Patent classifications
G
PHYSICS
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G11
INFORMATION STORAGE
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G11B
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
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7/00
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation; by modifying optical properties or the physical structure; , reproducing using an optical beam at lower power; by sensing optical properties; Record carriers therefor
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G11B7/12
Heads, e.g. forming of the optical beam spot or modulation of the optical beam
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G11B7/135
Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
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G11B7/139
Numerical aperture control means
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G11B7/139

Objective lens, optical head device, optical information device, and optical disk system
11475917 · 2022-10-18 · ·

Provided is an objective lens which is used so that more information can be accumulated in a large-capacity optical disk and which has a further enhanced numerical aperture NA. The objective lens is a single lens having the numerical aperture NA and a refractive index n, and is configured so as to satisfy: NA≥0.91 and 1.61≤n<1.72.