201109679 六、發明說明： 【發明所屬之技術領域】 該發明是關於··利用於各種機器內的位置檢測’而具 備有旋轉軸的自動回復機構的電位計。 【先前技術】 第1圖是這種電位計的習知例，是顯示爲專利文獻1 記載的電位計的分解立體圖。 在第1圖，11是滑動件座，在其底板11a的中央部突 出設置有轂部lib，並且軸部11c從中央部朝向上方、下 方而形成。在底板11a的外周保持預定的角度而豎立設置 有一對限制壁1 1 d、1 1 e。 1 2是螺旋線圈彈簧，具有：捲繞轂部1 1 b的複數圈的 積疊部1 2 a、以及在解放端的上部彎折部1 2 b與下部彎折 部12c，13是收容滑動件座11的殼體，殼體13具有缺口 部13a，缺口部13a的兩側緣成爲彈簧座13b、13c。 14是固定在滑動件座η的下面的滑動件，15是固定 於殼體13的開放面的絕緣基板。在絕緣基板15的上面形 成有：讓滑動件1 4滑動的電阻體圖案丨5 a。 滑動件座11的上方的軸部11C被殻體13的孔部l3d 支承’下方的軸部11c被絕緣基板15的孔部15b支承。 螺旋線圈彈簧1 2的上部彎折部丨2 b，如第2圖所示，被彈 簧座13b及限制壁ud彈壓卡止，下部彎折部12c被彈簧 座1 3 c及限制壁1 1 e彈壓卡止。 -5- 201109679 在該電位計，當從第2圖的靜止狀態將軸部1 1 c朝逆 時鐘方向旋轉時，如第3圖所示，滑動件座1 1的左方的 限制壁1 1 e，克服螺旋線圈彈簧1 2的彈性，將螺旋線圏彈 簧12的下部彎折部12c朝逆時鐘方向按壓，螺旋線圈彈 簧1 2的上部彎折部1 2b則卡止於殼體1 3的彈簧座1 3b , 讓限制壁1 1 d朝逆時鐘方向旋轉。期間滑動件1 4於電阻 體圖案1 5 a上朝逆時鐘方向滑動，藉由電阻値變化而得到 所需要的輸出訊號。 這裡若去除軸部1 1 c的旋轉力的話，則藉由螺旋線圏 彈簧1 2的彈性回復力，將下部彎折部1 2c朝順時鐘方向 按壓，則滑動件座1 1及螺旋線圈彈簧1 2會回復到第2圖 的原本的靜止狀態。 同樣地，當從第2圖的靜止狀態將軸部1 1 c朝順時鐘 方向旋轉時，滑動件座11的右方的限制壁lid按壓螺旋 線圈彈簧1 2的上部彎折部1 2b，螺旋線圈彈簧1 2的下部 彎折部1 2 c就這樣卡止於殻體1 3的彈簧座1 3 c，讓限制壁 1 1 e朝順時鐘方向旋轉。藉此，滑動件1 4於電阻體圖案 1 5 a上朝順時鐘方向滑動，而得到所需要的輸出訊號。 〔先前技術文獻〕 〔專利文獻〕 〔專利文獻1〕 曰本實用新案登錄第2533523號公報 【發明內容】 -6- 201109679 〔發明欲解決的課題〕 在上述構造的電位計，設置於滑動件座1 1的限制壁 Ud、lie的各端面、及設置於殼體13的彈簧座13b、13c 的各端面’都是構成平面，所以螺旋線圈彈簧1 2的上部 彎折部1 2b或下部彎折部i 2 c、與該限制壁1 1 d、1 1 e、彈 簧座13b、13c的接觸是基本的線接觸。 另一方面，限制壁1 Id、1 le的端面與彈簧座13b、 13c的端面，因爲尺寸公差等，而例如在第2圖的靜止狀 態（中立狀態），面部不會確實地一致，也就是會產生一 對限制壁1 1 d ' 1 1 e之間的間隔較一對彈簧座i 3b、1 3 c之 間的間隔更寬這樣的狀態或其相反的狀態。 在一對限制壁1 1 d、1 1 e之間的間隔較一對彈簧座1 3 b 、1 3 c之間的間隔更寬的情況，螺旋線圈彈簧1 2的上部彎 折部12b及下部彎折部l2c’在第2圖的中立位置，產生 了 ：僅與彈簧座1 3 b、1 3 c彈性接觸，沒有接觸於限制壁 1 1 d、1 1 e這樣的狀態，在與其相反的一對限制壁丨！ d、 1 1 e之間的間隔較一對彈簧座1 3 b、1 3 c之間的間隔更狹窄 的情況，會產生：上部彎折部1 2b及下部彎折部丨2c僅彈 性接觸於限制壁1 1 d、1 1 e，而不會接觸於彈簧座1 3 b、 1 3 c的狀態。 在該狀態，上部彎折部1 2b或下部彎折部1 2c、與限 制壁1 1 d、1 1 e、彈簧座1 3 b、1 3 c成爲線接觸的構造，所 以藉由線接觸而規定了上部彎折部1 2b、下部彎折部1 2c 的延伸方向，也就是限制擦曲的原因。而如果產生這種狀 201109679 態的話，在中立位置不會完全限制軸部1 1 c的旋轉，會產 生晃動，該晃動情形會導致檢測精度的降低。 本發明的目的，是鑑於上述問題’要提供一種電位計 ，即使在中立位置’旋轉軸也不會產生晃動’檢測精度很 優異。 〔用以解決課題的手段〕 藉由該發明，在殼體內，收容有：形成有電阻體圖案 的基板、固定有與電阻體圖案滑動接觸的滑動件的轉子、 及螺旋線圈彈簧；插通螺旋線圏彈簧而與轉子結合的旋轉 軸，從殼體突出的電位計，轉子’具備有：包圍螺旋線圈 彈簧而沿著螺旋線圈彈簧的外徑爲剖面圓弧狀的一對彈簧 導引部；螺旋線圈彈簧的朝直徑方向導出的兩端部，彈性 接觸於：於一對彈簧導引部的其中一方的彈簧導引部的周 方向兩端面及殼體的內周面處突出設置的彈簧座的周方向 兩端面，其中一方的彈簧導引部的周方向兩端面及彈簧座 的周方向兩端面是作成分別與螺旋線圈彈簧的兩端部點接 觸的形狀。 〔發明效果〕 使旋轉軸自動回復的螺旋線圈彈簧的兩端部，爲點接 觸於轉子的彈簧導引部的兩端面及殼體的彈簧座的兩端面 的構造。於是，例如即使因爲尺寸公差而在中立位置，彈 簧導引部的兩端面與彈簧座的兩端面沒有一致，而與習知 -8 - 201109679 的線接觸構造不同，沒有限定螺旋線圏彈簧的兩端 狀，而能期待撓曲情形，也就是藉由讓兩端部撓曲 得到螺旋線圈彈簧的兩端部良好地彈性接觸於轉子 導引部與殼體的彈簧座的雙方的狀態。藉此’藉由 ，則可防止中立位置的轉子及旋轉軸的晃動，藉此 檢測精度優異的電位計。 【實施方式】 藉由實施例參考該發明的實施方式來說明。 第4A圖、第4B圖是顯示本發明的電位計的一 的外觀，第5A圖 '第5B圖是顯示其剖面構造。第 將各部分分解顯示的顯示圖》 殻體20，具有圓筒狀的基體21，在基體21的 是從其外周面突出形成有方形狀板部22，在基體’‘ 面側，從其外周面朝互相相反方向凸緣狀地大幅突 對安裝部23。在基體21的前面突出形成有階段狀 部24 〇 在殻體20的圓筒部24收容配置有軸承31，在 安裝部23的各套筒孔23a收容配置有金屬製的套 殻體2〇及軸承31，分別以合成樹脂製成，在該例 承31及套筒32是內嵌成型於殼體20。殼體20及 ’以合成樹脂製成，而也可在殼體20使用高剛性 性優異的樹脂，在軸承3 1使用耐磨耗性優異的樹月丨 轉子40具有：板部41、及在該板部41的其中 部的形 ，則可 的彈簧 該發明 可獲得 實施例 6圖是 背面側 21的前 出有一 的圓筒 一對的 筒32 ° 子，軸 軸承3 1 且難燃 I ° 一面突 -9 - 201109679 出形成的一對彈簧導引部、2、43，是以合成樹 的彈簧導引部42、43，分別作成剖面圓弧狀， 同一圓周上。板部41作成圓板狀，位於其中 導引部43的外周側的部分作成缺口形狀。 旋轉軸33爲金屬製成，在其中一端部形 形部33a，且在長橢圓形部33a的前端面突出 徑的軸部33b。旋轉軸33其長橢圓形部33a內 子40的板部41，而與轉子40 —體化，位於 42、43的構成圓弧的中心。形成於長橢圓形部 面的軸部33b是從轉子40的板部41的背面側 在轉子40的板部4 1的背面側安裝有滑動 部4 1的背面，如第7圖所示，突出形成有： 入部44、熱斂縫部45、及導引部46。滑動件 彈性的金屬製成，形成有：推壓螺母部34a、 、與缺口 34c。將滑動件34的推壓螺母部34a 40的推壓螺母壓入部44，將轉子40的熱斂鬆 於敛縫孔34b，藉由進行熱敛縫處理而將滑動ί 定於轉子40。轉子40的導引部46以及與其_ 應的滑動件34的缺口 34c，功能爲滑動件34 引部。 螺旋線圈彈簧35，插通於旋轉軸33而被 40的一對彈簧導引部42、43內的空間。一對 42、43沿著螺旋線圈彈簧3 5的外徑而圍繞螺 3 5，藉此將螺旋線圈彈簧3 5外接保持於一對 脂製。一對 該圓弧位於 一方的彈簧 成有長橢圓 形成有小直 嵌成型於轉 彈簧導引部 33a的前端 突出。 件3 4。在板 推壓螺母壓 3 4作成具有 斂縫孔34b 壓入到轉子 I部45插通 牛34安裝固 寥引部46對 組裝時的導 收容於轉子 彈簧導引部 旋線圈彈簧 彈簧導引部 -10- 201109679 42 、 43 〇 旋轉軸33插通於軸承31的孔部31a而被軸支承，該 軸承31內嵌成型於殼體20。在殼體20的圓筒部24，是 在軸承31的外側配置有端頭密封部36，並且配置有：用 來限制端頭密封部3 6移動的墊片3 7、E型環3 8。E型環 38嵌入於：設置於旋轉軸33的E型環插入溝33c。殼體 2〇的前面側是藉由端頭密封部3 6所密封。 在殻體20的基體2 1的背面側開口部安裝有基板50。 基板50是由：圓環狀部51、與從其外周的一部分突出成 方型的突出部52所構成。在圓環狀部51，同心狀地形成 有作成圓弧狀的一對電阻體圖案53' 54，並且形成有：與 該各電阻體圖案53、54的兩端連接，通過圓環狀部51而 到達突出部52的前端的導體圖案55〜57。電阻體圖案53 、54是例如將混有碳粒子的樹脂膏進行印刷、焙燒所形成 ，導體圖案55〜57是藉由將銀膏進行印刷、焙燒所形成 〇 在各導體圖案55〜57的前端，貫穿基板50而分別形 成有端子插入孔5 8，分別將端子6 1斂縫安裝於該端子插 入孔58。在第6圖，端子61的斂縫部61a是顯示爲斂縫 處理後的形狀。 將基板50壓入到殻體20的基體21內’抵接到在基 體21內設置的抵接部21a而予以收容。藉此’讓安裝於 轉子40的滑動件34與電阻體圖案53、54壓接。而在轉 子40的板部41的背面側包圍軸部33b而突出形成的環狀 62 201109679 部47，是位於基板5 0的開口 5 9內。 在殼體20的基體21的背面側開口部又安裝有外殼 。是藉由將設置在殼體20的基體21內的熱斂縫部21b 行熱斂縫處理，而將殼體6 2固定。在外殼62的內面形 有：用來將在旋轉軸33的前端形成的軸部33b予以軸 承的軸承孔62a，軸部33b被該軸承孔62a所軸支承。 在安裝於殼體2〇的外殼62的周圍，如第5A圖、 5B圖所示，塗佈、充塡有黏接劑63，藉此將殻體20的 面側密封。在該例子中，在殼體20內部’在端子61的 置的部分設置有空間部，在端子61的周圍及斂縫部ί 的周圍也如第5 Β圖所示充塡有黏接劑6 3。藉此，則堅 地固定著端子6 1，而可以防止端子6 1間的移位。除此 外，在例如在碳鋼實施鍍錫處理來構成端子61的情況 可以阻止鍍錫的錫鬚的成長。 接著，針對朝螺旋線圈彈簧3 5的直徑方向導出的 端部35a、35b的殻體20內的位置、卡止狀態，參考 8A圖、第8B圖來說明。 第8A圖、第8B圖是顯示旋轉軸33位於中立位置 狀態，螺旋線圈彈簧35的兩端部35a、35b，彈性接觸 轉子40的彈簧導引部43的周方向兩端面43a、43b，彈 接觸於：圓弧狀地突出設置於殻體20的內周面的彈簧 25的周方向兩端面25a、25b。 螺旋線圈彈簧35的兩端部35a、35b、與彈簧導引 43的兩端面43a、43b及彈簧座25的兩端面25a、25b 進 成 支 第 背 位 1 a 固 之 兩 第 的 於 性 座 部 都 -12- 201109679 是作成以點接觸方式接觸的構造。在該例子中，螺旋線圈 彈簧35的端部35a' 3 5b各個前端是與彈簧座25的端面 25a、25b點接觸，在端面35a與端面25a之間、以及端部 3 5b與端面25b之間，構成了分別朝向轉子40的中心擴展 的楔形狀的空間。另一方面，彈簧導引部43的端面43a、 43b，在其內周側角部，分別與螺旋線圈彈簧3 5的端部 35a、3 5b點接觸，在端面35a與端面43a之間、以及端部 3 5 b與端面4 3 b之間，構成了分別朝向轉子4 0的外周側擴 展的楔形狀的空間》 由於彈簧導引部43的兩端面43a、43b以及彈簧座25 的兩端面25 a、2 5 b是作成：分別與螺旋線圈彈簧3 5的兩 端部35a、35b點接觸的形狀，所以螺旋線圈彈簧35的兩 端部35a、3 5b容易撓曲，因此在中立狀態等，即使因爲 尺寸公差等而讓彈簧導引部43的兩端面43a、43 b與彈簧 座25的兩端面25a、25b沒有一致，而藉由螺旋線圈彈簧 3 5的兩端部3 5 a、3 5b撓曲，而讓螺旋線圈彈簧3 5的兩端 部3 5a、3 5b良好地彈性接觸於彈簧導引部43及彈簧座25 雙方，則能讓轉子40及旋轉軸33不會產生晃動。 如同在該例子中，在螺旋線圏彈簧35的端部3 5a、 3 5b之間構成楔形狀的空間的方式，也可在彈簧導引部43 的兩端面43a、43b及彈簧座25的兩端面25a、25b設置 所需要的傾斜部，也就是作成傾斜面，而例如作成曲面也 可以。 第9A圖、第9B圖是分別顯示旋轉軸33朝逆時鐘方 -13- 201109679 向及順時鐘方向旋轉的狀態，轉子40的彈簧導引部43， 在第9A圖，克服螺旋線圈彈簧3 5的彈性而按壓其端部 3 5a，在第9B圖則是克服彈性而按壓其端部35b。藉由轉 子40的旋轉而讓滑動件34滑動於基板50的電阻體圖案 53、54上，而可從端子61獲得所希望的輸出訊號。當解 除旋轉軸33的旋轉力時，藉由螺旋線圈彈簧35的彈性復 原力，則轉子40及旋轉軸33會回復到第8A圖所示的原 本的中立位置。 如以上所說明，藉由該例子，在中立位置可以防止旋 轉軸33的晃動情形。而由於螺旋線圈彈簧35是外接於轉 子40的一對彈簧導引部42、43而被保持，所以彈簧的軸 部不會傾斜，不會產生沒有預期的變形，因此可以得到良 好的旋轉性能。 該電位計例如使用於電動代步車或速克達等的油門加 速踩入量的檢測等。 【圖式簡單說明】 第1圖是習知的電位計的分解立體圖。 第2圖是第1圖所示的電位計的靜止狀態（中立位置 )的剖面圖。 第3圖是第1圖所示的電位計的動作狀態的剖面圖。 第4A圖是顯示該發明的電位計的一實施例的立體圖 ，第4B圖是其正視圖。 第5A圖是第4B圖的C一 C線剖面圖，第5B圖是第 -14- 201109679 4 B圖的D - D線剖面圖。 第6圖是第4A圖所示的電位計的分解立體圖。 第7圖是用來說明滑動件對轉子的安裝的圖面。 第8A圖是當旋轉軸在中立位置的狀態時的剖面圖， 第8B圖是其局部放大圖。 第9A圖是旋轉軸朝逆時鐘方向旋轉時的狀態的剖面 匾1 ’第9B圖是當旋轉軸朝順時鐘方向旋轉時的狀態的剖 面圖。 【主要元件符號說明】 11 :滑動件座 1 2 :螺旋線圈彈簧 13 :殼體 1 4 :滑動件 1 5 :絕緣基板 2〇 :殼體 21 :基體 22 :方形狀板部 23 :安裝部 24 :圓筒部 25 :彈簧座 3 1 :軸承 32 :套筒 33 :旋轉軸 -15- 201109679 34 ： 35 ： 36 ： 37 ： 38 ： 40 ： 41 ： 4 2、 44 ： 45 ： 46 ： 47 ： 50 ： 5 1: 52 ： 5 3、 55 -5 8 ： 59 ： 61 ： 62 ： 滑動件 螺旋線圈彈簧 端頭密封部 墊片 E型環 轉子 板部 43 :彈簧導引部 推壓螺母壓入部 熱斂縫部 導引部 環狀部 基板 圓環狀部 突出部 54 :電阻體圖案 57 :導體圖案 端子插入孔 開口 端子 外殼 63 :黏接劑[Technical Field] The present invention relates to a potentiometer having an automatic recovery mechanism for a rotating shaft, which is used for position detection in various devices. [Prior Art] Fig. 1 is a perspective view showing a conventional example of such a potentiometer, which is an exploded perspective view of the potentiometer described in Patent Document 1. In Fig. 1, reference numeral 11 denotes a slider holder, and a boss portion lib is protruded from a central portion of the bottom plate 11a, and the shaft portion 11c is formed upward and downward from the center portion. A pair of restriction walls 1 1 d, 1 1 e are erected at a predetermined angle on the outer circumference of the bottom plate 11a. 1 2 is a spiral coil spring having: a stacking portion 1 2 a of a plurality of turns of the winding hub portion 1 1 b, and an upper bent portion 1 2 b and a lower bent portion 12c at the liberation end, 13 is a receiving slider The housing of the housing 11 has a cutout portion 13a, and both side edges of the cutout portion 13a serve as spring seats 13b and 13c. 14 is a slider fixed to the lower surface of the slider holder n, and 15 is an insulating substrate fixed to the open face of the casing 13. On the upper surface of the insulating substrate 15, a resistor pattern 丨5a for sliding the slider 14 is formed. The shaft portion 11C above the slider holder 11 is supported by the hole portion 13d of the casing 13. The lower shaft portion 11c is supported by the hole portion 15b of the insulating substrate 15. The upper bent portion 丨2 b of the helical coil spring 12 is locked by the spring seat 13b and the regulating wall ud as shown in Fig. 2, and the lower bent portion 12c is biased by the spring seat 1 3 c and the regulating wall 1 1 e The pressure is locked. -5- 201109679 In this potentiometer, when the shaft portion 1 1 c is rotated in the counterclockwise direction from the stationary state of Fig. 2, as shown in Fig. 3, the left restricting wall 1 of the slider holder 1 1 e, against the elasticity of the helical coil spring 12, the lower bent portion 12c of the helical twist spring 12 is pressed in the counterclockwise direction, and the upper bent portion 1 2b of the helical coil spring 12 is locked to the casing 13 The spring seat 1 3b rotates the restriction wall 11 1 in the counterclockwise direction. During the period, the slider 14 slides in the counterclockwise direction on the resistor pattern 15a, and the desired output signal is obtained by the resistance 値 change. When the rotational force of the shaft portion 1 1 c is removed, the lower bending portion 1 2c is pressed in the clockwise direction by the elastic restoring force of the helix spring 12, and the slider seat 1 1 and the coil spring are rotated. 1 2 will return to the original stationary state of Figure 2. Similarly, when the shaft portion 1 1 c is rotated in the clockwise direction from the stationary state of FIG. 2, the right restricting wall lid of the slider holder 11 presses the upper bent portion 1 2b of the helical coil spring 12, and the spiral The lower bent portion 1 2 c of the coil spring 12 is thus locked to the spring seat 13 c of the casing 13 and the regulating wall 11 e is rotated in the clockwise direction. Thereby, the slider 14 slides in the clockwise direction on the resistor pattern 15a to obtain the desired output signal. [PRIOR ART DOCUMENT] [Patent Document 1] [Patent Document 1] Japanese Patent Application Laid-Open No. 2533523 [Summary of the Invention] -6- 201109679 [Problems to be Solved by the Invention] The potentiometer having the above structure is provided in the slider holder. The end faces of the restricting walls Ud and lie of 1 1 and the end faces ' of the spring seats 13b and 13c provided in the casing 13 are all flat, so the upper bent portion 1 2b or the lower portion of the helical coil spring 12 is bent. The contact of the portion i 2 c with the restriction walls 1 1 d, 1 1 e and the spring seats 13b, 13c is a basic line contact. On the other hand, the end faces of the restricting walls 1 Id and 1 le and the end faces of the spring seats 13b and 13c are not uniformly aligned due to dimensional tolerances and the like, for example, in the stationary state (neutral state) of Fig. 2, that is, A state in which the interval between the pair of restricting walls 1 1 d ' 1 1 e is wider than the interval between the pair of spring seats i 3b and 1 3 c or a state opposite thereto is generated. The upper bent portion 12b and the lower portion of the helical coil spring 12 are wider when the interval between the pair of restricting walls 1 1 d and 1 1 e is wider than the interval between the pair of spring seats 1 3 b and 1 3 c The bent portion l2c' is in the neutral position of Fig. 2, and is produced in a state in which it is in elastic contact only with the spring seats 1 3 b and 1 3 c, and is not in contact with the restricting walls 1 1 d and 1 1 e. A pair of restricted niches! When the interval between d and 1 1 e is narrower than the interval between the pair of spring seats 1 3 b and 1 3 c, it may occur that the upper bent portion 1 2b and the lower bent portion 丨 2c are only in elastic contact with each other. The walls 1 1 d, 1 1 e are restrained from contact with the spring seats 1 3 b, 1 3 c. In this state, the upper bent portion 1 2b or the lower bent portion 1 2c has a structure in which the restricting walls 1 1 d and 1 1 e and the spring seats 1 3 b and 1 3 c are in line contact, so that the contact is made by line contact. The direction in which the upper bent portion 1 2b and the lower bent portion 1 2c extend is defined, that is, the cause of the buckling is restricted. On the other hand, if the state of 201109679 is generated, the rotation of the shaft portion 1 1 c is not completely restricted at the neutral position, and sway is generated, which causes a decrease in detection accuracy. SUMMARY OF THE INVENTION An object of the present invention is to provide a potentiometer in view of the above problems, which does not cause rattling even in a neutral position 'rotation axis'. [Means for Solving the Problem] According to the invention, a substrate on which a resistor pattern is formed, a rotor to which a slider that is in sliding contact with the resistor pattern is fixed, and a spiral coil spring are housed in the casing; a rotary shaft that is coupled to the rotor by a coil spring, and a potentiometer that protrudes from the housing, the rotor 'is provided with a pair of spring guides that surround the spiral coil spring and have an arc-shaped cross section along the outer diameter of the coil spring; Both end portions of the spiral coil spring that are led out in the radial direction are elastically contacted with a spring seat projecting from both end faces of the spring guide portion of one of the pair of spring guide portions and the inner peripheral surface of the casing. Both end faces of the circumferential direction of the spring guide portion and the circumferential end faces of the spring seat are formed to be in point contact with both end portions of the coil spring. [Effect of the Invention] Both ends of the helical coil spring that automatically returns the rotating shaft are in contact with both end faces of the spring guiding portion of the rotor and both end faces of the spring seat of the casing. Thus, for example, even in the neutral position due to the dimensional tolerance, the both end faces of the spring guide portion do not coincide with the end faces of the spring seat, and unlike the wire contact configuration of the conventional -8 - 201109679, the two of the helix springs are not limited. In the end shape, it is expected that the deflection is obtained, that is, the both end portions of the spiral coil spring are in good elastic contact with both of the rotor guide portion and the spring seat of the casing by bending the both end portions. By this, it is possible to prevent the rotor of the neutral position and the rotation axis from being shaken, thereby detecting a potentiometer having excellent precision. [Embodiment] An embodiment will be described with reference to an embodiment of the invention. Figs. 4A and 4B are views showing the appearance of one of the potentiometers of the present invention, and Fig. 5A is a sectional view showing the structure of Fig. 5B. The display case in which the respective portions are exploded and displayed. The casing 20 has a cylindrical base body 21, and the base body 21 has a square-shaped plate portion 22 projecting from the outer peripheral surface thereof, on the side of the base body side, from the outer periphery thereof. The mounting portion 23 is largely protruded in a flange shape toward the opposite directions. A stepped portion 24 is formed in a front surface of the base body 21, and a bearing 31 is housed in the cylindrical portion 24 of the casing 20, and a metal casing 2 is placed in each of the sleeve holes 23a of the mounting portion 23. The bearings 31 are each made of synthetic resin, and the example 31 and the sleeve 32 are insert-molded into the casing 20. The case 20 and 'made of a synthetic resin, and a resin excellent in high rigidity can be used for the case 20, and the tree sill rotor 40 excellent in wear resistance is used for the bearing 31. The plate portion 41 has a plate portion 41 and The shape of the middle portion of the plate portion 41 is a spring. The invention can be obtained in the sixth embodiment. The figure is a pair of cylinders 32° in front of the back side 21, the shaft bearing 3 1 and the flame retardant I ° The pair of spring guides 2, 43 formed by one side -9 - 201109679 are formed by the spring guiding portions 42 and 43 of the synthetic tree, respectively, in a circular arc shape on the same circumference. The plate portion 41 is formed in a disk shape, and a portion on the outer peripheral side of the guide portion 43 is formed in a notch shape. The rotary shaft 33 is made of a metal, and has a one end portion 33a therein, and a shaft portion 33b that protrudes in the front end surface of the oblong portion 33a. The plate portion 41 of the inner portion 40 of the long elliptical portion 33a of the rotary shaft 33 is formed integrally with the rotor 40, and is located at the center of the circular arc at 42, 43. The shaft portion 33b formed on the long elliptical portion surface is a rear surface on which the sliding portion 41 is attached to the back side of the plate portion 41 of the rotor 40 from the back side of the plate portion 41 of the rotor 40, as shown in Fig. 7, The inlet portion 44, the heat caulking portion 45, and the guide portion 46 are formed. The slider is made of an elastic metal and is formed by pressing the nut portion 34a and the notch 34c. The pressing nut of the pressing nut portion 34a 40 of the slider 34 is pressed into the portion 44, and the heat of the rotor 40 is loosened by the caulking hole 34b, and the sliding is determined by the heat caulking treatment. The guide portion 46 of the rotor 40 and the notch 34c of the slider 34 therewith function as a guide portion of the slider 34. The helical coil spring 35 is inserted into the space inside the pair of spring guiding portions 42, 43 of the rotating shaft 33. A pair of 42, 43 surrounds the screw 35 along the outer diameter of the coil spring 35, whereby the coil spring 35 is externally held in a pair of grease. A pair of springs having one side of the circular arc has a long ellipse formed with a small straight projection formed at the front end of the rotating spring guiding portion 33a. Item 3 4. The plate presses the nut pressure 3 4 to have the caulking hole 34b. The press-fitting hole 34b is pressed into the rotor 1 portion 45. The inserted bobbin 34 is attached to the solid guide portion 46. The guide is accommodated in the assembly of the rotor spring guide portion and the coil spring spring guide portion. -10- 201109679 42 , 43 The 〇 rotating shaft 33 is inserted into the hole 31 a of the bearing 31 and is axially supported. The bearing 31 is insert-molded into the casing 20 . In the cylindrical portion 24 of the casing 20, a tip seal portion 36 is disposed outside the bearing 31, and a spacer 3 7 and an E-ring 38 for restricting the movement of the tip seal portion 36 are disposed. The E-ring 38 is fitted in an E-ring insertion groove 33c provided in the rotating shaft 33. The front side of the housing 2 is sealed by a tip seal 36. The substrate 50 is attached to the opening on the back side of the base 21 of the casing 20. The substrate 50 is composed of an annular portion 51 and a protruding portion 52 that protrudes from a part of the outer circumference thereof. In the annular portion 51, a pair of resistor patterns 53'54 formed in an arc shape are formed concentrically, and are formed to be connected to both ends of the resistor patterns 53, 54 and pass through the annular portion 51. The conductor patterns 55 to 57 reaching the front end of the protruding portion 52 are obtained. The resistor patterns 53 and 54 are formed by, for example, printing and baking a resin paste containing carbon particles, and the conductor patterns 55 to 57 are formed by printing and baking a silver paste to form a front end of each of the conductor patterns 55 to 57. Terminal insertion holes 58 are formed through the substrate 50, and the terminals 6 1 are respectively caulked to the terminal insertion holes 58. In Fig. 6, the caulking portion 61a of the terminal 61 is shown as a shape after the caulking treatment. The substrate 50 is press-fitted into the base 21 of the casing 20 to be received by abutting against the abutting portion 21a provided in the base 21. Thereby, the slider 34 attached to the rotor 40 is pressed against the resistor patterns 53, 54. On the other hand, the ring portion 62 201109679 portion 47 which is formed by projecting the shaft portion 33b on the back side of the plate portion 41 of the rotor 40 is located in the opening 59 of the substrate 50. Further, an outer casing is attached to the opening portion on the back side of the base 21 of the casing 20. The case 6 2 is fixed by heat caulking of the heat caulking portion 21b provided in the base 21 of the casing 20. On the inner surface of the outer casing 62, a bearing hole 62a for supporting the shaft portion 33b formed at the front end of the rotary shaft 33 is formed, and the shaft portion 33b is axially supported by the bearing hole 62a. Around the outer casing 62 attached to the casing 2, as shown in Figs. 5A and 5B, the adhesive 63 is applied and filled, whereby the surface side of the casing 20 is sealed. In this example, a space portion is provided inside the casing 20 at a portion where the terminal 61 is placed, and an adhesive 6 3 is filled around the terminal 61 and around the caulking portion ί as shown in Fig. 5 . . Thereby, the terminal 6 1 is firmly fixed, and the displacement between the terminals 61 can be prevented. In addition, in the case where the terminal 61 is formed by, for example, performing tin plating treatment on carbon steel, the growth of tin-plated tin whiskers can be prevented. Next, the position and the locked state in the casing 20 of the end portions 35a and 35b which are led out in the radial direction of the helical coil spring 35 will be described with reference to Figs. 8A and 8B. 8A and 8B are views showing that the rotating shaft 33 is in the neutral position, and both end portions 35a and 35b of the coil spring 35 elastically contact the circumferential end faces 43a and 43b of the spring guiding portion 43 of the rotor 40, and are in contact with each other. The circumferential end faces 25a and 25b of the spring 25 provided on the inner circumferential surface of the casing 20 are protruded in an arc shape. Both end portions 35a and 35b of the spiral coil spring 35, and both end faces 43a and 43b of the spring guide 43 and both end faces 25a and 25b of the spring seat 25 are formed into a first seat portion 1 a fixed solid seat portion. -12-201109679 is a structure that makes contact in a point contact manner. In this example, the respective ends of the end portions 35a' 35b of the helical coil spring 35 are in point contact with the end faces 25a, 25b of the spring seat 25, between the end face 35a and the end face 25a, and between the end portion 35b and the end face 25b. A wedge-shaped space that expands toward the center of the rotor 40 is formed. On the other hand, the end faces 43a, 43b of the spring guide portion 43 are in point contact with the end portions 35a, 35b of the coil springs 35 at their inner peripheral side corner portions, between the end faces 35a and the end faces 43a, and Between the end portion 3 5 b and the end surface 4 3 b, a wedge-shaped space that expands toward the outer peripheral side of the rotor 40 is formed. The both end faces 43a and 43b of the spring guide portion 43 and the both end faces 25 of the spring seat 25 are formed. a and 2 5 b are formed in a shape in which they are in point contact with the both end portions 35a and 35b of the helical coil spring 35. Therefore, both end portions 35a and 35b of the helical coil spring 35 are easily deflected, and therefore, in a neutral state or the like, Even if the end faces 43a, 43b of the spring guide portion 43 do not coincide with the end faces 25a, 25b of the spring seat 25 due to the dimensional tolerance or the like, the both end portions 3 5 a, 3 5b of the coil spring 35 are not coincident. When the both end portions 35a, 35b of the coil springs 35 are elastically brought into contact with both the spring guide portion 43 and the spring seat 25, the rotor 40 and the rotary shaft 33 can be prevented from rattling. As in this example, a wedge-shaped space is formed between the end portions 35a, 35b of the spiral weir spring 35, and both ends 43a, 43b of the spring guide portion 43 and the spring seat 25 may be provided. The end faces 25a and 25b are provided with a desired inclined portion, that is, an inclined surface, and may be formed, for example, as a curved surface. 9A and 9B are views showing the state in which the rotary shaft 33 is rotated toward the counterclockwise side -13-201109679 and clockwise, and the spring guide portion 43 of the rotor 40, in Fig. 9A, overcomes the spiral coil spring 35. The elasticity is pressed against the end portion 35a, and in the Fig. 9B, the end portion 35b is pressed against the elasticity. The slider 34 is slid on the resistor patterns 53 and 54 of the substrate 50 by the rotation of the rotor 40, and the desired output signal can be obtained from the terminal 61. When the rotational force of the rotary shaft 33 is released, the rotor 40 and the rotary shaft 33 return to the original neutral position shown in Fig. 8A by the elastic restoring force of the helical coil spring 35. As described above, with this example, the sway of the rotary shaft 33 can be prevented at the neutral position. Further, since the coil springs 35 are held by the pair of spring guiding portions 42, 43 circumscribing the rotor 40, the shaft portion of the spring is not inclined, and unintended deformation is not caused, so that good rotation performance can be obtained. This potentiometer is used, for example, for detecting the accelerator acceleration stepping amount of an electric scooter or a quick-passenger. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view of a conventional potentiometer. Fig. 2 is a cross-sectional view showing the stationary state (neutral position) of the potentiometer shown in Fig. 1. Fig. 3 is a cross-sectional view showing the operation state of the potentiometer shown in Fig. 1. Fig. 4A is a perspective view showing an embodiment of the potentiometer of the invention, and Fig. 4B is a front view thereof. Fig. 5A is a cross-sectional view taken along line C-C of Fig. 4B, and Fig. 5B is a cross-sectional view taken along line D-D of Fig. 14-201109679 4B. Fig. 6 is an exploded perspective view of the potentiometer shown in Fig. 4A. Fig. 7 is a view for explaining the mounting of the slider to the rotor. Fig. 8A is a cross-sectional view showing a state in which the rotating shaft is in the neutral position, and Fig. 8B is a partially enlarged view thereof. Fig. 9A is a cross-sectional view showing a state in which the rotation axis is rotated in the counterclockwise direction. Fig. 9B is a cross-sectional view showing a state in which the rotation axis is rotated in the clockwise direction. [Description of main component symbols] 11 : Slide holder 1 2 : Spiral coil spring 13 : Housing 1 4 : Slide 1 5 : Insulating substrate 2 : Housing 21 : Base 22 : Square plate portion 23 : Mounting portion 24 : cylindrical portion 25 : spring seat 3 1 : bearing 32 : sleeve 33 : rotating shaft -15 - 201109679 34 : 35 : 36 : 37 : 38 : 40 : 41 : 4 2 , 44 : 45 : 46 : 47 : 50 : 5 1:52 : 5 3, 55 -5 8 : 59 : 61 : 62 : Sliding member spiral coil spring end seal gasket E-ring rotor plate portion 43 : Spring guide push nut pressing portion Slit guide portion annular portion substrate annular portion projecting portion 54: resistor body pattern 57: conductor pattern terminal insertion hole opening terminal housing 63: adhesive