| 摘要 |
A luminescent screen free of binder material is produced in an electron discharge device by introducing into the envelope of the electron discharge device a suspension of a phosphor in a settling liquid in which a relatively small proportion of a swellable organic colloid is distributed which is capable of being decomposed with complete volatilization. The phosphor of the suspension is then allowed to settle in the envelope so as to form therein a phosphor layer which will include a portion of the settling liquid and the colloid. The settling liquid is then removed and the residual layer is heated in the envelope at an elevated temperature and for a period of time sufficient to cause volatilization of the colloid so that a phosphor layer remains which is free of binder material.
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