JP2006220736A - Optical transceiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical transceiver having increased electrostatic resistance. <P>SOLUTION: The optical transceiver is equipped with a housing 4 that is inserted from the outside of transmitting equipment into the inside thereof, an engaging member 6 that is engaged at one end with a hole 5 provided in the transmitting equipment for the purpose of locking the housing 4, and an optical element 16 that is incorporated in the housing 4, wherein the engaging member 6 is composed of an electrical insulating material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical transceiver having a casing made of an electrically insulating material, and relates to an optical transceiver having improved electrostatic resistance.

  As shown in FIG. 7, a transmission device 101 that uses light for communication with the outside is equipped with an optical transceiver 102 that is responsible for conversion between the optical signal and an internal electrical signal. The optical transceiver 102 is detachably mounted on the transmission device 101 so that only the optical transceiver 102 can be replaced when the optical transceiver 102 itself fails or the specification is changed.

  The optical transceiver 102 includes an optical element used for optical transmission or reception, an electric circuit related to driving and amplification of the optical element, and an electric circuit related to conversion of an optical communication code having a different number of bits to an electric communication code. It is built in and connected to a motherboard in the transmission device 101 so as to be connected to an electric circuit for switching channels and holding communication data placed in the transmission device 101.

  In order to hold the optical transceiver 102 on the mother board, the mother board is provided with a cage 103, that is, a box-shaped metal case having an opening substantially the same shape as the housing 104 of the optical transceiver 102. A connector for electrically connecting the electrical circuit of the optical transceiver 102 and the motherboard is placed at the innermost part of the cage 103. The casing of the optical transceiver 102 is inserted into the cage 103 from the outside of the transmission device 101, so that only the head 104a remains outside the transmission device.

  A connector hole for inserting the optical connector 106 of the optical fiber 105 is formed in the head 104a of the housing. When the optical connector 106 is inserted into the connector hole, an optical element built in the housing 104 is formed. And the optical fiber 105 are optically coupled. The head 104a of the housing protrudes out of the transmission device 101 so that the operator can easily insert and remove the optical connector 106 or the optical transceiver itself into and from the transmission device.

  A lock mechanism is configured between the optical transceiver 102 and the cage 103 so that the optical transceiver 102 does not come off the transmission device 101 at a timing not desired by the operator. That is, as shown in FIG. 8, the cage 103 is provided with a hole 105 as an element of the locking mechanism. The optical transceiver 102 is provided with a protrusion 106a that engages with the hole 105 as an element of the lock mechanism as a counterpart. This protrusion 106a must be removed from the hole 105 when desired. Therefore, the protrusion 106 a is formed at one end of the insulator 106. If the lever 106 can be operated, the lock can be released.

  Generally, the opposite end 106b of the insulator 106 extends into the head, and the opposite end 106b of the insulator 106 is swung by a crank 107a. The lever 107 connected to the crankshaft 107b is bent so as to be positioned on the surface of the head 104a so that the operator can move the crank 107a. As a result, when the operator operates the lever 107, the lever 106 is swung by the crank 107 a, and the protrusion 106 a is removed from the hole 105 of the cage 103.

  The lever 107 and the crank 107a can be provided as an integrated part (hereinafter, the integrated part is referred to as the lever 107). However, the lever 107, the insulator 106, and the housing 104 are separate parts. In order to attach the lever 107 and the insulator 106 to the housing 104, the holding cover 108 is required. The holding cover 108 covers the lever shaft (fulcrum) and the shaft of the crank and holds the lever 106 and the lever 107 in the housing 104.

  The upper space where the elements of the lock mechanism are arranged is a space into which the optical connector is inserted, and an optical element 116 facing the optical path is provided in this space. In other words, a metal collar 109 and a block 117 are attached to a can that houses the optical element 116, and a resin receptacle 113 is further packaged on the block 117. Therefore, the block 117 protrudes forward inside the receptacle 113.

US Pat. No. 6,439,918

  By the way, the housing of the optical transceiver has recently been made of resin in order to reduce manufacturing costs. Resin is an electrically insulating material. The optical element and the electric circuit incorporated in the casing need to be electromagnetically shielded because they operate at a high frequency. However, since the cage is made of metal, there is no problem even if the casing is made of resin.

  On the other hand, members attached to the housing such as levers, levers, and holding covers are still made of metal in order to ensure mechanical strength while being relatively small or thin. This is because even if these metal accessory members are attached to the housing, the housing provides electrical insulation, so it was thought that there was no electrical effect on the optical elements and electrical circuits.

  However, it was discovered by a test conducted by the present applicant that a metal attachment member attached to a resin casing is insufficient in resistance to static electricity. Although details of the test will be described later, the present applicant has clarified that the cause of weakening the static electricity resistance is these accessory members.

  Even in an optical transceiver whose casing is made of a metal material, it is considered that the head 104a is coated with an insulating film so that the head 104a protruding out of the transmission device 101 does not pass external static electricity. It is done. Then, since the head 104a is less likely to pass static electricity, the static electricity resistance of the metal accessory member described above becomes a problem.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an optical transceiver that solves the above-described problems and has increased resistance to static electricity.

  In order to achieve the above object, the present invention provides a housing inserted into the transmission device from the outside of the transmission device, and one end of a hole provided in the transmission device to lock the housing to the transmission device. In an optical transceiver including an engaging member to be engaged and an optical element built in the housing, the engaging member is made of an electrically insulating material.

  Further, the present invention provides a housing that is inserted into a cage inside the transmission device from the outside of the transmission device and a part (referred to as a head) remains outside the transmission device, and for locking the housing to the cage. One end of the cage engages with a hole provided in the cage and swings about the shaft, a lever connected to the shaft of the swing member and positioned on the surface of the head, and the housing In an optical transceiver including an optical element built in and located in the transmission device, at least the swing member is made of an electrically insulating material, and the swing member has a predetermined pull-out resistance. is there.

  Further, the present invention provides a housing that is inserted into a cage inside the transmission device from the outside of the transmission device and a part (referred to as a head) remains outside the transmission device, and for locking the housing to the cage. A lever that engages with a hole provided in the cage, a crank that swings the opposite end of the lever extending into the head, and a shaft of the crank that is connected to the surface of the head. A lever, a holding cover that covers the lever shaft and the crank shaft, and holds the lever and the lever in the casing; and an optical element that is built in the casing and positioned in the transmission device. In an optical transceiver, at least the insulator is made of an electrically insulating material.

  The lever is provided at a position where the lever shaft does not enter the cage, and an opposite arm on the head side from the lever shaft with respect to the one side arm positioned on the cage side from the lever shaft is provided on the casing. Even if the lever shaft is arranged closer to the outside of the housing, the one-sided arm is formed by forming a projection formed stepwise toward the outside and extending toward the hole of the cage at the tip of the one-sided arm. May enter the inside of the cage regardless of the swinging posture of the insulator.

  The insulator is a crank that forms an inclined portion inclined inward of the housing at the tip of the opposite arm on the head side from the insulator shaft, and guides the crank along the inclination of the inclined portion. A groove may be formed.

  The insulator is formed with a protrusion extending toward the hole of the cage at the tip of the one-side arm located on the cage side from the insulator shaft, and stress is concentrated on an inner angle formed by the one-side arm and the protrusion. A build-up portion that relaxes may be formed.

  The holding cover may be made of an electrically insulating material.

  You may comprise the said insulator with polyetherimide.

  You may comprise the said housing | casing with an electrically insulating material.

  The casing may be made of a metal material, and at least a part of the casing remaining outside the transmission device may be coated with an insulating film.

  The present invention exhibits the following excellent effects.

  (1) Resistance to static electricity can be increased.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, an optical transceiver 1 according to the present invention is inserted into a cage 3 in a transmission device from the outside of the transmission device (in the figure, the left side of the transmission device surface panel 2 is outside and the right side is inside). In this case, a part of the casing 4 that remains outside the transmission device (which is referred to as the head 4a) and an insulator with one end (operating point) engaged with a hole 5 provided in the cage 3 to lock the casing 4 to the cage 3 6 and a crank 7a for swinging the opposite end (power point) of the lever 6 extending into the head 4a, and a lever 7 connected to the crank shaft (indicated by a point) and positioned on the surface of the head 4a. And a holding cover 8 that covers the shaft of the lever 7 (fulcrum: indicated by a point) and the shaft of the crank 7a and holds the lever 6 and the lever 7 in the casing 4, and is built in the casing 4 and is located in the transmission device. The housing 4 is made of an electrically insulating material. In the transceiver 1, which is constituted at least lever 6 an electrically insulating material.

  The insulator 6 is also called an engaging member or a swing member.

  In this embodiment, the holding cover 8 is also made of an electrically insulating material. The lever 7 may be made of an electrically insulating material, but here it is made of the same metal as the conventional one.

  The optical element is housed in a metal case called a can 9, and the power line, ground line, and signal line of the optical element are taken out from the bottom (right side in the figure) of the can 9 by leads (not shown). The leads are soldered to the substrate 10. The can 9 is electrically connected to the earth line, and is therefore grounded to the earth of the substrate 10.

  On the substrate 10, an electric circuit related to driving and amplification of the optical element and an electric circuit (not shown) related to transmission code conversion are mounted. The board 10 is inserted into a board connector 11 disposed at the innermost part of the cage 3. The board connector 11 is mounted on the motherboard 12 of the transmission device.

  The top (left side in the figure) of the collar 9 that is externally mounted on the can containing the optical element is an optical path. A block 17 is attached to the collar 9, and a resin receptacle 13 that covers the periphery of the optical path is attached to the block 17. It has been. The receptacle 13 is intended to optically couple the optical element and the optical fiber 14 by abutting with the optical connector 15 of the optical fiber 14.

  In the illustrated embodiment, since the hole 5 is provided at the bottom of the cage 3, the insulator 6 is located at the bottom of the housing 4 and has a protrusion that is bent downward and fits into the hole 5. The lever 7 is configured to rotate from the top of the housing 4 toward the front (left side in the figure). If the hole 5 is provided in the side part or upper part of the cage 3, the position of the insulator 6 and the direction of the protrusions follow it. Further, the shape and arrangement of the lever 7 are not limited to those illustrated.

  Now, in the present invention, the positional relationship among the accessory members attached to the housing 4 in order to constitute the lock mechanism, that is, the insulator 6, the lever 7 (including the crank 7a), the holding cover 8, and the optical element is important. Therefore, FIG. 2 is an enlarged view of a part of FIG. 1 and shows only main members.

  As shown in FIG. 2, a protrusion 6 a that fits into the hole 5 of the cage 3 and engages with the cage 3 is formed at one end of the insulator 6. The insulator 6 extends forward (leftward in the figure) from one end where the protrusion 6a is located, and the opposite end 6b of the insulator 6 is positioned in front of the head 4a. An insulator shaft 6c is provided in the middle of the insulator 6. The lever shaft 6 c is fitted into a bearing formed on the lever 6, and is supported by the holding cover 8 so as not to fall from the housing 4. As a result, the lever 6 can rotate with the lever shaft 6c as a fulcrum, the opposite end 6b as a power point, and the protrusion 6a as an action point. When the opposite end 6b is lowered, the protrusion 6a is raised and comes out of the hole 5.

  A crank 7 a is connected to the opposite end 6 b of the insulator 6. That is, the opposite end 6b is a U-shaped groove, and a crank 7a is provided so as to be held in the U-shaped groove. A shaft 7 b for rotating the crank 7 a is fitted from below into a bearing (not shown) formed on the inner lower surface of the housing 4, and is supported by the holding cover 8 so as not to fall from the bearing. When the crank 7a moves counterclockwise by the rotation of the shaft 7b, the opposite end 6b of the insulator 6 is lowered.

  The shaft 7b of the crank 7a is integrated with the outer frame 7c of the lever 7 by caulking. The outer frame 7c is provided so as to be bent in a U-shape with the bottom opened when viewed from the front, along the upper part and both side parts of the head part 4a. A portion of the outer frame 7c located at the upper portion of the head 4a has a thickness so that it can be easily hooked with an operator's fingertip. The outer frame 7c is formed in a thin plate shape along the both sides. This is because the horizontal width of the optical transceiver 1 should not be larger than the specified value.

  The internal structure around the optical element will be described with reference to FIG.

  A can 91 containing the optical element 16 is covered with a metal (SUS) collar 9 by resistance welding. One end of the can 91 is formed by a lens 92 for passing the optical path of the optical element 16, and the collar 9 is also opened at the lens 92. A metal (SUS) block 17 is fixed to the collar 9 by YAG welding. A ferrule 93 made of zirconia is press-fitted into the hollow portion of the block 17. The central axis of the ferrule 93 is composed of an optical fiber 94. A plastic receptacle 13 is attached to the block 17. A split sleeve 95 made of zirconia is provided on the inner periphery of the receptacle 13, and a ferrule 93 is inserted into the split sleeve 95.

  Therefore, when the structure of FIG. 9 is applied to FIG. 2, the metal block 17 protrudes forward inside the receptacle 13.

  In the optical transceiver 1 having the above configuration, in order to examine how much the static electricity resistance is improved from the conventional optical transceiver, first, the static resistance test was performed on the conventional optical transceiver. In the test method, while the optical transceiver of the sample is communicating, the probe charged to a desired voltage is discharged close to various parts of the optical transceiver (air discharge), and finally the optical transceiver Contact the test site. At that time, the presence or absence of a transmission error (sign error) was examined. The discharge was performed 10 times. If one or more code errors occurred, the probe voltage was judged as NG, and if no code error occurred, the probe voltage was gradually raised and the limit voltage at which no code error occurred was measured. FIGS. 3A to 3E used for explaining this test depict the periphery of the head with the optical transceiver housing and the optical connector made virtually transparent.

  As shown in FIG. 3A, the conventional optical transceiver has a metal insulator 36, a lever 37, and a holding cover 38 on the head (not shown because it is transparent) inserted into the cage 303. It is attached. A crankshaft 37b extending in the lateral width direction of the housing is integrated with the lever 37, and the middle of the crankshaft 37b is bent to form a crank 37a. One end of the insulator 36 is located in the cage 3, and a protrusion 36a is formed. The opposite end 36b of the insulator 36 holds a crank 37a. The shaft 36 c of the insulator 36 extends in the lateral width direction of the housing and penetrates the bulging portion of the insulator 36, so that it is integrated with the insulator 36.

  Since the receptacle 313 accommodated in the housing is illustrated, the positional relationship between the receptacle 313 and the insulator 36, the lever 37, and the holding cover 38 can be understood from this figure. As described with reference to FIGS. 2 and 8, there are the collars 9 and 119 mounted on the can containing the optical elements in the back of the receptacle 313.

  FIG. 3B shows a state where the holding cover 38 is actually removed from the state of FIG. FIG. 3C shows a state in which the insulator 36 is actually removed from the state of FIG. FIG. 3D shows a state where the holding cover 38 and the insulator 36 are actually removed from the state of FIG. FIG. 3 (e) shows a state where the lever 37 and the holding cover 38 are actually removed from the state of FIG. 3 (a).

  The static electricity resistance test was performed by discharging the optical transceiver in the state shown in FIG. 3A to FIG. The symbol of discharge represents the approximate discharge direction, and the number attached thereto represents the limit voltage (unit: KV).

  According to FIG. 3A, a transmission error occurs at 0.2 KV when the upper part of the lever 37 is discharged without removing the accessory parts (that is, in a normal state).

  According to FIG. 3B, when the holding cover 38 is removed, a transmission error occurs at 0.5 KV when the upper portion of the lever 37 is discharged.

  According to FIG. 3C, when the insulator 36 is removed, a transmission error occurs at 0.5 to 2 KV when the lever 37 is discharged to the top. Further, when the front cover 38 is discharged to the front end, a transmission error occurs at 2 KV. Further, when the side of the lever 37 is discharged, a transmission error occurs at 2 KV.

  According to FIG. 3D, when the holding cover 38 and the insulator 36 are removed, a transmission error occurs at 6 KV when the lever 37 is discharged to the top. Further, when the crank 37a is discharged, a transmission error occurs at 6 KV. Further, when the side of the lever 37 is discharged, a transmission error occurs at 6 KV.

  According to FIG. 3E, when the lever 37 and the holding cover 38 are removed, a transmission error occurs at 0.2 KV when the opposite end 36b of the insulator 36 is discharged.

  When the above results are combined, it can be seen that the static electricity resistance is highest when the holding cover 38 and the insulator 36 are removed. It can also be seen that when only the insulator 36 is removed, the static electricity resistance is somewhat high.

  From this result, the following inference is derived. As shown in FIG. 8, the distance L1 in the depth direction between one end of the insulator 106 positioned in the hole 105 of the cage 103 and the tip of the metal portion on the optical element 116 side (that is, the block 117) is, for example, 2.45 mm. It is. Further, a distance L2 in the depth direction between the rear end of the holding cover 108 and the front end of the block 117 is, for example, 6.55 mm. That is, in the conventional optical transceiver, metal parts such as the insulator 106 and the holding cover 108 are located at a considerably close distance from the block 117. Therefore, if the insulator 106, the holding cover 108, or the lever 107 electrically connected to the insulator 106 is discharged, a secondary influence (discharge current or induced current) will be exerted on the block 117. . Although it is almost impossible to elucidate the path of the discharge current in detail, the current also flows through the can 91 (see FIG. 9) connected to the block 117, and the potential of the optical element 116 is relatively changed. It seems that a noise current is superimposed on the signal line of the optical element 116 to induce a transmission error. In particular, when the optical element 116 is a photodiode used for reception, it is inferred that the noise current is relatively large compared to the current obtained by photoelectrically converting the optical signal, so that it is strongly influenced by the noise current. .

  On the other hand, in the test of FIG. 3, even if the lever 37 is discharged with the insulator 36 and the holding cover 38 removed, a transmission error hardly occurs. This is probably because the lever 107 is far from the block 117 in FIG. 8, so even if the lever 107 is discharged, the block 117 and the collar 109 are hardly affected. Yes.

  The optical transceiver 1 of the present invention shown in FIG. 1 and FIG. 2 comprises an insulator 6 and a holding cover 8 made of an electrically insulating material. Therefore, it can be expected that the static electricity resistance is higher than the conventional one. The test for confirming this was performed as follows.

  Fig. 4 shows the test equipment. In a simple anechoic chamber 41, a reference plane plate 42 grounded to a ground potential is placed, a wooden desk 43 having a wooden height of 0.8 m is placed on the reference plane plate 42, and a test simulating transmission equipment on the desk. The chassis 44 is placed. The sample optical transceiver 45 is attached to the test chassis 44 in the same manner as the sample optical transceiver 45 is attached to the transmission device (that is, the head is exposed outside the test chassis 44). The reception output of the optical transceiver 45 is connected back to the transmission input. A battery 46 is used as a power source for the optical transceiver 45.

  A signal generator 47 that generates a transmission signal having a desired bit pattern outside the simple anechoic chamber 41, a laser diode 48 that converts the transmission signal into an optical signal, and a desired attenuation in the optical signal that simulates transmission loss. A variable attenuator 49 for providing a quantity is installed, and the optical fiber 50 is guided from the variable attenuator 49 to the optical transceiver 45 so that a test optical signal can be provided. Further, the optical fiber 52 is guided from the optical transceiver 45 to the detector 51 that detects a transmission error so that the optical signal folded by the optical transceiver 45 can be inspected. Then, a probe 54 of an ESD (electric static discharge) generator 53 capable of emitting a desired high voltage for a desired short time is arranged so as to be applied to a desired part of the optical transceiver 45. Here, it is set as the arrangement | positioning discharged to the upper part of the lever 37 shown to Fig.3 (a), and a test of a contact discharge and an air discharge is performed.

  Tables 1 and 2 show the results of testing the conventional optical transceiver (two types) and the optical transceiver 1 of the present invention (two types) in the above test facility. In the conventional optical transceiver, two samples of the same type are the conventional type # 1 and the conventional type # 2. In the optical transceiver of the present invention, the present invention type # 1 comprises the insulator 6 and the holding cover 8 described in FIG. 1 made of an electrically insulating material, and the present invention type # 2 comprises only the insulator 6 made of an electrically insulating material. It is a thing.

  Table 1 shows the case of contact discharge. The number of transmission errors (code errors) that occur when each voltage is discharged 10 times is entered. As can be seen, the conventional type # 1 and # 2 have two or three digits of transmission error at any voltage, whereas the present invention types # 1 and # 2 have zero transmission error regardless of the voltage. .

  Table 2 shows the case of air discharge. The number of transmission errors (code errors) that occur when each voltage is discharged 10 times is entered. In the conventional types # 1 and # 2, a transmission error of 2 digits or 3 digits occurs at any voltage, whereas in the present invention types # 1 and # 2, the transmission error is 0 regardless of the voltage.

  From the above test, it was proved that the optical transceiver 1 of the present invention has higher resistance to static electricity than the prior art because the insulator 6 and the holding cover 8 are made of an electrically insulating material.

  Next, materials and structures of the insulator 6 and the holding cover 8 will be described.

  As shown in FIG. 5A, the conventional holding cover 108 is integrally formed by pressing a metal plate, and a crankshaft cover portion 181 that supports the shaft 107b (see FIG. 8) of the crank 107a from below. , A bulging portion 182 that secures the movement space of the crank 107 a, a lever shaft cover portion 183 that supports the lever shaft 106 c from below, a side plate 184 that is raised along both side surfaces of the case 104, and a side surface of the case 104 And a snap window (not shown) formed on the housing 104 to fix the holding cover 108 to the housing 104.

  On the other hand, as shown in FIG. 5B, the holding cover 8 of the present invention is integrally formed by molding with resin. It has almost the same shape as the conventional holding cover 108.

  As shown in FIG. 5 (c), the conventional insulator 106 is integrally formed by pressing a metal plate, and an elongated insulator body portion 106d and a bending line in which one end of the insulator body portion 106d is inclined. A protrusion 106a bent downward, an opposite end 106b obtained by bending the lever main body portion 106d into a U-shape, and a bearing portion 106e for passing the lever shaft.

  On the other hand, as shown in FIG. 5 (d), the insulator 6 of the present invention is integrally formed by molding with resin and extends as a whole in the same manner as the conventional insulator 106. Then, it is quite different from the conventional insulator 106. Hereinafter, a description will be given with reference to FIG.

  As shown in FIG. 6, the insulator 6 includes a protrusion 6a formed at one end, a U-shaped groove 6d positioned at the opposite end 6b for sandwiching the crank 7a, and a bearing hole 6e for passing the insulator shaft 6c. , One side arm 6f connecting between the bearing hole 6e and the protrusion 6a, and an opposite side arm 6g connecting between the bearing hole 6e and the opposite end 6b. The one-side arm 6f is formed with a stepped bottom surface, so that the thickness is obliquely reduced from the maximum thickness (vertical direction in the figure) at the position of the bearing hole 6e, becomes a constant thickness with a slightly thinner thickness, and further increases the thickness obliquely. The thickness is reduced to a constant thickness and reaches the protrusion 6a. Further, the upper surface of the one-side arm 6f has a constant height from the position of the bearing hole 6e to the protrusion 6a, but a rib 6h is formed extending in the width direction from the position of the bearing hole 6e to the protrusion 6a. Yes.

  The opposite arm 6g has a flat bottom surface from the position of the bearing hole 6e to the position around the round bottom of the U-shaped groove 6d, but from the position around the round bottom of the U-shaped groove 6d to the opening position of the U-shaped groove 6d. Has a slope. The U-shaped groove 6d is also slightly inclined. Further, a rib 6i extending from the position of the bearing hole 6e to the opposite end 6b is formed on the upper surface of the opposite arm 6g.

  As the one-side arm 6f approaches the boundary with the projection 6a, the lower surface of the one-side arm 6f is curved downward so that the thickness of the one-side arm 6f gradually increases. Thereby, a radius 6j is formed at an inner corner portion sandwiched between the one-side arm 6f and the protrusion 6a.

  The mechanical strength of the insulator 6 varies depending on the resin material itself (which will be described later), but also depends on the structure. The structure of FIG. 6 is obtained in consideration of mechanical contact (interference) with other members (see FIG. 3) in the housing 4 while increasing the mechanical strength as much as possible. That is, the insulator 6 functions as a lock when the protrusion 6a engages with the window 5 of the cage 3 (see FIG. 2). If the optical package 1 is forcibly extracted in this locked state, a force is applied to the insulator 6 in the direction in which the protrusion 6a rises, and the one-side arm 6f tends to bend upward. With respect to this force, it is clear that the strength can be increased if the one-side arm 6f is made thicker overall (wider and thicker).

  However, as shown in FIG. 3A, a partition plate 39 that partitions the transmission and reception receptacles 13 is present above the insulator 36. Therefore, if the thickness of the insulator 6 is increased too much, it interferes with the partition plate 39 when the insulator 6 rotates. Alternatively, if the thickness of the insulator 6 is increased too much, the insulator 6 protrudes into the path of the optical connector and obstructs insertion of the optical connector. If the width of the insulator 6 is increased too much, it interferes with the receptacle 13 when the insulator 6 rotates. When the vertical position of the insulator 6 is lowered to avoid these interferences, the lower surface of the insulator 6 interferes with the bottom surface of the cage 3. Therefore, as shown in FIG. 6, the lower surface of the one-side arm 6f is made higher than the lower surface of the opposite arm 6g to avoid the bottom surface of the cage 3, and the upper surface of the one-side arm 6f is fleshed with ribs 6h only in the center in the width direction without the receptacle 13. It is. Since the lower surface of the opposite arm 6g does not enter the cage 3, even if it is lowered, it does not interfere with the bottom surface of the cage 3.

  Summarizing the above characteristics of the insulator 6, the insulator 6 is provided with a lever shaft 6c at a position where it does not enter the cage 3, and the head 6c from the lever shaft 6c with respect to the one side arm 6f positioned on the cage 3 side from the lever shaft 6c. The opposite arm 6g on the side of the portion 4a is formed stepwise toward the outside of the housing 3 (the side where the cage 3 has the hole 5; the lower side in the illustrated example), and the hole 5 of the cage 3 is formed at the tip of the one-side arm 6f. By forming the protrusion 6a extending toward the upper side, even if the lever shaft 6c is disposed on the outer side of the casing 3 (lower side in the illustrated example), the one-side arm 6f swings the lever 6 in a swinging posture (protrusion). From the posture when 6a is in the hole 5 to the posture when the projection 6a is not in the hole 5, the inside of the cage 3 is entered.

  On the other hand, when the lever 6 is rotated, the lower surface of the opposite arm 6g is lowered relatively large particularly at the opposite end 6b. Therefore, an inclined portion 6k is formed on the lower surface of the opposite arm 6g near the U-shaped groove 6d. The inclined portion 6k is lowered downward when the insulator 6 is rotated counterclockwise, but the protruding portion is lower than the case where the opposite arm 6g is straight without attaching the inclined portion 6k. Less. On the other hand, if the wall thickness on the lower side of the U-shaped groove 6d becomes thin due to the influence of the inclination, the crank 7a becomes weak against the force when rotating counterclockwise (during the unlocking operation), so the U-shaped groove 6d. The wall is also tilted to ensure thickness. The crank 7a fitted in the U-shaped groove 6d is also set so that the initial posture (when locked) is at the same angle as the U-shaped groove 6d.

  Summarizing the above characteristics of the insulator 6, the insulator 6 faces the opposite end 6b, which is the tip of the opposite arm 6g, inward of the casing 3 (in the illustrated example, the insulator 6 is located below the casing 3). Therefore, an inclined portion 6k inclined upward is formed, and a U-shaped groove 6d is formed as a crank groove for guiding the crank 7a along the inclination of the inclined portion 6k.

  The resin material of the insulator 6 preferably has a mechanical strength equal to or higher than that of the conventional SUS insulator 106 in the structure of FIG. Super engineering plastic is a resin material with high mechanical strength. Therefore, as a resin material for the insulator 6, 10 to 40% of glass fiber was mixed in polyetherimide, which is a kind of super engineering plastic, in order to increase the strength.

  The insulator 6 having the structure shown in FIG. 6 is actually made using polyetherimide, and the amount of warpage of the one-side arm 6f is compared with that of a conventional SUS insulator 106. Was 0.68 mm, whereas the deformation of the insulator 6 of the present invention was 0.29 mm.

  Also, in the course of this experiment, it was found that if the internal angle formed by the one side arm 6f and the projection 6a is a right angle at the boundary between the lower surface of the one side arm 6f and the projection 6a, stress concentrates on that portion. The portion 6j was reinforced as a build-up on this part. The radius 6j has a radius of 0.5 mm, for example.

  With the structure and material of the insulator 6 described above, 9 kgf or more, which is a required specification for the pull-out force and breakage resistance, was satisfied, and 11 kgf could be achieved.

  Next, another embodiment of the present invention will be described.

  So far, the case where the entire casing 4 is made of an electrically insulating material has been described. However, the present invention can also be applied to a case in which the housing 4 is made of a metal material and the head 4a is coated with an insulating film. That is, as shown in FIG. 10, in the optical transceiver 21 according to the present invention, the housing 22 is divided into a base body 23 and an exterior body 24, and one end of the base body 23 is a head 24a. After attaching the optical module 25 and the substrate 26 to the base body 23 and then inserting the base body 23 into the exterior body 24, the transceiver 21 is assembled.

  The casing 22 is made of a metal material for both the base body 23 and the exterior body 24. However, for the purpose of blocking external static electricity, the head 24a is coated with an insulating film by cation coating or the like. At this time, if attachment members such as the metal insulator 36, lever 37, and holding cover 38 described in FIG. 3 are incorporated in the head 24a, these attachment members impair electrostatic resistance. End up.

  Therefore, even in the configuration as shown in FIG. 10, if the insulator and the holding cover (not shown) are made of an electrically insulating material, the effect of increasing electrostatic resistance can be obtained as in the above-described embodiment.

It is a sectional side view of the optical transceiver which shows one Embodiment of this invention. FIG. 3 is a partially enlarged view of FIG. 2. (A)-(e) is explanatory drawing of the structure and discharge test using the perspective view of the head periphery of the conventional optical transceiver. It is a conceptual diagram of a test facility for static electricity resistance. (A) is a perspective view of the conventional holding cover, (b) is a perspective view of the holding cover of the present invention, (c) is a perspective view of a conventional lever, and (d) is a perspective view of the lever of the present invention. It is a side view of the insulator of this invention. It is a perspective view of the transmission apparatus which mounts an optical transceiver. It is the side cross-section part enlarged view of the conventional optical transceiver. It is sectional drawing which shows the internal structure around the optical element of the optical transceiver of this invention. It is a disassembled perspective view of the optical transceiver which shows other embodiment of this invention.

Explanation of symbols

1 Optical transceiver 3 Cage 4 Case 5 Hole 6 Insulator 7 Lever 8 Holding cover

Claims (10)

  A housing inserted into the transmission device from the outside of the transmission device, an engagement member having one end engaged with a hole provided in the transmission device to lock the housing to the transmission device, and the housing An optical transceiver comprising an optical element incorporated in the optical transceiver, wherein the engaging member is made of an electrically insulating material.   A casing that is inserted into a cage in the transmission apparatus from the outside of the transmission apparatus and a part (referred to as a head) remains outside the transmission apparatus, and a hole provided in the cage for locking the casing to the cage A swinging member that engages with one end of the swinging member and swings around the shaft, a lever that is connected to the shaft of the swinging member and that is positioned on the surface of the head, An optical transceiver comprising: an optical element located at a position; and at least the swing member is made of an electrically insulating material, and the swing member has a predetermined pull-out resistance.   A casing that is inserted into a cage in the transmission apparatus from the outside of the transmission apparatus and a part (referred to as a head) remains outside the transmission apparatus, and a hole provided in the cage for locking the casing to the cage A lever that engages at one end thereof, a crank that swings the opposite end of the lever that extends into the head, a lever that is connected to the shaft of the crank and is positioned on the surface of the head, An optical transceiver comprising: a holding cover that covers the shaft and the shaft of the crank and holds the insulator and the lever in the housing; and an optical element that is built in the housing and is located in the transmission device. An optical transceiver comprising an insulator made of an electrically insulating material.   The lever is provided at a position where the lever shaft does not enter the cage, and an opposite arm on the head side from the lever shaft with respect to the one side arm positioned on the cage side from the lever shaft is provided on the casing. Even if the lever shaft is arranged closer to the outside of the housing, the one-sided arm is formed by forming a projection formed stepwise toward the outside and extending toward the hole of the cage at the tip of the one-sided arm. 4. The optical transceiver according to claim 3, wherein said optical transceiver is placed inside said cage irrespective of the swinging posture of said insulator.   The insulator is a crank that forms an inclined portion inclined inward of the housing at the tip of the opposite arm on the head side from the insulator shaft, and guides the crank along the inclination of the inclined portion. 5. The optical transceiver according to claim 3, wherein a groove is formed.   The insulator is formed with a protrusion extending toward the hole of the cage at the tip of the one-side arm located on the cage side from the insulator shaft, and stress is concentrated on an inner angle formed by the one-side arm and the protrusion. The optical transceiver according to claim 3, wherein a built-up portion that relaxes the above is formed.   7. The optical transceiver according to claim 3, wherein the holding cover is made of an electrically insulating material.   8. The optical transceiver according to claim 3, wherein the insulator is made of polyetherimide.   9. The optical transceiver according to claim 3, wherein the casing is made of an electrically insulating material.   9. The optical transceiver according to claim 3, wherein the casing is made of a metal material, and at least a part of the casing remaining outside the transmission device is coated with an insulating film.

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