Abstract

A compact magnetooptical disk having 500 times the capacity of a 13.34-cm (5.25-in.) floppy disk has been developed for use in coded data storage applications. Low error rates are attained by the use of advanced highly sensitive polarization detection optics and high-quality recording media. Progress in these fields has been based on noise analysis of readout signals. The disk drive can write and erase data by sectors and can also play current write-once-type optical disks. This disk/disk drive unit promises to lead to enhanced storage capacity and to support the current drive to enhance office automation and other information systems.

© 1986 Optical Society of America

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References

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  1. Honeywell, U.S. Patent3368209 (22Oct.1964).
  2. P. Chaudhari, J. J. Cuomo, R. J. Gambino, “Amorphous Metallic Films for Bubble Domain Applications,” IBM J. Res. Dev. 17, 66 (1973).
    [CrossRef]
  3. N. Imamura, C. Ota, “Experimental Study on Magneto-Optical Disk Exerciser with the Laser Diode and Amorphous Magnetic Thin Films,” Jpn. J. Appl. Phys. 19, L731 (1980).
    [CrossRef]
  4. Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).
  5. K. Ohta, A. Takahashi, T. Deguchi, T. Hyuga, S. Kobayashi, H. Yamaoka, “Magneto Optical Disk with Reflecting Layers,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 252 (1983).
  6. K. Horita, S. Kubo, K. Takahashi, “Design of Junction FET for Video Camera,” Telev. Eng. Jpn. TEBS74-1, 1 (1980).
  7. M. Ojima, A. Arimoto, N. Chinone, T. Goto, K. Aiki, “Diode Laser Noise at Video Frequencies in Video Disk Players,” Appl. Opt.25, (1986), to be published.
    [CrossRef] [PubMed]
  8. F. Tanaka, Y. Nagao, N. Imamura, “Dynamic Read/Write Characteristics of Magneto-Optical TbFeCo and DyFeCo Disk,” IEEE Trans. Magn. MAG-20, 1033 (1984).
    [CrossRef]

1984 (1)

F. Tanaka, Y. Nagao, N. Imamura, “Dynamic Read/Write Characteristics of Magneto-Optical TbFeCo and DyFeCo Disk,” IEEE Trans. Magn. MAG-20, 1033 (1984).
[CrossRef]

1983 (2)

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

K. Ohta, A. Takahashi, T. Deguchi, T. Hyuga, S. Kobayashi, H. Yamaoka, “Magneto Optical Disk with Reflecting Layers,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 252 (1983).

1980 (2)

K. Horita, S. Kubo, K. Takahashi, “Design of Junction FET for Video Camera,” Telev. Eng. Jpn. TEBS74-1, 1 (1980).

N. Imamura, C. Ota, “Experimental Study on Magneto-Optical Disk Exerciser with the Laser Diode and Amorphous Magnetic Thin Films,” Jpn. J. Appl. Phys. 19, L731 (1980).
[CrossRef]

1973 (1)

P. Chaudhari, J. J. Cuomo, R. J. Gambino, “Amorphous Metallic Films for Bubble Domain Applications,” IBM J. Res. Dev. 17, 66 (1973).
[CrossRef]

Aiki, K.

M. Ojima, A. Arimoto, N. Chinone, T. Goto, K. Aiki, “Diode Laser Noise at Video Frequencies in Video Disk Players,” Appl. Opt.25, (1986), to be published.
[CrossRef] [PubMed]

Arimoto, A.

M. Ojima, A. Arimoto, N. Chinone, T. Goto, K. Aiki, “Diode Laser Noise at Video Frequencies in Video Disk Players,” Appl. Opt.25, (1986), to be published.
[CrossRef] [PubMed]

Chaudhari, P.

P. Chaudhari, J. J. Cuomo, R. J. Gambino, “Amorphous Metallic Films for Bubble Domain Applications,” IBM J. Res. Dev. 17, 66 (1973).
[CrossRef]

Chinone, N.

M. Ojima, A. Arimoto, N. Chinone, T. Goto, K. Aiki, “Diode Laser Noise at Video Frequencies in Video Disk Players,” Appl. Opt.25, (1986), to be published.
[CrossRef] [PubMed]

Cuomo, J. J.

P. Chaudhari, J. J. Cuomo, R. J. Gambino, “Amorphous Metallic Films for Bubble Domain Applications,” IBM J. Res. Dev. 17, 66 (1973).
[CrossRef]

Deguchi, T.

K. Ohta, A. Takahashi, T. Deguchi, T. Hyuga, S. Kobayashi, H. Yamaoka, “Magneto Optical Disk with Reflecting Layers,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 252 (1983).

Gambino, R. J.

P. Chaudhari, J. J. Cuomo, R. J. Gambino, “Amorphous Metallic Films for Bubble Domain Applications,” IBM J. Res. Dev. 17, 66 (1973).
[CrossRef]

Goto, T.

M. Ojima, A. Arimoto, N. Chinone, T. Goto, K. Aiki, “Diode Laser Noise at Video Frequencies in Video Disk Players,” Appl. Opt.25, (1986), to be published.
[CrossRef] [PubMed]

Horigome, S.

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

Horita, K.

K. Horita, S. Kubo, K. Takahashi, “Design of Junction FET for Video Camera,” Telev. Eng. Jpn. TEBS74-1, 1 (1980).

Hyuga, T.

K. Ohta, A. Takahashi, T. Deguchi, T. Hyuga, S. Kobayashi, H. Yamaoka, “Magneto Optical Disk with Reflecting Layers,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 252 (1983).

Imamura, N.

F. Tanaka, Y. Nagao, N. Imamura, “Dynamic Read/Write Characteristics of Magneto-Optical TbFeCo and DyFeCo Disk,” IEEE Trans. Magn. MAG-20, 1033 (1984).
[CrossRef]

N. Imamura, C. Ota, “Experimental Study on Magneto-Optical Disk Exerciser with the Laser Diode and Amorphous Magnetic Thin Films,” Jpn. J. Appl. Phys. 19, L731 (1980).
[CrossRef]

Kobayashi, S.

K. Ohta, A. Takahashi, T. Deguchi, T. Hyuga, S. Kobayashi, H. Yamaoka, “Magneto Optical Disk with Reflecting Layers,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 252 (1983).

Kubo, S.

K. Horita, S. Kubo, K. Takahashi, “Design of Junction FET for Video Camera,” Telev. Eng. Jpn. TEBS74-1, 1 (1980).

Nagao, Y.

F. Tanaka, Y. Nagao, N. Imamura, “Dynamic Read/Write Characteristics of Magneto-Optical TbFeCo and DyFeCo Disk,” IEEE Trans. Magn. MAG-20, 1033 (1984).
[CrossRef]

Ohta, K.

K. Ohta, A. Takahashi, T. Deguchi, T. Hyuga, S. Kobayashi, H. Yamaoka, “Magneto Optical Disk with Reflecting Layers,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 252 (1983).

Ojima, M.

M. Ojima, A. Arimoto, N. Chinone, T. Goto, K. Aiki, “Diode Laser Noise at Video Frequencies in Video Disk Players,” Appl. Opt.25, (1986), to be published.
[CrossRef] [PubMed]

Ota, C.

N. Imamura, C. Ota, “Experimental Study on Magneto-Optical Disk Exerciser with the Laser Diode and Amorphous Magnetic Thin Films,” Jpn. J. Appl. Phys. 19, L731 (1980).
[CrossRef]

Takahashi, A.

K. Ohta, A. Takahashi, T. Deguchi, T. Hyuga, S. Kobayashi, H. Yamaoka, “Magneto Optical Disk with Reflecting Layers,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 252 (1983).

Takahashi, K.

K. Horita, S. Kubo, K. Takahashi, “Design of Junction FET for Video Camera,” Telev. Eng. Jpn. TEBS74-1, 1 (1980).

Tanaka, F.

F. Tanaka, Y. Nagao, N. Imamura, “Dynamic Read/Write Characteristics of Magneto-Optical TbFeCo and DyFeCo Disk,” IEEE Trans. Magn. MAG-20, 1033 (1984).
[CrossRef]

Tsunoda, Y.

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

Tsutsumi, Z.

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

Yamaoka, H.

K. Ohta, A. Takahashi, T. Deguchi, T. Hyuga, S. Kobayashi, H. Yamaoka, “Magneto Optical Disk with Reflecting Layers,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 252 (1983).

IBM J. Res. Dev. (1)

P. Chaudhari, J. J. Cuomo, R. J. Gambino, “Amorphous Metallic Films for Bubble Domain Applications,” IBM J. Res. Dev. 17, 66 (1973).
[CrossRef]

IEEE Trans. Magn. (1)

F. Tanaka, Y. Nagao, N. Imamura, “Dynamic Read/Write Characteristics of Magneto-Optical TbFeCo and DyFeCo Disk,” IEEE Trans. Magn. MAG-20, 1033 (1984).
[CrossRef]

Jpn. J. Appl. Phys. (1)

N. Imamura, C. Ota, “Experimental Study on Magneto-Optical Disk Exerciser with the Laser Diode and Amorphous Magnetic Thin Films,” Jpn. J. Appl. Phys. 19, L731 (1980).
[CrossRef]

Proc. Soc. Photo-Opt. Instrum. Eng. (2)

Y. Tsunoda, S. Horigome, Z. Tsutsumi, “Optical Digital Data Storage Technologies with Semiconductor Laser Head,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 24 (1983).

K. Ohta, A. Takahashi, T. Deguchi, T. Hyuga, S. Kobayashi, H. Yamaoka, “Magneto Optical Disk with Reflecting Layers,” Proc. Soc. Photo-Opt. Instrum. Eng. 382, 252 (1983).

Telev. Eng. Jpn. (1)

K. Horita, S. Kubo, K. Takahashi, “Design of Junction FET for Video Camera,” Telev. Eng. Jpn. TEBS74-1, 1 (1980).

Other (2)

M. Ojima, A. Arimoto, N. Chinone, T. Goto, K. Aiki, “Diode Laser Noise at Video Frequencies in Video Disk Players,” Appl. Opt.25, (1986), to be published.
[CrossRef] [PubMed]

Honeywell, U.S. Patent3368209 (22Oct.1964).

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Figures (17)

Fig. 1
Fig. 1

Optical configuration of a magnetooptical disk.

Fig. 2
Fig. 2

Dependence of C, N, and C/N on analyzer angle for PIN detector (left) and APD detector (right).

Fig. 3
Fig. 3

Relationship between the increase of C/N and multiplication rate of APD (calculated).

Fig. 4
Fig. 4

Dependence of C, N, and C/N on the extinction ratio of polarization detection optics.

Fig. 5
Fig. 5

Relationship between ΔC/N and extinction ratio (calculated).

Fig. 6
Fig. 6

Surface section of enlarged recording medium.

Fig. 7
Fig. 7

Laser mastering optics for cutting a between-the-grooves recording disk.

Fig. 8
Fig. 8

(a) SEM photograph of sector headers and (b) polarization microscope photograph of written magnetic domains.

Fig. 9
Fig. 9

Comparison of disk noise between in-groove recording and on-land (between-the-grooves) recording.

Fig. 10
Fig. 10

Relationship between ΔC/N and disk noise (calculated).

Fig. 11
Fig. 11

Dependence of C, N, and C/N on reading laser power for TC = 200°C (left) and 140°C (right).

Fig. 12
Fig. 12

Readout carrier waveform and corresponding spectrum.

Fig. 13
Fig. 13

Magnetooptical disk with sector header pits.

Fig. 14
Fig. 14

Sector header/magnetooptical data detection and processing configuration.

Fig. 15
Fig. 15

Time chart pattern for magnetic field and laser pulses.

Fig. 16
Fig. 16

Prototype compact magnetooptic disk and drive unit.

Fig. 17
Fig. 17

Top view (top) and side view (bottom) block diagrams of the drive unit.

Tables (1)

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Table I Prototype Specifications

Equations (9)

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N shot = [ 2 e P 0 α M 2.25 Δ f ( sin 2 θ A + ) ] 1 / 2 R G .
C = P 0 α M R G sin ( 2 θ A ) sin ( 2 θ K ) m ,
N disk = η disk dc = η disk P 0 α M R G ( sin 2 θ A + ) ,
N laser = η laser dc = η laser P 0 α M R G ( sin 2 θ A + ) .
θ K = θ K / ( R p 1 R p 2 ) 1 / 2 .
N disk = ( N disk 2 + N laser 2 + N shot 2 + N amp 2 ) 1 / 2 ,
N laser = ( N laser 2 + N shot 2 + N amp 2 ) 1 / 2 .
N amp = R G { 4 k T Δ f [ 1 R G + ( 2 π f ) 2 3 ( C o + C i ) 2 R eq ] } 1 / 2 .
RIN = 10 ( 1 / 10 log dc / N laser ) / Δ f = 10 ( 2 log η laser ) / Δ f .

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