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Multiple-resolution photoelectronic diode sensor array for optical coder

A technology of photodiode and optical encoder, which is applied in the direction of using optical devices to transmit sensing components, convert sensor outputs, optical analog/digital converters, etc.

Inactive Publication Date: 2006-04-19
DR JOHANNES HEIDENHAIN GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another disadvantage of the system disclosed in EP 0 710 819 is the index sensor of this system for determining the absolute position

Method used

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  • Multiple-resolution photoelectronic diode sensor array for optical coder
  • Multiple-resolution photoelectronic diode sensor array for optical coder
  • Multiple-resolution photoelectronic diode sensor array for optical coder

Examples

Experimental program
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Embodiment Construction

[0036] Detailed Description of Preferred Embodiments

[0037] figure 1 A cross-section of an optical encoder according to a preferred embodiment of the present invention is schematically shown. In particular, the optical encoder shown is a rotary encoder 100 that generates positional information about the motion of two rotating objects. For example, rotary encoder 100 may be used in applications with brushless motors.

[0038] Optical encoder 100 includes such as Figure 1-3 , 5, 6, 8, 9 and 11 show a code wheel 102 with a single data track 104 mounted on a shaft that rotates about an axis and moves / rotates in the direction of measurement. For example, the rotating shaft may be the rotor of a brushless DC motor. Furthermore, the optical encoder 100 has a scanning unit 106 for photoelectrically scanning the data track 104 . Such as figure 1 As shown in , the scanning unit 106 includes a light source 110 and a lens 112 which is preferably a condenser or focusing lens. It ...

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PUM

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Abstract

A method of controlling the resolution of an optical encoder for providing position information of an object which moves along a certain measuring direction where the optical encoder includes a light source that emits light and a data track that moves relative to the light source. The method includes directing modulated light from the data track to a plurality of photodiodes of a detection system having a resolution that has a first value; and changing the resolution of the detection system to a second value without altering an arrangement of the plurality of photodiodes of the detection system during the changing from the first value to the second value.

Description

field of invention [0001] The present invention relates to photodiode sensor arrays used for multiple optical resolutions. In particular, the invention relates to photodiode sensor arrays for optical encoders used for multi-resolution. Background of the invention [0002] Optical encoders for determining the relative position of two movable objects are well known. It is possible to determine the relative position in the direction of linear movement as well as in the direction of rotational movement. In these systems, one object is usually connected to the scanning scale and the other object is connected to the scanning unit. A linear scale with a linear scale is used in the case of a linear encoder, and a code wheel with a circular scale is used in the case of a rotary encoder. Scanning units used for linear or rotational movement have one or more illumination sources and one or more photodetector elements. Instead detector elements such as photodiodes are often used. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F7/00G01D18/00G01D5/30H01L27/144G01D5/34G01D5/347G01D5/36
CPCG01D5/36G01D5/34
Inventor R·E·弗兰克林R·M·福尔塞斯
Owner DR JOHANNES HEIDENHAIN GMBH