NDLI: A theoretical and experimental investigation of design and slow tool servo machining of freeform progressive addition lenses (PALs) for optometric applications

Content Provider	Springer Nature Link
Author	Kong, LingBao Cheung, ChiFai To, Suet Wang, Bo Ho, LaiTing
Copyright Year	2013
Abstract	Different from the traditional single or bifocal lens, freeform progressive addition lens (PAL) comprises of a far view zone, a near zone and a progressive zone between the far and near zones. Freeform PAL provides a good solution to correct presbyopia and other disorders of accommodation, which is more widely adopted in the present optometric applications. However, there is still a lack of a standard procedure for the design of a PAL. Besides, the traditional manufacturing of freeform PAL is usually done by the approaches of grinding and polishing one by one, which is not only expensive but also time-consuming. This paper presents the research of a new approach for design and manufacturing technology for freeform PAL by ultra-precision machining approach. Extended polynomial is employed for the representation of freeform surface, which is used for the optimization of optical performance by some commercial optical software such as Zemax. Ultra-precision machining technology based on single-point diamond turning with slow slide servo (3S) machining is used to produce the mould inserts for precision moulding of the freeform PAL. Machining mechanics of 3S is discussed. A freeform PAL with an aspherical surface as front side and a freeform surface as back side has been designed. The precision mould insert of the designed freeform PAL was produced by ultra-precision machining process, and a plastic freeform PAL made of polycarbonate was also produced by precision moulding. Preliminary results obtained show that the new approach for design and fabrication is helpful to advance the design procedure optimization and mass production of PAL in optometry.
Starting Page	33
Ending Page	40
Page Count	8
File Format	PDF
ISSN	02683768
Journal	The International Journal of Advanced Manufacturing Technology
Volume Number	72
Issue Number	1-4
e-ISSN	14333015
Language	English
Publisher	Springer London
Publisher Date	2013-08-11
Publisher Place	London
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Progressive addition lens Freeform surfaces Extended polynomials Ultra-precision machining Slow slide servo Optometry Industrial and Production Engineering Production/Logistics/Supply Chain Mechanical Engineering Computer-Aided Engineering (CAD, CAE) and Design
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Control and Systems Engineering Mechanical Engineering Computer Science Applications Software

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