Stabilization of prepare voltage of transmission storage target

Claim 3

A method in accordance with claim 1 in which the stabilization pulses are repetitive pulses of substantially rectangular waveform.

Claim 4

A method in accordance with claim 2 in which the stabilization pulses have a greater frequency at the start of preparation of the target than the frequency during the remainder of such preparation.

Claim 5

A method in accordance with claim 1 in which the storage tube also includes a second storage target and the flood electrons transmitted through the written areas of the first mentioned target are caused to bombard the storage dielectric of said second target in order to transfer the charge image from the first target to the second target.

Claim 6

A method in accordance with claim 4 in which the second storage target is also a transmission mesh target and the flood electrons are transmitted through the written charge image areas of the second target to a separate phosphor screen which emits a light image corresponding to the charge image.

Claim 7

A transmission storage tube apparatus in which the improvement comprises: a transmission mesh storage target including a mesh target electrode and a storage dielectric layer provided on said target electrode leaving open the mesh apertures; flood means including a cathode for bombarding said storage dielectric layer substantially uniformly with low velocity flood electrons to charge the bombarded surface of said dielectric to a prepare voltage which prepares the target for writing thereon; pulse application means for applying a pulse train including a plurality of successive stabilization pulses between said target electrode and said flood electron cathode during the preparation bombardment of said dielectric by said flood electrons, said pulses each having a maximum voltage sufficient To make the secondary emission ratio of said dielectric greater than unity for the flood electrons, the quiescent voltage of said pulses being a smaller voltage where said ratio is less than unity, and said pulses having a pulse width and spacing such that said prepare voltage is stabilized at a substantially constant value which is positive with respect to the cutoff voltage of said target and where said ratio is less than unity thereby enabling the flood electrons to continue to strike said dielectric to maintain said prepare voltage substantially uniformly over the surface of said dielectric layer; a collector electrode for collecting the secondary electrons emitted by said dielectric; and writing means including a cathode for bombarding the stabilized storage dielectric with high velocity writing electrons at voltages where the secondary emission ratio of the dielectric is greater than unity, to write a charge image on said dielectric layer when said prepare voltage is stabilized.

Claim 8

A transmission storage tube apparatus in which the improvement comprises: a transmission mesh storage target including a mesh target electrode and a storage dielectric layer provided on said target electrode leaving open the mesh apertures; flood means including a cathode for bombarding said storage dielectric layer substantially uniformly with low velocity flood electrons to charge the bombarded surface of said dielectric to a prepare voltage which prepares the target for writing thereon; pulse application means for applying a pulse train including a plurality of successive stabilization pulses between said target electrode and said flood electron cathode during the preparation bombardment of said dielectric by said flood electrons, said pulses each having a maximum voltage sufficient To make the secondary emission ratio of said dielectric greater than unity for the flood electrons, the quiescent voltage of said pulses being a smaller voltage where said ratio is less than unity, and said pulses having a pulse width and spacing such that said prepare voltage is stabilized at a substantially constant value which is positive with respect to the cutoff voltage of said target and where said ratio is less than unity thereby enabling the flood electrons to continue to strike said dielectric to maintain said prepare voltage substantially uniformly over the surface of said dielectric layer; a collector electrode for collecting the secondary electrons emitted by said dielectric; and writing means including a cathode for bombarding the stabilized storage dielectric with high velocity writing electrons at voltages where the secondary emission ratio of the dielectric is greater than unity, to write a charge image on said dielectric layer when said prepare voltage is stabilized.

Claim 9

An apparatus in accordance with claim 6 in which the pulse application means applies repetitive stabilization pulses of rectangular waveform to the target electrode.

Claim 10

An apparatus in accordance with claim 7 in which said pulses are of a greater frequency at the start of the preparation of the target than at the end of such preparation.

Claim 11

An apparatus in accordance with claim 6 in which the storage tube also includes a storage target and a transfer means for causing flood electrons to be transmitted through the written areas of the first mentioned target to bombard the storage dielectric of said second target in order to transfer the charge image from said first target to said second target.

Claim 12

An apparatus in accordance with claim 9 in which the second storage target is also a transmission mesh target and the flood electrons are transmitted through the written charge image areas of the second target to a separate phosphor screen which emits a light image corresponding to the charge image.