Patent ID: 11971676
Assignee: KYOCERA DOCUMENT SOLUTIONS INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An image density measurement method in an image forming apparatus including
a printing portion which includes a plurality of rotating members related to formation of toner images and is capable of forming a test toner image on a surface of a photoconductor, and
a density sensing portion capable of sequentially sensing an image density of a portion of the test toner image, that passes through a predetermined sensing position,
the image density measurement method comprising:
deriving, by a processor, a plurality of unit density values which are each an average value of sensing densities sensed by the density sensing portion for each of a plurality of unit areas sectioned for each unit length in a sub scanning direction in the test toner image; and
deriving, by the processor, a weighted average of the plurality of unit density values to derive a test image density used for adjusting a control parameter in the printing portion,
wherein
the unit length is a greatest common factor of two target lengths corresponding to perimeters of two types of target rotating members out of the plurality of rotating members,
when a number of the plurality of unit areas is represented by n, n is a value obtained by subtracting 1 from an added value of a first constant and a second constant, and
the first constant and the second constant are values obtained by respectively dividing the two target lengths by the unit length.