1. A fixing device, comprising:
a fixing rotary body;
an opposed member opposing the fixing rotary body to form a nipping portion between the opposed member and the fixing rotary body; and
a heater to heat the fixing rotary body, the heater including plural heat generators arranged in a width direction of a recording medium and separately supplied with power;
wherein, when an unfixed image on the recording medium fed to the nipping portion has an image area and a non-image area, power supplied to each of the heat generators is controlled so that, of the heat generators, a first heat generator corresponding to the image area becomes a higher temperature and plural second heat generators corresponding to the non-image area becomes a lower temperature,
wherein, when the plural second heat generators are adjacent to each other, power supplied to one of the plural second heat generators closer to the image area is set to be greater than power supplied to another of the plural second heat generators farther from the image area,
wherein the plural second heat generators are three or more heat generators adjacent to each other, power supplied to the three or more heat generators becomes stepwisely smaller as the three or more heat generators are farther from the image area, and
wherein a difference in supplied power is constant between any adjacent two of the three or more heat generators.
2. The fixing device of claim 1, wherein the difference in supplied power is determined in accordance with a size or thickness of the recording medium.
3. The fixing device of claim 1, wherein, when power is simultaneously supplied to the heat generators at different values, a difference between a highest value and a lowest value of the different values is set to a prescribed value.
4. The fixing device of claim 3, wherein the prescribed value is determined in accordance with a size or thickness of the recording medium.
5. The fixing device of claim 1, further comprising a pushing member disposed opposing the heater to push the fixing rotary body toward the heater.
6. An image forming apparatus comprising the fixing device of claim 1.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A vertical optoelectronic structure comprising:
an InGaN layer; and
two mirror layers on opposing sides of and sandwiching the InGaN layer.
2. The structure of claim 1, wherein the InGN layer includes an InGaN seed layer and an active InGaN layer grown on the InGaN seed layer.
3. The structure of claim 2, wherein the active InGaN layer has a thickness of 100 nm to 2000 nm.
4. The structure of claim 2, wherein the InGaN seed layer has a thickness of 5 nm to 500 nm.
5. The structure of claim 1, further comprising a substrate atached to one of the mirror layers.
6. The structure of claim 5, which further comprises a dielectric layer between the first substrate and the InGaN seed layer.
7. The structure of claim 1, wherein the mirror layers are distributed Bragg reflectors.
8. The structure of claim 7, wherein the mirror layers comprise all-oxide distributed Bragg reflectors or III-nitride distributed Bragg reflectors.
9. A vertical optoelectronic device comprising the structure of claim 1.