JPH02123744U

JPH02123744U -

Info

Publication number: JPH02123744U
Application number: JP3106689U
Authority: JP
Priority date: 1989-03-18
Filing date: 1989-03-18
Publication date: 1990-10-11

Description

[Brief explanation of drawings]

第１図は本案に係るデイスククランプ装置の断
面図、第２図はその要部斜視図、第３図イ，ロは
本案に係るクランプ装置のデイスククランプ動作
を説明する断面図、第４図、第５図、第６図は従
来例を示す断面図で、第４図はデイスククランプ
機構が適用される光デイスクプレーヤの概略構成
を示している。１１……クランプアーム、２１……デイスクク
ランパ、２１１……本体部、２１２……小径軸部
、２１３……フランジ部、２２……第１のマグネ
ツト、２３……第２のマグネツト、３……センタ
リングハブ、３Ｂ……プラツタ、Ｈ，ｈ１，ｈ２
……クリヤランス。 Fig. 1 is a sectional view of the disk clamping device according to the present invention, Fig. 2 is a perspective view of the main part thereof, Figs. 5 and 6 are sectional views showing a conventional example, and FIG. 4 shows a schematic configuration of an optical disc player to which the disc clamp mechanism is applied. DESCRIPTION OF SYMBOLS 11... Clamp arm, 21... Disc clamper, 211... Main body part, 212... Small diameter shaft part, 213... Flange part, 22... First magnet, 23... Second magnet, 3... Centering hub, 3B...platter, H, h1, h2
...Clearance.

Claims

[Claims for Utility Model Registration] (1) At least the disk mounting portion is formed of a magnetic material, and includes a centering core that fits and positions the disk center hole in the center, and a spring that biases the centering core in the lifting direction. a clamp arm that moves up and down with respect to the centering hub in conjunction with disk loading and unloading operations, a clamper that is freely rotatably supported by the clamp arm, and the centering hub of the clamper. A disk clamping device including a first magnet that attracts the magnetic material to each other when the clamp arm is lowered to a predetermined position, the clamp arm being formed of a magnetic material,
A disk clamp device characterized in that the clamper is provided with a flange portion that abuts and is supported by the clamp arm, and a second magnet that contacts and attracts a surface of the clamp arm is attached to the flange portion. (2) The arrangement is set so that when the clamper clamps the disk between the clamp arm and the centering hub at the lower end of the clamp arm, a clearance is formed between the second magnet and the clamp arm. The disk clamp device according to claim (1). (3) The disk clamp device according to claim (1), wherein the first and second magnets are formed in a ring shape in which a plurality of magnetic pieces are connected in an annular shape. (4) Set the arrangement relationship between the clamp arm and the clamper so that when the clamp arm moves upward by an amount corresponding to the clearance with the second magnet, the second magnet is attracted and held on the surface of the arm. The disk clamp device according to claim 2, characterized in that: