| 摘要 |
An instant camera is used with a film unit, in which a solution pod contains processing solution. The camera has first and second rotatable spreading rollers, which apply pressure to the film unit. When rotated the spreading rollers squeeze the pod, exit the film unit, and spread the solution. At least the first spreading roller is shaped to have convexity at a center like a barrel which meets 0.5 delta </=D1-D2</=4 delta where D1 is a diameter of a center of the first spreading roller, D2 is a diameter of ends of the first spreading roller, and delta is an amount at which the roller center is flexed relative to the roller ends and which meets delta =WL3/(3 pi /D24xE) where E is Young's modulus of material of the first spreading roller, L is a length of the first spreading roller, and W is load applied between the two spreading rollers. At least the first spreading roller is of the material meeting E>/=WL3/(3 pi D24xt) where t is thickness of the film unit. The spreading roller is prevented from easy deformation.
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