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CN-224232183-U - Invisible code reading device with double optical filters

CN224232183UCN 224232183 UCN224232183 UCN 224232183UCN-224232183-U

Abstract

The utility model relates to a double-filter invisible code reading device which comprises a shell bracket, an illumination component, an illumination filter, a lens component, an image sensor and a lens filter. The illumination filter and the lens filter are mutually matched, so that only the light wave band emitted after the invisible codes are excited is captured by the image sensor. By arranging the double optical filters, the reflection interference can be effectively eliminated, and the imaging contrast of the invisible codes is improved.

Inventors

  • LUO SHIRUI
  • HU JING
  • CHEN HUANGJIAN
  • SU MANHUA

Assignees

  • 福建新大陆自动识别技术有限公司

Dates

Publication Date
20260512
Application Date
20250609

Claims (10)

  1. 1. An invisible code reading device with double optical filters, comprising: A housing bracket (1); The lighting module (2) is arranged in the shell bracket (1) and comprises a lighting module (21) and a lighting filter (22); The imaging module (3) is arranged in the shell bracket (1) and comprises an image sensor (31), a lens module (32) and a lens filter (33); the light wave band emitted by the lighting module (21) corresponds to an invisible code excitation wave band to be identified, and the lighting filter (22) filters out the light rays of the intersection part of the light rays emitted by the lighting module (21) and the emitting wave band of the invisible code to be identified; The lens filter (33) only transmits the light wave band emitted after the invisible codes are excited.
  2. 2. The invisible code reading device with double optical filters according to claim 1, wherein the illumination module (21) comprises an illumination circuit board and an illumination light source, wherein the illumination light source is arranged on the illumination circuit board, and the illumination optical filter (22) is positioned right in front of the illumination module (21).
  3. 3. The invisible code reading device with the double optical filters according to claim 2, wherein the illumination module (2) further comprises illumination light distribution optical devices (23).
  4. 4. The invisible code reading apparatus according to claim 1, wherein the illumination filter (22) further filters out light rays of non-invisible code excitation bands in the light rays emitted by the illumination module (2).
  5. 5. The invisible code reading apparatus according to claim 1, wherein the imaging module (3) further comprises a lens holder (34), the lens holder (34) fixing the lens module (32) and isolating the illumination filter (22) from the lens filter (33).
  6. 6. The invisible code reading apparatus according to claim 1, wherein the lens module (32) is disposed at a front end of the image sensor (31), and the lens filter (33) is disposed at a front end of the lens module (32) or between the lens module (32) and the image sensor (31).
  7. 7. The invisible code reading apparatus according to claim 1, wherein the photosensitive wavelength band of the image sensor (31) and the light transmission wavelength band of the lens module (32) comprise invisible code emission light wavelength bands.
  8. 8. The invisible code reading device with double optical filters according to claim 1, further comprising a main board (4), wherein a decoding module and a processor module are arranged on the main board (4).
  9. 9. The invisible code reading device with the double optical filters according to claim 1, wherein a reading window and a protective transparent screen (11) are arranged at the front end of the shell bracket (1), and the protective transparent screen (11) covers the reading window.
  10. 10. The invisible code reading apparatus according to claim 9, wherein the area of the lens filter (33) is smaller than that of the illumination filter (22), the lens filter (33) is located at the center of the reading window, and the illumination filter (22) is located at the periphery of the reading window.

Description

Invisible code reading device with double optical filters Technical Field The invention relates to the field of bar code reading, in particular to an invisible code reading device with double optical filters. Background With the development of the anti-counterfeiting code technology, the invisible anti-counterfeiting code technology is widely applied to various product production fields. Invisible codes, namely invisible bar codes, are printed by adopting an invisible printing technology, cannot be identified by human eyes, and are required to be imaged and read by special reading equipment. The invisible code needs illumination light with specific wavelength for irradiation excitation, and the bar code emits light different from the excitation wave band of the bar code due to the photoluminescence principle, so that the bar code can be identified. Meanwhile, the excitation illumination light required by the invisible codes is strong, and the emitted light is weak. Therefore, although the bar code can be identified after being excited by specific light, the light reflected by the bar code background can be identified, the imaging contrast of the bar code and the background is lower, and the difficulty of reading is higher. In order to improve imaging effect, the conventional invisible code reading device is often provided with a single optical filter at a lens end. Although the lens filter filters most of the illumination light, the image sensor receives all the light emitted by the covert code, but also receives a small portion of the illumination excitation light and other stray light, which would cause significant interference with the weak covert code emission light. Especially, the problem of reflection interference exists for the invisible codes on the high-reflection materials, and the reading angle needs to be continuously adjusted during reading so as to avoid the reflection point. In the application scene which can only be read vertically, or in the application scene which can be read in a moving way, the problem of obvious reflection exists, the imaging effect is affected, and the reading performance is further affected. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to provide the invisible code reading device with the optical filter aiming at the defects of the prior art, so that the invisible code can be read, the reflective interference can be eliminated, the imaging contrast is improved, and the reading efficiency and the environment suitability are further improved. In order to solve the technical problems, the invention adopts the following technical scheme: Technical proposal An invisible code reading device with double optical filters, comprising: A housing bracket; The illumination module is arranged in the shell bracket and comprises an illumination module and an illumination filter; The imaging module is arranged in the shell bracket and comprises an image sensor, a lens module and a lens filter; The illumination filter filters out the light rays of the intersection part of the light rays emitted by the illumination module and the emission wave band of the invisible code to be identified; the lens filter only transmits the light wave band emitted after the invisible codes are excited. The illumination module comprises an illumination circuit board and an illumination light source, wherein the illumination light source is arranged on the illumination circuit board, and the illumination filter is positioned right in front of the illumination light source. The illumination module further comprises illumination light distribution optical devices. The illumination filter also filters out light rays of non-invisible code excitation wave bands in the light rays emitted by the illumination module. The imaging module further comprises a lens bracket, wherein the lens bracket is used for fixing the lens module and isolating the illumination filter and the lens filter. The lens module is arranged at the front end of the image sensor, and the lens filter is arranged at the front end of the lens module or between the lens module and the image sensor. The photosensitive wave band of the image sensor and the light transmission wave band of the lens module comprise invisible code emitted light wave bands. The system further comprises a main board, wherein a decoding module and a processor module are arranged on the main board. The front end of the shell support is provided with a reading window and a protective transparent screen, and the protective transparent screen covers the reading window. The area of the lens filter is smaller than that of the illumination filter, the lens filter is positioned at the center of the reading window, and the illumination filter is positioned at the periphery of the reading window. According to the invisible code reading device with the double optical filters, the illuminating optical filter and the lens optical filter are