JP2727633B2 - Electric sliding sun visor device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an interior member formed by a driving force of an ultrasonic motor in a hollow portion formed between an interior member mounted on a vehicle interior side of a roof and a loop panel. The present invention relates to an electric slide type sun visor device which houses a sun visor which can be protruded and retracted in a direction of a front wind panel from an opening formed in front of the sun visor.

2. Description of the Related Art In general, a sun visor for blocking direct sunlight from a front wind panel is provided on a loop side located above a driver's seat or a passenger's seat of a car, but a normal sun visor is provided with a hinge mechanism. It is equipped with a variable mounting angle on the roof side, and when not in use, it is folded down to the roof side by the above hinge mechanism, and it is normal for it to hang down on the front side of the front wind panel only when used. is there.

On the other hand, for example, JP-B-45-31016 and JP-B-45-31017 disclose an electric sliding sun visor in a hollow portion formed between an interior member mounted on the interior side of a roof and a roof panel. Is stored, and when the sun visor is used, the sun visor is slid in the direction of the front wind panel from the opening formed in front of the interior member by the rotational force of the motor. As a driving source of the sun visor, in addition to a means for extracting a driving force obtained from a normal electric motor through a speed reduction mechanism, a means using a light and small ultrasonic motor is also conceivable. In particular, it is effective to use an ultrasonic motor in consideration of the fact that the electric slide mechanism must be stored in a narrow hollow portion.

According to such a configuration of the sun visor, since the sun visor is concealed on the roof side by the interior member when not in use, there is an advantage that the interior of the vehicle is widened and the appearance is improved.

However, in the case of such an electric sliding sun visor which is conventionally used, not only the sliding operation of the sun visor by electric power but also the storing of the sun visor due to the failure of the electric system during the use of the sun visor, etc. When it is no longer possible to operate the sun visor by manual operation by the occupant, it may be necessary to use the electric motor as a drive source. Further, when the sun visor is forcibly stored, there is a problem that the sun visor or the electric slide mechanism may be damaged due to the manual operation, and the durability of the entire apparatus is deteriorated.

Further, even when an ultrasonic motor is used as a driving source, the ultrasonic motor has a large stationary holding torque when stopped because the rotor is pressurized by a spring or the like on the vibrator, Even if the occupant attempts to manually operate the sun visor, the visor cannot be easily moved. Therefore, it is difficult to manually move the sun visor, and there is a problem in view of securing the occupant's view.

Therefore, the present invention solves the problem of such an electric sliding sun visor, particularly a sun visor using an ultrasonic motor as a driving source, and manually operates the sun visor even when the driving of the ultrasonic motor is stopped. It is an object of the present invention to provide an electric sliding sun visor device that can easily perform movement and fine adjustment.

Means for Solving the Problems In order to achieve the above object, the present invention provides a motor in which a sun visor is stored in a hollow portion formed between an interior member mounted on the interior side of a roof and a roof panel and a roof panel. In the electric slide type sun visor device in which the sun visor is protruded and retracted in the direction of a front wind panel formed in front of the interior member by the driving force, the motor includes a polarized piezoelectric or electrostrictive vibrator, An ultrasonic motor having a pair of drive electrodes for applying a frequency voltage to the transducer and a rotor pressurized on a vibrator, wherein the ultrasonic motor is configured to slide the sun visor when the pair of drive electrodes To the vibrator to generate an oscillating traveling wave, and when the sun visor is stopped, the pair of drive electrodes An electric sliding sun visor device in which a frequency voltage is applied to only one of the driving electrodes or a frequency voltage having the same phase is applied to both of the driving electrodes so as to induce a vibrating standing wave in the vibrator. Configuration.

According to such a configuration, when the sun visor slides, by applying frequency voltages having phases different from each other to the pair of drive electrodes, an oscillating traveling wave is induced in the piezoelectric vibrator or the electrostrictive vibrator. The rotor is driven by the oscillating traveling wave, and the sun visor moves in the front-back direction.

On the other hand, when the sun visor is stopped, a frequency voltage is applied to only one of the pair of drive electrodes,
Alternatively, by applying a frequency voltage having the same phase to both drive electrodes, an oscillating standing wave is induced in the voltage oscillator or the electrostrictive oscillator, and the stationary holding torque of the rotor is reduced by the oscillating standing wave. , The sun visor can be easily operated manually.

An embodiment of an electric sliding sun visor device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing an example of an electric sliding sun visor to which the present invention is applied. In FIG. 1, 1 is a roof outer panel, 3 is a roof inner panel, and a roof panel 4 is formed by both panels 1, 3. doing. Both panels 1,
The three flange portions 1a, 3a are fitted and fixed in the engagement groove 5a on one side of the window ether strip 5, and the upper end of the front window panel 7 is fitted in the engagement groove 5b on the other side of the window ether strip 5. 7a is fitted and fixed.

Reference numeral 9 denotes an interior member lined on the interior side of the roof of the vehicle. A hollow portion 10 is formed between the interior member 9 and the roof panel 4, and an electric slide mechanism of a sun visor described later is formed in the hollow portion 10. In the vicinity of the front end of the interior member 9, an opening 9a for allowing the sun visor body to protrude and retract is formed.

A configuration example of the electric slide mechanism 20 will be described. That is, a guide member 12 of a sun visor is provided in the hollow portion 10, and a sun visor body 13 is stored in a groove 12 a formed in the guide member 12 so as to be slidable in the front-rear direction. Further, an ultrasonic motor 15 is provided above the roof inner panel 3.
The output shaft 15a of the ultrasonic motor 15 passes through the roof inner panel 3 and the sun visor body 13
The sun visor body 13 is made to slide.

That is, as shown in FIG. 2, a pinion gear 17 is fixed to the distal end of the output shaft 15a of the ultrasonic motor 15, while a long groove 19 extending in the front-rear direction is formed substantially at the center of the sun visor body 13. A rack 21 that can be engaged with the pinion gear 17 is formed on the inner wall surface of the long groove 19 in the front-rear direction. Therefore, the rotational force obtained by the ultrasonic motor 15 is transmitted to the sun visor body 13 by the output shaft 15a, and the sun visor body 13 can be slid in the front-rear direction.

As an example of the above-described ultrasonic motor 15, as shown in FIG. 3, for example, a piezoelectric vibrator or an electrostrictive vibrator having an annular shape.
25 (hereinafter simply referred to as the vibrator 25), a rotor 26 similarly formed in an annular shape is closely contacted in a parallel state, and the vibrator is driven by using a driving voltage of a predetermined frequency obtained from a driving power supply. By exciting the oscillator 25, an oscillator traveling wave a shown in the figure is induced in the oscillator 25, and the rotor 26 starts rotating in the direction indicated by B by the oscillatory traveling wave a.
The rotational force of the rotor 26 is transmitted to the pinion gear 17 via the output shaft 15a, and the sun visor body 13 can be slid (for the rotary ultrasonic motor described above, Morikita Publishing, July 1, 1986). (See “Piezoelectric / Electrostrictive Actuator” published by Kenji Uchino, published by the Japanese government).

The vibrator 25 includes a pair of drive electrodes shown in FIG.
D ₁ and D ₂ , a monitor electrode D ₃ and a common electrode D ₄ are arranged. The drive electrodes D ₁ and D ₂ are connected to the polarized oscillator 25.
An electrode for applying a frequency voltage to each other 90 ° different phases on the piezoelectric or electrostrictive element of each group, monitor electrode D ₃ is the drive electrodes D _1, D ₂ and electrically insulated by the An electrode for detecting the vibration state of the vibrator 25.

Next, an example of a drive circuit for the electrodes D ₁ , D ₂ , and D ₃ attached to the vibrator 25 will be described with reference to FIG.

In the figure, 31 is a band-pass filter, the band-pass filter 31 extracts a predetermined frequency doubled or subharmonic against resonant frequency of the ultrasonic motor 15 in the output obtained from the monitor electrode D ₃ . A rectifier 33 rectifies the output voltage of the band-pass filter 31 and converts it into a DC voltage. 35 is an A / D converter, 37 is a CPU, and the rectifier 3
After the DC voltage output from 3 is converted into a digital signal by the A / D converter 35, it is read into the CPU 37, and the CPU 37 determines the drive frequency of the ultrasonic motor 15 according to this value, Input to the / A converter 39.

Reference numeral 41 denotes a voltage controlled oscillator that oscillates a pulse having an oscillation frequency according to the output value of the D / A converter 39. Note that the oscillation frequency of the electrode control oscillator 41 depends on the ultrasonic motor 15
About 32 times the resonance frequency of

Reference numeral 43 denotes a frequency divider, which divides the output pulse of the voltage controlled oscillator 41 by 32, and outputs the divided pulse to an amplifier 45 and a coil 47.
Applied to the drive electrodes D ₁ through.

On the other hand, reference numeral 49 denotes a shift register, which receives the output of the voltage controlled oscillator 41 as a clock signal and has a function of shifting the phase of the output pulse of the frequency divider 43 by 90 °. That is, the shift register 49 has a function of delaying the output pulse of the frequency divider 43 by 90 ° or advancing it by 90 ° in order to rotate the ultrasonic motor 15 forward or backward based on a command from the CPU 37. ing.

51 is a selection switch, an output pulse of the shift register 49 is supplied to the amplifier 53 via the selection switch 51 is applied to the drive electrodes D ₂ further through the coil 55.

The above selection switch 51 includes a terminal S ₁ is grounded, the terminal S ₂ to be connected to the shift register 49, and a switch piece S ₃ which is connected to the amplifier 53.

The operation of the driving circuit of the electric sliding sun visor having such a configuration will be described below.

First, when the sun visor body 13 is made to protrude and retract from the opening 9a provided near the front end of the interior member 9, a selection switch is provided.
The switch piece S ₃ 51 advance to defeat the terminal S ₂ side, turning on the power switch outside the figure, first, the ultrasonic motor 1 from CPU37
The upper limit of the drive frequency of 5 is indicated. Since this driving frequency is significantly higher than the resonance frequency of the ultrasonic motor 15, the ultrasonic motor 15 does not rotate. Therefore, the CPU 37 instructs the drive frequency to decrease by 0.1 KHz, and accordingly, the frequency data designated by the CPU 37 is transmitted to the voltage controlled oscillator 41 by the D.
A value obtained by reducing the value obtained by the / A conversion by 0.1 KHz is input, so that the oscillation frequency is reduced by 3.2 KHz. This voltage controlled oscillator
The output pulse of 41 is divided by 32 by the divider 43,
As the state output pulse obtained with applied to the drive electrodes D ₁ through the amplifier 45 and the coil 47, the output of the frequency dividing circuit 43 is phase 90 DEG is a shift register 49 from selector switch 51, amplifier 53 and through the coil 55 is applied to the drive electrodes D _2. At this time, since the ultrasonic motor 15 has not yet been rotated, the output value of the band-pass filter 31 is zero, so the CPU 37 continues to instruct to reduce the drive frequency by 0.1 KHz, and the drive frequency Motor 15
When the resonance frequency reaches the above, the rotation of the motor is started.
As the drive frequency approaches the optimum value, the rotation speed and torque of the ultrasonic motor 15 gradually increase, and when the drive frequency drops below the optimum drive frequency, the monitor electrode D ₃ is connected to the transducer 25.
And extracts only a component that is an integral multiple or a fraction of the resonance frequency of
The driving frequency is lowered so that the output of the band-pass filter 31 does not exceed a predetermined value.

The voltage having the driving frequency thus obtained is applied to the driving electrodes D ₁ and D ₂ , causing the vibrator 25 to generate the vibrating traveling wave a shown in FIG. The traveling wave a can rotate the rotor 26 in the direction indicated by B.

Next, the operation of the sun visor body 13 when stopping the hammering operation will be described below.

That is, when the sun visor body 13 is stopped from the driving state, by switching the switch piece S ₃ of the selection switch 51 to the terminal S ₁ on the ground side, the driving voltage to the driving electrode D ₂ is not applied, and the driving is stopped. so that the driving voltage only to electrodes D ₁ is applied. Accordingly, the rotation of the ultrasonic motor 15 itself is stopped, and the sun visor body 13 is held at the position at the moment when the selection switch 51 is switched to the ground side.

At this time, as shown in FIG. 6, an oscillatory standing wave b is induced in the oscillator 25 instead of the oscillatory traveling wave a,
The rotor 26 does not rotate. In other words, focusing on one point of the rotor 26, the rotor 26 performs an operation of repeating the vertical movement with respect to the vibrator 25. Therefore, the rotor 26 is instantaneously floated on the surface of the vibrator 25 and is present on the vibrator 25 with a weak holding force, so that the stationary holding torque between the vibrator 25 and the rotor 26 is , 30 compared to when the power is turned off
It is about 1/10 smaller.

Under these conditions, when the occupant attempts to manually operate the sun visor body 13, the ultrasonic motor
Since the stationary holding torque of the rotor 26 with respect to the vibrator 25 inside the rotor 15, that is, the frictional force is extremely small, the sun visor main body 13 can be easily moved. Can be implemented.

Incidentally, application in the above-mentioned embodiment was applied frequency voltage only to the driving electrodes D ₁ when stopping the sun visor body 13 but, instead of this, both the drive electrodes D _1, at the same time equal frequency voltage of phase D ₂ The same operation and effect can be obtained.

Effects of the Invention As described in detail above, according to the electric slide type sun visor device of the present invention, the following operations and effects are provided. That is, when the sun visor slides, by applying frequency voltages having mutually different phases to the pair of drive electrodes, an oscillating traveling wave is induced in the piezoelectric vibrator or the electrostrictive vibrator, and the rotor is driven, and the sun visor is driven. While it can move in the front-back direction, when the sun visor is stopped, a frequency voltage is applied to only one of the pair of drive electrodes, or a frequency voltage having the same phase is applied to both drive electrodes. As a result, an oscillating standing wave is induced in the piezoelectric vibrator or the electrostrictive vibrator, and the stationary holding torque of the rotor can be reduced by the oscillating standing wave. Therefore, in this state, it is possible to easily operate the sun visor manually, and it is possible to secure the occupant's field of view when the sun visor stops sliding, thereby enhancing safety.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of an electric sliding sun visor to which the present invention is applied, FIG. 2 is a perspective view of the main part of the same, FIG. 3 is a schematic view showing the operation principle of an ultrasonic motor, and FIG. FIG. 5 is a drive circuit diagram of the ultrasonic motor, and FIG. 6 is a schematic diagram showing the operation when the ultrasonic motor is stopped. DESCRIPTION OF SYMBOLS 1 ... Roof outer panel, 3 ... Roof inner panel, 4 ... Roof panel, 5 ... Window ether strip, 7 ... Front wind panel, 9 ... Interior member, 9a ... Opening, 10 ... Hollow , 12 ... guide member, 13 ... sun visor body, 15 ... ultrasonic motor, 20 ... electric slide mechanism, 25 ... vibrator, 26 ... rotor, 31 ... band-pass filter, 33 ... rectifier, 35 …… A / D converter, 37 …… CPU, 39 …… D / A converter, 41 …… Voltage controlled oscillator, 43 …… Divider, 45,53 …… Amplifier, 49 …… Shift register, 51 …… Selection switch,

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Satoshi Ichikawa 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (56) References JP-A-63-206170 (JP, A) JP-A-63- 110977 (JP, A) JP-A-62-189980 (JP, A) JP-A-60-188629 (JP, U)

Claims (1)

(57) [Claims] A sun visor is housed in a hollow portion formed between an interior member mounted on the interior side of a roof and a roof panel, and the sun visor is formed in front of the interior member by a driving force of a motor. In the electric sliding sun visor device which is made to protrude and retract in the direction of the front wind panel from the opened opening, the motor comprises: a polarized piezoelectric or electrostrictive vibrator; and a pair of vibrators for applying a frequency voltage to the vibrator. An ultrasonic motor having a driving electrode and a rotor pressed against a vibrator, wherein the ultrasonic motor applies frequency voltages having phases different from each other to the pair of driving electrodes when the sun visor is slid. To cause the vibrator to generate an oscillating traveling wave, and when the sun visor is stopped, only one of the pair of drive electrodes is driven by a frequency voltage. Applying a either or both of the driving electrode by applying an equal-frequency voltage of the phase, the electric sliding sun visor apparatus characterized by raising the oscillatory standing wave in said vibrator.