Canon Patent for Transparent Mirror

Egami (translated) spotted a pretty interesting patent filed by Canon. The patent refers to a transparent mirror technology (aka pellicle mirror), the technology Sony employes on their SLT cameras. This could be a hint about what Canon’s engineers are working on.

  • Patent Publication No. 2013-218241
    • Publication date 2013.10.24
    • Filing date 2012.4.12
  • Canon patent
    • Pellicle mirror
    • The transmitted light image sensor in, I lead the OVF the reflected light
    • Reflectance (transmittance) variable
    • (Low transmittance) high set the reflectance OVF when, at the time of imaging is set (high transmittance) low reflectance

 

Are These Canon Lens Patents For The EOS M System?

2013_218015_fig01
35mm f/1.4
2013_218015_fig05-2fe73-2
50mm f/1.4
2013_218015_fig09-54191
50mm f/1.8

Egami (translated) spotted Canon patents for three lenses that could been thought for the EOS M mirrorless system, a 5omm f/1.8, 50mm f/1.4 and 35mm f/1.4. Egami’s analysis of the patents suggests this interpretation, i.e. that these lenses are made for an APS-C mirrorless system. Sound exciting, having such primes for the EOS M would at least allow us to think that Canon is committed to their mirrorless system. More details and specs after the break.

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Canon Patent: 35mm f/1.4 Lens – Successor of The EF 35mm f/1.4L On Its Way?

Canon Patent

This could be the patent for the Canon EF 35mm f/1.4L II lens. Egami (translated) spotted a patent filed by Canon that’s related to a 35mm f/1.4 lens that appears to refer to the successor of the Canon EF 35mm f 1.4L USM (price & specs) lens (released in 1998). Not the first patent for a 35mm lens, and there was a rumor that Canon was field-testing a EF 35mm f/1.4L II lens. More after the break.

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Canon Patent: 18-270mm , 18-300mm , 18-200mm , 16-240mm , 16-200mm f/3.5-5.6 Lenses

Canon Patent

New APS-C superzooms coming?

Egami (translated) spotted a new Canon patent. The patent refers to 18-270mm , 18-300mm , 18-200mm , 16-240mm , 16-200mm f/3.5-5.6 lenses.

Description and self-interpretation of the patent literature

  • Patent Publication No. 2013-190453
    • Publication date 2013.9.26
    • Filing date 2012.3.12
  • Example
    embodiment
    No. Focal length Fno. Half angle Lens constitution Aspheric surface UD glass
    One 18.75 – 59.52 – 270.67 3.18 – 4.69 – 5.88 36.08 – 12.93 – 2.89 19 pieces of 14 group Three 3 surface Three
    Three 18.67 – 54.99 – 299.50 3.39 – 4.79 – 5.88 36.18 – 13.95 – 2.61 21 pieces of 16 group Four 4 surface Three
    Four 18.54 – 49.15 – 194.16 3.22 – 4.22 – 5.66 36.36 – 15.52 – 4.02 18 pieces in 11 groups Two 2 surface Three
    Six 16.53 – 54.38 – 237.95 3.42 – 4.72 – 5.88 39.56 – 14.10 – 3.29 18 sheets 13 group Four 4 surface Two
    Seven 16.81 – 47.39 – 194.13 3.32 – 4.46 – 5.66 39.07 – 16.07 – 4.02 17 pieces of 12 group Two 2 surface Two
  • Canon patent
    • 6-group zoom of positive and negative positive and negative positive and negative
    • Rear focus
Canon Patent
From left to right: spherical aberration, astigmatism, distortion, lateral chromatic aberration.
[via Egami]

Canon Patent: 24-70mm f/2.8 Image Stabilized Lens

There has been a rumor about a Canon 24-70mm f/2.8 IS lens surfacing last year, now Egami (translated) spotted a related patent (referring also to a 28-80 f/2.8 IS lens). This could be a very exciting lens!

  • Patent Publication No. 2013-182246
    • Publication date 2013.9.12
    • Filing date 2012.3.5
  • Example 1
    • Zoom ratio 2.75
    • Focal length f = 24.70-36.42-67.88mm
    • Fno. 2.91
    • Half angle ω = 41.22-30.71-17.68 °
    • Image height 21.64mm
    • 164.87-172.85-196.79mm overall length of the lens
    • BF 39.07-44.44-54.56mm
    • 20 pieces of 13-group lens configuration
    • Four four-sided aspherical
  • Example 2
    • Zoom ratio 2.76
    • Focal length f = 24.70-34.88-68.18mm
    • Fno. 2.91
    • Half angle ω = 41.22-31.81-17.61 °
    • Image height 21.64mm
    • 165.79-174.26-199.67mm overall length of the lens
    • BF 38.47-42.81-58.00mm
    • 20 pieces of 15-group lens configuration
    • Three 3 aspherical surface
  • Example 3
    • Zoom ratio 3.22
    • Focal length f = 24.70-39.67-79.43mm
    • Fno. 2.91
    • 41.22-28.61-15.24 ° angle of view
    • Image height 21.64mm
    • 161.98-171.74-200.99mm overall length of the lens
    • BF 38.35-46.17-57.64mm
    • 20 pieces of 13-group lens configuration
    • Four four-sided aspherical
  • Canon patent
    • 5-group zoom of positive and negative positive positive and negative
    • Antivibration (fourth lens group)