JPH0749251B2 - Car headlamp - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a headlamp for an automobile, which is equipped with a level for checking whether or not a vertical irradiation angle of the headlamp is in a normal position, The present invention relates to an automobile headlamp that can easily adjust the irradiation angle of the headlamp to the regular position when the headlamp is not in the regular position.

[Problems to be Solved by Prior Art and Invention]

A conventional headlamp of this type is disclosed in US Pat.
As shown in No. 495 and No. 4802067, a level body consisting of a bubble tube is attached to a lamp body / reflector unit that has a reflector integrally formed on the inner peripheral surface, and the horizontal position of the level level is adjusted to the headlamp. There is known a technique in which the irradiation angle of the headlamp can be adjusted by an aiming mechanism while making the irradiation axis coincide with the irradiation axis of (1) while observing the scale (scale where bubbles are located) of the level.

However, when aiming, there is no problem when aiming with the bulb unlit and adjusting to the scale of the level, but when aiming with the bulb lit, the bubble position should be set correctly. It is a problem not shown. That is, the above-mentioned level in the prior art is attached to a lamp body / reflector unit made of synthetic resin having poor heat conductivity, and the level of the level is in a level casing made of synthetic resin having poor heat transfer coefficient. Since the bubble tube is housed in the valve, the amount of heat transferred to the bubble tube of the level when the valve is lit differs between the side closer to the valve, which is the heat source, and the side away from the valve. Therefore, there is a problem that the bubbles in the bubble tube move and deviate from the horizontal position where the bubbles should originally be located.

And the inventors conducted an experiment using a level as shown in FIG. 13 and examined it.The reason why the bubbles move is that the amount of heat transferred from the casing 302 of the level to the bubble tube 304 is in the longitudinal direction of the casing. This is because, unlike (left and right direction in FIG. 13), a temperature difference occurs in the filling liquid in the bubble tube 304, and thus convection from the cold region to the warm region occurs in the bubble tube 304. This is because the reflector 300 and the level casing 302 are made of synthetic resin, and the synthetic resin has a poor thermal conductivity, so that the heat from the valve 306, which is a heat source, is not uniformly transferred to the entire level. That is, on the side (casing front end portion) 302a of the level casing 302 close to the valve 306, the heat conductivity of the reflector 300 and the casing 302 is poor, so that the heat transferred from the valve 306 via the reflector 300 is trapped in a high temperature (about 79 ℃). On the other hand, since the heat transfer path is long on the side (casing rear end) 302b of the spirit level casing away from the valve 306, and the heat conductivity of the reflector 300 and the casing 302 is poor, the heat generated by the valve 306 is sufficiently transferred. Instead, the temperature becomes lower than the casing front end portion 302a (about 70 ° C.). That is, a temperature difference (about 9 ° C.) occurs between the front and rear ends of the casing, and a temperature difference (about 8 ° C.) approximately equal to this temperature difference also occurs between the front and rear ends of the bubble tube. Therefore, in the bubble tube 304, convection due to this temperature difference occurs, and the bubble 305 moves. According to experiments by the inventors, the maximum movement amount of bubbles was equivalent to an inclination angle of 0.38 degrees. Therefore, the inventors of the present invention have made the casing 302 of the spirit level good in thermal conductivity so that the region of the casing 302 away from the heat source can transfer approximately the same amount of heat as the region near the heat source. For example, the present invention has been accomplished based on the knowledge that the amount of heat transferred to each region of the bubble tube 304 will be uniform, that is, the temperature difference in each region of the bubble tube will be small.

The present invention has been made from such a point of view, and its object is to provide each region in the level casing facing the bubble tube even if the temperature of the ambient atmosphere around the level changes, such as lighting or non-lighting of the valve. An object of the present invention is to provide a headlamp for an automobile equipped with a level that has a small measurement error even when there is an external temperature change such as lighting or non-lighting of a light source by making the amount of heat transferred substantially uniform.

[Means for Solving the Problems]

In order to achieve the above object, in the vehicle headlamp according to claim 1, irradiation of the headlamp is performed by tilting the tilting member in the up-down direction and the left-right direction with reference to the reference member of the headlamp. In an automotive headlamp of a tilting member movable type whose angle can be adjusted, at a predetermined position of the tilting member, a spirit level for measuring the vertical tilt of the irradiation angle of the headlamp is attached, and the spirit level is The bubble tube is housed in a casing made of a material having a high thermal conductivity such as metal, and is arranged in a state of being floated from the tilting member by the carrying part so that the substantially entire lower surface of the casing is separated from the tilting member. It was done.

Further, in claim (2), in the automobile headlamp according to claim (1), the tilting member made of a synthetic resin is provided with the supporting portion projectingly formed.

In addition, in the automobile headlamp according to claim (3), in addition to the means according to claim (1) or (2), the bubble tube is supported on the back side of the lid of the level and the bubble tube is supported. An adiabatic air layer is formed between the casing and the casing.

Further, in claim (4), the reference member is a lamp body, and the tilting member is a reflector movable headlamp that is a reflector that can tilt in the lamp body, and the means of any one of claims (1) to (3) is provided. It is applied.

Further, in claim (5), the unit movable type headlamp in which the reference member is the lamp housing and the tilting member is the lamp body / reflector unit in which the reflector is integrally formed on the inner peripheral surface is provided. Any of the means 3) is applied.

[Action]

When the valve is turned on, the amount of heat that is inversely proportional to the length of the heat transfer path is transferred to each region of the level via the tilting member, but the level casing has good thermal conductivity. The amount of heat that is approximately the same as the amount of heat that is transmitted from the heat source to a position that is close to the heat source is also transmitted to a position that is far from the heat source. Therefore, the amount of heat transferred in each region of the casing is smoothed, and a substantially uniform amount of heat is transferred to each region of the bubble tube, which suppresses convection of the filling liquid in the bubble tube.

Furthermore, the heat transfer path to the casing of the spirit level is limited to the carrying part, and the amount of heat transferred to the spirit level decreases due to the adiabatic action of the air layer existing between the casing and the tilting member.
And smoothed.

In claim (2), since the thermal conductivity of the support made of synthetic resin is poor, the amount of heat transferred to the spirit level is further reduced.

In claim (3), the heat transfer amount that is substantially smoothed in each region of the casing is thermally insulated by the heat insulating air layer surrounding the bubble tube, and further smoothed and transferred to the bubble tube.

〔Example〕

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

1 to 8 show a reflector movable type automobile headlamp in which a reference member is a lamp body and a tilting member is a reflector. FIG. 1 is a headlamp in which an irradiation angle adjusting device is assembled. Of the same lamp, FIG. 2 is a plan view of the lamp, FIG. 3 is a horizontal sectional view of the lamp shown by partially cutting it off, and FIG. 4 is a vertical sectional view of the lamp (the line shown in FIG. 1). IV-IV), and FIG. 5 is a vertical cross-sectional view (cross-sectional view taken along line V-V shown in FIG. 1) of an assembling part of a measuring device for measuring the horizontal inclination of the headlamp irradiation direction. ), FIG. 6 is a vertical cross-sectional view (cross-sectional view taken along the line VI-VI shown in FIG. 1) of an assembly portion of a level, which is a measuring instrument for measuring the vertical inclination of the irradiation direction of the headlamp. FIG. 7 is an exploded perspective view of the spirit level, and FIG. 8 is an enlarged vertical sectional view of the spirit level.

In these drawings, reference numeral 2 is a container-shaped lamp body, a reflector 4 is assembled therein, and a front lens 6 is assembled in a rectangular front opening of the lamp body 2 to be integrated as a headlamp. There is.

As shown in FIGS. 1, 3, and 4, the reflector 4 includes a ball joint 10 and three adjusting screws 20, 30.
Supported by dots. The ball portion 12 side of the ball joint 10 is supported by the reflector 4, and the reflector 4 is the ball joint.
It can swing around 10. The adjusting screws 20 and 30 are both rotatably supported by the lamp body 2 and are screwed into the nuts 22 and 32 on the reflector 4 side, respectively, and the adjusting screws 20 and 30 are turned to rotate the nuts 22 and 30. 32 is moved back and forth along the adjusting screws 20 and 30, so that the inclination of the reflector 4 is changed. Reference numeral 14 is a socket that supports the ball portion 12, and is fixedly supported by a bracket 16 fixed to the back side of the reflector 4. Also adjusting screw 2
The nuts 22 and 32 for screwing 0 and 30 are supported by brackets 26 and 36 fixed to the back surface of the reflector 4. Reference numerals 24 and 34 are compression coil springs, and reference numerals 27 and 37 are O.
Rings, reference numerals 28 and 38, are flange portions protruding from the adjusting screws 20 and 30, respectively.

The supporting point of the reflector 4 by the adjusting screw 20 (the screwing portion of the adjusting screw 20 and the nut 22) is orthogonal to the optical axis 1 of the valve 41, which will be described later, and passes through the ball joint 10.
Reflector 4 located on Lx with adjusting screw 30
The support point of (the screwing part of the adjusting screw 30 and the nut 32) is
It is located orthogonal to the optical axis 1 and on the vertical axis Ly passing through the ball joint 10. Therefore, the turning of the adjusting screw 20 causes the reflector 4 to swing about the vertical axis Ly, and the reflector 4
Of the headlamp, that is, the irradiation angle of the headlamp in the left-right direction can be adjusted. On the other hand, the turning of the adjusting screw 30 causes the reflector 4 to swing about the horizontal axis Lx orthogonal to the vertical axis Ly, and the vertical tilt of the reflector 4
That is, the vertical irradiation angle of the headlamp can be adjusted. Thus, the two adjusting screws 20 and 30 can adjust the tilt of the reflector 4, that is, the irradiation angle of the headlamp.

Further, in FIG. 3, reference numeral 40 is a valve socket in which a valve 41 is connected and integrated. An opening 2a for attaching and detaching a bulb socket is formed on the back side of the lamp body 2, and the bulb socket 40 is formed on the rear top of the reflector 4 through the back side opening 2a of the lamp body. It is attached to socket hole 4A. A rubber cover 46, which closes the opening between the reflector 4 and the lamp body 2, is attached to the outer periphery of the rear top of the reflector 4,
Locking cap on outer circumference of valve socket 40
By 47, the bulb socket 40 is pressed and fixed to the socket hole 4A of the lamp body, and the inner peripheral edge portion 46a of the rubber cover 46 is pressed and closely attached to the back side peripheral wall 4B of the lamp body. Reference numeral 42 is a base portion to which the valve 41 is attached, and reference numeral 44 is a cylindrical connector portion provided with a connection terminal inside.

Further, in FIGS. 1 to 4, reference numeral 3 is a lamp body 2.
A seal groove 3a is formed in the peripheral edge of the front opening of the front side, and the sealing agent 3a is loaded in the seal groove 3 to engage the legs of the front lens 6. Reference numeral 7 is a clip for mechanically fastening the front lens 6 and the lamp body 2.

In FIGS. 1 to 3 and 5, reference numeral 50 denotes a horizontal axis.
The first tilt measuring device is provided at a horizontal plane position including Lx, and measures the tilt of the reflector 4 in the left-right direction, that is, the tilt of the headlamp in the irradiation direction. Inside the lamp body 2, a cylindrical protrusion 2b integrally formed with the lamp body protrudes toward the reflector 4, and a recess 4a formed in the left corner portion of the upper wall of the reflector 4 is formed.
It extends above. An inclination measuring device 50 is attached to the lamp body protruding portion 2b and is arranged parallel to the optical axis l. The inclination measuring device 50 includes a cylindrical supporting member 52, a rod member 54 inserted into the supporting member 52, and a supporting member.
It consists of a compression coil spring 56 located in 52 and biasing the rod member 54 forward.

A female screw member 51 is fixed to the tip of the lamp body protruding portion 2b, and a transparent support member 52 made of synthetic resin is attached to the female screw member 51.
Are screwed together. A bulging portion 53 is formed at the rear end of the support member 52, and an O-ring 55 that seals the sliding surface with the lamp body protruding portion 2b is attached to the outer periphery of the bulging portion 53. A cap 58 having a driver engaging portion 59 is welded to and integrated with the bulging portion 53, and the support member 52 is rotated with respect to the female screw member 51 by a driver (not shown). The protruding position of the support member 52 with respect to the lamp body 2 can be moved and adjusted in the axial direction.

The rod member 54 inserted into the support member 52 is a stepped rod, and the small-diameter portion 61 of the rod projects forward by the compression coil spring 56 and is in a biased contact state with the rear surface of the standing wall 4c of the reflector 4. There is. And a transparent support member
A reference line 52a that revolves around the outer periphery of the tip of 52 (see FIG. 5)
On the other hand, on the other hand, the rod small diameter part 61 has a linear scale in the axial direction.
Reference numeral 62 indicates that when the reflector 4 swings around the vertical axis Ly, the rod member 54 also slides back and forth in the axial direction accordingly, and the scale of the reference line 52a position fluctuates. Further, as shown in FIG. 5, the rod small-diameter portion contact surface 4c ₁ of the standing wall 4c is a curved surface having a radius R centered on the horizontal axis Lx, and it may be the first surface depending on the vertical tilt of the lamp body. The scale of the tilt measuring device 50 is fixed. The zero point 62a of the scale 62 is set to coincide with the position of the reference line 52a when the inclination of the reflector 4 in the left-right direction is appropriate, and the scale of the position of the reference line 52a indicates the amount of inclination of the reflector 4 in the left-right direction. It is supposed to be shown.

And the reference line 52a which is the scale reading point of the inclination measuring device 50
A peep window 90 is formed in the lamp body region corresponding to the position, and the scale can be read through the peep window 90. That is, the peep window 90 has a structure in which the transparent convex lens cap 94 is inserted into the opening 92 formed in the lamp body 2, and the scale of the tilt measuring device 50 can be read in an enlarged scale. There is.

In FIG. 1 to FIG. 3 and FIG. 6 to FIG.
Is a level that is a second inclination measuring device for measuring the vertical inclination of the reflector 4, that is, the vertical inclination of the headlamp irradiation direction, and is a recess formed in the right corner area of the upper wall of the reflector 4. It is installed on 4d.

The level 70 has a structure in which a linear bubble tube 80 is housed and integrated in a level casing 71, and is fixedly mounted on the reflector upper wall by four mounting screws 73a. The level casing 71 is made of aluminum die-cast with good thermal conductivity, and comprises a casing body 72 in the shape of a rectangular container that opens upward, and four bracket portions 73 that are formed to extend laterally of the casing body 72. Has been formed. The casing body 72 has a size capable of accommodating a bubble tube 80 described later, and the bracket portion 73 is formed with an engaging portion 73b that engages with the mounting screw 73a. On the other hand, an extension portion 5 extending rearward is formed on an upper wall of the reflector 4, and a boss portion serving as a seat surface for carrying a level is provided on the extension portion 5.
Five points 5a are formed so as to project. A hole 5b for inserting a screw is formed in the upper end surface of each boss 5a, and the bracket 73 is fixed by screwing a mounting screw 73a into this hole. A ring-shaped rubber spacer member 73c is attached to the engaging portion 73b of the bracket portion 73 to prevent the iron mounting screw 73a and the aluminum bracket portion 73 from directly contacting each other.
It is designed to avoid electrolytic corrosion of 73. Reference numeral 5c is a rib for reinforcing the extending portion 5.

In this way, the bracket portion 73 is carried by the boss portion 5a, and the spirit level casing 71 is arranged in a state of floating above the extending portion 5. For this reason, it is difficult for the heat on the reflector side due to the lighting of the valve 41 to be transmitted to the level casing 71.
The temperature of 80 is suppressed from rising due to heat. In order to reduce the number of parts (the number of mounting screws 73a) and to simplify the mounting work of the level 70, the level 70 may be mounted only with two mounting screws located in diagonal positions. .

At the upper opening of the casing main body 72, a lid 74 made of a synthetic resin having a high elasticity such as U polymer or polyacetal having a bubble tube 80 attached to the back side is attached and fixed by an uneven lance engagement and an adjusting screw 78. . That is, a rectangular opening 72b is formed in the side wall 72a at the rear end of the casing main body 72, and a hook 75a that projects vertically downward at the rear end of the lid 74 and engages with the opening 72b on the casing side. Are formed. At the rear end of the lid body, a pair of hooks 75c are formed at both sides of the hook 75a so as to be separated from each other by a slit 75b.
And this hooking portion 75c is the upper end surface 72a of the side wall at the rear end of the casing.
_{When the} hook 75a is engaged with the opening 72b in the state of being in contact with ₁ , the hooking portion 75c and the hook 75a elastically deform in a cantilever manner in opposite directions to each other, as shown in FIG. The rear end of the body is prevented from coming off in the vertical direction and is elastically supported in the vertical direction. Thus, between the rear end of the lid and the side wall 73a at the rear end of the casing, the opening 72b for preventing the rear end of the lid from coming off and elastically supporting it, and the hook 75.
A concave-convex lance elastic engagement portion including a and a hook portion 75c is formed.

On the other hand, a screw insertion hole 74a is opened in the front end portion of the lid 74,
In addition, a screw hole 76a is provided at the front of the bottom surface of the casing body 72.
An open boss portion 76 is formed so as to project. A compression coil spring 77 is arranged around the boss portion 76, and the lid front end portion and the boss portion 76 are screwed together by the adjusting screw 78, whereby the lid front end portion is vertically moved with respect to the casing body 72. It is elastically supported. Reference numeral 76b is a rubber material coated on the inner peripheral surface of the screw hole 76a, and includes an adjusting screw 78 made of iron and a boss portion 76 made of aluminum.
By avoiding direct screwing contact between them, electrolytic corrosion of the boss portion 76 is prevented. By adjusting the screwing amount of the adjusting screw 78, the inclination of the lid 74, that is, the inclination of the bubble tube 80 (the position of the bubble) described later can be adjusted.

In addition, on the back side of the lid 74, a straight type bubble tube in which bubbles 84 are enclosed.
80 is attached by a sandwiching piece 81, and the surface of the bubble tube 80 on which the scale 82 is formed is exposed through a rectangular window 79 formed in the central portion of the lid. Reference numeral 82a indicates the scale zero point position. Bubble tube 8
The holding piece 81, which is a spring member for holding 0, has a lid 74
Is integrally formed with the outer peripheral curved surface of the bubble tube 80 at the curved surface indicated by reference numeral 81a. In this way, the bubble tube 80 is supported in a state of being suspended by the sandwiching piece 81 of the lid 74 in the casing body 72, and an insulating air layer is provided between the casing body 72 and the bubble tube 80.
Since 88 is formed, the heat on the casing side is less likely to be transmitted to the bubble tube 80. To attach the bubble tube 80 to the sandwiching piece 81, by inserting the bubble tube 80 from the tip end side of the sandwiching piece 81, the bubble tube 80 can be attached to the lid 74 with one touch.

Then, when the bulb 41 is turned on in the state where the level 70 is assembled to the extension portion 5 of the reflector 4, the bulb 41 passes through the reflector 4, the extension portion 5 and the boss portion 5a having poor heat conductivity. The heat from the heat source is transferred to the level casing 71 and further to the bubble tube 80. The amount of heat transferred to the casing body 72 has a magnitude inversely proportional to the length of the heat transfer path, and a difference occurs in each region of the casing body 72. However, the casing main body 72 is made of aluminum having a good thermal conductivity, and the difference in the amount of heat transfer in each region transmitted from the reflector 4, the extension portion 5 and the boss portion 5a is smooth in the casing main body 72 having a good thermal conductivity. Be converted. That is, since the casing main body 72 having good thermal conductivity also transfers the same amount of heat to the region where the heat transfer path is long, the difference in the amount of heat generated in each region of the casing main body 72 becomes small. Further, as described above, the bubble tube 80 is held in a state of being suspended by the sandwiching piece 81 in the casing body 72, and the heat insulating air layer 88 exists between the casing body 72 and the bubble tube 80. . Therefore, this adiabatic air layer 88
Acts to insulate and further smooth the heat transferred to the bubble tube 80 via the casing body 72. That is, the heat smoothed in the casing main body 72 is generated by the adiabatic air layer 88.
Is insulated by and further smoothed and is transmitted to the bubble tube 80. Therefore, the amount of heat transferred to the bubble tube 80 is made uniform in the longitudinal direction, and the temperature difference between the front and rear ends of the bubble tube 80 becomes small. Therefore, in the bubble tube 80, convection due to a temperature difference does not occur unlike in the conventional case, and bubbles hardly move.

Next, when attaching this level to the reflector 4,
It will be described with reference to the drawings.

First, by grasping the bubble tube 80 by the sandwiching piece 81,
Attach bubble tube 80 to 74. Next, the rear end of the lid 74 is engaged with the side wall 73a at the rear end of the casing by a lance, and the front end of the lid is screwed to the boss portion 76 by the adjusting screw 78 to be integrated as the level 70. Then, the bracket portion 73 of the casing 71 is aligned with the boss portion 5a on the reflector side,
The bracket portion 73 is screwed to the boss portion 5a with a mounting screw 73a. After the level 70 has been attached to the upper wall of the reflector, the bubbles 84 of the level 70 are linearly scaled when the reflector 4 is tilted in the vertical direction, that is, when the irradiation angle of the headlamp is in the vertical vertical position. Adjust it with the adjusting screw 78 so that it will be at the zero point position 82a of the graduation zero point 82a. As shown in FIG. 6, the level 70 of the lamp body 2
An opening 93 is also formed in a region corresponding to, and a peep window 90 for reading the scale is formed here, and the inclination amount indicated by the level 70 can be read from the peep window 90.

Next, a procedure for adjusting the inclination measuring devices 50, 70 performed when the headlamp is assembled to the vehicle body and a procedure for adjusting the irradiation angle of the headlamp performed thereafter will be described.

As a single headlamp, when the zero point position 62a of the scale of the rod member 54 of the first inclination measuring device 50 coincides with the reference line 52a position, the light distribution characteristic of the headlamp in the left-right direction becomes an appropriate position, and the second The vertical light distribution characteristic of the headlamp is set to an appropriate position when the bubble 84 of the level 70, which is the inclination measuring device, reaches the zero point position 82a of the linear scale 82.

When the headlamp incorporating the first and second inclination measuring devices 50 and 70 is mounted on the vehicle body, the scale display of each inclination measuring device does not come to the proper position due to various errors. Therefore, it is necessary to adjust the scales of the first and second inclinometers to appropriate states.

Next, an example of this scale adjustment method will be described.

In the first inclination measuring device 50, the automobile is positioned at a horizontal position, the light distribution screen is set at a predetermined position in front of the automobile, and the headlamp is turned on. Then, the adjusting screw 20 is rotated to adjust the light distribution of the headlamp so as to come to a predetermined position in the left-right direction on the light distribution screen (so that the irradiation axis 1 of the headlamp coincides with the axle). However, at this time, the reference line position 52a and the scale zero point position 62a do not match due to variations in the lamp mounting surface on the vehicle body side. Then, the support member 52 is pivotally operated by a driver and moved back and forth in the axial direction so that the scale zero point position 62a of the first inclination measuring device coincides with the reference line position 52a. In this way, the scale of the reference line position 52a of the first tilt measuring device 50 is adjusted so as to display a zero point when the irradiation angle of the headlamp in the left-right direction is at a proper position.

On the other hand, in the level 70 which is the second inclination measuring device, the adjusting screw 30 is rotated to adjust the hot zone of the headlamp to a predetermined position in the vertical direction on the light distribution screen. However, the bubble position may not coincide with the zero point position 82a of the scale 82 due to variations in the lamp mounting surface on the vehicle body side. In such a case, the adjusting screw 78 is rotated to adjust the bubbles so that they come to the zero point position 82a of the scale. In this way, when the vertical irradiation angle of the headlamp is at a proper position, the second level measuring device, that is, the level indicator.
The 70 bubbles are adjusted to display the zero point 82a of the scale.

After that, the user adjusts the irradiation angle of the headlamp. Then, looking inside the headlamp from above the upper side wall of the front lens 6, the reference line position 52a of the first inclination measuring device 50 does not indicate the zero point position 62a of the scale, or
The bubble level of the level gauge 70, which is the tilt measuring instrument of the
In the case of deviation from a, it is possible to read the amount of inclination of the lamp body in the horizontal direction or the vertical direction, that is, the deviation of the irradiation angle of the headlamp in the horizontal direction or the vertical direction from these displacement amounts. In such a case, the adjusting screw 20 or 30 is rotated, respectively, so that in the first inclination measuring device 50, the scale zero point position 62a comes to the reference line position 52a, and in the second inclination measuring device. In a certain level 70, each bubble is adjusted so as to come to the scale zero point position 82a.
In this way, the irradiation angle of the headlamp in the horizontal direction or the vertical direction can be adjusted.

FIG. 9 and FIG. 10 show a modified example of the spirit level. FIGS. 9 (a) and 9 (b) show that the thicker (t ₁ By setting <t ₂ , t ₃ <t ₄ ), the heat conductivity is increased toward the rear end side of the casing 71A to further smooth the amount of heat transfer in each region of the casing main body 72A, and to reduce the temperature in the longitudinal direction of the bubble tube. It aims to make the difference even smaller.

Further, in FIG. 10, the surface area is increased by increasing the number of concave and convex grooves 98 formed inside the side wall toward the rear end side of the aluminum casing main body 72B of the level, and the heat dissipation (heat To further smooth the amount of heat transfer in each region of the casing main body 72B and further reduce the temperature difference in the longitudinal direction of the bubble tube.

Further, in the above-described embodiment, the case where the spirit level 70 is attached to the extending portion 5 projecting rearward from the reflector 4 has been described, but as shown in FIG.
The same applies to the case where the level 70 is attached to the upper wall of the reflector 4 without the extension 5 as described above. That is, the area 70b of the reflector 4 closer to the valve 41 (the rear end of the level) has a larger amount of heat transfer than the area 70a farther from the valve 41 (the front end of the level), but is transferred in the aluminum casing 71 having good thermal conductivity. The amount of heat is smoothed, further insulated by an adiabatic air layer surrounding the bubble tube 80, and the amount of heat transfer is further smoothed.

FIG. 12 shows an embodiment in which the present invention is applied to a unit movable type headlamp in which the reference member is the lamp housing and the tilting member is the lamp body / reflector unit (hereinafter referred to as the lamp body unit). .

In the horizontal plane including the horizontal axis Lx of the upper wall 202a of the lamp body unit 202, a first inclination measuring device 250 for measuring the horizontal inclination of the lamp body unit and a second inclination measuring device for measuring the vertical inclination of the lamp body unit. A level level 270, which is an inclination measuring device, is provided. In the first inclination measuring device 250, the transparent supporting member 52 is provided in the lamp housing 200.
The rod member 54, which is attached to the side mounting surface via the holding member 252 and has a scale, is the upper wall of the lamp body unit.
It is urged and abutted against a standing wall 204 protruding from 202a. Standing wall 2
The rod small diameter portion 61 contact surface 204a of 04 is a curved surface centered on the horizontal axis Lx, and is not affected by the vertical tilt of the lamp body unit. The second level measuring instrument 270, which has the same structure as the leveling instrument 70 shown in the first embodiment, is attached and fixed to the upper wall 202a of the lamp body unit. Reference numeral 240 is a valve socket, and reference numeral 247 is a locking cap for fixing the valve socket 240 in the socket hole.

Other configurations are the same as those of the movable reflector type described above, and the description thereof will be omitted by giving the same reference numerals.

In the embodiment described above, the casing 71, 71A, 7 of the spirit level.
Although 1B is described as being made of aluminum, the casing is not limited to aluminum, and may be made of zinc, iron alloy, or other metal with good thermal conductivity, and aluminum powder to further increase thermal conductivity in synthetic resin. The material is not limited to metal as long as it is a material having a high thermal conductivity mixed with the above.

〔The invention's effect〕

As is clear from the above description, in the vehicle headlamp according to the present invention, the reference member (reflector movable type) of the tilting member (reflector movable type reflector, unit movable type lamp body / reflector unit; hereinafter the same). The lamp body, and the unit movable type lamp housing (the same applies to the following), the vertical tilt appears with respect to the level and from this level, the tilting amount of the tilting member, that is, the vertical direction of the headlamp irradiation angle. The amount of tilt can be read.

In order to adjust the vertical irradiation angle of the headlamp, the tilting member can be tilted in the vertical direction so that the bubble of the spirit level is at a predetermined position, so that anyone can easily adjust the vertical angle of the headlamp. The irradiation angle of the direction can be adjusted.

In addition, the temperature of the atmosphere around the level changes due to lighting or non-lighting of the valve, etc. Therefore, the amount of heat transferred to the level casing also differs depending on the length of the transfer path from the heat source, but the level casing has a thermal conductivity. Since it is good, heat is transferred to the long area of the heat transfer path in substantially the same manner as in the short area of the heat transfer path, so that the heat transfer amount in each area of the casing is smoothed.
Therefore, there is almost no difference in the amount of transfer to the bubble tube through the casing in each region of the bubble tube, and the entire filling liquid in the bubble tube shows almost the same temperature change. There is no inconvenience that bubbles move due to the temperature difference that occurs in. Therefore, it is possible to obtain a headlamp with a level having less measurement error due to a change in external temperature, and it is possible to accurately adjust the vertical irradiation angle of the headlamp.

In particular, the heat transfer path to the spirit level casing is limited to the carrying part, and due to the presence of the adiabatic air layer between the tilting member and the casing, the heat transferred from the tilting member to the spirit level is reduced and smoothed. Therefore, the measurement error of the level caused by the external temperature change is further reduced, and the heat resistant strength structure of the bubble tube can be relaxed accordingly.

Further, in claim (2), since the supporting portion is made of synthetic resin and its thermal conductivity is poor, the amount of heat transferred from the tilting member side to the spirit level is reduced accordingly, and the measurement error of the spirit level is further reduced. At the same time, the heat resistant strength structure of the bubble tube can be further relaxed.

Further, in claim (3), since an adiabatic air layer is formed between the casing of the level and the bubble tube, the adiabatic air layer insulates heat transferred from the casing to each region of the bubble tube, and Further smoothing makes it possible to adjust the irradiation angle in the vertical direction of the headlamp more accurately.

[Brief description of drawings]

FIG. 1 is an embodiment in which the present invention is applied to a movable reflector headlamp, and is a front view of the same lamp, FIG. 2 is a plan view of the same lamp, and FIG. 3 is along line III-III shown in FIG. Sectional view, FIG. 4 is a sectional view taken along line IV-IV shown in FIG. 1, and FIG.
The figure is a vertical cross-sectional view around the assembly part of the first inclination measuring device (first
6 is a vertical cross-sectional view around the assembly part of the spirit level, which is the second inclination measuring device, and is a cross-sectional view taken along line VI-VI shown in FIG. Fig. 7 is an exploded perspective view of a spirit level which is a second inclination measuring device, Fig. 8 is an enlarged vertical sectional view of the spirit level, and Fig. 9 (a) is a plan view of a main part of a modification of the spirit level. ,
FIG. 9 (b) is a sectional view taken along the line IX-IX shown in FIG. 9 (a), and FIG. 10 is a longitudinal sectional view of an essential part of another modification of the spirit level.
FIG. 12 is a vertical cross-sectional view of the vicinity of a level assembly part, which is a main part of another embodiment of the present invention, and FIG. 12 is an embodiment in which the present invention is applied to a unit movable headlamp, with a part broken away FIG. 13 is a plan view of the headlamp shown in FIG. 13, and FIG. 13 is a vertical cross-sectional view of the vicinity of the leveler assembly portion of the headlamp used for examining the amount of movement of bubbles. 2 ... Lamp body that is a reference member, 4 ... Reflector that is a tilting member, 5 ... Rear extension of the reflector, 5a ... Boss that is a carrying part that carries a level, 6 ... Front lens, 10 …… A ball joint as a swinging fulcrum of a reflector that is a tilting member, 20 ... Adjusting screw for tilting the reflector that is a tilting member in the left and right directions, 30 ... Tilting the reflector that is a tilting member in the vertical direction Adjustment screw for adjustment, 50,250 …… First inclination measuring device for measuring the inclination of the headlamp's horizontal illumination angle, 70,270 …… Second inclination measuring for measuring the inclination of the headlamp's vertical illumination angle Level, which is a measuring instrument, 71, 71A, 71B ... Casing of level, 80 ... Bubble tube, 84 ... Bubble, 88 ... Insulated air layer surrounding bubble tube, 200 ... Lamp housing as reference member , 202 ... lamp body reflector unit is a tilting member, rearwardly extending portions of 205 ...... lamp body unit, Lx ...... horizontal axis, Ly ...... vertical axis.

Front page continuation (72) Kenji Miyazawa, Kenji Miyazawa, 500 Kitawaki, Shimizu City, Shizuoka Kozu Manufacturing Co., Ltd. Shizuoka Factory (56) References JP-A-1-173501 (JP, A) Mitsuihei 1-144134 (JP, U) Actual opening 63-39617 (JP, U) Actual opening 2-56736 (JP, U) Actual opening 2-42303 (JP, U) Actual opening 3-44611 (JP, U) Actual opening 1 -168903 (JP, U) Actual Kaihei 2-56735 (JP, U)

Claims (5)

[Claims] 1. A tiltable member movable type headlamp for an automobile, wherein a tilting member is tilted in a vertical direction and a horizontal direction with respect to a reference member of the headlamp so that an irradiation angle of the headlamp can be adjusted. At the predetermined position of the member, there is attached a spirit level for measuring the vertical inclination of the irradiation angle of the headlamp. This spirit level has a bubble tube inside a casing made of a material with good thermal conductivity such as metal. A headlamp for an automobile, wherein the headlamp for an automobile is configured to be housed, and is arranged in a state of being floated from the tilting member by a carrying portion, and substantially the entire lower surface of the casing is separated from the tilting member. 2. The headlamp for an automobile according to claim 1, wherein the supporting portion is formed on a tilting member made of synthetic resin so as to project therefrom. 3. The bubble tube is supported on the back side of the lid of the spirit level, and a heat insulating air layer is formed between the bubble tube and the casing. Headlamps for cars. 4. The headlamp for an automobile according to claim 1, wherein the reference member is a lamp body, and the tilting member is a reflector that can tilt within the lamp body. . 5. The reference member is a lamp housing, and the tilting member is a lamp body / reflector unit integrally formed with a reflector on an inner peripheral surface thereof. The automobile headlamp according to any one of the above.