Television camera tube
AssigneeU.S. Philips Corporation
InventorNicolaas Hendrik Limper
Life of this patent
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Abstract
A television camera tube is provided with means for background illumination including a light distributor which is accommodated in a space between the anode sleeve and an auxiliary light shielding cylinder which coaxially projects into the anode sleeve and which extends beyond the light distributor so far that the central portion of the target is in a half-shadow.
Claims12
A television camera tube having, in an evacuated envelope, a photosensitive target, an electron gun assembly, an anode sleeve extending between the target and the gun assembly, and means for the auxiliary illumination of the target, said auxiliary illuminating means comprising a light source, a hollow light shielding cylinder located within said anode sleeve to define an annular space between its outer wall and an inner wall portion of said sleeve, an annular light distributor disposed within said annular space at such a distance from the end of the shielding cylinder facing said target as to produce a non-uniform illumination of said target, and means for conducting light from said light source to the distributor in the annular space section remote from said target.
Dependencies are inferred from the claim text.