Control method of driving mechanism

Patent metadata

Field	Value
Publication number	US-11956541-B2
Application number	US-202318160069-A
Country	US
Kind code	B2
Filing date	Jan 26, 2023
Priority date	Feb 1, 2019
Publication date	Apr 9, 2024
Grant date	Apr 9, 2024

Abstract

A control method of a driving mechanism is provided, including: the driving mechanism provides a first electrical signal from a control assembly to the driving mechanism to move the movable portion into an initial position relative to the fixed portion, wherein the control assembly includes a control unit and a position sensing unit; the status signal of an inertia sensing unit is read; the control unit sends the status signal to the control unit to calculate a target position; the control unit provides a second electrical signal to the driving assembly according to the target position for driving the driving assembly; a position signal is sent from the position sensing unit to the control unit; the control unit provides a third electric signal to the driving assembly to drive the driving assembly according the position signal.

First claim

What is claimed is:

1. A control method of a driving mechanism is provided, comprising:
providing a first electrical signal from a control assembly to a driving assembly to move a movable portion to an initial position relative to a fixed portion using the driving assembly, wherein the control assembly comprises a control unit and a position sensing unit, and providing the first electrical signal comprises:
measuring a first limit value of the movable portion on a first dimension; and
measuring a second limit value of the movable portion on a second dimension, wherein the first dimension is different than the second dimension, wherein measuring the first limit value of the movable portion on the first dimension and measuring the second limit value of the movable portion on the second dimension are not performed simultaneously;

reading a status signal from an inertia sensing unit;
using the inertia sensing unit to provide the status signal to the control unit, and then use the control unit to calculate a target position;
using the control unit to provide a second electrical signal to the driving assembly according to the target position for driving the driving assembly;
providing a position signal from the position sensing unit to the control unit; and
using the control unit to provide a third electric signal to the driving assembly according to the position signal to drive the driving assembly.

2. The control method of the driving mechanism as claimed in claim 1 , wherein providing the first electrical signal from the control assembly to the driving mechanism further comprises:
determining predetermined information; and
providing the first electrical signal to the driving assembly according to the predetermined information.

3. The control method of the driving mechanism as claimed in claim 2 , wherein determining the predetermined information comprises:
establishing initial predetermined information;
providing linear compensation to the initial predetermined information to achieve compensated predetermined information;
searching for a zero value; and
testing the driving mechanism according to the compensated predetermined information and the zero value, to determine a difference between the compensated predetermined information and an actual value of the driving mechanism and a difference between the zero value and the actual value of the driving mechanism, and then determine the predetermined information by the differences.

4. The control method of the driving mechanism as claimed in claim 3 , wherein establishing the initial predetermined information further comprises:
measuring the first limit value of the movable portion on the first dimension again after measuring the second limit value of the movable portion on the second dimension.

5. The control method of the driving mechanism as claimed in claim 4 , wherein establishing the initial predetermined information further comprises:
measuring the second limit value of the movable portion on the second dimension again after measuring the first limit value of the movable portion on the first dimension again.

6. The control method of the driving mechanism as claimed in claim 3 , wherein searching for the zero value comprises:
searching for a first zero value of the movable portion on the first dimension; and
searching for a second zero value of the movable portion on the second dimension.

7. The control method of the driving mechanism as claimed in claim 6 , wherein searching for the first zero value of the movable portion on the first dimension and searching for the second zero value of the movable portion on the second dimension are performed simultaneously.

8. The control method of the driving mechanism as claimed in claim 6 , wherein searching for the first zero value of the movable portion on the first dimension and searching for the second zero value of the movable portion on the second dimension are performed sequentially.

9. The control method of the driving mechanism as claimed in claim 3 , wherein testing the driving mechanism comprises:
providing a predetermined command to the position sensing unit;
measuring the driving mechanism to gain a position signal; and
comparing the predetermined command and the position signal to get a difference value.

10. The control method of the driving mechanism as claimed in claim 9 , wherein testing the driving mechanism further comprises:
measuring the driving mechanism to gain the position signal after providing the predetermined command to the position sensing unit and after waiting for a period of time.

11. The control method of the driving mechanism as claimed in claim 9 , wherein testing the driving mechanism further comprises:
measuring a plurality of values of the position signal of the driving mechanism at different positions to get the actual value.

12. The control method of the driving mechanism as claimed in claim 9 , wherein testing the driving mechanism further comprises:
measuring read values of the position signal of the driving mechanism at different positions;
calculating calculated values of the driving mechanism at different positions according to the read values; and
combining the read values and the calculated values to get the actual value.

13. The control method of the driving mechanism as claimed in claim 9 , wherein testing the driving mechanism further comprises:
comparing the difference value to an acceptable value; and
determining the driving mechanism does not pass the test if the difference value exceeds the acceptable value.

14. The control method of the driving mechanism as claimed in claim 3 , wherein providing the linear compensation to the initial predetermined information comprises:
measuring the position of the movable portion relative to the fixed portion via an external apparatus to perform the linear compensation.

15. The control method of the driving mechanism as claimed in claim 14 , wherein measuring the position of the movable portion relative to the fixed portion via the external apparatus comprises:
providing an input signal from the external apparatus to a reference surface of the movable portion;
receiving a reflect signal reflected from the reference surface; and
calculating an angle difference between the input signal and the reflect signal to get the position of the movable portion relative to the fixed portion.

16. The control method of the driving mechanism as claimed in claim 3 , wherein determining the predetermined information further comprises:
searching for a predetermined value when searching for the zero value of the driving mechanism.

17. The control method of the driving mechanism as claimed in claim 1 , wherein reading the status signal of the inertia sensing unit comprises a filtering signal having a frequency less than 1 Hz.

18. The control method of the driving mechanism as claimed in claim 1 , further comprising:
sending position information from the position sensing unit to the control unit again after the control unit provides the third electric signal to the driving assembly according to the position signal to drive the driving assembly; and
the control unit again providing the third electric signal to the driving assembly according to the position information to drive the driving assembly.

19. The control method of the driving mechanism as claimed in claim 1 , wherein reading the status signal of the inertia sensing unit comprises a filtering signal having a frequency greater than 50 Hz.

20. The

Assignees

• Tdk Taiwan Corp

Inventors

• Hu Chao-Chang
• Fan Chen-Hsien
• Tsai Sung-Mao
• Lee Yueh-Lin
• Lo Yu-Chiao
• Hsu Mao-Kuo
• Huan Ching-Chieh
• Cheng yi-chun

Classifications

• H04N23/685 Primary

  performed by mechanical compensation · CPC title

• G03B5/02

  Lateral adjustment of lens · CPC title

• G03B13/36 Primary

  Autofocus systems · CPC title

• H04N23/57

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title

• H04N23/6812

  based on additional sensors, e.g. acceleration sensors · CPC title