JPH03224180A - Information recorder - Google Patents
Information recorderInfo
- Publication number
- JPH03224180A JPH03224180A JP1947590A JP1947590A JPH03224180A JP H03224180 A JPH03224180 A JP H03224180A JP 1947590 A JP1947590 A JP 1947590A JP 1947590 A JP1947590 A JP 1947590A JP H03224180 A JPH03224180 A JP H03224180A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- recording
- reflected light
- recording medium
- 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
Links
- 230000007547 defect Effects 0.000 claims abstract description 14
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 12
- 230000008859 change Effects 0.000 abstract description 7
- 230000004069 differentiation Effects 0.000 abstract description 3
- 230000005856 abnormality Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 3
- 230000007723 transport mechanism Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
この発明は光学的に情報を記録する情報記録装置に係り
、詳しくは、情報記録時に媒体から反射される反射光を
検出して反射光により記録不良の有無を判別する情報記
録装置に関する。Detailed Description of the Invention (Industrial Field of Application) The present invention relates to an information recording device that optically records information, and more specifically, detects reflected light reflected from a medium during information recording and detects reflected light from a medium. The present invention relates to an information recording device that determines whether there is a recording defect.
(従来の技術)
従来の情報記録装置としては、特開昭61−13492
9号公報あるいは特開昭61−278149号公報等に
記載されたものが知られる。例えば、後者の特開昭61
−276149号公報に記載された記録装置は、垂直磁
化媒体に光ビームを照射して情報を記録するとともに、
この光ビームの垂直磁化媒体からの反射光を検光子で検
出して反射光の振幅に応じた電位の信号に変換し、この
信号の波形を基準信号の波形と比較して記録不良の有無
を判別する。(Prior art) As a conventional information recording device, Japanese Patent Application Laid-Open No. 61-13492
Those described in Publication No. 9 or Japanese Unexamined Patent Publication No. 61-278149 are known. For example, the latter JP-A-61
The recording device described in Japanese Patent No. 276149 records information by irradiating a perpendicularly magnetized medium with a light beam, and
The reflected light of this light beam from the perpendicularly magnetized medium is detected by an analyzer, converted into a signal with a potential corresponding to the amplitude of the reflected light, and the waveform of this signal is compared with the waveform of the reference signal to check for recording defects. Discern.
(発明が解決しようとする課題)
しかしながら、上述した特開昭61−276149号公
報の記録装置にあっては、反射光の振幅を表す信号の波
形と記録信号を波形成形して得られる基準信号とを比較
して記録不良の有無を判別するため、媒体の材質等が変
化して媒体の反射特性が変化すると反射光も大きく変化
し、この変化した反射光に応じて基準信号の波形も大き
く変えざるを得す、媒体の変更時には基準信号を生成す
る波形整形回路の交換等が不可欠で汎用性に乏しいどう
問題がある。特に、反射率の変化で情報を記録する記録
媒体にあっては反射率が変化すると信号の振幅も大きく
変化するため、上述の問題も顕著でその解決が要望され
ていた。(Problem to be Solved by the Invention) However, in the recording device of JP-A-61-276149 mentioned above, the reference signal obtained by waveform shaping the signal waveform representing the amplitude of the reflected light and the recording signal is In order to determine whether there is a recording defect by comparing the However, when changing the medium, it is necessary to replace the waveform shaping circuit that generates the reference signal, resulting in a lack of versatility. In particular, in the case of recording media that record information through changes in reflectance, the amplitude of the signal changes significantly when the reflectance changes, so the above-mentioned problem is also significant, and a solution to this problem has been desired.
この発明は、上記問題に鑑みてなされたもので、記録媒
体の変化等に対しても大幅な改変を必要としない情報記
録装置を提供し、大きな汎用性を得ることを目的とする
。The present invention has been made in view of the above-mentioned problems, and aims to provide an information recording device that does not require major modification even when the recording medium changes, and has great versatility.
(課題を解決するための手段)
この発明は、記録信号に基づき光ビームを記録媒体に照
射して記録媒体に情報を記録する情報記録装置において
、前記光ビームの前記記録媒体で反射した反射光を検出
して反射光に応じた検知信号を出力する反射光検知手段
と、この反射光検知手段が出力する検知信号を微分する
微分回路と、この微分回路が出力する信号を所定値と比
較してパルス信号を出力する比較回路と、この比較回路
が出力するパルス信号と前記記録信号との論理積を演算
する論理積演算回路と、この論理積演算回路の出力信号
と前記記録信号とを比較して記録不良の有無を判断する
判定回路と、を有することが要旨である。(Means for Solving the Problems) The present invention provides an information recording apparatus that records information on a recording medium by irradiating a light beam onto the recording medium based on a recording signal, in which reflected light of the light beam reflected by the recording medium a reflected light detection means for detecting the reflected light and outputting a detection signal corresponding to the reflected light; a differentiating circuit for differentiating the detection signal outputted by the reflected light detecting means; a comparator circuit that outputs a pulse signal, an AND operation circuit that calculates the AND of the pulse signal output by this comparison circuit and the recording signal, and a comparison between the output signal of the AND operation circuit and the recording signal. The gist is to have a determination circuit that determines whether or not there is a recording defect.
(作用)
この発明の情報記録装置は、記録媒体からの反射光に応
じた検知信号を微分し、この微分された信号を所定値と
比較して得られたパルス信号と記録信号との論理積を演
算し、この論理積と記録信号とを比較して異常の有無を
判定する。したがって、材質の変更等により媒体の反射
特性が変化して検知信号の振幅等が変化した場合にあっ
ても、微分信号が受ける影響は小さく、微分回路の時定
数の調整等で対処することができ、大きな汎用性を得ら
れる。(Function) The information recording device of the present invention differentiates a detection signal corresponding to reflected light from a recording medium, compares the differentiated signal with a predetermined value, and combines a pulse signal and a recording signal. is calculated, and this AND is compared with the recorded signal to determine whether there is an abnormality. Therefore, even if the amplitude of the detection signal changes due to a change in the reflection characteristics of the medium due to a change in material, etc., the effect on the differential signal is small, and this can be countered by adjusting the time constant of the differentiator circuit, etc. This gives you great versatility.
(実施例)
第1図において、11は記録媒体であり、記録媒体11
は光反射事変化型のいわゆる光ディスクから成る。記録
媒体11は、光ピツクアップ12から照射されるレーザ
ビームR(第2図参照)によってトラックに光反射率の
低いピットP(第2図参照)が形成され、光反射率の変
化で情報を記録する。(Example) In FIG. 1, 11 is a recording medium;
consists of a so-called optical disc of the light reflection type. In the recording medium 11, pits P (see Fig. 2) with low light reflectance are formed in the track by a laser beam R (see Fig. 2) irradiated from the optical pickup 12, and information is recorded by changes in the light reflectance. do.
光ピツクアップ12は、図中明示しないが、半導体レー
ザ等の発光素子、フォトダイオード等の受光素子および
コリメータレンズ等を有し、モータ等を有する移送機構
により記録媒体11の径方向に移動可能に支持されてい
る。この光ピツクアップ12は、発光素子がレーザ駆動
回路13に、受光素子がRF増幅回路14に、移送機構
のモータがサーボ回路15に接続され、発光素子がレー
ザビームRを記録媒体11に向けて発射して記録媒体1
1にビットPを形成し、受光素子が記録媒体11で反射
したレーザビームRの反射光を受光して電気信号に変換
し、移送機構がサーボ回路15により制御される。レー
ザビームRは、第2図に示すように、後述するレーザ駆
動回路13に入力する記録信号Wに対応して光量が変化
し、記録信号Wが高レベルを有する高レベル期間におい
て大きな光量を有しく大光量期間)、低レベルの低レベ
ル期間において小さな光量を有する。そして、記録媒体
11のビットPはレーザビームRの大光量期間に対して
時間遅れをもって形成され、ピットPの前後にはレーザ
ビームRの大光量期間に対してそれぞれ位相遅れτ1.
τ2がある。Although not shown clearly in the figure, the optical pickup 12 includes a light emitting element such as a semiconductor laser, a light receiving element such as a photodiode, a collimator lens, etc., and is supported so as to be movable in the radial direction of the recording medium 11 by a transport mechanism having a motor etc. has been done. In this optical pickup 12, a light emitting element is connected to a laser drive circuit 13, a light receiving element is connected to an RF amplifier circuit 14, a motor of a transport mechanism is connected to a servo circuit 15, and the light emitting element emits a laser beam R toward a recording medium 11. Recording medium 1
A bit P is formed in 1, the light receiving element receives the reflected light of the laser beam R reflected by the recording medium 11, and converts it into an electric signal, and the transport mechanism is controlled by the servo circuit 15. As shown in FIG. 2, the laser beam R changes in light intensity in response to a recording signal W input to a laser drive circuit 13, which will be described later, and has a large light intensity during a high-level period when the recording signal W is at a high level. It has a relatively high light intensity period) and a small light intensity during a low level period. The bit P of the recording medium 11 is formed with a time delay with respect to the period of high light intensity of the laser beam R, and before and after the pit P there is a phase delay τ1.
There is τ2.
レーザ駆動回路13は、情報を表すパルス信号(以下、
記録信号と称す)W(第2図参照)が人力し、この記録
信号Wに基づき発光素子を駆動する。第2図に明らかな
ように、このレーザ駆動回路13は記録信号Wの高レベ
ル期間にレーザビームRが大光量となるように光ピツク
アップ12を駆動する。RF増幅回路14は、受光素子
の出力信号を高周波増幅し、受光素子に入射する反射光
の光量に応じた反射光信号V(第2図参照)を微分回路
16へ出力する。このRF増幅回路14が出力する反射
光信号Vは、第2図の左手部の領域I1.:ホされるよ
うに、ピットPが正確に形成された場合ピットPの前方
近傍で極大値(正のピーク値)、後端で極少値(負のピ
ーク値)を有する波形を呈し、ピットPの前後で値が急
減する。なお、第2図においては正常であれば存在すべ
き信号およびピットを破線で示す。The laser drive circuit 13 generates a pulse signal representing information (hereinafter referred to as
W (referred to as a recording signal) (see FIG. 2) is manually input, and the light emitting element is driven based on this recording signal W. As is clear from FIG. 2, this laser drive circuit 13 drives the optical pickup 12 so that the laser beam R has a large amount of light during the high level period of the recording signal W. The RF amplifier circuit 14 performs high-frequency amplification on the output signal of the light receiving element and outputs a reflected light signal V (see FIG. 2) corresponding to the amount of reflected light incident on the light receiving element to the differentiating circuit 16. The reflected light signal V output from this RF amplifier circuit 14 is transmitted to the area I1. on the left side of FIG. : If the pit P is formed accurately, it will exhibit a waveform with a maximum value (positive peak value) near the front of the pit P and a minimum value (negative peak value) at the rear end, and the pit P The value decreases rapidly before and after. In FIG. 2, signals and pits that should exist under normal conditions are indicated by broken lines.
微分回路16は、時定数を調節可能に構成され、RF増
幅回路14が出力する反射光信号■を微分して第2図に
示す微分信号Vを比較回路17へ出力する。この微分回
路16が出力する微分信号Vは上述した反射光信号Vの
急減部分に対応してピットPの前後で負のピーク値を有
する。比較回路17は、微分回路16が出力する微分信
号※を所定値の信号Cと比較し、信号Cが微分信号Vよ
り大きい場合に高電位Hを有する矩形パルス信号Sをア
ンド回路18へ出力する。アンド回路18は、矩形パル
ス信号Sとともに前述した記録信号Wか人力し、これら
信号S、Wの論理積を演算してパルス信号Aを計数回路
19に出力する。The differentiating circuit 16 is configured such that its time constant can be adjusted, and differentiates the reflected light signal (2) output from the RF amplifier circuit 14 and outputs the differential signal V shown in FIG. 2 to the comparing circuit 17. The differential signal V output from the differential circuit 16 has a negative peak value before and after the pit P, corresponding to the sudden decrease portion of the reflected light signal V described above. The comparison circuit 17 compares the differential signal * outputted by the differentiating circuit 16 with a signal C having a predetermined value, and outputs a rectangular pulse signal S having a high potential H to the AND circuit 18 when the signal C is larger than the differential signal V. . The AND circuit 18 inputs the above-mentioned recording signal W together with the rectangular pulse signal S, calculates the logical product of these signals S and W, and outputs the pulse signal A to the counting circuit 19.
計数回路19は、アンド回路18が出力する矩形パルス
信号Aがダウン端子に、前述した記録信号Wがアップ端
子に入力し、矩形パルス信号Aのパルス数を減算、記録
信号Wのパルス数を加算する。後述するように、この計
数回路19の計数値は記録不良個所の個数を表す。The counting circuit 19 inputs the rectangular pulse signal A output from the AND circuit 18 to the down terminal and the above-mentioned recording signal W to the up terminal, subtracts the number of pulses of the rectangular pulse signal A, and adds the number of pulses of the recording signal W. do. As will be described later, the count value of this counting circuit 19 represents the number of recording defects.
なお、この実施例においては、光ピツクアップ12とR
F増幅回路14とが反射光検知手段に、アンド回路18
が論理積演算回路に、計数回路19が判定回路に相当す
る。In this embodiment, the optical pickup 12 and R
The F amplifier circuit 14 serves as the reflected light detection means, and the AND circuit 18 serves as the reflected light detection means.
corresponds to an AND operation circuit, and the counting circuit 19 corresponds to a determination circuit.
この実施例の情報記録装置は、記録媒体11を一定速度
で回転させ、記録信号Wに基づき光ピツクアップ12の
発光素子がレーザビームRを記録媒体11に照射してピ
ットPを形成し、また、記録媒体11で反射した反射光
を光ピツクアップ12の受光素子で受光して電気信号に
変換し、この電気信号がRF増幅回路14に入力して高
周波増幅される。The information recording device of this embodiment rotates the recording medium 11 at a constant speed, and the light emitting element of the optical pickup 12 irradiates the recording medium 11 with a laser beam R based on the recording signal W to form pits P. The reflected light reflected by the recording medium 11 is received by the light receiving element of the optical pickup 12 and converted into an electrical signal, and this electrical signal is input to the RF amplifier circuit 14 and amplified at high frequency.
ここで、記録が正常に行なわれた場合、すなわち記録媒
体11に記録信号Wのパルス幅と対応した規定のピット
が形成された場合、第2図の領域■に示すように、RF
増幅回路14はピットPの前後に正負のピーク値を有す
る波形の反射光信号■を出力するため、微分回路16が
ピットPの前後で負のピーク値を有する波形の微分信号
※を出力し、比較回路17が出力する信号Sは記録信号
Wの1周期において2つのパルスを発生して1つのパル
スが記録信号Wの高レベル期間内に生じる。したがって
、アンド回路18は記録信号Wと同一の周期のパルス信
号Aを出力し、アンド回路18が出力するパルス信号A
のパルス数と記録信号Wのパルス数とが等しくなるため
、計数回路19の計数値も零となり、この計数回路19
の出力信号から記録不良が無かフたことが判断される。Here, if the recording is performed normally, that is, if prescribed pits corresponding to the pulse width of the recording signal W are formed on the recording medium 11, the RF
Since the amplifier circuit 14 outputs a reflected light signal ■ having a waveform having positive and negative peak values before and after the pit P, the differentiating circuit 16 outputs a differential signal * having a waveform having negative peak values before and after the pit P, The signal S output by the comparator circuit 17 generates two pulses in one cycle of the recording signal W, and one pulse occurs during the high level period of the recording signal W. Therefore, the AND circuit 18 outputs the pulse signal A having the same period as the recording signal W, and the AND circuit 18 outputs the pulse signal A.
Since the number of pulses of the recording signal W becomes equal to the number of pulses of the recording signal W, the count value of the counting circuit 19 also becomes zero, and this counting circuit 19
It is determined from the output signal that there is no recording defect.
一方、レーザビームRが規定の光量を有するにもかかわ
らず、記録媒体11にピットPが形成されなかった場合
、すなわち記録不良が発生した場合、光ピツクアップ1
2の発光素子から記録媒体11に照射されたレーザビー
ムRは高い光反射率で反射されて受光素子に入射し、第
2図中の領域I+に示すように、RF増幅回路14が出
力する反射光信号Vは記録信号Wの波形と略同形を呈す
る。このため、微分回路16は記録信号Wの1周期にお
いて記録信号Wの低レベル期間で1パルスを発生する信
号■を出力し、アンド回路18の出力信号Aはパルスを
発生せず、記録信号Wのパルス数が記録不良の個数に対
応してアンド回路18のパルス数より大きくなり、計数
回路19の計数値が記録不良の個数を表す。すなわち、
計数回路19の計数値により記録不良が判別される。On the other hand, if the pit P is not formed on the recording medium 11 even though the laser beam R has a specified light intensity, that is, if a recording defect occurs, the optical pickup 1
The laser beam R irradiated onto the recording medium 11 from the light emitting element 2 is reflected with a high light reflectance and enters the light receiving element, and as shown in area I+ in FIG. The optical signal V has substantially the same waveform as the recording signal W. Therefore, the differentiating circuit 16 outputs a signal ■ that generates one pulse during the low level period of the recording signal W in one period of the recording signal W, and the output signal A of the AND circuit 18 does not generate a pulse, and the recording signal W The number of pulses of the AND circuit 18 corresponds to the number of recording defects, and the count value of the counting circuit 19 represents the number of recording defects. That is,
A recording failure is determined based on the count value of the counting circuit 19.
また同様に、第2図中の領域IIIに示すように、レー
ザビームRの光量が規定値より小さくピットPの一部が
欠落した不良を生じた場合、反射光の光量も少くなって
レーザビームRの高光量期間始期においてRF増幅回路
14の信号V波形も時間変化率が小さく、微分回路16
が出力する微分信号■も記録信号Wの1周期において記
録信号Wの低レベル期間で1パルスのみを生じるにすぎ
ない。このため、前述した記録不良が生じた場合と同様
に、アンド回路18が出力する信号Aは記録信号Wの1
周期においてパルスを有せず、計数回路19の計数値で
記録不良が判別される。Similarly, as shown in area III in FIG. 2, if the light intensity of the laser beam R is smaller than the specified value and a defect occurs in which a part of the pit P is missing, the amount of reflected light also decreases and the laser beam At the beginning of the high light intensity period of R, the time change rate of the signal V waveform of the RF amplifier circuit 14 is also small, and the differential circuit 16
The differential signal (2) outputted by the recording signal W also generates only one pulse during the low level period of the recording signal W in one period of the recording signal W. Therefore, as in the case where the recording failure described above occurs, the signal A output from the AND circuit 18 is 1 of the recording signal W.
There is no pulse in the cycle, and a recording failure is determined based on the count value of the counting circuit 19.
そして、この情報記録装置にあフては、反射特性が異な
る記録媒体11に情報を記録する場合にあっても、RF
増幅回路14の出力信号Vを微分回路16により微分し
、この微分回路16が出力する微分信号V、すなわち反
射光の時間的変化を基に反射光が正常か否かを判断する
ため、反射特性の変化にともなう反射光量の変化等によ
って受ける影響が少くなく、種々の記録媒体11の記録
不良の判別が微分回路16の時定数の調整等で対応でき
、高い汎用性を得られる。In this information recording device, even if information is recorded on the recording medium 11 having different reflection characteristics, the RF
The output signal V of the amplifier circuit 14 is differentiated by a differentiating circuit 16, and it is determined whether the reflected light is normal or not based on the differential signal V outputted by the differentiating circuit 16, that is, the temporal change in the reflected light. The influence of changes in the amount of reflected light due to changes in the amount of reflected light, etc. is not small, and recording defects of various recording media 11 can be determined by adjusting the time constant of the differentiating circuit 16, resulting in high versatility.
なお、上述した実施例では、アップ端子に記録信号W、
ダウン端子にアンド回路18の出力信号Aが人力するア
ップダウン式の計数回路19を例示するが、記録信号W
とアンド回路18の出力信号Aとをそれぞれ別個の計数
回路で計数し、これら計数回路の計数値を比較、例えば
除算して不良率を判別することも可能である。In addition, in the embodiment described above, the recording signal W,
An example of an up-down counting circuit 19 is shown in which the output signal A of the AND circuit 18 is manually input to the down terminal, but the recording signal W
It is also possible to count the output signal A of the AND circuit 18 by separate counting circuits, and compare, for example, divide, the counts of these counting circuits to determine the defective rate.
(発明の効果)
以上説明したように、この発明にかかる情報記録装置に
よれば、記録媒体の反射特性が変化した場合、すなわち
、反射特性が異なる記録媒体に情報を記録する場合にも
、微分回路の時定数の調整等で記録不良を判別でき、高
い汎用性を得られる。(Effects of the Invention) As explained above, according to the information recording device according to the present invention, even when the reflection characteristics of the recording medium change, that is, when recording information on recording media with different reflection characteristics, the differential Recording defects can be determined by adjusting the time constant of the circuit, etc., and high versatility can be achieved.
第1図および第2図はこの発明の一実施例にかかる情報
記録装置を示し、第1図がブロック図、第2図がタイミ
ングチャートである。
11・・・記録媒体、12・・・光ピツクアップ(反射
光検知手段)、14・・・RF増幅回路(反射光検知手
段)、16・・・微分回路、17・・・比較回路、18
・・・アンド回路(論理積演算回路)、19・・・計数
回路(判定回路)、A・・・パルス信号(論理積)、R
・・・レーザビーム、S・・・パルス信号、■・・・反
射光信号(検知信号)、■・・・微分信号、W・・・記
録信号。1 and 2 show an information recording device according to an embodiment of the present invention, with FIG. 1 being a block diagram and FIG. 2 being a timing chart. DESCRIPTION OF SYMBOLS 11... Recording medium, 12... Optical pickup (reflected light detection means), 14... RF amplification circuit (reflected light detection means), 16... Differentiation circuit, 17... Comparison circuit, 18
...AND circuit (logical product calculation circuit), 19...counting circuit (judgment circuit), A...pulse signal (logical product), R
... Laser beam, S... Pulse signal, ■... Reflected light signal (detection signal), ■... Differential signal, W... Recording signal.
Claims (1)
体に情報を記録する情報記録装置において、 前記光ビームの前記記録媒体で反射した反射光を検出し
て反射光に応じた検知信号を出力する反射光検知手段と
、 この反射光検知手段が出力する検知信号を微分する微分
回路と、 この微分回路が出力する信号を所定値と比較してパルス
信号を出力する比較回路と、 この比較回路が出力するパルス信号と前記記録信号との
論理積を演算する論理積演算回路と、この論理積演算回
路の出力信号と前記記録信号とを比較して記録不良の有
無を判断する判定回路と、 を有することを特徴とする情報記録装置。[Scope of Claims] An information recording device that records information on a recording medium by irradiating a light beam onto the recording medium based on a recording signal, which detects the reflected light of the light beam reflected by the recording medium and converts it into reflected light. a differentiating circuit for differentiating the detection signal output by the reflected light detecting means; and a comparison circuit for comparing the signal output by the differentiating circuit with a predetermined value and outputting a pulse signal. a circuit, an AND operation circuit that calculates the AND of the pulse signal outputted by the comparison circuit and the recording signal, and a logical AND operation circuit that compares the output signal of the AND operation circuit with the recording signal to determine whether or not there is a recording defect. An information recording device comprising: a determination circuit for making a determination;
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1947590A JPH03224180A (en) | 1990-01-30 | 1990-01-30 | Information recorder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1947590A JPH03224180A (en) | 1990-01-30 | 1990-01-30 | Information recorder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH03224180A true JPH03224180A (en) | 1991-10-03 |
Family
ID=12000358
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1947590A Pending JPH03224180A (en) | 1990-01-30 | 1990-01-30 | Information recorder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH03224180A (en) |
-
1990
- 1990-01-30 JP JP1947590A patent/JPH03224180A/en active Pending
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