Parallel light source grating device

Abstract

The invention discloses a parallel light source grating device. The parallel light source grating device comprises a plurality of light emitters used for providing light sources, a plurality of lightreceivers which correspond to the light emitters and are capable of receiving light, and a plurality of lenses arranged between the light emitters and the light receivers, wherein each lens is used for adjusting the corresponding light source of the corresponding light emitter into parallel light from general scattered light and emitting the parallel light towards the corresponding light receiver,a plurality of parallel light forms the form of a light curtain, and the distance between the light receivers is smaller than the sectional size of an object; when the object falls and passes throughthe light curtain, a part of parallel light can be shielded, and at the moment when the object passes through the light curtain, parts of the light receivers can not receive the parallel light and cannot receive light incident in other directions, so that the situation that the object falls and is not detected is avoided, and the passing accuracy of the object can be improved.

Description

technical field [0001] The present invention relates to a grating device; more specifically, it relates to a parallel light source grating device. Background technique [0002] see Figure 1~3 as shown, figure 1 is a schematic diagram of a known grating device, figure 2 is a schematic diagram of the operation of the grating device, image 3 It is another schematic diagram of the operation of the grating device. [0003] Such as Figure 1~3 As shown, the 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, such as figure 1 Among them, the known grating device 1 includes a plurality of light emitters 11, and a plurality of light receivers 12 corresponding to the plurality of light emitters 11, wherein the light receiver 12 can accept the light received from the plurality of light emitters 11 The emitted light source A, and judge whether the object 2 has indeed fal...

AI Technical Summary

Problems solved by technology

[0005] 1. The optical receiver 12 is prone to interpretation errors (1): as figure 2 As shown, when the object 2 falls and passes between the light receiver 12 and the light emitter 11, although the object 2 will partially block the light source A from the light emitter 11, due to the light source A emitted by each light emitter 11 Usually it is in the form of scattering, so the light source A received by the light receiver 12 is in the form of multiple scattering, so the difference in the density of the light source A will be formed at different positions between the light receiver 12 and the light transmitter 11, when 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, making it impossible to judge that the object 2 passed, so there is no Sending instructions to the main unit of the vending machine will cause errors in the follow-up processing procedures of the main unit of the vending machine, which may cause errors in the inventory record of the vending machine, or fail to send out a signal that the product has been shipped, resulting in the main unit of the vending machine not returning to the consumer for purchase mode, making the vending machine temporarily unable to purchase again

[0006] 2. The optical receiver 12 is prone to interpretation errors (2): as image 3 As shown, when the volume of the object 2' is too small, the object 2' passing between the light emitter 11 and the light receiver 12 will only cover a very small part of the light source A, while the light receiver 12 still receives most of the other light sources A. At this time, the optical receiver 12 cannot detect that the object 2' has fallen to the exit, so it is easy to cause interpretation errors

[0007] 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). Set by yourself) to judge whether the object falls or not, but the accuracy of the judgment is difficult to control, and it is impossible to accurately design the light intensity judgment setting when all objects pass through, so it is difficult to be accurate in logic design

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