CN2679766Y - Photoelectric counter having laser light source - Google Patents

Abstract

The utility model relates to a photoelectric counter having laser light source using semiconductor point-source laser transmitter as a counting illuminating source to connect with an impulse-forming circuit and a counting system circuit by photo and electricity. The utility model uses a count pulse formed by the fact whether the occlusion to a laser beam transmitting from an illuminating source is realized or not to process collection, and transmits the collected signal into a counting system composed by SCM to process to show output value and overflow signal; the counting illuminating source is installed on corresponding position of a direct projection light sensitive diode; the illuminating source and the light sensitive diode are disposed at both sides of a counting object respectively; a laser flare is positioned onto light-accepting side of the light sensitive diode. The utility model has advantages of novel structure, simple operation, reliable performance of electrical principle, high stability, accurate counting direction, high anti-interference capability, more accurate counting and broad counting objects scope, and the utility model is applicable for count situations of commercial manufacture real-time monitoring, monitoring and some other large volume firmwares extensively.

Description

LASER Light Source photoelectric counting device

Technical field:

The utility model relates to the photoelectric counting device that a kind of counting light source that is formed by semiconductor point light source generating laser and pulse shaping circuit and single-chip microcomputer number system constitute, this device is gathered by the laser beam of light emitted being blocked with the count pulse of denying formation, the signal collected single-chip microcomputer number system that is input to is handled, export count value and spill over after disposing, can be widely used in the counting occasion of large volume firmwares such as commercial production monitoring in real time.

Technical background:

Usually, the photoelectric counting device is to adopt photoelectric coupled device, the device that utilizes the optoelectronic induction principle to count.Existing photoelectric counting device mainly contains two big classes, one class is the infrared induction counting assembly, it mainly adopts infrared transmitting tube as light source, the radiation of common infrared transmitting tube emissive power within limits, its divergence is big, use the counting assembly counting region of this light source and disperse, be not suitable for carrying out the accurate counting of single direction; Second class is a photoelectricity correlation counting assembly, its photoelectric correlated cell that mainly adopts intrinsic packing forms is as sensing element, and the slit of photoelectric correlated cell only allows to pass through less than the firmware of slit, so just can not count large-scale firmware, has greatly limited the scope of counting object.End is got up, existing photoelectricity class firmware counting assembly ubiquity counting region disperse, count slit narrow, be not suitable for shortcoming such as bulky firmware counting.

Summary of the invention:

The purpose of this utility model be to overcome counting region that existing counting assembly exists disperse, count slit narrow, be not suitable for shortcoming such as bulky firmware counting, seek to design a kind of with semiconductor point light source generating laser as light source, with the single-chip microcomputer is that core is formed number system, adopt light source and number system discrete design, the unrestricted novel counting assembly of counting slit.

In order to realize the foregoing invention purpose, the photoelectric counting device that the utility model constitutes mainly is communicated with and is formed by counting light source, pulse shaping circuit, number system (containing counting demonstration, spill over) three part photoelectricity; The counting light source is selected semiconductor point light source generating laser for use, cooperates with pulse shaping circuit to produce counting pulse signal; Pulse shaping circuit mainly is made up of photodiode D5, triode T1, diode D6, resistance R 15, R16 and relay J 1 electric connection, the counting light source is installed in direct projection photodiode D5 corresponding position, light source and photodiode place counting thing passage both sides respectively, and laser facula is positioned the sensitive surface of photodiode; The tie point of photodiode D5 and resistance R 16 connects the base stage of T1, the emitter of T1 connects another utmost point of R16 and ground connection, the collector of T1 connects the positive pole of diode D6 and an end of relay J 1, another termination of J1 D6 negative pole and R15 tie point, corresponding with the number system circuit respectively point of other end points of J1 is communicated with, and realizes the conveying of pulse signal.Its principle of work: photodiode D5 ends under the normal state, is high-impedance state, so the base bias voltage of triode T1 (9013) is almost equal to zero, and T1 ends, and relay J 1 discharges, relay J 1 normally closed termination high level, Vout end output high level.When laser radiation is last to photodiode D5, photodiode D5 conducting, the base stage of T1 has bias voltage to add, the T1 conducting, relay J 1 adhesive, relay J 1 contact ground connection, Vout holds output low level, this circuit utilizes light to be blocked (the counting thing is arranged) by (not counting thing) and light and produces high-low level, forms count pulse; Number system adopts singlechip chip AT89C51 electrical principles routinely that the device electric connection is formed, and its function comprises that count value shows, overflow alarm, and spill over output is overflowed initial value and is selected, and control resets.

The utility model is compared with existing counting assembly, has novel structure, and easy and simple to handle, circuit is simple, and stability is high, and counting direction is accurate, and antijamming capability is strong, and it is more accurate to count, the outstanding advantage of the counting wider grade of object range.The employing LASER Light Source is as the counting light source, and laser is extremely pure, the high electromagnetic wave of a kind of frequency in essence, its good directionality, the concentration of energy of irradiation and reflection, so the effectively driving pulse formation circuit formation pulse of this light source; Light source and number system discrete design, and the application of LASER Light Source can increase the slit of number system, in order to carry out the counting of large volume firmware; This counting assembly is to utilize light not to be blocked (light source and the sensing element discrete design) that (the counting thing is arranged) counts by (counting thing) and light, so the maximum characteristics of native system are not have error.The utility model has the prospect of applying in fields such as commercial production, real-time monitoring and automatic controls, and especially the counting for the product number has wide application space in the product production line production run.

Description of drawings:

Fig. 1 is the pulse shaping circuit principle assumption diagram of the utility model.

Fig. 2 is the number system circuit principle structure figure of the utility model.

Specific embodiments:

The utility model will be counted light source 1, pulse shaping circuit and number system circuit and be communicated with and form a single unit system by electrical principles photoelectricity, the number system circuit adopts conventional schematic circuit to form, wherein IC1 is single chip computer AT 89C51, LM7805 is a direct current conversion voltage stabilizing chip (12V ∽ 5V), R1-R8 and P1 mouth resistance are 560 Ω, R9-R12 and R14 are 1K Ω, and R13 is 750 Ω; R15 is 390 Ω, and R16 is 47K, and crystal oscillator is 12MHz, and hummer is a 5V electromagnetic type hummer; In pulse shaping circuit, D5 is a photodiode, and T1 is 9013 type triodes, and D6 is an IN4001 type diode, and J1 is the conventional DC electromagnetic relay.

When the utility model is implemented, its counting light source 1 adopts semiconductor point light source generating laser, adoptable specification is as follows: emission light is that wavelength is 650nm, hot spot is point-like (r＜2mm), the red laser bundle of luminous power P＜3mW, its laser beam emitting head operating voltage: DC3V, working current:＜30mA (can select pointolite laser instrument LH-D6503DL for use); Pulse shaping part and number system portion made the single face pcb board, again primary element is welded up and get final product, Vout end, Vcc end, the GND end of pulse shaping part are connected with Vin end, Vcc end, the GND end of single-chip microcomputer number system part respectively, and power supply adopts common 220VAC ∽ 12VDC d-c transformer power supply; The photodiode of pulse shaping part should be selected dark colloid packing forms for use, so that filtering interfering light, perhaps places photodiode darkroom (its sensitive surface exposes) to the influence of number system, to improve its susceptibility to laser; The relay that is adopted all can be selected the conventional DC electromagnetic relay for use, operating voltage 12V, maximum operating currenbt 10A; Display screen adopts the conventional charactron of two one.

The work that this device application software need be finished has: detect pulse, pulse count shows count results, the default initial value that overflows, and relatively umber of pulse and default initial value produce spill over.Can carry out programmed according to conventional method, and the machine code after technology will compile routinely is cured in the storer of AT89C51.

Use of the present utility model: at first the DIP switch S3 by the single-chip microcomputer number system sets the prefabricated number that overflows, and can overflow numerical value by prefabricated 8 of software design, selects by DIP switch; LASER Light Source and pulse shaping part are placed the both sides of counting the thing passage respectively, and laser facula is positioned the sensitive surface of photodiode; Make system reset by pressing reset button S2; When the counting thing passed through number system, laser was blocked, and formed count pulse, and Single Chip Microcomputer (SCM) system detects pulse, and showed count value; When count value surpasses when overflowing preset value, system produces spill over, comprises LED flash, hummer sounding, relay closes; If touch reset switch S2, system will reset, the current count value zero clearing in counting process.

Claims (1)

1, a kind of LASER Light Source photoelectric counting device is characterized in that counting light source, pulse shaping circuit and number system photoelectricity are communicated with composition; The counting light source is a semiconductor point light source generating laser; The counting light source is installed in direct projection photodiode corresponding position, and light source and photodiode place counting thing passage both sides respectively, and laser facula is positioned the sensitive surface of photodiode; The tie point of photodiode D5 and resistance R 16 connects the base stage of T1, the emitter of T1 connects another utmost point of R16 and ground connection, the collector of T1 connects the positive pole of diode D6 and an end of relay J 1, corresponding with the number system circuit respectively point of another termination D6 of J1 and R15 tie point, other end points of J1 is communicated with.

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