JP2009140351A - Input device equipped with resistive film-based touch panel, and method of detecting touch position thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique for determining a user's actual touch position, even when a foreign material is caught in a resistive film-based touch panel. <P>SOLUTION: An input device has an input resistive film-based touch panel. Touching of the touch panel is detected, along with the touch position and a determination is made as to whether the touch has been made by a foreign material. If the touch is determined to be by a foreign material, the touch position is saved as the position of a foreign material. After a determination is made that the touch has been made by a foreign material, the touch position detected is corrected using the previously saved position of the foreign material, and the user's actual touch position is calculated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an input device including a resistive touch panel.

  In recent years, resistive touch panels have been used for operation panels of many electronic devices. Generally, a resistive film type touch panel has a film (hereinafter referred to as “resistive film”) of a transparent conductive material (for example, indium tin oxide) formed on the opposing surfaces of a film and glass. The two resistance films are usually separated by a predetermined interval, and have a structure in which they are brought into contact and energized by touching (pressing) with a finger or a pen.

  For example, as described in Patent Document 1, such a resistive film type touch panel detects a potential at a touch position on the resistive film by applying a DC voltage to both ends of the resistive film, and touched coordinates. Calculate the position.

JP-A-4-364512

  However, since an upper cover (frame) for supporting the panel surface is attached to the resistive film type touch panel, a gap is easily formed between the panel surface and the upper cover (frame). For this reason, it is often the case that foreign matter such as dust is caught in the gap.

  When the foreign object is caught, even if the user appropriately touches one point on the panel surface (on the resistance film), the user is touched at the two points of the foreign object position and the user touch position at the same time. Therefore, the conventional resistive touch panel cannot specify the actual touch position of the user.

  An object of the present invention is to provide a technique for obtaining a user's actual touch position even when a foreign object is caught in a resistive touch panel.

  An input device according to the present invention for solving the above-described problem is an input device including a resistive film type touch panel, wherein touch position detecting means for detecting a touch on the touch panel together with a touch position, and the touch is a foreign object. Foreign matter determination means for determining whether or not the touch is due to a foreign matter, if it is determined that the touch is due to a foreign matter, foreign matter position storage means for storing the touch position as a foreign matter position, and after determining that the touch is due to a foreign matter, User touch position calculation means for correcting the detected touch position using the foreign object position and calculating the actual touch position of the user.

  According to the input device of the present invention, the actual touch position of the user can be obtained even when foreign objects are caught in the resistive touch panel.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram of an in-vehicle navigation device 100 to which an embodiment of the present invention is applied. As shown in the figure, the in-vehicle navigation device 100 includes an arithmetic processing unit 1, a display 2, a storage device 3, a voice input / output device 4, an input device 5, a vehicle speed sensor 6, a gyro sensor 7, and a GPS. And a receiving device 8.

  The arithmetic processing unit 1 is a central unit that performs various processes. For example, the present location is detected based on information output from various sensors (6, 7) and the GPS receiver 8. Further, map data necessary for display is read out from the storage device 3 based on the obtained current location information. Further, the read map data is developed in a graphic form, and a mark indicating the current location is superimposed on the map data and displayed on the display 2. In addition, the map data stored in the storage device 3 is used to search for an optimum route (recommended route) that connects the starting point (current location) instructed by the user and the destination. Further, the user is guided using the voice input / output device 4 and the display 2.

  The display 2 is a unit that displays graphics information generated by the arithmetic processing unit 1. The display 2 is composed of a CRT, a liquid crystal display, or the like.

  The voice input / output device 4 includes a microphone, acquires voice spoken by the user, and transmits the voice to the arithmetic processing unit 1. Further, the message to the user generated by the arithmetic processing unit 1 is converted into an audio signal and output.

  The input device 5 is a unit that receives instructions from the user. The input device 5 includes a transparent touch panel 51 attached to the display surface of the display 2 and other hard switches (for example, a power button, a scroll key, a scale change key, etc.).

  The touch panel 51 is a resistive film type touch panel, and outputs the position on the touch panel touched by the user to the arithmetic processing unit 1. Specifically, the touch panel 51 has a configuration in which a film on which a transparent conductive material is formed and glass are arranged to face each other. The film and the glass are held in a state where they are separated from each other by a spacer, and when the user touches the touch panel, the film and the glass are brought into contact with each other at the pressed position and are energized. At this time, the touch panel 51 outputs different voltage signals to the arithmetic processing unit 1 depending on the energized position.

  The touch panel 51 configured as described above is configured to output a voltage signal indicating a position on the touch panel touched by the user (for example, a voltage signal indicating a position in the X-axis direction and a voltage signal indicating a position in the Y-axis direction), The data can be output to the arithmetic processing unit 1. However, when two points on the touch panel are touched at the same time, the touch panel 51 is configured to output to the arithmetic processing unit 1 a voltage signal indicating the position of the midpoint of the two touched points.

  The vehicle speed sensor 6, the gyro sensor 7, and the GPS receiver 8 are used for detecting the current location (own vehicle position) by the in-vehicle navigation device 100. The vehicle speed sensor 6 measures the distance from the product of the circumference of the wheel and the measured rotational speed of the wheel, and further measures the angle at which the moving body is bent from the difference in rotational speed of the paired wheel. The gyro sensor 7 is constituted by an optical fiber gyro, a vibration gyro, or the like, and detects an angle at which the moving body rotates. The GPS receiver 8 receives a signal from a GPS satellite, and measures the distance between the mobile body and the GPS satellite and the rate of change of the distance with respect to three or more satellites. Measure speed. Further, the GPS receiver 8 acquires the current time by extracting data specifying the current time from the signal received from the GPS satellite.

  The storage device 3 is composed of a storage medium such as a CD-ROM, DVD-ROM, HDD, or IC card. In this storage medium, for example, map data necessary for navigation processing, touch position specifying data 200 for specifying the position of the touch on the touch panel 51, and the like are stored.

  A schematic data structure of the touch position specifying data 200 is shown in FIG. The touch position specifying data 200 stores data for specifying the position of the touch on the touch panel 51 from the voltage signal output from the touch panel 51. As illustrated, the touch position specifying data 200 is obtained from a record 240 for each voltage signal output from the touch panel 51 (a combination of a voltage signal indicating a position in the X-axis direction and a voltage signal indicating a position in the Y-axis direction). Become. In each record 240, the touch position 230 is stored in association with the output voltage signal (X coordinate) 210 and the output voltage signal (Y coordinate) 220 output from the touch panel 51. The output voltage signal (X coordinate) 210 is data for specifying a voltage signal indicating the position in the X-axis direction output from the resistive film on the film side constituting the touch panel 51. The output voltage signal (Y coordinate) 220 is data for specifying a voltage signal indicating a position in the Y-axis direction that is output from the glass-side resistance film constituting the touch panel 51. The touch position 230 is data for specifying the position of the touch on the touch panel 51, and is, for example, a character string such as “position (**, **)” or “non-touch state”. The touch position 230 in the “non-touch state” indicates a state in which no touch on the touch panel 51 is touched.

  FIG. 3 is a functional block diagram of the arithmetic processing unit 1. As illustrated, the arithmetic processing unit 1 includes a main control unit 101, an input reception unit 102, a display processing unit 103, a touch position detection unit 104, a foreign matter determination unit 105, a correction mode switching unit 106, and a touch. A position correction unit 107.

  The main control unit 101 performs a process of controlling each unit of the arithmetic processing unit 1 in an integrated manner.

  The input receiving unit 102 receives a request from a user input to the input device 5 (touch panel 51) and analyzes the request content. The input receiving unit 102 notifies the main control unit 101 of data corresponding to the analysis result. For example, the input reception unit 102 receives a request such as a request to supply power to the in-vehicle navigation device 100 or a request to turn off the power, and notifies the main control unit 101 of the request. The input receiving unit 102 receives input data for setting various functions of the in-vehicle navigation device 100 and notifies the main control unit 101 of the input data.

  The display processing unit 103 displays a map or the like on the display 2. Specifically, the display processing unit 103 generates and notifies a drawing command to be displayed on the display 2. When the display processing unit 103 displays a map on the display 2, the display processing unit 103 extracts, from the storage device 3, map data in an area requested to be displayed (for example, an area near the current position of the vehicle-mounted navigation device 100). Then, a map drawing command is generated so as to draw marks such as roads, other map components, current positions, destinations, and arrows for recommended routes with the specified scale and drawing method. Further, the display processing unit 103 displays a mark indicating the current position of the host vehicle, various setting screens, a recommended route, and the like on the map displayed on the display 2.

  The touch position detection unit 104 detects a touched position on the touch panel 51. Specifically, the touch position detection unit 104 refers to the touch position specifying data 200 and outputs voltage signals (output voltage signal (X coordinate) 210 and output voltage signal (Y coordinate) 220) output from the touch panel 51. The touch position is detected by specifying the touch position 230 corresponding to.

  For example, if the touch position 230 corresponding to the voltage signal output from the touch panel 51 is “position (**, **)”, the touch position detection unit 104 determines that the touch panel 51 is touched. The touch position (**, **) is notified to the main control unit 101. On the other hand, if the touch position 230 corresponding to the voltage signal output from the touch panel 51 is in the “non-touch state”, the touch position detection unit 104 determines that the touch panel 51 is not touched. Notify the control unit 101.

  The foreign matter determination unit 105 determines whether the touch made on the touch panel 51 is a touch by a user or a touch due to foreign object pinching. Specifically, the foreign matter determination unit 105 determines that the touch is a touch due to foreign object pinching when the duration of the touch state at the same position exceeds a predetermined time (for example, 2 minutes). On the other hand, when the duration of the touch state at the same position is a predetermined time or less, the touch is determined as a touch by the user.

  The foreign object determination unit 105 obtains the duration of the touch state by obtaining the elapsed time from when the voltage signal detected by the touch position detection unit 104 changes until the next voltage signal changes. Can do. Further, when the foreign object determination unit 105 determines that the touch by the foreign object has been made, the touch position detected by the touch position detection unit 104 at that time is stored in the memory as the position of the foreign object (Xhold, Yhold). deep.

  The correction mode switching unit 106 corrects the detected touch position when the foreign object determination unit 105 determines that the touch made on the touch panel 51 is a touch due to the foreign object being sandwiched, and corrects the actual touch of the user. Switch to the correction mode for finding the touch position. Specifically, the correction mode switching unit 106 notifies the touch position correction unit 107 (to be described later) of an instruction to correct the user's touch position on the touch panel 51 thereafter. At the same time, the correction mode switching unit 106 causes the display processing unit 103 to display an image for the correction mode on the display 2. For example, in the correction mode, the size of icons (including buttons) displayed on the display 2 is made larger than that in the normal mode, and the interval between icons to be displayed is made longer than in the normal mode. This is because in the correction mode, since the touch position is corrected when the touch position is obtained, an error is likely to occur between the actual touch position and the obtained touch position. In the correction mode, data for notifying the user that the user is operating in the correction mode (for example, a character string such as “Operating in the correction mode!”) May be displayed on the display 2.

  In the correction mode, the touch position correction unit 107 corrects the detected touch position and specifies the actual touch position of the user. A specific correction method will be described with reference to FIG. As shown in the drawing, an upper cover (frame) 52 for supporting the touch panel 51 is attached to the display 2. Since a gap 400 is formed between the touch panel 51 and the upper cover (frame) 52, foreign matter 410 such as dust is easily caught in the gap 400. When a foreign object is caught, the touch panel 51 may be in a state where the foreign object is always touched. Thereafter, even if the touch by the user is made on the touch panel 51, the touch position (Xsense) detected by the touch position detection unit 104 is detected. , Ysense) is the midpoint position between the position (Xhold, Yhold) of the foreign object and the touch position (Xreal, Yreal) actually touched. Using this property, the touch position correction unit 107 uses the touch position (Xsense, Ysense) detected by the touch position detection unit 104 as a center point, and the position of the foreign object (Xhold, Yhold) determined by the foreign object determination unit 105. A point-symmetric position is specified as a touch position (Xreal, Yreal) actually touched by the user. More specifically, the touch position correction unit 107 obtains the touch position (Xreal, Yreal) actually touched by the user, for example, using the following calculation formulas (Formula 1 and Formula 2).

(Formula 1): Xreal = 2 · (Xsense−Xhold) + Xhold
(Formula 2): Yreal = 2 · (Ysense−Yhold) + Yhold

  The arithmetic processing unit 1 having the above functions is realized, for example, with a hardware configuration as shown in FIG.

  As shown in the figure, the arithmetic processing unit 1 has a configuration in which devices are connected by a bus 712. The arithmetic processing unit 1 includes a CPU (Central Processing Unit) 701 that executes various processes such as numerical calculation and control of each device, and a RAM (temporarily storing map data and arithmetic data read from the storage device 3). Random Access Memory) 702, ROM (Read Only Memory) 703 for storing programs and data, DMA (Direct Memory Access) 704 for executing data transfer between the memories and between the memory and each device, and graphics drawing A rendering controller 705 that performs display control and VRAM (Video Random Access Memory) 706 that stores graphic image data, a color palette 707 that converts image data into RGB signals, and analog signals that are converted into digital signals. A / D converter 708 and a serial signal synchronized with the bus 712 It has a SCI (Serial Communication Interface) 709 which converts the signal, synchronizes the parallel signals to the bus and PIO (Parallel Input / Output) 710 for mounting to the bus 712, a counter 711 for integrating a pulse signal.

  Next, a characteristic operation of the vehicle-mounted navigation device 100 configured as described above will be described. FIG. 6 is a flowchart showing the touch position specifying process performed by the arithmetic processing unit 1 of the in-vehicle navigation device 100.

  The main control unit 101 of the arithmetic processing unit 1 starts the touch position specifying process when the vehicle-mounted navigation device 100 is powered on. The power is turned on by a user operating a power button (not shown) provided in the input device 5.

  After the power is turned on, the touch position detection unit 104 detects a touch state on the touch panel 51 (step S101). Specifically, the touch position detection unit 104 refers to the touch position specifying data 200 stored in the storage device 3, and outputs a voltage signal (output voltage signal (X coordinate) 210) output from the touch panel 51. The touch position 230 corresponding to the output voltage signal (Y coordinate) 220) is specified.

  As a result of the identification, if the touch position 230 indicates that “the touch panel 51 is not touched (non-touch state)” (step S101; No), the touch position detection unit 104 repeats the process of step S101. . Here, the time interval for repeating the processing of step 101 is determined in advance (for example, several msec). On the other hand, as a result of the identification, if the touch position 230 indicates that “the touch panel 51 is touched” (step S101; Yes), the touch position detection unit 104 selects the touch position (for example, coordinates) as the main. The control unit 101 is notified, and the process proceeds to step S102.

  In step S <b> 101, every time the output voltage signal of the touch panel 51 detected by the touch position detection unit 104 is changed to a state indicating that “the touch panel 51 is touched”, the foreign matter determination unit 105 includes the CPU 701. Using the counter, the duration of the touch state is obtained.

  Subsequently, the main control unit 101 determines whether or not the touch position notified from the touch position detection unit 104 matches the position of the foreign object (step S102). Specifically, the main control unit 101 compares the foreign object detection position data 300 indicating the position of the foreign object with the touch position notified from the touch position detection unit 104, and when both positions match or substantially match. Then, it is determined that the touch position detected in step S101 matches the position of the foreign object.

  The foreign object detection position data 300 will be described later.

  Here, when it is determined that the touch position detected in step S101 matches the position of the foreign object (step S102; Yes), it is determined that the touch different from the touch due to the foreign object is not made by the user, and the main control is performed. The unit 101 returns the process to step S101. On the other hand, when it is determined that the touch position detected in step S101 and the position of the foreign object do not match (step S102; No), the main control unit 101 determines that a touch different from the touch due to the foreign object sandwiched is made by the user. Then, the process proceeds to step S103.

  In step S103, the main control unit 101 determines whether or not the setting at that time is the correction mode (step S103). Specifically, the main control unit 101 refers to data for identifying the correction mode stored in the RAM 702 and determines whether or not the correction mode is set.

  If it is determined that the correction mode is set, the main control unit 101 moves the process to step S108. On the other hand, if it is determined that the correction mode is not set (the normal mode is set), the main control unit 101 shifts the processing to step S104.

  In step S104, the foreign matter determination unit 105 determines whether the touch determined by the touch position detection unit 104 being touched on the touch panel 51 in step S101 is a touch by a user or a touch due to foreign object pinching (step S104). S104). Specifically, the foreign matter determination unit 105 determines whether or not the duration of the touch state at the same position on the touch panel 51 exceeds a predetermined time (for example, 2 minutes). When the predetermined time is exceeded (step S104; Yes), the foreign matter determination unit 105 determines that the touch is due to the foreign object being caught, and the process proceeds to step S105.

  In step S105, the foreign matter determination unit 105 stores the touch position detected by the touch position detection unit 104 in step S101 in the RAM 702 as the foreign matter position (Xhold, Yhold) (step S105). Specifically, the foreign object determination unit 105 creates the foreign object detection position data 300 in the RAM 702 and stores the touch position detected by the touch position detection unit 104 in step S101 in the foreign object detection position data 300.

  A schematic data structure of the foreign object detection position data 300 is shown in FIG. In the foreign object detection position data 300, as shown in the figure, an X coordinate (Xhold) 310 and a Y coordinate (Yhold) 320 for specifying the position of the foreign object are stored in association with each other.

  Subsequently, the correction mode switching unit 106 performs a process of switching from the normal mode to the correction mode (step S106). Specifically, the correction mode switching unit 106 notifies the touch position correction unit 107 of an instruction to correct the user's touch position that is subsequently made on the touch panel 51. At the same time, the correction mode switching unit 106 causes the display processing unit 103 to display an image for the correction mode on the display 2.

  For example, in the normal mode, it is assumed that the display processing unit 103 causes the display 2 to display a setting screen for performing “destination setting” as illustrated in FIG. At this time, the size of buttons to be displayed on the setting screen (favorite button 210, name to button 220, facility to button 230, etc.) is set to a normal size A (for example, 10 mm), and the interval between the buttons to be displayed is a normal size. The interval is B (for example, 5 mm). In step S106, when the mode is switched to the correction mode, the display processing unit 103 displays a setting screen as shown in FIG. For example, the size of the button to be displayed on the setting screen is the correction mode size A ′ (larger than size A, for example, 15 mm), and the interval between the buttons to be displayed is the correction mode interval B ′ (interval). The interval is longer than B, for example, 8 mm). In the correction mode, the display processing unit 103 causes the setting screen to display a notification column 240 for notifying the user that the user is operating in the correction mode.

  After switching to the correction mode, the main control unit 101 returns to step S101 and continues the processing.

  On the other hand, when it is determined in step S104 that the duration of the touch state at the same position is equal to or shorter than the predetermined time (step S104; No), the foreign matter determination unit 105 detects the touch detection unit 104 in step S101. It is determined that the touch is a touch by the user, and the process proceeds to step S107.

  Subsequently, the touch position detection unit 104 specifies the touch position on the touch panel 51 detected in step S101 without correction as the touch position (Xreal, Yreal) by the user (step S107). Then, the touch position (Xreal, Yreal) by the identified user is notified to the main control unit 101, and the process proceeds to step S109.

  On the other hand, in step S108 when it is determined in step S102 that the correction mode is set, the touch position correction unit 107 corrects the touch position detected in step S101 and specifies the actual user touch position (step S108). ). Specifically, the touch position correction unit 107 uses the touch position (Xsense, Ysense) detected by the touch position detection unit 104 in step S101 as the center point, and the position of the foreign object (Xhold) stored in the foreign object detection position data 300. , Yhold) is specified as the touch position (Xreal, Yreal) actually touched by the user. That is, by the process in step S108, the touch position (Xsense, Ysense) detected by the touch position detection unit 104 in step S101 can be corrected to the touch position (Xreal, Yreal) actually touched by the user.

  Subsequently, the touch position correction unit 107 notifies the main control unit 101 of the actual user touch position (Xreal, Yreal) identified in step S108.

  In step S107 or step S108, the main control unit 101 notified of the touch position (Xreal, Yreal) specifies a user request by touching the touch position (Xreal, Yreal) (step S109). Specifically, the user request corresponding to the touch position (Xreal, Yreal) is specified with reference to data indicating the correspondence relationship between the touch position and the request stored in advance in the storage device 3. The main control unit 101 executes processing in response to the specified request.

  After specifying the user request, the main control unit 101 returns to step S101 and continues the process while in the input acceptance mode by the touch panel 51.

  It should be noted that when the foreign object 410 sandwiched in the gap 400 of the display 2 is removed during the touch position specifying process, the correction mode can be canceled and the normal mode can be restored based on a user instruction. Good.

  Heretofore, an example of the embodiment of the present invention has been described. According to the above embodiment, the in-vehicle navigation device 100 of the present invention detects the position of a foreign object even when the foreign object is caught in the gap 400 between the touch panel 51 and the upper cover (frame) 51. The actual position where another touch is newly made by the user can be specified.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation and application are possible.

  For example, the present invention is not limited to the application to the vehicle-mounted navigation device 100, but can be applied to any device including a resistive film type touch panel.

  In addition, the display processing unit 103 of the present invention may display a screen for notifying the user of the position where the foreign object is sandwiched on the display 2. Specifically, the display processing unit 103 displays an image indicating the direction of the foreign object position (Xhold, Yhold) stored in the foreign object detection position data 300 in advance near the foreign object position (Xhold, Yhold) on the display 2. Display at the specified position. The user who sees this screen can easily know the position of the foreign matter, and the work of removing the foreign matter becomes easy.

1 is a schematic configuration diagram of an in-vehicle navigation device to which an embodiment of the present invention is applied. It is a figure which shows the structural example of touch position specific data. It is a figure which shows the function structure of an arithmetic processing part. It is explanatory drawing for demonstrating the method of calculating a user's actual touch position when a foreign material is pinched | interposed. It is a figure which shows the hardware constitutions of an arithmetic processing part. It is a flowchart of a touch position specific process. It is a figure which shows the structural example of a foreign material detection position data. (A) It is a screen display example of the setting screen in the normal mode. (B) It is a screen display example of the setting screen in the correction mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Operation processing part, 2 ... Display, 3 ... Memory | storage device, 4 ... Voice input / output device, 5 ... Input device, 6 ... Vehicle speed sensor, 7 ... Gyro sensor , 8 ... GPS receiver, 51 ... touch panel, 52 ... upper cover (frame), 100 ... in-vehicle navigation device, 101 ... main control unit, 102 ... input accepting unit, DESCRIPTION OF SYMBOLS 103 ... Display processing part, 104 ... Touch position detection part, 105 ... Foreign substance determination part, 106 ... Correction mode switching part, 107 ... Touch position correction part, 200 ... Touch position specification Data: 300 ... Foreign object detection position data, 400 ... Gap, 410 ... Foreign object (dust), 510 ... Favorite button, 520 ... Name button, 530 ... Facility button, 701 ... CPU, 7 2 ··· RAM

Claims (4)

An input device including a resistive film type touch panel,
Touch position detecting means for detecting a touch on the touch panel together with the touch position;
Foreign matter determining means for determining whether or not the touch is caused by a foreign matter;
When it is determined that the touch is due to a foreign object, a foreign object position storage unit that stores the touch position as a foreign object position;
When the foreign object position is stored, the touch position detected by the touch detection unit is corrected using the foreign object position, and the user touch position calculation unit calculates the actual touch position of the user;
An input device comprising: The input device according to claim 1,
The foreign matter determining means includes
When the touch position detected by the touch position detecting means does not change for a predetermined time or more, it is determined that the touch is caused by a foreign object, and when the touch position changes within a predetermined time, the touch is determined by the user. judge,
An input device characterized by that. The input device according to claim 1,
The user touch position calculation means includes:
When the foreign object position is stored, the point position symmetrical with respect to the foreign object position is set as the actual touch position of the user, with the touch position detected by the touch detection unit as a center point thereafter.
An input device characterized by that. A touch position detection method in an input device including a resistive film type touch panel,
The input device includes a control unit,
The control unit is
A touch position detection step of detecting a touch on the touch panel together with a touch position;
A foreign matter determination step for determining whether the touch is caused by a foreign matter;
A foreign object position storing step for storing the touch position as a foreign object position when it is determined that the touch is due to a foreign object;
A user touch position calculating step of correcting the touch position detected by the touch detection unit using the foreign object position and calculating the actual touch position of the user when the foreign object position is stored;
The touch position detection method characterized by performing.

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