JPH0894880A - Optical receptacle - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an inexpensive optical receptacle with a simple structure. An optical connector plug 4 in which a first ferrule 31 is mounted from the base end side of the housing 11 and is connected to the first ferrule 31 and the tip end side of the housing 11.
A sleeve 19 (20) for fitting the second ferrule 42 of No. 1 and aligning the two is provided, and a locking claw 13 for holding the first ferrule 31 is formed at the base end of the housing, while the distal end is formed. The optical receptacle 10 is configured by forming the locking claw 16 that holds the optical connector plug 41 at the fitting position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical receptacle to be combined with an optical connector plug, and to connect an apparatus having a built-in circuit of an input portion or an output portion of an optical signal and an optical connector plug attached to an external optical cord. It is suitable to be applied to a part.

[0002]

2. Description of the Related Art As an optical connector used for connecting optical fibers to each other, there is, for example, an F04 type single-core optical fiber connector defined in JIS C 5973, which is generally called an SC type optical connector. It is widely used in optical transmission systems. In the SC type optical connector, an optical fiber such as a photo diode (hereinafter referred to as PD) or a laser diode (hereinafter referred to as LD) and an optical fiber can be attached / detached at an input portion or an output portion of an optical signal. There is an optical receptacle as a component to be coupled to.

FIG. 8 schematically shows a conventional SC type optical receptacle. As shown in FIG. 8, a conventional optical receptacle 10 is used.
1 has an interface equivalent to a connection adapter in an SC type optical connector, and a housing 102 has an inner cylinder 10 in which a precision sleeve 103 and a locking portion 104 are formed.
5, an outer cylinder 106 into which the inner cylinder 105 fits, and a substrate 107 that supports both. Then, from the base end of the housing 102 to the lens 108 and the PD
Alternatively, an optical element 109 such as an LD is mounted.

In this conventional optical receptacle, the lens 108 and the optical element 10 are arranged on the central axis of the housing 102.
9 and the like are fixed for axial alignment with the optical fiber, but when a single mode optical fiber is used, very high accuracy is required for alignment between the precision sleeve 103 and the optical element 109, and The precision sleeve 103 itself also needs to be highly accurate, which increases the cost of the optical receptacle itself.

On the other hand, in some cases, it is better to mount an optical fiber in advance on the optical element and connect the fibers to each other. In particular, when an optical fiber is connected to an optical waveguide instead of an optical element alone, it is difficult to directly attach the optical receptacle to the end face of the waveguide. In order to detachably connect the bigtail-shaped optical fiber attached to the optical circuit and the external optical cord, it is best to attach an optical connector to each optical fiber and connect via an adapter. Moreover, the connection characteristics are also good. As such an optical connector, the above-mentioned SC type optical connector is widely used.

FIG. 9 schematically shows a conventional SC type optical connector. As shown in FIG. 9, in order to configure the input / output portion of the device using the optical connector, for example, the SC type optical connector plug 202 is attached to the tip of the optical fiber bigtail 201 attached to the optical circuit, and the device is attached. This SC type optical connector plug 202 may be coupled to the SC type optical connection adapter 203 attached to the panel part of the above. In this case, SC
A sleeve 205 and a locking portion 206 are formed on the housing 204 of the optical connection adapter 203. Therefore,
Then, in order to connect with the optical cable outside the device, S
Optical cable 207 facing the C-type optical connection adapter 203
The plug 208 attached to is connected.

[0007]

In the above-mentioned SC type optical connector, the ferrule floats inside the plug housing, and the plug housings and the ferrule and the sleeve are independently fitted to each other. The optical cord is highly resistant to tensile force and bending applied from the outside, and the connection characteristics are not affected even when such external force is applied during connection. However, the SC type optical connector is used under a variety of situations, and, for example, no external force acts on the optical cord inside the device. Therefore, it is wasteful to use the above-mentioned SC type optical connector where such an external force does not act on the optical cord, which is disadvantageous in terms of cost and mounting space.

The present invention solves such a problem, and an object of the present invention is to provide an inexpensive optical receptacle having a simple structure.

[0009]

SUMMARY OF THE INVENTION An optical receptacle of the present invention for achieving the above object is an optical receptacle attached to one optical transmission component for connecting optical transmission components to each other. The first ferrule is mounted from the base end side of the housing, the first ferrule is fitted inside, and the second ferrule of the optical connector plug connected to the tip end side of the housing is fitted. A sleeve for aligning the first and second ferrules is provided, and a first locking portion for holding the first ferrule is formed at a proximal end portion of the housing, while a distal end portion of the housing is provided. A fitting part for fitting the optical connector plug and a second part for holding the optical connector plug in the fitting position
It is characterized in that a locking portion is formed.

Further, the optical receptacle according to the present invention is characterized in that the housing is provided with a third locking portion for preventing the first ferrule fitted to the base end side of the housing from rotating in the circumferential direction. To do.

Further, the optical receptacle of the present invention is characterized in that the sleeve, the first locking portion and the second locking portion are integrally molded in the housing.

[0012]

The first ferrule held by the first locking portion at the base end portion of the housing is fitted into the sleeve, while the optical connector plug connected to the distal end side of the housing is connected to the second ferrule. By fitting and aligning with the sleeve and being held by the second locking portion at the fitting position, it is possible to secure the same optical characteristics as the conventional one with a simple structure.

Since the first ferrule fitted to the base end side of the housing is prevented from rotating in the circumferential direction by the third locking portion, the first ferrule can be held at the optimum mounting position.

A sleeve and a first locking portion on the housing;
Since the second locking portion is integrally formed, it becomes inexpensive.

[0015]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a longitudinal cross section of an optical receptacle according to an embodiment of the present invention (II cross section of FIG. 3), and FIG. 2 is a cross section of this optical receptacle (II-II cross section of FIG. 3). FIG. 4 is a left side view of the optical receptacle, FIG. 4 is a right side view of the optical receptacle, FIG. 5 is a vertical section of the housing, FIG. 6 is a horizontal section of the housing, and FIG. Indicates.

The optical receptacle of this embodiment is attached to one optical transmission component in order to connect the optical transmission components to each other. As shown in FIGS. 5 and 6, the housing 11 has a tubular shape. None, the first ferrule 31 at the base end
The main body 32 (see FIGS. 1 and 2) has a mounting portion 12 to be mounted on the inner peripheral portion, and the end portion of the mounting portion 12 is positioned at the left and right to mount the first ferrule main body 32 at the mounting position. A pair of locking claws 13 for holding the first ferrule body 32 is formed on the inner peripheral surface of the mounting portion 12 so as to prevent the first ferrule body 32 from rotating in the circumferential direction. . On the other hand, a fitting portion 15 into which the tip portion of the optical connector plug 41 (see FIG. 7) to be connected is fitted is formed at the tip portion of the housing 11, and the fitting portion 15 is located above and below. A pair of locking claws 16 for holding the optical connector plug 41 at the fitting position is formed. Also, the housing 11
An outer cylinder portion 17 is formed on the outer peripheral side of the fitting portion 15 and the locking claw 16, and a mounting flange 18 is formed in the middle portion.
Are formed.

A cylindrical sleeve 19 is formed in the center of the housing 11, and the sleeve 19 is formed.
The optical connector plug 4 to which the first ferrule 31 mounted from the base end side is fitted and connected to the inner peripheral surface of the
By fitting the second ferrule 42 of No. 1,
Also, a split sleeve 20 is mounted to align the second ferrules 31 and 42 in the axial direction. The housing 11 formed in this way is formed by the two dies that are separated in the axial direction, and the mounting portion 12 and the locking claws 13, the locking groove 14, the fitting portion 15, the locking claws 16, the outer cylinder part are formed by the two molds. 17, the mounting flange 18, the sleeve 19 and the like are integrally formed as a molded product.

On the other hand, as shown in FIGS. 1 to 4, the first ferrule 31 engages with each locking groove 14 formed in the mounting portion 12 of the housing 11 on the outer peripheral surface of the cylindrical main body 32. The first ferrule main body 32 is knurled so that it cannot rotate in the circumferential direction. A first optical fiber 33 is coupled to the first ferrule 31. The optical connector plug 41 to be connected is
As shown in FIG. 7, it has a second ferrule 42, and the second ferrule 42 has a second optical fiber 4
3 are connected.

Therefore, the optical receptacle 10 of the present embodiment.
Is a tubular housing 11 as shown in FIGS.
The first ferrule 32 is attached from the base end side of the and is held by the locking claw 13, and the front end thereof is the split sleeve 20.
And the sleeve main body 32 is engaged with the locking groove 14 so that the sleeve main body 32 is held so as not to rotate in the circumferential direction. And
The housing 11 is formed by forming a fitting portion 15 into which the optical connector plug 41 is fitted and a locking claw 16 that holds the optical connector plug 41 at the fitting position.

In order to make the optical receptacle 10 of the present embodiment function to connect the optical transmission components to each other, as shown in FIG. 7, the optical connector plug 41 is connected to the optical receptacle 10. The optical fiber 33 attached to the first ferrule 31 and the optical fiber 43 attached to the second ferrule 42 can be connected by inserting from the left side of FIG. At this time, the second ferrule 42 is aligned with the first ferrule 31 by fitting into the split sleeve 20 attached to the sleeve 19 of the housing 11, and the split sleeve 20 and the ferrule 31 float from the housing 11. Therefore, it is not necessary to precisely position the ferrule 31 with respect to the housing 11.

Further, the first ferrule 32 is held so as not to rotate in the circumferential direction by the engagement of the sleeve body 32 with the locking groove 14, so that the free rotation of the first ferrule 32 can be prevented. The eccentric direction of the core of the optical fiber 33 can be adjusted, and the connection loss can be minimized. In this case, the assembly work by the automatic assembly machine can be easily performed. In this example,
The locking groove 14 is formed on the inner peripheral surface of the mounting portion 12 of the housing 11, while the outer peripheral surface of the main body 32 of the first ferrule 31 is knurled so as to engage with the locking groove 14. The main body 32 of the ferrule 31 may be formed in a rectangular shape and non-rotatably fitted to the mounting portion 12 of the housing 11.

[0023]

As described above in detail with reference to the embodiments, according to the optical receptacle of the present invention, the first ferrule is mounted from the base end side of the cylindrical housing, and the first ferrule is provided inside. Is fitted and a second ferrule of the optical connector plug which is connected to the distal end side of the housing is fitted and a sleeve for aligning the two is provided, and the first ferrule is attached to the base end of the housing. While the first locking portion for holding is formed, the fitting portion for fitting the optical connector plug and the second locking portion for holding the optical connector plug at the fitting position are formed at the tip end portion. The structure can be simplified and the size and weight of the device itself can be reduced without impairing the sufficient function of the device.

According to the optical receptacle of the present invention,
Since the housing has the third locking portion that prevents the first ferrule fitted to the base end side from rotating in the circumferential direction, the first ferrule can be held at the optimum mounting position.
By adjusting the eccentric direction of the optical transmission component to be connected, it is possible to reduce and reduce the connection loss.

According to the optical receptacle of the present invention,
Since the sleeve, the first locking portion, and the second locking portion are integrally molded in the housing, they can be formed by one set of molding dies, and the cost can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view (cross-section I-I of FIG. 3) of an optical receptacle according to an embodiment of the present invention.

FIG. 2 is a cross section of the optical receptacle (II-II cross section of FIG. 3).
It is a figure.

FIG. 3 is a left side view of the optical receptacle.

FIG. 4 is a right side view of the optical receptacle.

FIG. 5 is a vertical sectional view of a housing.

FIG. 6 is a cross-sectional view of the housing.

FIG. 7 is a schematic diagram illustrating a usage pattern of the optical receptacle of the present embodiment.

FIG. 8 is a schematic view of a conventional SC type optical receptacle.

FIG. 9 is a schematic view of a conventional SC type optical connector.

[Explanation of symbols]

 Reference Signs List 10 SC type optical receptacle 11 Housing 13 Locking claw (first locking part) 14 Locking groove (third locking part) 15 Fitting part 16 Locking claw (second locking part) 19 Sleeve 20 Split sleeve 31 First ferrule 32 Ferrule body 33 First optical fiber 41 Optical connector plug 42 Second ferrule 43 Second optical fiber

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiaki Takeuchi 1-6, Uchiyuki-cho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Masaru Kobayashi 1-6-1, Uchiyuki-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Iwa Kitazawa 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation (72) Inventor Shunichi Higashino 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Koji Sato 1-1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (3)

[Claims] 1. An optical receptacle attached to one optical transmission component for connecting optical transmission components to each other, wherein a first ferrule is mounted from a base end side of a cylindrical housing, and the first ferrule is internally provided. A housing is provided in which a first ferrule is fitted and a second ferrule of an optical connector plug connected to the tip end side of the housing is fitted to align the first and second ferrules, and the housing is provided. A first engaging portion for holding the first ferrule is formed at the base end portion of the housing, and a fitting portion for fitting the optical connector plug and the optical connector plug are fitted at the distal end portion of the housing. An optical receptacle characterized in that a second locking portion for holding the position is formed. 2. The optical receptacle according to claim 1, wherein the housing is provided with a third locking portion for circumferentially immobilizing the first ferrule fitted to the base end side of the housing. Characteristic optical receptacle. 3. The optical receptacle according to claim 1 or 2, wherein the sleeve, the first locking portion and the second locking portion are integrally molded in the housing.