Molded TO Caps & Lenses

Product Description

Optical sensors are highly sensitive to a number of environmental conditions, and are particularly vulnerable to damage caused by humidity and certain chemicals. They can be protected by welding protective TO caps to the TO headers in which they are housed. However, at the same time, it is vital to ensure that the caps meet a range of optical requirements to ensure the consistent transmission of optical signals.

SCHOTT molded TO caps, also referred to as "direct seal caps" are sealed hermetically by fusing the glass directly to the metal frame without the use of any other interface materials. This is achieved by reheating cooled glass and then fusing it with the metal. The fusion process must be designed in such a way to ensure that the glass cools down without the formation of bubbles and inclusions and obtains the correct optical properties, which is often subject to very low tolerance limits.

Fusion molded TO caps can also be manufactured with windows and convex (plano and biconvex) lenses, and with various kinds of filters for special applications. Windows and lenses can be supplied in a range of designs and according to customer specifications.

Advantages

We carry a full assortment of standard windows and lenses. The caps provide a high level of safety and reliably retain their optical properties over the years.

Since the glass used in these applications only obtains its optical properties after fusion, these caps can be manufactured from untreated industrial glasses.

Applications

Molded caps are particularly suitable for use with integrating sensors, for example for light intensity measurements (motion sensors, infrared temperature measurement, etc…), and can be used for encapsulating photodiodes for use as receivers in data communication.

Technical Details

Technology

The caps are generally manufactured from Kovar® (ASTM-F15) and types of glasses particularly suited for use in UV light. The finished product can be electroplated to customer specifications.

Please refer to our glass-to-metal seal technology page for more information about this hermetic sealing process.


Features / Specifications

The caps can also be supplied with various optical coatings, including:
  • Anti-reflective coatings
  • Beam splitters
  • Filters
Please refer to our Optical Properties section for more information on coatings.


Forms of Supply and Product Packaging

All products can be supplied in loose form or packaged individually and supplied on trays.

Quality

All our production facilities are ISO 9001 certified. All our TO headers and caps comply with the International Telcordia Specifications and all products are ROHS compatible.
Trade Fairs & Events
30.
May
Trade fair Materials, Veldhoven, Netherlands, 30.05 - 31.05.2018
05.
September
Trade fair CIOE - China International Optoelectronic Expo, Shenzhen, China, 05.09 - 08.09.2018
17.
September
Trade fair Gastech, Barcelona, Spain, 17.09 - 20.09.2018
25.
September
Trade fair European Microwave Week, Madrid, Spain, 25.09 - 27.09.2018
Contact
SCHOTT AG
Christoph-Dorner-Strasse 29
84028 Landshut
Germany
E-Mail to SCHOTT+49 (0)871/826-0
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