Canon Patent For 600mm f/4 Lens

Canon Patent

Egami (translated) spotted a patent filed by Canon for a new 600mm f/4 lens. Egami suggests the lens will be ready for Tokyo Olympic Games in 2020 and the Rio de Janeiro Olympic Games in 2016.

  • Patent Publication No. 2014-26210
    • Publication date 2014.2.6
    • Filing date 2012.7.30
  • Example 1
    • Focal length f = 588mm
    • Fno. 4.12
    • Angle of view 2ω = 4.22 °
    • BF 56.0mm
    • Total lens length 374.7mm
    • Inner focus
  • Example 5
    • Focal length f = 588mm
    • Fno. 4.12
    • Angle of view 2ω = 4.22 °
    • BF 55.0mm
    • Total lens length 343.5mm
    • Inner focus
    • Diffraction optical element
  • Effect of the glass material
    • Fluorite (Fluorite)
      • In the long lens fluorite + total length, correction of chromatic aberration is easy
      • In short lens fluorite + total length, correction of chromatic aberration is difficult
    • Diffractive optical element (DOE)
      • Diffractive optical element can be corrected if the chromatic aberration
      • Flare caused by light diffraction

Canon Patent for 24-85mm and 24-70mm Lenses (with Macro)

pat

Lots of Canon patents surfaced in the last weeks. Here is another one spotted by Egami (translated). If I got the (machine-) translated text right, both lenses should also feature macro capabilities.

  • Patent Publication No. 2014-16464,2014-16465
    • Publication date 2014.1.30
    • Filing date 2012.7.9
  • Example 3
    • Macro when in parentheses
    • Zoom ratio 2.84 (2.87)
    • Focal length f = 24.30-35.10-69.00mm (67.23-60.62)
    • Fno. 4.10 (5.28-5.56)
    • Half angle ω = 41.68-31.65-17.41 ° (17.84-19.64)
    • Image height Y = 21.64mm
    • 134.65-141.04-164.94mm overall length of the lens (162.09-152.75)
    • BF 39.15-46.02-59.68mm (64.95-67.73)
    • β = -0.17 (-0.7)
  • Example 4
    • Macro when in parentheses
    • Zoom ratio 3.42 (2.84)
    • Focal length f = 24.30-35.10-82.99mm (68.22-64.03)
    • Fno. 3.58-4.42-5.89 (5.92-5.87)
    • Half angle ω = 41.68-31.65-14.61 ° (17.60-18.67)
    • Image height Y = 21.64mm
    • 126.64-128.32-155.92mm overall length of the lens (149.57-148.58)
    • BF 39.39-49.31-64.14mm (65.59-65.96)
    • β = -0.17 (-0.6)
  • Canon patents
    • (4, etc. as in Example 3) seven-group zoom of positive and negative positive and negative positive positive and negative
    • (4, etc. the second group, as in Example 3) inner focus
    • implement the macro function by the first group fed out to the object side

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

Untitled

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

Canon Patent For 70-400 f/4.5-5.6 Lens

2014_21256_fig05

Egami (translated) spotted another patent filed by Canon. It appears that Canon is working on a 70-400mm f/4.5-5.6 lens.

  • Patent Publication No. 2014-21256,2014-21257
    • Publication date 2014.2.3
    • Filing date 2012.7.18
  • Example 2
    • Zoom ratio 5.45
    • Focal length f = 71.33-144.71-388.95mm
    • Fno. 4.63-4.84-5.83
    • Half angle ω = 16.87-8.50-3.18 °
    • Image height Y = 21.64
    • 240.00-284.68-303.83mm overall length of the lens
    • BF 75.92-79.30-95.93mm
    • 6-group zoom of positive and negative positive and negative positive and negative
    • (Part of the fourth group) anti-vibration
    • Rear Focus (Group 6)

Canon Patent For Ring Flash With Prism For Uniform Light Distribution

Canon Patent

Egami (translated) spotted another patent filed by Canon, this time for a ring flash with a prism for an uniform distribution of the light.

  • Patent Publication No. 2014-13350
    • Publication date 2014.1.23
    • Filing date 2012.7.5
  • Existing ring strobe
    • Xenon tube
    • Process to bend the arc shaped glass tube cylindrical difficult
  • Canon patents
    • There are two areas in light of the strobe
    • Light flux from the first region is subject to direct
    • Toward the object light beam from the second zone enters the prism, and then reflected inside
    • Provided with a step stepped on the reflecting surface, by changing the pitch of the step, it is possible to adjust the distance between the emission point

More after the break.

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Canon Patent for Curved Diaphragm

Curved Diaphragm Curved Diaphragm

Egami (translated) spotted another patent filed by Canon (we had more Canon patents lately: 1 | 2 | 3).

The patent refers to the implementation of a curved diaphragm. I guess this could be very useful for miniaturization purposes. Is there another super-small DSLR like the Rebel Sl1 (price & specs) coming?

  • Patent Publication No. 2014-13363,2014-13365
    • Publication date 2014.1.23
    • Filing date 2012.6.6
  • Canon patents
    • The iris of the dome-shaped