JP2007237567A - Method and apparatus for producing double-sided molding film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for producing a double-sided molding film which can accurately arrange optical elements of the double-sided molding film. <P>SOLUTION: The method for producing the double-sided molding film 30, in which the optical elements 31 and 33 are arranged on both surfaces of a base film 32 to be a foundation, includes the first optical element molding process for molding the first optical element 31 on one surface of the base film by the first molding roll 11 in which a non-ionizing radiation curing resin 31a is supplied to the surface, the second optical element molding process in which in a process after the first optical element molding process, by the second molding roll 12 with a non-ionizing radiation curing resin 33a supplied to the surface, the second optical element 33 is molded on the other surface of the base film, and a non-ionizing radiation-irradiation process for irradiating at least one spot of a part of the base film including a part where the base film is incontact with the first and second molding rolls with non-ionizing radiation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for manufacturing a double-sided molded film in which optical elements are molded on both sides used as a screen in a rear projection television, a flat panel display, and the like, and a method for manufacturing a double-sided molded film.

  In recent years, the demand for rear projection televisions and flat panel displays has increased, and there has been a demand for clearer and higher image quality. In order to satisfy such demand, it is necessary to dispose optical elements with higher accuracy on a double-sided molded film provided as a screen of a rear projection television or a flat panel display.

  Specifically, the relative positional relationship of the optical elements arranged on both sides of the base film must be arranged with higher accuracy. If the relative positional relationship of the optical elements is shifted, the incident light does not appropriately pass through the double-sided molded film in the thickness direction, causing a problem in the image that is the projection light.

  An example of a conventional double-sided film production apparatus is disclosed in Patent Document 1. FIG. 8 shows a schematic diagram of a double-sided film production apparatus 210 described in Patent Document 1. Here, for ease of understanding, reference is made to FIG. 8 as appropriate. The double-sided molded film manufacturing apparatus 210 is disposed on the first process roll 211 that forms an optical element on one surface of the base film 232, and on the other process side of the first mold roll 211, and on the other surface of the base film 232. A second molding roll 212 for molding the optical element. A mold corresponding to the optical element to be molded is provided on each surface of the first molding roll 211 and the second molding roll 212. Then, ultraviolet curable resins 231a and 233a are supplied to the surfaces of the first molding roll 211 and the second molding roll 212, respectively. The supplied UV curable resins 231a and 233a are transferred in close contact with the base film 232 as the first molding roll 211 and the second molding roll 212 rotate, thereby forming an optical element.

  Since the supplied ultraviolet curable resins 231a and 233a are initially semi-liquid with fluidity, it is necessary to solidify the optical element into its shape. For this reason, in the double-sided molded film manufacturing apparatus 210, ultraviolet irradiation devices 220 and 222 are provided in each of the first molding roll 211 and the second molding roll 212. As a result, the ultraviolet curable resin transferred in close contact with the base film 232 is cured and fixed to the base film 232 as an optical element.

JP 3-64701

  However, in the double-sided molded film manufacturing apparatus 210 and the double-sided molded film manufacturing method described in Patent Literature 1, there may be a relative displacement between optical elements arranged on both sides of the base film 232. There are two reasons for this.

  The first reason is due to the thermal behavior of the base film 232. For example, a base film 232 having a thickness of 0.075 mm and a width of 600 mm made of polyethylene terephthalate expands or contracts by 10 to 30 μm per meter due to a temperature change of 1 ° C. On the other hand, in the double-sided molded film manufacturing apparatus 210, heating by ultraviolet irradiation from the ultraviolet irradiation apparatuses 220 and 222, heating or cooling by contact with the first molding roll 211 and the second molding roll 212, and from the first molding roll 211 to the second. It has a process accompanied by a temperature change such as cooling when transferring to the molding roll 212 and cooling by contact with the ultraviolet curable resins 231a and 233a. In such a manufacturing process, it is difficult to arrange optical elements with high accuracy.

  The second reason is due to the lateral movement of the base film 232. This is considered to be affected by the surface accuracy of the base film 232 and the habit of the base film 232. In order to solve this problem, for example, a guide or the like can be installed. Although such a guide can prevent a large lateral movement, it can prevent a small level of lateral movement that affects the arrangement of optical elements. Was difficult.

  Then, this invention makes it a subject to provide the double-sided molded film manufacturing method and double-sided molded film manufacturing apparatus which enable the optical element of a double-sided molded film to be arrange | positioned accurately.

  The present invention will be described below. In order to facilitate understanding of the present invention, reference numerals in the accompanying drawings are appended in parentheses, but the present invention is not limited to the illustrated embodiment.

  The invention according to claim 1 is a method for producing a double-sided molded film (30) in which optical elements (31, 33) are arranged on both sides of a base film (32) as a base, and the surface is non-ionizing radiation cured. From the first optical element molding step of molding the first optical element (31) on one surface of the base film by the first molding roll (11) supplied with the resin (31a), and the first optical element molding step Second optical element molding in which the second optical element (33) is molded on the other surface of the base film by the second molding roll (12) whose surface is supplied with the non-ionizing radiation curable resin (33a) in the subsequent step. A non-ionizing radiation irradiation step of irradiating at least one part of the base film including a part where the base film is in contact with both the first molding roll and the second molding roll. To solve the above problems by providing a double-sided molding film production method of.

  Here, “non-ionizing radiation” means non-ionizing radiation that is widely defined in general. Examples thereof include ultraviolet rays, infrared rays, visible rays, and microwaves. The “non-ionizing radiation curable resin” is a resin having a characteristic of being cured by being irradiated with non-ionizing radiation.

  The invention according to claim 2 further includes a thickness adjusting step of adjusting the thickness of the double-sided molded film (30) in the post-process of the non-ionizing radiation irradiation step of the double-sided molded film manufacturing method according to claim 1. While solving the said subject, it becomes possible to make the thickness precision of a double-sided molded film (30) higher.

  Here, the means for “adjusting the thickness” is not particularly limited, and examples thereof include that performed by a thickness adjusting roll.

  According to a third aspect of the present invention, the relative position between the first optical element (31) and the second optical element (33) of the double-sided molded film manufacturing method according to the first or second aspect is the first molding. It is characterized by being adjusted by the relative position of the roll (31) and the second molding roll (33).

  Invention of Claim 4 is a non-ionizing radiation hardening between the 2nd shaping | molding roll (12) and base film (32) of the double-sided molding film manufacturing method as described in any one of Claims 1-3. A puddle of the resin (33a) is formed, and a step of supplying the non-ionizing radiation curable resin from the puddle to the second molding roll is included.

  Invention of Claim 5 is the circumferential speed of the 1st shaping | molding roll (11) and 2nd shaping | molding roll (12) of the double-sided molding film manufacturing method as described in any one of Claims 1-4. It is characterized by making a difference. Thereby, it becomes possible to improve the releasability of the double-sided molded film (30) from the first roll (11). Here, the circumferential speed difference between the first molding roll and the second molding roll is preferably a mode in which the second molding roll is slightly faster.

  The invention according to claim 6 provides vibration or deformation to the base film (32) before the non-ionizing radiation irradiation step of the double-sided molded film manufacturing method according to any one of claims 1 to 5. The method includes a step of improving releasability. Thereby, it becomes possible to improve the releasability of the double-sided molded film (30) from the first molding roll (11).

  Here, means for giving “vibration or deformation” is not particularly limited, and examples of the means for giving vibration include an ultrasonic vibrator and an electric vibrator. Further, examples of the one that gives deformation include a blade, a roll, vacuum adsorption, electrostatic adsorption, and the like.

  The invention according to claim 7 is a double-sided film production apparatus (10) in which optical elements (31, 33) are arranged on both sides of a base film (32) as a base, and the non-film supplied to the surface. A first molding roll (11) for transferring and molding the first optical element (31) onto one surface of the base film with an ionizing radiation curable resin (31a), and a post-process of the first molding roll with the base film interposed therebetween A second molding roll (12) disposed on the side and configured to transfer and mold the second optical element (33) to the other surface of the base film by the non-ionizing radiation curable resin (33a) supplied to the surface; And at least one non-ionizing radiation irradiation device (21a, 21b) having a part of the base film including a portion where the film is in contact with both the first molding roll and the second molding roll as an irradiation range. To solve the above problems by providing a double-sided molding film production apparatus that.

  The invention described in claim 8 is provided between the second molding roll (12) and the non-ionizing radiation irradiating device (21a, 21b) in the double-sided molded film manufacturing apparatus (10) according to claim 7. The above-mentioned problem is solved by providing a thickness adjusting roll (14) which is a roll disposed so as to sandwich the double-sided molded film (30).

  By the double-sided molded film manufacturing apparatus and the double-sided molded film manufacturing method of the present invention, it is possible to suppress a shift in relative position between optical elements disposed on both sides of the double-sided molded film. As a result, it is possible to provide a double-sided molded film capable of projecting a clear image. Furthermore, by improving the arrangement accuracy of the optical elements, the optical elements can be arranged densely or the optical elements themselves can be made smaller, and further image definition can be achieved.

  Such an operation and gain of the present invention will be made clear from the best mode for carrying out the invention described below.

  Hereinafter, the present invention will be described based on embodiments shown in the drawings.

  First, the double-sided molded film 30 molded by the double-sided molded film manufacturing method and the double-sided molded film manufacturing apparatus of the present invention will be described with reference to FIGS. FIG. 5 is an external perspective view of the double-sided molded film 30, and FIG. 6 is a diagram schematically showing the configuration in the thickness direction of the double-sided molded film 30. 7 schematically shows an example in which the relative positions of the lenses 31 ′, 31 ′,..., Which are optical elements molded on the front and back surfaces of the double-sided molded film 30 ′, and the light shielding layers 33 ′, 33 ′,. FIG.

  The double-sided molded film 30 includes a base film 32 that is a base film, lenses 31, 31,... That are first optical elements molded on one surface of the base film 32, lenses 31 of the base film 32, .. Are provided with light shielding layers 33, 33,... That are second optical elements molded on the other surface.

  5 is a so-called lenticular lens film in which the lenses 31, 31,... Are cylindrical lenses. However, it may be a double-sided molded film provided with a microlens as a lens.

  The double-sided molded film 30 having such a configuration is used as a screen used in, for example, a rear projection television. Specifically, the screen is vertically arranged on the front (observer) side of the rear projection television. At this time, the light shielding layers 33, 33,... Are directed to the front surface (observer) of the television. The screen is configured by appropriately combining with the double-sided molded film 30 and other elements such as a Furnell lens sheet and a support plate.

  The light from the rear part of the rear projection television is incident on the screen as incident light to the lenses 31, 31,..., And the light passes through the double-sided molded film 30 in the thickness direction and is projected as projection light as an image.

  At this time, as shown by A in FIG. 7, if there is a relative displacement between the lenses 31 ', 31', ... and the light shielding layers 33 ', 33', ..., the lenses 31 ', 31', ... The main part of the incident light from the side is blocked by the light shielding layers 33 ′, 33 ′,... Therefore, it is important when the double-sided molded film 30 is manufactured that the positional relationship between the lenses 31, 31,... And the light shielding layers 33, 33,.

  Next, the double-sided molded film manufacturing apparatus 10 of the present invention will be described. FIG. 1 is an external perspective view showing a double-sided molded film manufacturing apparatus 10 according to one embodiment and a double-sided molded film 30 passed through the double-sided molded film manufacturing apparatus 10. Moreover, FIG. 2 is the schematic diagram which looked at the double-sided film production apparatus 10 of FIG. 1 from the side. The double-sided film production apparatus 10 will be described with reference to FIGS.

  The double-sided film production apparatus 10 includes a first molding roll 11, a second molding roll 12, a nip roll 13, and a thickness adjustment roll 14. Furthermore, the 1st ultraviolet irradiation device 20 provided below the lower end of the 1st shaping | molding roll 11, and the 2nd ultraviolet irradiation arrange | positioned above both ends of the base film 32 between the 1st shaping | molding roll 11 and the 2nd shaping | molding roll 12 are provided. It has the apparatus 21a, 21b, and the 3rd ultraviolet irradiation device 22 provided above the 2nd shaping | molding roll 12. FIG. The configuration and arrangement of each member will be described below.

  The 1st shaping | molding roll 11 is a shaping | molding roll which has the type | mold shape corresponding to the lenses 31, 31, ... in the outer peripheral surface. The first molding roll 11 is arranged with the rotation axis horizontal, and rotates around the rotation axis. The first molding roll 11 can move in the horizontal direction and the vertical direction. This is designed so that the relative position with respect to the second molding roll 12 described later can be adjusted.

  The second molding roll 12 is a molding roll having a mold shape corresponding to the light shielding layers 33, 33,. The second molding roll 12 is arranged in parallel to the first molding roll 11 with a predetermined interval on the subsequent process side of the first molding roll 11. The space | interval of the 2nd shaping | molding roll 12 and the 1st shaping | molding roll 11 can be changed with the thickness etc. of the double-sided molded film formed. Therefore, the second molding roll 12 can also move in the horizontal direction and the vertical direction so that the relative position with the first molding roll 11 can be adjusted.

  The relative positions of the first molding roll 11 and the second molding roll 12 are such that the lenses 31, 31,... And the light shielding layers 33, 33,... In the double-sided molded film 30 shown in FIG. It has been adjusted. Specifically, as shown in FIG. 3, the first molding roll 11 and the second molding roll 12 are arranged. FIG. 3 is an enlarged view of a portion indicated by E in FIG. 2, in which a portion where the first molding roll 11 and the second molding roll 12 are abutted is viewed from above the roll. Accordingly, in FIG. 3, the first molding roll 11 rotates in the direction from the back to the front of the paper, and the second molding roll 12 also rotates from the back in the paper to the front. Further, the molded double-sided film 30 also moves in the direction from the back to the front in accordance with the first molding roll 11 and the second molding roll 12.

  In the part where the first and second molding rolls 11, 12 shown in FIG. 3 are attached, the center of the part for molding the lenses 31, 31,... Of the first and second molding rolls 11, 12 and the light shielding layer 33. , 33,... Are aligned with the center of the portion where no molding is performed, as indicated by a one-dot chain line FF in FIG. As a result, the relative positions of the lenses 31, 31,... And the light shielding layers 33, 33,.

  The nip roll 13 is a small-diameter roll provided on the pre-process side of the first molding roll 11, and is arranged with the cylinder axis horizontal, and is arranged in parallel with the first molding roll 11 with a predetermined interval.

  The thickness adjusting roll 14 is a roll arranged so as to sandwich the double-sided molded film 30 between the second forming roll 12. The thickness adjusting roll 14 is provided above the second molding roll 12 after the double-sided molding film 30 is transferred to the second molding roll 12. Thereby, the process of adjusting the thickness of the double-sided molded film 30 is added, and the double-sided molded film 30 with high thickness accuracy can be provided.

  The first ultraviolet irradiation device 20 is a device arranged to irradiate the base film 32 existing on the first molding roll 11 with ultraviolet rays. The first ultraviolet irradiation device 20 has an irradiation range over the entire width of the base film 32. The lenses 31, 31,... Filled in the mold of the first molding roll 11 are cured by the ultraviolet irradiation from the first ultraviolet irradiation device 20, and the base film 32 and the lenses 31, 31,.

  Here, the type of the ultraviolet irradiation device 20 is not particularly limited, and any type of ultraviolet irradiation device can be used. An example of this is a high-pressure mercury lamp. Here, since it is possible to uniformly irradiate the range over the entire width, an ultraviolet irradiation device corresponding to the roll length of the first molding roll 11 may be selected, or the irradiation range may extend over the entire width of the roll length. A plurality of ultraviolet irradiation devices may be arranged. In addition, it is desirable to increase the light density of the irradiation unit by arranging a condensing mirror or the like.

  The second ultraviolet irradiation devices 21 a and 21 b are devices arranged so as to be able to irradiate ultraviolet rays to both end portions of the base film 32 toward the gap between the first molding roll 11 and the second molding roll 12. It is. For example, a high-pressure mercury lamp is used as a light source, ultraviolet rays are incident from the end of the optical fiber by a condenser mirror, and ultraviolet rays are irradiated to both end portions of the base film 32 through the optical fiber. At this time, it is preferable that a lens is disposed at the exit end of the optical fiber so that the gap between the first molding roll 11 and the second molding roll 12 is focused. Although the range of the ultraviolet rays to be irradiated is not particularly limited, an embodiment in which the end portion of the base film 32 is irradiated with a width of about 10 mm can be given. The light shielding layers 33, 33,... Filled in the mold of the second molding roll 12 at the irradiated portions are cured by the ultraviolet irradiation from the second ultraviolet irradiation devices 21a and 21b, and the base film 32 and the light shielding layer 33 are cured. 33, ... are joined. Here, the term “curing” means that the non-ionizing radiation resin is cured to such an extent that the relative displacement between the lenses 31, 31,... And the light shielding layers 33, 33,.

  The third ultraviolet irradiation device 22 is a device arranged so as to irradiate the base film 32 existing on the second molding roll 12 with ultraviolet rays. The third ultraviolet irradiation device 22 is disposed on the downstream side of the thickness adjusting roll 14 and has an irradiation range over the entire width of the base film 32. As with the first ultraviolet irradiation device 20, the third ultraviolet irradiation device 22 is installed so that uniform ultraviolet irradiation can be performed over the entire width. The light shielding layers 33, 33,... Filled in the mold of the second molding roll 12 are cured by ultraviolet irradiation from the third ultraviolet irradiation device 22, and the base film 32 and the light shielding layers 33, 33,. Is done.

  In this embodiment, the ultraviolet curable resins 31a and 33a are cured by the ultraviolet irradiation devices 20, 21, and 22 to mold the lenses 31, 31,... And the light shielding layers 33, 33,. The resin to be used is not particularly limited. For this purpose, the lens and the light-shielding layer may be molded by a “non-ionizing radiation irradiation apparatus” that irradiates a so-called “non-ionizing radiation curable resin” with a corresponding “non-ionizing radiation”. Non-ionizing radiation includes infrared rays and visible rays in addition to ultraviolet rays. In the present embodiment, the ultraviolet curable resin is irradiated with ultraviolet rays from the viewpoints of optical characteristics, ease of application, productivity, and the like. The same applies to the method for producing a double-sided molded film described later.

  The arrangement accuracy of the lenses 31, 31,... And the light shielding layers 33, 33,... Molded on both surfaces of the base film 32 by the double-sided film production apparatus 10 having the above configuration can be improved. Specifically, when all of the lenses 31, 31,... And the light shielding layers 33, 33,... Are in the first and second molding rolls 11, 12, the ultraviolet rays are irradiated by the second ultraviolet irradiation devices 21a, 21b. The light shielding layers 33, 33,... Are formed at the formed portions. This prevents the relative positions of the lenses 31, 31,... And the light shielding layers 33, 33,... From being shifted due to the thermal behavior or lateral movement of the base film 32.

  Next, a method for manufacturing the double-sided molded film 30 will be described with reference to FIGS. First, the base film 32 serving as the basis of the double-sided molded film 30 is supplied to the double-sided molded film manufacturing apparatus 10 from the front side of the double-sided molded film manufacturing apparatus 10 (left side in FIG. 2). The base film 32 supplied to the double-sided molded film manufacturing apparatus 10 is sandwiched between the nip roll 13 and the first molding roll 11 and is in close contact with the first molding roll 11.

  On the other hand, the ultraviolet curable resin 31a is supplied to the surface of the first molding roll 11 before the base film 32 comes into close contact therewith. The ultraviolet curable resin 31 a is sandwiched between the nip rolls 13 after being supplied and is in close contact with the base film 32, so that the shape of the lenses 31, 31,... Of the first molding roll 11 is transferred to one surface of the base film 32. . In this state, the first molding roll 11 rotates and enters the ultraviolet irradiation range of the first ultraviolet irradiation device 20 to irradiate ultraviolet rays. As a result, the ultraviolet curable resin 31a is cured and the lenses 31, 31,... Are molded.

  Then, the base film 32 in which the lenses 31, 31,... Are molded on one surface is rotated between the first molding roll 11 and the second molding roll 12 by the rotation of the first molding roll 11 (shown by E in FIG. 2). Moved). At this time, the ultraviolet curable resin 33a is supplied to the surface of the second molding roll 12 before the base film 32 comes into close contact therewith. The ultraviolet curable resin 33a is supplied from a resin pool provided between the first molding roll 11 and the second molding roll 12 indicated by G in FIG.

  2, the base film 32 and the ultraviolet curable resin 33a are in close contact with each other, and the shape of the light shielding layers 33, 33,... Is the side on which the lenses 31, 31,. Is transferred to the opposite side. At the same time, ultraviolet rays are irradiated from the second ultraviolet irradiation devices 21a and 21b to both ends in the width direction of the base film 32 at the transferred portion in this state. Thereby, the ultraviolet curable resin 33a is cured at the site irradiated with the ultraviolet rays, and the light shielding layers 33, 33,.

  As described above, the second ultraviolet irradiation devices 21a and 21b are arranged such that the lenses 31, 31,... And the light shielding layers 33, 33,. Irradiate ultraviolet rays to the site in each mold. Therefore, there is no possibility that the relative positions of the lenses 31, 31,... And the light shielding layers 33, 33,. And the position of the base film 32 is fixed to the 2nd shaping | molding roll 12 with the said hardened | cured site | part, and it becomes possible to shape | mold the double-sided molding film 30 with high arrangement | positioning precision of an optical element, without shifting | deviating in a post process.

  Moreover, since the 1st shaping | molding roll 11 and the 2nd shaping | molding roll 12 can be moved to a horizontal direction and a perpendicular direction, respectively as mentioned above, it can perform adjusting the relative position easily. Therefore, the relative positions of the lenses 31, 31,... And the light shielding layers 33, 33,... Can be accurately arranged without being affected by the thermal behavior due to temperature changes, the surface accuracy of the base film 32, and the like.

  The double-sided molded film 30 that has passed between the first molding roll 11 and the second molding roll 12 is transferred from the first molding roll 11 to the second molding roll 12. The double-sided molded film 30 moves on the second molding roll 12 following the rotation of the second molding roll 12.

  In the middle of moving following the second molding roll 12, the double-sided molded film 30 then moves to the step of being sandwiched between the thickness adjusting roll 14. Thereby, the thickness of the double-sided molded film 30 is finely adjusted to a desired dimension.

  After the thickness adjusting step, the double-sided molded film 30 is irradiated with ultraviolet rays by the second molding roll 12 being rotated to be within the ultraviolet irradiation range of the third ultraviolet irradiation device 22. As a result, the ultraviolet curable resin 33a is cured and the entire light shielding layers 33, 33... Are molded.

  By the manufacturing method as described above, the light shielding layers 33, 33,... Are arranged with high accuracy without shifting with respect to the lenses 31, 31,. Thereby, it becomes possible to manufacture a highly accurate double-sided molded film.

  In the double-sided film production apparatus 10 described above, the double-sided film 30 is separated from the first molding roll after the ultraviolet irradiation by the first ultraviolet irradiation apparatus 20 and before the base film 32 contacts the second molding roll 12. A step having means for facilitating molding may be included. Thereby, the smoother double-sided molded film manufacturing method can be provided. A means for facilitating release is not particularly limited, but there is a means for giving vibration or deformation to the double-sided molded film. For example, ultrasonic vibrators, electric vibrators, and the like can be given as those that give vibration. Further, examples of the one that gives deformation include a blade, a roll, vacuum adsorption, electrostatic adsorption, and the like. Thereby, the smoother double-sided molded film manufacturing method can be provided. Further, a slight circumferential speed difference may be provided between the first molding roll 11 and the second molding roll 12. At this time, a mode in which the second molding roll 12 is slightly faster is preferable.

  Further, in the embodiment described above, the case where the lenses 31, 31,... Are molded by the first molding roll 11 and the light shielding layers 33, 33,. The light shielding layer may be formed using a roll, and the lens may be formed using a second forming roll.

  Next, the size of the positional deviation between the lenses 31, 31,... And the light shielding layers 33, 33,... Of the double-sided molded film 30 manufactured by the double-sided molded film manufacturing apparatus 10 and the double-sided molded film manufacturing method according to one embodiment. The measurement result regarding will be described as an example. For comparison, the measurement results regarding the size of the positional deviation between the lens and the light shielding layer in the double-sided molded film produced by the conventional double-sided molded film production apparatus and production method are also shown.

  In this example, a lenticular film was produced by molding a light shielding layer with a first molding roll and a cylindrical lens with a second molding roll. More specifically, the base film was made of polyethylene terephthalate, with a thickness of 0.075 mm and a width of 600 mm. Further, a non-ionizing radiation curable resin in which black particles (light absorbing particles) are dispersed is used for the light shielding layer, and a non-ionizing radiation curable resin is used for the lens. The lens pitch was 0.095 mm and the lens height was 0.03 mm. The molding speed at this time is 3 m / min.

  The measurement was performed at each position at intervals of 200 mm in the longitudinal direction of the obtained double-sided molded film having a length of 2000 mm. The size was measured. Therefore, the measurement result of the positional deviation between the lens and the light shielding layer at a total of 33 positions was obtained.

  FIG. 4 shows the measurement results. 4A and 4B, the horizontal axis indicates the longitudinal position of the double-sided molded film, and the vertical axis indicates the amount of positional deviation between the lens and the light shielding layer. (A) has shown the measurement result of the double-sided molded film obtained by the double-sided molded film manufacturing apparatus and double-sided molded film manufacturing method of this invention. On the other hand, (b) has shown the measurement result of the double-sided molded film obtained by the conventional double-sided molded film manufacturing apparatus and the double-sided molded film manufacturing method. In FIG. 4, the shift amount to the right of the light shielding layer surface with respect to the lens surface is “+”, and the shift amount to the left is “−”.

  As can be seen from FIG. 4, the present invention can suppress the positional deviation between the lens and the light shielding layer. Specifically, the difference between the three points measured at each position in the winding direction was 8 μm, which was the largest value in the present invention, whereas it was 44 μm in the conventional one. Further, the difference in the winding direction at each measurement point at both ends and the center in the width direction of the base film was 17 μm in the present invention, and reached 67 μm in the conventional film. From the above results, the positional deviation caused by the thermal behavior of the base film and the positional deviation caused by the lateral movement of the base film are reduced, and the effects of the present invention are remarkably exhibited.

  Although the present invention has been described with reference to the most practical and preferred embodiments at the present time, the invention is limited to the embodiments disclosed herein. However, the present invention can be changed as appropriate without departing from the scope or spirit of the invention that can be read from the claims and the entire specification, and a double-sided molded film manufacturing method and a manufacturing apparatus involving such changes are also within the technical scope of the present invention. It must be understood as included.

It is a perspective view which shows typically the external appearance of the double-sided molded film manufacturing apparatus concerning one embodiment. It is a figure which shows typically the side of a double-sided molded film manufacturing apparatus. It is the figure which expanded and showed the butt | matching part of a 1st shaping | molding roll and a 2nd shaping | molding roll. It is a graph which shows the measurement result of an Example. It is an external appearance perspective view of a double-sided molded film. It is a figure which shows typically the cross-section of a double-sided molded film It is a figure which shows typically the cross-sectional structure of a double-sided molded film when position shift arises in the lens and light shielding layer of a double-sided molded film. It is a figure which shows an example of the conventional double-sided molded film apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Double-sided film production apparatus 11 1st shaping | molding roll 12 2nd shaping | molding roll 13 Nip roll 14 Thickness adjustment roll 20 1st ultraviolet irradiation device 21 2nd ultraviolet irradiation device 22 3rd ultraviolet irradiation device 30 Double-sided molding film 31 Base film 32 Lens 33 Shading layer

Claims (8)

A method for producing a double-sided molded film in which optical elements are arranged on both sides of a base film as a base,
A first optical element molding step of molding the first optical element on one surface of the base film by a first molding roll supplied with a non-ionizing radiation curable resin on the surface;
A second optical element for molding the second optical element on the other surface of the base film by a second molding roll whose surface is supplied with a non-ionizing radiation curable resin in a step subsequent to the first optical element molding step. Molding process;
A non-ionizing radiation irradiating step of irradiating non-ionizing radiation to at least one part of the base film including a part where the base film is in contact with both the first molding roll and the second molding roll; A method for producing a double-sided molded film.   The double-sided molded film manufacturing method according to claim 1, further comprising a thickness adjusting step of adjusting the thickness of the double-sided molded film as a subsequent step of the non-ionizing radiation irradiation step.   The relative position between the first optical element and the second optical element is adjusted by the relative position between the first molding roll and the second molding roll. 2. A method for producing a double-sided molded film according to 1.   A liquid pool of the non-ionizing radiation curable resin is formed between the second molding roll and the base film, and the supply of the non-ionizing radiation curable resin is performed from the liquid pool to the second molding roll. The method for producing a double-sided molded film according to any one of claims 1 to 3, further comprising a step.   The method for producing a double-sided molded film according to any one of claims 1 to 4, wherein a difference is made in circumferential speed between the first molding roll and the second molding roll.   The double-sided molding according to any one of claims 1 to 5, further comprising a step of improving releasability by applying vibration or deformation to the base film before the non-ionizing radiation irradiation step. Film manufacturing method. An apparatus for producing a double-sided molded film in which optical elements are arranged on both sides of a base film as a base,
A first molding roll for transferring and molding the first optical element on one surface of the base film with a non-ionizing radiation curable resin supplied to the surface;
The second optical element is transferred and molded onto the other surface of the base film by a non-ionizing radiation curable resin which is disposed on the downstream side of the first molding roll with the base film interposed therebetween and is supplied to the surface. A second molding roll;
Double-sided molding comprising: at least one non-ionizing radiation irradiation device in which a part of the base film including a portion in contact with both the first molding roll and the second molding roll is in an irradiation range. Film manufacturing equipment. On the subsequent process side of the non-ionizing radiation irradiation device,
The double-sided film production apparatus according to claim 7, further comprising a thickness adjusting roll which is a roll disposed so as to sandwich the double-sided film between the second shaping roll.

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