Here is a new Canon patent application, as usual for RF-mount lenses. Canon patent application…
Canon Patent: Wide-angle Fixed Lens For 1″ Imaging Sensor (PowerShot?)
A new Canon patent for a wide-angle single focus lens for a camera with an 1 inch imaging sensor. A new PowerShot camera?
Canon patent application 2023-140823 (Japan, published 10/5/2023) discusses optical formulas for a 28mm-35mm equivalent wide angle lens for a camera with an 1 inch imaging sensor.
From the patent literature:
Optical system and imaging device having the same
The present invention provides an optical system that is compact and has high optical performance, and an imaging device that includes the same.
BACKGROUND OF THE INVENTION
In recent years, with the miniaturization and increase in the number of pixels of image pickup devices, optical systems used in image pickup devices are required to be small and have high optical performance.
Problems to be Solved by the Invention
The optical system described in Patent Document 1 uses a telephoto type power arrangement to reduce the overall length, and uses a plurality of aspheric lenses to reduce distortion and image plane. Curvature is being corrected. However, in the optical system described in Patent Document 1, the Petzval sum of the entire system is large and the incident angle of the off-axis light beam is also large, so when trying to apply it to an imaging device with a large imaging element, it is difficult to correct field curvature or reduce the amount of peripheral light. Decrease is an issue.
Example 1
- Focal length: 13.82
- F value: 2.88
- Half angle of view: 29.72
- Image height: 7.89
- Total length: 16.32
- Back focus: 4.83
Example 2
- Focal length: 17.20
- F value: 2.06
- Half angle of view: 24.65
- Image height: 7.89
- Total length: 21.52
- Back focus: 5.22
Example 3
- Focal length: 12.64
- F value: 2.91
- Half angle of view: 31.97
- Image height: 7.89
- Total length: 15.87
- Back focus: 4.19
Example 4
- Focal length: 10.39
- F value: 2.55
- Half angle of view: 37.20
- Image height: 7.89
- Total length: 15.65
- Back focus: 4.54
More Canon patents are listed here.
[via asobinet]
Related Posts
