Optical encoder system and method
AssigneeMichael Naor
InventorMichael Naor
Life of this patent
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Abstract
An optical encoder is provided. The encoder includes an optical disc mounted on a shaft, the optical disc containing pit and land markings; an optical pickup unit for an optical disc that receives light from the optical disc and supplies as an output an electrical signal representative of the received light, comprising: a reading head objective lens, and dynamic steering actuators that control the focus and tracking of the reading head objective lens; a processor that receives as an input the electrical signal from the optical pickup unit and reports motion of the substrate based on the received at least one electrical signal.
Claims18
An optical encoder coupled to a shaft, rotational motion of which is to be detected and reported out of the optical encoder, comprising:
- an optical disc mounted on the shaft, the optical disc containing pit and land markings;
- an optical pickup unit for an optical disc that receives light from the optical disc and supplies as an output an electrical signal representative of the received light, comprising:
- a reading head objective lens,
- dynamic steering actuators that control the focus and tracking of the reading head objective lens, wherein at least one of the dynamic steering actuators controls the focus and wherein at least another one of the dynamic steering actuators controls the tracking;
- and
- an optical element that splits light originating at a light source into at least a central beam and two flanking beams
- a processor that receives as an input the electrical signal from the optical pickup unit and reports the rotational motion of the optical disc mounted on the shaft based on the received at least one electrical signal out of the optical encoder as the rotational motion of the shaft, and wherein electrical representations of reflection of the flanking beams from the optical disc mounted on the shaft are used to determine the rotational motion reported out of the optical encoder.
An optical encoder coupled to a shaft, rotational motion of which is to be detected and reported out of the optical encoder, comprising:
- an optical disc mounted on the shaft, the optical disc containing pit and land markings;
- an optical pickup unit for an optical disc that receives light from the optical disc and supplies as an output an electrical signal representative of the received light, comprising:
- a reading head objective lens,
- dynamic steering actuators that control the focus and the radial tracking of the reading head objective lens, wherein at least one of the dynamic steering actuators controls the radial tracking;
- and
- an optical element that splits light originating at a light source into at least a central beam and two flanking beams
- a processor that receives as an input the electrical signal from the optical pickup unit and reports the rotational motion of the optical disc mounted on the shaft based on the received at least one electrical signal out of the optical encoder as the rotational motion of the shaft, and wherein electrical representations of reflection of the flanking beams from the optical disc mounted on the shaft are used to determine the rotational motion reported out of the optical encoder.
An optical encoder coupled to a shaft, rotational motion of which is to be detected and reported out of the optical encoder, comprising:
- an optical disc mounted on the shaft, the optical disc containing pit and land markings;
- an optical pickup unit for an optical disc that receives light from the optical disc and supplies as an output an electrical signal representative of the received light, comprising:
- a reading head objective lens,
- dynamic steering actuators that control the focus and tracking of the reading head objective lens, at least one of the dynamic steering actuators being adapted to at least move the reading head objective lens radially with respect to the optical disc mounted on the shaft;
- and
- an optical element that splits light originating at a light source into at least a central beam and two flanking beams
- a processor that receives as an input the electrical signal from the optical pickup unit and reports the rotational motion of the optical disc mounted on the shaft based on the received at least one electrical signal out of the optical encoder as the rotational motion of the shaft, and wherein electrical representations of reflection of the flanking beams from the optical disc mounted on the shaft are used to determine the rotational motion reported out of the optical encoder.
Dependencies are inferred from the claim text.