Lens Systems And Method

• US 20100231783A1
• Filed: 03/09/2010
• Published: 09/16/2010
• Est. Priority Date: 03/13/2009
• Status: Active Grant

• Current Assignee: Nextlens Switzerland AG (Optotune Switzerland AG)
• Original Assignee: Optotune AG (Optotune Switzerland AG)
• Inventors: Aschwanden, Manuel, Niederer, David, Gratzel, Chauncey, Büeler, Michael
• Granted Patent: US 8,659,835 B2
• Time in Patent Office: Days
• US Class Current: 348/347
• CPC Class Codes: G02B 27/0025 for optical correction, e.g. distorsion, aberration
• CPC Class Codes: G02B 27/005 for correction of secondary colour or higher-order chromatic aberrations
• CPC Class Codes: G02B 3/0081 having one or more elements with analytic function to create variable power variable magnification in general G02B15/00
• CPC Class Codes: G02B 3/14 of variable focal length
• CPC Class Codes: G02B 7/04 with mechanism for focusing or varying magnification

Abstract

An optical system includes a first deformable lens having a membrane with a deformable portion. A sensor is configured to receive the light focused by the first deformable lens. An optical path extends through the first deformable lens and to the sensor. The first deformable lens is tuned according to an applied electrical signal in order to directly focus light traversing the optical path onto the sensor. A first volume of a first optical media and a second volume of a second optical media are defined at least in part by the deformable portion of the membrane. The first volume and the second volume are completely enclosed by the housing. The first volume and the second volume remain substantially constant for all configurations of the first deformable lens.

Claims

1. An optical system comprising:

a first deformable lens including a membrane with a deformable portion;

a sensor configured to receive the light focused by the first deformable lens;

an optical path extending through the first deformable lens and to the sensor;

wherein the first deformable lens is tuned according to an applied electrical signal in order to directly focus light traversing the optical path onto the sensor;

wherein a first volume of a first optical media and a second volume of a second optical media are defined at least in part by the deformable portion of the membrane, the first volume and the second volume being completely enclosed by a housing;

wherein the first volume and the second volume remain substantially constant for all configurations of the first deformable lens.

2. The system of claim 1 wherein the first deformable lens is deformed at least in part by an element selected from the group consisting of an electrostatic actuator, an electromagnetic actuator, magneto-strictive actuator a piezo motor, a stepper motor, and an electroactive polymer actuator.

3. The system of claim 1 further comprising a second deformable lens that is disposed within the optical path, the second deformable lens operates with the first deformable lens to focus light traversing the optical path onto the sensor.

4. The system of claim 3 wherein the first and second deformable lenses are tuned according to the applied electrical signal in order to directly focus light traversing the optical path onto the sensor according to a varifocal operation.

5. The system of claim 3 wherein the first deformable lens and the second deformable lens are tuned at least in part by an element selected from the group consisting of an electrostatic actuator, an electromagnetic actuator, magnetostrictive actuator, a piezo motor, a stepper motor, and an electroactive polymer actuator.

6. The system of claim 1 wherein the first deformable lens is configured to change from a concave shape to a convex shape.

7. The system of claim 3 wherein the second deformable lens is configured to change from a convex shape to a concave shape.

8. The system of claim 1 further comprising a corrective fixed lens element and wherein the corrective fixed lens element is integral with the first focus-adjustable lens and the corrective fixed lens is in contact with the deformable material of the deformable lens and configured to correct for monochromatic or polychromatic aberrations.

9. The system of claim 8 wherein the corrective fixed lens element is constructed from a rigid material.

10. The system of claim 1 wherein an aperture stop is disposed between the two deformable lenses.

11. The system of claim 1 wherein an aperture stop is disposed inside the first deformable lens.

12. The system of claim 1 further comprising a fixed, non-deformable lens disposed in the optical path, wherein the fixed non-tunable lens is constructed from a rigid material, and wherein the fixed, non-deformable lens is configured to correct for monochromatic or spherical aberrations.

13. The system of claim 1 further comprising at least one fixed, non-deformable lens disposed in the optical path, wherein the fixed focus lens is constructed from a rigid material, and wherein the at least one fixed, non-deformable lens is configured to correct for polychromatic aberrations.

14. The system of claim 1 further comprising a corrective lens disposed in the optical path, wherein the corrective lens is constructed from a rigid material, the corrective lens is disposed between a deformable lens closest to the sensor and the sensor.

15. The system of claim 3 wherein the total axial length of the optical system is reduced to a value L such that the lens is able to produce a zoom factor k for an image sensor with a diagonal d, having a ratio r=L/(k*d), the ratio r being less than approximately 0.7 while producing an image size to completely illuminate the sensor in a fully zoomed state.

16. The system of claim 1 wherein the actuation signals are selected from the group consisting of a manually generated signal and an automatically generated signal.

17. A lens system comprising:

a first deformable lens, the lens including a filler material;

a corrective optical element in contact with the filler material;

a sensor to receive the light focused by the first deformable lens;

an optical path extending through the first deformable lens and the corrective element and to the sensor;

wherein the first deformable lens is tuned according to an applied manual or electrical signal in order to directly focus light traversing the optical path onto the sensor and wherein the corrective element adjusts at least one property of the light traversing the optical path.

18. The system of claim 17 wherein the first deformable lens is tuned at least in part by an element selected from the group consisting of an electrostatic actuator, an electromagnetic actuator, a piezo motor, a magnetostrictive actuator, a stepper motor, and an electroactive polymer actuator.

19. The system of claim 17 further comprising a second deformable lens that is disposed within the optical path, the second deformable lens operates with the first adjustable lens to focus light traversing the optical path onto the sensor.

20. The system of claim 19 wherein the first deformable lens and the second deformable lens are tuned at least in part by an element selected from the group consisting of an electrostatic actuator, electromagnetic actuator, a piezo motor, a magnetostrictive actuator, a stepper motor, and an electroactive polymer actuator.

21. The system of claim 17 wherein the interface defined by the corrective optical element and the filler material has no inflection points in its shape where the design light rays pass through.