Surface mount IC socket

Abstract

To provide an inexpensive surface-mount IC socket that allows for easy detection of whether or not there are foreign objects inside. [Solution] The surface mount IC socket 1 includes a housing 2, a plurality of socket terminals 3, and a specular reflective portion MR. The housing 2 includes a peripheral wall 20 having a front wall 21 and a rear wall 22 having a mounting surface P on which the IC body 11 is placed on its upper surface, and a pair of side walls 23, and a side viewing hole SIH formed in the peripheral wall 20. When the IC body 11 is placed on the mounting surface P, an internal space S is formed that is covered by the peripheral wall 20 and the IC body 11. The plurality of socket terminals 3 each include leads 32 that are soldered to the surface of the substrate. The specular reflective portion MR is held inside the housing 2, and it is possible to determine whether or not there is foreign matter in the internal space S by viewing it from the outside through the side viewing hole SIH.

Description

Technical Field

[0001] The present invention relates to a surface mount IC socket.

Background Art

[0002] For example, in a gaming machine, an illegal act of inserting a foreign object such as an illegal IC package or illegal memory in which control information for illegally operating the gaming machine is stored between a regular IC package and an IC socket has been confirmed. Therefore, an IC socket that can observe the internal state of the socket main body from the outside of the IC socket holding the regular IC package has been proposed.

[0003] For example, in the IC socket disclosed in Patent Document 1, socket terminals arranged in two rows are arranged in a socket main body made of a transparent or translucent insulating material with a confirmation gap larger than the arrangement interval of the socket terminals at at least one location in each row. The inside of the socket main body can be visually recognized through the confirmation gap of the transparent or translucent socket main body.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the IC socket disclosed in Patent Document 1, DIP type socket terminals are used. If SMT type socket terminals are used in the IC socket, the socket body (insulating housing) is required to have heat resistance that can withstand the high heat of reflow. However, there is no inexpensive insulating material that is transparent or translucent and has heat resistance as the material for the socket body.

[0006] If the inside of the socket body is to be inspected through a viewing gap made of an opaque material, foreign objects located in areas far from the viewing gap within the socket body cannot be seen. Therefore, it is difficult to determine whether or not there are foreign objects inside.

[0007] One embodiment of the present invention provides an inexpensive surface-mount IC socket that allows for easy determination of whether or not there is foreign matter inside. [Means for solving the problem]

[0008] One embodiment of the present invention provides a surface mount IC socket (1;1Q;1R;1T;1U) for holding and mounting an IC package (10) on a substrate, which is configured such that a plurality of IC terminals (12) are arranged in two rows, front and rear, protruding downward from both the front and rear sides of a rectangular plate-shaped IC body (11). The surface mount IC socket includes a housing (2), socket terminals (3), and a specular reflector (MR). The housing includes a peripheral wall (20) having a front wall (21) and a rear wall (22) on which the IC body is placed, and a pair of side walls (23), and a viewing hole (SIH;CIH) formed in the peripheral wall. When the IC body is placed on the aforementioned mounting surface, the housing forms an internal space (S) that is covered by the peripheral wall and the IC body. The plurality of III can be distinguished. Furthermore, this distinction can be achieved inexpensively without using expensive transparent or translucent materials for the housing.

[0009] The alphanumeric characters in parentheses represent the corresponding components in the embodiments described later, but this does not mean that the present invention should be limited to those embodiments. The same applies hereafter in this section.

[0010] In one embodiment, the device further comprises a pair of first reinforcing tabs (4) each held by a pair of side walls. Each of the pair of first reinforcing tabs includes a first reinforcing tab body (40) held by the corresponding side wall and a first substrate connection portion (41) soldered to the surface of the substrate. At least one of the pair of first reinforcing tabs includes a first extension plate (43) extending inclined with respect to the fitting direction from the first reinforcing tab body and having the specular reflective portion on its surface (43a). The viewing hole includes a side viewing hole (SIH) formed in the side wall to which the first reinforcing tab, including the first extension plate, is fixed. The specular reflective portion of the first extension plate is configured to allow determination of whether or not there is foreign matter in the internal space by viewing it from the outside through the side viewing hole.

[0011] This configuration, with its simple structure of providing a first extension plate having a specular reflective surface on the first reinforcing tab, makes it easy to determine from the outside whether or not there are foreign objects in the internal space.

[0012] In one embodiment, the first extension plate of the first reinforcing tab includes a plurality of plate portions (44, 45, 46) each having a specular reflective portion facing in a different direction from one another. With this configuration, a wide area of ​​the internal space can be viewed from the outside using the plurality of specular reflective portions provided on the first extension plate and facing in different directions from one another. This improves the accuracy of determining whether or not there is foreign matter in the internal space.

[0013] In one embodiment, the device further comprises a pair of second reinforcing tabs (5) held in the front wall and the rear wall, respectively. Each of the pair of second reinforcing tabs includes a second reinforcing tab body (50) held in the middle of the corresponding wall in the left-right direction of the front wall and the rear wall, and a second substrate connection portion (51) soldered to the surface of the substrate. At least one of the pair of second reinforcing tabs includes a second extension plate (53) extending from the second reinforcing tab body parallel to the surface of the substrate, with the specular reflective portion provided on its surface (53a). The viewing hole includes an intermediate viewing hole (CIH) formed in the middle of the corresponding wall in the left-right direction of the front wall and the rear wall. The specular reflective portion of the second extension plate is configured to allow determination of whether or not there is foreign matter in the internal space by viewing it from the outside through the intermediate viewing hole.

[0014] This configuration, with its simple structure of providing a second extension plate having a specular reflective surface on the second reinforcing tab, makes it easy to determine from the outside whether or not there are foreign objects in the internal space.

[0015] In one embodiment, the structure further comprises a bridging plate (6) connecting the lower parts of the pair of side walls, the bridging plate having the specular reflective portion on its surface. The viewing hole includes an intermediate viewing hole formed in the middle of at least one of the front wall and the rear wall in the left-right direction. The specular reflective portion of the plate is configured so that it is possible to determine whether or not there is foreign matter in the internal space by viewing it from the outside through the intermediate viewing hole.

[0016] With this configuration, the image projected onto the specular reflective surface of the bridge plate can be viewed from the outside through an intermediate viewing hole formed in the middle section in the left-right direction. Therefore, it is easy to determine from the outside whether or not there are foreign objects in the internal space.

[0017] In one embodiment, the bridging plate includes a plurality of plate portions (63, 64, 65) each having specular reflective portions facing in different directions. With this configuration, a wide area of ​​the internal space can be viewed from the outside using the plurality of specular reflective portions provided on the bridging plate. This improves the accuracy of determining whether or not there are foreign objects in the internal space.

[0018] In one embodiment, the conductive shell (8) further includes a conductive shell body (80) covering the peripheral wall of the housing, a third substrate connection portion (81) soldered to the surface of the substrate, and a third extension plate (83) extending from the conductive shell body and having a specular reflective portion on its surface. With this configuration, a simple structure is provided in which a third extension plate with a specular reflective portion is attached to the conductive shell, and it is easy to determine from the outside whether or not there is foreign matter in the internal space.

[0019] In one embodiment, the third extension plate of the first reinforcing tab includes a plurality of plate portions (84, 85, 86) each having a specular reflective portion facing in a different direction from the others. With this configuration, a wide area of ​​the internal space can be easily seen from the outside. Therefore, the accuracy of determining whether or not there is foreign matter in the internal space can be improved.

[0020] In one embodiment, the specular reflective portion is composed of at least one of a mirror-finished portion, a metal plating layer, a metal tape (MT), and a metal film (MF). With this configuration, it is possible to determine whether or not there is foreign matter in the internal space by visual inspection from the outside, with a simple structure.

[0021] In one embodiment, the specular reflective portion includes a plurality of specular reflective portions facing in different directions from one another. With this configuration, a wide area of ​​the internal space can be easily viewed from the outside. Therefore, the accuracy of determining whether or not there is foreign matter in the internal space can be improved. [Brief explanation of the drawing]

[0022] [Figure 1]FIG. 1 is a plan view of a surface mount IC socket according to the first embodiment of the present invention on which an IC package is mounted. [Figure 2A-2B] FIG. 2A and FIG. 2B are respectively a front view and a bottom view of a surface mount IC socket on which an IC package is mounted. [Figure 3A-3B] FIG. 3A and FIG. 3B are cross-sectional views of a surface mount IC socket on which an IC package is mounted. FIG. 3A corresponds to a cross-sectional view taken along IIIA-IIIA in FIG. 1, and FIG. 3B corresponds to a cross-sectional view taken along IIIB-IIIB in FIG. 1. [Figure 4] FIG. 4 is a plan view of a surface mount IC socket. [Figure 5A-5B] FIG. 5A and FIG. 5B are cross-sectional views of a surface mount IC socket. FIG. 5A corresponds to a cross-sectional view taken along VA-VA in FIG. 4, and FIG. 5B corresponds to a cross-sectional view taken along VB-VB in FIG. 4. [Figure 6] FIG. 6 is a broken perspective view of a surface mount IC socket on which an IC package is mounted. [Figure 7A-7C] FIG. 7A, FIG. 7B and FIG. 7C are respectively a plan view, a front view and a side view of a first reinforcing tab. [Figures 8A-8C] FIG. 8A, FIG. 8B and FIG. 8C are perspective views of a first reinforcing tab from different angles. [Figure 9A-9B] FIG. 9A and FIG. 9B are respectively a plan view and a front view of a surface mount IC socket according to the second embodiment of the present invention on which an IC package is mounted. [Figure 10A-10B] FIG. 10A and FIG. 10B are cross-sectional views of a surface mount IC socket according to the second embodiment on which an IC package is mounted. FIG. 10A corresponds to a cross-sectional view taken along XA-XA in FIG. 9A, and FIG. 10B corresponds to a cross-sectional view taken along XB-XB in FIG. 9A. [Figure 11A-11B] FIG. 11A is a broken perspective view of a surface mount IC socket according to the second embodiment. FIG. 11B is a plan view of a part of a second reinforcing tab. [Figure 12] FIG. 12 is a plan view of a surface mount IC socket according to the third embodiment of the present invention on which an IC package is mounted. [Figures 13A-13B]Figures 13A and 13B are a front view and a bottom view, respectively, of a surface-mount IC socket of the third embodiment on which an IC package is mounted. [Figure 14A-14B] Figures 14A and 14B are cross-sectional views of a surface-mount IC socket of a third embodiment on which an IC package is mounted. Figure 14A corresponds to the XIVA-XIVA cross-sectional view in Figure 12, and Figure 14B corresponds to the XIVB-XIVB cross-sectional view in Figure 12. [Figure 15] Figure 15 is a broken perspective view of a surface mount IC socket according to the third embodiment. [Figure 16] Figure 16 is a schematic cross-sectional view of the main part of a surface mount IC socket 1T of the fourth embodiment of the present invention on which the IC package 10 is mounted. [Figure 17] Figure 17 is a perspective view of the third extension plate of the conductive shell. [Figures 18A-18B] Figures 18A and 18B are schematic cross-sectional views of a surface-mount IC socket of the fifth embodiment, showing an example of a modified specular reflection section. [Modes for carrying out the invention]

[0023] Hereinafter, embodiments of the present invention will be described with reference to the drawings. (First Embodiment) Figure 1 is a plan view of a surface-mount IC socket 1 of the first embodiment of the present invention on which an IC package 10 is mounted. Figures 2A and 2B are a front view and a bottom view, respectively, of the surface-mount IC socket 1 on which the IC package 10 is mounted. Figures 3A and 3B are cross-sectional views of the surface-mount IC socket 1 on which the IC package 10 is mounted. Figure 3A corresponds to the IIIA-IIIA cross-sectional view in Figure 1, and Figure 3B corresponds to the IIIB-IIIB cross-sectional view in Figure 1.

[0024] As shown in Figures 1 and 2A, the IC package 10 is constructed with a rectangular plate-shaped IC body 11, from which multiple IC terminals 12 are arranged in two rows, front and back, protruding downwards. The surface mount IC socket 1 includes an insulating housing 2, multiple conductive socket terminals 3 arranged in two rows, front and back, a pair of metal first reinforcing tabs 4, and a specular reflective portion MR. In the following description, the front-to-back direction X, the left-to-right direction Y, and the up-to-down direction Z (corresponding to the mating direction) will be described as three orthogonal directions.

[0025] Figure 4 is a plan view of a surface-mount IC socket. Figures 5A and 5B are cross-sectional views of the surface-mount IC socket. Figure 5A corresponds to the VA-VA cross-section in Figure 4, and Figure 5B corresponds to the VB-VB cross-section in Figure 4.

[0026] First, let's describe the housing 2. As shown in Figures 4, 5A, and 5B, the housing 2 includes a circumferential wall 20 which includes a front wall 21, a rear wall 22, and a pair of side walls 23. The front wall 21 includes an upper surface 21a, an upper protrusion 21b, a plurality of partition walls 21c, a plurality of terminal housing recesses 21d partitioned by the plurality of partition walls 21c, and a plurality of terminal fixing grooves 21e (see Figure 5B). The rear wall 22 includes an upper surface 22a, an upper protrusion 22b, a plurality of partition walls 22c, a plurality of terminal housing recesses 22d partitioned by the plurality of partition walls 22c, and a plurality of terminal fixing grooves 22e (see Figure 5B).

[0027] As shown in Figure 4, the upper protrusion 21b, which is part of the upper surface 21a of the front wall 21, and the upper protrusion 22b, which is part of the upper surface 22a of the rear wall 22, function as a mounting surface P on which the IC package 10 is placed (see also Figure 3A). As shown in Figure 3A, the housing 2 forms an internal space S that is covered by the peripheral wall 20 and the IC body 11 when the IC body 11 is placed on the mounting surface P.

[0028] As shown in Figures 2A, 4, and 5A, the upper surface 21a of the front wall 21 includes a recess 21f that extends from the middle of the left-right direction Y to the middle of the up-down direction Z. The upper surface 22a of the rear wall 22 includes a recess 22f that extends from the middle of the left-right direction Y to the middle of the up-down direction Z.

[0029] Each side wall 23 includes an upper surface 23a (see Figure 4), a lower surface 23b, and a pair of tab fixing grooves 23c. The pair of tab fixing grooves 23c are opposite each other in the front-rear direction X and each penetrates the side wall 23 in the up-down direction Z. The upper surface 23a of each side wall 23 forms a recessed area 23d that is recessed downwards in the middle of the front-rear direction X and inward in the left-right direction Y. The recessed area 23d is formed as an inclined surface whose height decreases inward in the left-right direction Y. A side viewing hole SIH is formed above the recessed area 23d of each side wall 23. The interior of the internal space S can be viewed through each side viewing hole SIH.

[0030] Next, the socket terminals 3 will be described. As shown in Figure 5B, each row of socket terminals 3 includes a socket terminal body 30, an IC terminal connection portion 31, and leads 32 that are soldered to the surface of the circuit board. The socket terminal body 30 of each row of socket terminals 3 extends in the vertical direction Z and is press-fitted and fixed into the corresponding terminal fixing groove 21e of the front wall 21 or the terminal fixing groove 22e of the rear wall 22. As shown in Figure 2B, the leads 32 of the front row of socket terminals 3 protrude forward from the front wall 21, and the leads 32 of the rear row of socket terminals 3 protrude backward from the rear wall 22.

[0031] The IC terminal connection portion 31 is formed by an elastic tongue supported by the socket terminal body 30, and is elastically fitted to the IC terminal 12 in the mating direction (up and down direction Z). Specifically, the IC terminal connection portion 31 includes a first folded portion 33, a first straight portion 34, a second folded portion 35, a second straight portion 36, a third folded portion 37, and a third straight portion 38.

[0032] The first folded portion 33 is folded downward from the upper end of the socket terminal body 30. The first straight portion 34 extends downward from the first folded portion 33. The second folded portion 35 is folded diagonally upward from the lower end of the first straight portion 34. The second straight portion 36 extends diagonally upward from the second folded portion 35. The third folded portion 37 is folded diagonally downward from the upper end of the second straight portion 36. The third straight portion 38 extends diagonally downward from the third folded portion 37. The third straight portion 38 is elastically contactable with respect to the first straight portion 34. As shown in Figure 3B, the IC terminal 12 is inserted and fitted between the first straight portion 34 and the third straight portion 38.

[0033] Next, the first reinforcing tab 4 will be described. The pair of first reinforcing tabs 4 have a symmetrical configuration, and a common member is used with a different orientation. Therefore, the description will be based on the left first reinforcing tab 4. Figures 7A, 7B, and 7C are the plan view, front view, and side view of the first reinforcing tab 4, respectively. Figures 8A, 8B, and 8C are perspective views of the first reinforcing tab 4 from different angles.

[0034] As shown in Figures 7A to 8C, the first reinforcing tab 4 includes a first reinforcing tab body 40, a first substrate connection portion 41, a curved folded portion 42, and a first extended plate 43 having a specular reflective portion MR on its surface. The first reinforcing tab 4 is formed by press forming of a metal plate. The first reinforcing tab body 40 is a rectangular plate extending in the front-rear direction X and the up-down direction Z, and is press-fitted and fixed into the tab fixing groove 23c of the side wall 23 of the housing 2. The first reinforcing tab body 40 includes an upper end 40a, a lower end 40b, a front end 40c, a rear end 40d, and press-fitted projections 40e projecting forward and backward from the front end 40c and the rear end 40d, respectively.

[0035] The first substrate connection portion 41 is a rectangular plate that extends perpendicularly outward in the left-right direction Y from the lower end 40b of the first reinforcing tab body 40 and is soldered to the surface of the substrate. The first extension plate 43 extends from the upper end 40a of the first reinforcing tab body 40 via a folded portion 42 in an inclined manner (diagonally downward; see Figure 7C) with respect to the fitting direction (up-down direction Z). The first extension plate 43 is supported by a recess 23d of the corresponding side wall 23. The first extension plate 43 includes a plurality of plate portions.

[0036] Specifically, as shown in Figures 7A and 8B, the first extended plate 43 includes a rectangular central plate portion 44, a rectangular front plate portion 45 extending in a bent shape from the front edge 44f of the central plate portion 44, and a rectangular rear plate portion 46 extending in a bent shape from the rear edge 44r of the central plate portion 44. The surface 44a of the central plate portion 44, the surface 45a of the front plate portion 45, and the surface 46a of the rear plate portion 46 each include specular reflective portions MR facing in different directions from each other.

[0037] The specular reflective portion MR is composed of at least one of a mirror-finished portion, a metal plating layer, a metal tape, and a metal film. That is, the specular reflective portion MR may be a mirror-finished portion in which the surface 43a of the first extension plate 43 of the first reinforcing tab 4 is mirror-finished. Alternatively, the specular reflective portion MR may be formed from a metal plating layer (not shown; for example, a chrome plating layer) on the surface 43a of the first extension plate 43. Alternatively, the specular reflective portion MR may be formed from a metal tape (not shown) or a metal film (not shown) attached to the surface 43a of the first extension plate 43.

[0038] According to this embodiment, as shown in Figure 3A, by visually observing the image transferred to the specular reflecting part MR through the peephole (side peephole SIH) from the outside, it is possible to easily determine whether or not there is foreign matter in the internal space S by visual inspection from the outside. Foreign matter located in areas of the internal space S far from the peephole (side peephole SIH) can also be visually observed. Furthermore, this determination can be achieved inexpensively without using expensive transparent or translucent materials for the housing 2.

[0039] Furthermore, with a simple structure in which a first extension plate 43 having a specular reflective portion MR is provided on the first reinforcing tab 4, it is possible to easily determine from the outside whether or not there is foreign matter in the internal space S.

[0040] Furthermore, as shown in Figure 8B, the first extension plate 43 of the first reinforcing tab 4 includes a plurality of plate portions (central plate portion 44, front plate portion 45, and rear plate portion 46) each having a specular reflective portion MR facing in different directions. With this configuration, a wide area of ​​the internal space S can be visually inspected from the outside using the plurality of specular reflective portions MR provided on the first extension plate 43 and facing in different directions. This improves the accuracy of determining whether or not there is foreign matter in the internal space S.

[0041] The first extension plate 43 may be formed from two plate sections, or from four or more plate sections. Alternatively, the first extension plate 43 may be formed from a single plate section.

[0042] Furthermore, the specular reflective portion MR is composed of at least one of a mirror-finished portion, a metal plating layer, a metal tape, and a metal film. Therefore, with a simple structure, it is possible to determine from the outside whether or not there is foreign matter in the internal space S. (Second Embodiment) Figures 9A and 9B are a plan view and a front view, respectively, of a surface mount IC socket 1Q of a second embodiment of the present invention on which an IC package 10 is mounted. Figures 10A and 10B are cross-sectional views of the surface mount IC socket 1Q on which the IC package 10 is mounted. Figure 10A corresponds to the XA-XA cross-sectional view in Figure 9A, and Figure 10B corresponds to the XB-XB cross-sectional view in Figure 9A. Figure 11A is a broken perspective view of the surface mount IC socket 1Q. Figure 11B is a plan view of a part of the second reinforcing tab.

[0043] The main differences between the surface mount IC socket 1Q of the second embodiment and the surface mount IC socket 1 of the first embodiment are as follows: As shown in Figures 9A and 9B, the housing 2 includes an intermediate viewing hole CIH above the recess 21f of the front wall 21 and the recess 22f of the rear wall 22. Also, as shown in Figures 10A and 10B, the surface mount IC socket 1Q includes a pair of second reinforcing tabs 5 held by the front wall 21 and the rear wall 22, respectively. As shown in Figure 10B, each second reinforcing tab 5 includes a second reinforcing tab body 50, a second substrate connection portion 51, an inverted extension portion 52, and a second extension plate 53 positioned diagonally below the corresponding intermediate viewing hole CIH.

[0044] As shown in Figure 10B, the second reinforcing tab body 50 is a rectangular plate extending in the left-right direction Y and the up-down direction Z. The second reinforcing tab body 50 of a pair of second reinforcing tabs 5 are press-fitted and fixed into tab fixing grooves 21g in the middle of the left-right direction Y of the front wall 21 and tab fixing grooves 22g in the middle of the left-right direction Y of the rear wall 22, respectively. The second reinforcing tab body 50 includes an upper end 50a, a lower end 50b, a pair of side ends (not shown), and press-fitted projections (not shown) protruding from each of the side ends.

[0045] The second substrate connection portion 51 is a rectangular plate extending perpendicularly outward in the front-rear direction X from the lower end 50b of the second reinforcing tab body 50, and is soldered to the surface of the substrate. The inverted extension portion 52 is a rectangular plate extending downward inverted from the upper end 50a of the second reinforcing tab body 50. The second extension plate 53 is a plate extended from the second reinforcing tab body 50 via the inverted extension portion 52. The second extension plate 53 extends perpendicularly inward in the front-rear direction X from the lower end 52a, which is the extension end of the inverted extension portion 52. The second extension plate 53 extends parallel to the front-rear direction X and the left-right direction Y. The surface 53a (upper surface) of the second extension plate 53 includes a specular reflection portion MR.

[0046] The specular reflective portion MR is composed of at least one of a mirror-finished portion, a metal plating layer, a metal tape, and a metal film. That is, the specular reflective portion MR may be a mirror-finished portion in which the surface 53a of the second extension plate 53 of the second reinforcing tab 5 is mirror-finished. Alternatively, the specular reflective portion MR may be formed from a metal plating layer (not shown; for example, a chrome plating layer) on the surface 53a of the second extension plate 53. Alternatively, the specular reflective portion MR may be formed from a metal tape (not shown) or a metal film (not shown) attached to the surface 53a of the second extension plate 53.

[0047] As shown in Figure 11B, the second extension plate 53 includes a narrow portion 531 connected to the lower end 52a of the inverted extension portion 52, a wide portion 532 wider than the narrow portion 531, and a width-increasing portion 533 between the narrow portion 531 and the wide portion 532. The narrow portion 531 has the same width as the inverted extension portion 52 with respect to the left-right direction Y. The width-increasing portion 533 is between the narrow portion 531 and the wide portion 532, and its width gradually increases toward the wide portion 532.

[0048] As shown in Figure 11A, the specular reflective portion MR on the surface 53a of the second extension plate 53 is configured to allow for the determination of whether or not there is foreign matter in the internal space S by visual inspection from the outside through the intermediate viewing hole CIH. With this configuration, a simple structure is provided in which the second extension plate 53 having the specular reflective portion MR is attached to the second reinforcing tab 5, and the presence or absence of foreign matter in the internal space S can be easily determined by visual inspection from the outside.

[0049] The second extension plate 53 having a specular reflective portion MR may be provided on at least one of the pair of second reinforcing tabs 5. (Third embodiment) Next, Figure 12 is a plan view of a surface-mount IC socket 1R of a third embodiment of the present invention on which an IC package 10 is mounted. Figures 13A and 13B are a front view and a bottom view, respectively, of the surface-mount IC socket 1R on which the IC package 10 is mounted. Figures 14A and 14B are cross-sectional views of the surface-mount IC socket 1R on which the IC package 10 is mounted. Figure 14A corresponds to the XIVA-XIVA cross-sectional view of Figure 12, and Figure 14B corresponds to the XIVB-XIVB cross-sectional view of Figure 12. Figure 15 is a broken perspective view of the surface-mount IC socket 1R.

[0050] The surface mount IC socket 1R of the third embodiment differs from the surface mount IC socket 1 of the first embodiment mainly in the following ways. Specifically, as shown in Figures 13B and 14A, the surface mount IC socket 1R includes a metal bridging plate 6 that connects the lower parts of a pair of side walls 23 of the housing 2 and has a specular reflective portion MR on its surface. Also, as shown in Figures 12 and 13A, the housing 2 includes an intermediate viewing hole CIH above the recess 21f of the front wall 21 and the recess 22f of the rear wall 22.

[0051] As shown in Figures 13B, 14A, and 14B, the bridging plate 6 includes a bridging plate body 60 that extends longitudinally in the left-right direction Y and has a specular reflective portion MR on its surface 60a, a pair of end fixing portions 61, and a pair of intermediate fixing portions 62.

[0052] The bridging plate body 60 includes a central plate portion 63, a front plate portion 64 extending diagonally downward and forward from the central plate portion 63, and a rear plate portion 65 extending diagonally downward and backward from the central plate portion 63. The front plate portion 64 and the rear plate portion 65 are provided in pairs. The surfaces 63a of the central plate portion 63, 64a of the front plate portion 64, and 65a of the rear plate portion 65, which are the surfaces of the bridging plate body 60, include specular reflective portions MR that face in different directions from each other. The specular reflective portions MR of the bridging plate body 60 are configured so that it is possible to determine whether or not there is foreign matter in the internal space S by viewing them from the outside through the intermediate viewing hole CIH.

[0053] The specular reflective portion MR is composed of at least one of a mirror-finished portion, a metal plating layer, a metal tape, and a metal film. That is, the specular reflective portion MR may be a mirror-finished portion in which the surface 60a of the crosslinking plate body 60 is mirror-finished. Alternatively, the specular reflective portion MR may be formed from a metal plating layer (not shown; for example, a chrome plating layer) on the surface 60a of the crosslinking plate body 60. Furthermore, the specular reflective portion MR may be formed from a metal tape (not shown) or a metal film (not shown) attached to the surface 60a of the crosslinking plate body 60.

[0054] The pair of end fixing portions 61 extend upward perpendicularly from a pair of ends (longitudinal ends) in the left-right direction Y of the central plate portion 63 of the bridge plate body 60. The pair of end fixing portions 61 are press-fitted and fixed into fixing grooves 23e of a pair of side walls 23 (see Figure 15).

[0055] The pair of intermediate fixing portions 62 extend in an angle shape from both the front and rear sides of the intermediate portion in the left-right direction Y of the central plate portion 63 of the bridge plate body 60. The pair of intermediate fixing portions 62 are press-fitted and fixed into corresponding fixing grooves (not shown) of the front wall 21 and the rear wall 22.

[0056] As shown in Figure 14A, a pair of reinforcing tabs 7 are fixed to each of the pair of side walls 23. The reinforcing tab 7 (see Figure 8A) has the same configuration as the first reinforcing tab 4, but with the folded portion 42 and the first extension plate 43 removed. Also, as shown in Figure 12, the pair of side viewing holes SIH are not provided.

[0057] According to this embodiment, the image projected onto the specular reflection portion MR of the bridging plate 6 can be viewed from the outside through the intermediate viewing hole CIH formed in the middle of the left-right direction Y. Therefore, it is easy to determine from the outside whether or not there is foreign matter in the internal space S.

[0058] Furthermore, the bridging plate 6 includes multiple plate sections (central plate section 63, front plate section 64, and rear plate section 65) each having specular reflective sections MR facing in different directions. With this configuration, a wide area of ​​the internal space S can be visually observed from the outside using the multiple specular reflective sections MR provided on the bridging plate 6. Therefore, the accuracy of determining whether or not there are foreign objects in the internal space S can be improved.

[0059] The crosslinking plate body 60 of the crosslinking plate 6 may be formed from two plate sections, or from four or more plate sections. Alternatively, the crosslinking plate body 60 may be formed from a single plate section. (Fourth Embodiment) Figure 16 is a schematic cross-sectional view of the main part of a surface mount IC socket 1T of the fourth embodiment of the present invention on which an IC package 10 is mounted. Figure 17 is a perspective view of the third extension plate 83 of the conductive shell 8.

[0060] As shown in Figure 16, the surface mount IC socket 1T includes a conductive shell 8. The conductive shell 8 includes a rectangular annular conductive shell body 80 that covers the periphery 20 of the housing 2, a third substrate connection portion 81, an inverted extension portion 82, and a third extension plate 83. The third substrate connection portion 81 extends outward perpendicularly from a part of the lower end of the conductive shell body 80 and is soldered to the surface of the substrate. The third extension plate 83 extends from the upper end of the conductive shell body 80 via the inverted extension portion 82 in an inclined manner with respect to the fitting direction (vertical direction Z). A specular reflective portion MR is provided on the surface 83a of the third extension plate 83.

[0061] The specular reflective portion MR is composed of at least one of a mirror-finished portion, a metal plating layer, a metal tape, and a metal film. That is, the specular reflective portion MR may be a mirror-finished portion in which the surface 83a of the third extension plate 83 of the conductive shell 8 is mirror-finished. Alternatively, the specular reflective portion MR may be formed from a metal plating layer (not shown; for example, a chrome plating layer) on the surface 83a of the third extension plate 83. Alternatively, the specular reflective portion MR may be formed from a metal tape (not shown) or a metal film (not shown) attached to the surface 83a of the third extension plate 83.

[0062] With this configuration, a simple structure is provided in which a third extension plate 83 having a specular reflective portion MR is attached to the conductive shell 8, making it easy to determine from the outside whether or not there is foreign matter in the internal space S.

[0063] Furthermore, as shown in Figure 17, the third extended plate 83 includes a rectangular central plate portion 84, a rectangular front plate portion 85 extending in a bent shape from the front edge 84f of the central plate portion 84, and a rectangular rear plate portion 86 extending in a bent shape from the rear edge 84r of the central plate portion 84. The surface 84a of the central plate portion 84, the surface 85a of the front plate portion 85, and the surface 86a of the rear plate portion 86 each include specular reflective portions MR facing in different directions from each other.

[0064] With this configuration, a wide area of ​​the internal space S can be viewed from the outside by using multiple specular reflectors MR provided on the third extension plate 83 and facing in different directions. Therefore, the accuracy of determining whether or not there are foreign objects in the internal space S can be improved. The third extension plate 83 may be formed from two plate sections, or from four or more plate sections. Alternatively, the third extension plate 83 may be formed from a single plate section.

[0065] The present invention is not limited to each of the above embodiments. For example, the specular reflector portion MR may be formed from a metal tape or metal film attached to the surface of a resin member such as the housing 2. For example, in the surface mount IC socket 1U of the fifth embodiment of the present invention, a metal tape MT (see Figure 18A) or metal film MF (see Figure 18B) attached to the surface (upper surface 23a) of the side wall 23 of the housing 2 is used as the specular reflector portion MR. In addition, the present invention can be modified in various ways within the scope of the claims. [Explanation of Symbols]

[0066] 1: Surface mount IC socket 1Q: Surface mount IC socket 1R: Surface mount IC socket 1T: Surface mount IC socket 1U: Surface mount IC socket 2: Housing 3: Socket terminals 4: First reinforcement tab 5: Second reinforcement tab 6:Bridge plate 8: Conductive shell 10: IC package 11: IC main unit 12:IC terminal 20: Peripheral wall 21: Front wall 22: Back wall 23: Side wall 40: First reinforcing tab body 41: First board connection section 43: 1st extension plate 43a: surface 44:Central plate part 44a: Surface 45: Front plate part 45a: surface 46: Rear plate part 46a: Surface 50: Second reinforcing tab body 51: Second board connection section 53:Second extension plate 53a: surface 60: Main body of the cross-linking plate 60a: Surface 63:Central plate part 63a: surface 64: Front plate part 64a: surface 65: Rear plate part 65a: surface 80: Conductive shell body 81: Third board connection section 83: 3rd extension plate 83a: surface 84:Central plate part 84a: surface 84f: Leading edge 84r: trailing edge 85: Front plate part 85a: surface 86: Rear plate part 86a: surface CIH: Intermediate viewing hole MF: Metallic film MR:Specular reflection part MT: Metal tape P: Mounting surface S:Internal space SIH: Side viewing hole X: Anteroposterior direction Y: Left / right direction Z: Vertical direction

Claims

1. A surface mount IC socket for holding and mounting an IC package to a circuit board, the IC package being constructed in which multiple IC terminals are arranged in two rows, front and back, protruding downwards from both the front and back sides of a rectangular plate-shaped IC body, A housing comprising a front wall and a rear wall having a mounting surface on its upper surface on which the IC body is placed, a pair of side walls, a peripheral wall, and a viewing hole formed in the peripheral wall, wherein when the IC body is placed on the mounting surface described above, an internal space is formed that is covered by the peripheral wall and the IC body, A plurality of socket terminals, held by the front and rear walls of the housing and arranged in two rows, each including an IC terminal connection portion that is fitted in the mating direction to the corresponding IC terminal, and a lead that is soldered to the surface of the substrate, A surface mount IC socket comprising a mirror-like reflective portion held within the housing, which allows for the determination of whether or not there is foreign matter in the internal space by viewing it from the outside through the viewing hole.

2. The system further comprises a pair of first reinforcing tabs, each held by the pair of side walls, Each of the pair of first reinforcing tabs includes a first reinforcing tab body held in the corresponding side wall and a first substrate connection portion soldered to the surface of the substrate. At least one of the pair of first reinforcing tabs includes a first extending plate that extends inclined from the first reinforcing tab body with respect to the fitting direction and has the specular reflective portion on its surface, The viewing hole includes a side viewing hole formed in the side wall to which the first reinforcing tab, including the first extension plate, is fixed. The surface mount IC socket according to claim 1, wherein the mirror-reflective portion of the first extension plate is configured to allow determination of whether or not there is foreign matter in the internal space by viewing it from the outside through the side viewing hole.

3. The surface mount IC socket according to claim 2, wherein the first extension plate of the first reinforcing tab includes a plurality of plate portions, each having a specular reflective portion facing in a different direction from one another.

4. The system further comprises a pair of second reinforcing tabs held in the front wall and the rear wall, respectively. Each of the pair of second reinforcing tabs includes a second reinforcing tab body held in the middle of the corresponding front and rear walls in the left-right direction, and a second substrate connection portion soldered to the surface of the substrate. At least one of the pair of second reinforcing tabs includes a second extending plate that extends from the second reinforcing tab body and has the specular reflective portion on its surface, The viewing hole includes an intermediate viewing hole formed in the middle portion in the left-right direction of the corresponding wall between the front wall and the rear wall, The surface mount IC socket according to claim 1, wherein the mirror-reflective portion of the second extension plate is configured to allow determination of whether or not there is foreign matter in the internal space by viewing it from the outside through the intermediate viewing hole.

5. The system further comprises a bridging plate connecting the lower parts of the pair of side walls, with the mirror-like reflective portion provided on its surface, The viewing hole includes an intermediate viewing hole formed in the middle of at least one of the front wall and the rear wall in the left-right direction, The surface mount IC socket according to claim 1, wherein the mirror-reflective portion of the crosslinking plate is configured to allow determination of whether or not there is foreign matter in the internal space by viewing it from the outside through the intermediate viewing hole.

6. The surface mount IC socket according to claim 5, wherein the bridging plate includes a plurality of plate portions, each having a specular reflective portion facing in a different direction from the others.

7. The surface mount IC socket according to claim 1, further comprising a conductive shell including a conductive shell body covering the peripheral wall of the housing, a third substrate connection portion soldered to the surface of the substrate, and a third extension plate extending from the conductive shell body and having the specular reflective portion on its surface.

8. The surface mount IC socket according to claim 7, wherein the third extension plate of the conductive shell includes a plurality of plate portions, each having a specular reflective portion facing in a different direction from the others.

9. The surface mount IC socket according to any one of claims 1 to 8, wherein the specular reflective portion is composed of at least one of a mirror-finished portion, a metal plating layer, a metal tape, and a metal film.

10. The surface mount IC socket according to claim 1, wherein the specular reflective portion includes a plurality of specular reflective portions facing in different directions from each other.

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