GB746126A - Improvements relating to electrical systems for automatically dimming automobile headlamps - Google Patents

Improvements relating to electrical systems for automatically dimming automobile headlamps

Info

Publication number
GB746126A
GB746126A GB4890/54A GB489054A GB746126A GB 746126 A GB746126 A GB 746126A GB 4890/54 A GB4890/54 A GB 4890/54A GB 489054 A GB489054 A GB 489054A GB 746126 A GB746126 A GB 746126A
Authority
GB
United Kingdom
Prior art keywords
headlamps
circuit
switch
amplifier
photo
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.)
Expired
Application number
GB4890/54A
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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 Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of GB746126A publication Critical patent/GB746126A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1415—Dimming circuits
    • B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/40—Indexing codes relating to other road users or special conditions
    • B60Q2300/42—Indexing codes relating to other road users or special conditions oncoming vehicle

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

746,126. Photo-electric headlamp dimming systems. GENERAL MOTORS CORPORATION. Feb. 19, 1954 [March 5, 1953], No. 4890/54. Addition to 712,740. Class 40 (3). The invention is an improvement in the headlamp dimming system claimed in the parent Specification, in which a photo-electric cell responsive to light from the headlamps of an oncoming vehicle developed a voltage across means in the grid circuit of an amplifier tube to control the dimming switch and in which part of the means was shunted out to increase the amplifier sensitivity when the headlamps were dimmed. According to the present invention a manual over-riding switch is provided which does not affect the condition of the automatic circuit. As shown, light from the headlamps of the oncoming vehicle increases the current in the photo-sensitive device 50 developing a voltage across series resistors 54, 56, 58 of which 56 and 58 are, in the undimmed condition, shortcircuited. The current in amplifier tube 40 decreases until relay 68 is no longer able to hold its contact against the action of spring 46. This contact completes the circuit of a further relay 14 through a foot switch 6, normally in the position shown, and the overriding switch 84 which is closed for automatic operation of the system, to change the headlamps from "light" to " dim." At the same time the short-circuit is removed from sections 58 and 56 of the grid resistors of tube 40 increasing the sensitivity of the amplifier so that, if the oncoming vehicle also dims its headlamps, the circuit does not immediately return to "bright." The overriding switch 84 is placed in series with the foot switch 6 and enables relay 14 to be de-energized restoring the headlamps to " bright."
GB4890/54A 1953-03-05 1954-02-19 Improvements relating to electrical systems for automatically dimming automobile headlamps Expired GB746126A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US746126XA 1953-03-05 1953-03-05

Publications (1)

Publication Number Publication Date
GB746126A true GB746126A (en) 1956-03-07

Family

ID=22120532

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4890/54A Expired GB746126A (en) 1953-03-05 1954-02-19 Improvements relating to electrical systems for automatically dimming automobile headlamps

Country Status (2)

Country Link
DE (1) DE950432C (en)
GB (1) GB746126A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910621A (en) * 1956-03-01 1959-10-27 Bosch Gmbh Robert Electrical lighting arrangement

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE594700C (en) * 1931-11-14 1934-03-21 Serge Vasilache Device for automatic switching of the motor vehicle headlights
FR954185A (en) * 1947-10-10 1949-12-20 Advanced lighting device for motor vehicles
CH275305A (en) * 1949-12-27 1951-05-15 Gmbh Teleautomatic Automatic dimming device for motor vehicles.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2910621A (en) * 1956-03-01 1959-10-27 Bosch Gmbh Robert Electrical lighting arrangement

Also Published As

Publication number Publication date
DE950432C (en) 1956-10-11

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