Canon Patent: 70-150mm F1.8 Lens With Inner Zoom

Here is a new Canon patent application for a 70-150mm F1.8 lens (70-200mm F2.8 and 70-150mm F2 lenses are also mentioned in the patent literature)

Canon patent application 2024-154138 (Japan, published 10/30/2024) discusses optical formulas and methods for a 70-150mm F1.8 lens with inner zoom mechanism.

From the patent literature:

• To provide a large-aperture zoom lens that is compact yet has high optical performance.
• In recent years, in digital still cameras and video cameras, the number of pixels in solid state image sensors such as CCD and CMOS sensors has increased, and therefore optical systems used in image pickup devices using these image sensors are required to have high optical performance. Furthermore, large-aperture zoom lenses are required to take advantage of the blur effect.
• If the diameter of the zoom lens of Patent Document 1 is increased further, the positive lens group in the focus group will become larger in the outer diameter direction, making it difficult to sufficiently miniaturize the zoom lens by using an actuator or the like that is arranged on the outer periphery of the positive lens group.

Example 1

• Focal length: 72.10-145.50
• F-number: 2.05
• Half angle of view: 16.70-8.46
• Image height: 21.64
• Overall length: 227.00
• Back Focus: 13.99

Example 2

• Focal length: 72.10-194.00
• F-number: 2.91
• Half angle of view: 16.70-6.36
• Image height: 21.64
• Total length: 221.00
• Back Focus: 17.04

Example 3

• Focal length: 72.10-145.50
• F-number: 1.89
• Half angle of view: 16.70-8.46
• Image height: 21.64
• Total length: 240.00
• Back focal length: 14.34

More Canon patents are listed here.

[via asobinet]