JP2009060094A - Lighting device - Google Patents

Abstract

Provided is an illumination device that can improve color rendering and suppress a decrease in efficiency.
An illumination device 1 includes a module substrate (device substrate) 3, LEDs (semiconductor light emitting elements) 11a to 11f that emit blue light, and a phosphor that is disposed so that light emitted from the elements is incident thereon. A sheet (phosphor layer) 21 is provided. The LEDs 11 a to 11 f are mounted on the module substrate 3. The phosphor sheet 21 has divided red phosphor regions 21a, 21c, 21e and non-red phosphor regions 21b, 21d, 21f. The red phosphor region includes a red phosphor R that emits red light when excited by blue light. The non-red phosphor region includes different types of phosphors Y1 and Y2 that are excited by blue light and emit light of a color different from red.
[Selection] Figure 3

Description

  The present invention relates to an illuminating device that excites a phosphor with light emitted from a semiconductor light emitting element such as an LED (light emitting diode) to illuminate.

Conventionally, an illumination device that emits white light by mixing light corresponding to the three primary colors of light obtained by exciting red, blue, and green particulate phosphors by ultraviolet rays emitted from ultraviolet LEDs, and blue light emitted by blue LEDs It is known that the illuminating device that emits white light by exciting the particulate yellow phosphor with the light of the light to obtain yellow light complementary to the blue light and mixing the yellow light with the blue light. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 11-46019 (paragraphs 0003, 0004, 0022, FIG. 1)

  Since the former illumination device uses red and green light emitting phosphors, it can emit white light with excellent color rendering. Since the latter illuminating device uses blue light emitted from a blue LED as an excitation energy source, the conversion efficiency into visible light is superior to ultraviolet light that is an excitation energy source of the former illuminating device.

  However, in the latter illumination device using only the yellow phosphor as the phosphor, the red and blue-green light components are insufficient, so that the color rendering properties are inferior to those of the former illumination device.

  Therefore, in order to improve the color rendering properties of the latter lighting device, a red phosphor that emits red light when excited by blue LED light and a green phosphor that emits green light when excited by blue LED light are used. Of these, at least the red phosphor may be mixed with the yellow phosphor. In this way, by using a plurality of types of phosphors having different main wavelengths and mixing the emission colors of these phosphors, the half-value width in the spectral characteristic diagram can be widened and the average color rendering index (Ra) can be improved. it can.

  By the way, as can be seen from the excitation spectrum characteristics of the red phosphor shown in FIG. 9, the red phosphor has a property of absorbing not only blue light but also green light and yellow light to emit red light. It has been known.

  Therefore, as described above, in the configuration in which the particulate red phosphor used for improving the color rendering properties is mixed with the particulate yellow phosphor, the green color emitted from the yellow phosphor when excited by blue light. A part of yellow light, that is, green light and yellow light are absorbed by the red phosphor positioned around the yellow phosphor. As a result, the light output is reduced and darkened. In other words, the efficiency is reduced.

  The objective of this invention is providing the illuminating device which can suppress a fall of efficiency while improving color rendering property.

  The invention of claim 1 is an apparatus substrate; a semiconductor light emitting element that emits blue light mounted on the apparatus substrate; and a phosphor layer that is disposed so that light emitted from the semiconductor light emitting element is incident thereon. A red phosphor region including a red phosphor that is excited by the blue light and emits red light; and a light having a color different from that of the red phosphor region separated from the red phosphor region and excited by the blue light. And a phosphor layer having a non-red phosphor region containing another type of phosphor emitting light.

  According to a second aspect of the present invention, there is provided an apparatus substrate; a semiconductor light emitting element that emits blue light mounted on the apparatus substrate; and a phosphor sheet that is disposed so that light emitted from the semiconductor light emitting element is incident thereon. A red phosphor region including a red phosphor that emits red light when excited by the blue light, and is separated from the red phosphor region and excited by the blue light. And a phosphor layer having a non-red phosphor region containing a different type of phosphor that emits light of a color different from that of red.

  In the first and second aspects of the invention, a blue LED having a dominant wavelength of, for example, 460 nm can be suitably used as the semiconductor light emitting element that emits blue light. In the inventions of claims 1 and 2, the semiconductor light emitting device can be mounted on the device substrate by flip chip mounting or using a die bond material. In the latter case, the circuit pattern and the semiconductor light emitting device provided on the substrate are They are connected via bonding wires.

  In the invention of claim 1, the phosphor layer includes an embodiment formed by printing, for example, screen printing, and an embodiment formed by the phosphor sheet of the invention of claim 2. In the first and second aspects of the invention, the phosphor layer refers to a light transmission layer including at least a phosphor-containing layer containing two or more kinds of phosphors. Therefore, only the light transmission layer is fluorescent. It is also possible to form a body layer. And the fluorescent substance sheet | seat which makes a fluorescent substance layer can also be formed by laminating | stacking the said fluorescent substance containing layer on a translucent sheet | seat base material. In this case, translucent glass, a translucent film, translucent ceramics, etc. can be used for a sheet base material, and a fluorescent substance content layer may be laminated on a sheet base material by printing. Such a phosphor sheet having a two-layer structure is preferable in that the phosphor-containing layer can be easily printed.

  The phosphor is completely dispersed in the light-transmitting substrate of the phosphor-containing layer, that is, the phosphor along the thickness direction of the light-transmitting substrate in order to suppress a decrease in the brightness of the illumination due to the density. It is preferable to be dispersed so as to have a uniform density. A transparent silicone resin, a transparent silicone rubber, or the like can be suitably used for the translucent substrate, but is not limited to this, and other translucent resins can be used, as well as transparent glass and translucent Ceramics can also be used.

In the first and second aspects of the invention, one of the at least two kinds of phosphors is a red phosphor, and specifically, Sr2Si5N8: Eu, CaA1SiN3: Eu, La2O2S, and the like can be preferably exemplified. Examples of another type of phosphor that emits light of a color other than red include yellow phosphors that emit green to yellow light. Specific examples of the yellow phosphor include oxide phosphors such as Ca ₃ Sc ₂ O ₄ : Ce, or silicate systems such as (Ba, Sr) 2SiO4: Eu and (Ba, Sr, MgCa) 2SiO4: Eu, A sialon-based phosphor, YAG, (Ca, Sr, Ba) Si ₂ ON ₂ : Eu, thiogallate, or the like can be preferably used. In addition, a green phosphor that emits green light when excited with blue light as another type of phosphor may be added as necessary.

  In the first and second aspects of the invention, it is preferable that the red phosphor region and the non-red phosphor region are separated using a partition member interposed between these regions. However, the red phosphor region and the non-red phosphor region are brought into contact with each other without using such a partition member, or the red phosphor region and the non-red phosphor region are not contacted without using a partition member. It is also possible to separate the red phosphor region and the non-red phosphor region adjacent to the state.

  According to the first and second aspects of the present invention, the blue light emitted from the semiconductor light emitting element causes the red phosphor contained in the red phosphor region and the non-red fluorescence such as the yellow phosphor contained in the non-red phosphor region. The body is excited. By this excitation, the red phosphor emits red light for improving the color rendering, and the non-red phosphor emits light of a color different from red, such as yellow, so that the phosphor contained in the phosphor layer emits. Light and blue light that passes through the phosphor layer are mixed for illumination.

  With this illumination, the red phosphor region and the non-red phosphor region of the phosphor layer are separated, and the non-red phosphor such as the red phosphor and the yellow phosphor is not mixed. The red phosphor absorbs part of the light emitted from the red phosphor. Therefore, according to the first and second aspects of the invention, the color rendering can be improved while suppressing a decrease in efficiency.

  The invention of claim 3 is that in the invention of claim 1 or 2, a sealing member made of a light-transmitting material is filled between the device substrate and the phosphor layer by filling the semiconductor light emitting element. It is a feature.

  In the invention of claim 3, a transparent silicone resin, a transparent silicone rubber, a silicone resin, or the like, which is the same material as the transparent substrate of the phosphor layer, is preferably used as the transparent material forming the sealing member. However, the present invention is not limited to this, and other translucent resins can be used, and transparent glass, translucent ceramics, and the like can also be used.

  In the invention of claim 3, since the sealing member is filled so that there is no air layer between the device substrate and the phosphor layer, the light incident on the phosphor layer on which the blue light emitted from the semiconductor light emitting element is incident The reflection loss of light on the surface is suppressed. This facilitates excitation of the phosphor contained in the phosphor layer and increases the amount of blue light transmitted to the phosphor layer, thereby improving efficiency.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein at least the front surface or the back surface of the red phosphor region or the back surface of the red phosphor region and the non-red phosphor region, or these. Both sides are light diffusing surfaces.

  In the invention of claim 4, the center line average roughness defining the roughness of the light diffusion surface is preferably 0.30 μm to 1.50 μm. In the invention of claim 4, in order to make at least the surface of the red phosphor region a light diffusion surface, when the phosphor layer is formed by screen printing, for example, the mesh of the printing screen and the printing screen and the printing object By adjusting the distance between the two, it is possible to make the surface of the phosphor layer a light diffusing surface having a desired centerline average roughness. In addition, the surface of the object to be printed, for example, the surface of the substrate is formed in advance to have a desired centerline average roughness by frosting, and the phosphor layer is formed by printing on the surface to be printed. The back surface of the body layer can be a light diffusing surface having a center line average roughness commensurate with the surface roughness of the surface to be printed. In addition, when the phosphor layer is a phosphor sheet, at least the surface or the back surface of the manufactured phosphor sheet is processed to form irregularities on the surface or the back surface, and the desired centerline average roughness is obtained. It is possible to form a light diffusing surface. When the light diffusing surface is provided so as to be continuous over both the red light emitting region and the non-red light emitting region, it is not necessary to select a processing location when performing the uneven processing, so that workability is good. In addition, it is preferable for promoting the mixing of light on the light emission side as described later.

  In the invention of claim 4, since the red light emitted from at least the red phosphor region of the phosphor layer is diffused, it is possible to suppress the red light emitter region from being visually recognized. Furthermore, since the diffused red light is likely to be mixed with white light or the like emitted from the non-red light emitter region adjacent to the red light emitter region, color unevenness on the irradiated surface can be suppressed.

  The invention of claim 5 is the invention according to any one of claims 1 to 4, wherein a plurality of phosphor regions into which the phosphor layer is divided when viewed from the phosphor layer side toward the device substrate are provided. A light-emitting device system corresponding to each phosphor region is arranged for each projection region projected on the device substrate, and a lighting device for separately controlling lighting of each light-emitting device system is provided. .

  In the invention of claim 5, the number of semiconductor light emitting elements arranged for each projection area of each phosphor area may be one, but a plurality of semiconductor light emitting elements are arranged to obtain a desired light quantity. It is preferable.

  According to the invention of claim 5, the semiconductor light emitting element at a desired position by the lighting device by utilizing the structure in which the phosphor layer has a region divided for each kind of phosphor contained therein. By selecting and lighting, the light of the color determined by the blue light emitted from the lit semiconductor light emitting element and the light emitted by the phosphor excited in the phosphor region where the light is incident can be obtained. Can do. That is, it is possible to illuminate by changing the color temperature of the illumination light by the selective lighting.

  According to the first to fourth aspects of the present invention, the color rendering property can be improved by providing the red phosphor, and the red phosphor absorbs part of the light emitted by the phosphor other than the red phosphor. By suppressing, the illuminating device which can suppress the fall of efficiency can be provided.

  According to the invention of claim 5, the semiconductor light emitting element is selectively lit by the lighting device by utilizing the structure in which the phosphor layer has a region divided for each type of phosphor contained therein. By doing so, it is possible to provide an illumination device capable of changing the color temperature of illumination light.

A first embodiment of the present invention will be described with reference to FIGS. 1 to 8. Reference numeral 1 in FIGS. 1 and 2 denotes an illumination device used in the field of general illumination. The lighting device 1 includes, for example, a COB (chip on board) type light emitting module 2 and a lighting device 31.

  The light emitting module 2 includes an apparatus substrate such as a module substrate 3, a plurality of semiconductor light emitting elements, a frame member 17, a sealing member 19 (see FIG. 3 and FIG. 4), and a phosphor layer such as a phosphor sheet 21. I have.

  The module substrate 3 has a quadrangular shape, and has a circuit pattern (not shown) and electrodes 4a to 4l connected to the circuit pattern on one surface of the module substrate 3.

  For example, semiconductor light-emitting elements composed of chip-like LEDs having a dominant wavelength of 460 nm and emitting blue light are mounted on the entire surface of the module substrate 3 so as to be aligned vertically and horizontally.

  In the light emitting module 2 shown in Example 1 of FIGS. 1 and 3A and 3B, each LED 11a to 11f is divided into a plurality of light emitting systems, specifically, a first light emitting system and a second light emitting system. The first and second light emitting systems are alternately provided in the vertical direction (vertical direction) in FIG.

  The plurality of LEDs 11a belonging to the first light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4a, and the other end is connected to the electrode 4b. It is connected. A plurality of other LEDs 11c belonging to the first light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4e, and the other end is an electrode. 4f. A plurality of other LEDs 11e belonging to the first light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4i, and the other end is connected to the electrode 4i. It is connected to the electrode 4j.

  Similarly, the plurality of LEDs 11b belonging to the second light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4c, and the other end is connected to the electrode 4c. It is connected to the electrode 4d. The other plurality of LEDs 11d belonging to the second light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4g, and the other end is an electrode. Connected to 4h. A plurality of other LEDs 11f belonging to the second light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of this series circuit is connected to the electrode 4k, and the other end is connected to the electrode 4k. It is connected to the electrode 4l.

  In the light emitting module 2 shown in Example 2 of FIGS. 2 and 4A and 4B, each LED 11a to 11f includes a plurality of light emitting systems, specifically, a first light emitting system, a second light emitting system, and a third light emitting system. The first to third light emitting systems are alternately provided in the vertical direction (vertical direction) in FIG.

  The plurality of LEDs 11a belonging to the first light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4a, and the other end is connected to the electrode 4b. It is connected. The other plurality of LEDs 11d belonging to the first light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4g, and the other end is an electrode. Connected to 4h.

  Similarly, the plurality of LEDs 11b belonging to the second light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4c, and the other end is connected to the electrode 4c. It is connected to the electrode 4d. A plurality of other LEDs 11e belonging to the second light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4i, and the other end is an electrode. 4j.

  Similarly, the plurality of LEDs 11c belonging to the third light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of the series circuit is connected to the electrode 4e, and the other end is connected to the electrode 4e. It is connected to the electrode 4f. The other plurality of LEDs 11f belonging to the third light emitting system are connected in series by a circuit pattern of the module substrate 3 and a bonding wire (not shown). One end of this series circuit is connected to the electrode 4k, and the other end is an electrode. 4l.

  The frame member 17 has a rectangular frame shape, and is attached to the surface of the module substrate 3 so as to surround the LEDs 11a to 11f. The electrodes 4 a to 4 l intersect with one side of the frame member 17. The frame member 17 is preferably formed of a white synthetic resin or the like so that light can be reflected on the inner surface thereof.

  The sealing member 19 is filled inside the frame member 17 and fills the LEDs 11a to 11f, the wiring pattern, and the bonding wires, and seals them. For example, a transparent silicone resin is used for the sealing member 19.

  The phosphor sheet 21 is provided in contact with the surface of the sealing member 19 so that light emitted from the LEDs 11a to 11f enters. Therefore, the sealing member 19 is filled between the phosphor sheet 21 and the module substrate 3. Thereby, as the air layer no longer exists between the module substrate 3 and the phosphor sheet 21, the light reflection loss at the light incident surface of the phosphor sheet 21 on which the blue light emitted from the LEDs 11 a to 11 f enters. Is suppressed. Therefore, it becomes easy to excite the phosphor contained in the phosphor sheet 21 as described later, and the amount of blue light transmitted to the phosphor sheet 21 increases, so that the efficiency can be improved.

  The thickness of the phosphor sheet 21 that defines the optical path length of the phosphor sheet 21 is, for example, 0.5 mm.

The phosphor sheet 21 has a plurality of phosphor regions divided by the partition member 22. The partition member 22 includes, for example, a frame portion 22a disposed along the inner surface of the frame member 17, and a partition plate 22b that partitions the inside of the frame portion 22a into a plurality of strip-shaped regions. The partition plate 22b may be formed of a light-shielding material in order to prevent light interference between adjacent phosphor regions, and preferably has light reflection performance.

  As illustrated in FIGS. 1 and 2, the phosphor sheet 21 has a first phosphor region 21 a to a sixth phosphor region 21 f divided by the partition plate 22 b. Each of these phosphor regions 21a to 21f is provided corresponding to each series circuit.

  Therefore, when viewed from the phosphor sheet 21 side in the direction of the module substrate 3, the plurality of LEDs 11 a are arranged in the projection region where the first phosphor region 21 a is projected onto the module substrate 3, and the second phosphor region 21 b is the module. A plurality of LEDs 11 b are arranged in the projection area projected onto the substrate 3, and a plurality of LEDs 11 c are arranged in the projection area where the third phosphor area 21 c is projected onto the module substrate 3. Similarly, when viewed from the phosphor sheet 21 side in the direction of the module substrate 3, a plurality of LEDs 11 d are arranged in a projection region where the fourth phosphor region 21 d is projected onto the module substrate 3, and a fifth phosphor region 21 e is formed. A plurality of LEDs 11 e are arranged in the projection area projected onto the module substrate 3, and a plurality of LEDs 11 f are arranged in the projection area where the sixth phosphor region 21 f is projected onto the module board 3.

  In Example 1 of FIG.1 and FIG.3 (A) (B), the 1st fluorescent substance area | region 21a, the 3rd fluorescent substance area | region 21c, and the 5th fluorescent substance area | region 21e which are arrange | positioned every other are comprised. A red phosphor region is formed. Similarly, in Example 2 of FIG. 2 and FIGS. 4A and 4B, the first phosphor region 21a and the fourth phosphor region 21d that are arranged every two are red phosphor regions. Yes. In the drawing, a subscript (red) is added as necessary to facilitate identification of the red phosphor region after the code indicating the phosphor region.

  These red phosphor regions are formed on the sheet substrate S of the phosphor sheet 21 made of a translucent phosphor-containing layer such as a transparent silicone resin as shown in FIGS. 3 (B) and 4 (B). Particulate red phosphor R is included, preferably formed by completely dispersing red phosphor R. The red phosphor R emits red light when excited by blue light emitted from a blue LED, and the main wavelength of the light is, for example, 620 nm to 650 nm.

  For example, the red phosphor region is formed by injecting and mixing the liquid A and the liquid B, which form a two-part silicone resin mixed with the red phosphor R, into a predetermined region partitioned by the partition member 22 in an uncured state. To react. Next, the resin is cured by heating in this reaction state. Thereby, the sheet-like red phosphor region in a state in which the red phosphor R is uniformly dispersed and contained in the entire thickness direction of the sheet base material S without being settled and biased by its own weight is formed.

  In Example 1 of FIGS. 1 and 3A and 3B, the second phosphor region 21b, the fourth phosphor region 21d, and the sixth phosphor region alternately arranged with the first phosphor region 21a. The phosphor region 21f forms a non-red phosphor region. Similarly, in Example 2 of FIGS. 2 and 4A and 4B, the second phosphor region 21b and the fifth phosphor region 21e form the first non-red phosphor region, The third phosphor region 21c and the sixth phosphor region 21f form a second non-red phosphor region. In the drawing, a subscript (yellow) or (green) indicating the color of the phosphor in the region is added as necessary after the code indicating the non-red phosphor region for easy identification of the phosphor region. To do.

  The non-phosphor regions (regions 21b, 21d, 21f) in Example 1 and the non-red phosphor regions (regions 21b, 21c, 21e, 21f) in Example 2 are shown in FIGS. As shown in B), the translucent phosphor-containing layer, for example, a translucent sheet substrate S made of a transparent two-component silicone resin or the like contains at least one of the particulate yellow phosphors Y1 and Y2. Preferably, it is formed by completely dispersing.

  Specifically, as shown in FIG. 3B, in Example 1, the yellow phosphor Y1 that is excited by the blue light emitted from the blue LED and emits yellow light having a dominant wavelength of 540 nm, and the blue LED emitted. A yellow phosphor Y2 that is excited by blue light and emits yellow light having a dominant wavelength of 565 nm is mixed and completely dispersed in the sheet substrate S. As shown in FIG. 4B, the first non-red phosphor regions (regions 21b and 21e) in Example 2 are formed by completely dispersing the yellow phosphor Y1 in the sheet base material S. The non-red phosphor regions (regions 21c and 21f) are formed by completely dispersing the yellow phosphor Y2 in the sheet substrate S.

  These non-red phosphor regions are also in an uncured state in the same way as in the method for forming the red phosphor region described above, in the liquid A and the liquid B that form a two-part silicone resin mixed with a yellow-red phosphor. Then, the reaction is carried out by injecting and mixing in a predetermined region partitioned by the partition member 22. Next, the resin is cured by heating in this reaction state. Thereby, the sheet-like non-red phosphor region in a state where the yellow phosphor or the like is evenly dispersed in the entire thickness direction of the sheet substrate S without being settled by its own weight is formed.

  The phosphor sheet 21 in which the red phosphor region and the non-red phosphor region such as yellow are separated, as shown in FIG. 1 and FIG. The red phosphor regions and the non-red phosphor regions are alternately arranged.

  Thus, by using the phosphor sheet 21 in which the red phosphor region and the non-red phosphor region are divided so that they are not mixed, the non-red phosphor such as a yellow phosphor is excited and emitted. Since the red phosphor absorbs a part of the light as excitation energy is suppressed, the efficiency can be improved as will be apparent from the comparison between examples and comparative examples described later.

  In the present embodiment, the light that is emitted when the non-red phosphor region such as yellow is excited is incident on the red phosphor region adjacent to this region. It can be prevented by the member 22. Further, even when the non-red phosphor region such as yellow and the red phosphor region are directly adjacent to each other without using the partition member 22, the peripheral portion of the red phosphor region that is in contact with the non-red phosphor region Then, although a part of the light emitted by the non-red phosphor due to the excitation is absorbed, the light emitted by the non-red phosphor due to the excitation does not reach the inside of the peripheral portion, as described above. Efficiency can be improved.

  Since the phosphor sheet 21 can be produced by itself, instead of using this phosphor sheet 21, as compared with the case where the phosphor is dispersed in the sealing member 19 and divided for each type of phosphor, It is preferable not only because it is easy to manufacture, but also because there is little variation in the quality of the manufactured phosphor sheet. Moreover, as described above, the phosphor sheet 21 is as thin as 0.5 mm, for example. For this reason, instead of using the phosphor sheet 21, a much thicker seal than the phosphor sheet 21 is used as compared with the case where the phosphor is dispersed in the sealing member 19 and divided for each type of phosphor. It is possible to suppress the occurrence of angular color difference due to the stop member 19. The phosphor sheet 21 can be detachably provided on the surface of the sealing member 19. In this case, since the phosphor sheet 21 can be replaced as necessary, the yield of the light emitting modules 2 of the lighting device 1 can be improved.

  As shown in FIGS. 1 and 2, the lighting device 31 includes a control unit 32, the same number of pulse generation circuits as the number of light emitting systems, and an input unit 33. Accordingly, the first pulse generator 34 and the second pulse generator 35 are provided in the first embodiment of FIG. 1, and the first pulse generator 34 and the second pulse generator 35 are provided in the second embodiment of FIG. In addition, a third pulse generator 36 is provided.

  The output terminal of the first pulse generator 34 in the first embodiment is electrically connected to the electrodes 4a and 4b, the electrodes 4e and 4f, and the electrodes 4i and 4j. Thereby, each 1st light emission system | strain is electrically connected in parallel. Similarly, the output terminal of the second pulse generator 35 in the first embodiment is electrically connected to the electrodes 4c and 4d, the electrodes 4g and 4h, and the electrodes 4k and 4l. Thereby, each 2nd light emission system is electrically connected in parallel.

  The output terminal of the first pulse generator 34 in the second embodiment is electrically connected to the electrodes 4a and 4b and the electrodes 4g and 4h, whereby the first light emitting systems are electrically connected in parallel. Has been. Similarly, the output terminal of the second pulse generator 35 in the second embodiment is electrically connected to the electrodes 4c and 4d and the electrodes 4i and 4j, whereby each second light emitting system is electrically connected. Connected in parallel. Similarly, the output terminal of the third pulse generator 36 in the second embodiment is electrically connected to the electrodes 4e and 4f and the electrodes 4k and 4l, whereby each third light emitting system is electrically connected. Connected in parallel.

  The control unit 32 controls the generation timing of the pulses generated by each pulse generator, the pulse width and the peak value of this pulse, and the like. A DC power source 30 is connected to the control unit 32. The input unit 33 is an operation unit for selecting the color temperature (Tc) of the light emitting module 2.

  Therefore, the illumination devices 1 according to the first and second embodiments can illuminate by changing the color temperature according to designation by the input unit 33.

  Specifically, in the illuminating device 1 of Example 1, it can illuminate with the white light by which the color rendering property was improved with the red fluorescent substance R by designating and lighting all LED11a-11f. At the same time, only the LEDs 11a, 11c, and 11e arranged so as to face only the phosphor regions 21a, 21c, and 21e containing the red phosphor R in a dispersed manner are designated and turned on, thereby the red phosphor R. Can be illuminated with a mixture of light emitted by excitation and blue light. Furthermore, only the LEDs 11b, 11d, and 11f that are arranged so as to face only the phosphor regions 21b, 21d, and 21f that are mixedly dispersed and mixed with the yellow phosphors Y1 and Y2 are specified and turned on. The yellow phosphors Y1 and Y2 thus excited can be illuminated with light mixed with light emitted from blue light.

  Similarly, in the illuminating device 1 of Example 2, it can illuminate with the white light by which the color rendering property was improved with the red fluorescent substance R by designating and lighting all LED11a-11f. At the same time, the red phosphor R is excited by designating and lighting only the LEDs 11a and 11d arranged so as to face only the phosphor regions 21a and 21d containing the red phosphor R in a dispersed manner. It can be illuminated with a mixture of emitted light and blue light. Furthermore, by designating and lighting only the LEDs 11b and 11e arranged so as to face only the phosphor regions 21b and 21e in which the yellow phosphor Y1 is dispersedly contained, the yellow phosphor Y1 is excited and emits light. It can be illuminated with a mixture of light and blue light. In addition, by designating and lighting only the LEDs 11c and 11f arranged so as to face only the phosphor regions 21c and 21f in which the yellow phosphor Y2 is dispersedly contained, the yellow phosphor Y2 is excited and emits light. It can be illuminated with a mixture of light and blue light.

  Next, the lighting devices of Examples 1 and 2 and the lighting devices of Examples 3 and 4 having the same configuration as these are created, and the lighting devices of Comparative Examples 1 and 2 are created, and these lighting devices are turned on. Measure the spectrum with a spectrometer, calculate the color temperature (Tc), its deviation (duv), and the average color rendering index (Ra) from the obtained spectrum, and measure the efficiency by the gonio method using a goniophotometer. did. The above measurement is performed under the condition that all the LEDs 11a to 11f included in each lighting device are turned on to illuminate with white light, and the instantaneous spectrometer MCPD-7000 manufactured by Otsuka Electronics Co., Ltd. is used for spectrum measurement. Was used. The results are shown in FIGS. In addition, the numerical value for each phosphor in the phosphor specification in FIG. 7 (A) is the composition of the phosphor contained in the sheet base material when the weight of the sheet base material of the phosphor sheet is 100% by weight. The ratio (% by weight) is shown.

  In Examples 1 and 2 and Comparative Example 1 for these examples, an attempt was made to obtain the characteristic that Ra becomes 80 at a color temperature of 5000 K. In these examples, red is used as a phosphor for improving color rendering. Only phosphors were used.

  In the illumination device of Comparative Example 1, instead of the phosphor sheet 21 having a thickness of 0.5 mm provided in the light emitting module 2 described above, a red phosphor R having a dominant wavelength of 650 nm, and a yellow phosphor Y1 having a dominant wavelength of 540 nm A phosphor sheet in which three types of phosphors of yellow phosphor Y2 having a dominant wavelength of 565 nm were mixed was used. The mixing ratio of these three phosphors is as shown in FIG.

  The color temperature of light passing through the phosphor sheet used in Comparative Example 1 was 5121K, its duv was -0.0039, and Ra was 80. Then, this Comparative Example 1 was used as a standard for efficiency evaluation of Examples 1 and 2 (efficiency 100%).

  In the illuminating device of Example 1, as described above, the red phosphor region (that is, the first phosphor layer 21 including the red phosphor R having a dominant wavelength of 650 nm included in the phosphor sheet 21 having a thickness of 0.5 mm included in the light emitting module 2). 1 phosphor region 21a, third phosphor region 21c, fifth phosphor region 21e), yellow phosphor Y1 having a dominant wavelength of 540 nm, and yellow phosphor Y2 having a dominant wavelength of 565 nm are completely mixed. A phosphor sheet 21 having a configuration in which dispersed non-red phosphor regions (that is, the second phosphor region 21b, the fourth phosphor region 21d, and the sixth phosphor region 21f) are provided alternately in a divided manner. Was used. The mixing ratio of these two phosphors is as shown in FIG.

  In the lighting device of Example 1, the color temperature of the light that passed through the phosphor sheet 21 was 5004K, the duv was −0.0014, and Ra was 80. And the efficiency of the light taken out through the phosphor sheet 21 was 120% with respect to Comparative Example 1.

  In the illuminating device of Example 2, as described above, the phosphor sheet 21 having a thickness of 0.5 mm included in the light-emitting module 2 includes the red phosphor region (that is, the first phosphor region including the red phosphor R having a dominant wavelength of 650 nm). 1 phosphor region 21a and fourth phosphor region 21d) and a non-red phosphor region in which yellow phosphor Y1 having a dominant wavelength of 540 nm is completely dispersed (that is, second phosphor region 21b and fifth phosphor region 21d). The phosphor region 21e) and the non-red phosphor region in which the yellow phosphor Y2 having a dominant wavelength of 565 nm is completely dispersed (that is, the third phosphor region 21c and the sixth phosphor region 21f) are divided and alternated. The phosphor sheet 21 having the configuration provided in FIG. The mixing ratio of these three phosphors is as shown in FIG.

  In the lighting device of Example 2, the color temperature of the light that passed through the phosphor sheet 21 was 5004K, the duv was −0.0014, and Ra was 80. And the efficiency of the light taken out through the phosphor sheet 21 was 121% with respect to Comparative Example 1.

  The spectral characteristics of Examples 1 and 2 having the same color temperature and Ra in the above results are as shown in FIG. From the above comparison, it was confirmed that the efficiency of Examples 1 and 2 can be improved over that of Comparative Example 1 when illumination is performed with illumination light having Ra of 80 at a color temperature of 5000K. Further, in order to obtain this characteristic, the amount of phosphors other than the red phosphor could be reduced as can be seen from the comparison of the phosphor blending ratio in FIG.

  Further, Examples 3 and 4 and Comparative Example 2 for these both tried to obtain the characteristic that Ra was 90 at a color temperature of 5000 K. In these examples, as phosphors for improving color rendering properties, Red phosphor R and green phosphor G were used.

  In the lighting device of Comparative Example 2, instead of the phosphor sheet 21 having a thickness of 0.5 mm provided in the light emitting module 2, a green phosphor G having a dominant wavelength of 520 nm, a red phosphor R having a dominant wavelength of 650 nm, A phosphor sheet in which three types of phosphors of yellow phosphor Y1 having a wavelength of 540 nm were mixed was used. The mixing ratio of these three phosphors is as shown in FIG.

  The color temperature of light passing through the phosphor sheet used in Comparative Example 2 was 5121K, its duv was -0.0039, and Ra was 90. And this comparative example 2 was made into the standard (efficiency 100%) of the efficiency evaluation of Example 3,4.

  The illuminating device of Example 3 has the same configuration as the illuminating device of Example 1, but the phosphor sheet 21 having a thickness of 0.5 mm provided in the light emitting module 2 as shown in FIGS. Things were used. That is, a red phosphor region including the red phosphor R having a dominant wavelength of 650 nm (that is, the first phosphor region 21a, the third phosphor region 21c, and the fifth phosphor region 21e), and the main wavelength Is a non-red phosphor region that is completely dispersed in a state where a green phosphor G having a wavelength of 520 nm and a yellow phosphor Y1 having a dominant wavelength of 540 nm are mixed (that is, the second phosphor region 21b, the fourth phosphor region 21d, A phosphor sheet 21 having a configuration in which sixth phosphor regions 21f) are provided alternately in a divided manner was used. The mixing ratio of these two phosphors is as shown in FIG.

  In the lighting device of Example 3, the color temperature of the light that passed through the phosphor sheet 21 was 5012K, the duv was −0.0015, and Ra was 90. And the efficiency of the light taken out through the phosphor sheet 21 was 115% with respect to Comparative Example 2.

  The illuminating device of Example 4 has the same configuration as the illuminating device of Example 2, but as shown in FIGS. Things were used. That is, the red phosphor region (that is, the first phosphor region 21a and the fourth phosphor region 21d) including the red phosphor R having the dominant wavelength of 650 nm and the yellow phosphor Y1 having the dominant wavelength of 540 nm are included. A completely dispersed non-red phosphor region (that is, second phosphor region 21b and fifth phosphor region 21e) and a non-red phosphor region in which green phosphor G having a dominant wavelength of 520 nm is completely dispersed ( That is, the phosphor sheet 21 having a configuration in which the third phosphor region 21c and the sixth phosphor region 21f) are divided and provided alternately is used. The mixing ratio of these three phosphors is as shown in FIG.

  In the lighting device of Example 4, the color temperature of the light passing through the phosphor sheet 21 was 5012K, the duv was −0.0015, and Ra was 90. And the efficiency of the light taken out through the phosphor sheet 21 was 111% with respect to Comparative Example 1.

  The spectral characteristics of Examples 3 and 4 having the same color temperature and Ra in the above results are as shown in FIG. 7C, and the color rendering properties of Examples 1 and 2 by using the green phosphor G are as follows. Even more improved. From the above comparison, it was confirmed that Examples 3 and 4 can improve efficiency over Comparative Example 2 when illumination is performed with illumination light having Ra of 90 at a color temperature of 5000K. Further, in order to obtain this characteristic, the amount of phosphors other than the red phosphor could be reduced as can be seen from the comparison of the phosphor blending ratio in FIG.

  Next, the lighting devices of Examples 5 to 8 having the same configuration as those of Examples 1 to 4 and Comparative Examples 3 and 4 were prepared, and the same measurement as described above and evaluation based thereon were performed. The results are shown in FIGS.

  The lighting devices of Examples 5 to 8 and Comparative Examples 3 and 4 are intended to obtain the characteristic that Ra becomes 80 or 90 at a color temperature of 3000 K. In these examples, the color rendering property is improved. As a phosphor for the purpose, a red phosphor and a green phosphor were used.

  In the lighting device of Comparative Example 3, instead of the phosphor sheet 21 having a thickness of 0.5 mm provided in the light emitting module 2 described above, a green phosphor G having a dominant wavelength of 520 nm, a red phosphor R having a dominant wavelength of 650 nm, A phosphor sheet in which three types of phosphors of yellow phosphor Y2 having a dominant wavelength of 565 nm were mixed was used. The blending ratio of these three phosphors is as shown in FIG.

  The color temperature of light passing through the phosphor sheet used in Comparative Example 3 was 3174K, its duv was -0.0015, and Ra was 80. And this comparative example 3 was made into the standard (efficiency 100%) of the efficiency evaluation of Examples 5 and 6.

  In the illuminating device of Example 5 having the same configuration as that of Example 1, the phosphor sheet 21 having a thickness of 0.5 mm provided in the light emitting module 2 includes a red phosphor region (including a red phosphor R having a dominant wavelength of 650 nm) ( That is, the first phosphor region 21a, the third phosphor region 21c, and the fifth phosphor region 21e), the green phosphor G having a dominant wavelength of 520 nm, and the yellow phosphor Y2 having a dominant wavelength of 565 nm are mixed. Fluorescence having a configuration in which non-red phosphor regions (that is, second phosphor region 21b, fourth phosphor region 21d, and sixth phosphor region 21f) that are completely dispersed in a state are divided and provided alternately A body sheet 21 was used. The mixing ratio of these two phosphors is as shown in FIG.

  In the illuminating device of Example 5, the color temperature of light passing through the phosphor sheet 21 was 3005 K, the duv was −0.0014, and Ra was 82. And the efficiency of the light taken out through the phosphor sheet 21 was 121% with respect to Comparative Example 3.

  In the illuminating device of Example 6 having the same configuration as that of Example 2, the phosphor sheet 21 having a thickness of 0.5 mm included in the light-emitting module 2 includes a red phosphor region in which the red phosphor R having a dominant wavelength of 650 nm is included ( That is, the first phosphor region 21a and the fourth phosphor region 21d) and the non-red phosphor region in which the yellow phosphor Y2 having a dominant wavelength of 565 nm is completely dispersed (that is, the second phosphor region 21b and The fifth phosphor region 21e) is separated from the non-red phosphor region (that is, the third phosphor region 21c and the sixth phosphor region 21f) in which the green phosphor G having a dominant wavelength of 520 nm is completely dispersed. Thus, phosphor sheets 21 having a configuration provided alternately were used. The blending ratio of these three phosphors is as shown in FIG.

  In the illuminating device of Example 6, the color temperature of the light that passed through the phosphor sheet 21 was 3004 K, the duv was −0.0014, and Ra was 82. And the efficiency of the light taken out through the phosphor sheet 21 was 120% with respect to Comparative Example 3.

  The spectral characteristics of Examples 5 and 6 having the same color temperature and Ra in the above results are as shown in FIG. 8C, and the color rendering properties are achieved by using the red phosphor R and the green phosphor G. Improved. It was confirmed from the above comparison that Examples 5 and 6 can improve efficiency over Comparative Example 3 when illumination is performed with illumination light having Ra of 80 at a color temperature of 3000K. Further, in order to obtain this characteristic, the amount of phosphors other than the red phosphors can be reduced as can be seen from the comparison of the blending ratios of the phosphors in FIG.

  In the illumination device of Comparative Example 4, instead of the phosphor sheet 21 having a thickness of 0.5 mm provided in the light emitting module 2, a green phosphor G having a main wavelength of 520 nm, a red phosphor R having a main wavelength of 650 nm, and A phosphor sheet in which three types of phosphors of yellow phosphor Y2 having a dominant wavelength of 565 nm were mixed was used. The blending ratio of these three phosphors is as shown in FIG.

  The color temperature of light passing through the phosphor sheet used in Comparative Example 4 was 2974K, its duv was -0.0010, and Ra was 90. And this comparative example 4 was made into the standard (efficiency 100%) of the efficiency evaluation of Examples 7 and 8.

  In the illuminating device of Example 7 having the same configuration as that of Example 3, the phosphor sheet 21 having a thickness of 0.5 mm provided in the light emitting module 2 includes a red phosphor region in which a red phosphor R having a dominant wavelength of 650 nm is included ( That is, the first phosphor region 21a, the third phosphor region 21c, and the fifth phosphor region 21e), the green phosphor G having a dominant wavelength of 520 nm, and the yellow phosphor Y2 having a dominant wavelength of 565 nm are mixed. Fluorescence having a configuration in which non-red phosphor regions (that is, second phosphor region 21b, fourth phosphor region 21d, and sixth phosphor region 21f) that are completely dispersed in a state are divided and provided alternately A body sheet 21 was used. The mixing ratio of these two phosphors is as shown in FIG.

  In the illuminating device of Example 7, the color temperature of the light that passed through the phosphor sheet 21 was 3002 K, the duv was −0.0015, and Ra was 91. And the efficiency of the light taken out through the phosphor sheet 21 was 112% with respect to Comparative Example 4.

  In the illuminating device of Example 8 having the same configuration as that of Example 4, the phosphor sheet 21 having a thickness of 0.5 mm included in the light-emitting module 2 described above includes a red phosphor having a main wavelength of 650 nm. Region (that is, first phosphor region 21a and fourth phosphor region 21d) and non-red phosphor region (that is, second phosphor region) in which yellow phosphor Y2 having a dominant wavelength of 565 nm is completely dispersed. 21b and the fifth phosphor region 21e) and the non-red phosphor region in which the green phosphor G having the dominant wavelength of 520 nm is completely dispersed (that is, the third phosphor region 21c and the sixth phosphor region 21f). A phosphor sheet 21 having a configuration in which the two are alternately arranged is used. The blending ratio of these three phosphors is as shown in FIG.

  In the illuminating device of Example 8, the color temperature of the light that passed through the phosphor sheet 21 was 3002 K, the duv was −0.0015, and Ra was 90. And the efficiency of the light taken out through the phosphor sheet 21 was 113% with respect to Comparative Example 4.

  The spectral characteristics of Examples 7 and 8 having the same color temperature and Ra in the above results are as shown in FIG. 8C, and the color rendering properties are achieved by using the red phosphor R and the green phosphor G. Improved. From the above comparison, it was confirmed that Examples 7 and 8 can improve efficiency over Comparative Example 4 when illumination is performed with illumination light having Ra of 90 at a color temperature of 3000K. Further, in order to obtain this characteristic, the amount of phosphors other than the red phosphors can be reduced as can be seen from the comparison of the blending ratios of the phosphors in FIG.

  10 and 11 show a second embodiment of the present invention. Since the second embodiment is an example implemented in a lighting fixture provided with a cup-type light emitting module, in the following description, the same reference numerals as those in the first embodiment are assigned to components having the same functions and the like as those in the first embodiment. The description is omitted.

  10 and 11 includes a module substrate (device substrate) 3, three pairs of electrodes 5, 6, 7, 8, 9, 10 and three systems of LEDs (semiconductor light emitting elements) 12 to 14, a frame member 17, a sealing member 19, and a phosphor sheet 21.

  As shown in FIG. 11, the shape of the module substrate 3 viewed from the front is, for example, a substantially square shape. As representatively shown by the electrodes 5 and 6, the electrodes 5 to 10 are mounted from the front surface to the back surface of the module substrate 3. The ends of the electrodes 5 to 10 arranged around the back surface of the module substrate 3 are used as external terminals and are electrically connected to a lighting device not shown in FIGS. 10 and 11. The ends of the electrodes 6, 8, and 10 disposed so as to reach the center of the front surface of the module substrate 3 are stacked on each other, but they are not shown and are interposed between each other. It is electrically insulated by the layer.

  As the LEDs 12 to 14, chip-shaped double-wire LEDs that emit blue light having a dominant wavelength of, for example, 650 nm are used. These LEDs 12 to 14 are arranged around the center of the module substrate 3 at intervals of 120 degrees and are fixed by a die bond material 15. Each of the LEDs 12 to 14 is connected in series to a pair of electrodes by a bonding wire 16 shown in FIG. Specifically, the LED 12 is connected to the electrodes 5 and 6 in series, the LED 13 is connected to the electrodes 7 and 8 in series, and the LED 14 is connected to the electrodes 9 and 10 in series.

  The frame member 17 is made of a white synthetic resin and has the same size as the module substrate 3 and has a truncated cone-shaped accommodation portion. The frame member 17 accommodates the LEDs 12 to 14 in its housing portion and is fixed to the surface of the module substrate 3 with an adhesive. The housing part of the frame member 17 is filled with a sealing member 19 that seals the LEDs 12 to 14 and the like.

  The phosphor sheet 21 is provided in contact with the surface of the sealing member 19 and the surface of the frame member 17 flush with the sealing member 19. The phosphor sheet 21 is divided into a first region 23 to a third region 25 by a three-pronged partition plate 22b provided between the frame portions 22a of the partition member 22.

  The first region 23 is mainly excited by light emitted from the LEDs 12 arranged in a region where the first region 23 is projected onto the module substrate 3 when viewed from the phosphor sheet 21 side toward the module substrate 3. The red phosphor that emits red light having a wavelength of, for example, 650 nm is preferably formed of a red phosphor region that is contained in a completely dispersed manner. The second region 24 is mainly excited by light emitted from the LEDs 13 arranged in the region where the second region 24 is projected onto the module substrate 3 when viewed from the phosphor sheet 21 side toward the module substrate 3. The yellow phosphor that emits yellow light having a wavelength of, for example, 540 nm is preferably formed of a yellow phosphor region that is preferably completely dispersed, that is, a first non-red phosphor region. The third region 25 is mainly excited by light emitted from the LED 14 arranged in the region where the third region 25 is projected onto the module substrate 3 when viewed from the phosphor sheet 21 side in the direction of the module substrate 3. The yellow phosphor that emits yellow light having a wavelength of, for example, 565 nm is preferably formed of another yellow phosphor region that is contained in a completely dispersed state, that is, a second non-red phosphor region.

  Except for the matters described above, the lighting device is the same as that of the first embodiment. Therefore, also in the lighting device of the second embodiment, for the same reason as described in the first embodiment, the color rendering can be improved and the decrease in efficiency can be suppressed, and at least one of the LEDs 12 to 14 is selected. The color temperature of the illumination light can be changed by turning on the light.

  In the second embodiment, the third region 25 includes a green phosphor that emits green light having a dominant wavelength of, for example, 520 nm when excited by the light emitted from the LED 14, and is preferably completely dispersed. Ra can be further improved by forming the other green phosphor region, that is, the second non-red phosphor region. In this case, the yellow phosphor dispersed and contained in the second region 24 forming the first non-red phosphor region may be at least one of the yellow phosphors having a dominant wavelength of 540 nm or 565 nm.

  Furthermore, the number of LEDs 12 to 14 used in the second embodiment may be plural. Moreover, it is possible to use semiconductor light emitting elements, such as LED which emits an ultraviolet-ray instead of what emits blue light, for LED12-14 in 2nd Embodiment. In this case, the first region 23 is a red phosphor region, the second region 24 is a first non-red phosphor region composed of a green phosphor region, and the third region 25 is emitted by the LED 14. For example, a blue phosphor that emits blue light having a dominant wavelength of, for example, 650 nm when excited by ultraviolet rays is preferably a second non-red phosphor region including a blue phosphor region that is completely dispersed.

  12 and 13 show a third embodiment of the present invention. In the description of the third embodiment, components having the same functions and the like as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted.

  In the third embodiment, the light emitting module 2 includes a module substrate (device substrate) 3, a plurality of semiconductor light emitting elements that emit blue light, for example, LEDs 11 a to 11 e, a translucent sealing member 19, and printing. The phosphor layer 121 is provided. The phosphor layer 121 has a first phosphor region 121a to a sixth phosphor region 121f.

  The phosphor layer 121 has a first phosphor region 121 a to a sixth phosphor region 121 f, and these regions are printed on the surface to be printed, for example, the surface of the sealing member 19. As representatively shown in FIG. 13B, the first phosphor region 121a, the third phosphor region 121c, and the fifth phosphor region 121e are base materials that form a translucent phosphor-containing layer. The coating material in which the red phosphor R is dispersed and contained in the material to be Sa is provided by printing on the surface of the sealing member 19 by printing, for example, screen printing. Therefore, these phosphor regions 121a, 121c, and 121e correspond to the red phosphor regions 21a, 21c, and 21e (see FIG. 1) described in the first embodiment.

  The surfaces of the first phosphor region 121a, the third phosphor region 121c, and the fifth phosphor region 121e in which the red phosphor R is dispersed and contained are the light diffusion surfaces f shown in FIG. I am doing. These light diffusion surfaces f are formed by screen printing of the phosphor regions 121a, 121c, and 121e.

The table below shows the surface roughness of the phosphor regions 121a, 121c, 121e, that is, the surface roughness (centerline average roughness and ten-point average height) of the light diffusion surface f formed by screen printing, and the screen. The relationship between the mesh of a printing screen used with the printing machine which performs printing, and sieve opening is shown.

  Normally, the center line average roughness is abbreviated as “Ra”, and the ten-point average height is abbreviated as “Rz”. The centerline average roughness will be described with reference to FIG. 14. The roughness curve obtained by measuring the measurement target surface with a measuring instrument such as a laser microscope is folded back so as to be symmetric with respect to the centerline of the curve. The value obtained by dividing the area obtained by the roughness curve and the center line by the measurement length L is defined as the center line average roughness, and its unit is μm. The ten-point average height will be described with reference to FIG. 15. In the portion extracted by the reference length L from the cross-sectional curve obtained by measuring the cross-sectional shape of the measurement target surface with a measuring instrument such as a laser microscope, The value of the difference between the average value of the altitude at the top of the fifth mountain and the average value of the altitude at the bottom of the valley from the deepest to the fifth is defined as the ten-point average height, and its unit is μm.

  The center line average roughness of the light diffusion surface f is preferably 0.30 μm to 1.50 μm. The reason for the lower limit of this numerical range is that, in principle, the center line average roughness of the light diffusion surface f obtained by screen printing cannot be made smaller than the minimum particle size of the phosphor. Since the diameter is 10 μm to 20 μm, the lower limit of the centerline average roughness is set to 0.30 μm based on this. Moreover, the reason for the upper limit of the numerical range is that if the value of the center line average roughness exceeds 1.50 μm, the light extraction efficiency from the whole decreases, so in order to avoid this, the upper limit of the center line average roughness The value is set to 1.50 μm.

  The second phosphor region 121b, the fourth phosphor region 121d, and the sixth phosphor region 121f of the phosphor layer 121 include a light-transmitting phosphor as shown in FIG. 13B. It is provided by printing on the surface of the sealing member 19 by printing, for example, screen printing, in which at least one of the yellow phosphors Y1 or Y2 is dispersed in the material that is the base material Sa of the layer. Yes. Therefore, these phosphor regions 121b, 121d, and 121f form non-red phosphor regions corresponding to the non-red phosphor regions 21b, 21d, and 21f (see FIG. 1) described in the first embodiment. Note that the surfaces of the phosphor regions 121b, 121d, and 121f in which at least one of the yellow phosphors Y1 and Y2 is dispersedly included are not light diffusion surfaces in the present embodiment, but the red phosphor R Can be formed as a light diffusion surface f similar to the surfaces of the phosphor regions 121a, 121c, and 121e.

  The phosphor regions 121a, 121c, 121e forming the red phosphor region and the phosphor regions 121b, 121d, 121f forming the non-red phosphor region are in contact with each other as shown in FIGS. 12 and 13A. In an adjacent state and arranged alternately.

  Except for the matters described above, the lighting device is the same as that of the first embodiment. Therefore, also in the illumination device of the third embodiment, for the same reason as described in the first embodiment, the color rendering can be improved and the decrease in efficiency can be suppressed. Moreover, the group of LEDs 11a, 11c, and 11e and the LED 11b. , 11d, and 11f can be selected and turned on to change the color temperature of the illumination light.

  Furthermore, in the third embodiment, since the phosphor layer 121 is formed by printing, there is no need to stick it as compared with the phosphor sheet, and thus the mass productivity is excellent. Furthermore, in the third embodiment, as at least the red phosphor regions 121a, 121c, 121e of the phosphor layer 121 are printed, for example, the light diffusion surface f can be formed on the surface thereof, so that the light diffusion surface f is obtained. It is also excellent in mass productivity in that no special processing is required. As can be seen from the above table, the surface roughness of the light diffusing surface can be easily obtained according to the size of the mesh of the printing screen and the size of the sieve openings provided in the screen printer. .

  Since the red phosphor regions 121a, 121c, and 121e have the light diffusion surface f, red light emitted from the red phosphor regions 121a, 121c, and 121e is diffused by the light diffusion surface f. For this reason, when the illuminating device is visually recognized, it can suppress that the red light-emitting body area | regions 121a, 121c, and 121e are visually recognized.

  Moreover, since the red light diffused by the light diffusion surface f is mixed with the white light emitted from the non-red light emitter regions 121b, 121d, 121f adjacent to the red light emitter regions 121a, 121c, 121e, Color unevenness on the irradiated surface can be suppressed. Such light color mixing depends on the surface roughness of the light diffusing surface f. The surface roughness of the light diffusing surface f depends on the mesh of the printing screen and the screen of the screen printer as described above. Since it can be arbitrarily set by adjusting the size of the opening, desired light mixing performance can be easily obtained.

  Further, as described above, the red light is diffused by the light diffusion surface f of the red light emitter regions 121a, 121c, 121e, so that the red light is diffused and the red light emitter regions 121a, 121c, 121e are non-red light emitting. As a configuration for mixing the light emitted from the body regions 121b, 121d, and 121f, it is not necessary to dispose a light diffusion member such as a diffusion plate on the light emission side. Using a diffuser plate not only increases the number of parts, but in addition to the light propagating within the thickness of the diffuser plate leaking from the peripheral surface of the diffuser plate, the light transmittance of the diffuser plate is not 100%. It is inevitable that the brightness decreases due to the loss of light. However, such a problem can be solved by the illumination device of the third embodiment that does not use a diffusion plate. Further, as described above, the illumination device of the third embodiment is configured to mix the light emitted from the red light emitter regions 121a, 121c, and 121e and the non-red light emitter regions 121b, 121d, and 121f. This is preferable because it is not necessary to secure a long distance on the emission side.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic explaining the illuminating device which concerns on Example 1 of 1st Embodiment of this invention. Schematic explaining the illuminating device which concerns on Example 2 of 1st Embodiment of this invention. (A) is sectional drawing of the light emitting module shown along F3-F3 line in FIG. FIG. 3B is a schematic cross-sectional view showing an enlarged part of the phosphor sheet included in the light emitting module of FIG. (A) is sectional drawing of the light emitting module shown along F4-F4 line in FIG. FIG. 4B is a schematic cross-sectional view showing an enlarged part of the phosphor sheet included in the light emitting module of FIG. Sectional drawing equivalent to FIG. 3 (A) which shows the light emitting module of the illuminating device which concerns on Example 3 of 1st Embodiment of this invention. FIG. 5B is a schematic cross-sectional view showing an enlarged part of the phosphor sheet included in the light emitting module of FIG. Sectional drawing equivalent to FIG. 4 (A) which shows the light emitting module of the illuminating device which concerns on Example 4 of 1st Embodiment of this invention. FIG. 7B is a schematic cross-sectional view showing an enlarged part of the phosphor sheet included in the light emitting module of FIG. (A) is a figure which shows the efficiency, color temperature, duv, and Ra of Examples 1-4 of this invention, and Comparative Examples 1 and 2. FIG. (B) is a figure which shows the spectral distribution of Example 1, 2 of this invention. (C) is a diagram showing the spectral distribution of Examples 3 and 4 of the present invention. (A) is a figure which shows efficiency, color temperature, duv, and Ra of Examples 5-8 of this invention and Comparative Examples 3 and 4. FIG. (B) is a figure which shows the spectral distribution of Example 5, 6 of this invention. (C) is a diagram showing the spectral distribution of Examples 7 and 8 of the present invention. The figure which shows the excitation spectrum of red fluorescent substance. Sectional drawing which shows the light emitting module with which the illuminating device which concerns on 2nd Embodiment of this invention is provided. The top view which shows the light emitting module of FIG. Schematic explaining the illuminating device which concerns on 3rd Embodiment of this invention. (A) is sectional drawing of the light emitting module shown along F13-F13 line | wire in FIG. FIG. 14B is a schematic cross-sectional view showing an enlarged part of the phosphor layer included in the light emitting module of FIG. The figure for demonstrating centerline average roughness among the surface roughness of a fluorescent substance layer in 3rd Embodiment. The figure for demonstrating ten-point average height within the surface roughness of a fluorescent substance layer in 3rd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Illuminating device, 2 ... Light emitting module, 3 ... Module board | substrate (device board | substrate), 11a-11f ... LED (semiconductor light emitting element), 17 ... Frame member, 18 ... Sealing member, 21 ... Phosphor sheet (phosphor layer) ), 21a to 21f ... phosphor region, 22 ... partition member, 22a ... frame portion, 22b ... partition plate, 31 ... lighting device, S ... sheet substrate (phosphor-containing layer), R ... red phosphor, Y1, Y2 ... Yellow phosphor, G ... Green phosphor, Sa ... Substrate (phosphor-containing layer), 121 ... Phosphor layer, 121a to 121f ... Phosphor region, f ... Light diffusion layer

Claims (5)

A device substrate;
A semiconductor light emitting element that emits blue light mounted on the device substrate;
A phosphor layer disposed so that light emitted from the semiconductor light-emitting element is incident, the red phosphor region including a red phosphor that is excited by the blue light and emits red light; and The phosphor layer having a non-red phosphor region that is separated from a red phosphor region and includes a different type of phosphor that is excited by the blue light and emits light of a color different from red;
An illumination device comprising: A device substrate;
A semiconductor light emitting element that emits blue light mounted on the device substrate;
A phosphor layer composed of a phosphor sheet disposed so that light emitted from the semiconductor light emitting element is incident, and including red phosphor that emits red light when excited by the blue light. A phosphor layer having a body region and a non-red phosphor region that is separated from the red phosphor region and includes a different type of phosphor that is excited by the blue light and emits light of a color different from red. ;
An illumination device comprising:   The lighting device according to claim 1, wherein a sealing member made of a light-transmitting material is filled between the device substrate and the phosphor layer by filling the semiconductor light emitting element.   4. The light diffusion surface according to claim 1, wherein at least a front surface or a back surface of the red phosphor region or both surfaces of the red phosphor region and the non-red phosphor region are used as a light diffusion surface. The lighting device according to one item.   A light emitting element system corresponding to each phosphor region for each projection region in which a plurality of phosphor regions into which the phosphor layer is divided are projected onto the device substrate when viewed from the phosphor layer side toward the device substrate. The lighting device according to claim 1, further comprising: a lighting device that separately controls lighting of each light emitting element system.

Images