JPH0115545Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an automobile anti-glare mirror. In particular, the present invention relates to an automobile anti-glare mirror that prevents dazzling caused by the headlights of vehicles following at night by automatically switching the reflective surface during the daytime and at night.

Conventionally, in this type of auto-dimming mirror, for example, one having a structure as shown in FIG. When the electromagnets b and b' corresponding to Magnets a, a' and electromagnets b, b' were arranged as partners, and a prism mirror c was tilted about a rotation axis e to switch the reflecting surface. Note that f is a stay that rotatably pivots the mirror housing d and attaches it to the vehicle body.

In such a conventional example, at least one set (a, b=
a', b') are required, and in order to repel the attracting side, it must be repelled against the attraction force of the permanent magnet a that is not energized or the permanent magnets a' and a that are attracted to a'. Electromagnet b or b' requires considerably large power consumption. Further, when switching the prism mirror c, an impact noise is generated on the permanent magnets a, a' and the electromagnets b, b', and when switching becomes frequent, the generated noise becomes noisy.

In view of the above circumstances, the present invention uses a drive motor, a speed reduction mechanism, and a cam to switch prism mirrors with low power consumption, and is an automatic dimming device that does not generate impact noise when switching prism mirrors. It provides a mirror.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

Figure 2 is a cross-sectional view of the main part of the present invention, and Figures 3 and 4 are longitudinal cross-sectional views of the present invention. This shows the state in which the

In the figure, reference numeral 1 denotes a mirror housing, which is rotatably pivoted to a pivot 51 formed at the tip of a stay 5 attached to the vehicle body (not shown) by a seat 16 recessed in the upper part of the mirror housing 1. has been done. A tightening screw 12 generates a tightening torque between the pivot 51 and the seat 16 of the mirror housing 1. 2 is a mirror body,
A mirror 3 is fixed to the front surface, and a rotating shaft 21 is provided on the upper end side of the back surface, and a metal plate 4 is provided on the lower end side. The rotating shaft 21 is pivotally mounted to the mirror housing 1 so as to be rotatable. The reflective surface switching mechanism according to the present invention is configured as follows.
That is, 6 is a drive motor that drives a mirror body 2 defined in the mirror housing 1 by an arbitrary configuration.
and the rear surface of the mirror housing 1. A worm gear 7 is fitted onto the rotation shaft of the drive motor 6 and transmits the rotation of the drive motor 6 to the gear 8. The gear 8 is a core shaft 8
1 is provided, and its upper end is pivoted to a bearing 17 which is provided protruding inside the back surface of the mirror housing 1, and its lower end is pivoted to a bearing 14 which is provided inside the lower wall of the mirror housing 1 so as to serve as a rotation fulcrum. Gear 8 at the bottom
2 is engraved.

Reference numeral 9 is a circular cam, and an arcuate gear 91 is carved on the back side of the mirror housing 1, and a flat portion 92 formed by cutting the arcuate portion is provided at the corresponding circumferential edge. Two stopper pins are provided protruding from the side surface of the circular cam 9. That is, when the flat part 92 of the circular cam 9 makes surface contact with the metal plate 4 formed on the back surface of the mirror body 2, the stopper pin 1 for night switching comes into contact with the stopper 15 protruding from the lower wall of the mirror housing 1.
1 (FIG. 3) and a flat portion 92 facing upward, and a stopper pin 10 for daytime switching, with which the arcuate portion 93 of the circular cam 9 abuts, is protruded from the metal plate. The stopper 15 is disposed between them. Therefore, the two stopper pins 1
The angle formed by 0, 11 and the central axis 94 of the circular cam 9 is the switching angle of the reflecting surfaces 22, 23.

A tension spring 13 is supported by the mirror housing 1 and the mirror body 2, and constantly pulls the mirror body 1 toward the inside of the mirror housing 1 to press the metal plate 4 against the circular cam 9. The worm gear 7, the gears 8 and 82, and the gear 91 formed on the circular cam 9 constitute a deceleration mechanism that decelerates the rotation of the drive motor 6.

Therefore, the present invention will be implemented from daytime to 3rd hour as shown in Figure 2.
In order to switch to the nighttime mode as shown in the block diagram of FIG. 5, the nighttime condition is detected by the optical center A, and the switch S is activated to rotate the drive motor 6, using a deceleration mechanism. Worm gear 7, gear 8,
82, circular cam 9 via gear 91 of circular cam 9
Rotate. Then, when the rotation of the circular cam 9 and the gear 91 stops after tilting by a certain angle (reflection surface switching angle), the drive motor 6 becomes locked, an overload current is generated, and the current is overloaded. It is detected at the center ○ and ○ and the electric circuit is turned off to stop the rotation of the drive motor 6 and change the reflective surface.

Therefore, when switching between the reflective surfaces 22 and 23 of the prism mirror, the switching is achieved with a small amount of electric power for driving the drive motor 6, which saves labor.Moreover, since the switching is continuous using the circular cam 9, the switching is particularly easy. No large impact noise is generated at times, and no unpleasant noise is given to the driver during use. Further, since the circular cam 9 comes into contact with the metal plate 4 formed on the back surface of the mirror body 2, good results can be obtained in terms of wear resistance and the like. Furthermore, at night as shown in FIG. 3, when the mirror body 2 approaches the inside of the mirror housing 1, the force exerted by the tension spring 13 to press the metal plate 4 against the circular cam 9 is reduced, but the flat portion 92 of the circular cam 9 is By making surface contact with the metal plate 4, vibration of the mirror body 2 is prevented by compensating for the reduced pressure contact force. Furthermore, since the gear 91 that meshes with the gear 82 of the reduction mechanism is integrally carved into the circular cam 9, the number of parts, assembly man-hours, and cost can be reduced, and the structure is simplified, so that vibration elements can be reduced. is reduced, and the vibration-proofing effect is increased accordingly. Furthermore, since the drive motor 6 is temporarily held in a restrained state while being energized when it is stopped, the entire power transmission system is stopped in a state where it is biased in the direction of rotation.
The vibration of the mirror body 2 is prevented by absorbing the rattling of each part.

The present invention provides an auto-dimming mirror having a reflective surface switching mechanism that automatically tilts the prism mirror around an axis formed in the horizontal and longitudinal direction as described above, wherein the reflective surface switching mechanism is bonded to the back surface of the prism mirror. a circular cam having a flat portion in surface contact with the metal plate and having a gear carved on an arc; a reduction mechanism having a gear meshing with the gear of the circular cam; and rotating the reduction mechanism. a drive motor, a spring that presses a metal plate on the back surface of the prism mirror against the circular cam, and a position where a flat part of the circular cam abuts the metal plate and an arcuate part of the circular cam abuts the metal plate. a stopper that stops the rotating circular cam at the stopped position; and an overload center that detects an overload current generated in the drive motor when the circular cam is stopped by the stopper and stops the rotation of the drive motor. Because of this, the reflective surface of the prism mirror can be switched smoothly with low electrical power and does not generate any unpleasant noise during switching, and has excellent vibration resistance and stability after switching. It is.

It should be noted that, as a matter of course, the present invention is not limited to the above-mentioned embodiments.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a conventional example. 2 to 4 show the auto-dimming mirror of the present invention. FIG. 2 is a longitudinal sectional view during daytime, FIG. 3 is a longitudinal sectional view during nighttime, and FIG. 4 is a longitudinal sectional view during daytime. Main part cross-sectional view, No. 5
The figure is a block diagram showing the operating state. DESCRIPTION OF SYMBOLS 1... Mirror housing, 2... Mirror body, 21... Rotating shaft, 3... Mirror, 4... Metal plate, 5... Stay, 6... Drive motor, 7... Worm gear, 8... Gear, 9...Circular cam.

Claims (1)

[Scope of utility model registration request] In an auto-dimming mirror having a reflective surface switching mechanism that automatically tilts the prism mirror around an axis formed in the horizontal and longitudinal direction, the reflective surface switching mechanism includes a metal plate bonded to the back surface of the prism mirror, and a metal plate bonded to the back surface of the prism mirror. a circular cam having a flat portion that makes surface contact with a metal plate and having a gear carved on an arc; a reduction mechanism having a gear that meshes with the gear of the circular cam; and a drive motor that rotates the reduction mechanism.
a spring that presses the metal plate on the back surface of the prism mirror against the circular cam; and a spring that presses the metal plate on the back surface of the prism mirror; An automatic device comprising: a stopper that stops a rotating circular cam; and an overload sensor that detects an overload current generated in the drive motor when the circular cam is stopped by the stopper, and stops the rotation of the drive motor. Anti-glare mirror.