scholarly journals Optical Design of a Novel Collimator System with a Variable Virtual-Object Distance for an Inspection Instrument of Mobile Phone Camera Optics

2021 ◽  
Vol 11 (8) ◽  
pp. 3350
Author(s):  
Hojong Choi ◽  
Se-woon Choe ◽  
Jaemyung Ryu
Keyword(s):  
Mobile Phone ◽  
Near Field ◽  
Optical Design ◽  
Field Performance ◽  
Chromatic Aberration ◽  
Virtual Object ◽  
Object Distance ◽  
Field Curvature ◽  
Infinite Point ◽  
Mobile Phone Camera

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.

scholarly journals New Optical Design Method of Floating Type Collimator for Microscopic Camera Inspection

2021 ◽  
Vol 11 (13) ◽  
pp. 6203
Author(s):  
Seonkoo Chee ◽  
Jaemyung Ryu ◽  
Hojong Choi
Keyword(s):  
Mobile Phone ◽  
Design Method ◽  
Optical Design ◽  
Target Position ◽  
Target Size ◽  
Virtual Object ◽  
Wide Field ◽  
Object Distance ◽  
Floating Type ◽  
Mobile Phone Camera

Recently released mobile phone cameras are capable of photographing objects at a fairly close distance. In addition, the field angle from the camera has increased. To measure the resolution of a mobile phone camera, the target must be photographed. To measure the resolution according to the object distance change from a mobile phone camera with a wide field angle, the target size must be large, whereas the target position must be moved. However, the target size cannot be changed. A virtual object for the target was created using a collimator. Moving a part of the lens group constituting the collimator also changes the virtual object distance. If the amount of change in the virtual object distance is large, the resolution of the collimator may also change. Therefore, a collimator that maintains the resolution even when the distance of the virtual object changes is designed as a floating type in which two lens groups move. Therefore, we propose a new floating collimator optical system that can inspect the resolution of mobile phone cameras from infinity to a close range to compensate for aberrations caused by object distance changes.

Optical Design of a 1300 Megapixel Mobile Phone Camera Lens Optics Designs

2014 ◽  
Vol 51 (1) ◽  
pp. 012202
Author(s):  
尹志东 Yin Zhidong ◽  
向阳 Xiang Yang ◽  
高健 Gao Jian ◽  
孔达 Kong Da
Keyword(s):  
Mobile Phone ◽  
Optical Design ◽  
Camera Lens ◽  
Lens Optics ◽  
Mobile Phone Camera

Optical Design for Three Mega Pixel Mobile Phone Camera

2007 ◽  
pp. 71-74
Author(s):  
Ga-Lane Chen ◽  
Chun-Yu Lee ◽  
Adams Yuan ◽  
Patrick Chang
Keyword(s):  
Mobile Phone ◽  
Optical Design ◽  
Mobile Phone Camera

The Absurd Injunction to Not Belong and the Bidūn in Kuwait

2020 ◽  
Vol 52 (4) ◽  
pp. 726-732
Author(s):  
Claire Beaugrand
Keyword(s):  
Mobile Phone ◽  
Legal Status ◽  
Personal Data ◽  
Male Voice ◽  
Central System ◽  
Additional Remark ◽  
Special Mention ◽  
The Voice ◽  
Mobile Phone Camera

In a tweet posted on 29 March 2018, a bidūn activist—who was later jailed from July 2019 to January 2020 for peacefully protesting against the inhumane conditions under which the bidūn are living—shared a video. The brief video zooms in closely on an ID card, recognizable as one of those issued to the bidūn, or long-term residents of Kuwait who are in contention with the state regarding their legal status. More precisely, the mobile phone camera focuses on the back of the ID card, on one line with a special mention added by the Central System (al-jihāz al-markazī), the administration in charge of bidūn affairs. Other magnetic strip cards hide the personal data written above and below it. A male voice can be heard saying that he will read this additional remark, but before even doing so he bursts into laughter. The faceless voice goes on to read out the label in an unrestrained laugh: “ladayh qarīb … ladayh qarīna … dālla ʿalā al-jinsiyya al-ʿIrāqiyya” (he has a relative … who has presumptive evidence … suggesting an Iraqi nationality). The video shakes as the result of a contagious laugh that grows in intensity. In the Kuwaiti dialect, the voice continues commenting: “Uqsim bil-Allāh, gaʿadt sāʿa ufakkir shinū maʿanāt hal-ḥatchī” (I swear by God, it took me an hour to figure out the meaning of this nonsense), before reading the sentence again, stopping and guffawing, and asking if he should “repeat it a third time,” expressing amazement at its absurdity. The tweet, addressed to the head of the Central System (mentioned in the hashtag #faḍīḥat Sāliḥ al-Faḍāla, or #scandal Salih al-Fadala), reads: In lam tastaḥī fa-'ktub mā shaʾt (Don't bother, write what you want).

scholarly journals Thresholding Scheme Based on Boundary Pixels of Stripes for Visible Light Communication With Mobile-Phone Camera

IEEE Access ◽  
2018 ◽  
Vol 6 ◽  
pp. 53053-53061 ◽  
Author(s):  
Zhenshan Zhang ◽  
Tiantian Zhang ◽  
Ji Zhou ◽  
Yueming Lu ◽  
Yaojun Qiao
Keyword(s):  
Visible Light ◽  
Mobile Phone ◽  
Visible Light Communication ◽  
Mobile Phone Camera

Influence of the 400mm-aperture Nd:glass slab-amplifier gain nonuniformity on 1ω(1053nm) near-field performance

2013 ◽  
Author(s):  
Wen-yi Wang ◽  
Yuan-Chao Geng ◽  
Lin Chen ◽  
Yi-ming Luo ◽  
Yuan-bin Chen ◽  
...  
Keyword(s):  
Near Field ◽  
Field Performance ◽  
Amplifier Gain

scholarly journals Optical Design for a Head-Mounted Display

1993 ◽  
Vol 2 (3) ◽  
pp. 185-202 ◽  
Author(s):  
Jiantao Ma ◽  
John M. Hollerbach ◽  
Ian W. Hunter
Keyword(s):  
Optical Design ◽  
Field Of View ◽  
Wide Field ◽  
Optical System Design ◽  
Head Mounted Display ◽  
Cost Constraints ◽  
Field Curvature ◽  
Folded Structure ◽  
Wide Field Of View ◽  
Color Field

This paper presents a design concept for a head-mounted display, incorporating color stereo vision using commercial LCDs and our own optical relay design. The focus here is on the optical system design, which must meet specifications for a wide field of view, size and cost constraints, and aberration minimization based on human factors. Two multispherical lens systems are presented and compared, one a straight structure and the other a folded structure, which satisfy the design constraints. Their aberrations (distortion, coma, lateral color, field curvature, and astigmatism) have been well corrected, according to human perceptual constraints explicitly discussed. Each has a 20-mm eye relief and an instantaneous field of view greater than 60°; the former has an exit pupil of 10 mm and the latter of 8 mm.

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