Abstract

The use of an astigmatic lens to generate a position error signal (PES) suitable for servo control is discussed. A simple computer model was written that can predict adequately the performance of an astigmatic system. The effect of various system parameters on the PES is presented.

© 1984 Optical Society of America

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References

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  1. L. J. Laub, IEEE Trans. Consum. Electron. CE-22, 258 (1976).
    [CrossRef]
  2. G. Bouwhuis, J. J. M. Braat, Appl. Opt. 17, 1993 (1978).
    [CrossRef] [PubMed]
  3. A. M. Earman, “Optical Focus Servo for Optical Disk Mass Data Storage System Application,” Proc. Soc. Photo-Opt. Instrum. Eng. 329, (1982).
  4. C. Bricot, J. C. Lehureau, C. Pucch, IEEE Trans. Consum. Electron. CE-22, 304 (1978).
    [CrossRef]
  5. A. Yariv, Quantum Electronics (Wiley, New York, 1975).
  6. This is only true for a lens actuator which has a restoring force such as a support spring exerted on it.

1982 (1)

A. M. Earman, “Optical Focus Servo for Optical Disk Mass Data Storage System Application,” Proc. Soc. Photo-Opt. Instrum. Eng. 329, (1982).

1978 (2)

C. Bricot, J. C. Lehureau, C. Pucch, IEEE Trans. Consum. Electron. CE-22, 304 (1978).
[CrossRef]

G. Bouwhuis, J. J. M. Braat, Appl. Opt. 17, 1993 (1978).
[CrossRef] [PubMed]

1976 (1)

L. J. Laub, IEEE Trans. Consum. Electron. CE-22, 258 (1976).
[CrossRef]

Bouwhuis, G.

Braat, J. J. M.

Bricot, C.

C. Bricot, J. C. Lehureau, C. Pucch, IEEE Trans. Consum. Electron. CE-22, 304 (1978).
[CrossRef]

Earman, A. M.

A. M. Earman, “Optical Focus Servo for Optical Disk Mass Data Storage System Application,” Proc. Soc. Photo-Opt. Instrum. Eng. 329, (1982).

Laub, L. J.

L. J. Laub, IEEE Trans. Consum. Electron. CE-22, 258 (1976).
[CrossRef]

Lehureau, J. C.

C. Bricot, J. C. Lehureau, C. Pucch, IEEE Trans. Consum. Electron. CE-22, 304 (1978).
[CrossRef]

Pucch, C.

C. Bricot, J. C. Lehureau, C. Pucch, IEEE Trans. Consum. Electron. CE-22, 304 (1978).
[CrossRef]

Yariv, A.

A. Yariv, Quantum Electronics (Wiley, New York, 1975).

Appl. Opt. (1)

IEEE Trans. Consum. Electron. (2)

C. Bricot, J. C. Lehureau, C. Pucch, IEEE Trans. Consum. Electron. CE-22, 304 (1978).
[CrossRef]

L. J. Laub, IEEE Trans. Consum. Electron. CE-22, 258 (1976).
[CrossRef]

Proc. Soc. Photo-Opt. Instrum. Eng. (1)

A. M. Earman, “Optical Focus Servo for Optical Disk Mass Data Storage System Application,” Proc. Soc. Photo-Opt. Instrum. Eng. 329, (1982).

Other (2)

A. Yariv, Quantum Electronics (Wiley, New York, 1975).

This is only true for a lens actuator which has a restoring force such as a support spring exerted on it.

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Figures (15)

Fig. 1
Fig. 1

Typical disk reader optics.

Fig. 2
Fig. 2

Effects of focus condition on reflected beam.

Fig. 3
Fig. 3

Transformation of the reflected beam by the astigmatic lens.

Fig. 4
Fig. 4

Typical position error signal.

Fig. 5
Fig. 5

Effect of detector size on the PES.

Fig. 6
Fig. 6

Effect of lens separation on the PES.

Fig. 7
Fig. 7

Effect of the amount of astigmatism on the PES.

Fig. 8
Fig. 8

Effect of detector displacement in the X direction.

Fig. 9
Fig. 9

Effect of detector displacement in the Y direction.

Fig. 10
Fig. 10

Combined displacements of equal magnitude in the X and Y directions.

Fig. 11
Fig. 11

Measured PES for a 100-mm focal length cylinder lens system.

Fig. 12
Fig. 12

Measured effects on the cylinder lens PES by displacements in the X direction.

Fig. 13
Fig. 13

Measured effects on the cylinder lens PES by displacements in the Y direction.

Fig. 14
Fig. 14

Measured PES for a 210-mm, 200-mm astigmatic lens system.

Fig. 15
Fig. 15

Effects of detector misalignment for the 210-mm, 200-mm astigmatic system on the PES.

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