TWI402162B - Composite micro-lens and composite micro-lens array - Google Patents

Description

Composite microlens and composite microlens array

The invention relates to the field of optics, in particular to a composite microlens and a composite microlens array fabricated by wafer level replication technology.

Optical components currently used in mobile phone lens modules, such as lenses, are mostly produced by injection molding. However, the thickness of the lens produced by the injection molding method is 0.3 mm (mm) or more, and the black Soma light shielding film in the lens module is also stored in a certain thickness. At present, mobile phone designs are all demanding in terms of lightness and thinness. They require that the thickness of each optical component in the lens module of the mobile phone be reduced, and the overall thickness and size requirements are more and more demanding. However, previous injection molding techniques have reached their limits.

With the continuous development of optical replication technology, it has become possible to fabricate optical components of smaller size. For example, the fabrication of nano-optical components such as 1/4 wave plates and polarizers can be found in "Redefine Optical Device's Integration and Manufacturing" by Jian Jim Wang at the 14th Annual Wireless and Optical Communications Conference (April 22-23, 2005). Through Nano-Engineering" article.

A composite microlens and a composite microlens array, which can meet the requirements for lightness and thinness of optical components, will be described below by way of examples.

A composite microlens comprising: a rigid light transmissive layer having a first surface and a second surface opposite the first surface; a first plastic lens embossed on the first surface; The second plastic lens is formed on the second surface, and the second plastic lens is different from the material of the first plastic lens.

Further, the rigid light transmissive layer may be made of glass or quartz.

Further, the imprinting method may employ ultraviolet embossing.

Further, the composite microlens may include a filter layer disposed between the first surface and the first plastic lens or between the second surface and the second plastic lens.

Further, the composite microlens may further include an anti-reflection layer formed on the first surface or the second surface, and the filter layer is disposed on both sides of the rigid transparent layer .

Further, the first plastic lens and the second plastic lens may be a plano-convex lens or a plano-concave lens, respectively.

Further, the composite microlens may include a filter layer thermoformed on one side of the first plastic lens away from the first surface or one of the second plastic lens away from the second surface side.

Further, the composite microlens may include an aperture layer formed on the aperture layer On the first surface, on the second surface, the first plastic lens is away from the side of the first surface or the second plastic lens is away from the side of the second surface.

Further, the aperture layer may be a metal layer such as a chromium (Cr) layer or an aluminum (Al) layer.

And a composite microlens array comprising: a rigid light transmissive layer having a first surface and a second surface opposite the first surface; a first plastic lens array, embossed on the first surface The first plastic lens array includes a plurality of first plastic lenses, and a second plastic lens array is formed on the second surface, the second plastic lens array includes a plurality of second plastic lenses; The second plastic lenses are respectively coaxial with the first plastic lens corresponding thereto, and the second plastic lens array is different from the material of the first plastic lens array. The composite microlens array can be cut into a plurality of the aforementioned composite microlenses.

Compared with the prior art, the first plastic lens and the second plastic lens are formed on the rigid transparent layer by imprinting, and the materials of the first and second plastic lenses are different; the structure and characteristic configuration make the composite micro The lens is suitable for fabrication using wafer level replication technology and is suitable for mass production, thereby meeting the current demand for thin and light optical components.

10‧‧‧Composite microlens array

11, 110‧‧‧ rigid light transmission layer

13‧‧‧First plastic lens array

15‧‧‧Second plastic lens array

12, 120‧‧‧ filter layer

14, 140‧‧‧ anti-reflection layer

16, 160‧‧ ‧ aperture layer

100‧‧‧Composite microlens

102,112‧‧‧ first surface

104, 114‧‧‧ second surface

130‧‧‧First plastic lens

150‧‧‧Second plastic lens

Optical axis ‧‧OO’

Cutting line ‧‧M

1 is a cross-sectional view showing the structure of a composite microlens according to an embodiment of the present invention.

2 is a cross-sectional view showing the structure of another composite microlens according to an embodiment of the present invention.

3 is a cross-sectional view showing the structure of another composite microlens according to an embodiment of the present invention. .

4 is a cross-sectional view showing the structure of another concavo-convex composite microlens according to an embodiment of the present invention.

5 is a cross-sectional view showing the structure of the composite microlens of FIG. 1 further including a filter layer and an anti-reflection layer.

6 is a cross-sectional view showing a structure in which the filter layer in the composite microlens shown in FIG. 5 is disposed on one side of the first plastic lens away from the first surface.

7 is a cross-sectional view showing the structure of the composite microlens shown in FIG. 5 further including an aperture layer.

FIG. 8 is a cross-sectional view showing the structure of a first plastic lens array formed by embossing one side of a rigid light transmitting layer according to an embodiment of the present invention.

Figure 9 is a cross-sectional view showing the structure of a composite microlens array after embossing a second plastic lens array on the opposite side of the rigid light-transmissive layer shown in Figure 8.

10 is a cross-sectional view showing the structure of the composite microlens array of FIG. 9 further including a filter layer and an anti-reflection layer.

Figure 11 is a cross-sectional view showing the structure of the composite microlens array of Figure 10 further including an aperture layer.

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

Referring to FIG. 1 , a composite microlens 100 according to an embodiment of the present invention includes: a rigid transparent layer 110 , a first plastic lens 130 , and a second plastic lens . 150.

The rigid light transmissive layer 110 has a first surface 112 and a second surface 114 opposite to the first surface 112. The material of the rigid light transmissive layer 110 may be a visible light permeable material such as glass or quartz. The rigid light transmissive layer 110 is a flat plate structure. The first plastic lens 130 is embossed on the first surface 112 of the rigid light transmissive layer 110, which is a plano-convex lens and whose lens surface away from the first surface 112 is convex. The second plastic lens 150 is embossed on the second surface 114 of the rigid light transmissive layer 110, which is a plano-convex lens and whose lens surface away from the second surface 114 is convex. The embossing method can adopt an ultraviolet embossing (Ultraviolet Embossing) or the like. The first plastic lens 130 and the second plastic lens 150 may be made of a material having a refractive index of 1.4 to 1.6; the first plastic lens 130 and the second plastic lens 150 are different in material.

The first and second plastic lenses 130, 150 are not limited to the plano-convex lens, so that the composite microlens 100 is a lenticular lens, which may also be configured in other shapes as shown in FIGS. 2 to 4. Specifically, as shown in FIG. 2, the first plastic lens 130 and the second plastic lens 150 are both a plano-concave lens, so that the composite microlens is a double concave lens. As shown in FIG. 3, the first plastic lens 130 is a plano-convex lens, and the second plastic lens 150 is a plano-concave lens, so that the composite microlens is a meniscus lens. As shown in FIG. 4, the first plastic lens 130 is a plano-concave lens, and the second plastic lens 150 is a plano-convex lens, so that the composite microlens is a meniscus lens.

Referring to FIG. 5, the composite microlens 100 shown in FIG. 1 may further include a filter layer 120 and an anti-Reflective layer 140. The filter layer 120 is disposed, for example Sputter is formed on the first surface 112 of the rigid transparent layer 110 and between the first surface 112 and the first plastic lens 130, which may be an infrared cut filter layer or infrared conductive (Infrared) Pass) Filter layer or other filter structure that is set according to actual needs. The anti-reflective layer 140 is disposed, for example, on the second surface 114 of the rigid transparent layer 110 and between the second surface 114 and the second plastic lens 150. The filter layer 120 is disposed on the rigid transparent layer. On both sides of the 110.

It can be understood that the filter layer 120 and the anti-reflection layer 140 can also be interchanged. Further, the filter layer 120 may also be disposed, for example, hot-embossed on the lens surface of the first plastic lens 130 away from the first surface 112 (as shown in FIG. 6) or the second plastic lens. The anti-reflection layer 140 may be disposed on the surface of the lens of the first plastic lens 130 away from the first surface 112 or the second plastic. The lens 150 is on the surface of the lens that is away from one side of the second surface 114.

Referring to FIG. 7, the composite microlens 100 shown in FIG. 5 may further include an aperture layer 160. The aperture layer 160 can be disposed, for example, by sputtering between the first surface 112 and the first plastic lens 130, between the second surface 114 and the second plastic lens 150, and away from the first surface 112 of the first plastic lens 130. The surface of the lens on the side or the surface of the lens of the second plastic lens 150 away from the side of the second surface 114. In this embodiment, the aperture layer 160 is disposed between the first surface 112 and the first plastic lens 130. More specifically, the aperture layer 160 is disposed between the filter layer 120 and the first plastic lens 130, and has a light passing through. Hole (not shown). Light The thickness of the layer 160 can be set to 1 to 2 micrometers (μm). The aperture layer 160 can be a chromium (Cr) layer, an aluminum (Al) layer, or other suitable metal layer to block stray light.

It should be noted that the composite microlens 100 in this embodiment can selectively provide one or more of the filter layer 120, the anti-reflection layer 140, and the aperture layer 160 according to actual needs.

Referring to FIG. 8 and FIG. 9, a method for fabricating the composite microlens 100 of FIG. 1 will be briefly described. The manufacturing method may include the following steps. First, a rigid light transmissive layer 11 having a first surface 102 and A second surface 104 opposite to the first surface 102; a first plastic lens array 13 (shown in FIG. 8) is formed on the rigid light transmissive layer 11 by ultraviolet embossing (Ultraviolet Embossing). Specifically, the rigid transparent layer 11 is a flat plate structure, and a UV curable polymer is provided on the first surface 102 of the rigid transparent layer 11 to form a stamper, such as a stamping surface. a patterned PDMS (Polydimethylsiioxane) stamper is pressed onto the ultraviolet curable polymer, and the ultraviolet curable polymer is irradiated from the other side of the stamper relative to the embossed surface thereof by ultraviolet light, thereby being rigid. The light transmissive layer 11 forms a first plastic lens array 13. The first plastic lens array 13 includes a plurality of first plastic lenses 130.

Then, a second plastic lens array 15 is formed on the second surface 104 of the rigid transparent layer 11 by ultraviolet embossing, so that a composite microlens array 10 (shown in FIG. 9) can be obtained; the second plastic lens The material of the array 15 is different from the material of the first plastic lens array 13. The second plastic lens array 15 includes a plurality of second The plastic lens 150, and the plurality of second plastic lenses 150 respectively have a common optical axis OO' with the first plastic lens 130 corresponding thereto.

Then, the composite microlens array 10 is diced along the dicing line M shown in FIG. 9, so that a plurality of composite microlenses 100 as shown in FIG. 1 can be obtained.

Referring to FIG. 10, in order to obtain a plurality of composite microlenses 100 as shown in FIG. 5, before forming the first plastic lens array 13 and the second plastic lens array 15, the first surface 102 on the rigid transparent layer 11 and The second surface 104 is formed, for example, by sputtering a filter layer 12 and an anti-reflection layer 14. It can be understood that the filter layer 12 can be formed on the side of the first plastic lens array 13 away from the first surface 102 or the second plastic lens array after the first plastic lens array 13 and the second plastic lens array 15 are formed. 15 is away from one side of the second surface 104. Similarly, the anti-reflection layer 14 may be formed on one side of the first plastic lens array 13 away from the first surface 102 or on the side of the second plastic lens array 15 away from the second surface 104.

Referring to FIG. 11, in order to obtain a plurality of composite microlenses as shown in FIG. 7, an aperture layer 16 may be formed by sputtering after the formation of the filter layer 12 and before the formation of the first plastic lens array 13. It can be understood that the aperture layer 16 can be formed by hot pressing on the side of the first plastic lens array 13 away from the first surface 102 after the first plastic lens array 13 and the second plastic lens array 15 are formed. Or the side of the second plastic lens array 15 away from the second surface 104.

It should be noted that the composite microlens array 10 in this embodiment can selectively provide one of the filter layer 12, the anti-reflection layer 14 and the aperture layer 16 according to actual needs. One or more.

In addition, the first plastic lens 130, the second plastic lens 150, the first plastic lens array 13, and the second plastic lens array 15 in the embodiment of the present invention are not limited to ultraviolet embossing, and other embossing methods may be adopted. , for example, hot stamping methods. When the hot stamping method is used, preferably, the first plastic lens 130 and the second plastic lens 150 have different glass transition temperatures, and the first plastic lens array 13 and the second plastic lens array 15 are glass. The glass transition temperature is different.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧Composite microlens

112‧‧‧ first surface

114‧‧‧ second surface

110‧‧‧Rigid light transmission layer

130‧‧‧First plastic lens

150‧‧‧Second plastic lens

Claims (14)

A composite microlens comprising: a rigid light transmissive layer having a first surface and a second surface opposite the first surface; a first plastic lens embossed on the first surface; a second plastic lens, the embossing is formed on the second surface, the second plastic lens is different from the material of the first plastic lens; and an aperture layer formed on the first surface and the first plastic lens Between the second surface and the second plastic lens, the first plastic lens is away from the side of the first surface or the second plastic lens is away from the side of the second surface. The composite microlens of claim 1, wherein the rigid light transmissive layer is made of glass or quartz. The composite microlens of claim 1, wherein the first and second plastic lenses are respectively formed by ultraviolet embossing on the first surface and the second surface. The composite microlens of claim 1, wherein the composite microlens further comprises a filter layer disposed between the first surface and the first plastic lens or the second surface Between the second plastic lenses. The composite microlens of claim 1, wherein the composite microlens further comprises an anti-reflection layer formed on the first surface or the second surface and separated from the filter layer Provided on both sides of the rigid light transmitting layer. The composite microlens of claim 1, wherein the composite microlens further comprises a filter layer, wherein the filter layer is thermoformed on a side of the first plastic lens away from the first surface or The second plastic lens is away from one side of the second surface. The composite microlens of claim 4, wherein the filter layer is an infrared cut-off filter layer or an infrared pass filter layer. The composite microlens of claim 1, wherein the first plastic lens and the second plastic lens are plano-convex lenses or plano-concave lenses. The composite microlens of claim 8, wherein the aperture layer is a chromium layer or an aluminum layer. A composite microlens array comprising: a rigid light transmissive layer having a first surface and a second surface opposite the first surface; a first plastic lens array, embossed on the first surface, The first plastic lens array includes a plurality of first plastic lenses; a second plastic lens array is formed on the second surface, the second plastic lens array includes a plurality of second plastic lenses; the plurality of second lenses The plastic lens is respectively coaxial with the first plastic lens corresponding thereto, the second plastic lens array is different from the material of the first plastic lens array; and an aperture layer is formed on the first surface, the first On one of the two surfaces, the first plastic lens array is away from the side of the first surface or the second plastic lens array is away from the side of the second surface. The composite microlens array of claim 10, wherein the composite microlens array further comprises a filter layer disposed on the first surface and Between the first plastic lens arrays or between the second surface and the second plastic lens array. The composite microlens array of claim 10, wherein the composite microlens array further comprises an anti-reflection layer formed on the first surface or the second surface and coupled to the filter The layers are disposed on both sides of the rigid light transmissive layer. The composite microlens array of claim 10, wherein the composite microlens array further comprises a filter layer thermoformed on the first plastic lens array away from the first surface The side or the second plastic lens array is away from one side of the second surface. The composite microlens array of claim 10, wherein the first plastic lens and the second plastic lens are plano-convex lenses or plano-concave lenses.