Solid-state imaging apparatus
First Claim
1. A solid-state imaging apparatus for capturing a one-dimensional optical image, said apparatus comprising:
- a line type photosensitive section comprising a plurality of photosensitive pixels, said photosensitive pixels being arranged along a predetermined direction, each of said photosensitive pixels converting an input light signal into a current signal and outputting the current signal;
integrating circuits arranged for said photosensitive pixels respectively, each of said integrating circuits selectively performing an integrating operation for the current signal output from the corresponding photosensitive pixel and an initial voltage level setting operation for an output signal;
clamping circuits arranged for said integrating circuit respectively, each of the clamping circuits selectively performing a clamping processing for a signal output from the corresponding integrating circuit and an initial voltage level setting operation for an output signal;
sample-and-hold circuits arranged for said clamping circuits respectively, each of said sample-and-hold circuits selectively performing a sampling and holding operation for a signal output from the corresponding clamping circuit;
first capacity elements arranged for said sample-and-hold circuits respectively, each of said first capacity elements outputting an AC component based on a signal output from the corresponding sample-and-hold circuit;
first switches arranged for said first capacity elements respectively, each of said first switches controlling an output of said first capacity element;
a data signal output circuit for performing an output operation of an output data signal based on a signal input from one of said first switches and setting an initial-voltage setting operation for an input terminal selectively; and
a timing control section for controlling operation timings of said plurality of photosensitive pixels, said integrating circuits, said clamping circuits, said sample-and-hold circuits, said first switches, and said data signal output circuit,wherein said timing control section instructs;
said integrating circuits and said clamping circuits to perform the initial voltage level setting operation about the output terminals of said integrating circuits before the current signals are read out from said plurality of photosensitive pixels;
said first switches and said data signal output circuit to perform the initial voltage level setting operation about the output terminals of said first capacity elements and the input terminals of said data signal output circuit over a period extending from a time before the current signals are read out from the plurality of photosensitive pixels till a time at which said signal is being read out;
said integrating circuits to perform the integrating operation;
said clamping circuits to perform the clamping processing;
said sample-and-hold circuits to perform the sampling operation during a period in which the current signal is being read out from said plurality of photosensitive pixels; and
said clamping circuits to perform the initial voltage level setting operation, said sample-and-hold circuits to perform the sampling operation, said first capacity element to perform the output operation, and said data signal output circuit to perform the output operation during a period in which a signal is read out from said first capacity element after the current signals are read out from said plurality of photosensitive pixels.
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Accused Products
Abstract
In the solid-state imaging apparatus of the present invention, when a signal is output from the capacity element to the data signal output circuit, the voltage of the output terminal of the capacity element is kept at that attained when the switch was previously opened, namely, the initial voltage of the input terminal of the data signal output circuit, whereby the voltage of the input terminal of the data signal output circuit is stable without fluctuation. Therefore, no noise is generated in the output signal at the instant when the capacity element and data signal output circuit are short-circuited, whereby optical images can be captured with a high accuracy in a high speed.
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Citations
20 Claims
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1. A solid-state imaging apparatus for capturing a one-dimensional optical image, said apparatus comprising:
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a line type photosensitive section comprising a plurality of photosensitive pixels, said photosensitive pixels being arranged along a predetermined direction, each of said photosensitive pixels converting an input light signal into a current signal and outputting the current signal; integrating circuits arranged for said photosensitive pixels respectively, each of said integrating circuits selectively performing an integrating operation for the current signal output from the corresponding photosensitive pixel and an initial voltage level setting operation for an output signal; clamping circuits arranged for said integrating circuit respectively, each of the clamping circuits selectively performing a clamping processing for a signal output from the corresponding integrating circuit and an initial voltage level setting operation for an output signal; sample-and-hold circuits arranged for said clamping circuits respectively, each of said sample-and-hold circuits selectively performing a sampling and holding operation for a signal output from the corresponding clamping circuit; first capacity elements arranged for said sample-and-hold circuits respectively, each of said first capacity elements outputting an AC component based on a signal output from the corresponding sample-and-hold circuit; first switches arranged for said first capacity elements respectively, each of said first switches controlling an output of said first capacity element; a data signal output circuit for performing an output operation of an output data signal based on a signal input from one of said first switches and setting an initial-voltage setting operation for an input terminal selectively; and a timing control section for controlling operation timings of said plurality of photosensitive pixels, said integrating circuits, said clamping circuits, said sample-and-hold circuits, said first switches, and said data signal output circuit, wherein said timing control section instructs; said integrating circuits and said clamping circuits to perform the initial voltage level setting operation about the output terminals of said integrating circuits before the current signals are read out from said plurality of photosensitive pixels; said first switches and said data signal output circuit to perform the initial voltage level setting operation about the output terminals of said first capacity elements and the input terminals of said data signal output circuit over a period extending from a time before the current signals are read out from the plurality of photosensitive pixels till a time at which said signal is being read out; said integrating circuits to perform the integrating operation; said clamping circuits to perform the clamping processing; said sample-and-hold circuits to perform the sampling operation during a period in which the current signal is being read out from said plurality of photosensitive pixels; and said clamping circuits to perform the initial voltage level setting operation, said sample-and-hold circuits to perform the sampling operation, said first capacity element to perform the output operation, and said data signal output circuit to perform the output operation during a period in which a signal is read out from said first capacity element after the current signals are read out from said plurality of photosensitive pixels. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A solid-state imaging apparatus for capturing a two-dimensional optical image, said apparatus comprising:
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an area type photosensitive section having a first number of line type photosensitive sections arranged along a first direction and common signal lines arranged for said line type photosensitive sections, each of said line type photosensitive sections having a second number of photosensitive pixels arranged along a second direction, each of said photosensitive pixels converting an input light signal into a current signal, each of said photosensitive pixels in said line type photosensitive sections outputting the current signal to the corresponding common signal line; integrating circuits arranged for said line type photosensitive sections respectively, each of said integrating circuits selectively performing an integrating operation for a signal output from the corresponding line type photosensitive section and an initial voltage level setting operation for an output signal; clamping circuits arranged for said integrating circuits respectively, each of said clamping circuits selectively performing a clamping processing for a signal output from the corresponding integrating circuit and an initial voltage level setting operation for an output signal; sample-and-hold circuits arranged for said clamping circuits respectively, each of sample-and-hold circuits selectively performing sampling and holding operations for a signal output from the corresponding clamping circuit; first capacity elements arranged for said sample-and-hold circuits respectively, each of first capacity elements performing an output processing of an AC component based on a signal output from the corresponding sample-and-hold circuit; first switches arranged for said first capacity elements respectivly, each of said switches controlling an output of the corresponding first capacity element; a data signal output circuit for selectively performing an output processing of respective output data signal based on a signal output from one of said first switches and an initial-voltage setting operation for an input terminal; and a timing control section for controlling operation timings of said photosensitive pixels, said integrating circuits, said clamping circuits, said sample-and-hold circuits, said first switches, and said data signal output circuit, wherein said timing control section instructs; said integrating circuits and clamping circuits to perform the initial voltage level setting operation before a signal is read out from one photosensitive pixel selected from said photosensitive pixels in each of said line type photosensitive sections; said first switches and said data signal output circuit to perform the initial voltage setting operation about the output terminals of said first capacity elements and the input terminal of said data signal output circuit over a period extending from a time before the signal is read out from one photosensitive pixel selected from the photosensitive pixels in each of said line type photosensitive sections till a time at which said signal is being read out; said integrating circuits to perform the integrating operation; said clamping circuits to perform the clamping processing; said sample-and-hold circuits to perform the sampling operation during a period in which the signal is being read out from one photosensitive pixel selected from the photosensitive pixels in each of said line type photosensitive sections; said data signal output circuit to perform the initial voltage setting operation about the input terminal of said data signal output circuit during a period in which a signal is being read out from one of said first capacity elements corresponding to one line type photosensitive section selected from said line type photosensitive sections after the signal is read out from one photosensitive pixel selected from the line type photosensitive pixels in each of said line type photosensitive sections; and one of said clamping circuits corresponding to one line type photosensitive section selected from said line type photosensitive sections to perform the initial voltage level setting operation; one of said sample-and-hold circuits corresponding to one line type photosensitive section selected from said line type photosensitive sections to perform the sampling operation; one of said first capacity elements corresponding to one line type photosensitive section selected from said line type receiving sections to perform the output processing; and said data signal output circuit to perform the output processing. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification