Abstract: A lighting apparatus. The lighting apparatus comprises a light source, a hollow hollow module, and a rectangular lens. The hollow module has a concave, a opening, and an inner reflective surface. The light source is disposed in the concave. The rectangular lens with a semi-translucent incident surface and a display surface is seated in the opening. Light rays emitted from the light source are reflected by the inner surface. Subsequently, the light rays enter the incident surface and exit the lens through the display surface.

Abstract: The present invention provides an optical system. The optical system includes a first optical apparatus, a second optical apparatus, and a thrust member. A side of the first optical apparatus has a rest. The second optical apparatus is disposed between the first optical apparatus and the thrust member. With the optical system, the second optical apparatus is pressed against the rest by means of the force of the thrust member to keep the relative position between the first optical apparatus and the second optical apparatus stable.

Abstract: The present invention provides an optical system. The optical system includes a first optical apparatus, a second optical apparatus, and a thrust member. A side of the first optical apparatus has a rest. The second optical apparatus is disposed between the first optical apparatus and the thrust member. With the optical system, the second optical apparatus is pressed against the rest by means of the force of the thrust member to keep the relative position between the first optical apparatus and the second optical apparatus stable.

Abstract: The present invention provides a cover structure and an image output apparatus including the cover structure. The cover structure may be disposed on the image output apparatus for discharging and guiding the heated airflow inner the image output apparatus. The cover structure includes a first device and a second device. The first device is disposed on a housing of the image output apparatus and corresponds to a blowhole of the housing to mask a portion of the light emitted from the blowhole. The other portion of the light leaks from the first device to form a leakage light. The second device corresponds to an outer side of the first device to mask the leakage light.