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    • 5. 发明申请
    • SUBSTRATE, RECORDING MEDIUM INCLUDING THE SUBSTRATE, CARTRIDGE AND REPRODUCTION APPARATUS
    • 基板,记录介质,包括基板,盒和再现装置
    • WO1997005607A1
    • 1997-02-13
    • PCT/JP1996002157
    • 1996-07-31
    • HITACHI MAXELL, LTD.OHNUKI, SatoruOHTA, NorioSHIMAZAKI, KatsusukeYOSHIHIRO, MasafumiSUGIYAMA, ToshinoriOHNUKI, Takeshi
    • HITACHI MAXELL, LTD.
    • G11B07/24
    • G11B23/0316G11B11/1058G11B11/10584G11B23/0307
    • An optical head (67) and a magnetic head (65) for magnetooptical disk recording/reproduction are placed between sliders (66a to 66d) that serve to form narrow air gaps (68) between the heads and a disk. When air flows in directions tangential to tracks because of the rotation of a disk (61), the pressure in the air gaps increases, and the disk surface can be kept at a predetermined position so that the pressure in the vertical direction of the disk (61) becomes uniform. This construction is effective for a thin disk having a substrate thickness of not greater than 0.85 mm. A disk cartridge (101) effective for a thin disk includes a roller member (111) which engages with the disk periphery. Radial protuberances (157a and 157b) are formed on the inner surface of the cartridge so as to regulate the air flow between the cartridge and the disk surface. The disk substrate (10) accomodated in the cartridge is thicker in the periphery (12) than the recording region (14) to increase rigidity.
    • 用于磁光盘记录/再现的光学头(67)和磁头(65)被放置在用于在磁头和磁盘之间形成窄气隙(68)的滑块(66a至66d)之间。 当空气由于盘(61)的旋转而沿着与轨迹相切的方向流动时,气隙中的压力增加,并且盘表面可以保持在预定位置,使得盘的垂直方向上的压力 61)变得均匀。 该结构对于基板厚度不大于0.85mm的薄盘是有效的。 对于薄盘有效的盘盒(101)包括与盘周边啮合的辊构件(111)。 径向突起(157a和157b)形成在盒的内表面上,以便调节盒与盘表面之间的气流。 容纳在盒中的盘基板(10)在周边(12)中比记录区域(14)更厚,以增加刚性。
    • 6. 发明申请
    • REPRODUCING METHOD AND DEVICE FOR MAGNETO-OPTICAL RECORDING MEDIUM
    • 用于磁光记录介质的再现方法和装置
    • WO1998009283A1
    • 1998-03-05
    • PCT/JP1997002984
    • 1997-08-27
    • HITACHI MAXELL, LTD.SHIMAZAKI, KatsusukeIMAI, SusumuOHTA, NorioAWANO, HiroyukiYOSHIHIRO, MasafumiWATANABE, HitoshiTAKAO, Hiroki
    • HITACHI MAXELL, LTD.
    • G11B11/10
    • G11B11/10595G11B11/10513G11B11/10515G11B11/10528G11B11/10584G11B11/10593G11B20/00086G11B20/1217G11B2020/1275G11B2020/1298G11B2220/2525
    • A magnetic field H(x) or a reproducing beam L(x) of light whose intensity pattern is different is applied to the recording position of a magneto-optical recording medium, and different information corresponding to the patterns is read out of the same recording position. The function H(x) or L(x) is a password for obtaining the information. Only a person who knows the function can access the specific information recorded on the magneto-optical recording medium. The function H(x) or L(x) is a function such that the magnetic field intensity or the beam intensity is modulated with respect to the recording position (x) in such a manner that the information can be reproduced while magnetic domains are picked up from contiguous domains in the recording region at specific intervals. In addition to the security application, the information can be reproduced n times while a reproducing beam PL/PH, which is subjected to power modulation so as to apply a high power PH with a period n times the recording clock, is being projected to a specific magneto-optical recording medium such that magnetic domain expansion reproduction is possible, thereby improving the reproducing C/N significantly.
    • 将强度图案不同的光的磁场H(x)或再现光束L(x)施加到磁光记录介质的记录位置,并且从同一记录中读出与图案对应的不同信息 位置。 函数H(x)或L(x)是用于获取信息的密码。 只有知道该功能的人才可以访问记录在磁光记录介质上的特定信息。 函数H(x)或L(x)是这样的功能,使得磁场强度或光束强度相对于记录位置(x)被调制,使得可以在拾取磁畴时再现信息 从特定间隔的记录区域中的连续域开始。 除了安全应用之外,可以再次n次地再现信息,而将经过功率调制以便施加具有n倍于记录时钟的周期的高功率PH的再现光束PL / PH投影到 特定的磁光记录介质,使得磁畴扩展再现成为可能,从而显着提高再现C / N。
    • 8. 发明申请
    • MAGNETO-OPTIC RECORDING MEDIUM AND REPRODUCTION METHOD THEREOF
    • 磁光记录介质及其再生方法
    • WO1997022969A1
    • 1997-06-26
    • PCT/JP1996003716
    • 1996-12-20
    • HITACHI MAXELL, LTD.OHNUKI, SatoruOHTA, NorioSHIMAZAKI, KatsusukeYOSHIHIRO, MasafumiTAKAO, HirokiWATANABE, Hitoshi
    • HITACHI MAXELL, LTD.
    • G11B11/10
    • G11B11/10515G11B11/10584G11B11/10593
    • A magneto-optic recording medium (11) includes a second auxiliary magnetic film (4), a first auxiliary magnetic film (5) and a magneto-optic recording film (6) on a substrate (1). The auxiliary magnetic films (4 and 5) change from in-plane magnetization to vertical magnetization at critical temperatures TCR1 and TCR2. Since they have the relation TCR1 > TCR2, the magnetic domain transferred from the magneto-optic recording film (6) to the first auxiliary magnetic film (5) at the time of reproduction is expanded further greater in diameter and is transferred to the second auxiliary magnetic film (4) when the temperature profiles of the auxiliary magnetic films inside an optical spot are utilized. The magnetic domain of the magneto-optic recording film (6) can be expanded and transferred, too, by means of magnetostatic coupling by using a non-magnetic film (9) in place of the first auxiliary magnetic film (5). Pulse reproduction light subjected to power modulation in synchronism with a reproduction clock can be used at the time of reproduction. Even when a very small magnetic domain is recorded, the intensity of an amplified reproduction signal can be detected and excellent C/N can be obtained.
    • 磁光记录介质(11)在基板(1)上包括第二辅助磁膜(4),第一辅助磁膜(5)和磁光记录膜(6)。 在临界温度TCR1和TCR2,辅助磁膜(4和5)从面内磁化转变为垂直磁化。 由于它们具有关系TCR1> TCR2,所以在再现时从磁光记录膜(6)转移到第一辅助磁膜(5)的磁畴的直径进一步扩大并被转移到第二辅助 利用光斑内的辅助磁性膜的温度分布时的磁性膜(4)。 也可以通过使用非磁性膜(9)代替第一辅助磁性膜(5)的静磁耦合来扩展和转移磁光记录膜(6)的磁畴。 在再现时可以使用经受与再现时钟同步的功率调制的脉冲再现光。 即使记录非常小的磁畴,也可以检测出放大的再现信号的强度,可以获得优异的C / N。
    • 9. 发明申请
    • OPTICAL MARK READER FOR LATENT IMAGE MARK
    • 光学标记读取器用于图像标记
    • WO1994027242A1
    • 1994-11-24
    • PCT/JP1994000778
    • 1994-05-13
    • HITACHI MAXELL, LTD.NISHIDA, MasatoISHITUKA, TomoakiOSHIMA, Toshio
    • HITACHI MAXELL, LTD.
    • G06K07/00
    • G06K7/10594G06K7/12Y10S283/901
    • A high-reliability optical mark reader for a latent image mark capable of accurately reading code information of a latent image mark. The reader comprises a projector element (4) for projecting onto the surface of the latent image mark (15), which contains a fluorescent substance and has specified information, light having a wavelength for excitation of the fluorescent substance, and a light receiving element (8) for receiving fluorescence emitted from the surface of the latent image mark (15). A range where a latent image mark is readable is defined with an intersection of optical axes of the projector element and the light receiving element as a reference, and a crossing angle ( theta ) of the two optical axes is restricted to 40 DEG or less.
    • 一种用于能够精确地读取潜像标记的代码信息的潜像标记的高可靠性光标读取器。 读取器包括投影仪元件(4),用于投影到潜象标记(15)的表面上,该潜像标记(15)包含荧光物质并具有指定信息,具有用于激发荧光物质的波长的光和光接收元件 8)用于接收从潜像标记(15)的表面发射的荧光。 通过投影元件和受光元件的光轴的交点作为基准来定义潜像标记可读的范围,并且两个光轴的交叉角(θ)限制在40°以下。