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US 10,471,734 B2Granted
Light emitting component, print head and image forming apparatus
AssigneeFuji Xerox Co., Ltd.
InventorTakashi Kondo
Life of this patent
Estimating the term…
Abstract
A light emitting component includes: plural transfer devices that successively come into ON state; plural setting thyristors that are connected to the plural transfer devices, respectively, and come into a state of being able to shift to ON state by the transfer devices coming into ON state; and plural light emitting devices that are connected to the plural setting thyristors in series, respectively, and emit light or increase in light emission amounts when the setting thyristors come into ON state, and the setting thyristors are formed so as to comprise a voltage reducing layer having a bandgap smaller than bandgaps of light emitting layers of the light emitting devices.
Claims20
A light emitting component comprising:
- a plurality of transfer devices that successively come into ON state;
- a plurality of setting thyristors that are connected to the plurality of transfer devices, respectively, and come into a state of being able to shift to ON state by the transfer devices coming into ON state;
- and
- a plurality of light emitting devices that are laminated on the plurality of setting thyristors so as to be connected to the plurality of setting thyristors in series, respectively, and emit light when the setting thyristors come into ON state,
- wherein the setting thyristors comprise a plurality of semiconductor layers including one of an anode layer and a cathode layer, a voltage reducing layer, a first gate layer, a second gate layer, and the other of the anode layer and the cathode layer which are laminated in order from a substrate, and electrodes connecting to the plurality of transfer devices are provided on the second gate layer, and
- wherein the voltage reducing layer has a bandgap smaller than bandgaps of light emitting layers of the light emitting devices.
3 more elements
A printer head comprising:
- a light emitting portion comprising:
- a plurality of transfer devices that successively come into ON state;
- a plurality of setting thyristors that are connected to the plurality of transfer devices, respectively, and come into a state of being able to shift to ON state by the transfer devices coming into ON state;
- and a plurality of light emitting devices that are laminated on the plurality of setting thyristors so as to be connected to the plurality of setting thyristors in series, respectively, and emit light when the setting thyristors come into ON state;
- and
- an optical portion that images light emitted from the light emitting portion,
- wherein the setting thyristors comprise a plurality of semiconductor layers including one of an anode layer and a cathode layer, a voltage reducing layer, a first gate layer, a second gate layer, and the other of the anode layer and the cathode layer which are laminated in order from a substrate, and electrodes connecting to the plurality of transfer devices are provided on the second gate layer, and
- wherein the voltage reducing layer has a bandgap smaller than bandgaps of light emitting layers of the light emitting devices.
5 more elements
An image forming apparatus comprising:
- an image carrier;
- a charging portion that charges the image carrier;
- an exposing portion comprising:
- a plurality of transfer devices that successively come into ON state;
- a plurality of setting thyristors that are connected to the plurality of transfer devices, respectively, and come into a state of being able to shift to ON state by the transfer devices coming into ON state;
- and a plurality of light emitting devices that are laminated on the plurality of setting thyristors so as to be connected to the plurality of setting thyristors in series, respectively, and emit light when the setting thyristors come into ON state, and exposing the image carrier through an optical portion;
- a developing portion that develops an electrostatic latent image formed on the image carrier by being exposed by the exposing portion;
- and
- a transfer portion that transfers an image developed onto the image carrier to a transfer object,
- wherein the setting thyristors comprise a plurality of semiconductor layers including one of an anode layer and a cathode layer, a voltage reducing layer, a first gate layer, a second gate layer, and the other of the anode layer and the cathode layer which are laminated in order from a substrate, and electrodes connecting to the plurality of transfer devices are provided on the second gate layer, and
- wherein the voltage reducing layer has a bandgap smaller than bandgaps of light emitting layers of the light emitting devices.
8 more elements
A light emitting component comprising:
- a thyristor;
- and
- a light emitting device laminated on the thyristor so as to be connected to the thyristor through a tunnel junction,
- wherein the thyristor comprises a plurality of semiconductor layers including one of an anode layer and a cathode layer, a voltage reducing layer, a first gate layer, a second gate layer, and the other of the anode layer and the cathode layer which are laminated in order from a substrate,
- a layer of the plurality of semiconductor layers of the thyristor has a bandgap smaller than a bandgap of a light emitting layer of the light emitting device, and
- the tunnel junction is formed so as to be set to reverse bias when the light emitting device is set to forward bias.
3 more elements
A light emitting component comprising:
- a thyristor;
- and
- a light emitting device laminated on the thyristor so as to be connected to the thyristor through a III-V compound layer having metallic conductivity,
- wherein the thyristor comprises a plurality of semiconductor layers including one of an anode layer and a cathode layer, a voltage reducing layer, a first gate layer, a second gate layer, and the other of the anode layer and the cathode layer which are laminated in order from a substrate, and electrodes connecting to the plurality of transfer devices are provided on the second gate layer, and
- a layer of the plurality of semiconductor layers of the thyristor has a bandgap smaller than a bandgap of a light emitting layer of the light emitting device.
2 more elements
Dependencies are inferred from the claim text.