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

fCdd,,,}  
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。 `,gGmh  
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。

o^hI\9  
    PROJ                ! start project timer 6!bp;iLKy  
    CCW                 ! clear command window Fk@A;22N  
    CORE 16             ! use 16 cores for speed :Fz;nG-G  
    DSEARCH 1 QUIET      ! start DSEARCH; put best lens in library location 1 v!n\A}^:  
    SYSTEM                ! define the system specs +ntrp='7O7  
    ID DSEARCH ASPHERIC CAMERA LENS ! identification 8d|omqe~P  
    OBB 0 41.3 .285     ! infinite object, semi field 41.3 degrees, semi ap. 0.285 99w;Q 2k  
    UNI MM           ! lens will be in millimeters LW<DhMV  
    WAVL CDF          ! use visual wavelengths at C, d, and F lines WPi^;c8  
    END           ! end of system section 0g}+%5]yg  
DG,CL8bv  
    GOALS           ! define the goals here  =+9.X8SP  
    ELEMENTS 5       ! we want a four-element lens with a cover glass F(c~D0  
    BACK 0.4 SET      ! ask for 0.4 mm back focus distance eIBHAdU+g/  
    FNUM 2.7 10       ! ask for F/2.7, weight of 10 X~|P  
    THSTART 1          ! global search use thicknesses 1 mm l!CWE  
    RSTART 30          ! and starting radius of 30 mm hbRDM'  
    ASPH Q           ! use conic constant even in quick mode >=Hm2daN  
    ASPH 3           ! allow three aspheric terms: CC, 4th, 6th power of aperture Rp$t;=SMD  
_9!*laR!2  
    DELAY OFF          ! these runs are fast, so don’t ask to continue on timeout NBHS   
    ANNEAL 10 1 Q      ! anneal each case, temp 10 degrees, cool 1, including quick wQbN5*82  
    SNAP 5             ! redraw PAD screen every five passes 5$Lo]H*  
    STOP FIRST      ! put the stop in front SQ!wq  
    STOP FIXED      ! and keep it there  SbQ Ri  
    QUICK 50 50      ! run quick mode 50 passes, then real mode 50 to{/@^ D  
    NGRID 6          ! 6x6 grid of rays in pupil "S#4  
    NPASS 50           ! 50 passes in the MACro when finished os6p1"_\f  
    TOPD           ! correct both transverse aberrations and OPDs m8'B7|s  
    FOV 0.2.4.6.8 1     ! correct six field points qOy3D~  
    FWT 5 4 3 3 3 3     ! with these weights ?O(KmDH  
    COVER .3 1.51872 64 ! the cover glass will be 0.3 mm thick with this GLM ^%l~

|w  
    PLASTIC 1 3 5 7     ! the four elements will be plastic V^fSrW]  
    END                   ! end of goals section M,xhQ{eBY  
c@9jc^CJ  
    SPECIAL AANT        ! start of special AANT section; these go into the merit fn. GyI(1OAW  
    ACC 1.0             ! center thickness no more than 1.0 mm ^DVj_&~  
    ACM .2 .1 .2        ! and no thinner than 0.2 mm (O{5L(  
    ACA 60              ! avoid critical angle; 60 degrees from surface normal .BN~9w  
    AEC .2 .1 .2        ! keep edges over 0.2 mm fDyFkhc  
    M 1.35 10 A P YA 1  ! target the chief ray at three field points /*3
[9,  
    M .945 10 A P YA .7 ! to control distortion .3WDtVE  
    M .54 10 A P YA .4 qjcy{@ j  
    END                 ! end of AANT section cpz'upVOZ  
    GO                  ! DSEARCH runs }YUUCq&  
    PROJ                ! when it is finished, see how long the run took.

~5Wr |qg%{  
    GNO     0.000000     0.094362      6  M     0.700000 8BZTHlUB  
    GNO     0.000000     0.094362      6  M     0.900000

9^l[d<  
    VY 1 G 10 ^]mwL)I}  
    VY 2 G 10 |rJ1/T.9  
    VY 3 G 10 9L3#aE]C  
    VY 4 G 10

p x;X}Cd  
    M 0 .5 A P OPD 1 0 1

sO7$
b@"u.  
    FN 0 FN 1

l:NEK`>i  
    SKIP 9/Q_Jv-Q  
    M 1.35 10 A P YA 1 M .945 10 A P YA .7 9( ;lcOz  
    M .54 10 A P YA .4 v=Ep
  
    EOS

cVv>"oF;~*  
    M    1 1 A P ILLUM .2 mo%9UL,#W  
    M 1 1 A P ILLUM .4 .<JD'%?"  
    M 1 1 A P ILLUM .6 W]|;ZzZ=m  
    M 1 1 A P ILLUM .8 W-mi1l^H{  
    M 1 1 A P ILLUM 1

zo66=vE!  
    MI +gb2>fei&  
    MII    0 1 A P OPD 1 0 -1

T xRa&1  
    M0 1 A P OPD 1 0 -1

@Tmqw(n{  
    ILLUM 500 P

ai"Kd=R  
    GDIS  21 G