Optical device and projector

An optical device, comprising:

• a housing;
• a light source;
• a first reflecting mirror;
• a lens module;
• a second reflecting mirror;
• and
• a projection lens;
• wherein the housing is sealed;
• the light source, the first reflecting mirror, the lens module, the second reflecting mirror, and the projection lens are arranged in the housing;
• the first reflecting mirror is adjacent to one side of the light source;
• the second reflecting mirror is arranged above the first reflecting mirror;
• the projection lens is adjacent to one side of the second reflecting mirror and is arranged above the light source;
• the lens module is arranged between the first reflecting mirror and the second reflecting mirror;
• light emitted by the light source is reflected by the first reflecting mirror and passes through the lens module to reach the second reflecting mirror;
• then the light is reflected to the projection lens through the second reflecting mirror;
• a condenser lens is arranged between the light source and the first reflecting mirror;
• the lens module comprises a first lens, a reflective polarizer, a liquid crystal screen, and a second lens;
• the first lens, the reflective polarizer, the liquid crystal screen, and the second lens are sequentially arranged from bottom to top and are arranged parallel to each other;
• wherein the housing comprises at least two shells;
• the at least two shells are connected by buckles;
• an interior of the housing defines a first cavity, a lens module mounting cavity, an image display module mounting cavity, and second cavity sequentially provided from top to bottom;
• wherein the second reflecting mirror is arranged on a left end of the first cavity;
• a right end of the first cavity defines a lens mounting opening;
• the projection lens is connected to the lens mounting opening to seal the lens mounting opening;
• wherein the second lens and the liquid crystal screen are arranged inside the lens module mounting cavity;
• wherein the reflective polarizer and the first lens are arranged inside the image display module mounting cavity;
• wherein a cooling fan, the first reflecting mirror, the condenser lens, and the light source are sequentially arranged inside the second cavity from left to right a radiator is arranged on a position of an outer side wall of the housing corresponding to the light source;
• a left end of the second cavity defines a first opening;
• a right end of the lens module mounting cavity and a right end of the image display module mounting cavity separately define a second opening;
• a left end of the lens module mounting cavity defines a third opening;
• a first heat dissipating plate is connected to the first opening and the third opening to seal the first opening and the third opening;
• a second heat dissipating plate is connected to the second opening of the lens module mounting cavity and the second opening of the image display module mounting cavity to seal the second opening of the lens module mounting cavity and the second opening of the image display module mounting cavity;
• wherein an air outlet of the cooling fan is communicated with a left end of the image display module mounting cavity;
• a speaker box is arranged on a position of the outer side wall of the housing corresponding to the second reflecting mirror;
• a mainboard is arranged above the speaker box.