Step-index light guide and gradient index microlens device for L

Details Step-index light guide and gradient index microlens device for L Step-index light guide and gradient index microlens device for L

1989-07-10

1990-08-14

Bovernick, Rodney B.

350 9631, G02B 600

Patent

active

049482149

ABSTRACT:
Each individual light emitter of a LED linear array is imaged by a discrete step-index light guide and gradient index microlens device. The light guides consist of high refractive index cores, each surrounded by low refractive index matter. A multiplicity of light guides are deposited in channels formed in a host material, such as a silicon wafer. The host material between adjacent channels functions as an opaque separator to prevent cross-talk between adjacent light guides. Optically bonded to the LED array, the light guides conduct a large portion of the diffuse light emitted to a series of microlenses optically bonded to and in registration with the exit end of each light guide. The microlenses are constructed in a transparent substrate, with each microlens having a spherical or aspherical gradient index profile and short focal length.

REFERENCES:
patent: 4557581 (1985-10-01), Woolley et al.
NSG America Inc Selfoc Lens Array catalog (Nippon Sheet Glass Co., Ltd.).

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