JPH08216776A - Automatic dimmer control device of headlamp of car - Google Patents

Abstract

PURPOSE: To make an automatic light extinction control device of a headlamp of an automobile compact, excellent in integrity, easy in installation and excellent in interference with stray light. CONSTITUTION: A cylindrical cup shape housing 8 includes an elastic rubber pad 9, a thick film type control circuit chip 7, a light guiding sleeve 5, a photosensitive sensor 6, a convex lens 3 and a press ring 1. Additionally, the control circuit chip 7 makes contact with the rubber pad 9 provided on a cup bottom part of the housing and firmly connected to the photosensitive sensor 6 arranged at a central position of the bottom part of the light guiding sleeve 5, an outer edge part of the convex lens 3 is pressed by a peripheral part of the light guiding sleeve 5 and pressed by the press ring 1 integrated by press fitting engagement in an opening part of the housing 8, and a conductor 11 of the control circuit chip 7 is taken out through a housing wall.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle headlamp automatic dimming control device that automatically operates when another vehicle approaches from the front.

[0002]

2. Description of the Related Art When driving at a high lamp position that illuminates a distant road surface along an unlit road at night, it is normal for the driver of the car to keep directing light to another car approaching from the front. Driving may be affected and an accident may occur. Therefore, the road traffic rules stipulate that the headlamps be dropped to the low lamp position when the vehicles are 100 to 200 m apart and approaching each other. Such switching of the lamp position is usually performed by a driver, but recently, it has been performed by an automatic dimming control device.

[0003]

The conventional automatic dimming control device, for example, in the solution means described in Utility Model No. 91232502X, controls the dimming by receiving an optical signal from a vehicle approaching at a short distance. Therefore, the photoelectric probe is provided at a position different from that of the control device. The use of such probes has several drawbacks. For example, loosening tends to occur between probe components after long use,
This causes movement of the conductive sensor and displacement of the focal point of the convex lens, which prevents normal operation of the control device. In addition, there are problems such as overweight of the probe assembly, it is relatively difficult to use and maintain the probe assembly, and misjudgment may occur due to interference from stray light.

An object of the present invention is to provide an automatic dimming control device for an automobile headlamp which can solve the above-mentioned problems.

[0005]

An automatic dimming control device according to the present invention receives a light from a housing, a convex lens housed in the housing for receiving light from a headlight, and a light converged by the convex lens. In the automatic dimming control device including a photoelectric sensor attached to the focal position of the convex lens, the housing of the automatic dimming control device is a cup-shaped outer cover having a cylindrical interior, and the housing is An elastic rubber pad, a control circuit chip, a light guide sleeve, a light sensitive sensor, a convex lens, and a pressing ring are included, and the control circuit chip abuts and guides the rubber pad provided on the bottom of the cup of the housing. It is fixedly connected to a photosensitive sensor arranged at the center of the bottom of the sleeve, and the outer edge of the convex lens is pressed against the peripheral portion of the light guide sleeve and Is pressed into the cylindrical cup opening of Ujingu by the pressing ring are integrated by press-fitting, the conductor of the control circuit chip, characterized in that the retrieved through the housing wall.

In addition to this, a bubble type level gauge may be attached to the housing. Further, the housing has an integral support lever, and a universal ball joint that engages with a locking bush of the same type is provided at a free end portion of the support lever, and a positioning grip clamp is integrated with the bush. It is also possible to adopt a configuration that can be provided. Further, a lens layer having a refractive index higher than that of the convex lens may be provided on the outer surface of the convex lens. Further, the lens layer may be a transparent film coat layer.

[0007]

In the present invention, the probe is integral with the control circuit, and the size of the entire automatic dimming control device is reduced by adopting the thick film circuit, and the internal structure is made compact. In addition, the cushion prevents the loosening structure from ensuring the sensitivity of the automatic dimming control device.

Further, in the structure in which the universal ball joint is provided at the free end of the support lever, the weight of the automatic dimming control device can be reduced. Providing the level gauge facilitates the work of mounting and thus can ensure a stable operating state.

When a lens layer having a refractive index higher than that of the convex lens is provided on the outer surface of the convex lens, that is, the incident surface, the conventional principle of refraction of natural light causes
When the incident angle is larger than the critical angle of total internal reflection, stray light coming from both sides of the road surface is reflected, smaller than the critical angle of total internal reflection, and smaller than the convergent incident angle of the convex lens after being refracted to the outer surface of the convex lens. The other part of the stray light with a large angle of incidence does not reach the contact point of the conductive sensor at the focal position, so that a considerable part of the interference caused by the stray light can be extinguished, thus collecting the optical signal from the oncoming vehicle. The accuracy of can be improved.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. The automatic dimming control device according to the present invention has a cylindrical cup-shaped housing 8, a cushion cup 10 is arranged at the bottom inside thereof, and an elastic rubber pad 9 is arranged in the cushion cup 10. The control circuit chip 7 contacts the rubber pad 9, and the photosensitive sensor 6 is arranged integrally with the control circuit chip 7. The light sensitive sensor 6 is arranged at the focal point of the convex lens 3 in the center of the base of the light guide sleeve 5. The peripheral portion of the light guide sleeve 5 presses the control circuit chip 7.

The outer surface of the convex lens 3 is covered with a plano lens 2 having a refractive index higher than that of the convex lens 3, and the plano lens 2 is composed of a coating layer of an organic film and has a function of eliminating interference with stray light. Is. The inner surface of the convex lens 3 is firmly pressed against the peripheral portion of the light guide sleeve 5. A pressing ring 1 for pressing the convex lens 3 against the peripheral portion of the light guide sleeve 5 is arranged at the peripheral rim portion of the opening of the housing 8. The pressure ring 1 and the housing 8 form an interference fit, which overcomes the disadvantages that vibrational loosening in the case of conventional screw connections tends to cause.

All the members between the rubber pad 9 and the pressing ring 1 are maintained in a predetermined position while being elastically pressed. Even if vibration occurs, no gap is created, thus maintaining the accuracy of assembly of the automatic dimming control device. A bubble type level gauge 4 is arranged outside the housing 8 and is calibrated on a horizontal scale.
Is easy to place.

The housing 8 is an integral support lever 8
A universal ball joint 12 which has a and which engages with a corresponding type bush 13 is provided at the free end of this support lever 8a and is locked in place. The bush 13 is integrated with the positioning and grasping clamp 14, and is attached by a locking bolt 15.

As shown in FIG. 2, the bushing 13 can be suitably attached to the frame 16 of the mirror 17 in the driver's compartment of an automobile. The signal and power line 11 (FIG. 1) is taken out through the wall of the housing 8.

[0015]

The automatic dimming control device according to the present invention has a small size, a compact structure, excellent integration, is easy to install, and is relatively stable in operation and preventing stray light. Are better.

[Brief description of drawings]

FIG. 1 is a sectional view showing an automatic dimming control device according to an embodiment of the present invention.

FIG. 2 is a view showing a state where the automatic dimming control device of FIG. 1 is attached to a driver room of an automobile.

[Explanation of symbols]

 1 ... Pressing ring 2 ... Plane lens 3 ... Convex lens 4 ... Level gauge 5 ... Light guide sleeve 6 ... Photosensitive sensor 7 ... Control circuit chip 8 ... Housing 9 ... Rubber pad 10 ... Cushion cup 12 ... Universal ball joint 13 ... Bush

Claims (5)

[Claims] 1. A housing, a convex lens housed in the housing for receiving light from a headlight, and a photoelectric sensor mounted at a focal point of the convex lens for receiving light converged by the convex lens. In the automatic dimming control device provided, the housing of the automatic dimming control device is a cup-shaped jacket having a cylindrical interior, and the housing includes an elastic rubber pad, a control circuit chip, and a light guide sleeve. A photosensitive sensor, a convex lens, and a pressing ring, wherein the control circuit chip is in contact with a rubber pad provided at the bottom of the cup of the housing and is located at the center of the bottom of the light guide sleeve. Fixedly connected, the outer edge of the convex lens is pressed against the peripheral portion of the light guide sleeve, and is press-fitted into the cylindrical cup opening of the housing. It is pressed by the conjugated been pressing ring, control circuit chip conductors automatic dimming control and wherein the withdrawn through the housing wall. 2. The automatic dimming control device according to claim 1, wherein a bubble type level gauge is attached to the housing. 3. A housing having an integral support lever, the free end of which is provided with a universal ball joint which engages a locking bush of the same type, and a positioning gripping clamp having said bushing. The automatic dimming control device according to claim 1, wherein the automatic dimming control device is provided so as to be integrated with the device. 4. The automatic dimming control device according to claim 1, wherein a lens layer having a refractive index higher than that of the convex lens is provided on an outer surface of the convex lens. 5. The automatic dimming control device according to claim 4, wherein the lens layer is a coat layer of a transparent film.