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US 2003/0209658 A1Published application
Optical encoder
AssigneeOMRON Corporation
InventorsHiroshi Iguchi, Ikuo Takeda, Hirokazu Yauchi, Arata Nakamura
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AssigneeOMRON Corporation
InventorsHiroshi Iguchi, Ikuo Takeda, Hirokazu Yauchi, Arata Nakamura
Estimating the term…
An optical encoder including a graduation plate inscribed with a graduation line along a predetermined direction and an optical reader for optically reading the graduation line on the graduation plate in which a corresponding electric signal is outputted from the optical reader in accordance with movement of the graduation plate and the optical reader relative to each other, the optical reader includes a light projecting optical system for irradiating light from a light projecting light source to the graduation plate and a light receiving optical system for focusing light from the graduation plate to a light receiving portion and the light receiving optical system is constituted by a telecentric optical system to thereby enable to be fabricated at low cost by dispensing with high integrating accuracy.
An optical encoder which is an optical encoder including a graduation plate inscribed with a graduation line along a predetermined direction and an optical reader for optically reading the graduation line on the graduation plate, wherein a corresponding electric signal is outputted from the optical reader in accordance with movement of the graduation plate and the optical reader relative to each other;
A reflection type optical reader module comprising a light projecting light source, an object lens for irradiating light from the light projecting light source in the form of a spot as parallel light to a graduation plate to include a group of graduation lines and returning rearward light reflected by the graduation plate to direct to the light projecting light source, an optical separator disposed between the light projecting light source and the object lens for separating the rearward light reflected by the graduation plate from the forward light directed from the light source to the object lens, a pin hole plate arranged at a focal position on a front side of an optical axis of the rearward light separated by the optical separator, and a light receiving portion arranged at a focusing position of light ray after passing through the pin hole plate and having a light receiving array pattern in correspondence with images of the group of graduation lines to integrally be contained in a case having a window used both for projecting and receiving light, wherein said reflection type optical reader module can be integrated to an optical encoder.
A transmission type optical reader module comprising a light projecting optical system including a light projecting light source for irradiating light in the form of a spot to a face on one side of a graduation plate to include a group of light transmitting graduation lines;
A light receiving side optical module comprising a light receiving side lens for gathering light transmitted through a graduation plate inscribed with a light transmitting graduation line, a pin hole plate arranged at a focal position on a front side of an optical axis of the light receiving side lens and a light receiving portion arranged at a focusing position of light ray after passing through the pin hole plate and having a light receiving array pattern in correspondence with images of a group of the graduation lines to be integrally contained in a case having a light receiving window, wherein a transmission type reader can be constituted by integrating said light receiving side optical module to an optical encoder along with a light projecting side optical system.
A graduation plate for an optical encoder which is a graduation plate for an encoder applied to a reflection type optical reader including a coaxially radiating type optical system constituting a lens used both for projecting and receiving light by an object side telecentric lens, wherein the graduation line comprises a mirror face reflecting face and a region between the graduation lines comprises a rough face, or the graduation line comprises a rough face and the region between the graduation lines comprises a mirror face reflecting face.
Dependencies are inferred from the claim text.