WO2011081059A1 - センサー一体照光式キーシート - Google Patents
センサー一体照光式キーシート Download PDFInfo
- Publication number
- WO2011081059A1 WO2011081059A1 PCT/JP2010/072996 JP2010072996W WO2011081059A1 WO 2011081059 A1 WO2011081059 A1 WO 2011081059A1 JP 2010072996 W JP2010072996 W JP 2010072996W WO 2011081059 A1 WO2011081059 A1 WO 2011081059A1
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- WIPO (PCT)
- Prior art keywords
- sheet
- sensor
- light guide
- key
- integrated
- Prior art date
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Classifications
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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
- G06F3/02—Input arrangements using manually operated switches, e.g. using keyboards or dials
- G06F3/0202—Constructional details or processes of manufacture of the input device
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
- H03K17/9622—Capacitive touch switches using a plurality of detectors, e.g. keyboard
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/96—Touch switches
- H03K2217/9607—Capacitive touch switches
- H03K2217/960785—Capacitive touch switches with illumination
- H03K2217/96079—Capacitive touch switches with illumination using a single or more light guides
Definitions
- the present invention includes information devices such as mobile phones, personal handyphone systems (PHS), personal digital assistants (PDA) ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ , navigation systems, laptop computers, AV devices such as small audio players and portable music players,
- PDA personal digital assistants
- the present invention relates to a sensor-integrated illumination type key sheet incorporated in various electronic devices such as game machines and controllers used for operating game machines.
- push button switches that determine whether the switch is on or off by pressing the push buttons are used as input components.
- this push button switch one having a structure in which a key sheet having a push button (key top) is covered on a circuit board on which contact switches are arranged is used. Further, the push button switch having such a structure often has an illumination function for illuminating the key top of the key sheet by an internal light source arranged on the circuit board so that it can be easily operated in a dark place.
- Patent Document 1 Japanese Unexamined Patent Application Publication No. 2008-139961
- Patent Document 1 includes a sensor-integrated illumination type key sheet 111 including a key member 112, a light guide plate 113, a pressing sheet 114, and the like as shown in FIG.
- An integrated input device is described. This input device performs a pressing input operation using a metal dome as a contact switch, and performs a sliding input operation using coordinate input means 115.
- the coordinate input means 115 has a configuration in which a first electrode 115b and a second electrode 115c are formed with a base material 115a interposed therebetween. With respect to the illumination function, an air layer 116 is formed on the surface side of the light guide plate 113, and the light guide property of the light guide plate 113 is sufficiently secured to increase the brightness of the key member 112.
- the input device of patent document 1 can perform press input operation and slide input operation, and also has an illumination function
- each member is comprised separately, it is a structure where it is difficult to make the whole thickness thin.
- the convex part 113a of millimeter unit is provided on the surface of the light guide plate 113 on the key member 112 side and the air layer 116 is formed between the key member 112 and the light guide plate 113, the thickness of the entire input device is reduced. Is difficult.
- the space between the operation surface of the key member 112 and the coordinate input means 115 is widened by the air layer 116 having a thickness in millimeter units formed by the convex portions 113a in millimeter units, the sensitivity of the coordinate input means 115 tends to be dull. As a result, many malfunctions may occur.
- an object of the present invention is to provide a technique that can reduce the overall thickness of the push button switch while ensuring the brightness during illumination, and increase the sensitivity and accuracy of the slide input operation.
- a sensor-integrated illuminated key sheet comprising a light guide sheet for transmitting light, an operation unit provided in contact with the operation surface side of the light guide sheet, and a capacitance sensor used for slide input operation
- the capacitance sensor includes a sensor-integrated illumination type key sheet comprising a base material using a light guide sheet and an electrode formed on at least one of the operation surface side of the light guide sheet or the back surface side opposite to the operation surface side.
- the base material of the capacitance sensor is a light guide sheet.
- the base material of the capacitance sensor is a light guide sheet.
- the operation part is provided in the contact state in the operation surface side of the light guide sheet which is a base material of an electrostatic capacitance sensor. For this reason, the space
- the operation unit can be provided with a plurality of key tops formed in a block shape. If it does in this way, a press operation position can be clarified by visual observation and tactile sense, and it can make it easy to perform press input operation.
- the operation unit may include a frame sheet between the key tops.
- the gap between the key tops can be filled with the frame sheet, and even if the gap between the key tops is widened, the slide operation surface can be constituted by the top surface of the key top and the top surface of the frame sheet. . Therefore, the level difference of the slide operation surface can be reduced, and the distance from the slide operation surface to the capacitance sensor can be kept substantially constant. Therefore, the sensitivity of the capacitance sensor can be stabilized, and the accuracy of the slide input operation can be increased.
- the gap between the key tops can be widened by the frame sheet, it is possible to make it difficult for the adjacent key tops to be interlocked during the press input operation, and it is possible to prevent erroneous input of the press input operation.
- the gap between the key tops can be filled with a bar provided in the casing of the electronic device instead of arranging the frame sheet.
- the space between the key top and the frame of the housing becomes slightly wider than the space between the key top and the frame sheet due to heat shrinkage that occurs during the molding of the housing, and the appearance may deteriorate.
- the frame sheet can be omitted by arranging the key tops in a narrow space.
- the pressing load may increase in conjunction with the adjacent key tops during the pressing input operation.
- the key top and the frame sheet can be formed of a material having an equivalent dielectric constant.
- a capacitance sensor senses a change in capacitance between the electrode and a finger that is operated for slide input. For this reason, if the dielectric constants of the key top and the frame sheet are different, even if a key top and a frame sheet having substantially the same thickness are used, the finger is placed on the top surface of the key sheet and the top surface of the frame sheet. The electrostatic capacity between the electrode and the finger differs depending on the case where it is placed. Then, the capacitance sensor cannot sense accurate information, and there is a risk of malfunction due to the signal value output from the capacitance sensor.
- the key top and the frame sheet are formed of materials having the same dielectric constant as in the present invention, such a malfunction can be made difficult to occur, and the accuracy of the capacitance sensor can be improved.
- the key top and the frame sheet have the same dielectric constant, it is preferable that both are made of the same material. Moreover, if both are formed of the same material, highly accurate and stable production can be realized using the same processing method.
- the sensor-integrated illumination type key sheet having a key top in the operation unit can be provided on a cover sheet that is laminated on the operation surface side of the light guide sheet. That is, the operation unit includes a key top and a cover sheet. If it does in this way, the operation surface side of a capacitance sensor can be covered with a cover sheet, and the member which constitutes the operation surface side of a capacitance sensor can be made hard to be damaged. Therefore, the sensitivity of the capacitance sensor can be stabilized, and the accuracy of the slide input operation can be increased.
- the cover sheet provided with the key top is laminated in contact with the operation surface side of the light guide sheet, so the distance between the operation surface of the operation unit and the capacitance sensor can be reduced, and slide input The sensitivity and accuracy of operation can be increased. Therefore, it is possible to realize a sensor-integrated illuminated key sheet that can perform an accurate slide input operation.
- the surface of the cover sheet facing the light guide sheet can be a blast surface.
- the blast surface is a fine uneven surface on which unevenness of micron units is formed.
- the blast surface of a cover sheet is laminated
- the fine space of a micron unit can be formed in the operation surface side of a light guide sheet. Since the refractive index of the space is smaller than that of the light guide sheet, the light transmitted through the light guide sheet is easily reflected on the surface in contact with the space, and can hardly leak from the surface to the outside. Therefore, the light guide efficiency of the light guide sheet can be increased, and bright illumination can be realized.
- the operation portion can be a flat surface sheet formed with a certain thickness. In this way, the distance from the operation surface of the top sheet to the capacitance sensor can be kept constant, and the sensitivity of the capacitance sensor can be stabilized. Therefore, when the slide operation is performed on the operation surface, the accuracy of the capacitance sensor can be increased, and an accurate slide input operation can be performed.
- a transparent resin layer can be provided between the light guide sheet and the electrode.
- the electrode of the capacitance sensor is preferably formed on a flat surface. This is because if the electrode is formed on an uneven surface, it is easy to disconnect, and the capacitance may not be accurately detected.
- other layers are partially provided on the operation surface and back surface of the light guide sheet, or the operation surface and back surface itself of the light guide sheet are uneven. Even if it is formed in a shape, it can be leveled with a transparent resin layer, and the electrode can be formed on a flat surface. Therefore, it is possible to accurately sense the capacitance and perform a highly accurate slide input operation.
- the transparent resin layer can be formed of a resin having a lower refractive index than the light guide sheet. If it does in this way, the reflective efficiency of light can be raised at the interface of a light guide sheet and a transparent resin layer, and it can make it difficult to inject the light which propagates in a light guide sheet into a transparent resin layer. Therefore, it is possible to make it difficult for light to leak out of the light guide sheet, and to improve the light guide efficiency of the light guide sheet.
- the contact surface between the light guide sheet and the transparent resin layer can be a smooth surface. If it does in this way, it can be made hard to diffuse light at the interface of a light guide sheet and a transparent resin layer, and the light transmitted in a light guide sheet can be reflected in a light guide sheet efficiently. Therefore, the light in the light guide sheet can be made difficult to enter the transparent resin layer, and the light can be made difficult to leak out of the light guide sheet.
- a light shielding printing layer can be provided in the back surface side of a light guide sheet.
- This light-blocking print layer is a layer that absorbs or reflects light, and light hardly transmits through the light-blocking print layer.
- part of the light emitted from the internal light source is diffusely reflected between the sensor-integrated illuminated key sheet and the circuit board without entering the light guide sheet.
- this irregularly reflected light enters the light guide sheet from the back side of the sensor-integrated illuminated key sheet, it easily radiates from the operation surface side of the light guide sheet, and also illuminates a part of the operation unit that is not originally intended for illumination. End up.
- the base material of the capacitance sensor is a light guide sheet
- the electronic device incorporating this sensor-integrated illumination type key sheet can be reduced in size.
- the sensor-integrated illumination type key sheet has fewer components as described above, the manufacturing process can be simplified.
- the operation unit is provided in contact with the operation surface side of the light guide sheet, the distance between the operation surface of the operation unit and the capacitance sensor can be reduced, and the sensitivity and accuracy of the slide input operation can be reduced. Can be increased. Therefore, it is possible to realize a sensor-integrated illuminated key sheet that can perform an accurate slide input operation.
- FIG. 3 is a sectional view taken along line SA-SA in FIG. 1.
- Sectional drawing equivalent to FIG. 2 which shows the sensor-integrated illumination type key sheet of 2nd Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the sensor-integrated illumination type key sheet of 3rd Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification in the sensor integrated illumination key sheet of 3rd Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the sensor-integrated illumination type key sheet of 4th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification in the sensor-integrated illumination type key sheet of 4th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification in the sensor-integrated illumination type key sheet of 4th Embodiment.
- FIG. 2 which shows the sensor-integrated illumination type key sheet of 5th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification in the sensor-integrated illumination type key sheet of 5th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the sensor-integrated illumination type key sheet of 6th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification in the sensor integrated illumination key sheet of 6th Embodiment.
- FIG. 2 which shows the sensor-integrated illumination type key sheet of 7th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification 1 in the sensor integrated illumination key sheet of 7th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification 2 in the sensor-integrated illumination type key sheet of 7th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification 3 in the sensor-integrated illumination type key sheet of 7th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification 4 in the sensor-integrated illumination type key sheet of 7th Embodiment.
- Sectional drawing equivalent to FIG. 2 which shows the modification 5 in the sensor integrated illumination type key sheet of 7th Embodiment.
- a sensor-integrated illumination type key sheet used for an input part of a cellular phone is taken as an example.
- the same reference numerals are assigned to configurations common to the embodiments, and redundant description is omitted, and redundant descriptions of common materials, functions, effects, manufacturing methods, and the like are also omitted.
- FIGS. 1 and 2 A sensor-integrated illuminated key sheet 11 of the first embodiment is shown in FIGS. 1 is a plan view of the sensor-integrated illuminated key sheet 11, and FIG. 2 is a cross-sectional view of the sensor-integrated illuminated key sheet 11 taken along the line SA-SA.
- the sensor-integrated illumination type key sheet 11 of this embodiment includes a surface sheet 12 as an “operation unit”, a surface-type capacitance sensor 13, a light-shielding print layer 14, and a pusher sheet 15.
- the light guide sheet 13a is also a member that transmits light in the surface direction, and is formed of a transparent resin film.
- the surface on the operation surface side of the light guide sheet 13 a is a flat smooth surface 1.
- “flat” means that there is no undulation
- “smooth” means that there is no microscopic unevenness such as wrinkles or mats, and that the surface is smooth.
- Such a smooth surface 1 is preferably a mirror-finished surface or a transfer surface of a mirror-finished roll or mold. If the surface of the light guide sheet 13a is flat, the light guided in the light guide sheet 13a can be efficiently reflected, and light can be easily transmitted to a position away from the light incident position in the light guide sheet 13a. can do.
- the thickness of the light guide sheet 13a is preferably 30 ⁇ m to 500 ⁇ m. If the thickness is less than 30 ⁇ m, since the light guide sheet is thin, the amount of light transmitted through the light guide sheet is reduced, and the illumination brightness of the sensor-integrated illumination type key sheet is lowered. If the thickness exceeds 500 ⁇ m, the deformation stress increases, so the pressing load increases and the pressing operability deteriorates. A more preferable thickness is 100 ⁇ m to 300 ⁇ m.
- the material of the light guide sheet 13a is preferably a highly transparent thermoplastic resin film.
- polyolefin resin film vinyl resin film, acrylic resin film, polyamide resin film, polyester resin film, polycarbonate resin film, polyurethane resin film, polyether resin film and the like can be mentioned.
- a highly transparent polycarbonate resin film, acrylic resin film, and urethane resin film having no wavelength absorption region in the visible light region are preferable.
- the diffusion layer 13b is a layer that changes the light path to the operation surface side, and is formed on the back surface of the light guide sheet 13a corresponding to the pressing operation portion.
- the diffusion layer 13b is a resin coating film to which a filler is added, and the contact surface with the light guide sheet 13a is formed on the rough surface 2.
- the thickness of the diffusion layer 13b can be 5 ⁇ m to 30 ⁇ m. In addition, it can be set as the structure arrange
- the resin material used for the diffusion layer 13b is a resin that can be printed on the light guide sheet 13a.
- a high refractive index filler or a high light reflectance filler can be added.
- An example of such a filler is titanium oxide.
- This filler can adjust the luminance by adjusting the blending amount. For example, the diffusion layer 13b in the portion near the light incident position reduces the amount of filler, and the diffusion layer 13b in the portion far from the light incident position increases the amount so as to obtain uniform brightness as a whole. be able to. Further, the luminance may be adjusted by the thickness or pattern of the diffusion layer 13b.
- the diffusion layer 13b is printed and formed on the back surface of the light guide sheet 13a
- a solvent that is included in the ink to make the fixing surface of the light guide sheet 13a rough.
- the fixing surface of the polycarbonate resin film can be made rough.
- the surface can be roughened by rubbing with sandpaper or by pressing a mold formed on the rough surface 2 while applying heat. .
- Conductive metal oxides include indium tin oxide (ITO), zinc oxide, indium oxide, antimony-added tin oxide, fluorine-added tin oxide, aluminum-added zinc oxide, potassium-added zinc oxide, silicon-added zinc oxide, zinc oxide-oxidized
- ITO indium tin oxide
- Examples thereof include tin-based, indium oxide-tin oxide-based, zinc oxide-indium oxide-magnesium oxide-based, zinc oxide, and tin oxide film.
- the resin containing these conductive metal oxides include a polyester resin, a polyurethane resin, a polyamide resin, an epoxy resin, and an acrylic resin.
- the electrode 13c is formed of a material having a refractive index lower than that of the light guide sheet 13a or a material having a transmittance of 80% or more. Is preferred. In this way, it is possible to make it difficult for light transmitted through the light guide sheet 13a to leak at the interface with the electrode 13c.
- a transparent conductive polymer is suitable as a material having a high transmittance and capable of forming an electrode by printing on the light guide sheet 13a.
- the transparent resin layer 13d is a layer that increases the light guide efficiency of the light guide sheet 13a, and is formed in a size substantially equal to that of the light guide sheet 13a, covering the electrode 13c with respect to the back surface of the light guide sheet 13a.
- This transparent resin layer 13d is a transparent resin film formed by applying a non-erodible coating liquid to the light guide sheet 13a, and the contact surface with the light guide sheet 13a is formed on the flat smooth surface 1. Yes.
- the thickness of the transparent resin layer 13d can be set to 5 ⁇ m to 200 ⁇ m. If the thickness is less than 5 ⁇ m, the electrode 13c may not be reliably covered.
- the refractive index of the transparent resin layer 13d is preferably lower than the refractive index of the light guide sheet 13a. If the refractive index of the transparent resin layer 13d is lower than the refractive index of the light guide sheet 13a, the light transmitted in the surface direction in the light guide sheet 13a at the interface can be easily totally reflected. Furthermore, if the difference in refractive index between the two is 0.06 or more, total reflection can be performed efficiently.
- the light-shielding print layer 14 is formed on the back surface of the transparent resin layer 13d, if the light incident on the transparent resin layer 13d is reduced, the light incident on the light-shielding print layer 14 can also be reduced. The absorption of light by 14 can be reduced. Therefore, even if the light shielding printing layer 14 is added to the sensor-integrated illumination type key sheet 11, the decrease in illumination brightness can be reduced.
- the material of the transparent resin layer 13d is highly transparent and uses a non-erodible coating liquid that does not roughen the light guide sheet 13a.
- the light-shielding printing layer 14 is a layer that is difficult to transmit light in a dark color scheme such as black or dark blue, and is formed to have substantially the same size as the surface capacitive sensor 13 with respect to the back surface of the surface capacitive sensor 13. It is a resin coating film. That is, the transparent resin layer 13d is formed to have a size substantially equal to that of the transparent resin layer 13d with respect to the back surface of the transparent resin layer 13d.
- the thickness of the light-shielding print layer 14 can be 5 ⁇ m to 50 ⁇ m. If the thickness is less than 5 ⁇ m, the effect of blocking light may be reduced. If the thickness is larger than 50 ⁇ m, the light shielding effect does not change and the sensor-integrated illuminated key sheet 11 becomes thick.
- the pusher sheet 15 pushes toward the back side corresponding to the pressing operation portion so that the contact switch on the circuit board provided on the back side of the sensor-integrated illuminated key sheet 11 can be pressed. It is a member in which the part 15a is formed.
- the pusher portion 15 a is integrally connected by a base portion 15 b, and the base portion 15 b is fixed to the back surface of the light-shielding print layer 14.
- the material of the pusher sheet 15 is a resin or a rubber-like elastic body.
- the resin include polyurethane resin, polyethylene terephthalate resin, polyethylene naphthalate resin, polyacrylate resin, and polycarbonate resin.
- the rubber-like elastic body examples include thermosetting elastomers such as silicone rubber and urethane rubber, and thermoplastic elastomers such as styrene and polyester. If the pusher sheet is made light-shielding, the light-shielding printing layer can be omitted.
- the surface capacitive sensor 13 is manufactured.
- a resin film is prepared as the light guide sheet 13a, and the diffusion layer 13b is printed on one side (back surface) of the resin film.
- the electrode 13c is printed and formed so as to cover the diffusion layer 13b, and the transparent resin layer 13b is printed and formed so as to cover the electrode 13c and apply a non-erodible coating liquid that does not roughen the light guide sheet 13a. To do. In this way, the surface capacitive sensor 13 is obtained.
- the surface sheet 12 provided with a display layer (not shown) on the surface of the surface-type capacitance sensor 13 is provided on both sides of the figure. Secure with tape. Finally, a presser sheet 15 separately formed on the back surface of the light-shielding print layer 14 is fixed to obtain the sensor-integrated key sheet 11.
- the sensor-integrated illumination type key sheet 11 since the base material of the surface capacitive sensor 13 is the light guide sheet 13 a, it is not necessary to provide a light guide sheet separately from the surface capacitive sensor 13. The entire thickness of the sensor-integrated illuminated key sheet 11 can be reduced while ensuring the brightness at the time of illumination with the light guide sheet 13a. Therefore, an electronic device incorporating the sensor-integrated illumination type key sheet 11 can be reduced in size. Further, since the surface sheet 12 is provided in contact with the light guide sheet 13a that is the base material of the surface capacitance sensor 13, the operation surface of the surface sheet 12 and the surface capacitance sensor 13 are provided. , And the sensitivity and accuracy of the slide input operation can be increased. Therefore, the sensor-integrated illumination type key sheet 11 capable of performing an accurate slide input operation can be realized.
- the flat surface sheet 12 having a constant thickness is used as the operation portion, the distance from the operation surface of the surface sheet 12 to the surface capacitive sensor 13 can be kept constant, The sensitivity of the capacitance sensor 13 can be stabilized. Therefore, when the slide operation is performed on the operation surface, the accuracy of the surface-type capacitance sensor 13 can be increased, and an accurate slide input operation can be performed.
- a light shielding printing layer 14 is provided on the back surface of the transparent resin layer 13d. That is, since the light-shielding print layer 14 is provided on the back side of the light guide sheet 13a via the transparent resin layer 13d, the light that is irregularly reflected between the sensor-integrated illumination key sheet and the circuit board is sensor-integrated. It can be made difficult to enter the light guide sheet from the back side of the key sheet, and the appearance during illumination can be improved.
- FIG. 3 is a cross-sectional view of the sensor-integrated illuminated key sheet 21.
- the sensor-integrated illuminated key sheet 21 of the present embodiment is different from the sensor-integrated illuminated key sheet 11 of the first embodiment in the configuration of the surface capacitive sensor 23.
- Other configurations are the same as those of the sensor-integrated illuminated key sheet 11.
- the surface-type capacitance sensor 23 is a member that performs position detection during a slide input operation.
- the surface-type capacitance sensor 23 is a light guide sheet 23a, a diffusion layer 23b, an electrode 23c, and a transparent substrate.
- a resin layer 23d is provided.
- the difference from the surface capacitive sensor 13 is that a transparent resin layer 23d is provided between the light guide sheet 23a and the electrode 23c. That is, the transparent resin layer 23d is provided on the back surface of the light guide sheet 23a so as to cover the diffusion layer 23b, and the electrode 23c is not in contact with the light guide sheet 23a.
- a method for manufacturing the sensor-integrated illuminated key sheet 21 will be described.
- a diffusion layer 23b is printed on one surface (back surface) of a resin film as the light guide sheet 23a.
- a transparent resin layer 23b is printed and formed so as to cover the diffusion layer 23b, and an electrode 23c is printed and formed on the back surface of the transparent resin layer 23b.
- the surface capacitive sensor 23 is obtained.
- the surface sheet 12 is fixed to the surface of the surface capacitive sensor 23.
- the presser sheet 15 is fixed to the back surface of the light-shielding printing layer 14 to obtain the sensor integrated key sheet 21.
- the diffusion layer 23c is partially provided on the back surface of the light guide sheet 23a. Even if unevenness is formed on the back surface of the light guide sheet 23a, it can be leveled by the transparent resin layer 23d, and the electrode 23c can be formed on a flat surface. Therefore, it is possible to accurately sense the capacitance and perform a highly accurate slide input operation.
- the transparent resin layer 23d is formed of a resin having a refractive index lower than that of the light guide sheet 23a, the light reflection efficiency can be increased at the interface between the light guide sheet 23a and the transparent resin layer 23d, and the light is transmitted into the light guide sheet 23a. Light can be made difficult to enter the transparent resin layer 23d. Therefore, it is possible to make it difficult for light to leak out of the light guide sheet 23a, and to improve the light guide efficiency of the light guide sheet 23a.
- the contact surface between the light guide sheet 23a and the transparent resin layer 23d is the smooth surface 1, it is possible to make it difficult to diffuse light at the interface between the light guide sheet 23a and the transparent resin layer 23d.
- the transmitted light can be efficiently reflected into the light guide sheet 23a. Therefore, the light in the light guide sheet 23a can be made difficult to enter the transparent resin layer 23d, and the light can be made difficult to leak out of the light guide sheet 23a.
- FIG. 4 shows a sensor-integrated illumination type key sheet 31 according to the third embodiment.
- FIG. 4 is a sectional view of the sensor-integrated illumination type key sheet 31.
- the sensor-integrated illuminated key sheet 31 of the present embodiment is different from the sensor-integrated illuminated key sheet 21 of the second embodiment in that the sensor-integrated illuminated key sheet 21 includes a cover member 32 as an “operation unit” without including the topsheet 12. It is.
- Other configurations are the same as those of the sensor-integrated illuminated key sheet 21.
- the cover member 32 is a member that forms the operation surface side of the sensor-integrated illumination type key sheet 31, similarly to the surface sheet 12, and is fixed so as to cover the entire surface type capacitive sensor 23.
- the top sheet 12 is different from the top sheet 12 in a block-shaped key top portion 32a in which the pressing operation portion bulges toward the operation surface, and the key top portions 32a are integrally connected by the base portion 32b.
- Various materials can be used for the material of the cover member 32, but it is preferable to use an ultraviolet curable resin that allows easy formation of the cover member 32. If an ultraviolet curable resin is used, it can be fixed to the light guide sheet 23a simultaneously with the molding of the cover member 32.
- the thickness of the key top portion is preferably 0.2 mm to 0.6 mm.
- the thickness of the key top portion 32a As the thickness of the key top portion 32a is reduced, the distance from the operation surface on the top surface of the key top portion 32a to the surface-type capacitive sensor 23 can be reduced, and the sensitivity can be improved, but it is thinner than 0.2 mm. And cracks during the pressing operation. If the thickness of the key top portion 32a is constant, the distance from the operation surface of the key top portion 32a to the surface-type capacitance sensor 23 becomes constant, and it is possible to prevent erroneous recognition.
- a method for manufacturing the sensor-integrated illuminated key sheet 31 will be described.
- the surface-type capacitance sensor 23 is obtained.
- a display layer (not shown) is formed on the surface of the surface-type capacitance sensor 23, and the cover member 32 is formed and fixed.
- the presser sheet 15 is fixed to the back surface of the light-shielding print layer 14 to obtain the sensor-integrated key sheet 31.
- the cover member 32 since the cover member 32 includes the key top portion 32a formed in a block shape, the pressing operation position can be clarified by visual and tactile sense, and the pressing input operation can be easily performed. can do.
- the sensor-integrated illumination key sheet 31 includes the surface-type capacitive sensor 23.
- the sensor-integrated illumination-type key sheet 31a includes the surface-type capacitance sensor 13. it can. Even if it does in this way, it is not necessary to provide a light guide sheet separately from the surface-type capacitive sensor 13, and the entire sensor-integrated illumination type key sheet 31a is secured while ensuring the brightness at the time of illumination with the light guide sheet 13a. Can be made thinner.
- FIG. 6 is a sectional view of the sensor-integrated illumination type key sheet 41.
- the sensor integrated illumination key sheet 41 of the present embodiment is different from the sensor integrated illumination key sheet 31 of the third embodiment in the configuration of the cover sheet 42 as an “operation unit”. Other configurations are the same as those of the sensor-integrated illuminated key sheet 31.
- the cover member 42 is a member that forms the operation surface side of the sensor-integrated illumination type key sheet 41, and is mounted in a contact state so as not to be fixed so as to cover the entire surface type capacitive sensor 23. Is placed.
- the cover member 32 is different from the cover member 32 in that a block-shaped key top 42a as a pressing operation portion and a cover sheet 42b for integrally connecting the key tops 42a are formed separately and integrated by an adhesive layer 42c. Yes.
- the back surface of the cover sheet 42b is a blast surface, and the blast surface of the cover sheet 42b is in contact with the back surface of the cover sheet 42b and the surface of the light guide sheet 23a in the surface-type capacitance sensor 23.
- a fine space 42d in units of microns is formed.
- a highly transparent thermoplastic resin or reactive curable resin is used as the material of the key top 42a.
- examples thereof include polyolefin resins, vinyl resins, acrylic resins, polyamide resins, polyester resins, polycarbonate resins, polyurethane resins, polyether resins, epoxy resins, silicone resins, alkyd resins, and the like.
- acrylic resins, polycarbonate resins, polyurethane resins, epoxy resins, and silicone resins are preferably used from the viewpoint of processability and strength.
- the thickness of the key top portion is preferably 0.2 mm to 0.6 mm.
- a resin film such as a polyethylene terephthalate film, a polybutylene terephthalate film, a polyurethane film, a polyamide film, a polypropylene film, a polystyrene film, a fluorine film, an ionomer film, a polycarbonate film, or a polyvinyl chloride film may be used. it can. Furthermore, a colored layer and a light guide layer can be provided.
- the thickness of the cover sheet 42b is preferably 150 ⁇ m or less, and more preferably 50 ⁇ m or less, from the request for thinning.
- the key top 42a can be fixed to the cover sheet 42b, and various adhesives having translucency can be used. Further, it is preferable if it is transparent. For example, an ultraviolet curable resin, a hot melt resin, etc. are mentioned.
- a method for manufacturing the sensor-integrated illuminated key sheet 41 will be described.
- the surface capacitive sensor 23 is obtained.
- the presser sheet 15 is fixed to the back surface of the light-shielding print layer 14.
- the cover member 42 formed by fixing the key top 42a having a display layer (not shown) to the cover sheet 42b with the adhesive layer 42c is placed in contact with the surface of the surface-type capacitance sensor 23, The sensor integrated key sheet 41 is obtained.
- the cover member 42 since the cover member 42 includes the key top 42a and the cover sheet 42b, the operation surface side of the surface capacitive sensor 23 can be covered with the cover sheet 42b. It is possible to make it difficult to damage the operation surface side of the mold capacitance sensor 23. Therefore, the sensitivity of the surface capacitive sensor 23 can be stabilized, and the accuracy of the slide input operation can be increased. Further, the cover sheet 42b provided with the key top 42a is laminated in contact with the operation surface side of the light guide sheet 23a in the surface-type capacitance sensor 23, so that the operation surface which is the top surface of the key top 42a and The distance from the surface-type capacitive sensor 23 can be reduced, and the sensitivity and accuracy of the slide input operation can be increased. Therefore, the sensor-integrated illumination type key sheet 41 that can perform an accurate slide input operation can be realized.
- a fine space 42d in units of microns can be formed on the operation surface side of the light guide sheet 23a. Since the refractive index of the space 42d is smaller than that of the light guide sheet 23a, the light transmitted through the light guide sheet 23a is easily reflected on the surface in contact with the space 42d, and light can hardly be leaked from the surface to the outside. Therefore, the light guide efficiency of the light guide sheet 23a can be increased, and bright illumination can be realized.
- the sensor integrated illumination key sheet 41 of the fourth embodiment the surface type capacitive sensor 23 is provided.
- the sensor integrated illumination key sheet 41a of the modified example includes the surface type capacitive sensor 13. it can. Even if it does in this way, it is not necessary to provide a light guide sheet separately from the surface-type capacitive sensor 13, and the entire sensor-integrated illumination type key sheet 41a is secured while ensuring the brightness at the time of illumination with the light guide sheet 13a. Can be made thinner.
- FIG. 8 shows a sensor-integrated illumination type key sheet 51 according to the fifth embodiment.
- FIG. 8 is a sectional view of the sensor-integrated illumination type key sheet 51.
- the sensor-integrated illuminated key sheet 51 of the present embodiment is different from the sensor-integrated illuminated key sheet 31 of the third embodiment in that a key top 52a and a frame sheet 52e as an “operation unit” are provided without the cover member 32. It is a point to prepare.
- Other configurations are the same as those of the sensor-integrated illuminated key sheet 31.
- the key top 52a is formed in a block shape as a pressing operation portion, and is fixed to the operation surface side of the surface capacitive sensor 23 by an adhesive layer 52c.
- the frame sheet 52e is formed so as to fill the space between the key tops 52a and further surround the outer periphery of the group of key tops 52a, and is fixed to the operation surface side of the surface-type capacitive sensor 23 by an adhesive layer 52c.
- a resin film capable of forming a printing layer or a vapor deposition layer is used as the material of the frame sheet 52e.
- the thickness of the frame sheet 52e is preferably about 0.2 mm to 0.5 mm, which is slightly thinner than the thickness of the key top 52a.
- the frame sheet 52e and the key top 52a are preferably formed of a material having an equivalent dielectric constant. If both are formed of the same material, the dielectric constant can be made the same.
- a method for manufacturing the sensor-integrated illuminated key sheet 51 will be described.
- the surface capacitive sensor 23 is obtained.
- the presser sheet 15 is fixed to the back surface of the light-shielding print layer 14.
- a key top 52a having a display layer (not shown) and a frame sheet 52e are fixed to the surface of the surface capacitive sensor 23 with an adhesive layer 52c, whereby the sensor integrated key sheet 51 is obtained.
- the operation unit since the operation unit includes the key top 52a and the frame sheet 52e, the gap between the key tops 52a can be filled with the frame sheet 52e, and the gap between the key tops 52a is widened.
- the top surface of the key top 52a and the top surface of the frame sheet 52e can form a slide operation surface. Therefore, the level difference of the slide operation surface can be reduced, and the distance from the slide operation surface to the surface-type capacitance sensor 23 can be kept substantially constant. Therefore, the sensitivity of the surface capacitive sensor 23 can be stabilized, and the accuracy of the slide input operation can be increased.
- the gap between the key tops 52a is widened by the frame sheet 52e, it is possible to make it difficult for the adjacent key tops 52a to be interlocked during the press input operation, and to prevent erroneous input of the press input operation. .
- the key top 52a and the frame sheet 52e are formed of materials having the same dielectric constant, the accuracy of the surface-type capacitance sensor 23 can be increased, and malfunction can be prevented.
- the sensor-integrated illumination type key sheet 51 includes the surface-type capacitive sensor 23.
- the sensor-integrated illumination-type key sheet 51a includes the surface-type capacitance sensor 13. it can. Even if it does in this way, it is not necessary to provide a light guide sheet separately from the surface capacitive sensor 13, and the entire sensor-integrated illumination type key sheet 51a is secured while ensuring the brightness at the time of illumination with the light guide sheet 13a. Can be made thinner.
- FIG. 10 shows a sensor-integrated illumination type key sheet 61 according to the sixth embodiment.
- FIG. 10 is a cross-sectional view of the sensor-integrated illumination type key sheet 61.
- the sensor-integrated illuminated key sheet 61 of the present embodiment is different from the sensor-integrated illuminated key sheet 51 of the fifth embodiment in that a cover sheet 62 as an “operation unit” is provided without the key top 52a and the frame sheet 52e. It is a point to prepare.
- Other configurations are the same as those of the sensor-integrated illuminated key sheet 51.
- the cover member 62 is a member that forms the operation surface side of the sensor-integrated illuminated key sheet 61, and is placed in a contact state so as not to be fixed so as to cover the entire surface type capacitance sensor 23.
- the cover member 62 is formed by fixing a key top 62a and a frame sheet 62e to the cover sheet 62b with an adhesive layer 62c.
- the key top 62a is formed in a block shape as a pressing operation portion, and the frame sheet 62e is formed so as to fill the space between the key tops 62a and further surround the outer periphery of the group of key tops 62a.
- the back surface of the cover sheet 62b is a blast surface, and a micron by the blast surface of the cover sheet 62b is in contact with the back surface of the cover sheet 62b and the surface of the light guide sheet 23a in the surface-type capacitance sensor 23.
- a fine unit space 62d is formed.
- the surface-type electrostatic capacitance sensor 23 is obtained in the same manner as the sensor-integrated illumination type key sheet 51.
- the presser sheet 15 is fixed to the back surface of the light-shielding print layer 14.
- a cover member 62 formed by fixing a key top 62a having a display layer (not shown) and a frame sheet 62e to the cover sheet 62b with an adhesive layer 62c is brought into contact with the surface of the surface-type capacitive sensor 23.
- the sensor integrated key sheet 61 is obtained by placing it.
- the cover sheet 62b since the cover sheet 62b is provided, the operation surface side of the surface capacitive sensor 23 can be covered with the cover sheet 62b, and the light guide sheet in the surface capacitive sensor 23 can be covered. 23a can be made difficult to be damaged. Therefore, the sensitivity of the surface capacitive sensor 23 can be stabilized, and the accuracy of the slide input operation can be increased.
- the cover sheet 62b provided with the key top 62a and the frame sheet 62e is laminated in contact with the operation surface side of the light guide sheet 23a in the surface-type capacitance sensor 23, and therefore the key top 62a and the frame sheet 62e.
- the distance between the operation surface, which is the top surface, and the surface-type capacitance sensor 23 can be reduced, and the sensitivity and accuracy of the slide input operation can be increased. Therefore, the sensor-integrated illumination type key sheet 61 that can perform an accurate slide input operation can be realized.
- a fine space 62d in units of microns can be formed on the operation surface side of the light guide sheet 23a. Since the refractive index of the space 62d is smaller than that of the light guide sheet 23a, light transmitted through the light guide sheet 23a is easily reflected on the surface in contact with the space 62d, and light can hardly be leaked from the surface to the outside. Therefore, the light guide efficiency of the light guide sheet 23a can be increased, and bright illumination can be realized.
- the sensor-integrated illumination type key sheet 61 includes the surface-type capacitive sensor 23.
- the sensor-integrated illumination-type key sheet 61a according to the modification includes the surface-type capacitance sensor 13. it can. Even if it does in this way, it is not necessary to provide a light guide sheet separately from the surface-type capacitive sensor 13, and the entire sensor-integrated illumination type key sheet 61a is secured while ensuring the brightness at the time of illumination with the light guide sheet 13a. Can be made thinner.
- FIG. 12 shows a sensor-integrated illumination type key sheet 71 according to the seventh embodiment.
- FIG. 12 is a cross-sectional view of the sensor-integrated illumination type key sheet 71.
- the sensor-integrated illumination type key sheet 71 of the present embodiment is different from the sensor-integrated illumination type key sheet 21 of the second embodiment in that a projection-type capacitance sensor 73 is provided instead of the surface-type capacitance sensor 23. It is.
- Other configurations are the same as those of the sensor-integrated illuminated key sheet 21.
- the projected capacitive sensor 73 is a member that detects a position during a slide input operation, and includes a light guide sheet 73a, a diffusion layer 73b, a first electrode 73c, a second electrode 73d, and a transparent resin layer 73e serving as a base material. I have. If the projection capacitive sensor 73 is used as in the present embodiment, multipoint detection can be performed and the slide input operation can be diversified. However, when detecting a position in only one direction of the X coordinate or the Y coordinate, one of the electrodes may be formed.
- the light guide sheet 73a is also a member that transmits light in the surface direction, and is formed of a transparent resin film.
- the surface on the operation surface side of the light guide sheet 73a is a flat smooth surface 1.
- the diffusion layer 73b is a layer that changes the light path to the operation surface side, and is formed on the back surface of the light guide sheet 73a corresponding to the pressing operation portion.
- the first electrode 73c is a member that detects one of the X coordinate and the Y coordinate, and is formed on the back surface of the light guide sheet 73a via a transparent resin layer 73e. That is, the first electrode 73c is not in contact with the light guide sheet 73a.
- the first electrode 73c is composed of a plurality of conductive films extending in parallel.
- the second electrode 73d is a member that detects the other of the X coordinate and the Y coordinate, and is formed on the surface of the light guide sheet 73a via the transparent resin layer 73e. That is, the second electrode 73d is not in contact with the light guide sheet 73a.
- the second electrode 73d is also composed of a plurality of conductive films extending in parallel, and the extending direction intersects the extending direction of the first electrode 73c perpendicularly. Similar to the transparent resin layer 23d, the transparent resin layer 73e is a layer that improves the light guide efficiency of the light guide sheet 73a.
- the back surface of the light guide sheet 73a covers the diffusion layer 73b and the light guide sheet 73a. It is formed in substantially the same size.
- the surface of the light guide sheet 73a is also formed to have substantially the same size as the light guide sheet 73a.
- the transparent resin layer 73e is a transparent resin coating formed by applying a non-erodible coating liquid to the light guide sheet 73a, and the contact surface with the light guide sheet 73a is formed on the flat smooth surface 1. Yes.
- a method for manufacturing the sensor-integrated illuminated key sheet 71 will be described.
- a diffusion layer 73b is formed by printing on one surface (back surface) of a resin film as the light guide sheet 73a. Then, the transparent resin layer 73e is printed and formed so as to cover the diffusion layer 73b, and the first electrode 73c is printed and formed on the back surface of the transparent resin layer 73e. Further, the transparent resin layer 73e is printed and formed so as to cover the surface of the resin film, and the second electrode 73d is printed and formed on the surface of the transparent resin layer 73e. In this way, the projection capacitive sensor 73 is obtained.
- the top sheet 12 is fixed to the surface of the projection capacitive sensor 73.
- the presser sheet 15 is fixed to the back surface of the light-shielding printing layer 14 to obtain a sensor-integrated key sheet 71.
- the sensor-integrated illumination type key sheet 71 it is not necessary to provide a light guide sheet separately from the projection capacitive sensor 73, and the sensor integrated illumination is performed while ensuring the brightness at the time of illumination with the light guide sheet 73a.
- the thickness of the entire formula key sheet 71 can be reduced. Therefore, the electronic device incorporating the sensor-integrated illumination type key sheet 71 can be reduced in size. Further, since the sensor-integrated illumination type key sheet 71 has fewer components, the manufacturing process can be simplified. Further, since the surface sheet 12 is provided in contact with the operation surface side of the light guide sheet 73a, the distance between the operation surface of the surface sheet 12 and the projection capacitive sensor 73 can be reduced, and slide input is performed. The sensitivity and accuracy of operation can be increased. Therefore, the sensor-integrated illumination type key sheet 71 that can perform an accurate slide input operation can be realized.
- a diffusion layer 73c is partially provided on the back surface of the light guide sheet 73a, and the back surface of the light guide sheet 73a is uneven. Can be leveled by the transparent resin layer 73e, and the first electrode 73c can be formed on a flat surface. Therefore, it is possible to accurately sense the capacitance and perform a highly accurate slide input operation.
- the transparent resin layer 73e is formed of a resin having a refractive index lower than that of the light guide sheet 73a, the light reflection efficiency can be increased at the interface between the light guide sheet 73a and the transparent resin layer 73e, and the light is transmitted into the light guide sheet 73a.
- Light can be made difficult to enter the transparent resin layer 73e. Therefore, it is possible to make it difficult to leak light to the outside of the light guide sheet 73a, and to improve the light guide efficiency of the light guide sheet 73a.
- the contact surface between the light guide sheet 73a and the transparent resin layer 73e is the smooth surface 1, light can be hardly diffused at the interface between the light guide sheet 73a and the transparent resin layer 73e.
- the transmitted light can be efficiently reflected into the light guide sheet 73a. Therefore, the light in the light guide sheet 73a can be made difficult to enter the transparent resin layer 73e, and the light can be made difficult to leak out of the light guide sheet 73a.
- the sensor-integrated illumination key sheet 71 includes the projection capacitive sensor 73.
- the sensor-integrated illumination key sheet 71a of Modification 1 includes the projection capacitive sensor 76.
- the first electrode 76c is formed so as to cover the diffusion layer 76b on the back surface of the light guide sheet 76a serving as a base material, and further, the back surface of the light guide sheet 76a.
- a transparent resin layer 76e having a size substantially equal to that of the light guide sheet 76a is formed so as to cover the first electrode 76c.
- a second electrode 76d is formed on the surface of the light guide sheet 76a, and the second electrode 76d is covered with respect to the surface of the light guide sheet 76a, and a transparent resin layer having substantially the same size as the light guide sheet 76a. 76e is formed. That is, the first electrode 76c and the second electrode 76d are in contact with the light guide sheet 76a. Even if it does in this way, it is not necessary to provide a light guide sheet separately from the projection capacitive sensor 76, and the entire sensor-integrated illumination type key sheet 71a is secured while ensuring the brightness at the time of illumination with the light guide sheet 76a. Can be made thinner.
- Modification 2 of the seventh embodiment (FIG. 14) :
- the sensor-integrated illumination type key sheet 71 of the seventh embodiment includes the top sheet 12
- the sensor-integrated illumination key sheet 71b of Modification 2 can include the cover member 32. Even in this case, since the cover member 32 includes the key top portion 32a formed in a block shape, the pressing operation position can be clarified by visual and tactile sense, and the pressing input operation can be easily performed. Further, the sensor-integrated illumination type key sheet 71 b can also include a projected capacitive sensor 76 instead of the projected capacitive sensor 73.
- Modification 3 of the seventh embodiment (FIG. 15) : Although the sensor-integrated illumination type key sheet 71 of the seventh embodiment includes the top sheet 12, the sensor-integrated illumination key sheet 71 c of the third modification can include the cover sheet 42. Even in this case, the operation surface side of the projection capacitive sensor 73 can be covered with the cover sheet 42b, and the operation surface side of the projection capacitance sensor 73 can be hardly damaged. Further, the distance between the operation surface, which is the top surface of the key top 42a, and the projected capacitive sensor 73 can be reduced, and the sensitivity and accuracy of the slide input operation can be increased.
- a micron-sized fine space 42d can be formed on the operation surface side of the light guide sheet 23a, and the light transmitted through the light guide sheet 23a is easily reflected on the surface in contact with the space 42d, and light is transmitted from the surface to the outside. Can be made difficult to leak.
- the sensor-integrated illumination type key sheet 71 c can also include a projected capacitive sensor 76 instead of the projected capacitive sensor 73.
- the sensor-integrated illumination key sheet 71 includes the top sheet 12.
- the sensor-integrated illumination key sheet 71d according to the fourth modification can include the key top 52a and the frame sheet 52e. Even in this case, since the slide operation surface is configured by the top surface of the key top 52a and the top surface of the frame sheet 52e, the step of the slide operation surface can be reduced. The interval up to 73 can be kept substantially constant. Furthermore, if the key top 52a and the frame sheet 52e are formed of materials having the same dielectric constant, the accuracy of the projected capacitive sensor 73 can be increased, and malfunctions can be prevented.
- the sensor-integrated illumination type key sheet 71 d can also include a projected capacitive sensor 76 instead of the projected capacitive sensor 73.
- Modification 5 of the seventh embodiment (FIG. 17) :
- the sensor-integrated illumination type key sheet 71 of the seventh embodiment includes the top sheet 12
- the sensor-integrated illumination key sheet 71 e of Modification 5 can include the cover sheet 62. Even in this case, the operation surface side of the projected capacitive sensor 73 can be covered with the cover sheet 62b, and the transparent resin layer 73e in the projected capacitive sensor 73 can be made difficult to be damaged.
- the distance between the operation surface, which is the top surface of the key top 62a or the frame sheet 62e, and the projection capacitive sensor 73 can be reduced, and the sensitivity and accuracy of the slide input operation can be increased.
- the sensor-integrated illumination type key sheet 71 e can also include a projected capacitive sensor 76 instead of the projected capacitive sensor 73.
- Common modification 1 can omit the light-shielding print layer 14. In this way, since light absorption by the light-shielding print layer 14 is eliminated, the transparent resin layer provided on the back side of each light guide sheet can be omitted, and the sensor-integrated illuminated key sheet can be made thin. .
- the common modification 2 can be provided with a pusher body made of hard resin instead of the pusher sheet 15.
- a pusher body made of hard resin instead of the pusher sheet 15.
- an ultraviolet curable resin that can be easily formed as the pusher body. By doing so, there is no shock absorption by the pusher body, and the click feeling of the contact switch can be accurately transmitted.
- the back side of the sensor-integrated illuminated key sheet can be flattened by eliminating the pusher body. In this way, the sensor-integrated illuminated key sheet can be thinned.
- the common modification example 3 can omit the operation unit and directly provide a display layer on each capacitance sensor. In this way, the sensitivity and accuracy of the slide input operation can be increased, and the sensor-integrated illuminated key sheet can be made thinner.
- the common modification 4 can also provide the diffusion layer 13b on the front surface of the light guide sheet 13a or the front and back surfaces of the light guide sheet 13a. Even in this case, the light path can be changed to the operation surface side.
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Abstract
Description
すなわち、光を伝える導光シートと、導光シートの操作面側に接触状態で設ける操作部と、スライド入力操作に用いる静電容量センサーと、を備えるセンサー一体照光式キーシートであって、静電容量センサーは、導光シートによる基材と、その導光シートの操作面側または操作面側とは反対の裏面側の少なくとも一方に形成される電極と、でなるセンサー一体照光式キーシートを提供する。
また、前述したように、スライド操作面を有する操作部と静電容量センサーとの間がミリ単位厚さの空気層によって離れていると、操作面と座標入力手段との間隔が広がり、静電容量センサーの感度を鈍くして誤動作を生じることがある。しかし本発明では、静電容量センサーの基材である導光シートの操作面側に操作部が接触状態で設けられている。このため操作部の操作面と静電容量センサーとの間隔を小さくすることができ、スライド入力操作の感度及び精度を高めることができる。よって正確なスライド入力操作を行えるセンサー一体照光式キーシートを実現することができる。
なお、操作部にキートップを備える場合、フレームシートを配置する替わりに電子機器の筐体に設けた桟でキートップどうしの隙間を埋めることができる。しかしこの構成では、筐体の成形時に起こる熱収縮によってキートップと筐体の桟との間隔が、キートップとフレームシートとの間隔よりやや広がり易くなるため、見映えが悪くなることがある。また、キートップどうしを狭間に配置してフレームシートを省くことができる。しかしこの構成では、押圧入力操作の際に隣接するキートップも連動して押圧荷重が大きくなることがある。
特に、導光シートの裏面側に透明樹脂層を設けるセンサー一体照光式キーシートについては、その透明樹脂層の裏面に光を吸収する性質の遮光印刷層を設けることができる。このようにすれば、導光シートと遮光印刷層との間に介在する透明樹脂層が導光シート内の光を透明樹脂層へ入射し難くしているため、導光シート内の光を遮光印刷層で吸収し難くすることができ、遮光印刷層を備えていても導光シートの導光効率を高めることができる。
また、導光シートの操作面側に操作部が接触状態で設けられているため、操作部の操作面と静電容量センサーとの間隔を小さくすることができ、スライド入力操作の感度及び精度を高めることができる。よって正確なスライド入力操作を行えるセンサー一体照光式キーシートを実現することができる。
第1実施形態のセンサー一体照光式キーシート11を図1、図2に示す。図1はセンサー一体照光式キーシート11の平面図であり、図2はセンサー一体照光式キーシート11のSA-SA線断面図である。本実施形態のセンサー一体照光式キーシート11は、「操作部」としての表面シート12、表面型静電容量センサー13、遮光印刷層14、押し子シート15を備えている。
表面シート12の材質は、透明な樹脂フィルムを使用する。特に透明性の高い熱可塑性樹脂フィルムが好ましい。例えば、ポリカーボネート樹脂フィルム、ポリメチルメタクリレート樹脂フィルム、アクリル樹脂フィルム、ウレタン樹脂フィルム、ポリエチレンテレフタレート樹脂フィルムなどが挙げられる。なかでも可視光領域に波長の吸収領域がなく高透明性のポリカーボネート樹脂フィルム、ポリメチルメタクリレート樹脂フィルム、アクリル樹脂フィルム、ウレタン樹脂フィルムなどが好ましい。
なお、本実施形態では、後述する表面型静電容量センサー13の導光シート13aに対して、表面シート12を図外の両面テープで固着している。そして導光シート13aの屈折率を両面テープにおける粘着層の屈折率より0.06以上大きくすれば粘着層と導光シート13aとの界面で光の反射効率を高めることができ、導光シート13a内に伝わる光を粘着層へ入射し難くすることができる。
ところで、静電容量センサーの検出方式には、表面型と投影型の2種類がある。表面型の構成では基材の片面に電極が形成され、投影型の構成では基材の両面に電極が形成されている。そこで表面型にすれば、導光シート13aの裏面側に電極13cを形成することで、導光シート13aの操作面側では電極を不要にすることができ、照光時に電極を視認し難くすることができる。
導光シート13aの材質は、透明性の高い熱可塑性樹脂フィルムを使用することが好ましい。例えば、ポリオレフィン系樹脂フィルム、ビニル系樹脂フィルム、アクリル系樹脂フィルム、ポリアミド系樹脂フィルム、ポリエステル系樹脂フィルム、ポリカーボネート樹脂フィルム、ポリウレタン系樹脂フィルム、ポリエーテル系樹脂フィルムなどが挙げられる。なかでも可視光領域に波長の吸収領域がなく高透明性のポリカーボネート樹脂フィルム、アクリル系樹脂フィルム、ウレタン系樹脂フィルムが好ましい。
拡散層13bに用いる樹脂の材質は、導光シート13aに印刷形成が可能な樹脂を使用する。例えば、ポリオレフィン系樹脂、ビニル系樹脂、アクリル系樹脂、ポリアミド系樹脂、ポリエステル系樹脂、ポリカーボネート樹脂、ポリウレタン系樹脂、ポリエーテル系樹脂などが挙げられる。
さらに、高屈折率の充填材や光反射率の高い充填材を添加することができる。このような充填材には、例えば、酸化チタンが挙げられる。この充填材は、配合量を調整して輝度を調整することができる。例えば、光の入射位置に近い部分の拡散層13bは充填材の配合量を少なくして、光の入射位置から遠い部分の拡散層13bでは配合量を増やすことで、全体として均一な輝度にすることができる。また、拡散層13bの厚みやパターンで輝度を調整しても良い。
拡散層13bを導光シート13aの裏面に印刷形成する際には、そのインキに含まれる溶剤で導光シート13aの固着面を粗面2にするものを用いることが好ましい。例えば、ポリカーボネート樹脂フィルムでなる導光シート13aに対しては、芳香族系、ケトン系、エステル系などの溶剤を含むインキを用いれば、ポリカーボネート樹脂フィルムの固着面を粗面2とすることができる。また、インキを塗布して拡散層13bを形成するのではなく、サンドペーペーで擦ったり、粗面2に形成された金型を熱を加えながら押し付けたりして、粗面2化することでもできる。
電極13cの材質は、導電性高分子、導電性金属、導電性金属酸化物を含有する樹脂を使用できる。例えば、透明導電性高分子としては、ポリチオフェン系、ポリアセチレン系などが挙げられる。導電性金属としては、金、銀、白金、ニッケルなどが挙げられる。導電性金属酸化物としては、酸化インジウム錫(ITO)、酸化亜鉛、酸化インジウム、アンチモン添加酸化錫、フッ素添加酸化錫、アルミニウム添加酸化亜鉛、カリウム添加酸化亜鉛、シリコン添加酸化亜鉛、酸化亜鉛-酸化錫系、酸化インジウム-酸化錫系、酸化亜鉛-酸化インジウム-酸化マグネシウム系、酸化亜鉛、スズ酸化膜などが挙げられる。またこれら導電性金属酸化物を含有する樹脂としては、ポリエステル樹脂、ポリウレタン樹脂、ポリアミド樹脂、エポキシ樹脂、アクリル樹脂などが挙げられる。
なお、本実施形態のように導光シート13aと電極13cとが接触する場合には、導光シート13aより屈折率の低い材料または80%以上の透過率を有する材料で電極13cを形成することが好ましい。このようにすれば、導光シート13a内を伝わる光を電極13cとの界面で漏れ難くすることができる。そして透過率が高く導光シート13aに対して印刷で電極を形成できる材料としては、透明導電性高分子が好適である。また、本実施形態ように導光シート13aの裏面側に電極13cを設ける場合は、透光性が求められないため、銀やカーボンなど透明ではない導電材料を用いた導電インクを用いることができる。また、電極13cの酸化を防ぐため、電極13cを覆うようにレジストインクを塗布しても良い。
このような透明樹脂層13dの厚さは5μm~200μmとすることができる。厚さが5μmより薄いと、電極13cを確実に覆うことができないおそれがある。厚さが200μmより厚いと、変形応力が大きくて押圧荷重が高くなったり、センサー一体照光式キーシート11が厚くなってしまう。さらに好ましい厚みは5μm~30μmである。
透明樹脂層13dの屈折率は、導光シート13aの屈折率より低いことが好ましい。透明樹脂層13dの屈折率が導光シート13aの屈折率よりも低ければ、その界面で導光シート13a内の面方向へ伝わる光を全反射し易くすることができる。さらに両者の屈折率差が0.06以上であれば、効率よく全反射することができる。このように導光シート13a内の面方向へ伝わる光を全反射し易くすれば、導光効率を高めて、さらに光漏れし難くすることができる。透明樹脂層13dの裏面には遮光印刷層14を形成しているため、透明樹脂層13dへ入射する光を少なくすれば、遮光印刷層14に入射する光も少なくすることができ、遮光印刷層14による光の吸収を小さくすることができる。よってセンサー一体照光式キーシート11に遮光印刷層14を付加しても照光輝度の低下を少なくすることができる。
透明樹脂層13dの材質は、透明性が高く、導光シート13aを粗面化しない非浸食性塗液を使用する。具体的には、無溶剤の紫外線硬化型、EB硬化型などの活性エネルギー線硬化型樹脂、水系やアルコール系などの溶剤を含有する2液硬化型樹脂、熱硬化型樹脂などを用いる。こうした塗液には、例えば、紫外線硬化型ウレタンアクリレート系インキ、熱硬化型のウレタン系インキなどが挙げられる。透明樹脂層13dを架橋又は硬化型のインキで形成することで、透明樹脂層13dに積層する遮光印刷層14やその他の印刷層によって浸食され難い層とすることができる。
このような遮光印刷層14の厚さは5μm~50μmとすることができる。厚さが5μmより薄いと、光を遮断する効果が低下するおそれがある。厚さが50μmより厚いと、遮光効果は変わらずにセンサー一体照光式キーシート11が厚くなってしまう。
なお、遮光印刷層14は、塗装による遮光塗装層、蒸着による遮光蒸着層など、他の方法で形成した遮光性の層と置き換えることができる。
押し子シート15の材質は、樹脂やゴム状弾性体を使用する。例えば、樹脂としては、ポリウレタン樹脂、ポリエチレンテレフタレート樹脂、ポリエチレンナフタレート樹脂、ポリアクリレート樹脂、ポリカーボネート樹脂などが挙げられる。ゴム状弾性体としては、シリコーンゴムやウレタンゴムなどの熱硬化性エラストマー、スチレン系やポリエステル系などの熱可塑性エラストマーが挙げられる。
なお、押し子シートを遮光性にすれば、遮光印刷層を省くことができる。
先ず、表面型静電容量センサー13を製造する。導光シート13aとして樹脂フィルムを準備し、この樹脂フィルムの片面(裏面)に拡散層13bを印刷形成する。そしてこの拡散層13bを覆うようにして電極13cを印刷形成し、この電極13cを覆うようにして導光シート13aを粗面化しない非浸食性塗液を塗布して透明樹脂層13bを印刷形成する。こうして、表面型静電容量センサー13を得る。
次に、表面型静電容量センサー13の裏面に遮光印刷層14を印刷形成した後、表面型静電容量センサー13の表面に、図外の表示層を設けた表面シート12を図外の両面テープで固着する。
最後に、遮光印刷層14の裏面に別途形成した押し子シート15を固着して、センサー一体型キーシート11を得る。
センサー一体照光式キーシート11によれば、表面型静電容量センサー13の基材が導光シート13aであるため、表面型静電容量センサー13とは別体に導光シートを備える必要が無く、照光時の明るさを導光シート13aで確保しながら、センサー一体照光式キーシート11全体の厚さを薄くすることができる。よってこのセンサー一体照光式キーシート11を組み込んだ電子機器を小型化することができる。
また、表面型静電容量センサー13の基材である導光シート13aの操作面側に表面シート12が接触状態で設けられているため、表面シート12の操作面と表面型静電容量センサー13との間隔を小さくすることができ、スライド入力操作の感度及び精度を高めることができる。よって正確なスライド入力操作を行えるセンサー一体照光式キーシート11を実現することができる。
第2実施形態のセンサー一体照光式キーシート21を図3に示す。図3はセンサー一体照光式キーシート21の断面図である。本実施形態のセンサー一体照光式キーシート21が第1実施形態のセンサー一体照光式キーシート11と異なるのは、表面型静電容量センサー23の構成である。その他の構成は、センサー一体照光式キーシート11と同じである。
第3実施形態のセンサー一体照光式キーシート31を図4に示す。図4はセンサー一体照光式キーシート31の断面図である。本実施形態のセンサー一体照光式キーシート31が第2実施形態のセンサー一体照光式キーシート21と異なるのは、表面シート12を備えずに「操作部」としてのカバー部材32を備えている点である。その他の構成は、センサー一体照光式キーシート21と同じである。
カバー部材32の材質には、種々の樹脂を用いることができるが、カバー部材32の形成が容易な紫外線硬化型樹脂を用いることが好ましい。紫外線硬化型樹脂を用いれば、カバー部材32の成形と同時に導光シート23aに固着することができる。キートップ部の厚さは0.2mm~0.6mmとすることが好ましい。キートップ部32aの厚さは薄いほど、キートップ部32aの天面の操作面から表面型静電容量センサー23までの間隔が近くなり、感度を良くすることができるが、0.2mmより薄いと押圧操作中に割れてしまう。キートップ部32aの厚さを一定とすれば、キートップ部32aの操作面から表面型静電容量センサー23までの間隔が一定になり誤認識を起こし難くすることができる。
第3実施形態のセンサー一体照光式キーシート31では表面型静電容量センサー23を備える例を示したが、変形例のセンサー一体照光式キーシート31aでは表面型静電容量センサー13を備えることができる。
このようにしても、表面型静電容量センサー13とは別体に導光シートを備える必要が無く、照光時の明るさを導光シート13aで確保しながら、センサー一体照光式キーシート31a全体の厚さを薄くすることができる。
第4実施形態のセンサー一体照光式キーシート41を図6に示す。図6はセンサー一体照光式キーシート41の断面図である。本実施形態のセンサー一体照光式キーシート41が第3実施形態のセンサー一体照光式キーシート31と異なるのは、「操作部」としてのカバーシート42の構成である。その他の構成は、センサー一体照光式キーシート31と同じである。
キートップ42aの材質としては、透明性の高い熱可塑性樹脂や反応硬化性樹脂を使用する。例えば、ポリオレフィン系樹脂、ビニル系樹脂、アクリル系樹脂、ポリアミド系樹脂、ポリエステル系樹脂、ポリカーボネート樹脂、ポリウレタン系樹脂、ポリエーテル系樹脂、エポキシ系樹脂、シリコーン系樹脂、アルキド樹脂などが挙げられる。これらの樹脂の中でも加工性や強度の観点から、アクリル系樹脂、ポリカーボネート樹脂、ポリウレタン系樹脂、エポキシ系樹脂、シリコーン系樹脂を用いることが好ましい。キートップ部の厚さは、0.2mm~0.6mmとすることが好ましい。
カバーシート42bの材質としては、ポリエチレンテレフタレートフィルム、ポリブチレンテレフタレートフィルム、ポリウレタンフィルム、ポリアミドフィルム、ポリプロピレンフィルム、ポリスチレンフィルム、フッ素フィルム、アイオノマーフィルム、ポリカーボネートフィルム、ポリ塩化ビニルフィルムなどの樹脂フィルムを用いることができる。さらに、着色層や導光層を設けることができる。カバーシート42bの厚さは、薄型化の要請から、150μm以下が好ましく、50μm以下がより好ましい。
接着層42cの材質は、キートップ42aをカバーシート42bに固着でき、透光性を有する種々の接着剤を用いることができる。さらに透明であれば好ましい。例えば、紫外線硬化型樹脂、ホットメルト樹脂などが挙げられる。
第4実施形態のセンサー一体照光式キーシート41では表面型静電容量センサー23を備える例を示したが、変形例のセンサー一体照光式キーシート41aでは表面型静電容量センサー13を備えることができる。
このようにしても、表面型静電容量センサー13とは別体に導光シートを備える必要が無く、照光時の明るさを導光シート13aで確保しながら、センサー一体照光式キーシート41a全体の厚さを薄くすることができる。
第5実施形態のセンサー一体照光式キーシート51を図8に示す。図8はセンサー一体照光式キーシート51の断面図である。本実施形態のセンサー一体照光式キーシート51が第3実施形態のセンサー一体照光式キーシート31と異なるのは、カバー部材32を備えずに「操作部」としてのキートップ52aとフレームシート52eを備える点である。その他の構成は、センサー一体照光式キーシート31と同じである。
フレームシート52eは、キートップ52aどうしの間を埋めてさらにキートップ52a群の外周を囲むように形成されており、接着層52cによって表面型静電容量センサー23の操作面側に固着されている。
フレームシート52eの材質は、印刷層や蒸着層が形成できる樹脂フィルムを使用する。例えば、ポリエチレンテレフタレートフィルム、ポリブチレンテレフタレートフィルム、ポリウレタンフィルム、ポリアミドフィルム、ポリプロピレンフィルム、ポリスチレンフィルム、フッ素フィルム、アイオノマーフィルム、ポリカーボネートフィルム、ポリ塩化ビニルフィルムなどが挙げられる。またフレームシート52eの厚さは、キートップ52aの厚さよりやや薄い0.2mm~0.5mm程度が好ましい。なお、フレームシート52eとキートップ52aとを同等の誘電率を有する材料で形成することが好ましく、両者を同材質の材料で形成すれば、誘電率を同一にすることができる。
第5実施形態のセンサー一体照光式キーシート51では表面型静電容量センサー23を備える例を示したが、変形例のセンサー一体照光式キーシート51aでは表面型静電容量センサー13を備えることができる。
このようにしても、表面型静電容量センサー13とは別体に導光シートを備える必要が無く、照光時の明るさを導光シート13aで確保しながら、センサー一体照光式キーシート51a全体の厚さを薄くすることができる。
第6実施形態のセンサー一体照光式キーシート61を図10に示す。図10はセンサー一体照光式キーシート61の断面図である。本実施形態のセンサー一体照光式キーシート61が第5実施形態のセンサー一体照光式キーシート51と異なるのは、キートップ52aとフレームシート52eを備えずに「操作部」としてのカバーシート62を備える点である。その他の構成は、センサー一体照光式キーシート51と同じである。
第6実施形態のセンサー一体照光式キーシート61では表面型静電容量センサー23を備える例を示したが、変形例のセンサー一体照光式キーシート61aでは表面型静電容量センサー13を備えることができる。
このようにしても、表面型静電容量センサー13とは別体に導光シートを備える必要が無く、照光時の明るさを導光シート13aで確保しながら、センサー一体照光式キーシート61a全体の厚さを薄くすることができる。
第7実施形態のセンサー一体照光式キーシート71を図12に示す。図12はセンサー一体照光式キーシート71の断面図である。本実施形態のセンサー一体照光式キーシート71が第2実施形態のセンサー一体照光式キーシート21と異なるのは、表面型静電容量センサー23を備えずに投影型静電容量センサー73を備える点である。その他の構成は、センサー一体照光式キーシート21と同じである。
拡散層73bは拡散層23bと同様に、光の進路を操作面側へと変更する層であり、導光シート73aの裏面に対し押圧操作部に対応して形成されている。
第1電極73cはX座標またはY座標の一方を検出する部材であり、導光シート73aの裏面に対し透明樹脂層73eを介して形成されている。つまり第1電極73cは導光シート73aに接していない。この第1電極73cは並行に伸びる複数の導電膜で構成されている。
第2電極73dはX座標またはY座標の他方を検出する部材であり、導光シート73aの表面に対し透明樹脂層73eを介して形成されている。つまり第2電極73dも導光シート73aに接していない。この第2電極73dも並行に伸びる複数の導電膜で構成されており、伸長方向は第1電極73cの伸長方向と垂直に交差している。
透明樹脂層73eは透明樹脂層23dと同様に、導光シート73aの導光効率を高める層であり、導光シート73aの裏面に対しては拡散層73bを覆うようにして導光シート73aと略同等の大きさに形成されている。導光シート73aの表面に対しても導光シート73aと略同等の大きさに形成されている。この透明樹脂層73eは導光シート73aに対し非浸食性塗液を塗布して形成される透明な樹脂塗膜であり、導光シート73aとの接触面は平坦な平滑面1に形成されている。
また、導光シート73aの操作面側に表面シート12が接触状態で設けられているため、表面シート12の操作面と投影型静電容量センサー73との間隔を小さくすることができ、スライド入力操作の感度及び精度を高めることができる。よって正確なスライド入力操作を行えるセンサー一体照光式キーシート71を実現することができる。
第7実施形態のセンサー一体照光式キーシート71では投影型静電容量センサー73を備える例を示したが、変形例1のセンサー一体照光式キーシート71aでは投影型静電容量センサー76を備えることができる。
投影型静電容量センサー76は、基材となる導光シート76aの裏面に対し拡散層76bを覆うようにして第1電極76cが形成されており、さらにこの導光シート76aの裏面に対して第1電極76cを覆って導光シート76aと略同等の大きさの透明樹脂層76eが形成されている。導光シート76aの表面に対し第2電極76dが形成されており、さらにこの導光シート76aの表面に対して第2電極76dを覆って導光シート76aと略同等の大きさの透明樹脂層76eが形成されている。つまり第1電極76c、第2電極76dは導光シート76aに接している。
このようにしても、投影型静電容量センサー76とは別体に導光シートを備える必要が無く、照光時の明るさを導光シート76aで確保しながら、センサー一体照光式キーシート71a全体の厚さを薄くすることができる。
第7実施形態のセンサー一体照光式キーシート71では表面シート12を備える例を示したが、変形例2のセンサー一体照光式キーシート71bではカバー部材32を備えることができる。
このようにしても、カバー部材32がブロック形状に形成されるキートップ部32aを備えるため、押圧操作位置を目視と触感によって明確にすることができ、押圧入力操作を行い易くすることができる。また、センサー一体照光式キーシート71bについても、投影型静電容量センサー73に替えて投影型静電容量センサー76を備えることができる。
第7実施形態のセンサー一体照光式キーシート71では表面シート12を備える例を示したが、変形例3のセンサー一体照光式キーシート71cではカバーシート42を備えることができる。
このようにしても、投影型静電容量センサー73の操作面側をカバーシート42bで覆うことができ、投影型静電容量センサー73の操作面側を傷付け難くすることができる。また、キートップ42aの天面である操作面と投影型静電容量センサー73との間隔を小さくすることができ、スライド入力操作の感度及び精度を高めることができる。さらに導光シート23aの操作面側にミクロン単位の微細な空間42dを形成することができ、導光シート23a内を伝わる光は空間42dと接する表面で反射し易くなり、その表面から外部へ光を漏れ難くすることができる。また、センサー一体照光式キーシート71cについても、投影型静電容量センサー73に替えて投影型静電容量センサー76を備えることができる。
第7実施形態のセンサー一体照光式キーシート71では表面シート12を備える例を示したが、変形例4のセンサー一体照光式キーシート71dではキートップ52aとフレームシート52eを備えることができる。
このようにしても、キートップ52aの天面とフレームシート52eの天面でスライド操作面を構成するため、スライド操作面の段差を少なくすことができ、スライド操作面から投影型静電容量センサー73までの間隔を略一定に保つことができる。さらにキートップ52aとフレームシート52eを同等の誘電率の材料で形成すれば、投影型静電容量センサー73の精度を高めることができ、誤動作を起き難くすることができる。また、センサー一体照光式キーシート71dについても、投影型静電容量センサー73に替えて投影型静電容量センサー76を備えることができる。
第7実施形態のセンサー一体照光式キーシート71では表面シート12を備える例を示したが、変形例5のセンサー一体照光式キーシート71eではカバーシート62を備えることができる。
このようにしても、投影型静電容量センサー73の操作面側をカバーシート62bで覆うことができ、投影型静電容量センサー73における透明樹脂層73eを傷付け難くすることができる。また、キートップ62aやフレームシート62eの天面である操作面と投影型静電容量センサー73との間隔を小さくすることができ、スライド入力操作の感度及び精度を高めることができる。また、センサー一体照光式キーシート71eについても、投影型静電容量センサー73に替えて投影型静電容量センサー76を備えることができる。
以下に、各実施形態のセンサー一体照光式キーシート11,21,31,41,51,61,71およびそれらの各変形例に共通する変形例を説明する。
さらに押し子体も無くしてセンサー一体照光式キーシートの裏面側を平坦にすることができる。このようにすれば、センサー一体照光式キーシートを薄型化することができる。
2 粗面
11 センサー一体照光式キーシート(第1実施形態)
12 表面シート(操作部)
13 表面型静電容量センサー
13a 導光シート(基材)
13b 拡散層
13c 電極
13d 透明樹脂層
14 遮光印刷層
15 押し子シート
15a 押し子部
15b ベース部
21 センサー一体照光式キーシート(第2実施形態)
23 表面型静電容量センサー
23a 導光シート(基材)
23b 拡散層
23c 電極
23d 透明樹脂層
31 センサー一体照光式キーシート(第3実施形態)
31a センサー一体照光式キーシート(第3実施形態の変形例)
32 カバー部材(操作部)
32a キートップ部
32b ベース部
41 センサー一体照光式キーシート(第4実施形態)
41a センサー一体照光式キーシート(第4実施形態の変形例)
42 カバー部材(操作部)
42a キートップ
42b カバーシート
42c 接着層
42d 空間
51 センサー一体照光式キーシート(第5実施形態)
51a センサー一体照光式キーシート(第5実施形態の変形例)
52a キートップ(操作部)
52c 接着層
52e フレームシート(操作部)
61 センサー一体照光式キーシート(第6実施形態)
61a センサー一体照光式キーシート(第6実施形態の変形例)
62 カバー部材(操作部)
62a キートップ
62b カバーシート
62c 接着層
62d 空間
62e フレームシート
71 照光式キーシート(第7実施形態)
71a センサー一体照光式キーシート(第7実施形態の変形例1)
71b センサー一体照光式キーシート(第6実施形態の変形例2)
71c センサー一体照光式キーシート(第6実施形態の変形例3)
71d センサー一体照光式キーシート(第6実施形態の変形例4)
71e センサー一体照光式キーシート(第6実施形態の変形例5)
73 投影型静電容量センサー
73a 導光シート(基材)
73b 拡散層
73c 第1電極
73d 第2電極
73e 透明樹脂層
76 投影型静電容量センサー
76a 導光シート(基材)
76b 拡散層
76c 第1電極
76d 第2電極
76e 透明樹脂層
111 センサー一体照光式キーシート(従来技術)
112 キー部材
113 導光板
113a 凸部
114 押圧シート
115 座標入力手段
115a 基材
115b 第1電極
115c 第2電極
116 空気層
Claims (11)
- 光を伝える導光シートと、導光シートの操作面側に接触状態で設ける操作部と、スライド入力操作に用いる静電容量センサーと、を備えるセンサー一体照光式キーシートであって、
静電容量センサーは、導光シートによる基材と、その導光シートの操作面側または操作面側とは反対の裏面側の少なくとも一方に形成される電極と、でなるセンサー一体照光式キーシート。 - 操作部がブロック形状に形成される複数のキートップを備える請求項1記載のセンサー一体照光式キーシート。
- 操作部が、キートップどうしの間にフレームシートを備える請求項2記載のセンサー一体照光式キーシート。
- キートップとフレームシートが同等の誘電率の材料でなる請求項3記載のセンサー一体照光式キーシート。
- キートップを導光シートの操作面側に積層するカバーシートに設ける請求項2~請求項4何れか1項記載のセンサー一体照光式キーシート。
- カバーシートにおける導光シートとの対向面が、ブラスト面である請求項5記載のセンサー一体照光式キーシート。
- 操作部が一定の厚さに形成される平板形状の表面シートである請求項1記載のセンサー一体照光式キーシート。
- 導光シートと電極との間に、透明樹脂層を設ける請求項1~請求項7何れか1項記載のセンサー一体照光式キーシート。
- 透明樹脂層が導光シートより屈折率の低い樹脂でなる請求項8記載のセンサー一体照光式キーシート。
- 導光シートと透明樹脂層との接触面が平滑面である請求項8または請求項9記載のセンサー一体照光式キーシート。
- 導光シートの裏面側に、遮光印刷層を設ける請求項1~請求項10何れか1項記載のセンサー一体照光式キーシート。
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US13/518,808 US8854313B2 (en) | 2009-12-28 | 2010-12-21 | Sensor-integrated illuminated key sheet |
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CN101989507B (zh) * | 2009-07-30 | 2013-05-29 | 比亚迪股份有限公司 | 一种按键 |
US20140141129A1 (en) * | 2012-11-20 | 2014-05-22 | Morton Greene | Disposable container with signal producing elements |
JP6245257B2 (ja) * | 2013-04-04 | 2017-12-13 | ソニー株式会社 | 入力装置及び電子機器 |
CN103970280A (zh) * | 2014-04-24 | 2014-08-06 | 苏州达方电子有限公司 | 游标装置及键盘 |
JP6712373B2 (ja) * | 2014-09-12 | 2020-06-24 | 積水ポリマテック株式会社 | センサシート及びセンサパネル |
US10216285B2 (en) * | 2015-02-02 | 2019-02-26 | Microsoft Technology Licensing, Llc | Backlit illumination of electronics |
EP3168715B1 (en) * | 2015-11-16 | 2019-02-27 | SRG Global Liria, S.L.U. | Plastic moulding with seamless human-to-vehicle interface integration |
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CN102687223B (zh) | 2015-12-16 |
CN102687223A (zh) | 2012-09-19 |
US8854313B2 (en) | 2014-10-07 |
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