SYNOPSYS 光學(xué)設(shè)計軟件課程四十：從Scratch開始的非球面相機(jī)鏡頭

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在開發(fā)一款現(xiàn)代手機(jī)鏡頭或針孔間諜相機(jī)時，設(shè)計師們越來越多地使用非球面。它們通常是很小的塑膠元件，盡管制作模具很昂貴，但鏡頭可以大量生產(chǎn)，成本很低。甚至可以用法蘭機(jī)直接模壓到元件上，使組裝更簡單，這種方法可以使某些元件尺寸保持在非常小的公差范圍內(nèi)。 x.!%'{+{  
為幫助設(shè)計此類系統(tǒng)，DSEARCH™可以對具有非球面的系統(tǒng)進(jìn)行全局搜索。 建議用戶閱讀SYNOPSYS™用戶手冊中關(guān)于這一強大功能的介紹。 我們在此給出一個如何將DSEARCH用于典型系統(tǒng)的示例。

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    PROJ                ! start project timer e4t'3So  
    CCW                 ! clear command window /Ue
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    CORE 16             ! use 16 cores for speed ~R3@GaL1  
    DSEARCH 1 QUIET      ! start DSEARCH; put best lens in library location 1 94Are<  
    SYSTEM                ! define the system specs J 5~bs*a8  
    ID DSEARCH ASPHERIC CAMERA LENS ! identification a *>$6H;  
    OBB 0 41.3 .285     ! infinite object, semi field 41.3 degrees, semi ap. 0.285 -(dc1?COi  
    UNI MM           ! lens will be in millimeters P@)zNik[  
    WAVL CDF          ! use visual wavelengths at C, d, and F lines C"K(-/  
    END           ! end of system section ><%z~s  
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    GOALS           ! define the goals here \7jK6;R<  
    ELEMENTS 5       ! we want a four-element lens with a cover glass A^xDAxk  
    BACK 0.4 SET      ! ask for 0.4 mm back focus distance //xxSk  
    FNUM 2.7 10       ! ask for F/2.7, weight of 10 c<|;<8ew  
    THSTART 1          ! global search use thicknesses 1 mm n"*A.  
    RSTART 30          ! and starting radius of 30 mm JS}iNS'X  
    ASPH Q           ! use conic constant even in quick mode *1|&uE&_R  
    ASPH 3           ! allow three aspheric terms: CC, 4th, 6th power of aperture =5is
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    DELAY OFF          ! these runs are fast, so don’t ask to continue on timeout YFeF(k!!n  
    ANNEAL 10 1 Q      ! anneal each case, temp 10 degrees, cool 1, including quick w\!aKeP'  
    SNAP 5             ! redraw PAD screen every five passes j8P=8w{  
    STOP FIRST      ! put the stop in front ~0eJ6i  
    STOP FIXED      ! and keep it there -Z9e}$q$,  
    QUICK 50 50      ! run quick mode 50 passes, then real mode 50 >yiK&LW^?  
    NGRID 6          ! 6x6 grid of rays in pupil g,*L