Copy contrast and density control

Claim 2

Copy solid area, contrast and density adjusting apparatus for use in a copier having a chargeable photoconductor, adjustable charging means for varying the voltage Vo applied onto the photoconductor, an adjustable exposure station for varying the copier exposure Eo, and a development station having at least one electrode and adjustable bias means for applying an adjustable bias voltage V B to said electrode for establishing a bias voltage between the photoconductor and said development station to affect copy solid area density; said apparatus comprising: (a) memory means having stored therein a matrix of sets of representations of interrelated electrical values, with each such set having values which correspond to specific levels of Vo, Eo, and V B that define a particular solid area copier Din/Dout response curve with a predetermined breakpoint; (b) means for addressing said matrix to designate a particular set; and (c) logic and control means responsive to the values of said designated set to adjust said adjustable charging means, said adjustable bias means and said adjustable exposure station to produce copies in accordance with the Din/Dout response curve defined by such designated set values.

Claim 3

Copy solid area, contrast and density adjusting apparatus for use in a copier having a chargeable photoconductor, adjustable charging means for varying the voltage Vo, applied onto the photoconductor, an adjustable exposure station for varying the copier exposure Eo, and a development station having at least one electrode and adjustable bias means for applying an adjustable bias voltage V B to said electrode for establishing a bias voltage between the photoconductor and said development station to affect copy solid area density; said apparatus comprising: (a) memory means having stored therein a matrix of sets of representations of interrelated electrical values, with such matrix having a plurality of columns and plurality of rows wherein at the intersection of each column and row there is a set of values which correspond to specific levels of Vo, Eo, and V B that define a particular solid area copier Din/Dout response curve with a predetermined breakpoint; (b) means for addressing a particular column and a particular row of such matrix to designate the set located at their intersection; and (c) logic and control means responsive to the values of said designated set to adjust said exposure station, said charging means, and said adjustable bias means respectively to thereby optimize copy solid area contrast and density.

Claim 4

Copy solid area, contrast and density adjusting apparatus for use in a copier having a chargeable photoconductor, adjustable charging means for varying the voltage Vo, applied onto the photoconductor, an adjustable exposure station for varying the copier exposure Eo, and a development station having at least one electrode and adjustable bias means for applying an adjustable bias voltage V B to said electrode for establishing a bias voltage between the photoconductor and said development station to affect copy solid area density; said apparatus comprising: (a) memory means having stored therein a matrix of sets of representations of interrelated electrical values, with such matrix having a plurality of columns and plurality of rows wherein at the intersection of each column and row there is a set of values which correspond to specific levels of Vo, Eo, and V B that define a particular solid area copier Din/Dout response curve with a predetermined breakpoint; (b) means for addressing a particular column and a particular row of such matrix to designate the set located at their intersection; and (c) logic and control means responsive to the values of said designated set to adjust said exposure station, said charging means, and said adjustable bias means respectively to thereby optimize copy solid area contrast and density.

Claim 5

Copy solid area, contrast and density adjusting apparatus for use in a copier having a chargeable photoconductor, adjustable charging means for varying the voltage Vo, applied onto the photoconductor, an adjustable exposure station for varying the copier exposure Eo, and a development station having at least one electrode and adjustable bias means for applying an adjustable bias voltage V B to said electrode for establishing a bias voltage between the photoconductor and said development station to affect copy solid area density; said apparatus comprising: (a) a stored matrix of sets of representations of interrelated electrical values, with such matrix having a plurality of columns and plurality of rows wherein at the intersection of each column and row there is a set having values which correspond to specific levels of Vo, Eo, and V B that define a particular copier solid area Din/Dout responsive curve having a predetermined breakpoint, and wherein the Din/Dout response curve corresponding to a set in any row position of a particular matrix column is substantially identical in shape but has a different breakpoint; (b) means for addressing a particular column and a particular row of such matrix to designate the set located at their intersection; and (c) logic and control means responsive to the values of said designated set to adjust said exposure station, said charging means, and said adjustable bias means respectively to thereby optimize copy solid area contrast and density.

Claim 6

Copy solid area, contrast and density adjusting apparatus for use in a copier having a chargeable photoconductor, adjustable charging means for varying the voltage Vo, applied onto the photoconductor, an adjustable exposure station for varying the copier exposure Eo, and a development station having at least one electrode and adjustable bias means for applying an adjustable bias voltage V B to said electrode for establishing a bias voltage between the photoconductor and said development station to affect copy solid area density; said apparatus comprising: (a) a stored matrix of sets of representations of interrelated electrical values, with such matrix having a plurality of columns and plurality of rows wherein at the intersection of each column and row there is a set having values which correspond to specific levels of Vo, Eo, and V B that define a particular copier solid area Din/Dout responsive curve having a predetermined breakpoint, and wherein the Din/Dout response curve corresponding to a set in any row position of a particular matrix column is substantially identical in shape but has a different breakpoint; (b) means for addressing a particular column and a particular row of such matrix to designate the set located at their intersection; and (c) logic and control means responsive to the values of said designated set to adjust said exposure station, said charging means, and said adjustable bias means respectively to thereby optimize copy solid area contrast and density.

Claim 7

The invention as set forth in claim 3 wherein the Din/Dout responsive curve for each row position of a matrix column is substantially identical in shape but has a different breakpoint.

Claim 10

The invention as set forth in claim 5, including the step of choosing a smaller array within the matrix array from which sets can be designated.

Claim 11

Copy, line and solid area, contrast and density adjusting apparatus for use in a copier having a chargeable photoconductor, adjustable charging means for varying the voltage Vo applied onto the copier photoconductor, an adjustable exposure station for varying the exposure Eo, and a dual magnetic brush development station with developer and transport rollers, said apparatus comprising: (a) adjustable bias means for applying an adjustable bias voltage V B to said developer roller for establishing a voltage between such roller and the photoconductor to affect copy solid area density; (b) means for applying a predetermined bias voltage to said transport roller for establishing a voltage between such transport roller and the photoconductor to affect line copy density; (c) memory means having stored therein a matrix of sets of representations of interrelated electrical values, with such matrix having a plurality of columns and plurality of rows wherein at the intersection of each column and row there is a set having values which correspond to specific levels of Vo, Eo, and V B that define a particular copier Din/Dout response solid area, curve with a predetermined breakpoint; (d) means for addressing a particular column and a particular row of such matrix to designate the set located at their intersection; and (e) logic and control means responsive to the values of said designated set to adjust said exposure station, said charging means, and said adjustable bias means respectively to thereby optimize copy solid area contrast and density.

Claim 12

Copy, line and solid area, contrast and density adjusting apparatus for use in a copier having a chargeable photoconductor, adjustable charging means for varying the voltage Vo applied onto the copier photoconductor, an adjustable exposure station for varying the exposure Eo, and a dual magnetic brush development station with developer and transport rollers, said apparatus comprising: (a) adjustable bias means for applying an adjustable bias voltage V B to said developer roller for establishing a voltage between such roller and the photoconductor to affect copy solid area density; (b) means for applying a predetermined bias voltage to said transport roller for establishing a voltage between such transport roller and the photoconductor to affect line copy density; (c) memory means having stored therein a matrix of sets of representations of interrelated electrical values, with such matrix having a plurality of columns and plurality of rows wherein at the intersection of each column and row there is a set having values which correspond to specific levels of Vo, Eo, and V B that define a particular copier Din/Dout response solid area, curve with a predetermined breakpoint; (d) means for addressing a particular column and a particular row of such matrix to designate the set located at their intersection; and (e) logic and control means responsive to the values of said designated set to adjust said exposure station, said charging means, and said adjustable bias means respectively to thereby optimize copy solid area contrast and density.