4. Optical: systems and elements
  5. Lens
  6. Plural focal length
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Device for equalizing light strength of light source

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

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Diffraction type lens and optical pickup apparatus using the...

Optical: systems and elements – Lens – Plural focal length
Reexamination Certificate

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Dual focus lens with extended depth of focus

Optical: systems and elements – Lens – Plural focal length
Reexamination Certificate

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Dual-focus objective lens of optical pickup

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

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