GB728541A - Improvements in or relating to electric incandescent lamps - Google Patents

Improvements in or relating to electric incandescent lamps

Info

Publication number
GB728541A
GB728541A GB5539/53A GB553953A GB728541A GB 728541 A GB728541 A GB 728541A GB 5539/53 A GB5539/53 A GB 5539/53A GB 553953 A GB553953 A GB 553953A GB 728541 A GB728541 A GB 728541A
Authority
GB
United Kingdom
Prior art keywords
reflectors
bulb
elliptical
incandescent lamps
electric
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
GB5539/53A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB728541A publication Critical patent/GB728541A/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
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F21V7/06—Optical design with parabolic curvature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/28—Envelopes; Vessels
    • H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof
    • H01K1/325—Reflecting coating

Landscapes

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

Abstract

728,541. Electric incandescent lamps. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 27, 1953 [March 4, 1952], No. 5539/53. Class 39 (2). In an electric incanoescent lamp comprising a b'ulb having integral reflectors, the shape of the surface of the reflectors is that generated by the revolution of upper and lower portions, AB and CD, symmetrically disposed relative to the major axis X-X and on the same side of the minor axis of an elliptical or substantially elliptical figure 4. about a line Y-Y extending at right angles to the axis connecting the focal points and passing through the focal point F<SP>1</SP> in which the filament 3 is located, the said parts of the elliptical figure, forming the reflectors, lying between said focal points. The reflectors may be formed on either the internal or external surface of the bulb. Fig. 2 is a plan view of the bulb 1, which projects a beam exhibiting considerable spread in width and little spread in height, and may be used as a warning lamp on vehicles. The part of the bulb between the reflecting surfaces may be coloured.
GB5539/53A 1952-03-04 1953-02-27 Improvements in or relating to electric incandescent lamps Expired GB728541A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL311971X 1952-03-04

Publications (1)

Publication Number Publication Date
GB728541A true GB728541A (en) 1955-04-20

Family

ID=19783656

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5539/53A Expired GB728541A (en) 1952-03-04 1953-02-27 Improvements in or relating to electric incandescent lamps

Country Status (7)

Country Link
US (1) US2799791A (en)
BE (1) BE518131A (en)
CH (1) CH311971A (en)
DE (1) DE942341C (en)
FR (1) FR1072116A (en)
GB (1) GB728541A (en)
IT (1) IT500078A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3256456A (en) * 1958-01-09 1966-06-14 Sylvania Electric Prod Reflector incandescent projection lamp
US3018403A (en) * 1958-03-05 1962-01-23 Westinghouse Electric Corp Reflector lamp
US2904714A (en) * 1958-06-16 1959-09-15 Gen Electric Electric lamp
GB904469A (en) * 1960-02-11 1962-08-29 Thorn Electrical Ind Ltd Improvements in and relating to projection lamps
US3162785A (en) * 1960-04-22 1964-12-22 Sylvania Electric Prod Projection lamp
US4280076A (en) * 1978-10-18 1981-07-21 Duro-Test Corporation Incandescent lamp with structure for collecting evaporated filament material
US4446397A (en) * 1981-09-28 1984-05-01 General Electric Company High intensity discharge lamp with infrared reflecting means for improving efficacy
FR2516204A1 (en) * 1981-11-06 1983-05-13 Lampes Sa AUTONOMOUS LIGHTING TERMINAL
US4992695A (en) * 1989-10-10 1991-02-12 Daniel Naum Reflector for high-intensity lamps
US5418420A (en) * 1993-06-22 1995-05-23 Ilc Technology, Inc. Arc lamp with a triplet reflector including a concave parabolic surface, a concave elliptical surface and a convex parabolic surface

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE94157C (en) *
DE339849C (en) * 1919-03-06 1921-08-13 Siemens & Halske Akt Ges Arc irradiation lamp, which is arranged on a column that is expediently adjustable in height
US1676300A (en) * 1927-02-21 1928-07-10 Sved Alexander Incandescent electric lamp
BE391856A (en) * 1931-11-16
FR784648A (en) * 1933-12-01 1935-07-22 Flattened and widened beam headlight which can be achieved by a suitably arranged incandescent lamp
US2110590A (en) * 1936-09-11 1938-03-08 Birdseye Electric Corp Reflecting incandescent lamp
US2272186A (en) * 1939-07-19 1942-02-10 Edward P Creehan Radiant energy projector
US2362176A (en) * 1943-03-25 1944-11-07 Swanson Harold Flashlight full-beam electric lamp
US2362172A (en) * 1943-03-25 1944-11-07 Swanson Harold Vehicle headlight with integral full-beam electric lamps
US2362175A (en) * 1943-03-25 1944-11-07 Swanson Harold Piped light full-beam electric lamp
NL69920C (en) * 1948-03-05

Also Published As

Publication number Publication date
CH311971A (en) 1955-12-15
US2799791A (en) 1957-07-16
FR1072116A (en) 1954-09-08
IT500078A (en)
DE942341C (en) 1956-05-03
BE518131A (en)

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