Abstract
The resolution performance of mobile phone camera optics was previously checked only near an infinite point. However, near-field performance is required because of reduced camera pixel sizes. Traditional optics are measured using a resolution chart located at a hyperfocal distance, which can only measure the resolution at a specific distance but not at close distances. We designed a new collimator system that can change the virtual image of the resolution chart from infinity to a short distance. Hence, some lenses inside the collimator systems must be moved. Currently, if the focusing lens is moved, chromatic aberration and field curvature occur. Additional lenses are required to correct this problem. However, the added lens must not change the characteristics of the proposed collimator. Therefore, an equivalent-lens conversion method was designed to maintain the first-order and Seidel aberrations. The collimator system proposed in this study does not move or change the resolution chart.
Highlights
Phone cameras released in the early 2000s had a very large pixel size because of the low number of pixels [1]
We propose a method that can measure the resolution according to the change in the object distance without moving the resolution chart
K is the refracting power of each lens group, which is reciprocal to the focal length of each lens group [18,19]. z is the distance between the lens groups, and u is the angle of the axial ray [20]. The subscripts of these variables indicate the number of lens group, and “0” indicates the object plane. k1–k3 indicate the refracting power of the lens group that constitutes the collimator system, and k is the refracting power of the optical system to be tested
Summary
Phone cameras released in the early 2000s had a very large pixel size because of the low number of pixels [1]. One of the common methods of checking a phone camera is to take a target, such as an ISO 12,233 resolution chart, using an optical system for the testing, and to check the various images inside the chart [11] At this time, the resolution can change according to the object distance of the tested optical system so that it can be evaluated. The space for measuring the resolution of the test lens increases as the inspection distance and resolution chart size increase Another method must be employed to solve this technical problem. To reduce this inspection space for mobile phone camera optics, we need to reduce the inspection distance For this technical issue, the optical system must be placed between the test lens and resolution chart. Sceocltliomna3topr.reHsenret,s kthies ltahyeoruetfroafcatinngabpeorwraetiroonf-bealcahnlceendscgorloliumpa,tworhsicyhstiesmreactipinroficnailtetoanthde cfloocsaelpleonsigttiohnosfteoavcehrliefynsthgerocauppa[b1i8li,t1y9o].fzthise tphreopdoissteadncseysbtetmw.eIennatdhdeitleionns, gthroeumpos,daunladtiuonis ttrhaensafnegr-lfeuonfctthioenaxcuiarlvreayof[2th0e]. dTehseigsnuebdsccroiplltismoafttohressyesvteamriaibs lsehsoinwdnictaotevethriefynuthme bdeersoirfalbelnes ogprtoiucapl,saynsdte“m0”pe(zrefororm) ianndciecainteisntshpeeoctbinjegctthpelagneen. ekr1a–lk3pihnodniceactaemtheerarsefbreaccatiunsge pthoewmeroodfutlha-e tlieonnstgrarnosufperthfuant cctoionnsti(tMutTeFs)tmheucsot lbliemeavtaolrusaytesdtetmo,caonmdmkeirscitahleizreeftrhaectoipntgicpaol wsyesrteomf tihnetohpeitnicdaulsstyrys.teSmectioobne4tpesrteesde.nts the conclusion of this study
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