CN1292246C - Lighting device for testing substrate - Google Patents
Lighting device for testing substrate Download PDFInfo
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- CN1292246C CN1292246C CN 03156997 CN03156997A CN1292246C CN 1292246 C CN1292246 C CN 1292246C CN 03156997 CN03156997 CN 03156997 CN 03156997 A CN03156997 A CN 03156997A CN 1292246 C CN1292246 C CN 1292246C
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- light
- substrate
- lighting device
- lens
- mirror
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Abstract
A lighting apparatus is provided to simplify the movement structure of the lighting apparatus by lighting the wide area of a substrate through the use of plural lightings. A lighting apparatus comprises a plurality of mirrors(130,140) for reflecting the light beams generated from a plurality of light sources(110,120); and first and second Fresnel lens(200,210) for focusing the diffused light beams reflected from each of the mirrors to a single focusing point, and radiating the focused light beams to a substrate(100) mounted on a stage. The light beams radiated to the substrate from the first Fresnel lens and the second Fresnel lens are partially overlapped.
Description
Technical field
The present invention relates to a kind of being used for is directed to a large-scale substrate so that with the naked eye check the lighting device of defective with light.
Background technology
Usually, carry out visual inspection, promptly with the naked eye check it is the defective that in the production of the substrate of semiconductor wafer or LCD (LCD), PDP (plasma display) or EL (EL sheet), on substrate, stays in the process in order to find, for example foreign matter or spot.In this case, in order to be easy to find defective, whole substrate shines equably with a lighting device, easily finds on-chip spot and defective by utilize the light that reflects on substrate.
A kind of lighting device that utilizes the light focusing of Fresnel lens of prior art guides (irradiation) by the Fresnel lens transmission to substrate, so that illuminate this substrate equably from the light of a light source and with light.
Especially, Japanese Unexamined Patent Publication No 2000-131226 discloses the method for the coating state of the liquid fluorescent material on a kind of rear surface that is used to check PDP.In this method, light is projected onto one and checks object surfaces, receives this surperficial reflected light, and the Strength Changes of measuring light, so that check this substrate.
Fig. 1 has shown the cut-open view of lighting device that is used to check substrate of prior art, and this device mainly comprises a microscope, and this microscope has object lens, a shank (lensbarrel) and an eyepiece.
Referring to Fig. 1, being used to of the prior art checks that the lighting device of substrate provides a mirror 12 that is used to reflect from the light of light source 11; A top Fresnel lens 13 that is used for the convergence of rays of dispersing in the reflection of mirror 12 places is become a branch of directional light; One is used to assemble directional light that passes this top Fresnel lens 13 and the bottom Fresnel lens 14 that light is shone the substrate 10 on platform 20; With a liquid crystal board 15 that is attached to this bottom Fresnel lens 14, this liquid crystal board can change transparent/opaque state according to the energy that applies into, so that produce direct light or scattered light.
This top Fresnel lens is as microscopical eyepiece, and this bottom Fresnel lens 14 is as microscopical object lens.And the spatial class between this top Fresnel lens 13 and the bottom Fresnel lens 14 is similar to as this microscopical shank.
At the lighting device that is used for checking substrate of prior art, dispersed basically by mirror 12 and reflected towards top Fresnel lens 13 from the light of light source 11.The scattered light that is reflected at mirror 12 is converged to directional light at top Fresnel lens 13, and light once more through overconvergence, and shines substrate 10 on the platform 20 at bottom Fresnel lens 14.
Like this, being radiated at equably under the help of on-chip light, just can find on-chip defective from a focus S.
Yet, for flat-panel monitor, for example LCD or PDP are along with screen size constantly increases and pixel size constantly reduces, produce impeccable product and become very difficult, and illuminating the task that whole substrate becomes those skilled in the art with direct light at the same time.
In other words, check in prior art under the situation of LCD substrate of height * wide=370mm * 470mm, shown in Fig. 2 A and 2B, whole substrate is illuminated under the situation of removable lighting not with a lighting device at one time, when sizes of substrate increases to height * wide=1100mm * 1250mm at large, by the method for prior art substrate is checked to become very difficult.
Usually because can be 400mm～500mm with the width range of the substrate of a lighting device inspection, so will by a left side/right side and on/following direction moves the whole surface that a lighting device is checked substrate, shown in Fig. 3 A and 3B; Or by moving the whole surface that two lighting devices are checked substrate, shown in Fig. 4 A and 4B in last/following direction.
In the method for using a lighting device inspection substrate, in order to increase the inspection precision, when in a left side/right or up/during following direction removable lighting, adjust incident angle, reflection angle, wavelength, intensity, scattering and the polarization direction of light, so that optimize the visual condition of checking object.
But being used to of prior art checks that the lighting device of substrate has following problem.
At first, referring to Fig. 3 A and 3B, should by in a left side/right or up/method that is used to check large size substrate of following direction removable lighting, at removable lighting during to a plurality of part of substrate, be inconvenient to check that reason is that this lighting device can only illuminate the limited portion of substrate.Owing to be not to check whole substrate simultaneously, but, need for a long time so check whole large size substrate, and precision be very poor according to the area piecemeal inspection that lighting device can illuminate.In addition, referring to Fig. 3 A, this method also has inconvenience, when operating personnel's focus changes to ' S ' from ' S ' ' time, operating personnel need also and then that focus moves so that check this substrate.
Second, referring to Fig. 4 A and 4B, though time and the space problem discussed for Fig. 3 A and 3B, use more than one lighting device be used to check that the method in large scale zone of substrate is respond well on precision, but be shown in the dark area of existence between two lighting devices that do not have irradiate light as Fig. 4 B, caused this dark area can not checked problem.
The 3rd, referring to Fig. 3 A and 3B and 4A and 4B, being used to of an above lighting device of this use checks that the method in the large scale zone of substrate needs operating personnel's focus to transfer to ' S ' according to the position of substrate from ' S ' ', wherein shown in Fig. 3 A and 3B, two lighting devices are controlled at the motion of a left side/right horizontal direction respectively, with shown in Fig. 4 A and 4B, lighting device is in last/following movement in vertical direction.
Summary of the invention
Correspondingly, the present invention relates to a kind of lighting device that is used to check substrate, it has solved on basically because one or more problems that the shortcoming of prior art and limitation cause.
An object of the present invention is to provide a kind of lighting device that is used to check substrate, this lighting device can be provided for checking the optimum visual condition on the surface of large size substrate.
Another object of the present invention provides a kind of lighting device that is used to check substrate, this lighting device can make operating personnel when checking the surface a focus, under the situation that does not change focus, check on-chip spot and defective.
Further purpose of the present invention provides a kind of lighting device that is used to check substrate, and this lighting device has increased the zone of the substrate surface that illuminates under the situation that does not reduce output, so that produce the high-quality substrate with height reliability.
Other characteristics of the present invention and advantage will be described in the explanation of back, and those of ordinary skills are by reading the following description or can partly understanding these characteristics and advantage by implementing the present invention.The structure that illustrates in the instructions that these purposes of the present invention and other advantages can be by the application, the application's protection domain and the accompanying drawing realizes and obtains.
In order to realize these purposes and other advantages, and according to purpose of the present invention, as introduce in the embodiment and institute general description here, of the present invention being used to checks that the lighting device of substrate comprises: a plurality ofly be used for reflecting respectively from the mirror of the light of a plurality of light sources and be used for from light focusing to a focus of this mirror and illuminate the lens of the substrate on platform.
Preferably, light focusing and that illuminate substrate is partly overlapping between adjacent ray.
Preferably, make light focusing to a focus by at least one mirror in the removable lighting and/or Fresnel lens, so that adjust incident angle or reflection angle from the light of a plurality of light sources, described lighting device comprises light source, mirror and Fresnel lens.
In another aspect of this invention, a kind of lighting device that is used to check substrate is provided, comprise: one be used for reflecting from one a left side, a curved surface upper edge/right side and/mirror of the light of the light source that at least one direction of following direction moves and one is used for from light focusing to a focus of mirror and illuminate the lens of the substrate on a platform.
Preferably, at least one light source, mirror and lens are arranged.
In others of the present invention, a kind of lighting device that is used to check substrate is provided, comprise: a plurality of be used for reflecting respectively from a plurality of a left side, curved surface upper edge/right side and/mirror of the light of the light source that moves of at least one direction down, partly overlap the adjacent ray that reflects on the mirror with being used for, make it focus on a focus, and illuminate the lens of the substrate on platform.
These lens comprise: a upper lens that is used for the dispersed light from mirror is pooled directional light, a lower lens that is used to make the directional light by this upper lens transmission to focus on a focus and illuminate substrate, with a liquid crystal board that is connected with this lower lens, this liquid crystal board is used for changing between transparent and opaque state according to the electric energy that provides, so that produce direct light or scattered light.
This lighting device comprises that further being used to of being electrically connected with this liquid crystal board provides the battery of electric energy and one to be used for the switch block that on/off is controlled from the electric energy of battery so that to this liquid crystal board.
Be appreciated that above-mentioned explanation of the present invention and following detailed description all are illustrative and indicative, its purpose is to provide further explanation to the scope of protection of present invention.
Description of drawings
The present invention is further detailed by accompanying drawing, and these accompanying drawings describe embodiments of the invention with instructions in conjunction with in this application and constitute the application's a part, illustrate inventive concept of the present invention.In the accompanying drawings:
Fig. 1 has shown the cut-open view of lighting device that is used to check substrate of prior art;
Fig. 2 A is the stereographic map that first kind of prior art is used to check the lighting device of substrate, and Fig. 2 B is the planimetric map of a substrate of this lighting device;
Fig. 3 A is the stereographic map that second kind of prior art is used to check the lighting device of substrate, and Fig. 3 B is the planimetric map of a substrate of this lighting device;
Fig. 4 A is the stereographic map that the third of prior art is used to check the lighting device of substrate, and Fig. 4 B is the planimetric map of a substrate of this lighting device;
Fig. 5 A shows the lighting device that is used to check substrate according to the first embodiment of the present invention, and Fig. 5 B is the planimetric map of a substrate of this lighting device;
Fig. 6 A shows the lighting device that is used to check substrate according to a second embodiment of the present invention, and Fig. 6 B is the planimetric map of a substrate of this lighting device;
Fig. 7 A shows the lighting device that is used to check substrate of a third embodiment in accordance with the invention, and Fig. 7 B is the planimetric map of a substrate of this lighting device;
Fig. 8 has shown a Fresnel lens that is used for checking the lighting device of substrate according to a preferred embodiment of the invention.
Embodiment
Now will be in detail with reference to the preferred embodiments of the present invention, in conjunction with the accompanying drawings content of the present invention is elaborated.The embodiment that accompanying drawing 5A and 5B show illustrates according to the first embodiment of the present invention, the lighting device that is used to check substrate when only using a lighting device.
Referring to Fig. 5 A, this is used to check that the lighting device of substrate comprises: a mirror 120, this mirror are used to reflect the light from light source 110, this light source on a curved surface upper edge/down or a left side/right move; With a Fresnel lens 200, this Fresnel lens is used for that the light of dispersing from mirror 120 focused on focus ' P ' and illuminates substrate 300 on the platform.
In this case, referring to Fig. 5 B, the described light of dispersing that is reflected at mirror 120 is focused and shines substrate 300 by Fresnel lens 200.Shine the light on the substrate 300, along with lighting device move along last/down or a left side/right move.
By this light source is moved on curved surface, when light source along last/down or a left side/right when moving, this lighting device can focus light rays at focus ' P ', and according to these characteristics, operating personnel can check this substrate at identical point ' S ' under the situation that does not move this focus.
Fig. 6 A and 6B show that according to a second embodiment of the present invention one is used to check the planimetric map of a substrate of the stereographic map of lighting device of substrate and this lighting device, has wherein used a plurality of lighting devices.
Referring to Fig. 6 A, this is used to check that the lighting device of substrate comprises: a plurality of be used to reflect from a plurality of in the curved surface upper edge/down or the mirror 120 (120 ') of the light source 110 (110 ') that moves of a left side/right; With a plurality of Fresnel lenses 200 (200 ') that are used for that the light of dispersing from mirror 120 (120 ') focused on focus ' P ' and are radiated at the substrate 300 on the platform.
In this case, referring to Fig. 6 B, the light of dispersing that reflects at mirror 120 (120 ') converges and shines on the large tracts of land of substrate 300 at Fresnel lens 200 (200 ').This light that shines substrate 300 along with lighting device move last/down or a left side/right move.
By using a plurality of lighting devices, can shine most of zone of the substrate of the whole width that is enough to covering substrate, so only need these lighting devices to move along last/following direction.When these lighting devices along last/when following direction moved, by moving on curved surface, lighting device can converge to a focus ' P ' to light.
When lighting device is mobile on curved surface, that converge by Fresnel lens 200 (200 ') and the light of directive substrate 300 last/down or a left side/right move, has a focus ' P ', in view of the above, operating personnel can check this substrate under the situation of same position ' S ' at moving focal point not.
Fig. 7 A and 7B are the stereographic maps of lighting device that is used to check substrate of a third embodiment in accordance with the invention, planimetric map with a substrate of this lighting device, wherein under the situation of using a plurality of lighting devices as shown in Figure 6A, dark area between the adjacent illumination devices is eliminated, so that light is radiated on the big substrate equably.
Referring to Fig. 7 A, this is used to check that the lighting device of substrate comprises: a plurality of mirrors 120 (120 ') that are used for reflecting respectively from the light of a plurality of light sources 110 (110 '); With a plurality of Fresnel lenses 200 (200 '), Fresnel lens is used to make from the light of the adjacent scattering of mirror 120 (120 ') overlaps, and and scattered light converged to a focus ' P ', to illuminate the substrate 300 on the platform.
In this case, referring to Fig. 7 B, the adjacent scattered light of preferred this directive substrate 300 partly superposes at this first Fresnel lens 200 and second Fresnel lens 200 ', and first Fresnel lens 200 is near second Fresnel lenses 200 ', do not have dark area to form between a plurality of Fresnel lens 200,200 ' like this.
In order to focus on a focus shining (incident) scattered beam to a plurality of Fresnel lenses 200, described a plurality of lighting device is arranged on the curved surface, wherein each lighting device has a light source 110,120, one Fresnel lenses 200 of mirror.In addition, the position of at least one mirror 120 or Fresnel lens 200 can be moved, thereby changes incident angle or reflection angle from the light of light source, and adjacent scattered beam is overlapped.
Referring to Fig. 8, preferred a plurality of Fresnel lenses 200 comprise: a top Fresnel lens 201 that is used for scattered light is pooled directional light; A bottom Fresnel lens 203 that is used for the directional light by these top Fresnel lens 201 transmission is converged and illuminates substrate 300; One is used for changing between transparent and opaque state according to the electric energy that applies attached on the bottom Fresnel lens 203, so that produce the liquid crystal board 205 of direct light or scattered light; A switch 400 that is used to control liquid crystal board 205; With a battery 500 that is used for providing electric energy to liquid crystal board 205 according to the conversion of switch 400.
Of the present inventionly be used to check that the operation of the lighting device of substrate will be described hereinbelow in detail with reference to the accompanying drawings.
Referring to Fig. 5 A and 5B, under the situation of only using a lighting device, disperseed at mirror 120 from the light of light source 110, and towards Fresnel lens 200 reflections.
The scattered light that is reflected at mirror 120 is pooled directional light at top Fresnel lens 201, is converged once more at bottom Fresnel lens 203, and illuminates substrate 300 on the platform.
Therefore, when this lighting device on a curved surface upper edge/down or a left side/right when moving, this lighting device illuminates whole substrate.Because this lighting device moves on this curved surface, make the light of directive substrate converge to focus ' P ' and become easily, operating personnel can utilize the reflected light inspection substrate at substrate by under the situation of same position ' S ' at moving focal point not.
And the liquid crystal board 205 below bottom Fresnel lens 203 is converted, and when operating personnel observed substrate 300, light only illuminated substrate like this.In other words, by the switching of switch 400, rely on the external energy that applies, this liquid crystal board 205 can switch between transparent and opaque state.
When this switch 400 is closed, the energy of battery 500 is not provided, these liquid crystal board 205 scattered beams, so that stop substrate 300 to be shone brightly, and only be unlocked so that when the energy of battery 500 is provided at this switch 400, these liquid crystal board 205 transmission rays are so that provide a kind of direct light to shine substrate 300 brightly.
Then, when on the curved surface upper edge/down or a left side/right when moving this lighting device, adjust incident angle, reflection angle, wavelength, light intensity, scattering and polarisation of light direction, so that optimize the different visual condition of substrate.When illuminating the whole zone of substrate equably, seek on-chip spot and defective.
Then, see also Fig. 6 A and 6B and 7A and 7B, the situation of using a plurality of lighting devices is discussed.For the purpose of simplifying the description, supposing has two identical light sources, and two identical mirrors are with two identical Fresnel lenses.
Light from first and second light sources 110 and 110 ' is scattered, and reflects towards first and second Fresnel lenses 200 and 200 ' at first and second mirror 120 and 120 '.
Scattered light in first and second mirror 120 and 120 ' reflection pools directional light at the top Fresnel lens 201 (referring to Fig. 8) of first and second Fresnel lenses 200 and 200 ', and is converged once more and illuminate this substrate 300 at this bottom Fresnel lens 203.
In this case, shown in Fig. 7 A and 7B, in order to prevent between adjacent Fresnel lens 200 and 200 ', to form dark area, from first Fresnel lens 200 and near the scattered beam of second Fresnel lens, 200 ' the directive substrate 300 of this first Fresnel lens 200 by partly overlapping.
When on a curved surface upper edge/when following direction moved, lighting device illuminated the whole surface of substrate.Lighting device mobile on curved surface helps to focus light onto a focus ' P ', can make operating personnel utilize reflection of light, under the situation of moving focal point not, checks substrate at identical point ' S '.
In addition, the liquid crystal board 205 below this bottom Fresnel lens 203 is switched, and when operating personnel observed substrate 300, light only illuminated substrate like this.In other words, by the switching of switch 400, rely on to apply outside energy, this liquid crystal board 205 switches between transparent and opaque state.
When switch 400 is closed, and when the energy of battery 500 is not provided, these liquid crystal board 205 scattered lights, prevent that substrate 300 from being illuminated brightly, and when just thinking that switch 400 is switched on, battery 500 provides energy, and these liquid crystal board 205 transmission light are so that provide direct projection bright position ground irradiation substrate 300.
And, when lighting device curved surface along on/when following direction moves, adjust incident angle, reflection angle, wavelength, light intensity, scattering and polarisation of light direction, so that optimize the different visual condition of substrate.Then, when illuminating the whole zone of substrate equably, search the defective and the spot of substrate.
According to above explanation, lighting device of the present invention has the following advantages.
At first, use bulk zone that multi-beam illuminates large size substrate to simplify the mobile system of this lighting device, and operating personnel just can be at a focus inspection substrate surface without moving focal point.
Second, under the situation of using a plurality of lighting devices, elimination can increase the reliability that the surface of large size substrate is checked in the generation of irradiated substrate top shadow (dark area), does not reduce output and can boost productivity on the contrary, and produce high-quality and product high security.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. lighting device that is used to check substrate comprises:
A plurality of mirrors that are used for reflecting respectively from the light of a plurality of light sources; With
A plurality of lens that are used for that the light from described mirror focused on a focus and illuminate the substrate on a platform, wherein each described lens comprises: upper lens is used for the optical convergence from described mirror is become directional light; Lower lens is used for the directional light by described upper lens transmission is focused on focus and illuminates described substrate; And liquid crystal board, on described lower lens, be used between transparent and opaque state, changing according to the electric energy that applies, to produce direct light or scattered light, described a plurality of mirror, light source and lens form multiple arrangement, described multiple arrangement is arranged on the curved surface, and at least one the position in described mirror or the described lens can be moved, to change incident angle or the reflection angle from the light of described light source.
2. lighting device according to claim 1, wherein said be focused and to illuminate the light of substrate partly overlapping between adjacent ray.
3. lighting device according to claim 1, wherein focusing the light into a focus is by at least one mirror and Fresnel lens in the removable lighting, so that adjust from the incident angle of the light of described a plurality of light sources or reflection angle and realize that described lighting device comprises light source, mirror and Fresnel lens.
4. lighting device according to claim 1, wherein said only scattering from light source.
5. lighting device that is used to check substrate comprises:
One be used for reflecting come a left side, a comfortable curved surface upper edge/right side and/mirror of the light of the light source that at least one direction of following direction moves; With
Lens that are used for that the light from described mirror focused on a focus and illuminate the substrate on a platform.
6. lighting device according to claim 5, the light that wherein illuminates substrate be along with the curved surface of light source moves, along last/down or a left side/right move.
7. lighting device according to claim 5, wherein the light from described light source is scattered.
8. lighting device according to claim 5, wherein said lens comprise;
A upper lens that is used for the light from described mirror is pooled directional light;
The lower lens that will focus on a focus by the directional light of described upper lens transmission and illuminate described substrate; With
A liquid crystal board that is connected with described lower lens is used to rely on the electric energy that applies to change between transparent and opaque state, so that produce direct light or scattered light.
9. according to claim 1 or 8 described lighting devices, further comprise one be electrically connected with described liquid crystal board be used to provide electric energy battery and
An electric energy that is used for on/off from described battery is so that control the switch block of described liquid crystal board.
10. lighting device that is used to check substrate comprises:
A plurality of be used for reflecting respectively from a plurality of a left side, curved surface upper edge/right side and/mirror of the light of the light source that at least one direction of following direction moves; With
Be used to make the adjacent light portion that on described mirror, reflects overlapping, focus on a focus, and illuminate the lens of the substrate on a platform.
11. lighting device according to claim 10, wherein said adjacent light is by moving at least one mirror or lens, so that adjustment realizes overlapping from the incident angle or the reflection angle of the light of described a plurality of light sources.
12. lighting device according to claim 10, the wherein said light source that moves on curved surface makes light move in last/following direction and to illuminate described substrate along with moving of light source.
13. lighting device according to claim 10, incident angle, reflection angle, wavelength, intensity, scattering and the polarization direction of wherein illuminating the light of described substrate can be adjusted, so that increase the accuracy of checking.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2003-0029959 | 2003-05-12 | ||
| KR1020030029958 | 2003-05-12 | ||
| KR1020030029958A KR20040097616A (en) | 2003-05-12 | 2003-05-12 | lighting apparatus for inspection substrate |
| KR10-2003-0029958 | 2003-05-12 | ||
| KR1020030029959 | 2003-05-12 | ||
| KR1020030029959A KR20040097617A (en) | 2003-05-12 | 2003-05-12 | lighting apparatus for inspection substrate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1548947A CN1548947A (en) | 2004-11-24 |
| CN1292246C true CN1292246C (en) | 2006-12-27 |
Family
ID=34380466
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03156997 Expired - Fee Related CN1292246C (en) | 2003-05-12 | 2003-09-17 | Lighting device for testing substrate |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1292246C (en) |
| TW (1) | TWI270670B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20130140058A (en) * | 2010-12-09 | 2013-12-23 | 아사히 가라스 가부시키가이샤 | Method and system for measuring defect in glass ribbon |
| CN103278917A (en) * | 2013-06-09 | 2013-09-04 | 盖志武 | Fresnel lens system with variable focuses |
| CN103336357A (en) * | 2013-06-09 | 2013-10-02 | 盖志武 | Fresnel lens system with position adjustable focuses |
| CN104390174B (en) * | 2014-10-16 | 2017-03-08 | 北京凌云光技术有限责任公司 | Light supply apparatus and the TFT LCD detecting system using the device |
| CN107589072A (en) * | 2017-08-30 | 2018-01-16 | 东莞新友智能科技有限公司 | A kind of light supply apparatus for Surface testing |
| CN108375358B (en) * | 2018-02-09 | 2019-11-12 | 乐福特科技（深圳）有限公司 | A kind of nonstandard components detection platform of the rotating illuminating formula with stationary fixture |
| JP6867533B1 (en) | 2020-05-20 | 2021-04-28 | 株式会社アルス | Light source device |
-
2003
- 2003-09-09 TW TW92124874A patent/TWI270670B/en not_active IP Right Cessation
- 2003-09-17 CN CN 03156997 patent/CN1292246C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1548947A (en) | 2004-11-24 |
| TWI270670B (en) | 2007-01-11 |
| TW200424510A (en) | 2004-11-16 |
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