Abstract: A golf club of which hand grip part is built-in with advertising print layer, which can be viewed easily, protected from damage, wherein its image is enhanced for clearer view. A grip member is formed with a hole and combines with shaft top. A print layer displays advertisement on the outside of the grip member. A transparent layer covers and shows the print layer.

Abstract: An optical projection system, displaying an image of pixels on a projection screen, includes a light source for generating a white light beam, wherein the white light beam has a first, a second and a third primary light components, each of the primary light components being one of the primary colors, a pixel filter for filtering the white light beam into each of the primary light beams of each of the primary light components, wherein the pixel filter made of a set of R, G, B color sections, and an array of M.times.N actuated mirrors provided with an active matrix, M and N being positive integers, respectively, each of the actuated mirrors being capable of reflecting the white light beam from the light source to any one of the color sections and modulating an intensity of the light beam passing through the pixel filter in response to an electric signal applied to the active matrix.

Abstract: An improved optical baffling device for use with an optical projection system has a base; a plurality of flat reflective surfaces of an equal size on a corresponding member of reflectors mounted on the base, the reflective surfaces being substantially parallel to each other; and the corresponding number of slits disposed in an alternating relationship with the reflective surfaces. A fraction of light from a light source is focused on each of the reflective surfaces and transmitted to a projection screen through a corresponding slit of the optical baffling device. Sine a fraction of light is processed separately, it becomes possible to enhance the optical efficiency of the optical projection system with a reduced amount of modulation of the optical path.