Loading patent…
AssigneeHoya Corporation
InventorsMasahiro Jinbo, Takashi Daimaru
Estimating the term…
When a forming a bevel on a lens, the value of the bevel curve is calculated based on the value of the curve of the concave face, a reference axis of the bevel curve is determined to be in the same direction as the curvature of the concave face, a reference position on the peripheral edge of the lens in the first portion having the minimum thickness is determined based on the thickness of the first portion, a correction for the initial reference axis of the bevel curve is obtained, an angle of inclination from the direction of the initial reference axis of the bevel curve is obtained based on the correction and the locus of the bevel is determined based on the value of the bevel curve, the reference position and the angle of inclination.
An apparatus for processing a lens comprising:
An apparatus for processing a lens comprising:
An apparatus for processing a lens comprising:
An apparatus for processing a lens comprising:
An apparatus for processing a lens which comprises:
An apparatus for processing a lens comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Processes of grinding or polishing
Of optical work, e.g. lenses, prisms: electrically, e.g. numerically, controlled
For grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements: for grinding grooves in glass workpieces, e.g. decorative…
Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation: for bevelling optical work, e.g.…
Term ended 4 Apr 2023 (estimated)
The present invention relates to a method for determining a bevel curve, a method for determining a locus of a bevel, a method for processing a lens and an apparatus for processing a lens that is used for conducting these methods.
Previously in the art of processing lenses for eyeglass spectacles and the like, apparatuses for processing a lens have been used to process an uncut lens to fit the shape of a lens frame of a spectacle frame. Various prior art apparatuses for processing a lens are known; although certain lens processing apparatuses having the so-called “function of automatic beveled processing” have been provided. When a regular lens is used as the uncut lens and processed using this type of lens processing apparatus with the automatic beveled processing feature, specific additional information is required to process the lens besides the conventional data required. Specifically, data describing the shape of the frame is necessary in addition to the conventional information required for processing the uncut lens. When all of this information is provided to the apparatus having the automatic beveled processing feature, the apparatus automatically calculates a locus of a bevel most suitable for the lens undergoing processing and the bevel is formed along this calculated locus.
On the other hand, when the uncut lens is a special lens, such as a high power minus lens, a high power plus lens, an EX lens or a lenticular lens, the prior art lens processing apparatuses having the automatic beveled processing feature have certain drawbacks. Specifically, when processing a special lens using a prior art apparatus, the position of the apex of the bevel and the bevel curve, or the bevel ratio, must be manually set by an operator who watches a computerized simulation display. Therefore, adjustment of the position of the apex of the bevel and the bevel curve, or the bevel ratio, must be performed intentionally by the operator.
FIG. 1 is a block diagram schematically exhibiting the functioning portions of the apparatus for processing a lens in accordance with an apparatus embodiment of the present invention.
FIG. 2 is a perspective diagram schematically exhibiting the construction of the interior of the apparatus for processing a lens in accordance with an apparatus embodiment of the present invention.
FIG. 3 is a diagram exhibiting the construction around the lens-measuring portion of the apparatus for processing a lens in accordance with an apparatus embodiment of the present invention.
The present invention includes both apparatus and method embodiments for processing a special lens, such as a high power plus lens, a high power minus lens, a lenticular lens and an EX lens, wherein the apparatus and method include an automatic beveled lens processing feature. The various apparatus and method embodiments are described below in detail with reference to the figures, wherein like character references indicate like parts or features.
FIG. 1 is a block diagram schematically exhibiting the functional portions of the apparatus for processing a lens as an apparatus embodiment of the present invention. The apparatus 1 for processing a lens comprises a lens-processing portion 2 in which an uncut lens is processed so as to provide a processed lens having a shape fitting the lens frame of the spectacle frame (not shown). The apparatus 1 also includes an operation panel 3, a control portion 4 and a memory portion 5.
The lens-processing portion 2 comprises a lens-holding unit 21, a lens-measuring portion 22, a rough processing portion 23, a beveled and flat grinding portion 24, a polishing portion 25, a grooving portion 26 and a chamfering portion 27.