CN203323697U

CN203323697U - Encoder positioning device

Info

Publication number: CN203323697U
Application number: CN2013202989391U
Authority: CN
Inventors: 刘忠齐
Original assignee: Beijing Beiyi Medical Instrument Co Ltd
Current assignee: Beijing Beiyi Medical Instrument Co Ltd
Priority date: 2013-05-28
Filing date: 2013-05-28
Publication date: 2013-12-04
Anticipated expiration: 2023-05-28

Abstract

The utility model relates to an encoder positioning device which comprises an encoder and a signal processing unit, wherein the input end of the encoder is used for being connected with a transmission part to be positioned, the signal processing unit is externally connected with a power supply, the encoder and the signal processing unit are connected through a power line and a COM line, and the output ends of the encoder and the input ends of the signal processing unit are connected through signal lines. The encoder includes a light source, a lens, a code disc, a photosensitive element and an amplifying and shaping circuit. Light emitted by the light source enters the code disc after being converged through the lens; transparent regions and non-transparent regions which are mutually spaced from each other are engraved along the angular direction of the code disc; the code disc can rotate around the axis thereof with linear or angular displacement of the transmission part to be positioned; light converged through the lens passes through the transparent regions or is blocked by the non-transparent regions during the rotation of the code disc; the photosensitive element converts a received optical signal into an electrical signal; and the electrical signal is processed by the amplifying and shaping circuit to form a digital pulse, which is input to the signal processing unit through the signal lines.

Description

A kind of scrambler positioning equipment

Technical field

The utility model relates to a kind of scrambler positioning equipment.

Background technology

In the prior art, the location of the drive disk assembly in medicine equipment or other mechanical hook-ups mainly adopted to optoelectronic switch positioning equipment, approach switch positioning equipment etc.

The principle of work of optoelectronic switch positioning equipment is to utilize detected material to the blocking or reflect of light beam, and by the synchronization loop gating circuit, thereby determines having or not of detected material.The principle of work of approach switch positioning equipment is when the induction region of detected material approach switch, and switch can send electric instruction in contactless situation, reflects position and the stroke of detected material.But, when higher to positioning accuracy request, above-mentioned optoelectronic switch positioning equipment and approach switch positioning equipment all can not meet the demands.

The utility model content

For solving the not high problem of positioning precision in prior art, the utility model proposes a kind of scrambler positioning equipment.

Scrambler positioning equipment of the present utility model comprises scrambler and signal processing unit, the input end of described scrambler is for being connected with drive disk assembly to be positioned, described signal processing unit external power supply, described scrambler is connected with the COM line by power lead with described signal processing unit, and the output terminal of described scrambler is connected by signal wire with the input end of described signal processing unit.Described scrambler comprises light source, lens, code-disc, light activated element, amplification and rectification circuit, the light that described light source sends arrives described code-disc after lens are assembled, described code-disc is carved with transmission region and the light tight zone of each interval along angle, along with described drive disk assembly generation straight-line displacement or angular displacement to be positioned, described code-disc can be around the axis rotation of himself.In the rotary course of described code-disc, the light of assembling through lens is received by described light activated element or is blocked and can not be received by described light activated element by described light tight zone through described transmission region.Described light activated element is converted to electric signal by the light signal of reception, and described electric signal forms digit pulse and inputs described signal processing unit via described signal wire after being processed by described amplification and rectification circuit.Described signal processing unit is processed described digit pulse.

Preferably, described scrambler has two output terminals, described signal processing unit has two input ends, described two output terminals are connected by two signal wires with described two input ends, and described light activated element is two photoreceivers, each photoreceiver all is converted to electric signal by the light signal of its reception, and described electric signal forms digit pulse and inputs two input ends of described signal processing unit through described two signal wires by described two output terminals after being processed by described amplification and rectification circuit.

More preferably, described scrambler also has an additional output terminal, described signal processing unit also has an additional input end, and described additional output terminal often revolves at described code-disc the extra-pulse of time output that turns around, and this extra-pulse is transfused to described additional input end.

Described signal processing unit comprises the bi-directional counter of d type flip flop, the first Sheffer stroke gate, the second Sheffer stroke gate and a plurality of cascades, two input ends of described d type flip flop receive described digit pulse, the output signal of each in two output terminals of described d type flip flop forms respectively the input signal of the first Sheffer stroke gate and the second Sheffer stroke gate with described extra-pulse, the output terminal of described the first Sheffer stroke gate and the second Sheffer stroke gate be connected to respectively in the bi-directional counter of described a plurality of cascades first add pulse input end and subtract pulse input end.

Preferably, the angular width in described transmission region and described light tight zone equates, and the distance between described two photoreceivers equals described angular width half.

Because code-disc can be rotated according to the moving direction of drive disk assembly to be positioned, therefore scrambler positioning equipment of the present utility model can accurately be determined position and the stroke of drive disk assembly to be positioned.Further, all export an additional pulse signal due to scrambler when code-disc often turns around, therefore can determine exactly the number of turns that code-disc turns, thereby can not produce cumulative errors.

The accompanying drawing explanation

In order to understand better content of the present utility model, drawn the following drawings.Should be understood that, accompanying drawing is only that the form with example shows principle of the present utility model, and should not be taken as, is the restriction to scope of the present utility model.Wherein:

Fig. 1 schematically shows scrambler positioning equipment of the present utility model;

Fig. 2 shows the inner structure of the scrambler in the scrambler positioning equipment of Fig. 1;

Fig. 3 shows the counting principle of the scrambler of Fig. 2;

Fig. 4 a shows the treatment circuit of the signal processing unit in the scrambler positioning equipment of Fig. 1, and Fig. 4 b and Fig. 4 c show respectively that code-disc when scrambler turns clockwise and the input end of the d type flip flop of the treatment circuit in Fig. 4 a and the waveform of output terminal while being rotated counterclockwise.

Embodiment

As shown in Figure 1, scrambler positioning equipment of the present utility model comprises scrambler 10, signal processing unit 20.Signal processing unit 20 connects power supply 30 and is connected with scrambler 10 with the COM line by power lead; Wherein an end of COM line connects the COM port of scrambler 10, and the other end connects the COM port of signal processing unit 20 and the negative pole of power supply 30.In addition, the input end of signal processing unit 20 is connected with the output terminal of scrambler 10 with signal wire B by signal wire A.The input end of scrambler 10 is connected with drive disk assembly (not shown) to be positioned.In the utility model, scrambler 10 is increment of rotation formula scrambler.

Fig. 2 shows the inner structure of scrambler 10 of the present utility model.As shown in Figure 2, scrambler 10 comprises light source 11, lens 12, code-disc 13, light activated element 14 and amplification and rectification circuit 15.The light that light source 11 sends is radiated on code-disc 13 after lens 12 are assembled.Code-disc 13 is around the rotating shaft rotation at its center.Carve transmission region and the light tight zone (in more detail as shown in Figure 3) of each interval along the angle of code-disc 13, the light of the described transmission region of process can be received by light activated element 14.Light activated element 14 is converted to electric signal by the light signal received, and this electric signal obtains the output waveform of digit pulse form through amplification and rectification circuit 15.

The principle of work of scrambler is described below with reference to Fig. 3.As shown in Figure 3, the angular width of the light transmission part on code-disc 13 is S0, and the angular width of lightproof part is S1.Light activated element 14 in Fig. 2 is preferably the form of two photoreceivers, and the distance between these two photoreceivers is S2.For the purpose of being described clearly, these two photoreceivers are shown in Figure 3 for and are positioned at A, B 2 points, and the code-disc 13 that can not be rotated blocks.Below take and be positioned at photoreceiver that A orders and discuss as example, yet be understandable that, the discussion of doing is applicable equally to the photoreceiver that is positioned at B and orders.

As mentioned above, the input end of scrambler 10 is connected with drive disk assembly to be positioned.Along with drive disk assembly generation straight-line displacement or angular displacement to be positioned, code-disc 13 rotates, and is positioned at photoreceiver that A orders and can periodically by the lightproof part of code-disc 13, be blocked or see through the light transmission part of code-disc 13 and expose.When being positioned at photoreceiver that A orders and being blocked by the lightproof part of code-disc 13, this photoreceiver can not receive the light that light source 11 sends, and correspondingly, the output waveform of amplification and rectification circuit 15 is low level " 0 ".When being positioned at that photoreceiver that A orders sees through the light transmission part of code-disc 13 and while exposing, this photoreceiver can receive the light that light source 11 sends, correspondingly, the output waveform of amplification and rectification circuit 15 is high level " 1 ".Because the angular width of light transmission part is S0, the angular width of lightproof part is S1, distance between two photoreceivers be S2, thus the phase differential between the output waveform of the photoreceiver of 2 of above-mentioned high level and low level duration and A, B all with S0, S1 and S2 between ratio relevant.The waveform of electric signal after amplifying shaping of the photoreceiver output that A, B are 2 is shown in Figure 3 equally.In fact, the ratio between the duration of described low level duration, described high level and described phase differential three equals the ratio between S0, S1 and S2.Be appreciated that when the code-disc 13 shown in Fig. 3 right side turns clockwise, it is to the right positive dirction that the transverse axis (time shaft) of the oscillogram shown in Fig. 3 left side be take, and when code-disc 13 is rotated counterclockwise, it is left positive dirction that the transverse axis of oscillogram be take.

Table 1 shows when code-disc 13 turns clockwise or is rotated counterclockwise, the level value of electric signal after amplifying shaping of the photoreceiver output that A, B are 2.Can find out, by comparing current time and next level value constantly, can judge that code-disc 13 turns clockwise or is rotated counterclockwise.It is pointed out that to be preferred embodiment, wherein a S0=S1=2 * S2 of the present utility model shown in table 1.

Table 1

In a preferred embodiment, scrambler 10 is except the digit pulse waveform of electric signal after amplifying shaping of the photoreceiver output of 2 of output A, B, also along with code-disc 13, often turn around and export an extra-pulse, the location of the reference point rotated for code-disc 13, thus can know the number of turns that code-disc 13 rotates.By the sense of rotation of understanding code-disc 13 and the number of turns of code-disc 13 rotations, can know the motion conditions of drive disk assembly to be positioned and make measurement and positioning not there will be cumulative errors.

Principle of work below in conjunction with the treatment circuit in Fig. 4 a, Fig. 4 b and Fig. 4 c explanation signal processing unit 20.

As shown in Fig. 4 a, two input ends of the d type flip flop of described treatment circuit receive respectively the output electrical signals of the photoreceiver that photoreceiver that A orders and B order through amplifying the waveform (OUT-A and OUT-B) of shaping, and OUT-L is above-mentioned extra-pulse.When code-disc 13 turns clockwise, as shown in Figure 4 b, the leading output waveform OUT-B90 ° of output waveform OUT-A, the output terminal Q output high level (waveform W1) of d type flip flop, and output terminal

Output low level (waveform W2), the Sheffer stroke gate of the top shown in described treatment circuit is opened, what count pulse (waveform W3) was delivered to bi-directional counter 74LS193 by this Sheffer stroke gate adds pulse input end CU, and code-disc 13 often turns around clockwise and carries out plus coujnt one time; Simultaneously, the Sheffer stroke gate of the below shown in described treatment circuit is closed, this Sheffer stroke gate output high level (waveform W4).When code-disc 13 is rotated counterclockwise, as shown in Fig. 4 c, output waveform OUT-A falls behind output waveform OUT-B90 °, the output terminal Q output low level (waveform W1) of d type flip flop, output terminal

Output high level (waveform W2), the Sheffer stroke gate of described top is closed, and it exports high level (waveform W3); Simultaneously, the Sheffer stroke gate of described below is opened, and count pulse (waveform W4) is delivered to the subtract pulse input end CD of bi-directional counter 74LS193 by this Sheffer stroke gate, and code-disc 13 often turns around counterclockwise and carries out the subtraction counting one time.

The bi-directional counter 74LS193 that treatment circuit shown in Fig. 4 a comprises three cascades, thus 12 (D0 to D12 in Fig. 4 a) binary counters can be formed.It will be apparent to one skilled in the art that described treatment circuit can also comprise more or less bi-directional counter as required, and model is not limited to 74LS193.

Scope of the present utility model is not limited in above-described content.Those skilled in the art can carry out various deformation and modification to above-described embodiment under the prerequisite that does not break away from the utility model technical conceive, and these distortion and revise to work as and belong in scope of the present utility model.

Claims

1. a scrambler positioning equipment, it is characterized in that, comprise scrambler and signal processing unit, the input end of described scrambler is for being connected with drive disk assembly to be positioned, described signal processing unit external power supply, described scrambler is connected with the COM line by power lead with described signal processing unit, and the output terminal of described scrambler is connected by signal wire with the input end of described signal processing unit;

Described scrambler comprises light source, lens, code-disc, light activated element, amplification and rectification circuit, the light that described light source sends arrives described code-disc after lens are assembled, described code-disc is carved with transmission region and the light tight zone of each interval along angle, along with described drive disk assembly generation straight-line displacement or angular displacement to be positioned, described code-disc can be around the axis rotation of himself, in the rotary course of described code-disc, the light of assembling through lens is received by described light activated element or is blocked and can not be received by described light activated element by described light tight zone through described transmission region, described light activated element is converted to electric signal by the light signal of reception, described electric signal forms digit pulse and inputs described signal processing unit via described signal wire after being processed by described amplification and rectification circuit, described signal processing unit is processed described digit pulse.

2. scrambler positioning equipment according to claim 1, wherein said scrambler has two output terminals, described signal processing unit has two input ends, described two output terminals are connected by two signal wires with described two input ends, and described light activated element is two photoreceivers, each photoreceiver all is converted to electric signal by the light signal of its reception, described electric signal forms digit pulse and inputs two input ends of described signal processing unit through described two signal wires by described two output terminals after being processed by described amplification and rectification circuit.

3. scrambler positioning equipment according to claim 2, wherein said scrambler also has an additional output terminal, described signal processing unit also has an additional input end, described additional output terminal often revolves at described code-disc the extra-pulse of time output that turns around, and this extra-pulse is transfused to described additional input end.

4. scrambler positioning equipment according to claim 3, wherein said signal processing unit comprises d type flip flop, the first Sheffer stroke gate, the bi-directional counter of the second Sheffer stroke gate and a plurality of cascades, two input ends of described d type flip flop receive described digit pulse, the output signal of each in two output terminals of described d type flip flop forms respectively the input signal of the first Sheffer stroke gate and the second Sheffer stroke gate with described extra-pulse, the output terminal of described the first Sheffer stroke gate and the second Sheffer stroke gate be connected to respectively in the bi-directional counter of described a plurality of cascades first add pulse input end and subtract pulse input end.

5. according to claim 2,3 or 4 described scrambler positioning equipments, the angular width in wherein said transmission region and described light tight zone equates, and the distance between described two photoreceivers equals described angular width half.