201040584 六、發明說明： 【發明所屬之技術領域】 本發明是有關於一種光學鏡片，特別是指一種應用於 聚焦領域的光學鏡片。 【先前技術】 所謂的綠光雷射並沒有直接發綠光的雷射管，只能通 過晶體轉換，然後產生準直且聚焦良好的綠光，而一般綠 光所使用的晶體（Nd:YV04+KTP)是目前用於製作雷射二 〇 泵浦（LD )的全固態雷射器工作物質中最爲有效的雷射晶 體之一，其優良的性能中，包括穩定的化學和物理加工性 、較低雷射閾值、較大的受激發射截面、高斜率效率以及 寬帶的泵浦光吸收效率，從而使得Nd : YV04晶體得到了 • 越來越廣泛的應用。近來，該晶體通過和KTP晶體組合所 製作的咼功率、高穩定性的紅外和綠光雷射器已得到了工 業化生產和廣泛的市場應用。 KTP(磷酸氧鈦鉀）晶體則是目前眾多非線性晶體中综合 〇 性舱最好的晶體之一’其特性為較大的非線性係數，較高 的抗光損光損傷閾值及穩定化學特性極高的倍頻轉化效率 (>70%)和相對較低廉的價格，特別是在1〇64nm的雷射 倍頻器件的應用中，KTP是最好的晶體材料。 藉由綠光模組是由雷射晶體和非線性晶體結合在一起 ’因此’在雷射諧振腔中’利用808nm波長的LD泵浦光 經過雷射晶體（Nd:YV04)的增益作用生成1〇64nm的雷射， 再經過非線性晶體（ktp)的倍頻作用就可以產生532nm的綠 3 201040584 色雷射。綠光模組類似於電子元件中的積體電路，具有模 組化、集成化的特點，可以批量生産，降低成本。 參閱圖1，一個KTP晶體13是利用前方配置的一片第 透鏡11與片第一透鏡12，來供雷射透射而激發該ΚΤρ 晶體13以產生倍頻作用，而整體第-、二透鏡1卜12的設 计會丈到繞射極限（Diffracti〇n Limit)的限制，而且該第一、 透鏡11 12也都需要精準調校，也必須要製作出四個良 好精密的光學表面來供雷射光束射入射出，而且倘若第一 、二透鏡11、12之間產生傾斜，將非f難以保持低度像差 又為了控制第-、二透鏡u、12之間的組裝距離與傾斜 誤差，也會造成大量生產時之困難。 且 田於該第 、二透鏡11、12是間隔設置，所以 雷射光束會有在第—透鏡11中行進、在第：透鏡12中行進 ，以及在空氣中行進三種狀況，導致雷射光束產生四 折射而降低能量，經過實測之後可知，其第二透鏡12透射 ^的輸出雷射功率/雷射光源的輸心力率之百分比（簡 ^量轉換效率）是如下表所示： a 雷射光源的輸入功率 (mWatt 165.35 輸出雷射功率 (mWatt) 12 能量轉換效 171.41 171.93 172.34 168.04 172.41 3 78.09 145.35 139.29 148.58 144.02 146.15 143.43 --150.36 87.9% 81.3% 86.4% 83.6% 87.0% 83.2% 84.4% 耗损率 12·1〇% 18.74% 13.58% 16-43〇/0 13·〇3〇/0 16.8ι%1£^7〇/0 201040584 由上表可知該第一、二透鏡η、12所產生雷射的能量 轉換效率約在80〜90%之間，這樣的能量轉換效率明顯地 比較不足，使得雷射光束的訊號與強度愈來愈薄弱。 【發明内容】 因此，本發明之目的，即在提供一種光學鏡片，具有 易於組裝生產、能量轉換效率較高的優點。 於疋，本發明光學鏡片，用以使一雷射二極體所發出 的雷射光束予以產生聚焦，a光學鏡片包含一個鏡片本體 及刀別形成於該鏡片本體之兩相反側的一個第一傳送光 學凸面與一個第二傳送光學凸面。 其中，該第一傳送光學凸面是位於該鏡片本體之鄰近 於該雷射一極體的一側，並且供該雷射二極體所發出的雷 射光束通過，而轉換為於該鏡片本體内行進的平行雷射光 束，該第二傳送光學凸面則是位於該鏡片本體之遠離於該 雷射二極體的另一侧，並且供該鏡片本體内行進的平行雷 射光東所穿過’而轉換為收斂之聚焦雷射光束。 本發明的功效在於，藉由單一片光學鏡片本身所具有 、一、二傳送光學凸面，即可讓雷射光束於該鏡片本體 内形成準直光束的行進，之後從該鏡片本體射出時便產生 聚焦作用，無需如習知技術需依賴兩片鏡片方能達成；因 此零件數®從二減少至一，可以減輕生產線的組裝調校 而達到易於組裝生產的功效，另外，雷射光束的行進過程 中只有兩次的折射，也是少於習知技術的四次折射，所以 亦月b避免折射時的能量消耗而維持較高的能量轉換效率。 5 201040584 【實施方式】 有關本發明之前述及其他技術内容、特點與功效，在 以下配合參考圖式之兩個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明中’類似的元件是以相同的編號來表示。 參閱圖2 ’本發明光學鏡片2之第一較佳實施例，主要 是應用於光學技術領域，該光學鏡片2是設置在一雷射二 極體3與一光學碟片4之間，用以使該雷射二極體3所發 出的雷射光束予以產生聚焦在該光學碟片4上，詳細結構 係如下所述： 該光學鏡片2包含一個鏡片本體20,及分別形成於該 鏡片本體20之兩相反側的一個第一傳送光學凸面21與一 個第二傳送光學凸面22,該第一、二傳送光學凸面21、22 疋以該鏡片本體2 〇的中心軸線l為中心，呈完全對稱的設 計。 其中，該第一傳送光學凸面21是位於該鏡片本體2〇 之鄰近於忒雷射二極體3的一側，並且供該雷射二極體3 所發出的雷射光束通過，而轉換為於該鏡片本體内行進 的平行雷射光束；該第二傳送光學凸面22則是位於該鏡片 本體20之遠離於該雷射二極體3的另一側，並且供該鏡片 本體20内行進的平行雷射光束所穿過，轉換為收敛之聚 焦雷射光束。 當收斂之聚焦雷射光束照射在該光學碟片4上時該 201040584 光學碟片4會產生反射雷射光束，並反向地依序經由該第 =傳送光學凸面22的轉換平行光束作用、該鏡片本體2〇 的行進傳導作用、該第-傳送光學凸面21的㈣㈣作用 ’將反射雷射收斂，再㈣—半鏡5反射至一光 電信號處理單元6中來偵測像差。 藉此方式，即能達到基本的光學碟片功能，而且，由 於該光學鏡片2是應用在光學技術領域，因此，該第一、 二傳送光學凸面21、22的數值孔徑是設計為〇 3以上，特 〇 別是光學碟片4為CD片時，該第―、二傳送光學凸面21 、22的數值孔徑是設計為〇 38,如果光學碟片4是dvd片 時’則該第-、二傳送光學凸面21、22的數值孔徑是會設 计成兩達0.6。 申請人另外要強調的是，本發明光學鏡片2可以適用 於各種光學技術，並非單純只應用於光學碟片技術領域， 例如圖3所示的本發明光學鏡片2之第二較佳實施例其 是應用在晶體激發的技術領域，整體結構設計大致類似於 前述第一較佳實施例，不同的地方在於：該光學鏡片2是 认置於該雷射一極體3與一晶體7 (例如習知綠光模組所使 用的ktp晶體）之間，因此，當該雷射二極體3發出雷射 光束時，是經由該光學鏡片2而聚焦於該晶體7上使得 該晶體7是會被激發而運作。 其中’雷射光束的行進路徑就如同前述第一較佳實施 例所載，當從該第一傳送光學凸面21射入時，是於該鏡片 本體20内形成準直光束的行進，之後從該第二傳送光學凸 7 201040584 面22射出時便產生聚焦作用。 另外值得注意的是，該鏡片本體20於介於該第一、_ 傳送光學凸面21、22的兩相反侧，是分別向外延伸有: 保護部2〇1，且該二保護部2〇1的側緣與鏡 轴線L之間的距離D卜是大於該第…二傳送光學凸面中= 22與鏡片本體20中心軸線L之間的距離m，而所述保 護部加主要的目的是為了供鏡片座（圖未示）嵌設固定 ，另外也可以藉由該二保護部201的側緣突出距離D1較大 的設計，來使突出距離02較小的第一、二傳送光學凸面21 、22不會輕易碰觸到鏡片座或其他外部構件，以避免該第 一、二傳送光學凸面21、22受到磨擦而降低精密度。 雖然所述保護部201的設計是揭露於圖3所示之第二 較佳實施例中，但是實際上也可以應用在® 2所示之第-較佳實施例’同樣都可以達成供鏡片座嵌設固定與該第一 、二傳送光學凸面21、22避免受到磨擦等功效，因此，所 述保護部2G1的應用料實不應以本實施例之說明為限。 而申請人經過訾m參 不實驗的佐證（如下表所示），可以觀 察到能量轉換效率大約是在9〇〜95%之間，比起使用兩片 鏡片的先雨技術（能量轉換效率約在80〜90%之間）而言 ，是有著5〜10%的效率提升。 201040584 雷射光源的輸入功率 (mWatt) 161.25 165.20 157.38 160.96 151*50 161.87 165.49 j吏用本發明光片2 輪出雷射功率 (mWatt) 146.72 152.41 146.83 150.55 142.43 146.30 152.01 能量轉換效率 91.0% 92.3% 93.3% 93.5% 94*0% 90.4% 91.9% 耗损率 9.01% 7.74% 6.70% 6.47% 5.99% 9.62% 8-15%201040584 VI. Description of the Invention: [Technical Field] The present invention relates to an optical lens, and more particularly to an optical lens applied to a focusing field. [Prior Art] The so-called green laser does not have a direct green light. It can only be converted by crystal, and then produces collimated and well-focused green light, and the crystal used for general green light (Nd: YV04) +KTP) is one of the most effective laser crystals for the production of all-solid-state lasers for laser diode pumping (LD). Its excellent performance includes stable chemical and physical processing. The lower laser threshold, larger stimulated emission cross section, high slope efficiency, and broadband pump light absorption efficiency make Nd : YV04 crystals more and more widely used. Recently, the crystal has been industrially produced and widely used in the field of high power and high stability infrared and green lasers fabricated by combining with KTP crystals. KTP (potassium titanyl phosphate) crystal is one of the best crystals in the comprehensive bismuth chamber of many nonlinear crystals. Its characteristics are large nonlinear coefficient, high resistance to light damage and stable chemical properties. Extremely high frequency conversion efficiency (>70%) and relatively low price, especially in the application of 1〇64nm laser frequency doubling devices, KTP is the best crystalline material. The green light module is composed of a combination of a laser crystal and a nonlinear crystal, so 'in the laser cavity', the LD pump light of 808 nm wavelength is generated by the gain of the laser (Nd: YV04). A 〇64nm laser can be used to generate a 532nm Green 3 201040584 color laser after multiplication by a nonlinear crystal (ktp). The green light module is similar to the integrated circuit in electronic components. It has the characteristics of modularization and integration, which can be mass-produced and reduce costs. Referring to FIG. 1, a KTP crystal 13 is formed by a first lens 11 and a first lens 12 arranged in front for laser transmission to excite the ΚΤρ crystal 13 to generate a frequency doubling effect, and the overall first and second lenses 1b The design of 12 will limit the Diffracti〇n Limit, and the first, lens 11 12 also needs to be precisely adjusted. Four good precision optical surfaces must be produced for the laser. The beam is incident, and if the first and second lenses 11 and 12 are tilted, it is difficult for the non-f to maintain the low aberration and to control the assembly distance and the tilt error between the first and second lenses u and 12. It will cause difficulties in mass production. The fields and the second and second lenses 11, 12 are spaced apart, so that the laser beam travels in the first lens 11, travels in the first lens 12, and travels in the air, resulting in laser beam generation. The energy is reduced by four refractions. After the actual measurement, the output laser power of the second lens 12 and the percentage of the heart rate of the laser source (simplified conversion efficiency) are as follows: a Laser source Input power (mWatt 165.35 output laser power (mWatt) 12 Energy conversion efficiency 171.41 171.93 172.34 168.04 172.41 3 78.09 145.35 139.29 148.58 144.02 146.15 143.43 --150.36 87.9% 81.3% 86.4% 83.6% 87.0% 83.2% 84.4% Loss rate 12 ·1〇% 18.74% 13.58% 16-43〇/0 13·〇3〇/0 16.8ι%1£^7〇/0 201040584 From the above table, the laser generated by the first and second lenses η and 12 is known. The energy conversion efficiency is between 80 and 90%, and the energy conversion efficiency is obviously insufficient, so that the signal and intensity of the laser beam become weaker and weaker. [Invention] Therefore, the object of the present invention is to provide a Optical lens The utility model has the advantages of easy assembly and production and high energy conversion efficiency. The optical lens of the invention is used for focusing a laser beam emitted by a laser diode, and the optical lens comprises a lens body and a knife. a first transmitting optical convex surface and a second transmitting optical convex surface on opposite sides of the lens body, wherein the first transmitting optical convex surface is located on a side of the lens body adjacent to the laser body, and Passing a laser beam emitted by the laser diode to convert into a parallel laser beam traveling in the lens body, the second transmitting optical convex surface being located away from the laser diode The other side of the body, and the parallel laser light traveling through the lens body passes through 'to convert to a convergent focused laser beam. The effect of the present invention is that the single optical lens itself has one, By transmitting the optical convex surface, the laser beam can form a collimated light beam in the lens body, and then a focusing effect is generated when the lens body is emitted. For example, the conventional technology relies on two lenses to achieve; therefore, the number of parts is reduced from two to one, which can reduce the assembly adjustment of the production line and achieve the effect of easy assembly and production. In addition, the laser beam travels only twice. The refraction is also less than the four-order refraction of the prior art, so that the energy consumption during refraction is maintained to maintain high energy conversion efficiency. 5 201040584 [Embodiment] The foregoing and other technical contents and features of the present invention The details of the two preferred embodiments, which will be apparent from the following description of the drawings, will be apparent. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals. Referring to FIG. 2, a first preferred embodiment of the optical lens 2 of the present invention is mainly applied to the field of optical technology. The optical lens 2 is disposed between a laser diode 3 and an optical disc 4 for The laser beam emitted by the laser diode 3 is focused on the optical disc 4. The detailed structure is as follows: The optical lens 2 includes a lens body 20 and is formed on the lens body 20, respectively. a first transmitting optical convex surface 21 and a second transmitting optical convex surface 22 on opposite sides of the lens, the first and second transmitting optical convex surfaces 21, 22 are completely symmetrical around a central axis l of the lens body 2 〇 design. Wherein, the first transmitting optical convex surface 21 is located on a side of the lens body 2 adjacent to the 忒 laser diode 3, and the laser beam emitted by the laser diode 3 passes through, and is converted into a parallel laser beam traveling in the lens body; the second transmitting optical convex surface 22 is located on the other side of the lens body 20 away from the laser diode 3, and is provided for traveling in the lens body 20 The parallel laser beam passes through and is converted into a converging focused laser beam. When the focused focused laser beam is incident on the optical disc 4, the 201040584 optical disc 4 generates a reflected laser beam, and in turn reversely acts through the converted parallel beam of the third transmission optical convex surface 22, The traveling conduction effect of the lens body 2〇, the (four) (four) action of the first-transport optical convex surface 21 converges the reflected laser, and the (four)-half mirror 5 reflects into the photoelectric signal processing unit 6 to detect aberrations. In this way, the basic optical disc function can be achieved, and since the optical lens 2 is applied in the field of optical technology, the numerical apertures of the first and second transfer optical convex surfaces 21, 22 are designed to be 〇3 or more. When the optical disc 4 is a CD, the numerical aperture of the first and second transfer optical convex surfaces 21, 22 is designed as 〇38, and if the optical disc 4 is a dvd sheet, then the first and second The numerical apertures of the transmitting optical convex surfaces 21, 22 are designed to be two up to 0.6. The Applicant further emphasizes that the optical lens 2 of the present invention can be applied to various optical technologies, and is not simply applied to the field of optical disc technology, such as the second preferred embodiment of the optical lens 2 of the present invention shown in FIG. It is applied in the technical field of crystal excitation, and the overall structural design is substantially similar to the first preferred embodiment described above, except that the optical lens 2 is disposed on the laser body 3 and a crystal 7 (for example, Between the ktp crystals used by the green light module, therefore, when the laser diode 3 emits a laser beam, it is focused on the crystal 7 via the optical lens 2 so that the crystal 7 is to be Inspire and operate. Wherein the path of the 'laser beam' is as described in the first preferred embodiment above, and when incident from the first transmitting optical convex surface 21, a path of collimating light beam is formed in the lens body 20, after which The second transfer optical projection 7 201040584 produces a focusing effect when the surface 22 is ejected. It is also noted that the lens body 20 extends outwardly from opposite sides of the first, _ transmitting optical convex surfaces 21, 22, respectively: a protection portion 2〇1, and the two protection portions 2〇1 The distance D between the side edge and the mirror axis L is greater than the distance m between the second transmission optical convex surface = 22 and the central axis L of the lens body 20, and the main purpose of the protection portion is to The lens holder (not shown) is embedded and fixed, and the first and second conveying optical convex surfaces 21 having a small protruding distance 02 can be made by the design that the side edge protruding distance D1 of the two protecting portions 201 is large. 22 does not easily touch the lens holder or other external components to prevent the first and second transfer optical convex surfaces 21, 22 from being rubbed to reduce precision. Although the design of the protection portion 201 is disclosed in the second preferred embodiment shown in FIG. 3, it can be applied to the lens holder as well as the first preferred embodiment shown in FIG. The embedded fixing and the first and second transmitting optical convex surfaces 21 and 22 are protected from friction and the like. Therefore, the application of the protecting portion 2G1 should not be limited to the description of the embodiment. The applicant's evidence of 訾m's non-experiment (as shown in the table below) shows that the energy conversion efficiency is between 9〇~95%, compared to the first rain technique using two lenses (energy conversion efficiency is about In the case of 80 to 90%), there is a 5 to 10% efficiency improvement. 201040584 Input power of laser source (mWatt) 161.25 165.20 157.38 160.96 151*50 161.87 165.49 j吏Using the light sheet of the invention 2 Round laser power (mWatt) 146.72 152.41 146.83 150.55 142.43 146.30 152.01 Energy conversion efficiency 91.0% 92.3% 93.3 % 93.5% 94*0% 90.4% 91.9% Loss rate 9.01% 7.74% 6.70% 6.47% 5.99% 9.62% 8-15%
承上所述，本發明光學鏡片2，在實際使用上會有以 下所述之優點： (1)容易組裝，節省空間： 本發明只要藉由單-片光學鏡片2本身所具有的 二片本送光學凸面21、22’即可讓雷射光束於該 2〇内形成準直光束的行進，之後從該鏡片本 體〇射出時便產生聚焦作用， ，，，、累如^知技術需依賴 兩片鏡片方能達成；因此，零件數量從 ;以減輕生產線的組裝調校而達到易於組裝生產的功 當薄，並非f Λ w序厪相 立非各知技術之兩片間隔設置的鏡片還 “距離，所以本發明料&丨、自t 盥…b 月特別適用於光學讀寫這種構件 ::::白是相當精密微小的技術領域，可以 郎^安裝空fa1、縮小讀寫頭設計等等功效。 ， (2)高能量轉換效率： 201040584 由於本發明之光學鏡片2只有第一、二傳迭光學 凸面2卜22這兩個光學表面’所以在雷射光束的行: 過程中只會有兩次的折射，相較於習知技術使用了兩 片鏡片’所以有四個光學表面，相對應地就會產生四 次折射，相較之下，本發明之光學鏡4 2㈣次折射 是習知技術四次折射的一半，所以確實能避免折射時 的能量消耗而維持較高的能量轉換效率。 再者，由於本發明之鏡片本體2〇是均勻材質所 以準直雷射光束於該鏡片本體2G行進時是不易發生擾 動現象的，而習知技術之兩片鏡片間是存在空氣而 空氣並非均勻的介質，因此準直雷射光束於空氣中行 進時是容易有擾動現象的，所以本發明之光學鏡片2 確實也可以有效避免發生擾動現象而達到維持高能量 轉換效率的功效。 (3)降低產生組裝辨識困擾與減少模仁備料種類： 本發明藉由該第-、二傳送光學凸面21、22是以 該鏡片本體20的中心軸線L為中心，呈完全對稱的設 叶，所以可以降低產生組裝辨識困擾，不需刻意對準 該第一 '二傳送光學凸面21、22才能加以安裝；另外 ，於製作該光學鏡片2時也無需準備兩種不同的光學 輪廓模仁，只要準備單一種模仁備料即可。 (4)無需精準控制鏡片厚度： 習知技術之兩片鏡片必須要精準控制距離，才能 使準直雷射光束可㈣免空氣擾動的料而保持低度 10 201040584 像差，反觀本發明之準直雷射光束是在均勻介質的鏡 片本體20中行進，所以即使鏡片厚度設計得較為寬鬆 ，也不會有空氣擾動的不易影響，而且也可以使該光 學鏡片2的徑薄比值範圍甚大而有利於射出成型參數 調校控制。 综上所述’本發明光學鏡片2,不論是應用在光學讀寫 或是晶體激發的技術領域，都因為該光學鏡片2本身所直 接成型的第一、一傳送光學凸面21、22，來減少鏡片使用 〇 數量以達到易於組裝生產、節省空間、高能量轉換效率的 功效；再者，由於該鏡片本體20是均勻介質，所以鏡片厚 度的影響並不大；另外，該第一、二傳送光學凸面21、22 是以該鏡片本體20的中心軸線L為中心，呈完全對稱的設 ‘計，亦能降低產生組裝辨識困擾與減少模仁備料種類，所 以確實能達到本發明之目的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 此以此限定本發明實施之範圍，即大凡依本發明申請專利 ❹ _及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。 【圖式簡單說明】 圖1是一雷射光束行進路徑示意圖，說明習知κτρ晶 體與第-、二透鏡的對應結構關係； 圖2疋一雷射光束行進路徑示意圖，說明本發明光學 鏡片之第一較佳實施例，應用於光學技術領域的整體結構 δ免计；及 11 201040584 圖3是一雷射光束行進路徑示意圖，說明本發明光學 鏡片之第二較佳實施例，應用於晶體激發領域的整體結構 設計。 12 201040584 【主要元件符號說明】 2 光學鏡片 4 光學碟片 20 鏡片本體 5 半鏡 201 保護部 6 光電信號處理單 21 第一傳送光學凸 元 面 7 晶體 22 第二傳送光學凸 L 中心軸線 面 Dl、D2 距離 3 雷射二極體As described above, the optical lens 2 of the present invention has the following advantages in practical use: (1) Easy assembly and space saving: The present invention is only required to have a two-piece copy of the single-plate optical lens 2 itself. Sending the optical convex surfaces 21, 22' allows the laser beam to form a collimated beam of light within the two turns, and then a focusing effect is generated when the lens body is ejected from the lens body, and the technique is dependent on two The lens can be achieved; therefore, the number of parts is changed from the assembly adjustment of the production line to the ease of assembly and production, and it is not the case that the two lenses are arranged at the same time. Distance, so the invention material & 丨, from t 盥 ... b month is particularly suitable for optical reading and writing of such components:::: white is quite a small and precise technical field, you can install empty fa1, reduce the head design (2) High energy conversion efficiency: 201040584 Since the optical lens 2 of the present invention has only two optical surfaces of the first and second overlapping optical convex surface 2b 22, so in the line of the laser beam: only in the process There will be two refractions, phase Two lenses are used than in the prior art' so there are four optical surfaces, correspondingly producing four refractions. In contrast, the optical mirror of the present invention has a fourth refraction of four times. Half, so it is possible to avoid energy consumption during refraction and maintain high energy conversion efficiency. Furthermore, since the lens body 2〇 of the present invention is a uniform material, the collimated laser beam is less likely to occur when traveling on the lens body 2G. Disturbing phenomenon, while the two lenses of the prior art are air and air is not uniform medium, so the collimated laser beam is easy to be disturbed when traveling in the air, so the optical lens 2 of the present invention does It can effectively avoid the occurrence of disturbance and achieve the effect of maintaining high energy conversion efficiency. (3) Reducing the problem of generating assembly identification and reducing the type of mold preparation: The present invention uses the first and second transmission optical convex surfaces 21, 22 to be the lens The central axis L of the body 20 is centered and is completely symmetrically set, so that the assembly identification problem can be reduced, and the first 'second pass' is not deliberately aligned. The optical convex surfaces 21, 22 can be installed; in addition, it is not necessary to prepare two different optical contour molds when manufacturing the optical lens 2, as long as a single mold core preparation is prepared. (4) There is no need to precisely control the lens thickness: It is necessary to accurately control the distance between the two lenses of the technology, so that the collimated laser beam can be kept at a low level by the air-disturbing material. 201040584 Aberration, in contrast, the collimated laser beam of the present invention is a lens in a uniform medium. The body 20 travels, so even if the lens thickness is designed to be loose, there is no air disturbance, and the optical lens 2 can be made to have a large range of diameter ratios, which is advantageous for the injection molding parameter adjustment control. The optical lens 2 of the present invention, whether applied to the technical field of optical reading or writing or crystal excitation, reduces the use of the lens by the first optical lens 21, 22 directly formed by the optical lens 2 itself. 〇 the number to achieve easy assembly production, space saving, high energy conversion efficiency; further, because the lens body 20 is a uniform medium Therefore, the influence of the thickness of the lens is not large; in addition, the first and second transmitting optical convex surfaces 21, 22 are completely symmetrically centered on the central axis L of the lens body 20, and can also reduce assembly and identification problems. It is possible to achieve the object of the present invention by reducing the type of preparation of the mold. However, the above is only the preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent change of the patent application and the description of the invention is Modifications are still within the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of a laser beam travel path illustrating the corresponding structural relationship between a conventional κτρ crystal and a first and second lens; FIG. 2 is a schematic diagram of a laser beam travel path illustrating the optical lens of the present invention. The first preferred embodiment is applied to the overall structure δ exemption in the field of optical technology; and 11 201040584 FIG. 3 is a schematic diagram of a laser beam travel path illustrating a second preferred embodiment of the optical lens of the present invention applied to crystal excitation The overall structural design of the field. 12 201040584 [Description of main component symbols] 2 Optical lens 4 Optical disc 20 Lens body 5 Half mirror 201 Protection part 6 Photoelectric signal processing sheet 21 First transmission optical convex surface 7 Crystal 22 Second transmission optical convex L Center axis surface Dl , D2 distance 3 laser diode
1313