Modular optical printhead for hard copy printers
US4875057A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 1, 1988 |
| Grant date | Oct 17, 1989 |
| Priority date | — |
| Expiry date | Sep 1, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/451
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Modular optical LED printhead arranged for a fixed focus distance outside the printhead structure. A supporting and registration plate contains a rectangular opening in which the lens is located. The plate is secured to the overall LED supporting structure of the printhead by end members which, with side members, completely seal the LED's and connections from contaminants. The registration plate has at least two surfaces thereon which mate with surfaces in the associated apparatus to accurately position the plate. During the alignment process of the printhead, the lens and plate are adjusted to provide a focus at a fixed distance from one of the registration surfaces of the plate. Alignment of the lens across the axis of the LED array is provided by recessed set screws and a shim. Because of the fixed distance from the registration surface, the printhead can be installed in suitably constructed apparatus without further alignment.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.