JP2009016042A - Memory card socket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a memory card socket which improves holding force to a base body of a movable contact spring piece. <P>SOLUTION: The memory card socket includes: a socket body 3 where a memory card MC is slid and inserted/removed through a card insert slot opened on the front surface; an L-shaped resin base body 7 which holds a plurality of contacts 10 each contacting a plurality of I/O contact surfaces of the memory card MC and is arranged in the socket body 3; and movable metal contact plates 31A and 31B equipped with a press-fitting piece 31a whose both-side edges in width direction are press-fitted in the press-fitting groove of a side part 7b of the base body 7 and a contact spring part 31b which extends from one side edge in the width direction of the press-fitting piece 31a and is provided with a movable contact that contacts and comes off a fixed contact point on the tip side. The press-fitting piece 31a is formed so that it becomes symmetrical to the central axis in the width direction of a soldering terminal 31d for surface-mounting that extends from one side edge of the press-fitting piece 31a in the thickness direction of the socket body 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  In the present invention, a memory card such as an SD memory card (registered trademark) or a multimedia card (MMC), or an SDIO card having the same size and terminal arrangement as the SD memory card (registered trademark) is detachably connected. This relates to a memory card socket.

  Conventionally, it has a box shape with a card insertion slot at the front, and the socket body into which the memory card is slid out of the card insertion slot is inserted and integrated into the resin base disposed at the rear of the socket body by press fitting A plurality of contacts that are held and contact each of a plurality of I / O contact surfaces of the memory card, and are arranged in the socket body so as to be movable in the front-rear direction, and memory according to the insertion / extraction operation of the memory card from the card insertion slot A slider that moves in the front-rear direction together with the card, a coil spring that constantly biases the slider forward, a cam pin that has one end held by the socket body and the other end engaged in a heart cam groove provided in the slider, And a locking body that is attached to the slider and engages with a locking recess provided on a side surface of the memory card when the memory card is mounted. Ricardo socket is provided (for example, see Patent Document 1).

In this type of memory card socket, a movable contact provided with a movable contact that comes in contact with and separates from a fixed contact held by a base body by being pushed and bent by a memory card inserted into the socket body. Providing a detection switch for detecting the memory card insertion state with a movable contact and a fixed contact and a detection switch for detecting the write protection state of the memory card provided by pressing and fixing the fixed end of the plate to the base Has been.
JP 2003-217713 A

  In the conventional memory card socket described above, the above-described contact or movable contact plate is provided with a surface mounting terminal for surface mounting on the mounting substrate, but is provided on the movable contact plate and provided on the base. The press-fitting piece for press-fitting into the press-fitting groove was formed in an asymmetric shape with respect to the central axis in the width direction of the surface mounting terminal. Here, an external force that rotates the movable contact plate around the mounting position of the surface mounting terminal may be applied to the press-fit piece by inserting or removing the memory card into the socket body, but the shape of the press-fit piece is asymmetric. Due to the shape, there is a problem that the holding force of the press-fit piece is weak against an external force that rotates the press-fit piece.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a memory card socket in which the holding force of a movable contact plate to a base is improved.

  In order to achieve the above object, the invention of claim 1 is formed in a box shape having a card insertion slot opened on the front surface, and a socket body into which a memory card is slid and inserted through the card insertion slot. A plurality of contacts that respectively contact the plurality of I / O contact surfaces provided on the card, and a resin base disposed at the rear of the socket body with the plurality of contacts facing the card insertion slot side; A press-fit piece that has both edges in the width direction is press-fitted into the provided press-fit groove, and a movable contact that comes in contact with the fixed contact is provided on the free end side with the press-fit piece as a fixed end. And a metal movable contact plate that makes the movable contact come into contact with the fixed contact by being pushed and bent by the memory card inserted into the body, and the press-fitting piece of the movable contact plate has a thickness of the socket body. A surface mounting terminal that is surface-mounted on the mounting board is extended from one side edge in the direction, and the shape of the press-fit piece is symmetrical to the central axis in the width direction of the surface mounting terminal. It is formed.

  According to a second aspect of the present invention, in the first aspect of the present invention, the movable contact plate includes a contact spring portion extending from one end side in the width direction of the press-fitting piece and provided with a movable contact on the tip end side. The base is provided with a first abutting portion that abuts with a portion on the tip side in the press-fitting direction in the portion and a second abutting portion that abuts with a portion on the other end side in the width direction of the press-fitting piece. To do.

  According to a third aspect of the present invention, in the second aspect of the present invention, the first and second contact portions are provided in a portion of the substrate other than a portion through which the press-fitting piece passes when the press-fitting piece is press-fitted into the press-fitting groove. It is characterized by that.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a protruding piece protruding in the thickness direction is provided by cutting and raising a part of the press-fitting piece, and a guide groove into which the protruding piece is fitted is formed in the base body. It is provided.

  According to the first aspect of the present invention, since the left and right side edges of the press-fitting piece formed in a shape symmetrical to the center axis in the width direction of the surface mounting terminal are press-fitted into the press-fitting groove of the base body, Even if an external force that rotates the movable contact plate around the mounting position of the mounting terminal is applied to the press-fitted piece, the right and left side edges of the press-fitted piece receive the force evenly, increasing the holding strength against the base There is an effect that can be.

  According to the second aspect of the present invention, the first contact portion is brought into contact with the first contact portion in the press-fitting direction in the contact spring portion provided with the movable contact, and the other end portion in the width direction of the press-fit piece. And the second abutting part abut, the position of the contact spring part can be positioned, and even if the position of the movable contact is away from the press-fitting piece, the contact spring part is prevented from falling and movable. There is an effect that the positional accuracy of the contact can be increased.

  According to the invention of claim 3, when the press-fitting piece is press-fitted into the press-fitting groove, the first and second abutting portions are scraped by the press-fitting piece abutting on the first and second abutting portions. Can be prevented, and the positional accuracy of the movable contact can be improved.

  According to the invention of claim 4, when the press-fitting piece is temporarily press-fitted into the press-fitting groove, the press-fitting piece can be guided by fitting the protruding piece into the guide groove, and the movable contact plate is rotated after the press-fitting. When an external force is applied to the press-fitted piece, the projecting piece comes into contact with the end surface of the guide groove, thereby preventing the press-fitted piece from falling.

  Embodiments of the present invention will be described below with reference to FIGS. In the following description, the arrow ab in FIG. 2 will be described in the vertical direction, the arrow cd in the horizontal direction, and the arrow ef in the front-rear direction unless otherwise specified.

  FIG. 1 and FIG. 2 show an entire exploded perspective view and an overall perspective view of the present embodiment corresponding to a memory card MC such as an SD memory card (registered trademark). As shown in the drawing, a base shell 1 formed by punching and bending a very thin stainless metal plate, and punching and bending a very thin stainless metal plate similar to the base shell 1. A cover shell 2 comprising a base shell 1 and a flat box-shaped socket body 3 which is formed by processing and is attached to the base shell 1 so that a card insertion slot 3a is opened on the front surface; The contact block 4 mounted in the rear part of the contact block 4 and an L-shape arranged to be movable in the front-rear direction in the socket body 3 on the front side of the contact block 4 And a slider 5 made of a resin molded article is obtained by the major components.

  As shown in FIGS. 6 (a) and 6 (b), the base shell 1 has side pieces 6a and 6b formed by bending the rectangular plate-like metal plate on the left and right sides of the upper surface (corresponding to the inside of the socket body 3) in the side direction. The front and rear ends are open. At the rear end of the base shell 1, projecting pieces 9 projecting in the upper surface direction are bent into four in the left-right direction at a predetermined interval. At the left end of the base shell 1, projecting pieces 9 projecting in the upper surface direction are formed at a predetermined interval. The protrusions 9 are bent in the front-rear direction, and these protruding pieces 9 are press-fitted from below into a press-fitting groove 8 (see FIG. 8B) opened on the lower surface of the resin base 7 of the contact block 4. The contact block 4 is press-fitted and fixed to the upper surface of the base shell 1.

  Further, a plurality of holes 11 for releasing later-described contacts 10 held by the contact block 4 are formed slightly forward from the rear end of the base shell 1.

  A support piece 12 having an L-shape in side view is formed at the right end of the front edge of the base shell 1 so as to protrude upward from a position outside the passing position of the memory card MC, and further its front end protrudes rearward. A shaft portion 16b on one end side of a cam pin 16, which will be described later, is engaged with an engagement hole 12a provided on the upper surface of the support piece 12, and the cam pin 16 is pivotally supported with respect to the support piece 12. . Further, on the right edge of the base shell 1, ridges 13, 13 that fit into a groove 27 of the slider 5 to be described later and guide the slider 5 are formed by cutting them up in the front-rear direction. Further, on the left side of the front edge of the base shell 1, an engagement piece 1a that is engaged with a front end portion of a side portion 7b of a base body 7 described later is formed by bending.

  As shown in FIG. 8, the contact block 4 is disposed along the rear side of the base shell 1 and the cover shell 2, and includes a side portion 7a that closes the rear surface of the socket body 3, and a left end portion of the side portion 7a. It has a base body 7 made of an L-shaped resin molded product that projects forward and is integrally formed with a side portion 7b that is disposed along the side piece 6b of the base shell 1. A slider is located at the front right end of the side portion 7a. A round bar-like spring receiving projection 7c that holds one end of the coil spring 14 that biases 5 forward is projected, and a rectangular fitting projection 7e is projected from the right end of the upper surface of the side portion 7a. Yes. Further, the side portion 7b is integrally provided with a step portion 7d that extends along a sliding direction of the memory card MC from a connection portion with the side portion 7a and faces the back surface of the memory card MC. In addition, at the corner on the upper side (the cover shell 2 side) of the front surface of the side portion 7a, there are provided three engaging recesses 17 that are engaged with a protruding piece 20 of the cover shell 2 to be described later at intervals in the left-right direction. . In addition, an engagement recess 18 that engages with a bent piece 19 of the cover shell 2 described later is formed on the upper corner of the rear surface of the side portion 7a over substantially the entire left and right direction.

  Further, on the side portion 7a of the base 7, nine I / O contact surfaces (not shown) formed in parallel on the back surface of the rear portion of the memory card MC (nine in the SD memory (registered trademark)) are contacted correspondingly. The contacts 10 are press-fitted and fixed, and the contact side of each contact 10 is projected to the front surface (card insertion slot 3a) side of the side portion 7a. In addition, the press-fitting grooves 33, 34, 35 provided on the upper surface of the side portion 7b have the common terminal plate 30 having fixed contacts 41a, 42a and the memory card MC mounted together with the fixed contacts 41a provided on the common terminal plate 30, respectively. A movable contact plate 31A having a movable contact constituting a detection contact and a movable contact having a movable contact constituting a position detection contact of the write protect switch 100 of the memory card MC together with a fixed contact 42a provided on the common terminal plate 30. The contact plate 31B is press-fitted and fixed from the upper surface side. Note that the soldering terminals 10a of the contacts 10... Protrude upward (on the mounting board side) from the rear surface of the side portion 7a, and the soldering terminals 30a of the common terminal plate 30 and the soldering terminals of the movable contact plates 31A and 31B described later. (Surface mounting terminals) 31d and 31d protrude upward from the outer surface of the side portion 7b.

  The common terminal plate 30 is formed by punching and bending a strip-like sheet metal having elasticity, and soldering is L-shaped in a side view from the upper edge on one end side in the longitudinal direction. The piece 30a is protrudingly provided. Also, fixed contacts 41a and 42a having a dowel shape are provided on one end side in the longitudinal direction at the middle portion in the longitudinal direction and the upper edge on the other end side, and the middle portion in the longitudinal direction is bent outward. The other end side in the longitudinal direction of the contact plates 41 and 42 is connected. When the common terminal plate 30 is press-fitted and fixed in the press-fitting groove 33 of the base body 7, the end portions of the fixed contact plates 41 and 42 on the side where the fixed contacts 41a and 42a are formed are recessed portions 36 and 36 provided on the side portion 7b. (Refer to FIGS. 10 to 12).

  Next, the movable contact plates 31A and 31B will be described. Since the movable contact plates 31A and 31B are formed in the same shape, the movable contact plate 31A will be described with reference to FIGS. 14A to 14C, and the description of the movable contact plate 31B will be omitted. . The movable contact plate 31A is formed by punching and bending a metal plate having elasticity, and is provided on the base 7 with projecting portions 31g and 31g projecting laterally on the lower side portions of the left and right side edges. A rectangular plate-like press-fitting piece 31a that is press-fitted and fixed in the press-fitting groove 34, and protrudes laterally from the upper side of one end in the width direction of the press-fitting piece 31a (the right edge in FIG. 14A), and the tip side is substantially U A strip-shaped contact spring portion 31b curved into a shape, a solder terminal 31d having a substantially L-shape in side view extending from one side edge of the press-fit piece 31a in the thickness direction of the socket body 3, and a press-fit piece 31a A contact piece 31e that protrudes laterally from the upper side at the other end in the width direction, and a protruding piece 31f that is formed by cutting and raising the central portion of the press-fit piece 31a and whose upper end protrudes toward the inside of the socket body 3. I have. In the contact spring portion 31b, a V notch 31c that contacts the fixed contact 41a is formed at a position near the curved portion provided on the distal end side, and the fixed contacts 41a and 42a are formed from the position where the V notch 31c is formed. A movable contact that contacts and separates is configured. When the movable contact plates 31A and 31B are press-fitted into the press-fit grooves 34 and 35 opened on the upper surface of the base body 5, the curved portion provided on the distal end side of the contact spring portion 31b of each movable contact plate 31A and 31B becomes a side portion. 7b protrudes toward the inner side of the socket body 3 (on the side of the storage space of the memory card MC) through the recessed portion 36 (see FIGS. 10 to 12).

  Here, the soldering terminals 31d of the movable contact plates 31A and 31B are extended from one side edge of the press-fit piece 31a in the thickness direction of the socket body 3, and below the both side edges of the press-fit piece 31a in the width direction. Protrusions 31g and 31g projecting sideways are provided on the part, and the shape of the press-fitting piece 31a is formed in a symmetrical shape with respect to the central axis in the width direction of the soldering terminal 31d. Accordingly, each of the movable contact plates 31A and 31B has left and right side edges of the press-fitting pieces 31a formed in a symmetrical shape with respect to the central axis in the width direction of the soldering terminal 31d in the press-fitting grooves 34 and 35 of the base body 7. Even if an external force that rotates the movable contact plates 31A and 31B about the mounting position of the soldering terminal 31d is applied to the press-fit piece 31a, the left and right edges of the press-fit piece 31a are evenly applied. By receiving, the holding strength of the movable contact plates 31A and 31B with respect to the base body 7 can be increased.

  Each of the movable contact plates 31A, 31B includes a contact spring portion 31b that is extended from one end side in the width direction of the press-fitting piece 31a and has a movable contact provided on the tip end side, and is provided below the contact spring portion 31b. A rib (first contact portion) 37 that contacts an edge (a portion on the tip side in the press-fitting direction), and a rib (second contact portion) 38 that contacts a portion on the other end side in the width direction of the press-fit piece 31a. Is provided on the base body 7. When the movable contact plates 31A, 31B are press-fitted and fixed in the press-fit grooves 34, 35, the rib 37 contacts the lower edge of the contact spring portion 31b, and the press-fit piece 31a The rib 38 abuts against the end opposite to the side from which the contact spring portion 31b protrudes, so that the position of the contact spring portion 31b can be positioned, and even when the position of the movable contact is away from the press-fit piece 31a. The contact spring part 31b Sealed, it is possible to improve the positional accuracy of the movable contact. Moreover, since the ribs 37 and 38 are provided in the base 7 other than the part through which the press-fit piece 31a passes when the press-fit piece 31a is press-fitted into the press-fit grooves 34 and 35, the press-fit piece 31a is pressed. The ribs 37 and 38 can be prevented from being scraped, and the contact spring portion 31b can be reliably positioned to improve the positional accuracy of the movable contact.

  In addition, guide grooves 34a and 35a into which the protruding pieces 31f formed by cutting and raising a part of the press-fitting pieces 31a are formed on the end faces of the press-fitting grooves 34 and 35. , 35, when the projecting piece 31f fits into the guide grooves 34a, 35a, the press-fitting piece 31a can be guided, and an external force that rotates the movable contact plates 31A, 31B is press-fitted after the press-fitting. When added to the piece 31a, the projecting piece 31f abuts against the end surfaces of the guide grooves 34a and 35a, so that the press-fitting piece 31a (that is, the movable contact plates 31A and 31B) can be prevented from falling.

  On the other hand, the cover shell 2 is bent by bending the rear edge of the rectangular plate-shaped metal plate in a direction substantially perpendicular to the main surface, that is, the lower surface (corresponding to the inside of the socket body 3) as shown in FIG. A piece 19 (second abutment piece) is formed, and three projecting pieces 20 (first pieces) projecting in a direction substantially perpendicular to the main surface, that is, in a lower surface side, slightly closer to the front end than the bent piece 19. 1 contact piece) is formed by bending. A fitting hole 2b into which the fitting protrusion 7e of the base body 7 is fitted is provided on the right side of the rear portion of the cover shell 2. An L-shape projecting downward is formed on the front surface of the right edge of the cover shell 2. The weld piece 2a is bent.

  Further, the cover shell 2 is elastically brought into contact with the surface of the memory card MC to hold the memory card MC, and the SDIO type card is elastically contacted with a ground terminal provided on the upper surface of the SDIO card. The contact spring pieces 21, 21 are formed by punching and bending, and a shaft portion 16 b on one end side of the cam pin 16 is formed at a position facing the support piece 12 of the base shell 1 on the right end portion on the front side. A pressing piece 22 is formed by cutting and raising the shaft portion 16b to prevent the shaft portion 16b from falling off. Further, the shaft portion 16a on the other end side of the cam pin 16 is pressed and the tip end of the shaft portion 16a is uneven in a guide groove 15b described later. A T-shaped elastic contact spring piece 23 brought into contact with the surface 15c is formed by punching and bending. Further, a lock body 24 that engages with the locking recess 101 of the memory card MC when the memory card MC is mounted is punched and bent near the rear end of the right end portion of the cover shell 2. It is formed by. The lock body 24 is in the form of a long and narrow strip, and is substantially parallel to the side piece 6a of the base shell 1 and is connected to the cover shell 2 with the rear end portion bent and the front end portion bent inward. The engagement piece 24b is formed to extend forward from the front end portion of the piece 24a and the tip side is curved in an arc shape inward (see FIG. 7B).

  The slider 5 is a synthetic resin molded product, and as shown in FIG. 9, a side portion 5a that contacts the right edge of the memory card MC and a front edge of the memory card MC that protrudes laterally from the rear end of the side portion 5a. An inclined cut formed by dropping a corner on the right side of the front portion of the memory card MC at an entering corner surrounded by the side portion 5a and the side portion 5b. A contact portion 5c having an inclined surface in contact with the portion 102 on the front surface is formed. Further, on the inner side surface (the left side surface in FIG. 5A) of the side portion 5a, a step portion 5d that extends from the contact portion 5c along the sliding direction of the memory card MC and faces the back surface of the memory card MC is integrated. In preparation.

  On the other hand, on the lower surface of the side portion 5a, there is formed a narrow groove 26 having a substantially arc-shaped cross section having an outer side, a lower side, and a rear side opened from the rear end portion to the central portion. The other end of the coil spring 14 is housed, and the inner surface of the front end of the narrow groove 26 is a surface that receives the elastic force of the coil spring 14. Further, on the lower surface of the side portion 5a, both the front and rear sides and the lower side are opened, and a concave groove 27 into which the protruding portions 13 and 13 of the base shell 1 are engaged is formed along the front and rear direction. That is, when the assembly is completed, the slider 5 is restricted in moving direction by the main plane of the base shell 1, the side piece 6 a, the ridges 13 and 13, and the main plane of the cover shell 2, Further movement in the forward direction is restricted by contacting the front end portion of 5a. The slider 5 is urged forward by a coil spring 14, and the memory card MC is inserted into the socket body 3 so that the I / O contact surface of the memory card MC contacts the contact 10 and the memory card MC. The slider 5 slides between the position at which it can be removed from the socket body 3.

  Further, a heart cam groove portion 15 into which the shaft portion 16a of the cam pin 16 is movably engaged is formed on the upper surface of the front side portion of the side portion 5a, and a lock body provided in the cover shell 2 on the rear side of the heart cam groove portion 15. A concave groove 25 into which 24 is inserted is formed. As shown in FIGS. 9A and 9D, the heart cam groove portion 15 includes a heart cam 15a and a guide groove 15b formed in the peripheral portion of the heart cam 15a. When the slider 5 moves back and forth, the guide groove 15b and the uneven surface 15c formed on the bottom surface of the guide groove 15b guide the relative movement of the shaft portion 16a of the cam pin 16 in the guide groove 15b. It is like that. The front portion of the heart cam 15a is formed with a concave portion 15d opened to the front side, and the shaft portion 16a of the cam pin 16 is recessed when the pushing force of the memory card MC after the slider 5 is moved to the rearmost position is released. By fitting in 15d, the movement of the slider 5 in the forward direction is restricted, and the slider 5 is held at a predetermined position. Further, a protruding portion 29 protruding in the inner direction of the socket body 3 is formed on the front side portion on the right end surface of the groove 25 provided on the upper surface of the side portion 5a, and when the slider 5 moves to the predetermined position, The overhanging portion 29 presses the lever piece 24a of the lock body 24 to engage the tip portion (engagement piece 24b) of the lock body 24 into the lock recess 101 of the memory card MC, and When the slider 5 is moved to the take-out position, the overhanging portion 29 is separated from the lock body 24, so that the lock body 24 returns to the initial position, and the tip portion of the engagement piece 24b is withdrawn from the locking recess 101. It has become.

  In assembling this memory card socket, first, each contact 10 is press-fitted into a press-fitting hole opened on the rear surface of the base 7 and the common terminal plate 30 is press-fitted into a press-fitting groove 33 provided on the side 7 b of the base 7. After that, the movable contact plates 31A and 31B are press-fitted and fixed in the press-fitting grooves 34 and 35 provided in the side portion 7b, respectively. At this time, the contact spring portion 31b of the fixed contact plate 41 and the movable contact plate 31A is opposed to the rear recessed portion 36 provided on the side portion 7b with the contact spring portion 31b inside, and the side portion 7b, a contact spring portion 31b of the fixed contact plate 42 and the movable contact plate 31A is disposed so as to face each other with the contact spring portion 31b inside.

  Then, after assembling the contact block 4 by holding the contacts 10..., The common terminal plate 30 and the movable contact plates 31 </ b> A and 31 </ b> B on the base body 7, the base body 7 of the contact block 4 is placed on the upper surface of the base shell 1. Then, the base 7 is fixed to the base shell 1 by press-fitting the protruding piece 9 of the base shell 1 into the press-fit groove 8 opened on the lower surface of the base 7 (see FIG. 5B). At this time, the front end portion of the side portion 7b of the base body 7 is engaged with the engagement piece 1a of the base shell 1 to regulate the positional deviation of the front end portion of the side portion 7b. Then, with the one end side of the coil spring 14 inserted and held in the spring receiving projection 7c of the base body 7, the other end side of the coil spring 14 is inserted into the narrow groove 26, and the protrusion 13 of the base shell 1 is recessed. After the slider 5 is placed on the base shell 1 so as to be fitted in the groove 27, the shaft portion 16b on one end side of the cam pin 16 is engaged with the engagement hole 12a provided in the support piece 12 of the base shell. The shaft portion 16 a on the other end side of the cam pin 16 is engaged with the heart cam groove portion 15 of the slider 5. Thereafter, the cover shell 2 is bridged between the tip portions of both side pieces 6a and 6b of the base shell 1 with the fitting protrusion 7e of the base body 7 fitted in the fitting hole 2b of the cover shell 2. The base shell 1 and the cover shell 2 are joined by laser welding of the joining portions (the butted portions of the left and right side edges of the cover shell 2 and the tip portions of both side pieces 6a and 6b of the base shell 1), A box-shaped socket body 3 having a card insertion slot 3a opened at the front is formed, and the assembly of the memory card socket is completed (see FIGS. 2 and 5A). A narrow welding piece 12b is provided on the upper surface of the support piece 12 that is bent from the front side edge of the base shell 1, and projects toward the side. The weld piece 12b is welded to the cover shell 2. Since the support piece 12 is connected to the cover shell 2 by abutting the downward stepped portion of the piece 2a and joining by laser welding, the strength of the support piece 12 can be increased. In this assembled state, the slider 5 is urged by the coil spring 14 and pushed forward (to the card insertion slot 3a side), and the front end of the side portion 5a abuts on the support piece 12 of the base shell 1 to thereby move the slider. Further forward movement of 5 is restricted. In this state, one end of the cam pin 16 has moved to the position A (see FIG. 9A) at the rear end of the guide groove 15b.

  Here, the space between the support piece 12 of the base shell 1 and the side portion 7b of the base 7 corresponds to the card insertion slot 3a, and above the step portions 5d and 7d of the side portion 5a and side portion 7b of the slider 5. The dimension between the inner edges of the memory card MC is set to be slightly larger than the maximum width dimension on both sides of the memory card MC, and the dimension between the upper surface of the base shell 1 and the upward surfaces of the step portions 5d and 7d is set on the upper surface of the base shell 1. The size is slightly smaller than the height of the downward surface of the downward step 103 (see FIGS. 3 and 4) formed over the entire length in the front-rear direction on both side edges of the back surface of the memory card MC with the back side placed. In addition, the dimension between the inner edges of the side parts 5a and 7b below the step parts 5d and 7d is set to be slightly larger than the dimension of the both side widths below the downward step part 103 of the memory card MC.

  As a result, when the back surface (surface on which the I / O contact surface is formed) of the memory card MC is placed on the upper surface side of the base shell 1, the downward step portion 103 of the memory card MC becomes the step portion 5d of the side portions 5a and 7b, 7d so that the memory card MC can be inserted from the card insertion slot 3a, and the surface of the memory card MC (the surface opposite to the surface on which the I / O contact surface is formed) is reversed. When facing toward the upper surface side of the base shell 1, both side portions of the memory card MC on the base shell 1 side cannot pass between the inner edges of the two stepped portions 5d and 7d, which is due to an error in the front and back direction of the memory card MC. Incorrect insertion is prevented.

  Further, a stopper piece 11a is formed by cutting and raising on the inner edge of the front side (card insertion slot 3a side) of the right end hole 11 provided corresponding to the right end contact 10 in the base shell 1 (FIG. 6 ( b)). That is, when the memory card MC is inserted into the card insertion slot 3a in the normal direction, it is inserted through an opening of a groove (not shown) that leads to the I / O contact surface provided on the back surface of the memory card MC. Each contact 10 can move to the contact position. However, when the memory card MC is to be inserted with the front-rear direction reversed, the stopper piece 11a abuts on the front surface in the insertion direction to move further. This prevents the tip of each contact 10 from being damaged by hitting the front surface of the memory card MC insertion side.

  Next, the operation of inserting / removing the memory card MC into / from the memory card socket according to the present embodiment will be described. When the memory card MC is not attached, the slider 5 moves forward until the front end of the side portion 5a abuts with the support piece 12 of the base shell 1 under the elastic force of the coil spring 14. ing. In this state, the engagement piece 24b of the lock body 24 is retracted into the concave groove 25, and the distal end portion of the engagement piece 24b does not protrude inward from the inner side surface of the side portion 5a.

  From this state, when the memory card MC is inserted into the card insertion slot 3a of the socket body 3 with the front-rear direction and the front-back direction in the normal direction, the memory card MC is connected to the side 5a of the slider 5 and the side 7b of the base body 7. The downward stepped portions 103 and 103 on both sides of the lower surface of the memory card MC are placed on the upper side of the stepped portions 5d and 7d provided on the both side portions 5a and 7b. When the memory card MC is further inserted into the socket body 3, the inclined cut portion 102 provided on the right side of the front end portion of the memory card MC abuts against the contact portion 5c of the slider 5 and pushes the slider 5 backward. become. Thereafter, when the memory card MC is pushed further inward against the elastic force of the coil spring 14 applied to the slider 5, the slider 5 moves backward in cooperation with the movement of the memory card MC. By retreating the slider 5, the shaft portion 16a of the cam pin 16 is moved by the guide groove 15b to the lower side in FIG. 9A while being guided by the concave and convex surface 15c at the bottom of the guide groove 15b of the heart cam groove portion 15. (A) is moved to the position B in the middle (actually, the slider 5 is moved rearward so that the shaft portion 16a of the cam pin 16 moves forward in the guide groove 15b (lower in FIG. 9 (a)). Will be moved to). When the memory card MC is pushed to a position close to the position where the rear surface of the side portion 5b of the slider 5 contacts the front surface of the base body 7 of the contact block 4, the shaft portion 16a of the cam pin 16 reaches the position C where it contacts the front end portion of the guide groove 15b. In other words, it is impossible to push further. At this time, as the slider 5 moves rearward, the overhanging portion 29 provided on the inner end surface of the concave groove 25 abuts on the lever piece 24a of the lock body 24, and the lever piece 24a is bent inward of the socket body 3. Therefore, the engagement piece 24b of the lock body 24 protrudes inward from the inner surface of the side portion 5a and engages with the locking recess 101 of the memory card MC, thereby locking the memory card MC and the memory card. MC is prevented from falling off.

  When the pushing force applied to the memory card MC at this position is released, the slider 5 returns to the front together with the memory card MC due to the elastic force of the coil spring 14, but the shaft portion 16a of the cam pin 16 is guided by the guide groove. While being guided by 15b, it moves to a position D that fits into the recess 15d of the heart cam 15a. Therefore, when the shaft portion 16a of the cam pin 16 contacts the recess 15d of the heart cam 15a, further forward movement of the slider 5 is restricted, and the memory card MC locked by the lock body 24 also enters the socket body 3 at that position. Will stay.

  When the memory card MC moves to a predetermined position by being pushed in, the tip of each contact 10 projecting forward from the side portion 7a of the slider 5 becomes a corresponding I / O contact surface formed on the back surface of the memory card MC. It will contact sequentially. The movable contact plate 31A protruding inward from the inner side surface of the side portion 7b of the slider 5 is pushed by the tip of the memory card MC and comes into contact with the common terminal plate 30. 30 (that is, the contact for detecting attachment) is conducted, and this switch signal can be used to detect that the memory card MC has been inserted at the proper position by an external detection circuit (not shown). it can.

  Further, a concave portion 105 in which the knob 104 of the write protect switch 100 is exposed is provided on one side surface of the memory card MC corresponding to the movable contact plate 31B. The front part rides on the knob 104 or falls into the recess 105, and accordingly, between the movable contact plate 31B and the common terminal plate 30 (that is, the position detection contact of the write protect switch 100) is turned on / off. Since the switch is turned off, it is possible to detect whether or not the memory card MC is in the write protect state by using an external detection circuit (not shown) using this switch signal. In the present embodiment, the dowel-shaped fixed contacts 41a and 41b provided on the fixed contact plates 41 and 42 and the V notch 31c provided on the contact spring portion 31b are in contact with each other, as shown in FIG. Since it is a two-point contact, contact stability can be improved. Further, since the portion where the V notch 31c is formed in the contact spring portion 31b is inclined obliquely with respect to the card insertion / removal direction, the displacement amount of the portion where the V notch 31c is formed during card insertion can be increased. The effect of wiping can be enhanced. Further, in the standard of the memory card MC, the dimensional tolerance in the width direction is smaller than the dimensional tolerance in the thickness direction, and the contact spring portions 31b of the movable contact plates 31A and 31B are arranged on the card surface or from the width direction of the memory card MC. Since it is in contact with the write protect switch, the contact stability can be improved as compared with the case of contacting the card surface or the write protect switch from the thickness direction where the variation in dimensions is large.

  When the memory card MC inserted as described above is taken out from the socket, first, the rear portion of the memory card MC exposed to the outside is pushed in the insertion direction from the card insertion port 3a of the socket body 3, and the slider 5 together with the memory card MC is pushed. Is moved in the insertion direction. By this movement, the shaft portion 16a of the cam pin 16 is detached from the concave portion 15d of the heart cam 15a, and is guided by the guide groove 15b to exit rightward from the concave portion 15d, and moves to a position E in the guide groove 15b.

  Thereafter, when the pushing force of the memory card MC is released, the slider 5 moves forward by the elastic force of the coil spring 14. When the slider 5 moves forward, the shaft portion 16a of the cam pin 16 is guided by the guide groove 15b along with the movement of the slider 5 and passes through the position F in the guide groove 15b on the right side of the heart cam 15a. Move to position A at the rear end. Further, as the slider 5 moves in the forward direction, the protruding portion 29 of the slider 5 moves away from the lever piece 24a of the lock body 24, so that the force to bend the lever piece 24a is lost and the lever piece 24a returns to the initial position. Since the tip of the engagement piece 24b is retracted into the concave groove 25 of the side portion 5a, the engagement state between the engagement piece 24b and the locking recess 101 is released, and the lock of the memory card MC is released. . Further, since the rear portion of the memory card MC is largely exposed to the outside from the card insertion port 3a of the socket body 3, the memory card MC can be taken out from the socket body 3.

  In the memory card socket of this embodiment, only one of the upper and lower metal shells (base shell 1 and cover shell 2) is press-fitted and fixed to the base 7 of the contact block 4, and the other cover shell 2 is The joining portion with the base shell 1 is joined by laser welding, and the force for press-fitting the cover shell 2 into the base body 7 is the same as when the cover shell 2 is press-fitted and fixed to the base body 7 on which the base shell 1 is press-fitted and fixed. Since the base shell 1 is not added, deformation of the base shell 1 can be prevented. Further, since the cover shell 2 is not press-fitted and fixed to the base body 7, the torsional force generated by the displacement of the press-fitted location is not applied to the cover shell 2 as in the case of press-fitting and the cover shell 2 is deformed. As a result, deformation of the socket body 3 is suppressed, and the flatness of the socket body 3 can be improved.

  Further, the cover shell 2 is not directly fixed to the base body 7 of the contact block 4, but the bent piece 19 provided at the rear end of the cover shell 2 contacts the engaging recess 18 provided on the rear surface side of the base body 7 from the rear side. The protruding piece 20 provided on the front end side slightly from the bent piece 19 is in contact with the engaging concave portion 17 provided on the front side of the base body 7 from the front side. Therefore, when a force that pushes the base 7 forward is generated by the frictional force generated between the I / O contact surface of the memory card MC and the contact 10 when the memory card MC is taken out, the upper part of the base 7 is moved forward. By receiving the pressing force with the protruding piece 20 of the cover shell 2, the base 7 can be prevented from falling forward. Further, even when the memory card MC is inserted, a force that pushes the base 7 backward is generated by the frictional force generated between the I / O contact surface of the memory card MC and the contact 10, but the top of the base 7 is pushed backward. By receiving the force with the bent piece 19 of the cover shell 2, the base 7 can be prevented from falling backward. Further, since the cover shell 2 is welded to the base shell 1 only on the left and right sides, the strength of the central portion is weakened, but a bent piece 19 that protrudes downward is formed at the rear edge of the cover shell 2 by bending. Therefore, the strength of the cover shell 2 can be increased by the bent piece 19.

  Further, in this embodiment, since the joining portion of the metal base shell 1 and the cover shell 2 is joined by laser welding, the base shell 1 and the cover shell 2 can be made completely at the same potential, and the base shell By grounding 1, the entire socket body 3 is securely grounded, so that it is resistant to static electricity and external noise, and EMI performance can be improved.

  In the present embodiment, the base 7 of the contact block 4 is press-fitted and fixed to the base shell 1 and the cover shell 2 is joined to the base shell 1 by laser welding. One of the two metal shells may be press-fitted and fixed to the base 7, and the other may be joined to one metal shell by laser welding. The cover shell 2 is press-fitted and fixed to the base 7, and the cover shell 2 and the base shell 1 may be joined by laser welding.

  Further, the memory card socket of the present embodiment includes the contacts 10..., The common terminal plate 30, the soldering terminals 10 a... 30 a and 31 d of the movable contact plates 31 A and 31 B, and the both side pieces 6 a and 6 b of the base shell 1. A stand-off socket in which the stepped portion of the mounting protrusion 6c protruding upward from the upper edge protrudes upward from the upper surface of the cover shell 2, and is surfaced on the mounting substrate in a state of floating from the substrate surface. By mounting, it is possible to mount components on the lower part of the socket body 3, but it goes without saying that the terminal structure may be in other forms. In this embodiment, the SD memory card (registered trademark) is described as an example of the memory card. However, the size of the portion inserted into the socket is formed to be the same size as the SD memory card (registered trademark). In addition, the SDIO card having the same terminal arrangement as that of the SD memory card (registered trademark) and equipped with an I / O interface, a PHS module, a GPS module, and other functional units can be used. That is, the memory card socket according to the present embodiment is an SD card socket compatible with both an SD memory card (registered trademark) and an SDIO card.

It is a disassembled perspective view of the socket for memory cards of this embodiment. It is an external appearance perspective view at the time of card extraction same as the above. FIG. 4A is a front view, FIG. 4B is a right side view, FIG. 4C is a left side view, FIG. 4D is a top view, and FIG. It is a rear view at the time of card mounting same as the above. (A) (b) is an external appearance perspective view same as the above. The base shell which comprises the same is shown, (a) is a top view, (b) is a perspective view. The cover shell which comprises the same is shown, (a) is the perspective view seen from the front side, (b) is the perspective view seen from the back side. The contact block which comprises the same is shown, (a) is the perspective view seen from the front side, (b) is the perspective view seen from the back side, (c) is a rear view. The slider which comprises the same is shown, (a) is a front view, (b) is a side view, (c) is a rear view, (d) is a perspective view. It is a top view of the state which removed the cover shell same as the above. It is a principal part expansion perspective view of the state which removed the cover shell same as the above. (A) is a principal part enlarged plan view of the state which removed the cover shell same as the above, (b) is CC sectional drawing. The common terminal board used for the above is shown, (a) is a front view, (b) is a top view, and (c) is a rear view. The movable contact plate used for the above is shown, (a) is a front view, (b) is a top view, and (c) is a rear view. It is a perspective view of the state which press-fits a movable contact plate to the base | substrate used for the same as the above. It is principal part sectional drawing explaining the contact state of the contact spring part and fixed contact of a movable contact plate used for the same as the above.

Explanation of symbols

3 Socket body 3a Card insertion slot 7 Base 7b Side 10 Contact 31A, 31B Movable contact plate 31a Press-fit piece 31b Contact spring (movable contact)
31c V notch (movable contact)
31d Soldering terminal (surface mounting terminal)
33, 34, 35 Press-fit groove MC Memory card

Claims (4)

A socket body that is formed in a box shape with a card insertion slot open on the front, and a memory card slides through the card insertion slot;
A resin base that holds a plurality of contacts that respectively contact a plurality of I / O contact surfaces provided on one surface of the memory card and that is disposed at the rear of the socket body with the plurality of contacts facing the card insertion slot side When,
A press-fitting piece, in which both side edges in the width direction are press-fitted into a press-fitting groove provided in the base body, is provided on the free end side with the press-fitting piece as a fixed end, and a movable contact that comes into contact with and away from the fixed contact. A metal movable contact plate that makes the movable contact come into contact with the fixed contact by being pushed and bent by the memory card inserted into the socket body,
The press-fitting piece of the movable contact plate is provided with a surface mounting terminal that is surface-mounted on the mounting board from one side edge in the thickness direction of the socket body, and the shape of the press-fitting piece is changed to the surface mounting terminal. A socket for a memory card, wherein the socket is formed symmetrically with respect to the central axis in the width direction.   The movable contact plate includes a contact spring portion extended from one end side in the width direction of the press-fitting piece and provided with a movable contact on the tip end side, and is in contact with a portion on the tip end side in the press-fitting direction in the contact spring portion. 2. The memory card socket according to claim 1, wherein a contact portion is provided on the base and a second contact portion that contacts a portion on the other end side in the width direction of the press-fitting piece.   3. The memory according to claim 2, wherein the first and second abutting portions are provided in a portion of the base other than a portion through which the press-fitting piece passes when the press-fitting piece is press-fitted into the press-fitting groove. Card socket.   4. A protruding piece protruding in the thickness direction is provided by cutting and raising a part of the press-fitting piece, and a guide groove into which the protruding piece is fitted is provided in the base body. Memory card socket.

Images