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Canon Patent For 10-22mm Lens With Liquid Element (it’s not the first)

Lens With Liquid Element

Egami (translated) spotted a patent filed by Canon for 10-22mm f/3.5-4.5 lens with a liquid element. Liquid lenses work by applying an electric voltage to an electrolytic solution (that’s the liquid) in order to curve its surface (called meniscus). This is not the first patent of this kind filed by Canon (1 | 2). Hard to say if such a lens will come to the market any time soon.

  • Patent Publication No. 2014-145883
    • Published Date 2014.8.14
    • Filing date 2013.1.29
  • Example 4
    • Zoom ratio 2.07
    • Focal length f = 10.30-13.12-21.35mm
    • Fno. 3.23-3.62-4.63
    • Half angle ω = 52.86-46.03-32.50 °
    • Image height 13.60mm
    • The overall length of the lens 135.13-133.91-135.09mm
    • BF 0.15mm
  • Canon patents
    • And by varying the shape of the boundary surface, thereby changing the refractive power
    • Zooming, and has a refractive power element is positive, the element is negative
    • And reduce the variation of the curvature
[via Egami]
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