JPS6280515A - Displacement detecting device - Google Patents

Abstract

PURPOSE:To measure a displacement position and obtain a high-accuracy absolute value by obtaining digital signals intrinsic to respective electrodes corresponding to the electrodes that a sliding electrode which moves according to the displacement of an object to be measured contacts. CONSTITUTION:When the sliding electrode 10 stops in contact with an electrode 6 on the surface of a substrate 3 at a position shown by an arrow A, the elec trode 10, a convergence line 7, and a lead-out line 40 are all grounded. Then, the lead-out line 40 and pattern wiring 12a are connected together by a coupling piece 41, so a diode D1 and a resistance R1 are grounded. At this time, a nega tive logic signal '0' is obtained at a lead-out point P1. Similarly, a signal '0' is obtained at points P2 and P3. Further, the lead-out line 40 and pattern wires 12d and 12c at two positions which continue toward the center of the substrate 3 are not connected, so diodes D4 and D5 and resistances R4 and R5 are not grounded. At this time, a signal 1 is obtained at lead-out points P4 and P5. Therefore, signals obtained at points P1-P5 are 0, 0, 0, 0, 1, and 1 and this one digital signal is used to determine an electrode 6 that an electrode 6 contacts at a position shown by an arrow A.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a displacement detection device for detecting rotation or displacement of an object to be measured.

[Technical background of the invention and its problems]

Conventionally, for example, in a coterie encoder, which is a type of displacement detection device, a digital button is used, as shown in FIG. A conductive brush 502 that slides into contact with a disc-shaped code plate 501 for each channel on the code plate 501 is fixed to a rotating shaft 503 that rotates coaxially with the rotation of the measured object. An angle signal indicating the absolute value of the rotation angle of an object was obtained. In such an encoder, in order to improve the resolution of the detected rotation angle, it is necessary to increase the number of digits of the digital button, which causes the problem that the diameter of the code plate 501 becomes large, making the device large and expensive1.゜Also, if the number of digits is increased by arranging the digital buttons finely in the radial direction on the code plate 501, high scanning accuracy can be achieved with the brush 502 that slides into contact with each channel while orbiting on the code plate 501. is required.

[Purpose of the invention]

The present invention has been made in view of the problems of the prior art described above, and its purpose is to provide a displacement detection device for an ultra-flat shed that can detect displacement positions with accurate absolute values. be.

[Summary of the invention]

The present invention, which has been made to achieve the above object, includes a plurality of first dragons a arranged in a row at a predetermined interval in a desired area, a plurality of first dragons a that move along the row of the first electrodes, and a sliding electrode that sequentially makes sliding contact with the first electrode, and a sliding electrode that extends across the first electrode, and the I-th four poles are connected with a predetermined encoded electrical connection point; Each of the second electrodes and the sliding magnetic pole are electrically connected via a plurality of second electrodes that are in contact with each other and the first electrode that is in contact with the sliding electrode. This displacement detection device is characterized by comprising code signal output means for outputting a state as a signal.

[Effects of the Invention] According to the present invention, a unique digital signal can be obtained for each electrode according to each electric machine that the sliding magnetic pole that moves in response to the displacement of the object to be measured is in contact with. The displacement position can be measured with highly accurate absolute values.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary encoder as an embodiment of the present invention will be described in detail below with reference to the drawings. Note that the same parts are given the same numbers throughout the drawings.

One embodiment shown in FIGS. 1 to 4 is an example in which the present invention is applied to a rotary encoder.

In this embodiment, the structure is as shown in FIG. 1. On the upper surface of the flat cylindrical case l shown by the dashed line in the drawing, there is a rotary bearing (not shown) that slows down the rotation of the object to be measured. A moving rotating shaft 2 is held perpendicular to the above-mentioned upper surface, which is an axial center.

Inside the case 1, the other end of the rotating shaft 2 is rotatably located on the upper surface of the case 1, and the rotating shaft 2 and a disk-shaped base plate 3, which is penetrated through the center by the screw, are connected to the case 1. The edge of the board 3 is 120° parallel to the top surface of the
Each is fixed at three locations with screws 4. On the lower surface of the case 1 of the substrate 3, a plurality of disk-shaped electrodes 6 are arranged in a row at equal intervals on a circumference concentric with the disk-shaped substrate 3, and the center portion of the substrate 3 is connected to each electrode 6. A convergence line 7 made of a conductive metal piece converging on the substrate 3 is arranged on the substrate 3 1, a rotating shaft 2 passing through the substrate 3, and a rotating shaft 2 with one end on the other end.
A magnetic pole 6 is fixed to the substrate 3 and the other end is arranged circumferentially on the substrate 3.
A rotating member 5 that revolves around the top of the rotating shaft in accordance with 20 rotations is fixed, and a sliding electrode 10 consisting of a protrusion that contacts the electrode 6 is provided at the other end of the rotating member 5 at a position facing the electrode 6.
is located. That is, this sliding electrode 10 is connected to a rotating member 5 that rotates inside the case l as the rotating shaft 2 rotates.
The electrodes 6 sequentially come into sliding contact with the electrodes 6 arranged in a circumferential manner. Next, the structure of the substrate 3 will be explained in detail with reference to FIG. As mentioned above, the electric current Q 6 J5 and the convergence line 7 are arranged on the bottom surface of the case l of the board 3, but from each convergence line 7 there is a lead-out (not shown) for electrical conduction to the back surface of the board 3. The line extends through a circular opening hole 20 that is perpendicular to the plane of the substrate 3. Five lead-out holes 20 are formed along each convergence line 7 at equal intervals at different radial positions from the center of the disk-shaped substrate 3 for each convergence line 7 . On the back side of the substrate 3, there are five lead-out holes 20 arranged in a concentric circumference as shown by the dotted lines in the figure.
A batten wiring 12 consisting of five concentrically arranged electric conductors is formed between the center side of the substrate 3 and the conductive holes 20 arranged on each circumference at positions that do not overlap with the two. As shown in FIG. 4, the button wiring 12 and the predetermined lead-out wires are electrically coupled to the back surface of the substrate 3 by a connecting piece made of a conductive metal piece. That is, the electrode 6 and the convergence line 7 in contact with the sliding electrode 10 disposed at the tip of the rotating member 5 are arranged on the surface of the substrate 3, the convergence line 7 is slammed wired, and the convergence line 7 leads to the lead-out hole 20? 0. A lead wire 40 extends through the lead wire 40 with its tip end slightly protruding toward the sandwiching surface of the substrate 3. The leading end of the lead wire 20 and the button wiring 12 disposed on the center side of the substrate 3 are maintained in an electrically connected state through a soldered coupling piece 41.

Next, the configuration of the back surface of the substrate 3 will be described in detail with reference to FIG. , out of the lead-out holes 20 formed in a circumferential manner in units of 32 along five concentric circles, the lead-out line cuts protruding from the lead-out holes 20 arranged in rows at equal intervals on the outermost circumference and arranged in a circular center circumferential manner. The outermost batten wiring 121 among the batten wirings 12
are connected by connecting pieces 41 with every other derived line 40 starting from a predetermined convergence line 7. The lead-out wires 40 of the lead-out holes 20 circumferentially arranged inside the outermost lead-out hole 20 and the inner button wiring 12'b are arranged so that each lead-out wire 40 is arranged every second with the same convergence line 7 as the starting point. Two pieces are consecutively connected by a connecting piece 41. Similarly, the lead-out lines 40 of the lead-out holes 20 arranged circumferentially on the inside and the inner button wiring 12'c are connected to each lead-out line 4 with the same convergence line 7 as the starting point.
Four pieces of 0 are connected in succession with a connecting piece 41 at every fourth piece. Furthermore, the lead-out line 40 of the lead-out hole 20 circumferentially arranged inside and the inner button wiring 12M are the same as the convergence line 7.
Starting point is the derivation hole 2 which is further circumferentially arranged inside.
With the derived fish signal of 0 and the inner slam wire 12''e, there are cases where there are 8 consecutive wires every 8 wires, and 1 wires where every 16 wires are connected.
In the case of six consecutive pieces, they are connected using a connecting piece d. 5 slam wiring 12).

124, 12-c, 12-d, and 12-e, each of which has seven nodes connected to a resistor R.1. R・2. R・3.几・
4. Diode Dφ1.R, connected to @5. D.2. D
・3. D.4. D-5 is connected, and one end is connected to the diode D.1. D.2. D@3. D.4. Resistors B・l, fL・2. connected to D・5. R・3. l'L・4. IL・
5 the other end is connected in common and connected to the power supply VCC. Diode D.l, D.2. D.3. D.4. D.5-7
Node and each resistor n-1, R-2, R-3, 几・4. R,
−5, the negative logic signal is derived from the points P−1 and P
・2. p.3. P.4. Signal is extracted to P.52
That is, by connecting the sliding electrode 10 installed at the other end of the rotating member 5 to the 7th line, the lead wire 40 that is electrically connected to the electrode 6 in contact with the sliding layer 810 is grounded. For this reason, when the connecting piece 41 is connected to the lead-out line, each corresponding button wiring is similarly connected to the r-wire, so that each diode D, 1°D, 2. D.3. D.4. D・5 and the resistors connected to them R-1, It-2, R-3, 几-4,
Of a-5! - 12%, 12
-b, 12-c, 12-d, and 12-e are connected to ! - short-circuited to 3, at this time short-circuited lettuce (, t -)' D-1, D-2, D-3, D
−4, each derived point p− derived from the r node side of D−5
t, p・2. p・3゜P・4. A @0'' signal is sent to P.5, and the diodes D.l and Dφ2 are not shorted.
．． D sound 3. D.4. From D.5, a signal of "1" is sent to each derivation point P@l, Plu2. P.3. P.4. 7 sent to P.5, each of these derivation points P-1, P.2. p・3゜P・4
．． A set of negative logic signals sent to each P.5 has a digital signal digit at the beginning of "2°+2"@2"123*
The set of negative logic signals thus obtained in step 5 is specified so that the diode, resistance, and resistance shorted by the coupling piece 41 soldered to the back side of the board are different for each electrode. Therefore, the grounded electrode can be determined based on a set of negative logic signals extracted at the derivation point of the negative logic signal, and therefore the position of the sliding electrode 1o, that is, the rotation angle of the object to be measured, can be determined. can be detected in absolute value.

Here, a concrete example will be presented, and a set of negative logic signals unique to each electrode will be generated at each derivation point P-1, P.2, . p・3゜P・4.
This shows what can be obtained with P.5. For example, when the sliding electrode 10 moving on each electrode due to the rotation of the object to be measured comes into contact with the electrode i10 on the surface of the substrate 3 at the position indicated by the arrow in FIG. 3 and stops, the electrodes 10 are connected to each other. convergence line 7
And all derived line cuts! - be scanned. And board 3
Since the lead wire 40 located on the outermost side of the board 3 when looking at the back side and the button wire 12.a are connected by the coupling piece 41, the diode D@1 and the resistor R-1 are ! - shorted to ground.

At this time, a negative logic signal "o" is obtained at the derivation point P-1.Similarly, two derivation lines 40 and two batten wirings 12 are connected along the convergence line 7 toward the center of the board 3.・
b, 12 and C are connected by coupling pieces 41, so the corresponding diodes D-2 and D
-3 and resistances R-2 and R-3! - shorted to ground 3
, each derivation point P・2. 10 of negative logic signal in p・3
” are obtained.Furthermore, two lead-out lines 40 and two button wirings 12.d, 12.e continuous toward the center of the board 3 are obtained.
are not connected to each other, so the corresponding diodes D and 4. D.5 and resistance 4. R.5 is! −
This special number derivation point P・4. At P.5, a negative logic signal of 11'' is obtained.

Therefore, each derived point PF l, P-2, P-3, P-4
, P-5 is "0.0.0.1.1", and using this digital signal, which is a negative logic signal of the - group, the contact of the sliding electrode 10 is indicated by arrow A in the figure. By determining the position of the electrode 6 based on the digital signal obtained at the derivation point, we can determine the rotation angle of the object to be measured by rotating the sliding electrode. Can be detected by absolute value. Further, the electrodes arranged on the substrate at equal intervals on the circumference may be contacts arranged at equal intervals, and a mechanism for sliding contact with such contacts can be constructed relatively easily.

However, the embodiments of the present invention do not adhere to the above-mentioned contents and can be modified to a certain extent without departing from the technical idea of the present invention. In order to obtain a predetermined decomposition accuracy, five concentric wirings are used on the substrate, but in order to obtain a higher decomposition accuracy, it is necessary to increase the number of electrodes on the substrate, and to increase the number of lead-out holes. Possible measures include increasing the number of lead-out lines and the number of button wiring. In addition, in the embodiment, the digital (M number) indicating the rotation angle is output in binary code, but by connecting each lead wire to the board and changing the connection using the coupling piece, it can be output in gray code. Logarithmic output etc. can be performed.Furthermore, in the embodiment, the digital signal indicating the rotation angle is sewn and output as a negative logic signal, but it may be inverted with a NAND circuit etc. and obtained as a positive logic signal.Furthermore, the board Then, connect the tangent line between each lead-out wire and the batten wire using the fin, and connect it directly using a diode instead of using a one-year-old piece. In this case, all the diodes used in the example are In addition, in Embodiment 3, in order to reverse the direction of the current flowing on the board, a power source is directly connected to the sliding electrode, and each button wiring is connected to r via a resistor and a diode. In addition, the shape of the main parts such as electrodes configured on the substrate, that is, the rotating shaft that supports the rotating member within the case, may pass through the case, and the In order to eliminate the opening in the center of the board, the rotating shaft may be inserted into the case from the opposite direction to support the rotating member.

As detailed above, it has been shown with the embodiments that the displacement detection device of the present invention can be applied to a rotary encoder, but if the technical idea disclosed in this specification is applied, it can also be configured, for example, to a two-wheel encoder. can.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the configuration of an embodiment in which the present invention is applied to a rotary encoder, Fig. 2 is a front view of the main parts of the same embodiment, with some of the main parts extracted, and Fig. 3 is the same embodiment. Figure 4 is a block diagram showing the circuit configuration and some of the main parts in the example. 2 Figure 3 Figure In Figure 5

Claims (1)

[Claims] a plurality of first electrodes arranged in parallel at predetermined intervals;
a sliding electrode that moves along the row of first electrodes and sequentially comes into sliding contact with the first electrode; and a sliding electrode that extends across the first electrode and that the first electrode a plurality of second electrodes connected with a predetermined encoded electrical connection point, and each of the second electrodes connected to the first electrode at a position where the sliding electrode contacts the plurality of second electrodes; and code signal output means for outputting a signal indicating a state of electrical connection between the sliding electrode and the sliding electrode.