公开(公告)号：EP3208644A4

公开(公告)日：2018-06-13

申请号：EP15850169

申请日：2015-08-27

Applicant: NITTOH INC

Inventor： HANAOKA TAKAFUMI ,  MATSUO TAKAHIKO ,  FUJIMATSU TAKUYA

IPC: G02B7/02 ,  G02B13/24 ,  G03B21/14

CPC classification number: G02B7/028 ,  G02B7/04 ,  G02B13/16 ,  G02B27/0025 ,  G03B21/14 ,  G03B21/142

Abstract: In order to provide a projection lens barrel and a projection display device that are capable of correcting the optical characteristics of a plurality of lens groups, a projection lens barrel 100, comprising a lens optical system 2 causing light from an image display element to be formed as a projected image on a screen, also comprises correction mechanisms 39, 40 that move each of at least two lens groups 5, 8 along an optical axis X and correct the optical characteristics to be corrected, said lens groups each having different optical characteristics for correction in order to suppress reduction in image quality of a projected image caused by changes in optical characteristics caused by temperature changes in the projection lens barrel 100.

公开(公告)号：EP3214476A4

公开(公告)日：2018-05-30

申请号：EP15855306

申请日：2015-10-30

Applicant: NITTOH INC

Inventor： MATSUO TAKAHIKO

IPC: G02B17/08 ,  G02B13/16 ,  G02B13/18 ,  G03B21/00 ,  G03B21/14 ,  G03B21/28

CPC classification number: H04N9/315 ,  G02B13/16 ,  G02B15/20 ,  G02B17/08 ,  G02B17/0852 ,  G03B21/00 ,  G03B21/14 ,  G03B21/147 ,  G03B21/28 ,  H04N9/3141

Abstract: A projection optical system (10) is an optical system that projects from a first image plane (5) on a reducing side to a second image plane (6) on an enlargement side. The projection optical system (10) includes a first optical system (11) that includes a plurality of lenses and forms a first intermediate image (51) formed inside the first optical system (11) by light incident from the reducing side into a second intermediate image (52) on the enlargement side of the first optical system (11); a second optical system (12) that includes a first reflective surface (M1) with positive refractive power which is positioned further to the enlargement side than the second intermediate image (52); and a glass block (30) that is disposed between the first optical system (11) and the first reflective surface (M1), the glass block (30) passing light rays from the first optical system (11) to the second intermediate image (52).