Patent ID: 8503077
Filing Date: 2013-08-06
Classification: G02B

Abstract:
1. A tube unit for microscopes, the tube unit being angularly adjustable providing a tilt angle, the tube unit positioned above a microscope lens, the tube unit comprising: tube lens with overall positive refractive power and a focal length f, including two focusing components separated by an air path, wherein the air path is at least half as long as the focal length f of the tube lens; and a roof edge mirror comprising two adjacent mirrors having a roof edge therebetween one of the two mirrors being a tilting mirror tiltable with respect to the other of the two mirrors, the roof edge mirror being positioned between the two focusing components of the tub lens, wherein when the tube unit is angularly adjusted providing a tilt angle, the tilt angle of the tilting mirror corresponds to half of the tilt angle of the tube unit; wherein the two focusing components comprise a first component comprising a single lens unit positioned between the microscope lens and the roof edge mirror, and a second component comprising only two lenses positioned between the roof edge mirror and a prism group.