JPH02230603A - Headlamp for vehicle - Google Patents

Abstract

PURPOSE:To obtain a headlamp possible to flash freely and switch the radiation momently by using a discharge lamp as a light source, and comprising a shading means possible to be positioned against a reflector opening part. CONSTITUTION:A discharge lamp is used as a light source 2, and an upper half of the inner surface of a reflector 1 is processed to be a reflecting mirror with reflecting-cut for generating a luminaire flux pattern of a low beam, and a shutter 4 is provided in the opening lower end 10a. The shutter is supported switchably by a shaft 12 connected to a driving mechanism and can be set to respective position of a shading position A, a main beam position B and a low beam position C. A passing work is realized by full opening/closing an opening 10, and temporary or momently switching can be performed. Wen the opening of the reflector 1 is full opened by the shutter 4, the heat insulating effect in the reflector can be obtained to reduce the power consumption of the light source 2.

Description

[Detailed Description of the Invention] E-Industrial Application Field] The present invention relates to a projector type vehicle headlamp, and particularly relates to the configuration of the light distribution pattern of the vehicle headlamp and the switching operation of turning it on and off. This is an improvement.

[Prior Art 1] Conventionally, in this type of projector-type vehicle headlamp, as shown in FIG. A reflector 1 formed as a surface reflecting mirror, a light source 2 such as an incandescent light bulb mounted inside the reflector 1, supported by a plurality of legs S on the reflector opening 10 side, and projecting reflected light from the reflector forward. A convex lens 3 is provided to reflect a portion of the reflected light from the reflector 1 near the focal point of the convex lens 3.
There is a structure in which a shutter 4 formed in a circular shape is movably disposed via an appropriate driving means.

The shutter 4 is provided to configure the light distribution pattern of this type of vehicle headlamp, and when the shutter 4 is not located on the reflected light irradiation path, the shutter 4 is provided to configure the light distribution pattern of this type of vehicle headlamp. When the shutter 4 is located on the reflected light irradiation path, the light distribution pattern of the passing beam is shifted.

However, in such a vehicle lamp, the shutter 4 is arranged near the focal point of the convex lens 3 and is configured only to switch the light distribution pattern, and for example, the shutter 4 is configured only to switch the light distribution pattern at an instant such as bashing irradiation. At present, switching on/off or temporarily turning off the light is accomplished by switching the light source itself on/off.

[Problems to be Solved by the Invention] For this reason, it is desired to use a discharge lamp with a higher luminous intensity than an incandescent lamp or the like as a light source, since switching between turning on and off the lamp is done by the light source itself. However, the use of discharge lamps has been discouraged because they have a longer lighting time than incandescent lamps, and it is difficult to turn them on/off instantaneously.

Furthermore, some conventional vehicle headlights have a discharge lamp as a light source and are preheated by a heater provided near the discharge lamp in order to shorten the lighting time. However, even in this case, it is difficult to switch the lights on and off instantaneously for bashing irradiation, so a separate incandescent light bulb must be provided for bashing irradiation, and the light will not flash! Without it, bashing irradiation is not possible, and even if only the incandescent lightning ball for bashing irradiation blinks when the discharge lamp is emitting light, the pA recognition from a distance is lower because the discharge lamp has a higher luminous intensity. Although the number of parts increases, the corresponding effect cannot be obtained, and if the light source is a discharge lamp, reliable bashing irradiation etc. cannot be achieved.

The present invention has been made under these circumstances, and its purpose is to enable switching between lighting and extinguishment without being restricted by the lighting time even if a discharge lamp is used as a light source. To provide a vehicle headlamp which can realize instantaneous switching such as bashing irradiation.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention provides a lens equipped with a light source, a convex lens that projects the reflected light from the reflector forward, and a lens that projects the reflected light from the reflector forward. In a projector type vehicle headlamp comprising a convex lens and a shutter provided intermediately, the light source is a discharge lamp,
It is constructed by providing a light shielding means that can be set at each of a light shielding position, a passing beam position, and a traveling beam position with respect to the frontage of the reflector.

[Function 1] That is, according to the present invention, the light source is a discharge lamp, and the reflector opening is provided with a light shielding means that can be set to a light shielding position, a low beam position, and a traveling beam position, respectively. The traveling beam and the misaligned beam are switched depending on the setting position of the light shielding means relative to the opening, and by providing the light shielding means at a light shielding position that closes this opening, the passage of reflected light from the reflector is cut off. Bashing irradiation is realized by repeatedly providing an opening in a closed state and an open state, and the light distribution pattern can be switched or temporarily by mechanical operation of the light shielding means without turning on or off the light source itself. Alternatively, the light can be switched on and off instantaneously.

[Example] The present invention will be explained in detail below with reference to the example shown in FIGS. 1 to 4. Note that in this example, the fifth
The same reference numerals are used for the parts having the same structure as those of the conventional structure shown in the figure, and the explanation thereof will be omitted.

FIG. 1 shows an embodiment of the present invention, and is designated by the reference numeral 2.
The light source shown in is a discharge lamp, and the reflector 1 to which this discharge lamp 2 is attached is subjected to a reflective mirror treatment consisting of a reflective cut on a half part of its inner periphery to produce a light distribution pattern of two different beams. In addition, a light shielding means is provided at the lower end 10a of the opening of the reflector 1. For example, the light shielding means may include a shield 11 formed to cover the frontage of the reflector and block the reflected light. A vine 4 is provided, and the shutter 4 is rotatably supported via a shaft 12 connected to a suitable drive mechanism (not shown) such as a rack and binion, and the light is blocked by the side of the drive machine.
It can be set to both the traveling beam position and the passing beam position.

FIG. 2 shows the set positions of the light shielding means, where (A> indicates the light shielding position n, and the free end of the shutter 4 is positioned on the opening upper end 10b side, and the opening 10 is fully closed. (B) shows the traveling beam position, the aperture 10 is set to be fully open and all reflected light passes through the convex lens 3, and (C) shows the position of the traveling beam. Indicate the beam position, move the free end of the shutter 4 using the shaft 1-12 as a fulcrum, and set the aperture 10 in a half-open state so that only the light reflected from the upper tenth part of the reflector 1 is reflected.
It is set so that it passes toward the convex lens 3.

Therefore, the light distribution pattern for the traveling beam and the light distribution pattern for the passing beam can be switched by the reflector opening 10.
This can be done simply by changing the setting position of the light shielding means,
Moreover, by repeatedly configuring the spacer section 10 between a completely idle state and an open state using this light shielding means, a bashing effect is realized, and it is possible to temporarily or instantaneously turn off and turn on the light.

Figure 3 is the second fruit of this invention! This is an example, and the opening lower end 10 of the reflector 1 is used as a light shielding means.
A is provided with a lower shutter 4a formed to cover the lower half of this opening, and an upper shutter 4b formed to cover the upper half of the frontage 10 is provided at the upper end of the opening 10b, respectively. The lower shutter 4a and the free end of the two-part shutter 4b overlap near the opening radial position of the reflector 1.

As a result, as shown in FIG. 4, the free end of the lower shutter 4 and the free end of the upper shutter V ivy 4b are overlapped to place the opening 10 in a completely blank state (A). , the free end of the upper shutter 4b is moved around its shaft 12 to be in an open state, and the lower shutter 4a is in a leaping state so that only the reflected light from the upper half of the reflector opening is directed to the convex lens 3. The free end of the lower shutter 4a is also moved about its shaft 12 as a fulcrum, and the frontage 10 is set in a fully open state to allow all reflected light to pass through the convex lens 3. It is provided so that it can be set at each of the traveling beam positions (C). Further, as in the first embodiment described above, the bashing effect can be realized by repeatedly configuring the opening 10 to be in the fully closed state and the open state by the respective shutters 4a and 4b.

[Effects of the Invention] As described above, according to the present invention, a discharge lamp is used as a light source, and a light shielding means that can be set to a light shielding position, a passing beam position, and a traveling beam position is provided for the reflector opening. As a result, switching between the running beam and the passing beam can be done by changing the setting position of the light shielding means relative to the reflector opening, and by fully opening the reflector opening with the light shielding means, the light reflected from the reflector can be blocked. Because the passage is cut off, the discharge lamp remains lit without being turned on or off, and the mechanical operation of the shutter causes the lamp to temporarily turn on and off, causing the shutter to fully close and open the opening repeatedly. In addition to making it possible to realize a bashing effect, when the light is turned off when the vehicle stops for several tens of seconds at a stop signal, etc., it is only necessary to set the reflector opening to the full state with a shutter. It has excellent effects such as turning off the lamp and turning it on at the time of departure smoothly, and the lamp can be turned on and off instantly without being tied to the time it takes to turn on the discharge lamp. .

In addition, for lamp shells equipped with discharge lamps that are preheated by installing a heater near the discharge tube in order to shorten the lighting time, it is possible to keep the heat inside the reflector by fully covering the reflector opening with a shutter. Since this effect is obtained, the energy related to the heater power can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a first embodiment of the present invention, FIG. 2 is an explanatory diagram schematically showing the setting position of the light shielding means, and FIG. 3 is an explanatory diagram showing a second embodiment of the present invention. , FIG. 4 is an explanatory diagram schematically showing the setting position of the light shielding means, and FIG. 5 is an explanatory diagram of the conventional structure. 4a...Lower shutter 4b...Upper shutter

Claims (3)

[Claims] (1) A projector-type vehicle headlamp comprising a reflector equipped with a light source, a convex lens that projects the reflected light from the reflector forward, and a shutter provided between the reflector and the convex lens, A headlamp for a vehicle, characterized in that the light source is a discharge lamp, and a light shielding means that can be set to a light shielding position, a passing beam position, and a running beam position is provided with respect to the reflector opening. (2) The light shielding means is a shutter having a shape that covers the entire opening of the reflector and is disposed at the lower end of the frontage of the reflector so as to be openable and closable.
The vehicle headlamp according to claim 1, wherein the vehicle headlamp is located at a running beam position when fully opened and is located at a passing beam position when half opened. (3) The light shielding means includes a lower shutter disposed at the lower end of the opening of the reflector and an upper shutter disposed at the upper end of the opening, and the free end sides of the respective shutters overlap near the radial position of the opening, and The vehicle headlamp according to claim 1, wherein the vehicle headlamp has a light-shielding position where the opening is fully open, a running beam position when the opening is fully open, and a passing beam position when only the upper half of the opening is open.