TONER, TONER STORAGE UNIT, IMAGE FORMING APPARATUS, AND IMAGE FORMING METHOD

PROBLEM TO BE SOLVED: To provide a toner which prevents generation of an abnormal image caused by filming due to an external additive on a photoreceptor and can stably secure high image density, even when repeatedly used over a long period of time not only at normal temperature and normal humidity but also particularly in low temperature and low humidity environments.SOLUTION: There is provided a toner which contains toner base particles having a binder resin and at least two or more inorganic fine particles, where the inorganic fine particles are contained in an amount of 1.0 mass% to 3.5 mass% with respect to the toner base particles and when the toner collides with the substrate with the use of a vacuum distributor by a vacuum dispersion type image analyzing method, the number of isolated inorganic fine particles dispersed in the substrate formed from a carbon tape is 10 pieces or less per one particle of the toner, the number of isolated inorganic fine particles dispersed in the substrate formed from mica is 200 pieces to 1,800 pieces per one particle of the toner, and the number of isolated inorganic fine particles of 350 nm or more and 500 nm or less dispersed in the substrate formed from the mica is 50 pieces or less per one particle of the toner.SELECTED DRAWING: None 【課題】常温常湿だけでなく、特に低温低湿環境下において長期に渡って繰り返し使用しても感光体上の外添剤によるフィルミングに起因する異常画像が発生せず、高い画像濃度が安定して確保できるトナーの提供。【解決手段】結着樹脂を有するトナー母体粒子と、少なくとも２種類以上の無機微粒子とを含有するトナーであって、前記無機微粒子を前記トナー母体粒子に対して１．０質量％〜３．５質量％含有し、トナーを基板に衝突させる真空分散型画像解析法により真空分散器を用いて前記トナーを衝突させた場合、カーボンテープからなる前記基板に分散した前記無機微粒子の遊離数が前記トナー１粒子あたり１０個以下であり、マイカからなる前記基板に分散した前記無機微粒子の遊離数が前記トナー１粒子あたり２００個〜１，８００個であり、前記マイカからなる前記基板に分散した３５０ｎｍ以上５００ｎｍ以下の前記無機微粒子の遊離数が前記トナー１粒子あたり５０個以下であることを特徴とするトナーである。【選択図】なし