Simultaneously grinding and polishing preforms for optical lenses
US4760672A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1986 |
| Grant date | Aug 2, 1988 |
| Priority date | — |
| Expiry date | Dec 10, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T409/305768
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
An optical surface on a glass preform for an optical lens is simultaneously ground and polished. A glass blank is rotated by a work spindle mounted in an air bearing. A resin bonded diamond cutting ring is rotated by a tool spindle mounted in an air bearing. The axis of the tool spindle is set at an angle with respect to the axis of the work spindle with the edge of the cutting ring being centered on the axis of rotation of the blank. One of the spindles is moved linearly with respect to the other to move the cutting ring into engagement with the blank for grinding a precisely shaped, polished optical surface thereon. The spindles are mounted on a table and a driving motor for the linear drive is remote from the table to isolate the spindles from the vibration of the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.