Vehicle headlight with adjusting means for different traffic conditions

• US 5,938,319 A
• Filed: 06/17/1996
• Issued: 08/17/1999
• Est. Priority Date: 08/16/1995
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Hege, Guenter
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): DELGIZZI, RONALD ERNEST
• Application Number:
  US08/665,249
• Time in Patent Office: 1,156 Days
• Field of Search: 362/459, 362/466, 362/467, 362/513, 362/514
• US Class Current: 362/459
• CPC Class Codes: B60Q 1/00 Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor for lighting vehicle interior B60Q3/00
• CPC Class Codes: F21S 41/255 Lenses with a front view of circular or truncated circular outline
• CPC Class Codes: F21S 41/321 the reflector being a surface of revolution or a planar surface, e.g. truncated
• CPC Class Codes: F21S 41/365 successively reflecting the light
• CPC Class Codes: F21S 41/62 for adaptation between right-hand and left-hand traffic
• CPC Class Codes: F21S 41/675 by moving reflectors

Abstract

The headlight has a light source (10) and a reflector (12) by which light is reflected to a light guiding or deflecting device (18). The light guiding device (18) has a number, advantageousely from a few hundred to a hundred thousand, of individual reflecting elements (22) which are movable independently of each other between at least two different positions. Each reflecting element (22) is connected with an electrically operable adjusting element (26) which is controlled by a controller (30). The light reflected from the reflector (12) is reflectable from the light guide device (18) to form a light beam issuing from the lighting device. Reflected light from each reflecting element (22) in one of its positions forms a part of the light beam and does not contribute to the light beam in one of its other positions. Predetermined portions of the light beam can be switched on or off by controlling the individual light reflecting elements (22) and thus can change the characteristics of the light beam issuing from the lighting device.

Claims

1. An adjustable headlight for a vehicle comprising

at least one light source (10),

at least one reflector (12) by which light issuing from the at least one light source (10) is reflected along a light path, and

adjustable reflecting means (18) for forming a light beam illuminating a region in front of the vehicle from said light reflected along said light path by said at least one reflector (12);

wherein said adjustable reflecting means (18) comprises a plurality of individual adjustable reflecting elements (22) and means for moving said adjustable reflecting elements independently of each other between at least two predetermined positions to adjust said light beam for different conditions present in front of the vehicle;

whereby the headlight is adjustable for both right hand traffic and left hand traffic.

2. The adjustable headlight as defined in claim 1, wherein each of said adjustable reflecting elements (22) in at least one of said at least two predetermined positions reflects said light to form a part of said light beam and in at least one other of said at least two predetermined positions reflects said light so as not to contribute to said light beam.

3. The adjustable headlight as defined in claim 1, wherein each of said adjustable reflecting elements is at least approximately planar.

4. The adjustable headlight as defined in claim 1, wherein said means for moving said adjustable reflecting elements (22) comprises a plurality of electromagnetically-operated adjusting elements (26) coupled to said reflecting elements (22), wherein each of said electromagnetically-operated adjusting elements (26) is coupled to a different one of said reflecting elements (22) for control of said reflecting elements independently of each other.

5. The adjustable headlight as defined in claim 4, wherein said means for moving said adjustable reflecting elements (22) includes an electrical controller (30) including means for activating each of said adjusting elements (26) independently of each other.

6. The adjustable headlight as defined in claim 1, wherein said means for moving said adjustable reflecting elements (22) comprises a plurality of piezoelectrically-operating adjusting elements (28) linked to said reflecting elements (22), wherein each of said piezoelectrically-operating adjusting elements (28) is linked to a different one of said reflecting elements (22) for control of said reflecting elements independently of each other.

7. The adjustable headlight as defined in claim 6, wherein said means for moving said adjustable reflecting elements (22) includes an electrical controller (30) including means for activating each of said adjusting elements (28) independently of each other.

8. The adjustable headlight as defined in claim 1, further comprising at least one lens (20) arranged to receive light reflected from the reflecting elements (22).

9. The adjustable headlight as defined in claim 8, wherein each of said adjustable reflecting elements (22) is movable between a first position in which the light reflected from the reflecting elements (22) passes through said at least one lens (20) and a second position in which the light reflected from the reflecting elements (22) does not pass through the at least one lens (20).

10. The adjustable headlight as defined in claim 2, further comprising means for controlling a dwell time of said reflecting elements in said at least one position in which said light is reflected to form said part of said light beam according to a predetermined average light intensity to be produced in said part of said light beam and means for controlling a time interval between different ones of said at least one position so that said time interval is shorter than each of said dwell times.

11. The adjustable headlight as defined in claim 10, further comprising means for varying said dwell time and said time intervals between said at least two predetermined positions of said reflecting elements.

12. The adjustable headlight as defined in claim 1, further comprising means for illuminating each of the adjustable reflecting elements (22) with different light intensities of the reflected light from the at least one reflector (12) and wherein the ones of the reflecting elements (22) illuminated with the greatest light intensities form a predetermined portion of the light beam illuminating a region comparatively far in front of the vehicle.

13. The adjustable headlight as defined in claim 12, further comprising means for moving the reflecting means (18) as a whole for deflecting the light reflected from the at least one reflector (12) to change a propagation direction of said light.

14. The adjustable headlight as defined in claim 12, further comprising a switching element for arbitrarily activating motion of the reflecting elements (22) between said at least two predetermined positions.

15. The adjustable headlight as defined in claim 1, further comprising means for controlling said reflecting elements (22) including means for automatically measuring at least one parameter characteristic of at least one of a traffic situation, a weather condition and a vehicle speed of the vehicle containing the headlight and means for moving the reflecting elements into a selected one of the at least two predetermined positions according to said at least one parameter.

16. The adjustable headlight as defined in claim 10, further comprising means for detecting and processing a traffic situation in front of the vehicle to provide a control signal, said means for detecting and processing including sensor means (34) for detecting one portion of said traffic situation after the other and means for synchronizing motions of said reflecting elements (22) and the sensor means (34) so that said portion of said traffic situation detected by said sensor means is immediately illuminated by said light beam.