Automatic focusing device
First Claim
Patent Images
1. An automatic focus adjustment device comprising:
- an objective optical system;
focus detecting means for repeatedly detecting a focus state of said objective optical system by using light passing through said objective optical system;
optical means for changing the focal length of said objective optical system;
attachment detecting means for detecting whether or not said optical means has been inserted in the optical path of said objective optical system;
focusing means for performing focusing of a composite system having said optical system and said optical means;
a driving source motor for driving said focusing means; and
means for discriminating the attachment of said optical means on the basis of an output of said attachment detecting means, and for changing a motor speed of said driving source motor depending on a property of said optical means in accordance with the focus state detected by said focus detecting means for compensating for a change in the movement rate of the image plane caused by the attachment of said optical means.
0 Assignments
0 Petitions
Accused Products
Abstract
An automatic focusing device for performing focus detection through an objective optical system, and adjusting the focusing position of the objective optical system in accordance with the detection result, wherein the attachment or detachment of an optical element for changing the focal length of the objective optical system is detected, and the speed of the drive source is changed depending on the detection result.
36 Citations
10 Claims
-
1. An automatic focus adjustment device comprising:
-
an objective optical system; focus detecting means for repeatedly detecting a focus state of said objective optical system by using light passing through said objective optical system; optical means for changing the focal length of said objective optical system; attachment detecting means for detecting whether or not said optical means has been inserted in the optical path of said objective optical system; focusing means for performing focusing of a composite system having said optical system and said optical means; a driving source motor for driving said focusing means; and means for discriminating the attachment of said optical means on the basis of an output of said attachment detecting means, and for changing a motor speed of said driving source motor depending on a property of said optical means in accordance with the focus state detected by said focus detecting means for compensating for a change in the movement rate of the image plane caused by the attachment of said optical means. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
-
8. A camera system comprising:
-
a camera body; a photographic lens releasably attached to said camera body; focus detecting means provided in said camera body to repeatedly detect a focus state of said photographic lens; a conversion lens releasably attached in between said photographic lens and said camera body; detecting means for detecting the attachment of said conversion lens; focusing means for performing focusing of said photographic lens or a composite system of said photographic lens and said conversion lens; said photographic lens having a driving source motor for driving said focusing means; and means electrically connected to said detecting means and responsive to attachment of said conversion lens for changing a motor speed of said driving source motor in accordance with an optical value of said photographic lens for compensating for a change in the movement rate of the image plane caused by the attachment of said optical means. - View Dependent Claims (9, 10)
-
Specification