JPH0235378U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a perspective sectional view showing the overall structure of the optical information recording disk according to the first embodiment, FIG. 2 is a sectional view showing main parts in detail of the magnetic metal hub setting section, and FIGS. 3 to 7 are 8 and 9 are cross-sectional views of essential parts of optical information recording disks according to the second, third, fourth, fifth, and sixth embodiments.
The main part plan views of the optical information recording disks according to the embodiment and the eighth embodiment, FIGS. 10 and 11 are shown in FIG.
FIG. 12 is a perspective sectional view of an optical information recording disk according to an embodiment and a tenth embodiment, and FIG. 12 is a perspective sectional view of a conventional optical information recording disk. 1: Glass substrate, 2: Center hole, 3: Magnetic metal hub, 4: Signal pattern, 5: Resin layer, 6: Recording layer, 7: Protective layer, 8: First half, 9: Second half, 10: Fitting portion, 11: Flange portion, 12: Through hole, 13: Spindle hole, 15: Adhesive layer, 17: Spot welding, 18: Continuous welding.

Claims (1)

[Claims for Utility Model Registration] (1) In an optical information recording disk having a magnetic metal hub for a magnetic clamp in the center of a glass substrate, the magnetic metal hub is attached to a first half attached to the glass substrate. and a second half that is attached to the first half and into which a rotating spindle provided in the disk drive device is inserted, and the first half has a thermal expansion coefficient difference of ±± with respect to the glass substrate. 1. An optical information recording disk, characterized in that the second half is made of a metal material having a corrosion resistance and wear resistance superior to that of the first half. (2) The optical information recording disk according to claim 1, wherein a gap is formed between the second half and the glass substrate to absorb at least a difference in thermal expansion between the two members. recording disk. (3) The optical information recording disk according to claim 1, wherein the first half is made of special ferrite stainless steel containing 42% nickel and 6% chromium. (4) The optical information recording disk according to claim 1, wherein the second half is made of a metal material selected from the group of ferritic stainless steel and martensitic stainless steel. disc. (5) In the optical information recording disk according to claim 1, the second half is made of SUS4 according to Japanese Industrial Standards.
An optical information recording disk characterized in that it is made of 30 ferrite stainless steel. (6) The optical information recording disk according to claim 1, wherein the first half and the second half are bonded to each other via an adhesive layer. (7) The optical information recording disk according to claim 6, wherein the adhesive layer has a thickness of 10 μm or more and a transverse elastic modulus of 2000 g/cm ² or less. (8) In the optical information recording disk according to claim 6, the adhesive constituting the adhesive layer is an adhesive selected from an anaerobic adhesive, an epoxy adhesive, and a urethane adhesive. Characteristic optical information recording disk. (9) The optical information recording disk according to claim 1, wherein the first half and the second half are joined by welding. (10) The optical information recording disk according to claim 9, wherein only the inner peripheral portions of the first half and the second half are welded. (11)11 In the optical information recording disk according to claim 1, a spindle hole is provided in the second half, and a through hole having a larger diameter than the spindle hole is provided in the first half, and these An optical information recording disk characterized in that a spindle hole and a through hole are arranged concentrically. (12)12 In the optical information recording disk according to claim 11, the first half and the second half are formed in a ring shape, and the second half is attached to one side of the first half. An optical information recording disk characterized by: 〓(13)13〓 In the optical information recording disk according to claim 11, a part of the second half is inserted into a through hole formed in the first half, and the first half and the second half are inserted into a through hole. An optical information recording disk characterized by integrating two halves of. (14) 14 The optical information recording disk according to claim 11, wherein a tapered surface is formed at an edge portion of the spindle hole and the through hole on the spindle insertion side. (15) 15 The optical information recording disk according to claim 11, wherein the second half is disposed on the laser beam incident surface side of the glass substrate. (16) 16 The optical information recording disk according to claim 11, wherein the second half is disposed on the signal surface side of the glass substrate.