KR101922215B1 - Lighting device for line-scan inspection instrument - Google Patents

Abstract

The present invention relates to a lighting apparatus for a line scan inspection apparatus. The illumination device includes: a housing assembly having upper and lower slits for vertically incident and exiting reflected light; A plurality of light sources provided symmetrically around the vertical reflection light path in the housing assembly; And a light guide provided in the housing assembly, wherein the vertical reflection light path corresponds to a vertical extension of the lower slit and the upper slit, and the light guide path is formed so as to converge to a lower side of the vertical reflection light path . According to such a lighting device, it is advantageous to induce vertical irradiation close to the FOV region of the subject even in a short operating distance between the line scan camera and the subject, and at the same time, the light amount loss can be minimized, The durability and performance of the lighting apparatus can be assured even if a high-brightness light emitting element which is advantageous in realizing high resolution due to excellent heat dissipation performance is adopted.

Description

[0001] LIGHTING DEVICE FOR LINE-SCAN INSPECTION INSTRUMENT [0002]

The present invention relates to a lighting apparatus for a line scan inspection apparatus.

In general, a line scan inspection device used for inspecting a defective product in a production line includes a line scan camera and an illumination device having a built-in lens and an image sensor, and a predetermined working distance And the subject to be inspected is placed.

In such a line scan inspection apparatus, the image pickup of the object surface is performed while relatively moving the line scan camera or the object while illuminating the FOV (field of view) area of the object surface with the illumination device, And the light irradiated to the surface of the subject is reflected and picked up by the line scan camera.

On the other hand, in order to capture a high-resolution clear image at a high speed using a line scan inspection apparatus, the amount of vertical reflected light collected by the camera must be large. In order to increase the light amount of the vertically reflected light, it is necessary to i) increase the absolute amount of irradiation light from the illumination device, or ii) place the illumination device at a position close to the vertical irradiation direction.

In the case of the former i), another problem of heat dissipation and high energy consumption for the light emitting device is involved. In the latter case, in order to realize a high resolution, the operation distance is shortened, It is difficult to arrange the apparatus close to the vertical irradiation direction. Especially in the case of the latter ii), since the vertical irradiation by the illumination device is difficult, there is a loss of light quantity of reflected light. Therefore, in order to compensate for this, a special expensive camera such as a TDI camera capable of capturing a high- to be.

It is an object of the present invention to provide a line scan inspection apparatus which is advantageous for inducing vertical irradiation close to the FOV region of a subject even when the operation distance between the line scan camera and the subject is short and minimizes the amount of light loss, And to provide a lighting device for a vehicle.

The inventors of the present invention have found that, in a process of researching and developing a lighting apparatus for a line scan inspection apparatus having a new structure related to the above-mentioned problem, the present invention provides a lighting apparatus capable of placing a slit for incidence and emission of vertical reflected light, And at least one light source is installed around the optical path of the vertically reflected light inside the housing assembly formed with the slit at the top and the bottom and converges the light guide for irradiated light from each of the light sources toward the bottom of the vertical reflected light path The angle of tilt of the light guide can be easily adjusted so that it is possible to perform irradiation close to the vertical irradiation and to minimize the light amount loss. Further, it has been found that, by forming such a light guide in the housing assembly, it is possible to enhance the heat radiation performance for the light source by utilizing the sealed space inside the housing assembly as the forced cooling space using the liquid fluid. The present invention has been reached by further refining the design. The gist of the present invention based on recognition and attention to the above-mentioned problem is as follows.

(1) a housing assembly having upper and lower slits for incidence and emission of vertically reflected light; A plurality of light sources provided symmetrically around the vertical reflection light path in the housing assembly; And a light guide provided in the housing assembly, wherein the vertical reflection light path corresponds to a vertical extension of the lower slit and the upper slit, and the light guide path is formed so as to converge to a lower side of the vertical reflection light path Characterized in that the lighting device for a line scan inspection device is characterized in that it comprises:

(2) The housing assembly includes an upper case having the upper slit and a lower end opened; And a lower case having the lower slit and coupled to a lower end of the upper case, wherein a vertical extension line of the lower slit and the upper slit is formed to correspond to the vertical reflected light path. ) For line scan inspection equipment.

(3) an extension portion extending downward from the upper slit, wherein the lower case is provided with an incision groove portion in which the extension portion is accommodated and converged to the lower slit, Wherein a space is formed in the light guide passage.

(4) The illuminating device for a line scan inspection apparatus according to (3), wherein an outer surface of the extended portion and an inner surface of the incision groove portion are mirror-finished.

(5) The apparatus of claim 1, further comprising a partition plate for vertically partitioning the inside of the housing assembly and mounting the plurality of light sources, wherein the partition plate includes a cutout portion through which the extension portion is inserted; And the plurality of light sources are mounted on each of the plurality of side walls. The apparatus according to claim 1, wherein the plurality of light sources are mounted on each of the plurality of side walls, For example.

(6) The illuminating device for a line scan inspection apparatus according to (5), wherein the sag surface is formed to face the light guide.

(7) An upper space inside the housing assembly partitioned by the partition plate is provided as a refrigerant storage space, and the upper case is connected to the storage space to form an inlet and an outlet of the refrigerant. ) For line scan inspection equipment.

(8) The illumination device for a line scan inspection apparatus according to any one of (1) to (7), further comprising a diffusion filter which is mounted under the lower slit.

(9) The lighting apparatus for a line scan inspection apparatus according to any one of (1) to (7), further comprising a pair of throttle plates mounted on the lower side of the lower slit.

(10) The lighting apparatus for a line scan inspection apparatus according to (9), wherein the side surface of the throttle plate provided opposite to the lower slit is provided as an inclined surface inclined downward outward.

According to the illumination apparatus for a line scan inspection apparatus of the present invention, it is advantageous to induce vertical irradiation close to the FOV region of the subject even in a short operating distance between the line scan camera and the subject, and at the same time, A high-resolution image can be realized even when a light-emitting element having a general low brightness is adopted. Further, according to the lighting apparatus for a line scan testing apparatus, durability and performance of the lighting apparatus can be assured even when a high luminance luminous element which is excellent in heat radiation performance and is advantageous for realizing high resolution is adopted.

1 is a perspective view of a lighting apparatus for a line scan inspection apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view, a side view, and a bottom view of the lighting apparatus according to FIG. 1; FIG.
3 is an exploded perspective view of the illumination device according to FIG.
Fig. 4 is a cross-sectional structural view of the illumination device according to Fig. 1; Fig.
5 is a connection structure diagram of the illumination device and the line scan camera of FIG. 1;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or similar reference numerals are given to the same or similar parts. Also, when an element is referred to as " including " an element throughout the specification, it does not exclude other elements unless specifically stated to the contrary. It is to be understood that the present invention may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. . Further, the drawings for the parts that do not constitute the gist of the present invention are omitted or the description of the use or operation contents of the unit or apparatus according to the present invention will be omitted.

1 is a perspective view of a lighting apparatus 10 (hereinafter abbreviated as 'lighting apparatus') for a line scan testing apparatus according to an embodiment of the present invention, FIG. 2 is a plan view, a side view and a bottom view of the lighting apparatus 10 FIG. 3 is an exploded perspective view of the illuminating device 10, FIG. 4 is a sectional view of the illuminating device 10, and FIG. 5 is a connecting structure diagram of the illuminating device 10 and the line scan camera 20, respectively.

5, the illumination device 10 according to the present invention is disposed directly below the line scan camera 20 and is mounted integrally with the line scan camera 20, as in the embodiment, by a mounting bracket 40 And the assemblies of the illuminating device 10 and the line scan camera 20 and the subject 30 are relatively moved in the horizontal direction by the moving means not shown in the drawing. The line scan camera 20 is also provided with an image sensor and a light control element such as a lens not shown in the figure.

In this case, the center of the line scan camera 20 and the center of the illumination device 10 are orthogonal to each other, and a center-to-center connection line forms a vertical reflected light path C. The vertical reflected light path C corresponds to the upward and downward extension lines between the upper slit 114 and the lower slit 124 of the illumination apparatus 10 as described later. The light emitted from the plurality of light sources 200 (200a, 200b) provided in the periphery of the vertical reflected light path C in the lighting apparatus 10 is reflected according to the surface irregularities or profiles of the subject 30, And sequentially passes through the lower slit 124 and the upper slit 114 along the line C to arrive at the line scan camera 20.

1 to 4, the illumination device 10 includes a housing assembly 100; A plurality of light sources (200; 200a, 200b) provided inside the housing assembly (100); And a light guide path L (La, Lb) provided inside the housing assembly 100 for guiding light irradiated from the plurality of light sources 200 (200a, 200b) to the subject 30. In this case, the light guide paths L (La and Lb) are provided so as to converge to the lower side of the vertical reflected light path C.

The housing assembly 100 is provided with a lower slit 124 and an upper slit 114 for vertically reflected light to enter and exit the upper and lower slits 124, Corresponds to the vertical reflected light path C. Accordingly, as shown in FIG. 5, it is possible to arrange the illumination device 10 in a position directly under the line scan camera 20 in a state where the center of the illumination device 10 is vertically distributed to the center of the line scan camera 20.

The housing assembly 100 includes a dome-shaped upper case 110 having a lower open end and a lower case 120 having a generally plate shape. The lower case 120 has a bolt Respectively. The upper case 110 is provided with an upper slit 114 having a longer diameter and the lower case 120 is also provided with a lower slit 124 having a longer diameter. The centers of the upper slit 114 and the lower slit 124 are aligned to correspond to the vertical reflected light path C in a state where the upper case 110 and the lower case 120 are coupled to the housing assembly 100.

A support rib 126 is formed on an upper surface of the lower case 120 so as to be in close contact with a lower surface of a partition plate 300 which will be described later and a part of the support rib 126 is broken into a wiring groove 128. The supporting ribs 126 of the lower case 120 serve to secure a mounting space for the light sources 200 (200a, 200b) by forming a predetermined space between the supporting ribs 126 of the lower case 120 and the lower surface of the partition plate 300 described later.

The light guiding paths L and La may be realized by designing the structure and shape of the upper case 110 and the lower case 120 according to the embodiment without a separate component element. Specifically. The upper case 110 is provided with the extension 112 and the lower case 120 is provided with the cutout groove 122. The upper case 110 and the lower case 120 are coupled to the housing assembly 100, And the outer surface of the lower end of the extension 112 is tapered into a tapered inclined surface 112a converging toward the vertical reflected light path C, La and Lb are formed without the separate component elements in the housing assembly 100 by constituting each of the light guide grooves 122 and the incision grooves 122 with the inclined surfaces 122a converging toward the vertical reflected light path C, It is possible.

With this configuration, a predetermined space is formed between the outer surface of the extension 112 and the inner surface of the cutout groove 122, and the light path L (La, Lb ). The outer inclined surface 112a of the extension portion 112 and the inclined inner surface 122a of the cutout groove portion 122 constitute inner wall surfaces of the light guide paths L and La and Lb from the light sources 200a and 200b The irradiated light is guided toward the subject 30 while being reflected on the inner wall surface of the light guide passage L (La, Lb). The outer inclined surface 112a of the extension 112 forming the inner wall surface of the light guide passage L (La) and the inner inclined surface 122a of the cutout groove 122 are mirror-finished .

In the present invention, the inclination angle of the light guide paths L (La, Lb) with respect to the vertical reflected light path C is set such that the outer surface of the extended portion 112 and the inner surface of the cut- Can be easily adjusted through the inclination angle. In this case, as the inclination angle of the light guide paths L (La, Lb) with respect to the vertical reflected light path C becomes smaller, It is advantageous to induce vertically close proximity to the FOV area of the subject even in a short state, and at the same time, the light amount loss can be minimized, so that a high resolution image can be realized even when a light emitting device of general low brightness is employed.

Alternatively, the illumination device 10 may further include a partition plate 300 partitioning the interior of the housing assembly 100 up and down and mounting the plurality of light sources 200a and 200b. A cutout 304 is provided at the center of the partition plate 300 and a plurality of sidewalls 310 formed on both sides of the cutout 304 on both sides thereof. In the illustrated embodiment, the two slat surfaces 310 are provided symmetrically with respect to the slit 304. Support ribs 306a and 306b extending upward are formed at the periphery of the peripheral edge of the partition plate 300 and the cutout 304. [ The upper ends of the support ribs 306a and 306b are in close contact with the inner lower surface of the upper case 110 so that the upper surface of the upper case 110 and the upper surface of the partition plate 300 have a predetermined space S Is formed. This space is utilized as a refrigerant storage space S as will be described later.

The cutout portion 304 serves as a penetration of the extension portion 112 of the upper case 110 so that the extension portion 112 of the upper case 110 is inserted into the lower case 120 As shown in Fig. In this case, the outer diameter of the extension 112 is aligned with the inner diameter of the cutout 122, so that the upper space of the housing assembly 100 is located on the inner side of the upper case 110, And a closed space S formed by the sides of the ribs 306a and 306b.

The upper enclosed space S in the housing assembly 100 is used as a forced cooling space using a liquid fluid so that a high luminance light emitting device emitting a large amount of heat when emitting light such as a power LED to the light source 200 210), it is possible to dissipate heat quickly and smoothly. Accordingly, problems such as damage to the high-luminance light emitting device 210 due to delayed heat radiation or deterioration in luminance performance can be prevented during the operation, and the durability and performance of the lighting device 10 can be ensured, It is possible to adopt the element 210, which is also advantageous for high resolution image pickup. In order to utilize the upper closed space S in the housing assembly 100 as a refrigerant storage space, the upper case 110 has an inlet and an outlet for refrigerant communicated with the storage space S, And a refrigerant pipe 700 (700a, 700b) connected to a refrigerant circulation pump (not shown) is coupled.

The chamfered surface 310 provides a mounting position for each of the plurality of light sources 200 (200a, 200b). Each of the plurality of light sources 200 (200a, 200b) may be coupled to each of the plurality of the sidewalls 310 by using a bolt or an adhesive (not shown). Each of the plurality of light sources 200 (200a, 200b) may be provided in a form in which a light emitting device 210 such as an LED is mounted on the circuit board 220. A wiring groove 230 for wiring a power supply line (not shown) is provided on a side surface of the circuit board 220. The wiring grooves 230 of the circuit board are formed corresponding to the wiring grooves 128 formed in the support ribs 126 of the lower case 120. [ The power supply line is sequentially passed through the hole formed in the wiring groove 230 of the circuit board and the wiring groove 128 of the lower case and the wiring hole 115 provided in the upper case 110, Lt; / RTI >

Alternatively, it is preferable that the haze surface 310 is formed so as to face toward the light guide passage L (La, Lb), thereby minimizing the loss of the amount of light irradiated from the light emitting device 210. In this case, the downward inclination angle of the side wall 310 varies depending on the inclination angle of the light guide paths L, La and Lb with respect to the vertically reflected light path C.

The illumination device 10 may further include a diffusion filter 400 mounted on a lower side of the lower slit 124. The diffusion filter 400 serves to diffuse the light passing through the lower slit 124, thereby irradiating the object 30 with uniform light. In the embodiment, the diffusion filters 400 are configured as a pair, and the diffusion filters 400 are mounted to be spaced apart from each other by a width of a lower slit 124 or a smaller size.

In addition, the illumination device 10 may further include a control panel 500 (500a, 500b) mounted on the lower side of the lower slit 124. The control panel 500 (500a, 500b) is provided on both sides of the lower slit 124 as a reference, and the pair of control panels 500 (500a, 500b) Area.

In this case, in order to more effectively guide the irradiation light by the adjusting plate 500 (500a, 500b), the side surface of the throttling plate which is opposed to the lower slit 124 is provided with an inclined surface 502 inclined downward outward . This is because the light guiding path L (La, Lb) has a predetermined inclination angle with the vertical reflected light path C, so that the irradiation light passing through the lower slit 124 is prevented from deviating out of the FOV region and guided to the inside . The inclined surface 502 of the adjusting plate 500 (500a, 500b) is formed so as to minimize the light loss upon reflection, as in the outer inclined surface 112a of the extending portion 112 and the inner inclined surface 122a of the cutout trench 122 It is preferable to be mirror-finished.

The spacing distance of the pair of throttle plates 500 (500a, 500b) needs to be adjusted according to the size of the FOV area. To this end, each pair of throttle plates 500, 500a, 500b has a long hole 504, ) Of the first and second plates. When the diffusion filter 400 is provided as in the embodiment, the pair of the control plates 500a and 500b may be provided below the diffusion filter 400 and the diffusion filter 400 may be provided on the lower case 120 The pair of throttle plates 500a and 500b are bolted to the lower surface of the lower case 120 so that the diffusion filter 400 is completely shielded from the outside.

As described above, according to the lighting apparatus 10 of the present invention, it is advantageous to induce vertical irradiation close to the FOV region of the subject even when the working distance between the line scan camera 20 and the subject 30 is short, It is possible to realize a high-resolution image even in the case of adopting a general low-luminance light-emitting element of the related art. According to the lighting device 10, durability and performance of the lighting device 10 can be assured even when a high-luminance light-emitting device having excellent heat dissipation performance and being advantageous for realizing a high resolution is adopted.

The foregoing is a description of specific embodiments of the present invention. While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments or constructions. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It should be understood that this is possible.

For example, in the embodiment, the illumination device 10 is coupled to the line scan camera 20 by the mounting bracket 40 to behave as a single body. However, depending on the use environment, 20).

In addition, in the embodiment, in order to simplify the device and the component elements, the formation of the light guide passage L (L) of the light guide (L) is realized through the structure and shape design for the upper case 110 and the lower case 120 However, it is also possible to implement the present invention through a separate component element accommodated in the housing assembly 100, such as the partition plate 300. [

In the embodiment, the upper slit 114 and the lower slit 124 are assumed to have a non-square long-diameter structure, and the light source 200 (200a, 200b), the stage 310 for mounting the light source 200, La and Lb are respectively provided on both sides of the long slit 114 and the long slit 124. However, when the upper slit 114 and the lower slit 124 are provided in a square structure, The number of the light sources 200 and the light guide paths L may be designed to be provided in plural around the vertical reflected light path.

It is therefore to be understood that all such modifications and alterations are intended to fall within the scope of the invention as disclosed in the following claims or their equivalents.

10: Lights for line scan test equipment
100: housing assembly
110: upper case
112: extension part 112a: inclined surface
114: upper slit 115: wiring hole
116a and 116b:
120: Lower case
122: incision groove portion 122a: inclined surface
124: Lower slit
126: Support rib
128: wiring groove
200, 200a, 200b: Light source
210: light emitting device 220: circuit board
230: wiring groove
300: partition plate
304: incision
306a, 306b:
310: Head side
400: diffusion filter
500, 500a, 500b: throttle
502: slope surface 504: long diameter hole
600, 600a, 600b: gasket
700, 700a, 700b: refrigerant pipe
L, La, Lb: light guide furnace S: refrigerant storage space
C: vertical reflection light path
20: Line scan camera 30: Subject
40: Mounting bracket

Claims (10)

A housing assembly having upper and lower slits for incidence and emission of vertically reflected light; A plurality of light sources provided symmetrically around the vertical reflection light path in the housing assembly; And a light guide provided inside the housing assembly,
The housing assembly includes an upper case having the upper slit and a lower end opened; And a lower case having the lower slit and coupled to a lower end of the upper case, wherein a vertically extending line of the lower slit and the upper slit is formed to correspond to the vertical reflected light path,
Wherein the lower case includes a cutout groove portion accommodating the extension portion and converging to the lower slit, wherein a space between the outer surface of the extended portion and the inner surface of the cutout groove portion is formed in the lower slit, And a tapered inclined surface which is formed by a light guide and which converges the outer surface of the extended portion and the inner surface of the cutout groove portion facing each other toward the vertically reflected light path side,
Lights for line scan test equipment. delete delete The illumination device for a line scan inspection apparatus according to claim 1, wherein the outer surface of the extension portion and the inner surface of the cut-out groove portion are mirror-finished. [2] The apparatus of claim 1, further comprising: a partition plate for vertically partitioning the inside of the housing assembly and mounting the plurality of light sources, wherein the partition plate comprises: a cutout portion through which the extension portion is inserted; And a plurality of sidewalls formed symmetrically with respect to the cut-away portion, wherein each of the plurality of light sources is mounted on each of the plurality of the sidewalls. The illumination device for a line scan inspection apparatus according to claim 5, wherein the sag surface is formed to face the light guide. The refrigerator according to claim 5, wherein the upper space inside the housing assembly defined by the partition plate is provided as a refrigerant storage space, and the upper case is connected to the storage space to form an inlet and an outlet of the refrigerant. Lights for line scan test equipment. The illuminating device for a line scan inspection apparatus according to any one of claims 1 to 7, further comprising a diffusion filter mounted under the lower slit. The apparatus according to any one of claims 1 to 7, further comprising a pair of throttle plates mounted below the lower slit for shielding a part of the irradiated light and concentrating the irradiated light in the FOV area, Wherein each of the pair of the throttle plates has a long diameter hole and is bolted to the lower case to adjust a spacing distance therebetween. The apparatus of claim 9, wherein the side of the throttling plate, which is opposed to the lower slit, is provided as an inclined surface inclined downward outward.

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