Abstract: In a transmission type screen and other optical devices formed by combining optical sheets such as a Fresnel lens sheet and a lenticular lens sheet, the generation of stray light and defective appearance caused by a friction-reducing agent are prevented. In the optical devices such as a transmission type screen 3 formed by combining a plurality of optical sheets such as a Fresnel lens sheet 1 and a lenticular lens sheet 2, a friction-reducing agent 20 is provided on a surface of at least one of the optical sheets at a thickness of 0.3 nm or more to 10 nm or less. A coating applicator 30 for the friction-reducing agent 20 includes: a transfer roller 31; coating liquid-supplying means 32 for supplying the coating liquid 20 to the transfer roller 31; and scraping means 35 for adjusting the thickness of the coating liquid 20 adhering to the transfer roller 31. In the coating liquid 30, the surface roughness Ra (JIS B 0601-1982) of the transfer roller 31 is set to 0.01 to 1 ?m.

Abstract: In a transmission type screen and other optical devices formed by combining optical sheets such as a Fresnel lens sheet and a lenticular lens sheet, the generation of stray light and defective appearance caused by a friction-reducing agent are prevented. In the optical devices such as a transmission type screen 3 formed by combining a plurality of optical sheets such as a Fresnel lens sheet 1 and a lenticular lens sheet 2, a friction-reducing agent 20 is provided on a surface of at least one of the optical sheets at a thickness of 0.3 nm or more to 10 nm or less. A coating applicator 30 for the friction-reducing agent 20 includes: a transfer roller 31; coating liquid-supplying means 32 for supplying the coating liquid 20 to the transfer roller 31; and scraping means 35 for adjusting the thickness of the coating liquid 20 adhering to the transfer roller 31. In the coating liquid 30, the surface roughness Ra (JIS B 0601-1982) of the transfer roller 31 is set to 0.01 to 1 ?m.

Abstract: A transparent lightguide (3) which guide light at least from one side end plane is characterized in that a large number of speckled, solid-line shaped or broken-line shaped protruding patterns whose cross-sectional width W (&mgr;m) at a cross section perpendicular to the axis of a linear light source is 10≦W≦200 are arranged on a light emitting surface at a low density in a region close to the linear light source and at a high density in a region far from the linear light source so as to make the luminance distribution of the light emitted from the light emitting surface approximately uniform. Here, the cross section of the protruding pattern is preferable to be approximately trapezoidal while having a straight part partially and the ratio H/W to be 0.2≦H/W≦1.0, where W and H denote cross-sectional width and height of the protruding pattern, respectively, or the cross section of the protruding pattern is preferable to be approximately circular-arc and the ratio H/W to be 0.2≦H/W≦0.

Abstract: The present invention includes the steps of forming a stamper with a fine and delicate relief pattern formed thereon by forming a photo resist layer on a flat substrate, exposing the photo resist, developing the exposed photo resist, metallizing and electroforming the surface of the photo resist, and of injection molding the light-transmitting plate using said stamper.