JPS5581319A - Optical information reader - Google Patents
Optical information readerInfo
- Publication number
- JPS5581319A JPS5581319A JP15514078A JP15514078A JPS5581319A JP S5581319 A JPS5581319 A JP S5581319A JP 15514078 A JP15514078 A JP 15514078A JP 15514078 A JP15514078 A JP 15514078A JP S5581319 A JPS5581319 A JP S5581319A
- Authority
- JP
- Japan
- Prior art keywords
- hologram
- scanning
- thru
- constitution
- reflected light
- 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 make reading accurate by specifying the constitution hologram substrates.
CONSTITUTION: The X-direction-scanning hologram regions X1' thru X9' of a read window region 5 of a fan shape mutually having an equal center angle α as well as the Y-direction-scanning hologram regions Y1' thru Y3' of the read window region 5 of a fan shape having the center angle α and forming holograms over the 1st and 3rd entire surfaces and strip-form holograms over the 2nd entire surface are provided on a hologram disc 9. The reflected light from the information carrier having been photo scanned through the fan-shaped aperture 11 which is 2α in the central angle of an optical mask 10 is led to a photo detector 6. As a result of this, the condensing areas of the reflected light from the information carrier become constant with all the scanning lines, the area of the aperture 11 is reduced, the incident quantity of external light is reduced, the information signal of superior S/N is obtained and the intended object is achieved.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15514078A JPS5581319A (en) | 1978-12-14 | 1978-12-14 | Optical information reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15514078A JPS5581319A (en) | 1978-12-14 | 1978-12-14 | Optical information reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5581319A true JPS5581319A (en) | 1980-06-19 |
JPS6321169B2 JPS6321169B2 (en) | 1988-05-06 |
Family
ID=15599415
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15514078A Granted JPS5581319A (en) | 1978-12-14 | 1978-12-14 | Optical information reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5581319A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57204022A (en) * | 1981-06-08 | 1982-12-14 | Ibm | Optical scanner |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH075988U (en) * | 1993-06-23 | 1995-01-27 | 株式会社東郷製作所 | Slip joint for seat belt |
-
1978
- 1978-12-14 JP JP15514078A patent/JPS5581319A/en active Granted
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57204022A (en) * | 1981-06-08 | 1982-12-14 | Ibm | Optical scanner |
JPH0363048B2 (en) * | 1981-06-08 | 1991-09-27 | Intaanashonaru Bijinesu Mashiinzu Corp |
Also Published As
Publication number | Publication date |
---|---|
JPS6321169B2 (en) | 1988-05-06 |
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