Canon Patent: 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender 1.4x

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A new Canon patent application was spotted. 400mm f/4 DO IS Extender 1.4x and 600mm f/4 IS Extender 1.4x are discussed.

Canon patent application 2022-22771 discusses optical formulas for two rather interesting lenses:

  • 400mm f/4 DO IS Extender 1.4x
  • 600mm f/4 IS Extender 1.4x

PROBLEM TO BE SOLVED: To provide an optical system in which a magnification conversion optical group can be inserted and removed and the total length is short.

As a method of changing the focal length of the optical system used for imaging, there is a method of inserting a magnification conversion optical group such as an extender into the optical path . Further, as an optical system in which the total length (distance from the optical surface on the object side to the image surface) does not change due to the insertion / removal of the magnification conversion optical group, Patent Document 1 describes the axial light beam between the aperture stop and the image surface. An optical system capable of inserting and removing a magnification conversion group at a converging position is disclosed.

However, if a space for inserting the magnification conversion optical group is provided between the aperture diaphragm and the image plane as in Patent Document 1, the total length of the original optical system becomes long . Further, if the magnification conversion optical group is inserted in a narrow space, various aberrations of the optical system may increase. The
present invention provides an optical system in which a magnification conversion optical group can be inserted and removed, but the total length is short and good optical performance can be obtained.

Example 1

  • Focal length: 392.58
  • F value: 4.12
  • Half angle of view: 3.15
  • Image height: 21.64
  • Overall length: 280.33
  • Back focus: 36.01

Example 1 (with inserted teleconverter)

  • Focal length: 549.72
  • F value: 5.77
  • Half angle of view: 2.25
  • Image height: 21.64
  • Overall length: 280.33
  • Back focus: 36.00

Example 5

  • Focal length: 585.00
  • F value: 4.12
  • Half angle of view: 2.12
  • Image height: 21.64
  • Overall length: 467.45
  • Back focus: 55.50

Example 5 (with inserted teleconverter)

  • Focal length: 819.18
  • F value: 5.77
  • Half angle of view: 1.51
  • Image height: 21.64
  • Overall length: 467.45
  • Back focus: 55.50

The Canon patent application was spotted by asobinet.com. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Canon Patent: Externally Connected Camera Cooling Device

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Well, that’s a somewhat different Canon patent application for once.

Canon patent application 2022-21539 (Japan) discusses methods and technology to connect an external camera cooling device.

PROBLEM TO BE SOLVED: To provide an externally connected electronic device for cooling that can be connected to an image pickup device.

The present invention relates to an electronic device, and more particularly to an electronic device that can be externally connected to an image pickup device and dissipate heat to the image pickup device. However, in the technique described in Patent Document 1, by arranging the ventilation duct inside the image pickup device, a large space for installing the blower duct is required, which may hinder the miniaturization of the image pickup device. The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an externally connected electronic device that can be connected to an image pickup apparatus.
In order to solve the above problems, the present invention comprises an interface unit including a connection unit that can be attached to the external device by connecting to an interface terminal provided in the external device, a heat transfer unit, a heat dissipation unit, and the like . The electronic device is characterized in that the heat transfer section and the heat dissipation section are connected to the interface section, and the interface section is in the opposite direction to the external device when the interface section is connected to the external device. offer.

If we got it right, it is an external cooling device that can be attached to the camera and connected to an USB port. We think the device has a Peltier element and a fan. It can be attached when needed, so it can be seen as a portable camera cooling device.

The camera depicted in the drawings appears to be a mirrorless camera, and pretty much looks like an EOS M camera. Canon planing to release an overheating EOS M model? :-)

The Canon patent application was spotted by asobinet.com. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Canon Patent: 200-500mm f/4 and 300-800mm f/8 Lenses

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A new Canon patent was spotted. The patent refers to two super zoom lenses. Again, as it seems, for the RF mount

Canon patent application 2022/0035144 (USA) discusses optical formulas for a 200-500mm f/4 lens and a 300-800mm f/8 lens. Other lenses discussed in the patent literature are 200-400mm f/4 and 150mm f/5 – 600mm f/6.5. These too might be for the RF mount.

Example 1

  • Focal length: 206.00-485.01
  • F value: 4.09-4.10
  • Half angle of view: 6.00-2.55
  • Image height: 21.64
  • Overall length: 486.99
  • Back focus: 53.96

Example 3

  • Focal length: 154.55-585.00
  • F value: 5.10-6.51
  • Half angle of view: 7.97-2.12
  • Image height: 21.64
  • Overall length: 288.00-388.00
  • Back focus: 15.00-95.75

Example 4

  • Focal length: 205.00-390.00
  • F value: 4.10
  • Half angle of view: 6.02-3.18
  • Image height: 21.64
  • Overall length: 367.09
  • Back focus: 46.68

Example 5

  • Focal length: 305.00-774.99
  • F value: 8.09-8.10
  • Half angle of view: 4.06-1.60
  • Image height: 21.64
  • Overall length: 489.78
  • Back focus: 100.04

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

[via asobinet.com]

Canon Patent: RF 20mm f/1.8, RF 24mm f/1.8, RF 28mm f/1.8 Lenses

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A new Canon patent application, once more for RF mount lenses.

Canon patent application 2022-20096 (Japan) discusses optical formulas for a bunch of RF mount lenses: RF 20mm f/1.8, RF 24mm f/1.8, RF 28mm f/1.8.

From the patent literature:

PROBLEM TO BE SOLVED: To provide an optical system having good optical performance, easy to manufacture and compact. However, when the optical system of Patent Document 1 is widened, the off-axis aberration increases as the angle of view increases. In order to satisfactorily correct the increased off-axis aberration, it is necessary to arrange a lens having a large diameter in the front group, which is the focus group, on the object side, which leads to an increase in the size of the optical system. Furthermore, since the mass of the focus group also increases, a high-output actuator is required when performing autofocus, which may lead to an increase in the size of the actuator. An object of the present invention is to provide an optical system having good optical performance, easy to manufacture, and a small size, and a lens device and an image pickup device having the same.

Example 1

  • Focal length: 28.60
  • F value: 1.85
  • Half angle of view: 37.1
  • Image height: 20.15
  • Overall length: 81.00
  • Back focus: 13.20

Example 2

  • Focal length: 20.60
  • F value: 1.85
  • Half angle of view: 46.4
  • Image height: 18.71
  • Overall length: 84.87
  • Back focus: 11.00

Example 3

  • Focal length: 24.72
  • F value: 1.85
  • Half angle of view: 41.2
  • Image height: 19.34
  • Overall length: 81.00
  • Back focus: 11.00

The patent application was spotted by asobinet.com. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Canon Patent: RF-S 16-55mm f/2.8 & RF 28-70mm f/2.8 Lenses

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A new Canon patent application suggests there might be some truth to the rumor about an EOS R model with APS-C sensor.

Canon patent application 2022-18006 (Japan) discusses optical formulas for an RF-S 16-55mm f/2.8 lens for crop sensor, and RF 28-70mm f/2.8 lens for full-frame sensors.

Example 1

  • Focal length: 16.50-53.81
  • F value: 2.90
  • Half angle of view: 42.26-13.98
  • Image height: 14.00
  • Overall length: 103.55-129.89
  • Back focus: 14.18-10.01

Example 3

  • Focal length: 24.97-232.79
  • F value: 4.12-6.40
  • Half angle of view: 41.55-5.03
  • Image height: 19.45-21.64
  • Overall length: 140.70-210.70
  • Back focus: 12.99-52.16

Example 4

  • Focal length: 28.84-67.79
  • F value: 2.90
  • Half angle of view: 34.71-16.22
  • Image height: 19.00-21.64
  • Overall length: 141.90-158.37
  • Back focus: 12.51-27.26

The patent application was spotted by asobinet.com. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these:

Canon Patent: RF 100mm f/2 Macro Lens (EOS R system)

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And yet another Canon patent application for an RF mount lens. A new macro lens might be in the works.

Canon patent application 2022-16822 discusses optical formulas for a RF 100mm f/2 Macro lens.

PROBLEM TO BE SOLVED: To provide an optical system which is small in size, suppresses aberration fluctuation due to focusing, and can obtain high optical performance over an entire object distance from infinity to a close distance, and an image pickup apparatus having the same.

A macro lens whose main purpose is to shoot a short-range object is configured to be capable of shooting from an infinite object having a shooting magnification of 0 times to a short-range object having a shooting magnification of about 1x. desirable. Further, the macro lens is required to have low aberration fluctuation and high optical performance over the entire object distance at the time of focusing, and the focus lens group is small and lightweight in order to perform focusing at high speed. When the inner focus method and the floating method are used, it becomes easy to perform focusing at high speed, reduce aberration fluctuations due to focusing, and obtain high optical performance over all object distances from infinity to close range.

Example 1

  • Focal length: 97.00
  • F value: 2.06
  • Half angle of view: 12.57
  • Image height: 21.64
  • Overall length: 159.46
  • Back focus: 19.70
  • Shooting magnification: -1.0

The patent application was spotted by asobinet.com. More Canon patent applications are listed here. Some particularly interesting patent applications we think might get into production are these: