JP3103270B2 - Automatic sun visor for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a light-shielding plate provided by a light-receiving sensor for detecting light reception and non-light reception when sunlight is incident on a windshield of a vehicle, for example, an automobile, and a driver or a passenger in the passenger seat feels dazzling. The present invention relates to an automatic sun visor for a vehicle that automatically controls a hammering operation.

[0002]

2. Description of the Related Art Conventionally, a vehicle, for example, an automobile is provided with a sun visor (shading plate) above a windshield. This sun visor has, for example, a mounting rod shaft penetratingly provided on one side of a main body in which a cloth is adhered to the surface of a flat wooden or hard plastic core body, and a screw is attached to one end of the mounting rod shaft. A mounting plate with holes is protruded. This sun visor is rotatably attached to a fastening metal plate with screw holes provided on the ceiling lining surface above the windshield of the automobile by aligning the screw holes in the mounting plate with screws. ing. For example, when driving a car or the like, when sunlight enters the windshield and the driver feels glare and cannot see ahead, the sun visor is rotated toward the windshield to block the incident light with the sun visor.

[0003]

The conventional sun visor for an automobile is of a manual type. That is, when the sun's incident light is dazzling, the sun visor is gripped and rotated with fingers and lowered, or when the glare is eliminated, the sun visor is gripped and rotated with fingers and raised to the ceiling. This manual operation is not annoying, and this operation while driving is dangerous. Also,
If the windshield is large like a large bus,
The driver must stand up and down each time the sun visor is raised and lowered, which is a more dangerous task. In addition, if the sun is dazzling and driving is hindered, turning the sun visor down lowers the glare, but the completely opaque sun visor goes down to the windshield side, narrowing the field of view and driving There were disadvantages such as difficulty.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and automatically adjusts a light-shielding range by automatically moving a light-shielding plate in response to glare caused by sunlight incident on a window glass of a vehicle. It is an object of the present invention to provide an automatic sun visor for a vehicle that does not narrow the front field of view in a state where the plate has eliminated the glare of sunlight.

[0005]

In order to achieve this object, an automatic sun visor for a vehicle according to the present invention has the following configuration. The automatic sun visor for a vehicle includes a case body 1 attached and fixed in place, a first light receiving sensor 2a and a second light receiving sensor 2a which are attached to the case body 1 so as to be adjustable in length, and are arranged at regular intervals in the vertical direction. A light receiving sensor 2b, a light shielding plate 3 provided inside the case body 1 so as to be able to protrude and retract, and a driving mechanism 3 for driving the light shielding plate to protrude and retract.
4, 44, 45, a motor 41 for applying a driving force to the driving mechanism, and a first for rotating the motor forward or backward in response to the light receiving or non-light receiving output of the first light receiving sensor 2a. Drive control circuits 5, 61, and 62; and second drive control circuits 5a, 6 for driving or stopping the motor in response to the output of light reception or non-light reception of the second light receiving sensor.
3, a third drive control circuit 61, 63, 71 for forcibly driving the motor in response to the non-light-receiving output of the second light-receiving sensor and the non-light-receiving output of the first light-receiving sensor. 7
2 is characterized.

In the automatic sun visor for a vehicle having such a configuration, for example, a manual sun visor mounted on an upper part of a windshield of an automobile is removed, and the sun visor is exchangeably mounted at the position. In this mounting state, the height is adjusted so that the upper second light receiving sensor is located at, for example, the driver's line of sight. That is, the adjustment is performed so that the second light receiving sensor is located on a line connecting the incident line of sunlight and the driver's eyes. When both the lower first light receiving sensor and the upper second light receiving sensor receive sunlight, the first drive control circuit causes the motor to rotate forward in response to the received light output,
Drive control circuit drives the motor, and the motor is driven to rotate forward. As a result, the light shielding plate projects outward from the case body and moves forward. Then, the sunlight is blocked by the protruding light shielding plate, the upper second light receiving sensor stops receiving light, and the non-light receiving output causes the second drive control circuit to stop the motor and stop the light shielding plate at that position. As a result, the driver is not dazzled. In this state, for example, when the vehicle runs on an uphill, the line of sight becomes relatively low with respect to the light shielding plate, and sunlight also enters the second light receiving sensor again,
The second drive control circuit drives the motor in response to the received light output, and further moves the light shielding plate forward so as to project outward. When sunlight is blocked by the protruding light-shielding plate, the second light-receiving sensor stops receiving light in the same manner as described above, and the non-light-receiving output causes the second drive control circuit to stop the motor so that the light-shielding plate is moved to that position. Stop. As a result, the driver is not dazzled.

On the other hand, in the state where the light-shielding plate is protruded, the first light-receiving sensor and the second light-receiving sensor are changed due to a change in the external environment, for example, when a vehicle enters a tunnel, or when the vehicle goes downhill from a flat ground. When both sensors stop receiving light, the third drive control circuit forcibly drives the motor in response. In addition, the first drive control circuit reverses the motor in response to the non-light-receiving output of the first light-receiving sensor, so that the motor is driven in the reverse direction. As a result, the light shielding plate is retracted toward the case body. When the light-shielding plate retreats to a position where the first light-receiving sensor receives sunlight, the third drive control circuit stops the motor by the light-receiving output of the first light-receiving sensor, and the light-shielding plate stops at that position. . As a result, the driver is still not dazzled.

[0008]

FIG. 1 is a perspective view showing a specific embodiment of an automatic sun visor for a vehicle according to the present invention.

An automatic sun visor for a vehicle includes a case body 1
And a sensor case 2 mounted and arranged on the case body 1
And a light-shielding plate 3 which can be provided and retracted in the case body 1 and
It comprises a drive mechanism 4 for moving the light-shielding plate 3 in and out, and control means for controlling the drive of the drive mechanism.

The case body 1 includes a rectangular flat substrate 11,
It comprises a frame edge 12 provided on the outer peripheral edge of the substrate 11 and a rectangular flat cover plate 13. The substrate 11 and the lid plate 13 are, for example, AB
Molded with S resin. The plan view of FIG. 2 shows a state where the cover plate 13 is removed. The frame edge portion 12 is formed by, for example, aluminum drawing, and has one end portion 12a and the other end portion 12b facing each other, a front side portion 12c, and a rear side portion 12d.
And formed in a rectangular frame body having a planar shape. In the center of the length of both sides 12c, 12d, a bearing 12e,
12e is provided. Protruding pieces 12f are provided at both ends 12a and 12b so as to protrude a predetermined length inward, and a guide groove 12g into which a light shielding plate 3 described later is fitted is provided between the protruding pieces 12f and the substrate 11. I have. Also,
A first limit switch 71 to be described later is mounted on the rear side of the one end 12b, and a second limit switch 72 is mounted on the front side. Further, a first relay 61, which will be described later, is provided in the rear surface of the substrate 11 (side portion 12d).
The second relay 62 and the third relay 63 are provided, and the forward / reverse rotation motor 41 and the first switch 5 and the second switch 5a are attached and provided, respectively. In addition, a sensor case 2 described later is mounted on the front side of the other end 12a via a mounting plate 12h.

As shown in FIG. 1, a mounting body 14 is fixed to the substrate 11. The mounting body 14 includes two fixing plates 14a, 14a, and a through hole 14 of the fixing plate 14a.
and a mounting plate 14d fixed to one end of the rod shaft 14c. Fixing plate 1
4a, 14a are screw-fastened so as to face both ends of the substrate 11, respectively, and the rod shaft 14c penetrating through the fixing plates 14a, 14a is rotatably fastened with the fastening screws 14f of the fixing plate 14a.
It is fixed in. A long hole 14e is opened in the plane of the mounting plate 14d. When the case body (substrate 11) 1 is attached to, for example, an upper part of a windshield of an automobile by the fixing plate 14a, the rear side of the case body 1 contacts the lining surface of the ceiling, and the front side (the doorway side of the light shielding plate 3) is forward. It becomes inclined in the direction.

As shown in FIG. 3, a through-hole 13a is formed in the cover plate 13 so as to allow a rotating portion 23 and a vertical support 24 of the sensor case 2 to be described later to pass therethrough. The through-hole 13 a allows the rotating part 23 and the vertical support 24 of the sensor case 2 to protrude outside the lid 13, and the sensor case 2 can be raised and lowered with respect to the lid plate (case body 1) 13.

The light shielding plate 3 is provided with the two guide grooves 12g.
It may be an opaque plastic plate or a metal plate such as aluminum, which is a rectangular flat plate having a size that fits into a rectangular plate. In the embodiment, a dark-colored transparent (so-called translucent) such as an acrylic resin plate, a polycarbonate, an ABS resin plate, etc. ) Is formed of a plastic plate. In other words, when the sunlight is blocked, the driver's eyes are in a shadow state, and the eyes looking forward are made of dark transparent plates that can block light as if they were wearing dark sunglasses as if they were wearing dark sunglasses. You. The base end side of the light shielding plate 3 is connected to a first relay 6 mounted on the substrate 11.
1, second relay 62, third relay 63, motor 4
A notch 31 corresponding to the first switch 5, the first switch 5, and the second switch 5a is provided (see the phantom line of the light shielding plate 3 in FIG. 2). A limit switch operating block 32 is attached to one end of the light shielding plate 3 on the base end side. When the light shielding plate 3 is completely housed in the case main body 1, the operation block is closed. The operation block 32 pushes and turns off the second limit switch 72 when the light-shielding plate 3 protrudes the maximum length from the case main body 1 while the first limit switch 71 is pressed and turned off by the first limit switch 71. Is set to Further, when the light-shielding plate 3 is completely housed in the case main body 1, a tip slightly protruding outward is a bent portion 33, and when the light-shielding plate 3 protrudes outward from the case main body 1, this bending is performed. Part 33
Are set to be in a vertical state (see FIG. 1). A connecting member 34 is attached to the light shielding plate 3 as shown in FIG. The connecting member 34 is for attaching to a movable nut (screw block) 45 that is screwed to a screw shaft 44 described later. The connecting member 34 is a rectangular parallelepiped with a through hole 34a having a large diameter at one end and a small diameter at the other end. A spring 34b is provided on the large diameter side, and a screw is attached to a flange 45a of a movable nut 45 described later. I have attached. Accordingly, when the light shielding plate 3 slides in and out of the guide groove portion 12e, even if a slight inclination with respect to the guide groove portion 12e occurs, the coupling member 34 absorbs the light shielding plate 3 so that the light shielding plate 3 can smoothly move forward and backward. Is possible.

As shown in FIG. 2, the drive mechanism 4 includes a forward / reverse rotation motor 41, a gear (counter gear) 43 attached to a rotation shaft 42 of the motor 41, a bearing 12e of the frame edge 12, It comprises a screw shaft 44 with a gear 44a which is supported by the shaft 12e, and a movable nut (screw block) 45 screwed to the screw shaft 44. This small motor 41 is
A 12V specification is used, and for example, a cigarette lighter power supply (12V) of an automobile is used. Although not shown, when the power supply of the automobile is 24 V (for example, a diesel car), it can be used by using a constant voltage circuit. The forward / reverse rotation of the motor 41 causes the screw shaft 44 to rotate forward / reverse, and the movable nut 45 reciprocates on the screw shaft 44. That is, the light shielding plate 3 reciprocates via the connecting member 34.

FIG. 3 is a perspective view showing the sensor case 2. The sensor case 2 includes a sensor housing box 21 and a telescopic tube 22. Inside the box 21, there is a lower first light receiving sensor 2a located below when the sensor case 2 is in a vertical state with respect to the sensor case (cover plate 13) 1.
And the upper second light receiving sensor 2b are arranged in a vertical direction at a predetermined interval. The telescopic tube 22 includes an upper small-diameter tube portion 22a and a lower large-diameter tube portion 22b. The small-diameter tube portion 22a is fitted to the large-diameter tube portion 22b, and is set so as to be able to protrude and retract for a predetermined length. The distal end of the small-diameter tube 22 b is fixed to the lower end of the sensor box 21, and the lower end of the large-diameter tube 22 b is fixed to the rotating part 23. This rotating part 23 is
It is rotatably mounted on a vertical mounting plate 24 that rises from a mounting plate 12h mounted on the substrate (frame edge 12a) 11. Therefore, the projecting length of the sensor case (sensor housing box 21) 2 can be adjusted by the telescopic tube 22, and the height position of the upper second light receiving sensor 2b can be adjusted, for example, to the line of sight of the driving vehicle. That is, the adjustment can be performed so that the second light receiving sensor 2b is located on a line connecting the incident line of sunlight and the driver's eyes. The light receiving sensors 2a and 2b use phototransistors in the embodiment. The lower first light receiving sensor 2a and the upper second light receiving sensor 2b are both protrudingly provided at positions recessed inward from the front surface of the sensor storage box 21,
It is set not to receive light in the horizontal direction.

FIG. 4 is a circuit diagram showing an electric circuit of the automatic sun visor for a vehicle according to the embodiment. The first light receiving sensor 2a includes:
The emitter is connected to the ground G via the variable resistor VRa, and the collector is connected to the positive electrode of the power battery E. A circuit in which a parallel circuit of a relay coil of each of the first relay 61 and the second relay 62 and a diode 81 are connected in parallel between the positive electrode of the power supply battery E and the ground G; Sa common terminal,
out terminal and first transistor (first switch)
5 circuits connected in series are connected. The base of the first transistor 5 is connected to a connection point between the emitter of the first light receiving element 2a and the variable resistor VRa.

The common terminal COM of the first relay 61 is connected to the ground G, the normally closed contact Nc is connected to the common terminal of the automatic / manual changeover switch Sc, and the normally open contact No is connected to the second transistor (the second transistor). Switch) 5a. The second relay 62 has two switching circuits. The common terminal COM1 is connected to the normally open terminal No of the third relay 63, and the normally closed terminal Nc corresponding to the common terminal COM1 is connected to the ground G. It is connected. The normally open terminal No is connected to the positive electrode side of the power battery E. Further, the common terminal COM2 is connected to the motor 4
1, a normally closed terminal Nc corresponding to the common terminal COM2 is connected to the positive electrode side of the power supply battery E, and a normally open terminal No is connected to the ground G.

A variable resistor VRb is connected between the base and the emitter of the second transistor 5a, the base is connected to the emitter of the second light receiving sensor 2b, and the collector of the second light receiving sensor 2b is connected to the power supply battery E. Is connected to the positive electrode side. Also, a parallel circuit of a relay coil of the third relay 63 and a diode 81, a second limit switch 71, and a common terminal of an automatic-manual switch Sb are provided between the positive electrode of the power supply battery E and the collector of the second transistor 5a. ,
The series circuit of the out terminal is connected. The common terminal COM of the third relay 63 is connected to the other end of the motor 41, the normally closed terminal Nc is connected to one end of the motor 41, and the normally open terminal No is the second relay as described above. It is connected to 62 common terminals COM1. A first limit switch 71 is connected between the common terminal of the automatic / manual switch Sb and the out terminal of the automatic / manual switch Sc. Automatic-manual switch S
a and the manual terminal of Sb are connected in common,
The both terminals of the push button switch 1 are connected to the normal terminal and the ground G, respectively, and both terminals of the push button switch 2 are connected to the out terminal and the manual terminal of the automatic / manual changeover switch Sc, respectively. The negative electrode side of the power battery E is grounded.

Next, the operation of the electric circuit of this embodiment will be described. First, the automatic-manual changeover switches Sa, Sb, Sc
Will be described. Also,
It is assumed that the light shielding plate 3 is housed in the case body 1.
When light enters from outside in such a state, both the lower first light receiving sensor 2a and the upper second light receiving sensor 2b receive light. The first light receiving sensor 2a is for instructing the light shielding plate 3 to appear and disappear, and instructs "out" when light is received and "in" when light is not received. When the first light receiving sensor 2a receives light, a light receiving current flows through the light receiving sensor 2a, and this current flows through the variable resistor VRa. Therefore, the base potential of the first transistor 5 increases, and the first transistor 5 turns on. 1
Relay 61 is turned on. That is, the common terminal COM is connected to the normally open terminal No. As a result, the emitter of the second transistor 5a is connected to the ground, and a state where a light receiving current can flow to the second light receiving sensor 2b is established. Light shield plate 3
However, when completely stored in the main body case 1, the second light receiving sensor 2b also receives external light, and a light receiving current flows. Thus, the base potential of the second transistor 5a rises and turns on. When the light shielding plate 3 is completely housed, the second limit switch 72 is in the ON state. Therefore, the relay coil of the third relay 63, the second
Current flows through the path of the limit switch 72 and the second transistor 5a, and the third relay 63 is turned on. on the other hand,
Since the second relay 62 is also turned on at the same time when the first relay 61 is turned on, the power is supplied from the power supply battery E from the other end to the one end of the motor 41, and the motor is driven to rotate in the normal direction. . As a result, the light blocking plate 3 moves forward.

Eventually, when the tip of the light-shielding plate 3 comes down to the line of sight and slightly lower than the line of sight, no light enters the second light receiving sensor 2b. Second light receiving sensor 2
When b does not receive light, current stops flowing. Therefore, the second
, The base potential of the transistor 5a drops, and the second transistor 5a turns off. Therefore, the third relay 63
Turns off. When the third relay 63 is turned off, the motor 4
Both ends of 1 are short-circuited, and the motor 41 stops. When the vehicle is traveling on a flat road with a horizontal surface, the light blocking plate 3 functions as a sun visor while being stopped at that position. When the road goes uphill, the line of sight becomes relatively lower than the tip of the light shielding plate 3, and when sunlight enters the driver's eyes, light enters the second light receiving sensor 2b and the second light receiving sensor 2b. 2b
And the second transistor 5a is turned on,
The third relay 63 is turned on, the motor 41 is driven to rotate forward again, and the light-shielding plate 3 moves forward further from that position. Then, when the light does not enter the second light receiving sensor 2b, the second transistor 5a is turned off and the third relay 63 is turned off in the same manner as described above, so that the motor 41 is stopped, and the light shielding plate 3 is moved to its position. Stop at

When the road surface is going downhill from a horizontal state,
Alternatively, when returning to a horizontal road surface from an uphill, the line of sight becomes relatively higher than the tip of the light shielding plate 3, and the light shielding plate 3 blocks the front of the driver. At this time, sunlight to the first light receiving sensor 2a is also blocked by the light shielding plate 3, and the first light receiving sensor 2a also does not receive light. First light receiving sensor 2a
When the light receiving current stops flowing, the first transistor 5 is turned off, and the first relay 61 and the second relay 62 are turned off. Thereby, the first relay 61, the second relay 6
2 common terminals COM, COM1, COM2 are connected to the normally closed terminal Nc, respectively. Here, since the first limit switch 71 and the second limit switch 72 are both ON, the relay coil of the third relay, the second limit switch 72, and the first limit switch 71 are supplied from the power supply battery E. Au of the automatic-manual changeover switch Sc
A current flows through a path of the t terminal, the common terminal COM, the normally closed terminal Nc of the first relay 61, the common terminal COM, and the ground G, the third relay 63 is turned on, the motor 41 is driven, and the Since the second relay 62 is in the off state, the normally closed terminal Nc on the second circuit side of the second relay 62, the common terminal COM2, the motor 41,
The common terminal COM of the third relay 63, the normally open terminal No.
Common terminal COM on the first circuit side of second relay 62
1. A current flows through the path of the normally closed terminal Nc and the ground G, and the motor 41 rotates in the reverse direction. Therefore, the stopped light shielding plate 3 starts to reverse (retreat). When the tip of the light-shielding plate 3 returns close to the line of sight, sunlight enters the first light receiving sensor 2a. As a result, the first transistor 5 turns on,
The first relay 61 and the second relay 62 are turned on. As a result, the common terminal COM of the first relay 61 is connected to the normally open terminal No, the normally closed terminal Nc is opened, and the relay coil of the third relay 63, the second limit switch 72, the first limit The current path through the switch 71 is disconnected, and the third relay 63 is turned off. Then, since the motor 41 stops, the light shielding plate 3 also stops at that position.

For some reason, the first light receiving sensor 2
a, if the second light receiving sensor 2b is in a light receiving state, the first relay 61, the second relay 62, and the third relay 63 are all turned on, the motor 41 is driven to rotate forward, and the light shielding plate 3 will continue to move forward. When the light shielding plate 3 projects to the maximum length, the second limit switch 72 is turned off by the light shielding plate 3, the third relay 63 is turned off, and the light shielding plate 3 stops. Also, for some reason (for example, when entering a tunnel), the first
If both the light receiving sensor 2a and the second light receiving sensor 2b are continued in the non-light receiving state, the motor 41 is in the reverse drive state and the light shielding plate 3 continues to move backward. When the light shielding plate 3 is completely housed in the case body 1, the first limit switch 71 is turned off by the light shielding plate 3, the third relay 63 is turned off, the motor 41 is stopped, and the light shielding plate 3 is also stopped. I do.

Set the automatic / manual switch to manual
When switching to the (manual) side, the changeover switches Sa, S
Each of the common terminals b and Sc is continuously connected to the manual terminal. In this state, the light-shielding plate 3 can be stopped at any position regardless of the light-receiving signals of the light-receiving sensors 2a and 2b. That is, the auto-manual changeover switch is set to “manual”, and while the push button 1 is kept pressed, the light shielding plate 3 protrudes and the second limit switch 7
It is possible to protrude to two positions. In addition, while the push button 2 is kept pressed, the light blocking plate 3 retreats toward the case body 1 and can retreat to the first limit switch 71 position. When the push operation of the push button 1 or the push button 2 is released, the light blocking plate 3 stops at that position. Therefore, it can be stopped at an arbitrary position.

In FIGS. 2 and 4, three diodes 8 are used.
Numeral 1 is for preventing back electromotive force and for protecting the transistors 5 and 5a.
a, 2b for adjusting the light receiving sensitivity.

The automatic sun visor for a vehicle having such a configuration is mounted on an upper part of a windshield of an automobile, for example, as follows. As shown in FIG. 5, a mounting metal plate B having a screw hole and a hook H are provided in a ceiling lining above a windshield A of an automobile. Then, the mounting plate D of the manual sun visor (shading plate) C is screwed together with the mounting plate D of the automobile in a state of being in contact with the mounting metal plate B of the vehicle. Therefore, the manual sun visor C can be removed by removing the screw (FIG. 5 shows a state in which the manual sun visor mounted on the automobile is removed).
Therefore, the mounting plate 14d of the automatic sun visor of the embodiment is brought into contact with the mounting metal plate B of the vehicle, and the screw can be easily mounted by screwing the removed screw into the long hole 14e.

In this mounted state, the sensor case 2
Is adjusted by extending and retracting the extension 22 so that the upper second light receiving sensor 2a is located slightly below the driver's line of sight. That is, for example, according to the height of the driver's sitting height, the upper second line is drawn on a line connecting the sunlight incident line and the driver's line of sight.
The length is adjusted so that the light receiving sensor 2b is positioned (see FIG. 6). In addition, the power supply uses a cigarette lighter socket of a car. Now, as shown in FIG. 7, sunlight enters the windshield, and the upper second light receiving sensor 2b,
Assuming that both of the lower first light receiving sensors 2a receive light, the first switch 5 is turned on and the first relay 61 is turned on in response to the first light receiving signal. Thereby, the second
Is switched so that the light receiving sensor 2a and the second limit switch 72 operate. Further, the second switch 5a is turned on by the light reception of the second light receiving sensor 2b, and the third relay 63
Is turned on, and the motor 41 is driven to rotate forward. As a result, the screw shaft 44 rotates forward, and the movable nut (screw block) 45 screwed to the screw shaft 44 moves forward toward the opening / entrance side of the case body 1. Go outside. When the light-shielding plate 3 comes out of the case main body 1, the operation block 32 of the light-shielding plate 3 is separated from the first limit switch 71, so that the first limit switch 7
1 is turned on.

The light-shielding plate 3 comes out of the case body 1 and
When the distal end portion 33 of the light-shielding plate 3 is positioned in front of the upper second light receiving sensor 2b, that is, when the light-shielding plate 3 protrudes and descends to the “X” position as shown by the nest 7, the sunlight is blocked. The light receiving sensor 2b stops receiving light. As a result, the second switch 5a is turned off, and the third relay 63 is turned off, so that the motor 41 stops, and the light shielding plate 3 stops at that position ("X" position). In this state, sunlight incident on the windshield is blocked by the light-shielding plate 3, and the line of sight becomes a shadow state, thereby eliminating glare. The light-shielding plate 3 is a dark-colored transparent plate (so-called translucent) capable of shielding light, and does not narrow the field of view in front.

When the incident angle of sunlight changes, for example, as a result of the change of the incident angle due to a change in the road surface environment such as an uphill,
If the sunlight again enters the eyes and becomes dazzling, the upper second light receiving sensor 2b receives light (the lower first light receiving sensor a naturally also receives light). As a master, the second switch 5a is turned on again, the third relay 63 is turned on, and the motor 41 is driven forward. As a result, the light shielding plate 3 further protrudes outward until the second light receiving sensor 2b stops receiving light (the light shielding plate 3 shown in FIG. 7 is at the "Y" position) and stops at the "Y" position.

Assuming that the light shielding plate 3 protrudes the maximum length from the case body 1, the operation block 32 of the light shielding plate 3 pushes the second limit switch 72, and the second limit switch 72 is turned off. Thereby, the third relay 63
Is turned off, the motor 41 stops, and the light-shielding plate 3 stops in a state in which the light-shielding plate 3 has moved forward by the maximum length.

On the other hand, as a result of a change in the incident angle of sunlight with respect to the windshield, for example, a change in the road surface environment due to a downhill or the like, both the upper second light receiving sensor 2b and the lower first light receiving sensor 2a are changed. When no light is received, the first switch 5 is turned off, the first relay 61 is turned off, and the first switch 5 is turned off.
Current flows through the relay coil of the third relay 63 through the milit switch 71 and the second limit switch 72,
The third relay 63 is turned on, and the motor 41 is driven.
At the same time, since the second relay 62 is off, the motor 41 is switched to the reverse rotation, the motor 41 is driven to rotate in the reverse direction, and the light shielding plate 3 moves backward to the case body 1 side. Assuming that the lower first light receiving sensor 2a receives light due to a change in the road surface environment or the like while the light shielding plate 3 is retreating,
As shown in FIG. 7, the retreat of the light shielding plate 3 stops at the "Z" position. That is, in a state where the lower first light receiving sensor 2a receives light and the upper second light receiving sensor 2b does not receive light, the first
Is turned on, the second switch 5a is off, the third relay 63 is off, and the motor 41
Stops. Therefore, the light blocking plate 3 stops at the “Z” position.

On the other hand, the cause of the retreat of the light shielding plate 3 is, for example, when the car turns right or left with respect to the incident direction of the sunlight, or when the sunlight does not reach the windshield of the car at all due to the surrounding buildings. Alternatively, when the first and second light receiving sensors 2a and 2b stop receiving light, for example, when a car enters a tunnel, the first switch 5 and the second switch 5
a is turned off. Then, the first relay 61 is turned off, the current is switched through the first limit switch 71 and the second limit switch 72 through the relay coil of the third relay 63, and the second relay 62 is turned off. Then, the reverse rotation of the motor 41 is switched. Since the light shielding plate 3 is protruding and the first limit switch 71 and the second limit switch 72 are in the ON state, the third
Is turned on, the motor 41 is driven to rotate in the reverse direction,
The light shielding pair 3 retreats to the case body 1 side. During this retreat, if the first light receiving sensor 2a does not receive light forever, the light shielding plate 3 is completely immersed in the case body 1. Here, when the operation block 32 of the light shielding plate 3 presses the first limit switch 71 and the first limit switch 71 is turned off, the third relay 63 is turned off and the motor 41 is stopped. It is stopped and held in a state where it is completely housed in the case body 1.

In the above embodiment, the limit switch is used to detect the state in which the light shielding plate 3 is completely housed in the case body 1 and the state in which the light shielding plate 3 protrudes the longest. A photoelectric switch may be used. Further, in the embodiment, the automatic sun visor (the case body 1) is mounted on the mounting metal plate for the sunshade plate on the upper part of the windshield of the vehicle. However, in the embodiment, the case body is mounted inside the lining surface of the ceiling of the vehicle. 1 may be arranged in an interior shape, and in this case, only the light-shielding plate 3 that protrudes and retracts in the direction of the windshield can be viewed. Further, in the embodiment, an example is shown in which the automatic sun visor is provided corresponding to the windshield of the vehicle. However, in practice, the automatic sun visor may be provided on the rear window side of the vehicle or the like. In this case, the case main body 1 is provided on the back side of the rear seat, and the light shielding plate 3 is moved up and down from the rear window with respect to the rear window.

[0033]

As described above, according to the present invention, two light-receiving sensors are disposed vertically between the eyes of the occupant (driver) and the direct sunlight (incident light) incident on the windshield. And, the upper second light receiving sensor is located in front of the occupant's eye, while the light shielding plate is made to protrude and retract in front of the light receiving sensor. , It can be controlled to always be in the shadow state. Therefore,
The anti-glare effect of the occupant is realized while securing a large front view. In addition, direct sunlight from the sun incident on the windshield,
The sensor case disposed between the occupant's eyes and the occupant's eyes can be adjusted in height so that when direct sunlight from the occupant's eyes enters the upper second light receiving sensor. That is, the second light receiving sensor and the eyes of the occupant can be adjusted to be at the same point (position where the incident light, the second light receiving sensor, and the eyes of the occupant are aligned on a straight line) as viewed from the direct light. Accordingly, the height position of the second light-receiving sensor can always match the eye height position of the occupant's sitting posture regardless of the height of the eyes or the eye height position that differs for each occupant due to the driving posture. . Therefore,
Irrespective of physique and sitting posture, the shadow state can be accurately made even slightly below the eyes of the occupant. In addition, the light receiving surface of the sensor case, which hangs substantially perpendicularly to the case main body, normally faces forward of the vehicle. However, at night or in a tunnel, the sensor case can be folded down so as to be in contact with the case main body to form a superposed state, so that light from the front of the vehicle body cannot be received. Thereby, it is possible to prevent a malfunction such as receiving the headlight of the oncoming vehicle and projecting the light shielding plate, narrowing the field of view and causing a dangerous state. Furthermore, the height of the sensor case that hangs substantially perpendicularly to the case body can be adjusted, and the height position of the light receiving surface of the sensor is held immovable regardless of the moving state of the light shielding plate. Therefore, when traveling toward the sun, there is a case where a shadow area formed below a sensor position (sensor accommodation box) is a shadow area and a solar area is formed above the sensor due to a shadow formed by a truck running ahead. Even in such a case, as long as the occupant's eyes are in the shadow state, the state in which the light shielding plate is immersed in the case main body is ensured, and safe operation can be realized without causing a malfunction such as accidentally advancing the light shielding plate. .
In addition, the case main body can be exchangeably mounted on an existing manually-rotatable sunshade installed on the vehicle, and the mounting operation is extremely easy. Furthermore, the light-shielding plate is a dark-colored transparent plate capable of blocking light, and has excellent effects of achieving the object of the invention, such as good visibility and easy driving because it only eliminates glare and does not narrow the field of view in front. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing an automatic sun visor for a vehicle according to an embodiment.

FIG. 2 is a plan view showing a state where a cover plate of the automatic sun visor for a vehicle is removed.

FIG. 3 is a perspective view showing a state where a sensor case protrudes from a lid plate.

FIG. 4 is an electric circuit diagram showing a circuit configuration example of an automatic sun visor for a vehicle according to an embodiment.

FIG. 5 is an explanatory diagram showing a state in which the automatic sun visor for a vehicle is mounted on an upper part of a windshield of an automobile.

FIG. 6 is an explanatory view showing a state in which the automatic sun visor for a vehicle is mounted on an automobile.

FIG. 7 is an explanatory diagram illustrating a light blocking state of the automatic sun visor for a vehicle according to the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 case main body 2 sensor case 3 light shielding plate 4 drive mechanism 2a first light receiving sensor 2b second light receiving sensor 5 first switch 5a second switch 41 motor 61 first relay 62 second relay 63 third Relay 71 First limit switch 72 Second limit switch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-284413 (JP, A) JP-A-48-16327 (JP, A) JP-A 5-35494 (JP, U) JP-A 4-35494 118806 (JP, U) Fully open 58-47513 (JP, U) Fully open 2-71021 (JP, U) Fully open 46-115715 (JP, U) Fully open, 56-148923 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B60J 3/02

Claims (3)

(57) [Claims] The present invention comprises a case body, a rotating portion provided on a lower surface of the case body, a telescoping portion having a base end fixed to the turning portion, and a sensor housing box fixed to a distal end of the telescoping portion. The sensor housing box includes an upper second light receiving sensor and a lower first light receiving sensor that is opened at a certain distance from the second light receiving sensor, and the second light receiving sensor is in a second position when sunlight enters the occupant's eyes. And the height of the second light receiving sensor can be adjusted so that the light does not enter the second light receiving sensor when the light is not incident on the eyes of the occupant. A case, a light shielding plate provided in the case main body and capable of protruding and retracting in front of the sensor case, a driving mechanism for driving the projection and retraction of the light shielding plate, a motor for applying a driving force to the driving mechanism, Sunlight enters the light receiving sensor In this case, sunlight is also incident on the lower first light receiving sensor, whereby the motor is driven to rotate forward in response to the light receiving signals output by the first light receiving sensor and the second light receiving sensor, thereby blocking light. When the plate is advanced, and the upper second light receiving sensor is shielded by the advancing light shielding plate,
In response to the non-light-receiving signal of the second light-receiving sensor and the light-receiving output of the first light-receiving sensor, the motor is stopped to stop the light shielding plate at the protruding position, while responding to the non-light-receiving output of the first light-receiving sensor. And a drive control circuit for controlling the motor to rotate in the reverse direction and retract the light shielding plate. 2. The automatic sun visor for a vehicle according to claim 1, wherein the case main body is mounted at a sun visor mounting position provided above a windshield of an automobile. 3. The automatic sun visor for a vehicle according to claim 1, wherein said light shielding plate is a dark transparent plastic plate capable of shielding light.