Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises: a positive lens unit that is arranged on an object side relative to the aperture diaphragm; a negative lens unit that is arranged on an image side relative to the positive lens unit and on an object side relative to the aperture diaphragm; and a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm. The zoom lens system satisfies the condition (4): 1.20<?NT/?NW<4.50 (here, fT/fW>3.

Abstract: A wide angle lens (100) has a first lens (1), a second lens (2), and a third lens (3) which are arranged in order from an object side, and an aperture (4). The first lens (1) is a spherical meniscus lens which has negative power and whose convex surface faces an object; the second lens (2) is an aspherical meniscus lens which has negative power along an optical axis and has positive power off the optical axis and whose convex surface faces the object side; and the third lens (3) is a lens which has positive power. The Abbe number of the second lens (2) is 30 or less; the ratio between the diagonal length D of an imaging device placed on an image plane of the lens system and the focal length f of the whole of the lens system, f/D, is 0.26 or less; and the ratio between the focal length f3 of the third lens (3) and the focal length f of the whole of the lens system, f3/f, is less than 1.5.

Abstract: A wide-angle lens (1) comprises: a first lens (2) placed on an object side; and a lens group (3) arranged closer to an image plane than the first lens (2). The first lens (2) is a resin-made meniscus lens: which has a convex surface on the object side; which has negative power; at least one surface of which is aspherical; whose refractive index at d line is equal to or greater than 1.58; whose Abbe number is equal to or less than 35; and on the convex surface on the object side of which is formed a hard coat layer (4). The lens group (3) comprises a plurality of lenses (a second lens (5), a third lens (6), and a fourth lens (8)) which have positive power in total. This provides a wide-angle lens that has a wide angle of view, is inexpensive, and is scratch proof.

Abstract: A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, and at least one subsequent lens unit having optical power, wherein in zooming from a wide-angle limit to a telephoto limit, the lens units are moved along an optical axis such that an air space between at least any two lens units among the lens units should vary, so that variable magnification is achieved, wherein the first lens unit includes a lens element having a reflecting surface for bending a light beam incident from the object, and wherein the condition is satisfied: 0.20<|fG1|/fT<0.52 (fT/fW?4.0, fG1 is a composite focal length of the first lens unit, and each of fT and fW is a focal length of the entire system at a telephoto limit or a wide-angle limit), an imaging device and a camera are provided.

Abstract: It is an object of the present invention to provide an imaging device that, even if the optical axis of the multifocal lens has a deviation resulting from its decentered surfaces, can prevent an image from being deteriorated by the low precision lens. The imaging device comprises a solid state image sensor for taking an image of an object to produce an image signal indicative of the image, an aspherical single focus lens, a bifocal lens disposed in front of the solid state image sensor, the bifocal lens having two focal distances, and an aperture diaphragm located just before the bifocal lens.

Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit and further that can compensate an image blur caused by vibration applied to the entire system. The zoom lens system according to the present invention comprises a plurality of lens units and an aperture diaphragm arranged in the lens unit.

Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system, in order from an object side to an image side, comprises at least: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having negative optical power; and an aperture diaphragm. At the time of zooming, the zoom lens system moves the first to third lens units so that intervals between these lens units vary. At the time of focusing from an infinity in-focus condition to a close-point object in-focus condition, the zoom lens system moves the third lens unit to the object side.

Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises a plurality of lens units and an aperture diaphragm arranged in the lens unit. The plurality of lens units include: a negative lens unit that is arranged on an object side relative to the aperture diaphragm and provided with negative optical power having an absolute value greatest in the entire system and that moves in a direction along an optical axis at the time of zooming; and a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm and that moves in a direction along the optical axis at the time of focusing such that an interval relative to the negative lens unit should vary.

Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention, in order from an object side to an image side, comprises: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having positive optical power; and an aperture diaphragm. At the time of zooming, the zoom lens system moves the first to third lens units so that intervals between these lens units vary. At the time of focusing from an infinity in-focus condition to a close-point object in-focus condition, the zoom lens system moves the third lens unit to the object side.

Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises a plurality of lens units and an aperture diaphragm arranged in the lens unit. The plurality of lens units include a focusing lens unit that is arranged on an object side relative to the aperture diaphragm and that moves in a direction along the optical axis at the time of focusing. Further, the zoom lens system satisfies at least one of the following conditions: (1) 1.2<|fF/fW|<6.0; and (2) 0.10<|fF/fT|<1.8 (here, fT/fW>3.0, fF: a focal length of the focusing lens unit, fT: a focal length of the entire system at a telephoto limit, fW: focal length of the entire system at a wide-angle limit).

Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention comprises: a positive lens unit that is arranged on an object side relative to the aperture diaphragm; a negative lens unit that is arranged on an image side relative to the positive lens unit and on an object side relative to the aperture diaphragm; and a focusing lens unit that is arranged in an optical path between the negative lens unit and the aperture diaphragm. The zoom lens system satisfies the condition (4): 1.20<?NT/?NW<4.50 (here, fT/fW>3.

Abstract: It is an object of the present invention to provide an imaging device that, even if the optical axis of the multifocal lens has a deviation resulting from its decentered surfaces, can prevent an image from being deteriorated by the low precision lens. The imaging device 1 comprises a solid state image sensor 6 for taking an image of an object to produce an image signal indicative of the image, an aspherical single focus lens 2, a bifocal lens 3 disposed in front of the solid state image sensor 6, the bifocal lens 3 having two focal distances, and an aperture diaphragm 4 located just before the bifocal lens 3.

Abstract: The present invention provides an imaging apparatus, comprising a multifocal lens (210) having a plurality of lens portions different from one another in focal length; an imaging device (29) for converting an image formed thereon by said multifocal lens (210) into an electric signal to be outputted therethrough as an image signal; a computing unit (33) for carrying out a weighted computing process on said image signal from said imaging device (29) in accordance with a predetermined compensation function to output a compensated image signal as an output image signal, and in which said compensation function is an inverse function obtained based on a point spread function with respect to an object disposed at a predetermined distance from an optical system constituted by said multifocal lens (210).

Abstract: The present invention aims to expand a range through which a guiding visible light for guiding a position of an eye appears in shooting an image of the eye and to put easily the position of the eye onto an optical axis of an imaging optical system in shooting. In the present invention, an eye image pick-up system (10) includes a lens (13), a lens-barrel (12) for supporting the lens (13), a mirror (14) as a guiding mirror for turning an optical path of an imaging optical system at an almost right angle and guiding a guiding visible light, an imaging device (16) for picking up an image of an eye (11), and an LED (15) provide at the back of the mirror (14) on a prolonged line of an optical axis (17) extending from the lens (13) to the mirror (14) to emit the guiding visible light. The mirror (14) has a reflecting film (18) formed by depositing reflecting material onto a transparent substrate, and a circular-ring light guiding portion (19) made of transparent material.

Abstract: An object of the invention is to precisely guide the position of an eye in order to acquire an excellent eye image which is suitable for an authentication. The invention provides an eye image pick-up apparatus including an image pick-up unit for picking up an image of an object, a mirror (40) provided on a front face of the image pick-up unit perpendicularly to an optical axis of the image pick-up unit and serving to reflect a reflected image of the object, an opening section (42) provided in a portion of the mirror (40) which intersects the optical axis and serving to align a position of an eye in the reflected image of the object reflected in the mirror (40), visible light source sections (46) and (47) provided on both left and right ends at a back side of the mirror (40), and shielding plates (43) and (44) provided on both left and right ends at a front side of the mirror (40) and serving to shield a light emitted from the left and right corresponding visible light source sections (46) and (47).

Abstract: The present invention aims to expand a range through which a guiding visible light for guiding a position of an eye appears in shooting an image of the eye and to put easily the position of the eye onto an optical axis of an imaging optical system in shooting. In the present invention, an eye image pick-up system (10) includes a lens (13), a lens-barrel (12) for supporting the lens (13), a mirror (14) as a guiding mirror for turning an optical path of an imaging optical system at an almost right angle and guiding a guiding visible light, an imaging device (16) for picking up an image of an eye (11), and an LED (15) provide at the back of the mirror (14) on a prolonged line of an optical axis (17) extending from the lens (13) to the mirror (14) to emit the guiding visible light. The mirror (14) has a reflecting film (18) formed by depositing reflecting material onto a transparent substrate, and a circular-ring light guiding portion (19) made of transparent material.

Abstract: To provide a lens select device in which an iris image pickup function may be incorporated into a portable information terminal at low cost. In a lens support member 34, a small gear 51 is formed at one end part of the lens support member, and a lens-housing boss part 53 and a lens-housing boss part 54 are juxtaposed at the other end part. By turning the small gear 51, the first lens or the second lens is aligned with a predetermined position. An operation part 59 is provided. When the operation part 59 engages with the small gear 51 and turns the same, the operation part 59 switches the lens which is aligned with the predetermined position to the first lens or the second lens. Preferably, the operation part 59 is an arcuate member which turns about a position, which is different from a rotational center of the small gear 51, and it is an inscribed gear 59 having teeth formed in the inner peripheral surface, which are in mesh with the small gear 51.

Abstract: An object of the invention is to precisely guide the position of an eye in order to acquire an excellent eye image which is suitable for an authentication.

Abstract: To provide a lens select device in which an iris image pickup function may be incorporated into a portable information terminal at low cost.

Abstract: In a mobile terminal device equipped with an eye imaging device which can properly shoot an eye image without failure for personal authentication, an eye image shooting section (16) for personal authentication is arranged in close proximity of the upper section (distal side) of the liquid crystal display (13) on the front of a main unit casing (11) of the cellular phone. An image pickup lens of the eye image shooting section (16) includes a reflecting telephoto lens. An illumination section (17) is arranged above an operation button section (12) in close proximity of the lower section (proximal side) of the liquid crystal display (13). On the front surface of the cellular phone, the eye image shooting section (16), the liquid crystal display (13), the illumination section (17) and the operation button section (12) are provided in this order from top to bottom.