Patent ID: 7268769

Claim:
An operation panel comprising: an operation section; and a display section which displays a content of operation effected at the operation section, wherein the display section is raised, at a predetermined angle with respect to a horizontal plane, so that the display section can be visually recognized both from a wheelchair seated position viewpoint of an adult of standard height and from a standing position viewpoint of an adult of standard height in accordance with an angle of visibility of the display section, while the operation panel is attached to an apparatus main body, and the predetermined angle of the display section satisfies the following expression: 90 + α - tan - 1 ⁢ ⁢ z - x L ≥ A ≥ 90 - α + tan - 1 ⁢ ⁢ x - y L ( 1 ) wherein A is the predetermined angle of the display section, x is a height (in millimeters) of the display section measured from a floor, y is a height (in millimeters) of the wheelchair seated position viewpoint measured from the floor, z is a height (in millimeters) of the standing position viewpoint measured from the floor, L is a horizontal distance (in millimeters) between the display section and the viewpoints, and α is the angle of visibility that is an angle (in degrees) formed between a line normal to a display surface of the display section and a visibility range limit.