3 probable M lens patents

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Jonathan Brady
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3 probable M lens patents
8 months ago

http://www.canonrumors.com/forum/index.php?topic=18824.0

Original source: http://egami.blog.so-net.ne.jp/2013-12-29

  • Patent Publication No. 2013-257507
    • Publication date 2013.12.26
    • Filing date 2012.6.14
  • Example 1
    • Zoom ratio 2.87
    • Focal length f = 18.58 - 27.82 - 53.36mm
    • Fno 3.60 -. 4.27 - 5.69
    • Half angle ω = 36.33 - 26.15 - 14.36 °
    • Image height Y = 13.66mm
    • 86.23 - - 104.79mm 78.22 overall length of the lens
    • BF 0.50mm
    • 13 pieces of 11-group lens configuration
    • Three four-sided aspherical
  • Example 3
    • Zoom ratio 10.39
    • Focal length f = 18.60 - 60.12 - 193.23mm
    • Fno 3.55 -. 5.59 - 6.60
    • Half angle ω = 36.29 - 12.80 - 4.04 °
    • Image height Y = 13.66mm
    • 151.48 - - 184.39mm 118.58 overall length of the lens
    • BF 0.50mm
    • 18 pieces of 14-group lens configuration
    • Three three-sided aspherical
    • One UD glass
  • Example 4
    • Zoom ratio 7.14
    • 15.87 - - 117.70mm 16.48 focal length (***note: the original source text says 51.87 - it should be 15.87 so I corrected it)
    • Fno 3.60 -. 5.30 - 5.88
    • Half angle ω = 39.65 - 14.75 - 6.62 °
    • Image height Y = 13.66mm
    • 138.55 - - 162.35mm 114.75 overall length of the lens
    • BF 0.50mm
    • 17 pieces of 13-group lens configuration
    • Two two-sided aspherical
    • One UD glass
  • Canon patents
    • Vibration control
    • Inner focus

These are all variable aperture zooms.  An 18-55, 18-200, 16-120.  The 16-120 is only about 4.5 inches long (the EF-M 18-55 is 2.4 inches long for reference).

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