Patent ID: 8094354
Filing Date: 2012-01-10
Classification: G02B

Abstract:
1. A scanning objective lens for scanning on an observation target with light emitted from an exit end face of an optical fiber moving on a curved plane formed to be convex on an objective lens side, comprising: a first lens group having a positive power; and a second lens group having a positive power, the first lens group and the second lens group being arranged in this order from the optical fiber's exit end face side, the scanning objective lens satisfying conditions: when f1 (unit: mm) denotes a focal length of the first lens group, f2 (unit: mm) denotes a focal length of the second lens group, R1a (unit: mm) denotes a curvature radius of a lens surface of lens surfaces in the first lens group nearest to the exit end face of the optical fiber, R1b (unit: mm) denotes a curvature radius of a lens surface of the lens surfaces in the first lens group nearest to the observation target, wherein a lens surface of lens surfaces in the second lens group nearest to the observation target is a concave surface, and where R2b (unit: mm) denotes a curvature radius of the concave surface, and f (unit: mm) denotes a total focal length of the scanning objective lens.