SYNOPSYS 光学设计软件课程四十：从Scratch开始的非球面相机镜头

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在开发一款现代手机镜头或针孔间谍相机时，设计师们越来越多地使用非球面。它们通常是很小的塑胶元件，尽管制作模具很昂贵，但镜头可以大量生产，成本很低。甚至可以用法兰机直接模压到元件上，使组装更简单，这种方法可以使某些元件尺寸保持在非常小的公差范围内。 W$z#ssr  
为帮助设计此类系统，DSEARCH™可以对具有非球面的系统进行全局搜索。 建议用户阅读SYNOPSYS™用户手册中关于这一强大功能的介绍。 我们在此给出一个如何将DSEARCH用于典型系统的示例。

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    PROJ                ! start project timer #'J~Xk   
    CCW                 ! clear command window 5h|'DOx|o  
    CORE 16             ! use 16 cores for speed <)_:NRjBF&  
    DSEARCH 1 QUIET      ! start DSEARCH; put best lens in library location 1 **T:eI+  
    SYSTEM                ! define the system specs 51&|t#8h  
    ID DSEARCH ASPHERIC CAMERA LENS ! identification 8_"3Yb`f  
    OBB 0 41.3 .285     ! infinite object, semi field 41.3 degrees, semi ap. 0.285 hf_R\C(c  
    UNI MM           ! lens will be in millimeters ..??O^  
    WAVL CDF          ! use visual wavelengths at C, d, and F lines "%:7j!#X|I  
    END           ! end of system section _n< LVdE  
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    GOALS           ! define the goals here jmR
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    ELEMENTS 5       ! we want a four-element lens with a cover glass tW:W&|q  
    BACK 0.4 SET      ! ask for 0.4 mm back focus distance P7}t lHX  
    FNUM 2.7 10       ! ask for F/2.7, weight of 10 AU0$A403  
    THSTART 1          ! global search use thicknesses 1 mm S#P+B*v  
    RSTART 30          ! and starting radius of 30 mm u
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    ASPH Q           ! use conic constant even in quick mode |*%/ovg+  
    ASPH 3           ! allow three aspheric terms: CC, 4th, 6th power of aperture |2qR^Hd&5  
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    DELAY OFF          ! these runs are fast, so don’t ask to continue on timeout 6eD(dZ  
    ANNEAL 10 1 Q      ! anneal each case, temp 10 degrees, cool 1, including quick ?$<SCN=  
    SNAP 5             ! redraw PAD screen every five passes K{|w 43>D  
    STOP FIRST      ! put the stop in front W=~id"XtJ  
    STOP FIXED      ! and keep it there Bp&6x;MJf  
    QUICK 50 50      ! run quick mode 50 passes, then real mode 50 _mw13jcN]  
    NGRID 6          ! 6x6 grid of rays in pupil NV:>a  
    NPASS 50           ! 50 passes in the MACro when finished j?=VtVP  
    TOPD           ! correct both transverse aberrations and OPDs ; Zh9^0  
    FOV 0.2.4.6.8 1     ! correct six field points :[L{KFQU  
    FWT 5 4 3 3 3 3     ! with these weights D._{E*vg  
    COVER .3 1.51872 64 ! the cover glass will be 0.3 mm thick with this GLM $RpFxi  
    PLASTIC 1 3 5 7     ! the four elements will be plastic +z+F-  
    END                   ! end of goals section mRwXN*Izw  
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    SPECIAL AANT        ! start of special AANT section; these go into the merit fn. -
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    ACC 1.0             ! center thickness no more than 1.0 mm I9;xzES  
    ACM .2 .1 .2        ! and no thinner than 0.2 mm
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    ACA 60              ! avoid critical angle; 60 degrees from surface normal %=y;L:S\p  
    AEC .2 .1 .2        ! keep edges over 0.2 mm m[8IEKo  
    M 1.35 10 A P YA 1  ! target the chief ray at three field points 7kdeYr~<1  
    M .945 10 A P YA .7 ! to control distortion ,cLH
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    M .54 10 A P YA .4 ]Fxku<z7|  
    END                 ! end of AANT section >Q&CgGpW$  
    GO                  ! DSEARCH runs aXC!t  
    PROJ                ! when it is finished, see how long the run took.

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    GNO     0.000000     0.094362      6  M     0.900000

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