JPS6314282B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an angle detection element used for positioning of a control device, etc.

In recent years, with the rapid development of microcomputers, industrial equipment and the like are rapidly being systematized as computer-controlled devices.

In order to control such industrial equipment, sensors that function to connect mechanical displacement or changes in external factors to a computer are becoming important.

If these sensors are to be controlled by a computer, the input information must be accurate, and more stable and accurate sensors are being developed.

There are many types of such sensors, each with a different functional form, and one of them is an angle detection element that determines or detects an angle.

FIG. 1 is one of the principle diagrams of a position detection method that has been conventionally used in angle detection mechanisms for detecting the rotation angle of machine tools or measuring the inclination of an object. Apply voltages + _E and _-E to It is configured to know.

However, in automatic control equipment using a computer or the like, the detected angle needs to be a digital value. Therefore, in the method using the potentiometer, as shown in FIG.
It is necessary to convert e ₁ and e ₂ into digital data 22 using an A/D converter 21. Further, the angular accuracy of the potentiometer 11 is determined by the resistance of the potentiometer, and the temperature coefficient of the resistance is also required to be small. Furthermore, in this method using the potentiometer 11, due to the relationship between the positions of the sliders 12 and 13 of the potentiometer 11 and the resistance value, if the voltage is applied directly to the A/D converter 21, a shift in the offset voltage will inevitably occur. Put it away. For this purpose, insert impedance conversion using the operational amplifier 23, or
Alternatively, it becomes necessary to correct the obtained digital values.

In order to use position detection using a linear potentiometer for automatic control using a computer, etc., (1) an A/D converter is required; (2)
Requires high precision resistance values to increase accuracy,
A potentiometer with a small temperature coefficient is required, and (3) an offset correction circuit or process is required, which increases the price of the interface and increases the cost of the entire control system.

The object of the present invention is to eliminate these drawbacks (1), (2), and (3) and provide an angle detection element that can directly obtain digital values.

That is, the present invention is a laminate in which an insulator and one or more conductor layers are laminated and integrated, and the laminate has a circular or arcuate curved surface with exposed ends of each conductor layer. is formed, and conductor terminals that connect to each of the conductor portions are formed in a portion of the laminate that is different from the circular or arcuate curved surface, or a portion of each of the conductor portions is exposed. This is an angle detecting element characterized by a structure in which:

Hereinafter, the present invention will be explained with reference to the drawings showing one embodiment.

FIG. 3 is a diagram of a conductor pattern of an angle detection element showing an embodiment of the present invention. The pattern is the protruding part 3
1 and the corner of the notch portion 32, T and S, and all these protruding portions are connected at a common portion 33, and have a through-hole terminal 34 for extraction. The pitch angle between the protruding part and the notch part that goes around from the reference point A and returns to A again is determined by the minimum angle of angle detection, and the angle B is the pitch angle for shifting the through-hole terminal for taking out different patterns. It is something.

The pattern configured in this way is used as a basic pattern, and the pitch angles, T and S of the protruding portion 31 and the notch portion 32 are 2 ⁿ (n=0, 1, 2, . . . P)
P+1 types of patterns with different ratios and different angles of the take-out through hole terminals 34, and through-hole patterns 35 for connecting the take-out through holes of the different layers to the outside.
The conductor was formed into an insulating green sheet by screen printing or the like.

The term "through-hole terminal" or "through-hole pattern" as used herein means a terminal having a hole penetrating the raw sheet at its center, and a conductor formed in the hole during screen printing.

The raw insulator sheet used in this example is 40 to 60% by weight of aluminum oxide and 40 to 60% by weight of crystallized glass.
Mixed powder selected so that the total amount is 100% within the composition range is made into a slurry with a binder, an organic solvent, and a plasticizer, and a raw sheet of 20 μm to 300 μm is coated on a polyester film by slip casting film formation such as the doctor blade method. After molding, peeling, and punching into desired dimensions, a green sheet was obtained. The composition of the crystallized glass powder used here is lead oxide, boron oxide, silicon dioxide, group element oxide, group element (however carbon,
(excluding silicon and lead) oxides at a weight ratio of 3
~65%, 2~50%, 4~65%, 0.1~50%, 0.02
A composition composed of a composition selected such that the total amount was 100% within a composition range of ~20% was used.

Next, as shown in FIG. 4, these raw sheets having P+1 types of conductor patterns are divided into sheets 41 having ²⁰ patterns, sheet 42 having ²¹ patterns, sheet 43 having 22 patterns, and ²³ sheets having P+ ¹ types of conductor patterns. A sheet 44 having a pattern of 2P, a sheet 45 having a pattern of ²⁴ , and a sheet 46 having a pattern of ^2P are stacked in this manner, and then a full conductor sheet 47 having no cutout portion is stacked. In this example, patterns up to P=4 were used. Next, the sheet 48 having the lead-out terminals on one of the upper and lower sides is overlaid with the other insulating raw sheet 49 having no conductor pattern, and is heated to a temperature of 100 to 130°C and a pressure of 200 to 300°C.
It was laminated and pressed at Kg/ ^cm2 .

FIG. 5 shows the above, and FIG. 4 shows the laminate. This laminate is fired at a temperature of 800°C to 1000°C and cut so that the protruding portion 51 is exposed on the circumference ^. ~
A contact terminal surface 63 having a contact terminal 61 having pitches of P+1 types of ^2P , a contact terminal 62 which is a full conductor, each of the above-mentioned ²⁰ to ^2P lead-out terminals 64, and a full-conductor lead-out terminal 65. An angle detecting element having a lead-out terminal surface 66 having the following values is obtained.

FIG. 7 shows an example of application of the angle detecting element of this embodiment, in which an angle detecting object 71 is provided with a contact 73 that is pressed with a constant pressure by a spring 72, and the angle detecting element of the present invention has a contact element 73 pressed with a constant pressure. The terminal surface 63 is attached at a radius R from the center O so that the terminal surface 63 can slide on the contactor 73.

To detect the angle of the angle detection object 71 configured as described above, as shown in FIG. 8, the terminals 81 of all the conductor patterns are connected to GND 82.

Further, the contact terminal 6 with a pitch of ²⁰ to ^2P is detected by the contactor 73 sliding on the angle detection element 83.
1 and the contact terminals 62 of all the conductors are electrically connected. Furthermore, the output terminals 2 ⁰ , 2 ¹ , 2 ₂ . . . 2 ^P of the angle detection element 83 are pulled up to Vcc by a resistor 84 . Therefore, the voltage levels of the pulled-up terminals 2 ⁰ , 2 ¹ , 2 ^{2 .} It becomes a signal.

When the angle detection element of the present invention is used in this way,
Since the angle output is a binary code that can be processed directly by a computer, there is no need for a conventional A/D converter. Furthermore, since the output code for the angle can be at any level by changing the pull-up voltage, all common interface elements can be used, and there is no need to worry about offset shifts. Furthermore, since the pattern is formed by the screen printing method as in the manufacturing process, it is clear that good angular accuracy can be easily obtained. Furthermore, since the sintered material has a small coefficient of thermal expansion, very good temperature characteristics can be obtained.

As is clear from the above description, since the angle detection element of the present invention can be directly connected to a computer or the like, the angle detection circuit can be extremely simple and highly reliable.

In the above embodiment, the T and S of ²⁰ patterns are set at one time, and the maximum is ²³ patterns, which is 360 pitches.
An angle detection element with a resolution of 1 degree has been obtained.

Furthermore, although alumina glass is used as the raw insulator sheet in the above embodiment, it is clear that the same effect can be obtained by forming a pattern on a sheet made of other materials. The position of is not limited in any way, and by cutting it into a donut shape, the shaft etc. can be completely passed through. Furthermore, it is clear that if this cut surface is taken out and used as a terminal, an angle sensing element that does not contain through holes can be made, and more Application examples can be considered.

Note that it is clear that the angle detection element of the present invention can be manufactured using a copper-clad laminate instead of the raw insulating sheet as in the embodiment.

FIG. 9 is a developed view of a contact terminal surface showing another embodiment, in which a reading mark pattern 113 is stacked on the contact terminal surface 111 in addition to patterns 112 of 2 ⁰ to 2 ⁷ so as to appear.

This reading mark pattern 113 has a width smaller than the width of the ²⁰ patterns and is located at the center of the ²⁰ patterns. Further, the reading mark pattern 113 has a terminal 115 extending from the terminal surface 114, similar to the patterns 112 of ²⁰ to ²⁷ .

FIG. 10 shows an example of the connection of the angle detecting element 120, and shows the reading mark pattern 113.
The output terminal 115 is connected to the GND 121. As a result, the contactor 122 can be simply a shot piece, and electrical contact with a moving object as shown in the previous embodiment is not necessary. Further, in the reading device 123, the angle detection element 12
Only when all terminals 2 ⁰ to 2 ⁷ taken out from 0 are in an open state (Vcc level) 255 (decimal number) are they not treated as numerical values and the previously read value is held.

Since the angle detection element configured as described above reads only the position of the reading mark, there is no erroneous detection due to minute positional deviation of the pattern inside the stacked body, and highly reliable angle detection can be obtained.

FIG. 11 is a developed view of a contact terminal surface showing yet another embodiment, in which the contact terminal surface 131 has a width Wp of the electrode portion as shown in the previous embodiment, which is the same as the width of 2 ⁰ (minimum pattern). , and its array state has been changed to become a binary code.

In such a configuration example, since there are no electrodes in unnecessary parts for reading as shown in the above embodiment,
It is clear that the amount of electrode material used in the process of forming the internal electrodes can be gradually reduced, and that the sintering of the electrodes and the ceramic can be improved, resulting in a highly reliable angle sensing element.

If we further enlarge the part that does not need to be read,
It is clear that it can be used as a detection element for arbitrary angles (for example, a detection element with a pitch of 5 degrees, or an angle detection element with angles of 10 degrees, 20 degrees, or other angles), and that a wide range of applications such as angle determination of robots, etc. are possible. moreover,
The arrangement of the ²⁰ to ^2P patterns appearing on the contact terminal surface does not have to be a binary code; for example, if it is a BCD code arrangement or a pattern stored in the reader, it can be used in any order. It is clear that angle detection is possible even if

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of angle detection using a rotary potentiometer. FIG. 2 is a circuit diagram for converting angle detection by a rotary potentiometer into a digital value. FIG. 3 is a diagram of the ²⁰ conductor pattern of this embodiment. FIG. 4 is a diagram in which ²⁰ to ^2P types of patterns of this embodiment are superimposed. FIG. 5 is a diagram showing the laminated sintered body of this example. 6th
The figure is an external perspective view of the angle detection element of this embodiment. FIG. 7 is a structural diagram showing an example of application of the angle detection element of this embodiment, in which it is attached to a moving object. 8th
10 are connection diagrams between the angle detection element and a device such as a computer. FIGS. 9 and 11 are developed views of contact terminal surfaces in other embodiments of the present invention. In the figure, 11...rotary potentiometer, 12 and 13...slider +E and -E...voltage applied to the potentiometer, _e1 and _e2 ...voltage depending on the position of the slider, 21... ... A/D converter, 22 ... Digital data, 23 ... Operational amplifier, 31 ... Projection part, 32 ... Notch part, 33 ... Common part, 34 ... Output terminal,
35... Sur ball pattern, A... Reference point, S
... Corner of the protruding part, T ... Corner of the notch part, B...
...position angle of the take-out terminal, 41...sheet with a ²⁰ pattern, 42...sheet with a ²¹ pattern, 43...sheet with a ²² pattern,
44... Sheet with 2 ³ patterns, 45...
Sheet with 2 ⁴ pattern, 46... Sheet with 2 ⁵ pattern, 47... Full conductor sheet without cutout, 48... Sheet with lead-out terminal, 49... Insulator raw sheet , 51...
Projecting portions, 61 and 62...Contact terminals, 63,1
11... Contact terminal surface, 64 and 65, 115...
Takeout terminal, 66, 114...Takeout terminal surface, 71...Angle detection object, 72...Spring, 7
3,122...Contactor, 81...Terminal, 82...
GND, 83, 120... Angle detection element, 84...
...Resistance, 85,123...Reader, 113
...Reading mark pattern.

Claims (1)

[Claims] 1 A laminate in which an insulator and one or more conductor layers are laminated and integrated, and the laminate has a ring-shaped or arc-shaped curved surface with exposed ends of each conductor layer. and a structure in which conductor terminals connected to each of the conductor portions are formed in a portion of the laminate that is different from the circular or arcuate curved surface, or a portion of each of the conductor portions is exposed. Characteristic angle detection element.