Canon Patent: 800mm f/5.6 IS, 1000mm f/8 IS And 1200mm f/8 IS Lenses

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A new Canon patent application. Canon patent application 2023107573 (Japan, published 8/3/2023) discusses optical formulas for three telephoto lenses:

  • 800mm f/5.6 IS
  • 1000mm f/8 IS
  • 1200mm f/8 IS

From the patent literature:

An object of the present invention is to provide an optical system in which various aberrations are satisfactorily corrected while being compact and lightweight, and an imaging apparatus having the optical system.

Description of the Related Art

A telescopic optical system used in an imaging apparatus is required to have a long focal length and a small F-number (large aperture). Patent Documents 1 and 2 disclose a first lens group with positive refractive power, a second lens group with positive or negative refractive power, and a third lens group with positive or negative refractive power, which are arranged in order from the object side to the image side. An optical system is disclosed, consisting of lens groups, with a second lens group moving during focusing.

Here, it is also desired that the telescopic optical system be compact and lightweight, and that various aberrations such as chromatic aberration and spherical aberration are well corrected. However, when trying to increase the aperture of a telescopic optical system, the effective diameter of the lens arranged on the object side becomes particularly large, making it difficult to reduce the size and weight of the entire system. Therefore, in order to realize the above-mentioned demands, it is important to appropriately set the optical arrangement of each lens group that constitutes the optical system, and the refractive power and arrangement of each lens that constitutes each lens group.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an optical system in which
various aberrations are satisfactorily corrected while being compact and lightweight, and an imaging apparatus having the optical system.

Example 1

  • Focal length: 820.00
  • F-value: 5.90
  • Half angle of view: 1.51
  • Image height: 21.64
  • Total length: 437.08
  • Back focus: 88.12

Example 2

  • Focal length: 1180.10
  • F-value: 8.00
  • Half angle of view: 1.05
  • Image height: 21.64
  • Total length: 550.00
  • Back focus: 140.36

Example 3

  • Focal length: 1000.0
  • F-value: 8.00
  • Half angle of view: 1.24
  • Image height: 21.64
  • Total length: 477.48
  • Back focus: 115.01

More Canon patents are listed here.

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Canon Patent: RF 24-300mm f/2.8-5.6 IS, RF 24-240mm f/2-5.6 IS And RF 40-350mm f/2.8-5.6 IS

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And another Canon patent for lenses for the RF mount.

Canon patent application 2023104137 (Japan, published 7/28/2023) discusses optical formulas for three zoom lenses for the RF mount:

  • RF 24-300mm f/2.8-5.6 IS
  • RF 24-240mm f/2-5.6 IS
  • RF 40-350mm f/2.8-5.6 IS

From the patent literature:

A zoom lens, an imaging device having the same, and an imaging system

To provide a zoom lens that is compact as a whole, has a high zoom ratio, and has high optical performance over the entire zoom range.

BACKGROUND ART

In recent years, there has been a demand for a zoom lens used in an imaging apparatus having an imaging device to have a compact overall system, a high zoom ratio, and high resolution (high optical performance). . In particular, zoom lenses are required to have high optical performance with substantially uniform resolving power from the center of the screen to the periphery of the screen.

However, in the zoom lenses disclosed in Patent Documents 1 and 2, since the relationship between the refractive powers of the lens groups is not appropriate, the lens size increases when the zoom ratio is increased, and astigmatism at the wide-angle end and coma at the telephoto end gets worse.

The present invention provides a zoom lens that is compact overall, has a high zoom ratio, and has high optical performance over the entire zoom range.

More Canon patents are listed here.

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Canon Patent: RF 300mm f/2.8 IS And RF 400mm f/2.8 IS

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And yet another Canon patent application: two telephoto fast primes for the RF mount.

Canon patent application 2023104022 (Japan, published 7/28/2023) discusses optical formulas for two fast telephoto prime lenses for the RF mount: RF 300mm f/2.8 IS and RF 400mm f/2.8 IS.

From the patent literature:

Optical System and Imaging Device Having the Same

Description of the Related Art

An optical system used in an imaging apparatus is required to be compact and lightweight as a whole, and to have high optical performance capable of satisfactorily correcting various aberrations including chromatic aberration. As a compact optical system, a so-called telephoto type optical system is known in which a lens group with positive refractive power is arranged on the object side and a lens group with negative refractive power is arranged on the image side. However, in the telephoto type optical system, the longer the focal length, the larger the entire system, and the use of a lens with a large diameter or a heavy lens tends to increase the weight of the entire optical system.

Example 1

  • Focal length: 294.99
  • F-value: 2.90
  • Half angle of view: 4.19
  • Image height: 21.64
  • Overall length: 280.25
  • Back focus: 37.47

Example 2

  • Focal length: 390.00
  • F-value: 2.90
  • Half angle of view: 3.18
  • Image height: 21.64
  • Overall length: 370.50
  • Back focus: 37.00

More Canon patents are listed here.

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Canon Patent: RF 15mm f/2 And RF 12mm f/2.8 Lenses

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And here is another Canon patent application, for two RF mount lenses.

Canon patent application 023104029 (Japan, 7/28/2023) discusses optical formulas for two fast prime lenses for the RF mount: RF 15mm f/2 and RF 12mm f/2.8.

From the patent literature:

Optical System and Imaging Device Having the Same

A wide-angle lens is provided that is compact and lightweight, and provides a high optical performance in which fluctuations in aberration due to focusing are suppressed while a high photographing magnification can be obtained at the time of photographing at the shortest distance.

Description of the Related Art

In recent years, there has been a demand for wide-angle lenses used in imaging apparatuses that are compact as a whole and that are capable of obtaining a high photographing magnification at the time of photographing at the shortest distance. In addition, there is a demand for a lens having high optical performance in focusing from infinity to the closest object.

In a wide-angle lens, in order to obtain a high photographing magnification at the time of photographing at the shortest distance, it is necessary to increase the amount of movement of the focus lens group, which makes it difficult to reduce the size of the entire lens. In order to reduce the amount of movement of the focus lens group, it is necessary to increase the refractive power of the focus lens group.

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Canon Patent For Built-In Tilting Viewfinder

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A new Canon Patent application describing a built-in tilting viewfinder which should also tale less space for implementation.

Canon patent application 2023104712 (Japan, published 7/28/2023) describes methods and technology for a tiltable viewfinder for an EOS R series camera body. From the patent literature:

[Title of the invention] Viewfinder unit, imaging device

Canon Inc. An object of the present invention is to suppress an increase in the size of an electronic device while securing a large rotation angle of a finder portion.

Description of the Related Art

Conventionally, a viewfinder unit provided in an electronic device such as an imaging device is known. For example, in an electronic device having a viewfinder unit such as an electronic viewfinder, the viewfinder unit is arranged on the upper part of the back side of the electronic device body. The finder section of the finder unit can be slid out from the main body of the electronic device, and the finder section can be tilted and rotated upward from the pulled out state, thereby increasing the degree of freedom in shooting posture.

However, in Patent Document 1, since the distance between the contact position of the pair of leaf springs with respect to the base plate and the rotation axis of the holder is long, the contact position moves so as to draw a large arc locus during rotation. . If the finder section rotates excessively, the leaf spring section will come off the fixed plate, so there is a restriction on the rotation angle of the finder section. On the other hand, if an attempt is made to design the rotation angle to be large, it is necessary to enlarge the fixing plate, which leads to an increase in the size of the imaging apparatus main body.

SUMMARY OF THE INVENTION

It is an object of the present invention to suppress an increase in the size of an electronic device while ensuring a large rotation angle of a viewfinder.

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

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Canon Patent: RF 135mm f/1.8L IS USM Lens For The EOS R Camera System

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And yet another Canon patent application for an RF-mount lens.

Canon patent application 2023099390 (Japan, published 7/13/2023) discusses optical formulas for what appears to be an RF 135mm f/1.8L IS USM lens.

From the patent literature:

Optical System and Imaging Device Having the Same

An object of the present invention is to provide an optical system equipped with an anti-vibration group that achieves both miniaturization and high anti-vibration performance, and an imaging apparatus having the optical system.
Telephoto lenses equipped with anti-vibration groups are required to achieve both miniaturization and high anti-vibration performance . In the telephoto lens equipped with the anti-vibration group of Patent Document 1, the anti-vibration performance is ensured by arranging the anti-vibration group at a position slightly away from the image plane position toward the object side, but it is difficult to reduce the size.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide an optical system equipped with a vibration reduction group that achieves both miniaturization and high vibration reduction performance, and an imaging apparatus having the optical system.

Example:

  • Focal length: 130.98
  • F-value: 1.85
  • Half angle of view: 9.38
  • Image height: 21.64
  • Total length: 147.99
  • Back focus: 17.45

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

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