JP2023034294A - Apparatus for manufacturing resin film, method for manufacturing resin film, and method for inspecting resin film - Google Patents

Abstract

To provide an apparatus for manufacturing a resin film which includes an inspection device that dispenses with a dark room for inspection and is compact.SOLUTION: An apparatus for manufacturing a resin film includes a conveyance device for continuously conveying a long resin film, and an inspection device for inspecting the continuously conveyed resin film, wherein the inspection device includes a light source for irradiating a main surface of the resin film conveyed by the conveyance device with parallel rays and an imaging device, the imaging device includes a telecentric lens and an imaging element, and the telecentric lens receives transmission light of the parallel rays with which the main surface of the resin film is irradiated and allows the imaging element to form an image.SELECTED DRAWING: Figure 1

Description

The present invention relates to a resin film manufacturing apparatus, a resin film manufacturing method, and a resin film inspection method.

2. Description of the Related Art Display devices such as liquid crystal display devices and organic electroluminescence display devices may include a resin film made of resin as an optical element. If a resin film having optical defects is used as an optical element, the product quality may be degraded. Therefore, in the process of manufacturing a resin film, inspections for the presence or absence of defects are performed by various methods.

For example, a system has been devised that acquires an image of an optical film defect projected on a screen to acquire the defect of the optical film (see Patent Document 1).

In addition, a first inspection means for irradiating inspection light from the normal direction of the surface of the film and inspecting using transmitted light, and irradiating after inspection from an angle smaller than 90 ° and using the transmitted light An inspection device including a second inspection means for inspection has been devised (see Patent Document 2).

Also, a method has been devised for determining the type of defect using data including reflection image data and transmission image data of a film (see Patent Document 3).

Japanese Patent Application Publication No. 2019-516989 JP 2007-298416 A JP 2012-167975 A

However, a system for projecting a defect image onto a screen, such as the technique disclosed in Patent Document 1, requires a darkroom for inspection, which complicates film manufacturing facilities.

In addition, an inspection apparatus having a plurality of inspection means, such as the technique of Patent Document 2, and an inspection apparatus using both reflected light and transmitted light, such as the technique of Patent Document 3, are required for arrangement. It tends to take up a lot of space and can be difficult to locate on the equipment that manufactures the film.

Therefore, a compact resin film manufacturing apparatus including an inspection apparatus that does not require a darkroom for inspection; a resin film manufacturing method that can be performed with a compact apparatus without requiring a darkroom; and a compact apparatus that does not require a darkroom. A resin film inspection method that can be used is required.

As a result of intensive studies to solve the above-mentioned problems, the inventors of the present invention have found that the above-mentioned problems can be solved by including a specific light source and a specific imaging device in the inspection apparatus included in the resin film manufacturing apparatus. and completed the present invention.
That is, the present invention provides the following.

[1] Including a conveying device that continuously conveys a long resin film and an inspection device that inspects the continuously conveyed resin film,
The inspection device includes a light source and an imaging device for irradiating parallel rays onto the main surface of the resin film transported by the transport device,
The imaging device includes a telecentric lens and an imaging device,
The telecentric lens is a resin film manufacturing apparatus that receives transmitted light of parallel light beams irradiated onto the main surface of the resin film and forms an image on the imaging element.
[2] including a plurality of the imaging devices,
A plurality of the imaging devices are arranged such that the intersection point P between the optical axis of the telecentric lens included in the imaging device and the main surface of the resin film is aligned along a straight line parallel to the width direction of the resin film. The apparatus for producing a resin film according to [1].
[3] The plurality of imaging devices are arranged such that the signs of the angles formed by the respective optical axes of the telecentric lenses corresponding to the adjacent points of intersection P and the perpendicular to the main surface of the resin film are opposite to each other. , the apparatus for producing a resin film according to [2].
[4] The angle formed by the optical axis of the telecentric lens and the perpendicular to the main surface of the resin film, and the angle formed by the optical axis of the light source and the perpendicular to the main surface of the resin film can be changed. , the apparatus for producing a resin film according to any one of [1] to [3].
[5] The apparatus for producing a resin film according to any one of [1] to [4], wherein the distance between the imaging device and the main surface of the resin film can be changed.
[6] A step of continuously conveying a long resin film,
a step of irradiating parallel light beams onto the main surface of the resin film being transported; and a step of receiving transmitted light of the parallel light beams irradiated onto the main surface of the resin film by a telecentric lens and forming an image on an imaging device;
A method for producing a resin film, comprising:
[7] A step of continuously conveying a long resin film,
a step of irradiating parallel light beams onto the main surface of the resin film being transported; and a step of receiving transmitted light of the parallel light beams irradiated onto the main surface of the resin film by a telecentric lens and forming an image on an imaging device;
A method for inspecting a resin film, comprising:

According to the present invention, a compact resin film manufacturing apparatus including an inspection apparatus that does not require a darkroom for inspection; a resin film manufacturing method that can be performed with a compact apparatus without requiring a darkroom; and a darkroom with a compact apparatus. It is possible to provide a resin film inspection method that can be performed without requiring.

FIG. 1 is a side view schematically showing a resin film manufacturing apparatus according to one embodiment of the present invention. FIG. 2 is a front view schematically showing an inspection device included in the resin film manufacturing apparatus according to one embodiment of the present invention. FIG. 3 is a perspective view schematically showing part of an inspection device included in a resin film manufacturing apparatus according to an embodiment of the present invention. FIG. 4 is a schematic diagram showing an imaging range of an imaging device included in a resin film manufacturing apparatus according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail by showing embodiments and examples. However, the present invention is not limited to the embodiments and examples shown below, and can be arbitrarily modified without departing from the scope of the claims of the present invention and their equivalents. The constituent elements of the embodiments shown below can be combined as appropriate. Further, in the drawings, the same constituent elements are denoted by the same reference numerals, and the description thereof may be omitted.

In the following description, a "long" film refers to a film having a length of 5 times or more, preferably 10 times or more, with respect to the width, specifically a roll A film that is long enough to be rolled up into a shape and stored or transported. The upper limit of the length of the film is not particularly limited, and can be, for example, 100,000 times or less the width.

In the following description, the term "(meth)acryl" encompasses "acryl", "methacryl" and combinations thereof.

In the following description, the terms “parallel”, “perpendicular” and “perpendicular” in the directions of the elements are within a range that does not impair the effects of the present invention, such as ±3°, ±2° or ±1°, unless otherwise specified. may contain an error within the range of

[1. Resin film manufacturing equipment]
A resin film manufacturing apparatus according to an embodiment of the present invention includes a conveying device that continuously conveys a long resin film, and an inspection device that inspects the continuously conveyed resin film. The inspection device includes a light source and an imaging device for irradiating parallel rays onto the main surface of the resin film conveyed by the conveying device. The imaging device includes a telecentric lens and an imaging element. The telecentric lens receives the transmitted light of the parallel rays irradiated onto the main surface of the resin film and forms an image on the imaging device.

Since the resin film manufacturing apparatus of the present embodiment includes a light source that emits parallel rays and a telecentric lens that receives transmitted light and forms an image on the imaging device, defects in the resin film can be inspected with a simple configuration. Therefore, the inspection device included in the resin film manufacturing apparatus of the present embodiment can be made compact, and the resin film manufacturing apparatus can be made compact. In addition, a resin film manufacturing apparatus that does not require darkroom equipment can be provided.

Hereinafter, the apparatus for producing a resin film according to the present embodiment will be described with reference to the drawings.
FIG. 1 is a side view schematically showing a resin film manufacturing apparatus according to one embodiment of the present invention. FIG. 2 is a front view schematically showing an inspection device included in the resin film manufacturing apparatus according to one embodiment of the present invention. FIG. 3 is a perspective view schematically showing part of an inspection device included in a resin film manufacturing apparatus according to an embodiment of the present invention.

As shown in FIG. 1 , the resin film manufacturing apparatus 1000 according to the present embodiment includes a transport roll 11 , a transport roll 12 , a transport roll 13 , and a transport roll 14 as transport devices, and an inspection device 100 . The inspection apparatus 100 includes a light source 110a, a light source 110b, a light source 110c, and a light source 110d, and an imaging device 120a, an imaging device 120b, an imaging device 120c, and an imaging device 120d.

The long resin film 1 is extruded from a die (not shown), cast on a cast roll (not shown), and transported in order by a transport roll 11, a transport roll 12, a transport roll 13, and a transport roll 14 as transport devices, It is wound into a roll by a winder 15 .
Both the transport roll 12 and the transport roll 13 can transport the resin film 1 by contacting one main surface 1D of the resin film 1 and rotating.

The resin film 1 may be continuously transported by a transport device other than these transport rolls. For example, the conveying device can include any element for continuously conveying the resin film 1, such as nip rolls and driving devices.

As shown in FIGS. 1 and 2, a plurality of light sources 110a, 110b, 110c, and 110d are arranged on one main surface 1D side of the resin film 1. As shown in FIGS. The light sources 110a, 110b, 110c, and 110d are attached to the base 150 and arranged so as to irradiate the main surface 1D side of the resin film 1 conveyed by the conveying rolls 12 and 13 with light rays.

The light sources 110a, 110b, 110c, and 110d are configured to emit parallel light rays. As the light sources 110a, 110b, 110c, and 110d, a light source combining a light emitting element and a collimator can be used. The type of collimator combined with the light emitting element is not particularly limited, and both a reflective collimator and a refractive collimator can be used.

The light emitted by the light sources 110a, 110b, 110c, and 110d may be light having a wavelength in the visible light range, infrared light, or ultraviolet light. As the light source, for example, a metal halide lamp, a light emitting diode, or another light emitting element may be used.

The light sources 110a, 110b, 110c, and 110d are preferably arranged so that the parallel light beams they emit are parallel to the optical axis of a telecentric lens, which will be described later. This allows detection of various types of defects.

A plurality of imaging devices 120a, 120b, 120c, and 120d are attached to the mount 150, and arranged on the other main surface 1U side of the resin film 1. As shown in FIG. The imaging devices 120a, 120b, 120c and 120d respectively include telecentric lenses 121a, 121b, 121c and 121d and imaging elements 122a, 122b, 122c and 122d.

The telecentric lenses 121a, 121b, 121c, and 121d are optical elements having an optical system with telecentricity. Telecentricity means the property that the principal ray is parallel to the optical axis.
The telecentric lenses 121a, 121b, 121c, and 121d may have object-side telecentricity, image-side telecentricity, or both-side telecentricity, and are preferably image-side telecentric. It has telecentricity.
The telecentric lenses 121a, 121b, 121c, and 121d may be composed of multiple elements such as lenses, diaphragms, and mirrors.

As the imaging devices 122a, 122b, 122c, and 122d, for example, a solid-state imaging device using a CCD (Charge Coupled Device) or a solid-state imaging device using a CMOS (Complementary Metal Oxide Semiconductor) can be used. .

The imaging devices 120a, 120b, 120c, and 120d may be connected to an image processing device, which will be described later.

In this embodiment, the inspection device includes multiple light sources and multiple imaging devices, but in other embodiments, the inspection device may include only one light source and one imaging device. In addition, although the number of light sources and the number of imaging devices provided in the inspection apparatus are each four in this embodiment, they are not particularly limited. 7 each, 8 each, 9 each, or 10 each. The number of light sources provided in the inspection apparatus and the number of imaging devices may or may not match. Preferably, the number of light sources provided in the inspection apparatus and the number of imaging devices are the same.

Equipping the inspection apparatus 100 with a plurality of light sources 110a, 110b, 110c, 110d and a plurality of imaging devices 120a, 120b, 120c, 120d has the following advantages.
In order to image the entire width of the resin film 1 with one light source and one imaging device, the diameter of the telecentric lens is usually the same as the width of the resin film 1 or larger than the width of the resin film 1. Use the big one. This is because the angle of view of a telecentric lens is usually 0° or close to it.
On the other hand, when the resin film 1 is imaged over the entire width direction by a plurality of light sources and a plurality of imaging devices, a telecentric lens having a diameter smaller than the width of the resin film 1 is usually used as the telecentric lens included in the imaging device. sell. Therefore, the size of the inspection apparatus 100 can be made more compact.

Intersection points Pa, Pb, and Pc between optical axes C1a, C1b, C1c, and C1d of telecentric lenses 121a, 121b, 121c, and 121d included in imaging devices 120a, 120b, 120c, and 120d, respectively, and main surface 1U of resin film 1. , Pd are arranged along a straight line L1 parallel to the width direction TD of the resin film 1.
Thereby, the entire width direction of the resin film 1 can be imaged by the plurality of imaging devices 120a, 120b, 120c, and 120d.

Here, the imaging devices 120a, 120b, 120c, and 120d are arranged so that all of the plurality of intersection points Pa, Pb, Pc, and Pd corresponding to the plurality of imaging devices 120a, 120b, 120c, and 120d are on the straight line L1. Alternatively, some or all of the plurality of intersections Pa, Pb, Pc, and Pd are present in the vicinity of the straight line L1 (preferably, at positions where the distance from the straight line L1 is 700 mm or less). 120a, 120b, 120c, 120d may be arranged.

FIG. 4 is a schematic diagram showing an imaging range of an imaging device included in a resin film manufacturing apparatus according to an embodiment of the present invention.
As shown in FIG. 4, the intersection point Pa corresponding to the imaging device 120a, the intersection point Pb corresponding to the imaging device 120b, the intersection point Pc corresponding to the imaging device 120c, and the intersection point Pd corresponding to the imaging device 120d are formed by a resin film. They are arranged along a straight line L1 parallel to the width direction of 1. An imaging range Aa, an imaging range Ab, an imaging range Ac, and an imaging range Ad are imaging ranges on the resin film 1 of the imaging device 120a, the imaging device 120b, the imaging device 120c, and the imaging device 120d, respectively.
The imaging range Aa and the imaging range Ab, the imaging range Ab and the imaging range Ac, and the imaging range Ac and the imaging range Ad each have a common range. The imaging devices 120a, 120b, 120c, and 120d are arranged so that the straight line L1 passes through these common ranges, and the imaging ranges Aa, Ab, Ac, and Ad of the imaging devices 120a, 120b, 120c, and 120d are respectively arranged. is set.
Thus, the entire width direction of the resin film 1 can be imaged by the imaging devices 120a, 120b, 120c, and 120d.

A plurality of imaging devices 120a, 120b, 120c, and 120d are arranged such that the signs of the angles formed by the respective optical axes of the telecentric lenses corresponding to the adjacent points of intersection P and the perpendicular to the main surface 1U of the resin film 1 are opposite to each other. It is
However, by rotating the optical axis in one direction within a plane containing the optical axis around the intersection point P, the sign of the angle is positive when it can be aligned with the perpendicular to the main surface 1U of the resin film 1, and the light The sign of the angle when it can be aligned with the normal to the main surface 1U of the resin film 1 by rotating the axis in the direction opposite to the one direction in the plane containing the optical axis around the intersection point P is negative. do. By arranging the plurality of imaging devices 120a, 120b, 120c, and 120d in this way, the resin film 1 can be imaged over the entire width direction by the plurality of imaging devices.

The reason is as follows.
Since the telecentric lens included in the imaging device has an angle of view of 0° or a size close to it, when a plurality of imaging devices are arranged in a row in the width direction of the resin film 1, no imaging is performed in the width direction of the resin film 1. Ranges may occur. As described above, by arranging a plurality of imaging devices such that the signs of the angles formed by the respective optical axes of the telecentric lenses corresponding to the adjacent points of intersection P and the perpendicular to the main surface 1U of the resin film 1 are opposite to each other. Since the imaging ranges of the resin film 1 of the plurality of imaging devices can be overlapped, the resin film 1 can be imaged over the entire width direction by the plurality of imaging devices.

It is preferable that the absolute values of the angles formed by the respective optical axes of the telecentric lenses corresponding to the adjacent points of intersection P and the perpendicular are the same or substantially the same.
When the arithmetic mean value of the absolute values of the angle θ formed by the optical axis of the telecentric lens and the perpendicular to the main surface 1U of the resin film 1 is θave, the value of θave−|θ| is preferably 0°±35°. more preferably within the range of 0°±25°, still more preferably within the range of 0°±20°.

The arrangement of the plurality of imaging devices 120a, 120b, 120c, and 120d in the manufacturing apparatus 1000 of this embodiment will be described with reference to FIG.
As shown in FIG. 3, the angle between the optical axis C1a of the telecentric lens 121a corresponding to the intersection point Pa and the perpendicular Va to the main surface 1U of the resin film 1 passing through the intersection point Pa is θa. The angle between the optical axis C1b of the telecentric lens 121b corresponding to Pb and the perpendicular Vb to the main surface 1U of the resin film 1 passing through the intersection Pb is θb, and the angle of the telecentric lens 121c corresponding to the intersection Pc adjacent to the intersection Pb is θb. The angle between the optical axis C1c and the perpendicular Vc to the main surface 1U of the resin film 1 passing through the intersection point Pc is θc, and passes through the intersection point Pd and the optical axis C1d of the telecentric lens 121d corresponding to the intersection point Pd adjacent to the intersection point Pc. The angle between main surface 1U of resin film 1 and normal Vd is θd.

In this embodiment, the sign of θa is positive, the sign of θb is negative, the sign of θc is positive, and the sign of θd is negative. Further, if the arithmetic average value of |θa|, |θb|, |θc|, and |θd| , and (θave−|θd|) are each 0°.

The angle θ between the optical axis of the telecentric lens and the perpendicular to the main surface 1U of the resin film 1 is not particularly limited. ° or more, such as 35° or less, such as 20° or less.

The angle θa between the optical axis C1a of the telecentric lens 121a and the perpendicular Va to the main surface 1U of the resin film 1, the angle θb between the optical axis C1b of the telecentric lens 121b and the perpendicular Vb to the main surface 1U of the resin film 1, the telecentric lens The angle θc between the optical axis C1c of the lens 121c and the perpendicular Vc to the main surface 1U of the resin film 1 and the angle θd between the optical axis C1d of the telecentric lens 121d and the perpendicular Vd to the main surface 1U of the resin film 1 can be changed. The imaging devices 120a, 120b, 120c, and 120d are attached to the pedestal 150 so that . This makes it easier to adjust the inspection conditions.

Furthermore, the imaging devices 120a, 120b, 120c, and 120d are attached to the frame 150 so that the distance between each of the imaging devices 120a, 120b, 120c, and 120d and the main surface 1U of the resin film 1 can be changed. It is This makes it easier to adjust the inspection conditions.

The light sources 110a, 110b, 110c, and 110d are attached to the mount 150 so that the angles formed by the optical axes of the light sources 110a, 110b, 110c, and 110d and the perpendicular to the main surface 1U of the resin film 1 can be changed. ing. This makes it easier to adjust the inspection conditions.

The imaging devices 120a, 120b, 120c, and 120d and the light sources 110a, 110b, 110c, and 110d can be attached to the base 150 by any means. can be installed.

The resin film 1 may have a single layer structure or may have a multilayer structure.

The resin film 1 is made of resin and contains resin. Examples of resins forming the resin film 1 include thermoplastic resins. Resins can typically include polymers.
Examples of polymers include cellulosic polymers (e.g., triacetyl cellulose); polymers containing alicyclic structures (e.g., cycloolefin polymers); polyesters (e.g., polyethylene terephthalate); acrylic polymers (e.g., , poly(meth)acrylic acid, poly(meth)acrylate, polyacrylonitrile); polycarbonate; polystyrene; polyamide; polyvinyl chloride; polyvinyl acetate;
The resin forming the resin film 1 may contain a polymer singly or in combination of two or more. Moreover, the polymer may be a homopolymer or a copolymer. The resin may contain optional additives in addition to the polymer.

Examples of polymers containing an alicyclic structure include (1) norbornene-based polymers, (2) monocyclic cyclic olefin polymers, (3) cyclic conjugated diene polymers, and (4) vinyl alicyclic carbonization. Hydrogen polymers and their hydrides are mentioned. Among these, norbornene-based polymers and their hydrides are preferred from the viewpoint of transparency and moldability.

Examples of norbornene-based polymers include ring-opening polymers of monomers having a norbornene structure and hydrides thereof; addition polymers of monomers having a norbornene structure and hydrides thereof. Examples of ring-opening polymers of monomers having a norbornene structure include ring-opening homopolymers of one type of monomer having a norbornene structure, and ring-opening of two or more types of monomers having a norbornene structure. Copolymers, and ring-opening copolymers of monomers having a norbornene structure and arbitrary monomers copolymerizable therewith. Furthermore, examples of addition polymers of monomers having a norbornene structure include addition homopolymers of one type of monomer having a norbornene structure, and addition copolymers of two or more types of monomers having a norbornene structure. and addition copolymers of monomers having a norbornene structure and arbitrary monomers copolymerizable therewith. Examples of these polymers include those disclosed in JP-A-2002-321302.

Preferred specific examples of norbornene-based polymers and hydrides thereof include "Zeonor" manufactured by Nippon Zeon; "Arton" manufactured by JSR; and "TOPAS" manufactured by TOPAS ADVANCED POLYMERS.

The resin film 1 to be inspected preferably has high transparency. The haze of the resin film 1 is preferably 5% or less, more preferably 3% or less, still more preferably 1% or less, and usually 0% or more. Thereby, defects in the resin film 1 can be inspected with high accuracy.

The inspection apparatus 100 can inspect various defects of the resin film 1 . The inspection apparatus 100 can inspect defects such as linear defects and point defects.

[2. Method for manufacturing resin film]
A method of manufacturing a resin film using the resin film manufacturing apparatus 1000 will be described below.
A method for producing a resin film according to one embodiment of the present invention includes a step of continuously conveying a long resin film (hereinafter also referred to as step (1)), a main surface of the conveyed resin film, A step of irradiating parallel rays (hereinafter also referred to as step (2)), and a step of receiving transmitted light of the parallel rays irradiated to the main surface of the resin film by a telecentric lens and forming an image on an imaging device (hereinafter Also referred to as step (3)). Step (1), step (2) and step (3) are usually performed simultaneously.

(Step (1))
In step (1), a long resin film 1 is continuously conveyed. The resin film 1 is continuously transported, for example, by transport rolls 11, 12, 13, and 14 as transport devices.

(Step (2))
In step (2), parallel rays are applied to the main surface 1D of the resin film 1 being conveyed.
Irradiation of parallel rays can be performed by, for example, a plurality of light sources 110a, 110b, 110c, and 110d. The parallel rays are preferably parallel to the optical axes of the telecentric lenses 121a, 121b, 121c, 121d.

(Step (3))
In step (3), the telecentric lens receives the transmitted light of the parallel light beams irradiated onto the main surface of the resin film and forms an image on the imaging element.
The telecentric lenses are, for example, a plurality of telecentric lenses 121a, 121b, 121c, and 121d, and the plurality of telecentric lenses 121a, 121b, 121c, and 121d are for example a plurality of light sources 110a, 110b, 110c, and 110d. It receives the transmitted light of the light beam. The telecentric lenses 121a, 121b, 121c, and 121d image the received light transmitted through the resin film 1 on, for example, a plurality of imaging elements 122a, 122b, 122c, and 122d.

(Step (4))
The method for producing a resin film of the present embodiment may include step (4) in addition to steps (1) to (3). Step (4) is usually performed after steps (2) to (3).
Step (4) is a step of processing the image data obtained by the imaging device to detect defects.
For example, step (4) is performed by an image processing device. For example, an image processing device includes an input interface, an output interface, a CPU (Central Processing Unit), a main memory, and an auxiliary memory. The input interface, output interface, CPU, main memory and auxiliary memory are connected by a bus to exchange data and control information. The CPU reads out and executes a program stored in the main storage device, and the image processing device functions as an image processing section that processes image data and a defect detection section that detects defects in the resin film based on the processed image data. Let
For example, imaging devices 120a, 120b, 120c, and 120d are connected to the input interface. A display, for example, is connected to the output interface and can display the inspection result of the resin film.

Step (4) may include steps (4a) and (4b).
In step (4a), the image processing unit of the image processing device processes the image data obtained by the imaging device.
In step (4b), the defect detector of the image processing device detects defects in the resin film based on the processed image data. The defect detection unit may detect at least one of the type and size of defects in addition to the presence or absence of defects in the resin film.

(Other optional processes)
The method for producing a resin film of the present embodiment may include any steps other than steps (1) to (4). For example, when a long resin film is produced by a melt extrusion method, it may include a step of extruding the molten resin through a die and a step of cooling the extruded film on cast rolls. For example, when a long resin film is produced by a solution casting method, it may include a step of casting a resin-containing solution and a step of drying the cast solution.

Further, the method for manufacturing the resin film of the present embodiment can include, for example, a step of stretching the resin film, a step of winding the resin film on the winder 15, and a step of cutting the resin film. The step of stretching the resin film may be performed before steps (1) to (3) or may be performed after steps (1) to (3).
By including steps (1) to (3) in the method for producing a resin film, a resin film inspected for defects can be produced with a compact apparatus without requiring a darkroom.

[3. Resin film inspection method]
The method for inspecting a resin film according to one embodiment of the present invention comprises the above step (1) of continuously conveying a long resin film, the and the step (3), in which the telecentric lens receives the transmitted light of the parallel rays irradiated onto the main surface of the resin film and forms an image on the imaging element. The inspection method of the resin film may include optional steps in addition to the steps (1) to (3). For example, the resin film inspection method may include the step (4).
By including steps (1) to (3) in the method for inspecting a resin film, it is possible to inspect for defects in the resin film using a compact device without requiring a darkroom.

1 resin film 1D main surface 1U main surface 11, 12, 13, 14 transport roll (transport device)
15 winding machine 110a, 110b, 110c, 110d light source 120a, 120b, 120c, 120d imaging device 121a, 121b, 121c, 121d telecentric lens 122a, 122b, 122c, 122d imaging element 100 inspection device 150 mount 1000 manufacturing device C1a, C1a , C1c, C1d Optical axis Pa, Pb, Pc, Pd Intersection Va, Vb, Vc, Vd Perpendicular line

Claims (7)

Including a conveying device for continuously conveying a long resin film and an inspection device for inspecting the continuously conveyed resin film,
The inspection device includes a light source and an imaging device for irradiating parallel rays onto the main surface of the resin film transported by the transport device,
The imaging device includes a telecentric lens and an imaging device,
The telecentric lens is a resin film manufacturing apparatus that receives transmitted light of parallel light beams irradiated onto the main surface of the resin film and forms an image on the imaging element. including a plurality of the imaging devices,
A plurality of the imaging devices are arranged such that the intersection point P between the optical axis of the telecentric lens included in the imaging device and the main surface of the resin film is aligned along a straight line parallel to the width direction of the resin film. 2. The apparatus for producing a resin film according to claim 1. The plurality of imaging devices are arranged such that the signs of the angles formed by the respective optical axes of the telecentric lenses corresponding to the adjacent points of intersection P and the perpendicular to the main surface of the resin film are opposite to each other. 3. The apparatus for producing a resin film according to 2. The angle formed by the optical axis of the telecentric lens and the normal to the main surface of the resin film, and the angle formed by the optical axis of the light source and the normal to the main surface of the resin film are each changeable. 4. The apparatus for producing a resin film according to any one of 1 to 3. 5. The apparatus for manufacturing a resin film according to claim 1, wherein the distance between said imaging device and the main surface of said resin film is variable. A step of continuously conveying a long resin film,
a step of irradiating parallel light beams onto the main surface of the resin film being transported; and a step of receiving transmitted light of the parallel light beams irradiated onto the main surface of the resin film by a telecentric lens and forming an image on an imaging device;
A method for producing a resin film, comprising: A step of continuously conveying a long resin film,
a step of irradiating parallel light beams onto the main surface of the resin film being transported; and a step of receiving transmitted light of the parallel light beams irradiated onto the main surface of the resin film by a telecentric lens and forming an image on an imaging device;
A method for inspecting a resin film, comprising:

Images