Optical device comprising a motor and a cam for adjusting the optical device

1 . An optical device comprising:

an optical element,

a motor, and

a cam,

wherein the motor is configured to rotate the cam so that the cam interacts with the optical element to adjust a parameter of the optical element,

the motor ( 5 ) comprises an encoder ( 52 ) configured to provide an output signal indicative of a position of the cam ( 4 ), and the optical element comprises a container, wherein the container comprises a first wall and an opposing second wall, and wherein the optical device comprises a sensor arranged on an arm ( 70 ) of the optical element ( 10 ) to measure a position of the second wall ( 30 ) of the optical element ( 10 ), wherein the first wall comprises a circumferential support frame and an elastically deformable membrane that is connected to the support frame of the first wall, and wherein the second wall comprises a circumferential support frame, and wherein the support frame of the second wall is pivotably mounted to the support frame of the first wall, and the cam is configured to contact a contact surface ( 70 a ) of the support frame of the second wall ( 30 ) so that when the cam is rotated by the motor ( 5 ) it pivots the support frame of the second wall ( 30 ) towards and away from the support frame of the first wall ( 20 ) about an axis distal to an optical axis (A) of the optical device.

2 . The optical device according to claim 1 , wherein the optical element is a lens, and wherein the parameter is a focal length of the lens.

3 . The optical device according to claim 1 , wherein each wall comprises a transparent portion, and wherein the container is filled with a transparent liquid arranged between the transparent portions of the walls.

4 . The optical device according to claim 3 , wherein the first wall comprises a rigid transparent cover element that is connected to the support frame of the first wall, wherein the cover element forms the transparent portion of the first wall; and wherein the second wall comprises an elastically deformable membrane that is connected to the support frame of the second wall, wherein the membrane forms the transparent portion of the second wall.

5 . The optical device according to claim 3 , wherein the membrane forms the transparent portion of the first wall; and wherein the second wall comprises a rigid transparent cover element that is connected to the support frame of the second wall, wherein the cover element forms the transparent portion of the second wall.

6 . The optical device according to claim 4 , wherein the cam is configured to interact with the container to adjust a curvature of the membrane and thereby the parameter of the optical element.

7 . The optical device according to claim 5 , wherein the motor is mounted to the support frame of the first wall via at least one motor mount connected to the support frame of the first wall, wherein the at least one motor mount encompasses a housing of the motor along a periphery of the housing.

8 . The optical device according to claim 3 , wherein the first and the second wall are connected to one another by a flexible lateral wall of the container, wherein the lateral wall ( 60 ) forms a bellows.

9 . The optical device according to claim 3 , wherein the cam is configured to press against a contact surface connected to the second wall so that when the cam is rotated by the motor the second wall is pivoted away or towards the first wall to adjust the curvature of the membrane and therewith the parameter of the optical element.

10 . Optical device according to claim 1 , wherein the optical device comprises a pump reservoir, wherein the cam is configured to actuate the pump reservoir to pass liquid from the pump reservoir into the container so as to adjust the parameter of the optical element.

11 . Optical device according to claim 1 , wherein the optical parameter of the optical element is adjustable within a tuning range of the parameter, wherein the cam is configured such that when the cam is rotated by the motor, a torque acting on the cam is constant within the tuning range.

12 . Optical device according to claim 1 , characterized in that each wall comprises a transparent portion, and wherein the container is filled with a transparent liquid arranged between the transparent portions of the walls, and wherein the arm is connected to the support frame of the second wall.

13 . Optical device according to claim 1 , wherein the motor comprises a drive shaft that is rotatable by the motor about a rotation axis, and wherein the cam comprises an excentric member arranged on the drive shaft, and wherein the cam further comprises a bearing arranged on the excentric member, which bearing is configured to contact the contact surface.

14 . Optical device according to claim 1 , wherein the optical device is configured to adjust the parameter of the optical element to assume one of a plurality of discrete parameter values, wherein the cam comprises for each of the discrete parameter values a region, wherein the respective region of the cam is configured to contact the contact surface so that the associated discrete parameter value is assumed by the optical element, wherein the respective region is adapted such that a torque acting on the cam when the respective region contacts the contact surface vanishes or corresponds to a local minimum of the torque.

15 . Optical device according to claim 1 , wherein the optical device comprises a clutch configured to decouple the cam from the motor and/or wherein the optical device comprises a brake configured to act on the rotation axis or on the drive shaft.

16 . Optical device according to claim 1 , wherein the optical device comprises a further optical element and a further cam, wherein the motor is configured to rotate the further cam so that the further cam interacts with the further optical element to adjust a parameter of the further optical element, the further optical element is a further lens, and wherein the parameter of the further optical element is a focal length of the further lens, and wherein the cam and the further cam are configured such that the parameters of the lens and of the further lens are one of: individually adjusted, adjusted such that they are identical to one another, adjusted such that they are reciprocal to one another.

17 . Optical device according to claim 9 , wherein the contact surface is formed by an arm, wherein the arm or a part of the optical device, which part is particularly connected to the arm, comprises at least a portion formed out of a material that has a thermal expansion characteristic that causes the second wall to move relative to the first wall for a given position of the cam through an operation temperature of the optical device, wherein the material of said portion and its geometry is selected such that said movement of the second wall compensates a thermal expansion of the liquid in the container so as to reduce a drift of the focal length of the lens.

18 . Optical device according to claim 1 , wherein the optical device comprises a worm drive which couples the motor to the cam.

19 . An optical device comprising:

an optical element,

a motor, and

a cam,

wherein the motor is configured to rotate the cam so that the cam interacts with the optical element to adjust a parameter of the optical element,

the motor ( 5 ) comprises an encoder ( 52 ) configured to provide an output signal indicative of a position of the cam ( 4 ), and the optical element comprises a container, wherein the container comprises a first wall and an opposing second wall, and wherein the optical device comprises a sensor arranged on an arm ( 70 ) of the optical element ( 10 ) to measure a position of the second wall ( 30 ) of the optical element ( 10 ), wherein the first wall comprises a circumferential support frame and an elastically deformable membrane that is connected to the support frame of the first wall, and wherein the second wall comprises a circumferential support frame, and wherein the support frame of the second wall is pivotably mounted to the support frame of the first wall via two axially aligned bearings, and the cam is configured to contact a contact surface ( 70 a ) of the support frame of the second wall ( 30 ) so that when the cam is rotated by the motor ( 5 ) it pivots the second wall ( 30 ) towards and away from the first wall ( 20 ).