| 摘要 |
PURPOSE:To make a disk inexpensive and also enable to exchange a recording layer only, by constituting so that two supporting plates are formed so as to have larger diameter than a recording sheet, to support it between both their surfaces, and also to be detachable. CONSTITUTION:A recording sheet 1 consists of a heat sensitive recording material, and is formed in the form of a disk. Also, the supporting plate 2 and 3 provided on both the lower surface and the upper surface of the recording sheet 1 consist of a transparent disk made of glass, and are formed so as to have large diameter than the recording sheet 1. And, three pieces are layered in order of the supporting plate 2, the recording sheet 1 and the supporting plate 3, and the three pieces are fixed by pouring an adhesive agent 4 into the space between the opposed surfaces of the marginal part of the supporting plates 2, 3. In this way, information is recorded by irradiating a laser beam from the supporting plate 2 side or 3. Also, in case when the whole surface of recording is erased or reproduced, the supporting plates 2, 3 are detached by soaking the optical disk 5 into an organic solvent and melting the adhesive agent 4. And, only a recording sheet 1 whose unit price is inexpensive is replaced. According to such a constitution, a disk is made inexpensive, and also a recording layer only can be replaced. |
