Pillow core sleep comfort performance testing device

Abstract

This invention relates to the field of measurement. A pillow core sleep performance testing device includes a base and a frame. The frame includes a second crossbeam, on which a pressure sensor module is fixed. The pressure sensor module is connected via a connecting rod to a pressure head located below the second crossbeam. The top surface of the pressure head is smooth and flat, serving as a measuring surface in the horizontal direction. The lower part of the pressure head is a three-dimensional model of the back half of a human head, serving as a contact surface. The pressure head is hollow, and the contact surface has an array of through holes running through it. Two photosensitive elements are fixed within any one of the through holes, and these two photosensitive elements are connected in parallel for redundancy. A ring of downward-facing light signal sources surrounds the outer edge of the measuring surface. By detecting the arrangement of the obscured photosensitive elements, data on the pillow's coverage of the back half of the human head model is obtained. This invention can be used to test the sleep performance of a pillow core in its intact state.

Description

Technical Field

[0001] This invention relates to the field of testing, and more specifically to testing apparatus. Background Technology

[0002] The comfort of a pillow core directly impacts sleep quality, making its performance crucial, especially key indicators such as compression height, softness, support, and compression durability. Current pillow core testing primarily focuses on certain filling materials, such as removing the filling and testing it in a specific container, or cutting a sample to size based on methods used for comforter compression recovery. However, because pillow core performance is related to numerous factors, including the fabric, size, weight, type, structure, and shape of the filling, only testing and comparison in its intact state can objectively reflect its intrinsic quality. Currently, there are no industry or national standards, nor is there sufficient testing equipment for testing pillow cores in their intact state.

[0003] The head-wrapping ratio refers to the degree to which the head is covered, and it is one of the key indicators affecting sleep comfort. However, there are currently no industry or national standards, nor is there any testing equipment for testing pillow core wrapping data. Summary of the Invention

[0004] The purpose of this invention is to provide a pillow core sleep performance testing device for testing the sleep performance of a pillow core in its intact state.

[0005] The technical problem solved by this invention can be achieved by the following technical solutions:

[0006] A pillow core sleep performance testing device includes a base and a frame. The base is equipped with a support plate. The frame includes vertical columns fixed on both sides of the base, a first crossbeam fixedly connected to the top of the vertical columns, and a second crossbeam slidably connecting the two vertical columns. The second crossbeam is located below the first crossbeam. A pressure sensor module is fixed on the second crossbeam. The pressure sensor module is connected to a pressure head located below the second crossbeam via a connecting rod. The top surface of the pressure head is smooth and flat, serving as a measuring surface in the horizontal direction. The lower part of the pressure head is a three-dimensional model of the back half of a human head, serving as a contact surface.

[0007] The pressure head is hollow, and the contact surface has an array of through holes that penetrate both inside and outside. Each through hole is divided into multiple through hole groups according to its height. The height of each through hole in the same through hole group is the same, and the distance between two adjacent through holes is the same. The distance between two adjacent through hole groups is smaller as they are closer to the measuring surface. The distance between two adjacent through hole groups is smaller as they are closer to the measuring surface.

[0008] Two photosensitive elements are fixed inside any one of the through holes, and the two photosensitive elements are connected in parallel for redundancy; a ring of downward-emitting light signal sources is arranged around the outer edge of the measuring surface, with the illumination angle of the light signal sources pointing downward and converging towards the inside of the ring; the light signal from the light signal sources shines on the pillow to be tested and produces reflection, which is received by the photosensitive elements; after the pillow is pressed and sinks, some photosensitive elements are blocked and no longer receive light signals; by detecting the arrangement of the blocked photosensitive elements, the data on the coverage of the back half of the human head model by the pillow is obtained.

[0009] Innovations: 1. This invention can be used to test the sleep comfort performance of pillow cores in their intact state. 2. The contact surface of this invention adopts the shape of the back half of a human head, which can be used to test the coverage data of pillow cores in their intact state. 3. This invention adds a photosensitive element to the pressure head, which can adjust the placement of the pillow sample through the monitoring results of the photosensitive element, making the test position closer to the head cavity of the pillow. This solves the problem that existing testing devices rely entirely on manual experience to place the sample. In addition, it also solves the problem that the test position affects the test results when the hardness of the pillow filling is inconsistent in different areas. 4. This invention obtains the coverage data of the pillow on the back half of the human head model by detecting the arrangement of the obscured photosensitive element, rather than by manual observation or measurement of the coverage, which has the advantages of high accuracy and high efficiency.

[0010] Preferably, each photosensitive element is connected to a computer via an encoding circuit system. The computer runs an image software system containing a three-dimensional pressure head pattern to simulate the pressure head. The positions of the photosensitive elements on the three-dimensional pressure head pattern correspond one-to-one with the positions of the photosensitive elements on the pressure head. The computer associates the position information of the obscured photosensitive elements with the image software system and illuminates the corresponding photosensitive elements in the three-dimensional pressure head pattern. This invention uses a computer to detect the arrangement of obscured photosensitive elements in real time and dynamically adjusts the state of the photosensitive elements in the image software system, illuminating the obscured parts and de-illuminating the unobscured parts, thus facilitating the observation of the position and number of obscured photosensitive elements by the tester.

[0011] Preferably, the photosensitive element group located at the top layer among the photosensitive elements that did not detect a light signal is used as the calibration photosensitive element group. When more than one-quarter of the photosensitive elements in the calibration photosensitive element group detect a light signal, the image software system considers the pillow sample to be in an incorrect position and provides a prompt to move the pillow sample. The direction of movement of the pillow sample is the direction of the middle photosensitive element in the calibration photosensitive element group that detected a light signal. When less than one-quarter of the photosensitive elements in the calibration photosensitive element group detect a light signal, the image software system considers the pillow sample to be in a correct position.

[0012] Preferably, assuming the pillow sample is positioned correctly, the image software system calculates the pillow's coverage rate based on the surface area of ​​the indenter below the contour line where the different layers of photosensitive element groups are located, the surface area of ​​the contact surface, and the layer containing the highest-positioned photosensitive element among the photosensitive elements that did not detect a light signal, stored in the computer. The coverage rate is calculated as: surface area of ​​the indenter below the contour line where the calibration photosensitive element group is located / surface area of ​​the contact surface.

[0013] Preferably, the optical signal source includes a dome-shaped light guide plate, which comprises a horizontally positioned annular plate and a downwardly curved plate. The top edge of the curved plate is connected to the outer edge of the annular plate. The diameter of the curved plate decreases as it approaches the annular plate. The top of the annular plate and the curved plate is covered with a reflective layer facing downwards. Point light sources are embedded at equal intervals on the inner edge of the annular plate, and the bottom of the annular plate rests against the measuring surface. This invention optimizes the structure of the optical signal source, resulting in a more uniform light distribution and easier installation and fixation.

[0014] Preferably, the diameter of the through hole remains constant from the inside out and then gradually increases, thereby using the portion with a constant inner diameter to fix the tail of the photosensitive element, and using a flared structure on the outer side to accommodate the head of the photosensitive element. The inner wall of the flared opening is coated with a reflective coating. This invention optimizes the structure of the through hole, making it easier for light to reach the photosensitive element, thus making the feedback on the photosensitive element's occlusion more accurate, and consequently making the coverage calculation more accurate.

[0015] Preferably, the pillow core comfort performance testing device also includes a laser measurement system. The laser emitter of the laser measurement system is slidably connected to the side of the first crossbeam, with the light outlet of the laser emitter facing downwards. The laser measurement system is connected to a computer via an electronic control system. Although existing testing devices include a laser measurement system and use it to obtain the degree of deformation of the pillow sample under pressure, this invention selects a position for the laser emitter. On the one hand, this solves the problem of the laser emitter being blocked when the pillow completely covers the pressure head, and on the other hand, it can move along the first crossbeam to above the measuring surface or above the support plate. The difference in distance between these two points allows for the calculation of the sinking depth of the pillow sample under different pressures, thereby determining the softness or hardness of the pillow sample.

[0016] Preferably, the support plate has scale lines on two adjacent sides, with the scale value starting at 0 from the center of the side and increasing towards the sides. This helps testers determine the placement of the pillow.

[0017] Beneficial effects: This invention can be used to test the sleep comfort performance of pillow cores in their intact state. Attached Figure Description

[0018] Figure 1 This is a partial structural schematic diagram of the present invention. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with the accompanying drawings.

[0020] Reference Figure 1 The pillow core comfort performance testing device includes a base, frame, pressure head, pressure sensor module, laser measurement system, etc.

[0021] A support plate 4 is provided on the base. The top surface of the support plate 4 is smooth and flat, and it is horizontal in direction to place the pillow core sample during testing. The support plate 4 has through-holes 10 to facilitate the release of gas generated by the pillow core sample during testing. The vents are arranged in a matrix with equal spacing, preferably 20mm between adjacent vents, and the diameter of the vents is preferably 6mm. The size of the support plate is larger than the size of the pillow core sample to provide complete support. Both the base and the support plate are preferably made of rigid materials to ensure support and reduce deformation. Scale lines are provided on two adjacent sides of the support plate, with the scale value starting at 0 at the center of the side and increasing towards the sides. This helps the tester determine the placement of the pillow. Preferably, the 0 value is directly opposite the connecting rod.

[0022] The top surface of the pressure head is smooth and flat, serving as the measurement surface in the horizontal direction. The lower part of the pressure head is shaped like a three-dimensional model of the back half of a human head, serving as the contact surface. This simulates the contact surface between the head and the pillow when sleeping on one's back. The pressure head is made of rigid material to maintain its shape and reduce deformation. Photosensitive elements are arranged in a matrix on the contact surface. Where the pressure head is completely covered by the pillow, the photosensitive elements cannot detect light signals; where it is not covered, the photosensitive elements can detect light signals. Thus, the presence or absence of light signals detected by the photosensitive elements indicates whether the pressure head is covered by the pillow sample. Preferably, the pressure head is hollow, and the contact surface has a matrix of through holes that penetrate both internally and externally. The hollow pressure head has an array of through holes that penetrate both internally and externally on the contact surface. Each through hole is divided into multiple through hole groups according to its height. The height of each through hole in the same through hole group is the same, and the distance between two adjacent through holes is the same. The distance between two adjacent through hole groups is smaller as they get closer to the measurement surface. Two photosensitive elements are fixed within any one of the through holes, and these two photosensitive elements are connected in parallel for redundancy. When the pillow is pressed and sinks, some of the photosensitive elements are blocked and no longer receive light signals. By detecting the arrangement of the blocked photosensitive elements, the data on the pillow's coverage of the back half of the head model is obtained. The hollow part of the pressure head is used to accommodate the wires. The use of two photosensitive elements reduces the risk of misjudgment caused by a single photosensitive element. Further preferably, the diameter of the through hole remains constant from the inside out and then gradually increases. This uses the portion with a constant inner diameter to fix the tail of the photosensitive element, reducing its displacement. The flared structure on the outer side allows light to enter the through hole more easily, ensuring detection accuracy. A reflective coating is applied to the flared area to further facilitate light entry into the through hole and ensure detection accuracy. Preferably, the photosensitive elements are divided into multiple photosensitive element groups according to their height. Photosensitive elements within the same group have the same height, and the distance between adjacent photosensitive elements is the same; note that this distance is not a straight line distance but a distance along the outer contour. It is generally believed that the closer to the measurement surface, the greater the total length of the outer contour and the greater the distance between photosensitive elements. However, this overlooks the fact that the probability of the contour being completely obscured is lower. This invention increases the density of photosensitive elements at this location, which helps improve the measurement accuracy when the contour is obscured. Preferably, each photosensitive element is connected to a computer via an encoding circuit system. The computer runs an image software system, which contains a three-dimensional pressure head pattern 5 used to simulate the pressure head. The positions of the photosensitive elements on the three-dimensional pressure head pattern 5 correspond one-to-one with the positions of the photosensitive elements on the pressure head. The computer associates the position information of the obscured photosensitive elements with the image software system and illuminates the corresponding photosensitive elements in the three-dimensional pressure head pattern.This invention uses a computer to detect the arrangement of obscured photosensitive elements in real time and dynamically adjusts the state of the photosensitive elements in the image software system so that the obscured parts are lit up and the unobscured parts are not lit up, thus making it convenient for testers to observe the position and number of obscured photosensitive elements.

[0023] A ring of downward-facing light sources surrounds the outer edge of the measuring surface. The light sources are angled downwards and converge inwards. The light from these sources reflects off the pillow being tested and is received by the photosensitive element. This reduces interference from ambient light, such as weak light at the interface between the pillow and the sample due to light blocking from the pillow's side, leading to false detections by the photosensitive element—predicting a pillow as wrapped when it is not. The light sources are preferably angled downwards to better reach the photosensitive element, further improving measurement accuracy. The light source preferably includes a dome-shaped light guide plate, comprising a horizontally positioned annular plate and a downward-facing curved plate. The top edge of the curved plate connects to the outer edge of the annular plate, with the diameter of the curved plate decreasing as it approaches the annular plate. The top of the annular plate and the curved plate are covered with a reflective layer facing downwards. Point light sources are evenly spaced along the inner edge of the annular plate, guiding the light emitted from these point light sources downwards more evenly. The bottom of the annular plate rests against the measuring surface.

[0024] The frame includes vertical columns 3 fixed to both sides of the base, with the vertical columns 3 positioned vertically. It also includes a first crossbeam 1 and a second crossbeam 2 extending horizontally. The two ends of the first crossbeam 1 are connected to the tops of the two vertical columns, and the second crossbeam 2 is located below the first crossbeam 1, with its two ends slidably connected to the two vertical columns. This allows the second crossbeam 2 to move vertically. The frame also includes a drive motor that drives the second crossbeam 2 to move vertically along the vertical columns. The sliding connection structure and drive mechanism are existing technology and will not be described in detail here.

[0025] The pressure sensor module 7 is connected to the second crossbeam 2 at the top and to the pressure head 9 at the bottom via a connecting rod 8. The connecting rod 8 can be a fixed rod of fixed length or a telescopic rod of variable length. Using a telescopic rod increases the distance between the support plate of the pressure head and the pillow, making it easier to insert the pillow. The pressure sensor module is preferably fixedly connected to the second crossbeam 2, but it can also be slidably connected. Typically, the pressure sensor module includes a housing with a pressure sensor located on its upper part, with the measuring surface facing downwards. The end of the connecting rod has a hemispherical cap located inside the housing and can move up and down along the housing; the maximum outer diameter of the cap is larger than the outer diameter of the connecting rod. Normally, the measuring surface of a pressure sensor faces upwards, such as in a weighing scale. In this invention, the measuring surface faces downwards. Before the pressure head contacts the pillow, the pressure sensor module measures 0 pressure. Upon contact with the pillow, as the pressure head presses down, the measured pressure increases continuously. This opens up new application directions for pressure sensors. The end of the connecting rod of the present invention is provided with a hemispherical end cap, which can restrict the connecting rod from coming out of the housing, reduce the resistance when moving up and down, and concentrate the pressure at the top, thereby effectively touching the pressure sensor and making the detection result of the pressure sensor more accurate.

[0026] A pillow core sleep performance testing device also includes an electronic control system, which is connected to a drive motor, a pressure sensor module, and a laser measurement system. The electronic control system sets parameters such as pressure, displacement, and holding time according to test requirements, and drives the second crossbeam 2 and connecting rod to move the pressure head downwards, compressing the pillow core sample, thereby completing the testing process for different pillow core performance characteristics. The electronic control system is connected to a computer, which records and processes measurement data and issues test requirements through its storage system. The highest-level photosensitive element group among the photosensitive elements that did not detect a light signal is used as the calibration photosensitive element group. When more than one-quarter of the photosensitive elements in the calibration photosensitive element group detect a light signal, the image software system considers the pillow sample to be in an incorrect position and provides a prompt to move the pillow sample. The direction of movement of the pillow sample is the direction of the middle photosensitive element in the calibration photosensitive element group that detected a light signal; when less than one-quarter of the photosensitive elements in the calibration photosensitive element group detect a light signal, the image software system considers the pillow sample to be in a correct position. When the pillow sample is positioned correctly, the image software system calculates the pillow's coverage rate based on the surface area of ​​the indenter below the contour line of the different layers of photosensitive element groups stored in the computer, the surface area of ​​the contact surface, and the layer containing the highest photosensitive element among the photosensitive elements that did not detect a light signal. Coverage rate = surface area of ​​the indenter below the contour line of the calibration photosensitive element group / surface area of ​​the contact surface.

[0027] The laser emitter of the laser measurement system can be slidably connected to one of the vertical columns, facing the other. By sliding the laser emitter up and down, it can be aligned with the top surface of the pressure head, thus determining the position of the pressure head's top surface. This allows the distance from the top surface to the support plate to be obtained. Subtracting the distance from the top surface of the pressure head to its lowest point from the distance from the top surface to the support plate gives the distance the pillow core sample is compressed. Alternatively, the laser emitter can be connected to the first crossbeam, facing the top surface of the pressure head, similarly determining its position. Furthermore, compared to a structure fixed to a vertical column, this effectively avoids the problem of the pressure head's top surface being obscured when the sides of the pillow are higher than the pressure head.

[0028] This invention can be used to test the sleep comfort performance of pillow cores in their intact state. The following are tests conducted on the following indicators of the pillow samples.

[0029] Test Example 1: Pillow core compression height test using the testing device of this invention: After conditioned the pillow core sample in a constant temperature and humidity chamber for 24 hours, it was placed in the middle of the support plate. The computer preset the pressure to 36N. After clicking "start test," the computer controlled the pressure head to move downwards via the electronic control system. The pressure sensor module dynamically monitored and displayed the pressure value in real time. When the pressure value reached the preset pressure of 36N, the pressure head stopped moving and remained stable for 30 seconds. Then, the laser height measuring instrument began measurement, and the height difference between the measuring surface and the upper surface of the support plate was measured to be 16.7cm. Subtracting the height of the pressure head itself (12.2cm) from this height difference yielded a pillow core compression height of 4.5cm.

[0030] Test Example 2: The testing device of this invention was used to test the softness and support of the pillow core: After conditioned for 24 hours in a constant temperature and humidity chamber, the pillow core sample was placed in the middle of the support plate. The computer preset a low deformation rate of 30% and a high deformation rate of 60%. After clicking to start the test, the pressure head moved downward. After the pressure head began to contact the pillow core sample, the pressure sensor module began to monitor the pressure in real time. The laser height measuring instrument detected the initial height of the pillow core of 12cm (the height difference between the measuring surface and the upper surface of the support plate - the height of the pressure head) and fed it back to the control system. The control system quickly obtained the corresponding downward pressure heights of 3.6cm and 7.2cm for the low deformation rate of 30% and the high deformation rate of 60%, respectively, through program settings; and controlled the pressure head to continue moving downward to the corresponding downward pressure height. After maintaining stability for 30 seconds, the system recorded the pressure values ​​corresponding to the pressure sensor at that time as 21.2N and 48.7N, respectively. By conducting this test on a large number of pillow cores of different materials, standards for judging the softness and support of pillow cores can be gradually established, or they can be graded.

[0031] Test Example 3: The pillow core compression durability was tested using the testing device of this invention: After conditioned for 24 hours in a constant temperature and humidity chamber, the pillow core sample was placed in the middle of the support plate. The pressure value was preset to 36N via computer. After clicking "Start Test," the pressure head moved downwards. When it contacted the pillow core sample, the pressure sensor module dynamically monitored and displayed the pressure value in real time. When the pressure reached the preset pressure of 36N, the pressure head stopped moving and remained stable for 30 seconds. Then, the laser height measuring instrument measured the height between the upper surface of the pressure head and the upper surface of the support plate, which was 16.2cm. Subtracting the pressure head's own height of 12.2cm from this height, the initial compression height of the pillow core was obtained as 4cm. The preset pressure value was then adjusted to 65N via computer. After clicking "Start Test," the pressure head moved downwards. When it contacted the pillow core sample, the pressure sensor module dynamically monitored and displayed the pressure value in real time. When the pressure reached the preset value, the pressure head stopped moving and remained stable. The pillow core was kept under constant high-strength compression for 72 hours. During this process, as the pressure value monitored by the pressure sensor decreased due to the deformation and strain of the pillow core material, the system controlled the pressure head to move slowly downwards until the pressure value reached the preset value and remained constant. After 72 hours of compression, the system controlled the pressure head to move slowly upwards to release the pressure. The sample was removed and placed loosely on the test bench for 30 minutes to recover. The pillow core sample was then placed back in the middle of the support plate, and the pressure value was preset to 36N again via the computer. After clicking to start the test, the pressure head moved downwards. When it contacted the pillow core sample, the pressure sensor module could dynamically monitor and display the pressure value of the pressure head in real time. When the pressure value reached the preset pressure of 36N, the pressure head stopped moving and remained stable for 30 seconds. The laser height measuring instrument then measured the height between the upper surface of the pressure head and the upper surface of the support plate, which was 15.2cm. Subtracting the height of the pressure head itself, 12.2cm, from this height value yielded a compression height of 3cm. Comparing this value with the initial compression height of the pillow core, the compression height loss rate was calculated to be (4-3) / 4 = 25%. By conducting this test on a large number of pillow cores made of different materials, a standard for judging the compression durability of pillow cores can be gradually established, or a graded evaluation can be carried out.

[0032] Test Example 4: Pillow core wrapping test using the testing device of this invention: After conditioned the pillow core sample in a constant temperature and humidity chamber for 24 hours, it was placed in the middle of the support plate. The computer preset the pressure to 36N. After clicking "Start Test," the computer controlled the pressure head to move downwards via the electronic control system. The pressure sensor module dynamically monitored and displayed the pressure value in real time. When the pressure reached the preset pressure of 36N, the pressure head stopped moving and remained stable for 30 seconds. Then, the light signal source was activated, and the computer read the status (out of 30, 20 of which did not detect a light signal) and position of the photosensitive elements (five of the photosensitive elements on the left side of the highest layer of photosensitive elements that did not detect a light signal detected a light signal). When the monitoring results of photosensitive elements at the same height were different, it indicated that the pillow was not placed accurately. The pillow should be moved towards the side where a light signal was detected, ideally towards the photosensitive element in the middle where a light signal was detected. The computer prompted the user to move the pillow and controlled the pressure head to move upwards. The tester observed the position of the photosensitive elements on the computer, determined the direction and distance of movement, and then moved the pillow to the middle position. The test is restarted, and the computer controls the pressure head to move downwards via the electronic control system. The pressure sensor module dynamically monitors and displays the pressure value in real time. When the pressure reaches the preset pressure of 36N, the pressure head stops moving and remains stable for 30 seconds. Then, the light signal source is activated, and the computer reads the status (out of 30, 12 of which did not detect a light signal) and position (the photosensitive elements in the highest layer among those that did not detect a light signal were all not detecting a light signal). The computer considers the detection position correct, with a coverage rate of 70%. Coverage rate = surface area of ​​the contact surface below the contour line of the highest layer of the photosensitive elements that did not detect a light signal / surface area of ​​the contact surface. As long as the surface area below the contour line and the surface area of ​​the contact surface of each group of photosensitive elements are input into the computer beforehand, the computer can calculate the coverage rate automatically without manual calculation.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A pillow sleep performance testing device, comprising a base, a rack, a support plate provided on the base, vertical columns fixed on both sides of the base, a first cross beam fixed on the top of the vertical columns, a second cross beam slidingly connected to the vertical columns, the second cross beam being below the first cross beam, a pressure sensor module fixed on the second cross beam, and a pressure head connected to the pressure sensor module through a connecting rod, characterized in that: the top surface of the pressure head is smooth and flat, and serves as a measurement surface in the horizontal direction; the lower part of the pressure head is a three-dimensional model of the back half of a human head, serving as a contact surface. The pressure head is hollow, and an array of through holes is formed on the contact surface, the through holes being divided into groups according to their heights, the heights of the through holes in the same group being the same, and the distances between the through holes in the same group being the same; the distances between the through holes in adjacent groups decrease as they approach the measurement surface. Two photosensitive elements are fixed in each through hole, and the two photosensitive elements are connected in parallel. A light signal source is arranged around the outer edge of the measurement surface, and the light signal source emits light downward and converges inward. The light signal of the light signal source is reflected by the pillow to be detected, and the reflected light is received by the photosensitive elements.

2. The pillow sleep performance testing apparatus of claim 1, wherein, When the pillow is pressed, some photosensitive elements are blocked and no longer receive light.

3. The pillow sleep performance test device of claim 2, wherein, The arrangement of the blocked photosensitive elements is detected to obtain the coverage data of the pillow on the back half of the human head model.

4. The pillow sleep performance test device of claim 3, wherein, Each photosensitive element is connected to a computer through a coding circuit system, and an image software system is run on the computer, the image software system having a three-dimensional pressure head pattern simulating the pressure head, the positions of the photosensitive elements on the three-dimensional pressure head pattern corresponding to the positions of the photosensitive elements on the pressure head, the computer relating the position information of the blocked photosensitive elements to the image software system, and lighting the photosensitive elements at the corresponding positions in the three-dimensional pressure head pattern. The top group of photosensitive elements in the photosensitive elements that do not detect light is used as a calibration photosensitive element group, when more than one fourth of the photosensitive elements in the calibration photosensitive element group detect light, the image software system considers that the position of the pillow sample is incorrect, and gives a prompt to move the position of the pillow sample, the moving direction of the pillow sample being the direction of the middle one of the photosensitive elements that detect light in the calibration photosensitive element group; when less than one fourth of the photosensitive elements in the calibration photosensitive element group detect light, the image software system considers that the position of the pillow sample is correct. When the position of the pillow sample is correct, the image software system calculates the coverage rate of the pillow according to the surface area of the pressure head below the contour line of the top group of photosensitive elements, the surface area of the contact surface, and the layer of the top group of photosensitive elements that do not detect light, the coverage rate being the surface area of the pressure head below the contour line of the top group of photosensitive elements / the surface area of the contact surface.

5. The pillow sleep performance testing apparatus of any one of claims 1-4, wherein, The light signal source comprises a light guide plate in the shape of a cover, the light guide plate comprises a ring-shaped plate in the horizontal direction and a downwardly inclined curved plate, the top edge of the curved plate is connected to the outer edge of the ring-shaped plate, the aperture of the curved plate is smaller closer to the ring-shaped plate, the ring-shaped plate and the top of the curved plate are covered with a light-reflecting layer with the light-reflecting surface facing downward, point light sources are embedded on the inner edge of the ring-shaped plate at equal intervals, and the bottom of the ring-shaped plate abuts against the measurement surface.

6. The pillow sleep performance testing apparatus of any one of claims 1-4, wherein, The aperture of the through hole remains unchanged first and then gradually increases from the inside to the outside, so that the tail part of the photosensitive element is fixed by the part with unchanged inner diameter, and the head part of the photosensitive element is accommodated by the trumpet-shaped structure on the outer side, and the inner side wall of the trumpet is coated with a light-reflecting coating.

7. The pillow sleep performance testing apparatus of any one of claims 1-4, wherein, The laser measurement system is further provided, and a laser emitting head of the laser measurement system is fixed on the first cross beam and faces the measurement surface; the laser measurement system is connected to a computer through an electric control system.

8. The pillow sleep performance testing apparatus of any one of claims 1-4, wherein, The support plate is provided with scale lines on two adjacent edges, the scale values on the scale lines are 0 at the center of the edge, and the values are larger farther to the two sides.

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