JPH0375364B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a drive circuit for an electrically foldable door mirror that can be raised and lowered by driving a motor.

[Conventional technology]

Generally, in this type of electrically foldable door mirror, a motor is driven in response to the operation of an operating member provided in the vehicle interior so that the raised and folded door mirrors can be operated from within the vehicle interior.

[Problem that the invention seeks to solve]

However, in such conventional devices, the motor is generally driven only while the operating member is being operated, so it is necessary to raise or lower the door mirror to a predetermined raised or lowered position during that time. There are problems in that the operation member must be continuously operated, which is troublesome and cumbersome, and inconvenient to handle.

This invention solves the above-mentioned problems of the conventional devices, and eliminates the need to continue operating the operating member until the door mirror reaches a predetermined position.Moreover, the present invention can be activated immediately as needed while the door mirror is being raised or lowered. It is an object of the present invention to provide a drive circuit for an electrically foldable door mirror that can stop the door mirror, and then operate the door mirror either upright or down.

[Means for solving problems]

In order to achieve the above object, the present invention provides an electrically foldable door mirror that can be raised and lowered by driving a motor driven by the operation of an operating member. a timer means for driving the motor in the upright direction during a predetermined time; a timer means operated by the operation of the operating member to drive the motor in the lodging direction for a predetermined time; A device comprising means for stopping the operation of the timer means when operated, and means for maintaining either of the timer means in an operable state when the operating member is operated after the stopping means has been operated. It is.

[Effect]

This invention employs the above means, so that when the timer means is operated by operating the operating member, the timer means then drives the motor for a predetermined period of time to raise the door mirror to a predetermined upright position or folded down position. If the operation member is operated while the timer means is operating, the motor will stop and the operation of the door mirror will be stopped immediately.If the operation member is operated after that, the door mirror will be raised or lowered. It will be operated in the direction of.

〔Example〕

Embodiments of the invention shown in the drawings will be described below.

FIG. 1 shows an embodiment of the present invention, in which numeral 31 is an automatic return seesaw type operation switch that can selectively close contacts 32 and 33, 39 is a NAND circuit 40,
41 and a logic IC comprising a NOR circuit 43, 44,
45 has both B input and CD input "H",
And when the A input rises from "L" to "H", the timer operation is started and the Q output is kept "H" for a predetermined period of time, and when the CD input becomes "L" during the timer operation, it is reset and the Q output is reset. A timer IC whose output is set to "L"; 46 and 47 are transistors that are turned on during the operation of timer ICs 44 and 45, respectively; 48 and 49 are transistors 46 and 4, respectively;
A relay 52 is a motor circuit that is built into a door mirror (not shown) attached to the door of the vehicle and connected between the contacts 50 and 51. Although the details of the motor circuit 52 are omitted from illustration,
A motor that lowers (or raises) the door mirror when current flows from contact 50 to contact 51 and raises (or lowers) the door mirror when current flows from contact 51 to contact 50; A limit switch (not shown) is provided that opens the motor circuit 52 when the motor reaches a predetermined lowered position or raised position. The operating time of the timer ICs 44 and 45 is set, for example, to be slightly longer (for example, about 20 seconds) than the time required for the motor circuit 52 to lower the door mirror from the forward position to the lowered position.

The logic IC 39 is connected to one of the timer ICs 4
When the operation switch 31 is operated during the operation of steps 4 and 45, after stopping the operation of the timer IC,
Both timer ICs are kept in an operable state.

The A input of the timer ICs 44 and 45 is "L".
And the CD input is "H", and the B input is "H"
When the timer falls to "L", the timer operation is started and the Q output is set to "H" and "L" for a predetermined period of time, and the CD input is reset to "L" during the timer operation, and the Q output is set to "L". is set to "L" and "H".

Next, the operation of the above circuit will be explained.

In this drive circuit, when V _DD rises when the power supply is connected, timer ICs 44 and 45 do not start timer operation because their B inputs are "H".
Q output is initialized to "L" and "H". timer
Since the outputs of the ICs 44 and 45 are both "H", both inputs of the NAND circuits 40 and 41 are "H", so the output of the logic IC 39, that is, the output of the NOR circuit 43, is kept "H". The CD inputs of timer ICs 44 and 45 are both initially set to "H".

When the operating switch 31 is closed to the contact 32 side in this state, the B input of the timer IC 44 falls from "H" to "L" and one input of the NAND circuit 41 also becomes "L", and at this time, the A of the timer IC 44 The input is originally “L” and the CD input is NAND
Since the output of the NOR circuit 43 from the circuit 40 is sure to be "H", the timer IC 44 starts the timer operation and makes the Q output "H" and "L", while the timer IC 45 has the B input "H". Therefore, both transistors 46, 4 are kept in the initial state.
Among the transistors 7, only the transistor 46 is turned on reliably, energizing the relay 48 and switching the contact 50 to the power supply side, thereby operating the motor circuit 52 and invariably lowering the door mirror. This timer
While the IC44 timer is operating, its output is “L”
Therefore, one input of the NAND circuit 41 is always kept at "L".

Also, when the operation switch 31 is closed to the contact 33 side, the B input of the timer IC 45 changes from "H" to "L".
At the same time, one input of the NAND circuit 40 becomes "L", and at this time, the A input of the timer IC 45 is originally "L", and the CD input is reliably "H" by the output of the NOR circuit 43 from the NAND circuit 41. Therefore, the timer IC45 starts the timer operation and sets the Q output to "H", while the timer IC44
is kept in the initial state because the B input is “H”,
Therefore, only the transistor 47 of the two transistors 46 and 47 is turned on reliably, energizing the relay 49 and switching the contact 51 to the power supply side, thereby operating the motor circuit 52 and making sure to raise the door mirror. While the timer IC45 is operating, its output is "L".
One input of the NAND circuit 40 is always kept at "L".

For example, when the operation switch 31 is closed to the contact 33 side while the timer IC 44 is operating, one input of the NAND circuit 40 becomes "L", and at this time, one input of the NAND circuit 41 is kept at "L". Therefore, the output of the NOR circuit 43, that is, the output of the logic IC 39 is inverted and becomes "L", and therefore the CD input of the timer IC 44 becomes "H".
Since the timer IC 44 immediately stops the timer operation, the contact 50 returns to the ground side via the transistor 46 and the relay 48, and the motor circuit 52 immediately stops the door mirror folding operation. On the other hand, due to the closing of the contact 33 side of the operation switch 31, the timer IC 45 is
The input falls from "H" to "L", but at this time, the CD input of the timer IC45 also becomes "L" due to the output of the logic IC39, so the timer IC45 does not start timer operation and the output is It is kept at "L" and "H". As a result, in response to the next operation input from the operation switch 31, either the timer ICs 44 or 45 can be operated in any desired state.

In addition, if the operation switch 31 is closed to the contact 32 side while the timer IC 45 is operating,
One input of the NAND circuit 41 becomes "L",
At this time, one input of the NAND circuit 40 is "L"
Therefore, the output of the NOR circuit 43, that is, the output of the logic IC 39, is inverted and becomes "L".
Therefore, since the CD input of the timer IC 45 falls from "H" to "L", the timer IC 45 immediately stops the timer operation, and as a result, the contact 51 returns to the ground side via the transistor 47 and the relay 49, and the motor circuit 52 immediately stops the door mirror from rising. On the other hand, the B input of the timer IC 44 falls from "H" to "L" due to the closing of the contact 32 side of the operation switch 31;
The CD input of 44 is also set to "L" by the output of logic IC39.
Therefore, the timer IC 44 does not start the timer operation, and the output is kept at "L" and "H".
As a result, in response to the next operation input from the operation switch 31, either the timer ICs 44 or 45 can be operated in any desired state.

The above operation is shown in a time chart in FIG.

〔Effect of the invention〕

Since the present invention is configured as described above, when the timer means is operated by operating the operating member, the timer means thereafter drives the motor for a predetermined period of time to raise the door mirror to a predetermined upright position or folded down position. Therefore, it is not necessary to continue operating the operating member until the door mirror reaches a predetermined position, and the handling is simple and easy, and it can be activated immediately if necessary while the door mirror is being raised or lowered. In addition to being able to stop the door mirrors, the door mirrors can then be operated to either stand up or fall down, making it possible to achieve all operating modes required for raising and folding the door mirrors simply by operating the operating member. It has excellent effects such as being able to

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a time chart showing the operation of the circuit shown in FIG. 31...Operation switch, 32, 33...Contact, 39
...Logic IC, 40, 41...NAND circuit, 43...
NOR circuit, 44, 45...Timer IC, 46, 47
...Transistor, 48,49...Relay, 50,5
1...Contact, 52...Motor circuit.

Claims (1)

[Scope of Claims] 1. In an electrically foldable door mirror that can be raised and lowered by driving a motor driven by the operation of an operating member, the motor is raised and lowered for a predetermined period of time by operating the operating member. a timer means for driving the motor in the lodging direction for a predetermined period of time; and a timer means for driving the motor in the lodging direction for a predetermined period of time when the operating member is operated, and the operating member is operated while one of the timer means is operating. and means for holding both the timer means in an operable state after stopping the operation of the timer means. 2. The drive circuit for an electrically foldable door mirror according to claim 1, wherein the operating member comprises a seesaw type automatic return switch. 3. The holding means becomes ready to receive operation input from the operating member when one of the timer means starts operating, and when the timer means stops operating, the holding means becomes ready to receive the operation input from the operating member when the timer means stops operating. 2. The drive circuit for an electrically foldable door mirror according to claim 1, comprising a logic IC that enables any of the timer means to operate in response to an input.