Canon patent for EF 600mm f/4 IS DO lens

jpa_428200685_000002

That may become a killer lens if it ever goes to production. Canon files a patent for a n EF 600mm f/4 IS DO lens. “DO” stays for diffractive optics.

Will this lens eventually replace the existing EF 600mm f/4L IS II? Not necessarily. DO optics are usually of smaller size than their counterparts without DO, so the lens referred in the patent could well be an addition to the line-up.

  • Patent publication number 2016-200685
    • Release date 2016.12.1
    • Application date 2015.4.9
  • Example 1
    • Focal length 585.00
    • F number 4.12
    • Half angle of view (degree) 2.12
    • Image height 21.64
    • Lens total length 335.32
    • BF 66.92
[via Egami]

Canon patent for augmented Optical Viewfinder (OVF)

canon patent

Another Canon patent for an optical viewfinder able to display all sorts of information. This is not the first patent of this kind, or that refers to viewfinder technology: 1 | 2 | 3

  • Patent publication number 2016 – 191759
    • Release date 2016.11.10
    • Application date 2015.3.31
  • Canon patent
    • Provide the variable reflectance mirror in the optical path of the finder optical system
    • In-screen information display is superimposed and displayed via reflectance variable mirror

canon patent

Excerpt from the patent literature:

[Claim(s)] [Claim 1] In a finder internal display which displays an information display in a screen on an object image in a finder in piles via a variable reflectance mirror,
A camera, wherein the aforementioned variable reflectance mirror has a finder internal display which can change reflectance and transmissivity arbitrarily.
[Claim 2] The camera according to claim 1 provided with a finder which has an optical system which observes an image formed on a focusing plate with a taking lens via an image inversion optical system and an ocular optical system.
[Claim 3] The camera comprising according to claim 2:
A photometry optical system which measures a luminosity of an image formed on the aforementioned focusing plate.
A finder optical system setting up transmissivity and reflectance of the aforementioned variable reflectance mirror from an output of the aforementioned photometry optical system.

[Claim 4] It has an amount setting-out means of information display light in a screen to set a light volume ratio of the aforementioned information display in a screen to an object image in the aforementioned finder, The camera according to claim 3 provided with a finder optical system setting up transmissivity and reflectance of the aforementioned variable reflectance mirror from a preset value of the aforementioned amount setting-out means of information display light in a screen.
[Claim 5] The camera according to claim 2 providing the aforementioned camera with line of sight detection equipment which detects the direction of a look of an observer whom a finder observes, and setting up transmissivity and reflectance of the aforementioned variable reflectance mirror from a result of the aforementioned line of sight detection equipment.

Canon patent for curved sensor design (to suppress vignetting)

canon patent

Canon’s labs working on a curved sensor design? At least a new patent suggests it.

The patent refers to a curved sensor design with should suppress vignetting artefacts to a large degree.

  • Patent publication number 2016 – 197663
    • Release date 2016.11.24
    • Application date 2015.4.3
  • Canon patent
    • Make the central part flat in shape where light falloff is not noticeable
    • The surrounding portion where the drop in light quantity is conspicuous is defined as a curved shape

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Excerpt from the patent literature:

[Claim(s)] [Claim 1] It has an imaging surface which carries out light reception of the light from an object imaged with a lens,
An image sensor, wherein the aforementioned imaging surface has a flat shape part and a curved shape section.
[Claim 2] The image sensor according to claim 1 having made a central part of the aforementioned imaging surface into a flat shape part, and making a periphery of the aforementioned imaging surface into the aforementioned curved shape section.
[Claim 3] The image sensor according to claim 2, wherein a position of a boundary between said flat shape part and the aforementioned curved shape section is set as the same distance to one reference point on the aforementioned imaging surface.
[Claim 4] The image sensor according to claim 3, wherein the aforementioned imaging surface has a picture element region where a unit pixel is arranged at matrix form.
[Claim 5] The image sensor according to claim 4 which is provided with the following and characterized by the aforementioned valid pixel area comprising said flat shape part and an aforementioned curved shape section.
A valid pixel area which outputs a signal [ picture element region / aforementioned ] according to light income.
A black reference picture element region which outputs a black reference signal.

[Claim 6] The image sensor according to claim 5, wherein the aforementioned reference point is placed at the center of the aforementioned valid pixel area.
[Claim 7] The aforementioned black reference picture element region adjoins the aforementioned valid pixel area, and is arranged, and, in the aforementioned black reference picture element region, the part or whole serves as a curved shape section, The image sensor according to claim 5 or 6, wherein curvature of a curved shape section of the aforementioned black reference picture element region differs from curvature of a curved shape section of the aforementioned valid pixel area.
[Claim 8] The image sensor according to claim 7, wherein curvature of a curved shape section of the aforementioned black reference picture element region is smaller than curvature of a curved shape section of the aforementioned valid pixel area.
[Claim 9] An image sensor of a description in any 1 item of Claims 5-8, wherein the aforementioned black reference picture element region comprises a shaded unit pixel provided with a photoelectric conversion part.
[Claim 10] An image sensor of a description in any 1 item of Claims 5-8, wherein the aforementioned black reference picture element region comprises a unit pixel without a photoelectric conversion part.
[Claim 11] An image sensor of a description in any 1 item of Claims 1-10,
The aforementioned lens,
An imaging device characterized by preparation ******.
[Claim 12] The imaging device according to claim 11, wherein the aforementioned reference point is placed on an optic axis of the aforementioned lens.

[via Egami]

Canon Patent: 85mm f/1.2, 85mm f/1.8, 135mm f/2, 50mm f/1.4

Canon Patent

50mm f/1.4

Canon Patent

135mm f/2

Canon Patent

85mm f/1.8

Canon Patent

85mm f/1.2

Egami (translated) spotted new patents for lenses filed by Canon: 85mm f/1.2, 85mm f/1.8, 135mm f/2 and 50mm f/1.4.

  • Patent Publication No. 2013-114133
    • Publication date 2013.6.10
    • Filing date 2011.11.30
  • Example
    embodiment
    Focal length Fno. The overall length of the lens BF Lens constitution
    One 85.00 1.24 122.56 38.35 10 pieces of six groups
    Two 83.30 1.80 116.11 39.11 10 sheets in 7 groups
    Three 132.30 2.06 162.67 43.23 10 sheets in 7 groups
    Four 51.70 1.41 87.84 38.94 7 group nine

    Image height Y = 21.64mm

  • Factors that chromatic aberration of magnification chromatic aberration or axial chromatic aberration occurs
    • Reducing the total length
    • Focal length for a long time
  • Glass material Abbe number 70-90, of 1.4-1.5 refractive index
    • Possible correction of axial chromatic aberration
    • Must increase a curvature, spherical aberration and curvature of field is generated
  • Canon patent
    • I use a glass material having an anomalous partial dispersion of the predetermined
    • Consisting of organic and inorganic compound

Performance

[via Egami]

Canon Patent For Liquid Optical Elements (liquid lens)

liquid lens

Liquid optical element

liquid lens liquid lens

Figure above: When electricity is applied the optical element gets a shape.

Another Canon patent spotted by Egami (translated).

Liquid lenses have a series of advantages over traditional lenses. Beside not having moving parts (and thus less mechanical parts), they respond quicker to electrical signals, they do not have a motor (you thought that USM was the big thing? Think again) and they are naturally much more silent. The lack of a motor also means such a lens needs less electrical power, hence the battery lasts longer. Liquid lenses are most likely going to be employed in compact cameras and/or smartphones. If you want a more scientific description about what liquid lenses are and do, I recommend this article.

It is not the first time Canon files a patent for a liquid lens (and yes, I shamelessly recycled some of the text of my previous post 🙂 ).

Patent description (machine translated):

  • Patent Publication No. 2013-101227
    • Publication date 2013.5.23
    • Filing date 2011.11.9
  • Canon patent
    • I drive a plurality of pumps
    • Drive pump liquid optical element to hold the end of the interface
    • When applied to the electrodes, electrowetting phenomenon in which the liquid moves to the interface from the drive pump occurs
    • Optical properties are changed by the movement of the liquid
    • By discretely and independently controlled and a voltage, enabling high-speed drive
[via Egami]

Canon Patent: Two Superzooms For APS-C And Full-Frame Cameras (next kit lenses?)

Canon Patent

Egami (translated) spotted another Canon patent. Two superzoom lenses, one for APS-C cameras (18-200mm f/3.5-5.6), the other for full-frame (28-200mm f/3.5-5.6). Given all the patents I published in the last months, it appears that Canon is intensively working n new technology. Both lenses are image stabilized and both are most probably future kit lenses.

  • Patent Publication No. 2013-97184
    • Publication date 2013.5.20
    • Filing date 2011.11.1
  • Example 1
    • Zoom ratio 10.39
    • Focal length f = 18.60-60.40-193.27mm
    • Fno. 3.48-4.98-5.88
    • Half angle ω = 36.27-12.74-4.04 °
    • Image height 13.65mm
    • 144.58-176.50-208.42mm overall length of the lens
    • BF 38.09-63.96-77.06mm
    • 16 pieces of 13-group lens configuration
    • Four four-sided aspherical
    • The effective diameter of the front lens 55.82mm
    • MOD 0.5m
  • Example 3
    • Zoom ratio 6.69
    • Focal length f = 28.90-76.87-193.28mm
    • Fno. 3.60-5.27-5.88
    • Half angle ω = 36.82-15.72-6.39 °
    • Image height 21.64mm
    • 144.56-176.58-208.59mm overall length of the lens
    • BF 38.00-66.95-76.98mm
    • 15 pieces of 11-group lens configuration
    • Four four-sided aspherical
    • The effective diameter of the front lens 62.81mm
    • MOD 0.5m
  • Canon patent
    • 5-group zoom positive and negative negative positive positive
    • Inner Focus (third group)
      • Because it is possible to reduce the beam effective diameter of the first group, can be miniaturized optical system
    • Image stabilization

Canon Patent

[via Egami]