JP4660972B2 - Wireless communication method, wireless communication program, storage medium, and vending machine using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wireless communication method, a wireless communication program, a storage medium, and a vending machine using these.
[0002]
[Prior art]
Recently, a technique for directly performing wireless communication between a portable terminal (such as a mobile phone or a portable information device PDA) and a vending machine has been proposed.
[0003]
The wireless communication procedure will be described in detail. (1) A user operates a mobile terminal to connect to a vending machine that desires to purchase a product by two-way wireless communication. (2) The user operates the mobile terminal to input a key for purchasing a product. (3) When receiving the key input signal from the portable terminal, the vending machine pays out a product corresponding to the key input signal and outputs a payout end signal. (4) The user can obtain the desired product. When the user confirms that the mobile terminal has received the payout end signal from the vending machine, the user operates the mobile terminal to disconnect the wireless communication with the vending machine. That's it. Note that the payment method when the user obtains the product may be any of cash, advance payment card, bank withdrawal, and the like.
[0004]
[Problems to be solved by the invention]
However, the radio wave intensity for performing wireless communication between the portable terminal and the vending machine is relatively wide (for example, a radius of about 100 m) around the installation location of the vending machine in consideration of the effect of attracting customers. Therefore, the following problems occur.
[0005]
In other words, the key input signal from the user who faces the vending machine may be prioritized over the key input signal from other users who are further away from the vending machine. There was a problem that caused discomfort to the users in the front.
[0006]
Therefore, an object of the present invention is to provide a wireless communication method, a wireless communication program, a storage medium, and a vending machine using these without causing discomfort to the user.
[0007]
[Means for Solving the Problems]
The present invention has been created to solve the above problems.
[0008]
Claim 1 is a wireless communication method between a vending machine and a portable terminal using a first wireless medium and a second wireless medium having a shorter maximum communication distance than the first wireless medium, wherein the vending machine Transmitting product information using the first wireless medium, and transmitting a purchase request signal for responding to the product information using the first wireless medium, to the vending machine, the portable terminal. The vending machine transmits a purchase confirmation signal in response to the purchase request signal using the second wireless medium; and the portable terminal uses the second wireless medium to the vending machine. Transmitting a purchase decision signal in response to the purchase confirmation signal, and enabling the vending machine to identify the portable terminal and sell the product based on the purchase request signal and the purchase decision signal And consists of
  The vending machine includes holding means for holding a purchase request signal from the mobile terminal for a predetermined time, and when receiving the purchase decision signal from the mobile terminal within the predetermined time, Delete the remaining purchase request signals that do not correspond to this purchase decision signalIs.
  According to the first aspect, since the vending machine switches from the first wireless medium to the second wireless medium and receives the signal from the portable terminal in two stages, the product is given priority to the user facing the vending machine. The effect that can be sold.In addition, since the users are updated at regular intervals, there is an effect of securing new users and increasing customer collection efficiency. Furthermore, there is an effect that the product can be reliably sold to the user who transmitted the purchase decision signal earliest.
[0013]
Claim2Claims1Therefore, the vending machine transmits a notification signal for notifying that the purchase request signal is deleted to the portable terminal corresponding to the remaining purchase request signal. This claim2According to the above, there is an effect that the user can efficiently retransmit the purchase request signal.
[0014]
Claim3Claims1 or 2Therefore, the first wireless medium is radio waves, and the second wireless medium is infrared rays. This claim3According to the above, since communication is performed by switching between different wireless media between the vending machine and the portable terminal, there is an effect that the erroneous transmission and reception of signals can be surely prevented.
[0015]
Claim4Is a vending machine that performs wireless communication for selling products with a mobile terminal using a first wireless medium and a second wireless medium having a shorter maximum communication distance than the first wireless medium, Transmission / reception means for transmitting / receiving signals to / from the portable terminal, wireless medium switching means for switching between the first wireless medium and the second wireless medium, and control means for selling products. The transmission / reception means transmits product information using the first wireless medium, and receives a purchase request signal in response to the product information from the portable terminal, the second transmission / reception means according to the switching output of the wireless medium switching means. A purchase confirmation signal is transmitted using a wireless medium, and the control means receives the purchase decision signal in response to the purchase confirmation signal from the portable terminal when the transmission / reception means receives the purchase confirmation signal and the purchase decision signal. Based on the signal, and can sell goods as well as identifying the mobile terminalAnd holding means for holding a purchase request signal from the portable terminal for a predetermined time, and when the transmission / reception means receives the purchase decision signal from the portable terminal within the predetermined time, the holding means Delete remaining purchase request signals that do not correspond to purchase decision signalsTo do.
  This claim4According to the above, since the signal from the portable terminal is received in two stages by switching from the first wireless medium to the second wireless medium, there is an effect that the product can be preferentially sold to the user facing the vending machine.In addition, since the users are updated at regular intervals, there is an effect of securing new users and increasing customer collection efficiency. Furthermore, there is an effect that the product can be reliably sold to the user who transmitted the purchase decision signal earliest.
[0020]
Claim5Claims4Therefore, the transmission / reception means transmits a notification signal for notifying the portable terminal corresponding to the remaining purchase request signal that the purchase request signal has been deleted. This claim5According to the above, there is an effect that the user can efficiently retransmit the purchase request signal.
[0021]
Claim6Claim 4Or 5Therefore, the first wireless medium is radio waves, and the second wireless medium is infrared rays. This claim6According to the above, since communication is performed by switching between different wireless media with the mobile terminal, there is an effect that it is possible to reliably prevent erroneous transmission / reception of signals.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
Details of the present invention will be specifically described with reference to the drawings.
[0029]
FIG. 1 is a front view of a vending machine according to the present invention. For example, a can beverage is sold.
[0030]
In FIG. 1, the front door 1 opens and closes with the left side end of the vending machine as a support shaft, and is unlocked and opened when performing column setting, can beverage replenishment, etc., and locked during normal sales. And keep it closed. The panel 2 is a transparent resin plate for confirming a plurality of types of can beverage samples 3 displayed inside. That is, the user can select a can beverage to be purchased by looking over a plurality of types of can beverage samples 3 through the panel 2. The coin insertion slot 4 is a portion where a user inserts coins, and the inserted coins are supplied to a coin mechanism inside the vending machine. The bill insertion slot 5 is a portion where a user inserts a bill, and the inserted bill is supplied to a bill burr inside the vending machine. The display unit 6 (organic EL, LCD, LED, etc.) displays the inserted coin amount, the inserted bill amount, and the like. The product selection button 7 has a built-in sale lamp and a sold-out lamp, and is provided on the panel 2 corresponding to each can beverage sample 3. The ready-to-sell lamp is compatible with canned drinks only when the canned drinks are stored in the column inside the vending machine when the user inserts coins or inserts banknotes so that the user can purchase at least one canned drink. Lights up. As for the sold-out lamp, when the predetermined column in the vending machine becomes empty, the one corresponding to the can beverage is always lit. When the product selection button 7 with the sale ready lamp lit is pressed, the can beverage corresponding to the can beverage sample 3 is carried out to the product outlet 8. The return lever 9 is for returning the inserted coin from the return slot 10 or returning the change obtained by subtracting the can beverage purchase amount from the inserted coin or the inserted bill from the return slot 10. The window part 11 is a light receiving / emitting part of a signal when performing infrared communication with a portable terminal.
[0031]
FIG. 2 is a diagram for explaining the operation of the vending machine of the present invention.
[0032]
In FIG. 2, a main control unit 101 controls the vending machine, and includes a ROM, a CPU, a RAM, and peripheral circuits (counter, etc.). More specifically, the ROM stores in advance program data for overall control of a plurality of sub-control units to be described later, and the CPU controls a plurality of sub-controls according to the result of decoding the program data read from the ROM. The RAM performs overall control of the units, and the RAM writes or reads out the calculation results by the CPU and various data from the plurality of sub-control units. On the hardware side, the ROM is a mask ROM that burns and fixes data in the manufacturing process, an EPROM that can repeatedly write and read data by erasing the data with ultraviolet light, or an EEPROM that can repeatedly write and read data by electrically erasing the data ( A nonvolatile memory such as a flash ROM). The CPU includes a program counter for designating an execution address of the ROM, an instruction decoder for decoding the contents read from the ROM, an arithmetic logic unit for performing a logical operation, an accumulator for temporarily storing operation data, and the like. The RAM is a volatile memory such as SRAM, and retains stored contents using a backup power source.
[0033]
The coin processing control unit 102, the banknote processing control unit 103, the customer service control unit 104, the sales control unit 105, the input / output control unit 106, the communication unit 107, and the communication unit 108 correspond to a plurality of sub control units, and in terms of hardware The same ROM, CPU and RAM as the main control unit 101 are incorporated. The coin insertion mechanism 109 is provided with a change change sensor for detecting change change, receives the input coin from the coin insertion slot 4, and returns change from the return slot 10 as necessary. The coin processing control unit 102 controls the coin insertion mechanism 109 to determine the type and correctness of the inserted coin, calculate the number of denominations, store surplus coins in the safe, and change money. . As with the coin insertion mechanism 109, the bill insertion mechanism 110 includes a bill-out sensor that detects when a bill is out, receives an inserted bill from the bill insertion slot 5, and removes a bill from the bill insertion slot 5 as necessary. I will return it. The banknote processing control unit 103 controls the banknote insertion mechanism 110 to determine the inserted banknote denomination, correctness, etc., calculate the number of denominations, and pay out a bill. The coin processing control unit 102 and the banknote processing control unit 103 execute a processing operation each time coin insertion and banknote insertion are performed. The coin processing control unit 102 and the coin insertion mechanism 109 constitute a coin mechanism, and the bill processing control unit 103 and the bill insertion mechanism 110 constitute a bill burr. However, instead of the coin mechanism and the bill burr, a prepaid card or a postpaid card is inserted. You may enable it to sell a cup drink by providing a card reader (not shown). The customer service surface 111 includes a display unit 6, a product selection button 7, a sales lamp (not shown), a sales stop lamp (not shown), and a change-out lamp (not shown). The customer service control unit 104 controls the customer service surface 111. That is, the customer service control unit 104 turns on the above-mentioned sales lamp, sales stop lamp, and change-out lamp according to the customer service instruction regarding the can beverage sales from the main control unit 101, or sells the product selection button 7 for each beverage sold. The enabling lamp or the sold-out lamp is turned on, and further, it is detected which of the plurality of product selection buttons 7 is pressed, and a detection signal at this time is transmitted to the main control unit 101. The sales mechanism 112 carries out canned beverages to the product outlet 8. The sales control unit 105 controls the sales mechanism 112, and the can desired by the user according to the sales instruction from the main control unit 101 in response to the detection signal from the customer service control unit 104 or the product request signal from the communication unit 107. The beverage is carried out to the product outlet 8.
[0034]
The keyboard 113 is provided with a numeric keypad and function keys, and a display unit (organic EL, LCD, etc.) for displaying contents related to the operation of these keys on the front surface. The keyboard 113 has a built-in input / output control unit 106 connected in a wired manner and is detachably disposed on the back surface of the front door 1 and is operated when performing column setting, amount setting, maintenance, etc. for canned beverages. To do. The input / output control unit 106 transmits input information from the keyboard 113 to the main control unit 101. Based on this input information, the main control unit 101 instructs each of the coin processing control unit 102, the banknote processing control unit 103, the customer service control unit 104, the sales control unit 105, and the communication unit 108.
[0035]
The communication unit 107 (transmission / reception means) includes a radio wave communication unit 114 that transmits and receives signals using radio waves (first wireless medium), an infrared communication unit 115 that transmits and receives signals using infrared rays (second radio medium), and radio waves A switching unit 116 (a wireless medium switching unit) that selects either the communication unit 114 or the infrared communication unit 115 is provided, and bidirectional wireless communication is performed with the mobile terminal. The radio wave communication unit 114 performs short-range wireless communication with a radius of about 100 m, and it is preferable to use a first wireless medium based on a standard such as Bluetooth. The radio wave communication unit 114 works effectively when attracting an unspecified number of users. The infrared communication unit 115 performs short-range wireless communication with a mobile terminal at a facing distance of about 1 m, and it is preferable to use a second wireless medium based on a standard such as IrDA. Since the infrared communication unit 115 has high directivity of infrared rays, the infrared communication unit 115 works effectively when limiting users facing the vending machine. Further, the switching unit 116 switches the radio wave communication unit 114 or the infrared communication unit 115 to either one according to the wireless medium switching signal from the main control unit 101. More specifically, first, the switching unit 116 selects the radio communication unit 114, and the radio communication unit 114 transmits product information for advertising the product. When the user is within a radius of 100 m centering on the vending machine, the product information can be confirmed on the screen of the mobile terminal, and a purchase request signal is transmitted to the radio wave communication unit 114 as necessary. It is assumed that the purchase request signal is a unique ID code for identifying each portable terminal. When receiving the purchase request signal, the radio wave communication unit 114 transmits the purchase request signal to the main control unit 101. The main control unit 101 holds all received purchase request signals in a RAM (holding unit) for a predetermined time (for example, 5 minutes), and also switches a wireless medium switching signal for switching from the radio wave communication unit 114 to the infrared communication unit 115. Is transmitted to the switching unit 116. The switching unit 116 selects the infrared communication unit 115, and the infrared communication unit 115 transmits a purchase confirmation signal. The previous user can check the purchase confirmation signal on the screen of the mobile terminal by moving from a radius of 100m centered on the vending machine to 1m facing the vending machine by car, bicycle, walking, etc. A purchase decision signal is transmitted to the infrared communication unit 115 as necessary. Note that the purchase decision signal has the same ID code as the purchase request signal. When receiving the purchase decision signal, the infrared communication unit 115 transmits the purchase determination signal to the main control unit 101. The main control unit 101 compares all the received purchase request signals with the earliest purchase determination signal to identify the portable terminal, and enables the can beverage to be sold. When the main control unit 101 receives the purchase determination signal within the predetermined time, the main control unit 101 deletes the remaining purchase request signal that does not correspond to the purchase determination signal without holding it.
[0036]
The communication unit 108 is connected to a host computer of a vending machine management company or a server on the Internet via a communication line. The communication unit 108 transmits information on various tables stored in the RAM of the main control unit 101 to the above-described host computer, server, and the like. As a result, the management company of the vending machine can execute a sales promotion activity in which new products, popular products, etc. are guided in real time to the mobile terminal of the user.
[0037]
The communication between the main control unit 101 and the sub control units 102 to 108 is a polling method in which the main control unit 101 has a preferential transmission right, or the main control unit 101 and the sub control units 102 to 108 are equal. Any contention method having a right to transmit can be used.
[0038]
FIG. 3 is an overall view for explaining the wireless communication method of the present invention.
[0039]
In FIG. 3, a vending machine 201 has the configuration shown in FIGS. 1 and 2, and is installed in the jurisdiction of a vending machine management company. The mobile terminal 202 is a mobile phone owned by a user, a personal digital assistant PDA (Personal Digital Assistant), or the like. The portable terminal 202 has a communication unit (not shown) equivalent to the radio wave communication unit 114 and the infrared communication unit 115, and performs wireless communication using the same wireless medium as that used by the vending machine 201. The vending machine management server 203 is one Web on the Internet 204 operated by a vending machine management company, and is connected to the vending machine 201 and the portable terminal 202 via a communication line 205. The vending machine management server 203 has a wireless communication program for the vending machine 201 and a wireless communication program for the mobile terminal 202 for performing wireless communication between the vending machine 201 and the mobile terminal 202. And First, the rootman inputs a key for acquiring a wireless communication program for the vending machine 201 on the keyboard 113. Then, the main control unit 101 connects the communication unit 108 and the vending machine management server 203 via the communication line 205 in response to the key input signal, and downloads a wireless communication program for the vending machine 201. Store in ROM or RAM. On the other hand, the user inputs a key for acquiring a wireless communication program for the mobile terminal 202 on the mobile terminal 202. Then, the mobile terminal 202 communicates with the vending machine management server 203 via the communication line 205, downloads the wireless communication program for the mobile terminal 202, and stores it in the internal memory. Thereby, wireless communication between the vending machine 201 and the portable terminal 202 becomes possible.
[0040]
Note that a storage medium storing a wireless communication program for the vending machine 201 and a storage medium storing a wireless communication program for the portable terminal 202 are prepared in advance, and the vending machine 201 and the portable terminal 202 store these memories. A medium may be attached to perform wireless communication.
[0041]
FIG. 4 is a diagram for explaining an operation flow of the wireless communication method of the present invention.
[0042]
First, the switching unit 116 has selected the radio wave communication unit 114, and the radio wave communication unit 114 is in accordance with a communication instruction from the main control unit 101, “beverage ○, Δ... On sale”, “coffee beverage ○ , Is a new release. "," Soda drink △, low calorie is popular.
Etc. "is sent.
[0043]
Now, assuming that the owners A, B, and C of the mobile terminal 202 are within a radius of 100 m centering on the vending machine 201, the product information can be confirmed on the screen of the mobile terminal 202. Assume that owners A, B, and C input merchandise request keys after confirming product information according to screen guidance based on the wireless communication program for mobile terminal 202. The three portable terminals 202 transmit ID codes (A), (B), and (C) (purchase request signals) in response to key input. Hereinafter, the owner is referred to as a user.
[0044]
When the radio wave communication unit 114 receives the ID codes (A), (B), and (C) from the portable terminal 202, the radio wave communication unit 114 transmits the ID codes to the main control unit 101. When the main control unit 101 receives the ID codes (A), (B), and (C) from the radio wave communication unit 114, the main control unit 101 stores the ID codes in the RAM for a certain period of time. Further, when the main control unit 101 counts several seconds from the reception of the first ID code from the radio wave communication unit 114, the main control unit 101 sends a wireless medium switching signal for switching from the radio wave communication unit 114 to the infrared communication unit 115 to the switching unit 116. Send. Thus, the switching unit 116 selects the infrared communication unit 115 in accordance with the wireless medium switching signal from the main control unit 101, and “determines the beverage to purchase” in accordance with the communication instruction from the main control unit 101. Send purchase confirmation signal.
[0045]
Thereafter, if the users A and B move from within a radius of 100 m centering on the vending machine 201 to within 1 m facing the vending machine 201, the purchase confirmation signal can be confirmed on the screen of the mobile terminal 202. Become. It is assumed that users A and B confirm a purchase confirmation signal according to screen guidance based on the wireless communication program for mobile terminal 202 and then input a key related to purchase determination. In response to the key input, the two portable terminals 202 transmit a combination (purchase determination signal) of the can beverage designation signals (A) and (B) and the ID codes (A) and (B).
[0046]
When the infrared communication unit 115 first receives the combination of the can beverage designation signal (A) and the ID code (A) from the portable terminal 202, the infrared communication unit 115 transmits the combination to the main control unit 101. When the main control unit 101 identifies the mobile terminal 202 of the user A by sequentially comparing the ID code (A), (B), and (C) in the RAM with the ID code (A) currently received, Even so, the remaining can beverage designation signals (B) and ID codes (B) (C) in the RAM are deleted. Further, the infrared communication unit 115 transmits a notification signal such as “Please input again” according to the communication instruction from the main control unit 101. Since the user B is within 1 m facing the vending machine 201, the notification signal can be confirmed on the screen of the portable terminal 202. When the user C moves from a radius of 100 m around the vending machine 201 to 1 m facing the vending machine 201, the user C can check the notification signal on the screen of the portable terminal 202.
[0047]
When the user A inserts coins enough to purchase canned beverages into the coin insertion slot 4 or inserts banknotes into the banknote insertion slot 5, the main control unit 101 receives a coin insertion signal or a banknote from the coin processing control unit 102. The bill insertion signal from the processing control unit 103 is received, and the can beverage designation signal (A) is transmitted to the sales control unit 105. The sales mechanism 112 pays out the can beverage corresponding to the can beverage designation signal (A) from the sales control unit 105 and carries it out to the product outlet 8. Thus, user A can pick up the desired canned beverage.
[0048]
When the main control unit 101 receives the sales end signal from the sales control unit 105, the main control unit 101 transmits a wireless medium switching signal for switching from the infrared communication unit 115 to the radio wave communication unit 114 to the switching unit 116. The switching unit 116 selects the radio wave communication unit 114 according to the wireless medium switching signal from the main control unit 101, and the radio wave communication unit 114 transmits the product information according to the communication instruction from the main control unit 101 and performs the above operation. repeat.
[0049]
【The invention's effect】
The present invention has the following advantages.
[0050]
Claim 1 is a wireless communication method between a vending machine and a portable terminal using a first wireless medium and a second wireless medium having a shorter maximum communication distance than the first wireless medium, wherein the vending machine Transmitting product information using the first wireless medium, and transmitting a purchase request signal for responding to the product information using the first wireless medium, to the vending machine, the portable terminal. The vending machine transmits a purchase confirmation signal in response to the purchase request signal using the second wireless medium; and the portable terminal uses the second wireless medium to the vending machine. Transmitting a purchase decision signal in response to the purchase confirmation signal, and enabling the vending machine to identify the portable terminal and sell the product based on the purchase request signal and the purchase decision signal And consists of
  The vending machine includes holding means for holding a purchase request signal from the mobile terminal for a predetermined time, and when receiving the purchase decision signal from the mobile terminal within the predetermined time, Delete the remaining purchase request signals that do not correspond to this purchase decision signalIs. Therefore, since the vending machine switches from the first wireless medium to the second wireless medium and receives the signal from the portable terminal in two stages, the product can be preferentially sold to the user who faces the vending machine.In addition, since users are updated at regular intervals, it is possible to secure new users and increase customer collection efficiency. Further, the product can be reliably sold to the user who transmitted the purchase decision signal earliest.
[0055]
Claim2Claims1Therefore, the vending machine transmits a notification signal for notifying that the purchase request signal is deleted to the portable terminal corresponding to the remaining purchase request signal. Therefore, the user can retransmit the purchase request signal efficiently.
[0056]
Claim3Claims1 or 2Therefore, the first wireless medium is radio waves, and the second wireless medium is infrared rays. Therefore, since different wireless media are switched and communicated between the vending machine and the portable terminal, erroneous transmission / reception of signals can be reliably prevented.
[0057]
Claim4Is a vending machine that performs wireless communication for selling products with a mobile terminal using a first wireless medium and a second wireless medium having a shorter maximum communication distance than the first wireless medium, Transmission / reception means for transmitting / receiving signals to / from the portable terminal, wireless medium switching means for switching between the first wireless medium and the second wireless medium, and control means for selling products. The transmission / reception means transmits product information using the first wireless medium, and receives a purchase request signal in response to the product information from the portable terminal, the second transmission / reception means according to the switching output of the wireless medium switching means. A purchase confirmation signal is transmitted using a wireless medium, and the control means receives the purchase decision signal in response to the purchase confirmation signal from the portable terminal when the transmission / reception means receives the purchase confirmation signal and the purchase decision signal. Based on the signal, and can sell goods as well as identifying the mobile terminalAnd holding means for holding a purchase request signal from the portable terminal for a predetermined time, and when the transmission / reception means receives the purchase decision signal from the portable terminal within the predetermined time, the holding means Delete remaining purchase request signals that do not correspond to purchase decision signalsTo do. Therefore, since the signal from the portable terminal is received in two stages by switching from the first wireless medium to the second wireless medium, the product can be preferentially sold to the user facing the vending machine.In addition, since users are updated at regular intervals, it is possible to secure new users and increase customer collection efficiency. Further, the product can be reliably sold to the user who transmitted the purchase decision signal earliest.
[0062]
Claim5Claims4Therefore, the vending machine transmits a notification signal for notifying that the purchase request signal is deleted to the portable terminal corresponding to the remaining purchase request signal. Therefore, the user can retransmit the purchase request signal efficiently.
[0063]
Claim 6 claims4 or 5In this regard, the first wireless medium is a radio wave, and the second wireless medium is an infrared ray. Therefore, since different wireless media are switched and communicated between the vending machine and the portable terminal, erroneous transmission / reception of signals can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is a front view of a vending machine according to the present invention.
FIG. 2 is a diagram for explaining the operation of the vending machine according to the present invention.
FIG. 3 is an overall view for explaining a wireless communication method of the present invention.
FIG. 4 is a diagram for explaining an operation flow of the wireless communication method of the present invention.
[Explanation of symbols]
101 Main control unit
102 Coin processing control unit
103 banknote processing control unit
104 Customer Service Control Department
105 Sales Control Department
106 Input / output control unit
107 Communication Department
108 Communication Department
114 Radio Communication Department
115 Infrared communication part
116 switching part
201 vending machine
202 Mobile terminal
203 Vending machine management server

Claims (6)

A wireless communication method between a vending machine and a portable terminal using a first wireless medium and a second wireless medium having a maximum communication distance shorter than the first wireless medium,
The vending machine transmits product information using the first wireless medium;
The portable terminal transmitting to the vending machine a purchase request signal that responds to the product information using the first wireless medium;
The vending machine transmits a purchase confirmation signal in response to the purchase request signal using the second wireless medium;
The portable terminal transmitting to the vending machine a purchase decision signal in response to the purchase confirmation signal using the second wireless medium;
The vending machine, on the basis of the purchase request signal and the purchase decision signal; and salable products with identifying the mobile terminal, formed Ri from
The vending machine includes holding means for holding a purchase request signal from the mobile terminal for a predetermined time, and when receiving the purchase decision signal from the mobile terminal within the predetermined time, A wireless communication method, wherein a remaining purchase request signal not corresponding to the purchase decision signal is deleted.   The wireless communication method according to claim 1, wherein the vending machine transmits a notification signal for notifying that the purchase request signal is deleted to a portable terminal corresponding to the remaining purchase request signal.   The wireless communication method according to claim 1 or 2, wherein the first wireless medium is a radio wave, and the second wireless medium is an infrared ray. A vending machine that performs wireless communication for selling a product with a mobile terminal using a first wireless medium and a second wireless medium having a maximum communication distance shorter than the first wireless medium,
Transmitting and receiving means for transmitting and receiving signals to and from the portable terminal;
Wireless medium switching means for switching between the first wireless medium and the second wireless medium;
Control means for selling the product,
When the transmission / reception means transmits product information using the first wireless medium and receives a purchase request signal in response to the product information from the portable terminal, the second wireless communication means according to the switching output of the wireless medium switching means. Send a purchase confirmation signal using the medium,
When the transmission / reception means receives a purchase decision signal in response to the purchase confirmation signal from the portable terminal, the control means specifies the portable terminal and selects a product based on the purchase request signal and the purchase decision signal. Made available for sale,
Holding means for holding a purchase request signal from the portable terminal for a predetermined time, and when the transmitting / receiving means receives the purchase decision signal from the portable terminal within the fixed time, the holding means determines the purchase decision A vending machine characterized by deleting the remaining purchase request signals not corresponding to the signals.   5. The vending machine according to claim 4, wherein the transmission / reception means transmits a notification signal for notifying that the purchase request signal is deleted to a portable terminal corresponding to the remaining purchase request signal.   The vending machine according to claim 4 or 5, wherein the first wireless medium is radio waves and the second wireless medium is infrared rays.

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