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US4924081A
Expired / Lapsed
US
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Photo-electric converter having offset voltage correcting function
Assignee: Minolta Co Ltd
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Filing: 1988-09-21
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Granted: 1990-05-08
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Expires: 2008-09-21
Abstract
Abstract A photo-electric converter according to the present invention has a switching element connected between a photosensitive element and a photo-electric converting circuit and another switching element connected in parallel with the photosensitive element, and an output from the photo-electric converting circuit obtained by turning on and off the switching element is analogue-to-digital converted and arithmetically processed. Thereby an offset voltage in the photo-electric converter circuit can be corrected and an accurate output can be obtained by the photo-electric conversion.
Inventors
- 👤 Jiro Arima
- 👤 Yoshihiro Okui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:50
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/06; H03M1/0602; H03M1/0604; H03M1/0607; G; G01; G01J; G01J1/00; G01J1/42; G01J1/44; H04; H04N; H04N25/00; H04N25/70; H04N25/76; H04N25/77; H04N25/772; G01J2001/444; H03M1/12; H03M1/34; H03M1/38; H03M1/46; H03M1/50; H03M1/52
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
154 words
A photo-electric converter having an offset voltage correcting function, comprising: (a) a photosensitive means; (b) means for outputting a signal corresponding to an output of said photosensitive means; (c) a first switching means provided between said photosensitive means and said outputting means; (d) a second switching means connected in parallel with said photosensitive means; (e) means for analog-to-digital (A-D) conversion of a signal from said outputting means; (f) means for controlling ON and OFF states of said first and second switching means; (g) means for storing an output data from said A-D converting means when said first switching means is in OFF state and said second switching means is in ON state; and (h) means for calculating a difference between the output data from said A-D converting means when said first switching means is in ON state and said second switching means is in OFF state and the data stored in said storing means.
Claim 2
Dependent Claim
154 words
A photo-electric converter having an offset voltage correcting function, comprising: (a) a photosensitive means; (b) means for outputting a signal corresponding to an output of said photosensitive means; (c) a first switching means provided between said photosensitive means and said outputting means; (d) a second switching means connected in parallel with said photosensitive means; (e) means for analog-to-digital (A-D) conversion of a signal from said outputting means; (f) means for controlling ON and OFF states of said first and second switching means; (g) means for storing an output data from said A-D converting means when said first switching means is in OFF state and said second switching means is in ON state; and (h) means for calculating a difference between the output data from said A-D converting means when said first switching means is in ON state and said second switching means is in OFF state and the data stored in said storing means.
Claim 3
Dependent Claim
19 words
A photo-electric converter as claimed in claim 1, wherein said first and second switching means are semiconductor switching elements.
Claim 4
Dependent Claim
19 words
A photo-electric converter as claimed in claim 2, wherein said first and second switching means are field effect transistors.
Claim 5
Dependent Claim
20 words
A photo-electric converter as claimed in claim 2, wherein said first and second switching means are complementary metal-oxide-semiconductor logic circuits.
Claim 6
Dependent Claim
23 words
A photo-electric converter as claimed in claim 1, wherein said first switching means is connected through an earth line to said outputting means.
Claim 7
Dependent Claim
22 words
A photo-electric converter as claimed in claim 1, further comprising means for displaying a result of the calculation by said calculating means.
Claim 8
Dependent Claim
16 words
A photo-electric converter as claimed in claim 1, wherein said photosensitive means is a photoelectric device.
Claim 9
Dependent Claim
136 words
A photo-electric converter having an offset voltage correcting function, comprising: (a) a photosensitive means; (b) means for outputting a signal corresponding to an output of said photosensitive means; (c) a first switching means provided between said photosensitive means and said outputting means; (d) a second switching means connected in parallel with said photosensitive means; (e) means for controlling ON and OFF states of said first and second switching means; and (f) an up-down counter for counting down a value corresponding to a signal from said outputting means when said first switching means is in OFF state and said second switching means is in ON state, and counting up a value corresponding to a signal from the same means when said first switching means is in ON state and said second switching means is in OFF state.
Claim 10
Dependent Claim
136 words
A photo-electric converter having an offset voltage correcting function, comprising: (a) a photosensitive means; (b) means for outputting a signal corresponding to an output of said photosensitive means; (c) a first switching means provided between said photosensitive means and said outputting means; (d) a second switching means connected in parallel with said photosensitive means; (e) means for controlling ON and OFF states of said first and second switching means; and (f) an up-down counter for counting down a value corresponding to a signal from said outputting means when said first switching means is in OFF state and said second switching means is in ON state, and counting up a value corresponding to a signal from the same means when said first switching means is in ON state and said second switching means is in OFF state.
Claim 11
Dependent Claim
19 words
A photo-electric converter as claimed in claim 8, wherein said first and second switching means are semiconductor switching elements.
Claim 12
Dependent Claim
19 words
A photo-electric converter as claimed in claim 9, wherein said first and second switching means are field effect transistors.
Claim 13
Dependent Claim
20 words
A photo-electric converter as claimed in claim 9, wherein said first and second switching means are complementary metal-oxide-semiconductor logic circuits.
Claim 14
Dependent Claim
23 words
A photo-electric converter as claimed in claim 8, wherein said first switching means is connected through an earth line to said outputting means.
Claim 15
Dependent Claim
20 words
A photo-electric converter as claimed in claim 8, further comprising means for displaying a count value of said up-down counter.
Claim 16
Dependent Claim
15 words
A photo-electric converter as claimed in claim 8, wherein said photosensitive means is photoelectric device.
Claim 17
Dependent Claim
148 words
A converter having an offset voltage correcting function, comprising: (a) a sensor; (b) means for outputting a signal corresponding to an output of said sensor; (c) a first switching means provided between said sensor and said outputting means; (d) a second switching means connected in parallel with said sensor; (e) means for analog-to-digital (A-D) converting a signal from said outputting means; (f) means for controlling ON and OFF states of said first and second switching means; (g) means for storing an output data from said A-D converting means when said first switching means is in OFF state and said second switching means is in ON state; and (h) means for calculating a difference between the output data from said A-D converting means when said first switching means is in ON state and said second switching means is in OFF state and the data stored in said storing means.
Claim 18
Dependent Claim
148 words
A converter having an offset voltage correcting function, comprising: (a) a sensor; (b) means for outputting a signal corresponding to an output of said sensor; (c) a first switching means provided between said sensor and said outputting means; (d) a second switching means connected in parallel with said sensor; (e) means for analog-to-digital (A-D) converting a signal from said outputting means; (f) means for controlling ON and OFF states of said first and second switching means; (g) means for storing an output data from said A-D converting means when said first switching means is in OFF state and said second switching means is in ON state; and (h) means for calculating a difference between the output data from said A-D converting means when said first switching means is in ON state and said second switching means is in OFF state and the data stored in said storing means.
Claim 19
Dependent Claim
129 words
A passive photoelectric converter having an offset voltage correction function without the necessity of moving parts, comprising: a photosensitive means responsive to incident light for producing an output electrical signal; means for providing a corresponding output of the signal; means for electrically interconnecting the photosensitive means to the output means including a first switch member; means for electrically connecting the photo-sensitive means to ground, including a second switch member; means for controlling the operative state of the respective switch members, and means for processing the output of the providing means with each of the respective switch members alternatively open and closed relative to each other to provide a correction of the offset voltage that can influence the production of an output signal representative of the actual incidence of light.
Claim 20
Dependent Claim
129 words
A passive photoelectric converter having an offset voltage correction function without the necessity of moving parts, comprising: a photosensitive means responsive to incident light for producing an output electrical signal; means for providing a corresponding output of the signal; means for electrically interconnecting the photosensitive means to the output means including a first switch member; means for electrically connecting the photo-sensitive means to ground, including a second switch member; means for controlling the operative state of the respective switch members, and means for processing the output of the providing means with each of the respective switch members alternatively open and closed relative to each other to provide a correction of the offset voltage that can influence the production of an output signal representative of the actual incidence of light.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-05-07 | 1993-11-06 | 1994-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-07 | 1997-11-06 | 1998-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-07 | 2001-11-06 | 2002-05-08 | $7700.00 | Window Closed / Lapsed |