4. Optical: systems and elements
  5. Lens
  6. Plural focal length

Kyung-hwa Rim

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Critical angle focus error detector

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent

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Dual-focus objective lens of optical pickup

Optical: systems and elements – Lens – Plural focal length
Patent

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Focus error detection with two symmetrically splitted reflected

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent

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Focus error detector

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent

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Inverse image generating method apparatus thereof and focus erro

Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
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Profile ID: LFUS-PAI-P-130672

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