Illuminated keyboard

An illuminated keyboard, comprising:

• a supporting plate;
• an electrical circuit unit disposed above said supporting plate, and including
• a bottom circuit membrane disposed adjacent to said supporting plate, and having a bottom conductive portion,
• an intermediate partition plate disposed above said bottom circuit membrane, and having an intermediate through hole aligned with said bottom conductive portion and a plurality of bottom perforated holes surrounding said intermediate through hole, and
• a top circuit membrane disposed above said intermediate partition plate, and having a top conductive portion aligned with said intermediate through hole and said bottom conductive portion, and a plurality of top perforated holes surrounding said top conductive portion;
• a light emitter unit disposed on said bottom circuit membrane and including a plurality of light emitters surrounding said bottom conductive portion, each of said plurality of light emitters protruding through a respective one of said bottom perforated holes toward a respective one of said top perforated holes;
• a light diffusion layer disposed above said top circuit membrane and having a light transmission region for transmitting light rays generated from said plurality of light emitters;
• an elastic member made of an elastic material, aligned with said top conductive portion and disposed above and on said light diffusion layer;
• a bridging unit disposed above said light diffusion layer and aligned with said elastic member;
• and
• a keycap disposed above and connected to said bridging unit, said elastic member elastically abutting against said keycap, said keycap being light permeable.