SU1636896A1 - Gaseous-discharge lamp - Google Patents

Abstract

This invention relates to electrical engineering, in particular, to high pressure gas discharge lamps. The aim of the invention is to increase the light output while providing the required light distribution. Mirror layer 6 is applied to parts of the inner surface of the outer bulb. A beam of light emanating from the center of the burner in the direction of mirror layer 6 is reflected from it. The ratio r0 / r continuously varies with p, therefore the normal to the mirror surface at the point of incidence of the beam is directed past the axis of the burner and the reflected beam is not attenuated in the burner. As a result, the light output increases. In addition, by creating lamps with different profiles of the mirrored part of the bulb, it is possible to produce lamps with different light distribution. 1 hp f-ly, 3 Il.

Description

1

This invention relates to electrical engineering, in particular, to high pressure gas discharge lamps.

The aim of the invention is to increase the light output while ensuring light distribution.

Figure 1 presents the proposed lamp, a general view; Figures 2 and 3 show the course of the incident and reflected rays with different cross-sectional variations of the outer bulb.

The lamp consists of a burner 1 mounted on the current leads 2, which are welded into the stem 3 of the outer bulb 4. The lamp is connected to the electrical circuit through the base 5. A mirror layer 6 is applied to part of the inner surface of the outer bulb, and the plane passing through its edge is parallel to the longitudinal axis of the burner 7. In figure 1, the mirror layer is indicated by hatching, in figure 2 by a dotted line.

The lamp works as follows.

A beam of light emanating from the center of the burner in the direction of the reflecting part of the outer bulb, falls on the mirror layer. So

Go

as a relation, it constantly changes with

by changing p, the normal to the mirror surface at the point of incidence of the beam is not directed at the axis of the burner, but past it, whereby the reflected beam passes by the burner and is not weakened in it. Rays of light emanating from the burner in the direction of the exit window emerge from the lamp without reflection. Thus, the light output of such a lamp is higher than the light output of a lamp with a circular-losymmetric bulb. In addition, creating lamps with different profiles of the mirror surface, i.e. different dependences T0 / r ((p you can get lamps with different light distribution.

In case the ratio% e) takes values both greater and less than 1 and with increasing (p both increases and decreases, the reflector profile has both

but

ten

15

20

25

thirty

35

40

45

the rule is a convex-concave surface (Fig. 2), if the ratio constantly decreases with modulus p, then the reflector profile has only a convex surface (Fig. 3). An increase of 90 ° expands the possibilities of creating lamps with different light distribution, however, at lyWcd 115 °, the proportion of radiation emitted after multiple reflections increases significantly, and the efficiency of the lamp decreases.

The proposed lamp with a burner from a DNaT lamp with a power of 100 W, a reflector profile of an external bulb corresponding to FIG. 3 (- 0.82), and a corner of coverage

G W max

max1 105 ° has a light output of 75.3 lm / W, while a similar lamp with a round-symmetrical bulb and J Umax | 90 ° has a light output of 69.8 lm / W.

Claims (2)

1. A discharge lamp of a high pressure containing a burner mounted on current leads welded to the outer bulb leg, at least half of the inner surface of which is covered with a reflecting mirror layer so that the plane passing through its edge is parallel to the longitudinal axis of the burner, differing in that, in order to increase its light output while ensuring the required light distribution, the shape of the mirrored part of the outer bulb is chosen such that for any cross section the ratio of the distance from the axis of to the mirror surface in the longitudinal plane of symmetry r0 to the corresponding distance T (p in the plane rotated around the axis of the burner at an angle f, continuously varies with angle and lies in the range 0.7-1.1. 2. A lamp according to claim 1, characterized in that the ratio r0 / gue continuously decreases with a change in p and lies in the range of 1-0.7 at 0 I p I pmax FIG. 2 Fi.Z