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Indexed optical encoder, method for indexing an optical encoder, and method for dynamically adjusting gain and offset in an optical encoder

An optical encoder and encoder disk technology, which is applied in the direction of using optical devices to transmit sensing components, instruments, complex mathematical operations, etc., can solve the problems of limited accuracy, reliability calibration, convenience and high cost of mass production, etc.

Inactive Publication Date: 2013-10-16
FARO TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Many conventional devices have issues that limit their accuracy, reliability, calibration and ease of mass production, and they are generally expensive when such fine resolution is required

Method used

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  • Indexed optical encoder, method for indexing an optical encoder, and method for dynamically adjusting gain and offset in an optical encoder
  • Indexed optical encoder, method for indexing an optical encoder, and method for dynamically adjusting gain and offset in an optical encoder
  • Indexed optical encoder, method for indexing an optical encoder, and method for dynamically adjusting gain and offset in an optical encoder

Examples

Experimental program
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example 1

[0178] Example 1: Using Figure 13A .

[0179] For the reverse direction, Q1=LH Table 1 (example offset table)

[0180] Q 3 = HL [from Q 0 closest HL]

[0181] Q 0 =LL

[0182] Q 1 =LH (index start) is always in the "remainder = 1" state.

[0183] Q 2 =HH

[0184] Q 3 =HL

[0185] Q 0 = LL [distance Q 3 closest LL]

[0186] K=10 or 11 depending on whether it ends with a red interval or a blue interval. We will check each case.

[0187] If K=10 then k est =10 / 2=5.5 mod 4=1

[0188] Therefore Q 5 =LH=Q 1 .

[0189] If K=11 then k est =(11+1) / 2=6.6 mod 4=2

[0190] Therefore Q 6 =HH=Q 2 or in the forward direction from Q 1 Start the next state.

[0191] Dir selects the table (actual sequence). We always move forward or backward in the selected form in the same way, regardless of whether the movement is forward or reverse.

[0192] Note: Since we do not have a benchmark P_Count, it cannot be used directly to derive Gray codes.

[0193] Clarificatio...

example 2

[0213] Example 2: Using Figure 13A .

[0214] In the offset table (table 1) Q target =LH=Q1

[0215] Form 1 (repeated)

[0216] Q 0 =LL

[0217] Q 1 = LH (index start) is always in "

[0218] number = 1" state.

[0219] Q 2 =HH-----------------^

[0220] Q 3 =HL

[0221] where K=11,k est = 6 and Q kest =HH=Q2

[0222] Use Equation 5.

[0223] Offset=k target -k est = -1 (move offset table up from estimate to target)

[0224] Therefore, k target =6-1=5

[0225] The structures and methods described above have a number of significant advantages. For example, optical alignment becomes very simple. No precise grating on the encoder scale or positioning of the read head is required. In addition, the gap width (ie, the width of the index mark) is large compared with conventional devices. Therefore, the tolerance of the gap position can be greater than that of conventional encoders. Thus, overall, the structure and method described above result in an encoder t...

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Abstract

An optical encoder may include an encoder disk, an illumination system, and a detector to detect light diffracted from the encoder disk. The encoder disk may include a signal track comprising a diffraction grating, and an index track comprising a reflective index mark, wherein a width of the index mark is larger than a pitch of the diffraction grating. An indexing method may include providing an encoder disk, providing an illumination system to direct light to the encoder disk, providing a detector structured to detect light diffracted from the encoder disk, calculating an estimated count of quadrature states from a rising edge of an index pulse to a middle of the index interval, and calculating the quadrature state at an approximate center of the index pulse. A dynamic parameter correction method may include calculating a target gain and offset and correcting values based on the target gain and offset.

Description

[0001] This application claims priority to U.S. Provisional Application No. 61 / 092,478, filed August 28, 2008, and U.S. Provisional Application No. 61 / 224,657, filed July 10, 2009, both of which are incorporated by reference in their entirety way incorporated into this article. Background technique [0002] A number of devices for measuring angular displacement have been disclosed. Typical devices generally utilize displacement detection in a fringe pattern of diffracted light. [0003] US Patent No. 5,355,220 to Kobayashi et al. discloses a light irradiated from a light source onto a diffraction grating to produce diffracted light of different orders of diffraction allowing detection of bright and dark fringes. Movement is measured by direct detection of fringe movement. [0004] US Patent No. 5,486,923 to Mitchell et al. discloses a grating that minimizes the zeroth order while focusing light of a preselected wavelength into the + and - first orders. The light of the diff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/38G01D5/347G01D5/36
CPCG01D5/34707G01D5/24476G01D5/34G06F17/18G01D5/2457G01D18/00G01D5/3473G01D5/36G01D5/38G01D5/26
Inventor 弗雷德里克·约克
Owner FARO TECH INC
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