Patent ID: 11231586

Abstract:
An optical apparatus into which light emitted from an image forming apparatus enters, in which the light is guided, and from which the light is emitted includes a light guide plate 30, first deflection means 41, second deflection means 42, and third deflection means 43. The first deflection means 41 deflects light incident on the light guide plate 30 in such a manner that the light is totally reflected in the light guide plate 30. The second deflection means 42 deflects the light that has propagated in the light guide plate 30 by total reflection in such a manner as to cause the light to be emitted from the light guide plate 30. The third deflection means 43 deflects the light that has been deflected by the first deflection means 41 and that has propagated in the light guide plate 30 by total reflection toward the second deflection means 42. An incident angle of the light emitted from a center point of an image forming region of the image forming apparatus on the light guide plate is an angle other than zero degrees, and a unit vector of light emitted from the center point of the image forming region of the image forming apparatus and a unit vector of this light at the time of emission from the light guide plate are opposite in direction.