EP0503513A1 - Apparatus for mounting shadow mask in color picture tube - Google Patents

Apparatus for mounting shadow mask in color picture tube Download PDF

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Publication number
EP0503513A1
EP0503513A1 EP92103922A EP92103922A EP0503513A1 EP 0503513 A1 EP0503513 A1 EP 0503513A1 EP 92103922 A EP92103922 A EP 92103922A EP 92103922 A EP92103922 A EP 92103922A EP 0503513 A1 EP0503513 A1 EP 0503513A1
Authority
EP
European Patent Office
Prior art keywords
mounting
shadow mask
panel
screen panel
color picture
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Withdrawn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
EP92103922A
Other languages
German (de)
English (en)
French (fr)
Inventor
Ho Seog Seo
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.)
LG Electronics Inc
Original Assignee
Gold Star 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
Application filed by Gold Star Co Ltd filed Critical Gold Star Co Ltd
Publication of EP0503513A1 publication Critical patent/EP0503513A1/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes

Definitions

  • the present invention generally relates to an apparatus for mounting a shadow mask in a shadow mask type color picture tube, and more particularly to such apparatus for mounting the shadow mask in which, when the shadow mask is mounted with respect to a screen panel of the shadow mask type color picture tube, the apparatus makes the shadow mask be parallel to an inner surface of the screen panel, thereby preventing the shadow mask from damaging a fluorescent coating on the screen panel and also facilitating the mounting work of the shadow mask.
  • known shadow mask type color picture tubes include a screen panel 10, a funnel 20 and a neck part 30, as shown in FIG. 1 which shows a construction of a representative embodiment of the known shadow mask type color picture tubes.
  • An electron gun 40 is installed in the neck part 30 in order to scan an electron beam onto a shadow mask 50 which is mounted with respect to an inner surface of the panel 10 so as to provide a predetermined space therebetween.
  • the shadow mask 50 allows the color lights to be selectively passed therethrough.
  • the shadow mask 50 generally includes a shadow mask effective part 51 and a shadow mask skirt 52 as shown in FIG. 2.
  • the effective part 51 is provided with a great number of minute holes (generally, about 330,000 holes are formed) for allowing the electron beams to be selectively passed therethrough, while the skirt 52 is formed as backwardly and nearly perpendicularly bending the peripheral part of the shadow mask 50 except for the effective part 51.
  • the shadow mask mounting apparatus generally includes a mounting frame 60 to which the shadow mask skirt 52 is tightly attached, thereby causing the shadow mask 50 to be supported and thus stably mounted on its position in the color picture tube.
  • a plurality of mounting pieces 70 are provided on corners of the mounting frame 60, respectively, in order to allow the shadow mask 50 to be mounted with respect to the screen panel 10 such that it faces the inner surface of the panel 10 with a predetermined space therebetween.
  • the mounting apparatus includes a plurality of panel pins 12 which are formed as inwardly protruding from the corners of a panel skirt 11 of the screen panel 10. the panel pins 12 are inserted into fixing holes 80 formed on the mounting pieces 70, respectively, thereby causing the shadow mask 50 to be mounted on the predetermined position with respect to the screen panel 10.
  • the mounting pieces 70 of the mounting frame 60 provided with the shadow mask 50 are forcedly deformed by the inward force F as described in the drawing, then the mounting frame 60 is forced so as to advance toward the inner surface of the screen panel 10 until the fixing holes 80 of the mounting pieces 70 are aligned with the panel pins 12 protruding from the four corners of the panel skirt 11, respectively.
  • the panel pins 12 of the panel skirts 11 are naturally inserted into the fixing holes 80 of the mounting pieces 70 owing to an elastic restoring force resulting from removing the inward force F so that the shadow mask 50 is mounted on the screen panel 10 with the predetermined space provided between the shadow mask 50 and the inner surface of the screen panel 10.
  • the fixing holes 80 formed on the mounting pieces 70 and the panel pins 12 formed as protruding from the panel skirt 11 are formed at four corners of the mounting frame 60 and the panel skirt 11, respectively. Therefore, the mounting frame 60 will be accurately mounted with respect to the screen panel 10 when the inward force F is removed under the condition that each fixing hole 80 of the mounting pieces 70 is accurately aligned with each corresponding panel pin 12 of the panel skirt 11.
  • the mounting frame 60 of the mounting apparatus should be inserted toward the inner surface of the screen panel 10 such that an assumed plane, represented at the line A-A in FIG.
  • the mounting frame 60 when the mounting frame 60 is inserted toward the screen panel 10 in order to mount the shadow mask 50 on the predetermined position in the color picture tube, the mounting frame 60 should be inserted toward the screen panel 10 under the condition that the mounting pieces 70 are manually forced in order to provide the inward force F, respectively, thereby causing the conventional mounting process of the shadow mask to require a substantial time and also reducing the productivity.
  • an object of the present invention to provide an apparatus for mounting a shadow mask of a shadow mask type color picture tube which, when the shadow mask is mounted in the color picture tube, efficiently prevents the shadow mask from damaging the fluorescent coating on an inner surface of a screen panel, facilitates the mounting work such that the working time can be reduced and thus improves the productivity.
  • an apparatus for mounting a shadow mask in a color picture tube including a mounting frame for supporting the shadow mask, the frame being integrally connected to a skirt of the shadow mask, a plurality of mounting pieces for mounting the shadow mask with respect to an inner surface of a screen panel of the color picture tube with provision of a predetermined space between the inner surface of the screen panel and the shadow mask, each of the pieces being attached to the mounting frame and having a fixing hole, a plurality of panel pins each for engaging with each fixing hole of the mounting piece, the panel pins being provided on an inner surface of a panel skirt of the screen panel, and positioning member for guiding the panel pins to be accruately aligned with the fixing holes so as to be inserted thereinto, the positioning member being integrally provided to the mounting pieces.
  • the positioning member includes a plurality of positioning pins each of which is attached to a mounting part of the mounting piece at a position closely under the fixing hole in order to contact with the panel pin as the mounting part advances toward the screen panel, thereby causing the fixing hole to be aligned with the panel pin and inserted thereinto without advancing over a position of the panel pin.
  • the apparatus includes a mounting frame 60 which is attached to a shadow mask skirt 52 of a shadow mask 50 in order to support the shadow mask 50.
  • a plurality of mounting pieces, preferably four mounting pieces 70, are provided on four corners of the mounting frame 60, respectively, in order to allow the shadow mask 50 to be mounted with respect to a screen panel 10 such that the shadow mask 50 is disposed with respect to the inner surface of the panel 10 with provision of a predetermined space therebetween.
  • the mounting apparatus includes a plurality of panel pins, preferably four panel pins 12, each of which is formed as protruding from each corner of panel skirt 11 of the screen panel 10.
  • the panel pins 12 are to be inserted into fixing holes 80 formed on the mounting pieces 70, respectively, thereby causing the shadow mask 50 to be mounted on the screen panel 10.
  • a plurality of positioning pins 74 are secured to the mounting pieces 70 by welding or riveting, respectively, and are adapted to guide the panel pins 12 of the panel skirt 11 to be accurately aligned with the fixing holes 80 of the mounting pieces 70, thereby causing the panel pins 12 to be accurately inserted into the fixing holes 80.
  • Each mounting piece 70 integrally includes an attaching part 71 for being attached to the mounting frame 60, an inclined part 72 for providing a resilient force acting from the shadow mask 50 toward the panel skirt 11 and a mounting part 73 having the fixing hole 80 into which the panel pin 12 of the panel skirt 11 is inserted.
  • the mounting piece 70 includes the positioning pin 74 which is fixed to the mounting part 73 by welding or riveting so as to be disposed closely under the fixing hole 80.
  • the positioning pins 74 each is adapted to prevent the mounting part 73 of the mounting piece 70 from advancing over the panel pin 12 as the mounting piece 70 moves toward the screen panel 10, thereby causing the panel pin 12 to be accurately inserted into the fixing hole 80 of the mounting part 73.
  • the mounting frame 60 is first attached to the skirt 52 of the shadow mask 50, then four positioning pins 74 are fixed to the mounting pieces 70 so as to be closely disposed under the fixing holes 80 of the mounting pieces 70, respectively. Thereafter, each mounting piece 70 is secured to the mounting frame 60 so as to be disposed at each corner of the shadow mask 50, thereby producing a shadow mask structure. Sequentially, the shadow mask structure is forced so as to be inserted inside the screen panel 10, thereby accomplishing the mounting of the shadow mask with respect to the color picture tube.
  • the shadow mask structure is gradually forced by an outside force Fo so as to be inserted toward the inner surface of the screen panel 10 under the condition that an effective plane 51 of the shadow mask 50 is approximately parallel to the inner surface of the screen panel 10.
  • each inclined part 72 of the mounting piece 70 is elastically inwardly deformed.
  • each fixing hole 80 of the mounting piece 70 is last aligned with each corresponding panel pin 12 of the panel skirt 11.
  • the panel pins 12 are elastically inserted into the fixing holes 80, respectively.
  • the pressure having acted on the mounting pieces 70 by the panel pins 12 is removed so that the mounting pieces 70 are restored to the original shape by the elastic restoring force. In result, it is accomplished to mount the shadow mask structure in a predetermined position with respect to the screen panel 10.
  • each panel pin 12 contacts with the corresponding positioning pin 74 which is provided to the mounting part 73 of the mounting piece 70 at a position closely under the fixing hole 80, respectively, so as to be prevented from advancing over the fixing hole 80.
  • the panel pins 12 are obliged to contact with the positioning pins 74 of the mounting pieces 70, respectively, so that they are accurately inserted into the fixing holes 80 without passing by the fixing holes 80.
  • the shadow mask mounting apparatus of this invention includes the positioning pins 74 each of which is in contact with the panel pin 12 during the shadow mask structure advances toward the inner surface of the screen panel 10 by being forced by the outside force Fo, the mounting apparatus of this invention assures that the panel pin 12 is accurately aligned with the fixing hole 80 so as to be inserted thereinto.
  • the shadow mask structure including the mounting apparatus of this invention is forced by the outside force in order to advance toward the inner surface of the screen panel 10 under the condition that the shadow mask structure is disposed with respect to the screen panel 10 such that the corners thereof are coresponding to the corners of the screen panel 10 without forced deforming of the mounting pieces 70 differently from the prior art
  • the fixing holes 80 of the mounting pieces 70 are accurately and naturally aligned with the panel pins 12 due to the contact of the panel pins 12 with the positioning pins 74.
  • the panel pins 12 are inserted into the fixing holes 80 by the elastic restoring force, respectively, thereby accomplishing the stable mounting of the shadow mask on the predetermined position in the color picture tube.
  • the shadow mask mounting apparatus is characteristically provided with the positioning pins each of which is secured to the mounting part of the mounting piece closely under the fixing hole and adapted to contact with the corresponding panel pin of the panel skirt of the screen panel when the shadow mask structure including the shadow mask and the mounting apparatus advances toward the inner surface of the screen panel of the color picture tube.
  • the mounting apparatus of this invention prevents the shadow mask from advancing over the predetermined mounting position when the shadow mask is mounted in the color picture tube so that it provides an advantage in that it efficiently prevents the shadow mask from damaging the fluorescent coating on the screen panel.
  • the apparatus of this invention provides another advantage in that it is not required to forcedly deform the mounting pieces of the mounting frame, thereby facilitating the mounting work of the shadow mask, thus reducing the working time.
  • the apparatus of this invention provides still another advantage in that the mounting pieces are not required to be forcedly deformed, as described above, thereby causing the mounting pieces to be easily restored without any deformation, thus improving the reliability.

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)
  • Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
EP92103922A 1991-03-15 1992-03-07 Apparatus for mounting shadow mask in color picture tube Withdrawn EP0503513A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR345591 1991-03-15
KR910003455 1991-03-15

Publications (1)

Publication Number Publication Date
EP0503513A1 true EP0503513A1 (en) 1992-09-16

Family

ID=31713050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92103922A Withdrawn EP0503513A1 (en) 1991-03-15 1992-03-07 Apparatus for mounting shadow mask in color picture tube

Country Status (4)

Country Link
EP (1) EP0503513A1 (ja)
JP (1) JPH04127949U (ja)
KR (1) KR950000197Y1 (ja)
CN (1) CN1064965A (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100337885B1 (ko) * 1999-11-29 2002-05-23 김순택 평면형 음극선관의 텐션형 섀도우마스크 조립체

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355893A1 (en) * 1988-08-04 1990-02-28 Koninklijke Philips Electronics N.V. Method of manufacturing a colour display tube

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS525518B2 (ja) * 1973-10-15 1977-02-14
KR900004258B1 (ko) * 1987-01-27 1990-06-18 가부시끼가이샤 도시바 칼라수상관

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0355893A1 (en) * 1988-08-04 1990-02-28 Koninklijke Philips Electronics N.V. Method of manufacturing a colour display tube

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 4, no. 162 (E-33)(644) 12 November 1980 & JP-A-55 109 344 ( TOKYO SHIBAURA DENKI K.K. ) 22 August 1980 *

Also Published As

Publication number Publication date
CN1064965A (zh) 1992-09-30
JPH04127949U (ja) 1992-11-20
KR920018664U (ko) 1992-10-19
KR950000197Y1 (ko) 1995-01-12

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