GB1409904A - Lighting systems - Google Patents

Lighting systems

Info

Publication number
GB1409904A
GB1409904A GB4090372A GB4090372A GB1409904A GB 1409904 A GB1409904 A GB 1409904A GB 4090372 A GB4090372 A GB 4090372A GB 4090372 A GB4090372 A GB 4090372A GB 1409904 A GB1409904 A GB 1409904A
Authority
GB
United Kingdom
Prior art keywords
focus
ellipse
segment
electrodes
reflector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4090372A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Optical Radiation Corp
Original Assignee
Optical Radiation Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Optical Radiation Corp filed Critical Optical Radiation Corp
Priority to GB4090372A priority Critical patent/GB1409904A/en
Publication of GB1409904A publication Critical patent/GB1409904A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S8/00—Lighting devices intended for fixed installation
    • F21S8/006—Solar simulators, e.g. for testing photovoltaic panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/08—Optical design with elliptical curvature
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2006—Lamp housings characterised by the light source
    • G03B21/2026—Gas discharge type light sources, e.g. arcs

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

1409904 Elliptical reflector OPTICAL RADIATION CORP 4 Sept 1972 40903/72 Heading F4R [Also in Division G2] A film projector light has a pair of spaced electrodes producing an annulus of light 13 between them, a reflector 12 whose surface of revolution comprises a segment S of an ellipse with its major axes rotated from the axis through the electrodes about the first focus f 1 of the ellipse and an apertured screen 14 at the ring of the second focus f 2N of the ellipse. The ends of the segment subtend angles at the electrodes 10 degrees greater than the edge angles of the annulus and the light image is ¥ of the greatest dimension of the aperture. Preferably a xenon arc lamp is used with its region of greatest radiance set at the first focus. The segment S may be rotated clockwise or anti-clockwise about the first focus. In use the apertured screen forms the gate of a projector (Fig. 3, not shown) and if a small gate is used a concave refractor (60, Fig. 4, not shown) is used to reduce the area of the second focus. The shape of the reflector is said to give even illumination in the aperture.
GB4090372A 1972-09-04 1972-09-04 Lighting systems Expired GB1409904A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4090372A GB1409904A (en) 1972-09-04 1972-09-04 Lighting systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4090372A GB1409904A (en) 1972-09-04 1972-09-04 Lighting systems

Publications (1)

Publication Number Publication Date
GB1409904A true GB1409904A (en) 1975-10-15

Family

ID=10417187

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4090372A Expired GB1409904A (en) 1972-09-04 1972-09-04 Lighting systems

Country Status (1)

Country Link
GB (1) GB1409904A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2921068A1 (en) * 1978-05-23 1979-11-29 Lucas Industries Ltd VEHICLE HEADLIGHTS
DE3843254A1 (en) * 1988-12-22 1990-07-12 Emda Dental multi-purpose luminaire
DE3843253A1 (en) * 1988-12-22 1990-07-12 Emda Dental illumination unit
EP1635215A1 (en) * 2004-09-14 2006-03-15 Seiko Epson Corporation Light source device with discharge tube disposed in the neck of a reflector and projector therewith

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2921068A1 (en) * 1978-05-23 1979-11-29 Lucas Industries Ltd VEHICLE HEADLIGHTS
DE3843254A1 (en) * 1988-12-22 1990-07-12 Emda Dental multi-purpose luminaire
DE3843253A1 (en) * 1988-12-22 1990-07-12 Emda Dental illumination unit
EP1635215A1 (en) * 2004-09-14 2006-03-15 Seiko Epson Corporation Light source device with discharge tube disposed in the neck of a reflector and projector therewith
US7357531B2 (en) 2004-09-14 2008-04-15 Seiko Epson Corporation Light source device and projector

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee