Invention Grant
- Patent Title: Light source in the form of a sealed beam ARC lamp including three reflective surfaces
- Patent Title (中): 光源为密封光束的形式，包括三个反射面
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Application No.: US750212Application Date: 1996-11-27
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Publication No.: US5869920APublication Date: 1999-02-09
- Inventor: Martin Kavanagh
- Applicant: Martin Kavanagh
- Applicant Address: GB2 London
- Assignee: Digital Projection Limited
- Current Assignee: Digital Projection Limited
- Current Assignee Address: GB2 London
- Priority: GBX9410872.7 19940531
- Main IPC: F21V7/09
- IPC: F21V7/09 ; H01J61/02 ; H01J61/35 ; H01J61/86 ; H01J61/98 ; H01J5/16
Abstract:
A light source suitable for use in a projection system is described. The light source is in a form of an arc lamp including an arc gap defined between an anode and a cathode. The arc gap is positioned at the focal point of a parabolic reflector which is truncated at its focal plane. A spherical reflector oppositely directed to the parabolic reflector and concentric with the focal point of the parabolic reflector is arranged so as to direct light from the arc which has not been intercepted by the parabolic reflector back into the arc gap.
Public/Granted literature
- US4857757A Drive circuit for a two layer laminated electrostriction element Public/Granted day:1989-08-15
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