JPS5696376A - Mark reading circuit - Google Patents
Mark reading circuitInfo
- Publication number
- JPS5696376A JPS5696376A JP17105279A JP17105279A JPS5696376A JP S5696376 A JPS5696376 A JP S5696376A JP 17105279 A JP17105279 A JP 17105279A JP 17105279 A JP17105279 A JP 17105279A JP S5696376 A JPS5696376 A JP S5696376A
- Authority
- JP
- Japan
- Prior art keywords
- threshold voltage
- mark
- ignored
- amplifier
- ideal rectifier
- 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
Abstract
PURPOSE: To discriminate always a mark accurately even if the illumination intensity is changed, by using an ideal rectifier, where forward voltage drop can be ignored, as the threshold voltage holding circuit.
CONSTITUTION: The output of photodiode 11 is given to operational amplifier 13 and diode 15, which form an ideal rectifier, through amplifier 12. The output is applied to threshold setting resistances 23 and 24 through capacitor 18, buffer amplifier 21, and so on. Thus, since forward voltage drop can be ignored by the ideal rectifier, the threshold voltage obtained from the connection point between resistances 23 and 24 is proportional to the white level voltage completely. Consequently, the threshold voltage is changed according to the change of the illumination intensity of the object by applying the threshold voltage to one input of comparator 14, and thus, the mark is always discriminated accurately.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17105279A JPS5696376A (en) | 1979-12-28 | 1979-12-28 | Mark reading circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17105279A JPS5696376A (en) | 1979-12-28 | 1979-12-28 | Mark reading circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5696376A true JPS5696376A (en) | 1981-08-04 |
JPS6223910B2 JPS6223910B2 (en) | 1987-05-26 |
Family
ID=15916180
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17105279A Granted JPS5696376A (en) | 1979-12-28 | 1979-12-28 | Mark reading circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5696376A (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55115168A (en) * | 1979-02-21 | 1980-09-04 | Ibm | Signal transfer detector |
-
1979
- 1979-12-28 JP JP17105279A patent/JPS5696376A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55115168A (en) * | 1979-02-21 | 1980-09-04 | Ibm | Signal transfer detector |
Also Published As
Publication number | Publication date |
---|---|
JPS6223910B2 (en) | 1987-05-26 |
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