JP2011070010A - Condenser lens and light source unit using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple and compact condenser lens which mixes different wavelength light beams from a plurality of light-emitting diode light sources to form light of a homogeneous color tone, reduces color irregularity in viewing to such an extent that it cannot be recognized, and selectively efficiently condenses and emits the light in a desired direction; and to provide a light source unit used to irradiate an object to be irradiated in a uniform color tone by using the condenser lens. <P>SOLUTION: The condenser lens 1 is arranged on an emitting-direction side of the plurality of light-emitting diode light sources 8 arranged in series and emitting the different wavelength light beams respectively, and includes a cylindrical lens 2 provided such that its longitudinal direction is aligned with a direction C where the light-emitting diode light sources are arranged in series. The light source unit 20 is constituted by fitting and integrating the light-emitting diode light sources 8 arranged in series and emitting the different wavelength light beams in the condenser lens arranged on the emitting-direction side of the plurality of light-emitting diode light sources 8 by aligning its optical axis direction with the emitting direction while aligning the longitudinal direction of the cylindrical lens 2 with the direction C. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention mixes light of different wavelengths from a plurality of light-emitting elements, emits light in a uniform color tone, and illuminates an object to be illuminated with a uniform color tone by integrating them. It is related with the light source unit used for.

  Various lighting devices such as lighting fixtures and liquid crystal display backlights emit light of various colors by mixing the three primary colors red, green, and blue (RGB).

  As the light source, a light emitting diode (LED) is used. Such light-emitting diodes, particularly high-intensity light-emitting diodes that have been widely used recently, are much smaller than white light-emitting devices such as incandescent bulbs, halogen lamps, mercury lamps, and fluorescent lamps. Long life. For this reason, light emitting diodes are widely used as light sources for lighting devices such as backlights for liquid crystal displays, amusement lighting fixtures, automobiles and various industrial appliances, as well as general lighting fixtures such as room lights. Yes.

  Light mixed with light of different wavelengths emitted from a plurality of small, high-output light emitting diodes of about 0.1 to several mm, for example, blue light from a blue light emitting diode and a fluorescent agent-containing color filter placed on the blue light emitting diode When the light mixed with yellow light is condensed with a convex lens and illuminated in a spot manner, the distance between the light emitting diodes or the size of each light emitting diode causes the light emitting diode to surround the convex lens. There is a problem that a difference occurs in the incident angle when the light is incident on the portion, and color spots and blur appear in the vicinity of the spot.

  Conventionally, a large reflective surface surrounding a plurality of light emitting diodes that emit light of different wavelengths and a large prism or fly-eye lens installed on the emission direction side, or many of them are arranged side by side, and the optical path from the light emitting diodes By complicating the color, sufficient color mixing was performed. Therefore, it is necessary to enlarge the lighting device, and it is impossible to reduce the size of the device and the number of parts.

  In order to efficiently mix light from the light source and reduce luminance unevenness and color unevenness while downsizing, for example, in Patent Document 1, a flat part facing the light source and light from the light source provided in the flat part are scattered or A concave incident side surface into which light emitted from the light source is incident, a light guide unit through which light incident from the incident side surface passes, and the light guide unit. A lens having an exit side surface that emits light passing therethrough is disclosed.

  There is a need for a small lens that has a simpler structure, can mix light from light emitting elements that emit light of different wavelengths without color unevenness, and can collect and emit light of a uniform color tone in a desired direction.

JP 2009-192915 A

  The present invention has been made to solve the above-described problems, and can mix light of different wavelengths from a plurality of light-emitting diode light sources into a light having a uniform color tone, so that color unevenness cannot be recognized visually. A simple and compact condensing lens that can be emitted while concentrating selectively and efficiently in a desired direction, a light source unit used for illuminating an object to be illuminated in a uniform color tone, and An object is to provide an integrated lighting device.

  The condensing lens according to claim 1 of the present invention, which has been made to achieve the above object, is arranged on the side in the emission direction from a plurality of light emitting diode light sources that emit light of different wavelengths arranged in series. The cylindrical lens is provided with its longitudinal direction coinciding with the series direction.

  A condensing lens according to a second aspect of the present invention is the condensing lens according to the first aspect, wherein a tapered wing-like lens protrudes from a side surface of the cylindrical lens along the series direction.

  According to a third aspect of the present invention, there is provided the condensing lens according to the second aspect, wherein the wing-shaped lens is located on a side perpendicular to the optical axis of the light emitting diode light source or on the cylindrical lens side on the emission direction side. It has an inwardly or outwardly inclined surface, and on the light source side to the light-emitting diode light source, it is a curved surface opposite to the curved surface of the cylindrical lens or a quasi-polyhedral curved surface along the curved surface.

  According to a fourth aspect of the present invention, there is provided the condenser lens according to the first aspect, wherein the cylindrical lens has a continuous curved surface having the same curvature or a continuous curved surface including a plurality of partial surfaces having different curvatures. It is characterized by being spherical.

  A condensing lens according to a fifth aspect is the condensing lens according to the first aspect, wherein the end surface is a rough surface that diffuses and / or diffuses while being perpendicular to the longitudinal direction. .

The condensing lens according to claim 6 is the condensing lens according to claim 1, wherein the condensing lens has a total length L in the longitudinal direction and a height H from the light emitting diode light source to the top of the cylindrical lens. And the outermost width w of the light emitting diode light sources,
L ≧ 2H + w
It is characterized by the relationship.

  The light source unit according to claim 7, wherein the cylindrical lens has a longitudinal direction coincident with the series direction on the side of the emission direction from the plurality of light emitting diode light sources that emit light of different wavelengths arranged in series. The light-emitting diode light source is fitted and integrated with a condensing lens arranged so that the optical axis direction coincides with the emission direction.

  The light source unit according to an eighth aspect is the light source unit according to the seventh aspect, wherein the light emitting diode light source is fitted to the condenser lens without an air layer interposed therebetween.

  The light source unit according to claim 9 is the light source unit according to claim 7, wherein the distance D to the irradiated object to be irradiated is at least 30 times the outermost width w of the plurality of light emitting diode light sources. It is characterized by.

  In the illumination device according to claim 10, the light source unit according to claim 7 is connected to the substrate as a single unit, or a plurality of the light source units are arranged continuously or dotted in a single row or a plurality of rows. And connected to the substrate.

  The condensing lens of the present invention is selective in a desired direction to the object to be irradiated by mixing light of different wavelengths with red, green, blue, or an intermediate color emitted from a plurality of light emitting diodes. It is possible to emit light while condensing efficiently. This condensing lens does not emit light of the original color tone derived from each light-emitting diode light source, and is reduced in size to the extent that color unevenness cannot be recognized visually while miniaturizing based on the unique shape of the condensing lens it can.

  If the wing-like lens protrudes on the side surface side of this condensing lens, light emitted from a light emitting diode at a wide angle can be efficiently condensed in a desired direction.

  Further, when the end face in the longitudinal direction of the condenser lens is roughened, the condensing lens is irregularly reflected and diffused there, thereby further preventing color unevenness.

  Since the condensing lens has a simple structure, and is small and light, it can be easily mass-produced and has a good yield.

  In the light source unit of the present invention, since the condenser lens and the plurality of light emitting diodes are integrated, the light source unit can be efficiently condensed and can be easily mass-produced.

  The illuminating device of the present invention includes one or a plurality of light source units, and uniformly illuminates an object to be irradiated without uneven color.

It is a perspective view which shows the condensing lens to which this invention is applied, and a light source unit using the same. It is the side surface and front view which show the middle of use of the condensing lens which applies this invention, and a light source unit using the same. It is a perspective view which shows another aspect of the several light emitting diode mounted in the light source unit using another condensing lens to which this invention is applied. It is a perspective view which shows the middle of use of the illuminating device with which the light source unit using the condensing lens to which this invention is applied was mounted.

  Hereinafter, although the preferable form for implementing this invention is demonstrated in detail, the scope of the present invention is not limited to these forms.

  As shown in FIG. 1, the condensing lens 1 of the present invention includes three types of LEDs that emit red light, green light, and blue light, which are arranged in series and have different wavelength lights, and a plurality of light-emitting diode light sources 8 (R ) · 8 (G) · 8 (B) are arranged on the light emitting direction side, and have a substantially semi-cylindrical so-called cylindrical lens 2.

（数式(１)中、Ｒ：曲率、ｋ：円錐係数、ａ_ｎ：非球面係数、ｚ：レンズ高さ、ｘ：レンズ横幅である）で表現する場合、
例えば曲率が１×１０^{１５〜４０}程度の値を有し、かつ円錐係数が−１×１０^{２０〜４０}程度の値を有するように形成されたものである。このような値をとることで、頂部５ａ近傍の曲率をその両脇に位置する曲面５ｂの曲率に比較して小さいものとする。このような係数以外であっても、頂部５ａ近傍の曲率を小さくできる係数の組み合わせであれば、特に制限されない。シリンドリカルレンズ２の長手方向は、複数の発光ダイオード光源８(Ｒ)・８(Ｇ)・８(Ｂ)の直列の方向Ｃと一致している。複数の発光ダイオード光源８(Ｒ)・８(Ｇ)・８(Ｂ)の直列が、シリンドリカルレンズ２の中央に位置していることが好ましい。 The cylindrical lens 2 has curved surfaces 5a and 5b on the light emission direction side. The shape forming the semi-cylindrical shape in the vicinity of the top portion 5a of the cylindrical lens 2 is not particularly limited, but the curved surface is an aspherical expression (1)

(In Formula (1), R: curvature, k: conical coefficient, _{a n:} aspheric coefficient, z: Lens Height, x: next to the lens is wide) if expressed in,
For example, it is formed so that the curvature has a value of about 1 × 10 ¹⁵ to ⁴⁰ and the cone coefficient has a value of about −1 × 10 ²⁰ to ⁴⁰ . By taking such a value, the curvature in the vicinity of the top portion 5a is made smaller than the curvature of the curved surface 5b located on both sides thereof. Even if it is other than such a coefficient, it will not be restrict | limited especially if it is a combination of the coefficient which can make the curvature of the top part 5a vicinity small. The longitudinal direction of the cylindrical lens 2 coincides with the direction C in series of the plurality of light-emitting diode light sources 8 (R), 8 (G), and 8 (B). It is preferable that the series of the plurality of light emitting diode light sources 8 (R), 8 (G), and 8 (B) is located at the center of the cylindrical lens 2.

  A tapered wing-like lens 3 projects from both side surfaces of the cylindrical lens 2 along the series direction C. The winged lens 3 is formed integrally with the curved surfaces 5a and 5b of the cylindrical lens 2 that have a substantially semi-cylindrical shape. The wing-like lens 3 has a substantially semi-cylindrical shape having a larger diameter than that of the cylindrical lens 2, so that the light from the light-emitting diode light sources 8 (R), 8 (G), and 8 (B) is projected from the cylindrical lens 2. A plane 6a perpendicular to the optical axis is formed on the emission direction side.

  The condensing lens 1 is a surface 6a of the winged lens 3 on the irradiated object 12 side and is used for allowing light rays to pass through without being refracted, so that it is perpendicular to the optical axis A of the light-emitting diode light source 8. However, the plane 6a may be slightly inclined inward or outward toward the cylindrical lens 2 side.

Curved 5a · 5b of the cylindrical lens 2, the optical axis A direction of the light emitting diode light source 8, while condensed through the inclination angle theta ₁ is 45 ° or less of the light from the optical axis A of the light emitting diode light source 8 emitting It is preferable to have the curvature adjusted so that it can do (refer FIG. 2).

On the other hand, the plane 6a of the emission direction side of the wing-like lens 3, so the inclination angle theta ₁ from the optical axis A is emitted while being diffused by transmitting light of 45 to 55 °, the light emission of the light emitting diode light sources 8 It is particularly preferable that the surface is perpendicular to the optical axis A on the direction side.

Emitting diode light source 8 side of the curved surface 6b of the wing lens 3, a light inclination angle theta ₂ from the optical axis A of the light emitting diode light source 8 is the inclination angle theta ₃ to a maximum of 55 ° to the lower limit 80 °, reflects It is preferable to have a curvature adjusted so as to be emitted from the plane 6a on the emission direction side of the winged lens 3 or the curved surfaces 5a and 5b of the cylindrical lens 2. The curvature of the curved surface 6b on the light emitting diode light source 8 side of the winged lens 3 is preferably adjusted so that the transmitted light from the light source is totally reflected, but the outer surface thereof may be covered with a metal film. As shown in the side view of FIG. 2 (i), the curved surface 6b is adjusted in a parabolic shape from the light-emitting diode light source 8, and is installed at a position where the light-emitting diode light source 8 hits the focal point of the parabola. Since the light reflected by the curved surface 6b is emitted perpendicularly from the flat surface 6a, it is preferably parallel to the optical axis A. The curved surface 6b may be a pseudo polyhedral curved surface along the curved surface.

  When the light-emitting diode light source 8 has an area of about several hundred μm to several mm square, light emitted from the light-emitting diode light source is emitted radially from various places on the light-emitting surface of the light-emitting diode light source 8, resulting in various angles. Then, the light enters the condenser lens 1. Therefore, in consideration of the size of the light-emitting diode light source 8, the shape of the condensing lens 1, in particular, the shape of the cylindrical lens 2 and the winged lens 3 and the curvature thereof are sufficiently increased, and the conical coefficient is sufficiently decreased, thereby reducing the condensing lens. It is preferable to design a curved surface close to a flat surface near the top portion 5a of one cylindrical lens 2 because light from the light source can be efficiently collected. If the condensing lens 1 has a curved surface near the top 5a of the cylindrical lens 2, the area of the light-emitting diode light source 8 is larger than the outer dimension of the condensing lens 1, and the irradiated object This is particularly effective when it is desired to concentrate light in 12 narrow ranges.

  According to the size of the light-emitting diode light source 8, the size of the range to be condensed and irradiated, and the distance to the surface of the irradiated object, the condensing lens 1 is appropriately adjusted in shape, for example, curvature, outer dimensions, It is preferable that they are individually designed.

  Both end surfaces 4 and 4 perpendicular to the longitudinal direction of the condenser lens 1 are rough surfaces roughened by, for example, sandblasting. With this rough surface, the light hitting the both end surfaces 4 and 4 from the light-emitting diode light sources 8 (R), 8 (G) and 8 (B) is diffusely reflected or scattered without being totally reflected. For this reason, even when the light is emitted from both end faces 4 and 4, color unevenness is suppressed. On the diffusion / diffuse reflection surface formed by the both end faces 4 and 4, the higher the diffusion effect, the better the color mixture, and the color unevenness is further improved. The end faces 4 and 4 are preferably perpendicular to the longitudinal direction. However, the end faces 4 and 4 become slightly closer to the top 5a of the cylindrical lens 2 as a drawing taper so as to be easily released when the condenser lens 1 is molded. It may be inclined inward.

  As shown in FIG. 2, the condensing lens 1 has a total length L in the longitudinal direction of the condensing lens 2 from the light emitting diode light sources 8 (R), 8 (G), and 8 (B) to the top of the cylindrical lens 2. It is preferable to be equal to or greater than the total of twice the height H and the outermost width w between the outermost light-emitting diode light sources 8 (R) and 8 (B) among the plurality of light-emitting diode light sources 8. . If it is less than that range, any of all three wavelength lights from the light-emitting diode light sources 8 (R), 8 (G), and 8 (B) will not be mixed, resulting in different colors. , Color unevenness is conspicuous.

  The condensing lens 1 preferably has a recess 10 that houses the light-emitting diode light sources 8 (R), 8 (G), and 8 (B). The positioning of the light-emitting diode light source 8 is performed by the depression 10. The recess 10 may be filled with an adhesive 9 that adheres the light-emitting diode light sources 8 (R), 8 (G), and 8 (B) without inserting an air layer. As the adhesive 9, a highly transparent silicone adhesive is used. By adhering without using an air layer by the adhesive 9, surface reflection by the air layer is prevented, and light quantity extraction efficiency is improved. Even when a translucent adhesive having a slightly lower transparency is used as the adhesive 9, the layer thickness of the adhesive 9 is sufficiently reduced so as not to impair the transmittance of light emitted from the light-emitting diode light source 8. May be.

  The condensing lens 1 may be chamfered (not shown), but is preferably not chamfered.

  The material of the condensing lens 1 may be an inorganic material such as glass or an organic material such as resin as long as it is a translucent transparent material exhibiting a refractive index. A transparent resin or rubber having a relatively good moldability is preferable to the inorganic material. For example, the transparent resin includes polyethylene resin, chlorinated polyethylene resin, silicone resin, epoxy resin, acrylic resin, and polycarbonate resin, and the transparent rubber includes fluorine rubber and silicone rubber.

  Since the material of the condensing lens 1 needs to be able to withstand heat from the light emitting diode light source 8 and ultraviolet rays contained in the blue component, it is more preferable to use silicone such as transparent silicone resin or transparent silicone rubber. . Such a silicone preferably has a refractive index of about 1.4 to 1.5. For example, silicone has a refractive index of about 1.52 and a hardness of about 70 degrees in Shore D code. A material having a high refractive index is more advantageous from the viewpoint of miniaturization of the lens, but a material having a refractive index of about 1.41 may be used.

  Depending on the application / location / time when the condenser lens 1 is used, a soft silicone resin or silicone rubber that can be flexibly deformed even with a slight pressure contact may be used as the material. A hard silicone resin is particularly preferable from the viewpoint of avoiding the adhesion of foreign matter and improving the certainty of detachment from the nozzle when the condenser lens 1 is sucked with the nozzle of the mounting mount and mounted on the light emitting diode light source 8. .

  If the material of the condensing lens 1 is a transparent resin or rubber, polishing like glass is not necessary, and the lens can be manufactured by injection molding or mold press molding. To contribute. Stable heat resistance against heat radiation from the light source, discoloration resistance that does not cause yellowing due to long-term transmission of high-intensity light, transparency, accuracy of mold transfer, transmittance, precise transferability during mold molding, etc. In view of the above, it is preferably a transparent silicone resin. Among them, low molecular siloxane cut products from which low molecular siloxane has been removed, such as OE-6665 and EG-6301 (trade name) manufactured by Toray Dow Corning Co., Ltd., KJR632, LPS-L400 and LPS-L500 manufactured by Shin-Etsu Chemical Co., Ltd. It is more preferable that it is a commercial item like (brand name).

  In addition, although the example provided with the winged lens 3 was shown as the condensing lens 1, it does not need to have it. Although the example in which both end surfaces 4 and 4 of the condenser lens 1 are rough surfaces has been shown, the surface treatment may not be performed and a smooth surface may be used.

  In the light source module 20 to which the present invention is applied, the condenser lens 1 and the light emitting diode light sources 8 (R), 8 (G), and 8 (B) are integrated as shown in FIGS. Is. The light-emitting diode light sources 8 (R), 8 (G), and 8 (B) may be fitted into the recesses 10 of the condenser lens 1 and fixed with a transparent adhesive 9, for example, a silicone resin adhesive.

  As the light-emitting diode light source 8, the light-emitting diode light sources 8 (R), 8 (G), and 8 (B) made up of separate LED packages that emit red, green, and blue light are shown as examples. The LED chips 8 (R), 8 (G), and 8 (B), which are the parts, are made into one LED package, and a plurality of them are arranged in series, and the series direction C and the longitudinal direction of the cylindrical lens 2 coincide with each other. It may be allowed. As shown in FIG. 3, three LED chips 8 (R), 8 (G), and 8 (B) that independently emit a plurality of wavelengths of light such as red, green, and blue are encapsulated in series. A plurality of LED packages 8a, 8b,... May be arranged in the same direction as the series direction C, and the longitudinal direction of the cylindrical lens 2 may be matched. Only one LED package 8 a may be disposed, and the series direction C of the LED chips 8 (R), 8 (G), and 8 (B) may be aligned with the longitudinal direction of the cylindrical lens 2. As the LED chips or LED packages 8 (R), 8 (G), and 8 (B) that emit light having a plurality of wavelengths are arranged with only a small distance from each other, the color mixture becomes better. In other words, the irradiated object 12 at a short distance can be illuminated.

  The light source unit 20 has a distance D to the irradiated object 12 to be irradiated, the light emitting diode light sources 8 (R) and 8 (B), which are the farthest among the plurality of light emitting diode light sources 8, in the longitudinal direction. It is necessary to adjust in advance so as to be at least 30 times the space between the outermost spaces w. If it is less than this range, any of all three wavelength lights from the light-emitting diode light sources 8 (R), 8 (G), and 8 (B) are irradiated with different colors without being mixed. The range of color unevenness becomes relatively large and becomes conspicuous.

  As shown in FIG. 4, the lighting device 30 to which the present invention is applied includes a plurality of light source units 20 arranged in a straight line, and leads derived from the light emitting diode light sources 8 (R), 8 (G), and 8 (B). The line 11 is connected to the wiring 32 on the substrate 31.

  The light source units 20 may be arranged in rows in an arc shape, or a plurality of rows arranged in a straight line may be arranged in an orderly manner vertically and horizontally. Also, it may be scattered radially, may be arranged in an arc with the longitudinal direction directed to one point, may be arranged in a mixture of vertical and horizontal orientations, or randomly scattered Also good.

  The lighting device 30 may use a single light source unit 20, and the lead wire 11 of the light emitting diode light source 8 may be connected to the wiring 32 on the substrate 31.

  In addition, although the example of what emits the light of three colors of RGB as the light emitting diode light source 8 was shown, if it is mixed, there will be no restriction | limiting in particular and the color tone of the light emitted from the light emitting diode light source 8 will not be limited. For example, a blue color mixture of blue colors, a color mixture consisting of a combination of two colors of R, G and B, or a phosphor layer provided on the LED, and a light-emitting diode light source converted in wavelength may be mixed. Good. Further, after the light emitting diode light source is formed through the color filter, the colors may be mixed. Alternatively, 3 to 6 white LEDs may be arranged in series, and the condensing lens 1 may be covered to mix the color with uniform white light. Moreover, you may color-mix the light-emitting-diode light source 8 containing the diffusing material inside LED.

  The illumination device 30 on which the light source unit 20 using the condenser lens 1 is mounted is manufactured as follows. First, a mold which is depressed corresponding to the shape of the condenser lens 1 as shown in FIG. 1 is produced. Of the concave surface of the mold, a portion corresponding to the end surface 4 of the condenser lens 1 is roughened by, for example, electric discharge machining. A condensing lens 1 is obtained by pouring a composition containing a silicone resin raw material capable of precisely transferring the rough surface state into a mold and curing the composition. Next, as shown in FIG. 2, the light emitting elements 8 (R), 8 (G), and 8 (B), which are light emitting diodes, are inserted into the recesses 10 (see FIG. 2) of the condenser lens 1, and transparent adhesive When airtightly sealed at 9, the light source unit 20 is obtained. Thereafter, as shown in FIG. 4, a plurality of light source units 20 are arranged linearly on the base material 31, and the lead wires 11 extending from the light emitting diode light source 8 are connected to the wiring 32 on the base material 31. When soldered, the lighting device 30 is obtained.

This illumination device 30 is used as follows. When the wiring 32 is energized and applied, the light emitting diode light sources 8 (R), 8 (G), and 8 (B) emit light. Representative optical paths of the emitted light are indicated by P _{1 to} P ₈ in FIG.

As shown in the side view of FIG. (I), the light P ₄ traveling along a somewhat inclined from the optical axis A from the light emitting element 8, through the interior of the condenser lens 1, a cylindrical lens 2 on the curved surface The light is refracted somewhat at the top portion 5 a, exits there, and reaches the irradiation object 12. The light P ₃ that is slightly inclined with respect to the light P ₄ is further refracted by the curved surface 5 b on the side surface of the cylindrical lens 2 through the inside of the condenser lens 1, is emitted therefrom, and is substantially parallel to the light P _4. And reaches the object 12 to be irradiated. The light P ₂ tilted with respect to the light P ₃ reaches the plane 6 a on the emission direction side of the winged lens 3 at an obtuse angle, and is totally reflected there, reaches the curved surface 6 b on the light source side, and refracts and exits downward from the winged lens 3. To do. The light P ₁ tilted from the light P ₂ is totally reflected by the curved surface 6 b of the winged lens 3 through the inside of the condenser lens 1, is emitted from the flat surface 6 a of the winged lens 3, and becomes parallel to the light P _4. To the irradiated object 12.

Also as shown in the front view of FIG. (Ii), the light emitting diode light sources 8 (R) from light P ₇ traveling vertically passes through the interior of the condenser lens 1, at the top 5a of the curved cylindrical lens 2, refracted Without going straight, it goes out from there and reaches the object 12 to be irradiated. The light P ₆ inclined slightly than the light P ₇ passes through the interior of the condenser lens 1, at the top 5a of the curved cylindrical lens 2, is refracted and emitted therefrom. On the other hand, the light P ₅ slightly tilted from the light P ₆ passes through the inside of the condenser lens 1, reaches the end surface 4 of the condenser lens 1, and is irregularly reflected by the end surface 4.

On the other hand, the light P ₈ tilted slightly toward the light emitting diode light source 8 (R) from the light emitting diode light source 8 (G) adjacent to the light emitting diode light source 8 (R) at the top 5 a of the curved surface of the cylindrical lens 2. Refract. In this way, light emitted from adjacent light emitting diode light sources or light emitting diode light sources further apart is mixed.

  The light emitted from each of the light emitting diode light sources 8 (R), 8 (G), and 8 (B) is in the longitudinal direction of the condenser lens 3, and the light emitting diode light sources 8 (R), 8 (G), and 8 (B ) Is also emitted from the condensing lens 1 in the same manner, so that the same refraction state or mixing state is finally taken and light is uniformly mixed and emitted from the condensing lens 1. Is done.

  In this way, most of the light emitted from the light-emitting diode light sources 8 (R), 8 (G), and 8 (B) is collected while being mixed, and the light-emitting diode light sources 8 (R) and 8 (G) are collected. The color unevenness due to the 8 (B) misregistration is sufficiently small that it cannot be visually recognized, so only the light of the mixed color tone is emitted within the visible range. As a result, the object 12 is illuminated with uniform white light.

  According to such an illuminating device 30, collective condensing with a directivity angle of about 100 ° in the longitudinal direction of the cylindrical lens 2 of the condensing lens 1 and a directivity angle of about 20 ° in a direction perpendicular to the longitudinal direction. This can be achieved, and at the same time, light of different tones can be mixed to obtain white light. Moreover, it is compact and has good light collection efficiency, contributing to energy saving.

  Hereinafter, an example in which a condenser lens 1 to which the present invention is applied, a light source unit 20 incorporating the same, and an illumination device 30 having the same will be described with reference to the drawings.

  A condenser lens 1 having the shape shown in FIG. 1 was produced. As shown in FIG. 3, a full-color LED package chip 8 a in which three RGB light-emitting diode light sources 8 (R), 8 (G), and 8 (B) are mounted in one package was used as the light-emitting diode light source 8. In the LED package chip 8a, each of the light emitting diode light sources 8 (R), 8 (G), and 8 (B) is 0.8 mm square, and is arranged in series with a gap of 0.275 mm. .

  The condensing lens 1 is designed as follows so as to have an appropriate shape. The distance between the outward ends in the longitudinal direction of the light-emitting diode light sources 8 (R) and 8 (B) farthest as shown in FIG. 2 (ii), that is, the outermost width w is 2.95 mm. The height H from the surface of the light emitting diode light source 8 (R), 8 (G), 8 (B) to the apex of the top 5 a of the cylindrical lens 2 of the condenser lens 1 is 4 mm, and the longitudinal direction of the condenser lens 1 The total length L is set to 10.95 mm or more so as to satisfy L ≧ 2H + w. The shape of the cylindrical lens 2 considers the size of each light-emitting diode light source 8 (R), 8 (G), and 8 (B), and efficiently uses light whose angle with the optical axis is within 45 °. The shape is optimized so that light can be collected well. Next, the winged lens 3 protrudes by 1 mm from both side surfaces of the cylindrical lens 2. The light source side curved surface 6b of the winged lens 3 is divided into a plurality of the corresponding angular regions from the respective centers of the light-emitting diode light sources 8 (R), 8 (G), and 8 (B), and the same according to the divided angles. A reflection angle for reflecting an angle ray parallel to the optical axis is sequentially obtained, and then each reflection angle is connected to form one curved line. Although it may be used as a lens shape as it is, each angle is smoothed by a curve by spline interpolation or the like. As a result, the light source side curved surface 6b of the winged lens 3 has a substantially parabolic shape. You may change a shape further according to a use.

  A mold corresponding to the shape of the desired condensing lens 1 designed as described above was prepared, and a silicone resin raw material was poured and cured to mold a transparent condensing lens 1 made of transparent silicone resin as designed. The condenser lens 1 has a refractive index of 1.52 and a hardness of 70 degrees with a Shore D code.

  The light-emitting diode 8 light sources (R), 8 (G), and 8 (B) are fitted into the recess 10 of the condenser lens 1 and fixed with the transparent adhesive 9, and the light-emitting diode 8 light sources (R), 8 (G), The light source unit 20 was obtained by bending the lead wires 11 respectively derived from 8 (B) in appropriate directions. A plurality of light source units 20 were arranged on a substrate 31, and lead wires were connected to the wiring pattern 11 to produce a lighting device 30.

  The condenser lens of the present invention is integrated with a light emitting diode light source that emits light of a plurality of wavelengths, and is used as a light source unit that emits light of a uniform color tone by mixing light of a plurality of wavelengths.

  Lighting devices equipped with this light source unit include indoor and outdoor interior lighting lamps, backlights for liquid crystal displays for TVs, personal computers and mobile phones, amusement lighting fixtures such as displays for portable game consoles, and headlights for automobiles. It is useful as a lighting device for various industrial lighting fixtures.

1 is a condensing lens, 2 is a cylindrical lens, 3 is a winged lens, 4 is an end surface, 5a is the top of a curved surface of the cylindrical lens, 5b is a side of the curved surface of the cylindrical lens, 6a is a flat surface of the winged lens, and 6b is a winged lens 8 · 8 (R) · 8 (G) · 8 (B) are light emitting diode light sources, 8a · 8b ··· are LED packages, 9 is adhesive, 10 is a depression, 11 is a lead wire, 20 is Light source module, 30 is an illumination device, 31 is a substrate, 32 is a wiring, A is an optical axis, C is a series direction, D is a distance to an irradiation object to be irradiated, H is a light emitting diode light source to the top of the cylindrical lens Height, L is the total length in the longitudinal direction of the condenser lens, w is the outermost width of the light-emitting diode light sources, θ _{1 to} θ ₃ are inclination angles, and P _{1 to} P ₈ are optical paths.

Claims (10)

  It is arranged on the side of the emission direction from a plurality of light emitting diode light sources that emit light of different wavelengths arranged in series, and has a cylindrical lens with its longitudinal direction coinciding with the series direction. Condensing lens characterized by   The condensing lens according to claim 1, wherein a tapered wing-like lens protrudes from a side surface of the cylindrical lens along the series direction.   The winged lens has a surface perpendicular to the optical axis of the light emitting diode light source or a surface inclined inward or outward toward the cylindrical lens on the emission direction side, and the light source side to the light emitting diode light source 3. The condensing lens according to claim 2, wherein the condensing lens is a curved surface opposite to the curved surface of the cylindrical lens or a quasi-polyhedral curved surface along the curved surface.   2. The condensing lens according to claim 1, wherein the cylindrical lens is an aspherical surface having a continuous curved surface having the same curvature or a continuous curved surface including a plurality of partial surfaces having different curvatures.   The condensing lens according to claim 1, wherein the end surface is a rough surface that diffuses and / or diffuses while being perpendicular to the longitudinal direction. The total length L in the longitudinal direction of the condensing lens, the height H from the light emitting diode light source to the top of the cylindrical lens, and the outermost width w of the plurality of light emitting diode light sources are L ≧ 2H + w
The condensing lens according to claim 1, wherein:   On the side of the emission direction from a plurality of light emitting diode light sources that emit light of different wavelengths arranged in series, the cylindrical lens makes its longitudinal direction coincide with the series direction and its optical axis direction coincides with the emission direction. A light source unit, wherein the light-emitting diode light source is fitted and integrated with a condensing lens arranged in a manner.   The light source unit according to claim 7, wherein the light emitting diode light source is fitted to the condenser lens without an air layer interposed therebetween.   The light source unit according to claim 7, wherein a distance D to an object to be irradiated is at least 30 times the outermost width w of the plurality of light emitting diode light sources.   The light source unit according to claim 7 is connected to the substrate by a single unit, or a plurality of the light source units are connected to the substrate by being arranged in a single row or a plurality of rows in a continuous or dotted manner. A lighting device.

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