CN2320984Y

CN2320984Y - Circular grating coder with image area code

Info

Publication number: CN2320984Y
Application number: CN 97243015
Authority: CN
Inventors: 徐之材; 姚骑均
Original assignee: Purple Mountain Observatory of CAS
Current assignee: Purple Mountain Observatory of CAS
Priority date: 1997-12-05
Filing date: 1997-12-05
Publication date: 1999-05-26
Anticipated expiration: 2007-12-05

Abstract

The utility model relates to a circular grating coder with image area code. The utility model is provided with the counting grating ring and the zero position light slit of the circular grating coder. The utility model is characterized in that the utility model is additionally provided with a set of image area rings, the light-transmitting area and the light-shielding area of the image area ring are arranged according to the position of an image-limiting area, and the utility model is additionally provided with a photosensor and a back stage circuit which are corresponding to the image area ring. After the utility model works, the image area signal of the initial position of a rotary axis can be obtained, and the optimal turning direction and the optimal rotating angle which are used for searching the zero point can be judged; thereby, the utility model avoids the problem in prior art that the over-limit angle area is unable to be entered if the search of the zero point is unable to be directly solved, and the problem and the expense which are caused by the additional equipment can be avoided.

Description

Disk light beam encoder with image area code

The utility model relates to a kind of disk light beam encoder with image area code.

Be equipped with a ring on the disk light beam encoder of the prior art, be carved with grating above, in order to obtain count pulse (can be described as counting grating ring or first ring).Simultaneously, outside this ring, also be provided with a light slit (can be described as zero-bit light slit or second ring) that obtains the zero position pulse, in order to the output zero signal.After the zero point of having determined scrambler, this rotary angle transmitter is promptly measured the entering angle position measurement by angular displacement.So, when using disk light beam encoder, at first need search zero point for the equipment of need mensuration position, angle.But existing various disk light beam encoder when zero point is searched in start, can't obtain to search the basis for estimation that zero point, the best turned to from scrambler.For the limited equipment of angle range, this problem is very outstanding.In order when searching zero point, not enter in the angular regions that transfinites, can only set up optional equipment, as limit switch or angle measuring potentiometer etc.

In order to overcome the above-mentioned defective of prior art, the utility model will provide a kind of disk light beam encoder with image area code, this new scrambler can also provide the signal that resembles the position of living at zero point when zero signal is provided, be beneficial to judge that the best of searching zero point turns to and corner.

The scheme that realizes this goal of the invention is as follows: on the basis of existing disk light beam encoder counting grating ring and zero-bit light slit, set up one group and resemble district's ring, the photic zone that resembles district ring is provided with the position of light-blocking region by the quadrant district, simultaneously, sets up and resembles the district and encircle corresponding photosensitive device and late-class circuit.In addition, vernier light grating need be carved into an elongate strip light slit for measuring the zero-bit light slit and resembling district's ring position coded signal.Said " one group resembles district's ring " can be a ring, two rings or more ring.Said " photic zone and light-blocking region are provided with by the position in quadrant district " is meant: each ring can adopt the semi-ring printing opacity, and the figure that semi-ring is in the light adopts two and resembles Qu Huanshi, and the photic zone of two rings differs 90 °.Press different needs, resemble district ring also can adopt by 90 ° at interval printing opacities, be in the light, or other resemble differentiation every method, for example be 120 ° equipment for angle range, third ring should adopt the printing opacity segment angle to be ± 120 °, the segment angle that is in the light is ± 60 °.This group resembles Qu Huanye and can be described as third ring.The photosensitive device of setting up, the principle of late-class circuit and structure are identical with first ring or the original photosensitive device of second ring, late-class circuit.

The scrambler that the utility model provides has adopted sets up the structure that resembles district's ring, what can obtain the initial position of rotating shaft after the start resembles district's signal, promptly when obtaining zero signal, just learn the position that resembles of living at zero point, judge the best of searching zero point according to this and turn to and corner.Avoid original technology can't directly solve the problem that does not enter the angular regions that transfinites when searching zero point, avoided setting up problem and the expense that optional equipment causes.

Now be described further with embodiment in conjunction with the accompanying drawings.

Fig. 1 is embodiment 1 a circle compact disk structure synoptic diagram;

Fig. 2 is late-class circuit figure in the example 1.

Embodiment 1, with reference to Fig. 1: have the disk light beam encoder of image area code, be provided with counting grating ring, be first ring 1 and zero-bit light slit, it is characterized in that: also be provided with two and resemble district's ring: second ring 2, third ring 3, each ring adopts the semi-ring printing opacity, the figure that semi-ring is in the light, two photic zones that resemble district's ring differ 90 °.Simultaneously, also be provided with and resemble the district and encircle corresponding photosensitive device and late-class circuit.With reference to Fig. 2: when the circle CD is positioned at II, during the III zone, the third ring output low level makes the second ring in II, the pulse that III Xiang Qu edge produces can not be passed through Sheffer stroke gate U1A, U1C produces the pulse at zero point, have only the circle of working as CD to be in I, when IV resembles the district, the third ring output high level allows the second ring signal to pass through Sheffer stroke gate, at this moment, when circle CD during from the motion of I → IV, the second ring produces the positive transition pulse, through C1, produce a burst pulse behind the D1 differential, through U1A, U1D output pulse signal at zero point, in like manner, when circle CD during from the motion of IV → I, the second ring produces negative saltus step pulse, and this signal is through oppositely back one-tenth positive transition of Sheffer stroke gate U1B, through C2, behind the D2 differential, by Sheffer stroke gate U1C, U1D output pulse signal at zero point.In addition, the vernier grating is carved into an elongate strip light slit for measuring the zero-bit light slit and resembling district's ring position coded signal.After the start, the district of the second ring and third position code of encircling resemble to(for) four of I II III IV are respectively 01,00,10 and 11.Saltus step and following saltus step for solving its monambiguity, need the position signalling by third ring all as zero cross signal on the level of the position signalling that the second ring provides, and the third ring position signal is 1 o'clock, and the skip signal of second ring is just effective.

Embodiment 2, and is basic identical with last routine structure, but third ring is last except that resembling district figure, also is carved with the light slit at zero point.

Claims

1, a kind of disk light beam encoder with image area code, be provided with disk light beam encoder counting grating ring and zero-bit light slit, it is characterized in that: set up one group and resemble district's ring, resemble the photic zone and the position setting of light-blocking region of district's ring by the quadrant district, simultaneously, set up and resemble the district and encircle corresponding photosensitive device and late-class circuit.

2, according to the described disk light beam encoder with image area code of claim 1, it is characterized in that: the vernier grating is scribed into an elongate strip light slit for measuring the zero-bit light slit and resembling district's ring position coded signal.

3, according to claim 1 or 2 described disk light beam encoders with image area code, it is characterized in that: resembling district's ring has two rings, and each ring adopts the semi-ring printing opacity, the figure that semi-ring is in the light, and the photic zone of two rings differs 90 °.

4, according to claim 1 or 2 described disk light beam encoders, it is characterized in that: resemble district's ring and adopt by 90 ° of interval printing opacities, be in the light with image area code.

5, according to claim 1 or 2 described disk light beam encoders with image area code, it is characterized in that: the printing opacity segment angle that resembles district's ring is ± 120 °, and the segment angle that is in the light is ± 60 °.