TWI814018B - Fixed-focus projection lens - Google Patents

Fixed-focus projection lens Download PDF

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Publication number
TWI814018B
TWI814018B TW110122472A TW110122472A TWI814018B TW I814018 B TWI814018 B TW I814018B TW 110122472 A TW110122472 A TW 110122472A TW 110122472 A TW110122472 A TW 110122472A TW I814018 B TWI814018 B TW I814018B
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Taiwan
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lens
fixed
lens group
focus projection
projection lens
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TW110122472A
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Chinese (zh)
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TW202300979A (en
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李明燐
陳信德
張碩傑
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揚明光學股份有限公司
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Priority to TW110122472A priority Critical patent/TWI814018B/en
Priority to CN202110881476.0A priority patent/CN115494686A/en
Priority to JP2021139081A priority patent/JP2023000974A/en
Publication of TW202300979A publication Critical patent/TW202300979A/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/142—Adjusting of projection optics
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/008—Projectors using an electronic spatial light modulator but not peculiar thereto using micromirror devices

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

A fixed-focus projection lens includes a first lens group and a second lens group. The first lens group and the second lens group are separated by a minimum inner diameter position (aperture) of the barrel. The first lens group includes 6 to 8 lenses having refractive power and includes at least two aspheric lens surfaces. The refractive power of the second lens group is positive. The second lens group includes 5 to 8 lenses having refractive power and includes two cemented surfaces, and the lenses having refractive power are spherical lenses.

Description

定焦投影鏡頭fixed focus projection lens

本發明是有關於一種光學鏡頭，且特別是有關於一種定焦投影鏡頭。 The present invention relates to an optical lens, and in particular to a fixed focus projection lens.

投影鏡頭可將來自光閥的影像光束投影至投影目標。使用廣角投影鏡頭可以有效縮短投影目標與投影裝置之間的距離。然而，廣角投影鏡頭所衍生出的像差，如畸變(Distortion)、場曲(Field Curvature)、像散(Astigmatism)等，皆是目前廣角投影鏡設計上必須面對的難題。 The projection lens projects the image beam from the light valve to the projection target. Using a wide-angle projection lens can effectively shorten the distance between the projection target and the projection device. However, aberrations derived from wide-angle projection lenses, such as distortion, field curvature, astigmatism, etc., are all problems that must be faced in the current design of wide-angle projection lenses.

一般廣角投影鏡頭為了要達到色差小、低畸變的需求，系統總長較長，且鏡片數較多，除增加成本與製造難度，該等鏡頭也難以達成輕量化、小型化的產品需求。 In order to achieve the requirements of small chromatic aberration and low distortion, generally wide-angle projection lenses have a longer total system length and a larger number of lenses. In addition to increasing costs and manufacturing difficulties, these lenses are also difficult to meet the requirements for lightweight and compact products.

本發明提供一種定焦投影鏡頭，可在系統總長限制的情況下，維持良好的影像品質。 The present invention provides a fixed-focus projection lens that can maintain good image quality under the condition that the total length of the system is limited.

本發明的一種定焦投影鏡頭包括第一透鏡組及第二透鏡 組，第一透鏡組與第二透鏡組以鏡筒內徑最小位置(光闌aperture)區隔，且第一透鏡組與第二透鏡組自放大側到縮小側在光軸上依序排列。其中，第一透鏡組包含6至8片具有屈光度的透鏡且包括二個非球面透鏡表面。第二透鏡組的屈光度為正，第二透鏡組包含5至8片具有屈光度的透鏡且包括二個膠合面，且前述具有屈光度的透鏡皆為球面透鏡。且定焦投影鏡頭滿足下列條件：0.6<D1/OAL1<0.8。其中，D1為定焦投影鏡頭自放大側數來的第一片透鏡的直徑，OAL1為定焦投影鏡頭兩端的最外側透鏡表面之間的最短距離。 A fixed-focus projection lens of the present invention includes a first lens group and a second lens The first lens group and the second lens group are separated by the minimum inner diameter position of the lens barrel (aperture), and the first lens group and the second lens group are arranged sequentially on the optical axis from the magnification side to the reduction side. Wherein, the first lens group includes 6 to 8 lenses with diopter and includes two aspherical lens surfaces. The refractive power of the second lens group is positive, and the second lens group includes 5 to 8 lenses with refractive power and two cemented surfaces, and the aforementioned lenses with refractive power are all spherical lenses. And the fixed focus projection lens meets the following conditions: 0.6<D1/OAL1<0.8. Among them, D1 is the diameter of the first lens of the fixed-focus projection lens from the magnification side, and OAL1 is the shortest distance between the outermost lens surfaces at both ends of the fixed-focus projection lens.

本發明的一種定焦投影鏡頭包括第一透鏡組、第二透鏡組和第三透鏡組，第一透鏡組、第二透鏡組和第三透鏡組自放大側到縮小側在光軸上依序排列，且第一透鏡組和第三透鏡組為固定透鏡組，第二透鏡組為可動透鏡組。其中，定焦投影鏡頭的鏡筒內徑最小位置設置於第二透鏡組至第三透鏡組最外側透鏡之間。第一透鏡組包括兩個非球面透鏡表面。第三透鏡組包含6至9片具有屈光度的透鏡，且前述具有屈光度的透鏡皆為球面鏡片，且第三透鏡組包括兩對相鄰透鏡表面共兩處，其中每處的兩對相鄰透鏡表面各自符合以下條件：相鄰透鏡表面之間的曲率半徑差與相鄰透鏡表面中較大曲率半徑的比值<0.01。且定焦投影鏡頭總共包含11至16片具有屈光度的透鏡，且定焦投影鏡頭滿足下列條件：2<D1/DL<4。其中，D1為定焦投影鏡頭自放大側數來的第一片透鏡的直徑，DL為定焦投影鏡頭自放大側數來的 最後一片透鏡的直徑。 A fixed-focus projection lens of the present invention includes a first lens group, a second lens group and a third lens group. The first lens group, the second lens group and the third lens group are arranged in sequence on the optical axis from the magnification side to the reduction side. Arranged, the first lens group and the third lens group are fixed lens groups, and the second lens group is a movable lens group. Wherein, the minimum inner diameter position of the lens barrel of the fixed focus projection lens is disposed between the outermost lenses of the second lens group to the third lens group. The first lens group includes two aspherical lens surfaces. The third lens group includes 6 to 9 lenses with refractive power, and the aforementioned lenses with refractive power are all spherical lenses, and the third lens group includes two pairs of adjacent lens surfaces at two locations, with two pairs of adjacent lenses at each location. The surfaces each meet the following condition: the ratio of the difference in radii of curvature between adjacent lens surfaces to the larger radius of curvature in adjacent lens surfaces is <0.01. And the fixed-focus projection lens contains a total of 11 to 16 lenses with diopter, and the fixed-focus projection lens meets the following conditions: 2<D1/DL<4. Among them, D1 is the diameter of the first lens of the fixed-focus projection lens from the magnification side, and DL is the diameter of the fixed-focus projection lens from the magnification side. The diameter of the last lens.

本發明的一種定焦投影鏡頭包括11至15片具有屈光度的透鏡及光闌(aperture)。其中前述透鏡自放大側到縮小側在光軸上依序排列為固定的第一透鏡組、可動的第二透鏡組和固定的第三透鏡組。光闌設置於第二透鏡組中自放大側數來的最後一片透鏡到第三透鏡組中自放大側數來的最後一片透鏡之間。第一透鏡組包括兩個非球面透鏡表面。第三透鏡組包含6至9片具有屈光度的透鏡，第三透鏡組中包括兩對相鄰透鏡表面，其中兩對相鄰透鏡表面形狀實質對應的透鏡組合。且定焦投影透鏡滿足以下二個條件：(1)2<D1/DL<4；及(2)0.06<TH23/OAL2<0.32。其中，D1為定焦投影鏡頭自放大側數來的第一片透鏡的直徑，DL為定焦投影鏡頭自放大側數來的最後一片透鏡的直徑，TH23為第二透鏡組到第三透鏡組之間的最短距離，OAL2為定焦投影鏡頭兩端的最外側透鏡表面之間在光軸上的距離。 A fixed-focus projection lens of the present invention includes 11 to 15 lenses with diopter and an aperture. The aforementioned lenses are arranged sequentially on the optical axis from the magnification side to the reduction side as a fixed first lens group, a movable second lens group and a fixed third lens group. The diaphragm is disposed between the last lens from the magnification side in the second lens group to the last lens from the magnification side in the third lens group. The first lens group includes two aspherical lens surfaces. The third lens group includes 6 to 9 lenses with diopter, and the third lens group includes two pairs of adjacent lens surfaces, wherein the shapes of the two pairs of adjacent lens surfaces are substantially corresponding lens combinations. And the fixed-focus projection lens meets the following two conditions: (1) 2<D1/DL<4; and (2) 0.06<TH23/OAL2<0.32. Among them, D1 is the diameter of the first lens of the fixed-focus projection lens from the magnification side, DL is the diameter of the last lens of the fixed-focus projection lens from the magnification side, and TH23 is the second to third lens groups. The shortest distance between them, OAL2, is the distance on the optical axis between the outermost lens surfaces at both ends of a fixed-focus projection lens.

基於上述，本發明的實施例的定焦投影鏡頭，依據定焦投影鏡頭中各光學元件的整體配置，可以在系統總長限制的情況下，維持良好的影像品質。 Based on the above, the fixed-focus projection lens according to the embodiment of the present invention, according to the overall configuration of each optical element in the fixed-focus projection lens, can maintain good image quality under the limitation of the total system length.

0:光闌 0: aperture

1:第一透鏡 1: First lens

2:第二透鏡 2: Second lens

3:第三透鏡 3:Third lens

4:第四透鏡 4:Fourth lens

5:第五透鏡 5:Fifth lens

6:第六透鏡 6:Sixth lens

7:第七透鏡 7:Seventh lens

8:第八透鏡 8:Eighth lens

9:第九透鏡 9:Ninth lens

10:第十透鏡 10: Tenth lens

11:第十一透鏡 11:Eleventh lens

12:第十二透鏡 12:Twelfth lens

13:第十三透鏡 13: Thirteenth lens

14:第十四透鏡 14: Fourteenth lens

A1:放大側 A1: Magnification side

A2:縮小側 A2: Reduced side

C1:第一平板 C1: First plate

C2:第二平板 C2: Second plate

C3:第三平板 C3: The third plate

E:光閥 E: light valve

G1:第一透鏡組 G1: First lens group

G2:第二透鏡組 G2: Second lens group

Grp1:第一透鏡組 Grp1: first lens group

Grp2:第二透鏡組 Grp2: Second lens group

Grp3:第三透鏡組 Grp3: Third lens group

I:光軸 I: optical axis

PL:定焦投影鏡頭 PL: fixed focus projection lens

S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16、S17、S18、S19、S20、S21、S22、S23、S24、S25、S26、S27、S28、S29、S30、S31、S32:面 S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23, S24, S25, S26, S27, S28, S29, S30, S31, S32: side

圖1至圖5為本發明的第一實施例至第五實施例的定焦投影鏡頭的示意圖。 1 to 5 are schematic diagrams of fixed focus projection lenses according to the first to fifth embodiments of the present invention.

圖6A、圖6B至圖16A、圖16B為本發明的第六實施例至第十六實施例的定焦投影鏡頭的示意圖以及詳細光學數據。 6A, 6B to 16A and 16B are schematic diagrams and detailed optical data of fixed-focus projection lenses according to the sixth to sixteenth embodiments of the present invention.

圖1為本發明的第一實施例的定焦投影鏡頭PL的示意圖。請先參照圖1，本發明的第一實施例的定焦投影鏡頭PL包括第一透鏡組G1及第二透鏡組G2。第一透鏡組G1與第二透鏡組G2自放大側A1到縮小側A2在光軸I上依序排列。其中，第一透鏡組G1與第二透鏡組G2以鏡筒內徑最小位置S12(即光闌0所在位置)區隔。第一透鏡組G1包含6至8片具有屈光度的透鏡且包括至少二個非球面透鏡表面。在本實施例中，第一透鏡組G1包含6片具有屈光度的透鏡，自放大側A1到縮小側A2依序包括第一透鏡1、第二透鏡2、第三透鏡3、第四透鏡4、第五透鏡5和第六透鏡6，其中包括四個非球面透鏡表面S1、S2、S3、S4。在另一實施例中，也可以將非球面透鏡的第一透鏡1改以1片非球面透鏡和1片球面透鏡取代，此時，第一透鏡組G1包含7片具有屈光度的透鏡。在另一實施例中，也可以將非球面透鏡的第一透鏡1和第二透鏡2分別改以1片非球面透鏡和1片球面透鏡取代，此時，第一透鏡組G1包含8片具有屈光度的透鏡。 FIG. 1 is a schematic diagram of a fixed-focus projection lens PL according to the first embodiment of the present invention. Please refer to FIG. 1 . A fixed-focus projection lens PL according to the first embodiment of the present invention includes a first lens group G1 and a second lens group G2. The first lens group G1 and the second lens group G2 are sequentially arranged on the optical axis I from the magnification side A1 to the reduction side A2. Among them, the first lens group G1 and the second lens group G2 are separated by the minimum inner diameter position S12 of the lens barrel (ie, the position of the aperture 0). The first lens group G1 includes 6 to 8 lenses with refractive power and includes at least two aspherical lens surfaces. In this embodiment, the first lens group G1 includes 6 lenses with diopter, including the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, in order from the magnification side A1 to the reduction side A2. The fifth lens 5 and the sixth lens 6 include four aspherical lens surfaces S1, S2, S3, and S4. In another embodiment, the first lens 1 of the aspherical lens can also be replaced by an aspherical lens and a spherical lens. In this case, the first lens group G1 includes 7 lenses with diopter. In another embodiment, the first lens 1 and the second lens 2 of the aspherical lens can also be replaced by one aspherical lens and one spherical lens respectively. In this case, the first lens group G1 includes 8 lenses with diopter lens.

詳細而言，第一透鏡1為塑膠鏡片且為非球面透鏡。第一透鏡1的屈光度為負。第二透鏡2為塑膠鏡片且為非球面透鏡。第二透鏡2的屈光度為正。 Specifically, the first lens 1 is a plastic lens and an aspherical lens. The refractive power of the first lens 1 is negative. The second lens 2 is a plastic lens and an aspherical lens. The refractive power of the second lens 2 is positive.

第三透鏡3為玻璃鏡片且為球面透鏡。第三透鏡3的屈光度為負且為凸凹透鏡，其中第三透鏡3中朝向放大側A1的放大側表面S5為凸面，朝向縮小側A2的縮小側表面S6為凹面，且表面S5、S6為球面透鏡表面。 The third lens 3 is a glass lens and a spherical lens. The third lens 3 has negative refractive power and is a convex-concave lens. The magnification side surface S5 of the third lens 3 facing the magnification side A1 is convex, the reduction side surface S6 facing the reduction side A2 is a concave surface, and the surfaces S5 and S6 are spherical surfaces. lens surface.

第四透鏡4為玻璃鏡片且為球面透鏡。第四透鏡4的屈光度為負且為雙凹透鏡，其中第四透鏡4中朝向放大側A1的放大側表面S7為凹面，朝向縮小側A2的縮小側表面S8為凹面，且表面S7、S8為球面透鏡表面。 The fourth lens 4 is a glass lens and a spherical lens. The fourth lens 4 has negative refractive power and is a biconcave lens. The magnification side surface S7 of the fourth lens 4 facing the magnification side A1 is concave, the reduction side surface S8 facing the reduction side A2 is a concave surface, and the surfaces S7 and S8 are spherical surfaces. lens surface.

第五透鏡5為玻璃鏡片且為球面透鏡。第五透鏡5的屈光度為負且為雙凹透鏡。第六透鏡6為玻璃鏡片且為球面透鏡。第六透鏡6的屈光度為正且為雙凸透鏡。第五透鏡5和第六透鏡6在膠合面S10上接合成雙膠合透鏡。第五透鏡5中朝向放大側A1的放大側表面S9為凹面，第六透鏡6中朝向縮小側A2的縮小側表面S11為凸面，且表面S9、S10、S11為球面透鏡表面。 The fifth lens 5 is a glass lens and a spherical lens. The fifth lens 5 has negative refractive power and is a biconcave lens. The sixth lens 6 is a glass lens and a spherical lens. The sixth lens 6 has positive refractive power and is a biconvex lens. The fifth lens 5 and the sixth lens 6 are joined on the cementing surface S10 to form a double cemented lens. The magnification side surface S9 of the fifth lens 5 facing the magnification side A1 is a concave surface, the reduction side surface S11 of the sixth lens 6 facing the reduction side A2 is a convex surface, and the surfaces S9, S10, and S11 are spherical lens surfaces.

第二透鏡組G2的屈光度為正。第二透鏡組G2包含5至8片具有屈光度的透鏡，且該些具有屈光度的透鏡皆為球面透鏡。在本實施例中，第二透鏡組G2包含7片具有屈光度的透鏡，自放大側A1到縮小側A2依序包括第七透鏡7、第八透鏡8、第九透鏡9、第十透鏡10、第十一透鏡11、第十二透鏡12和第十三透鏡13，其中第七透鏡7至第十三透鏡13皆為球面透鏡。在另一實施例中，也可以將球面透鏡的第七透鏡7改以2片球面透鏡取代，此時，第二透鏡組G2包含8片具有屈光度的透 鏡。第二透鏡組G2包括至少二個膠合面。在本實施例中，第二透鏡組G2包括三個膠合面S16、S17、S20。第二透鏡組G2中包含至少4片正屈光度透鏡(包括單一鏡片的正屈光度透鏡以及膠合鏡片中的正屈光度透鏡)。在本實施例中，第二透鏡組G2中包含4片正屈光度透鏡。 The refractive power of the second lens group G2 is positive. The second lens group G2 includes 5 to 8 lenses with refractive power, and these lenses with refractive power are all spherical lenses. In this embodiment, the second lens group G2 includes 7 lenses with diopter, including the seventh lens 7 , the eighth lens 8 , the ninth lens 9 , the tenth lens 10 , in order from the magnification side A1 to the reduction side A2 . The eleventh lens 11, the twelfth lens 12 and the thirteenth lens 13, among which the seventh lens 7 to the thirteenth lens 13 are all spherical lenses. In another embodiment, the seventh lens 7 of the spherical lens can also be replaced by two spherical lenses. In this case, the second lens group G2 includes 8 lenses with diopter. Mirror. The second lens group G2 includes at least two glued surfaces. In this embodiment, the second lens group G2 includes three glued surfaces S16, S17, and S20. The second lens group G2 includes at least 4 positive refractive power lenses (including positive refractive power lenses in single lenses and positive refractive power lenses in cemented lenses). In this embodiment, the second lens group G2 includes four lenses with positive refractive power.

詳細而言，第七透鏡7為玻璃鏡片且為球面透鏡。第七透鏡7的屈光度為正且為凹凸透鏡，其中第七透鏡7中朝向放大側A1的放大側表面S13為凸面，朝向縮小側A2的縮小側表面S14為凹面，且表面S13、S14為球面透鏡表面。 Specifically, the seventh lens 7 is a glass lens and a spherical lens. The seventh lens 7 has positive refractive power and is a meniscus lens. The magnification side surface S13 of the seventh lens 7 facing the magnification side A1 is convex, the reduction side surface S14 facing the reduction side A2 is a concave surface, and the surfaces S13 and S14 are spherical surfaces. lens surface.

第八透鏡8為玻璃鏡片且為球面透鏡。第八透鏡8的屈光度為負且為凸凹透鏡。第九透鏡9為玻璃鏡片且為球面透鏡。第九透鏡9的屈光度為正且為雙凸透鏡。第十透鏡10玻璃鏡片且為球面透鏡。第十透鏡10的屈光度為負且為凸凹透鏡。第八透鏡8和第九透鏡9在膠合面S16上接合且第九透鏡9和第十透鏡10在膠合面S17上接合形成三膠合透鏡。第八透鏡8中朝向放大側A1的放大側表面S15為凸面，第十透鏡10中朝向縮小側A2的縮小側表面S18為凸面，且表面S15、S16、S17、S18為球面透鏡表面。 The eighth lens 8 is a glass lens and a spherical lens. The eighth lens 8 has negative refractive power and is a convex-concave lens. The ninth lens 9 is a glass lens and a spherical lens. The ninth lens 9 has positive refractive power and is a biconvex lens. The tenth lens 10 is a glass lens and is a spherical lens. The tenth lens 10 has negative refractive power and is a convex-concave lens. The eighth lens 8 and the ninth lens 9 are joined on the cementing surface S16 and the ninth lens 9 and the tenth lens 10 are joined on the cementing surface S17 to form a triple cemented lens. The magnification side surface S15 of the eighth lens 8 facing the magnification side A1 is a convex surface, the reduction side surface S18 of the tenth lens 10 facing the reduction side A2 is a convex surface, and the surfaces S15, S16, S17, and S18 are spherical lens surfaces.

第十一透鏡11為玻璃鏡片且為球面透鏡。第十一透鏡11的屈光度為正且為雙凸透鏡。第十二透鏡12為玻璃鏡片且為球面透鏡。第十二透鏡12的屈光度為負且為凸凹透鏡。第十一透鏡11和第十二透鏡12在膠合面S20上接合成雙膠合透鏡。第 十一透鏡11中朝向放大側A1的放大側表面S19為凸面，第十二透鏡12中朝向縮小側A2的縮小側表面S21為凸面，且表面S19、S20、S21為球面透鏡表面。 The eleventh lens 11 is a glass lens and a spherical lens. The eleventh lens 11 has positive refractive power and is a biconvex lens. The twelfth lens 12 is a glass lens and a spherical lens. The twelfth lens 12 has negative refractive power and is a convex-concave lens. The eleventh lens 11 and the twelfth lens 12 are joined on the cementing surface S20 to form a double cemented lens. No. The magnification side surface S19 of the eleventh lens 11 facing the magnification side A1 is a convex surface, the reduction side surface S21 of the twelfth lens 12 facing the reduction side A2 is a convex surface, and the surfaces S19, S20 and S21 are spherical lens surfaces.

第十三透鏡13為玻璃鏡片且為球面透鏡。第十三透鏡13的屈光度為正且為雙凸透鏡，其中第十三透鏡13中朝向放大側A1的放大側表面S22為凸面，朝向縮小側A2的縮小側表面S23為凸面，且表面S22、S23為球面透鏡表面。 The thirteenth lens 13 is a glass lens and a spherical lens. The refractive power of the thirteenth lens 13 is positive and is a biconvex lens. The magnification side surface S22 of the thirteenth lens 13 facing the magnification side A1 is a convex surface, the reduction side surface S23 facing the reduction side A2 is a convex surface, and the surfaces S22 and S23 is the spherical lens surface.

在本實施例中，第一透鏡1的朝向放大側A1的放大側表面S1、朝向縮小側A2的縮小側表面S2、第二透鏡2的朝向放大側A1的放大側表面S3、朝向縮小側A2的縮小側表面S4均是非球面(aspheric surface)，而這些非球面是依下列公式定義：

Figure 110122472-A0305-02-0010-1
其中：R：透鏡表面近光軸I處的曲率半徑；Y：非球面曲面上的點與光軸I的垂直距離；Z：非球面之深度(非球面上距離光軸I為Y的點，其與相切於非球面光軸I上頂點之切面，兩者間的垂直距離)；K：錐面係數(conic constant)；a2i：第2i階非球面係數。 In this embodiment, the magnification side surface S1 of the first lens 1 faces the magnification side A1, the reduction side surface S2 faces the reduction side A2, the magnification side surface S3 of the second lens 2 faces the magnification side A1, and the reduction side surface S2 faces the reduction side A2. The reduced side surfaces S4 are all aspheric surfaces, and these aspheric surfaces are defined according to the following formula:
Figure 110122472-A0305-02-0010-1
 Among them: R: the radius of curvature of the lens surface at the paraxial axis I; Y: the perpendicular distance between a point on the aspheric surface and the optical axis I; Z: the depth of the aspheric surface (the point on the aspheric surface that is Y from the optical axis I, It is tangent to the plane tangent to the vertex on the aspherical optical axis I, and the vertical distance between the two); K: conic coefficient (conic constant); a 2i : 2ith-order aspherical coefficient.

第一透鏡1的放大側表面S1到第二透鏡2的縮小側表面S4在公式(1)中的錐面係數以及各項非球面係數如表1中所示。其 中，表1中欄位編號S1表示其為第一透鏡1的放大側表面S1的錐面係數以及非球面係數，其它欄位依此類推。在各實施例中，第一透鏡1的放大側表面S1到第二透鏡2的縮小側表面S4在公式(1)中的第2階非球面係數(a2)皆為0。 The cone coefficients and various aspheric coefficients in formula (1) from the magnification side surface S1 of the first lens 1 to the reduction side surface S4 of the second lens 2 are as shown in Table 1. Among them, the column number S1 in Table 1 indicates that it is the cone coefficient and aspherical coefficient of the magnification side surface S1 of the first lens 1, and the other columns can be deduced in the same way. In each embodiment, the second-order aspherical coefficient (a 2 ) in formula (1) from the magnification side surface S1 of the first lens 1 to the reduction side surface S4 of the second lens 2 is all 0.

定焦投影鏡頭PL還包括光闌0。定焦投影鏡頭PL的鏡筒內徑最小位置設置於第二透鏡組Grp2自放大側A1數來的最後一片至第三透鏡組Grp3自放大側A1數來的最後一片透鏡之間。在本實施例中，定焦投影鏡頭PL之鏡筒內徑最小位置S12(即光闌0)設置於第六透鏡6及第七透鏡7之間。 The fixed focus projection lens PL also includes a diaphragm 0. The minimum inner diameter position of the lens barrel of the fixed-focus projection lens PL is disposed between the last lens of the second lens group Grp2 counted from the magnification side A1 to the last lens of the third lens group Grp3 counted from the magnification side A1. In this embodiment, the minimum inner diameter position S12 of the lens barrel of the fixed-focus projection lens PL (ie, the aperture 0 ) is disposed between the sixth lens 6 and the seventh lens 7 .

在本實施例中，定焦投影鏡頭PL的縮小側A2設置有第一平板C1、第二平板C2、第三平板C3和光閥E。定焦投影鏡頭PL與第一平板C1、第二平板C2、第三C3和光閥E構成一投影裝置。光閥E例如是數位微鏡元件(digital micro-mirror device，DMD)、矽基液晶面板(liquid-crystal-on-silicon panel，LCOS panel)、穿透式液晶面板或其它適當形式的光閥或光閥模組，本發明不對此加以限制。光閥E的出光面S30朝向定焦投影鏡頭PL，使得定焦投影鏡頭PL可將光閥E所投射出的影像光束投影至螢幕、牆面、地面或任何適當的處所。 In this embodiment, the reduction side A2 of the fixed-focus projection lens PL is provided with a first flat plate C1, a second flat plate C2, a third flat plate C3 and a light valve E. The fixed-focus projection lens PL, the first flat plate C1, the second flat plate C2, the third C3 and the light valve E form a projection device. The light valve E is, for example, a digital micro-mirror device (DMD), a liquid-crystal-on-silicon panel (LCOS panel), a transmissive liquid crystal panel or other appropriate forms of light valves or Light valve module, the present invention is not limited to this. The light exit surface S30 of the light valve E faces the fixed-focus projection lens PL, so that the fixed-focus projection lens PL can project the image beam projected by the light valve E onto a screen, wall, floor or any appropriate place.

第一平板C1、第二平板C2、第三平板C3可以為任何適合的透光材質的平板。第一平板C1、第二平板C2、第三平板C3分別具有朝向放大側A1且使影像光束通過的放大側表面S24、S26、S28及朝向縮小側A2且使影像光束通過的縮小側表面S25、 S27、S29。來自光閥E的出光面S30的影像光束，可依序穿過第三平板C3、第二平板C2、第一平板C1而投射至定焦投影鏡頭PL。在一些實例中，第一平板C1、第二平板C2、第三平板C3可調整投影裝置的長度，也可對光閥E提供保護作用。 The first flat plate C1, the second flat plate C2, and the third flat plate C3 can be made of any suitable light-transmitting material. The first flat plate C1, the second flat plate C2, and the third flat plate C3 respectively have magnification side surfaces S24, S26, S28 facing the magnification side A1 and passing the image beam, and reduction side surfaces S25 and S25 facing the reduction side A2 and passing the image beam, respectively. S27, S29. The image beam from the light exit surface S30 of the light valve E can pass through the third flat plate C3, the second flat plate C2, and the first flat plate C1 in sequence and be projected to the fixed-focus projection lens PL. In some examples, the first flat plate C1, the second flat plate C2, and the third flat plate C3 can adjust the length of the projection device and can also provide protection for the light valve E.

定焦投影鏡頭PL包含11至15片具有屈光度的透鏡。在第一實施例中，定焦投影鏡頭PL包含13片具有屈光度的透鏡。定焦投影鏡頭PL系統總長(TTL)小於130毫米。在第一實施例中，系統總長(TTL)為118.900毫米，光圈值(F-number，FNO)為1.800，有效焦距(Effective Focal Length，EFL)為5.220毫米，半視場角(half field of view，HFOV)為57.700。其中，系統總長(TTL)為自第一透鏡1的放大側表面S1計算至光閥E的出光面S30在光軸上的總長度。 A fixed focus projection lens PL contains 11 to 15 lenses with diopter. In the first embodiment, the fixed focus projection lens PL includes 13 lenses with diopter. The total length (TTL) of the fixed focus projection lens PL system is less than 130 mm. In the first embodiment, the total system length (TTL) is 118.900 mm, the aperture value (F-number, FNO) is 1.800, the effective focal length (Effective Focal Length, EFL) is 5.220 mm, and the half field of view (half field of view) , HFOV) is 57.700. The total system length (TTL) is the total length on the optical axis calculated from the magnification side surface S1 of the first lens 1 to the light exit surface S30 of the light valve E.

定焦投影鏡頭PL至少包括兩個非球面透鏡表面。在本實施例中，定焦投影鏡頭PL包括第一透鏡1和第二透鏡2兩片非球面塑膠鏡片，其餘第三透鏡3至第十三透鏡13為玻璃鏡片，也就是說，定焦投影鏡頭PL為玻塑混合鏡頭。定焦投影鏡頭PL自放大側A1數來的第一片透鏡為非球面透鏡。在本實施例中，第一透鏡1為非球面透鏡。定焦投影鏡頭PL自放大側A1數來的第一片透鏡為負屈光度透鏡。在本實施例中，第一透鏡1為負屈光度透鏡。 The fixed focus projection lens PL includes at least two aspherical lens surfaces. In this embodiment, the fixed-focus projection lens PL includes two aspherical plastic lenses, the first lens 1 and the second lens 2, and the remaining third to thirteenth lenses 3 to 13 are glass lenses. That is to say, the fixed-focus projection lens PL Lens PL is a glass-plastic hybrid lens. The first lens from the magnification side A1 of the fixed-focus projection lens PL is an aspherical lens. In this embodiment, the first lens 1 is an aspherical lens. The first lens from the magnification side A1 of the fixed-focus projection lens PL is a negative diopter lens. In this embodiment, the first lens 1 is a negative refractive power lens.

本實施例的定焦投影鏡頭PL包括一雙膠合透鏡和一三膠合透鏡，其中雙膠合透鏡中的正屈光度透鏡的阿貝數大於70， 且三膠合透鏡中的負屈光度透鏡的阿貝數小於40且折射率大於或等於1.8。在本實施例中，定焦投影鏡頭PL包括第八透鏡8、第九透鏡9和第十透鏡10接合的三膠合透鏡、第十一透鏡11和第十二透鏡12接合的雙膠合透鏡，其中，具有正屈光度的第九透鏡9與第十一透鏡11的阿貝數為81.6。在本實施例中，定焦投影鏡頭PL包括第八透鏡8、第九透鏡9和第十透鏡10接合的三膠合透鏡，其中，具有正屈光度的第九透鏡的阿貝數為81.6，且具有負屈光度的第八透鏡8的阿貝數為37.9且折射率為1.885、具有負屈光度的第十透鏡10的阿貝數為35.9且折射率為1.887。 The fixed-focus projection lens PL of this embodiment includes a pair of cemented lenses and a triplet lens, wherein the positive refractive power lens in the double cemented lenses has an Abbe number greater than 70. And the Abbe number of the negative diopter lens in the triplet lens is less than 40 and the refractive index is greater than or equal to 1.8. In this embodiment, the fixed-focus projection lens PL includes a triplet lens in which the eighth lens 8 , the ninth lens 9 and the tenth lens 10 are joined, and a doublet lens in which the eleventh lens 11 and the twelfth lens 12 are joined, wherein , the Abbe number of the ninth lens 9 and the eleventh lens 11 with positive refractive power is 81.6. In this embodiment, the fixed-focus projection lens PL includes a triple cemented lens in which the eighth lens 8 , the ninth lens 9 and the tenth lens 10 are joined, wherein the ninth lens with positive refractive power has an Abbe number of 81.6 and has The eighth lens 8 with negative refractive power has an Abbe number of 37.9 and a refractive index of 1.885, and the tenth lens 10 with negative refractive power has an Abbe number of 35.9 and a refractive index of 1.887.

第一實施例的定焦投影鏡頭PL的其他詳細光學數據如下表1所示。其中，「間距/厚度」欄列出各表面之間的距離，該距離表示各透鏡或平板在光軸I上的厚度，或是各透鏡或平板與下一光學元件的表面之間在光軸I上的距離。舉例來說，在列「S1」中，「間距/厚度」表示第一透鏡1在光軸I上的厚度，而在列「S2」中，「間距/厚度」表示第一透鏡1與第二透鏡2之間在光軸I上的距離，以此類推。此外，在「備註」欄中，除註記對應的光學元件之外，也標記了對應的透鏡的材質以及其他特徵。其中，標記「非球面」的透鏡為非球面透鏡，未標記「非球面」的透鏡為球面透鏡。 Other detailed optical data of the fixed-focus projection lens PL of the first embodiment are shown in Table 1 below. Among them, the "Spacing/Thickness" column lists the distance between the surfaces. This distance represents the thickness of each lens or plate on the optical axis I, or the distance between each lens or plate and the surface of the next optical element on the optical axis. distance on I. For example, in column "S1", "pitch/thickness" represents the thickness of the first lens 1 on the optical axis I, and in column "S2", "pitch/thickness" represents the thickness of the first lens 1 and the second lens 1. The distance between lenses 2 on the optical axis I, and so on. In addition, in the "Remarks" column, in addition to the corresponding optical components, the material of the corresponding lens and other characteristics are also marked. Among them, lenses marked "aspheric" are aspheric lenses, and lenses not marked "aspheric" are spherical lenses.

Figure 110122472-A0305-02-0013-2
Figure 110122472-A0305-02-0013-2
Figure 110122472-A0305-02-0014-3
Figure 110122472-A0305-02-0014-3

在另一觀點中，請再參照圖1，定焦投影鏡頭PL包括第一透鏡組Grp1、第二透鏡組Grp2和第三透鏡組Grp3。其中， 第一透鏡組Grp1、第二透鏡組Grp2和第三透鏡組Grp3自放大側A1到縮小側A2在光軸I上依序排列。第一透鏡組Grp1和第三透鏡組Grp3為固定透鏡組，第二透鏡組Grp2為可動透鏡組。 In another perspective, please refer to FIG. 1 again. The fixed-focus projection lens PL includes a first lens group Grp1, a second lens group Grp2 and a third lens group Grp3. in, The first lens group Grp1, the second lens group Grp2 and the third lens group Grp3 are sequentially arranged on the optical axis I from the magnification side A1 to the reduction side A2. The first lens group Grp1 and the third lens group Grp3 are fixed lens groups, and the second lens group Grp2 is a movable lens group.

詳細來說，第一透鏡組Grp1包括上述的第一透鏡1、第二透鏡2、第三透鏡3和第四透鏡4。第一透鏡組Grp1包括四個非球面透鏡表面S1、S2、S3、S4。第一透鏡組Grp1不包括膠合透鏡。第一透鏡組Grp1中包含至少二個負屈光度透鏡。在本實施例中，第一透鏡組Grp1中包含三個負屈光度透鏡。 In detail, the first lens group Grp1 includes the above-mentioned first lens 1, second lens 2, third lens 3 and fourth lens 4. The first lens group Grp1 includes four aspherical lens surfaces S1, S2, S3, S4. The first lens group Grp1 does not include a cemented lens. The first lens group Grp1 includes at least two negative diopter lenses. In this embodiment, the first lens group Grp1 includes three negative refractive power lenses.

第二透鏡組Grp2包括上述的第五透鏡5和第六透鏡6。在本實施例中，在第二透鏡組Grp2中最靠近縮小側A2的表面S11為凸面，且其表面屈光度(surface power)為正。 The second lens group Grp2 includes the fifth lens 5 and the sixth lens 6 described above. In this embodiment, the surface S11 closest to the reduction side A2 in the second lens group Grp2 is a convex surface, and its surface power is positive.

第三透鏡組Grp3包含6至9片具有屈光度的透鏡。在本實施例中，第三透鏡組Grp3包括上述的第七透鏡7、第八透鏡8、第九透鏡9、第十透鏡10、第十一透鏡11、第十二透鏡12和第十三透鏡13，包含7片具有屈光度的透鏡，且該些透鏡皆為球面鏡片。在本實施例中，第三透鏡組Grp3包括至少兩對相鄰透鏡表面，其中第八透鏡8的縮小側表面S16和第九透鏡9的放大側表面S16為一對相鄰透鏡表面，第九透鏡9的縮小側表面S17和第十透鏡10的放大側表面S17為一對相鄰透鏡表面、第十一透鏡11的縮小側表面S20和第十二透鏡12的放大側表面S20為一對相鄰透鏡表面，上述的各對相鄰透鏡表面各自符合以下條件：一對相鄰透鏡表面之間的曲率半徑差與該相鄰透鏡表面中較 大曲率半徑的比值<0.01。 The third lens group Grp3 includes 6 to 9 lenses with diopter. In this embodiment, the third lens group Grp3 includes the above-mentioned seventh lens 7, eighth lens 8, ninth lens 9, tenth lens 10, eleventh lens 11, twelfth lens 12 and thirteenth lens 13. Contains 7 lenses with diopter, and these lenses are all spherical lenses. In this embodiment, the third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the reduction side surface S16 of the eighth lens 8 and the magnification side surface S16 of the ninth lens 9 are a pair of adjacent lens surfaces. The reduction side surface S17 of the lens 9 and the magnification side surface S17 of the tenth lens 10 are a pair of adjacent lens surfaces, and the reduction side surface S20 of the eleventh lens 11 and the magnification side surface S20 of the twelfth lens 12 are a pair of adjacent lens surfaces. adjacent lens surfaces, each of the above-mentioned pairs of adjacent lens surfaces meets the following conditions: the difference in curvature radius between a pair of adjacent lens surfaces is equal to the greater of the adjacent lens surfaces. The ratio of large curvature radii is <0.01.

在本實施例中，定焦投影鏡頭PL可透過下述方式達成調焦：第一透鏡組Grp1相對於光閥E在光軸I上移動，第二透鏡組Grp2與第三透鏡組Grp3相對於光閥E固定；第二透鏡組Grp2相對於光閥E在光軸I上移動，第一透鏡組Grp1與第三透鏡組Grp3相對於光閥E固定；或第一透鏡組Grp1與第二透鏡組Grp2同時分別相對於光閥E在光軸I上移動，第三透鏡組Grp3相對於光閥E固定。也就是說，在本實施例中，可以透過單獨調整第一透鏡組Grp1或第二透鏡組Grp2來達成調焦，或是透過同時調整第一透鏡組Grp1及第二透鏡組Grp2來達成調焦。 In this embodiment, the fixed-focus projection lens PL can achieve focus adjustment in the following manner: the first lens group Grp1 moves on the optical axis I relative to the light valve E, and the second lens group Grp2 and the third lens group Grp3 move relative to the light valve E. The light valve E is fixed; the second lens group Grp2 moves on the optical axis I relative to the light valve E, and the first lens group Grp1 and the third lens group Grp3 are fixed relative to the light valve E; or the first lens group Grp1 and the second lens The group Grp2 simultaneously moves on the optical axis I relative to the light valve E, and the third lens group Grp3 is fixed relative to the light valve E. That is to say, in this embodiment, focusing can be achieved by individually adjusting the first lens group Grp1 or the second lens group Grp2, or by simultaneously adjusting the first lens group Grp1 and the second lens group Grp2. .

在本實施例中，定焦投影鏡頭PL滿足下列條件：0.6<D1/OAL1<0.8；2<D1/DL<4；0.06<TH23/OAL2<0.32；9≦HFOV/EFL≦11.5；及19≦TTL/EFL≦25。 In this embodiment, the fixed-focus projection lens PL satisfies the following conditions: 0.6<D1/OAL1<0.8; 2<D1/DL<4; 0.06<TH23/OAL2<0.32; 9≦HFOV/EFL≦11.5; and 19≦ TTL/EFL≦25.

在上述的條件式中：TTL為定焦投影鏡頭PL的系統總長；EFL為定焦投影鏡頭PL的有效焦距；HFOV為定焦投影鏡頭PL的半視場角；OAL1為定焦投影鏡頭PL兩端的最外側透鏡表面之間的最短距離； OAL2為定焦投影鏡頭PL兩端的最外側透鏡表面之間在光軸上的距離；TH23為第二透鏡組Grp2到第三透鏡組Grp3之間在光軸上的距離；D1為定焦投影鏡頭PL自放大側A1數來的第一片透鏡的直徑；DL為定焦投影鏡頭PL自放大側A1數來的最後一片透鏡的直徑。 In the above conditional expression: TTL is the total system length of the fixed-focus projection lens PL; EFL is the effective focal length of the fixed-focus projection lens PL; HFOV is the half field of view angle of the fixed-focus projection lens PL; OAL1 is the two fixed-focus projection lenses PL. The shortest distance between the outermost lens surfaces of the ends; OAL2 is the distance on the optical axis between the outermost lens surfaces at both ends of the fixed-focus projection lens PL; TH23 is the distance on the optical axis between the second lens group Grp2 and the third lens group Grp3; D1 is the fixed-focus projection lens PL is the diameter of the first lens counted from the magnification side A1; DL is the diameter of the last lens of the fixed-focus projection lens PL counted from the magnification side A1.

需特別說明的是，本文中所述的「D1」為定焦投影鏡頭PL自放大側A1數來的第一片透鏡的直徑。其中，直徑指光學中心兩側的轉折點之間的距離。在本實施例中，第一透鏡1的放大側表面S1的直徑，即為為放大側表面S1的曲面從光學中心往兩側透鏡邊緣延伸而發生轉折的兩處之間的距離(圖1中的P1點及Q1點之間的距離)。當第一透鏡1的放大側表面S1的直徑與第一透鏡1的縮小側表面S2的直徑不同時，以其中較大者為第一透鏡1的直徑。本文中所述的「DL」為定焦投影鏡頭PL自放大側A1數來的最後一片透鏡的直徑。其中，直徑指光學中心兩側的轉折點之間的距離。在本實施例中，第十三透鏡13的縮小側表面S23的直徑，即為縮小側表面S23的曲面從光學中心往兩側透鏡邊緣延伸而發生轉折的兩處之間的距離(為圖1中的P2點及Q2點之間的距離)。當第十三透鏡13的放大側表面S22的直徑與第十三透鏡13的縮小側表面S23的直徑不同時，以其中 較大者為第十三透鏡13的直徑。因此，該等直徑與一般光學模擬軟體所輸出的光學有效徑並不相同。 It should be noted that "D1" mentioned in this article is the diameter of the first lens of the fixed-focus projection lens PL counted from the magnification side A1. Where, diameter refers to the distance between the turning points on both sides of the optical center. In this embodiment, the diameter of the magnification side surface S1 of the first lens 1 is the distance between two places where the curved surface of the magnification side surface S1 extends from the optical center to the lens edges on both sides and turns (in Figure 1 the distance between P1 point and Q1 point). When the diameter of the magnification side surface S1 of the first lens 1 is different from the diameter of the reduction side surface S2 of the first lens 1 , the larger one is the diameter of the first lens 1 . The "DL" mentioned in this article is the diameter of the last lens of the fixed-focus projection lens PL counted from the magnification side A1. Where, diameter refers to the distance between the turning points on both sides of the optical center. In this embodiment, the diameter of the reducing side surface S23 of the thirteenth lens 13 is the distance between two places where the curved surface of the reducing side surface S23 extends from the optical center to the lens edges on both sides and turns (see Figure 1 the distance between P2 point and Q2 point in ). When the diameter of the magnification side surface S22 of the thirteenth lens 13 is different from the diameter of the reduction side surface S23 of the thirteenth lens 13, where The larger one is the diameter of the thirteenth lens 13 . Therefore, these diameters are not the same as the optical effective diameter output by general optical simulation software.

本實施例的定焦投影鏡頭PL的相關光學數值詳列於後附的表6及表7中。其中，表6的「G2-EFL」欄位列出各實施例的第二透鏡組G2的有效焦距。 The relevant optical values of the fixed-focus projection lens PL of this embodiment are detailed in the attached Tables 6 and 7. Among them, the "G2-EFL" column of Table 6 lists the effective focal length of the second lens group G2 of each embodiment.

圖2為本發明的第二實施例的定焦投影鏡頭PL的示意圖。請參照圖2。本發明的第二實施例的定焦投影鏡頭PL與第一實施例的定焦投影鏡頭PL大致相似，兩者的差異在於：第一透鏡組G1及第二透鏡組G2的組成、各元件的光學數據以及各元件之間的間距等參數不完全相同。以下僅就兩者不同之處為簡要說明。 FIG. 2 is a schematic diagram of a fixed-focus projection lens PL according to the second embodiment of the present invention. Please refer to Figure 2. The fixed-focus projection lens PL of the second embodiment of the present invention is roughly similar to the fixed-focus projection lens PL of the first embodiment. The difference between the two lies in: the composition of the first lens group G1 and the second lens group G2, and the composition of each element. Parameters such as optical data and spacing between components are not exactly the same. The following is only a brief explanation of the differences between the two.

在本實施例中，第二透鏡組G2包含8片具有屈光度的透鏡，自放大側A1到縮小側A2依序包括第七透鏡7、第八透鏡8、第九透鏡9、第十透鏡10、第十一透鏡11、第十二透鏡12、第十三透鏡13和第十四透鏡14，其中包括第八透鏡8、第九透鏡9和第十透鏡10接合的三膠合透鏡、第十二透鏡12和第十三透鏡13接合的雙膠合透鏡，第七透鏡7、第十一透鏡11和第十四透鏡14則為單片透鏡。 In this embodiment, the second lens group G2 includes 8 lenses with refractive power, including a seventh lens 7 , an eighth lens 8 , a ninth lens 9 , a tenth lens 10 , and the like in order from the magnification side A1 to the reduction side A2 . The eleventh lens 11, the twelfth lens 12, the thirteenth lens 13 and the fourteenth lens 14, including the triple cemented lens and the twelfth lens in which the eighth lens 8, the ninth lens 9 and the tenth lens 10 are joined together The seventh lens 7 , the eleventh lens 11 and the fourteenth lens 14 are single lenses.

第二實施例的定焦投影鏡頭PL包含14片具有屈光度的透鏡，自放大側A1到縮小側A2依序為第一透鏡1至第十四透鏡14，其中第一透鏡1至第十四透鏡14的屈光率依序為：負、正、負、負、負、正、正、負、正、負、正、正、負、正。在本實施例 中，系統總長(TTL)為126.000毫米，光圈值(F-number，FNO)為1.800，有效焦距(Effective Focal Length，EFL)為5.210毫米，半視場角(half field of view，HFOV)為57.710。第一透鏡1至第十四透鏡14的各透鏡表面的面型特徵如下表2以及圖2中所示。 The fixed-focus projection lens PL of the second embodiment includes 14 lenses with diopter, which are the first lens 1 to the fourteenth lens 14 in order from the magnification side A1 to the reduction side A2, among which the first lens 1 to the fourteenth lens The refractive power of 14 is, in order: negative, positive, negative, negative, negative, positive, positive, negative, positive, negative, positive, positive, negative, positive. In this embodiment , the total system length (TTL) is 126.000 mm, the aperture value (F-number, FNO) is 1.800, the effective focal length (Effective Focal Length, EFL) is 5.210 mm, and the half field of view (half field of view, HFOV) is 57.710 . The surface characteristics of each lens surface of the first lens 1 to the fourteenth lens 14 are shown in Table 2 below and Figure 2 .

第二實施例的定焦投影鏡頭PL的其他詳細光學數據如下表2所示。 Other detailed optical data of the fixed-focus projection lens PL of the second embodiment are shown in Table 2 below.

Figure 110122472-A0305-02-0019-4
Figure 110122472-A0305-02-0019-4
Figure 110122472-A0305-02-0020-6
Figure 110122472-A0305-02-0020-6

在本實施例中，第一透鏡組Grp1包括第一透鏡1、第二透鏡2和第三透鏡3。第二透鏡組Grp2包括第四透鏡4、第五透鏡5和第六透鏡6。而第三透鏡組Grp3包括第七透鏡7、第八透鏡8、第九透鏡9、第十透鏡10、第十一透鏡11、第十二透鏡12、第十三透鏡13和第十四透鏡14。第三透鏡組Grp3包括至少兩對相鄰透鏡表面，其中第八透鏡8的縮小側表面S16和第九透鏡9的放大側表面S16為一對相鄰透鏡表面，第九透鏡9的縮小側表面S17和第十透鏡10的放大側表面S17為一對相鄰透鏡表面、第十二透鏡12的縮小側表面S22和第十三透鏡13的放大側表面S22為一對相鄰透鏡表面，上述的各對相鄰透鏡表面各自符合以下條件：一對相鄰透鏡表面之間的曲率半徑差與該相鄰透鏡表面中較大曲率半徑的比值<0.01。 In this embodiment, the first lens group Grp1 includes a first lens 1 , a second lens 2 and a third lens 3 . The second lens group Grp2 includes a fourth lens 4 , a fifth lens 5 and a sixth lens 6 . The third lens group Grp3 includes a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, a twelfth lens 12, a thirteenth lens 13 and a fourteenth lens 14 . The third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the reduction side surface S16 of the eighth lens 8 and the magnification side surface S16 of the ninth lens 9 are a pair of adjacent lens surfaces, and the reduction side surface of the ninth lens 9 S17 and the magnification side surface S17 of the tenth lens 10 are a pair of adjacent lens surfaces. The reduction side surface S22 of the twelfth lens 12 and the magnification side surface S22 of the thirteenth lens 13 are a pair of adjacent lens surfaces. The above-mentioned Each pair of adjacent lens surfaces each meets the following conditions: the ratio of the difference in radius of curvature between a pair of adjacent lens surfaces to the larger radius of curvature of the adjacent lens surface is <0.01.

本實施例的定焦投影鏡頭PL的相關光學數值詳列於後 附的表6及表7中。 The relevant optical values of the fixed-focus projection lens PL of this embodiment are detailed below. In the attached Table 6 and Table 7.

圖3為本發明的第三實施例的定焦投影鏡頭的示意圖。請參照圖3。本發明的第三實施例的定焦投影鏡頭PL與第一實施例的定焦投影鏡頭PL大致相似，兩者的差異在於：第一透鏡組G1及第二透鏡組G2的組成、各元件的光學數據以及各元件之間的間距等參數不完全相同。以下僅就兩者不同之處為簡要說明。 FIG. 3 is a schematic diagram of a fixed-focus projection lens according to a third embodiment of the present invention. Please refer to Figure 3. The fixed-focus projection lens PL of the third embodiment of the present invention is roughly similar to the fixed-focus projection lens PL of the first embodiment. The difference between the two lies in: the composition of the first lens group G1 and the second lens group G2, and the composition of each element. Parameters such as optical data and spacing between components are not exactly the same. The following is only a brief explanation of the differences between the two.

在本實施例中，第二透鏡組G2中，第十一透鏡11、第十二透鏡12和第十三透鏡13為單片透鏡。 In this embodiment, in the second lens group G2, the eleventh lens 11, the twelfth lens 12 and the thirteenth lens 13 are single lenses.

第三實施例的定焦投影鏡頭PL包含13片具有屈光度的透鏡，自放大側A1到縮小側A2依序為第一透鏡1至第十三透鏡13，其中第一透鏡1至第十三透鏡13的屈光率依序為：負、負、負、正、負、正、正、負、正、負、正、正、正。在本實施例中，系統總長(TTL)為120.000毫米，光圈值(F-number，FNO)為1.800，有效焦距(Effective Focal Length，EFL)為5.269毫米，半視場角(half field of view，HFOV)為57.520。第一透鏡1至第十三透鏡13的各透鏡表面的面型特徵如下表3以及圖3中所示。 The fixed-focus projection lens PL of the third embodiment includes 13 lenses with diopter, which are the first lens 1 to the thirteenth lens 13 in order from the magnification side A1 to the reduction side A2, among which the first lens 1 to the thirteenth lens The refractive power of 13 is, in order: negative, negative, negative, positive, negative, positive, positive, negative, positive, negative, positive, positive, positive. In this embodiment, the total system length (TTL) is 120.000 mm, the aperture value (F-number, FNO) is 1.800, the effective focal length (Effective Focal Length, EFL) is 5.269 mm, and the half field of view (half field of view) is 1.800. HFOV) is 57.520. The surface characteristics of each lens surface of the first lens 1 to the thirteenth lens 13 are as shown in Table 3 below and Figure 3 .

第三實施例的定焦投影鏡頭PL的其他詳細光學數據如下表3所示。 Other detailed optical data of the fixed-focus projection lens PL of the third embodiment are shown in Table 3 below.

Figure 110122472-A0305-02-0021-7
Figure 110122472-A0305-02-0021-7
Figure 110122472-A0305-02-0022-9
Figure 110122472-A0305-02-0022-9

在本實施例中，第一透鏡組Grp1包括第一透鏡1、第二 透鏡2和第三透鏡3。第二透鏡組Grp2包括第四透鏡4、第五透鏡5和第六透鏡6。第三透鏡組Grp3包括第七透鏡7、第八透鏡8、第九透鏡9、第十透鏡10、第十一透鏡11、第十二透鏡12和第十三透鏡13。第三透鏡組Grp3包括至少兩對相鄰透鏡表面，其中第八透鏡8的縮小側表面S15和第九透鏡9的放大側表面S15為一對相鄰透鏡表面，第九透鏡9的縮小側表面S16和第十透鏡10的放大側表面S16為一對相鄰透鏡表面，上述的各對相鄰透鏡表面各自符合以下條件：一對相鄰透鏡表面之間的曲率半徑差與該相鄰透鏡表面中較大曲率半徑的比值<0.01。 In this embodiment, the first lens group Grp1 includes a first lens 1, a second Lens 2 and third lens 3. The second lens group Grp2 includes a fourth lens 4 , a fifth lens 5 and a sixth lens 6 . The third lens group Grp3 includes a seventh lens 7 , an eighth lens 8 , a ninth lens 9 , a tenth lens 10 , an eleventh lens 11 , a twelfth lens 12 and a thirteenth lens 13 . The third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the reduction side surface S15 of the eighth lens 8 and the magnification side surface S15 of the ninth lens 9 are a pair of adjacent lens surfaces, and the reduction side surface of the ninth lens 9 S16 and the magnification side surface S16 of the tenth lens 10 are a pair of adjacent lens surfaces. Each pair of adjacent lens surfaces above meets the following conditions: the difference in curvature radius between a pair of adjacent lens surfaces and the adjacent lens surface The ratio of the medium to the largest radius of curvature is <0.01.

本實施例的定焦投影鏡頭PL的相關光學數值詳列於後附的表6及表7中。 The relevant optical values of the fixed-focus projection lens PL of this embodiment are detailed in the attached Tables 6 and 7.

圖4為本發明的第四實施例的定焦投影鏡頭的示意圖。請參照圖4。本發明的第四實施例的定焦投影鏡頭PL與第一實施例的定焦投影鏡頭PL大致相似，兩者的差異在於：第一透鏡組G1及第二透鏡組G2的組成、各元件的光學數據以及各元件之間的間距等參數不完全相同。以下僅就兩者不同之處為簡要說明。 FIG. 4 is a schematic diagram of a fixed-focus projection lens according to a fourth embodiment of the present invention. Please refer to Figure 4. The fixed-focus projection lens PL of the fourth embodiment of the present invention is roughly similar to the fixed-focus projection lens PL of the first embodiment. The difference between the two lies in: the composition of the first lens group G1 and the second lens group G2, and the composition of each element. Parameters such as optical data and spacing between components are not exactly the same. The following is only a brief explanation of the differences between the two.

在本實施例中，第一透鏡組G1包含7片具有屈光度的透鏡，自放大側A1到縮小側A2依序包括第一透鏡1、第二透鏡2、第三透鏡3、第四透鏡4、第五透鏡5、第六透鏡6和第七透鏡7。在另一實施例中，也可以將非球面透鏡的第一透鏡1改以1片非球面透鏡和1片球面透鏡取代，此時，第一透鏡組G1包 含8片具有屈光度的透鏡。在另一實施例中，也可以將兩片相鄰的球面透鏡改以1片非球面透鏡取代，此時，第一透鏡組G1包含6片具有屈光度的透鏡。第二透鏡組G2包含5片具有屈光度的透鏡，自放大側A1到縮小側A2依序包括第八透鏡8、第九透鏡9、第十透鏡10、第十一透鏡11和第十二透鏡12，其中第八透鏡8、第九透鏡9和第十透鏡10接合形成三膠合透鏡，第十一透鏡11和第十二透鏡12則為單片透鏡。其中，定焦投影鏡頭PL之鏡筒內徑最小位置S12(即光闌0)設置於第七透鏡7及第八透鏡8之間。在另一實施例中，也可以將球面透鏡的第十二透鏡12改以2片球面透鏡取代，此時，第二透鏡組G2包含6片具有屈光度的透鏡。在另一實施例中，也可以將球面透鏡的第十二透鏡12改以3片球面透鏡取代，此時，第二透鏡組G2包含7片具有屈光度的透鏡。在另一實施例中，也可以將球面透鏡的第十一透鏡11改以2片球面透鏡取代，並將球面透鏡的第十二透鏡12改以3片球面透鏡取代，此時，第二透鏡組G2包含8片具有屈光度的透鏡。 In this embodiment, the first lens group G1 includes 7 lenses with diopter, including the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, in order from the magnification side A1 to the reduction side A2. The fifth lens 5, the sixth lens 6 and the seventh lens 7. In another embodiment, the first lens 1 of the aspherical lens can also be replaced by an aspherical lens and a spherical lens. In this case, the first lens group G1 includes Contains 8 lenses with diopter. In another embodiment, two adjacent spherical lenses can also be replaced by one aspherical lens. In this case, the first lens group G1 includes 6 lenses with diopter. The second lens group G2 includes five lenses with diopter, including an eighth lens 8 , a ninth lens 9 , a tenth lens 10 , an eleventh lens 11 and a twelfth lens 12 in order from the magnification side A1 to the reduction side A2 , in which the eighth lens 8, the ninth lens 9 and the tenth lens 10 are joined to form a three-cemented lens, and the eleventh lens 11 and the twelfth lens 12 are single lenses. Among them, the minimum inner diameter position S12 of the lens barrel of the fixed-focus projection lens PL (ie, the aperture 0 ) is disposed between the seventh lens 7 and the eighth lens 8 . In another embodiment, the twelfth lens 12 of the spherical lens can also be replaced by two spherical lenses. In this case, the second lens group G2 includes six lenses with diopter. In another embodiment, the twelfth lens 12 of the spherical lens can also be replaced by three spherical lenses. In this case, the second lens group G2 includes seven lenses with diopter. In another embodiment, the eleventh lens 11 of the spherical lens can also be replaced by two spherical lenses, and the twelfth lens 12 of the spherical lens can be replaced by three spherical lenses. In this case, the second lens Group G2 contains 8 lenses with diopters.

第四實施例的定焦投影鏡頭PL包含12片具有屈光度的透鏡，自放大側A1到縮小側A2依序為第一透鏡1至第十二透鏡12，其中第一透鏡1至第十二透鏡12的屈光率依序為：負、正、負、負、正、正、正、負、正、負、正、正。在本實施例中，系統總長(TTL)為124.500毫米，光圈值(F-number，FNO)為1.800，有效焦距(Effective Focal Length，EFL)為5.230毫米，半視場角 (half field of view，HFOV)為57.660。第一透鏡1至第十二透鏡12的各透鏡表面的面型特徵如下表4以及圖4中所示。 The fixed-focus projection lens PL of the fourth embodiment includes 12 lenses with diopter, which are the first lens 1 to the twelfth lens 12 in order from the magnification side A1 to the reduction side A2, among which the first lens 1 to the twelfth lens The refractive power of 12 is, in order: negative, positive, negative, negative, positive, positive, positive, negative, positive, negative, positive, positive. In this embodiment, the total system length (TTL) is 124.500 mm, the aperture value (F-number, FNO) is 1.800, the effective focal length (Effective Focal Length, EFL) is 5.230 mm, and the half field of view (half field of view, HFOV) is 57.660. The surface characteristics of each lens surface of the first lens 1 to the twelfth lens 12 are as shown in Table 4 below and Figure 4 .

第四實施例的定焦投影鏡頭PL的其他詳細光學數據如下表4所示。 Other detailed optical data of the fixed-focus projection lens PL of the fourth embodiment are shown in Table 4 below.

Figure 110122472-A0305-02-0025-10
Figure 110122472-A0305-02-0025-10
Figure 110122472-A0305-02-0026-11
Figure 110122472-A0305-02-0026-11

在本實施例中，第一透鏡組Grp1包括第一透鏡1、第二透鏡2和第三透鏡3。第二透鏡組Grp2包括第四透鏡4、第五透鏡5和第六透鏡6。第三透鏡組Grp3包括第七透鏡7、第八透鏡8、第九透鏡9、第十透鏡10、第十一透鏡11和第十二透鏡12。第三透鏡組Grp3包括至少兩對相鄰透鏡表面，其中第八透鏡8的縮小側表面S16和第九透鏡9的放大側表面S16為一對相鄰透鏡表面，第九透鏡9的縮小側表面S17和第十透鏡10的放大側表面S17為一對相鄰透鏡表面，上述的各對相鄰透鏡表面各自符合以下條件：一對相鄰透鏡表面之間的曲率半徑差與該相鄰透鏡表面中較大曲率半徑的比值<0.01。 In this embodiment, the first lens group Grp1 includes a first lens 1 , a second lens 2 and a third lens 3 . The second lens group Grp2 includes a fourth lens 4 , a fifth lens 5 and a sixth lens 6 . The third lens group Grp3 includes a seventh lens 7 , an eighth lens 8 , a ninth lens 9 , a tenth lens 10 , an eleventh lens 11 and a twelfth lens 12 . The third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the reduction side surface S16 of the eighth lens 8 and the magnification side surface S16 of the ninth lens 9 are a pair of adjacent lens surfaces, and the reduction side surface of the ninth lens 9 S17 and the magnification side surface S17 of the tenth lens 10 are a pair of adjacent lens surfaces. Each pair of adjacent lens surfaces above meets the following conditions: the difference in curvature radius between a pair of adjacent lens surfaces and the adjacent lens surface The ratio of the medium to the largest radius of curvature is <0.01.

本實施例的定焦投影鏡頭PL的相關光學數值詳列於後附的表6及表7中。 The relevant optical values of the fixed-focus projection lens PL of this embodiment are detailed in the attached Tables 6 and 7.

圖5為本發明的第五實施例的定焦投影鏡頭的示意圖。請參照圖5。本發明的第五實施例的定焦投影鏡頭PL與第一實施例的定焦投影鏡頭PL大致相似，兩者的差異在於：第一透鏡組G1及第二透鏡組G2的組成、各元件的光學數據以及各元件之間的間距等參數不完全相同。以下僅就兩者不同之處為簡要說 明。 FIG. 5 is a schematic diagram of a fixed-focus projection lens according to the fifth embodiment of the present invention. Please refer to Figure 5. The fixed-focus projection lens PL of the fifth embodiment of the present invention is roughly similar to the fixed-focus projection lens PL of the first embodiment. The difference between the two lies in: the composition of the first lens group G1 and the second lens group G2, and the composition of each element. Parameters such as optical data and spacing between components are not exactly the same. The following is only a brief introduction to the differences between the two. bright.

在本實施例中，第一透鏡組G1包含7片具有屈光度的透鏡，自放大側A1到縮小側A2依序包括第一透鏡1、第二透鏡2、第三透鏡3、第四透鏡4、第五透鏡5、第六透鏡6和第七透鏡7，其中。第二透鏡組G2包含7片具有屈光度的透鏡，自放大側A1到縮小側A2依序包括第第八透鏡8、第九透鏡9、第十透鏡10、第十一透鏡11、第十二透鏡12、第十三透鏡13和第十四透鏡14，其中第九透鏡9、第十透鏡10和第十一透鏡11接合為三膠合透鏡，第十二透鏡12和第十三透鏡13接合成雙膠合透鏡。第八透鏡8和第十四透鏡14則為單片透鏡。定焦投影鏡頭PL之鏡筒內徑最小位置S12(即光闌0)設置於第七透鏡7及第八透鏡8之間。 In this embodiment, the first lens group G1 includes 7 lenses with diopter, including the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, in order from the magnification side A1 to the reduction side A2. The fifth lens 5, the sixth lens 6 and the seventh lens 7, among which. The second lens group G2 includes 7 lenses with diopter, including the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, and the twelfth lens in order from the magnification side A1 to the reduction side A2. 12. The thirteenth lens 13 and the fourteenth lens 14, of which the ninth lens 9, the tenth lens 10 and the eleventh lens 11 are joined to form a triple cemented lens, and the twelfth lens 12 and the thirteenth lens 13 are joined to form a double lens Glued lenses. The eighth lens 8 and the fourteenth lens 14 are single lenses. The minimum inner diameter position S12 of the lens barrel of the fixed-focus projection lens PL (ie, the aperture 0) is disposed between the seventh lens 7 and the eighth lens 8 .

第五實施例的定焦投影鏡頭PL包含14片具有屈光度的透鏡，自放大側A1到縮小側A2依序為第一透鏡1至第十四透鏡14，其中第一透鏡1至第十四透鏡14的屈光率依序為：負、正、負、負、負、正、正、正、負、正、負、正、負、正。在本實施例中，系統總長(TTL)為124.700毫米，光圈值(F-number，FNO)為1.800，有效焦距(Effective Focal Length，EFL)為5.260毫米，半視場角(half field of view，HFOV)為57.560。第一透鏡1至第十四透鏡14的各透鏡表面的面型特徵如下表5以及圖5中所示。 The fixed-focus projection lens PL of the fifth embodiment includes 14 lenses with diopter, which are the first lens 1 to the fourteenth lens 14 in order from the magnification side A1 to the reduction side A2, among which the first lens 1 to the fourteenth lens The refractive power of 14 is, in order: negative, positive, negative, negative, negative, positive, positive, positive, negative, positive, negative, positive, negative, positive. In this embodiment, the total system length (TTL) is 124.700 mm, the aperture value (F-number, FNO) is 1.800, the effective focal length (Effective Focal Length, EFL) is 5.260 mm, and the half field of view (half field of view) is 1.800. HFOV) is 57.560. The surface characteristics of each lens surface of the first lens 1 to the fourteenth lens 14 are shown in Table 5 below and Figure 5 .

第五實施例的定焦投影鏡頭PL的其他詳細光學數據如下表5所示。 Other detailed optical data of the fixed-focus projection lens PL of the fifth embodiment are shown in Table 5 below.

Figure 110122472-A0305-02-0028-12
Figure 110122472-A0305-02-0028-12
Figure 110122472-A0305-02-0029-13
Figure 110122472-A0305-02-0029-13

在本實施例中，第一透鏡組Grp1包括第一透鏡1、第二透鏡2和第三透鏡3。第二透鏡組Grp2包括第四透鏡4、第五透鏡5、第六透鏡6和第七透鏡7。第二透鏡組Grp3包括第八透鏡8、第九透鏡9、第十透鏡10、第十一透鏡11、第十二透鏡12、第十三透鏡13和第十四透鏡14。第三透鏡組Grp3包括至少兩對相鄰透鏡表面，其中第九透鏡9的縮小側表面S18和第十透鏡10的放大側表面S18為一對相鄰透鏡表面，第十透鏡10的縮小側表面S19和第十一透鏡11的放大側表面S19為一對相鄰透鏡表面、第十二透鏡12的縮小側表面S22和第十三透鏡13的放大側表面S22為一對相鄰透鏡表面，上述的各對相鄰透鏡表面各自符合以下條件：一對相鄰透鏡表面之間的曲率半徑差與該相鄰透鏡表面中較大曲率半徑的比值<0.01。 In this embodiment, the first lens group Grp1 includes a first lens 1 , a second lens 2 and a third lens 3 . The second lens group Grp2 includes a fourth lens 4 , a fifth lens 5 , a sixth lens 6 and a seventh lens 7 . The second lens group Grp3 includes an eighth lens 8 , a ninth lens 9 , a tenth lens 10 , an eleventh lens 11 , a twelfth lens 12 , a thirteenth lens 13 and a fourteenth lens 14 . The third lens group Grp3 includes at least two pairs of adjacent lens surfaces, in which the reduction side surface S18 of the ninth lens 9 and the magnification side surface S18 of the tenth lens 10 are a pair of adjacent lens surfaces, and the reduction side surface of the tenth lens 10 S19 and the magnification side surface S19 of the eleventh lens 11 are a pair of adjacent lens surfaces, and the reduction side surface S22 of the twelfth lens 12 and the magnification side surface S22 of the thirteenth lens 13 are a pair of adjacent lens surfaces. Each pair of adjacent lens surfaces meets the following conditions: the ratio of the difference in radius of curvature between a pair of adjacent lens surfaces to the larger radius of curvature of the adjacent lens surface is <0.01.

本實施例的定焦投影鏡頭PL的相關光學數值詳列於後附的表6及表7中。 The relevant optical values of the fixed-focus projection lens PL of this embodiment are detailed in the attached Tables 6 and 7.

本發明的第六實施例的定焦投影鏡頭的示意圖請參照圖6A，其詳細光學數據請參照圖6B以及表6及表7中所示。本發明的第七實施例至第十六實施例的定焦投影鏡頭的示意圖及其詳細光學數據請參照圖7A至圖16B以及表6及表7中所示。 Please refer to FIG. 6A for a schematic diagram of a fixed-focus projection lens according to the sixth embodiment of the present invention, and please refer to FIG. 6B and Tables 6 and 7 for its detailed optical data. For schematic diagrams of fixed-focus projection lenses according to the seventh to sixteenth embodiments of the present invention and their detailed optical data, please refer to FIGS. 7A to 16B and Tables 6 and 7.

表6及表7列出第一實施例至第十六實施例的定焦投影鏡頭PL的相關光學數值。 Table 6 and Table 7 list the relevant optical values of the fixed focus projection lenses PL from the first to sixteenth embodiments.

Figure 110122472-A0305-02-0030-14
Figure 110122472-A0305-02-0030-14

Figure 110122472-A0305-02-0030-16
Figure 110122472-A0305-02-0030-16

綜上所述，本發明的實施例的定焦投影鏡頭，依據本說明書中上述的各光學元件的配置與條件關係，可以在系統總長限制 的情況下，維持定焦投影鏡頭良好的影像品質。此外，本發明的實施例也透過將定焦投影鏡頭區分為第一透鏡組、第二透鏡組和第三透鏡組，可更容易調焦，而提升鏡頭生產的效能與製造良率。 To sum up, the fixed-focus projection lens according to the embodiment of the present invention, according to the configuration and condition relationship of each optical element mentioned above in this specification, can be limited to the total length of the system. In this case, the good image quality of the fixed-focus projection lens is maintained. In addition, embodiments of the present invention also divide the fixed-focus projection lens into a first lens group, a second lens group, and a third lens group, making it easier to adjust the focus, thereby improving lens production efficiency and manufacturing yield.

雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。 Although the present invention has been disclosed above through embodiments, they are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the appended patent application scope.

0:光闌 0: aperture

1:第一透鏡 1: First lens

2:第二透鏡 2: Second lens

3:第三透鏡 3:Third lens

4:第四透鏡 4:Fourth lens

5:第五透鏡 5:Fifth lens

6:第六透鏡 6:Sixth lens

7:第七透鏡 7:Seventh lens

8:第八透鏡 8:Eighth lens

9:第九透鏡 9:Ninth lens

10:第十透鏡 10: Tenth lens

11:第十一透鏡 11:Eleventh lens

12:第十二透鏡 12:Twelfth lens

13:第十三透鏡 13: Thirteenth lens

A1:放大側 A1: Magnification side

A2:縮小側 A2: Reduced side

C1:第一平板 C1: First plate

C2:第二平板 C2: Second plate

C3:第三平板 C3: The third plate

E:光閥 E: light valve

G1:第一透鏡組 G1: First lens group

G2:第二透鏡組 G2: Second lens group

Grp1:第一透鏡組 Grp1: first lens group

Grp2:第二透鏡組 Grp2: Second lens group

Grp3:第三透鏡組 Grp3: Third lens group

I:光軸 I: optical axis

PL:定焦投影鏡頭 PL: fixed focus projection lens

S1、S2、S3、S4、S5、S6、S7、S8、S9、S10、S11、S12、S13、S14、S15、S16、S17、S18、S19、S20、S21、S22、S23、S24、S25、S26、S27、S28、S29、S30:面 S1, S2, S3, S4, S5, S6, S7, S8, S9, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20, S21, S22, S23, S24, S25, S26, S27, S28, S29, S30: Surface

Claims (12)

一種定焦投影鏡頭，包括：一第一透鏡組及一第二透鏡組，該第一透鏡組與該第二透鏡組以一鏡筒內徑最小位置區隔，且該第一透鏡組與該第二透鏡組自該定焦投影鏡頭的一放大側到一縮小側依序排列；其中，該第一透鏡組包含6至8片具有屈光度的透鏡且包括二個非球面透鏡表面；該第二透鏡組的屈光度為正，該第二透鏡組包含5至8片具有屈光度的透鏡且包括二個膠合面，且該些具有屈光度的透鏡皆為球面透鏡；且該定焦投影鏡頭滿足下列條件：0.6<D1/OAL1<0.8；其中，D1為該定焦投影鏡頭自該放大側數來的第一片透鏡的直徑，OAL1為該定焦投影鏡頭兩端的最外側透鏡表面之間的最短距離。 A fixed-focus projection lens includes: a first lens group and a second lens group, the first lens group and the second lens group are separated by a minimum position of the inner diameter of the lens barrel, and the first lens group and the The second lens group is arranged in sequence from a magnification side to a reduction side of the fixed-focus projection lens; wherein, the first lens group includes 6 to 8 lenses with diopter and includes two aspherical lens surfaces; the second lens group The refractive power of the lens group is positive, the second lens group contains 5 to 8 lenses with refractive power and includes two cemented surfaces, and these lenses with refractive power are all spherical lenses; and the fixed-focus projection lens meets the following conditions: 0.6<D1/OAL1<0.8; where D1 is the diameter of the first lens of the fixed-focus projection lens from the magnification side, and OAL1 is the shortest distance between the outermost lens surfaces at both ends of the fixed-focus projection lens. 如請求項1所述的定焦投影鏡頭，其中該定焦投影鏡頭的膠合透鏡中的正屈光度透鏡的阿貝數大於70，且該定焦投影鏡頭的膠合透鏡中的負屈光度透鏡的阿貝數小於40且折射率大於或等於1.8。 The fixed-focus projection lens as claimed in claim 1, wherein the Abbe number of the positive refractive power lens in the cemented lens of the fixed-focus projection lens is greater than 70, and the Abbe number of the negative refractive power lens in the cemented lens of the fixed-focus projection lens is greater than 70. The number is less than 40 and the refractive index is greater than or equal to 1.8. 如請求項1所述的定焦投影鏡頭，其中該第二透鏡組中包含至少4片正屈光度透鏡。 The fixed focus projection lens of claim 1, wherein the second lens group includes at least 4 positive diopter lenses. 一種定焦投影鏡頭，包括： 一第一透鏡組、一第二透鏡組和一第三透鏡組，該第一透鏡組、該第二透鏡組和該第三透鏡組自該定焦投影鏡頭的一放大側到一縮小側依序排列，且該第一透鏡組和該第三透鏡組為固定透鏡組，該第二透鏡組為可動透鏡組；其中，該定焦投影鏡頭的一鏡筒內徑最小位置設置於該第二透鏡組至該第三透鏡組最外側透鏡之間；該第一透鏡組包括兩個非球面透鏡表面；該第三透鏡組包含6至9片具有屈光度的透鏡，且該些具有屈光度的透鏡皆為球面鏡片，且該第三透鏡組包括兩對相鄰透鏡表面共兩處，其中每處的該兩對相鄰透鏡表面各自符合以下條件：該相鄰透鏡表面之間的曲率半徑差與該相鄰透鏡表面中較大曲率半徑的比值<0.01；且該定焦投影鏡頭總共包含11至16片具有屈光度的透鏡，且該定焦投影鏡頭滿足下列條件：2<D1/DL<4；其中，D1為該定焦投影鏡頭自該放大側數來的第一片透鏡的直徑，DL為該定焦投影鏡頭自該放大側數來的最後一片透鏡的直徑。 A fixed-focus projection lens, including: A first lens group, a second lens group and a third lens group. The first lens group, the second lens group and the third lens group are arranged in sequence from a magnification side to a reduction side of the fixed focus projection lens. The first lens group and the third lens group are arranged in sequence, and the first lens group and the third lens group are fixed lens groups, and the second lens group is a movable lens group; wherein, the minimum inner diameter position of a lens barrel of the fixed focus projection lens is set at the second lens group. Between the lens group and the outermost lens of the third lens group; the first lens group includes two aspherical lens surfaces; the third lens group includes 6 to 9 lenses with diopter, and these lenses with diopter are all It is a spherical lens, and the third lens group includes two pairs of adjacent lens surfaces at two locations, where the two pairs of adjacent lens surfaces at each location meet the following conditions: the difference in curvature radius between the adjacent lens surfaces and the The ratio of the larger curvature radii of adjacent lens surfaces is <0.01; and the fixed-focus projection lens contains a total of 11 to 16 lenses with diopter, and the fixed-focus projection lens meets the following conditions: 2<D1/DL<4; where , D1 is the diameter of the first lens of the fixed-focus projection lens from the magnification side, and DL is the diameter of the last lens of the fixed-focus projection lens from the magnification side. 一種定焦投影鏡頭，包括：11至15片具有屈光度的透鏡，其中該些透鏡自一放大側到一縮小側該定焦投影鏡頭的依序排列為一固定的第一透鏡組、一可動的第二透鏡組和一固定的第三透鏡組；及 一光闌(aperture)，設置於該第二透鏡組中自該放大側數來的最後一片透鏡到該第三透鏡組中自該放大側數來的最後一片透鏡之間；該第一透鏡組包括兩個非球面透鏡表面；該第三透鏡組包含6至9片具有屈光度的透鏡，該第三透鏡組中包括兩對相鄰透鏡表面形狀實質對應的透鏡組合；且該定焦投影透鏡滿足以下二個條件：(1)2<D1/DL<4；及(2)0.06<TH23/OAL2<0.32；其中，D1為該定焦投影鏡頭自該放大側數來的第一片透鏡的直徑，DL為該定焦投影鏡頭自該放大側數來的最後一片透鏡的直徑，TH23為該第二透鏡組與該第三透鏡組之間的最短距離，OAL2為該定焦投影鏡頭兩端的最外側透鏡表面之間在一光軸上的距離。 A fixed-focus projection lens, including: 11 to 15 lenses with diopter, wherein the lenses are arranged in sequence from a magnification side to a reduction side as a fixed first lens group, a movable a second lens group and a fixed third lens group; and an aperture, disposed between the last lens in the second lens group counting from the magnification side to the last lens in the third lens group counting from the magnification side; the first lens group It includes two aspherical lens surfaces; the third lens group includes 6 to 9 lenses with diopter, and the third lens group includes two pairs of adjacent lens surface shapes that substantially correspond to the lens combination; and the fixed-focus projection lens satisfies The following two conditions: (1) 2<D1/DL<4; and (2) 0.06<TH23/OAL2<0.32; where D1 is the diameter of the first lens of the fixed-focus projection lens from the magnification side , DL is the diameter of the last lens of the fixed-focus projection lens from the magnification side, TH23 is the shortest distance between the second lens group and the third lens group, and OAL2 is the shortest distance between the two ends of the fixed-focus projection lens. The distance between outer lens surfaces on an optical axis. 如請求項5所述的定焦投影鏡頭，其中相鄰透鏡表面形狀實質對應的透鏡組合係指該相鄰透鏡表面之間的曲率半徑差與該相鄰透鏡表面中較大曲率半徑的比值<0.01。 The fixed-focus projection lens as described in claim 5, wherein the lens combination with substantially corresponding shapes of adjacent lens surfaces refers to the ratio of the difference in curvature radius between the adjacent lens surfaces to the larger radius of curvature in the adjacent lens surfaces < 0.01. 如請求項1、4或5所述的定焦投影鏡頭，其中該定焦投影鏡頭為玻塑混合鏡頭。 The fixed-focus projection lens as described in claim 1, 4 or 5, wherein the fixed-focus projection lens is a glass-plastic hybrid lens. 如請求項1、4或5所述的定焦投影鏡頭，其中該定焦投影鏡頭滿足下列條件至少其中之一：(1)該定焦投影鏡頭的系統總長(TTL)與該定焦投影鏡頭的有效焦距(EFL)的比值落在19到25的範圍內； (2)該定焦投影鏡頭的半視場角(HFOV)與該定焦投影鏡頭的有效焦距(EFL)的比值落在9到11.5的範圍內；(3)該定焦投影鏡頭的系統總長小於130毫米；(4)該定焦投影鏡頭的光圈值落在小於2的範圍內。 The fixed-focus projection lens as described in claim 1, 4 or 5, wherein the fixed-focus projection lens meets at least one of the following conditions: (1) The total system length (TTL) of the fixed-focus projection lens and the fixed-focus projection lens The effective focal length (EFL) ratio falls in the range of 19 to 25; (2) The ratio of the half field angle (HFOV) of the fixed-focus projection lens to the effective focal length (EFL) of the fixed-focus projection lens falls within the range of 9 to 11.5; (3) The total system length of the fixed-focus projection lens Less than 130 mm; (4) The aperture value of the fixed-focus projection lens falls within the range of less than 2. 如請求項1、4或5所述的定焦投影鏡頭，其中該定焦投影鏡頭滿足下列條件至少其中之一：(1)該定焦投影鏡頭至少包括兩片塑膠鏡片；(2)該定焦投影鏡頭自該放大側數來的該第一片透鏡為非球面透鏡。 The fixed-focus projection lens as described in claim 1, 4 or 5, wherein the fixed-focus projection lens meets at least one of the following conditions: (1) the fixed-focus projection lens includes at least two plastic lenses; (2) the fixed-focus projection lens The first lens counted from the magnifying side of the focal projection lens is an aspherical lens. 如請求項4或5所述的定焦投影鏡頭，其中該定焦投影鏡頭滿足下列條件至少其中之一：(1)該第一透鏡組中包含至少二個負屈光度透鏡；(2)該第一透鏡組不包括膠合透鏡；(3)該第二透鏡組中最靠近縮小側的表面為凸面，且其表面屈光度為正。 The fixed-focus projection lens as described in claim 4 or 5, wherein the fixed-focus projection lens meets at least one of the following conditions: (1) the first lens group contains at least two negative diopter lenses; (2) the third lens group One lens group does not include a cemented lens; (3) the surface of the second lens group closest to the reduction side is convex, and its surface refractive power is positive. 如請求項4或5所述的定焦投影鏡頭，其中該定焦投影鏡頭的縮小側設置有一光閥，且該定焦投影鏡頭以下述方式之一達成調焦：該第一透鏡組相對於該光閥在該光軸上移動，該第二透鏡組與該第三透鏡組相對於該光閥固定；該第二透鏡組相對於該光閥在該光軸上移動，該第一透鏡組與該第三透鏡組相對於該光閥固定；或 該第一透鏡組與該第二透鏡組同時分別相對於該光閥在該光軸上移動，該第三透鏡組相對於該光閥固定。 The fixed-focus projection lens according to claim 4 or 5, wherein a light valve is provided on the reduction side of the fixed-focus projection lens, and the fixed-focus projection lens achieves focusing in one of the following ways: the first lens group is relative to The light valve moves on the optical axis, the second lens group and the third lens group are fixed relative to the light valve; the second lens group moves on the optical axis relative to the light valve, and the first lens group The third lens group is fixed relative to the light valve; or The first lens group and the second lens group respectively move on the optical axis relative to the light valve at the same time, and the third lens group is fixed relative to the light valve. 如請求項1、4或5所述的定焦投影鏡頭，其中該定焦投影鏡頭自該放大側數來的該第一片透鏡為負屈光度透鏡。 The fixed-focus projection lens as claimed in claim 1, 4 or 5, wherein the first lens of the fixed-focus projection lens from the magnifying side is a negative diopter lens.
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