JP2004317863A - Female plug for optical connector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a female plug for an optical connector having an adapter unit which is very easily attached and detached in a short time and does not necessarily require a tool for attaching and detaching operations. <P>SOLUTION: The right hand side tip part of an adapter shaft 224 is properly engaged with bayonet lock grooves of a hook bolt 226. When the bayonet lock is released, a spring 227 presses the other tip part B toward the left direction in the figure to provide a push out function. When the part B is projected during the releasing operation of the bayonet lock, an O ring 225 is also pushed out to provide a nonslip function so that the whole body of an adapter unit U is easily pulled out by finger tips. A similar nonslip function is also observed for the spring 227. Since the unit U is simply separated by finger tips in a short time, a ferrule 217 is widely exposed in the opening direction of a female plug shell and the end face of the tip part of the ferrule 217 is very easily cleaned. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a female plug of an optical connector having a detachable adapter unit provided with a holding member such as a split sleeve for holding a ferrule in a state in which the end surfaces of the tip face each other and are in contact with each other.
[0002]
[Prior art]
[Patent Document 1]
Japanese Utility Model Publication No. 6-2306
[Patent Document 2]
Japanese Utility Model Laid-Open No. 6-4711
[0003]
As a known prior art related to a female plug of an optical connector having a detachable adapter unit provided with a holding member such as a split sleeve for holding the end faces of the two ferrules in a state of being opposed and in contact with each other, for example, There are those described in Patent Document 1 and Patent Document 2 described above.
For example, the optical connector described in Patent Document 1 above has a detachable adapter unit having a split sleeve. If the end face of the tip of the ferrule on the female plug side is dirty, The adapter unit can be removed from the female plug, and the dirt can be wiped off using a cotton swab or the like.
[0004]
FIG. 8 is a cross-sectional view and a side view of a female plug 10 of a conventional optical connector that is the same type as the optical connector described in the above-mentioned Patent Document 1 and is now in widespread use. Correspond to the meanings of the respective symbols in FIG. 2 described in Patent Document 1 described above. However, reference numeral 18a indicates a female screw portion formed around the central axis of the latch metal 18.
Hereinafter, in each drawing of this specification, the direction in which the opening of the shell of the male plug to be fitted with the female plug faces is defined as the positive direction of the x-axis. Assume a match.
[0005]
In the conventional female plug 10 shown in FIG. 8, the tip of the adapter pin 20 is a male screw, and is screwed with the female screw portion 18a. The adapter pin 20 is released by loosening and unscrewing this screw using a flathead screwdriver. The adapter 19 that holds the split sleeve 22 inclusively can also be detached from the small diameter portion 13 of the shell 11 of the female plug 10 together with the adapter pin 20 by this operation.
[0006]
[Problems to be solved by the invention]
However, in the female plug 10 of the conventional optical connector shown in FIG. 8, when the adapter 19 is removed, the adapter pin 20 must be rotated 7 to 8 times in order to loosen the screwing. It is troublesome to remove 19 because it takes a lot of outside space.
Furthermore, since the operation requires tools such as a screwdriver, in an emergency such as when using an optical connector, the end face of the tip of the ferrule cannot be cleaned without tools close to the operator. Is inconvenient.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to realize a female plug of an optical connector having an adapter unit that can be attached and detached very easily and in a short time. A further object of the present invention is to provide a female plug of an optical connector with a mounting / removing mechanism that does not require a tool for mounting / detaching an adapter unit.
However, it is sufficient if each of the above-mentioned objects is achieved individually by at least one of the individual means of the present invention, and the individual invention of the present application solves all the above-mentioned problems simultaneously. It does not necessarily guarantee that a solution exists.
[0008]
Means for Solving the Problems, Functions and Effects of the Invention
In order to solve the above-mentioned problems, the following means are effective.
That is, a first means of the present invention is a female plug of an optical connector having a detachable adapter unit having a holding member for holding the end surface of the ferrule facing and in contact with the end surface of the ferrule. Using a bayonet lock.
[0009]
FIG. 1 is a perspective view exemplarily illustrating the operation principle of a known bayonet lock. For example, if such a bayonet lock is used, it is usually possible or easy to release or fasten the lock simply by rotating about a right angle (90 °).
[0010]
More generally, the number of engagement pins (projections 224a ') to be provided on the male side (224') of the lock structure may be more than one. The rotation operation angle at the time of opening and closing the lock is determined by the shape of the bayonet lock groove H 'provided on the female side (226') of the lock structure. Considering ease of use and ease of manufacture of the bayonet lock, for example, when two engaging pins (convex portions 224a ') are provided on the male side (224') of the lock structure, the rotation at the time of opening and closing the lock is required. The dynamic operation angle is desirably about 60 ° to 120 °. When only one engaging pin is provided, for example, as shown in FIG. 1, the turning operation angle at the time of opening and closing the lock is desirably about 60 ° to 180 °.
[0011]
Therefore, according to the present invention, in any case, the lock can be released or fastened only by a rotation operation within at most two right angles. Also, if a bayonet lock is used, a reliable fastening effect can be obtained without firmly screwing both the male and female of the lock structure. Therefore, according to the above configuration, the operation of engaging and releasing the lock can be easily performed.
[0012]
That is, according to the present invention, in a female plug of an optical connector having a detachable adapter unit, if the attaching / detaching mechanism of the adapter unit is configured using a bayonet lock, the adapter unit can be detached very easily and in a short time. Can be realized.
Further, according to the above configuration, it is possible or easy to configure the attaching / detaching mechanism so that no tool is required for attaching / detaching the adapter unit.
Hereinafter, means for constituting a more desirable embodiment of the present invention will be described more specifically.
[0013]
That is, a second means of the present invention is that, in the first means, the female plug is held in a substantially cylindrical female plug shell.
Although the present invention does not need to be provided with a substantially cylindrical female plug shell that internally holds the female plug, the above-mentioned effects are of course greatly exerted, but the connection between the female plug and the male plug is ensured. In order to maintain the end face of the ferrule as clean as possible, to sufficiently protect the optical connector from external force, and to ensure a sufficient waterproof action on the connectors, More preferably, the female plug is housed in a female plug shell. That is, the present invention synergistically provides a larger action and effect (added value) in a more reliable optical connector configured using such means.
[0014]
Further, a third means of the present invention is the shaft according to the first or second means, which transmits a rotating operation for opening and closing the bayonet lock (hereinafter referred to as an “adapter shaft” or the like). Is provided in the adapter unit.
According to such a configuration, when the adapter unit is detached, the shaft for transmitting the turning operation for opening and closing the bayonet lock is also detached at the same time, so that when cleaning the end face of the tip of the ferrule, Such a shaft is very convenient without being in the way.
[0015]
According to a fourth aspect of the present invention, in the above-mentioned third aspect, the end of the shaft A located on the side opposite to the male plug can be fitted to the body of the female plug from which the adapter unit has been detached. A hook bolt provided with a bayonet lock groove is provided.
A hook bolt provided with such a bayonet lock groove (for example, FIG. 5) embodies the female thread structure of the bayonet lock. Of course, the end A of the shaft uses such a hook bolt. May be formed. However, the female screw structure of the bayonet lock is more easily designed to be attached to the main body of the female plug than to the adapter unit, so that the main body of the female plug can be easily assembled. This is because the hook bolt literally has the function of a bolt as clearly illustrated in the embodiments (FIGS. 3, 4, and 5) described later.
[0016]
Further, the fifth means is such that in the above-mentioned fourth means, two projections which are substantially perpendicular to the shaft are provided at the end A, and at least a part of the engagement groove to be engaged with the flathead screwdriver is provided. A part of the bayonet lock groove is formed on the hook bolt.
For example, a hook bolt as illustrated in an embodiment (FIG. 5) described later is provided with such an engagement groove, so that a minus screwdriver can be used for fastening the hook bolt. Since it becomes possible or easy, the main body side of the female plug can be structured to be easy to assemble.
[0017]
A sixth means is that, in any one of the third to fifth means described above, the end B located on the male plug side of the shaft is disposed substantially at the center of the substantially distal end of the female plug. If the adapter unit is disposed substantially at the end of the female plug, the attachment / detachment operation of the adapter unit becomes easy. In addition, if it is arranged substantially at the center, when the end B is pressed when the bayonet lock is released or fastened, the force is easily directed to the center of gravity of the female plug, so that operational stability can be ensured. it can.
[0018]
In particular, when manufacturing a female plug having a structure in which the female plug is internally held by the female plug shell, the adapter unit is usually arranged at a position slightly recessed from the opening of the female plug shell. This is to sufficiently protect the adapter unit with the female plug shell. In such a case, the end B located on the male plug side of the shaft is disposed substantially at the center of the substantially distal end of the female plug. For example, when attaching or detaching the adapter unit, it is convenient to insert a finger into a position slightly behind the opening of the female plug and push, pinch, or turn the end B with a finger or the like.
[0019]
Further, the seventh means is that, in any one of the third to sixth means, the end portion B located on the male plug side of the shaft is extended by releasing the bayonet lock to release the female plug. A spring is provided for pushing the adapter unit substantially in front of the distal end, and the adapter unit is detached from the female plug by pulling the end portion B pushed by the spring in the same direction in front of the approximate end of the female plug.
[0020]
When the adapter unit is pulled out after the bayonet lock is released, if the adapter unit has a built-in shaft, by pulling the end B, the adapter unit can be detached together with the adapter shaft. Therefore, if the end B jumps forward when the end B is pulled, the end B can be easily held immediately and the adapter unit can be detached very easily, which is very convenient.
Also, since a spring portion can be provided, this is convenient when the adapter unit is pulled out.
[0021]
An eighth means is the device according to any one of the third to seventh means, wherein a bayonet lock is opened / closed or an adapter unit is taken out near an end B located on the male plug side of the shaft. Is to provide a fingertip operation section for this.
Such a fingertip operating section is for making the operation of the end B with the fingertip easier, and is preferably configured according to, for example, the following means.
[0022]
That is, a ninth means is that, in the above-mentioned eighth means, an O-ring, a cap, or a knob formed using a rubber-based or resin-based material is provided on the fingertip operation unit.
According to such a configuration, when pushing or turning or pushing around the end B with the fingertip, the finger is hard to slip, the end B is easily held, and the finger is hurt even if the end B is operated many times. Advantages such as being difficult to obtain are obtained.
[0023]
According to a tenth aspect, in the above-mentioned eighth or ninth aspect, the fingertip operating section is provided with a substantially butterfly-shaped head which can be easily or easily tightened or loosened only with the force of a finger. It is.
[0024]
However, the butterfly shape referred to here is, for example, a well-known so-called wing nut or the head of a wing screw as illustrated in FIG. It is the shape of the head that can be easily inserted.
For example, according to such a configuration, the above-mentioned fingertip operation section can be formed in a shape with higher operability.
[0025]
An eleventh means is the first means according to any one of the first to tenth means, wherein the male-side convex portion of the bayonet lock is guided in the center axis direction along the attaching / detaching direction of the attaching / detaching mechanism. A lock groove to be formed on the female side of the bayonet lock is formed from the guide groove and the second guide groove that guides the male convex portion in the rotation direction about the center axis, and an end of the second guide groove. The provision of a substantially cylindrical round groove in which the axis is substantially perpendicular to the central axis.
[0026]
Such a round groove portion is suitable for improving the fit of the convex portion on the male side of the lock, and works well in stably maintaining the locked state of the lock. In particular, when a spring is provided to push the above-mentioned end portion B substantially forward of the distal end of the female plug, the male side of the lock is urged by the elastic force of the spring. It is pressed by the round groove. Therefore, unless a force in the direction of contracting the spring is applied to the spring by an unlocking operation or the like, the male convex portion of the lock does not come off the position.
By the means of the present invention described above, the above problems can be effectively or rationally solved.
[0027]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described based on specific examples. However, the present invention is not limited to the embodiments described below.
〔Example〕
FIG. 2 is a cross-sectional view and a side view when the male plug 300 and the female plug 200 of the present embodiment are connected. In this cable connector, three components, namely, a substantially cylindrical male plug shell 301, a substantially cylindrical female plug shell 202, and a substantially cylindrical slide cover 215 are mainly exposed to the outside.
[0028]
The slide cover 215 internally holds a substantially cylindrical slide sleeve 203 and is fixed on the female plug shell 202 so as to be slidable in the x-axis direction.
The central axis of each of the above substantially cylindrical parts coincides with the x-axis. Let x = 0 be the x coordinate at the standard position of the contact surface of the two ferrules 217 on the left and right. At this time, as shown in FIG. 2, the pin 206 is located on the xz plane. Hereinafter, the rotation angle about the x-axis is defined as θ. The rotation angle θ is measured on the basis of the positive direction on the z-axis as a reference (θ = 0), the rotation direction from θ = 0 toward the positive direction of the y-axis is θ> 0, and The direction of the rotation is θ <0.
For example, the opening 215a of the slide cover 215 faces the negative direction of the x-axis, and the caulking portion 210 of the slide cover 215 located on the opposite side faces the positive direction of the x-axis.
[0029]
FIG. 3 is a sectional view of the female plug 200. However, in FIG. 3, the portion above the x-axis represented by the center line is a cross-sectional view of a section where θ = 0 °, and the portion above the x-axis is θ = 60 ° It is sectional drawing of the cross section which becomes. The detailed shape of the hook bolt 226 is described in FIGS.
The coil spring 213 is sandwiched between the coil spring contact wall 202a of the female plug shell 202 and the edge of the large ring of the slide sleeve 203, and is held inside the slide cover 215 so as to be able to expand and contract. The sliding movement of the slide cover 215 is restricted by the contact between the coil spring 213 or the slide sleeve 203 and the coil spring contact wall 202a with respect to the positive direction of x, and by the caulking portion with respect to the negative direction of x. 210. The caulking portion 210 is formed by caulking the substantially ring-shaped end 215b on the bottom side of the slide cover 215 opposite to the opening of the slide cover 215 itself.
[0030]
The pin 205 forms a protrusion that engages with the groove 203b of the slide sleeve 203. The steel ball engaging groove 211 on the female plug shell 202 is engaged with a steel ball (not shown) near the opening of the male plug shell 301. The steel ball engaging groove 211 has a contact portion 211a that comes into contact with the steel ball. The contact portion 211a formed on the female plug shell 202 is for restraining the steel ball from moving in the negative x-axis direction.
[0031]
The first contact portion on the female plug 200 side includes the insulator 207, the insulator 208, the insulator 209, and components held inside the insulator. The insulator 207, the insulator 208, and the insulator 209 have an engaging portion (not shown) that restricts relative rotation about the x-axis. The split sleeve 220 is held by a split sleeve holder 221 and a split sleeve holder 222. In the split sleeve 220, the ferrule 317 and the ferrule 217 of the second contact portion on the male plug 300 side shown in FIG. As shown in the drawing, the end faces come into surface contact with each other.
Other reference numerals 223, 224, 225, and 226 indicate a TM clamp, an adapter shaft, an O-ring, and a hook bolt, respectively.
[0032]
4A is a cross-sectional view of the insulator 209, and FIG. 4B is a cross-sectional view of the pressing mechanism M for pressing the insulator 209 to fix the insulator 209 on the same cross section. The approximate shape of the insulator 209 is formed by arranging seven cylindrical holes in a substantially honeycomb shape so that the axial direction coincides with the x-axis direction with respect to the hollow cylindrical shape. The approximate shape of the insulator 208 is formed by arranging seven circular holes in a substantially honeycomb shape on the bottom surface of a hollow cylindrical shape having an empty inside. Reference numeral 208c indicates a side wall of a hole formed in the bottom surface of the substantially trough-shaped cylindrical shape. Reference numeral 208b indicates the circular edge of the upper portion of the substantially trough-shaped cylindrical shape. Reference numeral 208a denotes a protrusion projecting from the edge 208b and engaging with the TM clamp 223.
[0033]
The base of the TM clamp 223 is formed of a substantially cylindrical pipe 223a. A female screw portion 223b is formed on the inner wall at the tip of the pipe 223a, and the hook bolt 226 is fixed by screwing the male screw portion 226a of itself and the female screw portion 223b formed on the pipe 223a. You.
Further, the TM clamp 223 is pressed via a buffer member by screwing a not-shown end fastening member screwed into a not-shown female screw cut into a slightly larger inner wall of the female plug shell 202 on the right side in FIG. It is fixed by being done.
[0034]
FIG. 5 is a front view (a), a side view (b), and cross-sectional views (c) and (d) of each section of the hook bolt 226. Points p1 and p2 in the figure indicate the same position (point) on the hook bolt 226, respectively. Symbol H indicates a bayonet lock groove, and symbol h indicates an engagement groove to be engaged with a flathead screwdriver. The portions shown in FIGS. 5C and 5D of the engagement groove h are formed by expanding the bayonet lock groove H to the tip side of the bolt in which the male screw portion is formed. As described above, the bayonet lock groove H has a first guide groove (FIG. 5A) that guides the engagement pin 224a on the male side of the lock along the x-axis and a rotation direction about the x-axis. Guide grooves (FIGS. 5 (b) and 5 (d)) and a substantially cylindrical round groove portion K (see FIG. 5 (b) and (d)) for stably maintaining the locked state at the end near the rotation end point. 5 (b) and 5 (d)). Points p1 and p2 in the figure respectively correspond to the end points of the round groove K in the above-described rotation direction.
[0035]
By forming the hook bolt 226 in such a shape, it is possible to manufacture the hook bolt 226 having the bayonet lock groove H that fits well with the end A of the adapter shaft 224 in FIG. 6B.
[0036]
FIG. 6 is a front view (a) of the adapter unit U of the present embodiment and a cross-sectional view (b) on a cross-section including the x-axis. The insulator 207 constitutes a housing of the adapter unit U, and has a total of seven substantially cylindrical holes 207a arranged in a substantially honeycomb shape. The split sleeve 220 shown in FIG. 6, which holds the ferrules 217 and 317 in FIG. You.
[0037]
Annular recesses 207b are formed on the inner wall near the opening located on the side of the end A of the upper and lower two holes 207a. The concave portion 207b is formed so as to just fit with the convex portion 222a of the split sleeve holder 222, which has a substantially arrow-shaped cross section and is press-fit by pressing the split sleeve holder 222 from the opening. Thereby, the concave portion 207b of the insulator 207 and the convex portion 222a of the split sleeve holder 222 are favorably inserted and fixed. According to such a configuration, it is not necessary to use an adhesive to fix the split sleeve holder 222, or to form a complicated and low-productivity screw-in structure, and the two upper and lower holes 207a are not required. The split sleeve 220 can be fixed easily and securely in a short time. Therefore, even with such a structure, the productivity of the female plug 200 is improved.
[0038]
In addition, a small step portion 207c having a step of less than 1 mm is formed on the substantially cylindrical outer wall of the insulator 207. This is because the diameter of the substantially cylindrical shape of the insulator 207 when the split sleeve holder 222 is inserted and fixed is slightly increased in the vertical direction in FIG. This is provided in order to make the diameter of the thinner. This offsets the increase or decrease in the outer dimensions of the insulator 207, so that there is no risk that assembly of the insulator 207 will be hindered. Further, as a material of the split sleeve holder 222, a material such as a metal having higher hardness or rigidity than the insulator 207 is desirable.
[0039]
The structure related to the press-fitting and the insertion and fixing of the split sleeve holder 222, the concave portion 207b, and the step portion 207c is also applicable to a more general adapter unit in a female plug of an optical connector having no bayonet lock. Of course, this is a very effective structure. That is, the structure related to the press-fitting and the insertion and fixing of the split sleeve holder 222 can be a very useful structure even for a general adapter unit that does not satisfy the requirements of claim 1 of the present invention. Such a structure is a new one that can be recognized independently of the bayonet lock mechanism.
[0040]
The adapter shaft 224 is inserted into the central hole 207a of the insulator 207, and other electrical wiring-related contacts are inserted into the other four holes 207a. At the end portion B of the adapter shaft 224 arranged on the male plug 300 (FIG. 2) side, an operation portion that can be turned by a finger or directly by a finger is formed. On the other hand, the end A of the adapter shaft 224 is provided with an engagement pin 224a that forms two projections that satisfactorily engage with the bayonet lock groove H of the hook bolt 226 in FIG.
[0041]
The spring 227 has a function of urging and pushing the end B in the negative direction of the x axis when the bayonet lock is released, and the engagement pin 224a in the negative direction of the x axis when the bayonet lock is fastened. By urging and pressing against the bayonet lock groove H of the hook bolt 226 in FIG. 4, the function of securely fitting the two is achieved.
The O-ring 225 also has a slip-preventing function to facilitate pulling out the entire adapter unit U with a fingertip when the end portion B is pushed out when the bayonet lock is released. Such an anti-slip function is also found in the spring 227. That is, the O-ring 225, the spring 227, and the like also constitute the fingertip operation unit of the present invention for facilitating the removal of the adapter unit.
[0042]
FIG. 7 shows a sectional view and a side view of the female plug 200 of the optical connector from which the adapter unit U has been detached. As can be seen from FIG. 7, the operation of the O-ring 225 and the spring 227 constituting the fingertip operation section makes the adapter unit U easier to hold with the fingertip than when the adapter unit U is taken out. Have been.
The convex portion 207d of the insulator 207 is formed for correctly engaging the adapter unit U with the insulator 209 at a predetermined angle, and the convex portion 207d is formed on the insulator 209 side. Guide grooves for guiding are provided at corresponding predetermined angles.
[0043]
According to the above embodiment of the present invention, by detaching the adapter unit U with only a fingertip simply and in a short time as illustrated in FIG. 7, the ferrule 217 located at the connection portion of the optical fiber cable 230 becomes a female. The above-described embodiment is very convenient when cleaning the end face of the end of the ferrule 217 because it is widely exposed to the opening of the plug shell 202.
[0044]
[Other modifications]
FIG. 9 is a perspective view of a well-known representative wing nut (a) and a wing screw (b). Generally, such a nut or screw head shape is called a butterfly shape. When the shape of the tip of the end portion B of the adapter shaft 224 in the above embodiment is butterfly-shaped, the adapter shaft 224 can be more easily rotated directly with only a fingertip. When a substantially butterfly-shaped head is provided at the end B of the adapter shaft 224, an engagement groove with a flathead screwdriver is not always necessary, but both may be provided at the same time.
[0045]
In addition, similar to the above-described O-ring formed using a rubber-based or resin-based material, a fingertip operating portion to be formed near the end B may be a fingertip suitable for operating a cap or a knob. If the operation unit is provided, the finger is hard to slip when pushing or turning or pushing around the end B with the fingertip, the end B is easily held, and the finger is hurt even if the end B is operated many times. Advantages such as difficulty are obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view exemplarily illustrating an operation principle relating to a known bayonet lock.
FIGS. 2A and 2B are a side view and a cross-sectional view of a cross section of the male plug 300 and the female plug 200 according to the embodiment of the present invention at the time of coupling.
FIG. 3 is a sectional view of the female plug 200.
4A is a cross-sectional view of the insulator 209, and FIG. 4B is a cross-sectional view of the pressing mechanism M for pressing the insulator 209 to fix the insulator 209 on the same cross section.
FIG. 5 is a front view (a), a side view (b), and cross-sectional views (c) and (d) of each section of the hook bolt 226.
6A is a front view of the adapter unit U, and FIG.
FIG. 7 is a sectional view and a side view of the female plug 200 of the optical connector from which the adapter unit U has been detached.
FIG. 8 is a sectional view and a side view of a female plug 10 of a conventional optical connector.
FIG. 9 is a perspective view of a well-known representative wing nut (a) and a wing screw (b).
[Explanation of symbols]
200… female plug
202… female plug shell
203… slide sleeve
203b ... groove
205… pin
206… pin
207… Insulator
208… insulator
209… Insulator
210… caulking part
211 ... Steel ball engagement groove
213… wound spring
215… slide cover
217… Ferrule (Female plug side)
220 ... Split sleeve (holding member)
221… Split sleeve holder
222 ... Split sleeve holder
223… TM clamp
224… Adapter shaft
224a ... mating pin
225… O-ring
226… hook bolt
227… spring
230… optical fiber cable
300… male plug
301… male plug shell
314… O-ring
317… Ferrule (male plug side)
A, B ... end of adapter shaft 224
h ... Engagement groove with flathead screwdriver
H ... bayonet lock groove
K: Round part of bayonet lock groove H
M: a pressing mechanism for pressing the insulator 209
U… Adapter unit

Claims (11)

In a female plug of an optical connector having a detachable adapter unit provided with a holding member for holding the ferrule in a state in which the end faces of the ferrule face each other,
A female plug for an optical connector, wherein the attachment / detachment mechanism of the adapter unit is configured using a bayonet lock. The female plug of an optical connector according to claim 1, wherein the female plug is internally held by a substantially cylindrical female plug shell. 3. The female plug of the optical connector according to claim 1, wherein the adapter unit has a shaft that transmits a rotation operation for opening and closing the bayonet lock. 4. The body of the female plug from which the adapter unit has been detached,
The female plug of an optical connector according to claim 3, further comprising a hook bolt provided with a bayonet lock groove that can be fitted to the end A of the shaft located on the side opposite to the male plug. . The end portion A has two convex portions substantially orthogonal to the shaft,
The light according to claim 4, wherein at least a part of the engagement groove to be engaged with the flathead screwdriver is formed in the hook bolt by using a part of the bayonet lock groove. Female plug of connector. The optical connector according to any one of claims 3 to 5, wherein an end portion (B) located on the male plug side of the shaft is disposed substantially at the center of a substantially distal end of the female plug. Female plug. By extending when releasing the bayonet lock, having a spring that pushes the end B located on the male plug side of the shaft toward the front of the substantially distal end of the female plug,
The adapter unit includes:
7. The female plug is detached from the female plug by pulling the end portion B pushed by the spring in the same direction in front of the substantially distal end of the female plug. A female plug for the optical connector according to any one of the preceding claims. 8. A fingertip operating part for opening / closing the bayonet lock or taking out the adapter unit near an end B located on the male plug side of the shaft. A female plug for the optical connector according to any one of the preceding claims. The female plug of an optical connector according to claim 8, wherein the fingertip operation unit has an O-ring, a cap, or a knob formed using a rubber-based or resin-based material. The female of the optical connector according to claim 8 or 9, wherein the fingertip operation unit has a substantially butterfly-shaped head that enables or facilitates tightening and loosening only with the force of a finger. plug. The lock groove to be formed on the female side of the bayonet lock,
A first guide groove for guiding a male-side convex portion of the bayonet lock in a central axis direction along a mounting / detaching direction of the mounting / detaching mechanism;
A second guide groove for guiding the convex portion on the male side in a rotation direction about the center axis,
11. The optical connector according to claim 1, wherein an end of the second guide groove has a substantially cylindrical round groove whose axis is substantially orthogonal to the central axis. 12. Female plug.

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