EP0418784A2 - Lampe mit Dünnschicht für die Reflexion der Infrarot-Strahlen - Google Patents

Lampe mit Dünnschicht für die Reflexion der Infrarot-Strahlen Download PDF

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Publication number
EP0418784A2
EP0418784A2 EP90117866A EP90117866A EP0418784A2 EP 0418784 A2 EP0418784 A2 EP 0418784A2 EP 90117866 A EP90117866 A EP 90117866A EP 90117866 A EP90117866 A EP 90117866A EP 0418784 A2 EP0418784 A2 EP 0418784A2
Authority
EP
European Patent Office
Prior art keywords
lamp
layer
optical thickness
bulb
light
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Withdrawn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
EP90117866A
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English (en)
French (fr)
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EP0418784A3 (en
Inventor
Tsune Miyashita
Masayoshi Kodama
Atsushi Hatakeyama
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Publication of EP0418784A2 publication Critical patent/EP0418784A2/de
Publication of EP0418784A3 publication Critical patent/EP0418784A3/en
Withdrawn legal-status Critical Current

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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/40—Devices for influencing the colour or wavelength of the light by light filters; by coloured coatings in or on the envelope

Definitions

  • This invention relates to a tungsten-halogen lamp comprising on the outer surface of a bulb a multi-­layer dielectric film for transmitting visible rays and reflecting infrared rays or an HID [High Intensity Discharge) lamp such as a metal halide lamp comprising a similar multi-layer dielectric film on the outer surface of an inner bulb, and more particularly to means for modifying the light-source color in such a lamp.
  • HID High Intensity Discharge
  • Provision of a transparent multi-layer dielectric film on a tungsten-halogen lamp so as to reflect infrared rays thereby improving the luminous efficacy of the lamp is disclosed in, for example, Japanese Patent Application Laid-Open (KOKAI) No. 57-­119454 (1982) or Japanese Patent Publication No. 1-14258 (1989). With respect to the thickness of the dielectric film in such instances, a description is given in, for example, Japanese Patent Application Laid-Open (KOKAI) No. 61-190853 (1986).
  • the multi-layer dielectric film with a regulated transmittance of rays in the visible region so as to cause the visible radiation from the lamp to have a yellow color, as for instance described in Japanese Utility Model Application Laid-Open (KOKAI) No. 1-86102 (1989).
  • KKAI Japanese Utility Model Application Laid-Open
  • a description of a reflector comprising a multi-layer dielectric film is made in, for example, Y. Yuge, "Review of Optical Coatings for Incandescent and Other Lamps", 5th International Symposium on the Science & Technology of Light Sources, York-England, 10-14 September, 1989.
  • a lamp according to this inventio in which the optical thickness of some of the layers in a multi-layer dielectric film provided on the surface of a lamp bulb is different from that of the other layers, whereby interference is generated between the layers to produce a reflection range over a narrow wavelength range in the visible region, resulting in a change in the light-source color of the lamp.
  • a multi-layer dielectric film provided on the surface of a lamp bulb produces an interference between the layers, thereby reflecting infrared rays back to the inside of the lamp. Therefore, the electric input required for heating the lamp is reduced, and energy saving is achieved.
  • lt is known that where the peak of reflection of the infrared rays by the multi-layer dielectric film is set in the vicinity of 1 ⁇ m, it is possible to reduce the reflection by the multi-layer dielectric film in the visible region of about 400 to 800 nm to a minimum, so that the radiation of the visible rays from the lamp is not reduced at all, which is favorable.
  • optical characteristics with good luminous efficacy are obtainable by setting the optical thickness of most layers in the multi-layer dielectric film equal to 1/4 times the wavelength and setting the optical thickness of only the uppermost, low-dielectric-­constant layer equal to 1/8 times the wavelength.
  • a multi-layer dielectric film having a desired reflectance in an arbitrary wavelength range in the visible region may also be provided, separately from the above-mentioned multi-layer dielectric film for reflecting the infrared rays. In that case, it is possible to cause the visible radiation from the lamp to have a desired color. The desired characteristics are not achieved, however, unless the interference between the multi-layer dielectric film for reflecting the infrared rays and the multi-layer dielectric film for reflecting the visible rays is prevented. lt is therefore necessary to provide a third layer for eliminating the interference between the two multi-layer dielectric films, with the result of an increase in the number of layers of dielectric film.
  • the transmittance for visible rays is reduced, resulting in a luminous efficacy poorer than that achieved in the case of reducing the reflectance in the visible region.
  • the low transmittance range When the transmittance of the low transmittance range is less than 10%, a sufficient alteration of the light-source color is not achieved.
  • the transmittance of the low transmittance range is more than 40%, on the other hand, the color relevant to the lowered transmittance is substantially absent in the light emitted from the lamp, which result is undesirable.
  • the low transmittance range is so broad as to have a half-width of more than 100 nm, an undesirable lowering in luminous efficacy would result.
  • Figure 1 illustrates a tungsten-halogen lamp according to one embodiment of this invention, which comprises a tungsten filament 1, tungsten inner leads 2, 2′, molybdenum foils 3, 3′, molybdenum outer leads 4, 4′, a base 5, a silica glass bulb 6, and beads 7.
  • a multi-­layer dielectric film which, as shown in an enlarged view indicated by an arrow comprises an alternate laminate of titanium oxide layers (refractive index: 2.30) 8 and silicon oxide layers (refractive index: 1.45) 9.
  • a metal halide lamp as an HID lamp according to another embodiment of this invention, which comprises inner leads 12, 12′, molybdenum foils 13, 13′, bases 15, 15′, and a silica glass bulb 16 as an inner bulb filled with a metal halide or the like.
  • the bulb 16 is provided with a heat-­insulating coating (not shown) on both ends thereof, and a pair of electrodes, not shown, are embedded in the ends of the bulb, in connection with respective molybdenum foils.
  • Denoted by 17 is an outer bulb.
  • a multi-layer dielectric film comprising an alternate laminate of titanium oxide layers and silicon oxide layers is baked on the outer surface of a central portion of the silica glass bulb 16 .
  • Figure 3 is a diagram showing the spectral reflectance of one example of the multi-layer dielectric film in the lamp shown in Figure 1 or 2. Curves a , b and c in the spectral reflectance diagram were obtained with the respective multi-layer dielectric films, as set forth in the following Table 1, provided on the surface of the lamp bulb.
  • the multi-layer dielectric film comprises a first layer (layer No. 1), a second layer (layer No. 2) and so on, in that order from the side of the silica glass bulb 6 or 16.
  • Optical thickness of film is given in the units of nd/ ⁇ 0, where ⁇ 0 is center of the wavelength, n is refractive index, and d is the thickness of film.
  • the curve a where the optical thickness of the fourth layer (layer No. 4) was changed from the predetermined value of 0.25 to a value of 0.20, indicates a weakening of a blue component of the light-source color, thereby producing the effect of increasing the warmth of color.
  • the curve b where the optical thickness of the fifth layer (layer No. 5) was changed from the predetermined value of 0.25 to a value of 1.00, indicates a weakening of a yellow component of the light-source color, with the resultant effect of rendering body colors more vivid.
  • the curve c where the optical thickness of the fourth layer (layer No.
  • Figure 4 is a diagram showing the spectral reflectance of another example of the multi-layer dielectric film used in the lamp shown in Figure 1 or 2.
  • curves a′, b′ and c′ correspond to the respective multi-layer dielectric films, as set forth in the following Table 2, provided on the surface of the lamp bulb.
  • the multi-layer dielectric film comprises a first layer (layer No. 1), a second layer (layer No. 2) and so on, in that order from the side of the silica glass bulb 6 or 16.
  • the curve a′ where the optical thickness of the fourth layer (layer No. 4) was changed from the predetermined value of 0.25 to a value of 0.20, indicates a weakening of a blue component of the light-source color, with the attendant effect of increasing the warmth of color.
  • the curve b′ where the optical thickness of the fifth layer (layer No. 5) was changed from the predetermined value of 0.25 to a value of 1.00, indicates a reduction in the quantity of a yellow color in the light-source color, with the resultant effect of rendering body colors more vivid.
  • the curve c′ where the optical thickness of the fourth layer (layer No. 4) was changed from the predetermined value of 0.25 to a value of 0.30, indicates a weakening of a red component of the light-source color, with the accompanying effect of producing a refreshing feeling.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Optical Filters (AREA)
EP19900117866 1989-09-20 1990-09-17 Lamp provided with thin film for reflecting infrared rays Withdrawn EP0418784A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP24199389A JPH03105849A (ja) 1989-09-20 1989-09-20 ランプ
JP241993/89 1989-09-20

Publications (2)

Publication Number Publication Date
EP0418784A2 true EP0418784A2 (de) 1991-03-27
EP0418784A3 EP0418784A3 (en) 1991-08-14

Family

ID=17082654

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900117866 Withdrawn EP0418784A3 (en) 1989-09-20 1990-09-17 Lamp provided with thin film for reflecting infrared rays

Country Status (2)

Country Link
EP (1) EP0418784A3 (de)
JP (1) JPH03105849A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0682356A3 (de) * 1994-05-12 1996-02-28 Iwasaki Electric Co Ltd Metallhalogenid Lampe.
GB2302208A (en) * 1995-06-09 1997-01-08 Gen Electric Electric incandescent lamps
WO2004053925A2 (en) 2002-12-12 2004-06-24 Philips Intellectual Property & Standards Gmbh Lamp with infrared reflecting coating
WO2008078241A1 (en) * 2006-12-20 2008-07-03 Philips Intellectual Property & Standards Gmbh White light emitting electric lamp assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT4408U1 (de) * 2000-05-18 2001-06-25 Plansee Ag Verfahren zur herstellung einer elektrischen lampe
JP4801612B2 (ja) * 2007-03-15 2011-10-26 モリト株式会社 ベルト取付金具

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1428608A (en) * 1973-02-14 1976-03-17 Canon Kk Dichroic mirrors
US4229066A (en) * 1978-09-20 1980-10-21 Optical Coating Laboratory, Inc. Visible transmitting and infrared reflecting filter
US4247167A (en) * 1977-05-27 1981-01-27 Canon Kabushiki Kaisha Dichroic mirror with at least ten layers
EP0041358A2 (de) * 1980-06-03 1981-12-09 Optical Coating Laboratory, Inc. Nichtpolarisierendes Dünnschichtfilter mit Kantencharakteristik und faseroptisches Nachrichtensystem mit einem solchen Filter
JPS61147449A (ja) * 1984-12-18 1986-07-05 Matsushita Electric Works Ltd 可変色螢光ランプ
WO1989002607A2 (en) * 1987-09-11 1989-03-23 Litton Systems Inc. Partly transparent mirror for a ring laser gyro

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1428608A (en) * 1973-02-14 1976-03-17 Canon Kk Dichroic mirrors
US4247167A (en) * 1977-05-27 1981-01-27 Canon Kabushiki Kaisha Dichroic mirror with at least ten layers
US4229066A (en) * 1978-09-20 1980-10-21 Optical Coating Laboratory, Inc. Visible transmitting and infrared reflecting filter
EP0041358A2 (de) * 1980-06-03 1981-12-09 Optical Coating Laboratory, Inc. Nichtpolarisierendes Dünnschichtfilter mit Kantencharakteristik und faseroptisches Nachrichtensystem mit einem solchen Filter
JPS61147449A (ja) * 1984-12-18 1986-07-05 Matsushita Electric Works Ltd 可変色螢光ランプ
WO1989002607A2 (en) * 1987-09-11 1989-03-23 Litton Systems Inc. Partly transparent mirror for a ring laser gyro

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 343 (E-456)(2399) 19 November 86, & JP-A-61 147449 (MATSUSHITA) 05 July 1986, *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0682356A3 (de) * 1994-05-12 1996-02-28 Iwasaki Electric Co Ltd Metallhalogenid Lampe.
US5646472A (en) * 1994-05-12 1997-07-08 Iwasaki Electric Co., Ltd. Metal halide lamp
GB2302208A (en) * 1995-06-09 1997-01-08 Gen Electric Electric incandescent lamps
GB2302208B (en) * 1995-06-09 1998-11-11 Gen Electric Electric incandescent lamps
WO2004053925A2 (en) 2002-12-12 2004-06-24 Philips Intellectual Property & Standards Gmbh Lamp with infrared reflecting coating
WO2004053925A3 (en) * 2002-12-12 2004-11-04 Philips Intellectual Property Lamp with infrared reflecting coating
US7204611B2 (en) 2002-12-12 2007-04-17 Koninklijke Philips Electronics, N.V. Lamp with coating reflecting middle infrared and transmitting near infrared
WO2008078241A1 (en) * 2006-12-20 2008-07-03 Philips Intellectual Property & Standards Gmbh White light emitting electric lamp assembly

Also Published As

Publication number Publication date
EP0418784A3 (en) 1991-08-14
JPH03105849A (ja) 1991-05-02

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