Patent ID: 7484854

Claim:
A projector to display an image by projecting projection light to a projection object, the projector comprising: an image forming section to form an image constructed by arranging plural image elements as a pattern image for the display in the projection object; a zoom lens to change the size of a projection light range projected by the projection light; a zoom lens position detecting section to detect a zoom position of the zoom lens; a control section; and a photographing section to photograph the projection object; the control section obtaining the zoom position detected by the zoom lens position detecting section, and a size of the image element in the pattern image formed in the image forming section being changed in accordance with the obtained zoom position, and the control section changing the width of a stripe element in the pattern image formed in the image forming section in accordance with the obtained zoom position so that the width of the stripe element in a photographing image photographed by the photographing section may be held approximately constant at a predetermined desirable size when the image element is a stripe element constructed by a band of a first color and a band of a second color and the pattern image being an image of a stripe constructed by arranging a plurality of the stripe elements.