Search International and National Patent Collections

1. (WO2017150486) OPTICAL SYSTEM, IMAGING DEVICE PROVIDED WITH SAME, AND PROJECTION DEVICE

Pub. No.:    WO/2017/150486    International Application No.:    PCT/JP2017/007616
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Wed Mar 01 00:59:59 CET 2017
IPC: G02B 17/08
B62D 1/04
G02B 13/18
H04N 5/74
Applicants: CANON KABUSHIKI KAISHA
キヤノン株式会社
Inventors: NAKANO Masatsugu
中野 正嗣
Title: OPTICAL SYSTEM, IMAGING DEVICE PROVIDED WITH SAME, AND PROJECTION DEVICE
Abstract:
An optical system 100 provided with a first group G1, an opening aperture STO, and a second group G2 in the stated order from the magnification side, wherein: the first group G1 includes a refraction surface 11 that is convex toward the magnification side; the second group G2 includes a transmissive reflection surface 31 and a concave reflection surface 32; light from the magnification side that has been transmitted through the opening aperture STO is transmitted through the transmissive reflection surface 31 and then is reflected by the reflection surface 32 and the transmissive reflection surface 31 in the stated order; and the condition of 0.7 ≤ |Rl|/Ll ≤ 1.5 is satisfied, where Rl is the radius of curvature of the refraction surface 11 (mm) and Ll is the distance between the refraction surface 11 and the opening aperture STO (mm).