CN110609333A - Parallel light source grating device - Google Patents

Abstract

The invention discloses a parallel light source grating device, which comprises a plurality of light emitters for providing light sources, a plurality of light receivers corresponding to the light emitters and capable of receiving light, and a plurality of lenses arranged between the light emitters and the light receivers; wherein the lens adjusts the light source of the light emitter from general scattered light to parallel light, and emits the light toward the light receivers, and a plurality of parallel lights form a light curtain, and the spacing between the light receivers is smaller than the cross-sectional size of an object; when the object falls and passes through the light curtain, part of the parallel light will be shielded, and at this time, part of the light receivers will not receive the parallel light at the moment when the object passes, and will not receive the light emitted from other directions, so there will be no situation where the object falls without being detected, thereby improving the accuracy of judging the object passing.

Description

Parallel light source grating device

technical field

The present invention relates to a grating device; more specifically, it relates to a parallel light source grating device.

Background technique

Please refer to FIGS. 1-3 . FIG. 1 is a schematic diagram of a known grating device, FIG. 2 is a schematic diagram of an operation of the grating device, and FIG. 3 is a schematic diagram of another operation of the grating device.

As shown in Figures 1 to 3, vending machines currently on the market usually install a grating device 1 at the exit of the object 2 to detect whether the detected object is indeed shipped, as shown in Figure 1, the known grating device 1 It includes a plurality of light transmitters 11, and a plurality of light receivers 12 corresponding to the plurality of light transmitters 11, wherein the light receiver 12 can accept the light sources A emitted from the plurality of light transmitters 11, and according to whether Receive the light source A to judge whether the object 2 has indeed fallen to the exit, that is, when the object 2 falls and passes between the light receiver 12 and the light emitter 11, the light receiver 12 will sense the light source A is covered, and then sends a signal that object 2 has fallen to the host of the vending machine. After receiving the signal, the host of the vending machine confirms that object 2 has been shipped, updates the information of object 2, and returns to the shopping mode to provide consumption or next purchase.

However, known grating devices have the following drawbacks:

1. The optical receiver 12 is prone to interpretation errors (1): As shown in Figure 2, when the object 2 falls and passes between the optical receiver 12 and the optical transmitter 11, although the object 2 will block part of the light from the optical transmitter 11 light source A, but because the light source A emitted by each light transmitter 11 is usually a scattering pattern, so the light source A received by the light receiver 12 is a multi-scattering pattern, so the light source A between the light receiver 12 and the light Different positions between the emitters 11 will form a difference in the density of the light source A. When the object 2 passes between the light receiver 12 and the light emitter 11, if only a small part of the light source A is covered, the light receiver 12 can still receive Most of the light source A caused it to be unable to judge the passage of object 2, so no instruction was sent to the vending machine host, resulting in errors in the follow-up processing procedures of the vending machine host, which may lead to errors in the inventory record of the vending machine, or failure to issue a confirmation message. The delivery signal caused the host of the vending machine not to return to the mode of purchasing by consumers, making the vending machine temporarily unable to purchase again.

2. The optical receiver 12 is prone to interpretation errors (2): As shown in Figure 3, when the object 2' is too small, the object 2' passing between the optical transmitter 11 and the optical receiver 12 will only cover a very small part The light source A, while the light receiver 12 still receives most of the other light sources A, at this time, the light receiver 12 cannot detect that the object 2' has fallen to the exit, so it is easy to cause interpretation errors.

3. It is difficult to control the receiving accuracy of the light source of the light receiver 12: To solve the aforementioned problems, some manufacturers will design the light receiver 12 to be based on the intensity of light or the characteristics of light (direction change, frequency change, etc., which can be adjusted according to the user's requirements). It is difficult to control the accuracy of the judgment, and it is impossible to accurately design the light intensity judgment settings when all objects pass through, so it is difficult to be accurate in logic design.

In view of this, the applicant in this case conducted in-depth discussions on the above-mentioned deficiencies based on years of research and development experience in related fields, and actively sought solutions based on the above-mentioned needs. After long-term hard research and multiple tests, the present invention was finally completed. .

Contents of the invention

The main purpose of the present invention is to provide a grating device, especially a collimated light source grating device that can improve the accuracy of object drop detection by adding a lens.

To achieve the above objectives, the parallel light source grating device of the present invention includes several light emitters, several light receivers, and several lenses.

The light emitters emit light sources for detecting objects, and the light emitters can be LEDs.

The plurality of light receivers correspond to the plurality of light emitters, and are used for receiving light, and then judging whether an object passes through.

Several lenses are arranged between the several light emitters and the several light receivers, and each lens respectively adjusts the light source emitted by the corresponding light emitters into multiple parallel lights, and directs them towards the corresponding light receivers After emitting, the multiple parallel lights form a light curtain; wherein, the distance between each light receiver is smaller than the cross-sectional size of the object, and the light receiver detects the object with the light curtain.

Wherein, the lens can be a Fresnel lens, and the light emitter is arranged at the focal point of the Fresnel lens, so the light scattered by the light source of the light emitter can be adjusted to parallel light through the Fresnel lens, and Emit towards the light receiver.

With the aforementioned structure, each light emitter of the present invention can scatter the light source toward the lens (Fresnel lens), and adjust the scattered light source into multiple parallel lights through the lens (Fresnel lens), and direct the light toward the light source. The receiver is emitted, and the light curtain formed by multiple flat lights is used to detect whether the object passes through; in particular, the light received by the light receiver of the present invention is all parallel light, and no direction other than parallel light is received. Therefore, when the object falls and passes through multiple parallel lights (light curtains), part of the parallel light received by the light receiver will be blocked. At this time, the light receiver will not be disturbed by light from other directions, so There will be no situation where the object has fallen but the object is not sensed, so that the accuracy of judging the passing of the object can be improved, and finally the signal that the object has passed the parallel light (light curtain) is sent to the vending machine host to make the vending machine Update information on the machine host, and return to the normal state that can be purchased by consumers.

Supplementing the above, the present invention can be set at the exit of the vending machine object, or the gate for controlling the entry and exit of personnel, or in other equivalent control application equipment, so that the object, or personnel, or other related goods that need to be controlled can be Utilize the present invention to detect the passing time, and can record the passing quantity.

Description of drawings

Fig. 1 is the schematic diagram of known grating device;

FIG. 2 is a schematic diagram of an action of a known grating device;

FIG. 3 is another schematic diagram of the operation of the known grating device;

4 is a schematic diagram of a parallel light source grating device of the present invention;

Fig. 5 is a partially enlarged schematic diagram of the parallel light source grating device of the present invention;

FIG. 6 is a schematic diagram of the operation of the parallel light source grating device of the present invention.

Explanation of symbols in the accompanying drawings:

3 parallel light source grating device; 31 light emitter; 32 light receiver; 33 lens; A' light source; B light curtain; 4 objects;

Explanation of symbols in known art:

1 grating device; 11 light emitter; 12 light receiver; A light source; 2, 2’ object.

Detailed ways

In order to have a more detailed understanding of the purpose, function, features and structure of the present invention, preferred embodiments are given and described as follows with accompanying drawings.

First, please refer to Figures 4-6. Figure 4 is a schematic diagram of the parallel light source grating device of the present invention, Figure 5 is a partially enlarged schematic view of the parallel light source grating device of the present invention, and Figure 6 is a schematic diagram of the operation of the parallel light source grating device of the present invention.

As shown in the figure, the parallel light source grating device 3 of the present invention includes several light emitters 31 , several light receivers 32 , and several lenses 33 .

The light emitters 31 emit a light source A' for detecting the object 4, and the light emitters 31 can be LEDs.

The plurality of light receivers 32 are corresponding to the plurality of light emitters 31 for receiving light and then judging whether the object 4 passes through.

Several lenses 33 are arranged between the several light emitters 31 and the several light receivers 32, and the lenses 33 correspond to the light emitters 31 and the light receivers 32, and the lenses 33 will emit the light emitted by the light emitters 31. The light source A' is adjusted to multiple parallel lights, and emits toward the light receiver 32, and the multiple parallel lights form a light curtain B; wherein, the distance between the multiple parallel lights is smaller than the cross-sectional size of the object 4, and the distance between the multiple parallel lights is smaller than the cross-sectional size of the object 4, and the Multiple parallel lights (light curtain B) sense the object 4 .

Wherein, the lens 33 can be a Fresnel lens, and the light emitter 31 is arranged at the focal point of the Fresnel lens, so after the light source A' of the light emitter 31 scatters to the Fresnel lens, it will be adjusted to Multiple parallel beams are emitted toward the light receiver 32 , the multiple parallel beams form a light curtain B, and the light receiver 32 uses the light curtain B to detect the object 4 .

In particular, the present invention can be set at the exit of the object 4 of the vending machine, or the gate for controlling the entry and exit of personnel, or in other equivalent control application equipment, so that the object 4, or personnel, or other related goods to be controlled All can utilize the present invention to detect the passing time, and can record the passing quantity.

A detailed description of the embodiments of the present invention and related drawings for reference is as follows:

Please refer to FIGS. 4-6 . In this embodiment, the lens is a Fresnel lens, and the present invention is installed at the exit of the vending machine as an example.

First, the light source A' is emitted by the light emitter 31. The light source A' can be a point light source provided by the LED, and emits towards the direction of the light receiver 32 in a scattered state. Each light emitter 31 is arranged at the focal point of each Fresnel lens Therefore, when the scattered light source A' is emitted from the focal point, the scattered light source A' will be adjusted into multiple parallel lights after passing through the corresponding Fresnel lens, and will be emitted towards the direction of the light receiver 32, while the multiple parallel lights The light forms the light curtain B, and the light receiver 32 can judge the passage of the object 4 by sensing the light curtain B.

Continuing from the above, the light received by the light receiver 32 is all parallel light, and no light incident from other directions is received. Therefore, when it is judged whether the object 4 passes through, it will not sense light incident in a parallel direction. Avoid sensing errors, so that the lack of objects passing through without sensing can be solved, so as to improve the accuracy of judging that the vending machine is indeed shipped.

Furthermore, when the vending machine is in the normal operation mode, the light transmitter 31 will keep emitting the light source A', and the light receiver 32 will keep receiving multiple parallel lights (light curtains B). When the consumer chooses the object 4 on the vending machine, after clicking the object 4 and completing the payment, the object 4 will fall from the shelf in the vending machine and pass through the parallel gap between the light receiver 32 and the Fresnel lens. At this time, the object 4 will instantly cover part of the light curtain B, and the light receiver 32 of this moment part cannot sense the covered light curtain B, and no light from other directions will enter the light receiver. 32. Therefore, it can be immediately and accurately determined that object 4 has passed, and a signal that object 4 has passed is sent to the vending machine host, so that the vending machine host confirms that it has been shipped, and updates the stock of object 4 shipped, and returns to the available The mode for consumers to choose and buy is for consumers to make the next purchase.

Supplement the foregoing, the present invention can make each light receiver 32 receive multiple parallel lights, that is, the aforementioned light curtain B, only by installing several lenses (Fresnel lenses), and the size of the object 4 is larger than each The distance between the light receivers 32 is such that each light receiver 32 can fully sense the moment when all objects 4 pass through the light curtain B; It is parallel light, so the light receiver 32 will only sense whether the parallel light is blocked when sensing light, and will not be disturbed by light incident from other directions at all, so it can avoid the object in the known technology from being blocked. The light that passes through the detection, but the light receiver 32 still receives light from other directions, resulting in no judgment that the object 4 has passed, so the present invention can achieve accurate judgment of the object 4 to be shipped by simply adding a lens effect.

In summary, the advantages of the parallel light source grating device of the present invention are:

1. Accurately judge that the object has indeed passed through: the light receiver will only receive multiple parallel lights (light curtains) and will not be interfered by light from other directions, so when the object passes through the light curtain, it will By shielding part of the parallel light received by the light receiver, the light receiver can accurately judge that the object has passed, and there will be no lack of not sensing that the object has passed due to receiving other light rays in the known technology.

2. Simple components can achieve accurate detection of object passing: the invention only adds a few lenses to make the light source adjustable into parallel light, so that the light receiver can only receive whether the parallel light is blocked, and can judge whether it is Objects passing through will not be affected by light incident from other directions, so the effect of accurately judging the passing of objects can be achieved without complicated design.

The above is only a preferred embodiment of the present invention, and any other equivalent structural changes made by applying the description of the present invention and the scope of the patent application should be included in the scope of the patent application of the present invention.

Claims (4)

1. A parallel light source grating device, comprising several light emitters, several light receivers, and several lenses; The plurality of light emitters emit light sources for detecting objects; The plurality of light receivers, corresponding to the plurality of light emitters, are used to receive light, and then judge whether the object passes through; It is characterized in that several lenses are arranged between the several light emitters and the several light receivers, and the lenses correspond to the light emitters and the light receivers, and the lenses adjust the light source emitted by the light emitters to A plurality of parallel lights are emitted towards the corresponding light receivers to form a light curtain; wherein, the distance between each light receiver is smaller than the cross-sectional size of the object, and the light receiver uses the multi-channel parallel light to illuminate the object. detection. 2. The parallel light source grating device according to claim 1, wherein the lens is a Fresnel lens, and the light emitter is arranged at the focal point of the Fresnel lens, so that the light emitter The emitted scattered light source is adjusted to parallel light through Fresnel lens. 3 . The parallel light source grating device according to claim 1 , characterized in that, the parallel light source grating device is arranged at an item exit of a vending machine. 4 . 4. The parallel light source grating device as claimed in claim 1, wherein the light emitter is an LED.