| 摘要 |
An illumination device for an optical imaging apparatus, such as a microscope. The illumination of a slide specimen is achieved when divergent light for a point light source or a plurality of point light sources illuminate the specimen converging at high angles at equal brightness across all angles. The user of divergent light cancels the cosine distributed gradient effect (Lambert's cosine law) to effectively create a substantially evenly distribution of light. The placement of diffractive or diffusive film under the specimen causes the light to converge at high angles onto the specimen. The light from the point light source can be further diffused by passing it through a column having its interior coated with a non-diffractive material adapted to widely scatter the light.
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