Optical print head and image forming apparatus using a rod lens with a predetermined conjugate length
US6717606B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 15, 2001 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | Nov 30, 2021 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41J2/451
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An optical print head of the present invention includes a light emitting element array having of a plurality of light emitting elements. A rod lens array has a plurality of rod lenses for focusing light output from the rod lenses on an image carrier in the form of beam spots. The rod lenses each have a conjugate length greater than a distance between the light emitting element array, which forms a x1 image, and the image carrier. The head of the present invention reduces the diameter of a beam spot and positions a beam waist close to the image carrier to thereby increase resolution. An image forming apparatus using the above head is also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.