Optical apparatus, display controlling method, and non-transitory computer readable storage medium storing a program, that display object distance information

Patent metadata

Field	Value
Publication number	US-10165188-B2
Application number	US-201615093153-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Apr 16, 2015
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

In an optical apparatus, when a magnification varying lens is located at a first zoom position, a display unit displays information indicative of an object distance acquired based on the electronic cam data, the first zoom position, and a position of a focusing device detected while the magnification varying lens is being located at the first zoom position. In a period for the position of the magnification varying lens to change from the first zoom position to a second zoom position, the display unit displays the information indicative of the object distance acquired based on the electronic cam data, a zoom position detected by the zoom position detector, and the position of the focusing device at the detected zoom position, which has been calculated based on the electronic cam data and the position of the focusing device corresponding to the first zoom position.

First claim

What is claimed is:

1. An optical apparatus comprising:
a focusing lens configured to move for focusing;
a magnification varying lens configured to move for magnification variation among a plurality of zoom positions, including a first zoom position, a second zoom position different from the first position, and an intermediary zoom position between the first and second zoom positions;
a memory configured to store electronic cam data, the electronic cam data being indicative of a positional relationship between the magnification varying lens and the focusing lens set for each of a predetermined number of representative object distances to maintain an in-focus state;
a display unit configured to display information indicative of an object distance;
a zoom position detector configured to detect a position of the magnification varying lens among the plurality of zoom positions;
a focus position detector configured to detect a position of the focusing lens; and
a controller configured to control the display unit to display information indicative of the object distance,
wherein when the magnification varying lens is being stopped at the first zoom position, the controller controls the display unit to display the information indicative of the object distance acquired based on the electronic cam data stored in the memory, the first zoom position, and the position of the focusing lens detected while the magnification varying lens is being stopped at the first zoom position, and
wherein in a period where the magnification varying lens moves from the first zoom position to the second zoom position, the controller controls the display unit to display the information indicative of the object distance acquired based on the electronic cam data stored in the memory, the intermediary zoom position detected by the zoom position detector, and a target position of the focusing lens to which the focusing lens is to be located when the magnification varying lens is located at the intermediary zoom position, the target position being calculated based on the electronic cam data stored in the memory and the position of the focusing lens detected while the magnification varying lens is at the first zoom position.

2. The optical apparatus according to claim 1 , wherein when the magnification varying lens is being stopped at the second zoom position, the controller controls the display unit to display the information indicative of the object distance acquired based on the electronic cam data stored in the memory, the second zoom position, and the position of the focusing lens detected when the magnification varying lens is being stopped at the second zoom position.

3. The optical apparatus according to claim 1 , wherein in a period where the magnification varying lens is being stopped, the controller calculates the object distance based on the electronic cam data stored in the memory, the position of the focusing lens detected by the focus position detector, and the position of the magnification varying lens detected by the zoom position detector, and controls the display unit to display the information indicative of the calculated object distance.

4. The optical apparatus according to claim 3 , wherein:
when a moving speed of the magnification varying lens is higher than a predetermined speed in the period where the magnification varying lens moves from the first zoom position to the second zoom position, the controller controls the display unit to display the information indicative of the object distance acquired based on the electronic cam data stored in the memory, the zoom position detected by the zoom position detector, and the position of the focusing lens at the detected zoom position calculated based on the electronic cam data stored in the memory and the position of the focusing lens corresponding to the first zoom position, and
when the moving speed of the magnification varying lens is equal to or lower than the predetermined speed, the controller calculates the object distance based on the electronic cam data stored in the memory, the position of the focusing lens detected by the focus position detector, and the position of the magnification varying lens detected by the zoom position detector, and controls the display unit to display the information indicative of the calculated object distance.

5. The optical apparatus according to claim 3 , further comprising:
a focus driving operation unit configured to drive the focusing lens,
wherein when the controller receives a driving command of the focusing lens in the period where the magnification varying lens moves from the first zoom position to the second zoom position, the controller calculates the object distance based on the electronic cam data stored in the memory, the focus position detected by the focus position detector, and the zoom position detected by the zoom position detector, and controls the display unit to display information indicative of the calculated object distance.

6. An optical apparatus comprising:
a focusing lens configured to move for focusing;
a magnification varying lens configured to move for magnification variation among a plurality of zoom positions, including a first zoom position, a second zoom position different from the first position, and an intermediary zoom position between the first and second zoom positions;
a memory configured to store electronic cam data, the electronic cam data being indicative of a positional relationship between the magnification varying lens and the focusing lens set for each of a predetermined number of representative object distances to maintain an in-focus state;
a display unit configured to display information indicative of an object distance;
a zoom position detector configured to detect a position of the magnification varying lens among the plurality of zoom positions;
a focus position detector configured to detect a position of the focusing lens; and
a controller configured to control the display unit to display information indicative of the object distance,
wherein when the magnification varying lens is being stopped at the first zoom position, the controller controls the display unit to display the information indicative of the object distance acquired based on the electronic cam data stored in the memory, the first zoom position, and the position of the focusing lens detected while the magnification varying lens is being stopped at the first zoom position, and
wherein in a period where the magnification varying lens moves from the first zoom position to the second zoom position, the controller controls the display unit to display the information indicative of the object distance acquired when the magnification varying lens is being stopped at the first zoom position.

7. The optical apparatus according to claim 6 , wherein the controller stops updating the information indicative of the object distance in a period where the magnification varying lens moves from the first zoom position to the second zoom position.

8. The optical apparatus according to claim 6 , wherein when the magnification varying lens is being stopped at the second zoom position, the controller controls the display unit to display the information indicative of the object distance acquired based on the electronic cam data stored in the memory, the second zoom position, and the position of the focusing lens detected when the magnification varying lens is being stopped at the second zoom position.

9. The optical apparatus according to claim 6 , wherein in a period where the magnification varying lens is being stopped, the controller calculates the object distance based on the electronic cam data stored in the memory, the position of the focusing lens detecte

Assignees

• Canon Kk

Inventors

• Kakimoto Takeshi

Classifications

• G03B17/14

  interchangeably · CPC title

• G02B7/285 Primary

  including two or more different focus detection devices, e.g. both an active and a passive focus detecting device · CPC title

• G02B7/102 Primary

  controlled by a microcomputer (cameras with interchangeable lenses G03B17/14) · CPC title

• H04N23/69 Primary

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

• H04N23/67

  Focus control based on electronic image sensor signals · CPC title