CN100439973C - Optical low pass filter - Google Patents
Optical low pass filter Download PDFInfo
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- CN100439973C CN100439973C CNB2006101513537A CN200610151353A CN100439973C CN 100439973 C CN100439973 C CN 100439973C CN B2006101513537 A CNB2006101513537 A CN B2006101513537A CN 200610151353 A CN200610151353 A CN 200610151353A CN 100439973 C CN100439973 C CN 100439973C
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- retardation film
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Abstract
To provide an optical low pass filter capable of achieving excellent optical characteristic when it is assembled in optical equipment such as a video camera or a digital still camera without using a curable adhesive. The optical low pass filter 1 is formed by bonding crystal plates 2 and 3 and a flexible retardation film 4. An adhesion layer 5 in which average thickness of an individual body is 5 to 15[mu]m and thickness difference between the maximum thickness part and the minimum thickness part in the individual body is <=4[mu]m is installed on a bonded surface. When incident wavelength is defined as [lambda], transmitted wave aberration is +-1.5[lambda] or less.
Description
Technical field
The present invention relates to optical low-pass filter.
Background technology
In video camera and digital still camera (digital still camera) etc., be extensive use of solid-state imagers such as CCD or CMOS, carry out record so that will be converted to electric signal by the optical image that is subjected to the imaging of light microscopic head.These solid-state imagers have the regularly arranged structure of photodiode.Herein, the spatial frequency of optical image produces false signals such as ripple greater than by the sample frequency of this arrangement pitch decision the time.In order to prevent this false signal, at the optical low-pass filter of birefringent plate that has been subjected between light microscopic head and the solid-state imager configuration using.As optical low-pass filter, can use 2 divergence types, it utilizes single birefringent plate, or uses high performance 4 divergence types, and it is clamping polarizer or birefringent plate between 2 birefringent plates.
When constituting such optical low-pass filter, need with birefringent plate each other or birefringent plate and polarizer bubble-freely firmly paste.In the past, such stickup operation was undertaken by handwork, therefore operator's burden is big, and, because the difference of operator's skill level, cause the thickness of cement layer to produce deviation etc., the Products Quality instability can not be stablized the goods that provide good.
Therefore, proposed to realize the robotization of sticking operation, an amount of cement has been applied on the optical element, thereby made thickness certain technology (for example, patent documentation 1) of cement layer.And,, proposed to use the technology of cement and high melting-point wax (wax) as the technology that improves bond strength.
The real public clear 61-28181 communique of patent documentation 2 Japan
But the technology of patent documentation 1,2 all is to use the curing type cement, can not eliminate bubble sneak into and solidify before cement expose and produce problem such as bad order from engagement end portion.
Summary of the invention
, the objective of the invention is to herein, a kind of optical low-pass filter is provided, in its problem when eliminate using the curing type cement, when being assembled into optical device such as video camera or digital still camera, the performance excellent optical.
Optical low-pass filter of the present invention is pasted a plurality of optical elements each other and is formed, it is characterized in that, on described a plurality of optical elements stickup face each other, be provided with the bonding coat that constitutes by bonding agent, and the transmitted wave aberration is ± 1.5 λ following (λ is the incident light wavelength).
According to the present invention, therefore different because use bonding agent with the situation of using the curing type cement as the means that a plurality of optical elements are pasted each other, be difficult for producing bubble at bonding coat.And by using bonding agent, optical element can not misplace each other yet, can uniform cohesive be arranged to pasting mask, therefore, and the bond strength homogenising after the stickup.
And,, therefore, the unusual excellence of optical characteristics of the optical device of this optical low-pass filter has been installed because the transmitted wave aberration of optical low-pass filter be below ± 1.5 λ.This transmitted wave aberration is preferably ± below 1.2 λ, more preferably ± 1.0 below the λ.
In the present invention, described a plurality of optical element comprises quartz plate, described quartz plate stickup face each other is provided with bonding coat, and the intraindividual average thickness of preferred described bonding coat is 5 μ m～15 μ m, and the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is below the 4 μ m.
According to the present invention, the intraindividual average thickness that is arranged on the bonding coat on the quartz plate stickup face each other is 5 μ m～15 μ m, the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is below the 4 μ m, so can guarantee sufficient bond strength (bond strength), the distortion that brings quartz plate simultaneously is little, can stably remain on ± the following transmitted wave aberration of 1.5 λ.
Among the present invention, described a plurality of optical element comprises quartz plate and flexual phase retardation film, the stickup face of described quartz plate and described phase retardation film is provided with bonding coat, the intraindividual average thickness of preferred described bonding coat is 5 μ m～15 μ m, and the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is below the 4 μ m.
According to the present invention, phase retardation film has pliability, is very easy to carry out the stickup with quartz plate.And with the phase retardation film bending, after one end and quartz plate pasted, it is plane that phase retardation film is reverted to, and fully with the quartz plate stickup, thereby can prevent reliably that bubble from sneaking into bonding coat.And, owing to use phase retardation film, so can be with the optical low-pass filter lightweight.
And, the intraindividual average thickness of bonding coat is 5 μ m～15 μ m, the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is below the 4 μ m, therefore can fully guarantee bond strength, and, the distortion that brings phase retardation film and quartz plate is little, can stably keep ± the following transmitted wave aberration of 1.5 λ.
Among the present invention, the bounding force (with JIS Z 0237 is benchmark, peels off for 180 °) of preferred bonding coat is for more than the 10N/25mm.
According to the present invention, the bounding force of bonding coat is more than the 10N/25mm, so when being installed to optical low-pass filter on the goods or when carrying goods, can bring into play sufficient resistance to impact.More than the preferred 15N/25mm of this bounding force, more preferably more than the 20N/25mm.
Among the present invention, the roller test value (with JIS Z 0237 is benchmark, the J.Dow method) of preferred bonding coat is more than 2.
According to the present invention, the roller test value of bonding coat is more than 2, therefore, when optical element is pasted each other, can be difficult for producing dislocation.This roller test value is preferred more than 4.
Optical low-pass filter of the present invention is that a plurality of optical elements are pasted the optical low-pass filter that forms each other, it is characterized in that, on described a plurality of optical elements adhesive surface each other, be provided with the bonding coat that constitutes by bonding agent, and, in described bonding agent, be added with silane coupling agent.
According to the present invention, in described bonding agent, be added with silane coupling agent, so can improve the bounding force at the interface between described a plurality of optical element, can make the bonding coat attenuation.Its result can stably remain on the transmitted wave aberration of optical low-pass filter below the 1.5 μ m.
And,, then can improve the adaptation between described a plurality of optical element if in described bonding agent, add silane coupling agent.Its result can improve the moisture-proof and the solvent resistance of this optical low-pass filter.
Description of drawings
Fig. 1 is the perspective cross-sectional slice of configuration that the optical low-pass filter of embodiments of the present invention is shown.
Fig. 2 is the front elevation and the sectional view of first quartz plate of described embodiment.
Fig. 3 is the front elevation and the sectional view of second quartz plate of described embodiment.
Fig. 4 is the sectional view of the phase retardation film of described embodiment.
Fig. 5 is the process flow diagram of an example of manufacturing process of the optical low-pass filter of described embodiment.
Fig. 6 is that first of described embodiment is pasted the figure of operation.
Fig. 7 is that second of described embodiment is pasted the figure of operation.
Symbol description
1 optical low-pass filter; 2 first quartz plates; 3 second quartz plates; 4 phase retardation films; 5 bonding coats.
Embodiment
Below, with reference to accompanying drawing, describe embodiments of the present invention in detail.
[structure of optical low-pass filter]
Fig. 1 is the perspective cross-sectional slice of major part of digital still camera that the optical low-pass filter 1 of 4 divergence types that adopted present embodiment is shown.
Among Fig. 1, optical low-pass filter 1 is configured in and makes being subjected to light microscopic head 20 and the optical image of imaging being converted between the solid-state imager 21 that electric signal writes down of incident light imaging.
Being subjected to light microscopic head 20 can be a slice, also can be a plurality of lens group.And solid-state imager 21 can use for example CCD (charge-coupled image sensor), CMOS (complementary metal oxide semiconductor (CMOS)).
Solid-state imager 21 is configured in the bottom of matrix encapsulation 22, and this matrix encapsulation 22 is being subjected to light microscopic head 20 sides to have peristome.And, in order to prevent to adhere to dust, utilize cloche 23 to cover peristome at peristome.Herein, for the exposure of the solid-state imager 21 that prevents to cause because of the alpha ray isoradial, cloche 23 uses the special high purity glass that can not emit radioactive ray.
Optical low-pass filter 1 has first quartz plate 2 of solid-state imager 21 sides and is subjected to second quartz plate 3 of light microscopic head 20 sides and is clipped in flexual phase retardation film 4 between them.And, be respectively arranged with bonding coat 5 on the stickup face between quartz plate 2,3 and the phase retardation film 4.
Fig. 2 (A) illustrates from being subjected to the front elevation of first quartz plate 2 that light microscopic head 20 sides see, Fig. 2 (B) illustrates its sectional view.
On solid-state imager 21 sides that are subjected to light microscopic head 20 sides and first quartz plate 2 of second quartz plate 3, be respectively arranged with the antireflection film (not shown) of the transmitance that improves visible light herein.
In addition, substitute antireflection film, can also be provided with and prevent that infrared ray from inciding the infrared reflection film of solid-state imager 21.
Fig. 3 (A) illustrates from being subjected to the front elevation of second quartz plate 3 that light microscopic head 20 sides see, Fig. 3 (B) illustrates its sectional view.
In addition, these first quartz plates 2 are optical identical plates with second quartz plate 3, are that the center has rotated 90 degree with the axle perpendicular to quartz plate each other.In stickup operation described later, use the quartz plate of same structure, under the state that has rotated 90 degree mutually, paste.
As shown in Figure 4, as phase retardation film 4, used thickness is λ/4 plates of the uniaxial tension polycarbonate synthetic resin film of 0.12mm.Herein, phase retardation film 4 sticks on first quartz plate 2 and second quartz plate 3 and uses by the bonding coat 5 (intraindividual average thickness is respectively 5 μ m～15 μ m, and the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is that 4 μ m are following) that is arranged on the two sides.
And, though not shown, be pasted with diaphragm on the two sides of bonding coat 5, just before phase retardation film 4 was pasted quartz plate 2,3, this diaphragm had been stripped from.
Play the thermoplastic resin of synthetic resin film of the effect of λ/4 plates as formation, use the resin material that manifests after stretching as phase retardation film 4 desired phase differential 0.1 μ m～0.3 μ m.For example, can use cellulosic resin, polystyrene resins, vinyl chloride resin, polycarbonate resin, vinyl cyanide resin, polyolefin resin, polyether sulfone resin, polyaryl resinoid, polymethylmethacrylate resinoid.
Wherein, few, the permanance and transparent excellent of thermotolerance height, the water absorptivity of polycarbonate resin.And, having optically anisotropic compound by interpolation, can give along with the incident light wavelength increases and the wavelength dispersion characteristic of phase differential increase, can form high performance λ/4 plates.
Preferably, the wavelength dispersion characteristic of the phase differential of synthetic resin film makes phase differential increase and increase along with the incident light wavelength, specifically, and when the incident light wavelength is λ (μ m), in the scope of luminous ray (0.4 μ m～0.8 μ m), reach the phase differential of λ/4 ± 0.05 μ m.
Such optical low-pass filter 1 needs the transmitted wave aberration for below ± 1.5 λ.The transmitted wave aberration of optical low-pass filter 1 brings harmful effect for the optical characteristics of the optical device (digital still camera etc.) that this optical low-pass filter 1 is installed during greater than ± 1.5 λ.For example, the image quality aggravation after the shooting big (straight line or lattice shape microdeformation, line chap or attenuate).Therefore, preferably this transmitted wave aberration is below ± 1.2 λ, more preferably ± 1.0 below the λ.
In addition, for example, the high-precision laser interferometer formula form measuring instrument Verifire series that can use ZYGO company to make is measured plane-parallel homogeneity, measures optical thickness, thereby measures the transmitted wave aberration.
[bonding agent and bonding coat]
The following describes the optimal way of bonding agent that uses among the present invention and the bonding coat 5 that utilizes this bonding agent to constitute.
(kind of bonding agent)
As bonding agent, can use natural rubber class, synthetic rubber class, vinyl acetate/vinyl chloride copolymer class, glymes, acrylic compounds (acryl), improved polyalkene class etc.Wherein, consider, preferably use the acrylic adhesives of major component as alkoxyalkyl acrylate from the transparency, cohesive, permanance aspect.
(bounding force)
Bounding force as bonding agent, if the loading that when considering the goods assembling the such optical element of optical low-pass filter is applied, the impact when goods are carried, the peel strength (is benchmark with JIS Z 0237) that is preferably based on 180 ° of disbonded tests is more than the 10N/25mm, more than the preferred especially 20N/25mm.
And the roller test value of spin (ball tack) test (with JIS Z 0237 is benchmark, the J.Dow method) needs the initial stage bounding force more than 2 at least, and is during stickup, in order to prevent optical element dislocation each other, preferred more than 4.
(transparency)
Bonding agent constitutes the light transmission face of optical element, therefore requires high transparent.Mist degree as optical low-pass filter 1 is preferably below 1.0, more preferably below 0.5, more preferably below 0.1.
In addition, owing to have the situation (for example, in the optical thin film to quartz enforcement mist degree rising reason being arranged also) that causes mist degree to rise because of other factors, so the transparency of bonding agent is high more good more.
Herein, mist degree is the full mist degree by being the method mensuration of benchmark with JIS K 7105.
(flatness)
The flatness of bonding coat 5 (rugosity/ripple on the bonding coat surface during to phase retardation film 4 coating adhesives) is bigger to the influence of the transmitted wave aberration of optical element.If flatness is poor, then the transmitted wave aberration of optical element increases, and for example, has adopted the optical property of the digital still camera of optical low-pass filter 1 to worsen.Therefore, the flatness of preferred bonding coat 5 as far as possible is good.
For example, utilize roll-coater (roll coater) on phase retardation film 4, during coating adhesive, preferably to use following method coating adhesive (solution).
(1) in binder solution, adds levelling agent, reduce surface tension.
(2) slowly carry out drying.
A) reduce coating speed
B) additional drying gradient
C) add high boiling solvent.
(3) viscosity of coating fluid is brought up to the degree that is coated with woven design that do not produce.
(4) improve the solid constituent (resin) of bonding agent and the intermiscibility of solvent.
(thickness of bonding coat)
But,, when using quartz plate 2,3 and phase retardation film 4, need to relax the thickness to a certain degree of the hot expansion (contraction) that causes as the optical element of present embodiment.
Therefore, the intraindividual average thickness of preferred bonding coat 5 is 5 μ m～15 μ m, the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is below the 4 μ m, more preferably average thickness is 5 μ m～12 μ m, the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is below the 4 μ m, further preferred average thickness is 5 μ m～10 μ m, and the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is below the 4 μ m.
(adjuvant)
Usually, if the bonding coat attenuation, then bond strength descends.On the other hand, if in bonding agent, add silane coupling agent, then can improve the bounding force at the interface of the bounding force at interface of quartz plate 2 and phase retardation film 4 and quartz plate 3 and phase retardation film 4.Therefore, by adding silane coupling agent, can make the bonding coat attenuation.
Its result, the transmitted wave aberration with optical low-pass filter 1 stably remains on below the 1.5 μ m easily.
And, if in bonding agent, add silane coupling agent, then can improve adaptation between quartz plate 2 and the phase retardation film 4 and the adaptation between quartz plate 3 and the phase retardation film 4.Its result can improve the moisture-proof and the solvent resistance of optical low-pass filter 1.
As silane coupling agent, there is for example γ-glycidoxypropyltrime,hoxysilane, β-(3, the 4-epoxycyclohexyl) ethyl trimethoxy silane, γ-methacryloxypropyl trimethoxy silane, γ-methacryloxypropyl triethoxysilane, γ-acryloxy propyl group methyl dimethoxysilane, vinyltriethoxysilane, vinyltriacetoxy silane, to trimethoxysilyl styrene, to triethoxysilyl styrene, to trimethoxysilyl-α-Jia Jibenyixi, to triethoxysilyl-α-Jia Jibenyixi, the 3-TSL 8330, the 3-aminopropyltriethoxywerene werene, N-2-aminoethyl-3-aminopropyl methyl dimethoxysilane, N-2-aminoethyl-3-TSL 8330, N-2-aminoethyl-3-aminopropyl triethoxysilane, N-phenyl-3-aminopropyl trimethoxysilane, N-phenyl-3-aminopropyltriethoxywerene werene, N-propyl group-3-TSL 8330, the amino butyl trimethoxy silane of 4-, decyl trimethoxy silane etc.These silane coupling agents can use separately, also can mix use more than two kinds.
[manufacture method of optical low-pass filter]
The following describes the manufacture method of optical low-pass filter 1.
(summary of manufacture method)
Fig. 5 is the process flow diagram of an example of manufacturing process that the optical low-pass filter 1 of present embodiment is shown.
As the manufacturing process of this optical low-pass filter 1, have to paste to have formed first quartz plate 2 of infrared cut coating and antireflection film and the situation of second quartz plate 3, also have the situation that after pasting, forms infrared cut coating and antireflection film.Use has formed first quartz plate 2 of infrared cut coating and antireflection film and second quartz plate 3 when pasting, on the single face of the exterior side separately of first quartz plate 2 and second quartz plate 3, carry out infrared cut coating film formation process and antireflection film film formation process (S101, S102) respectively.If the film forming infrared cut coating, then on birefringent plate, produce warpage sometimes, therefore, and preferably after pasting, film forming infrared cut coating and antireflection film.
In the present embodiment, on first quartz plate 2, paste first of phase retardation film 4 and paste operation (S103) afterwards, the phase retardation film 4 that carries out sticking on first quartz plate 2 pastes the stickup of second on second quartz plate 3 operation, makes the optical low-pass filter 1 usefulness motherboard (S104) of 3-tier architecture.Then, as required, carry out pressurized treatments operation (105), this pressurized treatments operation is to pressurize when optical low-pass filter 1 usefulness motherboard is heated, thereby makes stickup more firm.Then, as required, form the infrared cut coating film formation process of infrared cut coating and the antireflection film film formation process (S106, S107) that on the opposing party's of this motherboard face, forms antireflection film on a side's who carries out at optical low-pass filter 1 usefulness motherboard the face, motherboard is given the function of IR-cut, and, the additional function that reduces reflection, improves light penetration.At last, cut into the cutting action (S108) of required size, afterwards through checking operation, packaging process, finally as optical low-pass filter 1 shipment.
Herein, paste the method for on first quartz plate 2, pasting phase retardation film 4 in the operation as first, because first quartz plate 2 is hard, phase retardation film 4 has pliability, therefore, utilize roller phase retardation film 4 to be pasted on first quartz plate 2, thereby can in atmosphere, paste in the mode of extruding bubble.And,, also can in vacuum atmosphere, carry out first and paste operation though production efficiency can descend.
(structure of sticker)
Fig. 6 (A) is the side perspective view that the summary structure of the vacuum sticker 100 that can be used in the first stickup operation and the second stickup operation both sides is shown.
Fig. 6 (B) is the enlarged drawing of guiding device 130, and the vertical view of first quartz plate 2 when Fig. 6 (C) is stickup and the position overlapped of phase retardation film 4 relation, Fig. 6 (D) are to illustrate to utilize vacuum sticker 100 to carry out the side view of the state of pressing action.
Shown in Fig. 6 (A), this vacuum sticker 100 has vacuum chamber 110, utilizes vacuum pipe arrangement 111 to be connected with not shown vacuum plant, can vacuumize.Dispose downside force fit plate 121 on the bottom surface in vacuum chamber 110, this downside force fit plate 121 is that upper surface is processed to level and smooth level and smooth flat board.Downside force fit plate 121 to the first quartz plates 2 are big, and its size is when carrying first quartz plate 2, to support first quartz plate, 2 integral body, and have some more than needed around.Side disposes guiding device 130 at the both ends of downside force fit plate 121, and this guiding device 130 can run through the lifting up and down of downside force fit plate 121 ground.
Shown in the enlarged drawing of Fig. 6 (B), in this guiding device 130, lifter pin 131 is maintained on the downside force fit plate 121, and this lifter pin 131 can be in vertically lifting, and its upper end is provided with tinsel bends to guiding maintaining part 132 from the shape of L word shape to foreign side.This guiding maintaining part 132 can keep the limit, two ends of the minor face 2A of rectangular-shaped first quartz plate 2, and, from the position of the two sides of both sides restriction minor face 2A.Lifter pin 131 by elastomeric element 133 upward bullet push away, at ordinary times, guiding maintaining part 132 is separated upward from the upper surface of downside force fit plate 121.By on this guiding maintaining part 132, keeping first quartz plate 2, first quartz plate 2 can be remained in the air.By pushing lifter pin 131 vertically downward, the bullet thrust of opposing elastomeric element 133 descends lifter pin 131, makes first quartz plate of being supported by guiding maintaining part 132 2 drop to upper surface position contacting with downside force fit plate 121.As elastomeric element 133, except illustrated volute spring, can also enumerate elastic bodys such as springs such as leaf spring, fluid spring or rubber.
Shown in Fig. 6 (C), the width of phase retardation film 4 forms narrower slightly than the length of first quartz plate 2, and is also narrower slightly than the separating distance between the lifter pin 131 of both sides.Therefore, shown in Fig. 6 (B), phase retardation film 4 can be carried on the downside force fit plate 121 between the lifter pin 131.
Run through the upper wall ground configuration lifting shaft 141 of vacuum chamber 110, this lifting shaft 141 drives by not shown drive unit, and vertically lifting is fixed with upside force fit plate 142 in the lower end of lifting shaft 141.The lower surface of this upside force fit plate 142 is parallel with the upper surface of downside force fit plate 121, is processed to level and smooth.The shape of upside force fit plate 142 is roughly identical with downside force fit plate 121, forms shape, the size that can cover first quartz plate, 2 integral body.The driving of lifting shaft 141 is set at, and when upside force fit plate 142 is descended, can drop to the position that can pressurize with the upper surface butt of downside force fit plate 121.
Below, being described in detail in the manufacturing process of optical low-pass filter 1, the important first stickup operation and second is pasted operation.
(first pastes operation)
With reference to Fig. 6, illustrate and use vacuum sticker 100, under vacuum atmosphere, carry out the method for the first stickup operation.Phase retardation film 4 under this situation uses the film that is provided with the type of bonding coat 5 (having diaphragm) on the two sides.
Then, close the behind the door not shown of vacuum chamber 110, make not shown vacuum plant work, by vacuumizing in 111 pairs of vacuum chambers 110 of vacuum pipe arrangement.Reach after the predetermined vacuum level in the vacuum chamber 110, utilize not shown drive unit to drive lifting shaft 141, make its decline.Lifting shaft 141 descends, upside force fit plate 142 descends, upper end butt with guiding maintaining part 132, the bullet thrust of the elastomeric element 133 of top is pushed lifter pin 131 in opposing, upside force fit plate 142 descends when pushing guiding maintaining part 132 downwards, make after first quartz plate 2 that remains on the guiding maintaining part 132 and phase retardation film 4 butts that are carried on the downside force fit plate 121, utilize upside force fit plate 142 to push first quartz plate 2 with predetermined pressure.Thus, shown in Fig. 6 (D), between upside force fit plate 142 and downside force fit plate 121, clip first quartz plate 2 and phase retardation film 4, carry out pressing with predetermined pressure.First quartz plate 2 of this moment and phase retardation film 4 overlapping remain the configuration shown in Fig. 6 (C).After the pressing schedule time, drive not shown drive unit, lifting shaft 141 is risen, upside force fit plate 142 is risen.Follow the rising of upside force fit plate 142, guiding maintaining part 132 is pasted with in the bullet thrust support that utilizes elastomeric element 133 under the state of first quartz plate 2 of phase retardation film 4 and rises, and returns to original position.
Then, cut off the vacuum pipe arrangement 111 of vacuum chamber 110, in vacuum chamber 110, import atmosphere, return to atmospheric pressure, finish first bonding process.
(second pastes operation)
Then, with reference to Fig. 7, illustrate and use vacuum sticker 100 to carry out the method for the second stickup operation.Fig. 7 (A) is the overlapping vertical view of explanation first quartz plate 2, phase retardation film 4 and second quartz plate 3, and Fig. 7 (B) is arranged on the sectional view of the state on the vacuum sticker 100 (Fig. 6), and Fig. 7 (C) is the sectional view that stitching state is shown.
At first, open the not shown door of vacuum chamber 110 (Fig. 6), take out first quartz plate 2 be pasted with phase retardation film 4, shown in Fig. 7 (B), carrying second quartz plate 3 on the precalculated position of the upper surface of downside force fit plate 121.Peel off diaphragm from the opposing party's of phase retardation film 4 bonding coat 5, expose adhesive surface, the adhesive surface that will expose remains on first quartz plate 2 on the guiding maintaining part 132 of guiding device 130 down once more.Vertical direction overlapping shown in Fig. 7 (A) of first quartz plate 2, phase retardation film 4 and second quartz plate 3 of this moment, second quartz plate, 3 orthogonal configuration of first rectangular-shaped quartz plate 2 and identical rectangular shape, the width of the paper left and right directions of second quartz plate 3 is narrower than the width of the equidirectional of phase retardation film 4.Be carried on the downside force fit plate 121 second quartz plate 3 with remain in first quartz plate 2 of guiding on the maintaining part 132 on the phase retardation film 4 pasted separate, become arranged opposite.
Configuration status shown in Fig. 7 (B), by vacuumizing in 111 pairs of vacuum chambers 110 of vacuum pipe arrangement, reach after the predetermined vacuum level, drive not shown drive unit, lifting shaft 141 is descended, upside force fit plate 142 descends, upper end butt with guiding maintaining part 132, the bullet thrust of the elastomeric element 133 of top is pushed lifter pin 131 in opposing, upside force fit plate 142 descends when pushing guiding maintaining part 132 downwards, make after phase retardation film of pasting on first quartz plate 2 that remains on the guiding maintaining part 132 4 and second quartz plate, 3 butts that are carried on the downside force fit plate 121, utilize upside force fit plate 142 to push first quartz plate 2 with predetermined pressure.
Thus, shown in Fig. 7 (C), clip first quartz plate 2 and phase retardation film 4 and second quartz plate 3 between upside force fit plate 142 and downside force fit plate 121, the lifting shaft 141 of the driving force by transmitting not shown drive unit is pushed with predetermined pressure.
After the pressing schedule time, drive not shown drive unit, lifting shaft 141 is risen, upside force fit plate 142 is risen.Along with the rising of upside force fit plate 141, guiding maintaining part 132 is supported in the bullet thrust of utilizing elastomeric element 133 under the state of first quartz plate 2 that is pasted with second quartz plate 3 on the phase retardation film 4 and rises, and returns to original position.Then, close the vacuum pipe arrangement 111 of vacuum chamber 110, in vacuum chamber 110, import atmosphere, return to atmospheric pressure, open the not shown door of vacuum chamber 110, take out the plywood (optical low-pass filter 1 is used motherboard) of having pasted first quartz plate 2 and second quartz plate 3 on the two sides of phase retardation film 4.
According to above-mentioned embodiment, can bring into play following effect.
(1) use bonding agent as the means of pasting quartz plate 2,3 and phase retardation film 4, therefore different with the situation of using the curing type cement, be difficult on knitting layer, producing bubble.And, by using bonding agent, optical element is not misplaced each other, and make the stickup mask that uniform cohesive be arranged, therefore, the bond strength homogenising after the stickup.And coating adhesive on phase retardation film 4 in advance is so it is excessive and overflow outside optical low-pass filter 1 bonding agent can not occur.
(2) the transmitted wave aberration of optical low-pass filter 1 is the following lower values of ± 1.5 λ, and therefore, under situation about using in the optical devices such as digital still camera that this optical low-pass filter has been installed, optical characteristics is very excellent.
(3) in optical low-pass filter 1, the intraindividual average thickness that is arranged on the bonding coat on the stickup face of quartz plate and phase retardation film is 5 μ m～15 μ m, the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is the following scopes of 4 μ m, so can guarantee sufficient bond strength (bond strength), the distortion that brings quartz plate simultaneously is little, can stably keep ± the following transmitted wave aberration of 1.5 λ.And, if the thickness of bonding coat is thin like this, then easily the surface of bonding coat is smoothly processed, help transmitted wave aberration when constituting optical low-pass filter 1 stably to remain on ± below 1.5 λ.
(4) bonding coat 5 does not absorb the warpage of quartz plate 2,3, therefore can relax warpage.Its result, the transmitted wave aberration can be reduced to ± below 1.5 λ, and stabilization.
(5) phase retardation film 4 is made by synthetic resin, therefore can be with the quantification in light weight of optical low-pass filter 1.
(6) in vacuum atmosphere, first quartz plate 2 and second quartz plate 3 are sticked on the two sides of phase retardation film 4, therefore, can prevent from more reliably between phase retardation film 4 and quartz plate 2,3, to have bubble.
(7) if contain silane coupling agent in the bonding agent, then the adaptation between quartz plate 2,3 and the phase retardation film 4 is excellent more, moisture-proof and solvent resistance excellence.
(8) coating adhesive on phase retardation film 4 in advance covers with diaphragm, therefore, when pasting with quartz plate 2,3, need not matting, and sneaking into of dust, foreign matter is also few.
(9) utilize the bonding elasticity of bonding coat 5 to absorb the difference of the thermal expansivity of phase retardation film 4 and quartz plate (birefringent plate) 2,3, therefore, can guarantee the bond strength of so-called opposing thermal shock.
Disclose in the superincumbent narration and implemented preferred structure of the present invention, method etc., but the invention is not restricted to this.Promptly, the present invention mainly illustrates especially and describes specific embodiment, but in the scope that does not break away from technological thought of the present invention and purpose, those skilled in the art can carry out various distortion to above-described embodiment on shape, material, quantity, other detailed structure.
Therefore, the above-mentioned disclosed record that defines shape, material etc., it is the exemplary record of carrying out for the ease of understanding the present invention, be not to be used to limit the present invention, so the record in the title of the parts of part or all qualification of the qualification that has broken away from these shapes, material etc. is also included among the present invention.
For example, in the present embodiment, utilize quartz plate 2,3 and phase retardation film 4 to constitute optical low-pass filter 1, but can use 3 bauerite plates to constitute optical low-pass filter.
And, in the above description, first both sides that paste the operation and the second stickup operation all use vacuum sticker 100 to carry out, but in the present invention, first pastes operation can not finish under vacuum atmosphere, therefore, consider, preferably only paste operation and in vacuum atmosphere, carry out second from the aspect of production efficiency.
And, when utilizing bonding agent to paste, also can on upside force fit plate 142 and downside force fit plate 121, distinguish heating units (not shown) such as built-in electric heater.When pressing, utilize the heating unit heated adhesive, make bonding agent softening, make surface smoothing, thereby can reduce the transmitted wave aberration of resulting optical low-pass filter 1 more.
Claims (3)
1. optical low-pass filter, this wave filter is that a plurality of optical elements are pasted the optical low-pass filter that forms each other, it is characterized in that,
Described a plurality of optical element comprises quartz plate;
On described a plurality of optical elements stickup face each other, be provided with the bonding coat that constitutes by bonding agent, and be that the bounding force of the described bonding coat measured of benchmark is more than the 10N/25mm with JIS Z 0237;
The intraindividual average thickness of described bonding coat is 5 μ m～15 μ m, and the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is below the 4 μ m.
2. optical low-pass filter, this wave filter is that a plurality of optical elements are pasted the optical low-pass filter that forms each other, it is characterized in that,
Described a plurality of optical element comprises quartz plate;
On described a plurality of optical elements stickup face each other, be provided with the bonding coat that constitutes by bonding agent, and be that the roller test value of the described bonding coat measured of benchmark is more than 2 with JIS Z 0237;
The intraindividual average thickness of described bonding coat is 5 μ m～15 μ m, and the difference of intraindividual maximum ga(u)ge portion and minimum thickness portion is below the 4 μ m.
3. optical low-pass filter as claimed in claim 1 or 2 is characterized in that,
Described a plurality of optical element comprises quartz plate and flexual phase retardation film,
The stickup face of described quartz plate and described phase retardation film is provided with bonding coat.
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| JP2005260493 | 2005-09-08 | ||
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| CN100439973C true CN100439973C (en) | 2008-12-03 |
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| CN100451733C (en) * | 2007-04-20 | 2009-01-14 | 中国科学院上海光学精密机械研究所 | Laser beam space shaping device |
| TWI486632B (en) * | 2013-05-24 | 2015-06-01 | 鑫晶鑽科技股份有限公司 | Camera device and projector device having protective lens |
| CN114506089B (en) * | 2022-01-18 | 2024-01-05 | 北京智创芯源科技有限公司 | Preparation method of infrared multi-band optical filter |
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| CN1525195A (en) * | 2003-02-25 | 2004-09-01 | �ն��繤��ʽ���� | Optical element, its manufacturing method, adhesive optical element and image display |
| CN1542501A (en) * | 2003-05-02 | 2004-11-03 | 精工爱普生株式会社 | Manufacturing method of optical low pass filter |
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| CN1525195A (en) * | 2003-02-25 | 2004-09-01 | �ն��繤��ʽ���� | Optical element, its manufacturing method, adhesive optical element and image display |
| CN1542501A (en) * | 2003-05-02 | 2004-11-03 | 精工爱普生株式会社 | Manufacturing method of optical low pass filter |
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