JPH0443973Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an incandescent light bulb with a ceramic base.

[Prior art and its problems]

In incandescent light bulbs with a relatively high output for use in stage or studio lighting, a ceramic base with a pair of protruding base pins is attached to a crimp seal at one end of the incandescent light bulb. Here, the vertical and tilting positional relationships between the ceramic base and the incandescent bulb are important, and must be installed accurately. This ceramic base has a bottomed cylindrical shape with a rectangular hole that receives the crimp seal, and the crimp seal inserted into this hole is fixed with an adhesive. If you fill all the gaps with the adhesive, the amount of filling will be large and it will take time to dry and solidify, during which time it will be necessary to hold the incandescent bulb in some way, and furthermore, the adhesive will There is a risk that external lead wires exposed inside the hole may be shot. For this reason, conventionally, first, powder made of silica sand or quartz sand or fibrous ceramic wool was filled, the vertical positional relationship and inclination of the ceramic base and the incandescent bulb were finely adjusted, and then the incandescent lamp was placed on top of the ceramic base. It was fixed with adhesive.

However, when fine sand such as quartz sand is filled, the amount of filling is large and the sand is packed so densely that the sand hardly flows, making it very difficult to finely adjust the inclination. In addition, fibrous ceramic wool is
Due to the high elasticity when filled, it is almost impossible to make fine adjustments after filling.For this reason, fine adjustments must be made while filling small amounts, making the filling process very time-consuming. Was.

[Purpose of invention]

Therefore, the present invention has been developed to create an incandescent light bulb with a base that is easy to fill and fine-tune, can reliably hold the crimp sealing part in an accurate positional relationship, requires less adhesive, and has excellent insulation resistance. The purpose is to provide

[Structure of the device and its function]

The incandescent light bulb with a base of the present invention consists of an incandescent light bulb with a flat crimp-sealed portion formed on one end of the envelope, and a bottomed cylindrical ceramic base having a rectangular hole for receiving the crimp-sealed portion. In the hole of the ceramic base, there is a ceramic wool plate in which ceramic wool fibers are formed into a plate shape to hold both wide sides of the crimp sealing part, and silica sand or quartz filled in the upper part of this ceramic wool plate. It is characterized by consisting of a powder layer made of sand and an adhesive layer filled on top of this powder layer.

In other words, a ceramic wool plate formed by forming ceramic wool fibers into a plate shape has flexibility, but since it is plate-shaped, it is very easy to fill.
Further, fine adjustment of the vertical positional relationship can be easily performed. Since the wide surface of the crimp-sealed portion is held under pressure, it can be held securely.
In addition, since it is flexible, if the inclination is finely adjusted before filling with the powder layer and then the powder layer is filled, it will be fixed by the powder layer and the inclination direction will be accurate. Furthermore, since the adhesive layer is filled on top of the powder layer, the amount of adhesive is small, there is no risk of external lead wires exposed in the holes being shot due to the adhesive, and the insulation resistance is excellent. ing.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

Figure 1 shows a cross-sectional view of an incandescent light bulb with a base, rated at 2KW, used for stage and studio lighting. On one end side of the envelope 11 of the incandescent light bulb 1, a flat crimp-sealing part 12 is formed by pitch-sealing, and a pair of molybdenum foils 1 are attached to this crimp-sealing part 12.
3 are buried. One end of a pair of internal leads 14 is each welded to a molybdenum foil 13 and extends into the enclosure 11, and a filament 15 is installed between the internal leads 14. One end of each external lead 16 is welded to the molybdenum foil 13 and extends from the crimp sealing part 12, and a lead wire 17 made of a twisted wire is welded to the external lead 16.

The ceramic base 2 is a bottomed cylindrical body having a rectangular hole 21, and a pair of base pins 22 protrude from the bottom surface. A crimp sealing part 12 is inserted into this hole 21 and fixed with a ceramic wool plate 3, a powder layer 4, and an adhesive layer 5, and the ceramic base 2 is attached to the incandescent light bulb 1. The lead wire 17 is also inserted into the base pin 22 and welded.

Here, to explain the method of fixing the crimp sealing part 12 in the hole 21, first, ceramic wool plates 3 are inserted in a press-fit state into both sides of the wide surface of the crimp sealing part 12. It can be easily inserted. This ceramic wool board 3
is made by molding ceramic wool fibers into a plate shape with a thickness of about 4 mm, and has flexibility.
2 is held under pressure. However, in this state, the crimp sealing part 12 can be moved in the vertical direction, and the vertical positional relationship can be finely adjusted. and,
The direction of inclination is also finely adjusted, but since the ceramic wool plate 3 is flexible, when the incandescent light bulb 1 is tilted, the ceramic wool plate 3 will move as shown in FIG.
is elastically deformed, and the incandescent bulb 1 and ceramic base 2
The normal positional relationship can be easily determined.
In this state, when the ceramic wool plate 3 is filled with fine powder made of silica sand or quartz sand to form a powder layer 4, the pressure sealing portion 12 is attached to the powder layer 4.
In particular, since fine powder can be packed tightly, it hardly flows and the direction of inclination is firmly fixed. When the powder layer 4 is filled with an adhesive and the adhesive layer 4 is adhesively fixed, the pressure sealing part 12 can be reliably fixed in the hole 21 in an accurate positional relationship with a small amount of adhesive. Further, since this adhesive is blocked by the powder layer 4 and the like and does not flow downward and does not adhere to the lead wires 17 and the like, there is no risk of it being shot.

[Effect of idea]

As explained above, in the incandescent light bulb with a base of the present invention, both wide sides of the crimp-sealed portion of the incandescent light bulb are held in the hole of the ceramic base by ceramic wool plates, and the upper part of the ceramic wool plate is Since the powder layer is filled with a powder layer and the adhesive layer is filled on top of this powder layer, these filling operations and fine adjustment of the positional relationship between the incandescent bulb and the ceramic base are easy. An incandescent light bulb with a base that can be reliably held in an accurate positional relationship, requires a small amount of adhesive, and has excellent insulation resistance.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main parts. DESCRIPTION OF SYMBOLS 1... Incandescent light bulb, 11... Encapsulation body, 12... Crimp sealing part, 15... Filament, 2... Ceramic base, 21... Hole, 3... Ceramic wool board, 4... Powder layer, 5...Adhesive layer.

Claims (1)

[Scope of utility model registration request] An incandescent light bulb having a flat crimp-sealed portion formed on one end side of the envelope, a bottomed cylindrical ceramic base having a rectangular hole for receiving the crimp-sealed portion, and a ceramic base in the hole of the ceramic base. , a ceramic wool plate in which ceramic wool fibers are formed into a plate shape to hold both sides of the wide width of the crimp sealing part, and a powder layer made of silica sand or quartz sand filled in the upper part of the ceramic wool plate. An incandescent light bulb with a base, comprising: an adhesive layer filled on top of the powder layer.