JP2011119390A - Light-emitting device - Google Patents

Abstract

Provided is an LED light emitting device having a simple configuration that can change color with a small size, light weight, power saving, resource saving, high functionality, and high light emission efficiency while maintaining high color rendition with good color reproducibility. To do.
Light having a spectral intensity distribution different from the light emitted from the short wavelength light LED, using the dimmable short wavelength light LED and the long wavelength light LED as a light emitting element, and using the light of the short wavelength light LED as excitation light. A wavelength conversion member formed in a sheet shape with a wavelength conversion material to be converted into a sheet is disposed on each LED element mounting portion on the cavity, and the sheet-shaped wavelength conversion member is arranged on the cavity by arranging a plurality of types of wavelength conversion regions in parallel. Is configured to be movable in the horizontal direction.
[Selection] Figure 1

Description

  The present invention relates to a light-emitting device with high efficiency of a light-emitting diode that can change light color (correlated color temperature) while maintaining high color rendering.

The use of LEDs (Light-emitting Diodes) for lighting is accelerating the spread of lighting as white LEDs because the three primary colors of light are aligned with the advent of blue LEDs.
LED lighting is characterized by energy saving: power saving is about 1/10 of a light bulb with the same brightness and about 1/2 of a fluorescent lamp. Space-saving: One LED is 5mm in diameter, and the LED light with many LEDs arranged can be made thinner and smaller than those using a light bulb. Long life: The life span of ordinary bulbs is several hundred hours, the LEDs are semi-permanent, saving the need for lamp replacement and saving resources such as glass. Less heat generation: Featuring less heat generation than bulbs and saving cooling costs.

  When the light color is variable in the white range (daylight color, daylight white, white, warm white, light bulb color) defined by Japanese Industrial Standards JIS: Z9112, the conventional LED light emitting device has a plurality of light emission wavelength ranges. In a configuration having various types of LEDs, white light is obtained by dimming (see, for example, Patent Document 1).

  In addition, there is an LED light emitting device that obtains white by using a wavelength conversion material that converts single-type LED emitting short wavelength light and short wavelength light source light into light having different spectral intensity distributions as excitation light (for example, , See Patent Document 2).

JP 2007-200723 (page 2-3, FIG. 1) Japanese Patent Laying-Open No. 2005-244076 (page 5-7, FIG. 1)

  In Patent Document 1, which is such a conventional LED light emitting device, the forward voltages of a plurality of types of LEDs are different from each other. Therefore, it is necessary to perform LED light output control in accordance with each forward voltage characteristic at the time of dimming. However, there is a problem that the cost becomes high.

  In addition, the LED light emitting device of Patent Document 2 can provide different light colors with a simple configuration. However, in the conventional blue LED + phosphor system, red color reproduction due to shortage of long wavelength components, or poor color rendering properties. There is a problem. If the number of phosphor layers is increased in order to provide color variations as in Patent Document 2, the light emission efficiency is lowered. Further, in order to emit various light colors, it is necessary to change the phosphor layer, and it is inconvenient to peel off and replace the phosphor sheet layer from the LED package opening.

  The present invention has been made to solve the above-described problems, and is small and light weight, power saving, resource saving, high functionality, and high luminous efficiency while maintaining good color reproducibility and color reproducibility. An LED light emitting device having a simple configuration capable of changing the color is obtained.

  The light-emitting device according to the present invention is different from the light emitted from the short-wavelength light LED, with the light-controllable short-wavelength light LED and long-wavelength light LED as light-emitting elements. A wavelength conversion member in which a wavelength conversion material to be converted into light having a spectral intensity distribution is formed in a sheet shape is disposed on a cavity that is an LED element mounting portion, and the sheet-shaped wavelength conversion member has a plurality of types of wavelength conversion regions arranged in parallel. These are arranged in parallel to move horizontally on the cavity.

  According to the present invention, the configuration of the red LED + blue LED + wavelength conversion member having a long wavelength component can change the color while maintaining high color reproducibility with high red color reproducibility.

It is a typical perspective view of the light-emitting device which shows Embodiment 1 of this invention. (A) It is AA sectional drawing of FIG. 1 of the light-emitting device which shows Embodiment 1 of this invention. (B) It is BB sectional drawing of FIG. 1 of the light-emitting device which shows Embodiment 1 of this invention. It is a block diagram explaining the electrical structure of the light-emitting device which shows Embodiment 1 of this invention. It is a spectral distribution figure of the 1st wavelength conversion area | region of the light-emitting device which shows Embodiment 1 of this invention. It is a spectral distribution figure of the 2nd wavelength conversion area | region of the light-emitting device which shows Embodiment 1 of this invention. (A) It is a schematic perspective view of the light-emitting device which shows Embodiment 2 of this invention. (B) It is a schematic perspective view of the light-emitting device which shows Embodiment 2 of this invention. (A) It is arrangement | positioning explanatory drawing of the LED element of the light-emitting device which shows Embodiment 2 of this invention. (B) It is arrangement | positioning explanatory drawing of the LED element of the light-emitting device which shows Embodiment 2 of this invention. (A) It is a typical perspective view of the light-emitting device which shows Embodiment 3 of this invention. (B) It is CC sectional drawing of Fig.8 (a) of the light-emitting device which shows Embodiment 3 of this invention. It is a typical perspective view of the light-emitting device which shows Embodiment 4 of this invention. It is a block diagram explaining the electrical structure of the light-emitting device which shows Embodiment 5 of this invention. It is typical sectional drawing of the light-emitting device which shows Embodiment 6 of this invention.

Embodiment 1 FIG.
1 to 3 show a light-emitting device according to Embodiment 1 for carrying out the present invention. FIG. 1 is a schematic perspective view of the light-emitting device according to Embodiment 1, and FIG. 2 is (a) FIG. FIG. 3B is a block diagram for explaining the electrical configuration of the light-emitting device according to the first embodiment. In the figure, an LED package 1 which is a light emitting device is formed of ceramic, metal, resin, etc., and includes an LED element mounting portion 2 (a cavity referred to in the claims) formed of a concave portion having an opening 2a on its upper surface. The inner side is formed of silver or the like having a high reflectance with respect to visible light, and the blue LED element 3 and the red LED element 4 are provided. The blue LED element 3 and the red LED element 4 are mounted in the LED element mounting portion 2 with a wire, and light-transmitting sealing resin 5 such as epoxy or silicone is provided in the concave portion of the LED element mounting portion 2. Meet and seal.

The wavelength conversion member 6 is disposed above the concave portion of the LED element mounting portion 2 sealed with the sealing resin 5 so as to face the light from the blue LED element 3 and the red LED element 4. The wavelength conversion member 6 is formed in a sheet shape, and is disposed so that the sheet surface faces the light from the blue LED element 3 and the red LED element 4.
For example, the sheet-like wavelength conversion member 6 is prepared by mixing a predetermined amount of a silicone resin and a silicone-based phosphor and pouring the mixture into a sheet mold. It is made by curing. In this way, after the first wavelength conversion region 6a and the second wavelength conversion region 6b are formed as separate members in a sheet shape, they are arranged so as to be arranged above the opening 2a of the LED package mounting portion 2, respectively. The Then, the wavelength conversion member 6 configured as described above is slid in the C direction of FIGS. 1 and 2 by the movable portion 7.
In addition, although the 1st wavelength conversion area 6a and the 2nd wavelength conversion area 6b are created in the sheet shape as a separate member, the 1st wavelength conversion area 6a and the 2nd wavelength conversion area 6b are one sheet. It is good also as a structure formed on this sheet | seat.

  Next, details of the wavelength conversion member 6 will be described. The sheet-like wavelength conversion member 6 produced as described above is formed by connecting a plurality of types of wavelength conversion regions that emit light having different spectral wavelengths in a sheet form. In the first embodiment, the first wavelength conversion region 6a and the second wavelength conversion region 6b are excited by light having a light emission wavelength (350 to 470 nm) in the near ultraviolet to blue region of the blue LED element. It is configured to emit light having different spectral wavelengths. As the wavelength conversion material, for example, a europium-activated silicate green to yellow phosphor that is excited by a light emission wavelength in the near ultraviolet to blue region is used. The wavelength conversion material is not limited to this, and even YAG phosphors and sialon phosphors are similarly excited by the emission wavelength in the near ultraviolet to blue region.

And in order to position either the 1st wavelength conversion area | region 6a or the 2nd wavelength conversion area | region 6b of the sheet-like wavelength conversion member 6 mentioned above on the upper surface of the opening part 2a of the LED element mounting part 2, it is movable. The wavelength conversion member 6 is slid in the direction A in FIG.
The drive current values of the blue LED element 3 and the red LED element 4 and the operation of the movable unit 7 are controlled by the control unit 8 as shown in the block diagram of FIG. 3, and the blue LED element 3 and the red LED The element 4 is formed with a conductive pattern that can be controlled independently, and the insulating surface is formed of silver or the like having a high reflectance with respect to visible light so as to increase the luminous efficiency of the light emitting device.

Next, the operation of the LED package 1 which is the light emitting device configured as described above will be described. First, a case where a daylight color is emitted will be described. As the daylight color, a daylight color (color temperature of about 6500 K) can be obtained by the combined light of blue LED light, red LED light, and wavelength converted light.
First, the movable portion 7 is controlled so that the first wavelength conversion region 6 a of the wavelength conversion member 6 is positioned on the upper surface of the concave portion of the LED package mounting portion 2. Then, light is emitted from the blue LED element 3 and the red LED element 4 mounted in the LED package mounting part 2 to the first wavelength conversion region 6 a disposed on the upper surface of the concave portion of the LED package mounting part 2. The emitted light is incident on the first wavelength conversion region 6a, and a part of the incident light of the blue LED element 3 is two kinds of silicate phosphors (two) included in the first wavelength conversion region 6a. The light is subjected to a wavelength conversion action by a seed wavelength conversion material), and is emitted from the first wavelength conversion region 6a to the outside of the LED package mounting portion 2 as light having a different spectral intensity distribution (spectrum). At the same time, part of the light of the blue LED element 3 is not subjected to the wavelength conversion action by the silicate phosphor, and is transmitted through the first wavelength conversion region 6a as it is and emitted outside the LED package mounting portion 2. In addition, the light from the red LED element 4 is transmitted as it is without receiving the wavelength conversion action of the first wavelength conversion region 6a.

  Thus, the light from the blue LED element 3 that has undergone the wavelength conversion action of the first wavelength conversion region 6a and the light of the blue LED element 3 and the red LED element 4 that have passed through without undergoing the wavelength conversion action. The combined light emits light having a spectral distribution diagram (average color rendering evaluation index Ra = 86, special color rendering evaluation index R9 (value indicating red color reproducibility) = 97) as shown in FIG. It is possible to obtain daylight-colored light having a high color rendering index R9 for red, which is not good for conventional white LEDs such as phosphors.

Next, a description will be given of the case of obtaining a warm light bulb color (color temperature of about 2800 K) that is common as lighting for a place to eat.
The second wavelength conversion region 6 b of the wavelength conversion member 6 is positioned on the upper surface of the concave portion of the LED package mounting portion 2 by sliding the wavelength conversion member 6 by the movable portion 7. Then, light is emitted from the blue LED element 3 and the red LED element 4 mounted in the LED package mounting unit 2 to the second wavelength conversion region 6 b disposed on the upper surface of the concave portion of the LED package mounting unit 2. The emitted light is incident on the second wavelength conversion region 6b.
Of the light incident on the second wavelength conversion region 6b, the light of the blue LED element 3 has a wavelength conversion action by the silicate phosphor (wavelength conversion material) part of which is included in the second wavelength conversion region 6b. As a result, light having a different spectral intensity distribution (spectrum) is emitted from the second wavelength conversion region 6b. The remaining part of the light incident on the second wavelength conversion region 6b is transmitted through the second wavelength conversion region 6b without being subjected to the wavelength conversion action by the silicate phosphor, and is out of the LED package mounting portion 2. To be emitted. The light from the red LED element 4 is transmitted as it is without being subjected to the wavelength conversion action of the second wavelength conversion region 6b.

  As a result, light from the second wavelength conversion region 6b has a spectral distribution diagram (average color rendering evaluation index Ra = 90, special color rendering evaluation index R9 (value indicating red color reproducibility) = 98) as shown in FIG. Is emitted. As described above, it is possible to obtain light bulb color light having a high light emission characteristic Ra of 80 or more and a very high color rendering index R9 for red, which the conventional white LED is not good at.

  As described above, the sheet-like wavelength conversion member 6 having a plurality of types of wavelength conversion regions is slid over the blue LED element 3 and the red LED element 4 so that the correlated color temperature (color) can be easily obtained with one light emitting device. In a room where you can study, such as a child's room, you can change the daylight color of a refreshing light that is close to noon on sunny days, and a calm and warm light bulb color (incandescent light bulb (average It is possible to select various color shades according to the scene to be used, such as selecting the color rendering index Ra = 100), and to obtain a highly efficient LED package light emitting device with high color rendering properties.

  In addition, by changing the blending ratio of the phosphors in the wavelength conversion member 6 in the wavelength conversion region and adjusting the amount of the phosphors according to the purpose of use, various white shades ranging from “daylight color” to “bulb color” It is also possible to realize LEDs with various colors, ranging from bluish cold white to reddish warm white, depending on the composition, and with the same chromaticity It is also possible to realize a white LED with higher color rendering.

  Moreover, in the said embodiment, although the case where the wavelength conversion area | region of the wavelength conversion member 6 is two types is shown, it is not restricted to this, As shown in FIG. The region 6c, the fourth wavelength conversion region 6d, and the like may be arranged in parallel in the horizontal direction so as to slide over the blue LED element 3 and the red LED element 4, and the third and fourth wavelength conversion regions By providing various types of wavelength conversion regions according to the purpose of use by changing the blending ratio of phosphors, the amount of phosphors, and the like, it is possible to provide a light emitting device of an LED package adapted to various scenes it can.

Embodiment 2. FIG.
In the first embodiment, the number and arrangement of the blue LED elements 3 and red LED elements 4 that are excitation light are not particularly mentioned, but the blue LED elements 3 and red LED elements 4 of the LED package 1 are shown in FIG. As shown in FIG. 7, commercially available surface mount LEDs (see FIG. 7 (a), blue surface mount LED 3a, red surface mount LED 4a) and shell type package LEDs (see FIG. 7 (b), blue shell type LED 3b, red shell type) LED 4b) may be used, and blue LED elements 3 and red LED elements 4 may be arranged in a plurality (for example, two) sets, and the package shape is not limited to square, but may be rectangular or linear. Further, when a plurality of blue LED elements 3 and red LED elements 4 are provided, if the numbers are equal, the blue LED elements 3 and the red LED elements 4 are connected in a staggered pattern as shown in FIG. The color mixing property can be improved by arranging in a shape. By increasing the color mixing property, the color rendering property increases. Further, in order to improve the color mixing property when a plurality of blue LEDs 3 and red LEDs 4 are provided, the arrangement is not limited to a staggered pattern, and the blue LED elements 3 and the red LEDs may vary depending on the size even if the number varies. The color mixing property with the element 4 may be maintained (see FIG. 8B).

Embodiment 3 FIG.
FIG. 9 shows a light-emitting device according to Embodiment 3 for carrying out the present invention. (A) A schematic perspective view of the light-emitting device (b) is a cross-sectional view taken along DD in FIG. 9 (a). In the figure, the same parts as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted.
In the first embodiment, the wavelength conversion member 6 is moved as a method of moving the first wavelength conversion region 6a and the second wavelength conversion region 6b side by side on the same plane. As a method of continuously sliding the conversion region, the first wavelength conversion region 6a and the second wavelength conversion region 6b are arranged in a band shape to form a ring shape, and LED elements are mounted using the two rotation shafts 9 as rotation means. It is good also as a structure which moves on the opening part 2a of the part 2. FIG.

This is because, for example, a downlight or the like is embedded in the ceiling so that a space for installation in the ceiling is necessary, and the width to be embedded is preferably shallow. Therefore, in order to make the vertical dimension (depth direction) of the light emitting device as short as possible (shallow), the LED package 1 is surrounded by a ring-shaped wavelength conversion member 6 as shown in FIG. 9B. Thus, a thin downlight can be realized without increasing the size of the light emitting device.
By adopting such a structure, the wavelength conversion member 6 can be slid without taking a place, and the correlated color temperature (color temperature) of light can be appropriately changed without increasing the size of the apparatus itself. Downlights with various colors can be obtained.

Embodiment 4 FIG.
FIG. 10 is an enlarged perspective view of a main part of the light emitting device in the fourth embodiment for carrying out the invention. In the figure, the same parts as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted.
The wavelength conversion member 6 has the first wavelength conversion region 6a and the second wavelength conversion region 6b arranged in the circumferential direction on the same plane, and the wavelength conversion member 6 is formed into a flat plate-like disk shape. Is done. Then, the wavelength conversion member 6 formed in a disc shape can be switched between the first wavelength conversion region 6a and the second wavelength conversion region 6b along the circumferential orbit by rotational driving. With this configuration, for example, if the rotational operation direction of the knob and the rotational drive direction of the wavelength conversion member 6 are linked, the wavelength conversion region of the light emitting device 1 can be easily moved manually.

  In the fourth embodiment, there are two types of wavelength conversion regions. However, when two or more types of wavelength conversion regions are provided, the wavelength conversion member 6 is formed so that at least different wavelength conversion regions face each other. By doing so, the same effect can be obtained.

Embodiment 5 FIG.
In addition, as shown in FIG. 11, by providing the illuminance sensor 11, the light color can be automatically changed according to the brightness of the place where the light emitting device 1 is installed.
The illuminance sensor 11 detects ambient illuminance, and the wavelength conversion member 6 is moved by the movable unit 7 by the control unit 8 according to the detection result, so that various colors ranging from “daylight color” and “bulb color” can be given.
Also, a timer for counting the date and time may be provided so that the light color (correlated color temperature) is automatically changed according to the season and time. In addition, by setting the light emission time by the user, the light color can be automatically changed at the set time. Further, the command to the control unit 8 may be configured to be operated by a user using, for example, a switch or button operation unit.

  Since the LED element can be dimmed, the illuminance can be changed with a certain light color.

  In addition, since the sheet-like wavelength conversion member having a plurality of types of wavelength conversion regions can be automatically moved, it can be easily used for general production lighting equipment, decorative lighting, and the like.

  DESCRIPTION OF SYMBOLS 1 LED package, 2 LED element mounting part, 2a Opening part, 3 Blue LED element, 4 Red LED element, 5 Sealing resin, 6 Wavelength conversion member, 6a 1st wavelength conversion area, 6b 2nd wavelength conversion area, 7 Movable part, 8 Control part, 9 Rotating shaft, 3a Blue surface mounted LED, 4a Red surface mounted LED, 3b Blue bullet type LED, 4b Red bullet type LED.

Claims (10)

Each light-controllable short wavelength light LED and long wavelength light LED is used as a light emitting element,
Each LED element mounting portion includes a wavelength conversion member in which a wavelength conversion material that converts light of the short wavelength light LED into excitation light and converts it into light having a spectral intensity distribution different from the light emitted by the short wavelength light LED is formed into a sheet shape. Placed on a cavity that is
The sheet-like wavelength conversion member has a plurality of types of wavelength conversion regions arranged in parallel, and is movable in the horizontal direction on the cavity.   2. The light emitting device according to claim 1, wherein the wavelength conversion member is formed to have a wavelength conversion region that realizes at least two kinds of light among daylight color, day white color, white color, warm white color, and light bulb color. .   3. The light emitting device according to claim 1, wherein the wavelength conversion region of the wavelength conversion member is formed of one type or two types of different wavelength conversion materials.   The light emitting device according to claim 1, wherein the wavelength conversion member is made of at least two different wavelength conversion materials.   The wavelength conversion member is formed in a wide ring shape, and includes a rotational drive that rotates the ring-shaped wavelength conversion member so that any one of the plurality of types of wavelength conversion regions is disposed on the cavity. The light emitting device according to claim 4.   A plurality of wavelength conversion regions of the wavelength conversion member are arranged on the same surface so as to face each other, and include a rotational drive that rotates the wavelength conversion member in a circumferential direction, The light emitting device according to claim 4, wherein any one of the light emitting devices is disposed on the cavity.   An illuminance sensor that detects the illuminance around the light emitting device is provided, and a control unit that automatically performs color adjustment by moving or rotating the wavelength conversion member according to the amount of illuminance detected by the illuminance sensor is provided. The light-emitting device according to claim 1.   The timer according to claim 1, wherein a timer for counting the date and time is provided, and control means for automatically performing color matching by moving or rotating the wavelength conversion member according to the season and time is provided. Light emitting device.   The light emitting device according to claim 1, wherein the light emitting element is an LED chip.   The light-emitting device according to claim 1, wherein the light-emitting element is a surface-mounted LED or a bullet-type LED.

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