Milestone Co., Ltd.

Satoshi Dou

Toshiyuki Yoshida

An image pickup lens unit includes, as viewed from an object side, a retainer having an aperture stop, an image pickup lens, and a holder. The retainer having an aperture stop and the image pickup lens are united with each other. The holder assumes a substantially cylindrical shape and accommodates the image pickup lens such that the image pickup lens is united with the holder in a manner movable in relation to the holder, whereby movement of the retainer having an aperture stop causes the image pickup lens to move in relation to the holder to thereby carry out focus adjustment.

Image pickup lens unit

An image pickup lens system includes a first lens, a stop, and a second lens arranged in a row from an object side to an image side. The first lens is a meniscus resin lens having negative power and oriented such that a convex surface thereof faces the object side. The second lens is a meniscus resin lens having positive power and oriented such that a convex surface thereof faces the image side. The image pickup lens system has at least two aspheric lens surfaces such that the first lens has at least one aspheric surface and such that the second lens has at least one aspheric surface, and is configured so as to satisfy conditions represented by: 3.2f&lE;&verbar;r &verbar;&lE;50f; 0.9f&lE;d&lE;1.5f; and 0.1<&verbar;f &verbar;/&verbar;f &verbar;<0.9; where f is focal length of the image pickup lens system; f is focal length of the first lens; f is focal length of the second lens; d is distance between the convex surface of the first lens and the convex surface of the second lens (overall length of the image pickup lens system); and r is radius of curvature of a concave surface of the second lens facing the object side.

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Tsurugashima, Japan

Satoshi Dou