Optical rotary encoder
First Claim
1. An optical rotary encoder for detecting a rotational amount or a rotational speed of a rotational shaft, comprising:
- a light emitting section;
a code plate having a body portion for converting light supplied from said light emitting section into a discrete movable beam group and an attachment portion for holding said body portion concentrically with the rotational shaft, said body portion and said attachment portion being formed integrally with each other by integrated plastic molding; and
a light receiving section for receiving light contained in said discrete movable beam group.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical rotary encoder simple in construction and capable of easily securing an aligned state of a code plate with a rotating shaft A disk DS and an attachment portion DM of a code plate (6) are formed of an integrated plastic molded product, so that the assembly work for the code plate (6) itself is unnecessary. A lens group is formed in a predetermined region of the disk DS. When a fitting portion RE of a shaft member (20) is press fitted into an insertion hole DE, alignment holding portions (J1 to J3) are deformed plastically to thereby achieve the alignment. The attachment portion DM and the shaft member (20) are fixed to each other by engaging a fixing bolt BL with threaded holes DH and RH. A plurality of alignment holding portions (K1 to K3) may be provided at the outer peripheral surface of the attachment portion DM. In this case, the alignment is achieved by press fitting the attachment portion DM into a fitted portion RF and plastically deforming the alignment holding portions (K1 to K3). The alignment holding portions may be provided so as to be deformed elastically in the radial direction. Also, a tapered fitting structure may be adopted.
26 Citations
9 Claims
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1. An optical rotary encoder for detecting a rotational amount or a rotational speed of a rotational shaft, comprising:
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a light emitting section;
a code plate having a body portion for converting light supplied from said light emitting section into a discrete movable beam group and an attachment portion for holding said body portion concentrically with the rotational shaft, said body portion and said attachment portion being formed integrally with each other by integrated plastic molding; and
a light receiving section for receiving light contained in said discrete movable beam group. - View Dependent Claims (2)
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3. An optical rotary encoder for detecting a rotational amount or a rotational speed of a rotational shaft, comprising:
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a light emitting section;
a code plate having a body portion for converting light supplied from said light emitting section into a discrete movable beam group and an attachment portion for holding said body portion concentrically with the rotational shaft, said body portion and said attachment portion being formed integrally with each other by integrated plastic molding; and
a light receiving section for receiving light contained in said discrete movable beam group said optical rotary encoder includes alignment holding means for performing the concentric holding of said code plate in alignment with said rotational shaft. - View Dependent Claims (4, 5, 6, 7, 8, 9)
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Specification