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公开(公告)号：CH504819A
公开(公告)日：1971-03-15
申请号：CH1047570
申请日：1970-07-10
Applicant: IBM
Inventor： ARMIN H DR FREI , PETER VETTIGER
IPC: H03F3/72 , H03G1/00 , H03K17/693 , H04J3/04
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Patent Agency Ranking
公开(公告)号：SG98006A1
公开(公告)日：2003-08-20
申请号：SG200007486
申请日：2000-12-15
Applicant: IBM
Inventor： MICHEL DESPONT , UTE DRECHSLER , MARK I LUTWYCHE , HUGO R ROTHUIZEN , PETER VETTIGER
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公开(公告)号：CH515659A
公开(公告)日：1971-11-15
申请号：CH1607470
申请日：1970-10-30
Applicant: IBM
Inventor： KARSTEN ELVIN DRANGEID , PETER VETTIGER
IPC: H01L29/00 , H03K17/687 , H03K17/72 , H01L19/00
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公开(公告)号：IT7928135D0
公开(公告)日：1979-12-18
申请号：IT2813579
申请日：1979-12-18
Applicant: IBM
Inventor： HEINRICH BAPST URS , FRITZ GFELLER , PETER VETTIGER
Abstract: An arrangement for separating disturbing ambient light from an optical data signal, comprising an interference filter (1), the passband of which matches the wavelength of the optical data signal, and further comprising two photodiodes which are so arranged that one photodiode receives the light (IS, IAT) transmitted through the interference filter, and that the other receives the reflected light (IAR). Adjusting means, e.g., in the form of a settable aperture (4) or an additional simple filter (5) are provided for adjusting the transmitted and reflected portions of the ambient light to each other. Output signal (S1, S2) of both photodiodes are subtracted from each other in compensation circuitry (6). This results in compensation of the ambient light components so that at the output a signal (SR) is available which depends only on the actual data signal (IS).
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公开(公告)号：CH522330A
公开(公告)日：1972-06-15
申请号：CH811371
申请日：1971-06-03
Applicant: IBM
Inventor： ARMIN H DR FREI , HANS RUDOLF SCHINDLER , PETER VETTIGER
IPC: H04N7/32 , H04N19/124 , H04N19/50 , H03K13/22
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公开(公告)号：CH519269A
公开(公告)日：1972-02-15
申请号：CH752571
申请日：1971-05-24
Applicant: IBM
Inventor： HANS RUDOLF SCHINDLER , PETER VETTIGER
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