Endoscope objective optical system
AssigneePENTAX Corporation
InventorMinoru Murayama
Life of this patent
Estimating the term…
Abstract
An endoscope objective optical system includes a negative first lens group, a positive second lens group, and an imaging device, in this order from the object. Zooming is performed by moving the positive second lens group in the optical axis direction, and the endoscope objective optical system satisfies the following condition: m2T<m2W<−1 (1) wherein m2T designates the lateral magnification of the second lens group at the long focal length extremity, and m2W designates the lateral magnification of the second lens group at the short focal length extremity.
Claims9
An endoscope objective optical system comprising a negative first lens group, a positive second lens group, and an imaging device, in this order from an object,
- wherein a focal length of the entire endoscope objective optical system is changed by moving said positive second lens group in the optical axis direction, and
- wherein said endoscope objective optical system satisfies the following condition:
- m2T<m2W<−1
- wherein
- m2T designates the lateral magnification of said second lens group at the long focal length extremity, and
- m2W designates the lateral magnification of said second lens group at the short focal length extremity.
Dependencies are inferred from the claim text.