Light-emitting device and image forming apparatus
US12085869B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 2023 |
| Grant date | Sep 10, 2024 |
| Priority date | — |
| Expiry date | May 17, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0412
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes a light-emitting chip, a substrate on which a plurality of light emitting chips are mounted, a controller, and a switch. The light-emitting chip includes a light-emitting portion, which emits light exposing a photosensitive drum surface based on supply of a driving current to the light-emitting portion, and a driving portion that drives the light-emitting portion. The controller controls the driving portion by transmitting a signal to the light-emitting chip and outputs a digital signal corresponding to a target amount of light of the light-emitting portion to the light-emitting chip. Based on a control signal from the controller, the switch switches a connection state between the voltage source and the D/A converter to a first state where the voltage source supplies the reference voltage to the D/A converter, and a second state where an electrical connection between the voltage source and the D/A converter is disconnected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.