Projector with reduced ghost image occurrence

A projector, comprising:

• a light source that emits a light beams;
• an illumination lens unit that comprises one or more lenses that shape and focus the light beam emitted from the light source to form an illumination light beam for forming an image;
• a display device that modulates the incident illumination light beam based on a driving signal and thus forms the image;
• a projection lens unit that comprises one or more lenses that project the image formed by the display device on a screen;
• a field lens having a positive refractive power for focusing the illumination light beam on the display device, the field lens comprising a first lens surface on which the illumination light beam is incident and a second lens surface on which the image formed by the display device is incident;
• and
• a reflection member that changes a path of the illumination light beam having passed through the illumination lens unit into a direction of the field lens;
• wherein the first lens surface has a shape that reflects a portion of the illumination light beam into a path that avoids the projection lens unit when the portion of the illumination light beam is reflected;
• and
• wherein the field lens has a shape that is convex toward the display device;
• and
• wherein the field lens is a plano-convex lens of which the first lens surface is flat and the second lens surface is convex.

A projector, comprising:

• a light source that emits a light beam;
• an illumination lens unit that comprises one or more lenses that shape and focus the light beam emitted from the light source to form an illumination light beam for forming an image;
• a display device that modulates the incident illumination light beam based on a driving signal and thus forms the image;
• a projection lens unit that comprises one or more lenses that project the image formed by the display device on a screen;
• a field lens having a positive refractive power for focusing the illumination light beam on the display device, the field lens comprising a first lens surface on which the illumination light beam is incident and a second lens surface on which the image formed by the display device is incident;
• and
• a reflection member that changes a path of the illumination light beam having passed through the illumination lens unit into a direction of the field lens;
• wherein the first lens surface has a shape that reflects a portion of the illumination light beam into a path that avoids the projection lens unit when the portion of the illumination light beam is reflected;
• and
• wherein the field lens has a shape that is convex toward the display device;
• wherein the field lens is a biconvex lens and an absolute value of a radius of curvature of the first lens surface is greater than a radius of curvature of the second lens surface.