Optical apparatus

Patent metadata

Field	Value
Publication number	US-9007510-B2
Application number	US-201213613009-A
Country	US
Kind code	B2
Filing date	Sep 13, 2012
Priority date	Sep 15, 2011
Publication date	Apr 14, 2015
Grant date	Apr 14, 2015

Abstract

An optical apparatus is configured to execute a manual focus mode in which focusing is performed by an operation of a manual operating unit by moving an image pickup optical system configured to form an optical image of an object. The optical apparatus includes a diaphragm configured to adjust a light quantity, and a controller configured to control a movement of the image pickup optical system in accordance with an operating amount of the manual operating unit so that a unit moving amount that is a moving amount of an in-focus position of the image pickup optical system per unit operation of the manual operating unit corresponds to a product between a diameter of a minimum confusion circle of the image pickup optical system, a diaphragm value of the diaphragm in the manual focus mode, and a coefficient that is a natural number or a reciprocal of the natural number.

First claim

What is claimed is:

1. An optical apparatus comprising:
a diaphragm configured to adjust a light quantity;
an image pickup optical system including a focus lens unit that moves during focusing and configured to form an optical image of an object;
a manual operating unit configured to manually operate a movement of the focus lens unit in a manual focus mode; and
a controller configured to control a movement of the focus lens unit in accordance with an operating amount of the manual operating unit by allowing setting of, as a unit moving amount that is a moving amount of an in-focus position of the image pickup optical system per unit operation of the manual operating unit, a value based on a product between a depth of focus and a coefficient that is a natural number or a reciprocal of the natural number,
wherein the controller sets the coefficient larger when a distance between an in-focus position of the focus lens unit with respect to the object and a current position of the focus lens unit is larger than a predetermined threshold than when the distance is smaller than the predetermined threshold.

2. The optical apparatus according to claim 1 , wherein the manual operating unit includes a touch screen for moving the focus lens unit according to a touch operation by a user.

3. The optical apparatus according to claim 1 , further comprising:
an image pickup element configured to provide a photoelectric conversion for the optical image formed by the image pickup optical system; and
a display unit configured to display an image based upon an signal output from the image pickup element,
wherein the controller is configured to select an image pickup mode, which includes a live-view image pickup mode used to sequentially display and capture images based upon the signal output from the image pickup element.

4. The optical apparatus according to claim 3 , wherein the display unit magnifies and displays the area to be focused, which has been set.

5. The optical apparatus according to claim 3 , wherein the manual operating unit is provided to a predetermined area displayed on the display unit.

6. The optical apparatus according to claim 1 , wherein the manual operating unit is a dial and the unit operation is a rotation of the dial.

7. The optical apparatus according to claim 1 , wherein the manual operating unit is an electronic ring that is rotatably provided on a lens barrel that houses the image pickup optical system, and the operation of the manual operating unit is a rotation of the electronic ring.

8. The optical apparatus according to claim 1 , wherein the optical apparatus includes a camera body and an exchange lens that is attachable to and detachable from the camera body.

Assignees

• Ochi Daisuke
• Nagao Yuki
• Koyama Atsushi
• Mizushima Masayasu
• Torii Shigehiro
• Sasaki Kunihiko
• Shimada Shota
• Shukuin Hirokazu
• Canon Kk

Inventors

• Ochi Daisuke
• Nagao Yuki
• Koyama Atsushi
• Mizushima Masayasu
• Torii Shigehiro
• Sasaki Kunihiko
• Shimada Shota
• Shukuin Hirokazu

Classifications

• G02B7/10 Primary

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