EP1583398A1 - Zustandsleuchtanzeiger für elektrische, elektronische und ähnliche Geräte - Google Patents

Zustandsleuchtanzeiger für elektrische, elektronische und ähnliche Geräte Download PDF

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Publication number
EP1583398A1
EP1583398A1 EP04425118A EP04425118A EP1583398A1 EP 1583398 A1 EP1583398 A1 EP 1583398A1 EP 04425118 A EP04425118 A EP 04425118A EP 04425118 A EP04425118 A EP 04425118A EP 1583398 A1 EP1583398 A1 EP 1583398A1
Authority
EP
European Patent Office
Prior art keywords
microindicator
led
resistor
lighted
diode
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.)
Granted
Application number
EP04425118A
Other languages
English (en)
French (fr)
Other versions
EP1583398B1 (de
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 AT04425118T priority Critical patent/ATE308223T1/de
Priority to DE602004000161T priority patent/DE602004000161T2/de
Priority to ES04425118T priority patent/ES2249755T3/es
Priority to EP04425118A priority patent/EP1583398B1/de
Publication of EP1583398A1 publication Critical patent/EP1583398A1/de
Application granted granted Critical
Publication of EP1583398B1 publication Critical patent/EP1583398B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B45/37—Converter circuits

Definitions

  • the present invention relates to a lighted microindicator for electric, electronic and similar equipment.
  • a lighted microindicator 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 microindicator for electric, electronic and similar equipment that is capable of substantially obviating the mentioned drawbacks.
  • a lighted microindicator that is characterised in that it comprises at least one LED of the high-light-emission type and one feeding circuit adapted to submit said LED to passage of a current therethrough that has an operating intensity equal to a fraction of the standard intensity provided for operation of the same LED under conditions of maximum light emission.
  • the lighted microindicator in accordance with the invention is generally identified with reference numeral 1.
  • It comprises at least one LED 2 of the high-light-emission 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 set in series with respect to LED 2 and consisting of non rheophore components (see Fig. 2) or disposed internally of an integrated circuit (see Fig. 1) and consisting of components suitable for surface mounting.
  • 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 microindicator.
  • the invention achieves important advantages.
  • the microindicator 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 microindicators due to their sizes.
  • the microindicator 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 microindicators.
  • microindicators have a tendency to heat up to a very reduced extent.
  • microindicators in accordance with the invention can be such produced that they give rise to light emissions of any colour.

Landscapes

  • Illuminated Signs And Luminous Advertising (AREA)
  • Audible And Visible Signals (AREA)
  • Led Devices (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Filters And Equalizers (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP04425118A 2004-02-26 2004-02-26 Zustandsleuchtanzeiger für elektrische, elektronische und ähnliche Geräte Expired - Lifetime EP1583398B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT04425118T ATE308223T1 (de) 2004-02-26 2004-02-26 Zustandsleuchtanzeiger für elektrische, elektronische und ähnliche geräte
DE602004000161T DE602004000161T2 (de) 2004-02-26 2004-02-26 Zustandsleuchtanzeiger für elektrische, elektronische und ähnliche Geräte
ES04425118T ES2249755T3 (es) 2004-02-26 2004-02-26 Indicador luminoso de estado de funcionamiento para equipo electrico, electronico y similares.
EP04425118A EP1583398B1 (de) 2004-02-26 2004-02-26 Zustandsleuchtanzeiger für elektrische, elektronische und ähnliche Geräte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425118A EP1583398B1 (de) 2004-02-26 2004-02-26 Zustandsleuchtanzeiger für elektrische, elektronische und ähnliche Geräte

Publications (2)

Publication Number Publication Date
EP1583398A1 true EP1583398A1 (de) 2005-10-05
EP1583398B1 EP1583398B1 (de) 2005-10-26

Family

ID=34878366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425118A Expired - Lifetime EP1583398B1 (de) 2004-02-26 2004-02-26 Zustandsleuchtanzeiger für elektrische, elektronische und ähnliche Geräte

Country Status (4)

Country Link
EP (1) EP1583398B1 (de)
AT (1) ATE308223T1 (de)
DE (1) DE602004000161T2 (de)
ES (1) ES2249755T3 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018216297A1 (de) * 2018-09-25 2020-03-26 BSH Hausgeräte GmbH Beleuchtungsschaltung für ein elektrisches Gerät

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5313187A (en) * 1989-10-11 1994-05-17 Bell Sports, Inc. Battery-powered flashing superluminescent light emitting diode safety warning light
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
US20020126491A1 (en) * 2001-03-08 2002-09-12 Chih-Min Chen LED light bulb with threaded base
US20020140379A1 (en) * 2000-12-20 2002-10-03 Daniel Chevalier Lighting device
DE20214661U1 (de) * 2002-09-06 2002-12-05 Signal Construct Elektro Optis Soffittenlampe
US6543904B1 (en) * 1996-10-30 2003-04-08 Mannesmann Vdo Ag Display panel with a luminous display field
US6614358B1 (en) * 2000-08-29 2003-09-02 Power Signal Technologies, Inc. Solid state light with controlled light output

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5313187A (en) * 1989-10-11 1994-05-17 Bell Sports, Inc. Battery-powered flashing superluminescent light emitting diode safety warning light
US6543904B1 (en) * 1996-10-30 2003-04-08 Mannesmann Vdo Ag Display panel with a luminous display field
WO1999039319A2 (en) * 1998-01-29 1999-08-05 Ledi-Lite Ltd. Illuminated sign system
US6614358B1 (en) * 2000-08-29 2003-09-02 Power Signal Technologies, Inc. Solid state light with controlled light output
US20020075677A1 (en) * 2000-11-02 2002-06-20 Hans Dokoupil Night light
US20020140379A1 (en) * 2000-12-20 2002-10-03 Daniel Chevalier Lighting device
US20020126491A1 (en) * 2001-03-08 2002-09-12 Chih-Min Chen LED light bulb with threaded base
DE20214661U1 (de) * 2002-09-06 2002-12-05 Signal Construct Elektro Optis Soffittenlampe

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
LUMILEDS APPLICATION BRIEF: "Reliability Considerations for SuperFlux LEDs", 1 September 2002, LUMILEDS, SAN JOSE, CA, USA, XP002286537 *
LUMILEDS TECHNICAL DATASHEET: "SuperFlux LEDs", 11 July 2002, LUMILEDS, SAN JOSE, CA, USA, XP002286538 *

Also Published As

Publication number Publication date
EP1583398B1 (de) 2005-10-26
ES2249755T3 (es) 2006-04-01
DE602004000161T2 (de) 2006-07-13
ATE308223T1 (de) 2005-11-15
DE602004000161D1 (de) 2005-12-15

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