JP2014107714A - Portable terminal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable terminal device in which a housing is stably held at a predetermined angle.SOLUTION: A portable terminal device 1 according to the invention includes: a first housing 10; a second housing 20; a hinge 30; a recessed part 52; and a stand 51. The recessed part 52 is provided at the second housing 20. The stand 51 is provided at the first housing 10 and may support the first housing 10 and the second housing 20 so that a predetermined angle is made between a first surface 100a of the first housing 10 and a second surface 200a of the second housing 20 while being engaged with the recessed part 52.

Description

  The present invention relates to a mobile terminal device.

  In recent years, mobile terminal devices such as mobile phones and smartphones have become widespread. In particular, folding terminals are widely used in mobile phones. Further, a foldable terminal has also been proposed for smartphones.

  The mobile terminal device has various functions such as video playback and games in addition to general mobile phone functions such as a call function and a mail function. For this reason, the user selects the style (attitude) of the mobile terminal device suitable for these functions, and uses the mobile terminal device. Examples of the style of the mobile terminal device include a state in which the foldable mobile terminal device is opened (open state), a closed state (closed state), and the like.

  For example, Patent Document 1 discloses a foldable information processing apparatus. This information processing apparatus includes a retractable stand on the back surface in the open state. The user can use the information processing apparatus with the stand raised on a desk or the like.

Japanese Patent Laid-Open No. 9-305259

  At this time, depending on the function performed by the foldable portable terminal device, a style in which each casing is fixed at a predetermined angle instead of the open state and the closed state may be preferable. However, the means for holding the casing at a predetermined angle is only the hinge connecting the two casings, and the style holding force of the portable terminal device is unstable. Therefore, when an external force is applied to the mobile terminal device, there is a problem that the housing cannot maintain a predetermined angle.

  In view of the above problems, an object of the present invention is to provide a mobile terminal device that can stably hold a casing at a predetermined angle.

  A portable terminal device according to one embodiment of the present invention includes a first housing having a first surface provided with a first display portion, and a second surface provided with a second display portion. Two housings, the first housing, and the second housing are connected around a rotation axis, and the first housing and the second housing are at least in the first state. A connecting portion that connects the first surface and the second surface toward the outside, a locking portion that is provided in the second housing, and a locking portion that is provided in the first housing; The first housing and the second housing can be supported so that the angle formed by the first surface and the second surface is a predetermined angle while being locked to the stopper. A support member.

  According to the present invention, it is possible to provide a mobile terminal device that can stably hold a casing at a predetermined angle.

It is a top view of the portable terminal device of a closed state concerning an embodiment. It is a rear view of the portable terminal device of a closed state concerning an embodiment. It is a top view of the portable terminal device of a closed state concerning an embodiment. It is a bottom view of the portable terminal device of a closed state concerning an embodiment. It is a side view of the portable terminal device of a closed state concerning an embodiment. It is a side view of the portable terminal device of a closed state concerning an embodiment. It is a top view of the portable terminal device of the open state concerning embodiment. It is a rear view of the open portable terminal device concerning an embodiment. It is AA sectional drawing of FIG. 8 at the time of stand accommodation. It is AA sectional drawing of FIG. 8 at the time of stand protrusion. It is a perspective view for demonstrating the usage condition concerning embodiment. It is a perspective view for demonstrating the usage condition concerning embodiment. It is a perspective view for demonstrating the usage condition concerning a modification.

Embodiments of the present invention will be described below with reference to the drawings.
1-6 is a figure which shows the closed state of the portable terminal device 1. FIG. FIG. 1 is a front view of the portable terminal device 1 according to the present embodiment in a closed state. FIG. 2 is a rear view of the mobile terminal device 1 in the closed state. FIG. 3 is a top view of the mobile terminal device 1 in the closed state. FIG. 4 is a bottom view of the mobile terminal device 1 in the closed state. 5 and 6 are side views of the mobile terminal device 1 in the closed state.

  7 and 8 are diagrams showing an open state of the mobile terminal device 1. FIG. FIG. 7 is a front view of the mobile terminal device 1 according to the present embodiment in the open state. FIG. 8 is a rear view of the mobile terminal device 1 in the open state. In addition, the portable terminal device 1 concerning this Embodiment is a smart phone, a tablet-type portable terminal device, a mobile phone, a game machine, an electronic book terminal etc., for example.

<Configuration of mobile terminal device 1>
First, the configuration of the mobile terminal device 1 will be described with reference to FIGS. The mobile terminal device 1 according to the present embodiment includes a first housing 10 and a second housing 20. The mobile terminal device 1 includes a hinge 30 between the first housing 10 and the second housing 20 (see, for example, FIGS. 1 and 8).

  The hinge 30 (connector) connects the first housing 10 and the second housing 20 so as to be openable and closable. More specifically, the hinge 30 connects the first housing 10 and the second housing 20 so as to be openable and closable around the rotation axis. In other words, the hinge 30 is changed from the closed state (first state) to the open state (second state) or from the open state (second state) to the closed state (first state). The first casing 10 and the second casing 20 are coupled so that the position can be changed. In the closed state, the first casing 10 and the second casing 20 overlap in the thickness direction of the casing (see FIGS. 1 and 2).

  Further, the hinge 30 connects the main surface 100a (first surface) of the first housing 10 and the main surface 200a (second surface) of the second housing 20 to the outside in the closed state. (See FIGS. 1 and 2). In other words, the hinge 30 connects the first housing 10 and the second housing 20 so that the main surface 100a and the main surface 200a face in opposite directions in the closed state. Further, the hinge 30 relatively rotates the first housing 10 and the second housing 20 around the rotation axis from the closed state (first state) to the open state (second state). The hinge 30 holds the first and second casings 10 and 20 in the closed state, and holds the first and second casings 10 and 20 in the opened state.

  The main surface 100a (first surface) of the first housing 10 is substantially rectangular. More specifically, the main surface 100 a is a rectangle having a long side in the direction of the rotation axis of the hinge 30. The main surface 100a is a plane that faces the outside of the mobile terminal device 1 in the closed state.

  The 1st housing | casing 10 is provided with the display part 11, the speaker 12, and the proximity sensor 13 on the main surface 100a (refer FIG. 1). The display unit 11 (first display unit) is, for example, an LCD (Liquid Crystal Display), and displays an image in accordance with control of a sub board (not shown) stored in the first housing 10. Of course, the display unit 11 is not limited to the LCD, and may be another display device (organic EL (Electro Luminescence) or the like). The display unit 11 has a substantially rectangular shape and is positioned at the approximate center of the main surface 100a. The display unit 11 may include an operation unit such as a touch panel (not shown).

  The receiver 12 outputs the other party's voice during a call. The first housing 10 includes a receiver 12 at the longitudinal end of the main surface 100a. That is, the first housing 10 includes the receiver 12 on the upper side (end side) than the display unit 11. Note that the receiver 12 is located at the approximate center of the first casing 10 in the short-side direction.

  The proximity sensor 13 is a sensor that detects that an object (such as a user's face) has approached the main surface 100a (display unit 11). The first housing 10 includes a proximity sensor 13 on the main surface 100a. The proximity sensor 13 is located closer to the hinge 30 than the receiver 12.

  The second housing 20 includes a display unit 21, a camera 22, a light 23, a main microphone 24, a sub microphone 25, a USB (Universal Serial Bus) connector 26, an earphone jack 27, a side key 28, And an antenna 29 (see FIGS. 2 to 5). Further, the second housing 20 has a main board and a battery (not shown). The main board has circuit elements. Here, the circuit element (control means) is, for example, an integrated circuit device such as a processor, a memory, or a communication module for driving the mobile terminal device 1, a display control circuit, or the like. The battery supplies power to the main board and the display units 11 and 21. The battery is, for example, a lithium ion secondary battery.

  The main surface 200a of the second housing 20 is substantially rectangular. More specifically, the main surface 200 a is a rectangle having a long side in the direction of the rotation axis of the hinge 30. The main surface 200a (second surface) is a plane that faces the outside of the mobile terminal device 1 in the closed state.

  The display unit 21 (second display unit) is, for example, an LCD, and displays an image in accordance with control of a main board (not shown) stored in the second housing 20. Of course, the display unit 21 is not limited to the LCD, and may be another display device (organic EL or the like). The display unit 21 has a substantially rectangular shape and is located at the approximate center of the main surface 200a. The display unit 21 may include an operation unit such as a touch panel (not shown).

  The camera 22 has an image sensor (not shown). The camera 22 executes an imaging process according to a user operation, and generates image data and moving image data. The camera 22 is positioned above the display unit 21 (on the end side in the longitudinal direction of the second housing 20).

  The light 23 emits light according to flash photography of the camera 22 or the like. The light 23 is located in the vicinity of the camera 22.

  The main microphone 24 is a microphone device that collects ambient sounds. Specifically, the main microphone 24 picks up a user's voice during a call, surrounding sounds during moving image shooting, and the like. The main microphone 24 is located on the side surface on the lower side (longitudinal end side) of the second housing 20 (see FIG. 4).

  The sub microphone 25 is a microphone device that collects ambient sounds. Specifically, the sub microphone 25 collects a user's voice during a call (hands-free call), surrounding sounds during moving image shooting, and the like. The sub microphone 25 is located on the upper side surface of the second housing 20 (see FIG. 3). More specifically, the sub microphone 25 is located on the side surface opposite to the side surface on which the main microphone 24 is provided.

  The USB connector 26 is a connector for connecting to an external device (memory, PC (Personal Computer), charger, etc.). The USB connector 26 is located on the upper surface of the second housing 20 (see FIG. 3).

  The earphone jack 27 is a terminal for connecting to an earphone or a headphone. The side key 28 is a key used for volume adjustment or the like. The earphone jack 27 and the side key 28 are located on the side surface of the second housing 20 opposite to the side surface to which the hinge 30 is connected (see FIG. 5).

  The antenna 29 transmits and receives radio waves used for communication functions (call, mail, Internet, etc.) of the mobile terminal device 1. The antenna 29 receives radio waves used for one-segment broadcasting. The second housing 20 accommodates the antenna 29 at both ends in the longitudinal direction (see FIG. 2).

  The mobile terminal device 1 includes a 6-axis sensor 41 and an open / close detection sensor 42 (see FIG. 8). The 6-axis sensor 41 (attitude detection means) is provided inside the first housing 10. The six-axis sensor 41 includes an acceleration sensor that detects the three directions of up and down, left and right, and front and rear. The 6-axis sensor 41 detects the attitude, movement direction, orientation, and rotation of the mobile terminal device 1. The open / close detection sensor 42 (posture detection means) detects whether the mobile terminal device 1 is in an open state or a closed state. The open / close detection sensor 42 may be configured using, for example, a mechanical switch or the like, or may be configured using a Hall element and a magnet.

  Furthermore, the mobile terminal device 1 includes a stand 51 and a recess 52. The stand 51 (support member) is a rod-like member extending in the short direction of the first housing 10. The stand 51 is provided on the back surface (the surface opposite to the main surface 100a, the third surface) of the first housing 10. The stand 51 is located closer to the end of the first housing 10 than the display unit 11 in the longitudinal direction of the first housing 10. That is, the stand 51 does not overlap the display unit 11 in a plan view of the first housing 10 (see FIG. 1). Thereby, it can avoid that components overlap in the thickness direction of the first casing 10. As a result, the mobile terminal device 1 can reduce the thickness of the first housing 10.

  The recess 52 (locking portion) is provided on the back surface (the surface opposite to the main surface 200a, the fourth surface) of the second housing 20. When the end of the stand 51 is fitted into the recess 52, the stand 51 is locked.

  In addition, a switch 521 for detecting that the stand 51 is locked is provided in the recess 52. That is, the switch 521 (support detection means) detects that the stand 51 is locked by being pushed by the end of the stand 51 fitted in the recess 52. In other words, the switch 521 detects that the stand 51 supports the first housing 10 and the second housing 20 by detecting that the stand 51 is locked. The main board acquires the detection result of the switch 521.

  Here, a detailed configuration of the stand 51 will be described with reference to FIGS. 9 and 10. 9 and 10 are AA cross-sectional views of FIG. FIG. 9 shows a state where the stand 51 is stored. FIG. 10 shows a state where the stand 51 protrudes. As shown in FIGS. 9 and 10, one end of the stand 51 is connected to the connecting portion 53 of the first housing 10 so as to be displaceable. Specifically, the stand 51 is configured to be rotatable about a rotation axis of a connecting portion 53 (for example, a hinge).

  The first housing 10 has a storage portion 54 on the back surface 100b side. The storage unit 54 is a space in which the stand 51 can be stored. Similar to the stand 51, the storage portion 54 does not overlap the display portion 11 in a plan view of the first housing. Thereby, the mobile terminal device 1 can reduce the thickness of the first housing 10.

  As shown in FIG. 9, when the stand 51 is stored, the side surface 511 of the stand 51 (the side surface on the back side of the first housing 10) and the back surface 100 b of the first housing 10 are substantially omitted. Form the same plane. That is, in the closed state of the mobile terminal device 1, the side surface of the stand 51 constitutes a part of the back surface 100 b of the first housing 10. Thereby, in the closed state of the portable terminal device 1, the back surface 100b of the 1st housing | casing 10 can contact | connect the back surface of the 2nd housing | casing 20 without gap, and can achieve thickness reduction.

  In the state where the stand 51 protrudes from the storage portion 54, the end portion 55 of the stand 51 is exposed (see FIG. 10). When the end portion 55 of the stand 51 is fitted into the recess 52 of the second housing 20, the stand 51 is locked. Note that the end 51 on the hinge 30 side of the stand 51 can be exposed, and the end on the side opposite to the hinge 30 is connected to the first housing 10 via the connecting portion 53.

  The support detection means is not limited to a physical switch. For example, the support detection unit may detect that the stand 51 is locked to the recess 52 using a magnetic sensor or an optical sensor. Further, a support detection unit that detects that the stand 51 has been removed from the storage unit 54 may be provided in the storage unit 54. That is, the support detection unit detects that the stand 51 is supporting the first housing 10 and the second housing 20 by detecting that the stand 51 has been taken out.

<Usage aspect of the portable terminal device 1>
Then, the usage mode of the portable terminal device 1 concerning this Embodiment is demonstrated with reference to FIG.11 and FIG.12. FIG. 11 is an external perspective view showing a first usage mode of the mobile terminal device 1. FIG. 12 is an external perspective view showing a second usage mode of the mobile terminal device 1.

  In the usage mode shown in FIG. 11 and FIG. 12, the first 51 is set so that the angle θ between the main surface 100a and the main surface 200a becomes a predetermined angle in a state where the stand 51 is locked to the recess 52. The housing 10 and the second housing 20 are supported. Thereby, the first housing 10 and the second housing 20 are fixed in a state where the angle θ formed by the main surface 100a and the main surface 200a is maintained at a predetermined angle.

  The first usage mode illustrated in FIG. 11 is a usage mode used when, for example, a user views a moving image or the like alone. Specifically, the main surface 200a of the second housing 20 is placed on a placement surface (not shown). Thereby, in the 1st use mode, display part 11 of the 1st case 10 will be in the state where the angle theta inclined to the principal surface 200a (or mounting surface) of the 2nd case 20. Therefore, the user can view a moving image or the like by placing the mobile terminal device 1 on a desk or the like.

  For example, when the user places the mobile terminal device 1 on a desk or the like and views a moving image, the desk or the like that is the placement surface is considered to be located below the user's line of sight. Therefore, it is preferable that the display unit 11 is inclined toward the upper side (the direction in which the placement surface is directed; the upper side in FIG. 11). That is, it is preferable that the angle θ formed by the main surface 100a and the main surface 200a is an acute angle.

  The second usage mode illustrated in FIG. 12 is a usage mode used when, for example, two users face each other and view a moving image or the like. Specifically, the side surface opposite to the hinge 30 of the first housing 10 and the side surface opposite to the hinge 30 of the second housing 20 are placed on a placement surface (not shown). . Thereby, one user can see the display unit 11 of the first housing 10, and the other user can see the display unit 21 of the second housing 20.

  At this time, the control unit of the main board switches the function executed by the mobile terminal device 1 based on the detection result of the switch 521. For example, when it is detected by the switch 521 that the stand 51 is locked in the recess 52, the control unit executes the moving image playback function from the standby state. Note that when the switch 521 detects that the stand 51 is locked in the recess 52, the function executed by the control unit is not limited to moving image reproduction, and may be set as appropriate by the user. Thereby, the portable terminal device 1 can automatically execute the moving image playback function when the usage mode of FIG.

  However, only the detection result of the switch 521 cannot determine whether the mobile terminal device 1 is in the state of FIG. 11 or FIG. Therefore, the control unit acquires the detection result of the 6-axis sensor 41 in addition to the detection result of the switch 521. That is, a control part acquires the attitude | position of a portable terminal device. Thereby, the control part can judge whether the portable terminal device 1 is the attitude | position of the usage mode of FIG. 11 (1st usage mode) or FIG. 12 (2nd usage mode).

  Further, the control unit may switch the function executed by the mobile terminal device 1 based on the detection result of the switch 521 and the detection result of the 6-axis sensor 41. For example, when the control unit determines that the first usage mode illustrated in FIG. 11 is based on the detection result of the switch 521 and the detection result of the six-axis sensor 41, the display unit 21 of the second housing 20. May be turned off and the display unit 11 of the first housing 10 may be turned on. At this time, the control unit displays the display unit so that the end on the hinge 30 side is the lower side of the video and the end opposite to the hinge 30 is the upper side of the video in the short direction of the first housing 10. 11 may be controlled.

  For example, when the control unit determines that the second usage mode illustrated in FIG. 12 is based on the detection result of the switch 521 and the detection result of the 6-axis sensor 41, the display units 11 and 21 are turned on. It is good. At this time, in the short direction of the first housing 10, the control unit displays the display unit so that the end on the hinge 30 side is the upper side of the moving image and the end opposite to the hinge 30 is the lower side of the moving image. 11 may be controlled. Similarly, the control unit may control the display unit 21 so that the end on the hinge 30 side is on the upper side of the moving image and the end on the opposite side of the hinge 30 is on the lower side of the moving image.

  As described above, the control unit uses the detection result of the six-axis sensor 41 in addition to the detection result of the switch 521 to determine the usage mode. Thereby, the control unit can determine not only the relative positional relationship between the first housing 10 and the second housing 20 but also the difference in posture with respect to the placement surface of the mobile terminal device 1. Therefore, the control unit can execute a function suitable for each posture, and can improve the convenience of the mobile terminal device.

  As described above, according to the configuration of the mobile terminal device 1 according to the present embodiment, the first housing 10 has the stand 51. Further, the second housing 20 has a recess 52. The stand 51 is locked to the recess 52, and the first casing 10 and the second casing 20 are set so that the angle θ formed by the main surface 100a and the main surface 200a is a predetermined angle. Can be supported. Therefore, the mobile terminal device 1 can stably hold the housing at a predetermined angle.

<Modification>
A modification according to the present embodiment will be described. FIG. 13 shows an external perspective view of the first usage mode of the mobile terminal device according to the modification. The mobile terminal device according to the modification has three recesses 52a to 52c. Since other configurations are the same as those of the mobile terminal device 1 described above, description thereof will be omitted as appropriate.

  The recesses 52 a to 52 c are configured to be able to fit with the stand 51. The recesses 52 a to 52 c are engaged with the stand 51 to lock the stand 51. Each of the recesses 52a to 52c has a switch.

  The recesses 52 a to 52 c are provided at different positions on the back surface of the second housing 20. More specifically, the recesses 52 a to 52 c are provided at the end in the longitudinal direction of the second housing 20. Further, the recesses 52 a to 52 c are arranged in the short direction of the second housing 20. Therefore, the angle θ (the angle formed between the main surface 100a and the main surface 200a) in the state where the stand 51 is locked in the recess 52a, the state where the stand 51 is locked in the recess 52b, and the state where the stand 51 is locked in the recess 52c, respectively. ) Is different. That is, the stand 51 can support the first housing 10 and the second housing 20 by changing the angle formed by the main surface 100a and the main surface 200a. Therefore, the mobile terminal device according to the modification can fix the first housing 10 and the second housing 20 at a plurality of different angles θ.

  A control part acquires the detection result of the switch provided in each recessed part 52a-52c. For example, in the state shown in FIG. 13, the stand 51 is fitted in the recess 52a. Therefore, the switch in the recess 52a is pushed. And a control part acquires the detection result of the switch of recessed part 52a-52c. That is, the control unit acquires information that the switch of the recess 52a is turned on (pressed), the switch of the recess 52b is turned off, and the switch of the recess 52c is turned off. Thereby, the control part can recognize angle (theta) which the main surface 100a and the main surface 200a make. In addition, the switch does not need to be provided in all the recessed parts 52a-52c.

  And a control part switches the function which a portable terminal device performs based on angle (theta) which the main surface 100a and the main surface 200a make. That is, the control unit switches the function to be executed by the mobile terminal device based on the position of the switch pushed by the stand 51 (the position of the recess that fits with the stand 51).

  As described above, according to the configuration of the mobile terminal device according to the modification, the second housing 20 has the three recesses 52a to 52c. Thereby, the user can fix the mobile terminal device in three postures in the first usage mode (FIGS. 11 and 13). Similarly, in the second usage mode (FIG. 12), the user can fix the mobile terminal device in three postures. As a result, the fixable posture of the mobile terminal device can be increased. Therefore, the user can select the attitude of the mobile terminal device suitable for the use situation, and the convenience of the mobile terminal device can be improved.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the configuration of the above embodiment, and can be made by those skilled in the art within the scope of the invention of the claims of the claims of the present application. It goes without saying that various modifications, corrections, and combinations are included.

  For example, the shape of the stand 51 is not limited to the shape shown in FIGS. The stand 51 may have a flat plate shape instead of a rod shape. Further, the shape and position of the recess 52 are not limited to the positions shown in FIGS. When the 2nd housing | casing 20 has a some recessed part, the number of recessed parts is not restricted to three pieces. Furthermore, the stand 51 may be connected to the second housing 20 and the first housing 10 may have a recess. Moreover, the shape of the latching | locking part which latches the stand 51 is not restricted to a recessed part, A convex part and a through-hole may be sufficient.

DESCRIPTION OF SYMBOLS 1 Portable terminal device 10 1st housing | casing 11 Display part 12 Receiver 13 Proximity sensor 20 2nd housing | casing 21 Display part 22 Camera 23 Light 24 Main microphone 25 Sub microphone 26 USB connector 27 Earphone jack 28 Side key 30 Hinge 41 6 axis Sensor 42 Opening / closing detection sensor 51 Stand 52 Recessed portion 53 Connection portion 54 Storage portion 100a, 200a Main surface 100b Rear surface

Claims (12)

A first housing having a first surface provided with a first display;
A second housing having a second surface provided with a second display portion;
The first housing and the second housing are coupled around a rotation axis, and the first surface and the second housing are in the first state at least in the first state and the second housing. A connecting portion for connecting the second surface and the second surface, respectively,
A locking portion provided in the second housing;
The first housing is provided in the first casing and is locked to the locking portion so that an angle formed by the first surface and the second surface is a predetermined angle. A support member capable of supporting the housing and the second housing;
A mobile terminal device comprising:   The portable terminal device according to claim 1, further comprising a support detection unit that detects a state in which the support member supports the first casing and the second casing. One end of the support member is coupled to the first housing on a third surface opposite to the first surface,
The other end of the support member is provided on a fourth surface opposite to the second surface in a state where the support member supports the first housing and the second housing. The portable terminal device according to claim 2, which is locked to the locking portion.   The portable terminal device according to claim 3, wherein the second casing accommodates a substrate and a battery. The support member is connected to the first housing so as to be relatively displaceable,
5. The mobile terminal device according to claim 3, wherein the first housing has a storage portion capable of storing the support member on the third surface. 6.   The portable terminal device according to claim 5, wherein the first display unit and the storage unit do not overlap in a plan view of the first housing.   The portable terminal device according to claim 5, wherein the support detection unit is provided in the storage unit and detects that the support member has been removed from the storage unit.   The portable terminal device according to any one of claims 2 to 6, wherein the support detection unit detects a state in which the locking portion locks the support member.   The mobile terminal device according to claim 7, further comprising a control unit that switches a function executed by the mobile terminal device based on a detection result of the support detection unit. Further comprising posture detection means for detecting the posture of the mobile terminal device;
The portable terminal device according to claim 9, wherein the control unit switches a function executed by the portable terminal device based on a detection result of the support detection unit and a detection result of the posture detection unit. The mobile terminal device includes a plurality of the locking portions,
The plurality of locking portions are arranged at different positions,
The portable terminal device according to claim 9 or 10, wherein the control unit switches a function executed by the portable terminal device based on a position of the locking portion that locks the support member.   The mobile terminal apparatus according to claim 1, wherein the predetermined angle is an acute angle.

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