JPH078807U - Optical connector - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide an optical connector in which the fixing strength of the optical fiber cord 1 is remarkably improved, and cracks in the coating layer of the optical fiber cord 1 are less likely to grow and which is detached and whose durability is remarkably improved. [Structure] The pressure contact fixing portion 3 of the clamper B has a sharp locking portion 3a for locking the surface of the optical fiber cord 1 and a curvature surface close to the outer diameter of the cord, and has a predetermined length of the optical fiber cord 1. An optical connector which is constructed by providing a curved surface pressure contact portion 3b which is in contact with the range in a held state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an optical connector for optical fiber.

[0002]

[Prior art]

 A conventional optical connector is, for example, as shown in FIGS. 5 and 6, a housing A provided with a guide portion 22 for arranging an optical fiber cord 21 at a predetermined position, and the optical fiber cord 21 arranged in the housing A. And a clamper B having a press-contacting fixing portion 23 for press-fixing and fixing. The press-contacting fixing portion 23 of the clamper B is formed by bending a metal press-contacting plate at two front and rear portions integrally and vertically from a top plate portion. The front and rear pressure contact plates are each formed with a notch for escaping the cord 21, and the lower inner edge of the notch has a tapered inner edge for pressing and locking the surface coating layer of the cord 21 with a sharp locking portion. It is formed as 23a. Therefore, the conventional method of fixing the optical fiber cord 21 to the optical connector is to insert the end portion of the optical fiber cord 21 into the housing A of the optical connector and attach the clamper B to the housing A to form two plate-shaped members. The sharp locking portion 23a is sharply pressed and locked to the coating layer of the optical fiber cord 1 to lock and fix the optical fiber cord 21.

[0003]

[Problems to be solved by the device]

 Therefore, in the conventional example, the optical fiber cord 21 has only the plate-shaped sharp locking portion 23a pressed and locked into the coating layer of the optical fiber cord 21 from the direction perpendicular to the length direction of the optical fiber cord 21. For this reason, when a tensile force is applied to the optical fiber cord 21, there is a problem that the crack spreads from the pressure contact portion to the cord coating layer, and as a result, the optical fiber cord 21 comes out from the housing A. In the structure of the conventional clamper B (the structure of the pressure contact fixing portion 23), the sharp inner locking portion is formed at the notched inner edge of the metal plate so as to easily bite into the cord coating layer. Since a part of the cord coating layer is sharply cut, cracks and damages in the cord coating layer grow from here due to tensile force.

Further, if the clamper B is made of metal, its shape is complicated and small, so that the productivity is poor and the price becomes high. Further, when the optical fiber cord 21 is fixed to the optical connector during normal use, the housing A is made of a thermoplastic resin, so that the clamper B portion has a strong discomfort in appearance.

An object of the present invention is to solve the above problems.

[0006]

[Means for Solving the Problems]

 The gist of the present invention will be described with reference to the accompanying drawings.

A housing A provided with a guide portion 2 for arranging the optical fiber cord 1 at a predetermined position, and a clamper B having a pressure contact fixing portion 3 for pressing and fixing the optical fiber cord 1 disposed in the housing A. In the optical connector formed by fitting together, the pressure contact fixing portion 3 has a sharp locking portion 3a for locking the surface of the optical fiber cord 1 and a curvature surface close to the outer diameter of the cord. The present invention relates to an optical connector, characterized in that a predetermined length range of the optical fiber cord 1 is arranged side by side with a curved surface pressure contact portion 3b that comes into contact with each other in a holding state.

[0008]

[Action]

 The coating layer on the outer periphery of the optical fiber cord 1 is pressed and fixed by the sharp engagement portion 3a and the curved surface pressure contact portion 3b. Therefore, not only the locking by the sharp locking portion 3a, but also the predetermined length range of the optical fiber cord 1 is held by the curved surface pressing portion 3b in an embracing state so as to assist this. Even if tensile force is applied to the fiber cord 1, the pressure contact friction surface is wide, so the fixing strength is improved, and even if the coating layer of the optical fiber cord 1 is cracked by the sharp locking portion 3a, this crack portion is difficult to grow. The detachment durability will be remarkably improved.

[0009]

【Example】

 This embodiment is shown in FIGS.

The optical connector of this embodiment is formed by fitting a clamper B having a pressure contact fixing portion 3 into a fitting hole 4 of a housing A having a fitting portion 8. The pressure contact fixing portion 3 is sharply locked. It is composed of a portion 3a and a curved surface pressure contact portion 3b, and is made by integrally molding the housing A and the clamper B with the same or similar thermoplastic resin material, for example, injection molding using PBT. ing.

The clamper B (pressure contact fixing portion 3) which is the gist of the present invention will be described.

Locking claw rods 5 that are locked in the housing A are vertically provided from four positions in the front, rear, left and right of a top plate portion 7 that is mounted flush with the fitting hole 4 of the housing A. The curved surface pressure contact portions 3b are set so that they are arranged at two positions in the longitudinal direction of the optical fiber cord 1 on the lower surface of the top plate portion 7 between the rods 5 at predetermined intervals. ), A sharply locking portion 3a protruding slightly in a plate shape is provided in a continuous state with the curved surface pressure contact portion 3b. The curvature of the curved pressure contact portion 3b is set to be the same as the outer diameter φ2.2 mm of the optical fiber cord 1, and the sharp locking portion 3a is used for fixing the optical fiber cord 1 to the optical fiber 1 ′ (outer diameter φ1.0 mm in the embodiment). The optical fiber 1'is arranged so that it is positioned at 0.75 mm in the shortest distance from the center position of the optical fiber 1'and press-contacted with the coating layer of the optical fiber 1 '. In order to suppress the influence of lateral pressure on 1 ', the total length was set to 5 mm or less at two locations.

As described above, in the present embodiment, the sharp locking portion 3a and the curved surface pressure contact portion 3b are continuously connected to each other and integrally molded with resin to form the clamper B having the pressure contact fixing portion 3. Mass production is possible only by going through the shaping process, and since the housing A and clamper B are made of the same material, there is no discomfort in appearance.

In the figure, reference numeral 6 is a support portion of the optical fiber cord 1 forming the guide portion 2.

The shape, the number and the arrangement of the sharp engaging portion 3a and the curved surface pressure contact portion 3b can be designed appropriately. For example, the surface treatment of the curved surface pressure contact portion 3b is roughly set to cause friction with the surface of the cord coating layer. Can be strengthened to increase the fixing strength.

Further, as in the conventional example, the pressure contact fixing portion 3 is not only contacted by the sharp engaging portion 3a but also by the curved surface pressure contact portion 3b, so that the fixing strength is remarkably improved as described above.

Further, since the material of the clamper B is resin instead of metal, the curved surface pressure contact portion 3 can be easily formed, the coating damage of the optical fiber cord 1 is small, the mass productivity is excellent, and there is no discomfort with the housing A. It becomes an optical connector.

[0018]

[Effect of device]

 Since the optical connector is constructed as described above, the fixing strength of the optical fiber cord is remarkably improved, cracks in the coating layer of the optical fiber cord are hard to grow, and the optical connector is remarkably improved in detachability.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of the present embodiment.

FIG. 2 is a perspective view of the clamper of the present embodiment in an upside down state.

FIG. 3 is a cross-sectional view of a sharp engaging portion in a used state according to the present embodiment.

FIG. 4 is a cross-sectional view of a curved surface pressure contact portion in a used state in this state.

FIG. 5 is an exploded perspective view of a conventional example.

FIG. 6 is a cross-sectional view of a conventional example in use.

[Explanation of symbols]

 1 optical fiber cord 2 guide part 3 pressure contact fixing part 3a sharp locking part 3b curved surface pressure contact part A housing B clamper

Claims (1)

[Scope of utility model registration request] 1. A housing provided with a guide portion for arranging an optical fiber cord at a predetermined position, and a clamper having a press-contact fixing portion for press-fixing the optical fiber cord arranged in the housing are fitted to each other. In the optical connector, the pressure contact fixing part has a sharp locking part for locking the surface of the optical fiber cord, and a curvature surface close to the outer diameter of the cord to hold a predetermined length range of the optical fiber cord. An optical connector characterized in that a curved surface pressure contact portion that is in contact with each other in a state is provided side by side.