Patent ID: 8200073

Claim:
A dental treatment observation system comprising: a stand including a parallel linkage provided with first and second parallel sub-linkages, the parallel linkage having first and second link elements that face each other and third and fourth link elements that face each other, the first link element being rotatably fixed at a stand body, the fourth link element supporting a counterweight, a support arm being fixed to the third link element, and a front link rotatably fixed at the support arm, the first parallel sub-linkage having fifth and sixth link elements that face each other and seventh and eighth link elements that face each other, the fifth link element being fixed relative to the first link element, the eighth link element being positionally fixed to the stand body, the second parallel sub-linkage defined by four link elements including ninth and tenth link elements that face each other, the ninth link elements being fixed relative to the seventh link elements, the tenth link elements being positionally fixed to the front link; a first auxiliary arm attached to the front link and configured to movably and rotatably support a photographing unit that stereoscopically photographs an object and provides a pair of left and right images of the object having a binocular parallax, the first auxiliary arm including third and fourth parallel sub-linkages, the third parallel sub-linkage having four link elements including eleventh and twelfth link elements that face each other, the eleventh link element being positionally fixed to the front link, the fourth parallel sub-linkage having four links including thirteenth and fourteenth link elements that face each other, the thirteenth link elements being positionally fixed to the twelfth link element, the photographing unit being positionally fixed to the fourteenth link; and a second auxiliary arm attached to the front link and configured to movably and rotatably support a stereoscopic display unit that displays the pair of left and right images on internal display panels so that the images are stereoscopically observed through a pair of eyepieces, the second auxiliary arm including fifth and sixth parallel sub-linkages, the fifth parallel sub-linkage having four link elements including fifteenth and sixteenth link elements that face each other, the fifteenth link element being positionally fixed to the front link, the sixth parallel sub-linkage having four link elements including seventeenth and eighteenth link elements that face each other, the seventeenth link element being fixed relative to the sixteenth link element, the stereoscopic display unit being positionally fixed to the eighteenth link element.