Active solid-state devices (e.g. – transistors – solid-state diode – Responsive to non-electrical signal – Electromagnetic or particle radiation
Reexamination Certificate
2007-03-22
2009-02-17
Menz, Douglas M (Department: 2891)
Active solid-state devices (e.g., transistors, solid-state diode
Responsive to non-electrical signal
Electromagnetic or particle radiation
C257S184000
Reexamination Certificate
active
07492025
ABSTRACT:
A photo coupler includes a semiconductor laser, a semiconductor light-receiver, a resin protector, a reflective film, a light pipe, and electrodes. The light pipe is made of resin, has a rectangular parallelepiped shape, and is provided so as to surround an outer circumferential portion of the semiconductor light-receiver. On a center portion of an upper surface of the light pipe, a recessed portion shaped in a frustum of quadrangular pyramid tapered toward the semiconductor light-receiver is formed. The reflective film is shaped in a frustum surface of pyramid tapered toward the semiconductor light-receiver, and is formed on side surfaces of the recessed portion.
REFERENCES:
patent: 6832861 (2004-12-01), Kragl
patent: 2001-358361 (2001-12-01), None
Ichihara Jun
Yamazaki Tomohiro
McDermott Will & Emery LLP
Menz Douglas M
ROHM Co. Ltd.
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