JP6527982B1 - LED lighting device - Google Patents

Abstract

The present invention provides an LED lighting device capable of realizing a color change similar to that of an incandescent lamp in light control with a simple configuration without increasing the number of parts by improving the number and arrangement of LEDs. An LED lighting device includes a substrate, a first LED chip disposed on the substrate, and a second LED disposed on the substrate and having a color temperature lower than that of the first LED chip. The number of first LED chips CW is greater than the number of second LED chips WW, and the first LED chips CW and the second LED chips WW are substantially concentric in plan view. The first LED chips CW are arranged on the upper side, and the second LED chips WW are arranged on the inner side so as to be offset from the concentric circles. [Selected figure] Figure 1

Description

  The present invention relates to an LED lighting device, and more particularly to an LED lighting device capable of achieving the same color change as an incandescent lamp in dimming.

  In recent years, LED lighting devices use light emitting diodes (hereinafter referred to as "LEDs"), which consume less power and have a longer life than conventional incandescent light bulbs, and therefore increase consumer awareness of ecology and save energy With the spread of measures, the range of use and uses are rapidly expanding.

  There is also a growing need to use LED lighting as an alternative to incandescent bulbs.

  By the way, in the case of a conventional incandescent lamp, when the conduction angle of the commercial AC voltage is narrowed by dimming operation using a phase control dimmer to darken the incandescent lamp, the temperature of the filament emitting light in the lamp is By lowering, the color temperature of the light emitted from the filament also becomes reddish.

  On the other hand, in the case of the LED lighting device, the color temperature does not change even if the current is reduced and then darkened. Therefore, in a hotel where there is a relatively large number of cases where light control is performed, As in the case of using a light bulb, it is desirable that the color temperature changes with light control using a phase control type light control device, whereby the atmosphere of the cabin can be maintained.

  As described above, various techniques have been proposed as LED lighting devices capable of achieving the same color change as incandescent bulbs during light control.

  For example, in Patent Document 1, an LED lamp that lights up by receiving a direct-current input current whose magnitude changes according to a light control operation, is connected in parallel to the first LED chip and the first LED chip. And a second LED chip that emits light having a color temperature lower than that of the first LED chip, and is connected in parallel to the first LED chip and in series to the second LED chip. LED lamps have been proposed which comprise an impedance circuit.

  According to this LED lamp, it is possible to provide an LED lamp with a simple circuit configuration capable of emitting light with low color temperature as well as dimming, as with an incandescent lamp (this technique is hereinafter referred to as Conventional Example 1 ).

  In Patent Document 2, a first light emitting means (white LED), a second light emitting means (colored LED) of a light emitting color different from the first light emitting means, and a control means for controlling the first and second light emitting means And the control means turns on the first light emitting means as the main lighting means in all light, and lights on the second light emitting means as the main lighting means at the time of dimming, and the first or second light emitting means There has been proposed an LED lighting device in which any one of the light emission colors is white, and the brightness and light emission color in all light, and the brightness and light emission color in light control are continuously changed.

In this LED lighting device, white LEDs and colored LEDs are alternately disposed evenly, and as an alternative to incandescent bulbs, white can be used when it is bright, and bulb color can be used when it is dark, and white LEDs It is said that the colored LEDs of the light bulb color can be obtained by averaging their respective brightness (hereinafter, this technique is referred to as Conventional Example 2).
JP, 2015-2034, A JP 2004-111104 A

  In the prior art 1, since it is necessary to use an impedance circuit (constant current circuit of an air-cooling fan) connected in series to the second LED chip, the number of parts is increased and the size of the apparatus is increased and the cost is increased. There was a problem of leading to

  In the second prior art, since the white LEDs and the colored LEDs are arranged "three-dimensionally" alternately and uniformly (see FIG. 4 of the publication), the structure and the wiring pattern become complicated, leading to an increase in cost. There was a problem.

  The present invention has been made to solve the above-mentioned problems, and by improving the number and arrangement of LEDs, the number of parts is not increased, and the configuration is simple and similar to the incandescent bulb in dimming. It is an object of the present invention to provide an LED lighting device capable of realizing various color changes.

The LED lighting device of the present invention is
A substrate,
A first LED chip disposed on the substrate;
A second LED chip disposed on the substrate and having a color temperature lower than that of the first LED chip;
The number of first LED chips is greater than the number of second LED chips,
The first LED chip and the second LED chip are arranged on a substantially concentric circle in plan view at intervals .
Wherein the first LED chip outside, offset from one another the second LED chips from said one concentric such that the inside are arranged adjacent to each other,
The adjacent first LED chip and the second LED chip are arranged to partially overlap
Being
It is characterized by

  The color temperature of the first LED chip may be 2600 to 3000 K, and the color temperature of the second LED chip may be 1600 to 1800 K.

  The LED lighting device may be a krypton ball type.

  It may be a silica sphere LED lighting device.

  According to the LED lighting device of the present invention, the following effects can be obtained.

  (1) Since the number of first LED chips is larger than the number of second LED chips, the second LED chip lights up earlier than the first LED chip when the dimming ratio is low. LED chips make it reddish like incandescent bulbs.

  In addition, the first LED chip and the second LED chip are disposed substantially concentrically in a plan view, and the first LED chip is offset from the concentric circle so that the first LED chip is outside and the second LED chip is inside. Since it is arranged, when the brightness is reduced by the dimmer, it becomes reddish lighting by the light of the second LED chip from the inside, and every time the brightness is increased by the dimmer, the brightness of the first outer LED chip is increased. The light wraps the light of the inner second LED chip. As a result, it is possible to provide an LED illumination device capable of realizing the same color change as an incandescent lamp in light control with a simple configuration without increasing the number of parts.

  (2) Since the light of the first LED chip and the light of the second LED chip are mixed appropriately, when the light is directed to the inside of the lamp, the light source portion of the internal LED chip is blurred without being emphasized And the quality of the lighting device is not degraded.

  (3) Various components can be arranged without arranging the LED chip in the center of the substrate, so that the design can be facilitated and the device can be miniaturized.

It is a top view showing roughly the arrangement pattern of the 1st LED chip on the substrate of the LED lighting device concerning the example of an embodiment of the present invention, and the 2nd LED chip. It is a top view showing the substrate of the krypton ball type LED lighting device concerning the example of an embodiment of the present invention. It is a top view showing the substrate of the LED lighting device of the silica ball type concerning the example of an embodiment of the present invention. It is a top view which shows roughly the wiring pattern on the substrate of the LED lighting device concerning the example of an embodiment of the present invention. (A) And (B) is explanatory drawing which shows roughly the example of the arrangement | positioning pattern of the 1st LED chip on the board | substrate of a LED lighting apparatus, and a 2nd LED chip. (A)-(D) are explanatory drawings which show roughly the example of the arrangement pattern of the 1st LED chip on the board | substrate of a LED lighting apparatus, and a 2nd LED chip. It is a side view showing the appearance of the LED device concerning the example of an embodiment of the present invention. It is a sectional view showing the internal structure of the LED device concerning the example of an embodiment of the present invention. It is a block diagram showing the composition of the LED lighting device concerning the example of an embodiment of the present invention. The LED lighting apparatus which concerns on the example of embodiment of this invention WHEREIN: It is a graph which shows the change of the operating voltage of a 1st LED chip and a 2nd LED chip according to the change of light control ratio.

  Hereinafter, embodiments of the present invention will be described. FIG. 1 is a plan view schematically showing an arrangement pattern of a first LED chip and a second LED chip on a substrate of an LED lighting device according to an embodiment of the present invention.

  The LED lighting device 1 according to the embodiment of the present invention is used as, for example, a krypton ball LED lighting device or a silica ball LED lighting device, and is disposed on a substrate 2 and the substrate 2 as shown in FIG. And a second LED chip WW disposed on the substrate 2 and having a color temperature lower than that of the first LED chip CW.

  The color temperature of the first LED chip CW is 2600 to 3000 K (unit: Kelvin), and for example, a 2800 K LED chip is used.

  The color temperature of the second LED chip WW is 1600 to 1800, and for example, an LED chip of 1800 K is used.

  The number of first LED chips CW is larger than the number of second LED chips WW. For example, the number of first LED chips CW is eight and the number of second LED chips WW is seven.

  Thus, when the first LED chip CW and the second LED chip WW are connected in series, and the first LED chip CW and the second LED chip WW are connected in parallel with each other, the divided voltages are obtained. Due to the difference between the operating voltage of the first LED chip CW and the operating voltage of the second LED chip WW, the timing at which the second LED chip WW lights up is earlier, and the timing at which the first LED chip CW lights up is later Therefore, the timing at which the second LED chip WW turns off is late, and the timing at which the first LED chip CW turns off is earlier.

  The first LED chip CW and the second LED chip WW are arranged substantially concentrically in a plan view, and concentric with the first LED chip CW outside and the second LED chip WW inside From each other. For example, it is preferable to arrange by shifting 50% or more with respect to the center.

  The adjacent first LED chips CW and the second LED chips WW are arranged to overlap each other, and preferably overlap, for example, by about 40% with respect to the lateral width.

  In FIG. 1, R1 and R2 are parts for resistance.

  FIG. 2 is a plan view showing the substrate 2 of the krypton ball type LED lighting device 1 according to the embodiment of the present invention.

  In FIG. 2, 3 is a screw as a fastening member for attaching the substrate 2, R1 and R2 are parts for resistance, and 4 is an electric wire for power supply.

  FIG. 3 is a plan view showing the substrate 2 of the silica sphere LED lighting device 1 according to the embodiment of the present invention.

  In FIG. 3, 3 is a screw as a fastening member for attaching the substrate 2, R1 and R2 are parts for resistance, and 4 is a wire for power supply.

  FIG. 4 is a plan view schematically showing a wiring pattern on a substrate of the LED lighting device according to the embodiment of the present invention. FIG. 4 shows a wiring pattern on the substrate of the krypton ball type LED lighting device, and in FIG.

  The inventor conducted experiments on the number and various arrangement patterns of the first LED chip CW and the second LED chip WW. As a result, by using the number and arrangement pattern of the first LED chip CW and the second LED chip WW as shown in FIG. I understand.

  5 (A) and 5 (B) are explanatory diagrams showing an example of the arrangement pattern of the first LED chip and the second LED chip on the substrate of the LED lighting device, and FIGS. 6 (A) to 6 (D) are LEDs It is explanatory drawing which shows the example of the arrangement | positioning pattern of the 1st LED chip and 2nd LED chip on the board | substrate of an illuminating device.

(1) When the first LED chip CW and the second LED chip WW are arranged concentrically, the first LED chip CW is arranged on the inner peripheral side, and the second LED chip WW is arranged on the outer peripheral side Case (refer to FIG. 5A and FIG. 6A)
In the case of this arrangement, the brightness is reduced by the dimmer, and in the lower limit region where the brightness is 10 to 20%, the red of the second LED chip WW is easily noticeable only on the outer periphery. The incandescent bulb is more reddish in the center when the brightness is reduced by the dimmer.

(2) When the first LED chip CW and the second LED chip WW are arranged concentrically, the first LED chip CW is arranged on the outer peripheral side, and the second LED chip WW is arranged on the inner peripheral side Case (refer to FIG. 5 (B) and FIG. 6 (B))
In this arrangement, when the brightness is reduced, the light turns reddish from the inside, and the light of the outer first LED chip CW is the light of the inner second LED chip WW as the brightness is increased by the dimmer. Wrap around. However, it is difficult to arrange and design the circuit pattern, the resistor, and the second LED chip WW closer to the center.

(3) When arranged in a strip shape and linearly (see FIG. 6C)
In the case of this arrangement, the reddish light at the time of the rise of the lighting is noticeable biased toward the center. In an incandescent lamp, the shape is close to a sphere and the filament is located inside.

(4) When arranged in a grid (in the case where the first LED chip CW and the second LED chip WW are arranged side by side (see FIG. 6D)
In this arrangement, the light of the first LED chip CW and the light of the second LED chip WW arranged side by side tend to mix with each other more than necessary. The incandescent bulb is similar in shape to a sphere and the filament is located inside.

  From the above, the first LED chip CW and the second LED chip WW are disposed concentrically in plan view, and the first LED chip CW is outside and the second LED chip WW is inside. Since they are arranged offset from each other from the concentric circles, they are discolored in the same manner as incandescent bulbs during light control, light balance is achieved, and component placement is facilitated. That is, when the brightness is reduced by the dimmer, the light from the inside becomes reddish due to the light of the second LED chip WW, and as the brightness is increased by the dimmer, the light of the first outer LED chip CW is Wraps the light of the inner second LED chip WW.

  In addition, since the light of the first LED chip CW and the light of the second LED chip WW are mixed appropriately, when the light is directed to the inside of the lamp, the light source portion of the internal LED chip is not emphasized. Because it looks blurry, the quality of the lighting device is not degraded.

  In addition, since various components can be arranged without arranging the LED chip in the central portion of the substrate 2, the design becomes easy.

  FIG. 7 is a side view showing the appearance of the LED device according to the embodiment of the present invention, and FIG. 8 is a cross-sectional view showing the internal structure of the LED device according to the embodiment of the present invention.

  As shown in FIGS. 7 and 8, the LED lighting device 1 according to the embodiment of the present invention includes a light emitting unit 6, a pedestal unit 7 supporting the light emitting unit 6, a heat radiating unit 8, and a power supply unit 9. The base portion 10 and the glove portion 11 are provided.

  As shown in FIG. 8, the light emitting unit 6 includes a short thin plate-like substrate 2 and first LED chips CW and second LED chips WW arranged in a predetermined number and arrangement pattern on the substrate 2. Have.

  The substrate 2 is made of, for example, a ceramic such as alumina. A plurality of first LED chips CW and second LED chips WW are mounted on the substrate 2, and a wiring pattern serving as a path for supplying power to the first LED chips CW and the second LED chips WW is provided. It is formed (see FIG. 4).

  The pedestal portion 7 is formed in a rectangular frame shape, and is made of, for example, silicon resin.

  The pedestal portion 7 is a fastening member with the upper surface of the heat radiating portion 8 and is fastened by a screw 3.

  The heat radiating portion 8 is made of, for example, a metal such as aluminum. The heat dissipation unit 8 has a function of releasing the heat from the first LED chip CW, the second LED chip WW, and various electronic components 13 such as resistors to the outside.

  The power supply unit 9 supplies power to the first LED chip CW and the second LED chip WW.

  The base part 10 is a part for attaching to the existing lighting fixture etc., for example, is made by the specification prescribed | regulated to JIS specification.

  The glove portion 11 protects the first LED chip CW and the second LED chip WW, and transmits light from the first LED chip CW and the second LED chip WW to the outside. The glove portion 11 bulges upward in the figure, and is attached to the upper end (attachment end) of the heat dissipation portion 8.

  FIG. 9 is a block diagram showing the configuration of the LED lighting device 1 according to the embodiment of the present invention.

  As shown in FIG. 9, the LED lighting device 1 according to the embodiment of the present invention includes the first LED chip CW and the second LED chip WW as shown in FIG. And an LED drive unit 15 for driving the LED lamp unit 14.

  In the LED lamp unit 14, the plurality of first LED chips CW are connected in series, and both ends thereof are electrically connected to the pair of input terminals 16 respectively. The plurality of second LED chips WW are connected in series, and both ends thereof are electrically connected to the pair of input terminals 16 respectively.

  The LED drive unit 15 supplies power to the input circuit unit 17 for connection to an external power supply, the light adjustment detection unit 18 for detecting the light adjustment ratio of the external power supply, and the LED lamp unit 14 to generate a first LED chip. An LED lighting circuit unit 19 for lighting the CW and second LED chips WW; and a light adjustment control circuit unit 20 for adjusting the power supplied by the LED lighting circuit unit 19 based on the signal from the light adjustment detection unit 18. Have.

  FIG. 10 is a graph showing a change in operating voltage of the first LED chip CW and the second LED chip WW in accordance with a change in dimming ratio in the LED lighting device according to the embodiment of the present invention.

  The number of first LED chips CW is larger than the number of second LED chips WW. For example, the number of first LED chips CW is eight and the number of second LED chips WW is seven.

  Thus, when the first LED chip CW and the second LED chip WW are connected in series, and the first LED chip CW and the second LED chip WW are connected in parallel with one another, There is a difference between the operating voltage of the first LED chip CW and the operating voltage of the second LED chip WW, so that the timing at which the second LED chip WW lights up is earlier, and the timing at which the first LED chip CW lights up is delayed. The timing of turning off the second LED chip WW is late, and the timing of turning off the first LED chip CW is earlier.

  More specifically, as shown in FIG. 10, the second LED chip WW turns off at a dimming ratio of about 5% or less, and the first LED chip CW turns off at a dimming ratio of about 20% or less.

  Conversely, when raising the dimmer from 0%, the second LED chip WW starts to light first at a light control ratio of about 5%, and the first LED chip CW at a light control ratio of about 20% Start lighting up.

  After that, as the dimming ratio increases, the current increases, so the brightness of both decreases. In particular, the brightness of the first LED chip CW is emphasized.

  In the second LED chip WW, a maximum dimming ratio of 100% is supplied to 78 mA, and in the first LED chip CW, a maximum dimming ratio of 100% to 120 mA. As a result, the first LED chip CW, which passes a large amount of current, lights up brighter for the same dimming ratio.

  In addition, the red light from the second LED chip WW starts to appear around about 30% of the light control ratio, and it gradually emphasizes around about 20 to 5%.

  According to the LED lighting device 1 according to the embodiment of the present invention, since the number of first LED chips CW is larger than the number of second LED chips WW, the timing at which the second LED chips WW are lit is The second LED chip WW is reddish like an incandescent lamp earlier than the LED chip 1 of 1 and when the dimming ratio is low.

  In addition, the first LED chip CW and the second LED chip WW are disposed concentrically in plan view, and the first LED chip CW is concentrically located outside and the second LED chip WW is internally located. Because they are arranged offset from each other, when the brightness is reduced with the dimmer, the second LED chip WW lights red from the inside, and when the brightness is increased with the dimmer, the outer first The light of one LED chip CW wraps the light of the inner second LED chip WW. As a result, it is possible to provide an LED illumination device capable of realizing the same color change as an incandescent lamp in light control with a simple configuration without increasing the number of parts.

  In addition, since the light of the first LED chip CW and the light of the second LED chip WW are mixed appropriately, when the light is directed to the inside of the lamp, the light source portion of the internal LED chip is not emphasized. Because it looks blurry, the quality of the lighting device is not degraded.

  In addition, since various components can be arranged without arranging the LED chip in the central portion of the substrate 2, the design can be facilitated and the apparatus can be miniaturized.

  The present invention is not limited to the above embodiment, and various modifications are possible within the scope of the technical matters described in the claims.

  The LED lighting device of the present invention is used to achieve the same color change as incandescent bulbs during light control.

1: LED lighting device 2: substrate 3: screw 4: electric wire for power supply 5: wiring 6: light emitting unit 7: pedestal unit 8: heat radiating unit 9: power supply unit 10: base 11: glove 13: various electronic components 14: LED lamp unit 15: LED drive unit 16: input terminal 17: input circuit unit 18: light adjustment detection unit 19: LED lighting circuit unit 20: light adjustment control circuit unit CW: first LED chip WW: second LED chip R1, R2: parts for resistance

Claims (4)

A substrate,
A first LED chip disposed on the substrate;
A second LED chip disposed on the substrate and having a color temperature lower than that of the first LED chip;
The number of first LED chips is greater than the number of second LED chips,
The first LED chip and the second LED chip are arranged on a substantially concentric circle in plan view at intervals .
Wherein the first LED chip outside, offset from one another the second LED chips from said one concentric such that the inside are arranged adjacent to each other,
The adjacent first LED chip and the second LED chip are arranged to partially overlap
Being
LED lighting device characterized by.   The LED lighting device according to claim 1, wherein the color temperature of the first LED chip is 2600 to 3000 K, and the color temperature of the second LED chip is 1600 to 1800 K.   The LED lighting device according to claim 1 or 2, wherein the LED lighting device is a krypton ball type LED lighting device.   The LED illumination device according to claim 1 or 2, wherein the LED illumination device is a silica sphere type LED illumination device.

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