CN1187667A

CN1187667A - Position detecting switch

Info

Publication number: CN1187667A
Application number: CN97117581A
Authority: CN
Inventors: 樋口善男
Original assignee: Funai Electric Co Ltd
Current assignee: Funai Electric Co Ltd
Priority date: 1996-08-30
Filing date: 1997-08-30
Publication date: 1998-07-15

Abstract

A switch circuit including voltage dividing elements for dividing a reference voltage inputted from an external source through a reference voltage input terminal, a fixed contact having metallic patterns formed on a board, and a movable contact coming in contact with the metallic patterns so as to slide thereon. The switch circuit not only divides the reference voltage at a voltage dividing ratio corresponding to a currently selected position of an object whose position is to be detected, but also outputs the divided voltage as an analog signal. Some of the voltage dividing elements that serve to switch the voltage dividing ratios are connected in parallel to one another through the fixed contact and the movable contact.

Description

Position detecting switch

The present invention relates to position detecting switch, this switch detects its position, select location place pre-selected locations outside with the position of determined target, and exports testing result with simulating signal.

In the device of the driving mechanism with the employing of video equipment and copying equipment, the diversity of available switch detects the position that drives target.For example, in order to detect the corner that drives target, often adopt rotating switch.

The relation of Fig. 4 between to be that the predetermined corner of 4 output circuit diagrams of rotating switches and rotor (not shown) is corresponding with it export.In Fig. 4, the brush of rotor moving contact is coupled in label 2 representatives; The switch conductor fig that 3 to 5 representatives form on unshowned plate with circle as fixed contact; 6 represent pull-up resistor; 7 represent the input end of power supply (5V); The output terminal of (A, B, C, the D) of 8 representative outputs, 4 bit data.

The label 1-11 of the upper/lower positions of Fig. 4 represents the predetermined corner of rotor.For example, in the time will being (1,1,1,1) from the data of output terminal 8 outputs, brush 2 is positioned at angle position 1.When data become (0,1,1,1), make brush move to angle position 2 by rotating rotor.

Therefore, by checking the position of determining rotor the angle position 1-11 from the data content of output terminal 8 outputs.Can detect the angle position of the driving target that is coupled to rotor like this.

But, in traditional example, when rotating switch must be linked to the analog input interface of microcomputer, must add a D/A converter, thereby expense is increased.

Make the rotary encoder simple modifications become can not dealing with problems fatefully of simulation output type, because can not use the cheap part such as pull-up resistor, the number of part and line increases like this.When the needs wide-voltage range, must adopt the part of many costlinesses, thereby expense is increased.The problem that this expense increases is described with reference to Fig. 2.

This problem is not limited to the rotation position probing such as rotating switch, has same problem for the switch of linear mobile model.

The present invention makes under above-mentioned environment.Therefore, the object of the present invention is to provide a kind of position detecting switch that does not have above-mentioned defective.

In order to realize this purpose, on-off circuit of the present invention comprises: a plurality of sectional pressure elements are used for the reference voltage dividing potential drop of coming from external power source by reference voltage input terminal; Have the fixed contact of a plurality of metallised conductors figures that form onboard, be rushed out recess so that corresponding these a plurality of metallised conductors visuals with pre-selected locations; And contact with the coupling of determined target and with conductor fig with its position and the moving contact of slip thereon as described fixed contact, wherein said on-off circuit not only with corresponding to the intrinsic standoff ratio of the current selected position of target to the reference voltage dividing potential drop, and with simulating signal output voltage after partial, in addition wherein except that described a plurality of sectional pressure elements, the sectional pressure element that is used to switch the dividing potential drop ratio also couples together abreast through described fixed contact and described moving contact.

Fig. 1 is a schematic circuit of the present invention; Be that Fig. 1 is circuit diagram and the predetermined corner of rotor and the corresponding relation of its output of rotation position detecting switch;

Fig. 2 is an effect synoptic diagram of the present invention; Be that Fig. 2 is the circuit diagram that the digital output type rotating switch of supposition is simulated position detecting switch behind the output type switch instead;

Fig. 3 is circuit schematic figure of the present invention; Be the voltage range judged from the voltage range of the simulating signal shown in the position detecting switch and microcomputer according to level of illustrating of Fig. 3 and the tolerance of computing center's value;

Fig. 4 is the schematic circuit of traditional embodiment; Be that Fig. 4 is the relation of the corresponding output with it of predetermined corner of the circuit diagram of digital output type turned position detector switch and rotor;

Embodiment of the invention will be described with reference to drawings.Fig. 1 is circuit diagram and the predetermined corner of rotor and the corresponding relation of its output of rotation position detecting switch; Bottom label 1-11 represents the angle position of rotor (not shown) among Fig. 1.

Position detecting switch described here is installed on the video-unit.Position detecting switch detects the predetermined angle position of the rotating part (with respect to select location) that constitutes magnetic tape station, and with simulating signal output testing result.Position detecting switch has basic structure shown in Figure 1.

In Fig. 1, the reference voltage input terminal of 5 volts of power supplys that label 10 representatives come from the outside, the output terminal of label 40 representative output simulating signals.

Label 20 is represented moving contact, and it is can be with the brush on rotor.Its position will be detected rotary drive through being coupled to moving contact 20 with the switch main body (not shown) neck rotor that touches that is coupling.

The fixed contact that label 30 is represented on the dished plate (not shown) that is attached to switch main body.On this plate is metallized conductor fig 31-33.Metallized conductor fig 31-33 is partly gone out recess with corresponding with the swivel becket position 1-11 that is scheduled to.Moving contact 20 contacts with metallised conductors figure 31-33 and slides thereon.

The drawn metallization conductive pattern 31-33 of Fig. 1 is linear, but be actually the annular.

Label R1-R6 represents sectional pressure element, is used for the reference voltage dividing potential drop of process reference voltage input terminal 10 from outside Calais.Wherein R1 is 4.7K Ω; R2 is 2.2K Ω; R3 is 470 Ω; R4 is 10K Ω; R5 is 3.6K Ω and R6 is 1.5K Ω.

In the present embodiment because reference voltage is a DC voltage and when making sectional pressure element with resistance, the semiconductor circuit etc. that has the same electrical function with resistance also can be used to replace resistance.

Movable contact 20, fixed contact 30, sectional pressure element R1-R6 etc. constitute on-off circuit 1.This on-off circuit 1 will be by reference voltage input terminal 10 input reference voltage with ratio dividing potential drop corresponding to the swivel becket position of current rotor, and with this dividing potential drop with simulating signal by output terminal 40 outputs.

The maximum characteristics of this on-off circuit 1 be sectional pressure element R2-R6 from sectional pressure element R1-R6, these elements R2-R6 forms the intrinsic standoff ratio of switch.Element R2-R6 be inserted in metallised conductors figure 31 or 32 and ground between and be linked to abreast on fixed contact 30 and the moving contact 20.

Be the DC voltage of 0-5 volt shown in Figure 1 and be introduced on the Simulation with I/O interface of the microcomputer of control of video device from the simulating signal of on-off circuit 1 output.

The voltage of simulating signal such as the level of Fig. 3 (1)-(10), according to this, the swivel becket position of rotary drive that will be determined just can be discerned by microcomputer.

For example, as shown in Figure 1, when the swivel becket position of rotor was 0, moving contact 20 only contacted with metallised conductors figure 33, and resistance R 1 just disconnects from sectional pressure element R2-R6 like this, and reference voltage is appeared on the output terminal 40.Afterwards, the voltage of simulating signal is on the 5V of level (10).When the swivel becket position of rotor was 1, conductor fig 33 was shorted on the conductor fig 31 by moving contact 20, made subsequently with sectional pressure element R1 and R2 the voltage that the reference voltage dividing potential drop obtains is appeared on the output terminal 40.As a result, the voltage of simulating signal is on about 4.1V of level (9).For the swivel becket position of rotor is that the situation of 2-11 also has above-mentioned same application.

If use the resistance with 10% precision as sectional pressure element R1-R6, the voltage of simulating signal can present the scope of variation as shown in Figure 3: the 0.78-1.08V of the 0.36-0.52V of level (2), level (3) ... the 3.96-4.26V of level (9).

But although this variation has been arranged, microcomputer also can be judged the swivel becket position of rotary drive error-freely.For example, when the voltage of simulating signal level (2) when 0.36-0.52V changes, the voltage of being judged by Simulation with I/O interface of microcomputer is 0.26-0.65V just, and this meaning is subtracting end permission 1.18V and adding the error that end allows 0.21V with respect to the central value 0.44V that the change range computation from 0.36-0.52V goes out.Therefore, microcomputer can not made similar false judgment.Other situations are also like this.

Rotating switch shown in Figure 4 is simulated the switch of output type simply instead, and its structure is promptly shown in Figure 2.Wherein identical component no longer is given unnecessary details, and only describes the two parts inequality.

In Fig. 2, label 50 is represented fixed contact.Metallised conductors figure 51-53 forms on the plate (not shown).Except that sectional pressure element R1 and R7-R14, also be associated in metallised conductors figure 51 and 52 and be connected into an integral body in order to the R7-R14 that changes intrinsic standoff ratio.These are and top different place.

In position detecting switch shown in Figure 2, need 9 sectional pressure elements altogether and on 9 points, be linked on metallised conductors figure 51 or 52.On the contrary, the present invention needs 6 sectional pressure elements and is linked on conductor fig 31 or 32 on 6 points.Promptly with the situation ratio of Fig. 2,3 of decreased number of sectional pressure element and interface also reduce 3.In addition, the required also corresponding minimizing of lead-in wire with the connector pin.

Therefore, not only cost of parts reduces, and line has also made things convenient for, and cost made in one piece is reduced.Certainly, different with the conventional example of Fig. 4, simulation output type device of the present invention need not add D/A converter between the analog input interface of microcomputer and switch, thereby expense is reduced.

The price of resistance along with its precision from ± 10%-± 5%, ± 2% or ± 1% change and increase sharply.In the present invention, service precision is no problem for ± 10% resistance is used as sectional pressure element R1-R6.Adopt the detection of swivel becket position of the rotary drive of this resistance not have wrong.Described precision at this and be the application as sectional pressure element R1-R6 of ± 10% resistance, its work is also similar when being ± 5% resistance with precision certainly.

That is to say that cheap resistance also can be used as sectional pressure element R1-R6, thereby expense is reduced.In addition, compare with position detecting switch shown in Figure 2, its resistance has reduced 3, and then expense is further reduced.

The present invention is not limited to the foregoing description, the situation that also can have moving contact 20 and fixed contact 30 to exchange.That is to say, the plate that is formed with the metallised conductors figure on it is moved and fix with the contact of metallised conductors figure sliding contact.In addition, switch is not limited to rotary-type, can certainly be for linearly moving.

As described above, can simulate according to position detecting switch of the present invention.Therefore, even when switch is received the analog input interface of microcomputer, do not need D/A converter therebetween yet, thereby expense is reduced.

In addition, less and tie point number between sectional pressure element and metallised conductors figure is less according to the required sectional pressure element number of the switch of analog input type of the present invention, thus make the number of line and the number of pins of connector reduce to minimum.

In addition, do not need high-precision resistance to come as sectional pressure element.Even when the needs wide-voltage range, the number of sectional pressure element still can remain on the rational number, thereby greatly reduces expense on the whole.

Claims

1. position detecting switch, this switch are used to detect its position, select location place outside pre-selected locations with the position of determined object, and with simulating signal output testing result, wherein on-off circuit comprises:

A plurality of sectional pressure elements are used for the reference voltage dividing potential drop of coming from external power source by reference voltage input terminal;

Have the fixed contact of a plurality of metallised conductors figures that form onboard, be rushed out recess so that corresponding these a plurality of metallised conductors visuals with pre-selected locations; And

Contact the moving contact that also slides with its position thereon with determined target coupling and with the conductor fig that is used as described fixed contact,

Wherein said on-off circuit not only with corresponding to the intrinsic standoff ratio of the current selected position of target to the reference voltage dividing potential drop, and with simulating signal output voltage after partial, and

Wherein in described a plurality of sectional pressure elements, the sectional pressure element that is used to switch the dividing potential drop ratio also couples together abreast through described fixed contact and described moving contact.

2. position detecting switch as claimed in claim 1, it is characterized in that adopting and be coupled to its position detected and have a moving contact on the target of a plurality of metallised conductors figures that form onboard, be rushed out recess so that corresponding with pre-selected locations wherein a plurality of metallised conductors visuals, and adopt with as described moving contact and the contacted fixed contact of metallised conductors figure of slip thereon.

3. position detecting switch as claimed in claim 1 is characterized in that described a plurality of sectional pressure element is a resistance.

4. position detecting switch as claimed in claim 1 is characterized in that described position detecting switch is contained on the video-unit.

5. position detecting switch as claimed in claim 4 is characterized in that being introduced on the Simulation with I/O interface of the microcomputer of control of video device from the simulating signal of described on-off circuit output.