JP2001318227A - Polyimide resin for optical part, and optical part using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polyimide resin for optical parts, which is transparent with respect to light of 400-1,000 nm wavelength, is able to have a large birefringence and is inexpensive and an optical retardation plate and a wavelength plate using the same, which is satisfactory in light transmittance in the 400-1,000 nm wavelength region and has large birefringence. SOLUTION: The polyimide resin for the optical parts comprises a polyimide resin, containing a recurring unit expressed by general formula (1) (in the formula, R represents a tetravalent organic group, each of R1 and R2 represents a monovalent organic group and R1 and R2 may be identical or different with each other), is used with a light source of 400-1,000 nm wavelength region and is used for the optical retardation plate and the wavelength plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyimide resin for an optical component used for a phase difference plate, a wavelength plate, and the like, and an optical component using the same.

[0002]

2. Description of the Related Art In recent years, the development of information transmission and information storage using light as a medium, such as optical wiring, optical communication, optical storage devices, and optical disk media, has been remarkable. The use of light is
When transmitting information over a relatively long distance using light having a relatively long wavelength of 00 nm or more, and when transmitting information over a relatively short distance using light having a relatively short wavelength of 900 nm or less, such as an optical storage device, there is a large difference. Divided.

An optical storage device in a device for transmitting light having a relatively short wavelength of 900 nm or less includes a light receiving device, a writing device, and the like, and the medium of the optical storage device is a compact disk (CD) or a CD-ROM. , Mini disk (MD), video disk, video CD, CD-R
(Write-once type), CD-RW (rewriteable type), DVD, DV
There are various types such as D-RAM, DVD-R, MO, PD, and other optical disks. These media, for example, write information by irradiating the recording medium with a certain coherent light, or pick up reflected light by irradiating light that is weaker than writing, and perform reading. In such a case, there is a problem that a phase difference occurs and reading accuracy and writing accuracy are remarkably reduced. Therefore, a quarter-wave plate or the like is used to remove a noise component having a phase difference, and a crystal or the like has been used so far.

A quartz wave plate can be obtained by cutting a crystal, which is a uniaxial crystal, in a plane parallel to the crystal axis. However, since the wave plate itself is expensive and relatively heavy, the cost of peripheral parts is high. is there. Further, there is a problem that it is difficult to stably supply a quartz wave plate, and there is a high possibility that it will not be possible to follow explosive optical information transmission and optical information storage devices expected in the future. Furthermore, quartz is fragile and may be broken during the manufacturing process of a part, resulting in a problem of lowering the yield.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to
An object of the present invention is to provide an inexpensive polyimide resin for an optical component that is transparent to light having a wavelength of 0 to 1000 nm, can increase birefringence by being oriented, and is inexpensive.

The object of the present invention is to provide
An object of the present invention is to provide an inexpensive optical component having good light transmittance in a wavelength region of m, a high phase difference, a high heat resistance, and a high heat resistance.

[0007] Another object of the present invention is to provide a light source device having a wavelength of 400 nm
An object of the present invention is to provide an inexpensive retardation plate having good light transmittance in a wavelength region of 0 nm, large birefringence, high heat resistance and low cost.

[0008] Another object of the present invention is to provide a semiconductor device having a wavelength of 400 nm
It is an object of the present invention to provide a thin-film and inexpensive wavelength plate that has good light transmittance in a wavelength region of 0 nm, can easily control a phase difference depending on the film thickness and the degree of orientation, and is thin.

[0009]

As a result of various studies on the polyimide resin, the present inventors have found that a polyimide resin containing a repeating unit having a specific structure is particularly preferably 400 to 100.
The inventors have found that the light transmittance is high in a relatively short wavelength region of 0 nm and a high phase difference can be obtained, and based on this finding, the present invention has been completed.

The present invention provides a compound represented by the general formula (1):

[0011]

Embedded image (Wherein, R represents a tetravalent organic group, R ¹ and R ² represents a monovalent organic group, R ¹ and R ² may be different from be the same.) In The present invention relates to a polyimide resin for an optical component, which is made of a polyimide resin containing the repeating unit shown and is used in a light source in a wavelength region of 400 to 1000 nm.

The present invention also provides a compound of the general formula (2)

[0013]

Embedded image (Wherein R ¹ and R ² represent a monovalent organic group, and R ¹ and R ²
May be the same or different, and R ³
And R ⁴ represents from 1 to 3 hydrogen or a monovalent organic group, R ³
And R ⁴ may be the same or different. The present invention relates to a polyimide resin for an optical component which is made of a polyimide resin containing a repeating unit represented by the formula (1) and is used in a light source in a wavelength region of 400 to 1000 nm.

The present invention also relates to an optical component comprising the above-mentioned polyimide resin and used as a light source in a wavelength region of 400 to 1000 nm.

The present invention also relates to an optical component having optical anisotropy, which is used in a light source having a wavelength region of 400 to 1000 nm and made of the polyimide resin.

The present invention also relates to a retardation plate used for a light source having a wavelength region of 400 to 1000 nm, comprising the above-mentioned polyimide resin.

The present invention also relates to a wavelength plate made of the above-mentioned polyimide resin and used in a light source in a wavelength region of 400 to 1000 nm.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Molecules of a polyimide resin containing a repeating unit represented by the general formula (1) or (2) are relatively easy to have a planar structure, and thus are easily oriented between molecules. Therefore, when formed into a film or a structure, birefringence occurs due to strong refractive index anisotropy. In particular, when the composition is applied and cured on the substrate, it is easily oriented with respect to the surface of the substrate, so that a large birefringence can be obtained when a laser beam or the like is passed through the application surface in a guided mode. Furthermore, this polyimide resin is 400
Light transmittance is high in the wavelength region of light up to 1000 nm.

When the film formed on the substrate is peeled off from the substrate or when the entire substrate is stretched, the molecules in the film tend to be oriented in the stretching direction. When it transmits light, it functions as a phase difference plate. At this time, various wavelength plates can be obtained by adjusting the thickness and the stretching ratio of the film.

Further, the wavelength plate made of a polyimide resin can increase the phase difference per the same film thickness as compared with that of a quartz crystal, so that the parts can be made thin. In addition, since the polyimide resin itself is light, the burden on peripheral parts and operating parts can be reduced. Is also greatly reduced. The fact that the burden on peripheral components and the operating section can be greatly reduced also has the advantage that cost reduction can be expected for them, and that not only the wave plate itself but also components and devices can be manufactured at low cost.

The retardation plate of the present invention can be obtained by obtaining a film of the polyimide resin for optical parts of the present invention.

As a method for obtaining a film, a method of applying a solution of the polyimide resin for an optical component of the present invention, drying, curing if necessary, and stretching, and a method of coating, drying and stretching. If necessary, there is a method of curing.

As a material to be applied, a polyimide precursor solution having a structure represented by the general formula (1) or (2),
There is a polyimide resin solution.

As a coating method, inorganic materials such as glass and quartz, semiconductors and metal materials such as silicon, gallium-arsenide, aluminum, titanium, copper, silver and stainless steel, and organic materials such as polyester, polypropylene, polyimide and polyamideimide are used. There are spin coating, cast coating, and roll coating on the base material.

As a method for drying, the solvent is volatilized by heating to a temperature in the range of room temperature to about 200 ° C. in a state where the film is held on the substrate, but when the film is stretched after drying, the film can be stretched when the amount of the solvent in the film becomes extremely small. It is preferable that the drying temperature is not so high because it disappears.

Examples of the stretching method include uniaxial stretching, sequential biaxial stretching, simultaneous biaxial stretching, and uniaxial fixed uniaxial stretching.
Uniaxial fixing and uniaxial stretching are preferred because more uniform surfaces can be obtained more efficiently. In this case, the film may be stretched by heating.

Curing is usually performed at 250 to 400 ° C. to obtain a polyimide resin.

As for the polyimide resin film, there is no problem depending on the use conditions even if the polyimide precursor film is dried only.

The polyimide resin for optical parts containing a repeating unit represented by the general formula (1) or (2) according to the present invention comprises tetracarboxylic dianhydride and 2,2'-organic group-substituted-4. Obtained by copolymerization with a diamine containing 4,4'-diaminobiphenyl.

The content of the repeating unit represented by the general formula (1) or (2) is most preferably 100% by weight in the polyimide resin. Is obtained. It is preferably at least 20% by weight. The tetracarboxylic dianhydride and the diamine may be used as a mixture of two or more.

R is preferably a tetravalent organic group having 1 to 30 carbon atoms, and more preferably a tetravalent organic group having an aromatic ring having 6 to 30 carbon atoms. R ¹ and R ² are preferably a monovalent organic group having 1 to 30 carbon atoms, and more preferably an alkyl group having 1 to 4 carbon atoms. R ³ and R ⁴ are preferably hydrogen or a monovalent organic group having 1 to 30 carbon atoms, more preferably hydrogen or an alkyl group having 1 to 4 carbon atoms.

The polyimide resin for an optical component of the present invention includes a polyimide resin (including a polyimide resin precursor),
Examples thereof include polyimide / isoindoloquinazolinedione imide resin, polyether imide resin, and polyamide imide resin.

The polyimide precursor solution is N-methyl-
2-pyrrolidone, N, N-dimethylacetamide, γ-
It is obtained by the reaction of tetracarboxylic dianhydride with a diamine containing 2,2'-organic group-substituted-4,4'-diaminobiphenyl in a polar solvent such as butyrolactone or dimethyl sulfoxide.

Examples of tetracarboxylic dianhydrides include:
3,3 ', 4,4'-biphenyltetracarboxylic dianhydride, pyromellitic dianhydride, 2,3,3', 4'-
Biphenyltetracarboxylic dianhydride, 2,2 ', 3
3'-biphenyltetracarboxylic dianhydride, 3,
3 ', 4,4'-benzophenonetetracarboxylic dianhydride, 2,2', 3,3'-benzophenonetetracarboxylic dianhydride, 2,2-bis (3,4-dicarboxyphenyl) propane dianhydride Anhydride, 2,2-bis (2,3-
Dicarboxyphenyl) propane dianhydride, 1,1-bis (3,4-dicarboxyphenyl) ethane dianhydride,
1,1-bis (2,3-dicarboxyphenyl) ethane dianhydride, bis (3,4-dicarboxyphenyl) methane dianhydride, bis (2,3-dicarboxyphenyl) methane dianhydride, bis (3,4-dicarboxyphenyl)
Sulfone dianhydride, bis (3,4-dicarboxyphenyl) ether dianhydride, bis (2-methyl-3,4-dicarboxyphenyl) ether dianhydride, bis (2.5
-Dimethyl-3,4-dicarboxyphenyl) ether dianhydride, bis (2,5-diethyl-3,4-dicarboxyphenyl) ether dianhydride, bis (2,5-diethoxy-3,4-di (Carboxyphenyl) ether dianhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, 2,2-bis (4- (4-aminophenoxy) phenyl) propane, 1,2,5,6 -Naphthalenetetracarboxylic dianhydride, 2,3,6,7-naphthalenetetracarboxylic dianhydride, 2,3,5,6-pyridinetetracarboxylic dianhydride, 3,4,9,10-perylene Tetracarboxylic dianhydride, 3,3 ', 4,4'-
Tetraphenylsilanetetracarboxylic dianhydride, 2,
2-bis (3,4-dicarboxyphenyl) hexafluoropropane dianhydride, p-terphenyl-3,3 ',
4,4'-tetracarboxylic dianhydride, 4,4'-diphthalic dianhydride, (trifluoromethyl) pyromellitic dianhydride, di (trifluoromethyl) pyromellitic dianhydride, di ( Heptafluoropropyl) pyromellitic dianhydride, pentafluoroethyl pyromellitic dianhydride, bis {3,5-di (trifluoromethyl) phenoxy} pyromellitic dianhydride, 2,2-bis (4 4
-Dicarboxyphenyl) hexafluoropropane dianhydride, 5,5'-bis (trifluoromethyl) -3,
3 ', 4,4'-tetracarboxybiphenyl dianhydride, 2,2', 5,5'-tetrakis (trifluoromethyl) -3,3 ', 4,4'-tetracarboxybiphenyl dianhydride, , 5'-bis (trifluoromethyl)
-3,3 ', 4,4'-tetracarboxybiphenyl ether dianhydride, 5,5'-bis (trifluoromethyl) -3,3', 4,4'-tetracarboxybenzophenone dianhydride, bis ｛ (Trifluoromethyl) dicarboxyphenoxy benzene dianhydride, bis {(trifluoromethyl) dicarboxyphenoxy} (trifluoromethyl) benzene dianhydride, bis (dicarboxyphenoxy) (trifluoromethyl) benzene dianhydride Bis (dicarboxyphenoxy) bis (trifluoromethyl) benzene dianhydride, bis (dicarboxyphenoxy) tetrakis (trifluoromethyl) benzene dianhydride, 2,2-bis {4- (3,4-dicarboxy) Phenyl) phenyl {hexafluoropropane dianhydride, bis} (trifluoromethyl ) Dicarboxyphenoxy dibiphenyl dianhydride, bis (trifluoromethyl) dicarboxyphenoxy bis (trifluoromethyl) biphenyl dianhydride, bis (trifluoromethyl) dicarboxyphenoxy diphenyl ether dianhydride, bis ( Known tetracarboxylic dianhydrides such as dicarboxyphenoxy) bis (trifluoromethyl) biphenyl dianhydride may be mentioned, and two or more kinds may be used in combination. Preferably, 3,3 ', 4,4'-biphenyltetracarboxylic dianhydride is used. To obtain a polyamide-imide resin, trimellitic anhydride chloride or the like is used.

As the 2,2'-organic group-substituted-4,4'-diaminobiphenyl, 2,2'-dimethyl-4,4 '
-Diaminobiphenyl, 2,2'-diethyl-4,4 '
-Diaminobiphenyl and the like are preferably used. Other diamines used in combination include, for example, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenylsulfone,
4'-diaminodiphenyl sulfide, benzine, m
-Phenylenediamine, p-phenylenediamine, 1,
5-naphthalenediamine, 2,6-naphthalenediamine, bis (4-aminophenoxyphenyl) sulfone,
Bis (3-aminophenoxyphenyl) sulfone, bis (4-aminophenoxy) biphenyl, bis [4- (4
-Aminophenoxy) phenyl] ether, 1,4-bis (4-aminophenoxy) benzene, 3,3'-dimethyl-4,4'-diaminobiphenyl, 3,3'-diethyl-4,4'-diaminobiphenyl , 2, 2 ', 3,
3'-tetramethyl-4,4'-diaminobiphenyl,
2,2 ', 3,3'-tetraethyl-4,4'-diaminobiphenyl, 2,2'-dimethoxy-4,4'-diaminobiphenyl, 3,3'-dimethoxy-4,4'-diaminobiphenyl, 2,2'-dihydroxy-4,4 '
-Diaminobiphenyl, 3,3'-dihydroxy-4,
4'-diaminobiphenyl, 2,2'-di (trifluoromethyl) -4,4'-diaminobiphenyl, 4- (1
H, 1H, 11H-eicosafluoroundecyloxy) -1,3-diaminobenzene, 4- (1H, 1H-
Perfluoro-1-butyloxy) -1,3-diaminobenzene, 4- (1H, 1H-perfluoro-1-heptyloxy) -1,3-diaminobenzene, 4- (1
H, 1H-perfluoro-1-octyloxy) -1,
3-diaminobenzene, 4-pentafluorophenoxy-1,3-diaminobenzene, 4- (2,3,5,6-
Tetrafluorophenoxy) -1,3-diaminobenzene, 4- (4-fluorophenoxy) -1,3-diaminobenzene, 4- (1H, 1H, 2H, 2H-perfluoro-1-hexanoxy) -1,3 -Diaminobenzene, 4- (1H, 1H, 2H, 2H-perfluoro-1
-Dodecyloxy) -1,3-diaminobenzene, 2,
5-diaminobenzotrifluorofluoride, bis (trifluoromethyl) phenylenediamine, diaminotetra (trifluoromethyl) benzene, diamino (pentafluoroethyl) benzene, 2,5-diamino (perfluorohexyl) benzene, 2,5- Diamino (perfluorobutyl) benzene, 2,2'-bis (trifluoromethyl) -4,4'-diaminobiphenyl, 3,3'-
Bis (trifluoromethyl) -4,4'-diaminobiphenyl, octafluorobenzidine, 4,4'-diaminophenyl ether, 2,2'-bis (p-aminophenyl) hexafluoropropane, 1,3-bis ( Anilino) hexafluoropropane, 1,4-bis (anilino) octafluorobutane, 1,5-bis (anilino)
Decafluoropentane, 1,7-bis (anilino) tetradecafluoroheptane, 2,2'-bis (trifluoromethyl) -4,4'-diaminodiphenyl ether,
3,3'-bis (trifluoromethyl) -4,4'-diaminodiphenyl ether, 3,3 ', 5,5'-tetrakis (trifluoromethyl) -4,4'-diaminodiphenyl ether, 3,3'- Bis (trifluoromethyl) -4,4'-diaminobenzophenone, 4,4'-
Diamino-p-terphenyl, 1,4, -bis (p-aminophenylbenzene, p-bis (4-amino-2-trifluoromethylphenoxy) benzene, bis (aminophenoxy) bis (trifluoromethyl) benzene, Bis (aminophenoxy) tetrakis (trifluoromethyl) benzene, 2,2'-bis {4- (4-aminophenoxy) phenyl} hexafluoropropane, 2,2 '
-Bis {4- (3-aminophenoxy) phenyl} hexafluoropropane, 2,2'-bis {4- (2-aminophenoxy) phenyl} hexafluoropropane,
2,2'-bis {4- (4-aminophenoxy) 3,5
-Dimethylphenyl @ hexafluoropropane, 4,
4'-bis (4-amino-2-trifluoromethylphenoxy) biphenyl, 4,4'-bis (4-amino-3
-Trifluoromethylphenoxy) biphenyl, 4,
4'-bis (4-amino-2-trifluoromethylphenoxy) diphenylsulfone, 4,4'-bis (3-amino-5-trifluoromethylphenoxy) diphenylsulfone, 2,2'-bis {4- ( 4-amino-3-trifluoromethylphenoxy) phenyl {hexafluoropropane, bis [{(trifluoromethyl) aminophenoxy} phenyl] hexafluoropropane, bis {(trifluoromethyl) aminophenoxy} biphenyl, bis [2-} Aromatic diamine compounds such as (aminophenoxy) phenyl {hexafluoropropyl] benzene are used in combination as needed. The compound to be combined may be an aromatic diamine compound having a bond between two or more aromatic rings having an ether group, a methylene group, or a carbonyl group, but is preferably an aromatic diamine compound having a biphenyl structure in the structure.

[0036]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.

Example 1 2,2'-dimethyl-4,4'-diaminobiphenyl 2
After dissolving 25 g in 1731 g of N, N-dimethylacetamide, 294.2 g of 3,3 ', 4,4'-biphenyltetracarboxylic dianhydride was added and stirred at room temperature for 20 hours to obtain a polyimide precursor solution. I got As the substrate, a 6-inch silicon wafer coated with ₂ μm of SiO ₂ was used. The above-mentioned polyimide precursor solution was dropped thereon, spin-coated (1400 rpm / 30 seconds), and then subjected to an oven (100 ° C./30 minutes) to form a polyamic acid film. The film was peeled off and uniaxially fixed uniaxial stretching was performed with a biaxial stretching device manufactured by Toyo Seiki Seisaku-sho. The stretching ratio at this time was 20%. The stretched film is taken out, the stretching direction is fixed with a jig, and 200 ° C./1 hour + 35
Curing at 0 ° C. for 1 hour was performed in a clean oven manufactured by Toyo Seiki. The thickness of this film after curing was 17 μm.

The 50% transmission wavelength of this film is 440n.
m. The retardation at the center of the film was about 800 nm. This film is 6
It turned out to function as a 5 / 4λ wave plate at a wavelength of 33 nm.

When the transmittance of the film was measured, it was 90% at a wavelength of 600 nm.

Example 2 2,2'-dimethyl-4,4'-diaminobiphenyl 2
After dissolving 25 g in 1731 g of N, N-dimethylacetamide, 294.2 g of 3,3 ', 4,4'-biphenyltetracarboxylic dianhydride was added and stirred at room temperature for 20 hours to obtain a polyimide precursor solution. I got As the substrate, a 6-inch silicon wafer coated with ₂ μm of SiO ₂ was used. The polyimide precursor solution was dropped thereon and spin-coated (1400 rpm / 30 seconds), and then oven (100 ° C./30 minutes + 200 ° C./3)
(0 minute + 350 ° C./1 hour) to form a polyimide film. This film was peeled off and stretched while heating to 250 ° C. with a tensile tester. The stretching ratio at this time was 5%.
The stretched film was taken out and the film thickness was measured.
μm.

The 50% transmission wavelength of this film is 440n.
m. The phase difference at the center of the film was measured to be about 320 nm. This film is 6
It turned out to function as a 1 / 2λ wavelength plate at a wavelength of 33 nm.

Example 3 2,2'-dimethyl-4,4'-diaminobiphenyl 2
After dissolving 25 g in 3200 g of N, N-dimethylacetamide, 147.1 g of 3,3 ', 4,4'-biphenyltetracarboxylic dianhydride and 109 g of pyromellitic dianhydride were added, and the mixture was added at room temperature for 20 hours. By stirring, a polyimide precursor solution was obtained.

The polyimide precursor solution obtained here was 188
It was applied to a μm polyester film using a comma coater. After drying the film, it was stretched 15% uniaxially. Thereafter, the composition was cured at 350 ° C., and the phase difference was measured to be about 790 nm. This film was found to function as a ／ wavelength plate at 633 nm wavelength light.
The transmittance of this film at a wavelength of 633 nm was as good as 85%.

Example 4 2,2'-Dimethyl-4,4'-diaminobiphenyl 1
12 g and 53 g of 1,4-diaminophenylene were added to N, N-
After dissolving in 2000 g of dimethylacetamide,
147.1 g of 3 ', 4,4'-biphenyltetracarboxylic dianhydride and 109 g of pyromellitic dianhydride were added and stirred at room temperature for 20 hours to obtain a polyimide precursor solution.

The polyimide precursor solution obtained here was cast applied with a gap of 300 μm, and 100
The film was dried by heating at 150 ° C. for 15 minutes to obtain a film. This film is simultaneously stretched 3% uniaxially and 10% uniaxially,
While the temperature was increased from 5 ° C. to 350 ° C. at a rate of 5 ° C./min, the composition was heated and cured on a hot plate. When the retardation at the center of the film was measured with light having a wavelength of 633 nm, it was 200 nm.
Met. The transmittance of this film at a wavelength of 633 nm was as good as 90%.

[0046]

According to the present invention, 400 nm to 1000 n
Thus, a polyimide resin for an optical component having excellent light transmittance in a relatively short wavelength region of m and an optical component using the same can be obtained.

Further, according to the present invention, 400 nm to 100 nm
It is possible to obtain a polymer retardation plate having excellent light transmittance in a relatively short wavelength region of 0 nm. Further, since the phase difference can be easily controlled by the degree of the film thickness and the degree of orientation, a lightweight, thin and inexpensive wave plate can be easily obtained.

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Claims (6)

[Claims] 1. A compound of the general formula (1) (Wherein, R represents a tetravalent organic group, R ¹ and R ² represents a monovalent organic group, R ¹ and R ² may be different from be the same.) In A polyimide resin for an optical component, which is made of a polyimide resin containing the indicated repeating unit and is used in a light source in a wavelength region of 400 to 1000 nm. 2. A compound of the general formula (2) (Wherein R ¹ and R ² represent a monovalent organic group, and R ¹ and R ²
May be the same or different, and R ³
And R ⁴ represents from 1 to 3 hydrogen or a monovalent organic group, R ³
And R ⁴ may be the same or different. A) a polyimide resin containing a repeating unit represented by the formula (1) and used for a light source in a wavelength region of 400 to 1000 nm. 3. An optical component comprising the polyimide resin according to claim 1 and used in a light source in a wavelength region of 400 to 1000 nm. 4. An optical component comprising the polyimide resin according to claim 1 and having an optical anisotropy used in a light source in a wavelength region of 400 to 1000 nm. 5. A retardation plate comprising the polyimide resin according to claim 1 and used in a light source in a wavelength region of 400 to 1000 nm. 6. A wave plate made of the polyimide resin according to claim 1 and used in a light source in a wavelength region of 400 to 1000 nm.