Endoscope objective optical system
First Claim
1. 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:
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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.
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Accused Products
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.
106 Citations
9 Claims
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1. 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<
−
1wherein 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification