Patents for a Canon 50mm F1.5 and Canon 32mm F0.75 lens were found
overview
- [Publication number] P2025040503
- [Release date] 2025-03-25
- [Title of invention] Optical system and imaging device
- [Application date] 2023-09-12
- [Applicant]
[Identification number] 000001007
[Name or company name] Canon Inc. - A compact optical system and an imaging device having high optical performance over a wide focus range are provided.
- [Background Art]
[0002]
In recent years, the importance of miniaturizing optical systems has increased due to the spread of smartphones and the shift from single-lens reflex cameras to mirrorless cameras in the high-end camera market. Patent Document 1 discloses a compact optical system (polarized reflective imaging system) equipped with a polarizing element and a half mirror. - [0004]
The optical system disclosed in Patent Document 1 has a dark F-number of 2.85. Because the polarized reflective imaging system has a structure in which the amount of light when randomly polarized light is incident is 1/8, it is necessary to make the F-number brighter than that of a normal optical system. In addition, the optical system disclosed in Patent Document 1 does not have good aberrations when focusing and cannot increase the shooting magnification, so it is not possible to achieve high optical performance over a wide focus range. - SUMMARY OF THE PRESENT EMBODIMENTS [0005]
It is therefore an object of the present invention to provide a compact optical system having high optical performance over a wide focus range. - EFFECT OF THE PRESENT DISCLOSURE
According
to the present invention, it is possible to provide a compact optical system having high optical performance over a wide focus range.
Example 1
- Focal length: 48.00
- F-number: 1.50
- Half angle of view: 24.26
- Image height: 21.64
- Back focus: 0.10
Example 2
- Focal length: 32.00
- F-number: 0.75
- Half angle of view: 24.37
- Image height: 14.50
- Back focus: 0.10
Example 3
- Focal length: 32.00
- F-number: 0.95
- Half angle of view: 24.38
- Image height: 14.50
- Back focus: 0.10
Example 4
- Focal length: 21.65
- F-number: 0.95
- Half angle of view: 33.81
- Image height: 14.50
- Back focus: 0.11
Example 7
- Focal length: 17.38
- F-number: 0.95
- Half angle of view: 39.84
- Image height: 14.50
- Back focus: 0.10
Example 15
- Focal length: 100.00
- F-number: 2.00
- Half angle of view: 7.70
- Image height: 13.52
- Back focus: 0.10
Example 24
- Focal length: 35.50
- F-number: 0.95
- Half angle of view: 31.36
- Image height: 21.64
- Back focus: 0.10
Example 25
- Focal length: 50.00
- F-number: 0.95
- Half angle of view: 23.40
- Image height: 21.64
- Back focus: 0.10
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