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Actuator ring characteristic measurement method

A technology of actuators, characteristics, used in instruments, still cameras, televisions, etc., to solve problems such as adverse effects of video image capture, inability to damp vibration or ringing

Inactive Publication Date: 2017-04-26
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, video image capture can also be adversely affected by lens ringing at the frame rates at which most video is recorded
Existing solutions do not adequately dampen vibration or ringing during a single ringtone cycle

Method used

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  • Actuator ring characteristic measurement method
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Examples

Experimental program
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Embodiment Construction

[0035] In the following description, specific details are provided to facilitate a thorough understanding of examples. However, one of ordinary skill in the art would understand that the described examples may be practiced without these specific details. For example, electrical components / devices may be shown in block diagrams in order not to obscure the examples with unnecessary detail. In other instances, such components, other structures and techniques may be shown in detail to further explain the examples.

[0036] It should also be noted that the examples may be described as a process, which is depicted as a flowchart, flow diagram, finite state diagram, structure diagram, or block diagram. Although a flowchart may describe operations as a sequential process, many operations may be performed in parallel or simultaneously, and the process may be repeated. Furthermore, the order of operations may be rearranged. A process terminates when its operations are complete. A pr...

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PUM

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Abstract

Methods and systems are disclosed for determining at least one actuation characteristic of an imaging device. For example, one method includes determining a target distance to move a lens by an actuator to focus a scene on an image sensor, where moving the lens by the actuator causes an associated lens vibration having at least one actuation characteristic, determining a scan sequence having a plurality of successive measurements, each measurement having at least a first measurement parameter and subsequent measurement parameter, each measurement parameter including at least one step and at least one time delay, moving the lens the target distance for each successive measurement based on the measurement parameters of each successive measurement, measuring a performance indicator of each successive measurement, and determining at least one actuation characteristic based on the first measurement parameter of the measurement having the highest performance indicator.

Description

technical field [0001] Embodiments of the present invention relate to imaging devices, and in particular to methods and apparatus for determining actuator vibration characteristics for reducing ringing, damping vibrations, and reducing time to autofocus an imaging device. Background technique [0002] Digital imaging devices with adjustable focus can employ one of many types of lens actuators, including voice coil motor (VCM) actuators, microelectromechanical system (MEMS) actuators, or shape memory alloy (SMA) actuators. actuators etc. The image capture device may also have a lens driver controlling an actuator that moves the lens assembly for adjusting focus in the image capture device. During operation of the actuator to adjust the position of the lens, vibrations may be introduced to the lens. [0003] This vibration can come from many sources. For example, in a lens adjustment mechanism designed with a voice coil motor, the excitation for movement of the lens induces...

Claims

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Application Information

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IPC IPC(8): G02B27/64
CPCG02B27/646H04N23/67H04N23/682H04N23/68H04N23/687H04N23/6812G03B13/36H04N2101/00H04N2201/0428H04N2201/046
Inventor 千石正一郎
Owner QUALCOMM INC