CN100359291C

CN100359291C - Absolute type single-ring eccentric code channel encoder

Info

Publication number: CN100359291C
Application number: CNB200410011134XA
Authority: CN
Inventors: 于萍
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2004-09-27
Filing date: 2004-09-27
Publication date: 2008-01-02
Anticipated expiration: 2024-09-27
Also published as: CN1731100A

Abstract

The present invention relates to an absolute type single-ring eccentric code channel coding disk which belongs to the technical field of photoelectric measurement, particularly to a coding disk. The present invention solves the technical problem of providing an absolute type single-ring eccentric code channel coding disk. The present invention comprises a code disk and a slit disk, wherein the code disk and the slit disk are arranged coaxially, the code disk is fixedly connected with a main axle and can rotate with the main axle, and the slit disk can rotate correspondingly to the code disk. A code channel on the code disk is an eccentrically designed light through area between two circles, and is a single-ring eccentric code channel. Four slits which are uniformly distributed in 90 DEG are arranged on the slit disk, and the positions of the four slits correspond to the single-ring code channel on the code disk. The coding disk can output multidigit absolute codes. Since the single-ring light through area is adopted, the size of the code disk can be reduced as small as possible to provide conditions for developing subminiature absolute coders.

Description

The eccentric code channel code-wheel of a kind of absolute type individual pen

Technical field

The invention belongs to the eccentric code channel code-wheel of a kind of absolute type individual pen that relates in the photoelectric measurement technical field.

Technical background

Optical electric axial angle encoder is the representative photoelectricity angle measurement device of measured angular displacement, and the core parts of optical electric axial angle encoder are optical encoding disks, and it is that mutual coupling by code-disc and slit plate forms.

The prior art the most approaching with the present invention is the patent of Changchun Institute of Optics, Fine Mechanics and Physics, CAS, and patent name is: absolute type matrix coding disk, the patent No. is: ZL00264312.X, Granted publication day is September 26 calendar year 2001.As depicted in figs. 1 and 2, Fig. 1 is a code-disc, comprises code-disc substrate 1,2,180 °～360 ° light district code channels 3 of code-disc center pit.Fig. 2 is a slit plate, comprise: slit plate substrate 4, slit plate center pit 5,

slit

6,7,8,9,10,11 and 12, slit 6 are positioned at 90 °, slit 7 and are positioned at 135 °, slit 8 and are positioned at 180 °, slit 9 and are positioned at 202.5 °, slit 10 and are positioned at 247.5 °, slit 11 and are positioned at 292.5 °, slit 12 and are positioned at 337.5 °, slit 13 and are positioned at 0 °, slit 14 and are positioned at 45 °.

The coaxial installation of code-disc and slit plate, the radius at each slit place equate that with the transparent zone radius of code-disc when code-disc swayed, when transparent zone turned to each slit location, the reception light pipe that is installed in slit one side can both receive light energy signal.The angle value that on behalf of the scrambler main shaft of slit location, this light energy signal rotate.

The subject matter that this code-wheel exists is: only can export four basic codes, complex structure if will increase the output figure place, must increase the number of turns of delineation, so just can not accomplish to reduce volume.Therefore, the scrambler of making of this code-wheel can not be realized subminiaturization.

Summary of the invention

In order to overcome the defective that prior art exists, the objective of the invention is to delineate the individual pen code channel, output multidigit basic code dwindles the code-disc size, and simplified structure is for the subminiaturization absolute type encoder provides code-wheel.

The technical problem to be solved in the present invention is: provide a kind of absolute type individual pen eccentric code channel code-wheel.The technical scheme of technical solution problem as shown in Figure 3 and Figure 4, Fig. 3 is a code-disc, comprises code-disc substrate 15, eccentric code channel 16, code-disc center pit 17; Fig. 4 is a slit plate, comprises slit plate substrate 18, slit plate center pit 19, first slit 20, second slit 21, the 3rd slit 22 and the 4th slit 23;

Code channel in the code-disc substrate 15 shown in Figure 3 is the transparent zone between eccentric two circles that design, and is individual pen code channel delineation district, is the eccentric code channel 16 of individual pen, and code disk shaft center pit 17 is positioned at the center of code-disc substrate 15;

In the slit plate substrate 18 shown in Figure 4, on orthogonal two diameters, getting radius exists together mutually, four slits i.e. first slit 20, second slit 21, the 3rd slit 22 and the 4th slit 23 are set, slit 23 is positioned at 0 ° of position, second slit 21 is positioned at 180 ° of positions, and first slit 20 is positioned at 90 ° of positions, and the 3rd slit 22 is positioned at 270 ° of positions; Code-disc and slit plate coaxial cable are installed, code-disc and scrambler main shaft are connected, and rotate with main shaft, slit plate and code-disc relatively rotate, four slits, first slit 20, second slit 21, the 3rd slit 22 and the 4th slit 23 that are positioned at the 90 ° of distributions of being separated by that radius exists together mutually on the slit plate are corresponding with the position of the eccentric code channel 16 of individual pen on the code-disc.

The principle of work explanation:

Scrambler main shaft, axle sleeve, bearing are formed scrambler axle system, and code-disc links to each other with the scrambler main shaft, and with scrambler main shaft coaxial rotation, slit plate and axle sleeve are fixed, and at code-disc and slit plate both sides luminotron and receiving tube are installed.When main shaft drives the code-disc rotation, the light that luminotron sends is received the pipe reception through code-disc and slit plate, because the code-disc transparent zone is eccentric logical light belt, so the luminous energy that receiving tube receives is a size variation, same receiving tube for same position, when main shaft rotates in rotating, the change curve of the luminous energy that it obtains is identical, want to tell the absolute angle that main shaft turns over, must four groups of luminotrons and receiving tube be set in orthogonal four positions, can obtain four curves as shown in Figure 5 like this.Wherein curve I and III, II and IV amplify through the amplifier difference, obtain curve as shown in Figure 6.From these two curves as can be seen: these two curves are in that arbitrarily the axis angular position signal amplitude is all inequality, this two paths of signals combine can the output coder shaft angle the absolute angle value.This two paths of signals can obtain multidigit scale-of-two basic code by the electronics segmentation.

Good effect of the present invention: the eccentric code channel code-wheel of absolute type individual pen, exportable multidigit basic code owing to adopt the individual pen transparent zone, can make code-disc minification as much as possible, for making the microminiature absolute type encoder, provides the reliable coding dish.

Description of drawings

Fig. 1 is the structural representation of code-disc in the prior art, Fig. 2 is the structural representation of slit plate in the prior art, Fig. 3 is the structural representation of code-disc of the present invention, Fig. 4 is the structural representation of the slit plate among the present invention, when Fig. 5 is main shaft rotating of the present invention rotation, the change curve of four position luminous energies.Fig. 6 is the change curve of the luminous energy that obtains after the amplifier difference.

Embodiment

The present invention presses Fig. 3 and structure shown in Figure 4 is implemented, the material of code-disc substrate 15, slit plate substrate 18 all adopts K9 optical glass, chrome-faced, the distance that forms between the center of circle of two off-centre operations of eccentric code channel 16 is 0.5mm, the maximum transparent zone of eccentric code channel 16 and the stand out of minimum transparent zone are 1mm, the width of minimum transparent zone can not be 0, select 0.5mm, four slits on the slit plate i.e. width of first slit 20, second slit 21, the 3rd slit 22 and the 4th slit 23 are selected 0.05mm, and length is 2.5mm.

Claims

1. the eccentric code channel code-wheel of an absolute type individual pen, comprise code-disc and slit plate, both coaxial cables are installed, code-disc and main shaft are connected and rotate with main shaft, it is characterized in that code-disc comprises code-disc substrate (15), eccentric code channel (16), code-disc center pit (17), slit plate comprises slit plate substrate (18), slit plate center pit (19), first slit (20), second slit (21), the 3rd slit (22) and the 4th slit (23); Code channel in the code-disc substrate (15) is the transparent zone between eccentric two circles that design, and is the eccentric code channel (16) of individual pen, and code-disc center pit (17) is positioned at the center of code-disc substrate (15); In slit plate substrate (18), on orthogonal two diameters, get radius and equate the place, be provided with four slits i.e. first slit (20), second slit (21), the 3rd slit (22) and the 4th slit (23), slit separation be 90 ° uniform, the 4th slit (23) is positioned at 0 ° of position, first slit (20) is positioned at 90 ° of positions, second slit (21) is positioned at 180 ° of positions, the 3rd slit (22) is positioned at 270 ° of positions, and the position of the eccentric code channel of the individual pen on the position of four slits and the code-disc (16) is corresponding.