JPH0476839A - Optical disk device - Google Patents

Optical disk device

Info

Publication number
JPH0476839A
JPH0476839A JP2191756A JP19175690A JPH0476839A JP H0476839 A JPH0476839 A JP H0476839A JP 2191756 A JP2191756 A JP 2191756A JP 19175690 A JP19175690 A JP 19175690A JP H0476839 A JPH0476839 A JP H0476839A
Authority
JP
Japan
Prior art keywords
reflected light
circuit
light quantity
head
optical disk
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
JP2191756A
Other languages
Japanese (ja)
Inventor
Kazuhiro Shimizu
和弘 清水
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.)
NEC Corp
Original Assignee
NEC Corp
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 NEC Corp filed Critical NEC Corp
Priority to JP2191756A priority Critical patent/JPH0476839A/en
Publication of JPH0476839A publication Critical patent/JPH0476839A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/121Protecting the head, e.g. against dust or impact with the record carrier

Abstract

PURPOSE:To clearly detect the dirt of a lens in an optical disk head by comparing initial reflected light quantity data, which is stored in a storage circuit, just after manufacturing the device or cleaning the lens with the reflected light quantity data from a mirror at a current time point. CONSTITUTION:A laser beam emitted from an optical disk head 2 is converged by the lens in the head 2 and reflected by a mirror 1. The reflected light beam returns to the head 2, and the reflected light quantity is converted to an actual light quantity signal (a) in the head 2. The signal (a) is read by a READ-AMP 7 of the reflected light quantity detection circuit 3 and converted to the reflected light quantity data by an A/D conversion circuit 8. The initial reflected light quantity data, which is detected by the circuit 3, just after manufacturing the device or cleaning the head is stored in a storage circuit 4. A comparator circuit 6 differentially compares the initial reflected light quantity data stored in the storage circuit 4 with the reflected light quantity data detected at the current time Point. Then, a differential signal is sent to a discrimination circuit 6, and the dirt is detected.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光ディスク装置に関し、特に、光ディスクヘ
ッドの汚れを検出する光ディスク装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disc device, and more particularly to an optical disc device that detects dirt on an optical disc head.

〔従来の技術〕[Conventional technology]

従来、この種の光ディスク装置は、光ディスクヘッドか
ら出射されるレーザ光をレンズて収束し、そのレーザ収
束光を光ディスク媒体面の記録膜に照射し、情報の記録
再生を行っている。このため、ホコリなどにより光ディ
スクヘッドのレンズが汚れると、光ディスクヘッドがら
出射されるレーザ収束光の拡散を招き、データ記録時に
は情報の記録品質が低下し、また、データ再生時には、
データ信号振幅の低下から再生誤りが発生ずる。
Conventionally, this type of optical disc device converges laser light emitted from an optical disc head using a lens, and irradiates the converged laser light onto a recording film on the surface of an optical disc medium to record and reproduce information. Therefore, if the lens of the optical disk head becomes dirty due to dust, etc., the laser convergence light emitted from the optical disk head will be diffused, and the recording quality of information will deteriorate when recording data, and when reproducing data,
Reproduction errors occur due to a decrease in data signal amplitude.

上述の如く、光ディスクヘッド内のレンズが汚れると情
報の記録、再生に悪影響が発生するため、汚れを検出す
る手段を兼ね備えていないものは、 (1)定期的に、光ティスフヘットのクリーニングを必
要とする。
As mentioned above, if the lens in the optical disk head becomes dirty, it will have a negative effect on recording and reproducing information, so if the lens does not have a means to detect dirt, (1) the optical disk head must be cleaned periodically. do.

また、汚れを検出する手段を兼ね備えているものは、 (2)光ディスク媒体の反射強度の初期値を光ディスク
媒体のある定められた一定領域に記録し、その反射強度
の初期値と、光ディスクヘッドから出射されるレーザ収
束光を光ディスク媒体の記録膜に照射したときの、反射
強度とを検出し、両者を比較することによって、その比
較値が、予め決めれなある所定レベル以下であるか否か
で汚れを検出している。
In addition, a device that also has a means for detecting dirt: (2) records the initial value of the reflection intensity of the optical disk medium in a certain fixed area of the optical disk medium, and records the initial value of the reflection intensity and the information from the optical disk head. By detecting the reflected intensity when the emitted laser convergent light is irradiated onto the recording film of the optical disc medium and comparing the two, it is possible to determine whether the comparison value is below a certain predetermined level that cannot be determined in advance. Detecting dirt.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

上述した従来の光ディスク装置は、(1)では、各々の
光ディスク装置の使用場所での環境条件により汚れの状
況が異なるため定期的なヘッドクリーニング間隔の設定
が難かしいという欠点がある。
The above-described conventional optical disk device has a drawback in (1) that it is difficult to set a regular head cleaning interval because the dirt status varies depending on the environmental conditions at the place where each optical disk device is used.

また、(2)では、光ディスク媒体からの反射光量を用
いて汚れを検出しているため、光ディスク媒体が汚れて
いたときも、光ディスクヘッドから出射されるレーザ収
束光が光ディスクの媒体面で拡散されてしまい、反射光
量は減少してしまう。
In addition, in (2), dirt is detected using the amount of light reflected from the optical disk medium, so even when the optical disk medium is dirty, the laser convergent light emitted from the optical disk head is not diffused on the optical disk medium surface. As a result, the amount of reflected light decreases.

従って、光ディスク媒体の反射強度の初期値である反射
率データと光ディスク媒体から実際に反射する反射光量
とを比較し、その比較結果から汚れを判別しても、光デ
ィスクヘッドのレンズが汚れている場合と同じ結果かえ
られるため、光ディスクヘッドのレンズ汚れであるか、
光ディスク媒体の汚れであるのか□を確定することがで
きないという欠点がある。
Therefore, even if the reflectance data, which is the initial value of the reflection intensity of the optical disk medium, is compared with the amount of reflected light actually reflected from the optical disk medium, and dirt is determined from the comparison result, if the lens of the optical disk head is dirty, Since the same result is obtained, it is possible that the lens of the optical disk head is dirty.
There is a drawback that it is not possible to determine whether the optical disk medium is dirty or not.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の光ディスク装置は、レーザ光源とレーザ光源か
ら出射されるレーザ光を収束しレーザ収束光を得るレン
ズとを備えた光ディスク装置において、所定反射率を有
するミラーと、レーザ収束光がミラーに反射した反射光
量を検出する反射光量検出回路と、ある決められた時点
での反射光量検出回路の反射光量データを記憶保持する
記憶回路と、反射光量検出回路の現時点ての反射光量デ
ータと記憶回路で記憶されている反射光量データとを比
較する比較回路と、比較回路での比較結果がある所定レ
ベルの許容範囲以内であるか否かを判別する判別回路と
を備えている。
An optical disc device of the present invention includes a laser light source and a lens that converges the laser light emitted from the laser light source to obtain a laser converged light. A reflected light amount detection circuit that detects the amount of reflected light reflected by the reflected light amount detection circuit, a memory circuit that stores and holds the reflected light amount data of the reflected light amount detection circuit at a certain point in time, and a storage circuit that stores and stores the reflected light amount data of the reflected light amount detection circuit at the present time. It includes a comparison circuit that compares the reflected light amount data stored in the memory, and a determination circuit that determines whether or not the comparison result of the comparison circuit is within a predetermined tolerance range.

〔実施例〕〔Example〕

本発明の実施例について図面に基づいて説明する。 Embodiments of the present invention will be described based on the drawings.

第1図は本発明の一実施例の光ディスク装置のブロック
図である。
FIG. 1 is a block diagram of an optical disc device according to an embodiment of the present invention.

第1図において、本実施例の光ディスク装置は、ミラー
1、光ディスクヘッド2、反射光量検出回路3、記憶回
路4、比較回路5、判別回路6で構成されている。
In FIG. 1, the optical disc device of this embodiment is comprised of a mirror 1, an optical disc head 2, a reflected light amount detection circuit 3, a storage circuit 4, a comparison circuit 5, and a discrimination circuit 6.

ここで、ミラー1は装置内部に設けられた所定反射率を
有するミラーで、光ディスクヘッド2はレーザ収束光を
出射するためのレーザダイオードとレーザ光を収束する
レンズとを有している。
Here, the mirror 1 is a mirror provided inside the device and has a predetermined reflectance, and the optical disk head 2 has a laser diode for emitting convergent laser light and a lens for converging the laser light.

反射光量検圧回路3は反射光量を検出するREAD−A
MP7と反射光量をA/D変換するA/D変換回路8と
で構成されている。
The reflected light amount detection circuit 3 is a READ-A that detects the amount of reflected light.
It is composed of an MP 7 and an A/D conversion circuit 8 that A/D converts the amount of reflected light.

記憶回路4は初期の反射光量データを記憶、保持するメ
モリーで、比較回路5はミラーの現時点での反射光量デ
ータと記憶回路4で記憶された反射光量データとを比較
する。
The storage circuit 4 is a memory that stores and holds initial reflected light amount data, and the comparison circuit 5 compares the current reflected light amount data of the mirror with the reflected light amount data stored in the storage circuit 4.

判別回路6は比較回路5の比較結果がある所定レベルの
許容範囲以内であるか否かを判別する。
The determination circuit 6 determines whether or not the comparison result of the comparison circuit 5 is within an allowable range of a certain predetermined level.

次に、本実施例の光ディスクヘッド2の汚れの検出方法
について第1図により説明する。
Next, a method for detecting dirt on the optical disk head 2 according to this embodiment will be explained with reference to FIG.

本実施例の検出方法は、光ディスクヘッド2から出射さ
れるレーザ光を光ディスクヘッド2内のレンズが収束し
、そのレーザ収束光がミラー1に反射する。その反射し
た反射光量が光ディスクヘッド2に戻り、戻ってきた反
射光量を、光ディスクヘッド2内部で実光量信号aに変
換する。
In the detection method of this embodiment, a lens within the optical disk head 2 converges a laser beam emitted from an optical disk head 2, and the converged laser beam is reflected by a mirror 1. The amount of reflected light returns to the optical disk head 2, and the returned reflected light amount is converted into an actual light amount signal a inside the optical disk head 2.

変換された実光量信号aは、反射光量検出回路3のRE
AD−AMP7で読取られて、A/D変換回路8で反射
光量データに変換される。
The converted actual light amount signal a is sent to the RE of the reflected light amount detection circuit 3.
The data is read by the AD-AMP 7 and converted into reflected light amount data by the A/D conversion circuit 8.

反射光量検出口s3で検出された装置製造直後もしくは
、ヘッドクリーニング直後の反射光量は、記憶回路4に
記憶される。
The amount of reflected light detected by the reflected light amount detection port s3 immediately after device manufacturing or immediately after head cleaning is stored in the storage circuit 4.

記憶回路4に記憶された初期の反射光量データと現時点
で検出された反射光量の反射光量データは、比較回路6
で差分比較される。比較された信号は、判別回路6に送
られて、判別回路6である所定レベルの許容範囲以内で
あるか否かを判別する。
The initial reflected light amount data stored in the storage circuit 4 and the reflected light amount data of the reflected light amount detected at the present time are stored in the comparison circuit 6.
The difference is compared. The compared signals are sent to the determination circuit 6, which determines whether or not the signals are within an allowable range of a predetermined level.

すなわち、本実施例は、光ディスクヘッド2から出射さ
れるレーザ光を光ディスクヘッド2内のレンズで収束し
、その収束したレーザ収束光をミラー1に出射し、ミラ
ー1で反射した現時点での反射光量を検出する。その検
出した反射光量データと記憶回路4に記憶された反射光
量データとを比較することで汚れを検出している。
That is, in this embodiment, the laser beam emitted from the optical disk head 2 is converged by a lens in the optical disk head 2, the converged laser beam is emitted to the mirror 1, and the current amount of reflected light reflected by the mirror 1 is Detect. Dirt is detected by comparing the detected reflected light amount data with the reflected light amount data stored in the storage circuit 4.

〔発明の効果〕〔Effect of the invention〕

以上説明したように本発明によれば、ミラーからの現時
点での反射光量データと記憶回路で記憶された装置製造
直後、もしくは、レンズクリーニング直後の初期の反射
光量データを比較することにより、明確に、光ディスク
ヘッド内のレンズ汚れを検出することができ、また、使
用場所の環境条件のことなりがあっても、光ディスクヘ
ットのレンズが汚れた時点で汚れていることを警告する
ため、警告後に、ヘッドのクリーニングをすることがで
きる。
As explained above, according to the present invention, by comparing the current reflected light amount data from the mirror with the initial reflected light amount data stored in the storage circuit immediately after device manufacturing or immediately after lens cleaning, it is possible to clearly determine the , it is possible to detect the lens dirt inside the optical disc head, and even if the environmental conditions of the place of use vary, the system will warn you that the lens of the optical disc head is dirty when it becomes dirty. The head can be cleaned.

これにより的確なレンズクリーニングの実施か可能で、
安定な記録、再生を行うことができるという効果がある
This allows for accurate lens cleaning.
This has the effect of allowing stable recording and playback.

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

第1図は本発明の一実施例の光ディスク装置のブロック
図である6 1・・・ミラー、2・・・光ディスクヘッド、3・・・
反射光量検出回路、4・・・記憶回路、5・・比較回路
、6・・・判別回路、7・・・REAI)−AMP、8
・・A/D変換回路、a・・・実光量信号。
FIG. 1 is a block diagram of an optical disk device according to an embodiment of the present invention. 6 1... Mirror, 2... Optical disk head, 3...
Reflected light amount detection circuit, 4... Memory circuit, 5... Comparison circuit, 6... Discrimination circuit, 7... REAI)-AMP, 8
... A/D conversion circuit, a... Actual light amount signal.

Claims (1)

【特許請求の範囲】  レーザ光源と前記レーザ光源から出射されるレーザ光
を収束しレーザ収束光を得るレンズとを備えた光ディス
ク装置において、 所定反射率を有するミラーと、 前記レーザ収束光が前記ミラーに反射した反射光量を検
出する反射光量検出回路と、 ある決められた時点での前記反射光量検出回路の反射光
量データを記憶保持する記憶回路と、前記反射光量検出
回路の現時点での反射光量データと前記記憶回路で記憶
されている反射光量データとを比較する比較回路と、 前記比較回路での比較結果がある所定レベルの許容範囲
以内であるか否かを判別する判別回路とを備えたことを
特徴とする光ディスク装置。
[Scope of Claim] An optical disc device comprising a laser light source and a lens that converges laser light emitted from the laser light source to obtain a laser convergence light, comprising: a mirror having a predetermined reflectance; and the laser convergence light is transmitted to the mirror. a reflected light amount detection circuit that detects the amount of reflected light reflected by the reflected light amount detection circuit; a storage circuit that stores and holds reflected light amount data of the reflected light amount detection circuit at a predetermined time; and a reflected light amount data of the reflected light amount detection circuit at the current time. and a determination circuit that determines whether or not the comparison result of the comparison circuit is within an allowable range of a certain predetermined level. An optical disc device characterized by:
JP2191756A 1990-07-19 1990-07-19 Optical disk device Pending JPH0476839A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2191756A JPH0476839A (en) 1990-07-19 1990-07-19 Optical disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2191756A JPH0476839A (en) 1990-07-19 1990-07-19 Optical disk device

Publications (1)

Publication Number Publication Date
JPH0476839A true JPH0476839A (en) 1992-03-11

Family

ID=16279984

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2191756A Pending JPH0476839A (en) 1990-07-19 1990-07-19 Optical disk device

Country Status (1)

Country Link
JP (1) JPH0476839A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6307832B1 (en) * 1999-05-04 2001-10-23 Terastor Corporation Optical storage system with head cleaning mechanism based on a position-controllable optical interfacing surface in an optical head

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6307832B1 (en) * 1999-05-04 2001-10-23 Terastor Corporation Optical storage system with head cleaning mechanism based on a position-controllable optical interfacing surface in an optical head
US6577575B2 (en) 1999-05-04 2003-06-10 Terastor Corporation Head cleaning in Optical disk drives

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