テレビジョン学会技術報告
Online ISSN : 2433-0914
Print ISSN : 0386-4227
ホログラム-体型レンズを用いた2焦点光ヘッド
金馬 慶明田中 康弘浦入 賢一郎西野 清治水野 定夫
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研究報告書・技術報告書 フリー

1996 年 20 巻 45 号 p. 17-21

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A dual focus optical head with a holographic optical element (HOE) that can read both 0.6 mm disks and 1.2 mm disks has been developed. We evaluated allowable ranges for the misalignment of the HOE, the wavelength deviation, the disk tilt angle and the defocus distance. It was found that except for the issue of coma aberration, the allowable ranges are wide enough for mass-production. When an objective lens having initial coma aberration is used with a plane-type HOE, coma aberration still remains for the 1.2 mm disk after performing skew adjustment for the 0.6 mm disk. We found that the aberration can be reduced by integrating an HOE with the objective lens on its first surface.

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© 1996 一般社団法人映像情報メディア学会
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