JPS63195677U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a sectional view of essential parts of an optical information recording disk according to the first embodiment of the present invention, FIG. 2 is a plan view of the optical information recording disk according to the first embodiment, and FIG. FIG. 4 is a perspective sectional view of a hub and holder applied to the optical information recording disk, FIG. 4 is a sectional view showing another example of the hub and holder applied to the optical information recording disk of the first embodiment, and FIG. FIG. 6 is a sectional view showing still another example of the hub and holder applied to the optical information recording disk of the first embodiment, and FIG. 6 compares the magnitude of retardation that occurs in the present product and the conventional product under the same conditions. Graphs, Figures 7 and 8 are from the second
Plan and cross-sectional views of the hub and holder applied to the optical information recording disk of the embodiment, FIGS. 9 and 10
The figures are a plan view and a sectional view of a hub and a holder applied to the optical information recording disk of the third embodiment, and FIG. 11 is a perspective sectional view of the hub and holder applied to the optical information recording disk of the fourth embodiment. FIG. 12 is a sectional view showing a first example of a conventionally known optical information recording disk, and FIG. 13 is a sectional view showing a second example of a conventionally known optical information recording disk. 1: Substrate, 1a: Center hole, 2: Guide track,
3: Recording film, 4: Hub, 5: Holder, 6: Spindle hole, 7: Easily deformable part, 11: Slit, 12
: Connection piece, 21: Inner peripheral member, 22: Outer peripheral member, 2
3: Connecting piece, 31: Joint part, 32: Holding part, 33
: Connecting part.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An optical device in which a metal hub with a spindle hole in the center and a resin holder integrally formed on the outer periphery is attached to the center of the outer surface of a substrate. In the information recording disk, an easily deformable portion is formed in a part of at least one of the hub and the holder to absorb dimensional changes caused by differences in expansion coefficients between the hub and the substrate and between the hub and the holder. An optical information recording disk featuring: (2) Utility Model Registration The optical information recording disk according to claim (1), characterized in that the hub has a bent portion concentric with the spindle hole. (3) The optical information recording disk according to claim (2) of the utility model registration, characterized in that the bent portion is formed in a plurality of stripes in a circumferential direction centering on the spindle hole. . (4) In the optical information recording disk described in claim (2) of the utility model registration, a radial slit is provided in the middle portion of the hub excluding the inner and outer peripheral portions, and two adjacent slits are provided. An optical information recording disk characterized in that the bent portion is formed on a connecting piece formed by. (5) In the optical information recording disk according to claim (1) of the utility model registration, the hub includes a ring-shaped inner circumference, a ring-shaped outer circumference, and a thin strip connecting these inner and outer circumferences. An optical information recording disk characterized in that it is formed from a wide connecting piece. (6) In the optical information recording disk according to claim (1) of the utility model registration, the holder includes a joint part joined to the substrate, a holding part holding the hub, and the joint part and the holding part. 1. An optical information recording disk characterized in that it is formed from a thin connecting part that connects the parts. (7) The optical information recording disk according to claim (1), wherein the hub is made of ferromagnetic stainless steel. (8) The optical information recording disk according to claim (7), wherein the hub is made of SUS430 of JIS standard. (9) The optical information recording disk according to claim (7) of the utility model registration, characterized in that a magnetic plate having a thickness of 0.2 mm to 0.8 mm is used as the hub. disc.