Sheet Electrical Resistance Measuring Instrument

Abstract

To suppress generation of crumples in a sheet more than when a sheet is brought in contact with a sheet by an electrode alone.SOLUTION: A sheet electric resistance measuring unit 10 includes: a first housing 20 and a second housing 22 for holding a sheet P from both surfaces; a pair of electrodes 50 provided in the first housing 20, for measuring the electric resistance of the sheet P by holding the sheet P between the electrodes and the second housing 22; and a contact member 150 provided between the pair of electrodes 50 in the first housing 20, the contact member being in contact with the sheet P.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a sheet electrical resistance measuring instrument. [Background technology]

[0002] Patent Document 1 discloses technology relating to measurement terminals used when measuring the sheet resistance of a thin film using a four-terminal method and measurement leads using these measurement terminals. In this prior art, the positions of the four measurement terminals are fixed so that the measured voltage value divided by the current value is equal to the sheet resistance value of the thin film. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-137774 A Summary of the Invention [Problem to be solved by the invention]

[0004] When measuring electrical resistance by sandwiching a sheet between two electrodes and a housing, if the sheet is wrinkled or folded when it is placed or when the electrodes are brought into contact with the sheet, the accuracy of measuring the electrical resistance may decrease.

[0005] The purpose is to prevent wrinkling of the sheet compared to when only the electrodes are in contact with the sheet. [Means for solving the problem]

[0006] The first aspect is a sheet electrical resistance meter comprising a pair of housings that sandwich a sheet on both sides, a pair of electrodes provided in one of the housings that sandwich the sheet between the other housing and measure the electrical resistance of the sheet, and a contact member provided between the pair of electrodes in one of the housings and that contacts the sheet.

[0007] A second aspect is a sheet electrical resistance meter as described in the first aspect, in which the contact member is made of an elastic material or is attached to one of the housings via an elastic material and protrudes toward the other housing beyond the electrode before contacting the sheet.

[0008] A third aspect is the sheet electrical resistance meter described in the first aspect, in which the contact member protrudes toward the other housing side beyond the electrode, and a recess is formed in the other housing at a location corresponding to the contact member.

[0009] A fourth aspect is the sheet electrical resistance meter according to the first or second aspect, further comprising an isolation mechanism that isolates the contact members from the sheet while the electrical resistance is being measured by the electrodes.

[0010] A fifth aspect is a sheet electrical resistance meter described in any one of the first to fourth aspects, in which the other housing has the sheet placed on its upper surface and has a moving mechanism that moves one of the housings from above to below relative to the upper surface of the other housing.

[0011] A sixth aspect is the sheet electrical resistance meter according to the fifth aspect, wherein the movement mechanism has a guide mechanism that moves one of the housings in a direction perpendicular to an upper surface of the other housing.

[0012] A seventh aspect is the sheet electrical resistance meter described in the fifth aspect, in which the moving mechanism has a rotation mechanism in which an end of one of the housings rotates around a rotation axis provided at the end of the other housing. Effect of the Invention

[0013] The sheet electrical resistance measuring device of the first aspect can suppress the occurrence of wrinkles in the sheet, compared to a case in which only the electrodes are in contact with the sheet.

[0014] According to the sheet electrical resistance meter of the second aspect, the occurrence of wrinkles in the sheet can be suppressed compared to when the contact members are flush with the electrodes.

[0015] According to the sheet electrical resistance measuring device of the third aspect, the occurrence of wrinkles in the sheet can be suppressed compared to when the contact members are flush with the electrodes.

[0016] According to the sheet electrical resistance meter of the fourth aspect, the range of materials that can be used to construct the contact member is wider than in the case where the contact member is in contact with the sheet while measuring the electrical resistance with the electrodes.

[0017] According to the sheet electrical resistance measuring device of the fifth aspect, the occurrence of wrinkles in the sheet can be suppressed compared to a case in which one housing moves laterally relative to the other housing.

[0018] According to the sheet electrical resistance measuring device of the sixth aspect, the occurrence of wrinkles in the sheet can be suppressed, compared to a case in which one housing is moved obliquely relative to the upper surface of the other housing.

[0019] The sheet electrical resistance meter of the seventh aspect has a simpler mechanism than one in which one housing moves in a direction perpendicular to the top surface of the other housing. [Brief description of the drawings]

[0020] [Figure 1] FIG. 2 is a perspective view of a sheet electrical resistance measuring device according to the first embodiment. [Diagram 2] FIG. 2 is a plan view of the sheet electrical resistance measuring device according to the first embodiment, as viewed from above. [Diagram 3] 1A is a side view of the sheet electrical resistance measuring device of the first embodiment as viewed from the Y direction, in which (A) is a view of a state in which the first housing is separated from the second housing, and (B) is a view of a state in which the first housing is approaching the second housing and measuring the electrical resistance of the sheet. [Figure 4] FIG. 2 is a block diagram of a sheet electrical resistance measuring instrument according to the first embodiment. [Diagram 5]11A and 11B are side views of the sheet electrical resistance measuring device of the second embodiment as viewed from the Y direction, in which (A) is a view of the first housing separated from the second housing, (B) is a view of the first housing approaching the second housing, and (C) is a view of the contact member separated from the sheet and measuring the electrical resistance of the sheet. [Figure 6] FIG. 11 is a block diagram of a sheet electrical resistance measuring instrument according to a second embodiment. [Figure 7] 11A and 11B are side views of the sheet electrical resistance measuring device of the third embodiment as viewed from the Y direction, in which (A) shows the state in which the first housing is separated from the second housing, and (B) shows the state in which the first housing is approaching the second housing and measuring the electrical resistance of the sheet. [Figure 8] FIG. 11 is a block diagram of a sheet electrical resistance measuring instrument according to a third embodiment. [Figure 9] 13A and 13B are side views of the sheet electrical resistance measuring device of the fourth embodiment as viewed from the Y direction, in which (A) is a view of a state in which the first housing is separated from the second housing, and (B) is a view of a state in which the first housing is approaching the second housing and measuring the electrical resistance of the sheet. [Figure 10] FIG. 13 is a block diagram of a sheet electrical resistance measuring instrument according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] First Embodiment A sheet electrical resistance measuring instrument according to a first embodiment of the present invention will be described. In each drawing, two directions perpendicular to the horizontal direction are defined as the X direction and the Y direction, and are indicated by the arrows X and Y, respectively. In addition, a vertical direction perpendicular to the X direction and the Y direction is defined as the Z direction, and is indicated by the arrow Z.

[0022] [structure] The structure of the sheet electrical resistance measuring device will be described.

[0023] The sheet electrical resistance meter 10 shown in Fig. 1 is a meter that measures the electrical resistance of a sheet P such as paper. The sheet electrical resistance meter 10 has a housing 12 in which a gap 14 into which the sheet P is sandwiched is formed. The housing 12 is configured to have a first housing 20 and a second housing 22. A protrusion 21 is provided at an end of the second housing 22 in the X direction. The sheet electrical resistance meter 10 of this embodiment is used by being placed on a workbench (not shown) or the like with the second housing 22 facing downward.

[0024] As shown in Figures 3(A) and 3(B), the sheet electrical resistance meter 10 has a movement mechanism 100 that allows the first housing 20 to move up and down relative to the second housing 22. The sheet electrical resistance meter 10 is configured such that the first housing 20 moves closer to (see Figure 3(B)) and away from (see Figure 3(A)) the second housing 22 using this movement mechanism 100. The movement mechanism 100 is configured to include a guide mechanism 108 and a coil spring 116. The guide mechanism 108 is configured to include a rod-shaped guide 110 and an insertion hole 120.

[0025] As shown in Fig. 1, Fig. 3(A) and Fig. 3(B), the second housing 22 is provided with a plurality of rod-shaped guides 110 (four in this embodiment) protruding from the top surface 22A, and the first housing 20 is formed with a plurality of insertion holes 120 (see Fig. 3(A) and Fig. 3(B)) through which the rod-shaped guides 110 are inserted. A head 112 larger than the insertion holes 120 (see Fig. 3(A) and Fig. 3(B)) is provided at the tip of the guide 110. In addition, the rod-shaped guide 110 is inserted into a coil spring 116 (see Fig. 3(A) and Fig. 3(B)).

[0026] With this configuration, the first housing 20 is pushed in a direction away from the second housing 22, i.e., upward (see FIG. 3(A)). However, when the subject S (see FIG. 1) pushes the first housing 20 toward the second housing 22, i.e., downward, as indicated by arrow F, the first housing 20 moves vertically downward along the guide 110 and approaches the second housing 22 (see FIGS. 1 and 3(B)).

[0027] As shown in Figures 3(A) and 3(B), a switch 130 having a lever 132 is provided at an end 20B of the first housing 20. As shown in Figure 3(A), when the first housing 20 is separated from the second housing 22, the switch 130 is off. However, as shown in Figure 3(B), when the subject S (see Figure 1) pushes the first housing 20 towards the second housing 22 and moves it vertically downward, bringing the first housing 20 close to the second housing 22, the lever 132 of the switch 130 hits the protruding portion 21, and the switch 130 is turned on.

[0028] As shown in Fig. 3(A) and Fig. 3(B), the upper surface 22A of the second housing 22 is a mounting surface on which the sheet P is mounted (see also Fig. 1). The first housing 20 is provided with electrodes 50 protruding from the lower surface 20A toward the second housing 22 at intervals in the X direction (see also Fig. 2). A contact member 150 is provided between the two electrodes 50 (see also Fig. 2). The contact member 150 of this embodiment is made of an insulating elastically deformable material, an insulating rubber material in this embodiment. Note that "insulating" refers to a property that makes it difficult for electricity to pass through, and means a volume resistivity in the range of approximately 1 x 10^6 Ωcm or more.

[0029] 3A, in a state in which the first housing 20 is separated from the second housing 22, the contact member 150 protrudes toward the second housing 22 side further than the electrode 50. In other words, the lower surface 150A of the contact member 150 is located lower than the lower surface 50A of the electrode 50.

[0030] As shown in Fig. 4, the sheet electrical resistance measuring device 10 has a control device 190. The control device 190 is electrically connected to a switch 130 (see Figs. 3(A) and 3(B)) and an electrode 50 (see Figs. 2, 3(A) and 3(B)). The control device 190 has a function of measuring the electrical resistance of the sheet P between the two electrodes 50.

[0031] The hardware configuration of the control device 190 is composed of a computer including a CPU (Central Processing Unit) not shown, a ROM (Read Only Memory) that stores programs for implementing each processing routine, a RAM (Random Access Memory) that temporarily stores data, a HDD (Hard Disk Drive), a network interface, etc.

[0032] [Measurement of sheet electrical resistance] Next, the measurement of the electrical resistance of the sheet P will be described.

[0033] 1 and 3(A), a measurer S (see FIG. 1) places a sheet P on the upper surface 22A of the second housing 22 of the sheet electrical resistance meter 10. At that time, the tip portion PA of the sheet P is abutted against the side surface of the protruding portion 21 to position it.

[0034] As shown in FIG. 3(B), the subject S (see FIG. 1) presses the first housing 20 from above to bring the electrode 50 into contact with the upper surface of the sheet P. Note that the contact member 150, which protrudes downward further than the electrode 50, comes into contact with the sheet P first. Since the contact member 150 is made of rubber, after contact, it is elastically deformed and compressed, and the electrode 50 comes into contact with the sheet P. In other words, the sheet P is sandwiched between the lower surface 50A of the electrode 50, the lower surface 150A of the contact member 150, and the upper surface 22A of the second housing 22. In addition, the switch 130 is turned on.

[0035] When a preset time has elapsed since the switch 130 was turned on, the control device 190 (see FIG. 4) measures the electrical resistance between the two electrodes 50 in contact with the sheet P. In this embodiment, the control device 190 measures the surface resistance of the sheet P between the two electrodes 50. The measured electrical resistance of the sheet P is displayed on a display unit (not shown).

[0036] [Effect] Next, the operation of this embodiment will be described.

[0037] In the sheet electrical resistance measuring instrument 10 of this embodiment, before the electrodes 50 contact the upper surface of the sheet P, the contact members 150 provided between the electrodes 50 first contact the sheet P. After contact, the contact members 150 are elastically deformed and compressed, causing the electrodes 50 to contact the sheet P.

[0038] Here, in the case of a comparative example of a sheet electrical resistance meter that does not have a contact member 150, when the sheet P is placed on the upper surface 22A of the second housing 22 or when an electrode comes into contact with the sheet P, wrinkles may occur in the sheet P, which may reduce the accuracy of measuring the electrical resistance.

[0039] In contrast, in the sheet electrical resistance measuring device 10 of the present embodiment, the contact member 150 provided between the two electrodes 50 contacts the sheet P, suppressing the occurrence of wrinkles in the sheet P. Therefore, compared to the case where the sheet P is in contact with only the electrode 50, the occurrence of wrinkles in the sheet P can be suppressed.

[0040] Furthermore, in the sheet electrical resistance measuring instrument 10 of this embodiment, the contact member 150 provided between the two electrodes 50 protrudes downward below the electrodes 50, so that the contact member 150 contacts the sheet P first, suppressing the occurrence of wrinkles in the sheet P, and then the electrode 50 contacts the sheet P. Therefore, compared to the case where the contact member 150 is flush with the electrode 50, that is, the contact member 150 contacts the sheet P at the same time as the electrode 50, it is possible to suppress the occurrence of wrinkles in the sheet P.

[0041] Furthermore, the sheet electrical resistance meter 10 of this embodiment is placed on a workbench or the like (not shown) with the second housing 22 facing down, and the sheet P is placed on the upper surface 22A of the second housing 22. Then, the moving mechanism 100 moves the upper first housing 20 from above to below the upper surface 22A of the second housing 22, so that the electrodes 50 and the contact members 150 come into contact with the sheet P. Thus, compared to the case where the first housing 20 is moved laterally relative to the second housing 22, the occurrence of wrinkles in the sheet P can be suppressed.

[0042] Furthermore, in the sheet electrical resistance measuring instrument 10 of this embodiment, the first housing 20 moves in a direction perpendicular to the upper surface 22A of the second housing 22 by the guide mechanism 108. Therefore, compared to the case where the first housing 20 moves obliquely with respect to the upper surface 22A of the second housing 22, the occurrence of wrinkles in the sheet P can be suppressed.

[0043] In this manner, the occurrence of wrinkles in the sheet P is suppressed, and therefore the decrease in the measurement accuracy of the electrical resistance caused by the occurrence of wrinkles in the sheet P is suppressed.

[0044] Second Embodiment A sheet electrical resistance measuring device according to a second embodiment of the present invention will be described below. Note that the same members as those in the first embodiment are designated by the same reference numerals, and duplicated descriptions will be omitted or simplified.

[0045] [structure] The structure of the sheet electrical resistance measuring device will be described.

[0046] A sheet electrical resistance measuring instrument 11 shown in FIGS. 5(A), 5(B) and 5(C) is a measuring instrument that measures the electrical resistance of a sheet P such as paper.

[0047] The upper surface 22A of the second housing 22 is a mounting surface on which the sheet P is placed. The first housing 20 is provided with electrodes 50 protruding from the lower surface 20A toward the second housing 22 at intervals in the X direction. A contact member 155 is provided between the two electrodes 50. The contact member 155 in this embodiment is made of a conductive material, in this embodiment, a metal. The contact member 155 is electrically grounded. In addition, "conductive" refers to a property of easily conducting electricity, and means a volume resistivity in the range of approximately 1×10^-3 cm or less.

[0048] As shown in FIG. 5(A), in a state in which the first housing 20 is separated from the second housing 22, the lower surface 155A of the contact member 155 and the lower surface 50A of the electrode 50 are flush with each other.

[0049] 5(C), contact member 155 is configured to be moved upward by isolation mechanism 154 (see FIG. 6) so that the upper side is stored inside first housing 20. Isolation mechanism 154 may be any mechanism, but in this embodiment, isolation mechanism 154 is a mechanism in which contact member 155 is moved up and down by a solenoid.

[0050] 6, the sheet electrical resistance meter 11 has a control device 190. The control device 190 is electrically connected to the switch 130 (see FIGS. 5(A), 5(B), and 5(C)), the electrode 50 (see FIGS. 5(A), 5(B), and 5(C)), and the isolation mechanism 154.

[0051] [Measurement of sheet electrical resistance] Next, the measurement of the electrical resistance of the sheet P will be described.

[0052] 5(A), the sheet P is placed on the upper surface 22A of the second housing 22 of the sheet electrical resistance meter 11. At this time, the tip portion PA of the sheet P is abutted against the side surface of the protruding portion 21 to be positioned.

[0053] As shown in Fig. 5(B), the subject S (see Fig. 1) presses the first housing 20 from above to bring the electrode 50 and the contact member 155 into contact with the upper surface of the sheet P. That is, the sheet P is sandwiched between the lower surface 50A of the electrode 50 and the lower surface 155A of the contact member 155, and the upper surface 22A of the second housing 22. In addition, the switch 130 is turned on.

[0054] When a preset time has elapsed since the switch 130 was turned on, the control device 190 (see FIG. 4) first controls the isolation mechanism 154 to move the contact member 155 upward and away from the sheet P, and store the upper side inside the first housing 20, as shown in FIG. 5(C).

[0055] After the contact member 155 moves upward, the control device 190 measures the electrical resistance between the two electrodes 50 in contact with the sheet P. In this embodiment, the control device 190 measures the surface resistance of the sheet P between the two electrodes 50. The measured electrical resistance of the sheet P is displayed on a display unit (not shown).

[0056] After the measurement, when the first housing 20 moves upward and the switch 130 is turned off, the control device 190 controls the isolation mechanism 154 to return the contact member 155 to the position shown in FIG. 5(A).

[0057] [Effect] Next, the operation of this embodiment will be described.

[0058] In the sheet electrical resistance measuring device 11 of this embodiment, the electrodes 50 contact the upper surface of the sheet P, and the contact member 155 provided between the electrodes 50 contacts the sheet P. In this manner, the contact member 155 provided between the two electrodes 50 contacts the sheet P and suppresses the occurrence of wrinkles in the sheet P, so that the occurrence of wrinkles in the sheet P can be suppressed compared to the case where only the electrodes 50 contact the sheet P.

[0059] Furthermore, the sheet electrical resistance meter 10 of this embodiment is placed on a workbench or the like (not shown) with the second housing 22 facing down, and the sheet P is placed on the upper surface 22A of the second housing 22. Then, the moving mechanism 100 moves the upper first housing 20 from above to below the upper surface 22A of the second housing 22, so that the electrodes 50 and the contact members 150 come into contact with the sheet P. Thus, compared to the case where the first housing 20 is moved laterally relative to the second housing 22, the occurrence of wrinkles in the sheet P can be suppressed.

[0060] Furthermore, in the sheet electrical resistance measuring instrument 10 of this embodiment, the first housing 20 moves in a direction perpendicular to the upper surface 22A of the second housing 22 by the guide mechanism 108. Therefore, compared to the case where the first housing 20 moves obliquely with respect to the upper surface 22A of the second housing 22, the occurrence of wrinkles in the sheet P can be suppressed.

[0061] In this manner, the occurrence of wrinkles in the sheet P is suppressed, and therefore the decrease in the measurement accuracy of the electrical resistance caused by the occurrence of wrinkles in the sheet P is suppressed.

[0062] Furthermore, in the sheet electrical resistance measuring instrument 11 of this embodiment, the contact member 155 provided between the two electrodes 50 is separated from the sheet P while the electrodes 50 are measuring the electrical resistance of the sheet P.

[0063] Therefore, the range of materials that can be used to form the contact member is wider than when the contact member is in contact with the sheet P while the electrical resistance is being measured by the electrode 50. For example, the contact member 155 can be made of a metal having electrical conductivity as in this embodiment. By making the contact member 155 conductive and electrically grounding it, for example, the surface of the sheet P is neutralized, improving the measurement accuracy of the electrical resistance.

[0064] <Third embodiment> A sheet electrical resistance measuring device according to a third embodiment of the present invention will be described below. Note that the same members as those in the first and second embodiments are designated by the same reference numerals, and duplicated descriptions will be omitted or simplified.

[0065] [structure] The structure of the sheet electrical resistance measuring device will be described.

[0066] The sheet electrical resistance measuring device 13 shown in FIG. 7(A) and FIG. 5(B) is a measuring device that measures the electrical resistance of a sheet P such as paper.

[0067] The first housing 20 is provided with electrodes 50 spaced apart in the X direction so as to protrude from the lower surface 20A towards the second housing 22. A contact member 250 is provided between the two electrodes 50. The contact member 250 in this embodiment is made of an insulating material, in this embodiment, a synthetic resin.

[0068] The contact member 250 protrudes toward the second housing 22 side further than the electrode 50. In other words, the lower surface 250A of the contact member 250 is located lower than the lower surface 50A of the electrode 50.

[0069] An upper surface 22A of the second housing 22 serves as a mounting surface on which the sheet P is mounted. A recess 200 is formed in a portion of the upper surface 22A of the second housing 22 that corresponds to the contact member 250.

[0070] 8, the sheet electrical resistance measuring device 13 has a control device 190. The control device 190 is electrically connected to a switch 130 (see FIGS. 7(A) and 7(B)) and an electrode 50 (see FIGS. 7(A) and 7(B)).

[0071] [Measurement of sheet electrical resistance] Next, the measurement of the electrical resistance of the sheet P will be described.

[0072] 7(A), sheet P is placed on upper surface 22A of second housing 22 of sheet electrical resistance meter 13. At this time, tip portion PA of sheet P is abutted against the side surface of protruding portion 21 for positioning.

[0073] As shown in FIG. 7(B), the subject S (see FIG. 1) presses the first housing 20 from above to bring the electrode 50 into contact with the upper surface of the sheet P. At that time, the contact member 250, which protrudes downward beyond the electrode 50, contacts the sheet P first. The sheet P is pressed by the contact member 250 and curves, and the curved portion PB enters the recess 200 in the upper surface 22A of the second housing 22. The sheet P is sandwiched between the lower surface 155A of the lower surface 50A of the electrode 50 and the upper surface 22A of the second housing 22. In addition, the switch 130 is turned on.

[0074] When a preset time has elapsed since the switch 130 was turned on, the control device 190 (see FIG. 8) measures the electrical resistance between the two electrodes 50 in contact with the sheet P. In this embodiment, the control device 190 measures the surface resistance of the sheet P between the two electrodes 50. The measured electrical resistance of the sheet P is displayed on a display unit (not shown).

[0075] [Effect] Next, the operation of this embodiment will be described.

[0076] In the sheet electrical resistance measuring instrument 13 of this embodiment, before the electrodes 50 contact the upper surface of the sheet P, the contact members 250 provided between the electrodes 50 first contact the sheet P. The sheet P is pressed by the contact members 250 to bend, and the curved portion PB enters the recess 200 in the upper surface 22A of the second housing 22.

[0077] In this manner, the contact member 250 provided between the two electrodes 50 comes into contact with the sheet P, suppressing the occurrence of wrinkles in the sheet P. Therefore, compared to the case where the sheet P is in contact with only the electrode 50, the occurrence of wrinkles in the sheet P can be suppressed.

[0078] Furthermore, in the sheet electrical resistance measuring instrument 10 of this embodiment, the contact member 150 provided between the two electrodes 50 protrudes downward below the electrodes 50, so that the contact member 250 comes into contact with the sheet P first, suppressing the occurrence of wrinkles in the sheet P, and then the electrode 50 comes into contact with the sheet P. Therefore, compared to the case where the contact member 150 is flush with the electrode 50, that is, the contact member 150 contacts the sheet P at the same time as the electrode 50, it is possible to suppress the occurrence of wrinkles in the sheet P.

[0079] Here, in this embodiment, the sheet P is pressed by the contact member 250 to bend, and the curved portion PB enters the recess 200 in the upper surface 22A of the second housing 22. In this manner, the sheet P is pressed by the contact member 250 to bend, thereby effectively suppressing the occurrence of wrinkles in the sheet P.

[0080] Furthermore, the sheet electrical resistance meter 13 of this embodiment is placed on a workbench (not shown) or the like with the second housing 22 facing down, and the sheet P is placed on the upper surface 22A of the second housing 22. Then, the moving mechanism 100 moves the upper first housing 20 from above to below the upper surface 22A of the second housing 22, so that the electrodes 50 and the contact members 250 come into contact with the sheet P. Thus, compared to the case where the first housing 20 is moved laterally relative to the second housing 22, the occurrence of wrinkles in the sheet P can be suppressed.

[0081] Furthermore, in the sheet electrical resistance measuring instrument 10 of this embodiment, the first housing 20 moves in a direction perpendicular to the upper surface 22A of the second housing 22 by the guide mechanism 108. Therefore, compared to the case where the first housing 20 moves obliquely with respect to the upper surface 22A of the second housing 22, the occurrence of wrinkles in the sheet P can be suppressed.

[0082] In this way, the occurrence of wrinkles in the sheet P is suppressed, thereby suppressing a decrease in the measurement accuracy of the electrical resistance caused by the occurrence of wrinkles in the sheet P. In this embodiment, a curved portion PB is formed in the sheet P. However, since the shape of the curved portion PB is constant or approximately constant, the formation of the curved portion PB has no effect on the measurement accuracy, or even if there is an effect, it is so small that it can be ignored.

[0083] <Fourth embodiment> A sheet electrical resistance measuring device according to a fourth embodiment of the present invention will be described below. Note that the same members as those in the first, second and third embodiments are denoted by the same reference numerals, and duplicated descriptions will be omitted or simplified.

[0084] [structure] The structure of the sheet electrical resistance measuring device will be described.

[0085] The sheet electrical resistance meter 15 shown in Fig. 9(A) and Fig. 9(B) is a meter that measures the electrical resistance of a sheet P such as paper. The sheet electrical resistance meter 10 has a housing 312 in which a gap 314 into which the sheet P is sandwiched is formed. The housing 312 is configured to have a first housing 320 and a second housing 322. A protrusion 321 is provided at an end of the first housing 320 in the X direction. The sheet electrical resistance meter 15 of this embodiment is used by being placed on a workbench (not shown) or the like with the second housing 322 facing down.

[0086] The sheet electrical resistance meter 15 has a rotation mechanism 300 in which a protruding portion 321 at an end of a first housing 320 rotates about a rotation shaft 350 relative to an end 322B of a second housing 22 to open and close.

[0087] Switch 130 having lever 132 is provided on end 322B of second housing 322. As shown in Fig. 9(A), switch 130 is off when first housing 320 is open relative to second housing 322. However, as shown in Fig. 9(B), when subject S (see Fig. 1) rotates first housing 320 towards second housing 322 to close it, lever 132 of switch 130 hits side surface 321A of protruding portion 321, and switch 130 is turned on.

[0088] As shown in FIGS. 9(A) and 9(B), an upper surface 322A of the second housing 322 serves as an installation surface on which a sheet P is placed.

[0089] Further, electrodes 50 are provided on the first housing 320 at intervals in the X direction so as to protrude from the lower surface 20A towards the second housing 22. A contact member 150 is provided between the two electrodes 50, as in the first embodiment.

[0090] 10, the sheet electrical resistance measuring device 15 has a control device 190. The control device 190 is electrically connected to a switch 130 (see FIGS. 9(A) and 9(B)) and an electrode 50 (see FIGS. 9(A) and 9(B)).

[0091] [Measurement of sheet electrical resistance] Next, the measurement of the electrical resistance of the sheet P will be described.

[0092] As shown in FIG. 9(A), a sheet P is placed on an upper surface 22A of a second housing 22 of a sheet electrical resistance meter .

[0093] As shown in FIG. 9(B), the subject S (see FIG. 1) closes the first housing 320 and brings the electrode 50 into contact with the upper surface of the sheet P. At that time, the contact member 150, which protrudes downward further than the electrode 50, comes into contact with the sheet P first. Since the contact member 150 is made of rubber, after contact, it is elastically deformed and compressed, and the electrode 50 comes into contact with the sheet P. In other words, the sheet P is sandwiched between the lower surface 50A of the electrode 50 and the lower surface 150A of the contact member 150, and the upper surface 22A of the second housing 22. In addition, the switch 130 is turned on.

[0094] When a preset time has elapsed since the switch 130 was turned on, the control device 190 (see FIG. 10) measures the electrical resistance between the two electrodes 50 in contact with the sheet P. In this embodiment, the control device 190 measures the surface resistance of the sheet P between the two electrodes 50. The measured electrical resistance of the sheet P is displayed on a display unit (not shown).

[0095] [Effect] Next, the operation of this embodiment will be described.

[0096] In the sheet electrical resistance measuring device 15 of this embodiment, before the electrodes 50 contact the upper surface of the sheet P, the contact member 150 provided between the electrodes 50 first contacts the sheet P. After contact, the contact member 150 elastically deforms and is compressed, causing the electrode 50 to contact the sheet P. In this way, the contact member 150 provided between the two electrodes 50 contacts the sheet P, thereby suppressing the occurrence of wrinkles in the sheet P. Therefore, compared to the case where only the electrodes 50 contact the sheet P, the occurrence of wrinkles in the sheet P can be suppressed.

[0097] In addition, in the sheet electrical resistance measuring device 15 of this embodiment, the contact member 150 provided between the two electrodes 50 protrudes downward from the electrodes 50, so that the contact member 150 contacts the sheet P first, suppressing the occurrence of wrinkles in the sheet P, and then the electrode 50 contacts the sheet P. Therefore, compared to the case where the contact member 150 is flush with the electrode 50, that is, the contact member 150 contacts the sheet P at the same time as the electrode 50, it is possible to suppress the occurrence of wrinkles in the sheet P.

[0098] Furthermore, the sheet electrical resistance meter 15 of this embodiment is placed on a workbench or the like (not shown) with the second housing 22 facing down, and the sheet P is placed on the upper surface 22A of the second housing 22. Then, the upper first housing 20 is moved from above to below the upper surface 22A of the second housing 22 by the rotation mechanism 300, so that the electrodes 50 and the contact members 150 come into contact with the sheet P. Thus, compared to the case where the first housing 20 is moved laterally relative to the second housing 22, the occurrence of wrinkles in the sheet P can be suppressed.

[0099] In this manner, the occurrence of wrinkles in the sheet P is suppressed, and therefore the decrease in the measurement accuracy of the electrical resistance caused by the occurrence of wrinkles in the sheet P is suppressed.

[0100] Furthermore, in the sheet electrical resistance meter 15, the protruding portion 321 at the end of the first housing 320 rotates about the rotation axis 350 relative to the end 322B of the second housing 22, so that the first housing 320 approaches the upper surface 322A of the second housing 322. Therefore, the mechanism is simpler than when the first housing 320 moves in a vertical direction relative to the upper surface 322A of the second housing 322, for example.

[0101] <Other> The present invention is not limited to the above embodiment.

[0102] For example, in the above embodiment, the two electrodes 50 are provided with a gap in the X direction, but this is not limited to this. For example, the two electrodes 50 may be provided with a gap in the Y direction.

[0103] For example, as in the first, third and fourth embodiments, when the contact members 150, 250 are insulating, the side surfaces of the contact members 150, 250 and the electrode 50 may be in contact with each other. The length in the X direction, the length in the Y direction and the planar shape of the contact members may be appropriately set. Furthermore, multiple contact members may be provided between the two electrodes 50.

[0104] In addition, for example, in the first and fourth embodiments, the contact member 150 is made of an elastic body, but is not limited to this. A non-elastic contact member may be attached to the first housing 20, 320 via an elastic body such as rubber, a spring, or an air cushion body.

[0105] Furthermore, the present invention is not limited to the configuration of the above embodiment, and various configurations are possible. Furthermore, the present invention can be embodied in various forms without departing from the spirit and scope of the present invention. [Explanation of symbols]

[0106] 10. Sheet electrical resistance measuring instrument 11 Sheet electrical resistance measuring instrument 13 Sheet electrical resistance measuring instrument 15 Sheet electrical resistance measuring instrument 20 First housing (an example of one housing) 22 Second housing (an example of the other housing) 22A Top 50 electrodes 100 Moving mechanism 108 Guide mechanism 150 Contact member 155 Contact member 200 Recess 250 Contact member 300 Rotation mechanism 320 First housing (an example of one housing) 322 Second housing (an example of the other housing) 322A Top P-sheet

Claims

1. A pair of housings that sandwich the sheet from both sides; a pair of electrodes provided in one of the housings, sandwiching the sheet between the other housing and the pair of electrodes to measure the electrical resistance of the sheet; a contact member provided between the pair of electrodes in one of the housings and in contact with the sheet; A sheet electrical resistance measuring instrument equipped with

2. the contact member is made of an elastic body or is attached to one of the housings via an elastic body, and protrudes toward the other housing beyond the electrode before contacting the sheet. The sheet electrical resistance measuring device according to claim 1 .

3. the contact member protrudes toward the other housing side beyond the electrode, The other housing has a recess formed at a portion corresponding to the contact member. The sheet electrical resistance measuring device according to claim 1 .

4. and an isolation mechanism for isolating the contact member from the sheet while the electrical resistance is being measured by the electrode. The sheet electrical resistance measuring instrument according to claim 1 or 2.

5. the other housing has the sheet placed on its upper surface, A moving mechanism is provided for moving one of the housings from above to below with respect to the upper surface of the other housing. The sheet electrical resistance meter according to any one of claims 1 to 4.

6. The moving mechanism has a guide mechanism that moves one of the housings in a direction perpendicular to an upper surface of the other housing. The sheet electrical resistance measuring device according to claim 5 .

7. The moving mechanism has a rotation mechanism in which an end of one of the housings rotates around a rotation axis provided at an end of the other housing. The sheet electrical resistance measuring device according to claim 5 .

8. In a plan view, the contact surfaces of the pair of electrodes are rectangular. The sheet electrical resistance meter according to any one of claims 1 to 7.

9. In a plan view, the contact surface of the contact member is rectangular. The sheet electrical resistance meter according to any one of claims 1 to 8.

Images