JP2010020032A - Method of manufacturing screen protection film for preventing peep of information terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the efficiency of producing a screen protection film for preventing peep of an information terminal such as a computer. <P>SOLUTION: An opaque pigment is applied on one surface of a transparent thermoplastic resin film to form a pigment applied film and further a pigment applied film is superposed thereon to form a film superposed body. The film superposed body is mounted on a support and an infrared ray transmission solid is superposed thereon to form a film laminate. The film laminate is irradiated with infrared beams in a superposing direction from a side of the infrared ray transmission solid in a pressurizing state to form a film welded body. After removing the transmission solid, the pigment applied film is superposed on the film welded body to form the film laminate. The step described above is repeated necessary times. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to the manufacture of a screen protection film for preventing peeping of information terminals such as televisions and notebook computers.

  Screen protection film for information terminal peep prevention is attached in front of the display screen of information terminals such as TVs and notebook computers, and other people at different angles (non-front) other than the user at the front view A film that has the function of making it impossible to do.

  The principle will be described with reference to FIG. On the protective film 2, transparent stripe portions 2a and opaque stripe portions 2b orthogonal to the surface are alternately arranged in parallel. Since the line of sight A of the user in front is orthogonal to the screen 1, the screen 1 can be seen through the transparent portion 2a, but the line of sight B of the other person in front is skewed to the screen 1 and blocked by the opaque portion 2b. The screen 1 cannot be visually recognized.

  An example of the manufacturing process of such a protective film is as follows. An opaque pigment 22 is applied to one side of a thin transparent thermoplastic resin film 21 (thickness of 100 μm or less). This opaque pigment is generally black carbon and has a thickness of about several μm. Next, a plurality of pigment-coated thermoplastic resin films are stacked and heat-welded by hot plate pressing from both sides in the thickness direction to form a laminate 23 (performed at a temperature equal to or higher than the melting point of the thermoplastic resin film). Next, after cooling and solidifying, the protective film 2 is formed by cutting thinly in the direction perpendicular to the stacking direction. The portion corresponding to the thermoplastic resin film becomes the transparent portion 2a, and the portion corresponding to the dye becomes the opaque portion 2b.

  By the way, the dimension in the stacking direction of the laminate is proportional to the size of the screen to be protected. The thickness of the dye-coated thermoplastic resin film is at most 100 μm, whereas the screen size is in cm. In other words, in order to attach a protective thermoplastic resin film to the entire target screen, it is necessary to laminate several thousand dye-coated thermoplastic resin films, especially in the case of large screen televisions, the number of laminated thermoplastic resin films is enormous. It is inevitable to increase the size of the laminate. Along with this, the heating time and cooling time required for heat welding of the thermoplastic resin film reach several tens of hours, respectively, and the production efficiency is greatly reduced due to the long processing time.

  In view of the current situation, an object of the present invention is to improve production efficiency in manufacturing a screen protection film for preventing peeping of information terminals such as mobile phones and notebook computers.

  Therefore, in the method of the present invention, (a) an opaque pigment is applied to one side of a transparent thermoplastic resin film to form a pigment-coated thermoplastic resin film, and (b) a first pigment-coated thermoplastic resin film. A thermoplastic resin film polymer is formed by superimposing a second dye-coated thermoplastic resin film on the top, and (c) the thermoplastic resin film polymer is placed on a support, on which infrared rays are transmitted. A thermoplastic resin film laminate is formed by superimposing solids, and (d) the thermoplastic resin film is welded by irradiating an infrared beam from the infrared transmitting solid side in a state where the thermoplastic resin film laminate is pressed in the direction of polymerization. (E) a thermoplastic resin film laminate is formed by superimposing a third dye-coated thermoplastic resin on the thermoplastic resin film welded body, excluding the infrared transmitting solid, and (f) Step (c) ~ repeating a necessary number of times the (e) it is an gist.

Heating required for welding is instantaneously performed, and cooling is completed during the formation of the thermoplastic resin film laminate in the next repetitive step. Since it is radiation heating by an infrared beam, it is only necessary to heat the vicinity of the interface of the thermoplastic resin film, which is more efficient than conventional heat conduction heating. Together, the production efficiency in manufacturing the protective film can be greatly improved.

  It is desirable that the infrared transmissive solid exhibits a property of well transmitting an infrared beam absorbed by the thermoplastic resin film.

Further, it is desirable that the infrared transmissive solid has a property of radiating the heat generated in the thermoplastic resin film by the infrared beam that has passed through the infrared transmissive solid.

The infrared beam may exhibit a spot-like spot having a light intensity sufficient for welding and move at high speed on the surface of the thermoplastic resin film laminate.

The infrared beam may exhibit a linear spot having a light intensity sufficient for welding and move at high speed on the surface of the thermoplastic resin film laminate.

The infrared beam may exhibit a planar spot having a light intensity sufficient for welding.

FIG. 3 shows a basic embodiment of the present invention. First, an opaque pigment is applied to one side of the transparent thermoplastic resin film to form a pigment-coated thermoplastic resin film 33. Here, the thermoplastic resin film transmits an infrared beam of 0.7 μm or more and less than 2.0 μm well, but the opaque pigment applied to the thermoplastic resin film transmits an infrared beam of 0.7 μm or more and less than 2.0 μm very well. Use.

  Next, the second dye-coated thermoplastic resin film 33 is superposed on the first dye-coated thermoplastic resin film 33 to form a thermoplastic resin film polymerized body. This thermoplastic resin film polymerized body is placed on a support 34 and an infrared transmitting solid 35 is superposed thereon to form a thermoplastic resin film laminate. Further, the thermoplastic resin film laminate is pressed in the direction of polymerization and irradiated with an infrared beam 36 from the infrared transmitting solid 35 side to form a thermoplastic resin film welded body, and the infrared transmitting solid 35 is removed and the thermoplastic resin is removed. A third dye-coated thermoplastic resin film 33 is superposed on the film welded body to form a thermoplastic resin film laminate. The steps from the step of forming a thermoplastic resin film laminate from the thermoplastic resin film polymerized body to the step of superposing the dye-coated thermoplastic resin film on the thermoplastic resin film welded body are repeated as many times as necessary.

  Here, the “required number of times” refers to the number of times until the total size in the superposition direction of the thermoplastic resin film welded body becomes at least equal to the size of the screen to which the protective film is applied.

  The infrared light source for generating an infrared beam in the present invention generates an infrared beam having a wavelength in a range of 0.7 μm or more and less than 2.0 μm, and the weld surface of the thermoplastic resin film is brought to a melting temperature by irradiation with the infrared beam. Those that generate a wavelength and output that can be sufficiently heated are selected.

  As the infrared light source, either an infrared lamp or an infrared laser may be used. Examples of the infrared lamp include a halogen lamp or a xenon lamp that generates an infrared beam having a wavelength of 07 μm or more. On the other hand, as the type of infrared laser, any of solid laser, semiconductor laser, gas laser, dye laser, and chemical laser that generates an infrared beam in the above wavelength range may be used. More specifically, YAG laser, semiconductor laser, fiber laser and the like can be mentioned.

As the infrared transmitting solid, quartz (SiO ₂ ), calcium fluoride (CaF ₂ ), barium fluoride (BaF ₂ ), sapphire (Al) having high transmittance in the wavelength range of 0.7 μm or more and less than 2.0 μm. Infrared crystal materials such as ₂ O ₃ ) or gallium arsenide (GaAs).

The present invention can be widely used in the field of information terminal manufacturing.

It is a model figure which shows the principle of the screen protection film for information terminal peep prevention. It is a model figure which shows the conventional manufacturing process of the screen protection film for information terminal peep prevention. It is a model figure which shows the manufacturing process of the screen protection film for information terminal peep prevention by this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Screen 2 Protective film 21 Transparent thermoplastic resin film 22 Opaque pigment | dye 23 Laminated body 33 Dye application | coating thermoplastic resin film 34 Support body 35 Infrared transparent solid 36 Infrared beam

Claims (6)

(A) An opaque pigment is applied to one side of the transparent thermoplastic resin film to form a pigment-coated thermoplastic resin film (33), and (b) a second pigment-coated thermoplastic resin film (33) is formed on the second pigment-coated thermoplastic resin film (33). Dye-coated thermoplastic resin film (33) is superposed to form a thermoplastic resin film polymerized body. (C) The thermoplastic resin film polymerized body is placed on the support (34), and infrared rays are transmitted thereover. The thermoplastic resin film laminate is formed by superimposing the solid (35), and (d) the infrared beam (36) from the infrared transmitting solid (35) side in a state where the thermoplastic resin film laminate is pressurized in the polymerization direction. To form a thermoplastic resin film welded body, and (e) the third dye-applied FF (33) is superposed on the thermoplastic resin film welded body except for the infrared transmitting solid (35), and the thermoplastic resin is laminated. Phi Forming a beam laminate, (f) following step (c) ~ manufacturing method of preventing screen protective film peeping information terminal and repeating a necessary number of times the (e). The method according to claim 1, wherein the infrared transmitting solid exhibits a property of transmitting an infrared beam absorbed by the thermoplastic resin film. The method according to claim 1, wherein the infrared transmissive solid exhibits a property of sufficiently releasing heat generated in the thermoplastic resin film by an infrared beam that has passed through the infrared transmissive solid. The method according to claim 1, wherein the infrared beam exhibits a spot-like spot having a light intensity sufficient for welding and moves at a high speed on the surface of the FF laminate. The method according to claim 1, wherein the infrared beam exhibits a linear spot having a light intensity sufficient for welding and moves at high speed on the surface of the FF laminate. The method according to claim 1, wherein the infrared beam exhibits a planar spot having a light intensity sufficient for welding.

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