JPH0714413A - Illumination device and electric-bulb type fluorescent lamp - Google Patents

Abstract

PURPOSE:To provide an illumination device and an electric-bulb type fluorescent lamp which have less deterioration in the luminous efficiency and the external appearance even after a long lapse. CONSTITUTION:A coating film 9 made of a transparent resin is formed at least on the inner surface of a transparent outer grass bulb 6 or a glass globe having a light source lamp 1 accommodated therein. The transparent resinous coating that clads the inner surface of the outside glass bulb or glass globe of a double glass-bulb structure protects the glass surface to prevent the fogging of the surface of the glass due to precipitation of the sodium component of the glass on the surface of the glass by the effect of humidity in the atmosphere and the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double glass bulb type lamp or a lighting device having the lamp mounted in a glass globe.

[0002]

2. Description of the Related Art For example, a fluorescent lamp is generally used as an incandescent lamp for fluorescent lamps because it has excellent light efficiency, can be used with low electric power, and has a long life compared with general incandescent lamps.
A 26-inch screw-type base is installed, and lighting circuit parts such as a ballast are incorporated, and it is compatible with an incandescent light bulb that can be installed in an existing socket and lighted. Lamps are being commercialized.

In this bulb-type fluorescent lamp equipped with an E26 type base, a tube-shaped glass bulb having discharge electrodes sealed at both ends is bent into a substantially U-shape, or the U-shaped bulb is curved again into a substantially U-shape. As a so-called saddle-shaped curved tube type bulb that is made as compact as possible to form a fluorescent lamp as a light source, the fluorescent lamp and lighting circuit parts are housed in an envelope constituted by a cover member and an outer bulb. A screw-type base is attached to the envelope so that it can be attached to a socket for an incandescent light bulb.

Conventionally, as a material for forming the outer bulb which emits light at the time of lighting, synthetic resin is often used from the viewpoint of cost and moldability, but synthetic resin is poor in solidity and its light transmittance is glass. In addition to being lower than the above, there is a problem that not only the discoloration with time occurs and the luminous efficiency is lowered but also the appearance is inferior due to this discoloration.

Therefore, a lamp has been commercialized in which the outer bulb is made of glass, which is heavy and has a high-grade feeling and has a high light transmittance. Even when the outer bulb is made of glass such as soda lime, not limited to the synthetic resin,
Although the inner valve and the outer valve are integrally fixed so as not to be separated from each other, they are not airtight, and the space is in communication with the atmosphere.

The lamp is attached to a socket or a fixture and used for a long period of time, but its state and conditions are various, and a phenomenon called weathering is observed on the surface of a glass bulb which has a low weather resistance over time. Occurs.

In this weathering phenomenon, sodium in the glass component is deposited due to the influence of water vapor in the air, causing a change on the glass surface to give "cloudiness". This phenomenon is particularly caused by the temperature rising and falling by repeated blinking of the lamp. It gradually occurs with the lighting on the surface of the outer glass bulb.

This "fogging" phenomenon occurs on the inner surface side of a transparent valve. This is because the inside of the valve is in the form of a blind alley, the ventilation is poor and the atmosphere tends to be trapped, and minute moisture due to humidity in the atmosphere is generated. It is presumed that many of them remain. This phenomenon also occurs to some extent on the outer surface of the valve, but the outer surface is gently cleaned by daily cleaning, and the outer surface can be easily wiped off. Probably because it can maintain cleanliness, it is extremely mild even if it occurs. It should be noted that this "fogging" phenomenon is not noticeable or often does not feel when the bulb is light-scattered, colored or decorated.

To prevent this "fogging", it may be possible to wipe the outer surface of the bulb as often as it is done on the outer surface of the bulb. However, the outer glass bulb should be removed because it is firmly fixed with adhesive or screws. Even if you can remove it, you cannot put your hands or tools into the inner surface. Further, although it is possible to hermetically seal the outer glass bulb, supporting and fixing of the inner lamp, sealing means, and the like are complicated, and the equipment becomes large-scale and expensive.

This problem can also be said in a lighting fixture such as a front light in which a lamp is housed in a transparent glass globe having a shape such as a ball or a prism.
Even when it is desired to obtain radiant light that is glittering, the gloves become cloudy over time, and the appearance becomes inferior and dirty, which is also not a preferable state.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned problems and provide a lighting device and a bulb-type fluorescent lamp which are less visually deteriorated over time.

[0012]

In a lighting device according to a first aspect of the present invention, a coating made of a transparent resin is formed on the inner surface of a transparent outer glass bulb or glass globe accommodating a lamp for a light source. It is characterized by that.

The illumination device according to a second aspect of the present invention is characterized in that a transparent outer glass bulb or a glass globe accommodating a lamp for a light source is provided with a coating made of a transparent resin on the inner and outer surfaces thereof. .

An illumination device according to a third aspect of the present invention is characterized in that the light source lamp is a fluorescent lamp.

According to a fourth aspect of the present invention, the transparent resin material is urethane resin.

A compact fluorescent lamp according to a fifth aspect of the present invention is a fluorescent lamp and a lighting circuit for the fluorescent lamp.
It is characterized by comprising an envelope containing these fluorescent lamps and a lighting circuit, and the envelope is characterized by having an outer glass bulb having a coating made of transparent resin formed on at least the inner surface side.

[0017]

[Function] The transparent resin coating covering the outer surface of the double glass bulb or the inner surface of the glass globe protects the glass surface, and sodium in the glass component precipitates due to the influence of moisture in the atmosphere and the surface becomes cloudy. Prevent.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a bulb-type fluorescent lamp 10. In FIG. 1, reference numeral 1 denotes a saddle-shaped fluorescent lamp in which a glass tube bulb 2 is bent in a U shape twice, and electrodes (not shown) are sealed at both ends of the bulb 2. In addition, a phosphor coating (not shown) is formed on the inner surface. 3 is a bulb 2 of the fluorescent lamp 1
A lighting circuit component (not shown) including the ballast 4 is attached by a holder for holding the ballast 4. 5 is the above holder 3
, A cover made of a non-translucent synthetic resin in which a plurality of vent holes 5A, 5A ... Is formed, and the fluorescent lamp 1 is bonded to the opening of the cover 5 via a silicone adhesive 7A. The outer bulb 8 is made of soda lime glass and has a substantially spherical shape that covers the above. The outer bulb is a transparent and colorless (clear) bulb.

Further, 9 is a transparent resin coating made of, for example, urethane resin applied to the inner surface of the outer glass bulb 6, and 11 is a base.

The holder 3 is a cylindrical fixing portion 3
The end 2A of the bulb 2 is inserted into A, and the fluorescent lamp 1 is held by being fixed by an adhesive 7B. Also, ballast 4
Is mounted in the mounting frame, and the support arm 3B is located above.
It has a protrusion (not shown) for attaching the base, which is formed by engraving a screw portion on the outside through.

When the lamp 10 having such a structure is attached to a lighting fixture in a general home and is energized, a predetermined light is emitted from the outer glass bulb 6 portion for ordinary lighting. At this time, the transparent resin film 9 formed on the inner surface of the outer glass bulb 6 transmits and radiates the light from the internal fluorescent lamp 1 without loss, and shows substantially the same luminous flux regardless of the presence or absence of the film 9.

Further, even if this lamp 10 is attached to a lighting fixture for a long period of time and the temperature rise and fall due to blinking is repeated violently and invisible water such as moisture adheres to the inner surface of the outer glass bulb 6, Since this moisture is on the transparent resin film 9 formed on the inner surface of the outer glass bulb 6, it does not affect the glass surface, and the weathering phenomenon that causes "cloudy" does not occur on the glass surface of the outer glass bulb 6, It does not reduce the luminous efficiency or deteriorate the appearance. In addition, the transparent resin coating 9 made of the urethane resin is not deteriorated by discoloration or the like even if moisture adheres or the ultraviolet rays from the lamp 10 or the like are received for a long period of time.

The urethane resin forming the transparent resin film 9 can be easily dispersed in water and has good workability.
In addition, since the working environment can be improved, the film can be easily formed. Further, since the urethane resin film 9 has high elasticity and spreadability, the film 9 is peeled off from the glass surface due to the temperature difference caused by the blinking of the lamp 10. Nothing.

Incidentally, the transparent resin film 9 is formed by coating the inner surface of the outer glass bulb 6 with an emulsion (for example, Watersol AT-16, trade name of Dainippon Ink and Chemicals, Inc.) in which urethane resin is dispersed in water. To do.
Next, the coating film on the inner surface of the outer glass bulb 6 is dried, and then the bulb 6 is heated at about 130 ° C. for about 10 minutes to form the coating film 9. At this time, the thickness of the coating film 9 may be about 50 to 150 μm. Here, when thinning the film thickness, a commercially available emulsion is diluted with water, and when thickening, it is applied as it is.

FIG. 2 shows another embodiment of the present invention,
The same parts as those in the embodiment of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In the above embodiment, the outer glass bulb 6 is used.
Is joined by the adhesive 7A and cannot be separated unless it is broken, whereas the one in this embodiment is separable (attached and detached) by screws.

This embodiment is a luminaire 20 equipped with an annular fluorescent lamp 1 used for a ceiling light or the like.
Reference numeral 1 is a ceiling, 22 is a board that also serves as a decorative plate attached to the ceiling 21, 23 is a base that houses a lighting device such as a ballast (not shown), and 26 is a colorless transparent (clear) soda lime glass. ) Is attached to the base plate 22 with a globe having a circular container shape. The globe 26 is formed with a recess 26A projecting inward at the periphery near the opening, and four screws 24 (only three are visible in FIG. 2) provided around the substrate 22 are screwed into the recess 26A. Is supported by.

A geometric pattern is engraved on the inner surface of the globe 26, and the transparent resin film 9 is formed on the inner surface of the globe 26 as in the above-described embodiment. Reference numeral 25 is a holder for supporting the annular fluorescent lamp 1.

When the luminaire 20 having such a structure is turned on, the light from the fluorescent lamp 1 shines in the geometric pattern portion formed on the globe 26, and the emitted light passes through the globe 26 and goes out of the luminaire 20. Is irradiated.

Since the device 20 is not airtight between the substrate 22 and the opening of the globe 26,
The outside air is constantly flowing in, creating an atmosphere containing water,
Since the transparent resin coating 9 is formed on the inner surface, weathering does not occur on the inner surface of the globe 26 even after a lapse of time. Therefore, this luminaire 20 is also free from light loss due to the formation of the transparent resin film 9 and discoloration of the globe 26, and can obtain highly efficient light emission for a long period of time and an appearance similar to that of a new article.

The present invention is not limited to the above embodiment. For example, the transparent resin material that covers the inner surface of the outer bulb or the globe is not limited to the urethane resin, and may be an acrylic resin, vinyl acetate, ethylene vinyl acetate copolymer resin, etc. Any resin having high water resistance and high UV resistance may be used.

In the above embodiment, the transparent resin coating is formed only on the inner surface of the outer glass bulb or the globe, but the transparent resin coating may be formed not only on the inner surface but also on the outer surface, and may be formed on the outer surface. In such a case, when the outer glass bulb or the globe is cracked due to some cause such as impact or damage to the light source lamp, the outer coating film has a function of preventing the glass from dropping or scattering. In particular, among the above resins, the urethane resin coating film has high elasticity and spreadability, and is effective in preventing scattering.

Further, in the above embodiment, the light source lamp housed in the outer glass bulb or the globe is the fluorescent lamp, but the present invention is not limited to the fluorescent lamp, and other light source lamps may be used. It is not limited to saddle shape or ring shape.

Further, the shape of the outer glass bulb or globe to which the present invention is applied is not limited to that of the embodiment, and may be a cylindrical shape or a rectangular tube shape of which both ends are closed during use. The present invention is not limited to colorless and transparent (clear) materials, and can be colored and transparent materials.

Furthermore, in the present invention, the fluorescent lamps and the lighting fixtures are collectively referred to as a lighting device.

[0035]

As described above in detail, according to the present invention, a protective coating is provided on the surface of an envelope such as a glass valve or glove which is difficult to clean due to a narrow entrance or a high place. It can be formed to prevent the occurrence of "clouding" called weathering and to keep the transparency high for a long period of time, emitting light with high efficiency for a long time without losing the light from the light source lamp and as good as new. It is possible to provide a lighting device capable of maintaining the appearance of the.

[Brief description of drawings]

FIG. 1 is a partially sectional front view showing a bulb-type fluorescent lamp of an embodiment of the present invention.

FIG. 2 is a partial cross-sectional front view showing a lighting fixture of an embodiment of the present invention.

[Explanation of symbols]

 10: Light bulb type fluorescent lamp 1: Fluorescent lamp 2: Glass tube bulb 6: Outside glass bulb 8: Enclosure 9: Transparent resin coating 20: Lighting equipment 26: Glass globe

Claims (5)

[Claims] 1. A lighting device comprising a transparent outer glass bulb or a glass globe accommodating a lamp for a light source, and a coating made of a transparent resin formed on the inner surface of the glass bulb. 2. A lighting device comprising a transparent outer glass bulb or a glass globe accommodating a lamp for a light source, and a coating made of a transparent resin formed on the inner and outer surfaces thereof. 3. The lighting device according to claim 1, wherein the light source lamp is a fluorescent lamp. 4. The lighting device according to claim 1, wherein the transparent resin material is urethane resin. 5. A fluorescent lamp and a lighting circuit for the fluorescent lamp, and an envelope containing the fluorescent lamp and the lighting circuit. The envelope has a coating made of a transparent resin formed at least on the inner surface side. A bulb-type fluorescent lamp having an outer glass bulb.