JPH0328340B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electric mirror device attached to a vehicle or the like that can change the viewing angle of a mirror portion using a drive unit incorporating a motor.

(Prior art) As typified by vehicle door mirrors, the rear surface of the mirror part is swingably supported, and the mirror part is tilted around the support part using a drive unit containing a motor and a gear mechanism. 2. Description of the Related Art Electric mirror devices that can change vertical and horizontal viewing angles are known.

By the way, as mentioned above, this type of electric mirror device has a built-in motor, especially a DC motor that operates on battery power, so sparks are generated from the brush inside the motor during operation, and this can cause damage to the radio receiver installed in the vehicle. There was a problem with the noise source.

Conventionally, in order to prevent this noise, a capacitor was connected between the motor terminal and the ground to remove the high frequency current (noise signal) generated by the spark. However, such conventional noise countermeasures require a separate capacitor, which has the drawback of increasing the size and cost of the drive unit due to the installation space.

(Object of the Invention) The object of the present invention is to improve this type of electric mirror device in order to eliminate the above drawbacks, eliminate the need for separate parts for noise suppression, and reduce the size and cost of the drive unit. It is an object of the present invention to provide an electric mirror device that can effectively prevent noise while reducing noise.

(Structure of the Invention) The present invention is applied to an electric mirror device in which the viewing angle of the mirror section can be changed using a drive unit with a built-in motor, and its main structure is that the storage case of the drive unit is made of a conductive material. The storage case is grounded to the vehicle body to provide a shielding effect to the entire storage case.

(Example) Below, preferred examples that further embody the present invention will be listed and explained in detail with reference to the drawings.

In the drawings, FIG. 1 is a front view of the electric mirror device according to the present invention with the mirror section removed, and FIG.
FIG. 3 is a side view of the vicinity of the drive unit in the direction of arrow A in the figure, and FIG. 3 is a sectional view taken along the line B--B in FIG.

First, in order to clarify the present invention, FIGS.
The overall schematic configuration of the electric mirror device will be described with reference to the drawings. The device indicated by the reference numeral 1 in the figure is a so-called door mirror attached to the side surface of an automobile door. The device 1 consists of a base member 2 that is attached and fixed to the side surface of a door, and a mirror body 3 that is separate from the base member 2 and is elastically supported and can be tilted back and forth. This mirror body 3 has a housing 4 formed in the shape of a case with a front opening on its outer side, and a drive unit 6 is housed in a central opening 5a of a support plate 5 fixed inside the housing 4. is fixed to the support plate 5 with screws 7. Further, one ends of the coil springs 8a, 8b are hooked to the upper and lower parts 5b, 5c of the support plate 5,
The other ends of the springs 8a, 8b are hooked to both ends of the connecting plate 9. The center of the connecting plate 9 is further swingably connected to the base member 2 via a link member 10, so that the mirror body 3 is always urged against the base member 2 by the tension of the springs 8a and 8b. By being in pressure contact with the mirror body 3, the mirror body 3 can be tilted forward or backward when an external force exceeding a specified value is applied to the mirror body 3.

On the other hand, the drive unit 6 is hermetically sealed in a storage case 11 that forms this enclosing part, and a support part 12 provided on the outer surface 11a of this storage case 11 has a back surface of a mirror part 13 shown by a phantom line in FIG. support. As shown in FIG. 3, for example, this support part 12 connects a hemispherical plate part 21 on the mirror part 13 side to a hemispherical concave part 20 formed on the outer surface 11a of the storage case.
The structure is such that the holding member 23 having a structure is used to hold the holding member 23 in a sandwich-like configuration.

It also includes a pair of operating rods 14 and 15 that protrude and retract from the storage case 11 in a positional relationship that is approximately perpendicular to the support portion 12, that is, near the right side and near the bottom of the support portion 12, The tips of each of the operating rods 14, 15 are connected to the back surface of the mirror portion 13 by swingable ball joints 14a, 15a. On the other hand, the operating rod 14 is sequentially connected inside the storage case 11 to a gear mechanism 16 consisting of a motion direction conversion gear, a reduction gear, etc., and further to a motor 17, and the operating rod 15 is also connected to a similar gear mechanism 18 and a motor 19. Connect sequentially to As a result, the motor 17,1
By forward and reverse rotation of the mirror 9, the operating rods 14 and 15 are moved in and out of the case 11 via the gear mechanisms 16 and 18, thereby making it possible to change the viewing direction angle of the mirror portion 13.

Next, the main structure of the present invention will be explained with reference to FIGS. 4 to 7. Figure 4 is an inner view of the front case half of the drive unit storage case.
Figure 5 is a sectional view taken along line C-C in Figure 4, Figure 6 is an inner view of the rear case half of the storage case, and Figure 7 is
The figure is a side view in the direction of arrow D in FIG. 6.

The drive unit 6 described above has the motors 17 and 19, which are electrical components, housed in a sealed storage case 11 to protect them from rainwater, car wash water, splashing water, and the like. This storage case 11 consists of a combination of a front side case half 30 shown in FIG. 4 and a back side case half 50 shown in FIG. The front case half 30 consists of a concave storage section 31 and a bank-like abutment section 32 around the concave storage section 31. On the other hand, the rear side case half 50 similarly consists of a concave storage section 51 and an abutment section 52 provided around the concave storage section 51 in the shape of a bank. Furthermore, each of the case halves 30 and 50 is made of a conductive member. A conductive member can be integrally molded with a conductive resin material, for example, or can be integrally molded with an ordinary insulating synthetic resin and subjected to conductive plating treatment on the entire surface, or can be made of an insulating synthetic resin. It may be integrally molded and covered with a conductive rubber (sheet) etc. which also serves as a seal.

Note that the inner surface of each storage section 31, 51 is connected to the motor 1.
7, 19, and storage recesses 31a..., 51 that also serve as positioning for arranging gear mechanisms 16, 18, etc.
a..., mounting portions 31b..., 51b... are formed. In addition, each motor 17, 19 is connected to each case half 3.
Electrical insulation treatment is applied to the 0 and 50 sides.

On the other hand, this storage case 11 is grounded to the vehicle body side when the mirror device 1 is assembled. In other words, if the entire storage case 11 is made of a conductive resin material, as is clear from FIG.
Storage case 11 → screws 7... → support plate 5 → coil springs 8a, 8b → connection plate 9 → link member 10 → base member 2 → car body The storage case 11 and the car body become electrically connected and can be simply assembled. The storage case 11 is grounded to the vehicle body. Alternatively, the storage case 11 may be directly connected to the vehicle body through a ground wire. In this case, the negative electrode side wiring connected to the motor can be used.

By configuring as above, the storage case 11
is in a grounded state, that is, in the vehicle body, the negative electrode of the battery is normally grounded, so the potential is zero, and the entire storage case 11 has a shielding function. In particular, since the storage case 11 is formed in a sealed state as described above, its shielding function is perfect, and high frequencies caused by sparks generated inside the storage case 11 will not be transmitted to the outside, causing noise to be mixed into radio receivers, etc. Negative effects can be effectively removed.

In the above embodiment, the case where the mirror body 3 including the housing 4 is rotated directly by a motor is shown. In the device, etc., the case portion of the drive unit housing the motor may be made of a similar conductive material, and any other changes may be made in the detailed shape, configuration, etc. without departing from the gist. permissible within the scope of the present invention.

(Effects of the Invention) As described above, the electric mirror device according to the present invention does not require any separate parts such as a capacitor for removing noise signals caused by sparks generated from the motor, so the drive unit can be made smaller and lower in cost. It is possible to achieve effective noise prevention while also achieving a reduction in noise.

[Brief explanation of drawings]

FIG. 1 is a front view of the electric mirror device according to the present invention with the mirror section removed, FIG. 2 is a side view of the vicinity of the drive unit in the direction of arrow A in FIG. 1, and FIG. 3 is a B-B in FIG. 1. Figure 4 is a line sectional view, and Figure 4 is an inner view of the front case half of the storage case for the drive unit.
The drawings are a sectional view taken along the line CC in FIG. 4, FIG. 6 is an inner view of the rear case half of the storage case, and FIG. 7 is a side view taken in the direction of arrow D in FIG. 6. In the drawing, 6 is a drive unit, 11 is a storage case, 17 and 19 are motors, 30 is a front case half, and 50 is a back case half.

Claims (1)

[Claims] 1. In an electric mirror device in which the viewing angle of the mirror part can be changed using a drive unit with a built-in motor, the surrounding part forming the outer shell of the drive unit is formed of a conductive member, and the surrounding part is grounded to the vehicle body. An electric mirror device characterized by: