200932536 九、發明說明 【發明所屬之技術領域】 本發明係有關於噴墨列印的領域，特別是具有頁寬式 列印頭的噴墨印表機。 【先前技術】 本申請人曾經開發出一系列使用頁寬式列印頭來取代 傳統往復式列印頭設計的印表機。頁寬式設計可增進列印 速度，因爲列印頭無需來回橫跨過頁面移動，以堆積出％ 行的影像。頁寬式列印頭僅是在高速通過介質時，將墨水 堆積於介質上。此種列印頭能夠以每分鐘60頁左右的速 度進行1 600dpi的全彩列印，此速度是先前無法以習用噴 墨印表機來加以達成的。 這樣的高解析度及列印速度主要是因爲列印頭的自@ 冷卻作業。過量的熱不會蓄積在噴嘴內，因爲熱會隨著噴 出的墨水液滴而排出。這可讓噴嘴能夠更靠近在一起，而 噴嘴的發射速率將只會受到墨水塡充速率的限制。這種的 自我冷卻作業是依賴低的噴射能量，而此噴射能量則是對 應於小噴嘴及低液滴體積。另一個有助於低能量噴射的因 素是短的噴嘴孔口長度。這些噴嘴形成一種幾何形狀（通 常是圓形或橢圓形）’而孔口長度則用以構成噴嘴之結構 體（例如噴嘴板）的厚度。長的噴嘴孔口長度在墨水液滴 經由噴嘴噴出時，會具有較高的流體拖曳力。本申請人的 列印頭設計可使噴嘴孔口長度保持相當的短（小於5微米 200932536 小的噴嘴容易堵塞住，而紙碎屑或噴嘴表面（構成噴 嘴孔口陣列的外表面）上乾掉的墨水均會在緊鄰分隔開的 不同顏色噴嘴間造成顔色的混合。紙碎屑及其他的污染物 可以透過刮刷噴嘴表面來加以去除掉。但是，刮刷器的壓 力對於達成有效清潔作用是相當重要的。不幸的是，達成 有效清潔作用所需的壓力卻會損傷列印頭積體電路的精密 ❹ 結構。 【發明內容】 因此，本發明提供一種噴墨印表機的列印頭總成，該 列印頭總成包含有： 一長形列印頭積體電路，具有一噴嘴表面，形成一個 陣列的噴嘴； 一支撐結構，用以支撐該長形列印頭積體電路於一外 表面上，以使得其長度垂直於通過該印表機的介質進給方 向；其中， 該外表面係組構成使其具有一個平齊於該長形列印頭 積體電路之一長側邊緣的區段。 本發明係將列印頭積體電路安裝成能將刮刷表面導引 至噴嘴表面上，而不是碰撞至設置成高出安裝表面之列印 頭積體電路的側邊。這可讓刮刷器有效地清潔噴嘴表面’ 而無需使用到會損傷精細噴嘴結構的接觸壓力。本申請人 的硏究發現到，將列印頭積體電路安裝成使其設置成高出 -6- 200932536 該外表面，會使刮刷器需 噴嘴表面。但是，該力量 首先接觸到刮刷器的邊緣 反彈離開列印頭積體電路 數次。因此，刮刷器在數 而無法清除掉污染物。 最好，該列印頭總成 I 以末端連接末端的方式固 Ο 印頭總成在使用上是一種 體電路的長側邊緣是互相 環氧樹脂，鄰接於該等列 氧樹脂是建構成使其平齊 面。最好，該等列印頭積 著部，沿著與鄰接環氧樹 緣設置。最好，該環氧樹 Q 該等導線接著部係包覆於 呈現出一自該噴嘴表面向 面是平坦的。在一更佳的 術沉積出來的二氧化矽。 影術沉積出來的氮化矽。 列印頭匣盒，以供使用者 下面將配合所附圖式 要高的接觸壓力，以供其能清潔 會損傷列印頭積體電路，特別是 。減低接觸力量會使得刮刷器片 的該邊緣，並在噴嘴表面上反彈 個點處將無法接觸到噴嘴表面， 具有多個長形列印頭積體電路， 定於該支撐結構上，而使得該列 頁寬式列印頭，而每一列印頭積 對齊。最好，該支撐結構具有一 印頭積體電路的長側邊緣，該環 於該等列印頭積體電路的噴嘴表 體電路每一者均具有一列導線接 脂之長側邊緣相對的尾端長側邊 脂在固化前係觸變性的。最好， 一密封劑內，該密封劑係建構成 上傾斜的表面。最好，該噴嘴表 實施例中，該噴嘴表面是以微影 選用上，該噴嘴表面可以是以微 最好，該列印頭總成是設置成一 插入或自一表印表內拆卸下來。 ，以舉例方式來說明本發明的較 佳實施例。 200932536 【實施方式】 第1圖顯示出一列印頭匣盒2裝設於一列印引擎3內 。列印引擎3是一印表機的機械核心，其可具有多種不同 的外殻形狀、墨水槽位置及容量，以及不同的介質進給及 收集盤。列印頭匣盒2是可由使用者拉起或壓下閂件126 而加以插入或拆下。列印引擎3形成有與列印頭匣盒2上 之接點接觸的電性連接部，以及一流體管接頭經由插座 120及入口及出口歧管48及50而形成。第2圖顯示出拆 除列印頭匣盒後的列印引擎3，顯露出每一插座120內的 孔口 122。每一孔口 122均可容受入口及出口歧管上的每 一管嘴52。如前面所討論的，這些墨水槽可具有任意的位 置及構造，但要連接至位在插座120後方的中空插口 124 上。 第3圖是完整列印頭匣盒2的外觀圖。此列印頭匣盒 2具有一頂部模製件44及一可拆卸保護蓋42。頂部模製 件44具有一中央腹板，用做結構補強及提供抓持用紋路 狀表面58，以供插入及拆卸時操持此匣盒之用。保護蓋 42的基部部位可在安裝於印表機內之前保護列印頭積體電 路（未顯示）及接點（未顯示）列。帽蓋56係與該基部 部位一體成型，可遮蓋住墨水入口及出口（見第5圖中的 54 及 52)。 第4圖顯示出保護蓋42拆除後的列印頭總成2，以供 顯露出底部表面上的列印頭積體電路及側邊表面上的該列 接點33。此保護蓋可加以棄置而做爲回收之廢棄物，或是 -8- 200932536 套置於更換下來的列印頭匣盒上，以容受漏洩的殘餘墨水 。第5圖是列印頭總成2的部份分解外觀圖。頂蓋44係 已拆除掉，以顯露出入口歧管48及出口歧管50。入口及 出口管套46及47係已先移除，以供更清楚地顯露出該等 五個入口及出口管嘴52。入口及出口歧管48及50在每一 個別之入口及出口與LCP模製件內之相對應的主要通道間 均形成一流體連接部。此主要通道係延伸於該LCP模製件 的長度，且其可對一系列位於該LCP模製件底側的細微通 道加以進料。一列的空氣孔穴形成於該等主要通道24之 每一者的上方。墨水內的任何陡震波或壓力脈波均可藉由 該等空氣孔穴之空氣的壓縮來加以消減掉。 第6圖是未設置入口或出口歧管或頂蓋模製件時的列 印頭總成的分解外觀圖。每一種墨水顏色的主要通道24 及他們相關的空氣孔穴26均是分別形成於通道模製件68 及孔穴模製件72內。黏附至通道模製件68底部上的是一 晶片接著膜66。此晶片接著膜66可將列印頭積體電路31 固定在通道模製件上，以使得位在通道模製件68底側的 細微通道能經由貫穿過該膜的小型雷射切割孔洞而與列印 頭積體電路3 1做流體連通。 通道模製件68及頂蓋模製件72二者均是由LCP (液 晶聚合物）模製而成，這是基於其剛性及熱膨脹係數是非 常緊密地配合於矽。可以瞭解到，諸如頁寬式列印頭之類 的極長結構體必須要將列印頭積體電路31的矽基材與其 他們的支撐結構間的任何熱膨脹差減至最小。 -9- 200932536 第7A圖及第7B圖是列印頭總成被由列印引擎3之列 印頭維修設備所驅動之刮刷器片加以清潔時的部份剖面圖 。有關於列印頭維修設備的操作在本申請人所有之審查中 美國專利申請案，本人檔案編號RRE016US，中有詳細的 說明’其內容係引用於本文內以供參考。第7A圖內顯示 出設有空氣孔穴26的孔穴模製件72、用以構成主要通道 24的通道模製件68。一晶片接著膜66黏附至通道模製件 0 68的底側’而列印頭積體電路3丨則以末端連接末端的方 式固定住而延伸於列印介質的寬度。一紙導件1 4 0附著至 LCP模製件68及72的前側。此可在列印過程中在噴嘴與 介質基材間形成間隙。 在晶片接著膜66上施用上一層環氧樹脂130。此樹脂 層1 3 0會在刮刷器片1 3 8移動通過列印頭總成外表面時接 觸之。樹脂層1 30的厚度是控制成使其與列印頭積體電路 31的噴嘴表面平齊。這基本上可塡塞住由列印頭積體電路 φ 3 1之側邊所造成的台階部。藉由樹脂層1 3 0導引刮刷器片 1 3 8至噴嘴表面上，列印頭積體電路的前側邊緣將可被遮 蓋起來’免於與刮刷器的硬碰撞。因此，列印頭積體電路 3 1將較不會受損及磨損，而刮刷器也可以僅使用適度的接 觸力即可達成有效的清潔。碰撞到噴嘴表面的前側邊緣會 使刮刷器片反彈，而失去與列印頭積體電路間的接觸。 列印頭積體電路係製做成使噴嘴表面做平坦化處理。 平直的噴嘴表面較易於清潔，因爲灰塵及污染物較不易於 固著而無法自噴嘴開孔分離開。此過程在本申請人之審查 -10- 200932536 中的美國專利申請序號1 1/877667號（本人檔案編號 MPN0 13US )內有詳細的說明，其內容係引用於此以供參 考。簡單地說’迨些噴嘴結構具有一層光阻劑沉積於其等 之上’而後再被密封於氧化矽或氮化矽的噴嘴表面層下方 。此一相當堅硬的氮化矽或氧化矽具有較噴嘴表面由聚合 物抗蝕材料製成之列印頭積體電路爲佳的磨損抗力。 第7 B圖顯示出刮刷器片1 3 8位於列印頭積體電路3 j 的尾端邊緣處。此刮刷器會將灰塵及污染物的小球〗3 6推 壓於其前方。設在此尾端邊緣處的是一團密封劑材料132 。此密封劑1 3 2包覆著用來將電力及列印資料傳送至列印 頭積體電路31的導線接著部（未顯示）。這些電力及資 料是由列印引擎控制器（未顯示）加以餵送至設在撓性印 刷電路板1 44之邊緣上的一列接點1 42。撓性印刷電路板 144環繞著列印頭總成底側上的一下凹表面146。將撓性 印刷電路板相對於列印頭積體電路下凹可降低導線接著部 環圈的高度，因此可以讓密封劑團132降低些。本申請人 係藉由將密封劑團132建構成爲具有一自列印頭積體電路 之噴嘴表面向上傾斜的傾斜表面1 3 4而得以利用此優點。 此傾斜表面1 3 4可穩固地將污染物球1 3 6推壓至刮刷器 1 3 8上。當刮刷器1 3 8最後自該外表面上離開時，該污染 物球1 3 6將較不容易留存列印頭上。 爲方便起見，密封劑132及環氧樹脂層130可以是相 同的聚合物材。此聚合物材料必須是觸變性的；亦即其不 可以在自身的重量作用下流動。以此方式，密封劑132及 -11 - 200932536 塡塞用環氧樹脂130可以正確地建構及成型，而不會有材 料流動成爲不同形狀的風險。 【圖式簡單說明】 第1圖顯示出本發明的列印頭匣盒裝設於一印表機的 列印引擎內。 第2圖顯示出列印引擎沒有裝設列印頭匣盒，以顯露 出入口及出口墨水管接頭。 第3圖是根據本發明的完整列印頭匣盒的外觀圖。 第4圖顯示出第3圖中之列印頭匣盒拆除保護蓋後的 情形。 第5圖是第3圖之列印頭匣盒內之列印頭總成的部份 分解外觀圖。 第6圖是未設置入口或出口歧管或頂蓋模製件的列印 頭總成的分解外觀圖。 第7A圖及第7B圖是以刮刷器片清潔噴嘴表面的列印 頭總成的部份剖面圖。 【主要元件符號說明】 2 :列印頭總成 3 :列印引擎 24 :主要通道 26 :空氣孔穴 3 1 :列印頭積體電路 -12- 200932536 3 3 :接點 42 :保護蓋 44 :頂部模製件 46 :入口管套 47 :出口管套 4 8 :入口歧管BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of ink jet printing, and more particularly to an ink jet printer having a pagewidth print head. [Prior Art] The Applicant has developed a series of printers that use a page-wide printhead to replace the conventional reciprocating printhead design. The page-wide design increases print speed because the printhead does not have to move back and forth across the page to accumulate % of the image. The page-wide printhead simply deposits ink on the media as it passes through the media at high speed. This type of print head is capable of full-color printing at 1 600 dpi at a speed of about 60 pages per minute, which was previously not possible with conventional inkjet printers. This high resolution and printing speed is mainly due to the @cooling operation of the print head. Excess heat does not accumulate in the nozzle because heat is expelled with the ejected ink droplets. This allows the nozzles to be closer together, and the nozzle's rate of emission will only be limited by the ink charge rate. This self-cooling operation relies on low jet energy, which corresponds to small nozzles and low droplet volumes. Another factor contributing to low energy injection is the short nozzle orifice length. These nozzles form a geometric shape (usually circular or elliptical) and the length of the orifice is used to form the thickness of the structure of the nozzle (e.g., the nozzle plate). The long nozzle orifice length will have a higher fluid drag force as the ink droplets are ejected through the nozzle. The Applicant's print head design allows the nozzle orifice length to be kept relatively short (no less than 5 microns, 200932536 small nozzles are easily blocked, and paper debris or nozzle surfaces (constituting the outer surface of the nozzle orifice array) are dried. Ink will cause color mixing between adjacent nozzles of different colors. Paper debris and other contaminants can be removed by wiping the nozzle surface. However, the pressure of the wiper is effective for cleaning. It is quite important that, unfortunately, the pressure required to achieve an effective cleaning action can damage the precision structure of the print head integrated circuit. [Invention] Accordingly, the present invention provides a print head of an ink jet printer. The print head assembly comprises: an elongated print head integrated circuit having a nozzle surface to form an array of nozzles; a support structure for supporting the elongated print head integrated circuit On the outer surface such that its length is perpendicular to the direction of media feed through the printer; wherein the outer surface is configured such that it has a flush print to the elongate print A segment of one of the long side edges of the integrated circuit. The present invention mounts the printhead integrated circuit to direct the wiper surface onto the nozzle surface rather than colliding with a printhead disposed above the mounting surface The side of the integrated circuit. This allows the wiper to effectively clean the nozzle surface' without the use of contact pressure that would damage the fine nozzle structure. Applicants' research has found that the print head integrated circuit is mounted Setting it to a height above -6-200932536 will cause the wiper to require a nozzle surface. However, the force first comes into contact with the edge of the wiper and bounces off the printhead integrated circuit several times. Therefore, the wiper The number of the device is too large to remove the contaminant. Preferably, the print head assembly I is fixed at the end of the end. The print head assembly is a long side edge of the body circuit which is epoxy resin, adjacent to each other. Preferably, the printheads are disposed along the edge of the adjacent epoxy tree. Preferably, the epoxy tree Q is followed by the wire. Wrapped in a nozzle The face-to-face is flat. The cerium oxide deposited in a better process. The tantalum nitride deposited by the shadow film. The print head 匣 box is used for the user to have a high contact pressure under the drawing. , in order to be able to clean it will damage the print head integrated circuit, in particular. Reduce the contact force will make the edge of the wiper sheet, and rebound on the nozzle surface will not be able to touch the nozzle surface, with multiple An elongated print head integrated circuit is disposed on the support structure such that the column is of a wide print head and each print head is aligned. Preferably, the support structure has a length of a print head integrated circuit. a side edge, the ring body of each of the nozzle body circuits of the print head integrated circuits each having a long side edge of a row of wire bonds opposite the long side edge of the fat is tactile prior to curing. In a sealant, the sealant is constructed to form an upwardly inclined surface. Preferably, in the nozzle embodiment, the nozzle surface is selected for lithography, and the nozzle surface may be preferably micro-sized, the print head assembly being disposed to be inserted or detached from a surface. The preferred embodiment of the invention is illustrated by way of example. 200932536 [Embodiment] FIG. 1 shows a row of print cartridges 2 mounted in a printing engine 3. The print engine 3 is the mechanical core of a printer that can have a variety of different housing shapes, ink tank positions and capacities, as well as different media feed and collection trays. The print head cartridge 2 can be inserted or removed by the user pulling up or pressing the latch 126. The print engine 3 is formed with an electrical connection in contact with the contacts on the printhead cassette 2, and a fluid pipe joint is formed via the receptacle 120 and the inlet and outlet manifolds 48 and 50. Figure 2 shows the print engine 3 after the print head cartridge has been removed, revealing the aperture 122 in each receptacle 120. Each orifice 122 can accommodate each nozzle 52 on the inlet and outlet manifolds. As previously discussed, these ink reservoirs can have any position and configuration but are attached to a hollow socket 124 located behind the receptacle 120. Figure 3 is an external view of the complete print head cartridge 2. The print head cartridge 2 has a top molding member 44 and a detachable protective cover 42. The top molding 44 has a central web for structural reinforcement and a gripping textured surface 58 for handling the cassette during insertion and removal. The base portion of the protective cover 42 protects the print head integrated circuit (not shown) and the contacts (not shown) before being mounted in the printer. The cap 56 is integrally formed with the base portion to cover the ink inlet and outlet (see 54 and 52 in Fig. 5). Figure 4 shows the printhead assembly 2 with the protective cover 42 removed to reveal the printhead integrated circuit on the bottom surface and the row of contacts 33 on the side surfaces. The protective cover can be disposed of as waste for recycling, or -8-200932536 can be placed on the replaced print head cartridge to contain residual residual ink. Figure 5 is a partial exploded view of the print head assembly 2. The top cover 44 has been removed to reveal the inlet manifold 48 and the outlet manifold 50. The inlet and outlet sleeves 46 and 47 have been removed first to more clearly reveal the five inlet and outlet nozzles 52. Inlet and outlet manifolds 48 and 50 form a fluid connection between each of the individual inlets and outlets and the corresponding primary passages in the LCP molding. The primary passage extends over the length of the LCP molding and is capable of feeding a series of fine passages located on the underside of the LCP molding. A column of air holes are formed above each of the main passages 24. Any steep or pressure pulse waves in the ink can be attenuated by the compression of the air in the air holes. Figure 6 is an exploded perspective view of the print head assembly without an inlet or outlet manifold or cap molding. The primary passages 24 of each ink color and their associated air pockets 26 are formed in the channel molding 68 and the cavity molding 72, respectively. Adhered to the bottom of the channel molding 68 is a wafer follower film 66. The wafer follower film 66 can secure the printhead integrated circuit 31 to the channel molding such that the fine channels located on the bottom side of the channel molding 68 can be cut through small laser cutting holes through the film. The print head integrated circuit 3 1 is in fluid communication. Both the channel molding 68 and the cap molding 72 are molded from LCP (liquid crystal polymer) based on the rigidity and coefficient of thermal expansion which are closely fitted to the crucible. It will be appreciated that very long structures such as pagewidth printheads must minimize any thermal expansion differences between the tantalum substrate of the printhead integrated circuit 31 and their support structures. -9- 200932536 Sections 7A and 7B are partial cross-sectional views of the printhead assembly being cleaned by a wiper blade driven by the printhead maintenance equipment of the print engine 3. The operation of the printhead repairing apparatus is described in the Applicant's U.S. Patent Application Serial No. RRE 016 US, the entire disclosure of which is incorporated herein by reference. The hole molding member 72 provided with the air holes 26 and the channel molding member 68 for constituting the main passage 24 are shown in Fig. 7A. A wafer is then adhered to the bottom side of the channel molding member 68 and the print head assembly circuit 3 is held in the manner of the end attachment end to extend across the width of the printing medium. A paper guide 140 is attached to the front side of the LCP moldings 68 and 72. This creates a gap between the nozzle and the media substrate during the printing process. An upper layer of epoxy resin 130 is applied over the wafer follower film 66. This resin layer 130 will contact the wiper sheet 138 as it moves past the outer surface of the printhead assembly. The thickness of the resin layer 130 is controlled so as to be flush with the nozzle surface of the print head integrated circuit 31. This basically blocks the step portion caused by the side edges of the print head integrated circuit φ 3 1 . By guiding the wiper strip 1 3 8 to the nozzle surface by the resin layer 130, the front side edge of the print head integrated circuit will be covered' from being subjected to a hard collision with the wiper. Therefore, the print head integrated circuit 31 will be less damaged and worn, and the wiper can achieve effective cleaning using only a moderate contact force. Colliding with the front side edge of the nozzle surface causes the wiper blade to bounce and lose contact with the printhead integrated circuit. The print head integrated circuit is made to planarize the nozzle surface. Straight nozzle surfaces are easier to clean because dust and contaminants are less likely to settle and cannot separate from the nozzle openings. This process is described in detail in U.S. Patent Application Serial No. 1/877, 667, filed on Jan. Briefly, 'the nozzle structures have a layer of photoresist deposited on them' and then sealed under the nozzle surface layer of tantalum oxide or tantalum nitride. This relatively hard tantalum nitride or tantalum oxide has better wear resistance than a print head integrated circuit made of a polymer resist material on the nozzle surface. Fig. 7B shows that the wiper blade 138 is located at the trailing edge of the printhead integrated circuit 3j. This wiper pushes the ball of dust and contaminants to the front. Located at the end of the trailing end is a mass of sealant material 132. The sealant 133 encloses a wire follower (not shown) for transferring power and print data to the print head integrated circuit 31. The power and information is fed by a print engine controller (not shown) to a row of contacts 1 42 disposed on the edge of the flexible printed circuit board 144. The flexible printed circuit board 144 surrounds the underlying concave surface 146 on the bottom side of the printhead assembly. Decreasing the flexible printed circuit board relative to the printhead integrated circuit reduces the height of the wire follower loop, thereby allowing the sealant mass 132 to be lowered. The Applicant has utilized this advantage by constructing the sealant cluster 132 as having an inclined surface 134 that slopes upward from the nozzle surface of the printhead integrated circuit. This inclined surface 134 can firmly push the contaminant ball 136 to the wiper 138. When the wiper 138 finally leaves the outer surface, the contaminant ball 136 will be less likely to remain on the print head. For convenience, the encapsulant 132 and the epoxy layer 130 may be the same polymeric material. The polymeric material must be thixotropic; that is, it must not flow under its own weight. In this manner, the encapsulants 132 and -11 - 200932536 can be properly constructed and formed without the risk of material flowing into different shapes. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 shows a print head cartridge of the present invention installed in a printing engine of a printer. Figure 2 shows that the print engine does not have a print head cartridge to expose the inlet and outlet ink tube connectors. Figure 3 is an external view of a complete printhead cartridge in accordance with the present invention. Figure 4 shows the situation after the print head of the print head cartridge in Figure 3 is removed. Figure 5 is a partial exploded view of the printhead assembly in the printhead cartridge of Figure 3. Figure 6 is an exploded perspective view of the print head assembly without the inlet or outlet manifold or cap molding. Sections 7A and 7B are partial cross-sectional views of the print head assembly for cleaning the nozzle surface with a wiper blade. [Main component symbol description] 2: Print head assembly 3: Print engine 24: Main channel 26: Air hole 3 1 : Print head integrated circuit -12- 200932536 3 3 : Contact 42: Protective cover 44: Top molding 46: inlet sleeve 47: outlet sleeve 4 8: inlet manifold
5 〇 :出口歧管 5 2 :管嘴 54 :入口 56 :帽蓋 5 8 :抓持用紋路狀表面 66 :晶片接著膜 68 :通道模製件 72 :孔穴模製件 120 :插座 122 :孑L 口 124 :插口 1 2 6 :閂件 1 3 0 :樹脂層 1 3 2 :密封劑 1 3 4 :傾斜表面 1 3 6 :污染物球 1 3 8 :刮刷器片 140 :紙導件 -13- 200932536 142 :接點 144 :撓性印刷電路板 146 :下凹表面5 〇: outlet manifold 5 2 : nozzle 54 : inlet 56 : cap 5 8 : gripping surface 66 : wafer following film 68 : channel molding 72 : hole molding 120 : socket 122 : 孑L port 124: socket 1 2 6 : latch 1 3 0 : resin layer 1 3 2 : sealant 1 3 4 : inclined surface 1 3 6 : contaminant ball 1 3 8 : wiper piece 140 : paper guide - 13- 200932536 142: Contact 144: Flexible printed circuit board 146: concave surface