US3487251A - Parallelogram mounting fixture for shadow mask - Google Patents

Parallelogram mounting fixture for shadow mask Download PDF

Info

Publication number
US3487251A
US3487251A US682945A US3487251DA US3487251A US 3487251 A US3487251 A US 3487251A US 682945 A US682945 A US 682945A US 3487251D A US3487251D A US 3487251DA US 3487251 A US3487251 A US 3487251A
Authority
US
United States
Prior art keywords
shadow mask
strips
mask
tube
strip
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.)
Expired - Lifetime
Application number
US682945A
Other languages
English (en)
Inventor
Piet Gerard Joseph Barten
Hans Helmut Schulte
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.)
US Philips Corp
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3487251A publication Critical patent/US3487251A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes

Definitions

  • the invention relates to a cathode-ray tube for displaying colored television images, in which a substantially rectangular color selection electrode is arranged in the proximity of the display screen and is supported in the tube by means of at least three preferably strip-shaped supporting members which are each secured at one end to the periphery of the color selection electrode and are supported at the other end by a supporting point in the tube wall.
  • the invention particularly relates to the construction of the supporting members for the color selection electrode.
  • such supporting members consist of a resilient strip which is secured at one end to the periphery of the color selection electrode and is provided at its other end with an opening receiving a conical cam on the wall of the tube.
  • the position of the color selection electhe errors resulting from this displacement, the shadow mask must be displaced slightly towards the phosphor screen so that the holes are again located on the connection line between the center points of the color elements associated with these holes and the mean deflection point of the electron beams.
  • the errors resulting from the non-symmetrical distribution of the supporting members along the periphery of the mask can be reduced if the supporting members are arranged so that they cross the axis of the tube.
  • the securing point of each member to the periphery of the shadow mask describes an arc of a circle the center point of which is constituted by the supporting point of this member in the Wall of the tube, which are of a circle produces a movement having not onlya component directed towards the phosphor screen-but also a component directed at right angles to the axis of the tube.
  • the whole shadow mask will not only be slightly moved towards the phosphor screen, but will also be slightly displaced, so that the center point of the screen trode is entirely determined by the position and the length of the resilient supporting members and also by the area at which the opening surrounds the conical cam.
  • the supporting member Due to thermal expansion of the color selection electrode in operation, the supporting member is twisted and the strip then pivots about the cam. This may result in wear and hence in a change of the position of the color selection electrode during the life of the tube. Moreover, the contact point between the strip and the cam can be displaced along the longitudinal axis of the cam during the pivotal movement.
  • At least one of the suspension members consists of at least two parallel flat strips which are spaced apart by a certain distance and which are bent over at their ends and are directly or indirectly interconnected.
  • the strips then form the boundaries of a parallelogram so that a straight-line guiding of the mask is obtained. Since the part of the suspension member surrounding the cam no longer performs pivotal movements with respect to the cam, displacement and wear at this area are avoided. If it is ensured that the parallel strips are twisted only at the kink points, this twisting and hence the movement of the color selection electrode are accurately defined and can be calculated beforehand.
  • the disadvantage is met that the holes in this mask are displaced with respect to the associated color elements of the display screen, especially in the proximity of the edges of the shadow mask. In order to eliminate as far as possible remains on the axis of the tube and the errors produced in the proximity of the edges of the mask owing to the asymmetrical displacement of the holes can be eliminated.
  • the suspension members are preferably arranged so that the parallel flat strips are at right angles to the main direction of the electron beams if these beams should pass through the securing point of this supporting member to the color selection electrode. This results in such a displacement of the color selection electrode that all the parts are displaced in the beam direction at the relevant areas so that the mislandings owing to expansion of the color selection electrode are completely compensated for.
  • the supporting members which are arranged outside the center of the straight sides of the color selection electrode are then at a given angle to the axis of the tube.
  • FIGURES 1, 2, 3 and 4 are different embodiments of suspension members according to the invention.
  • FIGURE 5 is an elevation
  • FIGURE 6 is a sectional view of another embodiment of a supporting member.
  • reference numeral 1 denotes the glass window and reference numeral 2 a color selection electrode which has the form of a shadow mask and is secured to an annular frame 3.
  • the window 1 is provided with three glass cams 4 which are distributed asymmetrically along the periphery of the frame 3.
  • the parallel strips 5 and 6 are spaced apart by a certain distance and are bent over at their ends. Though in FIGURES 1 and 2, the bent-over ends of the strips are interconnected, they bear by means of an auxiliary strip 7 on the cam 4. In FIG- URES 3 and 4, the ends are on the one hand relatively independently secured to the annular frame 3 and on the other hand to the auxiliary strip 8. The strips from the boundaries of a parallelogram.
  • the straight sides of the parallelogram have a sufiicient rigidity so that twisting mainly occurs at the kink points of the strips 5 and 6. This may be achieved by welding auxiliary strips to the straight sides. If desired, the straight strips 5 and 6 may also be reinforced by pressing ribs into them.
  • the supporting members may consist of more than two parallel strips. The material of the strips may then be thinner, the rigidity of the members being the same, so that reinforcing ribs can be more readily pressed.
  • FIG- URES 5 and 6 A very advantageous embodiment is shown in FIG- URES 5 and 6, in which a reinforcing strip 9 is arranged 3 on the fiat side of the parallelogram which must be secured to the mask ring 3. Due to the fact that the strip 9 projects on both sides beyond the strip 6, the projecting parts of the strip 9 can be rigidly secured to the mask frame 3 by means of spotwelding.
  • the strip 5 is provided with a hole 10 for receiving the cam 4, which hole has the usual substantially triangular form so that the mask can be more readily removed from the window, for a round opening tightly surrounds the conical cam 4.
  • the supporting members are preferably arranged so that the strips 5 and 6 are at right angles to the'main direction of electron beams which would pass through the securing points of the supporting member to the mask frame; Upon heating, the mask will then be displaced so that all its holes are displaced in the beam direction at the relevant areas so that a full compensation is obtained;
  • a cathode-ray tube for displaying colored television images comprising an envelope having a display window at one end thereof, a luminescent screen supported by said window, a substantially rectangular shadow mask arranged in the proximity of the luminescent screen, said shadow mask having a plurality of apertures aligned with selected areas of the luminescent screen, at last three stripshaped supporting members for supporting said shadow mask within said envelope, said supporting members being arranged off the center of a straight side of the mask, each of said supporting members being secured at one end to the periphery of the shadow mask at the other end by a supporting stud in the wall envelope, at least one of the suspension members consisting of four flat spaced strips forming a parallelogram having a side fastened to the frame of said shadow mask and having an opposite side forming part of a strip longer than said side and including an aperture therein fitting over said supporting stud, the sides connecting said opposite sides being substantially at right angles to a line from the deflection center of said tube.
  • a cathode-ray tubefas claimed in claim 1 in which the strips are supported by an auxiliary strip by the supporting assuren the wall of the'tube.
  • a cathode-ray tube as claimed in claim 1 in which an auxiliary strip projects 'on both sid'es beyond the supporting member" and is secured by the projecting ends to the shadow mask.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US682945A 1966-11-19 1967-11-14 Parallelogram mounting fixture for shadow mask Expired - Lifetime US3487251A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6616317A NL6616317A (enrdf_load_stackoverflow) 1966-11-19 1966-11-19

Publications (1)

Publication Number Publication Date
US3487251A true US3487251A (en) 1969-12-30

Family

ID=19798233

Family Applications (1)

Application Number Title Priority Date Filing Date
US682945A Expired - Lifetime US3487251A (en) 1966-11-19 1967-11-14 Parallelogram mounting fixture for shadow mask

Country Status (7)

Country Link
US (1) US3487251A (enrdf_load_stackoverflow)
AT (1) AT276504B (enrdf_load_stackoverflow)
BE (1) BE706723A (enrdf_load_stackoverflow)
CH (1) CH466856A (enrdf_load_stackoverflow)
DE (1) DE1537272A1 (enrdf_load_stackoverflow)
GB (1) GB1158219A (enrdf_load_stackoverflow)
NL (1) NL6616317A (enrdf_load_stackoverflow)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832592A (en) * 1971-07-05 1974-08-27 Hitachi Ltd Mask electrode support for color picture tube
US4300071A (en) * 1979-12-10 1981-11-10 Zenith Radio Corporation Four-corner shadow mask suspension system for television cathode ray tubes
US4315189A (en) * 1979-02-14 1982-02-09 Toshiba Corporation Support structure for shadow mask of color cathode ray tube
US4335329A (en) * 1979-05-18 1982-06-15 Hitachi, Ltd. Mask support for shadow mask assembly
US4387321A (en) * 1980-07-21 1983-06-07 U.S. Philips Corporation Color display tube and suspension means for color selection electrode
US4439709A (en) * 1982-04-29 1984-03-27 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US4460843A (en) * 1982-04-29 1984-07-17 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US4613785A (en) * 1984-03-29 1986-09-23 Rca Corporation Color picture tube having an improved simplified support structure for a color selection electrode
EP0281114A1 (en) * 1987-03-06 1988-09-07 Kabushiki Kaisha Toshiba Color picture tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1245379B (it) * 1991-03-28 1994-09-20 Videocolor Spa Tubo di riproduzione di immagini a colori dotato di un supporto perfezionato del complesso a maschera d'ombra-telaio

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2846608A (en) * 1954-09-14 1958-08-05 Rca Corp Cathode-ray tube
US3296477A (en) * 1964-06-12 1967-01-03 Rca Corp Cathode ray tube with electrode supported by strap-like springs
US3330980A (en) * 1965-07-16 1967-07-11 Rca Corp Shadow mask mounted with bi-metallic sections connected by expansible loop
US3370194A (en) * 1966-05-31 1968-02-20 Nat Video Corp Color tube mask mounting including means for limiting shift of the mask center
US3387160A (en) * 1967-01-11 1968-06-04 Nat Video Corp Mounting means for moving shadow mask axially forward upon heating
US3399319A (en) * 1966-10-18 1968-08-27 Nat Video Corp Color kinescope mounting assembly for shifting shadow mask during thermal expansion

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2846608A (en) * 1954-09-14 1958-08-05 Rca Corp Cathode-ray tube
US3296477A (en) * 1964-06-12 1967-01-03 Rca Corp Cathode ray tube with electrode supported by strap-like springs
US3334259A (en) * 1964-06-12 1967-08-01 Rca Corp Shadow mask mounting structure
US3330980A (en) * 1965-07-16 1967-07-11 Rca Corp Shadow mask mounted with bi-metallic sections connected by expansible loop
US3370194A (en) * 1966-05-31 1968-02-20 Nat Video Corp Color tube mask mounting including means for limiting shift of the mask center
US3399319A (en) * 1966-10-18 1968-08-27 Nat Video Corp Color kinescope mounting assembly for shifting shadow mask during thermal expansion
US3387160A (en) * 1967-01-11 1968-06-04 Nat Video Corp Mounting means for moving shadow mask axially forward upon heating

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832592A (en) * 1971-07-05 1974-08-27 Hitachi Ltd Mask electrode support for color picture tube
US4315189A (en) * 1979-02-14 1982-02-09 Toshiba Corporation Support structure for shadow mask of color cathode ray tube
US4335329A (en) * 1979-05-18 1982-06-15 Hitachi, Ltd. Mask support for shadow mask assembly
US4300071A (en) * 1979-12-10 1981-11-10 Zenith Radio Corporation Four-corner shadow mask suspension system for television cathode ray tubes
US4387321A (en) * 1980-07-21 1983-06-07 U.S. Philips Corporation Color display tube and suspension means for color selection electrode
US4439709A (en) * 1982-04-29 1984-03-27 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US4460843A (en) * 1982-04-29 1984-07-17 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US4613785A (en) * 1984-03-29 1986-09-23 Rca Corporation Color picture tube having an improved simplified support structure for a color selection electrode
EP0281114A1 (en) * 1987-03-06 1988-09-07 Kabushiki Kaisha Toshiba Color picture tube
US4886997A (en) * 1987-03-06 1989-12-12 Kabushiki Kaisha Toshiba Color picture tube with shadow mask support assembly

Also Published As

Publication number Publication date
AT276504B (de) 1969-11-25
CH466856A (de) 1968-12-31
BE706723A (enrdf_load_stackoverflow) 1968-05-17
DE1537272A1 (de) 1969-10-16
NL6616317A (enrdf_load_stackoverflow) 1968-05-20
GB1158219A (en) 1969-07-16

Similar Documents

Publication Publication Date Title
US3487251A (en) Parallelogram mounting fixture for shadow mask
US3529199A (en) Shadow mask having elements bridging corners of integral,longitudinally-extending portions
US5103132A (en) Colour display tube with shadow mask less sensitive to microphonics
GB2140968A (en) Cathode-ray tube having an improved screen grid electrode of an inline electron gun
US4049991A (en) Longitudinal rib embossment in tri-apertured, substantially planar electrode
US4556819A (en) Color picture tube having inline electron gun with coma correction members
US4763039A (en) Color display tube with corner suspension means
US3987328A (en) In-line type electron gun assembly for use in multi-beam type color picture tubes
US4599533A (en) Color picture tube having shadow mask frame with truncated corners
US4605878A (en) Supporting device for an electron beam landing position selecting mask of a color cathode ray tube
RU2093919C1 (ru) Способ изготовления электронного прожектора
US4293792A (en) Color picture tube having improved slit type shadow mask
US5434471A (en) Electron gun having focusing electrode and anode with a plurality of straight line segments
GB2175743A (en) Cathode-ray tube electron gun having improved screen grid
KR100385214B1 (ko) 평면형 음극선관의 텐션 마스크 프레임 조립체
US4049990A (en) CRT in-line gun electrode having strengthening ribs
US5689150A (en) Color picture tube having improved shadow mask frame
US5834887A (en) Color cathode ray tube comprising an in-line electron gun with extended outer apertures
US6800992B2 (en) In-line type electron gun and color picture tube apparatus using the same
KR20040021584A (ko) 저 열팽창 계수의 마스크가 고 열팽창 계수의 프레임에부착된 컬러 브라운관
KR100245176B1 (ko) 빔 형성 영역의 구조가 개선된 인라인전자총
US6586869B1 (en) Electrodes of electron gun
KR100223839B1 (ko) 칼라 브라운관용 전자총의 음극지지체
JP4068054B2 (ja) Ｃｒｔ用溶接無しのマスク支持ブレード構造
KR950002689Y1 (ko) 전자총용 음극 지지체