JP5056572B2 - Wiper device - Google Patents

Description

  The present invention relates to a wiper device in which a blade rubber that reciprocates on the surface of a wiping object wipes off water droplets and the like attached to the wiping object, and is suitable for use in a windshield wiper device of a vehicle.

  Conventionally, Patent Document 1 is disclosed as this type of wiper device. In this prior art, an auxiliary blade or roller is attached to the wiper blade, and when the wiper is reversed, the wiper blade moves in the reverse direction. The pressure contact force of the blade (more specifically, blade rubber) is reduced.

Thereby, it is suppressed that the wiper blade gives an impact force to the glass when the wiper is reversed and an unpleasant impact sound (reversal sound) is generated.
Japanese Patent Laid-Open No. 8-301074

  However, in the above-described prior art, since the auxiliary blade or the roller is attached to the wiper blade, there is a problem that the configuration is complicated and the cost is increased and the physique is increased.

  In view of the above points, an object of the present invention is to simplify the configuration and reduce the size of the physique.

In order to achieve the above object, according to the first aspect of the present invention, the first wiper blade (10) and the second wiper blade (11) disposed on the surface of the wiping object (1),
A drive device (12) for reciprocating the first and second wiper blades (10, 11) on the surface of the wiping object (1);
When the moving direction of the first wiper blade (10) is reversed, the vibration of the wiping object excited by the impact force applied to the wiping object (1) by the first wiper blade (10) is defined as the first vibration. The vibration of the wiping object (1) excited by the impact force applied to the wiping object (1) by the second wiper blade (11) when the moving direction of the two wiper blades (11) is reversed is referred to as the second vibration. When
Means for shifting the inversion timing of the first wiper blade (10) and the inversion timing of the second wiper blade (11) by a predetermined time so that the first vibration and the second vibration are canceled in the vibration mode at a predetermined frequency. 14, 15) is provided in the drive device (12).

  According to this, it is possible to attenuate the vibration of the wiping object (1) caused by the reversal of the first and second wiper blades (10, 11) in a short time, thereby reducing the magnitude of the reversal sound felt by humans. . For this reason, compared with what attached an auxiliary blade or a roller to a wiper blade as a countermeasure against inversion sound like the above-mentioned prior art, a simplification of a structure and size reduction can be achieved.

Further, in the invention according to claim 1, when the Jo Tokoro time was Delta] t, the oscillation period of the oscillation mode at a given frequency is T,
(1/4 + n) T ≦ Δt ≦ (3/4 + n) T is satisfied.

  However, n is a predetermined natural number.

  According to this, since the first vibration and the second vibration can be effectively canceled, the vibration of the wiping object (1) can be attenuated in a shorter time.

In the invention according to claim 2 , in the wiper device according to claim 1, when the predetermined time is Δt and the vibration period of the vibration mode at the predetermined frequency is T,
It is characterized in that the relationship Δt = (1/2 + n) T is satisfied.

  However, n is a predetermined natural number.

  According to this, since the first vibration and the second vibration can be canceled out more effectively, the vibration of the wiping object (1) can be attenuated in a shorter time.

As in the third aspect of the invention, in the wiper device of the first or second aspect , if the predetermined natural number n is set to 1, the first vibration and the second vibration are more effective. Therefore, the vibration of the wiping object (1) can be further attenuated in a short time.

According to a fourth aspect of the present invention, in the wiper device according to any one of the first to third aspects, the means (14, 15) includes the first and second wiper blades (10, 11). A wiper blade having a larger vibration mode amplitude at a predetermined frequency is reversed first, and a wiper blade having a smaller vibration mode amplitude at a predetermined frequency is reversed after a predetermined time. Thereby, the vibration of the wiping object (1) can be attenuated in a shorter time.

As in the fifth aspect of the invention, in the wiper device according to any one of the first to fourth aspects, if the predetermined frequency is set to 250 Hz or less, an inverted sound having a frequency of 250 Hz or less that is uncomfortable for humans is generated. Can be reduced.

As in the sixth aspect of the invention, in the wiper device according to any one of the first to fifth aspects, if the predetermined frequency is 20 Hz or higher, the frequency of a frequency of 20 Hz or higher, which is a human audible range, is obtained. Inverted sound can be reduced.

According to a seventh aspect of the present invention, in the wiper device according to any one of the first to sixth aspects, the moving direction of the first and second wiper blades (10, 11) is reversed from the forward direction to the backward direction. The means (14, 15) detects the reversal timing of the first wiper blade (10) and the second wiper blade only during one reversal of the first reversal and the second reversal that reverses from the backward direction to the forward direction. The inversion timing of (11) is shifted by a predetermined time.

  According to this, the vibration of the wiping object (1) due to the reversal of the first and second wiper blades (10, 11) is caused in a short time at the time of one reversal during the first reversal and the second reversal. It is possible to reduce the magnitude of the inverted sound that humans feel by attenuating.

In the invention according to claim 8 , in the wiper device according to any one of claims 1 to 6 , the moving direction of the first and second wiper blades (10, 11) is reversed from the forward direction to the backward direction. During both the first reversal and the second reversal when reversing from the backward direction to the forward direction, the means (14, 15) performs the reversal timing of the first wiper blade (10) and the second wiper blade (11 ) Inversion timing is shifted by a predetermined time.

  According to this, the vibration of the wiping object (1) due to the reversal of the first and second wiper blades (10, 11) is attenuated in a short time during both the first reversal and the second reversal. By doing so, it is possible to reduce the volume of the inverted sound that humans feel.

As in the ninth aspect of the invention, in the wiper device according to the eighth aspect of the invention, if the predetermined time is individually set for the first inversion and the second inversion, the first inversion and the second inversion At the time of both inversions, the vibration of the wiping object (1) can be effectively attenuated to effectively reduce the magnitude of the inversion sound felt by humans.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In this embodiment, the wiper device according to the present invention is applied to a windshield wiper device for a vehicle. FIG. 1 is an overall configuration diagram showing an outline of a wiper device in the present embodiment. In the figure, the up, down, left and right arrows indicate the up, down, left and right directions of the vehicle.

  The wiper device reciprocates the first and second wiper blades 10 and 11 and the first and second wiper blades 10 and 11 disposed on the surface of the windshield, which is the object to be wiped, on the surface of the windshield. It is roughly divided into the driving device 12.

  In this example, the first wiper blade 10 is disposed on the left side of the vehicle and the second wiper blade 11 is disposed on the right side of the vehicle. Although not shown, each of the first and second wiper blades 10 and 11 has blade rubber that slides on the windshield.

  The drive device 12 includes a wiper motor 13, a motor control device 14 that drives the wiper motor 13, and a connection mechanism 15 that connects the wiper motor 13 and the first and second wiper blades 10 and 11.

  The wiper motor 13 is disposed in the engine room of the vehicle, and a DC motor is used in this example. The motor control device 14 applies a predetermined applied voltage to the wiper motor 13 according to the operation of a wiper switch (not shown) by the occupant, thereby switching the operation and stop of the wiper motor 13 and the operation of the wiper motor 13. Switch between speeds.

  The coupling mechanism 15 includes a crank arm 16 coupled to an output shaft (not shown) of the wiper motor 13, first and second link rods 17 and 18 coupled to the crank arm 16, and first and second link rods. First and second wiper arms 19 and 20 for connecting the first and second wiper blades 10 and 11 to the first and second wiper blades 10 and 11 are provided.

  The crank arm 16 is connected to the output shaft of the wiper motor 13 via a worm gear (not shown). The first link rod 17 extends from the crank arm 16 toward the first wiper blade 10 side, and the second link rod 18 extends from the crank arm 16 toward the second wiper blade 11 side.

  The first wiper arm 19 is connected to the first link rod 17 and is supported rotatably about a pivot shaft 19a. The second wiper arm 20 is connected to the second link rod 18 and supported rotatably about the pivot shaft 20a.

  The first wiper blade 10 is attached to the first wiper arm 19, and the second wiper blade 11 is attached to the second wiper arm 20.

  When the wiper motor 13 is driven, the first and second link rods 17 and 18 connected to the crank arm 16 perform piston movement, and the first and second wiper arms 19 and 20 are centered on the pivot shafts 19a and 20a, respectively. Operates like a fan.

  As a result, the first and second wiper blades 10 and 11 reciprocate on the surface of the windshield, and the blade rubber of the first and second wiper blades 10 and 11 wipes raindrops and the like attached to the surface of the windshield. To do.

  Here, the reversal of the moving direction of the first and second wiper blades 10 and 11 from the upward direction (forward direction) in FIG. 1 to the downward direction (reverse direction) in FIG. 1 is referred to as upward reversal (first reversal). The reversal of the moving direction of the first and second wiper blades from the downward direction (reverse direction) in FIG. 1 to the upward direction (forward direction) in FIG. 1 is referred to as downward reversal (second reversal).

  In FIG. 1, the solid line position of the first wiper blade 10 indicates the lower reverse position of the first wiper blade 10, and the two-dot chain line position of the first wiper blade 10 indicates the upper reverse position of the first wiper blade 10. The first wiper blade 10 is inverted downward near the lower end portion of the windshield, and is inverted upward near the central portion of the windshield in the left-right direction.

  In FIG. 1, the solid line position of the second wiper blade 11 indicates the lower reverse position of the second wiper blade 11, and the two-dot chain line position of the second wiper blade 11 indicates the second wiper blade when the first wiper blade 10 is reversed upward 11, and the broken line position of the second wiper blade 11 indicates the upper reversal position of the second wiper blade 11.

  The second wiper blade 11 is turned upside down near the right end of the windshield. Further, the second wiper blades 10 and 11 are inverted downward in the vicinity of the lower end portion of the windshield.

  As shown in the two-dot chain line position and the broken line position of the second wiper blade 11 in FIG. 1, the upper inversion timing of the first and second wiper blades 10 and 11 is shifted by a predetermined time Δt. Specifically, the first wiper blade 10 is turned up first, and the second wiper blade 11 is turned up after a predetermined time Δt.

  In this example, the upper reversal timing of the first and second wiper blades 10 and 11 is shifted by a predetermined time Δt depending on the configuration of the coupling mechanism 15. In other words, the coupling mechanism 15 constitutes means for shifting the upper reversal timing of the first and second wiper blades 10 and 11 by a predetermined time Δt.

  Although details will be described later, in this example, the time difference (predetermined time) Δt of the upper inversion timing is set to 10 ms. In this example, the lower inversion timings of the first and second wiper blades 10 and 11 are the same.

  Next, the effect by the said structure is demonstrated. First, the mechanism of generating and recognizing the reversing sound when the wiper is reversed will be explained. When the wiper is reversed, the wiper blade (more specifically, the blade rubber) is reversed, giving an impact force to the windshield as the object to be wiped. The impact force causes the windshield to vibrate, generating a sound that is recognized by people as an inverted sound.

  When the wiper blade applies an impact force to the windshield, the vibration mode of the windshield is excited, so that the sound generated near its natural frequency is increased. Moreover, the vibration mode to be excited differs depending on the part where the wiper blade strikes the windshield.

  And in a wiper device provided with a plurality of wiper blades like this embodiment, there are a plurality of striking parts (striking points) where a wiper blade gives impact force to a windshield. In the present embodiment, two points on the windshield are hit by the first and second wiper blades 10 and 11 when the wiper is reversed.

  Here, the vibration mode of the windshield 1 excited by the upper reversal of the first and second wiper blades 10 and 11 is referred to as an upper reversal vibration mode, and is excited by the lower reversal of the first and second wiper blades 10 and 11. The vibration mode of the windshield 1 is referred to as a lower inversion vibration mode.

  As a comparative example, consider a wiper device in which the upper reversal timings of the first and second wiper blades 10 and 11 coincide. FIG. 2 is an explanatory diagram for explaining the upper inversion vibration mode in this comparative example.

  In this comparative example, since the upper inversion sound becomes loud at a frequency of 50 Hz, FIG. 2A shows the upper inversion vibration mode at a frequency of 50 Hz. FIG. 2B is a cross-sectional view of the upper inversion vibration mode in FIG.

  As can be seen from FIG. 2A, in the upper inversion vibration mode at a frequency of 50 Hz, both end portions in the left-right direction of the windshield 1 become nodes of vibration, and the center portion in the left-right direction of the windshield 1 is a vibration antinode. It has become.

  As can be seen from FIG. 2B, the upper inversion vibration mode at a frequency of 50 Hz is the vibration position (striking point) L1 by the first wiper blade 10 and the vibration position (striking point) R1 by the second wiper blade 11. The amplitude of the first wiper blade 10 at the excitation position L1 is larger than the amplitude of the second wiper blade 11 at the excitation position R1.

  FIG. 3 is a comparison diagram comparing the upper inversion vibration mode in the present embodiment and the upper inversion vibration mode in the comparative example. FIG. 4 is a graph showing the time variation of vibration in the central portion (marked with a circle in FIG. 3) of the windshield 1 that is the maximum point of the amplitude in the comparative example and the present embodiment. Note that times t1, t2, and t3 in FIG. 3 correspond to times t1, t2, and t3 in FIG.

  In FIG. 4, time A indicates the upper inversion timing of the first wiper blade 10, and time B indicates the upper inversion timing of the second wiper blade 11. Therefore, in FIGS. 3 and 4, the first wiper blade 10 is turned up before time t1, and the second wiper blade 11 is turned up between time t1 and time t2.

  As can be seen from FIGS. 3 and 4, in the comparative example, the vibration of the windshield 1 continues for a long time, whereas in the present embodiment, the vibration of the windshield 1 is attenuated in a shorter time than in the comparative example.

  Explaining this reason, in the comparative example, the first and second wiper blades 10 and 11 are simultaneously reversed to simultaneously apply an impact force to the windshield 1. Excited vibration (hereinafter referred to as vibration by the first wiper blade 10) and vibration excited by the impact force applied to the windshield 1 by the second wiper blade 11 (hereinafter referred to as vibration by the second wiper blade 11). .) Will overlap.

  On the other hand, in this embodiment, since the upper reversal timing of the first and second wiper blades 10 and 11 is shifted by a predetermined time Δt, the vibration by the first wiper blade 10 and the vibration by the second wiper blade 11 are mutually different. This is because it will be offset.

  Here, a setting example of the time difference (predetermined time) Δt of the upper inversion timing is shown. In this example, the time difference Δt of the upper inversion timing is set so as to satisfy the following formula 1.

(Equation 1)
Δt = T / 2
However, T is the period of the vibration mode at the predetermined frequency F.

  That is, the time difference Δt of the upper inversion timing is a time corresponding to a half cycle of the vibration mode at the predetermined frequency F. As the predetermined frequency F, a frequency at which the inverted sound is desired to be reduced is selected. As the predetermined frequency F, it is preferable to select a frequency of 250 Hz or less that makes humans feel uncomfortable or a frequency of 20 Hz or more that is a human audible range.

  In this example, 50 Hz is selected as the predetermined frequency F because it is desired to reduce the upper inversion sound of the frequency 50 Hz. Therefore, the time difference Δt of the upper inversion timing is 10 ms (T = 1/50 Hz = 20 ms, Δt = 20 ms / 2 = 10 ms).

  Thus, in this example, the upper inversion timing of the first and second wiper blades 10 and 11 is shifted by the half cycle of the vibration mode at the predetermined frequency F (50 Hz). The vibration caused by the first wiper blade 10 and the vibration caused by the second wiper blade 11 can be effectively canceled, and the vibration can be attenuated in a shorter time.

  The time difference Δt of the upper inversion timing may be set so as to satisfy the following formula 2.

(Equation 2)
T / 4 ≦ Δt ≦ 3T / 4
Further, the time difference Δt of the upper inversion timing may be set so as to satisfy the following Expression 3.

(Equation 3)
(1/4 + n) T ≦ Δt ≦ (3/4 + n) T
However, n is a predetermined natural number.

  Further, the time difference Δt of the upper inversion timing may be set so as to satisfy the following formula 4.

(Equation 4)
Δt = (1/2 + n) T
However, n is a predetermined natural number.

  Even if the time difference Δt of the upper reversal timing is set in this way, the vibration by the first wiper blade 10 and the vibration by the first and second wiper blades 11 cancel each other, so that the vibration at the time of the upper reversal can be reduced in a short time Attenuation can be achieved, and as a result, the volume of the inverted sound felt by humans can be reduced.

  Further, in this example, the first wiper blade 10 having the larger vibration mode amplitude at the predetermined frequency F (50 Hz) out of the first and second wiper blades 10 and 11 is reversed first to obtain the predetermined frequency F (50 Hz). Since the second wiper blade 11 having the smaller amplitude of the vibration mode in (2) is inverted later, the vibration can be attenuated in a shorter time.

  As described above, in this embodiment, since the vibration at the time of the upper reversal can be attenuated in a short time, the magnitude of the reversal sound felt by humans can be greatly reduced. For this reason, compared with what attached an auxiliary blade or a roller to a wiper blade as a countermeasure against inversion sound like the above-mentioned prior art, a simplification of a structure and size reduction can be achieved.

(Second Embodiment)
In the first embodiment, means for shifting the upper reversal timing of the first and second wiper blades 10 and 11 by a predetermined time is constituted by the connecting mechanism 15, but in the second embodiment, as shown in FIG. A means for shifting the upper inversion timing of the first and second wiper blades 10 and 11 by a predetermined time is constituted by the motor control device 14.

  The drive device 12 according to the present embodiment includes first and second wiper motors 30 and 31, and connects the first wiper motor 30 and the first wiper blade 10 via a connection mechanism 32. And the second wiper blade 11 are connected via the connecting mechanism 33, so that the first and second wiper blades 10 and 11 are independently driven by the first and second wiper motors 30 and 31.

  The coupling mechanism 32 includes a crank arm 34, a link rod 35, a lever 36, and a wiper arm 37. Similarly, the coupling mechanism 33 includes a crank arm 38, a link rod 39, a lever 40, and a wiper arm 41.

  FIG. 6 is a pattern diagram showing a control pattern of the first and second wiper motors 30 and 31 by the motor control device 14. The first and second wiper motors 30 and 31 operate synchronously as a whole, but the upper reversal timing of the first and second wiper blades 10 and 11 is shifted by a predetermined time, and the first and second wiper blades 10 and 11 are also moved. The lower inversion timing is controlled to be shifted by a predetermined time.

  In this example, the time difference (predetermined time) of the upper inversion timing and the time difference (predetermined time) of the lower inversion timing are individually set. The setting of the time difference of the upper inversion timing is the same as that in the first embodiment. That is, the first wiper blade 10 is turned up first, and the second wiper blade 11 is turned up 10 ms later. Therefore, similarly to the first embodiment, the vibration at the time of the upper reversal can be attenuated in a short time.

  Next, the setting of the time difference of the lower inversion timing will be described. FIG. 7 is an explanatory diagram illustrating the vibration mode of the windshield 1 that is excited by the downward inversion of the first and second wiper blades 10 and 11 in the comparative example described above.

  In this comparative example, since the lower inversion sound becomes louder at a frequency of 80 Hz, FIG. 7A shows the lower inversion vibration mode at a frequency of 80 Hz. FIG. 7B is a cross-sectional view of the lower inversion vibration mode in FIG.

  In this example, the time difference (predetermined time) Δt of the lower inversion timing is set so as to satisfy the above-described Expression 1. That is, the frequency at which the inverted sound is desired to be reduced is selected as the predetermined frequency F, and the lower inversion timing is shifted by a time corresponding to a half cycle of the vibration mode at the predetermined frequency F.

  In this example, since it is desired to reduce the inverted sound at a frequency of 80 Hz, the predetermined frequency F is set to 80 Hz. Therefore, the time difference of the lower inversion timing is 6.25 ms (T = 1/80 Hz = 12.5 ms, Δt = 12.5 ms / 2 = 6.25 ms).

  As can be seen from FIG. 7B, in the vibration mode at a frequency of 80 Hz, the excitation position (striking point) L2 by the first wiper blade 10 and the excitation position (striking point) R2 by the second wiper blade 11 are in phase. It has become.

  The amplitude of the second wiper blade 11 at the vibration position L2 is larger than the amplitude of the first wiper blade 10 at the vibration position R2. Therefore, in this example, the second wiper blade 11 having the larger amplitude is inverted first, and the first wiper blade 10 having the smaller amplitude is inverted later.

As described above, even during the downward inversion, the vibrations of the first wiper blade 10 and the vibrations of the second wiper blade 11 are effectively canceled in the same manner as in the upward inversion, so that the vibration during the downward inversion can be reduced in a short time. In this way, in this embodiment, since both the vibration at the time of the upper reversal and the vibration at the time of the lower reversal can be attenuated in a short time, the magnitude of the reversal sound felt by humans is further greatly increased. Can be reduced.

  In this example, the time difference of the lower inversion timing is set using the above-described equation 1, but the time difference of the lower inversion timing may be set using the above-described equations 2 to 4.

  In this example, the vertical inversion timing of the first and second wiper blades 10 and 11 is shifted by electrical control of the wiper motors 30 and 31, but the first and second wipers are moved by a mechanical mechanism such as a link mechanism. The upside down timing of the blades 10 and 11 may be shifted.

(Other embodiments)
In the first embodiment, the upper inversion timings of the first and second wiper blades 10 and 11 are shifted by a predetermined time, and the lower inversion timings of the first and second wiper blades 10 and 11 are matched. On the contrary, the upper inversion timing of the first and second wiper blades 10 and 11 may be made to coincide with each other, and the lower inversion timing of the first and second wiper blades 10 and 11 may be shifted by a predetermined time. In this case, it is possible to reduce the volume of the inverted sound at the time of the lower inversion.

  In the second embodiment, the vertical inversion timing of the first and second wiper blades 10 and 11 is shifted by a predetermined time. However, the upper and lower inversion timings of the first and second wiper blades 10 and 11 are changed. Only one of the inversion timings may be shifted to match the other inversion timing.

  Moreover, each said embodiment is only what showed the example of 1 structure of the connection mechanisms 15,32,33, and if it has the same function, it will not be limited to each said embodiment, but the connection mechanism 15 Of course, it is possible to variously change the configuration of.

  In each of the above embodiments, the wiper device according to the present invention is applied to a windshield wiper device for a vehicle. However, the present invention is not limited to this, and the present invention is applied to various wiper devices. It is possible to apply.

It is a whole lineblock diagram showing the outline of the wiper device in a 1st embodiment of the present invention. It is explanatory drawing explaining the upper inversion vibration mode in a comparative example. It is the comparison figure which compared the upper inversion vibration mode in 1st Embodiment, and the upper inversion vibration mode in a comparative example. It is a graph which shows the time change of the vibration in the center part of a windshield comparing with a comparative example and this embodiment. It is a whole block diagram which shows typically the wiper apparatus in 2nd Embodiment. It is a pattern diagram which shows the control pattern of the wiper motor by a motor control apparatus. It is explanatory drawing explaining the lower inversion vibration mode in a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 1st wiper blade 11 2nd wiper blade 12 Drive apparatus 15 Connection mechanism (means to shift inversion timing)

Claims (9)

A first wiper blade (10) and a second wiper blade (11) disposed on the surface of the wiping object (1);
A driving device (12) for reciprocating the first and second wiper blades (10, 11) on the surface of the wiping object (1);
When the moving direction of the first wiper blade (10) reverses, the vibration of the wiping object excited by the impact force applied to the wiping object (1) by the first wiper blade (10) is a first. The wiping object (1) excited by an impact force applied to the wiping object (1) by the second wiper blade (11) when the moving direction of the second wiper blade (11) is reversed. When the second vibration is the vibration of
The inversion timing of the first wiper blade (10) and the inversion timing of the second wiper blade (11) are predetermined so that the first vibration and the second vibration are canceled out in a vibration mode at a predetermined frequency. Means for shifting time (14, 15) is provided in the drive device (12) ;
When the predetermined time is Δt and the vibration period of the vibration mode at the predetermined frequency is T,
A wiper device characterized by satisfying a relationship of (1/4 + n) T ≦ Δt ≦ (3/4 + n) T.
However, n is a predetermined natural number. When the predetermined time is Δt and the vibration period of the vibration mode at the predetermined frequency is T,
The wiper device according to claim 1, wherein a relationship of Δt = (½ + n) T is satisfied.
However, n is a predetermined natural number. The wiper device according to claim 1 or 2 , wherein the predetermined natural number n is 1. The means (14, 15) first inverts the wiper blade having the larger vibration mode amplitude at the predetermined frequency among the first and second wiper blades (10, 11) to vibrate at the predetermined frequency. The wiper device according to any one of claims 1 to 3 , wherein a wiper blade having a smaller mode amplitude is reversed after the predetermined time. The wiper device according to any one of claims 1 to 4 , wherein the predetermined frequency is 250 Hz or less. The wiper device according to any one of claims 1 to 5 , wherein the predetermined frequency is 20 Hz or more. Only when one of the first and second wiper blades (10, 11) is reversed during the first reversal when the moving direction is reversed from the forward direction to the backward direction and during the second reversal when the moving direction is reversed from the backward direction to the forward direction. in said means (14, 15) is inverted timing as the inversion timing of claims 1 to 6, characterized in that shifting the predetermined time of the second wiper blade (11) of the first wiper blade (10) The wiper apparatus as described in any one. At the time of the first reversal when the moving direction of the first and second wiper blades (10, 11) is reversed from the forward direction to the backward direction and at the time of the second reversal when the reverse direction is reversed from the backward direction to the forward direction, any one of claims 1 to 6 and inversion timing, characterized in that shifting the predetermined time of said means (14, 15) is the second wiper blade and the inversion timing of the first wiper blade (10) (11) The wiper apparatus as described in one. The wiper device according to claim 8 , wherein the predetermined time is individually set for the first inversion and the second inversion.

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