JPS6328859Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a light bulb device.

For example, in a document illumination device such as an electrophotographic copying machine, the light emitting part of the light source bulb is always required to be precisely placed at a predetermined position so that the document table is illuminated with a predetermined light distribution pattern. .

Conventionally, light bulb devices used for such purposes include:
For example, as shown in FIG.
A light bulb device is known in which a light bulb L is held by pressing a power supply blade E into power supply terminal 31 with its elastic force, but in this device, when a shock such as vibration is applied, the light bulb L may rotate around the power supply terminal 31. However, the light emitting filament 2 of the light bulb L is not necessarily arranged strictly on the axis of the envelope 1, and therefore, when the light bulb L rotates, the light emitting filament 2 is displaced to obtain a predetermined light distribution pattern. There was a problem that I couldn't do it.

A light bulb device shown in FIG. 2 is known as a light bulb device designed to solve this problem. In this device, a concave groove 33 is formed in the end face of the base portion 3, and the claw portion S1 of the support blade S is fitted into the concave groove 33, thereby preventing the light bulb L from rotating. However, it has been found that the apparatus having such a structure has the disadvantage that it has a short service life because many accidents occur in which the sealing portion 11 cracks.

The present invention was developed based on the above circumstances, has a simple structure, can prevent the light bulb from rotating, can hold the light emitting filament in the desired position with high precision, and can be sealed. The purpose of the invention is to provide a light bulb device that has a long service life and does not cause cracks in the parts, and is characterized by an incandescent light bulb comprising a tube-shaped envelope and a light-emitting filament disposed within the envelope. and is fixed with adhesive to the crimp sealing part of the incandescent bulb envelope,
a cylindrical ceramic base having a groove extending in the axial direction on its outer peripheral surface; a power supply terminal surrounded by the base and electrically connected to the light emitting filament; a power supply blade press-contacted to the power supply terminal; and a metal blade inserted into a groove in the base.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

3 and 4 show an embodiment of the present invention, in which a tube-shaped enclosure 1 and this enclosure 1 are shown.
An incandescent light bulb L is constituted by the light emitting filament 2 disposed inside, and the crimp sealing portions 11 at both ends of the envelope 1
(Only one side is shown)
and an external lead wire 23 electrically connected to the light emitting filament 2 via a conductive metal foil 22
One end is protruding. The tip of this external lead wire 23 is connected to a power supply terminal 31 that has a conical recess 31a formed in its outer end surface, and a cylindrical ceramic base 32 surrounds this power supply terminal 31 and the protrusion of the external lead wire 23. It is provided so as to be in contact with the end surface of the sealing part 11, and is fixed with a heat-resistant adhesive 34. A groove 32a extending in the axial direction is formed on the outer peripheral surface of the base 32.

E is a power supply blade for supplying power to the power supply terminal 31, and is made of an elastic plate. Its base end is screwed to a frame or the like (not shown), and the contact piece E1 at the tip is connected to the power supply blade E. It is pressed against the recess 31a of the power supply terminal 31 by its elastic force.

M is a metal blade whose base end is fixed to the power supply blade E with a screw or the like, and the engagement piece M1 at the tip is engaged over the entire length of the groove 32a of the base 32 by the elastic force of the metal blade M. It has been inserted. E2, E3 and M2 are screw holes.

According to the above configuration, the contact piece E1 of the power supply blade E is brought into contact with the recess 31a of the power supply terminal 31, and the elastic force of the power supply blade E is applied to the power supply terminal 31.
Since the pressing force acts on the bulb L, the vertical and horizontal displacement of the light bulb L is restricted, and the groove 3 of the base 32
Since the engagement piece M1 of the metal blade M is inserted into 2a, the rotation of the light bulb L is regulated, and as a result, the light bulb L is securely held and does not shift due to vibration etc., so that it does not emit light. The filament can always be maintained at the desired position with high precision. The engagement piece M1 of the metal blade M is inserted into a groove 32a extending in the axial direction on the outer circumferential surface of the base 32, and since the groove 32a is formed on the outer circumferential surface of the base 32, the length can be increased. Since it can be extended to a position close to the sealing part 11, it is possible to radiate heat from the vicinity of the sealing part 11 through the metal blade M with high efficiency, and therefore, the heat of the sealing part 11 can be radiated with high efficiency. Overheating can be prevented, and as a result, the occurrence of cracks in the sealing part 11 or the breaking of the metal foil 22 can be prevented, resulting in a long service life.

In the illustrated example, the base 32 is fixed in contact with the end surface of the sealing part 11, and since the sealing part 11 is not covered by the base 32, no heat is accumulated. Also sealing part 1
1 is preferable because it does not become high temperature.

Although one embodiment of the present invention has been described above, the present invention is not limited to this. For example, various changes can be made to the shapes and supporting methods of the power supply blade and the metal blade.

As explained above, the light bulb device of the present invention includes an incandescent light bulb comprising a tube-shaped envelope and a light-emitting filament disposed inside the envelope, and is fixed to the crimp-sealed portion of the incandescent bulb envelope with an adhesive. a cylindrical ceramic base having a groove extending in the axial direction on its outer peripheral surface; a power supply terminal surrounded by the base and electrically connected to the light emitting filament; and a power supply terminal that is pressed into contact with the power supply terminal. Since the structure is characterized by having a power supply blade and a metal blade inserted into the groove of the base, it has a simple structure, prevents the rotation of the light bulb, and allows the light emitting filament to be placed in the desired position. It is possible to provide a light bulb device that can be held with precision and has a long service life because no cracks occur in the sealing portion.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory perspective views showing essential parts of a conventional light bulb device, and FIGS. 3 and 4 are explanatory perspective views showing essential parts of an embodiment of the present invention, respectively. FIG. L... Light bulb, 1... Encapsulation, 11... Sealing part, 2
...Light-emitting filament, 21...Internal lead wire,
22... Metal foil, 23... External lead wire, 3...
Base part, 31... Power supply terminal, 31a... Recessed part, 3
2...Base, 32a...Groove, 34...Adhesive,
E...Power supply blade, E1...Contact piece, M...Metal blade, M1...Engagement piece.

Claims (1)

[Scope of utility model registration request] An incandescent light bulb comprising a tube-shaped envelope and a light-emitting filament disposed within the envelope, and a crimped and sealed part of the incandescent bulb's envelope, which is fixed with an adhesive, and has an axial direction on its outer circumferential surface. A cylindrical ceramic base having an extending groove, a power supply terminal surrounded by the base and electrically connected to the light emitting filament, a power supply blade press-contacted to the power supply terminal, and a power supply blade inserted into the groove of the base. A light bulb device comprising: a metal blade;