Zoom lens and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorMakoto Sekita
Life of this patent
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Abstract
The present invention provides a zoom lens suitable for an image pickup system using a solid-state image pickup element. In detail, the zoom lens disclosed in the present invention includes three lens units having negative, positive, and positive optical power in order from an object side to an image side, in which zooming is performed by moving each lens unit in the direction of an optical axis. The first lens unit has at least one positive lens and at least one negative lens. The second lens unit has at least one positive lens and at least one negative lens, in which a plastic lens of positive optical power is disposed on the side closest to the object.
Claims11
A zoom lens comprising,
- in order from an object side to an image side,
- a first lens unit having negative optical power, the first lens unit including at least one positive lens and at least one negative lens;
- a second lens unit having positive optical power, the second lens unit including at least one positive lens and at least one negative lens, the lens of the second lens unit disposed on the closest-to-object side being a plastic lens having positive optical power;
- and
- a third lens unit having positive optical power;
- wherein each lens unit moves in the direction of an optical axis for zooming.
Dependencies are inferred from the claim text.