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Dual Layer Foveon Sensor Patent by Sigma

Sigma Patent a Dual layer Foveon for the first time, in general Foveon sensors are made up of three layers. According to patent documents the new sensor will improve the readout speed of the sensor.

Sigma Foveon sensor Details Patent Details

  • [Publication number] Japanese Unexamined Patent Application Publication No. 2018-195961 (P2018-195961A) click here
  • [Publication date] December 6, Heisei 20 (2018.12.6)
  • Image processing signal method, image signal processing apparatus, imaging apparatus

Each pixel has two layers of “B and G” or “G and R” as shown in a figure of embodiment.

We will sure see some improvements in low -light performance and readout speed of Sigma sensor, as we all know Foveon sensor are too good at base ISO but when you reach ISO 400 you can notice noise in your image and even ISO 1600 is bit unacceptable from a Foveon sensor. To solve this issue Sigma removed a layer from sensor and rearranged entire pixel structure. Hope to see some good cameras from Sigma in near future.

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Tamron 100-400 M4/3 and Sigma 12mm F2.8 DSLR Lens Patent

Take a look at the latest Lens patent coming out from Leading third party lens makers Tamron and Sigma.
Sigma Filed a patent of 12mm F2.8 Lens for Full-frame sensor camera. After looking at the patent details we can confirm you, that its a DSLR lens.

Specification and lens arrangement of embodiment 8
Focal length: 12.42 mm
F number: 2.93
Angle of view: 120.49
Image height: 21.63 mm
Lens length: 169.4 mm


Patent Details

[Publication number] Japanese Unexamined Patent Application Publication No. 2018-185489 (P2018-185489A) click here
[Publication date] November 22, 1993 (2018.11.22)
Patent application title: ZOOM LENS AND IMAGING DEVICE

Now let’s talk about latest Tamron patent, Tamorin is working on 100-400mm F2.6-F8.3 for M4/3 sensor. After looking at the aperture range I am bit surprised, having a 8.3 aperture at 400mm end isn’t so normal and you need to have vast amount of light to get clear shots with your lens. But before we begin, I must tell you that I am not impressed with the aperture range of upcoming Tamron 100-400mm lens for M4/3 camera.

See more Tamron Patent | Sigma Patent

Sigma Patent - Nano Crystal Coating like Canon and Nikon

Sigma Working on advance lens Anti Reflection coating for lenses. For the lens coating, Sigma will going to use mesoporous silica material similar to “Nano Crystal Coat” of NIKON and “Air Sphere Coating” of CANON.

 

6 layer multilayer coating diagram shared by Sigam patent details

Patent Details of Sigma Anti Reflection Coating

PROBLEM TO BE SOLVED: To provide an antireflection film having low reflectance in a wide wavelength range of visible light to a substrate having various productivity and various refractive indices.

SOLUTION: This antireflection film is formed by laminating in order a first layer, a second layer, a third layer, a fourth layer, a fifth layer and a sixth layer from the side of the substrate in this order, A high refractive index material having an optical film thickness of one layer of 0.045λ or more and 0.971λ or less, the second layer has a low refractive index material with an optical thickness of 0.025λ or more and 0.166λ or less, The third layer has a high refractive index material with an optical thickness of 0.038λ or more and 0.375λ or less and the fourth layer has a low refractive index material with an optical thickness of 0.048λ or more and 0.152λ or less , The optical film thickness of the fifth layer is 0.045λ or more and 0.119λ or less, the optical film thickness of the sixth layer is 0.228λ or more and 0.331λ or less, and the refractive index is And is an ultra-low refractive index material having a refractive index of 1.10 or more and 1.30 or less.

source

Sigma Patent - 18-50mm F2.8 Lens With Optical Image Stabilization

Sigma 18-50mm F2.8 Lens image

On Sep 26, 2006 Sigma announced the 18-50mm F2.8 (Amazon | B&H) lens for APS-C DSLRs.  After that they announce 17-50mm F2.8 lens (B&H | Amazon) on Feb 10, 2010 as a successor of 18-50mm F2.8 lens with IS and improved optics.

Now, a new patent surfaced over the web that shows new version of Sigma 18-50mm F2.8 Lens with IS.

Take a look at the patent details below

SIGMA filed patent of 18-50 mm F2.8 for APS-C sensor with very short back focus.
This patent may be for one of new dp/DPs.

【公開番号】特開2017-211496(P2017-211496A) click here
【公開日】平成29年11月30日(2017.11.30)
【発明の名称】大口径防振付きズームレンズ

Specification and lens arrangement of embodiment 1
Focal length: 17.55 – 48.47 mm
F No.: 2.92
2ω: 81.42 – 32.32
Image height: 13.49 – 14.20 mm
Back focus: 1.0000 – 22.4957 mm
Lens length: 126.29 – 166.99 mm

If a true successor of  18-50mm F2.8 is coming After 10 years of Gap we do expect a lot of improvement in optics, AF speed, IS and overall performance of the upcoming Sigma APS-C lens.

We will update you soon as we get any new information. Also see Sigma new Foveon image sensor patent.

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Sigma Patent - 14mm F1.2 and 35mm F1.2

Latest patent surfaced over the, that shows sigma is working on 14mm F1.2 and 35mm F1.2 Lens.

Patent Details
Specification and lens arrangement of embodiment 6
Focal length: 13.92 mm
F No.: 1.28
2ω: 81.14
Image height: 10.82 mm
Lens length; 105.02 mm

 

 

Specification and lens arrangement of embodiment 7
Focal length: 34.98 mm
F No.: 1.28
2ω: 33.12
Image height: 10.82 mm
Lens length; 110.14 mm

We have already published that Sigma is working on 12mm F1.4 MFT Lens and 8mm F1.8 lens for MFT

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SIGMA Patent 12mm F1.4 MFT Lens

Sigma filed a patent of 12mm F1.4 for m4/3 lens.It’s a good news for M4/3 owners that Sigma is finally taking interest in M4/3 systems cameras. In Future we do expect ART series lenses dedicated for M4/3 system cameras.

Sigma MFT lens patent

Also take a look at the translated text from Sigma

FT san suggests that the embodiment 1 is same to “LEICA DG SUMMILUX 12mm / F1.4 ASPH” of Panasonic. That’s optical formula of both the lenses look exactly same.

Stay with us for LIVE camera rumors | See more Sigma Patents

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Sigma 12mm M4/3 Lens Patent

Sigma patent 12mm F1.4 M4/3 lens patent surfaced over the web. From its focal length and aperture its look like they are planning to announce a new ART series for M4/3 mount. Take a look at the patent details below.

Patent details (Translated)
Subject distance: INF 40 times 200 mm
Focal length: 12.35 12.35 12.32
F number (F number): 1.47 1.48 1.50
full angle of view 2ω (Angle of view): 88.12 88.02 87.77
image height Y (image height): 10.82 10.82 10.82
total lens length (lens length): 86.00 86.00 86.00 eXAMPLE 1 embodiment 1] [ Aberrations at INF] [ Aberration chart at close range Aberrations at 200 mm]

We have also published Sigma Patent – 8mm F1.8 Fisheye For MFT System.

However, earlier Sigma have denied the rumors that Sigma is entering in M4/3 lens mount. But, its look like they have changed their mind.