JPS57100636A - Optical information reader - Google Patents
Optical information readerInfo
- Publication number
- JPS57100636A JPS57100636A JP17702480A JP17702480A JPS57100636A JP S57100636 A JPS57100636 A JP S57100636A JP 17702480 A JP17702480 A JP 17702480A JP 17702480 A JP17702480 A JP 17702480A JP S57100636 A JPS57100636 A JP S57100636A
- Authority
- JP
- Japan
- Prior art keywords
- mirror
- focus lens
- error signal
- lens
- reflected
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To increase frequency response range up to a high frequency band, by reducing the weight of a driving part by obtaining a beam which centers on the optical axis of a focus lens by displacing a mirror synchronizing with the parallel movement of the focus lens in a disk radius direction, and by making its reflected light incident to a disk. CONSTITUTION:Light emitted from a laser 7 is passed through a beam splitter 9 to obtain a parallel beam, which is reflected by a mirror 12 and then passed through an lambda/4 plate 10 and a focus lens 5 to be focused on a disk 1. Its reflected light travels backward, and is reflected by the beam splitter 9 to be focused on a detector 2 through a cylinder lens 8. A focus error signal and a tracking error signal are detected as an output difference (B1+B3)-(B2+B4) and a (B1+ B4)-(B2+B3). The tracking error signal is applied to driving devices which drives the focus lens 5 in a direction X and the mirror in an S, thereby moving the lens 5 and mirror 12 synchronously. Consequently, the weight of the driving part is reduced and frequency response range is increased.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17702480A JPS57100636A (en) | 1980-12-15 | 1980-12-15 | Optical information reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17702480A JPS57100636A (en) | 1980-12-15 | 1980-12-15 | Optical information reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57100636A true JPS57100636A (en) | 1982-06-22 |
JPH0213374B2 JPH0213374B2 (en) | 1990-04-04 |
Family
ID=16023817
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17702480A Granted JPS57100636A (en) | 1980-12-15 | 1980-12-15 | Optical information reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57100636A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5914138A (en) * | 1982-07-14 | 1984-01-25 | Minolta Camera Co Ltd | Tracking control optical system of optical disk |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55135340A (en) * | 1979-04-06 | 1980-10-22 | Discovision Ass | Apparatus for keeping scanning means in place |
-
1980
- 1980-12-15 JP JP17702480A patent/JPS57100636A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55135340A (en) * | 1979-04-06 | 1980-10-22 | Discovision Ass | Apparatus for keeping scanning means in place |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5914138A (en) * | 1982-07-14 | 1984-01-25 | Minolta Camera Co Ltd | Tracking control optical system of optical disk |
Also Published As
Publication number | Publication date |
---|---|
JPH0213374B2 (en) | 1990-04-04 |
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