Patent ID: 6853481
Filing Date: 2005-02-08
Classification: G02B

Abstract:
1. A microscope comprising: a base which is made of a first aluminum alloy; a frame which is made of ceramic-containing a second aluminum alloy that has a lower coefficient of thermal expansion than said first aluminum alloy, provided on said base and which supports a stage for mounting a specimen; an arm which is made of said first aluminum alloy, provided on said frame and which supports an objective lens; an observation optical system which is provided on said arm; an illumination optical system which is integrated with said arm and which has a light source for illuminating said specimen; a power supply which is provided in said frame and which turns on said light source; a protrusion portion which diminishes a contact area between said frame and said arm and which is formed on said frame to reduce focal point shift due to thermal expansion caused by said-illumination optical system; and a bolt which fastens said arm and said protrusion portion of said frame together to establish a contact state.