JP4274511B2 - Molded product - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold molded product in which a foil is transferred during molding using a film for foil transfer.
[0002]
[Prior art]
Plastic parts are excellent in moldability as compared with metal, and are light and low in cost. Therefore, plastic parts are often used in various products. For example, cameras are becoming smaller, lighter, and less expensive, and plastic parts are used not only for the components inside the camera body, but also for the front and rear covers that make up the body and the lens barrier that is attached to the front of the front cover. Has been. In order to enhance the decorativeness of the appearance, various decorations are applied to the front and rear covers and the lens cover such that a color material is applied and characters and marks are printed.
[0003]
As one of the decorations, a metal foil is attached to the lens cover. Since the metal foil is glossy, affixing it to the lens cover has an effect of increasing the sense of quality and enhancing the appearance decoration.
[0004]
A plastic part is generally molded by an injection molding method or the like. As a method of attaching a metal foil to this molded plastic part (molded product), for example, Japanese Patent Laid-Open No. 7-239402. There is a foil transfer method described in the publication. In this method, as shown in FIG. 8, a foil transfer film 38 having foil pieces 26 and 27 provided on a support is inserted into a mold, and a mold molded product, for example, a lens barrier 12 is molded. In this method, the foil pieces 26 and 27 are transferred to the sheet.
[0005]
The lens barrier 12 is formed with a finger hanging recess 21 a in the center of the surface 21. The foil piece 26 is transferred to the recess, while the foil piece 27 is transferred from the end of the surface 12 of the lens barrier 12 to the peripheral portion 22. When the lens barrier 12 is attached to the front cover, the back surface 23 faces the front cover. Moreover, since these gaps are very narrow, the back surface 23 cannot be seen from the outside. For this reason, the foil piece is not transferred to the back surface 23.
[0006]
[Problems to be solved by the invention]
However, as shown in FIG. 9, when the transfer position of the foil piece 27 is shifted, the end portion 27 a of the foil piece 27 protrudes from the peripheral edge portion 22, and so-called burrs are generated. Since the lens barrier 12 is slidably provided on the front cover, if a burr occurs, the camera body may be scratched and the appearance may be significantly impaired. Further, while the lens barrier 12 is being slid, as shown by a two-dot chain line in the drawing, the burrs may wrap around the back surface 23 and cause malfunction.
[0007]
Of course, in consideration of the maximum error in the transfer position, the foil piece 27 can be formed in advance in advance so that no burrs are generated even when a positional deviation occurs. However, when this is done, a defective portion of the foil piece 27 is generated at the peripheral edge portion 22. Since the peripheral portion 22 is exposed to the outside, if a defective portion is generated in a part of the peripheral portion 22, the degree of decoration of the appearance is lowered, and the purpose of providing the foil piece 27 is impaired.
[0008]
In order to solve the above-described problems, an object of the present invention is to provide a mold product capable of stable operation.
[0009]
Another object is to provide a mold product that does not reduce the degree of decoration of the appearance even when it is used as a component constituting the appearance.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the mold product of the present invention is a mold product in which foil is transferred to a peripheral part during molding using a film for foil transfer. As shown, a slope that is inclined toward the surface side is provided between the peripheral edge portion and the back surface. The mold product is preferably used as a part constituting the appearance of various products such as a lens barrier of a camera.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The camera 10 shown in FIGS. 1 and 2 is provided with a lens barrier 12 on the front surface of a main body 11. The front and rear covers 11a and 11b and the lens barrier 12 constituting the main body 11 are molded products. As a result, the cost and weight of the camera 10 are reduced.
[0012]
The lens barrier 12 is for protecting the photographing lens 13, and is between an open position (FIG. 1) that exposes the photographing lens 13 when used and a closed position (FIG. 2) that covers the photographing lens 13 when not used. It is slidably provided. The lens barrier 12 and the lens barrel 14 are interlocked. When the lens barrier 12 is moved to the open position, the lens barrel 14 incorporating the photographing lens 13 is extended from the main body 11 and the lens barrier 12 is closed. The lens barrel 14 is retracted into the main body 11.
[0013]
As shown in FIG. 2, metal foil pieces 26 and 27 are transferred to the lens barrier 12 by a transfer method described later. The lens barrier 12 has an elliptical shape, and the surface 21 is a gently curved surface. A recess 21a for a finger is formed at the center of the surface. The user slides the lens barrier 12 by placing a finger on the recess 21a. The foil piece 26 is transferred to the depression 21a.
[0014]
A foil piece 27 is transferred around the lens barrier 12. The foil piece 27 has a shape corresponding to the outer shape of the lens barrier 12, and the center thereof is an opening that exposes the central portion of the lens barrier 12. The foil piece 27 is transferred from the end of the surface 21 to the peripheral edge 22. By providing the foil pieces 26 and 27, the sense of quality is increased and the degree of decoration of the appearance of the camera 10 is enhanced.
[0015]
As shown in FIG. 3, an inclined surface 24 inclined toward the front surface 21 side is provided between the peripheral edge portion 22 and the back surface 23 so that the peripheral edge portion 22 projects outward from the back surface 23.
[0016]
The height h from the back surface 23 to the lower end of the peripheral edge portion 22 is determined in consideration of the maximum error in the displacement of the transfer position of the foil piece 27. That is, when the transfer position of the foil piece 27 is shifted, the end portion 27a of the foil piece 27 protrudes from the lower end of the peripheral edge portion 22 and a so-called burr is generated. The height h is determined so as to be larger than the protrusion amount of the burr when the positional deviation occurs within the range of the maximum error. The inclination of the slope 24 is determined according to the height h.
[0017]
By doing so, even if burrs are generated due to the shift of the transfer position of the foil piece 27, the burrs do not protrude beyond the back surface 23, so that the front cover 11a is not damaged by the burrs.
[0018]
In addition, since the slope 24 is provided between the peripheral edge portion 22 and the back surface 23, even when the burr is bent inward, the back surface 23 does not wrap around. Accordingly, the burr does not enter the gap between the back surface 23 and the front cover 11a, and the lens barrier 12 does not malfunction.
[0019]
Further, since the slope 24 is difficult to see from the surface 21 side, the provision of the slope 24 does not impair the appearance decoration. The peripheral portion 22 in this example is synonymous with the side surface of the lens barrier, but when the surface and the side surface are the same surface, the peripheral portion indicates the periphery of the surface.
[0020]
The lens barrier 12 is a mold product manufactured by injection molding of a resin material. FIG. 5 is an explanatory view showing a manufacturing procedure. The injection mold 31 includes a movable mold 32 and a fixed mold 33. The movable mold 32 is lowered in the direction of the fixed mold 33 at the time of molding by a jack-up mechanism (not shown), and the end portions 32 a and 32 b are pressure-bonded to the fixed mold 33.
[0021]
The stationary mold 33 is provided with a gate 33a into which a resin 36 obtained by thermally melting a transparent resin, which is a material for forming the lens barrier 12, is injected at the center. The gate 33a is connected to a supply mechanism (not shown) of the resin 36, and the hot melted resin 36 is intermittently supplied. Further, a groove 33 b for forming the inclined surface 24 is provided on the inner surface of the fixed mold 33.
[0022]
A foil transfer film 38 drawn from the donor roll 37 is continuously supplied and set between the movable mold 32 and the fixed mold 33. As shown in FIG. 5C, after the foil pieces 26 and 27 are transferred to the surface 21 and the peripheral portion 22 of the lens barrier 12, the foil transfer film 38 is wound up on the donor roll 47.
[0023]
As shown in FIG. 6, the foil transfer film 38 is provided with the foil pieces 26 and 27 on the support 41 so as to be peelable. Each foil piece 26, 27 is provided with an adhesive layer 42 for adhering to the lens barrier 12. The adhesive layer 42 is thermally melted, and the foil pieces 26 and 27 are transferred to the lens barrier 12.
[0024]
As shown in FIG. 7, a long foil transfer film 38 is divided into a plurality of areas 39, and in each area 39, the foil pieces 26 and 27 correspond to the transfer positions of the lens barrier 12. It is arranged at the position to do. The donor roll 37 is obtained by winding this long foil transfer film 38 in a roll shape.
[0025]
In addition, a mark 40 is provided beside each area 39. This mark 40 is for controlling the feed amount of the foil transfer film 38, and for example, an optically readable optical mark is used. The supply amount is controlled by reading the mark 40 with a photo sensor or the like. As the mark 40, a magnetic mark may be used in addition to the optical mark. In this case, a magnetic layer is required for the foil transfer film 38.
[0026]
Of course, the feed amount of the foil transfer film 38 may be controlled by controlling the rotation amount of the drive motor that drives the donor roll 37. However, by using the mark 40, it is possible to control the feed amount with higher accuracy than the control by the drive motor.
[0027]
Next, the operation of the above configuration will be described. When the lens barrier 12 is manufactured, a foil transfer film 38 is set between the movable mold 32 and the fixed mold 33 as shown in FIG. At this time, the foil transfer film 28 is held at positions corresponding to the foil piece 26 in the recess 21 of the lens barrier 12 and the foil piece 27 in the surface 21 and the peripheral portion 22 of the lens barrier 12, respectively.
[0028]
Next, as shown in FIG. 5B, the movable mold 32 is lowered, the end portions 32 a and 32 b are pressed against the fixed mold 33, and the foil transfer film 38 is moved between the movable mold 32 and the fixed mold 33. Sandwiched between. Then, the molten resin 36 is injected from the gate 33a. Then, the resin 36 is filled in the entire molding space formed by the movable mold 32 and the fixed mold 33. At the same time, the foil transfer film 38 held between the movable mold 32 and the fixed mold 33 is pressed against the movable mold 32 together with the resin 36 by the injection pressure of the resin 36.
[0029]
At this time, the adhesive layer 42 is thermally melted by the heat of the molten resin 36, and the foil pieces 26 and 27 of the foil transfer film 38 are thermally transferred to the molded lens barrier 12. Then, when the molten resin 36 is solidified after a certain period of time, the movable mold 32 is raised as shown in FIG. 5C, and at the same time, the transferred foils 26 and 27 are left on the lens barrier 12, The foil transfer film 38 is peeled off from the lens barrier 12. Thereafter, the lens barrier 12 is removed from the fixed mold 33.
[0030]
Thereafter, the donor roll 37 is wound up, a new foil transfer film 38 is set at a predetermined position, and the lens barrier 12 is continuously manufactured again by the process described above.
[0031]
The manufactured lens barrier 12 is sent to the assembly process of the camera 10. The lens barrier 12 is provided with an inclined surface 24 between the peripheral edge portion 22 and the back surface 23. Therefore, even if the transfer position of the foil piece 27 is shifted and burrs are generated at the time of injection molding, the front cover 11a is not damaged. Further, the lens barrier 12 can operate stably because it does not enter the gap between the front cover 11a and the back surface 24.
[0032]
In addition, although the example of the process of manufacturing a lens barrier was shown in the example mentioned above, the metal mold product of this invention can be used for various plastic parts. In addition to the injection molding, die molding can be similarly performed by pressure molding, compression molding, or the like.
[0033]
【The invention's effect】
As described above in detail, the mold product of the present invention has a surface between the peripheral part and the back surface so that the peripheral part projects outward in the mold product in which the foil is transferred to the peripheral part. Since the slope inclined toward the surface is provided, even when this mold-molded product is used as a component constituting the appearance of the product, the degree of decoration of the appearance is not reduced. In addition, by providing a slope, even if the burr is bent, it will not wrap around to the back of the molded product, so even if it is provided with the back facing other parts, it is stable. Can be operated.
[Brief description of the drawings]
FIG. 1 is an external perspective view showing a use state of a camera with a lens barrier.
FIG. 2 is an external perspective view showing a non-use state of a camera with a lens barrier.
FIG. 3 is an explanatory diagram of a foil piece attached to a lens barrier.
FIG. 4 is a cross-sectional view of a lens barrier.
FIG. 5 is an explanatory diagram showing a procedure for manufacturing a lens barrier.
FIG. 6 is a cross-sectional view of a foil transfer film.
FIG. 7 is an explanatory diagram of a foil transfer film.
FIG. 8 is an explanatory view showing a foil transfer method.
FIG. 9 is a cross-sectional view of a conventional lens barrier.
[Explanation of symbols]
12 Lens barrier 21 Front surface 22 Peripheral portion 23 Back surface 26, 27 Foil piece 38 Foil transfer film

Claims (6)

In the mold molded product in which the foil is transferred to the peripheral part at the time of molding using the film for foil transfer provided in a peelable manner on the support for the transfer foil ,
It is a slope that slopes toward the front surface between the periphery and the back so that the periphery protrudes outward from the back, and has a slope that prevents burrs generated on the transferred foil from going around the back Mold product characterized by that. The height from the back surface to the lower end of the peripheral edge, which defines the inclination of the slope, is determined to be larger than the amount of burr protruding due to the displacement of the transfer position of the foil. Molded product. 3. The molded article according to claim 1, wherein the molded foil is removed from the mold without being subjected to a cutting process for the burrs of the transferred foil. The die-molded product according to any one of claims 1 to 3, wherein the molded product is used as a component constituting an appearance of a camera. A foil transfer method for a mold molded product in which a foil is transferred to the surface of a mold molded product molded by a mold using a foil transfer film in which a transfer foil is detachably provided on a support. In
It is a slope formed at the periphery of the mold product, and a shape capable of forming a slope inclined toward the surface side between the periphery and the back so that the periphery protrudes outward from the back. A foil transfer film supply step for supplying the foil transfer film into the mold having
In the mold supplied with the foil transfer film, the mold transfer product having the slope and the foil transfer step of transferring the foil to the surface including the peripheral edge,
A foil transfer method for a molded product, comprising: a step of taking out the molded product from the mold without cutting the burr of the transferred foil after the foil transfer step. 6. The method for transferring a foil of a molded product according to claim 5, wherein the molded product is a part constituting an appearance of a camera.

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