JPS51147338A - Auto focussing method - Google Patents

Auto focussing method

Info

Publication number
JPS51147338A
JPS51147338A JP50070822A JP7082275A JPS51147338A JP S51147338 A JPS51147338 A JP S51147338A JP 50070822 A JP50070822 A JP 50070822A JP 7082275 A JP7082275 A JP 7082275A JP S51147338 A JPS51147338 A JP S51147338A
Authority
JP
Japan
Prior art keywords
auto
focussing method
auto focussing
laser
focussing
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
JP50070822A
Other languages
English (en)
Inventor
Toshimitsu Miyauchi
Yoshito Tsunoda
Takeshi 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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP50070822A priority Critical patent/JPS51147338A/ja
Publication of JPS51147338A publication Critical patent/JPS51147338A/ja
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Focusing (AREA)
JP50070822A 1975-06-13 1975-06-13 Auto focussing method Pending JPS51147338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP50070822A JPS51147338A (en) 1975-06-13 1975-06-13 Auto focussing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP50070822A JPS51147338A (en) 1975-06-13 1975-06-13 Auto focussing method

Publications (1)

Publication Number Publication Date
JPS51147338A true JPS51147338A (en) 1976-12-17

Family

ID=13442642

Family Applications (1)

Application Number Title Priority Date Filing Date
JP50070822A Pending JPS51147338A (en) 1975-06-13 1975-06-13 Auto focussing method

Country Status (1)

Country Link
JP (1) JPS51147338A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6318533A (ja) * 1986-07-09 1988-01-26 Hamamatsu Photonics Kk 光デイスクピツクアツプ用レンズ
JPH0346130A (ja) * 1989-07-14 1991-02-27 Matsushita Electric Ind Co Ltd 光記録再生装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6318533A (ja) * 1986-07-09 1988-01-26 Hamamatsu Photonics Kk 光デイスクピツクアツプ用レンズ
JPH0346130A (ja) * 1989-07-14 1991-02-27 Matsushita Electric Ind Co Ltd 光記録再生装置

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