Patent Publication Number: US-6700565-B2

Title: Slide switch

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to slide switches. More particularly, the invention relates to a slide switch having a case member, a slide member movable within a planar range of movement defined in the case member, a conducting device formed between the case member and the slide member, and an elastic member for holding the slide member in a neutral position in which the conducting device becomes non-conducting. 
     2. Description of the Related Art 
     One example of slide switches as noted above is disclosed in Japanese laying-open patent publication H10-302576. This slide switch has a slide member movable within a planar range of movement defined in a case member, a conducting device formed between the case member and the slide member, and an elastic member for holding the slide member in a neutral position in which the conducting device becomes non-conducting. The conducting device comprises four elongate armatures formed by a conductive plate to act also as an elastic member. These four elongate armatures are mounted in a rectangular hollow space formed between the case member and the slide member. A conductive plate is disposed in the bottom of the rectangular hollow space for allowing the four elongate armatures to be used commonly. Specifically, each elongate armature is supported at one end thereof by a coiner of the case member, while the armature in a position adjacent the other end acting as a movable contact is pressed against a part of the slide member. As the slide member is moved in the range of movement by a manual operating force, a movable contact touches a fixed contact formed on an inner wall of the case member. 
     However, the above prior art construction has a large number of parts since the elastic member for maintaining the slide member in the neutral position consists of four elongate members. Further, a process of assembling the switch must include a complex step of pushing the four small elastic elongate members, against the elasticity of the elongate members, and in a way to maintain their correct posture, into the narrow rectangular hollow space between the case member and the slide member. This poses a problem of hampering improved manufacturing efficiency. 
     Another example of slide switches as noted above is disclosed in Japanese laying-open patent publication H7-235240. This switch has a case member, a slide member movable within a planar range of movement defined in the case member, a conducting device formed between the case member and the slide member, and an elastic member for holding the slide member in a neutral position. In this construction, a hollow, conductive, elastic ring mounted on a boss formed under the slide member acts as both the conducting device and the elastic member. A plurality of insulating projections erected on the bottom of the case member contact the outer surface of the elastic ring to hold the elastic ring in the neutral position. As the slide member is moved in the range of movement by a manual operating force, a peripheral part of the elastic ring is pushed out radially from between the insulating projections, to touch a fixed contact erected on the bottom of the case member. 
     This construction has a relatively small number of parts, and its assembling operation is considered relatively easy. However, it is technically difficult and involves increased cost to realize an elastic ring having sufficient conductivity, appropriate elasticity and physical durability, and the hollow structure as well. 
     An object of this invention is to provide a slide switch having a small number of parts, easy to assemble, and relatively inexpensive. Another object of this invention is to realize a slide switch, with a minimum number of parts, for constantly maintaining a slide member in an angular posture about an axis perpendicular to a plane of a range of movement. 
     A further object of this invention is to realize a slide switch, with a minimum number of parts, capable of detecting a manual operation applied to a slide member along Z-axis perpendicular to a plane of a range of movement in addition to a manual operation applied parallel to the plane of the range of movement. 
     SUMMARY OF THE INVENTION 
     The above objects are fulfilled, according to this invention defined in claim  1 , by a slide switch comprising a case member, a slide member movable in a planar range of movement defined in the case member, a conducting device formed between the case member and the slide member, and an elastic member for holding the slide member in a neutral position where the conducting device is non-conductive, the elastic member being an integral unit having a holding portion engaged with the slide member, and projecting portions extending from the holding portion along the planar range of movement toward inner walls of the case member, wherein the conducting device includes contacts arranged on the inner walls of the case member, and conductors arranged on the holding portion of the elastic member, and the conductors of the elastic member are movable into contact with the contacts of the case member by an external force for moving the slide member away from the neutral position against a biasing force of the elastic member, and separable from the contacts by the biasing force of the elastic member when the external force is removed. 
     With the above characteristic construction, the slide switch according to this invention defined in claim  1  has the elastic member formed as an integral unit, and therefore the number of parts is reduced correspondingly. For the same reason, the elastic member may be assembled into the case member with ease. Further, the conducting device is realized by arranging the conductors on the holding portion of the elastic member. This allows the elastic member itself to be formed of an ordinary, inexpensive non-conductive elastomer, hence an advantage of a relatively low manufacturing cost. 
     The inner walls of the case member and outer surfaces of the slide member may have a common polygonal shape, each of the outer surfaces of the slide member being maintained parallel to an opposed one of the inner walls of the case member, absent the external force, by the biasing force of the elastic member. 
     With this construction, where, for example, the slide member is made movable from a neutral position in four directions, right and left and up and down, along the planar range of movement to realize four types of switching operation corresponding to the four directions, the slide member is positioned to have the conductors contact the predetermined contacts by virtue of contact between a side wall of the case member and a side wall of the slide member. This is achieved not only when the slide member is operated in the four directions, right and left and up and down, but also when the slide member is operated in a direction between two adjacent directions of the four directions. This assures a reliable switching operation and an agreeable operational feeling. 
     The inner walls of the case member and the holding portion of the elastic member may form squares as seen in a direction perpendicular to the planar range of movement, the projecting portions of the elastic member extending from respective corners of the square of the holding portion toward respective corners defined by the inner walls of the case member, the contacts may be formed on the four inner walls of the case member, respectively, and the conductors may be formed on the four sides of the holding portion of the elastic member, respectively. 
     This construction enables a light and swift switching operation since the conductors formed on the holding portion of the elastic member can contact the contacts formed on the inner walls of the case member substantially only by means of deformation of the projecting portions having a small sectional area. Further, the elastic member is prevented from inadvertently rotating inside the case member by engagement between extreme ends of the projecting portions and respective corners defined by the inner walls of the case member. This effectively avoids erroneous switching operations. 
     The case member may include support portions formed in the respective corners thereof for supporting the projecting portions of the elastic member to maintain the holding portion in a state spaced from a bottom surface of the case member. 
     This construction provides little chance of friction between the holding portion occupying a central region of the elastic member and the bottom surface of the case member, thereby enabling a light and swift switching operation. At the same time, this construction assures a smooth return to the neutral position of the slide member. 
     The elastic member includes bend points elastically yieldable even to a slight external force. 
     This construction furthers the light and swift switching operation. 
     Each of the projecting portions of the elastic member may have a pair of plate-like members separated by a slit extending radially outwardly from the holding portion, and joined together at extreme ends thereof. 
     With this construction, a movement of the slide member necessary to execute a single switching operation involves a deformation of only one side of certain projecting portion separated by the slit. Consequently, an external force required to move the slide member is halved, to realize a still lighter switching operation. Further, with this construction, the slide member is movable toward the corners in the case member while forcing its way into the slits. This feature enables two types of switching corresponding to two adjacent directions among the four, right and left and up and down directions. 
     In the construction noted above, each of the projecting portions may have, formed at an extreme end thereof, a bend point elastically yieldable even to a slight external force. 
     With this construction, a single switching operation and a simultaneous operation of two types of switching may be carried out with a lighter touch. 
     In another aspect of the invention, a slide switch, as set forth in claim  8 , comprises a case member, a slide member movable in a planar range of movement defined in the case member, a conducting device formed between the case member and the slide member, an elastic member for holding the slide member in a neutral position where the conducting device is non-conductive, the elastic member having a holding portion engaged with the slide member, and projecting portions extending from the holding portion along the planar range of movement toward inner walls of the case member, and a guide mechanism for maintaining the slide member in a fixed angular posture about an axis perpendicular to the planar range of movement regardless of movement of the slide member caused by the external force, wherein the conducting device includes contacts arranged on the inner walls of the case member, and conductors arranged on the holding portion of the elastic member, and the conductors of the elastic member are movable into contact with the contacts of the case member by an external force for moving the slide member away from the neutral position against a biasing force of the elastic member, and separable from the contacts by the biasing force of the elastic member when the external force is removed. 
     With the above construction, the slide switch according to this invention defined in claim  8 , the conducting device is realized by arranging the conductors on the holding portion of the elastic member. This allows the elastic member itself to be formed of an ordinary, inexpensive non-conductive elastomer, hence an advantage of a relatively low manufacturing cost. Further, the guide mechanism acts to maintain the slide member constantly in a fixed angular posture about the axis perpendicular to the planar range of movement. Thus, the elastic member is prevented from inadvertently rotating. Where a control member is disposed outside the case member for receiving a manual operating force directly, and transmitting this force to the slide member, the control member may have indications marked thereon to signify switching directions. Such a switch will perform excellent functions in a satisfactory manner. 
     In a further aspect of the invention, a slide switch, as set forth in claim  11 , comprises a case member, a slide member movable in a planar range of movement defined in the case member, a conducting device formed between the case member and the slide member, an elastic member for holding the slide member in a neutral position where the conducting device is non-conductive, the elastic member having a holding portion engaged with the slide member, and projecting portions extending from the holding portion along the planar range of movement toward inner walls of the case member, and an auxiliary conducting device electrically switchable on and off by an external force applied to the slide member and acting along a Z-axis perpendicular to the planar range of movement, wherein the conducting device includes contacts arranged on the inner walls of the case member, and conductors arranged on the holding portion of the elastic member, and the conductors of the elastic member are movable into contact with the contacts of the case member by the external force for moving the slide member away from the neutral position against a biasing force of the elastic member, and separable from the contacts by the biasing force of the elastic member when the external force is removed. 
     With the above construction, the slide switch according to this invention defined in claim  11  is capable of detecting a manual operation applied to the slide member along Z-axis perpendicular to the planar range of movement as well as a manual operation applied parallel to the planar range of movement. This slide switch is realized while maintaining a minimum number of parts. 
     To realize the above construction, the slide switch may, specifically, further comprise an auxiliary elastic member elastically deformable by the external force acting along the Z-axis, wherein the auxiliary conducting device includes a fixed contact formed on a bottom surface of the case member, and a movable contact formed on the auxiliary elastic member for contacting the fixed contact in response to the external force along the Z-axis, and separable from the fixed contact upon removal of the external force acting along the Z-axis. 
     This construction detects a switching operation only when an operating force is applied to the slide member along Z-axis to elastically deform the auxiliary elastic member. While such an operating force is removed, the contact and movable contact remain separated by the action of the auxiliary elastic member. 
     The auxiliary elastic member may comprise a dome-shaped member having a concave side opposed to the surface of the case member, and a convex side opposed to the slide member, at least the concave side being formed of a conductive material acting as the movable contact. 
     With this construction, since the movable contact is formed on the convex side of the dome-shaped member opposed to the slide member, even where the slide member is slidable in contact with the convex side of the dome-shaped member, for example, resistance to the slide member within the planar range of movement may be equalized regardless of the direction of movement. 
     Further, even when a manual operating force is applied along Z-axis to a position slightly displaced from the center of the dome-shaped member, the central position of the dome-shaped member is elastically deformed to produce a conducting state. As a result, a simultaneous detection may be made of a switch-on state based an operation of the slide member in the planar range of movement, and a switch-on state based an operation of the slide member along Z-axis. 
     The slide switch may further comprise a control member supported outside the case member for receiving a manual operating force, the control member and the slide member being connected to each other whereby the manual operating force received by the control member is transmitted to the slide member. 
     With this construction in which the control member connected to the slide member as noted above, when the control member is operated in a sliding direction, the elastic member is deformed to enable an electrical detection of this operation. When the control member operated in the direction of depression, the auxiliary elastic member is deformed to enable an electrical detection of the operation along Z-axis. As a result, while allowing a smooth operation of the control member disposed outside the case member, a direction of operation may be electrically detected reliably. 
     The slide switch may further comprise a guide mechanism for maintaining the slide member in a fixed angular posture about an axis perpendicular to the planar range of movement regardless of movement of the slide member caused by the external force, wherein the guide mechanism includes an intermediate slide member disposed between the slide member and a lid covering an upper surface of the case member; and a guide member disposed between the slide member and the auxiliary elastic member; a first guide being formed between the slide member and the intermediate slide member for guiding the intermediate slide member to move along an X-axis relative to the lid, and a second guide being formed between the lid and the intermediate slide member for guiding the slide member to move along an a Y-axis intersecting the X-axis relative to the intermediate slide member; the guide member supporting the slide member movable within the planar range of movement, and deformable along a Z-axis perpendicular to the planar range of movement. 
     With this construction, when the slide member is operated, the guide mechanism causes the slide member to make a parallel movement. This eliminates the inconvenience of the slide member inadvertently rotating within the planar range of movement. Moreover, the slide member is guided by the guide member to move smoothly within the planar range of movement. Even where a depressing force acts to displace the slide member along Z-axis, the guide member is deformed to allow movement of the slide member. As a result, where the slide member has a control member in the form of a keytop, for example, and the control member has indications marked thereon showing switching directions, there is no possibility of errors occurring with the directions indicated. A depressing operation may be carried out smoothly despite the provision of the guide mechanism. 
     Alternatively, the slide switch may further comprise a guide mechanism for maintaining the slide member in a fixed angular posture about an axis perpendicular to the planar range of movement regardless of movement of the slide member caused by the external force; wherein the guide mechanism includes an intermediate slide member disposed between the slide member and the auxiliary elastic member; and a guide member disposed between the intermediate slide member and the auxiliary elastic member; a first guide being formed between the guide member and the intermediate slide member for guiding the intermediate slide member to move along an X-axis relative to the case member, and a second guide being formed between the slide member and the intermediate slide member for guiding the slide member to move along an a Y-axis intersecting the X-axis relative to the intermediate slide member; the guide member supporting the slide member movable within the planar range of movement, and deformable along a Z-axis perpendicular to the planar range of movement. 
     With this construction, when the slide member is operated, the guide mechanism causes the slide member to make a parallel movement. This eliminates the inconvenience of the slide member inadvertently rotating within the planar range of movement. Moreover, the slide member is guided by the guide member to move smoothly within the planar range of movement. Even where a depressing force acts to displace the slide member along Z-axis, the guide member is deformed to allow movement of the slide member. As a result, where the slide member has a control member in the form of a keytop, for example, and the control member has indications marked thereon showing switching directions, there is no possibility of errors occurring with the directions indicated. A depressing operation may be carried out smoothly despite the provision of the guide mechanism. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a slide switch in a first embodiment of the invention: 
     FIG. 2 is an exploded perspective view of the slide switch shown in FIG. 1; 
     FIG. 3 is a side view in vertical section of the slide switch of FIG. 1; 
     FIG. 4 is a cross-sectional plan view of the slide switch shown in FIG. 1; 
     FIG. 5 is a cross-sectional plan view of the slide switch with an operating force applied to a slide member; 
     FIG. 6 is a cross-sectional plan view of the slide switch with a different operating force applied to the slide member; 
     FIG. 7 is a cross-sectional plan view showing the bottom of a main case body of the slide switch shown in FIG. 1; 
     FIG. 8 is a perspective view illustrating a mode of manufacturing an elastic member; 
     FIG. 9 is a sectional view of the elastic member; 
     FIG. 10 is a sectional view of a modified elastic member; 
     FIG. 11 is a perspective view illustrating a different mode of manufacturing an elastic member; 
     FIG. 12 is a sectional view of a modified elastic member; 
     FIG. 13 is an exploded perspective view of a slide switch in a second embodiment; 
     FIG. 14 is a side view in vertical section of the slide switch shown in FIG. 13; 
     FIG. 15 is a plan view of a main case body of the slide switch shown in FIG. 13; 
     FIG. 16 is a perspective view of a slide switch in a third embodiment; 
     FIG. 17 is an exploded perspective view of the slide switch shown in FIG. 16; 
     FIG. 18 is a side view in vertical section of the slide switch shown in FIG. 16; 
     FIG. 19 is a cross-sectional plan view of the slide switch shown in FIG. 16; 
     FIG. 20 is a cross-sectional plan view of the slide switch with an operating force applied to a slide member; 
     FIG. 21 is a cross-sectional plan view of the slide switch with a different operating force applied to the slide member; 
     FIG. 22 is a perspective view of a slide switch in a fourth embodiment; 
     FIG. 23 is an exploded perspective view of the slide switch shown in FIG. 22; 
     FIG. 24 is a side view in vertical section of the slide switch shown in FIG. 22; 
     FIG. 25 is a cross-sectional plan view of the slide switch shown in FIG. 22; 
     FIG. 26 is a cross-sectional plan view of the slide switch with an operating force applied to a slide member; 
     FIG. 27 is a cross-sectional plan view of the slide switch with a different operating force applied to the slide member; and 
     FIG. 28 is a side view in vertical section of a slide switch in a fifth embodiment. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Embodiments of this invention will be described hereinafter with reference to the drawings. 
     First Embodiment 
     A slide switch  100  shown in FIG. 1 has a keytop  1  (one example of control member) acting as a manually operable member. The keytop  1 , when not operated, is maintained in a neutral position N (non-operated position). The keytop  1  is operable, from the neutral position N, in X-direction, in Y-direction perpendicular to X-direction, in varied directions combining X- and Y-directions, and in Z-direction (direction of depression) perpendicular to these directions. Such operations of the keytop  1  are electrically detected. This slide switch  100  may be used with a remote controller of a household electric appliance, a mobile phone, a controller of a game machine, a dashboard of a car, and so on. 
     The slide switch  100  has the keytop  1  and a case member C. A panel of a household electric appliance or the like may be disposed between the keytop  1  and case member C. 
     As shown in FIGS. 1 through 4 and FIG. 7, the case member C includes a main case body  2  disposed in a lower position in FIGS. 1 through 3, and a lid  3  for covering an upper opening of main case body  2  in FIGS. 1 through 3. The main case body  2  contains an elastic member  4 , a slide member  5 , a guide plate  15  (one example of guide member) and an auxiliary elastic member  16 . A sheet  6  is disposed to cover an area over these components. The keytop  1  is disposed above the lid  3 . 
     The slide member  5  is slidable in a planar range of movement corresponding to the plane of FIG.  4 . The main case body  2  is formed of a resin material such as ABS resin or PPS resin to define four side walls  2 A,  2 B,  2 C and  2 D and a bottom wall  2 E. The main case body  2  forms a square as seen in a direction perpendicular to the plane of the range of movement, and opens upward. The bottom wall  2 E of main case body  2  includes, adjacent the four corners defined with the side walls  2 A,  2 B,  2 C and  2 D, supports  2 F elevated from the level of a central region thereof. Each of the four side walls  2 A,  2 B,  2 C and  2 D forming a square has a pair of contacts  7  (one example of conducting device) formed of a good conductor such as a copper alloy. Conducting terminals  8  formed integral with these contacts  7  project from outer surfaces of the main case body  2 . 
     The bottom wall  2 E defines a circular recess  2 H centrally thereof. A first fixed contact  17  is disposed in an inner central position of the recess  2 H. The recess  2 H further includes a ring-like second fixed contact  18  formed around the first fixed contact  17 . The first fixed contact  17  and second fixed contact  18  are formed of a good conductor such as a copper alloy. A second terminal  19  connected to the second fixed contact  18 , and a first terminal  20  connected to the first fixed contact  17 , project from the outer surfaces of main case body  2 . In addition, the auxiliary elastic member  16  having a dome shape made by processing a metal disc of a good conductor such as a copper alloy is fitted in the recess  2 H, with a bulging face directed toward the opening of main case body  2  (upward in the drawings). The auxiliary elastic member  16  has an outer periphery thereof maintained in contact with the second fixed contact  18 , while the central portion of the auxiliary elastic member  16  is maintained out of contact with the first fixed contact  17 . The auxiliary elastic member  16  has a movable contact  16   a  formed on a lower surface thereof, which, in combination with the first fixed contact  17  and the second fixed contact  18 , constitute a contact unit P. 
     When the keytop  1  is depressed toward the bottom wall  2 E (in Z-direction) by a manual operating force, the auxiliary elastic member  16  is elastically deformed to allow the central position thereof to move into contact with the first fixed contact  17 . This contact connects the first terminal  20  and second terminal  19 , whereby the operation for depressing the keytop  1  is electrically detected. In order that the user may feel a click when the auxiliary elastic member  16  is depressed, the auxiliary elastic member  16  is formed of a material that has a biasing force for restoration lowering to a great extent when its central portion under pressure deforms beyond a predetermined amount in the depressing direction. 
     The main case body  2  has a plurality of engaging projections  2 G formed on outer surfaces of the side walls  2 A,  2 B,  2 C and  2 D. On the other hand, the lid  3  is formed of metal such as aluminum or steel or plastic such as PET, to have a generally square configuration in the form of a thin plate having a size to cover the opening of the main case body  2 . The lid  3  has an opening  3 A formed centrally thereof, and lugs formed adjacent the corners and defining engaging openings  3 B for receiving the engaging projections  2 G of the main case body  2 . 
     The elastic member  4  is formed of an elastomeric material elastically deformable and electrically nonconductive, such as silicon rubber, ethylene propylene rubber (EPDM) and nitrile rubber (NBR). This elastic member  4  is formed to have an integral construction including a holding portion  4 A in the form of a hollow square frame smaller than the main case body  2 , and four projecting portions  4 B extending outwardly from the corners of the holding portion  4 A toward the inner wall of the main case body  2 . Each projecting portion  4 B is formed of a pair of plate-like members separated by a slit S extending radially outwardly from the holding portion  4 A, and joined at extreme ends thereof. The slit S is continuous with the opening  4 C of the holding portion  4 A. The holding portion  4 A has, formed integral with the four side surfaces thereof opposed to the side walls  2 A,  2 B,  2 C and  2 D of the main case body  2 , conductors  9  (one example of the other conducting device) formed of a resin base containing a carbon material, for example. 
     In other words, the elastic member  4  includes a four-sided holding portion  4 A extending circumferentially of the rectangular slide member  5 , and pairs of projecting portions  4   b  extending from opposite ends of the holding portion  4 A toward the four corners of the inner walls of main case body  2 . A slit S is extends between each pair of projecting portions  4   b . Each pair of projecting portions  4   b  have extreme ends thereof connected together. Each pair of projecting portions  4   b  includes, adjacent the extreme ends thereof, a pair of bend points  4   e  having a smaller sectional area than the other parts and elastically yieldable even to a slight external force. The elastic member  4  is placed above the guide plate  15 , with extreme end regions of the projecting portions  4 B placed on the four supports  2 F. A greater part of the elastic member  4 , particularly the entire holding portion  4 A is freely movable within the planar range of movement formed in the main case body  2 , without contacting the bottom wall  2 E of the main case body  2  and the guide plate  15 . 
     The elastic member  4  used with the slide switch  100 , in particular, is manufactured by extruding molding, as shown in FIGS. 8 and 9, to form the holding portion  4 A and projecting portions  4 B together as a tubular unit. The strap-like conductors  9  may be fixedly bonded to the outer surfaces of the holding portion  4 A of this molded product. The strap-like conductors  9  may be inserted when extruding the holding portion  4 A and projecting portions  4 B as an integral formation. Alternatively, as shown in FIGS. 11 and 12, when extruding the holding portion  4 A and projecting portions  4 B, protrusions  4 D may be formed on the four sides of the holding portion  4 A to be opposed to the side walls  2 A,  2 B,  2 C and  2 D of main case body  2 , and layers of the conductors  9  may be formed by padding technique to apply a conductive ink and conductive paint to outer surfaces of these protrusions  4 D, thereby forming a tubular product with strap-like conductors  9  formed integrally therewith. The tubular product is cut to a thickness for accommodation in the main case body  2 . 
     It is also possible to manufacture the elastic member  4  one by one by using a metal die. In this case, as shown in FIG. 10, the conductors  9  formed of a good conductor such as a copper alloy may be inserted and integrated. 
     The guide plate  15  is placed in tight contact with the bottom wall  2 E of the main case body  2 . The guide plate  15  defines a guide bore  15 A extending in X-direction and movably supporting an intermediate slide member  10 . The slide member  5  is supported by the intermediate slide member  10  to be movable in the direction (Y-direction) perpendicular to the direction of movement of the intermediate slide member  10 . The guide plate  15  defining the guide bore  15 A, the intermediate slide member  10 , and a system for sidably supporting the slide member  5  on the intermediate slide member  10 , constitute a guide mechanism T 1 . The slide member  5  is formed of a resin material to have a shape fitting tight in the opening  4 C of the holding portion  4 A of the elastic member  4 . The slide member  5  has an engaging recess  5 A formed centrally of an upper surface thereof for receiving and connecting a shank  1 A of the keytop  1 . 
     The guide mechanism T 1  will now be described in detail. The guide plate  15  has a size for fitting in the main case body  2  in tight contact with the bottom wall  2 E, and is supported in the main case body  2  not to be rotatable relative thereto. The guide plate  15  is formed, for example, of an insulating plastic material elastically deformable in the direction of thickness. The intermediate slide member  10  has a lower surface thereof acting as a sliding contact surface  15 B for sidable contact with the upper surface of the guide plate  15 . A projection  10 A (one example of the other first guide) is formed on the sliding contact surface  15 B for engaging the guide bore  15 A (one example of the one first guide). The slide member  5  has a guide groove  5 T (one example of the other second guide) formed in a lower surface thereof for receiving the intermediate slide member  10  (one example of the one second guide). Thus, the intermediate slide member  10  is sidable longitudinally of the guide bore  15 A (in X-direction) of the guide plate  15 . The slide member  5  is sidable relative to the intermediate slide member  10 , in the direction (Y-direction) perpendicular to the sliding direction of the intermediate slide member  10 . Consequently, the slide member  5  is sidable in X-direction, Y-direction, and composite directions combining X- and Y-directions, within the “planar range of movement” defined in the main case body  2 , without changing its posture (i.e. without rotating) relative to the main case body  2 . 
     The slide member  5 , having a construction simply fitted in the holding portion  4 A of the elastic member  4 , is movable in the direction (Z-direction) perpendicular to the sliding directions (X-Y directions) within the “planar range of movement”. The guide plate  15  and auxiliary elastic member  16  are arranged in the stated order from the slide member  5  toward the bottom wall  2 E of the main case body  2 . Thus, when the keytop  1  is depressed toward the main case body  2 , the auxiliary elastic member  16  is elastically deformed, while elastic deforming the guide plate  15 , whereby the movable contact  16   a  at the center of the auxiliary elastic member  16  is placed in contact with the first fixed contact  17 . The projection  10 A extends from the lower surface of intermediate slide member  10  to a large extent below the guide plate  15 , so that auxiliary elastic member  16  in particular may elastically deform well when a depressing force is applied to the keytop  1  in neutral position in X-Y directions. 
     As shown in FIGS. 2 and 3, the sheet  6  has a small friction factor and excellent sliding characteristic, and has a size for fitting in the main case body  2 . The sheet  6  defines a square through hole  6 A smaller than the slide member  5  as seen in the direction perpendicular to the sliding directions of the slide member  5 . 
     With each component constructed as described above, when assembling this slide switch  100 , the auxiliary elastic member  16  is set in the main case body  2  already having the contacts  7  and the first and second contacts  17  and  18 , and then the guide plate  15  is set in place. The intermediate slide member  10  is set to have the projection  10 A extend through the guide bore  15 A of the guide plate  15 . The slide member  5  is set in place, with the intermediate slide member  10  fitted in the guide groove  5 T formed in the lower surface. The elastic member  4  is set in position to receive the slide member  5  in the holding portion  4 C, and the sheet  6  is placed over the upper surface. Finally, the lid  3  is pressed toward the main case body  2 . This pressing operation causes the engaging opening  3 B to engage the plurality of engaging projections  2 G of the main case body  2 . As a result, the lid  3  is secured to the main case body  2 . Thereafter the shank  1 A of the keytop  1  is inserted from above through the opening  3 A of lid  3  and the opening  6 A of sheet  6  to fit into the engaging bore  5 A of slide member  5 , to complete the slide switch  100 . 
     With the slide switch  100  assembled as described above, the keytop  1 , when not operated, lies in neutral position N in X-Y directions, and the contact unit P remains non-conductive. In the interior, as shown in FIG. 4, the slide member  5  is maintained at the center of the main case body  2  by the biasing force of the elastic member  4 . The contacts  7  of the main case body  2  are separated from the conductors  9  of the elastic member  4 . Thus, every contact  7  remains isolated from the corresponding conductor  9 . 
     Next, when an external force is applied to the keytop  1  in a direction perpendicular to the side wall  2 A,  2 B,  2 C or  2 D (i.e. in a direction along either X-direction or Y-direction), e.g. toward the left side wall  2 D in FIG. 5, the slide member  5  and intermediate slide member  10  move along the guide bore  15 A The side of the holding portion  4 A of elastic member  4  downstream in the direction of operation is displaced toward the side wall  2 D (since the projection portions  4   b  on the left side of the elastic member  4  undergo an elastic deformation, particularly at the bend points  4   e ). The conductor  9  of the elastic member  4  thereby contacts the pair of contacts  7  on this side wall  2 D to render the pair of contacts  7  conductive. The above displacement of the elastic member  4  expands the slits S of the two projecting portions  4 B at opposite ends of that side of the holding portion  4 . Thus, the projecting portions  4 B allow the displacement while exerting an elastic biasing force on the slide member  5  in a restoring direction. 
     When an external force is applied to the keytop  1  in an oblique direction toward a comer of the main case body  2 , e.g. in a direction between the upper side wall  2 A and left side wall  2 D in FIG. 6, the intermediate slide member  10  moves along the guide bore  15 A, and at the same time the slide member  5  moves by means of the guide groove  5 T along the intermediate slide member  10 . The slide member  5  then forces into the upper left slit S. The two sides of the holding portion  4 A of elastic member  4  downstream in the direction of operation are simultaneously displaced toward the corresponding side walls  2 A and  2 D. The two conductors  9  of the elastic member  4  thereby simultaneously contact the pairs of contacts  7  on the side walls  2 A and  2 D to render the pair of contacts  7  conductive. The above displacement of the elastic member  4  expands the slit S of the projecting portion  4 B downstream in the direction of operation, to allow the forced entry of the slide member  5 . The slits S of the two projecting portions  4 B at opposite sides of the expanding slit S also expand. Thus, the projecting portions  4 B allow the displacement while exerting an elastic biasing force on the slide member  5  in a restoring direction. 
     Further, when the keytop  1  is not depressed in Z-direction, as shown in FIG. 3, the movable contact  16   a  of the auxiliary elastic member  16  which is par of the contact unit P remains separated from the first fixed contact  17 . When the keytop  1  lying in neutral position N in X-Y directions is depressed in Z-direction toward the main case body  2 , the guide plate  15  is elastically deformed to apply a pressing force to the auxiliary elastic member  16  from the projection  10 A on the lower surface of the intermediate slide member  10 . The movable contact  16   a  of the auxiliary elastic member  16  is elastically displaced into contact with the first fixed contact  17 . As a result, this operation is electrically detected. When this depressing force is removed, the contact between the auxiliary elastic member  16  and the first fixed contact  17  is canceled by the restoring force of the auxiliary elastic member  16 , and the keytop  1  is restored in the original position. 
     As described above, when the keytop  1  is operated in one of X-Y directions, the slide member  5  supporting the keytop  1  make a parallel movement under the action of the guide mechanism T 1 , without changing an angular posture relative to the main case body  2 . Consequently, as shown in FIG. 1, the keytop  1  may have such characters as “UP”, “DW”, “R” and “L” correctly indicating the directions of operation without deviation. 
     In this embodiment, the contact unit P is constructed for detecting an operation particularly when the keytop  1  is depressed from the neutral position N. The contact unit P of this invention may be adapted to detect also an operation to depress the keytop  1  from any position, other than the neutral position N, in X-Y directions. 
     This invention may be implemented not only in the foregoing embodiment but in the following embodiments also. (In the following embodiments, like reference numerals or signs will be used to identify like parts with respect to the first embodiment.) 
     Second Embodiment 
     A slide switch  200  shown in FIGS. 13,  14  and  15  has a main case body  22 , a lid  23  defining a guide bore  23 A, and an intermediate slide member  30  disposed under the lid  3 . The intermediate slide member  30  defines an opening  30 C. The opening  30 C has a projecting edge (one example of the one second guide) to be guided in Y-direction by the guide bore  23 A of the lid  23  (one example of the other second guide). The intermediate slide member  30  has a pair of guides  30 T (one example of the one first guide) projecting from the lower surface thereof. A slide member  25  disposed under the intermediate slide member  30  has a guide groove  25 T (one example of the other first guide) for receiving the pair of guides  30 T, so that the slide member  25  is guided in X-direction perpendicular to X-direction relative to the intermediate slide member  30 . The slide member  25  has an opening  25 A for receiving a shank  21 A of a keytop  21 . An insulating plastic sheet  31  is fixedly applied to the bottom wall  22 E. The plastic sheet  31  supports the slide member  25  in sliding contact, so that the slide member  25  is freely movable within the “planar range of movement” in the main case body  22 . The guide bore  23 A of the lid  23 , the opening edge of the intermediate slide member  30 , the guides  30 T of the intermediate slide member  30 , the guide groove  25 T of the slide member  25 , and the plastic sheet  31 , constitute a guide mechanism T 2  for guiding the slide member  25  of the slide switch  200 , without rotating about an axis perpendicular to the “planar range of movement”. 
     The opening  25 A of the slide member  25  is shaped square not to be rotatable relative to the shank  21 A of the keytop  21  fitted therein. This opening  25 A is a bottomed hole, and the bottom surface includes a projection slightly projecting downward as seen in FIG.  14 . When the keytop  21  is depressed (in Z-direction), the projection applies a pressing force through the plastic sheet  31  to the contact unit P. 
     The second embodiment is different from the first embodiment only in the construction of guide mechanism T 2 , and the plastic sheet  31  placed over the contact unit P, the other aspects being the same as in the first embodiment. 
     That is, the main case body  22  has side walls  22 A,  22 B,  22 C and  22 D and a bottom wall  22 E, and includes, adjacent the four corners, supports  22 F elevated from the level of a central region thereof. Each of the side walls  22 A,  22 B,  22 C and  22 D has a pair of contacts  27  formed on an inner surface thereof, and conducting terminals  28  formed integral with these contacts  27  and projecting from outer surfaces of the main case body  22 . 
     The bottom wall  22 E defines a circular recess  22 H centrally thereof. A first fixed contact  37  is disposed in an inner central position of the recess  22 H. The recess  22 H further includes a ring-like second fixed contact  38  formed around the first fixed contact  37 . The first fixed contact  37  and second fixed contact  38  are formed of a good conductor such as a copper alloy. A second terminal  39  connected to the second fixed contact  38 , and a first terminal  40  connected to the first fixed contact  37 , project from the outer surfaces of main case body  22 . In addition, an auxiliary elastic member  36  having a dome shape made by processing a metal disc of a good conductor such as a copper alloy is fitted in the recess  22 H, with a bulging face directed toward the opening of main case body  22  (upward in FIG.  14 ). The auxiliary elastic member  36  has an outer periphery thereof maintained in contact with the second fixed contact  38 , while the central portion thereof is maintained out of contact with the first fixed contact  37 . The auxiliary elastic member  36 , the first fixed contact  37  and the second fixed contact  38 , constitute the contact unit P. 
     The main case body  22  has a plurality of engaging projections  22 G formed on outer surfaces of the four side walls  22 A,  22 B,  22 C and  22 D. The lid  23  is formed of metal such as aluminum or steel or plastic such as PET, to have a generally square configuration in the form of a thin plate having a size to cover the opening of the main case body  22 . The lid  23  has lugs formed adjacent the corners and defining engaging openings  23 B for receiving the engaging projections  22 G of the main case body  22 . 
     A biasing member  24  includes a holding portion  24 A in the form of a hollow square frame, and four projecting portions  24 B extending outwardly from the corners of the holding portion  24 A. Each projecting portion  4 B defines a slit S continuous with the opening  24 C of the holding portion  24 A. The holding portion  24 A has, formed integral with the four side surfaces thereof opposed to the side walls  22 A,  22 B,  22 C and  22 D of the main case body  22 , conductors  29  formed of a resin base containing a carbon material. 
     With the above construction, when the keytop  21  lying in neutral position N is depressed in Z-direction, the slide member  25  moves downward with the keytop  21 . The projection formed on the lower surface of the slide member  25  applied a pressure to deform the plastic sheet  31  and elastically deform the central position of auxiliary elastic member  36  downward. The first fixed contact  37  and second fixed contact  38  are thereby made conductive, thereby allowing this operation to be electrically detected. 
     As a modification of this embodiment, the auxiliary elastic member  36  may be made rectangular or linear instead of circular. This construction will allow a simplification of the contact unit P. 
     As another modification of this embodiment, the contact unit P may include a contact switchable from conductive state to non-conductive state when the keytop  21  is depressed. This construction may allow an inverter to be dispensed with where the slide switch is used with a logic circuit. 
     Third Embodiment 
     The slide switch  300  shown in FIG. 16 as a third embodiment does not include the mechanism, as described in the first and second embodiments, for detecting an operation to depress the keytop  1  in Z-direction. 
     This slide switch  300  may also be used with a remote controller of a household electric appliance, a mobile phone, a controller of a game machine, a dashboard of a car, and so on. The slide switch  300  includes a keytop  41  and a case member  40 C as main components thereof. A panel of a household electric appliance, for example, is to be disposed between the keytop  41  and case member  40 C. 
     As shown from FIGS. 16 through 19, the case member  40 C includes a main case body  42 , and a lid  43  for covering an opening of the main case body  42 . The main case body  42  contains an elastic member  44  and a slide member  45 . A sheet  46  is placed over the elastic member  44  and slide member  45 . The keytop  41  is placed over the lid  43 . 
     The third embodiment differs from the first and second embodiments in the construction of a guide mechanism T 3 , with only the contact unit P omitted. The third embodiment is the same as the fist and second embodiments in other aspects. 
     As shown in FIG. 17, the guide mechanism T 3  includes a guide bore  42 T (one example of the one first guide) formed in the bottom wall  42 E of the main case body  42  to extend along X-direction, an intermediate slide member  51  formed of plastic and having a portion  51 T (one example of the other first guide) formed on a lower surface thereof for engaging the guide bore  42 T, and a slide member  45  having a guide groove  45 T formed in a lower surface thereof. The intermediate slide member  51  as a whole extends in Y-direction perpendicular to X-direction, i.e. has its longitudinal direction perpendicular to the guide bore  42 T. The guide groove  45 T (one example of the one second guide) formed in the lower surface of slide member  45  receives the intermediate slide member  51  (one example of the other second guide), and restricts the movement relative to the slide member  45  of the intermediate slide member  51  to Y-direction. As a result, the slide member  45  is sidable in X-direction, Y-direction, and composite directions combining X- and Y-directions without changing its angular posture (i.e. without rotating) relative to the main case body  42 . 
     As shown in FIGS. 17 and 18, a closure member  53  is provided to cover a lower surface (outer surface) of the bottom wall  42 E of the main case body  42  to prevent entry of foreign matters to the main case body  42  through the guide bore  2 T. The closure member  53  is formed of plastic film. The sheet  46  has a small friction factor and excellent sliding characteristic, and has a size for fitting in the main case body  42 . The sheet  46  defines a square through hole  46 A smaller than the slide member  45 . Further, the keytop  41  has a shank  41 A formed on a lower surface thereof for fitting in an engaging bore  45 A of the slide member  45 . 
     With each component constructed as described above, when assembling this slide switch  300 , the intermediate slide member  51  is set in the main case body  42  with the lower projection  51 T fitted in the guide bore  42 T. The slide member  45  is set in place so that the intermediate slide member  51  fits in the guide groove  45 T. The elastic member  44  is set to have the slide member  45  fitted in the opening  44 C, and then the sheet  46  placed over the upper surface. Finally, the lid  43  is pressed toward the main case body  42 . This pressing operation causes engaging opening  43 B to engage a plurality of engaging projections  42 G of the main case body  42 . As a result, the lid  43  is secured to the main case body  42 . Thereafter the shank  41 A of the keytop  41  is inserted from above through the opening  43 A of lid  43  and the opening  46 A of sheet  46  to fit into the engaging bore  45 A of slide member  45 , to complete the slide switch  300 . When mounting this slide switch  300  on a substrate (not shown), the slide switch is placed in position with the closure member  53  present between the bottoms of the slide switch and upper surfaces of patterns formed on the substrate, and conducting terminals  48  of the switch are fixedly soldered to the patterns, or otherwise connected to terminals on the substrate. 
     With the slide switch  300  assembled as described above, when the keytop  41  is in neutral position N, as shown in FIG. 19, the slide member  45  is maintained at the center of the main case body  42  by the biasing force of the elastic member  44 . The contacts  47  of the main case body  42  are separated from the conductors  49  of the elastic member  44 . Thus, every contact  47  remains isolated from the corresponding conductor  49 . 
     Next, when the keytop  41  is operated in a direction perpendicular to the side wall  42 A,  42 B,  42 C or  42 D (i.e. in a direction along either X-direction or Y-direction), e.g. toward the left side wall  42 D in FIG. 20, the slide member  45  and intermediate slide member  51  move along the guide bore  42 T. As a result, the side of the holding portion  44 A of elastic member  44  downstream in the direction of operation is displaced toward the side wall  42 D. The conductor  49  of the elastic member  44  thereby contacts the pair of contacts  47  on this side wall  42 D to render the pair of contacts  47  conductive. The above displacement of the elastic member  44  expands the slits S of the two projecting portions  44 B at opposite ends of that side of the holding portion  44 . Thus, the projecting portions  44 B allow the displacement while exerting an elastic biasing force on the slide member  45  in a restoring direction. 
     When the keytop  41  is operated in a direction toward a comer of the main case body  42 , e.g. in a direction between the upper side wall  42 A and left side wall  42 D in FIG. 21, the intermediate slide member  51  moves along the guide bore  42 T, and at the same time the slide member  45  moves along the intermediate slide member  51 . Thus, as shown in FIG. 21, the two sides of the holding portion  44 A of elastic member  44  downstream in the direction of operation are simultaneously displaced toward the corresponding side walls  42 A and  42 D. As a result, the two conductors  49  of the elastic member  44  simultaneously contact the pairs of contacts  47  on the side walls  42 A and  42 D to render the pair of contacts  47  conductive. The above displacement of the elastic member  44  expands the slit S of the projecting portion  44 B downstream in the direction of operation, to allow the movement of the slide member  45 . The slits S of the two projecting portions  44 B at opposite sides of the expanding slit S also expand. Thus, the projecting portions  44 B allow the displacement while exerting an elastic biasing force on the slide member  45  in a restoring direction. 
     As a modification of the third embodiment, for example, the bottom wall  42 E of the main case body  42  may have a guide groove instead of the guide bore  42 T, or may have a guide rail protruding from the bottom wall  42 E. 
     Fourth Embodiment 
     The slide switch  400  shown in FIG. 22 as a fourth embodiment does not include the contact unit P, as described in the first and second embodiments, for detecting an operation to depress the keytop  1  in Z-direction, or the guide mechanism described in the third embodiment for preventing the slide member from rotating about an axis extending through the planar range of movement inside the main case body. 
     This slide switch  400  may also be used with a remote controller of a household electric appliance, a mobile phone, a controller of a game machine, a dashboard of a car, and so on. 
     The slide switch  400  includes a keytop  61  and a case member C as main components thereof. A panel of a household electric appliance, for example, is to be disposed between the keytop  61  and case member C. 
     As shown from FIGS. 22 through 25, the case member C includes a main case body  62 , and a lid  63  for covering an opening of the main case body  62 . The main case body  62  contains an elastic member  64  and a slide member  65 . A sheet  66  is placed over the elastic member  64  and slide member  65 . The keytop  61  is placed over the lid  63 . 
     The slide member  65  is slidable in a planar range of movement corresponding to the plane of FIG.  25 . The main case body  62  includes four side walls  62 A,  62 B,  62 C and  62 D and a bottom wall  62 E. The main case body  62  forms a square as seen in a direction perpendicular to the plane of the range of movement, and opens upward. The bottom wall  62 E of main case body  62  includes, adjacent the four corners defined with the side walls  62 A,  62 B,  62 C and  62 D, supports  62 F elevated from the level of a central region thereof. Each of the four side walls  62 A,  62 B,  62 C and  62 D forming a square has a pair of contacts  67 . Conducting terminals  68  formed integral with these contacts  7  project from outer surfaces of the main case body  62 . Further, the main case body  62  has a plurality of engaging projections  62 G formed on outer surfaces of the four side walls  62 A,  62 B,  62 C and  62 D. On the other hand, the lid  63  has a square configuration and a size to cover the opening of the main case body  62 . The lid  63  has an opening  63 A formed centrally thereof, and lugs formed adjacent the corners and defining engaging openings  63 B for receiving the engaging projections  62 G of the main case body  62 . 
     The elastic member  64  is formed of an elastomeric material elastically deformable and electrically nonconductive, such as silicon rubber, ethylene propylene rubber (EPDM) and nitrile rubber (NBR). The elastic member  64  is formed to have an integral construction including a holding portion  64 A in the form of a hollow square frame smaller than the main case body  62 , and four projecting portions  64 B extending from the corners of the holding portion  64 A toward the inner wall of the main case body  62 . Each projecting portion  64 B is formed of a pair of plate-like members separated by a slit S extending radially outwardly from the holding portion  64 A, and joined at extreme ends thereof. The slit S is continuous with the opening  64 C of the holding portion  64 A. The holding portion  64 A has, formed integral with the four side surfaces thereof opposed to the side walls  62 A,  62 B,  62 C and  62 D of the main case body  62 , conductors  69  formed of a resin base containing a carbon material, for example. 
     In other words, the elastic member  64  includes a four-sided holding portion  64 A extending circumferentially of the rectangular slide member  65 , and pairs of projecting portions  64   b  extending from opposite ends of the holding portion  64 A toward the four corners of the inner walls of main case body  62 . A slit S is extends between each pair of projecting portions  64   b . Each pair of projecting portions  64   b  have extreme ends thereof connected together. Each pair of projecting portions  64   b  includes, adjacent the extreme ends thereof, a pair of bend points  64   e  having a smaller sectional area than the other parts and elastically yieldable even to a slight external force. The elastic member  64  is placed above the bottom wall  62 E, with extreme end regions of the projecting portions  64 B placed on the four supports  62 F. A greater part of the elastic member  64 , particularly the entire holding portion  64 A is freely movable within the planar range of movement formed in the main case body  62 , without contacting the bottom wall  62 E of the main case body  62 . 
     The slide member  65  is formed of plastic to have a shape fitting tight in the opening  64 C of the holding portion  64 A of the elastic member  64 . The slide member  65  has an engaging recess  65 A formed centrally of an upper surface thereof. The sheet  66  is formed of plastic to have a small friction factor, and has outside dimensions for fitting in the main case body  62 . The sheet  66  defines a square through hole  66 A smaller than the slide member  65  as seen in the direction perpendicular to the planar range of movement of the slide member  65 . A shank  61 A formed on the lower surface of the keytop  61  extends through the through hole  66 A to fit into the engaging bore  65 A of the slide member  65 . 
     When assembling this slide switch  400 , the slide member  65  is set inside the main case body  62 , with the extreme ends of projecting portions  64 B placed on the supports  62 F, the slide member  65  is fitted in the opening  64 C of the elastic member  64 , and the sheet  66  is placed over the upper surface. Finally, the lid  63  is pressed toward the main case body  62 . This pressing operation causes the engaging openings  63 B of the lid  63  to engage the plurality of engaging projections  62 G of the main case body  62 . As a result, the lid  63  is secured to the main case body  62 . Thereafter the shank  61 A of the keytop  61  is inserted from above through the opening  63 A of lid  63  and the opening  66 A of sheet  66  to fit into the engaging bore  65 A of slide member  65 , to complete the slide switch  400 . When mounting this slide switch  400  on a substrate (not shown), the conducting terminals  68  are placed in position on patterns formed on the substrate and fixed by soldering, or the conducting terminals  68  of the switch may be connected to terminals on the substrate. 
     With the slide switch  400  assembled as described above, when the keytop  61  is in neutral position N, as shown in FIG. 25, the slide member  65  is maintained at the center of the main case body  62  by the biasing force of the elastic member  64 . The contacts  67  of the main case body  62  are separated from the conductors  69  of the elastic member  64 . Thus, every contact  67  remains isolated from the corresponding conductor  69 . 
     Next, when the keytop  61  is operated in a direction perpendicular to the side wall  62 A,  62 B,  62 C or  62 D (i.e. in a direction along either X-direction or Y-direction), e.g. toward the left side wall  62 D in FIG. 26, the side of the holding portion  64 A of elastic member  64  downstream in the direction of operation is displaced toward the side wall  62 D since the projection portions  64   b  on the left side of the elastic member  64  undergo an elastic deformation at the bend points  64   e . The conductor  69  of the elastic member  64  thereby contacts the pair of contacts  67  on this side wall  62 D to render the pair of contacts  67  conductive. The above displacement of the elastic member  64  expands the slits S of the two projecting portions  64 B at opposite ends of that side of the holding portion  64 . Thus, the projecting portions  64 B allow the displacement while exerting an elastic biasing force on the slide member  65  in a restoring direction. 
     When the keytop  61  is operated in a direction toward a comer of the main case body  62 , e.g. in a direction between the upper side wall  62 A and left side wall  62 D in FIG. 27, one comer of the slide member  5  forces into the slit S of one of the projecting portions  64 B. The two sides of the holding portion  64 A of elastic member  64  downstream in the direction of operation are simultaneously displaced toward the corresponding side walls  62 A and  62 D since the projection portions  64   b  of the elastic member  64  undergo an elastic deformation at the three bend points  64   e . As a result, the two conductors  69  of the elastic member  64  simultaneously contact the pairs of contacts  67  on the side walls  62 A and  62 D to render the pair of contacts  67  conductive. The above displacement of the elastic member  64  expands the slit S of the projecting portion  64 B downstream in the direction of operation, to allow the movement of the slide member  65 . The slits S of the two projecting portions  64 B at opposite sides of the expanding slit S also expand. Thus, the projecting portions  64 B allow the displacement while exerting an elastic biasing force on the slide member  65  in a restoring direction. 
     The inner walls of the main case body  62 , i.e. the interior surface of the side walls  62 A,  62 B,  62 C and  62 D, and outer surfaces of the slide member  65 , are all square (one example of common polygons). When the keytop  61  is free from an external force, these square side surfaces are maintained parallel to each other by the action of the elastic member  64  to maintain the position and angular posture of the slide member  65  relative to the main case body  62  in neutral state as shown in FIG.  25 . Thus, the slide member  65 , not only when operated to slide in the four, up and down and right and left directions, but also when operated in a composite direction between two adjacent directions, is maintained in a position to realize a desired switching by contact between each inner side wall of the main case body  62  and opposed side of the slide member  65 . In other words, even when certain rotatory force about Z-axis is applied to the keytop  61 , the above construction effectively avoids a situation where a non-corresponding pair of contact  67  and conductor  69  contact each other. This assures a reliable switching operation and an agreeable operational feeling. 
     Fifth Embodiment 
     The fifth embodiment, as a modification of the fourth embodiment, includes a construction for operating a keytop  71  in X- and Y-directions, and besides for depressing the keytop  71  in Z-direction perpendicular to X- and Y-directions, and a mechanism for electrically detecting this operation. This detecting mechanism is different from the mechanism in the first and second embodiments. 
     The slide switch  500  shown in FIG. 28 as the fifth embodiment includes an intermediate lift member  85  disposed below a slide member  75  to be vertically displaceable relative to a main case body  72 , and an auxiliary elastic member  86  for contacting the lower surface of intermediate lift member  85 . The main case body  72  includes, arranged on a bottom surface thereof, an annular, first fixed contact  87  (one example of auxiliary conducting device), and a second fixed contact  88  (one example of auxiliary conducting device) disposed adjacent the center of the first fixed contact  87 . The auxiliary elastic member  86  has an outer periphery constantly in contact with the first fixed contact  87 . 
     When a manual operating force is applied to depress the keytop  71  along Z-axis perpendicular to a planar range of movement (a plane including X- and Y-directions), this operating force downwardly displaces the intermediate lift member  85  while elastically deforming the auxiliary elastic member  86 . As a result, a movable contact  86   a  (one example of auxiliary conducting device) formed on the back side of a domed central portion of the auxiliary elastic member  86  moves into contact with the second fixed contact  88 . Upon removable of the operating force applied to the keytop  71 , the elastic restoring force of the auxiliary elastic member  86  separates the movable contact  86   a  on the auxiliary elastic member  86  from the second fixed contact  88  to eliminate the conductive state.