Lens control device and lens control method

a technology of lens control and control device, which is applied in the direction of dynamo-electric converter control, camera focusing arrangement, printers, etc., can solve the problems of not being able to describe the improvement of live view image and movie image, and achieve the effect of improving the appearance of live view imag

Active Publication Date: 2022-05-05
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a lens control system and method that ensures precise positioning of the lens during lens movement and enhances the appearance of live view and movie images.

Problems solved by technology

However, in patent publication 1 it is only disclosed that interference between lenses is prevented, and there is no description of improving the appearance of live view images and movie images by ensuring precision of respective lens positions during zoom drive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

case 1

[0138]If case 1 has been set in step S55, specifically, if the number of pulses of the constant speed period Tc is 0, the parameters obtained in (a) to (d) are all made 0. (since number of pulses=0, stored value for “drive time for every one pulse” representing speed is irrelevant to control)

[0139]If case 2 has been set in step S57, specifically, if the number of pulses Tn of the constant speed period Tc is 1, the following parameters are obtained. Specifically, a drive time for every one pulse Tfast for Fast within the constant speed period Tc is calculated based on equation (2) below, if constant speed period is made Tc, number of pulses of the constant speed period is made Tn, and control unit time (control resolution) is made Tres.

Tfast_t=(Tc÷Tn÷Tres)×Tres(2)

[0140]Also, in the case of case 2, a number of pulses of period Fast within the constant speed period Tc is 1, and so a number of pulses for period Slow within the constant speed period Tc is 0. Since number of pulses is 0, ...

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PUM

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Abstract

A lens control device, comprising a first stepping motor that drives a zoom lens contained in the photographing lens, a second stepping motor that drives a focus lens contained in the photographing lens, and a processor that controls the first stepping motor and the second stepping motor, whereby, within a given section in which the zoom lens and the focus lens are driven, there is a period in which at least one of the first stepping motor and the second stepping motor is driven at a constant rate, and the processor makes a time, required to move the specified section with a specified number of pulses, a specified time.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation Application of PCT Application No. PCT / JP2019 / 029417, filed on Jul. 26, 2019, the entire contents of all of which are incorporated herein by reference.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to a lens control device and a lens control method that are capable of controlling a plurality of lenses in respectively independent states, and capable of displaying and / or storing live view images and movie images while zooming.2. Description of the Related Art[0003]Conventionally, an imaging device is known in which a plurality of lens groups are driven simultaneously by individual motors. For example, the imaging device disclosed in Japanese patent laid-open No. 2010-211175 (hereafter referred to as “patent publication 1”) has a DC motor A (DCMA) for drive of a zoom lens A, a stepping motor B (STMB) for drive of a zoom lens B, and an STMC for drive of a focus lens C...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03B5/04H02P8/14
CPCG03B5/04G03B2205/0084H02P8/14G02B7/08H02P8/40G03B5/00G03B3/10G03B2205/0053G03B2205/0046
Inventor KUDO, YASUNORI
Owner OLYMPUS CORP
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