JPS5611630A - Information reproducing unit - Google Patents

Information reproducing unit

Info

Publication number
JPS5611630A
JPS5611630A JP8773679A JP8773679A JPS5611630A JP S5611630 A JPS5611630 A JP S5611630A JP 8773679 A JP8773679 A JP 8773679A JP 8773679 A JP8773679 A JP 8773679A JP S5611630 A JPS5611630 A JP S5611630A
Authority
JP
Japan
Prior art keywords
lens
recording medium
collecting
light
cylindrical
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
Application number
JP8773679A
Other languages
Japanese (ja)
Inventor
Keiichi Yoshizumi
Toshiro Kamogawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8773679A priority Critical patent/JPS5611630A/en
Publication of JPS5611630A publication Critical patent/JPS5611630A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To make compact the unit, by collecting the light of semiconductor laser on the recording medium via two cylindrical and collecting lenses, picking up the reflection light with the specified beam splitter and adjusting the distance between the collecting lens and the recording medium via the light detector.
CONSTITUTION: The beam of the semiconductor laser 1 is collected on the recording medium 9 via the coupling lens 2, cylindrical lens 3, polarized beam splitter 4, cylindrical lens 5, λ/4 plate 6, reflection plate 7, and converging lens 8. The reflection light passes through the collecting lens 8 and the direction of X-axis of parallel beam is focussed to the focus of the lens 5, and the Y direction beam is focussed to the focus of the cylindrical lens 10 via the beam splitter 4. The light detection means 11 is provided at the intermediate position, the output difference (a+c)-(b+d) of the detector paris opposed is taken as error signal, allowing to control the distance between the converging lens 8 and the recording medium 9 at constant. Thus, the unit can be made compact.
COPYRIGHT: (C)1981,JPO&Japio
JP8773679A 1979-07-10 1979-07-10 Information reproducing unit Pending JPS5611630A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8773679A JPS5611630A (en) 1979-07-10 1979-07-10 Information reproducing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8773679A JPS5611630A (en) 1979-07-10 1979-07-10 Information reproducing unit

Publications (1)

Publication Number Publication Date
JPS5611630A true JPS5611630A (en) 1981-02-05

Family

ID=13923200

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8773679A Pending JPS5611630A (en) 1979-07-10 1979-07-10 Information reproducing unit

Country Status (1)

Country Link
JP (1) JPS5611630A (en)

Similar Documents

Publication Publication Date Title
JPS5753832A (en) Method and device for recording of optical information
JPS5647933A (en) Optical signal head
JPS5753831A (en) Method and device for reproduction of optical information
JPS5752006A (en) Method and device for detecting focus
JPS5345506A (en) Information detecting apparatus
JPS5752005A (en) Focus detecting method
JPS5494007A (en) Pickup for disc recorder recorded optically with information
JPS55927A (en) Focus servo unit of optical information reader
JPS5766533A (en) Optical information reader
JPS57169947A (en) Magnetic optical head
JPS55125417A (en) Photodetector
JPS57149912A (en) Optical position detector
JPS5611630A (en) Information reproducing unit
JPS5746334A (en) Optical information reproducer
JPS54116904A (en) Optical information reader
JPS5661043A (en) Detector for focus
JPS573236A (en) Optical information reader
JPS56145532A (en) Optical information recording and reproducing device
JPS5629847A (en) Optical type information recording and reproducing unit
JPS618746A (en) Tracking error detector of optical disk device
JPS5532245A (en) Optical recorder and reproducing device
JPS5733443A (en) Focus detector
JPS5644126A (en) Optical signal head
JPS57103130A (en) Focus controlling method of optical information recorder and reproducer
JPS57127935A (en) Pickup device