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AssigneeKonica Corporation
InventorsSusumu Yamaguchi, Masae Sato, Takumi Matsui
Estimating the term…
A miniature image capturing lens includes an aperture diaphragm; and a lens system consisting of a first lens having a positive refracting power in which a convex surface of the first lens is directed toward an image; and a meniscus-shaped second lens in which a concave surface of the meniscus is directed toward an object. The aperture diaphragm, the first lens and the second lens are aligned in this order from the object side, the fist and second lenses have at least one aspherical surface. The following conditional formulas are satisfied: 0.50<f1/f<0.80 0.30<(R2+R1)/(R1−R2)<1.20 where f1 is a focal length of the first lens, f is a focal length of the entire image capturing lens, R1 is a radius of curvature of the object side surface of the first lens, and R2 is a radius of curvature of the image side surface of the second lens.
A miniature image capturing lens to capture an image of an object, comprising:
Dependencies are inferred from the claim text.
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Having at least one aspherical surface: having two lenses
Having two components only: one + and one - component
Optical objectives specially designed for the purposes specified below: telephoto objectives, i.e. systems of the type + - in which the distance…
Optical objectives specially designed for the purposes specified below: with lenses having one or more non-spherical faces, e.g. for reducing…
Term end not estimated
The present invention relates to a miniature image-capturing lens which is suitable for an imaging device employing a solid-state image-capturing element such as a CCD type image sensor, a CMOS type image sensor and the like.
In recent years, due to the higher performance demands and miniaturization of imaging devices employing solid-state image-capturing elements such as a CCD (a charged coupled device) type image sensor, a CMOS (a complementary metal oxide semiconductor) type image sensor and the like, mobile phones or personal computers employing such imaging devices have become popular. Further, continual miniaturization of image-capturing lenses loaded on the imaging devices is further demanded.
A two-piece structured lens, which makes it possible to develop higher performance compared to a single lens, is suitable for the image-capturing lens for the above-mentioned usage. Well known is a retro-focus type image-capturing lens, composed of a first lens having a negative refractive power, a diaphragm, and a second lens having a positive refractive power, which are arranged in the order from the object side. The image-capturing lens composed as mentioned above is disclosed in TOKKAI 2000-321489 and TOKKAI 2001-183578.
FIG. 1 is a cross section of a miniature image-capturing lens of Examples 1 to 6 of the present invention.
FIG. 2 shows aberrations of a miniature image-capturing lens of Example 1.
FIG. 3 shows aberrations of a miniature image-capturing lens of Example 2.
The examples of the miniature image-capturing lens of the present invention will be described referring to the drawings below, but the invention is not limited to this. Following are symbols used in each embodiment.
f: focal length of total image-capturing lens system
fB: back-focus