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US 8,027,098 B2Granted
Focus lens apparatus
AssigneeCanon Kabushiki Kaisha
InventorMasayuki Sakamoto
Life of this patent
Estimating the term…
Abstract
Provided is a zoom lens including: a focus lens unit which moves during focusing; and a magnification-varying lens unit which moves during zooming, in which when the magnification-varying lens unit is moved in a direction in which a depth of focus deepens, a focus operation using the focus lens unit is stopped.
Claims12
A zoom lens, comprising:
- a focus lens unit which moves during focusing;
- a magnification-varying lens unit which moves during zooming;
- a focus state detection unit for detecting a focus state in the zoom lens;
- and
- a focus drive unit for driving the focus lens unit based on a result of detection obtained by the focus state detection unit,
- wherein the focus drive unit drives the focus lens unit based on the result of detection obtained by the focus state detection unit when the magnification-varying lens unit is moved in a direction in which the depth of focus shallows, and the focus drive unit does not drive the focus lens unit when the magnification-varying lens unit is moved in the direction in which the depth of focus deepens.
3 more elements
A camera, comprising:
- an image pickup element;
- and
- a zoom lens for guiding a beam from a subject to the image pickup element,
- wherein the zoom lens includes:
- a focus lens unit which moves during focusing;
- a magnification-varying lens unit which moves during zooming,
- a focus state detection unit for detecting a focus state in the zoom lens;
- and
- a focus drive unit for driving the focus lens unit based on a result of detection obtained by the focus state detection unit,
- wherein the focus drive unit drives the focus lens unit based on the result of detection obtained by the focus state detection unit when the magnification-varying lens unit is moved in a direction in which the depth of focus shallows, and the focus drive unit does not drive the focus lens unit when the magnification-varying lens unit is moved in the direction in which the depth of focus deepens.
7 more elements
A zoom lens having an autofocus function,
- wherein when the zoom lens is zoomed in a direction in which a depth of focus shallows, the autofocus function is set to be valid, and
- wherein when the zoom lens is zoomed in a direction in which the depth of focus deepens, the autofocus function is set to be invalid, and
- wherein the zoom lens includes:
- a focus lens unit which moves during focusing;
- a magnification-varying lens unit which moves during zooming;
- a focus state detection unit for detecting a focus state in the zoom lens;
- and
- a focus drive unit for driving the focus lens unit based on a result of detection obtained by the focus state detection unit,
- wherein the focus drive unit drives the focus lens unit based on the result of detection obtained by the focus state detection unit when the magnification-varying lens unit is moved in a direction in which the depth of focus shallows, and the focus drive unit does not drive the focus lens unit when the magnification-varying lens unit is moved in the direction in which the depth of focus deepens.
6 more elements
A camera having an autofocus function, comprising:
- an image pickup element;
- and
- a zoom lens for guiding a beam from a subject to the image pickup element,
- wherein when the zoom lens is zoomed in a direction in which a depth of focus shallows, the autofocus function is set to be valid, and
- wherein when the zoom lens is zoomed in a direction in which the depth of focus deepens, the autofocus function is set to be invalid, and
- wherein the zoom lens includes:
- a focus lens unit which moves during focusing;
- a magnification-varying lens unit which moves during zooming;
- a focus state detection unit for detecting a focus state in the zoom lens;
- and
- a focus drive unit for driving the focus lens unit based on a result of detection obtained by the focus state detection unit,
- wherein the focus drive unit drives the focus lens unit based on the result of detection obtained by the focus state detection unit when the magnification-varying lens unit is moved in a direction in which the depth of focus shallows, and the focus drive unit does not drive the focus lens unit when the magnification-varying lens unit is moved in the direction in which the depth of focus deepens.
9 more elements
A zoom lens comprising:
- a focus lens unit which moves during focusing;
- a magnification-varying lens unit which moves during zooming;
- a focus state detection unit for detecting a focus state in the zoom lens;
- a focus drive unit for driving the focus lens unit based on a result of detection obtained by the focus state detection unit;
- a magnification-varying lens drive unit for driving the magnification-varying lens unit;
- and
- a control unit for controlling the focus drive unit and the magnification-varying lens drive unit,
- wherein the focus drive unit drives the focus lens unit based on a focus command signal generated by the control unit based on the result of detection obtained by the focus state detection unit when the magnification-varying lens unit is moved in a direction in which the depth of focus shallows, and the focus drive unit does not drive the focus lens unit when the magnification-varying lens unit is moved in the direction in which the depth of focus deepens, and
- wherein whether the magnification-varying lens unit is moved in the direction in which the depth of focus shallows or the direction in which the depth of focus deepens is determined based on a zooming command signal transmitted from the control unit to the magnification-varying lens drive unit.
6 more elements
A zoom lens comprising:
- a focus lens unit which moves during focusing;
- a magnification-varying lens unit which moves during zooming;
- a magnigication-varying lens drive unit for driving the magnification-varying lens unit;
- a focus state detection unit for detecting a focus state in the zoom lens;
- a focus drive unit for driving the focus lens unit based on a result of detection obtained by the focus state detection unit;
- a zoom position detection unit for detecting a position of the magnification-varying lens unit;
- and
- a control unit for controlling the focus drive unit and the magnification-varying lens drive unit,
- wherein the focus drive unit drives the focus lens unit based on a focus command signal generated by the control unit based on the result of detection obtained by the focus state detection unit when the magnification-varying lens unit is moved in a direction in which the depth of focus shallows, and the focus drive unit does not drive the focus lens unit when the magnification-varying lens unit is moved in the direction in which the depth of focus deepens, and
- wherein whether the magnification-varying lens unit is moved in the direction in which the depth of focus shallows or the direction in which the depth of focus deepens is determined based on a result of detection obtained by the zoom position detection unit from the control unit.
7 more elements
Dependencies are inferred from the claim text.