JPH06119910A - Fluorescent light - Google Patents

Abstract

(57) [Abstract] [Purpose] To secure the safety when incorporating a small-diameter fluorescent lamp in a device and to prevent the lead wire from breaking when the external electric wire is routed. [Structure] The lead portion 113 of the fluorescent lamp is bent toward the center along the glass tube wall, and the glass tube end portion and the caulking portion 11 are formed.
4 is covered with a protective member 110.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp, and more particularly to improvement of an end portion of a small-diameter fluorescent lamp having a diameter of 8 mm.

[0002]

2. Description of the Related Art Conventionally, in fluorescent lamps, filament portions for emitting thermoelectrons are located at both ends of a long glass tube.
Since the filament portion and the inner portion of the glass tube are so-called Faraday dark portions and do not contribute to light emission, the length of the glass tube is the required effective light emission length + the length of the Faraday dark portion. Furthermore, since the fluorescent lamp has a base portion for supplying electric power to the filament, the fluorescent lamp has a large amount of excess in the longitudinal direction compared to other light sources, which obstructs the depth direction of the device. Therefore, there is a proposal to reduce the length of the base portion as much as possible, and a fluorescent lamp having contacts on both sides of the base and a socket dedicated thereto are also in practical use.
At present, they are used in fluorescent lamps having a diameter of 16 [mm].

However, in recent years, due to a demand for further miniaturization and thinning of the apparatus, the diameter of the pipe is smaller, for example, [8 m].
m] small diameter fluorescent lamps have been put to practical use. In this small-diameter fluorescent lamp, by providing a base portion that is used in a conventional fluorescent lamp with a diameter of 16 [mm], the diameter of the base is made substantially the same as the diameter of the glass tube 8 [mm]. It is necessary to use a conventional assembly jig or the like. Further, it is not practical to make only the mouthpiece as large as a conventional one because it is contrary to the purpose of downsizing the device by using a pipe having a diameter of 8 mm. Therefore, in the case of a fluorescent lamp of this class, the lead wire of the filament part is directly led out of the glass tube,
The tip portion is crimp-connected with the conductor of the external electric wire by crimping or the like.

FIG. 3 shows a conventional example of such a small diameter fluorescent lamp.

In FIG. 3, the filament 1 is provided at both ends of the fluorescent lamp 101 (numbers in the figure mainly indicate one side).
02 and the external electric wire 10 for supplying an electric current to 02.
5 is crimped and connected at the crimp portion 104.

[0006] Electrically, in this state, after connecting to a lighting device (not shown) to preheat the filament 102 by energization to emit thermoelectrons, a predetermined voltage is applied to the filament electrode portions on both sides to start discharge. The fluorescent light emits light.

[0007]

However, in the above-mentioned conventional example, it is not necessary for the lead portion 103 at the time of assembling such a fluorescent lamp into a predetermined optical device or at the time of carrying out the routing processing of the external electric wire 105. Stressful,
There is a drawback that the lead portion 103 is broken.
Further, both ends of the fluorescent lamp 101 have protrusions 106 due to the manufacturing reason of the glass tube, but it is also sufficient that stress is applied to the protrusions during the process of handling such as transportation and installation in a device. It was predicted that there was a drawback that the glass would be defective during lighting due to cracks or the like.

[0008]

In order to solve the above problems, the present invention is directed to a glass tube, a filament portion provided at an end of the glass tube, and a lead led out of the glass tube from the filament portion. In a fluorescent lamp having a lead portion and an external electric wire connected by crimp connection, the lead portion is bent in the central direction along the glass tube, and is bent with the glass tube end portion. In addition, a protective member is provided to cover the entire crimp connection portion of the lead portion.

[0009]

FIG. 1 shows an embodiment of the present invention. The fluorescent lamp main body 100 is shown with a 90 ° angle different from that of the conventional example 3.

In this embodiment, the lead portion 113 and the external electric wire 115 are crimped and connected by the crimping 114, which is a crimping connection portion, and then the two lead portions are kept parallel to each other while maintaining the central portion (longitudinal direction) (In) and bent along the glass tube wall. In this state, by pushing the rubber-made cylindrical protection member 110, which is an elastic body, from the outside, at both ends of the fluorescent lamp 100, the glass tube end portion, the lead portion 113, the crimp portion 114, and a part of the external electric wire 115. Are covered and protected.

The protective member 110 has an inner diameter substantially equal to the inner diameter of the fluorescent lamp, and the lead portion, the crimp portion and the external electric wire have a shape in consideration of the margin. There is.

The caulking portion 114 is configured to be pressed against the glass tube wall by the elasticity of the protective member 110.

FIG. 2 is a view of the protection member 110 viewed from an angle. In this protection member, a wall portion 111 is formed inside so that the two lead portions do not contact each other.

As described above, in this embodiment, since the caulking portion is pressed against the glass tube wall by the elastic force of the protective member and is held, stress is not transmitted to the lead portion even if the external electric wire is drawn around in the apparatus. It is possible to prevent disconnection of the lead portion.

Further, since the protective member covers the entire end of the glass tube, the lead portion is caught in the apparatus even when the fluorescent lamp is incorporated into the apparatus, and the glass tube end is produced during manufacturing. It is possible to safely incorporate the fluorescent lamp into the device without the projections colliding with other parts and causing cracks or the like.

In this embodiment, the caulking portion is pressed against the fluorescent lamp tube wall by the protective member, but the inner shape of the protective member is changed so that the lead member and the external electric wire are also pressed by the protective member. With this configuration, it is more advantageous for routing the external electric wire.

[0017]

As described above, according to the present invention, since the protective member is provided at the end of the fluorescent lamp, the fluorescent lamp can be safely incorporated in the apparatus, and the external electric wire can be routed. Is also advantageous.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fluorescent lamp that is an embodiment of the present invention.

FIG. 2 is a perspective view of a protection member used in the fluorescent lamp of FIG.

FIG. 3 is a sectional view of a conventional fluorescent lamp.

[Explanation of symbols]

 100 Fluorescent lamp 110 Protective member 112 Filament 113 Lead part 114 Caulking part 115 External electric wire

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Yoshio Mizuno, 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor, Satoru Kanno 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Within the corporation

Claims (2)

[Claims] 1. A glass tube, a filament portion provided at an end portion of the glass tube, and a lead portion led out of the glass tube from the filament portion. The lead portion and an external electric wire are provided. In the fluorescent lamp connected by crimp connection, the lead portion is bent in the center direction along the glass tube, and a protective member for covering the entire crimp connection portion of the lead portion bent with the glass tube end portion is provided. A fluorescent lamp characterized by being provided. 2. The fluorescent lamp according to claim 1, wherein the protective member is an elastic body.