JP6641009B2 - Laminated color filter, method of manufacturing laminated color filter, and optical sensor - Google Patents

Description

  The present invention relates to a laminated color filter, a kit, a method for manufacturing a laminated color filter, and an optical sensor having a laminated color filter, in which a filter having an absorption color filter and a filter having a reflection color filter are laminated. Color filter, kit, manufacturing method of multilayer color filter having a number of wavelength regions exceeding the sum of the number of wavelength region species and the number of wavelength region species of reflective color filter, and optical device having multilayer color filter Related to sensors.

At present, various types of optical sensors and image sensors using photodiodes are used. In order to obtain a color image with an optical sensor and an image sensor, color filters of three primary colors of R (Red), G (Green), and B (Blue) are generally used. The color filters are not limited to the three primary colors.
For example, Patent Document 1 includes a color filter that is used to reproduce blue formed on a photodiode that receives blue light among photodiodes in order to enhance color reproducibility, and reproduces red. At least one of the color filter used to perform the color filter or the color filter used to reproduce the green or the color filter used to reproduce the blue is a red filter, a green filter, a blue filter, a cyan filter, or a yellow filter. A solid-state imaging device formed by laminating at least two is described.
In Patent Document 1, a color filter used to reproduce red is formed by laminating a red filter and a first yellow filter, and a color filter used to reproduce green is composed of a second yellow filter and a first yellow filter. It is illustrated that a cyan filter is formed by stacking a second cyan filter and a blue filter, and a color filter used to reproduce blue is formed by stacking a second cyan filter and a blue filter.

  Further, in Patent Document 2, blue and green layers are superimposed on actual patterns of a single pixel blue filter B3, a green filter G3 and a red filter R3, and layer arrays (20) and (30) showing two subtractive primary color hue patterns. And a red filter array. The layer array (20) consists of two layers Y3 and M3, each containing a yellow dye and a magenta dye. The layer array (30) consists of two layers M4 and C5, each containing a cyan dye and a magenta dye. Layer Y3 is restricted to the area forming filters G3 and R3. Layer C5 is restricted to the area forming filters G3 and B3. Layer M3 is restricted to the area forming filter B3, while layer M4 is restricted to the area forming filter R3. Patent Document 2 describes a color filter array capable of accurately controlling the hue of a layer, that is, absorption and transmission profiles of a spectrum.

JP 2009-289768 A Japanese Patent No. 2664154

As described above, Patent Document 1 describes that color reproducibility is improved by using a plurality of filters, and Patent Document 2 describes that the hue of a layer is accurately controlled by using a plurality of filters. .
However, in the optical sensor including the above-described example, the purpose is to acquire RGB color information in accordance with human visibility, and not to acquire information in a specific wavelength range.

  An object of the present invention is to provide a multilayer color filter, a kit, a method for manufacturing a multilayer color filter, and an optical sensor for solving the above-described problems based on the related art and acquiring information in a specific wavelength range. It is in.

  In order to achieve the above object, the present invention has at least one absorption color filter and at least one reflection color filter, wherein the absorption color filter and the reflection color filter are laminated, Where m is the genus of the wavelength region of the reflective color filter, n is the genus of the wavelength region of the reflective color filter, and p is the genus of the wavelength region of the multilayer color filter, p> m ≧ 2, and An object of the present invention is to provide a laminated color filter, wherein p> n ≧ 2.

It is preferable that the reflection type color filter has circularly polarized light reflection characteristics.
Further, it is preferable that at least one reflective color filter having right circularly polarized light reflection characteristics and at least one reflective color filter having left circularly polarized light reflection characteristics are provided.
The reflection type color filter is preferably a polymerized cholesteric liquid crystal composition cured.
It is preferable that the polymerizable cholesteric liquid crystal composition contains at least one or more polymerizable liquid crystal compounds and at least one or more photoreactive chiral agents.
The photoreactive chiral agent is preferably represented by the following general formulas (1) to (5).

In the formula, A ₁₁ and A ₁₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₁₁ —, and Ar ₁₁ represents an aromatic carbon ring which may have a substituent or R ₁₁ and R ₁₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or an aromatic carbon ring which may have a substituent; Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₁₂ and R ₁₄ each independently represent a hydrogen atom or a C _{1 to} C ₁₂ of an alkyl _{group, B 11} and _{B 12} each independently -C is _{(= O) - (Ar 12} ) n 11 - , or _{-C (= O) -Ar 13 -N} = X 11 -Ar 14 - a represents , _{X 11} represents N or CH, _{Ar 12} Ar ₁₃ and Ar ₁₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₁₁ represents an integer of 0 to 2, When n ₁₁ is 2, a plurality of Ar ₁₂ may be the same or different, and Z ₁₁ and Z ₁₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₁₁ and Z ₁₂ may have a polymerizable group. Z ₁₁ and R ₁₂ and Z ₁₂ and R ₁₄ may form a ring with each other, and Z ₁₁ and Z ₁₂ of a plurality of molecules may be polymerized via a covalent bond.

In the formula, A ₂₁ and A ₂₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₂₁ —, and Ar ₂₁ represents an aromatic carbon ring which may have a substituent or Represents an aromatic heterocyclic ring which may have a substituent, wherein R ₂₁ and R ₂₃ each independently represent a hydrogen atom, an alkyl group of C _{1 to} C ₁₂ , or an aromatic carbon ring which may have a substituent Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₂₂ and R ₂₄ are each independently a hydrogen atom or a C _{1 to} C ₁₂ represents an alkyl _{group, B 21} and _{B 22} are each independently _{-C (= O) - (Ar} 22) n 21 - , or _{-C (= O) -Ar 23 -N} = X 21 -Ar 24 - a represents , _{X 21} represents N or CH, _{Ar 22} Ar ₂₃ and Ar ₂₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₂₁ represents an integer of 0 to 2, When n ₂₁ is 2, a plurality of Ar ₂₂ may be the same or different, and Z ₂₁ and Z ₂₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₂₁ and Z ₂₂ may have a polymerizable group. Z ₂₁ and R ₂₂ and Z ₂₂ and R ₂₄ may form a ring with each other, and a plurality of molecules of Z ₂₁ and Z ₂₂ may be polymerized via a covalent bond.

In the formula, A ₃₁ and A ₃₂ each independently represent a single bond, —OC (＝ O) — or —OC (＝ O) —Ar ₃₁ —, wherein Ar ₃₁ has a substituent. R ₃₁ and R ₃₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or a substituent. And an optionally substituted aromatic carbocycle, an optionally substituted aromatic heterocycle, a cyano group, or a C ₁ -C ₁₂ alkyloxycarbonyl group, wherein R ₃₂ and R ₃₄ each independently represent hydrogen. represents an alkyl group of atoms or _C 1 _{~C 12, B 31} and _{B 32} represents a single bond _{independently, -C (= O) - (} Ar 32) n 31 - , or -C (= O) _{-Ar 33} - N represents X ₃₁ —Ar ₃₄ —, and X ₃₁ represents N or Represents CH, Ar ₃₂ , Ar ₃₃ and Ar ₃₄ each independently represent an aromatic carbon ring which may have a substituent or an aromatic heterocyclic ring which may have a substituent, and n ₃₁ represents Represents an integer of 0 to 2, and when n ₃₁ is 2, a plurality of Ar ₃₂ may be the same or different; Z ₃₁ and Z ₃₂ each independently represent a hydrogen atom, an alkyl group of C _{1 to} C ₁₂ , alkoxy groups of ₁ -C _12, alkyl carbonyl group of C 1 _{-C 12,} alkyl amino group of C 1 _{-C 12,} or an alkyl amide group of the _C 1 ~C _{12, Z 31} and _{Z 32} are, It may have a polymerizable group, Z ₃₁ and R ₃₂ and Z ₃₂ and R ₃₄ may form a ring with each other, or a plurality of molecules of Z ₃₁ and Z ₃₂ may be polymerized via a covalent bond. Well, L is divalent It represents a group. The binaphthyl moiety has either (R) or (S) axial asymmetry.

In the formula, A ₄₁ and A ₄₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₄₁ —, and Ar ₄₁ represents an aromatic carbon ring which may have a substituent or Represents an aromatic heterocyclic ring which may have a substituent, wherein R ₄₁ and R ₄₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or an aromatic carbon ring which may have a substituent; Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₄₂ and R ₄₄ are each independently a hydrogen atom or a C _{1 to} C ₁₂ represents an alkyl _{group, B 41} and _{B 42} are each independently _{-C (= O) - (Ar} 42) n 41 - , or _{-C (= O) -Ar 43 -N} = X 41 -Ar 44 - a represents , _{X 41} represents N or CH, _{Ar 42} Ar ₄₃ and Ar ₄₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₄₁ represents an integer of 0 to 2, When n ₄₁ is 2, a plurality of Ar ₄₂ may be the same or different, and Z ₄₁ and Z ₄₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₄₁ and Z ₄₂ may have a polymerizable group. Z ₄₁ and R ₄₂ and Z ₄₂ and R ₄₄ may form a ring with each other, a plurality of molecules Z ₄₁ and Z ₄₂ may be polymerized through a covalent bond, and R ₄₅ and R ₄₆ C ₁ -C ₃₀ And may form a ring with each other. * Represents an asymmetric carbon.

Wherein, P ₅₁ represents a polymerizable group, Sp ₅₁ represents an alkylene group of a single bond or C ₁ ~ _12, plurality of carbon atoms may be replaced by an oxygen atom or a carbonyl group, X ₅₁ represents a single bond Or an oxygen atom; Ar ₅₁ and Ar ₅₂ each independently represent an aromatic carbon ring which may have a substituent or an aromatic heterocyclic ring which may have a substituent; and L ₅₁ is a single bond Or n represents a divalent linking group, n ₅₁ represents an integer of 1 to 3, and when n ₅₁ is 2 or more, a plurality of Ar ₅₁ and L ₅₁ may be the same or different from each other, and R ₅₂ is asymmetric. Represents a side chain containing carbon.

The polymerizable cholesteric liquid crystal composition preferably has a photo-alignment film in contact with a cured reflective color filter having right circularly polarized light reflection characteristics or a reflective color filter having left circularly polarized light reflection characteristics.
It is preferable that the refractive index anisotropy Δn of the polymerizable liquid crystal compound is 0.2 or more.
Further, it is preferable to have a near infrared cut layer that blocks a part or the whole of the near infrared region.

The present invention provides a polymerizable liquid crystal composition comprising at least one polymerizable liquid crystal compound, a photoreactive chiral agent having right-handed properties and a polymerization initiator, at least one polymerizable liquid crystal compound, and left-handed properties. A kit comprising a polymerizable liquid crystal composition containing a photoreactive chiral agent having the formula (I) and a polymerization initiator.
The photoreactive chiral agent having a right-handed property is represented by the following general formula (1) or (3), and the photoreactive chiral agent having a left-handed property is represented by the following general formula (2) or ( It is preferable to be represented by 3).

In the formula, A ₁₁ and A ₁₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₁₁ —, and Ar ₁₁ represents an aromatic carbon ring which may have a substituent or R ₁₁ and R ₁₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or an aromatic carbon ring which may have a substituent; Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₁₂ and R ₁₄ each independently represent a hydrogen atom or a C _{1 to} C ₁₂ of an alkyl _{group, B 11} and _{B 12} each independently -C is _{(= O) - (Ar 12} ) n 11 - , or _{-C (= O) -Ar 13 -N} = X 11 -Ar 14 - a represents , _{X 11} represents N or CH, _{Ar 12} Ar ₁₃ and Ar ₁₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₁₁ represents an integer of 0 to 2, When n ₁₁ is 2, a plurality of Ar ₁₂ may be the same or different, and Z ₁₁ and Z ₁₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₁₁ and Z ₁₂ may have a polymerizable group. Z ₁₁ and R ₁₂ and Z ₁₂ and R ₁₄ may form a ring with each other, and Z ₁₁ and Z ₁₂ of a plurality of molecules may be polymerized via a covalent bond.

In the formula, A ₂₁ and A ₂₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₂₁ —, and Ar ₂₁ represents an aromatic carbon ring which may have a substituent or Represents an aromatic heterocyclic ring which may have a substituent, wherein R ₂₁ and R ₂₃ each independently represent a hydrogen atom, an alkyl group of C _{1 to} C ₁₂ , or an aromatic carbon ring which may have a substituent Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₂₂ and R ₂₄ are each independently a hydrogen atom or a C _{1 to} C ₁₂ represents an alkyl _{group, B 21} and _{B 22} are each independently _{-C (= O) - (Ar} 22) n 21 - , or _{-C (= O) -Ar 23 -N} = X 21 -Ar 24 - a represents , _{X 21} represents N or CH, _{Ar 22} Ar ₂₃ and Ar ₂₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₂₁ represents an integer of 0 to 2, When n ₂₁ is 2, a plurality of Ar ₂₂ may be the same or different, and Z ₂₁ and Z ₂₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₂₁ and Z ₂₂ may have a polymerizable group. Z ₂₁ and R ₂₂ and Z ₂₂ and R ₂₄ may form a ring with each other, and a plurality of molecules of Z ₂₁ and Z ₂₂ may be polymerized via a covalent bond.

In the formula, A ₃₁ and A ₃₂ each independently represent a single bond, —OC (＝ O) — or —OC (＝ O) —Ar ₃₁ —, wherein Ar ₃₁ has a substituent. R ₃₁ and R ₃₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or a substituent. And an optionally substituted aromatic carbocycle, an optionally substituted aromatic heterocycle, a cyano group, or a C ₁ -C ₁₂ alkyloxycarbonyl group, wherein R ₃₂ and R ₃₄ each independently represent hydrogen. represents an alkyl group of atoms or _C 1 _{~C 12, B 31} and _{B 32} represents a single bond _{independently, -C (= O) - (} Ar 32) n 31 - , or -C (= O) _{-Ar 33} - N represents X ₃₁ —Ar ₃₄ —, and X ₃₁ represents N or Represents CH, Ar ₃₂ , Ar ₃₃ and Ar ₃₄ each independently represent an aromatic carbon ring which may have a substituent or an aromatic heterocyclic ring which may have a substituent, and n ₃₁ represents Represents an integer of 0 to 2, and when n ₃₁ is 2, a plurality of Ar ₃₂ may be the same or different; Z ₃₁ and Z ₃₂ each independently represent a hydrogen atom, an alkyl group of C _{1 to} C ₁₂ , alkoxy groups of ₁ -C _12, alkyl carbonyl group of C 1 _{-C 12,} alkyl amino group of C 1 _{-C 12,} or an alkyl amide group of the _C 1 ~C _{12, Z 31} and _{Z 32} are, It may have a polymerizable group, Z ₃₁ and R ₃₂ and Z ₃₂ and R ₃₄ may form a ring with each other, or a plurality of molecules of Z ₃₁ and Z ₃₂ may be polymerized via a covalent bond. Well, L is divalent It represents a group. The binaphthyl moiety has either (R) or (S) axial asymmetry.

  Further, the present invention is a method for producing a laminated color filter comprising at least one absorption type color filter and at least one reflection type color filter, wherein the absorption type color filter and the reflection type color filter are laminated. Another object of the present invention is to provide a method of manufacturing a multilayer color filter, wherein a reflection type color filter is formed by patterning an area having different spectral characteristics by exposure.

The reflection type color filter forming step is a right circularly polarized light reflecting layer forming step of forming a right circularly polarized light reflecting layer having a plurality of wavelength regions in a plane, and a left circularly polarized light reflecting layer having a plurality of wavelength regions in a plane. Preferably, the method comprises a left circularly polarized light reflecting layer forming step.
The right circularly polarized light reflection layer forming step is performed by applying a polymerizable liquid crystal composition including at least one polymerizable liquid crystal compound, a photoreactive chiral agent having a right-handed property, and a polymerization initiator. Heating the polymerizable liquid crystal composition, the alignment step to make the cholesteric alignment state, by performing an exposure treatment on a part of the polymerizable liquid crystal composition in the cholesteric alignment state in the alignment step, the reflection wavelength region of the exposed part The conversion step of converting, and, by performing an exposure treatment on the entire surface of the polymerizable liquid crystal composition that has been partially converted in the conversion step, a fixing step of fixing the alignment state of the polymerizable liquid crystal composition A coating step of applying a polymerizable liquid crystal composition comprising at least one polymerizable liquid crystal compound, a photoreactive chiral agent having left-handed properties and a polymerization initiator, The polymerizable liquid crystal composition applied in the cloth step was heated, and the alignment step was performed in the cholesteric alignment state, and the exposure was performed by performing an exposure treatment on a part of the polymerizable liquid crystal composition in the cholesteric alignment state in the alignment step. The conversion step of converting the reflection wavelength region of the part, and, by performing an exposure treatment on the entire surface of the polymerizable liquid crystal composition that has been partially converted in the conversion step, a fixing step of fixing the cholesteric alignment state. It is preferred to include.

Further, the step of forming the right-handed circularly polarized light reflecting layer includes the step of applying a polymerizable liquid crystal composition including at least one polymerizable liquid crystal compound, a photoreactive chiral agent having a right-handed property and a polymerization initiator, and the coating step. By heating the applied polymerizable liquid crystal composition, the alignment step of bringing the cholesteric alignment state, and performing the exposure treatment on a part of the polymerizable liquid crystal composition of the cholesteric alignment state, the cholesteric alignment state of the exposed portion. A first fixing step for fixing, a conversion step of converting a reflection wavelength region of the exposed part by performing an exposure process on an unexposed part in the first fixing step, and an orientation state converted in the conversion step. By performing an exposure treatment on the polymerizable liquid crystal composition, the method includes a second fixing step of fixing the alignment state of the polymerizable liquid crystal composition. An application step of applying a polymerizable liquid crystal composition containing a compatible liquid crystal compound, a photoreactive chiral agent having left-handed properties and a polymerization initiator, and heating the polymerizable liquid crystal composition applied in the application step to form a cholesteric alignment state. In the first fixing step of fixing the cholesteric alignment state of the exposed portion by performing an exposure treatment on a part of the polymerizable liquid crystal composition in the cholesteric alignment state, the first fixing step, By performing an exposure process on the unexposed portion, a conversion step of converting the reflection wavelength region of the exposed portion, and, by performing an exposure process on the polymerizable liquid crystal composition whose alignment state has been converted in the conversion step, polymerizable It is preferable to include a second fixing step of fixing the alignment state of the liquid crystal composition.
In addition, before the right circularly polarized light reflecting layer forming step or the left circularly polarized light reflecting layer forming step, an alignment layer coating step of coating a photo alignment film, and the coated light alignment film is exposed to polarized light. It is preferable to include an alignment control step of giving an alignment control force by using the above method.

  Another object of the present invention is to provide an optical sensor having the multilayer color filter of the present invention.

  ADVANTAGE OF THE INVENTION According to this invention, the information of a specific wavelength range can be acquired.

FIG. 1 is a schematic cross-sectional view illustrating an optical sensor having a laminated color filter according to an embodiment of the present invention. It is a schematic diagram which shows the reflection type color filter of the laminated type color filter of embodiment of this invention. It is a schematic diagram which shows the absorption type color filter of the laminated type color filter of embodiment of this invention. FIG. 1 is a schematic diagram illustrating a laminated color filter according to an embodiment of the present invention. 4 is a graph illustrating spectral characteristics of a reflection type color filter of a multilayer type color filter according to an embodiment of the present invention. 4 is a graph showing spectral characteristics of an absorption type color filter of a multilayer color filter according to an embodiment of the present invention. 4 is a graph showing spectral characteristics of the multilayer color filter according to the embodiment of the present invention. 4 is a graph showing spectral characteristics of the multilayer color filter according to the embodiment of the present invention. It is a typical perspective view showing the manufacturing method of the lamination type color filter of the embodiment of the present invention. It is a typical perspective view showing the manufacturing method of the lamination type color filter of the embodiment of the present invention. It is a typical perspective view showing the manufacturing method of the lamination type color filter of the embodiment of the present invention. It is a typical perspective view showing the manufacturing method of the lamination type color filter of the embodiment of the present invention. It is a typical perspective view showing the manufacturing method of the lamination type color filter of the embodiment of the present invention. It is a typical perspective view showing the manufacturing method of the lamination type color filter of the embodiment of the present invention. It is a typical perspective view showing the manufacturing method of the lamination type color filter of the embodiment of the present invention. It is a typical perspective view showing the manufacturing method of the lamination type color filter of the embodiment of the present invention. It is a schematic diagram which shows the reflection type color filter of the laminated type color filter of embodiment of this invention. 4 is a graph illustrating spectral characteristics of a reflection type color filter of a multilayer type color filter according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a laminated color filter according to an embodiment of the present invention. 4 is a graph showing spectral characteristics of the multilayer color filter according to the embodiment of the present invention. It is a schematic diagram which shows the reflection type color filter of the laminated type color filter of embodiment of this invention. 4 is a graph illustrating spectral characteristics of a reflection type color filter of a multilayer type color filter according to an embodiment of the present invention. 4 is a graph illustrating spectral characteristics of a reflection type color filter of a multilayer type color filter according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a laminated color filter according to an embodiment of the present invention. 4 is a graph showing spectral characteristics of the multilayer color filter according to the embodiment of the present invention. 4 is a graph showing spectral characteristics of the multilayer color filter according to the embodiment of the present invention. It is a typical sectional view showing other composition of an optical sensor which has a lamination type color filter of an embodiment of the present invention. It is a schematic diagram which shows other structures of the absorption type color filter of the laminated type color filter of embodiment of this invention. It is a schematic diagram which shows another structure of the reflection type color filter of the laminated type color filter of embodiment of this invention. 4 is a graph showing spectral characteristics of an absorption type color filter of a multilayer color filter according to an embodiment of the present invention. 4 is a graph illustrating spectral characteristics of a reflection type color filter of a multilayer type color filter according to an embodiment of the present invention. 4 is a graph illustrating spectral characteristics of a reflection type color filter of a multilayer type color filter according to an embodiment of the present invention. FIG. 1 is a schematic diagram illustrating a laminated color filter according to an embodiment of the present invention. 4 is a graph showing spectral characteristics of the multilayer color filter according to the embodiment of the present invention. 4 is a graph showing spectral characteristics of the multilayer color filter according to the embodiment of the present invention. It is a schematic diagram which shows the reflection type color filter of the laminated type color filter of embodiment of this invention. It is a schematic diagram which shows the 3rd filter of the laminated type color filter of embodiment of this invention.

Hereinafter, a multilayer color filter, a kit, a method of manufacturing a multilayer color filter, and an optical sensor of the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.
In the following, “to” indicating a numerical range includes the numerical values described on both sides. For example, when ε is a numerical value α to a numerical value β, the range of ε is a range including the numerical value α and the numerical value β, and α ≦ ε ≦ β in mathematical symbols.
Unless otherwise specified, angles and the like include a generally allowable error range.

  FIG. 1 is a schematic sectional view showing an optical sensor having a laminated color filter according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a reflective color filter of the multilayer color filter of the embodiment of the present invention, and FIG. 3 is a schematic diagram showing an absorption color filter of the multilayer color filter of the embodiment of the present invention. FIG. 4 is a schematic view showing a laminated color filter according to the embodiment of the present invention.

The optical sensor 10 shown in FIG. 1 has a sensor unit 12 and a laminated color filter 14.
The sensor unit 12 has a substrate 20, a wiring layer 22, and a photodiode 24.
The sensor unit 12 is generally called a CCD (Charge Coupled Device) having a photodiode 24 or a complementary metal oxide semiconductor (CMOS). The optical sensor 10 can obtain an image corresponding to the laminated color filter 14, and can obtain, for example, a color image represented by three primary colors of red, blue, and green. Note that the color image is not limited to the above-described three primary colors as long as it is represented by a plurality of colors.

In the sensor section 12, for example, a silicon substrate is used as the substrate 20.
The wiring layer 22 electrically connects the sensor unit 12 to the outside, and has a wiring (not shown) made of a conductive material. In the wiring layer 22, the signal charge obtained by the photodiode 24 is output to the outside. A configuration having a readout circuit (not shown) for amplifying the signal charge obtained by the photodiode 24 may be employed.

The photodiode 24 detects light and functions as a light receiving element. For the detection of light, for example, photoelectric conversion is used. A plurality of photodiodes 24 are two-dimensionally arranged, and a specific number of photodiodes 24 constitute one pixel. The photodiode 24 is made of, for example, silicon or germanium.
The photodiode 24 is not particularly limited as long as it can detect light, and a PN junction type, a PIN junction type, a Schottky type, or an avalanche type can be used.

An insulating film 25 is formed on the photodiode 24, and a light-shielding film 26 is formed on the insulating film 25 between itself and the adjacent photodiode 24.
The insulating film 25 is composed of, for example, BPSG (Boron Phosphorus Silicon Glass), but is not limited thereto. The light-shielding film 26 is made of, for example, a metal such as tungsten (W), aluminum (Al), copper (Cu), titanium (Ti), molybdenum (Mo), and nickel (Ni), but is not limited thereto. Not something.

The multilayer color filter 14 has at least one absorption color filter 30 and at least one reflection color filter 32. The absorption type color filter 30 and the reflection type color filter 32 are laminated. When the number of species in the wavelength region of the absorption color filter 30 is m, the number of species in the wavelength region of the reflection color filter 32 is n, and the number of species in the wavelength region of the multilayer color filter 14 is p, p> m ≧ 2 and p> n ≧ 2.
In the multilayer color filter 14, the absorption color filter 30 has two or more wavelength regions, and each wavelength region has a different spectral characteristic as described later. The reflective color filter 32 has two or more wavelength regions, and each wavelength region has a different spectral characteristic as described later.
The absorption type color filter 30 is provided on the insulating film 25, and the wavelength region is provided on the photodiode 24.
The absorption type color filter 30 is provided with a plurality of microlenses 28. A flattening layer 29 is provided on the plurality of microlenses 28. A reflective color filter 32 is provided on the flattening layer 29.

The laminated color filter 14 preferably further has a near-infrared cut layer (not shown) that blocks a part or the whole of the near-infrared region. The arrangement position of the near-infrared cut layer may be above or below the multilayer color filter 14.
Note that the near-infrared region is a wavelength region having a wavelength of 650 to 1200 nm. As the near-infrared cut layer, a known layer that can block light in the near-infrared region described above can be appropriately used.
Since the multilayer color filter 14 has the near-infrared cut layer, the optical sensor 10 can perform photometry with the near-infrared ray removed, thereby reducing noise during photometry.

The micro lens 28 is a convex lens whose center is formed thicker than the edge, and focuses light on the photodiode 24. The plurality of microlenses 28 have the same shape, and the microlenses 28 are provided for each photodiode 24. The micro lens 28 is formed of a resin material such as a styrene resin, an acrylic resin, a styrene-acryl copolymer resin, or a siloxane resin, but is not limited thereto.
The flattening layer 29 is for flattening the microlenses 28 which are convex lenses, and is made of, for example, an acrylic resin material, a styrene resin material, or an epoxy resin material.

  As the absorption color filter 30, a conventional RGB color filter can be used. A known method can be used for the production, and it is useful in that a new production process does not need to be started. Further, a color filter having spectral characteristics other than RGB may be used. A complementary color (YMC) color filter having a transmitted light spectrum in cyan, magenta and yellow regions, and transmitting near-infrared light by cutting visible light. Visible light cut filter. The visible light is light having a wavelength of about 380 nm to 780 nm.

  The reflection type color filter 32 is preferably a cholesteric liquid crystal layer in which a cholesteric liquid crystal phase having circularly polarized light reflection characteristics is fixed. That is, the reflection type color filter 32 preferably has a circularly polarized light reflection characteristic. The cholesteric liquid crystal layer has a property of reflecting either left or right circularly polarized light.

The cholesteric liquid crystal layer can be obtained by fixing the cholesteric liquid crystal phase as described above.
The structure in which the cholesteric liquid crystal phase is fixed may be any structure in which the orientation of the liquid crystal compound in the cholesteric liquid crystal phase is maintained. Any structure may be used as long as it is polymerized and cured by ultraviolet irradiation, heating, or the like, forms a layer having no fluidity, and at the same time, changes into a state in which the orientation form is not changed by an external field or external force.
Note that in a structure in which the cholesteric liquid crystal phase is fixed, it is sufficient that the optical properties of the cholesteric liquid crystal phase be maintained, and the liquid crystal compound does not need to exhibit liquid crystallinity. For example, the polymerizable liquid crystal compound may have a high molecular weight by a curing reaction and lose the liquid crystallinity.

As a material used for forming a cholesteric liquid crystal layer in which a cholesteric liquid crystal phase is fixed, for example, a liquid crystal composition containing a liquid crystal compound is given. The liquid crystal compound is preferably a polymerizable liquid crystal compound.
The liquid crystal composition containing a liquid crystal compound used for forming the cholesteric liquid crystal layer preferably further contains a surfactant. Further, the liquid crystal composition used for forming the cholesteric liquid crystal layer may further contain a chiral agent and a polymerization initiator.

In particular, the liquid phase composition having the right-handed circularly polarized light reflection characteristic is preferably a polymerizable liquid crystal compound, a polymerizable cholesteric liquid crystal composition containing a chiral agent that induces right-handed twist or a polymerization initiator. Further, the liquid phase composition having the left-handed circularly polarized light reflection characteristic is preferably a polymerizable liquid crystal compound, a polymerizable cholesteric liquid crystal composition containing a chiral agent for inducing a left twist or a polymerization initiator.
The polymerizable cholesteric liquid crystal composition preferably contains at least one polymerizable liquid crystal compound having a refractive index anisotropy Δn of 0.2 or more.

--- Polymerizable liquid crystal compound ---
The polymerizable liquid crystal compound may be a rod-shaped liquid crystal compound or a disc-shaped liquid crystal compound, but is preferably a rod-shaped liquid crystal compound.
Examples of the rod-shaped polymerizable liquid crystal compound forming the cholesteric liquid crystal phase include a rod-shaped nematic liquid crystal compound. Examples of the rod-like nematic liquid crystal compound include azomethines, azoxys, cyanobiphenyls, cyanophenyl esters, benzoic esters, cyclohexanecarboxylic acid phenyl esters, cyanophenylcyclohexanes, cyano-substituted phenylpyrimidines, and alkoxy-substituted phenylpyrimidines. , Phenyldioxane, tolan and alkenylcyclohexylbenzonitrile are preferably used. Not only low-molecular liquid crystal compounds but also high-molecular liquid crystal compounds can be used.

  The polymerizable liquid crystal compound is obtained by introducing a polymerizable group into the liquid crystal compound. Examples of the polymerizable group include an unsaturated polymerizable group, an epoxy group, and an aziridinyl group, preferably an unsaturated polymerizable group, and more preferably an ethylenically unsaturated polymerizable group. The polymerizable group can be introduced into the molecule of the liquid crystal compound by various methods. The number of the polymerizable groups contained in the polymerizable liquid crystal compound is preferably 1 to 6, more preferably 1 to 3. Examples of the polymerizable liquid crystal compound are described in Makromol. Chem. 190, 2255 (1989), Advanced Materials 5, 107 (1993), U.S. Pat. Nos. 4,683,327, 5,622,648, 5,770,107, and International Publication WO95 / 22586. JP-A-95 / 24455, JP-A-97 / 60060, JP-A-98 / 23580, JP-A-98 / 52905, JP-A-1-272551, JP-A-6-16616, and JP-A-7-110469. And JP-A-11-80081, and JP-A-2001-328973. Two or more polymerizable liquid crystal compounds may be used in combination. When two or more polymerizable liquid crystal compounds are used in combination, the alignment temperature can be lowered.

Specific examples of the polymerizable liquid crystal compound include compounds represented by the following formulas (1) to (14). In the following formula (11), X ¹ is 2 to 5 (integer).

Further, as described above, in order to obtain a wide bandwidth Δλ and a high reflectance, it is preferable to use a liquid crystal compound exhibiting a high Δn. Specifically, Δn of the liquid crystal compound at 30 ° C. is preferably 0.25 or more, more preferably 0.3 or more, and even more preferably 0.35 or more. The upper limit is not particularly limited, but is often 0.6 or less.
As a method for measuring the refractive index anisotropy Δn, a method using a wedge-shaped liquid crystal cell described on page 202 of a liquid crystal handbook (edited by the liquid crystal handbook editing committee, published by Maruzen Co., Ltd.) is generally used. In this case, evaluation can be performed by using a mixture with another liquid crystal, and the value can be estimated from an extrapolated value.

  Examples of the liquid crystal compound exhibiting a high Δn include, for example, U.S. Pat. The compounds described in JP-A-5,705,465, JP-A-5,721,484, and JP-A-5,723,641 are exemplified.

  Another preferred embodiment of the liquid crystal compound having a polymerizable group is a compound represented by the general formula (6).

A ^{1 to} A ⁴ each independently represent an aromatic carbon ring or a heterocyclic ring which may have a substituent. Examples of the aromatic carbon ring include a benzene ring and a naphthalene ring. As the heterocycle, a furan ring, a thiophene ring, a pyrrole ring, a pyrroline ring, a pyrrolidine ring, an oxazole ring, an isoxazole ring, a thiazole ring, an isothiazole ring, an imidazole ring, an imidazoline ring, an imidazolidine ring, a pyrazole ring, a pyrazoline ring, Pyrazolidine ring, triazole ring, furazane ring, tetrazole ring, pyran ring, thiine ring, pyridine ring, piperidine ring, oxazine ring, morpholine ring, thiazine ring, pyridazine ring, pyrimidine ring, pyrazine ring, piperazine ring, and triazine ring No. Among them, A1 to A4 are preferably aromatic carbocycles, and more preferably benzene rings.
The type of the substituent that may be substituted on the aromatic carbocycle or the heterocyclic ring is not particularly limited, and examples thereof include a halogen atom, a cyano group, a nitro group, an alkyl group, a halogen-substituted alkyl group, an alkoxy group, an alkylthio group, and an acyloxy group. , An alkoxycarbonyl group, a carbamoyl group, an alkyl-substituted carbamoyl group, and an acylamino group having 2 to 6 carbon atoms.

X ¹ and X ² are each independently a single bond, -COO -, - OCO -, - CONH -, - NHCO -, - CH 2 CH 2 -, - OCH 2 -, - CH 2 O -, - CH ＣＨCH—, —CH ＝ CH—COO—, —OCO—CH ＝ CH— or —C≡C—. Among them, a single bond, -COO-, -CONH-, -NHCO- or -C≡C- is preferable.
Y ¹ and Y ² are each independently a single bond, -O -, - S -, - CO -, - COO -, - OCO -, - CONH -, - NHCO -, - CH = CH -, - CH ＣＨCH—COO—, —OCO—CH ＝ CH—, or —C≡C—. Among them, -O- is preferable.
Sp ¹ and Sp ² each independently represent a single bond or a carbon chain having 1 to 25 carbon atoms. The carbon chain may be linear, branched, or cyclic. As the carbon chain, a so-called alkyl group is preferable. Among them, an alkyl group having 1 to 10 carbon atoms is more preferable.

P ¹ and P ² each independently represent a hydrogen atom or a polymerizable group, and at least one of P ¹ and P ² represents a polymerizable group. Examples of the polymerizable group include a polymerizable group included in the above-described liquid crystal compound having a polymerizable group.
n ¹ and n ² each independently represent an integer of 0 to 2, and when n ¹ or n ² is 2, a plurality of A ¹ , A ² , X ¹ and X ² may be the same or different Good.

  Specific examples of the compound represented by the general formula (6) include compounds represented by the following formulas (2-1) to (2-30).

  Further, as the polymerizable liquid crystal compound other than those described above, a cyclic organopolysiloxane compound having a cholesteric phase as disclosed in JP-A-57-165480 can be used. Further, as the above-mentioned polymer liquid crystal compound, a polymer in which a mesogen group exhibiting a liquid crystal is introduced into a main chain, a side chain, or both positions of the main chain and the side chain, and a polymer cholesteric in which a cholesteryl group is introduced into a side chain. Liquid crystal, a liquid crystalline polymer as disclosed in JP-A-9-133810, a liquid crystalline polymer as disclosed in JP-A-11-293252, and the like can be used.

  The amount of the polymerizable liquid crystal compound in the liquid crystal composition is preferably from 75 to 99.9% by mass, and more preferably from 80 to 99% by mass, based on the solid content of the liquid crystal composition (the mass excluding the solvent). %, More preferably from 85 to 90% by mass.

  A technique for converting the spectral characteristics of the reflection wavelength by exposure is described in Fujifilm Research Report No. 50 (2005) p. 60-63 has a detailed description. This technique is characterized in that a chiral agent having a site that isomerized by light is used, and its reflection wavelength can be converted by exposure. Also in the present invention, by applying this technique, it is possible to easily form a reflection type color filter having a plurality of spectral characteristics.

--- Chiral agent (optically active compound)-
The chiral agent has a function of inducing a helical structure of a cholesteric liquid crystal phase. The chiral agent has a different helix direction or helix pitch depending on the compound, and may be selected according to the purpose.
That is, when having the right circularly polarized light reflection characteristic, a chiral agent that induces a right twist may be used, and when having the left circularly polarized light reflection characteristic, a chiral agent that induces a left twist may be used.

The chiral agent is not particularly limited, and is a known compound (eg, Liquid Crystal Device Handbook, Chapter 3, Section 4-3, chiral agent for TN (twisted nematic), STN (Super Twisted Nematic), page 199, Japan Society for the Promotion of Science) 142th Committee, 1989), isosorbide and isomannide derivatives.
The chiral agent generally contains an asymmetric carbon atom, but an axially asymmetric compound or a planar asymmetric compound containing no asymmetric carbon atom can also be used as the chiral agent. Examples of the axially or planarly asymmetric compound include binaphthyl, helicene, paracyclophane, and derivatives thereof. The chiral agent may have a polymerizable group. When both the chiral agent and the liquid crystal compound have a polymerizable group, a repeating unit derived from the polymerizable liquid crystal compound and a derivative derived from the chiral agent by a polymerization reaction between the polymerizable chiral agent and the polymerizable liquid crystal compound. A polymer having a repeating unit can be formed. In this embodiment, the polymerizable group of the polymerizable chiral agent is preferably the same type of group as the polymerizable group of the polymerizable liquid crystal compound. Therefore, the polymerizable group of the chiral agent is also preferably an unsaturated polymerizable group, an epoxy group or an aziridinyl group, more preferably an unsaturated polymerizable group, and more preferably an ethylenically unsaturated polymerizable group. More preferred. Further, the chiral agent may be a liquid crystal compound.

The case where the chiral agent has a photoisomerizable group is preferable because a pattern having a desired reflection wavelength corresponding to the emission wavelength can be formed by irradiation with a photomask such as active light after coating and orientation.
As the photoisomerizable group, an isomerization site of a compound exhibiting photochromic properties, an azo group, an azoxy group, and a cinnamoyl group are preferable. As specific compounds, JP-A-2002-80478, JP-A-2002-80851, JP-A-2002-179633, JP-A-2002-179668, JP-A-2002-179669, and JP-A-2002 179670, JP-A-2002-179681, JP-A-2002-179682, JP-A-2002-302487, JP-A-2002-338575, JP-A-2002-338668, JP-A-2003-306490 JP-A-2003-306491, JP-A-2003-313187, JP-A-2003-313188, JP-A-2003-313189, JP-A-2003-313292 and JP-A-2000-147236. The compounds described can be used

  Specifically, as the photoreactive chiral agent, compounds represented by the following general formulas (1) to (5) can be used.

In the formula, A ₁₁ and A ₁₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₁₁ —, and Ar ₁₁ represents an aromatic carbon ring which may have a substituent or R ₁₁ and R ₁₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or an aromatic carbon ring which may have a substituent; Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₁₂ and R ₁₄ each independently represent a hydrogen atom or a C _{1 to} C ₁₂ of an alkyl _{group, B 11} and _{B 12} each independently -C is _{(= O) - (Ar 12} ) n 11 - , or _{-C (= O) -Ar 13 -N} = X 11 -Ar 14 - a represents , _{X 11} represents N or CH, _{Ar 12} Ar ₁₃ and Ar ₁₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₁₁ represents an integer of 0 to 2, When n ₁₁ is 2, a plurality of Ar ₁₂ may be the same or different, and Z ₁₁ and Z ₁₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₁₁ and Z ₁₂ may have a polymerizable group. Z ₁₁ and R ₁₂ and Z ₁₂ and R ₁₄ may form a ring with each other, and Z ₁₁ and Z ₁₂ of a plurality of molecules may be polymerized via a covalent bond.
More specifically, the compound represented by the general formula (1) is described in JP-A-2002-080851, JP-A-2002-179681, JP-A-2002-179682, JP-A-2002-338575, It is described in JP-A-2002-338668, JP-A-2003-306490, JP-A-2003-3066491, JP-A-2003-313187, JP-A-2003-313189, and JP-A-2003-313292. ing.

In the formula, A ₂₁ and A ₂₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₂₁ —, and Ar ₂₁ represents an aromatic carbon ring which may have a substituent or Represents an aromatic heterocyclic ring which may have a substituent, wherein R ₂₁ and R ₂₃ each independently represent a hydrogen atom, an alkyl group of C _{1 to} C ₁₂ , or an aromatic carbon ring which may have a substituent Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₂₂ and R ₂₄ are each independently a hydrogen atom or a C _{1 to} C ₁₂ represents an alkyl _{group, B 21} and _{B 22} are each independently _{-C (= O) - (Ar} 22) n 21 - , or _{-C (= O) -Ar 23 -N} = X 21 -Ar 24 - a represents , _{X 21} represents N or CH, _{Ar 22} Ar ₂₃ and Ar ₂₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₂₁ represents an integer of 0 to 2, When n ₂₁ is 2, a plurality of Ar ₂₂ may be the same or different, and Z ₂₁ and Z ₂₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₂₁ and Z ₂₂ may have a polymerizable group. Z ₂₁ and R ₂₂ and Z ₂₂ and R ₂₄ may form a ring with each other, and a plurality of molecules of Z ₂₁ and Z ₂₂ may be polymerized via a covalent bond.
The compound represented by the general formula (2) is more specifically described in JP-A-2002-080478 and JP-A-2003-313188.

In the formula, A ₃₁ and A ₃₂ each independently represent a single bond or —O—C (＝ O) —, —O—C (ＡｒO) —Ar ₃₁ —, wherein Ar ₃₁ has a substituent. R ₃₁ and R ₃₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or a substituent. And an optionally substituted aromatic carbocycle, an optionally substituted aromatic heterocycle, a cyano group, or a C ₁ -C ₁₂ alkyloxycarbonyl group, wherein R ₃₂ and R ₃₄ each independently represent hydrogen. Represents an atom or an alkyl group of C _{1 to} C ₁₂ , B ₃₁ and B ₃₂ each independently represent a single bond, —C (＝ O) — (Ar ₃₂ ) n ₃₁ — or —C (＝ O) —Ar ₃₃ — N ₌ X 31 _{-Ar 34} - _{represents, X 31} is N or Or Ar represents Ar ₃₂ , Ar ₃₃ and Ar ₃₄ each independently represents an aromatic carbon ring which may have a substituent or an aromatic heterocyclic ring which may have a substituent, and n ₃₁ Represents an integer of 0 to 2, and when n ₃₁ is 2, a plurality of Ar ₃₂ may be the same or different; Z ₃₁ and Z ₃₂ each independently represent a hydrogen atom; a C _{1 to} C ₁₂ alkyl group; A C ₁ -C ₁₂ alkoxy group, a C ₁ -C ₁₂ alkylcarbonyloxy group, a C ₁ -C ₁₂ alkylamino group, or a C ₁ -C ₁₂ alkylamide group, wherein Z ₃₁ and Z ₃₂ are May have a polymerizable group, Z ₃₁ and R ₃₂ and Z ₃₂ and R ₃₄ may form a ring with each other, and a plurality of molecules of Z ₃₁ and Z ₃₂ are polymerized through a covalent bond. And L is It represents the valence of the group. The binaphthyl moiety has either (R) or (S) axial asymmetry.
More specifically, the compound represented by the general formula (3) is described in JP-A-2002-179668, JP-A-2002-179669, JP-A-2002-179670, and JP-A-2002-302487. Has been described.

In the formula, A ₄₁ and A ₄₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₄₁ —, and Ar ₄₁ represents an aromatic carbon ring which may have a substituent or Represents an aromatic heterocyclic ring which may have a substituent, wherein R ₄₁ and R ₄₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or an aromatic carbon ring which may have a substituent; Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₄₂ and R ₄₄ are each independently a hydrogen atom or a C _{1 to} C ₁₂ represents an alkyl _{group, B 41} and _{B 42} are each independently _{-C (= O) - (Ar} 42) n 41 - , or _{-C (= O) -Ar 43 -N} = X 41 -Ar 44 - a represents , _{X 41} represents N or CH, _{Ar 42} Ar ₄₃ and Ar ₄₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₄₁ represents an integer of 0 to 2, When n ₄₁ is 2, a plurality of Ar ₄₂ may be the same or different, and Z ₄₁ and Z ₄₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₄₁ and Z ₄₂ may have a polymerizable group. Z ₄₁ and R ₄₂ and Z ₄₂ and R ₄₄ may form a ring with each other, a plurality of molecules Z ₄₁ and Z ₄₂ may be polymerized through a covalent bond, and R ₄₅ and R ₄₆ C ₁ -C ₃₀ And may form a ring with each other. * Represents an asymmetric carbon.
The compound represented by the general formula (4) is more specifically described in JP-A-2002-179633.

Wherein, P ₅₁ represents a polymerizable group, Sp ₅₁ represents an alkylene group of a single bond or C ₁ ~ _12, plurality of carbon atoms may be replaced by an oxygen atom or a carbonyl group, X ₅₁ represents a single bond Or represents an oxygen atom, Ar ₅₁ and Ar ₅₂ each independently represent an aromatic carbon ring which may have a substituent or an aromatic heterocyclic ring which may have a substituent, and L ₅₁ is a single bond Or n represents a divalent linking group, n ₅₁ represents an integer of 1 to 3, and when n ₅₁ is 2 or more, a plurality of Ar ₅₁ and L ₅₁ may be the same or different from each other, and R ₅₂ is asymmetric. Represents a side chain containing carbon.
The compound represented by the general formula (5) is more specifically described in JP-A-2000-147236.

  The content of the chiral agent in the liquid crystal composition is preferably from 0.01 mol% to 200 mol%, more preferably from 1 mol% to 30 mol%, based on the amount of the polymerizable liquid crystal compound.

  The content of the chiral agent in the liquid crystal composition is preferably from 0.01 mol% to 200 mol%, more preferably from 1 mol% to 30 mol%, based on the amount of the polymerizable liquid crystal compound.

  The cholesteric liquid crystal composition of the present invention may contain two or more chiral agents, and by mixing the above-described chiral agent having a photoisomerizable group and the chiral agent not having a photoisomerizable group. , Torsional strength (HTP (Helical Twisting Power)) and photoisomerization ability can be adjusted.

--- Polymerization initiator ---
When the liquid crystal composition contains a polymerizable compound, it preferably contains a polymerization initiator. In an embodiment in which the polymerization reaction is advanced by ultraviolet irradiation, the polymerization initiator used is preferably a photopolymerization initiator capable of initiating the polymerization reaction by ultraviolet irradiation. Examples of the photopolymerization initiator include α-carbonyl compounds (described in U.S. Pat. Nos. 2,367,661 and 2,367,670), acyloin ethers (described in U.S. Pat. No. 2,448,828), and α-hydrocarbon-substituted aromatic compounds. Group acyloin compounds (described in U.S. Pat. No. 2,722,512), polynuclear quinone compounds (described in U.S. Pat. Nos. 3,046,127 and 2,951,758), and a combination of triarylimidazole dimer and p-aminophenyl ketone (U.S. Pat. No. 3549367), acridine and phenazine compounds (described in JP-A-60-105667, U.S. Pat. No. 4,239,850) and oxadiazole compounds (described in U.S. Pat. No. 4,221,970). .
The content of the photopolymerization initiator in the liquid crystal composition is preferably from 0.1 to 20% by mass, more preferably from 0.5 to 12% by mass, based on the content of the polymerizable liquid crystal compound. .

--- Crosslinking agent ---
The liquid crystal composition may optionally contain a crosslinking agent for improving film strength and durability after curing. As the cross-linking agent, those which are cured by ultraviolet light, heat, moisture and the like can be suitably used.
The crosslinking agent is not particularly limited and may be appropriately selected depending on the intended purpose. Examples thereof include polyfunctional acrylate compounds such as trimethylolpropane tri (meth) acrylate and pentaerythritol tri (meth) acrylate; glycidyl (meth) acrylate , An epoxy compound such as ethylene glycol diglycidyl ether; an aziridine compound such as 2,2-bishydroxymethylbutanol-tris [3- (1-aziridinyl) propionate] and 4,4-bis (ethyleneiminocarbonylamino) diphenylmethane; Isocyanate compounds such as methylene diisocyanate and biuret type isocyanate; polyoxazoline compounds having an oxazoline group in a side chain; vinyltrimethoxysilane, N- (2-aminoethyl) 3-aminopropyl Alkoxysilane compounds such as methoxy silane. In addition, a known catalyst can be used according to the reactivity of the crosslinking agent, and productivity can be improved in addition to improvement in film strength and durability. These may be used alone or in combination of two or more.
The content of the crosslinking agent is preferably from 3 to 20% by mass, more preferably from 5 to 15% by mass, based on the solid content of the liquid crystal composition. When the content of the crosslinking agent is within the above range, the effect of improving the crosslinking density is easily obtained, and the stability of the cholesteric liquid crystal phase is further improved.

--- Polymerization inhibitor--
The polymerization inhibitor is added to the liquid crystal composition for the purpose of improving storage stability. Examples of the polymerization inhibitor include hydroquinone, hydroquinone monomethyl ether, phenothiazine, benzoquinone, hindered amine (HALS) and derivatives thereof, and these may be added in an amount of 0 to 10% by mass based on the liquid crystal compound. Preferably, 0 to 5% by mass is added.

The liquid crystal composition is preferably used as a liquid when forming a cholesteric liquid crystal layer.
The liquid crystal composition may include a solvent. The solvent is not particularly limited and may be appropriately selected depending on the purpose. However, an organic solvent is preferably used.
The organic solvent is not particularly limited and can be appropriately selected depending on the intended purpose. Examples include ring compounds, hydrocarbons, esters, ethers, and the like. These may be used alone or in combination of two or more. Among these, ketones are preferable in consideration of the load on the environment. The above components such as the above monofunctional polymerizable monomers may function as a solvent.

--- Kit ---
The kit according to the present invention comprises a polymerizable liquid crystal compound containing at least one or more polymerizable liquid crystal compounds, a photoreactive chiral agent having right-handed properties and a polymerization initiator, at least one or more polymerizable liquid crystal compounds, It is composed of a polymerizable liquid crystal composition containing a photoreactive chiral agent having a twisting property and a polymerization initiator.
The photoreactive chiral agent having the right-handed property is, for example, one represented by the above general formula (1) or general formula (3). The photoreactive chiral agent having the left-handed property is, for example, one represented by the above-mentioned general formula (2) or (3).
The kit may be divided into a plurality of polymerizable liquid crystal compositions instead of one.

A cholesteric layer having right circularly polarized light reflection characteristics (hereinafter, also simply referred to as a right circularly polarized light cholesteric layer) is, for example, a liquid crystal composition having a right circularly polarized light reflection characteristic including a chiral agent that induces right torsion is formed on a substrate. It may be formed by performing a step of applying the cholesteric liquid crystal phase having a right-handed circularly polarized light reflection characteristic by heating, and a step of fixing the cholesteric liquid crystal phase by irradiation with ultraviolet rays (exposure to ultraviolet rays).
On the other hand, a cholesteric layer having left circularly polarized light reflection characteristics (hereinafter, also simply referred to as a left circularly polarized light cholesteric layer) is, for example, a liquid crystal composition having left circularly polarized light reflection characteristics including a chiral agent that induces left twist. Applying the cholesteric liquid crystal layer on the previously formed right circularly polarized cholesteric layer, heating to form a cholesteric liquid crystal phase having a right circularly polarized light reflection characteristic, and immobilizing the cholesteric liquid crystal phase by irradiation with ultraviolet rays (exposure to ultraviolet rays). A process may be performed to form the gate electrode.
Note that the application, drying, and irradiation of ultraviolet rays of the liquid crystal composition may be performed by any known method.

Here, as described above, as the chiral agent, a chiral agent having a light-isomerizable portion (photoisomerizable group) such as a cinnamoyl group can be used. When a chiral agent having a photoisomerization group is used as the chiral agent of the liquid crystal composition, after applying the liquid crystal composition and heating, patterning and irradiating weak ultraviolet light is performed at least once. Then, the photoisomerizable group may be isomerized, and then irradiation with ultraviolet light for fixing the cholesteric liquid crystal phase may be performed.
Also, after partially curing by patterning and irradiating strong ultraviolet light for fixing the cholesteric liquid crystal phase, the photoisomerizable group isomerized by irradiating weak ultraviolet light to the unexposed part or the entire surface, Thereafter, irradiation with ultraviolet rays for fixing the cholesteric liquid crystal phase may be performed.
Accordingly, the right circularly polarized cholesteric layer and the left circularly polarized cholesteric layer can have a configuration in which a plurality of reflection regions that reflect light in different wavelength regions are provided in a plane. In this case, it is preferable that the right circularly polarized cholesteric layer and the left circularly polarized cholesteric layer have a reflection region that reflects light in the same wavelength region at the same position in the plane direction.

  Further, by adjusting the temperature at the time of irradiating ultraviolet rays, it is also possible to adjust the reflection wavelength region. By adjusting the temperature and patterning and irradiating the ultraviolet light, the right circularly polarized cholesteric layer and the left circularly polarized cholesteric layer have, in a plane, a plurality of reflection regions that reflect light in different wavelength regions, and a configuration having a plurality of reflection regions. it can. In particular, by irradiating the liquid crystal composition with ultraviolet rays in a state where the liquid crystal composition is heated to a temperature equal to or higher than the isotropic phase temperature, a transmissive region having no reflection characteristics in any wavelength region can be formed in a plane.

Note that the right circularly polarized cholesteric layer or the left circularly polarized cholesteric layer may be one layer at a time, or may be a multilayer configuration having at least one right circularly polarized cholesteric layer and one left circularly polarized cholesteric layer.
The wavelength range of the light to be reflected, that is, the wavelength range of the light to be blocked can be widened by sequentially stacking layers in which the central wavelength λ of the selective reflection is shifted. There is also known a technique called “pitch gradient method” for expanding the wavelength range by a method of changing the helical pitch in a layer in a stepwise manner. Specifically, Nature 378, 467-469 (1995), and Japanese Unexamined Patent Application Publication No. For example, the method described in Japanese Patent No. 281814 and Japanese Patent No. 4990426 may be used.
The reflection wavelength range of the right circularly polarized cholesteric layer and the left circularly polarized cholesteric layer in the present invention is set to any range of visible light (wavelength of about 380 nm to 780 nm) and near infrared light (wavelength of about 780 nm to 2000 nm). Is possible, and the setting method is as described above.

  The reflection type color filter forming step includes, for example, a right circularly polarized light reflecting layer forming step of forming a right circularly polarized light reflecting layer having a plurality of wavelength regions in a plane, and a left circularly polarized light reflecting layer having a plurality of wavelength regions in a plane. Forming a left circularly polarized light reflection layer.

The right circularly polarized light reflecting layer forming step includes, for example, a coating step of applying a polymerizable liquid crystal composition including at least one polymerizable liquid crystal compound, a photoreactive chiral agent having right-handed properties and a polymerization initiator, and a coating step. By heating the polymerizable liquid crystal composition applied in the above, the alignment step to the cholesteric alignment state, by performing an exposure treatment on a part of the polymerizable liquid crystal composition in the cholesteric alignment state in the alignment step, the exposed portion A conversion step of converting the reflection wavelength region, and a fixing step of fixing the alignment state of the polymerizable liquid crystal composition by performing an exposure treatment on the entire surface of the polymerizable liquid crystal composition whose alignment state has been partially converted in the conversion step. A conversion step may be performed.
The left circularly polarized light reflecting layer forming step includes, for example, a coating step of applying a polymerizable liquid crystal composition containing at least one polymerizable liquid crystal compound, a photoreactive chiral agent having left-handed properties and a polymerization initiator, and a coating step. By heating the polymerizable liquid crystal composition applied in the above, the alignment step to the cholesteric alignment state, by performing an exposure treatment on a part of the polymerizable liquid crystal composition in the cholesteric alignment state in the alignment step, the exposed portion A conversion step of converting the reflection wavelength region, and
An exposure treatment may be performed on the entire surface of the polymerizable liquid crystal composition in which a part of the alignment state has been converted in the conversion step to perform a fixing step of fixing the cholesteric alignment state.

The right circularly polarized light reflecting layer forming step is, as another example, a coating step of applying a polymerizable liquid crystal composition including at least one polymerizable liquid crystal compound, a photoreactive chiral agent having a right-handed property and a polymerization initiator, The polymerizable liquid crystal composition applied in the application step is heated, and the alignment step of bringing the cholesteric alignment state is performed. A first fixing step of fixing the alignment state, a conversion step of converting the reflection wavelength region of the exposed part by performing an exposure process on the unexposed part in the first fixing step, and an alignment state in the conversion step The second fixing step of fixing the alignment state of the polymerizable liquid crystal composition by subjecting the polymerizable liquid crystal composition obtained by converting the above to exposure treatment may be performed.
The left circularly polarized light reflecting layer forming step is, as another example, a coating step of applying a polymerizable liquid crystal composition including at least one polymerizable liquid crystal compound, a photoreactive chiral agent having a left-handed property and a polymerization initiator, The polymerizable liquid crystal composition applied in the application step is heated, and the alignment step of bringing the cholesteric alignment state is performed. A first fixing step of fixing the alignment state, a conversion step of converting the reflection wavelength region of the exposed part by performing an exposure process on the unexposed part in the first fixing step, and an alignment state in the conversion step The second fixing step of fixing the alignment state of the polymerizable liquid crystal composition by subjecting the polymerizable liquid crystal composition obtained by converting the above to exposure treatment may be performed.

  Before the right circularly polarized light reflecting layer forming step or the left circularly polarized light reflecting layer forming step, an alignment layer coating step of applying a photo alignment film, and the coated and formed photo alignment film is exposed to polarized light to regulate the alignment. It is preferable to perform an alignment regulating step for giving a force.

  Hereinafter, a configuration example of the multilayer color filter 14 of the present invention will be described more specifically. The essence of the present invention is to easily obtain a color filter having a large number of spectral characteristics by combining the absorption type color filter 30 and the reflection type color filter 32, and there is no limitation on the combination method. Absent. The present invention is not limited to the following configuration, and the configuration can be freely changed without departing from the gist of the present invention.

  It should be noted that the spectral characteristic diagram illustrated below is a conceptual diagram for explaining a change in spectral characteristic due to a combination of an absorption type color filter and a reflection type color filter, and is different from an actual spectral shape.

The absorption type color filter 30 is, for example, a color filter of three primary colors of red, blue and green. As shown in FIG. 3, the absorption type color filter 30 has a Bayer arrangement of a red wavelength region 30R, a green wavelength region 30G, and a blue wavelength region 30B. The red wavelength region 30R, the green wavelength region 30G, and the blue wavelength region 30B have different spectral characteristics.
The absorption type color filter 30 has a plurality of first sections 31. In the first section 31, two green wavelength regions 30G, one red wavelength region 30R, and one blue wavelength region 30B are arranged.
The absorption type color filter 30 has three wavelength regions, namely, a red wavelength region 30R, a green wavelength region 30G, and a blue wavelength region 30B having different spectral characteristics. What is necessary is just to have an area.

FIG. 6 shows the spectral characteristics of the absorption type color filter 30. As shown in FIG. 6, the red wavelength region 30R has a spectral characteristic 33R, the green wavelength region 30G has a spectral characteristic 33G, and the blue wavelength region 30B has a spectral characteristic 33B, and the spectral characteristics are different.
In FIG. 6, the transmittance is low in both the ultraviolet region (ie, the left side of the blue wavelength region) and the infrared region (ie, the right side of the red wavelength region). In order to actually realize such spectral characteristics, it is necessary to include an ultraviolet absorber and an infrared absorber in each of the red, blue and green regions of a normal color filter, or to use a normal absorption type color filter and an ultraviolet absorption layer. (Ie, an ultraviolet cut filter) and an infrared absorbing layer (ie, an infrared cut filter) may be used in combination. These wavelength cut filters used in combination are not necessarily integrated with the absorption type cut filter, the measurement object in the optical sensor using the laminated color filter of the present invention, between the imaging element that detects light What is necessary is just to be arrange | positioned in arbitrary places.

  The red wavelength region 30R transmits, for example, red light having a wavelength of 570 nm to 700 nm in a long wavelength region of a visible light region and absorbs light other than red light. The green wavelength region 30G transmits, for example, green light having a wavelength of 480 nm to 600 nm in the middle wavelength region of the visible light region and absorbs light other than green light. The blue wavelength region 30B transmits blue light having a wavelength of 400 nm to 500 nm in a short wavelength region of the visible light region, and absorbs light other than blue light.

As shown in FIG. 1, the reflection type color filter 32 and the absorption type color filter 30 constitute the multilayer color filter 14. The reflection type color filter 32 is disposed on the flattening layer 29. The reflection type color filter 32 has a plurality of second sections 32a, as shown in FIG. The absorption type color filter 30 and the reflection type color filter 32 are laminated such that the first section 31 (see FIG. 3) and the second section 32a (see FIG. 2) are aligned.
As shown in FIG. 1, a micro lens 28 is provided between an absorption type color filter 30 and a reflection type color filter 32, and the absorption type color filter 30 and the reflection type color filter 32 are laminated. However, the absorption type color filter 30 and the reflection type color filter 32 may be stacked in a state of being in direct contact with each other.
As shown in FIGS. 1 and 2, the reflection type color filter 32 has two wavelength regions of a first wavelength region 34 and a second wavelength region 35 having different spectral characteristics.
The first wavelength region 34 or the second wavelength region 35 is arranged for each second section 32a of the reflection type color filter 32. In the reflective color filter 32 shown in FIG. 2, the same wavelength region is not arranged in the adjacent second section 32a.

  FIG. 5 shows the spectral characteristics of the first wavelength region 34 and the second wavelength region 35 of the reflective color filter 32. The first wavelength region 34 has a spectral characteristic 34a. The first wavelength region 34 includes a part of the light transmitted through the blue wavelength region 30B, including the region where the light transmitted through the blue wavelength region 30B and the light transmitted through the green wavelength region 30G overlap, as indicated by the spectral characteristics 34a. And a part of the light transmitted through the green wavelength region 30G is not transmitted.

The second wavelength region 35 has a spectral characteristic 35a. The second wavelength region 35 does not transmit light on a longer wavelength side than the first wavelength region 34.
The second wavelength region 35 is a part of the light transmitted through the green wavelength region 30G, including the region where the light transmitted through the green wavelength region 30G and the light transmitted through the red wavelength region 30R overlap as shown in the spectral characteristic 35a. And a part of the light transmitted through the red wavelength region 30R is not transmitted. Thus, the first wavelength region 34 and the second wavelength region 35 have different spectral characteristics. The reflection type color filter 32 is preferably formed by curing a polymerizable cholesteric liquid crystal composition.

The laminated color filter 14 is as shown in FIG. 4 when viewed from the incident light side. The multilayer color filter 14 shown in FIG. 4 is a combination of the absorption color filter 30 and the reflection color filter 32. 7 and 8 show the spectral characteristics of the multilayer color filter 14. FIG.
As shown in FIG. 4, the multilayer color filter 14 includes a first green wavelength region 30G ₁ two, one pixel region in the first blue wavelength region 30B _1, the first red wavelength region 30R ₁ 31a is constituted. Further, two second green wavelength region 30G _2, and second blue wavelength region 30B _2, 1 single pixel area 31b is composed of a second red wavelength region 30R _2. Thus, there are two types of pixel regions 31a and 31b.

Spectral characteristics of the pixel area 31a of the multilayer color filter 14, as shown in FIG. 7, the first blue wavelength region 30B ₁ has a spectral characteristic 36B _1. The first green wavelength region 30G ₁ has the spectral characteristics 36G _1. The first red wavelength region 30R ₁ has the spectral characteristics 36R _1.
Spectral characteristics of the pixel region 31b of the multilayer color filter 14, as shown in FIG. 8, a second blue wavelength region 30B ₂ has the spectral characteristics 36B _2. Second green wavelength region 30G ₂ has a spectral characteristic 36G _2. The second red wavelength region 30R ₂ has a spectral characteristic 36R _2.

  From the spectral characteristics shown in FIGS. 6, 7, and 8, the multilayer color filter 14 has a red wavelength region, a green wavelength region, and a blue wavelength region as compared with the three primary color filters of red, blue, and green. , Light of different wavelength ranges can be transmitted. That is, multiple gradations can be obtained. The absorption color filter 30 has three wavelength regions, the reflection color filter 32 has two wavelength regions, and the multilayer color filter 14 has six gradations. The number of species of the multilayer color filter 14 is greater than the sum of the number of species in the wavelength region of the absorption color filter 30 and the number of species of the reflection color filter 32. Thus, the optical sensor 10 can acquire information on a specific wavelength range in addition to the color image represented by the three primary colors. For example, a specific wavelength region can be detected in the green wavelength region. In the red wavelength region, a specific wavelength region can be detected.

In the present invention, the absorption type color filter 30 having m kinds of wavelength regions and the reflection type color filter 32 having n kinds of wavelength regions are overlapped with each other in different combinations, so that the absorption type color filter 30 is formed. And the reflection type color filter 32, it is possible to obtain the genus p of the wavelength region exceeding the genus (m, n) of the wavelength region of each color filter. The maximum value of the genus p of the wavelength region generated at this time is m × n.
Here, the band which the reflection type color filter can block is limited to about 150 nm. Therefore, when the multilayer color filter 14 is a combination of the reflection type color filter and the reflection type color filter, a region other than the specific wavelength is used. Need to be shielded. In a reflection type color filter, it is necessary to stack a considerable number of layers in order to block a region other than a specific wavelength, which is complicated in terms of configuration and production.

Next, a method of manufacturing the multilayer color filter 14 will be described more specifically. The absorption type color filter 30 is, for example, a color filter of three primary colors and can be manufactured by the same manufacturing method as that used for an imaging device such as a CCD (Charge Coupled Device). Omitted.
A method of manufacturing the reflection type color filter 32 will be described with reference to FIGS.
9 to 16 are schematic perspective views illustrating a method of manufacturing a multilayer color filter according to an embodiment of the present invention in the order of steps.

As shown in FIG. 9, a base layer 42 is formed on a substrate 40, and a reflective layer 44 is formed on the base layer 42 by using a polymerizable liquid crystal composition containing a right-handed chiral agent having a photoisomerizable group. A liquid crystal composition layer is prepared. Next, as shown in FIG. 10, an exposure mask 46 having a predetermined pattern is arranged on the reflection layer 44. Then, the light L ₁ is irradiated on the reflective layer 44 over the exposure mask 46 to expose the exposure area 45. As a result, photoisomerization of the chiral agent occurs in the exposure region 45, and the wavelength of the reflected light changes accordingly. FIG. 10 schematically shows a patterning state. In the actual manufacture of an optical sensor, a fine pattern is formed using an i-line stepper or the like. There is an optical system composed of a plurality of lenses and the like.

After removing the exposure mask 46, as shown in FIG. 11, is irradiated with light L ₂ to the reflective layer 44 over the entire surface. As a result, the cholesteric liquid crystal composition is polymerized and fixed, and the wavelength of reflected light in the reflective layer 44 is fixed. As shown in FIG. 12, the first region 47 and the second region 47 whose reflected light wavelengths are different from each other. Thus, a right circularly polarized light reflection type color filter 49a having a color filter 48 is obtained. Light L ₁ and the light L ₂ are both ultraviolet light, toward the light L ₂ is higher light intensity than the light L _2. In order to accelerate the polymerization immobilized by light L _2, it is preferable to perform the steps of FIG. 11 under a nitrogen atmosphere.
The underlayer 42 is a layer for horizontally aligning the cholesteric liquid crystal composition. In order to make the alignment uniform, the underlayer 42 is preferably a photo-alignment film. By irradiating linearly polarized light in advance, it is possible to give an alignment regulating force to the liquid crystal, and to obtain a uniform reflective layer. it can.

Similarly to the above-described right circularly polarized light reflection type color filter 49a, a left circularly polarized light reflection type having a first region 47a (see FIG. 16) and a second region 48a (see FIG. 16) having different wavelengths of reflected light. The color filter 49b (see FIG. 16) is formed on the right circularly polarized light reflection type color filter 49a.
The left circularly polarized light reflection type color filter 49b (see FIG. 16) is different from that shown in FIG. 13 in that the reflection layer 44a is formed using a polymerizable liquid crystal composition containing a left-handed chiral agent having an isomerization group. Can be manufactured in the same manner as the right circular polarization reflection type color filter 49a.

As shown in FIG. 14, the above-described exposure mask 46 is disposed on the reflection layer 44a. Then, the light _{L 1} is irradiated on a reflective layer 44a from above the exposure mask 46 to expose the exposure area 45a. As a result, photoisomerization of the chiral agent occurs in the exposure region 45a, and the wavelength of the reflected light changes accordingly.
Note that the exposure mask 46 is arranged at the same position as the right circularly polarized light reflection type color filter 49a, and the exposure area 45a is on the above-described exposure area 45. FIG. 16 schematically shows a patterning state similarly to FIG. 10, and an optical system including a plurality of lenses and the like exists between the exposure mask 46 and the reflective layer 44 as described above.

After removing the exposure mask 46, as shown in FIG. 15, is irradiated with light _{L 2} to the reflective layer 44a over the entire surface. Thereby, the cholesteric liquid crystal composition is polymerized and fixed, and the wavelength of reflected light in the reflective layer 44a is fixed. As shown in FIG. 16, the first region 47a and the second region 47 whose reflected light wavelengths are different from each other. A left circularly polarized light reflection type color filter 49b having 48a is obtained. The first region 47a is formed on the first region 47 of the right circular polarization reflection type color filter 49a, and the second region 48a is formed on the second region 48 of the right circular polarization reflection color filter 49a. Again, the light L ₁ and the light L ₂ is ultraviolet light, toward the light L ₂ is higher light intensity than the light L _2. In the step of FIG. 15, in order to promote polymerization immobilized by light L _2, it is preferably performed in a nitrogen atmosphere.
Thus, as shown in FIG. 16, the left circularly polarized light reflection type color filter 49b is laminated on the right circularly polarized light reflection type color filter 49a, whereby the reflection type color filter 32 can be obtained.
The reflection type color filter 32 can obtain various spectral characteristics with the same material by using an optical HTP (Helical Twisting Power) conversion technology, and develops a corresponding dye like an absorption type color filter. You can save time and effort.

In the multilayer color filter 14, the reflective color filter 32 is not limited to the configuration shown in FIG. 2, but may have the configuration shown in FIG. 17, for example. The reflection type color filter 50 shown in FIG. 17 has a plurality of second sections 52 and has four types of wavelength regions having different spectral characteristics. That is, the reflection type color filter 50 has the first wavelength region 34, the second wavelength region 35, the third wavelength region 53, and the fourth wavelength region 54 having different spectral characteristics.
In the reflection type color filter 50 of FIG. 17, the same components as those of the reflection type color filter 32 shown in FIG.

Similarly to the above-mentioned reflection type color filter 32, the reflection type color filter 50 is also laminated so that the first section 31 of the absorption type color filter 30 and the second section of the reflection type color filter 50 are matched.
The reflection type color filter 50 is selected without overlapping from four wavelength regions having different spectral characteristics, and has two sets of wavelength regions each composed of two wavelength regions. In FIG. 17, the two sets of wavelength regions include a first set composed of a first wavelength region 34 and a third wavelength region 53, and a second set of wavelength regions 35 and a fourth wavelength region 54. Two sets of the second set. One of the first set and the second set described above is arranged for each second section 52 of the reflective color filter 50.
In this case, the first wavelength region 34 is arranged at a position corresponding to the blue wavelength region 30B, and the third wavelength region 53 is arranged at a position corresponding to the green wavelength region 30G and the red wavelength region 30R. Further, the second wavelength region 35 is arranged at a position corresponding to the blue wavelength region 30B and the green wavelength region 30G, and the fourth wavelength region 54 is arranged at a position corresponding to the red wavelength region 30R.

  FIG. 18 shows the spectral characteristics of the first to fourth wavelength regions 34 to 54 of the reflective color filter 50. 18, the same components as those of the reflection type color filter 32 shown in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the reflection type color filter 50, the first wavelength region 34 has a spectral characteristic 34a. The first wavelength region 34 does not transmit a part of the light transmitted through the blue wavelength region 30B. The second wavelength region 35 has a spectral characteristic 35a. The second wavelength region 35 transmits a part of the light transmitted through the blue wavelength region 30B and the green wavelength region 30G, including a region where the light transmitted through the blue wavelength region 30B and the light transmitted through the green wavelength region 30G overlap. Does not transmit part of the light.
The third wavelength region 53 has a spectral characteristic 53a. The third wavelength region 53 transmits a part of the light transmitted through the green wavelength region 30G and the red wavelength region 30R, including a region where the light transmitted through the green wavelength region 30G and the light transmitted through the red wavelength region 30R overlap. Does not transmit part of the light.
The fourth wavelength region 54 has a spectral characteristic 54a. The fourth wavelength region 54 does not transmit light on the long wavelength side that is transmitted through the red wavelength region 30R more than the third wavelength region 53.

A reflective color filter 50 and the laminated color filter 14 with absorptive color filter 30 described above, as shown in FIG. 19, and two third green wavelength region 30G _3, the first blue wavelength region 30B ₁ If, one pixel region 31c is composed of the third red wavelength region 30R _3. Further, two second green wavelength region 30G _2, and second blue wavelength region 30B _2, 1 single pixel region 31d is formed in the fourth red wavelength region 30R _4. Thus, there are two types of pixel regions 31c and 31d.

Spectral characteristics of the pixel region 31c of the laminated color filter 14, as shown in FIG. 20, a first blue wavelength region 30B ₁ has a spectral characteristic 36B _1. The second blue wavelength region 30B ₂ has the spectral characteristics 36B _2. It found the following second blue wavelength region 30B _2, and transmits light having a shorter wavelength than the first blue wavelength region 30B _1.
Second green wavelength region 30G ₂ has a spectral characteristic 36G _2. The third green wavelength region 30G ₃ has the spectral characteristics 36G _3. Towards the third green wavelength region 30G ₃ is, to transmit light having a shorter wavelength than the second green wavelength region 30G _2.
The third red wavelength region 30R ₃ has the spectral characteristics 36R _3. Fourth red wavelength region 30R ₄ has the spectral characteristics 36R _4. It found the following fourth red wavelength region 30R _4, and transmits light of a shorter wavelength side than the third red wavelength region 30R _3.
Spectral characteristics of the pixel region 31d of the multilayer color filter 14, as shown in FIG. 20, a second blue wavelength region 30B ₂ has the spectral characteristics 36B _2. Second green wavelength region 30G ₂ has a spectral characteristic 36G _2. Fourth red wavelength region 30R ₄ has the spectral characteristics 36R _4.

  From the spectral characteristics shown in FIGS. 6 and 20, the multilayer color filter 14 is different in the red wavelength region, the green wavelength region, and the blue wavelength region, respectively, as compared with the three primary color filters of red, blue, and green. Light in the wavelength region can be transmitted. That is, multiple gradations can be obtained. The laminated color filter 14 has six gradations. Thereby, for example, a specific wavelength region can be detected in the blue wavelength region. In the green wavelength region, a specific wavelength region can be detected. In the red wavelength region, a specific wavelength region can be detected.

In the multilayer color filter 14, the reflective color filter 32 is not limited to the configuration shown in FIG. 2, but may have the configuration shown in FIG. 21, for example. The reflection type color filter 51 shown in FIG. 21 has a plurality of second sections 52, and has eight wavelength regions having different spectral characteristics.
In the reflection type color filter 51 of FIG. 21, the same components as those of the reflection type color filter 32 shown in FIG.
The reflection type color filter 51 shown in FIG. 21 also has the first section 31 of the absorption type color filter 30 and the second section 52 of the reflection type color filter 50 aligned in the same manner as the reflection type color filter 32 described above. Is done.
The reflection type color filter 51 is selected from eight wavelength regions having different spectral characteristics without overlapping, and has four sets of wavelength regions each composed of two wavelength regions.
FIG. 21 shows a first set including a first wavelength range 34 and a fifth wavelength range 55 as four sets of wavelength ranges. In this case, the first wavelength range 34 is a blue wavelength range 30B. , And the fifth wavelength region 55 is disposed at a position corresponding to the green wavelength region 30G and the red wavelength region 30R.
In addition, it has a second set composed of a second wavelength region 35 and a sixth wavelength region 56. In this case, the second wavelength region 35 is arranged at a position corresponding to the blue wavelength region 30B, The sixth wavelength region 56 is arranged at a position corresponding to the green wavelength region 30G and the red wavelength region 30R.
In addition, it has a third set composed of a third wavelength region 53 and a seventh wavelength region 57. In this case, the seventh wavelength region 57 is arranged at a position corresponding to the red wavelength region 30R, The seventh wavelength region 57 is arranged at a position corresponding to the blue wavelength region 30B and the green wavelength region 30G.
In addition, it has a fourth set composed of a fourth wavelength region 54 and an eighth wavelength region 58. In this case, the eighth wavelength region 58 is arranged at a position corresponding to the red wavelength region 30R, Eight wavelength regions 58 are arranged at positions corresponding to the blue wavelength region 30B and the green wavelength region 30G.

  FIGS. 22 and 23 show the spectral characteristics of the first to eighth wavelength regions 34 to 58 of the reflection type color filter 51. 22 and 23, the same components as those of the reflection type color filter 32 shown in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the reflection type color filter 51, as shown in FIG. 22, the first wavelength region 34 has a spectral characteristic 34a. The first wavelength region 34 does not transmit a part of the light transmitted through the blue wavelength region 30B. The third wavelength region 53 has a spectral characteristic 53a. The third wavelength region 53 includes a part of light transmitted through the blue wavelength region 30B and light transmitted through the green wavelength region 30G, including a region where light transmitted through the blue wavelength region 30B and light transmitted through the green wavelength region 30G overlap. And do not transmit part of the light.
The fifth wavelength region 55 has a spectral characteristic 55a. The fifth wavelength region 55 transmits a part of the light transmitted through the green wavelength region 30G and the red wavelength region 30R, including a region where the light transmitted through the green wavelength region 30G and the light transmitted through the red wavelength region 30R overlap. Does not transmit part of the light.
The seventh wavelength region 57 has a spectral characteristic 57a. The seventh wavelength region 57 does not transmit a part of the light transmitted through the red wavelength region 30R.

As shown in FIG. 23, the second wavelength region 35 has a spectral characteristic 35a. The second wavelength region 35 does not transmit light on the long wavelength side that transmits the blue wavelength region 30B than the first wavelength region 34.
The fourth wavelength region 54 has a spectral characteristic 54a. The fourth wavelength region 54 includes a part of light transmitted through the blue wavelength region 30B and light transmitted through the green wavelength region 30G, including a region where light transmitted through the blue wavelength region 30B and light transmitted through the green wavelength region 30G overlap. And do not transmit part of the light. The fourth wavelength region 54 does not transmit light on a longer wavelength side than the third wavelength region 53.
The sixth wavelength region 56 has a spectral characteristic 56a. The sixth wavelength region 56 transmits a part of the light transmitted through the green wavelength region 30G and the red wavelength region 30R, including a region where the light transmitted through the green wavelength region 30G and the light transmitted through the red wavelength region 30R overlap. Does not transmit part of the light. The sixth wavelength region 56 does not transmit light on a longer wavelength side than the fifth wavelength region 55.
The eighth wavelength region 58 has a spectral characteristic 58a. The eighth wavelength region 58 transmits a part of the light transmitted through the red wavelength region 30R. The eighth wavelength region 58 transmits light on a longer wavelength side than the seventh wavelength region 57.

A reflective color filter 51 and the multilayer color filter 14 with absorptive color filter 30 described above, as shown in FIG. 24, a green wavelength region 30G ₅ two fifth, first blue wavelength region 30B ₁ If, one pixel region 31e is composed of a red wavelength region 30R ₅ of the fifth. Further, two of the sixth green wavelength region 30G ₆ of a second blue wavelength region 30B _2, 1 single pixel area 31f is composed of a red wavelength region 30R ₆ sixth.
And two third green wavelength region 30G _3, and the third the blue wavelength region 30B _3, 1 single pixel area 31g is constituted by a red wavelength region 30R ₇ of the seventh. And two fourth green wavelength region 30G _4, the fourth blue wavelength region 30B _4, 1 single pixel area 31h is composed of a red wavelength region 30R ₈ of the eighth. Thus, it has four types of pixel regions 31e, 31f, 31g, and 31h.

Spectral characteristics of the pixel region 31e of the stacked color filter 14, as shown in FIG. 25, a first blue wavelength region 30B ₁ has a spectral characteristic 36B _1. Green wavelength region 30G ₅ of the fifth has a spectral characteristic 36G _5. Red wavelength region 30R ₅ of the fifth has a spectral characteristic 36R _5.
Spectral characteristics of the pixel region 31f of the laminated color filter 14, as shown in FIG. 26, a second blue wavelength region 30B ₂ has the spectral characteristics 36B _2. Green wavelength region 30G ₆ sixth having spectral characteristics 36G _6. Red wavelength region 30R ₆ of the sixth having spectral characteristics 36R _6.
Spectral characteristics of the pixel region 31g of the laminated color filter 14, as shown in FIG. 25, the third the blue wavelength region 30B ₃ has a spectral characteristic 36B _3. The third green wavelength region 30G ₃ has the spectral characteristics 36G _3. Red wavelength region 30R ₇ of the seventh having spectral characteristics 36R _7.
Spectral characteristics of the pixel region 31h of the multilayer color filter 14, as shown in FIG. 26, the fourth blue wavelength region 30B ₄ has a spectral characteristic 36B _4. Fourth green wavelength region 30G ₄ of having the spectral characteristics 36G _4. Red wavelength region 30R ₈ of the eighth having spectral characteristics 36R _8.

  From the spectral characteristics shown in FIGS. 6, 25, and 26, the multilayer color filter 14 has a red wavelength region, a green wavelength region, and a blue wavelength region as compared with the three primary color filters of red, blue, and green. , Light of different wavelength ranges can be transmitted. That is, multiple gradations can be obtained. The laminated color filter 14 has 12 gradations. Also in this case, the number of species of the multilayer color filter 14 is larger than the sum of the number of species in the wavelength region of the absorption color filter 30 and the number of species of the reflection color filter 51. Thereby, for example, a specific wavelength region can be detected in the blue wavelength region. In the green wavelength region, a specific wavelength region can be detected. In the red wavelength region, a specific wavelength region can be detected.

The optical sensor 10 shown in FIG. 1 uses the absorption color filters 30 of the three primary colors as described above, but is not limited to this, and detects infrared light as in the optical sensor 11 shown in FIG. It may be possible.
In the optical sensor 11 shown in FIG. 27, the same components as those of the optical sensor 10 shown in FIG.
FIG. 27 is a schematic cross-sectional view illustrating another configuration of the optical sensor having the color filter according to the embodiment of the present invention. FIG. 28 illustrates another configuration of the absorption type color filter of the color filter according to the embodiment of the present invention. FIG. 29 is a schematic diagram showing another configuration of the reflection type color filter of the color filter according to the embodiment of the present invention. FIG. 30 is a graph showing the spectral characteristics of the absorption type color filter of the color filter of the embodiment of the present invention, and FIG. 31 is a graph showing the spectral characteristics of the reflection type color filter of the color filter of the embodiment of the present invention.

The optical sensor 11 is different from the optical sensor 10 shown in FIG. 1 in that infrared light can be detected, and the photodiode 24 has sensitivity to infrared light. Further, the optical sensor 11 differs from the optical sensor 10 shown in FIG. 1 in the configuration of the absorption type color filter 30 and the configuration of the reflection type color filter 32.
As shown in FIG. 28, the absorption type color filter 30 has four strip-shaped first sections 31. In the first section 31, a blue wavelength region 30B, a green wavelength region 30G, a red wavelength region 30R, and an infrared wavelength region 30IR are arranged in this order. The infrared wavelength region 30IR has a spectral characteristic 33IR shown in FIG. In the infrared wavelength region 30IR, the light of the longer wavelength side than the red wavelength region 30R is transmitted without transmitting the light of the blue wavelength region 30B, the light of the green wavelength region 30G, and the light of the red wavelength region 30R. The infrared light transmitted through the infrared wavelength region 30IR reaches the photodiode 24 below the infrared wavelength region 30IR, and the photodiode 24 detects the infrared light. The optical sensor 11 can obtain a color image of three primary colors and an infrared light image.

  The infrared wavelength region 30IR can be configured with a visible light cut filter that cuts visible light and transmits near infrared light. The visible light cut filter contains a plurality of dyes for absorbing the entire visible light range. Near-infrared light is light having a wavelength of about 780 nm to 2000 nm. As described above, in order to realize the spectral characteristics of the blue wavelength region 30B, the green wavelength region 30G, and the red wavelength region 30R, it is necessary to use an infrared absorbing agent or an infrared absorbing layer in combination. In the region 30IR, since it is necessary to transmit infrared rays, an infrared absorber is contained only in the blue wavelength region 30B, the green wavelength region 30G, and the red wavelength region 30R, or the infrared absorbing layer is formed in the blue wavelength region 30B, the green wavelength region 30B. It is necessary to arrange so as to overlap only the region 30G and the red wavelength region 30R. When the infrared absorption layer is arranged so as to overlap only with the blue wavelength region 30B, the green wavelength region 30G, and the red wavelength region 30R, the infrared absorption layer is formed by any method so that the infrared absorption layer does not overlap with the infrared wavelength region 30IR. It is necessary to perform patterning, but it is preferable to install them at positions as close as possible in consideration of the effect of color mixture (crosstalk) between pixels due to oblique light. As the patterning method, in addition to techniques such as lithography and etching, wavelength conversion patterning using the photoreactive chiral agent used in the present invention can be used.

As shown in FIG. 29, the reflection type color filter 32 has ten wavelength regions from a first wavelength region 34 to a tenth wavelength region 60.
The first wavelength region 34 and the second wavelength region 35 are arranged at positions corresponding to the blue wavelength region 30B of the absorption type color filter 30.
The third wavelength region 53 and the fourth wavelength region 54 are disposed at positions overlapping and overlapping the blue wavelength region 30B and the green wavelength region 30G of the absorption type color filter 30.
The fifth wavelength region 55 and the sixth wavelength region 56 are arranged at positions overlapping and overlapping the green wavelength region 30G and the red wavelength region 30R of the absorption type color filter 30.
The seventh wavelength region 57 and the eighth wavelength region 58 are arranged at positions overlapping and overlapping the red wavelength region 30R and the infrared wavelength region 30IR of the absorption type color filter 30.
The ninth wavelength region 59 and the tenth wavelength region 60 are arranged at positions overlapping the blue wavelength region 30B of the absorption type color filter 30.

As shown in FIG. 31, the first wavelength region 34 has a spectral characteristic 34a. The first wavelength region 34 does not transmit a part of the light transmitted through the blue wavelength region 30B.
The third wavelength region 53 has a spectral characteristic 53a. The third wavelength region 53 transmits a part of the light transmitted through the blue wavelength region 30B and the green wavelength region 30G, including a region where the light transmitted through the blue wavelength region 30B and the light transmitted through the green wavelength region 30G overlap. Does not transmit part of the light.
The fifth wavelength region 55 has a spectral characteristic 55a. The fifth wavelength region 55 transmits a part of the light transmitted through the green wavelength region 30G and the red wavelength region 30R, including a region where the light transmitted through the green wavelength region 30G and the light transmitted through the red wavelength region 30R overlap. Does not transmit part of the light.
The seventh wavelength region 57 has a spectral characteristic 57a. The seventh wavelength region 57 does not transmit a part of the light transmitted through the red wavelength region 30R and a part of the light transmitted through the infrared wavelength region 30IR.
The ninth wavelength region 59 has a spectral characteristic 59a. The ninth wavelength region 59 does not transmit a part of the light transmitted through the infrared wavelength region 30IR.

As shown in FIG. 32, the second wavelength region 35 has a spectral characteristic 35a. The second wavelength region 35 does not transmit a part of the light transmitted through the blue wavelength region 30B.
The fourth wavelength region 54 has a spectral characteristic 54a. The fourth wavelength region 54 transmits a part of the light transmitted through the blue wavelength region 30B and the green wavelength region 30G, including a region where the light transmitted through the blue wavelength region 30B and the light transmitted through the green wavelength region 30G overlap. Does not transmit part of the light.
The sixth wavelength region 56 has a spectral characteristic 56a. The sixth wavelength region 56 transmits a part of the light transmitted through the green wavelength region 30G and the red wavelength region 30R, including a region where the light transmitted through the green wavelength region 30G and the light transmitted through the red wavelength region 30R overlap. Does not transmit part of the light.
The eighth wavelength region 58 has a spectral characteristic 58a. The eighth wavelength region 58 does not transmit a part of the light transmitted through the red wavelength region 30R and a part of the light transmitted through the infrared wavelength region 30IR.
The tenth wavelength region 60 has a spectral characteristic 60a. The tenth wavelength region 60 does not transmit a part of the light transmitted through the infrared wavelength region 30IR.

Laminated color filter 14 with an absorption-type color filter 30 described above and the reflective color filter 32, as shown in FIG. 33, the first blue wavelength region 30B 1 _~ fourth blue wavelength region 30B ₄ 1 one of the pixel region 37a is formed, one pixel region 37b in the blue wavelength region 30B ₆ of the third blue wavelength region 30B ₃ ~ 6 are configured, the red wavelength region of the fifth red wavelength region 30R ₅ ~ 8 one pixel region 37c at 30R ₈ is formed, one pixel region 37d in the infrared wavelength region 30IR ₁₀ of the seventh infrared wavelength region 30IR7~ tenth is constructed.

As shown in FIG. 34, a first blue wavelength region 30B ₁ of the laminated color filter 14 has a spectral characteristic 36B _1. Third blue wavelength region 30B ₃ has a spectral characteristic 36B _3. The third green wavelength region 30G ₃ has the spectral characteristics 36G _3. Green wavelength region 30G ₅ of the fifth has a spectral characteristic 36G _5. Red wavelength region 30R ₅ of the fifth has a spectral characteristic 36R _5. Red wavelength region 30R ₇ of the seventh having spectral characteristics 36R _7.
Infrared wavelength region 30IR ₇ of the seventh having spectral characteristics 36IR _7. Infrared wavelength region 30IR ₉ of the ninth having spectral characteristics 36IR _9.

As shown in FIG. 35, a second blue wavelength region 30B ₂ of the laminated color filter 14 has a spectral characteristic 36B _2. Fourth blue wavelength region 30B ₄ has a spectral characteristic 36B _4. Fourth green wavelength region 30G ₄ of having the spectral characteristics 36G _4. Green wavelength region 30G ₆ sixth having spectral characteristics 36G _6. Red wavelength region 30R ₆ of the sixth having spectral characteristics 36R _6. Red wavelength region 30R ₈ of the eighth having spectral characteristics 36R _8.
Infrared wavelength region 30IR ₈ of the eighth having spectral characteristics 36IR _8. Infrared wavelength region 30IR ₁₀ of the 10 have a spectral characteristic 36IR _10.

  From the spectral characteristics shown in FIGS. 30, 34, and 35, the multilayer color filter 14 has a red wavelength region, a blue wavelength region, a red wavelength region, a blue wavelength region, and a red wavelength region. Light of different wavelength ranges can be transmitted for the green wavelength region and the infrared wavelength region. That is, multiple gradations can be obtained. The color filter 14 has 16 gradations. Also in this case, the number of species of the multilayer color filter 14 is larger than the sum of the number of species in the wavelength region of the absorption color filter 30 and the number of species of the reflection color filter 32. Thereby, for example, a specific wavelength region can be detected in the blue wavelength region. In the green wavelength region, a specific wavelength region can be detected. In the red wavelength region, a specific wavelength region can be detected. Even in the infrared wavelength region, a specific wavelength region can be detected.

  Each of the above-mentioned reflective color filters has a single layer, but the present invention is not limited to this, and a plurality of layers may be used. For example, the reflection type color filter 50 shown in FIG. 17 is composed of a first reflection type filter 50a shown in FIG. 36 and a second reflection type filter 50b shown in FIG. 37, and the first reflection type filter 50a And the second reflection type filter 50b may be laminated. For example, the first reflection type filter 50a has right circular polarization reflection characteristics, and the second reflection type filter 50b has left circular polarization reflection characteristics.

The first reflective filter 50a of FIG. 36 has the second wavelength region 35 and the third wavelength region 53 of the reflective color filter 50 shown in FIG. 17, and has a plurality of wavelength regions. In this case, the first reflection filter 50a has a plurality of second sections 62, and the second wavelength area 35 or the third wavelength area 53 is arranged for each of the second sections 62.
The second reflection type filter 50b shown in FIG. 37 has the first wavelength region 34 and the fourth wavelength region 54 of the reflection type color filter 50 shown in FIG. Also in this case, the second reflection filter 50b has a plurality of second sections 64, and the first wavelength region 34 or the fourth wavelength region 54 is arranged for each of the second sections 64. .
The first reflective filter 50a and the second reflective filter 50b are stacked so that the second partition 62 of the first reflective filter 50a and the second partition 64 of the second reflective filter 50b match. By doing so, the configuration becomes the same as that of the reflection type color filter 50 shown in FIG.
When the first reflection type filter 50a and the second reflection type filter 50b are used, since the first reflection type filter 50a and the second reflection type filter 50b have a small number of species in the wavelength region, they can be manufactured. Can be reduced, and the manufacturing process can be simplified.

  The present invention is basically configured as described above. As described above, the color filter, the kit, the method for manufacturing the color filter, and the optical sensor of the present invention have been described in detail. However, the present invention is not limited to the above-described embodiment, and various improvements may be made without departing from the gist of the present invention. Or it may be changed.

  Hereinafter, the present invention will be described in more detail with reference to Examples. Materials, usage amounts, ratios, processing contents, processing procedures, and the like shown in the following examples can be appropriately changed without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the following examples.

[Production of reflective color filter]
In order to confirm whether or not the spectral characteristics described in the present invention can be realized, a reflection type color filter was formed on a glass substrate, and the spectrum was evaluated. For the measurement of the spectrum, a spectrophotometer UV-3100PC manufactured by Shimadzu Corporation was used.

<Preparation of coating liquid (R1)>
A compound (9), a compound (11), a photoreactive right-handed chiral agent 1, a fluorine-based horizontal alignment agent 1, a polymerization initiator, a polymerization inhibitor, and a solvent are mixed, and a coating solution (R1 ) Was prepared. Compound (9) and compound (11) correspond to the exemplified compounds described above, and X ¹ of compound (11) is 2.
-Compound (9) 80 parts by mass-Compound (11) 20 parts by mass-The following photoreactive right-handed chiral agent 1 5.4 parts by mass-The following fluorine-based horizontal alignment agent 1 0.1 parts by mass-Polymerization initiator 4 parts by mass of IRGACURE 819 (manufactured by BASF) • 1 part by mass of polymerization inhibitor IRGANOX1010 (manufactured by BASF) • solvent (cyclohexanone) The amount at which the solute concentration becomes 40% by mass

<Preparation of coating liquid (R2)>
A coating solution (L2) was prepared with the same composition except that the photoreactive right-handed chiral agent 1 in the preparation of the coating solution R1 was changed to the following photoreactive left-handed chiral agent 1.

<Preparation of glass substrate with photo-alignment film (P1)>
With reference to JP 2012-155308 A, the description of Example 3, a coating liquid 1 for a photo-alignment film was prepared. The prepared coating solution 1 for a photo-alignment film was applied on a glass substrate by a spin coating method to form a film 1 for forming a photo-alignment film. The obtained photo-alignment film forming film 1 is irradiated with polarized ultraviolet light (using a 300 mJ / cm ² , 750 W ultra-high pressure mercury lamp) through a wire grid polarizer to form a glass substrate P 1 with a photo-alignment film. did.

<Preparation of reflection type color filter (RCF1)>
The coating liquid R1 was spin-coated on the glass substrate P1 with a photo-alignment film to form a coating film having a thickness of 5 μm. After heating the glass substrate P1 with the photo-alignment film on which the coating film is disposed on a hot plate at 80 ° C. for 1 minute to dry and remove the solvent and form a cholesteric alignment state, using EXECURE 3000-W manufactured by HOYA-SCHOTT T. Then, UV (ultraviolet) light with an illuminance of 30 mW / cm ² was irradiated for 10 seconds through a photomask at room temperature under a nitrogen atmosphere to fix the orientation of the region F1. Next, the photomask is removed, and UV light having an illuminance of ² mW / cm ² is irradiated under air for 50 seconds (100 mJ / cm ² ), and then the film is heated on a hot plate at 80 ° C. for 1 minute to be fixed. After converting the reflection wavelength of the non-existing portion to the longer wavelength side, UV light having an illuminance of 30 mW / cm ² is again irradiated for 10 seconds through a photomask at room temperature under a nitrogen atmosphere, and the region F2 different from the region F1 is irradiated. The orientation was fixed. Next, the photomask is removed, and UV light with an illuminance of ² mW / cm ² is irradiated under air for 50 seconds (100 mJ / cm ² ), and then the film is heated on a hot plate at 80 ° C. for 1 minute to be fixed. After converting the reflection wavelength of the non-existing portion to the longer wavelength side, UV light having an illuminance of 30 mW / cm ² is irradiated again through a photomask at room temperature under a nitrogen atmosphere for 10 seconds, and is different from the regions F1 and F2. The orientation of the region F3 was fixed. Next, the photomask is removed, and UV light with an illuminance of ² mW / cm ² is irradiated under air for 50 seconds (100 mJ / cm ² ), and then the film is heated on a hot plate at 80 ° C. for 1 minute to be fixed. After converting the reflection wavelength of the non-existing portion to the longer wavelength side, UV light having an illuminance of 30 mW / cm ² was again irradiated for 10 seconds at room temperature under a nitrogen atmosphere, and a region F4 different from the regions F1, F2 and F3 was obtained. The reflection type color filter RCF1 was manufactured by fixing the orientation of the color filter. Region F1, the area F2, the dose for the spectral transform in the area F3, and area F4, respectively ^{0mJ / cm 2, 100mJ / cm} 2, 200mJ / cm 2 and 300 mJ / cm ^2, and the reflection at the respective portions centered Wavelengths were 426 nm, 496 nm, 572 nm, and 640 nm.

<Preparation of reflective color filter (LCF1)>
A reflective color filter LCF1 was produced in the same manner except that the coating liquid in the production process of the reflective color filter RCF1 was changed to L1. The central reflection wavelength in each of the regions F1, F2, F3, and F4 was 426 nm, 496 nm, 572 nm, and 640 nm.
<Preparation of a multilayer reflective color filter (RLCF1)>
A laminated reflective color filter RLCF1 was produced in the same manner except that the substrate in the production process of the reflective color filter LCF1 was changed to the reflective color filter RCF1 produced above. At the time of exposure through the photomask, the positions of the regions F1, F2, F3, and F4 of the RCF1 and the regions F1, F2, F3, and F4 of the LCF1 overlap each other. After alignment, exposure was performed. The central reflection wavelengths in the respective regions F1, F2, F3, and F4 of the laminate were 426 nm, 496 nm, 572 nm, and 640 nm.

<Lamination with absorption color filter>
The spectrum was measured by stacking the multilayer reflective color filter RLCF1 and the three primary color filters of red (R), green (G) and blue (B) used for the absorption color filter. The spectrum in the region F1 of the multilayer reflective color filter RLCF1 cuts the short wavelength side in the blue wavelength region, the spectrum in the region F2 cuts the long wavelength side in the blue wavelength region and the short wavelength side in the green wavelength region, and the region F3 It can be seen that the spectrum in the area can cut the long wavelength side in the green wavelength region and the short wavelength side in the red wavelength area, and the spectrum in the area F4 can cut the long wavelength side in the red wavelength area. That is, by superimposing a specific wavelength region of the multilayer reflective color filter RLCF1 and the absorption RGB color filter, a multilayer color filter having spectral characteristics divided into six wavelength regions can be realized.

  By using the manufacturing method of the present invention, a red filter (R), a green filter (G), and a blue filter (B) are formed on an image sensor array by a known method, and a microlens and a flattening layer are further formed. The photo-alignment film and the laminated reflection type color filter were formed on the layered structure, and the above-mentioned regions F1, F2, F3, and F4 and the respective regions of the RGB color filters were formed as shown in FIG. 3 and FIG. The optical sensor according to the present invention can be manufactured by forming as shown, and further laminating a known near-infrared cut layer that blocks a wavelength region of 650 to 1200 nm.

DESCRIPTION OF SYMBOLS 10, 11 Optical sensor 12 Sensor part 14 Color filter 20 Substrate 22 Wiring layer 24 Photodiode 25 Insulating film 26 Shielding film 28 Microlens 29 Flattening layer 30 Absorption type color filter 30B Blue wavelength region 30B _1st blue wavelength region 30B ₂ second blue wavelength region 30B ₃ third blue wavelength region 30B ₄ fourth blue wavelength region 30B ₆ sixth blue wavelength region 30G green wavelength region 30G ₁ first green wavelength region 30G ₂ second green wavelength Area 30G ₃ Third green wavelength area 30G ₄ Fourth green wavelength area 30G ₅ Fifth green wavelength area 30G ₆ Sixth green wavelength area 30IR Infrared wavelength area 30IR ₇ Seventh infrared wavelength area 30IR _8th 8 infrared wavelength region 30IR ₉ ninth infrared wavelength region 30IR ₁₀ 10th infrared wavelength region 30R red wavelength region 30R _1st first Red wavelength region 30R ₂ second red wavelength region 30R ₃ third red wavelength region 30R ₄ fourth red wavelength region 30R ₅ fifth red wavelength region 30R ₆ sixth red wavelength region 30R ₇ seventh red Wavelength region 30R ₈ eighth red wavelength region 31 first section 31a, 31b, 31c, 31d, 31e, 31f, 31g, 31h pixel area 32 reflective color filter 32a second section 33B, 33G, 33IR, 33R spectral characteristics 34 first wavelength region 34a, 35a spectral characteristics 35 second wavelength region _{36B 1, 36B 2, 36B 3} , 36B 4 spectral characteristics _{36G 1, 36G 2, 36G 3} , 36G 4, 36G 5, 36G 6 spectral characteristics _{36IR 7, 36IR 8, 36IR 9} , 36IR 10 spectral characteristics _{36R 1, 36R 2, 36R 3} , 36R 4, 36R 5 _{36R 6,} 36R 7, 36R ₈ spectral characteristics 37a, 37b, 37c, 37d pixel region 40 substrate 42 underlying layer 44 reflective layer 45,45a exposed regions 46 exposed mask 47,47a first region 48,48a second region 49a Right circularly polarized light reflective color filter 49b Left circularly polarized light reflective color filter 50, 51 Reflective color filter 50a First reflective filter 50b Second reflective filter 53 Third wavelength region 53a, 54a, 55a, 56a, 57a, 58a, 59a, 60a Spectral characteristics 54 Fourth wavelength region 55 Fifth wavelength region 56 Sixth wavelength region 57 Seventh wavelength region 58 Eighth wavelength region 59 Ninth wavelength region 60 Tenth wavelength compartment L ₁ of the region 62 and 64 the 2, _{L 2} light

Claims (15)

At least one absorption color filter;
At least one reflective color filter,
The absorption type color filter and the reflection type color filter are laminated,
When the genus of the wavelength region of the absorption type color filter is m, the genus of the wavelength region of the reflection type color filter is n, and the genus of the wavelength region of the multilayer color filter is p, the absorption type color The m wavelength regions of the filter and the n wavelength regions of the reflection type color filter are superimposed in different combinations, and p> m ≧ 2, p> n ≧ 2, and p> m + n. Characteristic laminated color filter.   The multilayer color filter according to claim 1, wherein the reflective color filter has a circularly polarized light reflection characteristic.   The multilayer color filter according to claim 1, further comprising at least one reflective color filter having a right circularly polarized light reflection characteristic and at least one reflective color filter having a left circularly polarized light reflection characteristic.   The multilayer color filter according to any one of claims 1 to 3, wherein the reflective color filter is obtained by curing a polymerizable cholesteric liquid crystal composition.   The multilayer color filter according to claim 4, wherein the polymerizable cholesteric liquid crystal composition contains at least one or more polymerizable liquid crystal compounds and at least one or more photoreactive chiral agents. The multilayer color filter according to claim 5, wherein the photoreactive chiral agent is represented by the following general formulas (1) to (5).
In the formula, A ₁₁ and A ₁₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₁₁ —, and Ar ₁₁ represents an aromatic carbon ring which may have a substituent or R ₁₁ and R ₁₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or an aromatic carbon ring which may have a substituent; Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₁₂ and R ₁₄ each independently represent a hydrogen atom or a C _{1 to} C ₁₂ of an alkyl _{group, B 11} and _{B 12} each independently -C is _{(= O) - (Ar 12} ) n 11 - , or _{-C (= O) -Ar 13 -N} = X 11 -Ar 14 - a represents , _{X 11} represents N or CH, _{Ar 12} Ar ₁₃ and Ar ₁₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₁₁ represents an integer of 0 to 2, When n ₁₁ is 2, a plurality of Ar ₁₂ may be the same or different, and Z ₁₁ and Z ₁₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₁₁ and Z ₁₂ may have a polymerizable group. Z ₁₁ and R ₁₂ and Z ₁₂ and R ₁₄ may form a ring with each other, and Z ₁₁ and Z ₁₂ of a plurality of molecules may be polymerized via a covalent bond.
In the formula, A ₂₁ and A ₂₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₂₁ —, and Ar ₂₁ represents an aromatic carbon ring which may have a substituent or Represents an aromatic heterocyclic ring which may have a substituent, wherein R ₂₁ and R ₂₃ each independently represent a hydrogen atom, an alkyl group of C _{1 to} C ₁₂ , or an aromatic carbon ring which may have a substituent Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₂₂ and R ₂₄ are each independently a hydrogen atom or a C _{1 to} C ₁₂ represents an alkyl _{group, B 21} and _{B 22} are each independently _{-C (= O) - (Ar} 22) n 21 - , or _{-C (= O) -Ar 23 -N} = X 21 -Ar 24 - a represents , _{X 21} represents N or CH, _{Ar 22} Ar ₂₃ and Ar ₂₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₂₁ represents an integer of 0 to 2, When n ₂₁ is 2, a plurality of Ar ₂₂ may be the same or different, and Z ₂₁ and Z ₂₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₂₁ and Z ₂₂ may have a polymerizable group. Z ₂₁ and R ₂₂ and Z ₂₂ and R ₂₄ may form a ring with each other, and a plurality of molecules of Z ₂₁ and Z ₂₂ may be polymerized via a covalent bond.
In the formula, A ₃₁ and A ₃₂ each independently represent a single bond, —OC (＝ O) — or —OC (＝ O) —Ar ₃₁ —, wherein Ar ₃₁ has a substituent. R ₃₁ and R ₃₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or a substituent. And an optionally substituted aromatic carbocycle, an optionally substituted aromatic heterocycle, a cyano group, or a C ₁ -C ₁₂ alkyloxycarbonyl group, wherein R ₃₂ and R ₃₄ each independently represent hydrogen. represents an alkyl group of atoms or _C 1 _{~C 12, B 31} and _{B 32} represents a single bond _{independently, -C (= O) - (} Ar 32) n 31 - , or -C (= O) _{-Ar 33} - N represents X ₃₁ —Ar ₃₄ —, and X ₃₁ represents N or Represents CH, Ar ₃₂ , Ar ₃₃ and Ar ₃₄ each independently represent an aromatic carbon ring which may have a substituent or an aromatic heterocyclic ring which may have a substituent, and n ₃₁ represents Represents an integer of 0 to 2, and when n ₃₁ is 2, a plurality of Ar ₃₂ may be the same or different; Z ₃₁ and Z ₃₂ each independently represent a hydrogen atom, an alkyl group of C _{1 to} C ₁₂ , alkoxy groups of ₁ -C _12, alkyl carbonyl group of C 1 _{-C 12,} alkyl amino group of C 1 _{-C 12,} or an alkyl amide group of the _C 1 ~C _{12, Z 31} and _{Z 32} are, It may have a polymerizable group, Z ₃₁ and R ₃₂ and Z ₃₂ and R ₃₄ may form a ring with each other, or a plurality of molecules of Z ₃₁ and Z ₃₂ may be polymerized via a covalent bond. Well, L is divalent It represents a group. The binaphthyl moiety has either (R) or (S) axial asymmetry.
In the formula, A ₄₁ and A ₄₂ each independently represent —C (＝ O) — or —C (＝ O) —Ar ₄₁ —, and Ar ₄₁ represents an aromatic carbon ring which may have a substituent or Represents an aromatic heterocyclic ring which may have a substituent, wherein R ₄₁ and R ₄₃ each independently represent a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, or an aromatic carbon ring which may have a substituent; Represents an aromatic heterocyclic ring which may have a substituent, a cyano group, or a C _{1 to} C ₁₂ alkyloxycarbonyl group, wherein R ₄₂ and R ₄₄ are each independently a hydrogen atom or a C _{1 to} C ₁₂ represents an alkyl _{group, B 41} and _{B 42} are each independently _{-C (= O) - (Ar} 42) n 41 - , or _{-C (= O) -Ar 43 -N} = X 41 -Ar 44 - a represents , _{X 41} represents N or CH, _{Ar 42} Ar ₄₃ and Ar ₄₄ represents an aromatic heterocycle optionally having independently an aromatic carbocyclic ring which may have a substituent or substituents, n ₄₁ represents an integer of 0 to 2, When n ₄₁ is 2, a plurality of Ar ₄₂ may be the same or different, and Z ₄₁ and Z ₄₂ are each independently a hydrogen atom, a C _{1 to} C ₁₂ alkyl group, a C _{1 to} C ₁₂ alkoxy group, Represents a C _{1 to} C ₁₂ alkylcarbonyloxy group, a C _{1 to} C ₁₂ alkylamino group, or a C _{1 to} C ₁₂ alkylamide group, and Z ₄₁ and Z ₄₂ may have a polymerizable group. Z ₄₁ and R ₄₂ and Z ₄₂ and R ₄₄ may form a ring with each other, a plurality of molecules Z ₄₁ and Z ₄₂ may be polymerized through a covalent bond, and R ₄₅ and R ₄₆ C ₁ -C ₃₀ And may form a ring with each other. * Represents an asymmetric carbon.
Wherein, P ₅₁ represents a polymerizable group, Sp ₅₁ represents an alkylene group of a single bond or C ₁ ~ _12, plurality of carbon atoms may be replaced by an oxygen atom or a carbonyl group, X ₅₁ represents a single bond Or an oxygen atom; Ar ₅₁ and Ar ₅₂ each independently represent an aromatic carbon ring which may have a substituent or an aromatic heterocyclic ring which may have a substituent; and L ₅₁ is a single bond Or n represents a divalent linking group, n ₅₁ represents an integer of 1 to 3, and when n ₅₁ is 2 or more, a plurality of Ar ₅₁ and L ₅₁ may be the same or different from each other, and R ₅₂ is asymmetric. Represents a side chain containing carbon.   The polymerizable cholesteric liquid crystal composition is cured, and has a photo-alignment film in contact with a reflection type color filter having right circular polarization reflection characteristics or a reflection type color filter having left circular polarization reflection characteristics. 7. The laminated color filter according to any one of the above items 6. The multilayer color filter according to claim 5 , wherein the refractive index anisotropy Δn of the polymerizable liquid crystal compound is 0.2 or more.   The multilayer color filter according to any one of claims 1 to 8, further comprising a near-infrared cut layer that blocks a part or the whole of the near-infrared region. A method for producing a laminated color filter comprising at least one absorption color filter and at least one reflection color filter, wherein the absorption color filter and the reflection color filter are laminated.
When the genus of the wavelength region of the absorption type color filter is m, the genus of the wavelength region of the reflection type color filter is n, and the genus of the wavelength region of the multilayer color filter is p, the absorption type color M kinds of wavelength regions of the filter and n kinds of wavelength regions of the reflection type color filter are superimposed in different combinations, and p> m ≧ 2, p> n ≧ 2, and p> m + n,
Forming a liquid crystal composition layer by applying a polymerizable liquid crystal composition containing a photoreactive chiral agent on the underlayer,
By patterning regions having different spectral characteristics on the liquid crystal composition layer by exposure, photoisomerization of the photoreactive chiral agent is caused, and the reflection wavelength of the region having different spectral characteristics is converted to convert the reflection type color. A method for producing a laminated color filter, comprising forming a filter. The step of forming the reflective color filter,
Right circularly polarized light reflection layer forming step of forming a right circularly polarized light reflection layer having a plurality of wavelength regions in the plane, and
The method for producing a multilayer color filter according to claim 10 , comprising a left circularly polarized light reflection layer forming step of forming a left circularly polarized light reflection layer having a plurality of wavelength regions in a plane. The right circularly polarized light reflecting layer forming step,
A coating step of coating a polymerizable liquid crystal composition comprising at least one polymerizable liquid crystal compound, a photoreactive chiral agent having right-handed properties and a polymerization initiator;
Heating the polymerizable liquid crystal composition applied in the application step, an alignment step to a cholesteric alignment state,
By performing an exposure treatment on a part of the polymerizable liquid crystal composition in the cholesteric alignment state in the alignment step, a conversion step of converting a reflection wavelength region of the exposed part, and
By performing an exposure treatment on the entire surface of the polymerizable liquid crystal composition in which a part of the alignment state is converted in the conversion step, including a fixing step of fixing the alignment state of the polymerizable liquid crystal composition,
The left circularly polarized light reflecting layer forming step,
A coating step of coating a polymerizable liquid crystal composition comprising at least one polymerizable liquid crystal compound, a photoreactive chiral agent having left-handed properties and a polymerization initiator;
Heating the polymerizable liquid crystal composition applied in the application step, an alignment step to a cholesteric alignment state,
By performing an exposure treatment on a part of the polymerizable liquid crystal composition in the cholesteric alignment state in the alignment step, a conversion step of converting a reflection wavelength region of the exposed part, and
The multilayer color filter according to claim 11 , further comprising a fixing step of fixing a cholesteric alignment state by performing an exposure treatment on the entire surface of the polymerizable liquid crystal composition having partially changed the alignment state in the conversion step. Manufacturing method. The right circularly polarized light reflecting layer forming step,
A coating step of coating a polymerizable liquid crystal composition comprising at least one polymerizable liquid crystal compound, a photoreactive chiral agent having right-handed properties and a polymerization initiator;
Heating the polymerizable liquid crystal composition applied in the application step, an alignment step to a cholesteric alignment state,
A first fixing step of fixing the cholesteric alignment state of the exposed portion by performing an exposure treatment on a part of the polymerizable liquid crystal composition in the cholesteric alignment state;
A conversion step of converting a reflection wavelength region of the exposed portion by performing an exposure process on the unexposed portion in the first fixing step, and
A second fixing step of fixing the alignment state of the polymerizable liquid crystal composition by performing an exposure process on the polymerizable liquid crystal composition whose alignment state has been changed in the conversion step,
The left circularly polarized light reflecting layer forming step,
A coating step of coating a polymerizable liquid crystal composition comprising at least one polymerizable liquid crystal compound, a photoreactive chiral agent having left-handed properties and a polymerization initiator;
Heating the polymerizable liquid crystal composition applied in the application step, an alignment step to a cholesteric alignment state,
A first fixing step of fixing the cholesteric alignment state of the exposed portion by performing an exposure treatment on a part of the polymerizable liquid crystal composition in the cholesteric alignment state;
A conversion step of converting a reflection wavelength region of the exposed portion by performing an exposure process on the unexposed portion in the first fixing step, and
The lamination according to claim 11 , further comprising a second fixing step of fixing an alignment state of the polymerizable liquid crystal composition by performing an exposure process on the polymerizable liquid crystal composition whose alignment state has been changed in the conversion step. Method of manufacturing a color filter. Before the right circularly polarized light reflecting layer forming step or the left circularly polarized light reflecting layer forming step, an alignment layer coating step of coating a photo alignment film, and the coated photo alignment film is exposed to polarized light. The method for producing a multilayer color filter according to any one of claims 11 to 13 , further comprising an alignment control step of giving an alignment control force by performing an alignment control process.   An optical sensor comprising the multilayer color filter according to claim 1.