JPS63254630A - Digital apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital device suitable for use as a monitoring needle for, for example, factory equipment.

[Summary of the invention]

This invention provides magnetic sensing means on the surface of the casing or in the vicinity thereof,
The operator holds a magnetic field source such as an electromagnet or a permanent magnet in his/her hand and brings it close to the magnetic sensing means to input information such as programs, making it easy for outsiders to input the program contents. It is designed not to be changed.

[Conventional technology]

In recent years, digital instruments equipped with microcomputers (hereinafter referred to as microcomputers) have become widespread.

In this type of digital instrument equipped with a microcomputer, the user can freely program the input signal range, indicated value, output voltage, etc., using pushbutton switches, rotary switches, and digital switches installed on the operation panel. It is designed to allow input operations.

[Problem that the invention seeks to solve]

However, in conventional digital instruments, switches such as pushbutton switches for inputting the program are located in locations that can be easily operated by outsiders who are not involved in programming the digital instrument. There was a concern that the program contents could be easily changed by an outsider touching the switches.

[Means for solving problems]

This invention was devised to prevent information input from outsiders.In this invention, magnetic sensing means for converting changes in magnetic lines of force into electrical signals is provided on the surface of the casing or near it, and magnetic field lines can be accessed from the outside. Information is input by bringing the source close to this magnetic sensing means.

[Effect]

Information can only be input by a user bringing a source of magnetic lines of force such as an electromagnet or a permanent magnet close to the magnetic sensing means, and input operations cannot be performed simply by touching the source, thereby preventing input operations by outsiders.

〔Example〕

FIG. 1 shows the main parts of an embodiment of the present invention, and FIG. 1A is a perspective view of the digital device viewed from the front panel side;
Figure B is a diagram for explaining how to input information.

In FIG. 1A, (1) shows the housing of this digital device as a whole, and (2) shows the front panel. In this example, this front panel (2) has a liquid crystal display section (3).
A display control signal from a microcomputer (not shown) provided in the casing (1) is supplied to the liquid crystal display section (3) via a display drive circuit to produce a predetermined display.

In this example, marks (4M) and (5M) as shown in FIG. B are attached to the left and right surfaces of the liquid crystal display section (3) of the front panel (2). Then, on the back side of the front panel (2) inside the case (1) corresponding to the positions of these marks (4M) (5M), there is a
) in close proximity to a magnetically sensitive element, in this example a reed switch (
4) and (5) are provided as shown in FIG. This reed switch (4) (51 is not shown, but the casing (
It is connected to the microcomputer in 1) via an interface, and information can be input to the microcomputer by turning on and off the reed switches (4) and (5). Marks (4M) and (5M) indicate the positions of reed switches (4) and (5).

This mark (4M) (5M) may also serve as a company logo or other display, for example.

Using the marks (4M) and (5M) as landmarks, information is input using the reed switches (4) and (5) in the following manner.

In other words, as shown in FIG.
and bring it close to the mark (4M).

Then, an induced current flows through the coil of the reed switch (4), turning the reed switch (4) on. Next, when the permanent magnet (7) is moved away, the reed switch (4) is turned off again. Similarly, the reed switch (5) also has a permanent magnet (
7) You can turn it on and off by moving it closer or farther away, and you can input information.

In addition, at this time, mark (4M) (5) of permanent magnet (7)
By attaching a soft material such as rubber to the side that approaches M) or surrounding it with a soft material, it is possible to prevent the front panel or the liquid crystal surface from being damaged.

FIG. 2 shows another example of the invention.

In the figure, (8) is a case, (9) is a front panel, and a plurality of fingertip pressure type switches (10) are provided on this as shown in the figure. Further, (11) is a liquid crystal display section similar to that described above. In this example, multiple switches (10)
Inside the case (8) on the back side of the front panel (9), a plurality of Hall elements (12) as magnetically sensitive elements are provided as shown by broken lines in the figure.

Further, a Hall element (12) is also provided inside the casing (8) on the back side of the liquid crystal display section (11).

In this example, as in the normal case, a predetermined input operation can be performed by pressing the switch (10) with the tip of a finger. However, in this example, when the permanent magnet (7) is brought close to the switch (10) without pressing the switch (10) with the tip of the finger, the Hall element (12) behind it detects it. And this Hall element (12)
Different input information can be set depending on the voltage obtained. That is, the switch (10) is placed in the same position on the front panel (9).
This is equivalent to providing another input means overlapping the Hall element (12). Similarly, the Hall element (12) provided on the back side of the front panel (2) overlapping the position of the liquid crystal display (11) can be used to set input information using a permanent magnet brought close to the Hall element (12).

As in this example, if the magnetically sensitive elements used as information input means are stacked behind the various components provided on the surface of the front panel (9), it is possible to This is advantageous when it is desired to provide a large number of information input means. Moreover, since only a person who has a magnetic field source can perform input operations on the magnetically sensitive element, the input means exposed on the surface of the panel (9) is used for input purposes that will not have a major effect even if touched by an outsider. , the input means using a magnetically sensitive element is
It can also be used for different purposes, such as for inputting programs and the like that should not be changed by outsiders.

In addition, in order not to lose the permanent magnet (7) as a source of magnetic lines of force, a magnet storage part (13) made of a magnetic material such as iron is installed in a part of the case (1) or (8) as shown in Figure 3. It is convenient if you set it up.

Note that the source of magnetic lines of force is not limited to the permanent magnet (7), and an electromagnet can be used. When using this electromagnet, if the magnetic sensing means is a Hall element that can obtain an output according to the amount of magnetic flux, multiple inputs are possible by changing the power source of this electromagnet. . Furthermore, if a power source modulated with a signal having meaning is used, it becomes possible to input the meaning as is.

[Effects of the Invention] According to the present invention, the magnetic sensing means is provided on the housing side, and information input operations are performed by bringing the magnetic field source close to the magnetic sensing means, so that information input operations are performed in the same manner as input operations using conventional push button switches, etc. , there is no inconvenience that input operations are easily performed by outsiders.

Moreover, since it is possible to install the magnetic sensing means in a part that is not visible from the surface of the casing, there is almost no possibility of an erroneous input operation by an outsider.

Further, since the magnetic sensing means can be installed behind the components provided in the operation panel section of the enclosure, there is an advantage that space efficiency is good.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an outline of one embodiment of the invention, FIG. 2 is a diagram showing another example of the invention, and FIG. 3 is a diagram for explaining the invention in detail. (11 and (8) are the case, (2) and (9) are the front panel, (3) and (11) are the liquid crystal display section, (41 (5)
1 is a reed switch, (7) is a permanent magnet, (10) is a fingertip pressure type switch, (12) is a Hall element, (13)
is a storage part for permanent magnets.

Claims (1)

[Claims] 1. Magnetically sensitive means for detecting changes in magnetic lines of force and converting them into electrical signals is provided on or near the casing surface, and a source of magnetic lines of force is brought close to the magnetically sensitive means from the outside. A digital device on which information can be entered. 2. Magnetic sensing means that detects changes in magnetic lines of force and converts them into electrical signals is provided inside the back of the component placed on the surface of the casing,
A digital device in which information is input by externally applying magnetic lines of force from a source of magnetic lines of force to the magnetic sensing means via the components. 3. The digital device according to claim 1 or 2, wherein the magnetic field line source is constituted by an electromagnet, and information is input by controlling the power supply of the electromagnet. 4. The digital device according to claim 1 or 2, wherein the magnetic field line source is composed of a permanent magnet, and the casing is provided with a magnetic portion that attracts and accommodates the permanent magnet. 5. The digital device according to claim 2, wherein the component is a fingertip pressure type switch provided on the operation panel surface of the casing. 6. The digital device according to claim 2, wherein the component is a display provided on the surface of the casing. 7. The digital device according to claim 1 or 2, wherein a portion of the magnetic source that is likely to come into contact with the housing surface is made of a soft material.