| 摘要 |
<p>PURPOSE:To accurately position a solid-state scanning type optical head with respect to a medium to be exposed and to extend the life of the medium to be exposed by a method wherein two rollers provided in the vicinity of both end parts of the solid-state scanning type optical head are provided so as to be mutually shifted in the rotary axis direction of the medium to be exposed. CONSTITUTION:Two rollers 2a1, 2a2 or rollers 2b1, 2b2 are arranged to the posts 5a, 5b provided to a solid-state scanning type optical head 3 so as to be respectively shifted in the direction of rotary shaft (b) of a medium 1 to be exposed and the rolling tracks on the medium 1 to be exposed by two rollers 2a1, 2a2 or rollers 2b1, 2b2, are not overlapped with each other. Therefore, the abrasion speed of the medium 1 to be exposed due to the rollers 2a1, 2a2, 2b1, 2b2 can be reduced to half or less. Further, the shift width of the rollers 2a1, 2a2 or 2b1, 2b2 is reduced to such a degree that the rolling tracks are not overlapped one upon another. As a result, the positioning function of the solid-state scanning type optical head 3 to the medium to be exposed by four rollers 2a1, 2a2, 2b1, 2b2 is not damaged and the solid-state scanning type optical head 3 can be accurately positioned.</p> |
