JPS59177851A - Lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Projecting at its external neck through a 'black current supply conductor connected to
A glass one-light envelope is provided with a light source arranged thereon.
The invention relates to an electric lamp whose lamp envelope has on its inner surface an electrostatically deposited colored coating consisting of a light-scattering powder and at least one cadmium pigment. An incandescent lamp of this type is known from US Pat. No. 8,820,460.

In environments where it is necessary to avoid light attracting insects, such as festival lighting, disco lighting, etc.
Such electric lights can be used.

Electrostatically deposited powder layers have the advantage, compared to layers formed from powder suspensions, that bathing agents and binders are not introduced into the lamp envelope during deposition. fact,
This powder is dusted and cleaned dry in the lamp envelope or bulb, and the bulb wall is given a positive orientation with respect to this powder. This powder adheres to the inner wall of the bulb under its influence.

Electrostatically deposited powder layers have distinctive properties that distinguish them from layers formed from powder suspensions. The powder bed with does have a very small packing density, which is 5
It is 0 times smaller. On its surface, this layer
Compared to the smooth surface of the layer obtained from the suspension, it has a very high degree of roughness. The significant difference is further explained by the fact that when an electrostatically coated lamp envelope or bulb is viewed along a tangent to the bulb, it is clearly visible that the lamp bulb wall has a certain thickness. That's true.

On the other hand, in lamp envelopes coated with suspensions, the wall thickness of the envelope is not visible and no pitting can be detected when similarly observed.

This powder is used in such a way that the colored lamps have the same color when turned on and off, i.e. by transmitted light and projected light, respectively, while the light source is invisible to the eye and the cladding wall is evenly illuminated. A requirement (or requirement) is imposed on colored lamps that the layer scatters the light produced by the lamp. For some colorations such as red, yellow and orange, which occur with them, it has been found that cadmium compounds have to be used as pigments, especially when intense colors are required. Served.

These pigments have great tinting power, so that they strongly color electric lamps even though they are mixed with light-scattering powders. .

Cadmium compounds also have high thermal stability.

However, cadmium compounds have the disadvantage of being toxic, which is why many of these cadmium compounds must be avoided ultimately revealing themselves in the environment at the end of the lamp's life.

The object of the invention is to maintain the color properties of colored electric lamps while
It is an object of the present invention to provide a colored electric lamp in which the content of cadmium compounds is reduced compared to that in conventional colored electric lamps.

According to the invention, in an electric lamp of the kind described in the opening paragraph, it comprises: said outer jacket inner layer consisting of said colored coating or a mixture of light-scattering powder and pigment powder;
an upper surface layer consisting primarily of light-scattering powder;

In the electric lamp according to the US patent mentioned in the opening paragraph, the cladding comprises a single layer of a homogeneous powder mixture. Scatter the emitted light to a sufficient degree, up to 1°,
In order to uniformly illuminate the lamp envelope, this single layer must be relatively thick. Furthermore, in order to give the lamp envelope the same color with the projected and transmitted light, the pigment content of this layer must be relatively high.

The mixture used according to the above-mentioned US patent contains equal parts by weight of silicon dioxide and cadmium sulfide.

In the electric lamp according to the invention, a thin outer layer with a high pigment content is sufficient. The thickness of the outer layer viewed from the center of the bulb and its pigment content depend on the saturation of the color required for the colored lamp. Generally, this outer layer has an average thickness of 50-70 μm and its pigment content is 85-45% by weight. This inner layer, i.e., the inner layer relative to the center of the bulb, consists primarily of light-scattering powder and contains no or very little pigment.The average thickness of this inner layer is approximately equal to the lamp envelope. is related to the desired degree of uniformity illuminated by the light source. This inner layer generally has an average thickness of about 75-180 μm.

Compared to a lamp with the same powder of the lamp envelope, the same color and the same uniformity of illumination with a conventional electrostatically deposited coating, the lamp according to the invention contains considerably less pigment, i.e. 70% Contains small amounts of pigment.

As the light-scattering component of this coating, silicon dioxide or a mixture of various silicon dioxides is primarily utilized. This component generally has a primary particle size lying primarily between 10 and 30 nm.

Examples of cadmium compounds that can be used as pigments in this coating are sulfur, cadmium sulfide (yellow), cadmium sulfide selenide (red), mixtures of these two substances (orange), cadmium sulfide/ultramarine night ( Sodium polysulfide silicate aluminate) (green).

These pigments have a primary particle size mainly lying between 100 and 5000 nmK.

Powder mixtures can be prepared in the dry state, for example, in a "fluidized mixer". In this case, (for example, 10
A hydrophobic light-scattering material (having a resistivity of 14 Ω) and a hydrophobic light-scattering material (such as silicon dioxide)
The desired resistivity of these mixtures can be adjusted by using together with a hydrophilic light scattering material (having a resistivity of G).

In general, the frost lamp according to the invention has an I! y
The stored filament is used as a light source. However, alternatives to this are high pressure gas discharges, such as high pressure sodium vapor discharges and high pressure water scissor vapor discharges.

In operation in example 220■, 15.25.4 IO respectively
and a lamp consuming 60 W of power was manufactured using an A-60 lamp envelope, i.e. a lamp envelope having a spherical curved section with a maximum diameter of 60 mm and a nail-like section.

These lamp envelopes are constantly laminated on their inner surface by an electrostatically deposited outer layer (i.e. viewed from the interior center of the envelope) and an electrostatically deposited inner layer. Ta. This outer layer had the following composition: That is, pigment 4
0-fold spacing; Hydrophobicity 5102 20% by weight; Hydrophilicity 510
240% by weight. inside (viewed from the internal center of the valve)
The layer was composed of equal parts by weight of hydrophobic and hydrophilic 8102. The average thickness and weight of this outer and inner layer are 50 μm, 40 m9, and 120 μm, +3
It was 41n9.

These electric lamps contain cadmium sulfide, cadmium sulfide selenide coprecipitate, and cadmium sulfide/sulfide as pigments, respectively.
Produced in different colors using cadmium selenide-coprecipitate and cadmium selenide/ultramarine solution.

For comparison, 40 tons of pigment, 20*weight% of hydrophilic S
A conventional lamp was manufactured using an electrostatically deposited coating comprising a single layer of 102.40% hydrophobic 5102 by weight. On average, the thickness of this layer was 145μ and its weight was 140~.

Electric lamps according to the invention, both in operation and in non-operation, have optical properties that are indistinguishable or nearly indistinguishable from the optical properties of conventional electric lamps. However, in the lamp according to the invention, the weight of the pigment was only 28.6% of the weight of pigment in the conventional lamp.

In each case, during the application of both coating layers, the lamp outer unit was applied with a positive voltage of 12 KV (positive
given a potential.

1 shows an embodiment of an electric lamp according to the invention in a partially cutaway side view; FIG.

In this figure, a lamp envelope 1 has electrostatically applied colored coatings 2a, 2b on its inner surface. This coating consists of two layers. Its outer layer 2a, i.e. the lamp envelope 1
The layer 2a lying on the outside as seen from the inner center of the laminate consists of a mixture of a light-scattering powder and at least one cadmium pigment; the inner layer 2b consists mainly of a light-scattering powder. A filament 3 is arranged in this lamp envelope 1 as a light source.A current supply conductor 4 carries a light source 8 and projects to the outside through the vacuum-tight wall of the lamp envelope l, outside of which these The current supply conductor of is fixed to the contacts of the lamp cap 5 which is fixed to the lamp envelope 1.

In summary, the lamp according to the invention with a colored casing (1) is characterized in that the lamp casing (1), i.e. the inner surface of the lamp bulb, is coated with two electrostatically deposited powder layers. One of the layers (2a) comprises a cadmium pigment;
a light-scattering powder, and one other inner layer (
2b) mainly consists of a light-scattering powder. In order to obtain comparable optical properties, the amount of pigment in the 8-arm is significantly lower than in conventional lamps with mono-a overlays. (See drawing).

[Brief explanation of the drawing]

The drawing is a partially cutaway side view of a central example of the present invention. ]... Lamp envelope (i.e. light bulb bulb) 2a... Electrostatically applied diffused colored outer III coating 2b...
Diffuse beak-colored inner rupture 30. ．． Filament 4... Current supply conductor 5... Light cap.

Claims (1)

[Scope of Claims] 1. A glass lamp envelope is provided, which is vacuum-tight and weight-bearing, and in which a light source is arranged, which is connected to a current supply conductor that projects through the lamp envelope wall to the outside of the lamp envelope. An electric lamp having an electrostatically deposited colored coating on its inner surface consisting of a light-scattering powder and at least 1 m of cadmium pigment, wherein said colored coating consists of a mixture of a light-scattering powder and a pigment powder. An electric lamp characterized by comprising an inner surface layer and an upper surface layer mainly consisting of a powder that scatters light.