Patent USRE33183E successfully refreshed from Google Patents.
USRE33183E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image intensifiers and method of producing same
Assignee: Teledyne UK Ltd
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Filing: 1988-03-10
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Granted: 1990-03-20
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Expires: 2008-03-10
Abstract
Abstract A shielded faceplate for use in an image intensifier having a photocathode which comprises an inner core of glass transparent to light to which the photocathode is sensitive and an outer shielding region of glass which absorbs light to which the photocathode is sensitive. The outer shielding region surrounds and is adjacent to the inner core. The inner core has a transverse dimension which decreases along its length, the transverse dimension being smallest at the photocathode surface. The shielded faceplate is manufactured by arranging in a mold to which glass does not bond a first type of glass transparent to light to which the photocathode is sensitive and a second type of glass which absorbs light to which the photocathode is sensitive, heating the glass members so that they fuse to produce a block having an inner core of the first type of glass and an outer region of the second type of glass and removing the block from the mold.
Inventors
- 👤 David G. Holland
- 👤 Peter B. Banks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:57
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/20; C03B23/203; H; H01; H01J; H01J29/00; H01J29/86; H01J29/861; H01J29/89; H01J9/00; H01J9/24; H01J9/244
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
120 words
A method of manufacturing a shielded faceplate for use in an image intensifier comprising a photocathode, including the steps of: arranging in a mold a member of a first type of glass transparent to light to which the photocathode is sensitive, adjacent another member of a second type of glass which absorbs light to which the photocathode is sensitive, the mold being of material to which glass does not bond; heating the members so that they fuse, thereby forming a block having a shape conforming to the internal configuration of the mold and having an inner region of the first type of glass and an outer region of the second type of glass; and removing the block from the mold.
Claim 2
Independent Claim
120 words
A method of manufacturing a shielded faceplate for use in an image intensifier comprising a photocathode, including the steps of: arranging in a mold a member of a first type of glass transparent to light to which the photocathode is sensitive, adjacent another member of a second type of glass which absorbs light to which the photocathode is sensitive, the mold being of material to which glass does not bond; heating the members so that they fuse, thereby forming a block having a shape conforming to the internal configuration of the mold and having an inner region of the first type of glass and an outer region of the second type of glass; and removing the block from the mold.
Claim 3
Dependent Claim
35 words
A method as claimed in claim 1 and wherein the block so formed includes a portion of the first type of glass which is completely encircled by a portion of the second type of glass.
Claim 4
Dependent Claim
22 words
A method as claimed in claim 1 and wherein the first and second types of glass have substantially the same refractive index.
Claim 5
Dependent Claim
24 words
A method as claimed in claim 1 and wherein the members are discs which have flat surfaces arranged adjacent each other in the mold.
Claim 6
Dependent Claim
47 words
A method as claimed in claim 4 and wherein, after the block is formed, some of the second type of glass is removed to expose a flat surface of the first type of glass which is bounded by the encircling portion of the second type of glass.
Claim 7
Dependent Claim
17 words
A method as claimed in claim 1 and wherein the members are heated in an inert atmosphere.
Claim 8
Dependent Claim
17 words
A method as claimed in claim 1 and wherein the members are initially heated at reduced pressure.
Claim 9
Dependent Claim
16 words
A method as claimed in claim 1 and wherein the material of the mold is graphite.
Claim 10
Dependent Claim
97 words
A shielded faceplate for an image intensifer including a photocathode, comprising; an inner glass member having the shape of a truncated cone, the upper surface of said inner glass member having a greater diameter than the lower surface thereof, said inner glass member being transparent to light to which said photocathode is sensitive; and an outer shielding glass member surrounding and contiguous with the outer surface of said inner glass member, said outer shielding glass member absorbing light to which said photocathode is sensitive, said photocathode being deposited on the lower surface of said inner glass member.
Claim 11
Dependent Claim
97 words
A shielded faceplate for an image intensifer including a photocathode, comprising; an inner glass member having the shape of a truncated cone, the upper surface of said inner glass member having a greater diameter than the lower surface thereof, said inner glass member being transparent to light to which said photocathode is sensitive; and an outer shielding glass member surrounding and contiguous with the outer surface of said inner glass member, said outer shielding glass member absorbing light to which said photocathode is sensitive, said photocathode being deposited on the lower surface of said inner glass member.
Claim 12
Dependent Claim
41 words
A .Iadd.method of manufacturing a .Iaddend.shielded image intensifier faceplate as claimed in claim 1 and wherein the inner region has a transverse dimension which decreases along its length, being smallest at the photocathode surface, and is surrounded by the outer region.
Claim 13
Dependent Claim
89 words
A shielded faceplate for an image intensifier including a .[.phtocathode.]. .Iadd.photocathode.Iaddend., comprising an inner core .Iadd.member .Iaddend.of glass transparent to light to which the photocathode is sensitive, and an outer shielding .[.region.]. .Iadd.member .Iaddend.of glass which absorbs light to which the photocathode is sensitive which surrounds and is .[.adjacent.]. .Iadd.fused .Iaddend.to the inner core .Iadd.member, there being a distinct boundary between said inner core member and said outer shielding member.Iaddend., the inner core .Iadd.member .Iaddend.having a transverse dimension which decreases along its length, being smallest at the photocathode surface.
Claim 14
Dependent Claim
89 words
A shielded faceplate for an image intensifier including a .[.phtocathode.]. .Iadd.photocathode.Iaddend., comprising an inner core .Iadd.member .Iaddend.of glass transparent to light to which the photocathode is sensitive, and an outer shielding .[.region.]. .Iadd.member .Iaddend.of glass which absorbs light to which the photocathode is sensitive which surrounds and is .[.adjacent.]. .Iadd.fused .Iaddend.to the inner core .Iadd.member, there being a distinct boundary between said inner core member and said outer shielding member.Iaddend., the inner core .Iadd.member .Iaddend.having a transverse dimension which decreases along its length, being smallest at the photocathode surface.
Claim 15
Dependent Claim
48 words
An image intensifier including an electron multiplier; a phosphor screen upon which electrons from said multiplier are incident; a photocathode adapted to receive illumination and to emit electrons to the electron multiplier; and a glass faceplate which supports the photocathode, the faceplate being as claimed in claim 11.
Claim 16
Independent Claim
224 words
A method of manufacturing a shielded faceplate for use in an image intensifier having a photocathode, said method including the steps of: providing a mold having an inner wall defining a cavity which symmetrically surrounds a vertical axis of said mold, the diameter of said cavity being greater at the upper end of said mold than at the lower end thereof, said mold being formed of a material to which glass does not bond; placing an opaque glass disc into said cavity, said opaque glass disc being made of a material which absorbs light to which said photocathode is sensitive; placing a transparent glass disc into said cavity with its lower surface adjacent the upper surface of said opaque glass disc, said transparent glass disc being made of a material which is transparent to light to which said photocathode is sensitive; heating said glass discs to a temperature at which said discs become soft; forcing said glass discs into contact with the inner walls of said mold, said glass discs thereby forming a block having a shape conforming to the shape of said cavity, an inner region consisting of glass transparent to light to which said photocathode is sensitive and an outer region consisting of glass which is opaque to light to which said photocathode is sensitive; and removing said block from said mold.
Claim 17
Independent Claim
224 words
A method of manufacturing a shielded faceplate for use in an image intensifier having a photocathode, said method including the steps of: providing a mold having an inner wall defining a cavity which symmetrically surrounds a vertical axis of said mold, the diameter of said cavity being greater at the upper end of said mold than at the lower end thereof, said mold being formed of a material to which glass does not bond; placing an opaque glass disc into said cavity, said opaque glass disc being made of a material which absorbs light to which said photocathode is sensitive; placing a transparent glass disc into said cavity with its lower surface adjacent the upper surface of said opaque glass disc, said transparent glass disc being made of a material which is transparent to light to which said photocathode is sensitive; heating said glass discs to a temperature at which said discs become soft; forcing said glass discs into contact with the inner walls of said mold, said glass discs thereby forming a block having a shape conforming to the shape of said cavity, an inner region consisting of glass transparent to light to which said photocathode is sensitive and an outer region consisting of glass which is opaque to light to which said photocathode is sensitive; and removing said block from said mold.
Claim 18
Dependent Claim
24 words
A method as defined in claim 13 wherein the thickness of said opaque glass disc is less than that of said transparent glass disc.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |