CN217957186U - Image sensor with a light-emitting element - Google Patents

Abstract

The utility model provides an image sensor. The image sensor includes: a frame body; the circuit board is arranged in the frame body; the lenses are arranged in the frame body and are arranged at intervals with the circuit board, the lenses are multiple, and the lenses are arranged at intervals along the scanning direction; the photoelectric conversion chips are arranged in a one-to-one correspondence manner with the plurality of lenses; the detection object surface of the image sensor is positioned outside the frame body and on one side of the lens, which is far away from the circuit board, the light source structure is positioned between the frame body and the detection object surface, and the light source structure is obliquely arranged so that light emitted by the light source structure is obliquely irradiated on the detection object surface; the light source structure comprises two rows of light-emitting pieces, each row of light-emitting pieces is multiple, the two rows of light-emitting pieces are arranged in parallel or in an angle mode, and light guide rods are arranged on the light emitting sides of the two rows of light-emitting pieces. The utility model provides an image sensor among the prior art have the regional bright, the dark problem of fringe field in image center.

Description

Image sensor with a plurality of pixels

Technical Field

The utility model relates to an image sensing equipment technical field particularly, relates to an image sensor.

Background

With the advancement of technology and the reduction of cost, machine vision has increasingly increased penetration rate in industry due to its unique advantages. In modern mass production, quality detection of products and quality control in the production process are of great importance, and machine vision equipment can be applied to the industry, such as printing quality detection, appearance detection of mechanical parts, appearance detection of product packages and the like. The machine vision equipment is gradually ascending in the key position of the manufacturing industry due to the advantages of high resolution, high accuracy, high speed, objectivity, repeatability, reliability and the like, so that the intelligent process of industrial development is promoted, and the machine vision equipment has higher market demand.

The types of machine vision equipment are various, and an image sensor is taken as an example, and based on the requirements of the industrial market, an image sensor with multiple lenses for imaging is designed. Due to the lens imaging characteristic of the image sensor and the light emitting characteristic of the matched light source, the collected image presents the condition that the central area is bright and the edge area is dark, so that the difference between the brightness and the darkness of the collected image is large, and great trouble is caused to the subsequent algorithm correction.

That is, the image sensor in the prior art has the problems of bright central area and dark edge area of the image.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide an image sensor to solve the problem that the image sensor in the prior art has bright image center area and dark edge area.

In order to achieve the above object, the present invention provides an image sensor, including: a frame body; the circuit board is arranged in the frame body; the lenses are arranged in the frame body and are arranged at intervals with the circuit board, the lenses are multiple, and the lenses are arranged at intervals along the scanning direction; the photoelectric conversion chips are arranged on the circuit board and positioned on the surface of one side, facing the lens, of the circuit board, the photoelectric conversion chips are multiple, and the multiple photoelectric conversion chips and the multiple lenses are arranged in a one-to-one correspondence mode; the detection object surface of the image sensor is positioned outside the frame body and on one side of the lens, which is far away from the circuit board, the light source structure is positioned between the frame body and the detection object surface, and the light source structure is obliquely arranged so that light emitted by the light source structure is obliquely irradiated on the detection object surface; the light source structure comprises two rows of light-emitting members, each row of light-emitting members is multiple, the two rows of light-emitting members are arranged in parallel or at an angle, and light guide rods are arranged on the light emitting sides of the two rows of light-emitting members.

Furthermore, the angle between the luminous piece and the detection object surface is less than or equal to 20 degrees.

Furthermore, the light source structure is provided with a central line, and the angles between the two rows of light emitting pieces and the central line are the same or different.

Further, the angle between the at least one row of luminous elements and the central line is less than or equal to 10 degrees.

Further, the light source structure further includes: a light source frame; the light source substrate is arranged in the light source frame, the two rows of light-emitting pieces are arranged on the light source substrate, and the two rows of light-emitting pieces are parallel.

Furthermore, the light guide rod is of a round rod structure, and the projection of the round rod structure on the light source substrate covers two rows of light emitting pieces.

Furthermore, imaging areas of two adjacent photoelectric conversion chips on the object detection surface in the plurality of photoelectric conversion chips are at least partially overlapped, the imaging area of each photoelectric conversion chip on the object detection surface is provided with a first edge area and a second edge area, and light emitted by the two columns of light emitting elements is irradiated on the first edge area and the second edge area respectively.

Further, the luminous piece is hemispherical; and/or the light emitting element is an LED; and/or the light emitting area of the light emitting piece is more than or equal to 3.4mm and less than or equal to 3.6mm and 3.6mm.

Furthermore, two adjacent light-emitting members in the plurality of light-emitting members in the same row are arranged at equal intervals, the light-emitting members in different rows are arranged at intervals, and the distance between the two rows of light-emitting members is greater than or equal to 0.6mm and less than or equal to 1mm.

Furthermore, at least two sides of the frame body are provided with light source structures; and/or the distance between the luminous element and the detection object surface is more than or equal to 40mm and less than or equal to 50mm.

By applying the technical scheme of the utility model, the image sensor comprises a frame body, a circuit board, a lens, a photoelectric conversion chip and a light source structure, wherein the circuit board is arranged in the frame body; the lenses are arranged in the frame body and are arranged at intervals with the circuit board, and the lenses are arranged at intervals along the scanning direction; the photoelectric conversion chips are mounted on the circuit board and positioned on the surface of one side of the circuit board, which faces the lens, and are a plurality of chips, and the plurality of photoelectric conversion chips and the plurality of lenses are arranged in one-to-one correspondence; the detection object surface of the image sensor is positioned outside the frame body and on one side of the lens far away from the circuit board, the light source structure is positioned between the frame body and the detection object surface, and the light source structure is obliquely arranged so as to enable light emitted by the light source structure to be obliquely irradiated on the detection object surface; the light source structure comprises two rows of light-emitting members, each row of light-emitting members is multiple, the two rows of light-emitting members are arranged in parallel or at an angle, and light guide rods are arranged on the light emitting sides of the two rows of light-emitting members.

The frame body provides installation space for the circuit board, the lens and the photoelectric conversion chip, so that the circuit board, the lens and the photoelectric conversion chip can be protected by the frame body, stable operation of the circuit board, the lens and the photoelectric conversion chip can be guaranteed, and structural stability is guaranteed. The plurality of lenses are arranged at intervals along the scanning direction, so that the image sensor adopts a mode of splicing the plurality of lenses to scan a strip-shaped image, the scanning area is increased, and the requirement of large-area scanning can be met. The photoelectric conversion chip is carried on the circuit board and is located on one side surface of the circuit board towards the lens, the photoelectric conversion chip is a plurality of chips, the plurality of photoelectric conversion chips and the plurality of lenses are arranged in a one-to-one correspondence mode, the circuit board is enabled to provide a circuit for the photoelectric conversion chip through the arrangement mode, signal transmission is achieved, the plurality of photoelectric conversion chips and the plurality of lenses are arranged in a one-to-one correspondence mode, image information transmitted from the lens can be received by the photoelectric conversion chip, charge accumulation is achieved when the photoelectric conversion chip is used for sensitization, optical signals are converted into electric signals, signal transmission and conversion are achieved, and stability of image transmission is guaranteed. Two lines of light-emitting pieces are arranged in parallel or in an angle mode, the two lines of light-emitting pieces are enabled to be in positions and angles through adjustment of the two lines of light-emitting pieces, main light rays of the two lines of light-emitting pieces are enabled to irradiate on the upper edge area and the lower edge area of a scanned image respectively, two lines of bright area wave crests are formed in the upper edge area and the lower edge area, and a light-emitting mode of dark area wave troughs is formed in the central area, so that the problems that the central area of the scanned image is bright and the edge area of the scanned image is dark are solved. The light-emitting sides of the two rows of the luminous elements are provided with the light guide rods, so that the light guide rods have the function of light condensation, the light emitted by the two rows of the luminous elements can be further converged by the light guide rods, and the light intensity stability is realized.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural diagram of an image sensor in the prior art;

FIG. 2 shows a scanned image of the image sensor of FIG. 1;

FIG. 3 shows a luminescence graph of the light source structure of FIG. 1;

fig. 4 shows a schematic structural diagram of an image sensor according to an alternative embodiment of the present invention;

FIG. 5 shows a graph of the emission of light from the light source structure of FIG. 4;

fig. 6 shows a schematic structural diagram of an image sensor according to another alternative embodiment of the present invention.

Wherein the figures include the following reference numerals:

10. a frame body; 20. a lens; 30. a photoelectric conversion chip; 40. a circuit board; 50. a light source structure; 51. a light source frame; 52. a light source substrate; 53. a light emitting member; 54. a light guide rod; 60. a centerline; 70. detecting an object surface; 71. a central region; 72. a first edge region; 73. a second edge region.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; similarly, "inner and outer" refer to the inner and outer relative to the contours of the components themselves for ease of understanding and description, but the above directional terms are not intended to limit the invention.

As shown in fig. 1 to 3, a related art image sensor is described. Fig. 1 shows a schematic structural diagram of an image sensor in the prior art. The image sensor includes a housing, and structural members are mounted inside the housing. The image sensor also includes two light source structures disposed on either side of the frame to provide light source illumination of a region for the object plane 70. Fig. 2 is a scanned image of the image sensor shown in fig. 1, and as seen from the scanned image, the brightness of the central region 71 is high, and the brightness of the upper edge region and the lower edge region is low, which causes the brightness of the image to be uneven, and makes the subsequent algorithm correction difficult. The cause of this phenomenon is greatly related to the characteristics of the light source structure. Fig. 3 shows a light emission graph of the light source structure of fig. 1, and from the light emission curve effect of fig. 3, the light source structure has the characteristics that the light source brightness of the central region 71 is high and the brightness of the edge portion is low. Therefore, in actual scanning, such characteristics that the brightness of the central area 71 of the scanned image is high and the brightness of the edge area is low are easily caused.

In order to solve the image sensor among the prior art there is the regional bright, the dark problem of marginal area in image center, the utility model provides an image sensor.

As shown in fig. 4 to 6, the image sensor includes a frame 10, a circuit board 40, a lens 20, a photoelectric conversion chip 30, and a light source structure 50, the circuit board 40 being disposed in the frame 10; the lens 20 is arranged in the frame 10 and spaced from the circuit board 40, the plurality of lenses 20 are arranged at intervals along the scanning direction; the photoelectric conversion chips 30 are carried on the circuit board 40 and positioned on the surface of one side of the circuit board 40 facing the lens 20, the photoelectric conversion chips 30 are multiple, and the multiple photoelectric conversion chips 30 and the multiple lenses 20 are arranged in one-to-one correspondence; the detection object surface 70 of the image sensor is positioned outside the frame body 10 and on one side of the lens 20 far away from the circuit board 40, the light source structure 50 is positioned between the frame body 10 and the detection object surface 70, and the light source structure 50 is obliquely arranged so that light emitted by the light source structure 50 obliquely irradiates on the detection object surface 70; the light source structure 50 includes two rows of light emitting members 53, each row of light emitting members 53 is plural, the two rows of light emitting members 53 are arranged in parallel or in an angle, and the light emitting sides of the two rows of light emitting members 53 are provided with light guiding rods 54.

The frame body 10 provides a mounting space for the circuit board 40, the lens 20 and the photoelectric conversion chip 30, so that the circuit board 40, the lens 20 and the photoelectric conversion chip 30 can be protected by the frame body 10, thereby ensuring that the circuit board 40, the lens 20 and the photoelectric conversion chip 30 can stably operate and ensuring the structural stability. The plurality of lenses 20 are arranged at intervals along the scanning direction, so that the image sensor of the application adopts a mode of splicing the plurality of lenses 20 to realize the scanning of a strip-shaped image, the scanning area is increased, and the requirement of large-area scanning can be met. The photoelectric conversion chip 30 is carried on the circuit board 40 and is positioned on the surface of one side of the circuit board 40 facing the lens 20, the photoelectric conversion chip 30 is multi-chip, the multi-chip photoelectric conversion chip 30 and the plurality of lenses 20 are arranged in a one-to-one correspondence manner, so that the circuit board 40 provides a circuit for the photoelectric conversion chip 30 to realize signal transmission, the multi-chip photoelectric conversion chip 30 and the plurality of lenses 20 are arranged in a one-to-one correspondence manner, so that the photoelectric conversion chip 30 can receive image information transmitted from the lenses 20, the photoelectric conversion chip 30 is used for accumulating charges while being sensitive to light, optical signals are converted into electrical signals, signal transmission and conversion are realized, and the stability of image transmission is ensured. The two lines of light-emitting members 53 are arranged in parallel or in an angle, and the positions and the angles of the two lines of light-emitting members 53 are adjusted, so that main light rays of the two lines of light-emitting members 53 respectively irradiate the upper edge area and the lower edge area of a scanned image, two lines of light area wave crests are formed in the upper edge area and the lower edge area, and the central area 71 forms a light-emitting form of a dark area wave trough, so that the problems of light in the central area 71 and dark in the edge area of the scanned image are solved. The light-emitting sides of the two rows of the light-emitting members 53 are provided with the light guide rods 54, so that the light guide rods 54 can perform the light condensing function, the light emitted by the two rows of the light-emitting members 53 can be further condensed by the light guide rods 54, and the light intensity is stable.

It should be noted that the frame 10 is preferably made of a metal material, such as AL, to increase the heat dissipation effect. Each photoelectric conversion chip 30 is in the direction in which the optical axis of the corresponding lens 20 extends, so as to ensure stability of image transmission. The light source structure 50 further includes an oxide coating, the outer wall surface of the light source frame 51 is provided with an oxide coating, the oxide coating is a white oxide coating, and by setting the white oxide coating, the light emitting effect of the light source structure 50 can be improved, and the brightness is improved. The lens 20 is preferably an image that is reduced in a certain ratio. Any two adjacent ones of the above photoelectric conversion chips 30 are at least partially connected in the imaging region in the above scanning direction.

As shown in fig. 4, the light source structure 50 is disposed on two sides of the frame 10 to provide a light source illumination of a certain area for the object detection surface 70.

As shown in fig. 4, the light source structure 50 further includes a light source frame 51 and a light source substrate 52, the light source substrate 52 is disposed in the light source frame 51, two rows of light emitting members 53 are disposed on the light source substrate 52, and the light source substrate 52 provides a circuit for the two rows of light emitting members 53 to ensure that the two rows of light emitting members 53 can stably emit light and the two rows of light emitting members 53 are parallel to each other. The arrangement direction of the two rows of light emitting elements 53 extending along the scanning direction of the light source structure 50 is the same as the scanning direction. The number of the light emitting members 53 in different columns may be the same or different, and the light emitting members are arranged according to specific situations; the two rows of light emitting members 53 may be spaced or not spaced. The light source structure 50 has a center line 60, and the angles between the two rows of light-emitting members 53 and the center line 60 are the same or different. That is, the light emitting angles and the light emitting positions of the two rows of light emitting members 53 in the light source frame 51 can be adjusted to ensure that the two rows of light emitting members 53 just correspond to the upper and lower edge regions of the scanned image respectively when being emitted onto the scanned object surface, so as to increase the brightness of the edge regions.

Specifically, imaging areas of two adjacent photoelectric conversion chips 30 in the plurality of photoelectric conversion chips 30 on the object detection surface 70 are at least partially overlapped, an imaging area of each photoelectric conversion chip 30 on the object detection surface 70 has a first edge area 72 and a second edge area 73, and light emitted by two rows of light emitting elements 53 is respectively irradiated on the first edge area 72 and the second edge area 73. That is, one of the two rows of light-emitting members 53 emits light corresponding to the first edge region 72, and the other of the two rows of light-emitting members 53 emits light corresponding to the second edge region 73, so as to compensate for the brightness of the light in the edge regions.

The light emitting members 53 in two rows are arranged at equal intervals, that is, the intervals between any two adjacent light emitting members 53 in the plurality of light emitting members 53 in the same row are equal. The light emitting members 53 in different rows are spaced apart, and the distance between the light emitting members 53 in two rows is greater than or equal to 0.6mm and less than or equal to 1mm. By reasonably restricting the distance between the two rows of light-emitting members 53, the two rows of light-emitting members 53 are ensured to be separately arranged and independently work, and meanwhile, the phenomenon that the distance between the two rows of light-emitting members 53 is too small or too large to correspond to two edge areas of a scanned image can be avoided, and the use reliability of the two rows of light-emitting members 53 is ensured.

Specifically, the light emitting member 53 is C3535, the light emitting member 53 is hemispherical, the light emitting member 53 is an LED, the light emitting area of the light emitting member 53 is 3.4mm × 3.4mm and 3.6mm × 3.6mm or less, and the light emitting area of the light emitting member 53 is 3.5mm × 3.5mm in this embodiment. The shape of the type of the light emitting member 53 is selected reasonably, so that the light emitting area of the light emitting member 53 meets the application requirement, and the light condensing effect can be further achieved.

As shown in fig. 4, the light source substrate 52 is made of aluminum, so as to increase the heat dissipation effect. The light guide rod 54 is of a round rod structure, a round rod structure is additionally arranged on the light emitting sides of the two rows of light emitting parts 53, and the corresponding round rod structure converges certain light rays to achieve the light condensation effect. Preferably, the diameter of the circular rod structure is equal to or larger than the light emitting areas of the two rows of light emitting elements 53, and the projection of the circular rod structure on the light source substrate 52 may be understood to cover the two rows of light emitting elements 53. The material of the round rod structure is preferably optical material with good light transmission such as quartz glass, so as to ensure the light transmission of the round rod structure.

In practice, as shown in fig. 4, the light emitted from the two rows of light-emitting members 53 passes through the circular bar structure, and the main light is irradiated to the first edge region 72 and the second edge region 73, respectively. In this way, a region with high luminance is formed in the first edge region 72 and the second edge region 73, and a region with low luminance is formed in the center region 71. Meanwhile, the two light source structures 50 are symmetrically irradiated on two sides, so that the condition that the two rows of light emitting elements 53 have different brightness due to different optical paths can be further compensated. Preferably, the distance between the light emitting members 53 and the object plane 70 is greater than or equal to 40mm and less than or equal to 50mm, and the angle between the light emitting members 53 and the object plane 70 is less than or equal to 20 °, so as to ensure that the two rows of light emitting members 53 can accurately correspond to the two edge areas. Furthermore, the current of the LEDs can be better adjusted in a pulse control mode to adjust the light emitting brightness of the two rows of LEDs.

As shown in fig. 5, a light-emitting graph of the light source structure 50 of the image sensor of fig. 4 is formed, from the graph, with two rows of peaks at the edge and a light-emitting form with a valley at the center, so as to solve the problem that the central area 71 of the scanned image is bright and the edge area is dark.

Fig. 6 shows another alternative embodiment of the image sensor of the present application. The difference from the image sensor in the above-mentioned embodiment is that the light emitting angles of the two rows of light emitting members 53 can be further adjusted. By adjusting the light emission angle, the two rows of light emitting members 53 can be adjusted to irradiate the region of the effective position of the object detection surface 70. The angle between at least one row of the luminous elements 53 and the center line 60 is less than or equal to 10 degrees, or the angles between two rows of the luminous elements 53 and the center line 60 are less than or equal to 10 degrees. By adjusting the light emitting angles of the two rows of light emitting elements 53, the light source structure 50 can be further brought closer to the object plane 70, so as to further improve the brightness of the object plane 70.

It is to be understood that the above-described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An image sensor, comprising:

a frame body (10);

a circuit board (40), the circuit board (40) being disposed within the frame (10);

the lens (20) is arranged in the frame body (10) and is arranged at intervals with the circuit board (40), the number of the lenses (20) is multiple, and the lenses (20) are arranged at intervals along the scanning direction;

the photoelectric conversion chips (30) are carried on the circuit board (40) and positioned on the surface of one side, facing the lens (20), of the circuit board (40), the photoelectric conversion chips (30) are multiple, and the photoelectric conversion chips (30) and the lenses (20) are arranged in a one-to-one correspondence manner;

the detection object surface (70) of the image sensor is positioned outside the frame body (10) and on one side of the lens (20) far away from the circuit board (40), the light source structure (50) is positioned between the frame body (10) and the detection object surface (70), and the light source structure (50) is obliquely arranged so that light emitted by the light source structure (50) obliquely irradiates on the detection object surface (70); light source structure (50) are including two rows of illuminating part (53), and every row illuminating part (53) are a plurality ofly, two are parallel or be angle setting between illuminating part (53), two are the light-emitting side of illuminating part (53) has leaded light stick (54).

2. The image sensor according to claim 1, wherein an angle between the light emitting member (53) and the detection object plane (70) is 20 ° or less.

3. The image sensor according to claim 1, wherein the light source structure (50) has a center line (60), and the angles between the two rows of the light emitting members (53) and the center line (60) are the same or different.

4. An image sensor as claimed in claim 3, characterized in that the angle between the at least one column of light-emitting elements (53) and the centre line (60) is less than or equal to 10 °.

5. The image sensor of claim 1, wherein the light source structure (50) further comprises:

a light source frame (51);

the light source frame (51) is provided with a light source substrate (52), the light source substrate (52) is arranged in the light source frame (51), two rows of the light emitting pieces (53) are arranged on the light source substrate (52), and the two rows of the light emitting pieces (53) are parallel.

6. The image sensor according to claim 5, wherein the light guide rod (54) is a circular rod structure, and a projection of the circular rod structure on the light source substrate (52) covers two rows of the light emitting members (53).

7. The image sensor according to claim 1, wherein imaging regions of adjacent two of the photoelectric conversion chips (30) on the object plane (70) at least partially overlap, each imaging region of each photoelectric conversion chip (30) on the object plane (70) has a first edge region (72) and a second edge region (73), and light emitted by two columns of the light emitting members (53) is irradiated on the first edge region (72) and the second edge region (73), respectively.

8. The image sensor of claim 1,

the luminous piece (53) is hemispherical; and/or

The light emitting member (53) is an LED; and/or

The light emitting area of the light emitting piece (53) is larger than or equal to 3.4mm and smaller than or equal to 3.6mm and 3.6mm.

9. The image sensor according to claim 1, wherein adjacent two of the light emitting members (53) in the plurality of light emitting members (53) in the same column are arranged at equal intervals, the light emitting members (53) in different columns are arranged at intervals, and a distance between two columns of the light emitting members (53) is greater than or equal to 0.6mm and less than or equal to 1mm.

10. The image sensor according to any one of claims 1 to 9,

the light source structures (50) are arranged on at least two sides of the frame body (10); and/or

The distance between the luminous piece (53) and the detection object surface (70) is more than or equal to 40mm and less than or equal to 50mm.

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