JPS6150234A - Signal pickup device - Google Patents

Abstract

PURPOSE:To prevent an electrode end at the bottom of a reproducing stylus from detaching from a signal face of a recording medium even if warp of surface takes place to the recording medium during reproduction by setting the bottom face of the reproducing stylus to a signal face of the recording medium at an ideal state without warp at a prescribed angle from the end of the electrode in the backward direction. CONSTITUTION:The signal pickup device is constituted that the bottom 5 of the reproducing stylus 1 has a prescribed open angle to the signal face position X when no warp of surface exists on the signal face 4 of the recording medium 3 from the end 12 of the face 11 in the backward direction. The angle alpha is decided by formula of alpha>beta=360 deg..x/2.L, where (x) is a displacement from the point X of the signal face 4 to the upward maximum phase shift position and L is a distance from a fulcrum 9 to an electrode forming face 11. Thus, even if warp takes place on the recording medium 3, the electrode side bottom end 12 of the reproducing stylus 1 is always in press contact onto the signal face 4 of the recording medium 3, the output fluctuation of a reproducing signal is reduced remarkably and excellent and stable reproducing state is obtained.

Description

【発明の詳細な説明】 （イ）　産業上の利用分野 本発明は静電容量型の信号肖生装置、例えばＣＥＤ方式
のビデオテ゛イスクプレーヤ等に利用される信号ピンク
アップ装置に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a signal pink-up device used in a capacitance type signal processing device, for example, a CED type video disk player.

仲）従来技術 一端が弾性体で支持されたアームの他端部に電極を具備
した再生針を記録媒体に当接させて情報信号をｎ電容量
の変化として検出する信号ピックアップ装置は公知であ
る。(Middle) Prior Art A signal pickup device is known that detects an information signal as a change in capacitance by bringing a playback needle, which has an arm supported by an elastic body at one end and an electrode at the other end, into contact with a recording medium. .

このような公知例としては例えば特開昭５７−２１０４
６０号公報、特開昭５８−１４３４５１号に開示されて
いる如くダイヤモンド又はサフアイヤからなる電極支持
部材に５ｉ　ｆｆｆ１面を形成し、支持部材の先端を記
録媒体の信号トラックに係合する如き拮接面をもたせた
形状に加工した再生針を案内溝中の信号面に当接する構
成のものを挙げることができる。更に、この従来例を第
５図に従って説明すると、同図（まりにおいて再生針（
１）はアーム（２）と記録媒体（３）の信号面（４）と
のなす角度が所定の角度θ（例えば７°）で当接する状
態に設定される。An example of such a known example is Japanese Patent Application Laid-Open No. 57-2104.
60 and Japanese Patent Laid-Open No. 58-143451, a 5i fff1 surface is formed on an electrode support member made of diamond or sapphire, and the tip of the support member is engaged with a signal track of a recording medium. One example is one in which a regenerated needle processed into a shape with a surface abuts against a signal surface in a guide groove. Furthermore, this conventional example will be explained with reference to FIG. 5.
1) is set such that the angle formed by the arm (2) and the signal surface (4) of the recording medium (3) abuts at a predetermined angle θ (for example, 7°).

その際、信号面（４）と走査針（１）の底面（５，は信
号面（４）と平行に保たれるような関係になっている。At this time, the signal surface (4) and the bottom surface (5,) of the scanning needle (1) are in a relationship such that they are kept parallel to the signal surface (4).

尚、前記再生針（１）はホルダ（支持体）（６）によっ
て上方部が保持されている。ホルダ（６）はアーム（２
）に連結し、アーム（２）の他端は弾性体（７）を介し
て基台（８）に固定されている。そしてアーム（２）は
弾性体（７）内に位置する支点（９）を中心に回動自在
となっている。Incidentally, the upper part of the regenerated needle (1) is held by a holder (support body) (6). The holder (6) is attached to the arm (2
), and the other end of the arm (2) is fixed to a base (8) via an elastic body (7). The arm (2) is rotatable about a fulcrum (9) located within the elastic body (7).

尚、再生針（１）のＷｉＱＯｌには信号取出し用として
弾性状の出力リードが接続されているが、図では省略し
ている（後述する第１図においても同様）。Note that an elastic output lead is connected to the WiQOl of the reproduction needle (1) for signal extraction, but it is omitted in the figure (the same applies to FIG. 1, which will be described later).

（Ｌ）は支点（９）から再生針の電極形成面αυまでの
長さを表わす。ところで、再生中に回転する記録媒体（
ディスク）は製造工程で生じる反りやターンテーブル装
着時の機械的公差など回避できない要因によってピーク
・ツウ・ピーク値で１ｃ２ｊｆｆ程度の面振れが発生す
る。第５図（ａ）において面振れがない理想的な状態の
ときの記録媒体の信号面（４）を勾とした場合に、アー
ム（２）の傾斜角がθで、且つ再生針の底面（５）が信
号面（４）に平行で当接するように設定する（実線の状
態）と、記録媒体（３）の面振れによって信号面（４）
は＜Ｘ＞を中心に上下に振れるから、信号面が上方に変
移して（Ｙ）の位置にあるときには第５図（ａ）の点線
で示す如くなる。(L) represents the length from the fulcrum (9) to the electrode forming surface αυ of the regenerated needle. By the way, the recording medium that rotates during playback (
A surface runout of about 1c2jff (peak-to-peak value) occurs in disks due to unavoidable factors such as warping that occurs during the manufacturing process and mechanical tolerances when mounting the turntable. In FIG. 5(a), if the signal surface (4) of the recording medium in an ideal state with no surface runout is the slope, the angle of inclination of the arm (2) is θ, and the bottom surface of the playback needle ( 5) is set so that it is parallel to and in contact with the signal surface (4) (solid line state), the signal surface (4) is caused by the surface runout of the recording medium (3).
can swing up and down with <X> as the center, so when the signal plane moves upward and is at the position (Y), it becomes as shown by the dotted line in FIG. 5(a).

この状態では第５図（ｂ）に拡大して示すようにアーム
（２）は支点（９）を中心として時計方向に回転し、再
生針の底面（５）は信号面（４）と角度βで対向するこ
とにな夛、１（１゛僚仰１の端部０２が信号面（４）に
対しスｊｆｌＯする状態になろうこのとき、底面（５）
は後方側の端部ＯＪで信号向（４）と接する。一方、信
号面（４）が（Ｘ）よりも下に変移〔第５図（Ｃ）に示
す（Ｚ）まで〕して第５図（Ｃ）の点線で示す状態にな
ったときは、底面（５）は信号面（４）に対し、第５　
Ｍ　（ｈ）の場合とは逆方向に傾余Ｆする。このときの
傾余Ｆ角δはδ＝２βとなるが、電極側の端部じは信号
面（４）に当接する状態となっているので再生動作に問
題はない。しかし、上述のように信号面（４）の面振れ
に伴なって電極側の端部Ｑ２１と信号面（４）との距離
が変動すると本来一定振幅（Ｖ／２　＞であるべき再生
出力が第６図（１）の如く変動（ΔＶ）することになる
。In this state, as shown in an enlarged view in FIG. 5(b), the arm (2) rotates clockwise around the fulcrum (9), and the bottom surface (5) of the regeneration hand is at an angle β with the signal surface (4). Now that they are facing each other, the end 02 of 1 (1) will be in a state where it is in contact with the signal surface (4).At this time, the bottom surface (5)
contacts the signal direction (4) at the rear end OJ. On the other hand, when the signal plane (4) shifts below (X) [up to (Z) shown in Figure 5 (C)] and reaches the state shown by the dotted line in Figure 5 (C), the bottom surface (5) is the fifth
The inclination is F in the opposite direction to the case of M (h). At this time, the inclination F angle δ becomes δ=2β, but since the end portion on the electrode side is in contact with the signal surface (4), there is no problem in the reproducing operation. However, as mentioned above, if the distance between the electrode side end Q21 and the signal surface (4) changes due to the surface runout of the signal surface (4), the reproduction output, which should originally have a constant amplitude (V/2 > It will fluctuate (ΔV) as shown in FIG. 6(1).

これはＳ／Ｎ比の変動を招いて安定な再生信号の検知を
困難にする。特に電極が信号面から離間したときは短波
長域での検知能力が面端に低下しＭ゛像度低下するのを
避は得ない。また、而振れに従って再生針の底面が、そ
の電極側の端部■と、後方側の端部側とで交互に信号面
に当接することは記録媒体の信号面に損傷を与えること
を意味する。This causes fluctuations in the S/N ratio, making it difficult to detect a stable reproduced signal. In particular, when the electrode is separated from the signal surface, the detection ability in the short wavelength range decreases toward the edge of the surface, and it is inevitable that the M image quality will decrease. In addition, due to the vibration, the bottom surface of the reproducing stylus contacts the signal surface alternately at the electrode end (■) and the rear end, which means damage to the signal surface of the recording medium. .

（ハ）考案が解決しようとする問題点 それ故に、本発明は再生針の底面の電極側端部が記録媒
体の信号向に対し信号面の振れに伴なって離間したり、
距離を変動したりするという問題を解決する。(c) Problems to be Solved by the Invention Therefore, the present invention solves the problem that the electrode side end of the bottom surface of the reproducing needle may become separated due to the deflection of the signal surface with respect to the signal direction of the recording medium.
To solve the problem of changing distance.

に）問題点を解決するための手段 プレーヤに対し再生状態となる如く設定したとき面振れ
等のない理想的な状態のときの記録媒体の信号面に対し
前記再生針の底面が前記電極側の端部から後方に向って
所定角度で開く如＜Ｌｆｃ構成。(b) Means for solving the problem When the player is set to be in the playback state, the bottom surface of the playback needle is on the electrode side with respect to the signal surface of the recording medium in an ideal state with no surface wobbling etc. Lfc configuration that opens at a predetermined angle from the end toward the rear.

（ホ）作用 再生中に記録媒体に面振れが生じて、信号面が上方に変
移し再生針の底面が時計方向に回動して、その前端部が
信号面から離れようとする力が働いても、予め底面を前
端部から後方側端部に向けて信号面に対し所定の角度で
開くように設定している大め、前端部が信号面から離れ
ない。信号面が下方に′ＩＪ：移して再生針の底面が反
時計方向に回動したときも、前端部は信号面に当接した
ままの状態となる。(E) Effect During playback, surface deflection occurs in the recording medium, the signal surface shifts upward, the bottom surface of the playback needle rotates clockwise, and a force acts that causes the front end of the needle to move away from the signal surface. However, the bottom surface is set in advance to open at a predetermined angle to the signal surface from the front end toward the rear end, so the front end does not move away from the signal surface. Even when the signal surface moves downward and the bottom surface of the reproduction needle rotates counterclockwise, the front end remains in contact with the signal surface.

に）実施例 第１図は本発明の実施例を示し、第５図と同一部分には
同一の符号を付している。本発明の信号ピックアップ装
置は記録媒体（３）の信号面（４）に振れがないときの
信号面位置（Ｘ）に対し、再生針（１）の底面（５）を
車枠００が形成されている面（１１）側の端部りから後
方側に向けて所定の角度αで開くよう１こ構成している
。この角度αが第５図のβよりも大きく形成されるべき
ことは理解されるべきである。B) Embodiment FIG. 1 shows an embodiment of the present invention, and the same parts as in FIG. 5 are given the same reference numerals. The signal pickup device of the present invention is arranged so that the car frame 00 is formed so that the bottom surface (5) of the reproduction needle (1) is located at the signal surface position (X) when there is no vibration on the signal surface (4) of the recording medium (3). It is configured so that it opens at a predetermined angle α from the end on the surface (11) side toward the rear side. It should be understood that this angle α should be made larger than β in FIG.

そこで、Ｉを具体的に求めてみる。今、（Ｘ）から上方
への最大径相位１ｄ（Ｙ）までの変位置をＸとすると、 β＝３６００Ｘ／２ＫＬ となる。ここで、Ｌはトフッキング特性、振動系の質量
、アーム不要共振等を考慮して定められ６０〜８０朋の
範囲で適用可能であるから、Ｘが１朋とすると、Ｌが３
０顛であればβ＝１．９°となシ、Ｌが５５１ａｌでは
β＝１°、Ｌが８０ｍｌテはβ＝０．８゜となる。この
βの値を考慮してαはα〉βの条件を満すように定める
。Therefore, let's try to find I specifically. Now, if the displacement position from (X) upward to the maximum diameter phase 1d (Y) is defined as X, then β=3600X/2KL. Here, L is determined taking into consideration the hooking characteristics, the mass of the vibration system, arm-free resonance, etc., and is applicable in the range of 60 to 80, so if X is 1, then L is 3.
If the size is 0, β = 1.9°, if L is 551 al, β = 1°, and if L is 80 ml, β = 0.8°. Considering the value of β, α is determined so as to satisfy the condition α>β.

第２図は第１図のような構成の信号ピックアップ装置を
作成する方法を示している。加工法については特開昭５
７−２１０４６０号や特開昭５８−１４３４５１号公報
に記載されているので、その詳細は省略する。第２図に
おいて、研磨体α優の研磨面０９に対して再生針（１）
が組み込まれた状態を示しているが、第１の方法として
はアーム（２ｊの対接角度をθ−α（αはＬに依存する
）に設定して底面（５）を相対的速度で研磨体の研磨面
間に圧接する方法である。当然のことながら、アーム（
２）は弾性体（７）の支点（９）を中心として回動する
。例えばＬ＝８０１１Ｉｌ、θ＝７°とすれば研磨角度
（アームと研磨面とのなす角度）θ−αは６．２°とな
る。第２の１　　　カ、おＬ□よ。４ｏあ、工７．ヶ、
１５、再生針先端に対して角度αをもたせるように研磨
体表面を点線（ＩＧ＋で示す如く傾斜させて当接する方
法である。このようにして、所定角度αを設定できる。FIG. 2 shows a method for producing a signal pickup device having the configuration shown in FIG. Regarding the processing method, see JP-A-5
Since it is described in No. 7-210460 and Japanese Unexamined Patent Publication No. 58-143451, the details thereof will be omitted. In Fig. 2, the regenerating needle (1) is placed against the polishing surface 09 of the polishing body α-yu.
The first method is to set the contact angle of the arm (2j) to θ - α (α depends on L) and polish the bottom surface (5) at a relative speed. This is a method of pressing between the polished surfaces of the body.Of course, the arm (
2) rotates around the fulcrum (9) of the elastic body (7). For example, if L=8011Il and θ=7°, the polishing angle (the angle between the arm and the polishing surface) θ−α will be 6.2°. Second one, you L□. 4o ah, engineering 7. ga,
15. This is a method in which the surface of the polishing body is tilted and brought into contact with the tip of the regenerating needle at an angle α as shown by the dotted line (IG+). In this way, the predetermined angle α can be set.

尚、前記αを必要以上大きく設定、例えばＬ＝３０朋、
θ＝７°のときα〉２°とすることも可能であるが、そ
のようにすると底面（５）と信号面（４）がよりシャー
プな角度で接することになシ、信号面（４）の損傷や再
生針先端部の摩耗を促進するという不都合が生じるので
、αを必要以上に大きくすることは避けるべきである。Note that α is set larger than necessary, for example, L=30,
It is also possible to set α>2° when θ=7°, but in that case, the bottom surface (5) and the signal surface (4) would contact each other at a sharper angle, and the signal surface (4) It should be avoided to make α larger than necessary, since this may cause damage to the regenerated needle and promote wear of the tip of the regenerated needle.

第６図及び第４図は！部幅が摩耗方向に一定となるよう
側面（１７ａ）（１７１１）を切欠いた再生針（１）に
本発明を適用した場合の実施例を示している。Figures 6 and 4 are! An example is shown in which the present invention is applied to a recycled needle (1) in which the side surfaces (17a) (1711) are notched so that the width of the part is constant in the direction of wear.

（ト）発明の効果 本発明によれば記録媒体に面振れが生じても常に再生針
の電極側底面端部が記録媒体の信号面に当接するので、
再生信号の出力ｆ！！［４６図（１）の如く著しく減少
でき良好且つ安定な再生状態が得られるという効果があ
る。(G) Effects of the Invention According to the present invention, even if surface runout occurs in the recording medium, the bottom end of the reproducing needle on the electrode side always comes into contact with the signal surface of the recording medium.
Output of playback signal f! ! [As shown in Figure 46 (1), this has the effect of significantly reducing the amount of energy and providing a good and stable reproduction state.

【図面の簡単な説明】 第１図は本発明を実施した信号ピックアップ装置の概要
を示す模式図であシ、第２図はその製造を説明する図で
ある。第６図及び第４図は本発明の他の実施例について
の要部拡大図である。第５図は従来例を示す図である。 第６図は本発明による効果を従来例と対比して示す特性
図である。 （１）・・・・・・再生針、（２）・・・・・・アーム
、（３）・・・・・・記録媒体、（４）・・・・・・信
号面、（５）・・・・・・底面、（６）・・・・・・ホ
ルダ（支持体）、（７）・・・・・・弾性体、■・・・
・・・′ｒＬ極側の端部、（に）・・・・・・所定角度
。 出駄三洋電機株式会社BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing an overview of a signal pickup device embodying the present invention, and FIG. 2 is a diagram explaining its manufacture. FIGS. 6 and 4 are enlarged views of main parts of other embodiments of the present invention. FIG. 5 is a diagram showing a conventional example. FIG. 6 is a characteristic diagram showing the effects of the present invention in comparison with the conventional example. (1)...Reproduction needle, (2)...Arm, (3)...Recording medium, (4)...Signal surface, (5) ... Bottom surface, (6) ... Holder (support), (7) ... Elastic body, ■ ...
...'rL pole side end, (to) ...predetermined angle. Deda Sanyo Electric Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] （１）情報信号を記録した記録媒体の信号トラックに沿
って摺接する底面及び該底面に対し垂直方向に延び且つ
電極を具備する面を有する再生針と、前記電極に接続し
た弾性状の出力リードと、前記再生針を支持する支持体
と、該支持体に連なるアームと、該アームの基部を基台
に弾性的に支持する弾性体とを備える信号ピックアップ
装置において、プレーヤに対し再生状態となる如く設定
したとき面振れのない理想的な状態のときの記録媒体の
信号面に対し前記再生針の底面が前記電極側の端部から
後方に向って所定角度で開く如く構成してなる信号ピッ
クアップ装置。(1) A reproducing needle having a bottom surface that slides along the signal track of a recording medium on which an information signal is recorded and a surface extending perpendicularly to the bottom surface and having an electrode, and an elastic output lead connected to the electrode. and a signal pickup device comprising a support body that supports the playback needle, an arm connected to the support body, and an elastic body that elastically supports the base of the arm on a base, which is brought into a playback state for the player. a signal pickup configured such that the bottom surface of the reproducing needle opens at a predetermined angle rearward from the end on the electrode side with respect to the signal surface of the recording medium in an ideal state with no surface wobbling when set as shown in FIG. Device.