GB1391677A - Square light projector using prismatic lens - Google Patents

Square light projector using prismatic lens

Info

Publication number
GB1391677A
GB1391677A GB2301172A GB2301172A GB1391677A GB 1391677 A GB1391677 A GB 1391677A GB 2301172 A GB2301172 A GB 2301172A GB 2301172 A GB2301172 A GB 2301172A GB 1391677 A GB1391677 A GB 1391677A
Authority
GB
United Kingdom
Prior art keywords
reflector
lens
light
composite
parabolic
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
GB2301172A
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.)
GRIMES Manufacturing Co
Original Assignee
GRIMES Manufacturing Co
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 GRIMES Manufacturing Co filed Critical GRIMES Manufacturing Co
Publication of GB1391677A publication Critical patent/GB1391677A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • F21V5/00—Refractors for light sources
    • F21V5/02—Refractors for light sources of prismatic shape

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

1391677 Lighting fittings GRIMES MFG CO 16 May 1972 [16 June 1971] 23011/72 Heading F4R [Also in Division G2] A lighting arrangement for projecting a square beam of light comprises a light source 12, and a reflector 10 so disposed with respect to the light source that it would normally project a non-collinated circular beam of light, and a lens 32 having four arcuate prismatic segments so disposed with respect to the reflector to displace respective quadrants of the circular light pattern to form a composite square light pattern 30 at a predetermined distance from the reflector. The reflector 10 may be of the tilted ellipse type, i.e. formed by revolving a tilted segment of an ellipse about an axis, in which the angle of tilt is small; or the reflector may be parabolic with the lamp filament displaced forwardly of its focus, and in either case the composite lens 32 is, as shown, thicker at its periphery. Alternatively, Figs. 6-8 (not shown), when the reflector is of fitted ellipse type having a large angle of tilt or when it is parabolic with the lamp filament displaced behind its focus, the composite lens is thicker at its centre. A Fresnel technique may be applied to either of the lens constructions to reduce its thickness.
GB2301172A 1971-06-16 1972-05-16 Square light projector using prismatic lens Expired GB1391677A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US15364271A 1971-06-16 1971-06-16

Publications (1)

Publication Number Publication Date
GB1391677A true GB1391677A (en) 1975-04-23

Family

ID=22548093

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2301172A Expired GB1391677A (en) 1971-06-16 1972-05-16 Square light projector using prismatic lens

Country Status (5)

Country Link
US (1) US3732417A (en)
CA (1) CA958393A (en)
DE (1) DE2229120A1 (en)
FR (1) FR2141789B1 (en)
GB (1) GB1391677A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2329036A (en) * 1997-09-05 1999-03-10 Sharp Kk Optical system for redistributing optical extent and illumination source
US6155688A (en) * 1997-09-05 2000-12-05 Sharp Kabushiki Kaisha Dark field projection display
GB2421584A (en) * 2004-12-21 2006-06-28 Sharp Kk Optical device with converging and diverging elements for directing light

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2247672B1 (en) * 1973-10-12 1976-06-18 Alexandre Et Co
FR2372380A1 (en) * 1976-11-30 1978-06-23 Barbier Benard & Turenne LIGHTING UNIT WITHOUT SHADOWS
US4670825A (en) * 1985-12-31 1987-06-02 Fouke Herbert A Reflector for use in uniformly illuminating a polygonal area
US4937715A (en) * 1989-01-26 1990-06-26 Kirschner Medical Corporation Lamp system for operating theatres and the like
US4994945A (en) * 1989-01-26 1991-02-19 Kirschner Medical Corporation Lamp system for operating theatres and the like
JP3005955B2 (en) 1998-04-17 2000-02-07 スタンレー電気株式会社 Lamp
US6969181B1 (en) 2001-05-08 2005-11-29 Genlyte Thomas Group Llc Fully recessed unit equipment luminaire
SE0201961D0 (en) * 2002-06-25 2002-06-25 Labino Patent Ab Lighting equipment
US20050047137A1 (en) * 2003-08-28 2005-03-03 Era Optoelectronics Inc. Cross-shaped laser rays generator with non-spherical lens
FR2875578B1 (en) * 2004-09-21 2006-12-15 Valeo Vision Sa SIGNALING LIGHT, IN PARTICULAR FOR MOTOR VEHICLE
JP3912407B2 (en) * 2004-12-14 2007-05-09 カシオ計算機株式会社 Light source unit and projector device
JP4218649B2 (en) * 2005-03-07 2009-02-04 カシオ計算機株式会社 Light source unit and projector device
FI20085548A0 (en) * 2008-06-04 2008-06-04 Valopaa Oy Device for direction and illumination of lighting
US8098434B1 (en) 2010-09-22 2012-01-17 3M Innovative Properties Company Optical decollimator for daylighting systems

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3344268A (en) * 1967-09-26 Refractor for usb in uniformly illuminating a polygonal area
US1350295A (en) * 1919-04-18 1920-08-24 Kirby Champeau Co Inc Illuminating means
US2124417A (en) * 1937-06-18 1938-07-19 New York World S Fair 1939 Inc Lighting fixture
US2366356A (en) * 1942-10-14 1945-01-02 Holophane Co Inc Luminaire

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2329036A (en) * 1997-09-05 1999-03-10 Sharp Kk Optical system for redistributing optical extent and illumination source
US6155688A (en) * 1997-09-05 2000-12-05 Sharp Kabushiki Kaisha Dark field projection display
GB2421584A (en) * 2004-12-21 2006-06-28 Sharp Kk Optical device with converging and diverging elements for directing light
US7817909B2 (en) 2004-12-21 2010-10-19 Sharp Kabushiki Kaisha Optical device and light source

Also Published As

Publication number Publication date
US3732417A (en) 1973-05-08
FR2141789B1 (en) 1977-12-23
CA958393A (en) 1974-11-26
FR2141789A1 (en) 1973-01-26
DE2229120A1 (en) 1972-12-21

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee