Compound lenses, i.e. two or more lenses co-operating to perform a function

Official title: {Compound lenses, i.e. two or more lenses co-operating to perform a function, e.g. compound objective lens including a solid immersion lens, positive and negative lenses either bonded together or with adjustable spacing}

G11B2007/13727 (Compound lenses, i.e. two or more lenses co-operating to perform a function) appears on 643 US grants and 483 published applications in this corpus.