Abstract: A method of manufacturing a lens barrel assembly includes forming a lens barrel by deep drawing into a cylindrical shape, forming a lens-retaining portion that retains a lens at one of two open sides of the lens barrel, and forming a component-receiving portion that receives an electric component at the other open side of the lens barrel. The lens-retaining portion has an outer diameter that is smaller than an outer diameter of the component-receiving portion and a wall thickness that is larger than a wall thickness of the component-receiving portion.

Abstract: A lens barrel assembly includes a cylindrical lens barrel obtained by deep drawing a metal sheet and a lens retained by the lens barrel. The lens barrel has a lens-retaining portion for retaining the lens at one of two open sides and a component-receiving portion for receiving an electric component at the other open side, the lens-retaining portion having an outer diameter that is smaller than an outer diameter of the component-receiving portion and a wall thickness that is larger than a wall thickness of the component-receiving portion.

Abstract: A cylindrical holder material having a thin deformed portion is located in a press forming die. An optical element material is installed inside the holder material and the holder material and the optical element material are heated to their respective softening temperatures, thereby forming a cylindrical holder from the holder material and an optical element from the optical element material by press forming the holder material and the optical element material that have been heated to their respective softening temperatures. Thus, the optical element is integrated inside the holder and the deformed portion of the holder is deformed towards the outside thereof by a pressing force applied by the optical element.

Abstract: A lens is fitted into a metal ring that covers the outer peripheral surface of the lens and can be soldered to a fixture member. The side cylindrical part of the metal ring is expanded toward the outer peripheral direction thereof by the pressure of the optical material put inside it, and, thus expanded, it defines the final dimension of the metal ring. One of the two openings formed on both sides of the side cylindrical part of the metal ring is so designed as to have a curving cylindrical part that extends from the side cylindrical part, and this curving cylindrical part is folded toward the optical functional face of the optical device to construct a metal ring-fitted optical device.

Abstract: A camera module includes a lens held in a cylindrical holder and an image sensor disposed at a predetermined distance from the lens. The image sensor is disposed on a substrate. The holder integrally has a protrusion that protrudes toward the image sensor and an outer peripheral portion provided outside the protrusion, the lower end of the outer peripheral portion being lower than the lower end of the protrusion. The lower end surface of the protrusion is fixed to the upper surface of the image sensor with an adhesive, and the lower end surface of the outer peripheral portion is fixed to the upper surface of the substrate with an adhesive.

Abstract: A holder/optical-element assembly includes a holder and an optical element disposed within the holder. The holder has an inner periphery surface in which at least one opening is provided, and the optical element is formed with at least one protrusion extending outward from an outer periphery of the optical element. The protrusion of the optical element is engaged with the opening of the holder.

Abstract: A metal ring for an optical element that is served to cover a peripheral side surface of a lens and served to fix the lens to a mounting member by means of soldering is provided with a thin-wall sleeve a diameter of which is expanded toward a peripheral direction by means of pressure received from an optical material disposed inside the metal ring to thereby obtain a final peripheral side surface size, a thin-wall portion having an inside periphery near an extension of an inside peripheral surface of the thin-wall sleeve on one of apertures of the thin-wall sleeve, and a holding portion comprising a flange that projects from an edge of the aperture toward the aperture. A metal ring for an optical element, a method for fabrication of the optical element having the metal ring, and an optical element having a metal ring of the invention employ the abovementioned metal ring.

Abstract: An optical fiber connector includes a receptacle casing, a cylinder provided in the receptacle casing, and a wire spring disposed on the inner wall of the cylinder. In the optical fiber connector, a fiber holding part provided at an end of an optical fiber is inserted into the cylinder, the outer periphery of the fiber holding part is elastically pressed by the wire spring in the direction perpendicular to an optical axis of the optical fiber, the outer periphery of the fiber holding part is brought into abutment with the inner wall of the cylinder, and the end of the optical fiber is fitted to the receptacle casing.

Abstract: Provided is a high-precision holder-mounted optical element that makes it possible to correct a volume error of an optical element material. In a holder-mounted optical element 1 where an optical element 20 is accommodated into a cylindrical holder 10, the holder 10 has a thin deformation portion 12 that is deformed by the pressure applied from the inner circumferential side thereof and a surplus portion 21a, which press-contacts with the deformation portion 12, is formed in the optical element 20.

Abstract: An optical semiconductor device to increase optical communication speed has a silicon substrate with an etched V-shaped first groove portion, a light emitting element which has an optical axis in the direction of the first groove portion and is mounted to the upper surface of the silicon substrate, and a high NA aspheric lens is mounted in the first groove portion. The first groove portion is composed of first and second opposing inclined surfaces and a third inclined surface perpendicular to the first and second inclined surfaces. A slit is cut in the silicon substrate extends in a direction perpendicular to the direction of the first groove portion and includes the first, second, and third inclined surfaces. The aspheric lens is mounted to the first and second inclined surfaces and has a part thereof protruding in the slit.

Abstract: A cylindrical holder material having a thin deformed portion is located in a press forming die. An optical element material is installed inside the holder material and the holder material and the optical element material are heated to their respective softening temperatures, thereby forming a cylindrical holder from the holder material and an optical element from the optical element material by press forming the holder material and the optical element material that have been heated to their respective softening temperatures. Thus, the optical element is integrated inside the holder and the deformed portion of the holder is deformed towards the outside thereof by a pressing force applied by the optical element.

Abstract: A method for making a holder/optical-element assembly includes the steps of positioning a cylindrical holder material in a press-molding die, the holder material having a void part in the inner circumferential surface, positioning an optical-element material inside the holder material, heating the holder material and the optical-element material to their own softening temperatures, press-molding the holder material and the optical-element material to form a cylindrical holder and an optical element, respectively, thereby fixing the optical element to the inside of the holder, allowing a part of the optical element to project outwardly from the outer edge by pressure created during press-molding, and retaining the projected portion in the void part of the holder.

Abstract: Provided is a high-precision holder-mounted optical element that makes it possible to correct a volume error of an optical element material. In a holder-mounted optical element 1 where an optical element 20 is accommodated into a cylindrical holder 10, the holder 10 has a thin deformation portion 12 that is deformed by the pressure applied from the inner circumferential side thereof and a surplus portion 21a, which press-contacts with the deformation portion 12, is formed in the optical element 20.

Abstract: A holder/optical-element assembly includes a holder and an optical element disposed within the holder. The holder has an inner periphery surface in which at least one opening is provided, and the optical element is formed with at least one protrusion extending outward from an outer periphery of the optical element. The protrusion of the optical element is engaged with the opening of the holder.

Abstract: An end face of a plastic optical fiber end is treated so as not to extrude to the core side face when the plastic optical fiber end is softened and fused. The core end face of the plastic optical fiber end is pressed intermittently on a mold that is heated to a certain temperature to soften and fuse the core end face to thereby transfer the transfer face of the mold on the core end face.

Abstract: An optical semiconductor device to increase optical communication speed has a silicon substrate with an etched V-shaped first groove portion, a light emitting element which has an optical axis in the direction of the first groove portion and is mounted to the upper surface of the silicon substrate, and a high NA aspheric lens is mounted in the first groove portion. The first groove portion is composed of first and second opposing inclined surfaces and a third inclined surface perpendicular to the first and second inclined surfaces. A slit is cut in the silicon substrate extends in a direction perpendicular to the direction of the first groove portion and includes the first, second, and third inclined surfaces. The aspheric lens is mounted to the first and second inclined surfaces and has a part thereof protruding in the slit.

Abstract: An optical semiconductor device to increase optical communication speed has a silicon substrate with an etched V-shaped first groove portion, a light emitting element which has an optical axis in the direction of the first groove portion and is mounted to the upper surface of the silicon substrate, and a high NA aspheric lens is mounted in the first groove portion. The first groove portion is composed of first and second opposing inclined surfaces and a third inclined surface perpendicular to the first and second inclined surfaces. A slit is cut in the silicon substrate extends in a direction perpendicular to the direction of the first groove portion and includes the first, second, and third inclined surfaces. The aspheric lens is mounted to the first and second inclined surfaces and has a part thereof protruding in the slit.

Abstract: A lens is fitted into a metal ring that covers the outer peripheral surface of the lens and can be soldered to a fixture member. The side cylindrical part of the metal ring is expanded toward the outer peripheral direction thereof by the pressure of the optical material put inside it, and, thus expanded, it defines the final dimension of the metal ring. One of the two openings formed on both sides of the side cylindrical part of the metal ring is so designed as to have a curving cylindrical part that extends from the side cylindrical part, and this curving cylindrical part is folded toward the optical functional face of the optical device to construct a metal ring-fitted optical device.

Abstract: An optical element includes a lens holder, and an optical lens integrally held by an inner wall portion of the lens holder and having a lens optical surface at an opening in the lens holder in the direction of the optical axis of the optical lens. A projecting portion is formed in the inner wall portion of the lens holder and adjacent to the opening. An outer peripheral edge surface of the lens optical surface is placed under the projecting portion and is pressed in contact with the projecting portion over the entire periphery.

Abstract: A beam-splitting/coupling apparatus comprises first and second frame member which each have a contact surface and a beam guide path. An optical filter is provided between the contact surfaces with the front and rear surfaces of the optical filter held by the first and second frame members respectively. The first and second frame members are held in a case by external flexible forces. A beam propagates from the beam guide path of the first frame member to the beam guide path of the second frame member by way of the optical filter. As a result, the optical filter can be installed firmly with ease. In addition, the effect of the installed optical filter on optical performance can be reduced.