We reported about a Canon patent for a Cine lens a few days ago. Today we have another patent for two more Cine lenses. Canon’s Cine lenses are professional tools that go up to $40,000.

• Patent Publication No. 2015-18083
  • Published 2015.1.29
  • Filing date 2013.7.10
• Example 1
  • Zoom ratio 6.00
  • Focal length 21.00 87.93 125.94
  • F number 2.77 2.77 3.66
  • Half angle of 35.54 9.68 6.79
  • Image height 15.00
  • Overall length of the lens 314.76
  • BF 50.03
• Example 2
  • Zoom ratio 5.00
  • Focal length 20.00 69.46 100.00
  • F number 2.76 2.77 2.77
  • Half angle of 36.50 12.03 8.42
  • Image height 14.80
  • Overall length of the lens 294.44
  • BF 50.07
• Canon patents
  • Positive and negative positive and negative positive five-group zoom
  • Inner focus (part of the first group)
  • Inner zoom

Another Canon patent. This time we have a patent for a new Cine lens, CN-E 18-85mm f/2.8. The patent for the 18-85mm seems to share the same optical formula as the already released CN-E 15.5-47mm f/2.8 lens.

• Patent Publication No. 2015-4917
  • Published 2015.1.8
  • Filing date 2013.6.24
• Example 1
  • Zoom ratio 2.80
  • Focal length 16.00 29.68 44.80
  • F number 2.80
  • Half angle (in degrees) 43.15 26.81 18.51
  • Image height 15.00
  • Overall length of the lens 263.54
  • BF 39.04
• Example 2
  • Zoom ratio 4.50
  • Focal length 18.50 45.61 83.25
  • F number 2.80
  • Half angle (in degrees) 39.04 18.20 10.21
  • Image height 15.00
  • Lens length 263.78 263.78 263.78
  • BF 46.93 46.93 46.93
• Canon patents
  • 5-group zoom of positive and negative negative-positive-positive
  • Inner focus (part of the first group)
  • Inner zoom

Canon filed a patent for a 24-120mm f/3.5-5.6 IS lens. Most likely a lens for full-frame sensors.

• Patent Publication No. 2015-132637
  • Published 2015.7.23
  • Filing date 2014.1.9
• Example 4
  • Zoom ratio 4.76
  • Focal length 24.73 55.13 117.60
  • Fno. 3.60 4.91 5.83
  • Half angle of 41.18 21.43 10.42
  • Image height 21.64
  • Overall length of the lens 149.01 170.43 200.01
  • BF 38.67 61.21 74.86
• Canon patents
  • Anti-vibration (Group 6)

Canon filed a patent for an EF 600mm f/4 DO IS lens, i.e. a lens with diffractive optical elements.

• Patent Publication No. 2015-11171
  • Published 2015.1.19
  • Filing date 2013.6.28
• Example 2
  • Focal length 588.30mm
  • Fno. 4.12
  • Angle of view 2.11 °
  • Image height 21.64mm
  • The total lens length 397.80mm
  • BF 2.02mm
  • Positive ShiboTadashi
  • Inner focus
  • Vibration control

The Canon patent describes a body cap that keeps the lens mount of a DSLR lubricated. To be honest I can’t grab the utility of this, except that it could concern the electric contacts (keeping them clean) . Since we get this patent literature translated by a machine, I am never sure the translated words are any helpful.

• Patent Publication No. 2015-121747
  • Published 2015.7.2
  • Filing date 2013.12.25
• Canon patents
  • Mount Cap
  • The mount and abutting surface, and oil-impregnated possible member, such as a porous plastic