EP0089722A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Display tube
Assignee: Koninklijke Philips NV
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Filing: 1983-03-17
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Granted: —
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Expires: 2003-03-17
Abstract
Abstract The display window (11) of a display tube is manufactured from a plate (21) having grooves (22), which plate is fused to a plate (20), so that ducts (25) are present in the display window (11). The phosphor screen (14) is present on the inside of plate (20). The ducts (25) communicate at one end with a common supply duct (26) having an inlet aperture (27) and communicate at the other end with a common exhaust duct (28) having an outlet aperture (29). A coolant is forced through the ducts (25) for cooling the phosphor screen (14).
Inventors
- 👤 Johannes Van Esdonk
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 08:25
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/24; H01J29/006; H01J29/86; H01J29/861
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
A display tube comprising a glass envelope having a substantially rectangular display window provided with a phosphor screen, in which window are means present at a short distance from the phosphor screen to cool the screen by means of a coolant, characterized in that the display window is formed by two plates fused together and that the means are formed by grooves provided in one of the plates on the side facing the other plate, which grooves extend substantially parallel to one of the rectangular sides of the display / window and one end of which communicates with a common supply duct and the other end of which communicates with a common exhaust duct for the coolant.
Claim 2
Dependent Claim
117 words
A display tube comprising a glass envelope having a substantially rectangular display window provided with a phosphor screen, in which window are means present at a short distance from the phosphor screen to cool the screen by means of a coolant, characterized in that the display window is formed by two plates fused together and that the means are formed by grooves provided in one of the plates on the side facing the other plate, which grooves extend substantially parallel to one of the rectangular sides of the display / window and one end of which communicates with a common supply duct and the other end of which communicates with a common exhaust duct for the coolant.
Claim 3
Dependent Claim
26 words
A display tube as claimed in Claim 1, characterized in that the grooves are substantially trapezoidal in a cross-section at right angles to the longitudinal direction.
Claim 4
Dependent Claim
26 words
A display tube as claimed in Claim 1, characterized in that the grooves are substantially sinusoidal in a cross-section at right angles to the longitudinal direction.
Claim 5
Dependent Claim
36 words
A display tube as claimed in Claim 1, 2 or 3, characterized in that the coolant has a refractive index which is equal to the refractive index of the glass plate which is provided with grooves.
Claim 6
Dependent Claim
39 words
A display tube, as claimed in Claim 1, 2, 3 or 4, characterized in that tne plate on which the phosphor screen is provided is manufactured from X-ray-transmissive glass and that the other plate is manufactured from X-ray-absorbing glass.
Claim 7
Dependent Claim
26 words
A display tube as claimed in Claim 1, 2, 3, 4 or 5, characterized in that the plate remote from the phosphor screen forms a lens.
Claim 8
Dependent Claim
29 words
A display tube as claimed in any one of the preceding Claims, characterized in that the plate on which the phosphor screen is provided is manufactured from grey-tinted glass.
Claim 9
Dependent Claim
27 words
A display tube as claimed in anyone of the preceding Claims, characterized in that the phosphor screen is formed by phosphors luminescing in at least one colour.
Claim 10
Dependent Claim
16 words
A projection television device comprising at least one display tube as claimed in any preceding Claim.
References Cited (Backward Citations)
GB417435A
Cited
GB513739A
Cited
GB527843A
Cited
GB1208018A
Cited
GB1305000A
Cited
DE2114058A1
Cited
GB2020842A
Cited
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