Patent ID: 9297993
Filing Date: 2016-03-29
CPC Classification: G02B

Claim Text:
1. A ring illumination device for a microscope objective, comprising: at least two light emitting diode units accommodated in an illumination ring contained within the ring illumination device, wherein the ring illumination device is configured to encompass and to directly attach to the microscope objective, the ring illumination device including at least one lower entrance opening and at least one upper outlet opening of a passage within the ring illumination device for cooling air, to cool the at least two light emitting diode units by a chimney effect such that the passage is configured to draw cool air through the at least one lower entrance opening in the ring illumination device to exit through the at least upper outlet opening in the illumination device to generate a cooling air flow around the at least two light emitting diode units in the illumination ring contained within the ring illumination device.