Carrier - Carrier

Japanese: キャリア（担体） - きゃりあ

...also called carriers, they can be classified as (1) a substance that carries something, (2) a substance that holds something, or (3) a substance that is added to something. In the sense of (1), it refers to a charged particle or quasi-particle that is responsible for electrical conduction. ...

From [Electronic Photography]

...In the two-component development method, a developer made of a mixture of colored fine powder (toner, a resin powder with a diameter of 8 to 15 μm to which carbon black is mainly added as a colorant) and a carrier (metal or magnetic balls with a diameter of 20 to 500 μm, the surface of which is coated with resin or the like) that gives the desired electrostatic charge by frictional charging is contacted with the electrostatic latent image, and only the toner adheres (there are cascade development method, magnetic brush development method, etc.). In the one-component development method, a carrier is not used, and the toner is charged by frictional charging, charge induction, corona discharge method, etc. (there are one-component magnetic brush method, open chamber method, etc.) ...

From [Semiconductors]

...In other words, both conduction electrons and holes contribute to electrical conduction. Together, they are called carriers. The number of carriers increases rapidly with increasing temperature, and electrical conductivity also increases rapidly. ...

*Some of the terminology that mentions "carrier" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…キャリアともいい，(1)何かをになう物質，(2)何かを保持する物質，(3)何かに添加する物質にわけられる。(1)の意味では，電気伝導をになう荷電粒子や準粒子のこと。…

【電子写真】より

…2成分現像方式では，着色微粉末(トナーtoner。着色剤としておもにカーボンブラックが添加された直径8～15μmの樹脂粉末)と，これに摩擦帯電により所望の静電荷を与えるキャリアcarrier(表面を樹脂などで被覆された直径20～500μmの金属球または磁性体球)を混合した現像剤が静電潜像に接触し，トナーのみが付着する(カスケード現像法，磁気ブラシ現像法などがある)。1成分現像方式ではキャリアを用いずに，摩擦帯電，電荷誘導，コロナ放電法などによりトナーに電荷を与え現像する(1成分磁気ブラシ法，オープンチャンバー法などがある)。…