Taking optical system for video shooting
AssigneeMinolta Co., Ltd.
InventorsTakashi Okada, Tetsuo Kohno, Hideki Nagata
Life of this patent
Estimating the term…
Abstract
A zoom lens system is provided with, from the object side, a first lens unit having a negative optical power, a second lens unit having a positive optical power, a third lens unit having a negative optical power, and a condenser lens unit having a positive optical power. In this zoom lens system, zooming is performed by varying the distances between the first, the second, the third lens unit, and the condenser lens unit. Additionally, this zoom lens system fulfills the condition below: -1.5<.phi.1/.phi.C<-0.4 where .phi.1 represents the optical power of the first lens unit, and .phi.C represents the optical power of the condenser lens unit.
Claims19
A zoom lens system comprising:
- a first lens unit having a negative optical power;
- a second lens unit having a positive optical power;
- a third lens unit having a negative optical power;
- and
- a condenser lens unit having a positive optical power,
- wherein the first, second, and third lens units constitute a main optical system,
- wherein a zooming operation is performed by varying distances between the first lens unit, the second lens unit, the third lens unit, and the condenser lens unit,
- wherein the following condition is fulfilled:
- -1.5<.phi.1/.phi.C<-0.4
- where
- .phi.1 represents an optical power of the first lens unit;
- and
- .phi.C represents an optical power of the condenser lens unit.
An optical system comprising:
- a zoom lens system for forming an image of an object on a solid-state imaging device, said zoom lens system comprising a first lens unit having a negative optical power, a second lens unit having a positive optical power, a third lens unit having a negative optical power, and a condenser lens unit having a positive optical power, and filters provided between the third lens unit and the solid-state imaging device and including an optical low-pass filter,
- wherein the first, second, and third lens units constitute a main optical system,
- wherein a zooming operation is performed by varying distances between the first lens unit, the second lens unit, the third lens unit, and the condenser lens unit,
- wherein the following condition is fulfilled:
- -1.5<.phi.1/.phi.C<-0.4
- where
- .phi.1 represents an optical power of the first lens unit;
- and
- .phi.C represents an optical power of the condenser lens unit.
An optical system comprising:
- a solid-state imaging device;
- a zoom lens system for forming an image of an object on the solid-state imaging device, said zoom lens system comprising:
- a first lens unit having a negative optical power;
- a second lens unit having a positive optical power;
- and
- a third lens unit having a negative optical power;
- a condenser lens unit having a positive optical power;
- and
- filters provided between the third lens unit and the solid-state imaging device and including an optical low-pass filter,
- wherein the first, second, and third lens units constitute a main optical system,
- wherein a zooming operation is performed by varying distances between the first lens unit, the second lens unit, the third lens unit, and the condenser lens unit,
- wherein the following condition is fulfilled:
- -1.5<.phi.1/.phi.C<-0.4
- where
- .phi.1 represents an optical power of the first lens unit;
- and
- .phi.C represents an optical power of the condenser lens unit.
Dependencies are inferred from the claim text.