JPH0658502U - Four-lamp car headlamp - Google Patents

Abstract

(57) [Summary] [Purpose] The light distribution pattern is controlled by a very simple method.
Providing four-lamp car headlamps that can be controlled. [Structure] A pair of left and right for forming straight beams for straight running
First lamp 10A ₁, 10A₂And for passing on a curved road
A pair of left and right second lamps 10B for forming a beam₁, 1
0B₂It is a four-lamp type headlamp for automobiles equipped with
A pair of second lamps 10B₁, 10B₂The output light
For light distribution control that refracts light on either the left or right side
Prism means (diffusing prism) 20B₁, 20B₂Set up
First lamp 10A₁(10A₂) Required when lit
According to this second lamp 10B₁(10B₂) Lights up
The diffusion zone area in the light distribution pattern to the left or
Expand to the right to increase visibility on curved roads
I chose

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a headlamp for a four-lamp type automobile, in which a pair of right and left passing beam forming lamps and a pair of right and left passing beam forming lamps are provided respectively on the left and right sides.

[0002]

[Prior art]

 As shown in FIG. 11, a conventional four-lamp type headlamp includes a pair of first lamps a and a for forming a traveling beam on the inside and a pair of passing beams on the outside for forming a traveling beam. In the structure in which the second lamps b, b of FIG. 12 are arranged, a light distribution pattern as shown in FIG. 12 is obtained which has good distant visibility when the first lamp a is turned on. When turned on, a light distribution pattern as shown in FIG. 13 with good lateral visibility is obtained. However, there is a problem that the visibility at the right corner is poor when the vehicle is traveling on a curved road that turns to the right as shown in FIG. 13 when forming the low beam. It should be noted that Figs. 11 to 13 show a case where the vehicle is traveling to the left side and a headlight having a left light distribution characteristic, and a headlamp having a right light distribution characteristic, which is used in the United States, conversely turns to the left on a curved road. The visibility is poor.

Further, in order to improve the visibility of traveling on a curved road, a technique has been proposed in which a light distribution pattern is controlled by mechanically moving a reflector in the lamp body in conjunction with steering. However, there is a problem in that the structure that links the reflector to the steering wheel is complicated and the cost is high.

[0004]

[Problems to be solved by the device]

 The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide a four-lamp type automobile headlamp capable of controlling a light distribution pattern by a very simple method.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, in a four-lamp type automobile headlamp according to claim 1, a pair of left and right first lamps for forming a low beam for straight running and a low beam forming for curved road. A four-lamp type headlamp for an automobile, comprising a pair of left and right second lamps for use in light distribution control for refracting emitted light to one of the left and right sides different from each other. The prism means is provided.

According to a second aspect of the present invention, in the four-lamp type automobile headlamp according to the first aspect, lighting of the second lamp is linked to steering operation.

[0007]

[Action]

 By turning on the second lamp, the light distribution pattern of the straight-passing passing beam created by the first lamp is emitted by the prism means to the left or right side of the second lamp. The light distribution patterns of the passing beams for traveling on curved roads are combined to form a light distribution pattern in which the diffusion zone area is expanded to either the left or right side.

According to the second aspect of the present invention, when the second lamp is turned on in association with the steering operation, such as right when the vehicle turns clockwise and left when the vehicle turns counterclockwise, the diffusion zone area of the light distribution pattern. Moves left and right.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 8 show an embodiment of the present invention. FIG. 1 is a front view of an automobile equipped with a four-lamp type automobile headlamp according to this embodiment, and FIG. 2 is a four-lamp shown in FIG. Headlamp on the left side (left side when viewed from the driver) of the headlamp (a sectional view taken along the line II-II shown in FIG. 1), and FIG. 3 is a longitudinal sectional view of the headlamp (a line shown on FIG. 2) (Sectional view taken along line III-III), FIG. 4 is an enlarged perspective view showing a diffuser prism, which is a main part of the headlamp, FIG. 5 is a diagram for explaining the operation of the diffuser prism, and FIGS. It is a figure which shows the light distribution pattern formed by the light projection unit of FIG.

In these drawings, in a container-shaped lamp body 2, light projection units 10A ₁ and 10B ₁ (10A ₂ and 10B ₂ ) supported by an aiming mechanism (not shown) are housed in parallel. Has been done. Although not described in detail, the light projection units 10A ₁ and 10B ₁ (10A ₂ and 10B ₂ ) are supported by an aiming mechanism so as to be tiltable around a horizontal axis and a vertical axis, which are not shown, and operate the aiming mechanism. By doing so, the emission direction of the light emitted from the light projection units 10A ₁ and 10B ₁ (10A ₂ and 10B ₂ ), that is, the irradiation axes (optical axes) La and Lb of the headlamp can be tilted vertically and horizontally. it can. Reference numeral 4 is a transparent front cover assembled to the front opening of the lamp body 2.

The light projection unit 10 (10A ₁ , 10B ₁ ) has a substantially ellipsoidal reflector 14 in which a halogen bulb 12 is attached, and a projection lens 16 arranged in front of the reflector 14 integrated with each other. With this structure, the projection lens 16 is supported by a lens holder 17 which is fixed to the reflector 14 with a screw. Inside the reflector 14, an elliptical reflecting surface 15 formed by aluminum vapor deposition is formed. This elliptical reflecting surface 15 has a well-known first focal point F ₁ and second focal point F _2, and is located at the first focal point F ₁ position. Is the filament that is the light source of the halogen bulb 12. At the focus position of the projection lens 16 near the second focus F ₂ , a shade 18 for forming a predetermined clear cut line by blocking a part of the light reflected by the reflector 14 and traveling toward the projection lens 16. (18A, 18B) are provided, and the light emitted from the bulb 12 is reflected by the elliptical reflecting surface 15 to be guided forward, and is projected and distributed by the projection lens 16 in the front of the headlamp into substantially parallel light. , A predetermined light distribution pattern for each passing beam is formed.

In front of the projection lens 16 of the light projection unit 10B ₁ , a semi-circular diffusion prism 20B ₁ for refracting the light emitted from the projection lens 16 to the front left direction when viewed from the driver is arranged. There is. As shown in FIGS. 4 and 5, this diffusing prism 20B ₁ has prism steps 21 formed on the back surface for refracting incident light to the left (to the left when viewed from the driver), and the transmitted light to the left and right on the front surface. It has a structure in which cylindrical steps 22 for diffusing in the direction are formed. The diffusing prism 20B ₁ is fixed to a synthetic resin extension panel 30 that is integrated with the cylindrical holder 24 and extends around the light projection unit 10. The extension panel 30 has an aluminum vapor-deposited surface, and when the headlamp is viewed from the front, the entire interior of the lamp looks silver and has a good appearance.

The right headlamp (right side as viewed from the driver), on which the light projection units 10A ₂ and 10B ₂ are arranged in parallel, is symmetrical with the arrangement of the light projection units 10A ₁ and 10B ₁ of the left headlamp. Only the semicircular diffusion prism 20B ₂ provided in front of the projection unit 10B ₂ is different. That is, a prism step that refracts incident light to the right (rightward when viewed from the driver) is formed on the back surface of the diffusing prism 20B ₂ , and a cylindrical step that diffuses transmitted light to the left and right is formed on the surface. Has become.

In the four-lamp type headlamp shown in FIG. 1, the light projection unit 10A₁Or 10A₂When is turned on, as shown in FIG. 6, a light distribution pattern of a straight-traveling passing beam in which the diffusion zone area 26 is near the intersection of the horizontal line H and the vertical line V is formed. In addition, the light projection unit 10B₁When is turned on, as shown in FIG. 7, the light distribution pattern of the passing beam for left-handed curved road travel is formed in which the diffusion zone area 26 is enlarged to the left as compared with the light distribution pattern shown in FIG. In addition, the light projection unit 10B ₂ When is turned on, as shown in FIG. 8, the light distribution pattern of the passing beam for the right-handed curved road is formed in which the diffusion zone area 26 is enlarged rightward as compared with the light distribution pattern shown in FIG.

The lighting of the light projection units 10A ₁ , 10A ₂ , 10B ₁ and 10B ₂ is controlled in association with the turning amount of the steering. That is, when the turning amount of the steering is within a predetermined angle from the straight traveling position to the left and right, only the light projection units 10A ₁ and 10A ₂ are turned on and a light distribution pattern (see FIG. 6) suitable for straight traveling performance at the time of passing each other is obtained. It is formed. When the turning amount of the steering wheel exceeds the predetermined angle in the counterclockwise direction from the position of the straight traveling state, only the light projection units 10A ₂ and 10B ₁ are turned on, and the left turn traveling in which the light distribution patterns shown in FIGS. The light distribution pattern has good visibility at the time. On the contrary, when the turning amount of the steering exceeds the predetermined angle in the clockwise direction from the straight traveling position, only the light projection units 10A ₁ and 10B ₂ are turned on, and the right turn in which the light distribution patterns shown in FIGS. The light distribution pattern has good visibility when traveling.

9 and 10 show another embodiment of the present invention. FIG. 9 is a front view of a vehicle equipped with a headlamp for a four-lamp type automobile, and FIG. 10 is a main part of the headlamp. It is an expansion horizontal sectional view of a diffusion prism. The shape of the diffusion prism in the first embodiment as seen from the front is semicircular, but the diffusion prisms 20B ₃ and 20B ₄ in this embodiment are circular as seen from the front, and the prism steps in the first embodiment are the same. A cylindrical prism step 23, which has both the light refracting action of 21 and the light diffusing action of the cylindrical step 22, is formed on the back surface.

In the two embodiments described above, the diffusion prisms 20B ₁ , 20B ₂ (20B ₃ , 20B ₄ ) are provided in front of the light projection units 10B ₁ , 10B ₂ ; Instead of separately providing the transparent front cover 4, the prism step 21 and the cylindrical step 22 or the cylindrical prism step 23 are directly formed in a predetermined area (the light transmitting area from the light projection units 10B ₁ and 10B ₂ ). Alternatively, the diffusion prism may be integrally attached to the light projection unit in front of the projection lens.

Further, although the halogen bulb is used as the light source in the above-mentioned embodiment, if a discharge bulb having a large light quantity is used instead of the halogen bulb, the visibility is further improved.

[0019]

[Effect of device]

 As is clear from the above description, according to the four-lamp type automobile headlamp according to the present invention, by lighting the second lamp, the light distribution pattern of the low beam for straight running made by the first lamp is obtained. , The light distribution pattern of the passing beam for traveling on a curved road made by the second lamp, which is emitted and distributed to the left or right side by the prism means, is combined to move the diffusion zone area to the left or right side. Since the light distribution pattern is formed as described above, it is possible to enhance the side visibility with a simple structure.

According to the second aspect, when the second lamp is turned on in association with the steering operation, such as right when the vehicle turns clockwise and left when the vehicle turns counterclockwise, the diffusion zone area of the light distribution pattern. Is enlarged to the left and right, which improves visibility when turning and enhances safety.

[Brief description of drawings]

FIG. 1 is a front view of an automobile equipped with a four-lamp type automobile headlamp according to an embodiment of the present invention.

FIG. 2 is a horizontal cross-sectional view of the headlamp on the left side (left side as viewed from the driver) of the four-lamp headlamp shown in FIG.
(Cross-sectional view taken along the line II-II shown in)

FIG. 3 is a longitudinal sectional view of the same headlamp (see line III in FIG. 2).
-Cross section view along III)

FIG. 4 is an enlarged perspective view showing a diffusion prism which is a main part of the headlamp.

FIG. 5 is a view for explaining the function of the diffusion prism.

FIG. 6 is a view showing a light distribution pattern of a straight traveling low beam formed by an optical projection unit.

FIG. 7 is a diagram showing a light distribution pattern of a counter-beam for left-handed curved road travel formed by an optical projection unit.

FIG. 8 is a view showing a light distribution pattern of a right-handed turning-dipped passing beam formed by an optical projection unit.

FIG. 9 is a front view of an automobile equipped with a four-lamp type automotive headlamp according to another embodiment of the present invention.

FIG. 10 is an enlarged horizontal sectional view of a diffusion prism.

FIG. 11 is a front view of an automobile equipped with a conventional four-lamp headlamp.

FIG. 12 is a diagram showing a light distribution pattern of a traveling beam formed by the headlamp.

FIG. 13 is a diagram showing a light distribution pattern of a low beam formed by the headlamp.

[Explanation of symbols]

2 lamp body 10 light projection unit 10A ₁ , 10A ₂ light projection unit 10B ₁ , 10B ₂ which is the first lamp light projection unit 12 which is the second lamp 12 halogen bulb 16 projection lens 18 (18A, 18B) clear cut line Shade for format 20B ₁ , 20B ₂ , 20B ₃ , 20B ₄ Diffusion prism which is a prism means for controlling light distribution 21 Prism step which is means for refracting light 22 Cylindrical step 23 which is means for diffusing light Cylindrical prism step which is a means to diffuse

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI technical display location G02B 5/04 A 9224-2K // F21M 3/22 L 9249-3K (72) Inventor Takashi Nakamura 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd. (72) Creator Takakazu Mori 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A four-lamp type headlamp for an automobile, comprising a pair of left and right first lamps for forming a low beam for straight traveling and a pair of left and right second lamps for forming a low beam for traveling on a curved road. So, in the pair of second lamps,
A headlamp for a four-lamp type automobile, characterized in that prism means for light distribution control for refracting emitted light to different right or left sides is provided. 2. The headlamp for a four-light type automobile according to claim 1, wherein the lighting of the second lamp is linked to a steering operation.