Title:
INK TYPE IMAGE FORMING DEVICE
Document Type and Number:
WIPO Patent Application WO/1997/014563
Kind Code:
A1
Abstract:
An ink type image forming device which accurately identifies a print pattern (test pattern) even in the case where a recording medium is somewhat raised or the recording medium is low in reflectance in an attempt to find a deviation in relative position of recording heads. When the output of a light receiving element (22) is substracted from the output of a light receiving element (21), both the outputs are offset by each other since variations in output are small at an area where the recording medium is raised. In the meantime, the light receiving elements are spaced in the direction (X) of movement of a carriage, and the output of the light receiving element corresponding to respective areas which constitute the print pattern steeply changes. As a result, a peak signal corresponding to the respective areas of the print pattern is obtained as a difference signal of outputs of the light receiving elements (fig. 8 (d)). Accordingly, even if the recording medium happens to be raised, positions where the respective areas of the print pattern are existant can be positively detected.
Inventors:
MATSUDA YUJI (JP)
Application Number:
PCT/JP1996/003005
Publication Date:
April 24, 1997
Filing Date:
October 17, 1996
Export Citation:
Assignee:
COPYER CO (JP)
MATSUDA YUJI (JP)
MATSUDA YUJI (JP)
International Classes:
B41J2/01; B41J2/21; B41J25/304; B41J29/393; (IPC1-7): B41J2/21; B41J2/01
Foreign References:
| JPH03234534A | 1991-10-18 | |||
| JPS58195111A | 1983-11-14 | |||
| JPS62206403A | 1987-09-10 | |||
| JPH07323582A | 1995-12-12 |
Other References:
See also references of EP 0858897A4
PATENT ABSTRACTS OF JAPAN
PATENT ABSTRACTS OF JAPAN
PATENT ABSTRACTS OF JAPAN
PATENT ABSTRACTS OF JAPAN
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