JPS5556673A - Photocoupler - Google Patents
PhotocouplerInfo
- Publication number
- JPS5556673A JPS5556673A JP12998478A JP12998478A JPS5556673A JP S5556673 A JPS5556673 A JP S5556673A JP 12998478 A JP12998478 A JP 12998478A JP 12998478 A JP12998478 A JP 12998478A JP S5556673 A JPS5556673 A JP S5556673A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- light
- led
- constitution
- degradation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To prevent aging change in characteristics of a photocoupler in a simple constitution wherein a resistor whose resistance varies with the light from a light emitting diode is provided.
CONSTITUTION: A resistor R whose resistance varies with the light from a LED 11 is connected in series with a photodetecting transistor 12. In this constitution, since the resistance of the resistor R increases with degradation of light-emitting efficiency of the LED, decrease in the transistor current due to the degradation of light emitting efficiency of the LED is compensated, and the voltage generated across the resistor R can be maintained at an approximately constant level.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12998478A JPS5556673A (en) | 1978-10-24 | 1978-10-24 | Photocoupler |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12998478A JPS5556673A (en) | 1978-10-24 | 1978-10-24 | Photocoupler |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5556673A true JPS5556673A (en) | 1980-04-25 |
Family
ID=15023273
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12998478A Pending JPS5556673A (en) | 1978-10-24 | 1978-10-24 | Photocoupler |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5556673A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5889047U (en) * | 1981-12-11 | 1983-06-16 | ジヨンソン株式会社 | aromatic container |
-
1978
- 1978-10-24 JP JP12998478A patent/JPS5556673A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5889047U (en) * | 1981-12-11 | 1983-06-16 | ジヨンソン株式会社 | aromatic container |
JPS623156Y2 (en) * | 1981-12-11 | 1987-01-24 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
IT8223522A0 (en) | CONSTANT CURRENT GENERATOR CIRCUIT, WITH LOW SUPPLY VOLTAGE, CAN BE INTEGRATED MONOLITHICALLY. | |
JPS5556673A (en) | Photocoupler | |
JPS5550117A (en) | Led light source device for pulse encoder | |
JPS5355053A (en) | Photoelectric encoder | |
JPS57141729A (en) | Constant voltage generating circuit | |
JPS5398789A (en) | Compensation circuit for semiconductor light emitting element | |
JPS5380186A (en) | Negative resistance luminous element | |
JPS5762774A (en) | Output voltae control circuit | |
JPS5541022A (en) | Photo oscillation circuit | |
JPS5745285A (en) | High withstand voltage diode | |
JPS5687384A (en) | Light emitting diode type display lamp | |
JPS54144892A (en) | Drive circuit for light emitting semiconductor element | |
JPS5636228A (en) | Photo coupling element | |
JPS5453215A (en) | Switching power source | |
JPS5687116A (en) | Switching type power circuit | |
JPS57105624A (en) | Safety device for combustion equipment | |
JPS55143080A (en) | Luminous source device with light emitting element | |
JPS6441320A (en) | Photoelectric switch | |
JPS57182120A (en) | Photocoupler device | |
JPS5333081A (en) | Semiconductor light emitting device | |
JPS57136231A (en) | Constant voltage power supply device | |
JPS5416184A (en) | Semiconductor diode element | |
JPS5397881A (en) | Voltage indicator | |
JPS5451452A (en) | Light emitting element drive circuit | |
JPS53132751A (en) | Constant voltages source circuit with indicator |