經濟部中央榡準局員工消費合作衽印製 A7 _____ _B7_ 1 - 五、發明説明（/ ) 本發明關於申請專利範圍第1項引文的一種在一發1寸 裝置砲口區域產生一磁場的裝置。 利用感應，可在飛行體(它特別可爲砲彈，但也可爲火 箭之類)的感應裝置(例如線圈系統）中在發射時產生電能。 此電能用於將電引發的引信供應能量，但也可用於供應控 制回路，俾能在飛行階段或達到目標時做特定之操作。例 如解除保險(Entsicherung)或射出過程。 在美專利US PS 1，739，921已提到，在一砲管之砲 口處設一線圏，呈同心繞發射開口，各種不同電壓可施加 其上。此線圏作用爲一種初級線圈方式，一如一種變壓器 (Trafo)，作用到設在砲彈中的次級線圏，當通過初級線圈 的磁場時，有一電壓感應到次級線圈中，該電壓用作引信 的時間控制。在這種引爆系統的電壓產生方式有一缺點， 即：爲了供電給磁線圏，在發射裝置的砲口區域須維持一 電能源。由於所產生的發射氣體會使磁線圈及其端子有腐 蝕之虞，且由於震動，會在端子造成接觸不良的問題。 在德專利公開案DE-OS 27 06 168發表了一種在砲彈引 信中產生引爆電流的裝置。此砲彈包含一永久磁鐵環及一 軛件的一部分。軛件另一部分位於砲管末端且由多數鐵磁 性環構成，該鐵磁性環之間設有順磁性環。只要砲彈體位 在彈匣(Patronenhuelse)中，則該砲彈體受永久磁鐵產生之 磁場經該護套匣短路。當砲彈發射時，砲管就接任磁場的 短路。當砲彈通過鐵磁性環之設置時，磁場才會交替地開 路及短路，因此在砲彈內的感應線圈由於磁場改變而感應 〜______ 3_!_____ 本紙張尺度適用中國國家標準（CNS ) A4规格（21〇Χ297公釐） ----------士水-- /^ / (請先閱讀背面之注意事項再填寫本頁) —訂 A7 B7 經濟部中央標率局員工消費合作衽印製 五、發明説明（>) 一股電流。此電壓大小依短路磁場之中斷數而定。在習知 之引爆系統中，在砲彈中用於產生引爆電流所需之永久磁 鐵係自動地作中斷。如此存在一種危險，即：當磁場的短 路作用意外地引起時，引爆器會動作。此外，由於另外帶 有永久磁鐵，使砲彈中有用之負載量，（例如炸藥），就 減了。 本發明的目的在提供一種簡單而安全的裝置，以在一 種飛行體的感應裝置在發射時產生一股電壓。 此目的係利用申請專利範圍第1項的特徵點達成.。本 發明有利的進一步特色見於申請專利副項。 依本發明，就不再需準備電能以產生一磁場以在一飛 行體感應裝置中感應一電壓以供應電給一種電觸發的引爆 劑以及控制回路，以及在發射裝置開口區域設一個、的電 子設備。依本發明的至少一個的永久磁鐵不需能量供應， 且可埋設在適當材料製的一殼體中而受防護免受侵蝕性的 射擊瓦斯侵鈾。 該至少一個永久磁鐵宜呈環狀繞該發射通道設置。如 此在發射通道中，磁場可均勻地構成，且有均勻的感應作 用。 爲了使永久磁鐵的磁場不會從外面以上下互相有不良 影響，宜將永久磁鐵埋入一種不會磁化的材料中。這些材 料舉例而言可爲耐熱樹脂或塑膠以及不磁化的金屬。如上 述，此處可將永久磁鐵完全包覆，使它受防護不受該發射 裝置的任何影響。 I.--------装-- (請先閱讀背面之注意事項再填寫本頁)A7 _____ _B7_ printed by the Consumers ’Co-operation Bureau of the Ministry of Economic Affairs 1-V. Description of the Invention (/) A device for generating a magnetic field in the muzzle area of a 1-inch device in the invention is cited in the first quotation of the scope of patent application . With induction, electrical energy can be generated during launch in an inductive device (such as a coil system) of a flying body (which can be a projectile in particular, but also an arrow or the like). This electric energy is used to supply electric-induced fuzes, but it can also be used to supply control loops, which can not perform specific operations during the flight phase or when the target is reached. Examples include de-insurance (Entsicherung) or injection processes. It has been mentioned in U.S. Patent No. 1,739,921 that a coil of wire is provided at the muzzle of a gun tube, and the firing opening is concentrically wound, and various voltages can be applied thereto. This line coil acts as a primary coil method, like a transformer (Trafo), and acts on the secondary wire coil set in the shell. When passing through the magnetic field of the primary coil, a voltage is induced into the secondary coil. Time control for fuze. One disadvantage of the voltage generation method in this detonation system is that, in order to supply power to the magnetic coil, an electrical energy source must be maintained in the muzzle area of the launcher. The generated emission gas may cause corrosion of the magnetic coil and its terminals, and due to vibration, it may cause poor contact problems at the terminals. The German patent publication DE-OS 27 06 168 discloses a device for generating a detonating current in a projectile fuze. The shell contains a permanent magnet ring and a part of a yoke. The other part of the yoke is located at the end of the barrel and is composed of most ferromagnetic rings with paramagnetic rings arranged between the ferromagnetic rings. As long as the shell is in the magazine (Patronenhuelse), the shell is short-circuited by the magnetic field generated by the permanent magnet through the jacket case. When the shell is fired, the barrel takes over the short circuit of the magnetic field. When the projectile passes through the ferromagnetic ring, the magnetic field will alternately open and short. Therefore, the induction coil inside the projectile is induced by the change of the magnetic field ~ ______ 3 _! _____ This paper size applies the Chinese National Standard (CNS) A4 specification (21 〇Χ297mm) ---------- Shishui-/ ^ / (Please read the precautions on the back before filling out this page) — Order A7 B7 Seal of Employees' Co-operation of the Central Standards Bureau of the Ministry of Economic Affairs Fifth, the invention (>) a current. This voltage depends on the number of interruptions in the short-circuit magnetic field. In conventional detonation systems, the permanent magnet system required to generate a detonation current in the shell is automatically interrupted. There is a danger that the detonator will operate when the short-circuit effect of the magnetic field is accidentally caused. In addition, because of the additional permanent magnets, the useful load (such as explosives) in the shell is reduced. The object of the present invention is to provide a simple and safe device to generate a voltage when a sensing device of a flying body is launched. This objective is achieved by using the characteristic point of the first patent application scope. Further advantageous features of the invention can be found in the patent application. According to the present invention, it is no longer necessary to prepare electrical energy to generate a magnetic field to induce a voltage in a flying body induction device to supply electricity to an electrically triggered detonator and a control circuit, and an electronic device. At least one of the permanent magnets according to the present invention requires no energy supply and can be buried in a housing made of a suitable material to be protected from corrosive firing gas invading uranium. The at least one permanent magnet is preferably arranged in a ring shape around the transmitting channel. In this way, in the transmission channel, the magnetic field can be formed uniformly and has a uniform induction effect. In order to prevent the magnetic field of the permanent magnet from adversely affecting each other from the top to the bottom, the permanent magnet should be buried in a non-magnetizable material. These materials can be, for example, heat-resistant resins or plastics and non-magnetized metals. As mentioned above, the permanent magnet can be completely covered here so that it is protected from any influence of the launcher. I .-------- install-(Please read the precautions on the back before filling this page)
、1T 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標率局員工消費合作社印製 A7 _B7 _ : 五、發明説明（、） 由永久磁鐵產生的磁場強度須依飛行體(砲彈或火箭） 的引爆器控制回路的電能需求而定。因此’如果將多個永 久磁鐵先後(沿射擊方向看)設置，則甚有利。在一線圈中 做多重感應，可使感應裝置中感應的電壓提高。 爲了依目標感應一定強度的電壓，如將數個具不同磁 場強度的永久磁鐵組合，則甚有利。不同磁場強度的所要 順序可依永久磁鐵的相關設置而達成。 此外，各種不同磁場強度的序別(藉此序列感應出各種 不同強度的電壓的順序)以及感應之電壓強度可用於發一信 號到一引爆器或一控制回路。其中，該感應順序可—如一 個碼使用，例如，當相關的電子電路設在砲彈或火箭中時 ，用於調整引爆時刻或飛行期間或飛行方向。 不同時間間隔的感應順序也可同樣地可當作信號使用 。如果磁鐵相隔預定距離設置，而這些距離可各不相同， 則這種信號順序可有利地達成。 如果磁鐵設置成使磁場儘可能地不會互相呈負面影響 ，則隨預設距離設置永久磁鐵就甚有利。當永久磁鐵具有 不同強度磁場時，此距離可依磁場定作選設。 另一種將信號送到砲彈的引信或火箭的控回路的可能 方式，係將不同磁場強度的永久磁鐵相隔不同距離設置， 如此可利用感應的不同時間順序配合其不同強度而產生一 系列信號。其先決條件爲：引爆系統含有一電子電路，它 由不同感應強度及不同感應順序產生所要信號。因此，還 可有更多的編碼方式，舉例而言’可以將引爆時刻或控制 ____^__ __ 本紙張尺度適用中國國家標準（CNS ) A4规格（210 X 297公釐） (請先聞讀背面之注意事項再填寫本頁)、 1T This paper size applies Chinese National Standard (CNS) A4 specification (210X297 mm). Printed by A7 _B7 _ of the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. 5. Description of the invention () The magnetic field strength generated by the permanent magnet must be in accordance with Depending on the power requirements of the initiator control loop of the flying object (cannonball or rocket). Therefore, it is very advantageous if a plurality of permanent magnets are arranged one after another (as viewed in the shooting direction). Multiple induction in one coil can increase the voltage induced in the induction device. In order to induce a voltage of a certain strength according to the target, it is very advantageous to combine several permanent magnets with different magnetic field strengths. The required sequence of different magnetic field strengths can be achieved according to the relevant settings of the permanent magnet. In addition, the sequence of various magnetic field intensities (the sequence in which various voltages of different intensities are induced) and the induced voltage intensity can be used to send a signal to an initiator or a control loop. Among them, the induction sequence can be used as a code, for example, when the relevant electronic circuit is set in a cannonball or rocket, and is used to adjust the time of detonation or during flight or flight direction. The sensing sequence at different time intervals can also be used as a signal. This sequence of signals can be advantageously achieved if the magnets are arranged a predetermined distance apart and these distances can be different. If the magnets are set so that the magnetic fields do not adversely affect each other as much as possible, it is advantageous to set the permanent magnets with a preset distance. When the permanent magnet has a magnetic field with different strength, this distance can be selected according to the magnetic field. Another possible way to send the signal to the fuze of the cannonball or the control loop of the rocket is to set the permanent magnets with different magnetic field strengths at different distances. In this way, a series of signals can be generated by using different time sequences of induction with their different strengths. Its prerequisite is that the detonation system contains an electronic circuit that generates the desired signal from different induction strengths and different induction sequences. Therefore, there can be more coding methods, for example, 'can detonate the moment or control ____ ^ __ __ This paper size applies the Chinese National Standard (CNS) A4 specification (210 X 297 mm) (Please read first (Notes on the back then fill out this page)
經濟部中央標隼局員工消費合作衽印製 A7 B7 五、發明説明（中） 回路作一定之調整。利用感應的數目，時間間隔，以及感 應電壓之不同強度，可對應於上述預設値時將三種不同資 訊送到一飛行體之引爆器的電子電路或一控制回路(例如一 導向系統)(如果它們做了相關的設計的話）。 茲利用較佳實施例詳細說明本發明。 圖式中 第一圖係在一發射裝置砲口區域中永久磁鐵的設置’ 第二圖係在一發射裝置砲口區域中三個永久磁鐵的設 置’沿發射方向看係前後設置， 第三圖係具不同磁場強度的三個永久磁鐵的設置，它 們隔不同距離前後設置。 第一圖中顯示發射裝置的一砲管(1)。此處只顯示與本 發明有關的特點並作說明。在發射裝置（1)的砲口（2)的區域 中，設有產生磁場的裝置，整體用（3)表示。此裝置（1)包含 一殼體(4)，該殻體有永久磁鐵(5)。 在此實施例中，永久磁鐵(5)完全被一種不會磁化的材 料(4)(例如一種耐熱塑膠)包覆，該材料同時構成磁鐵的殼 體，並保護它們免受射擊瓦斯的侵蝕。 殻體(4)與發射管(1)之間係用螺紋連接部(6)作連接。殼 體(4)旋合到砲管（1)的砲口（2)上。一砲彈(7)已從該砲管（1) 的砲口（2)區域區來。砲管（1)，產生磁場⑼的裝置(3)，以 及砲彈(7)用剖面圖顯示。 在此實施例中，永久磁鐵(5)呈環形繞著砲彈通道(8)。 它所產生的磁場(9)具有預定之磁場強度。砲彈(7)通過砲彈 —-----'---I__ (讀先閱讀背面之注意事項再填寫本頁) 訂 參丨 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標準局員工消費合作社印製 A7 _B7___ . 五、發明説明（ 通道(8)沿發射方向（10)經過具有永久磁鐵(5)的本發明裝置 (3)。如此，砲彈(7)的引信(Z)的感應裝置(11)〔在此實施例 中係一環形線圈（11)〕通過磁場(9)。由於磁通量改變，在 感應線圈（11)中感應出一電壓。此電壓係由預設之磁場(9) 及砲彈(7)的運動而預設。感應的電壓經導線（12)送到砲彈 (7)的電子電路(13)，並在該處以適當形成儲存，例如存在 一電容器(14)中，並準備用於將引爆劑(25)引爆。此外，該 感應之電壓係用於利用一電子電路（圖未示)將引爆時刻預 先設計。感應電壓的應用並非本發明的標的，且在背景技 術中已充分習知。 第二圖的實施例顯示一發射裝置(1)、一砲管，在砲管 之砲口⑵區域有三個永久磁鐵(51)(52)(53)以產生磁場。這 些永久磁鐵(51)(52)(53)沿發射方向(10)看，係爲前後設置。 這三個磁鐵的磁場強度可相同，但也可不同。 如果砲彈(7)〔沿發射方向（10)看〕先後經過個別的磁 場(91)(92)(93)，則在砲彈(7)的感應裝置（11)中有三次感應 生電壓。利用線圈的相關的配線，可將可用之總電壓提高 〇 在此實施例中，砲彈(7)的電子電路（13)另外還包含一 選擇電路（15)，藉可選擇該感應之數目，亦即被通過之一 磁鐵(91)〜（93)的數目。此選擇電路(15)可用於利用砲彈(7) 之電子電路(15)之感應數目而設一資訊。舉例而言，此資 訊可用於預設砲彈的引爆時刻。在此實施例中，永久磁鐵 (51)(52)及（53)的殻體(41)(42)(43)利用螺紋（16)連接，殼體 -----2---- 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁) 訂 經濟部中央標準局員工消費合作社印製 A7 ____ B7 五、發明説明（t) (41)(42)(43)的設計使得永久磁鐵(51)與永久磁鐵(52)之間的 距離(17)以及永久磁鐵(52)與永久磁鐵(53)之間的距離(18)— 樣大。 第三圖的實施例同樣有三個永久磁鐵當作產生磁場的 裝置(32)，它們繞發射通道(8)呈同心設置。永久磁鐵(511) 〔沿發射方向（10)看〕另二個永久磁鐵(522)(533)連接。這 二個永久磁鐵各有一磁場(922)及(933)，其磁場強度與永久 磁鐵各有不同。磁場(922)與(933)的磁場強度也互不相同。 此外，永久磁鐵(511)與永久磁鐵(522)之間的距離（19)比永 久磁鐵(522)與永久磁鐵(533)之間的距離(20)大。 砲彈⑺的電子電路(13)包含一儲存器（14)以儲存電能， 並包含一選擇電路（15)，在砲彈(7)通過磁場(911)(922)(933) 時選擇所造成的感應。當通過個別磁場時，各感應出不同 強度的電壓，其中強度係依磁場強度而定，且利用電子電 路(24)檢出。此外，感應作用亦以不同的時間間隔產生’ 這種時間間隔係依個別之永久磁鐵(511)(522)或(533)之間的 距離(19)或(20)而定。因此之故，砲彈⑺的電子電路U3)另 外包含一電路(21)，藉之檢出個別感應之間的時間間隔’ 也就是感應裝置（11)經過先後設置之磁場(991)(922)(933)各 次通過之間的間隔。 不同之磁場強度及感應電壓的不同強度以及各次感應 之間不同的時間間隔可利用作資訊以通知砲彈(7)的電子電 路(13)。 和前述實施例不同者，由於磁場強度不同’以及它們 ________8—------ 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） (請先閱讀背面之注意事項再填寫本頁) -士衣· 經濟部中央標準局員工消費合作社印製 A7 _B7 五、發明説明（j) 的間隔不同，故資訊信號的可能方式大爲增加，因此，可 依可能之編碼數目而控制引信(z)中的不同功能。 殼體(411)(422)利用螺紋（16)互相連接。在此實施例中 ，殼體（422)(433)各有一外螺紋(23)，且由於二永久磁鐵 (522)(533)之間距離很小，故經一套筒(Muffe)(22)互相連接 。由於用螺合連接，故永久磁鐵本身可很容易更換，也可 和其他永久磁鐵很容易地交換。因此，可利用永久磁鐵之 間不同距離，以及不同磁場強度的永久磁鐵的組合，而在 砲彈(7)的感應裝置（11)中感應一定強度的電壓，並改變感 應的時間間隔。如此’可將各種不同資訊送到砲彈(7)的電 子電路。 ------:--^---粟-- (請先閱讀背面之注意事項再填寫本頁) 訂_ ______9- 本紙張尺度適用中國國家標準（CNS ) A4規格（2丨〇><297公釐〉Printed by employees of the Central Bureau of Standards of the Ministry of Economic Affairs on consumer cooperation A7 B7 V. Description of invention (middle) The circuit has been adjusted. Using the number of inductions, the time interval, and the different strengths of the induced voltages can correspond to the above-mentioned preset time to send three different kinds of information to the electronic circuit of a detonator of a flying body or a control circuit (such as a guidance system) (if They are related design words). The present invention is described in detail using preferred embodiments. The first picture in the drawing is the setting of the permanent magnets in the muzzle area of a launching device. The second picture is the setting of three permanent magnets in the muzzle area of a launching device. The arrangement of three permanent magnets with different magnetic field strengths, which are arranged back and forth at different distances. The first figure shows a gun barrel (1) of the launcher. Only the features relevant to the invention are shown and explained here. In the area of the muzzle (2) of the launching device (1), a device for generating a magnetic field is provided, which is indicated as a whole by (3). The device (1) comprises a housing (4) which has a permanent magnet (5). In this embodiment, the permanent magnets (5) are completely covered with a non-magnetizable material (4), such as a heat-resistant plastic, which simultaneously forms the magnet's casing and protects them from the attack of shooting gas. The casing (4) and the launch tube (1) are connected by a threaded connection portion (6). The casing (4) is screwed onto the muzzle (2) of the barrel (1). A shell (7) has come from the muzzle (2) area of the barrel (1). The barrel (1), the device (3) that generates the magnetic field chirp, and the shell (7) are shown in cross-section. In this embodiment, the permanent magnet (5) loops around the shell channel (8). The magnetic field (9) it generates has a predetermined magnetic field strength. Cannonball (7) through the cannonball -------'--- I__ (Read the precautions on the back before filling this page) Ordering 丨 This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) Printed by A7 _B7___ of the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs. 5. Description of the invention (the channel (8) passes along the launching direction (10) of the device (3) of the invention with a permanent magnet (5). In this way, the shells (7) The induction device (11) of the fuze (Z) is a loop coil (11) in this embodiment. It passes through the magnetic field (9). Due to the change in magnetic flux, a voltage is induced in the induction coil (11). This voltage is determined by The preset magnetic field (9) and the movement of the cannonball (7) are preset. The induced voltage is sent to the electronic circuit (13) of the cannonball (7) via the wire (12), and is stored there in an appropriate form. For example, there is a The capacitor (14) is prepared to detonate the detonating agent (25). In addition, the induced voltage is used to pre-design the detonation time using an electronic circuit (not shown). The application of the induced voltage is not the invention Target, and is well known in the background art. The embodiment of the second figure shows a Firing device (1), a barrel, three permanent magnets (51) (52) (53) in the muzzle area of the barrel to generate a magnetic field. These permanent magnets (51) (52) (53) are in the firing direction (10) See, it is set back and forth. The magnetic field strength of these three magnets can be the same, but they can also be different. If the projectile (7) [looking along the launch direction (10)] passes through the individual magnetic fields (91) (92) (93), there are three induced voltages in the induction device (11) of the shell (7). By using the relevant wiring of the coil, the total available voltage can be increased. In this embodiment, the electrons of the shell (7) The circuit (13) also includes a selection circuit (15), by which the number of inductions can be selected, that is, the number of one magnet (91) to (93) passed. This selection circuit (15) can be used to use the shell 7) The information is set by the number of inductions of the electronic circuit (15). For example, this information can be used to preset the detonation time of the shell. In this embodiment, the permanent magnets (51) (52) and (53) The shell (41), (42), (43) are connected by the thread (16), the shell ----- 2 ---- This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) ( (Please read the notes on the back before filling this page) Order the printed A7 ____ B7 by the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs V. Description of the invention (t) (41) (42) (43) The design of the permanent magnet (51) and The distance (17) between the permanent magnets (52) and the distance (18) between the permanent magnets (52) and the permanent magnets (53) are the same. The embodiment of the third figure also has three permanent magnets as a magnetic field. The device (32) is arranged concentrically around the transmitting channel (8). Permanent magnet (511) [Looking in emission direction (10)] The other two permanent magnets (522) (533) are connected. Each of these two permanent magnets has a magnetic field (922) and (933), the magnetic field strength of which is different from that of the permanent magnet. The magnetic field strengths of the magnetic fields (922) and (933) are also different from each other. The distance (19) between the permanent magnet (511) and the permanent magnet (522) is larger than the distance (20) between the permanent magnet (522) and the permanent magnet (533). The electronic circuit (13) of the artillery shell contains a storage (14) to store electrical energy, and includes a selection circuit (15) that selects the induction caused when the projectile (7) passes through the magnetic field (911) (922) (933). . When passing through individual magnetic fields, voltages of different intensities are induced, wherein the intensity depends on the intensity of the magnetic field and is detected by an electronic circuit (24). In addition, the induction effect is also generated at different time intervals. This time interval depends on the distance (19) or (20) between the individual permanent magnets (511) (522) or (533). For this reason, the electronic circuit U3) of the cannonball shell additionally contains a circuit (21), by which the time interval between individual inductions is detected, that is, the magnetic field (991) (922) (991) (922) ( 933) Interval between passes. Different magnetic field strengths, different strengths of induced voltages, and different time intervals between inductions can be used as information to inform the electronic circuit (13) of the shell (7). Different from the previous embodiments, due to the different magnetic field strengths' and their ________ 8 ---------- This paper size applies to China National Standard (CNS) A4 specifications (210X297 mm) (Please read the precautions on the back before filling (This page)-Printed by Shiyi · Central Standard Bureau Staff Consumer Cooperative of the Ministry of Economic Affairs A7 _B7 V. The description of invention (j) has different intervals, so the possible ways of information signals are greatly increased, so it can be controlled according to the number of possible codes Different functions in fuze (z). The housings (411) (422) are connected to each other by means of threads (16). In this embodiment, the housings (422) (433) each have an external thread (23), and because the distance between the two permanent magnets (522) (533) is small, a sleeve (22) Connected to each other. Due to the screw connection, the permanent magnet itself can be easily replaced or easily exchanged with other permanent magnets. Therefore, different distances between the permanent magnets and the combination of permanent magnets with different magnetic field strengths can be used to induce a certain strength voltage in the induction device (11) of the cannonball (7) and change the time interval of the induction. In this way, various information can be sent to the electronic circuit of the shell (7). ------:-^ --- Su-- (Please read the notes on the back before filling out this page) Order _ ______ 9- This paper size applies to China National Standard (CNS) A4 Specification (2 丨 〇 > < 297 mm>