Canon 15-50mm F4-6.3 and 17-60mm F2.8-5.6 Patents
overview
- [Publication number] P2024173039
- [Release date] 2024-12-12
- [Name of invention] Zoom lens and imaging device having the same
- [Application date] 2023-06-01
- [Applicant]
[Identification number] 000001007
[Name or company name] Canon Inc. - The present invention provides a zoom lens that has high optical performance, a high zoom ratio, and is compact.
- 2. Description of the Related Art
In recent years, there has been a demand for zoom lenses having high optical performance, a high zoom ratio and a small size as imaging optical systems used in imaging devices.
Example 1
- Focal length: 15.20-49.50
- F-number: 4.12-6.45
- Half angle of view: 52.76-23.61
- Image height: 20.00-21.64
- Total length: 124.63-125.93
- Back focus: 15.00
Example 2
- Focal length: 17.20-64.50
- F-number: 4.00-5.60
- Half angle of view: 49.30-18.54
- Image height: 20.00-21.64
- Overall length: 132.16-165.51
- Back Focus: 15.00-21.72
Example 3
- Focal length: 17.22-64.50
- F-number: 2.82-5.60
- Half angle of view: 49.27-18.54
- Image height: 20.00-21.64
- Total length: 138.48-159.38
- Back Focus: 14.69-24.38
Canon 21mm F5.6, 24mm F8, and 26mm F3.5 Patents
overview
- [Publication number] P2024172505
- [Release date] 2024-12-12
- [Name of invention] Optical system and imaging device having the same
- [Application date] 2023-05-31
- [Applicant]
[Identification number] 000001007
[Name or company name] Canon Inc. - An optical system that is compact yet has good optical performance from the center to the periphery of the screen is provided.
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2. Background Art
In optical systems used in imaging devices using solid-state imaging elements, such as digital still cameras and video cameras, there is a demand for lenses that are compact yet have good optical performance from the center of the screen to the periphery. - [0005]
However, if the refractive power of each positive lens is increased in order to further miniaturize the optical system of Patent Document 1, it becomes difficult to satisfactorily correct the curvature of field, and as a result, there is a risk that sufficient optical performance cannot be obtained at the periphery of the screen. - [0006]
It is therefore an object of the present invention to provide an optical system which is compact yet has good optical performance from the center of the image plane to the periphery.
Example 1
- Focal length: 21.40
- F-number: 5.60
- Half angle of view: 45.31
- Image height: 21.64
- Total length: 25.80
- Back focus: 12.00
Example 2
- Focal length: 23.29
- F-number: 8.00
- Half angle of view: 42.90
- Image height: 21.64
- Total length: 26.00
- Back focus: 12.00
Example 3
- Focal length: 26.30
- F-number: 3.20
- Half angle of view: 39.45
- Image height: 21.64
- Overall length: 35.00
- Back Focus: 14.99
Example 6
- Focal length: 28.07
- F-number: 3.50
- Half angle of view: 37.62
- Image height: 21.64
- Total length: 36.50
- Back focus: 15.00
Example 7
- Focal length: 24.29
- F-number: 4.10
- Half angle of view: 41.69
- Image height: 21.64
- Overall length: 31.00
- Back focus: 15.00