GB816668A - Improvements relating to automatic headlamp dimming apparatus - Google Patents

Improvements relating to automatic headlamp dimming apparatus

Info

Publication number
GB816668A
GB816668A GB36010/57A GB3601057A GB816668A GB 816668 A GB816668 A GB 816668A GB 36010/57 A GB36010/57 A GB 36010/57A GB 3601057 A GB3601057 A GB 3601057A GB 816668 A GB816668 A GB 816668A
Authority
GB
United Kingdom
Prior art keywords
valve
relay
cell
transistor
headlights
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
GB36010/57A
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 GB816668A publication Critical patent/GB816668A/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
    • B60Q2300/05—Special features for controlling or switching of the light beam
    • B60Q2300/052—Switching delay, i.e. the beam is not switched or changed instantaneously upon occurrence of a condition change
    • 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

816,668. Automatic headlamp dimming apparatus. GENERAL MOTORS CORPORATION. Nov. 19, 1957 [Dec. 5, 1956], No. 36010/57. Class 40 (3). Vehicle headlight dimming apparatus which is operated by the lights of an approaching vehicle, comprises a photo-cell 80, valve T-1 and transistor A and B amplifiers and relays 52 and 18 which switch the headlights from high to low intensity when the light incident on the cell reaches a predetermined value. The headlamps 2 and 4 each contain two filaments, high beam 10 and 12 and low beam 6 and 8. The heavy duty relay 18 controls the power circuit to each filament and is itself controlled by the relay 52 when the switch 34 is in the position shown. With no incident light the high resistance of cell 80 in conjunction with resistance 86 maintains the grid of the second part of valve T-1 at earth potential. The valve is cut off by the positive cathode bias applied via the potentiometer 130, hence no base or collector current flows in the transistor A. The very small voltage drop across resistor 122 produces a high base and collector current in transistor B which operates the relay 52 and hence the relay 18, switching the headlights to high beam. When the light incident on the cell increases to a level which allows the valve to conduct the process is reversed and the headlights switched to the dim position. At the same time the bias on the valve is decreased by disconnecting R64 from the power supply, this increases the sensitivity of the amplifier and prevents a change back to high beam when the approaching vehicle dims its lights. The lamps can at any time be switched to high beam by operating the foot switch 34. In a further arrangement (Fig. 2, not shown) feedback is used to increase the speed of operation of the system.
GB36010/57A 1956-12-05 1957-11-19 Improvements relating to automatic headlamp dimming apparatus Expired GB816668A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US816668XA 1956-12-05 1956-12-05

Publications (1)

Publication Number Publication Date
GB816668A true GB816668A (en) 1959-07-15

Family

ID=22165605

Family Applications (1)

Application Number Title Priority Date Filing Date
GB36010/57A Expired GB816668A (en) 1956-12-05 1957-11-19 Improvements relating to automatic headlamp dimming apparatus

Country Status (1)

Country Link
GB (1) GB816668A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133532A (en) * 1983-01-10 1984-07-25 Guilherme Ysenbout Mogas Light sensitive switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2133532A (en) * 1983-01-10 1984-07-25 Guilherme Ysenbout Mogas Light sensitive switch

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