Hermetically Sealed Optical Window Technology by Tekna Seal and FloMet

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Hermetically sealed optical window technology delivers revolutionary results - developed through a new combination of Metal Injection Molded materials coupled with superior glass to metal sealing process.

http://www.teknaseal.com – Tekna Seal LLC, a custom manufacturer of glass to metal seals and ceramic to metal seals, and FloMet LLC today announce a new joint capability to make hermetically sealed optical windows using glass designed specifically for optical applications. The significance of this new process is that for the first time manufacturers of optical systems can now create hermetically sealed packages using the highest quality optical glass. The new process eliminates the compromise between the reliability of the seal or degrading the image quality due to thermal expansion mismatches between the bonded materials.

Tekna Seal’s oxide-free glass sealing process delivers improved optical windows that are used to protect cameras, photo detectors and imaging semiconductors such as CCD, CMOS and optical MEMS devices used in applications such as high definition television -HDTV. The helium leak rates of the hermetically sealed optical windows are well below current industry standards. Low leak rates are obtained using the Tekna Seal oxide-free process and provide the best protection available from contamination such as hydrocarbons or moisture thus extending the life of such optical window devices.

Until now, optical designers were faced with the choice between using substandard glass or tolerating stresses induced by the coefficient of thermal expansion (CTE) mismatch between the glasses and metals available. FloMet has leveraged its ability to create custom Metal Injection Molded (MIM) feedstocks designed with a specific CTE matching the glass selected for desired optical properties. This capability, in conjunction with Tekna Seal’s oxide-free glass sealing process, allows for a wider range of glass materials to be sealed as compared to conventional glass to metal sealing processes.

“While controlled expansion alloys have been commercially available for more than 100 years, the key benefits of using MIM controlled expansion alloys are that they can be tailored to accurate and repeatable CTE specs and made in smaller batch sizes unlike conventional wrought alloys. This allows us to be flexible and responsive to the development of new material combinations for optical windows,” said Arlan Clayton, president of Tekna Seal and FloMet.

The direct glass-to-MIM seals provided by Tekna Seal and FloMet have considerable cost advantages as well as significantly lower helium leak rates when compared to conventional hermetic sealing methods. The windows are optically configured after the sealing process which, in combination with CTE matched MIM alloys, provides the absolute lowest stress joint in a true hermetically sealed window.

To find out more about Hermetically Sealed Optical Window Technology please visit http://www.teknaseal.com/optical_windows.html or contact Tekna Seal at 763-574-1613

About Tekna Seal LLC

Tekna Seal, located in Minneapolis, is a custom manufacturer of glass to metal and ceramic to metal seals used for vacuum tight electrical feedthroughs used in sensors, battery terminals, and electronic packages. A proprietary hermetic sealing process provides seals with lower leak rates than industry standards, and a wider range of material choices that can be sealed. http://www.teknaseal.com

About FloMet LLC

FloMet, headquartered in DeLand, FL, is a custom manufacturer of precision specialty alloy components utilizing their proprietary metal injection molding technology. Major markets served are orthodontal appliances, disposable medical devices, soft magnetic parts, fuel cell components, and hermetic package system hardware. http://www.flomet.us

The information contained within this document has been disclosed in a pending patent filed by Tekna Seal LLC with the U.S. Patent Office.

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Doug McCarron
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