A new Canon patent for two lenses with inner zoom mechanism. Canon patent application 2024079936 (Japan, published 6/13/2024) discusses optical formulas for two (likely RF-mount) lenses with an inner zoom, i.e. they do not extend or retract when zooming:

• 5-60mm f/2.8
• 22-80mm f/2.8

From the patent literature:

• A zoom lens that has a high zoom ratio and a large aperture ratio, yet is compact, lightweight, and provides high image quality, and that allows high-speed zoom operation.
• Background Art
  There is a demand for a zoom lens that is compact and lightweight throughout its entire system, has excellent correction of chromatic aberration and other aberrations, and has high optical performance. There is also 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. There is also a demand for a zoom lens that allows high-speed zoom operation.
• However, the zoom lens described in Patent Document 1 has a tendency to have a large lens diameter due to its small F-number, and the large front lens diameter leads to an increase in size and weight. In addition, if the refractive power of the second lens group is increased in order to reduce the front lens diameter, it becomes difficult to achieve high image quality.
• The present invention provides a zoom lens that has a high zoom ratio and a large aperture ratio, yet is compact, lightweight, and provides high image quality, and is capable of high-speed zoom operation.

Example 1

• Focal length: 24.72-101.86
• F-number: 2.90
• Half angle of view: 41.19-11.99
• Total length: 212.40
• Back Focus: 11.98-21.74

Example 2

• Focal length: 15.45-58.20
• F-number: 2.90
• Half angle of view: 41.5-13.2
• Image height:
• Overall length: 144.55
• Back focal length: 13.62

Example 3

• Focal length: 24.71-116.38
• F-number: 2.90
• Half angle of view: 41.3-10.0
• Image height:
• Overall length: 231.23
• Back focus: 11.38-23.01

Example 4

• Focal length: 22.60-82.99
• F-number: 2.90
• Half angle of view: 44.3-14.1
• Image height:
• Overall length: 216.25
• Back Focus: 11.83-22.33

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

More Canon patents are listed here.

[via asobinet]