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US 7,003,222 B1Granted
Camera, lens apparatus, and camera system
AssigneeCanon Kabushiki Kaisha
InventorJunichi Murakami
Life of this patent
Estimating the term…
Abstract
A camera which maintains accuracy of stop position in accordance with the state of an image-taking optical system and allows driving of a focus lens to a target position in a short time period, is disclosed. The camera comprises a motor which drives the focusing lens, and a controller which controls the motor such that the focusing lens is stopped at the target position by performing deceleration control in accordance with a predetermined deceleration control pattern. The controller changes the deceleration control pattern in accordance with the state of the image-taking optical system detected by the state detector.
Claims23
A camera comprising:
- an image-taking optical system which includes a focusing lens and a zooming lens;
- a motor which drives the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control in accordance with a predetermined deceleration control pattern;
- and
- a state detector which detects one of a focal length and a set value of the stop of the image-taking optical system,
- wherein the controller changes the deceleration control pattern in accordance with one of the focal length and the set value of the stop detected by the state detector;
- and
- the controller sets the deceleration control pattern in which, when the focal length of the image-taking optical system is on a wide-angle side closer to a wide-angle end than a predetermined focal length, the motor is decelerated for stopping at a deceleration rate larger than a deceleration rate when the focal length is on a telephoto side, after a remaining driving amount becomes less than a predetermined amount.
5 more elements
A camera comprising:
- an image-taking optical system which includes a focusing lens and a zooming lens;
- a motor which drives the focusing lens;
- a position detector which detects a position of the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at at a target position by performing deceleration control from the time when a difference between the target position and the position detected by the position detector is equal to or smaller than a predetermined amount;
- and
- a state detector which detects a focal length of the image-taking optical system,
- wherein the controller changes the predetermined amount in accordance with the focal length detected by the state detector.
4 more elements
A lens apparatus comprising:
- an image-taking optical system which includes a focusing lens and a zoomimg lens;
- a motor which drives the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control in accordance with a predetermined deceleration control pattern;
- and
- a state detector which detects one of a focal length of the image-taking optical system,
- wherein the controller changes the deceleration control pattern in accordance with the focal length detected by the state detector, and
- the controller sets the deceleration control pattern in which, when the focal length of the image-taking optical system is on a wide-angle side closer to a wide angle end than a predetermined focal length, the motor is decelerated for stopping at a deceleration rate larger than a deceleration rate when the focal length is on a telephoto side, after a remaining driving amount becomes equal to or less than a predermined amount.
4 more elements
A lens apparatus comprising:
- an image-taking optical system which includes a focusing lens and a zooming lens;
- a motor which drives the focusing lens;
- a position detector which detects a position of the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control from time when a difference between the target position and the position detected by the position detector is equal to or smaller than a predetermined amount;
- and
- a state detector which detects a focal length of the image-taking optical system,
- wherein the controller changes the predetermined amount in accordance with the focal length by the state detector.
4 more elements
A camera comprising:
- an image-taking optical system which includes a focusing lens and a diaphragm;
- a motor which drives the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control in accordance with a deceleration pattern selected from a plurality of deceleration patterns which includes different deceleration rate;
- and
- a state detector which detects a state of the diaphragm of the image taking optical system,
- wherein the controller select the deceleration pattern based on the state of the diaphragm detected by the state detector.
3 more elements
A camera comprising:
- an image-taking optional system which includes a focusing lens and an aperture diaphragm;
- a motor which drives the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control in accordance with a predermined deceleration control pattern;
- and
- a state detector which detects an aperture value of the image-taking optical system,
- wherein the controller changes the deceleration control pattern in accordance with aperture value detected by the state detector;
- and
- the controller sets the deceleration control pattern in which, when the aperture value of the image-taking optical system is on a narrowed said relative to a predetermined aperture value, the motor is decelerated for stopping at a decelerated rate larger than a deceleration rate when the aperture value is on an opened side, after a remaining driving amount becomes equal to or less than a predetermined amount.
5 more elements
A camera comprising:
- an image-taking optical system which includes a focusing lens and an aperture diaphragm;
- a motor which drives the focusing lens;
- a position detector which detects a position of the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control from the time when a difference between the target position and the position detected by the position detector is equal to or smaller than a predermined amount;
- and
- a state detector which detects an aperture value of the image-taking optical system,
- wherein the controller changes the predermined amount in accordance with the aperture value detected by the state detector, when the aperture value of the image-taking optical system is on a narrowed side relative to a predetermined aperture value.
4 more elements
A lens apparatus comprising:
- an image-taking optical system which include a focusing lens and an aperture diaphragm;
- a motor which drives the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control in accordance with a predetermined deceleration control pattern;
- and
- a state detector which detects an aperture value of the image-taking optical system,
- wherein the controller changes the deceleration control pattern in accordance with the aperture value detected by the detector.
3 more elements
A camera comprising:
- an image-taking optical system which includes a focusing lens and an aperture diaphragm;
- a motor which drives the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control in accordance with a predetermined deceleration control pattern;
- and
- a state detector which detects an aperture value of the image-taking optical system,
- wherein the controller changes the deceleration control pattern in accordance with the aperture value detected by the state detector.
3 more elements
A camera comprising:
- an image-taking optical system which includes a focusing lens and an aperture diaphragm;
- a motor which drives the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control in accordance with a predetermined deceleration control pattern;
- and
- a state detector which detects a focal length of the image-taking optical system,
- wherein the controller changes the deceleration control pattern in accordance with the focal length detected by the state detector, and
- the controller sets the deceleration control pattern in which, when the focal length of the image-taking optical system is on a wide angle side closer to a wide-angle end than a predetermined focal length, the motor is decelerated for stopping at a deceleration rate larger than a deceleration rate when the focal length is on a telephoto side, after a remaining driving amount becomes equal to or less than a predetermined amount.
4 more elements
A lens apparatus comprising:
- an image-taking optical systems which includes a focusing lens and an aperture diaphragm;
- a motor which drives the focusing lens;
- a position detector which detects a position of the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control from the time when a difference between the target position and the position detected by the position detector is equal to or smaller than a predetermined amount;
- and
- a state detector which detects an aperture value of the image-taking optical system,
- wherein the controller changes the predetermined amount in accordance with the aperture value detected by the state detector, when the aperture value of the image-taking optical system is on a narrowed side relative to a predetermined aperture value.
4 more elements
A lens apparatus comprising:
- an image-taking optical system which includes a focusing lens a diaphragm;
- a motor which drives the focusing lens;
- a controller which controls the motor such that the focusing lens is stopped at a target position by performing deceleration control in accordance with a deceleration pattern selected from a plurality of deceleration patterns which includes different deceleration rate;
- and
- a state detector which detects a state of the diaphragm of the image-taking optical system,
- wherein the controller selects the deceleration pattern based on the state of the diaphragm detected by the state detector.
3 more elements
Dependencies are inferred from the claim text.