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Self-calibration ring compensation of automatic focus actuator used for camera module

A technology of automatic focusing and camera module, which is used in focusing devices, instruments, image communication, etc.

Active Publication Date: 2013-01-02
MAXIM INTEGRATED PROD INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such an overshoot-oscillation-stabilization process can take up to 100-200 milliseconds (i.e., 5-10 oscillation cycles) of stabilization time to complete each lens positioning substep in closed-loop autofocus
This stabilization time may not be suitable for most modern camera modules capable of capturing still images and video frames at a fast autofocus rate

Method used

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  • Self-calibration ring compensation of automatic focus actuator used for camera module
  • Self-calibration ring compensation of automatic focus actuator used for camera module
  • Self-calibration ring compensation of automatic focus actuator used for camera module

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Embodiment Construction

[0026] In the ensuing description, for purposes of explanation, specific details are set forth in order to provide an understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these details. Those skilled in the art will appreciate that the embodiments of the invention described below can be implemented in various ways and using various structures. Those skilled in the art will also appreciate that additional modifications, applications, and implementations are within the scope of the invention, as the invention may provide additional fields of use. Accordingly, the embodiments described below are illustrative of specific embodiments of the invention and are intended to avoid obscuring the invention.

[0027] Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, characteristic, or function described in connection with the embodi...

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Abstract

The invention relates to an actuator driver in a camera module, more specifically, to a method, a system and a device utilizing the self-calibration ring compensation to improve the self focus rate of the camera module driven by the actuator. The oscillating characteristic of the actuator is calibrated, thereby controlling the sink current driving the actuator in the automatic focus period. The actuator driver includes a digital-analog converter (DAC), a filter, a current absorber and a self-calibration module. The self-calibration module calibrates free oscillation frequency and damping coefficient. Correspondingly, the DAC generates voltage that can be filtered or reshaped by a bypass of the filter later. The voltage is converted into the sink current further by the current absorber. Therefore, the self-calibration ring compensation can trace free oscillation closely and can improve the stable period of lens and improve the automatic focus rate of the camera module efficiently.

Description

[0001] Cross References to Related Applications : This application was filed on June 29, 2011 under 35 U.S.C.§119(e), entitled "Self-Calibrated Ringing Compensation for an Autofocus Actuator in a Camera Module" in a Camera Module)"; and "Self-Calibrated Ringing Compensation for an Autofocus Actuator in a Camera Module" filed June 26, 2012 Ringing Compensation for an Autofocus Actuator in a Camera Module), the subject matter of which and the non-provisional application are incorporated herein by reference. technical field [0002] The present invention relates generally to actuator drivers in camera modules and, more particularly, to improving the automatic operation of camera modules based on voice coil motors (VCM) or other actuators with resonant behavior using self-calibrating ringing compensation. Focus on convergence time. The free running frequency and damping coefficient of the VCM are calibrated and used to control the sink current driving the VCM. Background techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B5/00G03B13/36H02K33/18G03B17/12H04N5/232
Inventor F·B·克里斯托A·加利姆伯蒂
Owner MAXIM INTEGRATED PROD INC
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