JP2649374B2 - Sun visor lighting unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a sun visor provided on a ceiling portion in front of a driver's seat or a passenger seat of an automobile, and more specifically, a lighting unit for a sun visor provided with, for example, a vanity mirror or the like provided on the sun visor and a certification device therefor. It is related to.

[Prior art]

As a conventional sun visor lighting unit of this type, for example, there is a sun visor lighting unit shown in U.S. Pat.
As shown in the specification of this publication and in FIGS. 7 and 8, a mirror and a cover that covers the mirror so that the mirror can be opened and closed are provided with security contacts that come into contact when the cover is in the open position. The lighting device flashes through the security contact and further through the flashing switch. In this way, when the user forgets to turn off the flashing switch and closes the cover (at this time, The lighting device is also covered by the cover at the same time, and it is impossible for the user to confirm that the lighting device is turned on.) Then, the lighting device is turned off at the security contact, and overheating caused by forgetting to turn off the lighting device is caused. Alternatively, inconvenience such as ignition is prevented in advance.

[Problems to be solved by the invention]

However, since the above-described conventional configuration uses an intermittent contact switch called a slide switch, for example, as a blinking switch,
When the user forgets to turn off the cover and closes the cover, the flashing switch remains in the ON position, which causes a problem in use that the lighting device is turned on regardless of the user's intention at the next use. Had become.

[Means for Solving the Problems]

The present invention, as a specific means for solving the above-described problems, as a lighting device integrated into the sun visor,
In a sun visor lighting unit comprising a lighting device for lighting the lighting device and a security contact for forcibly turning off the lighting device regardless of the operation of the lighting device when the sun visor is in the storage position, Has a self-holding circuit that performs self-holding by a momentary switch, and turns on the lighting device in this self-holding state, and the security contact is provided at a position where the self-holding function of the self-holding circuit is stopped. This object is achieved by providing a sun visor lighting unit characterized in that there is no inconvenience such as unexpected lighting of a user.

【Example】

Next, the present invention will be described in detail based on an embodiment shown in the drawings. The reference numeral 1 in FIG. 1 denotes a sun visor body,
The sun visor body 1 is provided with a cover 5 that covers a part of the mirror 2, the lighting device 3, and the lighting device 4 when the sun visor is closed. By using, for example, a limit switch at an appropriate position such as the hinge portion 5a of the cover 5,
The security contact 6 is provided so as to conduct when in the open position and open when in the closed position. The security contact 6 is connected to a lighting device 4 including a lighting switch 4a and a self-holding circuit 4b. The lighting device 3 is connected to 4. FIG. 2 shows the most basic circuit diagram of the respective electrical connection states of the lighting device 3, the lighting device 4, and the security contact 6. The self-holding circuit 4b has an emitter connected to a power supply V _CC . There is a first stage transistor TR1 of PNP, and a lighting switch 4a of a structure called a momentary switch, which is turned on only while being pressed by a user, is connected to the base of the first stage transistor TR1 with one end grounded. ing. Further, the collector of the NPN rear transistor TR2 is connected to the power supply V _CC via a relay RL having a normally open contact NO to which the lighting device 3 is connected, and the first transistor TR1 is connected to the base of the rear transistor TR2. At the same time, the security contact 6 is connected to the base of the transistor TR1 and the transistor T1
Connected between the collectors of R2. The operation of the lighting device 4 will be described below. First, when the cover 5 is in the open position, that is, in the use state, the security contact 6 is turned on. The transistor TR2 is non-conductive, so that the relay RL does not operate and the lighting device 3 does not operate.
Does not light up. Here, when the user presses the lighting switch 4a to instantaneously conduct, the first-stage transistor TR1 conducts, and at the same time, the first-stage transistor TR1 conducts the second-stage transistor TR2 by the collector current, so that the lighting device 3 is lit. Thereafter, even if the user releases the lighting switch 4a and releases it, the base of the first-stage transistor TR1 is grounded to indicate that the second-stage transistor TR2 is turned on, and performs self-holding.
Will continue to be lit. At this time, if the cover 5 is set to the closed position, the base of the first transistor TR1 is released from the ground state, the first transistor TR1 becomes non-conductive, and at the same time, the second transistor TR2 becomes non-conductive, and the lighting device 3 is turned off. . After that, even if the cover 5 is again opened, unless the user turns on the lighting switch 4a, that is, unless the intention of lighting is expressed, the lighting does not occur regardless of the previous use state. Incidentally, what is indicated by reference numeral 4c in the figure is a light-off switch,
The light-off switch 4c is a momentary switch that is normally turned on and is opened only when pressed by the user, and is designed to be turned off manually if necessary.

【The invention's effect】

As described above, according to the present invention, the lighting device is turned on by the self-holding circuit, and the security contact is provided so as to stop the self-holding function of the self-holding circuit. The lighting unit can always be turned off when it is used again regardless of the previous use state, for example, when the user closed the cover without turning off the light, making the user feel uncomfortable This provides an excellent effect of being able to provide a lighting unit that does not give the image.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sun visor lighting unit according to the present invention incorporated in a sun visor, and FIG. 2 is a wiring diagram showing a circuit example of the same sun visor lighting unit. 1 Sun visor body 2 Mirror 3 Lighting device 4 Lighting device 4a Lighting switch 4b Self-holding circuit 4c Light-out switch TR1 First transistor TR2 Second transistor RL Relay NO ...... Normally open contact 5 ...... Cover 6 ...... Security contact

Continuation of front page (56) References JP-A-59-143717 (JP, A) JP-A 1-132416 (JP, U) JP-B 1-444529 (JP, B2)

Claims (1)

(57) [Claims] 1. A lighting device integrated into a sun visor, a lighting device for lighting the lighting device, and the lighting device forcibly when the sun visor is in a storage position regardless of the operation of the lighting device. In a sun visor lighting unit comprising a security contact for turning off the lighting device, the lighting device self-holds by a momentary switch, and has a self-holding circuit for lighting the lighting device in the self-holding state, and the security contact is A sun visor lighting unit provided at a position where a self-holding function of the self-holding circuit is stopped.