EP0895649A1 - Method and apparatus for removing dust from shadow mask - Google Patents

Method and apparatus for removing dust from shadow mask

Info

Publication number
EP0895649A1
EP0895649A1 EP97950454A EP97950454A EP0895649A1 EP 0895649 A1 EP0895649 A1 EP 0895649A1 EP 97950454 A EP97950454 A EP 97950454A EP 97950454 A EP97950454 A EP 97950454A EP 0895649 A1 EP0895649 A1 EP 0895649A1
Authority
EP
European Patent Office
Prior art keywords
shadow mask
dust removal
dust
dust removing
removing apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP97950454A
Other languages
German (de)
French (fr)
Inventor
Sheung Ihn Samsung 3rd Apt. CHO
Jae Bong Yukseong Villa YEOM
Chang Hee 17-2 7 6-ga JANG
Hyung S. Yoowon Jeil Apt. 4-1005 YOON
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung SDI Co Ltd
Original Assignee
Samsung Display Devices Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR2019960064424U external-priority patent/KR200149630Y1/en
Priority claimed from KR1019970028478A external-priority patent/KR19990004387A/en
Priority claimed from KR1019970028477A external-priority patent/KR19990004386A/en
Application filed by Samsung Display Devices Co Ltd filed Critical Samsung Display Devices Co Ltd
Publication of EP0895649A1 publication Critical patent/EP0895649A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels

Definitions

  • the present invention relates to a method and apparatus for removing
  • CRTs cathode ray tubes
  • the CRT includes a phosphor
  • the shadow mask includes a mask having a plurality of beam-guide
  • the beam-guide apertures land the electron beams deflected by the
  • the electron beams are partly or entirely blocked in the beam-guide
  • ultrasonic cleaning process are usually employed to remove the defect.
  • processing the shadow mask is completed because it not only decreases the production effects but also increases the production costs.
  • the present invention is directed to a method and
  • An object of the present invention is to provide a method and apparatus
  • the shadow mask is not only fed to but also immovably fixed on the dust removal position so as to prevent it from
  • Shadow mask is delivered to a next process.
  • the dust removing apparatus for performing the aforementioned dust
  • removing operation includes a shadow mask feeding and delivering unit for
  • the dust removing apparatus according to the present invention may
  • the dust removing apparatus for removing the dusts adhered on the
  • exterior of the shadow mask includes a shadow mask feeding and delivering
  • the dust removing apparatus may be also an apparatus for removing
  • the dust removing apparatus for removing the dusts adhered on the
  • the interior of the shadow mask includes a shadow mask feeding and delivering
  • the dust removing apparatus may be also an apparatus for
  • the dust removing apparatus for simultaneously removing the dusts
  • an internal dust removing unit for removing the dusts adhered on the
  • the beam-guide aperture clogging defect can be removed owing to rapid and
  • Fig. 1 is a front view of a dust removing apparatus for removing dusts
  • Fig. 2a is a front view showing the initial state of the dust removing
  • Fig. 2b is a front view showing the state of the dust removing apparatus
  • Fig. 2c is a front view of the dust removing apparatus showing the
  • Fig. 3 is a perspective view of a dust removing apparatus for removing dusts from the interior of a shadow mask according to a second preferred
  • Fig. 4 is a plan view of the dust removing apparatus according to the
  • Fig. 5a is a front view showing the initial state of the dust removing
  • Fig. 5b is a fragmentary sectional front view showing the state of the
  • Fig. 5c is a fragmentary sectional front view showing the state of the
  • Fig. 5d is a fragmentary sectional front view showing the state of the
  • Fig. 6 is a perspective view of a dust removing apparatus for
  • Fig. 7a is a front view showing the initial state of the dust removing
  • Fig. 7b is a front view showing the state of the dust removing apparatus
  • Fig. 7c is a front view showing the state of the dust removing apparatus
  • Fig. 7d is a front view showing the state of the dust removing apparatus
  • the shadow mask according to the third preferred embodiment.
  • present invention includes a shadow mask feeding and delivering unit for
  • Fig. 1 is a front view of a dust removing apparatus for removing dusts
  • Fig. 2a is a front view showing the initial state of the dust
  • Fig. 2b is a
  • FIG. 1 front view showing the state of the dust removing apparatus in which a dust
  • Fig. 2c is a front view of the
  • the dust removing apparatus for removing dusts from the exterior of
  • shadow mask feeding and delivering unit for feeding the shadow mask S to a
  • the shadow mask feeding and delivering unit includes a conveyer C for
  • the conveyer C is arranged between delivering devices (not shown).
  • the conveyer C is a roller conveyer, but a belt
  • the external dust removing unit includes a base frame 1 positioned
  • a dust removal tape 3 having a side applied with adhesive materials, a tape guide unit for guiding the dust removal tape 3 onto
  • the roller conveyer C is provided with a regular position stopper 5 for
  • position stopper 5 is driven by an actuator (not shown).
  • the roller conveyer C is further provided with an interference
  • stopper supporting members are disposed on both sides of a conveyer frame 9
  • the regular position stopper 5 is
  • the dust removal tape 3 has an end wound on a circular winding base
  • the dust removal tape 3 also has an opposing end wound on the
  • winding base (not shown) mounted on a winding roller 13.
  • roller 13 is spaced apart from the rotary roller 11 with a predetermined distance.
  • the width of the dust removal tape 3 is greater than that of a mask
  • the dust removal tape 3 is a polyethylene tape and has a thickness of 0.05 mm, an adhesive force of 120g/25 mm, a tensional
  • the tape guide unit includes two elevators 15 and 17 fixed on the base
  • the elevators 15 and 17 includes guide cylinders 15a and 17a for
  • the guide cylinders 15a and 17a are arranged between the rotary roller
  • guide cylinders 15a and 17a should be at least longer than the longitudinal
  • guide rollers 15c and 17c are vertically provided under the
  • Guide members 15d and 17d are also provided at the bottom of the guide
  • pistons 15b and 17b to combine the guide pistons 15b and 17b with the guide
  • rollers 15c and 17c such that the guide rollers 15c and 17c can be rotated.
  • the winding roller 13 is arranged above the shadow mask S by the guidance of
  • the shadow mask S makes in contact with the exterior of the shadow mask S.
  • the dust removal tape 3 does not uniformly contact the overall surface of the shadow mask S because an air is remained on the
  • contact unit spurts high-pressure air on the contact side between the dust
  • the pressure contact unit includes two pressure cylinders 19 for
  • a motor 21 is connected to the winding roller 13.
  • the winding roller 13 is rotated by the motor 21 to wind the dust removal tape 3
  • shadow mask S is continuously replaced by a new one so that deterioration in
  • the dust removal efficiency can be prevented. As described above, when the dust removal tape 3 is attached on or
  • the shadow mask S should be fixed on the dust removal position
  • each are driven by an actuator (not shown) and pressurize the skirt of the
  • the supporting rollers 25 prevent the
  • interference prevention stopper 7 is protruded backward the interference prevention stopper 7
  • shadow mask S and prevents it from interfering with a following shadow mask S.
  • pistons 19a is spaced apart from the dust removal tape 3 contacting the
  • the air feeder 19b spurts high-pressure air on the dust removal tape 3
  • the motor 21 rotates the winding roller 13 with a predetermined
  • roller conveyer C delivers the dust-removed shadow
  • the dust removing operation can be continuously performed through
  • FIG. 3 is a perspective view of a dust removing apparatus for removing
  • Fig. 4 is a plan view of the dust removing
  • Fig. 5a is a front
  • Fig. 5b is a fragmentary sectional front view
  • Fig. 5c is a fragmentary
  • a balloon is blown up and a dust removal tape is attached on the interior of the
  • Fig. 5d is a fragmentary sectional front view showing the
  • the dust removing apparatus for removing dusts from the interior of the
  • shadow mask feeding and delivering unit for feeding the shadow mask S to a
  • roller conveyer C1 is also a roller conveyer C1 as is in the first preferred
  • roller conveyer C1 is
  • the internal dust removing unit includes a dust removal tape 33 and a
  • removal tape 33 is a polyethylene tape as is in the first preferred embodiment.
  • the tape attachment unit includes a balloon 45 positioned under the
  • the dust removal tape 33 has an end wound on a circular winding base
  • the dust removal tape 33 also has an opposing end
  • the dust removal tape 33 lengthened between the rotary roller 41 and
  • the winding roller 43 is positioned between the shadow mask S and the balloon
  • a pipe 47 is connected to the bottom of the balloon 45.
  • the pipe is to feed air into the balloon 45 to inflate it while the pipe supports the
  • the balloon 45 inflates to uniformly attach the dust removal tape 33 on
  • the balloon 45 should be elevated toward the interior of the shadow
  • a hose 49a is connected to one side of the lift 49 to feed high-pressure
  • the lift 49 receives high-pressure air from the hose 49a to feed it
  • a motor 51 is connected to the winding roller 43 to rotate it and thereby
  • interference prevention stopper 37 is also protruded to prevent the shadow
  • the balloon 45 is inflated upon receipt of air from the lift 49
  • the dust removal tape 33 may still be attached
  • the motor 51 rotates the winding roller 43 with a predetermined angle to
  • stopper 37 enter into the stopper supporting members 39b respectively and the
  • roller conveyer C1 delivers the dust-removed
  • Fig. 6 is a perspective view showing a dust removal apparatus for
  • Fig. 7a is a
  • Fig. 7b is a front view showing the state of the third preferred embodiment
  • Fig. 7c is a front view showing the state of the dust removing
  • Fig. 7d is a front view
  • the dust removing apparatus for simultaneously removing dusts from
  • stoppers 93 as are in the previous preferred embodiments.
  • the external dust removing unit includes a base frame 61 positioned
  • a tape guide unit for guiding the first dust
  • the first dust removal tape 63 has an end wound on a circular winding
  • the first dust removal tape 63 also has an opposing end wound on the
  • winding roller 73 is
  • the first dust removal tape 63 is a polyethylene tape as is in the first
  • the tape guide unit includes two elevators 75 and 77 fixed on the base
  • the elevators 75 and 77 include guide cylinders 75a and 77a for
  • the guide cylinders 75a and 77a is arranged between the rotary roller
  • the distance between the guide cylinders 75a and 77a should be at least longer than the longitudinal
  • guide rollers 75c and 77c are vertically provided under the
  • Guide members 75d and 77d are also provided at the bottom of the guide
  • rollers 75c and 77c such that the guide rollers 75c and 77c can be rotated.
  • pressure contact unit spurts high-pressure air on the contact side between the first dust removal tape 63 and the shadow mask S.
  • the pressure contact unit includes two pressure cylinders 79 for
  • a motor 80 is connected to the winding roller 73.
  • the winding roller 73 is rotated by the motor 21 to wind the first dust removal
  • roller 73 and the other guide roller 77c.
  • the supporting rollers 85 prevent the
  • the internal dust removing unit includes a second dust removal tape 63
  • the tape attachment unit includes a balloon 85 positioned under the
  • the second dust removal tape 63 has an end wound on a circular
  • the second dust removal tape 63 lengthened between the rotary roller
  • a pipe 87 is connected to the bottom of the balloon 85.
  • the pipe is to feed air into the balloon 85 to inflate it while the pipe supports the
  • the balloon 85 inflate to uniformly attach the second dust removal tape
  • the upper portion of the inflated balloon 85 has the same curvature as the
  • the balloon 85 should be elevated toward the interior of the shadow
  • lift 89 is connected to the bottom of the pipe 87 to elevate the balloon 85
  • the lift 89 receives high-pressure air from the external to feed it into the
  • a motor 90 is connected to the winding roller 83 to rotate it and thereby
  • interference prevention stopper 67 is also protruded to prevent the shadow
  • pistons 79a is spaced apart from the first dust removal tape 63 contacting the
  • the air feeder 79b spurts high-pressure air on the first dust removal
  • the motor 80 rotates the winding roller 73 with a predetermined
  • the balloon 85 is inflated upon receipt of air from the lift 89
  • the second dust removal tape 63 may still be
  • the motor 90 rotates the winding roller 83 with a
  • roller conveyer C2 delivers the dust-removed
  • the beam-guide aperture clogging defect can be removed owing to rapid and

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Cleaning In General (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)

Abstract

A method of removing dust from a shadow mask (S) includes the steps of feeding the shadow mask to a dust removal position, removing dust adhered to the shadow mask, and delivering the dedusted shadow mask to a next process. The freeing from dust is made by a dust removal tape (3) having a contact side with a gummed coating. The dust is removed from both sides of the shadow mask from the inside and from the outside, and at the same time the shadow mask is supported by a balloon.

Description

METHOD AND APPARATUS FOR REMOVING DUSTS
FROM SHADOW MASK
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and apparatus for removing
dusts from a shadow mask and, more particularly, to a dust removing method
and apparatus for a shadow mask which can effectively prevent beam-guide
apertures of the shadow mask from being clogged by alien substances.
2. Description of the Related Art
Generally, cathode ray tubes (CRTs) are designed to reproduce the
original picture image on a glass screen through receiving the picture image
signals from the external and exciting phosphors coated on the screen with
electron beams in accordance with the signals. The CRT includes a phosphor
screen on which three different phosphors of the red, green and blue are
coated, a shadow mask having a color selection function, an electron gun for
emitting electron beams, and a deflection yoke for scanning the electron beams
on the phosphor screen.
The shadow mask includes a mask having a plurality of beam-guide
apertures in its center, and a skirt bent toward the reverse side to the phosphor
screen. The beam-guide apertures land the electron beams deflected by the
deflection yoke on the corresponding phosphors of the screen. Meanwhile, in the course of shadow mask processing, alien substances
like oily, floating or metallic materials in the environment (referred to hereinafter
more simply as 'dusts') are frequently adhered to the mask, causing the beam-
guide apertures formed on the mask to be clogged.
When the beam-guide apertures of the shadow mask is clogged by the
dusts, the electron beams are partly or entirely blocked in the beam-guide
apertures so that the degree of excitation against the phosphors is deteriorated
or serious defects in reproduction of the original picture image is generated.
As described above, the phenomenon that the beam-guide apertures
are clogged by the dusts is called a beam-guide aperture clogging defect and
considered to be necessarily removed. And a degreasing process and an
ultrasonic cleaning process are usually employed to remove the defect.
As described above, although the conventional method of removing the
beam-guide aperture clogging defect is performed satisfactorily and the dusts
adhered on the shadow mask are entirely removed, the beam-guide apertures
may be repeatedly clogged due to dusts newly adhered to the shadow mask
during many types of processes before the step of sealing the shadow mask
through firmly bonding together the panel and funnel or during the delivering
operation of the shadow mask from one process to the following processing
step.
Furthermore, it is undesirable to perform the degreasing or ultrasonic
cleaning process with respect to the shadow mask whenever each step of
processing the shadow mask is completed because it not only decreases the production effects but also increases the production costs.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a method and
apparatus for removing dusts from the shadow mask which substantially
obviates one or more of the problems due to limitations and disadvantages of
the related art.
An object of the present invention is to provide a method and apparatus
for removing dusts from a shadow mask which can maximize the dust removing
effects while its installation as well as its maintenance is easily realized at a low
cost.
Additional features and advantages of the invention will be set forth in
the description which follows, and in part will be apparent from the description,
or may be learned by practice of the invention. The objects and other
advantages of the invention will be realized and attained by the structure
particularly pointed out in the written description and claims hereof as well as
the appended drawings.
To accomplish these and other advantages, the dust removing method
for the shadow mask includes the steps of feeding a shadow mask to a dust
removal position, removing the dusts adhered on the shadow mask by using a
dust removal tape for adhering the dusts, and delivering the dust-removed
shadow mask to a next process.
In the shadow mask feeding step, the shadow mask is not only fed to but also immovably fixed on the dust removal position so as to prevent it from
being shaken or broken away therefrom.
In the subsequent dust removing step, the dusts adhered on the
shadow mask is removed and thus, the beam-guide clogging defect is also
removed.
Thereafter, in the shadow mask delivering step, the dust-removed
shadow mask is delivered to a next process.
The dust removing apparatus for performing the aforementioned dust
removing operation includes a shadow mask feeding and delivering unit for
feeding the shadow mask to a dust removal position and delivering the dust-
removed shadow mask to a next process, and a dust removing unit for
removing the dusts adhered on the shadow mask at the dust removal position
by using a dust removal tape for adhering the dusts.
The dust removing apparatus according to the present invention may
be an apparatus for removing dusts from the exterior of a shadow mask.
The dust removing apparatus for removing the dusts adhered on the
exterior of the shadow mask includes a shadow mask feeding and delivering
unit for feeding the shadow mask to a dust removal position and delivering the
dust-removed shadow mask to a next process, and an external dust removing
unit for removing the dusts adhered on the exterior of the shadow mask at the
dust removal position by using a dust removal tape for adhering the dusts.
The dust removing apparatus may be also an apparatus for removing
dusts from the interior of a shadow mask. The dust removing apparatus for removing the dusts adhered on the
interior of the shadow mask includes a shadow mask feeding and delivering
unit for feeding the shadow mask to a dust removal position and delivering the
dust-removed shadow mask to a next process, and an internal dust removing
unit for removing the dusts adhered on the interior of the shadow mask at the
dust removal position by using a dust removal tape for adhering the dusts.
The dust removing apparatus may be also an apparatus for
simultaneously removing dusts from the interior and exterior of a shadow mask.
The dust removing apparatus for simultaneously removing the dusts
adhered on the interior and exterior of the shadow mask includes a shadow
mask feeding and delivering unit for feeding the shadow mask to a dust
removal position and delivering the dust-removed shadow mask to a next
process, an internal dust removing unit for removing the dusts adhered on the
interior of the shadow mask at the dust removal position by using a first dust
removal tape for adhering the dusts, and an external dust removing unit for
removing the dusts adhered on the exterior of the shadow mask at the dust
removal position by using a second dust removal tape for adhering the dusts.
As described above, in the inventive method and apparatus for
removing dusts from the shadow mask, the dusts adhered on the shadow mask
are rapidly removed so that the cleanness of the shadow mask can be
constantly kept. Furthermore, it is installed at a low cost and narrow space
and thus, several devices can be provided to remove the dusts adhered on the
shadow mask in the course of the shadow mask processing. In addition, the beam-guide aperture clogging defect can be removed owing to rapid and
effective removal of the dusts from the shadow mask.
It is to be understood that both the foregoing general description and
the following detailed description are exemplary and explanatory and are
intended to provide further explanation of the invention as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings, which are included to provide a further
understanding of the invention and are incorporated in and constitute a part of
this specification, illustrate a particular embodiment of the invention and,
together with the description, serve to explain the principles of the invention.
In the drawings:
Fig. 1 is a front view of a dust removing apparatus for removing dusts
from the exterior of a shadow mask according to a first preferred embodiment of
the present invention;
Fig. 2a is a front view showing the initial state of the dust removing
apparatus according to the first preferred embodiment;
Fig. 2b is a front view showing the state of the dust removing apparatus
in which a dust removal tape is attached on the shadow mask, according to the
first preferred embodiment;
Fig. 2c is a front view of the dust removing apparatus showing the
operation of a pressure cylinder according to the first preferred embodiment;
Fig. 3 is a perspective view of a dust removing apparatus for removing dusts from the interior of a shadow mask according to a second preferred
embodiment of the present invention;
Fig. 4 is a plan view of the dust removing apparatus according to the
second preferred embodiment;
Fig. 5a is a front view showing the initial state of the dust removing
apparatus according to the second preferred embodiment;
Fig. 5b is a fragmentary sectional front view showing the state of the
dust removing apparatus in which a pipe is elevated, according to the second
preferred embodiment;
Fig. 5c is a fragmentary sectional front view showing the state of the
dust removing apparatus in which a balloon is blown up and a dust removal
tape is attached on the interior of the shadow mask; according to the second
preferred embodiment;
Fig. 5d is a fragmentary sectional front view showing the state of the
dust removing apparatus in which a pipe is lowered, according to the second
preferred embodiment;
Fig. 6 is a perspective view of a dust removing apparatus for
simultaneously removing dusts from the interior and exterior of a shadow mask
according to a third preferred embodiment of the present invention;
Fig. 7a is a front view showing the initial state of the dust removing
apparatus according to the third preferred embodiment;
Fig. 7b is a front view showing the state of the dust removing apparatus
in which dust removing tapes are attached on the interior and exterior of the shadow mask, according to the third preferred embodiment;
Fig. 7c is a front view showing the state of the dust removing apparatus
in which the dust removing tapes are uniformly attached on the interior and
exterior of the shadow mask by the operation of an air feeder and a balloon,
according to the third preferred embodiment; and
Fig. 7d is a front view showing the state of the dust removing apparatus
in which the dust removing tapes are detached from the interior and exterior of
the shadow mask, according to the third preferred embodiment.
In the following detailed description, only the preferred embodiment of
the invention has been shown and described, simply by way of illustration of the
best mode contemplated by the inventor(s) of carrying out the invention. As
will be realized, the invention is capable of modification in various obvious
respects, all without departing from the invention. Accordingly, the drawing
and description are to be regarded as illustrative in nature, and not as
restrictive.
DETAILED DESCRIPTION OF THE INVENTION
Reference will now be made in detail to the preferred embodiments of
the present invention, examples of which are illustrated in the accompanying
drawings.
The dust removing apparatus for the shadow mask according to the
present invention includes a shadow mask feeding and delivering unit for
feeding the shadow mask to a dust removal position and delivering the dust- removed shadow mask to a next process, and a dust removing unit for
removing the dusts adhered on the shadow mask at the dust removal position.
Fig. 1 is a front view of a dust removing apparatus for removing dusts
from the exterior of a shadow mask according to a first preferred embodiment of
the present invention, Fig. 2a is a front view showing the initial state of the dust
removing apparatus according to the first preferred embodiment, Fig. 2b is a
front view showing the state of the dust removing apparatus in which a dust
removal tape is attached on the shadow mask, and Fig. 2c is a front view of the
dust removing apparatus showing the operation of a pressure cylinder
according to the first preferred embodiment.
The dust removing apparatus for removing dusts from the exterior of
the shadow mask according to the first preferred embodiment includes a
shadow mask feeding and delivering unit for feeding the shadow mask S to a
dust removal position and delivering the dust-removed shadow mask S to a
next process, and an external dust removing unit for removing the dusts
adhered on the exterior of the shadow mask at the dust removal position.
The shadow mask feeding and delivering unit includes a conveyer C for
smoothly guiding the shadow mask S.
The conveyer C is arranged between delivering devices (not shown).
In this preferred embodiment, the conveyer C is a roller conveyer, but a belt
conveyer is also applicable.
The external dust removing unit includes a base frame 1 positioned
above the roller conveyer C, a dust removal tape 3 having a side applied with adhesive materials, a tape guide unit for guiding the dust removal tape 3 onto
the exterior of the shadow mask S to attach it thereon or detach it therefrom.
The roller conveyer C is provided with a regular position stopper 5 for
stopping the shadow mask S on the dust removal position. The regular
position stopper 5 is driven by an actuator (not shown).
The roller conveyer C is further provided with an interference
prevention stopper 7 for preventing the shadow mask fixed on the dust removal
position from interfering with a following shadow mask.
The regular position stopper 5 and the interference prevention stopper
7 are installed on stopper supporting members (not shown) respectively. The
stopper supporting members are disposed on both sides of a conveyer frame 9
centering around the dust removal position. The regular position stopper 5 is
placed on the stopper supporting member positioned in the progressive
direction of the shadow mask while the interference prevention stopper 7 is
placed on the other stopper supporting member in the opposite direction
thereto.
The dust removal tape 3 has an end wound on a circular winding base
(not shown) mounted on a rotary roller 11 which is rotatably fixed on the base
frame 1. The dust removal tape 3 also has an opposing end wound on the
other winding base (not shown) mounted on a winding roller 13. The winding
roller 13 is spaced apart from the rotary roller 11 with a predetermined distance.
The width of the dust removal tape 3 is greater than that of a mask
portion of the shadow mask S. The dust removal tape 3 is a polyethylene tape and has a thickness of 0.05 mm, an adhesive force of 120g/25 mm, a tensional
strength of 0.8 kg/10 mm, a tensional rate of 300%, and a transparent color.
The tape guide unit includes two elevators 15 and 17 fixed on the base
frame 1. The elevators 15 and 17 includes guide cylinders 15a and 17a for
receiving air pressure from the external, and guide pistons 15b and 17b
connected to the guide cylinders 15a and 17a respectively to be raised or
lowered by the air pressure fed therefrom.
The guide cylinders 15a and 17a are arranged between the rotary roller
11 and the winding roller 13 parallel to each other. The distance between the
guide cylinders 15a and 17a should be at least longer than the longitudinal
length of the shadow mask S.
In addition, guide rollers 15c and 17c are vertically provided under the
guide pistons 15b and 17b respectively to guide the dust removal tape 3.
Guide members 15d and 17d are also provided at the bottom of the guide
pistons 15b and 17b to combine the guide pistons 15b and 17b with the guide
rollers 15c and 17c such that the guide rollers 15c and 17c can be rotated.
The dust removing tape 3 lengthened between the rotary roller 11 and
the winding roller 13 is arranged above the shadow mask S by the guidance of
the guide rollers 15c and 17c.
When air pressure is fed to the guide cylinders 15a and 17a so that the
guide pistons 15b and 17b descend, the dust removing tape 3 positioned above
the shadow mask S makes in contact with the exterior of the shadow mask S.
However, at this time, the dust removal tape 3 does not uniformly contact the overall surface of the shadow mask S because an air is remained on the
contact side or the dust removal tape 3 is unnecessarily lengthened between
the guide rollers 15c and 17c. This causes an unsatisfactory dust removal
operation with respect to the exterior of the shadow mask S.
Therefore, a pressure contact unit is provided between the guide
pistons 15b and 17b to secure the uniform contacting between the dust removal
tape 3 and the exterior of the shadow mask S. For that purpose, the pressure
contact unit spurts high-pressure air on the contact side between the dust
removal tape 3 and the shadow mask S.
The pressure contact unit includes two pressure cylinders 19 for
receiving air pressure from the external, pressure pistons 19a connected to the
pressure cylinders 19 respectively to be raised and lowered by the air pressure
fed therefrom, and an air feeder 19b fixed on the bottom of the pressure pistons
19a to spurt the high-pressure air on the dust removal tape 3 contacting the
shadow mask S.
Meanwhile, after the dust removing operation, the dust removal tape 3
should be detached from the shadow mask S and wound on the winding roller
13.
For that purpose, a motor 21 is connected to the winding roller 13.
The winding roller 13 is rotated by the motor 21 to wind the dust removal tape 3
thereon. Therefore, the contact side of the dust removing tape 3 with the
shadow mask S is continuously replaced by a new one so that deterioration in
the dust removal efficiency can be prevented. As described above, when the dust removal tape 3 is attached on or
detached from the shadow mask S by the tape guide unit and the pressure
contact unit, the shadow mask S should be fixed on the dust removal position
for a complete dust removing operation.
Therefore, a plurality of position fixation stoppers 23 is provided on the
conveyer frame 9 of the roller conveyer C. The position fixation stoppers 23
each are driven by an actuator (not shown) and pressurize the skirt of the
shadow mask S to immovably fix it.
Furthermore, a plurality of supporting rollers 25 are provided between
the rotary roller 11 and the guide roller 15c as well as between the winding
roller 13 and the other guide roller 17c. The supporting rollers 25 prevent the
dust removing tape 3 from being shaken or attached on other components
including the base frame 1.
The operation of the dust removing apparatus will be now described
with reference to Figs. 2a - 2c.
When a shadow mask S is fed to the dust removal position by the
guidance of the roller conveyer C, the regular position stopper 5 is operated to
correctly stop the shadow mask S on the dust removal position.
And the interference prevention stopper 7 is protruded backward the
shadow mask S and prevents it from interfering with a following shadow mask S.
As a result, the shadow mask S is not broken away from the dust removal
position. At this time, the position fixation stoppers 23 pressurize the shadow
mask S to immovably fix it.
Thereafter, air pressure is fed into the guide cylinders 15a and 17a and
hence, the guide pistons 15b and 17b movably connected to the guide
cylinders 15a and 17a descend toward the exterior of the shadow mask S.
Then, the guide rollers 15c and 17c connected to the guide pistons 15b
and 17b are operated to attach the dust removal tape 3 on the exterior of the
shadow mask S. Thereafter, air pressure is fed into the pressure cylinders 19
and hence, the pressure pistons 19a descend toward the shadow mask S.
At this time, the air feeder 19b fixed on the bottom of the pressure
pistons 19a is spaced apart from the dust removal tape 3 contacting the
shadow mask S with a predetermined distance.
The air feeder 19b spurts high-pressure air on the dust removal tape 3
to uniformly attach the dust removal tape 3 on the exterior of the shadow mask
S.
Some seconds later, the air pressure fed into the pressure cylinders 19
releases and therefore, the pressure pistons 19a and the air feeder 19b each
successively connected to the pressure cylinders 19 are elevated to thereby
return to the initial position.
When the pressure contact unit returns to the initial position, the air
pressure of the guide cylinder 17a positioned close to the winding roller 13 first
releases so that the guide piston 17b and the guide roller 17c are elevated. Then, the motor 21 rotates the winding roller 13 with a predetermined
angle to detach the dust removal tape 3 from the shadow mask S.
Subsequently, the air pressure of the other guide cylinder 15a positioned close
to the rotary roller 11 releases so that the guide piston 15b and the guide roller
15c are elevated to thereby return to the initial position.
As a result, the dust removal tape 3 passing through the dust removing
operation is detached from the shadow mask S and wound on the winding roller
13.
As described above, when the dust removal tape is detached from the
shadow mask, the pressure pistons 15b and 17b are separately elevated to
minimize the possibility that the shadow mask S is broken away from the dust
removal position due to the adhesive force operating between the dust removal
tape and the shadow mask.
When the dust removing operation is completed and hence, the dust
removal tape 3, the tape guide unit and the pressure contact unit return to the
initial position, the position fixation stoppers 23 release their pressurization onto
the shadow mask S and the regular position stopper and the interference
prevention stopper enter into the corresponding stopper supporting member.
Subsequently, the roller conveyer C delivers the dust-removed shadow
mask S to the next process and simultaneously feeds a new shadow mask S to
the dust removal position.
The dust removing operation can be continuously performed through
repeating the aforementioned steps. Fig. 3 is a perspective view of a dust removing apparatus for removing
dusts from the interior of a shadow mask according to a second preferred
embodiment of the present invention, Fig. 4 is a plan view of the dust removing
apparatus according to the second preferred embodiment, Fig. 5a is a front
view showing the initial state of the dust removing apparatus according to the
second preferred embodiment, Fig. 5b is a fragmentary sectional front view
showing the state of the dust removing apparatus in which a pipe is elevated
according to the second preferred embodiment, Fig. 5c is a fragmentary
sectional front view showing the state of the dust removing apparatus in which
a balloon is blown up and a dust removal tape is attached on the interior of the
shadow mask, and Fig. 5d is a fragmentary sectional front view showing the
state of the dust removing apparatus in which a pipe is lowered according to
the second preferred embodiment.
The dust removing apparatus for removing dusts from the interior of the
shadow mask S according to the second preferred embodiment includes a
shadow mask feeding and delivering unit for feeding the shadow mask S to a
dust removal position and delivering the dust-removed shadow mask S to a
next process, and an internal dust removing unit for removing the dusts
adhered on the interior of the shadow mask at the dust removal position.
In this second preferred embodiment, the shadow mask feeding and
delivering unit is also a roller conveyer C1 as is in the first preferred
embodiment, with the exception that the rollers provided on the dust removal
position are provided in-between conveyer frames 39 such that a space is formed therebetween to allow passage of the dust removing unit.
As is in the first preferred embodiment, the roller conveyer C1 is
provided with a regular position stopper 35, an interference prevention stopper
37 and position fixation stoppers 53.
The internal dust removing unit includes a dust removal tape 33 and a
tape attachment unit for guiding the dust removal tape 33 onto the interior of
the shadow mask S to attach it thereon or detach it therefrom. The dust
removal tape 33 is a polyethylene tape as is in the first preferred embodiment.
The tape attachment unit includes a balloon 45 positioned under the
shadow mask S.
The dust removal tape 33 has an end wound on a circular winding base
mounted on a rotary roller 41 which is installed between supporting members
39a on the one side. The dust removal tape 33 also has an opposing end
wound on the other winding base mounted on a winding roller 43 which is
installed between supporting members 39a on the other side.
The dust removal tape 33 lengthened between the rotary roller 41 and
the winding roller 43 is positioned between the shadow mask S and the balloon
45. The side of the dust removal tape 33 applied with adhesive materials
faces toward the shadow mask S.
In the meantime, a pipe 47 is connected to the bottom of the balloon 45.
The pipe is to feed air into the balloon 45 to inflate it while the pipe supports the
balloon 45. The balloon 45 inflates to uniformly attach the dust removal tape 33 on
the interior of the shadow mask S or deflates to detach it therefrom. The
upper portion of the inflated balloon 45 has the same curvature as the interior of
the shadow mask S.
The balloon 45 should be elevated toward the interior of the shadow
mask S to uniformly attach the dust removal tape 33 thereon. Thus, a lift 49 is
connected to the bottom of the pipe 47 to raise or lower the balloon 45 together
with the pipe 47.
A hose 49a is connected to one side of the lift 49 to feed high-pressure
air thereto. The lift 49 receives high-pressure air from the hose 49a to feed it
into the pipe 47 or to elevate the pipe 47.
A motor 51 is connected to the winding roller 43 to rotate it and thereby
detach the dust removal tape 33 from the interior of the shadow mask S.
The dust removing operation according to the second preferred
embodiment can be described as shown below.
When a shadow mask S is fed to the dust removal position by the
guidance of the conveyer frame 39, the regular position stopper 35 is protruded
to correctly stop the shadow mask S on the dust removal position and the
interference prevention stopper 37 is also protruded to prevent the shadow
mask S from interfering with a following shadow mask.
Furthermore, position fixation stoppers 53 provided on the conveyer
frame 39 pressurize the shadow mask S to immovably fix it on the dust removal
position. Thereafter, high-pressure air is fed into the lift 49 through the hose 49a
to elevate the pipe 47. Therefore, the balloon 45 fixed on the upper portion of
the pipe 47 is elevated together to attach the dust removal tape 33 on the
interior of the shadow mask S.
Then, the balloon 45 is inflated upon receipt of air from the lift 49
through the pipe 47 to uniformly attach the dust removal tape 33 on the interior
of the shadow mask S.
Some seconds later, the air fed into the balloon 45 is discharged
through the hose 49a and hence, the balloon 45 is deflated. At this time, the
pipe 47 descends to thereby return to the initial state.
However, at that state, the dust removal tape 33 may still be attached
on the interior of the shadow mask S due to adhesive force of the contact side.
Thus, the motor 51 rotates the winding roller 43 with a predetermined angle to
wind the dust removal tape 33 thereon. As a result, the dust removal tape 33
passing through the dust removing operation is entirely detached from the
interior of the shadow mask S.
When the dust removal tape 33 is detached from the interior of the
shadow mask S, the regular position stopper 35 and the interference prevention
stopper 37 enter into the stopper supporting members 39b respectively and the
position fixation stoppers 53 are separated from the shadow mask S.
Subsequently, the roller conveyer C1 delivers the dust-removed
shadow mask S to the next process, and feeds a new shadow mask S to the
dust removal position so that the dust removing operation described above can be continuously performed.
Fig. 6 is a perspective view showing a dust removal apparatus for
simultaneously removing dusts from the interior and exterior of a shadow mask
according to a third preferred embodiment of the present invention, Fig. 7a is a
front view showing the initial state of the dust removing apparatus according to
the third preferred embodiment, Fig. 7b is a front view showing the state of the
dust removing apparatus in which dust removal tapes are attached on the
interior and exterior of the shadow mask according to the third preferred
embodiment, Fig. 7c is a front view showing the state of the dust removing
apparatus in which the dust removal tapes are uniformly attached on the
interior and exterior of the shadow mask by the operation of an air feeder and a
balloon according to the third preferred embodiment, and Fig. 7d is a front view
showing the state of the dust removing apparatus in which the dust removal
tapes are detached from the interior and exterior of the shadow mask according
to the third preferred embodiment.
The dust removing apparatus for simultaneously removing dusts from
the interior and exterior of the shadow mask according to the third preferred
embodiment includes a shadow mask feeding and delivering unit for feeding
the shadow mask S to a dust removal position and delivering the dust-removed
shadow mask S to a next process, an external dust removing unit for removing
the dusts adhered to the exterior of the shadow mask at the dust removal
position, and an internal dust removing unit for removing the dusts adhered to
the interior of the shadow mask at the dust removal position. In this preferred embodiment, the shadow mask feeding and delivering
unit is also a roller conveyer C2 and provided with a regular position stopper 65,
an interference prevention stopper 67 and a plurality of position fixation
stoppers 93 as are in the previous preferred embodiments.
The external dust removing unit includes a base frame 61 positioned
above the roller conveyer C2, a first dust removal tape 63 having a contact side
applied with adhesive materials, a tape guide unit for guiding the first dust
removal tape 63 onto the exterior of the shadow mask S to attach it thereon or
to detach it therefrom.
The first dust removal tape 63 has an end wound on a circular winding
base mounted on a rotary roller 71 which is rotatably fixed on the base frame
61. The first dust removal tape 63 also has an opposing end wound on the
other winding base mounted on a winding roller 73. The winding roller 73 is
spaced apart from the rotary roller 71 with a predetermined distance.
The first dust removal tape 63 is a polyethylene tape as is in the first
preferred embodiment.
The tape guide unit includes two elevators 75 and 77 fixed on the base
frame 61. The elevators 75 and 77 include guide cylinders 75a and 77a for
receiving air pressure from the external, and guide pistons 75b and 77b
connected to the guide cylinders 75a and 77a respectively to be raised or
lowered by the air pressure fed therefrom.
The guide cylinders 75a and 77a is arranged between the rotary roller
71 and the winding roller 73 parallel to each other. The distance between the guide cylinders 75a and 77a should be at least longer than the longitudinal
length of the shadow mask S.
In addition, guide rollers 75c and 77c are vertically provided under the
guide pistons 75b and 77b respectively to guide the first dust removal tape 63.
Guide members 75d and 77d are also provided at the bottom of the guide
pistons 75b and 77b to combine the guide pistons 75b and 77b with the guide
rollers 75c and 77c such that the guide rollers 75c and 77c can be rotated.
The first dust removing tape 63 lengthened between the rotary roller 71
and the winding roller 73 is arranged above the shadow mask S by the
guidance of the guide rollers 75c and 77c.
When air pressure is fed into the guide cylinders 75a and 77a so that
the guide pistons 75b and 77b descend, the first dust removing tape 63
positioned above the shadow mask S makes in contact with the exterior of the
shadow mask S. However, at this time, the first dust removal tape 63 does not
uniformly contact the overall surface of the shadow mask S because an air is
remained on the contact side or the first dust removal tape 63 is unnecessarily
lengthened between the guide rollers 75c and 77c. This causes an
unsatisfactory dust removal operation with respect to the exterior of the shadow
mask S.
Therefore, a pressure contact unit is provided between the guide
pistons 75b and 77b to secure the uniform contacting between the first dust
removal tape 63 and the exterior of the shadow mask S. For that purpose, the
pressure contact unit spurts high-pressure air on the contact side between the first dust removal tape 63 and the shadow mask S.
The pressure contact unit includes two pressure cylinders 79 for
receiving air pressure from the external, pressure pistons 79a movably
connected to the pressure cylinders 79 respectively to be raised and lowered
by the air pressure fed therefrom, and an air feeder 79b fixed on the bottom of
the pressure pistons 79a to spurt high-pressure air on the first dust removal
tape 63 contacting the shadow mask S.
Meanwhile, after the dust removing operation, the first dust removal
tape 63 should be detached from the shadow mask S and wound on the
winding roller 73.
For that purpose, a motor 80 is connected to the winding roller 73.
The winding roller 73 is rotated by the motor 21 to wind the first dust removal
tape 63 thereon. Therefore, the contact side of the first dust removal tape 63
is continuously replaced by a new one so that deterioration in the dust removal
efficiency can be prevented.
Furthermore, a plurality of supporting rollers 85 are provided between
the rotary roller 71 and the guide roller 75c as well as between the winding
roller 73 and the other guide roller 77c. The supporting rollers 85 prevent the
first dust removing tape 63 from being shaken or attached on other components
including the base frame 61.
The internal dust removing unit includes a second dust removal tape 63
and a tape attachment unit for guiding the second dust removal tape 63 onto
the interior of the shadow mask S to attach thereon or detach therefrom. The tape attachment unit includes a balloon 85 positioned under the
shadow mask S.
The second dust removal tape 63 has an end wound on a circular
winding base mounted on a rotary roller 81 which is installed between
supporting members 99 on the one side. The second dust removal tape 63
also has an opposing end wound on the other winding base mounted on a
winding roller 83 which is installed between supporting members 99 on the
other side.
The second dust removal tape 63 lengthened between the rotary roller
81 and the winding roller 83 is positioned between the shadow mask S and the
balloon 85. The contact side of the second dust removal tape 63 applied with
adhesive materials faces the shadow mask S.
In the meantime, a pipe 87 is connected to the bottom of the balloon 85.
The pipe is to feed air into the balloon 85 to inflate it while the pipe supports the
balloon 85.
The balloon 85 inflate to uniformly attach the second dust removal tape
63 on the interior of the shadow mask S or deflates to detach it therefrom.
The upper portion of the inflated balloon 85 has the same curvature as the
interior of the shadow mask S.
The balloon 85 should be elevated toward the interior of the shadow
mask S to uniformly attach the second dust removal tape 63 thereon. Thus, a
lift 89 is connected to the bottom of the pipe 87 to elevate the balloon 85
together with the pipe 87. The lift 89 receives high-pressure air from the external to feed it into the
pipe 87 or raise the pipe 87.
A motor 90 is connected to the winding roller 83 to rotate it and thereby
detach the second dust removal tape 63 from the interior of the shadow mask S.
The dust removing operation according to the third preferred
embodiment can be described as shown below.
When a shadow mask S is fed to the dust removal position by the
guidance of the conveyer frame 69, the regular position stopper 65 is protruded
to correctly stop the shadow mask S on the dust removal position and the
interference prevention stopper 67 is also protruded to prevent the shadow
mask S from interfering with a following shadow mask.
Furthermore, the position fixation stoppers 93 placed on the conveyer
frame 69 pressurize the shadow mask S to immovably fix it on the dust removal
position.
Thereafter, air pressure is fed into the guide cylinders 75a and 77a and
hence, the guide pistons 75b and 77b movably connected to the guide
cylinders 75a and 77a descend toward the exterior of the shadow mask S.
Then, the guide rollers 75c and 77c connected to the guide pistons 75b
and 77b are operated to attach the first dust removal tape 63 on the exterior of
the shadow mask S. Thereafter, an air pressure is fed into the pressure
cylinders 79 and hence, the pressure pistons 79a descend toward the shadow
mask S. At this time, the air feeder 79b fixed on the bottom of the pressure
pistons 79a is spaced apart from the first dust removal tape 63 contacting the
shadow mask S with a predetermined distance.
The air feeder 79b spurts high-pressure air on the first dust removal
tape 63 to uniformly attach it on the exterior of the shadow mask S.
Some seconds later, the air pressure fed into the pressure cylinders 79
releases and therefore, the pressure pistons 79a and the air feeder 79b
successively connected to the pressure cylinders 79 are elevated to thereby
return to the initial position.
When the pressure contact unit returns to the initial position, the air
pressure of the guide cylinder 77a positioned close to the winding roller 73 first
releases so that the guide piston 77b and the guide roller 77c are elevated.
Then, the motor 80 rotates the winding roller 73 with a predetermined
angle to detach the first dust removal tape 63 from the shadow mask S.
Subsequently, the air pressure of the other guide cylinder 75a positioned close
to the rotary roller 71 releases so that the guide piston 75b and the guide roller
75c are elevated to thereby return to the initial position.
As a result, the first dust removal tape 63 passing through the dust
removing operation is detached from the shadow mask S and wound on the
winding roller 73.
As described above, when the first dust removal tape 63 is detached
from the exterior of the shadow mask S, the pressure pistons 75b and 77b are
separately elevated to minimize the possibility that the shadow mask S is broken away from the dust removal position due to the adhesive force
operating between the first dust removal tape and the shadow mask.
In the meantime, the dust removing operation with respect to the
interior of the shadow mask S is performed simultaneously with the dust
removing operation with respect to the exterior of the shadow mask S.
When the shadow mask S is fixed on the dust removal position, high-
pressure air is fed into the lift 89 from the external to raise the pipe 87.
Therefore, the balloon 85 fixed on the upper portion of the pipe 87 is elevated
together to attach the second dust removal tape 63 on the interior of the
shadow mask S.
Then, the balloon 85 is inflated upon receipt of air from the lift 89
through the pipe 87 to uniformly attach the second dust removal tape 63 on the
interior of the shadow mask S.
Some seconds later, the air fed into the balloon 85 is discharged
through the pipe 87 and hence, the balloon 85 is deflated. At this time, the
pipe 87 descends to thereby return to the initial state.
However, at that state, the second dust removal tape 63 may still be
attached on the interior of the shadow mask S due to adhesive force of the
contact side. Thus, the motor 90 rotates the winding roller 83 with a
predetermined angle to wind the second dust removal tape 63 thereon. As a
result, the second dust removal tape 63 passing through the dust removing
operation is entirely detached from the interior of the shadow mask S. When the dust removing operation with respect to the interior and
exterior of the shadow mask S is completed, the position fixation stoppers 93
are separated from the shadow mask S and the regular position stopper 65 and
the interference prevention stopper 67 enter into the stopper supporting
members 66 respectively.
Subsequently, the roller conveyer C2 delivers the dust-removed
shadow mask S to the next process, and feeds a new shadow mask to the dust
removal position so that the dust removing operation described above can be
continuously performed.
As described above, in the inventive method and apparatus for
removing dusts from the shadow mask, the dusts adhered to the shadow mask
are rapidly removed so that cleanness of the shadow mask can be constantly
kept. Furthermore, it is installed at a low cost and narrow space and thus,
several devices can be simultaneously provided to remove the dusts adhered
to the shadow mask in the course of the shadow mask processing. In addition,
the beam-guide aperture clogging defect can be removed owing to rapid and
effective removal of the dusts from the shadow mask.
It will be apparent to those skilled in the art that various modifications
and variations can be made in the dust removing apparatus for the shadow
mask of the present invention without departing from the spirit or scope of the
invention. Thus, it is intended that the present invention cover modifications
and variations of this invention provided they come within the scope of the
appended claims and their equivalents.

Claims

WHAT IS CLAIMED IS:
1. A method of removing dusts from a shadow mask, the method
comprising the steps of:
feeding the shadow mask to a dust removal position;
removing dusts adhered on the shadow mask at the dust removal
position by using a dust removal tape for adhering the dusts; and
delivering the dust-removed shadow mask to a next process.
2. An apparatus for removing dusts from the shadow mask, the
dust removing apparatus comprising:
a shadow mask feeding and delivering unit for feeding the shadow
mask to a dust removal position and delivering the dust-removed shadow mask
to a next process; and
a dust removing unit for removing dusts adhered on the shadow mask
at the dust removal position by using a dust removal tape for adhering the dusts.
3. An apparatus for removing dusts from the exterior of a shadow
mask, the dust removing apparatus comprising:
a shadow mask feeding and delivering unit for feeding the shadow
mask to a dust removal position and delivering the dust-removed shadow mask
to a next process; and
an external dust removing unit for removing the dusts adhered to the
exterior of the shadow mask at the dust removal position by using a dust
removal tape for adhering the dusts.
4. The dust removing apparatus of claim 3, wherein the shadow
mask feeding and delivering unit comprises a roller conveyer.
5. The dust removing apparatus of claim 4, wherein the roller
conveyer is provided with a regular position stopper for stopping the shadow
mask on the dust removal position.
6. The dust removing apparatus of claim 4, wherein the roller
conveyer is provided with an interference prevention stopper for preventing the
shadow mask fixed on the dust removal position from interfering with a
following shadow mask.
7. The dust removing apparatus of claim 3, wherein the external
dust removing unit comprises a base frame positioned above the roller
conveyer, rotary and winding rollers each rotatably fixed on the base frame, the
dust removal tape having an end wound on the rotary roller, an opposing end
wound on the winding roller and a contact side applied with adhesive materials,
and a tape guide unit for guiding the contact side of the dust removal tape onto
the exterior of the shadow mask to attach it thereon or to detach it therefrom.
8. The dust removing apparatus of claim 7, wherein the tape
guide unit comprises a plurality of elevators installed on the base frame to
attach the dust removal tape on the exterior of the shadow mask, and a motor
for rotating the winding roller with a predetermined angle to thereby detach the
dust removal tape from the exterior of the shadow mask.
9. The dust removing apparatus of claim 8, wherein the elevators
comprises a plurality of guide cylinders, guide pistons movably connected to the guide cylinders respectively, guide members provided at the bottom of the
guide pistons, and guide rollers placed under the guide members, the guide
rollers being combined with the guide pistons by the guide members such that
the guide rollers can be rotated.
10. The dust removing apparatus of claim 9, wherein the guide
cylinders elevate the guide pistons using air pressure.
11. The dust removing apparatus of claim 7, further comprising a
pressure contact unit for uniformly attaching the dust removal tape on the
exterior of the shadow mask.
12. The dust removing apparatus of claim 11 , wherein the pressure
contact unit comprises a plurality of pressure cylinders fixed on the base frame,
pressure pistons movably connected to the pressure cylinders respectively, and
an air feeder fixed on the bottom of the pressure pistons to spurt high-pressure
air on the dust removal tape attached on the exterior of the shadow mask.
13. The dust removing apparatus of claim 12, wherein the pressure
cylinders elevate the pressure pistons using air pressure.
14. The dust removing apparatus of claim 7, wherein the base
frame is provided with a plurality of supporting rollers for preventing the dust
removal tape from being shaken or attached on other components during the
dust removing operation.
15. The dust removing apparatus of claim 4, wherein the roller
conveyer is provided with a plurality of position fixation stoppers for immovably
fixing the shadow mask on the dust removal position.
16. An apparatus for removing dusts from the interior of a shadow
mask, the dust removing apparatus comprising a shadow mask feeding and
delivering unit for feeding the shadow mask on a dust removal position and
delivering the dust-removed shadow mask to a next process, and an internal
dust removing unit for removing the dusts adhered on the interior of the shadow
mask by using a dust removal tape for adhering the dusts.
17. The dust removing apparatus of claim 16, wherein the shadow
mask feeding and delivering unit comprises a roller conveyer having a space for
allowing passage of the shadow mask therein.
18. The dust removing apparatus of claim 17, wherein the roller
conveyer is provided with a regular position stopper for stopping the shadow
mask on the regular position.
19. The dust removing apparatus of claim 17, wherein the roller
conveyer is provided with an interference prevention stopper for preventing the
shadow mask fixed on the dust removal position from interfering with a
following shadow mask.
20. The dust removing apparatus of claim 17, wherein the roller
conveyer is provided with a plurality of position fixation stoppers for immovably
fixing the shadow mask on the dust removal position.
21. The dust removing apparatus of claim 16, wherein the internal
dust removing unit comprises supporting members installed on both sides of
the roller conveyer to support it, rotary and winding rollers positioned between
the supporting members, a dust removal tape having an end wound on the rotary roller, an opposing end wound on the winding roller and a contact side
applied with adhesive materials, a tape attachment unit for guiding the dust
removal tape onto the interior of the shadow mask to attach thereon or to
detach therefrom.
22. The dust removing apparatus of claim 20, wherein the tape
attachment unit comprises a balloon positioned under the shadow mask, a pipe
fixed on the bottom of the balloon to support the balloon as well as to feed air
into the inner space of the balloon, a lift connected to the bottom of the pipe to
elevate the pipe, and a motor connected to the winding roller to rotate it and
thereby detach the dust removal tape from the interior of the shadow mask.
23. The dust removing apparatus of claim 22, wherein the lift
elevate the pipe using air pressure.
24. The dust removing apparatus of claim 22, wherein the upper
portion of the balloon has a curvature identical with the interior of the shadow
mask when it is blown up.
25. A dust removing apparatus for removing dusts from the interior
and exterior of a shadow mask, the dust removing apparatus comprising a
shadow mask feeding and delivering unit for feeding the shadow mask on a
dust removal position and delivering the dust-removed shadow mask to a next
process, an external dust removing unit for removing the dusts adhered on the
exterior of the shadow mask at the dust removal position by using a first dust
removal tape for adhering the dusts, and an internal dust removing unit for
removing the dusts adhered on the interior of the shadow mask at the dust removal position by using a second dust removal tape for adhering the dusts.
26. The dust removing apparatus of claim 25, wherein the shadow
mask feeding and delivering unit comprises a roller conveyer having a space for
allowing passage of the shadow mask therein.
27. The dust removing apparatus of claim 26, wherein the roller
conveyer is provided with a regular position stopper for stopping the shadow
mask on the dust removal position.
28. The dust removing apparatus of claim 26, wherein the roller
conveyer is provided with an interference prevention stopper for preventing the
shadow mask fixed on the dust removal position from interfering with a
following shadow mask.
29. The dust removing apparatus of claim 26, wherein the roller
conveyer is provided with a plurality of position fixation stoppers for immovably
fixing the shadow mask on the dust removal position.
30. The dust removing apparatus of claim 25, wherein the external
dust removing unit comprises a base frame positioned above the roller
conveyer, first rotary and winding rollers each rotatably fixed on the base frame,
the first dust removal tape having an end wound on the first rotary roller, an
opposing end wound on the first winding roller, a contact side applied with
adhesive materials, and a tape guide unit for guiding the contact side of the first
dust removal tape onto the exterior of the shadow mask to attach it thereon or
to detach it therefrom.
31. The dust removing apparatus of claim 30, wherein the tape
guide unit comprises a plurality of elevators provided on the base frame to
attach the first dust removal tape on the exterior of the shadow mask, and a
first motor for rotating the first winding roller with a predetermined angle to
thereby detach the first dust removal tape from the exterior of the shadow mask.
32. The dust removing apparatus of claim 31 , wherein the elevators
comprises a plurality of guide cylinders, guide pistons movably connected to the
guide cylinders respectively, guide members provided at the bottom of the
guide pistons, and guide rollers placed under the guide members, the guide
rollers being combined with the guide pistons by the guide members such that
the guide rollers can be rotated.
33. The dust removing apparatus of claim 32, wherein the guide
cylinders elevate the guide pistons using air pressure.
34. The dust removing apparatus of claim 30, further comprising a
pressure contact unit for uniformly attaching the first dust removal tape on the
exterior of the shadow mask.
35. The dust removing apparatus of claim 34, wherein the pressure
contact unit comprises a plurality of pressure cylinders fixed on the base frame,
pressure pistons movably connected to the pressure cylinders respectively, and
an air feeder fixed on the bottom of the pressure pistons to spurt high-pressure
air on the first dust removal tape attached on the exterior of the shadow mask.
36. The dust removing apparatus of claim 35, wherein the pressure
cylinders elevate the pressure pistons using an air pressure.
37. The dust removing apparatus of claim 30, wherein the base
frame is provided with a plurality of supporting rollers for preventing the first
dust removal tape wound on the first rotary and winding rollers from being
shaken or adhered on other components during the dust removing operation.
38. The dust removing apparatus of claim 25, wherein the internal
dust removing unit comprises supporting members installed on both sides of
the roller conveyer to support it, second rotary and winding rollers positioned
between the supporting members, the second dust removal tape having an end
wound on the second rotary roller, an opposing end wound on the second
winding roller and a contact side applied with adhesive materials, and a tape
attachment unit for guiding the second dust removal tape onto the interior of the
shadow mask to attach it thereon or to detach it therefrom.
39. The dust removing apparatus of claim 38, wherein the tape
attachment unit comprises a balloon positioned under the shadow mask, a pipe
fixed on the bottom of the balloon to support the balloon as well as to feed air
into the inner space of the balloon, a lift connected to the bottom of the pipe to
elevate the pipe, and a second motor connected to the winding roller to rotate it
and thereby detach the dust removal tape from the interior of the shadow mask.
40. The dust removing apparatus of claim 39, wherein the lift
elevates the pipe using air pressure.
41. The dust removing apparatus of claim 39, wherein the balloon
has an upper portion having a curvature identical with the shadow mask when it
is blown up.
EP97950454A 1996-12-30 1997-12-29 Method and apparatus for removing dust from shadow mask Withdrawn EP0895649A1 (en)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
KR2019960064424U KR200149630Y1 (en) 1996-12-30 1996-12-30 Cleaning apparatus of shadowmask for color crt
KR9664424 1996-12-30
KR9728477 1997-06-27
KR9728478 1997-06-27
KR1019970028478A KR19990004387A (en) 1997-06-27 1997-06-27 Shadow Mask Vibration Device for Cathode Ray Tube
KR1019970028477A KR19990004386A (en) 1997-06-27 1997-06-27 Shadow Mask Vibration Device for Cathode Ray Tube
PCT/KR1997/000280 WO1998029892A1 (en) 1996-12-30 1997-12-29 Method and apparatus for removing dust from shadow mask

Publications (1)

Publication Number Publication Date
EP0895649A1 true EP0895649A1 (en) 1999-02-10

Family

ID=27349441

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97950454A Withdrawn EP0895649A1 (en) 1996-12-30 1997-12-29 Method and apparatus for removing dust from shadow mask

Country Status (6)

Country Link
EP (1) EP0895649A1 (en)
JP (1) JP2000507385A (en)
CN (1) CN1214795A (en)
AU (1) AU5344598A (en)
BR (1) BR9709156A (en)
WO (1) WO1998029892A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101002001B1 (en) * 2004-02-02 2010-12-16 엘지디스플레이 주식회사 Apparatus for removing particle on a mask
CN109454968B (en) * 2018-12-21 2024-03-01 浙江爱漫时智能家居有限公司 Wall cloth compounding machine
CN111959864A (en) * 2020-07-31 2020-11-20 昆山铭世特精密机械有限公司 Film pasting device for convex curved screen
CN115069684B (en) * 2022-07-21 2022-10-28 山东睿芯半导体科技有限公司 Automatic dust collecting equipment of chip
CN115652603B (en) * 2022-09-23 2023-09-01 南通如日纺织有限公司 Coating device for coating cloth production
CN115958304B (en) * 2022-11-30 2024-01-30 江苏瑞普森电路科技有限公司 Integrated circuit marking dust collector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0246622A (en) * 1988-08-06 1990-02-16 Mitsubishi Electric Corp Manufacture of color cathode-ray tube

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9829892A1 *

Also Published As

Publication number Publication date
AU5344598A (en) 1998-07-31
BR9709156A (en) 1999-08-03
JP2000507385A (en) 2000-06-13
CN1214795A (en) 1999-04-21
WO1998029892A1 (en) 1998-07-09

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