| 摘要 |
1,190,010. Vehicle lighting system. JOSEPH LUCAS (INDUSTRIES) Ltd. Oct. 26, 1967 [Nov. 14, 1966], No. 50876/66. Heading G1A. A vehicle headlamp system in which a shutter is moved in front of the headlamp beam in response to the detection of light from an oncoming vehicle, is adapted for use both in countries having a left hand rule of the road and countries having a right hand rule of the road. Light from an oncoming vehicle is focussed by lens 19 into an aperture 22 and by lens 24 on to a photo-cell 25. The cell output is amplified and applied to the winding of a "milliammeter" in which the pointer is replaced by a pulley wheel. This is caused to pull a cable and move shutters 18, 18a across the aperture 15 in such a direction that one of the shutters cuts off part of the headlamp beam from filament 12. The direction is selected in dependence upon the rule of the road of the country in which the vehicle is being driven and is chosen by switching a reversing switch, connected between the photo-cell amplifier and the "milliammeter", into the appropriate one of two positions. As well as movement of shutters 18, 18a, shutters 27, 27a are moved in the same direction across the photocell field of view. Slight oscillation of both sets of shutters occurs before a final position is attained in which the light issuing from the headlamp is so directed as to prevent dazzling of the oncoming vehicle's driver. Eddy current damping of the movement of the shutters and damping of the "milliammeter" are also provided. The leading edge of a shutter 18, 18a is in advance of a shutter 27, 27a to ensure that the oncoming driver's eyes are always in shadow. To prevent shutter movement due to reflection of the headlamp beam from an oncoming vehicle, red and infra-red wavelengths may be filtered out of the spectrum of the headlamp beam and the photocell be principally sensitive to such wavelengths. |
