KR101234935B1 - Inspection device of illumination and inspection method of illumination - Google Patents

Abstract

The present invention relates to an illumination inspection apparatus and an illumination inspection method, the reflector for reflecting the light emitted from the illumination device is driven with a rotating shaft; A reflection direction adjusting unit driving the reflection unit; A measuring unit measuring the intensity of light reflected from the reflecting unit; And a control unit controlling the reflection direction adjusting unit and the measuring unit. The control unit is to store the intensity of light measured by the measuring unit while varying the angle θ1 formed between the normal line of the reflecting portion passing through the center of the rotation axis and the imaginary line connected from the measuring unit to the rotation axis Can be.

Description

Lighting inspection device and lighting inspection method {INSPECTION DEVICE OF ILLUMINATION AND INSPECTION METHOD OF ILLUMINATION}

The present invention relates to a lighting inspection apparatus and a lighting inspection method.

Various products are made through automated processes. For these products, there are few defects, and it is very inefficient to inspect these defects one by one manually. Therefore, the automatic light inspection method is introduced to inspect the defects of such mass-produced products, and is widely used for defect inspection purposes such as substrates, electronic chips, and printed materials.

As shown in FIG. 1, the automatic light inspector used in the automatic light inspection method is composed of a high-performance camera, a lens, and appropriate lighting. The image obtained by the optical system is calculated using an image algorithm to detect foreign objects, breakage, Various defects such as deformation and scratch can be detected automatically.

On the other hand, in order to perform the automatic light inspection method quickly and accurately it can be said that the design and layout of the appropriate lighting device is most important.

For example, in the case of inspecting a product having a surface defect by an automatic light inspection method, the defect may be clearly detected or not according to the characteristics of light emitted from the lighting device.

In addition, the types of products to be subjected to automatic light inspection are not only diverse, but also various types of defects to be inspected in a specific product.

Therefore, the lighting device has to vary the required characteristics or conditions depending on the type of product to be inspected and the type of defect.

However, conventionally, in mounting the lighting device to the automatic light inspection equipment, it is possible to measure or inspect the spatial brightness distribution of the light emitted by the mounted lighting device, the brightness distribution according to the angle incident on the surface of the inspection object. There was no equipment or way to do it.

In addition, in the design and manufacturing process of the lighting device due to the unexpected factors, such as the failure of the lighting device itself, or the characteristics of the produced lighting device did not meet the requirements, but these poor lighting devices efficiently There was no equipment or method to sort out.

The present invention devised to solve the above problems, an object of the present invention is to provide a light inspection device and a light inspection method that can quickly and precisely inspect a variety of lighting devices.

The lighting inspection apparatus according to an embodiment of the present invention, which is designed to achieve the above object, reflects the light emitted from the lighting device and is provided with a rotating shaft; A reflection direction adjusting unit driving the reflection unit; A measuring unit measuring the intensity of light reflected from the reflecting unit; And a control unit controlling the reflection direction adjusting unit and the measuring unit. It includes, wherein the control unit is to store the brightness of the light measured by the measuring unit while changing the angle θ1 formed by the normal line of the reflecting portion passing through the center of the rotation axis and the imaginary line connected from the measuring unit to the rotation axis Can be.

In addition, the lighting inspection apparatus according to another embodiment of the present invention, the reflection unit for reflecting light emitted from the lighting device; A measuring unit which measures the intensity of light reflected by the reflecting unit and drives the center point of the reflecting unit as an axis; A measuring direction adjusting unit driving the measuring unit; And a control unit controlling the measuring unit and the measuring direction adjusting unit, wherein the control unit changes the angle θ2 formed by a normal line of the reflecting unit passing through the center point and an imaginary line connecting the center point from the measuring unit. It may be to store the brightness of the light measured by the measuring unit.

The optical system may further include an imaging optical system provided between the reflecting unit and the measuring unit to reflect light from one point on the reflecting unit and proceed in a predetermined direction.

The lighting apparatus may further include an illumination position adjusting unit adjusting the position of the lighting apparatus, and the control unit may also control the lighting position adjusting unit.

In addition, the measuring unit, a lens for receiving light; And an image sensor converting light passing through the lens into an electrical signal.

The controller may include a first calculator that matches the θ1 and the luminance information according to θ1.

The controller may include a second calculator that matches the θ2 and the luminance information according to θ2.

In addition, a reference line may be provided on the surface of the reflecting unit side of the measuring unit.

On the other hand, the lighting inspection method according to an embodiment of the present invention, (A) aligning the lighting device, the reflector and the measuring unit; (B) measuring brightness information while changing the θ1 or θ2; And (C) storing the measurement result measured in the step (B).

At this time, between the step (B) and the step (C), (b1) moving the lighting device; And (b2) feeding back to the step (B) only when the lighting device is not moved to a preset position.

In addition, after the step (C), (D) comparing the measurement result stored in the step (C) with a steady state value; may further include.

The lighting inspection apparatus and the lighting inspection method according to an embodiment of the present invention configured as described above by measuring the light distribution characteristics of the lighting device, to determine whether the lighting device is defective, the distribution characteristics of the brightness according to the illumination angle of the lighting device It provides a useful effect that it can be used as reference data in the auto light inspection process later.

1 is a view schematically illustrating a configuration of a conventional automatic light inspection equipment.
2 is a view schematically showing an illumination inspection device according to an embodiment of the present invention.
3 is a graph schematically illustrating a distribution of illumination intensity according to a change in incident angle.
4 is a view schematically illustrating a modification of the lighting inspection apparatus according to an embodiment of the present invention.
5 is a view schematically showing an illumination inspection device according to another embodiment of the present invention.
6 is a view schematically illustrating a modification of the main part of the lighting inspection apparatus according to an embodiment of the present invention.
7 is a flowchart illustrating a lighting inspection method according to an embodiment of the present invention.

The advantages and features of the present invention and the techniques for achieving them will be apparent from the following detailed description taken in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. The present embodiments are provided so that the disclosure of the present invention is not only limited thereto, but also may enable others skilled in the art to fully understand the scope of the invention. Like reference numerals refer to like elements throughout the specification.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, 'comprise' and / or 'comprising' refers to a component, step, operation and / or element that is mentioned in the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the present invention.

2 is a view schematically showing an illumination inspection device 100 according to an embodiment of the present invention.

2, the lighting inspection apparatus 100 according to an exemplary embodiment of the present invention may include a reflector 110, a reflection direction adjuster, a measurer 120, and a controller 130.

The reflector 110 may be driven with a rotating shaft, and may perform a function of reflecting light emitted from the lighting device 1.

The reflection direction adjustment unit (not shown) may drive the reflection unit 110 to adjust a reflection direction of light emitted from the lighting device 1.

The reflection direction adjusting unit may be implemented by a general motor and a gear.

Although not shown, the reflective part 110 and the reflective direction adjusting part may be fixed to the cradle of various shapes.

The measurement unit 120 may include a lens 121 for receiving light and a conventional image sensor 122 for reaching the light received by the lens 121 and converting an optical signal into an electrical signal.

In addition, the lens 121 may be composed of a plurality of groups and / or a sheet may be able to adjust the focus.

Accordingly, the measurement unit 120 may perform a function of measuring the luminous intensity of light reflected from the reflector 110.

Although not shown, the lighting position adjusting unit may be further provided.

The lighting position adjusting unit is mounted with a lighting device 1 can be adjusted to its position.

In this case, the controller 130 may control the lighting position adjusting unit.

The controller 130 may perform a function of controlling the reflector 110, the reflection direction adjuster, and the measurer 120.

In particular, the control unit 130 may drive the reflection unit 110 by applying a control signal to the reflection direction adjustment unit, accordingly, the normal of the reflection unit 110 passing through the center of the rotation axis of the reflection unit 110 And measure the intensity of light while varying θ, which is an angle formed by an imaginary line connected from the measurement unit 120 to the rotation axis, to be stored.

In this case, φ on the drawing is an angle formed by the virtual line connecting the center of the rotation axis of the reflecting unit 110 and the virtual line connected from the measuring unit 120 to the rotation axis in the lighting device (1).

Light generated by the lighting device 1 is reflected from the surface of the reflector 110 and is incident on the measurement unit 120 or proceeds to the periphery of the measurement unit 120. In particular, only light having a relationship of Φ = 2θ is established. Optionally incident to the measuring unit 120.

On the other hand, in order to more accurately measure the light intensity distribution according to θ, it is preferable to narrow the range of light received by the measuring unit 120. To this end, a method of increasing the F value of the lens used in the measuring unit 120 or closing the iris to the maximum may be used, and to use only the data sensed in a predetermined region corresponding to the center of the image sensor 122. It can also be done in software.

The controller 130 may include a calculator to match luminance information according to θ with the θ.

As illustrated in FIG. 3, the illumination intensity is changed according to the angle of incidence, and the distribution of the illumination intensity according to the angle of incidence of the inspection target lighting device 1 may be determined by measuring the intensity of light while varying θ as described above.

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On the other hand, an imaging optical system (not shown) may be provided between the reflector 110 and the measurement unit 120.

The imaging optical system reflects or bends the light traveling in a specific direction among the light reflected at one point on the reflector 110 to form an image on the image sensor 122 via the lens 121 of the measurement unit 120. Function to make it work.

In this case, the imaging optical system may be implemented using a plurality of mirrors, lenses 121 and / or prisms.

4 is a view schematically illustrating a modification of the lighting inspection apparatus 100 according to an embodiment of the present invention.

In FIG. 2, the reflective unit 110 is driven two-dimensionally. However, as illustrated in FIG. 4, the reflective unit 110 may be three-dimensionally driven.

5 is a view schematically showing an illumination inspection device 200 according to another embodiment of the present invention.

Hereinafter, in order to avoid overlapping description, descriptions will be made mainly on matters different from those of the embodiment illustrated in FIG. 2.

Referring to FIG. 5, the lighting inspection apparatus 200 according to another embodiment of the present invention may include a reflecting unit 210, a measuring unit 220, a measuring direction adjusting unit (not shown), and a control unit 230. .

Specifically, the measurement unit 220 may be driven by the axis of the center of the reflector 210, the measurement direction adjusting unit to drive the measurement unit 220 in accordance with the control signal of the controller 230 Can be.

Accordingly, unlike the case illustrated in FIG. 2, the reflector 210 is fixed and the measurement unit 220 may be driven.

6 is a view schematically illustrating a modification of the main part of the lighting inspection apparatus according to an embodiment of the present invention.

Referring to FIG. 6, a cross reference line 123 may be provided on a surface of the reflecting unit 110 of the measuring unit 120. At this time, although the cross-shaped reference line is illustrated in the drawing, such a figure illustrates the shape of a representative reference line for alignment, and any shape may be applied as long as it can help the alignment.

The cross reference line 123 may be used to align the measurement unit 120 and the reflector 110.

7 is a flowchart illustrating a lighting inspection method according to an embodiment of the present invention.

Lighting inspection method according to an embodiment of the present invention, may include the alignment, measurement and storage steps.

In the alignment step (S100) to align the lighting device, the reflector and the measuring unit.

The lighting apparatus may be fixed at a specific position or coupled to the lighting position adjusting unit to be moved later.

In addition, the reflector and the measurer may be aligned such that the normal of the reflector and the measurer are parallel to each other. In this case, the measurement unit may be positioned above the center point of the reflector.

Meanwhile, as illustrated in FIG. 6, a cross reference line 123 may be provided in the measuring unit 120 to be used in the alignment process.

Next, in the measuring step (S110) while changing the θ (S111) the brightness information is measured (S112). In addition, the process (S112) of measuring the brightness information is repeated while changing the angle of the reflector until the angle θ reaches the limit (S111). When the angle θ reaches the limit, the process proceeds to the next step (S113).

At this time, θ can be changed by driving the reflecting unit or driving the measuring unit.

Next, the storage step (S140) may store the measurement results measured in the measurement step (S110). In this case, the luminance information according to θ and θ may be matched and stored by the controller.

The information stored in this way can be used as reference information when the lighting device is applied to the automatic light inspection equipment to test the sample.

On the other hand, between the measuring step (S110) and the storage step (S140), the step of moving the lighting device (S120) and the feedback to the measuring step (S110) step only when the lighting device is not moved to a preset position It may further comprise a step (S130).

Accordingly, when the lighting device is mounted to the lighting position adjusting unit, brightness information may be obtained while changing the position of the lighting.

In addition, after the storing step S140, the method may further include comparing the stored measurement result with a steady state value. In this case, the steady state value may be data obtained by matching luminance information according to θ and θ with respect to the lighting device determined to be in a steady state by another method.

Accordingly, it is possible to efficiently determine whether the lighting device is defective.

The foregoing detailed description is illustrative of the present invention. In addition, the foregoing description merely shows and describes preferred embodiments of the present invention, and the present invention can be used in various other combinations, modifications, and environments. That is, it is possible to make changes or modifications within the scope of the concept of the invention disclosed in this specification, the disclosure and the equivalents of the disclosure and / or the scope of the art or knowledge of the present invention. The above-described embodiments are for explaining the best state in carrying out the present invention, the use of other inventions such as the present invention in other states known in the art, and the specific fields of application and uses of the invention are required. Various changes are also possible. Accordingly, the detailed description of the invention is not intended to limit the invention to the disclosed embodiments. It is also to be understood that the appended claims are intended to cover such other embodiments.

1: Lighting device
100, 200: lighting inspection device
110: reflector
120: measuring unit
121: Lens
122: image sensor
130: control unit

Claims (12)

A reflector which reflects the light emitted from the lighting device and is driven with a rotating shaft;
A reflection direction adjusting unit driving the reflection unit;
A measuring unit measuring the intensity of light reflected from the reflecting unit; And
A control unit controlling the reflection direction adjusting unit and the measurement unit;
Including;
The control unit stores the light intensity of the light measured by the measuring unit while varying the angle θ1 formed between the normal line of the reflecting unit passing through the center of the rotation axis and the imaginary line connected from the measuring unit to the rotation axis.
Lighting inspection device.
A reflector reflecting light emitted from the lighting device;
A measuring unit which measures the intensity of light reflected by the reflecting unit and drives the center point of the reflecting unit as an axis;
A measuring direction adjusting unit driving the measuring unit; And
A control unit controlling the measurement unit and the measurement direction adjusting unit;
Including;
The control unit stores an intensity of light measured by the measuring unit while varying an angle θ2 formed between the normal line of the reflecting unit passing through the center point and an imaginary line connecting the center point from the measuring unit.
Lighting inspection device.
The method according to claim 1 or 2,
It further comprises an imaging optical system provided between the reflecting unit and the measuring unit, the light reflecting from one point on the reflecting unit and proceeds in a predetermined direction to the imaging unit
Lighting inspection device.
The method according to claim 1 or 2,
The lighting device is mounted, the lighting position adjusting unit for adjusting the position of the lighting device; Further comprising:
The control unit also controls the lighting position adjusting unit
Lighting inspection device.
The method according to claim 1 or 2,
The measuring unit
A lens that receives light; And
An image sensor converting light passing through the lens into an electrical signal;
To include
Lighting inspection device.
The method of claim 1,
The control unit,
It includes a first calculation unit for matching the θ1 and the brightness information according to the θ1
Lighting inspection device.
The method of claim 2,
The control unit,
It includes a second operation unit for matching the θ2 and the brightness information according to θ2
Lighting inspection device.
The method according to claim 1 or 2,
The reference line is provided on the surface of the reflector side of the measurement unit
Lighting inspection device.
In the method of inspecting lighting using the lighting inspection device according to claim 1,
(A) aligning the lighting device, the reflecting unit and the measuring unit;
(B) measuring brightness information while changing the θ1; And
(C) storing the measurement result measured in the step (B);
Containing
Lighting inspection method.
In the method of inspecting the light using the lighting inspection device according to claim 2,
(A) aligning the lighting device, the reflecting unit and the measuring unit;
(B) measuring brightness information while changing the θ2; And
(C) storing the measurement result measured in the step (B);
Containing
Lighting inspection method.
11. The method according to claim 9 or 10,
Between step (B) and step (C),
(b1) moving the lighting device; And
(b2) feeding back to the step (B) only when the lighting device is not moved to a preset position;
Further comprising
Lighting inspection method.
11. The method according to claim 9 or 10,
After the step (C),
(D) comparing the measurement result stored in the step (C) with a steady state value;
More,
The steady state value is a data including luminance information of the lighting apparatus determined to be in a steady state.
Lighting inspection method.

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