Canon Patents « Canon Rumors

Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6

More Patents
A couple of new lens formula patents which seems to address lowering chromatic aberrations in a new way

Patent Publication No. 2012-163746

2012.8.30 Release Date
2011.2.7 filing date

Example 4

Zoom ratio 4.67
56.11 – - 131.85mm f = 28.21 focal length
Fno 4.12 -. 4.89 – 5.77
Half angle of view ω = 37.48 – 21.09 – 9.32deg.
Image height 21.64mm
242.67 – - 266.43mm 224.00 overall length of the lens
BF 55.79 – 70.40 – 82.95mm
20 sheets of 14 group lens configuration
Two two-sided aspherical
Three low-dispersion glass
Four Super UD glass
102.40mm effective diameter of the first surface
5-group zoom negative positive negative

Example 5

Zoom ratio 10.31
93.64 – - 307.06mm f = 29.77 focal length
Fno 3.31 -. 4.71 – 5.85
Half angle of view ω = 36.00 – 13.01 – 4.03deg.
Image height 21.64mm
263.66 – - 304.01mm 209.34 overall length of the lens
BF 61.72 – 89.40 – 106.84mm
18 sheets 12 groups lens configuration
Three 3 aspherical surface
Three low-dispersion glass
2 UD glass sheets
84.36mm effective diameter of the first surface
5-group zoom negative positive negative
In the zoom lens of the positive lead type, reducing the chromatic aberration of magnification of the secondary

Source: [EG]

cr

Patent: Canon EF 300 f/4L IS II

New Patent
Canon has filed a patent for the optical formula of a new EF 300 f/4L IS II.

Patent Publication No. 2012-159726

2012.8.23 Release Date
2011.2.1 filing date

Example 3

F = 300mm focal length
Fno. 4.0
Tele ratio 0.68
Inner Focus
φr = 68.8mm
φg1 = 67.8mm
φg2 = 70.2mm

Canon EF 300 f/4L IS at B&H Photo

Technical background

When the miniaturization of the optical system, longitudinal chromatic aberration, chromatic aberration of magnification is remarkable
As the focal length becomes longer, the telephoto lens system, chromatic aberration is noticeable
There is a method of correcting the aberrations of a material having an anomalous dispersion resin, the resin is difficult to produce high-precision thick
There is a method of sandwiching a thin glass resin material, the bonding peeling distortion problem bonding at high temperature

Canon patent

Joining three or more optical elements
The outer diameter of the resin is increased to reduce the distortion at the time of bonding
Not adhere to each other resin outer glass element
Between the optical element of the outside is gone, adhesive, the thickness of the adhesive distribution occurs
Using a sealing agent to prevent change in shape of the resin and the refractive index change due to moisture absorption
Do the black outer peripheral portion of the glass element
Prevent flare and ghosting resin at the outer periphery
Surface resin glue is not good

Source: [EG]

cr

Patent – EF 135 f/2.8 & 180 f/3.5 with Apodization Filter

New lens patents
A new patent showing two lenses, the 135 f/2.8 and 180 f/3.5 has appeared. The interesting part of these patents is something called a apodization filter on the lenses. This improves the bokeh performance of the lenses.

EF 135 f/2.8

Could either of these lens patents translate into a new 135 f/2L or 180 f/3.5L Macro? Only time will tell.

Patents – EF 600 f/5.6 DO & 800 f/5.6 DO

More diffractive optics
Canon seems to still invest significant money into developing their diffractive optics technology. Currently Canon has 2 DO lenses, the very good 400 f/4 DO IS and the decent 70-300 DO IS.

EF 600mm f/5.6 DO

Making long lenses that are smaller and lighter will always be desired, especially with the boom in digital cinema cameras and wildlife photography.

More patents have appeared, one for a 600 f/5.6 DO and another for an 800 f/5.6 DO. The 800 would measure a miniscule 46cm in length.

EF 800mm f/5.6 DO

Chances of coming to market? I think it’s a pretty solid bet we’re going to see new DO lenses announced sometime. When? Your guess is as good as mine.

Source: [EG]

cr

Patent – Canon EF 24-70 f/2.8L IS

You want IS?
A patent for an EF 24-70 f/2.8L IS has surfaced finally, this has been a lens that has been talked about and desired for a long time.

We mentioned some time back that there were 5 or 6 version of the new 24-70, and one of them had IS. Canon decided against an IS version for reasons to do with weight, size and cost from what I’m told.

Sadly for the ones that want an IS version of this lens, I have little faith that such a lens will be coming any time soon. Patents can sometimes appear after a product has been announced, and that’s probably what has happened here.

Canon EF 24-70 f/2.8L IS

Patent Publication No. 2012-123156

2012.6.28 Release Date
2010.12.8 filing date

Example 1

Zoom ratio 2.46
68.99mm – f = 28.00 focal length
Fno. 2.88
17.41 deg – 37.69 half angle of view.
Image height 21.64mm
222.38mm – 192.25 full-length lens
BF 39.98 – 53.68
Effective diameter 74.47mm ball before
Effective diameter aperture 31.23mm
19 sheets 12 group lens configuration
Three three aspherical surface
2 UD glass sheet

Example 2

Zoom ratio 2.86
68.70 – f = 24.00 focal length
Fno. 2.88
17.48 deg – 42.03 half angle of view.
Image height 21.64mm
224.86mm – 191.93 full-length lens
BF 39.85 – 55.68mm
Effective diameter 77.29mm ball before
Effective diameter aperture 32.58mm
Lens Construction 12 group 21 sheets
Three three aspherical surface
2 UD glass sheet
Five-group zoom positive and negative positive positive and negative
(For Focusing group 2) Inner Focus
(Part 1 of the fourth lens group, anti-vibration unit is L4a) image stabilization

Source: [EG]

cr

Patent: 24-1060mm Zoom Lens

That’s a 44x Zoom
Canon has published a patent for a zoom lens with an equivalent focal length of 24-1060. That’s a 44x zoom for those that are counting. Could we see this in the next SX PowerShot camera? A good possibility.

Patent Publication No. 2012-98699

2012.5.24 Release Date
2010.10.7 filing date

Example 7

Zoom ratio 44.28
13.08 – - 190.43mm f = 4.30 focal length
Fno 2.87 – 5.00 – 7.07
16.50 – - 1.17 deg 37.77 a half angle of view.
3.88 – - 3.88mm 3.33 image height
93.62 – - 137.94mm 94.49 lens length
BF 1.00mm
13 pieces in 10 groups Lens Construction
Two four-sided aspherical
3 UD glass sheet
One fluorite
Group 4 consists of positive and negative positive positive
(For Focusing the fourth lens group) Rear focus

Source: [EG]

cr

Patent: 600 f/4 DO IS & 400 f/2.8 DO IS

Patent Time!
More diffractive optic patents from Canon. This time, another 600 f/4 IS DO lens and a 400 f/2.8 DO IS.

With the cost of the new super telephotos from Canon, I can’t imagine what new DO lenses would cost.

Continue reading for the patent breakdown….

Patent Publication No. 2012-88427

2012.5.10 Release Date
2010.10.18 filing date

Example 1

Focal length f = 585.00mm
Fno 4.12
Image height 21.64mm
Length 468.50mm lens
BF 90.78mm
15 sheets of 9 group lens configuration
One aspherical surface a
2 UD glass sheet
One fluorite
A plane diffraction

Example 2

Focal length f = 391.86mm
Fno 2.88
Image height 21.64mm
Length 367.51mm lens
BF 50.01mm
Lens Construction 14 elements in 9 groups sheet
2 2 aspherical surface
1 UD glass sheet
One fluorite
A plane diffraction
Group 3 consists of positive and negative positive
Inner Focus (group 2)
Strengthen the refractive power of the front lens group, and to shorten the overall length, the sensitivity is increased, it is difficult to manufacture and assembly
The number of lens group at the end of the super-telephoto lens is determined by the balance of the total length and chromatic aberration
And shorten the length and reconcile, the correction of chromatic aberration, the number will increase
It is important to the length of each degree
Weight of the first lens group, 70% to 9 on the whole
Canon patents is reduced to three the first group
Aspherical and one eye in group 1 group, field curvature correction, the distortion
Diffractive optical element and the second two groups in the first group, the chromatic aberration correction

Source: [EG]

Patent: New Diffractive Optic Patents

$Patent: New Diffractive Optic Patents$

More DO Lenses?
A few patents in regards to diffractive optics have come about. 70-300 f/4.5-5.6 DO IS, 14 f/2.8 DO and a 600 f/4 DO IS.

Diffractive optic patents keep coming up, though no new products are being announced. It does appear Canon is invested in the technology and thinks there is a market for it. I am a big fan of the 400 DO and hope to see longer DO lenses in the future.

Read more about the patents after the break.

Patent Publication No. 2012-78397

2012.4.19 Release Date
2010.9.30 filing date

Example 1

Zoom ratio 4.01
135.50 – - 290.90mm 72.50 focal length
Fno 4.66 -. 4.97 – 5.87
9.07 – - 4.25deg 16.62 a half angle of view.
Image height 21.64mm
171.47 – - 204.08mm 144.08 full-length lens
BF 40.08mm
18 sheets 12 group lens configuration
3 UD glass sheet
A plane diffraction
Seven-group zoom positive and negative positive positive and negative polarity
Inner Focus (Group 6)
Shake correction (group 2)

Example 2

Zoom ratio 2.84
200.00 – - 292.50mm 103.00 focal length
Fno 4.67 -. 5.44 – 5.77
6.17 – - 4.23deg 11.86 a half angle of view.
Image height 21.64mm
189.12 – - 210.66mm 162.16 full-length lens
BF 45.16 – 58.25 – 70.16mm
13 pieces in 11 groups Lens Construction
2 UD glass sheet
A plane diffraction
Five-group zoom of positive and negative positive positive and negative
Rear focus

Example 3

14.36mm focal length
Fno. 2.89
56.38deg half angle of view.
Image height 21.60mm
Length 133.66mm lens
BF 38.47mm
16 pieces in 10 groups Lens Construction
2 UD glass sheet
Two surface diffraction
Two positive lens group a negative
(Part of the front group) Inner Focus

Example 4

584.94mm focal length
Fno. 4.12
2.12deg half angle of view.
Image height 21.64mm
Length 404.06mm lens
BF 123.32mm
18 sheets 12 group lens configuration
3 UD glass sheet
One fluorite
Two groups of positive-positive lens
(Part of the front group) Inner Focus

Conventional diffractive optical element

Because there is a thick diffraction grating, and obliquely incident light, the diffraction efficiency is reduced
When the diffraction efficiency is reduced, flare, ghost, imaging performance deterioration, such as contrast degradation occurs

Canon’s patent

Can be in close contact with another medium to a diffraction grating, to reduce the thickness
Capable of suppressing a decrease in diffraction efficiency
With another medium, and fine particle dispersion ultraviolet curing resin material

cr

Patent: Canon EF 2.8x Teleconverter

Patent Time
A patent showing a new teleconverter has made an appearance. It appears to be a 2.7 or 2.8x TC. What effect woud it have on aperture? A 400 f/2.8L IS II would become 1120mm at f/8. All well and good, but the missing f/8 autofocus on the 1D X makes this one a bit strange with the current line of camera bodies.

Patent Publication No. 2012-47869

2012.3.8 Release Date
2010.8.25 filing date

Example 1

-83.98mm focal length
Expansion rate β = 1.996
Lens Construction 5 group nine

Example 3

-41.91mm focal length
Expansion rate β = 2.779
Lens Construction 5 group nine

Canon’s patent

Rear converter is to increase the focal length, F number, the residual aberration
When doubled, twice the lateral aberration, longitudinal aberration is 4 times greater rate of expansion, because the F-number is also double, longitudinal aberration is twice per depth of focus
Rear converter configuration consisting of three groups of positive and negative positive
Reduce the aberration of the rear converter itself

Source: [EG]

cr

Patent: Tamron 70-200 f/2.8 VC

Another new 70-200 f/2.8
It looks like Tamron is going to be refreshing their 70-200 f/2.8 with a new version. The new version will add Tamron’s vibration correction as well as a new optical design.

2012-58619,2012-58620 Patent Publication No.

2012.3.22 Release Date
2010.9.10 filing date

Example 1

111.5353 – - 194.0928mm f = 71.5336 focal length
Fno 2.9
20.71 – - 12.48 deg 34.66 angle of view.
Magnification ratio 2.713
18 sheets 13 group lens configuration
Three three aspherical surface
3 ED glass sheet
Super ED lens equivalent to 1 XLD glass sheets and fluorite ※

Tamron’s patent

Positive-positive four-group zoom of positive and negative
Inner Focus
Focusing for the third lens group
Made compact and lightweight AF speed of the focus group
Lens consists of a single sheet of focus group
Inner zoom
Shake correction
For anti-vibration part of the fourth lens group
Compact, lightweight unit
By a small amount of shift in anti-vibration, energy saving

Source: [EG]

cr

Review – Canon EF 300mm f/2.8L IS II

Review – Canon EF 85 f/1.2L II

Review – Canon EF 24-70 f/2.8L II

Review – Canon EF 200 f/2L IS

Archive for the ‘Canon Patents’ Category

Patents: 28-135 f/4-5.6 & 28-300 f/3.5-5.6

Patent: Canon EF 300 f/4L IS II

Patent – EF 135 f/2.8 & 180 f/3.5 with Apodization Filter

Patents – EF 600 f/5.6 DO & 800 f/5.6 DO

Patent – Canon EF 24-70 f/2.8L IS

Patent: 24-1060mm Zoom Lens

Patent: 600 f/4 DO IS & 400 f/2.8 DO IS

Patent: New Diffractive Optic Patents

Patent: Canon EF 2.8x Teleconverter

Patent: Tamron 70-200 f/2.8 VC

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