Light homogenizing module and projection device

A projection device, comprising an illumination system, at least one light valve, and a projection lens, wherein:

• the illumination system is used to provide an illumination beam;
• the at least one light valve is disposed on a transmission path of the illumination beam from the illumination system and is used to convert the illumination beam into an image beam;
• and
• the projection lens is disposed on a transmission path of the image beam and is used to project the image beam out of the projection device,
• wherein the illumination system comprises a light source module and a light homogenizing module, the light source module is used to provide the illumination beam, the light homogenizing module is disposed on the transmission path of the illumination beam and is used to receive and homogenize the illumination beam, and the light homogenizing module comprises a light homogenizing element and a light shielding element, wherein:
• the light homogenizing element comprises a light incident surface and an axis perpendicular to the light incident surface;
• and
• the light shielding element is disposed on a side of the light incident surface, and the light shielding element comprises a first reflection portion, at least one second reflection portion, and a light entrance, where:
• the first reflection portion surrounds the light entrance;
• the at least one second reflection portion has a first end portion and a second end portion opposite to each other, the first end portion of the at least one second reflection portion is connected to the first reflection portion, and the second end portion of the at least one second reflection portion is farther away from the light homogenizing element than the first reflection portion;
• and
• the light entrance exposes the light incident surface, wherein an extension direction of the first reflection portion is parallel to the light incident surface, and in a direction parallel to the light incident surface, a distance between the second end portion of the at least one second reflection portion and the axis is less than or equal to a distance between the first end portion of the at least one second reflection portion and the axis.