公开(公告)号：JPH08162034A

公开(公告)日：1996-06-21

申请号：JP25239295

申请日：1995-09-29

Applicant: TOSHIBA CORP

Inventor： SHIMIZU NORIO ,  OHAMA SHINJI ,  INOUE MASACHIKA

IPC: H01J29/07

Abstract: PURPOSE: To improve color purity of the color picture tube provided with a shadow mask of which a substantially rectangular shaped effective surface is made of a curved surface and constituting an electron beam passing pore column in which the electron beam passing pores on the effective surface extend in column along the short axis of the effective surface by specifying the tilt of the electron beam passing pores. CONSTITUTION: An electron beam passing pore column 42 is bent to different shapes depending upon the position on an effective surface 34, and an electron beam passing pore 41 is tilted along the electron beam passing column pore 42. In an area where the till on the long side of an effective surface 34 of this electron beam passing pore 41 is pinched by means of the short side of the effective surface 34 and a point 1/4 inside of the dimensions between short sides from this short side, the electron beam passing pore 41 end part of the lon side is tilted the maximum in the positive direction closer to the short-axis direction of the effective surface 34 than the opposite side end part, and in the 1/3 inside of the dimensions between short sides from the long side, the tilt increases as the distance from the short axis of the effective surface 34s increases, and the tilt decreases or is inverted as it approaches to the short side so as to have the minimum value.

公开(公告)号：JPH0864146A

公开(公告)日：1996-03-08

申请号：JP19841594

申请日：1994-08-23

Applicant: TOSHIBA CORP

Inventor： TANI MUNECHIKA ,  MURAI TAKASHI ,  INOUE MASACHIKA

IPC: H01J29/07

Abstract: PURPOSE: To restrict the local thermal expansion by setting a difference between the outer diameter of a mask main body and the inner diameter of a mask frame in the long edge side of a shadow mask larger than the difference thereof in the short edge side of the shadow mask. CONSTITUTION: A shadow mask 24 of a color picture-tube is formed so that the outer diameters of the long edge side and the sort edge side of a mask main body 35 are formed smaller than the inner diameters of the long edge side and the short edge side of a mask frame 25 except for welding parts of the mask main body 35 and the mask frame 25. A difference Δsy between the outer diameter in the long edge side of the main body 35 and the inner diameter in the short edge side of the frame 25 is formed larger in average than a difference Δsx between the outer diameter in the short edge side of the main body 35 and the inner diameter in the short edge side of the frame 25. In the case where an image at a high luminance is locally displayed for a short time, even in the case where the main body 35 is expanded and the stress is generated in the main body 35, a large stress to be generated in the long edge side of the main body 35 can be restricted because the angle of deflection of the electron beam at a central part of the main body 35 is small and displacement of the beam landing is small, and because the peripheral part is welded to the frame 25 and thermal expansion of the main body 35 is restricted.

公开(公告)号：JPH05211044A

公开(公告)日：1993-08-20

申请号：JP1569292

申请日：1992-01-31

Applicant: TOSHIBA CORP

Inventor： TAKAHASHI TORU ,  AKOU NOBUHIKO ,  SHIMIZU NORIO ,  INOUE MASACHIKA

IPC: H01J29/02 ,  H01J31/20

Abstract: PURPOSE:To attach and detach a shadow mask easily. CONSTITUTION:In a color picture tube, a shadow mask is supported on the inner side of a panel 21 attachably and dettachably with stud pins 31 provided on the panel and holders 32 attached to a mask frame 30 and fitted in respective stud pins, and the holder consists of a fixing portion 34 to be fixed to the mask frame and a supporting portion 36 to be fitted in the stud pin and an elastic deformable portion 37 connecting the fixing portion to the supporting portion. An auxiliary portion 38 for attachment and detachment is provided on the supporting portion of at least one of the holders at a position nearer to the mask frame than the supporting portion of the holder.

公开(公告)号：JPH0278138A

公开(公告)日：1990-03-19

申请号：JP9022189

申请日：1989-04-10

Applicant: TOSHIBA CORP

Inventor： FUJIWARA TAKESHI ,  TOKITA KIYOSHI ,  INOUE MASACHIKA

IPC: H01J29/51 ,  H01J29/76

Abstract: PURPOSE:To decrease deflecting aberration so as to prevent deterioration of focusing properties in the periphery of a picture by placing permanent magnets on the way of three electron beam routes. CONSTITUTION:While their polarity being set to be in reverse, a pair of permanent magnets 28a, 28b having magnetic polar in the both ends are placed up and down-sides of a side end 27 of an electron gun composing body of a deflecting apparatus 21. By setting like this, the magnets 28a, 28b, corresponding to a barrel type perpendicularly deflecting magnetic field 42, form an intensive pin cushion type magnetic field 43 in an area three electron beams (B), (G), (R) passing. Formation of an ellipse having the major axis in horizontal direction of a beam spot depending on the magnetic field 42 and declining phenomenon of spots of a pair of side beams are corrected. Besides, correction corresponding to deflecting current of an apparatus is carried out by a magnetic field correcting device installed in the bottom of a convergence cup. Lorentz effect of moving side beams (B), (R) toward center beam (G) is caused by the magnetic field 43.

公开(公告)号：JPH0249331A

公开(公告)日：1990-02-19

申请号：JP20061188

申请日：1988-08-11

Applicant: TOSHIBA CORP

Inventor： MURAI TAKASHI ,  TOKITA KIYOSHI ,  INOUE MASACHIKA ,  FUJIWARA TAKESHI

IPC: H01J9/42 ,  H01J9/14

Abstract: PURPOSE:To enable the preliminary detection of the vibration resistance strength of a shadow mask by applying an alternate current magnetic field for excitation between processes for forming a mask proper and jointing a panel to a funnel. CONSTITUTION:A shadow mask 4 is mounted at an inspection position and an alternate current exciting current is supplied to an excitation coil 31. The frequency of a magnetic field is thereby varied continuously within a range of 200 to 500Hz and the vibration of each part of the mask 4 is detected via an optical sensor 33. Furthermore, a detected signal obtained from the sensor 33 is operated and processed with an amplitude read device 34, thereby obtaining the maximum amplitude of the mask 4. As the resonance frequency of the shadow mask 4 proper approximately agrees to the frequency wherein an electron beam in a finished color image receiving tube gives a maximum amplitude, the aforesaid method is used to detect and select a resonance point for the case of the mask 4 proper and it becomes thereby possible to eliminate the malfunction of the finished image receiving tube due to a vibration. According to this construction, a loss due to the detection of a defective product after assembly is eliminated and it becomes possible to make efficient inspection.

公开(公告)号：JPH0240842A

公开(公告)日：1990-02-09

申请号：JP18825288

申请日：1988-07-29

Applicant: TOSHIBA CORP

Inventor： HIROTA KOJI ,  INOUE MASACHIKA ,  AMITSU NOBUHIKO

IPC: H01J29/76

Abstract: PURPOSE:To improve the image plane grade by correcting the difference between the action to a pair of side beams and the action to the center beam of a coma correcting magnetic field generated by a pair of auxiliary coils by means of a barrel-form magnetic field formed by a magnetic field forming means. CONSTITUTION:A pair of auxiliary coils 8 generating a magnetic field for correcting a coma caused by the deflection magnetic field of a vertical deflection coil 30, and a magnetic field forming means 34 forming a magnetic field for correcting the action to three electron beams 1a-1c of the coma correcting magnetic field generated by the auxiliary coils 8 are provided. The difference between the action to a pair of side beams 1a, 1c and the action to the center beam 1b of the coma correcting magnetic field generated by the auxiliary coils 8 is corrected by the magnetic field formed by the magnetic field forming means 34. Hence, the three electron beams 1a-1c can be accurately collected over the whole image plane to improve the image plane grade.

公开(公告)号：JPS62223949A

公开(公告)日：1987-10-01

申请号：JP6584386

申请日：1986-03-26

Applicant: TOSHIBA CORP

Inventor： INOUE MASACHIKA ,  AKOU NOBUHIKO

IPC: H01J29/07

Abstract: PURPOSE:To strengthen the spherical surface strength of the peripheral portion of a shadow mask with a pushing pressure caused by the insertion of a projecting part into a frame to prevent the local vibration of the shadow mask by providing the projecting part toward outside on the skirt portion of the shadow mask. CONSTITUTION:A shadow mask assembly for a color picture tube is constructed by inserting the skirt portion 7c of a shadow mask 7 made of a low thermal expansion material such as invar alloy or the like into the inside of a frame 10 and welding them at respective points on the horizontal, vertical and diagonal line. And projecting parts 12 toward outside are provided at least on the short sides of the skirt portion 7c, and the total length of the projecting parts is decided to be 35-85% of that of the short side. Thus when the skirt portion 7c is inserted into the frame 10, by the pushing pressure of the projecting parts 12 the spherical surface strength of the peripheral portion 7b of the shadow mask is increased. Therefore the local vibration of the shadow mask 7 due to the sound signal or the like can be prevented to eliminate the deterioration of the color purity.

公开(公告)号：JP2003162969A

公开(公告)日：2003-06-06

申请号：JP2001360591

申请日：2001-11-27

Applicant: TOSHIBA CORP

Inventor： AKOU NOBUHIKO ,  TAKAHASHI TORU ,  INOUE MASACHIKA

IPC: H01J9/227 ,  H01J29/32

Abstract: PROBLEM TO BE SOLVED: To provide a color cathode-ray tube and its phosphor screen forming method, which are improved in the contrast deterioration due to the reflection of ambient light reflection caused by a metal back layer and mislandings when a phosphor screen is formed without a black light absorbing layer, even though a black stripe type with the black light absorbing layer is put to practical use for a phosphor screen of color cathode-ray tubes. SOLUTION: In this color cathode-ray tube, a color filter layer 22 formed with a relatively close space is coated on the inside surface of a face panel 11, and on the color filter layer 22, a phosphor layer 23 having overlapping portions 25G and 25R, in which the adjacent side ends between phosphors are made to overlap each other is formed, and further a metalback layer 24 is formed on the phosphor layer 23. COPYRIGHT: (C)2003,JPO

公开(公告)号：JP2002260549A

公开(公告)日：2002-09-13

申请号：JP2001392572

申请日：2001-12-25

Applicant: TOSHIBA CORP

Inventor： NAKAYAMA TAKESHI ,  NAKAGAWA SHINICHIRO ,  MURAI TAKASHI ,  INOUE MASACHIKA

IPC: H01J29/07

Abstract: PROBLEM TO BE SOLVED: To provide a color cathode-ray tube which is capable of suppressing the displacement of a shadow mask caused by thermal expansion, thence improving production stability and picture quality. SOLUTION: In this color cathode-ray tube, a shadow mask 19 comprises an effective area 17 which is nearly rectangular, in addition disposed facing a phosphor screen and formed many through holes 16 for electron beams, and also has skirt portions 18 which are formed in the periphery of the effective area so as to extend in the direction along a tube axis with a nearly rectangular frame-like shape. Here the skirt portion possesses a pair of long sides extending nearly parallel to a major axis X and a pair of short sides extending nearly parallel to a minor axis Y, and each of long sides and short sides is welded on an inner surface of a nearly rectangular mask frame, and also a distance from the extended end of the skirt portion to welding points in each long side is made to be longer than that in each short side.

公开(公告)号：JP2002245948A

公开(公告)日：2002-08-30

申请号：JP2001038023

申请日：2001-02-15

Applicant: TOSHIBA CORP

Inventor： NAKAGAWA SHINICHIRO ,  ITO YOSHIAKI ,  MURAI TAKASHI ,  INOUE MASACHIKA

IPC: H01J29/07 ,  H01J29/86

Abstract: PROBLEM TO BE SOLVED: To provide a color picture tube that shapes an effective surface of a shadow mask for a high curved surface holding strength, and thereby reduces a wall thickness difference between an inner and an outer surface of an effective part of a panel and improves visibility. SOLUTION: The outer surface of the substantially rectangular effective part 1 of the panel has a substantially plane surface or a slight curvature. The effective surface of the shadow mask 9 has distances from the center to a major axis and a minor axis end respectively designated by H and V. The shadow mask is formed to meet: 2