Optical apparatus, its control method, and storage medium

Patent metadata

Field	Value
Publication number	US-12117667-B2
Application number	US-202318491851-A
Country	US
Kind code	B2
Filing date	Oct 23, 2023
Priority date	Oct 9, 2019
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

Abstract

An optical apparatus includes a first driver configured to move a focus lens in an optical axis direction, a second driver configured to move a first driver in the optical axis direction, and a controller configured to control driving of the first driver according to a moving amount of the first driver by the second driver.

First claim

What is claimed is:

1. An optical apparatus comprising:
a first driver configured to move a focus lens in an optical axis direction;
a second driver configured to move the first driver in the optical axis direction;
a position detector configured to detect a position of the focus lens; and
a controller configured to control driving of the first driver,
wherein both the first driver and the second driver move the focus lens during zooming, and
wherein the controller controls driving of the first driver based on a moving amount of the first driver by the second driver and the position of the focus lens detected by the position detector.

2. The optical apparatus according to claim 1 , wherein the controller determines a first target focus position that is a target position of the focus lens using first data relating to an in-focus position of the focus lens corresponding to the zoom position and an estimated zoom position that is estimated to be a zoom position after a predetermined time passes, and
wherein the controller controls driving of the first driver using the first target focus position and a first moving amount that is estimated to be a moving amount of the first driver by the second driver after the predetermined time passes.

3. The optical apparatus according to claim 2 , wherein the controller calculates a driving amount of the focus lens by the first driver based on the position of the focus lens detected by the position detector, the first target focus position, and the first moving amount, and controls driving of the first driver based on the driving amount.

4. The optical apparatus according to claim 1 , wherein the first driver includes a movable part configured to move the focus lens,
wherein the controller determines a first target driving position that is a target position of the focus lens within a movable range of the focus lens in the first driver using second data relating to an in-focus position of the movable part of the first driver corresponding to the zoom position, and an estimated zoom position that is estimated to be a zoom position after a predetermined time passes, and
wherein the controller controls driving of the first driver using the first target driving position and a second moving amount as a moving amount of the first driver by the second driver.

5. The optical apparatus according to claim 4 , wherein the controller calculates a current position of the focus lens within a movable range of the focus lens in the first driver using the second moving amount and the position of the focus lens detected by the position detector, and controls driving of the first driver based on the first target driving position and the current position.

6. The optical apparatus according to claim 1 , wherein the controller controls driving of the first driver using the position of the focus lens detected by the position detector and a second target focus position that is a target position of the focus lens, and
wherein the second target focus position is determined based on a second moving amount as a moving amount of the first driver by the second driver and the second target driving position that is the target position of the focus lens within a movable range of the focus lens in the first driver.

7. The optical apparatus according to claim 6 , wherein the controller controls driving of the first driver based on a deviation between the position of the focus lens detected by the position detector and the second target focus position.

8. The optical apparatus according to claim 1 , wherein the controller controls driving of the first driver using a second target driving position that is a target position of the focus lens within a movable range of the focus lens in the first driver, and a current position of the focus lens within a movable range of the focus lens in the first driver, and
wherein the current position is calculated using a second moving amount as a moving amount of the first driver by the second driver, and the position of the focus lens detected by the position detector.

9. The optical apparatus according to claim 8 , wherein the controller controls driving of the first driver based on a deviation between the current position and the second target driving position.

10. The optical apparatus according to claim 6 , further comprising a movable part detector configured to detect a position of a movable part relative to a base part in the first driver,
wherein the controller acquires the second moving amount using the position of the focus lens detected by the position detector and the position of the movable part detected by the movable part detector.

11. The optical apparatus according to claim 1 , wherein the first driver includes a motor, and
wherein the second driver includes a cam mechanism configured to move the first driver by a cam.

12. The optical apparatus according to claim 1 , wherein each of the first driver and the second driver includes a motor.

13. A control method of an optical apparatus that includes a first driver configured to move a focus lens in an optical axis direction, a second driver configured to move the first driver in the optical axis direction, and a position detector configured to detect a position of the focus lens moved by both the first driver and the second driver during zooming, the control method comprising the steps of:
acquiring a moving amount of the first driver by the second driver; and
controlling driving of the first driver based on the moving amount of the first driver by the second driver and the position of the focus lens detected by the position detector.

14. A non-transitory computer-readable storage medium storing a computer program that causes to execute a control method a computer in an optical apparatus that includes a first driver configured to move a focus lens in an optical axis direction, a second driver configured to move the first driver in the optical axis direction and a position detector configured to detect a position of the focus lens moved by both the first driver and the second driver during zooming,
wherein the control method comprising the steps of:
acquiring a moving amount of the first driver by the second driver; and
controlling driving of the first driver based on the moving amount of the first driver by the second driver and the position of the focus lens detected by the position detector.

Assignees

• Canon Kk

Inventors

• Homma Taiki
• Maruyama Satoshi

Classifications

• G02B7/14

  adapted to interchange lenses {(G02B7/027 takes precedence)} · CPC title

• G02B7/10

  by relative axial movement of several lenses, e.g. of varifocal objective lens · CPC title

• H04N23/69

  Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming · CPC title

• H04N23/672

  based on the phase difference signals · CPC title

• H04N23/54

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title