Optical detection device to prevent light leakage

Abstract

The invention discloses an optical detection apparatus for preventing light leakage. The optical detection apparatus comprises a light source, an optical detection assembly, a packaging structure and a shading member. A sampling signal is output by the light source to irradiate a to-be-measured object. The optical detection assembly is arranged next to the light source, and keeps a distance with the light source. The optical detection assembly is used for receiving the sampling signal reflected by the to-be-measured object. The packaging structure is used for coating the light source and the optical detection assembly. The packaging structure comprises an out-light surface unit and an in-light surface unit which are respectively arranged on the light source and the optical detection assembly. The packaging structure also comprises a segmentation member which is arranged between the in-light surface unit and the out-light surface unit. The shading member is arranged on the segmentation member for blocking that the sampling signal is projected to the in-light surface unit without reflection by the to-be-measured object.

Description

technical field [0001] The invention provides an optical detection device, especially an optical detection device capable of preventing light leakage. Background technique [0002] Traditional light sensing modules are prone to poor sensing accuracy due to light leakage. The reason is usually that the light isolation mechanism of the light sensing module is not well designed. Part of the light signal will be directly transmitted to the light-receiving component, and the light-receiving component will read light signals other than non-sensing light, which will degrade the signal quality and affect the sensing accuracy. For example, US patent US 8,888,701, according to which Figure 7-8 As shown, the light sensing module is provided with a signal transmitter (component number 102) and a signal receiver (component number 103) adjacent to each other. Although the light sensing module uses two sets of lens structures (component number 715) to guide the signal transmitter to emit...

AI Technical Summary

Problems solved by technology

Although the light sensing module uses two sets of lens structures (component number 715) to guide the signal transmitter to emit sensing light and guide the sensing light reflected from the object to be read by the signal receiver, but the signal receiver and the signal There is no compartment structure in the middle of the transmitter, and the signal receiver will receive part of the leakage sensing light directly emitted from the signal transmitter

The part of the leaked sensing light does not carry the characteristic information of the object to be measured, which will significantly reduce the sensing accuracy of the light sensing module

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