1974-12-30
1976-08-10
Phillips, Charles E.
Undertaking
G11B 310
Patent
active
039737772
ABSTRACT:
The present invention provides, in a record player, a cueing control means embodying a hydraulic control member which utilizes the viscosity of a fluid of high internal friction and which provides for a substantially uniform rate of withdrawal of the needle from the groove and a uniform rate of return of the needle to the groove. The rate of movement may be adjusted but preferably remains the same within the cycle of withdrawal of the needle and its return to the groove. This substantially obviates change in tone or pitch which will occur if the rate of withdrawal differs from the rate of needle reentry into the groove. The hydraulic fluid employed in the preferred embodiment of the invention is one or more discrete bodies of silicone grease, or its equivalent. This material is stable under a wide range of conditions of temperature and pressure. It is cohesive and is inert to metals with which it is in contact. It has a high surface tension and a high viscosity and even though exposed to the atmosphere retains the aforesaid characteristics without deterioration over long periods of time. Thereby the rate of withdrawal of the needle from the groove and the rate of restoration of the same to the groove are maintained substantially uniform, and the introduction of a change in tone due to variation in the rate of movements involved in the cueing operation is avoided. The mechanism involves a brake to hold the needle in fixed radial (groove) position from the initiation of the cueing operation to the termination thereof. The timing of the movement of the brake to hold radial position of the needle and lifting pin is critical to the proper performance of the cueing means and the playing of the record. The brake applies a small frictional drag to the tone arm to stop it from moving laterally just prior to the needle starting to come out of the groove. When cueing the arm manually, or in an automatic mode, the needle should always be returned to the same passage of the record where cueing was begun. The brake is timed to be applied just before the tone arm lifts the needle off of the record and remains on during the cueing operation. The applied brake force results in lateral frictional resistance that exceeds the antiskate force of the needle in the groove. The timing control is inherently good in the present disclosure seeing that the lift and brake actions stem from the same rocker plate.
REFERENCES:
patent: 3388912 (1968-06-01), Shimoda et al.
patent: 3534967 (1970-10-01), Freier
patent: 3717350 (1973-02-01), Oakley et al.
patent: 3727922 (1973-04-01), Igata
patent: 3761098 (1973-09-01), Nishiwaki et al.
Avnet, Inc.
Crowley Richard P.
Phillips Charles E.
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