Led light source capable of projecting graphic logo and red dot sight thereof

A red dot sight provided with a light emitting diode (LED) light source comprising a point light source and a peripheral light source around the point light source, the peripheral light source being a discontinuous line light source, said red dot sight comprising:

• a housing;
• and
• a dustproof cover placed on a light outlet hole on the housing, the dustproof cover comprising:
• an annular front cover,
• an annular base threadedly coupled to one end of the annular front cover,
• a cover plate coupled to an ear hole on the annular base through a core shaft, and
• a washer provided between the annular front cover and the annular base, wherein
• the cover plate is coupled to the ear hole through a support bar;
• the support bar comprises:
• a connecting pipe and a connecting rod coupled to the annular base,
• a first return spring and a second return spring sleeved on the connecting rod, and
• a first clamp spring and a second clamp spring;
• one end of the connecting rod is fixedly connected to a circumferential central portion of the connecting pipe;
• the connecting rod is provided with a central annular groove positioned at an axial central portion of the connecting rod and an end annular groove placed at another end of the connecting rod;
• a first fixing ring, a second fixing ring, and a third fixing ring are placed on an internal surface of the cover plate along a same diameter direction of a circle sharing a same plane with the cover plate;
• the second fixing ring is placed at a middle position between the first fixing ring and the third fixing ring;
• on an internal surface of the cover plate, a first rectangular groove and a second rectangular groove are placed at a side where the second fixing ring and the third fixing ring face toward the first fixing ring;
• the connecting rod successively passes through the first fixing ring, the second fixing ring, and the third fixing ring;
• the first return spring is placed between the first fixing ring and the second fixing ring, and the second return spring is placed between the second fixing ring and the third fixing ring;
• one end of the first clamp spring and of the second clamp spring is respectively inserted into the central annular groove and the end annular groove, and another end of the first clamp spring and of the second clamp spring is respectively inserted into the first rectangular groove and the second rectangular groove, so that the first return spring and the second return spring compressed under an action of external forces restore a static length after the external forces disappear, and meanwhile the connecting pipe tightly presses on an end face of the cover plate;
• and
• on the connecting pipe, either side of the connecting rod is provided with a clamping piece, the end face of the cover plate is provided with a limit groove fitting in with the clamping piece for limiting.