Lamp unit and image reading apparatus using the same
US6222647A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1997 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Jun 11, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N1/02885
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Concerning a lamp unit which is used as a light source of an image reading apparatus, there is provided a lamp unit which reduces a change over time in the quantity of light. The lamp unit is provided with a hollow cylindrical gas-filled tube in which a gas is filled; a pair of electrodes which are secured to an outer peripheral surface of the gas-filled tube and extend in the longitudinal direction of the gas-filled tube in a mutually opposing state; an electrically insulating cladding tube surrounding the electrodes and the gas-filled tube; and a heat-accumulating member provided in contact with an outer peripheral surface of the cladding tube and extending in the longitudinal direction of the cladding tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.