Asahi Lite Optical Co., Ltd.

Other

Tadashi Kobayashi

Yuyoshi Saito

Kazunori Kagei

Shoji Kato

Zhou Yang

Yin-Nian Lin

Zhenya Zhu

Kazuhiko Tsujibata

A base lens of a polyurethane resin comprising a polyisocyanate compound and a polythiol, a sulfur-containing polyol or the like is coated with a primer layer having a thickness sufficient for shock absorption, an organosiloxane-type, hard coat layer having a refractive index of 1.47 or more, and optionally a thin metal layer in that order. As having this constitution, the plastic lens has a mechanical strength resistant to striking energy of not smaller than 4 times the striking energy value of the FDA Standard, 0.204 joules, when the center thickness of the lens is from 0.7 mm to less than 1.2 mm. Since the latitude in the acceptable range for the conditions for the processing of the lens (relative to the thickness of each constitutive layer) is large, the producibility of the lens is high. An inhomogeneous layer may be formed between the adjacent layers, which reduces the reflectivity of the lens for transmitting light and prevents the formation of interference fringes in the lens. An ultraviolet absorbent, if added to the hard coat layer, can cut off ultraviolet rays, while preventing the base lens and the coat layers from being aged, and is helpful in protecting eyeballs.

Plastic lenses for spectacles with high refractive indices

The present invention provides, by adding an ultraviolet absorbent and a colorant having a specific chemical structure, a plastic base material capable of effectively suppressing the transmission of ultraviolet radiation and short wavelength visible radiation known harmful to eyes, which material further reduces glares.

Plastic base material

A method of continuously fabricating a lens excellent in various optical characteristics and having no nonuniformity in the characteristics over a total of the lens and a lens fabricated by the method. A first step for forming thiourethane prepolymer and a second step for making thiourethane prepolymer react with at least one urethane forming monomer are carried out in an extruder or in a reactor having an extruding device at a succeeding step, extruded thermoplastic thiourethane-urethane copolymer for optical use is elongated in a sheet-like shape, a lens precursor is formed by punching out the copolymer elongated in a sheet-like shape and the lens precursor is pressed such that a predetermined curved face is provided at least on one face of the lens precursor.

Process method optical thermoplastic urethane resin lens and the lens

As a method by which failed products of hard-coated plastic lenses, especially hard-coated high-refractive-index plastic lenses can be regenerated to be in a re-usable condition, plastic lenses coated with a hard coat consisting essentially of an organopolysiloxane compound and an inorganic oxide, are contacted with an aqueous solution of a silicate and/or a phosphate. For example, an aqueous solution of 30% trisodium phosphate heated at 50&deg; C. is sprayed over hard-coated plastic lenses for 5 minutes. The hard coat is removed from the lenses, while the surface of the coat-removed lenses is not roughed. The coat-removed lenses are re-usable.

Method for removing hard coat film from plastic lens

Method of manufacturing plastic lenses

An apparatus for simultaneous defiberization of waste paper stock and uniform dispersion and accumulation of the defiberized fine fiber stock for dry web formation comprising a defiberizing drum having cylindrical teeth formed of its inside circumferential plane and an outlet part for the delivery of said defiberized fine stock formed of its lower part, a hollow rotary shaft provided rotatably in said defiberizing drum, a multitude of swing hammers provided swingably around said hollow rotary shaft both circumferentially and axially at respectively regular intervals, said swing hammers having edges formed of their top and facing said cylindrical teeth with a suitable clearance maintained between said edges and cylindrical teeth, air vents provided to the hollow rotary shaft for passing outer air from said shaft to the inside of said drum and a suction wire part for receiving and supporting the thin paper sheet to accumulate the fine stock thereon, said suction wire part being provided under said outlet part having holes opening above the thin paper sheet.

Apparatus for simultaneous defiberization of waste paper stock and

A golf ball washing machine, comprising a circular golf ball wash chamber at the center of which are rotatably provided a lower brush disc and a central brush cylinder coaxially therewith, the inner peripheral surface of said wash chamber being detachably provided with a flexible belt-like brush plate.

Golf ball washing machine

A paper making apparatus for producing sheets of paper at speeds in excess of 200 m/minute. A breast roll and a wire cage turning cylinder are disposed above and below a forming roll. The forming roll is a hollow roll having a smooth surface. A belt passes in an S-shape over the forming roll and turning cylinder and a wire belt passes over the breast roll, forming roll and turning cylinder. The head box discharges raw material between the wire belt and the S-shaped belt, and a web is formed along the circumference of the forming roll over an angle of about 100.degree.. A web pick-up device is provided under the turning cylinder to separate the formed web from the wire belt.

Growing community of inventors

Fukui, Japan

Tadashi Kobayashi