Canon Patent for 17-55mm and 18-55mm STM Lenses (new kit lenses?)

Egami (translated) found a patent filed by Canon that appears to refer to new kit lenses: 17-55mm f/3.5-5.6 STM and 18-55mm f/3.5-5.6 STM. s you can see both lenses feature Canon’s newer STM (stepping motor) technology to drive the lens. STM is almost silent when operating, hence useful for videography.

• Patent Publication No. 2014-21258
  • Publication date 2014.2.3
  • Filing date 2012.7.18
• Example 2
  • Zoom ratio 2.92
  • Focal length f = 18.50-32.89-54.00mm
  • Fno. 3.49-4.39-5.80
  • Half angle ω = 36.44-22.55-14.20 °
  • Image height Y = 13.66mm
  • 119.77-110.06-120.23mm overall length of the lens
  • BF 37.98-52.51-74.3mm
• Example 3
  • Zoom ratio 3.09
  • Focal length f = 17.50-32.05-54.00mm
  • Fno. 3.47-4.38-5.80
  • Half angle ω = 37.97-23.08-14.20 °
  • Image height Y = 13.66mm
  • 119.55-108.81-118.68mm overall length of the lens
  • BF 36.59-51.53-73.93mm
• Canon patents
  • 4-group zoom of positive and negative positive negative
  • Inner folder – Kas (Group 3)
  • The fourth lens unit can also be used for anti-vibration