Improved hot air hair straightening nursing device

Abstract

The utility model relates to the technical field of hair care tools, in particular to an improved hot air straight hair care device which comprises a shell, an airflow generating part and an air supply part, the airflow generating part and the air supply part are arranged in the shell, the air supply part is provided with an air channel, and the airflow generating part is communicated with the air channel. Airflow generated by the airflow generation part is blown out through the air supply part; a heating assembly is arranged in the air supply part; heat radiated by the heating assembly heats the air supply part or the airflow in the air supply part; a gap is formed between the two sets of air supply parts, and air outlets are formed in the same sides of the two sets of air supply parts; the two sets of air supply parts clamp external hair, and airflow generated by the airflow generating part is blown out from the air outlet after being heated by the heating assembly or the air supply parts heated by the heating assembly and acts on the external hair. According to the hair straightener, hair is clamped, heated and blown, external hair can be heated and straightened more evenly, the hair straightening effect is improved, the heating assembly is arranged in the air supply part, space can be saved, and the size of the air supply part is made to be small.

Description

TECHNICAL FIELD

[0001] The utility model relates to hair care tool technical field especially discloses an improved hot air straightening care device. BACKGROUND

[0002] With the increase of people's demand for personal image and daily care, various devices for hair care have emerged, among which the hot air straightener is particularly common. The traditional straightener usually directly contacts the hair with a high-temperature metal plate and applies pressure to straighten the hair in combination with hot air. However, the traditional straightener has some problems, for example: the heating component directly contacting the hair can easily cause local overheating, resulting in hair damage; at the same time, due to the limitation of structural design, the device is large in size, inconvenient to operate and inconvenient to carry.

[0003] In order to overcome the shortcomings of the traditional straightener, some new straighteners have introduced a hot air assisted heating method in design in recent years. Such straighteners usually use an airflow generating component to generate hot air, heat the airflow through a heating element, and then blow out the high-temperature airflow through an air duct to act on the hair. However, the existing hot air straightener still has some shortcomings. For example, the traditional plastic air duct material has poor thermal conductivity, which causes the airflow temperature to decrease and the heat of the heating element to be not fully utilized; at the same time, the structure inside the device is complex, the volume is large, and it is inconvenient to carry, which limits its convenience and applicability in daily life. SUMMARY

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the utility model is to provide a hot air straightening care device which has a simple structure inside the device, a small volume, high thermal efficiency, and fully utilizes the heat of the heating element.

[0005] To achieve the above-mentioned purpose, the utility model provides an improved hot air straightening care device, which comprises a shell, an airflow generating part and an air supply part arranged in the shell. The air supply part is provided with an air duct, and the airflow generating part is in communication with the air duct. The airflow generating part generates airflow which is blown out through the air supply part. The air supply part is provided with a heating assembly. The heating assembly radiates heat to heat the air supply part or the airflow in the air supply part. The air supply part is provided with two groups. A gap is provided between the two groups of air supply parts. The two groups of air supply parts are provided with air outlets on the same side. The two groups of air supply parts clamp external hair. The airflow generated by the airflow generating part is heated by the heating assembly and / or the air supply part, and then blown out from the air outlets to act on the external hair. The utility model can heat and straighten the external hair more uniformly by clamping the hair and heating the airflow, which improves the straightening effect. At the same time, the double function structure of the air supply part can reduce the damage to the hair caused by direct contact with the high-temperature surface, protect the health of the hair, and save space by arranging the heating assembly in the air supply part to make the air supply part smaller in size.

[0006] Further, the air supply part is an aluminum plate, and the air supply part is provided with a heating cavity independent of the air cavity, and the heating assembly is arranged in the heating cavity. The air supply part is composed of an aluminum plate, and the air supply part is provided with a heating cavity independent of the air cavity, and the heating assembly is arranged in the heating cavity. The air cavity through which the airflow passes does not directly contact the heating assembly. This design separates the air cavity and the heating cavity, allowing the airflow to maintain heat while avoiding excessive direct contact with the heating assembly, thereby improving safety. In addition, the aluminum plate, as a high-thermal-conductivity material, can quickly transfer heat, improve the heating efficiency of the device, and prevent the temperature of the airflow from dropping, ensuring stable output of hot air.

[0007] Further, the heating assembly is a PTC heater. The PTC material has the characteristic that its resistance increases when the temperature rises, thereby limiting the current and preventing overheating. The PTC heater has the ability to self-regulate temperature, avoiding the risk of overheating of the device. This self-adaptive temperature control function can maintain a constant temperature and prevent hair from being damaged by overheating, increasing the safety and service life of the device.

[0008] Further, the hot air straightening device further comprises a connecting plate arranged on the air supply part, the connecting plate comprising a support part and front and rear cover plates arranged at both ends of the support part, the front and rear cover plates sealing the air duct at both ends respectively, the front cover plate being provided with an air inlet communicating with the air duct, and the airflow generating part being connected with the air inlet. The connecting plate ensures the sealing of the air duct, thereby improving the airflow transmission efficiency and preventing airflow leakage. The design of the support part provides stability to the overall device, and facilitates assembly and maintenance of the device.

[0009] Further, the air supply part is provided with a strip-shaped protrusion, the support part is provided with a limiting groove matched with the strip-shaped protrusion, and the connecting plate and the air supply part are connected through the strip-shaped protrusion and the limiting groove. This structure design connects the connecting plate and the air supply part through the plug-in mode, increases the stability and assembly precision between the components, and makes assembly and disassembly more convenient, thereby improving production and maintenance efficiency.

[0010] Further, a bracket is arranged between the connecting plate and the shell, a gasket is arranged between the connecting plate and the bracket, and a heat dissipation cavity is formed between the connecting plate and the bracket through the gasket. The heat dissipation cavity can effectively reduce the internal temperature of the device, prevent overheating of the device, and improve the safety and service life of the device. Through the design of the heat dissipation cavity, the stability of the device during long-term use can be improved, and internal overheating damage can be prevented.

[0011] Further, one side of the bracket close to the air outlet is provided with an inclined guide surface, and the air outlet and the inclined guide surface cooperate to form a wind gathering area, further improving the straightening and drying effect, and reducing the complexity of manual operation.

[0012] Further, the shell is provided with a V-shaped groove near one end of the air supply part, and the V-shaped groove is communicated with the gap. The V-shaped groove can guide the hair to smoothly enter the gap between the two air supply parts. This design makes the device more convenient to operate, reduces the difficulty of hair entering the working area, and improves the comfort and accuracy of operation.

[0013] Further, the airflow generating part comprises a three-way air duct, one end of the three-way air duct is formed with an air inlet part, the other two ends of the three-way air duct are formed with air outlet parts, the air outlet parts are communicated with the air duct, the air inlet part is provided with a mounting seat, the mounting seat is provided with a heating assembly and a fan; the airflow generated by the fan is heated by the heating assembly and then flows into the air supply part through the three-way air duct. The three-way air duct design can effectively distribute the airflow, ensure sufficient and uniform airflow for each air supply part, improve the heating efficiency of the device by preheating the airflow entering the air supply part, and the temperature of the heated airflow is more stable, thereby enhancing the straightening and drying effect.

[0014] Further, the mounting seat comprises a fixed ring and an arc-shaped mounting plate, the fixed ring is adapted to the shape of the inlet of the air inlet part and is fixedly installed on the inner wall of the air inlet part, the outer periphery of the fixed ring is provided with a positioning column, the positioning column is connected with the arc-shaped mounting plate, the inner wall of the arc-shaped mounting plate abuts against the outer wall of the air inlet part, and the arc-shaped mounting plate is connected with the shell. This structure design ensures the stable connection of the air inlet part and the shell, avoids loosening of the components due to vibration or long-term use, the arc-shaped mounting plate design not only enhances the structural strength of the equipment, but also optimizes the airflow guidance, makes the airflow flow more smoothly into the air duct, and improves the working efficiency of the device.

[0015] The utility model discloses the beneficial effect has: the utility model discloses through clamping hair and heating blow, can more evenly heat and straighten to external hair, promote straightening effect, simultaneously, the double function structure of air supply part can reduce the damage caused by the direct contact of hair with high temperature surface, protect hair health, and heating assembly sets up in the air supply part can save the space, makes the air supply part size small;

[0016] The air supply part is composed of an aluminum plate, which is provided with a heating cavity independent of the air cavity. The heating assembly is arranged in the heating cavity, and the air cavity through which the airflow passes does not directly contact the heating assembly. This design separates the air cavity and the heating cavity, allowing the airflow to maintain heat while avoiding excessive direct contact with the heating assembly, thereby improving safety. In addition, the aluminum plate, as a high-thermal-conductivity material, can quickly transfer heat, improve the heating efficiency of the device, and prevent the temperature of the airflow from dropping, ensuring stable output of hot air.

[0017] The PTC material has the characteristic that its resistance increases when the temperature rises, thereby limiting the current and preventing overheating, the PTC heater has the ability of self-regulating temperature, avoiding the risk of overheating of the equipment, the self-adaptive temperature control function can maintain constant temperature and prevent the hair from being damaged due to overheating, and the safety and service life of the equipment are increased. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 An exploded view of the improved hot air straightening care device;

[0019] Figure 2 A structure schematic view of the improved hot air straightening care device;

[0020] Figure 3 An exploded view of the air supply part of the utility model;

[0021] Figure 4 A sectional view of the air supply part of the utility model;

[0022] Figure 5 A sectional view of the airflow generating part of the utility model;

[0023] Figure 6 A structure schematic view of the three-way air guide pipe of the utility model;

[0024] Figure 7 A structure schematic view of the fixing ring of the utility model.

[0025] The reference signs include:

[0026] 1, shell; 2, airflow generating part; 3, air supply part; 4, air duct; 5, heating assembly; 6, gap; 7, air outlet; 8, heating cavity; 9, connecting plate; 10, supporting part; 11, front cover plate; 12, rear cover plate; 13, strip-shaped protrusion; 14, limiting groove; 15, support; 16, gasket; 17, heat dissipation cavity; 18, wind gathering area; 19, V-shaped groove; 20, three-way air guide pipe; 21, air inlet part; 22, air outlet part; 23, mounting seat; 24, heating assembly; 25, fan; 26, fixing ring; 27, arc-shaped mounting plate; 28, positioning column; 29, air inlet. DETAILED DESCRIPTION

[0027] In order to further illustrate the technical means and effects adopted by the utility model to achieve the predetermined utility model purposes, the specific embodiments, structures, features and effects according to the utility model will be described in detail as follows in combination with the drawings and preferred embodiments.

[0028] Please refer to Figures 1 to 7As shown, the improved hot air straightening nursing device, which comprises a shell 1 and an airflow generating part 2 and a blowing part 3 arranged in the shell 1, the blowing part 3 is provided with an air duct 4, the airflow generating part 2 is communicated with the air duct 4, the airflow generating part 2 generates airflow which is blown out through the blowing part 3, the blowing part 3 is provided with a heating assembly 5, the heating assembly 5 radiates heat to heat the blowing part 3 or the airflow in the blowing part 3; the blowing part 3 is provided with two groups, a gap 6 is arranged between the two groups of blowing part 3, and an air outlet 7 is arranged on the same side of the two groups of blowing part 3; the two groups of blowing part 3 clamp external hair, the airflow generated by the airflow generating part 2 is blown out from the air outlet 7 after being heated by the heating assembly 5 and / or the blowing part 3 heated by the heating assembly 5, and acts on the external hair. The utility model can heat and straighten the external hair more evenly by clamping the hair and heating and blowing, improve the straightening effect, at the same time, the double function structure of the blowing part 3 can reduce the damage caused by the direct contact of the hair with the high-temperature surface, protect the health of the hair, and the heating assembly 5 arranged in the blowing part 3 can save space and make the size of the blowing part 3 smaller.

[0029] The blowing part 3 is an aluminum plate, the blowing part 3 is provided with a heating cavity 8 independent of the air cavity, and the heating assembly 5 is arranged in the heating cavity 8. The blowing part 3 is composed of an aluminum plate, the inside of the blowing part 3 is provided with a heating cavity 8 independent of the air cavity, and the heating assembly 5 is arranged in the heating cavity 8, and the air cavity through which the airflow passes does not directly contact the heating assembly 5. This design separates the air cavity and the heating cavity 8, so that the airflow can maintain heat while avoiding excessive direct contact with the heating assembly 5, thereby improving safety. In addition, the aluminum plate, as a high-thermal-conductivity material, can quickly transfer heat, improve the heating efficiency of the device, and at the same time avoid the temperature drop of the airflow, ensuring the stable output of hot air.

[0030] Specifically, in the present embodiment, the heating assembly 5 is located in the heating cavity 8 to heat the blowing part 3, and the heat radiated by the blowing part 3 heats the airflow in the blowing part 3.

[0031] The heating assembly 5 is a PTC heater. The PTC material has the characteristic that its resistance increases when the temperature rises, thereby limiting the current and preventing overheating. The PTC heater has the ability to self-regulate temperature, avoiding the risk of overheating of the device. This self-adaptive temperature control function can maintain a constant temperature, prevent the hair from being damaged due to overheating, and increase the safety and service life of the device.

[0032] The hot air straightening device further comprises a connecting plate 9 arranged on the air supply part 3, the connecting plate 9 comprising a support part 10 and front and rear cover plates 11 and 12 arranged at both ends of the support part 10, the front and rear cover plates 11 and 12 sealing both ends of the air duct 4 respectively, the front cover plate 11 being provided with an air inlet 29 communicating with the air duct 4, and the airflow generating part 2 being connected with the air inlet 29. The connecting plate 9 ensures the sealing of the air duct 4, thereby improving the airflow transmission efficiency and preventing airflow leakage, and the design of the support part 10 provides stability for the whole device and facilitates the assembly and maintenance of the device.

[0033] The air supply part 3 is provided with a strip-shaped protrusion 13, and the support part 10 is provided with a limiting groove 14 matched with the strip-shaped protrusion 13, and the connecting plate 9 is inserted with the air supply part 3 via the strip-shaped protrusion 13 and the limiting groove 14. This structure connects the connecting plate 9 and the air supply part 3 by insertion, which increases the stability and assembly precision between the components, and makes the assembly and disassembly more convenient and improves the production and maintenance efficiency.

[0034] Specifically, the support part 10 is two independent plate bodies, one plate body is connected with the front cover plate 11, and the other plate body is connected with the rear cover plate 12, and the two plate bodies are respectively connected with the air supply part 3 to seal both ends of the air duct 4.

[0035] A bracket 15 is arranged between the connecting plate 9 and the shell 1, a gasket 16 is arranged between the connecting plate 9 and the bracket 15, and a heat dissipation cavity 17 is formed between the connecting plate 9 and the bracket 15 via the gasket 16. The heat dissipation cavity 17 can effectively reduce the internal temperature of the device, prevent overheating of the equipment, and improve the safety and service life of the equipment. Through the design of the heat dissipation cavity 17, the stability of the equipment during long-time use can also be improved, and internal overheating damage can be prevented.

[0036] One side of the bracket 15 close to the air outlet 7 is provided with an inclined guide surface, and the air outlet 7 and the inclined guide surface cooperate to form a wind gathering area 18. After the hair enters the gap 6, the two air supply parts 3 clamp the hair, and the air supply part 3 heated by the PTC heater softens the hair. The airflow generating part 2 provides hot air to accelerate the drying and softening of the hair or provides cold air to rapidly cool the hair to shape the hair. The user slowly pulls the device along the direction of the hair tips with appropriate force to achieve good drying and straightening effect.

[0037] Specifically, the gasket 16 is made of silica gel, which provides support for the air supply part 3 while allowing it to produce fine displacement with pressure changes. This floating design allows the device to automatically adjust according to the thickness and density of the hair when clamping the hair, maintaining a constant clamping force.

[0038] The shell 1 is provided with a V-shaped groove 19 near one end of the air supply part 3, and the V-shaped groove 19 is communicated with the gap 6. The V-shaped groove 19 can guide the hair to smoothly enter the gap 6 between the two groups of air supply parts 3. This design makes the device more convenient to operate, reduces the difficulty of hair entering the working area, and improves the comfort and accuracy of operation.

[0039] Specifically, when the unfolding rotation angle of the two groups of air supply parts 3 is not large enough, it will cause the problem of difficult entry of hair. Therefore, the V-shaped groove 19 is arranged at one end of the shell 1 near the air supply part 3. When the user uses it, the hair enters from the end face, and the V-shaped groove 19 can play a guiding role to guide the hair to the middle position between the two groups of air supply parts 3, so that the hair can more smoothly enter the straightener, thereby improving the user experience.

[0040] The air flow generating part 2 includes a three-way air duct 20, one end of the three-way air duct 20 is formed with an air inlet part 21, the other two ends of the three-way air duct 20 are formed with air outlet parts 22, the air outlet parts 22 are communicated with the air duct 4, the air inlet part 21 is provided with a mounting seat 23, the mounting seat 23 is provided with a heating assembly 24 and a fan 25; the air flow generated by the fan 25 is heated by the heating assembly 24 and then flows into the air supply part 3 through the three-way air duct 20. The design of the three-way air duct 20 can effectively distribute the air flow, ensure that the air flow of each air supply part 3 is sufficient and uniform, and the preheated air flow enters the air supply part 3, which improves the heating efficiency of the device, and the temperature of the air flow after heating is more stable, thereby enhancing the straightening and drying effect.

[0041] The mounting seat 23 includes a fixed ring 26 and an arc-shaped mounting plate 27, the fixed ring 26 is adapted to the shape of the inlet of the air inlet part 21 and is fixedly installed on the inner wall of the air inlet part 21, the outer periphery of the fixed ring 26 is provided with a positioning column 28, the positioning column 28 is connected with the arc-shaped mounting plate 27, the inner wall of the arc-shaped mounting plate 27 abuts against the outer wall of the air inlet part 21, and the arc-shaped mounting plate 27 is connected with the shell 1. This structure design ensures the stable connection of the air inlet part 21 and the shell 1, avoids the loosening of the components due to vibration or long-term use, the design of the arc-shaped mounting plate 27 not only enhances the structural strength of the equipment, but also optimizes the guidance of the air flow, so that the air flow flows more smoothly into the air duct 4, thereby improving the working efficiency of the device.

[0042] In the present embodiment, after the fan 25 is started, air is sucked in from the air inlet and a strong air flow is generated, which, after being preheated by the heating assembly 24, passes through the three-way air duct 20 to the air supply part 3, which is provided with a PTC heater. When the device is turned on, the PTC heater will quickly heat up and heat the air supply part 3 by radiation or conduction. The temperature of the PTC heater will automatically adjust according to its positive temperature coefficient (PTC) characteristics to prevent overheating. The air supply part 3 heated by the PTC heater heats the air flow in the air duct 4 by heat radiation. The air supply part 3 made of aluminum has good heat conduction performance, ensuring that the air flow can fully absorb heat when passing through, maintaining the effect of high-temperature hot air. The heated air flow passes through the air duct 4 in the air supply part 3 and is finally blown out from the air outlet 7 of the air supply part 3. The design of the air supply part 3 allows the air flow to clamp the hair from both sides, ensuring that the hot air can uniformly cover the surface of the hair. The hair passes through the gap 6 between the two air supply parts 3, and the air supply part 3 uniformly acts on the hair through the air outlets 7 on both sides. This design can improve the drying efficiency, and the hot air combined with the heating effect of the air supply part 3 can quickly straighten the hair without excessive physical pressure. The V-shaped groove 19 helps the user to smoothly guide the hair into the device, thereby improving the overall operation experience.

[0043] Before use, the user can first divide the hair into zones as needed and comb it to make the device better clamp the hair. A strand of hair is placed into the V-shaped groove 19 near one end of the air supply part 3. The guiding effect of the V-shaped groove 19 can help the hair naturally slide into the gap 6 between the two air supply parts 3. After the hair enters the gap 6, the device is gently closed, and the two air supply parts 3 clamp the hair. At this time, the hot air provided by the air flow generating part 2 has been blown to both sides of the hair through the heated air supply part 3. The user slowly pulls the device along the direction of the hair tips with appropriate force. In this process, the hot air blows uniformly to both sides of the hair, and the heat helps to evaporate the moisture and set the hair, or the air flow generating part 2 provides cold air to quickly cool the hair to set the hair. According to the length and thickness of the hair, the user can operate by strand. A small amount of hair is clamped each time, so that each strand of hair can be uniformly heated to achieve good drying and straightening effect.

[0044] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with a preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, equivalent change and modification of the above embodiments based on the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. An improved hot air hair straightening device, comprising a housing (1) and an airflow generating part (2) and an air supply part (3) disposed within the housing (1), wherein the air supply part (3) is provided with an air duct (4), the airflow generating part (2) is connected to the air duct (4), and the airflow generated by the airflow generating part (2) is blown out through the air supply part (3); characterized in that: The air supply section (3) is equipped with a heating component (5), and the heat radiated by the heating component (5) heats the air supply section (3) or the airflow in the air supply section (3); the air supply section (3) is provided in two sets, and a gap (6) is provided between the two sets of air supply sections (3), and an air outlet (7) is provided on the same side of the two sets of air supply sections (3); the two sets of air supply sections (3) clamp the external hair, and the airflow generated by the airflow generating section (2) is heated by the heating component (5) and / or the air supply section (3) heated by the heating component (5) and then blown out from the air outlet (7) to act on the external hair.

2. The improved hot air hair straightening device according to claim 1, characterized in that: The air supply section (3) is an aluminum plate, and the air supply section (3) is provided with a heating chamber (8) that is independent of the air cavity. The heating component (5) is placed in the heating chamber (8).

3. The improved hot air hair straightening device according to claim 1, characterized in that: The heating component (5) is a PTC heater.

4. The improved hot air hair straightening device according to claim 1, characterized in that: The hot air straightening hair care device also includes a connecting plate (9) set on the air supply part (3). The connecting plate (9) includes a support part (10) and a front cover plate (11) and a rear cover plate (12) set at both ends of the support part (10). The front cover plate (11) and the rear cover plate (12) respectively seal the two ends of the air duct (4). The front cover plate (11) is provided with an air inlet (29) connecting the air duct (4). The airflow generating part (2) is connected to the air inlet (29).

5. An improved hot air hair straightening device according to claim 4, characterized in that: The air supply part (3) is provided with a strip-shaped protrusion (13), and the support part (10) is provided with a limiting groove (14) that matches the strip-shaped protrusion (13). The connecting plate (9) and the air supply part (3) are connected by the strip-shaped protrusion (13) and the limiting groove (14).

6. An improved hot air hair straightening device according to claim 4, characterized in that: A bracket (15) is provided between the connecting plate (9) and the housing (1), and a washer (16) is provided between the connecting plate (9) and the bracket (15). A heat dissipation cavity (17) is formed between the connecting plate (9) and the bracket (15) via the washer (16).

7. The improved hot air hair straightening device according to claim 1, characterized in that: The bracket (15) has an inclined guide surface on the side near the air outlet (7). The air outlet (7) and the inclined guide surface cooperate to form a wind gathering area (18). The wind gathering area (18) creates a negative pressure between the two sets of air supply parts (3), driving the external hair through the gap (6), thereby making reasonable use of the residual heat of the heating component (5) to act on the external hair.

8. The improved hot air hair straightening device according to claim 1, characterized in that: The housing (1) has a V-shaped groove (19) at one end near the air supply part (3), and the V-shaped groove (19) is connected to the gap (6).

9. An improved hot air hair straightening device according to claim 1, characterized in that: The airflow generating part (2) includes a three-way air duct (20), one end of which forms an air inlet (21), and the other two ends of which form air outlets (22). The air outlets (22) are connected to the air duct (4). The air inlet (21) is provided with a mounting base (23), and the mounting base (23) is provided with a heating element (24) and a fan (25). The airflow generated by the fan (25) is heated by the heating element (24) and then flows into the air supply part (3) through the three-way air duct (20).

10. An improved hot air hair straightening device according to claim 9, characterized in that: The mounting base (23) includes a fixing ring (26) and an arc-shaped mounting plate (27). The fixing ring (26) is adapted to the inlet shape of the air inlet (21) and is fixedly installed on the inner wall of the air inlet (21). The outer periphery of the fixing ring (26) is provided with a positioning post (28). The positioning post (28) is connected to the arc-shaped mounting plate (27). The inner wall of the arc-shaped mounting plate (27) abuts against the outer wall of the air inlet (21). The arc-shaped mounting plate (27) is connected to the housing (1).

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