EP0246614A2 - Einrichtung und Verfahren zum Prüfen von Glühlampen mit Glasbirne - Google Patents

Einrichtung und Verfahren zum Prüfen von Glühlampen mit Glasbirne Download PDF

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Publication number
EP0246614A2
EP0246614A2 EP87107273A EP87107273A EP0246614A2 EP 0246614 A2 EP0246614 A2 EP 0246614A2 EP 87107273 A EP87107273 A EP 87107273A EP 87107273 A EP87107273 A EP 87107273A EP 0246614 A2 EP0246614 A2 EP 0246614A2
Authority
EP
European Patent Office
Prior art keywords
lamps
testing
luminosity
detector means
testing apparatus
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
EP87107273A
Other languages
English (en)
French (fr)
Other versions
EP0246614A3 (en
EP0246614B1 (de
Inventor
Giuliano Monai
Antonio Boscolo
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.)
Zeltron Istituto Zanussi per la Ricerca SpA
Original Assignee
Zeltron Istituto Zanussi per la Ricerca SpA
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 Zeltron Istituto Zanussi per la Ricerca SpA filed Critical Zeltron Istituto Zanussi per la Ricerca SpA
Publication of EP0246614A2 publication Critical patent/EP0246614A2/de
Publication of EP0246614A3 publication Critical patent/EP0246614A3/en
Application granted granted Critical
Publication of EP0246614B1 publication Critical patent/EP0246614B1/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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/20—Responsive to malfunctions or to light source life; for protection

Definitions

  • the present invention relates to apparatus for testing incandescent lamps having a glass bulb.
  • the invention also relates to a method for testing such lamps.
  • the invention relates to the testing of low-voltage incandescent lamps, and is applicable to the testing of individual lamps, or to testing a plurality of such lamps disposed in a container such as in a blister pack.
  • This system is capable of automatically detecting the presence of incompletely filled blister packs or of blister packs containing at least one lamp having a damaged glass bulb or filament, to thereby permit such blister packs or individual lamps to be eliminated or replaced by the use of automatically operated equipment of a mechanical or pneumaticcally operated type.
  • the system according to the invention comprises means for processing signals generated by a telecamera operating in in infrared range for scanning the blister packs contain­ing the lamps.
  • the absence of any lamp, or the presence of a lamp having a broken or cracked bulb and/or a broken filament is detected by comparing the luminosity of the filament con­tained in an undamaged bulb to that of a filament which is exposed to atmosphere or broken.
  • a testing apparatus of the type defined above comprises: - a telecamera or other detector means of suitable charact­eristics operating in the infrared range, or an equi­valent device, - a transmitter device comprising a suitable radiating system capable of transmitting radio-frequency energy to the lamps, and - a processing, control and optionally display unit for programming and controlling the system and any optional systems for moving the blister packs or for automatic­ally substituting blister packs and/or lamps.
  • the apparatus according to the invention may be programmed for processing different types of lamps within a range permitted by the energy emitted by the transmitter and by the image processing capacity.
  • apparatus for testing incand­escent lamps having a glass bulb comprises means for moving said lamps relative to a testing station, and a processing and control unit for controlling said moving means.
  • the apparatus is characterized by comprising a radiating system adapted to transmit radio-frequency electromagnetic energy produced by generator means to said lamps when positioned at said testing station, and detector means operating in the infrared range and adapted to detect the luminosity of said lamps at said testing station and to apply a corresponding signal to said processing an control unit, the latter being adapted to compare said signal to a reference signal and to generate a correspond­ing control signal in a per se known manner.
  • the invention is also directed to a method for testing incandescent lamps having a glass bulb by the use of the above described apparatus, said method being characterized in that said lamps, when positioned at said testing stat­ion, are subjected to the action of a radio-frequency electromagnetic field of an intensity normally capable of inducing luminosity in the infrared range adjacent the limit of the visible range in the filament of each lamp, the luminosity of said lamps being detected by detector means for comparison to a reference value.
  • lamps 10 are contained in containers 11 such as blister packs supported on conveyor means 12.
  • the lamps 10 contained in blister packs 11 may all be of the same type or of different types, and may be contained in individual blisters in a selected alignment or at indeterminate orientations.
  • the invention permits the lamps contained in blister packs 11, and more generally any individual lamp 10, to be tested without any energizing or sensing devices coming into actual contact with the lamps.
  • Conveyor means 12 is actuated by motor means 13.
  • a proximity detector 17 signals a processing and control unit 19 adapted to control motor means 13.
  • processing and control unit 19 activates a radio-frequency generator 15, preferably of the type having a controlled power output, which cooperates with a radiating system 14 for transmitting radio-frequency energy to the location occupied by blister 11.
  • Processing and control unit 19 may be of any per se known type comprising for example at least one input/output unit, signal acquisition and processing means and a microprocessor of the type MVME 133 sold by Motorola Inc., and comprising a central processing unit CPU 68020.
  • the radiofrequency energy supplied to the location occupied by blister 11 excites the filaments of lamps 10.
  • the filaments of lamps 10 show a differ­ent response to the supply of energy of a given magnitude when broken (curve 22), when exposed to air (corve 23), i.e. when the glass bulb is cracked or broken, and whenn lamp 10 is undamaged (curve 24).
  • the inventors have ascertained that the difference in luminosity between a filament exposed to air (curve 23) and a filament in a vacuum (curve 24) is unequivocally discernible when the energy supplied to the lamp is of a magnitude whereat the temperature of the filament is just short of producing visible luminosity i.e. when the luminosity emitted by the filament is in the infrared range close to the limit of the visible range.
  • Infrared detector means 16 comprising for instance a telecamera responsive to radiation in the selected infrared range, or an array of photodiodes responsive to infrared radiation, is arranged to scan any location on blister pack 11 whereat a lamp 10 is, or should be, present.
  • detector means 16 transmitts to an interface 18 a series of signals indic­ative of the intensity of the infrared radiation emitted from the respective positions provided on the area of blister pack 11.
  • the intensity of the emitted radiation, and thus the respective signal remains below the determined threshold, it signifies that the respective position is not occupied by a lamp, or that the lamp occupying the position is deficient due to its bulb and/or filament being damaged.
  • the informations supplied to interface 18 are transmitted to processing and control unit 19 and processed thereby for determining the state of each lamp 10 on the base of the above criteria.
  • Processing and control unit 19 may be reset, controlled and programmed in a per se known manner by using a keyboard 20, optionally in combination with display means.
  • processing and control unit 19 may also generate control signals for activating a device 21 operable to automatically replace in blisetr pack 11 any lamps 10 having been found to be damaged.
  • detector means 16 may be designed to detect a determined value of luminosity varying for different types of lamps, so that, even when only one lamp is not excited, the respective value of luminosity is not attained, causing the detector means to report such inferior value.
  • the detector means may also be designed to detect the absence of excitation also in two or more lamps.

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  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
EP87107273A 1986-05-22 1987-05-19 Einrichtung und Verfahren zum Prüfen von Glühlampen mit Glasbirne Expired - Lifetime EP0246614B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT8336186 1986-05-22
IT83361/86A IT1204239B (it) 1986-05-22 1986-05-22 Dispositivo di controllo di lampade con bulbi in vetro e procedimento relativo

Publications (3)

Publication Number Publication Date
EP0246614A2 true EP0246614A2 (de) 1987-11-25
EP0246614A3 EP0246614A3 (en) 1989-03-15
EP0246614B1 EP0246614B1 (de) 1992-03-11

Family

ID=11320729

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87107273A Expired - Lifetime EP0246614B1 (de) 1986-05-22 1987-05-19 Einrichtung und Verfahren zum Prüfen von Glühlampen mit Glasbirne

Country Status (3)

Country Link
EP (1) EP0246614B1 (de)
DE (1) DE3777240D1 (de)
IT (1) IT1204239B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3935557A1 (de) * 1988-10-26 1990-05-03 Toshiba Kk Vorrichtung zur lebensdauergrenzenbestimmung einer lichtquelle bei einem bilderzeugungsgeraet
EP0434859A1 (de) * 1989-12-27 1991-07-03 Scheidt & Bachmann Gmbh Anordnung zur Überwachung der Funktionsfähigkeit einer Glühlampe

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2150372B (en) * 1983-11-25 1986-12-10 Ferranti Plc Lamp failure detector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3935557A1 (de) * 1988-10-26 1990-05-03 Toshiba Kk Vorrichtung zur lebensdauergrenzenbestimmung einer lichtquelle bei einem bilderzeugungsgeraet
EP0434859A1 (de) * 1989-12-27 1991-07-03 Scheidt & Bachmann Gmbh Anordnung zur Überwachung der Funktionsfähigkeit einer Glühlampe

Also Published As

Publication number Publication date
EP0246614A3 (en) 1989-03-15
EP0246614B1 (de) 1992-03-11
DE3777240D1 (de) 1992-04-16
IT1204239B (it) 1989-03-01
IT8683361A0 (it) 1986-05-22

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