Japan, Feb. 27 -- COSINA CO LTD has got intellectual property rights for 'LENS DEVICE.' Other related details are as follows:
Application Number: JP,2021-200364
Category (FI): G03B21/00@D,G02B15/20,G02B13/18,G02B13/16,G03B21/14@D
Stage: PROBLEM TO BE SOLVED: To reduce aberration related to field curvature, and reduce the entire lens device and further reduce costs without complicating a mechanism of the lens device.SOLUTION: A lens device comprises: a lens optical system 100 that has a first lens group G1 in which a first front lens group G1F and a first rear lens group G1R are arranged from an enlargement side E, and the first front lens group G1F includes an aspherical lens Ls having both aspherical lens surfaces, and which has negative refractive power, a fourth lens group G4 having positive refractive power, and a seventh lens group G7 having positive refractive power; and an optical adjustment system 200 that has a zooming adjustment unit Mcz that makes the first lens group G1 and the seventh lens group G7 stationary and moves a second lens group G2 to a sixth lens group G6 independently in a direction of an optical axis Dc, and a focusing adjustment unit Mcf that independently moves the first front lens group G1F and the first rear lens group G1R in the direction of the optical axis Dc.SELECTED DRAWING: Figure 1 (Grant)
Filing Date: Dec. 9, 2021
Publication Date: June 21, 2023
The original document can be viewed at: https://www.j-platpat.inpit.go.jp/p0100
Disclaimer: Curated by HT Syndication.
