Lighting device

Details Lighting device Lighting device

1980-12-04

1983-06-14

Walsh, Donald P.

Illumination

Light source and modifier

Fluorescent type

362 33, 362223, F21V 1300

Patent

active

043886760

ABSTRACT:
A straight cylindrical light source formed of, for example, a fluorescent lamp is set in place at a predetermined distance from a desk top surface. A reflector whose cross section is shaped substantially like a parabola is positioned at the back of the light source. A housing having an opening formed at least on the underside is provided to enclose the light source and reflector. Where a vertical angle defined by a straight line l.sub.0 connecting the axis of the light source to the front edge of the desk top surface defines .theta..sub.0, then a vertical angle .theta..sub.1 defined by a straight line l.sub.1 tangentially contacting the upper peripheral surface of the cylindrical light source and extending to the front end of the lower opening of the housing is also prescribed to be substantially .theta..sub.0. A vertical angle .theta..sub.2 defined by a straight line l.sub.2 passing through the upper terminal end of the reflector and tangentially contacting the lower peripheral surface of the cylindrical light source is also chosen to be substantially .theta..sub.0. The reflector is so positioned that the focal point of its parabolic cross section is substantially aligned with the axis of the light source, and a vertical angle .theta..sub.3 defined by a straight line l.sub.3 extending along the axis of the parabolic cross section of the reflector is likewise taken to be .theta..sub.0.

REFERENCES:
patent: 3389246 (1968-06-01), Shemitz
patent: 4173034 (1979-10-01), Shemitz
patent: 4300185 (1981-11-01), Wakamatsu
A New Concept for Better Lighting and Power Utilization by Hentschel et al., from the Seimens Review XLV (1978), No. 11, pp. 507-510.
"Editorial" from Interior, Sep. 1975, pp. 87-97.

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