Patent ID: 7826787

Claim:
A protective-agent applying device comprising: an applying unit that applies a protective agent containing paraffin to a surface of a photosensitive element in such a manner that when applying the protective agent for 10 minutes, the protective agent equal to or more than 0.5 μg/cm 2 adheres to the surface, and when applying the protective agent for 60 minutes, the protective agent equal to or less than 8 μg/cm 2 adheres to the surface, wherein the protective agent contains 40 percent or more by weight of paraffin, a melting point of the paraffin being in a range of 70° C. to 130° C., the applying unit is a brush having brush fibers planted on a core metal, the brush fibers having a diameter of 10 to 500 μm, a length of 1 to 15 mm, and a density of 10,000 to 300,000 lines per square inch, and the brush is configured to apply the protective agent to the surface of the photosensitive element in such a manner that when applying the protective agent for time t, a coverage of the protective agent with respect to the photosensitive element is equal to or more than a predetermined value, the predetermined value being 40% when the time is 3 minutes and the predetermined value being 60% when the time is 10 minutes, the coverage being (A 0 −A t )/A 0 ×100(%) where A 0 is a ratio of a sum of areas of first peaks having peak tops in a range of 290.3 electron volts to 294 electron volts to an area of an entire C1s spectrum, and A t is a ratio of a sum of areas of second peaks having peak tops in the range of 290.3 electron volts to 294 electron volts to an area of the entire C1s spectrum after the protective agent is applied, the first peaks being obtained by separating wavelengths caused by different bonding states of carbon according to binding energy in the C1s spectrum obtained by X-ray photoelectron spectroscopy analysis of the surface of the photosensitive element in initial state, and the second peaks being obtained by separating wavelengths caused by different bonding states of carbon according to binding energy in the C1s spectrum obtained by X-ray photoelectron spectroscopy analysis of the surface of the photosensitive element after the protective agent is applied for the time t.