Canon Patent: 24-130mm F4 IS and 24-80mm F2.8 IS

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Here is a new Canon patent application for two zoom lenses.

Canon patent application 2024160458 (Japan, published 11/14/2024) discusses optical formulas for two zoom lenses:

  • 24-130mm F4 IS
  • 24-80mm F2.8 IS

From the patent literature:

  • To obtain a compact zoom lens having a bright F-number, a high zoom ratio, and high optical performance.
  • Background Art: Zoom lenses used in imaging devices such as those described above are required to have high performance with minimal aberrations and high resolution up to high spatial frequencies. In such zoom lenses, the degradation of optical characteristics due to diffraction cannot be ignored. Since the degradation of imaging performance due to diffraction is determined by the F-number of the zoom lens, zoom lenses are required to have a bright open F-number (large aperture ratio). Also, in order to reduce noise when imaging in dark places, a bright F-number is required throughout the entire zoom range. Furthermore, zoom lenses are required to be compact and to have a high zoom ratio.

Example 1

  • Focal length: 24.72-130.99
  • F-number: 4.08-4.12
  • Half angle of view: 37.84-9.38
  • Image height: 19.20-21.64
  • Total length: 127.91-182.91
  • Back focus: 11.19-47.32

Example 2

  • Focal length: 24.72-82.44
  • F-number: 2.88-2.91
  • Half angle of view: 37.91-14.71
  • Image height: 19.25-21.64
  • Total length: 141.91-178.40
  • Back focus: 12.29-33.22

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Canon Patent: 200-1000mm F6.3-9 IS Lens For RF Mounts

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Here is a new Canon patent application.

Canon patent application 2024111453 (Japan, published 8/19/2024) discusses optical formulas for a telephoto zoom lens, the 200-1000mm F6.3-9 IS.

Example 1

  • Focal length: 203.00-776.00
  • F-number: 6.42-9.18
  • Half angle of view: 6.08-1.60
  • Image height: 21.64
  • Total length: 331.63-421.61
  • Back Focus: 37.98-96.27

Example 2

  • Focal length: 203.00-699.99
  • F-number: 5.60-7.10
  • Half angle of view: 6.08-1.77
  • Image height: 21.64
  • Total length: 347.80-447.80
  • Back Focus: 38.65-94.84

Example 3

  • Focal length: 158.88-600.00
  • F-number: 5.89-9.18
  • Half angle of view: 7.75-2.07
  • Image height: 21.64
  • Overall length: 332.30-447.10
  • Back focus: 38.50-92.00

Example 4

  • Focal length: 199.98-980.38
  • F-number: 6.43-9.18
  • Half angle of view: 6.17-1.26
  • Image height: 21.64
  • Total length: 362.79-482.80
  • Back focus: 38.64-100.15

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Canon Patent: RF 28-70mm F2.8 Lens

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Canon patent application 2024104916 (Japan, published on August 6, 2024) discusses various optical formulas for a yet to be released RF lens: 28-70mm f2.8.

From the patent literature:

  • Description of the Related Art: In recent years, imaging optical systems used in imaging devices have been required to have high optical performance, a high zoom ratio, and a small size.
  • The zoom lens of Patent Document 1 has a lens group arranged in the order of positive, negative, positive, positive, negative, positive, from the object side to the image side. However, since the refractive power of the second lens group is strong, the chromatic aberration of magnification at the wide-angle end tends to become large, and the fluctuation of the curvature of field occurring during zooming tends to become large .
  • SUMMARY OF THE PRESENT EMBODIMENTS: An object of the present invention is to provide a zoom lens which has high optical performance, a high zoom ratio and is compact.

Example 1

  • Focal length: 28.80-67.90
  • F-number: 2.88-2.92
  • Half angle of view: 34.93-17.67
  • Image height: 21.64
  • Total length: 132.38-158.83
  • Back Focus: 15.39-34.87

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Canon Patent: 15-28mm F2.8 And 17-30mm F2.8 Lenses

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Canon patent application 2024101615 (Japan, published 7/30/2024) discusses optical formulas for two lenses:

  • 15-28mm F2.8
  • 17-30mm F2.8

From the patent literature:

  • A zoom lens that is compact yet has a wide angle of view and good optical performance over the entire zoom range.
  • [Background Art]There is a demand for a compact, wide-angle zoom lens as an imaging optical system used in imaging devices such as single-lens reflex cameras, video cameras, broadcast cameras, and silver-halide film cameras. As such a zoom lens, Patent Documents 1 and 2 disclose a zoom lens that is composed of a first lens group with negative refractive power, a second lens group with positive refractive power, and a subsequent lens group, which are arranged in this order from the object side to the image side.
    In a negative-lead type zoom lens, in order to miniaturize the entire system while achieving a wide angle of view and high optical performance, it is important to properly arrange the lens groups that make up the zoom lens, and the configuration and power arrangement of the first lens group are particularly important.
  • The present invention provides a zoom lens that is compact yet has a wide angle of view and good optical performance over the entire zoom range, and an image pickup apparatus using the same.

Example 1

  • Focal length: 15.488-27.160
  • F value: 2.900
  • Half angle of view: 54.532-38.744
  • Image height: 17.550-20.460
  • Total length: 140.161-129.964
  • Back focal length: 13.270

Example 2

  • Focal length: 16.482-27.299
  • F value: 2.900
  • Half angle of view: 52.826-38.443
  • Image height: 18.100-20.460
  • Total length: 141.472-132.922
  • Back Focus: 14.138

Example 3

  • Focal length: 17.423-31.170
  • F value: 2.900
  • Half angle of view: 51.201-34.556
  • Image height: 18.100-20.430
  • Overall length: 153.392-141.859
  • Back focal length: 13.330

Canon Patent: 180mm F3.5 Macro, 300mm F4 Macro, And 100mm F4 Macro

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Canon patent application 2024103311 (Japan, published 08/01/2024) discusses method and optical formulas for three telephoto macro lenses:

  • 180mm F3.5 Macro
  • 300mm F4 Macro
  • 100mm F4 Macro

From the patent literature:

  • An optical system that is compact overall and has a small and lightweight focus lens group is provided.
  • [Background Art]In optical systems called macro lenses (microlenses) used for close-up photography, a floating method in which two or more lens groups are moved during focusing is often adopted in order to suppress aberration fluctuations during focusing. Another focusing method is the inner focus method in which focusing is performed by moving an intermediate group of the optical system.
  • In order to reduce the size and weight of the lens group used for focusing, it is important not only to adopt the inner focus method but also to appropriately configure the lens group arranged on the object side of the focus lens group and the lens group used for focusing. In addition, in order to reduce the size of the optical system and reduce aberration fluctuations during focusing, it is important to appropriately set the arrangement, refractive power, and movement amount of the lens group arranged on the object side of the focus lens group and the focus lens group. In the optical systems of Patent Documents 1 and 2, none of these are appropriately set, and the size of the optical system and the size and weight of the focus lens group are not sufficiently reduced.
  • The present invention provides an optical system which is small overall, has a small and lightweight focus lens group, and has high optical performance over the entire object distance, and an image pickup apparatus equipped with the same.

Example 1

  • Focal length: 179.96
  • F-number: 3.60
  • Half angle of view: 6.86
  • Image height: 21.64
  • Overall length: 171.15
  • Back focal length: 26.35
  • Magnification: -1.0

Example 2

  • Focal length: 299.99
  • F-number: 4.12
  • Half angle of view: 4.12
  • Image height: 21.64
  • Total length: 210.00
  • Back focal length: 38.69
  • Magnification: -1.0

Example 3

  • Focal length: 188.87
  • F-number: 4.00
  • Half angle of view: 6.53
  • Image height: 21.64
  • Total length: 188.87
  • Back focal length: 32.67
  • Magnification: -2.0

Example 4

  • Focal length: 235.51
  • F-number: 4.12
  • Half angle of view: 5.25
  • Image height: 21.64
  • Total length: 202.50
  • Back focal length: 66.52
  • Magnification: -1.0

Example 5

  • Focal length: 110.03
  • F-number: 4.12
  • Half angle of view: 11.12
  • Image height: 21.64
  • Overall length: 110.03
  • Back focal length: 17.52
  • Magnification: -1.0
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Canon Patent: 400-600mm F2.8-4, 300-600mm F2.8-4.5 And 70-300mm F4

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Here is the next Canon patent application.

Canon patent application 2024101302 (Japan published 7/29/2024) discusses optical formulas for three telephoto/zoom lenses:

  • 400-600mm F2.8-4
  • 300-600mm F2.8-4.5
  • 70-300mm F4
  • A zoom lens that is small in size and has a large aperture while still providing high optical performance.
  • [Background Art]In recent years, there has been a demand for a telephoto lens with a zoom function, which is small and has a large aperture, yet has high optical performance. Patent Document 1 discloses an optical system having a plurality of converter lenses, which is composed of a first to third lens group with positive, negative, and positive refractive powers, and a subsequent group including one or more lens groups, which are arranged in order from the object side to the image side, in order to achieve weight reduction and telephotography. Patent Document 2 discloses an optical system having a first and second lens group with positive and negative refractive powers, and a subsequent group including one or more lens groups, which are arranged in order from the object side to the image side, in order to achieve both size reduction and high image quality, and the first lens group is composed of a plurality of subgroups. Patent Document 3 discloses an optical system having a first lens group with positive refractive power, a second lens group, and a subsequent group including one or more lens groups, which are arranged in order from the object side to the image side, in order to achieve both improved optical performance and weight reduction, and which ensures an air gap in the first lens group.
  • However, in the optical system of Patent Document 1, the refractive power of the first lens group and the second lens group are optimized to achieve compactness, and it is also possible to achieve telephotography using multiple converter lenses, but it is difficult to achieve compactness when the image sensor is large. In the optical system of Patent Document 2, the spacing between the main variable magnification groups can be changed during zooming, or the number of lenses in the main variable magnification groups can be increased to achieve high image quality, but it is difficult to achieve a large aperture. In the optical system of Patent Document 3, the configuration of each lens group is optimized to achieve both weight reduction and suppression of chromatic aberration, but it is difficult to achieve compactness when the aperture is large.
  • An object of the present invention is to provide a zoom lens which is small in size and has a large aperture, yet provides high optical performance .

Example 1

  • Focal length: 409.335-582.738
  • F-number: 2.880-4.100
  • Half angle of view: 3.025-2.126
  • Image height: 21.635
  • Total length: 475.002
  • Back focus: 39.500

Example 2

  • Focal length: 306.239-582.535
  • F value: 2.900-4.600
  • Half angle of view: 4.041-2.127
  • Image height: 21.635
  • Total length: 475.001
  • Back focal length: 41.785

Example 3

  • Focal length: 71.997-291.389
  • F-number: 4.120
  • Half angle of view: 16.725-4.246
  • Image height: 21.635
  • Total length: 276.801-332.801
  • Back Focus: 39.493-64.844

Example 4

  • Focal length: 101.052-291.652
  • F-number: 4.120
  • Half angle of view: 12.084-4.242
  • Image height: 21.635
  • Total length: 279.187-308.962
  • Back Focus: 39.496-52.523