JPH06141961A - Mist prevented mirror - Google Patents

Abstract

PURPOSE:To suppress degradation of an apparatus and maintain its mist preventive/removing function for a long period by turning on a switch only under the easy-to-mist situation, and transmitting to a mirror the vibration of a vibration generating part which vibrates with electric signal, CONSTITUTION:When a switch 12 is turned on, an oscillator circuit part 14 transmits an electric signal of a specific frequency to a vibration generating part 13. Because of its structure with voltage drive, the power consumption is less, and it is possible to construct the power supply part 15 in a small size. In the vibration generating part 13, electric signal of specific frequency is given from the oscillator circuit 14 to electrodes 18a, 18b, an oscillator 17 receives the electric signal and vibrates at the same frequency. The surface with the electrode 18b adheres is in tight attachment to the rear surface of a mirror 10, and vibration of the oscillator 17 is in the form of elastic wave transmitted to the inside of the mirror 10 to cause vibration of its surface, and ultra-small water drops on the surface are splashed away. This allows removing mist from the mirror surface, or prevents the mirror from misting. There is no need to keep the switch 12 on at all times, degradation of the apparatus is suppressed, and its mist preventive function can be maintained for a long period.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-fog mirror having a function of transmitting the vibration of a vibration generator vibrated by an electric signal to a mirror to prevent fog on the mirror surface.

[0002]

2. Description of the Related Art When a mirror is used for bathing, face washing, makeup, shaving, etc., the surface of the installed mirror may be fogged by water vapor. To prevent or remove the fog on the mirror surface, the conventional method is to wipe off the fog on the mirror surface with a dry cloth.
Alternatively, it has been a general method to coat the mirror surface with a coating film in advance by using a chemical agent or the like to prevent water vapor from adhering to the mirror surface.

[0003]

However, when the method is used, such as when taking a bath or using hot water, even if the fog is wiped off with a dry cloth, the fog is immediately lost at the same time, and the effect is not sustained at all. Also, the method of coating the mirror surface with a coating film has a short service life of the coating film itself, so that there is a problem in the persistence of the effect although it has an antifogging effect at the beginning of coating.

As described above, there is no method for removing the fog on the mirror and maintaining the effect even after the removal, which is inconvenient for those using the mirror. Therefore, an object of the present invention is to provide an anti-fog mirror that can maintain the anti-fog effect for a long period of time.

[0005]

In order to achieve such an object, the present invention provides the following anti-fog mirror. That is, the anti-fog mirror is configured so that a vibration generating unit is provided in close contact with the back surface of the mirror, an oscillation circuit unit that generates an electric signal for vibrating the vibration generating unit, and a power supply unit are provided. Of.

[0006]

[Operation] When the anti-fog mirror according to the present invention is turned on in a situation where the mirror is easily fogged, electricity is supplied from the power supply unit to the oscillation circuit unit, and a periodic electric signal is output from the oscillation circuit unit. It is sent to the vibration generator. The vibration generator is a device that converts a periodic electrical signal into vibration.The electrical signal sent from the oscillation circuit causes the vibration generator to vibrate, and the vibration propagates inside the mirror as an elastic wave and vibrates the surface of the mirror. By doing so, it is possible to prevent the formation of extremely small water drops, that is, fogging, on the mirror surface. If the switch is turned on while the mirror is already fogged, the fog adhering to the mirror surface is removed, and the fog does not adhere to the mirror surface while the switch is on.

[0007]

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

(1) Determining the Optimum Frequency of Elastic Wave for Defrosting The present invention propagates an elastic wave in the mirror to vibrate the mirror surface
This is to instantly atomize and scatter the smallest water droplets (clouds) on the mirror surface. The frequency of the elastic wave is the same as the frequency of the electric signal oscillated by the oscillator circuit part, and the frequency is determined by the circuit configuration of the oscillator circuit part. Therefore, in order to atomize the water droplets on the mirror surface most effectively, any frequency The circuit of the oscillation circuit unit cannot be determined unless it is clear whether the elastic wave is used. Therefore, the optimum frequency of the elastic wave for removing the fog will be described below.

Generally, the optimum frequency (f) for removing fog is expressed by the following equation. f = K {T / (ρd ³ )} ^1/2 K: Proportional constant T: Surface tension ρ: Density d: Droplet size Note that in the case of water, the optimum frequency (f) is generally 30 MHz to 1000 MHz. Is said.

However, it is difficult to theoretically determine the optimum frequency (f) because it depends on the material and surface shape of the substance surface to which the water droplets adhere, and the ambient temperature and humidity in addition to the above parameters. Further, the effect of removing fogging is influenced not only by the frequency of the elastic wave but also by the magnitude of its vibration, and the greater the vibration, the greater the effect of removing fogging. Therefore, when resonating at a frequency equal to the natural frequency of the mirror, a large vibration occurs with a power that is not so large. However, even if it resonates, if the frequency is outside the range of the frequency that atomizes the water droplets, the cloud cannot be removed. Therefore, in this embodiment, it is 2 to 20 in advance.
The optimum frequency (f) is determined by conducting an experiment to remove the fog by changing the frequency within the range of megahertz.

(2) Structure of this Embodiment FIG. 1 is a perspective view of this embodiment as seen from the surface direction of the mirror.
In FIG. 1, 10 is a mirror, 11 is a mirror case, and 12 is a switch for operating a power supply. 2 is a sectional view taken along line AA of FIG.

Reference numeral 13 in FIG. 2 denotes a vibration generating portion, which is adhered to the back surface of the mirror 10 with an adhesive. Vibration generator 13
Generates vibration by an electric signal transmitted from an oscillating circuit section 14 described later, and sends an elastic wave to the mirror 10. The frequency of this elastic wave is 2 to 20 MHz, which is so-called ultrasonic wave.

Reference numeral 14 denotes an oscillation circuit section, which is a vibration generating section 13
Generates an electric signal for vibrating the oscillator. The oscillator circuit unit 14 is composed of, for example, a Hartley push-pull circuit. The oscillating circuit section 14 is configured to oscillate at the optimum frequency described above, and is integrated into an integrated circuit.

Reference numeral 15 is a power supply unit. In this embodiment, the voltage drive is used, so that the power consumption is small and the power supply unit can be downsized. Since the vibration generating unit 13 and the oscillation circuit unit 14 can also be downsized, the storage space for 13 to 15 provided on the back of the mirror can be reduced. It can also be attached to a relatively small mirror.

Reference numeral 16 denotes an adhesive for closely fixing the vibration generating portion 13 to the back surface of the mirror 10.

Reference numerals 19a and 19b are lead wires connecting the vibration generating section 13 and the oscillation circuit section 14. In the present embodiment, two lead wires are taken out from one side of the vibration generating part 13, but one wire may be taken out from both sides.

(3) Configuration of Vibration Generating Section FIG. 3 is an enlarged perspective view of the vibration generating section 13. Further, FIG. 4 shows a sectional view taken along line BB of FIG. The vibration generator 13 is composed of a vibrator 17 and electrodes 18a and 18b coated on both surfaces thereof.

Reference numeral 17 denotes a vibrator (ultrasonic wave generating element) composed of a piezoelectric element or a crystal vibrator. The vibrator 17 vibrates at the frequency by the high frequency electric signal transmitted from the oscillation circuit unit 14 to the electrodes 18a and 18b.

Reference numerals 18a and 18b denote silver or silver para electrodes applied on both sides of the vibrator 17. Electrodes 18a, 18
b transmits a high frequency electric signal transmitted from the oscillation circuit section 14 to the vibrator 17.

(4) Operation of the present embodiment When the switch 12 is turned on, the oscillation circuit section 14 sends an electric signal of a specific frequency to the vibration generating section 13.

In the vibration generator 13, when an electric signal having a specific frequency is transmitted from the oscillator circuit 14 to the electrodes 18a and 18b, the vibrator 17 receives the electric signal and vibrates at the same specific frequency.

As shown in FIG. 2, the surface on which the electrode 18b is attached is in close contact with the back surface of the mirror 10, and the vibration of the vibrator 17 propagates inside the mirror 10 as an elastic wave to vibrate the mirror surface, Repels the smallest water droplets on the surface. Therefore, it is possible to remove the fogging on the mirror surface and prevent the fogging of the mirror.

[0023]

By using the anti-fog mirror according to the present invention, it is possible to prevent or remove the fogging of the mirror by turning on the switch. In addition, it is not necessary to turn on the switch all the time, and it is sufficient to turn on the switch only under conditions where it is easy to fog and turn off the other switches, so deterioration of equipment can be suppressed and its fogging prevention / removal function can be maintained for a long time. .

[Brief description of drawings]

FIG. 1 is a perspective view of the present embodiment as seen from the surface direction of a mirror.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged perspective view of a vibration generator 13.

FIG. 4 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Mirror 11 Mirror case 12 Switch 13 Vibration generation part 14 Oscillation circuit part 15 Power supply part 16 Adhesive 17 Vibrator of vibration generation part 13 18a / 18b Electrodes 19a / 19b of vibration generation part 13 Vibration generation part 13 and oscillation circuit part 14 Lead wire connecting to

Claims (1)

[Claims] An anti-fog mirror characterized in that a vibration generating section is provided in close contact with the back surface of the mirror, an oscillation circuit section for generating an electric signal for vibrating the vibration generating section, and a power supply section are provided.