| US 7,474,051 B2 | ||
| Alkali metal generating agent, alkali metal generator, photoelectric surface, secondary electron emission surface, electron tube, method for manufacturing photoelectric surface, method for manufacturing secondary electron emission surface, and method for manufacturing electron tube | ||
| Hiroyuki Sugiyama, Hamamatsu (Japan); Yoshiro Akai, Hamamatsu (Japan); and Shirou Sakai, Hamamatsu (Japan) | ||
| Assigned to Hamamatsu Photonics K.K., Hamamatsu-shi, Shizuoka (Japan) | ||
| Appl. No. 10/538,642 PCT Filed Jan. 16, 2004, PCT No. PCT/JP2004/000294 § 371(c)(1), (2), (4) Date Jun. 10, 2005, PCT Pub. No. WO2004/066337, PCT Pub. Date Aug. 05, 2004. |
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| Claims priority of application No. 2003-010012 (JP), filed on Jan. 17, 2003. | ||
| Prior Publication US 2006/0055322 A1, Mar. 16, 2006 | ||
| Int. Cl. H01J 40/06 (2006.01) | ||
| U.S. Cl. 313—542 [313/103 R] | 68 Claims |
| 1. An alkali metal generating agent as a supply source of an alkali metal used in formation of a photo-cathode for emitting
a photoelectron corresponding to incident light or a secondary-electron emitting surface for emitting secondary electrons
corresponding to an incident electron, said alkali metal generating agent comprising:
an oxidizer comprising at least one tungstate with an alkali metal ion as a counter cation; and
a reducer for initiating a redox reaction with the oxidizer at a predetermined temperature to reduce the alkali metal ion,
wherein the substance amount ratio of the reducer with respect to the tungstate is 1.9 or more but 50.1 or less.
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