CN104252011A - Lens and manufacturing method thereof - Google Patents

Abstract

The invention relates to a lens. The lens includes a first lens layer and a second lens layer. The second lens layer covers the first lens layer. The refractive index of the second lens layer is greater than that of the first lens layer, so that The light entering the lens is better deflected to the side of the lens, the forward light intensity is reduced, the side light intensity is enhanced, and the light output angle is enlarged. The present invention also relates to a manufacturing method of the above-mentioned lens.

Description

Lens and method of making the same

technical field

The invention relates to the field of optics, in particular to a lens and a manufacturing method thereof.

Background technique

The effect of lamps using traditional light sources can basically meet the needs of various aspects, but the energy consumption is too large. Therefore, as a new generation of light sources, LEDs (Light Emitting Diode) have a tendency to gradually replace traditional light sources. The light source of the backlight module of the existing display is gradually replaced by light emitting diodes.

Existing display backlight modules are usually direct-lit light sources. The advantage of the direct-type light source is that it uses a smaller number of LEDs, and uses a lens to cover the LEDs, and further uses a diffuser plate, so that the light emitted by the LEDs first passes through the lens for the first optical adjustment to form a more divergent light. , and then enter the diffusion plate for further diffusion, so as to obtain a more uniform outgoing light. Therefore, how to design a lens that can better diverge the light emitted by the light-emitting diodes to both sides has been a subject that the industry has been exploring.

Contents of the invention

In view of this, it is necessary to provide a lens capable of better diverging the light emitted by the LED to both sides and a manufacturing method thereof.

A lens. The lens includes a first lens layer and a second lens layer. The second lens layer covers the first lens layer. The refractive index of the second lens layer is greater than that of the first lens layer.

A method of manufacturing the above-mentioned lens, comprising:

providing a first lens layer and a second lens layer, the second lens layer covers the first lens layer, and the refractive index of the second lens layer is greater than that of the first lens layer;

Coating an adhesive layer between the first lens layer and the second lens layer and stacking them together sequentially;

Curing the adhesive layer forms a lens.

The lens of the embodiment of the present invention uses at least two lens layers with different refractive indices. When the lens layer is higher, the light is deflected again, so that the light can be better deflected to the side of the lens, reducing the forward light intensity, enhancing the side light intensity and expanding the light output angle.

Description of drawings

FIG. 1 is a schematic perspective view of a lens provided by an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the lens in FIG. 1 along II-II.

FIG. 3 is a flow chart of the steps of the lens manufacturing method provided by the embodiment of the present invention.

Description of main component symbols

lens 10 first lens layer 11 second lens layer 12 The inner surface 121, 131 The outer surface 122, 132 third lens layer 13 Adhesive layer 14

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

Detailed ways

Please refer to FIG. 1 and FIG. 2 , the lens 10 provided by the embodiment of the present invention includes at least two lens layers, and the refractive indices of the at least two lens layers are different. In this embodiment, the lens 10 includes a first lens layer 11, a second lens layer 12 and a third lens layer 13, wherein the first lens layer 11 is located at the innermost layer of the lens 10, and the third lens layer 13 is located at the innermost layer of the lens 10. The outermost layer, the second lens layer 12 is located between the first lens layer 11 and the third lens layer 13 , that is, the third lens layer 13 covers the second lens layer 12 , and the second lens layer 12 covers the first lens layer 11 .

The lens 10 has a semicircular shape as a whole, and the first lens layer 11 also has a semicircular shape, and the center of the first lens layer 11 coincides with the center of the lens 10 . The first lens layer 11 has a first radius R1. The second lens layer 12 has an inner surface 121 attached to the first lens layer 11 and an outer surface 122 attached to the third lens layer 13 . The inner surface 121 and the outer surface 122 of the second lens layer 12 are both hemispherical surfaces, wherein the radius of the inner surface 121 is approximately equal to the first radius of the first lens layer 11, which is R1; the radius of the outer surface is R2. The third lens layer 13 has an inner surface 131 attached to the outer surface 122 of the second lens layer 12 and an outer surface 132 located on the outermost layer of the lens 10 , and the outer surface 132 is the outer surface of the lens 10 . The inner surface 131 and the outer surface 132 of the third lens layer 13 are also hemispherical surfaces, wherein the radius of the inner surface 131 is equal to the radius of the outer surface of the second lens layer 12, which is R2, and the radius of the outer surface 132 is R3, namely is the overall radius value of the lens 10 . The ratio of the radius of the first lens layer 11 , the outer diameter of the second lens layer 12 and the outer diameter of the third lens layer 13 is preferably 1:2:4.

The first lens layer 11, the second lens layer 12 and the third lens layer 13 are made of different materials respectively, wherein the refractive index of the material of the first lens layer 11 is smaller than the refractive index of the material of the second lens layer 12, and the second The refractive index of the material of the lens layer 12 is smaller than the refractive index of the material of the third lens layer 13 . In this embodiment, each lens layer is a material containing different numbers of benzene rings formed by polymerization of monomer materials containing benzene rings. Since the number of benzene rings contained in each lens layer is different, the refractive index of the material is different, as shown in Methyl methacrylate (MMA) is a plexiglass monomer that is polymerized to produce plastic materials with different refractive indices.

An adhesive layer 14 is also included between each lens layer, and the adhesive layer 14 is coated between two adjacent lens layers by means of spin coating with an adhesive. In this embodiment, the first lens layer The thickness of the adhesive layer 14 between 11 and the second lens layer 12 and between the second lens layer 12 and the third lens layer 13 is 10 nanometers (nm). After coating, the adhesive layer 14 is cured by irradiating ultraviolet light so as to connect the various lens layers.

The light source is arranged below the lens 10. When the light emitted by the light source enters the lens 10, it first enters the first lens layer 11. When entering the second lens layer 12 from the first lens layer 11, due to the refraction of the first lens layer 11 The refractive index is smaller than the second lens layer 12, so the light is deflected toward the side of the lens 10; when the light enters the third lens layer 13 from the second lens layer 12, because the second lens layer 12 has a lower refractive index than the third lens The refractive index of the layer 13, so the light is further deflected toward the side of the lens 10, reducing the forward light intensity, enhancing the side light intensity and expanding the light exit angle.

Please refer to Fig. 3 at the same time, the present invention also provides a kind of manufacturing method of this lens 10, comprises the following steps:

Step 1: providing a first lens layer 11 and a second lens layer 12, the second lens layer 12 covers the first lens layer 11, and the refractive index of the second lens layer 12 is greater than that of the first lens layer 11;

Step 2: Coating an adhesive layer 14 between the first lens layer 11 and the second lens layer 12 and stacking them together in sequence;

Step 3: curing the adhesive layer 14 to form the lens 10 .

In the first step, a third lens layer 13 may also be included, the centers of the three lens layers coincide, wherein the second lens layer 12 has a depression identical in shape to the first lens layer 11, and the third lens layer 13 is provided with There is a depression having the same shape as the second lens layer 12 . Each lens layer can be formed by thermocompression molding using different molds, wherein the first lens layer 11 , the second lens layer 12 and the third lens layer 13 are thermocompression molding using different materials.

In the second step, the material of the bonding layer 14 is an adhesive, and the thickness of the coating is 10 nanometers. The adhesive is coated between each lens layer by coating, and in the third step Curing and molding are carried out by ultraviolet light irradiation.

It can be understood that, for those skilled in the art, various other corresponding changes and deformations can be made according to the technical concept of the present invention, and all these changes and deformations should belong to the protection scope of the claims of the present invention .

Claims (10)

1. A lens, characterized in that: the lens comprises a first lens layer and a second lens layer, the second lens layer covers the first lens layer, and the refractive index of the second lens layer is greater than that of the first lens layer . 2. The lens according to claim 1, wherein the lens further comprises a third lens layer, and the third lens layer covers the second lens layer. 3. The lens according to claim 2, characterized in that: the first lens layer is hemispherical, and the second lens layer includes an inner surface bonded to the first lens layer and an inner surface bonded to the third lens layer. The outer surface is a hemispherical surface. 4. The lens according to claim 3, wherein the third lens layer comprises an inner surface bonded to the outer surface of the second lens layer and an outer surface positioned outside the lens, the third lens layer The outer surface is a hemisphere. 5. The lens according to claim 4, wherein the radius of the first lens layer is 1/2 of the outer diameter of the second lens layer, and is 1/4 of the outer diameter of the third lens layer. 6 . The lens according to claim 1 , wherein the first and second lens layers are materials containing different numbers of benzene rings formed by polymerization of monomer materials containing benzene rings. 7. The lens according to claim 1, wherein an adhesive layer is further included between the first and second lens layers, and the thickness of the adhesive layer is 10 nanometers. 8. A method of making the lens according to any one of claims 1-7, comprising: providing a first lens layer and a second lens layer, the second lens layer covers the first lens layer, and the refractive index of the second lens layer is greater than that of the first lens layer; Coating an adhesive layer between the first lens layer and the second lens layer and stacking them together sequentially; Curing the adhesive layer forms a lens. 9. The method for manufacturing a lens according to claim 8, wherein the first and second lens layers are made of different materials by thermocompression molding. 10. The method of making a lens according to claim 8, wherein the adhesive layer is coated between the first and second lens layers with an adhesive, and ultraviolet light is used in the third step Cured by irradiation.