JPS6315069Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a delayed extinguishing device for an interior light of an automobile, which is capable of selecting a delayed extinguishing time for the interior light to be extinguished after the door is closed when the automobile door is closed.

2. Description of the Related Art Delayed light-off devices have been known that use a capacitor and keep an indoor light on after the door is closed until the capacitor is completely discharged. This is convenient on one side, but on the other hand, when driving at night, when you temporarily stop the car, get out, and then get back in the car and start driving again,
The interior lights do not turn off until the capacitor is fully discharged, which can be an inconvenience, as the interior lights that are on can interfere with driving. Also, although it may be convenient to have a long delay before the lights turn off after the door is closed, in some cases, the lights may be on because the door is not completely closed, which makes me feel uneasy. Sometimes I go back to the car to make sure the door is closed.

Therefore, the present invention solves the problem of the conventional case where the delay time is constant by switching the element that sets the delay time using a changeover switch and selecting the delay time according to the need. This will be explained with reference to one embodiment.

Reference numeral 1 indicates a car power battery, 2 indicates an interior light, 3 indicates a door switch, 4 indicates a capacitor, 5 indicates a driver transistor, and 6 indicates a switching transistor. These are used in the same manner as a known delay circuit, and when the door is opened, the door switch 3 is activated. turns ON, and as a result, current flows from driver transistor 5 to switching transistor 6, and both transistors 5 and 6 are turned on.
When turned ON, the interior light 2 lights up, and at the same time, the capacitor 4 is charged during this time. When the door is closed and door switch 3 is turned off, capacitor 4
starts discharging and switches the switching transistor 6.
Since it is kept ON, the indoor light 2 continues to be lit while the capacitor 4 is discharging, and turns off when the capacitor is completely discharged. Generally, current flows through the switching transistor 6 through a fixed resistor 7, and the capacitor 4
The delayed turn-off time of the interior light was kept constant in relation to the charging capacity of the battery and the resistance value of the fixed resistor 7.

In this embodiment, a variable resistor 8 is connected in parallel with the fixed resistor 7 to the switching transistor 6, and the discharge current of the capacitor 4 is switched by a switch 9 via the fixed resistor 7 or the variable resistor 8. 9a is a contact point of a changeover switch for selecting a fixed resistor 7, and 9b is a contact point for selecting a variable resistor.

The maximum resistance value of the variable resistor 8 is set to be less than the resistance value of the fixed resistor 7, and the changeover switch 9 is also provided with a contact 9c for grounding to the vehicle body. As a result, if the contact piece of the changeover switch 9 is placed in contact with the contact point 9a, the delayed turn-off time of the interior light becomes the longest based on the resistance value of the fixed resistor 7. Also, connect the contact piece of the changeover switch to contact 9.
If the variable resistor 8 is placed in contact with the variable resistor 8 and the resistance value of the variable resistor 8 is set as desired using a dial or a lever, the indoor light will be turned off after an arbitrary time period shorter than the delay turn-off time by the fixed resistor 7. If the contact piece of the changeover switch is placed in contact with the contact point 9c, the current is grounded to the vehicle body and the switching transistor 6
Since the current does not flow to the switching transistor 6, the interior lights do not turn on even if the door is opened, and even if the door is closed, the discharge current of the capacitor is instantly grounded to the vehicle body and does not flow to the switching transistor 6, so the lights remain off. .

As described above, according to the present invention, it is possible to select the delay time until the interior light is turned off and turn off the interior light after the necessary time depending on the situation, and in some cases, it is possible to open and close the door. The lights can also be kept off, making it easier to prepare for driving, inspect, and confirm that the door is closed when parking, which has great practical benefits.

[Brief explanation of the drawing]

The drawing is a circuit diagram showing an embodiment of the present invention, and in the drawing, 2 indicates an indoor light and 9 indicates a changeover switch.

Claims (1)

[Scope of claim for utility model registration] When the interior light of a car is turned on when a door is opened and turned off when the door is closed, a capacitor that has started charging when the door is opened is charged at a predetermined time from when the door is closed. A delay for an interior light of an automobile that discharges a discharge according to a constant, and operates a switch means with the discharge current of the capacitor to continue lighting the interior light for a predetermined time determined by the time constant, even after the door is closed. A light extinguishing device; a contact that selects a fixed resistance to fix the time constant related to the discharge of the capacitor at a predetermined value, or a contact that selects a fixed resistance within a smaller range than when the fixed resistor is selected. The contact selects a variable resistor to open the discharge path through which the capacitor discharge current flows to actuate the switch means, while closing a discharge path separate from the discharge path. A delay extinguishing device for an interior light of an automobile, characterized in that it is provided with a changeover switch that can select one of the contact points for selecting a route.