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 lenses and a holder in a tube shape which holds the lenses on an inner side such that in the lenses, a side face of a first lens located on a most object side may include a first side face part which is extended from an outer edge of a first face that is an object side face of the first lens toward an image side, a second side face part which is extended from an object side toward the image side on the image side with respect to the first side face part and an outer side in a radial direction with respect to the first side face part; and a third side face part which connects an image side end part of the first side face part with an object side end part of the second side face 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 includes a first lens disposed on an object side in an optical axis direction, a plurality of image-side lenses (second lens through seventh lens) comprising a second lens facing the first lens on an image side in the optical axis direction and disposed on the image side with respect to the first lens, a lens barrel coaxial with the optical axis to hold the first lens and the plurality of image-side lenses radially inside, a first sealing member to seal a gap between the first lens and the lens barrel, and a second sealing member to seal a gap between an image side surface (flange surface) of the first lens and the lens barrel radially inside the first sealing member.

Abstract: A lens unit 1 includes a plurality of lenses aligned in a row along an optical axis L and a lens holder 2. A first lens L1 located the closest to an object-side La includes an object-side lens surface 11, an image-side lens surface 12, and an image-side flange surface 13. A first housing portion 4 accommodating the first lens L1 in the lens holder 2 includes a regulation portion 42 regulating a position of the first lens L1 in the optical axis L direction. The regulation portion 42 includes a lens seating surface 40 in contact with the first lens L1. The image-side flange surface 13 of the first lens L1 includes an outer peripheral region 13A in contact with the lens seating surface 40 of the regulation portion 42 and an inner peripheral region 13B in which a flexible printed circuit board 8 is disposed.

Abstract: An O-ring seals between a first lens and a lens barrel. Further, between the second lens and the lens barrel is also sealed by a first adhesive layer. The lens barrel, in a state before manufacturing of the lens unit, is provided with a communication passage that communicates an inside of the lens barrel with an outer peripheral groove (outside of the lens barrel. The communication passage, in the state of FIG. 1 after manufacturing, is sealed by a second adhesive layer (third seal member) made of an adhesive.

Abstract: A lens unit may include a plurality of lenses, and a mirror cylinder that holds the plurality of lenses. At least one of the plurality of lenses may include a glass lens held in a lens holder having a cylinder part. The lens holder may include an annular projection part that protrudes radially inward from the cylinder part, on the opposite side of the cylinder part from an installation opening for the glass lens. The glass lens may be press-fitted and fixed in the cylinder part with a gap between the glass lens and the annular projection part.

Abstract: A lens assembly may include a plurality of lenses; and a lens barrel holding the plurality of lenses. At least one of the lenses may include a glass lens press-fit and held in a lens holder comprising a cylindrical portion. An adhesive-agent groove connected to a fitting hole inlet may be disposed in a face of the lens holder adjacent to the fitting hole inlet to retain an adhesive agent injected into the adhesive-agent groove, the glass lens being fit to the lens holder via the fitting hole inlet. Catches protruding along a direction of an optical axis may be disposed inside the adhesive-agent groove. An adhesive agent may be disposed in a gap formed between a side face of the glass lens and the catches face facing each other, the adhesive agent fixing the glass lens to the lens holder.

Abstract: A lens unit may include lenses and a holder in a tube shape which holds the lenses on an inner side such that in the lenses, a side face of a first lens located on a most object side may include a first side face part which is extended from an outer edge of a first face that is an object side face of the first lens toward an image side, a second side face part which is extended from an object side toward the image side on the image side with respect to the first side face part and an outer side in a radial direction with respect to the first side face part; and a third side face part which connects an image side end part of the first side face part with an object side end part of the second side face part.

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: An optical unit is provided. In the optical unit, a holder holding part is provided with a guide part determining a first center axial line that is a reference and the tube part is provided with a guided part determining a second center axial line coincided with an optical axis of the lenses. A guided part is positioned by the guide part. A circuit board holding part is provided with a positioning part with which the circuit board is abutted and at least one of the circuit board holding part and the circuit board includes a fixed part through which the circuit board is fixed to the circuit board holding part so that a position of the circuit board to the circuit board holding part is capable of being adjusted in a direction perpendicular to the first center axial line.

Abstract: A lens assembly may include a plurality of lenses; and a lens barrel holding the plurality of lenses. At least one of the lenses may include a glass lens press-fit and held in a lens holder comprising a cylindrical portion. An adhesive-agent groove connected to a fitting hole inlet may be disposed in a face of the lens holder adjacent to the fitting hole inlet to retain an adhesive agent injected into the adhesive-agent groove, the glass lens being fit to the lens holder via the fitting hole inlet. Catches protruding along a direction of an optical axis may be disposed inside the adhesive-agent groove. An adhesive agent may be disposed in a gap formed between a side face of the glass lens and the catches face facing each other, the adhesive agent fixing the glass lens to the lens holder.

Abstract: A lens assembly may include a plurality of lenses; and a lens barrel holding the plurality of lenses. At least one of the lenses comprises a glass lens press-fit and held in a lens holder comprising a cylindrical portion. The lens holder may include a press-fit portion into which a side face of the glass lens is press-fit, and a portion of the side face of the glass lens adjacent to a non-fitting hole inlet protrudes farther than the press-fit portion of the lens holder in a direction of an optical axis.

Abstract: A lens unit may include a first lens closest to an object side; a plurality of lenses at an imaging side of the first lens; and a lens tube holding the first lens and the plurality of lenses. The lens tube may include a first lens tube portion holding the first lens and a second lens tube portion holding the plurality of lenses. The lens tube may include a circumferential groove recessed between an inner circumference of the second lens tube portion and an outer circumference of the lens tube. When viewed in a direction perpendicular to an optical axis, a bottom of the circumferential groove may be located at the imaging side in a depth that is more than a thickness of a second lens in a direction of the optical axis, the second lens being located closest to the object side among the plurality of lenses.

Abstract: A lens unit may include a plurality of lenses, and a mirror cylinder that holds the plurality of lenses. At least one of the plurality of lenses may include a glass lens held in a lens holder having a cylinder part. The lens holder may include an annular projection part that protrudes radially inward from the cylinder part, on the opposite side of the cylinder part from an installation opening for the glass lens. The glass lens may be press-fitted and fixed in the cylinder part with a gap between the glass lens and the annular projection part.

Abstract: An optical unit is provided. In the optical unit, a holder holding part is provided with a guide part determining a first center axial line that is a reference and the tube part is provided with a guided part determining a second center axial line coincided with an optical axis of the lenses. A guided part is positioned by the guide part. A circuit board holding part is provided with a positioning part with which the circuit board is abutted and at least one of the circuit board holding part and the circuit board includes a fixed part through which the circuit board is fixed to the circuit board holding part so that a position of the circuit board to the circuit board holding part is capable of being adjusted in a direction perpendicular to the first center axial line.

Abstract: A lens unit may include at least four lens groups and a tube-shaped holder holding the lens groups. The tube-shaped holder is provided with a second lens group holding part provided with a protruded part surrounding an outer peripheral end part of the second lens group through a gap space and the protruded part is provided with a caulked part which is deformed so as to cover the outer peripheral end part from the object side. The protruded part may be provided with a thick portion and a thin portion extended to the front side from the thick portion and the thin portion is caulked by being plastically deformed to be the caulked part. After the second lens group is mounted on an inner side to the protruded part, the position of the second lens group is adjusted and then a caulked part is formed.

Abstract: A lens unit may include at least four lens groups and a tube-shaped holder holding the lens groups. The tube-shaped holder is provided with a second lens group holding part provided with a protruded part surrounding an outer peripheral end part of the second lens group through a gap space and the protruded part is provided with a caulked part which is deformed so as to cover the outer peripheral end part from the object side. The protruded part may be provided with a thick portion and a thin portion extended to the front side from the thick portion and the thin portion is caulked by being plastically deformed to be the caulked part. After the second lens group is mounted on an inner side to the protruded part, the position of the second lens group is adjusted and then a caulked part is formed.

Abstract: An objective lens driving apparatus comprises a lens holder supporting an objective lens, a support shaft which enables the lens holder to be contactingly movable in the focusing direction and rotatable in the tracking direction, a driving coil for focusing and a driving coil for tracking which are mounted on the outer surface of the lens holder in the circumference direction, an outer yoke which is positioned opposite from the outer surface of the lens holder and first and second arched magnets which are mounted on the inner surface of the yoke in the circumference direction. The driving coil for focusing is a hollow coil which is positioned such that its hollow core lies in the focusing direction wherein an inner yoke mounted on the outer yoke passes through the hollow core. The driving coil for tracking being a hollow coil which is positioned such that its hollow faces from the outer surface of the lens holder to the inner surface of the outer yoke.