SU1436149A1 - Incandescent lamp - Google Patents

Abstract

The invention relates to electrical engineering and can be used in the manufacture of incandescent lamps from to: - Coatings on the bulb reflecting infrared: radiation. The aim of the invention is to increase: the light output of the lamp. The current passing through the heat body heats it up. Visible radiation passes through the coating on the flask, and infrared radiation is imparted to the filament body. The coating is made of a layer of metal surrounded by layers of a dielectric. The optical thickness of at least one of the dielectric layers is chosen to be 0.56-0.65 wavelength, corresponding to a maximum of the light transmission intensity. As a result, the proportion of energy returned to the incandescent body increases due to a faster increase in the reflection coefficient in the near infrared region of the spectrum, which leads to an increase in the light output of the lanpa. 2 Il, 2 tab. ha Sg

Description

The invention relates to electro-texHHKe and can be used in the manufacture of incandescent bulbs with pores on the bulb reflecting infrared radiation.

The aim of the invention is to increase the light output of the lamp.

Fig. 1 shows the design of the lamp; in FIG. 2, node I on. jg u, 1.

Table 1 shows the dependence of color recoil on the thickness of two layers of titanium dioxide, Tables 2 shows the thickness of one layer of tse ri dioxide.

I The lamp consists of an optically projected bulb 1, having a heat-reflecting coating 2 on the inner surface, a basement part 3, an electrode of 20 genes 4, supplying an operating voltage to the body 5, the heat-reflecting coating consists of dielectric layers 6 and 7 which enclose | a layer of metal 8, At least one of the layers 25 17 or 8 has a geometrical thickness | (h) 9 or 10, corresponding to an optical thickness of 0.56-0.65 of the wavelength with a maximum transmittance | of light. The thickness of the layer (metal: for example, silver is in the range of 13–28 nm. A substance having a high (1.9 or more) refractive index can be used as the material of the dielectric layers: TiO, .CEO, ZnS, The thickness of at least one of the layers of these materials is 146-171 nm. The second layer may also have tolptine 146-171 nm or 13-28 nm, .Q

A working voltage is applied through the base part 3 to the electrodes 4, the current flowing through the heating body 5 heats it up and it emits visible and infrared radiation, g The visible radiation passes through the coating 2, the infrared radiation is reflected by this coating, enters body 5 is hot. and significant part; . this radiation is absorbed by him. By: How much to infrared radiation50

Q

g

0

Up to 90% of the emitted energy comes from, the absorbed part of the radiation ensures that the body reaches 5 operating temperature at a lower input power. This proportion in a lamp of this design reaches 40%, and the transmittance of visible radiation is 90%. It follows from this that it is important to ensure, in addition to reflecting infrared radiation, good transmission of visible radiation. This combination provides the coating with the thickness of the dielectric in Tables 1 and 2,

N. Im im. Incandescent lamp, including a flask SH-61, base E-32, body incandescent 80 W, voltage 36 V made of tungsten wire by means of bispiraly. A heat-reflecting coating is deposited on the inner surface of the flask, consisting of alternating layers of dielectric, in particular TiO, between which a silver layer is placed, the corresponding thickness of the layers and the luminous efficiency of the lamp are given in tabl, the optical thickness is taken relative to the wavelength nm,

These data allow us to conclude that the increase in the light output of the incandescent lamp is achieved by increasing the fraction of the energy returned to the incandescent body in the near infrared wavelength range (700-1000 mm), where the energy density of the radiation is close to the maximum.

An increase in the fraction of energy returned to the filament body is achieved by a more rapid increase in the reflection coefficient in the near infrared region of the spectrum.

The thicknesses of the metal and dielectric layers are not arbitrary, they determine the optical properties of coatings for use in incandescent lamps,

In the proposed lamp, the following options are possible. Execution of the coating design;

Option

Dielectric, outer layer Metal (silver), nm

Dielectric layer on the glass side

III

(1/8) I „

13-28

(5/8) Yagt

IV

(5/8) ft,

4-9

(3/8) I „

3I436J

The dielectric physical thickness is for (5/8) L 148-153 nm and for (1/8) Dp 13-28 nm.

Claims (1)

5 claims Incandescent lamp, containing a filament body, hermetically installed in a flask of optically transparent material, on the inner surface of which a heat-reflecting coating is applied, consisting of metallic 49 a layer surrounded on both sides by dielectric layers, characterized in that, in order to increase its luminous efficiency, at least one of said dielectric layers is made of a material with a refractive index, 9 and has a thickness h chosen from the ratio nh (0.56-0.65) n, where I „is the wavelength corresponding to the maximum of the intensity of light transmission, T a b l and c a I FIG. 2 Compiled by N, Semenov Editor S. Patrusheva Tehred L. Serdyukrva Order 5651/50 Circulation 746 INPUTS USSR State Committee for inventions and discoveries I3035, Moscow, Zh-35, Raushsk nab., 4/5. Proofreader V. Girn to Subscription