CN220174808U

CN220174808U - Intelligent adjusting mattress for sleeping posture of whole human body

Info

Publication number: CN220174808U
Application number: CN202320848439.4U
Authority: CN
Inventors: 徐国芳
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-04-14
Filing date: 2023-04-14
Publication date: 2023-12-15
Anticipated expiration: 2033-04-14

Abstract

The utility model discloses an intelligent mattress for adjusting sleeping posture of a whole human body, and belongs to the technical field of air bag mattresses. The intelligent full-human sleeping posture adjusting mattress comprises a mattress body with an air pump, wherein folding air bags distributed in a diamond lattice are arranged in the middle of the mattress body, strip-shaped air bags are arranged on two sides of each folding air bag, and the folding air bags and the strip-shaped air bags are respectively communicated with the air pump; the mattress body includes from top to bottom in proper order: the folding air bags and the strip-shaped air bags pass through the first arranging layer and are at least partially positioned in the second arranging layer, the fixing layers are crossed, and the overlapping positions correspond to the positions of the folding air bags; the heating layers are arranged in the first placing layer and the second placing layer, and a sucking disc is arranged on one side, away from the first placing layer, of the second placing layer. The mattress can provide uniform and stable supporting force for a human body, can keep the constant temperature of the mattress body, and improves user experience.

Description

Intelligent adjusting mattress for sleeping posture of whole human body

Technical Field

The utility model relates to an intelligent mattress for adjusting sleeping posture of a whole human body, and belongs to the technical field of air bag mattresses.

Background

Along with the development of economy and the improvement of living standard of people, people pay more and more attention to the quality of sleep, and the mattress directly influences the quality of sleep. Mattresses are of a wide variety, with inflatable mattresses being popular with a wide range of people in recent years; compared with the traditional mattress, the inflatable mattress can enable the human body to be identical with the bed in percentage, and all parts of the human body are uniformly stressed, so that the blood circulation disorder caused by uneven stress of the traditional mattress is overcome. Therefore, inflatable mattresses are receiving increasing attention and use in the field of healthy sleep.

At present, an inflatable mattress is generally composed of air bags, when the air distribution in the air bags is uneven, or the air bags are too few and are unreasonable in distribution, the supporting force of the mattress is insufficient, and in addition, in the using process of the mattress supporting the air bags, the mattress and the bed body are separated due to small friction force between the mattress supporting the air bags and the bed body, and the mattress is deformed when serious, so that a user cannot obtain ideal supporting force and comfort level; in addition, the temperature of the air bag mattress is easily affected by the indoor temperature and the human body temperature, for example, the air in the air bag is difficult to release on the surface of the mattress, so that the temperature of the air bag mattress is easily affected by the air in the air bag to cause temperature fluctuation, and the temperature fluctuation is more obvious particularly in seasons with lower air temperature; for example, when a person sleeps, hot air or sweat is absorbed by the mattress, the mattress is easy to be moist and bacteria are easy to grow, and the health of the user is not utilized.

Disclosure of Invention

In order to solve the problems, the utility model provides the intelligent mattress for adjusting the sleeping posture of the whole human body, which not only can provide uniform and stable supporting force for the human body, but also can keep the constant temperature of the mattress body and improve the user experience.

The utility model provides the following technical scheme:

the intelligent mattress for adjusting the sleeping posture of the whole human body comprises a mattress body with an air pump, wherein a plurality of folding air bags distributed in a diamond lattice are arranged in the middle of the mattress body, a plurality of strip-shaped air bags are arranged on two sides of each folding air bag, and the folding air bags and the strip-shaped air bags are respectively communicated with the air pump;

the mattress body includes from top to bottom in proper order: the folding air bag comprises a first placement layer, a second placement layer and a fixing layer, wherein the folding air bag and the strip-shaped air bag penetrate through the first placement layer and are at least partially positioned in the second placement layer, the fixing layer is in a cross shape, and the overlapping position corresponds to the position of the folding air bag;

the heating layer is formed by carbon fiber heating wires and glass fiber cloth, the carbon fiber heating wires penetrate through the glass fiber cloth, a sucking disc is arranged on one side, away from the first arranging layer, of the second arranging layer, and the sucking discs are distributed on two sides of the fixing layer.

Optionally, the carbon fiber heating wire is arranged inside the glass fiber cloth in a way of bending back and forth in a U shape, and one end of the carbon fiber heating wire extends out from the edge of the glass fiber cloth.

Optionally, a plurality of folding gasbag and strip gasbag are linked together through the trachea respectively with the air pump, the trachea includes main trachea and a plurality of bronchus, be provided with pressure sensor on the bronchus, main trachea one end with the air pump is connected, and the other end is a plurality of the bronchus is connected, the bronchus is kept away from main tracheal one end is inserted respectively in folding gasbag and the strip gasbag.

Optionally, the fixing layer is disposed in the middle of the second placement layer, and is formed by a first fixing strap and a second fixing strap, where the first fixing strap and the second fixing strap are disposed in a crisscross manner, and overlapping positions of the first fixing strap and the second fixing strap correspond to positions of the folded airbag.

Optionally, a first through hole is formed in the middle of the first placement layer, the folding air bags are embedded in the first through hole, second through holes are formed in two sides of the first through hole, and the strip-shaped air bags are embedded in the second through holes;

the second placement layer is provided with a first groove at a position corresponding to the first through hole, a second groove is provided at a position corresponding to the second through hole, the folding air bag is at least partially positioned in the first groove, and the strip-shaped air bag is at least partially positioned in the second groove.

Optionally, the strip-shaped air bags comprise a head strip-shaped air bag, a neck strip-shaped air bag, a shoulder strip-shaped air bag and a leg strip-shaped air bag, wherein the head strip-shaped air bag, the neck strip-shaped air bag and the shoulder strip-shaped air bag are sequentially arranged on the bedside side of the mattress body along the length direction of the mattress body, and the leg strip-shaped air bag is arranged on the bedside side of the mattress body.

Optionally, the top that the second settled layer is close to the tailstock side is provided with first storage tank, the bottom that the first settled layer is close to the tailstock side is provided with the second storage tank, first storage tank with the second storage tank encloses into the accommodation chamber, the air pump sets up in the accommodation chamber.

Optionally, the second settled layer is kept away from first settled layer enclose all around and is equipped with dampproofing frame, be provided with in the dampproofing frame and follow mattress body width direction extension's dampproofing strip, dampproofing frame, dampproofing strip and sucking disc are located the coplanar.

Optionally, the top parts of the head strip-shaped air bags, the neck strip-shaped air bags and the shoulder strip-shaped air bags are respectively provided with a first raised line extending along the width direction of the mattress body;

the top of the leg strip-shaped air bag is provided with a second raised line extending along the length direction of the mattress body.

Optionally, the first placement layer is detachably connected with the second placement layer, the second placement layer is detachably connected with the fixing layer, the first fixing belt is detachably connected with the second fixing belt, and the heating layer is detachably connected with the first placement layer and the second placement layer respectively.

The beneficial effects that can be produced by the present utility model include, but are not limited to:

the intelligent whole-human sleeping posture adjusting mattress provided by the utility model is provided with the folding air bags, the head strip air bags, the neck strip air bags, the shoulder strip air bags and the leg strip air bags, and is corresponding to different parts of a human body, and the mattress is inflated or pumped to enable the human body to be in different heights so as to adapt to the normal physiological curve of the human body, be beneficial to the relaxation of the human body and improve the sleeping quality; by arranging the first placement layer, the second placement layer and the fixing layer, the shifting phenomenon can be effectively avoided, so that the firmness and reliability of the mattress structure are ensured; by arranging the heating layer, the mattress is ensured to be warm and comfortable, and meanwhile, the durability and the tensile strength of the mattress are enhanced; the sucking disc is arranged, so that the mattress is tightly attached to the bed body, and the mattress is prevented from shaking or moving; this full human appearance intelligent regulation mattress of sleeping not only provides even stable holding power for the human body, lasting constant temperature simultaneously, guarantees the comfort level and the health degree of mattress, promotes user experience.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:

fig. 1 is a schematic structural view of an intelligent mattress for adjusting sleeping posture of a whole human body according to an embodiment of the present utility model;

fig. 2 is a cross-sectional view of an intelligent mattress for adjusting sleeping posture of a whole human body according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a heat generating layer according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of another state of the intelligent mattress for adjusting sleeping posture of a whole human body according to the embodiment of the utility model;

FIG. 5 is a bottom view of the all-body sleep position intelligent adjustment mattress of FIG. 1;

list of parts and reference numerals:

1. folding gasbag, 2, the air pump, 3, first placement layer, 4, second placement layer, 5, the fixed layer, 6, the layer that generates heat, 7, carbon fiber heating wire, 8, glass fiber cloth, 9, the sucking disc, 10, main trachea, 11, bronchus, 12, pressure sensor, 13, first fixed band, 14, second fixed band, 15, first through-hole, 16, first recess, 17, the second through-hole, 18, the second recess, 19, head strip gasbag, 20, neck strip gasbag, 21, shoulder strip gasbag, 22, shank strip gasbag, 23, holding chamber, 24, dampproofing frame, 25, dampproofing strip, 26, first sand grip, 27, second sand grip.

Detailed Description

In order to more clearly illustrate the general inventive concept, a detailed description is given below by way of example with reference to the accompanying drawings.

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present utility model and features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

In addition, in the description of the present utility model, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The utility model provides an intelligent mattress for regulating sleeping posture of a whole human body, which is used for providing uniform and stable supporting force for the human body, keeping constant temperature for a long time and guaranteeing comfort and health of the mattress.

Referring to fig. 1-5, the embodiment provides an intelligent mattress for adjusting sleeping posture of a whole human body, which comprises a mattress body with an air pump 2, wherein the middle part of the mattress body is provided with a plurality of folding air bags 1 distributed in a diamond lattice manner, and the folding air bags are used for dispersing local pressure of the human body and the bed points of force and are beneficial to the relaxation of the human body; the two sides of the folding air bag 1 are provided with a plurality of strip-shaped air bags which are respectively used for supporting the head, neck, shoulders and legs of a human body, so that the comfort level of a user is further improved; the plurality of folding air bags 1 and the strip-shaped air bags are respectively communicated with the air pump 2, so that the folding air bags 1 and the strip-shaped air bags can be inflated or exhausted conveniently, and different supporting forces can be provided for all parts of a human body;

the mattress body includes from top to bottom in proper order: the first placement layer 3, the second placement layer 4 and the fixed layer 5, the folding air bags 1 and the strip-shaped air bags pass through the first placement layer 3 and are at least partially positioned in the second placement layer 4, so that the displacement phenomenon is effectively avoided, and the stability of the mattress structure is improved; the fixed layer 5 is in a cross shape, and the overlapping position corresponds to the position of the folding air bag 1, and the folding air bag 1 is arranged in the middle of the mattress body, so that the structure at the position is weak, and the fixed layer 5 can strengthen the structure at the position, so that the firmness and reliability of the mattress structure are ensured;

a heating layer 6 is arranged in each of the first setting layer 3 and the second setting layer 4, so that the mattress is ensured to be kept at constant temperature for a long time; the heating layer 6 is composed of a carbon fiber heating wire 7 and a glass fiber cloth 8, the carbon fiber heating wire 7 is arranged in the glass fiber cloth 8 in a penetrating way, so that the mattress is warm and comfortable, and the durability and the tensile strength of the mattress are enhanced; one side of the second placement layer 4 far away from the first placement layer 3 is provided with sucking discs 9, and the sucking discs 9 are distributed on two sides of the fixed layer 5, so that the mattress and the bed body are tightly attached, the mattress is prevented from shaking or moving, and the sleeping comfort level is improved.

It can be understood that the sucker 9 is a vacuum sucker, a film sucker or an air pump sucker, preferably a vacuum sucker, and has simple operation and strong adsorption force, does not need any screw or other fixing piece, and can avoid damaging the bed body.

Specifically, the carbon fiber heating wire 7 is arranged in the glass fiber cloth 8 in a U-shaped back and forth bending mode, so that the temperature of the mattress can be uniformly distributed, local overheating or supercooling is avoided, electric energy can be more efficiently converted into heat energy, pollutant emission is avoided, and the mattress is environment-friendly; in addition, the glass fiber cloth 8 has good electrical insulation performance and tensile strength, ensures safe and reliable heating process, and improves the structural strength of the first placement layer 3 and the second placement layer 4 at the same time, so that the mattress has better stability; one end of the carbon fiber heating wire 7 extends out of the edge of the glass fiber cloth 8, so that the carbon fiber heating wire is convenient to connect with a power supply, and the mattress is favorable for lasting constant temperature.

As an implementation mode, the folding airbags 1 and the strip airbags are respectively communicated with the air pump 2 through air pipes, the air pipes comprise a main air pipe 10 and a plurality of branch air pipes 11, and the branch air pipes 11 are provided with pressure sensors 12 for detecting the pressures in the folding airbags 1 and the strip airbags and transmitting signals to a processor in time so as to control the air pump 2 to make corresponding adjustment; one end of the main air pipe 10 is connected with the air pump 2, the other end is connected with a plurality of bronchi 11, and one end of the bronchi 11 far away from the main air pipe 10 is respectively inserted into the folding air bag 1 and the strip-shaped air bag, so that each folding air bag 1 and each strip-shaped air bag can be inflated and deflated independently.

As an embodiment, the fixing layer 5 is arranged in the middle of the second placement layer 4 and is composed of a first fixing belt 13 and a second fixing belt 14, the first fixing belt 13 and the second fixing belt 14 are arranged in a crisscross manner, the overlapping position of the first fixing belt 13 and the second fixing belt 14 corresponds to the position of the folding air bag 1, the mattress is prevented from moving or deforming in the using process, and the stability and the supporting force of the mattress are improved, so that the mattress is more firm and durable.

As an implementation manner, the middle part of the first placement layer 3 is provided with a first through hole 15, the position of the second placement layer 4 corresponding to the first through hole 15 is provided with a first groove 16, the folded airbag 1 is embedded in the first through hole 15 and is at least partially positioned in the first groove 16, so that the position of the folded airbag 1 is fixed, the displacement phenomenon is avoided, and the height of the folded airbag 1 is adjusted;

the two sides of the first through hole 15 are provided with second through holes 17, the position of the second placement layer 4 corresponding to the second through holes 17 is provided with second grooves 18, the strip-shaped air bags are embedded in the second through holes 17 and at least partially positioned in the second grooves 18, the positions of the strip-shaped air bags are fixed, the displacement phenomenon is avoided, and meanwhile, only the height of the strip-shaped air bags is adjusted.

As one embodiment, the strip-shaped air bags comprise a head strip-shaped air bag 19, a neck strip-shaped air bag 20, a shoulder strip-shaped air bag 21 and a leg strip-shaped air bag 22, wherein the head strip-shaped air bag 19, the neck strip-shaped air bag 20 and the shoulder strip-shaped air bag 21 are sequentially arranged on the bedside side of the mattress body along the length direction of the mattress body and are respectively used for supporting the head, the neck and the shoulder of a human body, protecting the neck of the human body and maintaining the normal physiological curve of the cervical vertebra of the human body and promoting the sleep of the human body; the leg strip-shaped air bags 22 are arranged on the bed tail side of the mattress body, can support legs and can massage the legs.

As an implementation mode, the top that the second settled layer 4 is close to the tailstock side is provided with first storage tank, and the bottom that the first settled layer 3 is close to the tailstock side is provided with the second storage tank, and first storage tank encloses into holding chamber 23 with the second storage tank, and air pump 2 sets up in holding chamber 23, reduces the interference that air pump 2 produced to the human body when using, effectively avoids the emergence of aversion phenomenon simultaneously, improves the structural stability of mattress.

As an implementation mode, the second placement layer 4 is far away from the periphery of the first placement layer 3 and is provided with a dampproof frame 24, a dampproof strip 25 extending along the width direction of the mattress body is arranged in the dampproof frame 24, the dampproof strip 25 and the sucking disc 9 are positioned in the same plane, so that the bottom of the mattress body is prevented from being in direct contact with the mattress body, excessive water vapor is absorbed, the phenomena of worm eating and mildew are caused, and the structural stability of the mattress is ensured.

As an implementation mode, the top parts of the head strip-shaped air bags 19, the neck strip-shaped air bags 20 and the shoulder strip-shaped air bags 21 are respectively provided with a first raised line 26 extending along the width direction of the mattress body, so that the friction force between a human body and the mattress is increased, and the head, the neck and the shoulders of the human body are prevented from sliding on the corresponding air bags at will;

the second raised strips 27 extending along the length direction of the mattress body are arranged at the top of the leg strip-shaped air bags 22, so that the massage effect on the legs of a human body can be achieved, and the comfort of the mattress is improved.

As an implementation mode, the first placement layer 3 is detachably connected with the second placement layer 4, the second placement layer 4 is detachably connected with the fixed layer 5, the first fixed belt 13 is detachably connected with the second fixed belt 14, the heating layer 6 is detachably connected with the first placement layer 3 and the second placement layer 4 respectively, and the mattress is convenient to disassemble, assemble and maintain while firm and reliable in structure.

Specifically, the first placement layer 3 and the second placement layer 4, the second placement layer 4 and the fixing layer 5, the first fixing belt 13 and the second fixing belt 14, the heating layer 6 and the first placement layer 3, and the heating layer 6 and the second placement layer 4 are detachably connected in a snap fastener or magic tape mode, so that the mattress is beneficial to cleaning and maintenance.

The working principle of the utility model is as follows:

firstly, fixing a mattress body on a bed body through a sucker 9; then, a human body lies on the mattress body, and whether the carbon fiber heating wire 7 is electrified or not and the electrifying duration are selected according to the temperature of the body; then, the air pump 2 is controlled by the processor to respectively inflate or deflate the folding air bag 1, the head strip air bag 19, the neck strip air bag 20, the shoulder strip air bag 21 and the leg strip air bag 22 so that the air bags are different in height and adapt to sleeping postures of a human body, and the pressure sensor 12 monitors the pressure in the air bags in real time and transmits signals to the processor in time so as to control the air pump 2 to make corresponding adjustment.

The utility model relates to circuits, electronic components and modules in the prior art, which can be completely realized by those skilled in the art, and needless to say, the protection of the utility model does not relate to the improvement of software and methods.

In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.

The foregoing is merely exemplary of the present utility model and is not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are to be included in the scope of the claims of the present utility model.

Claims

1. The intelligent sleeping posture adjusting mattress for the whole human body is characterized by comprising a mattress body with an air pump, wherein a plurality of folding air bags distributed in a diamond lattice are arranged in the middle of the mattress body, a plurality of strip-shaped air bags are arranged on two sides of each folding air bag, and the folding air bags and the strip-shaped air bags are respectively communicated with the air pump;

2. The intelligent sleeping posture adjusting mattress for the whole human body according to claim 1, wherein the carbon fiber heating wire is arranged in the glass fiber cloth in a U-shaped back and forth bending manner, and one end of the carbon fiber heating wire extends out from the edge of the glass fiber cloth.

3. The intelligent sleeping posture adjusting mattress for the whole human body according to claim 1, wherein a plurality of folding air bags and strip-shaped air bags are respectively communicated with the air pump through air pipes, each air pipe comprises a main air pipe and a plurality of branch air pipes, a pressure sensor is arranged on each branch air pipe, one end of each main air pipe is connected with the air pump, the other end of each main air pipe is connected with a plurality of branch air pipes, and one ends of the branch air pipes far away from the main air pipes are respectively inserted into the folding air bags and the strip-shaped air bags.

4. The intelligent sleeping posture adjusting mattress for the whole human body according to claim 1, wherein the fixing layer is arranged in the middle of the second placement layer and is composed of a first fixing belt and a second fixing belt, the first fixing belt and the second fixing belt are arranged in a crisscross manner, and the overlapping position of the first fixing belt and the second fixing belt corresponds to the position of the folding air bag.

5. The intelligent full-body sleeping posture adjusting mattress according to claim 1, wherein a first through hole is formed in the middle of the first placement layer, the folding air bags are embedded in the first through hole, second through holes are formed in two sides of the first through hole, and the strip-shaped air bags are embedded in the second through holes;

6. The full-body sleeping posture intelligent regulation mattress of claim 1, wherein the strip gasbag includes head strip gasbag, neck strip gasbag, shoulder strip gasbag and shank strip gasbag, head strip gasbag, neck strip gasbag and shoulder strip gasbag set gradually along the length direction of mattress body in the head of a bed side of mattress body, shank strip gasbag sets up in the tailstock side of mattress body.

7. The intelligent sleeping posture adjusting mattress for the whole human body according to claim 6, wherein a first accommodating groove is formed in the top of the second accommodating layer, which is close to the side of the bed tail, a second accommodating groove is formed in the bottom of the first accommodating layer, which is close to the side of the bed tail, and the first accommodating groove and the second accommodating groove enclose an accommodating cavity, and the air pump is arranged in the accommodating cavity.

8. The intelligent sleeping posture adjusting mattress for the whole human body according to claim 1, wherein the second placement layer is far away from the periphery of the first placement layer, a dampproof frame is arranged in the periphery of the second placement layer, a dampproof strip extending along the width direction of the mattress body is arranged in the dampproof frame, and the dampproof frame, the dampproof strip and the sucking disc are located in the same plane.

9. The intelligent all-human sleeping posture adjusting mattress according to claim 6, wherein the top parts of the head strip-shaped air bags, the neck strip-shaped air bags and the shoulder strip-shaped air bags are all provided with first raised strips extending along the width direction of the mattress body;

10. The intelligent full body sleeping position adjusting mattress of claim 4, wherein the first placement layer is detachably connected with the second placement layer, the second placement layer is detachably connected with the fixing layer, the first fixing belt is detachably connected with the second fixing belt, and the heating layer is detachably connected with the first placement layer and the second placement layer respectively.