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GRIN Dictionary Terms

free-abrasive machining
The process whereby a rotating wheel carries grains of an abrasive, suspended in a vehicle, across the surface of the...
finished lens molding
A method used to produce precision spherical and aspheric molded glass lenses without grinding or polishing.
mirror blank
A mirror blank refers to the initial piece of material from which a mirror is made. It is typically a flat or slightly...
lens blank
A lens blank is a piece of optical material in a raw, unfinished state, typically in the form of a disk or block, from which...
optical manufacturing tools and machinery
Optical manufacturing tools and machinery encompass a wide range of equipment, instruments, and systems used in the...
diamond turning
Diamond turning, also known as diamond machining or diamond cutting, is a precision machining process used to produce...
computer numerically controlled grinding
Computer numerically controlled (CNC) grinding is a manufacturing process that utilizes computerized controls and precision...
fining
A grinding process that employs fine emery.
emery
A natural abrasive, produced from corundum in grades ranging from rough to fine, used in the grinding and lapping of glass.
scratch
A defect on a polished optical surface whose length is many times its width. Block reek is a chainlike scratch formed in...
polishing and abrasive material
Any of the numerous powders used for grinding and polishing glass, crystal or metal, the chief material being emery and...
metal component
An accurate metal prism or plane parallel plate that is cemented to an optical element and remains with it during a series...
grinding
The process in the manufacture of an optical system that gives it the required geometric shape.
block
A supporting member used to hold optical parts during grinding and polishing. It also describes the assemblage of optical...
gray
1. A measure of absorbed dose, equal to the energy imparted by ionizing radiation to a mass of matter corresponding to 1 J...
decentering
1. The grinding or edging of a lens so that the geometrical center and optical center do not coincide. 2. The shifting of an...
surface
1. In optics, one of the exterior faces of an optical element. 2. The process of grinding or generating the face of an...
spotted tool
A metal tool used to hold a number of lens blanks during grinding and polishing.
clearing
Also called shining. Grinding and polishing one surface of a blank to permit a more thorough examination for quality.
molded lens
A molded lens is an optical lens manufactured using a molding process, typically involving the shaping of a material, such...
swing
The length of the oscillation of a grinding or polishing lap.
slurry
The name of the mixture of liquid and grinding or polishing compounds used in processing optical materials.
second-side meniscus
The process of grinding the convex surface of a convexo-concave meniscus.
roughing
A term used to describe a very coarse grinding process.
blocking
The process whereby blanks are attached to a block in a position for grinding or polishing.
gradient-index profile
The term gradient-index profile refers to a specific type of refractive index distribution within an optical material. In...
first-side meniscus
The process of grinding the concave surface of a single-vision spherical lens.
sand hole
A crude area on the polished surface, produced during coarse grinding, that subsequent fine grinding does not remove, owing,...
optical blank
A casting consisting of an optical material molded into the desired geometry for grinding, polishing or, in the case of...
protective bevel
The removal of a sharp edge on an optical element by grinding, to prevent accidental chipping of that edge during subsequent...
chamfer
The removal of sharp edges by grinding.
edging
The finishing of the edge of an optical element by grinding.
petrographic specimen preparation
The grinding and polishing of rock samples, to a thickness of less than 0.05 mm, for study with petrographic microscopes....
Twyman-Green interferometer
A testing device that provides a contour map of the emergent wavefront for the observer in terms of the given wavelength of...
cleared out
Denoting a finished circular edge. A decentered lens is adjusted on a centering chuck so that its image runs true, and the...
second-side toric
The process of grinding the concave surface of a sphero-cylindrical lens.
polishing
The optical process, following grinding, that puts a highly finished, smooth and apparently amorphous surface on a lens or a...
GRIN lens
A GRIN (gradient index) lens is a type of optical lens that utilizes a gradient in refractive index across its volume rather...
cup bevel
A bevel produced by grinding with a cup-shaped tool.
grinding tool
A tool of cast iron or another suitable medium used with a slurry of silicon carbide, aluminum oxide or emery for grinding...
lens molding
The production of rough glass lens blanks that are pressed while red-hot to the approximate size and shape of the finished...
lap
A metal tool used to grind lenses with loose abrasive (see diamond cutting tool). The functional surface of the lap is...
generating mark
The curved mark formed when, in the process of generating, a loose or coarse diamond particle from the generating tool...
blocking material
Pitch, wax, resin or other cement suitable for holding optical parts to a spindle during grinding and polishing processes.
first-side toric
The process of grinding the toric surface of a single vision sphero-cylindrical lens.
ground glass
A plate of glass in which a face has been frosted by grinding or etching. It diffuses light by scattering in directions...
diamond-turned optic
Diamond turning refers to a precision machining process used to produce complex optical components, particularly lenses and...
crystal
A solid with a structure that exhibits a basically symmetrical and geometrical arrangement. A crystal may already possess...
open bubble
A bubble at a polished surface that has been opened by grinding or polishing.
grinding and polishing machinery
Machinery used to grind and finish a component, such as a lens or prism, to a desired precision. Usually such machines carry...

(50 results found)

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