CN106531872A - Aspherical optical lens and luminous device comprising same - Google Patents

Abstract

An aspheric optical lens, the aspheric optical lens is rotationally symmetrical about a central axis, the aspheric optical lens includes: a light source side optical surface; and an imaging side optical surface, the imaging side optical surface includes a first area, The first area is a plane, and the first area is rotationally symmetrical about the central axis. The invention also relates to a light-emitting device containing the aspherical optical lens.

Description

Aspheric optical lens and light-emitting device composed of it

technical field

The invention relates to the field of optics, in particular to an aspheric optical lens and a light-emitting device formed thereof.

Background technique

In the prior art, light emitting diodes (light emitting diodes, LEDs) are generally equipped with optical lenses to achieve uniform illumination and light pattern optimization. When designing, light-emitting diodes are generally regarded as point light sources. However, in fact, LED is a surface light source or a volume light source rather than a point light source. Therefore, in the prior art, the optical lens designed based on the LED as a point light source has problems in light uniformity and light pattern optimization. .

Contents of the invention

In view of this, the present invention provides an aspheric optical lens capable of solving the above problems and a light emitting device formed thereof.

An aspheric optical lens, the aspheric optical lens is rotationally symmetrical about a central axis, and the aspheric optical lens includes:

a light source side optical surface; and

An imaging-side optical surface, the imaging-side optical surface includes a first area, the first area is a plane, and the first area is rotationally symmetrical about the central axis.

A light-emitting device, the light-emitting element is rotationally symmetrical about a central axis, and the light-emitting device includes:

an aspheric optical lens as described above; and

A light emitting element, the light emitting element is opposite to the light source side optical surface.

In the aspheric optical lens and the light-emitting device it constitutes provided by the present invention, the first region of the optical surface on the imaging side is designed to be a plane, so that the light is emitted more uniformly on the optical surface on the imaging side, and the aspheric optical lens is further optimized. And the light type of the light-emitting device it constitutes.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a light emitting device provided by the present invention.

Fig. 2 is a top view of the light emitting device shown in Fig. 1 .

Fig. 3 is a schematic diagram of light emitting light when the light emitting point of the light emitting element is located directly below the symmetry axis of the light emitting device provided by the present invention.

Fig. 4 is a schematic diagram of light emitting light when the light emitting point of the light emitting element deviates from directly below the symmetry axis of the light emitting device provided by the present invention.

Fig. 5 is an angular distribution diagram of the light emitting device provided by the present invention.

Explanation of main component symbols

light emitting device 100 Aspheric optical lens 10 Light source side optical surface 11 Imaging side optical surface 12 first area 121 second area 122 third area 123 Outer side 13 bottom surface 14 Sealant layer 20 first surface twenty one second surface twenty two Light emitting element 30 light emitting surface 31 the light 32

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

The aspheric optical lens provided by the present invention and the light-emitting element formed thereof will be further described below with reference to FIGS. 1 to 4 and embodiments.

A light emitting device 100 is rotationally symmetrical about a central axis Z. The light emitting device 100 includes an aspheric optical lens 10 , a sealant layer 20 and a light emitting element 30 . The sealant layer 20 is located on the surface of the light emitting element 30 .

The aspheric optical lens 10 includes a light source side optical surface 11 and an imaging side optical surface 12 . The light source side optical surface 11 is opposite to the light emitting element 30 . The imaging side optical surface 12 is opposite to the light source side optical surface 11 and away from the light emitting element 30 .

The imaging side optical surface 12 includes a first area 121, a second area 122 and a third area 123, the first area 121 is a plane and is rotationally symmetric about the central axis Z, the second area 122 is a tangent line A curved surface with a slope greater than 0, the third area 123 is a curved surface with a tangent line whose slope is less than 0, the second area 122 connects the first area 121 and the third area 123, and the third area 123 connects the second area 122 and The outer side 13 .

Wherein, the radius of the first region 121 is less than 1 mm. In this embodiment, the first region 121 is a circular plane, and in other embodiments, the first region 121 can also be a plane of other shapes.

The aspheric optical lens 10 further includes an outer surface 13 and a bottom surface 14 , the outer surface 13 connects the third region 123 and the bottom surface 14 , and the bottom surface 14 connects the outer surface 13 and the light source side optical surface 11 .

The sealant layer 20 includes a first surface 21 and a second surface 22 opposite to the first surface 21 .

The sealant layer 20 is transparent and has high refractive index and light transmittance to reduce the loss of photons at the interface, improve the light extraction efficiency of the light-emitting element 30 and provide mechanical protection for the light-emitting element 30 . At the same time, the sealant layer 20 can also be used as a light guiding structure to guide the light emitted by the light emitting element 30 into the aspheric optical lens 10 .

The light-emitting element 30 includes a light-emitting surface 31 , and the sealant layer 20 is coated on the light-emitting surface 31 . The light emitting element 30 is opposite to the light source side optical surface 11 .

The first surface 21 of the sealant layer 20 is in contact with the bottom surface 14 , and the second surface 22 of the sealant layer 20 is in contact with the light emitting surface 31 . In this embodiment, the light emitting element 30 is a light emitting diode (LED), and the light emitting device 100 is a light emitting diode element. In other embodiments, the light emitting element 30 may also be a laser diode (LD), and the light emitting device 100 is a laser diode element.

Referring to Fig. 3, Fig. 4, Table 1 and Table 2, the angle between the light 32 emitted from the light-emitting surface 31 and the central axis Z of the light emitting device 100 is defined as _θi , and the light emitted from the aspheric optical lens 10 The angle between 32 and the central axis Z of the light emitting device 100 is _θf , _θ1 is the angle between the incident light and the normal of the optical surface ₁₁ on the light source side, and θ2 is the normal between the incident light and the optical surface 12 on the imaging side. The included angle of the line, where, θ ₁ depends on the shape of the optical surface 11 on the light source side, and θ ₂ depends on the shape of the optical surface 12 on the imaging side.

Please refer to FIG. 3 and Table 1. When the light-emitting point of the light-emitting element 30 is on the central axis Z of the light-emitting device 100, in the first region 121, the light 32 is between the central axis Z of the light-emitting device 100 and the second When the intersection point of a region 121 (the intersection point is defined as a singular point), it will directly pass through the singular point, θ _i =θ _f ; when the light ray 32 is incident in the first region 121 other than the singular point, Refraction will occur, θ _i < θ _f . In the second region 122 , the light 32 will be refracted, θ _i <θ _f . In the third region 123 , the light 32 will be refracted, θ _i <θ _f .

Referring to FIG. 4 and Table 2, when the light-emitting point of the light-emitting element 30 deviates from the central axis Z of the light-emitting device 100 , the light 32 will be refracted in the first region 121 , θ _i >θ _f . In the second region 122 , the light 32 will be totally reflected, θ _i >θ _f . In the third region 123 , the light 32 will be refracted, θ _i <θ _f .

Table 1

Table 2

Wherein, Table 1 is when the luminous point of the light-emitting element 30 is on the central axis Z of the light-emitting device 100, the angle θi between the light 32 emitted from the light-emitting surface 31 and the central axis Z of the light-emitting device 100 and the angle _θi from the light-emitting device 100 The relationship between the light ray 32 emitted from the imaging-side optical surface 12 and the angle θ _f between the central axis Z of the light emitting device 100; Between the angle θ _i between the light 32 emitted from the light emitting surface 31 and the central axis Z of the light emitting device 100 and the angle θ _f between the light 32 emitted from the imaging side optical surface 12 and the central axis Z of the light emitting device 100 Relationship.

Please refer to FIG. 5 , according to the above structure, the aspheric optical lens and the light-emitting device formed by the present invention have a circular light pattern with a narrow illumination angle greater than 70° and less than 80°.

In the aspheric optical lens provided by the present invention and the light-emitting device it constitutes, the first area of the imaging side optical surface is designed as a plane, and the second area is designed as a total reflection area, 1) so that the light emitted from the light-emitting surface 32 The relationship between the included angle θ _i with the central axis Z of the light emitting device and the included angle θ _f between the light 32 emitted from the imaging-side optical surface and the central axis Z of the light emitting device 100 not only includes θ _i <θ _f , Also contains θ _i = θ _f and θ _i > θ _f , light 32 exits more evenly on the imaging side optical surface; 2) The aspheric optical lens provided by the present invention and the light-emitting device it constitutes can comply with The circular light pattern with a narrow illumination angle of 80° further optimizes the light pattern of the aspheric optical lens and the light-emitting device it constitutes compared with the prior art.

It can be understood that the above embodiments are only used to illustrate the present invention, not to limit the present invention. For those skilled in the art, other corresponding changes and deformations made according to the technical concept of the present invention all fall within the protection scope of the claims of the present invention.

Claims (9)

1. A kind of aspherical optical lens, this aspheric optical lens is rotationally symmetrical about a central axis, and this aspheric optical lens comprises: a light source side optical surface; and An imaging-side optical surface, the imaging-side optical surface includes a first area, the first area is a plane, and the first area is rotationally symmetrical about the central axis. 2. The aspherical optical lens as claimed in claim 1, wherein, in the first region, when the light-emitting point of the light-emitting element is right on the central axis, θ _i =θ _f &θ _i <θ _f ; when When the light-emitting point of the light-emitting element deviates from the central axis, θ _i >θ _f , wherein, θ _i is the angle between the light emitted from the light-emitting element and the central axis, and θ _f is the light emitted from the imaging-side optical surface Angle with the central axis. 3. The aspherical optical lens according to claim 2, wherein the imaging-side optical surface further includes a second region, the second region is a curved surface with a tangent line slope greater than 0, when the light-emitting point of the light-emitting element When facing the central axis, the second area is a non-total reflection surface; when the light-emitting point of the light-emitting element deviates from the central axis, the second area is a total reflection surface; when the second area is a non-total reflection surface, θ _i <θ _f ; when the second region is a total reflection surface, θ _i >θ _f . 4. The aspherical optical lens according to claim 2, wherein the imaging-side optical surface further comprises a third area, the third area is a curved surface with a tangent line slope less than 0, and the second area connects the first A region and the third region, in the third region, θ _i <θ _f . 5. The aspheric optical lens according to claim 2, wherein the aspheric optical lens further comprises an outer surface and a bottom surface, the bottom surface is opposite to the imaging side optical surface, and the outer surface is connected to the third area and the bottom surface, the bottom surface is connected with the outer surface and the light source side optical surface. 6. The aspheric optical lens according to claim 1, characterized in that, the aspheric optical lens has a circular light pattern with a narrow illumination angle greater than 70° and less than 80°. 7. The aspheric optical lens as claimed in claim 1, wherein the radius of the first region is less than 1 mm. 8. A light emitting device, the light emitting device is rotationally symmetrical about a central axis, the light emitting element comprising: An aspheric optical lens as claimed in any one of claims 1 to 7; and A light emitting element, the light emitting element is opposite to the light source side optical surface. 9. The light emitting device according to claim 8, characterized in that, the light emitting device further comprises a sealant layer, the sealant layer is transparent and has a relatively high refractive index and light transmittance, and the sealant layer is coated on The light emitting surface of the light emitting element.