TWI381135B - Lens and illumination apparatus having same - Google Patents

Description

Optical lens and lighting device

The present invention relates to optical systems, and more particularly to an optical lens for forming an asymmetric light field and an illumination device using the same.

With the development of semiconductor lighting technology, the light-emitting diode (LED) has been continuously improved, and it is gradually replacing the traditional light source. A novel light-emitting diode can be found in Illumination With Solid State Lighting Technology by Daniel A. Steigerwald et al., IEEE Journal on Selected Topics in Quantum Electronics, Vol. 8, No. 2, March/April 2002.

For the LED light source, how to effectively distribute the light energy emitted by the LED is a key problem to be solved in the design of the optical system in the LED light source. Most of the illumination areas formed by current LED light sources are circular. Sometimes, in order to save energy and achieve greater area illumination, such as street lamps, it is necessary to adjust the illumination area to an asymmetric light field, such as light mainly distributed along the road. Direction, and try to avoid the light distribution in the direction of vertical roads, so as to waste light. Therefore, it is necessary to provide an illumination device for forming an asymmetric light field.

An optical lens for forming an asymmetric light field and an illumination device using the same will be described below by way of embodiments.

An optical lens for adjusting light emitted by a light source, comprising a body having a first surface and a first a second surface opposite to the surface, the first surface is provided with a square groove, the side surface of the square groove is a cylindrical surface, and the bottom surface thereof is a symmetrical curved surface, and the bottom surface of the square groove serves as a light incident surface of the optical lens Light emitted from the light source is incident into the body through a bottom surface of the square groove, the second surface includes an asymmetric saddle-shaped aspheric surface, the second surface serves as a light-emitting surface of the optical lens, and a bottom surface of the square groove The second surface is used to adjust the light emitted by the light source to form an asymmetric light field.

A lighting device comprising a light source and an optical lens, the light source comprising a substrate and a light-emitting element disposed on the substrate, the optical lens being disposed relative to a light-emitting surface of the light-emitting element. The optical lens includes a body. The main body has a first surface and a second surface opposite to the first surface. The first surface is provided with a square groove. The side surface of the square groove is a cylindrical surface, and the bottom surface thereof is a symmetrical curved surface. The bottom surface of the groove serves as a light incident surface of the optical lens such that light emitted from the light emitting element enters the body through a bottom surface of the square groove, the second surface including an asymmetric saddle-shaped aspheric surface, the second surface serving as The light exiting surface of the optical lens, the bottom surface of the square recess and the second surface are used to adjust the light emitted by the optical element to form an asymmetric light field.

Compared with the prior art, the bottom surface of the square groove in the optical lens and the saddle-shaped second surface have a correcting effect on the light emitted by the light source, that is, the light emitted by the light source enters the main body of the optical lens, because the square groove The planar feature of the bottom surface directs incoming light to a predetermined location on the second surface, and due to the planar feature of the second surface, the light incident thereon can be emitted at a predetermined optical path to form an asymmetric light. field, Therefore, the illumination device having the optical lens can make the light emitted by the light source form an asymmetric light field, thereby satisfying the actual needs.

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 1 and FIG. 2, a lighting device 10 according to a first embodiment of the present invention includes a light source 11 and an optical lens 12.

The light source 11 includes a substrate 111 and a light emitting element 112 disposed on the substrate 111. Preferably, the substrate 111 is U-shaped and has an inner surface 1111. The light emitting element 112 is disposed on the inner surface 1111 of the substrate 111. For those skilled in the art, the light-emitting element 112 can be any light source, such as a halogen lamp, or a light-emitting diode or the like. Of course, the substrate 111 may also have a flat shape.

The optical lens 12 has a body having a square profile having a first surface 121 and a second surface 122 opposite the first surface 121. The first surface 121 is a flat surface opposite to the inner surface 1111 of the substrate 111 to form a receiving space for receiving the light emitting element 112. A square groove 13 is disposed on the first surface 121. The square groove 13 has a side surface 131 and a bottom surface 132. In this embodiment, the square groove 13 is located at the center of the first surface 121 of the optical lens 12, and the side surface 131 of the square groove is a cylinder perpendicular to the first surface 121. The bottom surface 132 is a symmetric surface. . The second surface 122 includes an asymmetrical saddle-shaped aspherical surface 1222. Generally, the bottom surface 132 of the square groove 13 serves as a light incident surface of the light emitted by the light emitting element 112. The optical lens 12 is configured to adjust the light emitted by the light emitting element 112 to form Asymmetric light field.

In this embodiment, a plane passing through the center of the bottom surface 132 of the square recess 13 and extending in a direction perpendicular to the saddle-shaped aspheric surface intersects the bottom surface 132 of the square recess 13 to form a first curve S ₁ , and The second surface 122 of the optical lens 12 intersects to form a second curve S ₂ , and the first curve S ₁ and the second curve S ₂ both satisfy the following operation formula (1): Z = MY + NY ² + PY ³ ( 1)

Among them, M, N, and P are not 0.

The first curve S ₁ and the second curve S ₂ both have a highest point and a lowest point. In the present embodiment, the first curve S ₁ highest and lowest points are located at ends of the first curve S _1. The highest point of the second curve S ₂ is not located the second ends of the curve S _2, nor the geometric center axis of the second curve S _2. The second curve S is located at the lowest point of the second curve ₂ S ₂ wherein one end. Moreover, the geometric central axis of the first curve S ₁ is not on the same line as the geometric central axis of the second curve S ₂ .

Of course, the second curve S ₂ highest and lowest points, respectively, may be positioned at both ends of the second curve S _2.

The bottom surface 132 of the square recess 13 and the saddle-shaped aspherical surface 1222 included in the saddle-shaped aspherical second surface 122 of the optical lens 12 all conform to the following formula (2): Z = A ₁ X ² + A ₂ X ⁴ + A ₃ X ⁶ + A ₄ X ⁸ + B ₁ Y + B ₂ Y ² + B ₃ Y ³ + B ₄ Y ⁴ + B ₅ Y ⁵ + B ₆ Y ⁶ + B ₇ Y ⁷ + B ₈ Y ⁸ + B ₉ Y ⁹ (2)

Wherein at least one of A ₁ , A ₂ , A ₃ , A ₄ is not 0, at least one of B ₁ , B ₃ , B ₅ , B ₇ , B ₉ is not 0, B ₂ , B ₄ , B ₆ , B ₈ , at least one of them is not 0.

As can be seen from the formula (2), the functional expression of the optical lens 12 is an even function of X and an odd function of Y. The bottom surface 132 of the central square groove 13 of the optical lens 12 and the saddle-shaped second surface 122 have a correcting effect on the light emitted from the light-emitting element 112 disposed in the square groove 13, that is, the light emitted by the light-emitting element 112 enters After the main body of the optical lens 12, the surface feature of the bottom surface 132 of the square recess 13 allows the incoming light to be directed to a predetermined position on the second surface 122, and due to the planar shape of the second surface 122, By directing the light incident thereon to a predetermined optical path, it can form an asymmetrical optical field that is symmetric along the Y-axis and asymmetrical along the X-axis.

Specifically, in the present embodiment, the values of the coefficients of the arithmetic expression (2) are as follows:

Further, the light emitting element 112 is disposed opposite to the bottom surface 132 of the square groove 13 . The light-emitting element 112 is placed at the origin, and its coordinates are (X, Y)=(0, 0), and the light-emitting surface of the light-emitting element 112 is on the same surface as the first surface 121 of the optical lens 12. The bottom surface 132 of the square recess 13 serves as a light incident surface of the light emitting element 112. After the light emitted by the light-emitting element 112 passes through the optical lens 12, the illuminance map and the candela diagram of the formed light field can be respectively shown in FIG. 3 and FIG. 4. As can be seen from FIG. 3 and FIG. 4, after the light emitted by the light-emitting element 112 passes through the optical lens 12, the light field formed by the illumination device 10 is an asymmetrical optical field that is symmetric along the Y-axis and asymmetric along the X-axis.

Of course, the light-emitting elements 112 can also be placed in the recesses 13 respectively, and the light-emitting surface of the light-emitting elements 112 can also be in the same plane as the first surface 121.

For the person skilled in the art, the lighting device 10 is used as a street light. In short, the first surface 121 of the optical lens 12 only needs to be parallel to the surface of the object to be illuminated, such as a road surface, to obtain an asymmetrical light field as shown in FIG.

Referring to FIG. 5 and FIG. 6, a lighting device 20 according to a second embodiment of the present invention is substantially the same as the lighting device 10 provided in the first embodiment. The illumination device 20 includes a light source 21 and an optical lens 22. The light source 21 includes a substrate 211 and a light-emitting element 212 disposed on the substrate 211. A square groove 23 is defined in the first surface 221 of the optical lens 22. The square groove 23 has a side surface 231 and a bottom surface 232. The side surface 231 of the square groove is a cylinder perpendicular to the first surface 221, and the bottom surface 232 is a symmetrical curved surface. The second surface 222 of the optical lens 22 is an asymmetrical saddle-shaped aspheric surface.

The illuminating device 20 is different from the illuminating device 10 in that the bottom surface 232 of the square groove 23 and the second surface 222 of the optical lens 23 conform to the following formula (3): Z = A ₁ X ² + A ₂ X ⁴ + A ₃ X ⁶ + A ₄ X ⁸ + B ₁ Y + B ₂ Y ² + B ₃ Y ³ + B ₄ Y ⁴ + B ₅ Y ⁵ + B ₆ Y ⁶ + B ₇ Y ⁷ + B ₈ Y ⁸ + B ₉ Y ⁹ (3)

Wherein at least one of A ₁ , A ₂ , and A ₃ A ₄ is not 0, and at least one of B ₁ , B ₃ , B ₅ , B ₇ , and B ₉ is not 0, B ₂ , B ₄ , B ₆ , B ₈ , at least one of which is not 0.

Specifically, in the present embodiment, the values of the coefficients of the arithmetic expression (3) are as follows:

Further, the light emitting element 212 is disposed opposite to the bottom surface 232 of the recess 23 . The light-emitting element 212 is placed at the origin, and its coordinates are (X, Y)=(0, 0), and the outgoing surface of the light-emitting element 212 is on the same surface as the first surface 221 of the optical lens 22. The bottom surface 232 of the recess 23 serves as a light incident surface of the optical lens. After the light emitted by the light-emitting element 212 passes through the optical lens 22, the illuminance map and the candela diagram of the formed light field can be seen in FIG. 7 and FIG. 8, respectively. As can be seen from FIG. 7 and FIG. 8, after the light emitted by the light-emitting element 212 passes through the optical lens 22, the light field formed by the illumination device 20 is an asymmetrical optical field that is symmetric along the Y-axis and asymmetric along the X-axis.

Of course, the light-emitting elements 212 can also be placed in the grooves 23, respectively, and the light-emitting surface thereof can also be in the same plane as the first surface 221 .

It can be understood that the values of the coefficients of the above equations (2) and (3) are not limited to those shown in the above embodiments, and other values may be used to obtain different values. The shape of the asymmetric light field.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art will be included in the following claims.

10, 20‧‧‧ Lighting devices

11, 21‧‧‧ Light source

111, 211‧‧‧ substrate

1111‧‧‧ inner surface

112, 212‧‧‧Lighting elements

12, 22‧‧‧ optical lens

121, 221‧‧‧ first surface

122, 222‧‧‧ second surface

1222‧‧‧Saddle aspheric

13, 23‧‧‧ square groove

131, 231‧‧‧ side

132, 232‧‧‧ bottom

1 is a schematic structural view of a lighting device according to a first embodiment of the present invention.

Figure 2 is a cross-sectional view of the lighting device of Figure 1 taken along line II-II.

3 is a illuminance simulation diagram of a light field formed by the light-emitting element of FIG. 1 through an optical lens.

4 is a candela diagram of a light field formed by the light-emitting element of FIG. 1 through an optical lens.

FIG. 5 is a schematic structural view of a lighting device according to a second embodiment of the present invention.

Figure 6 is a cross-sectional view of the lighting device of Figure 5 taken along line VI-VI.

Fig. 7 is a illuminance simulation diagram of a light field formed by the light-emitting element of Fig. 5 through an optical lens.

Figure 8 is a candela diagram of the light field formed by the light-emitting element of Figure 5 through an optical lens.

10‧‧‧Lighting device

111‧‧‧Substrate

112‧‧‧Lighting elements

121‧‧‧ first surface

122‧‧‧ second surface

1222‧‧‧Saddle aspheric

Claims (19)

An optical lens for adjusting light emitted by a light source, comprising: a body having a first surface and a second surface opposite to the first surface, the first surface being provided with a square groove, The side surface of the square groove is a cylindrical surface, and the bottom surface of the square groove is a symmetrical curved surface, and the bottom surface of the square groove serves as a light incident surface of the optical lens such that light emitted from the light source enters the bottom surface of the square groove through the bottom surface of the square groove The second surface includes an asymmetric saddle-shaped aspherical surface, the second surface serves as a light-emitting surface of the optical lens, and the bottom surface of the square groove and the second surface are used to adjust the light emitted by the light source to form An asymmetric light field, a plane passing through the center of the bottom surface of the square groove and extending in a direction perpendicular to the saddle-shaped aspheric surface intersecting the bottom surface of the groove to form a first curve, and a second surface of the optical lens The intersection forms a second curve, and the first curve and the second curve both conform to the following expression: Z = MY + NY ² + PY ³ wherein M, N, and P are not 0. The optical lens of claim 1, wherein the first curve and the second curve both have a highest point and a lowest point. The optical lens of claim 2, wherein the highest point and the lowest point of the first curve are respectively located at both ends of the first curve. The optical lens of claim 2, wherein the geometric central axis of the first curve is not in line with the geometric central axis of the second curve. The optical lens of claim 1, wherein the bottom surface of the square groove conforms to the following formula: Z = A ₁ X ² + A ₂ X ⁴ + A ₃ X ⁶ + A ₄ X ⁸ + B ₁ Y + B ₂ Y ² + B ₃ Y ³ + B ₄ Y ⁴ + B ₅ Y ⁵ + B ₆ Y ⁶ + B ₇ Y ⁷ + B ₈ Y ⁸ + B ₉ Y ⁹ wherein A ₁ , A ₂ , A ₃ , at least one of A ₄ is not 0, at least one of B ₁ , B ₃ , B ₅ , B ₇ , B ₉ is not 0, B ₂ , B ₄ , B ₆ , B ₈ , at least one of Not 0. The optical lens of claim 5, wherein the coefficients of the function of the bottom surface of the square groove are as follows: The optical lens of claim 5, wherein the coefficients of the function of the bottom surface of the square groove are as follows: The optical lens of claim 1, wherein the saddle-shaped aspheric surface conforms to the following expression: Z = A ₁ X ² + A ₂ X ⁴ + A ₃ X ⁶ + A ₄ X ⁸ + B ₁ Y + B ₂ Y ² + B ₃ Y ³ + B ₄ Y ⁴ + B ₅ Y ⁵ + B ₆ Y ⁶ + B ₇ Y ⁷ + B ₈ Y ⁸ + B ₉ Y ⁹ wherein A ₁ , A ₂ , A ₃ At least one of A ₄ is not 0, and at least one of B ₁ , B ₃ , B ₅ , B ₇ , B ₉ is not 0, B ₂ , B ₄ , B ₆ , B ₈ , at least one of which is not Is 0. The optical lens of claim 8, wherein the coefficients of the saddle-shaped aspherical function are as follows: The optical lens of claim 8, wherein the coefficients of the saddle-shaped aspherical function are as follows: An illumination device comprising a light source and an optical lens, the light source comprising a substrate and a light-emitting element disposed on the substrate, the optical lens being disposed opposite to a light-emitting surface of the light-emitting element, wherein the optical lens comprises a body The main body has a first surface and a second surface opposite to the first surface, the first surface is provided with a square groove, the side surface of the square groove is a cylindrical surface, and the bottom surface of the square groove is a symmetrical curved surface The bottom surface of the square groove serves as a light incident surface of the optical lens such that light emitted from the light emitting element enters the body through a bottom surface of the square groove, and the second surface includes an asymmetric saddle-shaped aspheric surface. The second surface serves as a light emitting surface of the optical lens, and the bottom surface of the square groove and the second surface are used to adjust the light emitted by the optical element to form an asymmetric light field, one passing through the center of the bottom surface of the square groove and A plane perpendicular to the direction in which the saddle-shaped aspherical surface extends intersects the bottom surface of the groove to form a first curve, and the optical A second mirror surface intersect to form a second curve, the first curve and the second curve are in line with the following ^{expression: Z = MY + NY 2 +} PY 3 wherein, M, N, P are not zero. The lighting device of claim 11, wherein the first curve and the second curve both have a highest point and a lowest point. The illuminating device of claim 12, wherein the highest point and the lowest point of the first curve are respectively located at two ends of the first curve. The illuminating device of claim 12, wherein the geometric central axis of the first curve is not in line with the geometric central axis of the second curve. The illuminating device of claim 11, wherein the light emitting surface of the light emitting element is on the same level as the first surface of the optical lens. The illuminating device of claim 11, wherein the bottom surface of the square groove conforms to the following formula: Z = A ₁ X ² + A ₂ X ⁴ + A ₃ X ⁶ + A ₄ X ⁸ + B ₁ Y + B ₂ Y ² + B ₃ Y ³ + B ₄ Y ⁴ + B ₅ Y ⁵ + B ₆ Y ⁶ + B ₇ Y ⁷ + B ₈ Y ⁸ + B ₉ Y ⁹ wherein A ₁ , A ₂ , A ₃ , at least one of A ₄ is not 0, at least one of B ₁ , B ₃ , B ₅ , B ₇ , B ₉ is not 0, B ₂ , B ₄ , B ₆ , B ₈ , at least one of Not 0. The illuminating device of claim 16, wherein the illuminating element is disposed at an origin, and the coordinates (X, Y) of the illuminating element are (0, 0). The illuminating device of claim 11, wherein the saddle-shaped aspheric surface conforms to the following expression: Z = A ₁ X ² + A ₂ X ⁴ + A ₃ X ⁶ + A ₄ X ⁸ + B ₁ Y + B ₂ Y ² + B ₃ Y ³ + B ₄ Y ⁴ + B ₅ Y ⁵ + B ₆ Y ⁶ + B ₇ Y ⁷ + B ₈ Y ⁸ + B ₉ Y ⁹ wherein A ₁ , A ₂ , A ₃ At least one of A ₄ is not 0, and at least one of B ₁ , B ₃ , B ₅ , B ₇ , B ₉ is not 0, B ₂ , B ₄ , B ₆ , B ₈ , at least one of which is not Is 0. The illuminating device of claim 11, wherein the substrate has a U-shaped cross section, the substrate having an inner surface, the inner surface of the substrate being opposite to the first surface of the optical lens.