公开(公告)号：US20050094993A1

公开(公告)日：2005-05-05

申请号：US10699725

申请日：2003-11-03

申请人： David Dowe ,  Daniel Scoville ,  Robert Stanchus ,  Donald Coulter

发明人： David Dowe ,  Daniel Scoville ,  Robert Stanchus ,  Donald Coulter

IPC分类号： G03B1/00 ,  G03B1/60

CPC分类号： G03B1/60

摘要： An auto-metering system for use in a film camera having an automatic film advance system is provided. The auto-metering system has a sprocket wheel having a support member arranged so that when the automatic film advance system advances film, the sprocket wheel is rotated, with the sprocket wheel having a gear engagement surface and a reduction gear engaging the gear engagement surface of the sprocket wheel. The reduction gear has a lobe thereon, and is adapted to move the lobe between a first position to a second position with said movement between the first position and second position occurring at a different rate than the rate of rotation of the sprocket wheel. A metering switch is located at the second position. The metering switch changes between a first state when the cam is not at the second position and a second state when the cam is at second position. A control circuit controls operation of the film advance system based upon to the state of the metering switch. Wherein the sprocket wheel, reduction gear and lobe, are arranged so the lobe is at the second position when the film is advanced by a predetermined amount.

摘要翻译： 提供一种用于具有自动胶片提前系统的胶片相机中的自动测光系统。 所述自动计量系统具有链轮，所述链轮具有支撑构件，所述支撑构件布置成使得当所述自动膜前进系统前进膜时，所述链轮旋转，所述链轮具有齿轮啮合表面和与所述齿轮接合表面的齿轮啮合表面接合的减速齿轮 链轮。 减速机在其上具有凸角，并且适于在第一位置与第二位置之间移动凸角，所述第一位置和第二位置之间的运动以与链轮旋转速率不同的速率发生。 计量开关位于第二位置。 当凸轮不在第二位置时，计量开关在第一状态和凸轮处于第二位置时的第二状态之间变化。 控制电路基于计量开关的状态来控制胶片提前系统的操作。 其中链轮，减速齿轮和凸角被布置成当胶片前进预定量时凸角处于第二位置。