Patent ID: 7952801

Claim:
A screen comprising: a flexible screen body on which image light is projected; a fixed column arranged in a central portion; a first supporting unit and a second supporting unit arranged on the left and right of the fixed column so as to support the screen body therebetween, one of the first supporting unit and the second supporting unit including a winding member configured to wind the screen body; a first pantograph mechanism and a second pantograph mechanism each having first and second arm members connected crisscross, the first pantograph mechanism and the second pantograph mechanism being installed respectively between the fixed column and the first supporting unit and between the fixed column and the second supporting unit so as to be expandable and contractible; an arm fixing unit configured to pivotally support the first arm member of the first pantograph mechanism and the first arm member of the second pantograph mechanism with respect to the fixed column while supporting the same to be fixed in the vertical direction; an arm sliding unit configured to pivotally support the second arm member of the first pantograph mechanism and the second arm member of the second pantograph mechanism with respect to the fixed column so as to be slidable in the vertical direction, the first pantograph mechanism and the second pantograph mechanism being expanded and contracted to move the first supporting unit and the second supporting unit toward and away from each other by a sliding movement of the arm sliding unit; and an urging member configured to urge the first supporting unit and the second supporting unit to move away from each other, wherein the arm sliding unit includes a portion for fixing the second arm member of the first pantograph mechanism and the second arm member of the second pantograph mechanism to the fixed column which enables fixation of the same at a predetermined position of the fixed column.