KR20090002368A - Polarizing film inspecting apparatus of multi-step type - Google Patents

Abstract

A polarizing film inspecting apparatus of multi-step type is provided to prevent the middle part of polarizing film from being deflected or TAC(Tri-Acetyl-Cellulose) from being broken. A polarizing film inspecting apparatus of multi-step type comprises a first transfer stage(210) where a plurality of absorption plate absorbing polarizing film is mounted at regular interval; a first scan part(200) including a first optical unit(224) arranged on the reciprocating range of the first transfer stage in order to photograph the unabsorbed part of the polarizing film; a lift part(400) having a vertical transfer plate receiving the polarizing film passed through the first scan part; and a second scam part(300) having a second optical unit(324) arranged on the reciprocating range of the second transfer stage in order to photograph the unabsorbed part.

Description

POLARIZING FILM INSPECTING APPARATUS OF MULTI-STEP TYPE}

1 is a perspective view showing a multi-stage polarizing film inspection apparatus according to the present invention,

FIG. 2 is an exploded perspective view of the first scan unit illustrated in FIG. 1;

3 is an exploded perspective view of the second scan unit illustrated in FIG. 1, and

4 is an exploded perspective view of the lift unit illustrated in FIG. 1.

Explanation of symbols on the main parts of the drawing

100: multi-level polarizing film inspection apparatus 200: first scanning unit

210: first transfer stage 220: first adsorption plate

224: first optical means 230: first horizontal transfer means

300: second scanning unit 310: second transfer stage

320: second adsorption plate 324: second optical means

330: second horizontal transfer means 400: the lift unit

410: vertical transfer plate 420: vertical transfer means

The present invention relates to a multi-stage polarizing film inspection apparatus, and more particularly, by adsorptively transferring a polarizing film to be inspected using a transfer stage having an adsorption plate, thereby preventing breakage, sagging and deformation of the polarizing film during inspection. In addition, the present invention relates to a multi-stage polarizing film inspection apparatus capable of increasing the product value of the polarizing film by not leaving a trace clamped on the polarizing film.

In general, liquid crystal displays (LCDs) use birefringence of liquid crystals, and thus polarizing films are used to control vibration directions of light incident on liquid crystal molecules. Such a polarizing film has a function of making polarized light vibrating in only one direction while vibrating in various directions. Examples of the polarizing film include iodine-based, dye-based, retardation, semi-transmissive and reflective type. have. Iodine polarizing film is a polarizing film for high-definition LCD having high transmittance and high polarization characteristics, so that iodine is applied to a transparent polyvinyl alcohol (PVA) film to absorb light in the visible region.

As anyone can see, a polarizing film is composed of a TAC (Tri-Acetyl-Cellulose) film, an adhesive, a polarizing element, an adhesive, and a TAC film sequentially stacked. Such a polarizing film may generate a fine scratch in the manufacturing process, and also may cause a slight deformation or damage to the PVA film. Such a deformation of the scratch or PVA film has a problem of making a stain on the screen when driving the LCD screen.

As a method of inspecting the scratch of the polarizing film or deformation of the PVA film and the like, the method of performing the naked eye by the operator was mainly used, but there was a problem that the precision of the inspection differed according to the skill of the operator.

In order to solve the above problems, recently, inspection devices for clamping a polarizing film on a transfer table and inspecting the same through a camera have been developed and marketed. These inspection devices require the camera to see the flat plane of the polarization film in the area where the camera inspects the polarizing film. Therefore, by using a mechanical method such as a cylinder, the four edges of the polarizing film are clamped to be as flat as possible. The camera works by scanning this section.

However, since four corners of the polarizing film are clamped in a mechanical manner, the TAC constituting the polarizing film is broken, or the adhesive is squeezed out.

In addition, even if the four edges of the polarizing film clamped with a strong force, there was a problem that the central portion of the polarizing film sag due to its own weight. This deflection phenomenon causes a shaking phenomenon due to resistance with air when the polarizing film is transferred at a constant speed, thereby preventing smooth inspection.

In addition, the mechanical clamping force applied to the four corners to convey the polarizing film has a problem of lowering the product value of the polarizing film because it leaves a clamping trace on the polarizing film.

The present invention has been made to solve the conventional problems as described above, an object of the present invention by adsorption transfer of the polarizing film to be inspected by using a transfer stage having a vacuum adsorption plate, breakage of the polarizing film during inspection, The present invention provides a multi-stage polarizing film inspection apparatus that can prevent sag and deformation and also increase the product value of the polarizing film without leaving a trace of clamping on the polarizing film.

In order to achieve the object of the present invention as described above, the present invention,

The first transfer stage mounted with a plurality of first adsorption plates at regular intervals to adsorb and support the polarizing film, and the reciprocating section of the first transfer stage to photograph the portion not adsorbed and supported on the first transfer stage. A first scanning unit having a first optical means arranged;

A lift unit having a vertical transfer plate which receives the polarizing film passing through the first scan unit; And

A second transfer stage equipped with a plurality of second adsorption plates and a portion not adsorbed and supported by the second transfer stage may be photographed so as to support the portion photographed by the first scan unit while the polarizing film is transferred from the lift unit. It provides a multi-stage polarizing film inspection apparatus consisting of a second scanning unit having a second optical means disposed in the reciprocating section of the second transfer stage.

As described above, according to the present invention, by adsorbing and transporting the polarizing film to be inspected by using a transfer stage having a vacuum adsorption plate, it is possible to prevent breakage, sagging and deformation of the polarizing film during the inspection, as well as polarization. The product value of the polarizing film can be increased by not leaving a trace of clamping on the film.

Hereinafter, a multi-stage polarizing film inspection apparatus according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view illustrating a multi-stage polarizing film inspection apparatus according to the present invention, FIG. 2 is an exploded perspective view of the first scan unit illustrated in FIG. 1, and FIG. 3 is an exploded perspective view of the second scan unit illustrated in FIG. 1. to be.

1 to 3, the multi-stage polarizing film inspection apparatus 100 according to the present invention includes a first scan unit 200 and a second scan unit disposed at an end of the first scan unit 200 ( 300 and a lift unit 400 disposed between the first scan unit 200 and the second scan unit 300.

First, the first scan unit 200 and the second scan unit 300 and the first transfer stage 210 and the second transfer stage 310 to reciprocate while supporting the polarizing film (P) which is the inspection object First photographing the polarizing film (P) is disposed in the reciprocating section of the first transfer stage 210 and the second transfer stage 310 adsorbed to the first transfer stage 210 and the second transfer stage 310 An optical means 224 and a second optical means 324. As anyone can see, the first optical means 224 and the second optical means 324 are cameras 226 and 326 for photographing the surface image of the polarizing film P, and illumination for adjusting the image magnification and forming an image. Devices 228 and 328.

The first transfer stage 210 and the second transfer stage 310 have a rectangular ring shape arranged horizontally. To this end, the first frame 212 and 312 and the second frame 214 and 314 and the first frame which are spaced apart from each other and extend along the conveying direction of the first transfer stage 210 and the second transfer stage 310, And third frames 216 and 316 and fourth frames 218 and 318 connecting both ends 212 and 312 and second frames 214 and 314.

In addition, the first transfer stage 210 and the second transfer stage 310 is provided with a plurality of first adsorption plate 220 and a plurality of second adsorption plate 320 for vacuum adsorption of the polarizing film (P). In addition, the plurality of first adsorption plates 220 and the plurality of second adsorption plates 320 are connected to third and fourth frames 216 and 316 and fourth frames 218 and 318 that one end and the other end face each other. In this case, the plurality of first adsorption plates 220 are mounted while maintaining a constant interval, and the plurality of second adsorption plates 320 are mounted to face the gap formed by the first adsorption plates 220. That is, the camera 226 of the first optical means 224 and the camera 326 of the second optical means 324 are formed by the first adsorption plate 220 and the second adsorption plate 320. Shoot the video.

Preferably, as will be appreciated by anyone, a plurality of vacuum adsorption holes 222 and 322 are formed in the first adsorption plate 220 and the second adsorption plate 320, and the first adsorption plate 220 and the second adsorption plate ( A vacuum fitting (not shown) connected to each of the vacuum suction holes 222 and 322 is connected to the lower portion of the 320.

On the other hand, adjacent to the first frame 212 of the first transfer stage 210 is provided with a conventional first horizontal transfer means 230 for transferring the first transfer stage 210, and the second transfer stage ( Adjacent to the second frame 314 of 310 is provided with a second normal horizontal transfer means 330 for transferring the second transfer stage (310). A first connecting bracket 232 connected to the first horizontal transfer means 230 is formed in the first frame 212 of the first transfer stage 210. Similarly, the second frame of the second transfer stage 310 is formed. A second connection bracket 332 is formed at 314 to be connected to the second horizontal transfer means 330.

Preferably, the second auxiliary LM guide 250 extending along the first horizontal conveying means 230 at the lower side of the second frame 214 of the first conveying stage 210 to the second horizontal conveying means 330. The first auxiliary EL block 252, which is disposed without interference and is guided along the first auxiliary EL guide 250, is integrally mounted to the lower portion of the second frame 214 of the first transfer stage 210. In addition, the second auxiliary LM guide 350 extending along the second horizontal conveying means 330 does not interfere with the first horizontal conveying means 230 at the lower side of the first frame 214 of the second conveying stage 310. The second auxiliary EL block 352, which is not disposed and guides along the second auxiliary LG guide 350, is integrally mounted to the lower portion of the first frame 312 of the second transfer stage 310.

The lift unit 400 is disposed between the first scan unit 200 and the second scan unit 300 formed as described above.

4 is an exploded perspective view of the lift unit illustrated in FIG. 1.

1 and 4, the leaf part 400 receives the polarizing film P from the first scan part 200 and guides the polarizing film P back to the second scan part 300.

The leaf part 400 includes a vertical transfer plate 410 vertically and vertically transferred. On the lower surface of the vertical transfer plate 410, a plurality of vacuum pads 412 are mounted to absorb the polarizing film P passing through the first scan unit 200. As anyone can see, each vacuum pad 412 is connected to a vacuum fitting (not shown). On the other hand, the vertical transfer plate 410 is disposed adjacent to the vertical vertical transfer means 420 to vertically transfer the vertical transfer plate 410, vertical transfer means 420 and the vertical transfer means 420 The third connection bracket 422 is mounted.

On the other hand, the vertical transfer means 420, the first horizontal transfer means 230 and the second horizontal transfer means 330 has the same shape and the same configuration. The first horizontal conveying means 230, the second horizontal conveying means 330, and the vertical conveying means 420 cover the bases 234, 334, and 424 and the covers 236, 336 of the bases 234, 334, and 424. , 426, first pulleys 238, 338, 428 and second pulleys 240, 340, 430 rotatably disposed at both ends of the bases 234, 334, 424, and first pulleys 238, Belts 242, 342, 432 rotatably spanning 338, 428 and second pulleys 240, 340, 430, and belts 240, 340, 430 fixedly mounted to the belts 240, 340, 430. A slider 244, which is conveyed along the inner side and is exposed to the outside of the covers 236, 336, and 426, is connected to the first connecting bracket 232, the second connecting bracket 332, and the third connecting bracket 422. 344, 434. On the other hand, as anyone can know, any one of the first pulley (238, 338, 428) or the second pulley (240, 340, 430) to the first pulley (238, 338, 428) or the second pulley (240, 340, Drive motors 246, 346 and 436 for rotating any one of the 430 is mounted.

Hereinafter, the operating state of the multi-stage polarizing film inspection apparatus 100 formed as described above will be briefly described.

When the polarizing film P, which is the inspection object, is placed on the first transfer stage 210 of the first scan unit 200, a vacuum pressure is supplied to the vacuum adsorption hole 222 of the first adsorption plate 220. In this way, a vacuum pressure is supplied to the first adsorption plate 220, and the polarizing film P is adsorbed and supported by the first adsorption plate 220.

Under this condition, when the first horizontal transfer means 230 is operated, the first transfer stage 210 is transferred to the lift unit 400, and the camera 226 is along the first horizontal transfer means 230. The surface image of the guided polarizing film (P) is taken. At this time, the camera 226 photographs the surface image of the portion not supported by the first adsorption plate 220.

When the polarizing film P is guided to the lift unit 400 through the first scan unit 200 as described above, the vertical transfer unit 420 lowers the vertical transfer plate 410 to the vertical transfer plate 410. The mounted vacuum pad 412 is in close contact with the polarizing film (P). When the vacuum pad 412 is in close contact with the polarizing film P, the vacuum pressure is supplied to the vacuum pad 412, the vacuum pressure is recovered to the first adsorption plate 220, and at the same time, the vertical transfer means 420 is applied. Operate to raise the vertical transfer plate 410.

When the vertical transfer plate 410 vacuum-adsorbs the polarizing film P, the second horizontal transfer means 330 operates to transfer the second transfer stage 310 to the lift unit 400. When the second transfer stage 310 is transferred to the lower portion of the lift unit 400, the vertical transfer means 420 lowers the vertical transfer plate 410 again to transfer the polarizing film P to the second transfer stage 310. Close contact When the polarizing film P is in close contact with the second adsorption plate 320, the vacuum pressure is supplied to the vacuum adsorption hole 322 of the second adsorption plate 320, and the vacuum pressure is recovered to the vacuum pad 412. At the same time by operating the vertical transfer means 420 to raise the vertical transfer plate 410 again.

As described above, when the polarizing film P is adsorbed and supported on the second adsorption plate 320, and the second horizontal transfer means 330 is operated, the second transfer stage 310 may perform the second horizontal transfer means ( Returned by the 330, the camera 326 is to take a surface image of the polarizing film (P) guided along the second horizontal transfer means (330). At this time, the camera 326 captures the surface image of the portion not supported by the second adsorption plate 320.

As a result, the camera 226 of the first optical means 224 photographs a portion of the polarizing film P adsorbed and supported by the first adsorption plate 220, which is not adsorbed by the first adsorption plate 220, and the second. The adsorption plate 320 is the camera 326 of the second optical means 324 is the second adsorption plate 320 in a state that the adsorption support of the portion photographed by the camera 226 of the first optical means 224 By photographing a portion not supported by adsorption, that is, a portion adsorbed and supported by the first adsorption plate 220, surface photographing of the entire area of the polarizing film P is possible.

As described above, the multi-stage polarizing film inspection apparatus 100 according to the present invention includes a first transfer stage 210 and a second transfer stage 310 that adsorb and support the polarization film P, which is an inspection object. In the process of clamping the polarizing film P as in the prior art, the TAC constituting the polarizing film P is broken or the adhesive is squeezed out, and the central part of the polarizing film P is sagging or transported. The vibration with the air can be prevented.

In addition, there is an advantage that the clamping traces are not left as the polarizing film P is vacuum-adsorbed.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims. You will understand.

Claims (8)

Reciprocating of the first transfer stage so as to photograph the first transfer stage and the plurality of first adsorption plate mounted while maintaining a constant interval so as to support the polarizing film and the portion not adsorbed and supported on the first transfer stage A first scanning unit having a first optical means disposed in the section; A lift unit having a vertical transfer plate for receiving the polarizing film passing through the first scan unit; And A second transfer stage equipped with a plurality of second adsorption plates so that the lift unit may support the portion photographed by the first scan unit while the polarizing film is transferred from the lift unit; A multi-stage polarizing film inspection apparatus comprising a second scanning unit having a second optical means disposed in the reciprocating section of the second transfer stage so as to photograph the portion. The method of claim 1, wherein the first transfer stage and the second transfer stage is extended in the conveying direction of the first transfer stage and the second transfer stage and the first frame and the second frame are spaced apart from each other, A third frame and a fourth frame connecting both ends of the first frame and the second frame, wherein one end and the other end of the plurality of first adsorption plates and the plurality of second adsorption plates face each other; Multi-stage polarizing film inspection apparatus characterized in that connected to the frame and the fourth frame. 3. The apparatus of claim 2, wherein the first scan unit further comprises a normal first horizontal transfer means for transferring the first transfer stage, the first scan unit being connected to the first horizontal transfer means on the first frame of the first transfer stage. The first connection bracket is integrally mounted, and the second scan unit further includes a second normal horizontal transfer means for transferring the second transfer stage, and the second frame is disposed on the second frame of the second transfer stage. A multi-stage polarizing film inspection apparatus, characterized in that the second connection bracket connected to the horizontal transfer means is integrally mounted. 4. The method of claim 3, wherein a first auxiliary LM guide extending along the first horizontal transfer means is disposed on the lower side of the second frame of the first transfer stage so as not to interfere with the second horizontal transfer means. A first auxiliary EL block guided along the first auxiliary EL guide is integrally mounted to the lower part of the second frame of the first transfer stage, and the second horizontal transfer is provided on the lower side of the first frame of the second transfer stage. A second auxiliary LM guide extending along the means is arranged so as not to interfere with the first horizontal transfer means, and a second auxiliary guide guided along the second auxiliary LM guide at the bottom of the first frame of the second transfer stage. Multi-level polarizing film inspection device, characterized in that the L block is integrally mounted. The multi-stage method according to claim 1, wherein the first optical means and the second optical means comprise a camera for photographing the surface image of the polarizing film, and an illumination device for scaling the image and forming an image. Polarizing film inspection device. According to claim 1, wherein the first suction plate and the second suction plate is formed with a plurality of vacuum suction holes, the lower portion of the first suction plate and the second suction plate is connected to the respective vacuum suction holes. Multi-level polarizing film inspection apparatus, characterized in that the vacuum fitting is connected. According to claim 1, The leaf portion further comprises a normal vertical transfer means for transferring the vertical transfer plate, a plurality of vacuum pads are mounted on the lower surface of the vertical transfer plate to adsorb the polarizing film, The vertical transfer plate is a multi-stage polarizing film inspection apparatus, characterized in that the third connection bracket is integrally mounted with the vertical transfer means. 8. The method of any one of claims 3 to 7, wherein the first horizontal transfer means, the second horizontal transfer means and the vertical transfer means have the same shape and the same configuration, and the first horizontal transfer means, The second horizontal conveying means and the vertical conveying means may include a base, a covering cover of the base, first and second pulleys rotatably disposed at both ends of the base, the first pulley and the second pulley. A belt that is rotatably spanned, a slider fixedly mounted to the belt, transported along the belt, and both ends of which are exposed to the outside of the cover to connect the first connecting bracket, the second connecting bracket, and the third connecting bracket. It is provided, wherein either one of the first pulley or the second pulley is a multi-stage polarizing film inspection apparatus characterized in that the drive motor is mounted.

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