Patent
Imaging lens and imaging apparatus
TLDR
In this article, the distance on an optical axis from a most-object-side lens surface in an entire system to an image-plane, maximum image height, distance on the optical-axis from an imaging lens surface to a mostimage-side surface in the first lens-group, and focal length of the entire system are satisfied.Abstract:
An imaging lens substantially consists of a first lens-group, a stop and a second lens-group in this order from an object-side. The first lens-group substantially consists of three or less lenses including at least one negative lens and a positive lens. The second lens-group substantially consists of a 21st lens-group and a 22nd lens-group in this order from the object-side. The 21st lens-group substantially consists of three or less lenses and has positive refractive-power. The 22nd lens-group substantially consists of two lenses of a negative lens and a positive lens in this order from the object-side. Predetermined conditional formulas about distance on an optical-axis from a most-object-side lens surface in an entire system to an image-plane, maximum image height, distance on the optical-axis from a most-object-side lens surface in the first lens-group to a most-image-side lens surface in the second lens-group, and focal-length of the entire system are satisfied.read more
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Patent
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TL;DR: In this paper, the authors proposed a method to enable a reduction in size, reduction in costs, widening of the angle of view and an increase in performance of an imaging lens, and also to eliminate restrictions on the imaging element used.
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Optical image capturing system
Nai Yuan Tang,Yeong Ming Chang +1 more
TL;DR: In this article, a six-piece optical lens for capturing image and a six piece optical module for capturing images is presented. But the optical module is not aspheric. And the optical lens can increase aperture value and improve the imagining quality for use in compact cameras.
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Imaging lens, imaging device and portable terminal
Eigo Sano,Yuichi Ozaki +1 more
TL;DR: In this article, a small-sized five-element image pickup lens with a sufficient lens speed of about F2 and exhibits various aberrations being excellently corrected is presented.
References
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Patent
zoom lens system
Takayuki Ito,Nobutaka Minefuji +1 more
TL;DR: In this paper, the zoom lens system of the present invention satisfies the following conditions: 1.5 1 wherein f2G: the focal length of the positive second lens group; mW: the lateral magnification of the Positive Second Lens Group at the short focal length extremity; and mT: the diameter of the entire zoom lens systems at the long focal lengths extremity.
Patent
Zoom lens system, imaging device and camera
Keiki Yoshitsugu,Takakazu Bito +1 more
TL;DR: In this paper, a zoom lens system consisting of a first unit having negative power, a second unit having positive power, and a third unit having a positive power was presented, where the first unit has negative power and the second unit has positive power.
Patent
Zoom lens system, interchangeable lens apparatus and camera system
Uchida Tsuneo,Nobuyuki Adachi +1 more
TL;DR: In this paper, a zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing unit.
Patent
Optical lens system for taking image
TL;DR: An optical lens system for taking image comprises, in order from the object side to the image side: a first lens element with positive refractive power having a convex object-side surface; an aperture stop; a second lens elements with negative refractive powers; a third lens element having a concave object side surface; and an image side surface of the fourth lens element being aspheric and formed with inflection points.
Patent
Image pickup lens unit and image pickup device
TL;DR: In this paper, a small image pickup lens unit is manufactured for an image pickup device in mass-production and in a low cost by using an optical filter between lenses 1, 2, and 4 having a power.