Contact type image sensor and scanning method thereof

An image sensor, contact technology, applied in the direction of image communication, electrical components, etc., can solve the problems of lowering, abnormal lines or points, etc., and achieve the effect of simple and compact structure and saving space

CN103945084AInactive Publication Date: 2014-07-23SUZHOU INST OF INDAL TECH
5 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-07-23
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a contact type image sensor and a scanning method of the contact type image sensor. The contact type image sensor is characterized by comprising three sets of phototonus sensors and a control module. The three sets of phototonus sensors are arranged below cylindrical lens sets, the distances between the phototonus sensors and the cylindrical lens sets in the scanning direction are larger than or equal to 0.3 mm, and the phototonus sensors and the cylindrical lens sets are connected with a photosensitive circuit, so that after each pixel passes through the three sets of phototonus sensors in the image scanning process, the photosensitive circuit outputs three sets of electrical signals respectively; the control module conducts comparison on every two sets of the three sets of electrical signals of the same pixel, and the average value of the two sets of electrical signals of the smallest difference is obtained to serve as the final output electrical signal of the pixel. By means of the contact type image sensor and the scanning method of the contact type image sensor, unusual influences of dust and dirty points on the phototonus sensors on the quality of the scanned images can be effectively avoided.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a contact image sensor and a scanning method thereof, in particular to a contact image sensor capable of avoiding dirt spots and dust and a scanning method thereof. Background technique

[0002] In paper-fed scanners or banknote sorting machines, contact image sensors (CIS) are used more and more, and at the same time more and more attention is paid to image quality. The quality of images will affect the recognition rate of scanned objects. However, in the application of these devices, the dust and dirty spots brought into the machine by paper or coins have always been the biggest problem, and the dust and dirty spots will cover the light sensor. Traditional CIS generally includes LED light guide column, LED light source, rod lens group (Rod Lens), glass, light sensing sensor and photosensitive circuit board arranged in the shell, so that the LED light guide column irradiates the LED light source through the glass to the scann...

Examples

Embodiment Construction

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0029] A CIS generally includes an LED light guide column, a cylindrical lens group, glass, a photosensitive sensor, a photosensitive circuit and a connector joint arranged in a housing. A contact image sensor provided by the present invention includes a control module and is arranged on the There are three groups of photosensitive sensors under the cylindrical lens group, and the three groups of photosensitive sensors are arranged at fixed intervals, and are connected to photosensitive circuits, so that when scanning images, each pixel passes through three groups of photosensitive sensors, and the photosensitive circuits respectively obtain three groups of photoelectric sensors. signal, and the distances between the three groups of photosensitive sensors along the scanning direction are greater than or equal to 0.3mm; the control module compares ...