JPH08286068A - Opposition type optical fiber array, its manufacture and optical switch - Google Patents

Abstract

PURPOSE: To provide an opposition type optical fiber array made to improve the positioning accuracy of fiber arranging grooves with each other by facilitating the aligning of array main bodies with each other. CONSTITUTION: In an optical fiber array 1 in which the first fiber arranging groove 4 formed on the surface 2a of a first array main body 2 and the second fiber arranging groove 6 formed on the surface of a second array main body 3 are made to be arranged in opposed states, a sure positioning between the first array main body 2 and the second array main body 3 is made possible by providing one pair of first guide grooves 5 formed at both ends of the surface 2a of the first array main body 2 and placed in parallel with the first fiber arranging groove 4 and one pair of second guide grooves 7 formed the both ends of the surface 3a of the second array main body 3 and placed in parrallel with the second fiber arranging groove 6 and guide member 8 made to be engaged with the first guide grooves 5 and the second guide grooves 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to an opposed type light for optically coupling a first optical fiber arranged in parallel with a fiber alignment groove of an array body and a second optical fiber movable in the arrangement direction of the fiber alignment groove. A fiber array and a manufacturing method thereof,
Further, the present invention relates to an optical switch using the opposed optical fiber array.

[0002]

2. Description of the Related Art As an example of a conventional optical switch, there is JP-A-6-67101. In the device disclosed in this publication, a large number of first optical fibers are arranged in parallel in a multi-stage array main body, and a second optical fiber is fixed to a rotating plate provided on a guide rail extending in the vertical direction. By rotating this rotating plate, the desired first optical fiber and the desired second optical fiber are optically coupled in a non-contact manner. Further, in order to improve switching efficiency between the first optical fiber and the second optical fiber, a first fiber alignment groove of the first array body arranged above and a second fiber alignment groove of the second array body arranged below are arranged. There is an optical fiber array in which the grooves are opposed to each other. As an example of an optical switch using this optical fiber array, there is JP-A-6-75177. In order to improve the switching accuracy of the optical switch in which the array bodies are stacked in multiple stages, the positioning accuracy of the fiber alignment grooves located above and below becomes a problem.

Therefore, conventionally, after the multistage optical fiber array is incorporated in the optical switch, the optical switch is actually driven to move the second movable-side optical fibers into the individual fiber alignment grooves.
While sequentially arranging the optical fibers, the control device stores the position information of each fiber alignment groove, and the control device stores the position information of each fiber alignment groove. Therefore, the second optical fiber can be reliably positioned in each fiber alignment groove based on the position information from the control device.

[0004]

However, when the optical fiber arrays are assembled in multiple stages, the alignment of the vertically aligned fiber alignment grooves is likely to occur. Therefore, since it is necessary to take in the position information for each fiber alignment groove into the control device one by one, it takes time to adjust the position of the fiber alignment groove, and the control device must hold a lot of position information. There was a problem.

The present invention has been made to solve the above-mentioned problems, and in particular, it is an opposed type optical fiber array which facilitates the positioning of the array bodies and improves the alignment accuracy of the fiber alignment grooves. And it aims at providing this manufacturing method.

Further, the present invention is an optical switch in which the position adjustment time of the fiber alignment groove is shortened and the amount of position information of the fiber alignment groove is reduced.

[0007]

An opposed type optical fiber array according to the present invention has a first array body formed on a surface of a first array body.
In an optical fiber array in which a fiber alignment groove and a second fiber alignment groove formed on a surface of a second array body are aligned in a state of facing each other, the fiber alignment groove is formed on both ends of the surface of the first array body, and the first fiber alignment groove is formed. A pair of first guide grooves extending parallel to each other, and a pair of second guide grooves formed on both ends of the surface of the second array body and extending parallel to the second fiber alignment groove; This is a configuration including a guide member fitted into the guide groove and the second guide groove.

Further, it is preferable that the first and second array bodies are made by cutting out one array member.

In the method of manufacturing an optical fiber array according to the present invention, the first fiber alignment groove formed on the surface of the first array body and the second fiber alignment groove formed on the surface of the second array body are aligned in an opposed state. In the opposed optical fiber array thus formed, a step of cutting one array member having a fiber alignment groove extending in the longitudinal direction and a guide groove parallel to the fiber alignment groove, and forming after the array member is cut. Selected two of the array bodies that have been
A step of making the first fiber alignment groove of the array body and the second fiber alignment groove of the second array body face each other, and a guide member is provided in the first guide groove of the first array body and the second guide groove of the second array body. And a step of fitting them.

The optical switch according to the present invention is an optical fiber in which the first fiber alignment groove formed on the surface of the first array body and the second fiber alignment groove formed on the surface of the second array body are aligned in an opposed state. A plurality of first optical fibers provided with an array and arranged in parallel on one side of the first and second fiber alignment grooves, and second optical fibers arranged in a switch space between the first array body and the second array body. In an optical switch for optically coupling a fiber with a drive mechanism, a pair of first guide grooves formed at both ends of the surface of the first array body and extending parallel to the first fiber alignment groove, and a second array body. Facing each other, having a pair of second guide grooves formed at both ends of the surface of the first guide groove and extending in parallel to the second fiber alignment groove, and guide members fitted to the first guide groove and the second guide groove. Type optical fiber array And is a configuration.

[0011]

In the opposing optical fiber array according to the present invention, the first guide groove formed in the first array body and the second guide groove
The second guide groove formed in the array main body is opposed to the guide member, and the guide member is fitted into the first guide groove and the second guide groove to guide the gap between the first array main body and the second array main body. It can be determined by the height of the member, and the relative displacement of the first array body and the second array body does not occur.

In the method of manufacturing an opposed optical fiber array according to the present invention, first, a single array member having a fiber alignment groove extending in the longitudinal direction and a guide groove parallel to the fiber alignment groove is formed. prepare. Then, this array member is cut at equal intervals. Then, two of the plurality of array bodies formed after cutting the array member are selected and the first fiber alignment groove of the first array body and the second fiber alignment groove of the second array body are opposed to each other. And
The first guide groove of the first array body and the second guide groove of the second array body
By fitting the guide member into the guide groove, the first
The distance between the array main body and the second array main body can be determined by the height of the guide member, and the opposed optical fiber array in which the first array main body and the second array main body are not displaced relative to each other is provided. Produced.

In the optical switch according to the present invention, the opposed optical fiber array is the first array body formed on the first array body.
The guide groove and the second guide groove formed in the second array body are opposed to each other, and the guide member is fitted into the first guide groove and the second guide groove, whereby the first array body and the second array body A switch space having a predetermined interval is formed between and. Therefore, when the second optical fiber performs a switching operation within the switch space, the drive mechanism moves the second optical fiber to a predetermined position in the arrangement direction of the first optical fibers. Then, the second optical fiber is moved by the drive mechanism in a direction perpendicular to the arrangement direction of the first optical fibers, and the second optical fiber is moved to one of the first fiber alignment groove or the second fiber alignment groove. By seating on the first optical fiber, selective optical coupling of the second optical fiber to the juxtaposed first optical fiber is achieved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of an opposed optical fiber array according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the opposed optical fiber array, and FIG. 2 is a front view of the optical fiber array shown in FIG. As shown in FIGS. 1 and 2,
The optical fiber array 1 is made of a hard material such as ceramics or silicon, has a block-shaped first array body 2 below, and has a block-shaped second array above.
It has an array body 3. Then, the first array body 2
And the second array body 3 are arranged so as to face each other.

On the surface 2a of the first array body 2 described above,
A plurality of first fiber alignment grooves 4 are formed, and each first fiber alignment groove 4 has a V-shaped cross section and is formed parallel to each other. Then, the first fiber alignment groove 4 is
It is formed linearly so as to bridge the front end 2b and the rear end 2c of the first array body 2.

Further, a pair of left and right first guide grooves 5 are formed at both ends of the surface 2a of the first array body 2. Each first guide groove 5 has a V-shaped cross section, and is formed parallel to the first fiber alignment groove 4. And
Similarly to the first fiber alignment groove 4, the first guide groove 5 is also linearly formed so as to bridge the front end 2b and the rear end 2c of the first array body 2.

Here, the second array body 3 also has the same shape as the first array body 2 described above, and a plurality of second fiber alignment grooves 6 having a V-shaped cross section are formed on the surface 3a. The second guide groove 7 which is formed and has a V-shaped cross section
Are formed in pairs.

Therefore, by aligning the first fiber alignment groove 4 of the first array body 2 and the second fiber alignment groove 6 of the second array body 3 so as to face each other, the first guide groove 5 and the second guide groove 5 are aligned. 7 and 7 can be aligned facing each other. Then, by fitting a cylindrical guide member into the first guide groove 5 and the second guide groove 7, a part of the peripheral surface of the guide member 8 and each of the first and second guide grooves 5 and 7 are formed. A part of the surface can be joined. As a result, the use of the guide member 8 prevents the first array body 2 and the second array body 3 from being displaced relative to the side.

By applying an adhesive to the first and second guide grooves 5 and 7 in advance, the guide member 8 can be securely fixed to the first and second guides 5 and 7. You can The distance H between the first array body 2 and the second array body 3 is determined by the diameter of the guide member 8, the depth D of the first and second guide grooves 5, 7 and the apex angle α.
Then, the first fiber alignment groove 4 and the second fiber alignment groove 6
If and have a mirror-symmetrical shape, as shown in FIG. 3, the pitches of the first and second fiber alignment grooves 4 and 6 may be formed at equal intervals, and as shown in FIG. The pitches of the first and second fiber alignment grooves 4 and 6 may be formed at non-uniform intervals.

Next, another embodiment of the opposed optical fiber array of the present invention will be described. The same or equivalent components as those of the optical fiber array 1 of FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

The optical fiber array 10 shown in FIG. 5 includes a first array body 2 and a second array body 3, and the first array body 2 and the second array body 3 are provided.
A pair of first guide grooves 9 are formed at both ends of the surface 2a of the array body 2. Each of the first guide grooves 9 has a U-shaped cross section and is formed parallel to the first fiber alignment groove 4. The first guide groove 9 has a depth K and a width W, and bridges the front end 2b and the rear end (not shown) of the first array body 2 like the first fiber alignment groove 4. Is formed linearly.

Further, the second array body 3 is the first array body described above.
The surface 3a has the same shape as the array body 2
A plurality of second fiber alignment grooves 6 each having a V-shaped cross section are formed in the groove, and a pair of second guide grooves 11 each having a U-shaped cross section are formed.

Here, the first fiber alignment groove 4 of the first array body 2 and the second fiber alignment groove 6 of the second array body 3 are aligned so as to face each other, whereby the first guide groove 9 and the second guide groove 9 are aligned. The groove 11 can be aligned in a state of facing each other. And the same width W as the first and second guide grooves 9 and 11
The guide member 12 in the shape of a quadrangular prism with the first guide groove 9
It is possible to join the end face of the guide member 12 and the respective surfaces of the first and second guide grooves 9 and 11 by fitting the end face of the guide member 12 and the second guide groove 11. Therefore, by using the rectangular columnar guide member 8, it is possible to prevent the relative displacement between the first array body 2 and the second array body 3.

The first and second guide grooves 9 and 11 and the guide member 12 may be fixed with an adhesive. Further, the distance H between the first array body 2 and the second array body 3
Is the height G of the guide member 8 and the first and second guide grooves 9,
Depth K of 11 and.

Next, a method of manufacturing the optical fiber array 1 shown in FIG. 1 will be described.

First, as shown in FIG. 6, a long array member 2 made of a hard material such as ceramics or silicon.
A plurality of fiber alignment grooves 21 and a guide groove 22 parallel to each fiber alignment groove 21 are cut and formed on the surface 20a of 0. After that, as shown in FIG. 7, the array member 20 is cut at equal intervals in a direction perpendicular to the extending direction of the fiber alignment groove 21. Then, after this cutting, a plurality of array bodies 23 are cut out from one array member 20. After that, two array bodies to be used as the first and second array bodies 2 and 3 shown in FIG. 1 are selected from these array bodies 23. The first array body 2
The second array body 3 and the second array body 3 may have different lengths.

After that, as shown in FIG. 8, the first and second
First and second fiber alignment grooves 4, 6 of array bodies 2, 3
On the one end side of the tape, the plurality of first optical fibers 25 exposed from the front end of the tape core wire 24 are brought into contact with the respective first and second fiber alignment grooves 4 and 6, and then fixed with an adhesive. Thereafter, as shown in FIG. 9, the first fiber alignment groove 4 of the first array body 2 and the second fiber alignment groove 6 of the second array body 3 are opposed to each other, and the guide groove 5 of the first array body 2 and Two
Two cylindrical guide members 8 are arranged between the array main body 3 and the guide groove 7. Then, the guide member 8 is fitted into the first guide groove 5 and the second guide groove 7 while bringing the first array body 2 and the second array body 3 close to each other (see FIG. 1).

Before or after the guide member 8 is fitted, an adhesive is applied to the contact portions between the guide grooves 5 and 7 and the guide member 8 so that the first array main body is passed through the guide member 8. 2 and the second array body 3 can be securely fixed. The shapes of the guide grooves 5, 7 and the guide member 8 are not limited to those described above, and may be the shapes shown in FIG. Furthermore, when selecting two array bodies from one array member 20, the array member 20
When the array main bodies cut out adjacent to each other are used, the positional accuracy of the fiber alignment grooves facing each other can be further improved.

Next, a multistage optical switch using the opposed optical fiber array will be described.

As shown in FIGS. 10 and 11, the opposed optical fiber array 30 includes an array body 31 of the first layer located at the bottom, an array body 32 of the second layer located at the middle and the middle. The third layer array main body 33 located on the upper stage and the fourth layer array main body 34 located on the uppermost stage are provided. In addition, on the upper surface of the array body 31 of the first layer, the first
Rows of fiber alignment grooves 31a are formed, and second and third rows of fiber alignment grooves 32a and 32b are formed on the lower and upper surfaces of the second layer array body 32, and the third layer array body 33 is formed. The fourth and fifth rows of fiber alignment grooves 33a and 33b are formed on the lower surface and the upper surface thereof, and the sixth row of fiber alignment grooves 34a is formed on the lower surface of the array body 34 of the fourth layer.
Are formed.

Further, first rows of guide grooves 35 having a V-shaped cross section are formed at both ends of the upper surface of the first-layer array body 31, and the lower surface and the upper surface of the second-layer array body 32 are formed. Second and third row guide grooves 36 and 37 having a V-shaped cross section are formed on each surface, and a V-shaped cross section is formed on each of the lower surface and the upper surface of the array body 33 of the third layer. The fourth and fifth rows of guide grooves 38 and 39 are formed, and the sixth row of guide grooves 40 having a V-shaped cross section is formed on the lower surface of the array body 34 of the fourth layer. .

Therefore, the array body 31 of the first layer and the second
The second layer array body 32 is opposed to the second layer array body 32, and the third layer array body 33 is opposed to the third layer array body 32.
The array body 33 of the layer and the array body 34 of the fourth layer are opposed to each other. Then, a cylindrical first guide member 41 is fitted into the first-row guide groove 35 and the second-row guide groove 36 to form a third-row guide groove 37 and a fourth-row guide groove 38. The second guide member 42 having a cylindrical shape is fitted, and the guide groove 39 in the fifth row and the guide groove 40 in the sixth row have a cylindrical third shape.
The guide member 43 of is fitted.

As a result, the first-row fiber alignment groove 31a is formed.
And the fiber alignment groove 32a of the second row are mirror-symmetrically opposed to each other, the fiber alignment groove 32b of the third row and the fiber alignment groove 33a of the fourth row are mirror-symmetrically opposed, and the fiber alignment of the fifth row is aligned. The groove 33b and the fiber alignment groove 34a in the sixth row can be made to face each other in a mirror-symmetrical shape. And the first
A horizontally long first switch space A is formed between the array body 31 of the second layer and the array body 32 of the second layer.
A horizontally long second switch space B is formed between the array body 32 of the third layer and the array body 33 of the third layer.
A horizontally long third switch space C is formed between the array body 33 of the layer and the array body 34 of the fourth layer. By supporting the entire optical fiber array 30 having the above-mentioned configuration by the side plate 41, lateral displacement of the optical fiber array 30 is reliably prevented.

As shown in FIG. 1, the optical fiber array 30.
A drive mechanism 43 for driving the second optical fiber 42, which is the optical fiber on the master side, in the fiber arrangement direction (X direction) and in the direction perpendicular to this fiber arrangement direction (Y direction) is arranged in front of the. ing. This drive mechanism 43
Is a first linear guide rail (for example, a first ball screw shaft 44) extending in the X direction and a second linear guide rail (for example, a second ball screw shaft 44) arranged at one end of the optical fiber array 30 and extending in the Y direction. 45), a third linear guide rail (for example, a guide shaft 46) arranged at the other end of the optical fiber array 30 and extending in the Y direction, and a block-shaped master head 47 in which the first ball screw shaft 44 is screwed. It has and.

Further, in the drive mechanism 43, one end of the first ball screw shaft 44 is rotatably inserted and the block-shaped first guide member 48 into which the second ball screw shaft 45 is screwed, and the first ball screw shaft 44. Second guide member 49 having the other end rotatably inserted and having the guide shaft 46 penetrated through it, and a first drive motor 50 fixed to the first guide member 48 and rotating the first ball screw shaft 44. A second drive motor 51 for rotating the second ball screw shaft 45, and a rotating plate 52 fixed to the side wall of the master head 47 and vertically moving the tip of the second optical fiber 42 in the Y direction.

Here, as shown in FIG. 12 and FIG.
Each fiber alignment groove 32a, 32 of the optical fiber array 30
The front end of the first optical fiber 53 is fixed to one end of each of the a, 32b, 33a, 33b, and 34a.
The tip of the second optical fiber 42 is inserted into any of the first to third switch spaces A, B, and C. Therefore, the second optical fiber 42 can be easily attached to any of the fiber alignment grooves 32a to 34a simply by moving the tip of the second optical fiber 42 up and down.

Next, the operation of the above-mentioned optical switch will be described.

First, when performing the switching operation only within the first switch space A, the first drive motor 50
Is driven to move the master head 47 to a predetermined position. As a result, the second optical fiber 42 is provided between one of the first-row fiber alignment grooves 31a and the one of the second-row fiber alignment grooves 32a, which are vertically symmetrical.
To place. After that, the rotating plate 52 is operated, and the second
The optical fiber 42 is moved upward or downward in the Y direction. As a result, the second optical fiber 42 is seated in one of the first row and second row fiber alignment grooves 31a, 32a, and the first optical fiber 53 and the second optical fiber 4 are seated.
Selective optical coupling with 2 is achieved. The case where the second optical fiber 42 performs the switching operation only in the second and third switch spaces B and C is the same as the case described above, and therefore the description thereof is omitted.

Further, as shown in FIG. 13, when the second optical fiber 42 moves from the second switch space B to the third switch space C, first, the second optical fiber 42 is neutralized by the rotating plate 52. After the position, the first drive motor 50 is driven to move the master head 47 laterally, and the first drive motor is moved to a position where the second optical fiber 42 is disengaged from the array body 33 of the third layer. Stop 50. After that, the second drive motor 51 is driven to raise the master head 47 by a predetermined amount to position the second optical fiber 42 to the side of the third switch space C. Then, the first drive motor 50 is driven to drive the second optical fiber 4 to a predetermined position in the third switch space C.
Move 2 In addition, each switch space A, B, C
The operation when the second optical fiber 42 is moved between each other is the same as that described above, and thus the description thereof is omitted.

Here, the above-mentioned first to third guide members 4
In each of the switch spaces A, B, and C, 1 to 43 are retracted to the extent that the second optical fiber 42 does not hit. Therefore, a smooth transition of the second optical fiber 42 between the switch spaces A, B, C can be achieved, and the second optical fiber 42 does not hit the guide members 41 to 43. It is not necessary to separately provide the drive mechanism 43 with a means for retracting the optical fiber 42.

[0042]

According to the opposed optical fiber array and the manufacturing method of the present invention, the first array body and the second array body are positioned by the cooperation of the first guide groove, the second guide groove and the guide member. Therefore, the array bodies can be easily positioned with each other, and the alignment accuracy of the fiber alignment grooves can be improved. When the optical fiber array of the present invention is used in an optical switch, the first array body and the second array body
Since it is reliably positioned with respect to the array body, the positional information for each fiber alignment groove may be either the first fiber alignment groove or the second fiber alignment groove. Therefore, since the amount of position information can be halved, the time for adjusting the position of the fiber alignment groove can be shortened, and the memory for storing the position information of the fiber alignment groove can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of an opposed optical fiber array of the present invention.

FIG. 2 is a plan view of the optical fiber array shown in FIG.

FIG. 3 is a plan view of an optical fiber array having fiber alignment grooves with equal pitch intervals.

FIG. 4 is a plan view of an optical fiber array having fiber alignment grooves with non-uniform pitch intervals.

FIG. 5 is a perspective view showing a second embodiment of the opposed optical fiber array of the present invention.

FIG. 6 is a perspective view showing an elongated array member having a fiber alignment groove and a guide groove.

7 is a perspective view showing a state in which the array member shown in FIG. 6 is cut at equal intervals.

FIG. 8 is a first view of the first fiber alignment groove of the cut array body.
It is a perspective view which shows the state which fixed the optical fiber.

FIG. 9 is a perspective view showing a state before the first array body, the second array body, and the guide member are assembled.

FIG. 10 is a perspective view showing an embodiment of an optical switch to which a facing optical fiber array is applied.

11 is an enlarged plan view of an essential part showing an optical fiber array used in the optical switch of FIG.

FIG. 12 is a cross-sectional view showing a state before optical coupling between the first optical fiber and the second optical fiber.

FIG. 13 is a perspective view showing a locus when the second optical fiber moves from the lower stage to the upper stage.

[Explanation of symbols]

1 ... Optical fiber array, 2 ... 1st array main body, 3 ... 2nd
Array body, 2a, 3a ... Surface, 4 ... First fiber alignment groove, 5 ... First guide groove, 6 ... Second fiber alignment groove, 7 ...
Second guide groove, 8 ... Guide member, 20 ... Array member.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Murakami 1 Taya-cho, Sakae-ku, Yokohama-shi, Kanagawa Sumitomo Electric Industries, Ltd. Yokohama Works (72) Inventor Nobuo Tomita 1-6, Uchisaiwai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation

Claims (4)

[Claims] 1. A first fiber alignment groove formed on a surface of a first array body and a second fiber alignment groove formed on a surface of a second array body.
In an optical fiber array in which fiber alignment grooves are aligned in a state of facing each other, a pair of first guide grooves formed at both ends of the surface of the first array body and extending parallel to the first fiber alignment grooves, A pair of second guide grooves formed on both ends of the surface of the second array body and extending parallel to the second fiber alignment groove, and fitted into the first guide groove and the second guide groove. And a guide member, and an opposed type optical fiber array. 2. The opposed optical fiber array according to claim 1, wherein the first array body and the second array body are cut out from one array member. 3. A first fiber alignment groove formed on the surface of the first array body and a second fiber alignment groove formed on the surface of the second array body.
In an opposed-type optical fiber array in which fiber alignment grooves are aligned in an opposed state, a single array member having a fiber alignment groove extending in a longitudinal direction and a guide groove parallel to the fiber alignment groove is cut. And selecting two of the plurality of array bodies formed after cutting the array member to form a first fiber alignment groove of the first array body and a second fiber alignment groove of the second array body. And a step of fitting a guide member into the first guide groove of the first array body and the second guide groove of the second array body. Manufacturing method. 4. A first fiber alignment groove formed on the surface of the first array body and a second fiber alignment groove formed on the surface of the second array body.
An optical fiber array in which fiber alignment grooves are aligned in opposition to each other, a plurality of first optical fibers arranged in parallel on one side of the first and second fiber alignment grooves, the first array body, and the first optical fiber An optical switch that optically couples a second optical fiber disposed in a switch space between the two array bodies with a driving mechanism, the optical switch being formed at both ends of the surface of the first array body, and with respect to the first fiber alignment groove. A pair of first guide grooves extending parallel to each other; a pair of second guide grooves formed at both ends of the surface of the second array body and extending parallel to the second fiber alignment groove; An optical switch comprising an opposed optical fiber array having a guide groove and a guide member fitted in the second guide groove.