Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Composite or multiple layer
Patent
1985-02-25
1986-10-07
Lowe, James
Plastic and nonmetallic article shaping or treating: processes
Optical article shaping or treating
Composite or multiple layer
249 91, 264 14, 264 21, 264 27, 425125, 425127, 425171, 425172, B29D 1100
Patent
active
046158472
ABSTRACT:
A lens is produced having one aspherical surface which is accurately axially aligned with a spherical or flat surface on the opposite side of the lens. The aspherical surface is produced with a mold. The mold has a molding surface having an accurate negative profile and the desired finish of the required aspherical surface.
The mold is on a rotatable jig. By means of adjustment screws the mold is adjusted to correct misalignment of the axis of the molding surface and the axis of rotation of the jig. Misalignment is detected by directing a collimated light beam onto the molding surface so that it is reflected onto a screen. When the mold is rotated, the light beam moves on the screen until the molding surface is properly aligned with the axis of rotation.
A preformed glass substrate has one aspherical surface of approximately the desired profile and finish and on its opposite side a spherical or flat surface. The substrate is then mounted on the jig with its aspherical surface facing and spaced from the molding surface. By means of further adjustment screws, the substrate is adjusted to correct misalignment of the axis of the spherical or flat surface of the substrate and the rotational axis of the jig. This misalignment also is detected with the collimated light beam and the screen.
The gap between the substrate and the mold is then filled with a suitable liquid light transmissive polymeric material. The polymer is allowed to harden and form a molded layer bonded on one side to the substrate. The other side forms an aspherical surface of the required profile and optical finish, axially aligned with the spherical or flat surface of the substrate.
REFERENCES:
patent: 2266169 (1941-12-01), Crimnine
patent: 2332674 (1943-10-01), Smith
patent: 2532501 (1950-12-01), Johnson
patent: 3174391 (1965-03-01), Papke
patent: 3237204 (1966-03-01), Honsaker
patent: 3273204 (1966-09-01), Craddock
patent: 4246207 (1981-01-01), Spycher
patent: 4440699 (1984-04-01), Smid et al.
Lowe James
Schechter Marc D.
U.S. Philips Corporation
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