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Single Telephoto Lens for Focus Error Detection with Astigmatic Method

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Abstract

An astigmatic method for focus error detection has been integrated into a singlet. The first convex and the second concave surfaces compose a telephoto system with a telephoto ratio of about 0.4. The first surface of the lens is rotationally symmetrical asphere and the second surface is a toric shape whose aspherical profiles correct spherical aberration. We implemented our optical design using a molded glass process. Its performance was confirmed using the optical head of a magneto-optical disk system.

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References

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Authors and Affiliations

  1. Materials and Devices Laboratory, Matsushita Electric Industrial Co., Ltd., 1006, Kadoma, Kadoma, Osaka, 571, Japan

    Yasuhiro TANAKA, Hideki AIKOH, Takahisa KONDOU & Masaaki SUNOHARA

  2. Product Development Engineering Center, Matsushita Electric Industrial Co., Ltd., 1006, Kadoma, Kadoma, Osaka, 571, Japan

    Isamu YANO

Authors
  1. Yasuhiro TANAKA
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  2. Hideki AIKOH
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  3. Isamu YANO
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  4. Takahisa KONDOU
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  5. Masaaki SUNOHARA
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TANAKA, Y., AIKOH, H., YANO, I. et al. Single Telephoto Lens for Focus Error Detection with Astigmatic Method. OPT REV 1, 33–35 (1994). https://doi.org/10.1007/s10043-994-0033-3

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  • DOI: https://doi.org/10.1007/s10043-994-0033-3

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