JPS58158059A - Scanning stylus - Google Patents

Abstract

PURPOSE:To reduce the cost of work for forming a starting material into a specific shape by obtaining a scan-out surface having desired electrode width in the process of forming a projecting part under a stylus base. CONSTITUTION:The projecting part 20 projects further downward from the reverse surface 41 of the stylus base 40 and has a bottom surface 21 slidably in contact with a video disk and the 1st and the 2nd flanks 24 and 25 which extend respectively while the 1st immaginary surface 50 running through the bottom surface 21 and crossing the scanning stylus longitudinally is interposed and also have lower edges 22 and 23 formed by the bottom surface 21. Further, this projection 201 has the 3rd and the 4th flanks 28 and 29 which extend respectively while the 2nd immaginary surface 52 crossing the 1st immaginary surface 50 and crossing the scanning stylus longitudinally through the bottom surface 21 is interposed and are formed by lower edges 26 and 27 and bottom surface 21, and the 5th flank 31 having a ridge edge 30 which is placed between the 1st and the 3rd flanks 24 and 28, forms the bottom surface 21 and is specified in length within the width of a signal track.

Description

【発明の詳細な説明】 本発明は静電容敏式ビデオディスクプレーヤ等（適用さ
れる走査針に関するものであり、加工性の向上ひ−では
製品の低廉化を図ることを目的とするものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a scanning needle applied to electrostatic-sensitive video disc players, etc., and aims to improve processability and reduce the cost of the product. .

ある檀の、例えばＶＨＤ方式と称するビデオディスクグ
ν−ヤでは第１０図に示す如き構成の走査針が提案され
ている。これは、ダイヤモンドチップ（ｌｊを先端に埋
め込んだチタンシャンク（２）の下部をチップともども
円錐状に加工したものを出発材料として、信号の走入側
に稜線（３）な持つように第１、第２背面１４Ｊ　（５
）な形成し、また電極形成面（６）の横巾（７）を所定
値以内に収めるように第１、第２側面（８１（９）を形
成し、さらにビデオディスクの信号トラックに摺接Ｔる
底面間を形成して構成されるものである。ところで、こ
の構成ＩＣおいては、数千時開の寿命を保証Ｔる九めに
＃Ｔる電極の長さは高々数μｍ乃至１０声清程度である
ところ、この長さにわた９て所定の電極巾を形成するた
めに約１００倍径度（１園以上）の長さの範囲で加工を
して上記第１、第２園面ζ８）（９７を成形しなければ
なら々−からま九被加工材は高い耐摩耗性を有している
から著しく加工性が悪く従い低コスト化のための隘路と
なりていた。加工速度を上げるため上記各加工面を粗加
工してその後先端部の各側面を微加工Ｔることは加工回
数が増加することとなり好ましくない。A certain company has proposed a scanning needle having a configuration as shown in FIG. 10 for a video disk player called, for example, the VHD system. The starting material is a titanium shank (2) with a diamond tip (lj embedded in the tip) whose lower part is shaped into a conical shape. Second back 14J (5
), and the first and second side surfaces (81 (9) are formed so that the width (7) of the electrode forming surface (6) is within a predetermined value, and the electrodes are slidably connected to the signal track of the video disc. By the way, in this configuration IC, the length of the #T electrode is at most several μm to 10 However, in order to form a predetermined electrode width over this length, processing is performed within a length range of about 100 times the diameter (more than 1 inch) and then the first and second lines are processed. Surface ζ8) (97 must be formed - Karama 9 Work material has high wear resistance, so it has extremely poor workability and has become a bottleneck for cost reduction. It is not preferable to perform rough machining on each of the machined surfaces and then finely machine each side surface of the tip in order to increase the number of machining operations.

本発明はこの点ｖｃＩｉｌｌｌ意してなされ九ものでＴ
ｏシ、電極中の規制を極めて少ない加工電で達成できる
構成の走査針を提供しようとするものである。The present invention has been made with this point in mind.
Another object of the present invention is to provide a scanning needle configured to achieve regulation in electrodes with extremely little processing power.

本発明は記録媒体（以下ビデオディスクという）ＶＣ摺
接する底面を有する突起部とこの突起部を一体に具備す
る針基台を有する走査針において、この突起部は、底面
を通りかつ走査針を縦断する第１仮想面を挾んでそれぞ
れ延在し下縁がこの底面によりて画成される第１、第２
側面と、第１仮想面に交差する仮想面で、ヒ妃底面を通
にかつ走査針を縦断する第２仮想面を挾んでそれぞれ延
在し下縁がこの底面によって画成される第５、第４＠面
と、第１、第５側面に挾まれかつ上記底面を画成する稜
線の長さが信号トラックの巾以内に規制されている第５
１１１１面を有する構成とし、４１９て電極中を規制す
る九めの加工をこの突起部に隣接するａ滅に限定し、加
工性の良い走査針を提供しようとＴるものである。The present invention relates to a scanning needle having a protrusion having a bottom surface in sliding contact with a recording medium (hereinafter referred to as a video disk) and a needle base integrally equipped with this protrusion, in which the protrusion passes through the bottom surface and extends longitudinally through the scanning needle. first and second imaginary planes extending across the first imaginary plane, the lower edges of which are defined by the bottom surface;
and a fifth imaginary plane that intersects with the first imaginary plane and extends across the second imaginary plane that passes through the bottom surface and across the scanning needle, the lower edge of which is defined by the bottom surface; A fifth @ surface, which is sandwiched between the first and fifth side surfaces and whose length is regulated within the width of the signal track and which defines the bottom surface.
It is intended to provide a scanning needle with good workability by having a structure having 1111 planes, and by limiting the machining of the ninth part 419, which regulates the inside of the electrode, to the part adjacent to this protrusion.

次に本発明の走査針の１実施例を図面を＃照して説明す
る。Ｗ、１図は本実施例の概略構成図な示し、（転）は
正面図、Φ）は側面図である。第２図は第１図の１−１
部分を拡大して示すもので、−）は斜視図、Φ）は正面
図、（Ｃ）は側面図、ｃｉ）は底面図である・ 走査針０は下部に錐状部（ＳＡ）を持つ柱状に形成され
ていてその中心ＩａａＴＪｖＣ対して角度←）（例えば
−一５°）ｔ−有する平面αりを有する本体−と、この
本体の平面σり上に付着してなる電極層α３とを備えて
いる。この走査針０はその先端５（８Ｂ）をダイヤモン
ドで構成し残りの部分を金１４（例えばチタン）製とし
ている。この走査針はビデオディスクの信号トラック上
に電極層（１３が信号トラックの走出側に位置するよう
にかつ所定のコンプライアンスを持つように記され、両
者の相対摺動運動を通じて信号トラック上の幾何学的形
状変化に応する静電容Ｉｌ饋の変化’）［′ｇ！ｃ信号
の変化として検出するようにしている。破４１［４は平
面へ３形成時に除去される素材部分である。Next, one embodiment of the scanning needle of the present invention will be described with reference to the drawings. Figure 1 is a schematic configuration diagram of this embodiment, (roll) is a front view, and (Φ) is a side view. Figure 2 is 1-1 in Figure 1.
-) is a perspective view, Φ) is a front view, (C) is a side view, and ci) is a bottom view - Scanning needle 0 has a conical part (SA) at the bottom. A main body formed in a columnar shape and having a plane α with an angle ←) (for example -15°) t with respect to the center IaaTJvC, and an electrode layer α3 attached on the plane σ of this main body. We are prepared. The tip 5 (8B) of the scanning needle 0 is made of diamond, and the remaining part is made of gold 14 (for example, titanium). This scanning needle is marked on the signal track of the video disk so that the electrode layer (13) is located on the running side of the signal track and has a predetermined compliance, and through the relative sliding movement of the two, the electrode layer (13) is placed on the signal track. Change in capacitance Il in response to a change in the shape of the object') ['g! This is detected as a change in the c signal. Fracture 41 [4 is the material portion that is removed when forming 3 into a flat surface.

この走査針０はその先端１（第１図の１−１部分）を第
２図の拡大図で示すように成形してビデオディスクの信
号トラックに適合するようにしている。この先端！Ｉｓ
Ｔなわち走査針０は、最先端に位置してビデオディスク
に摺接する底面を有Ｔる突起Ｓ■と、この突起部を一体
に具備する針墓台咽とを備えている。この針基白菊及び
突起１ＩＫＱｉＪの上記平面［１３上の部分には上記電
極ＩＱ３が２０００〜！１ｏｏＯＡ程度の厚さで形成さ
れているが、以Ｆの図ではこの電極層を八ツチングでも
りて表示する。The tip 1 (portion 1-1 in FIG. 1) of the scanning needle 0 is shaped as shown in the enlarged view of FIG. 2 to fit the signal track of the video disc. This tip! Is
T, that is, the scanning needle 0 is provided with a protrusion S<b>2 located at the leading edge and having a bottom surface that slides into contact with the video disk, and a needle base throat that is integrally provided with this protrusion. On the part above the plane [13] of this needle base white chrysanthemum and the protrusion 1IKQiJ, the electrode IQ3 is 2000~! Although it is formed with a thickness of about 100 OA, this electrode layer is shown by eight-cutting in the following figures.

突起部■は針基台（４（ｌの下面（４１）からさらに下
方に突出するものであり、図示の如く、ビデオディスク
に摺接する底面Ｃυと、該底面＜２１）を通りかつ走査
針を縦断する第１仮想面一を挾んでそれぞれ延在し下縁
１２３（至）が底面シυで画成される第１、第２ｔｌ１
面ｅ１４１（ハ）と、第１仮想面（至）に交差（例えば
直交）しさらに底面（２υを通りかつ走査針を縦断する
第２仮想面輪を挾んでそれぞれ地在し各下縁＠額が底面
■υによりて＠成されるｇ！！Ｊ５、第４側面（至）翰
と、上記第１、第５１１１面＠（至）に挾まれかつ底面
（２υを画成する稜線（至）の長さが上記信号トラック
の巾以内に規制されている第５１１面（１ｍとを備えて
いる。The protrusion ■ protrudes further downward from the lower surface (41) of the needle base (4(l), and as shown in the figure, passes through the bottom surface Cυ that slides into contact with the video disc and the bottom surface <21) and guides the scanning needle. The first and second tl1 extend across the first virtual plane that traverses the length, and have a lower edge 123 (toward) defined by the bottom surface υ.
The plane e141 (c) intersects (for example, perpendicularly intersects) the first virtual plane (to) and further lies between the second virtual plane ring that passes through the bottom plane (2υ and traverses the scanning needle), and each lower edge @ forehead is formed by the bottom surface ■υ!! A 511th surface (1 m) is provided, the length of which is regulated within the width of the signal track.

かかる突起部の成形手順を以下筒！＄ＦＩＪｒｃ従い説
明する・第１図に示すように成形されえ針素材（ただし
、先ｍｓは末成形）を出発材ｖＪ＃σ０として、これを
径方向の断面がＶ字状の研磨溝輪を有する研磨ディクス
旬に対して中心線ａυが直交するようにそして平面１１
邊の、研磨溝輪の延在方向−に対して採る角度がβ（５
５〜５５°の範囲、例えばβ−４５＠）となるように配
して（第４図参照）両者を相対運動させることによシ、
出発材料な研磨溝輪及び該研磨溝に隣接するランド部關
上の砥粒層−によりてこれらの形状に倣う形状に研削、
加工し、第５図（ａ）＠に示す如く第１仮想面軸を挾ん
で相互に対称となる部分を含む第１、第２１１ｉｉ１ｉ
ｃ２４１（ハ）及び針１台−の正面図の一部分を成形Ｔ
る０次いでこの中間品を上記研磨ディスクおυに対して
、平面ｌが研磨溝の延在方向−に対して採る角度がπ β＋−となるように配してこの研磨溝鋳及びランドｓ＆
１に倣う形状に研削、加工して第１仮想面団に対して直
交する！２仮想面５３を挾んで相互に対称々第３．第４
＠面漫の並びに針基台船下面の残りの部分を成形する。The steps for forming such protrusions are as follows! As shown in Figure 1, the needle material that has been formed (however, the tip ms is unformed) is used as the starting material vJ#σ0, and this is used to form a polishing groove ring with a V-shaped cross section in the radial direction. The center line aυ is orthogonal to the polishing disk having a plane 11.
The angle taken with respect to the extending direction of the polishing groove ring is β (5
By arranging them so that they are in the range of 5 to 55 degrees (for example, β-45@) (see Figure 4) and moving them relative to each other,
Grinding into a shape that follows these shapes using the starting material polishing groove ring and the abrasive grain layer on the land portion adjacent to the polishing groove,
The first and second 211ii1i are processed to include mutually symmetrical parts sandwiching the first virtual surface axis as shown in FIG. 5(a) @.
Part of the front view of c241 (c) and one needle is molded T
Next, this intermediate product is placed with respect to the polishing disk υ so that the angle of the plane l with respect to the extending direction of the polishing grooves is π β+−, and the polishing groove casting and land s&
Grind and process it into a shape that follows 1 and is perpendicular to the first virtual surface group! 2 virtual planes 53 in between and symmetrical to each other. Fourth
＠Mold the remaining parts of the men's mantle and the lower surface of the needle base ship.

この２回の研削工程で、第１、第５１１面Ｉ２４！困の
成形と同時に、これら各側面に隣接Ｔる第５ｆＩＩＩ面
Ｇυの巾を規制する６次いで、この第２次中間品をその
中心線が平坦な研磨面を有する研磨板に直交するように
圧接させ所定の底面（２υが現われるまで研磨をして、
第２図に示すような形状の先端部な有Ｔる走査針を完成
する。第５図は他の加工手順による第１次申開品を示す
ものである。これは、第１、第２ｍ面（２）２！９を成
形する第１次加工及び第５、第４１ｉ１面＠翰を成形す
る第２次加工時に同時に底面シυを成形するようにして
、底面Ｇｌ）成形のための第３次加工を省略するように
したものである。これには、研磨ディスクの研磨溝を第
４図の破線−で示すように断面逆台形状に丁れけ良い。In these two grinding steps, the first and 511th surfaces I24! At the same time as forming the second intermediate product, the width of the 5fIII surface Gυ adjacent to each of these sides is regulated. Next, this second intermediate product is pressed so that its center line is perpendicular to a polishing plate having a flat polishing surface. Polish it until the specified bottom surface (2υ) appears,
A scanning needle with a tip having a shape as shown in FIG. 2 is completed. FIG. 5 shows the first developed product using another processing procedure. This is done by simultaneously forming the bottom surface υ during the first processing to form the first and second m surfaces (2) 2!9 and the second processing to form the fifth and 41i1 surfaces @Kan. The tertiary processing for forming the bottom surface Gl) is omitted. For this purpose, the polishing grooves of the polishing disk can be sharpened into an inverted trapezoidal cross section as shown by the broken line - in FIG.

第６図は本発明の他の実施例を示すものである。FIG. 6 shows another embodiment of the invention.

これは針基材を６角錐形状とＴると共に研磨溝の径方向
断面形状な略Ｕ字状にしたものである０本実施例では、
上記実施例とは異なり、＠１、第２側面ａ４ｔｙｄ及び
第３、第４−一はそれぞれ第１、第２仮想面−ａ６ｒｃ
対して略平行に形成され、第！＄６１１面Ｇ６上の電極
巾が突起部−の摩耗の進行に伴な１殆んど変化しないよ
うにしている。針基台噛の下面Ｉも当然のことながら３
角形状に成形されている。圓は突起部■の底面であ抄、
酸４１佇υは研削加工前の先端部の形状を示すものであ
る。この形状の走査針は、針基材を先の実施例と同様に
、研磨溝の延在方向−に対して電極を有Ｔる平面（ｌり
を傾斜させて研磨溝に対接することによって形成される
。第７図は、１次加工后の中間品を示している。In this embodiment, the needle base material has a hexagonal pyramid shape and the polishing groove has a radial cross-sectional shape of approximately U shape.
Unlike the above embodiment, @1, the second side surface a4tyd, and the third and fourth-1 are the first and second virtual surfaces -a6rc, respectively.
It is formed almost parallel to the ! The width of the electrode on the $611 plane G6 is kept almost unchanged as the protrusion wear progresses. Of course, the lower surface I of the needle base is also 3.
It is formed into a square shape. The circle is cut at the bottom of the protrusion ■,
Acid 41 υ indicates the shape of the tip before grinding. The scanning needle of this shape is formed by making the needle base material a plane (T) having electrodes with respect to the extending direction of the polishing grooves by tilting the needle base material to be in contact with the polishing grooves, as in the previous embodiment. Figure 7 shows an intermediate product after primary processing.

基台（社）の下面Ｃυは研磨ディスクのランド部で成形
され、底面Ｑυは溝底面にようて形成され、さらに第１
、第２−面ｃ！４１（２Ｓは溝側壁によりて形成される
ものである。矢印旬は上記延在方向を示し、矢印−は２
次加工のための研磨溝の延在方向を示している。第８図
は本発明の釦に他の実施例における中間品（１次加工済
みのもの）を示す斜視図であり、第９図はこの加工に供
する研磨ディスクの部分断面図である。この実施例は、
走査針の電極中を規定Ｔる伽域鑓の更に上方の針基台（
社）に斜面（６）を形成するようにしたものである。こ
れは、研磨ディスク翰上の研磨溝（８１）の開口を（８
２）から（８３）に拡げることができるので、針素材を
研磨溝内にアクセスさせる九めｖｃ該針素材の尖鋭度を
厳格にする必要がないのでその九めの選別或いは加工を
必要とせず作業性を更に改１１Ｔることができる。The lower surface Cυ of the base is formed by the land part of the polishing disk, the bottom surface Qυ is formed along the bottom surface of the groove, and the first
, second side c! 41 (2S is formed by the groove side wall. The arrow mark indicates the above extension direction, and the arrow - indicates 2
It shows the extending direction of the polishing groove for the next processing. FIG. 8 is a perspective view showing an intermediate product (one that has undergone primary processing) in another embodiment of the button of the present invention, and FIG. 9 is a partial sectional view of an abrasive disk used for this processing. This example is
The needle base (
A slope (6) is formed on the slope (6). This opens the abrasive groove (81) on the abrasive disk (8
Since it can be expanded from 2) to (83), there is no need to strictly set the sharpness of the needle material to access the polishing groove, so there is no need for the selection or processing of the needle material. Workability can be further improved by 11T.

以上説明し友ように本発明の走査針は針基台の下方に突
起部を設けこの突起部を成形Ｔる過程で所望の電極巾を
有Ｔる走出面を得るように構成しているので出発材料か
ら所定形状に成形するための加工量及び加工回数を少な
くすることができもりて走査針の加工費を低減させるこ
とができる。As explained above, the scanning needle of the present invention is configured such that a protrusion is provided below the needle base and a running surface having a desired electrode width is obtained in the process of forming this protrusion. It is possible to reduce the amount of processing and the number of processing operations required to mold the starting material into a predetermined shape, thereby reducing the processing cost of the scanning needle.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の走査針の外観略図であり、似）は正面
図、（至）は四面図で売る。第２図は第１図の１−１部
分を拡大して示Ｔもので、％）は斜視図。 （ロ）は正面図、幹）は側面図、ゆは底面図である。第
る。第４図はこの加工中間品を形成するための説明図で
、（転）は研磨ディスクの径方向断面図と針素材の何面
図、口）は琳磨ディスク側から見九針素材る。第６図は
本発明の他の実施例の先端部を示し、執）は斜視図、（
ロ）は正面図、仲）は底面図である。第７図は第６図の
実施例の１次加工后の中間品を示し、■は正面図、（ロ
）は底面図である。第６図は本発明の１１！に他の実施
例における１次加工済み中間品の正面図である。第９図
はこの中間品ｆ：影形成るための研磨ディスクの径方向
断面図でめる。第１０図は従来の走査針を示し、（２）
）は正面図、Φ）は何面図、幹）は背面図、向は針先部
分の拡大正面図である。 主な図番の説明 咽・−針１台、■・・・突起ｓ、（ｉｌｌ−底面、Ｑ４
Ｉ２５１＠＠・・・第１、第２、第５、第４１１面、ｆ
ｆ４６り・−第１、第２仮想面。 第３図 第４図 第１図 第８図　　　　　　　　　　第９図 第ｐ図FIG. 1 is a schematic diagram of the appearance of the scanning needle of the present invention, with the figure shown in FIG. 1 being a front view and the figure shown in FIG. FIG. 2 is an enlarged view of the section 1-1 in FIG. 1, and %) is a perspective view. (b) is a front view, trunk) is a side view, and yu is a bottom view. First. FIG. 4 is an explanatory diagram for forming this processed intermediate product, where (roll) is a radial cross-sectional view of the abrasive disk and a cross-sectional view of the needle material, and (opening) is the nine-needle material seen from the polishing disk side. FIG. 6 shows the tip of another embodiment of the present invention;
B) is a front view, middle) is a bottom view. FIG. 7 shows an intermediate product after primary processing of the embodiment shown in FIG. 6, where ■ is a front view and (b) is a bottom view. Figure 6 shows 11 of the present invention! FIG. 6 is a front view of a primary processed intermediate product in another example. FIG. 9 is a radial cross-sectional view of this intermediate product f: an abrasive disk for forming shadows. Figure 10 shows a conventional scanning needle, (2)
) is a front view, Φ) is a side view, stem) is a back view, and direction is an enlarged front view of the needle tip. Explanation of main drawing numbers Throat - 1 needle, ■... protrusion s, (ill - bottom, Q4
I251@@...1st, 2nd, 5th, 411th page, f
f46ri--first and second virtual planes. Figure 3 Figure 4 Figure 1 Figure 8 Figure 9 Figure p

Claims (1)

【特許請求の範囲】[Claims] ｔ　記録媒体の信号トラックに摺接して該信号トラック
上の情報を静電容量値の変化に応する電気信号の変化と
して検知再生する、前記記録媒体に摺接する底面を有す
る突起部とこの突起部を一体に具備する針基台とを備え
る走査針において、前記突起部は前記底面を通りかつ走
査針を縦断する第１仮想面を挾んでそれぞれ延在し下縁
が前記底面によりてＷ成場れる第１、第２−面と、前記
第１仮想面に交差しさらに前記底面を通りかつ走査針、
を縦断する第２仮想面を挾んでそれぞれ延在し下縁が前
記底面によって画成される第５、第４側面と、前記第１
及び第３側面に挾まれかつ前記底面を画成する稜線の長
さが前記ｌ１号トラックの巾以内に規制されている第５
ｔａ１１面とを備えていることを特徴とする走査針。t. A protrusion having a bottom surface that comes into sliding contact with the recording medium and which detects and reproduces information on the signal track as a change in an electric signal corresponding to a change in capacitance value by sliding into contact with the signal track of the recording medium, and this projection. In the scanning needle, each of the protrusions passes through the bottom surface and extends across a first imaginary plane that longitudinally traverses the scanning needle, and the lower edge is formed by the bottom surface. a scanning needle that intersects the first virtual plane and further passes through the bottom plane;
fifth and fourth side surfaces that extend across a second virtual plane that traverses the bottom surface, and whose lower edges are defined by the bottom surface;
and a fifth ridge line sandwiched between the third side surface and defining the bottom surface, the length of which is regulated within the width of the No. 1 truck.
A scanning needle characterized by having a ta11 surface.