JP6561705B2 - Information processing device - Google Patents

Description

  The present invention relates to an information processing apparatus.

  In recent years, in order to access information regardless of time and place, many thin and lightweight small information processing devices such as tablet terminal devices have become widespread. Since such a small information processing apparatus is often carried, there are many cases where it is accidentally dropped.

  On the other hand, in such a small information processing apparatus, there is a great demand for reduction in thickness, weight and size, and cost reduction is an important matter for manufacturers, and it is difficult to take measures for robustness. However, a small information processing apparatus has extremely low impact resistance because extremely precise electronic components are built in at a high density. For this reason, if it is accidentally dropped, the information processing apparatus is damaged, and there is a high risk of malfunction or inoperability.

  From such a viewpoint of impact resistance, a conventional technique for projecting the four corners of the housing in the screen direction in a small information processing apparatus has been proposed. As described above, there is a conventional technique that prevents the cover glass from coming into direct contact with the ground by protruding the four corners of the housing in the screen direction and prevents the cover glass from cracking due to falling.

JP 2014-99686 A

  However, for example, a tablet-type terminal device has a center of gravity on the side where a touch panel or the like is mounted. Therefore, when the tablet-type terminal device falls down the corner, there is a high possibility that the corner will fall in the direction of the center of gravity, that is, the touch panel direction after the corner contacts the ground. In that case, since the force from the top is applied to the tablet-type terminal device due to falling while falling in the direction of the touch panel, the case warps in a manner that pushes the touch panel surface. When the casing is extended in such a way as to push out the touch panel surface, the tablet terminal device is bent in the direction in which the touch panel is pulled.

  In this respect, since the touch panel uses tempered glass, the touch panel has a certain level of resistance against impacts from the front, but has a relatively weak structure for pulling due to its characteristics. Therefore, when a tablet-type terminal device fell, there was a high possibility that the touch panel would be pulled and cracked.

  Further, even when the conventional technique for projecting the four corners of the casing in the screen direction is used, the same action is performed when the corner is dropped, and it is difficult to prevent the touch panel from being damaged.

  The disclosed technique has been made in view of the above, and an object thereof is to provide an information processing apparatus that reduces damage caused by dropping.

In one aspect, an information processing apparatus disclosed in the present application has a display screen. The first member has a first surface on which the screen is mounted. The second member is engaged with the first member to form a plate-shaped housing having an internal space and having the first surface as one surface, and is opposite to the first surface of the housing. Side second surface. The third member is fixed and arranged in the internal space with respect to the first member and the second member. Boss is arrange | positioned in the four corner vicinity of the said housing | casing so that it may protrude in the direction of the said 2nd member from the wall of the said internal space of the said 1st member. The connecting member connects the boss and the side walls of the four corners of the first member. The contact member extends from the boss so as to contact the third member disposed in the internal space.

  According to one aspect of the information processing apparatus disclosed in the present application, there is an effect that damage caused by dropping can be reduced.

FIG. 1 is a perspective view of a tablet terminal device as viewed from the touch panel side. FIG. 2 is a perspective view of the tablet terminal device as viewed from the rear cover side. FIG. 3 is an exploded perspective view of the tablet terminal device. FIG. 4 is a plan view of the tablet terminal device. FIG. 5A is a perspective view of a corner portion of the tablet terminal device according to the first embodiment. FIG. 5B is a perspective view of a corner portion of the tablet terminal device according to the first embodiment when viewed from another angle. FIG. 6 is a plan view of a corner portion of the tablet terminal device according to the first embodiment. FIG. 7 is a diagram for explaining a state where the tablet-type terminal device falls with its corners facing down. FIG. 8 is a perspective view of a corner portion of the tablet terminal device according to the first modification. FIG. 9 is a side view of a corner portion of the front cover according to the second modification. FIG. 10 is a side view of a corner portion of the front cover according to the third modification. FIG. 11 is a perspective view of the core cover according to the second embodiment. FIG. 12 is a perspective view of the core cover in which the screwing points are arranged at positions away from the corners. FIG. 13 is a diagram illustrating the force applied to the tablet terminal device in which the screwing point is located at a position away from the corner. FIG. 14 is a perspective view of a corner portion of the front cover according to the third embodiment. FIG. 15 is a diagram illustrating a state in which the front cover and the core cover according to the third embodiment are fitted. FIG. 16 is a perspective view of a corner portion of the tablet terminal device according to the fourth modification.

  Embodiments of an information processing apparatus disclosed in the present application will be described below in detail with reference to the drawings. The information processing apparatus disclosed in the present application is not limited by the following embodiments.

  FIG. 1 is a perspective view of a tablet terminal device as viewed from the touch panel side. FIG. 2 is a perspective view of the tablet terminal device as viewed from the rear cover side.

  The tablet terminal device 100 includes a touch panel 1, a front cover 2, and a rear cover 3. The touch panel 1 is disposed on the front cover 2. Further, the front cover 2 and the rear cover 3 on which the touch panel 1 is mounted are combined and fitted to form a single housing having a space inside.

  Hereinafter, a direction from the rear cover 3 toward the touch panel 1 is referred to as a Z direction, and a direction from the touch panel 1 toward the rear cover 3 is referred to as a reverse Z direction. Also, the direction of the arrow in the figure in the short direction of the tablet terminal device 100 is referred to as the Y direction, and the opposite direction is referred to as the reverse Y direction. Also, the direction of the arrow in the figure in the longitudinal direction of the tablet terminal device 100 is referred to as the X direction, and the opposite direction is referred to as the reverse X direction.

  FIG. 3 is an exploded perspective view of the tablet terminal device. The tablet-type terminal device 100 is assembled by stacking the rear cover 3, the core cover 4, the internal component 5, the front cover 2, and the touch panel 1 in the Z direction.

  The touch panel 1 has a liquid crystal display, for example. The touch panel 1 displays an image on the display. The touch panel 1 receives an input of a pressed position on the screen when the display is pressed. The touch panel 1 corresponds to an example of a “display screen”.

  The front cover 2 has a frame for fitting the touch panel 1. The front cover 2 includes a cover around the touch panel 1 of the tablet terminal device 100 and a side cover. The front cover 2 on which the touch panel 1 is mounted is combined with the core cover 4 to cover the internal component 5 assembled to the core cover 4. The front cover 2 is an example of a “first member”. The mounting surface of the touch panel 1 on the front cover 2 corresponds to an example of “first surface”.

  The internal component 5 is a component group that realizes various functions of the tablet terminal device 100 including the main board. In addition, the internal component 5 includes a hard disk, a communication device, a speaker, a connection cable, and the like.

  The core cover 4 is a member for assembling the internal component 5. The core cover 4 is covered with the front cover 2 and the rear cover 3 with the internal component 5 attached. Specifically, a main board on which a CPU (Central Processing Unit) is mounted is attached to the core cover 4. Furthermore, for example, a W-LAN (Wireless Local Area Network) antenna, a speaker, a microphone, and the like are attached to the core cover 4.

  The outside of the core cover 4 is covered by the front cover 2 and the rear cover 3. That is, the core cover 4 is disposed in an internal space formed by combining the front cover 2 and the rear cover 3.

  Further, the core cover 4 in the present embodiment is provided with a waterproof packing at a place where it is in contact with the front cover 2. The waterproof packing is disposed so as to surround the components mounted on the core cover 4. This waterproof packing prevents water from entering the parts mounted on the core cover 4 from the outside. However, when it is not necessary to improve waterproofness, waterproof packing may not be provided. The core cover 4 is an example of a “third member”.

  The rear cover 3 covers the surface of the core cover 4 on the side opposite to the front cover 2. The rear cover 3 is fitted to the front cover 2 with the core cover 4 interposed therebetween, and is coupled to the rear cover 3 by a fastener such as a screw. A battery or the like may be disposed between the rear cover 3 and the core cover 4. The rear cover 3 is an example of a “second member”. Further, the surface of the rear cover 3 facing in the direction opposite to the front cover 2 is an example of the “second surface”. The tablet terminal device 100 has a plate-shaped housing formed by combining and fitting the front cover 2 and the rear cover 3 together.

  FIG. 4 is a plan view of the tablet terminal device. The tablet terminal device 100 has four corners 21 to 24 formed by the front cover 2. Hereinafter, when each of the four corners is not distinguished, it is referred to as “corner 20”. The corner 20 is formed to draw a curve.

  FIG. 5A is a perspective view of a corner portion of the tablet terminal device according to the first embodiment. Moreover, 5B is the perspective view which looked at the corner | angular part of the tablet-type terminal device which concerns on Example 1 from the other angle.

  As shown in FIGS. 5A and 5B, the front cover 2 has a protrusion 201 at a corner 20. The protrusion 201 is provided in the thickness direction at the corner 20, that is, in the vicinity of the surface on which the touch panel 1 in the Z direction is disposed. In the case of the tablet terminal device 100 according to the present embodiment, the thickness of the side surface is 11.7 mm, and the protrusion 201 is preferably provided at a position where the distance from the surface of the touch panel 1 is greater than 1.5 mm and 2 mm or less. . Specifically, the protrusion 201 is formed by increasing the thickness of a portion corresponding to the protrusion 201 of the front cover 2.

  FIG. 6 is a plan view of a corner portion of the tablet terminal device according to the first embodiment. A broken line curve shown in FIG. 6 represents a curve formed by the protrusion 201. The alternate long and short dash line curve represents a curve formed by an unthickened portion at the corner 20. Below, the part which is not made thick in the corner | angular 20 is called "normal part." R1 represents the radius of the curve formed by the protrusion 201. R2 represents the radius of the curve formed by the normal portion. Here, R1 is formed to be longer than R2. That is, the protrusion 201 is formed so that the curvature thereof is smaller than the curvature of the normal portion. Then, the curve of the protrusion 201 is converged to the curve of the normal part in the region other than the corner 20. Thereby, the protrusion 201 can be provided only by expanding the corner 20 of the tablet terminal device 100 to the outside without increasing the vertical and horizontal dimensions. That is, the size of the downsized tablet terminal device 100 can be maintained while taking measures against impact resistance.

  Thus, by providing the protrusion 201 on the touch panel 1 side in the corner 20, when the tablet terminal device 100 falls with the corner 20 down, the protrusion 201 first comes into contact with the ground. Below, with reference to FIG. 7, the state of the tablet-type terminal device 100 when the tablet-type terminal device 100 falls with the corner 20 facing down will be described. FIG. 7 is a diagram for explaining a state where the tablet-type terminal device falls with its corners facing down.

  Here, the case where the tablet terminal device 100 falls downward in FIG. 7 will be described. As shown in FIG. 7, when the tablet-type terminal device 100 falls, first, the protrusion 201 contacts the ground. With the projection 201 in contact with the ground, the center of gravity of the tablet terminal device 100 is closer to the rear cover 3 than the projection 201. Therefore, the tablet terminal device 100 is inclined to the rear cover 3 side, that is, the side opposite to the touch panel 1 with the protrusion 201 as a vertex.

  In this state, a load P1 of the tablet terminal device 100 is applied to the tablet terminal device 100 downward in FIG. Therefore, the front cover 2 and the touch panel 1 are bent in the direction in which the touch panel 1 is crushed with the protrusion 201 as a vertex. That is, a contracting force is applied to the touch panel 1. In this way, the touch panel 1 can be prevented from being damaged by applying a force in the direction opposite to the pulling direction to the touch panel 1.

  As described above, the tablet terminal device according to the present embodiment has protrusions on the touch panel side at the four corners. Thereby, it is possible to avoid applying a force in the direction of being pulled by the touch panel when the corner is dropped, and to reduce damage to the touch panel.

  In particular, as a result of the simulation using the tablet-type terminal device according to the present embodiment, the strength was improved by 30% when dropped with the weakest corner of the four corners down. As a result of the simulation, it was confirmed that the tablet-type terminal device was not damaged even when dropped from 122 cm in a test corresponding to the MIL (Military Standard) standard.

  In addition, the tablet-type terminal device according to the present embodiment can improve the impact resistance simply by making a part of the front cover thick, and there are no additional parts. Costs can be reduced. Furthermore, since the vertical and horizontal dimensions do not change even when the protrusions are provided, the impact resistance performance can be improved without affecting the size and weight of the tablet terminal device.

(Modification 1)
FIG. 8 is a perspective view of a corner portion of the tablet terminal device according to the first modification. The front cover 2 according to the present modification forms a curve R3 from the normal part on the rear cover 3 side toward the protrusion 201 at the corner 20 to smoothly connect the normal part and the protrusion 201. That is, the front cover 2 has a configuration that smoothly spreads outward from the normal portion toward the protrusion 201.

  Thus, even if the tablet terminal device has a smooth curve from the rear cover side to the protrusion, damage to the touch panel can be reduced as in the first embodiment. Further, by forming a shape having a smooth curve from the rear cover side to the protrusion, the protrusion can be provided in a form that is adapted to the design before the protrusion is attached. That is, the impact resistance can be improved without deteriorating the design of the tablet terminal device.

(Modification 2)
FIG. 9 is a side view of a corner portion of the front cover according to the second modification. The front cover 2 according to this modified example smoothly connects the normal portion and the protrusion 201 at a corner 20 by an inclined surface having an inclination from the normal portion on the rear cover 3 side toward the protrusion 201. That is, the front cover 2 has a configuration in which the front cover 2 linearly extends outward from the normal portion toward the protrusion 201.

  Thus, even if the tablet-type terminal device has a shape having an inclined surface from the rear cover side toward the protrusion, damage to the touch panel can be reduced as in the first embodiment.

(Modification 3)
FIG. 10 is a side view of a corner portion of the front cover according to the third modification. The front cover 2 according to this modification has a stepped surface at the corner 20 from the normal part on the rear cover 3 side toward the protrusion 201. That is, the front cover 2 has a configuration in which the front cover 2 gradually expands outward from the normal portion toward the protrusion 201.

  Thus, even if the tablet-type terminal device has a stepped surface from the rear cover side toward the protrusion, damage to the touch panel can be reduced as in the first embodiment.

  As described above, four types of corner shapes are presented here, but the corner shapes are not limited to this as long as they have a protrusion on the touch panel side.

  Next, Example 2 will be described. The tablet-type terminal device according to the present embodiment has a structure in which screwing locations are arranged near the four corners. Below, the screwing location of the four corners in the tablet-type terminal device concerning a present Example is demonstrated concretely.

  In the tablet terminal device 100 according to the present embodiment, the front cover 2 is connected and fixed to the core cover 4 near the four corners with screws. Here, in this embodiment, a screw that connects the front cover 2 and the core cover 4 will be described as an example, but this may be a screw that connects the front cover 2 and the rear cover 3.

  FIG. 11 is a perspective view of the core cover according to the second embodiment. The inner cover 5 is assembled to the core cover 4 so as not to be disposed near the corner 20. And since the internal component 5 is not arrange | positioned in the vicinity of the corner | angular 20, the area | region which arrange | positions the screw 7 in the vicinity of the corner | angular 20 can be provided. Therefore, in the core cover 4, the screw 7 is disposed in the vicinity of the corner 20. This screw 7 is an example of a “clasp”.

  Further, the core cover 4 is disposed so that the water stop route by the waterproof packing 6 passes through the inside of the screw 7 and in the other part, through the vicinity of the side surface formed by the front cover 2. The water stop route has an annular shape surrounding the internal component 5, and the waterproof packing 6 also has an annular shape along the water stop route. The waterproof packing 6 is formed of acrylic rubber or the like. Since the internal component 5 is not disposed in the vicinity of the corner 20 where the screw 7 is disposed, the internal component 5 is protected from water intrusion even if the water stop route passes through the inside of the screw 7. This waterproof packing 6 corresponds to an example of a “waterproof member”.

  In this way, the core cover 4 and the front cover 2 are fixed by the screws 7 arranged in the vicinity of the corner 20 of the core cover 4, so that the screws are fixed in the vicinity of the corner 20 of the front cover 2. Is called.

  Here, for example, a case will be described where there are screwing points at positions away from the four corners of the front cover 2. FIG. 12 is a perspective view of the core cover in which the screwing points are arranged at positions away from the corners. Moreover, FIG. 13 is a figure for demonstrating the force concerning the tablet-type terminal device by which the screwing location is arrange | positioned in the position away from the corner.

  As shown in FIG. 12, in this case, the core cover 41 is provided with the internal component 51 up to the vicinity of the corner. Therefore, there is no area for arranging the screw 71 near the corner. Therefore, the screw 71 is provided at a position away from the corner of the core cover 41. Further, in order to prevent water from entering the internal component 51 arranged up to the vicinity of the corner, a water stop route by the waterproof packing 61 is provided so as to pass through the vicinity of the corner.

  In the tablet terminal device using the core cover 41 of FIG. 12, forces P2 and P3 as shown in FIG. 13 are applied. FIG. 13 is a diagram illustrating the force applied to the tablet terminal device in which the screw is arranged at a position away from the corner. That is, by fixing the front cover 25 and the core cover 41 with the screws 71, a force P2 that approaches the front cover 25 and the core cover 41 is applied to each of the front cover 25 and the core cover 41. By applying the force P2 at a position away from the corner, a force P3 that separates from each other is applied to each of the front cover 25 and the rear cover 31. Further, due to the repulsive force of the waterproof packing 61, a force P3 that separates the front cover 25 and the rear cover 31 from the waterproof packing 61 as a fulcrum acts more.

  In the state shown in FIG. 13, when the tablet-type terminal device falls with its corners lowered, the front cover 25 on which the touch panel 11 is mounted moves away from the rear cover 31 and the deformation amount increases. Is more likely to break.

  On the other hand, in the tablet terminal device 100 according to the present embodiment, the screw 7 is disposed in the vicinity of the corner 20 of the front cover 2. For this reason, the force which separates the front cover 2 and the rear cover 3 becomes small, and the gap between the front cover 2 and the rear cover 3 becomes small.

  Further, since the waterproof packing 6 is disposed inside the screw 7, the force that separates the front cover 2 and the rear cover 3 due to the repulsive force of the waterproof packing 6 does not work. Therefore, the deviation between the front cover 2 and the rear cover 3 can be kept small.

  In this way, by suppressing the deviation between the front cover 2 and the rear cover 3 to be small, it is possible to reduce the movement of the front cover 2 independently with respect to the rear cover 3, and to reduce the deformation amount of the front cover 2 on which the touch panel 1 is mounted. Can be suppressed. Thereby, breakage of the touch panel 1 can be suppressed.

  As described above, the tablet type terminal device according to the present embodiment places the screwing position in the vicinity of the corner, so that the screwing position of the front cover at the time of dropping is more than the state where the screwing position is away from the corner. The amount of deformation can be reduced, and damage to the touch panel can be reduced.

  Furthermore, since it is not necessary to use waterproof screws for the four corner screws, it is easy to reinforce the fitting. Furthermore, the gaps at the four corners can be reduced compared with the case where the screw is away from the corner, and the appearance can be improved.

  Next, Example 3 will be described. In the tablet-type terminal device according to the present embodiment, a rib that contacts the core cover extends from the boss of the front cover. Below, the boss | hub of the front cover in the tablet-type terminal device which concerns on a present Example is demonstrated concretely.

  FIG. 14 is a perspective view of a corner portion of the front cover according to the third embodiment. FIG. 14 shows a state where the corner 20 of the front cover 2 is viewed from the inside.

  As shown in FIG. 14, the front cover 2 according to the present embodiment has a boss 210 in the vicinity of the corner 20. The boss 210 is a boss corresponding to the screw 7 that connects the core cover 4 and the front cover 2.

  The boss 210 has a rib 211 extending on the inner wall of the front cover 2 on the side surface. The rib 211 connects the side surface of the boss 210 and the inner wall of the front cover 2. Here, in FIG. 14, four ribs 211 are provided, but the number is not particularly limited. The rib 211 is an example of a “connecting member”.

  Further, the boss 210 has a rib 212 on the side surface that extends toward the core cover 4 in a state where the front cover 2 and the core cover 4 are fitted. The rib 212 is in contact with a wall surface of the core cover 4 extending in the direction of the front cover 2 in a state where the front cover 2 and the core cover 4 are fitted. Here, in FIG. 14, five ribs 212 are provided, but the number is not particularly limited. The rib 212 is an example of a “contact member”.

  FIG. 15 is a diagram illustrating a state in which the front cover and the core cover according to the present embodiment are fitted. FIG. 15 shows a cross section at a position where both the ribs 211 and 212 are cut in a state where the front cover 2 and the core cover 4 are fitted.

  As shown in FIG. 15, the rib 212 extending from the boss 210 is in contact with the core cover 4. Specifically, the rib 212 contacts the core cover 4 in the contact areas S1 and S2. Here, in the contact region S1, the rib 212 is in contact with the wall of the water stop route where the waterproof packing 6 is disposed. Further, the rib 211 extending from the boss 210 to the inner wall of the front cover 2 also contacts the core cover 4 in the contact region S3.

  Here, when the tablet-type terminal device 100 falls with the corner 20 facing down, the touch panel 1 receives a force in a contracting direction due to the protrusion 201 hitting the ground. In that case, the deformation of the front cover 2 in the direction in which the touch panel 1 contracts is inhibited by the rib 212 coming into contact with the core cover 4 in the contact areas S1 and S2. Further, the rib 211 comes into contact with the core cover 4 in the contact region S3, thereby inhibiting the deformation of the front cover 2 in the direction in which the touch panel 1 contracts. Thereby, the amount of deformation of the touch panel 1 in the shrinking direction is suppressed, and damage to the touch panel 1 can be reduced.

  Further, for example, even when a force is applied in the direction in which the touch panel 1 is pulled, the rib 212 is in contact with the core cover 4 in the contact areas S1 and S2, thereby inhibiting the deformation of the front cover 2. . Further, the rib 211 comes into contact with the core cover 4 in the contact region S3, thereby inhibiting the deformation of the front cover 2. Thereby, the deformation amount in the direction in which the touch panel 1 is pulled can be suppressed, and damage to the touch panel 1 can be reduced.

  As described above, even when a force in either the direction in which the touch panel 1 is pulled or the direction in which the touch panel 1 is contracted is applied, deformation of the touch panel 1 can be suppressed. The effect of reducing damage can be obtained.

  Further, the rib 211 is connected to the inner wall of the front cover 2 so that the deformation amount of the front cover 2 at the time of dropping can be suppressed.

  As described above, the tablet terminal device according to the present embodiment has the rib connected to the inner wall of the front cover from the boss of the front cover and the rib connected to the core cover. Thereby, the deformation amount of the front cover at the time of dropping can be suppressed, and damage to the touch panel can be reduced.

  Furthermore, in the present embodiment, the rib 212 is extended so as to contact the wall of the water stop route, but the contacting wall is not particularly limited. For example, the core cover 4 is used for suppressing deformation extending to the front cover 2. A wall may be formed, and the rib 212 may be brought into contact with the wall for suppressing deformation.

(Modification 4)
Next, Modification 4 will be described. FIG. 16 is a perspective view of a corner portion of the tablet terminal device according to the fourth modification.

  As shown in FIG. 16, in the tablet terminal device 100 according to this modification, the touch panel 1 is arranged at a position farther from the corner 20 than in the case of the third embodiment. That is, the distance L is longer than that of the third embodiment.

  In this way, by increasing the distance from the four corners to the touch panel, the drop impact is absorbed by the deformation of the front cover, and the impact is not easily transmitted to the touch panel. Thereby, damage to the touch panel can be further reduced.

DESCRIPTION OF SYMBOLS 1 Touch panel 2 Front cover 3 Rear cover 4 Core cover 5 Internal part 6 Waterproof packing 7 Screw 20-24 angle | corner 100 Tablet type terminal device 201 Protrusion 210 Boss 211,212 Rib

Claims (5)

A display screen,
A first member having a first surface on which the screen is mounted;
A plate-like housing having an internal space and having the first surface as one surface is formed by fitting with the first member, and a second surface opposite to the first surface of the housing. A second member having
A third member fixed and arranged in the internal space with respect to the first member and the second member;
Bosses arranged in the vicinity of the four corners of the housing so as to protrude in the direction of the second member from the wall of the internal space of the first member;
A connecting member connecting the boss and the four corner side walls of the first member;
A contact member extending from the boss so as to contact the third member disposed in the internal space;
An information processing apparatus comprising: The information processing apparatus according to claim 1 , wherein the boss is a fastener receiver that fixes the first member and the second member or the third member . The projection further provided in the vicinity of the said 1st surface in the four corners of the side surface of the said housing | casing in the state which combined the said 1st member and the said 2nd member was characterized by the above-mentioned. The information processing apparatus described in 1. The information processing apparatus according to claim 3, wherein the four corners have a shape that expands from the second surface side toward an apex of the protrusion . A fastener that is disposed in the vicinity of the four corners and fixes the first member and the second member in the thickness direction;
A waterproof member in contact with the first member and having an annular path passing through the inside of the fastener and passing through the vicinity of the side surface of the housing;
The information processing apparatus according to any one of claims 1 to 4, further comprising a.

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