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Single Telephoto Lens for Focus Error Detection with Astigmatic Method |
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| Authors: | Yasuhiro TANAKA Hideki AIKOH Isamu YANO Takahisa KONDOU Masaaki SUNOHARA |
| Affiliation: | (1) Materials and Devices Laboratory, Matsushita Electric Industrial Co., Ltd., 1006, Kadoma, Kadoma, Osaka 571, Japan;(2) Product Development Engineering Center, Matsushita Electric Industrial Co., Ltd., 1006, Kadoma, Kadoma, Osaka 571, Japan |
| 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. |
| Keywords: | optical head molded glass asphere toric focus error lens design spot diagram |
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