Light emitting apparatus, print head and image forming apparatus
AssigneeFuji Xerox Co., Ltd.
InventorSeiji Ohno
Life of this patent
Estimating the term…
Abstract
A light emitting apparatus includes a plurality of light emitting chips, a first wire, a second wire, a third wire, and a fourth wire. The plurality of light emitting chips each have a plurality of light emitting devices and are divided into a plurality of chip groups, the light emitting devices in each of the light emitting chips being divided into a plurality of device groups. The first wire transmits in common a transmission signal to the light emitting chips. The second wire transmits in common a first selection signal to a given chip group of the light emitting chips. The third wire transmits in common a second selection signal to a set of the device groups. The fourth wire transmits a turn-on control signal to each of the chip groups.
Claims5
A light emitting apparatus comprising:
- a plurality of light emitting chips that each have a plurality of light emitting devices and are divided into a plurality of chip groups, the light emitting devices in each of the light emitting chips being divided into a plurality of device groups;
- a first wire that transmits in common a transmission signal to the light emitting chips in order to successively set the light emitting devices in each of the light emitting chips as subjects of turn-on or non-turn-on control;
- a second wire that transmits in common a first selection signal to a given chip group of the light emitting chips in order to select the given chip group as a subject of the turn-on control in a period in which the light emitting devices in each of the light emitting chips are set as the subjects of the turn-on or non-turn-on control based on the transmission signal;
- a third wire that transmits in common a second selection signal to a set of the device groups in order to select the set of the device groups as a subject of the turn-on control in the period in which the light emitting devices in each of the light emitting chips are set as the subjects of the turn-on or non-turn-on control based on the transmission signal, the set of the device groups including a first device group of the light emitting devices in the light emitting chips belonging to one of the chip groups and a second device group of the light emitting devices in the light emitting chips belonging to the others of the chip groups;
- and
- a fourth wire that transmits a turn-on control signal to each of the chip groups in order to control power supply for turning on the light emitting devices in the period in which the light emitting devices in each of the light emitting chips are set as the subjects of the turn-on or non-turn-on control based on the transmission signal.
Dependencies are inferred from the claim text.