WO1986002157A1 - Eclairage d'instruments de mesure - Google Patents

Eclairage d'instruments de mesure Download PDF

Info

Publication number
WO1986002157A1
WO1986002157A1 PCT/NL1985/000038 NL8500038W WO8602157A1 WO 1986002157 A1 WO1986002157 A1 WO 1986002157A1 NL 8500038 W NL8500038 W NL 8500038W WO 8602157 A1 WO8602157 A1 WO 8602157A1
Authority
WO
WIPO (PCT)
Prior art keywords
dial
light sources
rim
light
led
Prior art date
Application number
PCT/NL1985/000038
Other languages
English (en)
Inventor
Willem Antonie Fischer
Original Assignee
Willem Antonie Fischer
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 Willem Antonie Fischer filed Critical Willem Antonie Fischer
Publication of WO1986002157A1 publication Critical patent/WO1986002157A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/28—Structurally-combined illuminating devices
    • G—PHYSICS
    • G12—INSTRUMENT DETAILS
    • G12B—CONSTRUCTIONAL DETAILS OF INSTRUMENTS, OR COMPARABLE DETAILS OF OTHER APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G12B11/00—Indicating elements; Illumination thereof

Definitions

  • the invention relates to a device for the illumination, by means of light sources, of a dial of a measuring instrument that is provided with a protective window placed at some distance in front of the dial.
  • Illumination devices for, for instance, dashboard instruments in vehicles; in which devices the light sources, usually common incandescent lamps, are placed behind the dial, are generally known.
  • the disadvantage of this method of illumination is that a large propor- tion of the light emitted by the light source is lost, so that a considerable part of the energy consumption, which can be very high in the case of incandescent lamps, does not come to the benefit of the aim pursued.
  • vehicles with a power source of their own, for instance cars this is merely a nuisance, but with vehicles that are dependent on wind etc, for instance sailing vessels and balloons, it is a great disadvantage when energy is drawn from e.g. batteries or power packs without a useful purpose.
  • the invention aims to provide an improved system for illuminating measuring instruments that does not entail the drawbacks mentioned above.
  • light sources are placed between the dial and the protective window.
  • LED's in particular of LED's that can produce a directed beam. These LED's have a long service life, while their electricity consumption is very low. This extremely low energy consumption renders the illumination of measuring instruments according to the invention particularly suitable for vehicles that do not have a power source of their own.
  • the directed light sources at important loca- tions on the dial, e.g.
  • the dial can be divided into clearly discernible zones, for instance a safe zone illuminated by a green light source, an approaching unsafe zone illuminated by a yellow light source, and an unsafe zone illuminated by a red light source.
  • FIG. 1 shows a top view of an embodiment according to the invention, comprising five light sources
  • fig. 2 shows a side view in section along the line II-II in fig. 1;
  • fig. 3 shows a different embodiment according to the invention, in cross-section
  • fig. 4 shows a cross-section of a pointer of a measuring instrument that is suitable for illumination according to the invention
  • fig. 5 shows a cross-section of a different embodiment of a pointer of an instrument that is suitable for illumination according to the invention
  • fig. 6 shows a cross-section of a different embodiment of a pointer of a measuring instrument that is suitable for illumination according to the invention.
  • fig. 7 shows an electric power supply circuit suitable for use in the device according to the invention.
  • fig. 1 the face of a measuring instrument is shown with indications 2 on the dial 1.
  • a pointer 3 takes care of the indication of the measured value.
  • a rim 4 is mounted on the dial 1 in which holes 5 are provided in such a way that the centre line of a light beam 6 emitted by an LED 7 that is placed in a hole 5, runs through the centre of the dial, whether or not perpen ⁇ dicular to the dial.
  • FIG. 2 shows holes 5 that are directed parallel to the surface of the dial.
  • fig. 3 the holes are directed at an angle in such a way that the centre line of the light beam is inclined towards the dial.
  • the rim 4 in which the holes 5 that serve to accommo ⁇ date the LED's 7 are provided should prevent light scattering as much as possible, so that the total amount of light produced will sweep across the dial.
  • the rim 4 may be made of an opaque, preferably dark, material.
  • This material may, for instance, be a plastic in which a black, or at least dark, filler is incorporated, a suitable plastic being e.g. high-density polyethylene, or a metal or alloy. In the latter case the rim itself may also be part of the electric power supply circuit.
  • the rim 4 is made of a plastic, it may.be manufac ⁇ tured by, for instance, injection moulding, during which process the holes 5 for accommodating the LED's 7 may be formed at the same time by using mould inserts. This is also possible when the rim 4 is made of a metal or an alloy that can be suitably processed by this shaping technique, e.g. aluminium alloys.
  • Figures 4, 5 and 6 show different embodiments of cross-sections of pointers that are suitable for use in a device according to the invention.
  • the oblong pointer is provided with a conti- nuous or discontinuous arch or kink directed at the protective window.
  • the pointer is semi- circular, or at least provided with a rounding, while the pointer in fig. 5 shows a single kink and the pointer in fig. 6 two kinks.
  • each LED 7 is connected in series to a resis ⁇ tor 9, so that the LED's are protected from tension peaks, while all LED's 7 are connected in parallel. It is possible to adjust the light emission of the LED's 7 by means of an adjustable resistor 10.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Details Of Measuring Devices (AREA)

Abstract

Dispositif d'éclairage, à l'aide de sources lumineuses, d'un cadran d'un instrument de mesure pourvu d'une fenêtre de protection placée à une certaine distance devant le cadran, la source lumineuse étant disposée entre le cadran et la fenêtre de protection.
PCT/NL1985/000038 1984-10-02 1985-10-01 Eclairage d'instruments de mesure WO1986002157A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8403000 1984-10-02
NL8403000A NL8403000A (nl) 1984-10-02 1984-10-02 Meetinstrumentverlichting.

Publications (1)

Publication Number Publication Date
WO1986002157A1 true WO1986002157A1 (fr) 1986-04-10

Family

ID=19844547

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1985/000038 WO1986002157A1 (fr) 1984-10-02 1985-10-01 Eclairage d'instruments de mesure

Country Status (3)

Country Link
EP (1) EP0197979A1 (fr)
NL (1) NL8403000A (fr)
WO (1) WO1986002157A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091214A (en) * 1961-07-18 1963-05-28 United Aircraft Corp Multicolor instrument
FR2309016A1 (fr) * 1975-04-24 1976-11-19 Jaeger Montage etanche pour lampe d'eclairage d'un appareil indicateur de mesure
US4217625A (en) * 1978-10-27 1980-08-12 Mcdonnell Douglas Corporation Lighted instrument dial face display
US4297681A (en) * 1980-08-11 1981-10-27 Dircksen Arnold D Electroluminescent ring light adapter for aircraft instruments

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091214A (en) * 1961-07-18 1963-05-28 United Aircraft Corp Multicolor instrument
FR2309016A1 (fr) * 1975-04-24 1976-11-19 Jaeger Montage etanche pour lampe d'eclairage d'un appareil indicateur de mesure
US4217625A (en) * 1978-10-27 1980-08-12 Mcdonnell Douglas Corporation Lighted instrument dial face display
US4297681A (en) * 1980-08-11 1981-10-27 Dircksen Arnold D Electroluminescent ring light adapter for aircraft instruments

Also Published As

Publication number Publication date
NL8403000A (nl) 1986-05-01
EP0197979A1 (fr) 1986-10-22

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