公开(公告)号：US3790261A

公开(公告)日：1974-02-05

申请号：US3790261D

申请日：1973-05-17

Applicant: THRELKELD R

Inventor： THRELKELD R

IPC: G03B21/32 ,  G03B23/02

CPC classification number: G03B21/325

Abstract: A long play film cartridge and projector wherein an endless loop of film may be nine hundred to 5,000 feet or more in length and which may be used to project a series of pictures continuously; the cartridge having a novel dish shaped film holding rotor of a material having a particular coeficient of surface friction with radiating film supporting ridges having upper surfaces declining downwardly from the outer periphery towards a central hub which is surrounded by a flat ring shaped surface portion with which the inner ends of said ridges are substantially flush, whereby a large spiral roll of film is carried on said film holding rotor and is fed therefrom near said hub where the relative center of said spiral roll is automatically maintained in loosely packed convolutions; said projector operated at a lower linear film rate than the linear film rate of said film holding rotor and the film holding rotor is actuated intermittently in response to tension on displacement of said film created by demand of said projector.

Abstract translation: 长片播放胶片和投影仪，其中无限循环的胶片长度可以为九百到五千英尺或更长，并可用于连续投影一系列图像; 该盒具有保持具有特定表面摩擦系数的材料的新型盘形膜，该辐射膜支撑脊具有从外周朝下向下延伸的中心轮毂的中心轮毂，该中心毂被平环形表面部分包围， 所述脊的内端基本齐平，由此在所述胶片保持转子上承载大的螺旋卷胶卷，并在所述轮毂附近供给所述螺旋卷，所述螺旋卷的相对中心自动保持在松散包装的卷积中; 所述投影仪以比所述胶片保持转子的线性胶片速率低的线性胶片速率操作，并且响应于由所述投影仪的需求产生的所述胶片的位移的张力而间断地致动胶片保持转子。