Konica Minolta Opto, Inc.

Minolta Company, Ltd.

Masashi Isono

Tetsuo Kohno

Hitoshi Hagimori

Hiroaki Tanaka

Masatoshi Hirose

Kazuhiko Ishimaru

Hiromu Mukai

Kenji Konno

Eigo Sano

Keiji Matsusaka

Susumu Yamaguchi

Keiko Yamada

Takumi Matsui

Taizo Wakimura

Tomoo Doi

Provided is a single-focus optical system which is configured, in order from the object side to the image side, of a first to third lens groups and in which the first lens group and the third lens group are fixed with respect to a predetermined imaging surface, and the second lens group is moved in the optical axis direction to focus, wherein the first lens group comprises at least one positive lens and at least one negative lens, the second lens group comprises at least one positive lens, the third lens group comprises at least one lens having at least one aspheric surface and having a positive optical power at a peripheral portion thereof and 5&#x3c;|&#x394;v1|&#x3c;70 is satisfied where &#x394;v1 is a maximum value of the Abbe number difference between the positive lens and the negative lens in the first lens group.

Single-focus optical system, image pickup device, and digital apparatus

There are provided an imaging lens, which is capable of promoting high definition and miniaturization of a small-size image pickup apparatus, and the small-size image pickup apparatus using the same. A aperture diaphragm S is arranged between a first lens Land a second lens Lso that the first lens Lis configured to be displaced into the orthogonal direction to the optical axis. Even when an error sensitivity of a lens is large, a stable high resolution can be secured by performing a lens alignment by displacing the first lens Linto the orthogonal direction to the optical axis at the time of assembling, and thereby a high definition image can be obtained.

Imaging lens and small-size image pickup apparatus using the same

An image pickup lens includes, in order from an object side thereof: a first lens; a second lens comprising a surface facing the image surface side of the image pickup lens which is an aspheric surface; and a third lens. The aspheric surface has a concave shape facing the image surface side at a paraxial portion and has a convex shape facing the image surface side at the periphery.

Image pickup lens and image pickup apparatus

An imaging optical system, which is designed in a small size with low manufacturing costs, aberrations such as chromatic aberration of the imaging optical system being appropriately corrected, is provided. The imaging optical system comprises a first lens having positive power, a second lens having positive power and a third lens having negative power with an aspherical surface in the image side, the aspherical surface being shaped in a concave shape facing toward an image side in a vicinity of the optical axis and shaped in a convex shape facing toward the image side in a surrounding of the optical axis. The imaging optical system is designed to satisfy a formula, &#x3bd;3&#x2212;&#x3bd;2&#x3e;10, where &#x3bd;3 denotes an Abbe number of the third lens and &#x3bd;2 denotes an Abbe number of the second lens.

Imaging optical system

An image pick-up lens for forming an image of an object on a solid image pick-up element having a rectangular effective pixel area, has a first lens; a second lens; a third lens; and a diaphragm having an aperture. The following conditional expressions are satisfied:15&#xb0;&#x3c;IA&#x3c;35&#xb0;|&#x2212;()|&#x3c;5&#xb0;where,

Image pick-up lens, image pick-up unit and mobile terminal

An aperture stop, a first lens having a positive power, a second lens having a negative power, a third lens having a positive power, and a fourth lens whose concave face is directed toward the image surface side and having a meniscus shape are disposed in order from the object side. The second and third lenses are cemented to each other. Further, focal length 'f' of the entire system and total focal length 'f' of the second and third lenses satisfy the following conditional expression.|23|&#x3c;0.4

Image-taking lens system and digital apparatus using the same

An image pickup optical system comprising three lenses for forming an image on a solid imaging element, wherein the comprised lenses are, from an object side, a positive first lens (FL) whose convex surface is directed toward the object side, an aperture stop (ST), a negative second lens (FL) and a negative third lens (FL), and the following conditional expression is fulfilled,&#x2212;0.23&#x3c;2&#x3c;&#x2212;0.02

Image pickup optical system and digital apparatus using the same

There is provided an image-taking optical system to form an image in a solid-state image pickup element. The image-taking optical system comprises an aperture stop, a positive first lens having a convex surface on an object side, a positive second lens having a convex surface on an image side, and a negative third lens Lhaving a concave surface on the image side provided in this order from the object side. In addition, a conditional expression: 0.71&#x3c;f/f&#x3c;1.1 (f: focal length of the first lens, and f: focal length of the second lens) is satisfied.

Image-taking optical system

An image pickup lens system has a four-lens configuration which forms an image on a solid-state image pickup device. The image pickup lens system includes, from an object side, a positive first lens, an aperture stop, a positive second lens, a negative third lens whose concave surface is faced toward an image surface side, and a positive fourth lens in the order from an object side. A ratio of an axial lens thickness of the third lens to a focal length of the whole system is optimally set. Therefore, an exit pupil position can be kept far away from the image surface while the image pickup lens system has good optical performance and a compact size.

Image pickup lens system

An image taking lens forming an optical image on an solid-state image pickup element according to the present invention, is provided with, in order from an object side thereof: a first lens with a positive power; a second lens with a negative power; and a third lens with a negative power. Third lens includes an image side surface in an aspheric shape such that a region around an optical axis in the aspheric shape is formed in a concave shape facing an image side of the image taking lens and a peripheral region in the aspheric shape surrounding the region around the optical axis is formed in a convex shape facing the image side of the image taking lens. The image taking lens fulfills a predefined conditional formula.

Image taking lens

A taking lens system for forming an image on a solid-state image sensor has, from the object side thereof: an aperture stop, a first lens element having a positive optical power and convex to the object side, a second lens element having a positive optical power and convex to the image-surface side, and a third lens element having a negative optical power and concave to the image-surface side. Alternatively, a taking lens system for forming an image on a solid-state image sensor has an aperture stop, a first lens element having a positive optical power, having a meniscus shape, and convex to the object side, a second lens element having a positive optical power, and a third lens element having a negative optical power. In addition, in either case, the taking lens system fulfills prescribed conditional formulae.

Taking lens system

A wide-angle lens system has, from the object side thereof: a first lens element having a negative optical power and having a meniscus shape convex to the object side; a second lens element having a biconcave shape; a third lens element having a biconvex shape; and a fourth lens element having a negative optical power and having a meniscus shape convex to the image side. Alternatively, a wide-angle lens system has, from the object side thereof: a first lens element having a negative optical power; a second lens element having a negative optical power; a third lens element having a positive optical power; and a fourth lens element having a positive optical power.

Wide-angle lens system and image-taking device

A taking lens system for forming an image on a solid-state image sensor has, from the object side, two positive lens elements and at least one negative lens element. The most image-side lens surface is an aspherical surface concave to the image side, and this aspherical surface has a point of inflection.

A wide-angle lens system includes: from the object side, (1) a first lens element formed of glass having both surfaces thereof so formed as to be spherical, having a meniscus shape convex to the object side, and having a negative optical power; (2) a second lens element formed of plastic having a meniscus shape convex to the image side and having a positive optical power; (3) an aperture stop; and (4) a third lens element formed of plastic having a meniscus shape convex to the image side and having a positive optical power, and the wide-angle lens system includes three lens elements in total. This permits providing a low-cost, compact super-wide-angle lens system having a favorable optical performance.

Wide-angle lens system

A taking lens system has two lens elements, namely, from the object side, a positive lens element and a meniscus lens element convex to the image side, wherein the focal length of the entire taking lens system and the axial thickness from the object-side surface of the positive lens element to the image-side surface of the meniscus lens element fulfill a prescribed relation. Alternatively, a taking lens system has two lens elements, namely, from the object side, a first lens element having a meniscus shape with a convex surface on the object side and having a positive optical power and a second lens element having a meniscus shape with a concave surface on the image side, wherein the focal lengths of the first and second lens elements fulfill a prescribed relation. Alternatively, a taking lens system has three lens elements, namely, from the object side, a first lens element having a weak optical power, an aperture stop, a second lens element having a positive optical power, and a third lens element having a concave surface on the image side and having a negative optical power, wherein the focal length of the entire taking lens system and the focal lengths of the first and third lens elements fulfill prescribed relations.

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Hoi-gun, Japan

Masashi Isono