GB561540A - Improvements in and relating to luminairs - Google Patents

Improvements in and relating to luminairs

Info

Publication number
GB561540A
GB561540A GB2114/42A GB211442A GB561540A GB 561540 A GB561540 A GB 561540A GB 2114/42 A GB2114/42 A GB 2114/42A GB 211442 A GB211442 A GB 211442A GB 561540 A GB561540 A GB 561540A
Authority
GB
United Kingdom
Prior art keywords
lens
prisms
light source
parallel beam
increasing distances
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
GB2114/42A
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.)
Holophane Ltd
Original Assignee
Holophane Ltd
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 Holophane Ltd filed Critical Holophane Ltd
Publication of GB561540A publication Critical patent/GB561540A/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

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

561,540. Lamps for lighting. HOLOPHANE, Ltd. Feb. 17, 1942, No. 2114. Convention date, Nov. 27, 1940. [Class 75 (ii)] A lens for projecting concentrated light beams in controlled direction comprises upper and lower lens pieces 10, 11, the inner lens piece 10 nearer the light source LC being formed with prisms so shaped that the centres 23, 28, 30 from which the issuing light rays 25 at increasing distances from the centre of the lens appear to emanate are at increasing distances from the lens and the outer lens piece 11 being formed with prisms which concentrate the light rays 24 into a parallel beam. The light source may be displaced by as much as 30 degrees to points 15, 17, Fig. 1, or a point Lc, Fig. 2, while still giving a parallel beam. The prisms may be concentric or rectilinear and an elongated light source may be used.
GB2114/42A 1940-11-27 1942-02-17 Improvements in and relating to luminairs Expired GB561540A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US561540XA 1940-11-27 1940-11-27

Publications (1)

Publication Number Publication Date
GB561540A true GB561540A (en) 1944-05-24

Family

ID=22002525

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2114/42A Expired GB561540A (en) 1940-11-27 1942-02-17 Improvements in and relating to luminairs

Country Status (1)

Country Link
GB (1) GB561540A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118114A (en) * 1974-08-21 1978-10-03 Minnesota Mining And Manufacturing Company Low-glare overhead projector
GB2145809A (en) * 1983-08-29 1985-04-03 Canadian Patents Dev Lightning panel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4118114A (en) * 1974-08-21 1978-10-03 Minnesota Mining And Manufacturing Company Low-glare overhead projector
GB2145809A (en) * 1983-08-29 1985-04-03 Canadian Patents Dev Lightning panel

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