JPS5922250A - Scanning stylus of pickup - Google Patents

Abstract

PURPOSE:To prevent the reproduced output characteristic of a scanning stylus from an actual influence due to a virtual electrode before the scanning stylus reaches its mechanical limitation in a video disc player, by molding the 1st projection part to remove electrode metal dispersed and adhered to the lower end part of the 1st side of a base material and also molding the 2nd projection part to guide the scanning stylus to a grinding groove easily. CONSTITUTION:Since the 1st and 2nd projection parts 4, 6 are molded after fitting the electrode metal on the surface 8 of the scanning side, the dispersed metal adhered to the periphery of the scanning surface 7 is removed at the time of said molding. The electrode metal is not adhered to the 2nd and 3rd sides 42, 62. Since the 5th ridgeline 44 is arranged on the upper part of the 2nd shoulder part 61 in the 2nd side 42, the 1st side 25 is not adjacent to the scanning surface 7 even at the arrival of the life of the scanning stylus to be abrased by the 2nd projection part 6, so that significant electrode action is not generated even if the dispersed metal exists on the 1st side 25.

Description

【発明の詳細な説明】 発明の利用分野 不発Ｅ！ＡＶｉ記録媒体上の情報を静電容量値の変化と
して検出するピックアップの走査針に関し、例えば静電
容量式ビデオディスクプレーヤに適用されるものである
。[Detailed description of the invention] Field of application of the invention Misfire E! The present invention relates to a scanning needle of a pickup that detects information on an AVi recording medium as a change in capacitance value, and is applied to, for example, a capacitive video disc player.

従来技術とその間葭点 静電容量式ビデオディスクシステム例えばＣＥＤ力式で
は、第１図に示す如く、回転する円板状記録媒体０）に
走査針（Ｓ）を相対的に走行させ、信号溝との信号を走
査針の電極＠）と記録媒体の）の間の静電容量値の変化
として検出するものである。Prior art and other technologies In the capacitive video disk system, for example, the CED type, as shown in FIG. This signal is detected as a change in the capacitance between the scanning needle electrode @) and the recording medium.

（ｉｉ！溝上にはその延在方向に波長の短かい映像信号
（Ｖ）と、波長の長い音声信号（イ）とが多重記録され
ている。走査針（Ｓ）はその先端部が６角錐状に成形さ
れ、さらに記録媒体に対接する極く近傍にはいわゆるキ
イール状凸部すなわち該媒体の信号溝に摺接する摺接面
β）と、摩耗の進行があっても電極中を規定値以内にす
るための切入部（Ｃ）とを有する凸部が成形されている
基台（ＳＡ）と、該基台の走出側表面に配備された電極
層）とを備えている。(ii! On the groove, a video signal (V) with a short wavelength and an audio signal (A) with a long wavelength are multiplexed in the direction of its extension. The tip of the scanning needle (S) is a hexagonal pyramid. In addition, there is a so-called key-shaped convex portion (β) in the very vicinity that contacts the recording medium, that is, a sliding contact surface β) that slides into contact with the signal groove of the medium, and even if wear progresses, the inside of the electrode remains within the specified value. The present invention includes a base (SA) in which a convex portion having a cut-out portion (C) is formed to make the surface of the base (SA), and an electrode layer (an electrode layer) disposed on the surface of the base on the running side.

一般に、電極＠）は切欠部（Ｃ）の成形前に、基材に電
極金属を蒸着等で付着させることにより形成されるが、
飛散金属のまわり込み現象によって図中ドツトで示す如
く擬似電極便）が１記表面に隣接する２側面上に形成さ
れる。摺接面ｇ３）及び切欠部（Ｃ）ｆ′ｉ後加工で成
形されるので該当部にＶｉ擬似電極が形成されていない
が、後加工を受けない部分圧は図示の如く擬似電極が残
る。とくに稜線（Ｇｌ）と稜線（Ｇ２）の間の領域に付
いた擬似電極はその縁端部がトラック延在方向に１〜１
．５μの長さく摩耗の進行（て応じて長くなる）にわた
っており、これは本来の電極＠）の厚みに比べて実質的
に数〜１０倍の厚みを有することになり、高周波数のみ
ならず低周波数の信号に対しても悪影響を及はすことに
なる。従って、この擬似電極は不快な雑音を出力する原
因となり、しかもその傾向は摩耗の進行に伴なって大き
くなる。著しい場合、摺接面層）が切欠部（Ｃ）によっ
て形成された肩部（Ｇ３）近傍に達する機械的寿命の前
忙、電気的特性の劣化に基づき寿命に達する場合かある
。Generally, the electrode @) is formed by attaching electrode metal to the base material by vapor deposition or the like before forming the notch (C).
Due to the wrap-around phenomenon of the scattered metal, pseudo-electrode stools (as shown by the dots in the figure) are formed on the two side surfaces adjacent to the first surface. Since the sliding contact surface g3) and the notch (C) f'i are formed by post-processing, no Vi pseudo electrodes are formed in the corresponding parts, but pseudo electrodes remain as shown in the figure for partial pressures that are not subjected to post-processing. In particular, the edge of the pseudo electrode attached to the area between the ridge line (Gl) and the ridge line (G2) has a width of 1 to 1 in the track extension direction.
．． It spans a length of 5 μm as the wear progresses (and becomes longer as the wear progresses), which is effectively several to ten times as thick as the original electrode (@), and is effective not only at high frequencies but also at low frequencies. This will also have an adverse effect on frequency signals. Therefore, this pseudo electrode causes unpleasant noise to be output, and this tendency increases as wear progresses. In severe cases, the sliding contact surface layer may reach the vicinity of the shoulder (G3) formed by the notch (C) before reaching the end of its mechanical life, or its life may reach the end due to deterioration of electrical characteristics.

この様な擬似電極を除去する手段として、げ）サンドゲ
ラストの如き研磨粒を吹き付けることと、あるいは（ロ
）擬似電極の付設［ｆＩｉをラップ盤に当接させること
が考えられるか、前者は本来の電極層」も除去されるお
それがあること、またこｈを防止するためマスＮジグを
施こすことはその付設、除去の作業が付加され作業性を
害ない、また歩留りを低下させることにｔヨる。そして
後者は、異なる２側面を各々独立の工程としてラップ盤
に対接させなければならず、（−かも高精度で平行にす
る必要があるので、作業性及び歩留りが悪く、従って高
価なものとなる。As a means of removing such pseudo electrodes, (g) spraying abrasive grains such as sand gellast, or (b) attaching pseudo electrodes [fIi may be brought into contact with a lapping machine. There is a risk that the "electrode layer" may also be removed, and to prevent this, applying a mass N jig adds the work of attaching and removing it, which does not impair work efficiency and may reduce yield. Yoru. In the latter case, the two different sides must be brought into contact with the lapping machine in separate processes, and they must be made parallel with high precision, resulting in poor workability and yield, and is therefore expensive. Become.

発明の課題 を受けｔｌい構成のピックアップの走査針を提供しよう
どするものである。The object of the invention is to provide a scanning needle for a pickup having a small structure.

発明の要点 大略三角雌伏の走査針基台のト端部に、該基台の走出側
表面の両側に１対の切欠部を設けて形成される第１突部
と、該９！ｊ１突部のさらに下方に電極中を該基台の摩
耗進行方向に向けて一定値内に規制するだめの第２突部
とを備え、上記１対の切欠部はそれを構成する１対の側
面の交線である稜線のと端が丘記第２突部のｈ縁のｔ力
に配備されるように構成すること。Key Points of the Invention A first protrusion is formed by providing a pair of notches on both sides of the running-side surface of the base at the end of a roughly triangular female scanning needle base, and the 9! Further below the j1 protrusion, there is provided a second protrusion for regulating the inside of the electrode within a certain value in the direction of wear of the base, and the pair of notches form the pair of notches. The configuration is such that the end of the ridge line, which is the intersection line of the side surfaces, is placed at the t force of the h edge of the second protrusion.

発明の実施例 第２図は本発明の１実施例の構成斜視図、第３図は第２
図の針先部分の拡大斜視図である。Embodiment of the invention FIG. 2 is a perspective view of the configuration of one embodiment of the invention, and FIG.
It is an enlarged perspective view of the needle tip part of a figure.

走査針（１）は針基台（２）とこの針基台の１面に付設
された電極層（９）（ハツチングで示す、以下同じ）と
を備えている。針基台（２）はダイヤモンドを出発材料
として、針ホルダー（図示省略）に係合される柱状の胴
部体１）と、３角錐状の下部伐４とを０ｍえている。こ
の下部は記録媒体のトラックに対して走出側に配される
走出側表面圀）を画成する一対の第１稜線（２４１（２
４１と、該走出側表面（支））に隣接する一対の第１側
面＠５）効）″ｆ、画成する第２稜線り６）とを備えて
おり、さらにこの１部の下端部は上記トラックに整合す
るように次に第６図を参考にして説、明するように１祝
形されている（第２図では図の輻輳を避けるためこのト
端部の成形前の状態を示している）。The scanning needle (1) includes a needle base (2) and an electrode layer (9) (indicated by hatching, the same applies hereinafter) attached to one side of the needle base. The needle base (2) is made of diamond as a starting material, and has a columnar trunk body 1) engaged with a needle holder (not shown) and a triangular pyramid-shaped lower section 4, which are separated by 0 m. This lower part includes a pair of first ridge lines (241 (2
41, and a pair of first side faces adjacent to the running side surface (support), and a second ridge line 6) defining In order to match the above-mentioned track, it is shaped into a shape as described below with reference to Fig. 6 (Fig. 2 shows the state of this end before forming to avoid convergence of the figure). ing).

第３図に示す如く針基ぢ（２）はその下端部ンζ一対の
第１（／７７部（３０３１によって成形される第１突部
（４）と、一対の第２切欠部（６）（５）によって成形
される第２突部（６）と、記録媒体に対接する走査面（
７）とを備えている。As shown in FIG. 3, the needle base (2) has a pair of first protrusions (4) formed by a pair of first (/77) parts (3031) at its lower end, and a pair of second notches (6). (5) formed by the second protrusion (6) and the scanning surface (
7).

第１突部（４）は走出側表面の１す０側から内力に向け
て伸びる一対の肩部（４］１＠１１と、このＲ部の各内
端から下方に回けて伸びる一対の第２側面１４２）（４
４を（Ａｔλ−でおり、渠２側［ｆｉ＋４２１１４２）
は走出側表面との間に一対の第５稜線（４３１１４：３
］を、また互いの面を区分する第５稜線（４４１を（Ｒ
えている。この第５稜線は第２稜線（財）と走査面（７
）との間に酉！、されている。第２突部（６）は走出側
表面の両側から内力に回けて伸びる一対の胸部←１）（
６ｔｌと、この胸部の各内端からドカに向けて伸びる一
対の第６側向Ｉ２埠２）を備えており、各第５側面←２
）１２）は走出側表面との間に一対の第４稜線−′′・
−を有している。この第４稜線の間隔は針の使用時に第
２突部（６）が摩滅してもトラック中以上ｌ／Ｃｊよら
ないように規定されている。The first protrusion (4) has a pair of shoulders (4) 1@11 extending from the 10 side of the running side surface toward the internal force, and a pair of shoulders extending downward from each inner end of this R section. Second side 142) (4
4 (Atλ-, drain 2 side [fi+421142)
is a pair of fifth ridge lines (43114:3
], and the fifth ridge line (441) that separates the surfaces from each other (R
It is growing. This fifth ridge line is the second ridge line (goods) and the scanning plane (7
) and the rooster! , has been. The second protrusion (6) is a pair of chests that extend from both sides of the running side surface under internal force←1)(
6tl, and a pair of 6th side direction I2 pier 2) extending from each inner end of this chest toward Doka, and each 5th side ←2
)12) is a pair of fourth ridge lines −′′・
- has. The interval between the fourth ridge lines is determined so that l/Cj does not change more than the middle of the track even if the second protrusion (6) is worn out during use of the needle.

走査面（７）はトランクの延在方向に伸びる′第６稜線
Ｑりを境に対称的に形成された一対の斜面ｔ２３　ｅ）
を封し、各斜面は走出側表面（８）、第３側面−）、第
２側面（４１によってその上端が規定されている。The scanning plane (7) is a pair of slopes t23 that are symmetrically formed with the sixth ridge line Q extending in the extending direction of the trunk.
The upper end of each slope is defined by a running side surface (8), a third side surface (-), and a second side surface (41).

第１、第２突部（４）＋６）は走出側表面＋８１に電極
金属を付設しｚｔ後で加工成形されるので、走査面（７
）周辺に飛散金属が付着したとしてもこの加工時に除去
され、第２、第６側面（４２）り上には電極金属が付着
されていない。また、第２側面（ロ）は第５９．線＠）
が＠２２膚（６９のｔ力に配されるように形成されてい
るので、第２突部（６）が摩滅する走査針の寿命到来時
に至っても走査−面（７）Ｋ第１側面（ロ）が隣接しな
いから、仮に第１側面瞥上に飛散金属が存在していても
有意の重置作用をしｔｌい。The first and second protrusions (4) +6) are processed and formed after attaching electrode metal to the scanning surface +81, so that the scanning surface (7)
) Even if scattered metal is attached to the periphery, it is removed during this processing, and no electrode metal is attached on the second and sixth side surfaces (42). Also, the second side (b) is No. 59. line@)
Since it is formed so that it is placed at the t force of @22 skin (69), even when the second protrusion (6) wears out at the end of the life of the scanning needle, the scanning surface (7) K first side face ( (b) Since they are not adjacent, even if flying metal is present on the first side view, it will not have a significant overlapping effect.

尚木実施例では、１対のｉ８１稜線例、第５校線略、斜
面に）のそれぞれなす角α、β、γけそれぞれ５０〜６
０度、４０〜７０度、１４０度程度であり、また走出側
表面（８）と第２校線伐眠第５稜線（４勺の名父角δ、
θはぞれぞれ４０〜５５１ｆ、４５〜６５ｔ＋である。In Naoki's example, the angles α, β, and γ formed by a pair of i81 ridge lines (the fifth calibration line is omitted, and the slope) are each 50 to 6.
0 degrees, 40 to 70 degrees, and about 140 degrees, and the angles between the running side surface (8) and the fifth ridgeline of the second school line (four angles δ,
θ are 40 to 551f and 45 to 65t+, respectively.

また躬１月都（４１）は′第５稜線（１４）に半行ｅこ
建ひ−コ８・す、角δくθに設定されているのｔ１第２
校線（２（〃に対して第５稜縁（転）は例えば６〜１０
社の範囲でイ頃いている。更に、第１Ｍ郁い１）と第５
彼線（４・幻の距離、第５稜緑（４褐の長さはぞれぞれ
１０１１５μ、２０〜６０μとしている。In addition, the 5th ridgeline (14) has a half-line e-line 8, and the angle δ is set at θ.
For example, the 5th edge (turn) for the school line (2 (〃) is 6 to 10
It's been a long time since I've been in the company. Furthermore, the 1st M Ikui 1) and the 5th
The length of the line (4, phantom distance, 5th ridge green) is 10115μ and 20-60μ, respectively.

次に、第１、第２突部ｔ４１＋６１の成形手１１［ｔｉ
ｃついて説明する。ト部力・６角錐状にＩＪｖ、形され
た裁桐を用怠１−１走査側表向Ｖこ相当する表面ｈＫ通
常の薄膜形吠法、例えはスパッタリングによってチタニ
ウム電極（９）をＵ、１８〜０．２２μの厚さに付設す
る。Next, the forming hand 11 [ti
Let me explain about c. 1-1 The surface corresponding to the scanning side V is made of a titanium electrode (9) by a normal thin film forming method, for example by sputtering. It is attached to a thickness of 18 to 0.22μ.

次いでｆｆＪ４図に示す断面形状を何−Ｊ−る仙・磨体
（１りに、この基材ａ匂を第５図σ）Ｋ示す如く配置し
て両者を加圧トで相対走行させ、第５図（ロ）Ｖこ示す
如くり〔ル・ζして中間品−を装造する。研磨体（川は
ベース（１１ンの表面に渦巻状又は同心円状でＶ字形金
星する（叶賠溝（，１１ｂ　）が設けられて２す、ラン
ド部（１１ｃ　）と共にその表面にｔまダイヤモンド、
サファイヤ、硼化物、酸化物のＩＡ＠　＋＝　＜て脆い
材料からなる研磨粒が埋設又は被覆されていて、研磨粒
層０３）全形成している。基材醤はその稜線（１２ａ）
が研磨溝（１１ｂ）の延在方向に一致するように、そし
て研磨溝（１１ｂ）Ｋ対して角度Φを呈するように配置
され、その状態で研Ｍ前作を継続し、第５図（ロ）に示
す如く、第１突部（４）を有する中間品（１２（を製造
する。このどき、上記復原付設時に側面（財）とに飛散
付着した電極金属は同時に除去される。Next, the cross-sectional shape shown in Fig. 4 was arranged as shown in Fig. 5, and the two were moved relative to each other under pressure. Figure 5 (b) As shown in Figure 5, prepare the intermediate product. The surface of the polishing body (base) has a spiral or concentric V-shaped groove (11b), and the land portion (11c) and the surface thereof have diamonds,
Abrasive grains made of brittle materials such as sapphire, boride, and oxide are embedded or covered, and the entire polishing grain layer 03) is formed. The base sauce is its ridgeline (12a)
is arranged so that it coincides with the extending direction of the polishing groove (11b) and makes an angle Φ with respect to the polishing groove (11b) K, and in this state, the pre-polishing process is continued, and as shown in FIG. As shown in FIG. 1, an intermediate product (12) having a first protrusion (4) is manufactured. At this time, the electrode metal scattered and attached to the side surface (goods) during the above-mentioned restoring is removed at the same time.

この中ＩＣ１品Ｆ−１第６図に示す第２萌磨体０５）に
、稜線（１２ａ　）が＠磨溝（１５ａ）の延在方向：て
一致するように、そして電極形成面が研磨溝（１５ａ）
には＼：　Ｉｒｉ、ダする如く配置される。その状態で
両者倉加圧、相対走行させることにより（ν１磨溝（１
５ａ）に倣う形状の第２突部ｆ６Ｆｚ何する化６図の如
きノ［有刺が１ｆえ形される。尚、研磨溝（１５ａ）の
内包角は４５〜７５で沫さく１５ｂ）は１０〜１５μ、
す［磨溝（１５ａ）の間１」及び深さＶよそれぞれ約２
μ、４μである。尚（１５ｃ）は基台、Ｏ呻は研磨粒層
である。Among these, the IC1 product F-1 is placed on the second polishing body 05) shown in Fig. 6 so that the ridge line (12a) is aligned with the extending direction of the polishing groove (15a), and the electrode forming surface is aligned with the polishing groove. (15a)
＼： Iri, arranged as shown. In this state, by pressurizing both chambers and running them relative to each other (ν1 polishing groove (1
5a) The second protrusion f6Fz has a barbed shape as shown in Fig. 6. Incidentally, the included angle of the polishing groove (15a) is 45 to 75, and the included angle of the polishing groove (15b) is 10 to 15μ.
(1" between the polishing grooves (15a) and approximately 2" each from the depth V)
μ, 4μ. Note that (15c) is the base, and O is the abrasive grain layer.

第７図は木発りＪの他の実施例の中１７１品を示す斜視
図である。これは３角錐状の晶相の第２稜線（１２ａ）
を第４図の研磨溝（１１ｂ）に平行に配置して第１突部
（４１を成形したものである。FIG. 7 is a perspective view showing 171 items among other examples of Kibari J. This is the second ridgeline (12a) of the triangular pyramidal crystal phase.
is arranged parallel to the polishing groove (11b) in FIG. 4 to form the first protrusion (41).

本発明において、第１突部は電極）ヒ；成時忙基材の第
１側面の下端部に飛散付着した電極金属を除去する仁と
、＠２２突の成形のため研磨溝への案内を容易にするこ
とを担うものであるから、第１膚部及び第２側面はこの
要請を満たす限り図示の形状に限らず種々の態様にｆ形
しても良いことは′言９までもない。In the present invention, the first protrusion is an electrode); a groove for removing the electrode metal scattered and attached to the lower end of the first side of the busy base material; and a guide to the polishing groove for forming the @22 protrusion. Needless to say, the first skin part and the second side surface are not limited to the shape shown in the drawings, but may be formed in various f-shapes as long as this requirement is met.

発明の効果 電極面及び走査面に隣接する全側面上に、電極ｆヒ成時
のフ１勉教金属が残らないように構成したので、走査針
の今命に至る全７ｔＪｉ聞シでおいて正規の電極以外の
電極（４ｉ−ａｔｉ＋：極）か形成されずノイズを拾う
お・それがない。また、この構成にするため第１突部を
形成することは次いで第２突部を形成するための作業性
、歩留り向ＩＫ寄与するという副次的効果を期待できる
ものである。Effects of the Invention Since the structure is configured so that no metal remains on the electrode surface and all sides adjacent to the scanning surface when the electrode f is heated, it is possible to prevent the metal from remaining on the electrode surface and the entire side surface adjacent to the scanning surface. No electrodes other than the regular electrodes (4i-ati+: poles) are formed and there is no risk of picking up noise. Further, forming the first protrusion for this configuration can be expected to have the secondary effect of contributing to the workability and yield direction IK for forming the second protrusion.

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

第１図は記録媒体のトラック方向の断面図と共に不す従
来の疋査針の側面図。第２図は本発明の１７（施例の構
成斜視図、第６図は第２図の針先部分の拡大斜視図。第
４図は第１研磨体を研磨溝に直交する方向で切断して示
す部分断面図（該研磨溝に押入される基材の背面図を並
記している）。 第５図（イ）←）は研暦伏態を説明する第１研磨体の部
分側断面図（基材は側面図で示している）で、（イ）は
研磨直前、（ロ）は研磨完了直後の状態を示している。 ＠６図は第２研磨体を研磨溝に直交する方向で切断して
示す部分断面図を、該研磨溝に係合される走査針の中間
品の背面図と共に示す説明図である。第７図は本発明の
他の実施例の中間品の斜視図である。 王な図番の説明 （２）・・・走査針基台、（３）、（６）・・・第１、
＄２切大部、１４１璋ｌ）・・・第１、第２Ｒ部、シ４
）（財）Ｈ３１（６相炉・・第１、第２、第３、第４、
第５稜線、（７）・・・走査面。 第１図 第４図 第７図 −２５１−FIG. 1 is a cross-sectional view of a recording medium in the track direction and a side view of a conventional scanning needle. Fig. 2 is a perspective view of the structure of the 17th embodiment of the present invention, Fig. 6 is an enlarged perspective view of the tip of the needle in Fig. 2, and Fig. 4 shows the first abrasive body cut in the direction perpendicular to the abrasive groove. (A rear view of the base material pushed into the polishing groove is also shown.) Figure 5 (a) ←) is a partial side sectional view of the first polishing body illustrating the polishing state. (The base material is shown in a side view), (a) shows the state immediately before polishing, and (b) shows the state immediately after polishing is completed. Figure @6 is an explanatory view showing a partial cross-sectional view of the second polishing body cut in a direction perpendicular to the polishing groove, together with a rear view of an intermediate product of the scanning needle that is engaged with the polishing groove. FIG. 7 is a perspective view of an intermediate product according to another embodiment of the present invention. Explanation of the main figure numbers (2)...Scanning needle base, (3), (6)...1st,
$2 Kiridaibu, 141㎋l)...1st, 2nd R section, shi4
) (Foundation) H31 (6 phase reactor... 1st, 2nd, 3rd, 4th,
Fifth ridgeline, (7)... scanning plane. Figure 1 Figure 4 Figure 7 -251-

Claims (1)

【特許請求の範囲】[Claims] ｉｌｌ　　記録媒体のトラックに対向する先端部を、該
トラックに対する走出側表面を画成する一対の第１稜線
及び該走出側表面に隣接する一対の第１側面を画成する
第２稜線を有する大略三角錐状に成形してなる走査針基
台と、前記走出側表面上に配備しｆｃ両電極を有するピ
ックアップの走査針において、前記走査針基台Ｖ１前前
記用側表面の両側からそれぞれ内方に向けて伸びる１対
の第１肩部及び該第１肩部の各内端から下方忙伸びる一
対の第３稜線を有する１対の第１切欠部と、ｌｔＪ記第
３稜線の下端から内方に向けて伸びる第２肩部及び該第
２肩部の内端から下方に伸びる第４稜線を有する第２切
欠部と、前記トラックに対接する走査面と、前記第１切
大部によって形成゛されかつ前記走査面から前記第２肩
部の上方域まで伸びる第５稜線で画成される１対の第２
側面とを備えてなるピックアップの走査針。ill The leading end of the recording medium facing the track generally has a pair of first ridgelines defining a running side surface with respect to the track and a second ridgeline defining a pair of first side surfaces adjacent to the running side surface. In the scanning needle of the pickup having a scanning needle base formed in a triangular pyramid shape and having both f and c electrodes disposed on the scanning side surface, inward from both sides of the use side surface in front of the scanning needle base V1. a pair of first notches, each having a pair of first shoulders extending toward and a pair of third ridge lines extending downwardly from each inner end of the first shoulders; a second notch portion having a second shoulder portion extending toward the direction and a fourth ridge line extending downward from the inner end of the second shoulder portion, a scanning surface that contacts the track, and the first cutout portion. a pair of second ridges defined by a fifth ridge line extending from the scanning plane to an area above the second shoulder portion;
A pickup scanning needle comprising a side surface and a side surface.