1. Field
The present invention relates generally to the manufacture of molded plastic articles, and more particularly to a laminate comprising one or more films and electronic components such as an antenna or printed circuit, which is insert molded into a plastic article, and methods for producing such laminates and insert molded articles.
2. Description of Related Art
Numerous electronic devices such as cellular phones, MP3 players, radio receivers, radio transmitters, personal digital assistants (PDAs), integrated combinations of the foregoing and similar devices, comprise electronic components disposed on a chassis and contained in a housing or enclosure. The housing or enclosure typically includes multiple parts, including a top and bottom cover. Electronics components may also be mounted to the housing parts. The electronic components may include, for example, circuitry, microprocessor(s), memory, hard drive(s), antenna(s), switches and similar electronic devices. The chassis and housing are commonly formed of injection molded plastic parts.
It is known that components may be integrally formed with injection molded chassis and housing parts by a process known as insert molding. The insert molding process comprises a method of producing an article by placing one or more components of the article into a mold. The component(s) may be clamped or otherwise held in place (such as, for example, by suction) in the mold. Molten plastic resin may then be injected into the mold over the component(s). The result is a one-piece, permanently bonded article having the component(s) molded into the article. The technique of insert molding of electronic components into part of a housing is generally described in U.S. Patent Publication No. U.S. 2005/0001767 A1, the contents of which is incorporated herein by reference in its entirety.
Previously known insert molding processes have several shortcomings. For one, certain components may be damaged during the insert molding process due to contact with the molten resin. In addition, there is no means provided for forming the components to conform to the size and shape of the molded article. It may also be desirable to decorate the molded article with graphics and/or color.
Accordingly, there is a need for insert molded articles and a method for making them which overcomes the above-described deficiencies.
The present method and apparatus is directed to an insert molded article and method of producing such insert molded article. In one embodiment, the insert molded article comprises a laminated appliqué comprising a first substrate, which may be in the form of a thin film, and an electronic component laminated to the film. The electronic component may be simply bonded to the first substrate using an adhesive or it may be formed on the substrate such as by printing conductive ink onto the substrate. A second substrate may then be applied over the electronic component. The second substrate may be bonded over the electronic component using adhesive, a layer of curable ink applied between the substrates, catalyzing a bonding mechanism between the first and second substrates (such as heat, chemical process, ultra-sonic welding, etc.), or using some other suitable method. In some embodiments, additional substrate layers may be laminated onto the appliqué. For example, substrate layers, such as graphic layers and protective layers, may be laminated onto the appliqué by similar bonding processes or via a printed film.
The laminated appliqué may then be trimmed and formed to the desired shape and size, such as to conform to the size and shape of the molded article. The laminated appliqué may be trimmed using any suitable cutting process. The trimming can be performed to not only properly size the appliqué, but also to tune or adjust the electronic component such as, for example, an antenna. The appliqué may also be formed into a three-dimensional shape by thermal forming, vacuum forming, pressure forming, blow molding, or some other suitable process.
The appliqué is then placed into a mold and molten resin is injected into the mold over the appliqué. The part is removed from the mold resulting in a one-piece, permanently bonded article having the appliqué carrying the electronic component(s) molded into the part.
Referring now to the figures, the insert molded article and method for producing same according to the present teachings are described in detail. Throughout the figures, like reference numerals refer to like elements, and the description for like elements are applicable for all described embodiments wherever relevant.
Turning first to
In the embodiment shown in
In the embodiment shown in
In some embodiments, the electronic component 18 may be bonded to the bottom surface 16 by any suitable method, including without limitation, using an adhesive, a thermally activated adhesive layer, a radiation curable adhesive, a radiation curable ink, or a lamination adhesive.
In some embodiments, an adhesion promotion layer 20 may be disposed onto the bottom surface of the electronic component 18 (and also to the areas of the base substrate 12 not covered by the electronic component 18) which promotes adhesion of the molding resin 22 to the appliqué 11 during the molding process described below. In some embodiments, the adhesion promotion layer 20 may comprise a thermally activated adhesive layer or other suitable adhesion layer.
If any curable inks, adhesives or layers are utilized in forming the appliqué 11, a curing step may be performed at an appropriate time. For example, the curing step may be performed immediately after applying the curable material and any substrate to which it is intended to bond, or after other layers of the appliqué 11 have been applied.
In some embodiments, once the layers of the appliqué 11 have been applied, the appliqué 11 will, in some embodiments, comprise a flat sheet. At this point, the appliqué 11 may be trimmed to a desired shape and size for the insert molded article 10. In some embodiments, a die may be used to trim the appliqué 11.
In some embodiments, at this point in the fabrication process, the insert molded article 10 may not have a flat shape similar to the appliqué 11. Instead, the insert molded article 10 may have a three-dimensional shape. Accordingly, the appliqué 11 may be formed into a desired three-dimensional shape, such as a shape that conforms to the shape of the molded article 10, or a surface or portion of the molded article 10. For example, as shown in the figures, the appliqué 11 may be formed to have a curved or wavy shape. The appliqué 11 may be formed in the three-dimensional shape by thermal forming, vacuum forming, pressure forming, and blow molding, or using some other suitable process.
At any stage of the appliqué 11 forming process, the electronic component 18 may be electrically trimmed, tuned or modified for optimal performance characteristics as required for a given application. For example, if the electronic component 18 comprises an antenna for a cell phone, the antenna length may be adjusted by trimming the antenna to tune it for a given cell phone.
Once the appliqué 11 is complete, it may be placed into an injection molding mold. The appliqué 11 may simply sit in the mold, or it may be held in place in the mold by clamps, clips, suction or other suitable means. Also, the appliqué 11 may not bear against a wall of the mold, but may be spaced apart from the wall of the mold, such as by using spacers. In this way, molten resin injected into the mold over the appliqué 11 can be placed around any part of the appliqué 11. Alternatively, a surface of the appliqué 11 can be placed directly against a wall of the mold so that the surface of the appliqué 11 that is placed against the wall will be on the outside surface of the finished article 10. Molten resin may then be injected into the mold over the appliqué 11. In one embodiment, the heat from the molten resin activates the adhesion promotion layer 20 such that when the molten resin cools to form the molding resin 22, there is good adhesion between the appliqué 11 and the molding resin 22. Once the molding resin cools sufficiently to set the molding resin 22, the finished article 10 may be removed from the mold. The result is a one-piece, permanently bonded insert molded article 10 having an appliqué 11 with an electronic component 18 molded into the article 10.
In order to provide access to the electronic component 18, such as for electrical connections, access apertures 24 may be included. The electrical connection may comprise pins, wires, via, or built-in flex connectors, attached by conventional methods. The access apertures 24 may extend through any one or more of the layers of the appliqué 11, such as through the molding resin 22 and through the adhesion promotion layer 20, as shown in the embodiment of
Turning now to
The graphic layer(s) 32 may be applied to the bottom surface 35 of the graphic film substrate 34. The graphic layer(s) may include any graphic design, including without limitation, ornamental, informational, labeling, coloring or other graphics. The graphic layer(s) may be applied by any suitable method, for example by screen printing, lithography, gravure, offset, reprography, ink jet, laser, flexography, or electronic means. Methods of providing graphics for an in-mold label are described in detail in U.S. patent application Ser. No. 10/914,812, filed Aug. 9, 2004, now abandoned, the contents of which is hereby incorporated herein by reference in its entirety. The graphic layer(s) 32 may be applied all at once, or in a series of printing steps. In accordance with one method, after the graphic layer(s) 32 are applied to the graphic film substrate 34, the lamination adhesive 36 is applied over the entire bottom surface 35 of the graphic film substrate 34, including over the graphic layer(s) 32. The electronic component 18 and base substrate 12 may then be applied to these layers. When the lamination adhesive 36 comprises a curable adhesive, such as radiation curable ink, the adhesive 36 is cured thereby bonding the graphic film substrate 34 to the electronic component 18 and the base substrate 12. Alternative to using graphic layer(s) 32, or in addition to the graphic layer(s) 32, the graphic film substrate 34 may also include a graphic design pre-printed onto the substrate 34.
Another insert molded article 40 according to the present disclosed method and apparatus is shown in
Similar to the insert molded article 40 described above, an insert molded article 50 of
The insert molded article 60 of
Referring now to
The insert molded article 80, shown in
Turning to
An insert molded article 110 of
Referring to
Another exemplary insert molded article 130 is shown in
Turning now to
Another embodiment of an insert molded article 150, illustrated in
In
While each of the above embodiments of the present insert molded articles includes various layers that can be combined to form an appliqué according to the present disclosure,
According to the chart of
As is known, there are benefits to being able to place an antenna as far away as possible from a circuit board, processor, etc., within a hand-held electronic device. For example, some antennas do not function well when positioned 4 mm, but function well when positioned at 5 mm from a circuit board. In some applications, it has become a functional requirement to locate the component in the outer skin of the housing. Very specific placement and positioning of antenna components, for example, is critical for providing imposed functionality. The method of manufacturing according to the present disclosure solves the problems of location, position and placement of electronic components. In-mold labeling with robotic loading can provide very accurate and repeatable results.
The insert molded articles described above can be used in many applications, including, for example, as chassis parts, housings, covers or other components of various electronic devices such as cellular phones, MP3 players, radio receivers, radio transmitters, personal digital assistants (PDAs), and integrated combinations of the foregoing and similar devices. For example, for a cell phone cover, the electronic component 18 may comprise an antenna which is applied into an appliqué 11 as described and then insert molded into the cover piece of the cell phone.
While the present method and apparatus have been fully described above with particularity and detail, it will be apparent to those of ordinary skill in the art that many modifications thereof may be made without departing from the principles and concepts set forth herein. Hence, the proper scope of the present method and apparatus should be determined only by the broadest interpretation of the appended claims so as to encompass all such modifications and equivalents.
In addition, although particular features of the disclosed method and apparatus may have been disclosed with respect to only certain of the multiple embodiments, such features may be combined with one or more other features of the other embodiments as may be desired for any particular application.