EP0699864A1 - Elektrische Reflektorleuchte - Google Patents

Elektrische Reflektorleuchte Download PDF

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Publication number
EP0699864A1
EP0699864A1 EP94202459A EP94202459A EP0699864A1 EP 0699864 A1 EP0699864 A1 EP 0699864A1 EP 94202459 A EP94202459 A EP 94202459A EP 94202459 A EP94202459 A EP 94202459A EP 0699864 A1 EP0699864 A1 EP 0699864A1
Authority
EP
European Patent Office
Prior art keywords
optical axis
lamp
reflecting surface
light source
zone
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.)
Withdrawn
Application number
EP94202459A
Other languages
English (en)
French (fr)
Inventor
Egbertus Johannes Petrus Maassen
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.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Philips Electronics NV
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 Koninklijke Philips Electronics NV, Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP94202459A priority Critical patent/EP0699864A1/de
Priority to PCT/IB1995/000635 priority patent/WO1996007051A1/en
Priority to JP50858596A priority patent/JP4094054B2/ja
Priority to DE69517944T priority patent/DE69517944T2/de
Priority to ES95926470T priority patent/ES2153488T3/es
Priority to EP95926470A priority patent/EP0728277B1/de
Priority to CN95190818A priority patent/CN1073221C/zh
Priority to US08/517,154 priority patent/US5667297A/en
Publication of EP0699864A1 publication Critical patent/EP0699864A1/de
Withdrawn legal-status Critical Current

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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
    • F21V7/09—Optical design with a combination of different curvatures

Definitions

  • the invention relates to an electric reflector lamp provided with a reflector body with a concave reflecting surface having an optical axis, which reflector body has a light emission window which is closed off with a light-transmitting cover, a light source on the optical axis accommodated in a lamp vessel which is closed in a gastight manner, a lamp cap provided with contacts and connected to the reflector body, current conductors which connect the light source to respective contacts of the lamp cap, the reflecting surface being subdivided into axial lanes.
  • Such an electric reflector lamp is known from EP-A 0 543 448 (PHN 13.900).
  • the known reflector lamp may have electrodes in an ionizable filling or an incandescent body as its light source.
  • the known lamp was found to yield a light beam in which, in the presence of an incandescent body as the light source, differences in brightness between portions of the incandescent body become evident, so that the beam is inhomogeneous.
  • differences in brightness may also arise in the beam, for example owing to a current conductor which extends alongside the discharge arc.
  • the lamp With a high-pressure metal halide discharge, the lamp provides an illuminated field in which colour differences occur. When the lamp radiates predominantly upwards, the colour pattern is different from the pattern when it radiates predominantly downwards.
  • the shape of the generated light beam in addition, strongly depends on the location occupied by the discharge arc in the reflector body.
  • the reflecting surface is the body of revolution around the optical axis of a branch of a parabola which has been tilted towards the optical axis and whose focus lies on the optical axis inside the light source, the axial lanes being superimposed on said surface, the axial lanes are plane transverse to their axial direction and give the reflecting surface cross-sections transverse to the optical axis which are regular polygons, a first zone remote from the light emission window has half the number of axial lanes which a second zone adjacent the light emission window has.
  • the measures taken in the reflector lamp according to the invention result in an effective beam concentration and mixing of the light generated by the light source. As a result, a light beam with a comparatively high luminous flux and a high degree of homogeneity is obtained.
  • the reflector lamp with a discharge arc yields a beam with a high colour uniformity, also when it is operated in a random position.
  • the properties of the light beam of the reflector lamp show little dependence on the position of the light source in the reflector body, so that the light source has a wide mounting tolerance.
  • the lamp vessel of the reflector lamp may be made of glass, for example of quartz glass, or alternatively of hard glass with an incandescent body acting as the light source, or of a ceramic material, for example mono- or polycrystalline aluminium oxide. If so desired, for example in the case of a ceramic lamp vessel, it may be accommodated in an envelope, for example of quartz glass, which is closed in a gastight manner, for example if the space within the reflector body is not evacuated or filled with an inert gas.
  • the reflector body and the cover may be moulded from glass, but may alternatively be made from, for example, a synthetic resin.
  • the reflector body may alternatively be made from metal.
  • the reflecting surface in the latter case may be obtained, for example, through polishing, or in the case of aluminium, through anodizing.
  • the reflecting surface may be obtained through deposition of a metal film, for example by vapour deposition, for example an aluminium, silver, or gold film.
  • a light-reflecting interference film may be provided built up from alternating layers of high and low refractive index such as, for example, of niobium oxide, tantalum oxide, silicon nitride, etc ., and silicon oxide, respectively.
  • the cover may be formed as a lens, for example a prismatic lens.
  • the cover has, for example, prismatic rings at its inner surface.
  • An otherwise narrow beam of approximately 10° may then be widened to, for example, approximately 30°.
  • the second zone having the greater number of axial lanes extends entirely between the light emission window and a plane perpendicular to the optical axis and through the focus.
  • the second zone extends up to locations which enclose an angle ⁇ of 80 ⁇ 5° with the optical axis, measured from the focus.
  • the reflector lamp according to the invention provides a welcome solution especially where the light source is formed by electrodes in an ionizable filling containing metal halides because of the unpleasant colour differences in the beam which occur with conventional reflector lamps having such light sources.
  • the electric reflector lamp of Fig. 1 is provided with a reflector body 1 with a concave reflecting surface 2 having an optical axis 3.
  • the reflector body has a light emission window 4 which is closed with a light-transmitting cover 5.
  • a light source 13, in the Figure electrodes in an ionizable gas with a discharge path 12 in between, is arranged on the optical axis, accommodated in a lamp vessel 11 which is closed in a gastight manner and which is made of polycrystalline aluminium oxide in Fig. 1.
  • a lamp cap 20 with contacts 21 is connected to the reflector body 1.
  • Current conductors 22 connect the light source 13 to respective contacts 21 of the lamp cap 20.
  • the reflecting surface 2 is subdivided into axial links 6.
  • the reflecting surface 2 is the body of revolution about the optical axis 3 of a branch 7 of a parabola which has been tilted towards the optical axis 3 and whose focus 8 lies on the optical axis inside the light source 13, between the electrodes.
  • the axis of the parabola branch 7 is referenced 7' in Fig. 1. This axis encloses an angle of a few, for example 3 to 6, degrees with the optical axis 3.
  • the axial lanes 6 are superimposed on said surface.
  • the axial lanes 6 are plane in a direction transverse to their axial direction and give the reflecting surface 2 cross-sections transverse to the optical axis 3 which are regular polygons.
  • a first zone 9 (Fig. 1) remote from the light emission window 4 has half the number of axial lanes, i.e. 30 in the Figure, of a second zone 10 adjacent the light emission window, which has 60 lanes.
  • the number of lanes in the first zone may be chosen to be greater or smaller.
  • the second zone 10 extends completely between the light emission window 4 and a plane perpendicular to the optical axis 3 and through the focus 8, in Fig. 1 up to locations which enclose an angle ⁇ of 80 ⁇ 5° with the optical axis, measured from the focus 8.
  • the ionizable filling of the discharge vessel 11 comprises rare gas and metal halides, for example sodium, thallium, and dysprosium halides. A high-pressure discharge is maintained therein during operation.
  • the cover 5 is a lens with a prismatic inner surface.
  • the lamp vessel 11 is arranged in a gastight quartz glass envelope 14.
  • the lamp shown has a light emission window of approximately 6.5 cm, consumes a power of 35 W during operation, and yields approximately 3400 lm.
  • the reflector lamp yields a light beam which is independent of the burning position and homogeneous in colour, and which has a width of 30° and a luminous intensity of 7 kcd in the centre of the beam.
  • the current conductor 22 which runs alongside the lamp vessel has no observable influence on the beam.
  • the beam width is 10° and the luminous intensity in the centre approximately 33 kcd.
  • the beam formed shows little dependence on the location of the focus inside the light source.
  • the burner has an incandescent body in the shape of an M in the elevation shown as its light source 33, accommodated in a glass lamp vessel 31 from which current conductors 42 issue to the exterior, capable of connecting the light source to respective contacts of the lamp cap of a lamp.
  • the burner may be accommodated in the reflector body of Fig. 1, so that the focus 8 thereof will be positioned inside the light source.
  • the light source consumes a power of 75 W when operated on mains voltage.
  • the lamp vessel has a filling of rare gas and hydrogen bromide. Inhomogeneities are avoided in the beam formed by the reflector lamp having this burner. The location of the focus within the light source is found to be of little influence.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
EP94202459A 1994-08-29 1994-08-29 Elektrische Reflektorleuchte Withdrawn EP0699864A1 (de)

Priority Applications (8)

Application Number Priority Date Filing Date Title
EP94202459A EP0699864A1 (de) 1994-08-29 1994-08-29 Elektrische Reflektorleuchte
PCT/IB1995/000635 WO1996007051A1 (en) 1994-08-29 1995-08-11 Electric reflector lamp
JP50858596A JP4094054B2 (ja) 1994-08-29 1995-08-11 反射形ランプ
DE69517944T DE69517944T2 (de) 1994-08-29 1995-08-11 Elektrische reflektorlampe
ES95926470T ES2153488T3 (es) 1994-08-29 1995-08-11 Lampara reflectora electrica.
EP95926470A EP0728277B1 (de) 1994-08-29 1995-08-11 Elektrische reflektorlampe
CN95190818A CN1073221C (zh) 1994-08-29 1995-08-11 反光罩电灯
US08/517,154 US5667297A (en) 1994-08-29 1995-08-21 Electric reflector lamp

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94202459A EP0699864A1 (de) 1994-08-29 1994-08-29 Elektrische Reflektorleuchte

Publications (1)

Publication Number Publication Date
EP0699864A1 true EP0699864A1 (de) 1996-03-06

Family

ID=8217145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94202459A Withdrawn EP0699864A1 (de) 1994-08-29 1994-08-29 Elektrische Reflektorleuchte

Country Status (1)

Country Link
EP (1) EP0699864A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2080969A (en) * 1980-07-22 1982-02-10 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Reflector for illuminating an area
GB2198516A (en) * 1986-12-04 1988-06-15 Philips Nv Luminaire
EP0465198A2 (de) * 1990-07-02 1992-01-08 General Electric Company Scheinwerferlampe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2080969A (en) * 1980-07-22 1982-02-10 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Reflector for illuminating an area
GB2198516A (en) * 1986-12-04 1988-06-15 Philips Nv Luminaire
EP0465198A2 (de) * 1990-07-02 1992-01-08 General Electric Company Scheinwerferlampe

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