TECHNICAL FIELD
[0001]
The present invention relates to an optical component.
10 BACKGROUND ART
[0002]
A cyclic olefin-based copolymer has excellent optical
performance and is therefore used , for example, as an optical
component such as an optical lens.
15 Examples of the technique relating to the cyclic olefin-based
copolymer used for the optical component include that described in
Patent Document 1 (Japanese Unexamined Patent Publication No.
2015-199939).
[0003]
20 Patent Document 1 discloses a cyclic olefin-based resin
composition including a cyclic olefin-based copolymer and a
diglycerin fatty acid ester. Patent Document 1 describes that a
molded product having excellent optical performance and suppressing
deterioration of optical performance under high temperature and high
25 humidity conditions can be obtained in a case where such a cyclic
olefin-based resin composition is used.
2
RELATED DOCUMENT
PATENT DOCUMENT
[0004]
[Patent Document 1] Japanese Unexamined Patent Publication No.
5 2015-199939
SUMMARY OF THE INVENTION
TECHNICAL PROBLEM
[0005]
10 In recent years, there has been an increasing demand for an
in-vehicle camera lens and a camera lens for a mobile device (a mobile
phone, a smartphone, a tablet, or the like). High heat resistance
is required for the in-vehicle camera lens and the camera lens for
a mobile device. The cyclic olefin-based copolymer is widely used
15 in an optical component such as a camera lens because of its excellent
optical properties and mechanical properties.
However, according to the studies by the present inventors, it
has been found that an optical component including a cyclic
olefin-based copolymer may undergo a change in refractive index and
20 therefore deterioration of optical performance upon exposure to a
high temperature environment for a long period of time.
[0006]
The present invention has been made in view of the above
circumstances, and provides an optical component having a high
25 refractive index and excellent long-term reliability of optical
performance in a high temperature environment.
SOLUTION TO PROBLEM
3
[0007]
According to the present invention, an optical component shown
below is provided.
[0008]
5 [1]
An optical component including a cyclic olefin-based copolymer
(A),
in which the cyclic olefin-based copolymer (A) has
a constitutional unit (a) derived from at least one olefin
10 represented by the following general formula (I),
a constitutional unit (b) derived from at least one cyclic olefin
represented by the following general formula (II), and
a constitutional unit (c) derived from at least one cyclic olefin
represented by the following general formula (III), and
15 a content of the constitutional unit (a) is equal to or less
than 50 mol% in a case where a total content of the constitutional
unit (a), the constitutional unit (b), and the constitutional unit
(c) is taken as 100 mol%.
[Chem. 1]
20
(In the above general formula (I), R300 represents a hydrogen
atom or a linear or branched hydrocarbon group having 1 to 29 carbon
4
atoms.)
[Chem. 2]
(In the above general formula (II), R1 to R8 are each
5 independently a hydrogen atom, a halogen atom, or a hydrocarbon group
having equal to or less than 4 carbon atoms, R5 to R8 may be bonded
to each other to form a monocyclic ring, the monocyclic ring may have
a double bond, and R5 and R6 or R7 and R8 may form an alkylidene group.)
[Chem. 3]
10
(In the above general formula (III), n is 0 or 1, m is 0 or a
positive integer, n + m is a positive integer, q is 0 or 1, R1 to
R18 and Ra and Rb are each independently a hydrogen atom, a halogen
atom, or a hydrocarbon group, R15 to R18 may be bonded to each other
15 to form a monocyclic or polycyclic ring, the monocyclic or polycyclic
ring may have a double bond, and R15 and R16 or R17 and R18 may form
5
an alkylidene group.)
[2]
The optical component according to [1],
in which a glass transition point (Tg) of the cyclic olefin-based
5 copolymer (A) measured by DSC is equal to or higher than 140°C.
[3]
The optical component according to [1] or [2],
in which a ratio ((b)/(c)) of a content of the constitutional
unit (b) to a content of the constitutional unit (c) in the cyclic
10 olefin-based copolymer (A) is equal to or more than 2.
[4]
The optical component according to any one of [1] to [3],
in which the constitutional unit (b) in the cyclic olefin-based
copolymer (A) includes a repeating unit derived from
15 bicyclo[2.2.1]-2-heptene, and the constitutional unit (c) in the
cyclic olefin-based copolymer (A) includes a repeating unit derived
from tetracyclo[4.4.0.12,5.17,10]-3-dodecene.
[5]
The optical component according to any one of [1] to [4],
20 in which the constitutional unit (a) in the cyclic olefin-based
copolymer (A) includes a repeating unit derived from ethylene.
[6]
The optical component according to any one of [1] to [5],
in which the optical component is an fθ lens, an image pickup
25 lens, a sensor lens, a prism, or a light guide plate.
[7]
The optical component according to any one of [1] to [6],
6
in which the optical component is an in-vehicle camera lens or
a camera lens for a mobile device.
ADVANTAGEOUS EFFECTS OF INVENTION
5 [0009]
According to the present invention, it is possible to provide
an optical component having a high refractive index and excellent
long-term reliability of optical performance in a high temperature
environment.
10
DESCRIPTION OF EMBODIMENTS
[0010]
Hereinafter, the present invention will be described based on
the embodiments. In the present embodiment, "A to B" indicating a
15 numerical range represent equal to or more than A and equal to or
less than B unless otherwise specified.
[0011]
[Optical component]
First, an optical component of the embodiment according to the
20 present invention will be described.
The optical component according to the present embodiment is
an optical component including a cyclic olefin-based copolymer (A),
in which the cyclic olefin-based copolymer (A) has a constitutional
unit (a) derived from at least one olefin represented by the following
25 general formula (I), a constitutional unit (b) derived from at least
one cyclic olefin represented by the following general formula (II),
and a constitutional unit (c) derived from at least one cyclic olefin
7
represented by the following general formula (III), and the content
of the constitutional unit (a) is equal to or less than 50 mol% in
a case where the total content of the constitutional unit (a), the
constitutional unit (b), and the constitutional unit (c) is taken
5 as 100 mol%.
[0012]
[Chem. 4]
(In the above general formula (I), R300 represents a hydrogen
10 atom or a linear or branched hydrocarbon group having 1 to 29 carbon
atoms.)
[0013]
[Chem. 5]
15 (In the above general formula (II), R1 to R8 are each
independently a hydrogen atom, a halogen atom, or a hydrocarbon group
having equal to or less than 4 carbon atoms, R5 to R8 may be bonded
8
to each other to form a monocyclic ring, the monocyclic ring may have
a double bond, and R5 and R6 or R7 and R8 may form an alkylidene group.)
[0014]
[Chem. 6]
5
(In the above general formula (III), n is 0 or 1, m is 0 or a
positive integer, n + m is a positive integer, q is 0 or 1, R1 to
R18 and Ra and Rb are each independently a hydrogen atom, a halogen
atom, or a hydrocarbon group, R15 to R18 may be bonded to each other
10 to form a monocyclic or polycyclic ring, the monocyclic or polycyclic
ring may have a double bond, and R15 and R16 or R17 and R18 may form
an alkylidene group.)
[0015]
According to the studies by the present inventors, it has been
15 found that an optical component including a cyclic olefin-based
copolymer undergoes a change in refractive index and therefore
deterioration of optical performance upon exposure to a high
temperature environment for a long period of time.
The present inventors have conducted extensive studies to solve
20 the above problem. As a result, it has been found that an optical
component using the cyclic olefin-based copolymer (A) having the
9
constitutional unit (a) derived from at least one olefin represented
by the above general formula (I), the constitutional unit (b) derived
from at least one cyclic olefin represented by the above general
formula (II), and the constitutional unit (c) derived from at least
5 one cyclic olefin represented by the above general formula (III),
and having a content of the constitutional unit (a) of equal to or
less than 50 mol% has a high refractive index, is unlikely to have
a decrease in the refractive index even upon exposure to a high
temperature environment for a long period of time, and is excellent
10 in long-term reliability of optical performance.
[0016]
That is, according to the present embodiment, it is possible
to realize an optical component having a high refractive index and
excellent long-term reliability of optical performance in a high
15 temperature environment.
[0017]
The lower limit of the content of the cyclic olefin-based
copolymer (A) in the optical component according to the present
embodiment is preferably equal to or more than 50% by mass, more
20 preferably equal to or more than 70% by mass, still more preferably
equal to or more than 80% by mass, even still more preferably equal
to or more than 90% by mass, and particularly preferably equal to
or more than 95% by mass in a case where the entire optical component
is taken as 100% by mass. In a case where the content of the cyclic
25 olefin-based copolymer (A) in the optical component according to the
present embodiment is equal to or more than the above lower limit
value, the optical performance can be further improved.
10
The upper limit of the content of the cyclic olefin-based
copolymer (A) in the optical component according to the present
embodiment is not particularly limited and is, for example, equal
to or less than 100% by mass.
5 [0018]
The optical component according to the present embodiment
includes the cyclic olefin-based copolymer (A) and therefore has
excellent optical performance. Therefore, the optical component
according to the present embodiment can be suitably used as an optical
10 component in an optical system that needs to identify an image with
high accuracy. The optical component is a component used in optical
system equipment or the like, and specific examples of the optical
component include a sensor lens which is a lens used for various
sensors, a pickup lens, a projector lens, a prism, an fθ lens, an
15 image pickup lens, and a light guide plate. From the viewpoint of
the effect according to the present embodiment, the optical component
according to the present embodiment can be suitably used for an fθ
lens, an image pickup lens, a sensor lens, a prism, or a light guide
plate.
20 In particular, an optical component including the cyclic
olefin-based copolymer (A) having a glass transition point in a range
of equal to or higher than 140°C satisfies moist heat resistance while
having high heat resistance.
Therefore, the optical component including the cyclic
25 olefin-based copolymer (A) having a glass transition point in a range
of equal to or higher than 140°C can be particularly suitably used
for an optical component that requires heat resistance, such as an
11
in-vehicle camera lens or a camera lens for a mobile device (a mobile
phone, a smartphone, a tablet, or the like). Examples of the
in-vehicle camera lens and the camera lens for a mobile device include
a view camera lens, a sensing camera lens, a lens for light convergence
5 of a head-up display, and a lens for light diffusion of a head-up
display.
[0019]
The optical component according to the present embodiment may
be combined with a second optical component which is different from
10 the above optical component.
The second optical component is not particularly limited, and
for example, an optical component composed of at least one resin
selected from a polycarbonate resin and a polyester resin can be used.
[0020]
15 Hereinafter, each component will be specifically described.
[0021]
(Cyclic olefin-based copolymer (A))
The cyclic olefin-based copolymer (A) has the constitutional
unit (a) derived from at least one olefin represented by the above
20 general formula (I), the constitutional unit (b) derived from at least
one cyclic olefin represented by the above general formula (II), and
the constitutional unit (c) derived from at least one cyclic olefin
represented by the above general formula (III).
[0022]
25
In the above general formula (I), R300 represents a hydrogen atom
or a linear or branched hydrocarbon group having 1 to 29 carbon atoms.
12
Examples of the olefin monomer for forming the constitutional unit
(a) include ethylene, propylene, 1-butene, 1-pentene, 1-hexene,
3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene,
4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene,
5 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene,
1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene,
1-octadecene, and 1-eicosene. Among these olefin monomers, ethylene
or propylene is preferable, and ethylene is particularly preferable,
from the viewpoint of obtaining an optical component having better
10 heat resistance, mechanical properties, and optical properties. As
the olefin monomer for forming the constitutional unit (a), one type
of olefin monomer may be used alone, or two or more types of olefin
monomers may be used in combination.
[0023]
15 In the cyclic olefin-based copolymer (A) according to the
present embodiment, in a case where the total content of the
constitutional unit (a), the constitutional unit (b), and the
constitutional unit (c) is taken as 100 mol%, the content of the
constitutional unit (a) is equal to or less than 50 mol%, preferably
20 equal to or less than 49 mol%, and more preferably equal to or less
than 48 mol%, and preferably equal to or more than 35 mol% and more
preferably equal to or more than 40 mol%, from the viewpoint of
improving the heat resistance of the optical component.
The content of the constitutional unit (a) can be measured by
25 13C-NMR.
[0024]

13
In the above general formula (II), R1 to R8 are each independently
a hydrogen atom, a halogen atom, or a hydrocarbon group having equal
to or less than 4 carbon atoms. Here, the halogen atom is a fluorine
atom, a chlorine atom, a bromine atom, or an iodine atom.
5 Examples of the hydrocarbon group having equal to or less than
4 carbon atoms include an alkyl group such as a methyl group, an ethyl
group, a propyl group, an isopropyl group, an n-butyl group, or an
isobutyl group, and a cycloalkyl group such as a cyclopropyl group.
In addition, R5 to R8 may be bonded to each other to form a
10 monocyclic ring, the monocyclic ring may have a double bond, and R5
and R6 or R7 and R8 may form an alkylidene group.
The monocyclic rings formed here are exemplified below.
[0025]
[Chem. 7]
15
[0026]
In the above monocyclic rings, the carbon atom numbered 1 or
2 is a carbon atom forming an alicyclic structure to which R5 (R6)
or R7 (R8) is bonded in the general formula (II).
20 In addition, specific examples of the alkylidene group include
an ethylidene group, a propylidene group, and an isopropylidene
group.
[0027]
14
Examples of the cyclic olefin monomer for forming the
constitutional unit (b) include bicyclo[2.2.1]-2-heptene (also
referred to as norbornene), a bicyclo[2.2.1]hept-2-ene derivative
having equal to or less than 11 carbon atoms, a
5 tricyclo[4.3.0.12,5]-3-decene derivative, and
tricyclo[4.4.0.12,5]-3-undecene. Among these cyclic olefin monomers,
bicyclo[2.2.1]-2-heptene is preferable.
As the cyclic olefin monomer for forming the constitutional unit
(b), one type of cyclic olefin monomer may be used alone, or two or
10 more types of cyclic olefin monomers may be used in combination.
[0028]
In the cyclic olefin-based copolymer (A) according to the
present embodiment, in a case where the total content of the
constitutional unit (a), the constitutional unit (b), and the
15 constitutional unit (c) is taken as 100 mol%, the content of the
constitutional unit (b) is preferably equal to or more than 25 mol%
and equal to or less than 64 mol%, more preferably equal to or more
than 30 mol% and equal to or less than 60 mol%, still more preferably
equal to or more than 35 mol% and equal to or less than 55 mol%, and
20 particularly preferably equal to or more than 40 mol% and equal to
or less than 55 mol%, from the viewpoint of improving the balance
among long-term reliability of optical performance in a high
temperature environment, refractive index, and heat resistance.
The content of the constitutional unit (b) can be measured by
25 13C-NMR.
[0029]

15
In the above general formula (III), n is 0 or 1, m is 0 or a
positive integer, n + m is a positive integer, and q is 0 or 1. In
a case where q is 1, Ra and Rb each independently represent the
following atom or hydrocarbon group, and in a case where q is 0, the
5 respective bonding sites are bonded to each other to form a 5-membered
ring.
In addition, in the above general formula (III), R1 to R18 and
Ra and Rb are each independently a hydrogen atom, a halogen atom, or
a hydrocarbon group. Here, the halogen atom is the same as the halogen
10 atom in the above general formula (II).
[0030]
In addition, examples of the hydrocarbon group include, usually,
an alkyl group having 1 to 20 carbon atoms and a cycloalkyl group
having 3 to 15 carbon atoms, respectively. More specifically,
15 examples of the alkyl group include a methyl group, an ethyl group,
a propyl group, an isopropyl group, an amyl group, a hexyl group,
an octyl group, a decyl group, a dodecyl group, and an octadecyl group,
and examples of the cycloalkyl group include a cyclohexyl group.
These groups may be each substituted with a halogen atom.
20 [0031]
Further, in the above general formula (III), R15 and R16, R17 and
R18, R15 and R17, R16 and R18, R15 and R18, or R16 and R17 each may be bonded
to each other (or each may cooperate with each other) to form a
monocyclic or polycyclic ring, and the monocyclic or polycyclic ring
25 thus formed may have a double bond.
The monocyclic or polycyclic rings formed here are exemplified
below.
16
[0032]
[Chem. 8]
[0033]
5 In the above exemplification, the carbon atom numbered 1 or 2
is a carbon atom forming an alicyclic structure to which R15 (R16) or
R17 (R18) is bonded in the general formula (III).
[0034]
In addition, R15 and R16 or R17 and R18 may form an alkylidene group.
10 Examples of such an alkylidene group usually include an alkylidene
group having 2 to 20 carbon atoms, specific examples of which include
an ethylidene group, a propylidene group, and an isopropylidene
group.
[0035]
15 Examples of the cyclic olefin monomer for forming the
constitutional unit (c) include
tetracyclo[4.4.0.12,5.17,10]-3-dodecene (also referred to as
tetracyclododecene), a tricyclo[4.3.0.12,5]-3-decene derivative
having equal to or more than 12 carbon atoms, a
20 tricyclo[4.3.0.12,5]-3-undecene derivative, a
tetracyclo[4.4.0.12,5.17,10]-3-dodecene derivative, a
17
pentacyclo[6.6.1.13,6.02, 7.09,14]-4-hexadecene derivative, a
pentacyclo[8.4.0.12,3.19,12.08,13]-3-hexadecene derivative, a
pentacyclo[6.5.1.13,6.02,7.09,13]-4-pentadecene derivative, a
pentacyclo[7.4.0.12,5.19,12.08,13]-3-pentadecene derivative, a
5 pentacyclopentadecadiene derivative, a
hexacyclo[6.6.1.13,6.110,13.02,7.09,14]-4-heptadecene derivative, a
heptacyclo[8.7.0.1.3.6.110,17.112,15.02,7.011,16]-4-eicosene derivative,
a heptacyclo-5-eicosene derivative, a
heptacyclo[8.8.0.14,7.111,18.113,16.03,8.012,17]-5-heneicosene
10 derivative, an
octacyclo[8.8.0.12,9.14,7.111,18.113,16.03,8.012,17]-5-docosene
derivative, a
nonacyclo[10.9.1.14,7.113,20.115,18.03,8.02,10.012,21.014,19]-5-pentacosen
e derivative, and a
15 nonacyclo[10.10.1.15,8.114,21.116,19.02,11.04,9.013,22.015,20]-5-hexacosen
e derivative.
Among these cyclic olefin monomers,
tetracyclo[4.4.0.12,5.17,10]-3-dodecene is preferable.
As the cyclic olefin monomer for forming the constitutional unit
20 (c), one type of cyclic olefin monomer may be used alone, or two or
more types of cyclic olefin monomers may be used in combination.
[0036]
In the cyclic olefin-based copolymer (A) according to the
present embodiment, in a case where the total content of the
25 constitutional unit (a), the constitutional unit (b), and the
constitutional unit (c) is taken as 100 mol%, the content of the
constitutional unit (c) is preferably equal to or more than 1 mol%
18
and equal to or less than 25 mol% and more preferably equal to or
more than 3 mol% and equal to or less than 20 mol%, from the viewpoint
of facilitating the maintenance of a high refractive index of the
optical component.
5 The content of the constitutional unit (c) can be measured by
13C-NMR.
[0037]
In the cyclic olefin-based copolymer (A) according to the
present embodiment, the ratio ((b)/(c)) of the content of the
10 constitutional unit (b) to the content of the constitutional unit
(c) is preferably equal to or more than 2 and more preferably equal
to or more than 3. In a case where the (b)/(c) is equal to or more
than the above lower limit value, it is possible to obtain an optical
component having a higher refractive index and better long-term
15 reliability of optical performance in a high temperature environment.
In addition, the upper limit value of (b)/(c) is not particularly
limited, and is preferably, for example, equal to or less than 13.
[0038]
The cyclic olefin monomer for forming the constitutional unit
20 (b) or the cyclic olefin monomer for forming the constitutional unit
(c) is produced, for example, by a Diels-Alder reaction of
cyclopentadiene and an olefin having a corresponding structure.
[0039]
In addition, the cyclic olefin-based copolymer (A) according
25 to the present embodiment may include a constitutional unit derived
from another copolymerizable monomer, if necessary, as long as the
object of the present invention is not impaired.
19
Examples of such another monomer include cyclic olefins other
than the cyclic olefin monomer for forming the constitutional unit
(b) and the cyclic olefin monomer for forming the constitutional unit
(c), examples of which include cyclobutene, cyclopentene,
5 cyclohexene, 3,4-dimethylcyclohexene, 3-methylcyclohexene,
2-(2-methylbutyl)-1-cyclohexene, and
3a,5,6,7a-tetrahydro-4,7-methano-1H-indene.
These cyclic olefins may be used alone or in combination.
Further, other olefins such as styrene and α-methylstyrene are also
10 mentioned.
[0040]
It is preferable that the cyclic olefin-based copolymer (A)
according to the present embodiment does not substantially include
a gel-like crosslinked polymer and has a substantially linear
15 structure which may have a branched structure. The fact that the
copolymer has a substantially linear structure can be confirmed by
the fact that the copolymer is dissolved in an organic solvent and
then does not include an insoluble matter. For example, the fact
that the copolymer has a substantially linear structure can be
20 confirmed by the copolymer being completely dissolved in decalin at
135°C in a case where the limiting viscosity [η] of the copolymer
is measured as described later.
In addition, the limiting viscosity ([η]) of the cyclic
olefin-based copolymer (A) according to the present embodiment
25 measured in decalin at 135°C is preferably 0.1 to 2.0 dl/g and more
preferably 0.15 to 1.7 dl/g. In a case where the cyclic olefin-based
copolymer (A) according to the present embodiment has the
20
above-mentioned limiting viscosity ([η]), the mechanical strength
does not decrease and the moldability is excellent, and the effect
on melt fluidity due to increase in molecular weight is small.
[0041]
5 The copolymerization type of the cyclic olefin-based copolymer
(A) according to the present embodiment is not particularly limited,
and examples of the copolymerization type include a random copolymer
and a block copolymer. In the present embodiment, it is preferable
to use a random copolymer as the cyclic olefin-based copolymer (A)
10 according to the present embodiment, from the viewpoint of being able
to obtain a highly accurate optical component whose optical
properties such as transparency, refractive index, and birefringence
index are excellent.
[0042]
15 In the cyclic olefin-based copolymer (A) according to the
present embodiment, it is preferable that the constitutional unit
(b) in the cyclic olefin-based copolymer (A) includes a repeating
unit derived from bicyclo[2.2.1]-2-heptene, and the constitutional
unit (c) in the cyclic olefin-based copolymer (A) includes a repeating
20 unit derived from tetracyclo[4.4.0.12,5.17,10]-3-dodecene.
The cyclic olefin-based copolymer (A) according to the present
embodiment is preferably a random copolymer of ethylene,
bicyclo[2.2.1]-2-heptene, and
tetracyclo[4.4.0.12,5.17,10]-3-dodecene.
25 [0043]
In the present embodiment, one type of the cyclic olefin-based
copolymer (A) may be used alone, or two or more types of the cyclic

1. An optical component comprising:
a cyclic olefin-based copolymer (A),
5 wherein the cyclic olefin-based copolymer (A) has a
constitutional unit (a) derived from at least one olefin represented
by the following general formula (I),
a constitutional unit (b) derived from at least one cyclic olefin
represented by the following general formula (II), and
10 a constitutional unit (c) derived from at least one cyclic olefin
represented by the following general formula (III), and
a content of the constitutional unit (a) is equal to or less
than 50 mol% in a case where a total content of the constitutional
unit (a), the constitutional unit (b), and the constitutional unit
15 (c) is taken as 100 mol%,
[Chem. 1]
(in the general formula (I), R300 represents a hydrogen atom or
a linear or branched hydrocarbon group having 1 to 29 carbon atoms)
20 [Chem. 2]
33
(in the general formula (II), R1 to R8 are each independently
a hydrogen atom, a halogen atom, or a hydrocarbon group having equal
to or less than 4 carbon atoms, R5 to R8 may be bonded to each other
5 to form a monocyclic ring, the monocyclic ring may have a double bond,
and R5 and R6 or R7 and R8 may form an alkylidene group)
[Chem. 3]
(in the general formula (III), n is 0 or 1, m is 0 or a positive
10 integer, n + m is a positive integer, q is 0 or 1, R1 to R18 and Ra
and Rb are each independently a hydrogen atom, a halogen atom, or
a hydrocarbon group, R15 to R18 may be bonded to each other to form
a monocyclic or polycyclic ring, the monocyclic or polycyclic ring
may have a double bond, and R15 and R16 or R17 and R18 may form an
15 alkylidene group).
34
2. The optical component according to claim 1,
wherein a glass transition point (Tg) of the cyclic olefin-based
copolymer (A) measured by DSC is equal to or higher than 140°C.
5 3. The optical component according to claim 1 or 2,
wherein a ratio ((b)/(c)) of a content of the constitutional
unit (b) to a content of the constitutional unit (c) in the cyclic
olefin-based copolymer (A) is equal to or more than 2.
10 4. The optical component according to any one of claims 1 to 3,
wherein the constitutional unit (b) in the cyclic olefin-based
copolymer (A) includes a repeating unit derived from
bicyclo[2.2.1]-2-heptene, and the constitutional unit (c) in the
cyclic olefin-based copolymer (A) includes a repeating unit derived
15 from tetracyclo[4.4.0.12,5.17,10]-3-dodecene.
5. The optical component according to any one of claims 1 to 4,
wherein the constitutional unit (a) in the cyclic olefin-based
copolymer (A) includes a repeating unit derived from ethylene.
20
6. The optical component according to any one of claims 1 to 5,
wherein the optical component is an fθ lens, an image pickup
lens, a sensor lens, a prism, or a light guide plate.
25 7. The optical component according to any one of claims 1 to 6,
wherein the optical component is an in-vehicle camera lens or
a camera lens for a mobile device.