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    • 3. 发明授权
    • Optical seed sensor for a seed planter monitor
    • 用于种子播种机监视器的光学种子传感器
    • US4163507A
    • 1979-08-07
    • US888398
    • 1978-03-20
    • Dennis M. Bell
    • Dennis M. Bell
    • A01C7/10G06M1/10B65B57/18
    • G06M1/101A01C7/105Y10S111/903
    • An optical seed sensor for a seed planter monitor utilizes light emitting diodes and a rapidly-responding light-receiving solar cell mounted in a seed dispensing chute. A solar cell light shield with a slit narrower than the diameter of a typical seed is mounted adjacent to the solar cell. When a seed passes the light shield, the voltage output of the light-receiving solar cell is temporarily reduced in response to a change in intensity of light at the solar cell. Electronic circuitry converts such solar cell voltage fluctuations into electrical counting pulses for the seed planter monitor. The rapidly-responding solar cell, the partially shielded solar cell and the electronic circuitry cooperate to discriminate between closely spaced or partially overlapping seeds passing through the dispensing chute in order to achieve accurate seed counting.
    • 用于种子播种机监视器的光学种子传感器利用安装在种子分配滑槽中的发光二极管和快速响应的光接收太阳能电池。 具有比典型种子的直径窄的狭缝的太阳能电池灯罩安装在太阳能电池附近。 当种子通过遮光罩时,响应于太阳能电池的光强度的变化,光接收太阳能电池的电压输出暂时降低。 电子电路将这种太阳能电池电压波动转换成种子播种机监视器的计数脉冲。 快速响应的太阳能电池,部分屏蔽的太阳能电池和电子电路协调以区分通过分配槽的紧密间隔或部分重叠的种子,以实现准确的种子计数。
    • 5. 发明授权
    • Magnetic transducer head
    • 磁性换能器头
    • US4193103A
    • 1980-03-11
    • US947447
    • 1978-10-02
    • John C. FeslerDennis M. Bell
    • John C. FeslerDennis M. Bell
    • G11B5/187G11B15/62G11B5/22G11B5/10
    • G11B15/62G11B5/187
    • A magnetic transducer head having, at the face end wall, at least one pair of transducer pole piece portions extending in the direction of movement of the tape and having a gap between them. The pole pieces are tangent, at the gap, to a base plane parallel to the general direction of movement of the tape. In the example illustrated, the pole piece portions are disposed at approximately 13.degree. relative to the base plane so that the spacing between the pole piece portions and the base plane increases with distance from the gap on both the approach to and retreat from the gap. The casing has a tape guide surface which overlies the pole piece portions at the face end wall and determines the angle of approach to and retreat from the pole piece portions. This guide surface is cylindrical in the example illustrated, providing an approximately 7.degree. angle of approach and retreat of the tape relative to the base plane, this being substantially less than the 13.degree. angle of the pole piece portions themselves. When used with a standard NAB tape cartridge, a pressure pad within the cartridge presses the tape against the 7.degree. guide surface to conform therewith, thereby positively training the tape to approach and retreat from the gap at that angle, independent of the larger approach and retreat angles of the pole pieces themselves. The face wall of the head has a central window through which the gap and immediately adjacent surfaces of the pole piece portions extend into direct contact with the tape. The pole piece portions continue beneath the guide surface on the face wall fore and aft of the leading and lagging edges of the window.
    • 一种磁性换能器头,其在所述面端壁处具有至少一对在所述带的移动方向上延伸并且在其之间具有间隙的换能器极片部分。 极片在间隙处与平行于磁带的大体运动方向的基本平面相切。 在所示的示例中,极片部分相对于基底平面设置在大约13度,使得极片部分和基部平面之间的间隔随着与间隙的接近和从间隙的间隙的间隔的距离而增加。 壳体具有带导向表面,该导带表面位于面端壁处的极片部分之间并且确定接近和退出极片部分的角度。 在所示的示例中,该引导表面是圆柱形的,提供了带相对于基面的接近和后退大约7°的角度,这大大小于极片部分本身的13°角。 当与标准NAB带盒一起使用时,盒内的压力垫将带压靠在7°导向表面上以使其符合,从而积极地训练带,以便以该角度从间隙接近和退回,而与更大的方法无关,并且 极片本身的后退角度。 头部的面壁具有中心窗口,极片部分的间隙和紧邻的表面延伸通过该中心窗口与带直接接触。 极片部分在窗口的前缘和后边缘的前壁和后部的面壁上的引导表面下方继续。