Optical reading head

Abstract

An optical read head used to read the image of an object. The optical pickup head includes a casing, a diffusion structure, a light source module and a photosensitive module. A diffusive construction is attached to the housing. The light source module has a substrate and a first light source mounted on the front surface of the substrate. The front side of the substrate is secured to the outer surface of the diffusing construction. The first light source provides initial light input into the diffuse structure. The diffuse structure further processes the initial light into a uniform light and then outputs it. The photosensitive module is fixed in the housing and is used for sensing the reflected light generated by the uniform light reflected by the object. Using the present invention can eliminate the identification dead angle caused by strong reflected light, improve the lighting efficiency to reduce the number of light sources and power consumption, and improve the uniformity of lighting to increase the allowable range of inclination angle.

Description

technical field [0001] The invention relates to an optical pickup head. Background technique [0002] figure 1 It is an application schematic diagram of a traditional optical pickup head. Such as figure 1 As shown, the optical pickup head 101 is used to read the object 102 , wherein the optical pickup head 101 includes a hollow shell 110 , a light source module 120 and a photosensitive module 140 . The light source module 120 is fixed in the hollow casing 110 and provides light. The light irradiates the object 102 after being reflected in the hollow casing 110 . The photosensitive module 140 is fixed in the hollow casing 110 for sensing light reflected by the object 102 . [0003] The reflection of light can be divided into three forms, namely specular reflection, diffuse reflection and diffuse reflection. Specular reflection means that the angle of incidence of light rays is equal to the angle of reflection. Diffuse reflection occurs when an uneven surface reflects l...

AI Technical Summary

Problems solved by technology

figure 2 The optical read head of the figure 1 , the difference is that the light from the LED 120 as the light source module directly hits the object 102, which is very likely to cause reflected strong light to enter the photosensitive module 140 and further reduce the contrast.

[0008] Therefore, the disadvantages of the optical pickup head in the prior art are that it is impossible to avoid the dead angle of identification caused by reflected strong light, it is impossible to effectively improve the lighting efficiency to reduce the usage and power consumption of LEDs, and it is impossible to effectively increase the allowable range of the tilt angle.

In addition, the assembly of prior art optical read heads is quite complex

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