Drive device, LED array, LED head, and image forming apparatus provided therewith

An LED head comprising:

• an LED array provided with a plurality of LED elements in an array form, said LED array driven time-divisionally based on an input drive signal;
• and
• a drive device including an output terminal receiving input of a signal related to driving of said LED elements and a plurality of output terminals connected to said LED elements, for outputting said drive signal based on said signal input into said input terminal, wherein:
• said input terminal and said output terminals are arranged substantially in a line.

An LED array comprising:

• a second electrode array formed by arranging a plural number S of second electrodes at equal intervals L, said second electrodes each receiving input of a drive signal for light emitting elements output from a first electrode array composed of a plural number S of first electrodes arranged at equal intervals P;
• and
• a light emitting array formed by arranging said plural number S×N light emitting elements at equal intervals, said light emitting elements connected to said second electrodes N by N and driven based on said drive signal input into said second electrode array, wherein:
• said second electrode array and said light emitting array are formed in a manner to have a center of a unit of said second electrode array and said light emitting array corresponding to a center of said second electrode array and to have said intervals L between said plural number S of second electrodes satisfying an equation of L=(N−1)×P.

An LED head comprising:

• a drive device having a first electrode array composed of a plural number S of first electrodes in an array form at intervals P, for outputting a drive signal for light emitting elements;
• a second electrode array composed of a plural number S of second electrodes in an array form at intervals L, for receiving input of said drive signal for said light emitting elements output from said first electrode array;
• and
• an LED array having a light emitting array formed by arranging at equal intervals said plural number S×N of light emitting elements connected to said second electrode N by N, said light emitting elements driven based on said drive signal input into said second electrode array, wherein:
• said second electrode array and said light emitting element array are formed in a manner to have a center of a unit of said second electrode array and said light emitting element array corresponding to a center of said second electrode array and to have said intervals L between said plural number S of second electrodes satisfying an equation of L=(N−1)×P.

An LED array for driving time-divisionally a plural number N (N:

• multiples of four) of LED elements arranged at equal intervals and divided into four groups, said LED array comprising:
• a first electrode pad connected through a first wiring material to a first group of said LED elements composed of (1+n×4)-th (n:
• a positive integer) LED elements in an arbitrary direction of an array direction of said LED elements, said LED elements each having one side of electrodes connected to each other through said first wiring material;
• a second electrode pad connected through a second wiring material to a second group of said LED elements composed of (N−n×4)-th LED elements in said arbitrary direction, said LED elements each having one side of electrodes connected to each other through said second wiring material;
• a third electrode pad connected through a third wiring material to a third group of said LED elements composed of (3+n×4)-th LED elements in said arbitrary direction, said LED elements each having one side of electrodes connected to each other through said third wiring material;
• a fourth electrode pad connected through a fourth wiring material to said LED elements prior to N/2-th LED element, each having one side of electrodes connected through said fourth wiring material to each other in a fourth group composed of (2+n×4)-th LED element in said arbitrary direction;
• and
• a fifth electrode pad connected through a fifth wiring material to said LED elements subsequent to said N/2-th LED element, each having one side of electrodes connected through said fifth wiring material to each other in said fourth group, wherein:
• said first electrode pad to said fifth electrode pad form an electrode pad array arranged along said LED elements arranged in an array form, in order of said first electrode pad, said fourth electrode pad, said third electrode pad, said fifth electrode pad, and said second electrode pad, in said arbitrary direction;
• said first wiring material extends in a direction of said first electrode pad from connection between said first wiring material and a first LED element in said arbitrary direction from among said first group of said LED elements to connect said first electrode pad to said first group of said LED elements;
• said second wiring material is disposed between said first wiring material and said electrode pad array and extends in a direction of said second electrode pad from connection between said second wiring material and N-th LED element in said arbitrary direction from among said second group of said LED elements to connect said second electrode pad to said second group of said LED elements;
• said third wiring material is disposed between said second wiring material and said electrode pad array and extends in a direction of said third electrode pad from an interval between said fourth wiring material and said fifth wiring material to connect said third electrode pad to said third group of said LED elements;
• and
• said fourth wiring material and said fifth wiring material are disposed between said third wiring material and said electrode pad array.

An LED array for driving time-divisionally a plural number N (N:

• multiples of eight) of LED elements arranged at equal intervals and divided into eight groups, said LED array comprising:
• a first electrode pad connected through a first wiring material to a first group of said LED elements composed of (1+n×8)-th (n:
• a positive integer) LED elements in an arbitrary direction of an array direction of said LED elements, said LED elements each having one side of electrodes connected to each other through said first wiring material;
• a second electrode pad connected through a second wiring material to a second group of said LED elements composed of (N−n×8)-th LED elements in said arbitrary direction of said array direction of said LED elements, said LED elements each having one side of electrodes connected to each other through said second wiring material;
• a third electrode pad connected through a third wiring material to a third group of said LED elements composed of (2+n×8)-th LED elements in said arbitrary direction of said array direction of said LED elements, said LED elements each having one side of electrodes connected to each other through said third wiring material;
• a fourth electrode pad connected through a fourth wiring material to a fourth group of said LED elements composed of (N−1−n×8)-th LED elements in said arbitrary direction of said array direction of said LED elements, said LED elements each having one side of electrodes connected to each other through said fourth wiring material;
• a fifth electrode pad connected through a fifth wiring material to a fifth group of said LED elements composed of (3+n×8)-th LED elements in said arbitrary direction of said array direction of said LED elements, said LED elements each having one side of electrodes connected to each other through said fifth wiring material;
• a sixth electrode pad connected through a sixth wiring material to said LED elements prior to N/2-th LED element, each having one side of electrodes connected through said sixth wiring material to each other in a sixth group composed of (4+n×8)-th LED elements in said arbitrary direction of said array direction of said LED elements;
• a seventh electrode pad connected through a seventh wiring material to said LED elements subsequent to N/2-th LED element, each having one side of electrodes connected through said seventh wiring material to each other in said sixth group;
• an eighth electrode pad connected through an eighth wiring material to said LED elements prior to N/4-th LED element, each having one side of electrodes connected through said eighth wiring material to each other in said seventh group composed of (6+n×8)-th LED elements in said arbitrary direction of said array direction of said LED elements;
• a ninth electrode pad connected through a ninth wiring material to said LED elements subsequent to N/4-th LED element and prior to N/2-th LED element, each having one side of electrodes connected through said ninth wiring material to each other in said seventh group;
• a tenth electrode pad connected through a tenth wiring material to said LED elements subsequent to said N/4-th LED element and prior to said N/2-th LED element, each having one side of electrodes connected through said ninth wiring material to each other in said seventh group;
• an eleventh electrode pad connected through an eleventh wiring material to said LED elements subsequent to 3N/4-th LED element, each having one side of electrodes connected through said eleventh wiring material to each other in said seventh group;
• a twelfth electrode pad connected through a twelfth wiring material to said LED elements prior to N/8-th LED element, each having one side of electrodes connected through said twelfth wiring material to each other in an eighth group composed of (5+n×8)-th LED elements in said arbitrary direction of said array direction of said LED elements;
• a thirteenth electrode pad connected through a thirteenth wiring material to said LED elements subsequent to said N/8-th LED element and subsequent to said N/4-th LED element, each having one side of electrodes connected through said thirteenth wiring material to each other in said eighth group;
• a fourteenth electrode pad connected through a fourteenth wiring material to said LED elements subsequent to said N/4-th LED element and prior to 3N/8-th LED element, each having one side of electrodes connected through said fourteenth wiring material to each other in said eighth group;
• a fifteenth electrode pad connected through a fifteenth wiring material to said LED elements subsequent to said 3N/8-th LED element and prior to said N/2-th LED element, each having one side of electrodes connected through said fifteenth wiring material to each other in said eighth group;
• a sixteenth electrode pad connected through a sixteenth wiring material to said LED elements subsequent to said N/2-th LED element and prior to 5N/8-th LED element, each having one side of electrodes connected through said sixteenth wiring material to each other in said eighth group;
• a seventeenth electrode pad connected through a seventeenth wiring material to said LED elements subsequent to said 5N/8-th LED element and prior to said 3N/4-th LED element, each having one side of electrodes connected through said seventeenth wiring material to each other in said eighth group;
• and
• an eighteenth electrode pad connected through an eighteenth wiring material to said LED elements subsequent to said 3N/4-th LED element and prior to 7N/8-th LED element, each having one side of electrodes connected through said eighteenth wiring material to each other in said eighth group, wherein:
• said first electrode pad to said eighteenth electrode pad form an electrode pad array arranged along said LED elements in array form, in order of said first electrode pad, said third electrode pad, said eleventh electrode pad, said seventh electrode pad, said twelfth electrode pad, said fifth electrode pad, said thirteenth electrode pad, said eighth electrode pad, said fourteenth electrode pad, said fourth electrode pad, said fifteenth electrode pad, said ninth electrode pad, said sixteenth electrode pad, said sixth electrode pad, said seventeenth electrode pad, said tenth electrode pad, said eighteenth electrode pad, said third electrode pad, and said second electrode pad, in said arbitrary direction;
• said first wiring material extends in a direction of said first electrode pad from connection between said first wiring material and a first LED element in said arbitrary direction from among said first group of said LED elements to connect said first electrode pad to said first group of said LED elements;
• said second wiring material is disposed between said first wiring material and said electrode pad array and extends in a direction of said second electrode pad from connection between said second wiring material and N-th LED element in said arbitrary direction from among said second group of said LED elements to connect said second electrode pad to said second group of said LED elements;
• said third wiring material is disposed between said second wiring material and said electrode pad array and extends in a direction of said third electrode pad from connection between said third wiring material and a second LED element in said arbitral direction from among said third group of said LED elements to connect said third electrode pad to said third group of said LED elements;
• said fourth wiring material is disposed between said third wiring material and said electrode pad array and extends in a direction of said fourth electrode pad from connection between said fourth wiring material and a (N−1)-th LED element in said arbitral direction from among said fourth group of said LED elements to connect said fourth electrode pad to said fourth group of said LED elements;
• said fifth wiring material is disposed between said fourth wiring material and said electrode pad array and extends in a direction of said fifth electrode pad from an interval between said seventh wiring material and said eighth wiring material to connect said fifth electrode pad to said fifth group of said LED elements;
• said sixth wiring material is disposed between said fourth wiring material and said electrode pad array and extends in a direction of said sixth electrode pad from an interval between said ninth wiring material and said tenth wiring material to connect said sixth electrode pad to said fifth group of said LED elements;
• said seventh wiring material is disposed between said fifth wiring material and said electrode pad array and extends in a direction of said seventh electrode pad from an interval between said eleventh wiring material and said twelfth wiring material to connect said seventh electrode pad to said sixth group of said LED elements;
• said eighth wiring material is disposed between said fifth wiring material and said electrode pad array and extends in a direction of said eighth electrode pad from an interval between said thirteenth wiring material and said fourteenth wiring material to connect said eighth electrode pad to said sixth group of said LED elements;
• said ninth wiring material is disposed between said fifth wiring material and said electrode pad array and extends in a direction of said ninth electrode pad from an interval between said fifteenth wiring material and said sixteenth wiring material to connect said ninth electrode pad to said sixth group of said LED elements;
• said tenth wiring material is disposed between said fifth wiring material and said electrode pad array and extends in a direction of said tenth electrode pad from an interval between said seventeenth wiring material and said eighteenth wiring material to connect said tenth electrode pad to said sixth group of said LED elements;
• said eleventh wiring material and said twelfth wiring material are disposed between said seventh wiring material and said electrode pad array;
• said thirteenth wiring material and said fourteenth wiring material are disposed between said eighth wiring material and said electrode pad array;
• said fifteenth wiring material and said sixteenth wiring material are disposed between said ninth wiring material and said electrode pad array;
• and
• said seventeenth wiring material and said eighteenth wiring material are disposed between said tenth wiring material and said electrode pad array.