Image forming apparatus with first and second print engines

1. An image forming apparatus, comprising:

a first print engine that forms a first image formed of a first toner having a first average particle diameter; and

a second print engine that forms a second image formed of a second toner having a second average particle diameter larger than the first average particle diameter,

wherein the first image and the second image are transferred onto a recording medium in that stated order, and

wherein the first toner is a white toner and the second toner is a color toner other than white.

2. The image forming apparatus according to claim 1 , wherein the first image is a solid image formed on an entire surface of the recording medium.

3. The image forming apparatus according to claim 1 , wherein the first average particle diameter is not larger than 0.95 times the second average particle diameter.

4. The image forming apparatus according to claim 1 , wherein the first average particle diameter is not smaller than 6.0 μm and not larger than 6.5 μm.

5. The image forming apparatus according to claim 1 , wherein the first image has a larger thickness than the second image.

6. The image forming apparatus according to claim 1 , wherein the first average particle diameter is smaller than surface relief heights of the recording medium.

7. The image forming apparatus according to claim 1 , further comprising:

an image bearing body; and

a secondary transfer section;

wherein the second print engine transfers the second image onto the image bearing body, and then the first print engine transfers the first image onto the second image;

wherein the secondary transfer section transfers the first image and the second image formed on the image bearing body onto the recording medium;

wherein the image bearing body has surface relief heights smaller than the first average particle diameter.

8. The image forming apparatus according to claim 7 , wherein the recording medium has larger surface relief heights than the image bearing body.

9. The image forming apparatus according to claim 1 , wherein the first image has a thickness larger than surface relief heights of the recording medium.

10. An image forming apparatus, comprising:

a first print engine that forms a first image formed of a first toner having a first average particle diameter; and

a second print engine that forms a second image formed of a second toner having a second average particle diameter larger than the first average particle diameter,

wherein the first image and the second image are transferred onto a recording medium in that stated order, and

wherein the first toner is a color toner and the second toner is a transparent toner.

11. The image forming apparatus according to claim 10 , wherein the second image is a solid image that covers an entire area of the first image.

12. The image forming apparatus according to claim 10 , further comprising:

an image bearing body; and

a secondary transfer section;

wherein the second print engine transfers the second image onto the image bearing body, and then the first print engine transfers the first image onto the second image;

wherein the secondary transfer section transfers the first image and the second image onto the recording medium;

wherein the image bearing body has surface relief heights larger than the average particle diameter of the second toner.

13. An image forming apparatus, comprising:

a first print engine that forms a first image formed of a first toner having a first average particle diameter; and

a second print engine that forms a second image formed of a second toner having a second average particle diameter larger than the first average particle diameter,

wherein the first image and the second image are transferred onto a recording medium in that stated order, and

wherein the first toner has a profile of distribution of particle diameters that includes a first peak of profile and a second peak of profile, the first peak of profile being at a first particle diameter and the second peak of profile being at a second particle diameter smaller than the first particle diameter.

14. The image forming apparatus according to claim 13 , wherein the second peak of profile is at a particle diameter smaller than surface relief heights of the recording medium.

15. The image forming apparatus according to claim 13 , wherein the first toner is a white toner and the second toner is a color toner other than white.

16. The image forming apparatus according to claim 13 , wherein the first toner is a color toner and the second toner is a transparent toner.

17. The image forming apparatus according to claim 13 , wherein the first average particle diameter is not larger than 0.95 times the second average particle diameter.

18. The image forming apparatus according to claim 13 , wherein the first average particle diameter is not smaller than 6.0 μm and not larger than 6.5 μm.

19. The image forming apparatus according to claim 13 , wherein the first image has a larger thickness than the second image.

20. The image forming apparatus according to claim 13 , wherein the first average particle diameter is smaller than surface relief heights of the recording medium.

21. The image forming apparatus according to claim 13 , further comprising:

an image bearing body; and

a secondary transfer section;

wherein the second print engine transfers the second image onto the image bearing body, and then the first print engine transfers the first image onto the second image;

wherein the secondary transfer section transfers the first image and the second image formed on the image bearing body onto the recording medium;

wherein the image bearing body has surface relief heights smaller than the first average particle diameter.

22. The image forming apparatus according to claim 21 , wherein the recording medium has larger surface relief heights than the image bearing body.

23. The image forming apparatus according to claim 21 , wherein the first image has a thickness larger than surface relief heights of the recording medium.