KR101040747B1 - Optical member with improved durability and light apparatus for inspection - Google Patents

Abstract

PURPOSE: A lighting apparatus for inspection equipped with an optical member having improved durability is provided to remove possibility of scratches and exfoliation by attaching an AR-coated anti-reflective plate of an acrylic material instead of an anti-reflective layer on a lower surface of a floodlighting plate. CONSTITUTION: A lighting apparatus for inspection comprises: an optical member; a light irradiation unit; and a frame(111). The optical member includes a floodlighting plate(121) having a plurality of reflective dots(122) for reflecting incident light to a lower direction and a first anti-reflective plate(123) attached apart from the floodlighting plate by an adhering member coated around a lower surface of the floodlighting plate. The light irradiation unit irradiates the light on a lateral surface of the floodlighting plate. The frame is formed to support the optical member and the light irradiation unit and has an open upper part and an open inside of a lower part.

Description

Optical member with improved durability and light apparatus for inspection}

The present invention relates to a lighting device for inspection, and more particularly, in a floodlight plate to reflect the light incident from the side down to observe the object, by attaching an acrylic plate on the upper and lower sides of the floodlight plate The present invention relates to an optical member having improved durability for protecting a floodlight plate from a risk factor and an inspection lighting device having the same.

Inspection lighting apparatus refers to a device that irradiates light to inspect the appearance of the product by using an imaging device such as a CCD camera.

Among them, the inspection illumination device called 'flat dome lighting' is configured to irradiate the light incident from the side to the lower side where the inspection object is located, and to obtain an image of the object with an imaging device such as a CCD camera from above. Say the device. In other words, the flat dome illumination is easy to check the abnormality of the product because it irradiates light from the same direction as the observation axis of the imaging device, and the illumination using the existing half mirror implemented for irradiating light for similar purposes. Compared to the device, the thickness can be greatly reduced and the light diffusion performance is excellent, and the demand is increasing.

1 is a view for explaining a process of inspecting an object using a conventional inspection illumination device (flat dome illumination).

As shown in Fig. 1, in the conventional inspection lighting device 1, the optical member 3 is fixed by the frame 2 with the upper and lower inner sides open, and the side surface 31c of the optical member 3, namely, When light is irradiated from the light source part 5 which consists of the PCB 52 and LED 51 which were provided in the inner periphery of the frame 2, this light is reflected by the optical member 3 below and irradiated, and the optical member 3 When light is irradiated to the object (W) located below the), the CCD camera (6) located above the optical member (3) is to obtain an image of the object (W) to perform the inspection. That is, since light can be irradiated from the same direction as the imaging axis C of the CCD camera 6, the abnormality of a product can be confirmed more correctly.

The optical member 3 mounted in such a conventional inspection lighting device 1 includes a transparent glass transparent plate 31, a plurality of reflecting portions 32 provided on the upper surface 31b of the transparent plate, and a transparent light. It consists of an anti-reflection film 33 attached to the lower surface 31a of the plate 31, and the light incident on the side of the floodlight plate 31 is totally reflected in the floodlight plate 31, the light is partially It uses the principle reflected by the reflecting part 32 and irradiated below the floodlight plate 31. In addition, when the light irradiated below the floodlight plate 31 reflects off the object W, the reflected light is reflected through the gaps of the reflectors 32 provided on the upper surface 31b of the floodlight plate 31. It may be incident on (6). This makes sense as there is no problem in observing the condition across the steel net.

Here, in the conventional inspection lighting device 1 shown in Fig. 1, an antireflection film 33 is attached to the lower surface 31a of the optical member 3 to suppress the reflection of light and improve the transmittance. . That is, the anti-reflection film 33 is attached in order to prevent the captured image from being damaged due to the diffuse reflection of light. The thin anti-reflection film 33 is weak in durability and is likely to be scratched by equipment or products. That is, when the minute scratch marks remain on the anti-reflection film 33, the scratch marks remain in the captured image, thereby increasing the possibility that an error may occur in the inspection process.

In addition, in order to clean or repair the inspection lighting device 1, the optical member 3 may be detached from the frame 2, and in this process, there is a high possibility that the antireflection film 33 may be scratched. As the boundary between the thin anti-reflection film 33 and the light transmissive plate 31 is exposed, there is a problem in that the anti-reflection film 33 is easily separated from the light transmissive plate 31. Of course, the anti-reflection film 33 may be reattached by using water, but foreign matter such as dust may be caused by the static electricity generated while the anti-reflection film 33 is separated from the light-transmitting plate 31. 33) and rubs the floodlight plate 31 or the anti-reflection film 33 to wipe the teeth, the more likely to be scratched by foreign matter.

The present invention has been made to solve the problems of the prior art as described above, by attaching the anti-reflective plate of the acrylic coating AR-treated in place of the anti-reflection film on the lower surface of the transparent plate, the possibility of scratching and peeling It is an object of the present invention to provide an optical member having improved durability and an inspection lighting device equipped with the same.

In addition, by attaching silicon around the transparent plate and the anti-reflective plate to be spaced apart from each other, the optical member with improved durability that can prevent the occurrence of water ripples due to the adhesion imbalance between the transparent plate and the anti-reflective plate and Another object is to provide an inspection lighting device equipped with the same.

In addition, by attaching both the upper surface and the lower surface of the floodlight plate with an AR coated antireflection plate, the antireflection film is detached even when the optical member is separated from the frame, eliminating the possibility of foreign matter being attached by static electricity. Another object is to provide an improved optical member that is easy to maintain and an inspection lighting device equipped with the same.

The optical member with improved durability according to the present invention for achieving the above object is a light-transmitting plate provided with a plurality of reflective dots on the upper surface to reflect the light incident to the side downward; And a first anti-reflection plate attached to the light transmissive plate at a predetermined interval apart by an adhesive material applied along the circumference of the lower surface of the light transmissive plate.

Here, the first anti-reflective plate is a transparent acrylic plate coated with AR, and the silicon and the adhesive material along the circumference in the state spaced apart by a predetermined interval to face the translucent plate and the first anti-reflective plate to adhere to each other It is preferable.

The apparatus may further include a second anti-reflection plate attached to the light transmissive plate at a predetermined interval apart by an adhesive material applied along a circumference of the upper surface of the light transmissive plate.

On the other hand, the inspection illumination device for achieving the above object, the inspection illumination device equipped with the optical member, the light irradiation unit for irradiating light from the side of the floodlight plate; And a frame supporting the optical member and the light irradiation part and having upper and lower inner sides thereof open. It includes.

According to the optical member and the inspection lighting apparatus equipped with the improved durability according to the present invention has the following effects.

First, by attaching an anti-reflective plate made of an acrylic coating to the upper and lower surfaces of the light transmitting plate to remove diffuse reflection and increase the transmittance of light, thereby increasing the durability of the optical member including the light transmitting plate. Can give That is, the conventional anti-reflection film is weak to scratches, and once scratched, the scratches remain intact on the captured image, but an error may occur during the inspection process. However, in the present invention, the anti-reflection of the acrylic material having a durable AR coating treatment may be used. Since the plate is not easily scratched, the possibility of inspection error due to scratches can be significantly reduced.

Second, by attaching the light transmissive plate and the antireflective plate using silicon, even if the optical member is separated from the frame, the antireflective plate does not deviate from the transmissive plate, so maintenance is easy. That is, in the conventional anti-reflective coating method, when the optical member is separated from the frame, the boundary portion between the transparent plate and the surface on which the anti-reflective coating is attached is exposed and easily peeled off, and due to the static electricity generated while the anti-reflective coating is peeled off. There was a high possibility of foreign matter sticking to the transparent plate and the anti-reflection film, and the foreign matter was likely to be damaged by scratching the anti-reflection film or the light-transmitting plate in the process of rubbing to remove the foreign matter, but in the present invention, the anti-reflective plate is separated from the light-transmitting plate. Since there is no fear of washing, the surface of the anti-reflective plate of the upper and lower parts can be cleaned conveniently.

Third, since the transparent plate and the anti-reflective plate are attached to the circumferentially spaced state by applying silicon, the light-transmissive plate and the anti-reflective plate can be prevented from generating a wave pattern due to close unbalance. That is, if the floodlight plate and the anti-reflection plate are in close contact with each other, the specific area may be more closely contacted with each other than the other areas due to the attraction of each other, thereby generating fine deformation and distorting the horizontal plane. Patterning occurs, which is an obstacle to the inspection process. Therefore, in the present invention, since the silicon is coated around the light transmitting plate and the antireflection plate and attached in a state where they are spaced apart from each other, there is no fear of occurrence of wave pattern during the inspection process.

1 is a view for explaining a process of inspecting an object using a conventional inspection lighting device.
Figure 2 is an exploded perspective view for explaining the optical member and the inspection lighting device equipped with the same according to an embodiment of the present invention.
Figure 3 is a perspective view for explaining the combined state of the optical member shown in Figure 2 and the inspection lighting apparatus mounted therewith.
4 is a view for explaining a process of inspecting an object using the optical member shown in Figure 2 and the inspection lighting device equipped with the same.
FIG. 5 is a cross-sectional view of the optical member exaggerated for explaining the configuration of the optical member shown in FIG. 2; FIG.
6 is a view for explaining a wave pattern phenomenon caused by pressing when the transparent plate and the anti-reflection plate is in close contact with each other.
7 is a view for explaining a test lighting device according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described. However, some components irrelevant to the gist of the present invention will be omitted or compressed, but the omitted elements are not necessarily required in the present invention, and may be combined and used by those skilled in the art. Can be.

Figure 2 is an exploded perspective view for explaining the inspection lighting device 100 according to an embodiment of the present invention, Figure 3 is a perspective view for explaining the combined state of the inspection lighting device 100, Figure 4 is a test A diagram for describing a process of inspecting an object 170 using the lighting device 100 for dragons.

2 to 4, the inspection lighting apparatus 100 according to the embodiment of the present invention includes a frame 110, a light irradiation unit 130, a PCB guide 140, and an optical member 120. do.

The frame 110 is composed of a lower main frame 111 and an upper cover frame 112, and an opening part a 111a and an opening part b (inside the main body frame 111 and the cover frame 112, respectively). 112a) is formed. The body frame 111 and the cover frame 112 are substantially square, and the shapes of the openings a 111a and the opening b 112a are also square, but are not necessarily limited to shapes, and may be circular according to implementation.

The outer side of the main body frame 111 has a stepped structure so that the height is higher than the inner side. A guide protrusion 111b for holding the position of the optical member 120 protrudes from the inner bottom of the main body frame 111 at the corner where each side meets, and the optical member 120 is seated on the main body frame 111. The lower surface of the guide protrusion 111b does not cause any of the deflections. In addition, a PCB groove 111c into which the PCB 132 of the light irradiation unit 130 is erected and inserted is formed at the inner bottom of the main body frame 111 in the longitudinal direction. In addition, a cable hole into which the cable 133 for supplying power to the LED 131 of the light irradiation part 130 is formed is formed in the outer side surface of any one side of the main body frame 111.

The light irradiator 130 includes an LED 131 and a PCB 132 so as to be powered by the cable 133 and emit light. The light irradiator 130 is composed of four PCBs 132 having a plurality of LEDs 131 coupled in a row, and each PCB 132 is formed on the inner bottom of the main body frame 111. Inserted into and seated in

On the other hand, even if the lower portion of the PCB 132 of the light irradiation unit 130 is inserted into the PCB groove 111c of the main body frame 111, because the upper portion may shake and cause a malfunction, the upper portion of the PCB 132 is fixed PCB guide 140 for fixing is fixed to the outer upper end of the body frame (111).

PCB guide 140 is a point is seated in the guide seating groove (111d) formed on the outer top of the main frame 111 is fixed through a fastening means such as bolts, the fitting formed at the bottom of the portion extending from the fixed point By inserting the upper portion of the PCB 132 into the groove 141, the PCB 132 can be supported without shaking. The PCB guide 140 is preferably fixed to each side of the outer top of the main body frame 111 to support each PCB 132.

When the optical member 120 is irradiated with light from the LED 131 positioned on the side, the optical member 120 is a configuration for uniformly reflecting the incident light downward to irradiate the light to the object 170, a detailed description of the optical member 120 Will be described again below.

The cover frame 112 is upper part of the main body frame 111 in a state in which the light irradiation part 130 and the optical member 120 are placed in the main body frame 111 and the PCB guide 140 supports the upper part of the PCB 132. By coupling to the inspection lighting device 100 is completed.

The combined structure, operation principle, and features of the present invention in the completed inspection lighting device 100 will be described with a schematic cross-sectional view shown in the use state diagram of FIG. 4 and an exaggerated cross-sectional view of FIG. 5.

As shown in Figs. 4 and 5, the optical member 120 is supported with a part of the circumference settled inside the main body frame 111 and the cover frame 112. In addition, the PCB 132 of the light irradiation unit 130 that irradiates light from the side of the optical member 120 is seated and supported by the PCB groove 111c formed at the lower part of the main body frame 111, and the upper part is supported at the main body frame 111. It is seated and supported in the fitting groove 141 of the fixed PCB guide 140.

The optical member 120 reflecting the light generated from the LED 131 of the light irradiation unit 130 on the side downward is a light transmitting plate 121, a first antireflection plate 123 and a second antireflection plate 124. It consists of. The light transmissive plate 121, the first antireflection plate 123, and the second antireflection plate 124 appear to be in close contact with each other on the surface thereof, but are attached at substantially spaced intervals. That is, FIG. 5 shows the optical member 120 very exaggerated to explain the relationship between the respective components of the optical member 120.

The floodlight plate 121 of constant thickness is made of transparent glass or acrylic. When the LED 131 of the light irradiator 130 emits light and light enters the side of the floodlight panel 121, the light is reflected and advanced in the floodlight panel 121, and then the reflection is provided on the upper surface of the floodlight panel 121. The light is reflected from the dot 122 and diffused downward of the floodlight plate 121.

The reflective dot 122 is a very small and thin configuration having a diameter of approximately tens of micrometers in a two-layer structure of a reflective layer 122a that diffusely reflects light and a blocking layer 122b that hardly reflects light. The reflective dot 122 forms a predetermined rule and is provided on the upper surface of the floodlight plate 121.

Therefore, the light incident from the side surface of the floodlight plate 121 is reflected by the reflection dot 122 and diffused and irradiated downward of the floodlight plate 121, thereby uniforming the object 170 positioned below the floodlight plate 121. One light irradiation becomes possible. In addition, when the object 170 is photographed by an imaging device such as a CCD camera 160 above the floodlight plate 121, light is uniformly diffused downwardly from the floodlight plate 121 to be reflected by the object 170. The reflected light is again incident on the imaging device above the floodlight plate 121 to obtain an image. This is the same reason that the state of the other side can be observed through the steel mesh.

On the other hand, the first anti-reflection plate 123 is attached to the lower portion of the transparent plate 121. The first anti-reflective plate 123 is to improve the transmittance of light reflected from the object 170, and is preferably a transparent acrylic plate treated with an anti-reflective coating. Conventionally, an anti-reflection film is attached to improve the transmittance in the lower part of the light transmitting plate. However, in this embodiment, since the durable acrylic plate is attached, it is possible to eliminate the fear of leaving scratches on equipment or the like.

Here, the first anti-reflection plate 123 and the floodlight plate 121 are preferably attached at a predetermined interval. As shown in FIG. 6, when the first antireflection plate 123 and the floodlight plate 121 are completely attached to each other, the first antireflection plate 123 and the floodlight plate 121 are closely contacted with each other. There is a possibility of moire pattern. That is, if the floodlight plate 121 and the first anti-reflective plate 123 is in close contact with each other, specific areas may be more closely contacted with each other than other areas due to the attraction between each other, thereby generating fine deformation and distorting the horizontal plane. Because of this, light may be refracted to cause a wave pattern phenomenon, which is a fatal error since an accurate image cannot be obtained during the inspection process.

Therefore, in the present embodiment, the first anti-reflective plate 123 and the light-transmitting plate 121 face each other and the silicon plate 125, which is an adhesive material along the circumference, is separated from each other by a predetermined interval, and the two plates are spaced apart from each other. It is attached. Therefore, it is possible to prevent the occurrence of wavy patterns due to the closeness imbalance.

In addition, when the anti-reflection film is conventionally attached, when the optical member is detached from the frame for cleaning or repair, the interface between the anti-reflection film and the floodlight plate is exposed so that the anti-reflection film may easily fall off. In some cases, the foreign matter between the floodlights caused foreign matters to get on.

However, in this embodiment, since the transparent plate 121 and the first anti-reflective plate 123 are completely attached with an adhesive material called silicon 125, the adhesive strength is very strong and excellent in durability. It is impossible to penetrate between the dog's plates. Therefore, since the cleaning can be completed only by wiping the lower portion of the first anti-reflection plate 123, maintenance can be facilitated.

Similarly, by attaching the second anti-reflective plate 124 of the acrylic coating AR coated using the silicon 125 on the top of the light transmitting plate 121, it is possible to protect both the upper and lower parts of the light transmitting plate 121, optical Maintenance of the member 120 becomes easier.

On the other hand, Figure 7 is a view for explaining the inspection lighting device according to another embodiment of the present invention. That is, in the inspection lighting apparatus shown in FIG. 7, the white tape 150 is attached to a portion where the frame 110 and the optical member 120 contact each other.

Since a lot of heat is generated when the LED 131 of the light irradiation unit 130 emits light, the frame 110 is generally made of a black aluminum material to effectively absorb and discharge the heat generated by the LED 131. . However, since the light emitted from the LED 131 is partially absorbed by the frame 110, the amount of light is reduced in a portion where the frame 110 and the optical member 120 contact each other. However, when the frame 110 is made of a light-based material that reflects light well, the surrounding light may be reflected from the outer surface of the frame 110 to penetrate the CCD camera 160 and interfere with inspection. . That is, since the light of the surroundings other than the light that is intentionally irradiated only to the necessary portion (object 170) during the inspection process does not penetrate the CCD camera 160, the frame 110 does not reflect the ambient light well. It is desirable to manufacture a dark material.

 Therefore, as illustrated in FIG. 7, the frame 110 is manufactured in black, but the upper part of the optical member 120 and the cover frame 112 are in contact with each other, and the lower part of the optical member 120 and the body frame 111 are in contact with each other. When the white tape 150 is attached to the light source, the light generated by the LED 131 is not absorbed by the main body frame 111 and the cover frame 112, but is reflected by the white tape 150 to be incident on the floodlight plate 121. You can do that. In addition, since the light generated from the LED 131 may be absorbed by the PCB guide 140 and the amount of light may be reduced, the PCB guide 140 is also made of a white material, so that the light generated from the LED 131 is the PCB guide 140. It is preferable not to be absorbed by the light beams, but to be reflected to the light transmitting plate 121 side.

Therefore, in the inspection lighting apparatus according to another embodiment of the present invention, the reduction in the amount of light in the contact portion of the optical member 120 and the frame 110 reduces the phenomenon of uniform light in all areas of the optical member 120 This can be investigated.

Preferred embodiments of the present invention described above are disclosed for the purpose of illustration, and those skilled in the art will be able to make various modifications, changes and additions within the spirit and scope of the present invention. And additions should be considered to be within the scope of the claims of the present invention.

100: inspection lighting device
110: frame
111: body frame
111a: opening a
111b: Guide protrusion
111c: PCB Groove
111d: Guide seating groove
112: cover frame
112a: opening part b
120: optical member
121: floodlight
122: reflection dot
122a: reflective layer
122b: barrier layer
123: first anti-reflection plate
124: second anti-reflection plate
125: silicon
130: light irradiation unit
131: LED
132: PCB
133: cable
140: PCB guide
141: fitting groove
150: white tape
160: CCD camera
170: object

Claims (4)

Attached in a state spaced apart from the transparent plate by a transparent plate provided with a plurality of reflective dots on the upper surface to reflect the light incident to the side downward and the adhesive material applied along the circumference of the lower surface of the transparent plate An optical member including a first anti-reflection plate;
A light irradiation part for irradiating light from the side of the floodlight plate; And
An inspection lighting apparatus, comprising: a frame supporting the optical member and the light irradiating part, the upper and lower inner sides of which are opened;
Attached in a state spaced apart from the transparent plate by a transparent plate provided with a plurality of reflective dots on the upper surface to reflect the light incident to the side downward and the adhesive material applied along the circumference of the lower surface of the transparent plate It includes a first anti-reflection plate, wherein the first anti-reflection plate is an AR coated transparent acrylic plate, the adhesive material along the circumference in the state spaced apart by a predetermined interval facing the translucent plate and the first anti-reflection plate An optical member having improved durability, wherein the silicon is coated and adhered to each other;
A light irradiation part for irradiating light from the side of the floodlight plate; And
An inspection lighting apparatus, comprising: a frame supporting the optical member and the light irradiating part, the upper and lower inner sides of which are opened;
In a state spaced apart from the floodlight plate by a transparent plate provided with a plurality of reflective dots on the upper surface to reflect the light incident to the side downward and the adhesive material applied along the circumference of the lower surface of the floodlight plate An optical member including a first anti-reflection plate to be attached and a second anti-reflection plate attached to the light transmissive plate at a predetermined interval apart by an adhesive material applied along a circumference of the upper surface of the light transmissive plate;
A light irradiation part for irradiating light from the side of the floodlight plate; And
A frame supporting the optical member and the light irradiation part, the upper and lower inner sides of which are opened; Inspection lighting device comprising a.
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