JPH0439877U

JPH0439877U -

Info

Publication number: JPH0439877U
Application number: JP7928090U
Authority: JP
Priority date: 1990-07-27
Filing date: 1990-07-27
Publication date: 1992-04-03

Description

[Brief explanation of drawings]

第１図ａは本考案の実施例において例示したハ
ードジヤケツトに収納されたフロツピデイスクの
断面構成を示す模式図、第１図ｂは第１図ａのＡ
−Ａ矢視図、第２図は実施例において用いたフロ
ツピデイスクの断面構成を示す模式図、第３図ａ
は比較例１において例示したハードジヤケツトに
収納されたフロツピデイスクの断面構成を示す模
式図、第３図ｂは第３図ａのＢ−Ｂ矢視図、第４
図ａは比較例２において例示したハードジヤケツ
トに収納されたフロツピデイスクの断面構成を示
す模式図、第４図ｂは第４図ａのＣ−Ｃ矢視図で
ある。１……ハードジヤケツト、２……フロツピデイ
スク、３……ヘツド挿入窓（ウインドウ）、４…
…突起部（外側）、５……突起部（内側）、６…
…パツド、７……ポリイミドフイルム基体、８…
…Ｃｏ−Ｃｒ垂直磁化膜、９……熱酸化保護膜、
１０……潤滑膜、１１……パツド挿入窓。 FIG. 1a is a schematic diagram showing the cross-sectional configuration of a floppy disk housed in a hard jacket illustrated in an embodiment of the present invention, and FIG. 1b is a schematic diagram showing A of FIG.
2 is a schematic diagram showing the cross-sectional structure of the floppy disk used in the example, and 3 is a view in the direction of arrow A.
3 is a schematic diagram showing the cross-sectional structure of the floppy disk housed in the hard jacket illustrated in Comparative Example 1, FIG.
Figure a is a schematic diagram showing the cross-sectional structure of the floppy disk housed in the hard jacket exemplified in Comparative Example 2, and Figure 4b is a view taken along the line CC in Figure 4a. 1...hard jacket, 2...floppy disk, 3...head insertion window (window), 4...
...Protrusion (outside), 5...Protrusion (inside), 6...
...Pad, 7...Polyimide film base, 8...
...Co-Cr perpendicular magnetization film, 9...thermal oxidation protective film,
10... Lubricating film, 11... Pad insertion window.

Claims

[Claims for Utility Model Registration] 1. In a disk recording medium in which a floppy disk is rotatably housed in a hard jacket having a flat gap, the size of the head insertion window provided in the jacket is determined by the size of the head insertion window provided in the jacket. Means is configured to be smaller than the size of the pad insertion window arranged substantially opposite to the window, and to suppress the surface runout of the floppy disk by receiving the pressure from the pad on the floppy disk on the inner surface of the jacket in the peripheral area of the head insertion window. A disk recording medium comprising: 2. In claim 1, a part of the pad surface inserted through the pad insertion window during recording and reproduction is located at a position opposite to a part of the inner surface of the jacket in the peripheral area of the head insertion window. disk recording medium. 3. In claim 1 or 2, the floppy disk is released from the gap between the pad surface inserted through the pad insertion window during recording and reproduction and the inner surface of the jacket at the peripheral portion of the head insertion window opposite to the pad surface. The distance after subtracting the thickness is 0.01~
A disk recording medium characterized in that it is configured to have a diameter of 0.5 mm. 4. In claim 1 or 2, the pad surface inserted through the pad insertion window during recording and reproduction, and the protrusion provided on the inner surface of the jacket around the head insertion window opposite to the pad surface. A disk recording medium characterized in that the distance obtained by subtracting the thickness of the floppy disk from the distance is 0.01 to 0.5 mm. 5. A disk recording medium according to claim 4, characterized in that the protrusion provided on the inner surface of the jacket around the head insertion window is provided on the outer circumference side, the inner circumference side, or both sides of the head insertion window.