JP2012099141A - Data code reader and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data code reader capable of stably reading even a data code of a commodity or a data code of a coupon displayed on a screen of a portable telephone terminal.SOLUTION: When the data code reader is set to a normal control mode, the reader performs imaging control to an imaging device at a preset imaging speed for minimizing an image-shake and performs lighting control to an illumination part. When the mode is switched to a coupon control mode, the reader performs imaging control to the imaging device at an imaging speed slower than the preset imaging speed which is set according to a lighting intensity of a data code on a screen of a portable telephone terminal illuminated by light of a back-light provided on its liquid crystal display in the case where the portable telephone terminal has a transmission type liquid crystal display, performs extinction control to the illumination part and returns to the normal control mode after imaging the data code displayed on the screen of the portable telephone terminal.

Description

  The present invention relates to a data code reading apparatus and method for reading a data code such as a bar code displayed on a product or a data code such as a coupon for discounting a product.

For example, in a store such as a supermarket or a convenience store, a coupon ticket, which is a cash voucher, is issued in order to promote the sale of products. The coupon is collected at the time of payment and used to discount a predetermined amount described in the coupon at a POS (Point of Sales) terminal or the like. Many of these coupons can be used only at issuing stores and issuing chains. Issuing coupons is a very effective sales promotion method for stores and chains.
On the other hand, personal portable information terminals and mobile phones called PDAs (Personal Digital Assistants) having a communication function are rapidly spreading. These portable information terminals and mobile phones are equipped with special functions for Internet operations such as browsing functions, can be connected to the Internet wirelessly or by wire, and can receive various services. I have to.
For example, Patent Document 1 is an example of a service provided to a mobile phone or the like. This patent document 1 distributes electronic data such as a data code representing a coupon ticket to a mobile phone terminal, displays it on the screen of the mobile phone terminal, and presents the coupon ticket displayed on the screen of the mobile phone terminal. It is disclosed that the data code is read by a scanner connected to the POS terminal, and the discount processing is performed from the settlement amount of the sale merchandise by the read data code of the coupon.
By the way, a product sales data processing system (POS system) equipped with a POS terminal such as an electronic cash register is installed at a corner for product checkout in a sales store such as a supermarket or a convenience store. In addition, a label or the like on which a data code such as a barcode indicating the price of the product is printed is attached to the product. The POS terminal is provided with an imaging unit for reading a data code (hereinafter abbreviated as a product data code) printed on a label or the like attached to the product.
When a product checkout operation is performed, a shopping basket is placed on the upstream side of the lane provided in the product checkout corner. In the shopping basket, for example, a plurality of products that the shopper wants to purchase are put. The cashier takes out products one by one from the shopping basket, causes the data codes of these products to be read toward the imaging unit, and performs product registration for each product. When the registration of these products is completed, the cashier sequentially puts the products for which the products have been registered into another shopping basket placed downstream on the lane.

JP 2002-260100 A (Patent Registration No. 3773167)

  When registering a product by reading the data code of the product toward the imaging unit, the cashier takes the product out of the shopping basket and directs it to the imaging unit to check the reading of the data code of the product and in another shopping basket. Therefore, the image pickup unit of the POS terminal picks up an image of the data code of the commodity moving in front of the image pickup unit. For this reason, it is desirable for the imaging unit to set the shutter speed to an appropriate shutter speed as fast as possible, for example, about 1/5000 second in order to reduce imaging blur.

  However, when the shutter speed of the imaging unit is increased, the brightness of the acquired image data is insufficient. To compensate for this, the imaging unit is provided with a backlight type illumination device. As this lighting device, for example, an LED or the like is generally used. However, even when the coupon code data code is displayed on the screen of the mobile phone terminal and the coupon code data code is read and discount processing is performed, the illumination unit of the imaging unit performs illumination and the imaging unit Image the data code.

  However, when the data code of the coupon displayed on the screen of the mobile phone terminal is imaged, it is illuminated by an illuminating device such as an LED, and an appropriate shutter as soon as possible, as in reading the data code of the product. When imaging is performed at a speed, for example, as shown in FIG. 6, a shadow 3 of a lighting device such as an LED that is lit on the screen 2 of the mobile phone terminal 1 is reflected, and a data code such as a QR code (registered trademark) 4 is read. Can not be.

  When the screen 2 of the mobile phone terminal 1 is a transmissive liquid crystal display, for example, a backlight is provided on the liquid crystal display. Since the liquid crystal display has a deflection film and a glass substrate, the backlight passes through the deflection film and the glass substrate. As a result, an image of a data code such as QR code 4 can be recognized on the liquid crystal display screen 2. On the other hand, if the external light hitting the liquid crystal display is too bright, the backlight of the liquid crystal display and the external light collide with each other, and the data code 4 on the liquid crystal display screen 2 becomes difficult to see visually. Further, illumination light from an illumination device such as an LED is specularly reflected by the glass substrate of the liquid crystal display, so that the data code 4 on the liquid crystal display screen 2 becomes difficult to visually see.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a data code reading apparatus and method that can stably read even a data code of a product or a data code of a coupon or the like displayed on a screen of a mobile phone terminal. .

  A data code reading device according to a main aspect of the present invention includes an imaging device that captures at least a data code and acquires the image data, a decoder that decodes the data code from the image data acquired by the imaging device, and at least data The illumination unit that illuminates the code, and the normal control mode for reading the data code printed on the label attached to the product, or the coupon control mode for reading the data code displayed on the screen of the mobile phone terminal When switching to the normal control mode, the mode switching unit is normally set to the normal control mode. When the mode switching unit is set to the normal control mode, the imaging device is controlled to capture at a preset imaging speed to reduce imaging blur. And turn on the lighting unit and switch to the coupon control mode. If the mobile phone terminal is a transmissive liquid crystal display, the data code on the screen of the mobile phone terminal illuminated by the backlight of the backlight provided on the liquid crystal display is slower. A control unit that controls the imaging device at an imaging speed set according to the illuminance, controls the illumination unit to be turned off, and images the data code displayed on the screen of the mobile phone terminal, and then returns to the normal control mode again. It comprises.

  A data code reading method according to a main aspect of the present invention is a data code that illuminates at least a data code, images at least the illuminated data code, acquires image data, and decodes the data code from the image data In the code reading method, it is switched to the normal control mode for reading the data code printed on the label attached to the product, or the coupon control mode for reading the data code displayed on the screen of the mobile phone terminal, Normally, the control mode is set to the normal control mode. When the control mode is set to the normal control mode, the image pickup apparatus is controlled to take an image at a preset image pickup speed for reducing the image blur, and the lighting unit is controlled to be turned on. When switched to, the mobile phone is slower than the preset imaging speed. When the terminal is a transmissive liquid crystal display, the imaging speed is set according to the illuminance of the data code on the screen of the mobile phone terminal illuminated by the backlight of the backlight provided in the liquid crystal display. After imaging control of the imaging device, the illumination unit is controlled to be turned off, and the data code displayed on the screen of the mobile phone terminal is imaged, and then the normal control mode is resumed.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a data code of goods, the data code of coupons etc. displayed on the screen of the mobile telephone terminal, the data code reader which can be read stably, and its method can be provided.

1 is a perspective view showing the overall configuration of an embodiment of a POS system using a data code reader according to the present invention. The block diagram which shows the same apparatus integrally with a POS terminal. The figure which shows the barcode of the goods imaged with the CCD image sensor of the apparatus. The figure which shows QR code displayed on the screen of the mobile telephone terminal imaged with the CCD image sensor of the apparatus. The operation | movement flowchart of the POS terminal part in the same apparatus. The figure which shows the shadow of illumination devices, such as LED reflected on the screen of a mobile telephone terminal.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of the overall configuration of a POS system using a data code reader. A data code reader 11 serving as a scanner is erected at the center of the soccer base 10. Further, a POS terminal 12 including an electronic cash register constituting a POS system is installed inside the soccer stand 10. The data code reader 11 and the POS terminal 12 are connected to each other via a transmission path (not shown) so that they can communicate with each other. The data code reader 11 and the POS terminal 12 constitute a POS terminal unit.

The POS terminal 12 is provided with a keyboard 13, a cashier display 14, a shopper display 15, a printer 16 that performs receipt printing and the like. The keyboard 13 is provided with a fastening key or the like necessary for settlement of the commodity price. Such a POS terminal 12 is typically used in this type of checkout lane system.
The data code reader 11 includes an imaging device 17 for reading a data code such as a barcode or QR code attached to a product, and various types for registering a product that cannot be registered with a barcode or QR code. A keyboard 18 provided with keys and the like, and a display 19 and the like for displaying the product name, price, etc. of the registered product for the shopper are provided. Among these, the imaging device 17 incorporates a CCD (Charge Coupled Device) image sensor, for example. Hereinafter, it is referred to as a CCD image sensor 17. The CCD image sensor 17 includes an illuminating device 20 made of an LED or the like. The illumination device 20 irradiates illumination light so as to cover the imaging area of the CCD image sensor 17.

  In addition, a shopping basket 22 containing, for example, a plurality of products 21 to be purchased by a shopper is placed upstream of the data code reader 11 on the soccer table 10. Further, another shopping basket 23 for placing the product 21 for which the product registration has been performed is placed downstream of the data code reader 11 on the soccer table 10.

  A POS server 25 as a POS processing device is connected to the POS terminal 12 via, for example, a local area network (LAN) 24 in the store. The POS server 25 exchanges information regarding the settlement process of the product 21 with the POS terminal 12 and records the settlement process result of the product 21. The POS server 25 has a product database that stores in advance data such as prices and product names of all products 21 sold in stores, and further stores coupon data such as discounts. The POS server 25 refers to the product database for the data code transmitted from the POS terminal 12 via the LAN 24, reads data such as the price and product name of the product 21 corresponding to the data code, and all the products 21. The settlement amount data is obtained by summing up the respective prices, and the settlement amount data is returned to the POS terminal 12 via the LAN 24. Further, the POS server 25 inquires the product data base of the coupon data code transmitted from the POS terminal 12 via the LAN 24, reads the discount value of the product 21 corresponding to the coupon data code, and obtains the discount value. The adjusted amount data is obtained by performing the processing in consideration, and this adjusted amount data is returned to the POS terminal 12 via the LAN 24.

  FIG. 2 shows a configuration diagram in which the data code reader 11 and the POS terminal 12 are integrated. The control unit 30 includes a CPU, ROM, RAM, and the like. The control unit 30 controls the operation of the data code reading device 11 and the POS terminal 12 when the CPU executes a program stored in the ROM. The control unit 30 is connected to the CCD image sensor 17, an illumination drive circuit 31 that lights the illumination device 20, a mode switching unit 32, and an interface 33.

  A lens 34 is provided on the front side of the CCD image sensor 17. The CCD image sensor 17 has a barcode 36 printed on a label 35 attached to a product 21 as shown in FIG. 3 through a lens 34, or a screen 2 of a mobile phone terminal as shown in FIG. The QR code 4 displayed on is imaged and the image data is output. The bar code 36 on the label 35 attached to the product 21 is the first notation form of the data code, and the QR code 4 displayed on the screen 2 of the mobile phone terminal is the second notation form of the data code. And Among these, the barcode 36 on the label 35 attached to the product 21 includes information such as the price of the product 21, for example. The QR code 4 displayed on the screen 2 of the mobile phone terminal includes coupon information such as a discount price of the product 21, for example.

The decoder 37 receives the image data output from the CCD image sensor 17 and decodes the barcode 36 or the QR code 4 from the image data.
The illuminating device 20 consists of LED, for example. The lighting device 20 is turned on or off by the lighting drive circuit 31. Moreover, the illumination device 20 can vary the intensity at which the LED is turned on by the illumination drive circuit 31.
A POS server 25 is connected to the interface 33 via the LAN 24.

  The mode switching unit 32 is displayed on the display form of the data code, that is, the normal control mode for reading the barcode 36 on the label 35 on which the data code is affixed to the product 21 or the screen 2 of the mobile phone terminal. Switch to coupon control mode for reading QR code 4. For example, the mode switching unit 32 is normally set to a normal control mode for reading the barcode 36 of the product 21. When a manual operation such as a cashier is received in the setting state of the normal control mode, the mode switching unit 32 Switch to the coupon control mode that reads the QR code 4 displayed on the screen 2. The mode switching unit 32 includes, for example, a mode switching switch that receives a manual operation such as a cashier.

  The control unit 30 controls the operation of the imaging speed of the CCD image sensor 17 and the lighting / lighting-off of the illumination device 20 in accordance with, for example, the normal control mode or the coupon control mode set in the mode switching unit 32. Specifically, if the control unit 30 is in the normal control mode, in order to read the barcode 36 on the label 35 affixed to the product 21, in order to reduce a preset imaging speed, for example, imaging blur. For example, imaging control of the CCD image sensor 17 is performed at an appropriate shutter speed as fast as possible, for example, about 1/5000 second, and the illumination device 20 is turned on.

  If the QR code 4 is displayed on the screen 2 of the mobile phone terminal, the control unit 30 controls the imaging of the CCD image sensor 17 at an imaging speed slower than a preset imaging speed, for example, 1/5000 second. At the same time, the lighting device 20 is turned off. The imaging speed of the CCD image sensor 17 at this time is, for example, when the screen 2 of the mobile phone terminal 1 is a transmissive liquid crystal display, a backlight is provided on the liquid crystal display. Is set according to the illuminance of the QR code 4 on the screen 2 of the mobile phone terminal.

  When the mode switching unit 32 switches to the coupon control mode, the control unit 30 controls the imaging of the CCD image sensor 17 at an imaging speed slower than a preset imaging speed and controls the illumination device 20. When the turn-off control is performed and the control of the CCD image sensor 17 and the illumination device 20 in the coupon control mode is completed, the normal control mode is resumed.

Next, the operation of the POS system configured as described above will be described according to the operation flowchart of the POS terminal unit shown in FIG.
The mode switching unit 32 is normally set to a normal control mode for reading the barcode 36 of the product 21.
In step # 1, the control unit 30 determines whether the mode switching unit 32 is set to the normal control mode or the coupon control mode. Since the mode switching unit 32 is normally set to the normal control mode, the control unit 30 moves to step # 2 and performs a scan to read the barcode 36 on the label 35 attached to the product 21. . That is, the control unit 30 controls the imaging of the CCD image sensor 17 with a preset imaging speed, for example, an appropriate shutter speed as fast as possible, for example, about 1/5000 sec to reduce imaging blur. At the same time, the control unit 30 turns on the lighting device 20. As a result, the CCD image sensor 17 captures an image with an appropriate shutter speed as fast as possible, for example, about 1/5000 second in a state where the illumination device 20 is lit.

At this time, the cashier takes out the product 21 from the shopping basket 22 and causes the CCD image sensor 17 to read the barcode 36 of the product 21 as shown in FIG. Then, after confirming the reading of the barcode 36 of the product 21, it is put in another shopping basket 23.
However, the CCD image sensor 17 images the barcode 36 of the product 21 as shown in FIG. 3 through the lens 34 and outputs the image data. In step # 3, the decoder 37 receives the image data output from the CCD image sensor 17 and decodes the barcode 36 from the image data. In step # 4, the control unit 30 transmits the information on the barcode 36 of the product 21 decrypted by the decoder 37 from the interface 33 to the POS server 25 via the LAN 24.

  The POS server 25 queries the product database for information on the barcode 36 of the product 21 transmitted from the POS terminal 12 via the LAN 24, and obtains data such as the price and product name of the product 21 corresponding to the data code. Read and return to the POS terminal 12 via the LAN 24.

Next, in step # 5, the control unit 30 receives and registers data such as the price and product name of the product 21 returned to the POS terminal 12 via the interface 33, and also registers the price and product name of the product 21. Is displayed on the cashier display 14 and the shopper display 15 in the POS terminal 12.
Next, in step # 6, the control unit 30 determines whether or not the tightening key in the keyboard 13 in the POS terminal 12 has been pressed. As a result of the determination, if the closing key is not pressed, the control unit 30 returns to step # 1 again and determines whether the mode switching unit 32 is set to the normal control mode or the coupon control mode. To do. When the closing key is pressed, the control unit 30 proceeds to step # 7, for example, performs a checkout process for at least one registered product 21 to obtain the total amount of purchase of the product 21, etc. The total amount of purchase is printed on a receipt by the printer 16.

On the other hand, when the shopper presents the QR code 4 displayed on the screen 2 of the mobile phone terminal 1 as shown in FIG. 4, for example, the cashier manually operates, for example, the mode switch provided in the mode switching unit 32. Then, the normal control mode is switched to the coupon control mode.
Since the control unit 30 determines in step # 1 that the mode switching unit 32 has been switched to the coupon control mode, the control unit 30 proceeds to step # 8 and reads the QR code 4 displayed on the screen 2 of the mobile phone terminal. Scan. That is, the control unit 30 controls the imaging of the CCD image sensor 17 at an imaging speed slower than a preset imaging speed, for example, 1/5000 second. At the same time, the control unit 30 turns off the lighting device 20. Thereby, the CCD image sensor 17 performs imaging at an imaging speed slower than, for example, 1/5000 second in a state where the illumination device 20 is turned off.

At this time, for example, the shopper directs the QR code 4 displayed on the screen 2 of the mobile phone terminal 1 as shown in FIG. However, in step # 9, the CCD image sensor 17 images the QR code 4 displayed on the screen 2 of the cellular phone terminal 1 through the lens 34, and outputs the image data.
Next, in step # 10, the decoder 37 inputs the image data output from the CCD image sensor 17, and decodes the QR code 4 from this image data. In step # 11, the control unit 30 transmits the information of the QR code 4 decoded by the decoder 37 from the interface 33 to the POS server 25 via the LAN 24.
The POS server 25 queries the product database for information on the QR code 4 transmitted from the POS terminal 12 via the LAN 24, reads out, for example, discount data of the product 21 corresponding to the data code, and transmits the data via the LAN 24. Reply to the POS terminal 12.

  Next, the control unit 30 receives, for example, discount data of the product 21 returned to the POS terminal 12 in step # 12 via the interface 33, and in the next step # 13, the price discount process for the product 21 is performed. I do. The price reduction process for the product 21 is set to be performed on the price included in the barcode 36 of the product 21 read immediately before the QR code 4 displayed on the screen 2 of the mobile phone terminal 1 is read. Alternatively, it may be set to be performed on the price included in the barcode 36 of the product 21 read immediately after reading the QR code 4 displayed on the screen 2 of the mobile phone terminal 1. . The control unit 30 displays the price of the product 21 that has undergone the discount process on the cashier display 14 and the shopper display 15 in the POS terminal 12.

  Next, when the discount process for the product 21 is completed, the control unit 30 returns to the normal control mode again in step # 14. Thereby, the mode switching unit 32 normally returns to the normal control mode for reading the barcode 36 of the product 21. Note that the normal control mode can be returned to any state after the QR code 4 displayed on the screen 2 of the mobile phone terminal 1 is imaged by the CCD image sensor 17 through the lens 34 with the illumination device 20 turned off. It may be timing.

  As described above, according to the above-described embodiment, in the normal control mode, the imaging speed set in advance for reading the barcode 36 of the product 21, for example, 1/5000 second to reduce the imaging blur, for example. The CCD image sensor 17 is imaged and controlled at an appropriate shutter speed as fast as possible, the illumination device 20 is turned on, and a QR code 4 such as a coupon ticket displayed on the screen 2 of the mobile phone terminal is set in advance. Imaging control of the CCD image sensor 17 is performed at an imaging speed that is slower than the set imaging speed, for example, 1/5000 second, and the illumination device 20 is turned off.

  Thereby, when the screen 2 of the mobile phone terminal 1 is, for example, a transmissive liquid crystal display, a backlight is provided on the liquid crystal display. However, the backlight and the external light collide with each other so that the liquid crystal display screen 2 The upper QR code 4 does not become difficult to see visually. That is, for example, as shown in FIG. 6, the shadow 3 of the lighting device 20 such as an LED that is lit on the screen 2 of the mobile phone terminal 1 is not reflected at all, and the screen 2 of the mobile phone terminal 1 is at an optimum imaging speed. The data code such as QR code 4 displayed on the screen can be read. Accordingly, even the barcode 36 including the price of the product 21 or the QR code 4 such as a coupon displayed on the screen 2 of the mobile phone terminal 1 can be read stably.

When the control on the CCD image sensor 17 and the illumination device 20 in the coupon control mode is completed, the control automatically returns to the normal control mode again, so that the operation of returning the cashier to the normal control mode can be saved and the operation is facilitated. it can.
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.
In the above embodiment, the bar code 36 on the label 35 attached to the product 21 is the first notation form of the data code, and the QR code 4 displayed on the screen 2 of the mobile phone terminal is the data code. Although the second notation form is used, the present invention is not limited to this, and data codes in other display forms may be read.

  Further, the second notation form is not limited to the QR code 4, but may be a barcode 36. In this case, the QR code 4 or the barcode 36 is a gift of a rough product, a discount service for age restrictions, Information such as event ticket purchases may also be included. Furthermore, the second notation form is not limited to information displayed on the screen 2 of the mobile phone terminal, but can be applied to, for example, reading information displayed on a portable backlit liquid crystal display.

  1: Mobile phone terminal, 2: Screen of mobile phone terminal, 4: QR code, 10: Soccer table, 11: Data code reader, 12: POS terminal, 13: Keyboard, 14: Display for cashier, 15: Display for shoppers, 16: printer, 17: imaging device (CCD image sensor), 18: keyboard, 19: display, 20: lighting device, 21: merchandise, 22, 23: shopping basket, 24: local area Network (LAN), 25: POS server, 30: control unit, 31: illumination drive circuit, 32: mode switching unit, 33: interface, 34: lens, 35: label, 36: barcode, 37: decoder.

Data code reading apparatus according to the principal aspect of the present invention includes an imaging device for acquiring images data by imaging a de Takodo, an illumination unit for illuminating the data code, for capturing an image of the data code listed in items The first imaging mode and the second imaging mode for imaging the data code displayed on the screen of the mobile terminal are switched. Usually, the first imaging mode is set and the second imaging is performed manually. A mode switching unit for switching to the mode.

Data code reading method according to the principal aspect of the present invention illuminated by the illumination unit to de Takodo, acquires the image data of Lud Takodo is the lighting by imaging by the imaging device, the data code from the images data In the data code reading method for decoding the data code, the data code reading method includes a first imaging mode for reading the data code written on the product and a second imaging mode for reading the data code displayed on the screen of the portable terminal. Normally, the first imaging mode is set, and switching to the second imaging mode is performed in response to a manual switching instruction .

Claims (3)

An imaging device that captures at least a data code and acquires the image data;
A decoder for decoding the data code from the image data acquired by the imaging device;
An illumination unit that illuminates at least the data code;
Switching to the normal control mode for reading the data code printed on the label attached to the product, or the coupon control mode for reading the data code displayed on the screen of the mobile phone terminal. A mode switching unit for setting the normal control mode;
When the normal switching mode is set by the mode switching unit, the coupon control mode is configured to control the imaging of the imaging device at a preset imaging speed for reducing imaging blur and to turn on the illumination unit. When the mobile phone terminal is a transmissive liquid crystal display that is slower than the preset imaging speed and is illuminated by the backlight of the backlight provided in the liquid crystal display. The data code displayed on the screen of the mobile phone terminal while controlling the imaging of the imaging device at the imaging speed set according to the illuminance of the data code on the screen of the mobile phone terminal and controlling the illumination unit to turn off. A control unit that returns to the normal control mode again after imaging
A data code reading device comprising: The data code printed on the label includes at least price data of the product,
The data code displayed on the screen of the mobile phone terminal includes coupon data including at least a discount on the product,
The data code reader according to claim 1. In a data code reading method of illuminating at least the data code, imaging at least the illuminated data code to obtain image data, and decoding the data code from the image data,
It is switched to the normal control mode for reading the data code printed on the label attached to the product, or the coupon control mode for reading the data code displayed on the screen of the mobile phone terminal. Set to normal control mode,
When the normal control mode is set, the imaging device is imaged at an imaging speed for reducing imaging blur set in advance, the lighting unit is controlled to be turned on, and the coupon control mode is switched. When the mobile phone terminal is a transmissive liquid crystal display that is slower than a preset imaging speed, on the screen of the mobile phone terminal illuminated by the backlight of the backlight provided in the liquid crystal display After imaging the imaging device at an imaging speed set according to the illuminance of the data code and controlling the illumination unit to turn off and imaging the data code displayed on the screen of the mobile phone terminal, again , Return to the normal control mode,
A data code reading method characterized by the above.

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