JPH025463Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a device for preventing malfunction of a panel switch for a vehicle, and more specifically, a panel switch for a vehicle that can prevent malfunctions caused by both the driver's operation and vehicle vibration. This invention relates to a malfunction prevention device.

(Prior Art) With the introduction of car electronics technology, panel switches as man-machine interfaces are often used in vehicles.

FIG. 1 is a diagram showing the basic configuration of a panel switch. Here, we will explain an example of a switch that selects ON, OFF, and AUTO for the air conditioner (AC). The opening of case 1 is covered with cover sheet 2.
Key tops 3 and light guide plates 4 are alternately arranged within the opening. “AC ON”, “AC AUTO”, AC OFF” on key top 3
There are characters written on it. A printed board 5 is attached to the back side of the opening of the case 1.
A contact point 6 is provided. A spring rubber 7 is inserted between the key top 3 and the printed board 5, and a conductive rubber 8 is provided on the spring rubber 7 to face the contact 6.

This type of panel switch requires only a small operating force, and the operating stroke, that is, the distance between the contact point 6 and the conductive rubber 8, is extremely short, usually less than 1 mm.
There were cases where it would start working even if I touched it by mistake. In addition, vibrations from the vehicle could also cause the device to operate in a similar manner.

In order to prevent erroneous operations, a method could be considered in which the input is determined only when the switch is pressed for a certain period of time, but this has the problem of poor responsiveness.

(Purpose of the invention) The purpose of the invention is to prevent malfunctions caused by erroneous operation of panel switches used as input devices for electronic devices using microcomputers, such as drive computers installed in vehicles and automatic air conditioners, and vibrations during driving. An object of the present invention is to provide a malfunction prevention device for a panel switch for a vehicle.

(Structure of the invention) In order to achieve the above object, the malfunction prevention device for a vehicle panel switch according to the present invention prevents the driver from misoperating a panel switch that outputs an operation signal to an electronic device mounted on a vehicle via an output circuit. Alternatively, in the malfunction prevention device for a vehicle panel switch that prevents malfunctions due to vehicle vibrations, etc., the panel switch has a first position that covers the operation surface of the panel switch and a second position that exposes the operation surface. and a malfunction prevention circuit that detects that the shielding means is in the first position and prohibits output from the output circuit. There is.

According to the above configuration, the object of the present invention is completely achieved.

(Example) Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

Figure 2 is a diagram showing the first embodiment of the malfunction prevention device for a vehicle panel switch according to the present invention;
The figure is a circuit diagram showing an embodiment of the malfunction prevention circuit used in the device of the embodiment. Note that parts similar to those in the basic configuration shown in FIG. 1 are given the same reference numerals.

The opening of the case 1 is covered with a cover sheet 2, and key tops 3 and light guide plates 4 are alternately arranged within the opening. Characters such as "AC ON", "AC AUTO", and "AC OFF" are drawn on the key top 3. A printed board 5 is attached to the back side of the opening of the case 1, and a contact 6 is attached to the printed board 5. A spring rubber 7 is inserted between the key top 3 and the printed board 5.
A conductor rubber 8 is provided on the spring rubber 7 so as to face the contact 6.

The cover 9 is pivotally supported on the main body 1, and the cover 9
You can press key top 3 when opening the
When the cover 9 is closed, it is physically impossible to press the key top 3. The cover 9 is normally closed, and can be opened by pressing the open switch 11 when desired. The operation confirmation switch 10 is a switch that detects and outputs that the cover 9 is closed. The operation confirmation switch 10 is also a switch having the same configuration as the other switches 3a to 3c.

In FIG. 3, switches SW ₁ to _{SW 3} correspond to panel switches 3a to 3c, respectively.
SW ₄ is a switch corresponding to the operation confirmation switch 10. Switch SW ₁ ~ _{SW 3} is inverter In ₁ ~
Each is connected to one input terminal of NAND gates NAND ₁ to NAND ₃ via In ₃ . Switch SW ₄ has each NAND gate NAND ₁ ~
Connected to the other input terminal of NAND ₃ . The outputs of NAND gates NAND ₁ to NAND ₃ are output terminals.
Switch 3a via OUT ₁ to OUT ₃ respectively
It is connected as an ON, AUTO, and OFF signal to the control circuit of the air conditioner, which is the object of operation in 3c.

Next, the operation of the vehicle panel switch malfunction prevention device according to the present invention will be explained.

When the cover 9 is closed, the operation confirmation switch 10, that is, the switch _SW4 is closed, and a low level signal is input to the other input terminals of the NAND gates _NAND1 to _NAND3 . Therefore, due to vibration etc., the switch SW ₁ ~
Even if SW ₃ is closed, a high level signal is sent to the NAND gates NAND ₁ to NAND via inverters In ₁ to In ₃ .
Since it is connected to one input terminal of NAND ₃ , the outputs of NAND gates NAND ₁ to NAND ₃ become high level and do not operate. Furthermore, since the cover 9 is closed, there is no possibility of accidentally operating the switches 3a to 3c.

By pressing the open switch 11, the cover 9 opens, and when the operation confirmation switch 10, that is, the switch SW ₄ is opened, the NAND gates NAND ₁ to
A high level signal is input to the other input terminal of NAND ₃ . Therefore, switches SW ₁ to _{SW 3}
When any one of the switches is closed, a high-level signal is input to one input terminal of the corresponding NAND gates NAND ₁ to NAND ₃ via the corresponding inverters In ₁ to In ₃ , so that the output becomes low level and is output as each operation signal.

FIG. 4 is a diagram showing a second embodiment of the malfunction prevention device for a vehicle panel switch according to the present invention.

In the second embodiment, a cover is attached to a switch panel. 4A and 4B show the cover in a closed state, and FIG. 4C and D show the cover in an open state.

A case 22 is inserted into the lower side of the case 21, and a cover 23 is pivoted to the upper side of the case 21 so that it can be opened to one side (FIG. 4B). The key films 24 and 25 are provided on the upper surface of the case 21, and only the key film 25 can be covered with the cover 23. The key film 24 is provided with a plurality of changeover switches 24a and a reset switch 24b. The key film 25 includes a panel switch 25a including a numeric keypad, etc.
(Fig. 4C). A printed board 26 is housed in the case 21, and a switch sheet 27 with conductive rubber is provided corresponding to the panel switch 25a and the like. A printed board 28 is arranged below the printed board 26.
8 is provided with a rubber socket lamp 29. 30 is a lamp pin, and 36 is a coupler (Fig. 4B).

As shown in FIG. 4D, the cover 23 is pivotally supported by a shaft 31, and can be opened 120 degrees clockwise around the shaft 31. The spring 39 is a spring that biases the cover 23 in the opening direction. A magnet 32 is provided on the cover 23. A reed switch 33 provided on the printed board 28 is turned on when the cover 23 is closed and the magnet 32 approaches, and constitutes an operation confirmation switch. Button 34
The key portion 34a is engaged with the V-groove 23a of the cover 23. cover 23 by pressing button 34
The cover 23 can be opened by being disengaged and biased by the spring 39. The button 34 is urged in the protruding direction by a spring 35.

Since the cover 23 is closed in the non-operation mode, the panel switch 25a cannot be physically operated due to the cover 23. Furthermore, since the magnet 32 of the cover 23 is close, the operation confirmation switch 33 is turned on, and a malfunction prevention circuit similar to that shown in FIG. 3 is activated. Therefore, even if the panel switch 25a is turned on due to vibration or the like, no operating signal is connected to the electronic equipment (not shown).

Press button 34 to select the operating mode.
The key part 34 of the button 34 resists the biasing force of the spring 35.
a is pulled in and the cover 23 is disengaged from the V-groove 23a, so the cover 23 is opened by the spring 39. When the cover 23 is opened, the magnet 32 of the cover 23 is separated, and the operation confirmation switch 33 is turned off. Therefore, the malfunction prevention circuit similar to that shown in FIG. 3 is released, and the operation signal of the panel switch 25a is connected to an electronic device (not shown).

FIG. 5 is a diagram showing a third embodiment of the malfunction prevention device for a vehicle panel switch according to the present invention.

The third embodiment shows an example in which the switch panel itself is retractable. 5A and 5B show the switch panel in a protruding state, and FIGS. 5C and 5D show the switch panel in a retracted state.

The back surface of the case 41 is covered by a case 42. A slide case 43 is slidably provided in the case 41. Slide case 4
A key film 44 is provided on the upper surface of 3, and a button 46 is arranged between frames 47 below the key film 44. Switch sheets 57 are provided below the buttons 46, and the switch sheets 57 are provided on the printed board 49. The slide case 43 is urged in the protruding direction by a spring 60. 53 is an LED for illuminating the button 46. 56 is an operation confirmation switch that is turned on when the slide case 43 pops out. 50 is a printed board, 59
is a coupler (Fig. 5 A, B).

The front surface of the key film 45 is exposed, and a changeover switch 45a and a reset switch 45b are provided. The changeover switch 45a has the same structure as the other switches, and is composed of a frame 48, a switch seat 58, and the like. 51, 52
is a printed board, 54 is a rubber socket lamp, 55
are lamp pins (Fig. 5 C, D).

When in non-operation mode, the slide case 43
Store it. Therefore, the button 46 cannot be pressed, and erroneous operation by the driver or the like is prevented. At this time, the slide case 43 is locked by a locking mechanism including a heart tom, a pin case, etc. (not shown). Since the slide case 43 is stored, the operation check switch 56 is on, and the malfunction prevention circuit similar to that shown in FIG. 3 is activated.
Even if the button 46 is closed due to a malfunction such as vibration, the operation signal is blocked.

When the slide case 43 is pushed, the operating mode is entered, a stop mechanism (not shown) is unlocked, and the slide case 43 is popped out by the spring 60. At the same time, the operation confirmation switch 56 is turned off, and the third
The malfunction prevention circuit similar to the diagram is released and the button 46
The operation signal is connected to an electronic device (not shown).

(Effects of the invention) As explained in detail above, according to the invention, when the panel switch is in the non-operation mode, there is no possibility of accidentally operating the panel switch with the cover, etc. At that time, the malfunction prevention circuit is activated to prevent malfunction due to vehicle vibration, etc. This was avoided and the vehicle panel switch now works reliably. Furthermore, this invention also provides dustproofing for panel switches.
It also has the effect of contributing to waterproofing, etc.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the basic configuration of a panel switch. FIG. 2 is a diagram showing a first embodiment of a malfunction prevention device for a vehicle panel switch according to the present invention, and FIG. 3 is a circuit diagram showing an embodiment of a malfunction prevention circuit used in the same embodiment device. . FIG. 4 is a diagram showing a second embodiment of the malfunction prevention device for a vehicle panel switch according to the present invention. FIG. 5 is a diagram showing a third embodiment of the malfunction prevention device for a vehicle panel switch according to the present invention. 1... Case, 2... Cover sheet, 3... Key top, 4... Light guide plate, 5... Printed board, 6... Contact, 7
... Spring rubber, 8... Conductive rubber, 21... Case, 22... Case, 23... Cover, 24... Key film, 25... Key film, 26... Printed board, 27... Switch sheet, 28... Printed board,
29...Rubber socket lamp, 30...Lamp pin,
31...Shaft, 32...Magnet, 33...Reed switch, 34...Button, 35...Spring,
36...Coupler, 37, 38...Frame, 39...Spring, 41...Case, 42...Case, 43...
Slide case, 44...key film, 45...key film, 46...button, 47...frame, 4
8... Frame, 49-52... Printed board, 53...
LED, 54...Rubber socket lamp, 55...Lamp pin, 56...Operation confirmation switch, 57...Switch seat, 58...Switch seat, 59...Coupler, 60...Spring.

Claims (1)

[Scope of utility model registration request] In a malfunction prevention device for a panel switch for a vehicle, which prevents a panel switch that outputs an operating signal to an electronic device mounted on a vehicle from an erroneous operation by a driver or from a malfunction due to vibration of the vehicle, the panel switch outputs an operation signal through an output circuit. On the other hand, a shielding means is capable of maintaining a relative positional relationship between a first position that covers the operation surface of the panel switch and a second position that exposes the operation surface; 1. A malfunction prevention device for a vehicle panel switch, comprising a malfunction prevention circuit that detects that the switch is in the position and prohibits output from the output circuit.