Abstract: Provided is a wide-angle lens, including a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, and a seventh lens, sequentially arranged from an object side. An object-to-image distance of the wide-angle lens is set to d, an entrance pupil diameter of the wide-angle lens is set to HEP, and d/HEP<29.000 is satisfied.

Abstract: Provided is a wide-angle lens, including a lens group and a diaphragm. Lenses in the lens group are sequentially arranged from an object side in a manner sandwiching the diaphragm. A maximum half field of view of the wide-angle lens as a whole is set to ?, 98°<?<120° is satisfied. An effective focal length and an entrance pupil diameter of the wide-angle lens as a whole are set to f and HEP respectively, f/HEP<2.3 is satisfied. The lens group includes a first lens that is located closest to the object side and that is a negative lens with a concave surface facing an image side. An effective radius and a radius of curvature of an image side lens surface of the first lens are set to sd12 and R12 respectively, 0.890<sd12/R12<0.970 is satisfied.

Abstract: A wide-angle lens is provided. The wide-angle lens includes, sequentially arranged from an object side, a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an imaging element. The first lens is a negative lens with a convex spherical surface facing the object side and a concave surface facing an image side. The second lens is a negative lens with a concave surface facing the image side. A combined effective focal length of the first lens and the second lens is set to f12 and a maximum image height is set to HOI, ?1.000<f12/HOI<?0.400 is satisfied.

Abstract: A lens unit may include a plurality of lenses and a holder to hold the lenses. The lenses may include a cemented lens including a first lens and a second lens disposed on an image side with respect to the first lens. The first lens and the second lens may be joined by adhesive. The first lens may include a first lens face located on a side of the second lens and a first flange face. The second lens may include a second lens face located on a side of the first lens and a second flange face. The adhesive may be provided across a first boundary portion between the first lens face and the first flange face and across a second boundary portion between the second lens face and the second flange face. The second boundary portion may include one of a recessed part and a protruded part.

Abstract: Provided is a lens unit capable of maintaining suitable image formation characteristics even with changes in temperature. The fourth lens outer peripheral face of a fourth lens is not in contact with the inner peripheral face of a second accommodation part. A fifth lens is made of glass, is press fitted and fixed to a resin-made lens holder to form an integrated fifth lens body, and is housed in a lens-barrel. A stepped part formed to engage with a stepped part in the fourth lens is provided in the lens holder outside the fifth lens on the object side of the fifth lens body. A fifth lens body outer peripheral face that is an outermost peripheral face of the fifth lens body comes in contact with the inner peripheral face of the second accommodation part.

Abstract: A lens unit may include a plurality of lenses; and a cylindrical holder. The plurality of lenses may include a cemented lens having a second lens element bonded to a first lens element with an adhesive layer interposed therebetween. The first lens element may be a plastic lens having a convex lens surface and a first flange unit at an outer peripheral side. The second lens element may be a plastic lens having a concave lens surface bonded by the adhesive layer onto the convex lens surface of the first lens element and a second flange unit at an outer peripheral side. One of the first and second lens elements may be in contact with the holder, and the may not be in contact with the holder. The first and second cemented lens elements may include an optical axial direction abutment surface and a radial direction abutment surface.

Abstract: An imaging lens system may include a first lens; a second lens; a third lens; a diaphragm; a fourth lens; a fifth lens; a sixth lens; and a seventh lens. The first lens may be a positive meniscus lens. The second lens may be a negative meniscus lens. The third lens may be a meniscus lens comprising. The fourth lens may be a positive lens. The fifth lens may be a positive lens. The sixth lens may be a negative lens comprising a sixth lens concave surface facing the image side. The seventh lens may be a positive lens comprising a seventh lens convex surface facing the object side. The fifth lens may be a glass lens. The second, third, fourth, sixth and seventh lenses may be plastic lenses. The sixth lens concave surface may be joined to the seventh lens convex surface with an adhesive.

Abstract: Provided is a wide-angle lens, including a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, and a seventh lens, sequentially arranged from an object side. An object-to-image distance of the wide-angle lens is set to d, an entrance pupil diameter of the wide-angle lens is set to HEP, and d/HEP<29.000 is satisfied.

Abstract: A wide-angle lens is provided. The wide-angle lens includes, sequentially arranged from an object side, a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an imaging element. The first lens is a negative lens with a convex spherical surface facing the object side and a concave surface facing an image side. The second lens is a negative lens with a concave surface facing the image side. A combined effective focal length of the first lens and the second lens is set to f12 and a maximum image height is set to HOI, ?1.000<f12/HOI<?0.400 is satisfied.

Abstract: Provided is a wide-angle lens, including a lens group and a diaphragm. Lenses in the lens group are sequentially arranged from an object side in a manner sandwiching the diaphragm. A maximum half field of view of the wide-angle lens as a whole is set to ?, 98°<?<120° is satisfied. An effective focal length and an entrance pupil diameter of the wide-angle lens as a whole are set to f and HEP respectively, f/HEP<2.3 is satisfied. The lens group includes a first lens that is located closest to the object side and that is a negative lens with a concave surface facing an image side. An effective radius and a radius of curvature of an image side lens surface of the first lens are set to sd12 and R12 respectively, 0.890<sd12/R12<0.970 is satisfied.

Abstract: A protrusion part which protrudes locally from the periphery of a fifth lens body toward an image side may be provided on an image side of the fifth lens body. On an object side of a cemented lens, a cemented lens upper surface abutting against the protrusion part on the outside of a lens surface may be provided. The protrusion part may be formed in number at equal intervals in the circumferential direction, and the protrusion parts may be divided into seven protrusion part groups each including three protrusion parts in accordance with the protrusion amount to the image side. The protrusion part which actually abuts against the cemented lens upper surface may be selected from among the protrusion parts in accordance with the thickness of a fifth lens as actually measured, so that the interval between the fifth lens and the cemented lens may be of an appropriate value.

Abstract: The wide-angle lens includes seven lenses and is provided with a diaphragm between the fourth lens and the fifth lens. The first lens is a negative meniscus lens whose convex surface faces the object side. The second lens is a negative meniscus lens whose at least one surface is an aspherical surface and whose concave surface faces an image side. The third lens is a negative meniscus lens whose at least one surface is an aspherical surface and whose concave surface faces the object side. The fourth lens and the fifth lens are positive lenses. The sixth lens is a negative lens whose concave surface faces the image side. The seventh lens is a double convex lens whose convex surfaces face both of the object side and the image side, and configures a joined lens with the sixth lens.

Abstract: A wide angle lens may include first through seventh lenses and an aperture between the fourth and fifth lenses. The first and second lenses may be negative meniscus lenses. The third and sixth lenses may be negative lenses. The fourth and fifth lenses may be positive lenses. The first lens may have a convex surface facing the object side. The second and sixth lenses may each have a concave surface facing the image side. The third lens may have a concave surface facing the object side. The fourth lens may have a convex surface facing the image side. The seventh lens may be a biconvex lens having convex surfaces facing the object and image sides. The third, fourth lens, sixth lens, and seventh lenses may be plastic lenses. The third and fourth lenses may constitute a first cemented lens. The sixth and seventh lenses may constitute a second cemented lens.

Abstract: A lens unit with multiple lenses includes at least a glass lens arranged in an optical axis direction and a lens barrel holding the lenses. The lens barrel includes a lens holder holding the glass lens. An object side face of the lens holder is formed with multiple projecting parts supporting an adjacent lens which is adjacent to the glass lens on the object side. The projecting parts is structured as a distance determination part adjusting and determining a space distance between the glass lens and the adjacent lens by using a heat press process. A crushing amount of the projecting parts is determined with a lens face of the glass lens as a reference. The space distance between the glass lens and the adjacent lens is adjusted to restrain focus deviation due to a thickness error of the glass lens occurred at the time of molding the glass lens.

Abstract: An imaging lens system may include a first lens; a second lens; a third lens; a diaphragm; a fourth lens; a fifth lens; a sixth lens; and a seventh lens. The first lens may be a positive meniscus lens. The second lens may be a negative meniscus lens. The third lens may be a meniscus lens comprising. The fourth lens may be a positive lens. The fifth lens may be a positive lens. The sixth lens may be a negative lens comprising a sixth lens concave surface facing the image side. The seventh lens may be a positive lens comprising a seventh lens convex surface facing the object side. The fifth lens may be a glass lens. The second, third, fourth, sixth and seventh lenses may be plastic lenses. The sixth lens concave surface may be joined to the seventh lens convex surface with an adhesive.

Abstract: A lens unit may include a plurality of lenses and a holder to hold the lenses. The lenses may include a cemented lens including a first lens and a second lens disposed on an image side with respect to the first lens. The first lens and the second lens may be joined by adhesive. The first lens may include a first lens face located on a side of the second lens and a first flange face. The second lens may include a second lens face located on a side of the first lens and a second flange face. The adhesive may be provided across a first boundary portion between the first lens face and the first flange face and across a second boundary portion between the second lens face and the second flange face. The second boundary portion may include one of a recessed part and a protruded part.

Abstract: A torsion spring that is used in a throttle valve device increasing and decreasing an opening degree of an intake passage or an exhaust passage of an internal-combustion engine includes: two coil springs connected with each other so that torsion directions are opposite from each other; and a hook disposed between the two coil springs. Of the two coil springs, one side spring arranged at one side in an axial direction biases a valve object to a closing side, and the other side spring arranged at the other side in the axial direction biases the valve object to an opening side. In at least one coil spring of the two coil springs, a dimension of a clearance between the at least one coil spring and the hook connected with each other is larger than an average value of clearances between coil turns of the at least one coil spring.

Abstract: A lens unit may include a plurality of lenses; and a cylindrical holder. The plurality of lenses may include a cemented lens having a second lens element bonded to a first lens element with an adhesive layer interposed therebetween. The first lens element may be a plastic lens having a convex lens surface and a first flange unit at an outer peripheral side. The second lens element may be a plastic lens having a concave lens surface bonded by the adhesive layer onto the convex lens surface of the first lens element and a second flange unit at an outer peripheral side. One of the first and second lens elements may be in contact with the holder, and the may not be in contact with the holder. The first and second cemented lens elements may include an optical axial direction abutment surface and a radial direction abutment surface.

Abstract: The wide-angle lens includes seven lenses and is provided with a diaphragm between the fourth lens and the fifth lens. The first lens is a negative meniscus lens whose convex surface faces the object side. The second lens is a negative meniscus lens whose at least one surface is an aspherical surface and whose concave surface faces an image side. The third lens is a negative meniscus lens whose at least one surface is an aspherical surface and whose concave surface faces the object side. The fourth lens and the fifth lens are positive lenses. The sixth lens is a negative lens whose concave surface faces the image side. The seventh lens is a double convex lens whose convex surfaces face both of the object side and the image side, and configures a joined lens with the sixth lens.

Abstract: A torsion spring that is used in a throttle valve device increasing and decreasing an opening degree of an intake passage or an exhaust passage of an internal-combustion engine includes: two coil springs connected with each other so that torsion directions are opposite from each other; and a hook disposed between the two coil springs. Of the two coil springs, one side spring arranged at one side in an axial direction biases a valve object to a closing side, and the other side spring arranged at the other side in the axial direction biases the valve object to an opening side. In at least one coil spring of the two coil springs, a dimension of a clearance between the at least one coil spring and the hook connected with each other is larger than an average value of clearances between coil turns of the at least one coil spring.