Abstract: The present invention relates to an apparatus for connecting a transmission device to an optical pick-up. The transmission device includes a connecting unit and a lead screw and a driving unit. The connecting unit includes a main portion, an elastic portion, a tooth-like portion and a restriction portion. The restriction portion limits the elastic portion to move within a range of a first value. The lead screw engages with the tooth-like portion. A maximum engagement depth between the lead screw and the tooth-like portion is a second value. The second value is larger than the first value to prevent the lead screw and the tooth-like portion from disengaging.

Abstract: When the position of the pickup 14 is normalized, a lead screw 29 is rotated by a stepping motor to move the pickup 14 to the outermost circumferential position, whereby a preset counter is preset to the maximum value CTout corresponding to the outermost circumferential position. The counter counts proportionally to the number of driving pulses to be supplied to the stepping motor, the lead screw 29 rotates till the counting value of the counter gets “0”, so that the pickup 14 moves near the outermost circumferential track of the optical disk in the lead-in area to make the set up. The shape of the tooth flank of the lead screw 29 and the inclination of the engaging projections 27, 28 are designed such that the step out is caused between the engaging projections 27, 28 and the lead screw 29, when the pickup 14 is moved to the outermost circumferential position. Even if this step out is caused, the engaging projections 27, 28 only engage strongly with the lead screw 29.

Abstract: A head positioner arrangement for a tape drive includes a head positioner with a guidance system and a prime mover system, and a floating nut that is positioned between the prime mover system and the guidance system. The floating nut has a three-point contact to the prime mover system. The three-point contact absorbs errors from the prime mover system and prevents these errors from interfering with the guidance system.