JPH0435258U

JPH0435258U -

Info

Publication number: JPH0435258U
Application number: JP7534290U
Authority: JP
Priority date: 1990-07-16
Filing date: 1990-07-16
Publication date: 1992-03-24

Description

[Brief explanation of the drawing]

第１図は本考案のヘツド位置検出装置を適用し
た記録情報の記録再生装置の全体構成説明図、第
２図はアーム駆動部の構成説明図、第３図は本願
出願人の既出願に係るヘツド位置検出装置のエン
コーダユニツトの構成説明図、第４図ａ及びｂは
可動スケールの構成を示す平面図及び一部拡大図
、第５図は可動スケールの構成説明図、第６図ａ
，ｂ及びｃは従来のロータリエンコーダの構成説
明図、可動スリツト部の断面図及び受光素子によ
つて得られる波形図、第７図は従来の発光素子の
位置を高くした場合の状態を示す説明図、第８図
ａ，ｂ及びｃは本考案のロータリエンコーダの構
成説明図、可動スリツト部の断面図及び受光素子
によつて得られる波形図、第９図は本考案を適用
したロータリエンコーダの具体的構成説明図、第
１０図ａ，ｂは従来例の説明図である。２０……デイスク、２１……ヘツド、２４……
デツキ、２５……モータ、２７……アーム、２８
……ピボツト軸、３０……カートリツジ、３３…
…コイル、３５……磁気回路部、３７……支持片
、４０……可動スケール、４２……センサ部、４
５……発光素子保持部材、４６……発光素子、４
７……固定スケール、４８……受光素子、５１ａ
，５１ａ′……マスク、５１ｂ，５１ｂ′……透
光性スリツト、５５ａ……マスク、５５ｂ……透
光性スリツト、１００……反射板。 Fig. 1 is an explanatory diagram of the overall configuration of a recorded information recording/reproducing device to which the head position detection device of the present invention is applied, Fig. 2 is an explanatory diagram of the configuration of an arm drive section, and Fig. 3 is a diagram related to an existing application by the applicant. An explanatory diagram of the configuration of the encoder unit of the head position detection device, Figures 4a and 4b are plan views and partially enlarged views showing the configuration of the movable scale, Figure 5 is an explanatory diagram of the configuration of the movable scale, and Figure 6a
, b and c are explanatory diagrams of the configuration of a conventional rotary encoder, a cross-sectional view of a movable slit portion, and a waveform diagram obtained by a light-receiving element, and Fig. 7 is an explanation showing a state when the position of a conventional light-emitting element is raised. Figures 8a, b, and c are explanatory diagrams of the structure of the rotary encoder of the present invention, a sectional view of the movable slit portion, and a waveform diagram obtained by the light receiving element, and Figure 9 is a diagram of the rotary encoder to which the present invention is applied. Specific configuration explanatory diagrams, FIGS. 10a and 10b, are explanatory diagrams of a conventional example. 20...disk, 21...head, 24...
Deck, 25...Motor, 27...Arm, 28
...Pivot axis, 30...Cartridge, 33...
... Coil, 35 ... Magnetic circuit section, 37 ... Support piece, 40 ... Movable scale, 42 ... Sensor section, 4
5... Light emitting element holding member, 46... Light emitting element, 4
7... Fixed scale, 48... Light receiving element, 51a
, 51a'...mask, 51b, 51b'...transparent slit, 55a...mask, 55b...transparent slit, 100...reflection plate.

Claims

[Scope of Claim for Utility Model Registration] (1) A movable scale protruding from a rotating arm or a linear arm equipped with a head that scans along a data track on a disk as a recording medium, and a movable scale facing the movable scale. It consists of a fixed scale arranged, and a light emitting element and a light receiving element arranged on both sides with the movable scale and the fixed scale in between, and the movable scale and the fixed scale are each placed on the surface of a transparent plate-like body to block light. In the head position detection device having a configuration in which a plurality of transparent slits are formed by forming a transparent mask, a reflecting plate is disposed directly above the movable scale, and the light emitting element is The light emitting element is placed at a position away from directly above the movable scale so as to irradiate light toward the reflective surface of the reflector, and the light from the light emitting element reflected by the reflector is directed toward the movable scale surface. 1. A head position detecting device for a disk device, characterized in that the light is incident at right angles to the light receiving element. (2) The head position detection device in a disk device according to claim 1, wherein a fixed scale, a movable scale, and a light receiving element are arranged in this order directly below the reflector.