bulb-type fluorescent lamp that contains a housing and has a base, and an outer tube glove that covers the arc tube and encloses mercury, it is formed at the tip of the arc tube opposite to the cap, with the cap facing up The projection is the coldest point when the arc tube is turned on in the mounted state, and is provided for exhausting the inside of the arc tube, extending from the arc tube through the plate into the housing, with the base down And an exhaust pipe whose tip is the coldest point when the arc tube is turned on.

  With the above configuration, the bulb-type fluorescent lamp according to the present invention can reduce the temperature at the coldest point regardless of the vertical direction of the arc tube, and a stable output can be obtained during normal lighting.

Embodiment 1 FIG.
1 to 5 are diagrams showing Embodiment 1, FIG. 1 is a front view of a bulb-type fluorescent lamp 1, FIG. 2 is a plan view of the bulb-type fluorescent lamp 1, and FIG. FIG. 4 is a front view showing the internal configuration of the bulb-type fluorescent lamp 1, and FIG. 5 is a plan view showing the internal configuration of the bulb-type fluorescent lamp 1.
In the figure, a bulb-type fluorescent lamp 1 includes a double spiral arc tube 2, a ballast 3 (lighting circuit) for lighting the arc tube 2, and a housing that houses the ballast 3 and has a base 5. 4 and an outer tube glove 6 that covers the arc tube 2.

  As shown in FIG. 3, the end of the arc tube 2 is inserted into the plate 8 and fixed to the plate 8 with an adhesive such as silicon. A ballast 3 made of various electronic components is attached to the side of the plate 8 opposite to the arc tube 2.

  A convex portion 2 a bulging the glass tube is formed at the tip of the arc tube 2 opposite to the base 5. The convex portion 2 a is in thermal contact with the lower end portion 6 a of the outer tube globe 6. The reason for providing the convex portion 2a is that by forming the convex portion 2a, the space in the convex portion 2a is separated from the trajectory of electrons flowing between the electrodes, and the temperature (cold point temperature) in the convex portion 2a further decreases. It is.

  An exhaust pipe 7 for exhausting the inside of the arc tube 2 extends from one end of the arc tube 2 to the upper part of the space in which the ballast 3 in the housing 4 is accommodated through the plate 8. The aim is to separate the tip 7a of the exhaust pipe 7 from the high temperature arc tube 2 during light emission.

Next, the operation will be described.
First, the case where the bulb-type fluorescent lamp 1 is mounted with the base 5 facing upward will be described. At this time, when the bulb-type fluorescent lamp 1 is turned on and the temperature of the arc tube 2 rises, the heat is directly transferred from the convex portion 2 a to the outer tube globe 6, and the temperature of the arc tube 2, particularly the lower end of the arc tube 2. The rise in temperature at the coldest spot that can be formed on the convex portion 2a is suppressed. Therefore, the arc tube 2 can obtain a stable output.

  Next, the case where the light bulb-type fluorescent lamp 1 is mounted with the base 5 facing down will be described. At this time, the tip 7a of the exhaust pipe 7 is separated from the arc tube 2 and extends to the vicinity of the ballast 3 having a low temperature, so that the bulb-type fluorescent lamp 1 is turned on and the temperature of the arc tube 2 is increased. However, the tip 7a of the exhaust pipe 7 has a lower temperature than other parts of the arc tube 2, and the coldest spot is formed there. And since mercury exists in the front-end | tip 7a of the exhaust pipe 7 which is the coldest point located in the lower end part of the arc_tube | light_emitting_tube 2, the mercury vapor pressure in the arc_tube 2 is determined with the temperature, and becomes an appropriate mercury vapor pressure. Stable output can be obtained.

  As described above, according to the present embodiment, both the bulb-type fluorescent lamp 1 emits light when it is mounted with the base 5 facing up and when the base 5 is mounted with the base 5 facing down. The lower end of the tube 2 (the convex portion 2a in the former case and the tip 7a of the exhaust tube 7 in the latter case) becomes the coldest point, and a stable output is always obtained.

Embodiment 2. FIG.
FIG. 6 is a front view showing a section of the bulb-type fluorescent lamp 1 according to the second embodiment.
In Embodiment 1, the convex portion 2a is brought into contact with the outer tube globe 6 and the convex portion 2a and the outer tube globe 6 are thermally coupled. However, as shown in FIG. 6, the outer tube near the convex portion 2a is used. An opening 6 b may be provided in the globe 6, and the convex portion 2 a may be cooled by air entering the outer tube globe 6 from the outside to suppress an increase in temperature at the coldest spot.

  In the present embodiment, when the bulb-type fluorescent lamp 1 is turned on and the temperature of the arc tube 2 rises, the convex portion 2a has cold air entering from the opening 6b opened in the outer tube globe 6 near the convex portion 2a. Therefore, the arc tube 2 can obtain a stable output.

  In the above description, the arc tube 2 has a double spiral shape, but is not limited thereto. Anything such as a bent shape may be used.

  The tip 7a of the exhaust pipe 7 is shown in the upper part of the space in which the ballast 3 of the housing 4 is housed. However, it may be anywhere in the space in which the ballast 3 of the housing 4 is housed.

  Moreover, as a method of cooling the convex portion 2a of the arc tube 2, a method of bringing the convex portion 2a into contact with the outer tube globe 6 and a method of opening the opening 6b in the outer tube globe 6 in the vicinity of the convex portion 2a have been shown. Other methods may be used.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1, and is a front view of the lightbulb-type fluorescent lamp 1. FIG. FIG. 3 is a diagram showing the first embodiment, and is a plan view of the light bulb-type fluorescent lamp 1. FIG. 2 is a diagram showing the first embodiment and is a front view showing a cross section of the bulb-type fluorescent lamp 1. FIG. 2 shows the first embodiment and is a front view showing an internal configuration of the light bulb-type fluorescent lamp 1. FIG. 2 is a diagram showing the first embodiment and is a plan view showing an internal configuration of the light bulb-type fluorescent lamp 1. FIG. 6 is a diagram showing the second embodiment and is a front view showing a cross section of the bulb-type fluorescent lamp 1. It is a front view which shows the cross section of the conventional light bulb-type fluorescent lamp.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Light bulb type fluorescent lamp, 2 Light emission tube, 2a Convex part, 3 Ballast, 4 Housing, 5 base, 6 Outer tube glove, 6a Lower end part, 6b Opening part, 7 Exhaust pipe, 7a Tip, 8 Plate, 15 Thermal conduction Sex medium.

Claims (1)

An arc tube, a ballast for lighting the arc tube, a plate that holds the arc tube on one side and the ballast is mounted on the other side, and contains the ballast and has a base In a bulb-type fluorescent lamp having a housing and an outer tube globe covering the arc tube, and enclosing mercury,
A convex portion that is formed at the tip of the arc tube opposite to the base, and that becomes the coldest point when the arc tube is turned on with the base facing up,
Provided to evacuate the inside of the arc tube, extending from the arc tube to the housing through the plate, and when the arc tube is turned on with the base down, the tip is the coldest point A bulb-type fluorescent lamp characterized by comprising an exhaust pipe.

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