| 摘要 |
A flat panel light source (100) for a transillumination device of a microscope comprises a plate-shaped light guide (110) having a lower and an upper boundary surface, and at least one lateral surface (113 to 116), and having at least one light-emitting means (120, 122) arranged to radiate light into the light guide (110) from at least two different directions, via at least one lateral surface serving as a light entrance surface, such that the light propagates in the light guide (110) as a result of total reflection, the total reflection being disrupted in defined fashion, by an element (140) abutting against a contact surface at the lower boundary surface of the light guide (110), so that an outcoupling of light occurs on the upper boundary surface of the light guide (110), the planar area of the contact surface being smaller than the planar area of the lower boundary surface.
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