Optical reading head

Abstract

An optical pickup head is provided, which is utilized for picking up the image of an object. The optical pickup head comprises a shell body, a diffusion structure, an optical source module and a sensitization module. The diffusion structure is connected with the shell body. The optical source module is provided with a basal plate and a first optical source positioned on the facade of the basal plate. The facade of the basal plate is positioned on the external surface of the diffusion structure. The first optical source provides an initial light ray and casts the light ray into the diffusion structure. Then, the diffusion structure processes the initial light ray into an equalized light ray and transmits the processed light ray. The sensitization module is positioned inside the shell body to sense a reflected light ray which is produced when the equalized light ray is reflected by the object. Therefore, the invention can be applied to eliminate the identification dead corner resulted from strong reflected light ray, enhance the lighting efficiency, reduce the number of optical sources and consumption of electric power, improve the evenness of lighting and improve the allowed scope for inclined 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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