WO2010095424A1 - Illumination device and illumination apparatus employing this illumination device - Google Patents

Abstract

Disclosed is an illumination device provided with: light sources (12) and an optical member (14) having an input face and output face for controlling the optical distribution characteristics of light emitted from these light sources (12). An input side lens surface (16) or output side lens surface (18) is formed on the input face and/or output face. The optical axes of the light sources (12) are arranged offset from the geometrical central axis of the input side lens face (16) and/or output side lens face (18) that are formed on the input side face or output side face. In this way, an illumination apparatus can be realised that has excellent design characteristics, by controlling the optical distribution characteristics in two directions simply by means of optical members, and an illumination apparatus can be provided having a high degree of horizontal surface illumination and vertical surface illumination.

Description

LIGHTING DEVICE AND LIGHTING DEVICE USING THE LIGHTING DEVICE

The present invention relates to a lighting device such as a crime prevention light, a road light, a street light, etc. having high illuminance in the horizontal plane illuminance and the vertical plane illuminance, and a lighting device used in the lighting device.

Many lighting devices such as security lights are installed outdoors for traffic safety and crime prevention. In the crime prevention light, it is desirable that (1) the outline of the face of a person 4 meters ahead can be understood as the lighting effect on crime prevention, and (2) the behavior / posture of the pedestrian 4 meters ahead can be understood. As illuminance standards for satisfying the illumination effect, (1) average horizontal plane illuminance on the road surface of 5.0 lx or higher, minimum vertical plane illuminance of 1.0 lx or higher, and (2) average horizontal illuminance on the road surface. It is specified that the value is 3.0 lx or more and the minimum vertical surface illuminance is 0.5 lx or more.

Also, with respect to lighting devices such as security lights, it is desirable to satisfy the above illuminance standards for farther distances without increasing the output of the light source. This makes it possible to save energy and reduce the number of installed lighting devices, and can efficiently perform traffic safety and crime prevention.

Generally, lighting devices such as security lights are often attached to utility poles or poles with an installation height of 4.5 m and an installation interval of about 35 m. In this case, the vertical surface illuminance at a height of 1.5 m from the road from the proximity lighting device is approximately horizontal with a vertical angle of 85 ° from the lighting device when the vertical angle of the lighting device is set to 0 °. It depends on the intensity of the direction. Since the illuminance decreases in inverse proportion to the square of the distance, it is difficult to obtain the illuminance that satisfies the above illuminance standard unless the luminous intensity in the substantially horizontal direction is increased by controlling the light distribution characteristics of the lighting device. .

There are methods described in Patent Document 1 and Patent Document 2 as techniques for controlling the light distribution characteristics of the lighting device. With respect to the illumination devices described in Patent Literature 1 and Patent Literature 2, a prism is formed on a reflective member called a reflector and a cover of the illumination device, and these are combined in a timely manner to control the light distribution characteristics and to adjust the luminous intensity in the horizontal direction. It is getting bigger.

Japanese Patent Publication “JP 2000-331504 A (published on November 30, 2000)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2004-63174 (published on Feb. 26, 2004)”

However, the conventional lighting device has the following problems.

In recent years, many lighting devices using LED light sources have been developed from the viewpoint of power saving and long life. In an illuminating device using an LED light source, a large number of LED light sources are often used side by side in order to secure an instrument light beam, and the light source area becomes large.

In this case, since the ratio of the light source area to the area of the reflector and the prism increases, light enters the reflector and the prism from various directions.

Since the reflector and the prism are set so that the light incident at a specific angle is reflected / refracted at a specific angle, it is difficult to set the shape when light is incident from various directions.

Therefore, there is a problem that it becomes difficult to control the light distribution characteristics to realize an illumination device having excellent optical characteristics. Further, in order to avoid the above problem, when the area of the reflector and the prism is increased and the ratio of the light source area is decreased, there arises a problem that the lighting device is increased in size.

Also, in a lighting device installed on a road or the like, it is important to control light distribution on two surfaces parallel to the road traveling direction and the width direction. However, the prism described in the prior art document has a shape extending in one direction, and there is a problem that only the light distribution characteristic of one surface such as a surface parallel to the road traveling direction can be controlled. is there.

In order to control the light distribution characteristics in the two directions, a reflector must be used in combination, and the number of parts increases. In addition, there is a method of using the housing of the lighting device as the reflector, but it becomes impossible to design a free housing.

In order to solve the above-described problems, an illumination device according to the present invention includes a light source such as an LED or an LD, and a transparent optical member having an incident surface and an output surface with respect to light emitted from the light source. A lens is formed on at least one of the surface and the exit surface, and the optical axis of the light source is arranged to be shifted from the geometrical central axis of at least one lens formed on the entrance surface or the exit surface. It is characterized by.

According to the above invention, since the light source and the optical axis of the lens are deviated, it is possible to control the light distribution characteristics centered on the position deviated from the optical axis direction of the light source. That is, it is possible to preferentially spread or narrow the light in a direction inclined from the optical axis direction of the light source.

As a result, the light can be efficiently spread by mounting the present lighting device on a lighting device in which the light source is arranged in a V shape or the like.

Also, in the illumination device of the present invention, the illumination device is formed by arranging a plurality of the illumination devices in an array, a plane, or the like.

According to the above-described invention, the illumination device corresponding to various uses can be realized in a compact manner.

According to the illumination device and the illumination apparatus of the present invention, it is possible to control the light distribution characteristics in the two axial directions and optimize the light distribution characteristics with only one optical member. Therefore, it is possible to realize an illuminating device excellent in design without using a reflector or the like, and to realize an illuminating device having excellent horizontal illuminance and vertical illuminance.

Further, according to the illumination device of the present invention, since the geometric center axis of the light source and the lens is shifted, the light is preferentially emitted in a direction inclined from the normal direction of the surface on which the light source is arranged. Can be widened or squeezed. As a result, it is possible to efficiently spread the light by mounting the light source on a lighting device that is tilted in a V shape or the like, so that it is possible to realize a lighting device with better light distribution characteristics. It becomes.

In addition, even when the light source area becomes large due to a plurality of light sources, the illumination device is compact, and the illumination device equipped with the illumination device has excellent light distribution characteristics without causing an increase in size. An apparatus can be realized.

It is a figure for demonstrating the lighting device of 1st Embodiment of this invention. It is a figure for demonstrating an example of the illuminating device using the said illuminating device. It is a figure which shows the simulation result of the light distribution characteristic in the case where the illuminating device of 1st Embodiment is applied to the illuminating device of FIG. 2, and a comparative example. It is a figure for demonstrating the lighting device of 2nd Embodiment of this invention. It is a figure which shows the simulation result of the light distribution characteristic at the time of applying the illuminating device of 2nd Embodiment to the illuminating device of FIG.

Hereinafter, the present invention will be described in detail by the following embodiments.

In the following description, members having the same function and action are denoted by the same reference numerals and description thereof is omitted.
(First embodiment)
FIG. 1 is a diagram for explaining the outline of the lighting device 10 according to the first embodiment, in which FIG. 1A is a perspective view, FIG. 1 (c) is a cross-sectional view taken along the line BB of FIG. 1 (a).

In the following embodiment, an LED is used as a light source. However, the present invention can be applied to other light sources such as a semiconductor laser in addition to the LED.

As shown in FIGS. 1A, 1 </ b> B, and 1 </ b> C, the optical member 14 has a columnar concave lens 22 formed on the incident surface 16 that faces the LED light source 12, and is opposite to the incident surface 16. A columnar convex lens 24 is formed on the exit surface 18 which is the side surface.

The axial direction related to light input / output is the Z-axis, the bus-line direction of the columnar concave lens 22 is set to the Y-axis, and the child-wire direction is set to the X-axis. Further, the generatrix direction of the columnar convex lens 24 is the X axis, and the child line direction is the Y axis.

The curvature of the columnar concave lens 22 is 0 in the generatrix direction, the curvature in the sub-wire direction is smaller than 0, and the power that the lens can bend light is different in the X-axis direction and the Y-axis direction.

Similarly, in the columnar convex lens 24, the curvature in the generatrix direction is 0, the curvature in the child line direction is larger than 0, and the power that the lens can bend light is different in the X-axis direction and the Y-axis direction. become.

Further, the generatrix direction of the columnar concave lens 22 and the generatrix direction of the columnar convex lens 24 are orthogonal.

In the case of this embodiment, the LED light sources 12 are formed in a matrix on a substrate 13 such as a printed circuit board, and the columnar concave lens 22 and the columnar convex lens 24 have a pair of intersections with each of the LED light sources 12. The lighting device 10 of the present embodiment is formed by arranging a plurality of columnar concave lenses 22 and columnar convex lenses 24 so as to correspond to 1.

Further, when the columnar concave lens 22 is formed on the surface facing the LED light source 12, a space is formed between the LED light source 12 and the optical member 14.

Therefore, the columnar concave lens 22 is effective not only for controlling the light distribution characteristic, which is the gist of the present invention, but also for preventing the optical member 14 from being deteriorated due to heat generated by the LED light source 12.

Although the optical member 14 can be prevented from being deteriorated by maintaining the distance between the incident surface 16 that is the lower surface of the optical member 14 and the LED light source 12, the LED light source 12 is also provided as in the present embodiment. Are used in the form of an array, the light emitted from the LED light source 12 is likely to enter the adjacent lens, making it difficult to control the light distribution characteristics.

Since there is a limit to the distance between the incident surface 16, which is the lower surface of the optical member 14, and the LED light source 12, by providing the columnar concave lens 22, the space is increased and the optical member 14 is heated by the heat generated by the LED light source 12. Prevents deterioration.

As shown in FIG. 1B, the columnar concave lens 22 is set in a shape that spreads the light, and the light incident from the LED light source 12 is spread in the XZ plane by the columnar concave lens 22.

In the first embodiment, the cross-sectional shape of the columnar concave lens 22 in the sub-wire direction is, for example, an elliptical shape having a major axis of 6.5 mm and a distance between two focal points of 8.0 mm.

The geometrical central axis S1 of the columnar concave lens 22 and the optical axis J1 of the LED light source 12 parallel to the Z-axis direction that is the central axis of the intensity distribution are shifted in the X-axis direction that is the generatrix direction of the columnar convex lens 24. ing.

The illumination device 10 of the present embodiment can spread light with the direction different from the direction of the optical axis J1 of the LED light source 12 as the central axis by doing in this way. In other words, by shifting the optical axis J1 of the LED light source 12 and the geometric center axis S1 of the columnar concave lens 22 along the generatrix direction of the columnar convex lens 24, the light is weighted in the −X direction or the + X direction. Can be expanded.

FIG. 1 (c) shows a YZ plane which is a BB cross section of the optical member 14 shown in FIG. 1 (a).

The columnar convex lens 24 is set to have a shape that squeezes light, and the light incident from the LED light source 12 is narrowed in the YZ plane by the columnar convex lens 24.

In the first embodiment, the cross-sectional shape of the columnar convex lens 24 in the sub-wire direction is, for example, a circle having a radius of 6 mm. Further, the optical axis J1 of the LED light source 12 and the geometric center axis S2 of the columnar convex lens 24 coincide with each other.

In the columnar convex lens 24, as in the case of the columnar concave lens 22, the geometrical central axis S2 of the columnar convex lens 24 and the optical axis J1 of the LED light source 12 are shifted in the Y-axis direction that is the generatrix direction of the columnar concave lens 22. Thus, it is possible to focus light in the −Y direction or the + Y direction.

Therefore, when it is desired to control the direction of light focused in the YZ plane, the optical axis J1 of the LED light source 12 and the geometric center axis S2 of the columnar convex lens 24 may be set to be shifted.

The shapes of the columnar concave lens 22 and the columnar convex lens 24, the geometric center axis S1 of the columnar concave lens 22, the distance between the geometric center axis S2 of the columnar convex lens 24 and the optical axis J1 of the LED light source 12 are necessary. In consideration of the light distribution characteristics, it was obtained using optical analysis software.

Further, as the material of the optical member 14, for example, an acrylic resin, a polystyrene resin, a methacrylic resin, a polycarbonate resin, glass or the like that has good transparency in the visible light region and a large transmittance may be used.

In the illumination device 10 described above, the light emitted from the LED light source 12 is light distribution controlled by the columnar concave lens 22 and the columnar convex lens 24 formed on the optical member 14.

The columnar concave lens 22 has a function of spreading light, and the columnar convex lens 24 has a function of focusing light. Further, since the columnar concave lens 22 and the columnar convex lens 24 have orthogonal generatrix directions, the light distribution characteristics on the two surfaces of the XZ plane and the YZ plane can be individually controlled only by the optical member 14.

The columnar concave lens 22 and the columnar convex lens 24 formed on the optical member 14 are formed so as to correspond to the LED light sources 12 on a one-to-one basis, and therefore the size of the optical member 14 is the same as that of the light source 1. The size and size of the lighting device can be reduced.

FIG. 2 shows a schematic diagram of an illumination apparatus 50 using the illumination device 10 of the present embodiment.

The lighting device 50 is configured so that the lighting device 10 described in the present embodiment is arranged in a V shape and emits light downward in the drawing.

The illumination device 50 is configured by arranging a plurality of LED light sources 12 in an array on the substrate 13 in order to make the light source luminous flux equivalent to an illumination device using another light source such as a fluorescent lamp.

In this embodiment, as an example, the illumination device 10 in which the LED light sources 12 are arranged in 8 rows with a pitch of 11 mm in the X-axis direction and 28 rows with a pitch of 8.5 mm in the Y-axis direction is V-shaped when viewed in the XZ plane. Two are used in the form of a mold.

The total number of LED light sources 12 is 448, and the total light source luminous flux is 2800 lm. Further, the two lighting devices 10 are arranged in a V shape, and the included angle is 120 °. Note that the number of the LED light sources 12 and the luminous flux are appropriately changed and set according to the size of the luminous flux required for the illumination device. In addition, the included angle of the lighting device 10 is also changed and set as appropriate depending on a housing, a cover, and the like (not shown) that are required for the lighting device.

In the illumination device 50, the illumination device 10 in which a plurality of LED light sources 12 are arranged in a matrix on the substrate 13 is arranged in a V shape. In such a case, the light emitted from each lighting device 10 is spread in the −X axis direction and the + X axis direction, and the light emitted from the lighting device is efficiently spread in the ± X axis direction by combining them. be able to.

FIG. 3A shows the result of simulating the light distribution characteristics in the illumination device 50 of the first embodiment. As a comparative example, FIG. 3B also shows light distribution characteristics in the case where the optical member 14 is not provided.

Note that the simulation was performed in the case where the lighting device 50 was installed with an elevation angle of 20 °, that is, an inclination of 20 ° with the X axis as the rotation axis, in consideration of the form when actually attached to a road or the like.

In the illumination device 50 of the present embodiment shown in FIG. 2, light is spread on the XZ plane by the columnar concave lens 22 in the optical member 14. It turns out that it is large compared with the comparative example. In addition, it can be seen that the light distribution characteristics are reduced compared to the comparative example because light is focused on the YZ plane by the columnar convex lens 24 in the optical member 14.

Table 1 shows the result of simulating the illuminance when the lighting device 50 of the first embodiment is installed on a road. As a comparative example, the value is also shown when there is no optical member 14.

The horizontal illuminance shown in Table 1 is an average of the horizontal illuminance on the road surface, and the vertical illuminance is the minimum value of the vertical illuminance at a height of 1.5 m at the center of the road. The lighting device 50 is installed at a height of 4.5 m and an interval of 35 m so that the XZ plane shown in FIG. 1 is parallel to the traveling direction of the road.

Further, as in the simulation of the light distribution characteristics, the lighting device 50 shown in FIG. 2 is installed at an elevation angle of 20 °. The road width was 5 m.

As shown in FIG. 3A, the lighting device 50 according to the first embodiment has optimized light distribution characteristics, and thus can achieve a larger illuminance than the comparative example. Also, the illuminance reference (1) provides an outline of the face of a person 4 meters ahead (average horizontal plane illumination value 5.0 lx or more, minimum vertical surface illumination value 1.0 lx or more), (2) walking 4 meters ahead Satisfactory results are also obtained for the person's behavior and attitude (average horizontal plane illuminance of 3.0 lx or more, minimum vertical plane illuminance of 0.5 lx or more).

As described above, in the illumination device 50 according to the first embodiment, only the optical member 14 having the columnar concave lens 22 and the columnar convex lens 24 controls the light distribution characteristics of the two surfaces and optimizes the light distribution characteristics. can do. Therefore, the illumination device 50 having a large horizontal plane illuminance and vertical plane illuminance can be realized without increasing the output of the LED light source 12. Thereby, energy saving and the number of installation of the illuminating device 50 can be reduced.

In addition, since it is not necessary to use a casing or the like as a reflector, the lighting device 50 with excellent design can be realized.

Further, even when an arrayed LED light source 12 having a large light source area is used, the lens is formed so as to correspond to each LED light source 12, so that the light distribution characteristics are improved without causing the lighting device 50 to be enlarged. An excellent illumination device 50 can be realized.

In addition, in this 1st Embodiment, you may provide the power supply part in the illuminating device 50, the housing | casing for fixing the LED light source 12, a cover, etc. When used outdoors as the lighting device 50, the LED light source 12 and the optical member can be protected from rain, dust, and the like.

The lighting device 10 according to the first embodiment and the lighting device 50 using the lighting device 10 can be widely used for outdoor lighting such as a crime prevention light, a street light, a road light, a park light, and other lighting.
(Second Embodiment)
Next, 2nd Embodiment of the illuminating device of this invention is described based on FIG.

As shown in FIGS. 4A, 4B, and 4C, the second embodiment differs from the first embodiment only in the shape of the optical member 14 in the illumination device 10 of the first embodiment. Therefore, in the second embodiment, the same parts as those in the first embodiment described above are denoted by the same reference numerals, and different points from the first embodiment will be mainly described.

FIG. 4 (a) shows the shape of the optical member 14 in the second embodiment. In the second embodiment, the optical member 14 has an ellipsoidal concave lens 26 formed on the surface facing the LED light source 12 and an ellipsoidal convex lens on the surface opposite to the surface facing the LED light source 12. 28 is formed. The ellipsoidal concave lens 26 and the ellipsoidal convex lens 28 are formed by arranging a plurality of lenses so as to correspond to the LED light sources 12 on a one-to-one basis.

Here, the minor axis direction of the ellipsoidal convex lens 28 coincides with the Y-axis direction in the illumination device 10 as shown in FIG.

Also, the curvature of the ellipsoidal concave lens 26 and the ellipsoidal convex lens 28 is different between the X axis and the Y axis which is an axis perpendicular to the X axis. That is, the lens according to the present invention has a power that is the ability to bend the light in the X-axis direction and the Y-axis direction.

In the second embodiment, as an example, the shape of the ellipsoidal concave lens 26 is an ellipsoid having a distance between two focal points of 0 mm and a major axis of 5 mm, that is, a spherical shape. The shape of the ellipsoidal convex lens 28 is an ellipsoidal shape with a focal distance of 8 mm and a major axis of 6.5 mm.

FIG. 4B shows an AA cross section which is the XZ plane of the lighting device 10 shown in FIG. The cross-sectional shape of the ellipsoidal concave lens 26 in the XZ plane is a shape that spreads light.

Therefore, the light incident from the LED light source 12 is spread in the XZ plane by the ellipsoidal concave lens 26. The optical axis J1 of the LED light source 12 and the geometric center axis S4 of the ellipsoidal convex lens 28 are shifted in the X-axis direction, which is the major axis direction of the ellipsoidal convex lens 28.

In this way, light can be spread around a direction different from the direction of the geometrical central axis S4 of the ellipsoidal convex lens 28. In other words, by shifting the optical axis J1 of the LED light source 12 and the geometrical central axis S4 of the ellipsoidal convex lens 28 in the X-axis direction that is the major axis direction of the ellipsoidal convex lens 28, light is emitted in the −X direction or the + X direction. It can be expanded.

Further, the geometric center axis S3 of the ellipsoidal concave lens 26 is made to coincide with the optical axis J1 of the LED light source 12. This is because the ellipsoidal concave lens 26 forms a space between the LED light source 12 and the optical member 14 to prevent deterioration of the optical member 14 due to heat generated by the LED light source 12.

In the second embodiment, since the light distribution characteristic can be controlled only by the ellipsoidal convex lens 28, the ellipsoidal concave lens 26 is shaped and arranged with an emphasis on preventing the optical member 14 from being deteriorated. If the optical member 14 has high heat resistance, the ellipsoidal concave lens 26 may not be formed. This is preferable because the optical member 14 can be easily manufactured.

Alternatively, the shape and arrangement of the ellipsoidal concave lens 26 may be set as appropriate, and light distribution control may be performed in combination with the ellipsoidal convex lens 28. In this case, the degree of freedom of light distribution characteristics that can be realized is widened, which is preferable.

FIG. 4C shows a YZ plane which is a BB cross section of the optical member 14 shown in FIG. The shape of the ellipsoidal convex lens 28 in the YZ plane is a shape that squeezes light. Therefore, the light incident from the LED light source 12 is narrowed in the YZ plane by the ellipsoidal convex lens 28.

In the YZ plane, the optical axis J1 of the LED light source 12 and the geometric center axis S4 of the ellipsoidal convex lens 28 coincide with each other.

Also in the YZ plane, by shifting the optical axis J1 of the LED light source 12 and the geometric center axis S4 of the ellipsoidal convex lens 28 in the Y-axis direction, which is the minor axis direction of the ellipsoidal convex lens 28, the −Y direction or It is possible to focus light in the + Y direction.

Therefore, when it is desired to control the direction of light focused in the YZ plane, the optical axis J1 of the LED light source 12 and the geometric center axis S3 of the ellipsoidal concave lens 26 may be set to be shifted.

In addition, the shape of the ellipsoidal concave lens 26 and the ellipsoidal convex lens 28, and the distance between the geometrical central axis S3 of the ellipsoidal concave lens 26, the geometrical central axis S4 of the ellipsoidal convex lens 28, and the optical axis J1 of the LED light source 12. These were obtained using optical analysis software in consideration of the required light distribution characteristics.

In the illumination device 10 described above, the light emitted from the LED light source 12 is light distribution controlled by the ellipsoidal concave lens 26 and the ellipsoidal convex lens 28 constituting the optical member 14.

The cross-sectional shape of the ellipsoidal convex lens 28 on the XZ plane has a function of spreading light, and the cross-sectional shape of the YZ plane has a function of focusing light.

Therefore, the light distribution characteristics on the two surfaces of the XZ plane and the YZ plane can be individually controlled only by the optical member 14. In addition, since the ellipsoidal concave lens 26 and the ellipsoidal convex lens 28 formed on the optical member 14 are formed so as to correspond to the LED light sources 12 on a one-to-one basis, the size of the optical member 14 is The size is almost the same as that of the light source 12, and the lighting device 50 can be reduced in size and thickness.

FIG. 5 shows the result of simulating the light distribution characteristics when the illumination device 10 of the second embodiment is applied to the illumination device 50 of the form of FIG. 2 as in the first embodiment. The simulation conditions and the like are the same as in the first embodiment.

In the illumination device 50 according to the second embodiment, the light is spread on the XZ plane by the cross section in the major axis direction of the ellipsoidal convex lens 28 formed on the optical member 14, and therefore the 90 ° side is set to the wide angle side from the 0 ° side. It can be seen that the light intensity at the wide angle is larger than that of the comparative example. In addition, it can be seen that the light distribution characteristics are reduced compared to the comparative example because light is focused on the YZ plane by the cross section of the ellipsoidal convex lens 28 in the minor axis direction.

In addition, Table 2 shows the simulation result of the illuminance when the lighting device 50 of the second embodiment is installed on a road. As a comparative example, the value is also shown when there is no optical member 14. The simulation conditions and the like are the same as in the first embodiment.

As shown in the graph of FIG. 5, the lighting device 50 of the second embodiment has optimized light distribution characteristics, and thus can achieve a larger illuminance than the comparative example. Also, the illuminance reference (1) provides an outline of the face of a person 4 meters ahead (average horizontal plane illumination value 5.0 lx or more, minimum vertical surface illumination value 1.0 lx or more), (2) walking 4 meters ahead Satisfactory results are also obtained for the person's behavior and attitude (average horizontal plane illuminance of 3.0 lx or more, minimum vertical plane illuminance of 0.5 lx or more).

As described above, in the illumination device 50 using the illumination device 10 of the second embodiment, the light distribution characteristics of the two surfaces are controlled only by the optical member 14 having the ellipsoidal concave lens 26 and the ellipsoidal convex lens 28. In addition, the light distribution characteristics can be optimized.

Therefore, the lighting device 50 having a large horizontal plane illuminance and a vertical plane illuminance can be realized without increasing the output of the LED light source 12. Thereby, energy saving and the number of installation of the illuminating device 50 can be reduced.

In addition, since it is not necessary to use a casing or the like as a reflector, the lighting device 50 with excellent design can be realized.

Further, even when an arrayed LED light source 12 having a large light source area is used, the lens is formed so as to correspond to each LED light source 12, so that the light distribution characteristics are improved without causing the lighting device 50 to be enlarged. An excellent illumination device 50 can be realized.

In addition, in this 2nd Embodiment, you may provide the power supply part in the illuminating device 50, the housing | casing for fixing a light source, a cover, etc. When the lighting device 50 is used outdoors, the light source and the optical member can be protected from rain, dust, and the like, and failure of the lighting device 50 can be prevented.

Also, the lighting device 10 of the second embodiment and the lighting device 50 using the lighting device 10 can be widely used for outdoor lighting such as crime prevention lights, street lights, road lights, park lights, and other lighting.

As described above, in the illumination device of the present invention, at least one of the entrance surface and the exit surface, when the optical axis direction of the lens is the Z-axis direction, the X-axis direction and the X-axis direction are the same. A lens having a different power, which is the ability of the lens to bend light, is formed with respect to the Y-axis direction which is a vertical axis direction.

In the illumination device of the present invention, the lenses having different powers in the X-axis direction and the Y-axis direction are a columnar concave lens and a columnar convex lens formed on a surface opposite to the surface on which the columnar concave lens is formed. The generatrix of the columnar concave lens and the generatrix of the columnar convex lens intersect perpendicularly.

According to the lighting device of the present invention, the columnar concave lens and the columnar convex lens are arranged orthogonally. By controlling the cross-sectional shape of each of the columnar concave lens and the columnar convex lens in the sub-line direction, the light distribution characteristics in the cross-section parallel to the sub-line direction of the lens can be independently controlled.

Also, both the columnar concave lens and the columnar convex lens do not require an expensive triaxial processing apparatus, and the die cost can be reduced.

Further, the illumination device of the present invention is characterized in that the lens having a different word for the X axis and the Y axis is an ellipsoidal concave lens or an ellipsoidal convex lens.

By controlling the cross-sectional shape of the ellipsoid in the major axis direction and the minor axis direction, it is possible to independently control the light distribution characteristics in the major axis direction or a section parallel to the minor axis direction.

The present invention can be widely used in various lighting devices including a lighting device used outdoors such as a crime prevention light, a street light, a road light, a park light, and a lighting device using the lighting device.

DESCRIPTION OF SYMBOLS 10 Illumination device 12 LED light source 13 Board | substrate 14 Optical member 16 Incident surface 18 Outgoing surface 22 Columnar concave lens 24 Columnar convex lens 26 Ellipsoidal concave lens 28 Ellipsoidal convex lens 50 Illumination device S1 Geometric center axis S2 of columnar concave lens 22 Geometry of columnar convex lens 24 Geometric central axis S3 Geometric central axis S4 of the ellipsoidal concave lens 26 Geometric central axis J1 of the ellipsoidal convex lens 28 Optical axis of the LED light source 12

Claims (5)

1. A light source;
   An optical member having an entrance surface and an exit surface for the light emitted from the light source;
   A lens is formed on at least one of the entrance surface or the exit surface,
   An illumination device, wherein an optical axis of the light source is arranged so as to be shifted from a geometrical central axis of at least one lens formed on the entrance surface or the exit surface.
2. The illumination device according to claim 1, wherein at least one of the lenses is a lens having different powers in the X-axis direction and the Y-axis direction.
3. Lenses having different powers in the X-axis direction and the Y-axis direction are
   A columnar concave lens;
   A columnar convex lens formed on a surface opposite to the surface on which the columnar concave lens is formed;
   The lighting device according to claim 2, wherein a bus line of the columnar concave lens and a bus bar of the columnar convex lens intersect perpendicularly.
4. 3. The illumination device according to claim 2, wherein the lenses having different powers in the X-axis direction and the Y-axis direction are ellipsoidal concave lenses or ellipsoidal convex lenses.
5. An illumination device using the illumination device according to any one of claims 1 to 4.

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