JP2011249265A - Led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device with color unevenness alleviated.SOLUTION: A lighting fixture 1000 as one embodiment of an LED lighting device is provided with a plurality of LEDs arranged in a row on a substrate, a reflector 400 reflecting light emitted by each LED, and a translucent cover 500 covering the plurality of LEDs arranged in a row. An irradiation area on a face of the translucent cover 500 at a substrate side by direct light emitted from one LED (1) out of two LEDs interposing one LED (2) and reflection light that is the direct light reflected at a reflecting part 4021 of the reflector 400 overlaps in a range 12 a part of an irradiation area on a face of the translucent cover 500 on a substrate side by direct light emitted from the other LED (3) and reflection light that is the direct light reflected at the reflecting part 4021 of the reflector 400.

Description

  The present invention relates to an LED illumination device using an LED as a light source.

  Conventionally, there has been an illuminating device that can change the color temperature by arranging two or more types of LED light sources having different color temperatures on a substrate and controlling the light output of any or all of the LED light sources (for example, Patent Document 1) . However, in a general Blue-YAG white LED, an LED light source having a low color temperature has a lower luminous flux than an LED light source having a high color temperature, and therefore, the illuminance fluctuation range becomes large. Further, when the light output of any LED light source is turned off, the directivity angles do not overlap and light unevenness occurs.

  Further, if the LED having a high color temperature and the LED having a low color temperature are controlled at a ratio of 1: 1 in the working space, the fluctuation width of the color temperature becomes large.

JP 2009-206037 A

  An object of the present invention is to provide an LED lighting device in which unevenness of light and color unevenness are reduced.

The LED lighting device of this invention is
A plurality of LEDs arranged in a row on the substrate;
A reflection part for reflecting the light emitted from each LED;
A translucent cover covering the plurality of LEDs arranged in the row,
Each LED of the plurality of LEDs is
Radiate light toward the substrate-side surface of the translucent cover;
The substrate side of the translucent cover including direct light emitted from one of the two LEDs sandwiching one LED between each other and reflected light from which the direct light is reflected by the reflecting portion The irradiation area on the surface of the transparent cover overlaps with the irradiation area on the surface of the translucent cover including the direct light emitted from the other LED and the reflected light of the direct light reflected by the reflecting portion. It is characterized by that.

  According to the present invention, it is possible to provide an LED lighting device in which unevenness of light and color unevenness are reduced.

FIG. 3 is a perspective view of the lighting apparatus 1000 according to the first embodiment. Sectional drawing of the transversal direction of the LED unit arrange | positioned in the lighting fixture 1000 of Embodiment 1. FIG. Sectional drawing of the longitudinal direction of the LED unit arrange | positioned in the lighting fixture 1000 of Embodiment 1. FIG. FIG. 4 is an enlarged view of a range 11 in FIG. 3. FIG. 3 is a circuit block diagram of the lighting unit 200 according to the first embodiment. The figure which shows the light emission part of the translucent cover 500 of Embodiment 1, and the light emission state of an LED module. Sectional drawing of the longitudinal direction at the time of using the other reflector of Embodiment 1. FIG. The X direction arrow view of the LED unit of Embodiment 1. FIG. The figure which shows the light emission part of the translucent cover 500 in the lighting fixture 1000 of Embodiment 2, and the light emission state of an LED module. FIG. 6 is a diagram for explaining a color temperature ratio according to the second embodiment.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS.
FIG. 1 is a perspective view of a lighting fixture 1000.
FIG. 2 is a cross-sectional view of the LED unit arranged in the lighting fixture 1000 in the short direction.
FIG. 3 is a cross-sectional view in the longitudinal direction of an LED unit disposed in the lighting fixture 1000.
FIG. 4 is an enlarged view of a range 11 indicated by a broken line in FIG.
FIG. 5 is a circuit block diagram of the lighting unit 200.
FIG. 6 is a diagram illustrating a light emitting portion of the translucent cover 500 and a light emitting state of the LED module.
FIG. 7 is a cross-sectional view in the longitudinal direction when another reflector is used.
FIG. 8 is a diagram showing an X direction arrow of the LED unit.

(Outline of lighting fixture 1000)
A lighting fixture 1000 shown in FIG. 1 includes a fixture main body 100, a lighting unit 200 attached in the fixture main body 100, an LED module 300 electrically connected to the lighting unit 200 and disposed in the fixture main body 100, and a fixture. The reflector 400 attached to the mounting surface of the LED module 300 in the main body 100 and the translucent cover 500 attached to cover the front surface of the reflector 400 are provided. A configuration including the lighting unit 200, the LED module 300, the reflector 400, and the translucent cover 500 is referred to as an LED unit. FIG. 2 is a cross section in the short direction of the LED unit, and FIG. 3 is a cross section in the longitudinal direction of the LED unit (the lighting unit 200 is omitted).

(Lighting unit 200)
As shown in FIG. 5, the lighting unit 200 has two output systems (a first lighting circuit 220 and a second lighting circuit 230), and the output power of each output system becomes variable independently by the controller unit 240. ing.

  As shown in FIG. 5, the LED module 300 includes a first LED group 310, a second LED group 320, and an LED substrate 330 on which the first LED group 310 and the second LED group 320 are mounted. The first LED group 310 is electrically connected to the first lighting circuit 220 that is one output system of the lighting unit 200, and the second LED group 320 is connected to the second lighting circuit 230 that is the other output system of the lighting unit 200. Electrically connected.

  The first LED group 310 includes six first LED chips 311 (hereinafter also referred to as first LED elements 311). The second LED group 320 includes six second LED chips 321 (hereinafter also referred to as second LED elements 321).

  Next, the operation of the lighting unit 200 will be described with reference to FIG. The lighting mode switching unit 251 of the setting unit 250 switches the lighting mode 1, the lighting mode 2, and the lighting mode 3. In the lighting mode 1, both the first LED group 310 and the second LED group 320 are lit, in the lighting mode 2, only the first LED group 310 is lit, and in the lighting mode 3, only the second LED group 320 is lit. is there. Further, the illuminance is adjusted by the variable resistor 252.

  The controller unit 240 (lighting control unit) lights the first LED group 310 and the second LED group 320 with the lighting mode set by the lighting mode switching unit 251 and the brightness specified by the variable resistor 252.

(LED arrangement)
FIG. 8 is a view showing a state seen from the X direction of FIG. 1 with the translucent cover 500 removed. As shown in FIGS. 8 and 3, the second LED elements 321 constituting the second LED group 320 are arranged between the individual first LED elements 311 of the first LED group 310 mounted on the LED substrate 330. Is done. That is, on the LED substrate 330, as shown in FIG. 8, the first LED elements 311 constituting the first LED group 310 and the second LED elements 321 constituting the second LED group 320 are linear (one row). To be implemented alternately. In FIG. 3, W1 is the first LED element 311 and W2 is the second LED element 321. As shown in FIG. 3, the arrangement pitch of the LEDs on the substrate is “a”.

(Reflector 400)
As shown in FIG. 8, the reflector 400 has a substantially rectangular front surface, and includes 12 openings 401 (six are shown in FIG. 8) into which the first LED chip 311 and the second LED chip 321 are inserted. ) And a reflection part 402 that reflects light emitted from the first LED chip 311 and the second LED chip 321 around the opening 401.

(Reflecting part 4201, 4202)
As shown in FIG. 8, the reflector 402 includes two first reflectors 4021 provided in the longitudinal direction of the reflector 400 and two second reflectors 4022 provided in the short direction of the reflector 400. Become.

(Intersection A of shading angle)
The intersection of the light shielding angles will be described with reference to FIG. 4 which is an enlarged view of FIG. FIG. 4 is an enlarged view of a range 11 in FIG. 3 and simplifies the shape of the first reflecting portion 4021. In FIG. 4, the LEDs are shown as LED (1) to LED (3). If LED (1) is the first LED element 311, LED (3) is also the first LED element 311. If LED (1) is the second LED element 321, LED (3) is also the second LED element 321. is there. As shown in FIGS. 3 and 4, the first reflector 4201 is configured such that the intersection A of the light shielding angles of the adjacent first LED elements 311 (or the adjacent second LED elements 321) is the same as the translucent cover 500 and the reflector. It is formed at a height and angle θ ₂ between 400 and 400. That is, the distance d from the first LED element 311 (or the second LED element 321) to the intersection A of the light shielding angle is the distance d, and the distance from the first LED element 311 (or the second LED element 321) to the translucent cover 500. Is the distance b, the relationship between the distance d and the distance b is
Distance d <distance b
It becomes.
That is, as shown in FIG. 4, each LED of the plurality of LEDs emits light toward the substrate side surface 501 that is the surface of the translucent cover 500 on the LED substrate 330 side. In this case, a surface stretched by two straight lines in both a line direction in which a plurality of LEDs are arranged (Y direction) and a direction perpendicular to the LED arrangement surface (corresponding to the straight line L1) of the LED substrate 330 (X direction). The product A · tan θ of the light shielding angle θ when viewed from the normal direction (Z direction) and the distance A in the direction of one row (Y direction) with the adjacent adjacent LED is equal to the light emitting surface position of the other adjacent LEDs and the transparent surface. The distance B is smaller than the distance B in the vertical direction (X direction) with respect to the LED placement surface of the LED substrate 330 with respect to the substrate side surface 501 of the optical cover 500.
That is,
A · tan θ <B (Formula 1)
It is.
here,
A: Distance in the Y direction between the reference LED (each LED) and the adjacent LED,
θ: the light shielding angle on the side of the adjacent LED of the reference LED when viewed from the normal direction,
B: The distance in the X direction between the light emitting surface of the adjacent LED and the substrate side surface 501.
For example, if the reference LED is LED (3) and the adjacent LED is the left adjacent LED (2),
About LED (3), LED (2)
A → a,
θ → θ ₂ ,
B → b,
Because
a · tan θ ₂ <b
It becomes. Similarly, when the adjacent LED is the LED (not shown) on the right side of LED (3), (Equation 1) holds. In FIG. 4, the intervals between the LEDs are equal to the distance a, and the light shielding angle is θ ₂ for each LED. The pitch may not be equal, and the LEDs may not have the same light shielding angle. The above (Formula 1) may be established between the reference LED and the adjacent LED.

  Therefore, when the adjacent first LED elements 311 (when the first LED elements 311 are LED (1) and LED (3)) emit light, the irradiation areas reflected in the translucent cover 500 overlap each other ( Range 12 in FIG. In addition, when adjacent second LED elements 321 (when the second LED element 321 is LED (1) and LED (3)) emit light, the irradiation areas reflected in the translucent cover 500 also overlap each other. (Range 12 in FIG. 4).

  As described above, the direct light and the direct light emitted from one LED (1) of the two LEDs (1) and the LED (3) sandwiching one LED (2) between each other are reflected on the reflector 400. The irradiation area on the substrate-side surface of the translucent cover 500 by the reflected light reflected by the one reflecting portion 4021 is the first reflection of the reflector 400 by direct light and direct light emitted from the other LED (3). The region 12 overlaps a part of the irradiation area on the substrate side surface of the translucent cover 500 by the reflected light reflected by the portion 4021.

(Light of translucent cover 500)
Next, the light of the translucent cover 500 in this Embodiment 1 is demonstrated.
FIG. 6 is a diagram showing light that hits the translucent cover 500 in the lighting fixture 1000 of the first embodiment and the light emission state of the LED module (LED element). FIG. 6 is a view in the X direction of FIG. In FIG. 6, W1 is the first LED chip 311 and W2 is the second LED chip 321. Although it is assumed that the color temperatures of W1 and W2 are different, the color temperatures may be the same.

6A shows a state in which the LED chip W1 constituting the first LED group 310 and the LED chip W2 constituting the second LED group 320 are lit simultaneously (the arrangement of the translucent cover 500). Light).
FIG. 6B shows a light emission state of the LED module 300 in FIG.

FIG. 6C shows a state in which the LED chip W1 constituting the first LED group 310 is turned on and the LED chip W2 constituting the second LED group 320 is turned off (the arrangement of the translucent cover 500). Light).
(D) of FIG. 6 has shown the light emission state of the LED module 300 in (c).

  As shown in FIG. 6C, even when the first LED group 310 is turned on and the second LED group 320 is turned off, irradiation with the LED (1) and the LED (2) is performed as described in FIG. Since the areas partially overlap, the translucent cover 500 has substantially uniform brightness. The same applies to the case where the first LED group 310 is turned off and the second LED group 320 is turned on.

  In addition, when both the first LED group 310 and the second LED group 320 are lit, as shown in FIG. 4, the intersection (light shielding angle) of the light emitted by the adjacent LED chips W1 constituting the first LED group 310. The LED chip W2 constituting the second LED group 320 (corresponding to the LED (2) in FIG. 4) is arranged on the vertical line of the intersection A), and the light emitted from the LED chip W2 constituting the second LED group 320 Since the LED chip W1 constituting the first LED group 310 is disposed on the vertical line of the intersection, the translucent cover 500 has substantially uniform brightness.

  The shape of the first reflecting portion of the reflector 400 may be as shown in FIG. That is, the first reflecting portion 4021 in the range 13 indicated by the dashed box in FIG. 3 is a reflecting surface having a curvature, but the first reflecting portion 4021 in the range 14 indicated by the broken line in FIG. 7 is a flat surface. That is, the first reflecting portion 4021 may be a surface having a curvature or a flat surface. In this way, even when a reflector that changes the directivity from the LED light source is used, it can be overlaid with the light distribution of the LED from which one direct light from the LED light source is skipped. Almost uniform brightness with little unevenness and color unevenness can be obtained.

Embodiment 2. FIG.
In the second embodiment, among the LED modules of the first embodiment, a plurality of light colors of LED chips constituting the first LED group 310 are used.

  As shown in FIG. 9, the first LED group 310 includes a first light color LED chip W1 having a color temperature of, for example, 5000 [K] (K (Kelvin) is denoted as [K]) and 3000 [K]. Second light color LED chip R, and first light color LED chip W1 and second light color LED chip R are alternately arranged. All the second LED groups 320 are the first light color LED chips W1, but in FIG. 9, “W2” is used to indicate that they are LEDs of the second LED group 320. That is, in FIG. 9, W2 has the same color temperature as W1.

Here, the LED module 300 is a board having two circuits (first lighting circuit 220 and second lighting circuit 230) capable of controlling output by skipping one LED chip arranged in a row, and x is an integer. LED light sources with different color temperatures (5000 [K] and 3000 [K])
H (5000 [K]): L (3000 [K]) = 2x + 1: 1
(For example, 3: 1 when x = 1, 5: 1 when x = 2, 7: 1 when x = 3,...).

FIG. 10 is a diagram schematically illustrating the above “2x + 1: 1”. The left side of FIG. 10 shows the first LED group 310, and the right side shows the second LED group 320. The hatched portion of the first LED group 310 indicates the second light color LED chip R, and the portion without the hatched line indicates the first light color LED chip W1. The second LED group 320 is entirely the first light color LED chip W1. The case where the first line is x = 1 and the second line is x = 2 is shown. The same applies to the other lines. As shown in FIG. 10, when the number of LEDs in the first LED group 310 and the second LED group 320 is the same,
x = 1 corresponds to the case where each LED group is divided into two,
x = 2 corresponds to the case where each LED group is divided into three,
x = 3 corresponds to the case where each LED group is divided into four.
The same applies hereinafter.

The upper limit color temperature is the case where only the LED on the 2X + 1 side (only the second LED group 320) emits light, and is H [K].
Also, if the output of both lighting circuits in the brightest case is 100%,
{(2X + 1) H + L} / (2X + 2) [K]
The lower limit color temperature is
H: L = X: 1
In case
(HX + L) / (X + 1) [K]
become.

  For example, if 5000 [K] and 3000 [K] are arranged at a ratio of 3: 1, the circuit on both sides is 100% (when both the first lighting circuit 220 and the second lighting circuit 230 are 100% output), and 4500 [ K]. This corresponds to the first line in FIG.

  Also, by turning off the first lighting circuit 220, only the 5000 [K] LED light source (second LED group 320) emits light.

  On the other hand, by turning off the second lighting circuit 230, as shown in the first row of FIG. 10, 5000 [K]: 3000 [K] emits light at a ratio of 1: 1, and the color temperature is 4000 [K]. It becomes.

As described above, when the LED light sources having different color temperatures are arranged on the substrate at the ratio of “2X + 1: 1” in the arrangement shown in FIG. 10, when the first lighting circuit 220 that lights the first LED group 310 is turned off. The same LED light source (second LED group 320) emits light.
Conversely, when the second lighting circuit 230 that lights the second LED group 320 is turned OFF, the first light color LED chip W1 and the second light color LED chip R, which are LED light sources having different color temperatures, are “X: 1 "emits light.

  If illuminance is required, “2X + 1” LED light sources having a high color temperature are arranged.

  Further, in order to suppress the illuminance, “2X + 1” LED light sources having a low color temperature are arranged.

  According to Embodiment 2, it is possible to change the color temperature, and it is possible to provide an LED lighting apparatus with little color unevenness even when the color temperature is changed.

  According to the lighting apparatus of Embodiment 2, by turning off the output of the first lighting circuit 220, only one type of LED light source emits light, and by turning off the output of the second lighting circuit 230, X: 1 LED light sources with different color temperatures can emit light at a ratio of.

  According to the lighting apparatus of the second embodiment, it is possible to provide a lighting apparatus having various illuminances and color temperatures by arranging two types of LED light sources having different color temperatures at a ratio of “2x + 1: 1”.

  According to the lighting fixture (LED lighting device) of the second embodiment, it is suitable for the environment by reducing the unevenness of light and the unevenness of color and by giving the mixing ratio of the color temperature a constant ratio “2x + 1: 1”. Color temperature and illuminance can be provided.

  A Intersection of light shielding angle, 11, 12, 13, 14 range, 1000 lighting fixture, 100 fixture body, 200 lighting unit, 210 AC / DC converter, 220 first lighting circuit, 230 second lighting circuit, 240 controller unit, 250 Setting unit, 251 lighting mode switching unit, 252 variable resistance, 300 LED module, 310 first LED group, 311 first LED element, 320 second LED group, 321 second LED element, 330 LED substrate, 400 reflector, 401 An opening part, 402 reflection part, 4021 1st reflection part, 4022 2nd reflection part, 500 A translucent cover.

Claims (6)

A plurality of LEDs arranged in a row on the substrate;
A reflection part for reflecting the light emitted from each LED;
A translucent cover covering the plurality of LEDs arranged in the row,
Each LED of the plurality of LEDs is
Light is emitted toward the surface of the translucent cover on the side of the substrate, and is stretched by two straight lines in both the direction of the row and the direction perpendicular to the LED arrangement surface of the plurality of LEDs of the substrate. The product A · tan θ of the light shielding angle θ when viewed from the normal direction of the surface to be obtained and the distance A in the one-row direction with the adjacent other LED is the other LED and the translucent cover, The LED illumination device characterized by being smaller than the distance B of the said board | substrate perpendicular | vertical with respect to the said LED arrangement surface. A plurality of LEDs arranged in a row on the substrate;
A reflection part for reflecting the light emitted from each LED;
A translucent cover covering the plurality of LEDs arranged in the row,
Each LED of the plurality of LEDs is
Radiate light toward the substrate-side surface of the translucent cover;
The substrate side of the translucent cover including direct light emitted from one of the two LEDs sandwiching one LED between each other and reflected light from which the direct light is reflected by the reflecting portion The irradiation area on the surface of the transparent cover overlaps with the irradiation area on the surface of the translucent cover including the direct light emitted from the other LED and the reflected light of the direct light reflected by the reflecting portion. The LED lighting device according to claim 1. The LED lighting device
As the plurality of LEDs, a first LED group composed of a plurality of LEDs, and a second LED group composed of a plurality of LEDs alternately arranged on the substrate with respect to the LEDs of the first LED group,
The LED lighting device further includes:
A first lighting unit for lighting the first LED group;
A second lighting unit for lighting the second LED group;
The lighting control part which controls the light output of said 1st LED group and said 2nd LED group through control of said 1st lighting part and said 2nd lighting part was provided, The lighting control part characterized by the above-mentioned. LED lighting apparatus of description. The first LED group is:
It consists of an LED with a first color temperature and an LED with a second color temperature,
The second LED group is:
The first color temperature LED;
In the whole of the first LED group and the second LED group, the ratio of the number of the LEDs having the first color temperature and the LED having the second color temperature is:
The LED lighting device according to claim 3, wherein 2X + 1: 1 (X is an integer of 1 or more). The color temperature of the LEDs constituting the first LED group and the color temperature of the LEDs constituting the second LED group are:
The LED lighting device according to claim 3, which is different. The color temperatures of the LEDs constituting the first LED group are all the first color temperature,
6. The LED lighting device according to claim 5, wherein the color temperatures of the LEDs constituting the second LED group are all the second color temperature.

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