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US 5,633,493 AGranted
Image tube having a YAG crystal
AssigneeHamamatsu Photonics K.K.
InventorsHideki Suzuki, Minoru Kondo, Yasushi Watase, Yoshihito Suzuki
Life of this patent
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Abstract
This image tube converts irradiated electrons into fluorescence by irradiating electrons converted from a light beam by a photocathode onto a YAG crystal member. Since the YAG crystal member is a single unitary solid, the fluorescence generated on the input surface of the YAG crystal member contains no fixed pattern noise.
Claims12
An apparatus for amplifying a light beam incident thereon to output the light beam, comprising:
- (A) a housing having first and second openings;
- (B) a transparent member for sealing the first opening, said transparent member having,
- (a) a light incidence surface applied with an atmospheric pressure, onto which the light beam is irradiated, and
- (b) a light exit surface opposing said light incidence surface, from which the light beam emerges;
- (C) a photocathode, fixed on said light exit surface, for converting the light beam into electrons;
- (D) an electron multiplier, opposing said photocathode, for multiplying the electrons incident thereon;
- and
- (E) a YAG crystal member for sealing the second opening, said YAG crystal member comprising a YAG crystal as a single unitary solid and having
- (a) an input surface opposing said electron multiplier and arranged in said housing, and
- (b) an output surface opposing said input surface and located outside said housing, on which an atmospheric pressure is applied.
7 more elements
An apparatus for amplifying a light beam incident thereon to output the light beam, comprising:
- (A) a housing;
- (B) a transparent member fixed to said housing, said transparent member having,
- (a) a light incidence surface onto which the light beam is irradiated, and
- (b) a light exit surface opposing said light incidence surface, from which the light beam emerges;
- (C) a photocathode, fixed on said light exit surface, for converting the light beam into electrons;
- (D) an electron multiplier, opposing said photocathode, for multiplying the electrons incident thereon;
- and
- (E) a YAG crystal member fixed to said housing, said YAG crystal member comprising a YAG crystal as a single unitary solid and having
- (a) an input surface opposing said electron multiplier and arranged in said housing, and
- (b) an output surface opposing said input surface and located outside said housing so that a distance from said input surface to said output surface of said YAG crystal member is larger than 10 mm and smaller than 14.2 mm.
7 more elements
Dependencies are inferred from the claim text.