Abstract: A kit for making an original holder is disclosed. In the kit, a holder 10 of A4 size with a paper fastener 7 is divided into two and provided as two members 11 and 12. The member 11, consisting of a front panel 1 isolated from other portions of the holder cover, is a substantially flat paper sheet and generally rectangular in standardized lengthwise A4 size which is adapted to be passed through common personal printers easily. The member 12 consists of the rest of the holder cover and a paper fastener 7. The rest of the cover is made with a single paper sheet in which a back panel 2, a spine panel 3, a pleat 4 and a joint portion 5 are defined by folding the sheet, and the paper fastener 7 is secured on the pleat 4. A double-coated adhesive tape 6 is adhesively bonded on the outside surface of the joint portion 5 along a line a—a. Upon making the holder 10 with this kit, the member 11 is fed through a printer and any desired designs are printed thereon.

Abstract: A displacement detecting system comprises an optical detector which includes a one-chip optical IC having a laser light source, light receiving elements for generating, in response to laser light reflected by a surface to be measured, a focus error signal indicative of a deviation of a distance between the surface and an objective lens from a focal length thereof, and a prism.