Here is a new Canon patent application. Does the patent refer to the Canon RF 24-70mm f/2.8L IS?

Canon patent application 2024078721 (Japan, published 6/11/2024) discusses optical formulas for a 28-70mm f/2.8 IS lens.

From the patent literature:

• The present invention provides a compact zoom lens that has a high zoom ratio, good optical performance over the entire zoom range from the wide-angle end to the telephoto end, and has a large aperture and an image stabilization mechanism.
• Background Technology
  In recent years, zoom lenses used in imaging devices such as digital cameras using solid-state imaging elements and silver halide film cameras are required to be small in size, have high optical performance, have a large aperture, and be equipped with an image stabilization mechanism (anti-vibration mechanism).
• In order to achieve this, it is important to appropriately set the zoom type of the zoom lens and the lens group that moves during zooming.
• The present invention provides a compact zoom lens that has a high zoom ratio and good optical performance over the entire zoom range from the wide-angle end to the telephoto end, has a large aperture, and has an image stabilization mechanism.

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A new Canon patent for two lenses for mirrorless cameras, one for APS-C and the other for full-frame. Both have inner zoom mechanism.

Canon patent application 2024076793 (Japan, published 6/6/2024) discusses optical formulas for two lenses with inner zoom:

• 12-30mm f4-6.3 IS (APS-C)
• 20-40mm f/4 IS (full-frame)

From the patent literature:

• An object of the present invention is to provide a negative lead type wide-angle zoom lens that is small and lightweight and has high optical performance over the entire zoom range.
• BACKGROUND ART In recent years, it has been desired that an imaging optical system used in an imaging device be a small zoom lens that has a wide angle of view and has high optical performance over the entire zoom range.
• Patent Document 1 discloses a negative lead type wide-angle zoom lens in which a first lens group with a negative refractive power is disposed closest to the object side as a zoom lens whose entire system is small and whose angle of view can be easily widened. Proposed.
• The negative lead type wide-angle zoom lens proposed in Patent Document 1 widens the angle of view by moving the first lens group with negative refractive power when zooming from the wide-angle end to the telephoto end. It achieves high optical performance.
• However, the configuration in which the first lens group, which is large and has a large mass, is moved, as in the wide-angle zoom lens described in Patent Document 1, complicates the movement mechanism and is disadvantageous from the viewpoint of miniaturization and weight reduction.
• The present invention provides a negative lead type wide-angle zoom lens that is compact and lightweight, yet has high optical performance over the entire zoom range.

Example 1

• Focal length: 12.42-29.07
• F value: 4.10-6.40
• Half angle of view: 47.72-25.17
• Image height: 11.37-13.66
• Total length: 82.97
• Back focus: 12.29

Example 2

• Focal length: 14.40-29.10
• F value: 4.10-6.29
• Half angle of view: 43.40-25.14
• Image height: 11.46-13.17
• Total length: 75.06
• Back focus: 11.78

Example 3

• Focal length: 20.60-39.00
• F value: 4.10
• Half angle of view: 46.40-29.01
• Image height: 17.94-20.74
• Total length: 97.01
• Back focus: 12.68

Example 4

• Focal length: 20.60-48.50
• F value: 4.10-5.88
• Half angle of view: 46.40-24.04
• Image height: 18.22-21.64
• Total length: 106.52
• Back focus: 19.41

More Canon patents are listed here.

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Here is a new Canon patent application, one for a RF-S and one for a RF lens.

Canon patent application 2024072459 (Japan, 5/28/2024) discusses optical formulas for two RF-mount lenses:

• RF-S 14-30mm f/4-6.3 [for APS-C imaging sensors]
• RF 20-50mm f/4-5.6

From the patent literature:

• The present invention provides a zoom lens that is both compact and lightweight and has high image quality, has a short focal length at the wide-angle end, is easy to manufacture, is inexpensive, and allows high-speed zoom operations.
• BACKGROUND ART
  Zoom lenses used in imaging devices are required to be small and lightweight, have various aberrations including chromatic aberration well corrected, and have high optical performance. Additionally, there is a demand for a zoom lens that has a short focal length at the wide-angle end, is easy to manufacture, and is inexpensive. Furthermore, there is a demand for a zoom lens that allows high-speed zoom operations.
• In order to provide such a zoom lens, the arrangement of the aspherical lens is important. If an aspherical lens is placed in the second lens group, which is placed adjacent to the image side of the first lens group closest to the object and has a high axial ray height, the required precision of the aspherical lens will be high, making it difficult to manufacture. As the power increases, it becomes difficult to provide an inexpensive zoom lens. On the other hand, if an aspherical lens is not disposed in the second lens group, it will be difficult to suppress aberrations generated in the second lens group, making it difficult to achieve high image quality. Furthermore, in order to provide a zoom lens that can realize high-speed zoom operations, it is effective to fix the first lens group with a large lens diameter and move only the lens group with a small lens diameter. However, by fixing the first lens group closest to the object, aberration correction deteriorates and it becomes difficult to achieve high image quality.
• Patent Document 1 describes a compact and lightweight zoom lens that includes a first lens group with negative refractive power, a second lens group with positive refractive power, and a second lens group with negative refractive power, which are arranged in order from the object side. A zoom lens has been proposed that includes a third lens group and a fourth lens group with positive refractive power. The first lens group is fixed relative to the image plane during zooming.
• The present invention provides a zoom lens that is both compact and lightweight and has high image quality, has a short focal length at the wide-angle end, is easy and inexpensive to manufacture, and allows high-speed zoom operations.

Example 1

• Focal length: 14.40-29.10
• F value: 4.10-6.40
• Half angle of view: 43.4-25.1
• Total length: 75.06
• Back focus: 11.78

Example 3

• Focal length: 12.40-29.10
• F value: 4.10-6.40
• Half angle of view: 47.9-25.2
• Total length: 82.67-82.67
• Back focus: 11.71

Example 3

• Focal length: 20.60-48.50
• F value: 4.10-5.88
• Half angle of view: 46.4-24.2
• Total length: 106.52-106.52
• Back focus: 19.41

More Canon patents are listed here.

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A new Canon patent application for two telephoto lenses.

Canon patent application 2024062200 (japan, published 5/9/2024) discusses optical formulas for two telephoto lenses for the RF mount:

• 200-800mm f/6.3-9
• 150-600mm f/6.3-9

From the patent literature:

• An object of the present invention is to provide a zoom lens that has high optical performance, a high zoom ratio, and is small and lightweight.
• [Background Art] In recent years, imaging optical systems used in imaging devices are required to be small and lightweight zoom lenses that have a long focal length at the telephoto end and have high optical performance over the entire zoom range.
• According to the present invention, it is possible to provide a zoom lens that has high optical performance, has a high zoom ratio, and is small and lightweight.

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Here is a new Canon patent application, this time for. 14-35mm f/2.8 lens for the RF mount and full frame cameras.

Canon patent application 2024058439 (Japan, published 4/25/2024) discusses optical formulas for a 14-35mm f/2.8 lens.

From the patent literat

• An object of the present invention is to provide a negative lead type wide-angle zoom lens that is compact, is equipped with an anti-vibration group, and has high optical performance over the entire zoom range.
• BACKGROUND ART In recent years, zoom lenses used in imaging devices are desired to have a wide angle of view, high optical performance over the entire zoom range, and be compact. Patent Document 1 discloses a negative lead type zoom lens in which a lens group with negative refractive power is arranged on the object side as a zoom lens whose entire system is compact and can easily widen the angle of view.
• The present invention provides a negative lead type wide-angle zoom lens that is compact, is equipped with an anti-vibration group, and has high optical performance over the entire zoom range.

Example 1

• Focal length: 14.42-33.91
• F value: 2.88
• Half angle of view: 52.67-32.54
• Image height: 18.91-21.64
• Total length: 154.50-145.20
• Back focus: 17.88-37.9

More Canon patents are listed here.

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Here is a new Canon patent application, as usual for RF-mount lenses.

Canon patent application 2024042622 (japan, published 3/28/2024) discusses optical formulas for two lenses for full frame mirrorless cameras (i.e. fort he RF-mount):

• 12-24mm f/2.8
• 14-20mm f/2

From the patent literature:

• An object of the present invention is to provide an ultra-wide-angle zoom lens that is compact and provides high optical performance over the entire object distance range.
• [ Background Art] As an imaging optical system, an imaging lens with a half angle of view of more than 50 degrees at the wide-angle end is called an ultra-wide-angle lens, and among them, a bright lens with an F value of 2.8 or less has a wide Suitable for taking advantage of the angle of view and short shutter speed for shooting starry skies and dark places. Such an ultra-wide-angle lens is required to have high resolution performance that suppresses spherical aberration and sagittal flare over a short distance from an infinite subject. Particularly in zoom lenses, there has been a problem in that it is difficult to reduce the size of the lens while suppressing variations in aberrations from the wide-angle end to the telephoto end.
• However, the zoom lens disclosed in Patent Document 1 has a large F value and cannot sufficiently reduce aberration fluctuations during zooming due to an increase in aperture. The zoom lens of Patent Document 2 reduces aberration fluctuations during zooming by having multiple groups compared to the zoom lens of Patent Document 1, but there is a need for a wider angle and a smaller size.
• An object of the present invention is to provide an ultra-wide-angle zoom lens that is compact and provides high optical performance over the entire object distance.

Example 1

• Focal length: 12.29-23.80
• F value: 2.93
• Half angle of view: 60.39-42.27
• Image height: 21.64
• Total length: 138.05-134.83
• Back focus: 13.86-19.48

Example 2

• Focal length: 14.30-21.50
• F value: 2.06
• Half angle of view: 56.54-45.18
• Image height: 21.64
• Total length: 148.04-139.46
• Back focus: 13.87-20.30

More Canon patents are listed here.

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