JPS5635280A - Information reading device - Google Patents
Information reading deviceInfo
- Publication number
- JPS5635280A JPS5635280A JP10974079A JP10974079A JPS5635280A JP S5635280 A JPS5635280 A JP S5635280A JP 10974079 A JP10974079 A JP 10974079A JP 10974079 A JP10974079 A JP 10974079A JP S5635280 A JPS5635280 A JP S5635280A
- Authority
- JP
- Japan
- Prior art keywords
- output
- circuit
- converter
- value
- analog value
- 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.)
- Pending
Links
Landscapes
- Character Input (AREA)
Abstract
PURPOSE: To realize a reading of the information with a reduced amount of errors and with a comparatively simple device, by holding the output of the line sensor at the peak value holding circuit and then dividing the sensor output to use for the reference voltage of the D/A converter.
CONSTITUTION: The output of the line sensor LNS is held at the peak value holding circuit PH, and the output of this circuit is divided by the resistance elements R1, and R2 to be applied to the operational amplifier OP. And the working point of the amplifier OP plus the values of the element R1 and R2 are selected so that the output of the OP may be turned into the voltage value of about 80% the output of the circuit PH. At the same time, the voltage value of 20% the output of the circuit PH is applied to the D/A converter in the form of the reference voltage. On the other hand, the brightest white signal among the memory MEM is applied to the D/A converter, and thus the analog value is obtained when the outout of the circuit PH changes and by the reference voltage according to the change of the output. This analog value is then amplified AMP, and then the output of the amplifier OP is piled on the analog value. Thus the analog value to which a sufficient correction of the white level has been given can be obtained. Accordingly, the working of the A/D converter 1 becomes accurate.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10974079A JPS5635280A (en) | 1979-08-30 | 1979-08-30 | Information reading device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10974079A JPS5635280A (en) | 1979-08-30 | 1979-08-30 | Information reading device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5635280A true JPS5635280A (en) | 1981-04-07 |
Family
ID=14518040
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10974079A Pending JPS5635280A (en) | 1979-08-30 | 1979-08-30 | Information reading device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5635280A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62174891A (en) * | 1986-01-28 | 1987-07-31 | Usac Electronics Ind Co Ltd | High speed white level follower circuit |
-
1979
- 1979-08-30 JP JP10974079A patent/JPS5635280A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62174891A (en) * | 1986-01-28 | 1987-07-31 | Usac Electronics Ind Co Ltd | High speed white level follower circuit |
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