JP2011222712A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device which enables those with impaired color vision to recognize light.SOLUTION: A light-emitting diode 100 includes lead frames 3 and 4. A recessed part 3a is provided at the one edge of the lead frame 3. A blue LED chip 1 is bonded to the bottom of the recessed part 3a by die bonding. The LED chip 1 emits blue light having a dominant wavelength of 430-480 nm. A coating part 2 includes a red phosphor 10. A lens 6 is comprised of translucent resin such as epoxy resin and is colored by a red colorant 61. The light-emitting diode includes the lead frames 3 and 4. The recessed part 3a is provided at the one edge of the lead frame 3. A viridian LED chip is bonded to the bottom of the recessed part 3a by die bonding. The LED chip emits viridian light having a dominant wavelength of 497-502.5 nm.

Description

  The present invention relates to a light source device including a plurality of light sources, and more particularly to a light source device that can improve visibility for a color blind person.

  Conventionally, LEDs are attracting attention as light sources because of their power saving and long life compared to fluorescent lamps and incandescent lamps that have been used as light sources, and LEDs are various indicators, illumination switches, backlight light sources. It has come to be used in a wide range of electric and electronic devices such as illumination light sources and amusement device decorations.

  Such an LED can emit a required color such as blue, green, red, or white according to the application. In addition, a light emitting device capable of emitting a plurality of colors in one package is being developed.

  For example, a bullet-type LED lamp in which a chip base (bonding area) is provided at one end of a lead, a blue LED chip, a red LED chip, and a green LED chip are mounted on the chip base and each LED chip is protected with a transparent epoxy resin. It is disclosed (for example, see Patent Document 1).

JP-A-7-235624

  In the three-color LED lamp disclosed in Patent Document 1, various emission colors can be obtained by individually controlling the current flowing through each LED chip. A healthy person can recognize these various colors, but there are colors that are difficult or impossible for a color blind person to recognize.

  The majority of color blindness is the first color blindness (first color blindness) with a mutation in the gene for red vision substance or the second color blindness (second color blindness) with the mutation in the gene for green vision substance, Even if the function of either the red visual substance or the green visual substance is lost, a similar symptom that it is difficult to feel a color difference in the wavelength range of green to red is collectively called red-green color vision disorder.

  Red-green color vision impairment makes it difficult to distinguish colors with similar brightness in the green to red wavelength range (color identification of an object). In particular, in the wavelength range of light, the colors on the left and right (short wavelength side and long wavelength side) appear to be almost the same with the yellow to green wavelength range as the center, and "green and red" and "yellow green and yellow" It is difficult to distinguish and recognize the difference. For example, in an electric device or electronic device that includes a light source device having a plurality of color light sources, by changing the light source to be turned on, the operation state of the electric device or electronic device is notified or a notice is given to call attention. In this case, there was a problem that a color blind person could not recognize enough if a normal person could recognize it.

  This invention is made | formed in view of such a situation, and it aims at providing the light source device which can be recognized also by a color blind person.

  The light source device according to the first invention is a light source device comprising a plurality of light sources, wherein one light source is excited by a blue light emitting element having a dominant wavelength in the range of 430 to 480 nm and light from the blue light emitting element 640. And a red phosphor that emits light having a dominant wavelength in the range of ˜660 nm, and the other light source includes a blue-green light emitting element having a dominant wavelength in the range of 497 to 502.5 nm.

  The light source device according to a second invention is the light source device according to the first invention, wherein the chromaticity coordinates of the light emitted from the plurality of light sources are a confusion color line corresponding to 502.5 nm and a confusion color corresponding to 507.5 nm. It is outside the range surrounded by the line.

  In the light source device according to the third invention, in the first invention or the second invention, the chromaticity coordinates (x, y) of the light emitted from the one light source are (0.68, 0.32), (0.63). , 0.322), (0.694, 0.285) and (0.7, 0.3), and the chromaticity coordinates (x, y) of the light emitted from the other light source are , (0.05, 0.578), (0.05, 0.465), (0.1, 0.45) and (0.1, 0.554). And

  In the first invention, the one light source includes a blue light emitting element having a dominant wavelength in the range of 430 to 480 nm and light having a dominant wavelength in the range of 640 to 660 nm when excited by light from the blue light emitting element. A red phosphor. Another light source comprises a blue-green light emitting element having a dominant wavelength in the range of 497-502.5 nm. The relative sensitivity of a healthy person's red cone has a peak in the vicinity of a wavelength of 560 nm and decreases in a wavelength range from about 560 nm to about 700 nm. On the other hand, the relative sensitivity of the red cone of a color blind person (red-green color blind person) has a peak in the vicinity of a wavelength of 530 nm and decreases in a wavelength range from about 530 nm to about 600 nm. Since the light emitted from one light source is a red phosphor, the half-value width (for example, 610 nm to 700 nm, etc.) wider than the half-value width of the conventional red light-emitting diode can be obtained. The relative intensity of the light can be increased up to a wavelength region where the relative sensitivity of the red cone is present. In addition, since the dominant wavelength of light emitted from other light sources is in the range of 497 to 502.5 nm, it is possible to emit light at a position away from the confusion color line existing from red to green in the chromaticity diagram. . Note that the confusion color line is, for example, connected points on the CIE 1931xy chromaticity diagram where colors that the color blind person feels the same color are plotted, and colors that appear to be confused with the same color by the color blind person. It exists. The confusion color lines are those of the first color blindness (first color blindness), but may be those of the second color blindness (second color blindness). Thereby, even a color blind person can easily recognize that a plurality of light sources have different colors. Further, it is possible to realize a light source device that combines light sources that are easy to identify for persons with color blindness.

  In the second invention, the chromaticity coordinates of the light emitted from the plurality of light sources are outside the range surrounded by the confusion color line corresponding to 502.5 nm and the confusion color line corresponding to 507.5 nm in the chromaticity diagram. is there. That is, there is a 5 nm wavelength gap of confusion color lines between the chromaticity coordinates of light emitted from a plurality of light sources. Thereby, the light emitted from a plurality of light sources does not overlap on the confusion color line, and the color blind person can easily recognize that the plurality of light sources have different colors. In addition, it is possible to realize a light source device that combines light sources that are easy to identify for persons with color blindness.

  In the third invention, chromaticity coordinates (x, y) of light emitted from one light source are (0.68, 0.32), (0.63, 0.322), (0.694, 0.285) and (0.7, 0.3), and the chromaticity coordinates (x, y) of light emitted from other light sources are (0.05, 0.578), ( 0.05, 0.465), (0.1, 0.45) and (0.1, 0.554). Thereby, the light emitted from a plurality of light sources does not overlap on the confusion color line, and the color blind person can easily recognize that the plurality of light sources have different colors. Further, it is possible to realize a light source device that combines light sources that are easy to identify for persons with color blindness.

  According to the present invention, even a color blind person can easily recognize that a plurality of light sources have different colors. Further, it is possible to realize a light source device that combines light sources that are easy to identify for persons with color blindness.

It is an external appearance schematic diagram which shows the structural example of the light source device which concerns on embodiment of this invention. It is front sectional drawing which shows the structural example of the light emitting diode of this Embodiment. It is explanatory drawing which shows an example of the filter characteristic of a red colorant. It is explanatory drawing which shows an example of the emission spectrum of a light emitting diode. It is front sectional drawing which shows the structural example of the light emitting diode of this Embodiment. It is a CIE chromaticity diagram which shows the luminescent color of the light source device of this Embodiment. It is explanatory drawing which shows an example of the chromaticity coordinate of the light which the light emitting diode of the light source device of this Embodiment emits. It is explanatory drawing which shows the relative sensitivity of each cone of a healthy person. It is explanatory drawing which shows an example of the relative sensitivity of each cone of a red-green color vision handicapped person (1st color vision handicapped person). It is explanatory drawing which shows an example of the emission spectrum of the conventional red light emitting diode.

  Hereinafter, the present invention will be described with reference to the drawings illustrating embodiments thereof. FIG. 1 is a schematic external view showing a configuration example of a light source device 300 according to an embodiment of the present invention. As shown in FIG. 1, a light source device 300 has a light emitting diode 100 as one light source and 200 as another light source mounted on a circuit board 50. A power supply component (not shown) such as a constant current circuit for driving the light emitting diodes 100 and 200 may be mounted on the circuit board 50, or may be mounted on an external circuit board. In addition, the arrangement of the light emitting diodes 100 and 200 is an example, and can be changed as appropriate according to the shape or size of an electric device or an electronic device in which the light source device 300 is used. Alternatively, the light emitting diodes 100 and 200 may be mounted on different circuit boards.

  The light source device 300 includes, for example, an electric light source device, an indicator lamp, a light emitting guidance sign, an indicator (monitor) for electrical or electronic equipment, an indicator (monitor) for power distribution or control machinery, a power supply device, It can be provided in various devices such as a battery charger, a communication device, a vehicle device, and a portable device.

  FIG. 2 is a front sectional view showing a configuration example of the light emitting diode 100 according to the present embodiment. As shown in FIG. 2, the light emitting diode 100 includes lead frames 3 and 4, and a recess 3 a is provided at one end of the lead frame 3. A blue LED chip 1 as a blue light emitting element is bonded and fixed to the bottom of the recess 3a by die bonding. The LED chip 1 has a GaN-based compound semiconductor as a light emitting layer, and can emit blue light having a dominant wavelength in a range of 430 to 480 nm, for example.

  One electrode of the LED chip 1 is wire-bonded to the lead frame 3 by a wire 5, and the other electrode is wire-bonded to the lead frame 4 by a wire 5. A covering portion 2 that covers the LED chip 1 is formed in the concave portion 3a by being filled with a translucent resin. The end portions of the lead frames 3 and 4 on which the covering portion 2 is formed are housed in a lens 6 having a tip portion that is convex. The lens 6 is formed of a translucent resin such as an epoxy resin, and the entire lens 6 is colored with a red colorant 61. The lens 6 may be partly colored with the red colorant 61, or the red colorant 61 may not be used. Moreover, the color of the colorant may be the same color as the color of light emitted from the red phosphor 10 described later. Here, the same color includes not only the same color but also a color with similar hues.

The covering portion 2 contains a red phosphor 10 that is excited by blue light emitted from the LED chip 1 and emits red light having a dominant wavelength in the range of 640 to 660 nm. The concentration of the red phosphor 10 is, for example, 25%. The red phosphor 10 is formed, for example, by firing a mixture made of calcium sulfide (CaS) and europium sulfide (EuS). In this case, the molar ratio of europium sulfide (EuS) can be in the range of about 0.01 to 10, for example, where the total of calcium sulfide (CaS) and europium sulfide (EuS) is 100. Alternatively, an oxynitride phosphor can be used as the red phosphor 10. For example, Eu ²⁺ is activated to an inorganic compound having the same crystal structure as α-Si ₃ N ₄ and represented by the general formula α. Here, the general formula α is α: M (Si, Al) ₁₂ (O, N) ₁₆ , and M is Li, Mg, Ca, Sr, Y, or a lanthanoid element. Alternatively, XAlSiN ₃ (X is Li, Mg, Ca, Sr, Y, or a lanthanoid element) that is obtained by activating Eu ²⁺ on an inorganic compound can be used as the red phosphor 10.

  As the red colorant 61, a known dye can be used. For example, C.I. I. Acid Red 118, or C.I. I. Acid Red 35 + C. I. Acid dyes such as Acid Yellow 23 to which water and alcohols are added can be used. Here, C.I. I. Is a color index.

  Examples of the red colorant 61 include ranacin red S-2GL (manufactured by Santos), irganol red BL (manufactured by Ciba Geigy), kayanol milling red RS, kayak lance scarlet GL (manufactured by Nippon Kayaku), and suminol. Level binol 3GP (manufactured by Sumitomo Chemical) or the like can also be used.

  The ratio of the red colorant 61 is, for example, 1.0% of the weight of the epoxy resin of the lens 6. In addition, the ratio of the red colorant 61 can be contained about 0.2% to 1.2% of the weight of the epoxy resin of the lens 6. Further, the ratio of the red colorant 61 is not limited to about 0.2% to 1.2%, and can be adjusted according to a required chromaticity range and the concentration of the red phosphor 10.

  With the above-described configuration, in the light emitting diode 100, the blue light from the LED chip 1 and the red light from the red phosphor 10 pass through the lens 6 and are emitted to the outside.

  FIG. 3 is an explanatory diagram showing an example of the filter characteristics of the red colorant 61. In FIG. 3, the horizontal axis represents the wavelength, and the vertical axis represents the transmittance. The transmittance of the red colorant 61 rises from around 550 nm. That is, when the wavelength is shorter than around 550 nm, light transmission is blocked. When the wavelength is longer than about 550 nm, the light transmittance is close to 100%, and the amount of light is not attenuated.

  FIG. 4 is an explanatory diagram showing an example of an emission spectrum of the light emitting diode 100. In FIG. 4, the horizontal axis represents wavelength, and the vertical axis represents relative intensity. The light emitting diode 100 emits blue light having an emission peak in a wavelength range of 430 to 480 nm and red light having a dominant wavelength in a range of 640 to 660 nm. Since the red light emitted from the light emitting diode 100 is emitted by the red phosphor 10, it has a half-value width wider than that of the conventional red light-emitting diode. In the example of FIG. 4, the half width is about 90 nm. The half-value width is a width of two wavelengths whose relative intensity is half (50%) with respect to the peak value. In the example of FIG. 4, the wavelengths at which the relative intensity of the emission spectrum is halved are approximately 610 nm and approximately 700 nm, and the half-value width is approximately 90 nm (700-610).

  When the lens 6 is colored red, the relative light emission intensity of the red light peak is 1 and the blue light peak relative light emission intensity is about 0.05. This is because blue light (wavelength: 430 to 480 nm) is blocked by the filter characteristics of the red colorant 61 shown in the example of FIG. In addition, the ratio of the relative intensity of red light and blue light is not limited to the example of FIG. For example, when the red colorant 61 is not used, the attenuation of blue light is suppressed, so that the relative emission intensity of the red light peak is 1 and the relative emission intensity of the blue light peak is about 0.2. be able to. Thereby, the chromaticity range of the color which the light emitting diode 100 emits can be adjusted.

  FIG. 5 is a front sectional view showing a configuration example of the light emitting diode 200 according to the present embodiment. As shown in FIG. 5, the light emitting diode 200 includes lead frames 3 and 4, and a recess 3 a is provided at one end of the lead frame 3. A blue-green LED chip 21 as a blue-green light emitting element is bonded and fixed to the bottom of the recess 3a by die bonding. The LED chip 21 has a GaN-based compound semiconductor as a light emitting layer, and can emit blue-green light having a dominant wavelength in the range of 497 to 502.5 nm, for example.

  One electrode of the LED chip 21 is wire-bonded to the lead frame 3 by the wire 5, and the other electrode is wire-bonded to the lead frame 4 by the wire 5. The recess 3a is filled with a translucent resin to form a cover 22 that covers the LED chip 21. The end portions of the lead frames 3 and 4 on which the covering portion 22 is formed are accommodated in a lens 26 having a tip portion that is convex. The lens 26 is formed of a translucent resin such as an epoxy resin. In addition, the coating | coated part 22 does not contain fluorescent substance, and the lens 26 also does not contain a coloring agent.

  As described above, the light source device 300 includes the light emitting diodes 100 and 200. The light emitting diode 100 includes a blue LED chip 1 having a dominant wavelength in the range of 430 to 480 nm, a red phosphor 10 that emits light having a dominant wavelength in the range of 640 to 660 nm when excited by light from the LED chip 1, red A colorant 61 and the like are provided. The light emitting diode 200 includes a blue-green LED chip 21 having a dominant wavelength in the range of 497 to 502.5 nm.

  The relative sensitivity of a healthy person's red cone has a peak in the vicinity of a wavelength of 560 nm and decreases in a wavelength range from about 560 nm to about 700 nm. On the other hand, the relative sensitivity of the red cone of a color blind person (red-green color blind person) has a peak in the vicinity of a wavelength of 530 nm and decreases in a wavelength range from about 530 nm to about 600 nm. Since the light emitted from the light emitting diode 100 is generated by the red phosphor 10, the half width (for example, 610 nm to 700 nm) wider than that of the conventional red light emitting diode can be obtained. The relative intensity of the light can be increased up to a wavelength region where the relative sensitivity of the red cone is present. Further, since the dominant wavelength of the light emitted from the light emitting diode 200 is in the range of 497 to 502.5 nm, it is possible to emit light at a position away from the confusion color line existing from red to green in the chromaticity diagram. . Note that the confusion color line is, for example, connected points on the CIE 1931xy chromaticity diagram where colors that the color blind person feels the same color are plotted, and colors that appear to be confused with the same color by the color blind person. It exists. Thereby, even a color blind person can easily recognize that a plurality of light sources have different colors. Further, it is possible to realize a light source device that combines light sources that are easy to identify for persons with color blindness.

  FIG. 6 is a CIE chromaticity diagram showing the emission color of the light source device 300 of the present embodiment. As shown in FIG. 6, the light emission color of the light source device 300 can be specified by color coordinates (x, y). That is, in FIG. 6, a trapezoidal area A (area with a pattern in the figure) is the chromaticity range of the light emitting diode 100. A trapezoidal region B (region with a pattern in the figure) is the chromaticity range of the light emitting diode 200.

  In FIG. 6, a straight line L1 indicated by a broken line is a confusion color line corresponding to a wavelength of 502.5 nm, and a straight line L2 indicated by a broken line is a confusion color line corresponding to a wavelength of 507.5 nm. The confusion color line shown in FIG. 6 is an example of the confusion line of the first color blindness (first color blindness). The first color blindness (first color blindness) is a mutation in the gene for red vision material. FIG. 6 is a plot of colors that the first color blind person feels the same color on the CIE1931xy chromaticity diagram. What connected the plotted points is a confusing color line in which there are colors that appear to be confused with the same color by color blind people.

  Many confused color lines can be drawn on the xy chromaticity diagram. That is, the confusion color line exists almost parallel to the red and green axes and is distributed radially. In the case of the first color blindness (first color blindness), there is a point where each confusion color line intersects near red light. In the xy chromaticity diagram, it is located on or near the confusion color line, so it is difficult for color blind people (first color blindness, second color blindness) to recognize different colors because they all look the same color. Met.

  In the light source device 300 of the present embodiment, the chromaticity coordinates of the light emitted from the light emitting diodes 100 and 200 are the confusion color line corresponding to 502.5 nm and the confusion corresponding to 507.5 nm in the CIE1931xy chromaticity diagram. It is outside the range surrounded by the color lines. That is, there is a 5 nm wavelength gap of the confusion color line between the chromaticity coordinates of the light emitted from the light emitting diodes 100 and 200. Thereby, the light emitted from the light emitting diodes 100 and 200 does not overlap on the confused color line, and the color blind person can easily recognize the color of the light emitted from the light emitting diodes 100 and 200 of the light source device 300 (different). It can be recognized as a color). Further, it is possible to realize a light source device that combines light sources that are easy to identify for persons with color blindness.

  FIG. 7 is an explanatory diagram illustrating an example of chromaticity coordinates of light emitted from the light emitting diodes 100 and 200 of the light source device 300 according to the present embodiment. The chromaticity coordinates of the light emitted from the light emitting diode 100 are in the trapezoidal area A in FIG. 6, and the chromaticity coordinates (x, y) are (0.68, 0.32), (0.63, 0.322), (0.694, 0.285) and (0.7, 0.3). Further, the chromaticity coordinates of the light emitted from the light emitting diode 200 are in the trapezoidal region B of FIG. 6, and the chromaticity coordinates (x, y) are (0.05, 0.578), (0. 05, 0.465), (0.1, 0.45) and (0.1, 0.554). Thereby, the light emitted from the light emitting diodes 100 and 200 does not overlap on the confusion color line, and the color blind person can easily recognize the color of the light emitted from the light emitting diodes 100 and 200 of the light source device 300. Further, it is possible to realize a light source device that combines light sources that are easy to identify for persons with color blindness.

  In addition, although the confusion color line illustrated in FIG. 6 shows the case of the first color blindness (first color blindness), Confusion color lines intersect at virtual points in the CIE 1931xy chromaticity diagram. In the CIE1931xy chromaticity diagram, the confusion color line corresponding to 502.5 nm and the confusion color line corresponding to 507.5 nm are approximated in both cases of the first color vision disorder and the second color vision disorder. Even so, the color of light emitted from the light emitting diodes 100 and 200 of the light source device 300 of the present embodiment can be easily recognized.

  FIG. 8 is an explanatory diagram showing the relative sensitivity of each cone of a healthy person. The horizontal axis indicates the wavelength of light, and the vertical axis indicates the relative sensitivity (spectral sensitivity) of each cone in terms of Log. The relative sensitivity (light-receiving spectrum) of the blue cone has a peak at around 450 nm, decreases in the wavelength region from around 450 nm to around 560 nm, decreases sharply at around 560 nm, but maintains the sensitivity up to around 640 nm. Yes. Further, the relative sensitivity of the red cone has a peak in the vicinity of the wavelength of 560 nm and decreases in the wavelength range from about 560 nm to about 700 nm. The relative sensitivity of the green cone has a peak near 540 nm and overlaps with the relative sensitivity of the red cone in a wide wavelength range, but is slightly shifted.

  In a healthy person, when light of a certain wavelength enters the eye, each of the three cones, the blue cone, the green cone, and the red cone, reacts according to the spectral sensitivity at that wavelength, and the three kinds of response degrees. The color of light can be discriminated by being different. That is, a healthy person can perceive as a different color due to the difference in the degree of reaction of each cone.

  FIG. 9 is an explanatory diagram showing an example of the relative sensitivity of each cone of a red-green color blind person (first color blind person), and FIG. 10 is an explanatory figure showing an example of the emission spectrum of a conventional red light emitting diode. It is. In FIG. 9, the horizontal axis indicates the wavelength of light, and the vertical axis indicates the relative sensitivity (spectral sensitivity) of each cone in terms of Log. In the example of FIG. 9, the relative sensitivity of the red cone is smaller than that of a healthy person, and the sensitivity is drastically decreased at a wavelength of 600 nm or more.

  On the other hand, as shown in FIG. 10, the conventional red light emitting diode has a light emission spectrum peak in the wavelength range of 620 nm to 630 nm, and the relative intensity approaches zero when the wavelength is 600 nm or less. The red color emitted from the diode cannot be recognized by a color blind person, or the red color feels dark, so that it cannot be easily recognized that the red light emitting diode is lit. In the following description, it is assumed that the color blind person is a red-green color blind person. Further, the example of FIG. 9 schematically shows the relative sensitivity of each cone of a color blind person, and is merely an example and is not limited thereto.

  As described above, the relative sensitivity of the red cone of a healthy person has a peak near the wavelength of 560 nm and decreases in the wavelength range from around 560 nm to around 700 nm. On the other hand, the relative sensitivity of the red cone of a color blind person has a peak in the vicinity of a wavelength of 530 nm and decreases in a wavelength range from about 530 nm to about 600 nm. In addition, the relative sensitivity of the blue cones of healthy and color blind persons has a peak near 450 nm, decreases in the wavelength range from about 450 nm to about 560 nm, and decreases sharply at about 560 nm, but near 640 nm. The sensitivity is kept up to.

  By setting the dominant wavelength of red (pseudo red) emitted from the light emitting diode 100 to around 640 to 660 nm and using light emitted from the red phosphor 10, as shown in FIG. 4, the half-value width is larger than that of the conventional red light emitting diode. Can be widened. Thereby, even when the relative sensitivity of the red cone of the color blind person is lower than that of the healthy person, it cannot be achieved by the conventional red light emitting diode, for example, a wide range around 550 nm to 600 nm. The relative degree of response to the red cone can be increased in a wide wavelength range.

  In addition, by including blue light having a dominant wavelength in the range of 430 to 480 nm in the light emitted from the light emitting diode 100, the light emitted from the light emitting diode 100 can be easily recognized using the sensitivity of the blue cone of the color blind person. Can do.

  In addition, since the red colorant 61 can obtain a light emission color (combination of red and blue) within the required chromaticity range while keeping the concentration of the red phosphor 10 low, the relative sensitivity of the red cone is reduced. In addition to increasing the relative degree of response to the red cone in the wavelength range, the red cone is also increased in the wavelength range where the relative sensitivity of the blue cone is reduced. Compared with the above case, the color reproducibility is improved, the red discrimination ability of the color blind person can be improved, and the red color can be recognized without any sense of incongruity for the healthy person.

  The light source device 300 according to the present embodiment uses the light emitting diodes 100 and 200, so that the color blind person can receive red light according to the relative sensitivity of the red cone (depending on the degree of color blindness). Thus, it can be recognized as pseudo-red light, and the conventional problem that it is difficult to determine whether or not the red light is turned on can be solved. Since the chromaticity coordinates of the light emitting diodes 100 and 200 do not overlap in the vicinity of the confusion color line of the color blind person, the color of the light emitting diodes 100 and 200 can be easily distinguished and recognized. It is possible to realize a light source device combining light sources that are easy to perform.

  In the above-described embodiment, the lens 6 is configured to contain a colorant in a resin such as an epoxy resin. However, the present invention is not limited to this, and the lens 6 is formed of an epoxy resin or the like. The structure which apply | coats a coloring agent to the surface, or affixes the sheet | seat containing a coloring agent may be sufficient. Moreover, the structure which does not use a coloring agent may be sufficient.

  In the above-described embodiment, the light emitting diodes 100 and 200 have a configuration including a so-called bullet-type lens and a lead frame, but the shape of the light emitting diode is not limited to this. For example, a so-called surface-mounting type in which an electrode for connecting to an external circuit is provided on a side surface of a rectangular substrate made of ceramic or glass epoxy resin, and an LED chip is mounted on the substrate, and does not have a bullet-type lens The structure of may be sufficient.

  In the above-described embodiment, the light intensity of the light emitting diodes 100 and 200 may be set as appropriate so that the color blind person can recognize the difference in brightness. The brightness may be set to the same level, and the light intensity may be set so that one of the light-emitting diodes feels bright depending on the mode of use.

50 Circuit board 100 Light-emitting diode (one light source)
1 LED chip (blue light emitting element)
6 Lens 10 Red phosphor (phosphor)
61 Red colorant 200 Light emitting diode (other light source)
21 LED chip (blue-green light emitting element)

Claims (3)

In a light source device comprising a plurality of light sources,
One light source is
A blue light emitting device having a dominant wavelength in the range of 430 to 480 nm;
A red phosphor that is excited by light from the blue light emitting element and emits light having a dominant wavelength in the range of 640 to 660 nm,
Other light sources are
A light source device comprising a blue-green light emitting element having a dominant wavelength in the range of 497 to 502.5 nm. The chromaticity coordinates of light emitted from the plurality of light sources are:
2. The light source device according to claim 1, wherein the light source device is outside a range surrounded by a confusion color line corresponding to 502.5 nm and a confusion color line corresponding to 507.5 nm in the chromaticity diagram. The chromaticity coordinates (x, y) of the light emitted from the one light source are
(0.68, 0.32), (0.63, 0.322), (0.694, 0.285) and (0.7, 0.3).
The chromaticity coordinates (x, y) of the light emitted from the other light source are
It is characterized by being in a range surrounded by (0.05, 0.578), (0.05, 0.465), (0.1, 0.45) and (0.1, 0.554). The light source device according to claim 1 or 2.

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