Hinge mechanism capable of maintaining any angle and preventing over-bending and folding display device

Abstract

The present invention discloses a hinge mechanism that can maintain any angle and prevent over-bending, belonging to the technical field of flexible display devices. It includes a hinge fixing member, at least one end of the hinge fixing member is provided with a rotation module. The rotation module includes at least one rotation shaft. One end of the rotation shaft is connected to a hinge frame, and the hinge frame is equipped with an anti-over-bending component for limiting its rotation angle. The other end is provided with a first cam that rotates synchronously with it. It also includes a second cam slidably arranged on the rotation shaft. The second cam is equipped with an elastic member that drives it to contact and engage with the first cam, so as to achieve the function of opening the fuselage to any angle and maintaining the current angle state. At the same time, it has the function of preventing over-bending to prevent the flexible screen from warping and creasing after long-term use.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible display devices. Specifically, it relates to a hinge mechanism and a folding display device that can maintain any angle and prevent excessive bending. Background Art

[0002] With the rapid development of flexible display technology, to meet the needs of the current smartphone market, various related products of flexible folding display devices have been successively launched. Through the design of the core hinge mechanism, a foldable flexible screen is mounted on the hinge. For the design of the hinge, it directly relates to the success or failure of the folding product, including the operating feeling and durability of product bending, etc., and directly affects the user experience.

[0003] Currently, the designs and user experiences of folding devices vary. From the existing folding devices on the market, it can be found that currently, most products cannot stop the body at any angle during the bending process. If the user cannot maintain the body at any required angle during use, it will be a great pity for the user experience and also a potential inevitable demand.

[0004] In addition, for hinge products of the outward folding type, when the body is opened from the closed state to fully open, not only a hinge mechanism that can keep flat at 180° is required, but also a hinge mechanism that can prevent the flexible folding device from rotating more than 180°. When the body exceeds 180° after being flattened, a pulling force will be generated on the flexible screen. After the flexible device undergoes long-term opening and closing operations, it will cause the problem of elongation of the flexible panel it carries, further leading to appearance problems such as warping and creases similar to those of current outward folding products on the market. Even more seriously, it will directly affect the service life of the entire flexible device.

[0005] Therefore, whether from the perspective of flexible panel manufacturers or the user experience, the design of being able to maintain any angle and prevent excessive bending is an essential function. Summary of the Invention

[0006] In view of this, to solve the above problems existing in the prior art, the purpose of the present invention is to provide a hinge mechanism and a folding display device that can maintain any angle and prevent excessive bending, so as to achieve the body being opened to any angle and maintaining the current angle state. At the same time, it has the function of preventing excessive bending to prevent warping and creasing of the flexible screen after long-term use.

[0007] The technical solution adopted by the present invention is as follows: A hinge mechanism that can maintain any angle and prevent overbending, including a hinge fixing member, at least one end of the hinge fixing member is provided with a rotation module, the rotation module includes at least one rotation shaft, one end of the rotation shaft is connected to a hinge frame and the hinge frame is provided with an anti-overbending component for limiting its rotation angle, and the other end is provided with a first cam that rotates synchronously with it; it also includes a second cam slidably disposed on the rotation shaft, and the second cam is provided with an elastic member for driving it to contact and engage with the first cam.

[0008] Further, the rotation module further includes a module housing installed on the hinge fixing member, a gear support member is installed in the module housing, the hinge frame is rotatably provided in the gear support member, and one end of the hinge frame is assembled with the rotation shaft to achieve stable assembly of the rotation shaft and the hinge frame.

[0009] Further, the anti-overbending component includes a limiting boss provided on the gear support member and a rotating boss provided on the hinge frame, the limiting boss is located on the rotation movement track of the rotating boss, so as to limit the movement of the rotating boss through the limiting boss, and further, the anti-overbending function of the hinge mechanism is realized.

[0010] Further, the hinge fixing member is set as a symmetric body, and the hinge fixing member includes a fixing member base and a fixing member cover plate, the fixing member cover plate is installed on the fixing member base and an inner cavity is formed between the two, and the rotation module is installed in the inner cavity.

[0011] Further, the anti-overbending component includes a limiting block provided on the hinge frame, and the limiting block is limited by the fixing member cover plate, and further, the anti-overbending function of the hinge mechanism is realized.

[0012] Further, the hinge frames are symmetrically arranged on both sides of the end of the hinge fixing member, and the two hinge frames on both sides of the same end are driven by the rotation module to perform synchronous linkage movement to realize the synchronous movement of the hinge frames on both sides.

[0013] Further, the first cam includes a gear portion and an A cam portion; the rotation module includes two symmetrically arranged rotation shafts, a first cam is provided on each rotation shaft and the gear portions of the first cams are meshed and driven, and the rotation shafts are driven to perform synchronous linkage movement through the first cam. The structural design of the first cam can not only meet the synchronous movement of the hinge frame, but also cooperate with the second cam to realize the function of stopping at any angle.

[0014] Further, the second cam is simultaneously sleeved on the two rotation shafts, and one end of the second cam is provided with a B cam portion corresponding to and matching the A cam portion to realize the function of stopping the hinge frame at any angle.

[0015] Further, the elastic member is a spring. The spring is sleeved on the rotating shaft, one end of the spring abuts against the second cam, and the other end abuts against the module housing, so as to provide sufficient elastic force for the second cam and make it abut tightly against the first cam.

[0016] In the present invention, a folding display device is further provided, including an upper housing and a lower housing arranged symmetrically. The upper housing and the lower housing are driven to move by the hinge mechanism capable of maintaining any angle and preventing overbending as described in any one of the above.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. By adopting the hinge mechanism and the folding display device capable of maintaining any angle and preventing overbending provided by the present invention, through the arrangement of the first cam and the second cam on the rotating shaft, under the action of the elastic member, when opening or closing the folding display device through this hinge mechanism, it can be maintained at any angle, which can greatly meet the user's sense of use and sense of technology. At the same time, since the movement of the hinge frame is limited by the anti-overbending component, the pulling force on the flexible screen caused by the opening and closing of the fuselage can be well avoided, thereby well protecting the flexible screen. The folding display device adopting this technical solution can meet the market demand, thus realizing the differential advantage of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the overall structural schematic diagram of the hinge mechanism capable of maintaining any angle and preventing overbending provided by the invention;

[0020] Figure 2 is the internal structural schematic diagram of the hinge mechanism capable of maintaining any angle and preventing overbending provided by the invention;

[0021] Figure 3 is the internal structural schematic diagram of the rotating module in the hinge mechanism capable of maintaining any angle and preventing overbending provided by the invention;

[0022] Figure 4 is the structural schematic diagram of the gear support in the hinge mechanism capable of maintaining any angle and preventing overbending provided by the invention;

[0023] Figure 5 is the structural schematic diagram of the first cam in the hinge mechanism capable of maintaining any angle and preventing overbending provided by the invention;

[0024] Figure 6 is the structural schematic diagram of the second cam in the hinge mechanism capable of maintaining any angle and preventing overbending provided by the invention;

[0025] Figure 7 is the anti-overbending structural schematic diagram of the hinge mechanism capable of maintaining any angle and preventing overbending provided by the invention in Embodiment 1;

[0026] Figure 8 Figure 1 is a schematic structural view of the hinge bracket in Embodiment 1 of the hinge mechanism provided by the invention, which can maintain any angle and prevent over-bending;

[0027] Figure 9 Figure 2 is a schematic structural view of the anti-over-bending in Embodiment 2 of the hinge mechanism provided by the invention, which can maintain any angle and prevent over-bending;

[0028] Figure 10 Figure 3 is a schematic overall structural view of the folding display device provided by the invention;

[0029] The labels in the drawings are as follows:

[0030] 1 - fixing part cover plate, 2 - hinge bracket, 3 - fixing part base, 4 - module housing, 5 - snap ring, 6 - gear support, 7 - first cam, 8 - second cam, 9 - spring, 10 - limiting boss, 11 - A inclined plane, 12 - A plane, 13 - B inclined plane, 14 - B plane, 15 - rotating boss, 16 - limiting block, 17 - upper outer shell, 18 - lower outer shell, 19 - hinge outer shell. Detailed Description of the Invention

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0033] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0034] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] In the description of the embodiments of the present invention, it should be noted that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art, or the orientation or positional relationship in which the product of the invention is usually placed during use. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0036] In the description of the embodiments of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances; the drawings in the embodiments are used to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Embodiment 1

[0038] In the old-fashioned folding hinge mechanism, due to the lack of closing torque or being relatively fragile itself, in order to prevent it from opening due to its own weight, magnets are usually attached to keep it closed. In the hinge mechanism of this embodiment, when the upper and lower housings 18 are opened / closed, high torque can be provided. In the overall design, a combination of a cam and an elastic member with better durability is adopted. The specific structural design is as follows:

[0039] As Figure 1 , Figure 2 shown, it includes a hinge fixing member, and taking the hinge fixing member as a reference, the hinge fixing member is set as a symmetric body with its midline as the symmetric midline. The hinge fixing member includes a fixing member base 3 and a fixing member cover plate 1. The fixing member cover plate 1 matches the fixing member base 3, and the fixing member cover plate 1 is installed on the fixing member base 3 through a plurality of screws to form an inner cavity between the two. A rotating module is installed in this inner cavity, and the rotating module is the core component for the normal operation of this hinge mechanism.

[0040] Rotating modules are respectively arranged at both ends of the hinge fixing member, and hinge brackets 2 are symmetrically arranged on both sides of each end of the hinge fixing member. The hinge brackets 2 located on both sides of the same end are driven by the rotating module at this end to perform synchronous linkage movement. The following specifically elaborates on the internal structural design of the rotating module:

[0041] As Figure 3 shown, in order to achieve a firm assembly between the rotating module and the hinge fixing member, the rotating module includes a module housing 4 mounted on the hinge fixing member, and the module housing 4 is mounted on the fixing member base 3 by screws. A gear support 6 is installed in the module housing 4, and the hinge bracket 2 is rotatably provided in the gear support 6, and one end of the hinge bracket 2 is assembled with the rotating shaft, and the rotation of the rotating shaft is used to drive the rotation of the hinge bracket 2.

[0042] Since in this embodiment, two symmetrically arranged hinge brackets 2 are provided on both sides of the end of the hinge fixing member, both of the two hinge brackets 2 are rotatably provided on the gear support 6, and one end of each hinge bracket 2 is connected with a rotating shaft. Preferably, a bushing section is provided at the end of the hinge bracket 2, one end of the rotating shaft is sleeved inside the bushing section, and the other end is rotatably provided at the bottom of the module housing 4 and locked by a snap ring 5 to achieve synchronous rotation of the hinge bracket 2 and the rotating shaft.

[0043] As Figure 5 、 Figure 6 shown, first cams 7 that rotate synchronously with the two rotating shafts are respectively provided on the two rotating shafts. Preferably, a flat-round shaft section is provided on the rotating shaft, and the first cam 7 is sleeved on the shaft section to ensure that the first cam 7 can move synchronously with the rotating shaft. Among them, the first cam 7 includes a gear portion and an A cam portion, the A cam portion is provided at the end of the gear portion, and the A cam portion includes an A cam profile, and the A cam profile is composed of an A plane 12 and an A inclined surface 11. Since the two rotating shafts are also symmetrically arranged, and their symmetry center lines coincide with the symmetry center line of the hinge fixing member, after the first cams 7 are respectively assembled on the two rotating shafts, the gear portions of the two first cams 7 are meshed with each other, and during the rotation of the hinge bracket 2, through the linkage of the gear portions of the first cams 7, the parameters of the gear portions on the two first cams 7 are the same, so as to achieve synchronous linkage movement of each rotating shaft under the meshing and driving action of the first cams 7, and further, the hinge brackets 2 on both sides of the same end of the hinge fixing member also perform synchronous linkage movement.

[0044] In practical applications, as Figure 3 shown, the type of the elastic member adopts elements with good elasticity such as a spring 9 and an elastic gasket. One of the functions of the elastic member is to prevent the shaking caused by its own dead weight when the first cam 7 and the second cam 8 move relative to each other. In this embodiment, the elastic member is set as the spring 9, the spring 9 is sleeved on the rotating shaft, one end of the spring 9 abuts against the second cam 8, and the other end abuts against the inner bottom surface of the module housing 4. The load of the spring 9 is adjusted according to the required torque, and the load of the spring 9 adopted this time is 3.5 KG.

[0045] To enable the hinge mechanism to maintain at any opening and closing angle during the opening and closing process, components such as the first cam 7, the second cam 8, and the spring 9 are mainly used to achieve stopping at any angle. The first cam 7 is provided with an inclined surface and a flat surface, and the second cam 8 is also provided with a corresponding structure. The purpose is to jointly complete the function of arbitrary stopping with the elastic force of the spring 9. The specific design is as follows:

[0046] It also includes a second cam 8 slidably disposed on the rotating shaft. The second cam 8 is simultaneously sleeved on the two rotating shafts. The second cam 8 can only slide along its axis relative to the rotating shaft and cannot rotate relative to each other. The second cam 8 is provided with an elastic member for driving it to contact and engage with the first cam 7. The elastic member provides a pressing force for the second cam 8, and one end of the second cam 8 is provided with a B cam portion corresponding to and matching the A cam portion. Among them, the B cam portion includes a B cam profile, and the cam profile is composed of a B plane 14 and a B inclined surface 13.

[0047] In order to enable users to have a better sense of use, the opening and closing movement of the hinge mechanism in this embodiment can be maintained at any angle. In this design, the hinge mechanism can automatically close at 0° - 30° and 150° - 180°, and can stop at any angle between 30° - 150°. The specific working process is as follows:

[0048] (1) When it is between 0° - 30°, the first cam 7 rotates. It will rotate along the B inclined surface 13 in the B cam profile. During the rotation, the spring 9 is continuously compressed. When the A plane 12 of the first cam 7 cooperates with the B plane 14 of the second cam 8, the elastic force of the spring 9 reaches a certain value, and the hinge mechanism stops automatically opening. At this time, it can be opened to 30°, and at this time, the spring 9 will have the first displacement and the load increases;

[0049] (2) When it is between 30° - 150°, the first cam 7 and the second cam 8 cooperate and move along their A planes 12 and B planes 14. Since the spring 9 is always compressed at this time and has a certain elastic force, the spring 9 will maintain the first displacement and the load. During the movement, due to the elastic force of the spring 9 being transmitted to the second cam 8, sufficient frictional force is generated between the B plane 14 of the second cam 8 and the A plane 12 of the first cam 7 when the first cam 7 rotates, so that the hinge mechanism can stop at any angle. At this time, the generated torque is transmitted by the folding connecting member, so when the whole machine rotates, the required torque can be formed;

[0050] (3) When it is between 150° - 180°, the spring 9 has the second displacement and the load decreases. At this time, the spring 9 is slowly releasing its elastic force. At this time, the first cam 7 and the second cam 8 make a relative rotational movement in the inclined surface state. At this time, the hinge mechanism can automatically open until the whole device is automatically opened to 180°.

[0051] For a folding device, in order to prevent the user from exerting excessive force or the device from being overbent beyond 180° when opened to 180° due to the weight of the components of the device itself, and overbending will cause the screen to be subjected to tensile force, resulting in damage to the screen. This problem needs to be considered in the design. To achieve that the hinge mechanism has a good anti-overbending function when opened to 180°, the specific design is as follows:

[0052] The hinge frame 2 is provided with an anti-overbending component for limiting its rotation angle. Through the limitation of the anti-overbending component, when the hinge mechanism is opened to 180°, it cannot continue to rotate, so as to prevent the device from being overbent. Furthermore, it can prevent the flexible screen from warping and creasing at the bent part.

[0053] As Figure 4 、 Figure 7 shown, the anti-overbending component includes a limit boss 10 provided on the gear support 6 and a rotating boss 15 provided on the hinge frame 2. The limit boss 10 is located on the rotation movement track of the rotating boss 15. In this embodiment, the limit bosses 10 are provided in the middle of the upper and lower sides of the gear support 6. The limit boss 10 itself is also a symmetric body, and its center line is parallel to the symmetric center line between the two rotating shafts. The rotating boss 15 is provided at the end where the hinge frame 2 is rotatably arranged on the gear support 6. During the rotation of the hinge frame 2, the rotating boss 15 also rotates. At the same time, the side of the limit boss 10 is located on the movement track of the rotating boss 15 to limit the rotating boss 15. Furthermore, when the two hinge frames 2 rotate 180°, the hinge frame 2 cannot continue to move, thus achieving the effect of preventing overbending.

[0054] Embodiment 2

[0055] Compared with Embodiment 1, in this embodiment, another deformation of the anti-overbending component is made, and the same technical effect of preventing overbending can also be achieved. Compared with Embodiment 1, there is no need to design the rotating boss 15 and the limit boss 10. As Figure 9 shown, the specific design is as follows:

[0056] The anti-overbending component includes a limit convex block 16 provided on the hinge frame 2. A limit convex block 16 with a thickness of 0.3 mm is designed at the end of the hinge frame 2, and the limit convex block 16 is limited by the fixing part cover plate 1.

[0057] The working principle is:

[0058] Since the fixing base 3 of the fixing member and the fixing cover plate 1 of the fixing member are fixedly connected by screws, there is a certain gap between the fixing base 3 of the fixing member and the hinge bracket 2. Since there is a limit bump 16 at the end of the hinge bracket 2, the gap between the hinge bracket 2 and the fixing base 3 is 0. Therefore, when the hinge bracket 2 moves to 180°, since the gap between the fixing base 3 and the hinge bracket 2 is 0 mm, the hinge bracket 2 cannot continue to rotate. Furthermore, it is ensured that the hinge mechanism will not be excessively bent.

[0059] Of course, this method has extremely high requirements for processing accuracy. Because when the gap between the fixing base 3 of the fixing member and the hinge bracket 2 is greater than 0, the hinge mechanism will be overbent. When there is interference between the fixing base 3 of the fixing member and the hinge bracket 2, it will cause the fixing cover plate 1 or the fixing base 3 of the fixing member to arch. Therefore, the processing requirements are extremely high.

[0060] As Figure 10 shown, in this embodiment, a folding display device is further provided, including an upper housing 17 and a lower housing 18 arranged symmetrically. The upper housing 17 and the lower housing 18 are driven by the hinge mechanism that can maintain any angle and prevent overbending in the above-mentioned Embodiment 1 or Embodiment 2 to perform synchronous linkage movement. The specific connection structure is as follows:

[0061] It includes a hinge fixing member and a rotation module built inside the hinge fixing member. Rotation modules are provided at both ends of the hinge fixing member. Hinge brackets 2 are symmetrically arranged on both sides of each rotation module, and the hinge brackets 2 are assembled and connected to the rotation module. Furthermore, there are two parallel hinge brackets 2 on the same side of the hinge fixing member. A hinge housing 19 is installed on the two hinge brackets 2 on the same side of the hinge fixing member. The function of the hinge housing 19 is to prevent dust and water, avoid increased wear between the gear parts of the first cam 7 due to dust in the folding module, and reduce the service life of the device. The upper housing 17 or the lower housing 18 is installed on the two hinge brackets 2 on the same side of the hinge fixing member to form a folding display device.

[0062] The present invention is not limited to the above-mentioned optional embodiments. Anyone can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A hinge mechanism that can maintain any angle and prevent over-bending, including a hinge fixing member, characterized in that, At least one end of the hinge fixing member is provided with a rotation module. The rotation module includes at least one rotation shaft. One end of the rotation shaft is connected to a hinge bracket, and the hinge bracket is provided with an anti-overbending component for limiting its rotation angle. The other end is provided with a first cam that rotates synchronously therewith. It further includes a second cam slidably disposed on the rotation shaft. The second cam is provided with an elastic member for driving it to contact and engage with the first cam. The first cam includes a gear portion and an A cam portion; the outer peripheral contour of the A cam portion is flush with the outer peripheral contour of the gear portion.

2. The hinge mechanism according to claim 1, which can maintain any angle and prevent over-bending, is characterized in that The rotation module further includes a module housing installed on the hinge fixing member. A gear support member is installed in the module housing. The hinge bracket is rotatably disposed in the gear support member, and one end of the hinge bracket is assembled with the rotation shaft.

3. The hinge mechanism according to claim 2, which can maintain any angle and prevent over-bending, is characterized in that, The anti-overbending component includes a limit boss disposed on the gear support member and a rotation boss disposed on the hinge bracket. The limit boss is located on the rotation movement track of the rotation boss.

4. The hinge mechanism according to claim 1, which can maintain any angle and prevent over-bending, is characterized in that, The hinge fixing member is provided as a symmetric body, and the hinge fixing member includes a fixing member base and a fixing member cover plate. The fixing member cover plate is installed on the fixing member base and forms an inner cavity therebetween. The rotation module is installed in the inner cavity.

5. The hinge mechanism according to claim 4, which can maintain any angle and prevent over-bending, is characterized in that, The anti-overbending component includes a limit bump disposed on the hinge bracket. The limit bump is limited by the fixing member base; a limit bump is provided at the end of the hinge bracket. When the hinge bracket moves to 180°, the gap between the fixing member base and the hinge bracket is 0 mm.

6. The hinge mechanism according to claim 1, which can maintain any angle and prevent over-bending, is characterized in that, The hinge brackets are symmetrically arranged on both sides of the end of the hinge fixing member, and the two hinge brackets on both sides of the same end are driven by the rotation module to perform synchronous linkage movement.

7. The hinge mechanism according to claim 6, which can maintain any angle and prevent over-bending, is characterized in that, The rotation module includes two symmetrically arranged rotation shafts. First cams are provided on each of the rotation shafts, and the gear portions of the first cams are meshed and driven. The rotation shafts are driven to perform synchronous linkage movement through the first cams.

8. The hinge mechanism according to claim 7, which can maintain any angle and prevent overbending, is characterized in that The second cam is simultaneously sleeved on the two rotation shafts, and one end of the second cam is provided with a B cam portion corresponding to and matching the A cam portion.

9. The hinge mechanism according to claim 2, which can maintain any angle and prevent overbending, is characterized in that, The elastic member is provided as a spring. The spring is sleeved on the rotation shaft, and one end of the spring abuts against the second cam, and the other end abuts against the module housing.

10. A foldable display device, comprising an upper housing and a lower housing that are symmetrically arranged, characterized in that, The upper housing and the lower housing are driven to move by the hinge mechanism capable of maintaining any angle and preventing overbending according to any one of claims 1-9.

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