JPS5468204A - Optical information reader - Google Patents
Optical information readerInfo
- Publication number
- JPS5468204A JPS5468204A JP13498977A JP13498977A JPS5468204A JP S5468204 A JPS5468204 A JP S5468204A JP 13498977 A JP13498977 A JP 13498977A JP 13498977 A JP13498977 A JP 13498977A JP S5468204 A JPS5468204 A JP S5468204A
- Authority
- JP
- Japan
- Prior art keywords
- luminous flux
- information reading
- light reflecting
- reflecting face
- focal position
- 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
- 230000003287 optical effect Effects 0.000 title abstract 4
- 230000004907 flux Effects 0.000 abstract 9
- 238000001514 detection method Methods 0.000 abstract 3
- 230000010355 oscillation Effects 0.000 abstract 1
Landscapes
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
Abstract
PURPOSE: To enable detection of both to be performed with an optical means by utilizing an information reading luminous flux for detection of the focal position of an optical lens for focusing the luminous flux for information reading on a video disc and the detection of a beam spot position.
CONSTITUTION: The luminous flux which is made to an approximately parrallel luminous flux in one of the two mutually perpendicularly inersecting sections parallel to the advancing direction and is made to a divergent or convergent luminous flux in other section is used as a luminous flux 11 for information reading. Such luminous flux 11 passes through a light transmittable plate form body 12 such as galss or the like which oscillates about the axis on the plane approximately perpendicular to the advancing direction of said luminous flux 11 and is condensed onto a light reflecting face 17 by an optical lens 16. The reflected luminous flux from the light reflecting face 17 is led to photo detectors 19, 21. The output of the phot detector 19 is led to a focal position gradual adjusting mechanism 20, whereby the focal position is matched to the light reflecting face 17. The reference position of the oscillation of the plate form body 12 is controlled so that the signal component in the output of the photo detector 21 becomes maximum, whereby the beam spot is always maintained on the track.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13498977A JPS5468204A (en) | 1977-11-10 | 1977-11-10 | Optical information reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13498977A JPS5468204A (en) | 1977-11-10 | 1977-11-10 | Optical information reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5468204A true JPS5468204A (en) | 1979-06-01 |
Family
ID=15141320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13498977A Pending JPS5468204A (en) | 1977-11-10 | 1977-11-10 | Optical information reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5468204A (en) |
-
1977
- 1977-11-10 JP JP13498977A patent/JPS5468204A/en active Pending
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