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公开(公告)号：CA2166256A1
公开(公告)日：1997-06-29
申请号：CA2166256
申请日：1995-12-28
Applicant: IBM CANADA
Inventor： TAGLIONE JOHN V , CAPPA MAURUS
Abstract: An optical signal data transceiver comprises a convex mirror to direct received optical signals onto at least one detector responsive to corresponding optical wavelengths. At least one optical emitter is arranged to irradiate the convex mirror such that the emitted optical radiation is reflected from said convex mirror in a diffuse manner. The specific shape of the convex mirror is selected to obtain a desired transmission and reception specificity and suitable shapes include, as non limiting examples, segments of spheres, hemispheres, paraboloids of revolution, right cones, etc.
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公开(公告)号：CA2166256C
公开(公告)日：2002-07-02
申请号：CA2166256
申请日：1995-12-28
Applicant: IBM CANADA
Inventor： TAGLIONE JOHN V , CAPPA MAURUS
Abstract: An optical signal data transceiver comprises a convex mirror to direct received optical signals onto at least one detector responsive to correspond ing optical wavelengths. At least one optical emitter is arranged to irradiate the conve x mirror such that the emitted optical radiation is reflected from said convex mirror in a diffuse manner. The specific shape of the convex mirror is selected to obtain a desi red transmission and reception specificity and suitable shapes include, as non l imiting examples, segments of spheres, hemispheres, paraboloids of revolution, right cones, etc.
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公开(公告)号：CA1079804A
公开(公告)日：1980-06-17
申请号：CA273926
申请日：1977-03-14
Applicant: IBM CANADA
Inventor： CAPPA MAURUS
Abstract: Field Effect Transistor (FET) integrated circuits can be deleteriously affected by positive voltages without compensating negative voltages. This problem can be overcome by providing a sequencing circuit which prevents the application of positive voltages without compensating negative voltages. This can be accomplished by providing one electronic switch in the positive lead and connecting a second electronic switch to the control electrode of the first switch. The second switch is only conductive when the negative voltage is available and the first switch can only be conductive when the second switch is conductive. A delay circuit ensures that the second switch is conductive only after the negative voltage is applied to the load and a charge storage device ensures that negative potential is applied to the load after removal of the negative power source to ensure removal of positive potential to the load before the negative potential is removed.
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