JP4186881B2 - Holding structure for movable optical fiber storage - Google Patents

Description

  The present invention relates to a holding structure for a storage section that stores an extra length portion of an optical fiber core line such as an optical amplifier that transmits an optical signal through an optical fiber in a transmission path of a CATV system that transmits video, audio, and data.

  In recent years, in CATV systems, an increasing number of systems use optical signals for transmission lines in order to increase capacity, increase long-distance transmission, and improve transmission quality.

  An optical fiber cable is used for the transmission path, and devices such as an optical amplifier, an optical distributor, and an optical branching unit are used to transmit an optical signal.

  In these devices, the optical fiber core wire from the optical connector is fused to the optical fiber core wire of the optical cable, and a signal is transmitted through the optical connector provided in the device.

  Since the optical fiber core wire is made of thin special glass or thin plastic, it is weak in strength and easily broken. For this reason, in the fusion splicing of the optical fiber core wire, since it is connected with a margin in length so that it can be cut and reconnected if it breaks, this extra length is simply housed in the optical device Space is required.

  In addition, because the optical fiber core wire is made of the same thin special glass or thin plastic, signal quality deteriorates when bent at a radius smaller than the predetermined bending radius, so handling with extreme care is required. Is done.

  FIG. 1, FIG. 2, FIG. 3, and FIG. 4 show structural examples of conventional optical fiber storage units.

  DESCRIPTION OF SYMBOLS 1 is an optical fiber storage case, 2 is a rotation arm part, 3 is a rotation support part which supports a rotation arm part, 6 is a housing | casing of optical equipment, 7 is an adjustment part, such as a frequency characteristic, 8 is an optical fiber, 9 is 2nd The holding position 10 is a frictional force adding portion.

FIG. 1 shows an example of a fixed optical fiber storage unit. FIGS. 2 and 3 show that the optical fiber storage unit is once separated from the housing of the optical device by releasing the fixing mechanism from the first holding position. FIG. 4 shows an example of a movable optical fiber storage unit that is moved to the holding position and fixed again. FIG. 4 shows the optical fiber storage unit that rotates the optical fiber storage unit from the first holding position and uses the frictional force of the rotation support unit 3. It is another example of the movable optical fiber storage part which holds a part in the position away from adjustment parts, such as a frequency characteristic.
JP 2002-243950 A

  However, in the structure of the fixed optical fiber storage unit shown in FIG. 1, the adjustment unit for frequency characteristics and the like needs to be arranged in a place away from the optical fiber storage unit, that is, it requires a space that is the sum of the two. It had the problem that it would hinder downsizing of the body.

  2 and 3, when the optical fiber storage unit is moved from the first holding position to the second holding position, the optical fiber is temporarily stored from the housing of the optical device. In order to separate the parts, there is a problem that if the operator accidentally removes his / her hand, the optical fiber storage part falls and damages the optical fiber core wire.

  Further, in the structure of the conventional movable optical fiber storage portion shown in FIG. 4, the rotation support portion 3 may not be able to support the rotation arm portion 2 due to a decrease or variation in the frictional force of the rotation support portion, and the optical fiber storage case is lowered. The worker has to hold the optical fiber storage unit with one hand and has a problem that it hinders the construction work under unstable conditions at the construction site.

  The present invention solves the above-mentioned conventional problems, can move the optical fiber storage case without damaging the optical fiber, and securely holds the optical fiber storage case in the second holding position, and holds it with an easy operation. An object of the present invention is to reduce the size of the casing by providing a structure for releasing the position and returning it to the first holding position.

In order to solve the above problems, an optical device of the present invention includes an optical fiber storage unit that winds and stores an extra length portion of an optical fiber core wire, a guide hole having a combined shape of a circular shape and an oval shape, a holding unit, An optical device comprising a second holding unit and a rotation stop unit, wherein the optical fiber storage unit is located outside the housing from a first holding position for storing the optical fiber storage unit in the housing of the optical device. and oval-shaped rotating shaft to rotate, and a projection for holding the projection for holding and the second on the pivot point side, the rotation shaft and the guide hole is fitted in the circular portion of the guide hole, The second holding position where the rotating shaft rotates from the first holding position until it contacts the rotation stop portion around the rotation axis, and the rotation shaft slides from the circular portion of the guide hole to the oval portion and stops. Is fixed, and the rotation axis of the guide hole is fixed. The second holding position is obtained by locking the holding portion and the holding projection, and the second holding portion and the second holding projection provided at the same angle as the direction of sliding to the circular portion. It is fixed by.

  With this configuration, the optical fiber storage case can be moved without damaging the optical fiber, and the optical fiber storage case is securely held at the second holding position, and the holding is released by an easy operation and returned to the first holding position. By providing the structure, the housing can be downsized.

  The movable optical fiber storage portion of the present invention is held by rotating the optical fiber storage case with the rotation support portion as a fulcrum and bringing the holding projection provided on the movable portion side into contact with the holding portion provided on the fixed portion side. And has the effect that the limited space of the housing can be shared by the optical fiber storage unit and the frequency characteristic adjusting unit.

(Embodiment 1)
An embodiment of the present invention will be described with reference to FIGS.

  FIG. 5 is a front view of the holding structure for the movable optical fiber storage portion according to Embodiment 1 of the present invention. FIG. 6 is a side view of the movable optical fiber storage unit according to Embodiment 1 of the present invention.

  In FIG. 5, 1 is an optical fiber storage case, 2 is a rotating arm part, 3 is a rotation support part that supports the rotating arm part, 4 is a holding projection, 5 is a holding part, 6 is a housing of an optical device, and 7 is a frequency characteristic. And the like, 8 is an optical fiber, and 9 is an optical fiber storage case 1 in the second holding position.

  The operation will be described below.

  The optical fiber housing case 1 is provided with a rotating arm portion 2 and a holding projection 4 and rotated around the rotation support portion 3 to bend the movable holding projection 4 or the fixed holding portion 5 to hold the holding projection 4. Can be placed on the holding portion 5 to place the optical fiber storage case in the second holding position.

  Similarly, the holding state can be released by bending the movable holding protrusion 4 or the fixed holding portion 5 to return the optical fiber storage case to the first holding position.

  The material of the holding portion 5 or the holding projection 4 may be anything as long as it can be bent, such as a synthetic resin or a spring. Moreover, although the case where either the holding | maintenance part 5 or the protrusion 4 for holding bends was illustrated in this Embodiment 1, both may be bent.

  According to the present invention, the housing can be reduced in size, the optical fiber can be accommodated easily, and the protection of the optical fiber core can be realized when adjusting the frequency characteristics.

(Embodiment 2)
Another embodiment of the present invention will be described with reference to FIGS.

  FIG. 8 is a cross-sectional view of the rotation support portion that supports the rotation arm portion according to the second embodiment of the present invention. FIG. 9 is a side view of the optical fiber storage case in the second embodiment of the present invention. FIG. 10 is a side view when the optical fiber storage case according to Embodiment 2 of the present invention is in the first holding position. FIG. 11 is a detailed view of the rotating shaft when the optical fiber storage case according to Embodiment 2 of the present invention is in the first holding position. FIG. 12 is a side view when the optical fiber storage case in Embodiment 2 of the present invention contacts the rotation stop portion. FIG. 13 is a detailed view of the rotation shaft portion when the optical fiber storage case according to Embodiment 2 of the present invention contacts the rotation stop portion. FIG. 14 is a side view when the optical fiber storage case according to Embodiment 2 of the present invention is in the second holding position. FIG. 15 is a detailed view of the rotating shaft portion when the optical fiber storage case according to Embodiment 2 of the present invention is in the second holding portion.

  In FIG. 8, 3 is a rotation support part for supporting the rotating arm part, 5 is a holding part, 11 is a guide hole of the rotating shaft, and 14 is a second holding part.

  In FIG. 9, 1 is an optical fiber storage case, 2 is a rotating arm, 4 is a holding projection, 12 is a second holding projection, and 13 is an oval rotating shaft.

  In FIG. 10, 1 is an optical fiber storage case, 3 is a rotation support unit that supports the rotating arm unit, 6 is a housing of an optical device, and 7 is an adjustment unit for frequency characteristics and the like. In FIG. 11, 11 is a guide hole of a rotating shaft, 15 is a rotation stop part. In FIG. 13, reference numeral 14 denotes a second holding unit. In FIG. 15, reference numeral 4 denotes a holding projection, and 5 denotes a holding portion.

  The operation will be described below.

  As shown in FIG. 9, the optical fiber housing case 1 is provided with a rotating arm portion 2, a holding projection 4, and a second holding projection 12, and is rotated around the rotation support portion 3 shown in FIG. As shown in FIG. 12, the optical fiber storage case 1 rotates around the rotation shaft 13, and the rotating arm portion 2 comes into contact with the rotation stop portion 15 on the fixed side to stop the rotation operation. As shown in FIGS. 14 and 15, the oval rotating shaft 13 slides to the second holding position along the guide hole 11 of the rotating shaft at the position where the rotation operation is stopped. The guide hole 11 has a combined shape of a circle and an ellipse so that the fitted rotation shaft 13 can be rotated, slid and fixed.

  In the second embodiment, as shown in FIG. 15, the holding projection 4, the holding portion 5, and the second holding portion 14 are at the same angle as the direction in which the oval rotating shaft 13 slides in the guide hole 11. And the second holding projection 12 are provided so that the guide hole oval portion of the rotating shaft slides with each other along the slide, so that the rotating shaft 13 is held when the optical fiber storage case 1 is held. The applied force can be dispersed to increase the durability of the rotating shaft 13.

  In the second embodiment, in order to increase the durability of the rotating shaft 13, the holding projection 4 and the holding portion 5, and the second holding portion 14 and the second holding projection 12 are provided. It is also possible to eliminate these by forming 13 with a highly durable metal or the like.

  Further, in the second embodiment, the rotation shaft 13 is provided on the optical fiber storage case 1 side, and the guide hole 11 is provided on the rotation support portion 3 of the housing 6 of the optical device. However, the guide is provided on the optical fiber storage case 1 side. It is good also as a structure which provides the hole 11 and provides the rotating shaft 13 in the rotation support part 3 of the housing | casing 6 of an optical device.

  As described above, the present invention provides a holding protrusion on the optical fiber case side and a holding part on the fixed side in the optical fiber storage case for storing the extra length portion of the optical fiber core for signal transmission in the optical amplifier for CATV transmission path, By rotating and moving the optical fiber storage case and holding it at the second holding position, an excellent effect that adjustment work such as frequency characteristics can be performed in a limited space of the housing can be obtained.

Internal front view of conventional fixed optical fiber storage Internal front view of a conventional movable optical fiber storage Internal side view of a conventional movable optical fiber storage Internal front view of a conventional movable optical fiber storage The front view of the optical equipment in Embodiment 1 of this invention 1 is a side view of an optical device according to Embodiment 1 of the present invention. Detailed view of holding structure of optical device in Embodiment 1 of the present invention Sectional view of the rotation support portion of the optical device in Embodiment 2 of the present invention Optical fiber storage case side view of the optical apparatus in Embodiment 2 of this invention The side view when the optical fiber storage case of the optical equipment in Embodiment 2 of this invention exists in a 1st holding | maintenance part Detailed view of rotating shaft when optical fiber storage case of optical device in embodiment 2 of present invention is in first holding portion The side view when the optical fiber storage case of the optical equipment in Embodiment 2 of this invention contact | abuts to a rotation stop part Detailed view of the rotating shaft when the optical fiber storage case of the optical device in Embodiment 2 of the present invention abuts against the rotation stopping portion The side view when the optical fiber storage case of the optical equipment in Embodiment 2 of this invention exists in a 2nd holding | maintenance part Detailed view of rotating shaft when optical fiber storage case of optical device in second embodiment of present invention is in second holding portion

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical fiber storage case 2 Rotating arm part 3 Rotation support part which supports a rotating arm part 4 Holding protrusion 5 Holding part 6 Case of optical equipment 7 Adjustment part of frequency characteristics etc. 8 Optical fiber 9 2nd holding position 10 Addition of frictional force Portion 11 Rotating shaft guide hole 12 Second holding projection 13 Oval rotating shaft 14 Second holding portion 15 Rotation stop portion

Claims (1)

An optical fiber storage unit that wraps and stores an extra length portion of the optical fiber core wire, a guide hole having a combined shape of a circular shape and an oval shape, a holding unit, a second holding unit, and a rotation stopping unit. a light device, the optical fiber accommodating portion has a oval-shaped rotating shaft for rotating the first holding position outside the housing for storing the optical fiber accommodating portion in a housing of the optical device, the pivot point A holding protrusion and a second holding protrusion on the side, and the rotation shaft and the guide hole are fitted in a circular portion of the guide hole, and the rotation shaft is centered on the rotation shaft from the first holding position. The rotating shaft rotates until it comes into contact with the rotation stopping portion, and the rotating shaft is fixed at a second holding position where the rotating shaft slides from the circular portion of the guide hole to the oval portion and stops, and the rotating shaft is fixed to the length of the guide hole. Set at the same angle as the sliding direction to the circular part. The optical device is fixed at the second holding position by locking the held holding portion and the holding projection, and the second holding portion and the second holding projection. .

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