JPH0755171Y2 - Mirror with water drop removal function - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial field of application) The present invention is a water drop removing function that removes water drops adhering to the surface of a mirror glass by using the vibration of an ultrasonic transducer. Regarding attached mirror.

(Prior Art) Conventionally, for example, in a mirror with a water drop removing function for an automobile, the surface of the mirror glass is wiped with a wiper, or a planar heater attached to the back surface of the mirror glass is heated to evaporate the water drops. Was doing. However, the former (wiper mechanism) has a drawback that the structure is complicated and the cost is high, and the latter (planar heater) requires 3 times until the water droplets are completely evaporated.
It has the disadvantage of having to wait for about a minute.

Therefore, in order to eliminate these drawbacks, in recent years, an ultrasonic transducer (plate-shaped piezoelectric element) is attached to the back surface of the mirror glass, and the ultrasonic vibration atomizes and removes water droplets on the surface of the mirror glass. It is thought to do.

(Problems to be solved by the invention) By the way, since the ultrasonic transducer is smaller than the mirror glass, if it is attached directly to the back surface of the mirror glass, the mirror glass can vibrate only locally. This is not possible, and there is a problem that some water droplets remain.

In order to improve this point, the present inventor, as shown in FIG. 3, adheres an ultrasonic transducer 3 to a diaphragm 2 having the same shape as the mirror glass 1 and attaches the mirror glass 1 to the diaphragm 2. It is considered that the peripheral portions of the both are adhered with the adhesive 4 so as to be overlapped. In this way, the vibration of the ultrasonic transducer 3 is transmitted from the outer peripheral bonding portion (adhesive 4) to the mirror glass 1 via the vibration plate 2, so that the entire surface of the mirror glass 1 is effective from the outer peripheral side. It can be expected to improve the water drop removal effect by vibrating.

However, in the case of such a configuration, in order to support the mirror glass 1 on the mirror holder 5, the outer peripheral edge portions of both the mirror glass 1 and the diaphragm 2 are sandwiched so that the fitting groove 6 of the mirror holder 5 is sandwiched. There is no choice but to use a configuration that fits in.

In this configuration, the mirror glass 1 is the edge of the mirror holder 5.
Since it is pressed down by 5a, the vibration of the mirror glass 1 is hindered by the edge portion 5a of the mirror holder 5, which causes a decrease in the water removal capability.

The present invention takes such a situation into consideration. Therefore, the purpose thereof is to prevent the mirror holder from hindering the vibration of the mirror glass, to efficiently vibrate the mirror glass, and to improve the water removal performance. It is to provide a mirror with a water drop removing function that can be effectively exhibited.

[Structure of the Invention] (Means for Solving the Problem) The mirror with a water drop removing function of the present invention mounts the ultrasonic vibrator on the vibration plate and superimposes the vibration plate and the mirror glass on both sides. By bonding the outer peripheral portions to each other in a state where a predetermined gap is formed between them, and transmitting the vibration of the ultrasonic transducer to the mirror glass via the diaphragm, the mirror In a structure in which water droplets on the surface of glass are atomized and removed, the outer peripheral edge of the diaphragm is projected from the outer peripheral edge of the mirror glass, and the outer peripheral edge of the diaphragm is supported by a mirror holder. It has a different structure.

(Operation) The vibration of the ultrasonic oscillator is transmitted to the mirror glass via the diaphragm. In this case, since the mirror holder directly supports only the outer peripheral edge of the diaphragm and supports the mirror glass on the diaphragm, it is possible to keep the mirror glass and the mirror holder in a non-contact state. it can. For this reason, the mirror glass can freely vibrate without interfering with the mirror holder, and the water droplet removal capability due to the vibration is enhanced.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 11 is a mirror glass formed in a spherical shape, 12 is a diaphragm formed of, for example, a glass plate.
Is formed in a spherical shape having the same curvature as that of the mirror glass 11, and its outer dimension is formed to be larger than that of the mirror glass 11 by, for example, about 2 mm. And the diaphragm on the back side of the mirror glass 11
Mirror glass 11 is formed by bonding 12 around each other with adhesive 13 over the entire circumference.
And the diaphragm 12 are joined. In this case, the width of the layer of the adhesive 13 is set to the minimum necessary size (for example, about 1 to 2 mm) to secure the adhesive strength, and the mirror glass 11
Between the mirror glass 11 and the diaphragm 12, a gap of, for example, about 0.5 to 1 mm is formed by a layer thickness of the adhesive 13 so that a planar heater (not shown) can be disposed between the diaphragm 12 and the diaphragm 12. Have secured. In this bonded state, the outer peripheral edge portion of the vibration plate 12 is, for example, 1 m from the outer peripheral portion of the mirror glass 11 over the entire circumference.
It is protruding about m. And this diaphragm 1
In the center of the back surface of 2, for example, lead zirconate titanate (PZT)
Disc-shaped ultrasonic transducer 14 composed of piezoelectric elements such as
It is adhered by 14a. On the other hand, reference numeral 15 is a mirror holder formed by integral molding of plastic, for example, and a fitting groove 16 is formed on the outer periphery of the mirror holder.
The outer peripheral edge of the diaphragm 12 is fitted to the diaphragm 16. In this fitted state, the edge portion 15a of the mirror holder 15 has the mirror glass 1
It is not in contact with 1. Furthermore, the mirror holder 1
5, a protrusion 15b is formed inside, and the diaphragm 12 is sandwiched between the protrusion 15b and the edge 15a of the mirror holder 15, whereby the contact area between the diaphragm 12 and the mirror holder 15 is increased. Is made as small as possible so that the vibration of the diaphragm 12 is not disturbed by the mirror holder 15.

Next, the operation of the above configuration will be described. Mirror glass
When removing the water droplets adhering to the surface of 11, the AC voltage of, for example, 30 to 60 KHz is applied in the thickness direction of the ultrasonic transducer 14. As a result, the ultrasonic transducer 14 vibrates in the lateral direction (plane direction), and the vibration is transmitted to the mirror glass 11 from the peripheral adhesive portion (cured layer of the adhesive 13) via the diaphragm 12. In this case, the mirror holder 15 directly supports only the outer peripheral edge of the vibrating plate 12, and by supporting the mirror glass 11 on the vibrating plate 12, the mirror glass 11 and the mirror holder 15 are not in contact with each other. Since the mirror glass 11 is kept in the state, the mirror glass 11 can freely vibrate without being interfered with by the mirror holder 15, the entire surface is efficiently vibrated from the outer peripheral side, and water droplets are quickly atomized from almost the entire surface of the mirror glass 11. Be removed.

Further, since the mirror holder 15 only fits the vibrating plate 12 having a thickness of one glass plate, this mirror holder 15
15 can also be used as a mirror without a water drop removing function, which can contribute to standardization of parts and cost reduction.

By the way, when the diaphragm 12 is fitted into the fitting groove 16 of the mirror holder 15 at the time of assembly, the mirror holder 15 made of plastic is used.
Since the outer peripheral portion of is heated and softened and its edge portion 15a is expanded in the direction of arrow A in FIG. 1 to fit the diaphragm 12 into the fitting groove 16, the dimension B of the edge portion 15a is Is smaller, it is easier to fit the diaphragm 12. However, when fitting two glasses 1 and 2 as shown in FIG. 3, as the thickness dimension C increases, the dimension D of the edge portion 1a must be increased from the viewpoint of securing strength, Therefore, there is a drawback that it becomes difficult to perform the glass fitting operation. In this regard, in the above-described embodiment, one vibration plate 12 is provided in the fitting groove 16 of the mirror holder 15.
Since the size B of the edge portion 15a can be reduced, the work of fitting the diaphragm 12 can be easily performed, and the assembly efficiency can be improved.

Since the vibrating plate 12 is formed of the glass plate in the above-described embodiment, there is an advantage that the vibrating plate 12 and the mirror glass 11 have the same coefficient of thermal expansion, and the stress due to the thermal expansion can be prevented.
However, the diaphragm 12 is not limited to the glass plate, and may be made of another material such as a metal plate.

In addition, the present invention can be modified in various ways such as changing the shape of the mirror over 15 as appropriate.

[Effects of the Invention] As is apparent from the above description, the present invention is to mount an ultrasonic vibrator on the diaphragm and to fix the outer peripheral portion of both the diaphragm and the mirror glass by overlapping them. In a state where a predetermined gap is formed between the two by joining them, the outer peripheral edge of the diaphragm is projected from the outer peripheral edge of the mirror glass, and the outer peripheral edge of the diaphragm is used as a mirror holder. Because it was a configuration that was supported,
The mirror holder can be prevented from hindering the vibration of the mirror glass, the mirror glass can be efficiently vibrated, and the moisture removal performance can be effectively exhibited.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 1 is an enlarged cross-sectional view of the main part, and FIG. 2 is an overall cross-sectional view. And, FIG. 3 shows a first comparative example of the present invention.
It is a figure equivalent figure. In the drawing, 11 is a mirror glass, 12 is a diaphragm, 13 is an adhesive,
Reference numeral 14 is an ultrasonic transducer, 15 is a mirror holder, and 16 is a fitting groove.

Continuation of the front page (56) References JP 62-150201 (JP, A) actual opening 61-30552 (JP, U) actual opening 62-29949 (JP, U) actual opening 61-152540 (JP , U)

Claims (1)

[Scope of utility model registration request] 1. An ultrasonic transducer is attached to a diaphragm,
The vibration plate and the mirror glass are superposed on each other so as to be fixed to each other so that a predetermined gap is formed between the vibration plate and the mirror glass, and the two are bonded to each other to vibrate the vibration of the ultrasonic vibrator. In a structure in which water droplets on the surface of the mirror glass are atomized and removed by being transmitted to the mirror glass through a plate, the outer peripheral edge portion of the diaphragm protrudes from the outer peripheral edge portion of the mirror glass. A mirror with a water drop removing function, characterized in that the outer peripheral edge of the diaphragm is supported by a mirror holder.