Canon Patent: Switch Between Electronic And Dot-sight Viewfinder

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This seems a rather interesting and innovative Canon patent application. How about switching between dot-sight and electronic viewfinder?

Canon patent application 2022-23783 (Japan) discusses methods and technology for a device that allows to switch between dot-sight and electronic viewfinder. If you want to learn more about dot-sight, have a look here.

PROBLEM TO BE SOLVED: To provide a small display device capable of switching between a sight and an electronic viewfinder.

Conventionally, when a distant moving subject such as a bird or an airplane is photographed by using an image pickup device, a sighting device called a dot sight is widely used. Further, in an image pickup device equipped with a high-magnification lens, a display device such as an electronic viewfinder is widely used in order to enable stable shooting. Patent Document 1 discloses an image pickup apparatus including both an electronic viewfinder and a sighting device.

However, in the image pickup device disclosed in Patent Document 1, since the function of the sighting device and the function of the electronic viewfinder are realized by using different display devices, the size of the image pickup device becomes large.

The display device as one aspect of the present invention is arranged between the image display element, the eyepiece, the objective window, and the eyepiece and the objective window, and is displayed on the image display element. It has a reflective optical element that guides the image to the eyepiece, and the reflective optical element can switch between the first state and the second state by changing the transmission rate, and the first state. In, the image displayed on the image display element can be visually recognized through the eyepiece, and in the second state, the image from the objective window and the image through the eyepiece. It is possible to visually recognize an image in which an image displayed on the display element is superimposed.

According to the present invention, it is possible to provide a small display device and an image pickup device capable of switching between a sighting device and an electronic viewfinder.

Is this cool? Me thinks it is.

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: 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: