Archive for the ‘Canon Patents’ Category

Patent: Canon EF 300mm f/4L IS & Others

Patent: Canon EF 300mm f/4L IS & Others

A patent for a new EF 300mm f/4L IS has appeared. Other optical formulas appearing in the patent are 24mm f/2.8 and 50mm f/1.3 with variable diffractive index elements which help correct some aberrations (thanks Keith).

Patent Publication No. 2015-28551 (Google Translated)

  • Published 2015.2.12
  • Filing date 2013.7.30

Example

Example Focal distance Fno. Half angle Image height Overall length of the lens BF
One 294.00 4.14 4.21 21.64 239.07 83.42
Two 24.48 2.86 41.47 21.64 92.00 38.00
Three 51.70 1.30 22.71 21.64 94.01 37.50
Four 294.00 4.14 4.21 21.64 240.00 82.95
Five 6.15 20.45 71.28 2.88 3.71 3.69 30.34 9.98 2.89 3.60 84.11 86.12 90.41 11.74 15.68 8.50
Six 293.97 4.14 4.21 21.64 239.98 85.34

Source: [Egami]

cr

23 Comments

Patent: Optional Image Stabilization Unit

Patent: Optional Image Stabilization Unit

A patent showing an optional image stabilization unit that can be put into a lens without changing its focal length has been filed.

Patent Publication No. 2015-28555 (Google Translated)

  • Published 2015.2.12
  • Filing date 2013.7.30

Example 1a (master lens only)

  • Focal length 392.50
  • F-number 2.92
  • Half angle of 3.16
  • Image height 21.64
  • Overall length of the lens 379.64
  • BF 41.57
  • Effective diameter of the front lens 135.72mm
  • Lens configuration 8 groups nine

+Continue Reading

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Phase Difference AF Patents for Mirrorless

Phase Difference AF Patents for Mirrorless

A bunch of new patents for phase-difference AF have appeared. They look to be related to mirrorless and EVF applications.

Patent Publication No. 2015-22264 (Google Translated)

  • Published 2015.2.2
  • Filing date 2013.7.23

Canon patent

  • Phase difference detection method to be received by the AF sensor can be reflected incident light from the imaging lens
  • The phase difference detection by the image plane phase difference AF
  • The phase difference detection by external light AF sensor

Source: [EG] via [NL]

cr

2 Comments

Patent: CN-E 35-260mm f/2.8 Soft Focus Lens

Patent: CN-E 35-260mm f/2.8 Soft Focus Lens

Canon has published a patent for a new zoom cinema lens with a soft focus mechanism. The lens is for the Super 35 image sensor size.

Patent Publication No. 2014-235203 (Google Translated)

  • Published 2014.12.15
  • Filing date 2013.5.31

Example 3

  • Zoom ratio 7.50
  • The focal length f = 34.00-68.00-102.00-136.00-254.99mm
  • Fno. 2.70
  • Half angle ω = 24.58-12.88-8.67-6.52-3.49 °
  • Image height Y = 15.55mm
  • Overall length of the lens 441.54mm
  • BF 51.02mm

Canon patent

  • 4-group zoom of positive and negative negative-positive
  • Spherical aberration adjustment group (soft focus)
  • Not shift the focus position can be switched to soft focus

Source: [EG]

cr

26 Comments

Patent: Plastic/Resin Mount for DSLRs

Patent: Plastic/Resin Mount for DSLRs

A patent showing a metal & plastic resin mount for DSLRs is available to view. The plastic part of the mount seems to be for a much smoother mounting and dismounting of lenses. There could also be some weight and cost savings for lower priced cameras like the EOS Rebel line.

Patent Publication No. 2014-240858 (Google Translated)

  • Published 2014.12.25
  • Filing date 2013.6.11

Canon patent

  • Of bayonet mechanism mount
  • Mounting an inner peripheral portion of the body has a concave rail surfaces of metal
  • Mount the outer periphery of having a rail surface of the convex shape in the resin
  • That resin rail than the metal rail, I have a narrow width and high height

Source: [EG]

cr

22 Comments