JPS5454528A - Optical reader - Google Patents
Optical readerInfo
- Publication number
- JPS5454528A JPS5454528A JP12105277A JP12105277A JPS5454528A JP S5454528 A JPS5454528 A JP S5454528A JP 12105277 A JP12105277 A JP 12105277A JP 12105277 A JP12105277 A JP 12105277A JP S5454528 A JPS5454528 A JP S5454528A
- Authority
- JP
- Japan
- Prior art keywords
- light
- amount
- transmission rate
- applied voltage
- light transmission
- 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
Abstract
PURPOSE: To avoid the mis-read-in due to the amount of light charge, by detecting the amount of light change of light source and changing the light transmission rate through the control of the applied voltage of liquid crystal.
CONSTITUTION: In the liquid crystal unit 4, the lower the applied voltage is, the higher the light transmission rate, and the higher the applied voltage becomes, the lower the light transmission rate is. Further, the voltage control circuit 5 increases the output voltage when the photo receiving amount of the photo electric conversion element 3 is greater, and controls the applied voltage of the unit 4 so that the output voltage is lower with lower light receiving amount. For example, if the light amount of the light source 1 is decreased, the light receiving amount of the element 3 is smaller. Accordingly, the output voltage of the circuit 5 is lowered and the light transmission rate is greater, increasing the light receiving amount for the element 3, and the amount of light reception is made stable for a given value
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12105277A JPS5454528A (en) | 1977-10-10 | 1977-10-10 | Optical reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12105277A JPS5454528A (en) | 1977-10-10 | 1977-10-10 | Optical reader |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5454528A true JPS5454528A (en) | 1979-04-28 |
Family
ID=14801634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12105277A Pending JPS5454528A (en) | 1977-10-10 | 1977-10-10 | Optical reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5454528A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60235277A (en) * | 1984-05-07 | 1985-11-21 | Nippon Denso Co Ltd | Optical information reader |
-
1977
- 1977-10-10 JP JP12105277A patent/JPS5454528A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60235277A (en) * | 1984-05-07 | 1985-11-21 | Nippon Denso Co Ltd | Optical information reader |
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