公开(公告)号：JP2000248267A

公开(公告)日：2000-09-12

申请号：JP4907599

申请日：1999-02-25

Applicant: CANON KK

Inventor： OGURI NOBUAKI ,  OKAMURA YOSHIMASA ,  OSATO YOICHI

IPC: H05F1/02 ,  C09K3/16 ,  H01J9/24 ,  H01J29/87 ,  H01J31/12

Abstract: PROBLEM TO BE SOLVED: To prepare an electrification-reducing membrane capable of reducing undesirable influences on emitted electrons, hardly varying electric resistance, excellent in stability and reproducibility and useful for an image formation device, or the like, by making a nitride of both a transition metal and silicon, obtained under a specific condition, exist in the membrane. SOLUTION: This membrane is prepared by making a nitride of both a transition metal and silicon which is obtained by sputtering a target made of both at least one transition metal selected from the group consisting of Cr, Ti, Ta, Mo and W and silicon (or silicon nitride) exist in the membrane itself. The surface nitrification degree of silicon, i.e., the weight ratio of (silicon nitride/silicon) in the nitride is >=60%. It is preferable to produce an image formation device containing both emissive elements and image formation members in an envelope and a spacer containing an electrification-reducing membrane having 10 nm-1 μm thickness, 10-7×Va2-105 Ωm resistivity and

公开(公告)号：JP2000248266A

公开(公告)日：2000-09-12

申请号：JP4907499

申请日：1999-02-25

Applicant: CANON KK

Inventor： OGURI NOBUAKI ,  OKAMURA YOSHIMASA ,  OSATO YOICHI

IPC: H05F1/02 ,  C09K3/16 ,  H01J9/24 ,  H01J29/87 ,  H01J31/12

Abstract: PROBLEM TO BE SOLVED: To prepare an electrification-reducing membrane capable of reducing electrification in a container housing emissive elements, hardly varying electric resistance e.g. even in an oxygen atmosphere, excellent in stability and reproducibility and useful for an image formation device, or the like by, making a nitride of both a specific transition metal and boron exist in the membrane. SOLUTION: This membrane is prepared by making a nitride (preferably having 1,000-3,000 Å thickness of both a transition metal and boron which is obtained by sputtering a target made of both at least one transition metal selected from the group consisting of Cr, Ti, Ta, Mo and W and boron nitride exist in the membrane itself. The surface nitrification degree of boron, i.e., the weight ratio of (boron nitride/boron) in the nitride of both the transition metal and boron is >=60%. It is preferable to produce an image formation device containing both emissive elements and image formation members in an envelope and a spacer containing an electrification-reducing membrane having 10 nm-1 μm thickness, 10-7×Va2-105 Ωm resistivity and

公开(公告)号：JPH07320313A

公开(公告)日：1995-12-08

申请号：JP11239394

申请日：1994-05-26

Applicant: CANON KK

Inventor： OSATO YOICHI ,  YOSHIDA YUTAKA

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To erase a recording bit at a high rate with substantially the same energy as the recording energy by a method for forming an interfacial magnetic domain wall in the erased state using a magneto-optical recording medium satisfying specific conditions. CONSTITUTION:First and second magnetic layers 2, 3 are laminated on a translucent substrate 1 to produce a magneto-optical recording medium satisfying the following conditions. H1>(sigmaw12/2Ms1h1, H2>sigmaw12/2Ms2h2, H1>H2 (where, T1, h1, H1, Ms1 and T2, ha, H2, Ms2 represent Curie point, film thickness, coercive force at room temperature, and saturation magnetization, respectively, for the first and second magnetic layers 2, 3). The magneto-optical recording medium is subjected to a field sufficient for magnetizing the second magnetic layer 3 in one direction at a position different from a recording head without altering the magnetized state of the first magnetic layer 2 before being irradiated with a laser beam for elevating the temperature close to the Curie point of the first magnetic layer 2. The record is erased while setting the magnitude and the direction of bias field such that an interfacial magnetic domain wall is formed between the layers 2, 3 without altering the magnetizing direction of the second magnetic layer 3.

公开(公告)号：JPH0528553A

公开(公告)日：1993-02-05

申请号：JP18104791

申请日：1991-07-22

Applicant: CANON KK

Inventor： OSATO YOICHI

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To improve the coercive force and perpendicular magnetic anisotropy of the artificial lattice films of the magneto-optical recording medium formed with the artificial lattice films of an iron family-platinum group system as a recording layer. CONSTITUTION:The artificial lattice films constituted by using the laminate laminated with a 1st layer 2 consisting of the metals selected from Co, Fe and Co-Fe alloy and a 2nd layer 3 consisting of the metal selected from Pt, Pd and Pt-Pd alloy as a repetitive unit 4 are formed on a substrate 1 consisting of a suitable material, such as glass or plastic. The artificial lattice films are formed in a gaseous atmosphere contg. elements (for example, O, N, H, C, S, F) which can decrease the saturation magnetization of the 1st layer 2.

公开(公告)号：JPH0528552A

公开(公告)日：1993-02-05

申请号：JP18104691

申请日：1991-07-22

Applicant: CANON KK

Inventor： OSATO YOICHI

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To improve the coercive force and perpendicular magnetic anisotropy of the artificial lattice films of the magneto-optical recording medium consisting of the artificial lattice films. CONSTITUTION:The artificial lattice films constituted by using the laminate successively laminated with a 1st Co layer 2 consisting of Co, a platinum group layer 3 consisting of the metal selected from Pt, Pd and Pt-Pd alloy, a 2nd Co layer 4 consisting of Co, and a rare earth layer 5 as a basic unit 6 and repetitively laminating the basic units 6 are used as the recording layer of the magneto-optical recording medium. The rare earth layer 5 consists of at least >=1 kinds of the elements selected from Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, and Er.

公开(公告)号：JPH04142007A

公开(公告)日：1992-05-15

申请号：JP26534190

申请日：1990-10-02

Applicant: CANON KK

Inventor： OSATO YOICHI

IPC: C23C14/35 ,  C23C14/14 ,  G11B11/10 ,  G11B11/105 ,  H01F10/12

Abstract: PURPOSE:To increase the Kerr rotation angle against readout light having a short wavelength and improve the S/N at the time of reproducing information by forming a recording layer by alternately piling up thin films of an alloy of rare earth metals and transition metals and thin films of an element having an absorption end at in a wavelength region of 100-1000nm. CONSTITUTION:This magnetic recording layer is formed by alternately piling up two or more first thin film layers 21-2n having a composition expressed by RxT1-x and two or more second thin film layers 31-3n having a composition expressed by NyM1-y to satisfy Expressions I and II (where, the R, T, M, and N respectively represents one or more elements selected out of Gd, Tb, Dy, Ho, and Nd, Fe, Co, and Ni, Ze, Nb, In, Sn, Sb, Ta, and W, and one or more elements other than the elements represented by the R, T, and M having an absorption end in a wavelength range of 100-1,000nm when the elements are formed to a thin film). Therefore, a large Kerr rotation angle can be obtained against light having a short wave-length and information reproduction can be performed at a high S/N.

公开(公告)号：JPH02156450A

公开(公告)日：1990-06-15

申请号：JP30880888

申请日：1988-12-08

Applicant: CANON KK

Inventor： OSATO YOICHI

IPC: G11B11/10 ,  G11B5/02 ,  G11B11/105

Abstract: PURPOSE:To enable the stabilized recording by impressing a magnetic field having such an intensity distribution that a distant part is higher than a part irradiated with a light beam on a medium, where the former is away from the latter and its vicinity along the traveling direction of the light beam. CONSTITUTION:A permanent magnet 13 is provided behind a center protrusion part 12a in the disk moving direction D. Then, this permanent magnet 13 is formed in such a wedge shape that the farther backward the thicker in thickness. These protrusion part 12a and magnet 13 are wound with a coil 14. At the time of recording information, the coil 14 is electrified, and the magnetic field is impressed on the disk 1 by a magnetic field generating device 11. In this case, the magnetic field to be generated has the strongest intensity around the magnet 13. Consequently, magnetic field intensity on the disk 1 is distributed in such a fashion that its position P1 apart from the position P0 irradiated with the beam is higher than the latter along the scanning direction of the light beam. By the magnetic field in this position P1, a 2nd magnetic layer of the disk is initialized. Then, the dual write of information is feasible.

公开(公告)号：JPH01146145A

公开(公告)日：1989-06-08

申请号：JP30442887

申请日：1987-12-03

Applicant: CANON KK

Inventor： OSATO YOICHI

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To compatibly obtain large coercive force and low recording noise characteristics by forming a magnetic recording layer consisting of an alloy of a rare earth and transition metal in the state of having a part modulated on compsn. in such a manner that the coercive force is >=5kOe and the magnetization increases in the film thickness direction. CONSTITUTION:The magnetic recording layer 2 which has =5kOe coercive force and to have the magnetization increasing in the thickness direction and a reflecting layer 3 are laminated on a transparent substrate 1. The magnetic reversal at the time of recording, therefore, arises from the part modulated in the compsn. so as to increase the saturation magnetic field and since the diamagnetic field to assist the magnetic reversal at the time of recording increases, the recording pits having the high contrast from the unrecorded part are formed. The magneto-optical recording medium of the low noises at the time of recording is thus obtd. by using the magnetic recording layer having the large coercive force.

公开(公告)号：JPS63237237A

公开(公告)日：1988-10-03

申请号：JP7027487

申请日：1987-03-26

Applicant: CANON KK

Inventor： OSATO YOICHI

IPC: G11B5/02 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To permit over writing with a magneto-optical recording medium having perpendicularly magnetized films consisting of magnetic layers having two-layered structure by maintaining the coercive force, magnetic wall energy, etc. of the respective layers at a specific relation. CONSTITUTION:A bit (c) does not make a change and indicates a state (e) when a magneto-optical disk 35 is rotated and the prerecording bits (c), (d) having the two- layered structure passes a magnetic field generating part 34. On the other hand, the bit (d) attains a state (f) as the magnetic layer 3 causes a magnetization inversion. The relation of equation I is required with the magnetic wall energy sigmaw of the magnetic layer 3 in order for the state (f) of the recording bit to exist stably. The conditions of equation II are further required in order to obtain good recording sensitivity and reproduction signal by optimizing the magneto-optical effect at the time of reproduction. In equations, H1, H2 are the coercive forces of the magnetic layers 2, 3; Ms is the saturation magnetization of the magnetic layer 2; L2 is the film thickness thereof; and L1 is the film thickness of the magnetic layer 1. The states (e) and (f) of the recording bit are controlled by the power of the laser at the time of recording and do not depend on the state before the recording and, therefore, the over writing is permitted.

公开(公告)号：JPS63224054A

公开(公告)日：1988-09-19

申请号：JP5671987

申请日：1987-03-13

Applicant: CANON KK

Inventor： OSATO YOICHI

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To enable satisfactory overwriting by forming a magnetic layer having a specified two-layered structure, incorporating a nonmagnetic element into the second magnetic layer so as to reduce exchange force applied to the second magnetic layer and using the resulting magneto-optical recording medium. CONSTITUTION:A perpendicularly magnetizable film having a two-layered struc ture subjected to exchange coupling is formed on a substrate 1 to obtain a magneto-optical recording medium. The film consists of a first magnetic layer 2 having a low Curie point TL and high coercive force HH and a second mag netic layer 3 having a higher Curie point TH and lower coercive force HL than the layer 2 and satisfies inequality I (where Ms is the saturation magnetization of the layer 3, (h) is the thickness of the layer 3 and sigmaw is the domain wall energy between the layers 2, 3). Each of the layers 2, 3 contains an amorphous alloy of a rare earth element and transition metal as the principal component. The layer 3 is formed by simultaneously vapor-depositing a rare earth element- transition metal material and a nonmagnetic element material from separately positioned evaporating sources. When the recording medium is used, satisfactory overwriting is enabled.