Lens with a fixed focal length and a constant structural length for autofocus applications
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United States of America Patent
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Dec 7, 2021
Grant Date -
Jul 4, 2019
app pub date -
Sep 18, 2017
filing date -
Sep 18, 2016
priority date (Note) -
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Abstract
A lens with a fixed focal length comprising including a first front lens-element group, a second lens-element group, a third lens-element group, a fourth lens-element group, and a fifth back lens-element group. Relative to an imaging plane in a lens barrel and both the focusing front group and the focusing back group are movable jointly relative to one another and to the lens-element groups arranged in a stationary manner in order to focus the lens on objects at different object distances. The front lens-element group has a positive refractive power and the central group and the back lens-element group have a negative refractive power.
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