Single collimator lens

Details Single collimator lens Single collimator lens

1988-11-21

1989-09-05

Arnold, Bruce Y.

G02B 1318

Patent

active

048632481

ABSTRACT:
A collimator lens of a single lens type having a convex aspherical surface on the collimated light side and a plane surface on the condensed light side fulfills the following conditions: ##EQU1## wherein f represents a focal length of the collimator lens; t represents an axial distance of the collimator lens; NA represents a numerical aperture of the collimator lens; n represents a refractive index of the collimator lens; r represents a radius of curvature of the convex aspherical surface in the paraxial region. According to the collimator lens of a single lens type thus configurated, short axial distance and light weight can be realized, which makes it possible to be formed by the liquid glass drop method. In addition, the collimator lens of a single lens type which keeps good balance of an axial aberration and an off-axial aberration is obtainable.

REFERENCES:
patent: 4027952 (1977-06-01), Hugues
patent: 4449792 (1984-05-01), Arai et al.
patent: 4571034 (1986-02-01), Nakamura
patent: 4613212 (1986-09-01), Norikazu
patent: 4641929 (1987-02-01), Braat
patent: 4647352 (1987-04-01), Suda et al.
patent: 4671623 (1987-06-01), Chikuma
patent: 4743093 (1988-05-01), Oinen
patent: 4765723 (1988-08-01), Takamura
patent: 4768867 (1988-09-01), Suda

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