EP0225697A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
ELectric image printer
Assignee: Seiko Instruments Inc
•
Filing: 1986-10-09
•
Granted: —
•
Expires: 2006-10-09
Abstract
Abstract An image printer comprises a printing head (2) having printing dots arranged in a line, print drive circuitry (7) for driving the printing dots grouped into a plurality of blocks, and a stepping motor (9) for feeding recording medium. An area gradation circuit (1) selects a required number of dots in a picture element constituted by an m x n matrix wich consists of m dots in the line direction and n dots in the feed direction. A concentration gradation circuit (1) selects a repetition rate for printing selected dots.
Inventors
- 👤 Kei C/O Seiko Instruments Nonaka
- 👤 Yasushi C/O Seiko Instruments Tanigaki
- 👤 Kouichi C/O Seiko Instruments Yokosuka
- 👤 Shinji C/O Seiko Instruments Nureki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:03
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/40; H04N1/40025; H04N1/40031; H04N1/40043; H04N1/405; H04N1/4055; H04N1/4057
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
An image printer characterised by comprising: a printing head (2) having a plurality of printing dots arranged in line, a print drive circuit (7) for driving the printing dots grouped into a plurality of blocks; a stepping motor (9) for feeding recording medium; an area gradation means (1) for selecting a required number of dots in a picture element constituted by an m × n matrix which consists of m dots in the line direction and n dots in the feed direction, and a concentration gradation means (1) for selecting a repetition rate of printing selected dots.
Claim 2
Dependent Claim
97 words
An image printer characterised by comprising: a printing head (2) having a plurality of printing dots arranged in line, a print drive circuit (7) for driving the printing dots grouped into a plurality of blocks; a stepping motor (9) for feeding recording medium; an area gradation means (1) for selecting a required number of dots in a picture element constituted by an m × n matrix which consists of m dots in the line direction and n dots in the feed direction, and a concentration gradation means (1) for selecting a repetition rate of printing selected dots.
Claim 3
Dependent Claim
36 words
An image printer as claimed in claim 1 characterised in that said print drive circuit (7) is arranged to correct print output energy of each block depending upon the number of output dots of each block.
Claim 4
Dependent Claim
32 words
An image printer as claimed in claim 1 or 2 characterised in that the arrangement is such that, in operation, output energy levels during said selected repetition are different from one another.
Claim 5
Dependent Claim
92 words
An image printer comprising, a printing heads having a plurality of printing dots stood in line; a print drive circuit which drives said printing heads by grouping them into a plurality of blocks; a step motor for feeding a paper; an area gradation means selecting a required number of dots in a picture element constituted by an m × n matrix which consists of m dots in the line direction and n dots in the feed direction; and a concentration gradation means for selecting a repetition times of printing a selected dots.
Claim 6
Dependent Claim
92 words
An image printer comprising, a printing heads having a plurality of printing dots stood in line; a print drive circuit which drives said printing heads by grouping them into a plurality of blocks; a step motor for feeding a paper; an area gradation means selecting a required number of dots in a picture element constituted by an m × n matrix which consists of m dots in the line direction and n dots in the feed direction; and a concentration gradation means for selecting a repetition times of printing a selected dots.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.