To provide a photoelectric cathode, an electron tube, and a photomultiplier tube having a structure to dramatically improve the effective quantum efficiency.
The photoelectric cathodes 1A and 1B respectively comprise a supporting substrate 100 to transmit or block incident light, a photoelectron emitting layer 300 containing an alkaline metal and provided on the supporting substrate 100, and an underlayer 200 provided between the supporting substrate 100 and the photoelectron emitting layer 300. Particularly, the underlayer 200 contains a beryllium oxide and the thickness of the layer is controlled so that the ratio of the thickness of the priming layer 200 and is adjusted in its thickness such that a thickness ratio of the underlayer to the photoelectron emitting layer 300 falls within a specific range. This structure allows to obtain a photocathodes 1A and 1B having a dramatically-improved quantum efficiency.
YAMASHITA SHINICHI
WATANABE HIROYUKI
JPS56147352A | 1981-11-16 | |||
JPH0896705A | 1996-04-12 | |||
JPS5755048A | 1982-04-01 | |||
JPH09199075A | 1997-07-31 | |||
JPH11297191A | 1999-10-29 | |||
JPH11135003A | 1999-05-21 | |||
JPS56147352A | 1981-11-16 | |||
JPH0896705A | 1996-04-12 | |||
JPS5755048A | 1982-04-01 | |||
JPH09199075A | 1997-07-31 | |||
JPH11297191A | 1999-10-29 |
WO2004066338A1 | 2004-08-05 | |||
WO2004066338A1 | 2004-08-05 |
Shiro Terasaki
Satoru Ishida