Abstract: The present invention relates to a photodetector that has a structure capable of realizing a wide range gain adjustment for each of electron multiplier channels respectively assigned to a plurality of light incidence regions of a multi-anode multiplier. The photodetector comprises a multi-anode photomultiplier, and a bleeder circuit unit. The multi-anode multiplier has a dynode unit constituted by N (an integer or no less than 3) dynode plates, and n-th (an integer of no less then 2) dynode plate is constituted by a plurality of control plates respectively corresponding to the multiplier channels. The bleeder circuit unit has a primary section setting each potential of a first to (n?1)-th and (n+1)-th to N-th dynode plates, and a secondary section for individually setting a potential of each control plate at any potential within the range wider than a potential difference between the (n?1)-th and (n+1) dynode plates.

Abstract: The present invention relates to a photodetector that has a structure capable of realizing a wide range gain adjustment for each of electron multiplier channels respectively assigned to a plurality of light incidence regions of a multi-anode multiplier. The photodetector comprises a multi-anode photomultiplier, and a bleeder circuit unit. The multi-anode multiplier has a dynode unit constituted by N (an integer or no less than 3) dynode plates, and n-th (an integer of no less then 2) dynode plate is constituted by a plurality of control plates respectively corresponding to the multiplier channels. The bleeder circuit unit has a primary section setting each potential of a first to (n?1)-th and (n+1)-th to N-th dynode plates, and a secondary section for individually setting a potential of each control plate at any potential within the range wider than a potential difference between the (n?1)-th and (n+1) dynode plates.

Abstract: The present invention relates to a photomultiplier that can realize a gain adjustment for each of electron multiplier channels respectively assigned to a plurality of light incidence regions in a more compact structure. The photomultiplier has a sealed container, and a photocathode, a dynode unit, and plurality of anodes prepared for electron multiplier channels are housed in the sealed container. The dynode unit is constituted by N (an integer or no less than 3) dynode plates, each provided with an electron multiplier hole for the associated channel, concerning all channels. In particular, the n-th (an integer of no less then 2) dynode plate is constituted by a plurality of control plates, each having an electron multiplier hole for the associated channel, and electrically and physically separated from the others. These control plates are supported in state of being supported, via insulators, by the (n?1)-th dynode plate and the (n+1)-th dynode plate.

Abstract: A bulb socket in which a positive terminal and an earth terminal are embedded in a socket body during the injection molding which body having a bulb insertion hole and a connector connection hole. The bulb socket is provided with a mold insertion space portion formed between a peripheral wall of the socket body constituting the bulb insertion hole and a bulb contact hole of the earth terminal.

Abstract: A connector socket for a wedge-base lamp is improved by socket structures which aid in leading the base end of the bulb into alignment with the insertion channel and at the same time prevent contact between the base end and the top ends of the socket terminals in a way which might lead to wrenching or deformation of the terminals.