SU1185431A1 - Luminiscent lamp - Google Patents

Description

The invention relates to electrical, technical industry and can be used in the production of gas-discharge light sources, in particular single-ended fluorescent lamps of compact form.

The aim of the invention is to increase the light output and manufacturability while simultaneously expanding the field of use.

FIG. 1 shows a fluorescent lamp with four glass-tube limiting discharge in FIG. 2 and 3 - the lower and upper caps; in fig. 4 is a section A-A in FIG. 3; in fig. 5 is a section BB in FIG. 3

The lamp includes an outer cylindrical glass cylinder 1, which is plugged at one end, with a leg 2 welded to the base with an evacuated pinge 3, on which glass tubes 4, limiting the discharge, are mounted parallel to each other. A phosphor coating 5 is applied to the inner surface of the tubes. Tubes 4 are closed at both ends with plugs 6, clamped together by a metal bracket 7, and plugs 6 are made of a light-scattering material, for example, polycrystalline ceramics or molded glass.

The bracket 7 is mounted in the through holes 8 formed in the center of each plug 6. The volumes of adjacent glass tubes are communicated by means of transition channels 9, the location of which provides a volumetric zigzag shape of the discharge channel. To fix the position of the discharge-limiting tubes and prevent electrical disruption of the discharge between adjacent tubes, caps 6 are provided with collars 10. Thermionic electrodes are mounted on legs 11 located at the ends of two tubes that are not connected by transition channels with adjacent tubes. That of the plugs 6, which is installed on the side of the base 12, has holes 13 for the passage of current leads 14.

Filling the lamp is a mixture of mercury vapor with an inert gas.

The lamp base is located

starter glow discharge 15, connected to one of the conclusions of each electrode.

The lamp works as follows.

After supplying voltage to a circuit including a lamp connected in series and a ballast of a known type, the starter closes the electrical circuit, and the electrodes are calcined, which cause the preliminary ionization of mercury atoms.

; Then the contacts of the starter are opened, a voltage pulse is generated that ignites the discharge. Due to the fact that the size of the gaps between the shoulders and tubes, as well as between the current leads and the side surface of the holes through which the current leads pass, is much smaller than the cross-sectional area of the transition channels, the level of which is limited from the inside of the plug to the base-surface. This method, in which the ends of the tubes rest, prevents the possibility of discharge breakdown along the external surface of the tubes.

The width of the gaps between the shoulder and tubes, to prevent the possibility of discharge breakdown on the external surface of the plugs, should not exceed 0.05 of the internal diameter of the tube. Reducing the gap width does not impair lamp operation.

The height of these gaps should be at least 0.2 of the internal diameter of the tube in order to prevent the possibility of discharge breakdown. Increasing the height of the gaps does not affect the lamp burning mode, but it is impractical from the point of view of material consumption and reduction of the light output of the lamp due to the shielding effect of the shoulders.

The proposed design allows the use of tubes without spec. social processing of the ends (grinding, reflow), since small irregularities at the ends of the tubes, which rest against the end face of the plug, provide appropriate gaps for gas exchange.

1185431

Claims (2)

LUMINESCENT LAMP containing an external cylinder filled with a mixture of metal vapors with an inert gas, the base of which is welded on the legs with two thermionic electrodes located on the current leads, mounted along the axis of the glass tube surrounding one of these electrodes on the inner surface which causes a phosphor coating, and a base, characterized in that, in order to increase the light output and manufacturability while simultaneously expanding the field of use, it is equipped with at least one additional glass tube with a phosphor · coating on the inner surface installed parallel to the first one, on the opposite the ends of the glass tubes are unpressurized with plugs made of light-scattering material, fitted with shoulders covering the outer side surfaces of the glass t ubok so as to form gaps, the width and height of which is not more than 0.05 and not less than 0.2 the internal diameter of the tube, wherein the cap has apertures for the current leads u_ channels for connecting the discharge space bounded by said tube. zi. „1185431 > one 1185431 2