JP2009054989A - Light-emitting apparatus, illuminating apparatus, and clean room having the illuminating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein an illuminance is reduced to one-third or one-fourth compared with the case of illumination without using a filter, since a conventional illuminating apparatus, such as a fluorescent body or a mercury lamp or the like, has a filter for cutting a specific wavelength, cuts the specific wavelength using the filter to illuminate, and results in making lighting in a clean room dark yellow light-emitting, which impairs the security of workers in the room, and also is psychologically-stressful for the workers. <P>SOLUTION: A light-emitting apparatus has a semiconductor light-emitting element, a fluorescent material to be excited by light from the semiconductor light-emitting element, and a sealing resin which has the fluorescent material and covers the semiconductor light-emitting element. In the light-emitting apparatus, a specific wavelength component is suppressed so that a photosensitive material which reacts to a specific wavelength does not react due to the fluorescent material contained in the sealing resin. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light-emitting device using a light-emitting diode (hereinafter referred to as LED), a lighting device including the light-emitting device, and a clean room including the lighting device.

  A part of a manufacturing process of an electronic device such as a semiconductor integrated circuit (IC) or a liquid crystal display device is usually performed in a clean room. In a clean room, clean air is blown out through a HEPA (high function) filter provided on the ceiling surface, and the blown air is sucked from the floor surface by carrying dust in the room by an air flow. And the indoor air is kept clean by the circulation that the air from which dust was removed by the HEPA filter is blown out from the ceiling again.

  Further, in a process using a photosensitive resin such as a photoresist such as a photolithography process when forming a circuit pattern of an IC performed in a clean room or a TFT circuit of a liquid crystal display device, exposure work by the exposure apparatus is not affected. In addition, it is necessary to cut a specific wavelength of light emitted from a lighting device provided in the room.

  That is, a photosensitive resin such as a photoresist changes to become alkali-soluble or hardens in response to light of a specific wavelength such as i-line (365 nm) or g-line (436 nm) irradiated from an exposure apparatus. However, if it reacts with light from an illuminating device other than the exposure device, precise circuit formation cannot be performed. Accordingly, in a place where a process using a photosensitive resin such as a clean room is performed, it is necessary to illuminate the room by cutting the wavelength at which the photosensitive resin reacts.

Therefore, in a conventional clean room, an illumination device such as a fluorescent lamp or a mercury lamp having a filter for cutting off a specific wavelength has been used. As an example, Patent Document 1 below includes a light cut filter that is formed by dispersing and adding silver fine particles as a main component and cutting transmittance by 50% within a wavelength range of 450 nm to 500 nm. A high-pressure mercury (HID) lamp with a tube is disclosed.
JP 2005-221750 A

However, the conventional illumination device such as a phosphor or a mercury lamp having a filter that cuts off a specific wavelength cuts and illuminates light of a specific wavelength using the filter. Compared to, the illuminance decreased from 1/3 to 1/4, and the illumination in the clean room was dark yellow light emission. Therefore, the safety of the person working indoors was impaired, and it was also a mental stress for the worker.
In view of such problems, the object of the present invention is to use an LED as a light source, and in particular, in a light emitting device composed of a phosphor that is excited by light from the LED and the LED, a specific wavelength at which a photosensitive resin or the like reacts. It is providing the light-emitting device which suppressed the component, the illuminating device using the said light-emitting device, and the clean room using the said illuminating device.

The light-emitting device of the present invention is a light-emitting device comprising a semiconductor light-emitting element and a phosphor excited by light from the semiconductor light-emitting element, and includes a suppressor that suppresses a specific wavelength component to which a photosensitive substance reacts. It is characterized by.
According to the present invention, it is possible to perform illumination while suppressing a specific wavelength component to which a photosensitive resin or the like reacts and suppressing a decrease in illuminance.

A light emitting device of the present invention includes a semiconductor light emitting element, a phosphor excited by light from the semiconductor light emitting element, and a sealing resin that includes the phosphor and covers the semiconductor light emitting element. A specific wavelength component is suppressed so that a photosensitive substance that reacts to a specific wavelength does not react with the phosphor.
According to the present invention, it is possible to perform illumination while suppressing a specific wavelength component to which a photosensitive resin or the like reacts and suppressing a decrease in illuminance.

The light emitting device of the present invention is further characterized in that the wavelength region to which the photosensitive substance reacts is a blue region such as g-line.
ADVANTAGE OF THE INVENTION According to this invention, while suppressing that the photosensitive resin etc. which react to the wavelength of blue area | regions, such as g line | wire, are exposed, the illumination which suppressed the fall of illumination intensity is possible.

The light emitting device of the present invention is further characterized in that the amount of the phosphor is larger than the amount of the phosphor included in the sealing resin when the light emitting device emits white light.
According to the present invention, by increasing the amount of the phosphor, it is possible to perform illumination while suppressing a specific wavelength component to which a photosensitive resin or the like reacts and suppressing a decrease in illuminance.

The light emitting device of the present invention is further characterized in that the semiconductor light emitting element is a light emitting diode.
According to the present invention, since it does not include the ultraviolet region, it is possible to perform illumination with a reduction in illuminance while suppressing the photosensitive resin or the like from being exposed without emitting light having an i-line wavelength.

The light emitting device of the present invention is further characterized in that the light emitting diode is a blue LED and the phosphor is a yellow phosphor.
According to the present invention, it is possible to emit a light yellow lemon light that suppresses the photosensitive resin or the like from being exposed to light.

The light emitting device according to the present invention is further characterized in that the light emitted from the light emitting device is included in a range of X color coordinates of 0.4 to 0.45 in the chromaticity table.
According to the present invention, bright yellow (lemon) light emission is possible. Further, in the case where a lighting device having the light emitting device of the present invention such as a clean room is provided, the interior is kept bright, and the effect of ensuring the safety of the worker or not giving the worker stress can be obtained.

The light-emitting device of the present invention is further characterized in that the sealing resin contains a red phosphor.
According to the present invention, a light emitting device with higher color rendering properties can be obtained.

The illuminating device of this invention is an illuminating device provided with either of the said light-emitting devices.
According to the present invention, it is possible to perform illumination while suppressing a specific wavelength component to which a photosensitive resin or the like reacts and suppressing a decrease in illuminance.

The illuminating device of the present invention is further characterized by comprising a blocking means for blocking light of a specific wavelength component.
According to the present invention, since light of a specific wavelength component can be blocked by the blocking means in addition to the suppressor, it is possible to more reliably reduce the light of the specific wavelength component.

The illumination device according to the present invention is further characterized in that the blocking means includes a filter and a diffusion plate that block light of a specific wavelength component.
According to the present invention, it is possible to reduce glare of a light source by reducing light of a specific wavelength component with a filter and scattering light with a diffusion plate.

The illumination device of the present invention is further characterized in that the blocking means has an air layer between the filter and the diffusion plate.
According to the present invention, it is possible to suppress light loss in the filter of the blocking means and to extend the life of the filter.

The clean room of this invention is a clean room provided with the said illuminating device.
According to the present invention, it is possible to suppress the reaction of a photosensitive substance used in a clean room, to ensure the safety of a person working in the room, and to suppress the mental stress of the worker. .

  According to the present invention, it is possible to perform illumination while suppressing a specific wavelength component to which a photosensitive resin or the like reacts and suppressing a decrease in illuminance.

Hereinafter, a light emitting device (light source module) using the LED of the present invention, an LED lighting device including the light emitting device, and a clean room including the LED lighting device will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a schematic plan view of a light emitting device according to Embodiment 1 of the present invention. FIG. 2 is a schematic configuration diagram in which the sealing resin of Embodiment 1 of the light emitting device of the present invention is removed. FIG. 3 is a schematic cross-sectional view of the main part of Embodiment 1 of the light-emitting device of the present invention.

Embodiment 1 of the light emitting device of the present invention will be described with reference to FIGS.
Referring to FIGS. 1 and 2, a light emitting device 10 is made of ceramic such as aluminum oxide (alumina), for example, and a plurality of blue LEDs 12 are arranged in parallel on a rectangular substrate 11 having rounded corners. Has been implemented. The group of mounted LEDs 12 is covered and sealed with a sealing resin layer 15 made of a sealing resin 14 such as an epoxy resin including a yellow phosphor 13 that is excited by light from the LEDs 12 and emits yellow light. The light emitting unit 16 is configured by the plurality of blue LEDs 12 and the sealing resin layer 15 including the yellow phosphor 13 and the sealing resin 14.
A wiring pattern 17 is formed in parallel on the substrate 11 by a photoetching method or the like, and a plurality of LEDs 12 are made of resin such as epoxy resin corresponding to the LED mounting guide mark 18 formed along the wiring pattern 17. Fixed using.

  Furthermore, a set of screw mounting portions 19 for locking the substrate 11 to a base body (not shown) such as a lighting device and two external power sources (not shown) at two opposite corners of the rectangular substrate 11. A pair of external connection land portions 20 and a negative electrode external connection land 21 for supplying a direct current to the LED 12 is provided. External wiring 22 is connected to the positive electrode external connection land 20 and the negative electrode external connection land 21, and external wiring cutout holes 23 through which the external wiring 22 passes are provided on two opposing sides of the substrate 11.

Referring to FIG. 3, the plurality of LEDs 12 are electrically connected to the wiring pattern 17 with wires W, and an alloy such as Ag—Nd that reflects light transmitted from the LEDs 12 to the inside of the substrate 11 inside the substrate 11. The reflective layer 24 made of is formed using a sputtering method. The thickness of the substrate 11 is about 1 mm, and the thickness of the reflective layer 24 is about 0.1 mm. If the thickness of the reflective layer 24 is about 0.1 mm, the effect as the reflective layer can be obtained more reliably.
Next, the blue LED 12, the yellow phosphor 13 and the sealing resin 14 constituting the light emitting unit 16 will be described in detail.

In the present embodiment, a blue LED in which a gallium nitride compound semiconductor is formed on a sapphire substrate is used as the blue LED 12, and the BOS phosphor (BaSr) 2 SiO 4 is used as a material of the yellow phosphor 13 that emits yellow light when excited by blue light: Eu2 + is used.
However, as the blue LED 12, a blue LED in which a gallium nitride compound semiconductor is formed on a GaN substrate or a blue LED made of a ZnO (zinc oxide) compound semiconductor may be used. It goes without saying that InGaAlP-based and AlGaAs-based compound semiconductor LEDs may be used.
Further, Ce: YAG (cerium activated yttrium / aluminum / garnet) phosphor may be used as a material of the yellow phosphor 13 that is excited by blue light and emits yellow light.

  As the material of the sealing resin 14, in addition to the epoxy resin, a transparent resin having excellent weather resistance such as urea resin and silicone resin, and a light-transmitting inorganic material such as silica sol and glass having excellent light resistance are suitably used. . Moreover, you may contain a diffusing agent with fluorescent substance in sealing resin. As specific diffusing agents, barium titanate, titanium oxide, aluminum oxide, silicon oxide, calcium carbonate, silicon dioxide and the like are preferably used.

  Next, when the amount of the yellow phosphor 13 in the sealing resin layer 15 is changed, the coordinate position in the CIE chromaticity table of the light emitted from the light emitting unit 16, the change in the spectral distribution, the total luminous flux Based on an experimental result, the dependence with respect to the quantity of the yellow fluorescent substance 13 of the light from the light emission part 16 is demonstrated.

FIG. 4 is a diagram showing a change (movement) of the coordinate position in the chromaticity table of light emitted from the light emitting unit 16 when the amount of the yellow phosphor 13 in the sealing resin layer 15 is changed. .
The ◯ points in the table indicate the coordinate positions when only the blue LED 12 emits light, and a plurality of ◇ points indicate the light from the blue LED 12 and the yellow phosphor 13 in the sample in which the amount of the yellow phosphor 13 is changed. Indicates the coordinate position of the combined light.

  As the amount of the yellow phosphor 13 in the sealing resin layer 15 increases, the probability that the light emitted from the blue LED 12 collides with the yellow phosphor 13 increases, so that the yellow phosphor 13 is excited to emit yellow light. And the intensity of blue light emission tends to decrease because the yellow phosphor 13 blocks the light emission. Accordingly, the yellow phosphor functions as a light suppressor for the blue region from the blue LED, and the coordinate position of the light emitted from the light emitting unit 16 moves from the blue region to the yellow region in the chromaticity table of FIG. (Moves in the direction of the arrow).

FIG. 5 is a graph showing changes in the spectral distribution of the light emitted from the light emitting unit 16 (the combined light of the light from the blue LED 12 and the yellow phosphor 13).
A plurality of spectral distributions in the graph indicate spectral distributions of representative samples selected from the samples shown in FIG. 4, and each spectral distribution is represented by the value of color coordinate X (X axis) in the chromaticity table of FIG. It is named. Therefore, as the value of the color coordinate X increases, the combined light moves from the blue region to the yellow region in the chromaticity table. Of the two peak wavelengths in the graph, about 440 nm indicates the wavelength of blue emission by the blue LED, and about 570 nm indicates the wavelength of yellow emission of the yellow phosphor 13.

  From the graph of FIG. 5, as the value of the color coordinate X increases (the amount of yellow phosphor increases), the intensity of light of the blue emission wavelength (about 440 nm) decreases and the amount of yellow phosphor is the largest (X The intensity of blue light emission is minimized when the color coordinates are 0.4294). This is because, as described above, as the amount of yellow phosphor increases, the probability that light from the blue LED 12 collides with the yellow phosphor 13 increases, and the blue light transmitted through the sealing resin layer 15 decreases. is there. Also, from the graph, when the value of the color coordinate X is greater than about 0.4, the intensity of blue light emission is such that the photosensitive resin sensitive to g-line (436 nm) does not react, and the yellow fluorescence as a suppressor. It can be seen that the body 13 is sufficiently suppressed.

  Further, as the amount of yellow phosphor increases, the intensity of light having a wavelength of yellow light emission (about 570 nm) increases, and becomes maximum when the color coordinate X is 0.4120. In addition, the sample having the largest amount of yellow phosphor with the color coordinate X of 0.4294 has a lower intensity of yellow light emission than the sample with the color coordinate X of 0.4120. This is because when the yellow phosphor 13 in the sealing resin layer 15 exceeds a certain amount, yellow light emitted from the yellow phosphor 13 when excited by the blue light of the blue LED 12 is more external to the sealing resin layer. This is because the probability of being blocked by another yellow phosphor 13 close to is increased.

FIG. 6 is a graph showing a change in the total luminous flux of the light emitted from the light emitting unit 16 when the amount of the yellow phosphor 13 included in the sealing resin layer 15 is changed. The total luminous flux means the total amount of light emitted from the light emitting unit 16 and corresponds to the total amount of combined light of the light emitted from the plurality of blue LEDs 12 and the yellow phosphor 13.
The horizontal axis of the graph of FIG. 6 indicates the color coordinate X, and the vertical axis indicates the total luminous flux (lm: lumen). As the value of the color coordinate X on the horizontal axis increases, the amount of yellow phosphor 13 included in the sealing resin layer 15 increases. The sample points in the graph correspond to samples (含 む points) containing different yellow phosphor amounts in FIG.

  From the graph of FIG. 6, the total luminous flux tends to increase as the color coordinate X increases (the amount of yellow phosphor increases), but the total luminous flux becomes the maximum in the sample because the value of the color coordinate X is This is not the case of the maximum (the most yellow phosphor amount) of 0.4294, but the case where the color coordinate X is 0.4120. This is because when the amount of the yellow phosphor 13 in the sealing resin layer 15 exceeds a certain amount, the blue light emission of the blue LED 12 and the yellow light emission from the yellow phosphor 13 are different from each other in the sealing resin layer 15. This is because the probability of being blocked by the phosphor 13 is increased.

  Therefore, there is an optimum amount of yellow phosphor for maximizing the total luminous flux of the light from the light emitting unit 16, and the yellow phosphor 13 is sealed so that the value of the color coordinate X is about 0.4 from the experimental results. It is preferable to be included in the resin layer 15. Since the value of the total luminous flux is sufficiently large when the value of the color coordinate X is in the range of 0.35 to 0.45, the sealing resin is used so that the value of the color coordinate X is in the range of 0.35 to 0.45. The amount of yellow phosphor 13 contained in the layer 15 is preferably adjusted.

  Based on the above experimental results, the amount of the yellow phosphor 13 contained in the sealing resin layer 15 is specified by adjusting the value of the X color coordinate of the light from the light emitting unit 16 to be about 0.4. It is possible to prevent the photosensitive resin sensitive to the wavelength (for example, g-line) from reacting and to emit light with a large total luminous flux. Furthermore, from the chromaticity table of FIG. 4, when the value of the X color coordinate is adjusted to a value of about 0.4, the Y color coordinate is about 0.5, and the yellow fluorescent lamp used in the conventional clean room Bright yellow (lemon) light emission different from dark yellow is possible.

  Therefore, the interior of a room equipped with a lighting device such as a clean room is kept bright, and an effect of ensuring the safety of the worker or not giving stress to the worker can be obtained. This effect can be obtained even when the value of the X color coordinate is about 0.4 to 0.45.

FIG. 7 is a graph showing the relationship between the weight ratio of the sealing resin and the yellow phosphor 13 contained in the sealing resin layer and the color coordinates of the light emitted from the light emitting unit 16.
As shown in the graph, as the value of the weight ratio of yellow phosphor / encapsulating resin increases (the amount of yellow phosphor contained in the encapsulating resin layer increases), the values of color coordinate X and color coordinate Y increase. Become. Therefore, there is a correlation between the amount of yellow phosphor contained in the encapsulating resin layer and the color coordinate of the emitted light, and the color coordinate X and color coordinate Y are used to control the weight ratio of the yellow phosphor / encapsulating resin. Can be adjusted.

  For example, as described above, in order to obtain a light emitting device that can prevent a photosensitive resin sensitive to a specific wavelength (for example, g-line) from reacting and can emit light with a large total luminous flux, In order to adjust the color coordinate X of the emitted light to an optimum value such as about 0.4, it is possible to adjust the weight ratio of the yellow phosphor / sealing resin to 0.6.

A photosensitive resin such as a photoresist used in a manufacturing process of a semiconductor integrated circuit or the like reacts with a wavelength in an ultraviolet region of i-line (365 nm), a wavelength in a blue region such as g-line (436 nm), or is alkali-soluble or cured. The physical properties of
Since the light emitting device 10 of the present embodiment uses the blue LED 12 as a light source, a wavelength in the ultraviolet region generated by a mercury lamp or the like is not generated, and a yellow phosphor is used as a phosphor contained in the sealing resin layer 15. 13 is included, and the wavelength corresponding to the blue region can be suppressed so that the photosensitive resin does not react.

In addition, the configuration in which the yellow phosphor is included as the phosphor included in the sealing resin layer 15 is illustrated, but the phosphor included in the sealing resin layer in order to suppress the light from the blue LED 12 is a yellow phosphor. The same effect can be obtained even if the light emitted from the phosphor includes a red phosphor or a green phosphor that does not include a blue region.
In particular, by appropriately adjusting the sealing resin layer by mixing a red phosphor in addition to a yellow phosphor, light having a higher color rendering property can be emitted while suppressing light having a wavelength in the blue region. Sr2Si5N8: Eu or CaAlSiN3: Eu2 + can be suitably applied as the red phosphor that emits red light when excited by the blue phosphor.

  Further, a green phosphor may be included in the sealing resin in addition to the above example. A variety of light emission is possible while suppressing light having a wavelength in the blue region. As green phosphors that emit green light when excited by a blue phosphor, α sialon (α-SiAlON: Ce3 +), β sialon (β-SiAlON: Eu2 +), Sr aluminate (SrAl2O4: Eu2 +), (Sr, Ba) 2SiO4: Eu2 +, Ca3 (Sc, Mg) 2Si3O12: Ce3 + can be suitably applied.

  8 and 9 are plan views of a light emitting device 30 and a light emitting device 40 which are modifications of the first embodiment. The same components as those of the light emitting device 10 illustrated in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the description of the first embodiment described above, the outer shape of the light emitting device 10 (substrate 11) is a substantially square shape, but the circular light emitting device 30 (substrate 31) as shown in FIG. Furthermore, the shape of the light emitting part is not limited to the shape of FIG. 1, and may be a light emitting part 41 having a circular shape or an elliptical shape as shown in FIGS. 8 and 9.

(Embodiment 2)
Next, as a second embodiment of the present invention, an LED lighting device using the light emitting device of the first embodiment will be described.
FIG. 10 is an assembled perspective view of the LED lighting device 50 according to the second embodiment. FIG. 11 is an exploded perspective view of the LED lighting device 50 of the second embodiment. FIG. 12 is a schematic plan view of a substrate 51 on which the light emitting device 10 provided in the LED lighting device 50 of the second embodiment is mounted.

  With reference to FIGS. 10 to 12, the LED lighting device 50 includes two light emitting devices 10, and the light emitting devices 10 are arranged and mounted on the substrate 51. The substrate 51 is, for example, a glass epoxy substrate, and the surface of the substrate 51 is painted white or a reflective sheet (not shown) is provided so that light is emitted from the light emitting device 10 to the outside as much as possible. It may be.

  The substrate 51 is provided by being fitted in a locking groove 53 of a metal base 52 such as aluminum, and the base 52 also functions as a heat radiating plate that radiates heat transmitted from the light emitting device 10 through the substrate 51. Further, a cover 54 as a diffusion member for diffusing light from the light emitting device 10 is provided on the light irradiation side of the light emitting device 10 on the substrate 51. The cover 54 is made of a resin such as milky white polycarbonate, for example. Yes. This is effective in eliminating glare that is a problem when using a light source having directivity, such as an LED, in a lighting device.

  Further, holding members 55 (55a and 55b) that are fitted in the locking grooves 53 and fix the substrate 51 are provided at both ends of the base 52. The holding member 55 is provided with a groove portion 56 and a lighting device mounting hole 57. The groove portion 56 supplies a direct current to the light emitting device 10 and is connected to a power supply device (not shown) or another lighting device. A connector 58 is provided. The connector 58 is electrically connected to a power line for supplying current and a lead wire 59 that is a control line for controlling the light emitting device. The lighting device mounting hole 57 is inserted with a mounting member (not shown) such as a screw, and the LED lighting device 50 is mounted on a ceiling surface or a wall surface. Furthermore, the exterior member 60 holds the holding member 55 and the cover 54, and the LED lighting device 50 is configured.

(Embodiment 3)
In Embodiments 1 and 2, a module-shaped light emitting device in which a plurality of LEDs on a substrate are covered with a sealing resin layer containing a phosphor is shown and described. However, an LED illumination device 70 in Embodiment 3 is a substrate. The LED illumination device includes a light emitting device that is an LED (an LED generally referred to as a surface-mounted LED) covered with a sealing resin layer containing individual phosphors.

FIG. 13 is an exploded perspective view of the LED lighting device 70 of the third embodiment. FIG. 14 is a plan view of the substrate of the LED lighting device of the third embodiment. The same components as those of the LED lighting device according to the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
As shown in FIG. 13, a plurality of LED package light emitting devices 71 are mounted on a substrate 51 in four rows. Each light emitting device 71 is formed by covering and sealing one blue LED with a sealing resin containing a yellow phosphor as a suppressor. As in the light emitting device described in Embodiment 1, a blue LED in which a gallium nitride compound semiconductor is formed on a sapphire substrate is used, and an epoxy resin containing a yellow phosphor of BOS phosphor (BaSr) 2SiO4: Eu2 + is used. It is sealed. Naturally, other materials described in the first embodiment can also be used as the blue LED, the yellow phosphor, and the sealing resin.

  In order to prevent photosensitive resin such as photoresist from being exposed to light and reacting, for example, in order to suppress the wavelength in the ultraviolet region of i-line (365 nm) and the wavelength in the blue region such as g-line (436 nm), In the combined light of the blue light emitted from the irradiated blue LED and the yellow light emitted from the yellow phosphor, the color coordinate X and the color coordinate Y are adjusted to values as in the light emitting device of the first embodiment.

Furthermore, in addition to the yellow phosphor, the synthetic light can be used as a suppressor for a specific wavelength even if the sealing resin contains a red phosphor or a green phosphor that does not contain a blue region in the light emitted from the phosphor. It is good because the color rendering property of is increased. As the red phosphor and the green phosphor, the materials described in the description of Embodiment 1 can be applied.
Therefore, since the light emitting device 71 of the present embodiment also uses an LED as a light source, a wavelength in the ultraviolet region generated by a mercury lamp or the like does not occur, and a yellow phosphor as a phosphor contained in the sealing resin layer It is possible to suppress the wavelength corresponding to the blue region from reacting with the photosensitive resin.

FIG. 15 is a perspective view of the LED lighting device 82 when the LED lighting device 80 according to the second embodiment or the third embodiment is connected to the power supply unit 81 or another LED lighting device.
The LED lighting device 80 is connected via a connection line 83 to a power source 81 that converts commercial power and supplies power to a light emitting device (not shown) in the LED lighting device 80 and an outlet 82 that connects to the commercial power. ing. A plurality of LED lighting devices may be connected, and the LED lighting device may have a long shape depending on the number of light emitting devices provided in the LED lighting device. Furthermore, the switching unit 84 may be able to control the power ON / OFF of the LED lighting device 82.

(Embodiment 4)
FIG. 16 is a transparent perspective view showing the inside of a clean room C in which the LED lighting device 90 according to the second or third embodiment is provided.
A HEPA filter P for removing dust and the like of circulating air is provided on the ceiling U of the clean room C in FIG. 16, but the LED lighting device 90 is installed on a beam that supports a plurality of HEPA filters P. Is preferred. Since the LED lighting device is small, it is not necessary to newly provide a space for the LED lighting device on the ceiling, and the HEPA filter space factor on the ceiling surface is improved.

  A conventional lighting device such as a fluorescent lamp or a mercury lamp having a filter that cuts off a specific wavelength has a large lamp size, so that an installation space for the lamp is required on the ceiling, and the occupied area of the HEPA filter is low. In addition, the space of the lighting device such as a fluorescent lamp or a mercury lamp installed between the HEPA filters on the ceiling creates a space where no airflow flows in the vicinity of the lighting device, and dust in the air cannot be sufficiently removed. Therefore, there is a problem that the efficiency of cleaning in the clean room is lowered.

  Since the LED lighting device of the present embodiment uses LEDs as a light source, it is a thinner lighting device than conventional fluorescent and mercury lamp lighting devices, and does not interfere with the airflow circulating in the room. Therefore, the dust is carried to the floor without staying in the air due to the airflow accumulation, circulated and removed by the HEPA filter.

  Further, since the LED lighting device is thin and light, the place where the lighting device is installed is not limited to the ceiling, but can also be installed on a wall surface or a device used indoors. Therefore, the number of lighting devices and installation locations can be changed as appropriate according to the indoor environment and work contents, and it is possible to easily cope with changes in the layout in the factory.

(Embodiment 5)
FIG. 17 is a perspective view of an essential part of assembly of the LED lighting device according to the fifth embodiment of the present invention. 18 is an exploded perspective view of an essential part of the LED lighting device of FIG. The LED illumination device according to the fifth embodiment emits light by reducing the amount of light in the blue wavelength region by increasing the amount of yellow phosphor contained in the sealing resin as in the LED illumination devices according to the first to fourth embodiments. The illumination device further includes a cut filter that cuts light in a blue wavelength region included in the light emitted from the light emitting unit.

  The LED illumination device 100 is an elongated illumination device, and includes a casing 102 (hereinafter referred to as “illumination case 102”) that houses the LED 101 as a light source and a light emitting unit, and a power supply circuit that supplies current to the LED 101. A housing 103 (hereinafter referred to as “power supply case 103”) is separately provided, and the illumination case 102 and the power supply case 103 are configured to be detachable from each other.

  The LED lighting device 100 is mounted with bolts with the surface of the power supply case 103 facing the illumination case 102 facing the ceiling surface, and the power supply circuit accommodated in the power supply case 103 is disposed on the back of the ceiling. Connected to the power line from the external power supply. Further, the lighting case 102 and the power supply case 103 are locked, and the LED 101 housed in the lighting case 102 is connected to the power supply circuit inside the power supply case by wiring, so that the LED 101 receives an AC voltage from an external power supply as a power supply circuit. Is converted into a DC voltage and rectified and supplied. Therefore, the illumination device 100 can illuminate the LED 101 by emitting light.

Next, the lighting case 102 and components such as LEDs housed in the lighting case 102 will be described.
The lighting case 102 is made of, for example, aluminum and is a lightweight and heat-dissipating metal, and has a bottom surface 104 and a concave portion that is a groove having a partially bent portion and a tip divided into two along the longitudinal direction. It is an elongated, substantially rectangular parallelepiped shape (a bowl shape) having a side surface 105. Moreover, the illumination case 102 has an opening part in the side facing the both ends and bottom face of a short side.
A plurality of (four in the present embodiment) LED substrates 107 on which a plurality of LEDs 101 are mounted are mounted on the bottom surface 104 of the illumination case 102 with screws in the LED substrate mounting holes 108 on the bottom surface 104.

The LED substrate 107 is a printed wiring board, and a plurality of LEDs 101 are arranged in a matrix at equal intervals. In addition, a wiring pattern (not shown) for energizing the plurality of LEDs 101, a limiting resistor (not shown) for causing a constant current to flow through the LEDs 101, and a connection between the plurality of LED substrates 107 are connected to the LED substrate 107. LED board connector 109 is provided.
Note that two LED board connectors 109 are provided on each LED board 107, and two of them are provided at the end of one side of the LED board 107. Accordingly, the plurality of LED boards 107 are arranged on the side surface with the side having the region where the LED board connector 109 is provided, and are attached to the bottom face 104, thereby connecting the wiring connecting the LED board connector 109 and the LED board connector 109 to the side surface. It can be accommodated in a space formed by 105 bends. Therefore, when the illumination device 100 is viewed from the illuminated side, the LED board connector 109 and the wiring are not visually recognized from the outside.

Further, a reflective sheet 110 is attached to the surface side of the LED substrate 107 on which the LED 101 is mounted. Therefore, the light emitted from the LED 101 can be prevented from being absorbed by the LED substrate 107, so that the amount of light emitted from the lighting device 100 can be prevented from decreasing. For example, a polyethylene terephthalate film is used as the reflection sheet 11.
Further, rectangular power supply case attachment holes 111 for attaching the power supply case 103 and the illumination case 102 are provided at both ends on the short side of the bottom surface 104. Further, side covers 112 that cover the openings at both ends are provided at both ends on the short side of the bottom surface 104. Since the side cover 112 is a white resin having high reflectivity, light can be prevented from leaking from the openings at both ends.

Next, the LED 101 as the light emitting unit will be described.
The LED 101 is a surface-mounted LED composed of a blue LED and a yellow phosphor, and the blue LED is sealed with a sealing resin containing a yellow phosphor. Further, as described above, the LED 101 increases the amount of the yellow phosphor contained in the sealing resin, thereby reducing the light of the blue LED irradiated through the sealing resin. It is possible to emit bright yellow (lemon) light in which the amount of light in the blue wavelength region such as g-ray (436 nm) is reduced.

  Further, as described above, by adjusting the amount of yellow phosphor contained in the sealing resin so that the value of the X color coordinate of the light from the LED 101 is about 0.4, a specific wavelength (for example, g It is possible to prevent the photosensitive resin that reacts to the line) from reacting and to emit light with a large total luminous flux.

  Further, the concave portion 106 at the tip of the side surface 105 of the lighting case 102 covers the LED 101 and blocks light in a specific wavelength region of blue such as an ultraviolet ray wavelength of i-line (365 nm) and g-ray (436 nm). A filter diffusion plate 113 as a blocking means comprising a cut filter and a diffusion plate is fitted. For example, polyethylene terephthalate (refractive index 1.52) is used as a cut filter, and polycarbonate (refractive index: 1.59), acrylic plate (refractive index 1.49), glass, or the like is used as a diffusion plate.

Therefore, the LED lighting device 100 can reduce the amount of light in the blue wavelength region included in the light emitted from the LED 101 in which the yellow phosphor included in the sealing resin is increased, and the filter diffusion plate 113 Furthermore, since the light in the blue wavelength region can be blocked, the light in the blue wavelength region included in the light emitted from the illumination device 100 can be more reliably reduced.
In addition, holding members 114 that press and hold components such as the filter diffusion plate 113 from the irradiation direction side are provided at both ends on the short side of the lighting case 102.

Next, the power supply case 103 and components such as a power supply circuit unit housed in the power supply case 103 will be described.
The power supply case 103 is a rectangular parallelepiped housing made of a metal such as iron, and includes a power connection circuit unit and a quick connection terminal 120 as a connection terminal for connecting a power line from an external power source. Further, the power supply circuit unit is accommodated in a metallic power supply circuit box 121 in order to ensure the safety of the lighting device.
The power supply circuit unit is configured by mounting electronic components (not shown) such as a capacitor and a transformer on the power supply circuit board 122 and is attached to the power supply circuit box 120 via an insulating sheet 123. In order to further secure insulation between the power supply circuit section and the power supply circuit box 120, the power supply circuit section may be molded with a resin such as silicon.

  The length in the longitudinal direction of the power supply case 103 is substantially the same as the length in the longitudinal direction of the lighting case 102, but the length in the short direction of the power supply case 103 is approximately the length in the short direction of the power supply case 102. It is half. Therefore, when the power supply case 103 is attached to the rear surface of the bottom surface 104 of the lighting case 102 at the center of the short side, the rear surface of the lighting case 102 is caused by the difference in length between the short sides of the power supply case 103 and the lighting case 102. A part of is exposed to the outside. Therefore, it is possible to effectively dissipate heat generated from the LED 101 by effectively utilizing the lighting case 102 made of metal such as aluminum having high heat dissipation.

  Further, the power supply circuit unit and the LED substrate 107 have a connector 125 for connecting to each other, and are connected through the power supply case mounting hole 111 of the illumination case 102.

  Although not shown, a lead-in hole for drawing a power line provided on the ceiling is provided on the ceiling-side surface of the power supply case 103, and a resin-made buffer ring is mounted around the hole. Therefore, since the burr around the hole of the lead-in hole formed in the manufacturing process of the lighting device can be covered, the power line is prevented from being damaged by the burr of the lead-in hole when trying to draw the power line into the lead-in hole. Can do. In addition, the lead-in hole may be configured to prevent damage to the power line by performing end face processing such as brim processing instead of mounting the buffer ring.

  Further, the lighting case 102 and the power supply case 103 are locked by hooking the hooks 126 at both ends on the short side of the power supply case 103 to the power supply case mounting holes 111 of the lighting case 102 and locking the lighting case 102. By fitting a locking projection 128 provided in the long side direction of the power supply case 103 into a locking receiving portion 127 having an L-shaped cross section formed along the long side direction on the back surface of the lighting case 102, The power supply case 103 can be firmly locked. Further, the hooking portion 126 is fixed by a retaining screw 129.

Next, the structure of the filter diffusion plate 113 will be described in more detail.
FIG. 19 is a cross-sectional view of the filter diffusion plate 113. FIG. 20 is a diagram for explaining the path of light passing through the filter diffusion plate.

  As shown in FIG. 19, the diffusion plate 131 and the cut filter 132 are bonded to each other by forming an air layer 133 by an adhesive member 134 provided around the diffusion plate 131. As the mounting member 134, an adhesive tape or an adhesive is used, but in order to form the air layer 133 between the diffusion plate 131 and the cut filter 132, it is preferable that there is a certain thickness. Note that the adhesive member 134 may be provided over the entire periphery of the diffusion plate 131, but in order to form and bond the air layer 133 between the diffusion plate 131 and the cut filter 132, It may be provided only in a part of the periphery.

  Therefore, as described above, it is possible to more reliably reduce the light in the blue wavelength region included in the light emitted from the illumination device 100. Further, it is possible to reduce the amount of light absorbed in the cut filter 132 of the filter diffusion plate 113 by providing the air layer 133 without bringing the diffusion plate 131 and the cut filter 132 into close contact with each other.

Next, the reason why the amount of light absorbed in the cut filter 132 of the filter diffusion plate 113 can be reduced by providing the air layer 133 between the diffusion plate 131 and the cut filter 132 will be described.
20A shows a path of light passing through the filter diffusion plate 113 in which the cut filter 132 and the diffusion plate 131 are in close contact, and FIG. 20B shows air between the cut filter 132 and the diffusion plate 131. The path of light passing through the filter diffuser plate 113 provided with the layer 133 is shown.

  Referring to FIG. 20A, in the case of the filter diffusion plate 113 in which the cut filter 132 and the diffusion plate 131 are in close contact, the light emitted from the light source is scattered by the diffusing agent inside the diffusion plate 131. A part of the scattered light is guided through the cut filter 132 as indicated by a solid line in the figure, and when the light reaches the surface of the cut filter 132 with an incident angle greater than or equal to a predetermined incident angle, the cut filter Total reflection occurs at the surface 132. Then, the totally reflected light is guided again through the cut filter 132, travels again with the diffusing agent inside the diffusion plate 131, and travels in the emission direction. Thereafter, the light passes through the cut filter 132 again and is emitted.

  Referring to FIG. 20B, in the case of the filter diffusion plate 113 in which the air layer 133 is provided between the cut filter 132 and the diffusion plate 131, the light emitted from the light source is a diffusion agent inside the diffusion plate 131. Scattered by. A part of the scattered light is totally reflected on the surface of the diffusion plate 131 when it reaches the surface of the diffusion plate 131 at the same incident angle as the light shown in FIG. Then, the totally reflected light is scattered again by the diffusing agent inside the diffusion plate 131, changes the traveling direction to the emission direction, and reaches the surface of the diffusion plate 131 again with an incident angle less than a predetermined incident angle. Is refracted on the surface of the diffusion plate 131 and passes through the cut filter 132 to be emitted. In this case, unlike the light of FIG. 20A, light having a predetermined incident angle or more is first totally reflected on the surface of the diffusion plate 131, and thus light that passes through the cut filter 132 and reaches the surface of the cut filter 132. Most of them reach with an incident angle greater than or equal to a predetermined incident angle. Accordingly, the light is emitted without being totally reflected by the surface of the cut filter 132.

  Therefore, as shown in FIG. 20, the light guide distance in the cut filter 132 when the filter diffuser plate 113 in which the cut filter 132 and the diffuser plate 131 are in close contact with each other is the air guide distance between the cut filter 132 and the diffuser plate 131. This is longer than the light guide distance in the cut filter 132 when the filter diffusion plate 113 provided with the layer 133 is used.

  Further, in the cut filter 132, not only light including a specific wavelength component but also light other than the specific wavelength is slightly absorbed. Therefore, the light having a shorter light guide distance in the cut filter 132 is light caused by absorption in the cut filter 132. The loss of is less. Therefore, the filter diffusion plate 113 in which the air layer 133 is provided between the cut filter 132 and the diffusion plate 131 reduces the reduction in the amount of light compared to the filter diffusion plate 113 in which the cut filter 132 and the diffusion plate 131 are in close contact with each other. be able to.

  Furthermore, since the life of the cut filter 132 is shortened due to light absorption in the cut filter 132, the filter diffuser plate 113 in which the air layer 133 is provided between the cut filter 132 and the diffuser plate 131 has the cut filter 132 and the diffuser plate 131. Compared with the filter diffuser plate 113 in which is adhered, the life can be extended.

  The filter diffusion plate 113 in the present embodiment is configured to provide the air layer 133 between the cut filter 132 and the diffusion plate 131, but is not limited to the air layer 133, and is compared with the cut filter 132 and the diffusion plate 131. Thus, a buffer member having a small refractive index may be used. Further, the buffer member may also serve as the adhesive member.

  The filter diffusion plate 113 in the present embodiment is arranged so that the diffusion plate 131 faces the light source, but the same effect can be obtained even if the cut filter 132 is arranged so as to face the light source. It is possible.

  As described above, in the description of the embodiment, a photosensitive resin such as a photoresist is used by combining a blue LED and a yellow phosphor, a red phosphor, and a green phosphor that emit light when excited by the blue LED, and using the phosphor as a suppressor. Although the light emitting device has been shown in which the wavelength in the ultraviolet region of i-line (365 nm) and the wavelength in the blue region such as g-line (436 nm) are suppressed so as not to react when exposed to light, the LED is not limited to a blue LED. Even if it is LED of other colors, it is applicable if the wavelength of the ultraviolet region of i line (365 nm) and the wavelength of blue region such as g line (436 nm) can be suppressed by appropriately combining other types of phosphors.

In the description of the above embodiment, the phosphor is included in the sealing resin. However, the phosphor may be provided by being applied to the surface of the sealing resin.
Furthermore, the place where the lighting device is installed is not limited to a clean room, and any place where a photosensitive substance is used can be suitably applied.

It is a schematic plan view of Embodiment 1 of the light emitting device of the present invention. It is the schematic block diagram which removed the sealing resin of Embodiment 1 of the light-emitting device of this invention. It is a principal part schematic sectional drawing of Embodiment 1 of the light-emitting device of this invention. The figure which shows the change of the coordinate position in the chromaticity table | surface of the light irradiated from a light emission part when the quantity of the yellow fluorescent substance in the sealing resin layer is changed in Embodiment 1 of the light-emitting device of this invention. It is. In Embodiment 1 of the light-emitting device of this invention, it is a graph which shows the change of the optical spectrum distribution irradiated from a light emission part, when the quantity of the yellow fluorescent substance in a sealing resin layer is changed. In Embodiment 1 of the light-emitting device of this invention, it is a graph which shows the change of the total light beam of the light irradiated from a light emission part when the quantity of the yellow fluorescent substance in a sealing resin layer is changed. (A) In Embodiment 1 of the light-emitting device of this invention, it is a graph which shows the relationship between the weight ratio of sealing resin and yellow fluorescent substance in a sealing resin layer, and the color coordinate X of the light emitted from a light emission part. is there. (B) In Embodiment 1 of the light-emitting device of this invention, it is a graph which shows the relationship between the weight ratio of sealing resin and yellow fluorescent substance in a sealing resin layer, and the color coordinate Y of the light emitted from a light emission part. is there. It is a schematic plan view of the modification of Embodiment 1 of the light-emitting device of this invention. It is a schematic plan view of the modification of Embodiment 1 of the light-emitting device of this invention. It is an assembly perspective view of Embodiment 2 of the LED lighting device of the present invention. It is a disassembled perspective view of Embodiment 2 of the LED lighting apparatus of this invention. It is a schematic plan view of the board | substrate which mounted the light-emitting device provided in Embodiment 2 of the LED lighting apparatus of this invention. It is a disassembled perspective view of Embodiment 3 of the LED lighting apparatus of this invention. It is a schematic plan view of the board | substrate which mounted the light-emitting device provided in Embodiment 3 of the LED lighting apparatus of this invention. It is a perspective view of LED lighting equipment when the LED lighting apparatus of Embodiment 2 or Embodiment 3 of this invention is connected with a power supply part or another LED lighting apparatus. It is a permeation | transmission perspective view which shows the inside of the clean room C with which the LED lighting apparatus of Embodiment 2 or Embodiment 3 of this invention was equipped. It is an assembly principal part perspective view of the LED lighting apparatus of Embodiment 5 of this invention. It is a disassembled principal part perspective view of the LED lighting apparatus of Embodiment 5 of this invention. It is sectional drawing of the filter diffusion plate provided in the LED lighting apparatus of Embodiment 5 of this invention. It is a figure explaining the path | route of the light which passes a filter diffuser plate.

Explanation of symbols

10, 30, 40, 71 Light-emitting device 11 Substrate 12 Blue LED
13 Yellow phosphor 15 Sealing resin layer 50, 70, 80, 90, 100 LED illumination device 113 Filter diffusion plate 131 Diffusion plate 132 Cut filter 133 Air layer

Claims (13)

In a light emitting device comprising a semiconductor light emitting element and a phosphor excited by light from the semiconductor light emitting element,
A light emitting device comprising a suppressor that suppresses a specific wavelength component to which a photosensitive substance reacts. In a light emitting device comprising a semiconductor light emitting element, a phosphor excited by light from the semiconductor light emitting element, and a sealing resin having the phosphor and covering the semiconductor light emitting element,
The light emitting device, wherein the specific wavelength component is suppressed so that a photosensitive substance that reacts with a specific wavelength does not react with the phosphor of the sealing resin.   The light emitting device according to claim 1 or 2, wherein a wavelength region in which the photosensitive substance reacts is a blue region such as g-line.   4. The light emitting device according to claim 1, wherein the amount of the phosphor is larger than the amount of the phosphor included in the sealing resin when the light emitting device emits white light. .   The light emitting device according to any one of claims 1 to 4, wherein the semiconductor light emitting element is a light emitting diode.   The light emitting device according to claim 5, wherein the light emitting diode is a blue LED, and the phosphor is a yellow phosphor.   The light emitted from the light emitting device is included in a range of 0.4 to 0.45 in the X color coordinate in the chromaticity table. Light-emitting device.   The light-emitting device according to claim 1, wherein the sealing resin includes a red phosphor.   The illuminating device provided with the light-emitting device of any one of Claims 1-8.   The lighting device according to claim 9, further comprising a blocking unit configured to block light having the specific wavelength component.   The lighting device according to claim 10, wherein the blocking unit includes a filter and a diffusion plate that block light of a specific wavelength component.   The lighting device according to claim 11, wherein the blocking means includes an air layer between the filter and the diffusion plate.   A clean room comprising the lighting device according to any one of claims 9 to 12.