JP2006225570A - Method for producing luminescent parts - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a luminescent parts that is furnished with an inner layer and an outer layer having respective different refractive indexes. <P>SOLUTION: The method for producing a luminescent parts 1 comprises irradiating at least one part of the surface of a longitudinal parts 4 made of amorphous plastics with laser ray to crystallize the surface layer of the longitudinal parts 4, wherein the crystallized surface layer is called an outer layer 3, and the remaining part that is exempted from crystallization is called an inner layer 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for manufacturing a light emitting member that constitutes a lighting device or the like.

  2. Description of the Related Art Conventionally, as a lighting device that replaces a fluorescent lamp lighting device including a glass component (for example, a vacuum discharge glass tube), a lighting device including a plastic component has been provided. Lighting devices made of plastic parts are attracting attention because they have the advantage of being more resistant to vibration than conventional lighting devices and being easy to mold into complex shapes.

  As the plastic part, for example, a flexible rod member formed of a light-transmitting plastic material and a light irradiation rod having a light diffusion reflection film on the outer peripheral surface of the rod member are provided (see Patent Document 1). ). The light irradiation rod has an advantage that it is difficult to break compared to a vacuum discharge glass tube such as a fluorescent tube.

Japanese Patent Laid-Open No. 10-142428

  In the light irradiation rod of Patent Document 1, it is considered that the light diffusing reflection film is formed on the entire outer peripheral surface of the light transmissive plastic. For example, the light diffusing reflection of a predetermined shape is formed on the outer peripheral surface of the light transmissive plastic. Partial formation of the film is not considered. The light irradiation rod of Patent Document 1 is manufactured by coating a light diffusive reflection film containing an adhesive polymer on the outer peripheral surface of a light transmissive plastic. Therefore, it is necessary to consider the adhesive property (for example, control of the content of the adhesive polymer in the light diffusive reflective film).

  Therefore, the present invention provides a light emitting member manufacturing method comprising an inner layer made of amorphous plastic and an outer layer made of crystalline plastic as means for solving the above-mentioned problem, and the surface of a longitudinal member made of amorphous plastic There is provided a method for producing a light emitting member, wherein at least a part of the material is irradiated with a laser to crystallize a surface layer of a longitudinal member to form an outer layer.

  The present invention also relates to a method for producing a light emitting member comprising an inner layer made of amorphous polylactic acid plastic and an outer layer made of crystalline polylactic acid plastic, wherein at least the surface of the longitudinal member made of amorphous polylactic acid plastic Provided is a method for manufacturing a light-emitting member, characterized in that a part is irradiated with a laser to crystallize the surface layer of a longitudinal member to form an outer layer.

  Furthermore, the present invention relates to a method for manufacturing a light emitting member comprising an inner layer made of amorphous plastic and an outer layer made of crystalline plastic, wherein the longitudinal member made of amorphous plastic is used as the inner layer, and the inner layer has a non-coated surface. Provided is a method for manufacturing a light emitting member, characterized in that a plastic having compatibility with a crystalline plastic is coated to form an outer layer, and at least a part of the surface of the outer layer is irradiated with a laser to crystallize the plastic. To do.

  Furthermore, the present invention relates to a method for producing a light emitting member comprising an inner layer made of polymethyl methacrylate and an outer layer made of crystalline polylactic acid plastic, wherein the longitudinal member made of polymethyl methacrylate is used as an inner layer, and the surface of the inner layer is made of poly Provided is a method for producing a light emitting member, characterized in that a lactic acid plastic is coated to form an outer layer, and at least a part of the surface of the outer layer is irradiated with a laser to crystallize the polylactic acid plastic.

  According to this invention, the manufacturing method of the light emitting members 1 and 11 which have the outer layers 3 and 13 of a desired shape can be provided. Moreover, according to this invention, the manufacturing method of the light emitting member 1 which the adhesion process of the inner layer 2 and the outer layer 3 is unnecessary can be provided.

  Hereinafter, this embodiment of the present invention will be described.

  A light emitting member 1 shown in FIG. 1 includes an inner layer 2 made of amorphous plastic and an outer layer 3 made of crystalline plastic. In the light emitting member 1, the outer layer 3 is formed by irradiating the surface of the longitudinal member 4 made of amorphous plastic with a laser to crystallize the surface layer of the longitudinal member 4.

  The amorphous plastic used in this embodiment is a plastic in an amorphous state, and is crystallized by laser irradiation, heating, or the like to become a crystalline plastic (crystalline plastic).

  Examples of amorphous plastics include polyethylene (including ultra-high molecular weight polyethylene), polypropylene, polyamide, syndiotactic polystyrene, polyacetal, polybutylene terephthalate, polyethylene terephthalate, polymethylpentene, polyphenylene sulfide, polyether ether ketone, and liquid crystal polymer. (LCP), polytetrafluoroethylene, polyether nitrile, fluororesin, polylactic acid plastic, and the like.

  As long as the effects of the present invention are not impaired, the light-emitting members 1 and 11 of the present invention have desired additives, for example, coloring materials such as pigments and dyes, ultraviolet absorbers, heat stabilizers, plasticizers, antioxidants, and the like. May be blended.

  Hereinafter, the manufacturing method of the light emitting member 1 of the present embodiment will be described step by step. First, a cylindrical longitudinal member 4 made of an amorphous plastic as shown in FIG. 2 is prepared. The longitudinal member 4 can be manufactured by a known plastic molding method such as extrusion molding.

  The longitudinal member 4 of this embodiment is a longitudinal member 4A made of amorphous polylactic acid plastic. Polylactic acid plastic has a feature of being easily crystallized by a treatment such as laser irradiation or heating, and is a preferable material. Polylactic acid plastic is also a biodegradable plastic, and if it is buried in the ground at the time of disposal, it is decomposed in the ground, so it is also an environmentally friendly material.

  As shown in FIG. 3, the surface of the longitudinal member 4 is irradiated with a laser from a predetermined laser device 5 to crystallize the surface layer of the longitudinal member 4. The wavelength of the laser to be irradiated is appropriately selected depending on the type of amorphous plastic used for the longitudinal member 4. For example, when the amorphous polylactic acid plastic longitudinal member 4A is used as in this embodiment, a laser having a wavelength of 800 nm to 1100 nm is used. At the time of laser irradiation, the crystallinity of the outer layer is adjusted by appropriately adjusting the laser irradiation time, the laser intensity, and the like.

  In order to irradiate laser on a predetermined portion of the surface of the longitudinal member 4, for example, one end of the longitudinal member 4 is first fixed by a predetermined fixing means 6. The fixing means 6 is connected to a predetermined rotating device (not shown), and the fixing means 6 also rotates in conjunction with the movement of the rotating device. The longitudinal member 4 fixed by the fixing means 6 advances in the direction of arrow A in the figure while rotating. Thus, the outer layer 3 of the light emitting member 1 is formed by crystallizing the surface layer portion of the longitudinal member 4 irradiated with the laser.

  As a method for crystallizing the surface layer of the longitudinal member 4, the longitudinal member 4 is stopped, the laser device 5 is moved around the surface of the longitudinal member 4, etc. May be crystallized.

  When the light emitting member 1 manufactured as described above is irradiated with light from a light source from one end, the light is reflected in the inner layer 2 of the light emitting member 1 while repeating reflection while emitting appropriate scattered light to the other end. To reach. The outer layer 3 and the inner layer 2 of the light emitting member 1 are made of the same material (for example, polylactic acid plastic in the above case), but have different crystal states. The outer layer 3 is in a crystalline state, while the inner layer 2 is in an amorphous state. Therefore, a difference in refractive index between the outer layer 3 and the inner layer 2 occurs, and light is reflected at the interface generated between the outer layer 3 and the inner layer 2.

  For example, as shown in FIG. 4, the light emitting member 1 manufactured as described above is provided with a lead terminal cap 7 at one end and an end cap 8 at the other end, and is used in a lighting device. The lead terminal cap 7 contains a light source (not shown), and the end cap 8 contains a reflecting mirror (not shown).

  When a light source is provided on the light emitting member 1, it may be provided only at one end of the light emitting member 1, or a light source may be provided at both ends of the light emitting member 1. As the light source, a high-intensity lamp such as a xenon lamp, a halogen lamp, or a flash lamp, or a known light source such as a light emitting diode can be used.

  The light emitting member 1 of the present embodiment has an advantage that the bonding step of separately manufacturing the inner layer and the outer layer and bonding them is unnecessary.

  The light emitting member 1 of the present embodiment has an outer layer 3 made of a plastic material in which at least a part of its surface is crystallized. Therefore, the light emitting member 1 of the present embodiment may have the outer layer 3 made of a plastic whose surface is entirely crystallized. For example, as shown in FIG. It may have an outer layer 3a, 3b, 3c, 3d made of crystallized plastic. In addition, each light emitting member 1 shown in FIG. 5 is obtained by partially crystallizing the surface layer of the columnar longitudinal member 4.

  In the above embodiment, instead of laser irradiation, the longitudinal member 4 may be heat-treated with a predetermined heating device to crystallize the surface of the longitudinal member 4.

  In the above embodiment, a cylindrical member is used as the longitudinal member 4, but is not limited thereto, and may be, for example, a prismatic or triangular prism-shaped member, or a longitudinal member having an elliptical cross section. Also good.

  In the above embodiment, a longitudinal member set in advance to a predetermined length may be crystallized to be used as a light emitting member as it is, or a longitudinal member having a predetermined length may be partially crystallized so that the longitudinal member is predetermined. You may use what was cut | disconnected to length of as a light emitting member. For example, using a longitudinal member having a diameter of 5 mm and a length of 3 m, the surface of the longitudinal member is irradiated with a laser to form an outer layer, and the obtained layer is cut every 50 cm to prepare a light emitting member having a length of 50 cm. May be.

  Still another embodiment of the light emitting member 11 includes a light emitting member 11 including an inner layer 12 made of amorphous plastic and an outer layer 13 made of crystalline plastic.

  The light emitting member 11 is manufactured by coating the surface of the longitudinal member 14 made of an amorphous plastic with another plastic, and irradiating the surface of the coated plastic with a laser to crystallize the plastic. In addition, as a plastic coat | covered on the surface of the longitudinal member 14 which consists of an amorphous plastic, it is preferable that it is a plastic compatible with an amorphous plastic.

  Here, the non-crystalline plastic used for the inner layer 12 of the light emitting member 11 of the present embodiment is a plastic that does not crystallize even by laser irradiation, heat treatment, or the like. An amorphous plastic is a plastic that does not crystallize even by laser irradiation or heat treatment. Examples of the amorphous plastic used for the inner layer 12 of the present embodiment include polycarbonate and polymethyl methacrylate.

  Moreover, the crystalline plastic used in the light emitting member 1 of the above embodiment can be used as the crystalline plastic used for the outer layer 13 of the light emitting member 11 of the present embodiment.

  For example, when the inner layer 12A is made of polymethyl methacrylate and the outer layer 13A is made of crystalline polylactic acid plastic, the light emitting member 11 of the present embodiment is manufactured as follows. First, a longitudinal member 14A made of polymethyl methacrylate is prepared, and the surface of the longitudinal member is coated with polylactic acid plastic. In addition, what is manufactured by well-known manufacturing methods, such as extrusion molding, can be used as 14 A of longitudinal members. Since polylactic acid plastic and polymethyl methacrylate are compatible, the polylactic acid plastic can be directly adhered to polymethyl methacrylate without performing any special adhesion treatment. Next, the polylactic acid plastic coated with the longitudinal member 14A is irradiated with a laser to crystallize the polylactic acid plastic. The portion of the crystallized polylactic acid plastic becomes the outer layer 13A of the resulting light emitting member. The light emitting member 11 can be used as an illumination member because light is reflected at the interface between the outer layer 13A and the inner layer 12A and emits moderate scattered light.

  In this embodiment as well, the light emitting member 11 in which the outer layer is partially formed can be manufactured as in the above embodiment. As in the above embodiment, the outer layer may be formed by heat treatment instead of laser irradiation.

  The light emitting members 1 and 11 of the present invention can be used as a light emitting member of a lighting device or a light emitting member of a decorative lighting fixture.

The perspective view of the light emitting member of this embodiment is shown. The perspective view of a longitudinal member is shown. The schematic of the process of irradiating the surface layer of a longitudinal member with a laser and crystallizing is shown. Explanatory drawing of the state which attached the light source etc. to the light emitting member is shown. Explanatory drawing of the light emitting member which has the outer layer of various aspects is shown. The perspective view of the light emitting member of other embodiment is shown. The perspective view of the elongate member used as an inner layer of the light emitting member of other embodiment is shown.

Explanation of symbols

  1, 1A light emitting member, 2, 2A inner layer, 3, 3A outer layer, 4, 4A longitudinal member, 5 laser device, 6 fixing means, 11, 11A light emitting member, 12, 12A inner layer, 13, 13A outer layer, 14, 14A longitudinal Element.

Claims (4)

  A method of manufacturing a light emitting member comprising an inner layer made of amorphous plastic and an outer layer made of crystalline plastic, wherein at least part of the surface of the longitudinal member made of amorphous plastic is irradiated with a laser, A method for producing a light-emitting member, characterized by crystallizing a surface layer to form an outer layer.   A method for producing a light emitting member comprising an inner layer made of amorphous polylactic acid plastic and an outer layer made of crystalline polylactic acid plastic, wherein at least a part of the surface of the longitudinal member made of amorphous polylactic acid plastic is irradiated with laser Then, the outer layer is formed by crystallizing the surface layer of the longitudinal member.   A method for manufacturing a light emitting member comprising an inner layer made of amorphous plastic and an outer layer made of crystalline plastic, wherein the inner layer is a longitudinal member made of amorphous plastic, and is compatible with the amorphous plastic on the surface of the inner layer A method for producing a light-emitting member, comprising forming an outer layer by coating a plastic having a material, and irradiating at least a part of the surface of the outer layer with a laser to crystallize the plastic. A method of manufacturing a light emitting member comprising an inner layer made of polymethyl methacrylate and an outer layer made of crystalline polylactic acid plastic, wherein a longitudinal member made of polymethyl methacrylate is used as an inner layer, and the surface of the inner layer is coated with polylactic acid plastic A method for producing a light-emitting member, comprising forming an outer layer and irradiating at least part of the surface of the outer layer with a laser to crystallize polylactic acid plastic.

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