JPS56143545A - Optical reproducing device - Google Patents
Optical reproducing deviceInfo
- Publication number
- JPS56143545A JPS56143545A JP4544980A JP4544980A JPS56143545A JP S56143545 A JPS56143545 A JP S56143545A JP 4544980 A JP4544980 A JP 4544980A JP 4544980 A JP4544980 A JP 4544980A JP S56143545 A JPS56143545 A JP S56143545A
- Authority
- JP
- Japan
- Prior art keywords
- convex lens
- diffraction grating
- distance
- incident aperture
- tracking
- 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
Landscapes
- Mechanical Optical Scanning Systems (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
PURPOSE:To prevent a tracking light beam from deviating from the incident aperture of an objective lens in an optical reproducing device by properly setting the distance between a diffraction grating, convex lens and focal position of the convex lens at the exit side, and the incident sperture. CONSTITUTION:A light beam is projected upon disk 1 by way of diffraction grating 9, convex lens 7 and objective lens 12, but when the distance between diffraction grating 9 and convex lens 7 is denoted as (x), the focal length of convex lens 7 as (f), and the distance between focal plane point P of convex lens 7 as an imaginary light source at the exit side and incident aperture 28 of objective lens 12 as L, diffraction grating 9, convex lens 7 and incident aperture 28 are so arranged that (1/x)+[1/(L+f)]=1/f. Thus, light beams 5 and 6 for tracking never deviate from incident aperture 28, so that a failure in tracking detection due to the deviation does not occur.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4544980A JPS56143545A (en) | 1980-04-07 | 1980-04-07 | Optical reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4544980A JPS56143545A (en) | 1980-04-07 | 1980-04-07 | Optical reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS56143545A true JPS56143545A (en) | 1981-11-09 |
JPS6130326B2 JPS6130326B2 (en) | 1986-07-12 |
Family
ID=12719643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4544980A Granted JPS56143545A (en) | 1980-04-07 | 1980-04-07 | Optical reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS56143545A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62139220U (en) * | 1986-02-26 | 1987-09-02 |
-
1980
- 1980-04-07 JP JP4544980A patent/JPS56143545A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6130326B2 (en) | 1986-07-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JPS5647933A (en) | Optical signal head | |
JPS54143661A (en) | Recording optical system | |
GB1524587A (en) | Closed loop automatic focusing unit | |
AU538975B2 (en) | Focus detector | |
JPS56158319A (en) | Light projecting device | |
JPS5789731A (en) | Focusing screen | |
JPS56143545A (en) | Optical reproducing device | |
JPS6455746A (en) | Optical pickup device | |
JPS5746334A (en) | Optical information reproducer | |
JPS6486337A (en) | Hologram | |
JPS5683848A (en) | Focusing device | |
JPS5231622A (en) | Optical information reader | |
JPS57111838A (en) | Optical information reader | |
JPS57105832A (en) | Detector for optical position | |
JPS54116904A (en) | Optical information reader | |
JPS56165937A (en) | Optical recorder and reproducer | |
JPS56133704A (en) | Focus error detector | |
JPS5270851A (en) | Focal point adjusting system for rays | |
JPS54106206A (en) | Optical recorder | |
JPS5573079A (en) | Information recording-reproducing method | |
JPS54133105A (en) | Optical disposition in disc reader | |
JPS51134996A (en) | Laser-utilizing processing device | |
JPS5782815A (en) | Optical beam scanner | |
JPS53112079A (en) | Semiconductor laser device | |
JPS5319028A (en) | Automatic focusing device for cinecamera |