Strain inspection device and manufacturing method thereof

Abstract

The present invention relates to a strain inspection device. A strain inspection device according to one aspect of the present invention may comprise: a fixing member which can be placed on a printed circuit board; a display member which is fixed to the printed circuit board by the fixing member and may crack or become damaged as the printed circuit board is deformed; and a conductive sensing member which is supported by the display member and provided so that the resistance changes as the display member cracks or becomes damaged.

Description

Strain test device and method for manufacturing the same

[0001] Cross-citation with related applications

[0002] This application claims the benefit of priority to Korean Patent Application Nos. 10-2024-0038603, 10-2024-0038671 and 10-2024-0038648, filed March 20, 2024, the entire contents of which are incorporated herein by reference.

[0003] Technology field

[0004] The present invention relates to a strain inspection device and a method for manufacturing the same, and more specifically, to a strain inspection device for inspecting strain applied to a printed circuit board and a method for manufacturing the same.

[0005] A printed circuit board (PCB) is a component used in various devices and equipment. Components or parts that perform specific functions can be mounted on a PCB. These components or parts can be connected and operated in a predetermined manner through circuits provided on the PCB. These components or parts may be IC chips, microcontroller units (MCUs), capacitors, or sensors that perform specific functions.

[0006] Printed circuit boards like these can be subject to external forces during the manufacturing process or during use. These external forces can deform and cause mechanical damage. Traditionally, strain gauges were used to measure mechanical damage to printed circuit boards. The mechanical damage measured by the strain gauge can be used to determine whether the printed circuit board is defective or damaged.

[0007] These conventional strain gauges are mounted on printed circuit boards and are configured to crack or break when the printed circuit board is deformed beyond a certain value. Operators or users measure mechanical damage to the printed circuit board based on the presence and / or extent of cracks or breakage in the strain gauges.

[0008] However, conventional strain gauges have limitations in accuracy and speed because users or operators must visually check for damage. This is because the ability to identify cracks or damage in strain gauges can vary depending on the operator's or operator's skill level. Furthermore, mechanical damage to a printed circuit board can only be measured when the operator or operator checks the strain gauge. Accordingly, there has been an urgent need to develop a strain sensing element capable of accurately and rapidly detecting strain applied to a printed circuit board, and a method for manufacturing the same.

[0009] The present invention has been devised to solve the above problems, and the object of the present invention is to provide a strain sensing element capable of accurately and quickly detecting strain applied to a printed circuit board and a method for manufacturing the same.

[0010] The tasks of the present invention are not limited to the tasks mentioned above, and other tasks not mentioned will be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0011] According to one aspect of the present invention, a strain test device is provided, comprising: a fixing member that can be placed on a printed circuit board; an indicator member that is fixed to the printed circuit board by the fixing member and that can be cracked or broken as the printed circuit board is deformed; and a conductive sensing member that is supported by the indicator member and whose resistance is designed to change as cracks or breaks occur in the indicator member.

[0012] At this time, the display member may extend in one direction, and the detection member may extend parallel to the display member.

[0013] At this time, the sensing member may be made of a metal wire.

[0014] At this time, the fixing member may be provided as a pair and positioned on each side of the extension direction of the display member.

[0015] At this time, the fixing member is made of a conductive material, and the sensing member can be electrically connected to each of the pair of fixing members.

[0016] At this time, the sensing member can pass through the display member.

[0017] At this time, the sensing member may be provided on the outer surface of the display member.

[0018] At this time, the display member may extend along one direction, and the detection member may be provided on a side extending parallel to the one direction.

[0019] At this time, the above-mentioned display member may have a block shape.

[0020] At this time, the fixing member may be provided on one side of the display member, and the detection member may be provided on the other side opposite to the one side.

[0021] At this time, the fixing member may be provided on one side of the display member, and the detection member may be provided on a border surface connected to the border side of the one side.

[0022] At this time, the detection member may be arranged to be broken when a crack or breakage occurs in the display member.

[0023] At this time, a crack guide pattern may be formed on one side of the above-mentioned display member.

[0024] At this time, the display member may have a block shape extending in one direction, and the crack guide pattern may be formed of a crack guide groove formed along the width direction of the display member.

[0025] At this time, the crack guide groove may be configured in multiple numbers and arranged along the length direction of the display member.

[0026] At this time, the detection member may be provided on the other surface of the display member.

[0027] At this time, the above-mentioned display member may be provided with a strength deformation portion.

[0028] At this time, the sensing member can be placed at a predetermined distance from the strength deformation part.

[0029] At this time, the sensing member can extend from one side of the display member to the other side by bypassing the strength deformation part.

[0030] At this time, the strength deformation portion may be formed as a groove or hole that is concavely sunken inward from the outer surface of the display member.

[0031] At this time, the cross-section of the above-mentioned strength deformation portion may have a rhombus shape.

[0032] At this time, a joining member interposed between the display member and the fixing member to join the display member and the fixing member may be further included.

[0033] At this time, the connecting member may be provided on one side of the display member, and the sensing member may be provided on the other side opposite to the one side.

[0034] At this time, the connecting member may be provided on one side of the display member, and the sensing member may be provided on a border surface connected to the border side of the one side.

[0035] At this time, the fixing member includes a first fixing member positioned on one side of the display member and made of a conductive material; and a second fixing member positioned on the other side of the display member and made of a conductive material, and the detection member can be electrically connected to each of the first fixing member and the second fixing member.

[0036] At this time, the connecting member includes a first connecting member interposed between the first fixing member and the display member; and a second connecting member interposed between the second fixing member and the display member, and the sensing member can be electrically connected to each of the first connecting member and the second connecting member.

[0037] At this time, the first connecting member covers a portion of the display member, the second connecting member covers another portion of the display member, and the one portion and the other portion of the display member can be positioned at a predetermined distance.

[0038] According to another aspect of the present invention, a method for manufacturing a strain test element is provided, comprising the steps of: providing an indicator member that can cause a crack or breakage when a predetermined deformation is applied; supporting the indicator member to the indicator member so that the resistance of the indicator member changes as the crack or breakage occurs in the indicator member; and combining a fixing member for fixing the indicator member to a printed circuit board on one side of the indicator member.

[0039] At this time, in the step of supporting the sensing member to the display member, the sensing member can be formed on the outer surface of the display member.

[0040] At this time, in the step of supporting the sensing member to the display member, a predetermined material can be deposited on the outer surface of the sensing member so that the sensing member is formed on the outer surface of the display member.

[0041] At this time, the above-mentioned material may include indium tin oxide.

[0042] At this time, a step of forming a strength deformation portion in the display member so that the strength of the display member can be deformed may be further included.

[0043] At this time, in the step of supporting the sensing member to the display member, the sensing member can be placed at a predetermined distance from the strength deformation part.

[0044] At this time, in the step of forming the strength deformation portion, the strength deformation portion may be formed on one surface of the display member, and in the step of supporting the detection member to the display member, the detection member may be formed on the other surface of the display member.

[0045] At this time, the step of forming a joining member on the outer surface of the marking member is further included before the step of joining the marking member and the fixing member, and in the step of joining the marking member and the fixing member, the joining member and the fixing member can be joined to fix the marking member to the fixing member.

[0046] At this time, in the step of forming the above-mentioned joining member, a metal thin film layer can be formed on the outer surface of the above-mentioned display member.

[0047] At this time, in the step of forming the connecting member, the step of forming a first connecting member on a part of the display member; and the step of forming a second connecting member on another part of the display member arranged at a predetermined distance from the part, and in the step of supporting the sensing member on the display member, the sensing member can be connected to the first connecting member and the second connecting member, respectively.

[0048] At this time, in the step of forming the connecting member, the connecting member may be formed on one side of the display member, and in the step of supporting the sensing member, the sensing member may be supported on the other side of the display member.

[0049] According to one aspect of the present invention, as a printed circuit board is deformed, a crack or breakage occurs in the display member, and when the crack or breakage occurs in the display member, the resistance of the detection member changes. Accordingly, by monitoring the resistance value of the detection member, whether the display member is cracked or broken can be accurately and quickly confirmed regardless of the skill level of the worker or user, so that the strain applied to the printed circuit board can be accurately and quickly inspected.

[0050] According to one aspect of the present invention, since the strength (or rigidity) of the display body can be controlled by the strength deformation portion, the magnitude of stress that causes cracks or breakage in the display member can be controlled. Accordingly, the magnitude of strain to be measured can be easily and conveniently controlled using the strain inspection device.

[0051] According to one aspect of the present invention, a bonding member is provided on the outer surface of the display member to increase the bonding force between the fixing member and the display member, so that the display member can be installed more stably and easily on a printed circuit board.

[0052] The effects of the present invention are not limited to the effects described above, and effects not mentioned can be clearly understood by a person having ordinary skill in the art to which the present invention pertains from this specification and the attached drawings.

[0053] FIG. 1 is an exemplary diagram showing a printed circuit board assembly and inspection process for explaining a strain inspection device according to an embodiment of the present invention.

[0054] Figure 2 is an exemplary diagram showing the arrangement of a strain inspection element according to an embodiment of the present invention.

[0055] FIG. 3 is a perspective view from above of a strain inspection element according to a first embodiment of the present invention installed on a printed circuit board.

[0056] Figure 4 is a cross-sectional view according to II of Figure 3.

[0057] FIG. 5 is a schematic diagram showing that deformation has occurred in the printed circuit board illustrated in FIG. 4, causing cracks or damage to the display member and the detection member.

[0058] Figure 6 is a plan view of the printed circuit board and strain test element shown in Figure 5 as viewed from above.

[0059] FIG. 7 is a perspective view from above of a strain inspection element according to a second embodiment of the present invention installed on a printed circuit board.

[0060] FIG. 8 is a perspective view from above of a strain inspection element according to a third embodiment of the present invention installed on a printed circuit board.

[0061] Fig. 9 is a perspective view from above of a strain test element according to a fourth embodiment of the present invention installed on a printed circuit board. At this time, the detection element provided within the display member is indicated by a dotted line.

[0062] Fig. 10 is a cross-sectional view according to II-II of Fig. 9.

[0063] FIG. 11 is a perspective view from above of a strain inspection element according to a fifth embodiment of the present invention installed on a printed circuit board.

[0064] Fig. 12 is a cross-sectional view according to Ⅲ-Ⅲ of Fig. 11.

[0065] Figure 13 is a schematic diagram showing that deformation has occurred in the printed circuit board illustrated in Figure 12, causing cracks or damage to the display member and the detection member.

[0066] Fig. 14 is a plan view of the printed circuit board and strain test element shown in Fig. 13 as viewed from above.

[0067] FIG. 15 is a perspective view from above of a strain inspection element according to a sixth embodiment of the present invention installed on a printed circuit board.

[0068] Fig. 16 is a perspective view from above of a strain inspection element according to the seventh embodiment of the present invention installed on a printed circuit board.

[0069] Fig. 17 is a perspective view from above of a strain test element according to the eighth embodiment of the present invention installed on a printed circuit board. At this time, the detection member provided within the display member is indicated by a dotted line.

[0070] Fig. 18 is a cross-sectional view according to Ⅳ-Ⅳ of Fig. 17.

[0071] FIG. 19 is a perspective view from above of a strain inspection element according to a ninth embodiment of the present invention installed on a printed circuit board.

[0072] Fig. 20 is a cross-sectional view according to V-V of Fig. 19.

[0073] Figure 21 is a schematic diagram showing that deformation has occurred in the printed circuit board illustrated in Figure 20, causing cracks or damage to the display member and the detection member.

[0074] FIG. 22 is a perspective view from above of a strain inspection element according to the tenth embodiment of the present invention installed on a printed circuit board.

[0075] Fig. 23 is a perspective view from above of a strain test element according to the eleventh embodiment of the present invention installed on a printed circuit board. At this time, the detection element provided within the display member is indicated by a dotted line.

[0076] Fig. 24 is a cross-sectional view taken along line VI-VI of Fig. 23.

[0077] Fig. 25 is an exploded perspective view of a strain test element according to the 12th embodiment of the present invention.

[0078] Fig. 26 is a vertical cross-sectional view showing a state in which a strain inspection element according to the 12th embodiment of the present invention is installed on a printed circuit board.

[0079] Figure 27 is a flowchart schematically showing a method for manufacturing a strain inspection element according to the first embodiment of the present invention.

[0080] Figure 28 is a flowchart schematically showing a method for manufacturing a strain inspection element according to a second embodiment of the present invention.

[0081] Figure 29 is a flowchart schematically illustrating a method for manufacturing a strain inspection element according to a third embodiment of the present invention.

[0082] Preferred embodiments of the present invention are described in detail so that those skilled in the art can easily implement them. However, the present invention may be implemented in various different forms and is not limited or restricted by the following examples.

[0083] In order to clearly explain the present invention, a detailed description of a part that is irrelevant to the description or a related known technology that may unnecessarily obscure the gist of the present invention has been omitted, and when adding reference signs to components of each drawing in this specification, the same or similar reference signs are attached to the same or similar components throughout the specification.

[0084] In addition, terms and words used in this specification and claims should not be interpreted as limited to their usual or dictionary meanings, but should be interpreted as meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to explain his or her own invention in the best way.

[0085] FIG. 1 is an exemplary diagram illustrating a printed circuit board assembly and inspection process for explaining a strain inspection element according to an embodiment of the present invention. FIG. 2 is an exemplary diagram illustrating the arrangement of a strain inspection element according to an embodiment of the present invention.

[0086] As illustrated in Fig. 1, a printed circuit board (B) may undergo an inspection process during the assembly process (or after assembly is completed) through several steps. During this process, the circuit pattern of the printed circuit board (B) and / or the components or parts coupled to the printed circuit board (B) may be damaged due to external force applied to the printed circuit board (B).

[0087] During the assembly process of the printed circuit board (B), the above-mentioned components or parts are mounted on the printed circuit board (B) or inserted into through holes formed in the printed circuit board (B). At this time, a worker or a work device applies pressure to the printed circuit board (B) to place the above-mentioned components or parts in the correct positions on the printed circuit board (B).

[0088] During such a manufacturing process, the printed circuit board (B) may be subjected to repeated force and may be bent, and the degree of such bending (strain) may cause the circuit pattern of the printed circuit board (B) and other components or parts connected to the printed circuit board (B) to be damaged.

[0089] In order to measure mechanical damage applied to a printed circuit board (B), a strain inspection element (1) according to an embodiment of the present invention can be used. The strain inspection element (1) according to an embodiment of the present invention is provided on the printed circuit board (B) and can accurately and quickly detect the strain applied thereto.

[0090] As illustrated in FIG. 2, a plurality of strain inspection elements (1) according to an embodiment of the present invention can be placed at a location where the greatest external force is applied on a printed circuit board (B) being manufactured.

[0091] For example, in order to mass-produce small-area printed circuit boards (B), after manufacturing a large-area printed circuit board (B), a cutting device (C) is used to cut the large-area printed circuit board, thereby manufacturing small-area printed circuit boards.

[0092] At this time, the portion adjacent to the cutting line (L) where the printed circuit board (B) is cut may be the portion where the warpage of the printed circuit board (B) is greatest. Taking this into consideration, multiple strain inspection elements (1) may be arranged along the cutting line (L).

[0093] Hereinafter, a strain inspection device according to a first embodiment of the present invention will be specifically described with different drawings.

[0094] Fig. 3 is a perspective view from above of a strain test element according to a first embodiment of the present invention installed on a printed circuit board. Fig. 4 is a cross-sectional view according to II of Fig. 3. Fig. 5 is a schematic diagram showing that deformation has occurred in the printed circuit board illustrated in Fig. 4, causing cracks or damage to the display member and the detection member.

[0095] FIGS. 3 and 4 disclose a strain test element (1) according to a first embodiment of the present invention. Referring to FIGS. 3 and 4, the strain test element (1) according to the first embodiment of the present invention may include a fixing member (10).

[0096] In this embodiment, the fixing member (10) may be a member for fixing the display member (20) described below to the printed circuit board (B). The fixing member (10) may be provided to contact the lower surface (24) of the display member (20). In other words, the fixing member (10) may be interposed between the lower surface (24) of the display member (20) and the printed circuit board (B) to fix them to each other.

[0097] At this time, the fixing member (10) and the display member (20) can be fixed (or, coupled) to each other via a joining member (40) described later. For example, the fixing member (10) can be a soldering member (e.g., a solder pad) for reflow soldering, and the joining member (40) can include a metal layer for soldering.

[0098] At this time, the fixing members (10) may be configured as a pair and may be spaced apart from each other at a predetermined distance in the front-back direction (Y-axis direction). The pair of fixing members (10) spaced apart from each other may be provided on each of the opposite sides of the display member (20). Here, the opposite sides of the display member (20) may be opposite sides in the extension direction (or, length direction) (Y-axis direction) of the display member (20). Accordingly, the pair of fixing members (10) may stably and balancedly fix the display member (20).

[0099] In this embodiment, the fixing member (10) may be conductive. The fixing member (10) may include at least one of lead (Pb), copper (Cu), aluminum (Al), and silver (Ag), but is not limited thereto.

[0100] At this time, the conductive fixing member (10) can be connected to a circuit formed on the printed circuit board (B). Accordingly, information regarding the resistance applied to the fixing member (10) or the current and / or voltage flowing through the fixing member (10) can be transmitted to other elements or components coupled to the printed circuit board (B). Using this, the strain applied to the printed circuit board (B) can be measured. This will be described in detail with reference to FIG. 5.

[0101] Referring to FIGS. 3 and 4, the strain inspection element (1) according to the first embodiment of the present invention may include a display member (20). The display member (20) may be a member for externally displaying information regarding strain applied to a printed circuit board (B). To this end, the display member (20) may be configured to cause a crack or breakage when a predetermined deformation (bending, deflection, strain) is applied to the printed circuit board (B).

[0102] In this embodiment, when the printed circuit board (B) is deformed, stress is also applied to the display member (20) fixed to the printed circuit board (B) by the fixing member (10), so that cracks or damage may occur in the display member (20). The material of such display member (20) may include at least one of glass, silicon wafer, gypsum, and plastic, but is not limited thereto.

[0103] As previously described, the display member (20) can externally display the strain applied to the printed circuit board (B) through cracks or breakage. By checking the presence and / or extent of cracks or breakage of the display member (20), a worker or user can predict the strain and mechanical damage applied to the printed circuit board (B).

[0104] In this embodiment, the shape and material of the indicator member (20) can be appropriately selected depending on the size of the strain to be detected.

[0105] As an example, as illustrated, the display member (20) may have a block shape extending in the front-back direction (Y-axis direction). The display member (20) may have a predetermined length in the front-back direction (Y-axis direction). The display member (20) may have a predetermined thickness in the up-down direction (Z-axis direction). The display member (20) may have a predetermined width in the left-right direction (X-axis direction). The stress applied to the display member (20) may be proportional to the length of the display member (20) and inversely proportional to the width of the display member (20).

[0106] For example, the length may be 4 to 6 mm, the thickness may be 80 to 150 μm, the width may be 1 to 3 mm, and the material of the display member (20) may include glass, but is not limited thereto.

[0107] In this embodiment, the upper portion of the display member (20) may be provided with an upper surface (22) extending along the front-back direction (Y-axis direction), and the lower portion may be provided with a lower surface (24) extending along the front-back direction (Y-axis direction).

[0108] In this embodiment, the upper surface (22) and the lower surface (24) may have a predetermined length along the front-back direction (Y-axis direction). The upper surface (22) and the lower surface (24) may have a predetermined width in the left-right direction (X-axis direction). The upper surface (22) and the lower surface (24) may face each other in the up-down direction (Z-axis direction).

[0109] In this embodiment, the lower surface (24) may be arranged to face the printed circuit board (B). At this time, the lower surface (24) may be provided with fixing members (10) so as to be respectively contacted. A pair of fixing members (10) may be respectively provided on one part and another part of the lower surface (24). At this time, the one part and the other part may be parts of the lower surface (24) arranged at a predetermined distance from each other in the longitudinal direction (Y-axis direction) of the display member (20).

[0110] In this embodiment, the front and rear of the display member (20) may each be provided with an end surface (28). The end surface (28) may be formed in the thickness direction (Z-axis direction) of the display member (20). The end surface (28) may have a predetermined width in the left-right direction (X-axis direction).

[0111] In the present embodiment, the left and right sides of the display member (20) may each be provided with a border surface (26). The border surface (26) may be connected to the left and right borders of the upper surface (22) and the lower surface (24), respectively. The border surface (26) may be formed in the thickness direction (Z-axis direction) of the display member (20). The border surface (26) may extend along the front-back direction (Y-axis direction), which is the extension direction of the display member (20).

[0112] Meanwhile, in the present embodiment, the display member (20) has been described as having a block shape formed of a rectangular parallelepiped. However, the shape of the display member (20) may be appropriately modified as needed, taking into consideration the size of the strain to be inspected, the space in which the display member (20) is installed, or the shape of the printed circuit board (B). For example, the display member (20) may have a shape in which at least one portion is bent.

[0113] Referring to FIGS. 3 and 4, the strain inspection element (1) according to the first embodiment of the present invention may include a sensing member (30). The sensing member (30) may be a member for quickly and accurately detecting strain applied to a printed circuit board (B).

[0114] In this embodiment, the sensing member (30) may be made of a conductive material. In addition, the sensing member (30) may be supported by the indicating member (20) so that the resistance may change as cracks or damage occur in the indicating member (20).

[0115] This may be to detect the strain based on a change in resistance applied to the sensing member (30). As an example, the sensing member may be made of, but is not limited to, aluminum (Al), titanium (Ti), tungsten (W), indium tin oxide (ITO), etc.

[0116] In this embodiment, the sensing member (30) may extend along the forward-backward direction (Y-axis direction), which is the extension direction of the display member (20). As an example, the sensing member (30) may be formed of a metal line extending in the forward-backward direction (Y-axis direction), but is not limited thereto.

[0117] In the present embodiment, the sensing member (30) may be provided on the upper surface (22) of the display member (20). As an example, the sensing member (30) may be attached to the upper surface (22). As another example, the sensing member (30) may be formed by being deposited on the upper surface (22). The method by which the sensing member (30) is formed is not particularly limited. In this case, the sensing member (30) may be formed so as not to have any possible effect on the stress value that causes cracks or breakage in the display member (20).

[0118] Meanwhile, in the present embodiment, the sensing member (30) may be electrically connected to a pair of fixing members (20) made of a conductive material, respectively. Although not specifically illustrated, one side of the sensing member (30) in the extension direction may be electrically connected to one of the pair of fixing members (20), and the other side of the extension direction may be electrically connected to the other of the pair of fixing members (20).

[0119] This configuration may be intended to accurately and quickly detect strain applied to the printed circuit board (B) using other elements or components mounted on the printed circuit board (B). This will be described in detail with reference to Fig. 5.

[0120] Referring to FIGS. 3 and 4, the strain test element (1) according to the first embodiment of the present invention may include a joining member (40). The joining member (40) may be a member for joining (or joining) the display member (20) and the fixing member (10) to each other. In other words, the display member (20) may be joined (or joined) to the fixing member (10) via the joining member (40). The joining member (40) may be formed of a metal layer for soldering.

[0121] In this embodiment, the bonding member (40) can expand the scope of application of the strain inspection element (1). For example, when the display member (10) is attached to the printed circuit board (B) using an acrylic adhesive, strain measurement is impossible at temperatures above 80 degrees. This is because the heat-resistant temperature of the acrylic adhesive is 80 degrees.

[0122] However, when the display member (20) is installed on the printed circuit board (B) by soldering via the joining member (40) as in the present embodiment, the strain applied to the printed circuit board (B) can be accurately and quickly detected even in high-temperature processes that cause heat damage, such as a thermal compression process or a thermal cycle test. Furthermore, the display member (20) can be easily installed on the printed circuit board (B) by the joining member (40).

[0123] In the present embodiment, the connecting member (40) may be provided in the left and right regions of the lower surface (24) of the display member (20), respectively. In addition, the connecting member (40) may not be provided in the central region located between the left and right regions of the lower surface (24) of the display member (20). Of course, the connecting member (40) may be provided entirely on the lower surface (24) of the display member (20), if necessary.

[0124] In this embodiment, the bonding member (40) may be formed of multiple metal layers. For example, the bonding member (40) includes a titanium (Ti) thin film layer (31) formed on the lower surface (24) of the display member (20), a copper (Cu) thin film layer (32) formed on the titanium thin film layer (31), a nickel (Ni) thin film layer (33) formed on the copper thin film layer (32), and a gold (Au) thin film layer (34) formed on the nickel thin film layer (33).

[0125] Here, the titanium thin film layer can function as a seed material that increases the bonding strength between the display member (20) made of glass and the copper thin film layer. For example, the thickness of the gold thin film layer can be 0.05 um, the thickness of the nickel thin film layer can be 0.2 um, the thickness of the copper thin film layer can be 0.5 um, and the thickness of the titanium thin film layer can be 0.04 um, but is not limited thereto.

[0126] Hereinafter, a process of checking strain applied to a printed circuit board by a strain sensing element according to the first embodiment of the present invention is briefly described.

[0127] Referring to FIGS. 4 and 5, when a predetermined external force (F) is applied to a printed circuit board (B) equipped with a strain inspection element (1) according to the first embodiment of the present invention, a strain is applied to the printed circuit board (B) and the printed circuit board (B) may be deformed. For example, as illustrated in FIG. 5, the printed circuit board (B) may be bent in the vertical direction (Z-axis direction).

[0128] As the printed circuit board (B) bends, a predetermined deformation may occur and stress may be applied to the display member (20) fixed to the printed circuit board (B) by the fixing member (10). Similarly, a predetermined deformation may occur and stress may be applied to the detection member (30) supported by the display member (20).

[0129] At this time, when the strain applied to the printed circuit board (B) reaches a predetermined value, a crack or breakage (A) may occur in the display member (20). The crack or breakage (A) that occurs in the display member (20) can be used by a worker or user to predict the strain or mechanical damage applied to the printed circuit board (B).

[0130] In addition, cracks or breakage (A) may occur in the detection member (30) supported by the display member (20). Accordingly, the resistance value of the detection member (30) may change.

[0131] As an example, the sensing member (30) may be broken by the crack or breakage (A). As a result, the resistance value of the sensing member (30) may increase infinitely. As another example, even if the sensing member (30) is not broken, the resistance value of the sensing member (30) may change by deformation due to the crack or breakage (A).

[0132] The resistance change value or degree of resistance change of the detection member (30) can be varied as needed, taking into consideration the shape of the printed circuit board (B), the installation position or material of the display member (20), etc.

[0133] The change in resistance of this sensing element (30) can be measured by various methods or devices.

[0134] As an example, since the test terminals of the measuring device are electrically connected to each of the two sides of the sensing member (30) in the extension direction, the change in resistance of the sensing member (30) can be accurately and quickly measured.

[0135] As another example, the change in resistance of the sensing member (30) can be measured by another element or component mounted on the printed circuit board (B). More specifically, a pair of fixing members (10) can be made of a conductive material, and both extending sides of the sensing member (30) can be electrically connected to the pair of fixing members (10), respectively. In addition, the element or component can be electrically connected to the pair of fixing members (10) through the circuit pattern of the printed circuit board (B). The element or component can accurately and quickly measure the change in resistance of the sensing member (30).

[0136] In this way, when the resistance of the detection member (30) changes infinitely or reaches a predetermined reference value or reference range, it can be determined that a strain corresponding to a crack or breakage of the display member (20) has been applied to the printed circuit board (B). Here, the reference value or reference range can be obtained in advance through experiments, etc.

[0137] As described above, the strain inspection element (1) according to the first embodiment of the present invention is configured to detect strain applied to a printed circuit board (B) by utilizing a change in the resistance value of the detection member (30), and thus the strain can be accurately and quickly measured.

[0138] Because, in this embodiment, the strain is determined from physical data such as a change in resistance of the sensing member (30), it can be measured regardless of the skill of the user or worker, and also, because the resistance value of the sensing member (30) changes immediately when strain is applied to the printed circuit board (B), the strain can be quickly detected.

[0139] Hereinafter, a strain test device according to another embodiment of the present invention is described using different drawings.

[0140] Fig. 6 is a perspective view from above showing a strain test element according to a second embodiment of the present invention installed on a printed circuit board. Fig. 7 is a perspective view from above showing a strain test element according to a third embodiment of the present invention installed on a printed circuit board. At this time, the detection member provided in the display member is indicated by a dotted line. Fig. 8 is a cross-sectional view taken along line II-II of Fig. 7. Fig. 9 is an exploded perspective view of a strain test element according to a fourth embodiment of the present invention. Fig. 10 is a vertical cross-sectional view showing a state in which a strain test element according to a fourth embodiment of the present invention is installed on a printed circuit board.

[0141] Fig. 11 is a perspective view of a strain test element according to a fifth embodiment of the present invention installed on a printed circuit board, as viewed from above. Fig. 12 is a cross-sectional view taken along line III-III of Fig. 11. Fig. 13 is a schematic diagram showing that deformation occurs in the printed circuit board illustrated in Fig. 12, causing cracks or damage to the display member and the detection member. Fig. 14 is a plan view of the printed circuit board and the strain test element illustrated in Fig. 13, as viewed from above. Fig. 15 is a perspective view of a strain test element according to a sixth embodiment of the present invention installed on a printed circuit board, as viewed from above. Fig. 16 is a perspective view of a strain test element according to a seventh embodiment of the present invention installed on a printed circuit board, as viewed from above. Fig. 17 is a perspective view of a strain test element according to an eighth embodiment of the present invention installed on a printed circuit board, as viewed from above. At this time, the sensing member provided in the display member is indicated by a dotted line. Fig. 18 is a cross-sectional view taken along IV-IV of Fig. 17. Fig. 19 is a perspective view taken along V-V of Fig. 19, which is a top view of a strain test element according to a ninth embodiment of the present invention installed on a printed circuit board. Fig. 20 is a cross-sectional view taken along V-V of Fig. 19. Fig. 21 is a schematic diagram showing that a deformation occurs in the printed circuit board shown in Fig. 20, causing cracks or damage to the display member and the sensing member. Fig. 22 is a top view of a strain test element according to a tenth embodiment of the present invention installed on a printed circuit board. Fig. 23 is a top view of a strain test element according to an eleventh embodiment of the present invention installed on a printed circuit board. At this time, the sensing member provided in the display member is indicated by a dotted line. Fig. 24 is a cross-sectional view taken along line VI-VI of Fig. 23. Fig. 25 is an exploded perspective view of a strain test element according to the 12th embodiment of the present invention. Fig. 26 is a vertical cross-sectional view showing a state in which a strain test element according to the 12th embodiment of the present invention is installed on a printed circuit board.

[0142] Fig. 6 discloses a strain test element (101) according to a second embodiment of the present invention. Referring to Fig. 6, the sensing member (130) of the strain test element (101) according to the second embodiment of the present invention can be supported on the edge surface (26) of the display member (20).

[0143] As an example, the sensing member (130) may be attached or coupled to the edge surface (26). As another example, the sensing member (130) may be formed on the edge surface (26) through a deposition process. The method of forming the sensing member (130) is not particularly limited.

[0144] The position of the sensing member (130) may be to minimize the influence on the strength of the display member (20). This is because the border surface (26) has a relatively large relationship with the thickness of the display member (20), and the upper surface (22) or lower surface (24) has a relatively large relationship with the length or width of the display member (20), and the bending strength (or stiffness) of the display member (20) has a large relationship with the length and width rather than the thickness of the display member (20).

[0145] FIGS. 7 and 8 disclose a strain inspection element (201) according to a third embodiment of the present invention. Referring to FIGS. 7 and 8, the sensing member (230) of the strain inspection element (201) according to the third embodiment of the present invention may be provided inside the display member (20).

[0146] In other words, in the present embodiment, the sensing member (230) may be extended to pass through the display member (20). As illustrated, the sensing member (230) may extend to pass through the interior of the display member (20) in the longitudinal direction (Y-axis direction) of the display member (20). Accordingly, the sensing member (230) may be protected from external contamination or impact by the display member (20).

[0147] Furthermore, in the present embodiment, since the sensing member (230) is surrounded by the display member (20), the sensing member (230) can be affected by cracks or breakage of the display member (20) in various directions. This allows the sensing member (230) to react more sensitively to cracks or breakage of the display member (20) and change its resistance value, thereby increasing the accuracy and speed of the strain test device (201).

[0148] FIGS. 9 and 10 disclose a strain test element (301) according to a fourth embodiment of the present invention. The fixing member (110) of the strain test element (301) according to the fourth embodiment of the present invention may include a first fixing member (112) and a second fixing member (114), and the coupling member (140) may include a first coupling member (142) and a second coupling member (144).

[0149] In the present embodiment, the first coupling member (142) may be provided on one side of the display member (20), and the second coupling member (144) may be provided on the other side of the display member (20). As illustrated, the first coupling member (142) may be provided on one part of the lower surface (24), and the second coupling member (144) may be provided on the other part of the lower surface (24). At this time, the first coupling member (142) and the second coupling member (144) may be spaced apart from each other by a predetermined distance in the extension direction (Y-axis direction) of the display member (20).

[0150] In this embodiment, the first coupling member (142) can be coupled with the first fixing member (112), and the second coupling member (144) can be coupled with the second fixing member (114). At this time, the coupling can be performed by a soldering process as described above. In this case, the first coupling member (142) and the first fixing member (112) can be electrically connected to each other, and the second coupling member (144) and the second fixing member (114) can be electrically connected to each other.

[0151] In this embodiment, the sensing member (330) can electrically connect the first coupling member (142) and the second coupling member (144). For example, the sensing member (330) can be provided on the lower surface (24) of the display member (20).

[0152] In the present embodiment, one side of the sensing member (330) may be coupled or connected to the first connecting member (142), and the other side may be coupled or connected to the second connecting member (144). In addition, at least a part (or a section) of the sensing member (330) may extend along the extension direction (Y-axis direction) of the indicator member (20). The shape or position of the sensing member (330) is not particularly limited as long as it can connect the first connecting member (142) and the second connecting member (144), while allowing resistance to change due to breakage or cracking of the indicator member (20).

[0153] By this configuration, the strain inspection element (301) according to the present embodiment is mounted on the printed circuit board (B), and can measure the strain applied to the printed circuit board (B) by utilizing another element or component electrically connected to the fixing member (110). This is because the element or component can indirectly measure the resistance change of the detection member (330) based on the resistance change between the first fixing member (112) and the second fixing member (114).

[0154] FIGS. 11 and 14 disclose a strain test element (401) according to a fifth embodiment of the present invention. Referring to FIGS. 11 and 14, the strain test element (401) according to the fifth embodiment of the present invention may include a fixing member (10). At this time, the fixing member (10) may be configured in the same manner as the fixing member (10) according to the first embodiment of the present invention described above.

[0155] Specifically, in the present embodiment, the fixing member (10) may be a member for fixing the display body part (21) of the display member (420) described below to the printed circuit board (B). The fixing member (10) may be provided to contact the lower surface (24) of the display body part (21). In other words, the fixing member (10) may be interposed between the lower surface (24) of the display body part (21) and the printed circuit board (B) to fix them to each other.

[0156] At this time, the fixing members (10) may be configured as a pair and may be spaced apart from each other at a predetermined distance in the front-back direction (Y-axis direction). A pair of fixing members (10) spaced apart from each other may be provided on each of the opposite sides of the display body part (21). Here, the opposite sides of the display body part (21) may be opposite sides in the extension direction (or, length direction) (Y-axis direction) of the display body part (21). Accordingly, the pair of fixing members (10) may stably and balancedly fix the display body part (21).

[0157] According to the fifth embodiment of the present invention, the fixing member (10) of the strain inspection element (401) can be made of various materials that can fix the display body part (21) to the printed circuit board (B).

[0158] As an example, the fixing member (10) may be formed of an adhesive that can fixally attach the display body (21) to the printed circuit board (B). The adhesive may be configured so that the adhesive strength disappears when the display body (21) and the printed circuit board (B) are detached after being bonded to each other. At this time, the adhesive may be a hot melt adhesive or a liquid resin adhesive. Here, the hot melt adhesive may be an adhesive having a melting point higher than a certain temperature in order to improve heat resistance. The hot melt adhesive may be formed of any one of ethylene vinyl acetate, polyisobutylene, polyamide, polyethylene terephthalate, polypropylene, polyester, polyimide, and polyethylene, but is not limited thereto. Here, as the liquid resin adhesive, a curable adhesive such as a silicone resin or a fluororesin, or a thermosetting adhesive in the form of a film may be used, but is not limited thereto.

[0159] As another example, the fixing member (10) may be made of an adhesive that can fixally attach the display body (21) to the printed circuit board (B). The adhesive may be configured so that the display body (21) and the printed circuit board (B) can be attached to each other and then detached, or detached and then reattached. As the adhesive, an adhesive coated on both sides (double-sided adhesive tape) made of acrylic, silicone, PU, ​​fluororesin, polyethylene terephthalate film, polyimide film, aluminum foil, copper foil, paper, etc. may be used, but the present invention is not limited thereto.

[0160] As another example, the fixing member (10) may be made of a conductive material. For this purpose, the fixing member (10) may be formed by a soldering process, but is not limited thereto. The fixing member (10) may include at least one of lead (Pb), copper (Cu), aluminum (Al), and silver (Ag), but is not limited thereto.

[0161] At this time, the conductive fixing member (10) can be connected to a circuit formed on the printed circuit board (B). Accordingly, information regarding the resistance applied to the fixing member (10) or the current and / or voltage flowing through the fixing member (10) can be transmitted to other elements or components coupled to the printed circuit board (B). Using this, the strain applied to the printed circuit board (B) can be measured. This will be described in detail with reference to FIGS. 13 and 14.

[0162] Referring to FIGS. 11 and 12, a strain inspection element (401) according to a fifth embodiment of the present invention may include a display member (420). The display member (420) may be a member for externally displaying information regarding strain applied to a printed circuit board (B).

[0163] To this end, the display member (420) may include a display body (21). The display body (21) may be configured to cause cracks or breakage when a predetermined deformation (bending, deflection, strain) is applied to the printed circuit board (B).

[0164] In this embodiment, when the printed circuit board (B) is deformed, stress is also applied to the display body (21) fixed to the printed circuit board (B) by the fixing member (10), so cracks or damage may occur in the display body (21). The material of the display body (21) may include at least one of glass, silicon wafer, gypsum, and plastic, but is not limited thereto.

[0165] As previously described, the display body (21) can externally display the strain applied to the printed circuit board (B) through the cracks or breakage. By checking the presence and / or extent of cracks or breakage in the display body (21), a worker or user can predict the strain and mechanical damage applied to the printed circuit board (B).

[0166] In this embodiment, the shape, size, and material of the display body (21) can be appropriately selected depending on the size of the strain to be detected.

[0167] As an example, as illustrated, the display body (21) may have a block shape extending in the front-back direction (Y-axis direction). The display body (21) may have a predetermined length in the front-back direction (Y-axis direction). The display body (21) may have a predetermined thickness in the up-down direction (Z-axis direction). The display body (21) may have a predetermined width in the left-right direction (X-axis direction). The stress applied to the display body (21) may be proportional to the length of the display member (420) and inversely proportional to the width of the display body (21).

[0168] For example, the length of the display body (21) may be 4 to 6 mm, the thickness may be 80 to 150 μm, the width may be 1 to 3 mm, and the material of the display body (21) may include glass, but is not limited thereto.

[0169] In this embodiment, the upper part of the display body part (21) may be provided with an upper surface (22) extending along the front-back direction (Y-axis direction), and the lower part may be provided with a lower surface (24) extending along the front-back direction (Y-axis direction).

[0170] In this embodiment, the upper surface (22) and the lower surface (24) may have a predetermined length along the front-back direction (Y-axis direction). The upper surface (22) and the lower surface (24) may have a predetermined width in the left-right direction (X-axis direction). The upper surface (22) and the lower surface (24) may face each other in the up-down direction (Z-axis direction).

[0171] In this embodiment, the lower surface (24) may be arranged to face the printed circuit board (B). At this time, the lower surface (24) may be provided with fixing members (10) so as to be respectively contacted. A pair of fixing members (10) may be respectively provided on one part and another part of the lower surface (24). At this time, the one part and the other part may be parts arranged at a predetermined distance from each other in the longitudinal direction (Y-axis direction) of the display body part (21).

[0172] In this embodiment, the front and rear of the display body (21) may each be provided with end faces (28). The end faces (28) may be formed in the thickness direction (Z-axis direction) of the display body (21). The end faces (28) may have a predetermined width in the left-right direction (X-axis direction).

[0173] In this embodiment, the left and right sides of the display body (21) may each be provided with a border surface (26). The border surface (26) may be connected to the left and right borders of the upper surface (22) and the lower surface (24), respectively. The border surface (26) may be formed in the thickness direction (Z-axis direction) of the display body (21). The border surface (26) may extend along the front-back direction (Y-axis direction), which is the extension direction of the display body (21).

[0174] Meanwhile, in this embodiment, the display body part (21) has been described as having a block shape formed of a rectangular parallelepiped, but the shape of the display body part (21) may be appropriately modified as needed in consideration of the size of the strain to be inspected, the space in which the display body part (21) is installed, or the shape of the printed circuit board (B). For example, the display body part (21) may have a shape in which at least one portion is bent.

[0175] Referring again to FIGS. 11 and 12, the display member (420) of the strain inspection element (401) according to the fifth embodiment of the present invention may include a strength deformation portion (429). The strength deformation portion (429) may be a configuration that controls the strength (or rigidity) of the display body portion (21) in order to set a stress value at which a crack or breakage occurs in the display body portion (21) to a specific value.

[0176] For example, if 3000 με can be measured with the display body (21) that is not equipped with the strength deformation portion (429), a specific stress value between 300 and 2500 με (or a stress value included in an interval therebetween) can be measured by equipping the strength deformation portion (429).

[0177] In this embodiment, the strength deformation portion (429) may be formed in the display body portion (21). As illustrated, the strength deformation portion (429) may be formed as a groove concavely formed in the upper surface (22) of the display body portion (21). Of course, the strength deformation portion (429) may also be formed as a hole penetrating the display body portion (21) in the thickness direction (Z-axis direction).

[0178] In the present embodiment, the horizontal cross-section (plane including the X-axis and the Y-axis) of the strength deformation portion (429) may have a rhombus shape. Of the four vertices of the rhombus shape, two vertices that are opposite to each other may be oriented in the longitudinal direction (Y-axis direction) of the display body portion (21), and the remaining two vertices that are opposite to each other may be oriented in the width direction (X-axis direction) of the display body portion (21).

[0179] This may be to concentrate the stress generated in the display body (21) near the vertex of the diamond shape. Accordingly, the vicinity of the vertex acts as a starting point for cracks or damage, and the cracks or damage may progress rapidly.

[0180] The number, shape, and / or size of such strength deformation portions (429) can be appropriately modified in consideration of the shape and size of the display body portion (21) and the value of the strain to be measured. For example, the shape of the cross-section of the strength deformation portion (429) can be modified into a polygon, circle, ellipse, etc. Alternatively, the strength deformation portions (429) can be configured in multiple pieces and arranged along the longitudinal direction (Y-axis direction) of the display body portion (21).

[0181] Referring to FIGS. 11 and 12, the strain inspection element (1) according to the first embodiment of the present invention may include a sensing member (30). The sensing member (30) may be a member for quickly and accurately detecting strain applied to a printed circuit board (B).

[0182] In this embodiment, the sensing member (30) may be made of a conductive material. In addition, the sensing member (30) may be supported by the display body (21) so that the sensing member (30) may be deformed and its resistance may change as cracks or damage occur in the display body (21).

[0183] This may be to detect the strain based on a change in resistance applied to the sensing member (30). As an example, the material forming the sensing member may include at least one of aluminum (Al), titanium (Ti), tungsten (W), and indium tin oxide (ITO), but is not limited thereto.

[0184] In this embodiment, the sensing member (30) may extend along the forward-backward direction (Y-axis direction), which is the extension direction of the display member (420). As an example, the sensing member (30) may be formed of a metal line extending in the forward-backward direction (Y-axis direction), but is not limited thereto.

[0185] In the present embodiment, the sensing member (30) may be provided on the upper surface (22) of the display member (420). As an example, the sensing member (30) may be attached to the upper surface (22). As another example, the sensing member (30) may be formed by being deposited on the upper surface (22). The method by which the sensing member (30) is formed is not particularly limited. In this case, the sensing member (30) may be formed so as not to have any possible effect on the stress value that causes cracks or breakage in the display member (420).

[0186] At this time, the sensing member (30) of the strain inspection element (1) according to the first embodiment of the present invention may be disposed at a predetermined distance from the strength deformation portion (429). As illustrated, the sensing member (30) may be disposed at a predetermined distance from the side of the strength deformation portion (429). Alternatively, the sensing member (30) may not be in contact with the strength deformation portion (429). This may be to minimize the influence of the strength (or stiffness) control of the display body portion (21) by the strength deformation portion (429) on the sensing member (30).

[0187] Meanwhile, in the present embodiment, the sensing member (30) may be electrically connected to a pair of fixing members (10) made of a conductive material, respectively. Although not specifically illustrated, one side of the sensing member (30) in the extension direction may be electrically connected to one of the pair of fixing members (10), and the other side of the extension direction may be electrically connected to the other of the pair of fixing members (10).

[0188] This configuration may be intended to accurately and quickly detect strain applied to the printed circuit board (B) using other elements or components mounted on the printed circuit board (B). This will be described in detail with reference to FIGS. 13 and 14.

[0189] Hereinafter, a process of checking strain applied to a printed circuit board by a strain sensing element according to a fifth embodiment of the present invention is briefly described.

[0190] Referring to FIGS. 12 to 14, when a predetermined external force (F) is applied to a printed circuit board (B) equipped with a strain inspection element (401) according to the fifth embodiment of the present invention, a strain is applied to the printed circuit board (B) and the printed circuit board (B) may be deformed. For example, as illustrated in FIG. 13, the printed circuit board (B) may be bent in the vertical direction (Z-axis direction).

[0191] As the printed circuit board (B) is bent, a predetermined deformation may occur and stress may be applied to the display body (21) fixed to the printed circuit board (B) by the fixing member (10). Similarly, a predetermined deformation may occur and stress may be applied to the detection member (30) supported by the display body (21).

[0192] At this time, when the strain applied to the printed circuit board (B) reaches a predetermined value, a crack or breakage (A) may occur in the display body portion (21). The crack or breakage (A) may occur in a portion adjacent to the strength deformation portion (429). The crack or breakage (A) generated in the display body portion (21) can be used by a worker or user to predict the strain or mechanical damage applied to the printed circuit board (B).

[0193] In addition, cracks or damage (A) may occur in the detection member (30) supported by the display body (21). Accordingly, the resistance value of the detection member (30) may change.

[0194] As an example, the sensing member (30) may be broken by the crack or breakage (A). As a result, the resistance value of the sensing member (30) may increase infinitely. As another example, even if the sensing member (30) is not broken, the resistance value of the sensing member (30) may change due to deformation caused by the crack or breakage (A).

[0195] The resistance change value or degree of resistance change of the detection member (30) can be varied as needed, taking into consideration the shape of the printed circuit board (B), the installation position or material of the display body (21), etc.

[0196] The change in resistance of the sensing member (30) can be measured using various methods or devices. For example, by electrically connecting the test terminals of the measuring device to each of the two sides of the sensing member (30) in the extension direction, the change in the resistance value of the sensing member (30) can be accurately and quickly measured.

[0197] As another example, the change in resistance of the sensing member (30) can be measured by another element or component mounted on the printed circuit board (B). More specifically, a pair of fixing members (10) can be made of a conductive material, and both extending sides of the sensing member (30) can be electrically connected to the pair of fixing members (10), respectively. In addition, the element or component can be electrically connected to the pair of fixing members (10) through the circuit pattern of the printed circuit board (B). The element or component can accurately and quickly measure the change in resistance of the sensing member (30).

[0198] In this way, when the resistance of the detection member (30) changes infinitely or reaches a predetermined reference value or reference range, it can be determined that a strain corresponding to a crack or damage in the display body (21) has been applied to the printed circuit board (B). Here, the reference value or reference range can be obtained in advance through experiments, etc.

[0199] As described above, the strain inspection element (401) according to the fifth embodiment of the present invention is configured to detect strain applied to the printed circuit board (B) by utilizing a change in resistance of the detection member (30), and thus the strain can be accurately and quickly measured.

[0200] Because, in this embodiment, the strain is determined from physical data such as a change in resistance of the sensing member (30), it can be measured regardless of the skill of the user or worker, and also, because the resistance value of the sensing member (30) changes immediately when strain is applied to the printed circuit board (B), the strain can be quickly detected.

[0201] FIG. 15 discloses a strain test element (501) according to a sixth embodiment of the present invention. Referring to FIG. 15, a sensing member (530) of the strain test element (501) according to the sixth embodiment of the present invention can be supported on a border surface (26) of a display member (420).

[0202] As an example, the sensing member (530) may be attached or coupled to the edge surface (26). As another example, the sensing member (530) may be formed on the edge surface (26) through a deposition process. The method of forming the sensing member (530) is not particularly limited.

[0203] The position of the sensing member (530) may be to minimize the influence on the strength of the display member (40). This is because the border surface (26) has a relatively large relationship with the thickness of the display member (20), and the upper surface (22) or the lower surface (24) has a relatively large relationship with the length or width of the display member (20), and the bending strength (or stiffness) of the display member (420) has a large relationship with the length and width rather than the thickness of the display member (420).

[0204] Additionally, in this embodiment, since the sensing member (530) is positioned on a surface where the strength deformation member (429) is not provided, the influence of the sensing member (530) on the strength (or stiffness) control of the strength deformation member (429) can be minimized.

[0205] Fig. 16 discloses a strain test element (601) according to a seventh embodiment of the present invention. Referring to Fig. 16, the sensing member (630) of the strain test element (601) according to the seventh embodiment of the present invention may extend from one side of the display body (21) to the other side by bypassing the strength deformation portion (429). At this time, the one side and the other side of the display body (21) may be one side and the other side in the longitudinal direction (Y-axis direction) of the display body (21).

[0206] In this embodiment, the detection member (630) may include an extension portion (632) extending in the longitudinal direction (Y-axis direction) of the display body portion (21). At this time, the extension portion (632) may be configured in multiple pieces.

[0207] As illustrated, the extension portion (632) may be composed of two. At this time, the two extension portions (632) may be arranged parallel to each other in the longitudinal direction (Y-axis direction) of the display body portion (21) with the strength deformation portion (429) interposed therebetween.

[0208] In the present embodiment, the sensing member (630) may include a bypass portion (634) that bypasses the strength deformation portion (429). At this time, the bypass portion (634) may surround a side of the strength deformation portion (429). The bypass portion (634) may be positioned at a predetermined distance from the strength deformation portion (429). At this time, a plurality of extension portions (632) may be connected by the bypass portion (634).

[0209] Accordingly, the configuration of the strain test element (601) can be made compact while minimizing the influence of the detection member (630) on the strength deformation portion (429).

[0210] FIGS. 17 and 18 disclose a strain inspection element (701) according to an eighth embodiment of the present invention. Referring to FIGS. 17 and 18, the sensing member (730) of the strain inspection element (701) according to the eighth embodiment of the present invention may be provided inside the display member (420).

[0211] In other words, in the present embodiment, the sensing member (730) may be extended to pass through the display member (420). As illustrated, the sensing member (730) may extend to pass through the interior of the display member (420) in the longitudinal direction (Y-axis direction) of the display member (420). Accordingly, the sensing member (730) may be protected from external contamination or impact by the display member (420).

[0212] Furthermore, in the present embodiment, since the sensing member (730) is surrounded by the display member (420), the sensing member (730) can be affected by cracks or breakage of the display member (420) in various directions. This allows the sensing member (730) to react more sensitively to cracks or breakage of the display member (420) and change its resistance value, thereby increasing the accuracy and speed of the strain test device (701).

[0213] At this time, the detection member (730) may be placed at a predetermined distance from the strength deformation member (429). This may be to minimize the influence of the strength (or stiffness) control of the strength deformation member (429) on the detection member (730).

[0214] FIGS. 19 and 20 disclose a strain test element (801) according to a ninth embodiment of the present invention. Referring to FIGS. 19 and 20, the strain test element (801) according to the ninth embodiment of the present invention may include a fixing member (10), an indicator member (20), and a detection member (30). At this time, the fixing member (10), the indicator member (20), and the detection member (30) may be configured identically to the fixing member, the indicator member, and the detection member according to the first embodiment of the present invention, respectively.

[0215] At this time, the strain inspection element (801) according to the ninth embodiment of the present invention may include a joining member (840). The joining member (840) may be a member for joining (or joining) the display member (20) and the fixing member (10) to each other. In other words, the display member (20) may be joined (or joined) to the fixing member (10) via the joining member (840). The joining member (840) may be formed of a metal layer for soldering.

[0216] In this embodiment, the bonding member (840) can expand the scope of application of the strain inspection element (801). For example, when the display member (20) is attached to the printed circuit board (B) using an acrylic adhesive, strain measurement is impossible at temperatures above 80 degrees. This is because the heat-resistant temperature of the acrylic adhesive is 80 degrees.

[0217] However, when the display member (20) is installed on the printed circuit board (B) by soldering via a joining member (840) as in the present embodiment, the strain applied to the printed circuit board (B) can be accurately and quickly detected even in high-temperature processes that cause heat damage, such as a thermal compression process or a thermal cycle test. Furthermore, the display member (20) can be easily installed on the printed circuit board (B) by the joining member (840).

[0218] In the present embodiment, the connecting member (840) may be provided in the left and right regions of the lower surface (24) of the display member (20), respectively. In addition, the connecting member (840) may not be provided in the central region located between the left and right regions of the lower surface (24) of the display member (20). Of course, the connecting member (840) may be provided entirely on the lower surface (24) of the display member (20), if necessary.

[0219] In the present embodiment, the bonding member (840) may be formed of multiple metal layers. For example, the bonding member (840) may include a titanium (Ti) thin film layer formed on the lower surface (24) of the display member (20), a copper (Cu) thin film layer formed on the titanium thin film layer, a nickel (Ni) thin film layer formed on the copper thin film layer, and a gold (Au) thin film layer formed on the nickel thin film layer.

[0220] Here, the titanium thin film layer can function as a seed material that increases the bonding strength between the display member (20) made of glass and the copper thin film layer. For example, the thickness of the gold thin film layer can be 0.05 um, the thickness of the nickel thin film layer can be 0.2 um, the thickness of the copper thin film layer can be 0.5 um, and the thickness of the titanium thin film layer can be 0.04 um, but is not limited thereto.

[0221] Hereinafter, a process of checking strain applied to a printed circuit board by a strain sensing element according to the ninth embodiment of the present invention is briefly described.

[0222] Referring to FIGS. 20 and 21, when a predetermined external force (F) is applied to a printed circuit board (B) equipped with a strain inspection element (801) according to the ninth embodiment of the present invention, a strain is applied to the printed circuit board (B) and the printed circuit board (B) may be deformed. For example, as illustrated in FIG. 20, the printed circuit board (B) may be bent in the vertical direction (Z-axis direction).

[0223] As the printed circuit board (B) bends, a predetermined deformation may occur and stress may be applied to the display member (20) fixed to the printed circuit board (B) by the fixing member (10). Similarly, a predetermined deformation may occur and stress may be applied to the detection member (30) supported by the display member (20).

[0224] At this time, when the strain applied to the printed circuit board (B) reaches a predetermined value, a crack or breakage (A) may occur in the display member (20). The crack or breakage (A) that occurs in the display member (20) can be used by a worker or user to predict the strain or mechanical damage applied to the printed circuit board (B).

[0225] And, cracks or breakage (A) may also occur in the detection member (30) supported by the display member (20). Accordingly, the resistance value of the detection member (30) may change. For example, the detection member (30) may be broken due to the crack or breakage (A). As a result, the resistance value of the detection member (30) may increase infinitely. As another example, even if the detection member (30) is not broken, the resistance value of the detection member (30) may change due to deformation caused by the crack or breakage (A).

[0226] The resistance change value or degree of resistance change of the detection member (30) can be varied as needed, taking into consideration the shape of the printed circuit board (B), the installation position or material of the display member (20), etc.

[0227] The change in resistance of the sensing member (30) can be measured using various methods or devices. For example, by electrically connecting the test terminals of the measuring device to each of the two extending sides of the sensing member (30), the change in resistance of the sensing member (30) can be accurately and quickly measured.

[0228] As another example, the change in resistance of the sensing member (30) can be measured by another element or component mounted on the printed circuit board (B). More specifically, a pair of fixing members (10) can be made of a conductive material, and both extending sides of the sensing member (30) can be electrically connected to the pair of fixing members (10), respectively. In addition, the element or component can be electrically connected to the pair of fixing members (10) through the circuit pattern of the printed circuit board (B). The element or component can accurately and quickly measure the change in resistance of the sensing member (30).

[0229] In this way, when the resistance of the detection member (30) changes infinitely or reaches a predetermined reference value or reference range, it can be determined that a strain corresponding to a crack or breakage of the display member (20) has been applied to the printed circuit board (B). Here, the reference value or reference range can be obtained in advance through experiments, etc.

[0230] As described above, the strain inspection element (801) according to the ninth embodiment of the present invention is configured to detect strain applied to the printed circuit board (B) by using a change in the resistance value of the detection member (30), and thus the strain can be accurately and quickly measured.

[0231] Because, in this embodiment, the strain is determined from physical data such as a change in resistance of the sensing member (30), it can be measured regardless of the skill of the user or worker, and also, because the resistance value of the sensing member (30) changes immediately when strain is applied to the printed circuit board (B), the strain can be quickly detected.

[0232] Fig. 22 discloses a strain test element (901) according to a tenth embodiment of the present invention. Referring to Fig. 22, a sensing member (930) of the strain test element (901) according to the tenth embodiment of the present invention can be supported on a border surface (26) of a display member (20).

[0233] As an example, the sensing member (930) may be attached or coupled to the edge surface (26). As another example, the sensing member (930) may be formed on the edge surface (26) through a deposition process. The method of forming the sensing member (930) is not particularly limited.

[0234] The position of the sensing member (930) may be to minimize the influence on the strength of the display member (20). This is because the border surface (26) has a relatively large relationship with the thickness of the display member (20), and the upper surface (22) or the lower surface (24) has a relatively large relationship with the length or width of the display member (20), and the bending strength (or stiffness) of the display member (20) has a large relationship with the length and width rather than the thickness of the display member (20).

[0235] FIGS. 23 and 24 disclose a strain test element (1001) according to an eleventh embodiment of the present invention. Referring to FIGS. 23 and 24, the sensing member (1030) of the strain test element (1001) according to the eleventh embodiment of the present invention may be provided inside the display member (20).

[0236] In other words, in the present embodiment, the sensing member (1030) may be extended to pass through the display member (20). As illustrated, the sensing member (1030) may extend through the interior of the display member (20) in the longitudinal direction (Y-axis direction) of the display member (20). Accordingly, the sensing member (1030) may be protected from external contamination or impact by the display member (20).

[0237] Furthermore, in the present embodiment, since the sensing member (1030) is surrounded by the display member (20), the sensing member (1030) can be affected by cracks or breakage of the display member (20) in various directions. This allows the sensing member (1030) to react more sensitively to cracks or breakage of the display member (20) and change its resistance value, thereby increasing the accuracy and speed of the strain test device (1001).

[0238] Figures 25 and 26 disclose a strain test element (1101) according to a twelfth embodiment of the present invention. The fixing member (1110) of the strain test element (1101) according to the twelfth embodiment of the present invention may include a first fixing member (1112) and a second fixing member (1114), and the coupling member (1140) may include a first coupling member (1142) and a second coupling member (1144).

[0239] In the present embodiment, the first coupling member (1142) may be provided on one side of the display member (20), and the second coupling member (1144) may be provided on the other side of the display member (20). As illustrated, the first coupling member (1142) may be provided on one part of the lower surface (24), and the second coupling member (1144) may be provided on the other part of the lower surface (24). At this time, the first coupling member (1142) and the second coupling member (1144) may be spaced apart from each other by a predetermined distance in the extension direction (Y-axis direction) of the display member (20).

[0240] In the present embodiment, the first coupling member (1142) can be coupled with the first fixing member (1112), and the second coupling member (1144) can be coupled with the second fixing member (1114). At this time, the coupling can be performed by a soldering process as described above. In this case, the first coupling member (1142) and the first fixing member (1112) can be electrically connected to each other, and the second coupling member (1144) and the second fixing member (1114) can be electrically connected to each other.

[0241] In this embodiment, the sensing member (1130) can electrically connect the first coupling member (1142) and the second coupling member (1144). For example, the sensing member (1130) can be provided on the lower surface (24) of the display member (20).

[0242] In the present embodiment, one side of the sensing member (1130) may be coupled or connected to the first coupling member (1142), and the other side may be coupled or connected to the second coupling member (1144). In addition, at least a part (or a section) of the sensing member (1130) may extend along the extension direction (Y-axis direction) of the indicator member (20). The shape or position of the sensing member (1130) is not particularly limited as long as it can connect the first coupling member (1142) and the second coupling member (1144), while allowing resistance to change due to breakage or cracking of the indicator member (20).

[0243] By this configuration, the strain inspection element (1101) according to the present embodiment is mounted on the printed circuit board (B), and can measure the strain applied to the printed circuit board (B) by utilizing another element or component electrically connected to the fixing member (1110). This is because the element or component can indirectly measure the resistance change of the detection member (1130) based on the resistance change between the first fixing member (1112) and the second fixing member (1114).

[0244] Meanwhile, the strain sensing elements according to embodiments of the present invention in this disclosure are configured to detect strain applied during the manufacturing process of a printed circuit board. However, the strain sensing elements according to embodiments of the present invention may also be used to detect strain applied to a manufactured printed circuit board during actual use (or operation).

[0245] Hereinafter, a method for manufacturing a strain test element according to an embodiment of the present invention (hereinafter referred to as a manufacturing method) is described by using different drawings.

[0246] Fig. 27 is a flowchart schematically illustrating a method for manufacturing a strain test element according to a first embodiment of the present invention. Fig. 28 is a flowchart schematically illustrating a method for manufacturing a strain test element according to a second embodiment of the present invention. Fig. 29 is a flowchart schematically illustrating a method for manufacturing a strain test element according to a third embodiment of the present invention.

[0247] First, a manufacturing method according to a first embodiment of the present invention will be described. Referring to FIGS. 3 and 27, in the manufacturing method according to the first embodiment of the present invention, a display member (20) is provided (S10). The material, shape, and size of the display member (20) can be appropriately modified according to the magnitude and direction of the strain (i.e., stress) to be measured using the strain inspection device (1).

[0248] As an example, as shown, the display member (20) may be made of glass material and may have a block shape having a predetermined length in the front-back direction (Y-axis direction), a predetermined width in the left-right direction (X-axis direction), and a predetermined thickness in the up-down direction (Z-axis direction).

[0249] Referring to FIGS. 3 and 11, in a manufacturing method according to a first embodiment of the present invention, a display member (20) is provided (S10), and a detection member (30) is supported on the display member (20) (S20). As an example, in step S20 according to an embodiment of the present invention, as illustrated in FIGS. 9 and 10, the detection member (230) may be formed and supported inside the display member (20). For example, the detection member (230) may be formed to penetrate the display member (20).

[0250] As another example, in step S20 according to one embodiment of the present invention, as illustrated in FIGS. 3 to 8, the sensing member (30, 130) may be formed and supported on the outer surface of the display member (20). The sensing member (30) may be formed on the upper surface (22) of the display member (20), or the sensing member (130) may be formed on the edge surface (26) of the display member (20).

[0251] At this time, the sensing member (30) may be attached to the outer surface of the display member (20). For this purpose, a predetermined adhesive or adhesive may be used. Alternatively, the sensing member (30) may be attached to the outer surface of the display member (20) by a welding process. Alternatively, the sensing member (30) may be formed by depositing a predetermined material on the outer surface of the display member (20). The predetermined material may include, but is not limited to, indium tin oxide (ITO). The process of depositing the predetermined material may be performed using various known techniques.

[0252] Referring again to FIGS. 3 and 27, in the manufacturing method according to the first embodiment of the present invention, the detection member (30) is supported on the display member (20) (S20), and the display member (20) is coupled to the fixing member (10) (S30). At this time, the order of steps S30 and S20 is not particularly limited.

[0253] In this embodiment, the fixing member (10) may be a conductive member formed by an adhesive, glue, or soldering process, but is not limited thereto, and the fixing member (10) may be formed of various members capable of fixing the display member (20) to the printed circuit board (B).

[0254] At this time, the display member (20) can be combined with the fixing member (10) while the fixing member (10) is installed on the printed circuit board (B). Alternatively, the display member (20) and the fixing member (10) may be first combined and then the fixing member (10) may be installed on the printed circuit board (B).

[0255] Next, a manufacturing method according to a second embodiment of the present invention will be described. Referring to FIGS. 11 and 28, in the manufacturing method according to the second embodiment of the present invention, a display body part (21) of a display member (420) is provided (S110). The material, shape, and size of the display body part (21) can be appropriately modified according to the magnitude and direction of the strain (i.e., stress) to be measured using the strain inspection element (401).

[0256] As an example, as shown, the display body (21) may be made of glass material and may have a block shape having a predetermined length in the front-back direction (Y-axis direction), a predetermined width in the left-right direction (X-axis direction), and a predetermined thickness in the up-down direction (Z-axis direction).

[0257] Referring to FIG. 11 and FIG. 28, in a manufacturing method according to the second embodiment of the present invention, a display body part (21) is provided (S110), and a strength deformation part (429) is formed in the display body part (21) (S120).

[0258] At this time, in this embodiment, the strength deformation portion (429) may be formed concavely on the upper surface (22) of the display body portion (21). Alternatively, the strength deformation portion (429) may be formed penetrating the display body portion (21) in the thickness direction (Z-axis direction).

[0259] At this time, in the present embodiment, the cross-section of the strength deformation portion (429) may have a rhombus shape. The vertices of the rhombus shape may be oriented in the longitudinal direction (Y-axis direction) and the width direction (X-axis direction) of the display body portion (21). The number, position, and cross-sectional shape of the strength deformation portion (29) may be variously modified as needed.

[0260] Referring to FIG. 11 and FIG. 28, in a manufacturing method according to the second embodiment of the present invention, a strength deformation portion (429) is formed in the display body portion (21) (S120), and a detection member (30) is supported on the display body portion (21) (S130).

[0261] As an example, in step S130 according to the second embodiment of the present invention, the detection member (730) may be formed inside the display body (21) as illustrated in FIGS. 17 and 18. For example, the detection member (730) may be formed penetrating the display body (21). At this time, the detection member (730) and the strength deformation member (429) may be arranged at a predetermined distance apart.

[0262] As another example, in step S130 according to the second embodiment of the present invention, as illustrated in FIGS. 11 to 15, a sensing member (30, 530) may be formed on the outer surface of the display member (420). The sensing member (30) may be formed on the upper surface (22) of the display body (21), or the sensing member (530) may be formed on the edge surface (26) of the display body (21). At this time, the sensing member (30, 530) and the strength deformation member (429) may be arranged at a predetermined distance.

[0263] Meanwhile, the sensing member (30) may be attached to the outer surface of the display body (21). For this purpose, a predetermined adhesive or adhesive may be used. Alternatively, the sensing member (30) may be attached to the outer surface of the display body (21) by a welding process. Alternatively, the sensing member (30) may be formed by depositing a predetermined material on the outer surface of the display body (21). The predetermined material may include, but is not limited to, indium tin oxide (ITO). The process of depositing the predetermined material may be performed using various known techniques.

[0264] Referring again to FIG. 11 and FIG. 28, in a manufacturing method according to one embodiment of the present invention, a detection member (30) is supported on a display body part (21) (S130), and the display body part (21) is coupled to a fixing member (10) (S140).

[0265] In this embodiment, the fixing member (10) may be a conductive member formed by an adhesive, glue, or soldering process, but is not limited thereto, and the fixing member (10) may be formed of various members capable of fixing the display body portion (21) to the printed circuit board (B).

[0266] At this time, the display body part (21) can be combined with the fixing member (10) while the fixing member (10) is installed on the printed circuit board (B). Alternatively, the fixing member (10) can be installed on the printed circuit board (B) after the display body part (21) and the fixing member (10) are first combined.

[0267] Meanwhile, in the present embodiment, steps S120 to S140 have been described as being performed sequentially in the order shown in FIG. 28, but the order of steps S120 to S140 is not particularly limited. For example, step S130 may be performed after step S140 is performed, and step S120 may be performed after step S130 is performed.

[0268] Next, a manufacturing method according to a third embodiment of the present invention will be described. Referring to FIGS. 19 and 29, in the manufacturing method according to the third embodiment of the present invention, a display member (20) is provided (S210). The material, shape, and size of the display member (20) can be appropriately modified according to the magnitude and direction of the strain (i.e., stress) to be measured using the strain inspection element (801).

[0269] As an example, as shown, the display member (20) may be made of glass material and may have a block shape having a predetermined length in the front-back direction (Y-axis direction), a predetermined width in the left-right direction (X-axis direction), and a predetermined thickness in the up-down direction (Z-axis direction).

[0270] Referring to FIGS. 19 and 29, in a manufacturing method according to a third embodiment of the present invention, a display member (20) is provided (S210), and a bonding member (840) is formed on the outer surface of the display member (20) (S220). At this time, the bonding member (840) may be formed of a metal layer for soldering.

[0271] In step S220 of the manufacturing method according to the third embodiment of the present invention, a predetermined metal material may be deposited on the outer surface of the display member (20) to form a bonding member (840). For example, the metal material may be deposited through an "Evaporation" or "Sputtering" process.

[0272] At this time, in this embodiment, different types of metals can be sequentially deposited on the outer surface of the display member (20). For example, titanium, copper, nickel, and gold can be sequentially deposited on the outer surface of the display member (20).

[0273] At this time, in step S220 according to one embodiment of the present invention, as illustrated in FIGS. 25 and 26, a first connecting member (1142) may be formed on one portion of the lower surface (24) of the display member (20), and a second connecting member (1144) may be formed on another portion of the lower surface (24). At this time, the one portion and the other portion of the lower surface (24) may be spaced apart from each other by a predetermined distance in the extension direction (Y-axis direction) of the display member (20).

[0274] Referring to FIGS. 19, 20 and 29, in a manufacturing method according to a third embodiment of the present invention, a joining member (840) is formed on the outer surface of the display member (20) (S220), and a sensing member (30) is supported on the display member (20) (S230).

[0275] As an example, in step S230 according to the third embodiment of the present invention, a sensing member (1030) may be formed and supported inside the display member (20) as illustrated in FIGS. 23 and 24. For example, the sensing member (1030) may be formed to penetrate the display member (20).

[0276] As another example, in step S230 according to the third embodiment of the present invention, as illustrated in FIGS. 19 to 22, a detection member (30, 930) may be formed and supported on the outer surface of the display member (20).

[0277] As another example, in step S230 according to the third embodiment of the present invention, the detection member (1130) may be connected to the first coupling member (1142) and the second coupling member (1144), respectively, as illustrated in FIGS. 25 and 26.

[0278] At this time, the sensing member (1130) may be formed on a surface other than the surface on which the joining member (1140) is formed. For example, if the joining member (1140) is formed on the lower surface (24) of the display member (20) in step S220, the sensing member (30) may be formed on the upper surface (22) of the display member (20) as illustrated in FIG. 19. Alternatively, the sensing member (930) may be formed on the edge surface (26) of the display member (20) as illustrated in FIG. 22.

[0279] At this time, the sensing member (30) may be attached to the outer surface of the display member (20). For this purpose, a predetermined adhesive or adhesive may be used. Alternatively, the sensing member (30) may be attached to the outer surface of the display member (20) by a welding process. Alternatively, the sensing member (30) may be formed by depositing a predetermined material on the outer surface of the display member (20). The predetermined material may include, but is not limited to, indium tin oxide (ITO). The process of depositing the predetermined material may be performed using various known techniques.

[0280] Referring again to FIGS. 19 and 29, in a manufacturing method according to a third embodiment of the present invention, a sensing member (30) is supported on a display member (20) (S230), and the display member (20) is coupled to a fixing member (10) (S240). In this embodiment, the display member (20) can be coupled to the fixing member (10) via a coupling member (840). For this purpose, the coupling member (840) can be soldered to the fixing member (10).

[0281] At this time, the display member (20) can be combined with the fixing member (10) while the fixing member (10) is installed on the printed circuit board (B). Alternatively, the display member (20) and the fixing member (10) may be first combined and then the fixing member (10) may be installed on the printed circuit board (B).

[0282] Meanwhile, in the present embodiment, steps S220 to S240 have been described as being performed sequentially in the order illustrated in FIG. 29. However, the order between step S230 and steps S220 and S240 is not particularly limited. For example, step S230 may be performed after step S240, or steps S220 and S240 may be performed after step S230.

[0283] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and various embodiments are possible within the scope equivalent to the technical idea of ​​the present invention and the patent claims to be described below by a person having ordinary skill in the art to which the present invention pertains.

[0284] [Explanation of symbols]

[0285] 1, 101, 201, 301, 401, 501, 601, 701, 801, 901, 1001, 1101: Strain test elements

[0286] 10, 1110: Fixed member

[0287] 20, 420: Absence of indication

[0288] 30, 130, 230, 330, 530, 630, 730, 930, 1030, 1130: Absence of detection

[0289] 840, 1140: Joint member

[0290] B: Printed circuit board

[0291] C: Cutting device

[0292] L: cutting line

Claims

1. A fixing member that can be placed on a printed circuit board; A display member that is fixed to a printed circuit board by the above-mentioned fixing member and may be cracked or damaged as the printed circuit board is deformed; and A strain test element, which is supported by the above-mentioned indicator member and includes a conductive sensing member whose resistance is changed as a crack or breakage occurs in the above-mentioned indicator member.

2. In paragraph 1, The above fixed member is made of a conductive material, The above sensing member is a strain test element electrically connected to each of the pair of fixing members.

3. In paragraph 1, The above sensing member is a strain test element that passes through the display member.

4. In paragraph 1, The above sensing member is a strain inspection element provided on the outer surface of the display member.

5. In paragraph 4, The above-mentioned sign member extends along one direction, The above sensing member is a strain test element provided on a side extending parallel to the above one direction.

6. In paragraph 5, The above-mentioned indication member is a strain inspection element having a block shape.

7. In paragraph 6, The above fixing member is provided on one side of the display member, The above sensing member is a strain inspection element provided on the other side opposite to the above one side.

8. In paragraph 6, The above fixing member is provided on one side of the display member, The above detection member is a strain inspection element provided on a border surface connected to the border side of the above one side.

9. In paragraph 1, The above detection member is a strain inspection element that is arranged to be broken when a crack or breakage occurs in the display member.

10. In paragraph 1, A strain inspection element having a crack guide pattern formed on one side of the above-mentioned display member.

11. In paragraph 1, A strain test element having a strength deformation portion provided in the above-mentioned display member.

12. In paragraph 11, The above sensing member is a strain inspection element arranged at a predetermined distance from the strength deformation portion.

13. In paragraph 1, A strain test device further comprising a joining member interposed between the display member and the fixing member, the joining member connecting the display member and the fixing member.

14. In paragraph 13, The above fixed member is, A first fixing member located on one side of the above-mentioned display member and made of a conductive material; and A second fixing member is located on the other side of the above-mentioned display member and is made of a conductive material, The above sensing member is a strain test element electrically connected to the first fixing member and the second fixing member, respectively.

15. In paragraph 14, The above-mentioned joining member is, A first connecting member interposed between the first fixing member and the display member; and Including a second connecting member interposed between the second fixing member and the display member, The above sensing member is a strain test element electrically connected to the first coupling member and the second coupling member, respectively.

16. A step of providing a display member that may crack or break when a predetermined deformation is applied; A step of supporting the detection member to the display member so that the resistance of the detection member changes as cracks or damage occur in the display member; and A method for manufacturing a strain test element, comprising the step of bonding a fixing member to one side of the display member for fixing the display member to a printed circuit board.

17. In paragraph 16, A method for manufacturing a strain test element, wherein in the step of supporting the sensing member to the display member, a predetermined material is deposited on the outer surface of the display member so that the sensing member is formed on the outer surface of the display member.

18. In paragraph 17, A method for manufacturing a strain test element, wherein the above-mentioned material includes indium tin oxide.

19. In paragraph 16, A method for manufacturing a strain test element, further comprising a step of forming a strength deformation portion in the display member so that the strength of the display member can be deformed.

20. In paragraph 16, Further comprising a step of forming a joining member on an outer surface of the marking member prior to the step of joining the marking member and the fixing member, A method for manufacturing a strain inspection element, wherein in the step of combining the display member and the fixing member, the combining member and the fixing member are combined to fix the display member to the fixing member.

Images