A surface imperfection not visible to the naked eye can become a glaring defect when magnified in the end product. A particle of glass, a finger print, a water spot may go unnoticed until enhanced by the application of optical films. As technologies continue to advance, as devices become smaller, more powerful, brighter and clearer, it is essential that your glass requirements are understood and met.
To help define your needs, following is an overview of general cosmetic specifications, inspection methods and Coresix capabilities. Coresix can work to known cosmetic specifications or help the customer to determine the appropriate specifications for a given application.
A scratch and dig specification can be written and inspection standard developed around any known requirements. The sample specifications listed above are intended to provide a general guideline and encompass the most commonly used values.
When inspecting glass components, Coresix incorporates the light condition to define the cosmetic requirements as “no defects visible" with the unaided eye under the specified light intensity, in the specified position and within the specified inspection time.
Coresix uses a standard “K Lux” to describe the required light intensity for a given inspection criterion. Any existing or known light intensity such as foot candle, wattage, etc. can generally be converted to a K Lux standard.
The angle, distance and/or orientation of the glass being inspected to the light source.
The longer an inspector looks at a glass component under any condition, the more likely he or she is to identify defects. For production efficiency, the specification is designed to identify the necessary cosmetic quality level in a minimal inspection time. Our standard inspection time averages 5-10 seconds per part.
At Coresix, we continually invest in the metrology equipment necessary to verify and advance our process results. Following is an overview of our inspection methods and capabilities:
|Dimensional||SmartScope™ Flash 500
(Non-contact Optical CMM)480mm x 430mm x 200mm measurement range
ErrorXY = 2.5 + 5L/1000 ìm where L = Length of part measured
|SmartScope™ Flash 200
(Non-contact Optical CMM)
|200mm x 200mm x 150mm measurement range
ErrorXY = 2.5 + 6L/1000 ìm where L = Length of part measured
ErrorZ = 5.0 + 6L/1000 ìm where L = Length of part measured
|3D Surface Map & Transmitted Wavefront||Zygo PTI 250P™||Fizeau Interferometer
Phase Measuring Interferometry for ë/100 uncertainty
RMS Repeatability: ë/6000 (1ó)
|Surface Roughness||Zygo NewView 6300™||Non-contact, three-dimensional, closed-looped, Piezo-based scanning white light interferometry
|Flatness||Tropel FlatMaster© 200||25mm to 200mm measurement range
Repeatability: 0.5 ìm
|TTV (Thickness Variance)||Air Gauge||Non-contact air gage system
Repeatability: 0.7 ìm