| 摘要 |
PURPOSE:To blacken and process many areas one without generating a microcrack at a thermal insulating layer by making the stripe direction of interfering light overlapped and formed by halving one single wavelength light parallel to the circumferential direction of a light information recording carrier in a delecting type light information recording carrier utilizing phase transferring. CONSTITUTION:A light information recording carrier 1 is connected to a variable speed motor through a column, the pillar can be shifted in the straight line direction to a pick-up, a rotation is controlled constantly to a linear velocity, the conditions on the light information recording carrier 1 at the time of blackening and processing are the same and nonuniformity does not occur. A blackening processing light 3 is halved and overlapped and made into the interfering light and converged onto the light information recording carrier 1 before the light arrives at a converging lens 2. At this time, it is necessary to obtain a defocusing condition and the interfering stripe direction of a blackening processing light is made parallel to the circumferential direction of the light information recording carrier 1. The interfering stripe pitch is 20mum or below and the microcrack of the thermal insulating layer of the light information recording support 1 does not occur at the time of the blackening processing. |
