Abstract The envelope of the image intensifier is principally a glass cylinder closed at one end to support the viewing screen and having a sealing land at the other end with a series of apertures spaced thereabout. This end of the envelope is closed by a glass cap secured to the sealing land by a glass to glass seal. The photocathode has a supporting frame dimensioned to be positioned within the principal envelope section and having threaded mounting bushings in radial alignment with the apertures in the sealing land of the envelope, respectively. Mounting pins inserted through the openings of the envelope thread into these bushings and mechanically secure the photocathode in position. Each pin is sealed to the envelope in a vacuum-tight seal. In manufacturing the image intensifier three tubulations are affixed to the envelope, being spaced about the viewing screen thereof, and a fixture having three tines is inserted through these tubulations into the envelope and advanced toward the sealing land. The pickup pack is rested on the ends of these tines and the fixture is then withdrawn to draw the pickup pack away from the sealing land where it remains until the cap is sealed to the principal envelope section. Thereafter, the fixture is advanced once more to bring the mounting bushings of the pickup pack into alignment with the apertures on the sealing land for the purpose of receiving the mounting pins.
An image intensifier comprising: an envelope which is closed at both ends and has a viewing window at one end; a clamping element disposed about the periphery of and attached to said window and having a bead which is spaced from said window in the direction of the opposite end of said envelope; an anode having a cylindrical section at one end and a flared conical section at the other end, said conical section having a resilient termination carrying an inwardly disposed bead dimensioned to releasably engage said bead of said clamping element to attach said anode in position within said envelope; and a phosphor-coated screen positioned within said termination of said conical section of said anode in juxtaposition to said viewing window.
Claim 2
Dependent Claim
123 words
An image intensifier comprising: an envelope which is closed at both ends and has a viewing window at one end; a clamping element disposed about the periphery of and attached to said window and having a bead which is spaced from said window in the direction of the opposite end of said envelope; an anode having a cylindrical section at one end and a flared conical section at the other end, said conical section having a resilient termination carrying an inwardly disposed bead dimensioned to releasably engage said bead of said clamping element to attach said anode in position within said envelope; and a phosphor-coated screen positioned within said termination of said conical section of said anode in juxtaposition to said viewing window.
Claim 3
Dependent Claim
50 words
An image intensifier in accordance with claim 1 in which said resilient termination of said anode has an annular recess adjacent said inwardly disposed bead and in which said screen has a frame with resilient fingers for engaging a wall of said recess to bias said screen against said window.
Claim 4
Dependent Claim
34 words
An image intensifier in accordance with claim 1 in which said conical section of said anode is a light shield which minimizes light feedback from said screen toward said other end of said envelope.