Apparatus and method for manufacturing tilted microlenses
Asymmetrical structures and methods are used to adjust the orientation of a microlens for a pixel array. The asymmetrical structures affect volume and surface force parameters during microlens formation. Exemplary microlens structures include an asymmetrical microlens frame, base, material or a combination thereof to affect the focal characteristics of the microlens. The asymmetrical frame alters the microlens flow resulting from the heating of the microlens during fabrication such that orientation of the microlens relative to an axis of the imager can be controlled.
1. A lens structure for an imager, comprising:
a plurality of asymmetrical frames each for defining a boundary of a liquid lens material prior to hardening; and
a hardened lens material with sufficient volume to completely fill at least one of said asymmetrical frames and extend beyond a plane enclosing the top of said asymmetrical frames, said hardened lens material being hardened from said liquid state.
2. The lens structure of claim 1 , wherein at least one sidewall of the asymmetrical frame has a cross-sectional width different from cross-sectional widths of the other sidewalls of the asymmetrical frame.
3. The lens structure of claim 1 , wherein the asymmetrical frame has four sidewalls.
4. The lens structure of claim 3 , wherein the four sidewalls form a substantially trapezoidal cross-sectional shape.
5. The lens structure of claim 1 , wherein the asymmetrical frame has at least first, second, and third sidewalls, at least two of the sidewalls having sloped sidewalls in cross-section.
6. The lens structure of claim 1 , wherein the plurality of asymmetrical frames includes at least first and second adjacent asymmetrical frames, and wherein the first and second adjacent asymmetrical frames share a sidewall having at least two surfaces, each of said two surfaces defining a boundary for said liquid lens material.
7. The lens structure of claim 6 , wherein the first and second asymmetrical frames each have respective first and second lens materials, the first and second lens materials each having respective first and second non-zero degree angles, said non-zero degree angles measured from a horizontal axis of a plurality of pixels.
8. The lens structure of claim 7 , wherein a degree measure of the first non-zero degree angle and a degree measure of the second non-zero degree angle are equal.
9. The lens structure of claim 7 , wherein a degree measure of the first non-zero degree angle and a degree measure of the second non-zero degree angles are unequal.
10. The lens structure of claim 1 , wherein the hardened lens structure has a convex shape.
11. The lens structure of claim 1 , wherein the hardened lens structure has a concave shape.
12. A lens structure, comprising:
a plurality of frames each having an asymmetrical cavity that defines a boundary of a liquid lens material prior to hardening; and
a hardened lens material with sufficient volume to completely fill said asymmetrical cavity and extend beyond a top most surface of said asymmetrical cavity, said hardened lens material being hardened from said liquid state.
13. The lens structure of claim 12 , wherein at least one frame has at least one sidewall having a cross-sectional width different from cross-sectional widths of the other sidewalls of the frame.
14. The lens structure of claim 12 , wherein the frame has four sidewalls.
15. The lens structure of claim 12 , wherein the frame has at least first, second, and third sidewalls, at least two of the sidewalls having sloped sidewalls in cross-section.
16. The lens structure of claim 12 , wherein the plurality of frames includes at least first and second adjacent frames, and wherein the first and second adjacent asymmetrical frames share a sidewall having at least two surfaces, each of said two surfaces defining a boundary for said liquid lens material for the first and second adjacent frames, respectively.