Radiant energy – Invisible radiant energy responsive electric signalling – Semiconductor system
Patent
1995-02-24
1996-04-23
Fields, Carolyn E.
Radiant energy
Invisible radiant energy responsive electric signalling
Semiconductor system
2502081, 25037009, 257222, 257225, 348311, 378988, 378191, H04M 532, G01T 120
Patent
active
055106234
ABSTRACT:
A solid state image sensor CCD array (10a) has a two block, full-frame, parallel-register structure. The two blocks of the array, each comprised of photosensitive radiation sensors or pixels (20), feed into a single centrally disposed serial read-out register (10b) so as to form one unified photosensitive domain. The read-out register is photosensitive except for two associated narrow clock buses (H1, H2) that are spaced apart so as to only block a minimum of input radiation in any one pixel (22) of the read-out register. Each stage of the read-out register can act as a pixel that is approximately square and that is approximately the same size as the pixels of the two full-frame blocks. In operation, the centrally disposed read-out register can be stationary for a significant first portion of a total frame time (integration period), and then in a latter part of the frame time it can be read out one or more times to provide exposure update information for all of the pixels of the array. Typical examples of applications include advanced histogram-based, or other types of, X-ray exposure optimization. The array avoids the use of an "amplifier corner" that is characteristic of most if not all area image sensors. As such, all four corners of the array can be shaped to suit a particular application. One application of particular interest is for intra-oral dental X-ray imager and system.
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Onishi Steven
Sayag Michel
Fields Carolyn E.
Loral Fairchild Corp.
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