Linear-tracking pick-up arm drive assembly for audio or video disc player
AssigneePioneer Electronic Corporation
InventorJuniti Ohnishi
Life of this patent
Estimating the term…
Abstract
A linear-tracking pick-up arm drive assembly for an audio or video disc player, comprising a linear motor including a magnet-carrying movable unit movable on and along a pair of spaced, parallel horizontal guide bars, and a pair of horizontally elongated, stationary armatures positioned below the guide bars, characterized in that the magnet-carrying movable unit has a pick-up arm supported above the movable unit and a permanent magnet projecting downwardly into the opening between the two stationary armatures and further in that the movable unit is supported in weight transmitting relationship on the guide bars by a three-point support mechanism which may include three rollers one of which is rollable on one of the guide bars and the others of which are rollable on the other guide bar.
Claims13
A linear-tracking pick-up arm drive assembly for a disc player, comprising horizontally elongated, stationary first and second guide bars spaced apart substantially in parallel from each other;
- a movable unit supported in weight transmitting relationship on said guide bars and movable along the guide bars, said movable unit carrying thereon a linear-tracking pick-up arm having a leading end and rotatable with respect to said movable unit about a substantially horizontal axis substantially perpendicular to the direction of elongation of said pick-up arm;
- electromagnetic drive means for driving said movable unit along said guide bars;
- and pick-up arm lifting means engageable with said pick-up arm for turning said pick-up arm upwardly about said horizontal axis with respect to said movable unit, said lifting means including a lifting member supported by said movable unit and vertically movable with respect to said movable unit and said pick-up arm, and drive means for vertically driving said lifting member, said pick-up arm having a first projection and a second projection, said projection and said second projection being spaced from one another in the direction of elongation of said pick-up arm and projecting downward toward said lifting member, said first projection being remoter from said leading end of the pick-up arm than said second projection, said lifting member being formed with an open-ended groove positioned below said first projection and adapted to capture said first projection when said lifting member is brought into engagement with said pick-up arm.
A linear tracking pick-up arm drive assembly for a disc player, comprising horizontally elongated, stationary first and second guide bars spaced apart substantially in parallel from each other;
- a movable unit supported in weight transmitting relationship on said guide bars and movable along the guide bars, said movable unit carrying thereon a linear-tracking pick-up arm having a leading end and rotatable with respect to said movable unit about a substantially horizontal axis substantially perpendicular to the direction of elongation of said pick-up arm;
- electro-magnetic drive means for driving said movable unit along said guide bars;
- and pick-up arm lifting means engageable with said pick-up arm for turning the pick-up arm upwardly about said horizontal axis with respect to said movable unit, one of said guide bars being rotatable about a predetermined axis substantially parallel to said horizontal axis, said lifting means including drive means operative for turning said rotatable guide bar in two opposite directions through a predetermined angle about said predetermined axis, an abutment member secured to said rotatable guide bar and rotatable therewith about said predetermined axis, and a lifting member supported by said movable unit and veritcally movable with respect to said movable unit and said pick-up arm, said abutment member being engageable with said lifting member when said rotatable guide bar is caused to rotate in a predetermined direction about said predetermined axis, said lifting member being engageable with said pick-up arm and being brought into upwardly pressing engagement with said pick-up arm when engaged by said abutment member.
Dependencies are inferred from the claim text.