JP2504584Y2 - Automotive headlamp - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to an automobile headlamp having a structure in which light emitted from a bulb is emitted to the front of the lamp through a reflector, and particularly to a main reflector as a reflector that reflects light. In addition, the present invention relates to an automobile headlamp provided with a sub reflector.

[Problems to be solved by conventional technology and device]

In a conventional automobile headlamp, as shown in FIG. 9, a bulb 4 is provided in the vicinity of the focal position of the reflector 2 so that the light emitted by the bulb 4 is reflected forward by the reflector 2. Reference numeral 6 is a light blocking plate for blocking the direct light of the valve, which is harmful light.

However, the conventional headlamp has a problem that the direct light from the bulb directed forward is blocked by the light shielding plate 6, and the illuminance of the headlamp is low accordingly. That is, there is a problem that the direct light to the front of the bulb is not effectively used.

FIG. 10 shows another conventional technique (West German Patent No. 1801627).
In addition to the main reflector 12, the valve 14
There is disclosed a lamp in which a sub-reflector 16 is provided at the front position of the lamp, and direct light directed forward from the bulb 14 is reflected in a predetermined front direction through the sub-reflector 16 to effectively use the light of the filament.

However, the sub-reflector system shown in FIG. 10 does not specifically disclose means for attaching the sub-reflector 16 to the main reflector 12. Furthermore, automobile headlamps require a light blocking member to block harmful light, but this light blocking member is generally a separate item from the sub-reflector and can be mounted independently.
As a result, the number of parts has increased, and the work of assembling the lamps, such as attaching these members, has been troublesome.

The present invention has been made in view of the above-mentioned problems of the prior art, and a first object thereof is to provide an automobile headlamp that can obtain a large illuminance by effectively using the direct light emitted from the bulb to the front. , And the second purpose is
An object of the present invention is to provide a vehicle headlamp that is excellent in lamp assembly workability by integrating a light shielding member and a sub reflector.

[Means for solving the problem]

In order to achieve the above object, in a vehicle headlamp according to the present invention, a bulb is provided so that a filament is located near a focal point of a reflector having a substantially parabolic shape, and a bulb is provided in front of the bulb. A conical cylindrical light-shielding portion that blocks direct light to the front, and a divergent cylindrical sub that is arranged around the light-shielding portion and that reflects the direct light obliquely forward from the bulb in a predetermined forward direction. A headlamp for an automobile provided with a light-shielding member with a sub-reflector integrated with a reflector, wherein a rear end portion of a light-reflecting surface of the sub-reflector has left and right side edges of the filament of the bulb and the light-reflecting surface of the reflector. It is located on the straight line that connects with.

[Action]

Conventionally, the light blocking member blocks the direct light from the bulb toward the front, but in the present invention, a part of the direct light from the bulb toward the front is reflected by the sub-reflector in a predetermined direction in front of the lamp. Since the light is guided, the direct light from the bulb toward the front can be effectively used.

In addition, the divergent cylindrical sub-reflector placed so that the rear end of the light reflecting surface is located on the straight line connecting the filament of the bulb and the left and right side edges of the light reflecting surface of the reflector is emitted from the bulb. Then, the direct light traveling forward from the light reflecting surface of the reflector is reliably and forwardly reflected.

Further, the light-shielding member with a sub-reflector has a function of blocking direct light from the bulb toward the front and a function of reflecting a part of the light and guiding the light to a predetermined front direction. Since only one member is required, the number of parts is reduced and the lamp assembling work becomes easy.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

1 to 8 show an automobile headlamp which is an embodiment of the present invention. FIG. 1 is a horizontal sectional view of the headlamp, FIG. 2 is a longitudinal sectional view thereof, and FIG. 3 is a main sectional view. The front view of the reflector, FIG. 4 is a perspective view of the light-shielding member with a sub-reflector seen from the front side, FIG. 5 is a perspective view of the light-shielding member with a sub-reflector seen from the back side, and FIG. 6 is shown in FIG. FIG. 7 is a cross-sectional view taken along line VI-VI, FIG. 7 is an explanatory view for explaining the arrangement of the sub-reflector and the light shielding portion, and FIG. 8 is a view showing a light distribution pattern of the headlamp of this embodiment.

In these drawings, reference numeral 20 is a container-shaped lamp body having a rectangular shape when viewed from the front, and a parabolic main reflector 22 is integrally formed on the inner peripheral surface of the lamp body 20. A bulb insertion hole 21 is formed in the rear top portion of the lamp body 20, and a bulb 24 is attached here. The position of the filament 25 in the bulb 24, which is the light emission source, is set so as to match the focal position of the main reflector 22, and the filament 25 is the filament 25 for the sub beam.
It consists of a and the main beam filament 25b. Then, the light emitted from the filament 25 is emitted from the bulb and reflected by the main reflector 22 as shown by reference numeral l ₁ in FIG. ₁ , becomes light substantially parallel to the optical axis L, is guided to the front, and is directed to the front surface of the lamp body. Front lens 26 engaged and integrated with the opening
Is emitted from the front of the lamp. Further, a light-shielding coating portion 24a called black top is formed at the tip of the bulb to block the light emitted from the bulb to the front and prevent the generation of harmful light.

The main reflector 22 has a focal length formed on the left and right of the valve insertion hole 21 (hereinafter, the focal length is indicated by F) 28.
F20 to 24 (for example, F22) formed above and below the reflector area A ₄₃ (for example, F43) and the valve insertion hole 21
The reflector area F ₂₂ has a structure having two light reflecting surfaces having different focal lengths. In the reflector area A ₄₃ , the hot zone P ₁ at the central portion is formed in the light distribution pattern of the headlamp of the present embodiment shown in FIG.
The reflector area A ₂₂ forms a central lower zone P ₂ of the same pattern. Particularly as the lower end of the lower zone P ₂ is the position in the vertical direction diffusion angle 10-12 degrees lamp light distribution, the focal length of the reflector region A ₂₂ is set to F _22, also of the sub-reflector 30B to be described later A part (indicated by reference numeral 35) is cut out so as not to interfere with the light distribution by the reflected light in the reflector area A ₂₂ .

Reference numeral 30 denotes a light-shielding member with a reflector provided in front of the bulb 24, and direct light from the bulb 24 to the front (first
A light shielding portion 30A which shields Figure reference numeral l _3), and the sub-reflector 30B for guiding the direct light obliquely forward (see FIG. 1 reference numeral l ₂₎ in the reflected light forwardly a predetermined direction from the bulb is integrally formed It has a structure. As shown in FIGS. 4 and 5, the shading member 30 with a sub-reflector has a substantially bowl-shaped inner cylindrical body 32 having an opening on the bottom surface which constitutes the shading portion 30A, and a bottom surface which constitutes the sub-reflector 30B. And a substantially bowl-shaped outer cylindrical body 34 having an opening, which are concentrically arranged in opposite directions to each other, are connected and integrated by three ribs 36 extending in the radial direction, and are formed by integral molding of synthetic resin. Has been.

A concave portion 35 (see FIG. 4) is formed on the upper side surface of the outer cylindrical body 34, and a light reflecting surface 34a is formed by aluminum vapor deposition on the inner peripheral surface of the outer cylindrical body 34 excluding the concave portion forming wall 33. . The inner peripheral edge of the light reflecting surface 34a of the sub reflector 30B on the bulb side is
As shown in FIG. 1, a straight line La, which connects the filament 25 and the left and right front side edges 22a, 22b of the main reflector 22,
The light-reflecting surface 34a is located on Lb, and the outer peripheral edge of the light-reflecting surface 34a protrudes from the front end of the bulb to the front position. It has a shape capable of reflecting (see reference numeral l _{2 in the} drawing) and guided to the front, that is, a parabolic shape with the position of the filament 25 as the focal point. The focal length of the light reflecting surface 34a of the sub-reflector 30B is set to F8, and when the sub-beam filament 25a is used, the sub-reflector 30B allows the horizontal diffusion angle indicated by P ₃ in FIG.
A zone with a diffuse light distribution of 19 degrees can be obtained. A concave portion 35 is formed on the upper side surface of the outer cylindrical body 34 so that the sub-reflector 30B is partially cut away. Due to the concave portion 35, the reflection in the reflector area A ₂₂ of the main reflector 22 is reflected. Light subreflector 30
The light is distributed to the front without being blocked by B to form the lower zone shown in P ₂ of FIG.

Further, the light shielding portion 30A is composed of an inner cylindrical body 32 and a recess forming wall 33, and these are the bulb 2 inside the sub reflector 30B.
It is arranged around the tip of 4 to block the direct light (see reference numeral l _{3 in} FIG. 1) from the filament 25 further obliquely forward so that the direct light of the bulb is not guided forward. Since the valve 24 but direct light forward black tops 24a are formed is shielded, the light as shown in FIG. 1 reference numeral l ₃ is emitted forward from the black top non-formation portions, shielding it It is designed to be blocked by the section 30A. Then, as shown in FIG. 7, the bulb-side inner peripheral edge of the light-shielding portion 30A has a filament 25 and a black top edge 24a _1.
Is located in front of a straight line Lc that connects to and the outer peripheral edge extends to a position that intersects a straight line Ld that connects the filament 25 and the outer peripheral edge on the front surface side of the sub reflector 30B. Further light-shielding part
A collar portion 31 is provided around the inner peripheral edge of 30A, and as shown by reference numeral l ₃₁ in FIG. 7, the reflected light of the light blocked by the light shielding portion 30A is blocked to ensure forward light leakage prevention. There is. Further, the outer peripheral edge of the light shielding portion 30A and the inner peripheral edge of the sub-reflector 30B do not overlap in the optical axis L direction, that is, a gap d is formed between them in the optical axis direction.
(See FIG. 7) is formed, and the light reflected by the main reflector 22 is guided forward through this gap. Reference numeral 37 is a flange portion provided around the outer periphery of the outer cylindrical body 34 constituting the sub-reflector 30B, and reference numeral 38 is a rib extending between the flange portion 37 and the outer cylindrical body 34.
7, 38 is an outer cylinder 34 and, by extension, a light-shielding member 30 with a sub-reflector.
Is a reinforcing member for increasing the strength of the.

Reference numeral 40 denotes a boss portion projecting on the back side of the sub reflector 30B, and a screw hole 41 is formed here. Further, a pair of fixing ribs 42, 42 are provided on the back side of the sub reflector 30B sandwiching the boss portion 40 so as to project.
Are fitted in vertical grooves 50, 50 formed inside the lamp body, respectively. And the screw hole 41 of the lamp body 20
A screw insertion hole 52 is opened at a position opposite to the lamp body. From the back side of the lamp body, a fastening screw 54 is passed through the screw insertion hole 52 and screwed into the screw hole 41 of the boss portion. Are integrated into the lamp body 20.

As described above, in this embodiment, since the sub-reflector light-shielding member 30 in which the sub-reflector and the light-shielding member are integrated is attached to the reflector 22, in the conventional case, two parts of the sub-reflector and the light-shielding member are used. While each must be attached, it is sufficient to attach one part.

In the above-described embodiment, the case where the valve having the black top is used has been described, but there may be a valve in which the black top 24a is not formed, and in this case, the front opening of the light shielding portion 30A is not provided. It may be a closed structure.

In the embodiment described above, the main reflector 22 has a multiple reflector structure composed of a plurality of light reflecting surfaces A ₄₃ and A ₂₂ having different focal lengths. However, this main reflector has a single focal length. The single light reflecting surface structure can be similarly applied.

[Effect of device]

As is clear from the above description, in the past, all the direct light from the bulb toward the front was blocked by the light blocking member, whereas in the vehicle headlamp according to the present invention,
Since a part of the direct light emitted from the bulb toward the front is reflected by the sub-reflector to be guided in a predetermined direction in front of the lamp, the illuminance of the headlamp increases accordingly. Since the illuminance becomes large, there is an effect that sufficient illuminance can be secured even if the depth and the vertical width of the lamp are made small, and it is possible to widely cope with restrictions on the vehicle body side such as a small lamp housing space and various lamp shapes.

In particular, the direct light emitted from the bulb and directed forward from the left and right side edge portions of the light reflecting surface of the reflector is reflected by the light reflecting surface of the sub-reflector in a predetermined forward direction without waste and contributes to the light distribution. A headlamp with very good irradiation efficiency can be obtained.

In addition, the light shielding member with a sub-reflector has a function as a light shielding member for blocking harmful light and a function as a reflector for reflecting a part of the direct light from the bulb toward the front and guiding the light in a predetermined front direction, which is different from the conventional one. Moreover, since the two members are formed by one member, the number of parts is reduced accordingly, and therefore the lamp assembling work becomes easy.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of a headlamp, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is a front view of a main reflector, FIGS. 4 and 5 are perspective views of a sub reflector, and FIG. FIG. 7 is a cross-sectional view taken along line VI-VI shown in the drawing, FIG. 7 is an explanatory view for explaining the arrangement of the sub-reflector and the light-shielding portion, and FIG. 8 is a view showing a light distribution pattern of the headlamp of this embodiment, And the
FIG. 10 is a sectional view of the prior art. 20 ... Lamp body, 22 ... Main reflector, 24 ...
… Valve, 25 …… Filament, 30 …… Shading member with sub-reflector, 30A …… Shading section, 30B… Sub-reflector.

Claims (1)

(57) [Scope of utility model registration request] 1. A valve is provided so that a filament is positioned near a focal point of a reflector having a substantially parabolic shape,
In front of the bulb, a conical cylindrical light-shielding portion that blocks direct light from the bulb in the forward direction, and a light-shielding portion that is arranged around the light-shielding portion and is configured to direct direct light obliquely forward from the valve to the front side. A headlamp for an automobile provided with a light-shielding member with a sub-reflector, which is integrated with a divergent cylindrical sub-reflector that reflects in a direction, wherein the rear end of the light-reflecting surface of the sub-reflector is a filament of the bulb. A headlamp for an automobile, which is located on a straight line connecting the right and left side edges of the light reflecting surface of the reflector.