CN2113467U - Photoelectric sensor for measuring length and distinguishing positive and reversal turn - Google Patents

Abstract

The utility model provides a photoelectric sensor for measuring length and distinguishing a positive and a reversal turn, comprising a light source, two photoelectric elements and a blanking disc. The blanking disc is arranged between the light source and the photoelectric element. The photoelectric sensor for measuring length and distinguishing the positive and the reversal turns is characterized in that the two photoelectric elements are used; the blanking disc is bored with a plurality of clear apertures; the relative geometric position of an effective working region between each of the photoelectric element and the corresponding clear apertures is different; when the blanking disc rotates, the total amount of photoimpact output by the photoelectric elements and the variation of relative phases are used to measure the length and distinguish the positive and the reversal turns.

Description

Photoelectric sensor for measuring length and distinguishing positive and reversal turn

The utility model belongs to the photoelectric sensor with linear measure longimetry and rotating discrimination function.

Existing photoelectric sensor, usually be with light source by the light hole on the disk, by photovalve output photoimpact, testee is wound in the rotating shaft of rotary disk, according to the quantity that adds up of output photoimpact, can determine the length of measured object.It is less to have light hole on the rotating disk of this sensor, generally opens a hole 1/4-1 week, and photovalve only uses one, if when reversing, the counter-rotating sensing element that is loaded on the rotating disk will rotate longer distance, inverting signal just occurs, uses sensitivity lower.

The purpose of this utility model is to design a kind of have the survey length of higher sensitivity and the photoelectric sensor of rotating discrimination function.

This sensor is made up of the blanking disc and the photovalve of light source, perforate, and blanking disc is characterized in that said photovalve has two at least between light source and photovalve, have two light holes on the blanking disc at least; Effectively the relative geometry position between the workspace is inequality separately for the corresponding light hole with it of each photovalve.

Because the unthreaded hole of opening on the disk is more, the electrical impulse frequency of input photovalve uprises, and can discern the long distance of survey and dwindle, and makes and surveys long sensitivity raising.During counter-rotating, because two photovalves are set, the relative geometry position of two its corresponding light holes of photovalve is inequality, relatively imports leading, the hysteresis of two photovalve signal phase places, can effectively differentiate rotating, and save the special-purpose sensing element of inverting signal; Because the light hole on the blanking disc is more, make the time of differentiating rotating fast, highly sensitive.

Fig. 1 is a schematic side view of the present utility model;

Fig. 2 is the synoptic diagram of photovalve and blanking disc in the utility model, and as Figure of abstract.

Provide embodiment below in conjunction with accompanying drawing.

See Fig. 1,1 is optocoupler components, and 2 is the light emitter, and 3 is the light-receiving utmost point, and 4 is blanking disc, and 5 is light hole.When emitter 2 emission infrared lights, through light hole 5, received output electric signal by photoelectricity receiving pole 3.

Seeing Fig. 2, two photovalve A, B are arranged in the present embodiment, can be photoelectricity coupling element or Hall element.Have 10 light holes on the blanking disc.The quantity of above-mentioned photovalve and light hole can require to change with measurement sensitivity, but the relative geometry position between effective workspace of each photovalve and its corresponding light hole must be inequality, between photovalve, causing the lag or lead of signal phase place, thereby differentiate rotating.As Fig. 2, between effective separately workspace of its corresponding light hole 7 of B element, both coincide at the diametric center line of blanking disc; Between effective workspace of the light hole 6 that A element and its are answered, both have certain deviation at the diametric center line of blanking disc, and the relative geometry position that reaches between A element and the light hole 6 between B element and the light hole 7 is inequality.When blanking disc was rotated in the forward, the B element was ahead of A element conductive electric pulse; During reverse rotation in contrast.But that utilizes the rotating output electric pulse adds, subtracts the total amount measured length; Utilize the leading of electric pulse or lag behind and end (conducting), can differentiate the forward and backward state.Also desirable other states in position among Fig. 2 between photovalve A, B and hole 6, the hole 7 are as long as satisfy relative geometry position condition inequality between effective workspace.The shape of said light hole and distribution also can change, as long as satisfy above-mentioned condition inequality.

The output signal of this photoelectric sensor can adopt different Circuits System to handle, and for example adopts computer to handle.

Claims (2)

1, survey long and rotating differentiation photoelectric sensor, be made up of the blanking disc and the photovalve of light source, perforate, blanking disc is characterized in that said photovalve has two at least between light source and photovalve, have two light holes on the blanking disc at least; Effectively the relative geometry position between the workspace is inequality separately for the corresponding light hole with it of each photovalve.

2, by the said photoelectric sensor of claim 1, it is characterized in that said photovalve has two, have 10 light holes on the blanking disc.

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