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)

Applications Claiming Priority (7)

Publications (1)

Family

ID=27349441

Family Applications (1)

Country Status (6)

Families Citing this family (6)

Family Cites Families (1)

• 1997
  • 1997-12-29 CN CN 97193283 patent/CN1214795A/zh active Pending
  • 1997-12-29 EP EP97950454A patent/EP0895649A1/en not_active Withdrawn
  • 1997-12-29 BR BR9709156A patent/BR9709156A/pt unknown
  • 1997-12-29 WO PCT/KR1997/000280 patent/WO1998029892A1/en not_active Application Discontinuation
  • 1997-12-29 AU AU53445/98A patent/AU5344598A/en not_active Abandoned
  • 1997-12-29 JP JP10529888A patent/JP2000507385A/ja active Pending

Non-Patent Citations (1)

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