TWI427353B - Projection zoom lens - Google Patents
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- TWI427353B TWI427353B TW100103068A TW100103068A TWI427353B TW I427353 B TWI427353 B TW I427353B TW 100103068 A TW100103068 A TW 100103068A TW 100103068 A TW100103068 A TW 100103068A TW I427353 B TWI427353 B TW I427353B
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Description
本發明涉及一種變焦投影鏡頭。 The present invention relates to a zoom projection lens.
隨著半導體技術的發展，各種投影儀，例如數位光處理(Digital Light Processing,DLP)投影儀、液晶顯示(Liquid Crystal Display,LCD)投影儀及矽晶(Liquid Crystal on Silicon,LCoS)投影儀，採用的空間光調製器(Spatial light modulator，SLM)，例如數位微鏡晶片(Digital micro-mirror device,DMD)、液晶顯示面板(LCD panel)及矽晶晶片(LCoS chip)在提高圖元的同時，朝小型化方向發展，以此滿足消費者對投影畫面品質的要求及便攜性的要求。因此，對應於空間光調製器的圖元要求以及尺寸要求，應用在投影儀中的變焦投影鏡頭(一般對應設置在空間光調製器前面)也需要在保證良好投影畫面品質的同時縮小尺寸。 With the development of semiconductor technology, various projectors, such as digital light processing (DLP) projectors, liquid crystal display (LCD) projectors, and liquid crystal on silicon (LCoS) projectors, A spatial light modulator (SLM), such as a digital micro-mirror device (DMD), a liquid crystal display panel (LCD panel), and an LCoS chip, is used to enhance the primitives. In the direction of miniaturization, it meets the requirements of consumers for the quality of projection screens and portability. Therefore, corresponding to the primitive requirements and size requirements of the spatial light modulator, the zoom projection lens (generally disposed in front of the spatial light modulator) applied to the projector also needs to be downsized while ensuring good projected picture quality.
有鑒於此，有必要提供一種投影品質高而且小型化的變焦投影鏡頭。 In view of this, it is necessary to provide a zoom projection lens with high projection quality and miniaturization.
一種變焦投影鏡頭，沿其光軸方向從放大端到縮小端依序包括一負光焦度的第一透鏡群及一正光焦度的第二透鏡群。該第一透鏡群包括一負光焦度的第一透鏡。該第二透鏡群沿該光軸方向從放 大端到縮小端依序包括一正光焦度的第二透鏡、一正光焦度的第三透鏡、一負光焦度的第四透鏡和一正光焦度的第五透鏡。該變焦投影鏡頭在廣角端到攝遠端變換過程中，該第一透鏡群及該第二透鏡群均沿該光軸移動。該變焦投影鏡頭滿足以下條件式：(1)1.9<|F1/Fw|<2.1 A zoom projection lens includes a first lens group of negative refractive power and a second lens group of positive refractive power sequentially from an enlarged end to a reduced end along an optical axis direction thereof. The first lens group includes a first lens of negative power. The second lens group is placed along the optical axis direction The big end to the reduced end sequentially includes a second lens of positive power, a third lens of positive power, a fourth lens of negative power, and a fifth lens of positive power. During the zoom projection lens, the first lens group and the second lens group move along the optical axis during the wide-angle end to the telephoto end conversion. The zoom projection lens satisfies the following conditional formula: (1) 1.9 <|F1/Fw|<2.1
(2)0.5<|f4/Fw|<0.8 (2)0.5<|f4/Fw|<0.8
(3)0.95<|f5/Fw|<1.2 (3)0.95<|f5/Fw|<1.2
其中，F1為該第一透鏡群的有效焦距，f4為該第四透鏡的有效焦距，f5為該第五透鏡的有效焦距，Fw為該變焦投影鏡頭在廣角端的有效焦距。 Wherein F1 is the effective focal length of the first lens group, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and Fw is the effective focal length of the zoom projection lens at the wide-angle end.
上述三個條件式對第一透鏡群及第二透鏡群的光焦度的合理分配，使得變焦投影鏡頭的像散和球差在得到有效控制進而提高投影品質的同時，變焦投影鏡頭也較小型化。 The above three conditional expressions reasonably distribute the power of the first lens group and the second lens group, so that the astigmatism and spherical aberration of the zoom projection lens are effectively controlled to improve the projection quality, and the zoom projection lens is also smaller. Chemical.
10‧‧‧變焦投影鏡頭 10‧‧‧ zoom projection lens
100‧‧‧第一透鏡群 100‧‧‧First lens group
200‧‧‧第二透鏡群 200‧‧‧second lens group
300‧‧‧成像面 300‧‧‧ imaging surface
102‧‧‧第一透鏡 102‧‧‧First lens
202‧‧‧第二透鏡 202‧‧‧second lens
204‧‧‧第三透鏡 204‧‧‧ third lens
206‧‧‧第四透鏡 206‧‧‧Fourth lens
208‧‧‧第五透鏡 208‧‧‧ fifth lens
20‧‧‧光闌 20‧‧‧Light
400‧‧‧玻璃片 400‧‧‧Stainless glass
S1~S12‧‧‧第一表面至第十二表面 S1~S12‧‧‧first surface to twelfth surface
圖1為本發明的變焦投影鏡頭處於廣角端狀態時的結構示意圖。 1 is a schematic view showing the structure of a zoom projection lens of the present invention in a wide-angle end state.
圖2為本發明的變焦投影鏡頭處於攝遠端狀態時的結構示意圖。 2 is a schematic structural view of the zoom projection lens of the present invention in a telephoto end state.
圖3為圖1的變焦投影鏡頭的球面像差圖。 3 is a spherical aberration diagram of the zoom projection lens of FIG. 1.
圖4為圖1的變焦投影鏡頭的場曲圖。 4 is a field curvature diagram of the zoom projection lens of FIG. 1.
圖5為圖1的變焦投影鏡頭的畸變圖。 FIG. 5 is a distortion diagram of the zoom projection lens of FIG. 1. FIG.
圖6為圖1的變焦投影鏡頭的橫向色差圖。 6 is a lateral chromatic aberration diagram of the zoom projection lens of FIG. 1.
圖7為圖2的變焦投影鏡頭的球面像差圖。 FIG. 7 is a spherical aberration diagram of the zoom projection lens of FIG. 2. FIG.
圖8為圖2的變焦投影鏡頭的場曲圖。 FIG. 8 is a field curvature diagram of the zoom projection lens of FIG. 2. FIG.
圖9為圖2的變焦投影鏡頭的畸變圖。 9 is a distortion diagram of the zoom projection lens of FIG. 2.
圖10為圖2的變焦投影鏡頭的橫向色差圖。 FIG. 10 is a lateral chromatic aberration diagram of the zoom projection lens of FIG. 2. FIG.
下面將結合附圖，舉以下較佳實施方式並配合圖式詳細描述如下。 The following preferred embodiments will be described in detail below with reference to the accompanying drawings.
請參閱圖1，其為本發明較佳實施方式的變焦投影鏡頭10沿其光軸方向從放大端至縮小端(近SLM端)依次包括一具有負光焦度的第一透鏡群100、一具有正光焦度的第二透鏡群200及及一成像面300。 Referring to FIG. 1 , a zoom projection lens 10 according to a preferred embodiment of the present invention includes a first lens group 100 having a negative refractive power in a sequence from an enlarged end to a reduced end (near the SLM end) in the optical axis direction thereof. A second lens group 200 having positive power and an imaging surface 300.
第一透鏡群100包括一負光焦度的第一透鏡102。第一透鏡102包括一靠近放大端的第一表面S1以及一靠近縮小端的第二表面S2。 The first lens group 100 includes a first lens 102 of negative power. The first lens 102 includes a first surface S1 near the enlarged end and a second surface S2 near the reduced end.
第二透鏡群200沿光軸方向從放大端到縮小端依序包括一正光焦度的第二透鏡202、一正光焦度的第三透鏡204、一負光焦度的第四透鏡206和一正光焦度的第五透鏡208。第二透鏡202包括一靠近放大端的第三表面S3以及一靠近縮小端的第四表面S4。第三透鏡204包括一靠近放大端的第五表面S5以及一靠近縮小端的第六表面S6。第四透鏡206包括一靠近放大端的第七表面S7以及一靠近縮小端的第八表面S8。第五透鏡208包括一靠近放大端的第九表面S9以及一靠近縮小端的第十表面S10。 The second lens group 200 sequentially includes a second lens 202 of positive power, a third lens 204 of positive power, a fourth lens 206 of one negative power, and one from the enlarged end to the reduced end in the optical axis direction. A fifth lens 208 of positive power. The second lens 202 includes a third surface S3 adjacent to the enlarged end and a fourth surface S4 near the reduced end. The third lens 204 includes a fifth surface S5 adjacent to the enlarged end and a sixth surface S6 near the reduced end. The fourth lens 206 includes a seventh surface S7 near the enlarged end and an eighth surface S8 near the reduced end. The fifth lens 208 includes a ninth surface S9 near the enlarged end and a tenth surface S10 near the reduced end.
變焦投影鏡頭10可應用於DLP投影機。投影時，SLM調製的投影信號光自一SLM表面93投射到變焦投影鏡頭10，光線依次經第二透鏡群200及第一透鏡群10，投射於螢幕(圖未示)上便可得到投影 畫面。變焦投影鏡頭在廣角端到攝遠端變換過程中，第一透鏡群100及第二透鏡群200均沿光軸移動。在本實施方式中，變焦投影鏡頭10實現1.1倍的變焦投影，所有透鏡的表面均為球面。 The zoom projection lens 10 can be applied to a DLP projector. During projection, the SLM-modulated projection signal light is projected from an SLM surface 93 to the zoom projection lens 10, and the light is sequentially passed through the second lens group 200 and the first lens group 10, and projected onto a screen (not shown) to be projected. Picture. In the zoom projection lens, the first lens group 100 and the second lens group 200 move along the optical axis during the wide-angle end to the telephoto end conversion. In the present embodiment, the zoom projection lens 10 achieves a zoom projection of 1.1 times, and the surfaces of all the lenses are spherical.
為實現小型化的要求，變焦投影鏡頭10滿足以下條件式：(1)1.9<|F1/Fw|<2.1；(2)0.5<|f4/Fw|<0.8；(3)0.95<|f5/Fw|<1.2。 In order to achieve miniaturization, the zoom projection lens 10 satisfies the following conditional formula: (1) 1.9 <|F1/Fw|<2.1; (2) 0.5 <|f4/Fw|<0.8; (3) 0.95<|f5/ Fw|<1.2.
其中，F1為該第一透鏡群的有效焦距，f4為該第四透鏡的有效焦距，f5為該第五透鏡的有效焦距，Fw為該變焦投影鏡頭在廣角端的有效焦距。條件式(1)限制了變焦投影鏡頭10的光學總長。條件式(2)及(3)修正了場曲及像差。如此，該三個條件式對第一透鏡群100及第二透鏡群200的光焦度的合理分配，使得變焦投影鏡頭10的像散和球差在得到有效控制進而提高投影品質的同時，變焦投影鏡頭10也較小型化。 Wherein F1 is the effective focal length of the first lens group, f4 is the effective focal length of the fourth lens, f5 is the effective focal length of the fifth lens, and Fw is the effective focal length of the zoom projection lens at the wide-angle end. The conditional expression (1) limits the total optical length of the zoom projection lens 10. Conditional equations (2) and (3) correct field curvature and aberrations. In this way, the three conditional expressions properly distribute the optical power of the first lens group 100 and the second lens group 200, so that the astigmatism and spherical aberration of the zoom projection lens 10 are effectively controlled to improve the projection quality, and the zoom is performed. The projection lens 10 is also small in size.
優選地，變焦投影鏡頭100還滿足以下條件：(4)L*Φw<3.8。 Preferably, the zoom projection lens 100 further satisfies the following condition: (4) L*Φw<3.8.
其中，L為變焦投影鏡頭10位於廣角端時的光學總長，Φw為變焦投影鏡頭100位於廣角端時的光焦度。條件式(4)進一步限制了變焦投影鏡頭10的光學總長及變倍比(即，變焦投影鏡頭10在望遠端的有效焦距與廣角端的有效焦距之比)。 Wherein, L is the total optical length when the zoom projection lens 10 is located at the wide-angle end, and Φw is the power when the zoom projection lens 100 is located at the wide-angle end. The conditional expression (4) further limits the optical total length and zoom ratio of the zoom projection lens 10 (i.e., the ratio of the effective focal length of the zoom projection lens 10 at the telephoto end to the effective focal length at the wide angle end).
優選地，變焦投影鏡頭100還滿足以下條件：(5)w≧27°。 Preferably, the zoom projection lens 100 also satisfies the following condition: (5) w ≧ 27°.
其中，w為變焦投影鏡頭100位於廣角端半視場角。 Where w is the zoom projection lens 100 at a wide angle end half angle of view.
優選地，變焦投影鏡頭100還包括一設置於第三透鏡204與第四透鏡206間的光闌(Aperture stop)20，以限制經過進入第一透鏡群100的光通量。變焦投影鏡頭100在變焦過程中，光闌20隨第二透鏡群200一起移動，並且光闌孔徑保持不變。 Preferably, the zoom projection lens 100 further includes an aperture stop 20 disposed between the third lens 204 and the fourth lens 206 to limit the amount of light passing through the first lens group 100. The zoom projection lens 100 moves during the zooming process with the second lens group 200, and the pupil aperture remains unchanged.
優選地，變焦投影鏡頭100還包括一設置於第二透鏡群200與成像面300之間的玻璃片400，以保護變焦投影鏡頭100。玻璃片400包括一靠近放大端的第十一表面S11以及一靠近縮小端的第十二表面S12。 Preferably, the zoom projection lens 100 further includes a glass piece 400 disposed between the second lens group 200 and the imaging surface 300 to protect the zoom projection lens 100. The glass piece 400 includes an eleventh surface S11 near the enlarged end and a twelfth surface S12 near the reduced end.
本實施方式中，變焦投影鏡頭100的各光學元件滿足表1、表2的條件，其中，F1=-44.5，f4=-14.675，f5=23.96，Fw=22.1，L=83mm，Φw=0.045，w=26.95°。 In the present embodiment, the optical elements of the zoom projection lens 100 satisfy the conditions of Tables 1 and 2, wherein F1=-44.5, f4=-14.675, f5=23.96, Fw=22.1, L=83 mm, Φw=0.045, w = 26.95 °.
表1、表2中，約定R為對應表面的曲率半徑，D為對應表面到後一表面的軸上距離(兩個表面截得光軸的長度，下同)，Nd為對應透鏡組對d光(波長為587納米，下同)的折射率，Vd為d光在對應透鏡組的阿貝數(abbe number，下同)；f為變焦投影鏡頭100的有效焦距，L為變焦投影鏡頭100的光學總長，F#為光圈數，D1為第二表面S2到第三表面S3的軸上距離，D2為第十表面S10到成像面300的軸上距離。 In Tables 1 and 2, R is the radius of curvature of the corresponding surface, D is the on-axis distance from the corresponding surface to the latter surface (the length of the optical axis of the two surfaces, the same below), and Nd is the corresponding lens pair d The refractive index of light (wavelength is 587 nm, the same below), Vd is the Abbe number of the corresponding lens group (abbe number, the same below); f is the effective focal length of the zoom projection lens 100, and L is the zoom projection lens 100 The total optical length, F# is the number of apertures, D1 is the on-axis distance from the second surface S2 to the third surface S3, and D2 is the on-axis distance from the tenth surface S10 to the imaging surface 300.
表1
本實施方式的變焦投影鏡頭100處於廣角端時，其像差、場曲、畸變及橫向色差分別如圖3到圖6所示。圖3中，根據針對波長分別為460nm、550nm、610nm的光觀察到的球面像差曲線，變焦投 影鏡頭100處於廣角端時對可見光(波長範圍在400nm-700nm之間)產生的像差值控制在(-0.3mm，0.3mm)範圍內。圖4中，曲線T及S分別為子午場曲(tangential field curvature)特性曲線及弧矢場曲(sagittal field curvature)特性曲線。可見，子午場曲值和弧矢場曲值被控制在(-0.3mm，0.3mm)範圍內。而從圖5中可知，畸變量被控制在(-2%，0)範圍內。根據圖6，變焦投影鏡頭100對可見光產生的橫向色差值控制在(-4um，4um)範圍內。 When the zoom projection lens 100 of the present embodiment is at the wide-angle end, aberrations, field curvatures, distortions, and lateral chromatic aberrations are as shown in FIGS. 3 to 6, respectively. In FIG. 3, according to the spherical aberration curve observed for light having wavelengths of 460 nm, 550 nm, and 610 nm, the zoom projection is performed. When the shadow lens 100 is at the wide-angle end, the aberration value generated for visible light (wavelength ranging from 400 nm to 700 nm) is controlled within the range of (-0.3 mm, 0.3 mm). In Fig. 4, the curves T and S are the tangential field curvature characteristic curve and the sagittal field curvature characteristic curve, respectively. It can be seen that the meridional curvature value and the sagittal curvature value are controlled within the range of (-0.3 mm, 0.3 mm). As can be seen from Fig. 5, the distortion variable is controlled within the range of (-2%, 0). According to FIG. 6, the lateral color difference value of the zoom projection lens 100 for visible light is controlled within a range of (-4 um, 4 um).
本實施方式的變焦投影鏡頭100處於攝遠端時，其像差、場曲、畸變及橫向色差分別如圖7到圖10所示。圖7中，根據針對波長分別為460nm、550nm、610nm的光觀察到的球面像差曲線，變焦投影鏡頭100處於攝遠端時對可見光產生的像差值控制在(-0.3mm，0.3mm)範圍內。圖8中，子午場曲值和弧矢場曲值被控制在(-0.3mm，0.3mm)範圍內。而從圖9中可知，畸變量被控制在(-2%，0)範圍內。根據圖10，變焦投影鏡頭100對可見光產生的橫向色差值控制在(-4um，4um)範圍內。由此可見，變焦投影鏡頭100處於廣角端及攝影端時的球面像差、場曲、畸變及橫向色差都能被控制(修正)在較小的範圍內。 When the zoom projection lens 100 of the present embodiment is at the telephoto end, its aberration, curvature of field, distortion, and lateral chromatic aberration are as shown in FIGS. 7 to 10, respectively. In FIG. 7, according to the spherical aberration curve observed for light having wavelengths of 460 nm, 550 nm, and 610 nm, the aberration value of the visible light generated by the zoom projection lens 100 at the telephoto end is controlled at (-0.3 mm, 0.3 mm). Within the scope. In Fig. 8, the meridional field curvature value and the sagittal field curvature value are controlled within the range of (-0.3 mm, 0.3 mm). As can be seen from Fig. 9, the distortion variable is controlled within the range of (-2%, 0). According to FIG. 10, the lateral color difference value of the zoom projection lens 100 for visible light is controlled within a range of (-4 um, 4 um). It can be seen that the spherical aberration, field curvature, distortion, and lateral chromatic aberration of the zoom projection lens 100 at the wide-angle end and the photographic end can be controlled (corrected) in a small range.
本技術領域之普通技術人員應當認識到，以上之實施方式僅係用來說明本發明，而並非用作為對本發明之限定，只要在本發明之實質精神範圍之內，對以上實施例所作之適當改變和變化都落在本發明要求保護之範圍之內。 It should be understood by those skilled in the art that the above embodiments are merely illustrative of the invention, and are not intended to limit the invention, as the scope of the spirit of the invention Changes and modifications are intended to fall within the scope of the invention.
10‧‧‧變焦投影鏡頭 10‧‧‧ zoom projection lens
100‧‧‧第一透鏡群 100‧‧‧First lens group
200‧‧‧第二透鏡群 200‧‧‧second lens group
300‧‧‧成像面 300‧‧‧ imaging surface
102‧‧‧第一透鏡 102‧‧‧First lens
202‧‧‧第二透鏡 202‧‧‧second lens
204‧‧‧第三透鏡 204‧‧‧ third lens
206‧‧‧第四透鏡 206‧‧‧Fourth lens
208‧‧‧第五透鏡 208‧‧‧ fifth lens
20‧‧‧光闌 20‧‧‧Light
400‧‧‧玻璃片 400‧‧‧Stainless glass
S1~S12‧‧‧第一表面至第十二表面 S1~S12‧‧‧first surface to twelfth surface
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| TW100103068A TWI427353B (en) | 2011-01-27 | 2011-01-27 | Projection zoom lens |
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| TW100103068A TWI427353B (en) | 2011-01-27 | 2011-01-27 | Projection zoom lens |
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| TW201232087A TW201232087A (en) | 2012-08-01 |
| TWI427353B true TWI427353B (en) | 2014-02-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105892005A (en) * | 2015-01-26 | 2016-08-24 | 信泰光学(深圳)有限公司 | Projection lens |
| TWI624681B (en) * | 2015-05-14 | 2018-05-21 | 鴻海精密工業股份有限公司 | Wild angle focus lens |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008107798A (en) * | 2006-10-23 | 2008-05-08 | Young Optics Inc | Zoom lens |
| JP2009151319A (en) * | 2001-11-26 | 2009-07-09 | Olympus Corp | Zoom lens, and electronic imaging apparatus using the same |
| JP2010113150A (en) * | 2008-11-06 | 2010-05-20 | Fujinon Corp | Projection zoom lens and projection type display apparatus |
| JP2010249873A (en) * | 2009-04-10 | 2010-11-04 | Canon Inc | Optical system and image pickup apparatus using the same |
-
2011
- 2011-01-27 TW TW100103068A patent/TWI427353B/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009151319A (en) * | 2001-11-26 | 2009-07-09 | Olympus Corp | Zoom lens, and electronic imaging apparatus using the same |
| JP2008107798A (en) * | 2006-10-23 | 2008-05-08 | Young Optics Inc | Zoom lens |
| JP2010113150A (en) * | 2008-11-06 | 2010-05-20 | Fujinon Corp | Projection zoom lens and projection type display apparatus |
| JP2010249873A (en) * | 2009-04-10 | 2010-11-04 | Canon Inc | Optical system and image pickup apparatus using the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105892005A (en) * | 2015-01-26 | 2016-08-24 | 信泰光学(深圳)有限公司 | Projection lens |
| TWI624681B (en) * | 2015-05-14 | 2018-05-21 | 鴻海精密工業股份有限公司 | Wild angle focus lens |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201232087A (en) | 2012-08-01 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MM4A | Annulment or lapse of patent due to non-payment of fees |