GB513912A - Improvements in or relating to illuminating devices - Google Patents

Improvements in or relating to illuminating devices

Info

Publication number
GB513912A
GB513912A GB9048/38A GB904838A GB513912A GB 513912 A GB513912 A GB 513912A GB 9048/38 A GB9048/38 A GB 9048/38A GB 904838 A GB904838 A GB 904838A GB 513912 A GB513912 A GB 513912A
Authority
GB
United Kingdom
Prior art keywords
reflector
focus
ceiling
frusto
angle
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
GB9048/38A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB9048/38A priority Critical patent/GB513912A/en
Publication of GB513912A publication Critical patent/GB513912A/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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/83—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks the elements having apertures, ducts or channels, e.g. heat radiation holes
    • 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
    • F21S8/02—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters
    • F21S8/026—Lighting devices intended for fixed installation of recess-mounted type, e.g. downlighters intended to be recessed in a ceiling or like overhead structure, e.g. suspended ceiling
    • 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
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/02—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using parallel laminae or strips, e.g. of Venetian-blind type
    • 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
    • F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
    • F21V13/02—Combinations of only two kinds of elements
    • F21V13/10—Combinations of only two kinds of elements the elements being reflectors and screens
    • 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
    • F21V21/00—Supporting, suspending, or attaching arrangements for lighting devices; Hand grips
    • F21V21/14—Adjustable mountings
    • F21V21/30—Pivoted housings or frames
    • 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
    • F21V7/09—Optical design with a combination of different curvatures

Landscapes

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

Abstract

513,912. Ceiling lamps; reflectors. RAMBUSH, N. E . (Rambusch, E., and Anderson, V. G.). March 24, 1938, No. 9048. [Classes 75 (ii) and 75 (iv)] A reflector for a ceiling lamp comprises a frusto-spherical part 16, and a frusto-ellipsoidal part 14, the latter extending above and below the common centre and focus 15 of these reflectors, where the light source is positioned, to such an extent that the angular dip of its lower rim beneath the focus 15 exceeds the angular elevation of its top rim above the focus by the angle which the spherical zone 16 in section subtends at the focus, i.e., the horizontal focal plane bisects the angle between the lines 35 and 34. Preferably this plane also trisects the angle between the lines 35 and 33. The outer edge of the reflector beam is thus intensified and uniform illumination obtained. The reflector may also have a parabolic upper part 17 confocal with the reflector 14 and a conical part 14a. It may be mounted in a tiltable casing 3 having annular baffle plates 10-13 projecting beneath the reflector to darken the side walls thereof and ventilation apertures 23b at the top, the lamp being mounted above a plate 1 fixed to a ceiling 1a in an aperture in which plate the lower focus 2a of the reflector 14 falls. The ellipsoidal reflector 14 may also have a depending extension in the form of a segment of the same ellipsoid to illuminate a wall at one side beneath the lamp. The lower tubular part and baffles of the casing may be replaced by an outwardly flaring part containing a frusto-conical reflector having a diffusing matt surface and the light obstructing part of the ceiling plate replaced by a dished diffusing globe apertured at the centre.
GB9048/38A 1938-03-24 1938-03-24 Improvements in or relating to illuminating devices Expired GB513912A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9048/38A GB513912A (en) 1938-03-24 1938-03-24 Improvements in or relating to illuminating devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9048/38A GB513912A (en) 1938-03-24 1938-03-24 Improvements in or relating to illuminating devices

Publications (1)

Publication Number Publication Date
GB513912A true GB513912A (en) 1939-10-25

Family

ID=9864387

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9048/38A Expired GB513912A (en) 1938-03-24 1938-03-24 Improvements in or relating to illuminating devices

Country Status (1)

Country Link
GB (1) GB513912A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3721278A1 (en) * 1987-06-27 1989-01-05 Swf Auto Electric Gmbh Adjustable reading lamp
EP0621438A1 (en) * 1993-04-21 1994-10-26 Siemens Aktiengesellschaft Ceiling lighting fixture
EP2187113A1 (en) * 2008-11-18 2010-05-19 Toshiba Lighting & Technology Corporation Lighting device including translucent cover for diffusing light from light source

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3721278A1 (en) * 1987-06-27 1989-01-05 Swf Auto Electric Gmbh Adjustable reading lamp
EP0621438A1 (en) * 1993-04-21 1994-10-26 Siemens Aktiengesellschaft Ceiling lighting fixture
EP2187113A1 (en) * 2008-11-18 2010-05-19 Toshiba Lighting & Technology Corporation Lighting device including translucent cover for diffusing light from light source

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