WO2015170607A1

WO2015170607A1 - Information display device

Info

Publication number: WO2015170607A1
Application number: PCT/JP2015/062469
Authority: WO
Inventors: 裕介清水; 良真吉岡
Original assignee: 日東電工株式会社
Priority date: 2014-05-08
Filing date: 2015-04-24
Publication date: 2015-11-12
Also published as: TW201606592A; JP2015215667A

Abstract

This information display device is capable of input with an input body such as a general writing implement, and moreover, is capable at the time of said input of identifying and detecting the tip input portion of the input body even if said tip portion touches the display at the same time as the little finger of the hand holding said input body, the base of said finger, etc. This information display device is provided with an information display body (P) having a display (D), and a sheet-form optical waveguide (W) arranged on the surface of the display (D) and configuring a position sensor (A). In the sheet-form optical waveguide (W), a lattice-form core (2) is held between a sheet-form undercladding layer and an overcladding layer (3), and the modulus of elasticity of the core (2) is set greater than the modulus of elasticity of the undercladding layer and the modulus of elasticity of the overcladding layer (3). Further, intersections in the lattice-form core (2) are interrupted by gaps in at least one of the intersecting directions so are discontinuous.

Description

Information display device

The present invention relates to an information display device capable of writing a memo or the like on a display and simultaneously displaying the memo or the like as digital data (electronic data) on the display.

There are memo tools that digitally process memos and the like, such as an electronic memo processing device (see, for example, Patent Document 1). This is provided with a display for displaying a memo or the like to be input, and the memo or the like can be input to the display using a dedicated pen. In other words, the display is a touch panel that detects the tip of the dedicated pen, and the tip of the dedicated pen is brought into contact with the display and the dedicated pen is moved so that the movement locus of the tip of the dedicated pen is changed. It is converted into electronic data as a memo or the like, and is input to the display and displayed.

Also, tablet-type terminals and smartphones are equipped with a display so that they can be input with a fingertip instead of the dedicated pen. That is, the display in the tablet-type terminal or the like is a touch panel that senses a weak current (change in the capacitance of the human body) that occurs when touched with a fingertip. By moving the fingertip, the movement trajectory of the fingertip is converted into electronic data such as a memo, and is input to the display and displayed.

Japanese Patent No. 3746378

However, none of the above displays can be input with a general writing instrument such as a pen that emits ink, or a simple elongated rod-like body that does not eject ink.

Also, in the above display of the type that is input with the fingertip, if a plurality of parts of the human body (for example, the fingertip and the hand) are touching the display at the same time, the contact portion cannot be specified, and the input should be performed appropriately. I can't.

The present invention has been made in view of such circumstances, and can be input with an input body such as a general writing instrument. In addition, at the time of the input, the tip input section of the input body and the input body It is an object of the present invention to provide an information display device that can identify and detect the tip input portion even when the little finger of the hand holding it or the base portion of the hand touches the display at the same time.

In order to achieve the above object, an information display device according to the present invention is an information display device comprising a display for displaying information and a position sensor of (A) below, and the position of the position on the surface of the display. A sheet-like optical waveguide of the sensor is placed, and the movement trajectory of the tip input portion of the input body on the surface of the sheet-like optical waveguide is displayed on the display as input information.
(A) A sheet-like optical waveguide having a plurality of linear cores formed in a lattice shape, an under cladding layer that supports the cores, and an over cladding layer that covers the cores, and one end surface of the core The movement locus of the tip input portion of the input body on the surface of the sheet-shaped optical waveguide is changed by the amount of light propagation of the core changed by the movement, the light emitting element to be connected, the light receiving element connected to the other end surface of the core A position sensor having a moving locus specifying means for specifying, wherein at least one direction where a part or all of the lattice-like intersection formed by the plurality of linear cores intersects is divided by a gap. The sheet is formed at discontinuous intersections, and the elastic modulus of the core is set to be larger than the elastic modulus of the under-cladding layer and the elastic modulus of the over-cladding layer, and the sheet A pressing state by the tip input section in the surface of the optical waveguide, the deformation ratio of the cross-section of the pressing direction of the core, a position sensor adapted to be smaller than the deformation rate of the cross-section of the over-cladding layer and the under-cladding layer.

In the present invention, the “deformation rate” refers to the ratio of the amount of change of each thickness during pressing to the thickness of the core, over cladding layer and under cladding layer before pressing in the pressing direction. The “movement” of the pen tip includes a case where the movement distance is 0 (zero), and the “movement locus” in that case is a point.

In the sheet-like optical waveguide, a part or all of the lattice-like intersection formed by the plurality of linear cores is formed as a discontinuous intersection in a state where at least one intersecting direction is divided by a gap. The cross loss of light can be reduced. The present inventors have obtained such knowledge.

The information display apparatus according to the present invention includes a sheet-like optical waveguide in which a plurality of linear cores are arranged and formed in a lattice shape as a detection means for a movement locus of a tip input portion (a pen tip or the like) of an input body (a pen or the like). The provided position sensor is used. That is, the movement trajectory of the pen tip on the surface of the sheet-shaped optical waveguide is specified by the light propagation amount of the core changed by the movement. Therefore, a dedicated pen is not required for input, and a general writing instrument such as a pen that emits ink or a simple elongated rod-like body that does not eject ink can be used as the input body. In the sheet-like optical waveguide, the elastic modulus of the core is set larger than the elastic modulus of the under cladding layer and the elastic modulus of the over cladding layer. Therefore, when the surface of the over clad layer of the sheet-like optical waveguide is pressed, the deformation rate of the cross section of the core in the pressing direction is smaller than the deformation rate of the cross section of the over clad layer and the under clad layer. The cross-sectional area of the core is maintained. Then, when information such as characters is input by moving the tip input portion of the input body on the surface of the sheet-shaped optical waveguide, the bending state of the core is input to the tip of the input body at the pressed portion by the tip input portion. As a result, the light leaks (scatters) from the core, and at the pressed part of the hand part holding the input body, the bending of the core becomes gentle along the hand. It is possible to prevent leakage (scattering). Therefore, in the core pressed by the tip input part such as the pen tip, the detection level (light reception amount) of the light in the light receiving element is reduced, and in the core pressed by the hand part having the input body, the detection level is It can be prevented from decreasing. Then, the position (coordinates) of the tip input portion such as the pen tip can be detected by the movement locus specifying means from the decrease in the detection level of the light, and the part of the hand where the detection level does not decrease is pressed. Since it becomes the same as a non-existing state, it can be prevented from being detected. In addition, part or all of the lattice-like intersection formed by the core is formed as a discontinuous intersection in a state in which at least one intersecting direction is divided by a gap, thereby reducing the light intersection loss. be able to. Therefore, the detection sensitivity of the position of the tip of the pen tip or the like can be increased. As a result, the information display device of the present invention can detect only the movement locus (information of inputted characters and the like) of the tip input unit such as a pen tip and display the detected movement locus on the display.

It is explanatory drawing which shows typically one Embodiment of the information display apparatus of this invention. It is a top view which shows typically the position sensor which comprises the said information display apparatus. (A) is an enlarged plan view schematically showing an intersection of lattice-shaped cores in the position sensor, and (b) is an enlarged schematic view of a cross section of a central portion of the position sensor. It is an expanded sectional view shown. (A) is an enlarged plan view schematically showing a light path in a continuous intersection, and (b) is an enlarged plan view schematically showing a light path in a discontinuous intersection. (A) is sectional drawing which shows typically the state of the sheet-like optical waveguide of the said position sensor pressed by the input body, (b) is typical about the state of the said sheet-like optical waveguide pressed by the hand. FIG. (A)-(e) is an enlarged plan view which shows typically the modification of the cross | intersection part of the said grid | lattice-like core.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the information display device of the present invention. The information display device of this embodiment includes an information display body P having a quadrangular display D, and a position sensor A placed on the surface of the display D. Information such as characters input with the input body 10 such as a pen on the surface of the position sensor A is displayed on the display D.

The information display body P is a computer having a display D such as a liquid crystal display for information display or an organic EL display, such as a tablet terminal, a smart phone, or a notebook personal computer.

As shown in FIG. 2, the position sensor A has a rectangular sheet-like optical waveguide W having a lattice-like core 2 and one end face of the linear core 2 constituting the lattice-like core 2. And a light receiving element 5 connected to the other end face of the linear core 2. The light emitted from the light emitting element 4 passes through the core 2 and is received by the light receiving element 5. In FIG. 2, the core 2 is indicated by a chain line, and the thickness of the chain line indicates the thickness of the core 2. In FIG. 2, the number of cores 2 is omitted. Furthermore, the arrow in FIG. 2 indicates the direction in which the light travels.

In this embodiment, the light-emitting element 4 and the light-receiving element 5 are controlled by a CPU (Central Processing Unit) (not shown), and the CPU together with the light-emitting element 4 and the light-receiving element 5 is a circuit board ( (Not shown). The circuit board on which the CPU and the like are mounted is arranged inside the information display body P (see FIG. 1). Therefore, the CPU, the light emitting element 4, the light receiving element 5, and the circuit board are not shown in FIG. Further, the power source required for the light emitting element 4 and the CPU uses the power source provided in the information display body P.

In this embodiment, each of the intersecting portions of the lattice-like core 2 in the sheet-like optical waveguide W is crossed by gaps G as shown in a plan view in FIG. Divided and discontinuous. The width d of the gap G exceeds 0 (zero) (if the gap G is formed) and is usually set to 20 μm or less. In the sheet-like optical waveguide W, the lattice-like core 2 is supported by the sheet-like under clad layer 1 and covered with the sheet-like over clad layer 3 as shown in a sectional view in FIG. The undercladding layer 1 is in contact with the surface of the display D. In this embodiment, the gap G is formed of a material for forming the over clad layer 3.

Thus, in the lattice-like core 2 described above, if the intersection is discontinuous, the light crossing loss can be reduced. That is, as shown in FIG. 4 (a), in an intersection where all four intersecting directions are continuous, if one of the intersecting directions [upward in FIG. 4 (a)] is focused, the light incident on the intersection Part of the light reaches the wall surface 2a of the core 2 orthogonal to the core 2 through which the light has traveled, and is transmitted through the core 2 because the reflection angle at the wall surface 2a is large [2 in FIG. (See dotted arrow). Such light transmission also occurs in a direction opposite to the above intersecting direction (downward in FIG. 4A). On the other hand, as shown in FIG. 4B, when the intersecting one direction [upward in FIG. 4B] is discontinuous by the gap G, the interface between the gap G and the core 2 is Part of the light that is formed and passes through the core 2 in FIG. 4 (a) has a smaller reflection angle at the interface, so that it is reflected at the interface without passing through and continues to travel through the core 2 [FIG. 4 (b), see the two-dot chain line arrow]. Such reflection of light also occurs in the direction opposite to the above intersecting direction (downward in FIG. 4B). For this reason, as described above, when the crossing portion is discontinuous, the light crossing loss can be reduced.

In the sheet-like optical waveguide W, the elastic modulus of the core 2 is set larger than the elastic modulus of the under cladding layer 1 and the elastic modulus of the over cladding layer 3. Thereby, when the surface of the said sheet-like optical waveguide W is pressed, the deformation rate of the cross section of the core 2 of the pressing direction becomes smaller than the deformation rate of the cross section of the over clad layer 3 and the under clad layer 1. It has become.

In the information display device having such a configuration, a portion of the sheet-shaped optical waveguide W corresponding to the lattice-shaped core 2 is an input region. Then, input of information to the sheet-like optical waveguide W by the input body 10 (see FIG. 1) such as a pen is performed so that the overcladding layer 3 is written such that letters are written on the surface of the overcladding layer 3 in the input region. This is performed by moving the tip input portion (pen nib etc.) 10a (see FIG. 1) of the input body 10 on the surface of the input body 10. That is, as shown in cross-sectional views in FIGS. 5A and 5B, information such as characters is input to the surface of the over-cladding layer 3 of the sheet-like optical waveguide W by an input body 10 such as a pen held in the hand 20. And the like, the pressing portion by the tip input section 10a such as a pen tip (see FIG. 5A) is also the pressing portion by the little finger of the hand 20 or its base portion (the little finger ball) [FIG. 5B]. Also, in the cross section in the pressing direction, the over clad layer 3 having a small elastic modulus is deformed so that the core 2 having a large elastic modulus is a portion of the tip input portion 10a or the hand 20 while maintaining the cross-sectional area. And bent so as to sink into the under-cladding layer 1 having a small elastic modulus.

And in the press part by the front-end | tip input part 10a, as shown to Fig.5 (a), since the front-end | tip input part 10a is sharp, the bending condition of the core 2 becomes abrupt and the light from the core 2 is light. Leakage (scattering) occurs [see the two-dot chain arrow in FIG. 5A]. On the other hand, in the pressing portion by the hand 20 having the input body 10, as shown in FIG. 5B, the hand 20 is considerably larger and rounder than the tip input portion 10a. The bending becomes gradual and the light leakage (scattering) does not occur (the light travels without leaking through the core 2) (see the two-dot chain arrow in FIG. 5B). Therefore, the detection level of light at the light receiving element 5 is lowered in the core 2 pressed by the tip input portion 10a, and the detection level is not lowered in the core 2 pressed by the hand 20 having the input body 10. can do. The position (coordinates) of the tip input portion 10a can be detected from the decrease in the light detection level. The portion of the hand 20 whose detection level does not decrease is the same as the state where it is not pressed, and thus is not detected.

At this time, as described above, since the lattice-like intersection formed by the core 2 is formed as a discontinuous intersection, the light intersection loss is reduced. The detection sensitivity of the position of the tip input unit 10a such as the pen tip is high.

Therefore, the tip input unit 10a is a signal obtained by tracing the position corresponding to the electric signal from the electric signal output from the light receiving element 5 based on the decrease in the light detection level at the light receiving element 5. A program (moving track specifying means) for specifying the moving track is incorporated. That is, the position sensor A is a sensor that detects the position of the tip input portion (pen tip etc.) 10a of the input body (pen etc.) 10 used for inputting information. Data indicating the movement trajectory of the tip input portion 10a of the input body 10 is output to the CPU (not shown) of the information display body P, and is appropriately imaged by the CPU of the information display body P. The movement trajectory is displayed on the display D.

As described above, in the information display device, a plurality of linear cores 2 are arranged and formed in a lattice pattern as means for detecting the movement trajectory of the tip input portion (pen tip etc.) 10a of the input body (pen etc.) 10. Since the sheet-like optical waveguide W is used, a dedicated pen is not required for input. As the input body 10, a general writing instrument such as a pen that emits ink or a simple elongated rod-like object that does not eject ink is used. Can be used.

Further, as described above, in the sheet-like optical waveguide W, the elastic modulus of the core 2 is set to be larger than the elastic modulus of the under cladding layer 1 and the elastic modulus of the over cladding layer 3, so that the input body Even if the hand 20 having 10 presses the sheet-like optical waveguide W, as described above, only the position of the tip input portion 10a can be detected, and the portion of the hand 20 can be prevented from being detected. In addition, since the intersections of the lattice-like cores 2 are formed as discontinuous intersections, it is possible to reduce the cross loss of light and increase the detection sensitivity of the position of the tip input unit 10a such as the pen tip. Can do.

Furthermore, at the time of input to the sheet-like optical waveguide W, the portion of the sheet-like optical waveguide W pressed by the tip input portion 10a of the input body 10 is deformed as described above. Can write well.

In addition, since the information display body P such as the tablet type terminal is normally provided with an information storage medium such as a memory in advance, the input information (information displayed on the display D) is stored in the information storage medium. Can be remembered.

When the pressure applied by the tip input portion 10a of the input body 10 is released (the tip input portion 10a moves or input such as writing ends), the under cladding layer 1, the core 2, and the over cladding layer 3 returns to the original state (see FIG. 3B) by its restoring force. The submerged depth L of the core 2 into the under cladding layer 1 is preferably up to 2000 μm. If the sinking depth L exceeds 2000 μm, the under cladding layer 1, the core 2, and the over cladding layer 3 may not return to the original state, or the sheet-like optical waveguide W may be cracked.

Here, the elastic modulus and the like of the core 2, the under cladding layer 1 and the over cladding layer 3 will be described in more detail.

The elastic modulus of the core 2 is preferably in the range of 1 GPa to 10 GPa, more preferably in the range of 2 GPa to 5 GPa. If the elastic modulus of the core 2 is too low, the shape of the tip input portion 10a such as a pen tip tends to prevent the cross-sectional area of the core 2 from being held by the pressure of the tip input portion 10a (the core 2 is crushed). There is a possibility that the position of the input unit 10a cannot be detected properly. On the other hand, if the elastic modulus of the core 2 is too high, the bending of the core 2 due to the pressure of the tip input portion 10a tends to be a gentle bend without becoming a sharp bend along the tip input portion 10a. Therefore, light leakage (scattering) from the core 2 does not occur, and the light detection level at the light receiving element 5 does not decrease, so that the position of the tip input portion 10a may not be detected properly. The dimensions of the core 2 are set, for example, within a range of 5 to 100 μm in thickness and within a range of 5 to 500 μm in width.

The elastic modulus of the over clad layer 3 is preferably in the range of 0.1 MPa to less than 10 GPa, more preferably in the range of 1 MPa to less than 5 GPa. If the elastic modulus of the over clad layer 3 is too low, the over clad layer 3 tends to be damaged by the pressure of the tip input portion 10a due to the shape of the tip input portion 10a such as a pen tip. May not be able to be protected. On the other hand, if the elastic modulus of the over clad layer 3 is too high, the over clad layer 3 tends not to be deformed so as to be crushed even by the pressure of the tip input portion 10a or the hand 20, thereby causing the core 2 to be crushed and the tip There is a possibility that the position of the input unit 10a cannot be detected properly. The thickness of the over clad layer 3 is set within a range of 1 to 200 μm, for example.

The elastic modulus of the under cladding layer 1 is preferably in the range of 0.1 MPa to 1 GPa, more preferably in the range of 1 MPa to 100 MPa. If the modulus of elasticity of the underclad layer 1 is too low, the underclad layer 1 is too soft and, after being pressed by the tip input part 10a such as a pen tip, the underclad layer 1 is difficult to return to its original state, and input tends not to be performed continuously. is there. On the other hand, if the modulus of elasticity of the underclad layer 1 is too high, the underclad layer 1 tends not to be deformed due to the pressure of the tip input portion 10a or the hand 20, so that the core 2 is crushed. There is a possibility that the position of the input unit 10a cannot be detected properly. Note that the thickness of the under-cladding layer 1 is set within a range of 20 to 2000 μm, for example.

As a material for forming the core 2, the under clad layer 1 and the over clad layer 3, it is necessary to view display information of the display D through the sheet-like optical waveguide W, so that a light-transmitting photosensitive resin, a thermosetting resin, etc. Can be given. And the sheet-like optical waveguide W can be produced with the manufacturing method according to the forming material. The refractive index of the core 2 is set larger than the refractive indexes of the under cladding layer 1 and the over cladding layer 3. The elastic modulus and refractive index can be adjusted by, for example, selecting the type of each forming material and adjusting the composition ratio.

Further, a light-transmitting elastic layer may be provided on the back surface of the under cladding layer 1. In this case, even if the restoring force of the under-cladding layer 1, the core 2 and the over-cladding layer 3 is weak, or the under-cladding layer 1 is originally made of a material having a weak restoring force, the elastic layer Using the elastic force, the weak restoring force is assisted, and after the pressing by the tip input portion 10a of the input body 10 is released, the original state can be restored.

Further, as described above, in order to detect only the position of the tip input unit 10a such as the pen tip and not to detect the hand 20 having the input body 10 such as a pen, a pressing portion by the tip input unit 10a is used. The amount of light leakage (scattering) due to the sharp bending of the core 2 is important. Therefore, for example, the ratio S (= R / T) between the radius of curvature R (unit: μm) of the tip input portion 10a such as a pen tip and the thickness T (unit: μm) of the core 2 is used, and the core 2 and under When the refractive index difference Δ between the cladding layer 1 and the over cladding layer 3 is defined, the maximum value Δmax of the refractive index difference Δ is expressed by the following equation (1). That is, if the refractive index difference Δ is larger than the maximum value Δmax, even if the tip input portion 10a is pressed, the amount of light leakage (scattering) is small and the light detection level at the light receiving element 5 is not sufficiently lowered. Therefore, it becomes difficult to distinguish between the position of the tip input portion 10a and the position of the hand 20.

On the other hand, the minimum value Δmin of the refractive index difference Δ is expressed by the following equation (2). That is, when the refractive index difference Δ is smaller than the minimum value Δmin, light leakage (scattering) occurs even in the pressed portion by the hand 20, and it is difficult to distinguish the position of the tip input portion 10a from the position of the hand 20. Become.

Therefore, the refractive index difference Δ is preferably set between the minimum value Δmin and the maximum value Δmax. Here, for example, the radius of curvature R (unit: μm) of the tip input portion 10a is in the range of 100 to 1000, the thickness T (unit: μm) of the core 2 is in the range of 10 to 100, and the ratio S is 1 to 1. If it is in the range of 100, the refractive index difference Δ is in the range of 1.0 × 10 ⁻³ to 7.95 × 10 ⁻² . When the ratio S exceeds 100, the minimum value Δmin is set to 1.0 × 10 ⁻³ (constant).

In the above embodiment, the crossing portion of the lattice-like core 2 is a discontinuous crossing (see FIG. 3A) in which all four intersecting directions are discontinuous (see FIG. 3A). It may be an intersection. For example, as shown in FIG. 6 (a), only one intersecting direction may be divided by the gap G to be discontinuous, or as shown in FIGS. 6 (b) and 6 (c), The two intersecting directions (FIG. 6 (b) is the two opposing directions, FIG. 6 (c) is the two adjacent directions) may be discontinuous, or as shown in FIG. 6 (d) The three directions may be discontinuous. Further, two or more kinds of the discontinuous intersection shown in FIG. 3 (a) and FIGS. 6 (a) to 6 (d) and a continuous intersection in which all four intersecting directions are continuous [see FIG. 6 (e)]. It is good also as the grid | lattice form provided with no intersection.

In the above embodiment, the CPU, the light emitting element 4, the light receiving element 5, and the circuit board are arranged inside the information display body P. However, all or a part of them may be arranged outside the information display body P. Good.

Next, examples will be described together with comparative examples. However, the present invention is not limited to the examples.

[Formation material of over clad layer]
Component a: 30 parts by weight of epoxy resin (Epogosei PT, manufactured by Yokkaichi Gosei Co., Ltd.)
Ingredient b: 70 weight part of epoxy resins (the Daicel company make, EHPE3150).
Component c: 4 parts by weight of a photoacid generator (manufactured by Sun Apro, CPI 200K).
Component d: 100 parts by weight of ethyl lactate (manufactured by Wako Pure Chemical Industries).
By mixing these components a to d, an over clad layer forming material was prepared.

[Core forming material]
Component e: 80 parts by weight of an epoxy resin (manufactured by Daicel, EHPE3150).
Component f: 20 parts by weight of an epoxy resin (manufactured by Nippon Steel Chemical Co., Ltd., YDCN700-10).
Component g: 1 part by weight of a photoacid generator (made by ADEKA, SP170).
Component h: 50 parts by weight of ethyl lactate (Wako Pure Chemical Industries, Ltd.)
A core forming material was prepared by mixing these components e to h.

[Formation material of under cladding layer]
Component i: 75 parts by weight of epoxy resin (Epogosei PT, manufactured by Yokkaichi Gosei Co., Ltd.)
Component j: 25 parts by weight of an epoxy resin (manufactured by Mitsubishi Chemical Corporation, JER1007).
Component k: 4 parts by weight of a photoacid generator (manufactured by San Apro, CPI 200K).
Component l: 50 parts by weight of ethyl lactate (manufactured by Wako Pure Chemical Industries).
By mixing these components i to l, a material for forming the underclad layer was prepared.

[Production of sheet-shaped optical waveguide]
An over clad layer was formed on the surface of the glass substrate by spin coating using the over clad layer forming material. The over cladding layer had a thickness of 5 μm, an elastic modulus of 1.2 GPa, and a refractive index of 1.503.

Next, a lattice-like core was formed on the surface of the over clad layer by photolithography using the core forming material. Each of the lattice-like intersections is a discontinuous intersection in which all four intersecting directions are separated by a gap and are discontinuous [see FIG. 3 (a)]. The width of the gap was 10 μm. The core had a thickness of 30 μm, the core width of the lattice portion was 100 μm, the pitch was 600 μm, the elastic modulus was 3 GPa, and the refractive index was 1.523.

Next, an under clad layer was formed on the surface of the over clad layer by spin coating using the under clad layer forming material so as to cover the core. The thickness of the under cladding layer (thickness from the surface of the over cladding layer) was 200 μm, the elastic modulus was 3 MPa, and the refractive index was 1.503.

And what stuck the double-sided tape (thickness 25 micrometers) on the single side | surface of the board | substrate (thickness 1mm) made from PET was prepared. Next, the other adhesive surface of the double-sided tape was attached to the surface of the under cladding layer, and in this state, the over cladding layer was peeled from the glass substrate.

[Comparative example]
[Formation material of over clad layer]
Component m: 40 parts by weight of an epoxy resin (Epogosei PT, manufactured by Yokkaichi Gosei Co., Ltd.).
Component n: 60 parts by weight of epoxy resin (Daicel, 2021P).
Component o: 4 weight part of photo-acid generators (made by ADEKA, SP170).
By mixing these components m to o, an over clad layer forming material was prepared.

[Core forming material]
Component p: 30 parts by weight of epoxy resin (Epogosei PT, manufactured by Yokkaichi Gosei Co., Ltd.)
Component q: 70 parts by weight of an epoxy resin (manufactured by DIC, EXA-4816).
Component r: 4 weight part of photo-acid generators (made by ADEKA, SP170).
The core forming material was prepared by mixing these components p to r.

[Formation material of under cladding layer]
Component s: 40 parts by weight of epoxy resin (Epogosei PT, manufactured by Yokkaichi Gosei Co., Ltd.)
Component t: 60 parts by weight of an epoxy resin (Daicel, 2021P).
Component u: 4 weight part of photo-acid generators (made by ADEKA, SP170).
By mixing these components s to u, a material for forming the under cladding layer was prepared.

[Production of sheet-shaped optical waveguide]
In the same manner as in the above example, a sheet-like optical waveguide having the same dimensions was produced. However, the elastic modulus was 1 GPa for the over clad layer, 25 MPa for the core, and 1 GPa for the under clad layer. The refractive index was 1.504 for the over clad layer, 1.532 for the core, and 1.504 for the under clad layer.

[Production of position sensor]
A light emitting element (Optowell, XH85-S0603-2s) is connected to one end face of the core of each of the sheet-like optical waveguides of the above examples and comparative examples, and a light receiving element (Hamamatsu Photonics, s10226) was connected, and a circuit equipped with the light emitting element, the light receiving element, and a CPU (manufactured by Microchip, dsPIC33FJ128MC706) for controlling these elements was provided, and each position sensor of Example and Comparative Example was manufactured.

[Production of information display device]
A tablet-type terminal (ICONIA TAB W500, manufactured by acer) was prepared, and the sheet-shaped optical waveguide of the position sensor was attached to the surface of the display. At this time, the under cladding layer was in contact with the surface of the display. In addition, the circuit on which the CPU and the like of the position sensor are mounted is arranged inside the tablet type terminal, and the power source necessary for the circuit is a power source provided in the tablet type terminal. In this way, the position sensor can be used. The display of the tablet-type terminal includes a sensor for detecting a change in the capacitance of the human body, but power supply to the sensor is stopped so that the sensor does not work.

[Operation check of information display device]
Then, the input person holds the ballpoint pen (the radius of curvature of the pen tip 350 μm) in his / her hand and inputs characters in the input area of the input device.

As a result, in the information display device using the sheet-like optical waveguide of the example, only the input characters were displayed on the display. On the other hand, in the information display device using the sheet-shaped optical waveguide of the comparative example, not only the input characters but also the hand portion having the ballpoint pen was displayed on the display.

In addition, the same result as described above was obtained even when the same input as described above was used instead of the above ballpoint pen by using a simple rod (tip radius of curvature 550 μm).

From these results, it can be seen that the position sensor of the embodiment can detect only the input information and not the unnecessary information even if the input body is changed.

Furthermore, the same tendency as in the above-described embodiment can be obtained even if each of the intersecting portions of the lattice-like core is a discontinuous intersection (see FIGS. 6A to 6D) in which the intersecting directions 1 to 3 are discontinuous. The result which shows was obtained. Furthermore, a discontinuous intersection in which 1 to 4 intersecting directions are discontinuous (see FIGS. 3A and 6A to 6D) and a continuous intersection in which all four intersecting directions are continuous [ As shown in FIG. 6 (e)], a result showing a tendency similar to that in the above-described example was obtained even in a lattice shape having two or more types of intersections.

In the above embodiments, specific forms in the present invention have been described. However, the above embodiments are merely examples and are not construed as limiting. Various modifications apparent to those skilled in the art are contemplated to be within the scope of this invention.

The information display device of the present invention can be used to display on a display what is input with a general writing instrument or the like on the display.

A position sensor D display P information display body W sheet-like optical waveguide 2 core 3 over clad layer 10 input body

Claims

A display for displaying information,
An information display device comprising the following position sensor (A),
The sheet-shaped optical waveguide of the position sensor is placed on the surface of the display, and the movement trajectory of the tip input portion of the input body on the surface of the sheet-shaped optical waveguide is displayed on the display as input information. Information display device.
(A) a sheet-like optical waveguide having a plurality of linear cores formed in a lattice shape, an under cladding layer that supports the cores, and an over cladding layer that covers the cores;
A light emitting element connected to one end face of the core;
A light receiving element connected to the other end surface of the core;
A position sensor comprising a movement locus specifying means for specifying the movement locus of the tip input portion of the input body on the surface of the sheet-shaped optical waveguide by the amount of light propagation of the core changed by the movement,
A part or all of the lattice-like intersection formed by the plurality of linear cores is formed as a discontinuous intersection in a state where at least one intersecting direction is divided by a gap,
The elastic modulus of the core is set to be larger than the elastic modulus of the under cladding layer and the elastic modulus of the over cladding layer, and the core in the pressing direction is pressed by the tip input portion on the surface of the sheet-like optical waveguide. A position sensor in which the deformation rate of the cross section of the under clad layer is smaller than the deformation rate of the cross sections of the over cladding layer and the under cladding layer.