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JP6609350B2 - Imaging device using optical filter, head-up display, and optical filter manufacturing method - Google Patents
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JP6609350B2 - Imaging device using optical filter, head-up display, and optical filter manufacturing method - Google Patents

Imaging device using optical filter, head-up display, and optical filter manufacturing method Download PDF

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JP6609350B2
JP6609350B2 JP2018112509A JP2018112509A JP6609350B2 JP 6609350 B2 JP6609350 B2 JP 6609350B2 JP 2018112509 A JP2018112509 A JP 2018112509A JP 2018112509 A JP2018112509 A JP 2018112509A JP 6609350 B2 JP6609350 B2 JP 6609350B2
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optical filter
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display
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JP2018159943A (en
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義孝 武市
理之 山本
孝一 小林
政史 金田
孝之 川島
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Polatechno Co Ltd
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Description

本発明は、光学フィルタを使用した撮像装置及びヘッドアップディスプレイ並びに光学フィルタの製造方法に関する。   The present invention relates to an imaging device, a head-up display, and an optical filter manufacturing method using an optical filter.

光電変換素子を用いた撮像装置及び画像形成装置において、光学系へ入射する光の反射を防止するため等に偏光フィルタ等の光学フィルタを用いる技術が知られている。光学フィルタを用いることによって、反射を抑制し、画像を鮮明に撮像することが可能となる。   In an imaging apparatus and an image forming apparatus using a photoelectric conversion element, a technique using an optical filter such as a polarizing filter is known to prevent reflection of light incident on an optical system. By using the optical filter, it is possible to suppress reflection and capture an image clearly.

ところで、光学フィルタを撮像装置や画像形成装置の光の入射側に配置して用いた場合、光学フィルタの透過波面収差(PV値)が大きいと透過した光の像に歪みが生じ、撮像される画像の歪みも大きくなる問題がある。   By the way, when the optical filter is arranged and used on the light incident side of the imaging device or the image forming device, if the transmitted wavefront aberration (PV value) of the optical filter is large, the transmitted light image is distorted and captured. There is a problem that image distortion also increases.

そこで、本発明は、透過波面収差が小さく、透過した光の像の歪みを小さくした光学フィルタを使用した撮像装置及びヘッドアップディスプレイ並びに光学フィルタの製造方法を提供することを目的とする。   Therefore, an object of the present invention is to provide an imaging device, a head-up display, and an optical filter manufacturing method using an optical filter with small transmitted wavefront aberration and reduced distortion of an image of transmitted light.

本発明の1つの態様は、偏光層と基材との積層体を含む光学フィルタであって、前記基材の前記偏光層と積層された面と反対の面に粘着層を有し、透過波面収差(PV値)が0.4μm未満であることを特徴とする光学フィルタを備えた撮像装置である。   One aspect of the present invention is an optical filter including a laminate of a polarizing layer and a base material, the adhesive filter layer having a pressure-sensitive adhesive layer on a surface opposite to the surface laminated with the polarizing layer, and a transmitted wavefront It is an imaging device provided with an optical filter characterized by an aberration (PV value) of less than 0.4 μm.

本発明の別の態様は、偏光層と基材との積層体を含む光学フィルタであって、前記基材の前記偏光層と積層された面と反対の面に粘着層を有し、透過波面収差(PV値)が0.4μm未満であることを特徴とする光学フィルタを備えたヘッドアップディスプレイである。   Another aspect of the present invention is an optical filter including a laminate of a polarizing layer and a base material, the adhesive filter layer having a pressure-sensitive adhesive layer on a surface opposite to the surface laminated with the polarizing layer, and a transmitted wavefront A head-up display including an optical filter characterized in that aberration (PV value) is less than 0.4 μm.

本発明の別の態様は、偏光層と基材との積層体を含む光学フィルタであって、前記基材の前記偏光層と積層された面と反対の面に粘着層を有し、透過波面収差(PV値)が0.4μm未満である光学フィルタの製造方法であって、粘着剤の固形成分に対して5倍以下の溶剤で希釈した粘着剤を塗布した後、乾燥させることによって前記粘着層を形成することを特徴とする光学フィルタの製造方法である。   Another aspect of the present invention is an optical filter including a laminate of a polarizing layer and a base material, the adhesive filter layer having a pressure-sensitive adhesive layer on a surface opposite to the surface laminated with the polarizing layer, and a transmitted wavefront A method for producing an optical filter having an aberration (PV value) of less than 0.4 μm, wherein the pressure-sensitive adhesive is applied by applying a pressure-sensitive adhesive diluted with a solvent not more than 5 times the solid component of the pressure-sensitive adhesive and then drying the pressure-sensitive adhesive. It is a manufacturing method of the optical filter characterized by forming a layer.

本発明によれば、光学フィルタの透過波面収差を小さくし、像の歪みを抑制することができる。   According to the present invention, it is possible to reduce the transmitted wavefront aberration of the optical filter and suppress image distortion.

本発明の実施の形態における光学フィルタの構成を示す模式断面図である。It is a schematic cross section which shows the structure of the optical filter in embodiment of this invention.

本発明の実施の形態における光学フィルタ100は、第1基材10、偏光層12、第2基材14及び粘着層16を積層した構成とされる。なお、本実施の形態では光学フィルタ100として偏光フィルタを例に説明するが、本発明の適用範囲はこれに限定されるものではない。   The optical filter 100 in the embodiment of the present invention has a configuration in which a first base material 10, a polarizing layer 12, a second base material 14, and an adhesive layer 16 are laminated. In the present embodiment, a polarizing filter is described as an example of the optical filter 100, but the scope of application of the present invention is not limited to this.

第1基材10は、光学フィルタ100の保護層となる部材である。第1基材10は、任意に選択することができるが、例えばトリアセチルセルロース(TAC)フィルム、アクリルフィルム、環状オレフィン系フィルム等を用いることが好適である。一例として、TacBright社製P960GL等を適用することができる。第1基材10の厚さは、これに限定されるものではないが、20μm以上100μm以下とすることが好適である。   The first base material 10 is a member that becomes a protective layer of the optical filter 100. Although the 1st base material 10 can be selected arbitrarily, it is suitable to use a triacetyl cellulose (TAC) film, an acrylic film, a cyclic olefin system film etc., for example. As an example, P960GL manufactured by TacBright can be applied. Although the thickness of the 1st base material 10 is not limited to this, It is suitable to set it as 20 micrometers or more and 100 micrometers or less.

偏光層12は、特定の方向に偏光した光のみを透過する偏光子を含む層である。偏光層12は、任意に選択することができるが、例えばポリビニルアルコール(PVA)フィルムをヨウ素化合物等の二色性材料により染色し、延伸処理を行うことにより形成することができる。PVAフィルムは、一例として、クラレ製VF−PS#7500等を適用することができる。PVAフィルムは、例えば、延伸前において厚さ75μmのフィルムを延伸後において30μm程度となるまで延伸する。   The polarizing layer 12 is a layer including a polarizer that transmits only light polarized in a specific direction. Although the polarizing layer 12 can be selected arbitrarily, it can be formed by, for example, dyeing a polyvinyl alcohol (PVA) film with a dichroic material such as an iodine compound and performing a stretching treatment. As an example of the PVA film, Kuraray VF-PS # 7500 can be applied. The PVA film is stretched, for example, until a film having a thickness of 75 μm before stretching is about 30 μm after stretching.

第2基材14は、光学フィルタ100の保護層となる部材である。第2基材14は、任意に選択することができるが、例えばトリアセチルセルロース(TAC)フィルム、アクリルフィルム、環状オレフィン系フィルム等を用いることが好適である。一例として、TacBright社製P960GL等を適用することができる。第2基材14の厚さは、これに限定されるものではないが、20μm以上100μm以下とすることが好適である。   The second base material 14 is a member that becomes a protective layer of the optical filter 100. Although the 2nd base material 14 can be selected arbitrarily, it is suitable to use a triacetyl cellulose (TAC) film, an acrylic film, a cyclic olefin type film etc., for example. As an example, P960GL manufactured by TacBright, etc. can be applied. Although the thickness of the 2nd base material 14 is not limited to this, It is suitable to set it as 20 micrometers or more and 100 micrometers or less.

第1基材10及び第2基材14は、偏光層12に直接又は接着剤層を介して積層される。接着剤を用いる場合、水系の接着剤、すなわち接着剤成分を水に溶解又は分散させた接着剤を用いることが好適である。例えば、ポリビニルアルコール系樹脂、ウレタン樹脂等にイソシアネート系化合物、エポキシ化合物等を配合した接着剤成分を用いることが好適である。   The first base material 10 and the second base material 14 are laminated on the polarizing layer 12 directly or via an adhesive layer. When using an adhesive, it is preferable to use a water-based adhesive, that is, an adhesive in which an adhesive component is dissolved or dispersed in water. For example, it is preferable to use an adhesive component in which an isocyanate compound, an epoxy compound, or the like is blended with a polyvinyl alcohol resin, a urethane resin, or the like.

粘着層16は、光学フィルタ100を他の光学部品に貼り合わせるための設けられる層である。粘着層16は、第2基材14の偏光層12と積層された表面と反対側の裏面に形成される。粘着層16は、アクリル系の粘着剤を用いて形成することが好適である。   The adhesive layer 16 is a layer provided for attaching the optical filter 100 to another optical component. The adhesive layer 16 is formed on the back surface of the second substrate 14 opposite to the surface laminated with the polarizing layer 12. The adhesive layer 16 is preferably formed using an acrylic adhesive.

粘着層16は、アクリル系又はポリエステル系の粘着剤の固形成分をトルエンやメチルエチルケトン(MEK)等の溶剤で希釈した粘着材を第2基材14の裏面に塗布し、乾燥させることによって形成される。粘着剤は、アクリル系、ポリエステル系であれば特に限定されるものではなく、さらにこれら以外の粘着剤を使用してもよい。粘着層16の膜厚は、10μm以上50μm以下とすることが好適である。   The adhesive layer 16 is formed by applying and drying an adhesive material obtained by diluting a solid component of an acrylic or polyester adhesive with a solvent such as toluene or methyl ethyl ketone (MEK) and drying the adhesive. . The pressure-sensitive adhesive is not particularly limited as long as it is acrylic or polyester-based, and other pressure-sensitive adhesives may be used. The thickness of the adhesive layer 16 is preferably 10 μm or more and 50 μm or less.

ここで、溶剤による固形成分の希釈率は5倍以下とすることが好適である。通常、溶剤による接着剤の固形成分の希釈率は6〜8倍以上であるが、このように高い希釈率の接着材を用いた場合には、光学フィルタ100の透過波面収差(PV値)が大きくなり、また透過画像に筋状の濃淡が発生し易くなる。これに対して、溶剤による接着剤の固形成分の希釈率を5倍以下とした場合には、光学フィルタ100の透過波面収差(PV値)を小さくでき、また透過画像に生ずる筋状の濃淡を抑制できる。   Here, the dilution ratio of the solid component with the solvent is preferably 5 times or less. Usually, the dilution rate of the solid component of the adhesive with the solvent is 6 to 8 times or more. However, when the adhesive with such a high dilution rate is used, the transmitted wavefront aberration (PV value) of the optical filter 100 is low. It becomes large, and stripe-like shading is likely to occur in the transmission image. On the other hand, when the dilution ratio of the solid component of the adhesive with the solvent is set to 5 times or less, the transmission wavefront aberration (PV value) of the optical filter 100 can be reduced, and the streak density generated in the transmission image can be reduced. Can be suppressed.

例えば、アクリル系の粘着剤の固形成分をMEKで5倍に希釈した粘着材を第2基材14に塗布し、乾燥させたときの膜厚が23μmとなるように粘着層16を形成した光学フィルタ100では透過波面収差(PV値)は0.4μm未満であった。また、当該光学フィルタ100をカメラの前に設置する偏光フィルタとして使用したときに画像の歪みが改善された。また、当該光学フィルタ100を透過した画像に生ずる筋状の濃淡が低減された。   For example, an optical material in which a pressure-sensitive adhesive layer 16 is formed so that a film thickness of 23 μm when an adhesive material obtained by diluting a solid component of an acrylic pressure-sensitive adhesive with MEK is applied to the second substrate 14 and dried. In the filter 100, the transmitted wavefront aberration (PV value) was less than 0.4 μm. In addition, image distortion was improved when the optical filter 100 was used as a polarizing filter placed in front of the camera. In addition, streaky shading generated in the image transmitted through the optical filter 100 was reduced.

一方、アクリル系の粘着剤の固形成分をMEKで6〜8倍に希釈した粘着材を第2基材14に塗布し、乾燥させたときの膜厚が23μmとなるように粘着層16を形成した光学フィルタでは透過波面収差(PV値)は0.8μmであった。また、当該光学フィルタを偏光フィルタとして使用した場合、本実施の形態における光学フィルタ100に比べて画像の歪みが大きく、画像に生ずる筋状の濃淡が強く現れた。   On the other hand, an adhesive layer 16 is formed so that the adhesive layer obtained by diluting the solid component of the acrylic adhesive agent 6 to 8 times with MEK is applied to the second substrate 14 and dried to a film thickness of 23 μm. In the optical filter, the transmitted wavefront aberration (PV value) was 0.8 μm. Further, when the optical filter was used as a polarizing filter, the image distortion was larger than that of the optical filter 100 in the present embodiment, and the streak and darkness generated in the image appeared strongly.

以上のように、本実施の形態における光学フィルタ100によれば、透過波面収差を小さくすることができ、画像の歪みや筋状のノイズを低減することができる。したがって、光学フィルタ100をセンシングカメラに使用すれば、撮像された画像が鮮明になりセンシング精度を向上させることができる。また、液晶プロジェクタやヘッドアップディスプレイ(HUD)の防塵カバーに使用すれば、表示が鮮明になり、視認性を向上させることができる。   As described above, according to the optical filter 100 in the present embodiment, the transmitted wavefront aberration can be reduced, and image distortion and streak noise can be reduced. Therefore, if the optical filter 100 is used for the sensing camera, the captured image becomes clear and the sensing accuracy can be improved. Further, when used for a dustproof cover of a liquid crystal projector or a head-up display (HUD), the display becomes clear and the visibility can be improved.

10 第1基材、12 偏光層、14 第2基材、16 粘着層、100 光学フィルタ。   DESCRIPTION OF SYMBOLS 10 1st base material, 12 Polarizing layer, 14 2nd base material, 16 Adhesion layer, 100 Optical filter.

Claims (2)

偏光層と基材との積層体を含む光学フィルタであって、
前記基材の前記偏光層と積層された面と反対の面に粘着層を有し、
透過波面収差(PV値)が0.4μm未満であることを特徴とする光学フィルタを備えた撮像装置。
An optical filter including a laminate of a polarizing layer and a substrate,
Having an adhesive layer on the surface opposite to the surface laminated with the polarizing layer of the substrate;
An imaging apparatus provided with an optical filter, wherein a transmitted wavefront aberration (PV value) is less than 0.4 μm.
偏光層と基材との積層体を含む光学フィルタであって、
前記基材の前記偏光層と積層された面と反対の面に粘着層を有し、
透過波面収差(PV値)が0.4μm未満であることを特徴とする光学フィルタを備えたヘッドアップディスプレイ。
An optical filter including a laminate of a polarizing layer and a substrate,
Having an adhesive layer on the surface opposite to the surface laminated with the polarizing layer of the substrate;
A head-up display provided with an optical filter, wherein the transmitted wavefront aberration (PV value) is less than 0.4 μm.
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