Autofocus camera using MEMS actuation of image sensor
First Claim
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1. A camera module, comprising:
- a. a MEMS electrostatic piston-tube actuator comprising;
i. a stator plate having multiple subarrays of pistons extending outwardly and perpendicular to said stator plate, wherein the pistons in each subarray of pistons being electrically connected to each other, and the pistons in each subarray of pistons being electrically insulated from the pistons in other subarrays of pistons, and wherein each subarray of pistons being electrically addressable;
ii. a rotor plate having a—
actuator-plate and an array of spaced apart through apertures or tubes surrounding said actuator-plate fabricated in the rotor plate, wherein said apertures being vertically aligned with said pistons, and wherein each said aperture having an aperture opening sized and shaped to receive and interdigitate with each said piston without the piston-walls touching the walls of said aperture during a rotation, and the walls of said apertures being electrically connected to each other,iii. a plurality of mechanical springs connecting said array of apertures to a non-moving frame, wherein during an actuation in response to electrostatic forces from a drive voltage applied between one or more subarrays of pistons and the rotor plate, the rotor translates and tilts in a defined direction;
b. an image sensor attached to said rotor, wherein said MEMS electrostatic piston-tube actuator actuates said image sensor along said optical axis to achieve autofocus in the camera module, and enables compensation of any lens tilt by rotating or tilting the sensor along the two axis forming the plane perpendicular to the optical axis;
c. a signal routings that transmit the output signals from the image sensor to the outside circuit through the mechanical springs;
d. a lens barrel containing optical lenses having an optical axis; and
e. a housing that is sized to fit and receive said MEMS actuator containing, attached said image sensor and said lens barrel.
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Abstract
A miniature camera module that achieves autofocus (AF) by applying actuation to the image sensor using MEMS (Micro Electro Mechanical System) actuators comprising of a piston-tube electrostatic actuators. The camera comprises of a MEMS piston-tube actuator, an image sensor die, an IC package, a housing, and a lens barrel. The image sensor die is attached and is electrically bonded to the moving rotor of the MEMS electrostatic piston-tube actuator, which is, in turn, attached and electrically bonded to a semiconductor device package. The packaged piston-tube actuator with the image sensor attached to it is covered with a transparent protection lid which could be an IR filter.
13 Citations
10 Claims
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1. A camera module, comprising:
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a. a MEMS electrostatic piston-tube actuator comprising; i. a stator plate having multiple subarrays of pistons extending outwardly and perpendicular to said stator plate, wherein the pistons in each subarray of pistons being electrically connected to each other, and the pistons in each subarray of pistons being electrically insulated from the pistons in other subarrays of pistons, and wherein each subarray of pistons being electrically addressable; ii. a rotor plate having a—
actuator-plate and an array of spaced apart through apertures or tubes surrounding said actuator-plate fabricated in the rotor plate, wherein said apertures being vertically aligned with said pistons, and wherein each said aperture having an aperture opening sized and shaped to receive and interdigitate with each said piston without the piston-walls touching the walls of said aperture during a rotation, and the walls of said apertures being electrically connected to each other,iii. a plurality of mechanical springs connecting said array of apertures to a non-moving frame, wherein during an actuation in response to electrostatic forces from a drive voltage applied between one or more subarrays of pistons and the rotor plate, the rotor translates and tilts in a defined direction; b. an image sensor attached to said rotor, wherein said MEMS electrostatic piston-tube actuator actuates said image sensor along said optical axis to achieve autofocus in the camera module, and enables compensation of any lens tilt by rotating or tilting the sensor along the two axis forming the plane perpendicular to the optical axis; c. a signal routings that transmit the output signals from the image sensor to the outside circuit through the mechanical springs; d. a lens barrel containing optical lenses having an optical axis; and e. a housing that is sized to fit and receive said MEMS actuator containing, attached said image sensor and said lens barrel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification