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US 9,457,411 B2Granted
Collet
Assigneeasphericon GmbH
InventorSven Kiontke
Life of this patent
Estimating the term…
Abstract
A collet for holding a lens includes a shank and at least two gripping jaws separated from one another by radial slots, wherein a shape of an upper edge region of the gripping jaws is designed as a radial continuation of a region to be processed of the lens that is to be held by the collet.
Claims17
Collet for holding a lens, comprising:
- a shank;
- at least two gripping jaws attached to an upper edge of the shank and separated from one another by radial slots, an upper edge region of the gripping jaws forming a contact surface for at least partially flexible grinding or polishing tool, the radial slots being continuous to an area adjacent to a lower edge of the shank;
- and
- a through hole formed between the upper edge of the gripping jaws and the lower edge of the shank,
- wherein the upper edge region of the gripping jaws is radially continuous with a region of the lens that is to be held by the collet, such that the upper region of the gripping jaws does not interfere with operation paths of the at least partially flexible grinding or polishing tool,
- wherein the gripping jaws includes a lens receiving section for receiving the lens, the lens receiving section having a sidewall portion that contacts a sidewall of the lens and a bottom outer edge that contacts a bottom outer edge of the lens and that is formed substantially perpendicularly to the sidewall portion,
- wherein a distance from the bottom outer edge to the upper edge region of the gripping jaws corresponds to a thickness of the lens at its edge, or is less than the thickness of the lens by an amount that corresponds to a material removal during the grinding and/or polishing that follows chucking in the collet, or corresponds to the material removal during the grinding and/or polishing that follows chucking in the collet and an additional center thickness tolerance, and
- wherein when the lens is held by the gripping jaws within the lens receiving section, the collet contacts the lens only at the sidewall portion and the bottom outer edge of the lens receiving section,
- wherein the shank is in a cylindrical form and has a cylindrical side surface having a first outer diameter, and
- wherein the gripping jaws includes an outer cylindrical wall portion having a second outer diameter that is greater than the first diameter, a tapered outer wall portion between the cylindrical wall portion and the upper edge region, and a lower outer surface that perpendicularly and radially inwardly extends from the cylindrical wall portion towards an axial direction of the collet and is connected to the cylindrical side surface of the shank at a transition region between the shank and the gripping jaws.
7 more elements
Collet for holding a lens, comprising:
- a shank;
- and
- at least two gripping jaws attached to an upper edge of the shank and separated from one another by radial slots, an upper edge region of the gripping jaws forming a contact surface for an at least partially flexible grinding or polishing tool, the radial slots being continuous to an area adjacent to a lower edge of the shank,
- wherein the upper edge region of the gripping jaws is radially continuous with a region of the lens that is to be held by the collet, such that the upper region of the gripping jaws does not interfere with operation paths of the at least partially flexible grinding or polishing tool,
- wherein a lens support with a cylindrical bearing surface with a rounded end forming a hollow space therein is formed inside an area surrounded by the gripping jaws and is centered in a lens receiving section for receiving the lens, the hollow space of the lens support extending between the rounded end and the lower edge of the shank, and
- wherein when the lens is held by the gripping jaws, the collet contacts the lens only at a sidewall portion of the lens receiving section and the rounded end of the cylindrical bearing surface,
- wherein the shank is in a cylindrical form and has a cylindrical side surface having a first outer diameter, and
- wherein the gripping jaws includes an outer cylindrical wall portion having a second outer diameter that is greater than the first diameter, a tapered outer wall portion between the cylindrical wall portion and the upper edge region, and a lower outer surface that perpendicularly and radially inwardly extends from the cylindrical wall portion towards an axial direction of the collet and is connected to the cylindrical side surface of the shank at a transition region between the shank and the gripping jaws.
5 more elements
Dependencies are inferred from the claim text.