JP2013119299A - Wiper apparatus and camera unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wiper apparatus and a camera unit that can be miniaturized.SOLUTION: In a wiper apparatus 1 for wiping dirt of an object 3 by reciprocating a blade 10 in which hinges 13 forming supporting points are arranged around the object 3, the blade 10 includes at least one of hinges 11, 12 in addition to the hinges 13 forming the supporting points, and turnable arm parts 14-16 which are divided by the hinges 11-13 including the hinges 13 forming the supporting points with a permanent magnet 18 being built therein. An electromagnet 20 for reciprocating the blade 10 by the attraction or repulsion of the permanent magnet 18 by reversing the polarity, is arranged around the object 3.

Description

  The present invention relates to a wiper device and a camera unit for wiping off dirt adhered to a glass surface or the like.

Depending on the location of the camera lens or a glass surface such as a cover glass that covers the lens, dirt such as dust, dust, and water droplets may adhere and the camera image may deteriorate. In particular, in-vehicle cameras are changing from recognition for recognizing places that are difficult to see from the driver's seat to detection for detecting obstacles and the like, and if the camera image deteriorates due to dirt or the like, erroneous detection is caused. There is a fear.
For example, as a technique for wiping off dirt adhered to a cover glass of a camera, a technique in which a wiper device driven by a motor is attached to a cover glass is known (for example, see Patent Document 1).

JP 2007-145044

However, since the conventional wiper device is relatively large because it uses a motor, it cannot be applied to products that require downsizing such as in-vehicle cameras. Therefore, in a vehicle-mounted camera, it is mainstream to artificially clean the lens or cover glass. When the lens or cover glass is artificially cleaned, not only is the work complicated, but for example, in construction machinery and special equipment vehicles, dirt, dust, mud, sand, etc. are severe and in large vehicles Since the camera mounting position is high, it is difficult to clean artificially.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a wiper device and a camera unit that can be miniaturized.

  In order to achieve the above object, the present invention provides a wiper device that reciprocates a blade portion in which a joint portion serving as a fulcrum is disposed around an object to wipe away dirt on the object. In addition to the joint part serving as a fulcrum, the arm part is divided by at least one joint part and a joint part including the joint part serving as the fulcrum, and includes a rotatable arm part with a built-in permanent magnet. Is characterized in that an electromagnet is arranged that attracts or repels the permanent magnet by reversing the polarity to reciprocate the blade portion.

  The said structure WHEREIN: It is preferable to make a rotation angle small, so that the arm part which leaves | separates from the fulcrum of the said blade part.

  The said structure WHEREIN: It is preferable to form lightly as the arm part which leaves | separates from the fulcrum of the said blade part.

  The said structure WHEREIN: It is preferable that the magnetic field direction of the said electromagnet inclines with respect to the surface of the said target object.

  In the above configuration, a plurality of permanent magnets are built in the blade part, the electromagnets are arranged at positions corresponding to the plurality of permanent magnets, and the number of coil turns is increased as the electromagnet is closer to the fulcrum of the blade part. preferable.

  Further, the present invention relates to a camera unit including a wiper device that reciprocates a blade portion in which a joint portion serving as a fulcrum is arranged around the lens of the camera to wipe off dirt on the lens or the cover glass covering the lens. The blade part includes at least one joint part in addition to the joint part serving as the fulcrum, and a rotatable arm part that is divided by a joint part including the joint part serving as the fulcrum and has a built-in permanent magnet, Around the lens, an electromagnet is arranged to reciprocate the blade portion by attracting or repelling the permanent magnet by reversing the polarity.

  According to the present invention, the blade portion has a built-in permanent magnet, and an electromagnet that moves the blade portion back and forth by attracting or repelling the permanent magnet by reversing the polarity is disposed around the object. The blade portion can be driven without using it, and the wiper device can be miniaturized. In addition, since the blade part includes at least one joint part other than the joint part serving as a fulcrum and a rotatable arm part including a permanent magnet that is divided by a joint part including the joint part serving as a fulcrum, The operating range of the blade portion can be reduced, and the wiper device can be reduced in size.

It is a front view which shows the camera unit which concerns on the 1st Embodiment of this invention. It is a figure which shows the front of a braid | blade part, a plane, and a back surface. It is a figure which shows the cross section of a blade part, (A) is the AA cross section in the top view of FIG. 2, (B) is the BB cross section in the top view of FIG. 2, (C) is the plane of FIG. It is a figure which shows CC cross section in a figure. It is a figure which shows the rotation angle of a blade part. It is a figure which shows the front surface, side surface, and plane of an electromagnet. It is a figure which shows the contact method of a braid | blade part and an electromagnet. It is a figure which shows the circuit diagram of a wiper apparatus. It is a figure which shows the voltage which a bridge driver circuit outputs, (A) is a figure which shows the voltage applied to the terminal A, (B) is a figure which shows the voltage applied to the terminal B. It is a flowchart which shows operation | movement of the wiper apparatus at the time of starting. It is a front view which shows the wiper apparatus in the state where a blade part is located in a center part. It is a front view showing a wiper device in the state where a blade part is located in the upper part. It is a front view which shows the wiper apparatus in the state where a blade part is located in a center part. It is a front view showing a wiper device in the state where a blade part is located in the lower part. It is a flowchart which shows operation | movement of the wiper apparatus at the time of a stop. It is a front view which shows the wiper apparatus which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows a blade part. It is a front view which shows the wiper apparatus which concerns on the 3rd Embodiment of this invention. It is a front view which shows the wiper apparatus which concerns on the 4th Embodiment of this invention. It is a front view which shows the wiper apparatus which concerns on the 5th Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the drawings.
<First Embodiment>
FIG. 1 is a front view showing a camera unit according to the first embodiment.
The camera unit U includes a wiper device 1. The wiper device 1 is, for example, a wiper device for a camera (not shown) provided at the rear or front of an automobile. The camera is arranged in the housing 2, and the lens 3 (object) of the camera is exposed from the front surface 2 </ b> A of the housing 2. The lens 3 is disposed substantially upright with the optical axis 3A in the horizontal direction, and the surface of the lens 3 is formed in a spherical shape.
The wiper device 1 includes a blade portion 10 that wipes dirt from the lens 3 and an electromagnet 20 that is disposed around the lens 3 and drives the blade portion 10.

FIG. 2 is a diagram illustrating a front surface, a plane surface, and a rear surface of the blade unit 10. 3A and 3B are cross-sectional views of the blade portion 10, where FIG. 3A is a cross-sectional view taken along the line AA in FIG. 2, FIG. 3B is a cross-sectional view taken along the line BB in FIG. It is a figure which shows CC cross section in the top view of FIG. FIG. 4 is a diagram illustrating the rotation angles θ1 to θ3 of the blade unit 10.
As shown in FIGS. 1 and 2, one end portion 10 </ b> A of the blade portion 10 is rotatably supported by a support shaft 13 </ b> A fixed to the casing 2 around the lens 3 (left side in FIG. 1). The other end portion 10B is a free end, and the blade portion 10 reciprocates in the vertical direction within the operation range including the surface of the lens 3 with the support shaft 13A as a fulcrum. The blade portion 10 includes a plurality of (two) joint portions 11 and 12 that are rotatable, and arm portions 14 to 16 (three) divided by the joint portions 11 and 12.

Here, let the joint part 11 far from the support shaft 13A be the first joint part 11, and the joint part 12 closer to the support shaft 13A be the second joint part 12. The first joint part 11 is composed of a connecting part 11A for connecting the arm parts 14 and 15, and hole parts 11B and 11C formed in the arm parts 14 and 15, and the second joint part 12 is similarly configured with the arm parts 15 and 15C. The connecting portion 12 </ b> A for connecting 16 and the hole portions 12 </ b> B and 12 </ b> C formed in the arm portions 15 and 16. A support hole 13B through which the support shaft 13A is inserted is formed in one end portion 10A of the blade portion 10, and the third joint portion 13 of the blade portion 10 is configured by the support shaft 13A and the support hole 13B.
The arm portions 14 to 16 are referred to as a first arm portion 14, a second arm portion 15, and a third arm portion 16 in order from the support shaft 13 </ b> A. The lengths of the arm portions 14 to 16 are set such that the arm portions 14 to 16 can be disposed substantially along the outer periphery of the lens 3 and can wipe the entire surface of the lens 3 when the blade portion 10 reciprocates.

The arm portions 14 to 16 are curved in an arch shape along the spherical surface of the surface of the lens 3, and an appropriate stress is applied to the lens 3 due to bending, and a durable material (for example, nickel, It is made of a metal such as a titanium alloy or a thermoplastic resin such as nylon, polyethylene, or polyetherimide). Moreover, as shown in FIG.2 and FIG.3, the arm parts 14-16 become a light shape so that it leaves | separates from the 3rd joint part 13 used as a fulcrum in consideration of moment force, and in this Embodiment, for example, The arm portion that is farther from the third joint portion 13 is lighter by being formed thinner. The upper and lower surfaces of the arm portions 14 to 16 are tapered surfaces 14A to 16A.
A wiper rubber 17 for wiping off dirt on the lens 3 is attached to each of the arms 14 to 16, and a permanent magnet 18 is incorporated therein. The permanent magnets 18 are arranged so that their magnetic poles are aligned along the reciprocating direction of the blade portion 10. In this embodiment, each permanent magnet 18 has its N pole facing upward and its S pole facing downward. It is arranged to face the side. Each permanent magnet 18 has a substantially trapezoidal cross-sectional shape along the tapered surfaces 14A to 16A, but the shape of the permanent magnet 18 is not limited to this.

  As shown in FIG. 4, the rotation angles θ <b> 1 to θ <b> 3 of the arm portions 14 to 16 are limited as they move away from the third joint portion 13 serving as a fulcrum, and the rotation angle of the first arm portion 14. It is constrained as θ1 <rotation angle θ2 of the second arm portion 15 <rotation angle θ3 of the third arm portion 16. In the present embodiment, for example, the rotation angle θ1 of the first arm portion 14 is ± 30 ° from the horizontal plane H, the rotation angle θ2 of the second arm portion 15 is ± 60 ° from the horizontal plane H, and the third arm portion 16 The rotation angle θ3 is set to ± 90 ° from the horizontal plane H.

As shown in FIG. 1, the electromagnet 20 reverses the polarity to attract or repel the permanent magnet 18 of the blade portion 10 to reciprocate the blade portion 10, and drives the blade portion 10 together with the permanent magnet 18. The drive unit is configured. A plurality (three) of electromagnets 20 are provided on the upper side and the lower side of the lens 3 corresponding to the arm portions 14 to 16 of the blade portion 10. These electromagnets 20 are arranged with a space R for retracting the blade portion 10 between the electromagnets 20.
Each electromagnet 20 is configured by winding a copper coil 22 around a magnetic body 21 such as iron. The six electromagnets 20 have the same winding direction of the coil 22 and are connected in series. In the present embodiment, a plurality of coils 22 are formed by winding a single wire around each magnetic body 21 in the same direction, and a plurality of coils 22 are connected in series to form terminals that constitute the ends of the wires. A and B are positioned on the third joint portion 13 side of the blade portion 10.
Here, each of the electromagnets 20 is distinguished from the electromagnets 20A to 20F, and the coils 22 are also denoted by the same symbols as the coils 22A to 20F corresponding to the electromagnets 20A to 20F. It shall be indicated separately.

The wiper device 1 is configured to magnetize the electromagnet 20 in the order of the third arm portion 16, the second arm portion 15, and the first arm portion 14. More specifically, the magnetic field strength H is proportional to the coil winding number No when the current I flowing through the coil 22 is constant as shown in the following relational expression (1).
H = No × I (1)
In the present embodiment, the number of turns for the upper three coils 22A to 22C is set to coil 22A> coil 22B> coil 22C>, and the number of turns for the lower three coils 22D to 22F is similarly set to coil 22D. By setting> coil 22E> coil 22F>, the third arm portion 16 is first magnetically attached to the electromagnet 20, and the second arm portion 15 and the first arm portion 14 are in this order to be magnetically attached to the electromagnet 20. In the present embodiment, the number of turns is set to coil 22A = coil 22D, coil 22B = coil 22E, coil 22C = coil 22F, and the corresponding coils 22A to 22F on the upper side and the lower side have the same number of turns. The strength of the magnetic field generated by the electromagnet 20 is set so that the force that moves the blade portion 10 upward by magnetic force is larger than the force due to the weight of the blade portion 10.

FIG. 5 is a diagram illustrating the front, side, and plane of the electromagnet 20B. FIG. 6 is a diagram illustrating a contact method between the blade unit 10 and the electromagnet 20 (electromagnet 20A). In addition, since electromagnet 20A, 20C-20F is the structure substantially the same as electromagnet 20B, it attaches and shows the same code | symbol to the same part, and abbreviate | omits description.
As for the magnetic body 21 of each electromagnet 20B, the surface which contacts the taper surfaces 14A-16A of the blade part 10 becomes the taper part 21A.
The coil 22 is wound around the magnetic body 21 with an inclination with respect to the vertical plane V (corresponding to the front surface 2A of the housing 2), and the magnetic field directions Y1 and Y2 of the electromagnet 20A are with respect to the surface of the lens 3. Tilted. Therefore, for example, when a current is applied in the X1 direction to the coil 22A of the electromagnet 20A, a magnetic field is generated in the Y1 direction. The blade unit 10 includes a driving force F1 that moves the blade unit 10 toward the electromagnet 20A, and a blade unit. An attraction force F2 for attracting 10 to the lens 3 side will act. On the other hand, when a current is passed in the X2 direction, a magnetic field is generated in the Y2 direction. The blade portion 10 has a driving force F3 that moves the blade portion 10 away from the electromagnet 20A, and the blade portion 10 is detached from the lens 3. The desorption force F4 to work will work.

  In the following description, when a current flows in the X1 direction and a magnetic field is generated in the Y1 direction, and the taper portion 21A side becomes the S pole, the current flows in the X2 direction when the electromagnet 20 changes to the S polarity. When the magnetic field is generated in the Y2 direction and the taper portion 21A side becomes the N pole, the electromagnet 20 is changed to the N polarity.

FIG. 7 is a diagram schematically showing a circuit diagram of the wiper device 1. 8 is a diagram illustrating a voltage output from the bridge driver circuit 31. FIG. 8A illustrates a voltage applied to the terminal A, and FIG. 8B illustrates a voltage applied to the terminal B. is there.
As shown in FIG. 7, the wiper device 1 includes a control unit 30 that controls a current flowing through the coil 22 and a bridge driver circuit (current direction inversion unit) connected to both ends (terminals A and B) of the plurality of coils 22. 31 and a power supply unit 32 that supplies power to the bridge driver circuit 31 under the control of the control unit 30.
As shown in FIGS. 7 and 8, the bridge driver circuit 31 reverses the direction of voltage application between the terminals A and B every predetermined time under the control of the control unit 30 so that the direction of the current flowing through the coil 22 is reversed. This is a circuit that changes the polarity of the electromagnet 20 by changing. For example, when the bridge driver circuit 31 applies a voltage in the forward direction so that the voltage at one terminal A is a predetermined positive voltage (+ V) and the voltage at the other terminal B is 0, the current is transferred from the terminal A to the terminal B. The polarity of the electromagnet 20 becomes the S pole. On the other hand, when the bridge driver circuit 31 applies a voltage in the reverse direction so that the voltage at the terminal A is 0 and the voltage at the terminal B is a predetermined positive voltage (+ V), current flows from the terminal B to the terminal A, and the electromagnet The polarity of 20 becomes the N pole.

  When a wiper power source (not shown) provided in the wiper device 1 (FIG. 1) is turned on, the control unit 30 causes the power supply unit 32 to start supplying power to the bridge driver circuit 31 and causes the bridge driver circuit 31 to Start voltage output. When the wiper power supply is turned off, the control unit 30 applies the voltage in the reverse direction when the blade unit 10 is located at the retracted position below the lens 3, that is, the electromagnet 20 When the polarity is reached, the bridge driver circuit 31 is stopped from applying voltage, and the power supply unit 32 is stopped from supplying power to the bridge driver circuit 31. The wiper power supply may be turned ON / OFF manually. When a sensor for detecting dirt on the lens 3 (FIG. 1) is provided, the wiper power supply is turned ON / OFF according to the output of the sensor. May be.

Next, the operation of the present embodiment will be described.
FIG. 9 is a flowchart showing the operation of the wiper device 1 at the time of activation. FIG. 10 is a front view showing the wiper device 1 in a state where the blade portion 10 is located at the center portion. FIG. 11 is a front view showing the wiper device 1 in a state where the blade portion 10 is located on the upper side. FIG. 12 is a front view showing the wiper device 1 in a state where the blade portion 10 is located at the center portion. FIG. 13 is a front view showing the wiper device 1 in a state where the blade portion 10 is located on the lower side. In FIG. 10, FIG. 12 and FIG. 13, the coil 22 is omitted.
When no current is supplied to the coil 22 of the electromagnet 20, the blade unit 10 is in a retracted position on the lower outer side of the lens 3 as shown in FIG. 1.

First, as shown in FIG. 9, when the wiper power is turned on (step S1), the power supply unit 32 starts to supply power to the bridge driver circuit 31 under the control of the control unit 30 (step S2). The bridge driver circuit 31 applies a voltage in the forward direction for a predetermined time (A: + V, B: 0) (step S3). As a result, the electromagnet 20 changes to S polarity (step S4), the blade unit 10 is driven to the upper side of the lens 3, and the dirt adhering to the lens 3 is wiped off (lens cleaning) (step S5).
More specifically, as shown in FIG. 10, when the electromagnet 20 has an S polarity, the blade portion 10 receives the repulsive force FR from the lower electromagnets 20 </ b> D to 20 </ b> F and the permanent magnet 18. N poles of the magnets receive the attractive force FA from the upper electromagnets 20A to 20C. With these repulsive force FR and suction force FA, the blade portion 10 moves to the retracted position above and outside the lens 3 as shown in FIG.

At this time, since the blade portion 10 has the arm portions 14 to 16 that are rotatable with respect to the joint portions 11 to 13, the arm portions 14 to 16 move while rotating, so that the rod portion without the joint portions 11 to 13 is provided. The operating range of the blade unit 10 can be made smaller than that of the blade unit.
Further, since the rotation angle θ1 of the first arm portion 14 <the rotation angle θ2 of the second arm portion 15 <the rotation angle θ3 of the third arm portion 16, the arm portions 14 to 16 have upper and lower electromagnets 20 </ b> A to 20 </ b> F. The magnets are not magnetized separately, and are magnetized on the upper three electromagnets 20A to 20C or the lower three electromagnets 20D to 20F. Further, by restricting the rotation angles θ1 to θ3 of the arm portions 14 to 16 as described above, the arm portions 14 to 16 are magnetized to the determined electromagnets 20A and 20D, electromagnets 20B and 20E, and electromagnets 20C and 20F. To wear. Thereby, the blade part 10 can clean the whole surface of the lens 3.
Furthermore, since the strength of the magnetic field of the electromagnets 20A to 20F is set to electromagnets 20A, 20D> electromagnets 20B, 20E> electromagnets 20C, 20F, the arm portion 16, the arm portion 15, and the arm portion 14 are magnetically attached to the electromagnet 20 in this order. The blade unit 10 can clean the entire surface of the lens 3.

In addition, as shown in FIG. 6, the electromagnet 20 is configured such that the magnetic field directions Y1 and Y2 are inclined with respect to the surface of the lens 3, so that the blade portion 10 can be attracted to the lens 3 side. Dirt can be wiped off reliably.
In addition, by making the contact surfaces of the blade portion 10 and the magnetic body 21 both tapered, when the blade portion 10 is magnetically attached to the electromagnet 20, the blade portion 10 and the magnetic body 21 are slightly in contact with each other. It is possible to prevent the blade portion 10 from being subjected to stress such as bending or twisting. Furthermore, by making the magnetic body 21 of the electromagnet 20 into a tapered shape, it is possible to prevent the blade portion 10 from moving into an image (vignetting).

Next, as shown in FIG. 9, the bridge driver circuit 31 applies a voltage in the reverse direction for a predetermined time (A: 0, B: + V) (step S6). As a result, the electromagnet 20 changes to N polarity (step S7), the blade unit 10 is driven to the lower side of the lens 3, and the dirt on the lens 3 is wiped off (lens cleaning) (step S8).
More specifically, as shown in FIG. 12, when the electromagnet 20 becomes N-polar, the blade unit 10 receives the repulsive force FR from the upper electromagnets 20 </ b> A to 20 </ b> C at the N pole of the permanent magnet 18, and The south pole receives an attractive force from the lower electromagnets 20C to 20F. Due to the repulsive force FR and the suction force FA, the blade portion 10 moves to the retracted position outside the lens 3 as shown in FIG. The operations in steps S3 to S8 shown in FIG. 9 are continued until the wiper power is turned off.

FIG. 14 is a flowchart showing the operation of the wiper device 1 when stopped.
When the wiper power supply is turned off (step S11), the bridge driver circuit 31 applies the voltage in the reverse direction, and stops applying the voltage under the control of the control unit 30 when the electromagnet 20 has the N polarity. (Step S12). Thereby, when the blade part 10 is located in the retracted position outside the lower side of the lens 3, the electromagnet 20 changes to a magnetic member (step S13), and the permanent magnet 18 and the lower side of the blade part 10 and the electromagnets 20D to 20F The magnetic member is magnetized (step S24), and the operation of the wiper device 1 is completed.
As described above, when the blade unit 10 is positioned on the lower outer side of the lens 3, the energization of the electromagnet 20 is stopped, so that the blade unit 10 is self-weighted and the permanent magnet 18 and the magnetic body 21 of the electromagnet 20 It can be fixed by the magnetic force between them. As a result, when the operation of the wiper device 1 is stopped, it is possible to prevent the blade unit 10 from moving into an image and to suppress current consumption. In addition, it is possible to prevent inhibition of EMC (Electro-Magnetic Compatibility) due to the magnetic force of the electromagnet 20.

  As described above, according to the present embodiment, the blade unit 10 incorporates the permanent magnet 18, and the permanent magnet 18 is attracted or repelled around the lens 3 by reversing the polarity. An electromagnet 20 for reciprocating 10 is arranged. With this configuration, the blade unit 10 can be driven without using a motor, and the wiper device 1 can be downsized. Moreover, since the blade part 10 includes a plurality of joint parts 11 and 12 and arm parts 14 to 16 which are divided by the plurality of joint parts 11 and 12 and are rotatable with respect to the joint parts 11 to 13, Compared to a rod-shaped blade portion without the joint portions 11 to 13, the operating range of the blade portion 10 can be reduced, and the wiper device 1 can be downsized.

  Further, according to the present embodiment, since the rotation angles θ1 to θ3 are made smaller as the arm part is farther from the fulcrum of the blade part 10, the arm parts 14 to 16 can be magnetized to the electromagnets 20A to 20F where the arm parts 14 to 16 are aimed. As a result, the entire surface of the lens 3 can be wiped off reliably.

  In addition, according to the present embodiment, the arm portions 14 to 16 are formed so lightly that they are separated from the fulcrum of the blade portion 10, so that the arm portions 15 and 16 having a small moment close to the fulcrum of the blade portion 10 In contrast, suction or repulsion can be ensured.

  Further, according to the present embodiment, since the magnetic field direction Y1-Y2 of the electromagnet 20 is inclined with respect to the surface of the lens 3, a force that presses the blade portion 10 against the lens 3 is generated, and dirt on the lens 3 is ensured. Can be wiped away.

  Further, according to the present embodiment, a plurality of permanent magnets 18 are built in the blade portion 10, the electromagnets 20 are arranged at positions corresponding to the plurality of permanent magnets 18, and the electromagnet 20 that is closer to the fulcrum of the blade portion 10. The number of turns of the coil 22 is increased. Thereby, the arm parts 14-16 can be magnetically attached to the electromagnet 20 in order from the side close | similar to the fulcrum of the braid | blade part 10, and the whole surface area of the lens 3 can be wiped off reliably.

<Second Embodiment>
Next, a second embodiment according to the present invention will be described with reference to FIGS.
FIG. 15 is a front view showing the wiper device 100 according to the second embodiment. FIG. 16 is a cross-sectional view of the blade part 110. In FIG. 15 and FIG. 16, the same parts as those in the wiper device 1 of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
In the second embodiment, the other end portion of the blade portion is rotatably supported, no permanent magnet is provided on the second arm portion, and no electromagnet corresponding to the second arm portion is provided. Different from the first embodiment.

The wiper device 100 includes a blade part 110 and an electromagnet 20. One end portion 110A and the other end portion 110B of the blade portion 110 are rotatably supported by a support shaft 113A fixed to the casing 2 around the lens 3, and the blade portion 110 covers the surface of the lens 3 with the support shaft 113A as a fulcrum. It reciprocates up and down within the operating range.
A support hole 113B through which the support shaft 113A is inserted is formed in the one end portion 110A and the other end portion 110B of the blade portion 110, and the joint portion 113 serving as a fulcrum of the blade portion 110 is formed by the support shaft 113A and the support hole 113B. It is configured.

The blade portion 110 further includes a plurality (two) of joint portions 111 and 112 and a plurality of (three) arm portions 114 to 116 divided by the joint portions 111 and 112. The joint portion 111 includes a pin-like connecting portion 111A that connects the arm portions 114 and 115, and holes 111B and 111C formed in the arm portions 114 and 115. The hole portion 111C is formed as an elongated hole, and the connecting portion 111A can slide along the hole portion 111C. The joint portion 112 includes a connecting portion 112A that connects the arm portions 115 and 116, and hole portions 112B and 112C formed in the arm portions 115 and 116. The joint portion 111 is the first joint portion 111, the joint portion 112 is the second joint portion 112, the joint portion 113 is the third joint portion 113, the arm portion 114 is the first arm portion 114, and the arm portion 115 is the second arm. The part 115 and the arm part 116 are referred to as a third arm part 116.
A permanent magnet 18 is built in the first arm portion 114 and the third arm portion 116. The second arm portion 115 is curved in an arch shape along the spherical surface of the surface of the lens 3, and a wiper rubber 17 for wiping off dirt on the lens 3 is attached. In addition, the upper and lower surfaces of the first arm portion 114 and the third arm portion 116 that come into contact with the tapered portion 21A (FIG. 5) of the magnetic body 21 are tapered surfaces 114A and 116A.

A plurality (two) of electromagnets 20 are provided on the upper side and the lower side of the lens 3 in correspondence with the arm portions 114 and 116 of the blade portion 110.
In the present embodiment, the upper two coils 22A and 22C have the number of turns of coil 22A> coil 22C>, and the lower two coils 22D and 22F have the same number of turns of coil 22D> coil 22F. As a result, the third arm portion 16 is first magnetically attached to the electromagnet 20, and the second arm portion 15 and the first arm portion 14 are in this order to be magnetized to the electromagnet 20. In the present embodiment, the number of turns is set to coil 22A = coil 22D and coil 22C = coil 22F.

Even with the wiper device 100 configured as described above, the same operations and effects as the wiper device 1 according to the first embodiment can be obtained. In other words, by reversing the current flowing through the electromagnet 20 and reversing the polarity, the permanent magnet 18 of the blade part 110 can be attracted or repelled and the blade part 110 can be reciprocated without using a motor.
At this time, since the blade portion 110 has the arm portions 114 to 116 that can rotate with respect to the joint portions 111 to 113, the arm portions 114 to 116 move while rotating, so that the rod portion without the joint portions 111 to 113 is present. The operating range of the blade part 110 can be made smaller than that of the blade part.
Furthermore, one joint 111 of the second arm 115 is slidable and the other joint 112 is non-slidable, and the strength of the magnetic field of the magnets 20A, 20C, 20D, and 20F is set to the other joint. Since the electromagnets 20A and 20D> the electromagnets 20C and 20F are set so that the side 112 becomes stronger, the arm portion 116 is reliably rotated and is magnetically attached to the electromagnet 20A or the electromagnet 20D, and the arm portion 116 is rotated by the rotation of the arm portion 116. Since 114 is pushed out to the electromagnet 20C or electromagnet 20F side, the blade portion 110 can clean the entire surface of the lens 3.

<Third Embodiment>
Next, a third embodiment according to the present invention will be described with reference to FIG.
FIG. 17 is a front view showing a wiper device 200 according to the third embodiment. In FIG. 17, the same parts as those of the wiper device 100 according to the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.
The blade part 210 of the third embodiment has joints 211 and 212 in place of the joint parts 111 and 112 in the second embodiment. The second arm part (arm part) 215 is formed with a hole 215A over substantially the entire length of the arm part 215, and the joint 211 has a pin-like connecting part 211A for connecting the arm parts 114 and 115 and a hole part. 215A, and the joint 212 includes a pin-like connecting portion 212A for connecting the arm portions 115 and 116 and a hole portion 215A. The connecting portions 211A and 212A slide along the hole 215A as the blade portion 210 moves. The arm portion 215 has substantially the same configuration as the arm portion 115 except that a hole portion 215A is formed in place of the hole portions 111C and 112C. Is omitted.
Moreover, in this Embodiment, the winding number of the coil 22 of the electromagnet 20 is substantially the same.

The wiper device 200 configured as described above can provide the same operations and effects as the wiper device 1 according to the first embodiment. In other words, by reversing the current flowing through the electromagnet 20 and reversing the polarity, the blade part 210 can be reciprocated by attracting or repelling the permanent magnet 18 of the blade part 210 without using a motor.
At this time, since the blade part 210 has the arm parts 114 to 116 that can rotate with respect to the joint parts 113, 211, and 212, the arm parts 114, 215, and 116 move while rotating. Compared to a rod-shaped blade portion without 211, 212, the operating range of the blade portion 210 can be reduced.
Further, since the joints 211 and 212 of the second arm portion 215 are of a slide type and the strength of the magnetic fields of the electromagnets 20A, 20C, 20D, and 20F is substantially the same, the arm portions 114 and 116 are similarly rotated. The portion 110 can clean the entire surface of the lens 3.

<Fourth embodiment>
Next, a fourth embodiment according to the present invention will be described with reference to FIG.
FIG. 18 is a front view showing a wiper device 300 according to the fourth embodiment. In FIG. 18, the same parts as those in the wiper device 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
The fourth embodiment is different from the first embodiment in that the first arm portion of the blade portion is not provided and the electromagnet corresponding to the first arm portion is not provided.
One end portion 310A of the blade portion 310 is rotatably supported by a support shaft 13A fixed to the casing 2 around the lens 3, and the other end portion 310B of the blade portion 310 is a free end. The blade part 310 has a joint part 12 and two arm parts 315 and 16 divided by the joint part 12. The arm portion 315 has substantially the same configuration as the arm portion 15 except that the hole portion 11C of the first embodiment is not formed. Omitted.

The wiper device 300 configured as described above can provide the same operations and effects as the wiper device 1 according to the first embodiment. That is, by reversing the current flowing through the electromagnet 20 and reversing the polarity, the permanent magnet 18 of the blade part 310 can be attracted or repelled and the blade part 310 can be reciprocated without using a motor.
At this time, since the blade portion 210 has the arm portions 315 and 16 that can rotate with respect to the joint portions 12 and 13, the arm portions 315 and 16 move while rotating. The operation range of the blade portion 310 can be made smaller than that of the blade portion.
Further, since the strength of the magnetic field of the electromagnets 20A, 20B, 20D, and 20E is such that the electromagnets 20A and 20D> the electromagnets 20B and 20E, the arm portion 316 and the arm portion 15 are magnetically attached to the electromagnet 20 in this order. The entire surface of 3 can be cleaned.

<Fifth embodiment>
Next, a fifth embodiment according to the present invention will be described with reference to FIG.
FIG. 19 is a front view showing a wiper device 400 according to the fifth embodiment. In FIG. 19, the same parts as those of the wiper device 1 according to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
The fifth embodiment differs from the first embodiment in that the support shaft 13A is provided on the lower side of the housing 2 and the blade portion 10 is supported on the lower side of the housing 2. Accordingly, in the fifth embodiment, in addition to the same operations and effects as in the first embodiment, the blade portion 10 extends in the vertical direction, and the blade portion 10 extends in the horizontal direction. Since the influence of its own weight is weakened compared to the embodiment, the blade portion 10 can be moved even with a weak magnetic force.

However, the first to fifth embodiments described above are one aspect of the present invention, and it is needless to say that changes can be made as appropriate without departing from the spirit of the present invention.
For example, in the above-described embodiment, the lens is disposed substantially upright with the optical axis directed in the horizontal direction, but the optical axis may be disposed slightly downward from the horizontal direction. In this case, the influence of the weight of the blade portion is weakened, and the blade portion can be moved with a weak magnetic force.
In the above embodiment, the wiping target of the wiper device is described as a camera lens. However, the wiping target is not limited to this, for example, a cover glass that covers the camera lens, etc. Also good. Further, the surface shape of the lens and the cover is not limited to a spherical shape, and may be a flat shape, for example.
Further, the number of arm portions and the number of electromagnets of the blade portion are not limited to the numbers shown in the above embodiment, and can be changed as appropriate.

1,100,200,300,400 Wiper device 3 Lens (object)
10, 110, 310 Blade part 11-13, 111-113, 211, 212 Joint part 14-16, 111-116, 215, 315 Arm part 18 Permanent magnet 20, 20A-20F Electromagnet 22, 22A-22F Coil Y1- Y2 magnetic field direction θ1-θ3 rotation angle

Claims (6)

In a wiper device that reciprocates a blade part in which a joint part serving as a fulcrum is arranged around the object to wipe off dirt on the object,
The blade part includes at least one joint part in addition to the joint part serving as the fulcrum, and a rotatable arm part that is divided by a joint part including the joint part serving as the fulcrum and has a built-in permanent magnet,
A wiper device characterized in that an electromagnet that reciprocates the blade portion by attracting or repelling the permanent magnet by reversing the polarity is disposed around the object.   The wiper device according to claim 1, wherein the rotation angle is reduced as the arm part is farther from the fulcrum of the blade part.   The wiper device according to claim 1, wherein an arm portion that is farther from a fulcrum of the blade portion is lighter.   The wiper device according to any one of claims 1 to 3, wherein a magnetic field direction of the electromagnet is inclined with respect to a surface of the object. A plurality of permanent magnets are built in the blade part,
The electromagnet is disposed at a position corresponding to the plurality of permanent magnets,
5. The wiper device according to claim 1, wherein the number of windings of the coil increases as the electromagnet is closer to the fulcrum of the blade portion. In a camera unit provided with a wiper device that reciprocates a blade part in which a joint part serving as a fulcrum is arranged around the lens of the camera to wipe away dirt on the lens or the cover glass covering the lens,
The blade part includes at least one joint part in addition to the joint part serving as the fulcrum, and a rotatable arm part that is divided by a joint part including the joint part serving as the fulcrum and has a built-in permanent magnet,
The camera unit is characterized in that an electromagnet is disposed around the lens for reversing the blade by attracting or repelling the permanent magnet by reversing the polarity.

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