JP5490028B2 - Optical lens and illumination device - Google Patents

Description

  The present invention relates to an optical lens and an illumination device. In particular, the present invention relates to an illumination device that includes a transparent lens in front of an LED (light-emitting diode) light source and controls the light to a desired light distribution while reducing glare of the light source.

  Compared with conventional light sources such as fluorescent lamps and incandescent bulbs, LEDs have recently improved indoor lighting devices such as downlights, spotlights and guide lights, and outdoor lights such as security lights and street lights, as their luminous efficiency and luminous flux have improved. It has begun to be used as a light source for lighting devices. In particular, since many crime prevention lights are installed in an urban area, the use of LEDs with low power consumption has a great effect on the environment. In addition, since LEDs have a long life, they can extend the replacement cycle of light sources and suppress expenditures of local governments, so that rapid replacement from fluorescent lamps is currently in progress.

  FIG. 12 is a diagram illustrating an example of a security light installed along a road.

  The security light is an illuminating device for protecting night traffic safety, and is installed on a utility pole along the road as shown in FIG. In order to illuminate roads and passers-by, traffic lights have a predetermined illuminance on the road and around the face. In addition, a security light usually requires several hundred to several thousand [lm (lumen)] luminous flux per unit, whereas the luminous flux per LED light is only about 100 [lm]. A plurality of LEDs are mounted on the security light. Currently, LEDs are still more expensive than the fluorescent lamps and incandescent bulbs, and the resulting luminous flux is still high, so the cost of LED light sources accounts for about half of the total cost of the lighting equipment, not just for security lights. ing.

  In the security light, in order to suppress the installation cost, the installation interval is widened while satisfying the required illuminance on the road surface and around the height of the face, and in order to reduce the equipment cost, It is required to reduce the number. In this way, in order to efficiently use the light flux of a small number of LEDs and widen the installation interval, the light is spread in the road traveling direction, and the light is squeezed and concentrated in the road width direction. Different light distributions are needed.

  In order to control the light to the desired light distribution, a transparent lens is arranged in front of the LED, and the same lens surface is provided for each LED, and the LED and lens surfaces are arranged in the same number of arrays. This is an effective and simple technique. Furthermore, in each lens, the light incident surface or the light emitting surface from the LED, or both surfaces have different shapes in the road traveling direction and the road width direction, so that different light distributions can be obtained in two orthogonal directions. (For example, refer to Patent Document 1).

JP 2010-186657 A

  Since the LED is small and has a small light emitting area, it has high luminance. That is dazzling.

  As described above, when a transparent lens is arranged in front of the LED and the light distribution control is performed, the lens surface corresponding to one LED is a continuous surface that does not have discontinuous portions on both the entrance surface and the exit surface. is there. In the case of such a lens, the light emitting surface of the LED can be seen directly through the lens, so it is dazzling, and depending on the direction in which the lens is viewed, it may be dazzling than the LED itself.

  In order to reduce glare, if the lens entrance and exit surfaces are textured, or if the lens is made of a translucent resin kneaded with a diffusing material, the desired light distribution will be achieved. It becomes impossible to control light. And with a small number of LEDs, the required illuminance described above cannot be satisfied, and compensation such as narrowing the installation interval of security lights or increasing the number of LEDs to be mounted is required, resulting in an increase in cost.

  An object of the present invention is, for example, to suppress glare while controlling light to different light distribution distributions in two orthogonal directions.

The optical lens according to one aspect of the present invention is:
Having an incident surface on which light emitted from at least one light source is incident and an exit surface that emits light;
One of the entrance surface and the exit surface corresponding to one light source of the at least one light source is a cylinder lens array including a plurality of cylinder lenses having first cylindrical surfaces whose buses are substantially parallel to each other. On the other side, one cylinder lens having a second cylindrical surface whose generating line is substantially perpendicular to the generating line of the first cylindrical surface is formed.

  According to one aspect of the present invention, a cylinder lens array including a plurality of cylinder lenses having first cylindrical surfaces whose buses are substantially parallel to each other is formed on one of the entrance surface and the exit surface of the optical lens. On the other hand, since a single cylinder lens having a second cylindrical surface whose generating line is substantially perpendicular to the generating line of the first cylindrical surface is formed, the distribution of light distribution is different in two orthogonal directions. The glare can be suppressed while controlling the light.

FIG. 2 is an exploded perspective view of the lighting device according to Embodiment 1. FIG. 3 is a partially enlarged view of a lens region and a substrate of the lighting apparatus according to Embodiment 1. 6 is a table showing design values of lens surfaces corresponding to one LED in the lens region of the illumination device according to Embodiment 1. FIG. The elements on larger scale of the lens area | region and board | substrate of the illuminating device which concern on a comparative example. FIG. 6 is a diagram showing a luminance distribution in a lens region of the lighting apparatus according to Embodiment 1; The figure which shows distribution of the brightness | luminance of the lens area | region of the illuminating device which concerns on a comparative example. FIG. 6 is a partially enlarged view of a lens region and a substrate of the lighting apparatus according to Embodiment 2. 10 is a table showing design values of lens surfaces corresponding to one LED in the lens region of the illumination device according to Embodiment 2. The graph which shows the light distribution of the road advancing direction with the illuminating device which concerns on Embodiment 1, and the illuminating device which concerns on Embodiment 2. FIG. The graph which shows the light distribution in the road width direction of the illuminating device which concerns on Embodiment 1, and the illuminating device which concerns on Embodiment 2. FIG. FIG. 6 is a diagram showing a luminance distribution in a lens region of the lighting apparatus according to Embodiment 2. The figure which shows an example of the crime prevention light installed along the road.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is an exploded perspective view of a lighting device 10 according to the present embodiment.

  The lighting device 10 includes an LED 11, a substrate 12, a connector 13, a cable 14, a power supply 15, a housing 16, a packing 17, and a cover 18. In the present embodiment, the lighting device 10 is used as a security light. However, the lighting device 10 may be used as a street light or other outdoor lighting equipment, or a corridor or a passage in a building. It may be used as an indoor lighting fixture that illuminates

  The LEDs 11 that are light sources are arranged and mounted on the substrate 12 in a substantially straight line at equal intervals. The substrate 12 is made of a metal such as aluminum, or a plate material such as glass epoxy resin or ceramic, and a circuit pattern (not shown) for lighting and driving the LED 11 is printed on the surface thereof. The substrate 12 is supplied with power from the power source 15 via the connector 13 and the cable 14. The substrate 12 and the power source 15 are fixed to the housing 16 by screws or the like. The housing 16 is made of die cast such as aluminum or magnesium, or a plastic molded product. The LED 11, the substrate 12, the connector 13, the cable 14, and the power supply 15 are housed in a housing 16.

  A cover 18 is attached to the front surface and the light output side of the housing 16 with a waterproof packing 17 sandwiched by screws or the like. The cover 18 is a transparent resin such as acrylic or polycarbonate, and is manufactured by injection molding. A lens region 19 (an example of an optical lens) is provided in a portion of the cover 18 positioned in front of the LED 11. In FIG. 1, the lens region 19 is not drawn with an actual lens shape, and only the region is shown by shading. The lens region 19 may be provided as an independent lens member separate from the cover 18, but the cost can be reduced by forming the lens region 19 integrally with the cover 18 of the outer shell of the apparatus. The parts other than the lens area 19 of the cover 18 are preferably grounded for improving the appearance. In consideration of the cleaning of the cover 18, only the inner surface of the cover 18 and the surface on the housing 16 side may be used as the matte surface.

  In addition, the casing 16 may be equipped with a sheet metal cover (not shown) that covers the power supply 15 and an illuminance sensor (not shown) that determines day and night.

  As shown in FIG. 12, in the case of a security light installed along the road, the front of the cover 18 is not oriented in the vertical (below) direction, but is inclined at an angle of about 20 [deg (degrees)]. Installed to face the road center line. For this reason, although the directions of the “road width direction” arrows shown in FIG. 1 and FIG. 12 are strictly different, in this specification, they are regarded as substantially the same direction. Treat as the same “road width direction”.

  FIG. 2 is a partially enlarged view of the lens region 19 and the substrate 12 on which the LED 11 is mounted.

  The lens region 19 has an incident surface 19a on which light emitted from the light emitting surface 11a of the LED 11 is incident, and an output surface 19b that emits light incident on the incident surface 19a. A cylinder lens array including a plurality of cylinder lenses is formed on the incident surface 19a. Each cylinder lens of this cylinder lens array has a first cylindrical surface 19c whose generatrices are substantially parallel to each other. On the other hand, one cylinder lens is formed on the emission surface 19b. This one cylinder lens has a second cylindrical surface 19d whose generating line is substantially perpendicular to the generating line of the first cylindrical surface 19c. As described above, in the present embodiment, the plurality of LEDs 11 are arranged substantially linearly on the substrate 12, and one cylinder lens array on the incident surface 19 a is formed for each of the plurality of LEDs 11. One cylinder lens on the emission surface 19b is formed for the plurality of LEDs 11 as a whole. The cylinder lens array on the incident surface 19a is formed such that the center of each cylinder lens array is positioned on the optical axis of each LED 11. One cylinder lens on the emission surface 19b is formed so that the central axis of the cylinder lens intersects the optical axis of each LED 11. In the present embodiment, each cylinder lens of the cylinder lens array on the incident surface 19a is a concave lens, and one cylinder lens on the output surface 19b is a convex lens.

  Thus, the entrance surface 19a, that is, the surface on the LED 11 side in the lens region 19 is an array of cylinder lenses. Not only because the LEDs 11 are repeatedly arranged in the road traveling direction, but also on the lens surface corresponding to one LED 11, an array is finely formed. In the array, many thin cylinder lenses are lined up in the direction of the road. Each cylinder lens has a concave curvature in the road traveling direction, and its bus bar extends in the road width direction. On the other hand, the exit surface 19b facing the entrance surface 19a is not an array but is formed by one cylinder lens. The cylinder lens on the exit surface 19b side is formed in a direction orthogonal to the cylinder lens array on the entrance surface 19a, that is, has a convex curvature in the road width direction, and the bus bar extends in the road traveling direction.

  In the present embodiment, the LEDs 11 are arranged on the substrate 12 along the road traveling direction. For this reason, the incident surface 19a has a shape in which a cylinder lens array corresponding to one LED 11 is repeated in the road traveling direction, and the exit surface 19b has a shape in which convex cylinder lenses are connected in the road traveling direction. ing. In the present embodiment, the LEDs 11 are arranged along the road traveling direction, but may be arranged along the road width direction. In this case, the incident surface 19a has a shape in which cylinder lens arrays corresponding to one LED 11 are connected in the road width direction, and the output surface 19b has a shape in which convex cylinder lenses are arranged in the road width direction by the number of LEDs 11. become. That is, one cylinder lens array is formed for the entire plurality of LEDs 11 on the incident surface 19a, and one cylinder lens is formed for each of the plurality of LEDs 11 on the output surface 19b. Further, the LEDs 11 may be arranged in a matrix form such as m × n columns. In this case, the lens region 19 has a shape corresponding to the arrangement of the LEDs 11 as described above.

  As described above, the security light requires different light distributions in two orthogonal directions, such as spreading light in the road traveling direction and concentrating light in the road width direction. In order to produce such a light distribution, in the present embodiment, a cylinder lens in a direction orthogonal to the incident surface 19a side and the exit surface 19b side is used, and the incident surface 19a is formed as a concave cylinder lens so as to emit light in the road traveling direction. The exit surface 19b has a convex cylinder lens, and has the function of converging light in the road width direction. Further, each concave cylinder lens on the incident surface 19a side is a thin cylinder lens, and a large number of them are arranged to form an array.

  The light emitted from the light emitting surface 11a of the LED 11 and incident on one cylinder lens in the cylinder lens array on the incident surface 19a has its divergence angle widened by the concave action. The radius of curvature, width, and depth of each cylinder lens on the incident surface 19a are not all the same value, and the curvature of each cylinder lens is set so that the light distribution in the road traveling direction of the lighting device 10 as a whole becomes a target distribution. The radius, width, and depth are selected as appropriate. That is, each cylinder lens diffuses light, but the light distribution is controlled for the entire array.

  As described above, in order to reduce the glare of the LED 11, there is a method of making the lens surface a satin surface, but the incident light rays are randomly scattered on the pear surface. On the other hand, in the present embodiment, it is not as small as the unevenness of the pear ground, but by microscopically diffusing light microscopically with a fine cylinder lens array in which each shape is appropriately designed, Controls the light distribution. The concept is to alleviate the glare of the LED 11 on the pear ground, but in order to make the light distribution distribution a target distribution rather than a perfect diffusion, the minute irregularities on the pear ground are each made into an appropriate shape. Since it is difficult to design and manufacture each minute unevenness, it is an array of cylinder lenses with a certain size that can be designed and manufactured.

  As described above, in the case of a security light installed along a road, the lighting device 10 is attached to a support pole such as a utility pole standing on the ground so as to be inclined at a predetermined angle (for example, 20 deg). It is done. Therefore, in the present embodiment, the illumination device 10 is attached so that the lens region 19 is inclined at a predetermined angle in the generatrix direction of the first cylindrical surface 19c.

  FIG. 3 is a table showing design values of lens surfaces corresponding to one LED 11 in the lens region 19.

  In FIG. 3, the curvature radius and width of each cylinder lens constituting the lens surface corresponding to one LED 11 in the lens region 19, and the depth (in the concave central portion) if concave (that is, the incident surface 19 a side). If it is convex (that is, on the exit surface 19b side), the design value of the height (in the central part of the convex) is shown. As shown in FIG. 2, the center position of each cylinder lens on the incident surface 19a side is the x axis in the road traveling direction, and the center of the light emitting surface 11a of the LED 11 (that is, the intersection with the optical axis of the LED 11) is x. = 0 and represented by the value of x. In the present embodiment, the interval between the LEDs 11 is 20 [mm (millimeter)], and the size of the light emitting surface 11a of the LED 11 is φ (diameter) 4.3 [mm].

  In order to alleviate the glare of the LED 11 viewed through the lens, the narrower the width of each cylinder lens on the incident surface 19a side, the better. The size of the light emitting surface 11a of the LED 11 is 1/2 or less as shown in FIG. It is preferable to make it thin. That is, in each cylinder lens of the cylinder lens array on the incident surface 19a, the width of the first cylindrical surface 19c is desirably ½ or less of the width of the light emitting surface 11a of the LED 11. Further, although not necessarily required, it is preferable that the width of the cylinder lens is narrowed and the pitch is narrowed as the absolute value of x increases as the distance from the front surface x = 0 of the LED 11 increases. That is, it is desirable that each cylinder lens of the cylinder lens array on the incident surface 19a has a smaller width of the first cylindrical surface 19c as the cylinder lens is farther from the center of the light emitting surface 11a of the LED 11.

  Furthermore, in order to efficiently realize the light distribution in which the light spreads in the road traveling direction with a small number of LEDs 11, it is preferable that the radius of curvature of the cylinder lens becomes substantially large as the absolute value of x increases. . That is, it is desirable that each cylinder lens of the cylinder lens array on the incident surface 19a has a larger radius of curvature of the first cylindrical surface 19c as the cylinder lens is farther from the center of the light emitting surface 11a of the LED 11. Alternatively, as the absolute value of x increases, the depth of the cylinder lens should be made substantially shallow. That is, as for each cylinder lens of the cylinder lens array of the incident surface 19a, it is desirable that the cylinder lens farther from the center of the light emitting surface 11a of the LED 11 has a smaller depth of the first cylindrical surface 19c.

  FIG. 4 is a partially enlarged view of the lens region 19 ′ of the lighting device according to the comparative example and the substrate 12 on which the LEDs 11 are mounted.

  In this comparative example, in the illumination device that differs from the present embodiment only in the shape of the lens region 19 ′, the lens surface corresponding to one LED 11 in the lens region 19 ′ has no discontinuous portion, that is, a continuous surface. It is configured. The incident surface 19a 'side is a plane for simplicity. The exit surface 19b 'side is a toroidal surface in which the cross section in the road traveling direction (the cross section viewed from the road width direction) is an aspheric surface, and has a drum shape as shown in FIG. The cross section in the road traveling direction is concave in front of the LED 11, that is, in the vicinity of the center of the lens, and becomes convex as the distance from the center increases. On the other hand, the cross section in the road width direction (cross section seen from the road traveling direction) is a simple convex (the outline is an arc). The lens region 19 ′ has a shape in which this drum lens is connected by the number of LEDs 11 along the road traveling direction in which the LEDs 11 are arranged.

  FIG. 5 is a diagram showing the luminance distribution of the lens region 19 of the present embodiment. FIG. 6 is a diagram showing a luminance distribution of the lens region 19 ′ of the comparative example.

2 and the toroidal aspherical surface of the comparative example of FIG. 4 satisfy the required illuminance on the road surface and around the face height. 5 and 6, the front direction of the cover 18 and the lens regions 19 and 19 ′ is set to 0 [deg] and the road is viewed from an angle of 60 [deg] in order to compare the glare as the lighting device. In this case, the luminance distribution of the lens regions 19 and 19 ′ is shown. The luminous flux per LED 11 is 100 [lm]. The brightness of the brightest bright spot in FIG. 5 was 2.2 million [cd / m ² (candela per square meter)], and the brightness in FIG. 6 was 5.2 million [cd / m ² ]. As described above, in the cylinder lens array according to the present embodiment, glare is greatly suppressed as compared with a lens having a continuous surface that does not have discontinuous portions.

  That is, according to the present embodiment, the lens surface corresponding to one LED 11 in the lens region 19 of the cover 18 is a cylinder lens in a direction orthogonal to the incident surface 19a and the exit surface 19b, and is incident on the incident surface 19a side. By arraying a large number of thin cylinder lenses, it is possible to suppress glare while controlling light to a target light distribution, that is, different light distribution in two orthogonal directions.

  In addition, since the lens region 19 of the cover 18 of the illumination device 10 according to the present embodiment is a fine cylinder lens array, the entire cover 18 has undulating undulations and has a substantially uniform thickness. For this reason, when the cover 18 is manufactured by injection molding, sink marks and warpage are unlikely to occur, and manufacturing is easy.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  In the present embodiment, the shape of the lens region 19 is changed to another shape in the illumination device 10 according to the first embodiment.

  FIG. 7 is a partially enlarged view of the lens region 19 of the lighting apparatus 10 according to the present embodiment and the substrate 12 on which the LEDs 11 are mounted.

  In the first embodiment, the cylinder lens array on the incident surface 19a of the lens region 19 has a concave curvature, but in the present embodiment, it has a convex curvature. That is, in this embodiment, each cylinder lens of the cylinder lens array on the incident surface 19a is a convex lens.

  When the concave cylinder lens array is manufactured by injection molding, the mold has a convex shape. Since it is necessary to project the mold, the amount of removal in the mold processing is large, processing time is required, and the cost is increased. Further, a sharp cutting tool such as a needle is required for processing a boundary portion where cylinder lenses are adjacent to each other. Pointed blades are very worn and take a lot of processing time. Further, even if a sharp blade is used, the boundary between the cylinder lenses may have a somewhat concave curvature, and the molded product may be convex, and the concave cylinder lens array may be somewhat deformed. Thus, the concave cylinder lens array has some manufacturing difficulties.

  On the other hand, in the convex cylinder lens array of the present embodiment, the mold shape is concave, and these difficulties are eliminated, so that the mold can be manufactured inexpensively and easily.

  In the case where the incident surface 19a is a convex cylindrical lens, intuitively, it does not seem to have the function of spreading light in the road traveling direction and the necessary light distribution cannot be obtained. By designing the curvature radius, width, and height of the cylinder lens appropriately, the desired light distribution can be obtained. Nevertheless, as with the concave cylinder lens array, of course, the effect of reducing the glare of the LED 11 can be obtained.

  FIG. 8 is a table showing design values of lens surfaces corresponding to one LED 11 in the lens region 19.

  FIG. 8 shows design values of the radius of curvature, width, and height (of the convex central portion) of each cylinder lens constituting the lens surface corresponding to one LED 11 in the lens region 19. As shown in FIG. 7, the center position of each cylinder lens on the incident surface 19a side is the x axis in the road traveling direction, and the center of the light emitting surface 11a of the LED 11 (that is, the intersection with the optical axis of the LED 11) is x. = 0 and represented by the value of x. As in the first embodiment, in this embodiment, the distance between the LEDs 11 is 20 [mm], and the size of the light emitting surface 11a of the LED 11 is φ4.3 [mm].

  As in the first embodiment, in order to alleviate the glare of the LED 11 viewed through the lens, the narrower the width of each cylinder lens on the incident surface 19a side, the better, and the light emitting surface 11a of the LED 11 as shown in FIG. It is preferable to make it 1/2 or less than the size. That is, in each cylinder lens of the cylinder lens array on the incident surface 19a, the width of the first cylindrical surface 19c is desirably ½ or less of the width of the light emitting surface 11a of the LED 11. Further, although not necessarily required, it is preferable that the width of the cylinder lens is narrowed and the pitch is narrowed as the absolute value of x increases as the distance from the front surface x = 0 of the LED 11 increases. That is, it is desirable that each cylinder lens of the cylinder lens array on the incident surface 19a has a smaller width of the first cylindrical surface 19c as the cylinder lens is farther from the center of the light emitting surface 11a of the LED 11.

  Furthermore, in order to efficiently realize the light distribution in which the light spreads in the road traveling direction with a small number of LEDs 11, it is preferable that the radius of curvature of the cylinder lens becomes substantially large as the absolute value of x increases. . That is, it is desirable that each cylinder lens of the cylinder lens array on the incident surface 19a has a larger radius of curvature of the first cylindrical surface 19c as the cylinder lens is farther from the center of the light emitting surface 11a of the LED 11. Alternatively, the height of the cylinder lens is preferably made substantially lower as the absolute value of x becomes larger. That is, it is desirable that each cylinder lens of the cylinder lens array on the incident surface 19a has a smaller height of the first cylindrical surface 19c as the cylinder lens is farther from the center of the light emitting surface 11a of the LED 11.

  FIG. 9 is a graph showing the light distribution in the road traveling direction between the lighting device 10 according to the first embodiment and the lighting device 10 according to the present embodiment. FIG. 10 is a graph showing the light distribution in the road width direction between the lighting device 10 according to the first embodiment and the lighting device 10 according to the present embodiment.

  9 and 10 show the light distribution obtained by the illumination device 10 in the first embodiment and the present embodiment, and as a comparative example, the light distribution of the substrate 12 itself on which the LED 11 is mounted is also “LED It is shown as “Single”. As shown in FIG. 9, a light distribution in which light is spread is obtained in the road traveling direction. Moreover, as shown in FIG. 10, light distribution obtained by converging light conversely in the road width direction is obtained. From FIG. 9 and FIG. 10, it can be seen that the same light distribution is obtained in the first embodiment and the present embodiment.

  FIG. 11 is a diagram illustrating a luminance distribution of the lens region 19.

In FIG. 11, as in FIG. 5 of the first embodiment, the front direction of the cover 18 and the lens area 19 is 0 [deg], and the luminance of the lens area 19 when viewed from the angle of the road traveling direction 60 [deg]. Distribution is shown. The luminous flux per LED 11 is 100 [lm]. The brightness of the brightest luminescent spot in FIG. 11 is 2.1 million [cd / m ² ], which is equivalent to FIG. 5 in the first embodiment.

  From the above, even if the incident surface 19a is a convex cylindrical lens array instead of a concave, it suppresses glare while controlling light to a target light distribution, that is, different light distribution in two orthogonal directions. Can do. In the first embodiment, a concave cylinder lens array and in this embodiment a convex cylinder lens array can achieve the same level of light distribution and luminance, so that it can be understood that a cylinder lens array having unevenness may be used. Further, in the present embodiment, since both the incident surface 19a and the exit surface 19b are formed by convex cylinder lenses, the lens region 19 is turned over, the exit surface 19b is a cylinder lens array, and the entrance surface 19a is an array. It can be seen that even with a single cylinder lens, the light distribution and brightness can be satisfied. That is, a cylinder lens array including a plurality of cylinder lenses having first cylindrical surfaces 19c whose buses are substantially parallel to each other is formed on the exit surface 19b, and the buses are formed on the incident surface 19a with respect to the buses of the first cylindrical surface 19c. One cylinder lens having the substantially cylindrical second cylindrical surface 19d may be formed. However, in this case, the light distribution in the road traveling direction is controlled on the exit surface 19b side, and the light distribution in the road width direction is controlled on the incident surface 19a side. Furthermore, since there is no great difference in light distribution / brightness between the first embodiment and the present embodiment, it can be seen that the exit surface 19b may be a concave or mixed cylinder lens array instead of convex.

  In other words, according to the present embodiment, even if the cylinder lens array on the incident surface 19a is a convex cylinder lens array, the light is controlled to have a target light distribution, that is, a different light distribution in two orthogonal directions. , Can reduce glare.

  In addition, since the incident surface 19a of the illumination device 10 according to the present embodiment is a convex cylinder lens array, the mold of the cover 18 can be manufactured inexpensively and easily.

  DESCRIPTION OF SYMBOLS 10 Illuminating device, 11 LED, 11a Light emission surface, 12 Board | substrate, 13 Connector, 14 Cable, 15 Power supply, 16 Case, 17 Packing, 18 Cover, 19, 19 'Lens area | region, 19a, 19a' Incident surface, 19b, 19b 'Outgoing surface, 19c first cylindrical surface, 19d second cylindrical surface.

Claims (11)

In an optical lens having an incident surface for entering light emitted from at least one light source and an exit surface for emitting light,
One of the entrance surface and the exit surface corresponding to one light source of the at least one light source is a cylinder lens array including a plurality of cylinder lenses having first cylindrical surfaces whose buses are substantially parallel to each other. On the other side, one cylinder lens having a second cylindrical surface whose generating line is substantially perpendicular to the generating line of the first cylindrical surface is formed ,
The cylinder lens array spreads light in a direction substantially perpendicular to a generatrix of the first cylindrical surface,
Said one cylinder lens, optical lens, wherein Rukoto collected stop light in a direction substantially perpendicular to the generatrix of the second cylindrical surface. An optical lens according to claim 1;
An illumination device comprising: the at least one light source having a light emitting surface that emits light to the incident surface. At least one light source having a light emitting surface;
Met optical lens having an incident surface and emission surface for emitting the light entering the light emitted from the light emitting surface, said input surface and said output surface corresponding to the light source one portion of the at least one light source One of them is formed with a cylinder lens array composed of a plurality of cylinder lenses having first cylindrical surfaces whose buses are substantially parallel to each other, and on the other hand, the buses are substantially perpendicular to the buses of the first cylindrical surface. An optical lens formed with one cylinder lens having a second cylindrical surface ;
With
In each of the cylinder lenses of the cylinder lens array, a cylinder lens farther from the center of the light emitting surface has a smaller width of the first cylindrical surface . Each cylindrical lens of the cylindrical lens array is a convex lens, the illumination apparatus according to claim 2 or 3, wherein the height of the center from a distant cylindrical lens as the first cylindrical surface of the light emitting surface is small. At least one light source having a light emitting surface;
Met optical lens having an incident surface and emission surface for emitting the light entering the light emitted from the light emitting surface, said input surface and said output surface corresponding to the light source one portion of the at least one light source One of them is formed with a cylinder lens array composed of a plurality of cylinder lenses having first cylindrical surfaces whose buses are substantially parallel to each other, and on the other hand, the buses are substantially perpendicular to the buses of the first cylindrical surface. An optical lens formed with one cylinder lens having a second cylindrical surface ;
With
Each cylinder lens of the cylinder lens array is a concave lens, and the depth of the first cylindrical surface is smaller as the cylinder lens is farther from the center of the light emitting surface . Each cylindrical lens of the cylindrical lens array, any of the lighting device according to claim 2 to 5, wherein the width of the first cylindrical surface is equal to or less than 1/2 of the width of the light-emitting surface. Each cylindrical lens of the cylindrical lens array, any of the lighting device according to claim 2 to 6, characterized in that the radius of curvature of the center from a distant cylindrical lens as the first cylindrical surface of the light-emitting surface is large. The lighting device includes:
The at least one light source includes a plurality of LEDs arranged substantially linearly,
3. The cylinder lens array is formed for each of the plurality of LEDs, and the one cylinder lens is formed for the whole of the plurality of LEDs. The lighting device according to any one of 7. The lighting device includes:
The at least one light source includes a plurality of LEDs arranged substantially linearly,
The cylinder lens array is formed for the plurality of LEDs as a whole, and the one cylinder lens is formed for each of the plurality of LEDs. The lighting device according to any one of 7. The lighting device further includes:
A housing that houses the at least one light source;
The lighting device according to claim 2, further comprising a cover that is formed integrally with the optical lens and attached to the housing.   11. The lighting device according to claim 2, wherein the illuminating device is attached to a support erected on the ground so that the optical lens is inclined at a predetermined angle in a generatrix direction of the first cylindrical surface. Lighting equipment.

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