Abstract: A lens driving device suppresses inward deformation of posts when the winding of a conductive wire generates a winding pressure. A lens driving device 1 includes a holder 10 that holds a lens unit 13. The holder 10 is movable in an optical axis direction of the lens unit 13. A magnet 20 surrounds the lens unit 13 in a radial direction of the lens unit 13. The magnet 20 is fixed to the holder 10. A coil 60 surrounds the holder 10 in the radial direction. The coil 60 faces the magnet in the radial direction. Posts surround the holder in the radial direction. The posts to which the coil is wound extends in the optical axis direction. A beam connects ends of the posts facing the same direction in the optical axis direction with each other. The beam is connected to each end of the posts.

Abstract: A lens driving device accurately and smoothly moves a holder in an optical axis direction even when the distance between lower shaft end supporting portions differ from the distance between upper shaft end supporting holes. The cross-section, in a direction perpendicular to the optical axis direction, of at least one upper shaft end supporting hole 42 among the plurality of upper shaft end supporting holes 41 and 42 arranged in the cover is larger than the cross-section, in a direction perpendicular to the optical axis direction, of a corresponding sub-shaft 52 among the plurality of shafts.

Abstract: A lens unit includes a first lens having positive power, a second lens having positive power, an aperture stop, a third lens having negative power, and a fourth lens. The first lens, the second lens, the aperture stop, the third lens, and the fourth lens are arranged in order from an object side toward an image side.

Abstract: A lens driving device includes a holder which holds a lens and is movable in the direction of an optical axis of the lens and a plurality of magnets which is fixed to the holder so as to be separated from each other in a circumferential direction. Cut-out portions are provided on the holder and the magnets which are adjacent to each other in the circumferential direction are communicated with each other through the cut-out portions. When an adhesive is filled into the cut-out portions, the adhesive bonds the magnets which are adjacent to each other in the circumferential direction.

Abstract: In an imaging lens, one compound lens and two single lenses are arranged in a lens barrel. On the light output side of the lens barrel, a filter is arranged with a distance from lens barrel. With a further distance from the filter, an imaging element is arranged. In the compound lens, a resin lens is bonded to a base member lens, having an output surface center of the resin lens displaced by a prescribed amount relative to an output surface center of the base member lens, so that a transmission decentration amount attributed to the base member lens, not including the resin lens, and the single lenses is cancelled by a transmission decentration amount by the resin lens when taken as a whole lens system. Thus, the imaging lens capable of suppressing reduction in resolving power due to transmission decentration of the lenses is obtained.

Abstract: An imaging lens unit which achieves a lower profile without adversely affecting the optical performance. The imaging lens unit includes a first lens, an aperture stop, a second lens, and a third lens arranged sequentially along the optical axis from the object side to the image side. The first lens includes a first surface located on the object side and being convex toward the object side and a second surface located on the image side and being concave toward the image side near the optical axis and convex toward the image side as the rim of the first lens becomes closer.

Abstract: A lens unit includes a first lens having positive power, a second lens having positive power, an aperture stop, a third lens having negative power, and a fourth lens. The first lens, the second lens, the aperture stop, the third lens, and the fourth lens are arranged in order from an object side toward an image side.

Abstract: An imaging lens unit which achieves a lower profile without adversely affecting the optical performance. The imaging lens unit includes a first lens, an aperture stop, a second lens, and a third lens arranged sequentially along the optical axis from the object side to the image side. The first lens includes a first surface located on the object side and being convex toward the object side and a second surface located on the image side and being concave toward the image side near the optical axis and convex toward the image side as the rim of the first lens becomes closer.

Abstract: A composite lens that prevents insufficient hardening of an ultraviolet curable resin near the periphery of an optically effective portion. The composite lens includes a plastic lens and a resin layer. The plastic lens includes the optically effective portion and a flange surrounding the optically effective portion. The resin layer is formed from an ultraviolet curable resin and arranged in contact with the optically effective portion. The flange includes a diffusion portion which diffuses ultraviolet light irradiating the plastic lens toward the resin layer through the plastic lens.

Abstract: In an imaging lens, one compound lens and two single lenses are arranged in a lens barrel. On the light output side of the lens barrel, a filter is arranged with a distance from lens barrel. With a further distance from the filter, an imaging element is arranged. In the compound lens, a resin lens is bonded to a base member lens, having an output surface center of the resin lens displaced by a prescribed amount relative to an output surface center of the base member lens, so that a transmission decentration amount attributed to the base member lens, not including the resin lens, and the single lenses is cancelled by a transmission decentration amount by the resin lens when taken as a whole lens system. Thus, the imaging lens capable of suppressing reduction in resolving power due to transmission decentration of the lenses is obtained.