Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1990-09-20
1993-02-23
James, Andrew J.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 48, 257 72, 257 84, H01L 2714, H01L 3100
Patent
active
051895005
ABSTRACT:
A multi-layer type semiconductor device is disclosed, in which a plurality of semiconductor layers are formed in vertically opposite directions. The multi-layer type semiconductor device is obtained by forming a first semiconductor layer, an insulating layer and a second semiconductor layer in the mentioned order on a main surface of a first substrate, forming a semiconductor device by using the second semiconductor layer as a base, with an exposed surface thereof directed upward, forming an insulating film on the semiconductor device, attaching a second substrate to the insulating film, thinning the first substrate to expose the first semiconductor layer, and forming a further semiconductor device by using the first semiconductor layer as a base, with an exposed surface of the first semiconductor layer directed upward. A single- chip type image forming system or sensing system may be provided by employing, as the semiconductor devices, a sensing device such as a photosensor, a pressure sensor or the like, a processing circuit for processing a signal received from the sensor, and a display device for displaying results of the processing. A large number of pads may be provided by arranging the pads on opposite surfaces of a chip.
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Crane Sara W.
James Andrew J.
Mitsubishi Denki & Kabushiki Kaisha
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