Abstract

A novel, to our knowledge, optics pickup for semiconfocal optical disk is proposed. Five tracks are imaged simultaneously by use of one linear-shaped beam that extends over the tracks in the radial direction with the focusing and the tracking position controlled. We also show how the cross talk between tracks is eliminated automatically. The approximately diffraction-limited width of the beam and the small-signal detector elements make semiconfocal detection possible in the tangential direction.

© 1998 Optical Society of America

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References

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  1. C. W. Reno, “Optical disk recording techniques for data rates beyond 100 Mbps,” in Optical Disk Systems and Applications, E. V. LaBudde, ed., Proc. SPIE421, 156–157 (1983).
    [CrossRef]
  2. D. B. Carlin, J. P. Bednarz, C. J. Kaiser, J. C. Connolly, M. G. Harvey, “Multichannel optical recording using monolithic arrays of diode lasers: errata,” Appl. Opt. 23, 4613–4619 (1984).
    [CrossRef] [PubMed]
  3. R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
    [CrossRef]
  4. H. Kuribayashi, S. Miyanabe, Y. Tomita, M. Ogasawara, K. Yamamoto, “High density reproduction system using a cross-talk canceler,” in Technical Digest of the Magneto-Optical Recording International Symposium/International Symposium on Optical Memory (Business Center for Academic Societies of Japan, Tokyo, 1997), pp. 286–287.
  5. H. Dobashi, T. Tanabe, M. Yamamoto, “Three-track readout method using two offset beams,” Jpn. J. Appl. Phys. 35, 454–458 (1996).
    [CrossRef]
  6. P. J. Marchand, A. V. Krishnamoorthy, K. S. Urquhart, P. Ambs, S. C. Esener, S. H. Lee, “Motionless-head parallel readout optical-disk system,” Appl. Opt. 32, 190–203 (1993).
    [CrossRef] [PubMed]
  7. M. A. Neifeld, M. McDonald, “Lens-design issues affecting parallel readout of optical disks,” Appl. Opt. 34, 5167–5174 (1995).
    [CrossRef] [PubMed]
  8. C. J. R. Sheppard, A. Choudhury, “Image formation in the scanning microscope,” Opt. Acta 24, 1051–1073 (1977).
    [CrossRef]
  9. Y. Yamanaka, Y. Hirose, H. Fujii, K. Kubota, “High-density recording by superresolution in a optical disk memory system,” Appl. Opt. 29, 3046–3051 (1990).
    [CrossRef] [PubMed]
  10. “120 mm DVD-read-only disk,” in ECMA Standardizing Information and Communication Systems (European Computer Manufacturers Association, Geneva, Switzerland, 1997), p. 267.

1996 (1)

H. Dobashi, T. Tanabe, M. Yamamoto, “Three-track readout method using two offset beams,” Jpn. J. Appl. Phys. 35, 454–458 (1996).
[CrossRef]

1995 (1)

1994 (1)

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

1993 (1)

1990 (1)

1984 (1)

1977 (1)

C. J. R. Sheppard, A. Choudhury, “Image formation in the scanning microscope,” Opt. Acta 24, 1051–1073 (1977).
[CrossRef]

Ambs, P.

Arai, R.

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

Bednarz, J. P.

Carlin, D. B.

Choudhury, A.

C. J. R. Sheppard, A. Choudhury, “Image formation in the scanning microscope,” Opt. Acta 24, 1051–1073 (1977).
[CrossRef]

Connolly, J. C.

Dobashi, H.

H. Dobashi, T. Tanabe, M. Yamamoto, “Three-track readout method using two offset beams,” Jpn. J. Appl. Phys. 35, 454–458 (1996).
[CrossRef]

Esener, S. C.

Fujii, H.

Harvey, M. G.

Hirose, Y.

Kaiser, C. J.

Katoh, K.

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

Krishnamoorthy, A. V.

Kubota, K.

Kuribayashi, H.

H. Kuribayashi, S. Miyanabe, Y. Tomita, M. Ogasawara, K. Yamamoto, “High density reproduction system using a cross-talk canceler,” in Technical Digest of the Magneto-Optical Recording International Symposium/International Symposium on Optical Memory (Business Center for Academic Societies of Japan, Tokyo, 1997), pp. 286–287.

Lee, S. H.

Marchand, P. J.

McDonald, M.

Miyanabe, S.

H. Kuribayashi, S. Miyanabe, Y. Tomita, M. Ogasawara, K. Yamamoto, “High density reproduction system using a cross-talk canceler,” in Technical Digest of the Magneto-Optical Recording International Symposium/International Symposium on Optical Memory (Business Center for Academic Societies of Japan, Tokyo, 1997), pp. 286–287.

Mizukami, M.

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

Murata, S.

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

Neifeld, M. A.

Ogasawara, M.

H. Kuribayashi, S. Miyanabe, Y. Tomita, M. Ogasawara, K. Yamamoto, “High density reproduction system using a cross-talk canceler,” in Technical Digest of the Magneto-Optical Recording International Symposium/International Symposium on Optical Memory (Business Center for Academic Societies of Japan, Tokyo, 1997), pp. 286–287.

Reno, C. W.

C. W. Reno, “Optical disk recording techniques for data rates beyond 100 Mbps,” in Optical Disk Systems and Applications, E. V. LaBudde, ed., Proc. SPIE421, 156–157 (1983).
[CrossRef]

Sato, I.

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

Sheppard, C. J. R.

C. J. R. Sheppard, A. Choudhury, “Image formation in the scanning microscope,” Opt. Acta 24, 1051–1073 (1977).
[CrossRef]

Tanabe, T.

H. Dobashi, T. Tanabe, M. Yamamoto, “Three-track readout method using two offset beams,” Jpn. J. Appl. Phys. 35, 454–458 (1996).
[CrossRef]

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

Tanaka, Y.

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

Tomita, Y.

H. Kuribayashi, S. Miyanabe, Y. Tomita, M. Ogasawara, K. Yamamoto, “High density reproduction system using a cross-talk canceler,” in Technical Digest of the Magneto-Optical Recording International Symposium/International Symposium on Optical Memory (Business Center for Academic Societies of Japan, Tokyo, 1997), pp. 286–287.

Urquhart, K. S.

Yamamoto, K.

H. Kuribayashi, S. Miyanabe, Y. Tomita, M. Ogasawara, K. Yamamoto, “High density reproduction system using a cross-talk canceler,” in Technical Digest of the Magneto-Optical Recording International Symposium/International Symposium on Optical Memory (Business Center for Academic Societies of Japan, Tokyo, 1997), pp. 286–287.

Yamamoto, M.

H. Dobashi, T. Tanabe, M. Yamamoto, “Three-track readout method using two offset beams,” Jpn. J. Appl. Phys. 35, 454–458 (1996).
[CrossRef]

Yamanaka, Y.

Yamazaki, H.

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

Yoshizawa, T.

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

Appl. Opt. (4)

Jpn. J. Appl. Phys. (2)

R. Arai, M. Mizukami, T. Tanabe, K. Katoh, T. Yoshizawa, H. Yamazaki, S. Murata, Y. Tanaka, I. Sato, “Feasibility study on high data transfer rate of 300 Mbits/s with eight-beam laser diode array,” Jpn. J. Appl. Phys. 32, 5411–5416 (1994).
[CrossRef]

H. Dobashi, T. Tanabe, M. Yamamoto, “Three-track readout method using two offset beams,” Jpn. J. Appl. Phys. 35, 454–458 (1996).
[CrossRef]

Opt. Acta (1)

C. J. R. Sheppard, A. Choudhury, “Image formation in the scanning microscope,” Opt. Acta 24, 1051–1073 (1977).
[CrossRef]

Other (3)

“120 mm DVD-read-only disk,” in ECMA Standardizing Information and Communication Systems (European Computer Manufacturers Association, Geneva, Switzerland, 1997), p. 267.

C. W. Reno, “Optical disk recording techniques for data rates beyond 100 Mbps,” in Optical Disk Systems and Applications, E. V. LaBudde, ed., Proc. SPIE421, 156–157 (1983).
[CrossRef]

H. Kuribayashi, S. Miyanabe, Y. Tomita, M. Ogasawara, K. Yamamoto, “High density reproduction system using a cross-talk canceler,” in Technical Digest of the Magneto-Optical Recording International Symposium/International Symposium on Optical Memory (Business Center for Academic Societies of Japan, Tokyo, 1997), pp. 286–287.

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Figures (10)

Fig. 1
Fig. 1

Linear-spread-beam optical disk pickup apparatus. A cylindrical lens is used to form a linear-shaped beam on the disk. A detector array is located on the image plane of the disk.

Fig. 2
Fig. 2

Cross section of a linear-spread beam (solid curve) and the Airy distribution (dotted curve). The intensity of the first dark line is approximately 4% of the peak level in case of the linear beam.

Fig. 3
Fig. 3

Array detector pattern designed for simultaneous multitrack readout. Elements A, B, C, D, E, and F are used for focusing control. Elements J, K, L, and M are used for detecting each separate track. Elements G and H are for the center track signal and tracking-error generation.

Fig. 4
Fig. 4

Block diagram of the cross-talk canceller circuit used in our experiment. VCA, voltage-controlled amplifier.

Fig. 5
Fig. 5

Operation of a cross-talk canceller: (a) the ac component of a detected neighboring track signal and (b) the ac component of a signal from the center track detector. The center track signal is sampled when the neighboring track signal level is high [bold lines in (a)].

Fig. 6
Fig. 6

Experimental apparatus. A polarized beam splitter and a quarter-wave plate were used. The light distribution was monitored with a CCD located at the conjugate position of the detector array.

Fig. 7
Fig. 7

Tracking-error signal obtained from the subtraction of two detector outputs at the center track image. The waveform is similar to that of a conventional push–pull method error.

Fig. 8
Fig. 8

On the left is the image of the tracks observed with the CCD. On the right the lines or dots correspond to pits, as illustrated.

Fig. 9
Fig. 9

Eye-pattern signals obtained from detector (a) element J, (b) element K, (c) the sum G + H, (d) element L, and (e) element M.

Fig. 10
Fig. 10

Eye-pattern signal when the cross-talk canceller is on (top) and off (bottom). The disk is tilted by 0.5°.

Equations (8)

Equations on this page are rendered with MathJax. Learn more.

FE = A + B - C + D + E + F ,
d - 1 t = α p n - 2 t + p n - 1 t + β p n t ,
d 0 t = α p n - 1 t + p n t + β p n + 1 t ,
d + 1 t = α p n t + p n + 1 t + β p n + 2 t ,
s n t = ad - 1 t + d 0 t + bd + 1 t ,
CE - 1 = s n t ac d - 1 t > 0 ,
CE + 1 = s n t ac d + 1 t > 0 .
s n t = - α 2 p n - 2 t + 1 - 2 α β p n t - β 2 p n + 2 t ,

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