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US3374586A - Lens-grinding wheel - Google Patents

The only difference is that in the grinding of the convex lens 25 the undercut 26 will occur at the outside of the ring 13; whereas in the grinding of a concave lens, the undercut 24 will be on the inside surface of the ring. It will readily be apparent from FIGS. 1 and 2 that .

Lens polishing machine - HODGES; LEE R. - Free Patents Online

Apr 25, 1978 · 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.

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title: lens-grinding machine

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The First Telescopes (Cosmology: Tools) - Niels Bohr Library

The manufacture and properties of lenses were known since the time of the Greeks. Islamic scholars such as the Egyptian physician Alhazen (born in the 10 th century) made important contributions to the study of optics. However, lenses were not introduced to Europe until around the 13 th century. By 1300, the first eyeglasses were available in cities such as Venice and Florence, and advances in ...

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Lap Grinding And Polishing Machine - The Lens

An apparatus, system and method for grinding or polishing an optic is provided. The apparatus includes a shell adapted to a bending profile, torque actuators attached at an outer edge of the shell and coupled to each other, a tensioning system attached at the outer edge of the shell, and a control system for computing the bending profile and controlling the torque actuators and tensioning system.

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The district court found, 41 F.Supp. 258, that the claims of each of these eight patents are for a finished lens and that consequently the wholesalers and finishing retailers, in grinding and polishing each lens, practice in part the patent, in conformity to which the Lens Company has manufactured the blanks which it .

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Lutz Gottschald Inventions, Patents and Patent ...

The spectacle lens securing shaft is pivotable about an axis of the guide column that is spaced from the rotational axes of the grinding wheel and of the spectacle lense securing shaft and perpendicular thereto. A grinding chamber encloses grinding wheel and spectacle lens securing shaft.

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Aspheric lenses - SlideShare

May 09, 2014 · conclusion • aspheric lenses are a hoghly useful group of lenses which provide visual & cosmetic benefits for patient. • aspheric lenses can be ordered in high index material for the ultimate in attractive thin lens. 9 may 2014 77 78. 9 may 2014 78

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The Galileo Project | Science | Telescope

The telescope was unveiled in the Netherlands. In October 1608, the States General (the national government) in The Hague discussed the patent applications first of Hans Lipperhey of Middelburg, and then of Jacob Metius of Alkmaar, on a device for "seeing faraway things as though nearby." It consisted of a convex and concave lens in a tube, and the combination magnified three or four times.

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FDP - Fujimi Diamond Pellet and Resin - Fujimi Corporation

FDP - Fujimi Diamond Pellet and Resin. FDP is a diamond tool for rough polishing of optical lenses, prisms, and other precision glass products.FDP consists of carefully selected diamond abrasives formed into a pellet by a unique process developed by Fujimi.FDP produces rapid stock removal, increased efficiency in production, and elimination of waste. ...

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Lens grinding machine - Free Patents Online

Jul 15, 1975 · Referring now to FIG. 6, another alternative embodiment 50b of the lens grinding machine of the present invention is shown with all conventional portions of the lens grinding machine 50b being omitted for purposes of clarity as was the case in FIGS. 3 and 4 .

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Chapter 8 The Telescope -

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.

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Progressive lens - Wikipedia

Progressive lenses, also called focal lenses, progressive addition lenses (PAL), varifocal lenses, progressive power lenses, graduated prescription lenses, or progressive spectacle lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation.They are characterised by a gradient of increasing lens power, added to the wearer's correction for the ...

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US 5145684 A - Surface Modified Drug Nanoparticles - lens

The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus. English ... The method of claim 16 wherein said grinding media have an average particle size of less than 1 mm.

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The Lens - Free & Open Patent and Scholarly Search

The Lens serves almost all the patents and scholarly work in the world as a free, open and secure digital public good, with user privacy a paramount focus.

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Amazon: Online Shopping for Electronics, Apparel ...

Online shopping from the earth's biggest selection of books, magazines, music, DVDs, videos, electronics, computers, software, apparel & accessories, shoes, jewelry ...

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How eyeglass lens is made - material, production process ...

The machine grinds each lens to its proper shape and places a bevel around the edge of the lens so that the lens will fit the eyeglass frames. Water flows over the lens throughout this process. 10 If the lenses require additional grinding, the process is done by hand using a mounted power grinder.

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The Telescope: 400 Years on - antiquespectacles

Patent Application Empty long tubes were used in Antiquity to screen out disturbing side light, therefore creating the equivalent of a lens-less telescope. Unfortunately, this did not increase visual efficiency when people were trying to observe the stars because there was no magnification. Glass-making and lens-grinding had been

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Patent of the Day: Bifocal Lens - Patent Attorneys | Nebraska

Jun 30, 2017 · Where lenses are made, however, as disclosed in Letters Patent of the United States No. 1,063,421, issued to me on the 3 rd of June, 1913, it is comparatively easy to give this wider area to the reading or close vision member, and it is also possible to accomplish this result, though not in so perfect a manner, by what is called solid grinding ...

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PATENTS – Inland Diamond

INLAND DIAMOND PATENTS. Patent Title: Patent No. Beveling wheel, method for forming a beveled lens for use with eyeglasses and a beveled lens: 9,405,130: Segmented profiled wheel and method for making same: ... Pull tab for velcro backed marble grinding pad and method for removal: 5,170,595:

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