Patent ID: 11914318
Assignee: OKI ELECTRIC INDUSTRY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. An image forming apparatus, comprising:
a first image forming part that forms a first image on a print medium using a photoluminescent developer containing a photoluminescent pigment;
a second image forming part that forms a second image on the print medium using a coloring developer containing a coloring material; and
a lamination part that laminates the first image and the second image on the print medium, wherein
a viscoelastic phase angle (A) of the coloring developer and a viscoelastic phase angle (B) of the photoluminescent developer when measured at 125[° C.] using a viscoelasticity measuring device satisfy follow:

21.1[°]≤(A−B)≤31.6[°].

where
A means a viscoelastic phase angle of the coloring developer,
B means a viscoelastic phase angle of the photoluminescent developer.