Illuminating optical device

Details Illuminating optical device Illuminating optical device

Filed on

1989-04-19

Date issued

1990-04-17

Examiner

Lazarus, Ira S.

Patent Class

Illumination

SubClass

Light source and modifier

SubSubClass

Plural serial lens elements or components

Other Related Categories

362 32, 350167, F21V 704

Type

Patent

Status

active

Patent number

049185837

Description

ABSTRACT:
An illuminating optical device having an optical integrator capable of receiving a light flux from a light source and substantially forming a plane light source comprising a plurality of light source images and uniformly illuminating an object includes a square-pillar-like internal reflection type integrator having a plurality of reflecting surfaces capable of reflecting the light flux from the light source and forming a plurality of virtual images of the light source on a plane near the entrance surface thereof, a fly-eye type integrator comprising a plurality of lens elements receiving the light flux from the light source and capable of forming a plurality of light source images on a plane, the lens elements being juxtaposed in proximity to one another, and relay lens means provided between the two integrators so that the exit surface of one of the two integrators which is adjacent to the light source and the entrance surface of the other integrator which is adjacent to the object are substantially conjugate with each other.

REFERENCES:
patent: 4476519 (1984-10-01), Hayamizu
patent: 4619508 (1986-10-01), Shibuya et al.
patent: 4656562 (1987-04-01), Sugino
patent: 4683524 (1987-07-01), Ohta
patent: 4769750 (1988-09-01), Matsumoto et al.
patent: 4787013 (1988-11-01), Sugino et al.
patent: 4851978 (1989-07-01), Ichihara

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