JP2841584B2 - Washing machine permeability detector - Google Patents

Washing machine permeability detector

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Publication number
JP2841584B2
JP2841584B2 JP1309612A JP30961289A JP2841584B2 JP 2841584 B2 JP2841584 B2 JP 2841584B2 JP 1309612 A JP1309612 A JP 1309612A JP 30961289 A JP30961289 A JP 30961289A JP 2841584 B2 JP2841584 B2 JP 2841584B2
Authority
JP
Japan
Prior art keywords
light
light emitting
light receiving
washing machine
wiring board
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.)
Expired - Fee Related
Application number
JP1309612A
Other languages
Japanese (ja)
Other versions
JPH03168188A (en
Inventor
久之 今橋
光幸 木内
Original Assignee
松下電器産業株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 松下電器産業株式会社 filed Critical 松下電器産業株式会社
Priority to JP1309612A priority Critical patent/JP2841584B2/en
Publication of JPH03168188A publication Critical patent/JPH03168188A/en
Application granted granted Critical
Publication of JP2841584B2 publication Critical patent/JP2841584B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permeability detection device for a washing machine that detects the degree of contamination or rinsing by detecting the permeability of a washing liquid.

2. Description of the Related Art Conventionally, a method of optically detecting the turbidity of a washing liquid using an optical sensor including a light emitting element and a light receiving element has been considered, which is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-189092.
That is, the light emitting element and the light receiving element are arranged on the same optical axis,
The light was emitted from the light emitting element into the washing liquid and detected by the light receiving element.

However, the mounting position of the optical sensor composed of the light emitting element and the light receiving element is, in order to reduce the influence of the foam, a drain pipe connected from the bottom of the washing tub or the washing tub with less foaming to the drain valve. The control device for controlling and detecting the optical sensor, which is attached to the upper part of the washing machine, has a problem that the lead wire for electrically connecting them is about 2 to 3 m. Therefore, electric induction noise is likely to be generated in a lead wire between the optical sensor and the control device, and there has been a problem that a light emitting element or a light receiving element is deteriorated in withstand voltage.

The present invention has been made in view of the above problems, and has as its object to provide an inexpensive transmissivity detecting device that prevents a light emitting element or a light receiving element from deteriorating, and has a simple mounting structure.

Means for Solving the Problems In order to achieve the above object, the present invention connects a protection diode in an anti-parallel relationship with a light emitting element or a light receiving element, and mounts the protection diode on the same printed wiring board and connects the connection lead wires. Is what you do. A light emitting element or a light receiving element, a protection diode, and a connection lead wire are soldered to a single-sided printed wiring board, and coated or embedded with a moisture-proof resin.

According to the present invention, the light emitting element or the light receiving element and the protection diode are connected and mounted on the same printed wiring board, thereby not only preventing the withstand voltage deterioration due to the induction noise from the lead wire but also simultaneously performing the moisture proof treatment. is there.

Further, since the light emitting element or the light receiving element is mounted by soldering to the printed wiring board, the printed wiring board can also serve as a part of the mounting structure.

FIG. 1 is an embodiment of a circuit diagram of a transmittance detecting device according to the present invention. 1 is a transmittance detecting device, 2a is a light emitting element, 2b
Is a light receiving element. Reference numeral 3a denotes a reverse breakdown voltage protection diode connected in antiparallel relationship with the light emitting element 2a, and 3b denotes a reverse breakdown voltage protection diode connected in antiparallel relationship to the light receiving element 2b.
When the light receiving element 2b is phototransistor, 3b in the Zener diode, can also serve as a pressure-resistant protective effect of further V CEO if the Zener diode. The transmittance detecting device 1 is connected to the control circuit 4, and 5a and 5b are connection lead wires. Since the light emitting element 2a is an infrared LED and has a low reverse breakdown voltage and is easily deteriorated by a surge voltage, the protection effect of the antiparallel diode is very large. The control circuit 4 controls the light emission output of the transmissivity detecting device and detects a signal from the light receiving element. A / D conversion function for short). The PWM signal is converted into an analog voltage by a D / A conversion circuit (integrating circuit), the base voltage of the light emission output control transistor 8 is controlled, and the light emitting element 2a
To control the light emission output. Reference numeral 9 denotes an emitter resistor having a constant current action. The output terminal of the light receiving element 2b is applied to the A / D conversion input terminal of the microcomputer 6. Resistance 1
0a and 10b are load resistances of the light receiving element 2b, and detect an output current of the light receiving element 2b. The transistor 11 performs sensitivity adjustment by switching the resistance value of the load resistor 10b. Reference numeral 12 denotes a protection diode for the microcomputer 6.

FIG. 2 shows an embodiment of the transmittance detecting apparatus according to the present invention. Printed circuit board 1 with light emitting element 2a and protection diode 3a
Solder to 3a and attach to light transmissive case 14a with screws 15a. 16a is a moisture-proof resin. The lead wire 5a, the diode 3a, and the light emitting element 2a are mounted on the same solder surface. The light emitting portion of the light emitting element 2a is inserted into a guide inside the case. Reference numeral 17 denotes a drain pipe mounting case for mounting the cases 14a and 14b with the optical axis aligned. 18 is a drain pipe. Since the mounting structure on the light receiving side is almost the same, the description is omitted.

FIG. 3 shows another embodiment of the transmittance detecting apparatus according to the present invention. The light emitting element 2a, the light receiving element 2b, and the protection diodes 3a and 3b are mounted and connected on one printed wiring board 13. Second
The protection diode shown in the figure is a surface mount type, but the embodiment of FIG. 3 is an axial type embodiment. The case 14 is a light transmissive resin. Only on the optical axis of light receiving and emitting may be made of a light transmitting resin.

Effect of the Invention As described above, the present invention relates to a lead wire induction nozzle for connecting a control diode and a transmittance detection device by connecting a protection diode in anti-parallel to each of the light emitting and receiving elements for detecting the turbidity of the washing liquid. This prevents the light receiving / emitting element from deteriorating with pressure.

The light-emitting element and the protection diode are mounted on the same printed wiring board, and the connection lead wires are also soldered to the printed wiring board, so that not only the surge voltage protection effect but also the electrical connection is easy, and the moisture-proof resin is used. The moisture proofing method is also simplified. In addition, the method of soldering is simple with a single-sided printed wiring board, and an inexpensive and highly reliable transmittance detector can be realized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a transmittance detecting device according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of a transmittance detecting device according to one embodiment of the present invention, and FIG. 3 is a diagram of another embodiment of the present invention. It is sectional drawing of a transmittance | permeability detection apparatus. 1 ... Transmissivity detector, 2a ... Light emitting element, 2b ... Light receiving element, 3a, 3b ... Protective diode, 5a, 5b ... Connection lead wire, 13a, 13b, 16 ... Printed wiring board.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-22694 (JP, A) JP-A-58-97396 (JP, A) JP-A-2-164398 (JP, A) JP-A 62-69498 189092 (JP, A) Japanese Utility Model sho 59-165177 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) D06F 33/02 G01V 9/04

Claims (1)

(57) [Claims]
1. A light-emitting element and a light-receiving element disposed opposite to each other to detect dirt on a washing liquid. The light-emitting element or the light-receiving element and a protection diode are mounted on the same printed wiring board and are antiparallel to each other. Washing machine permeability detection device connected to the relationship.
JP1309612A 1989-11-29 1989-11-29 Washing machine permeability detector Expired - Fee Related JP2841584B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1309612A JP2841584B2 (en) 1989-11-29 1989-11-29 Washing machine permeability detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1309612A JP2841584B2 (en) 1989-11-29 1989-11-29 Washing machine permeability detector

Publications (2)

Publication Number Publication Date
JPH03168188A JPH03168188A (en) 1991-07-19
JP2841584B2 true JP2841584B2 (en) 1998-12-24

Family

ID=17995126

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1309612A Expired - Fee Related JP2841584B2 (en) 1989-11-29 1989-11-29 Washing machine permeability detector

Country Status (1)

Country Link
JP (1) JP2841584B2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5586567A (en) * 1995-01-10 1996-12-24 General Electric Company Dishwasher with turbidity sensing mechanism
AU2003236669A1 (en) * 2003-05-16 2004-12-03 Elektromanufaktur Zangenstein Hanauer Gmbh And Co. Kgaa Device for a sensor unit for detecting optical properties of a medium
JP5177100B2 (en) * 2009-09-10 2013-04-03 パナソニック株式会社 Equipment transparency detector
JP2014030465A (en) * 2012-08-01 2014-02-20 Panasonic Corp Permeability detection device for washing machine

Also Published As

Publication number Publication date
JPH03168188A (en) 1991-07-19

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