Lighting system and projection apparatus

A lighting system, comprising at least one light source, a depolarization element and a light homogenization element, wherein

• the at least one light source is configured to provide at least one light beam;
• the depolarization element is disposed on a transmission path of the at least one light beam;
• the depolarization element comprises a first optical element, and the first optical element comprises a first optical axis;
• the light homogenization element is configured to allow the at least one light beam to pass, so as to form an illuminating light beam, wherein the incidence direction where the at least one light beam is transmitted to the first optical element is not parallel to the first optical axis, and the depolarization element is located between the at least one light source and the light homogenization element;
• the depolarization element also comprises a second optical element comprising a second optical axis, and the first optical axis is not parallel to the second optical axis;
• and
• the shape of the first optical element and the shape of the second optical element are in geometrical symmetry.

A lighting system, comprising at least one light source, a depolarization element and a light homogenization element, wherein

• the at least one light source is configured to provide at least one light beam;
• the depolarization element is disposed on a transmission path of the at least one light beam;
• the depolarization element comprises a first optical element, and the first optical element comprises a first optical axis;
• the light homogenization element is configured to allow the at least one light beam to pass, so as to form an illuminating light beam, wherein the incidence direction where the at least one light beam is transmitted to the first optical element is not parallel to the first optical axis, and the depolarization element is located between the at least one light source and the light homogenization element;
• the depolarization element also comprises a second optical element comprising a second optical axis, and the first optical axis is not parallel to the second optical axis;
• and
• the material of the second optical element is different from the material of the first optical element.

A projection apparatus, comprising a lighting system, at least one light valve and a projection lens, wherein

• the lighting system is configured to provide an illuminating light beam, the lighting system comprises at least one light source, a depolarization element and a light homogenization element;
• the at least one light source is configured to provide at least one light beam;
• the depolarization element is disposed on a transmission path of the at least one light beam;
• the depolarization element comprises a first optical element, and the first optical element comprises a first optical axis;
• the depolarization element also comprises a second optical element comprising a second optical axis, and the first optical axis is not parallel to the second optical axis;
• the first optical element comprises a first light entering surface and a first light exiting surface which are not parallel to each other, and the second optical element comprises a second light entering surface and a second light exiting surface which are not parallel to each other;
• the first light exiting surface is parallel to the second light entering surface;
• and the first light entering surface is parallel to the second light exiting surface;
• the light homogenization element is configured to allow the at least one light beam to pass, so as to form an illuminating light beam, wherein the incidence direction where the at least one light beam is transmitted to the first optical element is not parallel to the first optical axis, and the depolarization element is located between the at least one light source and the light homogenization element;
• the at least one light valve is disposed on a transmission path of the illuminating light beam and configured to convert the illuminating light beam into an image light beam;
• and
• the projection lens is disposed on a transmission path of the image light beam and configured to form the image light beam into a projection light beam.