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Apparatus for pressure based blocking process for lens manufacturing

Inactive Publication Date: 2005-04-07
RADTEK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] According to another aspect, the invention provides a button holder for holding a button intact without any risk of potential damage to the button.
[0017] According to another aspect, the invention provides a button holder that may flexibly float on a seat stage of a blocking apparatus, where the button holder may include a mechanism to self-align on the seat stage after a block interfaces with the button holder.
[0018] According to another aspect, the invention provides a blocking apparatus and a blocking method for automatically compensating variations in a button geometry without requiring complex adjustments during blocking process of lens manufacturing.

Problems solved by technology

Contact lens manufacturing involves multiple complex operations.
This process presents problems if the thickness or geometry of the button varies.
If the button is too thick, the block may deform the button.
If the button is too thin, the block may not achieve sufficient “contact” to achieve proper adherence.
These adjustments are time consuming and require a skilled operator.
Furthermore, conventional systems typically dip the block in the fixing material or dispense the fixing material through a nozzle.
One problem with these methods is a non-uniform adherence of the wax on the block.
In addition, wax left in the nozzle cools, causing it to solidify, particularly at the tip, thereby hampering further wax from being dispensed.

Method used

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  • Apparatus for pressure based blocking process for lens manufacturing
  • Apparatus for pressure based blocking process for lens manufacturing
  • Apparatus for pressure based blocking process for lens manufacturing

Examples

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Embodiment Construction

[0039] According to an embodiment of the invention illustrated in FIG. 1, a blocking apparatus 100 of the invention may include, for example, a block 102 (e.g., a fixture, an arbor, etc.), a block head 106, a button 104 (e.g., unprocessed contact lens), a seat 108, a seat stage 110, a base 112, a force control mechanism 114, and a force adjustment mechanism 116. Block 102 may be coupled to block head 106. Block 102 and block head 106 may be movable in an axis vertical to blocking apparatus 100. While block 102 and block head 106 are described herein as operating in a vertical axis, the invention may also be constructed to operate block 102 and block head 106 in a horizontal or any other axis as would be apparent.

[0040] According to an aspect of the invention, button 104 is placed on seat 108. Seat 108 may be positioned on and attached to seat stage 110. In some embodiments, seat 108 may be movable in one or more axes relative to seat stage 110.

[0041] According to an aspect of the ...

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Abstract

According to one aspect, the invention provides a blocking apparatus and a blocking method for precisely aligning a button holder against a block during blocking process of lens manufacturing. According to another aspect, the invention provides a blocking apparatus and a blocking method for automatically compensating variations in a button geometry without requiring complex adjustments during blocking process of lens manufacturing. According to yet another aspect, the invention provides a blocking apparatus and a blocking method for positioning a block on a button based on a predetermined pressure applied on the block in order to compensate variations in the button geometry.

Description

RELATED APPLICATIONS [0001] This application is related to co-pending patent applications titled “An Apparatus for Precision Alignment During Blocking Process of Lens Manufacturing,” Attorney Docket No. 24116-500, “A Blocking Apparatus for Lens Manufacturing Including Automatic Wax Delivery System,” Attorney Docket No. 24116-501, and “Blocking Apparatus Providing an Adjustable Offset for Precision Alignment,” Attorney Docket No. 24116-503, each of which was filed herewith on Oct. 2, 2003, and incorporated herein by reference.FIELD OF THE INVENTION [0002] This invention relates generally to an apparatus for blocking process for lens manufacturing, and more particularly to an apparatus for pressure based blocking process for lens manufacturing. BACKGROUND OF THE INVENTION [0003] Contact lens manufacturing involves multiple complex operations. Each of these operations requires a high degree of accuracy in order to achieve a precise fabrication for the contact lens. [0004] An unprocesse...

Claims

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Application Information

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IPC IPC(8): B24B13/005B24B49/16
CPCB24B49/16B24B13/005
Inventor BERGANDY, KONRADBERGANDY, WIESLAW
Owner RADTEK CORP
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