APPARATUS TO AUTOMATICALLY CONTROL THE DIRECTIONAL LAND MAGNETIC FIELD AND METHOD FOR THE SAMEBACKGROUND OF THE INVENTIONFIELD OF THE INVENTIONThe present invention relates to a technique for controlling the terrestrial magnetic field having a close relationship with an image quality and more particularly, to an apparatus for automatically controlling the directional earth magnetic field which is capable of automatically establishing and modifying the force and the direction of a terrestrial magnetic field and its method. Especially, after the terrestrial magnetic field values are stored in a memory unit of a system controller when using an automatic memory function, when a terrestrial magnetic field value is introduced that has to be set by an operator as desired , the Earth's magnetic field data corresponding to an entered earth magnetic field value from the earth's magnetic field data stored in the memory unit are read, and when using this data, an output voltage of one unit is variably adjusted. energy supply of a terrestrial magnetic field camera so that a desired terrestrial magnetic field value is automatically set or modified.
DESCRIPTION OF THE BACKGROUND TECHNIQUEFig. 1 is a schematic block diagram of an apparatus for controlling a terrestrial magnetic field according to a conventional technique, including a gauss meter 11 installed in a terrestrial magnetic field chamber and power supply units 10A, 10B and 10C connected to the gauss meter 11 to supply the energy of the three axes X, Y and Z respectively. The operation and effect of the apparatus for controlling a terrestrial magnetic field according to the conventional technique will now be described. In the conventional terrestrial magnetic field, the operator identifies a numerical value of the gauss meter 11 and manually adjusts a voltage value of the power supply units 10A, 10B and 10C to establish a desired terrestrial magnetic field value. However, since the force and direction of the earth's magnetic field values are different in each region of the world, the values of the earth's magnetic field need to be differentially established in the manufacturing stage of a monitor according to the regions where it will be sold. the monitor. Thus, in such a conventional technique, the operator establishes a terrestrial magnetic field value by manually adjusting a voltage value of the power supply units 10A, 10B and 10C while consulting a gauss meter, which has the problem of that the time of operation takes a long time to establish and modify the value of the Earth's magnetic field and therefore its productivity is diminished.
BRIEF DESCRIPTION OF THE INVENTIONTherefore, an object of the present invention is to provide an apparatus for automatically controlling a directional earth magnetic field in which a system controller is established for which a gauss meter is connected through a communication interface and each one of the measurements of the terrestrial magnetic field values in the gauss meter is transferred from the system controller through the interface and stored in a memory unit of the system controller, thereby providing an automatic memory function , and, when through a key entry a desired terrestrial magnetic field value is introduced to be set by a user, the system controller reads the data of the terrestrial magnetic field corresponding to the value of the terrestrial magnetic field introduced from the data of terrestrial magnetic field stored in the memory unit and an output voltage of a unit of s is adjusted uministro of energy when using the data of terrestrial magnetic field, thus establishing automatically the value of terrestrial magnetic field of a terrestrial magnetic camera.
To achieve this and other advantages and in accordance with the purposes of the present invention, as incorporated herein and widely described, an apparatus is provided for controlling a directional earth magnetic field that includes a power supply unit 10 for applying a voltage to a coil of a terrestrial magnetic field camera 50 to generate a terrestrial magnetic field; a system controller 20 for variably controlling the voltage applied to the coil of the terrestrial magnetic field camera 50 from the power supply unit 10 to automatically set a terrestrial magnetic field value; a key input unit 30 for entering input information or a command, such as the selection of an address and the terrestrial magnetic field direction from a user to the system controller 20 and a screen display unit 40 for displaying a set of terrestrial magnetic field values by system controller 20. In order to achieve the above objectives, a method is provided to automatically control the directional earth magnetic field that includes the steps of: placing a gauss meter in the place where wants to measure a terrestrial magnetic field and execute an automatic memory function to receive a terrestrial magnetic field value measured by the gauss meter through a communication interface; give an address to each value of the earth's magnetic field as it is transferred and stored in the memory unit; read the corresponding earth magnetic field data from the memory unit when the operator enters a desired terrestrial magnetic value to be established; variably controlling an output voltage of a power supply unit by using the earth's magnetic field data as it is read to automatically establish a desired terrestrial magnetic field value. The value of the Earth's magnetic field that has a close relationship to the image quality of a monitor is different in its strength and direction in each region of the world. Thus, the value of the earth's magnetic field is set appropriately for each region in order to adjust a state of the monitor's screen, when the monitor is manufactured. Consequently, due to the different terrestrial magnetic field values according to the regions, in the present invention the terrestrial magnetic field value for the regional environment is modified appropriately when a production model of the monitor is modified, for which it is provided an automatic memory function to automatically establish the strength and direction of the Earth's magnetic field of a terrestrial magnetic field camera that generates a terrestrial magnetic field of a specific region.
BRIEF DESCRIPTION OF THE DRAWINGSThe accompanying drawings, which are included to help the invention be better understood and incorporated therein and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. In the drawings: Figure 1 is a schematic block diagram of an apparatus for controlling a terrestrial magnetic field according to the conventional technique; Figure 2 is a schematic view of an apparatus for controlling a directional magnetic field in accordance with the present invention; Figure 3 is a flow chart of an automatic memory process of Figure 2 according to the present invention; Fig. 4 is a flowchart of a process for automatically controlling a directional earth magnetic field by using the automatic memory function of Fig. 2 according to the present invention; Figure 5 shows an expanded menu of figure 4 according to the present invention; and Figure 6 is a flow diagram of a process for executing a memory in the three axes X, Y and Z of Figure 3 according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED MODALITIESReference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Now with reference to Fig. 2, the operation of an apparatus for controlling a directional earth magnetic field according to the present invention will be described. Figure 2 is a schematic view of an apparatus for controlling a directional earth magnetic field in accordance with the present invention. The power supply unit 10 applies a voltage to a coil of the terrestrial magnetic field camera 50 to generate a terrestrial magnetic field. The system controller 20 receives the value of the terrestrial magnetic field measured by the three-axis gauss meter 11 of the terrestrial magnetic field camera 50 through the communication interface 12, stores it in the internal memory and controls in a variable manner a voltage applied to the coil of the terrestrial magnetic field camera 50 from the power supply unit 10 to thereby automatically establish a terrestrial magnetic field value. With the key entry unit 30, input information or a user command such as the selection of an address and the direction of the earth magnetic field to the system controller 20 is entered. In the screen display unit 40 it is displayed. a set of terrestrial magnetic field values by the system controller 20. Figure 3 is a flowchart of the automatic memory process of Figure 2 according to the present invention. First, after the X, Y and Z regions are established in the Earth's magnetic field chamber, the three-axis gauss meter placed in a predetermined predetermined space is to be measured in step S1. Then, the system controller 20 determines whether or not there is a memory scan in step S2. After such a judgment, if there is no memory scan, the system controller leaves it, whereas, if there is a memory scan, the system controller 20 stores the values of X, Y, 0 in the memory in the memory. step S4 and then memorize the values of 0, Y, Z in step S5. After this, the system controller 20 finally updates the memory in step S6. In the above processes, as the system controller 20 is connected to the gauss meter 1 1 via the communication interface 12, when the automatic memory function is carried out, the system controller 20 receives the magnetic field value terrestrial measured by gauss meter 11 through the communication interface and stored in the memory unit included in its interior so that the value of the earth's magnetic field is read by units of 0.1 G for each axis of the camera of terrestrial magnetic field in the range of -0.6G- + 0.6G and the memory frames of (X, Y, 0) and (0, Y, Z) are formed. In this regard, the reason for forming the two memory tables of (X, Y, 0) and (0, Y, Z) when establishing the automatic memory function is that if the memory is elaborated in 13 stages in the three axes of (X, Y, Z), 2197 pairs of memory frames are made, which make it disadvantageously use too much time to establish an automatic memory. Therefore, on the basis that the earth magnetic field Z (horizontal direction) is always "0" and when forming the two memory boxes (X, Y, 0) and (0, Y, Z) that take respectively the terrestrial magnetic field X (vertical direction) and the terrestrial magnetic field Z (horizontal direction) to change the earth's magnetic field, the direction of the earth's magnetic field is changeable by referring to a corresponding memory box at each moment when the direction of the magnetic field terrestrial is rotated by 90 ° and at the same time, the time taken by the automatic memory is reduced. Therefore, the system controller 20 stores the value of the earth's magnetic field as it is transferred by giving an address to the two memory frames.
Fig. 4 is a flowchart of a process for automatically controlling a directional earth magnetic field by using the automatic memory function of Fig. 2 according to the present invention. First, a desired terrestrial magnetic field value to be set by the operator is entered through the key operation of the key input unit 30 in step S1. Then, a menu is displayed to select the terrestrial magnetic field data in the screen display unit 40 in step S2. The system controller 20 of FIG. 2 determines that an address was selected in step 3. If the address was not selected in step S3, the system controller 20 again determines whether a basic terrestrial magnetic field value was extracted in Step S4. If the basic terrestrial magnetic field value was extracted, one returns to step S1, whereas if the basic terrestrial magnetic field value was not extracted, an error signal sound is generated and an error is displayed in step S8. In step S3, if the address was selected, an address memory is checked to differentiate whether there is a terrestrial magnetic field value corresponding to the address in step S5. After checking the address memory in step S5, if there are no corresponding earth magnetic field value data, step S8 is carried out, whereas if there are data of the corresponding earth magnetic field value, the data is re-verified. data memory to differentiate whether there is a power supply that fits the data in the power supply unit 10 in step S6. If there is no data to adjust the power supply in step S6, step S8 is carried out, whereas if there is data that adjust the power supply, the data that adjust the power supply are read in the memory box. corresponding in step S7 and an output value of the power supply unit 10 is converted in step S9. Figure 5 shows a deployment menu of Figure 4 according to the present invention. The "Auto Memory (AUTO MEM)" is for the process of the automatic memory of the terrestrial magnetic field shown in Figure 3 according to the selection of the operator. The "Address Memory (ADD MEM)" is to enter the desired terrestrial magnetic field value to be displayed by the operator on the axes of (X, Y, Z). "I NT / EXT" is to determine if the system is operated by INT (keyboard) or by EXT (key box). "SELF TEST" is for self-checking a part of the system's hardware. "Address (ADD)" is for selecting the address in step S3. Figure 6 is a flow chart of a process for executing a memory in the three axes of X, Y and Z of Figure 3 according to the present invention. First, the values of X1, Y1 and Z1, that is, the target values of the three-axis terrestrial magnetic field, are established in step S1. The target value X1 is compared to a gauss value x extracted from the X axis of the current power supply unit in step S2. If the value x is greater than the value X1, the value x is reduced in step S3, while if the value x is less than the value X1, the value x is increased in step S4. In case the value x is the same as the value X1, it is continued to the next stage. Similarly, the target value Y1 is compared to a gauss value extracted from the Y axis of the current power supply unit in step S5. If the value y is greater than the value Y1, the value y is reduced in step S6, whereas, if the value y is less than the value Y1, the value y is increased in step S7. In case the value y is the same as the value Y1, it is continued to the next stage. In the same way, the target value Z1 is compared with a z value of gauss extracted from the Z axis of the current power supply unit in step S8. If the value z is greater than the value Z1, the value z is reduced in step S9, whereas, if the value z is less than the value Z1, the value z is increased in step S10. In case the value z is the same as the value Z1, it is continued to step S2. Tables 1 and 2 show the tables of the automatic memory as processed according to the present invention.
TABLE 1 Voltage and current output values of power supply units of each axis after automatically storing each value of the Earth's magnetic field of the X and Y axesTABLE 2 Voltage and current output values of power supply units of each axis after automatically memorizing each terrestrial magnetic field value of the Y and Z axesTable 1 shows the voltage and current output values of the power supply units of each axis after automatically memorizing each terrestrial magnetic field value of the X and Y axes by taking the Z axis at "0" and the table 2 shows the voltage and current output values of the power supply units of each axis after automatically memorizing each terrestrial magnetic field value of the Y and Z axes by taking the X axis to "0". In this aspect, the range of the value of the earth's magnetic field of each axis is -0.6G- + 0.6G and the maximum voltage value of the power supply unit is 50V and the current maximum value is 5A. For a detailed explanation, the operator may enter a desired terrestrial magnetic field value to be established by operating the keys of the key input unit 30 or may select a desired direction of the desired magnetic field data from the displayed menu on the screen, according to which the system controller 20 reads the terrestrial magnetic field value data corresponding to the selected address, thereby controlling the output voltage of the power supply unit 10 when using the magnetic field data land. Under the control of the system controller 20, the power supply unit 10 applies a voltage of a predetermined level to the coil of the earth's magnetic field chamber, in such a way that the value of the earth's magnetic field desired by the operator is established. automatically. Here, the operator simply operates a UP / DOWN key or a SHIFT key provided in the key input unit 30, so he or she adjusts the value of the earth's magnetic field or the The direction of the terrestrial magnetic field displayed in the screen display unit 40 is detailed in each direction to easily consider by this how the image quality of the monitor affects the value of the terrestrial magnetic field and the change of direction of the earth's magnetic field. At the same time, the screen display unit 40 displays the value of the terrestrial magnetic field as established under the control of the system controller on the screen. The screen display unit 40 is made from a bifacial panel to display the set of terrestrial magnetic field values on both sides thereof, so that the operator's part can easily identify if the value of the earth's magnetic field was changed and This way avoid a modification of the value of the Earth's magnetic field due to inadvertence of the operator. Meanwhile, in a state in which a menu is displayed to select a terrestrial magnetic field data in the screen display unit 40, in case an address of the desired terrestrial magnetic field value to be set by the user is not entered or if the terrestrial magnetic field data selected by the user does not exist, the system controller 20 generates a warning sound and displays an error message in the screen display unit 40. At this time the user establishes a terrestrial magnetic field value and a terrestrial magnetic field direction when operating the key. That is, when the user enters a desired terrestrial magnetic field value to be established upon entering the key, the system controller 20 reads the terrestrial magnetic field data corresponding to the value of the earth's magnetic field input from the memory unit. and controls a voltage produced from the power supply unit 10 when using the data of the earth's magnetic field, thus establishing a terrestrial magnetic field value as desired by the user. As far as described, in the apparatus and method for automatically controlling the directional magnetic field of the present invention, after the terrestrial magnetic field values are stored in the memory unit of the system controller, when using the memory function automatic, when the value of the earth's magnetic field to be established as desired by the operator is entered, the earth's magnetic field data corresponding to the value of the Earth's magnetic field entered from the earth's magnetic field data stored in the the memory unit and when using this data, the output voltage of the power supply unit of the earth magnetic field camera is adjusted in order to be set or automatically modified to the desired terrestrial magnetic field value. Although the present invention can be modalized in various ways without departing from the spirit or essential characteristics thereof, it should also be understood that the modalities described above are not limited by any of the details of the foregoing description, unless otherwise specified, rather they should be broadly interpreted within the spirit and scope as defined in the appended claims and therefore all changes and modifications that fall within the scope and limits of the claims or the equivalence of such scopes and limits are intended to be as long as they are covered by the claimsannexes.