Canon Patent For Various RF Mount Zoom Lenses

Canon Patent

Canon patent application US20190369372 discusses optical formulas for various zoom lenses for the Canon EOS R system.

Among the discussed optics in this Canon patent application is a 28-280mm f/2.8 lens. All lenses seem to be designed for the EOS R full frame mirrorless system.

A zoom lens includes, in order from an object side, a positive first unit, a negative second unit, a positive intermediate group consisting of one or two units and including a third unit located on a most object side, a negative unit, and a rear group consisting of one or two units including a positive unit located on a most object side. Conditional expressions are satisfied with respect to amounts of movement of the second and third units from a wide angle end to a telephoto end, a distance at the wide angle end from a most object side surface vertex in the first unit to a most object side surface vertex in the third unit, an Abbe number of a most object side lens in the first unit, a focal length of the second unit, and focal lengths at the wide angle end and at the telephoto end.

[…]

A zoom lens of the disclosure includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an intermediate lens group having a positive refractive power and including one or two lens units inclusive of a third lens unit located on an object side, a lens unit having a negative refractive power, and a rear lens group including one or two lens units inclusive of a lens unit which is located on the object side and has a positive refractive power, which are arranged in order from the object side to an image side. Here, an interval between every two adjacent lens units is configured to be variable for zooming. In the meantime, a total length of the zoom lens is reduced by keeping the first lens unit unmoved relative to an image plane while varying the intervals between the lens units during the zooming. The first lens unit includes three or more lenses and mainly corrects a spherical aberration and an axial chromatic aberration on a telephoto side. The second lens unit includes three or more lenses and mainly suppresses variations in curvature of field and in chromatic aberration of magnification during the zooming. In order to achieve correction of aberrations and reduction in size at the same time, it is preferable to form each of the first lens unit and the second lens unit by use of three or four lenses. 

canon patent

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Source: Canon News

Wireless Charging Might Come To Canon Cameras In The Future

Canon

Canon patent application US10375639 discusses technology to wireless charge a battery. Looking at the patent’s images, it seems that the patent clearly refers to wireless charging a camera’s battery.

Patent abstract:

A power transmission apparatus includes a communication unit that executes communication with an electronic apparatus, a power transmission unit that wirelessly supplies power to the electronic apparatus, and a control unit that controls communication and power supply to be executed alternately, wherein the control unit adjusts communication power of the communication unit and transmission power of the power transmission unit and/or a length of a communication period and a length of a power transmission period, so that an average magnetic field intensity does not exceed a first magnetic field intensity in a predetermined region throughout the communication period of communication executed by the communication unit and the power transmission period of power transmission executed by the power transmission unit.

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Canon Patent For A Lens Cap That Might Be Pretty Difficult To Lose

Canon Patent

Canon patent application 2019-113645 describes a design for a lens cap that might once for all solve the issue with lost lens caps.

The lens cap described in the Canon patent opens (and closes) without being removed form the lens. There is more: the lens cap is a lens cap when closed and becomes a lens hood when opened. Pretty smart.

The present invention works as a lens hood function at the time of shooting and as a lens protection function at the time of non-shooting, thus eliminating the need for lens cap attachment / removal and barrier opening / closing operations.

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Source: Canon News

Canon Researching How To Make IBIS and Lens IS Work Together Smoothly, Patent Suggests

Ibis Canon Rumors Canon Full Frame Mirrorless Canon PowerShot G7 X Canon Eos 90d

Canon patent application 2019-087397 (Japan) discusses how to make IBIS (In Body Image Stabilisation) work with lens-based image stabilisation. Not an easy task, I guess.

This is not the first IBIS-related patent filed by Canon. It’s now safe to assume that Canon will indeed implement IBIS in a future mirrorless camera (both EOS M and EOS R?).

Given the quantity of Canon lenses with IS it was to expect that Canon is interested to make IBIS wok with image-stabilised lenses.

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Latest Canon Patent Applications (celestial AF, improved viewfinder, IS on tilt-shift, telephoto)

Canon Patent

US Patent Application 20490158760 discusses how to get better autofocus performance when picturing objects in the sky, like the moon.

In recent years, the number of pixels in image capturing apparatuses such as cameras and videos has increased, a slight defocus state of an image has become conspicuous and, more precise focusing is desired. This is the same in shooting an image of celestial bodies (stars, moon, and so forth) in the night sky. 

Focusing on celestial bodies is performed by calculating a focus position at which an area represented by high brightness signals is strictly minimized when regarding each celestial body as a point light source. As stars and the moon which are subjects in astrophotography at night are located substantially at infinity and there are specific exposure settings for astrophotography, there is an independent shooting mode for astrophotography different from other scene modes. Hereinafter, a mode for shooting the moon as the main subject is referred to as a “moon shooting mode”. 

Normally, the focus position at which an object located substantially at infinity is in focus is uniquely determined by performing infinite focus adjustment in individual image capturing apparatus. However, due to a difference between temperature at a time of the infinite focus adjustment and temperature of the image capturing apparatus at a time of actually shooting a celestial body, a difference in posture, and so forth, the focus may shift during shooting. For this reason, it is necessary to often adjust focus even during shooting a celestial body whose distance from the image capturing apparatus does not substantially change during shooting. 


Japan Patent Application 2019-078959 describes am improved viewfinder which improves on aberrations and magnification while maintaining a long eyepoint.

[…] the focal length of the eyepiece is about 65 mm, and the finder magnification is about 0.8 or less when the standard lens with a focal length of 50 mm is mounted as a photographing lens. 
Therefore, in a camera using a so-called APS-C size sensor in which the size of the image circle is smaller than a 35 mm film, the finder image becomes smaller than the conventional silver halide film camera. 
Further, in the prior art disclosed in Patent Document 2, although the finder magnification is as high as about 1 time, it is difficult to sufficiently correct axial chromatic aberration and lateral chromatic aberration. 
Therefore, an object of the present invention, while increasing the magnification while maintaining high optical performance, is to provide a finder optical system capable of ensuring long eye point. 


Japan Patent Application 2019-078903 describes how to implement an image stabilisation system on a tilt-shift lens while also lowering the power consumption.

It is an object of the present invention to provide a lens apparatus capable of reducing the power consumption while being able to shoot under an eyebrow and correct the shake, and an image pickup apparatus using the same. 
To achieve the above object, a lens device of the present invention, 
  – an optical system comprising a plurality of lenses, 
  – the shake correction lens of the plurality of lenses the optical system A – driving unit for moving in a direction crossing the optical axis;

A tilt unit for tilting the optical system and a control unit for controlling the drive unit are provided, and the control unit is configured to make the tilt amount of the optical system generated by the tilt unit smaller than a predetermined tilt amount. When the first tilt amount and the shake amount applied to the optical system are the first shake amount larger than a predetermined shake amount, the shake correction lens is in a direction crossing the optical axis. The drive unit is controlled to move in a direction intersecting the optical axis with a first drive amount smaller than the maximum drive amount of the shake correction lens 
  According to the present invention, it is possible to provide an imaging apparatus using the lens apparatus and which capable of reducing power consumption as well as a possible tilt shooting and shake correction . 


Japan Patent Application 2019-078948 describes various optical formulas for telephoto lenses and how to reduce chromatic aberrations.

  • focal length 392.55 
  • f-number 2.90 
  • half angle of view 3.15 
  • image height 21.64 
  • total lens length 372.00 
  • BF 60.70 
  • focal length 292.46 
  • f-number 2.90 
  • half angle of view 4.23 
  • image height 21.64 
  • lens total length 273.98 
  • BF 62.03 
  • focal length 488.82 
  • F number 4.10 
  • half angle of view 2.53 
  • image height 21.64 
  • lens total length 411.90 
  • BF 71.62 
  • focal length 778.70 
  • F number 5.83
  • Half angle of view 1.59 
  • image height 21.64 
  • lens total length 486.03 
  • BF 71.54

US Patent Application 20190155003 describes optical formulas for more telephoto lenses. As with the previous patent application, here too reduction of chromatic aberrations is discussed.

In an ultra-telephoto lens, generally, the longer the focal length, the more axial chromatic aberration or magnification chromatic aberration occurs. As a technique for excellently correcting these types of chromatic aberration, a technique for increasing the number of lenses placed on an object side and causing the lenses to share the action of correcting chromatic aberration is known. However, the effective diameter of a lens placed on the object side of the ultra-telephoto lens is likely to be large. Thus, if an attempt is made to correct chromatic aberration by the above technique, the weight of an imaging optical system increases. 

Source: Canon News

Canon Might Have a 50mm f/1.8 and a 28mm f/1.8 For The EOS R System On Their Agenda, Patent Suggests

50mm F/1.8

Canon patent application 2019-0113711 (USA) describes the optical formula for an RF 50mm f/1.8 and RF 28mm f/1.8 lens, both for the Canon EOS R full frame mirrorless system.

Focal length 48.50
F-number 1.85
Half angle of view (degrees) 24.04
Image height 21.64
Total lens length 95.00 
BF 15.80

Focal length 28.80
F-number 1.85
Half angle of view (degrees) 36.91
Image height 21.64
Total lens length 80.30 
BF 7.00 

It’s likely Canon will launch these non-L lenses sooner than later. Both are popular focal lengths on full frame, and it’s also likely Canon is set to offer some less expensive (aka budget) lenses for the EOS R system.

More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production in the next few years are these:

Source: Canon News