JPH0328331Y2 - - Google Patents

Description

[Detailed Description of the Invention] (1) Purpose of the Invention Industrial Application Field The present invention relates to a digital display device for measurement data in electronic length measuring instruments such as calipers and micrometers.

Prior Art As a conventional example, a liquid crystal digital display of an electronic micrometer is shown in FIG. When measuring inches, this micrometer has 11 decimal points and 1 unit.
3. When measuring in millimeters, the decimal point 12 and unit 14 light up. Note that 4 is a 7-segment numeric display section.

Problems that the invention aims to solve As mentioned above, in the conventional example, the decimal point is 11 and the unit is 1.
3 patterns, or patterns of 12 decimal points and 14 units, each requiring four wires.

In addition to reducing the number of wires in such a digital display, the present invention is capable of displaying unit conversion values using 7-segment numbers, and can display whether the value one digit below the effective digit is greater than or equal to 5 or less than 5. This is an attempt to improve accuracy.

(2) Means for solving the structural problems of the invention The digital display device of the invention displays the decimal point of the measured value and the unit in the same segment, and when converting the unit, it displays the decimal point of the measured value and the unit, and when converting the unit, it displays only the significant digits of the converted value that can be digitally displayed. It has a display segment that lights up when the value one digit below the lowest digit is 5 or more, and turns off when it is less than 5.

Effects In this invention, the display segments for displaying the decimal point and units are combined into the same segment for millimeters and inches, which reduces the number of wires and reduces the number of effective digits that can be digitally displayed in the converted value when converting units. By providing a display segment that lights up when the value one digit below the lowest digit is 5 or more and turns off when it is less than 5, it is now possible to display the converted value with further improved accuracy.
Moreover, the increase in the number of wiring lines is reduced compared to the conventional example.

Embodiments Hereinafter, embodiments will be described based on the drawings. 1st
The figure shows an example of the liquid crystal digital display of an electronic micrometer. 1 is the display segment for the decimal point in inches and the unit "IN", 2 is the display segment for the decimal point in millimeters and the unit "MM", and 3 is the conversion when converting units. This is a display segment with a "5" pattern that lights up when the value one digit below the lowest significant digit that can be digitally displayed is 5 or more, and goes off when it is less than 5. 4 is a 7 segment numeric display section.

FIG. 2 shows a system block diagram of an electronic length measuring device using the digital display device of the present invention. 5 is a digital displacement sensor such as an encoder, 6 is a sensor 5
7 is an arithmetic circuit for digitally displaying the value of counter 6;
Also performs unit conversion calculations. 8 is a unit conversion switch, 9 is a driver that drives the display device, and 10 is a unit conversion switch.
It is a display device such as an LCD.

FIG. 3 shows the flow of the millimeter-inch conversion program in the arithmetic circuit of the electronic length measuring system using the digital display device of the present invention.

With the above configuration, calculations are performed according to the program flow shown in FIG. As shown in the block diagram of FIG. 2, the pulse train from the sensor 5 is counted by a counter 6, the arithmetic circuit 7 calculates it for digital display, the unit is converted by a unit conversion switch 8, and the display device 10 is driven by the driver 9 and displayed. As shown in Figure 1, the display segments for the unit and decimal point are the same, so the number of wiring can be reduced, and the number of digits is 1 more than the minimum number of digits.
The numerical value below the digit can now be displayed based on the calculation result.

(3) Effects of the invention In this invention, the number of wires required for the pattern of the decimal point and unit "MM" for millimeters and the decimal point and unit "IN" for inches is only two, which is reduced compared to the conventional example. Furthermore, whether the value one digit below the effective digit of the display data is 5 or more or less than 5 is displayed by a separate wiring, which improves display accuracy and has the advantage that the number of wirings is smaller than before.

[Brief explanation of drawings]

Figure 1 is a front view of the display section of the digital display device of the length measuring device of the present invention, Figure 2 is a block diagram of the length measuring device using the digital display device of the present invention, and Figure 3 is the flow of the conversion program in the arithmetic circuit. , FIG. 4 is a front view of a display section of a conventional length measuring device digital display device. 1...display segment for inches, 2...display segment for millimeters, 3...display segment, 4, 7...segment number display section.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) Displays the decimal point and unit of the measured value in the same display segment, has a unit conversion function, and starts from the lowest significant digit of the converted value that can be digitally displayed. Lights up when the value of the lower digit is 5 or more, and the 5
1. A digital display device for a length measuring instrument having a 7-segment numeric display section, characterized in that a display segment is provided that turns off when the number is below. (2) The length measuring device according to claim 1 of the utility model registration claim, in which the display segment for displaying the decimal point and unit of the measured value is for millimeters and for inches, respectively, in separate and identical segments. Digital display device.