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Start Production of NJL5821R and NJL5822R, Encoder with Optical Reflection Type
NISD has started production of the NJL5821R and the NJL5822R, two-phase digital output encoders with optical reflection type, 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 level of the photodetector.
From left, the NJL5821R and the 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 Characteristics 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°C at 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 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 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 with recommended reflectors and can detect the direction of rotation (movement) and position.
5. Available for Industrial Applications Thanks to 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
| Product Name | Resolution | Recommended Operating Conditions | Production Status | ||
| Forward Current | Supply Voltage | Distance to reflector | |||
| NJL5820R | 50.8 LPI | 2 to 30 mA | 2.7 to 5.5 V | 0.2 to 5.0 mm | Under Production |
| NJL5821R | 150 LPI | 2 to 30 mA | 2.7 to 5.5 V | 0.2 to 5.0 mm | Under Production |
| NJL5822R | 180 LPI | 2 to 30 mA | 2.7 to 5.5 V | 0.2 to 5.0 mm | Under Production |
Recommended Reflector (Striped Mirror)
| Product Name | Recommended Reflector (Striped Mirror) | ||
| Direct Reflection/Non-reflection | Size | Reflectance | |
| NJL5820R (Current product) |
Direct Reflection | 0.250 mm | >70% |
| Non-Reflection | 0.250 mm | <20% | |
| NJL5821R | Direct Reflection | 0.085 mm | >70% |
| Non-Reflection | 0.085 mm | <20% | |
| NJL5822R | Direct Reflection | 0.070 mm | >70% |
| Non-Reflection | 0.070 mm | <20% | |
Pin Descriptions
| PIN NO. | SYMBOL | DESCRIPTION |
| 1 | Cathode (LED) | Cathode for LED |
| 2 | GND | GND |
| 3 | Vout2 | Output2 |
| 4 | Vout1 | Output1 |
| 5 | V+ | Power Supply |
| 6 | Anode (LED) | Anode for LED |
Product Overview
| Item | NJL5821R / NJL5822R |
| Package | 2.6 x 2.5 x 0.8 mm COB package |
| Operating Voltage | 2.7 V to 5.5 V |
| Operating Temperature Range | -30°C to 105°C |
| Output Type | Incremental Output Type |
| Output | Two-Phase Digital Output: A, B phase |
| Resolution | NJL5821R: 150 LPI NJL5822R: 180 LPI |
Example of Detection Method
Applications
・Rotation detection of operation dials
・Rotation detection of zoom motors for imaging equipment
・Incremental encoder
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