JPS6199243A - Method of forming white diffusion film for bulb - Google Patents

Abstract

PURPOSE:To improve the adhesion strength of a white diffusion film by pouring an aqueous solution containing water soluble polymer resin to form a water soluble polymer resin layer on a white pigment layer after applying white pigment in the inner surface of a glass globe. CONSTITUTION:A fluorescent lamp is formed to a U-shape or a double U-shape, and when forming a white diffusion film in the inner surface of a glass globe in an electric lamp type fluorescent lamp which is housed within the glass globe, together with a glow starter and a ballast, firstly, the mixture of calcium pyrophosphate and silica, as white pigment, is applied to the inner surface of the globe by means of an electrostatic painting method, and thereafter the solution in which hydroxypropylcellulose is dissolved into demineralized water is poured or sprayed to form a hydroxypropylcellulose layer on a white pigment layer. Accordingly, it is possible to extremely improve the film adhesion strength of a white pigment layer and to completely prevent the film falling down etc.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for forming a white diffusion film for a light bulb, and more particularly to a light bulb having a light bulb base and incorporating a non-linear fluorescent lamp with a ballast 9 lighting tube. The present invention relates to a method for forming a white diffusion film on the inner surface of an outer globe of a fluorescent lamp.

Conventional Structures and Problems Conventionally, fluorescent lamps have higher lamp efficiency than incandescent light bulbs, and they have the ability to choose from a variety of light colors. It has also been used in large quantities in ordinary households. However, the majority of fluorescent lamps are lfj eA shaped or annular in shape;
Their major drawbacks are that they are larger than light bulbs, and require a ballast and lighting tube, making the entire device larger, and they are more complicated to handle than light bulbs.

In recent years, the drawbacks of such fluorescent lamps have been solved.

In order to save energy, we decided to replace fluorescent lamps with U.
Many so-called light bulb-shaped fluorescent lamps have been proposed, which are formed into a shape or a dub/L/U shape and are integrated with a lighting tube and a ballast and housed in a glass globe. In this case, a white pigment is applied to the inner surface of the glove so that the light from the built-in fluorescent tube is uniformly diffused. The white pigment is applied by electrostatic coating using fine silica powder, which has traditionally been used in incandescent light bulbs, etc., but it has the great advantage that the entire film is thin and can be applied uniformly and at high speed. Because the interior is not vented and air exists, the moisture contained therein adheres to the inner surface of the glove during lighting, and this causes the silica applied to the inner surface of the glove by electrostatic coating to deteriorate. It has been found that those with extremely weak adhesion strength have a serious drawback in that part of the pattern falls off.

OBJECTS OF THE INVENTION The present invention provides a novel method for forming a white diffusion film for bulbs in which there is no shedding of the white (!3) pigment layer.

Structure of the Invention The present invention provides a white pigment layer by applying a white pigment to the inner surface of a glass globe using an IR peep-saw method, and then flowing or spraying an aqueous solution containing a water-soluble polymer resin into the glass globe. A water-soluble polymer resin layer is formed thereon.

DESCRIPTION OF EXAMPLES Hereinafter, examples of the present invention will be described together with comparative examples.

Examples Example 1 Cal/I/7um pyrophosphate was used as the Yamauchi pigment, and in order to improve the dispersibility and chargeability of calcium/lamb pyrophosphate, j vaginal equivalent of silica was mixed. , outer diameter 95
1.5 on the inside of a familiar spherical glass globe? Apply using electrostatic coating method. Thereafter, hydroquine propyl cellulose 57 dissolved in 100 m of deionized water was flowed or sprayed into the glass globe on which the calcium pyrophosphate was coated, and was poured onto the calcium pyrophosphate layer. Form a hydroxypropylcellulose layer on the A 10-watt double U-shaped fluorescent lamp was assembled together with a lighting tube and a ballast in a glass globe to produce a compact fluorescent lamp. Ten of these lamps were lit for 6,000 hours, but no film came off at all.

On the other hand, as a comparative example, 1 Q of compact fluorescent lamps were manufactured under the same conditions as in Example 1, except that the hydroxypropyl cellulose layer was not provided on the calcium pyrophosphate layer, and a lighting test was conducted. i of calcium pyrosinate layer after lighting for hours! The membrane was observed to come off.
1 Example 2 Calcium/rum carbonate was used as a white pigment, and silica was mixed therein to improve the dispersibility and chargeability of calcium carbonate. 2 on the inside of the spherical glass globe. o7 Apply by electrostatic coating method. After that, carboxymethyl cellulose 7? 1
oo, 711 dissolved in deionized water is flowed or sprayed into the calcium carbonate glass globe to form a carboxymethyl cellulose layer on the calcium carbonate layer. A 10 watt type Dove/L/U type fluorescent lamp was assembled in a glass globe together with a lighting tube and a ballast to produce a light bulb type fluorescent lamp. 6 of these 10 lamps
Although the lamp was lit for 000 hours, no film came off at all.

On the other hand, as an example of Comparison 11Ff, 10 bulb-shaped fluorescent wraps were made under the same conditions as in Example 2 above without forming a carboxymethyl cellulose layer on the calcium carbonate layer, and a lighting test was conducted for about 25 hours. The calcium carbonate layer was observed to have fallen off in all lamps after lighting.

As described in detail, the present invention involves applying a white pigment to the inner surface of a glass globe using an electrostatic coating method, and then applying an aqueous solution containing a water-soluble polymer resin. By flowing into the globe, the adhesion strength of the white pigment layer applied by the electrostatic coating method can be greatly improved, and it is possible to provide a method for forming a white diffusion film for a tube without any film shedding. It is.

Claims (1)

[Claims] After applying a white pigment to the inner surface of the glass globe using an electrostatic coating method, an aqueous solution containing a water-soluble polymer resin is flowed or sprayed into the glass globe to coat the water-soluble polymer resin onto the white pigment layer. A method for forming a white diffusion film for a tube, characterized by forming a layer.