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Canon Patent: 35mm f/1.3 Lens With Very Short Back Focus

Canon Patent

A new Canon patent was spotted. Will this lens ever hit the shelves? Unlikely in our opinion.

Canon patent application 2023077336 (Japan, published 6/5/23) discusses optical formulas for a 35mm f/1.3 lens.

An object of the present invention is to realize an optical system capable of reducing ghosts in a desired wavelength region in spite of having a large aperture and a small lens.

BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to an optical system and the like, and is suitable for imaging apparatuses such as digital video cameras, digital still cameras, broadcast cameras, surveillance cameras, cameras for wearable devices, and cameras for mobile devices.

2. Description of the Related Art
There is a demand for a high-performance optical system that reduces the occurrence of ghosts and flares. In order to reduce the occurrence of ghosts and flares, a method of providing an antireflection film on the lens surface is known.
In recent years, optical systems have become larger in diameter and smaller in size, and the opening angle of lenses tends to increase. However, due to problems in manufacturing the antireflection film, the antireflection effect in the periphery of the lens with a large opening angle may be inferior to the antireflection effect in the position on the optical axis.

SUMMARY OF THE INVENTION

Accordingly, it is an object of the present invention to provide an optical system capable of reducing ghosts, particularly in a desired wavelength region, while having a large aperture and a small lens.

Example 1

  • Focal length: 12.40
  • F-value: 1.30
  • Half angle of view: 32.82
  • Image height: 8.00
  • Overall length: 21.76
  • Back focus: 0.44

Example 2

  • Focal Length: 33.53
  • F-value: 1.30
  • Half angle of view: 32.83
  • Image height: 21.64
  • Overall length: 61.97
  • Back focus: 0.29

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

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