Abstract: It is to provide an apparatus for producing a thin film, a process for producing a thin film and a guide roller, in which an arc resistant property is provided, and the film formation can be stably conducted with preventing damage of the thin film thus formed. In an apparatus for producing a thin film, such as a plasma CVD apparatus, comprising a vacuum chamber, means for generating a plasma in the vacuum chamber, means for introducing a gas to the vacuum chamber, and a guide roller for running a material to be treated by winding and supporting in the vacuum chamber, an outer peripheral surface of the guide roller in contact and sliding with the material to be treated comprises an electric conductor on both end parts in a width direction of the guide roller, and an electric insulator on a central part thereof.

Abstract: A magnetic tape guide apparatus which can guide not only a magnetic tape having an applied magnetic layer thereon but also a magnetic thin metal film magnetic tape with a high transport performance is disclosed. The magnetic tape guide apparatus comprises a magnetic tape guide drum or a guide pin having a cylindrical profile for guiding a magnetic tape along a magnetic guide face provided by an outer circumferential face thereof. The magnetic tape guide face is formed as a roughened face wherein the height .delta. of crests is selected within the range of 0.2 .mu.m to 3.0 .mu.m and the pitch x of the crests is selected so that it satisfies 0.050 mm .ltoreq.x.ltoreq.(329.delta.)1/4 mm.

Abstract: An apparatus for recording and reproducing a tape-shaped recording medium, which is capable of minimizing the effect of adsorbed water present at the interface between the tape and a sliding member and hence enables the tape to travel stably without sticking to the sliding member even under conditions close to moisture condensational conditions. An aluminum alloy is employed as a material for a sliding member such as a fixed drum, stationary tape guides, etc. on which a video tape slides, and a large number of projections are formed on the surface of the sliding member. A material of high water repellency is formed on the surface of the sliding member for the purpose of minimizing the effect of contact portions formed by the video tape and the projections of the sliding member and the effect of bonded portions of adsorbed water produced around the contact portions (at the interface).