JP2010205605A - Optical module, and lighting fixture for illumination - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical module capable of obtaining a desired light distribution pattern and a lighting fixture for illumination in the optical module in which an LED light source to carry out surface light emission is used, and a lens focal distance is equal or shorter against a light-emitting face size of the LED light source. <P>SOLUTION: The optical module 10 irradiates a diffusion light in which by a convex lens part 16 of the lens 12, light radiated from the origin of an LED light source has a first angle range in the direction orthogonal to the center line of both reflection parts 18, 18. Then, the reflection parts 18, 18 irradiate the diffusion light in which light radiated from the origin of the LED light source has a second angle range in the direction orthogonal to the center line of both reflection parts 18, 18, and furthermore, irradiate the diffusion light in which light radiated from the end part of the LED light source has a wider third angle range than the first angle range and the second angle range in a direction orthogonal to the center line of both reflection parts 18, 18, and form the desired semi-cut-off type light distribution pattern. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical module and an illumination lamp, and is particularly used for an illumination lamp in which an irradiation range is set such as a road illumination lamp, a street lamp, a pedestrian lamp, a parking lot lamp, an embedded lamp, or a signboard lamp. The present invention relates to an optical module and an illumination lamp.

  Lighting lamps with a high lamp height are installed outside roads and parks. Since this illumination lamp is required to illuminate a wide range, a light source with high light output such as a metal halide lamp or a fluorescent lamp is generally used as a light source for illumination.

  However, metal halide lamps and fluorescent lamps have the disadvantages of high power consumption and high maintenance costs such as bulb replacement. Recently, LED (Light Emitting Diode) light sources can be used for lighting. A light fixture has been proposed.

  Patent Document 1 discloses a road illumination lamp using an LED light source.

  This road illumination lamp includes an optical module including a surface emitting LED light source and a condenser lens, a substrate for mounting a plurality of optical modules, and a support member for supporting the substrate, and is attached to the substrate. The substrate is bent in a plurality of stages so that light from the plurality of optical modules is directed in a plurality of different directions.

  The concept regarding the light distribution of the road illumination lamp disclosed in Patent Document 1 is that a desired light distribution pattern is divided into a plurality of sections, and a plurality of optical modules are mounted on the substrate so that each section is irradiated with one optical module. This is because it was installed at a different angle.

  Moreover, as shown in FIG. 11, the irradiation performance of the road illumination lamp 100 requires irradiation with a spread that covers the lamp interval p from 3h to 3.5h when the lamp installation height is h. Therefore, it is said that the light distribution pattern is optimally a semi-cut-off light distribution pattern. This road illumination lamp 100 has a lamp installation height h = 10 m and a lamp interval p = 35 m.

  The semi-cut-off light distribution pattern in the standard of JIS Z9111 “Road Illuminance Standard” means that when the luminous intensity per 1000 lumens of the lamp has a horizontal angle of 90 °, the vertical angle is 80 °, and 120 candela. When the vertical angle is 90 °, it is 30 candela or less. When the vertical angle is 65 °, the horizontal angle ranges from 65 ° to 95 ° and is over 190 candela (however, a low-pressure sodium lamp and a fluorescent lamp) In the case of an appliance, it means a light distribution pattern having a value of 170 candela or more.

  On the other hand, in Patent Document 2, an LED is used as a light source, and light emitted from the LED light source is reflected and refracted in a direction orthogonal to the central axis of the LED light source by a lens disposed close to the LED light source. An optical module is disclosed. This optical module does not have optical directivity for obtaining a semi-cut-off light distribution pattern, and is not suitable as a road illumination lamp.

JP 2007-220572 A JP 2004-281606 A

  As described above, metal halide lamps and fluorescent lamps are widely used as light sources for illumination lamps that illuminate roads and sidewalks at night, and both are large light sources. On the other hand, since the light quantity of the light source of the LED lamp is still small, in order to make it equivalent to the bright illumination performance of the current metal halide light source lamp, a large number of optical modules composed of LED light sources and lenses that emit surface light are assembled. Therefore, it is necessary to add the amount of light.

  Therefore, if the size of the optical module is designed with priority on optical performance, the lamp size will increase when the individual optical modules are installed side by side, so a compact optical design that takes into account the balance between the optical module size and the optical performance Is required.

  For this reason, the lens has a short focal length and a compact outer shape, but this structure is a combination of lenses with a short focal length relative to the size of the light emitting surface of the LED light source. Tends to be larger than the lens. When designing with the assumption of a lens utilizing total reflection optics, the basic optical design is a lens design in which the light emitted from the origin of the LED light source is refracted in the desired irradiation angle direction, but from the LED light source far from the origin The emitted light deviates from the desired irradiation angle as the radiation angle gradually increases. Furthermore, the emitted light from the vicinity of both ends of the LED light source becomes uncontrollable because the radiation angle is further increased, and not only greatly deviates from the desired irradiation angle, but also miscellaneous light that cannot be used effectively is generated. It becomes light and the quality deteriorates. These problems can be solved if the lens size can be made larger than the light emitting surface size of the LED light source, but it is not preferable to increase the lens size because of the demand for downsizing the optical module.

  On the other hand, in the illumination lamp of Patent Document 1, when the light quantity of the LED light source increases due to technological development and the number of optical modules is to be reduced, each optical module is designated in a semi-cut-off light distribution pattern. Since the divided sections are illuminated, the sections of the reduced optical module are darkened, and there is a problem in that a missing phenomenon occurs in the semi-cut-off light distribution pattern. Such a problem can be solved if each optical module has optical directivity for obtaining a semi-cut-off light distribution pattern.

  However, in the case of an optical module in which the size of the light emitting surface of the LED light source is larger than that of the lens, the refractive angle of the convex lens is limited. Can not.

  The present invention has been made in view of such circumstances, and is an optical module using an LED light source that emits surface light, and in an optical module in which the light emitting surface size of the LED light source is larger than that of a lens, leakage of glare and the like. An object of the present invention is to provide an optical module and an illumination lamp capable of obtaining a desired light distribution pattern by effectively using light emitted from both ends of an LED light source caused by light.

  In order to achieve the above object, the present invention has a lens and a surface-emitting LED light source whose origin is substantially arranged at the focal position of the lens, and the light emitting surface end, the optical axis, and the incident surface of the LED light source. In the optical module, the lens focal length is substantially equal to the light emitting surface size of the LED light source, or the light emitting surface size is longer than the lens focal length. Is formed with a reflective portion in a predetermined region on both sides of the central axis passing through the origin of the LED light source, and a convex lens portion is formed on a region on both sides of the reflective portion. The light emitted from the origin is refracted, and the diffused light having the first angle range is irradiated in a direction perpendicular to the center line of the two reflecting parts, and the reflecting part is the light emitted from the origin of the LED light source. The total reflection and The diffused light having a second angle range is irradiated in a direction perpendicular to the center line of the two reflection portions, and the reflection portion has an acute angle radiated from an end portion of the LED light source and a high height. Bright light is totally reflected and refracted and irradiated with diffused light having a third angle range wider than the first angle range and the second angle range in a direction perpendicular to the center line of the two reflecting portions. An optical module is provided that forms a desired semi-cut-off light distribution pattern.

  According to the present invention, the light radiated from the origin of the LED light source is refracted by the convex lens portion of the lens, and the diffused light having the first angle range is irradiated in a direction perpendicular to the center line of both reflection portions. The reflection unit irradiates light emitted from the origin of the LED light source with total reflection and refraction, and diffusing light having a second angle range in a direction perpendicular to the center line of both reflection units. From the first angle range and the second angle range in a direction perpendicular to the center line of both reflection portions by the total reflection and refraction of the acute angle and high-intensity light emitted from the end of the LED light source Also irradiates diffuse light having a wide third angle range. As a result, a desired semi-cutoff light distribution pattern can be formed. Thereby, the light radiated | emitted from the both ends of the LED light source does not become uncontrollable miscellaneous light, but contributes to formation of a desired light distribution pattern. Therefore, according to the optical module of the present invention, an optical module that uses an LED light source that emits surface light, and the light source surface size of the LED light source is larger than that of the lens. A desired light distribution pattern can be obtained by effectively using light emitted from both ends of the light source.

  Moreover, it is preferable that the said reflection part of this invention is formed in the cross-sectional triangle shape while the said reflection part is formed in both right-and-left both sides with respect to the said central axis.

  Further in accordance with the present invention, the first angular range is within about 65 ° on one side, the second angular range is about 45 ° to 65 ° on one side, and the third angular range is about 65 on one side. It is preferable that it is in the range of ° to 74 °.

  When forming a semi-cut-off light distribution pattern of the current standard, the convex lens portion can emit effective light from about 0 ° on one side to about 65 ° on one side (first angle range), and about 65 ° on one side. Effective light cannot be emitted in a range of 74 ° from one side to 74 ° on one side, but effective light can be emitted from a range of about 65 ° on one side to 74 ° on one side (third angle range) by the reflecting portion. Therefore, according to the present invention, the light emitted from both ends of the LED light source can be effectively used to obtain a semi-cut-off light distribution pattern of the current standard.

  In addition, a plurality of optical modules of the present invention are disposed on a substrate, the optical modules are assembled to at least one set of lamps, and are mounted parallel to the irradiation target surface or inclined obliquely upward. Provide lighting fixtures.

  Since the optical module of the present invention has optical directivity capable of obtaining a desired light distribution pattern, it is not necessary to direct the central axis of the optical module to a section as in Patent Document 1, and an irradiation target such as a road What is necessary is just to arrange | position toward the orthogonal direction with respect to a surface. That is, according to the lighting lamp of the present invention, the lighting lamp can be configured by simply mounting a plurality of optical module substrates arranged parallel or obliquely upward with respect to the irradiation target surface. .

  Moreover, since the optical module of the present invention has an optical directivity that allows each optical module to obtain a desired light distribution pattern, the number of optical modules can be reduced as the light quantity of the LED light source increases. In this case, no omission phenomenon occurs in the light distribution pattern, and a good light distribution pattern can be obtained.

  On the other hand, the reflecting portion of the lens is preferably formed in a range of about 30 ° or more on the left and right with respect to the central axis of the LED light source. In addition, this lens can optically control the total amount of light emitted from the LED light source and emit the light from a hemispherical effective light emitting region. Further, an air layer may be provided between the LED light source and the lens, and a resin (silicon resin) having a refractive index of about 1.5 may be filled between the LED light source and the lens.

  As described above, according to the optical module and the illumination lamp of the present invention, the optical module uses a surface-emitting LED light source, and the lens focal length is equal to the light-emitting surface size of the LED light source. Alternatively, in a short optical module, a desired light distribution pattern can be obtained by effectively using light emitted from both ends of the LED light source due to leakage light such as glare.

External view of the optical module of the first embodiment Plan view of the optical module shown in FIG. 2A is a cross-sectional view of the optical module shown in FIG. 2 cut along line AA, and FIG. 2B is a cross-sectional view of the optical module shown in FIG. 2 cut along line BB. Explanatory drawing showing the Lambertian distribution, which is the light distribution directivity characteristic of the LED light source Explanatory drawing showing the light rays emitted from the origin of the LED light source and emitted from the lens Explanatory drawing which showed the irradiation direction of the light ray by the reflection part of the lens shown in FIG. Explanatory drawing which showed the light distribution directivity characteristic of the optical module shown in FIG. Explanatory drawing which showed the irradiation direction of the light ray by the reflection part of the lens of 2nd Embodiment Explanatory drawing which showed the light distribution directivity characteristic of the optical module shown in FIG. Explanatory drawing of the illuminating lamp and lamp | ramp with which multiple optical modules shown in FIG. 1 are arrange | positioned Illustration of a semi-cut-off light distribution pattern for road lighting fixtures Explanatory drawing which showed the irradiation direction of the light of the optical module which is a comparative example

  Hereinafter, preferred embodiments of an optical module and an illumination lamp according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an external view of an optical module 10 according to the first embodiment of the present invention, which is suitable for a road illumination lamp. 2 is a plan view of the optical module 10, FIG. 3A is a cross-sectional view of the optical module 10 shown in FIG. 2 cut along line AA, and FIG. 3B is an optical module shown in FIG. It is sectional drawing which cut | disconnected 10 by the BB line.

  The optical module 10 includes a lens 12 and an LED light source 14 as shown in FIGS. The LED light source 14 is a surface-emitting light source, and its origin P is substantially disposed at the focal position of the lens 12. The origin P is the upper surface position of the LED light source 14 on the central axis Z of the LED light source 14. The focal length of the lens 12 is the distance from the origin P to the lens entrance surface that is directly above the origin P. The optical module 10 has a compact outer shape with the focal length of the lens 12 as a short focal point, but is configured as an optical module in which the size of the light emitting surface 15 of the LED light source 14 is larger than that of the lens 12.

  By the way, when the road illumination lamp installed in the roadside zone that illuminates the road on which the vehicle passes is configured by the LED light source 14, the required light distribution pattern is the semi-cut-off type light distribution pattern shown in FIG. It is. Further, in order to illuminate the road surface with uniform brightness, it is necessary to weaken the directivity directly above the optical axis and to enhance the directivity in the side 60 ° direction. As shown in FIG. 4, the light distribution directivity characteristic of the LED light source 14 is a Lambertian distribution having high directivity immediately above a plane perpendicular to the road surface. In order to adjust the light distribution pattern of this Lambtian distribution to directivity corresponding to the semi-cut-off light distribution pattern shown in FIG. 11, the light distribution distribution by the lens (material: acrylic, refractive index n = 1.492) 12 It is adjusted by design.

  When the lens focal length becomes shorter than the size of the light emitting surface 15 of the LED light source 14 by the light distribution distribution design, the amount of miscellaneous light that is inevitably irradiated in an unintended direction increases. The size of the light emitting surface 15 of the LED light source 14 can be expressed as follows by the ratio to the lens focal length.

  In this case, since the focal length of the lens is longer than the size of the light emitting surface, the incident angle of the emitted light from the vicinity of the end of the light emitting surface to the lens is small. Will not occur. However, as can be seen from the Lambertian distribution of FIG. 4, the effective angle range of the emitted light from the LED light source incident on the lens is narrowed, so the light utilization rate of the LED light source is deteriorated and the amount of light irradiated is reduced. . In addition, since the focal length is long, the optical system is lengthened, and it is obvious that it is not an effective means for miniaturization.

  In addition, as the focal length becomes shorter, the apparent size of the light emitting surface 15 may be large and the ratio may be reversed.

In the optical module 110 of the comparative example shown in (A), (B), and (C) of FIG.
Light emitting surface size: Lens focal length = 4 mm: 4 mm
Both have the same dimensions.

  By forming a semi-cut-off light distribution pattern, the light distribution is designed so that the emitted light from the origin P of the LED light source 114 is directed in a desired direction (for example, 60 ° in the horizontal direction). Due to the short focal length, the light from both ends of the LED light source 114 inevitably forms an enlarged projection image including ± 15 ° of the visible light source size angle (in the direction of 15 ° left and right when aiming at 60 °). There is also a light to go). As a result, the amount of light irradiating right under the lamp in the vicinity of the 0 ° direction is too large to be dispersed, and the road surface illumination uniformity is impaired.

  Therefore, in the lens 112 of the comparative example, the reflection portions 118 and 118 using total reflection are formed on the surface of the lens 112, and the lens design is combined with the convex lens portions 116 and 116 that are refractive lenses.

  Nevertheless, the short focal length has a bad influence on the size of the light emitting surface 115, and the light emitted from the vicinity of both ends of the LED light source 114 can be effectively emitted in a controlled direction (within ± 15 ° from the target main optical axis). However, it becomes internal loss and miscellaneous light directed in the direction of 180 ° or more.

  The light distribution pattern including the light emitted from both ends of the LED light source 114 is not generated, and the light distribution pattern of the Lambertian distribution of FIG. 4 which is the general directivity characteristic of the LED light source 14 is changed to the semi-cutoff light distribution pattern of FIG. The lens to be used is the lens 12 shown in FIGS.

  In consideration of the optical module 110 of the comparative example, in the optical module 10 of the embodiment shown in FIG. 1, the lens 12 is formed in a substantially hemispherical shape as a whole, and on the surface thereof, both sides of the central axis Z of the LED light source 14 Reflective portions 18 and 18 are formed in a predetermined region, and convex lens portions 16 are formed in regions on both sides of the reflective portions 18 and 18. The convex lens portion 16 mainly refracts radiated light exceeding 30 ° left and right emitted from the origin P of the LED light source 14 and has a first angle range in a direction perpendicular to the center line of both the reflective portions 18 and 18. Light is irradiated to form part of the semi-cut-off light distribution pattern shown in FIG. The reflecting portion 18 is a second angle range in a direction perpendicular to the center line of the reflecting portions 18 and 18 by totally reflecting and refracting the radiated light of 30 ° or less left and right emitted from the origin P of the LED light source 14. In the direction perpendicular to the center line of the reflecting portions 18 and 18, the diffused light having a sharp angle is emitted from the vicinity of the end of the LED light source 14, and the high-luminance radiated light is totally reflected and refracted. Then, a semi-cutoff light distribution pattern is formed by irradiating light having a third angle range wider than the first angle range and the second angle range described above. The first to third angle ranges will be described later.

  When forming the semi-cut-off light distribution pattern of the current standard, as shown in FIG. 5, the convex lens unit 16 allows light emitted from the origin P of the LED light source 14 to be in the range of about 0 ° to about 65 ° on one side ( Effective light can be emitted up to the first angle range), and effective light cannot be emitted in a range of about 65 ° on one side to 74 ° on one side. In FIG. 5, light rays emitted from the origin P are shown, and light rays emitted up to about 80 ° on one side are shown, but the illuminance of light rays exceeding about 65 ° on one side is very high. It is low and cannot be used as effective light. In other words, the convex lens portion 16 can only obtain a light distribution pattern from about 0 ° on one side to about 65 ° on one side of the semi-cut-off light distribution pattern.

  In view of this, the light distribution patterns in the range (second angle range, third angle range) from about 45 ° on one side to 74 ° on one side are obtained by the reflectors 18 and 18, although they partially overlap.

  That is, as shown in FIGS. 6A, 6 </ b> B, and 6 </ b> C, the reflection portion 18 is formed on both the left and right sides with respect to the central axis Z and has a triangular cross section. Further, as shown in FIG. 1, the reflecting portion 18 is formed in an arc shape in the circumferential direction on the surface of the substantially hemispherical lens 12. Hereinafter, the left reflecting portion 18 in FIG. 6 will be described.

  As shown in FIG. 6 (A), one surface 18A of the pair of opposing surfaces 18A and 18B of the reflecting portion 18 is formed to be inclined at an angle of 22 ° to the left with respect to the central axis Z. The light emitted from the center of the light source 14 to the left and right at 30 ° is reflected in the direction of about 45 ° mainly on the left side with respect to the central axis Z. The angle of inclination of the reflecting portion 18 may be an angle at which the light emitted from the light emitting surface 15 from the origin P to the end portion is totally reflected when it hits the inclined surface. For this reason, since the total reflection angle of acrylic, which is the material of the lens 12, is 42 °, the inclination angle of the reflection portion 18 may be 48 ° or less, but the emitted light of 30 ° left and right from the origin P is emitted by 45 ° or more. Since it is necessary to reflect the incident light, the lower limit angle is about 20 °. It goes without saying that if the lens material is changed and the ratio of the light emitting surface size and the lens focal length is changed, the tilt angle range is changed. Further, as shown in FIG. 6B, the one surface 18A reflects the high-luminance light emitted from the left end of the LED light source 14 mainly in the direction of about 74 ° to the left with respect to the central axis Z. Since this radiated light is intense light within 30 ° from the center, it can be used as bright effective light as compared with the outgoing light of 74 ° obtained by the convex lens portion 16. On the other hand, the other surface 18B is formed to be parallel to the central axis Z or inclined to the right by a certain amount by a predetermined angle, and is emitted from the right end of the LED light source 14 as shown in FIG. The light is reflected in the direction of about 45 ° to 65 ° mainly on the right side with respect to the central axis Z. The right reflection unit 18 reflects light from the LED light source 14 in the left-right direction with respect to the left reflection unit 18.

  The light reflected by the reflecting portions 18 and 18 mainly emits light in the range of about 0 ° to about 65 ° on one side (first angle range) of the semi-cut-off light distribution pattern shown in FIG. The light emitted from the origin P of the LED light source 14 is emitted at 30 ° or more left and right, and the irradiation light in the range from about 45 ° on one side to about 65 ° on one side (second angle range) is the end of the LED light source 14. The light emitted from the vicinity is more than 30 ° left and right, and the irradiation light in the range from about 65 ° on one side to about 74 ° on one side (third angle range) is emitted from the vicinity of the end of the LED light source 14. It is formed with high-intensity synchrotron radiation of 30 ° or less on the left and right.

  Therefore, according to the optical module 10 of the first embodiment, the semi-cut-off type of the current standard can be used by effectively utilizing the acute-angled high-luminance light of 30 ° or less emitted from both ends of the LED light source 14. A light distribution pattern can be obtained. FIG. 7 shows the light distribution directivity characteristics of the optical module 10 and has a light intensity peak near 60 ° on both sides.

  FIG. 8 is a cross-sectional view of the optical module 20 of the second embodiment, and the same or similar members as those of the optical module 10 of the first embodiment shown in FIG. The description is omitted.

  The optical module 20 includes a lens 22 and an LED light source 14. The lens 22 includes a convex lens portion 16 and a reflection portion 28.

  As shown in FIGS. 8A, 8 </ b> B, and 8 </ b> C, the reflection portion 28 is formed on both the left and right sides with respect to the central axis Z, and is formed in a two-stage triangular shape that is continuous on one side. ing. Hereinafter, the left reflecting portion 28 in FIG. 8 will be described.

  This reflecting portion 28 is a point where the vertical line of the sectional triangle of the second step on one side (one closer to the central axis defines one section on one side and the far side defines the second step on one side) and the surface of the convex lens portion 16 intersect. The angle formed by the straight line passing through the origin P and the central axis Z is about 30 °. In addition, the point where the vertical surface of the cross-sectional triangle of the second step on one side and the inclined surface of the cross-sectional triangle of the first step on the one side extend, the point where the vertical surface of the cross-sectional triangle of one side two crosses and the convex lens 16 intersect, A triangle formed by connecting three points where Z intersects on the surface of the lens 22 has substantially the same shape as the reflecting portion 18 of the sectional triangle on one side of the lens 12 shown in FIG.

  As shown in FIG. 8A, the reflection unit 28 reflects light emitted from the center of the LED light source 14 mainly in the direction of about 45 ° to the left with respect to the central axis Z. Further, as shown in FIG. 8 (B), the reflecting portion 28 mainly emits the high-intensity light emitted from the left end of the LED light source 14 in the direction of about 65 ° to about 74 ° on the left side with respect to the central axis Z. reflect. And the reflection part 28 reflects the light radiated | emitted from the right end of the LED light source 14 with respect to the central axis Z mainly in the direction from about 45 degrees on the right side to about 65 degrees as shown in FIG.8 (C). The right reflection unit 28 reflects the light from the LED light source 14 in the left-right direction with respect to the left reflection unit 28.

  With the light reflected by the reflectors 28, 28, the irradiation light of about 45 ° on one side of the semi-cut-off light distribution pattern shown in FIG. 11 is mainly emitted 30 ° left and right emitted from the origin P of the LED light source 14. Irradiated light from about 45 ° on one side to about 65 ° on one side is mainly formed with the emitted light exceeding 30 ° left and right emitted from the vicinity of the end of the LED light source 14 and about 65 on one side. Irradiation light from 0 ° to about 74 ° on one side is mainly formed from high-luminance radiated light of 30 ° or less left and right emitted from the vicinity of the end of the LED light source 14.

  Therefore, according to the optical module 10 of the second embodiment, the light emitted from both ends of the LED light source 14 can be effectively used to obtain a current standard semi-cutoff light distribution pattern. Further, according to the optical module 20, when the directivity is controlled more finely than the central axis Z, the optical module 20 works effectively with little optical loss. FIG. 9 shows the light distribution directivity characteristic of the optical module 20 and has a light amount peak near 56 ° on both sides.

  In addition, in the reflection part 28 of the lens 22, if the height of the sectional triangle on the second stage on one side is approximately the same as the height of the sectional triangle on the first stage on one side, radiation from the end of the light emitting surface 15 of the LED light source 14 is achieved. When light is reflected and refracted by the first-stage cross-sectional triangle on one side and emitted in the direction of 60 ° to 74 °, there is a problem that the light is reflected by the inclined surface of the second-stage cross-sectional triangle on one side. In order to eliminate this problem, the height of the cross-sectional triangle on the second stage on one side is made lower than the height of the cross-sectional triangle on the second stage on one side, and the direction of 60 ° to 74 ° emitted from the cross-sectional triangle on the first stage on one side It is preferable to irradiate light without being blocked by the triangular shape on the second stage on one side.

  FIG. 10A shows a lamp unit 32 in which the optical modules 10,... Shown in FIG. 1 are arranged in parallel in the vertical and horizontal directions on the substrate 30.

  The lamp unit 32 is attached to the lamp umbrella 38 of the lamp body 36 of the road illumination lamp 34 shown in FIG. 10B so that the substrate 30 is parallel or inclined with respect to the road surface. If the road illuminated by the road lighting lamp 34 is a two-lane road as shown in FIG. 11, it is more efficient to illuminate the entire two-lane road by tilting the inclination angle of the lamp unit 32 upward by about 20 °. However, if the place where you want to irradiate, such as a median strip or parking lot, is located in the center, the lamp body 36 is also installed in the center of the place, so the inclination angle of the lamp unit 32 is installed parallel to the road surface. Is good. Further, since the optimum inclination angle changes depending on the number of road oblique lines, the appropriate inclination angle of the lamp unit 32 is about 0 ° to about 20 °. The lamp unit 32 has an optical directivity that allows each of the optical modules 10, 10... To obtain a semi-cutoff light distribution pattern. Even if it is reduced, the semi-cut-off light distribution pattern does not have a missing phenomenon, and a good semi-cut-off light distribution pattern can be obtained.

  In the embodiments described above, the desired light distribution pattern is described as being a semi-cutoff light distribution pattern, but the light distribution pattern is not limited to the semi-cutoff light distribution pattern.

  That is, the optical module of the present invention is characterized in that the light radiated from the origin P of the LED light source 14 is refracted by the convex lens portion 16 and the first angle range in the direction perpendicular to the center line of both the reflection portions 18 and 18. Irradiate diffused light (about 0 ° on one side to about 65 ° on one side). The reflectors 18 and 18 are configured to totally reflect and refract the light emitted from the origin P of the LED light source 14, and in the second angle range (about 45 on one side) in a direction perpendicular to the center line of both the reflectors 18 and 18. Further, the reflecting portions 18 and 18 are irradiated with diffused light having an angle of about 65 ° on one side), and the reflection portions 18 and 18 are acute angles emitted from the end of the LED light source 14 and both high-intensity light is totally reflected and refracted. Diffuse light having a third angle range (about 65 ° on one side to about 74 ° on one side) wider than the first angle range and the second angle range in a direction perpendicular to the center line of the reflectors 18, 18. Irradiate. This is to form the semi-cut-off light distribution pattern shown in FIG.

  Thereby, the light radiated | emitted from the both ends of the LED light source 14 does not become uncontrollable miscellaneous light, but contributes to formation of a desired light distribution pattern. Therefore, according to the optical module of the present invention, in an optical module using an LED light source that emits surface light and having a lens focal length equal to or shorter than the light emitting surface size with respect to the light emitting surface size of the LED light source, glare or the like A desired light distribution pattern can be obtained by effectively using light emitted from both ends of the LED light source due to the leakage light.

  In the embodiment described above, an example in which the optical module 10 is applied to a road illumination lamp has been described. However, an irradiation range such as a street lamp, a pedestrian lamp, a parking lot lamp, an embedded lamp, or a signboard lamp is set. The optical module 10 can be applied to an illumination lamp.

  DESCRIPTION OF SYMBOLS 10 ... Optical module, 12 ... Lens, 14 ... LED light source, 15 ... Light emission surface, 16 ... Convex lens part, 18 ... Reflection part, 20 ... Optical module, 22 ... Lens, 28 ... Reflection part, 30 ... Board | substrate, 32 ... Lamp Unit 34 ... Road lighting fixture 36 ... Lamp body 38 ... Lamp umbrella

Claims (4)

A lens and a surface-emitting LED light source whose origin is substantially arranged at the focal position of the lens, and the angle between the light emitting surface end of the LED light source and the intersection of the optical axis and the incident surface is large; In the optical module, the lens focal length is substantially equal to the light emitting surface size, or the light emitting surface size is longer than the lens focal length.
On the surface of the lens, a reflection portion is formed in a predetermined region on both sides of the central axis passing through the origin of the LED light source, and a convex lens portion is formed in a region on both sides of the reflection portion,
The convex lens unit refracts light emitted from the origin of the LED light source, and irradiates diffused light having a first angle range in a direction perpendicular to the center line of the two reflecting units,
The reflection unit irradiates light emitted from the origin of the LED light source with total reflection and refraction, irradiates diffuse light having a second angle range in a direction perpendicular to the center line of the both reflection units, and further reflects the reflection The acute angle radiated from the end of the LED light source and the high-brightness light are totally reflected and refracted, and the first angle range and the second angle in a direction perpendicular to the center line of the two reflective portions. An optical module characterized by irradiating diffused light having a third angle range wider than the angle range to form a desired semi-cut-off light distribution pattern.   The optical module according to claim 1, wherein the reflection portion is formed on both left and right sides with respect to the central axis and has a triangular cross section.   The first angle range is within about 65 ° on one side, the second angle range is about 45 ° to 65 ° on one side, and the third angle range is about 65 ° to 74 ° on one side. The optical module according to claim 1 or 2.   A plurality of the optical modules according to claim 1, 2, or 3 are disposed on the substrate, and the optical modules are assembled to at least one set of lamps, and are attached parallel to the irradiation target surface or inclined obliquely upward. An illumination lamp characterized by that.

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