公开(公告)号：DE69318656T2

公开(公告)日：1999-10-07

申请号：DE69318656

申请日：1993-03-05

Applicant: LEICA INC

Inventor： PERCIVAL CHRISTOPHER ,  LUCE DAVID

IPC: G01M11/02

Abstract: Optical properties of a lens, including localized defects, are determined by analyzing the refracted image produced by transmitting a beam of light through an aperture and a lens to be tested. The image is reflected onto a light sensitive detecting surface. Information obtained from the light detecting surface is digitized and sent to an Image Processing Unit which calculates the optical properties of the lens. The aperture may consist of a single shaped opening or alternatively a plurality of concentric, annular rings. Correction lenses may be employed, either permanently or selectively, to alter the refracted beam before the beam intersects the detecting surface.

公开(公告)号：DE69318656D1

公开(公告)日：1998-06-25

申请号：DE69318656

申请日：1993-03-05

Applicant: LEICA INC

Inventor： PERCIVAL CHRISTOPHER ,  LUCE DAVID

IPC: G01M11/02

Abstract: Optical properties of a lens, including localized defects, are determined by analyzing the refracted image produced by transmitting a beam of light through an aperture and a lens to be tested. The image is reflected onto a light sensitive detecting surface. Information obtained from the light detecting surface is digitized and sent to an Image Processing Unit which calculates the optical properties of the lens. The aperture may consist of a single shaped opening or alternatively a plurality of concentric, annular rings. Correction lenses may be employed, either permanently or selectively, to alter the refracted beam before the beam intersects the detecting surface.

公开(公告)号：DE69401121D1

公开(公告)日：1997-01-23

申请号：DE69401121

申请日：1994-06-13

Applicant: LEICA INC

Inventor： LUCE DAVID ,  GROLMAN BERNARD

IPC: A61B3/028 ,  A61B3/032 ,  A61B3/06 ,  A61B3/09 ,  A61B3/02

Abstract: A device for testing visual contrast sensitivity is disclosed whereby the contrast between a vectographically polarized test symbol and a reference background may be continuously varied by changing the direction of polarization of a polarization analyzer situated along the test axis. The invention is practiced by providing a chart projector or a conventional refractor with a rotatable analyzer.

公开(公告)号：DE69510872T2

公开(公告)日：2000-02-10

申请号：DE69510872

申请日：1995-01-30

Applicant: LEICA INC

Inventor： LUCE DAVID ,  PERCIVAL CHRISTOPHER

IPC: G01J1/04 ,  A61B3/15 ,  G01M11/00 ,  G01M11/02 ,  H01J40/14

Abstract: A polar or vector display provides an operator of an optical instrument with a symbolic instruction regarding the direction and amount of motion required to center an optical element on a chosen path.

公开(公告)号：DE69510872D1

公开(公告)日：1999-08-26

申请号：DE69510872

申请日：1995-01-30

Applicant: LEICA INC

Inventor： LUCE DAVID ,  PERCIVAL CHRISTOPHER

IPC: G01J1/04 ,  A61B3/15 ,  G01M11/00 ,  G01M11/02 ,  H01J40/14

Abstract: A polar or vector display provides an operator of an optical instrument with a symbolic instruction regarding the direction and amount of motion required to center an optical element on a chosen path.

公开(公告)号：DE69401121T2

公开(公告)日：1997-06-26

申请号：DE69401121

申请日：1994-06-13

Applicant: LEICA INC

Inventor： LUCE DAVID ,  GROLMAN BERNARD

IPC: A61B3/028 ,  A61B3/032 ,  A61B3/06 ,  A61B3/09 ,  A61B3/02

Abstract: A device for testing visual contrast sensitivity is disclosed whereby the contrast between a vectographically polarized test symbol and a reference background may be continuously varied by changing the direction of polarization of a polarization analyzer situated along the test axis. The invention is practiced by providing a chart projector or a conventional refractor with a rotatable analyzer.