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EP0306409A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Optical system for the determination of the variation of the curvature of an object within a zone of small dimensions

Assignee: Summit Technology Inc
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Filing: 1988-09-01
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Granted: —
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Expires: 2008-09-01
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Abstract

Abstract Translated from French Selon l'invention, il comprend : - une source lumineuse (1) ; - une première optique (3) destinée à former un faisceau lumineux parallèle (2b) à partir du faisceau (2a) ; - un élément semi-réfléchissant (4) disposé sur le trajet dudit faisceau parallèle (2b) , - une deuxième optique de focalisation (7) recevant le faisceau parallèle (2c) réfléchi par ledit élément (4) et étant susceptible de se déplacer, parallèlement à la direction de propagation dudit faisceau lumineux (2c), de façon que son foyer image (8) coïncide avec le centre de courbure (C) ou la surface dudit objet (9) ; - une troisième optique de focalisation (10) recevant le faisceau (2d) réfléchi par l'objet (9) et provenant dudit élément (4), et - des moyens de détection (11) de l'image (12) formée par ledit système. Application en kératométrie. According to the invention, it comprises: - a light source (1); - a first lens (3) intended to form a parallel light beam (2b) from the beam (2a); - a semi-reflecting element (4) disposed on the path of said parallel beam (2b), - a second focusing optic (7) receiving the parallel beam (2c) reflected by said element (4) and being capable of moving, parallel to the direction of propagation of said light beam (2c), so that its image focus (8) coincides with the center of curvature (C) or the surface of said object (9); - a third focusing optic (10) receiving the beam (2d) reflected by the object (9) and coming from said element (4), and - detection means (11) of the image (12) formed by said system. Application in keratometry.

Inventors

  • 👤 Alain Azema
  • 👤 Gérard Moulin
  • 👤 Jean Botineau

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 12:45
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/24; G01B11/255; A; A61; A61B; A61B3/00; A61B3/10; A61B3/107; A61F; A61F9/00; A61F9/007; A61F9/008; A61F9/00802; A61F2009/00861; A61F2009/00872

Claims Analysis

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References Cited (Backward Citations)

GB1209451A Cited
US4209252A Cited
WO1986002249A1 Cited

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