Abstract: A first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4) are arranged in this order from an object side. The first lens (L1) has a biconvex shape and a positive refracting power. The second lens (L2) has a meniscus shape that is convex toward the object side, and has a negative refracting power. The third lens (L3) has a meniscus shape that is convex toward an image side, and has a positive refracting power. The fourth lens (L4) has a meniscus shape that is convex toward the object side, and has a negative refracting power. A chromatic aberration generated by the first lens (L1) is corrected by the second lens (L2). A chromatic aberration generated by the third lens (L3) is corrected by the fourth lens (L4).

Abstract: An imaging lens comprises a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4), which are arranged in ascending sequence, starting from the lens nearest to the object. The first lens (L1) has a double-convex shape and positive refractive power. The second lens (L2) has a double-concave shape and negative refractive power. The third lens (L3) has a meniscus shape with its convex surface facing an image plane, and has positive refractive power. The fourth lens (L4) has a meniscus shape with its convex surface facing the object. A chromatic aberration occurred in the first lens (L1) is corrected by the second lens (L2). A chromatic aberration occurred in the third lens (L3) is corrected by the fourth lens (L4).

Abstract: An imaging lens enables a large focal depth and low error sensitivity. The imaging lens satisfies “0.016<?/f<0.018,” where ? is the absolute value of longitudinal chromatic aberrations at F curve and C curve wavelengths, and f is the combined focal distance of the entire compound imaging lens. A first, a second, and a third lens are disposed sequentially, the first lens disposed toward an object, and the third lens disposed toward an image surface. The first lens has a positive refraction, a meniscus shape, and a convex surface facing the object. The second lens has a meniscus shape with a concave surface facing the object. The third lens has a convex-type shape facing the object; and a concave-type aspherical shape facing the image surface, providing a negative refraction in a radially central portion and a positive refraction in a radially peripheral portion.

Abstract: An imaging lens comprises a first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4), which are arranged in ascending sequence, starting from the lens nearest to the object. The first lens (L1) has a double-convex shape and positive refractive power. The second lens (L2) has a double-concave shape and negative refractive power. The third lens (L3) has a meniscus shape with its convex surface facing an image plane, and has positive refractive power. The fourth lens (L4) has a meniscus shape with its convex surface facing the object. A chromatic aberration occurred in the first lens (L1) is corrected by the second lens (L2). A chromatic aberration occurred in the third lens (L3) is corrected by the fourth lens (L4).

Abstract: A first lens (L1), a second lens (L2), a third lens (L3), and a fourth lens (L4) are arranged in this order from an object side. The first lens (L1) has a biconvex shape and a positive refracting power. The second lens (L2) has a meniscus shape that is convex toward the object side, and has a negative refracting power. The third lens (L3) has a meniscus shape that is convex toward an image side, and has a positive refracting power. The fourth lens (L4) has a meniscus shape that is convex toward the object side, and has a negative refracting power. A chromatic aberration generated by the first lens (L1) is corrected by the second lens (L2). A chromatic aberration generated by the third lens (L3) is corrected by the fourth lens (L4).

Abstract: An imaging lens has a compact shape and sufficiently compensates for various aberrations. The imaging lens includes a first lens, a second lens, and a third lens disposed sequentially, with the first lens toward an object. The conditions “0.5H<T0<0.7H,” “2<?r4/?<2.5,” and “0.15<?r5/?<0.3” are satisfied, where: H is the effective radius of the surface of the third lens facing an image surface; T0 is the distance between the optical axis and a point on a line parallel to the optical axis and normal to the surface of the third lens facing the image surface; ? is the combined refractive power of the imaging lens; ?r4 is the refractive power of the surface of the second lens facing the image surface; and ?r5 is the refractive power of the surface of the third lens facing the object.

Abstract: An imaging lens enables a large focal depth and low error sensitivity. The imaging lens satisfies “0.016<?/f<0.018,” where ? is the absolute value of longitudinal chromatic aberrations at F curve and C curve wavelengths, and f is the combined focal distance of the entire compound imaging lens. A first, a second, and a third lens are disposed sequentially, the first lens disposed toward an object, and the third lens disposed toward an image surface. The first lens has a positive refraction, a meniscus shape, and a convex surface facing the object. The second lens has a meniscus shape with a concave surface facing the object. The third lens has a convex-type shape facing the object; and a concave-type aspherical shape facing the image surface, providing a negative refraction in a radially central portion and a positive refraction in a radially peripheral portion.

Abstract: An imaging lens has a compact shape and sufficiently compensates for various aberrations. The imaging lens includes a first lens, a second lens, and a third lens disposed sequentially, with the first lens toward an object. The conditions “0.5H<T0<0.7H,” “2<?r4/?<2.5,” and “0.15<?r5/?<0.3” are satisfied, where: H is the effective radius of the surface of the third lens facing an image surface; T0 is the distance between the optical axis and a point on a line parallel to the optical axis and normal to the surface of the third lens facing the image surface; ? is the combined refractive power of the imaging lens; ?r4 is the refractive power of the surface of the second lens facing the image surface; and ?r5 is the refractive power of the surface of the third lens facing the object.

Abstract: To achieve light blocking performance firmly by a simple constitution with no need of separately providing a special member, a photographing element is provided on a front face side of a circuit board for a camera and a light blocking member is provided on a rear face side thereof. Connection terminal portions++ are arranged to align at a peripheral portion of the board. As the light blocking member on the rear face side, a conductive pattern or a resist having light blocking performance is used and the conductive pattern is integrally formed with one of the connection terminal portions and the resist is formed at portions excluding the connection terminal portions. The conductive pattern may be formed by copper paste and the resist may be formed by a resist of black color or the like.

Abstract: From an object, a first lens that is a meniscus lens having a convex surface that faces an object, a second lens that faces a concave surface of the first lens, a third lens having a concave surface that faces the second lens, and a fourth lens that is a positive lens having a convex back surface, (1) ?3<?4, (2) 0.5<Ymax/f<0.8, and (3) ?d<1.5 f are satisfied, where ?3 is an Abbe number of the third lens, ?4 is an Abbe number of the fourth lens, Ymax is a maximum height of an image, f is a composite focal length, ?d is a distance between a first surface of the first lens and a second surface of the fourth lens, the first surface facing the object and the second surface facing an imaging plane, any one surface of the first lens and the fourth lens having a non-spherical surface.

Abstract: From an object, a first lens that is a meniscus lens having a convex surface that faces an object, a second lens that faces a concave surface of the first lens, a third lens having a concave surface that faces the second lens, and a fourth lens that is a positive lens having a convex back surface, (1) ?3<?4, (2) 0.5<Ymax/f<0.8, and (3) ?d<1.5f are satisfied, where ?3 is an Abbe number of the third lens, ?4 is an Abbe number of the fourth lens, Ymax is a maximum height of an image, f is a composite focal length, ?d is a distance between a first surface of the first lens and a second surface of the fourth lens, the first surface facing the object and the second surface facing an imaging plane, any one surface of the first lens and the fourth lens having a non-spherical surface.

Abstract: To achieve light blocking performance firmly by a simple constitution with no need of separately providing a special member, a photographing element 2 is provided on a front face side of a circuit board 1 for a camera and a light blocking member is provided on a rear face side thereof. Connection terminal portions 11 are arranged to align at a peripheral portion of the board 1. As the light blocking member on the rear face side, a conductive pattern or a resist having light blocking performance is used and the conductive pattern is integrally formed with one of the connection terminal portions 11 and the resist is formed at portions excluding the connection terminal portions. The conductive pattern may be formed by copper paste and the resist may be formed by a resist of black color or the like.

Abstract: A photographing apparatus has a driving circuit and a photographing element driven by the driving circuit mounted to a circuit board, and an optical apparatus unit mounted to the circuit board at a position with respect to the photographing element to enable an image to be photographed by the photographing element. The optical apparatus unit comprises a holder for holding an optical member at an inner portion thereof, the holder having a male screw portion at an outer periphery thereof, and a main plate having a holder receiver provided with a female screw portion corresponding to the male screw portion of the holder. The main plate is mounted to the circuit board. The holder is molded of plastic and the male screw portion of the holder is provided with a first male screw portion having a first diameter and a second male screw portion having a second diameter smaller than the first diameter.