Nisshinbo started production of the NJL5821R and the NJL5822R Encoder with Optical Reflection Type，Contribute to Miniaturization of Set and Reduction of Mounting Area

PublishTime： 2022-07-27 Article Source：Nisshinbo

Nisshinbo Micro Devices Inc. has started production of the NJL5821R and the NJL5822R, two-phase digital output encoders with optical reflection types, which are suitable for detecting rotation direction and position.

Overview

In recent years, there has been an increase in demand for rotation detection for small motors and operation dials, as well as for compact position detection to meet higher precision requirements for linear actuators and other equipment.

The NJL5821R and the NJL5822R, two-phase digital output encoders with optical reflection type, achieve low operating current thanks to a newly designed photodetector IC and a high output infrared LED. In conventional position detection such as linear or rotation direction, it is necessary to adjust the distance between the sensor and the striped mirror to be constant. The NJL5821R and the NJL5822R achieve high resistance to the distance variation thanks to the unique processing of the photo detect the level of the photodetector.

From the left, are the Encoder with Optical Reflection Type NJL5821R and NJL5822R. (COB Package)

Features

1. Resistant to Distance Variation to Striped Mirror

In conventional position detection such as linear or rotation direction, it is necessary to adjust the distance between the sensor and the striped mirror to be constant. The NJL5821R and the NJL5822R achieve excellent robustness*1, simplified integration into equipment, and resistance to distance variation by processing the reflected light from the recommended reflector (striped mirror) in a unique manner. In addition, there is almost no variation in duty cycle and phase difference even when the distance between the sensor and the striped mirror is varied.

^{*1 Characteristic not affected by sensor installation accuracy or external environment variation}

2. Integration into Motors Directly Thanks to a Wide Operating Temperature Range (Industry's Highest Temperature)

The NJL5821R and the NJL5822R have succeeded in raising the operating temperature to 105℃ on the high-temperature side. This allows direct integration into products such as motors that are required to operate in high-temperature environments.

3. Low Operating Current Design Including Drive Current of Light Emitting Device (LED)

The NJL5821R and the NJL5822R realize a low operating current design that can be used in battery-powered equipment thanks to the combination of a high-output infrared LED and a highly sensitive photodetector IC with the low operating current. It can be operated with 1/5 of the drive current of conventional products from other companies.*2

^{*2 Based on Nisshinbo Micro Devices Inc. research, as of July 2022.}

4. Available for Detection of Rotation (Movement) Direction and Position by Two-Phase Digital Output

The NJL5821R and the NJL5822R can obtain two-phase digital output easily using recommended reflectors and can detect the direction of rotation (movement) and position.

5. Available for Industrial Applications Thanks to the High Resolution of 150 LPI and 180 LPI

The NJL5821R and the NJL5822R achieve higher resolution than the conventional product of NJL5820R and are available for use in wide applications such as industrial equipment and cameras.

Resolution / Recommended Operating Conditions Comparison Table

Recommended Reflector (Striped Mirror)

^{* In the case of using the striped mirror made by Meltec Corporation.}

Pin Descriptions

^{* Common to the NJL5821R and the NJL5822R}

Product Overview

Example of Detection Method

Applications

· Rotation detection of operation dials

· Rotation detection of zoom motors for imaging equipment

· Incremental encoder

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