Nikon 50mm f/1.2 and 60mm f/1.2 Lens Patents

Nikon filed new patents in Japan. New patents include the Nikon Nikon 50mm f/1.2 and 60mm f/1.2 lenses. Nikon has patents filed for the 50mm f/1.2 lens with different variations of it. This lens has been the most patented Nikkor lens in the past few years.

The latest Nikon patents has calculations for optimized/reduced lens ghost and lens flare. Below are the details of the new patents filed by Nikon for the 50mm f/1.2 and 60mm f/1.2 lenses. (translated by Google)

Nikon 50mm f/1.2 and 60mm f/1.2 Lens Patents

Description and self-interpretation of the patent literature

• Patent Publication No. 2013-145337
  • Publication date 2013.7.25
  • Filing date 2012.1.16
• Example 1
  • Focal length f = 51.6
  • Fno. 1.21
  • Half angle ω = 23.25 °
  • Image height Y = 21.6mm
  • Length 92.60mm
  • Lens thickness 54.30mm
  • BF = 38.30mm
  • Seven six lens configuration
• Example 3
  • Focal length f = 60.90
  • Fno. 1.21
  • Half angle ω = 19.81 °
  • Image height Y = 21.6mm
  • Length 92.0997mm
  • Lens thickness 53.8000mm
  • BF = 38.2997mm
  • Seven six lens configuration
• Nikon patents
  • Positive and negative positive negative
  • Anti-reflective curtain with wet process
    • Of the multi-layer film, the surface side most
    • Refractive index n <= 1.30
    • And concave in the front and rear of the diaphragm, is applied to an appropriate position other
    • I reduce ghost and flare
  • I use a high refractive index and low dispersion lens
    • Correction sagittal aberration, axial chromatic aberration, lateral chromatic aberration, curvature of field without a diffractive optical element and aspherical

via EG & NR