Patent Publication Number: US-2019179214-A1

Title: Waterproof lid opening-closing structure and electronic device including the same

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2017-235676 (filing date: Dec. 8, 2017), the entire contents of which are incorporated herein by reference. 
     TECHNICAL FIELD 
     The present invention relates to a waterproof lid opening-closing structure and an electronic device including the same. 
     RELATED ART 
     A waterproof opening-closing lid provided in a case of an electronic device is known and Japanese Patent Application Publication No. 2003-152351 describes a camera including the opening-closing lid. 
     The conventional opening-closing lid described in Japanese Patent Application Publication No. 2003-152351 is a lid configured to open and close a storage portion which is provided in a ridge portion between a side surface and a rear surface of the case and which houses a card and the like and can be locked in a closed state. 
     When opening the lid, a user slides a lid opening switch disposed on a bottom surface of the case to unlock the lid and then turns the lid. 
     SUMMARY 
     The conventional opening-closing lid has a problem that, when opening the lid, the user needs to perform two independent operations of the sliding operation of the lid opening switch and the turning operation of the lid, which take time and effort. 
     The conventional opening-closing lid also has a problem that, since the two independent operations are performed in different portions of the case, the opening operation of the lid and the method thereof are difficult for the user to intuitively understand. 
     Thus, the conventional waterproof opening-closing lid is desired to be improved in operability of opening it. 
     An object of the present invention is to provide a waterproof lid opening-closing structure and an electronic device with excellent operability of opening a lid. 
     A waterproof lid opening-closing structure according to an aspect of the present invention includes a packing member tightly fitted to the opening portion and configured to close an opening portion of a case, a holder connected to the case by a hinge portion and to which the packing member is attached, the holder configured to turn about an axis of the hinge portion between a closed position where the packing member closes the opening portion and an open position where the packing member opens the opening portion, a lid engaging with the holder in an engagement portion configured to allow the lid to slide by a predetermined stroke in a direction intersecting the axis, a slide biasing member biasing the lid in a direction away from the axis, a lock release knob attached to the lid and which is movable to a first position where the sliding of the lid relative to the holder is restricted and a second position where the sliding is allowed, and a lock biasing member biasing the lock release knob toward the first position. The engagement portion includes a first engagement portion formed in one of two portions of the lid which are divided in a direction of the axis and a second engagement portion formed in another one of the two portions. The slide biasing member includes a first slide biasing member disposed outside and adjacent to the first engagement portion and a second slide biasing member disposed outside and adjacent to the second engagement portion. 
     The waterproof lid opening-closing structure according to an aspect of the present invention provides a waterproof lid opening-closing structure and an electronic device with excellent operability of opening a lid. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a video camera  51  which is Example 1 of an electronic device according to an embodiment of the present invention. 
         FIG. 2  is a first view for explaining an operation of a lid opening-closing structure K provided in the video camera  51 . 
         FIG. 3  is a second view for explaining the operation of a lid opening-closing structure K. 
         FIG. 4  is an assembly view of a lid body  11  included in the lid opening-closing structure K. 
         FIG. 5  is a plan illustrating a lid  13  included in the lid body  11 . 
         FIG. 6  is a cross-sectional view at the position S 06 - 06  in  FIG. 5 . 
         FIG. 7A  is a cross-sectional view at the position S 07 -S 07  in  FIG. 1  and  FIG. 7B  is a plan of a lock release knob  12  included in the lid body  11 . 
         FIG. 8  is a plan illustrating a holder  15  included in the lid body  11 . 
         FIG. 9  is a cross-sectional view at the position S 09 -S 09  in  FIG. 8 . 
         FIG. 10  is a plan illustrating a cam groove  15   a  formed in the holder  15 . 
         FIG. 11  is a schematic view for explaining a structure of the lid opening-closing structure K. 
     
    
    
     DETAILED DESCRIPTION 
     In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the disclosed embodiments. It will be apparent, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are schematically shown in order to simplify the drawing. 
     Description will be hereinbelow provided for embodiments of the present invention by referring to the drawings. It should be noted that the same or similar parts and components throughout the drawings will be denoted by the same or similar reference signs, and that descriptions for such parts and components will be omitted or simplified. In addition, it should be noted that the drawings are schematic and therefore different from the actual ones. 
     A waterproof lid opening-closing structure according to an embodiment of the present invention and an electronic device including the same are described by using a lid opening-closing structure K of Example and a video camera  51  including the same. 
     Example 
       FIG. 1  is a perspective view of the lid opening-closing structure K and the video camera  51  including the same as viewed obliquely from the rear left side. Hereafter, the directions of front, rear, left, right, up, and down of the video camera  51  are defined as illustrated by the arrows in  FIG. 1  for the sake of explanation. The front side is a side where a subject to be imaged is present. 
     The video camera  51  includes a main body portion  1  which has a case  1   a , an image display portion  2  which can be opened and closed by being turned (arrow DRa) about an axis CL 1  extending in the up-down direction on a left surface of the main body portion  1 , and a grip belt  3  which is provided on a right surface of the main body portion  1  and which comes into contact with the back of the hand of a user gripping the main body portion  1 . A zoom button  1   b   1  is disposed on an upper surface  1   b  of the main body portion  1 . Moreover, a recording button  1   c   1  used to perform an operation of starting and stopping the recording is disposed in an upper right portion of a rear surface  1   c  and substantially the left half of the main body portion  1  is a storage portion S. 
     The video camera  51  includes an opening-closing lid body  11  (hereafter, also referred to simply as lid body  11 ) which closes an opening portion Sa of the storage portion S in a waterproof manner in a closed state and which opens an inside of the storage portion S in an open state. The lid body  11  includes a lock release knob  12  which can be operated by being pushed down by the finger. In this example, the lock release knob  12  is disposed substantially at the center of the lid body  11 . 
     The lid body  11  can be opened by performing the operation described below. In order to facilitate the understanding of the structure, the opening operation and modes of the structure are described prior to the detailed structure with reference to  FIGS. 2 to 4 .  FIGS. 2 and 3  are partial perspective views illustrating modes in the opening operation of the lid body  11 .  FIG. 4  is an assembly view of the lid body  11 . 
     When opening the closed lid body  11 , the user first pushes down (arrow DR 1 ) the lock release knob  12  in the state illustrated in  FIG. 1  with the finger. Since the lock release knob  12  is moderately biased upward by a compression resilient force of a knob coil spring  31  (see  FIG. 4 ) which is a biasing member, the user pushes down the lock release knob  12  against this compression resilient force. 
     Pushing down the lock release knob  12  cancels restriction of leftward movement of a lid  13  relative to a holder  15  (see  FIG. 4 ), the lid  13  and the holder  15  being an exterior member and an interior member of the lid body  11 , respectively. The lid  13  thereby slides leftward ( FIG. 2 : arrow DR 2 ) by a predetermined stroke by itself due to compression resilient forces of paired slide coil springs  32 ,  33  (see  FIG. 4 ) disposed inside the lid  13  as biasing members. 
     As illustrated in  FIG. 2 , a hinge portion  14  is exposed to the outside with the leftward sliding of the lid  13 , the hinge portion  14  supporting the lid body  11  such that it is turnable about an axis CL 11  extending in the up-down direction. The hinge portion  14  is a turning engagement portion between the holder  15  being the interior member and the case  1   a  of the main body portion  1 . Moreover, the leftward sliding of the lid  13  cancels engagement in an engagement portion Ka which restricts counterclockwise turning of the lid  13  as viewed from above (arrow DR 5 ) by means of interference between members (see  FIG. 1 ) and the lid  13  is set to a state where this turning is allowed. 
     The engagement portion Ka includes three portions of an upper engagement portion Ka 1 , a lower engagement portion Ka 2 , and a side engagement portion Ka 3  whose positions are roughly illustrated in  FIG. 1  by the reference numerals. Description is given with reference to  FIG. 3 . The upper engagement portion Ka 1  is configured to include an upper groove portion  1   a   1  which is formed near and outside an upper edge of the storage portion S in the case  1   a  to extend in the left-right direction and an upper rib  13   b   1  which protrudes downward in an inner surface upper portion of the lid  13  and which engages with the upper groove portion  1   a   1  by sliding to advance into the upper groove portion  1   a   1 . The lower engagement portion Ka 2  is configured to include a lower groove portion  1   a   2  which is formed near and outside a lower edge of the storage portion S in the case  1   a  to extend in the left-right direction and a lower rib  13   b   2  which extends upward in an inner surface lower portion of the lid  13  and which engages with the lower groove portion  1   a   2  by advancing into the lower groove portion  1   a   2  in the closed state. The side engagement portion Ka 3  is configured to include a pocket portion  1   a   3  which is provided near and outside a left edge of the storage portion S in the case  1   a  and which has a pocket-shaped space formed to spread in the left-right direction and the up-down direction and a side rib  13   b   3  which protrudes toward the hinge portion  14  in a side edge portion of the lid  13  away from the hinge portion  14  and which engages with the pocket portion  1   a   3  by sliding to advance into the pocket portion  1   a   3 . 
     The hinge portion  14  allows the lid body  11  to slightly move relative to the case  1   a  in the up-down direction and the radial direction to give priority to position restriction of the lid body  11  in the closed state and position restriction by tight fitting of a packing plate  16  to the storage portion S to be described later. In other words, so-called backlash is intentionally provided. 
     The hinge portion  14  includes a torsion coil spring  34  (see  FIG. 4 ) which biases the lid body  11  counterclockwise (in an opening direction) as viewed from above. Although the lid body  11  is biased counterclockwise about the axis CL 11  as viewed from above by the turning biasing force of the torsion coil spring  34 , the tight fitting of the packing plate  16  to the storage portion S keeps the lid body  11  in the state illustrated in  FIG. 2 . 
     In  FIG. 3 , substantially the entire packing plate  16  is covered with silicone rubber and at least an entire periphery of a peripheral edge portion  16   a  of the packing plate  16  has compressive elasticity in an extending direction. The packing plate  16  is tightly fitted to an inner surface  21   a  of an opening peripheral wall  21  in the storage portion S. Since the fitting friction force of this tight fitting is set to be greater than the turning force based on the torsion coil spring  34 , the lid body  11  is kept in the state illustrated in  FIG. 2 . 
     Meanwhile, as illustrated in  FIG. 2 , the leftward sliding of the lid  13  causes a left edge portion  13   a  of the lid  13  to partially protrude leftward from the case  1   a  and cancels the engagement between the lid  13  and the case  1   a  in the engagement portion Ka. Accordingly, when the user pushes ( FIG. 2 : arrow DR 4 ) the left edge portion  13   a  rearward with the finger with force greater than the fitting friction force between the packing plate  16  and the storage portion S, the packing plate  16  is released from the storage portion S. Then, the lid body  11  turns ( FIG. 3 : arrow DR 5 ) by itself about the axis CL 11  due to the turning biasing force of the torsion coil spring  34  to be set to the open state illustrated in  FIG. 3 , and the inside of the storage portion S is opened. 
     Multiple card slots  41 ,  42 , multiple connection terminals  43 ,  44  used to exchange data and signals with an external device, a microphone input terminal  45 , and the like are provided inside the storage portion S. Since the turning angle of the lid body  11  is set to 90° or more, it is possible to easily insert and remove cards into and from the card slots  41 ,  42  and insert and remove plugs into and from the connection terminals  43 ,  44  and the microphone input terminal  45 . 
     In order to close the open lid body  11 , the user closes the lid body  11  by first turning it with the finger in the direction opposite to the arrow DR 5  (clockwise as viewed from above) and sets the lid body  11  to the state illustrated in  FIG. 2 . In this case, since the last stage of the turning stroke is a stage in which the packing plate  16  is tightly fitted to the storage portion S, the resistance force increases. 
     The dimensions, the shapes, and the like of the lid body  11  are set such that the engagement between the grooves and the pocket portions in the engagement portion Ka will not progress, that is rightward sliding of the lid body  11  which is the next operation cannot be performed unless the angle of the lid body  11  relative to the case  1   a  reaches or falls below a predetermined angle in the turning of the lid body  11 . In other words, when the lid body  11  is closed, causing the packing plate  16  to reach a position where the packing plate  16  can sufficiently seal the storage portion S by being tightly fitted thereto enables the rightward sliding of the lid body  11  to be performed next. 
     When the rightward sliding of the lid body  11  is to be performed, a force against the biasing force of the knob coil spring biasing the lock release knob  12  is necessary in addition to a force against the compression resilient forces of the slide coil springs  32 ,  33 . As illustrated in  FIG. 7A  which is a cross-sectional view at the position S 07 -S 07  in  FIG. 1 , the lock release knob  12  includes paired bosses  12   a ,  12   b  which are sliders configured to slide in paired cam grooves  15   a ,  15   b  formed in the holder  15 . In detail, when the lid  13  is at the final position in the rightward sliding, the paired bosses  12   a ,  12   b  enter lock portions (passages CR 2  to be described later) extending in the up-down direction in the cam grooves  15   a ,  15   b  to lock the sliding of the lid  13 . The lock release knob  12  is made of a material with excellent sliding properties. An example of the material is a polyacetal resin. 
     The aforementioned opening-closing operation of the lid body  11  is achieved by the lid opening-closing structure K to be described next in detail. 
       FIG. 5  illustrates a front plan of the lid  13  in the closed state. The directions of up, down, left, and right in  FIG. 5  correspond to the directions in the closed state. The exterior shape of the lid  13  is a stadium elongating in the up-down direction and an example of the material of the lid  13  is a glass fiber reinforced polycarbonate (PC) resin. An opening portion  13   d  which elongates in the up-down direction is formed in a center portion of the lid  13 . A protruding operation portion  12   c  (see  FIGS. 4 and 7A ) of the lock release knob  12  is inserted into this opening portion  13   d  to engage therewith and be movable in the up-down direction. A peripheral wall portion  13   f  stands at a peripheral edge of an inner surface  13   e  of the lid  13  (see also  FIG. 3 ). The aforementioned upper rib  13   b   1  protrudes to extend leftward, rightward, and downward in an end portion of the peripheral wall portion  13   f  in an upper portion of the lid  13 . The aforementioned lower rib  13   b   2  protrudes to extend leftward, rightward, and upward in an end portion of the peripheral wall portion  13   f  in a lower portion of the lid  13 . 
     On the inner surface  13   e  of the lid  13 , there are provided engagement portions  13   e   1 ,  13   e   1  to which paired protrusions  17   a ,  17   a  of a hold-down plate  17  ( FIG. 4 ) are locked and a screw receiving boss  13   e   2  to which a screw N 1  ( FIG. 4 ) is screwed, the hold-down plate  17  ( FIG. 4 ) holding down the lock release knob  12  by holding the lock release knob  12  between itself and the lid  13 , the screw N 1  used to fix the hold-down plate  17  whose one end is locked. Moreover, a spring receiving rib  13   e   3  which receives a lower end of the knob coil spring  31  ( FIG. 4 ) is formed below the opening portion  13   d  on the inner surface  13   e  to protrude therefrom. Furthermore, paired holder engagement portions  13   g ,  13   h  extending in the left-right direction are provided on the inner surface  13   e  to be spaced away from each other in the up-down direction. Moreover, spring housing portions  13   j ,  13   k  are provided adjacent to the holder engagement portions  13   g ,  13   h  at positions near and outside the holder engagement portions  13   g ,  13   h , respectively. 
     The cross-sectional shape of the holder engagement portion  13   g  is illustrated in  FIG. 6  which is a cross-sectional view at the position S 06 -S 06  in  FIG. 5 . The cross-sectional shape of the holder engagement portion  13   h  is a shape horizontally symmetric to the cross-sectional shape of the holder engagement portion  13   g . As illustrated in  FIGS. 5 and 6 , the holder engagement portion  13   g  has an engagement wall portion  13   g   1  with a substantially L-shaped cross section. More specifically, the engagement wall portion  13   g   1  includes paired flange portions  13   g   2  protruding inward from distal end portion of the engagement wall portion  13   g   1  and spaced away from each other in the left-right direction. A portion between the paired flange portions  13   g   2  is a notch portion  13   g   3 . The holder engagement portion  13   h  also has a similar shape and an engagement wall portion  13   h   1  includes paired flange portions  13   h   2  protruding inward from distal end portion of the engagement wall portion  13   h   1  and spaced away from each other in the left-right direction. A portion between the flange portions  13   h   2  is a notch portion  13   h   3 . 
     The spring housing portions  13   j ,  13   k  house the slide coil springs  32 ,  33 , respectively, and include restriction walls  13   j   1 ,  13   k   1  standing to restrict the positions of left ends of the slide coil springs  32 ,  33 . 
     As illustrated in  FIG. 4 , the lock release knob  12  is supported by the hold-down plate  17  to be movable in the up-down direction by being held between the hold-down plate  17  and the inner surface  13   e  of the lid  13  with the operation portion  12   c  inserted to and engaging with the opening portion  13   d . The lock release knob  12  is biased upward by the compression resilient force of the knob coil spring  31  inserted between the lock release knob  12  and the spring receiving rib  13   e   3  to such a position that the operation portion  12   c  comes into contact with an upper end of the opening portion  13   d  in a natural state. 
     Next, the holder  15  is described with reference to  FIGS. 4, 8, and 9 .  FIG. 8  is a rear plan of only the holder  15  in the closed state of the lid body  11 .  FIG. 9  is a cross-sectional view at the position S 09 -S 09  in  FIG. 8 . 
     The holder  15  has a stadium shape which is slightly smaller than the lid  13  and which elongates in the up-down direction and an example of the material of the holder  15  is a glass fiber reinforced polycarbonate (PC) resin. A shaft  18  ( FIG. 4 ) is inserted in the up-down direction in a right edge portion of the holder  15  and a holder hinge portion  1514  configuring the hinge portion  14  turnable about the axis CL 11  relative to the case  1   a  is formed (the shape of the holder hinge portion  1514  is simplified in  FIG. 8 ). The torsion coil spring  34  is fitted onto the shaft  18  and, as described above, the holder  15  is biased counterclockwise (in the opening direction) relative to the case  1   a  as viewed from above by the torsion resilient force of the torsion coil spring  34 . 
     On a rear surface  15   s  facing the lid  13 , the holder  15  includes lid engagement portions  15   g ,  15   h  which are spaced away from each other in the up-down direction and which engage with the holder engagement portions  13   g ,  13   h  of the lid  13 . The lid engagement portions  15   g ,  15   h  include engagement wall portions  15   g   1 ,  15   h   1  and paired flange portions  15   g   2 ,  15   h   2  formed to be spaced way from each other in the left-right direction and to protrude outward from distal ends of the engagement wall portions  15   g   1 ,  15   h   1  to the upper side and the lower side, and are formed to have a substantially square U-shaped cross sections opening toward the outer side. Portions between the paired flange portions  15   g   2 ,  15   h   2  are formed to be notch portions  15   g   3 ,  15   h   3 . 
     The holder  15  includes spring housing portions  15   j ,  15   k  which correspond to the spring housing portions  13   j ,  13   k  of the lid  13  and house the slide coil springs  32 ,  33 , respectively. The spring housing portions  15   j ,  15   k  house the slide coil springs  32 ,  33  and include restriction walls  15   j   1 ,  15   k   1  which stand to restrict the positions of right ends of the slide coil springs  32 ,  33 , respectively. In the spring housing portions  15   j ,  15   k , portions opposite to the restriction walls  15   j   1 ,  15   k   1  are holding portions  15   j   2 ,  15   k   2  recessed in a U-shape and portions close to the restriction walls  15   j   1 ,  15   k   1  are opening portions  15   j   3 ,  15   k   3  which are holes penetrating the holder  15  in the front-rear direction. 
     The holder  15  includes paired screw receiving portions  15   m ,  15   m  protruding toward the viewer side of the sheet surface of  FIG. 8  and having lower holes  15   m   1  to which paired screws N 2  ( FIG. 4 ) are screwed from the opposite side to the viewer of the sheet surface. 
     The packing plate  16  is a plate-shaped member having a shape corresponding to the external shape and size of the holder  15 . The packing plate  16  is formed of a base plate member  16   b  which is slightly smaller than the external shape of the packing plate  16  and which is made of metal such as stainless steel and a cover portion  16   c  which covers substantially the entire surface of the base plate member  16   b  and which is made of silicone rubber or the like. Accordingly, the peripheral edge portion  16   a  of the packing plate  16  is formed only of silicone rubber and has at least compressive elasticity in the extending direction. The packing plate  16  includes through holes  16   d  at positions corresponding to the respective paired screw receiving portions  15   m  in the holder  15 . 
     The paired cam grooves  15   a ,  15   b  are formed on the rear surface  15   s  of the holder  15  as recess portions. 
     Since the cam grooves  15   a ,  15   b  have the same shape, the cam groove  15   a  is described next in detail as a representative. The description is given with reference to mainly  FIG. 10  and includes operations from assembly of the lid body  11  to the lid opening operation. 
     The difference between the groove width of the cam groove  15   a  and the outer diameter of the boss  12   a  of the lock release knob  12  which slides in the cam groove  15   a  is very small and slide feeling (cam slide feeling) without looseness can be provided to the user. 
     The cam groove  15   a  includes a passage CR in which multiple straight passages are connected in series. In the following description, positions C 1  to C 7  at the center of the groove width are substantially the same as a center position  12   a   1  of the sliding boss  12   a.    
     The passage CR includes a passage CR 1  between the positions C 1  and C 2 , a passage CR 2  between the positions C 2  and C 3 , a passage CR 3  between the positions C 3  and C 4 , a passage CR 4  between the positions C 4  and C 5 , a passage CR 5  between the positions C 5  and C 6 , and a passage CR 6  between the positions C 6  and C 7 . 
     The position C 1  is a position of the boss  12   a  in the case where the holder  15  is attached to the lid  13  to which the lock release knob  12  is attached. Specifically, the holder  15  is attached to the lid  13  to which the lock release knob  12  attached by aligning and engaging the flange portions  15   g   2 ,  15   h   2  of the holder  15  with the notch portions  13   g   3 ,  13   h   3  of the lid  13  in a state where the slide coil springs  32 ,  33  are not installed. The center position  12   a   1  of the boss  12   a  is at the position C 1  in this alignment. 
     Next, the slide coil springs  32 ,  33  are installed from the opening portions  15   j   3 ,  15   k   3  of the holder  15  into the spring housing portions  13   j ,  13   k  while being compressed. By this installing, the holder  15  is biased leftward by the compression resilient force of the slide coil springs  32 ,  33  and the boss  12   a  moves along the passage CR 1  such that the center position  12   a   1  thereof is located at the position C 2 . Then, the boss  12   a  comes into contact with a left wall C 2   a  and is restricted from moving leftward and alignment between the lid  13  and the holder  15  in the closed state is thereby achieved. Accordingly, even when someone tries to forcedly open the lid  13  leftward, the contact with the left wall C 2   a  surely prohibits leftward sliding. 
     When the closed lid body  11  is to be opened, the lock release knob  12  is pushed downward against the upward biasing force of the knob coil spring  31 . In this case, first, the center position  12   a   1  of the boss  12   a  moves, though slightly, directly downward along the passage CR 2  from the position C 2  to the position C 3 . In the passage CR 2 , since the boss  12   a  is in contact with the left wall C 2   a , the leftward sliding of the lid  13  is prohibited, although the leftward biasing force of the slide coil springs  32 ,  33  is applied to the lid  13 . 
     Since the passage CR 3  beyond the position C 3  is tilted toward the lower left side, the lid  13  moves leftward while the lock release knob  12  is pushed downward. Specifically, the passage CR 2  can provide a short time lag between the start of the push down operation of the lock release knob  12  by the user and the start of the leftward sliding and thereby provide a user with appropriate operation feeling which is not too sensitive. 
     When the center position  12   a   1  of the boss  12   a  reaches the position C 4  (when the lid  13  slides by an amount corresponding to a horizontal length of the passage CR 3 ), since the next passage CR 4  is horizontal, the lid  13  is made to slide leftward along the passage CR 4  at once by the leftward biasing force of the slide coil springs  32 ,  33 . 
     Since the next passage CR 5  is also a passage extending slightly upward, the lid  13  continuously and smoothly slides. In the passage CR 5 , the compression amount of the knob coil spring  31  is increased by the pushing down of the lock release knob  12  after the position C 2  and the lock release knob  12  receives stronger upward compression resilient force. Accordingly, in the tilted passage CR 5 , a component force of the compression resilient force in a direction along the passage acts on the lid  13 . Thus, the lid  13  is made to slide leftward by a resultant force of: component forces, in the direction along the passage CR 5 , of the horizontal compression resilient forces of the slide coil springs  32 ,  33 ; and the component force, in the direction along the passage CR 5 , of the compression resilient force of the knob coil spring  31 . Hence, the sliding of the lid  13  in the passage CR 5  is smoothly and quickly performed. 
     The center position  12   a   1  of the lock release knob  12  then reaches the position C 6 . The last passage CR 6  to the position C 7  beyond the position C 6  is a tilted passage more upright than the passage CR 5 . In this stage, the compression amounts of the slide coil springs  32 ,  33  are small and the elastic resilient force thereof are small while the compression amount of the knob coil spring  31  is still large. Moreover, since the passage CR 6  is an upward tilted passage extending further upward, the lid  13  receives a large component force, in a direction along the passage CR 6 , of the compression resilient force of the knob coil spring  31 . Accordingly, in the last stage of the sliding, the center position  12   a   1  reaches the position C 7  through passage CR 6  at high speed and the boss  12   a  violently comes into contact with an inner wall C 7   a  having an arc shape about the position C 7  in the cam groove  15   a . This contact generates a snapping sound being a collision sound. The user grasps the completion of the sliding from this collision sound and feels a sense of high-quality for the lid opening-closing structure K. 
     When the center position  12   a   1  of the boss  12   a  is at the position C 7 , the lid  13  is at an end position (leftmost position illustrated in  FIG. 2 ) in a stroke of the leftward-rightward sliding relative to the holder  15 . Moreover, when the center position  12   a   1  of the boss  12   a  is within a range close to the position C 7  in the passage CR 6  including the position C 7 , the engagement in the engagement portion Ka is canceled and the lid body  11  is openable. However, as described above, the packing plate  16  is tightly fitted to the inner surface  21   a  of the opening peripheral wall  21  in the storage portion S and fitting maintaining torque based on the fitting friction force between both members is set to be greater than the turning torque in the opening direction generated by the torsion coil spring  34  provided in the hinge portion  14 . Accordingly, the lid body  11  is maintained in the state illustrated in  FIG. 2  in which the lid  13  partially protrudes leftward from the case  1   a . Moreover, the lock release knob  12  is automatically lifted ( FIG. 2 : broken line arrow DR 3 ) in the movement of the boss  12   a  from the passage CR 4  to the passage CR 6 . 
     Accordingly, when the user pushes the protruding portion of the lid  13  rearward with the finger and releases the packing plate  16  from the inner surface  21   a  of the storage portion S, the lid body  11  is turned approximately 90° to the open position by the turning torque of the torsion coil spring  34 . 
     When the lid body  11  is to be closed from the open state, the lid body  11  is closed and the packing plate  16  is tightly fitted to the storage portion S. The inside of the storage portion is thereby waterproofed. Since the sliding and engagement of the lid  13  in the engagement portion Ka is possible at a sufficiently pressed-in turning position, the user sufficiently presses in the lid  13  and then pushes the lid  13  rightward. This causes the center position  12   a   1  of the boss  12   a  to first move through the passage CR 6  from the position C 7  to the position C 6  illustrated in  FIG. 10 . 
     The passage CR 6  is a passage extending downward with a tilt angle θ 6  thereof relative to the up-down direction being less than 45° (for example, 23°). The passage CR 5  subsequent to the passage CR 6  is a passage more horizontal than the passage CR 6  with a tilt angle θ 5  thereof being 45° or more (for example, 71°). Accordingly, the resistance force felt at the finger of the user during the rightward pushing of the lid  13  is large in an initial stage and then immediately decreases. The user feels this change in the resistance force as click feeling in an operation. The user thereby grasps the start of the sliding and feels the sense of high quality for the lid opening-closing structure K. 
     When the user further pushes and moves the lid body  11  rightward against the resultant force of the leftward biasing component forces based on the slide coil springs  32 ,  33  and the knob coil spring  31 , the boss  12   a  moves rightward in  FIG. 10  through the passage CR 5  and the center position  12   a   1  moves from the position C 5  through the passage CR 4  to reach the position C 4 . Since the tilt angle θ 3  of the passage CR 3  beyond the position C 4  relative to the up-down direction is less than 45° (for example,) 22°, the upward compression resilient force of the knob coil spring  31  greatly acts on the boss  12   a  and the boss  12   a  automatically moves through the passage CR 3  and the passage CR 2  and the center position  12   a   1  reaches the position C 2  which is a lock position and is maintained at the position C 2 . 
     Moreover, when the center position  12   a   1  reaches the position C 2 , the boss  12   a  violently comes into contact with an inner wall C 2   b  having an arc shape about the position C 2  in the cam groove  15   a . Thus, a snapping sound being a collision sound is generated. The user grasps the completion of the locking of the lid body  11  from this collision sound and feels a sense of high-quality for the lid opening-closing structure K. 
       FIG. 11  schematically illustrates an engagement relationship between the lid  13  and the holder  15 , a sliding relationship between the bosses  12   a ,  12   b  of the lock release knob  12  and the cam grooves  15   a ,  15   b , and a relationship between points where the compression resilient forces of the knob coil spring  31  and the slide coil springs  32 ,  33  are applied in the lid opening-closing structure K described above in detail. 
     As illustrated in  FIG. 11 , in the lid opening-closing structure K, the cam grooves  15   a ,  15   b  are disposed respectively at positions above and below a center horizontal line LNh located at the center of the lid opening-closing structure K in the up-down direction to be equidistant from the center horizontal line LNh. 
     The bosses  12   a ,  12   b  engaging with and sliding in the respective cam grooves  15   a ,  15   b  are located on the same line LN 12  extending in the up-down direction (see  FIG. 7B ), and the knob coil spring  31  biases the lock release knob  12 , that is the bosses  12   a ,  12   b  upward with a compression resilient force F 31  with the line LN 12  being the axis of the knob coil spring  31 . Specifically, the point where the compression resilient force F 31  is applied to the lock release knob  12  and the points where the bosses  12   a ,  12   b  of the lock release knob  12  act on the cam grooves  15   a ,  15   b  are substantially on the same line LN 12 . Accordingly, the compression resilient force F 31  of the knob coil spring  31  generates no rotation moment for the lid body  11 . Thus, the sliding of the lid body  11  in the opening-closing operation is smoothly performed without the lid body  11  tilting. 
     As illustrated in  FIG. 11 , in the lid opening-closing structure K, a first engagement portion (holder engagement portion  13   g  and lid engagement portion  15   g ) is provided in one (upper portion) of upper and lower portions of the lid body  11  which are divided in a direction of the axis CL 11  (up-down direction) and a second engagement portion (holder engagement portion  13   h  and lid engagement portion  15   h ) is provided in the other portion (lower portion). The border dividing the lid body  11  into the upper and lower portions is, for example, the center horizontal line LNh at the center in the up-down direction as described above. The engagement portions between the holder engagement portions  13   g ,  13   h  and the lid engagement portions  15   g ,  15   h  are disposed at positions in the upper and lower portions which are substantially symmetric with respect to the center horizontal line LNh. Specifically, the distance Hg from the center horizontal line LNh to an engagement line LNg 2  is equal to the distance Hh from the center horizontal line LNh to an engagement line LNh 2 . 
     Moreover, action lines LN 32  and LN 33  of the slide coil springs  32 ,  33  which bias the lid  13  and the holder  15  in the left-right direction are located outside and near the engagement lines LNg 2 , LNh 2 , respectively, and the distance Hg 2  between the action line LN 32  and the engagement line LNg 2  and the distance Hh 2  between the action line LN 33  and the engagement line LNh 2  are equal to each other and are set to be small by arranging the lines close to one another. The compression resilient forces F 32 , F 33  of the slide coil springs  32 ,  33  thereby generate almost no rotation moments for the lid  13  and the holder  15 . Even if the rotation moments are generated, the rotation moments cancel each other out due to opposite action directions and are suppressed to an almost ignorable level. Accordingly, the opening-closing operation of the lid body  11  can be smoothly performed irrespective of the size and shape of the lid body  11  without the lid body  11  tilting. 
     As described above, in the lid opening-closing structure K, the compression resilient force F 31  of the knob coil spring  31  and the compression resilient forces F 32 , F 33  of the slide coil springs  32 ,  33  which are involved in the sliding in the opening-closing operation of the lid body  11  act as forces assisting the sliding while applying substantially no rotation moment to the sliding of the lid  13  relative to the holder  15 , and also improve the user&#39;s feeling of the opening-closing operation. 
     Moreover, the lid opening-closing structure K includes the upper engagement portion Ka 1  and the lower engagement portion Kat in both end portions of the lid  13  in the longitudinal direction thereof and the side engagement portion Ka 3  in the side edge portion of the lid  13  as the engagement portion Ka which prohibits the open turning of the lid body  11  in the closed state thereof. Specifically, the engagement portion Ka restricts the open turning of the lid body  11  in the two end portions in the direction of the turning axis CL 11  of the lid body  11  and in the edge portion farthest from the axis CL 11 . The closed state in which the storage portion S is waterproofed can be thereby more surely maintained even when the lid body  11  is large or has a shape elongating in one direction. 
     The example described above in detail is not limited to the aforementioned configuration and may be modified as a modified example within a scope not departing from the spirit of the present invention. 
     The electronic device provided with the lid opening-closing structure K is not limited to the aforementioned video camera  51 . The lid opening-closing structure K can be applied to various devices including a radio device such as a handy transceiver, an information processing device such a mobile terminal, and the like. Moreover, the lid opening-closing structure K may be applied to an electronic device to provide a dust-proof function. The aforementioned directions of up, down, left, right, front, and rear are set for the sake of explaining the case where the electronic device is the video camera  51 , and do not limit the attitude and the usage mode of the lid opening-closing structure K. Accordingly, the turning direction of the lid body  11  is not limited to the horizontal direction and may be any direction. 
     The knob coil spring  31  which biases the lock release knob  12  and the slide coil springs  32 ,  33  which bias the lid  13  in the sliding direction are not limited compression coil springs and may be replaced by biasing members of other modes. For example, the springs  31 ,  32 ,  33  may be tension coil springs or leaf springs. The cams on which the bosses  12   a ,  12   b  slide is not limited to the aforementioned cam grooves  15   a ,  15   b  which are grooves. For example, the cams may be steps or rib-shaped cams. The direction in which the lid  13  slides relative to the holder  15  does not have to be the direction orthogonal to the axis CL 11  of the hinge portion  14 , and may be a direction intersecting the axis CL 11 .