Surface Cleaning of Glass Lenses

Case Study  |  Removal of surface coatings on glass lenses

Company: Hoya | Region: UK | Sector: [Glass Lenses] Optical | Date Published: June 2014

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Plasma Cleaning for Quality Assurance

Hoya Lens has had a presence in the UK for over 30 years in which time they have brought some of the best quality lens materials to the UK optical market.

Hoya creates the very latest lens designs and applies them to the thinnest and most durable lens materials. They are then able to enhance visual comfort even further with the addition of anti-reflection coatings, scratch-resistant coatings and easy to clean treatments.

Hoya’s production plant in Wrexham, North Wales approached Henniker when they recognised a need to improve existing stringent quality testing procedures of their glass lenses.


Aims and Objectives

Almost all of the lens coatings manufactured at Hoya are hydrophobic. These coatings need to be removed during quality testing. One method involves using a polishing compound to manually remove the coating, which is both labour intensive and can suffer from inconsistencies. Hoya’s technical team identified a need for an alternative process to reduce these inconsistencies and approached Henniker regarding plasma cleaning techniques as a possible alternative.

Neil Jowitt from Hoya explains:

‘The unit we wanted was small, quick and easy to use and the solution identified by Henniker fit the brief perfectly.’



The main challenge was to identify suitable plasma cleaner parameters for the delicate lens materials which could deliver repeatable and reliable results. Henniker worked with Hoya to achieve this goal before delivering a cost effective bench-top solution having a simple operator interface.



A glass lens prior to plasma treatment displaying its inherent hydrophobic properties           A glass lens after being plasma cleaned displaying hydrophilic characteristics

          Before Plasma Treatment                                       After Plasma Treatment

“We find ourselves now having better results with regards to consistency. There is less time spent cleaning the lenses manually with less residue left to contaminate other processes.”

Neil Jowitt/Hoya

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