A discharge bulb including: an arc tube having a light emitting portion constructed in a manner that a light emitting substance is enclosed therein by pinch-sealing the arc tube, and discharge electrodes are oppositely arranged therein; and a shroud glass tube hermetically sealing and covering the arc tube, so as to form a space between the shroud glass tube and the arc tube. According to one embodiment, multiple viewing rays are extended in a viewing direction from the image to be rendered at a view point. Apparatus is provided to control the position of a lens in relation to a reference lens. Deformation of the bladder by applied forces allows air to pass through the noisemaking device, thereby producing sound. The second input end is disposed at a radially offset distance from the second central axis, and the second output end is disposed collinearly with the second central axis. The pressure pocket is recessed relative to the pumping land and extends from the pumping land outward radially to a containment edge.