Instant camera and manufacturing method of the same

US5491526A · kind A · utility

Assignee

• FUJITSU LIMITED · JP

Inventor

• Mitsuru Shimizu · Toride, JP

Key dates

• Filing date: Jun 22, 1994
• Grant date: Feb 13, 1996
• Expiry date: Jun 22, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G03B17/52
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

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 EQU 0.5.delta..ltoreq.D.sub.1 -D.sub.2 .ltoreq.4 .delta. PA1 where D.sub.1 is a diameter of a center of the first spreading roller, D.sub.2 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 EQU .delta.=WL.sup.3 /(3.pi./D.sub.2.sup.4 .multidot.E) PA1 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 EQU E.gtoreq.WL.sup.3 /(3.pi.D.sub.2.sup.4 .multidot.t) PA1 where t is thickness of the film unit. The spreading roller is prevented from easy deformation.