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Position control device, position control method, drive device and imaging device

A technology of control device and control unit, which is applied in the direction of installation, machine/engine, mechanism for generating mechanical power, etc., and can solve problems such as inability to control the position to the desired position, time loss, and complex system design

Inactive Publication Date: 2011-04-27
KONICA MINOLTA OPTO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] If such abnormality processing is provided in the drive device or the position control device of the drive device, the system design of the drive device or the position control device becomes complicated, and time for abnormal processing such as control stop, restart, and reposition control operation is required, time loss
On the other hand, if the position control is simply restarted without setting exception handling in these devices, the devices will operate in the same way, and as a result, there is a high possibility that the abnormal state will occur again and the position control will not be able to reach the desired position.

Method used

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  • Position control device, position control method, drive device and imaging device
  • Position control device, position control method, drive device and imaging device
  • Position control device, position control method, drive device and imaging device

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no. 1 approach

[0046] In this embodiment, the case where the position control device and drive device according to the present invention are applied to an imaging device will be described, but the position control device and drive device according to the present invention are not limited to the case of being applied to an imaging device. Can be applied alone or applied to other devices. In particular, it is desirable to use it in a device suitable for the characteristics of a shape memory alloy actuator. A shape memory alloy actuator, as one of its features, is quiet in operation and can obtain a relatively large torque (torque) for its size (dimension), and thus is applied to a mobile terminal such as a mobile phone. It is ideal for a relatively small camera device, and it is more ideal for driving its optical system. In view of this situation, in this embodiment, a position control device and a drive device applied to an imaging device will be described.

[0047] figure 1 It is a block...

no. 2 approach

[0094] Figure 7 It is a block diagram showing the configuration of the position control device according to the second embodiment. The position control device 1B according to the second embodiment as the position control unit 1 includes the control unit, the detection unit, and the change unit, and in this embodiment, the change unit includes: A second storage unit for an offset value, a second calculation unit for changing the compensation value so as to lower the temperature of the SMA component 21 and obtain the changed compensation value, and when the detection unit determines that the electric quantity exceeds the threshold value , a second rewriting unit that rewrites the compensation value stored in the second storage unit into the changed compensation value obtained by the second calculation unit, wherein the control unit includes: compensating the instruction with the compensation value stored in the second storage unit A compensating unit for the value, and a secon...

no. 3 approach

[0118] Figure 10 It is a block diagram showing the configuration of the position control device according to the third embodiment. The position control device 1C according to the third embodiment as the position control unit 1 includes the control unit, the detection unit, and the change unit, and in this embodiment, the change unit includes: a storage limit value, a third calculation unit for changing the threshold value in order to lower the temperature of the SMA component 21 and obtain the change threshold value, and when it is determined by the detection unit that the electric quantity exceeds the threshold value, it will be stored in the first 3. The third rewriting unit that rewrites the limit value of the storage unit into the change limit value obtained by the third calculation unit, and the control unit includes: comparing the indicated value with the limit value stored in the third storage unit and selecting a smaller one. A value selection unit, and a third contr...

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Abstract

A position control device (1) and a position control method are used for shape memory alloy actuators that move movable members by means of a shape memory alloy. In controlling the position of the movable member, when the amount of power supplied to the shape memory alloy member exceeds a prescribed first threshold, a specified value, which represents the position of the movable member as a control target, is changed so that the temperature of the shape memory alloy member is reduced. The drive device and the imaging device (C) are provided with a shape memory alloy actuator and the position-controlling device (1).

Description

technical field [0001] The present invention relates to a position control device and a position control method suitable for use in, for example, a shape memory alloy actuator (shape memory alloy actuator) that uses a shape memory alloy to move a movable member by a bias applying method. , to control the position of the movable part. It also relates to a driving device and an imaging device including the above-mentioned position control device and a shape memory alloy actuator. Background technique [0002] Shape memory alloy (Shape Memory Alloy, hereinafter referred to as "SMA") has a crystal structure called austenite phase (parent phase) at a high temperature higher than the phase transition temperature. In a low-temperature state at a transformation temperature, a crystal structure called a martensite phase is formed. General metallic materials cannot return to their pre-deformed shape if a specified external force is applied, but SMA deforms from the martensitic phase...

Claims

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Application Information

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IPC IPC(8): F03G7/06G02B7/04
CPCG02B7/08F03G7/065
Inventor 本多泰启
Owner KONICA MINOLTA OPTO