Variable power optical system
Liquid lens cells are used in a variable power optical system. In one embodiment, a stop is located between a first lens group comprising at least a first liquid lens cell and a second lens group comprising at least a second liquid lens cell. In one embodiment, a liquid lens cell controls an incident angle of light rays on an image surface.
1. A variable power optical system, comprising:
a first lens group, wherein the first lens group comprises at least a first liquid lens cell;
a second lens group, wherein the second lens group comprises at least a second liquid lens cell; and
a stop located between the first lens group and the second lens group,
wherein light rays passing through the first lens group, second lens group, and the stop represent a zoom position, with control of the zoom position based at least in part on the configuration of the optical power of the first liquid lens cell and the configuration of the optical power of the second liquid lens cell,
wherein the zoom range is greater than about 3×.
2. The variable power optical system of claim 1 , wherein the stop is approximately equidistant between a first surface of the first lens group and a last surface of the second lens group.
3. The variable power optical system of claim 1 , wherein a diameter of the first liquid lens cell is about the same as a diameter of the second liquid lens cell.
4. The variable power optical system of claim 1 , wherein the zoom range is greater than about 4×.
5. The variable power optical system of claim 1 , wherein the zoom range is greater than about 5×.
6. The variable power optical system of claim 1 , wherein an optical power of the first liquid lens cell is varied to provide a focus function.
7. The variable power optical system of claim 1 , wherein the variable power optical system does not include any axially movable lens elements.
8. The variable power optical system of claim 1 , wherein a change in the optical power of the first liquid lens cell results in a variation of a chief ray angle approaching an image point on an image surface and a change in the optical power of the second liquid lens cell reduces the variation in the chief ray angle at the image point on the image surface.
9. The variable power optical system of claim 8 , wherein the second lens group is placed near the image surface and is the last optical component that substantially affects the chief ray angle.
10. The variable power optical system of claim 8 , wherein the image surface is formed in the vicinity of at least one micro-lens configured to collect and focus light onto a photosensitive area.
11. The variable power optical system of claim 8 , wherein the second lens group is configured to reduce the chief ray angle to be less than 10° from perpendicular to the image surface.
12. The variable power optical system of claim 11 , wherein the second lens group is configured to reduce the chief ray angle to be less than 5° from perpendicular to the image surface.