CN111164502A - Light irradiation device and light irradiation method - Google Patents
Light irradiation device and light irradiation method Download PDFInfo
- Publication number
- CN111164502A CN111164502A CN201880063181.9A CN201880063181A CN111164502A CN 111164502 A CN111164502 A CN 111164502A CN 201880063181 A CN201880063181 A CN 201880063181A CN 111164502 A CN111164502 A CN 111164502A
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- Prior art keywords
- polarized light
- light
- film tape
- irradiation
- light irradiation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Polarising Elements (AREA)
Abstract
Provided is a light irradiation device and the like, which can align film strip generated light without inclining a light irradiation part for irradiating light. The light irradiation device according to an embodiment of the present invention includes a light irradiation device for irradiating polarized light to a film tape, and a plurality of transport devices provided before and after an irradiation position of the polarized light to the film tape, for transporting the film tape, wherein a position of each of the plurality of transport devices with respect to an irradiation direction of the polarized light can be changed.
Description
Technical Field
The present invention relates to a light irradiation device, and more particularly, to a light irradiation device and a light irradiation method for irradiating polarized light.
Background
In recent years, a technique of performing photo-alignment by irradiating polarized light through a film band of an alignment film or the like of a liquid crystal panel has been developed. For example, patent document 1 discloses that the illumination device includes an illumination unit for illuminating polarized light, and that: and a polarized light irradiation device for irradiating the film belt with the polarized light irradiated from the irradiation part. Then, the polarized light beam irradiation device described in patent document 1 changes the irradiation angle (incidence angle) of the polarized light beam with respect to the film strip by tilting the irradiation unit so that the film strip is aligned in a desired direction.
Prior art documents
Patent document
Patent document 1: japanese patent laid-open publication No. 2006-133498
Disclosure of Invention
Problems to be solved by the invention
However, in order to change the irradiation angle (incident angle) of the polarized light with respect to the film tape, when the polarized light irradiation device described in patent document 1 needs to tilt the irradiation portion, a structure capable of tilting the irradiation portion becomes necessary, and thus there is a problem that the structure of the polarized light irradiation device becomes complicated.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a light irradiation apparatus and a light irradiation method that can produce alignment of a film tape in a desired direction without tilting a light irradiation section.
Means for solving the problems
In one aspect of the present invention, the light irradiation device includes a light irradiation device for irradiating polarized light to the film tape, and a plurality of transport devices provided before and after an irradiation position of the polarized light to the film tape, for transporting the film tape, wherein a position of each of the transport devices of the plurality of transport devices with respect to an irradiation direction of the polarized light can be changed.
In the light irradiation device according to one aspect of the present invention, each of the plurality of transport devices may adjust an incident angle of the polarized light beam irradiated to the film tape by changing a position of an irradiation direction of the polarized light beam.
In the light irradiation device according to one aspect of the present invention, among the plurality of transport devices, displacement amounts with respect to the irradiation direction of the polarized light may be the same between a first transport device disposed before an irradiation position of the polarized light with respect to the film tape and a second transport device disposed after the irradiation position.
In the light irradiation device according to one aspect of the present invention, the first transport device and the second transport device are displaced in directions different from each other with respect to the irradiation direction of the polarized light.
In the light irradiation device according to one aspect of the present invention, the light irradiation device irradiates the film tape with linearly polarized light and is rotatable about an axis orthogonal to the film tape.
In one aspect of the present invention, a light irradiation method includes a light irradiation step of irradiating a film tape with polarized light, and a transport step of transporting the film tape by a plurality of transport devices which are provided before and after an irradiation position of the polarized light with respect to the film tape and whose positions with respect to an irradiation direction of the polarized light are changeable.
ADVANTAGEOUS EFFECTS OF INVENTION
The present invention can provide a light irradiation apparatus and a light irradiation method capable of aligning film strips with light without tilting a light irradiation section to which light is irradiated.
Drawings
Fig. 1 is an figure shape showing a composition example of the light irradiation device 10.
Fig. 2 is an figure-shape showing the outline of the positional relationship of the respective components of the light irradiation device 10.
Fig. 3 is an figure-shape showing another outline of the positional relationship of the components of the light irradiation device 10.
Fig. 4 is an figure-shape showing another outline of the positional relationship of the components of the light irradiation device 10.
Fig. 5 is a flowchart showing an example of the operation of the light irradiation device 10.
Detailed description of the invention
The embodiments of the present invention will be specifically described below with reference to the attached drawings.
< one embodiment >
Fig. 1 shows an figure-shape showing a configuration example of a light irradiation device 10 according to an embodiment of the present invention.
The light irradiation device 10 is a device that irradiates an exposed surface of a substrate or the like with polarized light obtained by transmitting light from a light source by a predetermined method, for example, to generate a film tape of an alignment film or the like for a liquid crystal panel. In order to increase the use rate of the dummy area, the light irradiation device 10 may be an MMG (multi mode glass) type exposure device in which a plurality of units having various sizes are arranged in plurality on a substrate or the like. In addition, the light irradiated to the film strip is not necessarily polarized light, and any light may be used.
In one embodiment of the present invention, by tilting a film tape of an alignment film or the like for a liquid crystal panel, the light irradiation device 10 can perform a desired photo-alignment process on the film tape. Specifically, the light irradiation device 10 changes the incident angle of the polarized light with respect to the film strip by tilting the film strip, thereby aligning the film strip in a desired direction.
The light irradiation device 10 includes a light irradiation section 11, a holder 12 for holding the light irradiation section 11, and a transport roller 13 for transporting a film tape 20. Further, the light irradiation section 11 may also be referred to as a light irradiation device 11. The transport roller 13 may be referred to as a transport device 13.
The light irradiation section 11 includes, for example, the polarization of a rod-shaped lamp such as a high-pressure mercury lamp or a metal halide lamp, or a wire grid polarizer, and can irradiate linearly polarized light to the film tape 20. The longitudinal direction of the light irradiation section 11 is a direction arranged substantially orthogonal to the conveyance direction of the film tape 20, and linearly polarized light can be irradiated in the width direction of the film tape 20.
Further, the light irradiation unit 11 may be rotated with respect to the transport direction of the film tape 20, and the polarization axis of the polarized light irradiated to the film tape 20 may be changed. The alignment direction of the film tape 20 is a direction depending on the polarizing axis of the polarized light irradiated to the film tape 20. Next, the alignment direction in which the film tape 20 is formed is appropriately set depending on the type, property, and application of the film tape, the type of liquid crystal panel of a product using the film tape 20, and the like. For example, the alignment direction of the film tape 20 may be a direction orthogonal to the conveyance direction of the film tape 20, or may be a direction that is at a predetermined angle (for example, 45 degrees or the like) with respect to the conveyance direction. Here, the light irradiation section 11 changes the polarization axis of the polarized light irradiated to the film tape 20 by rotating with respect to the transport direction based on the alignment direction of the film tape 20.
The light irradiation unit 11 is not necessarily a rod-shaped lamp as a linear light source, and may be a linear light source by linearly arranging a plurality of LEDs or LDs emitting ultraviolet light. The wavelength of the polarized light irradiated by the light irradiation section 11 may be arbitrarily set, for example, 313(nm) depending on the type, property, and use of the transparent film tape. In addition, the wavelength of the polarized light is not limited to this example, and any wavelength such as any wavelength between 285 and 320(nm) or the like may be used. In addition, the wavelength of the polarized light is not limited to the wavelength between 285 and 320(nm), and any wavelength may be used.
The wire grid polarizer is a polarizer in which a plurality of linear electric conductors (e.g., wires of chromium, aluminum, or the like) are arranged in parallel on a substrate of quartz glass or the like. Further, a polarizing member formed of a dielectric multilayer film on a quartz substrate may be used as a substitute for the wire grid polarizer. The wire grid polarizer reflects polarized wave (polarized light) components parallel to the longitudinal direction of the electric conductor from among the light irradiated from the rod-shaped lamp, and passes orthogonal polarized wave (polarized light) components. Therefore, the light irradiation section 11 can irradiate polarized light.
The light irradiation unit 11 may include a specific wavelength transmission filter. The specific wavelength transmission filter is a filter which only allows light of a specific wavelength range to pass through and absorbs light of other wavelengths. The specific wavelength transmission filter is a filter in which a filter layer such as a band pass filter, a low cut filter, or a reflection filter, which allows only light in a specific wavelength range to pass therethrough, is formed on a transparent substrate made of flat glass (quartz glass or the like).
The holder 12 supports the light irradiation section 11 so that the light irradiation section 11 can be positioned at a predetermined height from the film tape 20. As shown in fig. 1, the light irradiation section 11 is supported by two supports 12, and the film tape 20 is carried between the two supports 12. The height of the holder 12 can be arbitrarily set, and the distance between the light irradiation section 11 and the film tape 20 can be set to a desired distance according to the kind or the property of the film tape 20 to be subjected to the photo-alignment treatment. In the following example, a case where the distance between the light irradiation section 11 and the film tape 20 is fixed to a predetermined distance will be described as an example.
The film tape 20 is a film tape 20 already provided with an alignment film or an alignment layer for performing alignment by transmitting polarized light, and may be referred to as a photo-alignment film, for example. The film tape 20 may also be, for example, a viewing angle compensation film tape or the like. The film tape 20 is long, and is transported by being emitted from an emission roller (not shown), transported to a position below the light irradiation section 20, and wound back to a winding roller (not shown), for example. Next, when the film tape 20 is conveyed below the light irradiation unit 11, the film tape is irradiated with the polarized light from the light irradiation unit 11. Further, the film tape 20 may be bent during transportation. Here, a detection sensor capable of detecting the bending of the film tape 20 may be provided, and the speed of the unwinding from the unwinding roller or the rewinding speed of the rewinding roller may be adjusted based on the detection result of the detection sensor. Thereby, the bending of the film tape 20 can be prevented. Further, although the length of the film tape 20 in the width direction is, for example, 1490(mm), the length is not limited to this, and any length may be used.
The transport roller 13 is rotatable in the transport direction of the film tape 20, and can transport the film tape 20. As shown in fig. 1, before and after the polarized light is irradiated by the transmitted light irradiation section 11, the transport rollers 13 (transport roller 13A and transport roller 13B) are provided.
In one embodiment of the present invention, the transmitted polarized light may be incident on the film tape 20 at a predetermined angle, and a predetermined characteristic may be imparted to the film tape. Here, the light irradiation device 10 according to one embodiment of the present invention is configured to change the incident angle of the polarized light beam with respect to the film tape 20 by changing the positions of the transport roller 13A and the transport roller 13B provided before and after the polarized light beam is irradiated, and tilting the film tape with respect to the irradiation direction of the polarized light beam. Further, the positions of the transport rollers 13A and 13B with respect to the irradiation direction of the polarized light beam irradiated from the light irradiation unit 11 may be changed.
Fig. 2 is an figure-shape showing the outline of the positional relationship of the respective components of the light irradiation device 10. Fig. 2 shows an example of a case where the film tape 20 is horizontal because the positions of the transport rollers 13A and 13B are the same in the irradiation direction of the polarized light, and therefore the film tape is not inclined with respect to the vertical direction of the irradiation direction of the polarized light. As shown in fig. 2, since the positions of the transport roller 13A and the transport roller 13B are the same with respect to the irradiation direction of the polarized light, the polarized light is perpendicularly incident on the film tape 20.
In contrast, fig. 3 is an figure-shape showing another outline of the positional relationship of the respective components of the light irradiation device 10. Fig. 3 shows an example of a case where the film tape 20 is inclined with respect to the direction perpendicular to the irradiation direction of the polarized light because the positions of the transport roller 13A and the transport roller 13B are different from each other in the irradiation direction of the polarized light. As shown in fig. 3, the transport rollers 13A and 13B are displaced in directions different from each other with respect to the irradiation direction of the polarized light. Specifically, the transport roller 13A is displaced in the direction of irradiation of the polarized light, and the transport roller 13B is displaced in the direction opposite to the direction of irradiation of the polarized light.
As shown in fig. 3, the position of the transport roller 13A is higher than the position of the transport roller 13B by H in the irradiation direction of the polarized light. Therefore, the film tape 20 is inclined by a predetermined angle a with respect to the direction perpendicular to the irradiation direction of the polarized light. As a result, the incident angle of the polarized light irradiated from the light irradiation unit 11 with respect to the film tape 20 also becomes the predetermined angle a. Therefore, the light irradiation device 10 can give the film tape 20 a predetermined characteristic by transmitting the polarized light beam having the predetermined angle a to the film tape 20.
As shown in fig. 3, the amounts of positional deviation (H/2) of the respective rollers of the transport roller 13A and the transport roller 13B with respect to the irradiation direction of the polarized light are the same. Therefore, the distance between the light irradiation section 11 and the film tape 20 is the same as that in the case of fig. 2. In this way, by making the amount of positional deviation of the transport rollers 13A and 13B with respect to the irradiation direction of the polarized light equal, the irradiation point (irradiation position) of the polarized light with respect to the film tape 20 can be always made to be the same position.
The amounts of positional deviation of the transport rollers 13A and 13B with respect to the direction of irradiation of the polarized light are not necessarily the same, and may be different. In this case, the irradiation point (irradiation position) of the polarized light to the film tape 20 will be different depending on the amount of positional deviation.
The amount of positional deviation of the transport rollers 13A and 13B with respect to the irradiation direction of the polarized light is not limited to H shown in fig. 3, and may be arbitrarily set based on the predetermined characteristics given to the film tape 20 or the properties or characteristics of the film tape 20 itself. The incident angle of the polarized light to the film tape 20 can be changed by changing the amount of positional deviation of the transport rollers 13A and 13B with respect to the irradiation direction of the polarized light. The amount of positional deviation of the transport rollers 13A and 13B with respect to the irradiation direction of the polarized light may be determined based on a predetermined angle a of the incident angle of the polarized light based on the predetermined characteristic given to the film tape 20, and then the amount of positional deviation may be determined based on the predetermined angle a.
In addition, unlike the example of fig. 3, the following may be used: in the irradiation direction of the polarized light, the position of the transport roller 13B is higher than the position of the transport roller 13A by H. Fig. 4 is an figure-shape showing another outline of the positional relationship of the components of the light irradiation device 10. As shown in fig. 4, in the case where the position of the transport roller 13B is higher than the position H of the transport roller 13A in the irradiation direction of the polarized light, the film tape 20 is also inclined by a predetermined angle a with respect to the perpendicular direction to the irradiation direction of the polarized light. As a result, the incident angle of the polarized light irradiated from the light irradiation unit 11 with respect to the film tape 20 becomes the same predetermined angle a as in the case of fig. 3.
Fig. 5 is a flowchart showing an example of the operation of the light irradiation device 10.
As shown in fig. 5, the light irradiation section 11 of the light irradiation device 10 irradiates polarized light to the film tape 20 (S101). The light irradiation unit 11 irradiates polarized light at a predetermined period. The light irradiation unit 11 may continuously irradiate polarized light.
After the irradiation of the polarized light, the film tape 20 is conveyed by passing through the conveying rollers 13A and 13B provided before and after the irradiation position of the polarized light of the film tape 20 (S102). Further, each of the transport rollers 13A and 13B, and further, the position of the transport rollers 13A and 13B with respect to the irradiation direction of the polarized light can be changed. Further, the film tape 20 may be continuously conveyed by continuously rotating the conveying rollers 13A and 13B.
As described above, in one embodiment of the present invention, the light irradiation device 10 can change the incident angle of the polarized light beam with respect to the film tape 20 by tilting the irradiation angle of the polarized light beam with respect to the film tape 20 such as the alignment film of the liquid crystal panel, thereby aligning the film tape 20 in a desired direction. As a result, the film tape can be given specified characteristics.
In the above description, when the contents such as "perpendicular", "parallel", "planar", and "orthogonal" appear, the respective descriptions thereof do not have strict meanings. That is, the terms "perpendicular", "parallel", "planar" and "orthogonal" mean: in the case where tolerances or errors are allowable in design or manufacturing, the terms "substantially vertical", "substantially parallel", "substantially planar", and "substantially orthogonal" mean. Further, the tolerance or error described herein refers to: the unit means without departing from the structure, action, and effect of the present invention.
In the above description, when the dimensions and sizes of the outer shapes are described as "identical", "equal", and "different", the respective descriptions thereof do not have strict meanings. That is, the terms "identical", "equal" and "different" mean: in the case where tolerances or errors are allowable in design or manufacturing, the terms "substantially the same", "substantially equal" and "substantially different" mean "substantially the same". Further, the tolerance or error described herein refers to: the unit means without departing from the structure, action, and effect of the present invention.
Although the invention is described herein based on various figures or embodiments, those skilled in the art should note that: various modifications and alterations are readily possible in light of this disclosure. Therefore, it is to be noted that such variations and modifications are included in the scope of the present invention. For example, functions included in each device, each step, and the like may be rearranged in a logically non-contradictory manner, a plurality of devices, steps, and the like may be combined into one, or divided. Further, the structures shown in the above embodiments can be combined as appropriate.
Description of the reference numerals
10: light irradiation device
11: light irradiation section
12: support frame
13: transport drum
20: film tape (light alignment film)
Claims (6)
1. A light irradiation device, comprising:
a light irradiation device for irradiating the film tape with polarized light; and
a plurality of conveying devices arranged in front of and behind the irradiation position of the polarized light to the film belt for conveying the film belt, wherein
The position of each of the plurality of transport devices with respect to the irradiation direction of the polarized light is variable.
2. The light irradiation apparatus according to claim 1,
each of the plurality of transport devices can adjust an incident angle of the polarized light beam irradiated to the film tape by changing a position of an irradiation direction of the polarized light beam.
3. The light irradiation apparatus according to claim 1 or 2,
among the plurality of transport devices, the displacement amounts with respect to the irradiation direction of the polarized light of a first transport device disposed before the irradiation position of the polarized light to the film tape and a second transport device disposed after the irradiation position are the same as each other.
4. The light irradiation apparatus according to claim 3,
the first and second transport devices are displaced in directions different from each other with respect to the irradiation direction of the polarized light.
5. The light irradiation apparatus according to any one of claims 1 to 4,
the light irradiation device irradiates the film tape with linearly polarized light and is rotatable about an axis orthogonal to the film tape.
6. A method of irradiating light, comprising the steps of:
a light irradiation step of irradiating the film tape with polarized light; and
and a conveying step of conveying the film tape by a plurality of conveying devices which are arranged in front of and behind an irradiation position of the polarized light to the film tape and whose positions with respect to an irradiation direction of the polarized light are variable.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017250203A JP2019117235A (en) | 2017-12-26 | 2017-12-26 | Light irradiation device and light irradiation method |
| JP2017-250203 | 2017-12-26 | ||
| PCT/JP2018/041568 WO2019130851A1 (en) | 2017-12-26 | 2018-11-08 | Optical irradiation device and optical irradiation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111164502A true CN111164502A (en) | 2020-05-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201880063181.9A Pending CN111164502A (en) | 2017-12-26 | 2018-11-08 | Light irradiation device and light irradiation method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2019117235A (en) |
| CN (1) | CN111164502A (en) |
| WO (1) | WO2019130851A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3603758B2 (en) * | 2000-07-12 | 2004-12-22 | ウシオ電機株式会社 | Polarizing element of polarized light irradiation device for photo-alignment of liquid crystal alignment film |
| JP4626039B2 (en) * | 2000-09-26 | 2011-02-02 | コニカミノルタホールディングス株式会社 | Method for producing photo-alignment layer |
| US20080083998A1 (en) * | 2006-10-06 | 2008-04-10 | 3M Innovative Properties Company | Multiple draw gap length orientation process |
| JP5298593B2 (en) * | 2008-03-26 | 2013-09-25 | 大日本印刷株式会社 | Pattern forming device |
| JP2009276652A (en) * | 2008-05-16 | 2009-11-26 | Lintec Corp | Light irradiation method, method for producing optical film, and light irradiation device |
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2017
- 2017-12-26 JP JP2017250203A patent/JP2019117235A/en active Pending
-
2018
- 2018-11-08 WO PCT/JP2018/041568 patent/WO2019130851A1/en active Application Filing
- 2018-11-08 CN CN201880063181.9A patent/CN111164502A/en active Pending
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| Publication number | Publication date |
|---|---|
| JP2019117235A (en) | 2019-07-18 |
| WO2019130851A1 (en) | 2019-07-04 |
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Application publication date: 20200515 |