Light emission intensity width compensating method of LED print head and apparatus thereof
US5774165A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1995 |
| Grant date | Jun 30, 1998 |
| Priority date | — |
| Expiry date | Aug 21, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/45
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
The present invention is a light emission intensity width compensating method of an optical print head having a large number of light emitting devices, comprising the steps of measuring a light emission intensity distribution of each of the light emitting devices of the optical print head, slicing the distribution corresponding to a reference light emission intensity value, calculating a light emission intensity width of the reference light emission intensity value for each of the light emitting devices, designating a compensation value of drive energy so that each of the light emission intensity widths becomes equal, and causing each light emitting device to emit light corresponding to the compensation value of the drive energy. In addition, the present invention is an apparatus corresponding to the light emission intensity compensating method. The compensation values of the drive energy are stored in a storing means of the apparatus. When data is printed, the light emitting devices of the optical print head are lit corresponding to the compensation value of the drive energy. Thus, the drive energy is varied corresponding to the light emission intensity width. Consequently, a dot …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.