1342271 九、發明說明： 【發明所屬之技術領域】 : 本案係關於一種液面高度積測裝置’尤指一種適用於 印表機之墨水匣之液面高度偵測裝置。 •【先前技術】 一般而§，喷墨印表機由於具有操作容易且可列印於 夕種喷墨媒體等優點，廣受消費大眾歡迎，已成為個人電 腦設備中必備的產品。 喷墨印表機使用一段時曰後，便會因墨水匣之墨水耗 盡而須更換墨水匣，目前常見之更換方法係丟棄舊有之墨 水匣再安裝全新之墨水匣以提供墨水，此舉不但造成墨水 £體的浪費，且因墨水!£之價格昂貴而無形地增加了使用 者的開銷。為了節省列印成本並避免資源浪費，重複使用 同一個墨水匣的連續供墨系統便因應而生。 • 無論是傳統可更換墨水匣之喷墨印表機，或是可重複 使用同一個墨水g之連續供墨系統中，對於墨水厘内墨水 剩餘量的評估是極為重要的，習知技術中評估墨水匣中墨 水剩餘量的方法有許多種，舉例來說： 以點計數法來計算喷墨頭之喷墨數量，並將嘴墨數量 轉換估算為已使用之墨水量，以評估剩餘之墨水量。 將電極設置於墨水ϋ中，藉由於墨水及電極之間流動 的電流，债測墨水£中之墨水高度是否達到某預定水位。 在墨水匣内侧壁面上設置可透光之稜鏡’當光入射於 1342271 稜鏡上時，光的折射會視墨水水位比稜鏡位置高或低而有 所不同’再依據光線反射之強度偵測墨水是否抵達某預定 问度。 其中’以光學反射原理來偵測墨水匣内的墨水剩餘量 之方法最常被使用’舉例來說，習知檢測墨水匣内液面高 '度的方法可參閱中國專利申請號第99101820.6號，其係揭 露一種利用液體容器不同部分的反射特性來確定該液體 0 容器中墨水高度的喷墨列印系統’該喷墨列印系統1〇〇係 如第一圖所示，包含墨水容器101及墨水高度檢測裝置 102 ’其中’墨水容器101係包含殼體103，殼體ι〇3具有 一内表面103a，且在内表面103a接近墨水容器101底部 的區域設置有一檢測區104，而檢測區104係由複數個第 一受控表面104a以及複數個與第一受控表面l〇4a配對並 與第一受控表面104a成一定角度的第二受控表面i〇4b。 墨水高度檢測裝置102則包含一單一光源106、一單一光 φ 線接收裝置1〇7以及一集光透鏡1〇8。 當來自單一光源106的多條光線109a投射在複數個第 一受控表面104a上，在墨水容器101内的墨水高度i〇5a 高過於檢測區104時，光線l〇9a透過第一受控表面l〇4a 後將折射入墨水105内，其折射後之路徑係如光線l〇9b 所示，而在墨水高度l〇5a低於檢測區104時，光線l〇9a 則在透過第一受控表面l〇4a後直接反射到第二受控表面 104b，再經過第二受控表面1〇4b之反射至集光透鏡1〇8， 再傳送回單一光線接收裝置1〇7内，且其反射之路徑係如 1342271 光線109c所示。最後，再由單一光線接收裝置1〇7根據所 接收反射光線109c的量或是反射光線的強度來判斷墨水 容器101中的墨水高度l05a。 舉例而言，當墨水容器101内的墨水高度1〇5a高於檢 測區104的情況下，第一受控表面1〇4a的所有入射光線 109a都將折射到墨水105中，幾乎沒有光線反射回單一光 線接收裝置107。而當墨水高度i〇5a低於檢測區1〇4時， $ 則會產生最大量或是最大強度的反射光線l〇9c經由集光 透鏡108反射回單一光線接收裝置1〇7，據此以判斷出墨 水容器101内之墨水高度105a。 然而，習知所使用的檢測墨水容器内液面高度的方法 在製作墨水容器1〇1時需在殼體103之内表面l〇3a製作特 定角度之第一受控表面l〇4a及第二受控表面104b，因而 使得墨水容器101的製作過程繁複’另外，由於第一受控 表面104a係具有一特定角度，因而有可能造成部份之墨水 φ 滴殘留於第一受控表面l〇4a上，當此情況發生時’將造成 入射光線109a自單一光源1〇6進入第一受控表面104&時 產生折射，而使得反射進入單一光線接收裝置107之光線 109c的量及強度受到干擾，因而使得墨水高度l〇5a無法 被準確的判斷。 有鑑於此，如何發展〆種可改善上述習知缺點之適用 於印表機之墨水匣之液面高度偵測裝置，實為目前迫切需 要解決之課題。 1342271 【發明内容】 本案之主要目的在於提供一種液面高度偵測裝置，俾 解決習知墨水容器製作過程繁複，且易因殘墨干擾造成墨 水高度無法被準確判斷等缺點。 為達上述目的，本案之一較廣義實施態樣為提供一種 液面高度偵測裝置，適用於印表機，其係包含：墨水匣’ 其係置於印表機内部，且設有儲存墨水之儲墨槽、第一容 置槽，其係具有第一受控壁，且第一受控壁係具有標記， 以及第一容置槽，其係與第一容置槽相對應設置並具有 與第一受控壁相對應對稱設置之第二受控壁；以及感應裝 置組，其係具有發射端及接收端，且發射端係容設於第一 容置槽内，接收端係容設於第二容置槽内。 【貫施方式】 體現本案特徵與優點的一些典型實施例將在後段的 說明中詳細敘述.應理解的是本案能夠在不同的態樣上具 有各種的變化，其皆不脫離本案的範圍，且其中的說明及 圖示在本質上係當作說明之用’而非用以限制本案。 請參閱第二圖A，其係為本案第一較佳實施例之液面 高度偵測裝置之結構示意圖，如圖所示，本實施例之液面 高度偵測裝置2係包含設置於印表機（未圖示）内部之墨水 匠20以及一感應裝置組21，其中，由墨水匡2〇係具有一 殼體2(Π，在殼體201内係為—儲墨肖2〇2，用以儲存墨 水203’並且，於本實施例中，墨水£2〇之殼體2〇1的外 1342271 表面201a向儲墨槽202内凹陷形成兩相對應設置之第一容 置槽204以及第二容置槽205，第一容置槽204係具有一 第一受控壁204a，由於第一容置槽204係凹陷設置於墨水 匣20内，因此第一受控壁204a係設置於墨水匣20之殼體 201的内表面201b，並位於儲墨槽202内，且在第一受控 壁204a上具有一標記204b(如第三圖A及B所示），用以 判斷儲墨槽202内墨水203的剩餘量的基準線，同時，與 第一容置槽204相對應設置之第二容置槽205亦具有一第 • 二受控壁205a，且第二受控壁205a同樣設置於墨水匣20 之儲墨槽202内，並與第一受控壁204a相對應對稱設置， 以及，第一受控壁204a及第二受控壁205a之形態可為但 不限為一中央隆起之尖形結構，另外，第一受控壁204a 及第二受控壁205a係使用可透光之材質所形成，例如：玻 璃或塑膠，但不以此為限。 感應裝置組21則包含一發射端210及一接收端211， φ 於本實施例中，發射端210及接收端211係為一體成形之 裝置，但不以此為限，其亦可依其施作方式而任施變化。 其中，發射端210可具有一光源（未圖示），並透過複數個 電源線212傳遞電源至該發射端210，以使該光源發射一 光線，而接收端211則具有複數個訊號線213，用以傳遞 接收端211所接收到的光線訊號，藉由所收到的光線訊號 來判定墨水203之液面高度。 請參閱第二圖B，其係為第二圖A之組裝示意圖，如 圖所示，當要開始偵測墨水匣20内墨水203之液面高度 1342271 時，需先將感應裝置組21之發射端210容設於墨水匣20 之第一容置槽204内，並將接收端211容設於第二容置槽 205内，當裝設完成後即如第二圖B所示，當發射端210 内之光源發射一束光線3時，光線3係可穿透第一容置槽 • 204之第一受控壁204a，並射入儲墨槽202中，並藉由儲 • 墨槽202中氣体與墨水203之折射率不同，而使光線3在 儲墨槽202中行進後，可抵達第二受控壁205a時產生折射 進入接收端211或是產生全反射而不會傳遞至接收端211 中 〇 請同時參閱第三圖A、B，其係為第二圖B所示之液 面高度偵測裝置之光線路徑俯視示意圖及側視示意圖，如 第三圖A所示，當光線3自發射端210内的光源發射出來 後，首先光線3將穿透設置於第一容置槽204之第一受控 壁204a，並且，光線3射入第一受控壁204a時，係以入 射角S1的角度射入第一受控壁204a之内表面204c，另 φ 外，由於第一受控壁204a之厚度以及材質之影響，將使得 光線3的路徑3A在第一受控壁204a内產生偏移，並以與 第一受控壁204a之外表面204d夾角S2射入儲墨槽202 中，於本實施例中，儲墨槽202内剩餘之墨水203高度係 高於第一受控壁204a上的標記204b(如第三圖B所示）， 因此光線3在進入儲墨槽202後，會受到墨水折射率n2 的影響，而使光線3在墨水203中之行進路徑3B產生偏 移，並以S3之角度射入第二受控壁205a之外表面205d， 同樣地，第二受控壁205a之厚度及材質亦會影響光線3 11 1342271 在第二受控壁205a内之行進路徑3C，因此，當光線3在 穿透過第二受控壁205a後抵達第二受控壁205a之内表面 205c時，其係以S4的角度射入，根據司乃耳定律（Snell’s Law) : nlxSin[Sl]= n2xSin[S2]，因此可推算出 SI、S2、 S3、S4之角度分別如下： S1 =ArcSin[nlxSin[Sl]/n]； S2=ArcSin[nxSin[S]/n2] χ180/ρ ; S3 = (90- S2 ) χρ/180 ； S4=ArcSin[n2xSin[S3]/ nO] xl80/p ； 以本實施例為例，第一受控壁204a及第二受控壁205a 之材質係為塑膠，且氣體係為空氣，故再代入下述條件： 入射角Sl=45° ; 塑膠厚度t=0.8 ; 空氣折射率nl = l ; 塑膠折射率n〇=1.5 ; 水折射率n2=1.33 ; 可獲得S4=48.6745，即光線3在第二受控壁205a中 要進入空氣的入射角係為48.6745°，此時，再根據司乃耳 定律（Snell’s Law)算出由折射率高的塑膠進入折射率低的 空氣之臨界角 S0= ArcSin[nl/ n2] X 180/p=41.8103，由此可 知，S4 > SO，當光線3自折射率高的塑膠進入折射率低 的空氣時入射角S4係大於臨界角S0，因此光線3在此會 如第三圖A所示之路徑3D產生全反射之情形，因而光線 3不會到達設置於第二容置槽205内之接收端211，故在 12 1342271 墨水匣20内之墨水203高度高於標記204b時，意即墨水 203含量充足時，接收端211將不會偵測到任何光線訊號。 請再同時參閱第四圖A、B，其係為第二圖B所示之 液面高度偵測裝置之另一光線路徑俯視示意圖及側視示 • 意圖，如第四圖A所示，當光線4自發射端210内的光源 • 發射出來後，首先將穿透第一受控壁204a，當光線4射入 第一受控壁204a時會因第一受控壁204a的厚度以及材質 之影響，使得光線4於第一受控壁204a内的路徑4A產生 偏移，然而於本實施例中，儲墨槽202内剩餘之墨水203 高度係低於第一受控壁204a上的標記204b(如第四圖B所 示），因此，光線4在穿透第一受控壁204a進入儲墨槽202 後，由於空氣之折射率為1，而使得光線4在儲墨槽202 中可以直線前進，如路徑4B所示，當光線4直線穿透儲 墨槽202後射入第二受控壁205a，同樣地，由於第二受控 壁205a的厚度及材質之影響，亦會使光線4在第二受控壁 φ 205a内之行進路徑4C產生偏移，然而，由於光線4自折 射率高的玻璃進入折射率低的空氣時入射角S5係小於臨 界角S0,因此光線4在此會如第四圖A所示之路徑4D折 射進入第二容置槽205的空氣内，並可被設置於第二容置 槽205内之接收端211所偵測到，簡單來說，當墨水匣20 内之墨水203高度低於標記204b時，即墨水203之剩餘 量低於一預定值時，接收端211將可偵測到一光線訊號， 並產生墨水量不足之警示，以提醒使用者可進行更換墨水 匣20或是補注墨水203之動作。 13 1342271 如此一來’由於第一受控壁204a及第二受控壁205a 均為可透光之光滑表面，因而製作上不需設置特定角度之 反射面或是稜鏡等，使得製作過程更為簡便，並且，本案 之液面高度彳貞測方法係透過詳密估算，因而當墨水203含 •量豐富時，發射端210所發出之光線3在透過儲墨槽202 中之墨水203時將產生全反射之情形，使得接收端211偵 測不到光線訊號，而當墨水203存量低於預定標記204b 處時，則光線4在透過儲墨槽202中之空氣後將產生折 ® 射’使得接收端211偵測到光線訊號，因而產生警示，由 此可見’本案係透過儲墨槽中之介質不同之折射率而產生 全反射或是折射之情形，因而在此偵測過程中不會因為些 許的殘墨而使接收端211偵測到光線訊號而產生誤差。 綜上所述，本案之適用於印表機之墨水匣之液面高度 偵測裝置，主要由墨水匣以及感應裝置組所組成’墨水匣 係具有儲墨槽，感應裝置組係具有發射端及接收端，其係 • 藉由發射端發射光線，光線穿透儲墨槽中之氣體及水兩種 不同介質時折射率不同，使光線抵達第二受控壁後產生全 反射或折射至少其中一種，俾使接收端偵測光線訊號的存 在/、否並發出墨水不足之警示，由於本案之液面高度偵 置之製作過程簡便不繁複’且其液面高度偵測方式亦 a 一準確丨生向。是以，本案之適用於印表機之墨水匣之 液面高度^測裳置極具產業之價值，麦依法提出申請。 德^ ^侍由熟f此技術之人士任施匠思而為諸般修 飾，”、、、自不脫如附申請專利範圍所欲保護者。 丄丄 【圖式簡單說明】 f圖.其係為習知檢測墨水液面高度系統之結構示意 圖。 ^-圖A ·其係為本㈣—較佳實施例之液面高度谓測裝 置之結構示意圖。 圖B .其係為第二圖A所示之組裝示意圖。1342271 IX. Description of the invention: [Technical field to which the invention pertains]: The present invention relates to a liquid level height measuring device, particularly a liquid level detecting device suitable for ink jets of a printer. • [Prior Art] In general, §, the inkjet printer has been widely accepted by consumers because of its advantages of easy operation and printing on the inkjet media. It has become an essential product in personal computer equipment. When the inkjet printer is used for a period of time, it will need to be replaced by the ink cartridge. The current common replacement method is to discard the old ink and install a new ink to provide ink. Not only does it cause waste of ink, but it also invisibly increases the user's overhead due to the high price of ink! In order to save printing costs and avoid waste of resources, the continuous use of the same ink cartridge continuous ink supply system was born. • Whether it is a conventional inkjet printer with replaceable ink cartridges or a continuous ink supply system that can reuse the same ink g, it is extremely important to evaluate the amount of ink remaining in the ink, which is evaluated in the prior art. There are many methods for the amount of ink remaining in the ink cartridge. For example, the number of inkjets of the inkjet head is calculated by dot counting, and the amount of ink in the nozzle is estimated to be the amount of ink used to evaluate the remaining ink amount. . The electrode is placed in the ink cartridge, and the ink height in the debt test ink reaches a predetermined water level due to the current flowing between the ink and the electrode. On the inner side wall surface of the ink cartridge, a light-transmissive 稜鏡' is set. When the light is incident on the 1,342,271 稜鏡, the refraction of the light will be different depending on whether the ink level is higher or lower than the 稜鏡 position, and then the intensity of the light reflection is detected. Test if the ink reaches a predetermined degree. The method of detecting the remaining amount of ink in the ink cartridge by the principle of optical reflection is most commonly used. For example, a conventional method for detecting the liquid level in the ink cartridge can be referred to Chinese Patent Application No. 99101820.6. It discloses an ink jet printing system that utilizes the reflective characteristics of different portions of a liquid container to determine the ink level in the liquid 0 container. The ink jet printing system 1 is as shown in the first figure, and includes an ink container 101 and The ink level detecting device 102' wherein the ink container 101 includes a casing 103 having an inner surface 103a, and a detecting area 104 is disposed in an area of the inner surface 103a near the bottom of the ink container 101, and the detecting area 104 A plurality of first controlled surfaces 104a and a plurality of second controlled surfaces i〇4b paired with the first controlled surface 104a and at an angle to the first controlled surface 104a. The ink level detecting device 102 includes a single light source 106, a single light φ line receiving device 1〇7, and a collecting lens 1〇8. When a plurality of light rays 109a from a single light source 106 are projected on the plurality of first controlled surfaces 104a, when the ink height i〇5a in the ink container 101 is higher than the detection area 104, the light rays l〇9a pass through the first controlled surface. After 〇4a, it will be refracted into the ink 105. The path after refraction is as shown by the light l〇9b, and when the ink height l〇5a is lower than the detection area 104, the light l〇9a is transmitted through the first control. After the surface l〇4a is directly reflected to the second controlled surface 104b, and then reflected by the second controlled surface 1〇4b to the collecting lens 1〇8, and then transmitted back to the single light receiving device 1〇7, and the reflection thereof The path is as shown by the 1342271 light 109c. Finally, the ink height l05a in the ink container 101 is judged by the single light receiving means 1 to 7 based on the amount of the received reflected light 109c or the intensity of the reflected light. For example, when the ink height 1〇5a in the ink container 101 is higher than the detection area 104, all incident light rays 109a of the first controlled surface 1〇4a will be refracted into the ink 105, and almost no light is reflected back. A single light receiving device 107. When the ink height i 〇 5a is lower than the detection area 1 〇 4, the maximum amount or maximum intensity of the reflected light 〇 9 c is reflected back to the single light receiving device 1 〇 7 via the collecting lens 108, thereby The ink height 105a in the ink container 101 is judged. However, the conventional method for detecting the liquid level in the ink container used in the ink container 1〇1 requires the first controlled surface l〇4a and the second at a specific angle on the inner surface 10a of the casing 103. The controlled surface 104b thus complicates the manufacturing process of the ink container 101. In addition, since the first controlled surface 104a has a specific angle, it is possible that a portion of the ink φ drops remain on the first controlled surface 10a Above, when this happens, 'will cause the incident light 109a to refract from the single source 1 〇 6 into the first controlled surface 104 & such that the amount and intensity of the light 109c reflected into the single light receiving device 107 is disturbed, Therefore, the ink height l〇5a cannot be accurately judged. In view of this, how to develop a liquid level detecting device suitable for the ink jet of a printer can improve the above-mentioned conventional disadvantages, which is an urgent problem to be solved. 1342271 [Summary of the Invention] The main purpose of the present invention is to provide a liquid level detecting device, which solves the defects of the complicated manufacturing process of the ink container and the fact that the ink height cannot be accurately judged due to residual ink interference. In order to achieve the above object, a broader aspect of the present invention provides a liquid level detecting device suitable for use in a printer, which comprises: an ink cartridge which is placed inside the printer and is provided with a storage ink. The ink storage tank, the first accommodating groove has a first controlled wall, and the first controlled wall has a mark, and the first accommodating groove is disposed corresponding to the first accommodating groove and has a second controlled wall symmetrically disposed corresponding to the first controlled wall; and a sensing device set having a transmitting end and a receiving end, wherein the transmitting end is received in the first receiving slot, and the receiving end is received In the second receiving groove. [CROSS MODE] Some typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different aspects without departing from the scope of the present invention. The descriptions and illustrations are used in the nature of the description rather than to limit the case. Please refer to FIG. 2A , which is a schematic structural diagram of a liquid level detecting device according to a first preferred embodiment of the present invention. As shown in the figure, the liquid level detecting device 2 of the present embodiment includes a setting on a printing table. An inker 20 and a sensing device group 21 inside the machine (not shown), wherein the ink cartridge 2 has a casing 2 (Π, in the casing 201 is a storage ink 2 2, for use) In order to store the ink 203', and in the present embodiment, the outer surface 1242271 of the housing 2〇1 of the ink is recessed into the ink reservoir 202 to form two corresponding first receiving grooves 204 and second. The first receiving wall 204 has a first controlled wall 204a. Since the first receiving groove 204 is recessed in the ink cartridge 20, the first controlled wall 204a is disposed on the ink cartridge 20. The inner surface 201b of the housing 201 is located in the ink reservoir 202 and has a mark 204b on the first controlled wall 204a (as shown in the third FIGS. A and B) for determining the ink reservoir 202. The reference line of the remaining amount of the ink 203, and the second accommodating groove 205 disposed corresponding to the first accommodating groove 204 also has a The controlled wall 205a, and the second controlled wall 205a is also disposed in the ink reservoir 202 of the ink cartridge 20, and symmetrically disposed corresponding to the first controlled wall 204a, and the first controlled wall 204a and the second controlled The shape of the control wall 205a may be, but is not limited to, a centrally raised pointed structure. In addition, the first controlled wall 204a and the second controlled wall 205a are formed by using a light transmissive material, such as glass or plastic. However, the sensing device group 21 includes a transmitting end 210 and a receiving end 211. In this embodiment, the transmitting end 210 and the receiving end 211 are integrally formed, but not limited thereto. The transmitting end 210 can have a light source (not shown) and transmit power to the transmitting end 210 through a plurality of power lines 212 to cause the light source to emit a light source. The receiving end 211 has a plurality of signal lines 213 for transmitting the light signals received by the receiving end 211, and determining the liquid level of the ink 203 by the received light signals. , which is the assembly diagram of the second figure A, as shown in the figure When the liquid level of the ink 203 in the ink cartridge 20 is to be detected, the emitter end 210 of the sensing device group 21 is firstly accommodated in the first receiving groove 204 of the ink cartridge 20, and the receiving end 211 is received. It is disposed in the second accommodating groove 205. When the installation is completed, as shown in FIG. 2B, when the light source in the transmitting end 210 emits a light beam 3, the light 3 can penetrate the first accommodating groove. • The first controlled wall 204a of 204 is incident on the ink reservoir 202, and after the light 3 is traveling in the ink reservoir 202 by the difference in refractive index between the gas and the ink 203 in the ink reservoir 202, When the second controlled wall 205a is reached, it can be refracted into the receiving end 211 or can be totally reflected without being transmitted to the receiving end 211. Please also refer to the third figure A, B, which is shown in the second figure B. A schematic plan view and a side view of the light path of the liquid level detecting device, as shown in FIG. 3A, when the light 3 is emitted from the light source in the emitting end 210, the light 3 is first penetrated and disposed in the first receiving position. The first controlled wall 204a of the slot 204, and when the light 3 enters the first controlled wall 204a, is incident at an angle S1 Injecting into the inner surface 204c of the first controlled wall 204a, outside the φ, due to the thickness of the first controlled wall 204a and the material, the path 3A of the light 3 will be offset within the first controlled wall 204a. And entering the ink reservoir 202 at an angle S2 to the outer surface 204d of the first controlled wall 204a. In this embodiment, the ink 203 remaining in the ink reservoir 202 is higher in height than the first controlled wall 204a. The mark 204b (as shown in the third figure B), so that after entering the ink reservoir 202, the light 3 is affected by the refractive index n2 of the ink, and the light path 3 is shifted in the traveling path 3B in the ink 203, and The second controlled wall 205a is exposed to the outer surface 205d at an angle of S3. Similarly, the thickness and material of the second controlled wall 205a also affect the traveling path 3C of the light 3 11 1342271 in the second controlled wall 205a. Therefore, when the light 3 reaches the inner surface 205c of the second controlled wall 205a after penetrating through the second controlled wall 205a, it is incident at an angle of S4, according to Snell's Law: nlxSin[Sl ]= n2xSin[S2], so the angles of SI, S2, S3, and S4 can be derived as follows: S1 = ArcSin[nlxSi n[Sl]/n]; S2=ArcSin[nxSin[S]/n2] χ180/ρ ; S3 = (90- S2 ) χρ/180 ; S4=ArcSin[n2xSin[S3]/ nO] xl80/p ; In this embodiment, for example, the materials of the first controlled wall 204a and the second controlled wall 205a are plastic, and the gas system is air, so the following conditions are substituted: the incident angle S1=45°; the plastic thickness t=0.8 ; air refractive index nl = l; plastic refractive index n 〇 = 1.5; water refractive index n2 = 1.33; S4 = 48.6745 can be obtained, that is, the incident angle of light 3 entering the air in the second controlled wall 205a is 48.6745 ° At this time, according to Snell's Law, the critical angle of the air with a high refractive index into the air with a low refractive index is calculated as S0 = ArcSin[nl/n2] X 180/p=41.8103, which shows that S4 > SO, when the light 3 enters the low refractive index air from the high refractive index plastic, the incident angle S4 is greater than the critical angle S0, so the light 3 will be totally reflected as shown in the third path A3. Therefore, the light 3 does not reach the receiving end 211 disposed in the second receiving groove 205. Therefore, when the ink 203 in the ink cartridge 20 is higher than the mark 204b in 12 1342271, the ink 203 is included. Is sufficient, the receiver 211 does not detect any light signal. Please refer to FIG. 4A and B at the same time, which is a top view and a side view of another light path of the liquid level detecting device shown in FIG. B, as shown in FIG. 4A. The light source 4 from the light source in the emitting end 210, after being emitted, will first penetrate the first controlled wall 204a, and when the light 4 is incident on the first controlled wall 204a, the thickness of the first controlled wall 204a and the material will be The effect is that the path 4A of the light 4 in the first controlled wall 204a is offset. However, in the present embodiment, the ink 203 remaining in the ink reservoir 202 is lower in height than the mark 204b on the first controlled wall 204a. (As shown in FIG. 4B), therefore, after the light 4 penetrates the first controlled wall 204a and enters the ink reservoir 202, the light 4 can be straight in the ink reservoir 202 due to the refractive index of the air being 1. Advancing, as shown by path 4B, when the light 4 passes straight through the ink reservoir 202 and enters the second controlled wall 205a, likewise, due to the thickness and material of the second controlled wall 205a, the light 4 is also caused. The travel path 4C in the second controlled wall φ 205a is offset, however, since the light 4 has a high refractive index When the glass enters the air with low refractive index, the incident angle S5 is smaller than the critical angle S0, so the light 4 is refracted into the air of the second accommodating groove 205 as shown in the path 4D shown in FIG. The receiving end 211 in the second accommodating groove 205 detects, in short, when the ink 203 in the ink cartridge 20 is lower than the mark 204b, that is, the remaining amount of the ink 203 is lower than a predetermined value, the receiving end The 211 will detect a light signal and generate a warning of insufficient ink level to remind the user to perform the action of replacing the ink cartridge 20 or refilling the ink 203. 13 1342271 In this way, since the first controlled wall 204a and the second controlled wall 205a are all permeable smooth surfaces, it is not necessary to provide a specific angle of reflection surface or the like, so that the manufacturing process is more For the sake of simplicity, and the method for measuring the level of the liquid level in the present case is through detailed estimation, when the ink 203 is rich in content, the light 3 emitted from the emitting end 210 will pass through the ink 203 in the ink storage tank 202. In the case of total reflection, the receiving end 211 does not detect the light signal, and when the ink 203 is stored below the predetermined mark 204b, the light 4 will be deflected after passing through the air in the ink storage tank 202. The receiving end 211 detects the light signal, thereby generating a warning, so that it can be seen that the present case is totally reflected or refracted by the different refractive index of the medium in the ink storage tank, so that it is not caused during the detection process. A small amount of residual ink causes the receiving end 211 to detect the light signal and generate an error. In summary, the liquid level detecting device for ink jets of the printer is mainly composed of an ink cartridge and an inductive device group. The ink cartridge has an ink reservoir, and the sensing device has a transmitting end and The receiving end, which emits light through the emitting end, and the light has a different refractive index when it penetrates the gas and water in the ink reservoir, so that the light reaches the second controlled wall and generates at least one of total reflection or refraction.俾 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 接收 侦测 接收 侦测 侦测 接收 接收to. Therefore, the liquid level of the ink cartridge applicable to the printer in this case is very valuable in the industry. De ^ ^ 侍 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟 熟Schematic diagram of the structure for detecting the liquid level of the ink is known. ^-Fig. A is a schematic diagram of the structure of the liquid level height measuring device of the preferred embodiment. Fig. B is the second drawing A Show the assembly diagram.
【：圖A:其係為第二圖B所示之液面高度娜置之光 線路徑俯視示意圖。 :三圖B:其係為第三圖A所示之側視示意圖。 ::A.其係為第二圖㈣示之液面高度偵測裝置之另 一光線路徑俯視示意圖。 第四圖其係為第四圖八所示之側視示意圖。 1342271 【主要元件符號說明】 100:喷墨列印系統 101 :墨水容器 102 :墨水高度檢測裝置 103、201 :殼體 • 103a、201b、204c、205c :内表面 104 ·檢測區 104a :第一受控表面 ® 104b :第二受控表面 105、203 :墨水 105a .墨水南度 106 :單一光源 107 :單一光線接收裝置 108 :集光透鏡 109a、109b、109c、3、4 :光線 φ 2:液面高度偵測裝置 20 :墨水匣 201a、204d、205d :外表面 202 :儲墨槽 204 :第一容置槽 204a :第一受控壁 204b :標記 205 :第二容置槽 205a :第二受控壁 1342271 21 :感應裝置組 210 :發射端 211 :接收端 212 :電源線 213 :訊號線 SO、SI、S2、S3、S4 :角度 η、n0、nl、n2 :折射率 t =厚度 3A、3B、3C、3D、4B、4D :光線路徑[: Figure A: This is a schematic plan view of the light path of the liquid level shown in Figure B. : Figure B: This is a side view of the third Figure A. ::A. It is a top view of another light path of the liquid level detecting device shown in the second figure (4). The fourth figure is a side view showing the fourth figure eight. 1342271 [Description of main component symbols] 100: Inkjet printing system 101: Ink container 102: Ink height detecting device 103, 201: Housing • 103a, 201b, 204c, 205c: Inner surface 104 • Detection area 104a: First subject Control surface® 104b: second controlled surface 105, 203: ink 105a. ink south 106: single light source 107: single light receiving device 108: collecting lens 109a, 109b, 109c, 3, 4: light φ 2: liquid Surface height detecting device 20: ink cartridge 201a, 204d, 205d: outer surface 202: ink tank 204: first receiving groove 204a: first controlled wall 204b: mark 205: second receiving groove 205a: second Controlled wall 1342271 21: Inductive device group 210: Transmitting end 211: Receiving end 212: Power line 213: Signal line SO, SI, S2, S3, S4: Angle η, n0, nl, n2: Refractive index t = thickness 3A , 3B, 3C, 3D, 4B, 4D: ray path
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