CN114710595A - Line scanning geometric camera - Google Patents

Abstract

The invention discloses a line scanning geometric proportion camera, which comprises a frame body (1) playing a supporting role, wherein an optical lens (3) is arranged in the frame body (1), a light source (4) is arranged on the side surface of the optical lens (3), a circuit substrate (5) is arranged below the optical lens (3), an array photoelectric conversion chip (6) is arranged on the circuit substrate (5), and a transparent plate (2) is arranged above the optical lens (3).

Description

Line scanning geometric camera

Technical Field

The invention relates to the technical field of cameras, in particular to a line-scan geometric proportion camera for realizing high-pixel-density scanning by using a low-pixel-density IC (integrated circuit).

Background

At present, the linear scanning equal ratio camera is widely applied to the fields of fax machines, scanners, paper money sorting, counterfeit identification and the like, and the linear scanning equal ratio camera is gradually applied to industrial production to perform image recognition and flaw identification along with the development of production technology and production requirements.

At present, the mainstream 600DPI line scan equal ratio camera cannot meet the production requirement, needs a higher pixel density line scan equal ratio camera to deal with, and the existing line scan equal ratio camera structure comprises a photoelectric conversion chip, wherein the photoelectric conversion chip is used for receiving external light to perform photoelectric conversion and converting an optical signal into an electrical signal. The photoelectric conversion chip is provided with a plurality of light holes, and the light holes can be set to be corresponding according to the requirement of pixel density. The main method for improving the pixel density of the linear scanning equal ratio camera is to reduce the area of the light hole and increase the density of the light hole, so that the light quantity received by the light hole is reduced under the condition of certain external light intensity and illumination time, the generated charges are reduced, namely the output voltage (sensitivity) is reduced, and the image is difficult to accurately identify; in addition, the high-resolution photoelectric conversion chip requires high pixel density of the optical lens used in combination with the high-resolution photoelectric conversion chip, but the pixel density of the optical lens is limited.

Disclosure of Invention

The purpose of the invention is as follows: the invention aims to solve the defects in the prior art and provides a line-scan geometric proportion camera for realizing high-pixel-density scanning by using a low-pixel-density IC.

The technical scheme is as follows: the utility model provides an use low pixel density IC to realize line of high pixel density scanning geometric proportion camera, is equipped with optical lens including the framework that plays the supporting role in the framework, and optical lens's side is equipped with the light source, and optical lens's below is equipped with the circuit base plate, is equipped with the photoelectric conversion chip of array on the circuit base plate, and optical lens's top is equipped with the transparent plate, and the scanning process is:

1) the light emitted by the light source is irradiated on the scanned original manuscript, and various image-text information on the scanned original manuscript generates reflected light and exciting light;

2) a part of reflected light and excitation light on the scanned original enter the optical lens, and the reflected light and the excitation light coming out of the other end of the optical lens irradiate the photoelectric conversion chip;

3) the photoelectric conversion chip converts the received optical signal into an electric signal;

4) the relative position of the original and the sensor is moved, the written image-text information is continuously read, and the image information scanning of the original is completed.

The invention is further improved in that the photoelectric conversion chip forms a fixed included angle with the main scanning direction.

A further improvement of the present invention is that the vertical direction of the main scanning is provided with sub scanning.

A further improvement of the present invention is that the pixel density of the sub-scanning is equal to the pixel density of the main scanning.

The invention is further improved in that the extraction and recombination of the image data of the actual target object are performed after the completion of the main scanning and the sub-scanning.

A further improvement of the present invention is that the number of photoelectric conversion chips can be increased.

Compared with the prior art, the method at least has the following beneficial effects:

the invention provides a line scanning geometric proportion camera for realizing high pixel density scanning by using a low pixel density IC.A photoelectric conversion chip converts received optical signals into electric signals, recorded image-text information is continuously read, thus the image information scanning of an original manuscript is completed, a scanning image of a scanning target object can be formed according to the combination of actual sequences, thus the image can be accurately identified, and the requirement of the market on high pixel density scanning is met.

Drawings

FIG. 1 is a schematic cross-sectional view of a conventional linear-scan geometric camera;

FIG. 2 is a schematic diagram of a front view of a line-scan geometric camera according to the present application;

FIG. 3 is a schematic cross-sectional view of a line-scan isometric camera of the present application;

fig. 4 is a schematic position diagram of a photoelectric conversion chip mounted on a circuit substrate of a line scan geometric proportion camera according to the present application;

fig. 5 is an example of scanning 4 x 4 pixels using a line-scan equal ratio camera of the present application.

Reference numerals: the device comprises a frame body 1, a transparent plate 2, an optical lens 3, a light source 4, a circuit substrate 5 and a photoelectric conversion chip 6.

Detailed Description

Exemplary embodiments of the present invention will now be described in detail. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

Referring to fig. 1-5, the present invention relates to a line scan geometric proportion camera using low pixel density IC to realize high pixel density scan, which comprises a frame 1 for supporting, an optical lens 3 is arranged in the frame 1, a light source 4 is arranged on the side surface of the optical lens 3, a circuit substrate 5 is arranged below the optical lens 3, an array photoelectric conversion chip 6 is arranged on the circuit substrate 5, a transparent plate 2 is arranged above the optical lens 3, and the scanning process is as follows:

1) the light emitted by the light source 4 is irradiated on the scanned original manuscript, and various image-text information on the scanned original manuscript generates reflected light and exciting light;

2) a part of the reflected light and the excitation light on the scanned original enters the optical lens 3, and the reflected light and the excitation light coming out from the other end of the optical lens 3 are irradiated onto the photoelectric conversion chip 6;

3) the photoelectric conversion chip 6 converts the received optical signal into an electrical signal;

4) the relative position of the original and the sensor is moved, the written image-text information is continuously read, and the image information scanning of the original is completed.

The photoelectric conversion chip 6 and the main scanning direction form a fixed included angle; the vertical direction of the main scanning is provided with sub scanning; the pixel density of the sub-scanning is equal to the pixel density of the main scanning; extracting and recombining actual target object image data after the main scanning and the sub-scanning are finished; the number of photoelectric conversion chips 6 can be increased.

The chinese name of CIS is a line scan geometric camera. The device adopts a contact type photosensitive element (photosensitive sensor) to carry out photosensitive, 300-600 red, green and blue three-color LED (light emitting diode) sensors are tightly arranged together at a position of 1-2 mm below a scanning platform to generate a white light source, complex mechanisms such as a CCD array, a lens, a fluorescent tube, a cold cathode ray tube and the like in a CCD scanner are replaced, and the light, the machine and the electricity of the CCD scanner are integrated into a machine and an electricity of the CIS scanner. The scanner made by CIS technology has the advantages of small volume, light weight, low production cost and the like, and is widely applied in the fields of fax machines, scanners, banknote sorting and changing and the like.

In the invention, the number of photosensitive chips of the camera is set to be m (m is more than or equal to 1), the pixel density of each photosensitive chip of the CIS is R, the length is a, the number of pixels is n, the length directions of all the photosensitive chips of the CIS form an included angle alpha with the same degree with the main scanning direction of the CIS (in the application, the requirement of alpha is that the value of tan alpha is a positive integer), and the projection distance of the first pixel of the adjacent IC in the main scanning direction is less than or equal to a.cos alpha. Then, the length projection b of each photo chip in the main scanning direction of the CIS (the scanning length of each photo chip in the main scanning direction) is a.cos α, the number of pixel projections (the number of scanning pixels in the main scanning direction of each photo chip) is also n, and the projected pixel density R' (the pixel density in the main scanning direction of the CIS of each photo chip) becomes R/cos α by definition of the pixel density. Correspondingly, the pixel density of the CIS in the sub-scanning direction should also be R'.

The dots in fig. 5 are illustrated as single pixel dots, and when tan α =2, if the image of 4 × 4 pixels is to be completely scanned, the number of rows actually scanned by the IC is 10. After scanning, if the image data actually output by the camera is directly synthesized into an image, the image will be a deformed image, and therefore, extraction and recombination of the image data of the actual target object are also required.

The shadow part in the upper figure is a scanning target object part, the pixel number of the shadow part in the upper figure, namely the intersection point of the horizontal line and the vertical line in the square grid is extracted, and the pixel number are combined according to the actual sequence to form a scanning image of the scanning target object. If the number of ICs of the camera is more than 1, the target object images which are calculated and combined by each IC need to be combined into one image in sequence left and right. Based on the linear scanning geometric proportion camera in the application, the number of the photoelectric conversion chips 6 can be increased according to actual requirements.

In summary, the present invention provides a line-scan geometric camera using a low pixel density IC to achieve high pixel density scanning, wherein a photoelectric conversion chip converts a received optical signal into an electrical signal, and recorded image-text information is continuously read, so as to complete image information scanning of an original document.

Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are intended to be illustrative only and not to limit the scope of the invention, which is defined by the appended claims, and that modifications may be made to the above embodiments by those skilled in the art without departing from the scope and spirit of the invention.

Claims (6)

1. A line-scan geometric camera for implementing high pixel density scanning with a low pixel density IC, comprising: including framework (1) that plays supporting role, be equipped with optical lens (3) in framework (1), the side of optical lens (3) is equipped with light source (4), the below of optical lens (3) is equipped with circuit base plate (5), be equipped with photoelectric conversion chip (6) of array on circuit base plate (5), the top of optical lens (3) is equipped with transparent plate (2), and the scanning process is:

1) the light emitted by the light source (4) is irradiated on the scanned original, and various image-text information on the scanned original generates reflected light and excitation light;

2) part of reflected light and excitation light on the scanned original enter the optical lens (3), and the reflected light and the excitation light coming out from the other end of the optical lens (3) are irradiated on the photoelectric conversion chip (6);

3) the photoelectric conversion chip (6) converts the received optical signal into an electric signal;

4) the relative position of the original and the sensor is moved, the written image-text information is continuously read, and the image information scanning of the original is completed.

2. The line-scan isometric camera of claim 1 wherein said scan is implemented with a low pixel density IC, and wherein: the photoelectric conversion chip (6) and the direction of the main scanning form a fixed included angle.

3. The line-scan isometric camera of claim 2 wherein said scan is implemented with a low pixel density IC, and wherein: the sub-scanning is provided in a vertical direction of the main scanning.

4. The line-scan isometric camera of claim 3 wherein said scan is implemented with a low pixel density IC, and wherein: the pixel density of the sub-scanning is equal to the pixel density of the main scanning.

5. The line-scan isometric camera of claim 3 wherein said scan is implemented with a low pixel density IC, and wherein: and extracting and recombining the actual target object image data after the main scanning and the sub-scanning are finished.

6. The line-scan isometric camera of claim 1 wherein said scan is implemented with a low pixel density IC, and wherein: the number of the photoelectric conversion chips (6) can be increased.

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