JPS5934107A - Portable digital machine for measuring displacement - Google Patents

Abstract

PURPOSE:To prevent an erroneous count and an erroneous display caused by an external noise, by enclosing a part of an electronic circuit with an equipotential band and insulating the part of a measurer, which should be brought into contact with an object to be measured, from a measuring machine body including the electronic circuit. CONSTITUTION:An electronic circuit 16 is enclosed completely with the equipotential band constituted with a main frame 12 made of a conductor, to which the cathode of a battery 18 is connected, and a case cover 20 made of a conductor as well. The part of a spindle 14 which should be brought into contact with an object 8 to be measured is insulated electrically from the measuring machine body including the circuit 16 by an insulating material contact 22. Thus, the circuit 16 is protected from the external noise, and consequently, the erroneous count and the erroneous display peculiar to a portable device are resolved to perform the measurement with the same high precision as a stationary device.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a portable digital displacement measuring device, and in particular,
A main frame, a measuring tip that is slidably supported by the main frame and whose tip comes into contact with the object to be measured, and a sensor built into the measuring machine body that digitally detects the displacement of the measuring tip. The present invention relates to an improvement in a portable digital displacement measuring device having a built-in electronic circuit and a built-in battery for driving the electronic circuit.

Generally, in a displacement measuring machine that measures the length of an object,
When measuring the amount of movement of something that moves relatively, such as during the movement of a probe relative to its main body or during the movement of a slider relative to a column, a detector containing a main scale on one side and an index scale on the other is fixed. Digital displacement measurement +11 or 111 is used to digitally read the amount of relative displacement between the main scale and the detector.

This digital displacement measuring device includes not only a detector, an electronic circuit, and a display, but also a portable digital displacement measuring device with a built-in battery that serves as a power source, and most of the above components. It is broadly classified into a stationary digital displacement measuring device with a separate power supply.

Among these, the former has the characteristic that the displacement measuring device can be easily used at any site, and is widely used.
Even when using an electronic circuit very similar to that of a stationary digital displacement measuring machine, there is a problem in that there are extremely many chances for display errors to occur irregularly. This problem is particularly severe when electronic circuits that are small and consume little power are used to package electronic components.

The present invention was made to solve the above-mentioned conventional drawbacks, and does not cause counting errors or display errors, and therefore can easily measure high v4 degrees equivalent to a stationary digital displacement measuring machine. The purpose is to provide a portable digital displacement measuring device that can perform

The present invention includes a main frame, a measuring tip slidably supported by the main frame and whose tip comes into contact with an object to be measured, and a measuring device for digitally detecting the displacement of the measuring tip. (In a portable digital displacement measuring machine having an electronic circuit built into the main body and a battery also built into the measuring machine main body for driving the electronic circuit, at least a part of the electronic circuit is Along with surrounding it with a potential band,
The object is achieved by electrically insulating the part of the probe that contacts the object from the main body of the measuring instrument including the electronic circuit.

Further, by forming the equipotential zone with the main frame made of a conductive material, the equipotential zone can be easily formed.

Furthermore, by connecting one electrode of the battery to the equipotential zone, complete shielding by the equipotential zone can be achieved.

Further, the part of the measuring head that contacts the object to be measured is formed of a ceramic material, so that the contact of the measuring head with the object to be measured and the contact part can be easily insulated from the main body of the measuring machine.

51 The authors investigated and researched a large number of practical measurement quantities and their usage conditions, and were able to confirm that the causes of counting and display errors in portable digital displacement measuring instruments were as follows. That is, a portable digital displacement measuring device needs to be made smaller and lighter overall for its portability, and therefore the body case and the like are often made of plastic. Furthermore, in order to maintain longer battery life, electronic components and circuits are designed to use even lower voltages. Furthermore, due to its portable nature, the entire measuring device must be electrically floating. Therefore, compared to a stationary digital displacement measuring machine, it is much more susceptible to external noise.

Moreover, the first thing to note is that in most cases, the measurement table is held floating above the ground, and the object to be measured placed on it is charged with an extremely large amount of static electricity. It is a fact. This is thought to be due to being charged immediately after processing or during movement to the measurement table.

Therefore, one measurement is performed by bringing the spindle into contact with the object to be measured.
For example, for contact type portable digital transformers such as dial gauges! In the measuring machine, a reverse voltage is applied through the spindle, which causes miscounts and/or misdisplays.

To solve this problem, it is possible to connect one cable to the ground from the main body case, etc.
Such a method cannot be adopted because it may impair portability, which is the original function of a portable device.

The present invention has been made based on the above findings.

Embodiments of the portable digital displacement measuring device according to the present invention will be described in detail below with reference to the drawings.

A first embodiment of the present invention includes an annular main frame 12 and a main frame 12 as shown in FIGS. 1 and 2.
A spindle 14 is slidably supported by a spindle 14 whose tip abuts against the object to be measured 8, and the displacement of the spindle 14 is digitally detected! , second, an electronic circuit 16 built into the measuring instrument main body, and for driving the electric circuit 16;
Similarly, in the portable digital meter (A full gauge 10), which has a battery 18 built into the measuring instrument body and a case cover 20, the main frame 1.'+ 2 and the case horn 20 are made of a conductive material, for example, metal. year,
The electronic circuit 1 is connected to the main frame 12 by connecting one electrode of the battery 18, for example, a wire.
The contact of the spindle 14, which is completely surrounded by an equipotential zone around the periphery of the spindle 14 and has conventionally been made of steel balls 15 and carbide balls, is shown in detail in FIG.

By replacing the contact element 22 made of an insulator such as a pyramid or ruby (hereinafter referred to as an insulator contact element), the contact part of the spin 1-ru 14 with the object to be measured 8 can be replaced with the electronic circuit 1G. It is designed to be electrically insulated from the measuring device itself, including the measuring device.

In FIG. 1, 24 is a tension spring for applying a measuring force to the spindle by pushing the spindle 14 in the direction of contact with the object to be measured 8, and 26 is
A main scale 28, which is fixed to the main frame 12 and has, for example, a graduation stripe for displacement detection consisting of nine transmitting parts and a shielding part formed in a cross pattern on a glass substrate, is a spin 1 A scale stripe for detecting displacement and suspension is formed by alternating light transmitting parts and shielding parts formed on the M plate 14, which is also made of glass and is fixed to the M plate 14.
The scale 30 is a measuring stand, and in FIG. 3, 312 is a contact holder made of brass, for example.

In this way, the electronic circuit 1G is completely surrounded by an equipotential zone consisting of the main frame 12 made of a conductor and the case cover 20 also made of a conductor, to which the cathode of the battery 1B is connected. At the same time, the electronic circuit 16 is protected from external noise by electrically insulating the contact portion of the spindle 14 against the object to be measured 8 from the measuring instrument main body including the electronic circuit 16 using the insulator contactor 22. Therefore, it is possible to eliminate counter errors and display errors peculiar to portable types, and to perform highly accurate measurements equivalent to those of stationary types.

In this example, the equipotential zone is the main frame 1.
Since the electronic circuit 1G is completely surrounded by the electronic circuit 1G, there is very little possibility that it will be affected by external noise. Note that the effect of forming an equipotential band around the electronic circuit 16 is limited to this.For example, the case cover 20 may be made of the same insulator as the conventional one (for example, Plus Deck), and the equipotential W1@main line It is also possible to configure the system with only 12 modules, and even in this case, the effective performance can be determined. Furthermore, the equipotential zone may be constructed from a member other than the main frame 12 or the case cover 20, for example, the case body.

In addition, in this embodiment, a steel ball made of a conventional S electric body or (
By replacing the contact of the spindle 14, which used a hard ball, with an insulator contact 22, the part of the spindle 14 that contacts the object to be measured is electrically insulated from the main body of the measuring machine. Therefore, insulation can be easily performed. Note that the configuration for electrically insulating the part of the spindle I11 that contacts the object to be measured from the measuring machine body is limited to this. It is also possible.

Next, a second embodiment of the present invention will be described in detail with reference to FIG.

This embodiment has a main room 42 which is approximately horizontally placed and has a Y-shape, and a main room 42 which can be opened and opened (supported by the main frame 42).
A spindle 44 whose tip comes into contact with the object to be measured 8 (a 2-kit electronic circuit 46) is used to detect the mobility Kt of the spindle 114.
The portable type 7? has a battery 48 which is also built into the main body of the measuring device and is used to drive the electronic circuit 46. Digital micrometer 40 [where the electronic circuit 46 is
The lfj% pole of the battery 48 is surrounded by an equipotential zone made of a shield case 50 made of a dielectric material, and the part of the spindle 44 in contact with the object to be measured is surrounded by an insulator made of, for example, a ceramic material. 52, the electronic circuit 4
6. In the figure, 54 is an anvil C4.

In this embodiment, similar to the first embodiment described in IFI, it is possible to prevent misprints and display errors caused by external clutter.

Next, the third embodiment of the present invention will be explained in detail with reference to FIG.
As of April 4th, this embodiment includes a main frame 62 having a substantially U-shape, which is slidably supported by the main frame 62 via a detector 63, and whose tip is in contact with the object to be measured. a measuring head 64,
An electronic circuit 66 built in the detector 63 for digitally detecting the moving position of the measuring head 64, and a battery 68 built in the detector 63 for driving the electronic circuit 66. In the battery-built-in auxiliary type hydraulic hydraulic gauge 60, the electronic circuit 66 is surrounded by a shield case 70 made of a conductor to which the cathode of the battery G8 is connected, and the measuring element 64 is surrounded by a ceramic U. l'l
An insulating hole 72 made of W is fixed to the detector 63 with fl L, and the part of the probe 6/I in contact with the object to be measured is electrically insulated from the detector 63 including the electronic circuit 66. This is how it was done.

In the figure, 74 moves the detector 63 vertically along the upright part of the main frame 62! 1111, the handle 76 is a stone surface plate.

In this embodiment as well, similar to the first embodiment, it is possible to prevent display errors due to external Vtt=.

Note that in this third embodiment, the detector 63 was provided with a probe 64 that came into direct contact with the object to be measured;
The scope of application of this photoelectric device is limited to this high 1-gauge, and for example, as shown in FIG. A movable contact 80a fixed to the rear end of the child 78, the movable contact 8
A pair of fixed contacts 80 arranged at positions where they can come into contact with Qa
It is obvious that the present invention can be similarly applied to a digital high 1-gauge with a built-in battery using the touch sensor leaf 5 made of B, C, etc. In this case, an insulator 82 made of a ceramic material or the like is provided at the tip of the contact 78 to provide insulation 14.
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1; J> In the previous example, a5 was used (in each case, the cathode of the battery is connected to the equipotential band), but the potential of the equipotential band is (It is not necessary to spell it the same as a. For example, it is also possible to connect the anode of the battery to the equipotential zone.

In each of the above-mentioned embodiments, the present invention provides an index gale and a menschule in which a scale for detecting displacement consisting of a light transmitting part and a shielding part is formed. Although the present invention was applied to a portable digital displacement measurement example equipped with a photoelectric displacement detection device, the scope of application of the present invention is limited to this example. It is clear that the formula displacement mll can be applied in the same way to any number of cases.Also, it is not necessarily a digital display, but it can be similarly applied to those that take the output point.As explained above, the present invention According to this method, it is possible to prevent errors and display errors due to external noise, and it is possible to easily perform high-precision measurements equivalent to the C1 stationary @ type digital displacement measuring machine. As soon as you can do it, remove the lost effect.

[Brief explanation of the drawing]

FIG. 1 is a front view including a partial view of the portable digital measuring device according to the present invention, which has the configuration of the first embodiment of the vertical measuring device;
2 is a sectional view showing the structure of the equipotential zone in the first embodiment, FIG. 3 is an enlarged sectional view of the
The figure shows the configuration of the second embodiment of the portable digital displacement measuring device according to the present invention, and is a front view including a partial top view, and FIG. FIG. 6, which is a front view including a top view, is a diagram 71'1ffi showing the configuration of the power sensor used in a modification of the third embodiment. 8...Object to be measured, 10...Portable digital type die\full gauge, 12.
42.62...Mainframe 1/1.44...
Spindle, 16.46.66...Electronic circuit, 18.48.68...Battery, 20...Case cover, 22...Insulator contactor, n
(,-), °70... Nord 1~/1-s, 5:
), 72, ε12...Insulator. 63...Detector, 64...Measurement element, 75...Yu'/r ly, :/→), "/8...Contact element. Agent Takaya Ron (one idiot) ) Fig. 1 2nd factor, 2C ~ 14 2 Fig. 4 -33 = Fig. 5 1 60 6 Fig. 6 5

Claims (4)

[Claims] (1) A main frame, and a measuring tip slidably supported by the main frame, the tip of which comes into contact with the object to be measured;
A portable digital device having an electronic circuit built into the measuring device body for digitally detecting the displacement of the measuring head, and a battery also built into the measuring device body to drive the electronic circuit. In formula displacement measurement 1, at least a part of the electronic circuit is surrounded by an equipotential zone, and a part of the measuring head that contacts the object to be measured is electrically insulated from the measuring instrument body including the electronic circuit. A portable digital displacement measuring device characterized by: (2) The portable digital displacement measuring device according to claim 1, wherein the equipotential zone is constituted by the main frame made of a conductive material. (3) The portable digital displacement measuring device according to claim 1 or 2, wherein one electrode of the battery is connected to the equipotential zone. (4) The portable digital displacement measuring device according to claim 1, wherein the measuring object contacting portion of the probe is made of a ceramic material.