Rearview mirror assembly construction

• US 20020171954A1
• Filed: 03/25/2002
• Published: 11/21/2002
• Est. Priority Date: 05/21/2001
• Status: Active Grant

• Current Assignee: Gentex Corporation
• Original Assignee: Gentex Corporation
• Inventors: Bauer, Frederick T., Bonardi, Timothy A.
• Granted Patent: US 6,657,767 B2
• Time in Patent Office: Days
• US Class Current: 359/877
• CPC Class Codes: B60Q 1/2665 on rear-view mirrors lighting devices for vehicle interior on or for rear-view mirrors B60Q3/258
• CPC Class Codes: B60R 1/07 by electrically powered actuators
• CPC Class Codes: B60R 1/088 using a cell of electrically changeable optical characteristic, e.g. liquid-crystal or electrochromic mirrors
• CPC Class Codes: B60R 1/1207 with lamps; with turn indicators
• CPC Class Codes: H05K 1/02 Details
• CPC Class Codes: H05K 1/18 Printed circuits structurally associated with non-printed electric components H05K1/0201, H05K1/023, H05K1/0243, and H05K1/16 take precedence
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/09072 Hole or recess under component or special relationship between hole and component
• CPC Class Codes: H05K 2201/09081 Tongue or tail integrated in planar structure, e.g. obtained by cutting from the planar structure
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 2201/10484 Obliquely mounted
• CPC Class Codes: H05K 3/0058 Laminating printed circuit boards onto other substrates, e.g. metallic substrates H05K1/0281 takes precedence

Abstract

A rearview mirror assembly of the present invention includes a circuit board disposed behind the mirror. The circuit board may be a flexible circuit board and may include an LED mounted to project light through a transparent window in the flexible circuit board and through the mirror. The flexible circuit board may function as a mirror heater and may include conductive paths for connection to the LED and/or electrodes of an electrochromic mirror. The LED may include an LED chip mounted directly on the circuit board and encapsulated thereon by an encapsulant.

Claims

1. A rearview mirror assembly for a vehicle comprising:

a mirror having a surface that is at least partially reflective;

a flexible circuit board disposed behind the surface of said mirror, said flexible circuit board having a first surface facing said mirror and a second surface opposite the first surface, said flexible circuit board further including a substantially transparent window; and

an LED mounted to said second surface of said flexible circuit board so as to project light through the transparent window in said flexible circuit board and through said mirror.

2. The rearview mirror assembly of claim 1, wherein said flexible circuit board includes a plurality of transparent windows, and the rearview mirror assembly further comprises a plurality of LEDs mounted to said second surface of said flexible circuit board so as to project light through the substantially transparent windows in said flexible circuit board and through said mirror.

3. The rearview mirror assembly of claim 1, wherein said substantially transparent window is an aperture extending through said flexible circuit board.

4. The rearview mirror assembly of claim 1, wherein said LED is mounted such that its optical axis is inclined relative to said second surface of said flexible circuit board.

5. The rearview mirror assembly of claim 1, wherein said flexible circuit board further includes at least first and second vias extending between the first and second surfaces, said LED having at least a first lead and a second lead and being positioned on said flexible circuit board such that the optical axis of said LED is inclined relative to the first surface of said flexible circuit board with the first lead of said LED inserted through said first via and the second lead abutting the first surface of said flexible circuit board in proximity to the second via, wherein the first lead is soldered to the second surface of said circuit board and the second lead is soldered to the first surface of said flexible circuit board.

6. The rearview mirror assembly of claim 1, wherein said mirror is an electrochromic mirror having first and second electrodes in contact with an electrochromic medium.

7. The rearview mirror assembly of claim 1 and further comprising a mirror heater circuit disposed on said flexible circuit board.

8. The rearview mirror assembly of claim 1, wherein said LED includes a heat extraction member.

9. The rearview mirror assembly of claim 1, wherein said LED is mounted to said flexible circuit board with its optical axis normal to said flexible circuit board, and wherein said rearview mirror assembly further comprises an optical deviator disposed between said LED and said mirror so as to redirect light emitted from said LED along an axis that is not normal to said flexible circuit board.

10. The rearview mirror assembly of claim 9 and further including a diffuser disposed so as to diffuse light passing through said optical deviator.

11. The rearview mirror assembly of claim 10, wherein said diffuser is a diffused surface on said mirror.

12. The rearview mirror assembly of claim 10, wherein said diffuser is positioned between said mirror and said optical deviator.

13. The rearview mirror assembly of claim 1, wherein:

said mirror is an electrochromic mirror having front and rear surfaces and first and second electrical connectors disposed along edges of said electrochromic mirror,

said flexible circuit board is disposed behind the rear surface of said electrochromic mirror and has a first surface facing the rear surface of said electrochromic mirror and a second surface opposite the first surface,

said flexible circuit board includes printed electrical paths that extend to connectors that provide an electrical connection with said electrical connectors of said electrochromic mirror, and

said printed electrical paths extending to a common location on said flexible circuit board to provide mirror control terminals for connection to a source of a mirror control signal.

14. The rearview mirror assembly of claim 1, wherein said substantially transparent window is diffuse and diffuses the light emitted from said LED.

16. The method of claim 15, wherein said circuit board is a flexible circuit board.

18. The optical radiation emitting assembly of claim 17, wherein the solder is applied to the second lead so as to be disposed within the second via and extend to the second surface.

19. The optical radiation emitting assembly of claim 17, wherein said circuit board is a flexible circuit board.

20. The optical radiation emitting assembly of claim 17, wherein said optical radiation emitter device is an LED device.

15. A method of angle-mounting an LED to a circuit board comprising the steps of:

providing a circuit board having a first surface and second surface opposite the first surface, said circuit board further including at least first and second vias extending between the first and second surfaces;

providing an LED having at least a first lead and a second lead;

positioning said LED on said circuit board such that the optical axis of the LED is inclined relative to the first surface of said circuit board with the first lead of said LED inserted through said first via and the second lead abutting the first surface of said circuit board in proximity to the second via;

soldering the first lead to the second surface of said circuit board; and

soldering the second lead to the first surface of said circuit board such that solder is applied so as to be disposed within the second via and extend to the first surface.

17. An optical radiation emitting assembly comprising:

a circuit board having a first surface and second surface opposite the first surface, said circuit board further including at least first and second vias extending between the first and second surfaces; and

an optical radiation emitter device having at least a first lead and a second lead, said LED being positioned on said circuit board such that the optical axis of said optical radiation emitter device is inclined relative to the first surface of said circuit board with the first lead of said optical radiation emitter device inserted through said first via and the second lead abutting the first surface of said circuit board in proximity to the second via, wherein the first lead is soldered to the second surface of said circuit board and the second lead is soldered to the first surface of said circuit board.

21. A rearview mirror assembly for a vehicle comprising:

a mirror having a surface that is at least partially reflective;

a circuit board disposed behind said surface of said mirror and having a first surface and second surface opposite the first surface, said circuit board further including at least first and second vias extending between the first and second surfaces; and

an optical radiation emitter device having at least a first lead and a second lead, said LED being positioned on said circuit board such that the optical axis of said optical radiation emitter device is inclined relative to the first surface of said circuit board with the first lead of said optical radiation emitter device inserted through said first via and the second lead abutting the first surface of said circuit board in proximity to the second via, wherein the first lead is soldered to the second surface of said circuit board and the second lead is soldered to the first surface of said circuit board.

22. The rearview mirror assembly of claim 21, wherein said optical radiation emitter emits light through said mirror.

23. The rearview mirror assembly of claim 22, wherein said mirror is partially transmissive at least in a region in front of said optical radiation emitter.

24. The rearview mirror assembly of claim 21, wherein said mirror is an electrochromic mirror having first and second electrodes in contact with an electrochromic medium.

25. The rearview mirror assembly of claim 21, wherein the solder is applied to the second lead so as to be disposed within the second via and extend to the second surface.

26. The rearview mirror assembly of claim 21, wherein said circuit board is a flexible circuit board.

27. The rearview mirror assembly of claim 21, wherein said optical radiation emitter device is an LED device.

29. The optical radiation emitting assembly of claim 28, wherein said flexible circuit board includes at least one through hole proximate said LED chip and said encapsulant is molded so as to flow through said through hole to the second surface of said circuit board.

30. The optical radiation emitting assembly of claim 28, wherein said encapsulant defines an integral lens.

31. The optical radiation emitting assembly of claim 30, wherein said integral lens directs light from said LED chip at an angle relative to said flexible circuit board.

32. The optical radiation emitting assembly of claim 28 and further comprising a backing board secured to said second surface of said flexible circuit board.

28. An optical radiation emitting assembly comprising:

a flexible circuit board having a first surface and second surface opposite the first surface;

an LED chip mounted to the first surface of said flexible circuit board and electrically coupled to conductive tracings provided on said flexible circuit board; and

an encapsulant molded over and around said LED chip.

33. A rearview mirror assembly for a vehicle comprising:

a mirror having a surface that is at least partially reflective;

a flexible circuit board disposed behind said surface of said mirror and having a first surface and second surface opposite the first surface;

an LED chip mounted to the first surface of said flexible circuit board and electrically coupled to conductive tracings provided on said flexible circuit board; and

an encapsulant molded over and around said LED chip.

34. The rearview mirror assembly of claim 33, wherein said mirror is an electrochromic mirror having first and second electrodes in contact with an electrochromic medium.

35. The rearview mirror assembly of claim 33, wherein a portion of said flexible circuit board on which said LED chip is mounted is bent at an angle relative to said surface of said mirror.

36. The rearview mirror assembly of claim 33, wherein said flexible circuit board includes at least one through hole proximate said LED chip and said encapsulant is molded so as to flow through said through hole to the second surface of said flexible circuit board.

37. The rearview mirror assembly of claim 33, wherein said encapsulant defines an integral lens.

38. The rearview mirror assembly of claim 37, wherein said integral lens directs light from said LED chip at an angle relative to said flexible circuit board.

39. The rearview mirror assembly of claim 33 and further comprising a backing board secured to said second surface of said flexible circuit board.

40. A rearview mirror assembly for a vehicle comprising:

an electrochromic mirror having front and rear surfaces and first and second electrical connectors disposed along edges of said electrochromic mirror; and

a flexible circuit board disposed behind the rear surface of said electrochromic mirror and having a first surface facing the rear surface of said electrochromic mirror and a second surface opposite the first surface,

wherein said flexible circuit board includes printed electrical circuits that are terminated with connectors that provide an electrical connection with said electrical connectors of said electrochromic mirror, said printed electrical circuits extending to a common location on said flexible circuit board to provide mirror control terminals for connection to a source of a mirror control signal.

41. The rearview mirror assembly of claim 40, wherein said mirror control terminals include a pair of male contacts configured for engagement with corresponding female contacts in a connector plug that is connected to the source of the mirror control signal.

42. The rearview mirror assembly of claim 41, wherein said pair of male contacts includes a pair of lugs that are riveted to said flexible circuit board and extend outward from said second surface of said flexible circuit board.

43. The rearview mirror assembly of claim 40, wherein said flexible circuit board includes a resistive conductor extending back and forth across the first surface of said flexible circuit board to function as a mirror heater, said resistive conductor begins and ends at the common location to provide heater power terminals proximate the mirror control terminals.

44. The rearview mirror assembly of claim 43, wherein said mirror control terminals and said heater power terminals include male contacts configured for engagement with corresponding female contacts in a connector plug that is connected to the source of the mirror control signal and to a source of power for said mirror heater.

45. The rearview mirror assembly of claim 44, wherein said male contacts include lugs that are riveted to said flexible circuit board and extend outward from said second surface of said flexible circuit board.

46. The rearview mirror assembly of claim 43 and further including a turn indicator having at least one light source, wherein said flexible circuit board includes conductive paths extending therethrough from a location proximate said light source to the common location to provide turn indicator control terminals proximate said heater power terminals and said mirror control terminals, for connection to a source of a turn indicator control signal.

47. The rearview mirror assembly of claim 46, wherein said mirror control terminals, said heater power terminals, and said turn indicator control terminals include male contacts configured for engagement with corresponding female contacts in a connector plug that is connected to the source of the mirror control signal, the source of the turn indicator control signal, and to a source of power for said mirror heater.

48. The rearview mirror assembly of claim 47, wherein said male contacts include lugs that are riveted to said flexible circuit board and extend outward from said second surface of said flexible circuit board.

49. The rearview mirror assembly of claim 40 and further including a turn indicator having at least one light source, wherein said flexible circuit board includes conductive paths extending therethrough from a location proximate said light source to the common location to provide turn indicator control terminals proximate said mirror control terminals for connection to a source of a turn indicator control signal.

50. The rearview mirror assembly of claim 49, wherein said mirror control terminals and said turn indicator control terminals include male contacts configured for engagement with corresponding female contacts in a connector plug that is connected to the source of the mirror control signal and to the source of the turn indicator control signal.

51. The rearview mirror assembly of claim 50, wherein said male contacts include lugs that are riveted to said flexible circuit board and extend outward from said second surface of said flexible circuit board.

52. A rearview mirror assembly for a vehicle comprising:

a mirror having front and rear surfaces;

a flexible circuit board disposed behind the rear surface of said mirror and having a first surface facing the rear surface of said mirror and a second surface opposite the first surface; and

a turn indicator having at least one light source,

wherein said flexible circuit board includes a resistive conductor extending back and forth across the first surface of said flexible circuit board to function as a mirror heater, said resistive conductor begins and ends at a common location on said flexible circuit board to provide heater power terminals for connection to a source of heater power, and

wherein said flexible circuit board includes conductive paths extending therethrough from a location proximate said light source to the common location to provide turn indicator control terminals proximate said heater power terminals for connection to a source of a turn indicator control signal.

53. The rearview mirror assembly of claim 52, wherein said heater power terminals include male contacts configured for engagement with corresponding female contacts in a connector plug that is connected to the source of heater power.

54. The rearview mirror assembly of claim 53, wherein said male contacts include lugs that are riveted to said flexible circuit board and extend outward from said second surface of said flexible circuit board.

55. The rearview mirror assembly of claim 52, wherein said heater power terminals and said turn indicator control terminals include male contacts configured for engagement with corresponding female contacts in a connector plug that is connected to the source of heater power and to the source of the turn indicator control signal.

56. The rearview mirror assembly of claim 55, wherein said male contacts include lugs that are riveted to said flexible circuit board and extend outward from said second surface of said flexible circuit board.

58. The rearview mirror assembly of claim 57 and further comprising a carrier plate having an angled recess for holding said portion of said flexible circuit board at an angle relative to said mirror.

59. The rearview mirror assembly of claim 57, wherein said mirror is an electrochromic mirror.

60. The rearview mirror assembly of claim 57, wherein said at least one light emitting device includes a plurality of surface-mount LEDs.

57. A rearview mirror assembly for a vehicle, comprising:

a mirror having front and rear surfaces;

a flexible circuit board disposed behind the rear surface of said mirror and having a front surface facing the rear surface of said mirror and a rear surface opposite the front surface, wherein at least a portion of said flexible circuit is disposed at an angle to said mirror; and

at least one light emitting device surface-mounted to the angled portion of said flexible circuit board so as to selectively project light through said mirror at an angle thereto.

61. A rearview mirror assembly for a vehicle, comprising:

a mirror having front and rear surfaces;

a first circuit board disposed behind the rear surface of said mirror and having a front surface facing the rear surface of said mirror and a rear surface opposite the front surface; and

a light module having at least one light source mounted to a second circuit board,

wherein said first circuit board includes a first plug connector extending from the rear surface thereof, and said second circuit board having a second plug connector extending from a front surface thereof for mating engagement with the first plug connector, said first circuit board includes conductive paths extending from said first plug connector to another location to which wiring from the vehicle is coupled to provide lamp module activation signals.

62. The rearview mirror of claim 61, wherein said first circuit board includes a third plug connector for mating connection with a corresponding plug connector attached to the vehicle wiring, said third plug connector being coupled by said conductive paths to said first plug connector.

63. The rearview mirror assembly of claim 62, wherein said first circuit board includes a mirror heater disposed on the front surface thereof, said mirror heater being electrically coupled to said third plug connector for receipt from the vehicle wiring of a heater power signal.

64. The rearview mirror assembly of claim 63, wherein said mirror is an electrochromic mirror having front and rear surfaces and first and second electrical connectors disposed along edges of said electrochromic mirror, wherein said first circuit board includes printed electrical circuits that are terminated with connectors that provide an electrical connection with said electrical connectors of said electrochromic mirror, said printed electrical circuits extending to said third plug connector for connection to a source of a mirror control signal.

65. The rearview mirror assembly of claim 62, wherein said mirror is an electrochromic mirror having front and rear surfaces and first and second electrical connectors disposed along edges of said electrochromic mirror, wherein said first circuit board includes printed electrical circuits that are terminated with connectors that provide an electrical connection with said electrical connectors of said electrochromic mirror, said printed electrical circuits extending to said third plug connector for connection to a source of a mirror control signal.

66. The rearview mirror assembly of claim 61, wherein said first circuit board is a flexible circuit board.