EP0087674A1 - Bildröhre - Google Patents

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Publication number
EP0087674A1
EP0087674A1 EP83101447A EP83101447A EP0087674A1 EP 0087674 A1 EP0087674 A1 EP 0087674A1 EP 83101447 A EP83101447 A EP 83101447A EP 83101447 A EP83101447 A EP 83101447A EP 0087674 A1 EP0087674 A1 EP 0087674A1
Authority
EP
European Patent Office
Prior art keywords
output
fluorescent screen
image tube
glass substrate
laminated structure
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.)
Ceased
Application number
EP83101447A
Other languages
English (en)
French (fr)
Inventor
Motohisa Tsuda
Yutaro Kimura
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.)
Shimadzu Corp
Original Assignee
Shimadzu 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
Priority claimed from JP57028025A external-priority patent/JPS57157297A/ja
Application filed by Shimadzu Corp filed Critical Shimadzu Corp
Publication of EP0087674A1 publication Critical patent/EP0087674A1/de
Ceased 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8901—Fixing of optical components to the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8913—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices

Definitions

  • the present invention relates to an improvement of an output fluorescent screen structure for an image tube.
  • an output fluorescent structure (1) is attached to the inner face of an output glass pane (3) of an image tube main body through a vacuum layer (2). Therefore, there has been experienced such an inconvenience that part of a visible ray emitted at an output fluorescent screen (4) is subjected to a total reflection at an outer side face of a glass substrate or glass base plate (5) laminated with the output fluorescent screen (4), with the total reflection light (L l ) being again directed back to the output fluorescent screen (4), thus resulting in a deterioration in the contrast of the output image.
  • the thickness of the glass base plate (5) which has been in the order of about 1 mm or thereabout up to the present must be increased to the range of at least ten and several mm or so, and in the case where the output fluorescent screen is to be formed on the glass substrate having the thickness to such an extent, various problems as follows are inevitably brought about.
  • an essential object of the present invention is to provide an improved image tube which will solve the problems related to the manufacture as described above, with simultaneous elimination of deterioration in the contrast of the output images.
  • an output fluorescent screen structure for the image tube is constituted by a transparent glass substrate coated with a fluorescent screen, and an output window glass pane of the image tube main body closely stuck onto the transparent glass substrate by a transparent bonding material to form a laminated structure thereby, while the thickness of the laminated structure is set to such an extent as is sufficient to cause a total reflection of light emitted at a peripheral portion of an effective visual field of said fluorescent screen and incident into the laminated structure, to reach outside a concerned or interested region within said effective visual field of said output fluorescent screen.
  • the thickness of the output window glass pane is utilized as part of the thickness of the glass substrate required for improving the contrast of the output image, whereby it becomes possible to employ a plate with a thin thickness for the glass substrate to be coated with the output fluorescent screen, and thus, various problems related to the manufacture as described earlier may be advantageously solved.
  • FIG. 2 there is shown an output fluorescent screen structure of an image tube according to one preferred embodiment of the present invention.
  • the output fluorescent screen structure (1) is constituted by causing a glass substrate (5) coated with an output fluorescent screen (4), to closely adhere onto the inner face of an output glass pane (3) of the image tube main body through a transparent bonding material (6).
  • the thickness (t) of the laminated structure thus constituted is set to such an extent as is sufficient to cause a total reflection light (L 2 ) emitted at a peripheral portion (So) of an effective visual field of said fluorescent screen (4) and incident into the laminated structure, to reach the outer side of a concerned or interested region (S ) of the output fluorescent screen (4) which becomes an important portion, for example, in a medical diagnosis.
  • the image at the region (S 1 ) in the range of 10 to 12 mm in diameter at the central portion constitutes an important portion for the diagnosis, for example, when an effective visual field diameter (D) of the output image is 22 mm.
  • D effective visual field diameter
  • (X) represents a distance between a light emitting point (P ) on the output fluorescent screen (4) and a reaching point (PI) at which the visible ray in the light emitting point (P ) subjected to the total reflection at the outer side face of the output window glass pane (3) again returns back to the output fluorescent screen (4)
  • ( ⁇ ) denotes a critical angle at a boundary face (3') between the output glass pane (3) and air when the refractive indexes of the respective layers are assumed the same.
  • the plate thickness of the output window glass pane (3) of the image tube main body is normally in the range of 4 to 5 mm, if the remaining plate thickness in the order of 4 to 5 mm is supplemented by the thickness of the transparent bonding material (6) and the glass substrate (5), it is possible to lead the total reflection light (L 2 ) at the boundary face (3') between the output window pane (3) and air, towards the outer side of the concerned region (S 1 ) of the output fluorescent screen (4) described earlier for the improvement of the contrast at said image portion (S 1 ).
  • FIG. 3 there is shown a modification of the foregoing embodiment.
  • another transparent glass plate (7) is further arranged to closely adhere to the outer side face of the output window glass pane (3) by the transparent bonding material (6).
  • the thickness of the laminated structure required for the improvement of the contrast of the output image may be shared by the thickness of the transparent glass plate (7), and therefore, the thickness of the glass substrate (5) can be reduced still further.
  • the reflection at the outer side face of the output window also degrades the contrast of output image.
  • a non-reflecting coating directly onto the outer side face of the output window glass pane (3) will become difficult owing to the large size of the image tube main body, such a purpose may be readily achieved in this case by causing the transparent glass plate (7) preliminarily applied with a non-reflecting coating, to closely adhere to the outer side face of the output window glass plate (3).
  • the numeral (8) represents a metal hack layer.
  • the transparent bonding material (6) to be employed in the foregoing embodiments, proper materials capable of maintaining durability even under a state of high vacuum and the same refractive index as the using glasses, for example, silicone rubber or the like, may be employed.
  • the output fluorescent screen structure is constituted by the laminated structure formed by close adhesion between the glass substrate and the output window glass pane, it is possible to arrange the plate thickness of the output fluorescent screen structure necessary for the improvement of the contrast in the output images, to be shared by the glass base plate and the output window glass pane. Therefore, it becomes unnecessary to employ a thick plate for the glass substrate to be coated with the output fluorescent screen, and thus, various problems in the aspect of manufacture involved in the case of production of the output fluorescent screen through employment of a thick glass substrated, can be advantageously avoided.
EP83101447A 1982-02-23 1983-02-16 Bildröhre Ceased EP0087674A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP57028025A JPS57157297A (en) 1981-02-23 1982-02-23 Electric hone and air gap adjustment
JP28025/82 1982-02-26

Publications (1)

Publication Number Publication Date
EP0087674A1 true EP0087674A1 (de) 1983-09-07

Family

ID=12237203

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101447A Ceased EP0087674A1 (de) 1982-02-23 1983-02-16 Bildröhre

Country Status (1)

Country Link
EP (1) EP0087674A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173851A1 (de) * 1984-08-10 1986-03-12 Siemens Aktiengesellschaft Elektronischer Vakuumbildverstärker für Einrichtungen zur Diagnostik mit Röntgenstrahlen
GB2199443A (en) * 1986-12-04 1988-07-06 Rank Cintel Ltd Reducing flare in cathode ray tubes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346810A (en) * 1941-11-13 1944-04-18 Polaroid Corp Cathode ray tube
US3209191A (en) * 1964-08-11 1965-09-28 Douglas Aircraft Co Inc Cathode ray tube screen and ambient light filter
DE1564706A1 (de) * 1966-09-13 1969-12-11 Siemens Ag Leuchtschirm
US3610994A (en) * 1970-08-31 1971-10-05 Sheldon Edward E Cathode-ray tubes of television type for x-rays protection

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2346810A (en) * 1941-11-13 1944-04-18 Polaroid Corp Cathode ray tube
US3209191A (en) * 1964-08-11 1965-09-28 Douglas Aircraft Co Inc Cathode ray tube screen and ambient light filter
DE1564706A1 (de) * 1966-09-13 1969-12-11 Siemens Ag Leuchtschirm
US3610994A (en) * 1970-08-31 1971-10-05 Sheldon Edward E Cathode-ray tubes of television type for x-rays protection

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0173851A1 (de) * 1984-08-10 1986-03-12 Siemens Aktiengesellschaft Elektronischer Vakuumbildverstärker für Einrichtungen zur Diagnostik mit Röntgenstrahlen
GB2199443A (en) * 1986-12-04 1988-07-06 Rank Cintel Ltd Reducing flare in cathode ray tubes
GB2199443B (en) * 1986-12-04 1990-10-03 Rank Cintel Ltd Improvements in cathode ray tubes

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR NL

17P Request for examination filed

Effective date: 19840301

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19870330

R18R Application refused (corrected)

Effective date: 19870207

RIN1 Information on inventor provided before grant (corrected)

Inventor name: TSUDA, MOTOHISA

Inventor name: KIMURA, YUTARO