Vane encoder assembly for adjusting an optical encoder in a data

Details Vane encoder assembly for adjusting an optical encoder in a data Vane encoder assembly for adjusting an optical encoder in a data

1986-05-12

1987-09-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

360109, G01D 534, G11B 556, G11B 2124

Patent

active

046970770

ABSTRACT:
Accurate gap adjustments in an optical encoder used in a magnetic disk drive are achieved within a vane encoder assembly which incorporates a four-bar linkage. The optical encoder includes a fixed reticle and movable vane disposed between a light source and light detector. The fixed reticle is coupled indirectly to a housing which has a prismatic cavity defined therethrough. The prismatic cavity is characterized by a prismatic axis which is generally perpendicular to the direction of gap adjustment between the reticle and movable vane of the optical encoder. The prismatic cavity further defines four generally parallel hinge lines within the housing in a direction parallel to the prismatic axis of the cavity. A single adjustment screw is coupled to the housing to apply a compressive force to the housing in the direction of the gap adjustment. The exertion of varying amounts of compressive force causes the four-bar linkage defined by the cavity to flex, thereby causing the upper and lower surfaces of the housing to move toward or away from each other in a plano-parallel fashion. As the upper and lower surfaces of the housing move in a plano-parallel fashion, the fixed reticle which is coupled to one of these housing surfaces similarly moves in a plano-parallel fashion with the housing and with respect to the movable vane. Thus, fine gap adjustments between the vane and reticle are achieved without altering their initial angular orientation so that they remain in their initial mutually parallel configuration.

REFERENCES:
patent: 4133015 (1979-01-01), Butsch
patent: 4185309 (1980-01-01), Feldstein et al.
patent: 4365279 (1982-12-01), Kinjo
patent: 4550352 (1985-10-01), Nakao
patent: 4625109 (1986-11-01), Nixon

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