JP2011248437A - Protection cover for portable display terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cover to protect a portable display terminal having a flat and approximately rectangular shape from impact of falling.SOLUTION: The protection cover 1 is made of an elastic material and integrally molded into an approximately rectangular shape to cover the outer edge part of a flat and approximately rectangular-shaped portable display terminal such as an electronic book terminal and has a plurality of projecting ribs formed integrally by the elastic material and separate from each other on four corners 6, 7, 8, 9 of the protection cover along the arc-shaped corner of the enclosure so as to relieve the impact of falling. The plurality of projecting ribs include side-projecting ribs 10, 11, 12, 13 projected in parallel to the face of the approximately rectangular shape into the exterior, and upper projecting ribs 14, 15, 16, 17 and lower projecting ribs 18, 19, 20, 21 that are projected into upward/downward vertical direction with their external side located outside the side of the enclosure corner. The back side of the protection cover for portable display terminal is provided with a plurality of protrusions 22 and linear ribs 23 formed on it along its external edges in a closed, continuous, approximately rectangular shape, and the protrusions 22 have a projection amount that puts them in contact with the same plane the lower projecting ribs are in contact with.

Description

  The present invention relates to a cover for protecting a flat portable display terminal from an impact such as dropping.

  In order to protect the corners of the personal computer from damage due to the impact of dropping, in Patent Document 1, a continuous elastic body having an H-shaped cross-sectional structure is fitted on the entire side wall of the personal computer, and when dropped, it protrudes outward in parallel from the side wall. Two elastically deforming parts are put on the ground first and the impact is absorbed by preventing the PC side wall from directly hitting. If the PC falls on the ground with a large inclination from the direction in which the side wall of the personal computer hits (in a posture that is almost parallel to the front or back surface of the personal computer), the elastic body does not absorb the impact sufficiently and may be destroyed.

  In order to absorb the impact at the time of dropping and protect the electronic device from damage, Patent Document 2 shows an elastic protective cover. The protective cover is provided with a semicircular brim that covers all sides of an electronic device such as a remote control and protrudes outward from the side. In addition, many cylindrical protrusions are provided on the bottom surface of the protective cover, which absorbs impact and increases friction, which serves as protection and resistance to sliding. In the case of dropping at a posture with a large angle from the direction in which the side surface hits, it is not sufficient to protect an electronic device having a thin and large area and a fragile display surface like an electronic book.

  Patent Document 3 discloses a configuration of a buffer member for protecting a portable electronic device from an impact caused by dropping and improving operability of holding. Thick convex portions are arranged at the corner portions of the side surface of the substantially rectangular housing, and the upper and lower side surfaces are covered with a buffer member in which a portion gripped by the hand is thinned. Even in this configuration, the impact is not sufficiently absorbed when falling in a posture with a large angle from the direction in which the side faces hit. In addition, it does not have a positive structure for protecting vulnerable display surfaces.

  Patent Document 4 discloses a structure in which a package is protected with a packaging container such as cardboard and a cushioning material. Cushioning corner pads that are easily compressed and deformed are arranged at the eight corners of the substantially cubic package. The corner pad for buffering is provided with convex ribs on the three orthogonal surfaces centered at the apex, and absorbs the impact force applied from the packaging container by spring deformation of the convex ribs. It is not intended to be used without a packaging container, and cannot be applied to a thin package.

  Another method for disposing a shock absorber between portable electronic devices wrapped in an outer case is disclosed in Patent Document 5. A high-hardness shock absorbing material that is continuous on the upper and lower surfaces and side surfaces of the peripheral edge of the portable electronic device is arranged on the outside, and an independent low-hardness shock absorbing material is arranged on the outer side to absorb the shock applied from the outer case. The shock absorber is not a single material and cannot be used alone without an outer case.

  Patent Document 6 discloses a method for protecting a portable electronic device from an impact at the time of dropping with a protector in which a shock absorbing rib is formed inside. The protector covers the upper and lower side surfaces of the casing of the portable electronic device in close contact with each other. In the configuration in which the ribs are formed on the inner side, it is difficult to effectively arrange the corners having a thin casing and a large curvature, and the outer shape and the weight are likely to increase.

US Pat. No. 5,392,920

US Pat. No. 5,360,108

JP2000-236169A

JP 2002-53178 A

JP 2006-153108 A

JP-A-3-159299

  The protective cover of the portable display terminal of the present invention is applied to a flat and substantially rectangular portable display terminal such as an electronic book terminal having a fragile display surface, and is durable against a drop impact in any direction. Hold the display surface when not in use.

  In claim 1, the protective cover of the portable display terminal of the present invention is integrally formed with an elastic material in a shape covering the outer edge of the casing of the flat and substantially rectangular portable display terminal. Side convex ribs projecting in a direction parallel to a substantially rectangular surface from four corners of the protective cover, and upper and lower convex ribs projecting in the vertical direction perpendicular to each other are arcuate housing angles. It is formed independently in the shape along the part.

  Whatever posture the portable display terminal falls in, any one of the convex ribs is allowed to collide with the ground first, and the impact is mitigated by largely deforming the convex rib. In particular, a fragile display surface is less likely to collide directly. Most of the elastic material that covers the casing other than the corners of the protective cover is formed relatively thin, and the addition of the outer shape and weight is reduced, so that it corresponds to an electronic book terminal that requires lightness and thinness.

  According to a second aspect of the present invention, the thickness of the side convex rib protruding from the protective cover corner is made equal to or less than the thickness of the casing corner of the portable display terminal to be covered. In addition, the outer surfaces of the upper and lower convex ribs are formed at positions outside the upper and lower ends of the case corner in a direction parallel to the substantially rectangular surface. Even if any of the convex ribs collides due to falling, most of the impact force is distributed and applied to the side of the corner of the casing of the portable display terminal.

  According to a third aspect of the present invention, the side convex rib has an outer shape having a larger curvature than that of the arcuate casing corner of the portable display terminal on a surface parallel to the substantially rectangular surface of the protective cover. The overall outer dimension of the protective cover is not increased, the amount of protrusion of the side convex ribs is increased, and the impact is further reduced.

  5. The protruding portion according to claim 4, wherein the plurality of protruding portions are provided at positions along the outer edge portion of the casing of the portable display terminal and are in contact with the lower convex rib formed of the same elastic material. . A stable posture is secured and the back surface of the portable display terminal is protected from impact.

  6. The substantially rectangular shape according to claim 5, wherein the plurality of linear ribs are arranged at positions along the outer edge portion of the casing of the portable display terminal so as to be connected between adjacent protruding portions and closed together with the protruding portions. It is formed of the same elastic material.

  In Claim 6, the substantially rectangular-shaped lid | cover in which the several hole part which can be fitted to four upper convex ribs was formed is arrange | positioned at the front side of a portable display terminal so that attachment or detachment is possible. Prevents the object from hitting the fragile display surface when not in use and reduces the impact of collision.

  8. The lid of the portable display terminal according to claim 7, wherein the hole of the lid can be fitted into the lower convex rib, and the lid having a shape that does not cover the protrusion formed along the outer edge of the back surface of the protective cover is held on the back side of the portable display terminal. Is done. The lid can be stored easily.

  In Claim 8, the lid is formed of an elastic material. The impact is absorbed by the elasticity of the lid, and it is easy to fit and hold onto the upper convex rib or the lower convex rib.

  The protective cover of the portable display terminal of the present invention is applied to a flat and substantially rectangular portable display terminal such as an electronic book terminal, and can have durability against a drop impact in any direction. .

  By attaching a protective cover, the addition of weight and outer shape is small and easy to handle.

  The fragile display surface is configured so that it is difficult for objects to hit directly.

  It is difficult to slip on the hand, knee, or desk, and the portable display terminal can be prevented from falling and the posture can be stabilized.

  Moreover, the lid that prevents the object from directly hitting the display surface can be easily attached and detached.

Example 1 of the protective cover of the portable display terminal of the present invention is shown in a perspective view. The perspective view which mounted | wore the portable display terminal with the protective cover of Example 1 is shown. Example 1 with which the portable display terminal was mounted | worn is shown with a front view. The expanded sectional view of the corner | angular part of Example 1 with which the portable display terminal was mounted | worn is shown. The enlarged view of the corner | angular part of Example 1 with which the portable display terminal was mounted | worn is shown. Sectional drawing which shows the state which made the corner | angular part of Example 1 collide with a rigid surface from a different direction is shown. An example of the back side shape of Example 1 is shown. Example 2 of the protective cover of the portable display terminal of the present invention in which a lid is arranged will be shown.

  In order to explain the protective cover of the portable display terminal of the present invention, it will be described in the following examples.

  FIG. 1 is a perspective view showing Example 1 of a protective cover for a portable display terminal according to the present invention. The entire protective cover 1 of the portable display terminal is integrally formed of a single elastic material. The four bag-shaped beam portions 2, 3, 4, and 5 corresponding to substantially rectangular sides form the entire outer shape, and the four orthogonal points 3 from the protective cover corner portions 6, 7, 8, and 9 are orthogonal to each other. A plurality of convex ribs protruding in the direction and extending along the protective cover corners 6, 7, 8, 9 are formed independently.

  The plurality of convex ribs are formed on the substantially rectangular surface of the protective cover parallel to the display surface of the portable display terminal in which the outer edge portion is housed in the four bag-shaped beam portions 2, 3, 4, and 5. On the other hand, the side convex ribs 10, 11, 12, 13 projecting outward in the parallel direction from the four corners 6, 7, 8, 9 of the protective cover, and the upper convex projecting outward in the perpendicular direction perpendicular to the four protective cover corners 6, 7, 8, 9 The ribs 14, 15, 16, and 17 and the lower convex ribs 18, 19, 20, and 21 are included.

  A plurality of projecting portions 22 projecting from the back protective cover surface, which is the lower side of the four bag-shaped beam portions 2, 3, 4, 5 corresponding to the back surface side of the outer edge portion of the portable display terminal to be housed. Provided with the same elastic material. The protruding portion 22 has a protruding amount in contact with the same plane together with the lower convex ribs 18, 19, 20, and 21 in a state where the portable display terminal is accommodated. A plurality of linear ribs 23 are formed by connecting the adjacent protrusions 22 with the same elastic material. The plurality of protrusions 22 and the linear ribs 23 to be connected are formed as a substantially rectangular shape closed on the back protective cover surface of the protective cover 1 of the portable display terminal. The protruding amount of the linear rib 23 is smaller than that of the protruding portion 22. When the linear rib 23 covers the portable display terminal and is placed on a desk or the like, a gap is formed between the surface of the desk and the back surface. It is made to release the heat from.

  FIG. 2 is a perspective view showing Example 1 of the protective cover of the portable display terminal of the present invention attached to the portable display terminal. The outer edge portion of the portable display terminal 25 having the display surface 24 on the front side is covered with the protective cover 1 of the portable display terminal. As an example of a specific shape of the portable display terminal 25, the center thickness is about several tens of millimeters, the outer edge portion is as thin as about 10 millimeters, is substantially rectangular, and has four corners of arcuate housings. . The display surface 24 is made of a relatively thick glass of about 8 millimeters, and the display is generally made of liquid crystal.

  The portable display terminal 25 is formed of a hard resin or the like from the outer edge including the four corners of the housing to the entire back surface. Circuits, batteries, and the like are arranged inside the housing, and the overall weight is 1 kilogram or less. Even when the weight is 1 kilogram or less, the impact acceleration applied to the housing when dropped on a hard ground from a height of 1 meter or more often exceeds 1000 G, and the impact force is large. The material and structure of the housing are limited in selection on the premise that the whole is lighter and thinner, the impact acceleration cannot be reduced, and the glass and the inside of the display surface are easily damaged.

  When an object falls on a collision surface such as the ground and receives an impact, the impact height applied to the object increases as the fall height increases and the object and the collision surface become harder. As a result, the destruction of the part constituting the object proceeds. By increasing the time from the start of the collision until the object stops, the impact acceleration is reduced, and in the same sense, the maximum impact force is reduced. By increasing the deformation of the elastic material at the impacted portion, the impact acceleration and the maximum impact force are reduced, the impact energy is absorbed by heat conversion, etc., and the impact force is distributed over a wide area. Furthermore, it corresponds to the second or lower collision while the object rotates due to the generation of a rotational moment due to the fact that the center of gravity of the falling object and the first collision location are not on a straight line perpendicular to the collision surface.

  The portable display terminal 25 collides with the ground from the corner of the housing with a high probability when dropped. The protective cover 1 of the portable display terminal alleviates the impact at the time of the first collision by projecting the elastic material from the arc-shaped protective cover corners 6, 7, 8, 9 in a plurality of directions outside. The protective cover 1 of the portable display terminal needs an appropriate hardness to keep its shape, and cannot be made to have a low hardness only to absorb impact energy.

  In order to reduce the impact caused by dropping with an elastic material having an appropriate hardness, the protective cover 1 of the portable display terminal is not simply formed by thickening the arc-shaped protective cover corners 6, 7, 8, 9 in any direction. It has a shape that partially protrudes in multiple directions so that it can be easily deformed even in the event of a collision, reducing the impact force, absorbing the impact energy, and dispersing the impact force over a wide area of the arc-shaped housing corner Measure.

  The protective cover 1 of the portable display terminal is provided with a plurality of convex ribs protruding outward at positions corresponding to the four corners of the portable display terminal 25. All are made into the shape which followed the arc-shaped housing | casing corner | angular part substantially along. The side convex ribs 10, 11, 12, 13 that protrude outwardly facing the protective cover corners 6, 7, 8, 9 in the direction parallel to the display surface 24 are protective cover angles in the direction perpendicular to the display surface 2. Upper convex ribs 14, 15, 16, and 17 and lower convex ribs 18, 19, 20, and 21 protruding outward from the upper and lower portions of the portions 6, 7, 8, and 9 are formed.

  The change in the external shape due to the mounting of the protective cover 1 of the portable display terminal is largely due to the protective cover corners 6, 7, 8, 9 and the projections 22 and the linear ribs 23 on the back protective cover surface. A thickness of about 1.5 millimeters is added, and the protective cover corners are made small enough to project locally in three directions orthogonal to each other by about 7 millimeters. The addition of the outer shape on the back protective cover surface is not a substantial addition because the outer edge portion is thinned. The weight of the protective cover 1 of the portable display terminal is about 80 grams, and the weight addition is relatively small.

  FIG. 3 is a front view showing Example 1 attached to the portable display terminal. A part of the protective cover 1 of the portable display terminal is cut away to show the case corner 26 of the substantially rectangular portable display terminal 25. Four corner portions 26 are formed in an arc shape. Protective cover corners 6, 7 (not cut out), 8, 9 side convex ribs 10, 11 (not shown), 12, 13, upper convex ribs 14, 15 (not shown) , 16, 17 and the lower convex ribs 18, 19, 20, 21 (all not shown) are formed in an arc-shaped independent shape along four arc-shaped housing corners 26. .

  FIG. 4 is an enlarged cross-sectional view of the protective cover corner of the portable display terminal of the present invention. 4A is an enlarged cross-sectional view of the portion shown in FIG. 3, and FIG. 4B is an enlarged cross-sectional view in which the amount of protrusion from the side portion 27 is partially increased. Portions common to the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals. As shown in FIG. 4 (a), the protective cover 1 of the portable display terminal covers the casing 28 of the portable display terminal 25 and the outer edge of the glass forming the display surface 24 in close contact with each other. A side convex rib 10 that protrudes outward in a direction parallel to the side portion 27 of the housing 28, and an upper convex rib 14 that protrudes outward from the top and bottom of the side portion 27 in a direction perpendicular to the display surface 24. A lower convex rib 18 is arranged.

  The outer convex portions 14, 30 of the upper convex rib 14, and the lower convex rib 18 are positioned so as to protrude outward from the side portion 27 of the housing 28, so that the side convex rib 10, the upper convex rib 14, and When an impact force is applied to the lower convex rib 18, the lower convex rib 18 is dispersed on the relatively strong side portion 27 with a three-dimensional structure of an arc shape and a bent portion. Since most of the impact force is distributed to the side portion 27 of the housing 28 due to the deformation due to the impact force, the degree of destruction is greatly reduced.

  When falling on the ground in a direction substantially parallel to the display surface 24, the upper convex rib 14 is deformed to reduce the impact, and the impact force is applied to the side portion 27 of the housing 28. When it falls to the ground in a direction of approximately 45 degrees with respect to the display surface 24, either the side convex rib 10 or the upper convex rib 14 hits first, the whole is deformed to reduce the impact, and the impact force Is added to the side portion 27 of the housing 28. Even if it falls to the ground in the opposite direction of approximately 45 degrees, either the side convex rib 10 or the lower convex rib 18 hits first, and the whole is deformed to reduce the impact and similarly to the impact force. Many are added to the side 27 of the housing 28. Further, if the display surface 24 falls to the ground in a direction that makes a large angle (the display surface 24 or the back side 32 of the housing 28 is parallel to the ground), the upper convex rib 14 or the lower convex rib 18. Alone receives the first impact, causes deformation at the long arc-shaped portion, and widely spreads the impact force on the side portion 27 of the housing 28.

  Due to the deformation of the elastic material, the impact acceleration and the maximum impact force, which are defined in principle by the mass and speed, and the time from the collision to the stationary time, are reduced, and the impact energy is internally reduced along with the deformation of the elastic material. It is converted and absorbed as thermal energy. Further, dispersing the impact force applied to the casing 28 to be protected by area means that the casing 28 is continuously deformed while the side convex ribs 10, the upper convex ribs 14, and the lower convex ribs 18 are continuously deformed. This can be achieved by increasing the area of contact with the shock and transmitting the impact. Since the side convex ribs 10, the upper convex ribs 14, and the lower convex ribs 18 are continuously formed along the arc-shaped side portions 27 of the housing 28, the side convex ribs 10 have a large angle with the direction of the display surface 24. The more it falls to the ground in the direction it makes (the display surface 24 and the ground are nearly parallel), the longer the arc-shaped part that can collide and hit by deformation, and the impact force is distributed over a large area, and the display The possibility of damaging the glass forming the surface 24 and the back surface of the housing 28 is reduced.

  After any of the side convex ribs 10, the upper convex ribs 14, and the lower convex ribs 18 first collides with the ground, a rotational moment is generated because the collision location and the center of gravity are not on a straight line perpendicular to the ground, While deforming any one of the convex ribs, other portions continuously collide. Alternatively, if the rotational moment is relatively small and a considerable amount of impact energy is not converted into heat conversion, sound or vibration and remains as repulsive energy, the case will spring up again and the four other corners of the protective cover Collide with any convex rib. This process is repeated, and the higher the degree of shock absorption in the shape and material of the convex rib, the faster it stops. Naturally, a large sound and vibration at the time of collision means a large impact force, and in order to reduce them, it is necessary to have a large impact absorbability due to the deformation of the convex rib.

  The protective cover 1 of the portable display terminal covers the front protective cover surface 31 covering the outer edge of the glass constituting the display surface 24 and the back surface 32 of the housing 28 in addition to the portion covering the side portion 27 of the housing 28. The back protective cover surface 33 is continuously made of the same elastic material. The rear protective cover surface 33 that covers the back surface 32 of the housing 28 is formed with a protruding portion 22 that protrudes to the outside, and the back surface 32 of the housing 28 is protected from impact in the course of a collision that occurs multiple times.

  FIG. 4B shows an enlarged cross-sectional shape in which the protruding amount of the side convex rib 34 from the side portion 27 of the housing 28 is partially increased. A part of the outer side portions 37 and 38 of the upper convex rib 35 and the lower convex rib 36 is formed at a position further protruding from the side portion 27. The upper convex rib 35 and the lower convex rib 36 are disposed above and below the side portion 27 of the housing 28. Due to the impact at the time of dropping, the side convex ribs 34 are more easily deformed, and the upper convex ribs 35 and the lower convex ribs 36 are also easily deformed following. The configuration is such that the side portion 27 of the casing 28 receives a large amount of impact force.

  FIG. 5 is an enlarged view showing a corner portion of the protective cover according to the first embodiment of the present invention. 5A corresponds to the enlarged sectional view shown in FIG. 4A, and FIG. 5B corresponds to the enlarged sectional view shown in FIG. 4B. In FIG. 5 (a), the shape of the side convex rib 10 is an arc shape that is a part of a concentric circle with the arcuate casing corner indicated by a broken line, and is formed with a uniform protrusion amount. . The upper convex rib 14 and the lower convex rib 18 (not shown) are also formed in an arc shape that is a part concentric with the corner portion of the housing.

  In FIG. 5B, the shape of the side convex rib 34 is a more protruding shape having a portion with a larger curvature than that of the arcuate housing corner indicated by the broken line, and the upper convex rib 35. , And the lower convex rib 36 (not shown) is also shaped to have an arcuate portion with a large curvature.

  FIG. 6 is an enlarged cross-sectional view of the first embodiment of the present invention, in which the corner shown in FIG. 4A collides with a rigid plane such as the ground from different directions (in different postures) to form a plurality of convex ribs. The cross-sectional view shows the state of the process of deformation due to collision. The part shown with a broken line shows the shape of the some convex rib before a collision, and the thick solid line with a code | symbol shows the rigid plane which collides. What should be noted here is a case where a space between the plurality of convex ribs is filled. If the corners of the case are covered with an elastic material that is almost the same thickness, the elastic material cannot be deformed very much at the time of collision, so the impact acceleration and maximum impact force cannot be reduced, and the absorption of impact energy is also small. It is difficult to prevent damage to the portable display terminal. By providing a plurality of convex ribs of elastic material projecting in three directions orthogonal to the corners of the protective cover, compression deformation, bending deformation, and extension deformation are easily generated in combination, and the amount of deformation at the time of impact application is increased. .

  In FIG. 6 (a), there is a collision state in which the entire surface collides with the rigid plane AA in the direction of an arrow substantially parallel to the display surface 24, and the side convex rib 10 is crushed and deformed to expand in the width direction. Indicated. The upper convex ribs 14 and the lower convex ribs 18 are pushed in a little and float up and down the side portions 27 of the housing 28, but almost receive an impact force at the side portions 27 of the housing 28. The side portion 27 of the housing 28 shown in cross section is formed in an arc shape and is bent at the lower portion, so that the structural strength is relatively large and can withstand a certain level of impact force. Due to the deformation that the side convex rib 10 is largely crushed, the impact acceleration and the maximum impact force are reduced, and most of the collision energy can be converted into heat and absorbed.

  FIG. 6B shows a state where the entirety collides with the rigid plane BB in the direction of the arrow slightly tilted from the direction parallel to the display surface 24, and the side convex ribs 10 are crushed and deformed. Show. The side convex ribs 10 are crushed into a shape that is greatly inclined to one side and swells, and the upper convex ribs 14 and the lower convex ribs 18 are deformed asymmetrically and are slightly raised above the side portions 27 of the housing 28. Due to the deformation, the impact acceleration and the maximum impact force are reduced, and a lot of collision energy is absorbed. Most of the impact force is received by the side portion 27 of the housing 28, and a part is shared near the lower portion of the side portion 27.

  FIG. 6 (c) shows a state in which the entire side convex rib 10 and the lower convex rib 18 are deformed by colliding with the rigid plane CC in the direction of the arrow inclined by 45 degrees with respect to the display surface 24 as a whole. Show. The side convex ribs 10 are greatly inclined and crushed only on one side, the next lower convex rib 18 is pushed, and the elastic material between the side convex ribs 10 and the lower convex ribs also undergoes elongation deformation. By these deformations, the impact acceleration and the maximum impact force are reduced, and a lot of collision energy is absorbed. The impact force is large at the side portion 27 of the housing 28 and is considerably received at the lower portion of the side portion 27.

  FIG. 6D shows a state in which the entire side convex rib 10 and the upper convex rib 14 are deformed by colliding with the rigid plane DD in the direction of the arrow tilted approximately 45 degrees with the display surface 24. . The deformation approximated to FIG. 4C is shown, and the amount of deformation of the lower convex rib 18 is reduced by the amount of deformation of the upper convex rib 14. The impact force is large at the side portion 27 of the housing 28 and is considerably received at the upper portion of the side portion 27.

  FIG. 6E shows a state in which the entire upper rib is deformed by colliding with the rigid plane EE in the direction of the arrow that is largely inclined from the display surface 24. The upper convex rib 14 is crushed, and the side convex rib 10 is pushed downward to show a state of being deformed as a whole. Most of the impact force is received near the upper portion of the side portion 27 of the housing 28.

  As shown in FIG. 6A, the deformation near the state shown in the cross-sectional view occurs for a longer time as the collision of the colliding rigid plane and the display surface 24 is nearly orthogonal. In FIG. 6B to FIG. 6E, the smaller the mutual inclination of the rigid plane and the display surface 24, the greater the position of the collision location and the center of gravity shift from the orthogonal direction of the rigid plane. The moment is large, one of the convex ribs is collided and deformed, and the convex ribs at the corners of the other protective cover hit and change them quickly while changing the inclination to the direction of the center of gravity, or they rotate themselves While jumping up, it collides with the convex ribs at the other corners of the protective cover, attenuates and stops.

  The display surface and the falling surface, which is a rigid plane, show only a part of the state in FIG. 6, and many have various collision postures having a three-dimensional inclination. However, when falling, the shape is determined so that it first collides with one of the convex ribs at one of the four corners of the protective cover, so that deformation of the convex rib at the time of collision, impact acceleration and maximum impact Reducing the force, spreading the impact force over a wide area on the side surface and its vicinity, and absorbing the impact energy are not fundamentally different.

  The side convex ribs 10, the upper convex ribs 14, or the lower convex ribs 18 of an elastic material that protrudes outward from the side portions 27 of the housing 28 in the horizontal direction and the vertical vertical direction with respect to the display surface 24. By arranging along the side portion 27 of the housing 28, any of the convex ribs at the four corners of the protective cover collide with the ground first to cause a large deformation, regardless of the collision from any direction. Acceleration and maximum impact force are reduced, and impact energy is quickly attenuated. Further, the impact force is distributed to the side portion 27 of the housing 28 and a widened area in the vicinity thereof, as compared with the case where the bare housing corner collides with the ground.

  Depending on the collision direction, the side convex ribs 10, the upper convex ribs 14, or the lower convex ribs 18 share a large amount of deformation, and the side portions 27 of the housing 28 receive most of the impact force over a wide area. Become. The deformation is caused by a combination of compression deformation, elongation deformation, and bending deformation, and depending on the collision direction, any deformation is mainly performed. In order to increase these deformations and disperse the impact force over a relatively large area, the configuration of the protective cover of the portable display terminal of the present invention is effective.

  FIG. 7 shows the back side shape of the protective cover of the portable display terminal of the present invention in Example 1. In the protective cover 1 of the portable display terminal that covers the outer edge of the back surface 32 of the housing, a plurality of protrusions 22 are provided on the back protective cover surface 33 of elastic material, and the space between the protrusions 22 extends from the back protective cover surface 33. They are connected by the thickened linear ribs 23. The linear rib 23 has a smaller protruding amount from the back protective cover surface 33 than the protruding portion 22, for example, a smooth shape in which the protruding amount changes continuously. The protruding portion 22 and the linear rib 23 are formed in a substantially rectangular closed shape along the outer edge portion of the back surface 32 of the housing, so that the entire back protective cover surface 33 of the protective cover 1 of the portable display terminal is formed. Elongation tension becomes large, and it becomes difficult for the protective cover 1 of the portable display terminal to be detached due to the impact force of hand or dropping. On the inner side of the protruding portion 22 and the linear rib 23, a cutout portion 39 having no elastic material is formed, and the weight of the protective cover 1 of the portable display terminal is reduced.

  The plurality of projecting portions 22 are projected so as to be in contact with the same plane as the lower convex ribs 18, 19, 20, and 21, so that the portable display terminal is stably installed. By setting each protruding tip to a position that protrudes from the back surface 32 of the housing, any of the protruding portions 22 hits the ground in the process of collision at the time of falling, so that the impact is mitigated and the back surface 32 does not directly collide with the ground. Damage can be prevented.

  Since a battery or the like is disposed near the center inside the portable display terminal, the back surface 32 is formed thin near the outer edge. If it is used as it is, it will be slippery when held by holding the outer edge with your hand or when it is placed on the knee. The protective cover 1 of the portable display terminal made of an elastic material such as rubber that covers the outer edge portion of the back surface 32 is further prevented from slipping by the protruding portions 22 and the linear ribs 23.

  FIG. 8 shows a second embodiment of the protective cover for the portable display terminal of the present invention. FIG. 8A shows a configuration in which a lid is arranged on the front surface of the portable display terminal indicated by a broken line covered with the protective cover 1 of the portable display terminal. Holes 41, 42, 43, and 44 of the flat lid 40 are fitted into the upper convex ribs 14, 15, 16, and 17, and the portable display terminal whose lid 40 is indicated by a broken line has a display surface on the front side. Cover the whole.

  The holes 41, 42, 43, and 44 do not have to match the outer shape of the upper convex ribs 14, 15, 16, and 17, and only need to substantially match the outer shape. The distance between the center positions of the arc-shaped portions of the holes 41, 42, 43, and 44 in the lid 40 needs to be slightly smaller than the distance between the arc-shaped centers at the outer portions of the upper convex ribs 14, 15, 16, and 17. There is. If the horizontal interval is 1 mm or more and the long vertical interval is 1.5 mm or more, the lid 40 is stably held by the elastic force of the protective cover 1 of the portable display terminal. The shape of the holes 41, 42, 43, 44 is made to substantially coincide with the outer portions of the plurality of upper convex ribs 14, 15, 16, 17, and each upper convex rib is sandwiched by another part of each hole. But you can.

  The lid 40 can be easily attached and removed, and the upper convex ribs 14, 15, 16, and 17 form a relatively large space between the floor and the ground. Even if it falls on uneven ground, it does not directly hit the display surface, and damage to the display surface can be reduced. In addition, it is possible to reduce adhesion of dirt on the hand when carrying. By using an elastic material for the lid 40, it is possible to alleviate the direct impact on the display surface without obstructing the deformation behavior of the plurality of independent convex ribs at the protective cover corners 6, 7, 8, and 9. Because it is a shape, it can be created by punching.

  FIG. 8B shows a configuration in which a lid 40 is disposed on the back surface of the portable display terminal covered with the protective cover 1 of the portable display terminal. When the portable display terminal is used, the lid 40 can be attached and stored on the back surface without being left unattended. By using the lid 40 that is flat and has a material and shape that are difficult to slip, it can be made difficult to slip from the knee or the like.

  The lid 40 has a shape corresponding to the concavo-convex shape of the protective cover back surface 33, is fitted and held in the lower convex ribs 18, 19, 20, and 21, and has a substantially rectangular outer shape that avoids the plurality of protrusions 22. Is done.

DESCRIPTION OF SYMBOLS 1 Protective cover of portable display terminal 6, 7, 8, 9 Protective cover corner 10, 11, 12, 13, 34 Side convex ribs 14, 15, 16, 17, 35 Upper convex ribs 18, 19, 20, 21, 36 Lower convex rib 22 Projection 23 Linear rib 24 Display surface
25 Portable Display Terminal 26 Case Corner 27 Side 28 Case 32 Back 33 Back Protection Cover 40 Lid 41, 42, 43, 44 Hole

Claims (8)

  Side that is integrally molded with an elastic material in a shape that covers the outer edge of the casing of the flat, substantially rectangular portable display terminal, and protrudes in a direction parallel to the substantially rectangular surface from the four corners of the protective cover A protective cover for a portable display terminal, in which an upper convex rib and a lower convex rib protruding in the vertical direction perpendicular to the upper portion and the lower convex rib are independently formed in a shape along an arcuate casing corner.   The thickness of the side convex rib is equal to or less than the thickness of the casing corner of the portable display terminal to be covered, and the outer surfaces of the upper convex rib and the lower convex rib are above and below the corner of the casing. The protective cover of the portable display terminal according to claim 1, wherein the protective cover is formed at a position outside the edge of the substrate in a direction parallel to the substantially rectangular surface.   The said side convex rib has the outer shape which has a curvature larger than the said arcuate case corner | angular part of the portable display terminal covered in the surface parallel to a substantially rectangular surface. 2. A protective cover for the portable display terminal according to 2.   The plurality of projecting portions are projected at a position along the outer edge portion of the casing of the portable display terminal to be covered so as to contact the same plane as the lower convex rib formed of the same elastic material. A protective cover for a portable display terminal according to claim 3.   A plurality of linear ribs are arranged in a position along the outer edge portion of the casing of the portable display terminal to be covered, and are connected to each other between the adjacent protruding portions, and are identical to the substantially rectangular shape closed together with the protruding portions. The protective cover of the portable display terminal according to claim 4, which is made of an elastic material.   The substantially rectangular lid in which a plurality of holes that can be fitted to the four upper convex ribs are formed is detachably disposed on the front side of the portable display terminal. The protective cover of the portable display terminal in any one.   The portable display terminal according to claim 6, wherein the lid can be fitted to the lower convex rib in the hole, and is detachably attached to the back side of the portable display terminal so as not to cover the protrusion. Protective cover.   The protective cover of the portable display terminal according to claim 6, wherein the lid is formed of an elastic material.

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