TWM502800U - Optical lens - Google Patents

Description

optical lens

The present invention relates to optical components, and more particularly to an optical lens for providing a particular light intensity distribution.

A light-emitting diode is a semiconductor light source that is a semiconductor element that converts electrical energy into light energy to achieve a light-emitting effect. The light-emitting effect of the light-emitting diode is generated by applying a current to a compound semiconductor composed of a P-type semiconductor and an N-type semiconductor to recombine (or combine) electrons and holes at the junction of the P-type semiconductor and the N-type semiconductor. Since the light-emitting diode is a semiconductor that is combined with natural radiation by electrons and holes, it is not easy to generate heat during operation. Therefore, compared with the general incandescent light bulb, there is no problem of filament light-emitting, heat deposition, light decay, etc. 60,000 to 100,000 hours, more than 10 times the life of incandescent bulbs.

Secondly, the light-emitting diode uses a cold light source, which has small glare and no radiation. It does not produce harmful substances during use, and does not contain mercury. It has better environmental benefits than incandescent bulbs and is a typical green illumination source.

In addition, the operating voltage of the LED is low, and the DC driving method is adopted. The ultra-low power consumption and the electro-optical power conversion are close to 100%, and the energy saving of the incandescent bulb is more than 80% under the same lighting effect.

Based on the above advantages, light-emitting diodes have been widely used in displays, homes, automobile lights, indoor and outdoor lighting. However, the light emitting diode only emits in a specific direction Light is emitted, not in all directions, and its orientation angle is typically about 120 degrees. Compared with existing outdoor lighting devices that emit light in all directions, the light distribution characteristics of the light emitting diodes are very different, and thus the light emitting diodes have limitations for use in outdoor lighting devices.

Generally, large outdoor advertising billboards mainly display light sources on one side or opposite sides to illuminate the advertising layer. However, since the azimuth of the light emitting diode is only about 120 degrees, and the light distribution characteristics are not as good as conventional to provide a light source. To illuminate the advertising layer's projection lights, the advertising layer cannot be effectively illuminated.

Therefore, when the light-emitting diode is applied to an illumination source as an outdoor large-sized billboard, or in other markets, it is not necessary to pass the secondary lens to guide the light emitted from the LED to a desired azimuth.

One aspect of the present disclosure is to provide an optical lens for improving the azimuth of light emitted by an optical element while fabricating a cut-off line.

According to an embodiment of the present invention, an optical lens includes a first side surface, a second side surface, a light exit surface, a bottom surface, and a groove, the first side surface being opposite to the second side surface, the first side surface, and the first side surface The two side surfaces are configured such that the optical lens rotates asymmetrically with respect to its central axis. The light emitting surface is connected to the first side surface and the second side surface, and the bottom surface is opposite to the light emitting surface, and connects the first side surface and the second side surface.

The groove is formed on the bottom surface and extends toward the light exiting surface. The groove is formed by the inner wall and the side wall. The inner wall has a predetermined angle obliquely connecting the side wall, so that the side wall has a first depth and a second depth, the first depth Greater than the second depth, the sidewall has a first depth One side of the degree corresponds to the first side surface, and one side of the side wall having the second depth corresponds to the second side surface.

Thereby, the light emitted by the light-emitting element is refracted by the inner wall after passing through the optical lens, and total internal reflection occurs on the first side surface and the second side surface, so that the light is offset from the optical axis toward the optical lens. The light exiting surface in one direction of the second side surface is emitted.

Further, the first side surface has a first curvature, the second side surface has a second curvature, and the second curvature may be greater than the first curvature; of course, the second curvature may also be equal to or smaller than the first curvature. The depth of the groove may be 30 to 70% of the thickness of the optical lens; and the predetermined angle may be between 1 and 45 degrees. Moreover, the optical lens may further include a convex portion formed on the light-emitting surface, the convex portion protruding from the light-emitting surface in a direction opposite to the bottom surface, and the convex portion is located in a projection range of the groove on the light-emitting surface. The shape of the convex portion is a circular shape in a plan view of the optical lens, and the outer diameter of the concave portion is gradually reduced from the bottom surface toward the light exit surface.

1, 1a, 1b‧‧‧ optical lens

10‧‧‧Glossy

100‧‧‧ convex

12‧‧‧ bottom

14‧‧‧First side surface

15‧‧‧Second side surface

16‧‧‧ Groove

160‧‧‧ inner wall

162‧‧‧ side wall

3‧‧‧Lighting elements

A‧‧‧ center axis

H1‧‧‧first depth

H2‧‧‧second depth

I‧‧‧ optical axis

P‧‧‧ plane

θ 1, θ 2, θ 3‧‧‧ predetermined angle

1 is a perspective view of an optical lens according to a first embodiment of the present invention.

2 is a plan view of the optical lens of the first embodiment of the present invention.

3 is a cross-sectional view of the optical lens of the first embodiment of the present invention.

4 is another cross-sectional view of the optical lens of the first embodiment of the present invention.

Fig. 5 is a view showing a light intensity distribution of an optical lens corresponding to the first embodiment of the present invention.

Figure 6 is a cross-sectional view of the optical lens of the second embodiment of the present invention.

Fig. 7 is a view showing a light intensity distribution of an optical lens corresponding to the second embodiment of the present invention.

Figure 8 is a cross-sectional view showing the optical lens of the third embodiment of the present invention.

Fig. 9 is a view showing a light intensity distribution of an optical lens according to a third embodiment of the present invention.

Figure 10 is a schematic view showing the use of the optical lens of the present invention.

The above and other objects, features, and advantages of the present invention will be better understood from the following description of the preferred embodiments.

1 , 2 and 3 are respectively a perspective view, a plan view and a cross-sectional view of the optical lens according to the first embodiment of the present invention. The optical lens 1 is adapted to be disposed on the light-emitting element 3, thereby improving the azimuth of the light emitted by the optical element 3, so that the light has a special light intensity distribution. The light-emitting element 3 has an optical axis I, and the light-emitting element 3 can be, for example, but not limited to, a light emitting diode (LED). It should be noted that the number of the light-emitting diodes may be one or more, and the shape may be a light-emitting diode or a light-emitting diode die in a surface package form. The optical lens 1 is made of a light-transmitting material such as glass or a resin material.

The light-emitting surface 10, the bottom surface 12, the first side surface 14, and the second side surface 15, the bottom surface 12 is opposite to the light-emitting surface 10, and the bottom surface 12 is designed to be a flat surface. The first side surface 14 and the second side surface 15 are oppositely disposed and respectively connected to the light surface 10 and the bottom surface 12. The first side surface 14 has a first curvature, and the second side surface 15 has a second curvature. In the embodiment, the second curvature is greater than the first curvature. In actual implementation, the first curvature and the second curvature are designed as the first The curvature is less than the second curvature, or the first curvature is equal to the second curvature. The first side surface 14 and the second side surface 15 are configured such that the optical lens 1 rotates asymmetrically with respect to its central axis A.

The optical lens 1 further includes a recess 16 formed on the bottom surface 12 and recessed toward the light exit surface 10, and the recess 16 has a depth of 30 to 70% of the thickness of the optical lens 1. The light-emitting element 3 is housed in the recess 16 for projecting light toward the optical lens 1. The shape of the groove 16 is circular in view of the angle of view of the optical lens 1. The optical axis I of the light-emitting element 3 coincides with the central axis A of the optical lens 1.

3 is a cross-sectional view taken along the first axial direction X of the optical lens shown in FIG. 2. This cross section coincides with the optical axis I of the light-emitting element 3, and the first axial direction X is perpendicular to the optical axis I. The outer diameter of the recess 16 is gradually reduced from the bottom surface 12 toward the light exit surface 10, and the recess 16 includes an inner wall 160 and a side wall 162. The inner wall 160 has a predetermined angle θ 1 obliquely connecting the side walls 162 such that the side wall 162 shown in the right half of the figure has a first depth H1, and the side wall 162 shown in the left half of the figure has a second depth H2, the first depth H1 being greater than the first The depth H2 is such that the shape of the groove 16 in the first axial direction X is a quadrangle that is asymmetric with respect to the optical axis I. Wherein, the first depth H1 refers to the longest distance between the inner wall 160 and the bottom surface 12, and the second depth H2 refers to the shortest distance between the inner wall 160 and the bottom surface 12; the predetermined angle θ 1 is between 1 and 45 degrees In the present embodiment, the predetermined angle θ 1 is 10 degrees.

Furthermore, the side wall 162 has a first depth H1 side disposed corresponding to the first side surface 14, and the side wall 162 has a second depth H2 side disposed corresponding to the second side surface 15, whereby the shape of the optical lens 1 is made The profile in the first axial direction X is asymmetrical to the optical axis I.

Referring to FIG. 5, a light intensity distribution diagram of the optical lens of the first embodiment of the present invention is shown. In FIG. 5, when measuring the light distribution curve of the light passing through the optical lens 1, the light-emitting element 3 is disposed at a center position shown in the drawing, and the light-emitting element 3 and the optical lens 1 are oriented in the direction of 0 degrees in the figure, and are illuminated. The optical axis I of the element 3 coincides with 0 degrees in the figure, and one side of the side wall 162 having the second depth H2 is correspondingly disposed on the lower side of FIG. In FIG. 5, the light distribution curve L1 is used to indicate the light intensity of the light passing through the optical lens 1 in the first axial direction X. The cloth, the light distribution curve L2 is used to indicate the light intensity distribution of the light passing through the optical lens 1 in the second axial direction Y.

It can be seen from the light distribution curve L1 that the light emitted by the light-emitting element 3 mainly converges on the left side of the optical axis I by about 15 degrees, and in practice, the angle can be between 5 and 40 degrees. It is to be noted that when the light emitted by the light-emitting element 3 enters the optical lens 1 and is transmitted to the first side surface 14, the first side surface 14 serves to direct the light toward the left side of the optical axis I by 15 degrees (full The reflection is then emitted by the light exit surface 10. When the light emitted from the light-emitting element 3 enters the optical lens 1 and is transmitted to the second side surface 15, it is totally reflected toward the surface 14 and then emitted from the light-emitting surface 10.

Secondly, when the light emitted by the optical element 1 passes through the inner wall 160, the inner wall 160 is obliquely connected to the side wall 162, so that part of the light passing through the side wall 162 is transmitted toward the second side surface 15, and the other part passes through the side wall 160. The light is refracted and then exits to the exit surface 10, so that the light is distributed in the direction of 0 to 90 degrees to the left of the optical axis I, and the light that falls on the right side of the optical axis I is reduced, thereby creating a cut-off line.

4 is a cross-sectional view taken along the second axial direction Y of the optical lens shown in FIG. 2. This profile also coincides with the optical axis I of the illuminating element, the second axial direction Y being perpendicular to the first axial direction X, and the second axial direction Y being the same perpendicular to the optical axis I. The shape of the groove 16 in the second axial direction Y is a quadrangle symmetrical to the optical axis I, and at the same time, the shape of the optical lens 1 is symmetric with respect to the optical axis I of the first axial direction Y.

Referring to FIG. 5, it can be seen from the light distribution curve L2 that the curved surface of the optical lens 1 symmetrically distributed on the Y-axis section causes the light-emitting angle of the light of the second axial direction to fall on the two sides of the optical axis I by about 30 degrees. The light rays which are emitted from about 20 degrees on both sides of the optical axis I are substantially uniformly distributed.

Referring to FIG. 1 and FIG. 2 , the optical lens 1 further includes a convex portion 100 formed on the light-emitting surface 10 and located in a projection range of the groove 16 on the light-emitting surface 10 . The convex portion 100 protrudes in a direction opposite to the bottom surface 12, thereby adjusting the azimuth angle of the light passing therethrough; the convex portion 100 has a circular shape from the viewpoint of the viewing angle of the optical element 1.

In summary, the light emitted by the light-emitting element 3 passes through the optical lens 1 and refracts light through the inner wall 160, and the first side surface 14 and the second side surface 15 generate total internal reflection light, which makes the light large. A part of the light is shifted toward the light-emitting surface 10 of the optical lens 1 having the second side surface 15 in one direction.

Referring to FIG. 6, a cross-sectional view of an optical lens according to a second embodiment of the present invention is shown. Figure 6 is a cross-sectional view taken along the first axial direction X of the optical lens shown in Figure 2. The optical lens 1a shown in Fig. 6 is similar to the optical lens 1 of the first embodiment, and the same elements are denoted by the same reference numerals. It is to be noted that the difference between the two is that the inner wall 160 of the optical lens 1a shown in FIG. 6 has a predetermined angle θ 2 obliquely connected to the side wall 162 such that the side wall 162 has a first depth H1 and a second depth H2, the first depth H1 is greater than the second depth H2, the predetermined angle θ 2 is 20 degrees; the first depth H1 is the longest distance between the inner wall 160 and the bottom surface 12, and the second depth H2 is the shortest distance between the inner wall 160 and the bottom surface 12 .

When the light emitted from the optical element 1a passes through the inner wall 160, the inner wall 160 is obliquely connected to the side wall 162, and the amount of light transmitted in the direction of the second side surface 15 is reduced, so that most of the light is refracted by the inner wall 160. It enters the optical element 1a and diverge from the left side of the optical axis I by 0 to 90 degrees. Next, when the light emitted from the light-emitting element 3 enters the optical lens 1a and is transmitted to the first side surface 14, the first side surface 14 is directed toward the left side of the optical axis I by 15 degrees by total internal reflection (all). The reflection is then emitted by the light exit surface 10. The light emitted by the light-emitting element 3 enters the optical lens 1a via When the inner wall 162 is transmitted to the second side surface 15, it is totally reflected toward the left side of the optical axis I, and then emitted by the light exit surface 10. Thereby, the light is concentrated in the direction of the left side of the optical axis I by about 15 degrees, as shown by the light distribution curve L1 shown in FIG.

In addition, as can be seen from the light distribution curve L2, the light exiting angle of the light passing through the second axial direction Y of the optical lens 1a falls in a direction of about 25 degrees on each side of the optical axis I, and about 15 degrees on each side of the optical axis I. The light that exits between them is roughly uniform. The function and related description of each element of the optical lens 1a are substantially the same as those of the optical lens 1 of the first embodiment, and will not be described herein. The optical lens 1a can at least achieve the same function as the optical lens 1.

Referring to FIG. 8, a cross-sectional view of an optical lens according to a third embodiment of the present invention is shown. Figure 8 is a cross-sectional view taken along the first axial direction X of the optical lens shown in Figure 2. The optical lens 1b shown in Fig. 8 is similar to the optical lens 1 of the first embodiment, and the same elements are denoted by the same reference numerals. It is to be noted that the difference between the two is that the inner wall 160 of the optical lens 1b shown in FIG. 8 has a predetermined angle θ 3 obliquely connected to the side wall 162 such that the side wall 162 has a first depth H1 and a second depth H2, the first depth H1 is greater than the second depth H2, the predetermined angle θ 3 is 30 degrees; the first depth H1 is the longest distance between the inner wall 160 and the bottom surface 12, and the second depth H2 is the shortest distance between the inner wall 160 and the bottom surface 12 .

When the light emitted from the optical element 1b passes through the inner wall 160, the inner wall 160 is obliquely connected to the side wall 162, and the amount of light transmitted in the direction of the second side surface 15 is reduced, so that most of the light is refracted by the inner wall 160. It enters the optical element 1b and diverge from the left side of the optical axis I by 0 to 90 degrees. Next, when the light emitted by the light-emitting element 3 enters the optical lens 1b and is transmitted to the first side surface 14, the first side surface 14 is totally reflected by the total internal reflection so that the light is directed at about 15 degrees to the left of the optical axis I. And then It is emitted from the light exit surface 10. When the light emitted from the light-emitting element 3 enters the optical lens 1b and is transmitted to the second side surface 15, it is totally reflected toward the left side of the optical axis I, and is emitted from the light-emitting surface 10. Thereby, the light is concentrated in the direction of the left side of the optical axis I by about 15 degrees, as shown by the light distribution curve L1 shown in FIG.

In addition, as can be seen from the light distribution curve L2 of FIG. 9, the light exiting angle of the light passing through the second axial direction Y of the optical lens 1b falls in the direction of about 20 degrees on each side of the optical axis I, and is approximately on both sides of the optical axis I. The light emerging between 10 degrees is roughly uniform. The function and related description of each element of the optical lens 1b are substantially the same as those of the optical lens 1 of the first embodiment, and will not be described herein. The optical lens 1b can at least achieve the same function as the optical lens 1.

The optical lenses 1, 1a and 1b of the present invention are adjusted by the curvature of the side surface and the inclination angle of the inner wall such that the light passing through the optical lenses 1, 1a and 1b converges to the left of the optical lenses 1, 1a and 1b by about 15 degrees. Direction, in other words, (optical lenses 1, 1a and 1b reduce the light that is right-biased to the optical axis, so that optical lenses 1, 1a and 1b with optics 3 are used as advertising lights or others need to be clearly cut off In the line light type, the advertising layer 5 disposed in the direction of about 15 degrees to the left of the front side of the optical lenses 1, 1a and 1b can be effectively illuminated, as shown in Fig. 10. In Fig. 10, the optical lens 1 is disposed on the advertising layer. 5 is substantially perpendicular to the plane P, and one side of the optical lens 1 having the second side surface 15 is disposed toward the advertising layer 5.

The light emitted by the light-emitting element 3 is deflected toward the second side surface 15 after passing through the optical lens 1, thereby illuminating the advertising layer 5 located on the left side of the optical lens 1.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited, that is, the equal variation and modification of the scope of the patent application of the present invention. , shall remain within the scope of the intended protection of the scope of the patent of this new type.

1‧‧‧ optical lens

10‧‧‧Glossy

12‧‧‧ bottom

14‧‧‧First side surface

15‧‧‧Second side surface

16‧‧‧ Groove

160‧‧‧ inner wall

162‧‧‧ side wall

3‧‧‧Lighting elements

I‧‧‧ optical axis

θ 1‧‧‧Predetermined angle

H1‧‧‧first depth

H2‧‧‧second depth

Claims (9)

An optical lens comprising: a first side surface; a second side surface opposite to the first side surface, the first side surface and the second side surface being configured such that the optical lens is non-positive with respect to a central axis thereof a symmetrical rotation; a light emitting surface connecting the first side surface and the second side surface; a bottom surface opposite to the light emitting surface and connecting the first side surface and the second side surface; and a groove formed in the The bottom surface extends toward the light-emitting surface, the groove is formed by an inner wall and a side wall, and the inner wall has a predetermined angle obliquely connecting the side wall, so that the side wall has a first depth and a second Depth, the first depth is greater than the second depth, the side wall having one side of the first depth corresponding to the first side surface, the side wall having one side of the second depth corresponding to the second side surface. The optical lens of claim 1, wherein the first side surface has a first curvature and the second side surface has a second curvature that is greater than the first curvature. The optical lens of claim 1, wherein the first side surface has a first curvature and the second side surface has a second curvature that is less than or equal to the first curvature. The optical lens of claim 2, wherein the depth of the groove is 30 to 70% of the thickness of the optical lens. The optical lens of claim 4, wherein the predetermined angle is between 1 and 45 degrees. The optical lens of claim 5, wherein an outer diameter of the groove is facing from the bottom The glossy surface is gradually shrinking. The optical lens of claim 6, further comprising a convex portion formed on the light-emitting surface, the convex portion protruding from the light-emitting surface in a direction opposite to the bottom surface. The optical lens of claim 7, wherein the convex portion is located within a projection range of the groove on the light exiting surface. The optical lens of claim 8, wherein the convex portion has a circular shape in a plan view of the optical lens.