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。 ekC 1wN l  
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 \Fg%V>  
    CCW                 ! clear command window <y[LdB/a  
    CORE 16             ! use 16 cores for speed ,Z*&QR  
    DSEARCH 1 QUIET      ! start DSEARCH; put best lens in library location 1 b>SG5EqU@  
    SYSTEM                ! define the system specs nR'!Ui  
    ID DSEARCH ASPHERIC CAMERA LENS ! identification K}7E;O5m"  
    OBB 0 41.3 .285     ! infinite object, semi field 41.3 degrees, semi ap. 0.285 ln.'}P  
    UNI MM           ! lens will be in millimeters Qc1NLU9:  
    WAVL CDF          ! use visual wavelengths at C, d, and F lines mh&wvT<:{  
    END           ! end of system section pFb}5Q  
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    GOALS           ! define the goals here mU@pRjq=  
    ELEMENTS 5       ! we want a four-element lens with a cover glass dC+WII`V  
    BACK 0.4 SET      ! ask for 0.4 mm back focus distance r Q)?Bhf  
    FNUM 2.7 10       ! ask for F/2.7, weight of 10 Z./$}tVUG  
    THSTART 1          ! global search use thicknesses 1 mm 5hN)y-4@  
    RSTART 30          ! and starting radius of 30 mm RlW0U-%u  
    ASPH Q           ! use conic constant even in quick mode %L(;}sJ.  
    ASPH 3           ! allow three aspheric terms: CC, 4th, 6th power of aperture 'w//d $+G_  
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    DELAY OFF          ! these runs are fast, so don’t ask to continue on timeout fNR2(8;}  
    ANNEAL 10 1 Q      ! anneal each case, temp 10 degrees, cool 1, including quick @GTk
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    SNAP 5             ! redraw PAD screen every five passes i2.g}pM.A  
    STOP FIRST      ! put the stop in front 2OT RP4U  
    STOP FIXED      ! and keep it there ?RW7TWf  
    QUICK 50 50      ! run quick mode 50 passes, then real mode 50 ws}cMX]*  
    NGRID 6          ! 6x6 grid of rays in pupil *iLlBE  
    NPASS 50           ! 50 passes in the MACro when finished 2kukQj(n  
    TOPD           ! correct both transverse aberrations and OPDs 4-j3&
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    FOV 0.2.4.6.8 1     ! correct six field points HK}br!?  
    FWT 5 4 3 3 3 3     ! with these weights 4mHR+SZy  
    COVER .3 1.51872 64 ! the cover glass will be 0.3 mm thick with this GLM DpD19)ouy  
    PLASTIC 1 3 5 7     ! the four elements will be plastic Yf1&"WW4  
    END                   ! end of goals section U-^qVlw  
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    SPECIAL AANT        ! start of special AANT section; these go into the merit fn. 1,Ams  
    ACC 1.0             ! center thickness no more than 1.0 mm \vg(@)$q   
    ACM .2 .1 .2        ! and no thinner than 0.2 mm gR5 EK$  
    ACA 60              ! avoid critical angle; 60 degrees from surface normal
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    AEC .2 .1 .2        ! keep edges over 0.2 mm  9t$#!2z  
    M 1.35 10 A P YA 1  ! target the chief ray at three field points .,({&L  
    M .945 10 A P YA .7 ! to control distortion <O<Kf:i&c1  
    M .54 10 A P YA .4 HpLCOY1-  
    END                 ! end of AANT section ws/e~ T<c  
    GO                  ! DSEARCH runs -d-vzri  
    PROJ                ! when it is finished, see how long the run took.

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    GNO     0.000000     0.094362      6  M     0.700000 zG\& ZU  
    GNO     0.000000     0.094362      6  M     0.900000

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