JPS6186825U - - Google Patents

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Publication number
JPS6186825U
JPS6186825U JP17265884U JP17265884U JPS6186825U JP S6186825 U JPS6186825 U JP S6186825U JP 17265884 U JP17265884 U JP 17265884U JP 17265884 U JP17265884 U JP 17265884U JP S6186825 U JPS6186825 U JP S6186825U
Authority
JP
Japan
Prior art keywords
recording
disk
differential amplifier
pickup
light receiving
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
JP17265884U
Other languages
Japanese (ja)
Other versions
JPH0538437Y2 (en
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 filed Critical
Priority to JP1984172658U priority Critical patent/JPH0538437Y2/ja
Publication of JPS6186825U publication Critical patent/JPS6186825U/ja
Application granted granted Critical
Publication of JPH0538437Y2 publication Critical patent/JPH0538437Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)

Description

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

第１図は本考案の光学式デイスク記録再生装置
の回路図、第２図はデイスクが有る場合の従来の
デイスク検出装置の部分断面図、第３図はデイス
クが無い場合の従来のデイスク検出装置の部分断
面図である。 １……デイスク、２……ピツクアツプ、３，１
０……光源、４，１１，１２……受光素子、５…
…シエルタ、１３，１４，１８……抵抗、１５…
…差動増幅器、１６……イコライザ、１７……Ｐ
ＮＰトランジスタ、１９……電界効果トランジス
タ、２０……ダイオード、２１……比較器、２２
……基準電圧発生器。 Fig. 1 is a circuit diagram of the optical disk recording/reproducing device of the present invention, Fig. 2 is a partial sectional view of a conventional disk detection device with a disk, and Fig. 3 is a conventional disk detection device without a disk. FIG. 1...Disk, 2...Pickup, 3,1
0... Light source, 4, 11, 12... Light receiving element, 5...
...Sierta, 13,14,18...Resistance, 15...
...Differential amplifier, 16...Equalizer, 17...P
NP transistor, 19... Field effect transistor, 20... Diode, 21... Comparator, 22
...Reference voltage generator.

Claims (1)

【実用新案登録請求の範囲】 (1) デイスクにレーザ光等の記録再生用光を照
射して情報を記録再生する光学的ピツクアツプと
、該ピツクアツプに固定され、該デイスクに該記
録再生用光とは異なる検出用光を照射する光源と
、該ピツクアツプに固定され、該光源から該デイ
スクに照射され、反射された該検出用光を受光す
る２つの受光素子と、２つの該受光素子の出力の
差を得る差動増幅器と、該差動増幅器の出力に対
応して該ピツクアツプと該デイスクとの相対的傾
きを調整する調整手段と、２つの該受光素子のう
ち少なくとも一方の出力のレベルから該デイスク
の有無を検出する検出手段とを備えることを特徴
とする光学式デイスク記録再生装置。 (2) 該検出手段は該差動増幅器の出力のレベル
を検出し、その検出時において２つの該受光素子
の出力のうち一方は、該差動増幅器への入力が阻
止されることを特徴とする実用新案登録請求の範
囲第１項記載の光学式デイスク記録再生装置。 (3) 該検出手段による該差動増幅器の出力のレ
ベルの検出時においては、該調整手段による該ピ
ツクアツプと該デイスクとの相対的傾きの調整が
実質的に非動作状態とされることを特徴とする実
用新案登録請求の範囲第２項記載の光学式デイス
ク記録再生装置。 (4) 該検出手段は、該受光素子から該差動増幅
器に入力される入力信号のレベルを検出すること
を特徴とする実用新案登録請求の範囲第１項記載
の光学式デイスク記録再生装置。 (5) 該検出手段は、２つつの該受光素子の出力
の和のレベルを検出することを特徴とする実用新
案登録請求の範囲第４項記載の光学式デイスク記
録再生装置。[Claims for Utility Model Registration] (1) An optical pickup for recording and reproducing information by irradiating a recording and reproducing light such as a laser beam onto a disk, and an optical pickup that is fixed to the pickup and that emits the recording and reproducing light to the disk. consists of a light source that emits different detection lights, two light receiving elements that are fixed to the pickup and receive the detection light that is irradiated from the light source to the disk and reflected, and the output of the two light receiving elements. a differential amplifier for obtaining a difference; an adjusting means for adjusting the relative tilt of the pickup and the disk in accordance with the output of the differential amplifier; 1. An optical disk recording and reproducing device comprising: a detection means for detecting the presence or absence of a disk. (2) The detection means detects the level of the output of the differential amplifier, and at the time of detection, one of the outputs of the two light receiving elements is blocked from being input to the differential amplifier. An optical disk recording and reproducing apparatus according to claim 1 of the utility model registration claim. (3) When the detecting means detects the level of the output of the differential amplifier, adjustment of the relative tilt between the pickup and the disk by the adjusting means is substantially inactive. An optical disk recording and reproducing apparatus according to claim 2 of the utility model registration claim. (4) The optical disk recording and reproducing apparatus according to claim 1, wherein the detection means detects the level of an input signal input from the light receiving element to the differential amplifier. (5) The optical disk recording and reproducing apparatus according to claim 4, wherein the detecting means detects the level of the sum of the outputs of the two light receiving elements.
JP1984172658U 1984-11-14 1984-11-14 Expired - Lifetime JPH0538437Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1984172658U JPH0538437Y2 (en) 1984-11-14 1984-11-14

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1984172658U JPH0538437Y2 (en) 1984-11-14 1984-11-14

Publications (2)

Publication Number Publication Date
JPS6186825U true JPS6186825U (en) 1986-06-06
JPH0538437Y2 JPH0538437Y2 (en) 1993-09-29

Family

ID=30730321

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1984172658U Expired - Lifetime JPH0538437Y2 (en) 1984-11-14 1984-11-14

Country Status (1)

Country Link
JP (1) JPH0538437Y2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03224171A (en) * 1990-01-30 1991-10-03 Kenwood Corp Method for discriminating unclamped state of disk

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5730865U (en) * 1980-07-28 1982-02-18
JPS59140645A (en) * 1983-01-31 1984-08-13 Ricoh Co Ltd Optical recording and reproducing device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5534235A (en) * 1978-08-31 1980-03-10 Dainippon Toryo Co Ltd Coating composition

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5730865U (en) * 1980-07-28 1982-02-18
JPS59140645A (en) * 1983-01-31 1984-08-13 Ricoh Co Ltd Optical recording and reproducing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03224171A (en) * 1990-01-30 1991-10-03 Kenwood Corp Method for discriminating unclamped state of disk

Also Published As

Publication number Publication date
JPH0538437Y2 (en) 1993-09-29

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