Patent ID: 7283296

Claim:
A surgical microscope comprising: a microscope portion including an observation mechanism; a base bottom portion in which a first horizontal rotation axis extending in a substantially horizontal direction is arranged; a horizontal movement arm portion which is supported by the base bottom portion to be revolvable around the first horizontal rotation axis and in which a second horizontal rotation axis extending in the substantially horizontal direction is arranged and which moves the microscope portion in the substantially horizontal direction; a vertical movement arm portion which is supported by the horizontal movement arm portion to be revolvable around the second horizontal rotation axis, supports the microscope portion and moves the microscope portion in a substantially vertical direction; a first elastic force generation mechanism which is connected with the base bottom portion and the horizontal movement arm portion, and generates an elastic force which offsets a rotation moment around the first horizontal rotation axis produced when the horizontal movement arm portion revolves around the first horizontal rotation axis; and a second elastic force generation mechanism which is connected with the base bottom portion and the vertical movement arm portion, and generates an elastic force which offsets a rotation moment around the second horizontal rotation axis produced when the vertical movement arm portion revolves around the second horizontal rotation axis, wherein the second elastic force generation mechanism includes: a link member revolvably supported by the base bottom portion; a coupling link which couples the vertical movement arm portion with the link member to transmit a moment from the vertical movement arm portion to the link member; and an elongated second elastic member having one end portion connected with the link member and the other end portion connected with the base bottom portion, and the second elastic member is configured to elastically expand/contract in a longitudinal direction thereof when the vertical movement arm portion revolves around the second horizontal rotation axis.