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A card-type electronic key having a high level of portability and including an emergency mechanical key that is difficult to duplicate. The electronic key is used with a communication controller arranged in a vehicle. The electronic key includes a communication circuit unit which transmits a wireles

A card-type electronic key having a high level of portability and including an emergency mechanical key that is difficult to duplicate. The electronic key is used with a communication controller arranged in a vehicle. The electronic key includes a communication circuit unit which transmits a wireless signal including an authentication code. The communication circuit unit is allowed to control an external device arranged on the subject when the communication controller receiving the wireless signal determines that the verification code is authentic. A key card unit includes a verification code pattern formed by through holes. A concealment film is removably adhered to the key card unit and conceals the through holes so that the through holes cannot be seen.

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1. A card-type electronic key provided with an emergency mechanical key, for use with a communication controller arranged in a subject remote from the card-type electronic key, the card-type electronic key comprising: first and second card regions forming a planar card body;a communication circuit u

1. A card-type electronic key provided with an emergency mechanical key, for use with a communication controller arranged in a subject remote from the card-type electronic key, the card-type electronic key comprising: first and second card regions forming a planar card body;a communication circuit unit embedded in the first card region, including an electronic key transceiver circuit which transmits a wireless signal including an authentication code and which provides backup power for the card-type electronic key, in which the communication circuit unit is allowed to control an external device arranged on the subject when the communication controller receiving the wireless signal determines that the verification code is authentic;a verification code pattern in the second card region, formed by a plurality of through holes or a plurality of recesses extending in a thickness-wise direction of the second card region; anda concealment film which is removably adhered only to the second card region and which conceals the plurality of through holes or the plurality of recesses so that the through holes or recesses cannot be seen, wherein after the concealment film is removed from the second card region, the second card region functions as a key blade of the emergency mechanical key while the first card region functions as a key head of the emergency mechanical key. 2. The card-type electronic key according to claim 1, wherein: the concealment film includes a non-adhesive region which eases removal of the concealment film from the key card unit. 3. The card-type electronic key according to claim 2, wherein: the second card region includes corners; and the non-adhesive region is defined by a corner of the concealment film arranged at a location separated from the corners of the second card region. 4. The card-type electronic key according to claim 1, wherein the concealment seal has an adhesive capability set so that once the concealment film is removed from the key card unit, the concealment film cannot be adhered to the key card unit again. 5. The card-type electronic key according to claim 1, wherein: the concealment film includes an outer surface on which a primary aesthetic surface is formable by printing a character, a symbol, a line, or a graphical design; and the key card unit includes an outer surface on which a secondary aesthetic surface is formable by printing a character, a symbol, a line, or a graphical design. 6. The card-type electronic key according to claim 1, wherein the key card unit includes a notch which eases removal of the concealment film from the key card unit. 7. The card-type electronic key according to claim 1, wherein the concealment film is formed from a material having a brittleness that is adjusted to leave a removal trace when the concealment seal is removed from the key card unit. 8. The card-type electronic key according to claim 1, wherein the concealment film is a non-conductive body. 9. A card-type electronic key provided with an emergency mechanical key for use with a communication controller arranged in a subject remote from the card-type electronic key, the card-type electronic key comprising: first and second card regions forming a planar card, whereinthe first card region includes a communication circuit unit which transmits a wireless signal including an authentication code, in which the communication circuit unit includes an electronic key-transceiver circuit which provides backup power for the card-type electronic key and in which the communication circuit unit is allowed to control an external device arranged on the subject when the communication controller receiving the wireless signal determines that the verification code is authentic;the second card region includes a mechanical, unpowered key card surface including a verification code pattern formed by a plurality of through holes or a plurality of recesses extending in a thickness-wise direction of the second card region; anda concealment film which is removably adhered only to the mechanical card key surface of the second card region and which conceals the plurality of through holes or the plurality of recesses of the verification code pattern so that the through holes or recesses cannot be seen, wherein after the concealment film is removed from the second card region, the second card region functions as a key blade of the emergency mechanical key while the first card region functions as a key head of the emergency mechanical key. 10. A card-type electronic key, comprising: a first card region including a communication circuit unit which wirelessly transmits an ID code signal;a second card region including a surface flush with an outer surface of the first card region, the surface of the second card region including a verification code pattern formed by a plurality of through holes or a plurality of recesses extending in a thickness-wise direction of the second card region, the first and second card regions forming a planar card body; anda concealment film removably adhered only to the second card region to conceal the verification code pattern, wherein after the concealment film is removed from the second card region, the second card region functions as a key blade of an emergency mechanical key while the first card region functions as a key head of the emergency mechanical key. 11. The card-type electronic key according to claim 10, further comprising: a coating film adhered to the first card region to cover the communication circuit unit, wherein the concealment film is flush with the coating film.