1989-05-04
1990-01-09
Lee, John D.
350432, G02B 632
Patent
active
048923753
ABSTRACT:
A fibre-type light conversion device comprises a fibre-type conversion element for changing the wavelength of an incident light and a converging lens for converging said incident light whose wavelength is changed by the conversion element. The device is characterized in that the converging lens is a single lens having an aspherical surface configured such that a distance Zi from a plane perpendicular to an optical axis of the lens and passing an extremity of the lens to a point on the aspherical surface having a height Y from the optical axis is expressed by the following equation ##EQU1## where Ci is an inverse number of the radius of curvature of the "i"th surface at an intersecting point between the "i"th surface and the optical axis, Ki, A.sub.1 (i).about.A.sub.10 (i) are constants, and Y is the height from the optical axis to the refracting surface.
REFERENCES:
patent: 4820029 (1989-04-01), Iwai et al.
Chikuma Kiyofumi
Okamoto Sota
Heartney Phan T.
Lee John D.
Pioneer Electronic Corporation
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