Abstract:
A wallet card, such as a financial transaction card, has a substantially non-foldable semi-rigid base. Optionally, the semi-rigid base may include a magnifying lens. One or more lights are disposed in the card base to provide illumination.

Description:
RELATED APPLICATIONS 
     This is a continuation-in-part of U.S. patent application Ser. No. 09/767,317 filed Jan. 22, 2001, which is a continuation-in-part of U.S. patent application Ser. No. 09/066,799 filed Apr. 24, 1998, now U.S. Pat. No. 6,176,430, which is a continuation-in-part of U.S. patent application Ser. No. 08/758,640 filed Nov. 27, 1996, now U.S. Pat. No. 5,856,661, which is a continuation-in-part of U.S. patent application Ser. No. 08/582,601 filed Jan. 3, 1996, now U.S. Pat. No. 5,608,203, which is a continuation of U.S. patent application Ser. No. 08/250,801 filed May 27, 1994, abandoned, which is a continuation-in-part of U.S. patent application Ser. No. 08/197,218, filed Feb. 16, 1994, now U.S. Pat. No. 5,434,405 which is a continuation-in-part of U.S. patent application Ser. No. 07/834,490, filed Feb. 12, 1992, now U.S. Pat. No. 5,412,199. 
    
    
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to wallet cards and is specifically directed to a wallet card, such as a credit card, having a built-in light. 
     2. Background 
     The previously issued co-owned patents, namely, U.S. Pat. Nos. 5,412,199; 5,434,405; 5,608,203; 5,856,661; and 6,176,430 disclose wallet cards with integral magnifying lenses and methods for making such cards. The disclosures of these patents are incorporated herein by reference. Such wallet cards are convenient for magnifying and reading printed information, such as sales receipts and the like. Frequently, the user of such a card will desire to read information in a low light situation. To facilitate this, it is desirable to have a source of illumination in proximity to the magnifying lens. Even without a magnifying lens, there are many situations in which it would be desirable to have a wallet card that incorporates a source of illumination. 
     Heretofore, sources of illumination, e.g. flashlights, have been proposed with the same general shape as a credit card or a similar wallet card. Such a light is shown, for example, in U.S. Pat. No. 5,927,846. However, these prior art lights are significantly thicker than an ordinary credit card and, therefore, do not meet ISO standards for such cards. Accordingly, prior art card shaped lights are incapable of functioning as financial transaction cards. 
     SUMMARY OF THE INVENTION 
     The present invention provides a financial transaction card that has a thin, flat, substantially rigid substrate and a source of illumination disposed within the substrate. A source of electrical current is coupled to the source of illumination and a switch is provided to selectively close an electrical circuit between the source of electrical current and the source of illumination. As is customary for financial transaction cards, embossed alphanumeric indicia are included on the substrate. 
     Such a card may be made by printing first transaction card graphics on a first surface of a first core member and laminating a first overlay to the first surface of the first core member. A cavity is routed in a second surface of the first core member and a light is installed in the cavity. The cavity is then filled. Second transaction card graphics are printed on a first surface of a second core member and a second overlay is laminated thereto. The two core members are then joined by securing the second surface of the first core member to a second surface of the second core member. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The invention may be more readily understood by referring to the accompanying drawings in which 
     FIG. 1 shows the top side of a wallet card incorporating a magnifying lens; 
     FIG. 2 shows the bottom side of the wallet card of FIG. 1; 
     FIG. 3 is a plan view of a wallet card incorporating a light in accordance with the subject invention. 
     FIGS. 4A-4E illustrate a method of constructing a wallet card incorporating a light. 
     Like elements are numbered alike throughout the drawings. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     In the following description, for purposes of explanation and not limitation, specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known methods and devices are omitted so as to not obscure the description of the present invention with unnecessary detail. 
     A typical credit card  10  is shown in FIG.  1 . The size and general layout of card  10  have become standardized and similar cards are widely used for a variety of transactions and other purposes. Apart from credit cards, similar cards are used as debit cards, ATM access cards, gift cards, driver&#39;s licenses, identification cards, library cards, etc. Such cards are typically carried in a wallet and are generally referred to herein as “wallet cards”. 
     Card  10  includes, as is common, embossed lettering at  12 , which is machine readable for permitting the credit card to be imprinted at a point-of-sale transaction. As is shown in FIG. 2, most credit cards now contain a strip  14  for carrying machine readable information, for example a magnetic strip material which includes magnetically encoded information readable by computer terminals utilized in many point-of-sale terminals. Also included is a signature strip  16  which is on the back of the card and which typically is adapted for receiving a signature to be manually applied by the user of the card. The card may further include one- or multi-dimensional bar codes as well as smart card contact, contactless or combi-card electronic information storage. 
     The magnetic strip  14  and embossed lettering  12 , along with the signature strip  16 , identify a data zone on the card. For financial transaction cards, this data zone is generally controlled by ISO standards in an effort to standardize the cards so that various cards issued by a multiplicity of institutions may be used on standardized terminals the point-of-sale. For example, the placement of the magnetic strip  14  relative to the top edge  18  of the card is standardized, as is the width of the strip  14  in order to permit ready readability of the magnetically coded information by any typical point-of-sale magnetic reader. Likewise, the font, size and position of the embossed lettering  12  is controlled to assure machine readability of the information imprinted from the card when a point-of-sale transaction is made on a typical credit card imprinter. Only the position of the signature strip  16  can be altered without interfering with the machine readability of the card. 
     Today, many cards also include identifying indicia such as logotypes and the like as indicated at  20  for identifying the issuing institution. An increasing number of cards also include a hologram panel  22  which includes issuing institution indicia. The hologram panel  22  is generally located in or near the portion of the data zone including the embossed lettering  12 . In the card shown in FIGS. 1 and 2, a magnifying lens  24  is positioned such that it is in non-interfering relationship with the magnetic strip  14  and the embossed lettering  12 . The magnifying lens  24  is rectangular and is mounted parallel to the magnetic strip  14  in the space between the magnetic strip and the embossed lettering. This space is generally sufficient in size to accommodate the lens  24  since it is required that the embossed lettering  12  be spaced sufficiently from the magnetic strip  14  to assure that the embossing of the card does not in any way alter the functionality of the magnetic strip. A fresnel-type contour lens has been found to be particularly useful for this type of application. Such a lens is formed with concentric fresnel contour lines  36 . 
     FIG. 3 illustrates a wallet card  400  having a light  410  disposed on the bottom or reverse side  402  of a wallet card. This is particularly useful for assisting the user in examining magnified objects in a darkened environment. Optionally, card  400  may incorporate a lens  404  formed by the methods described in the referenced patents. A magnetic stripe  406  and a signature panel  408  are provided as is customary. Light  410  is preferably a light-emitting diode (LED), although any other suitable source of illumination may be utilized, such as a conventional incandescent bulb, electroluminescent panel or the like. Although only a single light  410  is illustrated, a plurality of lights may be installed, if desired. 
     Light  410  is powered by one or more batteries  414  disposed within card  400 . Conventional wafer cell batteries may be used or a flat laminated battery may be constructed integrally with the wallet card. Ultra-thin battery construction is described, for example, in U.S. Pat. Nos. 5,888,672 and 6,045,942. 
     To control operation of light  410 , a switch, such as switch  412 , is placed at a convenient location on card  400 . Switch  412  is preferably a pressure sensitive switch that may be activated by finger pressure when card  400  is held between the thumb and index finger. 
     A method of manufacturing card  400  is illustrated in FIGS. 4A-4E. This method utilizes a split core construction to which front and rear overlays are laminated. A first core member  420  has a thickness of approximately 24.4 mils. The surface of core member  420  is printed with graphics appropriate for the particular card application. The printed surface of core member  420  is then laminated with overlay  422 , which has a thickness of approximately 1.6 mils. The lamination process employs a pressure of about 400 psi and a temperature of about 100° C. 
     Referring next to FIG. 4B, a cavity  424  is milled or routed into core member  420  to accept the electronic components denoted generally by reference numeral  430 . These components include battery  414 , at least one light-emitting diode (LED)  410 , switch  412  and interconnection circuitry  429 . The interconnection circuitry may be formed within cavity  424  by a printing process with conductive ink or by deposition of metallic circuit traces. Alternatively, the entire floor of cavity  424  may be metallized and circuit traces nay then be formed using a conventional photoetching process. Once the interconnection circuitry has been formed, the battery  414 , LED  410  and switch  412  are inserted in respective areas of the cavity and electrically bonded to the interconnection circuitry using conventional bonding techniques. In another alternative, the components may be first connected electrically and mounted as a unit on a suitable carrier prior to being inserted into cavity  424 . 
     With reference now to FIG. 4C, the cavity  424  is filled with an ultraviolet (UV) curable resin or a similar potting compound. Once cured, the exposed compound  432  is milled or shaved flush with the surface of core member  420 . This may be accomplished using a diamond impregnated fly cutter. 
     Turning next to FIG. 4D, a second core member  434  is printed with appropriate graphics and laminated with overlay  436 . Core member  434  has a thickness of approximately 5 mils, which is about the minimum for use with existing printing and laminating processes. 
     The core members  420  and  434  are joined together as shown in FIG. 4E. A hot lamination process may be used; however, the electronic components, particularly battery  426 , may suffer adversely in such a process. In this case, core members  420  and  434  may be joined with a cold lamination process or may be glued together with a suitable adhesive. Acceptable adhesives are available that can join the core members at a temperature of only about 100° F., which is low enough to avoid damage to the electronic components. The finished card has a thickness of approximately 32.6 mils, close to the nominal 32 mil thickness established by ISO standards and well within the allowable tolerance. 
     Although FIGS. 4A-4E illustrate the manufacturer of a single card, it will be understood that a plurality of cards may be processed simultaneously in sheets and that the sheets may then be cut into individual cards after the process is complete. Also, while cavity  424  is shown as being formed in core member  420 , cooperating cavities may be formed in the two core members, in which case they may be equal, or nearly so, in thickness. 
     As mentioned above, the completed card may include an integral magnifying lens, if desired. If so, core members  420  and  434  are preferably formed of a clear plastic material as described in the referenced patents. The graphic design imprinted on the surfaces of the core members will, of course, leave a transparent window where the lens is to be located. The lens may be formed by hot stamping fresnel contours as described in the referenced patents. Further processing of the card, such as embossing, the addition of holograms, magnetic stripes, etc. is accomplished in the same manner as for the previously patented embodiments. As mentioned above, appropriate care is taken to locate electronic components  430  in areas of the card that will not be subject to embossing. 
     The use of a clear plastic material for core member  420  and/or core member  434  allows formation of a collimating lens for LED  410 . An LED typically disperses light over a wide angle. A collimating lens concentrates the light within a narrower angle so that card  400  is a more effective source of illumination. A collimating lens may be formed in the same manner as a magnifying lens. It will be understood, however, that incorporation of a collimating lens for LED  410  does not require that a magnifying lens also be included in card  400 . 
     An alternative method of manufacturing card  400  is basically similar to the previously described method; however, the split core members are fabricated using an extrusion process. A first core member is extruded with a cavity in place. This core member is printed and laminated as in the previously described process. Furthermore, the electronic components are installed and potted in the same manner as previously described. A second core member is also extruded and is then laminated to the completed first core member. 
     It will be recognized that the above-described invention may be embodied in other specific forms without departing from the spirit or essential characteristics of the disclosure. Thus, it is understood that the invention is not to be limited by the foregoing illustrative details, but rather is to be defined by the appended claims.