KR-20260065402-A - Lighting control system and lighting control method

KR20260065402AKR 20260065402 AKR20260065402 AKR 20260065402AKR-20260065402-A

Abstract

The present invention relates to a lighting control system and a lighting control method capable of automatically implementing an optimal lighting state that can improve the identification ability of all of various objects, and may include: a first lighting group that irradiates light onto a first object; a second lighting group that irradiates light onto a second object; a camera that photographs the first object and the second object; and a control unit that controls the intensity of the lighting of the first lighting group and the second lighting group using an optimal lighting value calculated using first identification information and second identification information.

Inventors

김호승

Assignees

세메스 주식회사

Dates

Publication Date: 20260508
Application Date: 20241101

Claims (10)

A first illumination group comprising at least one light-emitting body that irradiates light onto a first object; A second illumination group comprising at least one light-emitting body that irradiates light onto a second object having a shape different from the first object; A camera for photographing the first object and the second object; and A control unit that obtains first identification information for the first object by analyzing an image of the first object captured by the camera while adjusting the intensity of the lighting of the first lighting group, obtains second identification information for the second object by analyzing an image of the second object captured by the camera while adjusting the intensity of the lighting of the second lighting group, and controls the intensity of the lighting of the first lighting group and the second lighting group using an optimal lighting value calculated using the first identification information and the second identification information; A lighting control system including
In Article 1, The first illumination group is a plurality of light-emitting elements that irradiate light at various angles toward the first object, and The second lighting group comprises a plurality of light-emitting elements installed between or near the first lighting groups to irradiate light toward the second object at various angles, and The above control unit is, A first search unit that sequentially applies an input voltage of the first lighting group from a minimum value to a maximum value so as to first change the lighting intensity of the first lighting group in a scanning manner; A first large-scale optimal value calculation unit that calculates an approximate first large-scale optimal value by analyzing the identification information of the first image of the first object captured by the camera; A second search unit that sequentially applies an input voltage to the first lighting group, ranging from a negative (-) large-scale estimated value obtained by subtracting a predetermined large-scale amount from the calculated first large-scale optimal value to a positive (+) large-scale estimated value obtained by increasing a predetermined large-scale amount from the calculated first large-scale optimal value, so as to secondarily change the lighting intensity of the first lighting group by a scanning method; A first small-unit optimal value calculation unit that calculates a precise small-unit optimal value by analyzing identification information of a second image of the first object captured by the camera; and A first lighting value determining unit that determines the second input voltage value of the first lighting group using the calculated small-unit optimal value; A lighting control system including
In Article 2, The above control unit is, A third search unit that sequentially applies the input voltage of the second lighting group from a minimum value to a maximum value so as to first change the lighting intensity of the second lighting group in a scanning manner when the input voltage of the first lighting group is fixed; A second large-scale optimal value calculation unit that calculates an approximate second large-scale optimal value by analyzing the identification information of the first image of the second object captured by the camera; A fourth search unit that sequentially applies an input voltage to the second lighting group, ranging from a negative (-) large-scale estimated value obtained by subtracting a predetermined large-scale from the calculated second large-scale optimal value to a positive (+) large-scale estimated value obtained by increasing a predetermined large-scale from the calculated second large-scale optimal value, so as to secondarily change the lighting intensity of the second lighting group using a scanning method; A second small-unit optimal value calculation unit that calculates a precise small-unit optimal value by analyzing the identification information of the second image of the second object captured by the camera; and A second lighting value determining unit that determines the second input voltage value of the second lighting group using the calculated small-unit optimal value; A lighting control system that further includes
In Paragraph 3, The above control unit is, An identification change detection unit that obtains identification change information for the first object by analyzing an image of the first object captured by the camera while varying the input voltage value of the second lighting group from the first input voltage value of the first lighting group to the second input voltage value while the first input voltage value of the first lighting group is fixed; and A final illumination value determination unit that determines the input voltage value at the crossover point where the identification information of the first object decreasing and the identification information of the second object increasing intersects as the final input voltage value; A lighting control system that further includes
In Article 1, The first object above includes a ball of a semiconductor package, and The second object above includes a mark or outline of a semiconductor package, and The above control unit is, A lighting control system that, upon acquiring the first identification information, calculates the ratio of the number of pixels (area) of the outer bright part and the number of pixels of the inner dark part in the image of the ball captured by the camera, divides the outer bright part and the inner dark part of the image of the ball captured by the camera into equal angles to detect the angle of each part and calculates the concentricity of the image of the ball using the average thereof, and determines the lighting value of the image that is closest to a reference value and simultaneously has the best concentricity as the first input voltage value.
In Article 5, The above control unit is, A lighting control system that, upon acquiring the second identification information, removes noise from the image when the mark or outline image of the semiconductor package captured by the camera is a mark, generates bright and dark areas using a histogram when the image is an outline, emphasizes them by assigning weights, detects the boundary between the bright and dark areas using the peak values of the histogram, and determines the boundary between the bright and dark areas using the height and distance between the peak values of the histogram, and determines the lighting value of the best possible image as the second input voltage value based on the generated image.
(a) a step of irradiating a first object with light using a first illumination group consisting of at least one light source; (b) a step of photographing the first object with a camera; (c) a step of obtaining first identification information for the first object by analyzing an image of the first object captured by the camera while adjusting the intensity of the illumination of the first illumination group; (d) a step of irradiating light onto a second object having a shape different from the first object using a second illumination group consisting of at least one light source; (e) a step of obtaining second identification information for the second object by analyzing an image of the second object captured by the camera while adjusting the intensity of the illumination of the second illumination group; and (f) a step of controlling the intensity of the lighting of the first lighting group and the second lighting group using an optimal lighting value calculated using the first identification information and the second identification information; A lighting control method including
In Article 7, The above step (c) is, (c-1) A step of sequentially applying an input voltage of the first lighting group from a minimum value to a maximum value so as to first change the lighting intensity of the first lighting group in a scanning manner; (c-2) A step of calculating an approximate first large-scale optimal value by analyzing the identification information of the first image of the first object captured by the camera; (c-3) A step of sequentially applying an input voltage to the first lighting group, from a negative (-) large-scale estimated value obtained by subtracting a predetermined large-scale from the calculated first large-scale optimal value, to a positive (+) large-scale estimated value obtained by increasing a predetermined large-scale from the calculated first large-scale optimal value, so as to secondarily change the lighting intensity of the first lighting group by a scanning method; (c-4) A step of calculating a precise small-unit optimal value by analyzing the identification information of the secondary image of the first object captured by the camera; and (c-5) A step of determining the second input voltage value of the first lighting group using the calculated small-unit optimal value; A lighting control method including
In Article 8, The above step (e) is, (e-1) A step of sequentially applying the input voltage of the second lighting group from a minimum value to a maximum value so that, with the input voltage of the first lighting group fixed, the lighting intensity of the second lighting group can be changed first by a scanning method; (e-2) A step of calculating an approximate second large-scale optimal value by analyzing the identification information of the first image of the second object captured by the camera; (e-3) A step of sequentially applying an input voltage to the second lighting group, from a negative (-) large-scale estimated value obtained by subtracting a predetermined large-scale from the calculated second large-scale optimal value to a positive (+) large-scale estimated value obtained by increasing a predetermined large-scale from the calculated second large-scale optimal value, so as to enable the second lighting group's lighting intensity to be changed by a scanning method; (e-4) A step of calculating a precise small-unit optimal value by analyzing the identification information of the secondary image of the second object captured by the camera; and (e-5) A step of determining the second input voltage value of the second lighting group using the calculated small-unit optimal value; A lighting control method including
In Article 9, The above (f) step is, (f-1) A step of obtaining information on the change in identification degree of the first object by analyzing an image of the first object captured by the camera while varying the input voltage value of the second lighting group from the first input voltage value of the first lighting group to the second input voltage value, while the first input voltage value of the first lighting group is fixed; (f-2) A step of determining the input voltage value at the crossover point where the identification information of the first object decreasing and the identification information of the second object increasing intersect as the final input voltage value; and (f-3) A step of controlling the intensity of the lighting of the first lighting group and the second lighting group with the determined final input voltage value; A lighting control method including

Description

Lighting control system and lighting control method The present invention relates to a lighting control system and a lighting control method, and more specifically, to a lighting control system and a lighting control method capable of automatically implementing an optimal lighting state that can improve the identification ability of all of various objects. A semiconductor manufacturing process is a process for manufacturing semiconductor devices on a substrate (e.g., a wafer) and may include, for example, photolithography, deposition, etching, ion implantation, cleaning, etc. In order to perform each manufacturing process normally, various inspection equipment can be used to inspect manufactured semiconductor packages with a camera and classify them, for example, into good products, rework products, and defective products. For these inspection devices, it is very important to control the intensity (brightness) of the lighting to improve the camera's identification ability depending on the type of inspection target, but conventionally, skilled workers manually determined and applied the intensity of the lighting at their own discretion. FIG. 1 is a conceptual diagram showing a lighting control system according to some embodiments of the present invention. Figure 2 is a diagram showing an example of an image captured by a camera of the lighting control system of Figure 1. Figure 3 is a block diagram showing the control unit of the lighting control system of Figure 1. Figure 4 is a graph showing the information processing process of the control unit of the lighting control system of Figure 1 in stages. FIG. 5 is a flowchart illustrating a lighting control method according to some embodiments of the present invention. Figure 6 is a flowchart illustrating step (c) of the lighting control method of Figure 5 in more detail. Figure 7 is a flowchart illustrating step (e) of the lighting control method of Figure 5 in more detail. Figure 8 is a flowchart showing step (f) of the lighting control method of Figure 5 in more detail. Hereinafter, several preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The embodiments of the present invention are provided to more fully explain the invention to those skilled in the art, and the following embodiments may be modified in various different forms, and the scope of the invention is not limited to the following embodiments. Rather, these embodiments are provided to make the disclosure more faithful and complete and to fully convey the spirit of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of explanation. The terms used herein are for describing specific embodiments and are not intended to limit the invention. As used herein, the singular form may include the plural form unless the context clearly indicates otherwise. Additionally, as used herein, "comprise" and/or "comprising" specify the presence of the mentioned features, numbers, steps, actions, parts, elements, and/or groups thereof, and do not exclude the presence or addition of one or more other features, numbers, actions, parts, elements, and/or groups. Hereinafter, embodiments of the present invention are described with reference to drawings that schematically illustrate ideal embodiments of the present invention. In the drawings, variations of the illustrated shapes may be expected, for example, depending on manufacturing techniques and/or tolerances. Accordingly, embodiments of the inventive concept should not be interpreted as being limited to specific shapes of the areas illustrated herein, but should include, for example, variations in shape resulting from manufacturing. FIG. 1 is a conceptual diagram showing a lighting control system (100) according to some embodiments of the present invention, and FIG. 2 is a diagram showing an example of an image captured by a camera (30) of the lighting control system (100) of FIG. 1. First, as illustrated in FIGS. 1 and 2, a lighting control system (100) according to some embodiments of the present invention may largely include a first lighting group (10), a second lighting group (20), a camera (30), and a control unit (40). The first lighting group (10) may be composed of at least one channel of lights controlled by a plurality of light-emitting bodies (11)(12)(13)(14)(15) that irradiate light onto various first objects (1) that are the subject of photography or inspection of the camera (30). Here, the first object (1) may be a semiconductor package processed in the cutting and sorting process of a semiconductor package, a ball, a mark, or an outline of various objects. More specifically, for example, the first lighting group (10) may be a plurality of light-emitting elements such as LEDs arranged in a shape surrounding the first object (1) and irradiating light toward the first object (1) at various angles.