JP2009266461A - Light-emitting diode illumination device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting diode illumination device which has light-emitting diodes as a light source and is easy in light control according to external information. <P>SOLUTION: The illumination device includes a substrate 10, light-emitting diodes 21-2n arranged on the substrate 10, a drive circuit 30 which is arranged on the substrate 10 and drives the light-emitting diodes 21-2n, a detection circuit 40 which is arranged on the substrate 10 and senses external information, a control circuit 50 which is arranged on the substrate 10 and controls the drive circuit 30 according to the external information sensed by the detection circuit 40, and an illumination cover 60 which is arranged on the substrate 10 covering the light-emitting diodes 21-2n, the drive circuit 30, the detection circuit 40, and the control circuit 50, and through which emitting light of the light-emitting diodes 21-2n transmits. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a light emitting diode illumination device using a light emitting diode as a light source.

  In recent years, an illuminating device using a light emitting diode (LED) as a light source instead of a fluorescent lamp or the like has been put into practical use. By using the LED as the light source, effects such as long life and energy saving can be obtained as compared with the case of using a fluorescent tube.

In particular, if a lighting tube (hereinafter referred to as an “LED tube”) containing a LED and a drive circuit for driving the LED can be attached to an existing lighting device for a fluorescent lamp instead of the fluorescent tube, the lighting device for a fluorescent lamp Therefore, the existing equipment can be used as it is (see, for example, Patent Document 1).
JP 2004-192833 A

  However, for example, when an LED tube is attached to an existing fluorescent lamp luminaire, a control circuit for driving the LED is included in the LED tube, and thus the ambient brightness attached to the conventional fluorescent lamp luminaire. There is a problem that it is difficult to use a light control device that adjusts the luminance of a fluorescent lamp according to information from the outside.

  In view of the above problems, an object of the present invention is to provide a light-emitting diode illuminating device that uses a light-emitting diode as a light source and can be easily dimmed according to external information.

  According to one aspect of the present invention, a substrate, a light emitting diode disposed on the substrate, a driving circuit disposed on the substrate and driving the light emitting diode, and a sensing circuit disposed on the substrate and sensing external information. And a control circuit which is disposed on the substrate and controls the driving circuit according to external information sensed by the sensing circuit, and is disposed on the substrate so as to cover the light emitting diode, the driving circuit, the sensing circuit, and the control circuit. There is provided a light-emitting diode illuminating device including an illumination cover through which the emitted light is transmitted.

  ADVANTAGE OF THE INVENTION According to this invention, the light emitting diode illuminating device which uses a light emitting diode as a light source and can perform light control easily according to external information can be provided.

  Next, first and second embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the lengths of the respective parts, and the like are different from the actual ones. Therefore, specific dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

  Further, the first and second embodiments shown below exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the shape of component parts. The structure, arrangement, etc. are not specified below. The technical idea of the present invention can be variously modified within the scope of the claims.

(First embodiment)
As shown in FIG. 1, the light-emitting diode illuminating device 1 according to the first embodiment of the present invention is disposed on a substrate 10, a plurality of light-emitting diodes 21 to 2 n disposed on the substrate 10, and the substrate 10. , A driving circuit 30 for driving the light emitting diodes 21 to 2n, a sensing circuit 40 arranged on the substrate 10 for sensing external information, and arranged on the substrate 10 and driven according to the external information sensed by the sensing circuit 40 A control circuit 50 that controls the circuit 30, and the light emitting diodes 21 to 2n, the driving circuit 30, the sensing circuit 40, and the control circuit 50 are arranged on the substrate 10 so as to transmit light emitted from the light emitting diodes 21 to 2n. And a cover 60 (n: an integer of 2 or more). FIG. 1A is a top view of the light-emitting diode illuminating device 1 as viewed from above the surface 11 of the substrate 10 such as a printed circuit board on which the light-emitting diodes (LEDs) 21 to 2n are arranged, and the illumination cover 60 is not illustrated. is doing. FIG. 1B is a side view of the light-emitting diode illuminating device 1. Although FIG. 1 shows an example in which the LEDs 21 to 2n connected in series are arranged on the substrate 10, the number of light emitting diodes arranged on the substrate 10 may be one.

  Here, the sensing circuit 40 shown in FIG. 1 functions as an illuminance sensor that senses the brightness around the light-emitting diode illumination device 1 as external information. The sensing circuit 40 transmits a sensing signal SA corresponding to the sensed brightness to the control circuit 50. For example, a photodiode or the like can be used for the sensing circuit 40. When a photodiode is employed in the sensing circuit 40, the current value output from the photodiode upon receiving ambient brightness is used as the sensing signal SA. That is, the brightness around the light-emitting diode illuminating device 1 is converted into an electrical signal by the sensing circuit 40, and this electrical signal is transmitted to the control circuit 50 as the sensing signal SA. Here, it is assumed that the sensing signal SA value is set to be larger as the ambient brightness sensed by the sensing circuit 40 is brighter.

  The control circuit 50 controls the drive circuit 30 according to the sensing signal SA so that the emitted light from the LEDs 21 to 2n has a desired luminance. For example, the drive circuit 30 is controlled so that the brightness of the LEDs 21 to 2n is lowered as the periphery of the light-emitting diode illumination device 1 is brighter. Alternatively, when the sensing signal SA value corresponding to the ambient brightness sensed by the sensing circuit 40 is larger than the preset turn-off setting value, that is, when the surroundings of the light-emitting diode illuminating device 1 are brighter than the predetermined brightness, the LEDs 21 to 21 The drive circuit 30 may be controlled so that 2n is in a non-light emitting state. Further, when the sensing signal SA value is smaller than a preset lighting setting value, that is, when the surroundings of the light-emitting diode illuminating device 1 are darker than a predetermined brightness, the non-light-emitting LEDs 21 to 2n are turned on. The drive circuit 30 may be controlled.

  The control circuit 50 outputs the control signal SB to the drive circuit 30 and controls the drive circuit 30. For example, the drive circuit 30 is subjected to pulse width modulation (PWM) control by the control signal SB of the pulse signal in which the duty amount is set according to the desired luminance of the light emitted from the LEDs 21 to 2n. Alternatively, the drive circuit 30 may be controlled by a DC voltage value or the like.

  The drive circuit 30 controls the luminance of the emitted light of the LEDs 21 to 2n by increasing or decreasing the drive current of the LEDs 21 to 2n according to the control signal SB, or switches between the light emitting state and the non-light emitting state of the LEDs 21 to 2n. . For example, when the surroundings are bright, the drive current of the LEDs 21 to 2n is decreased to lower the luminance of the emitted light of the LEDs 21 to 2n. Alternatively, the LEDs 21 to 2n are changed from the light emitting state to the non-light emitting state. On the other hand, when the surroundings are dark, the drive current of the LEDs 21 to 2n is increased to increase the luminance of the emitted light of the LEDs 21 to 2n. Alternatively, the LEDs 21 to 2n are changed from the non-light emitting state to the light emitting state.

  An aluminum (Al) plate or the like can be used for the substrate 10. Further, a heat sink made of Al or the like may be disposed on the back surface 12 of the substrate 10 in order to release the heat generated from the LEDs 21 to 2n and the like.

  The illumination cover 60 can be formed using a material that allows the emitted light of the LEDs 21 to 2n to pass therethrough. For example, the illumination cover 60 is formed of silicon resin, acrylic resin, polycarbonate resin, or the like. The illumination cover 60 protects the LEDs 21 to 2n, the drive circuit 30, the sensing circuit 40, the control circuit 50, and the like disposed on the substrate 10, and diffuses the emitted light of the LEDs 21 to 2n to the outside of the light emitting diode illumination device 1. Output to. For this reason, light with high directivity emitted from each of the LEDs 21 to 2n can be uniformly irradiated over a wide area from the light emitting diode illumination device 1. Moreover, the light output from the light-emitting diode illuminating device 1 can be adjusted to a desired color by applying a phosphor to the illumination cover 60. Various shapes can be adopted as the outer shape of the illumination cover 60. For example, the illumination cover 60 may be rectangular or cylindrical.

  In the example shown in FIG. 1, the drive circuit 30, the sensing circuit 40, and the control circuit 50 are disposed on the surface 11 of the substrate 10 on which the LEDs 21 to 2n are disposed. However, any or all of the drive circuit 30, the sensing circuit 40, and the control circuit 50 may be disposed on the back surface 12 of the substrate 10. By reducing the circuits other than the LEDs 21 to 2n arranged on the surface 11 of the substrate 10, the non-light emitting area on the surface 11 can be reduced.

  The case where the sensing circuit 40 senses the brightness around the light-emitting diode illuminating device 1 as external information has been described above. The sensing circuit 40 may sense an ambient environment other than brightness, such as temperature and the presence of a person, and control the luminance and light emission state of the emitted light of the LEDs 21 to 2n according to the sensed information.

  As described above, according to the light-emitting diode illuminating device 1 according to the first embodiment of the present invention, the adjustment of the luminance of the LEDs 21 to 2n and the non-emission state of the LEDs 21-2n according to the external information sensed by the sensing circuit 40. The light emission state is switched. That is, it is possible to provide a light-emitting diode illuminating device that uses an LED as a light source and can easily adjust light in accordance with external information.

  For example, a standard compatible with a conventional fluorescent tube fitting is used in the light-emitting diode illuminating device 1 including the substrate 10 on which the LEDs 21 to 2n, the driving circuit 30, the sensing circuit 40, and the control circuit 50 are arranged and the illumination cover 60. The LED tube is added to make an LED tube. At this time, the external dimensions of the LED tube are the same as those of the conventional fluorescent tube. Then, by attaching this LED tube to an existing fluorescent tube luminaire instead of the fluorescent tube, a light-emitting diode that can be easily dimmed without requiring modification of the fluorescent tube luminaire or special electrical work, etc. A lighting device using can be installed.

  Here, the “lighting device for fluorescent tube” is a device that supports the fluorescent tube and functions as a power source for supplying power to the fluorescent tube. That is, the LED tube mounted on the fluorescent tube lighting fixture is supported by the fluorescent tube lighting fixture and supplied with power from the fluorescent tube lighting fixture. Usually, since the LED is driven by a DC power supply, it is preferable to arrange an AC / DC converter in the LED tube when the fluorescent tube lighting fixture supplies AC power.

  FIG. 2 shows an example of an LED tube in which a fitting 100 for attaching to a fluorescent tube lighting fixture is added to both ends in the longitudinal direction of the light-emitting diode illuminating device 1 shown in FIG. The external dimensions of the cap 100 are compatible with the standard of the fluorescent tube cap, for example, the G13 type. The LED tube is supported on the fluorescent tube lighting fixture by the electrode terminals 101 and 102 included in the fitting 100 and is connected to a power source. The electrode terminals 101 and 102 are disposed through the fitting 100, and each circuit of the light-emitting diode illuminating device 1, that is, the LEDs 21 to 2n, the drive circuit 30, the sensing circuit 40, and the control circuit 50, and the electrode terminals 101 and 102, Are electrically connected to the LEDs 21 to 2n, the drive circuit 30, the sensing circuit 40, and the control circuit 50 through the electrode terminals 101 and 102, from the fluorescent tube lighting apparatus.

  When the LED tube shown in FIG. 2 is mounted on an existing fluorescent lamp luminaire, the LED tube includes a sensing circuit 40, a control circuit 50, etc. The luminance of the light emitting diode illumination device 1 can be controlled without using an optical device.

(Second Embodiment)
As shown in FIG. 3, the light-emitting diode illuminating device 1A according to the second embodiment of the present invention is such that the sensing circuit 40A senses the remote signal SC output from the remote controller 200 as shown in FIG. This is a difference from the lighting device 1. Other configurations are the same as those of the first embodiment shown in FIG.

  The light-emitting diode illuminating device 1 shown in FIG. 1 senses ambient environment information such as brightness as external information, and controls the light emission states of the LEDs 21 to 2n according to the sensed external information. On the other hand, the light-emitting diode illuminating device 1A shown in FIG. 3 senses the remote signal SC from the remote controller 200 as external information, and controls the light emission states of the LEDs 21 to 2n according to the remote signal SC. That is, the sensing circuit 40A functions as a light receiving sensor for the remote signal SC. For this reason, the operator of the remote controller 200 can adjust the brightness of the light-emitting diode illuminating device 1A and turn the operation on / off.

  Specifically, adjustment knobs and buttons for adjusting the brightness of the light-emitting diode illuminating device 1A and setting the on / off operation are arranged on the remote controller 200. Then, a remote signal SC corresponding to the operation of these adjustment knobs and buttons is output from the remote controller 200 to the light emitting diode illumination device 1A. That is, a desired luminance value, luminance increase / decrease, on / off operation, and other settings are output to the light-emitting diode illuminating device 1A by the remote signal SC. For communication between the remote controller 200 and the sensing circuit 40A, for example, infrared communication can be employed.

  The remote signal SC is sensed by the sensing circuit 40A. For example, a phototransistor or the like can be adopted as the remote signal SC receiving portion of the sensing circuit 40A. The sensing circuit 40A converts the sensed remote signal SC into an electrical signal, and this electrical signal is transmitted to the control circuit 50 as the sensing signal SA. As already described, the control circuit 50 controls the drive circuit 30 according to the sensing signal SA. As a result, the drive circuit 30 sets the light emission state of the LEDs 21 to 2n according to the desired setting transmitted by the remote signal SC.

  For example, an LED tube as shown in FIG. 2 is configured using the light-emitting diode illuminating device 1A, and the LED tube can be attached to each of a plurality of fluorescent lamp illuminators arranged on the ceiling or the like. In this case, since each LED tube is provided with the sensing circuit 40A, it is possible to adjust the luminance of only the LED tube at a desired position or to perform an on / off operation.

  Moreover, the example which made the shape of the illumination cover 60 the same spherical shape as the incandescent lamp used conventionally is shown to Fig.4 (a). In the example shown in FIG. 4A, the LEDs 21 to 24 and the sensing circuit 40 </ b> A are arranged on the surface 11 of the substrate 10. For example, as shown in FIG. 4B, the LEDs 21 to 24 are arranged in a matrix on the surface 11, and the sensing circuit 40 </ b> A is arranged in the remaining area other than the LEDs 21 to 24 on the surface 11. A drive circuit 30 and a control circuit 50 are disposed on the back surface 12 of the substrate 10. Of course, the number of LEDs arranged on the surface 11 is not limited to four.

  As shown in FIG. 4A, for example, a metal fitting 110 having an external dimension compatible with a metal fitting such as an E26 type is added to the back surface 12 of the substrate 10, whereby the light emitting diode illumination device 1A is used for a conventional light bulb. It can be attached to lighting equipment or the like.

  As described above, according to the light-emitting diode illuminating device 1A according to the second embodiment of the present invention, the brightness can be adjusted and the on / off operation can be controlled by the remote controller 200, and dimming is easy. A light emitting diode illumination device can be provided. Others are substantially the same as those in the first embodiment, and redundant description is omitted.

(Other embodiments)
As described above, the present invention has been described according to the first and second embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the description of the embodiment already described, the LEDs 21 to 2n connected in series are arranged on the substrate 10. However, a light-emitting diode illuminating device in which a plurality of LEDs connected in series or in parallel is arranged in a matrix is realized. can do.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the structure of the light-emitting-diode illuminating device which concerns on the 1st Embodiment of this invention, Fig.1 (a) is a top view seen from the upper surface of a board | substrate surface, FIG.1 (b) is a side view. . It is a schematic diagram which shows the structure of the LED tube using the light emitting diode illuminating device which concerns on the 1st Embodiment of this invention. It is a schematic diagram which shows the structure of the light emitting diode illuminating device which concerns on the 2nd Embodiment of this invention. It is a schematic diagram which shows the other structure of the light-emitting-diode illuminating device which concerns on the 2nd Embodiment of this invention, Fig.4 (a) is a side view, FIG.4 (b) is the top view seen from the upper direction of the board | substrate surface. It is.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A ... Light-emitting-diode illuminating device 10 ... Board | substrate 21-2n ... Light-emitting-diode 30 ... Drive circuit 40, 40A ... Sensing circuit 50 ... Control circuit 60 ... Illumination cover 100, 110 ... Mouth fitting 200 ... Remote controller

Claims (5)

A substrate,
A light emitting diode disposed on the substrate;
A driving circuit disposed on the substrate and driving the light emitting diode;
A sensing circuit disposed on the substrate for sensing external information;
A control circuit disposed on the substrate and controlling the driving circuit according to the external information sensed by the sensing circuit;
A light-emitting diode illuminating device comprising: an illumination cover that is disposed on the substrate so as to cover the light-emitting diode, the driving circuit, the sensing circuit, and the control circuit, and allows light emitted from the light-emitting diode to pass therethrough.   The control circuit according to claim 1, wherein the control circuit controls the driving circuit to change a light emitting state of the light emitting diode based on a sensing signal output from the sensing circuit according to the external information. Light emitting diode lighting device.   The light-emitting diode illuminating apparatus according to claim 1, wherein the external information is ambient brightness.   The light emitting diode illumination device according to claim 1, wherein the external information is a remote signal transmitted from a remote controller to the sensing circuit.   The light-emitting diode illuminating device according to any one of claims 1 to 4, further comprising a fitting that can be attached to a fluorescent tube lighting fixture.

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