Abstract:
A card connector has a housing with a base and a side rail extending from the base to define a card-insertion cavity. A plurality of conductive terminals are supported by the housing and extend at least partially into the card-insertion cavity for contacting a card inserted into the card-insertion cavity. A push-push style card locking and ejection mechanism retains the card in the card-insertion cavity upon a first push and which ejects an inserted card upon a second push. The mechanism includes a slide member positioned for slidable movement on the side rail and a biasing member contacting the slide member for selectively exerting an ejection force on the slide member. The slide member includes a slide surface that slides along a guide surface of the side rail. A damping material is interposed between the slide member slide surface and the guide rail guide surface for retarding movement of the slide member on the side rail in response to an ejection force from the biasing member.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a card connector and more particularly to a card connector with an ejection damper. 
     2. Description of the Related Art 
     Conventionally, electronic equipment, such as a personal computers, portable or mobile telephones, PDAs (personal digital assistant), digital cameras, video cameras, music players, game machines, and car navigation systems, are equipped with card connectors adapted for use with various types of memory cards such as a SIM (subscriber identity module) card, an MMC® (multi media card), an SD® (secure digital) card, a mini SD® card, an xD picture card® (xD-Picture card), a memory stick®, a memory stick Duo®, a smart media®, a T-Flash (Trans-Flash) memory card, a micro SD® card, and the like. 
     Recent card connectors generally have, for ease of handling, a “push-push” structure in which a user handles a memory card so as to push it in order to both insert and discharge the card from a connector. However, with a card connector having the push-push structure, in discharging a card, the card is urged to slide by the repulsive force of a spring. This increases the travel speed of the card or a slide member holding the card, so that the card might dash or pop out or the slide member might collide with a stopper member resulting in mechanical shock. For this reason, there has been proposed such a technique that a speed reducer is used for slowing the travel speed of a card or a slide member down in discharging the card (for example, see Japanese Patent Application Laid-Open No. 2003-31307). 
       FIG. 7  is a schematic view illustrating a conventional card connector which includes a socket body  301  of a card connector, and a memory card (not shown) is inserted in direction “A.” The card connector has a slide cover  302  slidably mounted on the socket body  301 , and an eject unit (not shown) for discharging a memory card inserted between the socket body  301  and the slide cover  302 . The eject unit discharges a memory card by urging the slide cover  302  and the memory card to slide downwardly, as viewed in  FIG. 7 , by the repulsive force of a spring such as a torsion coil spring. The back of the socket body  301  is provided with a substrate  303  including for example electric terminals making contact with pads of the memory card, and a cable  304  connected to the substrate  303 . 
     A speed reducer  305  is disposed on one side of the socket body  301 . The speed reducer  305  has an oil damper  307  attached to a receptacle container  309  that houses therein the card connector, a gear  308  on which rotational resistance is exerted by the oil damper  307 , and a rack  306  that is formed on one side surface of the slide cover  302  to be engaged with the gear  308 . 
     With this construction, the speed reducer  305  can slow the travel speed of the slide cover  302  when a card is discharged from the card connector. This eliminates the possibility that the card is ejected too quickly, or that the slide cover  302  collides with a stopper member (not shown) thereby subjecting the card to mechanical shock. 
     The conventional card connector needs to have attached thereto, speed reducer  305  provided with oil damper  307 , gear  308 , and rack  306  rendering the structure somewhat complicated and increasing the cost. Moreover, disposition of the speed reducer  305  on the side of the socket body  301  increases the width of the card connector, thus making it difficult to miniaturize the card connector. 
     SUMMARY OF THE INVENTION 
     The present invention aims at overcoming the above-mentioned problems encountered by the conventional card connector, and makes it an object to provide a card connector configured in a manner such that a viscous dampening material such as a grease or other lubricant is applied between a slide surface of a guide member of a card guide mechanism, and a guide surface that guides the guide member. This material has the capability of exhibiting a damping effect provided by the lubricant when a slide member is returned by an urging member. Further, the stable damping effect can be attained by an additional arrangement such that an abutment part slidingly contacts with the inner side of a case thereby to limit its upward movement in order to maintain a spacing between the guide surface and the slide surface within a predetermined amount. This arrangement eliminates the necessity to separately dispose a mechanism for speed reduction, thus permitting a simple, low cost, and miniature structure. This arrangement also slows down the speed of the guide member during discharging of a card, so that a card is not permitted to be rapidly ejected toward the exterior, and reduces mechanical shock when the guide member is stopped. 
     Therefore, a card connector according to the present invention includes a housing that houses a card having an electric terminal member; an electric connecting terminal that is attached to the housing and comes in contact with the electric terminal member of the card; a case having a flat plate part that is attached to the housing; and a card guide mechanism that has a slide member to press a card inserted into the housing in a direction opposite to an insertion direction, and an urging member to urge the slide member in the opposite direction of the insertion direction of a card. When the slide member moves in the insertion direction and reaches a terminus by a push action that causes the slide member to stop at a lock position and causes the card to be pushed in the insertion direction, the slide member is caused by urging force of the urging member to move from the terminus in the opposite direction of the insertion direction to thereby allow the card to be discharged. The case covers with the flat plate part at least the slide member and a part of the inserted card. The housing has a guide surface that guides the slide member. The slide member has an engaging part that is able to engage the card, a slide surface that comes in slide contact with the guide surface, and an abutment part that opposes to the flat plate part of the case on the opposite side of the slide surface. The abutment part comes in slide contact with the flat plate part to thereby limit movement of the slide member toward the flat plate part, and a lubricant is applied between the guide surface and the slide surface so that the guide surface and the slide surface are in slidable contact with each other via the lubricant. 
     In another connector for card according to the present invention, due to application of the lubricant, the speed of traveling of the slide member that is moved from a terminus in the opposite direction of the insertion direction by the urging force of the urging member may be slowed down. 
     In still other connector for card according to the invention, the lubricant may be grease that is not more than 310 in consistency. 
     In still other connector for card according to the present invention, the slide surface is provided with at least one lubricant reservoir part for reserving the lubricant. 
     In still other connector for card according to the present invention, the guide surface is provided with at least one lubricant reservoir part for reserving the lubricant. 
     In still other connector for card according to the present invention, at least one side edge of the guide surface is provided with a partition-wall extending in the insertion direction and preventing the lubricant from flowing out of the connector for card. 
     In still other connector for card of the invention, the guide surface is further provided with a lubricant storage groove for storing the lubricant, adjoining the partition and extending in the insertion direction. 
     In still other connector for card of the invention, the engaging part holds a card at strength so as not to allow the card to slip from the slide member when discharging the card by causing it to move from a terminus in the opposite direction of the insertion direction. 
     In accordance with the present invention, lubricant is being applied between a slide surface of a guide member of a card guide mechanism for guiding a card inserted into a connector for card, and a guide surface for guiding the guide member. The damping effect owing to the lubricant is attainable when an urging member returns a slide member. Further, the stable damping effect is attainable by arranging such that an abutment part slidingly contacts the inner side of a case thereby to limit its upward movement in order to maintain the space between the guide surface and the slide surface within a predetermined amount. This arrangement eliminates the necessity to separately dispose a mechanism for speed reduction, thus permitting a simple structure, a low cost, and miniaturization. This arrangement also decreases the speed of the guide member in discharging a card, so that a card does not dash out, and no shock occurs when the guide member comes to a stop. 
     Another memory card connector according to the present invention may include a housing for receiving a memory card therein. The housing having a base portion and at least one side rail extending from the base portion to cooperatively define an interior space into which the memory card can be inserted by a user. The housing base portion supports a plurality of conductive terminals at least partially within the connector interior space. A slide member is provided for guiding a memory card into and out of the connector interior space with the slide member being slidable in first and second, opposite directions along the side rail. The slide member includes a slide surface that contacts and slides along the one side rail. A biasing member is provided to apply a biasing force to the slide member to urge the slide member in the second direction. A reservoir is interposed between the slide surface and the side rail with the reservoir including a viscous damping material having a consistency sufficient to at least partially retard a biasing force applied by the biasing member to a memory card located in the connector interior space to retard movement of the slide member and the memory card in the second direction. 
     If desired, the reservoir may be disposed in the one side rail. In addition, the viscous damping material may have a consistency of less than about 310 as measured according to Japanese Industrial Standard K2220-5.3.2. The viscous damping material may also have a consistency of no more than about 280 as measured according to Japanese Industrial Standard K2220-5.3.2. Still further, the viscous damping material may have a consistency between about 280 and about 310 as measured according to Japanese Industrial Standard K2220-5.3.2. The viscous damping material may be a torque grease. The viscous damping material may be contained within a packet which is disposed in the reservoir. In the alternative, the viscous damping material may include a viscous gel. 
     If desired, the reservoir of the card connector may include a first recess disposed in the slide rail. The reservoir may also include a plurality of recesses disposed in the slide rail. Still further, the recesses may be spaced apart from each other and arranged in a line along said side rail. The one side rail may include a guide surface that opposes the slide member slide surface and the reservoir is in contact with one of the slide surface and guide surface. The side rail may further include a barrier wall that separates the reservoir from the connector interior space. If desired, the first recess may be generally rectangular. The card connector may further include a second guide rail spaced apart from the one guide rail and the biasing member is disposed along the one guide rail. 
     Still another memory card connector according to the present invention may include a housing with a base and first and second spaced-apart side rails extending from the base to define a card-insertion slot therebetween. A plurality of conductive terminals are supported by the housing, and extend at least partially into the card insertion slot for contacting a card inserted into the card-insertion slot. A push-push style card locking and ejection mechanism is provided which retains a card in the card-insertion slot upon a first push and which ejects an inserted card upon a second push. The mechanism includes a slide member positioned for slidable movement on the first side rail and a biasing member contacting the slide member for selectively exerting an ejection force on the slide member. The slide member includes a slide surface that slides along a guide surface of the first side rail. A damping material is interposed between the slide member slide surface and the first guide rail guide surface for retarding movement of the slide member on the first side rail in response to the ejection force. 
     The damping material may have a consistency of no more than about 310 as measured according to Japanese Industrial Standard K2220-5.3.2. In the alternative, the damping material may have a consistency of no more than about 280 as measured according to Japanese Industrial Standard K2220-5.3.2. Still further, the first guide rail may include at least a first recess formed therein with the first recess containing the damping material. 
     The reservoir may include a plurality of recesses and the recesses may be arranged in a line along said first guide rail. The first guide rail may include a barrier wall separating the guide member guide surface from the card-insertion slot to substantially prevent migration of the damping material into the card-insertion slot. 
     Other objects, features and advantages of the present invention will be apparent from the following detailed description taken in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a card connector according to a first preferred embodiment of the present invention with a shell removed; 
         FIG. 2  is a perspective view of the card connector assembly of the present invention with a memory card aligned for insertion into the connector assembly; 
         FIG. 3A  is a perspective view of the card connector with an urging member and a pin member removed for clarity; 
         FIG. 3B  is a perspective view of the back or bottom of the slide member removed from the card connector; 
         FIG. 4  is a perspective view of the card connector with a slide member removed; 
         FIG. 4A  is a cross section of  FIG. 4 , taken along line A-A; 
         FIG. 4B  is a cross section similar to  FIG. 4A  of an alternate embodiment of the card connector; 
         FIG. 5  is an enlarged perspective view of a side arm of the card connector along which the slide member travels; 
         FIG. 6  is an enlarged perspective view of a side arm of a card connector according to a second preferred embodiment of the present invention; and 
         FIG. 7  is a somewhat schematic diagrammatic view illustrating a conventional card connector. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. 
     Referring first to  FIGS. 1 and 2 , a card connector, generally indicated at  10 , according to a first preferred embodiment is shown. Card connector  10  is configured to be attached to electronic equipment (not shown) and receive a card  31  therein, so that card  31  is attached via the card connector  10  to the electronic equipment. For example, the electronic equipment may be any type of equipment such as a personal computer, a portable or mobile telephone, a PDA, a digital camera, a video camera, a music player, a game machine, a car navigation system, or the like. 
     The card  31  may be any kind of card, for example, an IC card such as an SIM card, MMC®, an SD ® card, a mini SD® card, an xD picture card®, a memory stick®, a memory stick Duo®, a smart media®, a T-Flash memory card, a micro SD®, or the like. The first preferred embodiment describes the card  31  as a mini SD® card. In the following description, it should be understood that the expressions of respective directions such as up, down, left, right, front, and rear that are used to explain the construction and operation of respective parts of the card connector  10  are not absolute but relative expressions. That is to say, these expressions will be appropriate when the card connector  10  and its parts take up the position shown in the drawings. However, when they take another position, the description should be changed and interpreted according to a change in position of the card and its parts for purposes of understanding. 
     Referring now to  FIG. 2 , the card connector  10  has a housing  11  for housing a card  31  that is integrally formed by an insulating material such as synthetic resin, and a shell  12  as a case attached to the upper side of the housing  11 , which can be formed by subjecting a plate composed of a conductive material such as metal to the machining operation including punching, bending, and the like. A top surface  12   a  of the shell  12 , which is shaped like a flat plate, covers part of a card  31  inserted in the card connector  10  and covers slide member, indicated generally at  14 , over its entire working range. The card connector  10  in the general shape of a flat rectangular body is attached to the electronic equipment. The card  31  is inserted and removed from the front of the card connector  10  (on the right side as viewed in  FIG. 2 ) along axis “B.” Further description will be made with the card  31  inserted into the card connector  10  as shown in  FIG. 2 . such that electric contact pads  32  of card  31  face upwards to engage electric terminals  13  of connector  10 . 
     In  FIG. 1 , the shell  12  has been removed for clarity. Housing  11  has a bottom or lower wall  11   a  having such a shape that the front edge side (on the right and downward side as viewed in  FIG. 1 ), which is the front with respect to the insertion direction B of the card  31 , is formed in substantially a U-shape, and a rear wall  11   b  that extends along the rear edge at the connector  10  and stands vertical from the bottom wall  11   a . The rear wall  11   b  is provided with a plurality of terminal receiving or loading holes  11   e  formed so as to extend all of the way through rear wall  11   b  in a direction parallel to insertion direction B. A securing or root portion  13   a  of each terminal  13  engages each hole  11   e  to secure each of the terminals in a terminal loading hole  11   e . The terminals  13  extend toward the front edge of the housing  11 , and include contact portions  13   a  adjacent their tip portions and engage the contact pads  32  disposed on the upper surface of the card  31  thereby to establish electrical connection between the card connector  10  and card  31 . Each solder tail portion  13   c  extends from each of the root portions  13   a  of the terminals  13  and projects rearwardly from the rear edge of the bottom wall part  11   a , and is electrically connected by soldering or the like to a contact pad, or other counterpart electric terminal member, formed on a circuit member or board or the like and adapted to be mounted in some type of electronic equipment. 
     Housing  11  has a first side part or arm  11 c having an L-shaped cross-section and extending parallel to the insertion direction B along one side edge of the bottom wall  11   a , and a second side part or arm  11   d  extending parallel to the insertion direction B along the other side edge of the bottom wall part  11   a.    
     Card connector  10  is of the so-called “push-in/push-out” type or “push-push” type of card connector that requires the action of pushing a card  31  in inserting the card into the card connector  10  and in discharging the card  31  from the card connector  10 . Slide member  14  of the card guide mechanism is slidably attached to the second side arm  11   d  and configured for sliding movement in the insertion direction of the card  31  upon insertion of a card  31  into the card connector. 
     The slide member  14  has a first engaging part  14   b  and a second engaging part  14   d . The first engaging part  14   b  is integrally formed so as to project from an inner side surface of a slide cam  14   a  of the slide member  14 . A projecting engagement-claw  14   c  extends so as to project inwardly of the housing  11  is integrally formed at the tip of the first engaging part  14   b . The shape of the first engaging part  14   b  including the projecting engagement-claw  14   c  corresponds to the shape of the right corner portion at the leading end in the insertion direction of the card  31 , thus allowing for abutment of the front surface and the side surface of the right corner portion at the leading end in the insertion direction of a card  31  inserted in the card connector  10 . 
     A projection-like second engaging part  14   d  that projects inwardly of the housing  11  is integrally formed with a portion of the slide cam part  14   a  that extends rearward from the first engaging part  14   b  on the inner side surface of the slide cam part  14   a . The second engaging part  14   d  is configured to engage the side edge or surface  33  of card  31 . This enables the slide member  14  to engage the card  31  on both the front edge  34  and side edge  33  through the first and second engaging parts  14   b  and  14   d , and move together with the card  31  in the back-and-forth or insertion direction. 
     An urging member  15  in the form of a coil spring is mounted in the second side part  11   d  and urges slide member  14  forwardly, or away from rear wall  11   b . Opposite ends of the urging member  15  abut against a backstop  11   f  of the rear wall  11   b  and the rear end  14   k  of the slide cam  14   a , and are engaged with a first projection  11   g  projecting forwardly from the backstop  11   f  and a second projection  14   f  projecting rearwardly from the rear end  14   k  of the slide cam part  14   a.    
     One end of pin member  17  is engaged to an end or stopper part  11   h  formed at the front end of the second side part  11   d , and the other end of the pin member  17  is engaged with a cam groove  14   e  as a slide cam formed on the upper surface of the slide cam part  14   a . The pin member  17  cooperates with the cam groove  14   e  for permitting the slide member  14  to move together with the card  31  to perform push-push action as is known in the art. When the card  31  moves in the insertion direction and reaches the terminus by the pushing action of pushing the card in the insertion direction, the card guide mechanism causes the card  31  to move from the terminus in the opposite direction of the insertion direction to thereby discharge the card by the urging force of the urging member  15 . Since the cam mechanism for performing the push-push action (i.e., the interaction between the pin member  17  and the cam groove  14   e ) is well known, its description is omitted. 
     A first contact member  21  and a second contact member  22  are attached to the first side arm  11   c . The first and second contact parts  21  and  22  create closed and open circuits by electrically connecting to each other and separating from each other, respectively, thus functioning as a switch. The switch may be used as any kind of switch, such as a detection switch to detect that the card  31  is properly inserted into the card connector  10 , or a write protect switch to prohibit writing of new information into the card  31  as is known in the art. 
     Referring to  FIGS. 3A and 3B , the slide member  14  of the card guide mechanism has a flat slide surface  14   g  that is formed on the back of the slide cam part  14   a .  FIG. 3A  shows the connector  10  with urging member  15  and pin member  17  removed for clarity and  FIG. 3B  shows the back or bottom of slide member  14  removed from the housing  11 . 
     An upper surface  14   j  of slide member  14  is formed on the opposite side of the slide surface  14   g  of the first engaging part  14   b  and abuts the inside of the top surface  12   a  of the shell  12  with a slight clearance there between. When the slide member  14  moves, the upper surface  14   j  cooperates with the top surface  12   a  of the shell  12  to limit the upward movement of the slide member  14  thereby to prevent an increase in the clearance between the slide surface  14   g  and the guide surface  11   i . That is, maintaining the clearance formed between the slide surface  14   g  and the guide surface  11   i  at a predetermined amount stabilizes the damping effect. In order to allow the shell  12  to limit the upward movement of the slide member  14 , the first preferred embodiment utilizes a planar upper surface part  14   j  to abut shell  12 . In the alternative, the abutment surface may be formed by a plurality of projections or the like that are formed on slide member  14  and project upward to define the upper surface part  14   j.    
     The slide surface  14   g  is further provided with a first recess  14   h  functioning as a lubricant storage portion or reservoir portion. The first recess  14   h  has an opening into the slide surface  14   g , and it can reserve in its interior a lubricant such as grease. Although the shape of the opening of the first recess  14   h  is shown in  FIG. 3B  as a rectangle, it may be of any desired shape such as square, triangle, circle, ellipse, or the like. Although the number of the first recesses  14   h  illustrated in  FIG. 3B  is one, it may be two or more. Additionally, the position and layout of the first recesses  14   h  can be determined suitably. 
     The second side part or arm  11   d  has a flat guide surface  11   i  that is parallel to the bottom wall  11   a  and extends in the insertion direction B of the card  31 . Second side wall  11   j  that is perpendicular to the bottom wall part  11   a  and also extends in the insertion direction B. As best seen in  FIG. 5 , partition  11   k  is positioned at and defines a boundary between the bottom wall  11   a  and the guide surface  11   i , and is perpendicular to the bottom wall  11   a  and extends in the insertion direction B of the card  31 . 
     Slide member  14  slides along and is guided by guide surface  11   i  as it slides in the insertion direction. Partition  11   k  prevents slide surface  14   g  of slide member  14  from moving laterally and engaging bottom wall  11   a . The guide surface  11   i  has one or more second recesses  11   m  functioning as a lubricant storage portion or reservoir. The second recesses  11   m  have openings into the guide surface  11   i , and can store in its interior lubricant such as grease. Although the shape of the openings of the second recess  11   m  illustrated in  FIGS. 4 and 5  are circles, they may be of any desired shape such as rectangle, square, triangle, ellipse, or the like. Although the number of the second recesses  11   m  is three in the illustrated example, it may be one, two, four or more. Additionally, the position and layout of the second recesses  11   m  can be determined suitably. 
     The partition  11   k  projecting upward from the guide surface  11   i  also functions as a seal to prevent the lubricant on the guide surface  11   i  from traveling onto the bottom wall part  11   a . The partition  11   k  has a height to such a degree that the projecting engaging claw  14   c  and the second engaging part  14   d  of the slide member  14  are allowed to project inwardly of the housing  11  past the partition  11   k . Alternatively, the partition  11   k  may be formed on both sides of the guide surface  11   i  to create a U-shaped channel. In such an alternate embodiment, a track is created within which the slide member  14  slides. In the embodiment shown in  FIGS. 1-6 , slide member  14  is retained between shell  12  and guide surface  11   i.    
       FIG. 4A  is a cross-section of  FIG. 4 , taken along line A-A and it shows the general configuration of the guide surface  11   i  of the housing  11 . As shown therein, it can be seen that the housing includes a raised partition, or barrier wall,  11   k  that extends lengthwise along the extent of the housing. This raised wall serves as a barrier to the viscous damping material to substantially prevent the migration of the viscous damping material to the interior of the connector where it may contaminate the terminals  13 .  FIG. 4B  is a cross-section of an alternate embodiment of the side rail or member of the housing  11 , where the barrier wall has a stepped configuration. The wall rises up from the guide surface  11   i  to meet level with the bottom wall part  11   a.    
     In accordance with the first preferred embodiment, lubricant  16  ( FIG. 5 ) is applied between the guide surface  11   i  and the slide surface  14   g . If the lubricant is liquid of too low a viscosity, it will most likely flow off and around guide surface  11   i  and slide surface  14   g . Hence, preferably, the lubricant is grease that is relatively high in viscosity and low in flowability. 
     In the first preferred embodiment the primary objective of applying lubricant is to have the guide surface  11   i  and the slide surface  14   g  of the housing  11  function as a parallel-plate type viscous damper thereby to slow down the travel speed of the slide member  14  when it is moved from its fully inserted position in the opposite direction of the insertion direction of the card  31  by the urging force of the urging member  15 . Just as a viscous damper utilizes the viscosity resistance of viscous flow, and resistance force is proportional to velocity, the present invention uses the viscosity of the lubricant in a positive manner. The fluid used in a viscous damper is preferably high in viscosity. 
     Applying grease as a dampener between the guide surface  11   i  and the slide surface  14   g  will have the effects as set forth below. Since the travel speed of the card  31  when pushed by the user&#39;s hand and finger during insertion is low, the affect of the lubricant on the slide member  14  is likewise low and the lubricant barely increases the force required to insert the card  31 . On the other hand, when the force of the urging member  15  causes the slide member  14  to move in the opposite direction of the insertion direction thereby to discharge the card  31 , the travel speed of the slide member  14  moving together with the card  31  is higher, so that the lubricant has a greater affect and slide member  14  receives a larger resistive force due to the lubricant and the travel speed is slowed down. This prevents the card  31  from being expelled too quickly from the card connector  10  and also reduces mechanical shock when the slide member  14  engages the stopper part  11   h  and comes to a stop. 
     The function as a viscous damper can vary according to the characteristics of the grease. Therefore, the inventor of the present invention conducted an experiment by manufacturing the card connector  10  and using various types of grease at normal operating temperatures in order to specify the characteristic of grease that enables the speed of the slide member  14  to be reduced to an appropriate value. The characteristic of grease that corresponds to viscosity as the characteristic of lubricant is consistency. As used herein, the term “consistency” is a characteristic value indicating the hardness of the grease and the greater the number, the softer the grease. In general, a greater consistency means a lower apparent viscosity of the grease. As a further definition, consistency means the consistence of an extremely viscous substance to resist deformation. According to Japanese Industrial Standard JIS K2220-5.3.2, the consistency is determined such that: a cone having a predetermined shape (mass: 102.5±0.05 g) is moved perpendicularly into a sample for 5.0±0.1 seconds together with a holding section (mass: 45.50±0.02 g); the depth of movement obtained in the vertical direction in this procedure is measured; and a reading of the index is multiplied by 10. 
     The inventor carried out the experiment as to whether the speed of the slide member  14  could be reduced properly by using each of a plurality of greases that differed from one another in consistency. The results are shown in Table 1. 
     
       
         
               
               
               
               
             
               
               
               
               
               
             
           
               
                   
                 TABLE 1 
               
               
                   
                   
               
               
                   
                 A 
                 B 
                 C 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Consistency 
                 280 
                 290 
                 310 
               
               
                   
                 Goodness to 
                 excellent 
                 good 
                 good 
               
               
                   
                 connector 
               
               
                   
                   
               
             
          
         
       
     
     Every grease used in the experiment was torque grease manufactured by Sankei Kagaku Co., Ltd in Japan. The articles indicated by A, B, and C are the products called TGK-6, TGK-7, and TGK-8, respectively. Torque grease is used with machine parts, gears, and rotating parts, etc. that are made of metal or synthetic resin. The consistencies shown in Table 1 were measured according to JIS-K2220-5.3.2. In the experiment, approximately 400 mm 3  of grease was applied between the guide surface  11   i  and the slide surface  14   g  by using a dispenser. 
     It will be apparent from the results shown in Table 1 that it is desirable to use grease whose consistency is not more than 310, and more preferably not more than 280. A constant clearance between the guide surface  11   i  and the slide surface  14   g  stabilizes the amount of grease entering the clearance, thereby stabilizing the damping effect of the viscous damper. The damping effect can be adjusted by adjusting the dimension of the clearance and the amount of grease. 
     In operation, a user inserts card  31  from the front  15  of the card connector  10  by the hand and finger, or the like. The card  31  is inserted in the position as shown in  FIG. 2 , with respect to the card connector  10 . In the initial stage of insertion, the contact pads  32  of the card  31  have not yet reached the location of the terminals  13 . The right corner portion  34  at the leading end in the insertion direction of the card  31 , and the right side surface  33  are not engaged with the first engaging part  14   b  and the second engaging part  14   d  of the slide member  14  of the card guide mechanism. As shown in  FIG. 1 , the slide member  14  is stopped with its front end (adjacent second engaging part  14   d ), abutting against the stopper part  11   h . The first and second contact members  21  and  22  are not in contact, so that the detection switch is turned off. 
     Subsequently, when the user further pushes the card  31 , the engaging parts formed on the right corner portion  34  and the right side surface  33  at the leading end in the insertion direction of the card  31  engages with the first and second engaging parts  14   b  and  14   d , respectively, and the card  31  moves together with the slide member  14  toward the rear wall  11   b . At this time, the slide member  14  compresses the urging member  15  composed of a coil spring, so that the slide member  14  and the card  31  are moved against the spring force of the urging member  15 . The spring force is small enough that it is easily overcome by the push force developed by the user&#39;s hand and finger, or the like, as it is known in the art. 
     Grease is applied between the slide surface  14   g  of the slide member  14  and the guide surface  11   i  of the housing  11 , in order to achieve the function as a parallel-plate type viscous damper. Since the travel speed of the card  31  pushed by the user&#39;s hand and finger is low, the addition force caused by the damper on the slide member  14  moving together with the card  31  is very small. Accordingly, the presence of the grease does not significantly increase the force required by the user&#39;s hand and finger, nor does it cause a drop in the travel speed of the slide member  14  and the card  31 . Rather, the function as lubricant achieved by the grease reduces the friction between the guide surface  11   i  and the slide surface  14   g , thus allowing the slide member  14  to move smoothly. This enables the user to appreciate high-quality feeling when pushing the card  31 . 
     Thereafter, the slide member  14  and the card  31  reach the terminus that is the fully advanced position, and enter the full-stroke state. Near the middle of travel of the card  31 , its upper surface at the leading end  35  engages the lower projection of the first contact member  21  thereby to displace upward the body part of the first contact member  21 . As a result, the first abutment portion of the first contact member  21  is displaced upward and abuts the second abutment portion of the second contact member  22 , thus establishing continuity across the first and second contact members  21  and  22 . Through such a structure, the switch is turned on, designating that card  31  is inserted properly into the card connector  10 . 
     When the user stops the action of pushing the card  31  and releases the push force against the card  31 , the repulsive force of the urging member  15  causes the slide member  14  and the card  31  to move in the direction away from the rear wall  11   b . As is known in the art, the slide member  14  and the card  31  are thus stopped at an operative, locked position where the card  31  is held in the locked state in the card connector  10 . As is known in the art, the pin member  17  engages the cam groove  14   e  of the slide cam part  14   a  to stop the action of the slide cam part  14   a , thus stopping the slide member  14  at the locked position. 
     With the card  31  held at the locked position, data may be sent and received in the operative state with the electronic equipment to which the card connector  10  is attached. While the card  31  is held at the locked position, the contact pads  32  of the card  31  contact the contact portions  13   b  of the terminals  13  to maintain electrical continuity there between. Since the first contact part of the first contact member  21  is abutting the second contact part of the second contact member  22 , the detection switch is placed in the on state. 
     As is known in the art, a user removes card  31  by pushing the card  31  by the hand and finger, or the like, when it is in the operative, locked position. In doing so, the slide member  14  and the card  31  are moved from the locked position towards the rear wall  11   b . Further pushing of the card  31  causes the slide member  14  and the card  31  to reach the terminus that is the fully advanced position, and enter the full-stroke state. 
     Subsequently, when the user stops the action of pushing the card  31  and releases the pushing force against the card  31 , the repulsive force of the urging member  15  causes the slide member  14  and the card  31  to move in the direction away from the rear wall  11   b  and to return in the direction of the locked position. However, as it is known in the art, even as the slide member  14  reaches the locked position, the pin member  17  in cam groove  14   e  of the slide cam part  14   a  does not engage cam groove  14   e , and the slide member  14  and card  31  the locked position. 
     The repulsive force of the urging member  15  causes the slide member  14  and the card  31  to be ejected, thereby increasing the travel speed. This enables the slide surface  14   g  of the slide member  14 , the guide surface  11   i  of the housing  11  and the grease there between to function as a parallel-plate type viscous damper and supply resistive force to the slide member  14 , thereby reducing the travel speed of the slide member  14  and the card  31 . 
     Upon the abutment of the front end of the slide member  14  against the stopper part  11   h , the slide member  14  and the card  31  come to a stop. Since the travel speed of the slide member  14  and the card is lowered by the viscous action of the grease, the abutment of the front end of the slide member  14  against the stopper part  11   h  does not cause a large shock on the slide member  14  or the card  14 . Through such a structure, engagement is maintained between the engaging parts formed on the right corner portion  34  and the right side surface  33  of card  31 , and the first and second engaging parts  14   b  and  14   d  of the slide member  14  in the card guide mechanism. In other words, as the slide member  14  returns to the position as shown in  FIG. 1 , the card  31  will not dash out from the card connector  10  and is maintained in contact with the first and second engaging parts  14   b  and  14   d  of the slide member  14 . This reduces the possibility of losing the card  31 . 
     The force that the first and second engaging parts  14   b  and  14   d  of the slide member  14  exert on card  31  to temporarily hold the card in place is more than sufficient to maintain the card  31  in position within connector  11  when the slide member  14  is brought to a stop by engagement with the stopper part  11   h . It is, however, sufficiently less than the force that the user uses to pull the card  31  out of the connector  11  by the hand and finger, or the like. Therefore, the card  31  is temporarily held by the first and second engaging parts  14   b  and  14   d  of the slide member  14  until it is removed from the slide member  14  by pulling it with the user&#39;s hand and finger, or the like. 
     As the slide member  14  returns from the terminus to the position as shown in  FIG. 1 , the body part of the first contact member  21  returns by its own spring force to its original position. Accordingly, the first and second contact members  21  and  22  enter the non-continuity state, and the detection switch changes from the “on” state to the “off&#39; state. 
     Applying grease between the guide surface  11   i  and the slide surface  14   g  enables the guide surface  11   i  and the slide surface  14   g  to function as a parallel-plate type viscous damper. When the force of the urging member  15  causes the slide member  14  to move to eject the card  31 , the travel speed of slide member  14  and card  31  may be high, so that the damper provides a large resistance force on the slide member  14  and its travel speed is lowered. This prevents the card  31  from quickly dashing or springing out from the card connector  10 . This also prevents a large shock from occurring when the slide member  14  is brought to a stop by the abutment against the stopper  11   h . On the other hand, during the insertion process, a card  31  pushed by the user&#39;s hand and finger, or the like, has a low travel speed, so that the slide member  14  moving together with the card  31  receives very little additional resistive force from the damper. 
     At least one first recess portion  14   h  for storing grease is formed in the slide surface  14   g , and at least one second recess portion  11   m  for storing grease is formed in the guide surface  11   i . This enables a sufficient amount of grease to be held between the guide surface  11   i  and the slide surface  14   g . The presence of partition  11   k  extending in the insertion direction on at least one side edge of the guide surface  11   i  prevents the grease from flowing therearound and from in between the guide surface  11   i  and the slide surface  14   g.    
     Additionally, the first and second engaging parts  14   b  and  14   d  hold the card  31  with sufficient force so as to prevent card  31  from slipping from the slide member  14  when discharging the card  31 . This reduces the likelihood that the card  31  will dash out from the card connector  10 . Moreover, the card  31  can be easily removed from the slide member  14  by pulling it with the user&#39;s hand and finger, or the like. 
     While the first preferred embodiment has described only the case where the first recess portion  14   h  is formed on the slide surface  14   g  and the second recess portion  11   m  is formed on the guide surface  11   i , the first and second recess portions  14   h  and  11   m  may be omitted suitably. For example, the slide surface  14   g  and the guide surface  11   i  may be a flat surface free from recessed portions. Alternatively, only either one of the slide surface  14   g  and the guide surface  11   i  may have the first recess portion  14   h  or the second recess portion  11   m  as a recess portion. In addition, the slide surface  14   a  and the guide surface  11   i  need not necessarily be smooth surfaces, or they may be a smooth finished surface on which fine irregularities are formed. 
     Alternatively, the viscous damping material may be retained in a self contained packet that is disposed within one of the recesses. The material used in this application would be a gel like material or grease that is sealed within the packet and projects to provide contact with the guide member slide surface. 
       FIG. 6  shows details of a second preferred embodiment of the present invention. Like reference numbers have been used for the same structure as in the first preferred embodiment, and therefore the description thereof is omitted here. 
     In the second preferred embodiment, a second recess portion  11   n  functioning as a lubricant storage portion is formed on a guide surface  11   i . Like the second recess portion  11   m  in the first preferred embodiment, the second recess portion  11   n  is a recess portion with an opening into the guide surface  11   i,  and it can store, in its interior, lubricant such as grease. The shape of the  opening of the second recess portion  11   n  is a rectangle that is long in the insertion direction of a card  31 . Although the number of the second recess portions  11   n  shown in  FIG. 6  is two, it may also be one or three or more. Additionally, the position and layout of the second recess portion  11   n  can be determined suitably. 
     The guide surface  11   i  has a recess groove  11   p  functioning as a lubricant storage groove or moat, which is adjacent to a partition  11   k  and extends in the insertion direction of the card  31 . The recess groove  11   p  is a recess groove with an opening into the guide surface  11   i , and it can store, in its interior, lubricant such as grease. This enables a sufficient amount of grease to be held between the guide surface  11   i  and the slide surface  14   g . This also enables a large amount of excess grease to be stored in the recess groove  11   p . It is therefore able to reliably prevent the grease from flowing therearound from between the guide surface  11   i  and the slide surface  14   g  and onto bottom wall  11   a . The other construction and operation of the second preferred embodiment are identical to that described with respect to the first preferred embodiment, and therefore the description thereof is omitted here. 
     It is to be understood that the present invention should not be limited to the foregoing preferred embodiments and thus, various changes and modifications will occur to a person skilled in the art based on the gist of the invention, and they should not be excluded from the scope of the invention.