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A circular arc slider with a high flying height supported by parallel flat springs for optical disc devices

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Abstract

We have investigated a circular arc slider with a high flying height that is suitable for optical disc devices to reduce the thickness of the device and to achieve a higher recording density over a wider recording area. Our proposed slider was supported by parallel flat springs to reduce the tilting motions of the slider in the pitching and rolling directions. Two types of slider were examined: (1) a positive pressure slider with a single shallow pocket on the slider surface, and (2) a negative pressure slider with two shallow pockets. The static and dynamic characteristics of our proposed slider were investigated both theoretically and experimentally. It was found that our proposed sliders followed a disc surface with the amplitude of axial runout of 100 μm with a focusing error of 30 μmp-v in the focusing direction and a tilt angle of <6 minp-v in the pitching and rolling directions.

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Abbreviations

a 1 :

amplitude of the axial runout of a rotating disc

h :

flying height of a slider

h 0 :

static flying height of a slider

h ave :

average flying height of a slider

g :

gravitational acceleration

I p and I r :

area moment of inertia in the pitching and rolling directions, respectively

k :

stiffness in the focusing direction

k p and k r :

angular stiffness in the pitching and rolling directions

m :

slider mass

N p and N r :

initial imposed moment on a slider

p a :

ambient pressure

p :

pressure

t :

time

u :

disc velocity in the x-direction

v :

disc velocity in the y-direction

w :

load capacity

w 0 :

initial imposed load on a slider

(x, y):

Cartesian coordinates

z :

axial displacement in the focusing direction

ρ :

density of air

μ :

viscosity of air

θ and φ :

tilt angles in the pitching and rolling directions, respectively

ξ and η :

boundary-fitted coordinates

References

  • ISO/IEC 17592, Information technology—120 mm (4.7 Gbytes per side) and 80 mm (1.46 Gbytes per side) DVD rewritable disc(DVD-RAM), ISO/IEC

  • JIS X 6243, Japanese Industrial Standard—120 mm DVD rewritable disc (DVD-RAM), Japanese Standards Association

  • Kawabata N (1986) A study on the Numerical Analysis of Fluid Film Lubrication by the Boundary-fitted Coordinates System (First Report, Fundamental Equation of DF Method and the Case of Incompressible Lubrication), Tran JSME, C, 53–494, 2155–2160

  • Kimura K, Ogasawara H et al (2005) Development of a three-dimensional actuator for compensating disc tilt in slim DVD drives. Trans Jpn Soc Mech Eng Ser C 71(702):243–248

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  • Shigee T, Mori K et al (1996) Floating type magnetic head for magneto-optical disc. Japanese patent application No. 08-23566

  • Tani T (1991) Reliability test of a high flying height slider bearing. 1st Report; Dust Adhesion to a slider. Trans Jpn Soc Mech Eng Ser C 69(702):330–332

  • Uchimaru K, Itoh A (1998) Optical disc device. Japanese Patent No. 2793338

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Authors and Affiliations

  1. Department of Mechanical Engineering, Tokyo University of Science, 1-3 Kagurazaka Shinjuku-ku, Tokyo, 162-8601, Japan

    Jun Tominaga, Takashi Watabe & Shigeka Yoshimoto

Authors
  1. Jun Tominaga
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  2. Takashi Watabe
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  3. Shigeka Yoshimoto
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Corresponding author

Correspondence to Jun Tominaga.

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Tominaga, J., Watabe, T. & Yoshimoto, S. A circular arc slider with a high flying height supported by parallel flat springs for optical disc devices. Microsyst Technol 13, 1131–1139 (2007). https://doi.org/10.1007/s00542-006-0325-6

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  • DOI: https://doi.org/10.1007/s00542-006-0325-6

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