Die adhesive force adjusting system

Abstract

The utility model provides a mold adhesive force adjusting system, which relates to the technical field of contact lens production, and comprises a plasma processing device, a first driving mechanism, a carrier, a baffle plate and a fourth driving mechanism, the carrier is provided with a plurality of female die bearing grooves, the shielding plate is located above the carrier, and the fourth driving mechanism is connected with the shielding plate to drive the shielding plate to approach the carrier in the vertical direction; the plasma processing device is located above the shielding plate, and the first driving mechanism is connected with the plasma processing device to drive the plasma processing device to horizontally move to be sequentially aligned with the female die bearing grooves. According to the mold adhesive force adjusting system provided by the utility model, the plasma processing device can horizontally move to sweep over each female mold bearing groove, so that the adhesive force of each optical mold is changed in batches, and the mass production of lenses can be realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to contact lens production technical field especially is related to a mould adhesion force adjusting system. BACKGROUND

[0002] With the growth of ophthalmic lens industry, the demand for contact lenses is also increasing. The sharp increase in production demand forces manufacturers to find a process and method that can mass-produce contact lenses.

[0003] One of the existing mature production processes is injection molding process, that is, liquid contact lens raw material monomers are placed between two molds to polymerize and solidify into a suitable shape. Then by controlling the mold material and process parameters, the lens formed by the raw material monomers is attached to a specific mold.

[0004] In the process of preparing contact lenses, the existing technology reduces the mold separation force after the lens material is formed in the mold by introducing a normal pressure plasma stream to the forming surface of the mold for manufacturing ophthalmic lenses and improving the surface hydrophobicity of the mold surface. However, the plasma processing system in the prior art cannot achieve mass production of lenses. SUMMARY

[0005] The utility model aims at providing a mould adhesion force adjusting system, wherein the plasma processing device can move horizontally across each master mold bearing groove, batch change the adhesion force of each optical mold, and mass production of lenses can be realized.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] The utility model provides a mould adhesion force adjusting system, which comprises a plasma processing device, a first driving mechanism, a carrier, a shielding plate and a fourth driving mechanism.

[0008] The carrier has a plurality of master mold bearing grooves, the shielding plate is located above the carrier, and the fourth driving mechanism is connected with the shielding plate to drive the shielding plate to move vertically close to the carrier.

[0009] The plasma processing device is located above the shielding plate, and the first driving mechanism is connected with the plasma processing device to drive the plasma processing device to move horizontally and align with each master mold bearing groove in turn.

[0010] Compared with the prior art, the mold adhesion force adjusting system provided by the utility model works, each mold is located in each female mold bearing groove, the plasma processing device can blow the plasma wind to the female mold bearing groove through the shielding plate, the first driving mechanism drives the plasma processing device to horizontally move and sweep each female mold bearing groove, the adhesion force of each optical mold is changed in batches, and mass production of lenses can be realized.

[0011] Further, the third driving mechanism is connected with the carrier to drive the carrier to horizontally move.

[0012] The third driving mechanism can adjust the horizontal position of the carrier relative to the plasma processing device, when the first driving mechanism drives the plasma processing device to move along the length direction, the third driving mechanism can drive the carrier to move along the width direction, so that the plasma processing device blows the plasma wind to each female mold bearing groove in cooperation with the first driving mechanism, and mass production of lenses is facilitated.

[0013] Further, the plasma processing device comprises a plasma head, a first sliding seat, a second sliding seat and a second driving mechanism, the first sliding seat is connected with the first driving mechanism, the second driving mechanism is connected between the first sliding seat and the second sliding seat to drive the second sliding seat to vertically move relative to the first sliding seat, and the plasma head is connected with the second sliding seat.

[0014] The above-mentioned mode can realize the adjustment of the height of the plasma head, and the plasma head can move from a suitable height to blow the plasma wind to each female mold bearing groove.

[0015] Further, the surface of the shielding plate away from the carrier is concave and provided with a plurality of grooves in one-to-one correspondence with the plurality of female mold bearing grooves, the caliber of the grooves gradually decreases along the direction gradually close to the carrier, and the surface of the shielding plate facing the carrier is convex and provided with a plurality of protrusions in one-to-one adaptation with the shapes of the plurality of female mold bearing grooves.

[0016] The above-mentioned mode can adjust the size of the plasma wind through the shielding of the grooves and the adjustment of the height thereof, and can avoid the problem of excessive plasma wind. Meanwhile, the surface of the shielding plate facing the carrier can be more fitted to the shape of the female mold bearing groove, so that the female mold is more stably placed in the female mold bearing groove.

[0017] Further, the fourth driving mechanism comprises a bottom plate, a fourth driver and a sliding frame, the sliding frame is in sliding fit with the bottom plate in the vertical direction, the fourth driver is installed on the bottom plate, the fourth driver is connected with the sliding frame to drive the sliding frame to vertically move, and the shielding plate is installed on the sliding frame.

[0018] In the scheme, the shielding plate can be installed on the sliding frame, the sliding frame can support different points on the shielding plate, thereby facilitating the placement of the carrier under the shielding plate, and the grooves on the shielding plate can be aligned with the female mold bearing grooves one by one.

[0019] Further, the sliding frame comprises a lower frame body, an upper frame body and a slide rod assembly, the slide rod assembly is in sliding fit with the bottom plate and connected between the lower frame body and the upper frame body, and the shielding plate is installed on the upper frame body.

[0020] In the scheme, the lower frame body and the upper frame body in the sliding frame are connected through the slide rod assembly, a stable support structure can be formed, the bottom plate can guide the sliding of the slide rod assembly, and the stability of the sliding frame during vertical movement is ensured.

[0021] Further, the fifth driver is arranged on the sliding frame and connected with the shielding plate to drive the horizontal movement of the shielding plate, and the shielding plate moves horizontally synchronously with the carrier in the same direction during the operation of the plasma processing device.

[0022] During the operation of the plasma processing device, the fifth driver can drive the shielding plate to move horizontally synchronously with the carrier in the same direction, so that the grooves on the shielding plate can be aligned with the female mold bearing grooves one by one.

[0023] Further, the distribution direction of the plurality of female mold bearing grooves comprises a length direction and a width direction perpendicular to the length direction, and the shielding plate and the carrier move along one of the length direction and the width direction.

[0024] In the scheme, the shielding plate and the carrier can move synchronously, and the first driving mechanism can realize the blowing of the plasma wind to each female mold bearing groove.

[0025] Further, the first driving mechanism drives the plasma processing device to move along the other of the length direction and the width direction.

[0026] In the scheme, the moving direction of the plasma processing device is different from the moving direction of the shielding plate and the carrier, and the blowing of the plasma wind to each female mold bearing groove can be realized.

[0027] Further, the third driving mechanism comprises a mounting seat and a third driver, the mounting seat is installed on the side of the bottom plate away from the fourth driver, the sliding frame penetrates through the mounting seat, and the third driver is installed on the mounting seat and connected with the carrier.

[0028] The above arrangement can make full use of the space on the upper part of the bottom plate, so that the structure of the system is more compact. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the description of the embodiments or the prior art. Obviously, the drawings described below are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0030] Figure 1 A three-dimensional structure schematic diagram of a mold adhesion force adjusting system provided by the embodiment of the present application under a first viewing angle;

[0031] Figure 2 A three-dimensional structure schematic diagram of a mold adhesion force adjusting system provided by the embodiment of the present application under a second viewing angle;

[0032] Figure 3 A three-dimensional structure schematic diagram of a shielding plate provided by the embodiment of the present application under a first viewing angle;

[0033] Figure 4 A three-dimensional structure schematic diagram of a shielding plate provided by the embodiment of the present application under a second viewing angle;

[0034] Figure 5 A front view of a mold adhesion force adjusting system provided by the embodiment of the present application.

[0035] Icon: 1-plasma processing device; 11-plasma head; 12-first sliding seat; 121-scale; 13-second sliding seat; 131-indicator block; 14-second driving mechanism; 2-first driving mechanism; 3-carrier; 4-third driving mechanism; 41-mounting seat; 42-third driver; 5-shielding plate; 51-groove; 52-protrusion; 6-fourth driving mechanism; 61-bottom plate; 62-fourth driver; 63-sliding frame; 631-lower frame body; 632-upper frame body; 633-sliding rod assembly; 64-fifth driver. DETAILED DESCRIPTION

[0036] The technical solutions of the present application will be described below in connection with the drawings, obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0037] In the description of the utility model, it needs to explain, the term "center", "upper", "lower", "left", "right", "vertical", "horizontal", "internal", "external" and so on indicate the orientation or position relation based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and not indicate or imply that the device or element indicated must have a particular orientation, construct and operate in a particular orientation, therefore, it cannot be understood as the limitation of the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the utility model, it needs to explain, unless otherwise expressly provided and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0039] The specific embodiments of the utility model are described in detail below in combination with the drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the utility model, and are not used to limit the utility model.

[0040] The embodiment is to provide a mold adhesion force adjusting system, as shown in Figure 1 and Figure 2 , including plasma processing device 1, first driving mechanism 2, carrier 3, shielding plate 5 and fourth driving mechanism 6;

[0041] Carrier 3 has a plurality of female mold carrying grooves, shielding plate 5 is located above carrier 3, fourth driving mechanism 6 is connected with shielding plate 5 to drive shielding plate 5 to approach carrier 3 along the vertical direction;

[0042] Plasma processing device 1 is located above shielding plate 5, first driving mechanism 2 is connected with plasma processing device 1 to drive plasma processing device 1 to move horizontally and sequentially align each female mold carrying groove.

[0043] As shown in Figure 1 , in use, each female mold can be placed in each female mold carrying groove of carrier 3, fourth driving mechanism 6 drives shielding plate to approach carrier 3 along the vertical direction, first driving mechanism 2 drives plasma processing device 1 to move horizontally and sweep through each female mold carrying groove, the adhesion force of each optical module can be changed in batches, and the mass production of lenses can be realized.

[0044] The multiple mold support grooves can be arranged in a straight line, a matrix, or other shapes. When arranged in a straight line, the first driving mechanism 2 can drive the plasma processing device 1 to move along the distribution direction of the multiple mold support grooves. When the multiple mold support grooves are arranged in a matrix or other shapes, the distribution direction of the multiple mold support grooves includes the length direction and the width direction perpendicular to the length direction. The first driving mechanism 2 can drive the plasma processing device 1 to move along the aforementioned length direction and / or width direction.

[0045] by Figure 1 For example, the first driving mechanism 2 can drive the plasma processing device 1 to move along the aforementioned length direction. For example, the first driving mechanism 2 can be a combination of a linear guide rail and a cylinder, and the reciprocating motion of the cylinder piston can drive the plasma processing device 1 to slide along the guide rail; or the first driving mechanism 2 can be a linear motor, which can convert electrical energy into linear motion; or the first driving mechanism 2 can be a combination of a motor and a lead screw and nut transmission assembly, and the relative rotational motion between the lead screw and the nut can convert the rotational motion of the motor into linear motion. The plasma processing device 1 can be connected to the nut, and the plasma processing device 1 can slide and cooperate with the fixed bracket along the moving direction; or a combination of a motor and a gear and rack transmission assembly can be used, and the movement of the plasma processing device 1 can be achieved by the cooperation of one or more gears and racks.

[0046] When the first driving mechanism 2 can drive the plasma processing device 1 to move along the length and width directions, the first driving mechanism 2 can be a combination of any two structures capable of linear motion.

[0047] In alternative implementations, such as Figure 1 and Figure 2 As shown, the mold adhesion adjustment system also includes a third drive mechanism 4, which is connected to the carrier 3 to drive the carrier 3 to move horizontally.

[0048] The third drive mechanism 4 can adjust the horizontal position of the carrier 3 relative to the plasma processing device 1. When the first drive mechanism 2 drives the plasma processing device 1 to move along the length direction, the third drive mechanism 4 can drive the carrier 3 to move along the width direction, thereby cooperating with the first drive mechanism 2 to realize that the plasma processing device 1 blows plasma air onto each master mold bearing slot, which is convenient for mass production of lenses.

[0049] By controlling the speed of the first drive mechanism 2 and the third drive mechanism 4, the speed of the plasma wind passing through each mold bearing groove can be adjusted, thereby adjusting the size of the plasma wind blowing into each mold bearing groove.

[0050] It can be understood that when the first driving mechanism 2 drives the plasma processing device 1 to move along the width direction, the third driving mechanism 4 can drive the carrier 3 to move along the length direction.

[0051] As shown in Figure 1 and Figure 2 , the third driving mechanism 4 comprises a mounting base 41 and a third driver 42, the third driver 42 is mounted on the mounting base 41 and connected with the carrier 3 to drive the carrier 3 to move horizontally.

[0052] The alternative structure of the third driver 42 is similar to the alternative structure of the first driving mechanism 2, and since the alternative structure of the first driving mechanism 2 has been described in detail above, the alternative structure of the third driver 42 will not be described here in detail.

[0053] In the alternative embodiment, as shown in Figure 1 , the plasma processing device 1 comprises a plasma head 11, a first sliding base 12, a second sliding base 13 and a second driving mechanism 14, the first sliding base 12 is connected with the first driving mechanism 2, the second driving mechanism 14 is connected between the first sliding base 12 and the second sliding base 13, and the plasma head 11 is connected with the second sliding base 13.

[0054] In use, the second driving mechanism 14 can drive the second sliding base 13 to move vertically relative to the first sliding base 12, so as to adjust the height of the plasma head 11, and the plasma head 11 can be moved from a suitable height to blow the plasma wind to each mother die carrying groove.

[0055] The second driving mechanism 14 can be similar to the first driving mechanism 2 in the way of driving the second sliding base 13 to move vertically relative to the first sliding base 12, of course, the second driving mechanism 14 can also be manually adjusted.

[0056] As shown in Figure 1 , the second driving mechanism 14 comprises a hand wheel and a screw rod, the second sliding base 13 is in sliding fit with the first sliding base 12 in the vertical direction, in use, the hand wheel can be manually rotated to drive the screw rod to rotate, the screw rod is in threaded fit with the second sliding base 13, when the screw rod rotates, the second sliding base 13 can slide relative to the first sliding base 12 in the vertical direction to adjust the height of the plasma head 11.

[0057] Specifically, as shown in Figure 2 , the first sliding base 12 is provided with a scale 121 extending in the vertical direction, and the second sliding base 13 is provided with an indicating block 131 aligned with the scale 121. When adjusting the height of the plasma head 11, the position of the plasma head 11 can be known through the scale number aligned by the indicating block 131, so as to facilitate the user to more accurately adjust the height of the plasma head 11.

[0058] In optional embodiments, as shown in Figure 3 The surface of the shielding plate 5 away from the carrier 3 is concave and provided with a plurality of grooves 51 corresponding to the plurality of female mold carrying grooves, and the caliber of the grooves 51 gradually decreases in the direction gradually close to the carrier 3.

[0059] In the above-mentioned embodiments, the shielding plate 5 is designed with grooves 51, and through the shielding of the grooves 51 and the adjustment of the height thereof, the size of the plasma wind can be adjusted, and the problem of excessive plasma wind can be avoided.

[0060] As shown in Figure 3 The grooves 51 are distributed in a matrix, including four rows and four columns of grooves 51, and correspondingly, the carrier 3 also has four rows and four columns of female mold carrying grooves, and at this time, the length direction of the female mold carrying grooves is equal to the width direction.

[0061] In optional embodiments, as shown in Figure 4 The surface of the shielding plate 5 facing the carrier 3 is convex and provided with a plurality of protrusions 52 corresponding to the shapes of the plurality of female mold carrying grooves.

[0062] The above-mentioned arrangement can make the surface of the shielding plate 5 facing the carrier 3 more conform to the shape of the female mold carrying groove, and ensure that the female mold is more stably placed in the female mold carrying groove.

[0063] Since the fourth driving mechanism 6 is used to drive the shielding plate 5 to move linearly in the vertical direction, the optional structure of the fourth driving mechanism 6 is similar to that of the first driving mechanism 2, and for the sake of brevity, the optional structure of the fourth driving mechanism 6 will not be exemplified one by one.

[0064] In optional embodiments, as shown in Figure 1 The fourth driving mechanism 6 includes a bottom plate 61, a fourth driver 62 and a sliding frame 63, the sliding frame 63 is in sliding fit with the bottom plate 61 in the vertical direction, the fourth driver 62 is installed on the bottom plate 61, the fourth driver 62 is connected with the sliding frame 63, and the shielding plate 5 is installed on the sliding frame 63.

[0065] In use, the fourth driver 62 is actuated to drive the sliding frame 63 to move relative to the bottom plate 61 in the vertical direction, thereby adjusting the height of the shielding plate 5. In the above-mentioned embodiments, since the shielding plate 5 can be installed on the sliding frame 63, the sliding frame 63 can support different points of the shielding plate 5, thereby facilitating the placement of the carrier 3 below the shielding plate 5, so that the grooves 51 on the shielding plate 5 can be aligned with each female mold carrying groove.

[0066] In optional embodiments, as shown in Figure 2As shown, the sliding frame 63 includes a lower frame 631, an upper frame 632, and a sliding rod assembly 633. The sliding rod assembly 633 is slidably engaged with the base plate 61 and connected between the lower frame 631 and the upper frame 632. The baffle plate 5 is installed on the upper frame 632.

[0067] In the above embodiments, the lower frame 631 and the upper frame 632 of the sliding frame 63 are connected by the sliding rod assembly 633 to form a stable support structure. The base plate 61 can guide the sliding of the sliding rod assembly 633, thereby ensuring the stability of the sliding frame 63 when it moves vertically.

[0068] The slide bar assembly 633 may include multiple slide bars, with each slide bar having its two ends connected to the lower frame 631 and the upper frame 632, respectively.

[0069] In addition, the fourth drive 62 can be a cylinder, with its cylinder body fixedly connected to the base plate 61 and its piston rod fixedly connected to the lower frame 631. The vertical movement of the sliding frame 63 is achieved by the extension and retraction of the piston rod.

[0070] like Figure 5 As shown, when the third drive mechanism 4 includes a mounting base 41 and a third driver 42, the mounting base 41 can be installed on the side of the base plate 61 opposite to the fourth driver 62, and the sliding bracket 63 passes through the mounting base 41.

[0071] The above configuration can make full use of the space above the base plate 61, making the system structure more compact.

[0072] Specifically, the upper frame 632 can be divided into two parts, one part supporting one side of the shield 5 and the other part supporting the other side of the shield 5, forming a passage for the vehicle 3 to pass through between the two parts.

[0073] In alternative implementations, such as Figure 5 As shown, the sliding frame 63 is provided with a fifth driver 64, which is connected to the baffle plate 5 to drive the baffle plate 5 to move horizontally. The baffle plate 5 can slide and cooperate with the sliding frame 63 along the sliding direction.

[0074] When the plasma processing device 1 is in operation, in order for the plasma to be blown to different mother mold support slots, the carrier 3 needs to move horizontally relative to the plasma processing device 1. At this time, the fifth actuator 64 needs to be activated so that the shielding plate 5 moves horizontally in the same direction as the carrier 3, ensuring that the grooves 51 on the shielding plate 5 can always be aligned with each mother mold support slot.

[0075] Specifically, both parts of the upper frame 632 are equipped with a fifth actuator 64, and the two fifth actuators 64 move synchronously to drive the shield 5 to move horizontally.

[0076] Since the fifth driver 64 is used to drive the shielding plate 5 to move linearly in the horizontal direction, the optional structure of the fifth driver 64 is similar to the optional structure of the first driving mechanism 2, and for the sake of brevity, the optional structure of the fifth driver 64 will not be exemplified one by one here.

[0077] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A mold adhesion force adjustment system characterized by, The plasma processing device (1), the first driving mechanism (2), the carrier (3), the shielding plate (5) and the fourth driving mechanism (6) are included. The carrier (3) has a plurality of female mold carrying grooves, the shielding plate (5) is located above the carrier (3), and the fourth driving mechanism (6) is connected with the shielding plate (5) to drive the shielding plate (5) to move vertically close to the carrier (3). The plasma processing device (1) is located above the shielding plate (5), and the first driving mechanism (2) is connected with the plasma processing device (1) to drive the plasma processing device (1) to move horizontally and sequentially align each female mold carrying groove.

2. The mold adhesion adjustment system of claim 1, wherein The third driving mechanism (4) is further included, and the third driving mechanism (4) is connected with the carrier (3) to drive the carrier (3) to move horizontally.

3. The mold adhesion adjustment system of claim 1, wherein The plasma processing device (1) includes a plasma head (11), a first sliding seat (12), a second sliding seat (13) and a second driving mechanism (14), the first sliding seat (12) is connected with the first driving mechanism (2), the second driving mechanism (14) is connected between the first sliding seat (12) and the second sliding seat (13) to drive the second sliding seat (13) to move vertically relative to the first sliding seat (12), and the plasma head (11) is connected with the second sliding seat (13).

4. The mold adhesion adjustment system of claim 1, wherein The surface of the shielding plate (5) away from the carrier (3) is concavely provided with a plurality of grooves (51) corresponding to the plurality of female mold carrying grooves, and the caliber of the grooves (51) gradually decreases in the direction gradually close to the carrier (3); and the surface of the shielding plate (5) facing the carrier (3) is convexly provided with a plurality of protrusions (52) corresponding to the plurality of female mold carrying grooves.

5. The mold adhesion adjustment system of claim 2, wherein The fourth driving mechanism (6) includes a bottom plate (61), a fourth driver (62) and a sliding frame (63), the sliding frame (63) is slidably connected with the bottom plate (61) in the vertical direction, the fourth driver (62) is installed on the bottom plate (61), the fourth driver (62) is connected with the sliding frame (63) to drive the sliding frame (63) to move vertically, and the shielding plate (5) is installed on the sliding frame (63).

6. The mold adhesion adjustment system of claim 5, wherein, The sliding frame (63) includes a lower frame body (631), an upper frame body (632) and a slide rod assembly (633), the slide rod assembly (633) is slidably connected with the bottom plate (61) and connected between the lower frame body (631) and the upper frame body (632), and the shielding plate (5) is installed on the upper frame body (632).

7. The mold adhesion adjustment system of claim 5, wherein The fifth driver (64) is arranged on the sliding frame (63), the fifth driver (64) is connected with the shielding plate (5) to drive the shielding plate (5) to move horizontally, and the shielding plate (5) moves horizontally synchronously in the same direction with the carrier (3) when the plasma processing device (1) works.

8. The mold adhesion adjustment system of claim 7, wherein, The distribution direction of the plurality of female mold bearing grooves includes a length direction and a width direction perpendicular to the length direction, and the shielding plate (5) and the carrier (3) move along one of the length direction and the width direction.

9. The mold adhesion adjustment system of claim 8, wherein, The first driving mechanism (2) drives the plasma processing device (1) to move along the other of the length direction and the width direction.

10. The mold adhesion adjustment system of claim 5, wherein, The third driving mechanism (4) includes a mounting seat (41) and a third driver (42), the mounting seat (41) is mounted on the side of the bottom plate (61) away from the fourth driver (62), the sliding frame (63) penetrates the mounting seat (41), and the third driver (42) is mounted on the mounting seat (41) and connected with the carrier (3).

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