CN102253447A - Optical waveguide and optical touch panel - Google Patents
Optical waveguide and optical touch panel Download PDFInfo
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- CN102253447A CN102253447A CN2010101828783A CN201010182878A CN102253447A CN 102253447 A CN102253447 A CN 102253447A CN 2010101828783 A CN2010101828783 A CN 2010101828783A CN 201010182878 A CN201010182878 A CN 201010182878A CN 102253447 A CN102253447 A CN 102253447A
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Abstract
The invention discloses an optical waveguide and an optical touch panel. Compared the common optical touch panel, the optical touch panel using the optical waveguide has higher anti-interference performance in principle. However, the optical touch panel cannot fully block interference; and under the very bright environment, such as the outdoor environment, the optical touch panel is still difficult to use. A coating (14) comprises a pigment mixture of more than two kinds of pigment. The pigment mixture can efficiently absorb the light in a visible area compared with the light in a near-infrared area; and interference light entering the visible area of the coating (14) is efficiently absorbed, while signals in the near-infrared area are hardly absorbed. The amount of the interference light entering the visible area of a core (12) from the coating (14) is greatly reduced, and the optical touch panel (20) can be used in the outdoor.
Description
Technical field
The present invention relates to optical waveguide and the optical touch panel that utilizes this optical waveguide.
Background technology
In optical touch panel, in order to obtain good characteristic, it is important removing stray light.In general optical touch panel, light-emitting component and photo detector are arranged in the periphery of coordinate input area relative to each other.In this case, the countermeasure as removing stray light is provided with the sealing resin (shading member) (for example patent documentation 1) that is used to absorb visible light on photo detector.
But in the optical touch panel of this structure, photo detector is arranged near the coordinate input area that stray light directly enters.Therefore, only be difficult to remove stray light with the shading member.
With respect to this, known have between light-emitting component and coordinate input area and the optical touch panel that is provided with optical waveguide between coordinate input area and photo detector.In this optical touch panel, the light signal that comes self-emission device injects to the coordinate input area by after the optical waveguide.In addition, the light signal that has passed through the coordinate input area arrives photo detector (for example patent documentation 2) by after the optical waveguide.The optical touch panel of this structure need not to arrange photo detector at the periphery of coordinate input area.Therefore, compare with general optical touch panel, anti-interference light disturbs stronger.
Patent documentation 1: Japanese kokai publication hei 11-86698 communique
Patent documentation 2: TOHKEMY 2008-203431 communique
But,, can't say fully to have stoped stray light even in the optical touch panel that has used optical waveguide.Under very bright environment, for example outdoor, still be difficult to use optical touch panel.
Summary of the invention
Even the inventor has carried out deep research to the exploitation at the outdoor optical touch panel that also can use.As a result, the optical characteristics and the stray light that are conceived to light-emitting component, photo detector produce the mechanism of production of disturbing, and have finished the present invention.In addition, in this manual, so-called " near infrared region " is meant that wavelength is that 700nm is above and less than the zone of 2500nm.In addition, so-called " visibility region " is meant that wavelength is that 400nm is above and less than the zone of 700nm.In addition, so-called " ultraviolet region " is meant that wavelength is that 1nm is above and less than the zone of 400nm.
Fig. 1 represents the representational optical wavelength zone that is subjected to of the representational emission wavelength and the photo detector of light-emitting component.As shown in Figure 1, the light-emitting component that generally is used for optical touch panel sends the light of near infrared region (for example 850nm).With respect to this, the photo detector that generally is used for optical touch panel is not only accepted the light of near infrared region, also accepts the light of visibility region.As a result, photo detector is not only accepted from the light of the near infrared region of light-emitting component ejaculation, also accepts to see through coating and enter the stray light of the visibility region in the core.Therefore, produce the interference that brings by stray light.
Therefore, the inventor makes coating contain the colorant mixture that is made of two or more pigments.Compare with near infrared region, this colorant mixture absorbs the light of visibility region more strongly.Therefore, the stray light that has entered the visibility region of coating is absorbed strongly, yet the flashlight of near infrared region is absorbed hardly.Thus, can reduce the stray light that enters the visibility region in the core through coating significantly.Even and found also can use optical touch panel outdoor.
Technical scheme of the present invention is as follows.
(1) optical waveguide of the present invention is the optical waveguide that has coating and be embedded in the core of coating.Light transmission coating, visibility region is lower than the light transmission of near infrared region.This means following situation.When the Optical transmission spectrum of near infrared region and visibility region was compared, the transmissivity of any wavelength of visibility region was lower than the transmissivity of any wavelength of near infrared region.
(2) in optical waveguide of the present invention, coating contains the colorant mixture that is made of two or more pigments.Light transmission colorant mixture, visibility region is lower than the light transmission of near infrared region.
(3) in optical waveguide of the present invention, coating also contains ultraviolet curable resin.Light transmission colorant mixture, ultraviolet region is higher than the light transmission of visibility region.This means following situation.When the transmitted spectrum of visibility region and ultraviolet region was compared, there was the high wavelength of transmissivity than any wavelength of visibility region in ultraviolet region.
(4) in optical waveguide of the present invention, the light transmission of coating is more than 80% at wavelength during for 850nm, the light transmission of coating is more than the 400nm and is less than 15% in the whole zone less than 700nm at wavelength, and the light transmission of coating is more than 10% at wavelength during for 365nm.
(5) in optical waveguide of the present invention, the thickness of coating is 10 μ m～1500 μ m.
(6) in optical waveguide of the present invention, the part that the light ejecting end with core of coating covers, or the part that the light incident side with core of coating covers forms lens arrangement.
(7) optical touch panel of the present invention has above-mentioned optical waveguide.
Adopt the present invention, even can realize the outdoor optical touch panel that also can use under the direct sunlight irradiation.
Description of drawings
Fig. 1 is the figure in the zone that is subjected to optical wavelength of expression emission wavelength of light-emitting component and photo detector.
(a) of Fig. 2 is the stereographic map of optical waveguide of the present invention, (b) is the cut-open view of optical waveguide of the present invention, (c) is the cut-open view of optical waveguide of the present invention.
(a) of Fig. 3 is the vertical view of optical touch panel of the present invention, (b) is the cut-open view of optical touch panel of the present invention.
Fig. 4 is the curve map of the transmitted spectrum of embodiment and comparative example, second coating.
Fig. 5 is the measurement curve map that the stray light of embodiment and comparative example disturbs.
Embodiment
Optical waveguide
Optical waveguide of the present invention has coating and is embedded in the core of coating.Optical waveguide of the present invention also can have other composed component (for example substrate) except having coating and core.
The embodiment of optical waveguide of the present invention is not particularly limited, and for example lists the embodiment shown in (a)～(c) of Fig. 2.(a) of Fig. 2 is the stereographic map of the optical waveguide 10 of one embodiment of the present invention.(b) of Fig. 2 is along the line segment A-B side cross sectional view of the optical waveguide of Fig. 2 (a).(c) of Fig. 2 is along the line segment C-D side cross sectional view of the optical waveguide of Fig. 2 (a).
Shown in Fig. 2 (a)～(c), in optical waveguide 10 of the present invention, stack gradually first coating 11, a plurality of core 12, second coating 13 according to the order of first coating 11, a plurality of core 12, second coating 13.First coating 11 and second coating 13 lumped together only be called coating 14.Because a plurality of cores 12 separate each other, so become the structure that is embedded with core 12 in coating 14.
In (a)～(c) of Fig. 2, be formed with lens arrangement 13a at the end face of second coating 13.This is the light longitudinal diffusion of penetrating from core 12 in order to suppress.Also be to draw in the vertical for the light that will incide core 12.In order to improve the utilization ratio of flashlight, be preferably formed such lens arrangement 13a.But, also can not form lens arrangement 13a.
The material of the material of first coating 11 and second coating 13 both can be identical, also can be different.But, in order to reduce manufacturing cost, same material preferably.
The purposes of optical waveguide 10 of the present invention is not defined.Optical waveguide 10 of the present invention can be used in optical touch panel, optical sensor etc., but is particularly preferred for optical touch panel.
Coating
The used coating 14 of the present invention contains the colorant mixture that is made of two or more pigments.Compare with the light of near infrared region, colorant mixture absorbs the light of visibility region strongly.Therefore, can reduce the stray light of the visibility region that enters core 12.This coating 14 is used to have under the situation of optical touch panel of optical waveguide, the influence of stray light can be reduced a lot.As a result, can use optical touch panel outdoor.
As coating 14, its light transmission to visibility region is lower than the light transmission near infrared region, also can be the formation that contains a kind of pigment.As the example of such pigment, can list the anthraquinone pigments that black pigments such as C.I.Solvent Black 27,28,2G and Japanese kokai publication hei 9-3311 communique are put down in writing.
But, in the coating 14 that only contains a kind of such pigment, be difficult to realize as described later such shown in Fig. 4 (embodiment), at the high spectrum of ultraviolet region transmissivity.Under the situation that is not the high spectrum of ultraviolet region transmissivity, contain ultraviolet curable resin owing to be difficult to make in coating 14, the core 12, so lack practicality.
If the coating 14 that adopts the present invention to use then need not to append the shading member in addition, thus optical touch panel can miniaturization, slimming.
The coating 14 that the present invention uses absorbs the light of visibility region strongly, but absorbs the light of near infrared region hardly.Therefore, when the light of the near infrared region that penetrates from light-emitting component was propagated core 12 in, the light of near infrared region can be subjected to the influence of core 12 coating 14 on every side hardly and decay.
According to identical reason, shown in Fig. 2 (a)～(c), under the situation of outside ejaculation, the light of near infrared region hardly can be owing to lens arrangement 13a decays by being formed on the lens arrangement 13a on the coating 14 for the light of the near infrared region of propagating in core 12.In addition, incide under the situation of core 12 by the lens arrangement 13a that is formed on the coating 14 at the light of near infrared region, the light of near infrared region hardly can be owing to lens arrangement 13a decays.
Preferably with absorb 800nm more than and compare less than the light of the wavelength region may of 1000nm, it is above and less than the light of the wavelength region may of 650nm that colorant mixture absorbs 500nm more strongly.And, more preferably with absorb 750nm more than and compare less than the light of the wavelength region may of 1500nm, it is above and less than the light of the wavelength region may of 700nm that colorant mixture absorbs 400nm more strongly.
The coating 14 that the present invention uses preferably also contains ultraviolet curable resin.Because the pattern of ultraviolet curable resin formation property excellence is so by containing ultraviolet curable resin, can access the high coating of pattern precision.And the set time of ultraviolet curable resin is short, and general release property is than heat reactive resin excellence, so the throughput rate height.
Preferably compare with the light that absorbs visibility region, the colorant mixture that the coating 14 that the present invention uses is contained absorbs the light of ultraviolet region more weakly.Thus, even contain colorant mixture, the light of ultraviolet region does not die down yet, so can't hinder the curing of the ultraviolet curable resin that coating contains.
Colorant mixture just is not particularly limited as long as compare and absorb the light of visibility region doughtily with the light of absorption near infrared region.As colorant mixture, for example listed this chemical industrial company system " FS-Black 1927 ".
The amount of the colorant mixture in the coating 14 that preferred the present invention uses is 0.01 weight %～5 weight %.If less than 0.01 weight %, then might reducing fully, the amount of colorant mixture enters the stray light of the visibility region in the core 12 through coating 14.If the amount of colorant mixture is greater than 5 weight %, then when the outside was penetrated, optical transmission was hindered the light that for example might propagate in core 12 by being formed on the lens arrangement 13a on the coating 14.
Above-mentioned ultraviolet curable resin so long as resin that can ultraviolet curing just be not particularly limited.As ultraviolet curable resin, for example enumerated ADEKA corporate system " EP4080E ".
The preferred 80.0 weight % of the amount of the ultraviolet curable resin in the coating 14 that the present invention uses～99.9 weight %.If the amount of ultraviolet curable resin is less than 80.0 weight %, then pattern formation property might variation.If the amount of ultraviolet curable resin is greater than 99.9 weight %, then the light absorption of visibility region might diminish.
The light transmission of the coating 14 that the present invention uses is more than 80% when wavelength 850nm preferably, is more preferably more than 85%, further preferably more than 90%.In addition, the light transmission of the coating 14 that the present invention uses more than wavelength 400nm and less than in the whole wavelength region may of 700nm preferably less than 15%, be more preferably less than 14.5%.In addition, the light transmission of the coating 14 that the present invention uses preferably more than 10%, is more preferably more than 13%, further preferably more than 15% when wavelength 365nm.
The light transmission of the coating 14 that the present invention uses is more than 80% when wavelength 850nm.Thus, when the light that can prevent the near infrared region that penetrates from light-emitting component was propagated core 12 in, the light of near infrared region was owing to the influence of core 12 coating 14 on every side decays.In addition, when the outside was penetrated, the light of near infrared region was owing to coating 14 is decayed by being formed on the lens arrangement 13a on the coating 14 to prevent in core 12 light propagated.
The light transmission of the coating 14 that the present invention uses more than wavelength 400nm and less than in the whole zone of the wavelength of 700nm less than 15%.Therefore, can reduce the stray light that enters the visibility region in the core 12.Thus, even for example in the illumination (direct sunlight degree) of 100000lux, the also influence of light without interruption.
The transmissivity of the coating 14 that the present invention uses is more than 10% when wavelength 365nm.Therefore, the ultraviolet curable resin in the coating 14 is solidified.
The thickness of the coating 14 that the present invention uses is 10 μ m～1500 μ m preferably.If the thickness of coating 14 then might absorb the stray light of visibility region fully less than 10 μ m.If the thickness of coating 14 is greater than 1500 μ m, then being solidified with of ultraviolet curable resin in the coating 14 may need very big energy.
The coating 14 that the present invention uses can utilize method manufacturings such as the dry ecthing method that used plasma, replica method, exposure-development method, photobleaching method.
The coating 14 that the present invention uses both can be a monolayer constructions will, also can be the lit-par-lit structure of multilayer.Have at coating 14 under the situation of lit-par-lit structure, needing only wherein at least, one deck (for example second coating 13) contains colorant mixture.
Core
The core 12 that the present invention uses is formed by the high material of refractive index for light wavelength transmissivity height of being propagated and refractive index ratio coating 14.Form the ultraviolet curable resin of material preferred pattern formation property excellence of core 12.As ultraviolet curable resin, preferred acrylic compounds ultraviolet curable resin, epoxies ultraviolet curable resin, type siloxane ultraviolet curable resin, norborene class ultraviolet curable resin, polyimide ultraviolet curable resin etc.
Plane (overlooking) shape of the core 12 that the present invention uses is not particularly limited, and can list linearity, curve-like etc.Since can be expeditiously with the light propagated to the guiding of coordinate input area, so the preferred L word shape shown in Fig. 2 (a) of the flat shape of core 12.
The cross sectional shape of the core 12 that the present invention uses is not particularly limited.Shown in Fig. 2 (b), the rectangle of the cross sectional shape preferred pattern of core 12 formation property excellence or trapezoidal.The length on the base of core 12 (width of core 12) is 100 μ m～500 μ m preferably.The height of core 12 is 10 μ m～100 μ m preferably.
The core 12 that the present invention uses can utilize method manufacturings such as the dry ecthing method that used plasma, replica method, exposure-development method, photobleaching method.
Preferred core 12 and coating 14, be more than 0.01 for the largest refractive index difference of the light wavelength of the propagation core of using in the present invention 12 in, be more preferably 0.02～0.3.The light wavelength of propagating in core 12 is identical with the light wavelength that penetrates from light-emitting component, for example is 850nm.
Can utilize the kind import to the organic group in the resin and amount to increase or reduces the refractive index of the resin of core 12 that formation the present invention uses and coating 14.For example, when the base (phenyl etc.) with ring-type aromatic series imported in the molecular resin, it is big that the refractive index of resin becomes.In addition, if increase the amount of the base of the ring-type aromatic series in the molecular resin, then the refractive index of resin becomes big.On the contrary, for example when importing in the molecular resin, the refractive index of resin diminishes with the base (methyl, norbornene etc.) of the straight chain or the ring-shaped fat same clan.In addition, if the amount of the base of the straight chain in the increase molecular resin or the ring-shaped fat same clan, then the refractive index of resin diminishes.
Optical touch panel
Optical touch panel of the present invention has optical waveguide of the present invention.Therefore, optical touch panel of the present invention can miniaturization, slimming, even and also can use outdoor.
An example of the preferred implementation of (a) expression optical touch panel 20 of the present invention of Fig. 3.Optical touch panel 20 of the present invention comprises: coordinate input area 21; Penetrate the light-emitting component 22 of the light of near infrared region; Accept the photo detector 23 of the light of near infrared region and visibility region.Also has first optical waveguide of being located between coordinate input area 21 and the light-emitting component 22 24.Also has second optical waveguide of being located between coordinate input area 21 and the photo detector 23 25.The end face of coordinate input area 21 sides of first optical waveguide 24 is relative across coordinate input area 21 with the end face of coordinate input area 21 sides of second optical waveguide 25.At least use optical waveguide of the present invention at second optical waveguide 25 that is connected with photo detector 23.
In optical touch panel 20, the light that utilizes optical waveguide 25 to propagate is directed to photo detector 23.Thus, compare, also can significantly reduce the quantity of required photo detector 23 with the optical touch panel that does not use optical waveguide.And the degree of freedom of photo detector 23 configurations is also high, therefore, compares with the optical touch panel that does not use optical waveguide, is subjected to the influence of stray light few.
And, in optical touch panel 20 of the present invention, in the coating 25a of second optical waveguide 25 that is connected with photo detector 23, contain the colorant mixture of the light that absorbs visibility region strongly at least.Thus, the stray light that can prevent visibility region is propagated in core 25b and is arrived photo detector 23.As a result, even can realize at the high outdoor optical touch panel that also can use 20 of illumination.
The purposes of optical touch panel 20 of the present invention is not particularly limited.Optical touch panel 20 of the present invention for example is widely used in guidance panel of office equipments such as portable equipments such as commons input media, mobile phone, game machine, duplicating machine such as the ATM of automatic machine, bank, auto navigation, POS system, industrial machinery etc.
The coordinate input area
So-called " coordinate input area 21 " is meant in optical touch panel 20 zone of carrying out the coordinate input with people's finger and nib etc. in this instructions.In optical touch panel 20 of the present invention, photo detector 23 plays a role as sensor.Therefore, on coordinate input area 21, need not ITO film etc., as the coverlay (layers of film, glass etc.) of sensor.
(b) of Fig. 3 is an example, the schematic cut-open view of the preferred implementation of optical touch panel 20 of the present invention.The light 26 that penetrates from light-emitting component 22 passes through in the core 24b that is embedded in coating 24a of first optical waveguide 24, passes through in air on coordinate input area 21.Afterwards, light 26 passes through in the core 25b that is embedded in coating 25a of second optical waveguide 25, arrives photo detector 23.
Shown in Fig. 3 (b), preferred coordinate input area 21 below also have transparent panel 27.This is for the liquid crystal indicator of protecting the below of being located at coordinate input area 21, plasm display device.Transparent panel 27 is not particularly limited, uses glass plate, acrylic panel etc.The thickness of preferably clear panel 27 is 10 μ m～5mm.
Light-emitting component-photo detector
The light-emitting component 22 that the present invention uses is the elements that send the light of near infrared region.As light-emitting component 22, preferred light emitting diode or semiconductor laser, more preferably VCSEL (vertical resonance surface emitting laser).VCSEL makes light along the direction resonance vertical with real estate, can penetrate the light of the direction vertical with face, so light transmits excellence.Preferably the light wavelength that penetrates from light-emitting component 22 is near infrared region.
The used photo detector 23 of the present invention is elements of accepting the light of visibility region and near infrared region and light signal being converted to electric signal.As photo detector 23, preferred light electric transistor, photodiode, more preferably cmos image sensor, ccd image sensor.
Embodiment
The modulation of the formation material of coating 14
. (composition A) contains epoxy resin (ADEKA corporate system, EP4080E) 100 weight portions the cycloaliphatic ring skeleton, the energy ultraviolet curing
. (composition B) light acid producing agent (san-apro corporate system, CPI-200K) 2 weight portions
. the colorant mixture that (composition C) is made of 4 kinds of pigments (has this chemical industrial company system, FS-Black1927) 0.1 weight portion
Above-mentioned composition is mixed, modulated the formation material of first coating 11 and second coating 13.
The modulation of the formation material of core 12
. (components D) contains epoxy resin (Osaka Gas Chemicals corporate system, OGSOL EG) 40 weight portions fluorene skeleton, the energy ultraviolet curing
. (composition E) contains epoxy resin (Nagase ChemteX Corporation system, EX-1040) 30 weight portions fluorene skeleton, the energy ultraviolet curing
. (composition F) 1,3,3-three (4-(2-(3-oxetanyl) butoxy phenyl) butane 30 weight portions
. mentioned component B 1 weight portion
. (composition G) ethyl lactate 41 weight portions
Above-mentioned composition is mixed, modulated the formation material of core 12.
The making of optical waveguide 10
The formation of first coating 11
(surface of 150mm * 150mm * 0.188mm) has applied the formation material of coating with applicator at PEN (PEN) film.Afterwards, to whole with 1000mJ/cm
2Irradiation ultraviolet radiation exposes.Then, with 80 ℃ of heat treated of having carried out 5 minutes, formed first coating 11.Having measured the thickness of first coating 11 with the contact film thickness gauge, is 20 μ m.In addition, the refractive index of first coating 11 when wavelength is 830nm is 1.510.
The formation of core 12
Utilize applicator to apply the formation material of core 12 on first coating, 11 surfaces.Then, with 100 ℃ of dried of having carried out 5 minutes.Then, mounting is printed with the photomask of synthetic quartz system of the pattern of regulation.Use i tape bandpass filter, by proximity printing method (spacing 100 μ m) with 2500mJ/cm
2Carried out ultraviolet irradiation exposure (peak wavelength is 365nm).Afterwards, with 100 ℃ of heat treated of having carried out 10 minutes.
Then, develop by using the gamma-butyrolacton aqueous solution, unexposed portion is removed in dissolving.Afterwards, with 120 ℃ of heat treated of having carried out 5 minutes, formed core 12.
Measured the sectional dimension of core 12 with microscope, width is 20 μ m, highly is 50 μ m.And the refractive index of core 12 when wavelength is 830nm is 1.592.
The formation of second coating 13
Utilize applicator to apply the formation material of second coating 13 at first coating 11 and core 12 surfaces.Then, the mould of the quartz system of negative-type with lens arrangement is pressurizeed, to whole with 5000mJ/cm
2Carried out ultraviolet irradiation exposure (peak wavelength is 365nm).Then, with 80 ℃ of heat treated of having carried out 5 minutes.Afterwards, carry out the demoulding, formed second coating 13 of the lens arrangement 13a shown in (a)～(c) with Fig. 2.The thickness of second coating 13 is 1000 μ m.
The transmitted spectrum of second coating 13 of the optical waveguide 10 of Fig. 4 (embodiment) expression embodiment.The light transmission of second coating 13 of the optical waveguide 10 of embodiment is 95% when wavelength 850nm, is less than 15% in the whole zone of wavelength 400nm～700nm, is 14% when wavelength 365nm.The refractive index of second coating 13 when wavelength is 830nm is 1.510.(this chemical industrial company system is arranged, and transmitted spectrum FS-Black1927) is roughly consistent for the transmitted spectrum of second coating 13 and colorant mixture.Only be difficult to obtain near peak value spectrum, the 380nm of the embodiment of Fig. 4 by a kind of pigment.That is, only by a kind of pigment, the transmissivity that is difficult to reduce the transmissivity of visibility region and improves ultraviolet region.Therefore, in an embodiment, used the colorant mixture that is mixed with two or more pigments.
The making of optical touch panel 20
Image pattern 3 makes up 2 optical waveguides 10 being made by embodiment like that, has made optical touch panel 20.The end of first optical waveguide 24 link light-emitting component 22 that the light that penetrates wavelength 850nm is arranged (the Optwell corporate system, VCSELL).End binding at second optical waveguide 25 has photo detector 23 (TAOS corporate system, CMOS linear sensor array).The incident end of the ejecting end of optical waveguide 24 and optical waveguide 25 has been made optical touch panel shown in Figure 3 20 (3 inches at diagonal angle) across the 21 relative configurations of coordinate input area.
Comparative example
The modulation of the formation material of coating
The formation material of the coating of comparative example is not except containing colorant mixture, and is identical with the formation material of the coating 14 of embodiment.That is,
. (composition A) contains epoxy resin (ADEKA corporate system, EP4080E) 100 weight portions the cycloaliphatic ring skeleton, the energy ultraviolet curing
. (composition B) light acid producing agent (san-apro corporate system, CPI-200K) 2 weight portions
Above composition A and composition B are mixed, modulated first coating of comparative example and the formation material of second coating.
The modulation of the formation material of core
The formation material of the core of comparative example is identical with the formation material of the core 12 of embodiment.
The making of optical waveguide
Except the conditions of exposure of second coating, made the optical waveguide of comparative example in the same manner with embodiment.Owing in second coating of comparative example, do not contain colorant mixture, the exposure of ultraviolet ray irradiation is reduced to 2000mJ/cm
2In addition, because the first coating thickness is thin, so it is little not contain the influence of colorant mixture.Therefore, conditions of exposure is identical with embodiment.
The transmitted spectrum of second coating of Fig. 4 (comparative example) expression comparative example.The light transmission of second coating of comparative example is 92% when wavelength 850nm, is more than 75% and less than 92% in the whole zone of wavelength 400nm～700nm, is 52% when wavelength 365nm.So second coating of the comparative example not only transparency of the transparency height of near infrared region but also visibility region is also high.
The making of optical touch panel
Image pattern 3 makes up 2 optical waveguides being made by comparative example like that, has made the optical touch panel of comparative example.Light-emitting component, photo detector is identical with embodiment.
The evaluation that stray light disturbs
In the darkroom, for the optical touch panel of embodiment and comparative example, penetrating intensity from light-emitting component is the light of 5000 μ W, is all received the light of 4.0 μ W by photo detector.
The optical touch panel of configuration embodiment and comparative example has been measured the interference light intensity that photo detector receives under various measurement environment.Measurement result is illustrated in table 1 and Fig. 5.
Table 1
Stray light interference strength (saturation value=4.0 μ W)
| Measurement environment illumination (lux) | Darkroom 1 | Under the fluorescent light 1,000 | Indoor when closing window 5,000 | Outdoor shady spot 26,000 | Direct sunlight 100,000 |
| Embodiment (μ W) | 0 | 0.1 | 0.2 | 0.3 | 0.4 |
| Comparative example (μ W) | 0 | 0.5 | 2.7 | 3.7 | 3.7 |
Containing in coating in the optical touch panel 20 of embodiment of colorant mixture, when the illumination (brightness of direct sunlight) of 100000lux, be subjected to light intensity little, is 0.4 μ W, in the interference strength scope that can use.With respect to this, do not contain in the optical touch panel of comparative example of colorant mixture at coating, when illumination is 26000lux (brightness of outdoor shady spot), be subjected to light intensity to become 3.7 μ W, can not use.
Measuring method
Refractive index
(SAIRON TECHNOLOGY corporate system SPA-4000) has been measured refractive index to use prism coupler.
Core width, core height
(the DISCO corporate system DAD522) is carried out the cross section to optical waveguide and is cut off, and (Keanes Ltd.'s system VHX-200) is observed section, has measured core width, core height with microscope with cutting machine.
Transmitted spectrum
(it is made that Hitachi makes, and U-4100) coating of the thickness 1000 μ m that form on glass substrate measured transmitted spectrum with spectrophotometer.In addition, as a reference, measured the transmitted spectrum that does not form the glass substrate of coating.
Claims (8)
1. optical waveguide, the core that it has coating and is embedded in above-mentioned coating, wherein,
Light transmission above-mentioned coating, visibility region is lower than the light transmission of near infrared region.
2. optical waveguide according to claim 1, wherein,
Above-mentioned coating contains the colorant mixture that is made of two or more pigments,
Light transmission above-mentioned colorant mixture, visibility region is lower than the light transmission of near infrared region.
3. optical waveguide according to claim 1 and 2, wherein,
Above-mentioned coating also contains ultraviolet curable resin,
Light transmission above-mentioned colorant mixture, ultraviolet region is higher than the light transmission of visibility region.
4. optical waveguide according to claim 1 and 2, wherein,
The light transmission of above-mentioned coating is more than 80% at wavelength during for 850nm,
The light transmission of above-mentioned coating is more than the 400nm and is less than 15% in the whole zone less than 700nm at wavelength,
The light transmission of above-mentioned coating is more than 10% at wavelength during for 365nm.
5. optical waveguide according to claim 3, wherein,
The light transmission of above-mentioned coating is more than 80% at wavelength during for 850nm,
The light transmission of above-mentioned coating is more than the 400nm and is less than 15% in the whole zone less than 700nm at wavelength,
The light transmission of above-mentioned coating is more than 10% at wavelength during for 365nm.
6. optical waveguide according to claim 1 and 2, wherein,
The thickness of above-mentioned coating is 10 μ m～1500 μ m.
7. optical waveguide according to claim 1 and 2, wherein,
The part that the light ejecting end with above-mentioned core of above-mentioned coating covers, or the part that the light incident side with above-mentioned core of above-mentioned coating covers forms lens arrangement.
8. optical touch panel, it has claim 1 or 2 described optical waveguides.
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| CN2010101828783A CN102253447A (en) | 2010-05-21 | 2010-05-21 | Optical waveguide and optical touch panel |
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| JP2020134799A (en) * | 2019-02-22 | 2020-08-31 | Ａｇｃ株式会社 | Polymer optical waveguide |
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| US20070253717A1 (en) * | 2005-10-24 | 2007-11-01 | Rpo Pty Limited | Optical Elements for Waveguide-based Optical Touch Screens |
| JP2008203431A (en) * | 2007-02-19 | 2008-09-04 | Nitto Denko Corp | Optical waveguide for touch panel |
| CN101587206A (en) * | 2008-05-19 | 2009-11-25 | 日东电工株式会社 | Manufacturing method of optical waveguide device |
| CN101644977A (en) * | 2008-08-06 | 2010-02-10 | 日东电工株式会社 | Optical touch panel |
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| US20070253717A1 (en) * | 2005-10-24 | 2007-11-01 | Rpo Pty Limited | Optical Elements for Waveguide-based Optical Touch Screens |
| JP2008203431A (en) * | 2007-02-19 | 2008-09-04 | Nitto Denko Corp | Optical waveguide for touch panel |
| CN101587206A (en) * | 2008-05-19 | 2009-11-25 | 日东电工株式会社 | Manufacturing method of optical waveguide device |
| CN101644977A (en) * | 2008-08-06 | 2010-02-10 | 日东电工株式会社 | Optical touch panel |
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| JP2020134799A (en) * | 2019-02-22 | 2020-08-31 | Ａｇｃ株式会社 | Polymer optical waveguide |
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Application publication date: 20111123 |