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Autoclaveable miniaturized video endoscopes with simplified flip-chip assembly

: Beckert, E.; Wippermann, F.; Walther, S.; Burkhardt, T.; Messerschmidt, B.; Bartnitzek, T.; Vahrenkamp, T.; Eberhardt, R.; Gäbler, D.; Tünnermann, A.


Tearney, G.J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Endoscopic Microscopy VI. Proceedings : SPIE Photonics West, BIOS Conference, 22 - 26 January 2011, San Francisco, California, United States
Bellingham, WA: SPIE, 2011 (SPIE Proceedings 7893)
ISBN: 978-0-8194-8430-7
Paper 78930B
Conference "Endoscopic Microscopy" <6, 2011, San Francisco/Calif.>
Photonics West Conference <2011, San Franciso/Calif.>
Fraunhofer IOF ()
miniaturized camera; endoscopy; hermeticity; chip in the tip

Miniaturized video endoscopes with an imager located at the distal end and a simplified opto-mechanical layout are
presented. They are based on a CMOS imager with 650 x 650 pixels of 2.8 ?m pitch and provide straight view with 75 °
and 110 ° field of view at f/4.3. They have an outer diameter of 3 mm including the shell and a length of approx. 8 mm.
The optics consist of polymer lenses in combination with a GRIN and a dispensed lens. Using a simple flip chip
assembly, optical axis alignment better than 10 ?m and a contrast of 30 % at 90 LP/mm was achieved. The 75 ° FOV
system was sealed at the front window using a solderjetting technology, providing 10-9 mbar*l/s leakage rates even after several autoclave cycles.