EP0050267A2 - Dispositif pour éclairer des tableaux d'affichage de l'arrière - Google Patents

Dispositif pour éclairer des tableaux d'affichage de l'arrière Download PDF

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Publication number
EP0050267A2
EP0050267A2 EP81107964A EP81107964A EP0050267A2 EP 0050267 A2 EP0050267 A2 EP 0050267A2 EP 81107964 A EP81107964 A EP 81107964A EP 81107964 A EP81107964 A EP 81107964A EP 0050267 A2 EP0050267 A2 EP 0050267A2
Authority
EP
European Patent Office
Prior art keywords
light source
housing
mirrored
display panel
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Withdrawn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
EP81107964A
Other languages
German (de)
English (en)
Other versions
EP0050267A3 (fr
Inventor
Paul Albrecht
Joachim Dipl.-Phys. Lenz
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
Publication of EP0050267A2 publication Critical patent/EP0050267A2/fr
Publication of EP0050267A3 publication Critical patent/EP0050267A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/14—Arrangements of reflectors therein
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F13/0422—Reflectors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/14—Arrangements of reflectors therein
    • G09F2013/145—Arrangements of reflectors therein curved reflectors

Definitions

  • the invention relates to a device for backlighting large-scale, only partially transparent or translucent display panels, such as Scales, dials or the like, with a small-area light source arranged in a housing.
  • signal lights usually consist of a partially transparent front panel, behind which there is a light source, preferably an incandescent lamp, in a housing.
  • a device of the type mentioned according to the invention is characterized in that the housing receiving the light source reflects well on the inside, ... preferably mirrored, and is provided with a cover which lies against the back of the display panel and which is in the areas to be illuminated the display panels are transparent and otherwise mirrored.
  • the formation of the step mirror should be designed in accordance with the respective arrangement of the transparent or backlit areas of the display panel. For example, when backlighting a dial with hour symbols arranged on a circle or the like. Just below this illumination circle, an oblique step of the step mirror of the housing should be arranged in order to emit light directed directly behind this area to the front.
  • the requirement according to the invention of the most uniform possible luminance over the entire display area can be achieved particularly well in a further embodiment of the invention in that the light source is arranged under a mirrored section of the cover, so that a direct light emission, combined with a corresponding overexposure of this area of the Scoreboard is avoided.
  • the inner surface of the lid above the light source be convexly curved in such a way that the light emitted upwards is deflected to the side. This strong lateral deflection prevents the light necessary for backlighting in the outer region of the display panel from experiencing a large number of reflections which run relatively steeply to the base surface or to the lid before it reaches this outer region.
  • the light source with a cold light mirror, so that the infrared radiation can emerge from the rear of the housing without loss of visible useful light and thus excessive heating of the backlighting device, in particular the display panel itself, is avoided.
  • a dial for a clock is selected as the display panel, in which the transparent recessed digits 1 to 12 are to be illuminated from the rear by backlighting, so that they are visible even at a greater distance.
  • the area of the display panel 1 itself, apart from the areas of the digits, is opaque.
  • a lighting device consisting of a housing 3 and a cover 4 is arranged behind the display panel 1 representing the dial, in which the light source 5 is located. The electrical leads to this light skin are not shown for the sake of simplicity.
  • the bottom 6 and the inner wall 8 of the housing which is designed in the manner of a step mirror with a plurality of inclined ring sections 7, are mirrored, as is the inside of the cover 4, with the exception of those areas which lie below the areas 2 of the display panel 1 to be illuminated.
  • the lid 4 is provided in its central region lying above the light source 5 with an inward dome-shaped curvature 9, which, since backlighting of parts of the display panel is not necessary at this point, is also mirrored. It is thereby achieved that the light emitted to the front is deflected essentially horizontally outwards by the inclined surface 10 of the dome-shaped elevation 9, so that this light emerges forwards through the non-mirrored areas 11 of the cover after only one reflection at one of the step surfaces 7 and thus can backlight the desired areas 2 of the display panel.
  • a cold light mirror is shown, which is arranged in the central region of the bottom 6 of the housing 3 and is used to allow infrared radiation to emerge harmlessly backwards without loss of visible useful light.
  • the device according to the invention for backlighting large-area display panels can be used very effectively even when the areas of the display panel to be illuminated are not arranged in a rotationally symmetrical manner, as long as the total area of the areas to be illuminated is approximately in the order of 10% of the total area of the display panel.
  • the inside of the lid, in particular the central dome-like elevation can also be designed as a step mirror.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Details Of Measuring Devices (AREA)
  • Details Of Measuring And Other Instruments (AREA)
EP81107964A 1980-10-18 1981-10-06 Dispositif pour éclairer des tableaux d'affichage de l'arrière Withdrawn EP0050267A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803039450 DE3039450A1 (de) 1980-10-18 1980-10-18 Vorrichtung zum hinterleuchten grossflaechiger anzeigetafeln
DE3039450 1980-10-18

Publications (2)

Publication Number Publication Date
EP0050267A2 true EP0050267A2 (fr) 1982-04-28
EP0050267A3 EP0050267A3 (fr) 1982-09-22

Family

ID=6114720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81107964A Withdrawn EP0050267A3 (fr) 1980-10-18 1981-10-06 Dispositif pour éclairer des tableaux d'affichage de l'arrière

Country Status (3)

Country Link
EP (1) EP0050267A3 (fr)
JP (1) JPS5797493A (fr)
DE (1) DE3039450A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8700992U1 (de) * 1987-01-22 1987-03-05 Fa. Ed. Liesegang, 40221 Düsseldorf Projektionsvorrichtung
EP0426242A1 (fr) * 1989-10-30 1991-05-08 Janse Lichtreklame B.V. Système de publicité avec déflecteur

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4122118C2 (de) * 1991-07-04 1997-04-24 Abb Patent Gmbh Schriftfeldbeleuchtung
DE10258176C5 (de) * 2002-12-12 2011-05-05 Continental Automotive Gmbh Beleuchtungsanordnung für Bedien- und/oder Anzeigeinstrumente

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE669465C (de) * 1937-04-25 1938-12-27 Ludwig Alexander Leuchtbild
US3859782A (en) * 1973-05-09 1975-01-14 Seiko Koki Kk Clock with illumination device
US3864861A (en) * 1973-09-21 1975-02-11 Jr Richard H Hill Illuminated display device
US3899871A (en) * 1973-05-09 1975-08-19 Seiko Koki Kk Clock with dial illumination

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE669465C (de) * 1937-04-25 1938-12-27 Ludwig Alexander Leuchtbild
US3859782A (en) * 1973-05-09 1975-01-14 Seiko Koki Kk Clock with illumination device
US3899871A (en) * 1973-05-09 1975-08-19 Seiko Koki Kk Clock with dial illumination
US3864861A (en) * 1973-09-21 1975-02-11 Jr Richard H Hill Illuminated display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE8700992U1 (de) * 1987-01-22 1987-03-05 Fa. Ed. Liesegang, 40221 Düsseldorf Projektionsvorrichtung
EP0426242A1 (fr) * 1989-10-30 1991-05-08 Janse Lichtreklame B.V. Système de publicité avec déflecteur

Also Published As

Publication number Publication date
JPS5797493A (en) 1982-06-17
EP0050267A3 (fr) 1982-09-22
DE3039450A1 (de) 1982-06-16

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT BE CH FR GB IT LI LU NL SE

PUAL Search report despatched

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Effective date: 19821208

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Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19840830

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ALBRECHT, PAUL

Inventor name: LENZ, JOACHIM, DIPL.-PHYS.