• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:

    公开号:NL1008996A1
    申请号:NL1008996
    申请日:1998-04-24
    公开日:1999-02-01
    发明作者:Byung-Ii Cho；Hyeong-Chang Hong
    申请人:Samsung Electronics Co Ltd；
    IPC主号:
    专利说明:

    Optical disc of the type which can be described once and read many times and method for its manufacture.
    The present invention relates to a recording medium and more particularly to an optical disc of the type that can be written once and read many times.
    Generally, recording media are classified into a semiconductor recording medium, a magnetic recording medium and an optical recording medium. As an optical recording medium there is the type that one can only read from which one can read data but on which one cannot write data, such as a CD-ROM (Compact Disk-Read OnlyMemory), a writable type on which one can write data, delete it and which data one can read, and a type that can be described once and read many times on which data can be written only once.
    As illustrated in Fig. 1, a conventional optical disc of the type which can be written once and read many times from a substrate 2 consists of a recording layer 4 of thin amorphous TeO 2-Te-Pd in which data are recorded, an adhesive layer 6 and a substrate 8 formed on the adhesive layer 6. Such an optical disc of the type which can be described once and read many times is disclosed in SPIE, volume 1499, Optical Data Storage, pp. 187-194, 1991, Shunji Ohara et al., Matsushita Electric Industrial Co. , Ltd.
    In operation, the optical disc has a low reflectivity since the recording layer 4 is in an amorphous state before data is recorded. When the disc for recording is irradiated with a laser beam, the recording layer 4 in the amorphous state is heated. Then the recording layer 4 gradually cools down and crystallizes out. In the crystallized state, the reflectivity of the recording layer 4 is increased by 7 to 9%. This means that data has been stored. That is, since there is a large difference in reflectivity, data can be accurately read.
    However, the recording layer 4 which is the thin amorphous TeO 2-Te-Pd layer has drawbacks as described below. First, the recording power of the laser during recording is high (12-13 mW). Therefore, in order to increase the recording density, a short wavelength laser should be used. However, the power of an industrial short-wave laser is very low. Second, the difference in reflectivity between an initial non-data bearing recording state and the state after recording the data is small. Third, since the melting point of a thin amorphous TeO2-Te-Pd layer is low, (about 600 ° C) the amorphous TeO2-Te-Pd layer shows an increasing tendency to crystallize over time, thus shortening the storage life of the recorded data . Fourth, the elements Te and Pd used for the recording layer 4 are expensive. Fifth, the element is too bad for the human body.
    The present invention therefore has for its object to provide an improved optical disc of the type which can be written once and read many times, and a method for the manufacture thereof.
    Another object of the present invention is to provide an optical disc of the type that can be written and read many times and a method of manufacture thereof which can accurately read out the recorded data and which requires a low laser power during recording.
    Yet another object of the present invention is to provide an optical disc of the type that can write once and read many times, and a method of manufacturing it that extends the storage life of recorded data and saves manufacturing costs of the disc.
    Yet another object of the present invention is to provide an optical disc of the type which can write once and read many times and a method of manufacturing the same in which the materials used are not harmful to the human body.
    According to the present invention, an optical disc which can be written once and read many times of the indicated type is provided, characterized in that this disc comprises an Fe-Zr-H recording layer formed on a substrate and an adhesive layer formed on the recording layer.
    According to the invention, there is further provided a method of manufacturing a once-write and read-type optical disk comprising the steps of the under-vacuum deposition of a thin Fe-Zr layer by a sputtering method on an optical disk substrate, injecting hydrogen into the Fe-Zr thin layer to form the Fe-Zr layer in a data-free low reflectivity state, and expelling the hydrogen from a predetermined portion of the substrate into which data is to be recorded by using a laser beam to form the Fe-Zr low-reflectivity high reflectivity state.
    The above and other objects, aspects and advantages of the present invention will become apparent from the following detailed description when taken in conjunction with the accompanying drawing in which the reference numerals represent like parts in the various images.
    In the drawing shows:
    Fig. 1 a structure of a conventional optical disc of the type that can be written once and read many times; FIG. 2 is a structure of an optical disc of the type that can be described once and read many times according to the present invention; FIG. 3 is a manufacturing method according to the present invention for an optical disc of the type that can be described once and read many times; FIG. 4 is a diagram for describing the method in which multi-layer stacking of a disk momentane is heated by a pulse laser source; and FIG. 5 is a graph showing the recording power for a recording power of an Fe-Zr-H disc when irradiated with a pulse laser.
    In the following description, known functions and structures obscuring the present invention in unnecessary detail are not described in detail.
    Referring to Fig. 2, there is a once-described and read-many-type optical disc of the present invention from a substrate 10, a recording layer 12 in which data is recorded, and an adhesive layer 14 formed on the recording layer 12. The recording layer 12 is a Fe-Zr-H layer with a thickness of about 300A which has been deposited in a vacuum using a sputtering method.
    A manufacturing method for the optical disc of the type that can be written once and read many times will now be described with reference to FIGS. 2 and 3.
    By vacuum deposition, a Fe-Zr layer is formed on the substrate 10 in a thickness of about 300A using a sputtering method. The value of the atomic percentage Zr is 50 to 93% and Fe covers the additional atomic percentage value. Therefore, the Fe-Zr thin layer is an amorphous alloy layer formed on the substrate 10. Hydrogen (H) is injected into the thin Fe-Zr layer (starting state). In more detail, when the thin Fe-Zr layer corresponding to a negative electrode is placed in a 0.5 molar H2S solution and a current of 500 to 900 mA per cm2 flows into the graphite which acts as positive electrode, 10 to 15 atomic% hydrogen is injected within about 1 to 10min. This is because Zr has the property of absorbing hydrogen. Since Fe-Zr is amorphous, more hydrogen atoms are injected into it than in the crystallized state. When the hydrogen is injected, the metal luster, that is, the reflectivity of the recording layer 12, is lowered from the state in which the hydrogen is not injected. When hydrogen is injected, the recording layer 12 with low reflectivity enters an initial state in which no data is recorded.
    Data is included in the Fe-Zr layer into which hydrogen is injected. I.e. data is recorded in deamorphic Fe-Zr-H recording layer 12.
    Fig. 4 shows the method in which the multilayer stacking of a disc is currently heated using a pulse laser source. Reference numeral 20 indicates a laser source and 22 indicates a pulse laser beam generated by the laser source 20. An arrow 24 indicates the direction of rotation of the disc when the disc is rotated through a spindle motor of an initializer. Reference numeral 26 indicates a laser beam spot when the laser beam 22 irradiates the Fe-Zr-H recording layer 12. Arrow 28 indicates the direction of rotation of beam spot 26. Although the beam spot 26 is stationary, since the disc is rotated, the rotational direction 28 of the beam spot 26 is opposite to the rotational direction 24 of the disc. A reference digit 10 indicates the substrate.
    Referring now to Figures 3 and 4, the method of recording data into the Fe-Zr-H recording layer 12 will now be described. When the pulse laser beam 22 irradiates and therefore the beam spot 28 is formed on the recording layer 12, the temperature of the recording layer 12 is increased. When the temperature of the recording layer 12 is approximately 200 ° C, a bond between the hydrogen atom and Zr is cut. Furthermore, since hydrogen has the smallest atomic number in the periodic table of the elements, it is easily drifted from atoms that form a Fe-Zr matrix. When the hydrogen is expelled, the recording layer 12 becomes an amorphous Fe-Zr layer with high reflectivity. In this way, the data is recorded in the recording layer 12.
    Fig. 5 shows the reflectivity for the recording power of the Fe-Zr-H disk when the pulse laser irradiates. Referring to Fig. 5, the difference in reflectivity before and after the data is recorded is nearly 20%. Namely, the reflectivity before recording is 70% while the reflectivity after recording is 90%. The required power consumption is about 6mW compared to 12 to 13mW for the conventional optical disc of the type that can be written once and read many times.
    As described above, the recording layer of the optical disc of the present invention has the following advantages. First, since the difference in reflectivity before and after the data has been recorded is about 20%, the recorded data can be read accurately. Second, the laser power during recording is low (about 6 mW). Third, since the melting point is above 1500 ° C, the material is stably incorporated and the data storage life is extended. Fourth, since Fe and Zr are low in cost, manufacturing costs are saved. Fifth, Fe and Zr are not harmful to the human body.
    While the invention has been shown and described with reference to a specific preferred embodiment thereof, it will be apparent to those skilled in the art that various changes of form and details can be made without departing from the spirit and scope of the invention as defined in the appended claims.
    权利要求:
    Claims (9)
    [1]
    An optical disc of the type which can be written once and read many times comprising: a thin FE-Zr-H recording layer (12) formed on a substrate (10); and an adhesive layer (14) formed on said recording layer.
    [2]
    The optical disk according to claim 1, wherein the Fe-Zr-H recording layer (12) has a thickness of about 3θθΑ.
    [3]
    The optical disk according to claim 2, wherein the Fe-Zr-H recording layer (12) is deposited in a vacuum using a sputtering method.
    [4]
    Optical disc according to claim 3, wherein the atomic percentage Zr is 50 to 93% and the remainder is Febestat.
    [5]
    A method of manufacturing an optical disc of the type which can be written once which can be read many times, comprising the steps of: depositing a thin Fe-Zr layer (12) on the substrate (10) under vacuum of an optical disc using a sputtering method; injecting hydrogen into the Fe-Zr thin layer (12) to bring the Fe-Zr layer (12) into a non-data-containing, low reflectivity state; and expelling hydrogen from a predetermined portion of the substrate (10) in which data is to be recorded using a laser beam to bring the Fe-Zr layer (12) into a data recording state of high reflectivity.
    [6]
    The method of claim 5 wherein the Fe-Zr thin layer (12) has a thickness of 300A.
    [7]
    The method of claim 6 wherein the atomic percentage Zr is 50 to 93% and the remainder is Fe.
    [8]
    The method of claim 5 wherein the step of injecting hydrogen comprises the steps of applying the thin Fe-Zr layer (12) corresponding to a negative electrode in a 0.5 molar H2S solution and applying a current of 500 to 900 mA / cm2 of graphite corresponding to a positive electrode.
    [9]
    9. A method according to claim 5 wherein the step of expelling hydrogen is carried out by increasing the temperature of the thin Fe-Zr layer (12) into which hydrogen is injected and a spot with a temperature of 200 'by said laser beam. C or higher is formed.
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    同族专利:
    公开号 | 公开日
    JPH1145465A|1999-02-16|
    CN1206910A|1999-02-03|
    JP2922889B2|1999-07-26|
    KR100229044B1|1999-11-01|
    NL1008996C2|1999-04-20|
    KR19990012347A|1999-02-25|
    US6066381A|2000-05-23|
    CN1153198C|2004-06-09|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US5176943A|1991-07-09|1993-01-05|Minnesota Mining And Manufacturing Company|Optical recording medium with antistatic hard coating|
    JP2661472B2|1992-06-30|1997-10-08|日本ビクター株式会社|Recording medium and its recording / reproducing method|
    US5557596A|1995-03-20|1996-09-17|Gibson; Gary|Ultra-high density storage device|US6804137B1|2003-06-12|2004-10-12|Hewlett-Packard Development Company, L.P.|Data storage medium having layers acting as transistor|
    US6937502B2|2003-07-10|2005-08-30|Hewlett-Packard Development Company, L.P.|Re-recordable data storage medium utilizing conduction barrier|
    法律状态:
    1999-04-01| RD2N| Patents in respect of which a decision has been taken or a report has been made (novelty report)|Effective date: 19990217 |
    1999-04-01| AD1B| A search report has been drawn up|
    1999-07-01| PD2B| A search report has been drawn up|
    2010-01-04| VD1| Lapsed due to non-payment of the annual fee|Effective date: 20091101 |
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019970035696A|KR100229044B1|1997-07-29|1997-07-29|Write once type optical dsic and manufacturing method therfor|
    KR19970035696|1997-07-29|
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