JP5409595B2 - Lighting device - Google Patents

Description

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

  LEDs have features such as low power consumption and long life. For this reason, in recent years, illumination devices using LEDs as light sources have been used for downlights, spotlights, and the like from the viewpoint of energy saving. LEDs are not limited to such indoor lighting fixtures, but are also used as light sources for outdoor lighting fixtures such as crime prevention lights and street lights.

  For crime prevention lights, the lighting effects that should be ensured for crime prevention are Class A (understand the outline of the face of a person 4 meters ahead), or at least Class B (a pedestrian's behavior / posture 4 meters away) It is desirable to understand. As an illuminance standard for ensuring the lighting effect, in class A, the average value of horizontal illuminance on the road surface is 5.0 lux (lx) or more, and the minimum vertical illuminance is 1.0 lux or more, class In B, it is specified that the average value of horizontal illuminance on the road surface is 3.0 lux or more and the minimum value of vertical illuminance is 0.5 lux or more (see Non-Patent Document 1). Here, the horizontal illuminance refers to the average illuminance on the road surface (5 [meters] × security light installation interval [meters]). Vertical plane illuminance means the minimum illuminance of a vertical plane that is 1.5 meters above the road surface on the center line of the road and perpendicular to the road axis.

  While satisfying the above-mentioned lighting standards, it is also required to reduce the installation cost by increasing the installation interval of security lights as much as possible, and to reduce the power consumption by reducing the number of light sources used.

  As a technique for satisfying the above-mentioned illumination standard, there are methods described in Patent Document 1 and Patent Document 2. In the method described in Patent Literature 1, light distribution is controlled using a side reflector disposed along the longitudinal direction of the light source. In the method described in Patent Document 2, a light source mounting portion is formed in a V-shaped cross section, and light distribution is controlled using a plurality of reflectors. In any method, the light distribution is further controlled using a prism.

JP 2004-63174 A JP 2010-153399 A

“Aiming for safe and secure town development, crime prevention lighting guide vol.4”, Japan Security Equipment Association, February 2010

  The security light is a lighting device that is used by being attached to a high place of a support column installed on the sidewalk side of a road. At this time, the area where the light is desired to be emitted from the lighting device is not a vertical (directly below) direction of the lighting device but an obliquely downward road surface. For this reason, the illuminating device is installed at a predetermined angle so as to face the direction of the region where light is to be irradiated.

  Therefore, the light distribution in the two directions of the width direction of the road and the traveling direction of the road is controlled separately (that is, so as to have different light distribution characteristics), and the light is effectively irradiated to the region to be irradiated with light. It is important to realize such a light distribution and reduce the installation cost and power consumption.

  However, in the conventional technology, there is a problem that the light distribution in the two directions cannot be controlled separately, or even if it is possible, the structure becomes complicated, the number of parts increases, and the cost increases.

  In addition, when using a light source with a small light emitting point such as an LED, it is necessary to irradiate the road surface with light by arranging the LEDs closely in order to reduce unevenness in illuminance. There was a problem that the brightness of the film increased and dazzling increased.

  An object of the present invention is to separately control light distribution in two directions with a simple configuration, for example. Furthermore, it aims at reducing glare.

The optical lens according to one aspect of the present invention is:
An optical lens composed of a plate-like translucent member, one of the two plate surfaces is incident on the light and the other is emitted on the optical lens,
A cross section viewed from one of two directions substantially perpendicular to the plate surface and substantially perpendicular to each other is curved in a convex shape and a cross section viewed from the other is concave at a plurality of locations on either of the two plate surfaces. A curved light refracting portion is formed.

  According to one aspect of the present invention, light distribution in two directions can be separately controlled with a simple configuration.

FIG. 5 shows an installation example of a security light according to the first embodiment. The (a) perspective view of the illuminating device which concerns on Embodiment 1, (b) explanatory drawing of an installation angle. (A) AA sectional drawing of the illuminating device which concerns on Embodiment 1, (b) BB sectional drawing. (A) Top view of LED which concerns on Embodiment 1, (b) CC sectional drawing. FIG. 4A is a diagram illustrating light distribution characteristics in the XZ ′ plane of the lighting apparatus according to Embodiment 1, and FIG. 4B is a diagram illustrating light distribution characteristics in the Y′Z ′ plane. 5A is a graph showing light distribution characteristics in the XZ ′ plane of the lighting apparatus according to Embodiment 1, and FIG. 5B is a graph showing light distribution characteristics in the Y′Z ′ plane. (A) The graph which shows the light distribution characteristic of only the light which injected into the 2nd entrance plane (when the 2nd entrance plane is not made into a diffusion surface) of the optical lens array of the illuminating device which concerns on Embodiment 1, (b) Illuminance. The table | surface which shows the calculated result. FIG. 6 is a perspective view of a lighting device according to Embodiment 2. (A) DD sectional drawing of the illuminating device which concerns on Embodiment 2, (b) EE sectional drawing. 5A is a graph showing light distribution characteristics in the XZ ′ plane of the lighting apparatus according to Embodiment 2, and FIG. 5B is a graph showing light distribution characteristics in the Y′Z ′ plane. The table | surface which shows the result of having calculated the illumination intensity of the illuminating device which concerns on Embodiment 2. FIG. (A) DD sectional drawing of the state which shifted the position of the optical lens array of the illuminating device which concerns on Embodiment 3, (b) The graph which shows the light distribution characteristic of the state which shifted the position of the optical lens array. (A) The figure which shows distribution of the vertical surface illuminance in the state which has the optical lens array in the original position of the illuminating device which concerns on Embodiment 3, (b) Distribution of the vertical surface illuminance in the state which shifted the position of the optical lens array FIG. (A) DD sectional drawing which shows the structural example of the adjustment mechanism of the illuminating device which concerns on Embodiment 3, (b) DD sectional drawing which shows another structural example of an adjustment mechanism.

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

Embodiment 1 FIG.
FIG. 1 is a diagram illustrating an installation example of a security light 200 according to the present embodiment.

  The security light 200 includes a lighting device 100 and a support column 101 erected on the ground. The illumination device 100 is installed at a high place by a support column 101. The column 101 is installed on the sidewalk side of the road, for example. The illuminating device 100 is attached to the upper part of the support | pillar 101 with the predetermined | prescribed angle (theta) so that the light emission surface (bottom surface) may face the direction of the desired area | region in the horizontal surface 102 of a road.

  In the following, as shown in FIG. 1, the X axis is set in the traveling direction of the road, the Y axis is set in the width direction of the road, the Z axis is set in the vertical direction of the road, the horizontal plane 102 of the road is set to the XY plane, and the vertical plane 103 of the road is set. The YZ plane is assumed. Further, the Y ′ axis is set in the tilt direction of the light emitting surface of the illumination device 100 with respect to the Y axis, that is, the Y axis is tilted at an angle θ, and the direction perpendicular to the Y axis, that is, the Z axis is the same as the Y ′ axis. The Z ′ axis is placed in a direction inclined at an angle θ.

  In this embodiment, the lighting device 100 is used for the security light 200. However, the lighting device 100 may be used for a street light or other outdoor lighting equipment, and may be used for a corridor or a passage in a building. It may be used for indoor lighting equipment that illuminates.

  FIG. 2A is a perspective view of the lighting device 100. FIG. 2B is an explanatory diagram of a predetermined angle (installation angle) θ at which the illumination device 100 is installed. Fig.3 (a) is AA sectional drawing of the illuminating device 100 of Fig.2 (a). FIG.3 (b) is BB sectional drawing of the illuminating device 100 of Fig.2 (a).

  The illumination device 100 includes a plurality of LEDs 111 (an example of a light source), an optical lens array 110 (an example of an optical lens) disposed on the front surface (a position facing the light emitting surface) of each LED 111, and a substrate 112 (an example of a light source module). ). The optical lens array 110 and the substrate 112 are positioned by a lens holder (not shown).

  The optical lens array 110 is made of a plate-like translucent member, and one of the two plate surfaces enters light and the other emits light. Here, an acrylic resin is used as the translucent member, but other translucent members may be used as long as they are materials that transmit light emitted from the LED 111. For example, a transparent material such as polycarbonate resin or glass can be used.

  Of the two plate surfaces of the optical lens array 110, light refraction portions 130 are formed at a plurality of locations on the plate surface on the light emitting side. As shown in FIG. 3B, the light refracting unit 130 is formed from one (X-axis direction) of two directions (X-axis direction and Y′-axis direction) substantially perpendicular to the plate surface and substantially perpendicular to each other. The cross section is curved in a convex shape. As shown in FIG. 3A, the light refracting portion 130 has a concave section as viewed from the other of the two directions (Y′-axis direction). As shown in FIG. 2A, here, it is assumed that the light refracting portions 130 are formed at 24 places (3 × 8 rows), but the number of the light refracting portions 130 is not limited thereto.

  In the plate surface opposite to the plate surface on which the light refracting portion 130 of the optical lens array 110 is formed, that is, the plate surface on the light incident side, light is incident on each of the positions facing the light refracting portion 130. A portion 140 is formed. The light incident portion 140 has a concavely curved cross section viewed from both of the two directions (the X-axis direction and the Y′-axis direction).

  A light diffusing unit 150 that diffuses light is formed around the light incident unit 140 on the plate surface where the light incident unit 140 of the optical lens array 110 is formed. A light diffusing portion 150 that diffuses light may be formed around the light refracting portion 130 on the plate surface where the light refracting portion 130 of the optical lens array 110 is formed.

  In the optical lens array 110, a first incident surface 110 a is formed on the surface of the light incident portion 140, a second incident surface 110 b is formed on the surface of the light diffusing portion 150, and a first surface is formed on the surface of the light refracting portion 130. An emission surface 110c is formed. As described above, when the light diffusing unit 150 is also formed around the light refracting unit 130, the second emission surface 110 d is formed on the surface of the light diffusing unit 150.

  As described above, of the two plate surfaces of the optical lens array 110, on the plate surface on the light incident side, the first incident surface 110a located on the front surface of the LED 111 (at a certain distance from the light emitting surface), A second incident surface 110b surrounding the first incident surface 110a is formed. As shown in FIG. 3A, the first incident surface 110a is symmetric with respect to the optical axis 120 passing through the approximate center of the LED 111 in the XZ ′ plane and has a concave shape at the center. The inflection point is reached at a position away from 120, and the convex shape changes as it goes further outward. The second incident surface 110b is substantially parallel to the XY ′ plane and has a substantially flat shape.

  Of the two plate surfaces of the optical lens array 110, the first light exit surface 110 c that refracts and emits light from the first incident surface 110 a and the first light exit are formed on the light exit side plate surface. A second emission surface 110d surrounding the surface 110c is formed. As shown in FIG. 3B, the first emission surface 110 c has a convex shape with the vertex near the optical axis 120 as a target with respect to the optical axis 120 in the Y′Z ′ plane. The second exit surface 110d is substantially parallel to the XY ′ plane and has a substantially flat shape.

  The LED 111 is mounted on the substrate 112 in the same arrangement as the arrangement of the light refracting section 130 (and the light incident section 140) on the plate surface where the light refracting section 130 of the optical lens array 110 is formed.

  As shown in FIG. 2B, the illumination device 100 has a direction in which the cross section of the light refracting portion 130 of the optical lens array 110 appears concave (Y) among the two directions (X-axis direction and Y′-axis direction). In the “axial direction”, the optical lens array 110 is attached to the support column 101 so as to be inclined at an angle θ. That is, the illumination device 100 is tilted at an angle θ in the YZ plane.

  FIG. 4A is a plan view of the LED 111 (a view of the light emitting surface side). FIG. 4B is a cross-sectional view taken along the line CC of FIG.

  The LED 111 includes a ceramic package 111a, an LED element 111b, and a silicone resin 111c mixed with a phosphor. The LED element 111b is mounted in a recess that forms the opening surface 111d (light emitting surface) of the ceramic package 111a. The silicone resin 111c is filled in the recess. For example, when the LED element 111b emits blue light, the phosphor mixed in the silicone resin 111c is excited by a part of the wavelength component of the blue light to emit yellow light. As a result, white light, which is mixed light of blue light and yellow light, is emitted from the opening surface 111d of the ceramic package 111a. The ceramic package 111a has a power supply electrode (not shown), and power is supplied from the electrode to the LED element 111b via a wire (not shown).

  Below, the effect of this Embodiment is demonstrated.

  FIG. 5A is a diagram illustrating light distribution characteristics in the XZ ′ plane of the lighting apparatus 100. FIG. 5B is a diagram illustrating light distribution characteristics in the Y′Z ′ plane of the lighting apparatus 100. 5A and 5B, arrows indicate the traveling direction (trajectory) of light emitted from the LED 111. FIG. 6A is a graph showing the light distribution characteristics in the XZ ′ plane of the illumination device 100. FIG. 6B is a graph showing the light distribution characteristics in the Y′Z ′ plane of the illumination device 100. FIG. 7A is a graph showing the light distribution characteristic of only the light incident on the second incident surface 110b of the optical lens array 110 (when the second incident surface 110b is not a diffusing surface).

  First, the light passing through the first incident surface 110a will be described.

  The light emitted from the LED 111 and reaching the first incident surface 110a is refracted to be incident on the optical lens array 110, and most of the light reaches the first output surface 110c, and further refracts. Then, the light is emitted from the optical lens array 110.

  As shown in FIGS. 5A and 5B, the first incident surface 110a has a conic shape (for example, a paraboloid, an ellipsoid, and a hyperboloid), and the light emitted from the LED 111 is converted into an emission angle. Refract in the direction in which 121 becomes larger. That is, when the light incident section 140 of the optical lens array 110 receives light emitted from the LED 111, the light incident section 140 refracts the light in a direction away from the optical axis 120.

  As shown in FIG. 5A, the first emission surface 110c has a concave shape at the center in the XZ ′ plane, and refracts light in a direction in which the emission angle 121 becomes larger. That is, the light refracting portion 130 of the optical lens array 110 is viewed from the direction (Y ′ axis direction) in which the cross section of the light refracting portion 130 looks concave out of the two directions described above (the X axis direction and the Y ′ axis direction). In this case, the light incident on the light incident portion 140 is further refracted in a direction away from the optical axis 120 and emitted. Thereby, as shown to Fig.6 (a), light distribution can be controlled so that the illumination intensity of the big output angle 121 becomes strong.

  As shown in FIG. 5B, the first emission surface 110c has a convex shape in the Y′Z ′ plane, and acts to collect the spread light from the LED 111 and irradiate the road surface. . That is, the light refracting portion 130 of the optical lens array 110 is viewed from the direction (X axis direction) in which the cross section of the light refracting portion 130 looks convex out of the two directions (X axis direction and Y ′ axis direction). The light incident on the light incident portion 140 is refracted in the direction approaching the optical axis 120 and emitted. Thereby, as shown in FIG. 6B, the light distribution can be controlled so that the illuminance at the small emission angle 121 near the center of the optical axis 120 becomes the strongest.

  As shown in FIG. 6A, in the light distribution in which the illuminance at the large emission angle 121 is high, a wide area of the road can be irradiated. However, it is not appropriate to use the inclined plane because a portion of locally high illuminance is formed on the road surface.

  As shown in FIG. 6B, the light distribution with the strongest illuminance at a small exit angle 121 near the center of the optical axis 120 cannot irradiate a wide area of the road, but tilted at a predetermined angle θ. A relatively narrow area can be illuminated uniformly.

  Therefore, in this embodiment, as the light distribution on the Y′Z ′ plane inclined at the predetermined angle θ, the light distribution as shown in FIG. As the light distribution in the XZ ′ plane where it is desired to irradiate widely in the traveling direction, the light distribution as shown in FIG. Thereby, it is possible to control light distribution in two directions separately.

  In the present embodiment, the light distribution in the two directions is controlled separately using the first emission surface 110c, but the light distribution in the two directions is controlled using the first incident surface 110a. Similar effects can be obtained. That is, the light refraction part 130 of the optical lens array 110 may be formed at a plurality of locations on the plate surface on the light incident side of the two plate surfaces of the optical lens array 110. In this case, the light refracting unit 130 has a convex cross section viewed from one (Y′-axis direction) of two directions (X-axis direction and Y′-axis direction) substantially perpendicular to the plate surface and substantially perpendicular to each other. It is curved, and the cross section seen from the other (X-axis direction) is curved in a concave shape.

  Next, light that passes through the second incident surface 110b will be described.

  As shown in FIGS. 5A and 5B, the light emitted from the LED 111 and reaching the second incident surface 110b is diffused and incident into the optical lens array 110, and the first emitting surface 110c and second It reaches the exit surface 110d and exits from the optical lens array 110.

  The effect obtained by making the 2nd entrance plane 110b into a diffusion surface is explained.

  Depending on the height of electronic components other than the LED 111 mounted on the substrate 112, the LED 111 and the optical lens array 110 disposed in front of the LED 111 may be disposed with a certain distance therebetween. In this case, part of the light emitted from the LED 111 is not incident on the first incident surface 110a but is incident on the second incident surface 110b.

  At this time, when the light incident on the second incident surface 110b is emitted from the optical lens array 110, the light tends to concentrate in one direction, so that the luminance in that direction is increased.

  The graph of FIG. 7A shows the result of calculating the light distribution characteristic of only the light incident on the second incident surface 110b when the second incident surface 110b is not a diffusing surface (first incident surface 110a). Is a light distribution characteristic of the XZ ′ plane of the lighting device 100 when the mirror surface is a mirror surface). From this result, it can be seen that a phenomenon occurs in which the illuminance is concentrated and becomes strong near an emission angle of 50 °. In FIG. 7A, since the second incident surface 110b is a mere flat surface, the light emitted from the LED 111 is refracted in a direction approaching the optical axis 120, and this light is condensed on the first outgoing surface 110c. Therefore, it is assumed that the above phenomenon occurs. Although depending on the distance between the LED 111 and the optical lens array 110, about 20% of the light emitted from the LED 111 may be incident on the second incident surface 110b. It is important to avoid this phenomenon. Therefore, in the present embodiment, the second incident surface 110b is used as a diffusing surface, the light incident on the second incident surface 110b is diffused and used as background light, thereby reducing glare.

  FIG. 7B is a table showing the results of calculating the illuminance of the lighting device 100.

  The table of FIG. 7B shows the result of calculating the horizontal illuminance and the vertical illuminance on the road using the lighting device 100 at an installation height of 4.5 meters and an installation interval of 30 meters. From this result, it can be seen that the lighting device 100 satisfies Class A and Class B, which are illuminance standards for security lights.

  As described above, in the present embodiment, the transparent optical lens array 110 disposed in front of the LED 111 includes at least the first incident surface 110a positioned in front of the LED 111 and the second incident that surrounds the first incident surface 110a. And a light incident surface constituted by the surface 110b. In addition, the optical lens array 110 includes a first emission surface 110c that mainly refracts and emits light from the first incidence surface 110a, and a second emission surface 110d that surrounds the first emission surface 110c. The cross-sectional shape of the first emission surface 110c in the XZ ′ plane is a concave shape in the center, and the cross-sectional shape in the Y′Z ′ plane is a convex shape. For this reason, with a simple configuration, the light distribution in the two directions of the YZ plane, which is the width direction of the road, and the XZ plane, which is the travel direction of the road, is separately controlled to achieve the desired light distribution, and the installation cost and consumption The lighting device 100 with reduced power can be provided.

  In the present embodiment, the entire or part of the second incident surface 110b of the optical lens array 110 has diffusion characteristics. For this reason, the illuminating device 100 which reduced the glare can be provided.

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

  FIG. 8 is a perspective view of lighting device 100 according to the present embodiment. Fig.9 (a) is DD sectional drawing of the illuminating device 100 of FIG. FIG.9 (b) is EE sectional drawing of the illuminating device 100 of FIG.

  As shown in FIG. 8, in this embodiment, the light refracting unit 130 of the optical lens array 110 has six positions (three pieces) on the plate surface on the light emitting side of the two plate surfaces of the optical lens array 110. × 2 rows).

  As shown in FIGS. 9A and 9B, in the present embodiment, the plate surface opposite to the plate surface on which the light refraction part 130 of the optical lens array 110 is formed, that is, the light incident side. The light incident portion 140 is not formed on the plate surface. In other words, the plate surface has no distinction between the first incident surface 110a and the second incident surface 110b in the first embodiment, and is an incident surface 110e having a substantially flat shape as a whole.

  FIG. 10A is a graph showing the light distribution characteristics in the XZ ′ plane of the lighting device 100. FIG. 10B is a graph showing the light distribution characteristics in the Y′Z ′ plane of the illumination device 100.

  The light emitted from the LED 111 and incident on the incident surface 110e reaches the first emission surface 110c, and is emitted after receiving the action of refraction. A part of the light incident on the incident surface 110e is emitted from the second emission surface 110d.

  As shown in FIG. 9A, the first emission surface 110c has a concave shape at the center in the XZ ′ plane, as in the first embodiment, and the direction in which the emission angle 121 becomes larger from the light. To refract. Thereby, as shown to Fig.10 (a), light distribution can be controlled so that the illumination intensity of the big output angle 121 becomes strong. In the present embodiment, since the entire incident surface 110e is substantially flat, the width of the emission angle 121 is narrower than the light distribution of the first embodiment shown in FIG. Therefore, it is desirable to make the installation interval of the lighting device 100 narrower than in the first embodiment.

  As shown in FIG. 9 (b), the first exit surface 110c has a convex shape in the Y′Z ′ plane, like the first embodiment, and collects the spread light from the LED 111 to create a road. It acts to irradiate the surface. Accordingly, as shown in FIG. 10B, the light distribution can be controlled so that the illuminance at the small emission angle 121 near the center of the optical axis 120 becomes the strongest.

  Thus, in the present embodiment, similarly to the first embodiment, it is possible to separately control light distribution in two directions.

  FIG. 11 is a table showing the results of calculating the illuminance of the lighting device 100.

  The table of FIG. 11 shows the result of calculating the horizontal illuminance and the vertical illuminance on the road using the lighting device 100 at an installation height of 4.5 meters and an installation interval of 10 meters. From this result, it can be seen that the lighting device 100 satisfies Class A and Class B, which are illuminance standards for security lights.

  As described above, the lighting device 100 with a narrow installation interval can satisfy the standard of the horizontal illuminance and the vertical illuminance on the road even if the entire incident surface 110e is flat. According to the present embodiment, it is possible to provide the illumination device 100 that achieves desired light distribution characteristics with a simpler configuration, such as making a lens mold easier.

Embodiment 3 FIG.
The difference between the present embodiment and the second embodiment will be mainly described.

  FIG. 12A is a DD cross-sectional view in a state where the position of the optical lens array 110 of the illumination device 100 of FIG. 8 is shifted. FIG.12 (b) is a graph which shows the light distribution characteristic of the illuminating device 100 in the same state as Fig.12 (a).

  As shown in FIG. 12A, in the present embodiment, the position of the optical lens array 110 having the same shape as in the second embodiment can be shifted in the Y′-axis direction. That is, the optical lens array 110 and the substrate in the direction (Y ′ axis direction) in which the cross section of the light refraction part 130 of the optical lens array 110 looks concave out of the two directions (X axis direction and Y ′ axis direction) described above. The relative position with 112 (and LED 111) can be adjusted. Although not shown in figure, the illuminating device 100 shall be equipped with the adjustment mechanism for that purpose (a specific example is mentioned later).

  As shown in FIG. 12 (b), in the present embodiment, the width of the emission angle 121 is larger than the light distribution in the second embodiment shown in FIG. 10 (a). Thus, in the present embodiment, the width of the emission angle 121 can be adjusted by changing the position of the optical lens array 110.

  FIG. 13A is a diagram illustrating a state in which the optical lens array 110 is in its original position, that is, a distribution of vertical plane illuminance of the illumination device 100 of FIG. FIG. 13B is a diagram showing the distribution of the vertical illuminance of the illumination device 100 of FIG. 12A in a state where the position of the optical lens array 110 is shifted.

  In the distribution of FIG. 13A, a point with higher illuminance moves to the center than in FIG. As described above, in this embodiment, the illuminance distribution on the vertical plane 103 (YZ plane) of the road can be adjusted by changing the position of the optical lens array 110.

  Here, the advantage of adjusting the vertical surface illuminance will be described.

  The vertical surface illuminance defined as the lighting effect for crime prevention is the minimum illuminance of the vertical surface 103 which is 1.5 meters above the road surface on the road center line and perpendicular to the road axis. At this time, if the light distribution characteristics of the security light 200 are the same, the distribution of the vertical plane illuminance differs depending on the installation interval and the angle θ, so the illuminance on the center line of the road becomes weak. There is a case. Therefore, it is important to adjust the vertical surface illuminance particularly when trying to meet the standard of the vertical surface illuminance of the security light 200 having different installation intervals with one lens cover (optical lens array 110).

  In the present embodiment, it is possible to easily adjust the optical lens array 110 in the Y′-axis direction so that the optimal vertical surface illuminance can be obtained. In addition, by making the same adjustments at the time of product assembly and shipping, it is possible to contribute to the improvement of product yield.

  FIGS. 14A and 14B are DD cross-sectional views illustrating configuration examples of the adjustment mechanism in the illumination device 100 of FIG.

  In the example of FIG. 14A, the lens holder 113 that supports the optical lens array 110 is provided with a groove 160 in which the end portion 110f of the optical lens array 110 is slidably fitted in the Y′-axis direction as the adjustment mechanism described above. It has been.

  In the example of FIG. 14B, the optical lens array 110 is provided with a groove 160 as an adjustment mechanism described above, into which the end 113a of the lens holder 113 is slidably fitted in the Y′-axis direction.

  As described above, in the present embodiment, the illumination device 100 has a mechanism that can adjust the relative position between the LED 111 and the optical lens array 110 in a direction parallel to the Y ′ axis. For example, as such a mechanism, an adjustment groove is formed in the optical lens array 110 or the lens holder 113. For this reason, the vertical surface illuminance that is the illuminance reference of the security light 200 can be adjusted to an optimal distribution. In addition, by making the same adjustments at the time of product assembly and shipping, it is possible to contribute to the improvement of product yield.

  As mentioned above, although embodiment of this invention was described, you may implement combining 2 or more embodiment among these. Alternatively, one of these embodiments may be partially implemented. Or you may implement combining two or more embodiment among these partially.

  DESCRIPTION OF SYMBOLS 100 Illuminating device, 101 support | pillar, 102 horizontal surface, 103 vertical surface, 110 optical lens array, 110a 1st entrance surface, 110b 2nd entrance surface, 110c 1st exit surface, 110d 2nd exit surface, 110e entrance surface, 110f end , 111 LED, 111a ceramic package, 111b LED element, 111c silicone resin, 111d opening surface, 112 substrate, 113 lens holder, 113a end, 120 optical axis, 121 emission angle, 130 light refracting part, 140 light incident part, 150 Light diffusion part, 160 groove, 200 security light.

Claims (6)

It is an optical lens composed of a plate-like light-transmitting member, one of the two plate surfaces is incident on the other side and the other is emitted, and at a plurality of locations on either of the two plate surfaces, a light Science lenses that are substantially perpendicular and the light refracting portion in cross-section the cross-section viewed from one of approximately two directions perpendicular to each other as viewed from the other convexly curved concavely curved form with respect to the plate surface,
A light source module in which a light source is mounted in the same arrangement as the arrangement of the light refraction part on the plate surface on which the light refraction part is formed;
An adjustment mechanism for adjusting a relative position between the optical lens and the light source module in a direction in which a cross section of the light refracting portion looks concave in the two directions;
A lighting device comprising: In the optical lens, on the plate surface opposite to the plate surface on which the light refracting portion is formed, the cross section viewed from both of the two directions is curved in a concave shape at each position facing the light refracting portion. A light incident part is formed,
The illumination device according to claim 1, wherein the light refracting unit refracts and emits light incident on the light incident unit. The illumination device according to claim 2, wherein the optical lens has a light diffusion portion that diffuses light around the light incident portion of the plate surface on which the light incident portion is formed. 4. The optical lens according to claim 1, wherein a light diffusing portion for diffusing light is formed around the light refracting portion of the plate surface on which the light refracting portion is formed. Lighting equipment . The lighting device further includes:
A lens holder for supporting the optical lens;
Examples adjusting mechanism, on one of said lens holder and the optical lens, the other end one of the lighting apparatus of claim 1, characterized in that is provided slidably fitted grooves 4. 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 direction in which a cross section of the light refracting portion looks concave in the two directions. The lighting device according to any one of claims 1 to 5 .

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