Projector type lighting device
US5305189A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 1993 |
| Grant date | Apr 19, 1994 |
| Priority date | — |
| Expiry date | Jun 10, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S41/365
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lighting device includes a cutout portion formed at the lower part of a reflective mirror corresponding to a part of the light beam reflected from the reflective mirror and shaded by a shading plate, a first reflective plane consisting of a left-hand reflective plane half and a right-hand reflective plane half for allowing a large part of the light beam emitted directly from the light source to converge in the vertical direction, and a second reflective plane disposed behind the first reflective plane with a vertical attitude for allowing a large part of the light beam reflected from the first reflective plane to be reflected again at the second reflective plane to converge in the vertical direction, to improve a light beam utilizing rate of a light source and light irradiating performances of a projector type lighting device, and moreover, increase a light irradiating intensity of the lighting device. To additionally increase the light irradiating intensity of the lighting device, it is desirable that a third reflective plane is disposed in the form of a concave parabolic surface at the foremost end part of a joint zone between the left-hand reflective plane half and the right-h…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.