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Driving control apparatus, system and method, lens apparatus, and memory medium

A technology of actuators and vibrators, applied in projection devices, printing devices, focusing devices, etc., can solve problems such as increased power consumption

Pending Publication Date: 2021-06-18
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although frequency control can suppress vibrations in the direction perpendicular to the direction of travel, power consumption may increase

Method used

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  • Driving control apparatus, system and method, lens apparatus, and memory medium
  • Driving control apparatus, system and method, lens apparatus, and memory medium
  • Driving control apparatus, system and method, lens apparatus, and memory medium

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0026] figure 1 is a block diagram showing the drive control system 101 according to the present embodiment. The drive control system 101 includes a drive control device 102 , a detector 111 and a vibration actuator 112 .

[0027] figure 2 is a block diagram showing the vibration actuator 112 according to the present embodiment. The vibration actuator 112 includes a contact body 201 and a vibrator 205 . The contact body 201 and the vibrator 205 are pressurized and brought into contact with each other. The vibrator 205 includes a metal elastic body 203 having a protrusion 202 and an electromechanical energy conversion element (piezoelectric element) 204 joined to the metal elastic body 203 . A two-phase drive signal having a phase difference and changing periodically is applied to the piezoelectric element 204, thereby causing vibration of an elliptical motion. The drive signal is a square wave signal, and the ratio of the pulse width of the square wave to one period is c...

no. 2 example

[0054] Figure 6 is a block diagram showing the drive control system 101 according to the present embodiment. The controller 103 of the present embodiment includes a phase difference duty ratio interlock control execution determiner 601 . The phase difference duty ratio interlock control execution determiner 601 is configured to determine whether to determine the duty ratio according to the phase difference according to a situation where the vibration actuator 112 is to be operated or according to an operation mode in which the vibration actuator 112 is to be operated. Since other configurations of the drive control system 101 of the present embodiment are the same as those of the drive control system 101 of the first embodiment, a detailed description thereof will be omitted.

[0055] Figure 7 is a block diagram showing a lens-interchangeable digital single-lens reflex camera which is an example of an imaging device having a drive control system 101 . In the present embod...

no. 3 example

[0091] Figure 10 is a block diagram of the drive control system 101 of this embodiment. When the focus lens unit 753 is driven at a low speed, stopping precision is required while suppressing unnecessary vibrations. However, the stopping accuracy may deteriorate due to friction etc. In the present embodiment, the controller 103 includes a deceleration state determiner 1001 configured to determine the operating state of the vibration actuator 112 so that the vibration actuator 112 stops at the stop position with high precision. The controller 103 is configured to use the determination result of the deceleration state determiner 1001 to determine whether it is necessary to decelerate the vibration actuator 112 from the current speed. Since other configurations of the drive control system 101 of the present embodiment are the same as those of the drive control system 101 of the first embodiment, a detailed description thereof will be omitted. Since the configuration of the di...

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PUM

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Abstract

The invention relates to a driving control apparatus, system and method, a lens apparatus, and a memory medium. The driving control apparatus controls an actuator that relatively moves a vibrator and a contact body contacting the vibrator, the vibrator being made to generate vibration by applying a first signal and a second signal having a phase difference. The driving control apparatus includes a first determination unit configured to determine the phase difference; and a second determination unit configured to determine a voltage amplitude of electric power supplied to the actuator such that the voltage amplitude decreases as an absolute value of the phase difference decreases.

Description

technical field [0001] The invention relates to a drive control device, a drive control system, a lens device, a drive control method and a storage medium. Background technique [0002] The vibration actuator includes a vibrator which is caused to vibrate such as an elliptical motion by applying a two-phase frequency signal having a phase difference, and which relatively moves with a contact body in contact with the vibrator. As a method for controlling the driving of the vibration actuator, there are known a frequency control of changing the frequency of two-phase frequency signals and a method of phase difference control of changing the phase difference of the two-phase frequency signals. Frequency control and phase difference control are often used to drive vibration actuators at high and low speeds, respectively. [0003] Japanese Patent Laid-Open ("JP") No. 2014-153497 discloses a lens barrel in which, when the phase difference is changed when driving is started, the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/34G02B7/09G02B7/10
CPCG03B13/34G02B7/09G02B7/102G03B13/36G03B3/10G03B5/00G03B2205/0046G03B2205/0061G02B7/08H02N2/062H02N2/001G02B7/04
Inventor 池田享浩
Owner CANON KK