Brightness controllable flashlights

• US 20040140771A1
• Filed: 01/16/2003
• Published: 07/22/2004
• Est. Priority Date: 01/16/2003
• Status: Active Grant

• Current Assignee: SureFire LLC (Surefire Holdings LLC)
• Original Assignee: SureFire LLC (Surefire Holdings LLC)
• Inventors: Kim, Paul Y., Hunt, William A.
• Granted Patent: US 6,841,941 B2
• Time in Patent Office: Days
• US Class Current: 315/86
• CPC Class Codes: F21L 4/025 the light sources being of different shape or type
• CPC Class Codes: F21V 23/02 the elements being transformers, impedances or power supply units, e.g. a transformer with a rectifier
• CPC Class Codes: F21V 23/0421 the switch being part of, or disposed on the tail cap portion thereof
• CPC Class Codes: F21Y 2101/00 Point-like light sources
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/38 using boost topology
• CPC Class Codes: H05B 47/00 Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

Flashlights having selectively controllable brightness levels, preferred embodiments of which comprise in combination: a battery; a switch having an OFF position not connected to the battery, a first ON position connected to the battery, and a second ON position connected to the battery; an electrical component (such as a resistor or an inductor) in circuit with the battery when the switch is in its first ON position and not in circuit with the battery when the switch is in its second ON position; a light emitter assembly; and a controller in circuit with the battery, the switch and the light emitter assembly, for detecting whether or not the electrical component is in circuit with the battery when the switch is in either one of its first ON position and its second ON position, and for controlling electrical power to the light emitter assembly for producing a first light output when the electrical component is detected and for producing a second light output when the electrical component is not detected.

Claims

1. In a flashlight, the combination comprising:

a battery;

a switch having an OFF position not connected to said battery, a first ON position connected to said battery, and a second ON position connected to said battery;

an electrical component in circuit with said battery when said switch is in said first ON position and not in circuit with said battery when said switch is in said second ON position;

a light emitter assembly; and

a controller in circuit with said battery, said switch and said light emitter assembly, for detecting whether or not said electrical component is in circuit with said battery when said switch is in either one of said first ON position and said second ON position, and for controlling electrical power to said light emitter assembly for producing a first light output when said electrical component is detected and for producing a second light output when said electrical component is not detected.

2. The flashlight according to claim 1, wherein:

said controller regulates power to said light emitter assembly for providing constant brightness of at least one of said first light output and said second light output.

3. The flashlight according to claim 2, wherein:

said controller abruptly reduces power to said light emitter assembly when said battery is near exhaustion, for abruptly reducing light output of said light emitter assembly.

4. The flashlight according to claim 1, including:

a switch actuator for placing said switch alternatively in said OFF position, said first ON position and said second ON position.

5. The flashlight according to claim 1, wherein:

a pushbutton coupled to said switch, said pushbutton depressible by a first distance placing said switch in said first ON position and depressible by a second distance placing said switch in said second ON position.

6. The flashlight according to claim 1, wherein:

said electrical component comprises a resistor.

7. The flashlight according to claim 6, wherein:

said resistor is in circuit with said battery when said switch is in said first ON position and is shorted out of said circuit when said switch is in said second ON position.

8. The flashlight according to claim 1, wherein:

said electrical component comprises an inductor.

9. The flashlight according to claim 8, wherein:

said inductor is in circuit with said battery when said switch is in said first ON position, and said inductor is shorted out of said circuit when said switch is in said second ON position.

10. The flashlight according to claim 1, wherein:

said light emitter assembly includes an incandescent lamp connected to said controller and at least one light emitting diode connected to said battery through said switch, said at least one light emitting diode being powered by said battery for producing light output when said switch is in said first ON position, said controller delivering power to said incandescent lamp for producing light output when said switch is in said second ON position but not when said switch is in said first ON position.

11. The flashlight according to claim 10, wherein:

said at least one light emitting diode is powered by said battery for producing light output when said switch is in said second ON position.

12. The flashlight according to claim 10, including:

a switch actuator coupled to said switch and translatable by a first distance placing said switch in said first ON position and translatable by a second distance placing said switch in said second ON position.

13. The flashlight according to claim 12, wherein:

said switch actuator includes a pushbutton depressible by said first distance placing said switch in said first ON position and depressible by said second distance placing said switch in said second position.

14. The flashlight according to claim 10, wherein:

said controller regulates power to said incandescent lamp for providing constant brightness of the light output of said incandescent lamp when said switch is in said second ON position.

15. The flashlight according to claim 14, wherein:

said controller abruptly reduces power to said incandescent lamp when said battery is near exhaustion, for abruptly reducing light output of said light emitter assembly.

16. The flashlight according to claim 10, wherein:

said electrical component comprises a resistor.

17. The flashlight according to claim 16, wherein:

said resistor is in circuit with said battery when said switch is in said first ON position, and said resistor is shorted out of said circuit when said switch is in said second ON position.

18. The flashlight according to claim 1, wherein:

said light emitter assembly includes an incandescent lamp connected to said controller, said controller delivering power to said incandescent lamp for producing said first light output when said switch is in said first ON position and for producing said second light output when said switch is in said second ON position.

19. The flashlight according to claim 18, including:

a switch actuator coupled to said switch and translatable by a first distance placing said switch in said first ON position and translatable by a second distance placing said switch in said second ON position.

20. The flashlight according to claim 19, wherein:

said switch actuator includes a pushbutton depressible by said first distance placing said switch in said first ON position and depressible by said second distance placing said switch in said second position.

21. The flashlight according to claim 18, wherein:

said controller regulates power to said incandescent lamp for providing constant brightness of said first light output and constant brightness of said second light output.

22. The flashlight according to claim 21, wherein:

said controller abruptly reduces power to said incandescent lamp when said battery is near exhaustion, for abruptly reducing light output of said incandescent lamp.

23. The flashlight according to claim 18, wherein:

said second light output is brighter than said first light output.

24. The flashlight according to claim 18, wherein:

said electrical component comprises an inductor.

25. The flashlight according to claim 24, wherein:

said inductor is in circuit with said battery when said switch is in said first ON position, and said resistor is shorted out of said circuit when said switch is in said second ON position.

26. The flashlight according to claim 1, wherein:

said light emitter assembly includes two incandescent lamps connected to said controller, said controller delivering power to one of said incandescent lamps for producing light output when said switch is in said first ON position, said controller delivering power to the other of said incandescent lamps for producing light output when said switch is in said second ON position.

27. The flashlight according to claim 26, including:

a switch actuator coupled to said switch and translatable by a first distance placing said switch in said first ON position and translatable by a second distance placing said switch in said second ON position.

28. The flashlight according to claim 27, wherein:

said switch actuator includes a pushbutton depressible by said first distance placing said switch in said first ON position and depressible by said second distance placing said switch in said second position.

29. The flashlight according to claim 26, wherein:

said controller regulates power to said incandescent lamps for providing constant brightness of the light output of said one of said incandescent lamps and for providing constant brightness of the light output of said other of said incandescent lamps.

30. The flashlight according to claim 29, wherein:

said controller abruptly reduces power to said incandescent lamps when said battery is near exhaustion, for abruptly reducing light output of said incandescent lamps.

31. The flashlight according to claim 26, wherein:

said electrical component comprises an inductor.

32. The flashlight according to claim 31, wherein:

said inductor is in circuit with said battery when said switch is in said first ON position, and said inductor is shorted out of said circuit when said switch is in said second ON position.

33. The flashlight according to claim 1, wherein:

said light emitter assembly includes two incandescent lamps connected to said controller, said controller delivering power to one of said incandescent lamps for producing said first light output when said switch is in said first ON position, said controller delivering power to both of said incandescent lamps for producing said second light output when said switch is in said second ON position.

34. The flashlight according to claim 33, including:

a switch actuator coupled to said switch and translatable by a first distance placing said switch in said first ON position and translatable by a second distance placing said switch in said second ON position.

35. The flashlight according to claim 34, wherein:

said switch actuator includes a pushbutton depressible by said first distance placing said switch in said first ON position and depressible by said second distance placing said switch in said second position.

36. The flashlight according to claim 33, wherein:

said controller regulates power to said incandescent lamps for providing constant brightness of said first light output and for providing constant brightness of said second light output.

37. The flashlight according to claim 36, wherein:

said controller abruptly reduces power to said incandescent lamps when said battery is near exhaustion, for abruptly reducing light output of said incandescent lamps.

38. The flashlight according to claim 33, wherein:

said electrical component comprises an inductor.

39. The flashlight according to claim 38, wherein:

said inductor is in circuit with said battery when said switch is in said first ON position, and said inductor is shorted out of said circuit when said switch is in said second ON position.

40. The flashlight according to claim 1, wherein:

said light emitter assembly includes a light emitting diode connected to said controller, said controller controlling power to said light emitting diode for producing said first light output when said switch is in said first ON position and for producing said second light output when said switch is in said second ON position.

41. The flashlight according to claim 40, wherein:

said second light output is brighter than said first light output.

42. The flashlight according to claim 40, including:

a switch actuator coupled to said switch and translatable by a first distance placing said switch in said first ON position and translatable by a second distance placing said switch in said second ON position.

43. The flashlight according to claim 42, wherein:

said switch actuator includes a pushbutton depressible by said first distance placing said switch in said first ON position and depressible by said second distance placing said switch in said second position.

44. The flashlight according to claim 40, wherein:

said controller regulates power to said light emitting diode for providing constant brightness of said first light output and for providing constant brightness of said second light output.

45. The flashlight according to claim 44, wherein:

said controller abruptly reduces power to said light emitting diode when said battery is near exhaustion, for abruptly reducing light output of said light emitting diode.

46. The flashlight according to claim 40, wherein:

said electrical component comprises a resistor.

47. The flashlight according to claim 46, wherein:

said battery is of approximately three volts.

48. The flashlight according to claim 47, wherein:

said resistor is in circuit with said battery when said switch is in said first ON position, and said resistor is shorted out of said circuit when said switch is in said second ON position.

49. The flashlight according to claim 40, wherein:

said electrical component comprises an inductor.

50. The flashlight according to claim 49 wherein:

said inductor is in circuit with said battery when said switch is in said first ON position, and said inductor is shorted out of said circuit when said switch is in said second ON position.

51. The flashlight according to claim 49, wherein:

said battery is of approximately six volts.

52. The flashlight according to claim 1, including:

a battery housing for said battery, said battery housing having a rear end and a front end, said light emitter assembly situated at said front end; and

a tail cap assembly coupled to said battery housing at said rear end, said tail cap assembly including said switch and said electrical component.

53. The flashlight according to claim 52, wherein:

said tail cap assembly includes a pushbutton depressible by a first distance placing said switch in said first ON position and depressible by a second distance placing said switch in said second ON position.

54. The flashlight according to claim 52, wherein:

said controller electrically communicates with said switch and said electrical component along said battery housing.

55. The flashlight according to claim 54, wherein:

said rear end of said battery housing includes an electrically conductive rear edge; and

said switch includes a contact member coupled through said electrical component to a terminal of said battery in said battery housing, said contact member including at least one resilient arm spaced from said conductive rear edge of said battery housing when said switch is in said OFF position, said at least one resilient arm in conductive contact with said conductive rear edge when said switch is in said first ON position, said at least one resilient arm in conductive contact with said conductive rear edge and with said terminal of said battery shorting out said electrical component when said switch is in said second ON position.

56. The flashlight according to claim 55, wherein:

said tail cap assembly includes a switch actuator for placing said at least one resilient arm of said contact member in conductive contact with said conductive rear edge of said battery housing, and for placing said at least one resilient arm in conductive contact with said conductive rear edge and with said terminal of said battery shorting out said electrical component.

57. The flashlight according to claim 56, wherein:

said switch actuator is provided by said tail cap assembly threadedly rotatable along said rear end of said battery housing for translating said tail cap assembly a first distance placing said at least one resilient arm of said contact member in conductive contact with said rear conductive edge of said battery housing, and for translating said tail cap assembly a second distance placing said at least one resilient arm in conductive contact with said rear edge and with said terminal of said battery shorting out said electrical component.

58. The flashlight according to claim 56, wherein:

said switch actuator is provided by a pushbutton included in said tail cap assembly, said pushbutton depressible by a first distance for urging said at least one resilient arm of said contact member in conductive contact with said conductive rear edge of said battery housing, said pushbutton depressible by a second distance for urging said at least one resilient arm in conductive contact with said conductive rear edge and with said terminal of said battery shorting out said electrical component.

59. The flashlight according to claim 56, wherein:

said controller regulates power to said light emitter assembly for providing constant brightness of at least one of said first light output and said second light output.

60. The flashlight according to claim 59, wherein:

said controller abruptly reduces power to said light emitter assembly when said battery is near exhaustion, for abruptly reducing light output of said light emitter assembly.

61. The flashlight according to claim 56, wherein:

said electrical component comprises a resistor.

62. The flashlight according to claim 56, wherein:

said electrical component comprises an inductor.

63. The flashlight according to claim 56, wherein:

said light emitter assembly includes an incandescent lamp connected to said controller and at least one light emitting diode connected to said battery through said switch, said at least one light emitting diode being powered by said battery for producing light output when said switch is in either one of said first ON position and said second ON position, said controller delivering power to said incandescent lamp for producing light output when said switch is in said second ON position but not when said switch is in said first ON position.

64. The flashlight according to claim 63, wherein:

said controller regulates power to said incandescent lamp when said switch is in said second ON position.

65. The flashlight according to claim 64, wherein:

said controller abruptly reduces power to said incandescent lamp when said battery is near exhaustion, for abruptly reducing light output of said light emitter assembly.

66. The flashlight according to claim 63, wherein:

said electrical component comprises a resistor.

67. The flashlight according to claim 56, wherein:

said light emitter assembly includes an incandescent lamp connected to said controller, said controller delivering power to said incandescent lamp for producing said first light output when said switch is in said first ON position and for producing said second light output when said switch is in said second ON position.

68. The flashlight according to claim 67, wherein:

said controller regulates power to said incandescent lamp for providing constant brightness of said first light output and constant brightness of said second light output.

69. The flashlight according to claim 68, wherein:

said controller abruptly reduces power to said incandescent lamp when said battery is near exhaustion, for abruptly reducing light output of said incandescent lamp.

70. The flashlight according to claim 67, wherein:

said second light output is brighter than said first light output.

71. The flashlight according to claim 67, wherein:

said electrical component comprises an inductor.

72. The flashlight according to claim 56, wherein:

said light emitter assembly includes two incandescent lamps connected to said controller, said controller delivering power to one of said incandescent lamps for producing light output when said switch is in said first ON position, said controller delivering power to the other of said incandescent lamps for producing light output when said switch is in said second ON position.

73. The flashlight according to claim 72, wherein:

said controller regulates power to said incandescent lamps for providing constant brightness of the light output of said one of said incandescent lamps and for providing constant brightness of the light output of said other of said incandescent lamps.

74. The flashlight according to claim 73, wherein:

said controller abruptly reduces power to said incandescent lamps when said battery is near exhaustion, for abruptly reducing light output of said incandescent lamps.

75. The flashlight according to claim 72, wherein:

said electrical component comprises an inductor.

76. The flashlight according to claim 56, wherein:

said light emitter assembly includes two incandescent lamps connected to said controller, said controller delivering power to one of said incandescent lamps for producing said first light output when said switch is in said first ON position, said controller delivering power to both of said incandescent lamps for producing said second light output when said switch is in said second ON position.

77. The flashlight according to claim 76, wherein:

said controller regulates power to said incandescent lamps for providing constant brightness of said first light output and for providing constant brightness of said second light output.

78. The flashlight according to claim 77, wherein:

said controller abruptly reduces power to said incandescent lamps when said battery is near exhaustion, for abruptly reducing light output of said incandescent lamps.

79. The flashlight according to claim 76, wherein:

said electrical component comprises an inductor.

80. The flashlight according to claim 56, wherein:

said light emitter assembly includes a light emitting diode connected to said controller, said controller controlling power to said light emitting diode for producing said first light output when said switch is in said first ON position and for producing said second light output when said switch is in said second ON position.

81. The flashlight according to claim 80, wherein:

said second light output is brighter than said first light output.

82. The flashlight according to claim 80, wherein:

said controller regulates power to said light emitting diode for providing constant brightness of said first light output and for providing constant brightness of said second light output.

83. The flashlight according to claim 82, wherein:

said controller abruptly reduces power to said light emitting diode when said battery is near exhaustion, for abruptly reducing light output of said light emitting diode.

84. The flashlight according to claim 80, wherein:

said electrical component comprises a resistor.

85. The flashlight according to claim 84, wherein:

said battery is of approximately three volts.

86. The flashlight according to claim 80, wherein:

said electrical component comprises an inductor.

87. The flashlight according to claim 86, wherein:

said battery is of approximately six volts.

88. In a flashlight, the combination comprising:

a battery;

a switch having an OFF position not connected to said battery, a first ON position connected to said battery, and a second ON position connected to said battery;

a light emitter assembly;

a controller in circuit with said battery, said switch and said light emitter assembly, said controller controlling electrical power to said light emitter assembly for producing a first light output when said switch is in said first ON position and for producing a second light output when said switch is in said second ON position; and

a switch actuator coupled to said switch and translatable by a first distance placing said switch in said first ON position and translatable by a second distance placing said switch in said second ON position.

89. The flashlight according to claim 88, wherein:

said switch actuator includes a pushbutton depressible by said first distance placing said switch in said first ON position and depressible by said second distance placing said switch in said second ON position.

90. The flashlight according to claim 88, wherein:

said controller detects when said switch is in said first ON position and in said second ON position.

91. The flashlight according to claim 90, wherein:

said switch actuator includes a pushbutton depressible by said first distance placing said switch in said first ON position and depressible by said second distance placing said switch in said second ON position.

92. A method of indicating near exhaustion of a battery in a flashlight including a light emitter, comprising:

regulating power from the battery to the light emitter for providing constant brightness of light output over time;

detecting near exhaustion of the battery; and

abruptly reducing power to the light emitter for providing an abrupt decrease in light output when near exhaustion of the battery is detected.

93. The method according to claim 92, wherein:

during the reducing step, the light output is abruptly reduced to approximately 20% of the light output provided during the regulating step.

94. The method according to claim 92, wherein:

during the regulating step, periodically correcting duty cycle for maintaining said constant brightness of light output over time; and

during the detecting step, detecting when the duty cycle is near 100%.

95. The method according to claim 92, including:

after the reducing step, regulating the reduced power to the light emitter for providing constant brightness of the decreased light output.

96. The method according to claim 95, wherein:

during the reducing step, the light output is abruptly reduced to approximately 20% of the light output provided during the regulating step.

97. The method according to claim 95, wherein:

during the regulating step before detecting near exhaustion of the battery, periodically correcting duty cycle for maintaining said constant brightness of light output over time; and

during the detecting step, detecting when the duty cycle is near 100%.