•-M324222 八、新型說明： 【新型所屬之技術領域】 本創作係關於一種背光模組，尤指一種 _ 裡J改善側光式 - 【先前技術】 ' 在中小尺寸的f光模組的領域中，I來為了節省整個 • #光模組於運作時所消耗之電能，業界皆積極開發使用發 光二極體做為光源的產品。但是，由於發光二極體（如白光 H)發光二極體）為一「點光源」，而非「線光源」^以相較 於以往之使用冷陰極管（CCF_f光模組而言，目前利用 發光二極體做為光源之背光模組具有較為嚴重之「車頭燈 效應」（h〇tSp〇t)，使得整個背光模組無法勺: 度分佈。意即，當背光模組運作時，使用者可輕 上顯示器靠近光源（發光二極體）部分區域的亮度比顯示器其 φ 餘部分區域之亮度為大，且此—部分的發光形狀類似一汽 • 機車所使用之車頭燈照亮之區域的分佈形狀。 • 如®1所* ’習知之側光式背光模組！包括：一導光板 u及複數個發光二極體12。其中，導光板11具有一入光面 ⑴及複數個凹槽112，且複數個凹槽u2分別設置於其上。 此外& % 一極體i 2之位置係對應於凹槽⑴之位置，以使 其所提供之光源經由凹槽112之表面ιι3而進入導光板u 内但疋，由於發光二極體12所提供之光源僅在凹槽丨} 2 之表面113經過—次「折射」便進人導光板㈣，這些光源 5 •M324222 並無法均勾地分佈至導光板的各個部分，所以習知之側光 式背光模組仍無法完全抑制「車頭燈效應」的發生。 因此業界s而—種可改善「車頭燈效應」之現象發 生的側光式背，模組，以提昇此-側光式背光模組之「外 觀品味」及提向背光模組亮度的均一性。 【新型内容】 本創作之側光式背光模組包括：一光源；以及一導光 板，具有-側邊之入光面及一向上之出光面，此入光面呈 有-對應此光源之凹槽，且此凹槽之表面具有複 面 tit. 叫 鏡。 15 20 本創作之側光式背光模組包括：—光源；以及一導光 板，具有-側邊之入光面、一向上之出光面及一凹槽，此 凹槽對應於此光源，且此凹槽之表面具有複數㈣面 其中，此凹槽具有一底面，Hμ 具有一間距。錢底面與此導光板之入光面 因此’藉由這些設置於本創作之側光式背光模組所且 之導先板之凹槽表面的凹面鏡’發光二極體所提供之光源 除了因為被凹槽折射而改變其行進方向外，它們亦可再―、 次地被這些形成於凹槽之表面的凹面鏡折射而到達本創作 之側先式背光模組之導光板的各個部分。意即，在本 之側光式背光模組中，發光二極體 至少兩次的「折射」，才會進入導之先源均會經過 ,^ 運入冷先板内並分別到達導光 板的各個部分。因此，本創作之側光式背光模組相較於習 6 • M324222 知之側光式背光模組而言，可更有效地改善「車頭燈效庫」 現象的！生並且可進-步地提昇其「外觀品味」及提高背 光模組焭度的均一性。 10 15 20 本創作之側光式f光模組所具之導光板之凹槽表面 的凹面鏡可具有任何形狀，其形狀較佳為口形、半圓炉、 半橢圓形、圓弧形、具有弧形頂端之多邊形或前述各種形 狀之組合。本創作之側光式背光模組所具之導光板在每— 個凹槽中可具有任何數目之凹面鏡，其數目較佳介於35至 5〇 ’最佳介於4〇至45。本創作之側光式背光模組可配合使 用任何種Θ之光源，其較佳為發光二極體或任何類型的點 光源。本創作之側光式背光模組可配合使用任何種類之發 光二極體，其較佳為紅光發光二極體、綠光發光二極體、 藍光發光二極體或白光發光二極體。本創作之側光式背光 模組可更包括一任何類型之反射裝置於其導光板之底表 面/、車乂佳為&射片或一具有反射功能之膜層。 【實施方式】 圖2A係本創作第一較佳實施例之側光式背光模組的 立體示意圖’其顯示本創作第一較佳實施例之側光式背光 模組2包括：一導光板21，其具有一側邊之入光面22、一向 上之出光面23、複數個凹槽24、複數個凹面鏡25 ’以及複 數個發光二極體26。其中’複數個凹槽财別設置於導光 反1之入光面22上。此外，如圖2B所示，每一個凹槽μ均 具有一表面241，而前述之凹面鏡25便分別設置於其上。最 7 • M324222 後’複數個發光二極體26分別設置在對應於複數個凹槽24 的位置上’以使這些發光二極體26所提供之光源經由凹槽 24及凹面鏡25而進入導光板21内。此外，為了提昇導光板 2 1所提供之光源的亮度，本創作第一較佳實施例之側光式 5月光模組於導光板21之底表面（圖中未示）設置一反射片 27，以將那些從導光板之底表面逸出的光線反射回導光板 21内。另一方面，為了更進一步地提昇導光板21所提供之 _ 光源的均勻性，本創作第一較佳實施例之側光式背光模組 之導光板21可選擇性地設置複數個網點（圖中未示）於其 10中，使前述之經由凹槽24及凹面鏡25而進入導光板21内的 光源被這些網點產生雜亂地散射現象，再從出光面射出。 如圖2A所示，那些形成於導光板21之入光面22的複數 個凹槽24均具有相同的寬度，且雖然在此較佳實施例中， 發光二極體26之數目為3，但其數目並不僅限於此。此外， b本創作第一較佳實施例之側光式背光模組可依據實際應用 的需要而使用不同數目之發光二極體26，以提供最適合此 應用之光源。同樣地，雖然在此較佳實施例中，發光二 •極體26為白光發光二極體，但其種類亦不侷限於白光發光 一極體，本創作第一較佳實施例之側光式背光模組亦可依 20據實際應用的需要而使用不同種類之發光二極體％以提供 不同顏色之光源，如藍光、綠光或紅光等。 、接著#參閱圖2B，其係本創作第一較佳實施例之側 光式背光模組所具之凹槽的局部放大上視示意圖，其係將 圖2A中位於導光板21一端的區域八加以放大而得。如圖⑶ 8 •M324222 所示，在此較佳實施例中， 电I 凹槽24為半圓形，而形成於豆 表面241之凹面鏡25的形狀則為 ” ^ ^ η ^ 且母一凹面鏡25的寬 度均相同。需注意的是，在本創 ._. _ ^ ,„ ^ ^ θ 个劓作第一較佳貫施例之側光 式月先杈組所具之導光板中， / ,,、 才曰24及凹面鏡25的數目及 形狀並不限於圖2Α及圖2Β所干夕叙 ^ 口 β所不之數目及形狀，它們亦可且 有不同的數目及不同的形狀。實 ^ y κ丨不上，在母一個凹槽24中， 形成於其表面241之凹面Ώ | 、兄的數目較佳介於35至50,最佳 "於40至45。此外，當「凹槽2 ^ Γ 1曰見度」介於「凹面鏡25 之λ>度」的2 5至3 0倍時，本創作裳 +到1乍弟一較佳貫施例之側光式 背光模組纽前述之「車頭賤應」的效果較佳，且可顯 著提料創作第—較佳實施例之側光式背光模組的外觀品 味及提咼背光模組亮度的均一性。 圖3 Α係本創作第二較佳實施例之側光式背光模組的 立體示意圖，其顯示本創作第二較佳實施例之側光式背光 15模組3包括：-導光板31，其具有一側邊之入光面^、一向 上之出光面33、複數個凹槽34、複數個凹面鏡^，以及複 數個發光二極體36。其中，複數個凹槽“分別具有一底面 34卜且每一凹槽34之底面341與導光板31之入光面”具有 一間距。此外，每一個凹槽34亦具有一表面342，而前述之 20凹面鏡35便分別設置於其上。冑後，複數個發光二極體％ 分別設置在對應於複數個凹槽34的位置上，以使這些發光 二極體36所提供之光源能均勻地進入導光板31内。此外， 為了提昇導光板31所提供之光源的亮度，本創作第二較佳 貫施例之側光式背光模組於導光板3 1之底表面（圖中未示 M324222 設置-反射片37,以將那些從導光板之底表面逸出 反射回導光板3】内。另一方面，為了更進—步提 朗提供之光源的均句性，本創作第二較佳實施例之導光 板3 1可選擇性地設置複數個網點（圖中未示苴 )、/、中，~〇τρ 述之進人導光板31内的光源被這些網點產生㈣地散 象，再從出光面33射出。 、 再如圖3Α所示，那些形成於導光板31之鄰近入光㈣ 之一端的複數個凹槽34均具有相同的寬度，也就是它 =^有之底面341的寬度均相同。此外，這些凹槽Μ所具 有之底面距離入光面32的間距也都相同。此 較佳實施例中，發光二極體36之數目為3,但其數目=僅匕 15 20 限於此。此外，本創作第二較佳實施例之侧光式背光模组 可依據實際應用的需要而使用不同數目之發光二極體％， 以提供最適合此一應用之光源。同樣地，雖然在此較佳實 施例中，發光二極體36為白光發光二極體’但其種類亦不 :限於白光發光二極體’本創作第二較佳實施例之側光式 背光模組亦可依據實際應用的需要而使用不同種類之發光 二極體36以提供不同顏色之光源，如藍光、綠光或紅光 接著，請參閱圖3Β，其係本創作第二較佳實施例之側 光式背光模組所具之凹槽的局部放大上視示意圖，其係將 圖3Α中位於導光板31_端的區域8加以放大而得。如圖π 所示’在此較佳實施例中’本創作第二較佳實施例之側光 式背光模組所具之導光板31之凹槽34為半圓形，而形成於 其表面342之凹面鏡35的形狀亦為半圓形，且每一凹面鏡％ 10 -M324222 的寬度均相同。需注意的是，在本創作第二較佳實施例之•-M324222 VIII. New description: [New technical field] This creation is about a kind of backlight module, especially a kind of _ 里J improved side-light type - [Prior Art] 'In the field of small and medium size f-light modules In order to save the entire energy consumption of the optical module during operation, the industry is actively developing products using light-emitting diodes as light sources. However, since the light-emitting diode (such as white light H) light-emitting diode is a "point light source" rather than a "line light source", compared with the conventional cold cathode tube (CCF_f optical module, currently The backlight module using the light-emitting diode as a light source has a relatively serious "headlight effect" (h〇tSp〇t), so that the entire backlight module cannot be scooped up. That is, when the backlight module operates, The user can lightly display the brightness of the portion of the display near the light source (light emitting diode) larger than the brightness of the remaining portion of the display, and the portion of the light emitting shape is similar to the area illuminated by the headlights used by the FAW locomotive. The shape of the distribution is as follows: • The light-emitting backlight module of the prior art includes: a light guide plate u and a plurality of light-emitting diodes 12. The light guide plate 11 has a light-incident surface (1) and a plurality of concave surfaces. a groove 112, and a plurality of grooves u2 are respectively disposed thereon. Further, the position of the & % one body i 2 corresponds to the position of the groove (1) so that the light source provided is via the surface ιι3 of the groove 112. Entering the light guide plate u but 疋, due to hair The light source provided by the diode 12 enters the light guide plate (4) only after the "refraction" of the surface 113 of the groove 2} 2, and these light sources 5 • M324222 cannot be uniformly distributed to the respective portions of the light guide plate, so The conventional side-lit backlight module still cannot completely suppress the occurrence of the "headlight effect". Therefore, the industry has a side-light type back and module that can improve the phenomenon of "headlight effect" to enhance this side. The "appearance taste" of the light-type backlight module and the uniformity of the brightness of the backlight module. [New content] The side-lit backlight module of the present invention comprises: a light source; and a light guide plate having a side entrance The light surface and an upward light exit surface, the light incident surface has a groove corresponding to the light source, and the surface of the groove has a complex surface. The mirror is called a mirror. 15 20 The side light backlight module of the present invention comprises: a light source; and a light guide plate having a side entrance light surface, an upward light exit surface, and a groove corresponding to the light source, wherein the surface of the groove has a plurality of (four) faces, wherein the groove Has a bottom surface, Hμ has a spacing. The surface of the light guide plate and the light-incident surface of the light guide plate are provided by the concave mirror 'light-emitting diodes provided on the groove surface of the guide plate of the side light-emitting backlight module of the present invention. The grooves are refracted to change their direction of travel, and they may be refracted by the concave mirrors formed on the surface of the grooves to reach the respective portions of the light guide plate of the side-precision backlight module of the present invention. In the edge-lit backlight module of the present invention, at least two "refractions" of the light-emitting diodes will pass through the first source of the guide, and are transported into the cold front plate and respectively reach the respective portions of the light guide plate. The side-lit backlight module of this creation can improve the phenomenon of "headlight effect library" more effectively than the side-light backlight module of Xi 6 • M324222! It is also possible to further enhance its "appearance" and improve the uniformity of the backlight module. 10 15 20 The concave mirror of the groove surface of the light guide plate of the side light type f-light module of the present invention may have any shape, and the shape thereof is preferably a mouth shape, a semicircular furnace, a semi-elliptical shape, a circular arc shape, and an arc shape. The top polygon or a combination of the various shapes described above. The light-guided backlight module of the present invention has a light guide plate having any number of concave mirrors in each of the grooves, and the number thereof is preferably between 35 and 5 ’' optimally between 4 〇 and 45. The side-lit backlight module of the present invention can be used with any kind of light source, preferably a light-emitting diode or any type of point source. The side-lit backlight module of the present invention can be used with any kind of light-emitting diode, and is preferably a red light-emitting diode, a green light-emitting diode, a blue light-emitting diode or a white light-emitting diode. The side-lit backlight module of the present invention may further comprise a reflective device of any type on the bottom surface of the light guide plate, the ruthenium & film or a reflective layer. 2A is a perspective view of the edge-lit backlight module of the first preferred embodiment of the present invention. The front-lit backlight module 2 of the first preferred embodiment of the present invention includes: a light guide plate 21 It has a light incident surface 22 on one side, an upward light exit surface 23, a plurality of grooves 24, a plurality of concave mirrors 25', and a plurality of light emitting diodes 26. Among them, a plurality of grooves are disposed on the light incident surface 22 of the light guide. Further, as shown in Fig. 2B, each of the grooves μ has a surface 241 on which the aforementioned concave mirrors 25 are respectively disposed. At most 7 • M324222, a plurality of light-emitting diodes 26 are respectively disposed at positions corresponding to the plurality of grooves 24 such that the light sources provided by the light-emitting diodes 26 enter the light guide plate via the grooves 24 and the concave mirror 25 Within 21. In addition, in order to improve the brightness of the light source provided by the light guide plate 21, the side light type moonlight module of the first preferred embodiment of the present invention is provided with a reflection sheet 27 on the bottom surface (not shown) of the light guide plate 21, Light rays escaping from the bottom surface of the light guide plate are reflected back into the light guide plate 21. On the other hand, in order to further improve the uniformity of the light source provided by the light guide plate 21, the light guide plate 21 of the edge-lit backlight module of the first preferred embodiment of the present invention can selectively set a plurality of dots (Fig. In the case of 10, the light source entering the light guide plate 21 via the groove 24 and the concave mirror 25 is scattered by the dots, and is emitted from the light exit surface. As shown in FIG. 2A, the plurality of grooves 24 formed on the light incident surface 22 of the light guide plate 21 have the same width, and although in the preferred embodiment, the number of the light-emitting diodes 26 is three, The number is not limited to this. In addition, the edge-lit backlight module of the first preferred embodiment of the present invention can use different numbers of light-emitting diodes 26 according to the needs of practical applications to provide a light source that is most suitable for the application. Similarly, in the preferred embodiment, the light-emitting diode 26 is a white light-emitting diode, but the type thereof is not limited to the white light-emitting body, and the side light type of the first preferred embodiment of the present invention is created. The backlight module can also use different types of light-emitting diodes according to the needs of the actual application to provide light sources of different colors, such as blue light, green light or red light. 2B is a partially enlarged top plan view of the recess of the edge-lit backlight module of the first preferred embodiment of the present invention, which is the area of the light guide plate 21 in FIG. 2A. Enlarged. As shown in Fig. (3) 8 • M324222, in the preferred embodiment, the electric I groove 24 is semicircular, and the shape of the concave mirror 25 formed on the bean surface 241 is "^^ η ^ and the mother a concave mirror 25 The widths are the same. It should be noted that in the light guide plate of the side-light type 杈 杈 group of the first preferred embodiment of the present invention, _ ^ _ ^ , „ ^ ^ θ , / , The number and shape of the ridges 24 and the concave mirrors 25 are not limited to the numbers and shapes of the Figs. 2 and 2, and they may have different numbers and shapes. Actually, y κ 丨 is not in the concave groove 24 formed on the surface 241 of the mother, and the number of the brothers is preferably between 35 and 50, and the optimum is < 40 to 45. In addition, when the "groove 2 ^ Γ 1 visibility" is between 25 and 30 times the "λ > degree of the concave mirror 25", the creation of the skirt + to the 1st brother of a preferred embodiment of the side light The above-mentioned "header" has a better effect, and can significantly improve the appearance taste of the edge-lit backlight module of the first preferred embodiment and the uniformity of brightness of the backlight module. 3 is a perspective view of the edge-lit backlight module of the second preferred embodiment of the present invention, which shows that the edge-lit backlight module 3 of the second preferred embodiment of the present invention comprises: a light guide plate 31, The light-incident surface of one side, the light-emitting surface 33 of an upward direction, a plurality of grooves 34, a plurality of concave mirrors, and a plurality of light-emitting diodes 36 are provided. Wherein, the plurality of grooves "having a bottom surface 34 and a bottom surface 341 of each of the grooves 34 and the light incident surface of the light guide plate 31" have a spacing. In addition, each of the recesses 34 also has a surface 342 on which the aforementioned concave mirrors 35 are respectively disposed. After that, a plurality of light-emitting diodes are respectively disposed at positions corresponding to the plurality of grooves 34 so that the light sources provided by the light-emitting diodes 36 can uniformly enter the light guide plate 31. In addition, in order to improve the brightness of the light source provided by the light guide plate 31, the edge-lit backlight module of the second preferred embodiment of the present invention is disposed on the bottom surface of the light guide plate 31 (the M324222 is not shown as a reflection sheet 37, To reflect those from the bottom surface of the light guide plate back into the light guide plate 3. On the other hand, in order to further improve the uniformity of the light source provided by the second embodiment, the light guide plate 3 of the second preferred embodiment of the present invention is created. 1 Optionally, a plurality of dots (not shown), /, medium, and ~〇τρ are introduced, and the light sources in the light guide plate 31 are generated by the mesh points (4), and then emitted from the light exit surface 33. Further, as shown in FIG. 3A, the plurality of grooves 34 formed at one end of the light guide plate 31 adjacent to the light (4) have the same width, that is, the width of the bottom surface 341 is the same. The groove has a bottom surface which is also the same distance from the light incident surface 32. In the preferred embodiment, the number of the light emitting diodes 36 is three, but the number = only 15 20 is limited thereto. The edge-lit backlight module of the second preferred embodiment can be adapted to the needs of practical applications. A different number of light-emitting diodes are used to provide a light source that is most suitable for the application. Similarly, although in the preferred embodiment, the light-emitting diode 36 is a white light-emitting diode, the type is not The light-emitting backlight module of the second preferred embodiment of the present invention can also use different types of light-emitting diodes 36 to provide light sources of different colors, such as blue light, according to actual application requirements. Green light or red light, please refer to FIG. 3A, which is a partially enlarged top view of the groove of the edge-lit backlight module of the second preferred embodiment of the present invention, which is located in the light guide plate of FIG. The region 8 of the 31_ end is enlarged. As shown in FIG. π, the groove 34 of the light guide plate 31 of the second embodiment of the present invention is provided in the preferred embodiment. The shape of the concave mirror 35 formed on the surface 342 thereof is also semicircular, and the width of each concave mirror % 10 - M324222 is the same. It should be noted that in the second preferred embodiment of the present invention
側光式背光模組所且之導丼柘由 K J 目MW U板中H4及凹面鏡35的數 二==於圖3A及圖3β所示之數目及形狀，它們亦 了：有不同的數目及不同的形狀。實際上，在每一個凹槽 ’ 5: C表面342之凹面鏡35的數目較佳介於35至 :=:Γ至45。此外’當「凹槽34之寬度」介於「凹 ==度」的25至3〇倍時，本創作第二較佳實施例之 =1=組克服前述之「車頭燈效應」的效果較佳， 外： = = ί紹乍第二較佳實施例之側光式背光模組的 卜靦扣味及提南背光模組亮度的均一性。 15 20 二:述’藉由這些設置於本創作之側光式背光模組 ，、之V光板之凹槽表面的凹面鏡，發光二極體所提供之 原除了因為被凹槽折射而改變其行進方向外，它們亦可 再-次地被這些形成於凹槽之表面的凹面鏡折射而到達本 創作之側光式背光模組之導光板的各個部分。意即，在本 創作之側光式背光模組令，發光二極體所提供之 ^至少兩次的「折射」，才會進人導光板内並分別_ 導f反的各個部分。因此’本創作之側光式背光模組相較 於白知之側光式背光模組而言，可更有效地改善「車頭燈 ，應」現象的發生並且可進—步地提昇其「外觀品味j 提南背光模組亮度的均一性。 而舉例而已，本創作所 圍所述為準，而非僅限 上述實施例僅係為了方便說明 主張之權利範圍自應以申請專利範 於上述實施例。The number of the guides of the edge-lit backlight module is determined by the number and shape of the H4 and the concave mirror 35 in the KJ mesh MW U plate==Fig. 3A and FIG. 3β, which also have different numbers and Different shapes. In practice, the number of concave mirrors 35 at each of the grooves '5:C surface 342 is preferably between 35 and :=: Γ to 45. In addition, when the "width of the groove 34" is between 25 and 3 times the "concave == degree", the effect of the "first headlight effect" of the second preferred embodiment of the present invention is overcome.佳,外: = = 乍 ί 乍 乍 乍 乍 乍 乍 乍 乍 乍 乍 乍 乍 乍 乍 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 15 20 2: Describe the 'concave mirrors provided on the groove surface of the V-light plate of the side-lighting backlight module of this creation. The original provided by the LED is changed by the refraction of the groove. Outside the direction, they can be refracted again by these concave mirrors formed on the surface of the groove to reach the respective portions of the light guide plate of the side-lit backlight module of the present invention. That is to say, in the side light-type backlight module of the present invention, at least two "refractions" provided by the light-emitting diodes are entered into the light guide plate and are respectively turned into opposite parts. Therefore, the side-lit backlight module of the present invention can more effectively improve the occurrence of the "headlights and should be" phenomenon and can further enhance its "appearance taste" compared with the optical backlight module of Baizhi. j The uniformity of the brightness of the tiara backlight module. The examples are only as described in the above, and the embodiments are not limited to the above-mentioned embodiments only for the convenience of the claims. .
II • M324222 【圖式簡單說明】 圖1係習知之側光式背光模組的立體示意圖。 圖2A係本創作第一較佳實施例之側光式背光模組的立體 5 示意圖。 圖2B係本創作第一較佳實施例之側光式背光模組所具之 凹槽的局部放大上視示意圖。II • M324222 [Simple Description of the Drawings] Figure 1 is a perspective view of a conventional edge-lit backlight module. 2A is a perspective view of a stereoscopic 5 of the edge-lit backlight module of the first preferred embodiment of the present invention. Fig. 2B is a partially enlarged plan view showing the groove of the edge-lit backlight module of the first preferred embodiment of the present invention.
圖3A係本創作第二較佳實施例之側光式背光模組的立體 示意圖。 a 10 圖3B係本創作第二較佳實施例之側光式背 凹槽的局部放大上視示意圖。 光模組所具之 【主要元件符號說明】 1側光式背光模組 112凹槽 2側光式背光模組 23出光面 25凹面鏡3A is a perspective view of the edge-lit backlight module of the second preferred embodiment of the present invention. a 10 Fig. 3B is a partially enlarged plan view showing the side light type back groove of the second preferred embodiment of the present invention. Optical module has [Main component symbol description] 1 side light backlight module 112 groove 2 side light backlight module 23 light surface 25 concave mirror
區域A 32入光面 341底面 3 6發光二極體 Π導光板 113表面 21導光板 24凹槽 26發光二極體 3側光式背光模組 33出光面 342表面 37反射片Area A 32 into the light surface 341 bottom surface 3 6 light emitting diode Π light guide 113 surface 21 light guide 24 groove 26 light emitting diode 3 side light backlight module 33 light surface 342 surface 37 reflective sheet
111 入光面 12 發光二極體 22 八光面 241 表面 27 反射片 31 導先板 34 四槽 35 四面鏡 區域B 12 15111 Light-in surface 12 Light-emitting diode 22 Octave 241 Surface 27 Reflector 31 Leading plate 34 Four-slot 35 Four-sided mirror Area B 12 15