Canon Patents For 55mm f/1.4 Lens And Other Primes

Egami (translated) spotted a patent filed by Canon for a 55mm f/1.4, a 35mm f/1.4, and other fast primes.

• Patent Publication No. 2014-123018
  • Publication date 2014.7.3
  • Filing date 2012.12.21
• Example
  

  embodiment

  Example	Focal length	Fno.	Half angle	The overall length of the lens	BF	MOD
  One	49.53	1.45	23.60	99.46	38.10	450
  Two	35.88	1.45	31.09	126.92	38.77	300
  Three	55.42	1.45	21.33	100.44	40.24	450
  Four	50.75	1.45	23.09	98.17	38.29	450

  Image height = 21.64mm

• Canon patents
  • Positive and negative Shibomake positive
  • Inner focus