EP1667492A1 - Anzeigelicht für elektrische, elektronische und ähnliche Geräte - Google Patents

Anzeigelicht für elektrische, elektronische und ähnliche Geräte Download PDF

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Publication number
EP1667492A1
EP1667492A1 EP04425895A EP04425895A EP1667492A1 EP 1667492 A1 EP1667492 A1 EP 1667492A1 EP 04425895 A EP04425895 A EP 04425895A EP 04425895 A EP04425895 A EP 04425895A EP 1667492 A1 EP1667492 A1 EP 1667492A1
Authority
EP
European Patent Office
Prior art keywords
led
status indicator
resistor
diode
lighted
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Withdrawn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
EP04425895A
Other languages
English (en)
French (fr)
Inventor
Antonio Coppola
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.)
Signal Lux MDS Srl
Original Assignee
Signal Lux MDS Srl
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 Signal Lux MDS Srl filed Critical Signal Lux MDS Srl
Priority to EP04425895A priority Critical patent/EP1667492A1/de
Publication of EP1667492A1 publication Critical patent/EP1667492A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to a lighted status indicator for electric, electronic and similar equipment.
  • a lighted status indicator has the function of making a user aware of the state of electric or electronic equipment: for example, a green light may indicate a correct operation, a red light a failure, etc..
  • Lighted indicators of the type in reference are present on household appliances, such as refrigerators and vacuum cleaners, on light switches, on personal computers.
  • a first type of light source may consist of microlamps of a 3-6 mm diameter which contain a gas and in which an electric discharge takes place.
  • microlamps are connected in an alternating-current circuit the supply voltage of which, included between standard values of 110V and 380V at 50 Hz, is reduced to the necessary flashover voltage of said microlamps, usually of about 90V, by an appropriate resistor having a resistance of a value approximately included between 48 and 270Kohm.
  • microlamps are able to supply a light intensity of about 8-13 millicandles (mcd) and have an average lifetime of about 15 thousand hours.
  • the average lifetime of said microlamps can be inappropriate for some applications, also because brightness of same has a tendency to be reduced with use, due to formation of deposits on the inner surface of the small transparent bulbs forming the lamp bodies, and to lose steadiness due to arising of flickering phenomena.
  • a second type of light source which is based on use of LEDs, i.e. light-emitting diodes, of the type capable of supplying a light intensity of about 10mcd.
  • LEDs not only offer availability of a wide range of colours among which white, but also have an average lifetime of about 50 thousand hours, i.e. a lifetime that is more than three times higher than the lifetime of gas-discharge microlamps, while maintaining a steady light with a constant intensity.
  • the capacitor and first resistor perform the function of reducing voltage and current to the values required by the LED, 2V and 20mA (milliampere) for example, whereas the second resistor and second diode discharge possible voltage peaks present in the network.
  • the technical task underlying the present invention is to devise a lighted status indicator for electric, electronic and similar equipment that is capable of substantially obviating the mentioned drawbacks.
  • a lighted status indicator that, in addition to enabling a constantly steady light emission devoid of flickering phenomena, which can be of any colour and therefore also white, is of very high useful lifetime too, much higher than that obtainable with standard LEDs, but at much more reduced production costs as compared with those of said LEDs.
  • the lighted status indicator in accordance with the invention is generally identified with reference numeral 1.
  • It comprises at least one LED 2 of the super bright type, also called “high-efficiency LED", that, as known, is able to ensure an average duration of about three hundred thousand hours.
  • LED 2 can be selected from the LEDs of the above mentioned type with a diameter of 3 to 5 mm and characterised by a maximum light emission included between 50 and 16000 mcd when said LEDs are passed through by a standard current intensity of about 20mA.
  • LED 2 is submitted to passage of a current therethrough which has an operating intensity equal to a fraction of said standard intensity obtained by a simple feeding circuit 3.
  • an operating current intensity is a light intensity that is reduced to few units or some tens of millicandles adapted for use in the indicators being the object of the invention.
  • the feeding circuit comprises a resistor 4 and a diode 5 consisting of components provided with rheophores (see Fig. 2) or disposed internally of an integrated circuit (see Fig. 1) and consisting of components suitable for surface mounting.
  • Diode 5 is set in parallel with respect to LED 2; in the preferred and illustrated form, resistor 4 is set in series with respect to the parallel between diode 5 and LED 2.
  • resistor 4 may have a resistance included between 50 and 200Kohm, preferably of about 120kohm.
  • LED 2 preferably selected from LEDs with a 3 mm diameter and capable of approximately supplying a 340mcd current with 20mA, is in this case passed through by an operating current intensity of few milliamperes.
  • the current intensity is included between 0.2 and 5mA.
  • the current intensity is of about 1mA to which, just as an indication, a light emission of 17mcd corresponds, which value is adequate for a standard status indicator.
  • the invention achieves important advantages.
  • the status indicator in accordance with the invention has a very high operating lifetime, without any reduction in light emission, not only higher than that of indicators with gas-discharge microlamps, but also higher than when light sources formed of LEDs of standard type are used, which LEDs in any case cannot be used for said status indicators due to their sizes.
  • the status indicator in accordance with the invention comprises a very simple feeding circuit, only formed of one diode and one resistor.
  • This structural simplicity is made possible by the fact that operation of said LED takes place with a much lower current intensity than that considered as the standard operating current and therefore under operating conditions that do not require additional components to protect the LED from possible voltage and current peaks present in the network, and this practically results in very reduced and competitive production costs as compared with other types of status indicators.
EP04425895A 2004-11-26 2004-11-26 Anzeigelicht für elektrische, elektronische und ähnliche Geräte Withdrawn EP1667492A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04425895A EP1667492A1 (de) 2004-11-26 2004-11-26 Anzeigelicht für elektrische, elektronische und ähnliche Geräte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425895A EP1667492A1 (de) 2004-11-26 2004-11-26 Anzeigelicht für elektrische, elektronische und ähnliche Geräte

Publications (1)

Publication Number Publication Date
EP1667492A1 true EP1667492A1 (de) 2006-06-07

Family

ID=34932919

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425895A Withdrawn EP1667492A1 (de) 2004-11-26 2004-11-26 Anzeigelicht für elektrische, elektronische und ähnliche Geräte

Country Status (1)

Country Link
EP (1) EP1667492A1 (de)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991006078A1 (en) * 1989-10-11 1991-05-02 Choi Robert S Battery-powered flashing superluminescent light emitting diode safety warning light
US5856779A (en) * 1995-06-08 1999-01-05 Friday; Leon L. Motorcycle brake light enhancement system
WO1999039319A2 (en) * 1998-01-29 1999-08-05 Ledi-Lite Ltd. Illuminated sign system
US20020075677A1 (en) * 2000-11-02 2002-06-20 Hans Dokoupil Night light
US20020101730A1 (en) * 2001-01-29 2002-08-01 Wessel-Werk Gmbh Suction head for a sucton cleaning device
DE20214661U1 (de) * 2002-09-06 2002-12-05 Signal Construct Elektro Optis Soffittenlampe
US20030169178A1 (en) * 2002-02-15 2003-09-11 Jensen Bradford B. Marker lights for wireless doorbell transmitters and other devices
US20040141318A1 (en) * 2000-09-29 2004-07-22 Suncor Stainless, Inc. Super bright led utility and emergency light

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991006078A1 (en) * 1989-10-11 1991-05-02 Choi Robert S Battery-powered flashing superluminescent light emitting diode safety warning light
US5313187A (en) * 1989-10-11 1994-05-17 Bell Sports, Inc. Battery-powered flashing superluminescent light emitting diode safety warning light
US5856779A (en) * 1995-06-08 1999-01-05 Friday; Leon L. Motorcycle brake light enhancement system
WO1999039319A2 (en) * 1998-01-29 1999-08-05 Ledi-Lite Ltd. Illuminated sign system
US20040141318A1 (en) * 2000-09-29 2004-07-22 Suncor Stainless, Inc. Super bright led utility and emergency light
US20020075677A1 (en) * 2000-11-02 2002-06-20 Hans Dokoupil Night light
US20020101730A1 (en) * 2001-01-29 2002-08-01 Wessel-Werk Gmbh Suction head for a sucton cleaning device
US20030169178A1 (en) * 2002-02-15 2003-09-11 Jensen Bradford B. Marker lights for wireless doorbell transmitters and other devices
DE20214661U1 (de) * 2002-09-06 2002-12-05 Signal Construct Elektro Optis Soffittenlampe

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