KR20230118477A - Photographing module for vision inspection - Google Patents

Abstract

According to the present invention, in order to achieve the above object of the present invention, the circuit board; a plurality of image sensors mounted on the front surface of the circuit board; a plurality of lenses disposed in a one-to-one correspondence in front of each of the plurality of image sensors; a housing accommodating the circuit board therein; a plurality of lens barrels in which each of the plurality of lenses is installed; and a lens aligning member coupled to the circuit board and to which the plurality of lens barrels are coupled, wherein each of the plurality of lenses provides a different focal length to the corresponding image sensor and is coupled to the lens barrel to provide the corresponding image sensor. A photographing module for vision inspection in which a distance to a sensor is fixed is provided.

Description

Photography module for vision inspection {PHOTOGRAPHING MODULE FOR VISION INSPECTION}

The present invention relates to a vision inspection technology, and more particularly, to a photographing module for photographing an inspection object in a vision inspection.

In general, vision inspection refers to inspecting the shape, size, foreign matter, damage, etc. by photographing an inspection object to determine whether or not defects are present in various parts of the inspection object. As the characteristics of inspection objects diversify according to industrialization structure changes, it is becoming more and more difficult to respond immediately to the depth of field in vision inspection. Depth of field refers to the range in the distance in which the photographed subject has an acceptable level of sharpness. To improve the depth of field in vision inspection, a method of adjusting the focal length of the lens of the photographing part is generally used. The focal length of a lens is usually adjusted by physically moving the position of the lens or changing the shape of the lens. However, since this conventional lens focal length control method takes time to move or deform the lens, it acts as a factor that increases inspection time. As a background technology for the photographic module for vision inspection, which is the technical field of the present invention, Registration Patent No. 10-2360140 discloses a camera module having a driving member such as a small motor that drives to adjust the position of a lens provided in a camera. The composition of is described.

Korean Registered Patent Publication No. 10-2284121 (2021.07.30)

An object of the present invention is to provide a photographing module for vision inspection that enables rapid acquisition of an accurate image of an object to be inspected in a vision inspection.

In order to achieve the above object of the present invention, according to an aspect of the present invention, the circuit board; a plurality of image sensors mounted on the front surface of the circuit board; a plurality of lenses disposed in a one-to-one correspondence in front of each of the plurality of image sensors; a housing accommodating the circuit board therein; a plurality of lens barrels in which each of the plurality of lenses is installed; and a lens aligning member coupled to the circuit board and to which the plurality of lens barrels are coupled, wherein each of the plurality of lenses provides a different focal length to the corresponding image sensor and is coupled to the lens barrel to provide the corresponding image sensor. A photographing module for vision inspection in which a distance to a sensor is fixed is provided.

According to the present invention, all of the objects of the present invention described above can be achieved. Specifically, the photographing module for vision inspection according to the present invention includes a plurality of image sensors and a plurality of lenses installed in a one-to-one correspondence with each of the plurality of image sensors, and each of the plurality of lenses is provided with respect to an object to be inspected. Since different focal lengths are provided, it is possible to obtain clear images of the entire range of the inspection object at the same time. Accordingly, the time required for focus adjustment in the conventional method is reduced and productivity is improved by omitting individual photographing time.

1 is a perspective view of a photographing module for vision inspection according to an embodiment of the present invention.
FIG. 2 is an exploded perspective view of the imaging module for vision inspection shown in FIG. 1 .
FIG. 3 is an exploded perspective view of a photographing body in the photographing module for vision inspection shown in FIG. 2 .
FIG. 4 is a diagram explaining a principle of photographing an object to be inspected by a photographing unit in the photographing module for a vision inspection shown in FIG. 2 .

Hereinafter, the configuration and operation of an embodiment of the present invention will be described in detail with reference to the drawings. 1 is a perspective view of the imaging module for vision inspection according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the imaging module for vision inspection shown in FIG. 1 . 1 and 2, the photographing module 100 for vision inspection according to an embodiment of the present invention includes a photographing body 110 that substantially performs a function of acquiring an image of an object to be inspected in a vision inspection; A housing 170 accommodating and protecting the photographing body 110 is included.

The photographing body 110 substantially performs a function of acquiring an image of an object to be inspected in a vision inspection. 3 shows the photographing body 110 as an exploded perspective view. 1 to 3, the photographing body 110 is mounted on a circuit board 111, a photographing unit 120 for obtaining analog image data for an object to be inspected as a subject, and a circuit board 111, and is photographed. An image processing semiconductor device (not shown) processing analog image data transmitted from the unit 120, and a heat dissipation unit 160 fixed to the circuit board 111 and dissipating heat generated from the image processing semiconductor device (not shown) ) is provided.

The circuit board 111 is a flat plate having a typical PCB structure, and is fixed to the housing 170 while being received inside the housing 170 . A photographing unit 120 is positioned on the front surface 112 of the circuit board 111 and an image processing semiconductor device 150 is mounted. Although not shown, a power decision terminal, a memory connection port, an external device connection port, and a communication connection port are mounted on the rear surface 113 of the circuit board 111.

The photographing unit 120 acquires analog image data of the object to be inspected. 4 illustrates a photographing principle of an object to be examined by the photographing unit 120 . 1 to 4, the photographing unit 120 includes a plurality of image sensors 121, 122, 123, and 124 mounted on a circuit board 111, and a plurality of image sensors 121, 122, 123, 124) and a plurality of lens units (131, 132, 133, 134) disposed in correspondence with each other, fixed to the circuit board 111 and positioning the plurality of lens units (131, 132, 133, 134) A lens alignment member 140 is provided.

The plurality of image sensors 121 , 122 , 123 , and 124 are mounted on the front surface 112 of the circuit board 111 . Each of the plurality of image sensors 121, 122, 123, and 124 is a semiconductor device that converts input light into an analog electrical signal and outputs it, and may be a charge coupled device (CCD). An analog electrical signal output from each of the plurality of image sensors 121 , 122 , 123 , and 124 is input to the image processing semiconductor device 150 . In this embodiment, four image sensors 121, 122, 123, and 124 are mounted on the circuit board 111, but the present invention is not limited thereto. Two, three, or five or more image sensors may be mounted on the circuit board 111, which also falls within the scope of the present invention. The four image sensors 121, 122, 123, and 124 are arranged to be adjacent to each other, and in this embodiment, they are described as being respectively disposed at positions corresponding to vertices of a square. One of the four image sensors 121, 122, 123, and 124 is referred to as the first image sensor 121, the other is referred to as the second image sensor 122, and the other is referred to as the third image sensor 123. ), and the other one is referred to as the fourth image sensor 124 .

Each of the plurality of lens units 131 , 132 , 133 , and 134 is disposed to correspond to each of the plurality of image sensors 121 , 122 , 123 , and 124 . In this embodiment, there are four lens units 131 , 132 , 133 , and 134 , and each is disposed in one-to-one correspondence with each of the four image sensors 121 , 122 , 123 , and 124 . Accordingly, the four lens units 131, 132, 133, and 134 are also disposed at positions corresponding to vertices of the square corresponding to positions of the four image sensors 121, 122, 123, and 124, respectively. Among the four lens units 131, 132, 133, and 134, one disposed corresponding to the first image sensor 121 is referred to as a first lens unit 131, and one disposed corresponding to the second image sensor 122 The second lens unit 132 is referred to as the second lens unit 132, the third lens unit 133 is disposed corresponding to the third image sensor 123, and the fourth lens is disposed corresponding to the fourth image sensor 124. It is referred to as unit 134. The four lens units 131 , 132 , 134 , and 134 are coupled to the lens aligning member 140 to be positioned on the corresponding image sensors 121 , 122 , 123 , and 124 .

The first lens unit 131 includes a first lens 131a and a first barrel 131b in which the first lens 131a is installed.

The first lens 131a provides a first focal length L1 to the first image sensor 121 . The first lens 131a is coupled to the first barrel 131b such that the first lens distance M1, which is the distance between the first image sensor 121 and the first lens 131a, is maintained constant. The first focal length L1 is the distance between the first focal point P1 of the first lens 131a and the first lens 131a. The first lens 131a provides a first depth of field D1.

The first lens barrel 131b is coupled to the lens aligning member 140 to properly position the first lens 131a installed in the first barrel 131b with respect to the first image sensor 121 .

The second lens unit 132 includes a second lens 132a and a second barrel 132b in which the second lens 132a is installed.

The second lens 132a provides a second focal length L2 to the second image sensor 122 . The second lens 132a is coupled to the second barrel 132b such that the second lens distance M2, which is the distance between the second image sensor 122 and the second lens 132a, is maintained constant. The second focal length L2 is the distance between the second focal point P2 by the second lens 132a and the second lens 132a. The second focal length L2 provided by the second lens 132a is greater than the first focal length L1 provided by the first lens 131a. To this end, in this embodiment, it will be described that the second lens 132a has a shape different from that of the first lens 131a and at the same time the second lens distance M2 is set to be different from the first lens distance M1. Unlike this, in a state where the second lens distance M2 and the first lens distance M1 are the same, the second lens 132a may have a shape different from that of the first lens 131a, or the second lens 132a may have the same shape as the first lens 132a. It has the same shape as the first lens 131a and the second lens distance M2 may be set differently from the first lens distance M1, which also falls within the scope of the present invention. The second lens 132a provides a second depth of field D2. The first depth of field D1 and the second depth of field D2 are overlapped over a partial section C1-2 on the optical axis in the distance direction.

The second lens barrel 132b is coupled to the lens aligning member 140 to properly position the second lens 132a installed in the second barrel 132b with respect to the second image sensor 122 . When the second lens distance M2 is equal to the first lens distance M1 and the second lens 132a has a shape different from that of the first lens 131a, the length of the second barrel 132b is It may be the same as the length of one barrel 131b.

The third lens unit 133 includes a third lens 133a and a third barrel 133b in which the third lens 133a is installed.

The third lens 133a provides a third focal length L3 to the third image sensor 123 . The third lens 133a is coupled to the third lens barrel 133b so that the third lens distance M3, which is the distance between the third image sensor 123 and the third lens 133a, is maintained constant. The third focal length L3 is the distance between the third focal point P3 by the third lens 133a and the third lens 133a. The third focal length L3 provided by the third lens 133a is greater than the second focal length L2 provided by the second lens 132a. To this end, in this embodiment, it will be described that the third lens 133a has a shape different from that of the second lens 132a and at the same time the third lens distance M3 is set to be different from the second lens distance M2. In contrast, in a state where the third lens distance M3 is the same as the second lens distance M2, the third lens 133a may have a shape different from that of the second lens 132a, or the third lens 133a may have the same shape as the second lens distance M2. It has the same shape as the second lens 132a, and the third lens distance M3 may be set differently from the second lens distance M2, which also falls within the scope of the present invention. The third lens 133a provides a third depth of field D3. The second depth of field D2 and the third depth of field D3 are overlapped over a partial section C2-3 on the optical axis in the distance direction.

The third lens barrel 133b is coupled to the lens aligning member 140 to properly position the third lens 133a installed in the third barrel 133b with respect to the third image sensor 123 . When the third lens distance M3 is equal to the second lens distance M2 and the third lens 133a has a different shape from the second lens 132a, the length of the third barrel 133b is The lengths of the first and second barrels 131b and 132b may be the same.

The fourth lens unit 134 includes a fourth lens 134a and a fourth barrel 134b in which the fourth lens 134a is installed.

The fourth lens 134a provides a fourth focal length L4 to the fourth image sensor 124 . The fourth lens 134a is coupled to the fourth barrel 134b so that the fourth lens distance M4, which is the distance between the fourth image sensor 124 and the fourth lens 134a, is maintained constant. The fourth focal length L4 is the distance between the fourth focal point P4 by the fourth lens 134a and the fourth lens 134a. The fourth focal length L4 provided by the fourth lens 134a is greater than the third focal length L3 provided by the third lens 133a. To this end, in this embodiment, it will be described that the fourth lens 134a has a different shape from the third lens 133a and the fourth lens distance M4 is set to be different from the third lens distance M3. Unlike this, in a state where the fourth lens distance M4 is the same as the third lens distance M3, the fourth lens 134a has a shape different from that of the third lens 133a, or the fourth lens 134a has the same shape as the third lens distance M3. It has the same shape as the third lens 133a, and the fourth lens distance M4 may be set differently from the third lens distance M3, which also falls within the scope of the present invention. The fourth lens 134a provides a fourth depth of field D4. The third depth of field D3 and the fourth depth of field D4 are overlapped over a partial section C3-4 on the optical axis in the distance direction.

The fourth lens barrel 134b is coupled to the lens aligning member 140 to properly position the fourth lens 134a installed in the fourth barrel 134b with respect to the fourth image sensor 124 . When the fourth lens distance M4 is equal to the third lens distance M3 and the fourth lens 134a has a shape different from that of the third lens 133a, the length of the fourth barrel 134b is The lengths of the first barrel 131b, the second barrel 132b, and the third barrel 133b may be the same.

The lens aligning member 140 is coupled to be fixed to the front surface 112 of the circuit board 111, and the image sensors 121, 122, 123, and 124 corresponding to the plurality of lens units 131, 132, 133, and 134 Place them in the front of each. The lens alignment member 140 includes a base portion 141 coupled to the circuit board 111 and a protrusion 145 protruding from the base portion 141 .

The base portion 141 is coupled to the circuit board 111 by screw coupling so as to cover an area including the four image sensors 121, 122, 123, and 124 mounted on the front surface 112 of the circuit board 111. do.

The protruding portion 145 protrudes from the base portion 141 in an area including the four image sensors 121 , 122 , 123 , and 124 . The protruding portion 145 includes a front plate portion 146 and a side wall portion 148 . The front plate portion 146 has a flat plate shape and is substantially parallel to a plane on which the four image sensors 121, 122, 123, and 124 are disposed. Four through-holes 147a, 147b, 147c, and 147d are formed in the front plate portion 146 to correspond to positions of the four image sensors 121, 122, 123, and 124, respectively. Of the four through-holes 147a, 147b, 147c, and 147d, one positioned corresponding to the first image sensor 121 is referred to as a first through-hole 147a, and one positioned corresponding to the second image sensor 122 is referred to as a first through-hole 147a. The one positioned corresponding to the third image sensor 123 is referred to as the third through hole 147c, and the one positioned corresponding to the fourth image sensor 124 is referred to as the fourth through hole 147b. It is called sphere 147d.

The first barrel 131b is coupled while passing through the first through hole 147a. Although not shown, a female screw is formed in the first through hole 147a and a male screw is formed in the first barrel 131b so that the first barrel 131b can be screwed into the first through hole 147a.

The second barrel 132b is coupled while passing through the second through hole 147b. Although not shown, a female screw is formed in the second through hole 147b and a male screw is formed in the second barrel 132b so that the second barrel 132b can be screwed into the second through hole 147b.

The third barrel 133b is coupled while passing through the third through hole 147c. Although not shown, a female screw is formed in the third through hole 147c and a male screw is formed in the third barrel 133b so that the third barrel 133b can be screwed into the third through hole 147c.

The fourth barrel 134b is coupled while passing through the fourth through hole 147d. Although not shown, a female screw is formed in the fourth through hole 147d and a male screw is formed in the fourth barrel 134b so that the fourth barrel 134b can be screwed into the fourth through hole 147d.

The photographing unit 120 captures the inspection object A once, and at the same time, the first photographed image acquired by the first image sensor 121 and the second photographed image obtained by the second image sensor 122 are captured. , the third captured image acquired by the third image sensor 123 and the fourth captured image acquired by the fourth image sensor 124 are provided. Since each photographed image provides a clear image at the subject depth set for the object A to be inspected, a clear image of the entire range of the object A can be obtained with one shot. Through separate image processing for each of the captured images, sharp parts of each of the captured images may be combined and merged into a single integrated image, which also falls within the scope of the present invention.

An image processing semiconductor device (not shown) is mounted on the front surface 112 of the circuit board 111 and processes image data transmitted from the plurality of image sensors 121 , 122 , 123 , and 124 . An image processing semiconductor device (not shown) may be composed of a typical CPU (Central Processing Unit) and GPU (Graphic Processing Unit).

The heat dissipation unit 160 is installed to be fixed to the circuit board 111 to dissipate heat generated from an image processing semiconductor device (not shown) mounted on the circuit board 111 . The heat dissipation unit 160 includes a heat sink 161 and a cooling fan 165 .

The housing 170 accommodates and protects the photographing body 110 . The housing 170 includes a first housing part 180 and a second housing part 190 . The first housing part 180 and the second housing part 190 are screwed together to form the housing 170 .

The first housing part 180 is disposed to cover the photographing body 110 on the front surface 112 of the circuit board 111 . An opening 181 exposing the protrusion 145 of the lens aligning member 140 is formed in the first housing part 180 . A plurality of lenses 131a, 132a, 133a, and 134a are exposed through the opening 181 . An exhaust port 185 is formed in the first housing part 180 . Gas is discharged to the outside of the housing 170 by the heat dissipation unit 160 through the exhaust port 185 .

The second housing part 190 is disposed on the rear surface 113 of the circuit board 111 to cover the photographing body 110 . The second housing part 190 is combined with the first housing part 180 to form the housing 170 .

Although the present invention has been described through the above examples, the present invention is not limited thereto. The above embodiments may be modified or changed without departing from the spirit and scope of the present invention, and those skilled in the art will recognize that such modifications and changes also belong to the present invention.

100: filming module for vision inspection 110: filming body
111: circuit board 120: shooting unit
121: first image sensor 122: second image sensor
123: third image sensor 124: fourth image sensor
131: first lens unit 131a: first lens
131b: first lens barrel 132: second lens unit
132a: second lens 132b: second lens barrel
133: third lens unit 133a: third lens
133b: third barrel 134: fourth lens unit
134a: fourth lens 134b: fourth lens barrel
140: lens alignment member 147a: first through hole
147b: second through hole 147c: third through hole
147d: fourth through hole 160: heat dissipation unit
170: housing

Claims (7)

circuit board;
a plurality of image sensors mounted on the front surface of the circuit board;
a plurality of lenses disposed in a one-to-one correspondence in front of each of the plurality of image sensors;
a housing accommodating the circuit board therein;
a plurality of lens barrels in which each of the plurality of lenses is installed; and
A lens alignment member coupled to the circuit board and coupled to the plurality of lens barrels;
Each of the plurality of lenses provides a different focal length to the corresponding image sensor, and is coupled to the lens barrel so that the distance to the corresponding image sensor is fixed.
Filming module for vision inspection. The method of claim 1,
The lens alignment member is formed with a plurality of through-holes through which each of the plurality of lens barrels passes.
Filming module for vision inspection. The method of claim 1,
All of the plurality of lenses have different shapes, and the distances formed by each of the plurality of lenses from the corresponding image sensor are all different.
Filming module for vision inspection. The method of claim 1,
All of the plurality of lenses have the same shape, and the distances formed by each of the plurality of lenses from the corresponding image sensor are all different.
Filming module for vision inspection. The method of claim 1,
All of the plurality of lenses have different shapes, and the distances between the plurality of lenses and the corresponding image sensor are all formed the same.
Filming module for vision inspection. The method of claim 1,
Each of the plurality of lenses arranges the focal lengths along the distance direction,
Filming module for vision inspection. The method of claim 6,
The depth of subject of each of the two lenses providing two adjacent focal lengths among the plurality of lenses, respectively, overlaps in some section along the distance direction.
Filming module for vision inspection.

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