Abstract: A joining structure includes: a first tube made of a first metal or alloy; a second tube made of a second metal or alloy different from the first metal or alloy; a coupling member having a cylindrical shape to provide therein a passage into which the first and second tubes are insertable, and having an opening on a side face thereof to penetrate into the passage; and a brazing material injected into the passage through the opening with an end face of the first tube and an end face of the second tube abutting on each other in the passage to braze the first tube, the second tube, and the coupling member. The second metal or alloy is more easily oxidizable than the first metal or alloy during brazing. An abutting position between the first and second tubes is deviated from the opening toward the second tube.

Abstract: A joining structure includes: a first tube made of a first metal or alloy; a second tube made of a second metal or alloy different from the first metal or alloy; a coupling member having a cylindrical shape to provide therein a passage into which the first and second tubes are insertable, and having an opening on a side face thereof to penetrate into the passage; and a brazing material injected into the passage through the opening with an end face of the first tube and an end face of the second tube abutting on each other in the passage to braze the first tube, the second tube, and the coupling member. The second metal or alloy is more easily oxidizable than the first metal or alloy during brazing. An abutting position between the first and second tubes is deviated from the opening toward the second tube.

Abstract: This lens barrel includes a lens-receiving surface that extends in an intersection direction intersecting the central axis; a side frame portion that is arranged further outward than the lens-receiving surface in the intersection direction and that protrudes in the direction of the central axis from the lens-receiving surface; and a plurality of caulking portions that are formed at a tip portion of the side frame portion in the protruding direction and are deformed by external pressure to caulk and fix a lens between the caulking portions and the lens-receiving surface. The lens-receiving surface is formed so as to be axisymmetrical to the central axis.

Abstract: A method for joining pipes in which a first pipe in which at least one portion to be engaged is sunk inward to an inner circumferential surface side provided in an outer circumferential surface of an end portion of the first pipe, and a second pipe made of thermoplastic resin are joined together. The method includes: inserting an end portion of the first pipe into an end portion of the second pipe; and as a result of a component that transmits ultrasonic waves against an outer circumferential surface of the second pipe that corresponds to the portion to be engaged of the inserted first pipe, softening the second pipe by the ultrasonic waves so that an engaging portion is formed which is made to protrude into the portion to be engaged and is positioned on the inner circumferential surface of the first pipe.

Abstract: This lens barrel includes a lens-receiving surface that extends in an intersection direction intersecting the central axis; a side frame portion that is arranged further outward than the lens-receiving surface in the intersection direction and that protrudes in the direction of the central axis from the lens-receiving surface; and a plurality of caulking portions that are formed at a tip portion of the side frame portion in the protruding direction and are deformed by external pressure to caulk and fix a lens between the caulking portions and the lens-receiving surface. The lens-receiving surface is formed so as to be axisymmetrical to the central axis.

Abstract: A method for joining pipes in which a first pipe in which at least one portion to be engaged is sunk inward to an inner circumferential surface side provided in an outer circumferential surface of an end portion of the first pipe, and a second pipe made of thermoplastic resin are joined together. The method includes: inserting an end portion of the first pipe into an end portion of the second pipe; and as a result of a component that transmits ultrasonic waves against an outer circumferential surface of the second pipe that corresponds to the portion to be engaged of the inserted first pipe, softening the second pipe by the ultrasonic waves so that an engaging portion is formed which is made to protrude into the portion to be engaged and is positioned on the inner circumferential surface of the first pipe.

Abstract: There is provided a fixing method for fixing components together in which two components in the form of a first component and a second component are positioned such that they are mutually superimposed in predetermined relative positions, and are then fixed together, wherein the first component has at least two portions for engagement that are recessed in a contact surface thereof which is placed against the second component towards a surface thereof which is located on an opposite side from the contact surface, and the second component is formed from thermoplastic resin and has at least two protruding portions that protrude from positions that correspond to the portions for engagement of the first component on a surface of the second component which is located on the opposite side from a contact surface thereof which is placed against the first component, and wherein the fixing method for fixing components together includes: a first step in which the contact surfaces of both the first component and the second

Abstract: There is provided a fixing method for fixing components together in which two components in the form of a first component and a second component are positioned such that they are mutually superimposed in predetermined relative positions, and are then fixed together, wherein the first component has at least two portions for engagement that are recessed in a contact surface thereof which is placed against the second component towards a surface thereof which is located on an opposite side from the contact surface, and the second component is formed from thermoplastic resin and has at least two protruding portions that protrude from positions that correspond to the portions for engagement of the first component on a surface of the second component which is located on the opposite side from a contact surface thereof which is placed against the first component, and wherein the fixing method for fixing components together includes: a first step in which the contact surfaces of both the first component and the second

Abstract: The present invention is a method for joining pipes in which a first pipe in which at least one portion to be engaged that is sunk inward to an inner circumferential surface side is provided in an outer circumferential surface of an end portion of the first pipe, and a second pipe that is made of thermoplastic resin are joined together, and includes: a first step in which an end portion of the first pipe is inserted into an end portion of the second pipe; and a second step in which, as a result of a transmitting component that transmits ultrasonic waves being pressed against a position on an outer circumferential surface side of the second pipe that corresponds to the portion to be engaged of the inserted first pipe, the second pipe is softened by the ultrasonic waves so that an engaging portion is formed which is made to protrude into the portion to be engaged, which is positioned on the inner circumferential surface side of the first pipe, and becomes engaged with this portion to be engaged.

Abstract: A manufacturing method for a bending portion of a medical insertion apparatus includes, preparing a bending tube including cylindrical bending parts coaxially connected to each other and rotatable with respect to each other, preparing a braid tube including liner members made of a thermoplastic resin and forming a netlike shape, covering the braid tube on an outer peripheral portion of the bending tube, pushing-heating of protruding inwardly a part of the braid tube to be pushed into a push-in receiving portion of the bending part and heating the part to soften, and pushing-cooling of cooling the part to set.

Abstract: An insertion section of an endoscope has a flexible tube portion and a bending portion whose proximal end portion is coupled with a distal end of the flexible tube portion, a plurality of node rings are aligned in a bending tube serving as a base body portion of the bending portion, opening portions as through openings are provided in a node ring, protruding portions each having substantially the same shape as the opening portion are provided on an outer peripheral surface of a joint portion of the flexible tube portion that is inserted into the node ring, and a coupling structure according to the present invention couples the bending portion with the flexible tube portion by inserting the joint portion into the node ring and fitting the protruding portions into the opening portions.