Apparatus and method for manufacturing or working optical elements and/or optical forming elements, and such element
AssigneeNederlandse Organistie voor toegepastnatuurwetenschappelijk Onderzoek TNO
InventorsHedser Van Brug, Hugo de Haan, Jacobus Korpershoek, Ian Saunders
Life of this patent
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Abstract
The invention relates to an apparatus for forming or working optical elements and/or optical forming elements (1) comprising a working apparatus (18) for forming surfaces of form parts by machining or an abrasive technique, wherein at least one measuring device (17) is provided for measuring changes in form and/or surface roughness of said surface when said surface is being worked and, on the basis thereof controlling said working apparatus (18).
Claims27
An apparatus for forming or working optical elements and/or optical forming elements, comprising a working apparatus for forming surfaces of form parts by machining or abrasive technique, while at least one measuring device is provided for measuring, when said surface is being worked, changes in form and/or surface roughness of said surface and on the basis thereof controlling said working apparatus.
A method for forming or working optical elements or optical forming elements, wherein an optical element is placed in or on a holder such that a surface to be worked lies substantially clear from the holder, whereupon, with the aid of a working apparatus designed for carrying out an abrasive method, said surface to be worked is worked such that at least locally, the thickness of the element decreases while simultaneously, the thickness of the element at least at the location of the momentaneously worked surface part is measured and the working apparatus is controlled on the basis of the measured thickness, at least reduction thereof as a result of the abrasive method.
An optical element or pre-form for such an element, provided with a first surface and an opposite, second curved surface, wherein on the second surface, locally, an elevation has been provided while in the first surface, approximately opposite said elevation, a recess and/or protuberance has been provided.
A mold for an optical element, in particular for a contact lens, wherein at least one surface is substantially spherically curved and is provided with a circular recess, which recess has been provided with the aid of an abrasive method, in particular with fluid jet polishing.
A mold for an optical element, in particular for a contact lens, wherein at least one surface is substantially spherically curved and is provided with a circular recess, which recess has been provided with the aid of an abrasive method, in particular with fluid jet polishing, while at least two surface deformations are provided in which positioning elements can be formed such that during use a lens formed in the mold is secured against rotation on the eye by said positioning elements.
Dependencies are inferred from the claim text.