TWI410677B - Optical lens - Google Patents

Abstract

The invention discloses an optical lens for a light-emitting device. The optical lens includes a translucent body which has a concave inner surface to which light is incident. The inner surface includes a first region and a second region opposite to the first region. The first region and the second region are both substantially straight planes and extend inclinedly from the edge of the inner surface to the center of the inner surface respectively, so as to connect with each other. Thereby, the optical lens of the invention is capable of contributing to an elliptic light field.

Description

optical lens

The present invention relates to an optical lens, and more particularly to an optical lens for use in a light-emitting element.

The lighting characteristics of street lamps will affect the line of sight of the road users at night. Therefore, governments of all countries have relevant regulations on the illumination and structure of street lamps to protect the safety of road users. For the light source, a light-emitting diode has been used as a light source for the street light. Generally, the package structure of the light-emitting diode is disposed in the lamp cover of the street lamp, wherein the peripheral cover of the light-emitting diode is provided with an optical lens for refracting the light emitted by the light-emitting diode to form a light as shown in FIG. Show the light field 12. In the prior art, the optical field 12 formed by the optical lens falls in the direction of the central optical axis of the lens, and the optical field is bilaterally symmetric.

Since the light field formed by the conventional optical lens only falls in the direction of the central optical axis of the lens, in order to project the light field onto the road surface to provide illumination for the user, the lamp cover 10 of the street lamp 1 is usually designed to be uplifted. With the central optical axis of the lens facing the road surface, the light field can be projected onto the road surface. Please refer to Figure 1. FIG. 1 is a schematic diagram of a street lamp 1 in the prior art.

However, when the lampshade 10 is tilted up, it will directly look at the light-emitting surface of the streetlight, so that the light emitted by the streetlight 1 is prone to glare when the user drives on the road, which is really safe for road safety. Therefore, the conventional street lamps still need to be improved in terms of the road safety of the road users to comply with relevant regulations.

One aspect of the present invention is to provide an optical lens for use in a light-emitting element. In practical applications, the optical lens of the present invention can be used in conjunction with a light emitting diode.

According to an embodiment of the invention, the optical lens comprises a light transmissive body, and the light transmissive body has an inner surface that is recessed by one of the incident light rays. For example, the inner surface of the recess can be incident on the light emitted by the light emitting diode. In addition to the inner surface of the recess, the light transmissive body has an outer surface surrounding an inner surface of the recess, and further the surface may be a circular arc surface.

For the surface morphology, the inner surface of the recess includes a first region and a second region opposite to the first region. It should be noted that the first region and the second region are both near straight surfaces. . Further, the first region extends obliquely from the edge line of the inner surface to the center of the inner surface, and the second region also extends obliquely from the edge line of the inner surface to the center of the inner surface and is connected to the first region.

In one embodiment, the center of the inner surface is a flat region having two sides opposite to each other, and the first region and the second region extend obliquely from the edge line of the inner surface to the flat region. And respectively connected to the two sides of the flat area.

In another embodiment, the center of the inner surface is a ridge line, and the first region and the second region extend obliquely from the edge line of the inner surface to the ridge line. In addition, the outline of the inner surface of the recess generally presents a triangle from a first cross-sectional view of the light-transmitting body toward a first direction, wherein the first direction extends toward one of the ridge lines. Further, in this embodiment, the space in the inner surface of the recess has a substantially triangular column shape.

It should be noted that the inner surface of the recess defines a first edge portion, a central portion and a second edge portion along the first direction, and the first edge portion and the second edge Part of each other is opposite to each other across the central portion.

An inner surface of the recess that presents a triangular outline from the first cross-sectional view, and a dimension of the triangular outline located in the first edge portion gradually becomes larger as it approaches the central portion, and is located in the second edge portion The size of the triangular outline also becomes larger as it approaches the central portion, and the size of the triangular outline located in the central portion remains unchanged.

It should be particularly noted that, when the light emitted by the LED is incident on the first region and the second region in the inner surface of the recess, the first region and the second region can refract incident light. The refracted light is further offset from the optical axis of the optical lens.

Excluding the first region and the second region, the inner surface of the recess includes a third region and a fourth region opposite to the third region, the third region and the fourth region being individually associated with the first region The area and the second area are connected. In an embodiment, the third area is a surface of a circular arc and extends from the edge line of the inner surface to a center of the inner surface, and the fourth area is also a surface of the circular arc and the inner surface is The edge line extends to the center of the inner surface.

In addition, the outline of the inner surface substantially presents a trapezoidal shape when viewed from a second cross-sectional view of the light-transmitting body toward a second direction. It should be noted that the first direction is perpendicular to the second direction and the second cross-sectional view is viewed from the center of the inner surface toward the second direction.

It should be particularly noted that, when the light emitted by the light emitting diode is incident on the third region and the fourth region in the inner surface of the recess, the traveling direction of the incident light can be substantially maintained. Since the first region and the second region can refract incident light rays more away from the optical axis of the optical lens, and the third region and the fourth region can keep the traveling direction of the incident light unchanged, the light is emitted. The light emitted by the diode passes through the optical lens of the present invention to produce an elliptical light field.

It should be noted that in another embodiment, the third region is a nearly straight surface and extends obliquely from the edge line of the inner surface to a center of the inner surface, and the fourth region is a surface of a circular arc. And extending obliquely from the edge line of the inner surface to the center of the inner surface.

In one embodiment, the optical lens of the present invention further includes a mount, and the function of the mount is to fix the optical lens to the package structure of the light emitting diode. The fixing base is connected to one of the transparent bodies of the optical lens, and the fixing seat itself has a through fixing hole, and the fixing hole can be used for a fixing member to pass through. In practice, the fixing hole can be a screw hole. In terms of material selection, the mount can be made of a light transmissive material like the light transmissive body. In addition, the fixing seat is integrally formed with the light-transmitting system.

The advantages and spirit of the present invention will be further understood from the following detailed description of the invention.

It is a scope of the invention to provide an optical lens for use in a light-emitting element. In practical applications, the optical lens of the present invention can be used in conjunction with a light emitting diode to generate a specific light field.

Please refer to Figure 2A and Figure 3A to Figure 3C. 2A is a perspective perspective view of an optical lens 2 in accordance with an embodiment of the present invention. FIG. 3A is a cross-sectional view of the optical lens 2 as seen from a section line B-B of FIG. 2A in a first direction X1. FIG. 3B is a cross-sectional view of the optical lens 2 as seen from a section line C-C of FIG. 2A in a first direction X1. FIG. 3C is a cross-sectional view of the optical lens 2 as seen from the section line A-A of FIG. 2A in the second direction X2. It should be noted that the first direction X1 is perpendicular to the second direction X2.

As shown in Fig. 2A, the optical lens 2 comprises a light-transmissive body 23, and the light-transmitting body 23 has an inner surface 20 which is recessed by one of the incident light rays. For example, the optical lens 2 can be disposed on the light emitting diode such that the inner surface 20 of the recess can receive light incident from the light emitting diode. In addition to the recessed inner surface 20, the light transmissive body 23 has an outer surface 21 surrounding the inner surface 20 of the recess, and further the surface 21 can be a circular arc surface.

The inner surface 20 of the recess includes a first region 200, a second region 201, a third region 202, and a fourth region 203, wherein the second region 201 is opposite to the first region 200, and the fourth region 203 and the third region Area 202 is opposite. The third area 202 is located on one side of the second area 201 and the first area 200, and the fourth area 203 is located on the other side of the second area 201 and the first area 200, and the third area 202 and the fourth area 203 are individually The first area 200 and the second area 201 are connected to each other.

It should be noted that the first region 200 and the second region 201 are both near-flat surfaces for surface morphology. As shown in FIG. 2A, the first region 200 extends obliquely from the edge line 205 of the inner surface 20 to the center 204 of the inner surface 20, and the second region 201 also extends obliquely from the edge line 205 of the inner surface 20 to the inner surface 20. The center 204 is connected to the first area 200. In addition, in the embodiment shown in FIG. 2A, the center of the inner surface 20 is a ridge line, and the first region 200 and the second region 201 extend obliquely from the edge line 205 of the inner surface 20 to the ridge line. It should be noted that the first direction X1 extends toward one of the ridge lines.

In addition, from the cross-sectional view of the light-transmitting body toward the first direction X1, the outline of the inner surface substantially presents a triangle, as shown in FIG. 3A and FIG. 3B. Further, in this embodiment, the space in the inner surface 20 of the recess has a substantially triangular prism shape.

It should be noted that, from the cross-sectional view shown in FIG. 3C, the inner surface 20 of the recess defines a first edge portion E1, a central portion C and a second edge portion along the first direction X1. Part E2, wherein the first edge portion E1 and the second edge portion E2 are opposed to each other across the central portion C. Fig. 3C is a cross-sectional view as seen from the center of the inner surface of the light transmitting body 23 in the second direction X2. Again, as shown in Figure 3C, the contour of the inner surface 20 generally presents a trapezoidal shape.

It should be noted in this embodiment that when the concave inner surface 20 of the triangular contour is presented in a cross-sectional view at different positions in the first direction X1, the size of the triangular contour located in the first edge portion E1 is close to The central portion C gradually becomes larger, and the size of the triangular contour in the second edge portion E2 also becomes larger as it approaches the central portion C, and the size of the triangular contour in the central portion C remains unchanged. . Taking FIG. 3B as an example, a cross-sectional view from the first edge portion E1 and looking toward the first direction X1 is shown. The size of the triangular contour in FIG. 3B is compared with FIG. 3A (from the central portion C toward the inside) The cross-sectional view seen in the first direction X1 is small, and is known from the outline of the third region 202. In the cross-sectional view seen from the first edge portion E1 toward the first direction X1, the size of the triangular contour will follow The cross-sectional view gradually becomes larger as the central portion C approaches.

It should also be noted that the cross-sectional view of FIG. 3A is viewed from the central optical axis S of the light-transmitting body 23 toward the first direction X1, and wherein the triangular outline has linear sides, as indicated by reference numerals 200 and 201. In contrast, the cross-sectional view of FIG. 3B is viewed from the first edge portion E1 of the light-transmitting body 23 toward the first direction X1, but wherein the triangular outline has curved sides as indicated by reference numerals 200, 201.

For the third region 202 and the fourth region 203, in this embodiment, the third region 202 is a surface of a circular arc and extends from the edge line 205 of the inner surface 20 to the center 204 of the inner surface 20, and the fourth region 203 is also a circular arc surface and extends from edge line 205 of inner surface 20 to center 204 of inner surface 20.

Please refer to Figure 7A. FIG. 7A is a schematic view showing a light field generated by the optical lens 2 of FIG. 2A.

It should be particularly noted that after the light L emitted by the LED 3 is incident on the first region 200 and the second region 201 in the inner surface 20 of the recess, the first region 200 and the second region 201 may be incident. The light ray L is refracted and the refracted light L is further deviated from the optical axis S of the optical lens 2.

In contrast, when the light L emitted by the light-emitting diode 3 is incident on the third region 202 and the fourth region 203 of the surface having the circular arc in the inner surface 20 of the recess, the traveling direction of the incident light L is basically It can remain unchanged. Since the first region 200 and the second region 201 can refract the incident light L more away from the optical axis S of the optical lens 2, the third region 202 and the fourth region 203 can keep the traveling direction of the incident light L unchanged. Therefore, the light L emitted from the light-emitting diode 3 passes through the optical lens 2 of the present invention to generate an elliptical light field 4, wherein the light L refracted through the first region 200 and the second region 201 can be Both ends of the elliptical light field 4 generate a concentrated light field 40, which is located at a specific depression angle on both sides of the light-emitting diode 3 (as the inclination angles of the first region 200 and the second region 201 change) in the direction of the line of sight.

Please refer to Figure 2B, Figure 3D and Figure 3E. 2B is a perspective perspective view of an optical lens 2' in accordance with another embodiment of the present invention. Figure 3D is a cross-sectional view of the optical lens 2' as seen from the section line B-B of Figure 2B in a first direction X1. Figure 3E is a cross-sectional view of the optical lens 2' as seen from the section line C-C of Figure 2B in a first direction X1.

Compared with FIG. 2A, in this embodiment, the center 204 of the inner surface 20 is a flat area, and the flat area has two sides (2040, 2042) opposite to each other, and the first area 200 and the second area 201 The edge line 205 of the inner surface extends obliquely to the flat area and is respectively connected to the two sides of the flat area. Further, as shown in FIG. 3E, in a cross-sectional view as seen from the central portion of the inner surface (as defined in FIG. 3C) toward the first direction X1, the inner surface contour also has curved sides, such as labels. 200, 201 shown.

Please refer to Figure 5 and Figure 6. 5 is a perspective perspective view of an optical lens 2" according to another embodiment of the present invention. FIG. 6 is a cross-sectional view of the optical lens 2" seen from a section line A-A of FIG. 5 toward a second direction X2.

As shown in FIG. 6, it should be noted in this embodiment that the third region 202' is a nearly straight surface and extends obliquely from the edge line 205 of the inner surface 20 to the center 204 of the inner surface 20, the fourth region 203 Then, as shown in FIG. 2A, the surface of the circular arc extends obliquely from the edge line 205 of the inner surface 20 to the center 204 of the inner surface 20. Further, a cross-sectional view of the optical lens 2" as seen from the section line B-B in the first direction X1 is also shown in FIG.

Please refer to Figure 7B. Figure 7B is a schematic diagram showing the light field generated by the optical lens 2" of Figure 5.

As described earlier, the light L emitted from the light-emitting diode 3 passes through the optical lens 2 of FIG. 2A to generate an elliptical light field 4, but due to the optical lens 2 of FIG. 5, the third region of the inner surface thereof 202' is a nearly flat surface and is located on one side of the first region 200 and the second region 201, so the third region 202' can refract the incident light L more away from the optical axis of the optical lens and make the elliptical light field 4 is offset to the side of the third region 202' to create an elliptical light field 4'. It is noted that the offset may vary with the tilt angle of the third region 202'.

Please refer to Figure 8. 8 is a schematic diagram showing a light field 4' generated by the street lamp 5 of the optical lens 2" of FIG. 5. As shown in FIG. 8, the light L emitted from the LED 3 can be refracted by the optical lens 2". The elliptical light field 4' is obliquely projected onto the road, so that the lamp cover 50 of the street lamp 5 can provide the driver's road surface illumination without lifting up, to avoid the occurrence of glare.

Please refer to Figure 4. FIG. 4 is a perspective view of the optical lens 2 of the present invention further including a fixing base 22 for fixing the optical lens to the package structure of the light emitting diode. The fixing base 22 is coupled to the periphery of the light transmitting body 23 of the optical lens, and the fixing seat 22 itself has at least one through fixing hole 220, and the fixing hole 220 can be used for a fixing member to pass through. In practice, the fixing hole 220 can be a screw hole, allowing the screw to pass through the packaging structure that fixes the optical lens to the light emitting diode. In terms of material selection, the mount 22 can be made of a light transmissive material like the light transmissive body 23. In addition, the fixing seat 22 and the light transmitting body 23 can be integrally formed.

The features and spirit of the present invention will be more apparent from the detailed description of the preferred embodiments. On the contrary, the intention is to cover various modifications and equivalents within the scope of the invention as claimed.

1. . . Street light

10. . . lampshade

12. . . Light field

2, 2', 2"... optical lens

20. . . The inner surface

twenty one. . . The outer surface

twenty two. . . Fixed seat

twenty three. . . Light-transmitting body

200. . . First area

201. . . Second area

202, 202'. . . Third area

203. . . Fourth area

204. . . central

205. . . Edge line

220. . . Fixed hole

2040, 2042. . . Side

3. . . Light-emitting diode

4, 4'. . . Oval light field

40, 40'. . . Concentrated light field

5. . . Street light

50. . . lampshade

X1. . . First direction

X2. . . Second direction

E1. . . First edge part

C. . . Central part

E2. . . Second edge part

L. . . Light

S. . . Optical axis

A-A, B-B, C-C. . . Section line

FIG. 1 is a schematic diagram of a street lamp in the prior art.

2A is a perspective, perspective view of an optical lens in accordance with an embodiment of the present invention.

2B is a perspective perspective view of an optical lens in accordance with another embodiment of the present invention.

Figure 3A is a cross-sectional view of the optical lens as seen from the section line B-B of Figure 2A in a first direction.

Figure 3B is a cross-sectional view of the optical lens as seen from the section line C-C of Figure 2A as seen in a first direction.

Figure 3C is a cross-sectional view of the optical lens as seen from the section line A-A of Figure 2A in a second direction.

Figure 3D is a cross-sectional view of the optical lens as seen from the section line B-B of Figure 2B in a first direction.

Figure 3E is a cross-sectional view of the optical lens as seen from a section line C-C of Figure 2B in a first direction.

FIG. 4 is a perspective view showing the optical lens of the present invention further including a fixing base.

Figure 5 is a perspective, perspective view of an optical lens in accordance with another embodiment of the present invention.

Figure 6 is a cross-sectional view of the optical lens as seen from the section line A-A of Figure 5 in a second direction.

FIG. 7A and FIG. 7B respectively show schematic diagrams of light fields generated by the optical lenses of FIGS. 2A and 5.

Figure 8 is a schematic diagram showing the light field generated by the street lamp of the optical lens of Figure 5.

2. . . optical lens

20. . . The inner surface

twenty one. . . The outer surface

twenty three. . . Light-transmitting body

200. . . First area

201. . . Second area

202. . . Third area

203. . . Fourth area

204. . . central

205. . . Edge line

X1. . . First direction

X2. . . Second direction

A-A, B-B, C-C. . . Section line

Claims (6)

An optical lens for use in a light-emitting element, the optical lens comprising: a light-transmissive body having an inner surface recessed by a light incident, the inner surface comprising a first region and a first surface opposite the first region a second region, the first region and the second region are near-flat surfaces and respectively extend obliquely from an edge line of the inner surface to a center of the inner surface, the inner surface comprising a third region and a third region opposite to a fourth region, the third region and the fourth region being individually connected to both the first region and the second region, the third region being a surface of a circular arc and the edge from the inner surface The wire extends to the center of the inner surface, the fourth region being the surface of the arc and extending from the edge line of the inner surface to the center of the inner surface. The optical lens of claim 1, wherein the light transmissive body has an outer surface surrounding the inner surface, and the outer surface is a circular arc surface. The optical lens of claim 1, further comprising: a fixing base connected to a periphery of the light transmitting body, the fixing seat itself having a through fixing hole for a fixing member to pass through. The optical lens of claim 3, wherein the fixing hole is a screw hole. The optical lens of claim 3, wherein the mount is made of a light transmissive material. The optical lens of claim 3, wherein the fixing base is integrally formed with the light transmissive system.