JPS641134A - Split type optical pickup - Google Patents

Split type optical pickup

Info

Publication number
JPS641134A
JPS641134A JP62303055A JP30305587A JPS641134A JP S641134 A JPS641134 A JP S641134A JP 62303055 A JP62303055 A JP 62303055A JP 30305587 A JP30305587 A JP 30305587A JP S641134 A JPS641134 A JP S641134A
Authority
JP
Japan
Prior art keywords
optical axis
deviation
reflected light
luminous quantity
constitution
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
JP62303055A
Other languages
Japanese (ja)
Other versions
JPH011134A (en
Inventor
Ikuo Maeda
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP62-303055A priority Critical patent/JPH011134A/en
Priority claimed from JP62-303055A external-priority patent/JPH011134A/en
Publication of JPS641134A publication Critical patent/JPS641134A/en
Publication of JPH011134A publication Critical patent/JPH011134A/en
Pending legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE: To attain simple constitution not requiring any position correcting mechanism corresponding to a detection mechanism and the detection mechanism itself detecting the deviation of optical axis by providing a light transmissivity to a reflecting face of a polarized prism and setting the reflectance of the reflecting face so that the ratio of the luminous quantity near the optical axis of the reflected light from the recording medium to the luminous quantity of the equivalent position of the reflected light from the roof mirror side is 1:2.
CONSTITUTION: The reflectance of the reflecting face of a polarized prism 14 provided in a moving optical system 11 is set so that the ratio of the luminous quantity near the optical axis of the reflected light 16 from the recording medium 10 to the luminous quantity of the equivalent position of the reflected light 16 from the roof mirrors 17, 18 is 1:2 to provide the light transmissivity and the two roof mirrors 17, 18 symmetrical with respect to the center of the optical axis are provided behind the polarized prism 14. Thus, even if the reflected optical axis of the feedback system is deviated with respect to the radiation optical axis due to the deviation of position and tilt or the like of the moving optical system 11, the roof mirror system acts like a compensation optical system canceling the fluctuation of the received light quantity of the detector due to the optical axis deviation and a detection signal without the effect of optical axis deviation is obtained. Thus, the constitution is simplified.
COPYRIGHT: (C)1989,JPO&Japio
JP62-303055A 1987-03-03 1987-11-30 Separate optical pickup Pending JPH011134A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62-303055A JPH011134A (en) 1987-03-03 1987-11-30 Separate optical pickup

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP4828887 1987-03-03
JP62-48288 1987-03-03
JP62-303055A JPH011134A (en) 1987-03-03 1987-11-30 Separate optical pickup

Publications (2)

Publication Number Publication Date
JPS641134A true JPS641134A (en) 1989-01-05
JPH011134A JPH011134A (en) 1989-01-05

Family

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