US3829728A - Inlet screen for an electronic optical image amplifier and method of making it - Google Patents

Inlet screen for an electronic optical image amplifier and method of making it Download PDF

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Publication number
US3829728A
US3829728A US00269355A US26935572A US3829728A US 3829728 A US3829728 A US 3829728A US 00269355 A US00269355 A US 00269355A US 26935572 A US26935572 A US 26935572A US 3829728 A US3829728 A US 3829728A
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US
United States
Prior art keywords
layer
screen
carrier
optical image
coating
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
US00269355A
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English (en)
Inventor
F Gudden
W Schubert
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.)
Siemens AG
Siemens Corp
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Siemens Corp
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Filing date
Publication date
Application filed by Siemens Corp filed Critical Siemens Corp
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Publication of US3829728A publication Critical patent/US3829728A/en
Anticipated expiration legal-status Critical
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    • 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
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/36—Photoelectric screens; Charge-storage screens
    • H01J29/38—Photoelectric screens; Charge-storage screens not using charge storage, e.g. photo-emissive screen, extended cathode
    • H01J29/385—Photocathodes comprising a layer which modified the wave length of impinging radiation

Definitions

  • An inlet screen for an electronic optical image amplifier has a luminous layer placed upon a carrier which is followed by a photo cathode.
  • the invention is particularly characterized in that the luminous layer is provided from the center to the edge with an absorbing substance in a manner counteracting the dropping brightness.
  • This invention relates to an inlet screen for an electronic optical image amplifier wherein a luminous layer is placed upon a carrier and is followed by the actual photo cathode layer.
  • a luminous layer is placed upon a carrier and is followed by the actual photo cathode layer.
  • Such layer arrangements are used in electronic optical image amplifiers particularly in order to change X-rays into a radiation which has a good effect upon the photo cathode layer. Otherwise X-rays would have a very little effect upon the'photo cathode layer, since they are absorbed in the thin layer only to a very small extent.
  • An object of the present invention is to improve existing devices of this type.
  • Another object is to balance the described drop in brightness so that a uniformly bright image is produced.
  • this can be accomplished when a carrier of aluminum is used by applying thereon prior to the application of the luminous layer an absorbing layer consisting of carbon and thus constituting a blackening.
  • the application can be carried out by steaming and can be so regulated by fixed or movable screens that the layer is thinner in the radial outward direction. This results in that the reflection of the carrier increases in the same direction. This also provides an increase in the density of the radiation which is transmitted from the inlet screen edgewise upon the photo cathode.
  • suitable actuation such as an optical control of the steaming at several points, the brightness can be always precisely compensated.
  • the blackening of the carrier on the side upon which lies the luminous screen layer results in a substantial improvement in the local transmission function of the screen.
  • the stronger absorbing coating which increases from the edge toward the center improves the modulation transmission function in the particularly important center of the image without making worse the'transmission function at the edge at a predetermined radiation density, as compared to a screen having no blackenmg.
  • the distribution of light can also take place by absorbing substances which are introduced into the layer or applied thereon in suitable manner.
  • a feature of the present invention is that the drop in brightness is not compensated by making the luminous the edge it would be necessary to accept a noticeable worsening of the transmission function. On the other hand a thinner coating in the middle would result in an insufficient ray absorption.
  • FIG. 1 is a diagrammatic partly sectional view through an electronic optical X-ray image amplifier.
  • FIG. 2 is a partly sectional view illustrating the making of an inlet screen.
  • FIG. 1 shows a vacuum tight piston 1 having an inlet screen 3 behind the inlet window 2.
  • the screen is followed, for example, by electrodes 4 and 5, an anode 6 and an outlet or viewing screen 7 which can be examined through the end window 8.
  • the inlet screen made in accordance with the present invention consists of a carrier calotte 9 carrying in the middle a thicker graphite layer 10 and coated inwardly with a luminous layer 1 1.
  • FIG. 2 shows a device for producing the graphite layer 10 extending toward the side.
  • the device consists essentially of a vacuum tight jar 13 mounted upon an equally tight table 14 and evacuated by a suction joint 15.
  • evaporators l6 and 17 used to coat the calotte 18.
  • the calotte is mounted as cover upon a cylinder 19 which is mounted by rollers 20 and 21 upon the table 14 and which is also rotated by the motor 22 and the frictional wheel 23, so that the calotte 18 is uniformly coated even if the centering is not precise.
  • the coating of the calotte is determined by the light source 25 and the accordingly set measuring device 26 which can be read at an indicating device 28 connected with the device 26 by a line 27.
  • the unit is operated in that carbon vapor produced in the evaporator 17 provides a strong coating in the middle of the calotte 18 while at the sides a shadowing takes place by the screen 24 which is not strongly represented upon the calotte 18, whereby a continuous coating is produced.
  • the diameter of the opening 29 of the screen is so selected that the desired balancing of dropping brightness is produced.
  • the coating with carbon is terminated when the instrument 28 shows that percent of the passing light has been reduced to about 40 percent. Then a luminous substance can be applied by the evaporator 16. However, the screen 24 must be removed to provide a uniform thickness of the luminous coating.
  • a carrier calotte 9 which consists of metal and is not transparent
  • the control of the application by transmitted rays cannot be carried out.
  • a mirror shown by broken lines
  • a bundle of rays which then passes from the mirror 30 to a source 25 directed to the receiver 26, can be collected then in the receiver 26 which corresponds to the measuring device 26 and can be further treated in the same manner as in the above-described devices 26 to 28.
  • the vapor application can be also controlled in time. However, reproduction requirements must be met.
  • the data of the vapor application means are set according to data produced by experience. The control can be also strengthened by the visual observation of the vapor application.
  • an inlet screen comprising an outer carrier, a photo cathode layer, a luminous layer extending between said carrier and said photo cathode layer and carried by said carrier, and a coating of a light absorbent substance carried by said luminous layer upon the side thereof directed toward said carrier and being the rear side relatively to said photo cathode layer, the thickness of said coating diminishing from the center toward the edges of said layer to balance the dropping brightness of the layer.

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US00269355A 1971-07-08 1972-07-06 Inlet screen for an electronic optical image amplifier and method of making it Expired - Lifetime US3829728A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2134110A DE2134110B2 (de) 1971-07-08 1971-07-08 Eingangsschirm für elektronenoptischen Bildverstärker und Verfahren zur Herstellung einer verlaufenden Schicht des Eingangsschirms

Publications (1)

Publication Number Publication Date
US3829728A true US3829728A (en) 1974-08-13

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US00269355A Expired - Lifetime US3829728A (en) 1971-07-08 1972-07-06 Inlet screen for an electronic optical image amplifier and method of making it

Country Status (3)

Country Link
US (1) US3829728A (enrdf_load_html_response)
DE (1) DE2134110B2 (enrdf_load_html_response)
FR (1) FR2144827B3 (enrdf_load_html_response)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4725724A (en) * 1985-04-26 1988-02-16 U.S. Philips Corporation Radiographic image intensifier
US4880965A (en) * 1987-03-13 1989-11-14 Kabushiki Kaisha Toshiba X-ray image intensifier having variable-size fluorescent crystals
US5171996A (en) * 1991-07-31 1992-12-15 Regents Of The University Of California Particle detector spatial resolution
US20020089196A1 (en) * 1998-07-29 2002-07-11 Porter Marshall Ray Bumper beam extensions

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5773853U (enrdf_load_html_response) * 1980-10-22 1982-05-07
FR2545270B1 (fr) * 1983-04-29 1985-12-27 Thomson Csf Intensificateur d'images radiologiques et application a un systeme de radiologie numerique
NL8900040A (nl) * 1989-01-09 1990-08-01 Philips Nv Roentgenbeeldversterkerbuis met selectief filter.
DE102007050437A1 (de) * 2007-10-22 2009-04-23 Siemens Ag Szintillator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4725724A (en) * 1985-04-26 1988-02-16 U.S. Philips Corporation Radiographic image intensifier
US4880965A (en) * 1987-03-13 1989-11-14 Kabushiki Kaisha Toshiba X-ray image intensifier having variable-size fluorescent crystals
US5171996A (en) * 1991-07-31 1992-12-15 Regents Of The University Of California Particle detector spatial resolution
US20020089196A1 (en) * 1998-07-29 2002-07-11 Porter Marshall Ray Bumper beam extensions

Also Published As

Publication number Publication date
DE2134110B2 (de) 1978-09-14
FR2144827A1 (enrdf_load_html_response) 1973-02-16
DE2134110A1 (de) 1973-01-18
FR2144827B3 (enrdf_load_html_response) 1975-08-29

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