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Optical reading head with diffuseness structure

An optical read head and structure technology, applied in the field of optical read heads, can solve the problems of inability to effectively improve lighting efficiency, reduce LED usage and power consumption, and reduce contrast, etc.

Inactive Publication Date: 2009-04-15
SUNPLUS MMEDIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The optical pickup head in FIG. 2 is similar to that in FIG. 1, except that the light from the LED 120 is used to directly hit the object 102. This situation 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 reading head of the known technology are that it is impossible to avoid the dead angle of identification caused by reflected strong light, and it is impossible to effectively improve the lighting efficiency to reduce the usage of LEDs and Power consumption, and the allowable range that cannot effectively increase the tilt angle

Method used

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  • Optical reading head with diffuseness structure
  • Optical reading head with diffuseness structure
  • Optical reading head with diffuseness structure

Examples

Experimental program
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no. 1 example

[0033] FIG. 3 is a schematic diagram showing the application of the optical pickup head according to the first embodiment of the present invention. As shown in FIG. 3 , the optical pickup head 1 of this embodiment is used to read an object 2 . The object 2 is, for example, an electronic book, on which a pattern such as a two-dimensional barcode is printed. The optical pickup head 1 includes a hollow shell 10 , a light source module 20 , a diffusion structure 30 and a photosensitive module 40 .

[0034] The light source module 20 is fixed in the hollow casing 10 and provides an initial light L1. The light source module 20 includes but not limited to one light emitting diode or a plurality of light emitting diodes. Multiple LEDs can emit the same light or different lights. In this embodiment, a light emitting diode is taken as an example for illustration, and the initial light L1 is reflected by an inner wall surface 13 of the hollow casing 10 into the diffusion structure 30 ...

no. 2 example

[0040] This embodiment uses a tubular diffuser structure to provide uniform light.

[0041]FIG. 4 is a schematic diagram showing the application of the optical pickup head according to the second embodiment of the present invention. As shown in Figure 4, the optical pickup head of this embodiment is similar to the first embodiment, the difference is that the diffusion structure 30 is a hollow tube, which is installed in an opening of the hollow shell 10 11. Therefore, the initial light L1 first refracts and penetrates into the diffusion structure 30 , and then performs reflection in the diffusion structure 30 . It should be noted that the diffusion structure 30 can be a solid cylinder. The solid cylinder helps to isolate the outside dust from the photosensitive module 40 . Alternatively, the diffusion structure 30 may be composed of a hollow tube and a transparent member for sealing the hollow tube. Wherein, the diffuse structure can be made by adding white dye to PC, acry...

no. 3 example

[0044] In this embodiment, uniform light is provided by a tubular diffuser structure combined with a light integration structure.

[0045] FIG. 5 is a schematic diagram showing the application of the optical pickup head according to the third embodiment of the present invention. As shown in FIG. 5 , the optical pickup head of this embodiment is similar to the first embodiment, the difference is that the diffusion structure 30 is installed in an opening 11 of the hollow casing 10 and the hollow casing 10 An inner retaining edge 14 of. Thus, the diffuser structure 30 , the hollow casing 10 and the inner retaining edge 14 can form a closed space 15 for use as a light integrating structure. And cooperate with the diffusion structure 30 to provide more uniform light.

[0046] In this embodiment, the light emitting diodes of the light source module 20 are located in the confined space 15, and the initial light L1 first refracts and penetrates the diffusion structure 30, and then p...

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Abstract

The invention discloses an optical pickup head which has a diffusion structure and is used for fetching an object. The optical pickup head comprises a hollow shell, a light source module, the diffusion structure and a sensitization module. The light source module is fixed in the hollow shell and provides an initial beam. The diffusion structure is connected to the hollow shell and receives the initial beam, and processes the initial beam into an even beam. The initial beam is reflected for a plurality of times in the diffusion structure to form the even light. The sensitization module is fixed in the hollow shell to sense the even beam reflected by the object, wherein, one optical axis of the sensitization module is substantially parallel to an axial direction of the diffusion structure.

Description

technical field [0001] The present invention relates to an optical reading head with a diffuse structure, in particular to an optical reading head with a tubular or columnar diffuse structure to improve the reading success rate of two-dimensional barcodes and remove the reflected stray light. The problem of identifying dead angles is caused. Background technique [0002] FIG. 1 shows an application schematic diagram of a conventional optical pickup head. As shown in FIG. 1 , the optical pickup head 101 reads an 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 a light. The light irradiates the object 102 after being reflected within the hollow casing 110 . The photosensitive module 140 is fixed in the hollow casing 110 to sense the light reflected by the object 102 . [0003] The reflection of light can be div...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10G02B7/02G02B7/00
Inventor 吴智孟林焜尉
Owner SUNPLUS MMEDIA
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