History | About Us | KYORITSU SEIKI CORPORATION
History. 1950. Established in the present address. Started to manufacture components for aircrafts, vessels, automobiles as well as jigs, tools. 1958. Started to develop and market machine tools (holders) as own brand. 1967. Started to develop and market pre-setter. and NCG type lens grinding machine.
New telephoto lens design patent - Page 23 - PentaxForums.com
The Olympus 150-400/4.5 is heavy by m4/3 standards (1.8kg) and expensive @ $7500. There's been a waiting list of over a year for it. 300/2.8 feels a bit short, particularly on full frame, unless Pentax also released FF-compatible teleconverters along with it. 400/4 would be nice, and of similar size & weight to the current D FA 150-450.
Chapter 8 The Telescope - William & Mary
spectacle maker, seeking a patent for a telescope. The patent was denied because of easy telescope duplication and difficulty in patent enforcement. The instrument spread rapidly. Galileo heard of it in the early 1600s and quickly made improvements in lens grinding that increased the magnification from a relatively low value of 2 to as much as 30.
US4085549A - Lens polishing machine - Google Patents
- Google Patents A high speed lens grinding and polishing machine comprising a lap tool holder and a gimbal mounted polishing element disposed at its lower extreme in a spherical bearing permitting...
Apple patent filing involves 'optical systems with lens ...
Apple has filed for a patent (number 20210405379) for "optical systems with lens-based static foveation." It involves the rumored "Apple Glasses," an augmented reality/virtual reality head-mounted display (HMD). About the patent filing In the patent filing, Apple notes that electronic devices may include displays that present images close to a user's eyes.
US3583111A - Lens grinding apparatus - Google Patents
A lens grinding disc of thin sheet material having spring quality, such as brass shim material, is provided with slits extending inwardly from its periphery to enable it to conform to a lens surface when applying a fine abrasive material thereto in a grinding or polishing operation. Other slits may extend radially outwardly also. The disc may be of metal, or synthetic resin, or of woven …
Method of edge finishing an optical lens of polycarbonate ...
The slots carry away from the workpiece abraded particles which would otherwise be retained on the grinding surfaces. EP-A-0 445 568 discloses a process for manufacturing a grinding wheel for grinding spectacle lens edges. The grinding wheel has a main body and an abrasive layer of diamond and metal.
Assignees list Aj-Al - Patent application
Assignees list Aj-Al - Patent application. Assignee's name. Last publication. Number of Patent applications. AJ Acquisition I LLC. 2012-02-09 / 20120031386 - COMPRESSED GAS-POWERED PROJECTILE ACCELERATOR.
Lens spherical surface grinding method using dish-shaped ...
HK-1174871-A1 chemical patent summary.
Eyeglass lens grinding machine - Patent KR-101456301-B1 ...
KR-101456301-B1 chemical patent summary.
Lens polishing machine - HODGES; LEE R.
A high speed lens grinding and polishing machine comprising a lap tool holder and a gimbal mounted polishing element disposed at its lower extreme in a spherical bearing permitting a lens blank holder to follow the contour of the lens during the polishing process.
Lens grinding machine - DIMELP OPTICAL CO. INC.
Lens grinding machine. United States Patent 3894361. Abstract: A machine for selectively grinding the peripheral edges of both glass lens materials and plastic lens materials to a predetermined size and shape includes an axially shiftable shaft having a rough grinding wheel for rough grinding a glass lens to a rough size and shape corresponding ...
Canon Patent: Zoom Lens That Shrinks When Zooming To …
Canon Patent: Zoom Lens That Shrinks When Zooming To Telephoto. A new Canon patent application. A lens that becomes shorter when you zoom to the telephoto end. Usually it is the opposite. asobinet.com spotted this Canon patent application. The lens seems to have f2.8/f4 and covers the standard focal length.
New telephoto lens design patent - Page 13 - PentaxForums.com
Japanese patent No. 6586636, registered on 20 September 2019 and published on 9 October 2019, corresponding to the Japanese patent application No. 2015-250129 filed on 22 December 2015 and published on 4 August 2016 under the reference P2016-139125A. Inventor is Takuya Imaoka.
Thoriated Camera Lens (ca. 1970s) | Museum of Radiation ...
A couple of patents for optical glass containing thorium were issued in 1939 that were of a somewhat general nature. Later, in 1949, a patent with a couple of specific formulations for such glass was issued to Paul De Paolis at Kodak. ... The shaping, grinding or polishing of such lens or manufacturing processes other than the assembly of such ...
Canon Patent: 14-280mm f/2.8-5.6 Lens For 4/3 Sensor
Canon patent application 2021-183997 (Japan) discusses optical formulas for a 14-280mm f/2.8-5.6 lens for a camera with a 4/3 sensor. From the patent literature: There are known zoom lenses that are compact and can efficiently obtain a magnification ratio, which are suitable for image pickup devices such as digital cameras, video cameras, and ...
Ricoh filed a patent for a 18-100mm f/2.8 APS-C lens ...
Ricoh has filed a patent for a 18-100mm f/2.8 APS-C lens (28-150mm equivalent) – here are the details: Focal length: 18.5-101.9 F value: 2.9 Half angle of view: 39.0-7.7 Image height: 14.24 Via Asobinet Related posts: New Ricoh GR IIIx camera announced Pentax K-3 Mark III DSLR camera officially announced Ricoh announces three HD PENTAX-FA […]
US4383393A - Automatic lens grinding machine - Google …
US4383393A - Automatic lens grinding machine - Google Patents An automatic grinding machine adapted to form a desired profile of the peripheral ridge of a …
Emil Busch | Camerapedia | Fandom
The Emil Busch A.-G. was a camera and lens maker based in Rathenow, Germany. In 1792 the pastor Johann Heinrich August Duncker (1767-1843) of Rathenow began to make optical instruments and sold them in Germany. In 1801 he got the permission from the Prussian King to extend his business to industrial dimensions. He employed orphaned children and war invalids …
New telephoto lens design patent - Page 24 - PentaxForums.com
The use of SR in-lens for long lenses will probably improve the PD-AF performance - and make the OVF easier to use. Olympus (OM-Digital..) make use of in-lens SR combined with IBIS in their 300/4 and the 12-100/4 to get impressive stabilisation. I find that the DA*300 with 1.4x TC can be hard to hold steady - so in-lens SR would be welcome.
Anyone here grind lenses | Laser Pointers
Well we all know these big diodes have astigmatism. Can anyone grind a singl lens to correct for it? More cylidrical for the fast axis and less on the slow? I never seen anyone attempt this. Im sure each different diode will require a …
Lens grinding apparatus and method - Google Patents
B24B13/043—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of …
Lens grinding machine - Patent US-1952212-A - PubChem
US-1952212-A chemical patent summary.
Grinding method of lens spherical surface using dish ...
JP-5453459-B2 chemical patent summary.
Interesting: Nikon filed a patent for a full frame ...
Nikon filed a patent in Japan for a new 28-80mm f/3.5-5.6 VR full frame mirrorless lens. I do not remember seeing something similar in the past. Could there be a new FX system on the horizon for 2015? Nikon already had an AF 28-80mm f/3.5-5.6D lens designed for DSLR cameras that has been discontinued for a while.. Two other recent Nikon patents – continuous …
US2826874A - Automatic lens grinding ... - …
51-460 My invention relates to an automatic lens grinding and polishing machine.
B24B 9 - Machines or devices designed for grinding edges ...
Patents for B24B 9 - Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor (9,298) ... US6832946 …
Fabrication - LightPath Technologies
Molding. Grinding & Polishing. Diamond Turning. Lens Dicing and Edging. Pilot Production. LightPath offers several techniques to manufacture optics for your project's specific needs. LightPath's specializes in precision glass molding of visible and infrared optics for economical manufacturing of high performance lenses in production volumes.
About a Dallmeyer '3D' patent Portrait lens. | Photo.net ...
The patent application and optical design can be found here. Part of the patent applies to the ability to alter the separation between the rear elements, introducing (more) spherical aberration and thus softening the overall image. It was that mechanism - a simple screw thread - that was seized on my lens.
Lens - Wikipedia
A lens is a transmissive optical device which focuses or disperses a light beam by means of refraction.A simple lens consists of a single piece of transparent material, while a compound lens consists of several simple lenses (elements), usually arranged along a common axis.Lenses are made from materials such as glass or plastic, and are ground and polished or molded to a …