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US4772957A
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Photoelectric conversion apparatus
Assignee: Canon Inc
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Filing: 1987-04-09
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Granted: 1988-09-20
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Expires: 2007-04-09
Abstract
Abstract A photoelectric conversion apparatus includes light reception elements which are rendered enabled under application of voltage; a first memory section for storing outputs from the light reception elements in the enabled state; a second memory section for storing outputs from the light reception elements in a disabled state; and an arithmetic operation circuit for correcting the contents of the first memory section in accordance with the contents of the second memory section.
Inventors
- 👤 Katsumi Nakagawa
- 👤 Hideo Kanno
- 👤 Yasuo Kuroda
- 👤 Katsunori Hatanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:03
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40056
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A photoelectric conversion apparatus comprising: a light receiver for generating and outputting a photoelectric conversion signal according to a quantity of light received during application of voltage; means for applying the voltage to said light receiver; an amplifier for amplifying an output of said light receiver, thereby to produce an amplified output of said light receiver; a first memory for storing the amplified output from said light receiver during application of the voltage; a second memory for storing the amplified output from said light receiver during non-application of the voltage; and an arithmetic operation circuit for cancelling noise included in the signal stored in said first memory by means of the signal stored in said second memory.
Claim 2
Dependent Claim
117 words
A photoelectric conversion apparatus comprising: a light receiver for generating and outputting a photoelectric conversion signal according to a quantity of light received during application of voltage; means for applying the voltage to said light receiver; an amplifier for amplifying an output of said light receiver, thereby to produce an amplified output of said light receiver; a first memory for storing the amplified output from said light receiver during application of the voltage; a second memory for storing the amplified output from said light receiver during non-application of the voltage; and an arithmetic operation circuit for cancelling noise included in the signal stored in said first memory by means of the signal stored in said second memory.
Claim 3
Dependent Claim
17 words
a photoelectric conversion apparatus according to claim 1, wherein said light receiver is a light reception element.
Claim 4
Dependent Claim
16 words
A photoelectric conversion apparatus according to claim 1, wherein said light receiver is a photosensor array.
Claim 5
Dependent Claim
34 words
A photoelectric conversion apparatus according to claim 1, wherein said light receiver comprises a plurality of light reception elements which are divided into blocks each having a predetermined number of said light reception elements.
Claim 6
Dependent Claim
16 words
A photoelectric conversion apparatus according to claim 1, wherein said first memory is a shift register.
Claim 7
Dependent Claim
16 words
A photoelectric conversion apparatus according to claim 1, wherein said second memory is a shift register.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |