JPH0741813U - Drive control device for optical member for controlling light distribution in variable light distribution headlight - Google Patents

Abstract

(57) [Summary] [Object] To provide a drive control device of an optical member for controlling light distribution in a variable light distribution type headlamp having a simple structure. A forward / reverse rotational force of a motor M is transmitted to a light distribution control optical member (mirror) 32 via a power transmission mechanism (mirror rotation mechanism) 35 including a plurality of power transmission members, and a light distribution control optical element. It is a drive control device for a light distribution control optical member in a variable light distribution headlight in which the light distribution is switched in two stages by the member (mirror) 32 selectively taking two different positions with respect to the light source 23. The mechanical transmission means (the long hole 46a of the stopper plate 46), the power transmission mechanism 35
Between the power transmission member (pin) 42a and the output shaft of the motor M, which is stopped by the stopper means (elongate hole 46a) while the power transmission member (pin) 42a, which is a component of the above, is stopped at a predetermined position. In addition, a torque limiter 43 that idles when the turning torque exceeds a predetermined value is provided to prevent an excessive load from acting on the motor M.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 In the present invention, the forward and reverse rotations of the motor are transmitted to the light distribution control optical member via the power transmission mechanism, and the light distribution control optical member displaces its position to switch the light distribution to two stages. The present invention relates to a drive control device for a light distribution control optical member in a variable light headlight.

[0002]

[Prior art]

 As a conventional technique of this type, there is Japanese Utility Model Laid-Open No. 63-102106. As shown in FIG. 16, a front lens 3 is attached to a front opening of a lamp body 1 having a parabolic reflector 2 formed on its inner peripheral surface to form a lamp chamber. A headlamp having a structure in which a light source 4 is housed in a lamp chamber, in which a vertically long rectangular reflector 5 which can be rotated around a vertical support shaft 6 is arranged in parallel inside the lens 3. Is disclosed.

Then, the reflection plate 5 is rotated about the vertical support shaft 6 so that the reflection plate 5 is parallel to the optical axis and the reflection plate 5 is inclined with respect to the optical axis, and the light distribution is different. I can do it. That is, in the form in which the reflecting plate 5 opens the optical path as shown by the imaginary line, the light on the optical path passes between the reflecting plates 5 and 5 and is guided forward without being reflected by the reflecting plate 5 and the front lens 3 A predetermined light distribution is formed by the light distribution control step 3a formed on the back surface. On the other hand, when the reflection plate 5 is rotated around the vertical support shaft 6 so that the reflection plate 5 is inclined by a predetermined angle with respect to the optical axis L as shown by the solid line, part of the light is reflected by the reflection plate 5. , A light distribution diffused to the left and right is formed.

Further, as a means for rotating the reflection plate 5, there is, for example, a link type reflection plate rotation mechanism, and a drive control device of this rotation mechanism drives the rotation mechanism as shown in FIG. Structure including drive motor M _{1 for} moving, positioning sensor 7 for detecting the position of reflector 5, controller 8 for controlling drive of drive motor M ₁ based on position detection information from positioning sensor 7 Thus, so-called binary control is performed in which the reflector rotating mechanism is rotationally controlled so that the reflector 5 has a first position parallel to the optical axis and a second position inclined with respect to the optical axis. It was Reference numeral 9 is a control switch for setting conditions such as the tilt angle of the reflector 5 in the controller 8.

[0005]

[Problems to be solved by the device]

 However, since the drive control device described above includes the positioning sensor 7 and the controller 8, accurate position control of the reflection plate is possible, but these are expensive as parts and the cost of the entire device is high. was there. Further, since the positioning sensor 7 and the controller 8 are provided, the structure of the entire apparatus is complicated, and the number of constituent parts is large, which causes a problem of heavy weight.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a drive control device of a light distribution control optical member in a variable light distribution headlamp having a simple structure. .

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, in a drive control device for a light distribution control optical member in a variable light distribution headlamp according to the present invention, a forward and reverse rotational force of a motor is transmitted by a plurality of power transmission members. It is transmitted to the light distribution control optical member via the mechanism, and the light distribution control optical member selectively takes two different positions with respect to the light source, so that the light distribution is switched in two stages. In a drive control device for a light distribution control optical member in a mold headlight, a means for locating the light distribution control optical member at two different predetermined positions is brought into contact with a power transmission member constituting the power transmission mechanism. Mechanical stopper means for stopping the lever power transmission member at a predetermined position is provided, and the turning torque between the power transmission member stopped by the stopper means and the output shaft of the motor becomes a predetermined value or more. Tato It is equipped with a torque limiter that rotates freely.

[0008]

[Action]

 The mechanical stopper means forcibly stops the operation of the power transmission member in the power transmission mechanism at a predetermined position in the operation direction, and the light distribution control optical member linked with the power transmission member is moved to a predetermined first position or second position. Position. Also, as the operation of the power transmission member that constitutes the power transmission mechanism is forcibly stopped, an excessive load will be transmitted to the output shaft side of the motor, but it was stopped by the stopper means. The torque limiter provided on the torque transmission path between the power transmission member and the motor output shaft idles to absorb this excessive load.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 10 show an embodiment in which the present invention is applied to a variable light distribution mechanism of a fog lamp for an automobile, FIG. 1 is a front view of a fog lamp which is a first embodiment of the present invention, and FIG. 2 is the same lamp. Is a horizontal sectional view (a sectional view taken along line II-II shown in FIG. 1), FIG. 3 is a longitudinal sectional view of the same lamp (a sectional view taken along line III-III shown in FIG. 1), and FIG. FIG. 5 is an exploded perspective view of the mechanism, FIG. 5 is an enlarged perspective view of the periphery of the stopper plate, FIG. 6 is an explanatory diagram for explaining the action of the center over spring, FIG. 7 is an enlarged perspective view of a light distribution control mirror, and FIG. 8 is a mirror surface. FIG. 9 is an explanatory view for explaining the action of a diffusion step which is a light distribution control step formed in FIG. 9, FIG. 9 is a block diagram of a drive control device of a light distribution variable mechanism, and FIG. 10 is a view showing a light distribution pattern created by a fog lamp. is there.

In these drawings, reference numeral 10 is a container-shaped lamp body of a fog lamp for an automobile, and a transparent front cover 12 is attached to a front opening portion of the lamp body 10 to form a lamp chamber. In addition, the projection type lamp body 20 is supported by an aiming mechanism (not shown) so as to be tiltable. The lamp body 20 is integrated with the light projection unit 21 which is a parallel light forming means in front of the light projection unit 21, and is a light distribution for diffusing the light emitted from the light projection unit 21 in a predetermined direction. It is composed of a control device 30.

The light projection unit 21 converts a substantially ellipsoidal reflector 22, a bulb 23, which is a light source arranged at the first focal point of the reflector 22, and a light reflected by the reflector 22, into substantially parallel light. It is composed of a projection lens 24 that projects and distributes light forward, and a shade 25 for forming a clear cut line, which is the second focus of the reflector 22 and is arranged at the focal position of the projection lens 24. Reference numeral 26 is a cylindrical lens holder for fixing and integrally projecting the projection lens 24 to the reflector 22, and the shade 25 is formed integrally with this lens holder 26. The symbol L indicates the optical axis of the light projection unit 21.

The variable light distribution mechanism 30 has a structure in which a mirror 32, which is a thin plate-shaped light distribution control optical member having a vertically long rectangular shape in a front view, is arranged in parallel in a left-right direction in a front rectangular frame body 31. Each mirror 32 can be rotated forward and backward around a vertical support shaft 36 by a link type mirror rotation mechanism 35. Reference numeral 31a is an opening of the frame body 31. The reference numeral 37 designates a pair of upper and lower rod-shaped fixed bearings fixed to the frame body 31 and extending in the left and right direction to support a pair of upper and lower vertical support shafts 36 projecting at the side edge extension positions on the front end side of the mirror 32. Is a pair of upper and lower rod-shaped movable bearings extending in the left and right direction, which support a pair of upper and lower vertical support shafts 38 protruding from the rear edge side of the mirror 32, and the movable bearing 39 is connected via a link 40. The motor M is pin-connected to the oscillating plate 41 that rotates forward and backward. Reference numeral 42 a indicates a connecting pin vertically provided on the surface of the swing plate 41.

The oscillating plate 41 is connected to the output shaft of a rotary damper 43, which is a torque milter that absorbs the rotational torque when it exceeds a predetermined value and does not cause an excessive load on the input shaft side. The input shaft of 43 is linked to the output shaft of the motor M via a reduction gear mechanism 45 including a spur gear 45a and a pinion 45b. Reference numeral 44 is a coupling. When the motor M rotates in the normal and reverse directions, the rocking plate 41 rotates in the normal and reverse directions, and accordingly, the link 40 rocks the movable bearing 39 in the left and right directions, and the mirror 32 moves forward and backward about the vertical support shaft 36. It is designed to rotate.

Reference numeral 46 is a stopper plate which is a mechanical stopper means for restricting the forward / reverse rotation amount (swing amount) of the swing plate 41, and this plate 46 has a pin 42 a of a pin 42 a as shown in FIG. An arc-shaped elongated hole 46a that regulates the amount of movement is formed. That is, the pin 42a projects upward from the long hole 46a and moves along with the long hole 46a as the rocking plate 41 rotates, but the pin 42a moves the inner peripheral edge 46a ₁ of the longitudinal end of the long hole 46a. by abutting the 46a _2, the amount of rotation of the swing plate 41 (the swing amount) is regulated, to which therefore mirror 32 is inclined 45 degrees to the optical axis L from the optical axis L and parallel first position It can be rotated up to position 2. That is, when the pin 42a comes into contact with the inner peripheral edge 46a ₁ (46a ₂ ) of the longitudinal end portion of the long hole 46a, the mirror 32 is in the first position (parallel to the optical axis at a first angle of 45 degrees). Position 2).

When the pin 42 a contacts the inner peripheral edge 46 a ₁ (46 a ₂ ) of the longitudinal end of the elongated hole 46 a and the rotation of the rocking plate 41 is restricted, an excessive load is applied to the reduction mechanism 45 and the motor M. However, since the rotary damper 43 provided in the rotational force transmission path idles and an excessive load does not act on the reduction gear mechanism 45 and the motor M, the teeth of the reduction gear mechanism 45 may be broken or the motor M may be damaged. There are no problems such as burning out.

On the oscillating plate 41, another pin 42b is vertically provided on the opposite side of the pin 42a, and on the stopper plate 46, another long hole 46b facing the long hole 46a is formed. The pin 42b and the elongated hole 46b which project from the hole 46b also have a function of restricting the amount of rotation of the rocking plate 41. That is, by abutting the longitudinal end portion peripheral edge 46b ₁ of the pin 42b elongated hole 46 (46b _2), the mirror 32 is a first position (second position).

An over-center spring 47 is interposed between the pin 42b and the fixed pin 46c vertically provided on the stopper plate 46, as shown in FIG. As shown in FIG. 6A, the spring force F of the spring 47 acts as a reaction force (load on the motor M) that blocks the rotation of the swing plate 41 at the beginning of rotation, but FIG. ), When the oscillating plate 41 is rotated by a predetermined amount (to a position where the pin 42b is at least half the length of the long hole 46b), the oscillating plate 41 acts in the direction of urging the oscillating plate 41 in the rotational direction. The load on the motor M is reduced. The spring 47 presses and holds the pin 42b against the inner peripheral edges 46b ₁ and 46b ₂ of the longitudinal ends of the elongated holes 46b, whereby the mirror 32 is parallel to the optical axis when the motor M is not driven. The first position or the second position inclined with respect to the optical axis is biased and held.

As shown in FIGS. 7 and 8, the mirror 32 has a back surface formed into a smooth surface, and the front surface thereof is a diffusion step for diffusing light outward in the vehicle width direction. The structure is such that the dramatic step 32a is formed. Then, at the second position where the mirror 32 is inclined with respect to the optical axis L, as shown by the solid line in FIG. 8, the parallel light L ₁ emitted from the light projection unit is reflected on the rear surface of the mirror 32 and is adjacent to the outside in the vehicle width direction. to it is guided to the front is reflected by the surface of the mirror 32, so that the light reflected by the flat reflecting surface of the rear surface of the mirror 32 by the cylindrical step 32a of the adjacent mirror surfaces, indicated at L _2, car It is reflected and diffused outward in the width direction. On the other hand, at the first position where the mirror 32 is parallel to the optical axis L (see the phantom line in FIG. 8), the parallel light is guided forward through the opening between the mirror 32 and the mirror 32, and thus is not diffused. .

The drive of the variable light distribution mechanism is controlled by a momentary switch S and a rotary damper 43 which is a torque limiter, as shown in FIG. That is, when one end of the switch S is pressed, the current is supplied to the motor M for a predetermined time, the motor M rotates in the positive direction, the variable mechanism is driven, and the mirror 32 becomes parallel to the optical axis. At the first position, a condensed light distribution is formed as shown in FIG. On the contrary, when the other end of the switch S is pushed, a current is supplied to the motor M in the reverse direction for a predetermined time, the motor M rotates in the reverse direction, and the variable mechanism is driven to tilt the mirror 32 with respect to the optical axis. At the second position, a diffused light distribution is formed as shown in FIG.

FIG. 11 and FIG. 12 show a variable light distribution mechanism of a fog lamp in which the light distribution color is changed by rocking the yellow globe surrounding the bulb (Actual Kaihei 3-82503, Actual Kaihei 4-99602, Actual Kaihei). No. 4-99603) shows an embodiment to which the present invention is applied. Reference numeral 50 denotes a parabolic reflector, and in front of the reflector 50, a yellow glove 52 supported by a swing lever 51 surrounds a valve 53 mounted on the reflector 50 at a first position (see FIG. 11). The solid line) and the second position spaced from the valve 53 (see the phantom line in FIG. 11) are selectively set. That is, a crank 54 is fixedly mounted on a rotary shaft fixedly integrated with the lever 51, and the crank 54 is provided via a drive link 55 so as to project on a rotating disc 56 that can be rotated in the forward and reverse directions by a motor M. Connected to the pin 57. The rotary disc 56 is connected to the output shaft of a rotary damper (not shown), and the power transmission mechanism from the rotary damper 43 to the motor M in the mirror drive mechanism shown in the first embodiment is used as it is. ing.

Reference numeral 58 is a stopper plate fixed to the drive unit case 59 in which the motor M and the speed reduction mechanism 45 are housed, and the pin 57 is brought into contact with the lower edge 58 a of the plate 58 to cause shaking. The amount of swing of the moving lever 51 (the amount of movement of the yellow glove in the longitudinal direction) is regulated. At the first position where the globe 52 surrounds the bulb 53, the light distribution color takes on the yellow color of the yellow globe 52, and at the second position where the globe 52 is separated from the bulb 53 in the forward direction, the light distribution color reaches the bulb. It is the same as the emission color of 53. Further, the speed reduction mechanism 45 has a structure in which the double gears 45c and 45d are provided between the pinion 45b and the gear 45a so that the speed can be reduced more than in the above-described embodiment. The spring 47 is interposed between the pin 57 and the pin 58b on the stopper plate 58 side to hold the pin 57 against the lower edge 58a of the stopper plate 58.

FIG. 13 shows an embodiment in which the present invention is applied to a reflector slide mechanism (Japanese Patent Application No. 5-194250) for sliding the reflector to the left and right with respect to the lens. A projection lens (not shown) supported by a lens holder 61 is arranged in front of the reflector 60 having a substantially ellipsoidal shape in which a bulb (not shown) is mounted, and the light reflected by the reflector 60 is reflected by the projection lens. A projection type lamp is configured in which the light is projected and distributed by a projection lens.

The reflector 60 is suspended by a parallel link 62 so that the reflector 60 can swing in the left-right direction with respect to the lens holder 61. The rotary disk 66 is connected to the output shaft of the motor via a rotary damper and a reduction mechanism (not shown). The pin 67 projecting from the rotating disk 66 and the reflector 60 are connected via the drive link 65, and the drive link 65 swings left and right by the forward and reverse rotation of the motor. Then, the reflector 60 swings to the left and right, whereby the optical axis is tilted to the left and right, and the hot zone is shifted to the left and right. Reference numeral 68 is a stopper plate fixed to the lens holder 61, and the pin 67 abuts on the lower edge 69a of the notch 69 that extends horizontally, so that the rotation amount of the rotating disk 66, that is, the swing amount of the reflector 60 is restricted. Has been done.

14 and 15 show an embodiment in which the present invention is applied to a parallel slide mechanism of an inner lens (Japanese Patent Application No. 5-16 3176). A parabolic reflector is integrally formed on the inner peripheral surface of the lamp body 70, and an outer lens 72 having left and right diffusion steps (cylindrical steps) is attached to the front opening of the lamp body 70. Has been. Inside the outer lens 72, an inner lens 73, which is also formed with left and right diffusion steps (cylindrical steps), is provided so that it can move toward and away from the outer lens 72. That is, the inner lens 73 can slide in the front-back direction of the optical axis by the parallel link 74, and the pin 77 and one of the parallel links 74 protruding from the lower surface of the horizontally arranged rotating disk 76 are connected by the drive link 75. ing. The rotary disc 76 is connected to the output shaft of the motor M via the rotary damper 43 and the speed reduction mechanism 45, and the forward / reverse rotation of the motor M causes the rotary disc 76 to rotate forward / reversely and the parallel link 74 to swing. The inner lens 73 moves toward and away from the outer lens 72.

The pin 77 projecting from the rotary disk 76 comes into contact with a stopper plate (not shown) provided on the rotary shaft trace of the pin 77, and thereby the amount of rotation (movement of the inner lens 73 in the front-back direction). Amount) is regulated. Then, at a position where the inner lens 73 is farthest from the outer lens 72, a diffusion angle of outgoing light is large and a light distribution having a large degree of diffusion is formed. A light distribution with a small diffusion angle of emitted light and a small degree of diffusion is formed.

[0026]

[Effect of device]

 As is apparent from the above description, according to the drive control device for the optical member for controlling the light distribution in the variable light distribution headlamp according to the present invention, the mechanical stopper means for stopping the power transmission member of the power transmission mechanism. With a simple structure including a torque limiter that absorbs an excessive load acting on the motor, the light distribution control optical member can be accurately positioned in two different predetermined positions, and thus two different distribution positions can be obtained. It can be properly switched to light.

Further, the torque limiter indispensable to the configuration of the present invention is cheaper than the controller and the position sensor, and the mechanical stopper means simply forms the stopper portion in the drive mechanism of the light distribution control optical member. The number of component parts of the device is small, the weight of the entire device is light, and the price of the entire device is low.

[Brief description of drawings]

FIG. 1 is a front view of a fog lamp that is a first embodiment of the present invention.

FIG. 2 is a horizontal sectional view of the lamp (a sectional view taken along line II-II shown in FIG. 1).

FIG. 3 is a vertical sectional view of the lamp (a sectional view taken along line III-III shown in FIG. 1).

FIG. 4 is an exploded perspective view of a variable light distribution mechanism.

FIG. 5 is an enlarged perspective view around the stopper plate.

FIG. 6 is an explanatory view illustrating the action of a center over spring.

FIG. 7 is an enlarged perspective view of a light distribution control mirror.

FIG. 8 is an explanatory view for explaining the action of a diffusion step which is a light distribution control step formed on the mirror surface.

FIG. 9 is a block diagram of a drive control device for a variable light distribution mechanism.

FIG. 10 is a diagram showing a light distribution pattern created by a fog lamp.

FIG. 11 is a sectional view of an embodiment in which the present invention is applied to a yellow glove swing mechanism.

FIG. 12 is a perspective view of the swing mechanism.

FIG. 13 is a perspective view of an embodiment in which the present invention is applied to a reflector left / right slide mechanism.

FIG. 14 is a sectional view of an embodiment in which the present invention is applied to an inner lens slide parallel mechanism.

FIG. 15 is a perspective view of a main part of the slide mechanism.

FIG. 16 is a horizontal sectional view of a conventional lamp.

FIG. 17 is a block diagram of a drive control device of a mirror drive mechanism in the lamp.

[Explanation of symbols]

M motor 23 bulb as light source 32 mirror as optical member for light distribution control 35 mirror drive mechanism as power transmission mechanism 43 rotary damper 46a as torque limiter long hole 42b, 57, 67 of stopper plate as mechanical stopper means , 77 Pins that are power transmission members 52 Yellow gloves that are optical members for controlling light distribution 60 Reflectors that are optical members for controlling light distribution 73 Inner lenses 58 that are optical members for controlling light distribution Stopper plates that are mechanical stoppers 68 Stopper plate as mechanical stopper means

Claims (1)

[Scope of utility model registration request] 1. A forward / reverse rotational force of a motor is transmitted to a light distribution control optical member via a power transmission mechanism composed of a plurality of power transmission members, and the light distribution control optical member moves two different positions with respect to a light source. In the drive control device of the light distribution control optical member in the variable light distribution headlamp in which the light distribution is switched to two stages, the light distribution control optical member is placed at two different predetermined positions. The means for locating is constituted by a mechanical stopper means for contacting a power transmission member constituting the power transmission mechanism to stop the power transmission member at a predetermined position, and a power transmission member stopped by the stopper means. A light distribution control in a variable light distribution headlight, characterized in that a torque limiter is provided between the output shaft of the motor and the motor when the rotation torque exceeds a predetermined value. Drive control unit of the optical member.