JP2009117315A - LED lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an irradiation range of illumination light freely adjustable in an LED illumination device using a plurality of LED light-emitting units. <P>SOLUTION: The LED illumination device 1 is equipped with the plurality of the LED light-emitting units 2 and a mounting substrate 3 on which these light-emitting units 2 are mounted, and the plurality of the light-emitting units 2 are mounted on the mounting substrate 3 via optical axis varying devices 4 that make the respective optical axes variable. By adjusting the optical axis varying devices 4, the respective optical axes of the plurality of the light-emitting units 2 become variable, and the irradiation range of the illumination light can be freely adjusted. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an LED lighting device including a plurality of LED light emitting units.

  Conventionally, instead of incandescent lamps and fluorescent lamps, LED lighting apparatuses using light-emitting diodes (LEDs) with low power consumption as light sources have been proposed. However, the amount of light of a single LED is less than that of an incandescent lamp or a fluorescent lamp. Therefore, in this type of LED lighting device, generally, a plurality of LEDs are used, and these are arranged at predetermined positions, thereby realizing a desired illuminance as the lighting device (see, for example, Patent Document 1). . However, if the output of a plurality of LEDs is constant, the irradiation surface becomes brighter as it gets closer to the illumination device, becomes darker as it gets farther, and the illuminance becomes uneven. Therefore, in the lighting device described in Patent Document 1, the illuminance distribution can be controlled by adjusting the output of each LED.

The structure of the illumination device described in Patent Document 1 is shown in FIGS. In the lighting device 101, a plurality of LED lamps 102 (102 a to 102 d) are disposed at predetermined positions of the mounting portion 105, and different numbers of resistors R are connected to the power supply circuit of each LED lamp 102. By setting different resistance values for the respective LED lamps 102 by these resistors R, the output of each LED lamp 102 can be appropriately adjusted, and a desired illuminance distribution can be realized.
JP 2001-155508 A

  However, in the illumination device 101 disclosed in Patent Document 1, since the LED lamp 102 is fixed to the mounting portion 105, the direction of the optical axis of the LED lamp 102 is constant. Therefore, the light distribution of the LED lamp cannot be controlled according to the usage environment of the lighting device, and the irradiation range of the illumination light is determined in advance, so that the versatility as the lighting device is low.

  The present invention solves the above-described problems, and provides a highly versatile LED lighting device capable of freely adjusting the illumination light irradiation range by appropriately controlling the light distribution according to the use environment. The purpose is to do.

  In order to solve the above-mentioned problems, the invention of claim 1 is an LED lighting device comprising a plurality of LED light emitting units and a mounting substrate to which the LED light emitting units are attached, wherein the plurality of LED light emitting units are It is mounted on the mounting substrate via an optical axis variable device that makes each optical axis variable.

  According to the first aspect of the present invention, since the optical axis of the plurality of LED light emitting units can be made variable by the optical axis variable device, the illumination light irradiation range can be freely adjusted.

  An LED lighting device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. The LED lighting device 1 of the present embodiment includes a plurality of LED light emitting units 2 (hereinafter referred to as light emitting units) and a mounting substrate 3 to which the light emitting units 2 are attached, and the plurality of light emitting units 2 have their respective optical axes. It is mounted on the mounting substrate 3 via an optical axis variable device 4 that can change (shown by a one-dot chain line). In FIG. 1, the optical axis variable device 4 is adjusted in accordance with the arrangement position of each light emitting unit 2 to show a state in which the respective optical axis directions are made different. In FIG. 2, each light emitting unit 2 (indicated by a solid line) whose optical axis direction is substantially horizontal, and each light emitting unit 2 (indicated by a two-dot chain line) whose optical axis direction is changed obliquely upward. The optical axis after changing the optical axis is indicated by a two-dot chain arrow. As described above, each light emitting unit 2 is configured to be able to arbitrarily vary the respective optical axes by adjusting the optical axis variable device 4.

  The light emitting unit 2, the mounting substrate 3, and the optical axis changing device 4 are housed in a housing 5 having an opening on the front surface, and a front cover 6 is attached to the opening of the housing 5. Since the LED lighting device 1 of this example is used as a light-up projector, an arm 7 a for fixing the LED lighting device 1 to the installation surface F is installed in the housing 5. The LED lighting device 1 is connected to a commercial power source via a power cord 8. 1 to 3 show the light emitting surface of the LED lighting device 1 having a square shape, the present invention is not limited thereto, and the shape of the light emitting surface may be circular, for example. .

  The housing 5 includes a pedestal (not shown) for fixing the mounting substrate 3 therein. As the material of the housing 5, a steel plate, stainless steel, aluminum, reinforced plastic, or the like is appropriately used according to the installation environment or application. In addition, the housing 5 incorporates and protects the power cord 8 and the wiring components connected to the light emitting unit 2. The front cover 6 is for covering the front surface of the light emitting unit 2. As the material of the front cover 6, a light-transmitting material having high transparency such as glass, acrylic, or polycarbonate is used. Note that the front cover 6 is not essential, and depending on the installation environment of the LED lighting device 1, the front cover 6 may be removed and the inside of the housing 5 may be opened. For example, stainless steel or the like is used as the material of the arm portion 7a.

  Specific configurations of the light emitting unit 2 and the optical axis varying device 4 will be described with reference to FIGS. 4 (a) to 4 (c) and FIG. The light emitting unit 2 includes an LED 20 that is a light emitting portion, an LED substrate 21 for mounting the LED 20, a power supply unit 22 that converts a commercial power source into a rated voltage of the LED 20, a lens 23 that controls light distribution of the LED 20, And a light emitting unit main body 24 for fixing and protecting them. The optical axis variable device 4 includes a horizontal member 41 having a first rotating shaft 4a that rotates in the horizontal direction with respect to the mounting substrate 3 (see FIG. 2), and a second member that rotates in the vertical direction with respect to the mounting substrate 3. And a pair of vertical members 42 having a rotation shaft 4b. In the optical axis variable device 4, the horizontal member 41 is rotatably attached to a predetermined position of the attachment substrate 2.

  The light emitting unit 2 is positioned by being sandwiched by a pair of vertical members 42. As shown in FIG. 4B, the light emitting unit 2 rotates about the first rotating shaft 4a, so that the horizontal optical axis angle is variable and rotates about the second rotating shaft 4b. As a result, as shown in FIG. 4C, the optical axis angle in the vertical direction is variable. By appropriately adjusting the angles in the horizontal direction and the vertical direction, the light emitting unit 2 can adjust the optical axis with respect to the direction of the solid angle ω≈2Π (pi) [sr].

  The optical axis variable device 4 is manually operated when the LED lighting device 1 is installed, and is adjusted so that the optical axes of the plurality of light emitting units 2 are in a predetermined direction. The LED lighting device 1 includes a driving device (not shown) that rotates the horizontal member 41 and the pair of vertical members 42 around the first and second rotating shafts 4a and 4b. The light distribution control may be performed. In this case, preferably, the drive device includes a control unit including a microcomputer and a trigger signal input unit, and upon receiving a trigger signal according to a user instruction or the like, the control unit responds to the trigger signal by the members 41, 42 is driven.

  The LED 20 is mounted on the LED substrate 21 such that its optical axis is perpendicular to the LED substrate 21. FIG. 4A shows an example in which four LEDs 20 are mounted on the LED substrate 21, but the number of LEDs 20 is not particularly limited. These LEDs 20 may have different emission colors or may be monochromatic.

  The LED substrate 21 is preferably one that can mount a plurality of LEDs 20. As a material of the LED substrate 21, a glass epoxy resin is mainly used. A diode, a capacitor, a resistor (not shown), and the like are mounted on the back surface of the LED substrate 21. The power supply unit 22 includes a power supply circuit including a transformer, a rectifier, a stabilization circuit, and the like that convert commercial power into the rated voltage of the LED 20. The power supply unit 22 is connected to a commercial power supply via a power connection lead wire 25. The light emitting unit main body 24 is preferably made of porcelain.

  The lens 23 refracts and emits the light incident from the LED 20 to control the light distribution of the light emitted from the LED 20. In the present embodiment, as shown in FIG. 5, one lens 23 may be provided for the plurality of LEDs 20, or individual lenses may be provided for the respective LEDs 20. As the material of the lens 23, a translucent acrylic resin is used. The lens 23 controls the light distribution of the light from the LED 20, but does not change its optical axis. Therefore, the optical axis of the LED 20 extends in the vertical direction with respect to the LED substrate 21. The light distribution characteristics of the lens 23 are a narrow angle type (1/2 beam angle: less than 28 °), a narrow angle type (1/2 beam angle: 28 ° to less than 38 °), and a medium angle type (1/2 beam). Angle: 38 ° or more and less than 54 °), Wide angle type (1/2 beam angle: 54 ° or more and less than 74 °), Extra wide angle type (1/2 beam angle: 74 ° or more), etc.

  Here, the relationship between the light distribution of the light source and the 1/2 beam angle will be described with reference to FIG. A direction line L2 connecting a point P where the horizontal plane illuminance on a certain horizontal plane F becomes 1/2 of the illuminance below the optical axis L1 with the light emission center by light distribution when the optical axis L1 of the light source L is vertical, An angle formed with the optical axis L1 is referred to as a ½ irradiation angle, and an angle twice this ½ irradiation angle is referred to as a ½ beam angle. That is, the light emitting unit 2 including the lens 23 having a narrow 1/2 beam angle has high directivity and can irradiate light with high illuminance in a narrow range. In addition, the light emitting unit 2 including the lens 23 having a 1/2 beam angle that is a wide angle can irradiate light with a relatively low illuminance over a wide range. The LED lighting device 1 is preferably used by appropriately combining a plurality of light emitting units 2 provided with lenses having different light distributions among these light emitting units 2.

  Next, operation | movement of the LED lighting apparatus 1 is demonstrated with reference to Fig.7 (a) thru | or (c). In FIG. 7A, the optical axis variable device 4 is adjusted, and each optical axis of the plurality of light emitting units 2 is projected onto the wall surface W when controlled so as to be substantially perpendicular to the mounting substrate 3. The example of the irradiation surface R is shown. This light distribution is effective when illuminating a horizontally long rectangular signboard or the like. Further, by directing the optical axes of the plurality of light emitting units 2 in the horizontal direction with respect to the installation surface F, a wider light distribution can be obtained. FIG. 7B shows an example of light distribution when the optical axes of the plurality of light emitting units 2 are concentrated in the substantially central direction of the irradiation surface R. This light distribution is suitable for irradiating a certain point in a spot manner. As described above, since the light emitting unit 2 can control the optical axis with respect to the direction of the solid angle ω≈2Π (pi) [sr], even if the light emitting surface of the LED illumination device 1 is square. Further, by controlling the optical axis of the light emitting unit 2 provided at the corner in a substantially central direction, the light distribution that makes the shape of the irradiation surface R projected onto the wall surface W circular, as shown in FIG. In addition, it is possible to realize a light distribution in which the irradiation surface R is circular in a wide range.

  As described above, the LED lighting device 1 can realize light distribution that is greatly different by one LED lighting device by controlling each optical axis of the plurality of light emitting units 2 in a solid angle. Therefore, the illumination light irradiation range and its shape can be freely adjusted according to the installation environment, and it has high versatility that can be used for a wide variety of applications.

  Next, a modification of the LED lighting device 1 of the present embodiment will be described with reference to FIGS. 8 (a) and 8 (b) and FIGS. 9 (a) to 9 (c). This modification is used for a streetlight or the like, and includes an arm portion 7b for connecting to a streetlight post portion 9. 8A and 8B show the LED light emitting device 1 having a circular light emission surface, but the shape is not limited to this, and the shape may be the above-described square shape.

  Also in the LED lighting device 1 of this modification, as in the above-described embodiment, the optical axis variable device 4 is appropriately adjusted, and each optical axis of the plurality of light emitting units 2 is controlled. For example, as shown in FIG. 9A, the light distribution of each light emitting unit 2 can be made omnidirectional, and the irradiation surface R projected onto the ground E can be made circular. Moreover, as shown in FIG.9 (b), the front light distribution from which the irradiation surface R becomes a fan shape, and the wide light distribution from which the irradiation surface R becomes a rectangle as shown in FIG.9 (c) is also possible.

  The present invention is not limited to the above-described configuration, and various modifications can be made. For example, the optical axis of each light emitting unit 2 may be adjusted individually, or when the optical axis of a certain light emitting unit 2 is adjusted, the optical axis of another light emitting unit 2 is adjusted in conjunction with the drive device described above. It may be configured to be.

The half-cut front view of the LED lighting apparatus which concerns on one Embodiment of this invention. The partially broken side view of the LED lighting device. The perspective view of the LED lighting device. (A) is a perspective view of the light emitting unit and optical axis variable device of the LED illumination device, (b) is a top view thereof, and (c) is a side view thereof. The sectional side view of the light emission unit of the LED lighting apparatus. The figure explaining the relationship between the light distribution of a light source, and a 1/2 beam angle. (A) thru | or (c) is a figure which shows the example of the irradiation surface by the illumination light of the LED lighting apparatus. (A) is the partially broken side view of the modification of the LED lighting device, (b) is the partially broken bottom view. (A) thru | or (c) is a perspective view which shows the example of the irradiation surface by the illumination light of the modification. (A) is a sectional side view of a conventional LED lighting device, (b) is a circuit configuration diagram of the device.

Explanation of symbols

1 LED lighting device 2 LED light emitting unit 20 LED
3 Mounting board 4 Optical axis variable device

Claims (1)

An LED lighting device comprising a plurality of LED light emitting units and a mounting substrate to which the LED light emitting units are attached,
The LED lighting device, wherein the plurality of LED light emitting units are mounted on the mounting substrate via an optical axis variable device that makes each optical axis variable.

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