WO2011142332A1 - 静電容量式の入力装置 - Google Patents
静電容量式の入力装置 Download PDFInfo
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- WO2011142332A1 WO2011142332A1 PCT/JP2011/060702 JP2011060702W WO2011142332A1 WO 2011142332 A1 WO2011142332 A1 WO 2011142332A1 JP 2011060702 W JP2011060702 W JP 2011060702W WO 2011142332 A1 WO2011142332 A1 WO 2011142332A1
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- pattern
- electrode patterns
- lower electrode
- electrode pattern
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0445—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
Definitions
- the present invention relates to an electrostatic capacitance type input device capable of detecting an input coordinate position, and more particularly to an input device in which an operation surface is formed in a curved surface shape.
- FIG. 9 is a partial longitudinal sectional view schematically showing a conventional capacitance type input device
- FIG. 10 is a partial plan view of a lower electrode pattern and an upper electrode pattern provided in a sensor section of the conventional input device. .
- the capacitive input device 1 includes a lower substrate 2 having a lower electrode pattern formed on the surface, an upper substrate 3 having an upper electrode pattern formed on the surface, and an operation surface 4a on the surface. And a surface member 4 provided.
- the sensor unit 5 includes a lower substrate 2 and an upper substrate 3.
- the surface member 4 is provided on the upper surface side of the sensor unit 5, and the surface member 4 and the sensor unit 5 are joined via an adhesive layer 40.
- the operation surface 4a of the surface member 4 is formed as a convex curved surface.
- the lower substrate 2 and the upper substrate 3 constituting the sensor unit 5 are formed in a planar shape. Therefore, the distance L1 in the height direction (Z) between the finger F and the sensor unit 5 when the finger F is brought into contact with the operation surface 4a differs depending on the contact position of the finger F on the operation surface 4a. ing.
- the finger F shown in FIG. 9 is in contact with the operation surface 4a at the position where the distance L1 is the largest.
- the plurality of lower electrode patterns 6 and the plurality of upper electrode patterns 7 are arranged so as to cross each other.
- the pattern widths T1 of the lower electrode patterns 6 are all the same size, and similarly, the pattern widths T2 of the upper electrode patterns 7 are all the same size.
- the lower electrode pattern 6 shown in FIG. 10 is a drive electrode
- the upper electrode pattern 7 is a detection electrode.
- FIG. 9 when the finger F (operation body) that is a conductor touches the operation surface 4 a, in the vicinity of the finger F, the electrostatic capacitance generated at the crossing position between the upper and lower electrode patterns 6 and 7 becomes Since the capacitance generated between the finger F and the sensor unit 5 is taken into account, the capacitance changes between when the finger F is touched and when the finger F is not touched. Therefore, in a state where a pulse-like voltage is applied to the lower electrode pattern 6 that is a driving electrode, a change in the time constant of each upper electrode pattern 7 is sequentially detected, and a continuous detection of this time constant change is performed on each lower electrode pattern. By applying the voltage to the pattern 14 in order, the position touched by the finger F on the operation surface 4a can be calculated.
- the distance L1 in the height direction (Z) between the finger F and the sensor unit 5 varies depending on the contact position of the finger F.
- the capacitance C11 generated between the finger F and the sensor unit 5 differs depending on the contact position of the finger F, but the capacitance C1 at each intersection position 8 between the electrode patterns 7 and 8 is independent of the location. Since it is constant, the change in capacitance when the finger F is brought into contact with the operation surface 4a varies depending on the contact position of the finger F, and there is a problem that uniform sensor sensitivity cannot be obtained.
- the curved sensor portion 5 it is very difficult to form the curved sensor portion 5 appropriately and stably.
- the sensor unit 5 formed in a planar form as shown in FIG. Cannot be bent into a curved surface shape (with no wrinkles). Or even if it uses the base material shape
- the structure of the input device described in Patent Documents 1 to 3 is the conventional structure shown in FIG. Note that the input devices described in Patent Documents 2 and 3 constitute a resistance-type input device instead of an electrostatic capacitance type ([0002] column of Patent Document 2 and [0003] column of Patent Document 3).
- the present invention is for solving the above-described conventional problems, and in particular, by adjusting the overlapping area at the intersection of the lower electrode pattern and the upper electrode pattern based on the distance from the operation surface to the sensor unit. It is an object of the present invention to provide a capacitance type input device that improves the uniformity of sensor sensitivity over the entire operation surface easily and appropriately.
- the capacitance type input device in the present invention is: A plurality of lower electrode patterns and a plurality of upper electrode patterns formed at intervals in the height direction are arranged so as to intersect in plan view, and an intersection position between the lower electrode pattern and the upper electrode pattern A sensor part formed with a capacitance, and a surface member disposed in opposition to the sensor part in the height direction and having an operation surface on the surface, The operation surface is curved so that a distance in a height direction between the operation body and the sensor unit when the operation body is brought into contact with the operation surface varies depending on a contact position of the operation body on the operation surface. Formed with The overlapping area between the lower electrode pattern and the upper electrode pattern at the intersection position is smaller as the distance between the operation surface and the sensor unit is larger.
- the capacitance at the intersection of each lower electrode pattern and each upper electrode pattern can be reduced as the distance between the operation surface and the sensor unit increases, and the operation body such as a finger can be placed at a different position on the operation surface. It is possible to suppress variation in capacitance change at the time of contact as compared with the conventional case, and it is possible to easily and appropriately improve the uniformity of sensor sensitivity over the entire operation surface.
- the sensor portion can be formed in a planar shape (flat plate shape) by adjusting the overlapping area at the intersection position between the electrode patterns as described above, the sensor portion is formed as shown in FIG. Compared to the case of forming a curved surface, the sensor part can be formed easily and appropriately. Therefore, it is possible to easily and stably manufacture an input device with excellent uniformity of sensor sensitivity on the entire operation surface. It is.
- the ratio of the overlapping area at each intersection position is inversely proportional to the ratio of the distance between the operation surface and the sensor unit at each intersection position.
- each lower electrode pattern is arranged with an interval in the first direction, and is formed to extend in a second direction intersecting the first direction
- Each upper electrode pattern is spaced apart in the second direction and is formed to extend in the first direction, respectively.
- the operation surface is formed in a convex curved surface or a concave curved surface toward at least one of the first direction and the second direction
- the pattern width of each electrode pattern formed in the same direction as the curved surface direction of the operation surface is preferably formed so as to decrease as the distance between the operation surface and the sensor unit increases.
- the side surfaces of each electrode pattern located on both sides of the pattern width can be formed in a curved shape.
- each electrode pattern can be formed in a simple shape, and the overlapping area at each intersection position can be adjusted appropriately and easily so as to decrease as the distance between the operation surface and the sensor unit increases. Is possible.
- the surface member can be preferably applied to a configuration in which the surface member is disposed on the upper surface side of the sensor unit, the lower electrode pattern is a drive electrode, and the upper electrode pattern is a detection electrode.
- the input device of the present invention it is possible to improve the uniformity of sensor sensitivity over the entire operation surface as compared with the conventional case.
- FIG. 1 An exploded perspective view of the input device of the present embodiment, It is a figure for demonstrating the surface member in this embodiment, a lower electrode pattern, and an upper electrode pattern, (a) is a top view of a surface member and a surface member along an AA line and a BB line (B) is a plan view of the lower electrode pattern, (c) is a plan view of the upper electrode pattern, and (d) is a lower electrode pattern of (b) and an upper electrode pattern of (c).
- a plan view of the 2A and 2B are views for explaining a surface member, a lower electrode pattern, and an upper electrode pattern in an embodiment different from FIG. 2 ((a) is a plan view and cross-sectional view, and (b) to (d) are plan views); FIGS.
- FIGS. 2A and 2B are diagrams for explaining a surface member, a lower electrode pattern, and an upper electrode pattern in another embodiment different from FIGS. 2 and 3
- FIGS. 2A is a plan view and a cross-sectional view
- FIGS. 2B to 2D are plan views
- FIGS. 2A to 2D are views for explaining a surface member, a lower electrode pattern, and an upper electrode pattern in another embodiment
- FIG. 2A is a plan view and a sectional view
- FIGS. 2B to 4D are plan views.
- FIG. 2 is a partially enlarged plan view showing an electrode pattern different from those shown in FIGS.
- FIG. 1 is a partial longitudinal sectional view when the input device of the present embodiment shown in FIG.
- FIG. 1 is cut along the X1-X2 direction;
- the fragmentary longitudinal cross-section of the input device of this embodiment using the surface member different from FIG. A partial longitudinal sectional view schematically showing a conventional capacitance type input device, A partial plan view of a lower electrode pattern and an upper electrode pattern provided in a sensor unit of a conventional input device,
- FIG. 10 is a partial longitudinal sectional view schematically showing a conventional capacitance type input device having a different form from FIG. 9.
- FIG. 1 is an exploded perspective view of a capacitance-type input device (touch panel) 10 according to the present embodiment
- FIG. 2 is a diagram for explaining a surface member, a lower electrode pattern, and an upper electrode pattern in the present embodiment.
- (A) is a plan view of the surface member, and a cross-sectional view when the surface member is cut along the lines AA and BB
- (b) is a plan view of the lower electrode pattern
- (c) is The top view of an upper electrode pattern
- (d) is a top view of the state which accumulated the lower electrode pattern of (b), and the upper electrode pattern of (c).
- 3 to 5 show an embodiment different from that shown in FIG. FIG.
- FIG. 6 is a partially enlarged plan view showing an electrode pattern different from those shown in FIGS. 7 is a partial longitudinal sectional view of the input device of this embodiment shown in FIG. 1 cut along the X1-X2 direction, and FIG. 8 is a portion of the input device of this embodiment using a surface member different from FIG. It is a longitudinal cross-sectional view.
- the input device 10 includes a lower substrate 22 having a plurality of lower electrode patterns formed on the surface of the base material, an adhesive layer 30, and an upper portion having a plurality of upper electrode patterns formed on the surface of the base material.
- the substrate 21, the adhesive layer 31, and the surface member 20 having the operation surface 20a on the surface are laminated in this order.
- Each lower electrode pattern and each upper electrode pattern are formed in a region facing the operation surface 20a in the height direction, and each electrode pattern is a wiring portion at the outer peripheral portion 12 of each substrate 21, 22 from the region facing the operation surface 20a. It is connected to the.
- a flexible printed circuit board 23 is provided in the input device 10 of the present embodiment.
- the tip of the flexible printed circuit board 23 (the connection side with the connection parts 15 and 17) is separated into a central part 23 a and both side end parts 23 b and 23 b.
- a plurality of first connection portions (not shown) are formed in the central portion 23a of the flexible printed circuit board 23, and the central portion 23a is overlaid on the upper connection portion 15 so that each first connection portion and each upper connection portion is overlapped. 15 is electrically connected.
- a plurality of second connection portions are formed on both side end portions 23b of the flexible printed circuit board 23, and both side end portions 23b, 23b are overlapped on the lower connection portion 17 of the input device 10, Each 2nd connection part and each lower connection part 17 are electrically connected.
- each first connection part and each second connection part are electrically connected to a connector 35 installed on the surface of the flexible printed circuit board 23 via a wiring pattern (not shown).
- the surface of the surface member 20 is an operation surface 20a by an operation body such as a finger F or a pen.
- the decorative layer 24 is provided on the outer peripheral portion of the operation surface 20 a and on the lower surface of the surface member 20.
- the operation surface 20a is a light-transmitting region, and the outer peripheral portion of the operation surface 20a on which the decoration layer 24 is formed is a non-light-transmitting region.
- FIG. 7 is a partial longitudinal sectional view of the input device 10 shown in FIG. 1 cut along the X1-X2 direction in the height direction.
- the lower substrate 22 includes a planar lower base material 32 and a plurality of lower electrode patterns 14 formed on the surface of the lower base material 32.
- the upper substrate 21 includes a planar upper base material 33 and a plurality of upper electrode patterns 13 formed on the surface of the upper base material 33.
- the plurality of lower electrode patterns 14 and the plurality of upper electrode patterns 13 intersect in plan view.
- the lower electrode pattern 14 is a drive electrode (drive electrode), and the upper electrode pattern 13 is a detection electrode.
- the lower substrate 22 and the upper substrate 21 are bonded via an adhesive layer 30.
- the lower substrate 22, the adhesive layer 30 and the upper substrate 21 constitute a sensor unit 25.
- the configuration of the sensor unit 25 is not limited to the structure shown in FIG.
- the structure etc. which formed the lower electrode pattern 14 and the upper electrode pattern 13 in the upper and lower surfaces of a planar base material may be sufficient.
- the lower substrate 22 and the upper substrate 21 may be joined with the upper electrode pattern 13 facing the adhesive layer 30 side.
- the electrode patterns 13 and 14 are both formed on the surface of the substrate by sputtering or vapor deposition with a transparent conductive material such as ITO (IndiumInTin ⁇ Oxide).
- the base materials 32 and 33 are formed of a film-like transparent base material such as polyethylene terephthalate (PET) or a glass base material.
- PET polyethylene terephthalate
- the lower substrate 22 and the upper substrate 21 are formed in a planar shape and are not formed into a three-dimensional shape as shown in FIG. 11, so that the base materials 32 and 33 have not only a soft film but also a planar glass or the like. Can be used.
- the surface member 20 is bonded to the upper surface side of the sensor unit 25 via the adhesive layer 31.
- the adhesive layers 30 and 31 are an acrylic adhesive, a double-sided adhesive tape, or the like.
- the surface member 20 is not particularly limited in material, but is formed of glass, plastic or the like.
- the surface member 20 shown in FIG. 7 is formed so that the operation surface 20a is a convex curved surface.
- the surface shape of the surface member 20 shown in FIG. 1 is shown in FIG. 3A in order to make it easy to see that it is a curved surface in a perspective view.
- FIG. 2 shows the shapes of the surface member 20, the lower electrode pattern, and the upper electrode pattern in the first embodiment.
- FIG. 2A shows a plan view of the surface member 20 and a cross section taken along line AA and BB passing through the center O of the surface member 20. A part of the adhesive layer 31 under the surface member 20 as well as the surface member 20 is shown in the AA line cross section and the BB line cross section.
- the operation surface (surface) 20a of the surface member 20 is formed with a convex curved surface in the Y1-Y2 direction (first direction) and the X1-X2 direction (second direction).
- the operation surface 20a in this embodiment has a 3D shape in which the center O protrudes most upward and is gradually curved downward as the distance from the center O increases.
- FIG. 2B is a plan view of the lower electrode pattern 14. As shown in FIG. 2B, a plurality of lower electrode patterns 14a to 14d are formed.
- each lower electrode pattern and each upper electrode pattern is denoted by “reference numerals 14 a, 14 b... 13b, ... ".
- the lower electrode patterns 14a to 14d are arranged with a space in the Y1-Y2 direction and are formed to extend in the X1-X2 direction, respectively.
- Each of the lower electrode patterns 14a to 14d has the narrowest pattern width (dimension in the Y1-Y2 direction) at the center in the X1-X2 direction, and the pattern width gradually increases from the center toward the X1-X2 direction. It is formed in a larger shape.
- FIG. 2B also shows the center O of the operation surface 20a of the surface member 20 in plan view.
- the lower electrode patterns 14a and 14b and the lower electrode patterns 14c and 14d are formed point-symmetrically with respect to the center O. That is, the lower electrode pattern 14a and the lower electrode pattern 14d are formed in the same shape, and the lower electrode pattern 14b and the lower electrode pattern 14c are formed in the same shape.
- the pattern shapes of the lower electrode patterns 14a to 14d will be described in more detail.
- the pattern width at the center in the X1-X2 direction of the lower electrode patterns 14a, 14d is formed by T3, and the pattern width at the center in the X1-X2 direction of the lower electrode patterns 14b, 14c is formed by T4.
- the pattern width T4 is formed smaller than the pattern width T3.
- the pattern widths of the lower electrode patterns 14a to 14d gradually increase as they move away from the positions of the pattern widths T3 and T4 in the X1-X2 direction.
- the pattern width T6 of the lower electrode patterns 14b and 14c is formed to be always smaller at the same position in the Y1-Y2 direction than the pattern width T5 of the lower electrode patterns 14a and 14d.
- both side portions 14m located on both sides of the pattern width of each of the lower electrode patterns 14a to 14d are formed to be curved.
- FIG. 2C is a plan view of the upper electrode pattern 13. As shown in FIG. 2C, a plurality of upper electrode patterns 13a to 13d are formed. As shown in FIG. 2C, each of the upper electrode patterns 13a to 13d is arranged with an interval in the X1-X2 direction and is formed to extend in the Y1-Y2 direction. Each of the upper electrode patterns 13a to 13d has the narrowest pattern width at the center in the Y1-Y2 direction (dimension in the X1-X2 direction), and gradually increases from the center toward the Y1-Y2 direction. Is formed in a shape that increases. FIG. 2C also shows the center O of the surface member 20 in plan view. In the embodiment shown in FIG.
- the upper electrode patterns 13a and 13b and the upper electrode patterns 13c and 13d are formed point-symmetrically with respect to the center O. That is, the upper electrode pattern 13a and the upper electrode pattern 13d are formed in the same shape, and the upper electrode pattern 13b and the upper electrode pattern 13c are formed in the same shape.
- the pattern shapes of the upper electrode patterns 13a to 13d will be described in more detail.
- the pattern width at the center in the Y1-Y2 direction of the upper electrode patterns 13a, 13d is formed by T7
- the pattern width at the center in the Y1-Y2 direction of the upper electrode patterns 13b, 13c is formed by T8.
- the pattern width T8 is formed smaller than the pattern width T7.
- the pattern widths of the upper electrode patterns 13a to 13d gradually increase as they move away from the positions of the pattern widths T7 and T8 in the Y1-Y2 direction.
- the pattern width T10 of the upper electrode patterns 13b and 13c is formed to be always smaller than the pattern width T9 of the upper electrode patterns 13a and 13d at the same position in the X1-X2 direction.
- both side portions 13m located on both sides of the pattern width of each of the upper electrode patterns 13a to 13d are curved.
- FIG. 2D is a plan view in which the plurality of lower electrode patterns 14a to 14d shown in FIG. 2B and the plurality of upper electrode patterns 13a to 13d shown in FIG. As shown in FIG. 7, an adhesive layer 30 and a base material 33 are interposed between the lower electrode patterns 14a to 14d and the upper electrode patterns 13a to 13d, and the lower electrode patterns 14a to 14d and the upper electrode patterns 13a to 13d are interposed. There is a predetermined gap in the height direction between 13d.
- the lower electrode patterns 14a to 14d and the upper electrode patterns 13a to 13d intersect at a plurality of positions in plan view.
- the overlapping area at each of the intersection positions 16a to 16p becomes smaller as the center O of the surface member 20 is approached. That is, the overlapping area at each intersection position 16 is formed smaller as the distance L2 in the height direction (Z) between the operation surface 20a and the sensor unit 25 shown in FIG. Therefore, the overlapping area at the intersection positions 16f, 16g, 16j, and 16k closest to the center O is the smallest, and the overlapping area at the intersection positions 16a, 16d, 16m, and 16p farthest from the center O is the largest.
- the “distance L2” is defined by the distance between the operation surface 20a and the upper electrode pattern 13 of the sensor unit 25.
- the overlapping area at each of the intersecting positions 16a to 16p can be adjusted as described above, as shown in FIGS. 2 (b) and 2 (c).
- the lower electrode patterns 14a to 14d and the upper electrode patterns This is because the pattern widths 13a to 13d are formed so as to be smaller as they are closer to the center O of the surface member 20.
- a pulsed voltage is sequentially applied to each lower electrode pattern 14 that is a drive electrode, and at this time, a current flows instantaneously through the upper electrode pattern 13.
- a finger F operation body
- Capacitance is added between the finger F and the sensor unit 25, and a capacitance change occurs between when the finger F is touched and when the finger F is not touched.
- the electrostatic capacitance at each of the intersecting positions 16a to 16p is made smaller as the distance L2 between the operation surface 20a and the sensor unit 25 becomes larger.
- the capacitances C3 to C10 generated at the respective intersection positions between the electrode patterns shown in FIG. 7 are: capacitance C3 ⁇ capacitance C4, C8 ⁇ capacitance C5, C9 ⁇ capacitance C6. C10 ⁇ capacitance C7.
- the capacitance at each of the intersecting positions 16a to 16p between the electrode patterns 13 and 14 is also adjusted to be smaller. Therefore, when the finger F comes into contact with the operation surface 20a In addition, it is possible to suppress the change in capacitance (change rate) that occurs in the vicinity of the finger F from varying depending on the contact location, and it is possible to improve the uniformity of sensor sensitivity.
- the input device 10 having the operation surface 20a formed in a curved surface can be appropriately and easily manufactured as compared with the conventional method, and the operation surface 20a. It is possible to effectively improve the uniformity of the overall sensor sensitivity.
- FIG. 3 shows the shapes of the surface member 20, the lower electrode pattern, and the upper electrode pattern in the second embodiment.
- FIG. 3A shows a plan view of the surface member 20 and a cross section taken along line AA and BB passing through the center O of the surface member 20. A part of the adhesive layer 31 under the surface member 20 as well as the surface member 20 is shown in the AA line cross section and the BB line cross section.
- the operation surface (surface) 20a of the surface member 20 is formed as a convex curved surface in the X1-X2 direction and linearly formed in the Y1-Y2 direction.
- the line in the Y1-Y2 direction passing through the center O of the operation surface 20a protrudes most upward, and gradually moves downward as it moves away from the line in the Y1-Y2 direction passing through the center O in the X1-X2 direction. It is formed in a curved shape.
- FIG. 3B is a plan view of the lower electrode pattern 14.
- Each of the lower electrode patterns 14e to 14h shown in FIG. 3B has the narrowest pattern width at the center in the X1-X2 direction, and the pattern width gradually increases from the center toward the X1-X2 direction. It is formed in the shape.
- the plurality of lower electrode patterns 14e to 14h all have the same pattern shape. That is, the pattern widths at the centers in the X1-X2 direction of the lower electrode patterns 14e to 14h are all formed by T11.
- the pattern width T12 that gradually increases from the position of the pattern width T11 of each lower electrode pattern 14e to 14h in the X1-X2 direction is the same at the same position in the Y1-Y2 direction of each lower electrode pattern 14e to 14h. It is formed to become. As shown in FIG. 3B, both side portions 14m located on both sides of the pattern widths of the lower electrode patterns 14e to 14h are formed to be curved.
- FIG. 3C is a plan view of the upper electrode pattern 13.
- a plurality of upper electrode patterns 13e to 13h are formed.
- each of the upper electrode patterns 13e to 13h is arranged with an interval in the X1-X2 direction and is formed to extend in the Y1-Y2 direction.
- the upper electrode patterns 13e and 13f and the upper electrode patterns 13g and 13h are formed point-symmetrically with respect to the center O. That is, the upper electrode pattern 13e and the upper electrode pattern 13h are formed in the same shape, and the upper electrode pattern 13f and the upper electrode pattern 13g are formed in the same shape.
- each of the upper electrode patterns 13e to 13h is formed in a band shape having a predetermined width, but the pattern width is narrower as the upper electrode pattern is closer to the center O of the surface member 20. That is, the pattern width T14 of the upper electrode pattern 13f and the upper electrode pattern 13g is formed smaller than the pattern width T13 of the upper electrode pattern 13e and the upper electrode pattern 13h.
- FIG. 3D is a plan view in which the plurality of lower electrode patterns 14e to 14h shown in FIG. 3B and the plurality of upper electrode patterns 13e to 13h shown in FIG. As shown in FIG. 3D, the lower electrode patterns 14e to 14h and the upper electrode patterns 13e to 13h intersect at a plurality of positions.
- the overlapping area at each of the intersecting positions 18a to 18p is formed smaller as the distance L2 in the height direction (Z) between the operation surface 20a and the sensor unit 25 shown in FIG.
- the operation surface 20a of the surface member 20 in FIG. 3 protrudes most on the line in the Y1-Y2 direction passing through the center O of the surface member 20, and gradually curves downward as it moves away from the line in the X1-X2 direction. Yes. That is, the distance L2 (see FIG. 7) between the operation surface 20a and the sensor unit 25 on the line is the largest, and the distance L2 gradually decreases as the distance from the line in the X1-X2 direction increases. Therefore, in FIG. 3D, the overlapping areas at the intersection positions 18b, 18c, 18f, 18g, 18j, 18k, 18n, and 18o that are equidistant from the line are the same area, whereas the intersection positions 18a and 18d.
- 18e, 18h, 18i, 18l, 18m, and 18p are formed so as to be larger and equal to the overlapping areas at the intersection positions 18b, 18c, 18f, 18g, 18j, 18k, 18n, and 18o. Yes.
- the lower electrode patterns 14e to 14h shown in FIG. 3B and the upper electrode patterns 13e to 13h shown in FIG. The shape and pattern width were adjusted.
- FIG. 4 shows the shapes of the surface member 20, the lower electrode pattern, and the upper electrode pattern in the third embodiment.
- FIG. 4A shows a plan view of the surface member 20 and a cross section taken along line AA and BB passing through the center O of the surface member 20. A part of the adhesive layer 31 under the surface member 20 as well as the surface member 20 is shown in the AA line cross section and the BB line cross section.
- the operation surface (surface) 20a of the surface member 20 is formed as a concave curved surface in the Y1-Y2 direction (first direction) and the X1-X2 direction (second direction).
- the In this embodiment, the center O of the operation surface 20a is recessed most downward, and is formed in a 3D shape that gradually curves upward as the distance from the center O increases.
- FIG. 4B is a plan view of the lower electrode pattern 14. As shown in FIG. 4B, a plurality of lower electrode patterns 14i to 14l are formed. As shown in FIG. 4B, each of the lower electrode patterns 14i to 14l is arranged with an interval in the Y1-Y2 direction and is formed to extend in the X1-X2 direction. Each of the lower electrode patterns 14i to 14l has the largest pattern width at the center in the X1-X2 direction, and is formed in a shape in which the pattern width gradually decreases toward the X1-X2 direction from the center. . FIG. 4B also shows the center O of the operation surface 20a of the surface member 20 in plan view. In the embodiment shown in FIG.
- the lower electrode patterns 14i and 14j and the lower electrode patterns 14k and 14l are formed point-symmetrically with respect to the center O. That is, the lower electrode pattern 14i and the lower electrode pattern 141 are formed in the same shape, and the lower electrode pattern 14j and the lower electrode pattern 14k are formed in the same shape.
- the pattern shapes of the lower electrode patterns 14i to 14l will be described in more detail.
- the pattern width at the center in the X1-X2 direction of the lower electrode patterns 14i, 14l is formed by T15
- the pattern width at the center in the X1-X2 direction of the lower electrode patterns 14j, 14k is formed by T16.
- the pattern width T15 is formed smaller than the pattern width T16.
- the pattern widths of the lower electrode patterns 14i to 14l gradually decrease as they move away from the positions of the pattern widths T15 and T16 in the X1-X2 direction.
- the pattern width T17 of the lower electrode patterns 14i, 14l is formed to be always smaller than the pattern width T18 of the lower electrode patterns 14j, 14k at the same position in the Y1-Y2 direction.
- both side portions 14m located on both sides of the pattern width of each of the lower electrode patterns 14i to 14l are formed to be curved.
- FIG. 4C is a plan view of the upper electrode pattern 13. As shown in FIG. 4C, a plurality of upper electrode patterns 13i to 13l are formed. As shown in FIG. 4C, each of the upper electrode patterns 13i to 13l is arranged with an interval in the X1-X2 direction and is formed to extend in the Y1-Y2 direction. Each of the upper electrode patterns 13i to 13l has the largest pattern width at the center in the Y1-Y2 direction, and is formed in a shape in which the pattern width gradually decreases toward the Y1-Y2 direction from the center. . FIG. 4C also shows the center O of the operation surface 20a of the surface member 20 in plan view. In the embodiment shown in FIG.
- the upper electrode patterns 13i, 13j and the upper electrode patterns 13k, 13l are formed point-symmetrically with respect to the center O. That is, the upper electrode pattern 13i and the upper electrode pattern 13l are formed in the same shape, and the upper electrode pattern 13j and the upper electrode pattern 13k are formed in the same shape.
- the pattern shapes of the upper electrode patterns 13i to 13l will be described in more detail.
- the pattern width at the center in the Y1-Y2 direction of the upper electrode patterns 13i, 13l is formed by T19, and the pattern width at the center in the Y1-Y2 direction of the upper electrode patterns 13j, 13k is formed by T20.
- the pattern width T19 is formed smaller than the pattern width T20.
- the pattern widths of the upper electrode patterns 13i to 13l gradually decrease as they move away from the positions of the pattern widths T19 and T20 in the Y1-Y2 direction.
- the pattern width T21 of the upper electrode patterns 13i and 13l is formed to be always smaller at the same position in the X1-X2 direction than the pattern width T22 of the upper electrode patterns 13j and 13k.
- both side portions 13m located on both sides of the pattern widths of the upper electrode patterns 13i to 13l are formed to be curved.
- FIG. 4D is a plan view in which the plurality of lower electrode patterns 14i to 14l shown in FIG. 4B and the plurality of upper electrode patterns 13i to 13l shown in FIG.
- the lower electrode patterns 14i to 14l and the upper electrode patterns 13i to 13l intersect at a plurality of positions.
- the overlapping area at each of the intersection positions 19a to 19p increases as the distance from the center O of the operation surface 20a of the surface member 20 increases, that is, the distance L2 in the height direction (Z) between the operation surface 20a and the sensor unit 25 (see FIG. 7; the operation surface 20a in FIG. 4 is a concave curved surface, whereas in FIG. 7, it is a convex curved surface, but the distance L2 is shown in FIG.
- the overlapping areas at the respective intersection positions 19a to 19p can be adjusted as described above, as shown in FIGS. 4 (b) and 4 (c), as shown in FIGS. 4 (b) and 4 (c). This is because the pattern widths 13i to 13l are formed so as to increase toward the center O of the operation surface 20a of the surface member 20.
- FIG. 5 shows the shapes of the surface member 20, the lower electrode pattern, and the upper electrode pattern in the fourth embodiment.
- FIG. 5A shows a plan view of the surface member 20, and a cross section taken along line AA and BB passing through the center O of the operation surface 20a of the surface member 20.
- FIG. A part of the adhesive layer 31 under the surface member 20 as well as the surface member 20 is shown in the AA line cross section and the BB line cross section.
- the operation surface (surface) 20a of the surface member 20 is formed as a concave curved surface in the X1-X2 direction, but is formed in a straight shape in the Y1-Y2 direction.
- the line in the Y1-Y2 direction passing through the center O of the operation surface 20a is recessed most downward, and gradually increases upward from the line in the Y1-Y2 direction passing through the center O in the X1-X2 direction. It is formed in a curved shape.
- FIG. 5B is a plan view of the lower electrode pattern 14.
- Each of the lower electrode patterns 14n to 14q shown in FIG. 5B has the widest pattern width at the center in the X1-X2 direction, and the pattern width gradually decreases from the center toward the X1-X2 direction. It is formed in the shape.
- the plurality of lower electrode patterns 14n to 14q all have the same pattern shape. That is, the pattern widths at the centers in the X1-X2 direction of the lower electrode patterns 14n to 14q are all formed by T23.
- the pattern width T24 that gradually decreases from the position of the pattern width T23 of each of the lower electrode patterns 14n to 14q in the X1-X2 direction is the same position in the Y1-Y2 direction of each of the lower electrode patterns 14n to 14q. It is formed to be the same. As shown in FIG. 5B, both side portions 14r located on both sides of the pattern widths of the lower electrode patterns 14n to 14q are formed to be curved.
- FIG. 5C is a plan view of the upper electrode pattern 13. As shown in FIG. 5C, a plurality of upper electrode patterns 13n to 13q are formed. As shown in FIG. 5C, each of the upper electrode patterns 13n to 13q is arranged with an interval in the X1-X2 direction and is formed to extend in the Y1-Y2 direction. Of the upper electrode patterns 13n to 13q, the upper electrode patterns 13n and 13o and the upper electrode patterns 13p and 13q are formed point-symmetrically with respect to the center O. That is, the upper electrode pattern 13n and the upper electrode pattern 13q are formed in the same shape, and the upper electrode pattern 13o and the upper electrode pattern 13p are formed in the same shape.
- each of the upper electrode patterns 13n to 13q is formed in a band shape having a predetermined width, but the pattern width is smaller as the upper electrode pattern is farther from the center O of the operation surface 20a of the surface member 20. It is formed. That is, the pattern width T25 of the upper electrode pattern 13n and the upper electrode pattern 13q is formed smaller than the pattern width T26 of the upper electrode pattern 13o and the upper electrode pattern 13p.
- FIG. 5 (d) is a plan view in which a plurality of lower electrode patterns 14n to 14q shown in FIG. 5 (b) and a plurality of upper electrode patterns 13n to 13q shown in FIG. 5 (c) are overlapped.
- the lower electrode patterns 14n to 14q and the upper electrode patterns 13n to 13q intersect at a plurality of positions.
- the overlapping area at each of the intersection positions 26a to 26p is formed to be smaller as the distance in the height direction (Z) between the operation surface 20a and the sensor unit 5 is larger.
- the operation surface 20a of the surface member 20 in FIG. 5 is most concave on a line in the Y1-Y2 direction passing through the center O, and gradually curves upward as it moves away from the line in the X1-X2 direction. That is, the distance between the operation surface 20a and the sensor unit 25 on the line is the smallest, and the distance gradually increases as the distance from the line in the X1-X2 direction increases.
- the overlapping areas at the intersection positions 26a, 26d, 26e, 26h, 26i, 26l, 26m, and 26p that are equidistant from the line are formed with the same area, and the intersection positions 26a, 26d, 26e, 26h, 26i,
- the overlapping areas at the intersection positions 16b, 26c, 26f, 26g, 26j, 26k, 26n, and 26o closer to the line in the Y1-Y2 direction passing through the center O than the positions 26l, 26m, and 26p are the intersection positions 26a, 26d, 26e, 26h, 26i, 26l, 26m, and 26p are larger than each overlapping area and have the same area.
- the lower electrode patterns 14n to 14q shown in FIG. 5B and the upper electrode patterns 13n to 13q shown in FIG. The shape and pattern width were adjusted.
- the distance in the height direction between the operation surface 20a and the sensor unit 25 is large. Indeed, by reducing the overlapping area at the intersection position between the electrode patterns 13 and 14, the uniformity of the sensor sensitivity in the entire operation surface 20a can be improved as compared with the conventional case.
- each overlapping area it is preferable to adjust each overlapping area so that the ratio of the overlapping area at each intersection position is inversely proportional to the ratio of the distance between the operation surface 20a and the sensor unit 25 at each intersection position. That is, if the distance B between the sensor units 25 at another position b on the operation surface 20a is twice the distance A with respect to the distance A between the sensor units 25 at a certain position a on the operation surface 20a.
- the overlap area S B at the intersection position at the position b is set to 1 ⁇ 2 of the overlap area S A at the intersection position at the position a.
- the magnitude of the capacitance is inversely proportional to the distance and proportional to the area.
- the capacitance generated between the sensor units 25 when the finger F is brought into contact with the position b is the electrostatic capacitance generated between the sensor units 25 when the finger F is brought into contact with the position a.
- the capacitance generated at the intersection position between the electrode patterns 13 and 14 at the position b is the same as that generated at the intersection position between the electrode patterns 13 and 14 at the position a.
- the operation surface 20a of the surface member 20 is formed as a convex curved surface or a concave curved surface in both the X1-X2 direction and the Y1-Y2 direction.
- the lower electrode patterns 14a to 14d and 14i to 14l and the both side portions 14m and 13m of the upper electrode patterns 13a to 13d and 13i to 13l are formed in a curved surface.
- the sensor portion 25 can be formed to be smaller as the distance is larger. Therefore, as shown in FIGS. 2E and 4E, the lower electrode patterns 14a to 14d and 14i to 14l and the intersecting positions 16a to 16p and 19a to 19p with the upper electrode patterns 13a to 13d and 13i to 13l. It is possible to easily and appropriately reduce each overlapping area at 1) as the distance between the operation surface 20a and the sensor unit 25 increases.
- each upper electrode pattern 13 is formed in a band shape having a predetermined width, while each lower electrode pattern 14 is formed with a constant width except for an intersection position 14 s with the upper electrode pattern 13. You can also. Then, the size of the intersection position 14a in each lower electrode pattern 14 is formed such that the overlapping area with the upper electrode pattern 13 decreases as the distance in the height direction between the operation surface 20a and the sensor unit 25 increases. Thereby, the larger the distance in the height direction between the operation surface 20a and the sensor unit 25, the smaller the capacitance generated at the intersection between each upper electrode pattern 13 and each lower electrode pattern 14, and the entire operation surface 20a. It is possible to improve the uniformity of sensor sensitivity.
- the surface member 20 is formed not only on the operation surface 20a but also on the back surface 20b facing the operation surface 20a in a curved shape following the shape of the operation surface 20a, as shown in FIG. Further, the back surface 20b may be formed as a flat surface.
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Abstract
Description
高さ方向に間隔を空けて形成された複数本の下部電極パターンと複数本の上部電極パターンとが平面視にて交差して配置され、前記下部電極パターンと前記上部電極パターン間での交差位置に静電容量が生じて成るセンサ部と、前記センサ部と高さ方向に対向して配置され、表面に操作面を備える表面部材と、を有して構成され、
前記操作面は、操作体を操作面上に接触させたときの前記操作体と前記センサ部間の高さ方向への距離が前記操作体の前記操作面上での接触位置により異なるように曲面を有して形成されており、
前記交差位置での前記下部電極パターンと前記上部電極パターンとの重なり面積は、前記操作面と前記センサ部間の距離が大きいほど小さく形成されていることを特徴とするものである。これにより、各下部電極パターンと各上部電極パターンとの交差位置での静電容量を、操作面とセンサ部間の距離が大きくなるほど小さくでき、指等の操作体を操作面上の異なる位置に接触させた際の容量変化のばらつきを従来に比べて抑制でき、操作面全体におけるセンサ感度の均一性を簡単且つ適切に向上させることが可能になる。本発明では、各電極パターン間の交差位置での重なり面積を上記のように調整することでセンサ部を平面形状(平板状)で形成することができるため、図11に示すようにセンサ部を曲面状に形成する場合等に比べてセンサ部を簡単且つ適切に形成することができ、よって、操作面全体におけるセンサ感度の均一性に優れた入力装置を簡単且つ安定して製造することが可能である。
各上部電極パターンは、前記第2の方向に間隔を空けて配置されるとともに、夫々、前記第1の方向に延出して形成されており、
前記操作面は前記第1の方向及び前記第2の方向の少なくともどちらか一方に向けて凸曲面あるいは凹曲面に形成されており、
前記操作面の曲面方向と同方向に形成された各電極パターンのパターン幅は、前記操作面と前記センサ部間の距離が大きいほど小さくなるように形成されていることが好ましい。このとき、前記パターン幅の両側に位置する各電極パターンの側面部を湾曲形状で形成することができる。これにより、簡単な形状にて各電極パターンを形成することができるとともに、各交差位置での重なり面積を、操作面とセンサ部間の距離が大きいほど小さくなるように適切且つ容易に調整することが可能である。
下部電極パターン14a,14dのX1-X2方向の中心でのパターン幅はT3で形成され、下部電極パターン14b,14cのX1-X2方向の中心でのパターン幅はT4で形成される。ここでパターン幅T4はパターン幅T3よりも小さく形成されている。各下部電極パターン14a~14dは、パターン幅T3,T4の位置からX1-X2方向に離れるにしたがって、徐々にパターン幅が広がる。このとき、下部電極パターン14b,14cのパターン幅T6は、下部電極パターン14a,14dのパターン幅T5より常にY1-Y2方向の同位置にて小さくなるように形成されている。図2(b)に示すように各下部電極パターン14a~14dのパターン幅の両側に位置する両側部14mは湾曲して形成されている。
上部電極パターン13a,13dのY1-Y2方向の中心でのパターン幅はT7で形成され、上部電極パターン13b,13cのY1-Y2方向の中心でのパターン幅はT8で形成される。ここでパターン幅T8はパターン幅T7よりも小さく形成されている。各上部電極パターン13a~13dは、パターン幅T7,T8の位置からY1-Y2方向に離れるにしたがって、徐々にパターン幅が広がる。このとき、上部電極パターン13b,13cのパターン幅T10は、上部電極パターン13a,13dのパターン幅T9より常にX1-X2方向の同位置にて小さくなるように形成されている。図2(c)に示すように各上部電極パターン13a~13dのパターン幅の両側に位置する両側部13mは湾曲して形成されている。
下部電極パターン14i,14lのX1-X2方向の中心でのパターン幅はT15で形成され、下部電極パターン14j,14kのX1-X2方向の中心でのパターン幅はT16で形成される。ここでパターン幅T15はパターン幅T16よりも小さく形成されている。各下部電極パターン14i~14lは、パターン幅T15,T16の位置からX1-X2方向に離れるにしたがって、徐々にパターン幅が小さくなる。このとき、下部電極パターン14i,14lのパターン幅T17は、下部電極パターン14j,14kのパターン幅T18より常にY1-Y2方向の同位置にて小さくなるように形成されている。図4(b)に示すように各下部電極パターン14i~14lのパターン幅の両側に位置する両側部14mは湾曲して形成されている。
上部電極パターン13i,13lのY1-Y2方向の中心でのパターン幅はT19で形成され、上部電極パターン13j,13kのY1-Y2方向の中心でのパターン幅はT20で形成される。ここでパターン幅T19はパターン幅T20よりも小さく形成されている。各上部電極パターン13i~13lは、パターン幅T19,T20の位置からY1-Y2方向に離れるにしたがって、徐々にパターン幅が小さくなる。このとき、上部電極パターン13i,13lのパターン幅T21は、上部電極パターン13j,13kのパターン幅T22より常にX1-X2方向の同位置にて小さくなるように形成されている。図4(c)に示すように各上部電極パターン13i~13lのパターン幅の両側に位置する両側部13mは湾曲して形成されている。
F 指
L2 距離
10 入力装置
13、13a~13q 上部電極パターン
14 14a~14q 下部電極パターン
20 表面部材
20a 操作面
20b 裏面
21 上部基板
22 下部基板
25 センサ部
16a~16p、18a~18p、19a~19p、26a~6p 交差位置
Claims (5)
- 高さ方向に間隔を空けて形成された複数本の下部電極パターンと複数本の上部電極パターンとが平面視にて交差して配置され、前記下部電極パターンと前記上部電極パターン間での交差位置に静電容量が生じて成るセンサ部と、前記センサ部と高さ方向に対向して配置され、表面に操作面を備える表面部材と、を有して構成され、
前記操作面は、操作体を操作面上に接触させたときの前記操作体と前記センサ部間の高さ方向への距離が前記操作体の前記操作面上での接触位置により異なるように曲面を有して形成されており、
前記交差位置での前記下部電極パターンと前記上部電極パターンとの重なり面積は、前記操作面と前記センサ部間の距離が大きいほど小さく形成されていることを特徴とする静電容量式の入力装置。 - 各交差位置での前記重なり面積の比率は、各交差位置における前記操作面と前記センサ部間の距離の比率に反比例している請求項1記載の静電容量式の入力装置。
- 各下部電極パターンは、第1の方向に間隔を空けて配置されるとともに、夫々、前記第1の方向に交差する第2の方向に延出して形成されており、
各上部電極パターンは、前記第2の方向に間隔を空けて配置されるとともに、夫々、前記第1の方向に延出して形成されており、
前記操作面は前記第1の方向及び前記第2の方向の少なくともどちらか一方に向けて凸曲面あるいは凹曲面に形成されており、
前記操作面の曲面方向と同方向に形成された各電極パターンのパターン幅は、前記操作面と前記センサ部間の距離が大きいほど小さくなるように形成されている請求項1又は2に記載の静電容量式の入力装置。 - 前記パターン幅の両側に位置する各電極パターンの側面部は湾曲して形成されている請求項3記載の静電容量式の入力装置。
- 前記表面部材は、前記センサ部の上面側に配置され、前記下部電極パターンが駆動電極で、前記上部電極パターンが検出電極である請求項1ないし4のいずれか1項に記載の静電容量式の入力装置。
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Also Published As
Publication number | Publication date |
---|---|
JP5390018B2 (ja) | 2014-01-15 |
KR101375476B1 (ko) | 2014-03-18 |
CN102893245A (zh) | 2013-01-23 |
CN102893245B (zh) | 2015-05-06 |
JPWO2011142332A1 (ja) | 2013-07-22 |
KR20120139826A (ko) | 2012-12-27 |
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