Control apparatus, lens apparatus, control method, and storage medium

Patent metadata

Field	Value
Publication number	US-11789340-B2
Application number	US-202217903428-A
Country	US
Kind code	B2
Filing date	Sep 6, 2022
Priority date	Sep 28, 2021
Publication date	Oct 17, 2023
Grant date	Oct 17, 2023

Abstract

A control apparatus for a lens apparatus to be detachably attached to an image pickup apparatus and including first and second focus lenses that are independently movable during focusing includes an acquisition unit for acquiring optical data that include information on a focus sensitivity of the first focus lens, and information on a focus sensitivity of the second focus lens, and a calculation unit for calculating a moving speed of the first focus lens using a target image plane speed acquired from the image pickup apparatus, target positions of the first and second focus lenses, current positions of the first and second focus lenses, and the optical data, and to calculate a moving speed of the second focus lens using the target positions of the first and second focus lenses, and the current positions of the first and second focus lenses.

First claim

What is claimed is:

1. A control apparatus configured to control a lens apparatus that is attachable to and detachable from an image pickup apparatus and includes a first focus lens and a second focus lens that are independently movable during focusing, the control apparatus comprising at least one processor, and a memory coupled to the at least one processor, the memory having instructions that, when executed by the processor, performs operations as:
an acquisition unit configured to acquire optical data that include information on a focus sensitivity of the first focus lens, and information on a focus sensitivity of the second focus lens; and
a calculation unit configured to calculate a moving speed of the first focus lens using a target image plane speed acquired from the image pickup apparatus, target positions of the first focus lens and the second focus lens, current positions of the first focus lens and the second focus lens, and the optical data, and to calculate a moving speed of the second focus lens using the target positions of the first focus lens and the second focus lens, and the current positions of the first focus lens and the second focus lens.

2. The control apparatus according to claim 1 , wherein the information on the focus sensitivity of the first focus lens includes information on a plurality of first zones according to the position of the first focus lens and the focus sensitivity of the first focus lens for each of the plurality of first zones, and
wherein the information on the focus sensitivity of the second focus lens includes information on a plurality of second zones according to the position of the second focus lens and corresponding to the plurality of first zones, and the focus sensitivity of the second focus lens for each of the plurality of second zones.

3. The control apparatus according to claim 2 , wherein the calculation unit calculates the moving speed of the first focus lens and the moving speed of the second focus lens at a timing when at least one of the first focus lens and the second focus lens is moved to a different zone.

4. The control apparatus according to claim 1 , wherein the calculation unit calculates the moving speed of the first focus lens and the moving speed of the second focus lens further using an error between the position of the second focus lens when the first focus lens is moved to a predetermined position and a position corresponding to the predetermined position.

5. The control apparatus according to claim 1 , wherein the calculation unit calculates the moving speed of the first focus lens and the moving speed of the second focus lens further using acceleration conditions of the first focus lens and the second focus lens.

6. The control apparatus according to claim 1 , wherein the lens apparatus further includes:
a first driving unit configured to drive the first focus lens; and
a second driving unit configured to drive the second focus lens,
wherein each of the first driving unit and the second driving unit includes a transmission mechanism using gears, and
wherein in a case where at least one of moving directions of the first focus lens and the second focus lens is reversed, the calculation unit calculates the moving speed of the first focus lens and the moving speed of the second focus lens further using idleness of the transmission mechanism.

7. A lens apparatus attachable to and detachable from an image pickup apparatus, the lens apparatus comprising:
an optical system that includes a first focus lens and a second focus lens that are independently movable during focusing; and
a control apparatus configured to control the lens apparatus,
wherein the control apparatus includes at least one processor, and a memory coupled to the at least one processor, the memory having instructions that, when executed by the processor, performs operations as:
an acquisition unit configured to acquire optical data that include information on a focus sensitivity of the first focus lens, and information on a focus sensitivity of the second focus lens; and
a calculation unit configured to calculate a moving speed of the first focus lens using a target image plane speed acquired from the image pickup apparatus, target positions of the first focus lens and the second focus lens, current positions of the first focus lens and the second focus lens, and the optical data, and to calculate a moving speed of the second focus lens using the target positions of the first focus lens and the second focus lens, and the current positions of the first focus lens and the second focus lens.

8. A control method configured to control a lens apparatus that is attachable to and detachable from an image pickup apparatus and includes a first focus lens and a second focus lens that are independently movable during focusing, the control method comprising the steps of:
acquiring optical data that include information on a focus sensitivity of the first focus lens, and information on a focus sensitivity of the second focus lens; and
calculating a moving speed of the first focus lens using a target image plane speed acquired from the image pickup apparatus, target positions of the first focus lens and the second focus lens, current positions of the first focus lens and the second focus lens, and the optical data, and to calculate a moving speed of the second focus lens using the target positions of the first focus lens and the second focus lens, and the current positions of the first focus lens and the second focus lens.

9. A storage medium storing a program that causes a computer of a lens apparatus to execute the control method according to claim 8 .

Assignees

• Canon Kk

Inventors

• Maruyama Satoshi

Classifications

• G03B13/36 Primary

  Autofocus systems · CPC title

• H04N23/67

  Focus control based on electronic image sensor signals · CPC title

• H04N23/672

  based on the phase difference signals · 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