JPS587229U - random access circuit - Google Patents

random access circuit

Info

Publication number
JPS587229U
JPS587229U JP10001681U JP10001681U JPS587229U JP S587229 U JPS587229 U JP S587229U JP 10001681 U JP10001681 U JP 10001681U JP 10001681 U JP10001681 U JP 10001681U JP S587229 U JPS587229 U JP S587229U
Authority
JP
Japan
Prior art keywords
access
mirror
random access
circuit
drives
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
Application number
JP10001681U
Other languages
Japanese (ja)
Other versions
JPS637979Y2 (en
Inventor
豊 田村
細川　義夫
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.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric 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 Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP10001681U priority Critical patent/JPS587229U/en
Publication of JPS587229U publication Critical patent/JPS587229U/en
Application granted granted Critical
Publication of JPS637979Y2 publication Critical patent/JPS637979Y2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Moving Of Head For Track Selection And Changing (AREA)
  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of drawings]

図は、本考案の一実施例を示す回路ブロック図を顕わす
。 主な図番の説明、１２・・・アクセスミス検出回路、１
３・・・タイミング変更回路。The figure reveals a circuit block diagram illustrating one embodiment of the present invention. Explanation of main figure numbers, 12...Access miss detection circuit, 1
3...Timing change circuit.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 指定フレーム番号と再生フレーム番号を比較し、その差
が所定範囲を外れているとき強制移送モードとなりピッ
クアップを所定範囲に強制移送せしめる様にピックアッ
プモータを所望期間駆動し、その差が所定範囲内にある
ときミラーアクセスモードとなりその差の値に応じ螺線
状記録トラックを所定のタイミングで飛越し乍ら指定位
置に一方向よりアクセスする様にトラッキングミラーを
駆動するランダムアクセス機構に於て、ミラーアクセス
時にミラーアクセス範囲を外れたことを検出するアクセ
スミス検出回路と、該検出出力により次のミラーアクセ
ス時に於ける飛越タイミングを変更するタイミング変更
回路とをそれぞれ配して成るランダムアクセス回路。The designated frame number and the playback frame number are compared, and when the difference is outside a predetermined range, the system enters forced transfer mode and drives the pickup motor for a desired period of time to forcibly transfer the pickup to the predetermined range. In a random access mechanism that drives a tracking mirror to access a specified position from one direction while skipping over a spiral recording track at a predetermined timing according to the value of the difference, the mirror access mode is activated. A random access circuit comprising an access miss detection circuit that detects when the mirror access range is exceeded, and a timing change circuit that changes the jumping timing in the next mirror access based on the detection output.
JP10001681U 1981-07-03 1981-07-03 random access circuit Granted JPS587229U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10001681U JPS587229U (en) 1981-07-03 1981-07-03 random access circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10001681U JPS587229U (en) 1981-07-03 1981-07-03 random access circuit

Publications (2)

Publication Number Publication Date
JPS587229U true JPS587229U (en) 1983-01-18
JPS637979Y2 JPS637979Y2 (en) 1988-03-09

Family

ID=29894727

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10001681U Granted JPS587229U (en) 1981-07-03 1981-07-03 random access circuit

Country Status (1)

Country Link
JP (1) JPS587229U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61237234A (en) * 1985-04-12 1986-10-22 Olympus Optical Co Ltd Optical information reproducing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61237234A (en) * 1985-04-12 1986-10-22 Olympus Optical Co Ltd Optical information reproducing device

Also Published As

Publication number Publication date
JPS637979Y2 (en) 1988-03-09

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