LED lamp

Patent metadata

Field	Value
Publication number	US-9080758-B2
Application number	US-201213448989-A
Country	US
Kind code	B2
Filing date	Apr 17, 2012
Priority date	Apr 22, 2011
Publication date	Jul 14, 2015
Grant date	Jul 14, 2015

Abstract

An LED lamp ( 1 ) is employed in a state mounted on a lighting fixture. The LED lamp ( 1 ) includes an LED source portion ( 2 ) including a plurality of LED chips, an illuminance sensor module ( 12 ) detecting ambient illuminance, and a controller controlling the LED source portion ( 2 ) in response to illuminance of ambient light other than light emitted by the LED source portion ( 2 ) on the basis of an output signal received from the illuminance sensor module ( 12 ) when the LED source portion ( 2 ) is in a lighting-up state. When the LED source portion ( 2 ) is in the lighting-up state, there is a possibility that the illuminance sensor module ( 12 ) detects not only the ambient light illuminance but also spontaneous light illuminance. The controller eliminates influence by the spontaneous light illuminance, and controls the LED source portion ( 2 ) in response to the illuminance of the ambient light.

First claim

What is claimed is:

1. An LED lamp mounted on a lighting fixture, comprising:
an LED source portion including a plurality of LED chips;
an illuminance sensor detecting ambient illuminance; and
a controller controlling the LED source portion in response to the illuminance of ambient light other than light emitted by the LED source portion on the basis of an output signal received from the illuminance sensor when the LED source portion is in a lighting-up state, wherein
the controller includes:
a spontaneous light illuminance calculating means calculating spontaneous light illuminance contributed to the output signal of the illuminance sensor by the light emitted by the LED source portion on the basis of a driven state of the LED source portion; and
an on-off control means turning on the LED source portion when ambient light illuminance obtained by subtracting the spontaneous light illuminance from the output signal of the illuminance sensor is less than or equal to a prescribed threshold and turning off the LED source portion when the ambient light illuminance is in excess of the threshold.

2. The LED lamp according to claim 1 , wherein the illuminance sensor is arranged to detect the light emitted by the LED source portion and the ambient light.

3. The LED lamp according to claim 1 , wherein
the controller further includes an illuminance-adaptive driving means driving the LED source portion with power responsive to the ambient light illuminance when the ambient light illuminance is less than or equal to the threshold.

4. The LED lamp according to claim 1 , further including a noncontact temperature sensor detecting the temperature of an object present in a predetermined temperature-sensing area in a noncontact manner, wherein
the controller is formed to control the LED source portion in response to the temperature detected by the noncontact temperature sensor.

5. An LED lamp mounted on a lighting fixture, comprising:
an LED source portion including a plurality of LED chips;
an illuminance sensor detecting ambient illuminance; and
a controller controlling the LED source portion in response to the illuminance of ambient light other than light emitted by the LED source portion on the basis of an output signal received from the illuminance sensor when the LED source portion is in a lighting-up state, wherein
the controller includes:
a storage means storing the output signal received from the illuminance sensor;
a comparison means comparing the output signal of the illuminance sensor and the value stored in the storage means with each other; and
an on-off control means turning on/off the LED source portion in response to the result of the comparison of the comparison means.

6. The LED lamp according to claim 5 , wherein
the storage means is formed to store the output signal received from the illuminance sensor when the LED source portion is in a predetermined lighting-up state.

7. The LED lamp according to claim 5 , further including a writing instruction means operated by an operator for writing the output signal of the illuminance sensor in the storage means, wherein
the controller further includes a writing means writing the output signal of the illuminance sensor in the storage means in response to an operation of the writing instruction means.

8. The LED lamp according to claim 7 , wherein
the writing instruction means includes a lighting-up instruction means for turning on the LED source portion in a predetermined state, and
the controller further includes a writing control means inhibiting the writing means from writing the output signal when the output signal of the illuminance sensor has already been written in the storage means and allowing the writing means to write the output signal when the output signal of the illuminance sensor is not yet written in the storage means.

9. The LED lamp according to claim 8 , further including an inhibition canceling operation means operated by the operator for canceling inhibition of the writing operation by the writing means, wherein
the writing control means is formed to allow the writing means to write the output signal in the storage means once in response to the operation of the inhibition canceling operation means.

10. The LED lamp according to claim 5 , wherein
the comparison means includes a means determining whether or not the ambient light illuminance obtained by subtracting the value stored in the storage means from the output signal of the illuminance sensor is less than or equal to the prescribed threshold, and
the on-off control means is formed to turn on the LED source portion when the ambient light illuminance is less than or equal to the threshold and to turn off the LED source portion when the ambient light illuminance is in excess of the threshold.

11. The LED lamp according to claim 5 , further including a noncontact temperature sensor detecting the temperature of an object present in a predetermined temperature-sensing area in a noncontact manner, wherein
the controller is formed to control the LED source portion in response to the temperature detected by the noncontact temperature sensor.

12. An LED lamp mounted on a lighting fixture, comprising:
an LED source portion including a plurality of LED chips;
an illuminance sensor detecting ambient illuminance; and
a controller controlling the LED source portion in response to the illuminance of ambient light other than light emitted by the LED source portion on the basis of an output signal received from the illuminance sensor when the LED source portion is in a lighting-up state, wherein
the controller includes a PWM control means PWM-controlling the LED source portion, and a sampling means sampling the output signal of the illuminance sensor as ambient light illuminance in an OFF-period when power supply to the LED source portion is stopped in a PWM cycle when the PWM control means PWM-controls the LED source portion, and is formed to control the LED source portion in response to the ambient light illuminance sampled by the sampling means.

13. The LED lamp according to claim 12 , wherein
the controller further includes a duty ratio setting means setting a duty ratio in the PWM control on the basis of the ambient light illuminance sampled by the sampling means.

14. The LED lamp according to claim 12 , further including a noncontact temperature sensor detecting the temperature of an object present in a predetermined temperature-sensing area in a noncontact manner, wherein
the controller is formed to control the LED source portion in response to the temperature detected by the noncontact temperature sensor.

15. An LED lamp mounted on a lighting fixture, comprising:
an LED source portion including a plurality of LED chips;
an illuminance sensor detecting ambient illuminance;
a controller controlling the LED source portion in response to the illuminance of ambient light other than light emitted by the LED source portion on the basis of an output signal received from the illuminance sensor when the LED source portion is in a lighting-up state; and
a motion sensor having a predetermined sensitivity region, wherein
the controller is formed to control the LED source portion in response to an output signal received from the motion sensor, wherein
the motion sensor includes a pyroelectric infrared sensor, and
the LED lamp further includes a shutter unit opening/closing an infrared incidence path to a photoreceiving surface of the pyroelectric infrared sensor.

16. The LED lamp according to claim 15 , wherein
the controller is formed to increase

Assignees

• Igaki Masaru
• Tanaka Masahide
• Rohm Co Ltd

Inventors

• Igaki Masaru
• Tanaka Masahide

Classifications

• F21K9/278

  Arrangement or mounting of circuit elements integrated in the light source · CPC title

• H05B47/11 Primary

  by determining the brightness or colour temperature of ambient light · CPC title

• F21Y2103/30

  curved · CPC title

• F21V23/0464 Primary

  the sensor sensing the level of ambient illumination, e.g. dawn or dusk sensors · CPC title

• F21V23/0471 Primary

  the sensor detecting the proximity, the presence or the movement of an object or a person · CPC title