For more than 20 years we have been successfully using our coating know-how in the medical device market. Our core competence lies in the integration of sapphire windows into optical medical analysis devices (hermetic packaging), for example for endoscopy. We produce among others solderable coatings and sterilization-resistant optical filters for camera systems.
The main disadvantage of sapphire crystal is its very high refractive index (1.77). This causes a high reflection of the incident light, greater than approx. 15% (approx. 7.5% per side).
The anti-reflective layers applied on one or both sides of the lens or sapphire window reduce this reflection in order to avoid the formation of ghost images and to maximize the intensity of the light signal transmitted through the endoscope.
Anti-reflective coatings are applied to both sapphire and mineral crystals. Blösch SA's portfolio is based on 5 anti-reflective layers used in the field of medical devices:
Blösch has a great know-how in the metallization of complex geometric parts, also with a structuring operation if necessary.
In order to achieve high quality assemblies, our unique technology combining PVD and galvanic deposition allows you to deposit multilayers for gold, tin or copper soldering. The structure of our PVD multilayer gives us the possibility to include "anti-diffusion" layers allowing the assembly of various materials by brazing (e. g. sapphire, ceramic, steel).
This technology is commonly used to assemble the last sapphire lens at the end of a rigid endoscope by low temperature brazing. The assembly is guaranteed to be helium-tight, autoclavable and meets the requirements of the regulations in force in the medical field.
In order to achieve high quality assemblies in highly corrosive environments or for allergenic reasons, a Nickel-free weldable layer is available.
Blösch benefits from metallic PVD coating technology that allows the deposition of thin layers with high reflectivity. Several mirror layer variants with or without masking, on geometries with different bending radii are available depending on your application.
Blösch has extensive experience in the deposition of black coatings based on chromium or carbon. These thin layers are opaque and can be applied to all types of glass.
For medical imaging applications, a layer of black chromium deposited around the sapphire lens improves optical contrast and image quality.
This type of layer combines perfectly with solderable coatings.
It is possible to place an ultrathin electrode with or without masking on electrical insulating glass or ceramic part. Blösch offers you our know-how in the deposition of conductive coatings of different types.
