LED lamp comprising a power regulating device

• US 9,399,425 B2
• Filed: 09/06/2013
• Issued: 07/26/2016
• Est. Priority Date: 03/07/2011
• Status: Active Grant

• Current Assignee: Zedel
• Original Assignee: Zedel
• Inventors: Bouffay, Boris, Maurice, Alain
• Primary Examiner(s): A, Minh D
• Application Number:
  US14/020,114
• Publication Number:
  US 20140001955A1
• Time in Patent Office: 1,054 Days
• Field of Search: 250/200, 250/201.1, 250/204, 250/205, 250/552, 315 76- 77, 315/80, 315/82
• US Class Current: 1/1
• CPC Class Codes: B60Q 1/1423 Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
• CPC Class Codes: F21L 4/00 Electric lighting devices with self-contained electric batteries or cells
• CPC Class Codes: F21L 4/005 the device being a pocket lamp F21L4/022, F21L4/045, F21L4/085 take precedence
• CPC Class Codes: F21V 14/00 Controlling the distribution of the light emitted by adjustment of elements reflectors with provision for adjusting the curvature F21V7/16; light filters or the like with provision for controlling the colour or intensity F21V9/40; screens using adjustable parallel laminae or strips F21V11/04; screens using iris-type diaphragms F21V11/10; screens using movable sheets without apertures F21V11/18; adjustable mountings for lighting devices F21V21/14
• CPC Class Codes: F21V 23/00 Arrangement of electric circuit elements in or on lighting devices characterised by cooling arrangements F21V29/508
• CPC Class Codes: F21V 23/0478 by means of an image recording device, e.g. a camera
• CPC Class Codes: F21V 25/00 Safety devices structurally associated with lighting devices gas- tight or water-tight arrangements F21V31/00; in general F16P; protective circuit arrangements per se H02H7/00
• CPC Class Codes: F21V 9/40 with provision for controlling spectral properties, e.g. colour, or intensity
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 47/10 Controlling the light source
• CPC Class Codes: H05B 47/125 by using cameras
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y02B 20/40 Control techniques providing energy savings, e.g. smart controller or presence detection

Abstract

A lamp, as for example a headlamp, comprising:

• • a light source having one or more LED-type diodes;
  • a power unit for generating electric power of said light source, said unit being controlled by a control information or a control signal;
  • a control unit for adjusting the light generated by said light source;
    wherein the control unit comprises an image sensor generating at least one image of the illuminated area from said light source and means for processing said image in order to generate said control information or said control signal

The lamp also includes a processor for image processing capable of performing complex analysis of the image, including the recognition of a rope, fog detection etc. . . .

Claims

1. A headlamp to be carried on a user'"'"'s head and allowing hand-free lighting for such user, said headlamp comprising:

a light source having one or more LED-type diodes;

a power unit for supplying electric power to said light source, said power unit being controlled by a control information or a control signal;

a control unit for controlling the light generated by said light source;

wherein said control unit comprises an image sensor included in said headlamp and aligned with the axis of said LEDs, said image sensor generating at least one image of the area illuminated by said light source and means for processing said image in order to generate said control information or said control signal,

wherein said processing means determines a specific control area (SCA) within said image, and being subject to image processing by an image processor; and

said image processor calculating the average brightness of the pixels of said image or a specific control area of said image;

wherein said image processor compares the result of said calculation with a predetermined threshold; and

said image processor generates a control information or a control signal for increasing the light intensity of the LED when said result is less than the predetermined threshold;

said image processor generates a control information or a control signal for reducing the light intensity of the LED when said result exceeds the predetermined threshold.

2. The headlamp according to claim 1 wherein said image processor performs a contrast analysis on said image in order to detect fog, mist and/or smoke particles.

3. The headlamp according to claim 2 wherein said image processor allows the detection of periodic passage of hands, whose pixels are excluded from said specific exposure area determined by said image processor.

4. The headlamp according to claim 2 wherein said image processor allows the detection of car headlights, whose pixels are excluded from the pixels of said specific exposure area determined by said image processor.

5. The headlamp according to claim 1 wherein said image processor performs the detection of a stripe of pixels, approximately vertical, showing a brightness higher than a threshold, the pixel corresponding to said pixel stripe being excluded from said specific exposure area determined by said image processor.

6. The headlamp according to claim 5 further comprising a second sensor generating one second information representative of the reflected light intensity of the illuminated area, wherein the control of said light source being derived from both digital processing of the pixels and from said second reflection information.

7. The headlamp according to claim 1 further comprising:

at least one infrared lamp having an axis offset from the axis of said light source;

a unit to control said infrared lamp to generate an infrared beam;

a unit for detecting a reflected infrared light, said control unit deriving from said detection an information representative of the presence of fog, mist and/or smoke particles to be forwarded to said control unit.

8. The headlamp according to claim 1 comprising means for detecting snowflakes within the specific control area for the generation of said control information and said control signal.

9. The headlamp according to claim 1 comprising means for configuration of the headlamp, in particular according to one or more predetermined profiles.

10. The headlamp according to claim 9 wherein said configuration is carried out by means of a USB port for communicating with a computer, a touch pad, or a smart phone.

11. The headlamp according to claim 10 further comprising:

a first profile for “

climbing/caving”

implementing one or more algorithms for recognition of a rope;

a second profile to implement one or more algorithms for detecting objects such as automobile headlights.

12. A method for adjusting the light generated by a headlamp to be carried by a user and allowing hand-free lighting for such user, said headlamp comprising one or more LEDs, a controllable power unit for supplying power to the LED lamps and a control unit for controlling the light generated by the headlamp, said method comprising the steps of:

generating an image of the illuminated area of the headlamp by means of an image sensor included in said headlamp and aligned with the axis of said LEDs;

storing said image in a storage memory;

processing of said image to generate a control information or a control signal to said power unit

further comprising the steps of;

calculating the average brightness of the pixels of said image or a specific control area of said image;

comparing the result of said calculation with a predetermined threshold,

generating a control information or a control signal for increasing the light intensity of the LED when said result is less than the predetermined threshold;

generating a control information or a control signal for reducing the light intensity of the LED when said result exceeds the predetermined threshold.