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公开(公告)号：JP2001208567A
公开(公告)日：2001-08-03
申请号：JP2000393186
申请日：2000-12-25
Applicant: OSRAM OPTO SEMICONDUCTORS GMBH
Inventor： STEEGMUELLER ULRICH , GROISS STEFAN , FRANK MELLMER
Abstract: PROBLEM TO BE SOLVED: To provide an optical encoder which can be manufactured at reduced costs, in which the area of a semiconductor chip is consumed little on the side of a detector, which maintains the advantage of a known device, which maintains nonsensitivity with reference to a change in light intensity and which detects a linear motion or a rotational motion quantitatively. SOLUTION: The detector is provided with three optical receivers. Optical receiving regions in the three optical receivers are adjacent to each other so as to be arranged in parallel with reference to the direction of the raster device. The length of the detector has the length of a region up to one complete cycle from the half cycle of the raster device in the direction.
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公开(公告)号：DE19963809C2
公开(公告)日：2002-01-17
申请号：DE19963809
申请日：1999-12-30
Applicant: OSRAM OPTO SEMICONDUCTORS GMBH
Inventor： STEEGMUELLER ULRICH , GROISS STEFAN , MOELLMER FRANK
Abstract: The present invention relates to an optical encoder for measuring the speed and direction of a moving raster. The raster may be moving linearly or angularly and may further be connected to a moving element, such as a spinning shaft, of which speed and orientation measurement Is sought. The raster may comprise a slit plate or the like and include many formations in sequence. The formations may be successively opaque and transparent to light. The raster modulates light from a light source and the modulated light is detected by at least one set of three photodetectors. Output of the photodetectors is then used to generate a reference signal to which individual outputs are compared. The results of the comparisons are indicative of the speed and direction of the raster and moving element to which the raster is attached. The at least one set of three photodetectors are oriented such that the combined lengths of the light receiving areas of the set of three photodetectors is between one half and one period of the raster. The photodetectors and evaluating circuitry used to process their output may be semiconductor components on a single substrate.
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公开(公告)号：DE19963809A1
公开(公告)日：2001-07-19
申请号：DE19963809
申请日：1999-12-30
Applicant: OSRAM OPTO SEMICONDUCTORS GMBH
Inventor： STEEGMUELLER ULRICH , GROISS STEFAN , MOELLMER FRANK
Abstract: The encoder has a grid unit (1) with a periodic arrangement of transparent (11) and opaque (12) areas of equal lengths. A light emission unit shines a light beam (10) at the grid unit. A detection unit (2) detects the light beam after it has passed through the grid unit and has been modulated by its movement. An evaluation unit coupled to the detection unit determines the speed and direction (A) of the movement. The detection unit has three photodiodes (21-23,PD A - PD C) with adjacent light detection surfaces parallel to the grid unit. The length of the detection unit in this direction is between a half and a whole period of the grid unit.
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