So many Canon patents for lenses have been being found lately that I am condensing 3 posts of lens patents into 1 below.
Canon 9-18mm F4 IS, 10-20mm F2.8-4 IS, and 11-22mm F2.8 IS patents found
overview
- [Publication number] P2024100498
- [Release date] 2024-07-26
- [Name of invention] Zoom lens and imaging device
- [Application date] 2023-01-16
- [Applicant]
[Identification number] 000001007
[Name or company name] Canon Inc. - A zoom lens that is compact yet has good optical performance even when vibration is reduced is provided.
- [Background Art]
[0002]
As an imaging optical system used in imaging devices such as digital still cameras, video cameras, broadcast cameras, and security cameras, there is a demand for an optical system that is small and lightweight and has high optical performance even if the amount of image blur correction is large. Patent Document 1 discloses a zoom lens having a subsequent lens group including a first lens group with negative refractive power, a second lens group with positive refractive power, and an anti-vibration lens group, which are arranged in order from the object side to the image side. The anti-vibration lens group performs OIS, which reduces (corrects) image blur caused by shaking of the imaging device due to hand shake or the like (hereinafter referred to as camera shake) by moving (shifting) in a direction perpendicular to the optical axis. In addition, the imaging element that captures the subject image formed by the imaging optical system can perform IIS, which corrects image blur by shifting in a direction perpendicular to the optical axis. - [0004]
In a central projection type imaging optical system, the amount of movement of an image point on an image plane due to camera shake differs between the center and the periphery of the image plane. In particular, the wider the angle of an imaging optical system, the greater the amount of movement of an image point in the periphery compared to the center. For this reason, in an ultra-wide-angle zoom lens with an angle of view exceeding 100°, a lot of image shake remains in the periphery. - In the zoom lens of Patent
Document 1, the curvature of field during vibration reduction is corrected, but a large amount of residual image blur occurs in the peripheral area due to the difference in the amount of image point movement between the center and the periphery. Also, in the IIS, if the outer diameter of the vibration reduction lens group is large, it becomes difficult to miniaturize the zoom lens. - The present
invention provides a zoom lens which is small in size and yet has good optical performance even during vibration reduction, and an imaging apparatus using the same.
Example 1
- Focal length: 10.33-19.39
- F-number: 4.08-4.12
- Half angle of view: 61.36-48.13
- Image height: 18.92-21.64
- Total length: 128.82-123.27
- Back Focus: 12.13
Example 2
- Focal length: 9.20-17.90
- F-number: 4.08-4.12
- Half angle of view: 64.04-50.40
- Image height: 18.90-21.64
- Overall length: 125.26-119.35
- Back Focus: 10.50
Example 3
- Focal length: 11.30-23.90
- F-number: 4.08-4.12
- Half angle of view: 59.29-42.15
- Image height: 19.02-21.64
- Total length: 129.79-129.33
- Back focus: 14.54-10.54
Example 4
- Focal length: 11.30-22.00
- F-number: 2.89
- Half angle of view: 59.44-44.52
- Image height: 19.14-21.64
- Overall length: 137.35-125.58
- Back focus: 13.50-10.50
Example 6
- Focal length: 10.30-19.80
- F-number: 2.89-4.12
- Half angle of view: 61.76-47.54
- Image height: 19.18-21.64
- Overall length: 132.94-127.01
- Back Focus: 11.35
Canon 12-30mm F4-6.3 and 24-50mm F4-6.3 power zoom patents found
overview
- [Publication number] P2024099414
- [Release date] 2024-07-25
- [Name of invention] Zoom lens and imaging device
- [Application date] 2023-01-12
- [Applicant]
[Identification number] 000001007
[Name or company name] Canon Inc. - A zoom lens is provided that has a wide angle of view, is compact, and has high optical performance while allowing rapid zooming.
- [Background Art]
[0002]
In recent years, there has been a demand for zoom lenses that are wide-angle, compact, and high-performance (high resolution). In addition, in recent years, the demand for moving images has increased, and in order to achieve smooth zooming, zoom lenses with electric zoom functions are required. As a wide-angle optical system, a negative lead type optical system is known. Patent Document 1 and Patent Document 2 disclose a negative lead type zoom lens in which the first lens group is immobile relative to the image plane during zooming. - SUMMARY OF THE PRESENT EMBODIMENTS
An object of the present invention is to provide a zoom lens which has a wide angle of view, is compact, has high optical performance, and is capable of rapid zooming.
Example 1
- Focal length: 14.40-29.10
- F-number: 4.10-6.26
- Half angle of view: 43.6-25.3
- Image height: 11.51-12.90
- Overall length: 78.75
- Back Focus: 11.50
Example 4
- Focal length: 24.70-48.50
- F-number: 4.10-6.14
- Half angle of view: 41.5-24.0
- Image height: 18.19-20.62
- Overall length: 107.48
- Back Focus: 20.26
Example 5
- Focal length: 12.36-27.16
- F-number: 4.10-6.40
- Half angle of view: 47.9-26.2
- Image height: 10.67-12.59
- Overall length: 79.81
- Back Focus: 11.50
Canon 14-30mm f/4-6.2, 24-50mm f/4-6.2, 12-28mm f/4-6.4 patents found
Focal length 14.40 21.16 29.10
F-number 4.10 5.18 6.26
Half angle of view 43.6 32.8 25.3
Image height 11.51 12.52 12.90
Lens length 78.75 78.75 78.75
BF 11.50 11.50 11.50
Focal length 24.70 35.00 48.50
F-number 4.10 5.07 6.14
Half angle of view 41.5 31.6 24.0
Image height 18.19 19.77 20.62
Lens length 107.48 107.48 1
BF 20.26 20.26 20.26
Focal length 12.36 20.00 27.16
F-number 4.10 5.40 6.40
Half angle of view 47.9 34.1 26.2
Image height 10.67 12.26 12.59
Lens length 79.81 79.81 79.81
BF 11.50 11.50 11.50