JP6155878B2 - Optical lens device and lighting apparatus - Google Patents

Description

  The present invention relates to an optical lens device that distributes light from a light-emitting element horizontally.

  2. Description of the Related Art Conventionally, there is known a road lamp that supports an instrument main body on a pillar standing on a road shoulder or the like and illuminates a road surface (see, for example, Patent Document 1).

Japanese Patent No. 4061438

In recent years, along with the increase in luminance of light emitting elements such as LEDs, road lights that use light emitting elements as light sources and optically control the light of the light emitting elements using an optical lens device have been developed. In this road lamp, the optical lens device is formed in a horizontally long arch shape extending in the lane direction of the road, thereby achieving a horizontally long light distribution along the lane direction.
However, this optical lens device is thick, and light from both side edges in the width direction of the road is irradiated outside the road, resulting in poor irradiation efficiency.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an optical lens device capable of distributing light horizontally while suppressing the thickness of the optical lens device.

In order to achieve the above-described object, an optical lens device of the present invention has a refracting portion that traverses directly under a light emitting element, and an incident surface of the refracting portion that faces the light emitting element is the light emission in a cross-sectional view. comprising a top wall extending in the longitudinal direction is curved in the width than the width of the element, and a plurality of side portions extending curved in a wave shape in cross section on both sides of the top wall, the front side of the incident surface A line connecting the edge of the light source and the edge of the rear side in the front-rear direction, the front side is inclined immediately below the light emitting element, and the front side is inclined downward as the angle with respect to the optical axis of the light emitting element increases. And

In the above-described configuration, the boundary between the side surface portions may be curved symmetrically across the top surface portion in plan view.
In the above-described configuration, each of the front edge and the rear edge is curved forward as it goes from the center in the left-right direction to the end, and is inclined with respect to the line in the left-right direction. Also good.
Moreover, the lighting fixture of this invention is equipped with the above-mentioned optical lens apparatus, It is characterized by the above-mentioned.

  According to the present invention, since the plurality of side surfaces are provided in a wave shape, the thickness of the optical lens device can be reduced. In addition, since the top surface portion directly below the light emitting element is wider than the width of the light emitting element, the strong light of the light emitting element can be distributed as designed, and the illuminance is reduced by reducing the light incident on the surface outside the design intention. Unevenness can be prevented. Since the top surface portion and the plurality of side surface portions are curved, the light can be refracted to the optical axis side, so that light can be distributed horizontally.

It is the perspective view which looked at the road light which concerns on embodiment of this invention from the downward direction. FIG. 2 is a perspective view showing the road light of FIG. It is a perspective view which abbreviate | omits a lens body and shows the road light of FIG. It is a perspective view which abbreviate | omits the pressing plate and the light emitting element module for the road light of FIG. It is a figure which shows a light source unit, (A) is a bottom view, (B) is a left view, (C) is a rear view. It is VI-VI sectional drawing of FIG. It is VII-VII sectional drawing of FIG. It is a figure which abbreviate | omits one lens body and shows the light source unit of FIG. 5 (A). It is a figure which shows a pressing plate, (A) is a bottom view, (B) is S1-S1 sectional drawing of (A), (C) is S2-S2 sectional drawing of (A). It is a figure which shows a lens body, (A) is a bottom view, (B) is a left view, (C) is a front view. It is a rear view which shows the lens body and COB type LED of FIG. It is a figure which shows a light source unit in the XII-XII cross section of FIG. It is a figure which shows a light source unit in the XIII-XIII cross section of FIG. It is XIV-XIV sectional drawing of FIG. It is explanatory drawing which shows the relationship between the width | variety of a road, and an outgoing angle. It is a figure which shows the horizontal angle of a refracting part, (A) is AA sectional drawing of FIG. 10, (B) is BB sectional drawing of FIG. 10, (C) is CC sectional drawing of FIG. (D) is DD sectional drawing of FIG. 10, (E) shows EE sectional drawing of FIG. It is a figure which shows a lens body, (A) is a bottom view, (B) is a front view, (C) is S3-S3 sectional drawing of (B), (D) is an enlarged view of the part X of (C). is there. It is a figure which shows a lens body, (A) is a bottom view, (B) is a left view, (C) is S4-S4 sectional drawing of (A), (D) is an enlarged view of the part Y of (C). It is.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, a road lamp will be described as an example of a lighting fixture.
FIG. 1 is a perspective view of a road lamp according to the present embodiment as viewed from below. FIG. 2 is a perspective view showing the road light of FIG. 1 with the lower cover body and the globe omitted. FIG. 3 is a perspective view showing the road light of FIG. 2 with the lens body omitted. FIG. 4 is a perspective view showing the road light of FIG. 3 with the holding plate and the light emitting element module omitted.
As shown in FIG. 1, the road light 1 is a device in which an instrument main body 10 is supported on a distal end portion 3 of an arm type column 5. The arm-type column 5 is a column erected on the roadside ground such as a road shoulder, and is bent from the middle of the column and the tip 3 extends horizontally or at a predetermined angle.

The instrument body 10 is formed of aluminum die casting or the like, forms a box shape having a long rectangular shape in plan view from one end 11A to the other end 11B, and is supported by the tip 3 of the support column 5 in the vicinity of the one end 11A. 11B is installed toward the road side (the roadway side). As shown in FIGS. 1 and 2, an irradiation opening 12 is formed on the bottom surface 10 </ b> A of the instrument main body 10 on the one end 11 </ b> A side, and the irradiation opening 12 is covered with a globe 13.
The instrument body 10 is provided with an arm insertion hole 15 on the back surface 10B (that is, the outer surface near the one end 11A). When supporting the arm-type column 5, the tip 3 of the column 5 is inserted into the arm insertion hole 15 from the back surface 10 </ b> B of the instrument body 10.

The instrument body 10 includes a base case body 20 and a lower cover body 21, which constitute a substantially box-shaped case body of the instrument body 10. The base case body 20 is formed using a material (for example, aluminum or aluminum alloy) that has corrosion resistance enough to withstand outdoor use and that has high thermal conductivity. By using a material having high thermal conductivity, heat generated by the light source unit 25 described later is radiated from the base case body 20, and the light source temperature of the light source unit 25 is maintained at a temperature suitable for the light emitting operation. The lower cover body 21 is formed using a corrosion-resistant material (for example, stainless steel) that can sufficiently withstand outdoor use.
The base case body 20 constitutes the bottom surface 10A, the back surface 10B, the top surface 10C, the front side, and the left and right outer surfaces 10D, 10E, and 10F among the six outer surfaces of the instrument body 10. The lower cover body 21 constitutes a part of the back surface 10B from a part of the bottom surface 10A.

  The base case body 20 is formed with the arm insertion hole 15 and the irradiation opening 12 described above, and the lower surface of the base case body 20 is closed by fixing the globe 13 and the lower cover body 21 with screws. An annular packing (not shown) as a sealing member is fitted over the entire periphery of the glove 13 on the edge side. When the globe 13 is attached to the base case body 20, a packing is sandwiched between the globe 13 and the base case body 20, and the irradiation opening 12 is sealed by the packing.

The interior of the base case body 20 is partitioned by a partition 28 into a clamp mounting chamber 27B on the one end 11A side of the instrument body 10 and a light source chamber 27A on the other end 11B side. The clamp mounting chamber 27B is closed by the lower cover body 21, and the light source chamber 27A is closed by the globe 13. The clamp unit 26 is disposed in the clamp mounting chamber 27B, and the light source unit 25 and the power source 80 constituting the light source are disposed in the light source chamber 27A.
The clamp unit 26 is a support fixture that is inserted and attached to the distal end portion 3 of the support 5 inserted from the arm insertion hole 15 of the instrument body 10. The power source 80 is a control device that supplies power to the light source unit 25 to control lighting of the light source unit 25.

The light source unit 25 is a light source of the road lamp 1 and includes a light emitting element. Specifically, as shown in FIGS. 2 and 3, the light source unit 25 includes a COB type LED (light emitting element module) 35, a module substrate 36, a pressing plate 50, a lens body 39 (optical lens device), and the like. And are assembled and assembled so as to be stacked in this order.
The COB-type LED 35 is a light-emitting device having a chip-on-board (COB) structure in which a large number of LEDs are densely arranged on the LED substrate 34 to form a planar light-emitting portion 35A having a substantially circular shape (which may also be a quadrangle). . The planar light emitting portion 35A has an optical axis F (see FIGS. 6 and 7) in a direction substantially perpendicular to the surface (hereinafter simply referred to as a direct downward direction), and the optical axis F is the instrument body 10. Is disposed in the instrument body 10 in a posture that faces the bottom surface 10A. The COB type LED 35 has a large number of LEDs densely arranged, so that a lamp having a large light intensity and a high luminance can be obtained. The LED substrate 34 is formed of, for example, ceramic having high thermal conductivity in order to efficiently transmit the heat generated by the COB type LED 35 to the back surface.

The module substrate 36 is a rectangular plate-like substrate on which a plurality (two in this embodiment) of COB LEDs 35 are mounted, and constitutes a light emitting element unit 37 together with the COB LEDs 35. The module substrate 36 is made of a material that can obtain the electric withstand voltage of the COB type LED 35 and the base case body 20 and has a heat dissipation property, for example, a ceramic material. The module substrate 36 is bonded to the base case body 20, and the LED substrate 34 is bonded to the module substrate 36.
The holding plate 50 is a member for preventing the COB type LED 35 from dropping when the module substrate 36 or the COB type LED 35 is peeled off. The holding plate 50 is formed on a boss 42 (see FIG. 4) formed integrally with the base case body 20. It is fixed.

  The lens body 39 is a light distribution control member that controls the light distribution of the COB-type LED 35. By these light distribution controls, a horizontally long light distribution that extends to the left and right according to the traveling direction of the road is realized. Specifically, the lens body 39 is disposed so as to cover the light emitting portion 35A of the COB type LED 35, and has a function of distributing light in the left and right direction (lane direction of the road) of light in the vicinity of the optical axis F of the COB type LED 35. Prepare. The lens body 39 includes an optical lens (main body portion) 60 having an entrance surface 61 and an exit surface 62 (see FIG. 6), and a fixing portion 39A that is provided outside the optical lens 60 and fixes the optical lens 60. It is configured. The lens body 39 is fastened together with the holding plate 50 and fixed to the boss 42. The holding plate 50 and the optical lens 60 constitute the optical lens unit 30 of the present embodiment.

As shown in FIGS. 3 and 4, the ceiling surface 20 </ b> A of the base case body 20 constituting the ceiling of the light source chamber 27 </ b> A is provided with a plurality of pedestal surfaces 40 that are in surface contact with and supported by the back surface of the LED substrate 34. . Each pedestal surface 40 has a height from the ceiling surface 20 </ b> A so that the module substrate 36 is positioned on a substantially horizontal plane (a certain distance from the opening surface of the irradiation opening 12).
The pedestal surface 40 is formed integrally with the ceiling surface 20A of the base case body 20, and the heat generated by the COB type LED 35 is transmitted through the LED substrate 34 having high thermal conductivity. The heat of the pedestal surface 40 is transferred to the ceiling surface 20A of the base case body 20, and is radiated to the outside from the top surface 10C of the base case body 20, whereby the light source temperature of the COB type LED 35 is appropriate for the light emitting operation. Maintained at temperature. Of course, instead of the COB type LED 35, another light emitting element such as an LED having another structure or an organic EL may be used.

  In the present embodiment, the base case body 20 is provided with a rectangular frame-shaped surrounding wall 41 surrounding each light source unit 25 on the light source chamber 27A side, and the inside of the surrounding wall 41 is watertight. The light source chamber 27A is waterproofed. That is, over the entire circumference of the surrounding wall 41, the tip 41 </ b> A comes into close contact with the packing of the globe 13 (FIG. 1) carried on the lower cover body 21, thereby sealing the inside of the surrounding wall 41 in a watertight manner.

The clamp mounting chamber 27 </ b> B is provided with a terminal block 70 for connecting an external electric wire drawn out from the distal end portion 3 through the column 5.
A portion of the surrounding wall 41 facing the clamp mounting chamber 27 </ b> B is configured by a partition 28, and a power line drawing hole (not shown) is opened in the partition 28. A power line (not shown) extending from the power source 80 through the power line drawing hole is drawn from the light source chamber 27A to the clamp mounting chamber 27B. At this time, in order to seal the power line drawing hole, a bushing hole (not shown) is fitted into the power line drawing hole, and the bushing is wired through the power line. The power line passed through the bushing is connected to the terminal block 70.

Next, the pressing plate 50 will be described in detail.
5A and 5B are diagrams showing the light source unit 25. FIG. 5A is a bottom view, FIG. 5B is a left side view, and FIG. 5C is a rear view. 6 is a sectional view taken along the line VI-VI in FIG. 5, and FIG. 7 is a sectional view taken along the line VII-VII in FIG. FIG. 8 is a view showing the light source unit 25 of FIG. 5A with one lens body 39 omitted. 9A and 9B are diagrams showing the holding plate 50, FIG. 9A is a bottom view, FIG. 9B is a cross-sectional view taken along line S1-S1 of FIG. 9A, and FIG. 9C is FIG. It is S2-S2 sectional drawing of). Note that the bottom views of FIGS. 5A and 9A correspond to the bottom side of the road light 1.

  The holding plate 50 is a plate-like member for supporting the LED substrate 34 and preventing the COB LED 35 from dropping when the module substrate 36 or the COB LED 35 is peeled off. As shown in FIGS. 5 to 7, the holding plate 50 is larger than the LED substrate 34 in a plan view, and in the present embodiment, is formed to have a size that extends over substantially the entire area of the projection surface of the two optical lenses 60. Has been. A lens facing surface (surface) 51 facing the optical lens 60 of the pressing plate 50 is formed of a material having a relatively high light diffuse reflectance (for example, a white material or a material coated in white), and a light diffusing surface (main surface). In the embodiment, it is a light diffusion reflection surface.

  By making the outer shape of the pressing plate 50 larger than the LED substrate 34, the light reflected to the COB type LED 35 side by the incident surface 61 and the emitting surface 62 of the optical lens 60 can be reflected by the pressing plate 50, so that the light extraction efficiency is improved. it can. In addition, in the present embodiment, since the pressing plate 50 extends substantially in the entire projection surface of the optical lens 60, the light reflected by the optical lens 60 toward the COB type LED 35 is more reflected by the pressing plate 50. Therefore, the light extraction efficiency can be improved. That is, by providing the pressing plate 50, the light reflected by the optical lens 60 toward the COB-type LED 35 can be reflected to the outside of the instrument body 10 (FIG. 1), so that the instrument efficiency can be further improved. Furthermore, since the light reflected by members other than the optical lens 60, for example, the globe 13 (FIG. 1) can be reflected to the outside of the instrument body 10, the efficiency of the instrument can be further improved. In addition, since the lens-facing surface 51 of the holding plate 50 is a diffusing surface, it is possible to prevent the light reflected by the optical lens 60 from creating an unintended spot-shaped irradiating portion, thereby preventing uneven illuminance on the road surface. it can.

  In the present embodiment, the pressing plate 50 includes a contact surface 51 </ b> A that is formed larger to the left and right than the projection surface of the optical lens 60 in a front view and contacts the fixing portion 39 </ b> A of the lens body 39. As described above, the pressing plate 50 is fixed to the boss 42 (FIG. 4) of the base case body 20 by fixing means (not shown) such as a screw for fixing the lens body 39. Thereby, it is not necessary to provide a dedicated fixing means for fixing the pressing plate 50, the number of parts can be reduced, and the assembly process can be simplified. Further, since the pressing plate 50 is fixed outside the lens body 39, the fixing means for the pressing plate 50 is not located in the lens body 39 in the vicinity of the COB type LED 35, and the light extraction efficiency can be improved. Further, since the pressing plate 50 is sandwiched and fixed between the lens body 39 and the base case body 20 (FIG. 4), the pressing plate 50 can be firmly fixed. In addition, since the presser plate 50 is formed larger than the contact surface with the fixing portion 39A of the lens body 39, more light can be reflected, so that the light extraction efficiency and thus the instrument efficiency can be improved.

  As shown in FIG. 8, the pressing plate 50 includes an opening 52 that the light emitting portion 35A faces. The opening 52 is larger than the light emitting portion 35 </ b> A and smaller than the LED substrate 34 in a front view, and the COB type LED 35 is prevented from falling by the peripheral wall 53 constituting the opening 52. More specifically, the LED substrate 34 is formed in a quadrangular shape, and attachment portions 34A and 34A for attaching the wiring W1 to two opposing corner portions are formed. The opening 52 is formed outside the mounting portions 34A and 34A at the positions of the two corner portions where the mounting portions 34A and 34A are provided, and the LED substrate 34 is formed at the two corner portions where the mounting portions 34A and 34A are not provided. It is formed on the inner side.

The module substrate 36 is provided with a connector 38 for connecting the wiring W1 of the COB type LED 35 between the COB type LEDs 35. The holding plate 50 is for a connector that avoids the connector 38 at a position corresponding to the connector 38. A hole 54 is formed.
As shown in FIG. 6, the holding plate 50 is disposed between the COB type LEDs 35 with a gap δ from the module substrate 36. Further, the peripheral wall 53 is formed with a wiring hole 55 through which the wiring W1 (FIG. 8) attached to the front surface of the LED substrate 34 passes through the back surface side of the pressing plate 50, and the wiring W1 passing through the wiring hole 55 is pressed. The plate 50 is connected to the connector 38 through a gap δ on the back surface side. The connector 38 and the power source 80 are connected by a power line W2 (FIG. 2).

Although not shown in the figure, the COB type LED 35 is configured by arranging phosphors on a large number of LEDs, and emits a predetermined color mixture light by mixing the emission color of the LED and the fluorescence color of the phosphor. In the present embodiment, for example, a blue light emitting element that emits blue light is used for the LED, and a phosphor that emits, for example, yellow fluorescent light by receiving blue light is used for the phosphor. White light is obtained by mixing the blue emission color of the light emitting element and the yellow fluorescent color of the phosphor.
In the COB-type LED 35 configured in this way, light having a large emission angle with respect to the optical axis F has a long optical path length of the phosphor layer. Color unevenness occurs.

  Therefore, the peripheral wall 53 is provided with an inclined surface 56 extending from the COB-type LED 35, and this inclined surface 56 is also configured as a light diffusing reflection surface, like the lens facing surface 51 of the pressing plate 50. As a result, the light having a large emission angle with respect to the optical axis F and slightly deflected to the fluorescent color is diffusely reflected by the inclined surface 56, so that the color unevenness can be reduced while improving the light extraction efficiency.

However, if all the light biased to the fluorescent color is diffusely reflected by the inclined surface 56, the inclined surface 56 becomes large. Further, since the light reflected by the diffuse reflection surface has few specular reflection components, detailed optical design becomes difficult.
Therefore, the light having a larger emission angle with respect to the optical axis F and diffused by the fluorescent color is diffusely reflected by the inclined surface 56, and the remaining light is reflected by total reflection surfaces 68 and 69 of the lens body 39 described later. Yes. As a result, the inclined surface 56 can be made small, and a detailed optical design becomes possible.

  As described above, the lens body 39 is configured to condense in the lateral direction (width direction) of the road and to diffuse in the longitudinal direction (lane direction) in order to realize a laterally long light distribution as road illumination. ing. In the longitudinal direction, the uneven color component is also diffused and scattered far away, making it difficult to check the uneven color of the road surface. In the short-side direction, the uneven color component is also collected, so that the uneven color of the road surface can be easily confirmed.

Therefore, the opening 52 makes the light extraction range of the COB type LED 35 different in the longitudinal direction and the short direction of the road, reduces the reflection area by the pressing plate 50 in the longitudinal direction, and reflects by the pressing plate 50 in the short direction. There are many areas. Specifically, as shown in FIG. 9, the long inclined surface 56A facing the longitudinal direction has a larger angle with respect to the optical axis F (FIGS. 6 and 7) than the short inclined surface 56B facing the short direction. It is formed to become. The long inclined surface 56A and the short inclined surface 56B are formed so as to be smoothly continuous. Here, the angle between the long inclined surfaces 56A is a light extraction range α1 in the longitudinal direction, and the angle between the short inclined surfaces 56B is a light extraction range α2 in the short direction. In other words, the light extraction range α1 in the longitudinal direction (130 ° in the present embodiment) is set larger than the light extraction range α2 in the short direction (90 ° in the present embodiment). As a result, the light diffused and reflected by the holding plate 50 is reduced in the longitudinal direction, so that the light extraction efficiency can be increased. In the short direction, the light inclined to the fluorescence is sufficiently diffused by the short inclined surface 56B. Since reflection is possible, uneven color on the road surface can be reduced.
By configuring the presser plate 50 in this way, even in the simulation results, the instrument efficiency is 87% when the presser plate 50 is not provided, whereas the instrument efficiency is approximately when the presser plate 50 is provided. The instrument efficiency is improved by the holding plate 50.

Next, the lens body 39 will be described in detail.
10A and 10B are diagrams showing the lens body 39 and the COB type LED 35. FIG. 10A is a bottom view, FIG. 10B is a left side view, and FIG. 10C is a front view. FIG. 11 is a rear view showing the lens body 39 of FIG. FIG. 12 is a view showing the light source unit 25 in the XII-XII cross section of FIG. 13 is a view showing the light source unit 25 in the XIII-XIII cross section of FIG. 14 is a cross-sectional view taken along the line XIV-XIV in FIG. FIG. 15 is an explanatory diagram showing a relationship between the width of the road and the emission angle. 16A and 16B are views showing the horizontal angle of the refracting portion 60A. FIG. 16A is a cross-sectional view taken along line AA in FIG. 10, FIG. 16B is a cross-sectional view taken along line BB in FIG. ) Is a sectional view taken along the line CC in FIG. 10, FIG. 16D is a sectional view taken along the line DD in FIG. 10, and FIG. 16E is a sectional view taken along the line EE in FIG. Note that the bottom view of FIG. 10A corresponds to the bottom side of the road light 1.

  As described above, the lens body 39 is a transmissive optical element that covers the light emitting portion 35A of the COB type LED 35. As shown in FIG. 10, the lens body 39 has a center line C passing up and down the optical axis F (before and after the road lamp 1). It forms a symmetrical shape as the center, and distributes the light from the light emitting portion 35A to both the left and right sides. Specifically, the lens body 39 has an arch-shaped optical lens 60 that draws an arc so as to cross right below the light emitting portion 35A and straddle both left and right sides. A fixing portion 39A screwed to the pressing plate 50 is integrally provided. Due to the arched shape of the optical lens 60, the light from the light emitting portion 35A is distributed to the far left and right sides. In addition, since the optical lens 60 covering the light emitting unit 35A is arched, the distance to the light emitting unit 35A is increased, making it difficult to be affected by the heat generated by the light emitting unit 35A.

Here, in the case where light is controlled to be a horizontally long light distribution only by refraction, if the extraction efficiency is to be improved, the optical lens 60 is increased in size. On the other hand, if the optical lens 60 is brought close to the light emitting unit 35A in order to reduce the size, the temperature of the optical lens 60 will rise. Further, the temperature is high immediately below the COB type LED 35, and the temperature is relatively low on the side of the COB type LED 35.
Therefore, the optical lens 60 is formed by providing total reflector portions 60B and 60C on both sides of the refracting portion 60A, and the refracting portion 60A is separated from the light emitting portion 35A by a predetermined distance G (see FIG. 12). 60B and 60C are closer to the light emitting part 35A side than the refracting part 60A. Thereby, compared with the case where the optical lens 60 is formed only by the refracting portion 60 </ b> A, the optical lens 60 can be reduced in size and the temperature rise of the optical lens 60 can be suppressed.

The incident surface 61 of the optical lens 60 is formed by the incident surface 61A of the refracting portion 60A and the incident surfaces 61B and 61C of the total reflector portions 60B and 60C. The exit surface 62 of the optical lens 60 is composed of the exit surface 62A of the refracting portion 60A and the exit surfaces 62B and 62C of the total reflector portions 60B and 60C.
As shown in FIG. 11, the incident surface 61A of the refracting portion 60A has a central incident portion (top surface portion) 63A on the center line C and a plurality of left and right sides of the central incident portion 63A (in this embodiment, left and right). And two side incident portions (side portions) 63B. Each side incident part 63B is a step part extending substantially along the center line C, and as shown in FIG. 12, extends in a wave shape in a sectional view, and the incident surface 61A is formed in a stepped lens shape. Has been. By making the incident surface 61A into a stepped lens shape, the refracting portion 60A becomes thinner in the direction away from the light emitting portion 35A, and the distance from the light emitting portion 35A to the incident surface 61A of the refracting portion 60A becomes larger, so the refracting portion 60A. Can prevent thermal damage. Further, since the incident surface 61A has a stepped lens shape, the thickness of the refracting portion 60A can be reduced, and the lens body 39 can be manufactured easily and inexpensively.

However, if the incident surface 61A is formed into a stepped lens shape, a surface 63C that deviates from the design intention is formed, and unevenness in illuminance may occur on the road surface due to light incident on the surface 63C that deviates from the design intention. In particular, in the COB type LED 35, since the area of the light emitting portion 35A is large and the incident angle of the light to the optical lens 60 is not constant, there are many components incident on the surface that is not intended as the design intention. The emission peak of the COB type LED 35 is directly below.
Therefore, as shown in FIG. 11, the central incident portion 63A immediately below the light emitting portion 35A is set to a width equal to or larger than the width J of the light emitting portion 35A (more specifically, the LED mounting surface) in plan view. The light emitting portion 35A is formed to have a width substantially the same as the width J of the light emitting portion 35A and is formed on a surface as designed. As a result, the strong light of the COB type LED 35 can be incident on the central incident part 63A as designed, so that the light distribution as designed with no uneven illuminance can be realized while the optical lens 60 is made thin.

  Further, the boundary T of the side incident portion 63B is not parallel to the center line C, but is curved with a curvature such that the distance T from the center line C increases as the distance from the optical axis F increases in the front-rear direction. When the side incident part 63B extends in parallel with the center line C, the light K1 passing through the side incident part 63B is directed forward, but the side incident part 63B is curved and extended, Light K2 passing through the central incident part 63A or the side incident part 63B can be directed in the left-right direction. That is, the light traveling forward is refracted toward the optical axis F side and stored in the width direction of the road, and can be irradiated farther in the left-right direction, so that a longer horizontal light distribution can be realized.

As shown in FIG. 12, the incident surface 61A is set so that the direct light K3 of the light emitting section 35A can be incident thereon. Note that light outside the direct light K3 of the light emitting portion 35A (light having a large emission angle with respect to the optical axis F) is diffusely reflected by the inclined surface 56 of the pressing plate 50 as described above.
In the present embodiment, each side incident portion 63B is formed such that the farthest portion from the light emitting portion 35A is the reference line N, but the farthest portion is not located on the reference line N. Good.
The left and right end portions (bottom surface of the optical lens 60) 64 of the side incident portion 63B are formed in a convex shape that protrudes toward the pressing plate 50 side. Thereby, the light emitted from the end portion 64 such as the light totally reflected by the emission surface 62, the light reflected by the holding plate 50, or the light incident on the end portion 64 creates a spot-shaped irradiation portion. As a result, unevenness in illuminance on the road surface can be prevented.
The exit surface 62A of the refracting portion 60A includes a center exit portion 65A that extends back and forth at the center portion, and side exit portions 65B and 65B that are located on both the left and right sides of the center exit portion 65A. In the left-right direction, the center emitting portion 65A is formed in a concave shape, and the side emitting portions 65B and 65B are formed in a convex shape.

Further, as shown in FIG. 13, the refracting portion 60A has an incident surface 61A and an exit surface 62A formed in a convex shape in the front-rear direction, and the light from the exit surface 62A of the refracting portion 60A is slightly forward to the rear. Light distribution. Thereby, even when the instrument main body 10 is disposed not on the road shoulder but above the road, so-called overhang installation, light can be distributed to the rear of the instrument main body 10, and as a result, irradiation can be performed over the width of the road.
The refracting portion 60A is provided such that the distance L1 from the optical axis F of the front edge 66 is longer than the distance L2 from the optical axis F of the rear edge 67, and the front-rear direction (road width) The center of the direction) does not coincide with the optical axis F, and is arranged so-called offset. As a result, most of the light incident on the refracting portion 60A can be irradiated forward, so that a horizontally long light distribution can be achieved in the forward direction.

  The total reflector parts 60B and 60C are provided asymmetrically at both side edges 66 and 67 in the longitudinal direction of the refracting part 60A and include total reflection surfaces 68 and 69. The total reflection surfaces 68 and 69 are provided so as to reflect light in different directions. Specifically, the front total reflection surface 68 is set to an angle at which light traveling forward from the COB type LED 35 toward the farthest in the width direction of the road is reflected forward from substantially directly below. The rear total reflection surface 69 is set to an angle at which light traveling backward is reflected slightly rearward from the front side.

  Each of the total reflectors 60B and 60C is formed in a substantially triangular shape having a cross section having three apexes P1-P3 and Q1-Q3. Here, the apexes P1 and Q1 are defined as the incident side, and the apexes P2, P3, Q2 and Q3 are defined as the exit side. The vertices P2 and Q2 are located at the lower ends (tips) of the total reflection surfaces 68 and 69, and the vertices P3 and Q3 are located at the emission side edge of the refracting portion 60A. Here, for example, it is assumed that the vertex P4 is positioned outside the line connecting the vertices P2 and P3, and similarly, the vertex Q4 is positioned outside the line connecting the vertices Q2 and Q3. When each of the total reflectors 60B and 60C is formed in a substantially quadrangular cross section having four vertices P1-P4 and Q1-Q4, the light emitted from the refracting portion 60A is defined by the vertices P3-P4 and Q3-Q4. There is a possibility that the light enters the emission surfaces 62B and 62C of the total reflectors 60B and 60C. In the present embodiment, each of the total reflector portions 60B and 60C is formed in a substantially triangular cross section so that light emitted from the refracting portion 60A is incident on the exit surfaces 62B and 62C of the total reflector portions 60B and 60C. Can be prevented. Furthermore, since the total reflector portions 60B and 60C are formed in a substantially triangular cross section, the thickness of each of the total reflector portions 60B and 60C can be reduced, so that the lens body 39 can be manufactured easily and inexpensively. Further, in the present embodiment, each of the exit surfaces 62B and 62C is set at an angle at which the light emitted from the refracting portion 60A does not enter the exit surfaces 62B and 62C, so that the light emitted from the refracting portion 60A is emitted. It can be reliably prevented from entering the surfaces 62B and 62C.

The vertices P1 and Q1 on the incident side are set to heights H1 and H2 from the light emitting portion 35A so that the direct light K4 emitted from the edge of the light emitting portion 35A on the side closer to the vertices P1 and Q1 can be incident. ing. That is, the height H1 of the vertex P1 of the front total reflector portion 60B is set higher than the height H2 of the vertex Q1 of the rear total reflector portion 60C, and the rear total reflection surface 69 is the front side. The total reflection surface 68 is longer than the upper and lower surfaces. Note that light outside the direct light of the light emitting portion 35A (light having a large emission angle with respect to the optical axis F) is diffusely reflected by the inclined surface 56 of the pressing plate 50 as described above. In the total reflection surface 69, the direct light K4 emitted from the edge of the light emitting unit 35A on the side closer to the vertex Q1 is reflected slightly rearward, but is reflected forward as the distance from the vertex Q1 increases (for example, the light emitting unit). (See light K5 from the center of 35A).
Further, since the rear total reflection surface 69 protrudes below the front total reflection surface 68, more light traveling backward can be reflected to the front side, so that the light extraction efficiency can be improved.

  As shown in FIG. 14, the outer side surface 60C1 of the total reflector portion 60C has a concave central portion 69A in the longitudinal direction and is gently curved toward the end portion 69B. The total reflection surface 69 has a horizontal line I. With respect to the angle β. When the total reflection surface 69 is parallel to the line I in the left-right direction, the light K6 reflected by the total reflection surface 69 is directed forward. However, by forming the total reflection surface 69 with an angle β, The light K7 reflected by the reflecting surface 69 can be directed in the left-right direction. In other words, since light traveling forward can be stored in the width direction of the road and radiated further in the left-right direction, a longer horizontal light distribution can be realized. Further, by changing this angle β, a detailed optical design becomes possible. Although FIG. 14 shows the rear total reflection surface 69, the same applies to the front total reflection surface 68, so that the central portion 68A and the end portion 68B of the outer surface 60B1 of the total reflector portion 60B are Illustration is omitted.

  In addition, as shown in FIG. 12, both side edge portions 66 and 67 of the refracting portion 60A are recessed at the longitudinal center portions 66A and 67A, and are gently curved toward the end portions 66B and 67B. Are inclined at angles γ1 and γ2. That is, the ratio of light incident on the refracting section 60A and the ratio of light incident on the total reflector sections 60B and 60C are different for each cross section in the front-rear direction, and as the incident angle increases with respect to the optical axis F. The amount of light incident on the refracting portion 60A is increased. Thereby, compared with the case where both the side edge parts 66 and 67 are made parallel to the line I of the left-right direction, since it can irradiate back, it can respond to overhang installation. In addition, by changing the angles γ1 and γ2, detailed optical design becomes possible.

Here, in the horizontal light distribution, as shown in FIG. 15, the emission angle θ1 up to the road width of the road R just below the light emitting portion 35A and the emission angle θ2 up to the road width in the distance are different in plan view, The emission angle decreases as the distance increases.
Therefore, as shown in FIG. 16, the refracting portion 60A has a different cross-sectional shape in each cross section with the center of the light emitting portion 35A as a reference, and more specifically, the edge portions 66, The angle of the line M connecting 67 is different. As shown in FIG. 16A, the line M just below the light emitting portion 35A is distributed forward by tilting the front side upward, and as the angle with respect to the optical axis F increases, FIG. As shown in FIG. 16 (E), the front side is inclined downward to distribute light laterally or backward. Thereby, since it can distribute light horizontally according to a road, an illumination rate can be made high. Moreover, since it can irradiate back, it can respond to overhang installation. Furthermore, detailed optical design is possible by changing the angle of the line M.

  As described above, according to this embodiment, since the plurality of side incident portions 63B are provided in a wave shape, the thickness of the lens body 39 can be reduced. In addition, since the central incident portion 63A immediately below the COB type LED 35 has a width equal to or larger than the width J of the COB type LED 35, the strong light of the COB type LED 35 can be distributed as designed and incident on the surface 63C that is out of the design intention. Illuminance unevenness can be prevented by reducing the amount of light to be emitted. Furthermore, since the central incident portion 63A and the plurality of side incident portions 63B are curved, the light K2 can be refracted to the optical axis F side, so that the light can be distributed horizontally.

  In addition, according to the present embodiment, the boundary T of the side incident part 63B is configured to be symmetrically curved with the central incident part 63A sandwiched in plan view, so that light is distributed symmetrically horizontally with the central incident part 63A sandwiched therebetween. it can.

However, the above-described embodiment is an aspect of the present invention, and it is needless to say that the embodiment can be appropriately changed without departing from the gist of the present invention.
For example, in the above-described embodiment, the pressing plate 50 is provided, but the pressing plate 50 may be omitted. In this case, the light emitting portions are arranged such that the apexes P1 and Q1 on the incident side of the total reflectors 60B and 60C can receive the direct light K4 emitted from the edge of the light emitting portion 35A on the side closer to the apexes P1 and Q1. The heights H1 and H2 from 35A may be set.

  In the above-described embodiment, the total reflector portions 60B and 60C are provided in the optical lens 60. However, the total reflector portions 60B and 60C may be omitted or replaced with the total reflector portions 60B and 60C. A reflecting mirror may be provided.

  In the above-described embodiment, the total reflector portions 60B and 60C are formed to have a substantially triangular cross section, thereby preventing light emitted from the exit surface 62A of the refracting portion 60A from entering the total reflector portions 60B and 60C. Was. However, the shape of the total reflectors 60B and 60C is not limited to a substantially triangular cross section as long as it can prevent such re-incident. Further, for example, as shown in FIGS. 17 and 18, notches 91 and 92 may be provided in a part of the emission surface 62B of the front-side total reflector part 60B formed in a substantially triangular cross section. Thereby, since the light reflected by the total reflection surface 68 of the total reflector part 60B can be oriented further forward, the light amount directly below can be suppressed, and the horizontally long light distribution in the front can be realized without uneven illuminance. In the example of FIGS. 17 and 18, notches 91 and 92 are provided in a part of the exit surface 62B of the front total reflector 60B, but the exit surface 62C of the rear total reflector 60C. A notch part may be formed in a part of. 17 and 18, the same parts as those of the lens body 39 shown in FIG.

  Moreover, this invention is applicable not only to a road lamp but arbitrary lighting fixtures, such as a street lamp, for example. In addition, the present invention can be applied to a lighting fixture that is supported by a wall of a building, for example, without limiting the fixture body to a support.

1 road lights (lighting fixtures)
35 COB type LED (light emitting device)
35A Light Emitting Unit 39 Lens Body (Optical Lens Device)
60 Optical lens 60A Refraction part 61A Incident surface 63A Central incident part (top surface part)
63B Side incident part (side part)
F boundary R width

Claims (4)

A refraction part that traverses directly under the light emitting element, and an incident surface of the refraction part that faces the light emitting element is curved with a width equal to or larger than the width of the light emitting element in a cross-sectional view and extends in the front-rear direction. A surface portion, and a plurality of side surface portions that are curved and extended in a cross-sectional view on both sides of the top surface portion ,
A line connecting the front edge and the rear edge of the incident surface in the front-rear direction, the front side is inclined immediately below the light emitting element, and the front side is lowered as the angle with respect to the optical axis of the light emitting element increases. An optical lens device that is tilted .   2. The optical lens device according to claim 1, wherein the boundary between the side surfaces is curved symmetrically across the top surface in plan view.   Each of the front edge and the rear edge is curved forward as it goes from the central portion in the left-right direction to the end portion, and is inclined with respect to the line in the left-right direction. The optical lens device according to claim 1 or 2.   A lighting fixture comprising the optical lens device according to claim 1.

Images