LU502748B1 - Optical design system, shooting method and controller based on tablet visual inspection - Google Patents

Abstract

The application discloses an optical design system, a lighting and shooting method and a controller based on tablet visual detection, and relates to the technical field of tablet and its packaging defect detection and visual optical design. The test objects are tablets, their packaging substrates, aluminum foil plates, and blisters that wrap the tablets. The optical design system based on tablet vision detection also comprises a first lighting unit and a first shooting unit; a second lighting unit and a second shooting unit; a third lighting unit and a third shooting unit; a fourth lighting unit and a fourth shooting unit; a fifth lighting unit and a fifth shooting unit; the control unit is connected with the first lighting unit, the second lighting unit, the third lighting unit, the fourth lighting unit and the fifth lighting unit respectively.

Description

DESCRIPTION LU502748

OPTICAL DESIGN SYSTEM, SHOOTING METHOD AND

CONTROLLER BASED ON TABLET VISUAL INSPECTION

TECHNICAL FIELD

The application belongs to the technical field of tablet and its packaging defect detection and visual optical design, in particular to an optical design system, a lighting and shooting method and a controller based on tablet visual detection.

BACKGROUND

At present, there are many complex working procedures in the production and packaging process of tablets. Each working procedure may produce corresponding kinds of defects in the process of production and transportation. All kinds of defects can affect the drug product appearance in mild cases and the life safety of patients in severe cases, so it is very important for the quality detection of tablets.

However, manual or semi-automatic detection is not conducive to improving the detection efficiency and ensuring the detection accuracy due to uncertainty of personnel, and the existing optical scheme based on visual detection also has some limitations. For example, in the existing tablet detection patent, the following shooting scheme is adopted: an area array camera is used for shooting the upper surface of a tablet which is positioned on a tablet tray and is in a static state, defects are identified, and defective products are removed.

It can be found that in the existing scheme, an area array camera is used to photograph the upper surface from above, so that a blind area is formed on the side surface of the tablet and the back surface of the tablet substrate, so that an area for shooting the tablet is incomplete, and a large number of missed detection phenomena are easily caused. In addition, the detection efficiency 1s lower, the production beat of the medicine cannot be met, and the production efficiency is affected.

Therefore, there is an urgent need for an automatic optical design system for taking pills, which can save labor, reduce labor intensity, maintenance costs and potential risks. Improve shooting accuracy and detection speed.

Through the above analysis, the existing problems and defects of the prior art are as follows:

(1) In the prior art, the picture information of each outer surface required for tablet quality, 5027 48 detection 1s not comprehensive, resulting in low defect detection rate. (2) In the prior art, the tablet production line cannot realize classification and elimination of defects and cannot complete automatic image acquisition. (3) In the prior art, aiming at the obvious characteristics that the optical environment of the tablets cannot be clearly reflected, the detection precision of a later algorithm is reduced.

The difficulty to solve the above problems and defects is: (1) For the tablet quality detection, we need to combine the optical knowledge and the shape of the tablets to build the environment and place the camera position and pose, so as to further get a clear defect image, which is convenient for the later algorithm detection. (2) In the prior art, the rapid removal station cannot be realized, and the defects of products can be classified and removed, which is convenient to provide reference for process optimization in the later stage.

The significance of solving the above problems and defects is as follows: (1) Through the existing scheme, the comprehensive defect detection of the tablet product is realized, and the automatic elimination and classification are realized according to the types of defects, so that a reference basis is provided for later process optimization. (2) The detection precision of the tablets is improved, and unqualified products are prevented from flowing into the consumption market, thus causing secondary injury to patients.

SUMMARY

In order to overcome the problems existing in the related art, the disclosed embodiment of the application provides an optical design system, a lighting and shooting method based on tablet visual detection. The technical scheme is as follows:

According to the first aspect of the disclosed embodiment of the application, an optical design system based on tablet visual detection is provided, the detection objects are tablets, aluminum foil plates of a packaging substrate of the tablets and blisters for wrapping the tablets; along with the movement of a conveyor belt, samplesare driven to pass through a first station, a second station, a third station, a fourth station and a fifth station, and the optical design system based on tablet visual detection further comprises a shooting system; the shooting system comprises:

A first lighting unit, comprises a large-diameter annular light source, the diameter of the light source is determined according to the detection tablet substrate, and the diameter of the, 5027 48 light source is 1.5-3 times that of the tablet substrate, which is used for uniformly lighting the back surface of the tablet substrate;

a first shooting unit, comprises a color camera and a lens, and is used for shooting the defects of yellowing, whitening and breakage of the aluminum foil on the back of tablet substrate, and the defects of reprinting, skip printing and misprinting of the production batch number;

a first removing station, for removingthe defects of yellowing, whitening and breakage of the aluminum foil on the back of the tablet substrate, and the defects of reprinting, skip printing and misprinting of the production batch number;

a second lighting unit, comprises an area light source, and is used for providing a backlight source for shooting the back surface of the tablet substrate;

a second shooting unit, comprises a black-and-white camera and a lens, and is used for shooting the aluminum foil crack damage defect on the back surface of the tablet substrate;

a second removing station, for removing the crack and damage defect of the aluminum foil on the back of the tablet substrate;

a third lighting unit, comprises a large-caliber coaxial light source, the diameter of the light source is determined according to the detection tablet substrate, and the diameter of the light source is 1 .5-3 times that of the tablet substrate, and is used for uniformly illuminating the front surface of the tablet substrate, the front surface of the tablet and the reinforcing rib area;

a third shooting unit, comprises a color camera and a lens, and is used for shooting foreign matters, broken grain defects, reinforcing rib foreign matters, breakage defects, aluminum foil breakage on the front surface of the tabletsubstrate, and reticulated hollow defects on the front surface of the tablet;

a third removing station, for removingforeign matters, broken grain defects, reinforcing rib foreign matters, breakage defects, aluminum foil breakage on the front surface of the tabletsubstrate, and reticulated hollow defects on the front surface of the tablet;

a fourth lighting unit, comprises a large-diameter annular light source, the diameter of the light source is determined according to the detection of thetabletsubstrate, the diameter of the light source is 1.5-3 times of that of thetabletsubstrate, the light source is used for illuminating the front surface of the tablet substrate, uniformly illuminating the front aluminum foil so that the front aluminum foil does not reflect light, and illuminating the surfaces of blisters so that the surfaces of the blisters have regular reflection light; LU502748 a fourth shooting unit, comprises a color camera and a lens, and is used for shooting the reflection on the surface of each blister and detecting the deformation defect of the blister according to the reflection; a fourth removing station, for removing the reflection on the surface of the blisters and detecting the deformation defect of the blister according to the reflection; a fifth lighting unit, comprises a small-diameter annular light source, the diameter of the light source is determined according to the detection tabletsubstrate, and the diameter of the light source is 1-2 times that of the tablet substrate, and 1s used for illuminating the periphery of the tablet and making the front substrate aluminum foil not reflect light; a fifth shooting unit, comprises a plurality of groups of color cameras and short-focus lenses, and is used for shooting foreign matters around the tablets and defects of tablet fragments and laminations; a fifth removing station, for removing foreign matters around the tablets and defects of tablet fragments and laminations.

A control unit is respectively connected with the first lighting unit, the first shooting unit, the first removing station, the second lighting unit, the second shooting unit, the second removing station, the third lighting unit, the third shooting unit, the third removing station, the fourth lighting unit, the fourth shooting unit, the fourth removing station, the fifth lighting unit, the fifth shooting unit and the fifth removing station, and 1s used for controlling the working state of each unit.

In an embodiment of the application, the first shooting unit and the second shooting unit are vertically arranged from top to bottom and face the back of the tablet substrate; the third shooting unit and the fourth shooting unit are vertically arranged from bottom to top and face the front surface of the tablet substrate; the fifth shooting unit is placed obliquely and faces the peripheral surface of the tablet.

The second shooting unit is a black-and-white area array camera, and the first shooting unit, the third shooting unit, the fourth shooting unit and the fifth shooting unit are all color area array cameras.

The second shooting unit is a black-and-white area array camera, and the first shooting unit, the third shooting unit, the fourth shooting unit and the fifth shooting unit are all color area array cameras. LU502748

In one embodiment of the present application, the large-diameter annular light source adopts a low angle, the angle of which 1s determined according to the size of the tablet substrate, and its range is 30-75 degrees, and uniformly illuminates the aluminum foil on the back of the tablet substrate.

The surface light source is a surface light source whose length and width are larger than those of the tablet substrate, and is used for backlighting the tablet and its substrate.

The fifth shooting unit comprises four groups of color area array cameras and ultra-short focal length lenses; four sets of color cameras shoot the four side surfaces of the tablets from two directions: the tablet movement direction, the opposite direction and the direction perpendicular to the tablet movement direction, respectively. The angle between the main optical axis of the lens and the horizontal plane is 15-25 degrees.

According to the second aspect of the disclosed embodiment of the present application, there is provided a lighting and shooting method suitable for the optical design system based on tablet vision inspection, the lighting and shooting method comprises:

S1, the conveying belt drives the medicine to enter a first station, and the first lighting unit uniformly polishes the back surface of the tablet substrate; the first shooting unit shoots the defects of yellowing, whitening and breakage of the aluminum foil on the back surface of the medicine substrate and the defects of reprint, missing printing and misprinting of a production batch number; and judging the defects of yellowing, whitening and breakage of the aluminum foil on the back of the drug substrate, and the defects of reprinting, missing printing and misprinting of the production batch number; yes, the control unit controls the removing station to reject drugs, no, executing S2;

S2, the conveyor belt drives the medicine to enter a second station, and the second lighting unit provides a backlight source for shooting the back of the tablet substrate; the second shooting unit shoots the crack and damage defect of the aluminum foil on the back of the medicine substrate; and judging whether the aluminum foil on the back of the drug substrate is cracked or damaged; yes, the control unit controls the removing station to reject drugs, no, executing S3.

S3, the conveyor belt drives the medicine to enter the third station, and the third lighting unit uniformly illuminates the front surface of the tablet substrate, the front surface of the tablet, 502748 and the reinforcing rib area; the third shooting unit shoots foreign matters, broken grain defects, reinforcing rib foreign matters, breakage defects, aluminum foil breakage on the front surface of the tabletsubstrate, and reticulated hollow defects on the front surface of the tablet; and judging whether there are foreign matters and broken grains on the front of the tablet; whether there is any foreign matters or damage on the reinforcement; and whether the aluminum foil on the front surface of the substrate is damaged or not, and the net pattern is hollow; yes, the control unit controls the removing station to reject the tablets, no, executing S4;

S4, the conveyor belt drives the medicine to enter a fourth station, the fourth lighting unit illuminates the front surface of the tablet substrate, uniformly illuminates the front aluminum foil so that the front aluminum foil does not reflect light, and illuminates the surface of a blister so that the surface of the blister has regular reflection; the fourth shooting unit shoots the light reflection on the surface of each blister, and detects the collapse deformation defect of the blister according to the light reflection; and judging whether the blister is squashed and deformed, yes, the control unit controls the removing station to reject the medicine, no, executing S5;

SS, the conveyor belt drives the medicine to enter the fifth station, and the fifth lighting unit illuminates the periphery of the tablet, so that the front substrate aluminum foil does not reflect light; the fifth shooting unit shoots the foreign matters around the tablets, as well as the tablet fragments and lamination defects; and judging whether foreign matters exist around the tablets and whether the tablets are broken or laminated; yes, the control unit controls the reject station to reject the medicine; no, entering the qualified area.

In one embodiment of the application, in S1, a large-diameter annular light source of the first lighting unit is used for lighting the back surface of the tablet substrate, and the light source lighting direction is vertically downward; in S2, a surface light source of which the length and the width are larger than those of the tablet substrate of the second lighting unit is used for backlighting the tablet and the substrate thereof, and the lighting direction of the light source is vertically upward, LU502748 in S3, a large-diameter coaxial light source of the third lighting unit 1s used for lighting the front surface of the tablet substrate, and the lighting direction of the light source is vertically upward; in S4, a large-diameter annular light source of the fourth lighting unit is used for lighting the front surface of the tablet substrate, and the lighting direction of the light source is vertical upward; in S5, a small-diameter annular light source of the fifth lighting unit 1s used for lighting the side surface of the tablet, and the lighting direction of the light source is vertically upward.

Before entering the first station, the tablets and their substrates are placed on the lower conveyor belt with the back facing upwards, the tablets pass through the first station and the second station with the back facing upwards, and the first lighting unit and the first shooting unit of the first station are above the lower conveyor belt and face the back of the tablet substrates; the second lighting unit of the second station faces the tablet substrate between the conveyor belt and the tablet substrate, and the second shooting unit of the second station faces the back of the tablet substrate above the lower conveyor belt; after passing through the second station, the tablets are adsorbed on the upper conveyor belt under the action of negative pressure. At this time, the tablet substrate faces downwards, and the tablets and their substrates move along with the upper conveyor belt, passing through the third station, the fourth station and the fifth station.

The third lighting unit, the third shooting unit, the fourth lighting unit, the fourth shooting unit, the fifth lighting unit and the fifth shooting unit corresponding to the third, fourth and fifth stations face the front of the tablet substrate below the upper conveyor belt;

The first shooting unit, the second shooting unit, the third shooting unit, the fourth shooting unit and the fifth shooting unit comprise nine groups of camera lenses. According to the camera imaging principle, the camera lens determines that the visual field HF is larger than the long side of the tablet substrate; the focal length f of the lens is selected, which satisfies f = working distance WD x camera target size (h)/ field of view HF.

According to the third aspect of the disclosed embodiment of the present application, there is provided a controller, which comprises a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the lighting and shooting method. LU502748

The technical scheme provided by the embodiment disclosed by the application can include the following beneficial effects:

The optical design system provided by the application can effectively collect the picture information of each external surface required for tablet quality detection; compared with other patent schemes, the scheme of the application enriches the coverage angle of camera detection and effectively improves the detection rate of defects; because the optical environment of tablets can't clearly reflect the obvious characteristics, the detection accuracy of the later algorithm is reduced, and the recognition accuracy is 99.7% after testing.

When that optical design system of the application is implemented, the original tablet production line does not nee to be interrupted, and only a detection station and a removing station need to be additionally arranged on the original production line; when the optical scheme of the application is implemented, automatic picture collection is completed without affecting the original tablet production rhythm, and automatic classification and elimination are realized according to the types of defects.

It is to be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit the disclosure of the application.

BRIEF DESCRIPTION OF THE FIGURES

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a flowchart of a lighting and shooting method provided by an embodiment of the present application.

FIG. 2A is a schematic diagram of the relative positions of the lighting unit and the shooting unit of each station, the conveying mechanism and the sample provided by the embodiment of the present application;

FIG. 2B is a schematic diagram of the relative position effect of the lighting unit and the shooting unit of each station, the conveying mechanism and the sample provided by the embodiment of the present application;

In FIG. 2A and FIG. 2B: 1- a first station; 2- a second station; 3- a third station; 4- a fourfh 5027 48 station; 5- a fifth station.

FIG. 3A is a schematic diagram of the relative positions of the lighting unit and the shooting unit and the sample in the first station provided by the embodiment of the present application;

FIG. 3B is a schematic diagram of the relative positions of the lighting unit and the shooting unit and the sample in the first station provided by the embodiment of the present application;

In FIG. 3A and FIG. 3B: 101- a first station color area array camera; 102- a first lens; 103- a first station large diameter annular light source; 104- a first tablet and its substrate; 105- a first conveyor.

FIG. 4A is a schematic diagram of the relative positions of a lighting unit and a shooting unit with respect to a sample in a second station according to an exemplary embodiment provided by an embodiment of the present application;

FIG. 4B is a schematic diagram of the relative positions of the lighting unit and the shooting unit to the sample in the second station according to an exemplary embodiment provided by the embodiment of the present application;

In FIG. 4B: 201- black-and-white area array camera; 202- a second lens; 203- second tablet and its substrate; 204- area light source; 205- second transfer device.

FIG. SA is a schematic diagram of the relative positions of the lighting unit and the shooting unit and the sample in the third station provided by the embodiment of the present application;

FIG. SB is a schematic diagram of the relative positions of the lighting unit and the shooting unit and the sample in the third station provided by the embodiment of the present application;

In FIG. 5B: 301-a third station color area array camera; 302-a third lens; 303-a large aperture coaxial light source; 304-a third tablet and its substrate; 305-a third transfer device.

FIG. 6A is a schematic diagram of the relative positions of the lighting unit and the shooting unit and the sample in the fourth station provided by the embodiment of the present application.

FIG. 6B is a schematic diagram of the relative positions of the lighting unit and the shooting unit and the sample in the fourth station provided by the embodiment of the present application;

In FIG. 6B: 401-a fourth station color area array camera and lens; 402-a fourth station large diameter annular light source; 403- a fourth tablet and its substrate; 404- a fourth conveyor.

FIG. 7A is a schematic diagram of the relative positions of the lighting unit and the shooting unit and the sample in the fifth station provided by the embodiment of the present application;

FIG. 7B is a schematic view of the relative positions of the lighting unit and the shooting 5927 48 unit and the sample in the fifth station provided by the embodiment of the present application;

FIG. 7C is an overhead schematic view of the relative positions of the lighting unit, the shooting unit and the sample in the fifth station provided by the embodiment of the present application;

In FIG. 7B: 501-a color area array camera shooting the long side direction of the tablet substrate at the fifth station; 502- a first ultra-short focus lens; 503-a color area array camera for shooting the short side direction of tablet substrate at the fifth station; 504- a second ultra-short focus lens; 505- a small diameter annular light source, 506- a fifth tablet and its substrate; 507- a fifth conveyor.

DESCRIPTION OF THE APPLICATION

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, like numerals in different drawings refer to the same or like elements unless no indicated. The embodiments described in the following exemplary embodiments are not representative of all embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

As shown in FIG. 1, the lighting and shooting method provided by the embodiment of the present application comprises:

S1, the conveying belt drives the medicine to enter a first station 1, and the first lighting unit uniformly polishes the back surface of the tablet substrate; the first shooting unit shoots the defects of yellowing, whitening and breakage of the aluminum foil on the back surface of the medicine substrate and the defects of reprint, missing printing and misprinting of a production batch number; and judging the defects of yellowing, whitening and breakage of the aluminum foil on the back of the drug substrate, and the defects of reprinting, missing printing and misprinting of the production batch number; yes, the control unit controls the removing station to reject drugs, no, executing S2;

S2, the conveyor belt drives the medicine to enter a second station 2, and the second lighting unit provides a backlight source for shooting the back of the tablet substrate;

the second shooting unit shoots the crack and damage defect of the aluminum foil on the 5007 48 back of the medicine substrate; and judging whether the aluminum foil on the back of the drug substrate is cracked or damaged; yes, the control unit controls the removing station to reject drugs, no, executing S3.

S3, the conveyor belt drives the medicine to enter the third station, and the third lighting unit uniformly illuminates the front surface of the tablet substrate, the front surface of the tablet and the reinforcing rib area; the third shooting unit shoots foreign matters, broken grain defects, reinforcing rib foreign matters, breakage defects, aluminum foil breakage on the front surface of the tabletsubstrate, and reticulated hollow defects on the front surface of the tablet; and judging whether there are foreign matters and broken grains on the front of the tablet; whether there is any foreign matters or damage on the reinforcement; and whether the aluminum foil on the front surface of the substrate is damaged or not, and the net pattern is hollow; yes, the control unit controls the removing station to reject the tablets, no, executing S4;

S4, the conveyor belt drives the medicine to enter a fourth station, the fourth lighting unit illuminates the front surface of the tablet substrate, uniformly illuminates the front aluminum foil so that the front aluminum foil does not reflect light, and illuminates the surface of a blister so that the surface of the blister has regular reflection; the fourth shooting unit shoots the light reflection on the surface of each blister, and detects the collapse deformation defect of the blister according to the light reflection; and judging whether the blister is squashed and deformed, yes, the control unit controls the removing station to reject the medicine, no, executing S5;

SS, the conveyor belt drives the medicine to enter the fifth station, and the fifth lighting unit illuminates the periphery of the tablet, so that the front substrate aluminum foil does not reflect light; the fifth shooting unit shoots the foreign matters around the tablets, as well as the tablet fragments and lamination defects; and judging whether foreign matters exist around the tablets and whether the tablets are broken or laminated; yes, the control unit controls the reject station to reject the medicine; no, entering the qualified area.

in S1, a large-diameter annular light source of the first lighting unit is used for lighting the 5007 48 back surface of the tablet substrate, and the light source lighting direction is vertically downward; in S2, a surface light source of which the length and the width are larger than those of the tablet substrate of the second lighting unit is used for backlighting the tablet and the substrate thereof, and the lighting direction of the light source is vertically upward, in S3, a large-diameter coaxial light source of the third lighting unit is used for lighting the front surface of the tablet substrate, and the lighting direction of the light source is vertically upward, in S4, a large-diameter annular light source of the fourth lighting unit is used for lighting the front surface of the tablet substrate, and the lighting direction of the light source is vertical upward, in S5, a small-diameter annular light source of the fifth lighting unit is used for lighting the side surface of the tablet, and the lighting direction of the light source is vertically upward.

The application also provides an optical design system based on tablet visual detection, the detection objects are tablets, aluminum foil plates of a packaging substrate of the tablets and blisters for wrapping the tablets; along with the movement of a conveyor belt, samples are driven to pass through a first station 1, a second station 2, a third station 3, a fourth station 4 and a fifth station 5, the system performs real-time detection on sample defects and reject defective products. And the optical design system based on tablet visual detection further comprises a shooting system; the shooting system comprises:

A first lighting unit and a first shooting unit; the first lighting unit comprises a large-diameter annular light source, which is used for uniformly lighting the back surface of the tablet substrate.

The first shooting unit comprises a color camera and a lens, and is used for shooting the defects of yellowing, whitening and breakage of the aluminum foil on the back of tablet substrate, and the defects of reprinting, skip printing and misprinting of the production batch number; a second lighting unit and a second shooting unit;

The second lighting unit comprises an area light source, and is used for providing a backlight source for shooting the back surface of the tablet substrate.

The second shooting unit, comprises a black-and-white camera and a lens, and is used for shooting the aluminum foil crack damage defect on the back surface of the tablet substrate; LU502748 a third lighting unit and a third shooting unit, the third lighting unit comprises a large-caliber coaxial light source, and is used for uniformly illuminating the front surface of the tablet substrate, the front surface of the tablet and the reinforcing rib area.

The third shooting unit, comprises a color camera and a lens, and is used for shooting foreign matters, broken grain defects, reinforcing rib foreign matters, breakage defects, aluminum foil breakage on the front surface of the tabletsubstrate, and reticulated hollow defects on the front surface of the tablet: a fourth lighting unit and a fourth shooting unit;

The fourth lighting unit comprises a large-diameter annular light source, and is used for illuminating the front surface of the tablet substrate, uniformly illuminating the front aluminum foil so that the front aluminum foil does not reflect light, and illuminating the surfaces of blisters so that the surfaces of the blisters have regular reflection light.

The fourth shooting unit, comprises a color camera and a lens, and is used for shooting the reflection on the surface of each blister and detecting the deformation defect of the blister according to the reflection; a fifth lighting unit and a fifth shooting unit;

The fifth lighting unit comprises a small-diameter annular light source, and is used for illuminating the periphery of the tablet and making the front substrate aluminum foil not reflect light.

The fifth shooting unit, comprises a plurality of groups of color cameras and short-focus lenses, and is used for shooting foreign matters around the tablets and defects of tablet fragments and laminations.

A control unit is connected with the first lighting unit, the second lighting unit, the third lighting unit, the fourth lighting unit and the fifth lighting unit respectively.

In an embodiment of the application, the first lighting unit comprises a large-diameter annular light source for uniformly illuminating the aluminum foil on the back of the tablet substrate, and the light source adopts a low angle, which can reduce the influence of reflection on the photo quality. The large-diameter annular light source is adopted, which avoids the reflection of the small-diameter annular light source beads on the aluminum foil and improves the photo quality. LU502748

The first shooting unit, the second shooting unit, the third shooting unit, the fourth shooting unit and the fifth shooting unit comprise nine groups of camera lenses. According to the imaging principle of the camera: determining the field of view (FOV) and working distance (WD) to be achieved, and calculating the focal length (f) of the industrial lens according to them. The calculation formula is as follows:

The focal length f = WD x target size h/FOV(H or V);

Field of view HF = WD x target size (h)/ focal length f;

The FOV (H or V) = target size (h)/ optical power;

Working distance WD = f (focal length) x target size (h)/FOV(H or V);

Optical magnification = target size (h)/FOV(H or V);

For the field of view HF, HF should be greater than the long side of the tablet substrate; the focal length f of the lens shall be selected, and f shall meet the requirement that f = working distance WD X camera target size (h)/ field of view HF; the first shooting unit comprises a group of color cameras and lenses which are vertically arranged downwards and face the back surface of the tablet substrate. It is used to photograph the defects such as yellowing, whitening and breakage of aluminum foil on the back of drug substrate, as well as the defects such as reprinting, missing printing and misprinting of production batch numbers.

In one embodiment of the present application, the second lighting unit includes a surface light source whose length and width are larger than those of the tablet substrate to backlight the tablet and its substrate. The backlight mode can make the defects such as cracks and breakage of aluminum foil more obvious, enhance the contrast between the defective area and the normal area, improve the image quality, and facilitate the defect detection.

The second shooting unit includes a set of black-and-white cameras and lenses, which are vertically placed downward and face the back of the tablet substrate. Used to photograph defects such as cracks and breakage of aluminum foil on the back of tablet substrate.

In a preferred embodiment of the application, the third lighting unit comprises a large-caliber coaxial light source, which uniformly illuminates the front surface of the tablet substrate, the front surface of the tablet and the reinforcing rib area. The adoption of the coaxial light source is beneficial to weakening the reflection on the front surface of the tablet substrate,

weakening the influence of the reflection on the shooting defect area, improving the image 5027 48 quality and being beneficial to defect detection.

The third shooting unit comprises a group of color cameras and lenses which are vertically arranged upwards and face the front surface of the tablet substrate. Used to photograph defects such as foreign matters and broken grains on the front of tablets; defects such as foreign matters and breakage of reinforcing ribs, and defects such as breakage of aluminum foil on the front surface of the substrate and hollowness of reticulated patterns.

In a preferred embodiment of the present application, the fourth lighting unit comprises a large-diameter annular light source for lighting the blister area of the tablet so as to cause regular light reflection on the blister surface. The annular light can provide a light source for generating light reflection, and the large-diameter annular light source can prevent the light reflected by the aluminum foil on the front surface of the tablet substrate from entering the camera, thereby improving the image quality and being beneficial to defect detection.

The fourth shooting unit comprises a group of color cameras and lenses which are vertically arranged upwards and face the front surface of the tablet substrate. It is used to photograph the reflection of each blister surface and detect defects such as blister deformation based on the reflection.

In a preferred embodiment of the present application, the fifth lighting unit comprises a small diameter annular light source for illuminating the peripheral side surface of the tablet. The annular light source can be used for brightening the peripheral side surface of the tablet, and the small-diameter annular light source 1s used for preventing the large-diameter annular light source from reflecting light on the lamp bead of the aluminum foil part on the front surface of the tablet substrate, thereby improving the image quality and being beneficial to defect detection.

The fifth shooting unit comprises four groups of color area array cameras and ultra-short focal length lenses which are obliquely arranged upwards and face the front side surface of the tablet substrate. Used to photograph the four side surfaces of the tablet. The four groups of color cameras respectively photograph the four side surfaces of the tablets from the tablet movement direction, the tablet movement reverse direction and the two directions perpendicular to the tablet movement direction, and the included angle between the lens main optical axis and the horizontal plane is between 15 degrees and 25 degrees. The ultra-short focal lens can effectively increase the compatible range of the depth of field of the system, so that the detection range can cover more rows of tablets. LU502748

In a preferred embodiment of that present application, a large-diameter annular light source, the diameter of which is determine according to the drug substrate to be detect, has a light source diameter 1.5 to 3 times that of the tablet substrate.

A large-caliber coaxial light source, the diameter of the light source is determined according to the detected medicine substrate, the diameter of which is 1 .5-3 times that of the tablet substrate.

A large-diameter ring light source, the diameter of the light source is determined according to the test drug substrate, and the diameter of the light source is 1 .5-3 times that of the tablet substrate.

A small-diameter ring light source, the diameter of the light source is determined according to the test drug substrate, and the diameter of the light source is 1-2 times that of the tablet substrate.

The technical scheme of the present application is further described below with reference to specific embodiments.

Embodiment:

The technical scheme provided by the disclosed embodiment of the application relates to an optical design system based on tablet visual detection, in particular to the technical field of tablet quality detection and visual optical design. In the related art, manual or semi-automatic detection is not conducive to improving the detection efficiency and ensuring the detection accuracy, while the existing optical scheme based on visual detection also has some limitations, for example, in the existing tablet detection patent, the following shooting scheme is adopted: shooting the upper surface of the tablets on the tablet tray in a static state by using an area array camera, identifying defects, and removing defective products.

According to the existing scheme, an area array camera is used to photograph the upper surface from above, so that a blind area is formed on the side surface of the tablet and the back surface of the tablet substrate, so that the area for shooting the tablet is incomplete, and a large number of missed detection phenomena are easily caused. In addition, the detection efficiency is low, which cannot meet the production beat of drugs and affects the production efficiency.

Based on this, the technical scheme disclosed by the application provides an optical design system based on tablet visual detection, which can effectively collect picture information of each outer surface required for tablet quality detection, Compared with the scheme described in other,5027 48 patents, the scheme disclosed by the application enriches the coverage angle of camera detection and effectively improves the detection rate of defects; when the optical design system is implemented, the original tablet production line does not need to be interrupted, and only a detecting station and a rejecting station are additionally arranged on the original production line; when the optical scheme disclosed by the application is implemented, automatic picture acquisition 1s completed while not affecting the original tablet production.

As shown in FIG. 2A , FIG. 2B, in the optical design system based on tablet visual detection, the detection objects are tablets, aluminum foil plates of a packaging substrate of the tablets and blisters for wrapping the tablets; along with the movement of a conveyor belt, samples are driven to pass through a first station 1, a second station 2, a third station 3, a fourth station 4 and a fifth station 5.

The purpose of the present application is to solve the above shortcomings in the prior art, and provide an optical design system that can effectively photograph all detected items, thereby reducing labor intensity, maintenance cost and potential risks, and improving shooting accuracy and detection speed. In order to achieve the above object, the present application provides an optical design system for detecting tablets.

In the embodiment, as shown in FIG. 3A, FIG. 3B, the structure of the relative position between the lighting unit and the shooting unit in the first station 1 and the sample includes the first station color area array camera 101, the first lens 102, the first station large-diameter annular light source 103, the first tablet and its substrate 104, and the first conveyor 105.

The conveying section is divided into an upper conveyor belt and a lower conveyor belt. In front of the first station 1, the first tablet and the back surface of its substrate 104 are placed upward on the conveyor belt of the lower first conveying device 105.

The control unit turns on the first lighting unit, and the tablet and the back of the substrate thereof pass through the first station 1 upward. The lighting unit and the shooting unit of the first station 1 face the back of the tablet substrate above the lower conveyor belt. The first lighting unit comprises a large-diameter annular light source for uniformly lighting the back surface of the tablet substrate. The first shooting unit comprises a set of color cameras and lenses, which are used for shooting defects such as yellowing, whitening and breakage of the aluminum foil on the back of the tablet substrate, and defects such as reprinting, skip printing and misprinting of the production batch number. LU502748

After the real-time defect identification is carried out on the pictures, the defective products are removed by the removing mechanism.

After passing through the first station 1, the first tablet and its substrate 104 enter the second station 2 with the back side facing upward.

As shown in FIG. 4A and FIG. 4B, the relative position structure of the lighting unit and the shooting unit in the second station 2 and the sample includes a black-and-white area array camera 201, a second lens 202, a second tablet and its substrate 203, a surface light source 204, and a second conveyor 205.

The control unit turns on the second lighting unit, and the second tablet and its substrate 203 face up and pass through the second station 2. The lighting unit of the second station 2 faces the second tablet and its substrate 203 between the conveyor belt of the second conveyor 205 and the second tablet and its substrate 203.

The shooting unit of the second station 2 faces the second tablet and the back surface of its substrate 203 thereof above the conveyor belt of the lower second conveyor 205. The second lighting unit comprises a surface light source 204, which is used for providing a backlight for shooting the back surface of the second tablet and the substrate 203 thereof. The second shooting unit comprises a group of black-and-white area array cameras 201 and a second lens 202, and is used for shooting defects such as cracks and breakage of an aluminum foil on the back surface of a tablet substrate.

After the real-time defect identification is carried out on the pictures, the defective products are removed by the removing mechanism.

After passing through the second station 2, the second tablet and its substrate 203 are adsorbed on the upper conveyor belt under the action of negative pressure, at this time, the second tablet and its substrate 203 face downward, and the second tablet and its substrate 203 move with the upper conveyor belt to enter the third station 3.

As shown in FIG. 5A and FIG. 5B, the relative position structure between the lighting unit and the shooting unit in the third station 3 and the sample includes the third station color area array camera 301, the third lens 302, the large-aperture coaxial light source 303, the third tablet and its substrate 304, and the third conveying device 305.

The control unit turns on the third lighting unit, and the third tablet and its substrate 304 face down through the third station 3. The lighting unit and shooting unit of the third station 35027 48 face the front of the third tablet and its substrate 304 under the conveyor belt of the upper third conveyor 305. The third lighting unit includes a large-aperture coaxial light source 303, which 1s used to uniformly illuminate the front surface of the third tablet and its substrate 304, the front surface of the third tablet and its substrate 304, and the reinforcing rib area.

The third shooting unit includes a group of third-station color area array cameras 301 and a third lens 302, which are used to photograph the defects such as foreign matters and broken grains on the front of the tablet, foreign matters and damaged reinforcing ribs, damaged aluminum foil on the front of the substrate, hollow reticulate and the like.

After the real-time defect identification of the picture, the defective products are removed by the removal mechanism.

After the third tablet and its substrate 304 pass through the third station 3, they enter the fourth station 4 with a face-down attitude.

As shown in FIG. 6A and FIG. 6B, the relative position structure of the lighting unit and the shooting unit and the sample in the fourth station 4 provided by the embodiment of the application comprises:

A fourth station color area array camera and lens 401, a fourth station large-diameter annular light source 402, a fourth tablet and its substrate 403, and a fourth conveying device 404.

The control unit turns on the fourth lighting unit, and the color area array camera and lens 401 of the fourth station face down through the fourth station 4.

The lighting unit and the shooting unit of the fourth station 4 face the front side of the fourth tablet and its substrate 403 below the conveyor belt of the upper fourth conveyor 404.

The fourth lighting unit includes a large-diameter ring light source 402, which is used to illuminate the front of the fourth tablet and its substrate 403, uniformly illuminate the front aluminum foil to make it non-reflective, and illuminate the bubble cap surface to make it regularly reflective.

The fourth shooting unit comprises a group of fourth station color area array cameras and lenses 401, and is used for shooting the reflection of light on the surfaces of each bubble cap and detecting defects such as bubble cap deformation and the like according to the reflection.

FIG. 6(B) shows a photographic sample of the fourth station 4 according to an exemplary embodiment of the present application, after real-time defect recognition of the picture, the defective product is removed by the removal mechanism. LU502748

After passing through the fourth station 4, the fourth tablet and its substrate 403 enter the fifth station 5 with its face down.

As shown in FIG.7A, FIG. 7B and FIG. 7C, The relative position structure between the lighting unit and the shooting unit in the fifth station 5 and the sample includes: the color array camera 501 for shooting the long side direction of the tablet substrate in the fifth station, the first ultra-short focal lens 502, the color array camera 503 for shooting the short side direction of the tablet substrate in the fifth station, the second ultra-short focal length lens 504, the small-diameter annular light source 505, the fifth tablet and its substrate 506, and the fifth conveyor 507.

The control unit turns on the fifth lighting unit, and the fifth tablet and its substrate 506 pass through the fifth station 5 face down. The lighting unit and the shooting unit of the fifth station 5 are inclined toward the front side of the fifth tablet and its substrate 506 below the conveyor belt of the upper fifth conveyor 507.

The fifth lighting unit comprises a small-diameter annular light source 505 for illuminating the periphery of the tablet and making the front substrate aluminum foil not reflective. The fifth shooting unit comprises a color plane array camera 501, a first ultra-short focal lens 502, a color plane array camera 503 and a second ultra-short focal lens 504, wherein the color plane array camera 501, the first ultra-short focal lens 502, the color plane array camera 503 and the second ultra-short focal lens 504 are used for shooting foreign matters around a tablet and defects such as tablet fragments, laminations and the like; where, two color area array cameras 501 and two first ultra-short focus lenses 502 are used in the fifth station to shoot the long side direction of the tablet substrate, forming two groups. In the fifth station, two color area array cameras 503 and two second ultra-short focal lenses 504 are used to photograph the short side of the tablet substrate, and two groups are formed.

After the real-time defect identification of the picture, the defective products are eliminated by the elimination mechanism.

In an exemplary embodiment of the present application, according to the camera imaging principle:

Determining the desired field of view (FOV) and working distance (WD), and calculating the focal length (f) of the industrial lens based on both, using the following formula:

The focal length f = WDx target size h/FOV(H or V); LU502748

Field of view HF = WD x target size (h)/ focal length f;

The FOV (H or V) = target size (h)/ optical power;

Working distance WD = f (focal length) x target size (h)/FOV(H or V);

Optical magnification = target size (h)/FOV(H or V);

For the field of view HF, HF should be greater than the long side of the tablet substrate; the focal length f of the lens shall be selected, and f shall meet the requirement that f = working distance WD x camera target size (h)/ field of view HF;

Other embodiments of the disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any modifications, uses, or adaptations of the disclosure following the general principles of the disclosure and including those familiar with the art or customary practice in the art to which the disclosure relates that are not disclosed. The specification and examples are to be regarded as exemplary only, with a true scope and spirit of the disclosure being indicated by the appended claims.

It is to be understood that the present disclosure is not limited to the precise construction which has been described above and illustrated in the accompanying drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited by the appended claims.

Claims (10)

CLAIMS LU502748

1. An optical design system based on tablet visual detection, characterized in that the detection objects are tablets, aluminum foil plates of a packaging substrate of the tablets and blisters for wrapping the tablets; along with the movement of a conveyor belt, samples are driven to pass through a first station, a second station, a third station, a fourth station and a fifth station, and the optical design system based on tablet visual detection further comprises a shooting system; the shooting system comprises: a first lighting unit, comprises a large-diameter annular light source, and is used for uniformly lighting the back surface of the tablet substrate; a first shooting unit, comprises a color camera and a lens, and is used for shooting the defects of yellowing, whitening and breakage of the aluminum foil on the back of tablet substrate, and the defects of reprinting, skip printing and misprinting of the production batch number; a second lighting unit, comprises an area light source, and is used for providing a backlight source for shooting the back surface of the tablet substrate; a second shooting unit, comprises a black-and-white camera and a lens, and is used for shooting the aluminum foil crack damage defect on the back surface of the tablet substrate; a third lighting unit, comprises a large-caliber coaxial light source, and is used for uniformly illuminating the front surface of the tablet substrate, the front surface of the tablet and the reinforcing rib area; a third shooting unit, comprises a color camera and a lens, and is used for shooting foreign matters, broken grain defects, reinforcing rib foreign matters, breakage defects, aluminum foil breakage on the front surface of the tablet substrate, and reticulated hollow defects on the front surface of the tablet; a fourth lighting unit, comprises a large-diameter annular light source, and the light source is used for illuminating the front surface of the tablet substrate, uniformly illuminating the front aluminum foil so that the front aluminum foil does not reflect light, and illuminating the surfaces of blisters so that the surfaces of the blisters have regular reflection light; a fourth shooting unit, comprises a color camera and a lens, and is used for shooting the reflection on the surface of each blister and detecting the deformation defect of the blister according to the reflection; a fifth lighting unit, comprises a small-diameter annular light source, and is used for illuminating the periphery of the tablet and making the front substrate aluminum foil not reflect 5027 48 light; a fifth shooting unit, comprises a plurality of groups of color cameras and short-focus lenses, and is used for shooting foreign matters around the tablets and defects of tablet fragments and laminations; a control unit is respectively connected with the first lighting unit, the first shooting unit, the second lighting unit, the second shooting unit, the third lighting unit, the third shooting unit, the fourth lighting unit, the fourth shooting unit, the fifth lighting unit, the fifth shooting unit, and is used for controlling the working state of each unit.

2. The optical design system based on tablet visual detection according to claim 1, characterized in that the first shooting unit and the second shooting unit are vertically arranged from top to bottom and face the back of the tablet substrate; the third shooting unit and the fourth shooting unit are vertically arranged from bottom to top and face the front surface of the tablet substrate; the fifth shooting unit is placed obliquely and faces the peripheral surface of the tablet.

3. The optical design system based on tablet visual detection according to claim 1, characterized in that the second shooting unit is a black-and-white area array camera, and the first shooting unit, the third shooting unit, the fourth shooting unit and the fifth shooting unit are all color area array cameras.

4. The optical design system based on tablet visual detection according to claim 1, characterized in that the large-diameter annular light source adopts a low angle, and uniformly illuminates the aluminum foil on the back of the tablet substrate.

5. The optical design system based on tablet visual detection according to claim 1, characterized in that the surface light source is a surface light source whose length and width are larger than those of the tablet substrate, and is used for backlighting the tablet and its substrate.

6. The optical design system based on tablet visual detection according to claim 1, characterized in that the fifth shooting unit comprises four groups of color area array cameras and ultra-short focal length lenses; four sets of color cameras shoot the four side surfaces of the tablets from two directions: the tablet movement direction, the opposite direction and the direction perpendicular to the tablet movement direction, respectively; the angle between the main optical axis of the lens and the horizontal plane is 15-25 degrees.

7. A lighting and shooting method suitable for the optical design system according to any one of claims 1-6 based on tablet vision inspection, characterized in that the lighting and 5027 48 shooting method comprising:

S1, the conveying belt drives the medicine to enter a first station, and the first lighting unit uniformly polishes the back surface of the tablet substrate; the first shooting unit shoots the defects of yellowing, whitening and breakage of the aluminum foil on the back of the medicine substrate and the defects of reprint, missing printing and misprinting of a production batch number;

and judging the defects of yellowing, whitening and breakage of the aluminum foil on the back of the drug substrate, and the defects of reprinting, missing printing and misprinting of the production batch number;

yes, the control unit controls the removing station to reject drugs, no, executing S2;

S2, the conveyor belt drives the medicine to enter a second station, and the second lighting unit provides a backlight source for shooting the back of the tablet substrate;

the second shooting unit shoots the crack and damage defect of the aluminum foil on the back of the medicine substrate;

and judging whether the aluminum foil on the back of the drug substrate is cracked or damaged; yes, the control unit controls the removing station to reject drugs, no, executing S3;

S3, the conveyor belt drives the medicine to enter the third station, and the third lighting unit uniformly illuminates the front surface of the tablet substrate, the front surface of the tablet and the reinforcing rib area;

the third shooting unit shoots foreign matters, broken grain defects, reinforcing rib foreign matters, breakage defects, aluminum foil breakage on the front surface of the tabletsubstrate, and reticulated hollow defects on the front surface of the tablet;

and judging whether there are foreign matters and broken grains on the front of the tablet; whether there is any foreign matters or damage on the reinforcement; and whether the aluminum foil on the front surface of the substrate is damaged or not, and the net pattern is hollow;

yes, the control unit controls the removing station to reject the tablets, no, executing S4;

S4, the conveyor belt drives the medicine to enter a fourth station, the fourth lighting unit illuminates the front surface of the tablet substrate, uniformly illuminates the front aluminum foil so that the front aluminum foil does not reflect light, and illuminates the surface of a blister so that the surface of the blister has regular reflection; the fourth shooting unit shoots the light reflection on the surface of each blister, and detects the collapse deformation defect of the blister, 502748 according to the light reflection; and judging whether the blister is squashed and deformed, yes, the control unit controls the removing station to reject the medicine, no, executing S5; SS, the conveyor belt drives the medicine to enter the fifth station, and the fifth lighting unit illuminates the periphery of the tablet, so that the front substrate aluminum foil does not reflect light; the fifth shooting unit shoots the foreign matters around the tablets, as well as the tablet fragments and lamination defects; and judging whether foreign matters exist around the tablets and whether the tablets are broken or laminated; yes, the control unit controls the reject station to reject the medicine; no, entering the qualified area.

8. The lighting and shooting method according to claim 7, characterized in that in S1, a large-diameter annular light source of the first lighting unit is used for lighting the back surface of the tablet substrate, and the light source lighting direction is vertically downward, in S2, a surface light source of which the length and the width are larger than those of the tablet substrate of the second lighting unit is used for backlighting the tablet and the substrate thereof, and the lighting direction of the light source is vertically upward, in S3, a large-diameter coaxial light source of the third lighting unit is used for lighting the front surface of the tablet substrate, and the lighting direction of the light source is vertically upward, in S4, a large-diameter annular light source of the fourth lighting unit is used for lighting the front surface of the tablet substrate, and the lighting direction of the light source is vertical upward, in S5, a small-diameter annular light source of the fifth lighting unit is used for lighting the side surface of the tablet, and the lighting direction of the light source is vertically upward.

9. The lighting and shooting method according to claim 7, characterized in that before entering the first station, the tablets and their substrates are placed on the lower conveyor belt with the back facing upwards, the tablets pass through the first station and the second station with the back facing upwards, and the first lighting unit and the first shooting unit of the first station are above the lower conveyor belt and face the back of the tablet substrates; LU502748 the second lighting unit of the second station faces the tablet substrate between the conveyor belt and the tablet substrate, and the second shooting unit of the second station faces the back of the tablet substrate above the lower conveyor belt; after passing through the second station, the tablets are adsorbed on the upper conveyor belt under the action of negative pressure; at this time, the tablet substrate faces downwards, and the tablets and their substrates move along with the upper conveyor belt, passing through the third station, the fourth station and the fifth station: the third lighting unit, the third shooting unit, the fourth lighting unit, the fourth shooting unit, the fifth lighting unit and the fifth shooting unit corresponding to the third, fourth and fifth stations face the front of the tablet substrate below the upper conveyor belt; the first shooting unit, the second shooting unit, the third shooting unit, the fourth shooting unit and the fifth shooting unit comprise nine groups of camera lenses; according to the camera imaging principle, the camera lens determines that the visual field HF is larger than the long side of the tablet substrate; the focal length f of the lens is selected, which satisfies f = working distance WD x camera target size (h)/ field of view HF.

10. A controller, characterized by comprising a memory and a processor, where the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the lighting and shooting method according to any one of claims 7-9.