JPS55108080A - Photo electric conversion unit - Google Patents
Photo electric conversion unitInfo
- Publication number
- JPS55108080A JPS55108080A JP1497279A JP1497279A JPS55108080A JP S55108080 A JPS55108080 A JP S55108080A JP 1497279 A JP1497279 A JP 1497279A JP 1497279 A JP1497279 A JP 1497279A JP S55108080 A JPS55108080 A JP S55108080A
- Authority
- JP
- Japan
- Prior art keywords
- read
- conversion
- original
- photo electric
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Facsimile Image Signal Circuits (AREA)
- Character Input (AREA)
- Image Input (AREA)
- Facsimile Scanning Arrangements (AREA)
Abstract
PURPOSE: To establish the photo electric converter having the compensation means of conversion distortion, by performing photo electric conversion operation in advance, measuring and storing the conversion performance and evaluating the photo electric conversion signal according to the result of measurement, when the original is not at read in position.
CONSTITUTION: The reflection light of the original 10 radiated with the illumination means 20 is incident to the photo electric conversion circuit 40 via the optical system 30. The output electric signal is fed to the correction circuit 60 via the amplifying circuit 50. When the original is not at the read-in position, white diffusion and reflection plate is placed uniformly on the read in position, the circuit 60 calculates the signal VO from the distribution of illuminance on the read-in scanning line of the reflection plate. Since it is proportional to the conversion coefficient of the read-in system, and VREF obtained through the measurement of this value is stored in RAM in binary number of voltage dividing ratio N. Next, when the original is at read-in position, VREF is obtained from the measurement VO through the selection of voltage dividing potential. The comparison value compensating the conversion performance is given to the signal VO' read in actually for the real reading and the output V1 can be operated so that it can discriminate white and black correctly.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1497279A JPS55108080A (en) | 1979-02-14 | 1979-02-14 | Photo electric conversion unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1497279A JPS55108080A (en) | 1979-02-14 | 1979-02-14 | Photo electric conversion unit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55108080A true JPS55108080A (en) | 1980-08-19 |
JPH0130341B2 JPH0130341B2 (en) | 1989-06-19 |
Family
ID=11875883
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1497279A Granted JPS55108080A (en) | 1979-02-14 | 1979-02-14 | Photo electric conversion unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55108080A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5932037A (en) * | 1981-09-08 | 1984-02-21 | ゼロツクス・コ−ポレ−シヨン | Halftone threshold generation apparatus and method |
JPS5934761A (en) * | 1982-08-23 | 1984-02-25 | Matsushita Graphic Commun Syst Inc | Picture reader |
JPS59100666A (en) * | 1982-11-30 | 1984-06-09 | Matsushita Graphic Commun Syst Inc | Eprom writer |
JPS59147566A (en) * | 1983-02-10 | 1984-08-23 | Agency Of Ind Science & Technol | Device for eliminating effect of external light of visual sensor |
JPS60231273A (en) * | 1984-05-01 | 1985-11-16 | Hitachi Medical Corp | Picture reader |
JPH03219779A (en) * | 1990-08-17 | 1991-09-27 | Hitachi Ltd | Facsimile equipment |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04127242U (en) * | 1991-05-01 | 1992-11-19 | 日康ケミカル株式会社 | Cold insulation material |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50126132A (en) * | 1974-03-23 | 1975-10-03 | ||
JPS5317034A (en) * | 1976-07-30 | 1978-02-16 | Sharp Corp | Image sensor output correcting system |
JPS5374841A (en) * | 1976-12-15 | 1978-07-03 | Nec Corp | Television signal processor |
JPS5395518A (en) * | 1977-02-02 | 1978-08-21 | Nippon Telegr & Teleph Corp <Ntt> | Facsimile input system |
JPS551753A (en) * | 1978-06-20 | 1980-01-08 | Ricoh Co Ltd | Shading correction unit |
-
1979
- 1979-02-14 JP JP1497279A patent/JPS55108080A/en active Granted
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50126132A (en) * | 1974-03-23 | 1975-10-03 | ||
JPS5317034A (en) * | 1976-07-30 | 1978-02-16 | Sharp Corp | Image sensor output correcting system |
JPS5374841A (en) * | 1976-12-15 | 1978-07-03 | Nec Corp | Television signal processor |
JPS5395518A (en) * | 1977-02-02 | 1978-08-21 | Nippon Telegr & Teleph Corp <Ntt> | Facsimile input system |
JPS551753A (en) * | 1978-06-20 | 1980-01-08 | Ricoh Co Ltd | Shading correction unit |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5932037A (en) * | 1981-09-08 | 1984-02-21 | ゼロツクス・コ−ポレ−シヨン | Halftone threshold generation apparatus and method |
JPS5934761A (en) * | 1982-08-23 | 1984-02-25 | Matsushita Graphic Commun Syst Inc | Picture reader |
JPS6236425B2 (en) * | 1982-08-23 | 1987-08-06 | Matsushita Graphic Communic | |
JPS59100666A (en) * | 1982-11-30 | 1984-06-09 | Matsushita Graphic Commun Syst Inc | Eprom writer |
JPH0522432B2 (en) * | 1982-11-30 | 1993-03-29 | Matsushita Graphic Communic | |
JPS59147566A (en) * | 1983-02-10 | 1984-08-23 | Agency Of Ind Science & Technol | Device for eliminating effect of external light of visual sensor |
JPH0534869B2 (en) * | 1983-02-10 | 1993-05-25 | Kogyo Gijutsuin | |
JPS60231273A (en) * | 1984-05-01 | 1985-11-16 | Hitachi Medical Corp | Picture reader |
JPH03219779A (en) * | 1990-08-17 | 1991-09-27 | Hitachi Ltd | Facsimile equipment |
Also Published As
Publication number | Publication date |
---|---|
JPH0130341B2 (en) | 1989-06-19 |
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