Projection lens incorporating a pair of matching plastic lenses

Details Projection lens incorporating a pair of matching plastic lenses Projection lens incorporating a pair of matching plastic lenses

1993-05-20

1994-12-06

Sugarman, Scott J.

Optical: systems and elements

Lens

With field curvature shaping

359713, 359714, G02B 1318

Patent

active

053716280

ABSTRACT:
This projection lens for a projection television includes coaxially in order towards the face plate of the CRT: a first lens of negative power, both of whose surfaces are aspherical; a second lens of positive power, at least one of whose surfaces is aspherical, formed of a plastic material; a third lens of positive power; a fourth lens of positive power, at least one of whose surfaces is aspherical, formed of a plastic material; and a back lens of negative power, which presents in the direction away from the face plate of the CRT a face of strongly concave curvature. The third lens is the strongest of the lenses in absolute power, and the second lens and the fourth lens have substantially the same optical characteristics, and are disposed in reverse orientation on opposite sides of the third lens. Certain conditions relating to lens parameters should be satisfied for acceptable optical performance. It is anticipated that the second lens and the fourth lens will be manufactured from plastic material by using the same metal mold for injection molding, which provides highly desirable cost economy for manufacturing setup.

REFERENCES:
patent: 4682862 (1987-07-01), Moskovich
patent: 4924244 (1990-05-01), Kataoka et al.
patent: 4933599 (1990-06-01), Fukuda

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