US 2026/0036449 A1Published application

Photoelectric detection device and optical encoder

AssigneeQuanzhou KTsense Microelectronics Co.,Ltd.

InventorsChao WANG, Kaixin ZHANG, Weijie SHI

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Abstract

The present invention relates to the field of photoelectric detection technology. It discloses a photoelectric detection device and an optical encoder. The photoelectric detection device includes: a plurality of first-level detection arrays, where each first-level detection array includes at least one photoelectric detection unit, and an electrical signal output by the at least one photoelectric detection unit included in one first-level detection array is used as a first-level electrical signal output by the first-level detection array; the plurality of first-level detection arrays are divided into a plurality of second-level detection arrays, and a coordinate difference between corresponding points of two adjacent first-level detection arrays belonging to a same second-level detection array is x×P/N+(t1×P)/(t2×N), and corresponding first-level electrical signals in the t2 first-level detection arrays which belong to the same second-level detection array are added together, so as to suppress an Nth-order harmonic component and harmonic components whose orders are integer multiples of N. The optical encoder includes the above photoelectric detection device. In the present invention, harmonic components can be effectively suppressed, and the photoelectric detection device is easy to design and manufacture

Claims10

Dependent claims

A photoelectric detection device for an optical encoder, the photoelectric detection device comprising a first pattern, wherein the first pattern is obtained by performing rectangle-to-fan-shape transformation on a second pattern, and the second pattern comprises:

a plurality of first-level detection arrays, wherein each first-level detection array comprises at least one photoelectric detection unit, each photoelectric detection unit outputs one electrical signal, and an electrical signal output by the at least one photoelectric detection unit included in one first-level detection array serves, directly or after combination, as a first-level electrical signal output by the first-level detection array, wherein:
the plurality of first-level detection arrays are divided into a plurality of second-level detection arrays, each of the plurality of second-level detection arrays comprises t2 first-level detection arrays, and among t2 first-level detection arrays belonging to a same second-level detection array, a coordinate difference between corresponding points of two adjacent first-level detection arrays is x×P/N+(t1×P)/(t2×N), wherein t1 is a natural number greater than or equal to 1, t2 is a natural number greater than or equal to 2, t1 and t2 are relatively prime, P is a value predetermined based on a total quantity of slits of a grating used by the optical encoder, N is an odd number greater than or equal to 3, x is a natural number, and x is selected such that the first-level detection arrays do not spatially overlap with each other;
and
each of the plurality of second-level detection arrays outputs at least one second-level electrical signal, and each second-level electrical signal is obtained by adding together a set of t2 corresponding first-level electrical signals, which are t2 corresponding first-level electrical signals respectively output by the t2 first-level detection arrays that belong to a same second-level detection array, so as to suppress an Nth-order harmonic component and harmonic components whose orders are integer multiples of N in the second-level electrical signal.

1 more element

A photoelectric detection device for an optical encoder, the photoelectric detection device comprising a second pattern, and the second pattern comprising:

a plurality of first-level detection arrays, wherein each first-level detection array comprises at least one photoelectric detection unit, each photoelectric detection unit outputs one electrical signal, and an electrical signal output by the at least one photoelectric detection unit included in one first-level detection array serves, directly or after combination, as a first-level electrical signal output by the first-level detection array;
wherein:
the plurality of first-level detection arrays are divided into a plurality of second-level detection arrays, each of the plurality of second-level detection array comprises t2 first-level detection arrays, and among t2 first-level detection arrays belonging to a same second-level detection array, a coordinate difference between corresponding points of two adjacent first-level detection arrays is x×P/N+(t1×P)/(t2×N), wherein t1 is a natural number greater than or equal to 1, t2 is a natural number greater than or equal to 2, t1 and t2 are relatively prime, P is a slit period of a grating used in the optical encoder, N is an odd number greater than or equal to 3, x is a natural number, and x is selected to prevent the first-level detection arrays from spatially overlapping with each other;
and
each of the plurality of second-level detection arrays outputs at least one second-level electrical signal, and each second-level electrical signal is obtained by adding together a set of corresponding first-level electrical signals, which are t2 corresponding first-level electrical signals respectively output by the t2 first-level detection arrays that belong to the same second-level detection array, so as to suppress an Nth-order harmonic component and harmonic components whose orders are integer multiple of N in the second-level electrical signal.

2 more elements

Dependencies are inferred from the claim text.