JP2012121159A - Light-guide type decorative resin mold and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-guide type decorative resin mold which maintains the beautiful appearance of a product and prevents the non-intended leakage of light from a light source arranged inside, and to provide its manufacturing method.SOLUTION: The light-guide type decorative resin mold 1 includes a translucent resin layer 4 which is formed in a plate having translucency as a primary side resin layer; a non-translucent resin layer 5 which is integrally formed at the rear side of the translucent resin layer 4 as a secondary side resin layer and has non-translucency that prevents the light from leaking to the rear side of the translucent resin layer 4; and a non-translucent sheet material 3 which is formed as to cover an area except an area which leaks the light to the outside of a translucent resin to constitute a decorative design side, has non-translucency that prevents the light from leaking from an area except the area which leaks the light, and is located so that a tip 6 turns to the side of the non-translucent resin layer 5. The non-translucent sheet material 3 encloses the translucent resin layer 4 with the non-translucent resin layer 5 from the outside so that the tip 6 overlaps with the non-translucent resin layer 5.

Description

  The present invention relates to a light guide type decorative resin molded product by injection molding and a method for manufacturing the same.

  Conventionally, display parts and operation panel parts of household electrical appliances molded from multiple resin layers are covered with a film-like sheet material in which the surface is a design surface and characters and patterns are printed in a predetermined area. Light from a light source disposed on the back side of the sheet material can be transmitted and guided to a predetermined region of the sheet material. Thereby, it can visually recognize as if the character and pattern of a sheet material are shining. This is known as the prior art as in Patent Document 1, and a film obtained by injecting molten resin into the mold in a state in which a sheet material (film) is arranged in advance in the mold, and forming two colors. Insert-molded (in-mold molded) products, resin having a light-transmitting property so that light from a light source can be transmitted and a resin having a light-transmitting property that cannot transmit light are used as appropriate. .

  In Patent Document 1, film insert molding (in-mold molding) in which a molten resin is injected into a mold in a state where a film-like sheet material is arranged in advance in a mold, different multilayer resins are applied. Two-color molding is used. In order to obtain a molded product by this method, as shown in FIG. 18A, the front end surface 201 of the sheet material 200 is aligned with the edge of the upper mold 202, and as shown in FIG. At this time, it is desirable to inject the primary side resin 204 as shown in FIG. However, in this case, the sheet material 200 is stretched by the primary side resin 204, and a bend 205 is formed in the middle. The bend 205 is wrinkled, and the appearance of the product cannot be kept beautiful.

  Therefore, in order to absorb the bending 205, as shown in FIG. 19A, the front end of the sheet material 200 is shortened in advance so that the front end surface 201 does not abut against the lower mold 203 during mold clamping. Thus, a method of placing the upper mold 202 is conceivable. However, as shown in FIG. 19B, since the leading end surface 201 of the sheet material 200 does not reach the lower mold 203 during mold clamping, as shown in FIG. When injection is performed by injection, the side surface 206 of the primary side resin 204 is slightly exposed. In this state, as shown in FIG. 20, when a non-transparent secondary resin 207 is injection-molded on the back surface of the primary resin 204 and a light source 208 is disposed on the back surface side of the sheet material 200, the light source 208 From the exposed side surface 206 of the primary side resin 204 leaks as unintended light.

  On the other hand, as shown in FIG. 21 (a), when the mold is clamped in a state in which the leading end portion 209 of the sheet material 200 is long due to the variation in the cut of the sheet material 200, the leading end thereof is shown in FIG. The part 209 is sandwiched, resulting in a product defect.

JP-A-6-134805

  The present invention has been made in view of the above circumstances, and is a light guide type decorative resin molding that can keep the appearance of a product beautiful and prevent unintentional leakage of light from a light source disposed inside. It is to provide a product and a manufacturing method thereof.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the light guide type decorative resin molded product of the present invention is:
Light-guided decoration that has a decorative design surface, guides light emitted from an internal light source through the resin to a predetermined region of the decorative design surface, and leaks light in that region to provide a design effect A resin molded product,
A translucent resin layer formed in a plate shape having translucency as the primary side resin layer;
A non-translucent light-transmitting material that is integrally formed on the back surface side of the translucent resin layer as a secondary resin layer and prevents the light from leaking to the back surface side of the translucent resin layer. A conductive resin layer;
The outer surface of the translucent resin layer is formed so as to cover the area except for the area where light is leaked to form the decorative design surface, and leakage of light from areas other than the area where light is leaked is prevented. A translucent sheet material that is translucent and that is positioned so that the tip portion wraps around the translucent resin layer,
The translucent sheet material surrounds the translucent resin layer from the outside together with the translucent resin layer in a form in which the front end portion overlaps the translucent resin layer. And

  In this way, in the case where the sheet material is integrated with the light-transmitting resin layer and the light-impermeable resin layer, the sheet material overlaps the light-impermeable resin layer, so that the front end of the sheet material Since the portion is not defined, wrinkles (sag) are not generated in the sheet material, and the appearance of the molded product can be made beautiful. Further, since the light-transmitting sheet material surrounds the light-transmitting resin layer together with the light-transmitting resin layer from the outside, it is possible to prevent light from the internal light source from leaking from other than a predetermined region. .

  In the present invention, the front end portion of the light-impermeable sheet material enters the light-impermeable resin layer, and the front surface of the sheet material is not exposed to the outside. .

  In this way, the translucent sheet material and the translucent resin layer securely cover the translucent resin layer so that the translucent resin layer is not exposed. Can be prevented.

In the present invention, the light-impermeable resin layer is formed integrally with a part of the back surface side and the side surface side of the light-transmissive resin layer,
The translucent resin layer and the translucent resin layer are positioned on the back side of the decorative design surface formed of the translucent sheet material.

  In this way, the translucent resin layer and the translucent sheet material can be formed so as to surround the translucent resin layer, thereby preventing light leakage from other than a predetermined region. Can do.

  Further, in the present invention, a cavity that reaches the translucent resin layer is formed in the opaque resin layer, the light source is disposed in the cavity, and the opaque sheet material includes: A light transmission part that forms the region for leaking light on the decorative design surface is provided, and light from the light source is leaked to the outside from the light transmission part.

  Further, in the present invention, the light-transmitting sheet material includes a light-transmitting printing surface on the front surface or the back surface of the light-transmitting material sheet, and the light transmitting portion is formed by a non-printing portion of the printing surface. The light from the light source passes through the transparent material sheet and leaks outside.

  If it does in this way, a light source can be arrange | positioned in the multilayer resin integrated. In addition, since the light from the light source can be leaked from the light transmitting portion formed on the light-impermeable sheet material, for example, if the character / pattern is a light transmitting portion, the character / pattern of the sheet material is changed. It can be visually recognized as if it is emitting light.

  Further, in the present invention, the translucent resin layer formed integrally with the translucent resin layer located around the translucent sheet material is provided with the translucency on the side. A translucent resin member is disposed adjacent to the side surface of the sheet material, a second light source is disposed in a recess formed on the back surface of the translucent resin member, and the second light source from the translucent resin member. Light from the outside is leaked to the outside.

  If it does in this way, when it applies to the operation panel part of an electric appliance, for example, it can be set as the accent which light-emits as a display part.

  Further, in the present invention, the translucent resin member is movably disposed adjacent to a side surface of the sheet material, the translucent resin member has a switch disposed on the back surface side, and the translucent resin The switch is operated by a member.

  If it does in this way, when it applies, for example to the operation panel part etc. of electrical appliances, switch operation by pushing down of the translucent resin member which emitted light will be attained.

Moreover, the method of producing the light guide type decorative resin molded product of the present invention is as follows.
Light-guided decoration that has a decorative design surface, guides light emitted from an internal light source through the resin to a predetermined region of the decorative design surface, and leaks light in that region to provide a design effect A method of manufacturing a resin molded product,
An opaque sheet material that forms a decorative design surface on the outer surface and prevents light leakage from a region other than the light leakage region is disposed so that the surface thereof is along the inner surface of the cavity of the mold. Sheet material placement process;
A primary molding step of injecting a primary side resin into the cavity and integrally molding a plate-like translucent resin layer having translucency on the back surface of the sheet material;
A secondary side resin is injected further into the back side of the intermediate molded product in which the translucent resin layer is integrally formed on the back side of the sheet material, and is not applied to the back side of the translucent resin layer in the intermediate molded product. A secondary molding step of integrally molding the translucent resin layer,
The sheet is formed so that a front end portion of the light-transmitting sheet material overlaps the light-transmitting resin layer and surrounds the light-transmitting resin layer together with the light-transmitting resin layer. At least one of a material arranging step and the primary forming step is performed.

  Furthermore, in the manufacturing method of the present invention, in the secondary molding step, the intermediate molded product after the primary molding step is placed in a mold for secondary molding as an insert material, and the mold is clamped. A cavity portion corresponding to the opaque resin layer as the secondary resin is formed on the back surface side of the intermediate molded product, and the secondary resin is injected into the cavity portion, and the back surface side of the intermediate molded product The opaque resin layer is integrally formed by insert molding.

  In this way, when the light-transmitting resin layer and the light-impermeable resin layer are injected and integrated with respect to the sheet material, the front end portion of the sheet material overlaps the light-impermeable resin layer. Wrinkles (sagging) do not occur in the sheet material, and the appearance of the molded product, particularly the side surface of the molded product can be made beautiful. Further, since the light-transmitting sheet material surrounds the light-transmitting resin layer together with the light-transmitting resin layer from the outside, it is possible to prevent light from the internal light source from leaking from other than a predetermined region. .

Further, in the manufacturing method of the present invention, the molds clamped to mold the intermediate molded product in the primary molding step are the first mold and the second mold, and the sheet material is the first mold. Arranged along the inner surface of the cavity, the primary molding step is performed by the first and second molds as insert molding of the sheet material,
In the secondary molding step, the first and second molds are opened while the intermediate molded product after the primary molding step is held in the first mold, and further replaced with the second mold. The third mold and the first mold are clamped to form a cavity portion corresponding to the light-impermeable resin layer as the secondary resin on the back side of the intermediate molded product. A secondary side resin is injected into the portion, and the light-impermeable resin layer is integrally formed on the intermediate molded product by two-color molding.

  If it does in this way, it will become possible to manufacture the 2 color molded product by which a non-translucent resin layer is arrange | positioned on the back surface side of the intermediate molded product which consists of a sheet | seat material and a translucent resin layer.

  Further, in the manufacturing method of the present invention, the second mold is disposed so as to face the back surface of the sheet material from the front surface to the side surface side, and the primary molding step is a part of the sheet material. The primary side resin is injection-molded on the back surface.

  In this way, since the primary side resin can be injection-molded only on a part of the back surface of the sheet material, the degree of freedom in product design is increased.

  In the manufacturing method of the present invention, a gap is formed between the back surface of the sheet material and the second mold facing the back surface so as to stop the outflow of resin and allow the passage of air.

  In this way, excess air in the mold is pushed out, but the resin does not flow out, so even if the sheet is stretched due to the resistance of the injected fluid resin, wrinkles (deflection) do not occur, and the appearance of the product Can keep you beautiful.

The perspective view which shows an example of the state which applied the light guide type decorative resin molded product of this invention. FIG. 3 is a partially enlarged sectional view partially showing the light guide type decorative resin molded product of FIG. 2 as Example 1; FIG. 4 is a partial enlarged cross-sectional view showing a modification of FIG. FIG. 6 is a partial cross-sectional view showing an example in which an opaque printing surface is applied to the back surface of a sheet material as Example 3. FIG. 6 is a partial enlarged cross-sectional view illustrating an example in which a translucent resin member is disposed as Example 4. The partial expanded sectional view which shows the manufacturing method of a light guide type decorative resin molded product. The partial expanded sectional view following FIG. The partial expanded sectional view following FIG. The partial expanded sectional view following FIG. The partial expanded sectional view following FIG. FIG. 11 is a partial enlarged cross-sectional view following FIG. 10. FIG. 12 is a partially enlarged cross-sectional view showing another manufacturing method of FIGS. The partial expanded sectional view following FIG. FIG. 14 is a partial enlarged cross-sectional view subsequent to FIG. 13. The partial expanded sectional view following FIG. The partial expanded sectional view following FIG. The partial expanded sectional view following FIG. The partial expanded sectional view which shows the manufacturing method of the conventional light guide type decorative resin molded product. The partial expanded sectional view which shows the other manufacturing method of FIG. The partial expanded sectional view which shows the conventional light guide type decorative resin molding obtained by the manufacturing method of FIG. FIG. 21 is a partial enlarged cross-sectional view illustrating a manufacturing method other than that of FIGS. 19 and 20.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an example of a state in which a light guide type decorative resin molded product 1 of the present invention is applied.

  As shown in FIG. 1, the light guide type decorative resin molded product 1 of the present invention has an outer surface as a decorative design surface, and allows light emitted from an internal light source to pass through the resin so that a predetermined value on the decorative design surface is obtained. It induces to an area and leaks light in the area to produce a design effect, and is applied to the operation panel unit 101 of the home appliance 100 such as an electronic rice cooker. The operation panel unit 101 is formed with characters indicating a function and operation guidance such as “rice cooking” corresponding to the predetermined area, a pattern expressing a design, and the like. Although not shown, a translucent resin layer having translucency, a translucent resin layer having translucency, and a light source are arranged on the back side of the operation panel unit 101.

  Hereinafter, the light guide type decorative resin molded product 1 of the present invention will be described more specifically. 2 to 5 show only a main part of the light guide type decorative resin molded product 1 in an enlarged manner for easy understanding of the explanation, and the whole is omitted.

Example 1
As shown in FIG. 2, the light guide type decorative resin molded product 1 includes a translucent resin layer 4 formed in a plate shape having translucency as a primary side resin layer and a translucent resin layer as a secondary side resin layer. A translucent resin layer 5 which is integrally formed on the back surface side of the light transmissive resin layer 4 and has a light transmissive property to prevent light from leaking to the back surface side of the translucent resin layer 4; Non-translucent light that prevents the leakage of light from regions other than the region that leaks the light by forming the decorative design surface to cover the outer surface of the conductive resin layer 4 except the region that leaks the light And a translucent sheet material 3 that is positioned so that the front end portion 6 wraps around the translucent resin layer 5 side. The translucent sheet material 3 surrounds the translucent resin layer 4 from the outside together with the translucent resin layer 5 in such a form that the front end portion 6 overlaps the translucent resin layer 5.

  Further, the light guide type decorative resin molded product 1 corresponds to the operation panel unit 101 of FIG. 1 with the surface and side surface side being a decorative design surface, and a sheet material 3 having a thickness of, for example, about 0.5 mm is disposed on the surface. The Further, the front end portion 6 of the sheet material 3 enters the opaque resin layer side 5 so that the front end surface 7 of the sheet material 3 is not exposed to the outside.

  The sheet material 3 is opaque, and for example, a PET (polyethylene terephthalate) film having a thickness of about 0.1 mm to 1.0 mm, a PC (polycarbonate) film, or the like is used. The light transmissive resin layer 4 is made of a resin having a light transmissive property, such as an acrylic resin, a polyester resin, or a polycarbonate resin. The opaque resin layer 5 is made of, for example, an ABS (acrylonitrile / butadiene / styrene copolymer) resin, which is a resin having an opaque property.

  Further, a cavity 8 that reaches the translucent resin layer 4 is formed in the opaque resin layer 5, and a light source 9 such as an LED is disposed in the cavity 8. The hollow part 8 should just have the magnitude | size which can arrange | position the light source 9 at least, and can be suitably formed in the form straddling the translucent resin layer 4 and the opaque resin layer 5.

  As the decorative design surface, for example, characters and patterns are arranged on the sheet material 3, but the sheet material 3 shown in FIG. 2 is provided with a light transmitting portion 2 that forms a region for leaking light on the decorative design surface. . Since the sheet material 3 is formed of an opaque material, the light transmitting portion 2 is formed as an opening window having a light transmitting property, for example, by laser etching or the like. The light transmitting portion 2 has, for example, characters such as “cooking rice”, a pattern, or the like that shows the function of the product as shown in FIG. This character / pattern is formed so that, for example, the character portion is cut out and the character is lifted. As a result, the light from the light source 8 is exposed to the outside by the light transmitting portion 2, and the character / pattern is emitted. Looks like.

  Moreover, the edge part of the upper surface part 10 which forms the surface of the sheet | seat material 3 makes the form which the sheet | seat material 3 bend | folds, forms the bending part 11, and is connected to the side part 12 from there. The plate-like translucent resin layer 4 is located in all the portions of the sheet material 3 that are in contact with the upper surface portion 10, the bent portion 11, and the side surface portion 12. About the front-end | tip part 6 of the sheet | seat material 3, since it shape | molds so that it may penetrate into the opaque resin layer 5 of the back surface side of the translucent resin layer 4, the front end surface 7 of the sheet | seat material 3 is not exposed outside. That is, the sheet material 3 and the opaque resin layer 5 are overlapped and covered so as not to expose the transparent resin layer 4.

  If it does in this way, as shown by the arrow represented in FIG. 2, when the light from the light source 9 was guided in the translucent translucent resin layer 4, it was formed in the sheet material 3. The light transmissive portion 2 is exposed to the outside to display characters / patterns, and other than the light transmissive portion 2 is blocked by the sheet material 3 and the light transmissive resin layer 5 made of a light transmissive material, All the light from the light source 9 is exposed from the light transmitting portion 2. Therefore, unlike the prior art, there is no risk of exposure from the side portion where the translucent resin layer 4 is exposed, so that unintended exposure from the end of the light guide type decorative resin molded product 1 can be avoided. Further, the front end portion 6 on the side surface side of the sheet material 3 is extended from the translucent resin layer 4 so that the front end surface 7 enters the non-translucent resin layer 5 and is not exposed to the outside. Therefore, wrinkles (sag) do not occur in the sheet material 3, and the appearance of the product can be made beautiful.

  Hereinafter, other examples of the light guide type decorative resin molded product 1 described in the first embodiment will be described as the second to fourth embodiments. In addition, about the part already demonstrated above, a common code | symbol is attached | subjected and description is abbreviate | omitted.

(Example 2)
As shown in FIG. 3, the light-impermeable resin layer 5 of the light-guided decorative resin molded product 1 is formed integrally with a part of the back surface side and the side surface side of the light-transmissive resin layer 4. A translucent resin layer 4 and a non-translucent resin layer 5 are located on the back side of the decorative design surface constituted by the translucent sheet material 3. At this time, as a preferable form, the non-translucent resin layer 5 has an inclined surface 22 from the upper surface 21 in contact with the lower surface of the translucent resin layer 4 toward the upper surface portion 10 of the sheet material 3.

  If it does in this way, the inclined surface 22 of the non-translucent opaque resin layer 5 becomes a wall, and the light of the light source 9 which is going to be guided other than the light transmissive part 2 is interrupted | blocked reliably. Can do. Therefore, the exposure from the side surface side in the light guide type decorative resin molded product 1 can be further prevented. Moreover, even if the resin of the translucent resin layer 4 is a small amount, the light guide type decorative resin molded product 1 can be manufactured.

(Example 3)
As shown in FIG. 4, the sheet material 3 of the light guide type decorative resin molded product 1 includes a translucent printing surface 25 on the back surface thereof as a translucent material sheet 24, and a non-printing portion of the printing surface 25. Thus, the light transmission part 2 can be formed. The light from the light source 9 passes through the transparent material sheet 24 and leaks outside. That is, the translucent material sheet 24 is arranged on the front surface side which becomes the decorative design surface of the product, and the non-transparent character / pattern or the like is printed on the back surface thereof. Specifically, the character / pattern is opaque at the periphery, and the opaque character / pattern is printed in the transparent portion surrounded by the opaque portion.

  In addition, the translucent performance of the translucent resin layer 4 is not completely transparent, and a material that transmits light while being scattered is used. For this reason, the translucent resin layer 5 is transferred to the translucent resin layer 4. A reaching cavity 8 is formed, and a light source 9 is arranged in the cavity 8. The light from the light source 9 scatters and brightens the translucent resin layer 4 so that it looks like a backlight panel, and the opaque characters / patterns can be clearly seen. At this time, the translucent material sheet 24 on the side surface side of the light guide type decorative resin molded product 1 is rendered impermeable by printing, but the front end surface 7 of the printed sheet material 3 is impermeable. Since it is in the light-sensitive resin layer 5, the light from the light source 9 does not leak from the side surface side of the light guide type decorative resin molded product 1.

Example 4
As shown in FIG. 5, the light guide type decorative resin molded product 1 includes a light transmissive resin layer 5 formed integrally with a light transmissive resin layer 4 positioned around a light transmissive sheet material 3. A translucent resin member 30 is disposed on the side of the translucent sheet material adjacent to the side surface of the non-translucent sheet material 3. And the 2nd light source 17 is arrange | positioned in the recessed part 31 formed in the back surface of the translucent resin member 30, and the light from the 2nd light source 17 is exposed outside from the translucent resin member 30. FIG.

  The second light source 17 can be set so that light having a wavelength different from that of the light source 9 is emitted, and can function as an accent of the display unit in the operation panel 101. At this time, since the distal end surface 7 of the distal end portion 6 of the sheet material 3 is in the opaque resin layer 5, if the side surface portion 12 of the sheet material 3 is opaque, The light from the light source 9 does not leak toward the light tree member 30, and the light from the second light source 17 from the translucent resin layer 30 can function as a clear accent.

  In addition, the sticker which printed "cooking rice" by the non-transparent character on the translucent raw material can also be attached to the surface of this translucent resin layer 30. In this case, the translucent resin layer 30 can be used not only as an accent but also as a functional component of the operation panel 101 in FIG.

  Alternatively, the entire surface of the translucent resin member 30 may be covered with a light-impermeable film, and a translucent character / pattern may be formed on the light-impermeable film. In this case, the light from the second light source 17 can be transmitted only from the translucent character / pattern, and the character / pattern can be clearly displayed.

  Further, the translucent resin layer 30 is movably disposed adjacent to the side surface side of the sheet material 3, and the translucent resin layer 30 is provided with a switch 34 on the back surface side. For example, the switch 34 is operated by depressing it. In this way, it can be applied not only to electrical appliances but also to switches in the interior of automobiles, for example.

  Hereinafter, the manufacturing method of the light guide type decorative resin molded product 1 of the present invention will be described. 6 to 17 are enlarged views of the main part showing the movement of the mold and the resin, and the entire mold and resin are omitted for easy understanding.

  As shown in FIG. 6, first, as a sheet material arrangement process, an opaque design sheet surface 3 that forms an outer decorative design surface and prevents light leakage from a region other than the region where light leaks, It arrange | positions so that the surface may follow the inner surface of the cavity 55 of the 1st metal mold | die 50. FIG.

  More specifically, the sheet material 3 is arranged in an L shape along the bent portion 52 of the first mold 50 in the first mold 50. At this time, although not shown, a binder layer serving as an adhesive for the molten resin to be injected later is formed on the back side of the sheet material 3. Further, a gap C (clearance) between the back surface of the front end portion 6 of the sheet material 3 and the corner apex portion 53 of the second mold 51 is such that they are not in contact with each other and no burrs are generated. ) Is provided, and the first mold 50 and the second mold 51 are clamped. In other words, the corner crest 53 of the second mold 51 enters with a gap C that does not sandwich the leading end 6 of the sheet material 3, and clamps the first mold 50 and the second mold 51. Thus, the cavity 55 is formed.

  This gap C (clearance) is a gap that stops the outflow of the resin and allows the passage of air. When the resin is injected, excess air in the mold is pushed out, but the resin does not flow out. Air vent. The gap C is formed with a thickness of about 0.02 mm to 0.05 mm. Even if the gap C is in the range of 0.05 mm to 0.8 mm, the same effect can be obtained.

  Next, as shown in FIG. 7, as a primary molding step, the melted primary resin 15 is injected into the cavity 55 formed by clamping and insert molding is performed. Thereby, as shown in FIG. 8, the intermediate molded product 45 in which the sheet material 3 and the plate-like translucent resin layer 4 are integrated is formed. In this primary molding step, as is apparent from FIG. 8, the intermediate molded product 45 is molded in a state where the front end portion 6 of the sheet material 3 protrudes from the lower surface of the translucent resin layer 4.

  As a secondary molding step, as shown in FIGS. 9 to 11, the secondary side resin is injected on the back surface side of the intermediate molded product 45, and the back surface side of the translucent resin layer 4 of the intermediate molded product 45 is injected. The opaque resin layer 5 is integrally formed.

  More specifically, as shown in FIG. 9, the second mold 51 is opened while the intermediate mold 45 is held in the first mold 50, and the third mold 57 is further replaced. The first mold 50 and the third mold 57 are clamped to form a cavity 56 on the back surface side of the intermediate molded product 45. Then, as shown in FIG. 10, the melted secondary resin 16 is injected into the cavity 56 and injection molding (two-color molding) is performed. By such two-color molding, as shown in FIG. 11, the opaque resin layer 5 is integrally molded with respect to the intermediate molded product 45 of FIG.

  By the manufacturing method as described above, the front end portion 6 of the non-translucent sheet material 3 is overlapped with the non-translucent resin layer 5 and the translucent resin layer 4 together with the non-translucent resin layer 5. The sheet material 3, the translucent resin layer 4 and the non-translucent resin layer 5 are integrated with each other. In the light guide type decorative resin molded product 1 obtained in this way, the front end portion 6 of the sheet material 3 on the side surface side enters the opaque resin layer side 5 and the front end surface 7 of the sheet material 3 is exposed to the outside. It is said that it does not. If manufactured in this way, wrinkles (sag) do not occur in the sheet material 3, and the light in the resin can be prevented from being exposed from unintended portions.

  12-17 has shown the other example of said manufacturing method. In addition, about the location already demonstrated above, a common code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 12, as the sheet material arranging step, the opaque sheet material 3 is arranged so that the surface thereof is along the inner surface of the cavity 68 of the first mold 60. Moreover, the 2nd metal mold | die 61 is arrange | positioned through the back surface side and the space | interval of the sheet | seat material 3 by the side of the sheet | seat material 3 of the side surface side.

  More specifically, the second mold 61 is disposed so as to face the back surface of the sheet material 3 from the side surface side to the surface, and the second mold 61 includes the protruding portion 65. The projecting portion 65 includes a curved portion 66 so as to be close to the back surface side near the upper surface portion 10 from the front end portion 6 of the sheet material 3 through the bent portion 11 at the time of mold clamping. It is formed by opening C. The gap C is the same air vent as described above, and is about 0.02 to 0.05 mm. The protrusion 65 includes an inclined portion 67 for forming the inclined surface 22 of the opaque resin layer 5 on the cavity 68 side. The cavity 68 is formed by clamping the first mold 60 and the second mold 61.

  Next, as shown in FIG. 13, as a primary molding step, after the second mold 61 is clamped, the melted primary resin 15 is injected into the cavity 68 and insert molding is performed. Accordingly, as shown in FIG. 14, the translucent resin layer 4 is not disposed on the back surface side of the front end portion 6 or the bent portion 11 of the sheet material 3, but only on the back surface side of the upper surface portion 10 of the sheet material 3. It is possible to obtain an intermediate molded product 46 that is arranged and in which the sheet material 3 and the translucent resin layer 4 are integrated.

  As shown in FIGS. 15 to 17, as the secondary molding step, instead of the second mold 61 in FIG. 12, the back surface of the primary side resin 15 in front of the front end surface 7 of the sheet material 3 on the side surface side. A third mold 62 is disposed across the side and the space, and the secondary resin 16 is injection-molded (two-color molding) between the third mold 62 and the primary resin 15.

  More specifically, as shown in FIG. 15, the second resin mold 61 is opened and replaced with the third mold 62, and the mold is clamped to form a cavity 69 on the back side of the intermediate molded product 46. Form. Then, as shown in FIG. 16, the melted secondary resin 16 is injected into the cavity 69 and injection molding (two-color molding) is performed. By such two-color molding, the opaque resin layer 5 is integrally molded with respect to the intermediate molded product 46 as shown in FIG.

  By the manufacturing method as described above, the front end portion 6 of the non-translucent sheet material 3 is overlapped with the non-translucent resin layer 5 and the translucent resin layer 4 together with the non-translucent resin layer 5. The sheet material 3, the translucent resin layer 4 and the non-translucent resin layer 5 are integrated with each other. In the light guide type decorative resin molded product 1 obtained in this way, the front end portion 6 of the sheet material 3 on the side surface side enters the opaque resin layer side 5 and the front end surface 7 of the sheet material 3 is exposed to the outside. It is said that it does not. Further, in the light guide type decorative resin molded product 1, a translucent resin layer 4 and a translucent resin layer 5 are located on the back side of the sheet material 3, and the translucent resin layer 5 is The sheet material 3 is also arranged on the back surface side of the bent portion 11 and the side surface portion 12 so as to be in contact with the side surface side of the translucent resin layer 4. At this time, the light-impermeable resin layer 5 has an upper surface 21 and an inclined surface 22 that is continuous with the upper surface 21 and is inclined in the direction of the sheet material 3 (upward).

  In addition, the 1st metal mold | die 50,60 demonstrated above and the 2nd metal mold | die 51,61 are not restricted to one each, and may be divided into two or more according to a product shape.

  In the secondary molding process described above, the intermediate moldings 45 and 46 after the primary molding process are arranged as inserts in a mold for secondary molding, and the intermediate molding is performed by clamping the mold. Cavities 56 and 69 corresponding to the light-impermeable resin layer 5 as the secondary resin 16 are formed on the back surfaces of the products 45 and 46, and the secondary resin 16 is injected into the cavities 56 and 69, It is also possible to integrally mold the opaque resin layer 5 on the back side of the molded products 45 and 46 by insert molding.

  Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these embodiments, and the knowledge of those skilled in the art can be used without departing from the spirit of the claims. Various modifications based on this are possible.

DESCRIPTION OF SYMBOLS 1 Light guide type decorative resin molding 2 Light transmission part 3 Sheet material 4 Translucent resin layer 5 Non-translucent resin layer 6 Tip part 7 Tip surface 8 Cavity part 9 Light source 15 Primary side resin 16 Secondary side resin 17 Second light source 30 Translucent resin layer 31 Recess 34 Switch 45, 46 Intermediate molded product 50, 60 First mold 51, 61 Second mold 57, 62 Third mold 55, 56, 68, 69 Cavity C Clearance

Claims (12)

Light-guided decoration that has a decorative design surface, guides light emitted from an internal light source through the resin to a predetermined region of the decorative design surface, and leaks light in that region to provide a design effect A resin molded product,
A translucent resin layer formed in a plate shape having translucency as the primary side resin layer;
A non-translucent light-transmitting material that is integrally formed on the back surface side of the translucent resin layer as a secondary resin layer and prevents the light from leaking to the back surface side of the translucent resin layer. A conductive resin layer;
The outer surface of the translucent resin layer is formed so as to cover the area except for the area where light is leaked to form the decorative design surface, and leakage of light from areas other than the area where light is leaked is prevented. A translucent sheet material that is translucent and that is positioned so that the tip portion wraps around the translucent resin layer,
The translucent sheet material surrounds the translucent resin layer from the outside together with the translucent resin layer in a form in which the front end portion overlaps the translucent resin layer. A light guide type decorative resin molded product.   2. The structure according to claim 1, wherein a front end portion of the light-impermeable sheet material enters the light-impermeable resin layer and the front surface of the sheet material is not exposed to the outside. Light guiding decorative resin molded product. The non-translucent resin layer is formed integrally with a part of the back side and the side of the translucent resin layer,
3. The light guide type according to claim 1, wherein the translucent resin layer and the translucent resin layer are located on a back side of the decorative design surface constituted by the translucent sheet material. Decorative resin molded product.   A cavity that reaches the translucent resin layer is formed in the translucent resin layer, the light source is arranged in the cavity, and the light of the decorative design surface is disposed on the translucent sheet material. 4. The light guide type decorative resin molded product according to claim 1, further comprising: a light transmitting portion that forms the region for leaking light, wherein light from the light source leaks to the outside from the light transmitting portion. .   The translucent sheet material has a translucent printing surface on the front surface or the back surface of the translucent material sheet, the light transmitting portion is formed by a non-printing portion of the printing surface, and the light of the light source is The light guide type decorative resin molded product according to claim 4, which permeates the permeable material sheet and leaks to the outside.   The side surface of the translucent sheet material formed integrally with the translucent resin layer located around the translucent sheet material is a side surface of the translucent sheet material. A translucent resin member is disposed adjacent to the second translucent resin member, a second light source is disposed in a recess formed on the back surface of the translucent resin member, and light from the second light source is transmitted to the outside from the translucent resin member. The light guide type decorative resin molded product according to any one of claims 1 to 5, which is leaked.   The translucent resin member is movably disposed adjacent to the side surface of the sheet material, the translucent resin member is provided with a switch on the back side, and the switch is operated by the translucent resin member. The light guide type decorative resin molded product according to claim 6. Light-guided decoration that has a decorative design surface, guides light emitted from an internal light source through the resin to a predetermined region of the decorative design surface, and leaks light in that region to provide a design effect A method of manufacturing a resin molded product,
An opaque sheet material that forms a decorative design surface on the outer surface and prevents light leakage from a region other than the light leakage region is disposed so that the surface thereof is along the inner surface of the cavity of the mold. Sheet material placement process;
A primary molding step of injecting a primary side resin into the cavity and integrally molding a plate-like translucent resin layer having translucency on the back surface of the sheet material;
A secondary side resin is injected further into the back side of the intermediate molded product in which the translucent resin layer is integrally formed on the back side of the sheet material, and is not applied to the back side of the translucent resin layer in the intermediate molded product. A secondary molding step of integrally molding the translucent resin layer,
The sheet is formed so that a front end portion of the light-transmitting sheet material overlaps the light-transmitting resin layer and surrounds the light-transmitting resin layer together with the light-transmitting resin layer. A method for producing a light guide type decorative resin molded article, wherein at least one of a material arranging step and the primary molding step is performed. The molds clamped to mold the intermediate molded product in the primary molding step are the first mold and the second mold, and the sheet material is disposed along the cavity inner surface of the first mold, The primary molding step is performed by the first and second molds as insert molding of the sheet material,
In the secondary molding step, the first and second molds are opened while the intermediate molded product after the primary molding step is held in the first mold, and further replaced with the second mold. The third mold and the first mold are clamped to form a cavity portion corresponding to the light-impermeable resin layer as the secondary resin on the back side of the intermediate molded product. The method for producing a light guide type decorative resin molded product according to claim 8, wherein a secondary side resin is injected into a portion and the opaque resin layer is integrally formed with the intermediate molded product by two-color molding.   The second mold is disposed opposite to the back surface of the sheet material from the front surface to the side surface side, and the primary molding step is performed on the first resin on the back surface of a part of the sheet material. The method for producing a light-guided decorative resin molded product according to claim 9, wherein:   The light guide according to claim 9 or 10, wherein a gap is formed between the back surface of the sheet material and the second mold facing the back surface so as to stop outflow of resin and allow air to pass therethrough. Manufacturing method of mold decorative resin molded product.   In the secondary molding step, the intermediate molded product after the primary molding step is disposed as an insert material in a mold for secondary molding, and the mold is clamped on the back side of the intermediate molded product. A cavity portion corresponding to the opaque resin layer as the secondary resin is formed, the secondary resin is injected into the cavity portion, and the opaque resin layer is disposed on the back surface side of the intermediate molded product. The method for producing a light guide type decorative resin molded product according to claim 8, wherein the molded product is integrally molded by insert molding.

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