JP2007167411A - Digital display system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a digital display system which enables the accurate display of the manipulated variable of an object to be operated such as an X-ray tube. <P>SOLUTION: When the angle of rotation is adjusted so that the actual angle of rotation of a rotary platform 4 as detected with a rotary encoder 16 is displayed on the digital display device 19 in a range of the tolerance of the actual display value with displayable effective digits, information on the direction and degree of deviation of the rotary platform 4 is determined by the arithmetic processing with an arithmetic processing part 18. A display control part 21 controls to switch the display modes to be shown on the digital display device 19 so as to make the contents of the information easily understandable for operators. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a digital display device, and more particularly to a technique for continuously and accurately displaying a movement distance, an angle, and the like, which are operation amounts of an operation target.

Conventionally, as this type of digital display device, one used in a radiation therapy planning simulator system or the like is known. For example, the X-ray irradiating means and the X-ray image receiving means of the X-ray simulator are placed opposite to each other with the subject interposed therebetween, and both means are relatively driven to rotate around the body axis of the subject so that the treatment site of the subject is placed. The angle for irradiating X-rays is determined. When determining the X-ray irradiation angle, the rotation angle of the X-ray irradiation means is sequentially detected to output a pulse signal, and the actual rotation angle is calculated from the count value of the pulse signal. Then, on the digital display section provided on the operation panel or the like, the actual rotation angle is displayed by rounding down, rounding up, or rounding off the value less than the effective number of digits so as to be within the display effective number of digits (for example, patent document) 1).
JP-A-10-43320

However, the conventional example having such a configuration has the following problems.
That is, in the conventional apparatus, the actual rotation angle displayed on the digital display unit is realized by arithmetic processing such as rounding down, rounding up, and rounding off a value less than the floating point less than the effective number of digits.

  Since the rotation angle for display obtained by these arithmetic processes cannot determine the magnitude relationship with the actual rotation angle and the magnitude (deviation amount) of the deviation, there is a problem that the reliability of display accuracy is low. Particularly, a radiation treatment planning simulator or the like needs to acquire data by accurately irradiating a treatment site with an X-ray from an arbitrary angle, but the conventional apparatus has a problem that the irradiation angle includes a large error.

  The present invention has been made in view of such circumstances, and a main object of the present invention is to provide a digital display device capable of accurately adjusting the operation amount of the operation target.

In order to achieve such an object, the present invention has the following configuration.
In other words, according to a first aspect of the present invention, in the digital display device that displays the operation amount of the operation target, the detection unit that detects the actual operation amount when the operation target is operated, and the actual operation amount with a predetermined number of digits A digital display unit for displaying the value, and an arithmetic operation for determining a value closest to the actual manipulated variable as the actual manipulated variable with the number of effective digits that can be displayed on the digital display unit, and obtaining a deviation between the actual displayed value and the actual manipulated variable And an arbitrary tolerance determined so as to allow and display the actual operation amount as an actual display value in the digital display unit, and the deviation obtained by the calculation means, and the magnitude relationship between the two values And a display control unit for switching and controlling a display mode of the digital display unit according to a comparison result of the comparison unit.

  [Operation / Effect] According to this configuration, the computing means determines a value closest to the actual operation amount by the effective number of digits that can be displayed on the digital display unit, and obtains a deviation between the actual operation amount and the actual display value. At this time, it is possible to know whether the actual operation amount is a large value or a small value with respect to the actual display value. Further, the comparison means obtains a predetermined tolerance and magnitude relationship using the deviation obtained from the actual display value and the actual operation amount by the computing means. At this time, the amount of deviation of the actual operation amount from the actual display value can be known. The display control means switches and controls the display mode of the digital display unit according to these obtained conditions. That is, the operator can know the adjustment direction of the operation target and the operation amount while watching the change in the display mode displayed on the digital display unit, and can accurately adjust the operation amount of the operation target. .

  Furthermore, even if the setting of the tolerance of the actual display value is arbitrarily changed, the operation amount can be adjusted so that the operation target is within the tolerance range.

  In a second aspect based on the first aspect, the calculation means obtains two display values when a value less than the number of effective display digits included in the value of the actual operation amount is rounded down and rounded up, and the display control The means alternately switches and displays the two display values obtained by the computing means on the digital display section when the deviation becomes larger than the tolerance by the comparison of the comparing means in the process of operating the operation target. It is configured as described above.

  [Operation / Effect] According to this configuration, two display values when the value less than the effective display digit included in the actual manipulated variable value is rounded down and rounded up are displayed on the digital display unit according to the deviation obtained by the calculation means. They are displayed alternately. Therefore, the operator can easily know from the two display values displayed on the digital display section whether the actual operation amount is larger or smaller than the actual display value. In other words, this second invention can suitably implement the first invention.

  According to a third invention, in the second invention, the display control means further obtains the calculation means according to the magnitude of the deviation when the deviation is larger than a tolerance by comparison of the comparison means. The display switching speed of the two display values is changed.

  [Operation / Effect] According to this configuration, the display switching speed of the two display values can be changed according to the magnitude of the deviation. That is, since the magnitude of the deviation varies depending on the operation direction of the operation target, the operator can easily know the amount to be operated of the operation target simply by looking at the display on the digital display unit.

  According to a fourth aspect of the present invention, in the first to third aspects, the display control unit further includes a case where the deviation becomes a value smaller than a tolerance due to the comparison of the comparison unit in a process in which the operation target is operated. The actual display value is configured to be continuously displayed on the digital display unit.

  [Operation / Effect] According to this configuration, when the deviation is smaller than the tolerance, the actual display value is continuously displayed on the digital display unit, so that the operator has the operation target within the range of the actual display value. You can easily know that.

  The present specification also discloses an invention relating to the following X-ray simulator.

  (1) An X-ray simulator that acquires X-ray fluoroscopic image data for aiming collation used for aiming of radiation irradiated to a subject at the time of radiation therapy in advance before performing treatment, and is placed on a top board An X-ray tube for irradiating the subject with X-rays and an X-ray fluoroscopic image detector for detecting an X-ray fluoroscopic image of the subject generated by X-ray irradiation are arranged opposite to each other with the subject interposed therebetween, and the X-ray tube and the X-ray An image for displaying an X-ray fluoroscopic image based on the X-ray detection data output from the X-ray fluoroscopic image detector in association with the X-ray irradiation and the rotation driving means for relatively rotating the fluoroscopic image detector around the subject. Display means, detection means for detecting the actual rotation angle of the X-ray tube and the X-ray transmission image detector, a digital display section for displaying the actual rotation angle with a predetermined number of digits, and display of the digital display section The value that is closest to the actual rotation angle with an effective number of significant digits is the actual display value. Calculating means for obtaining a deviation between the actual display value and the actual rotation angle; and an arbitrary tolerance determined in advance so as to allow and display the actual rotation angle as an actual display value in the digital display unit; A comparison means for comparing the deviations obtained by the calculation means to obtain a magnitude relationship between the two values, and a display control means for switching and controlling the display mode of the digital display unit according to the comparison result of the comparison means. An X-ray simulator characterized by comprising.

  According to the invention described in (1), the computing means determines a value closest to the actual rotation angle by the number of effective digits that can be displayed on the digital display unit, and obtains a deviation between the actual rotation angle and the actual display value. . At this time, it is possible to know whether the actual rotation angle is a large value or a small value with respect to the actual display value. Further, the comparison means obtains a predetermined tolerance and a magnitude relation between the deviation using the deviation obtained from the actual display value and the actual rotation angle by the computing means. At this time, the amount of deviation of the actual rotation angle with respect to the actual display value can be known. The display control means switches and controls the display mode of the digital display unit according to these obtained conditions. That is, the operator can know the adjustment direction of the operation direction and the operation amount of the X-ray tube and the X-ray transmission image detector while watching the change of the display mode displayed on the digital display unit. The operation amount of the line transmission image detector can be adjusted with high accuracy.

  Furthermore, even if the tolerance setting of the actual display value is arbitrarily changed, the operation amount can be adjusted so that the X-ray tube and the X-ray transmission image detector are within the tolerance range.

  (2) In the X-ray simulator according to (1), the calculation unit obtains two display values when a value less than the display effective digits included in the value of the actual rotation angle is rounded down and rounded up, The display control means has two display values obtained by the computing means when the deviation becomes larger than a tolerance by comparison of the comparison means in the process of rotationally driving the X-ray tube and the X-ray transmission image detector. An X-ray simulator configured to alternately switch and display on the digital display unit.

  According to the invention described in (2) above, two display values when a value less than the effective display digit number included in the value of the actual rotation angle is rounded down and rounded up are digitally displayed according to the deviation obtained by the calculation means. Alternately displayed on the screen. Therefore, the operator can easily know from the two display values displayed on the digital display section whether the actual rotation angle is a larger value or a smaller value than the actual display value.

  (3) In the X-ray simulator according to (2), the display control means further calculates the calculation according to the magnitude of the deviation when the deviation is larger than a tolerance by comparison of the comparison means. An X-ray simulator configured to change the display switching speed of two display values obtained by means.

  According to the invention described in (3) above, the display switching speed of the two display values is changed according to the magnitude of the deviation. That is, since the magnitude of the deviation varies depending on the operation direction of the X-ray tube and the X-ray transmission image detector, the operator should operate the X-ray tube and the X-ray transmission image detector only by looking at the display on the digital display unit. You can easily know the amount.

  (4) In the X-ray simulator according to any one of (1) to (3), the display control means further performs the comparison in a process in which the X-ray tube and the X-ray transmission image detector are rotationally driven. An X-ray simulator configured to continuously display an actual display value on the digital display unit when the deviation becomes a value smaller than the tolerance by comparison of means.

  According to the invention described in (4) above, when the deviation is smaller than the tolerance, the actual display value is continuously displayed on the digital display unit, so that the operator can set the X-ray tube and X in the range of the actual display value. It can be easily known that the line transmission image detector is accommodated.

  According to the digital display device of the present invention, when the actual display value is determined by the calculation means, the magnitude relationship of the actual operation amount of the operation target can be obtained with respect to the actual display value. Further, a deviation amount of the actual operation amount with respect to the actual display value can be obtained by comparing a deviation obtained from the actual display value and the actual operation amount with a predetermined tolerance of the actual display value. That is, by switching and controlling the display mode of the digital display unit according to these obtained conditions by the control means, the operator can change the operation direction of the operation target or the like while watching the change of the display mode displayed on the digital display unit. The adjustment amount of the operation amount can be known, and the operation amount of the operation target can be adjusted with high accuracy.

  Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a case where the digital display device of the present invention is provided in an X-ray simulator for determining a treatment plan used for a radiotherapy device will be described as an example.

  FIG. 1 is a block diagram showing the overall configuration of the X-ray simulator according to the embodiment, and FIG. 2 is a front view showing the configuration around the gantry of the X-ray simulator of the embodiment.

  The X-ray simulator includes a top plate 1 provided on a bed on which a subject M as a patient is placed, and an X-ray tube that irradiates the subject M placed on the top plate 1 with X-rays. 2 and a two-dimensional array type flat panel X-ray detector 3 (hereinafter, simply referred to as “X-ray detector 3”) in which a plurality of X-ray detection elements are arranged vertically and horizontally. In addition, the X-ray tube 2 and the X-ray detector 3 are disposed opposite to each other with the subject M on the top plate 1 interposed therebetween. The X-ray detector corresponds to the X-ray fluoroscopic image detector of the present invention.

  As shown in FIG. 1, the X-ray tube 2 and the X-ray detector 3 are supported by support arms 5 a and 5 b that are cantilevered in a horizontal direction from a rotating gantry 4 arranged in a standing posture on a ring-type gantry G. They are respectively attached via guide arms 6a and 6b. The rotating gantry 4 disposed in the gantry G is configured to be rotatable as a whole with a horizontal axis Z as a rotation center. In addition, the rotary mount 4 provided with the X-ray tube 2 and the X-ray detector 3 is equivalent to the measuring object of this invention.

  In addition, as shown in FIG. 2, the X-ray tube 2 and the X-ray detector 3 are kept facing each other as the rotating mount 4 rotates in the directions indicated by the arrows RA and RB. It is configured to rotate around. Furthermore, the X-ray tube 2 and the X-ray detector 3 are configured to be reciprocally movable in the longitudinal direction of the guide arms 6a and 6b (directions indicated by arrows RC and RD) for image magnification adjustment and the like, respectively.

  The X-ray simulator according to the present embodiment includes a data collection unit 7 that collects X-ray detection data output from the X-ray detector 3 and an A / D conversion unit 8 at the subsequent stage of the X-ray detector 3. And a memory 9 for storing the converted X-ray detection data as an image signal. The data stored in the memory 9 is read out in a timely manner, and after necessary image data processing is performed by the data processing unit 10, it is displayed on the screen of the display monitor MA as an X-ray fluoroscopic image or a film (not shown). The recording unit is configured to be printed on a film and recorded as a film photograph, or stored in a disk memory and recorded in the form of an image signal.

  The film photograph created by the film recording unit is equivalent to a film photograph taken using a conventional film cassette. Hereinafter, the main components of the X-ray simulator of the embodiment will be described more specifically.

  The top plate 1 is configured to be moved back and forth or up and down by the control of the top plate drive unit 12 with the subject M mounted thereon. The top board drive unit 12 controls the driving of the top board 1 in accordance with a command signal sent from the imaging control unit 13 in response to an operation input from the operation unit 11 constituted by a keyboard, a mouse, and the like.

  The X-ray tube 2 is configured to irradiate the subject M with X-rays according to the set irradiation conditions under the control of the irradiation control unit 14 including a high voltage generator. Control by the irradiation control unit 14 is also performed in accordance with a command signal sent from the imaging control unit 13 by an operation input from the operation unit 11.

  In addition, as the X-ray tube 2 and the X-ray detector 3 move in conjunction with the rotation drive of the rotary mount 4 according to the control of the rotation drive unit 15, the rotation angle of the X-ray tube 2 that is the imaging direction. A data signal indicating (amount of operation) is sequentially detected by the rotary encoder 16 provided in the rotating gantry 4, and a pulse of a digital signal is transmitted to the subsequent pulse count unit 17 at every fixed rotation angle. . The constant rotation angle is, for example, 0.036 °, and 1000 pulses of a digital signal is transmitted from the rotary encoder 16 to the pulse counting unit 17 when the rotating mount 4 rotates once. The rotation drive unit 15 corresponds to the rotation drive unit of the present invention, and the rotary encoder 16 and the pulse count unit 17 correspond to the detection unit of the present invention.

  That is, as shown in FIGS. 2 and 3, the X-ray tube 2 and the X-ray detector 3 are rotated to move the subject M from different directions while changing the X-ray irradiation angle with respect to the subject M. It is configured to be able to shoot. The movement of the X-ray tube 2 and the X-ray detector 3 is also controlled according to a command signal sent from the imaging control unit 13.

  The pulse count unit 17 counts the pulses from the rotary encoder 16 and converts them into actual rotation angles. The actual rotation angle after conversion is transmitted to the arithmetic processing unit 18, subjected to predetermined processing by the arithmetic processing unit 18, and a three-digit numerical value provided at the upper left corner of the gantry G shown in FIG. 2 can be displayed. The digital display 19 is configured to sequentially display the rotation angle. The specific configuration and processing of the arithmetic processing unit 18 will be described later. The arithmetic processing unit 18 corresponds to the arithmetic means of the present invention, and the digital display 19 corresponds to the digital display unit.

  As the X-ray detector 3, for example, there is a normal matrix configuration in which X-ray detection elements are 1024 in the horizontal direction and 1024 in the vertical direction. The X-ray detector 3 includes an X-ray conversion layer that converts incident X-rays into electric charges or light, and elements that detect electric charges or light generated in the X-ray conversion layers are arranged in a matrix form vertically and horizontally. A direct conversion type or an indirect conversion type that is a laminated structure with the detection array layer is used.

  Further, around the gantry G of the X-ray simulator of the present embodiment, three reference points are provided so that the position setting of the subject M in the X-ray simulator and the position setting of the subject M in the radiation irradiation apparatus can be accurately matched. A plotting positioning projector (not shown) is provided, and three cross lines are projected on the body surface of the subject M by the light of the projector. Each intersection of the three cross lines becomes a reference point.

  Next, processing for displaying a rotation angle on the digital display when X-ray imaging is performed by the X-ray simulator of the above embodiment will be described based on a flowchart shown in FIG.

  [Step S <b> 1] A condition is set by operating the operation unit 11 when the subject M is placed on the top 1 to perform radiation therapy. For example, the imaging control unit 13 includes the intensity of the radiation irradiated to the subject M, the irradiation position and irradiation angle, and the tolerance for allowing the actual rotation angle as the actual display value with the effective number of digits of the digital display 19 to be fixedly displayed. To set. In this embodiment, the vertical position of the X-ray tube 2 and the X-ray detector 3 shown in FIG. 2 is set to a reference angle of 0 °, and the irradiation angle of the X-ray tube 2 is set to 45 ° as shown in FIG. The case where is set to ± 0.1 ° will be described.

  When the condition setting is completed, the subject M is placed on the top 1 and then the top 1 is moved toward the gantry G to set the subject M at the imaging position. Shooting is started by an input operation of the operation unit 11 of the keyboard or mouse.

  [Step S2] The rotation drive 15 rotates the rotating gantry 4 based on a command from the imaging control unit 13, and rotates the X-ray tube 3 so that the position of the X-ray tube 3 is 45 ° as shown in FIG. . At this time, the rotation angle of the rotary mount 4 is sequentially detected by the rotary encoder 16, and a pulse signal is transmitted to the pulse count unit 17.

  The pulse count unit 17 counts the input pulses, converts the counted value into an actual rotation angle, and transmits it to the arithmetic processing unit 18. When the actual rotation angle is in the range of 44 to 45 °, for example, when stopped at 44.75 °, the arithmetic processing unit 18 performs the following processing.

  [Step S <b> 3] First, the arithmetic processing unit 18 refers to a value less than the effective digit number of the actual rotational speed, and determines a value closest to 45 ° or 44 ° that can be displayed on the digital display 19. In this case, since the actual rotation angle is close to 45 °, 45 ° is determined as the actual display value.

  [Step S4] When the actual display value is determined, the arithmetic processing unit 18 obtains a deviation or an absolute value of the deviation based on the difference between the actual display value and the actual rotational speed. That is, the deviation of this embodiment is 45.00−44.75 = 0.25.

  [Step S5] The comparison processing unit 20 provided in the arithmetic processing unit 18 has a magnitude relationship between a tolerance (± 0.1) arbitrarily determined in advance and a deviation (0.25) obtained by the arithmetic processing unit 18. Make a comparison. Since the deviation is larger than the tolerance as a result of the comparison, a sign signal indicating that the deviation is a large value is transmitted to the display control unit 21. In addition, a numerical information signal of 44 ° which is a value obtained by rounding down the value below the floating point of the actual rotation angle and 45 ° which is a value obtained by rounding up the value is simultaneously transmitted to the display control unit 21.

  [Step S6] The display control unit 21 switches and controls the display mode of the numerical value displayed on the digital display 19 in accordance with the code signal and the numerical information signal. For example, since the deviation is larger than the tolerance and less than 45 °, the display control unit 21 alternately displays the values of the rotation angles 44 and 45 included in the numerical information signal.

  [Step S7] The operator who sees the values alternately displayed on the digital display 19 knows that the position of the X-ray tube 2 is in the range of 44 to 45 ° just before the set value of 45 °. That is, the direction of the positional deviation of the X-ray tube 2 can be known. Therefore, the operator operates and moves the operation unit 11 so that the position of the X-ray tube 2 approaches 45 °. Even during this operation, the processes in steps S2 to S6 are repeated.

[Step S8]
When the deviation becomes a value equal to or smaller than the tolerance by the operation of the operator, the arithmetic processing unit 18 determines that the actual display value matches the set value, and sends a command signal to the display control unit 21 to fix and display the value 45 on the digital display 19. Send. Based on the command signal from the arithmetic processing unit 18, the digital display 19 displays a value of 45. At the same time, the arithmetic processing unit 18 also transmits a signal indicating that the angle has reached 45 ° to the imaging control unit 13.

  [Step S <b> 9] When the imaging position is determined, the display control unit 21 causes the digital display 19 to display a value of 45 fixedly. Further, the imaging control unit 13 irradiates the subject M with X-rays from the X-ray tube 2 and stores the data output from the X-ray detector 3 in the memory 9. Further, necessary data processing is performed by the data processing unit 10, and an X-ray fluoroscopic image is displayed on the screen of the display monitor MA simultaneously with the X-ray irradiation.

  The operator moves the subject M by operating the top board 1 with the operation unit 11 and examines the X-ray fluoroscopic image displayed on the display monitor MA, and if the plan is determined, the irradiation area is determined according to the determination. An X-ray fluoroscopic image including a mark indicating that is acquired.

  The X-ray fluoroscopic image with the mark indicating the irradiation area is stored by burning necessary incidental data such as the X-ray irradiation angle for aiming collation onto the film as the content of the still image treatment plan or storing it in a disk memory or the like. . Thus, a series of processing ends.

  As described above, the actual display value determined by the arithmetic processing unit 18, the deviation between the actual rotation angle and the actual display value, and the magnitude relationship between the deviation and the tolerance are obtained, so that the position of the X-ray tube 2 is 44 to 44. Either the 45 ° range is deviated in the direction, and further, the amount of deviation from the tolerance of the set value can be obtained. Based on the results obtained by these arithmetic processing units 18, the display control unit 21 causes the digital display 19 to alternately display the values 44 and 45, so that the operator can position the X-ray tube 2 less than 45 °. It is possible to easily know the deviation direction of whether the angle is greater than 45 °. When the operator moves and adjusts the X-ray tube 3 in the opposite direction to fall within the set range, the set value is fixedly displayed, so that it can be easily known that the alignment has been completed.

  Furthermore, since the tolerance of the actual display value can be set arbitrarily, even if the tolerance is reduced, the tolerance can be easily aligned within the tolerance range. That is, the setting accuracy of the irradiation angle of the X-ray tube 2 can be improved.

  The present invention is not limited to the above-described embodiment, and can be modified as follows.

  (1) In the above-described embodiment, the display mode of the digital display 19 is switched based on a preset rotation angle. However, the same processing may be performed in units of 1 ° of the minimum display digit number.

  (2) In the above-described embodiment, the display control unit 21 alternately displays the two values based on the result of the comparison between the deviation and the tolerance in the comparison processing unit 20. You may comprise. For example, when the amount of deviation obtained from the difference between the tolerance and the deviation is large, the speed at which the two values are alternately displayed is reduced, and the display switching speed is increased as the amount of deviation is reduced, or the amount of deviation is reduced. The display value of the two values may be alternately switched so that the display time of the approaching value is lengthened and the display time of the value at which the shift amount is increased is shortened.

   (3) In the above-described embodiment, the digital display 19 is provided in the gantry G. However, the digital display 19 may be provided in the display monitor MA or another independent location.

  (4) The digital display device of the present invention can be applied not only to an X-ray simulator but also to an apparatus for measuring a moving distance or a physical quantity.

It is a block diagram which shows the whole structure of the X-ray simulator which concerns on an Example. It is a front view which shows the structure around a gantry It is a figure which shows operation | movement of an X-ray simulator. It is a flowchart which shows the process in the X-ray simulator of an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Top plate 2 ... X-ray tube 3 ... X-ray detector 4 ... Rotary mount 15 ... Rotation drive part 16 ... Rotary encoder 17 ... Pulse count part 18 ... Arithmetic processing part 19 ... Digital display 20 ... Comparison processing part 21 ... Display control unit M ... Subject

Claims (4)

  In a digital display device that displays an operation amount of an operation object, a detection unit that detects an actual operation amount when the operation object is operated, a digital display unit that displays the actual operation amount with a predetermined number of digits, and A value that is closest to the actual manipulated variable in the number of significant digits that can be displayed on the digital display unit is determined as an actual display value, and calculating means for obtaining a deviation between the actual display value and the actual manipulated variable, Comparing an arbitrary tolerance predetermined so as to allow and display the actual manipulated variable as an actual display value and a deviation obtained by the computing means, and obtaining a magnitude relationship between the two values; A digital display device comprising display control means for switching and controlling a display mode of the digital display unit according to a comparison result.   2. The digital display device according to claim 1, wherein the calculation unit obtains two display values when a value less than the number of display effective digits included in the value of the actual operation amount is rounded down and rounded up, and the display control unit. When the operation object is operated, when the deviation becomes larger than the tolerance by comparison of the comparison means, the two display values obtained by the calculation means are alternately displayed on the digital display unit. A digital display device characterized by being configured as described above.   3. The digital display device according to claim 2, wherein the display control unit obtains the calculation unit according to the magnitude of the deviation when the deviation is larger than a tolerance by comparison of the comparison unit. A digital display device configured to change a display switching speed of two display values. 4. The digital display device according to claim 1, wherein the display control means further has a deviation smaller than a tolerance by comparison of the comparison means in a process in which the operation object is operated. In this case, the digital display device is configured to continuously display the actual display value on the digital display unit.

Images