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

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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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A new Canon patent application for two lenses featuring Canon’s new silent USM zoom technology (hence the “Z”).

Canon patent application 2024025100 (Japan, published 02/26/2024) discusses optical formulas and methods for two zoom lenses:

• RF 24-105mm f/2.8 Z
• RF 15-60mm f/2.8 Z

From the patent literature:

• The present invention provides a zoom lens that is compact, has a high zoom ratio, and a large aperture ratio, yet achieves high image quality and high-speed zoom operation.
• BACKGROUND ART: As a zoom lens used in an imaging device, there is a demand for a zoom lens that is small and lightweight, and has high optical performance that can satisfactorily correct various aberrations such as chromatic aberration. Additionally, there is a demand for a zoom lens that has a short focal length at the wide-angle end, a large zoom ratio, a small F number, a large aperture ratio, and is easy to manufacture. Additionally, there is a demand for a zoom lens that allows high-speed zoom operations. Patent Document 1 discloses a zoom lens that includes, in order from the object side to the image side, a lens group with positive refractive power, a lens group with negative refractive power, and a rear group having a plurality of lens groups. .
• Although the zoom lens disclosed in Patent Document 1 is small, has a high zoom ratio, and a large aperture ratio, it is difficult to achieve high image quality and high-speed zoom operation.
• Accordingly, an object of the present invention is to provide a zoom lens that is compact, has a high zoom ratio, and a large aperture ratio, yet achieves high image quality and high-speed zoom operation.

Example 1

• Focal length: 24.72-101.86
• F value: 2.90
• Half angle of view: 41.19-11.99
• Image height:
• Total length: 212.40
• Back focus: 11.98-21.74

Example 2

• Focal length: 15.45-58.20
• F value: 2.90
• Half angle of view: 41.48-13.21
• Image height:
• Total length: 143.99
• Back focus: 11.90

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A new Canon patent application. Canon patent 2024023099 (Japan, published 2/21/2024) discusses optical formulas for three wide angle zoom lenses.

• 10-20mm f/4
• 10-20mm f/2.8-4
• 9-18mm f/4

From the patent literature:

• An object of the present invention is to provide a zoom lens that is small and has good optical characteristics, and an imaging device and an imaging system including the zoom lens.
• BACKGROUND ART: Zoom lenses used in imaging devices are required to have a wide angle of view, be compact, and have good optical characteristics. As a wide-angle zoom lens, a so-called negative lead type zoom lens in which a lens group with a negative refractive power is arranged closest to the object side is known.
• A negative lead type zoom lens has the characteristics that it is relatively easy to widen the angle of view and easily obtain a long back focus. However, negative lead type zoom lenses tend to have an asymmetrical lens configuration with respect to the aperture stop. Therefore, it is difficult to correct various aberrations, for example, it is difficult to suppress aberration fluctuations during focusing, and it is very difficult to obtain high optical performance.
• In particular, in the inner focus type, in which focusing is performed using a small and lightweight lens group located closer to the image side than the first lens group in order to perform high-speed focusing, aberration fluctuations during focusing tend to increase.
• The present invention provides a zoom lens that is compact and has good optical characteristics, and an imaging device and an imaging system having the zoom lens.

Example 1

• Focal length: 10.33-19.39
• F value: 4.08-4.12
• Half angle of view: 61.36-48.13
• Image height: 18.92-21.64
• Total length: 128.82-123.27
• Back focus: 12.13

Example 2

• Focal length: 9.20-17.90
• F value: 4.08-4.12
• Half angle of view: 64.04-50.40
• Image height: 18.90-21.64
• Total length: 125.26-119.35
• Back focus: 10.50

Example 3

• Focal length: 11.30-23.90
• F value: 4.08-4.12
• Half angle of view: 59.29-42.15
• Image height: 19.02-21.64
• Total length: 129.79-129.33
• Back focus: 14.54-10.54

Example 4

• Focal length: 10.30-19.80
• F value: 2.89-4.12
• Half angle of view: 61.76-47.54
• Image height: 19.18-21.64
• Total length: 132.94-127.01
• Back focus: 11.35

More Canon patents are listed here.

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