Kolen Co., Ltd.

Seong Hee Bae

Ji Eun Kim

Chi Ho Ahn

Chan Goo Kang

Jae Hoon Cho

Se Jin Kim

Kyoung Soo Song

Jong Jin Lee

A wide angle lens system, from an object side to an image plane side, includes: a first lens having a positive refractive power; a second lens having a positive refractive power and an exit surface that is convex toward the image plane side; a third lens having a negative refractive power and an exit surface that is concave toward the image plane side; a fourth lens having a positive refractive power and an exit surface that is convex toward the image plane side; a fifth lens having a negative refractive power and an exit surface that is concave toward the image plane side; and a sixth lens having a positive refractive power. The wide angle lens system satisfies the following formulas:75&#x3c;FOV&#x3c;852.0&#x3c;Fno&#x3c;2.3

Wide angle lens system and imaging device having the same

Provided are lens optical systems. A lens optical system includes first to third lenses sequentially arranged in a direction from an object to an image sensor. The first lens may have a positive refractive power and an entrance surface convex toward the object. The second lens may have a negative refractive power and a meniscus shape convex toward the image sensor. The third lens may have a positive refractive power, and at least one of entrance and exit surfaces of the third lens may have an inflection point in a direction from a center region toward an edge thereof. The outer diameter D3 (in millimeters) of the exit surface of the third lens and the diagonal length ImgHof a maximum pixel region of the image sensor may satisfy 2.6&#x3c;D3&#x3c;3.0 and 1.3&#x3c;ImgH/D3&#x3c;1.5. The system may have a field of view (FOV) of about 75&#xb0; to about 85&#xb0;.

Photographic lens optical system

A photographic lens optical system which includes five lenses sequentially arranged in a direction from an object to an image sensor is disclosed. A first lens may have a positive refractive power and an entrance surface convex toward the object. A second lens may have a negative refractive power and an exit surface concave toward the image sensor. A third lens may have a positive refractive power and a meniscus shape convex toward the image sensor. A fourth lens may have a negative refractive power and a meniscus shape convex toward the image sensor. A fifth lens may have a negative refractive power, and at least one of an entrance surface and an exit surface of the fifth lens may be aspheric. The system may satisfy the formula: | tan &#x3b8;|/f&#x3c;1.0, &#x3b8; denoting an angle of view of the system, and f denoting a focal length of the system.

A photographic lens optical system includes: a first lens having a positive refractive power and a meniscus shape convex toward an object side; a second lens having a negative refractive power and a meniscus shape convex toward the object side; a doublet lens having a positive refractive power and formed by combining a third lens and a fourth lens; a fifth lens having a positive refractive power and a double convex shape; and a sixth lens having a positive refractive power and a double convex shape. The first to sixth lenses are sequentially arranged in a direction from the object side to an image side, and the photographic lens optical system satisfies the following condition:1.5&#x3c;2&#x3c;1.7

A photographic lens optical system. The photographic lens optical system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens that are sequentially arranged in a direction from an object toward an image sensor. The first lens has a negative (&#x2212;) power, and the emission surface thereof may be convex toward the object. The second lens may have a positive (+) power, the third and fourth lenses have positive (+) powers, and the fifth lens has a negative (&#x2212;) power. Furthermore, the sixth lens is an aspherical lens having a positive (+) power.

An optical lens system includes sequentially from an object side to an image plane side: a first lens having a negative refractive power and an object side surface that is convex toward the object side; a second lens having a negative refractive power and an object side surface that is convex toward the object side; a third lens having a positive refractive power and an image side surface that is convex toward the image side; a fourth lens having a negative refractive power and an object side surface that is concave toward the object side; and a fifth lens having a positive refractive power and an image side surface that is convex toward the image side.

Optical lens system

An optical lens system includes sequentially from an object side to an image plane side: a first lens having a negative refractive power and an object side surface that is convex; a second lens having a positive refractive power and an image side surface that is convex toward the image side; a third lens having a positive refractive power and an image side surface that is convex toward the image side; a fourth lens having a positive refractive power and a biconvex shape; and a fifth lens having a negative refractive power and an object side surface that is concave toward the object side.

A photographic lens optical system includes: a first lens having a negative refractive power and a meniscus shape convex toward an object side; a second lens having a positive refractive power and a shape convex toward an image side; a third lens having a positive refractive power and a double convex shape; and a fourth lens having a negative refractive power and a shape convex toward the image side, wherein the first to fourth lenses are sequentially arranged in a direction from the object side to the image side, and the photographic lens optical system satisfies the following condition:0.15&#x3c;|(tan &#x3b8;)/|&#x3c;0.25

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Daejeon, South Korea

Seong Hee Bae