JPH03203113A - Head lamp for automobile - Google Patents

Abstract

PURPOSE:To obtain an automobile head lamp provided with a level having less measurement errors even by any temperature change of the circumferential atmosphere of the level by providing a lining member having a satisfactory heat conductivity in opposition to a bubble tube in the casing of the level. CONSTITUTION:A lining member 100 made of aluminium having satisfactory heat conductivity is disposed on the inside of the casing body 72 of a level 70. This lining member 10 smooths the difference in the conducted heat quantity in each area. The smoothed heat in the lining member is isolated by an air layer interposed between the lining member 100 and a bubble tube 80, further smoothed and conducted to the bubble tube 80. Thus, the heat quantity conducted to the bubble tube 80 is longitudinally uniformed, and the temperature difference between front and rear end parts of the bubble tube 80 becomes less. Therefore, in the bubble tube 80, no convection resulted from the temperature difference is generated, and the movement of bubbles is hardly present.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an automobile headlamp equipped with a spirit level for checking whether the downward irradiation angle of the headlamp is in the correct position. The present invention relates to an automobile headlamp that can easily adjust the irradiation angle of the headlamp to the normal position when the headlamp is not in the normal position.

[Prior art and problems to be solved by the invention] This type of conventional headlamp is disclosed in U.S. Pat. No. 479,449.
As shown in No. 5 and No. 4802067, a level made of a bubble tube is attached to a lamp body reflector unit that has a reflector integrally formed on its inner circumferential surface, and the horizontal position of the level is determined by adjusting the horizontal position of the level on the head. There is a known technique in which the irradiation angle of the headlamp can be adjusted using an aiming mechanism while keeping the headlamp aligned with the irradiation axis of the headlamp while looking at the scale of the level (the scale where the bubble is located).

However, when aiming, there is no problem if you aim according to the scale of the spirit level with the bulb in the unlit state, but if you aim with the bulb in the lit state, the bubble position will not be correctly horizontal. This is a problem because it is not shown. That is, the level in the above-mentioned prior art is attached to a lamp body/reflector unit made of synthetic resin with poor thermal conductivity, and furthermore, the structure of the level includes a level casing made of composite TC resin with poor thermal conductivity. Since the bubble tube is housed inside, the amount of heat transferred to the bubble tube of the spirit level when the bulb is turned on differs between the side closer to the bulb, which is the heat source, and the side farther from the bulb.
For this reason, there was a problem in that the bubbles within the bubble tube moved and were displaced from the horizontal position where the bubbles should originally be located.

The inventors conducted an experiment using a spirit level as shown in Figure 15, and found that the reason why bubbles move is as follows.
The amount of heat transferred from the casing 302 of the spirit level to the bubble tube 304 differs in the longitudinal direction of the casing (left and right direction in FIG. 15), and a temperature difference occurs in the filling liquid in the bubble tube 304, resulting in a cold region inside the bubble tube 304. This is because convection occurs from the warmer region toward the warmer region. This is full flutter 3
This is because the level casing 302 and the level casing 302 are made of synthetic resin, and the synthetic resin has poor thermal conductivity, so the heat from the bulb 306, which is the heat source, is not uniformly transmitted to the entire level. That is, the side (front end of the casing) 3 of the spirit level casing 302 near the valve 306
In '02a, reflector 300 and casing 30
2 has poor thermal conductivity, the heat transferred from the bulb 306 through the reflector tube 300 is trapped, resulting in a high temperature (approx.
℃). On the other hand, on the side 302b of the spirit level casing away from the valve 306 (the rear end of the casing), the heat transfer path is long, and the reflector 300 and the casing 302
Because of the poor thermal conductivity of the valve 306, the heat generated by the valve 306 is not sufficiently transferred, resulting in a temperature lower than that of the casing front end 302a (approximately 70° C.). That is, a temperature difference (approximately 9° C.) occurs between the front and rear ends of the casing, and a temperature difference (approximately 8° C.) approximately equal to this temperature difference also occurs between the front and rear ends of the bubble tube. Therefore, convection occurs within the bubble tube 304 due to this temperature difference, and the bubbles 305 move. According to experiments by the inventors,
The maximum amount of bubble movement was equivalent to an inclination angle of 0.38 degrees. Therefore, by making the casing 302 of the spirit level have good thermal conductivity, the inventors have determined that approximately the same amount of heat is transferred to the area of the cage 4-ring 302 away from the heat source as to the area close to the heat source. If you do this, the bubble tube 304
The amount of heat transferred to each region becomes uniform. That is, the present invention was made based on the knowledge that the temperature difference in each region of the bubble tube would be small.

The present invention has been made from this point of view, and its purpose is to ensure that each area in the level casing facing the bubble tube is maintained even if the temperature of the atmosphere around the level changes, such as when the bulb is turned on or off. It is an object of the present invention to provide a headlamp for an automobile equipped with a level gauge that has a small measurement error even when there are external temperature changes such as turning on and off of a light source by making the amount of heat transferred approximately equal.

[Means to solve the problem]

In order to achieve the above object, in the automobile headlamp according to claim (1), the illumination of the headlamp is improved by tilting the tilting member vertically and horizontally with respect to the reference member of the headlamp. In an automotive headlamp with a movable tilting member whose angle can be adjusted, a level is provided at a predetermined position of the tilting member for measuring the vertical inclination of the irradiation angle of the headlamp, and this level is a synthetic It has a structure in which a bubble tube is housed in a resin casing, and a lining member with good thermal conductivity is arranged inside the casing to face the bubble tube.

Further, in the automobile headlamp according to claim (2), in addition to the means of claim (1), the bubble tube is supported on the back side of the lid of the spirit level, and the lining member is arranged along the inside of the casing. The inner lining member and the vial are arranged to form a heat insulating air layer between the inner lining member and the vial.

In addition, in claim (3), claim (1) or (2)
In addition to the means described above, the casing of the spirit level is arranged to be spaced apart from the tilting member via a supporting portion formed protruding from the tilting member.

Further, in claim (4); the reference member is a lamp body □, and the tilting member is a reflector that can be tilted □ within the lamp body. This method was applied.

Claim (5) further provides a movable unit type headlamp in which the reference member is a lamp housing and the tilting member is a lamp body reflector unit integrally formed with a reflector on the inner peripheral surface; This is an arrangement in which any one of the means described in (3) to (3) is applied.

[Effect]

When the bulb is lit, a heat quantity inversely proportional to the length of the heat conduction path is transferred to each area of the level via the tilting member, which is placed in the casing of the level opposite the bubble tube. The lining material with good heat transfer coefficient can be used both in the long heat transfer path (far from the heat source) and in the short heat transfer path (far from the heat source).
Transfers approximately the same amount of heat as the amount of heat at a location (close to the heat source).

For this reason, the amount of heat transferred in each area of the lining member in the casing is smoothed, and an approximately average amount of heat is transferred to the bubble tube winding 7- =8- area, causing convection in the liquid filled in the bubble tube. In claim (2), the amount of heat transfer that is substantially smoothed in each region of the lining member is insulated by the heat insulating air layer, further smoothed, and transferred to the vial.

In claim (3), the heat transfer path to the casing of the spirit level is limited to the supporting portion protrudingly formed on the tilting member.
The amount of heat transferred to the spirit level is reduced.

〔Example〕 Next, embodiments of the present invention will be described based on the drawings.

Figures 1 to 9 show a reflector-movable type automobile headlamp in which the reference member is the lamp body and the tilting member is the reflector, and Figure 1 shows the headlamp with the irradiation angle adjustment device assembled. A front view of the reflector-movable headlamp, Fig. 2 is a plan view of the lamp, Fig. 3 is a partially cutaway horizontal sectional view of the lamp, and Fig. 4 is a vertical sectional view of the lamp ( Figure 5 is a longitudinal cross-sectional view of the assembly section of the measuring instrument for measuring the horizontal inclination of the headlamp irradiation direction (line IV-IV shown in Figure 1). Figure 6 is a vertical cross-sectional view of the assembly part of a spirit level, which is a measuring device for measuring the vertical inclination of the headlamp's irradiation direction (along the line Vl-Vl shown in Figure 1). 7 is an exploded perspective view of the level, FIG. 8 is a developed view of the lining member disposed inside the level casing, and FIG. 9 is an enlarged longitudinal sectional view of the level.

In these figures, reference numeral 2 denotes a container-shaped lamp body, into which a reflector 4 is assembled, and a front lens 6 is assembled into the rectangular front opening of the lamp body 2, so that it is integrated as a headlamp. ing.

The reflector 4 includes a ball joint 10 and adjusting screws 20, 3, as shown in FIGS. 1, 3, and 4.
It is supported by three points.

The reflector 4 is supported by the beam flexor 4 on the side of the ball portion 12 of the ball joint 10, so that the reflector 4 can swing around the ball joint 10. Further, the adjustment screws 20.30 are both rotatably supported by the lamp body 2, and are screwed into nuts 22.32 on the reflector 4 side, respectively. - 22.32 is moved back and forth along the adjustment screw 20.30, thereby changing the inclination of the reflector 4. The code 14 is Engineering Department 12.
It is fixedly supported by a bracket 16 fixed to the back side of the reflector 4. Also 'fJ
4M screw 20.30 screwing nut 22.32
is a bracket 26 fixed to the back side of the reflector 4.
．． Supported by 36. Code 24.34 is a compression coil spring, code 27.37 is an O-ring, code 2
Reference numerals 8 and 38 are flange portions projecting from the adjusting screw 20.30.

Note that the support point of the reflector 4 by the adjustment screw 20 (the screwed part of the adjustment screw 20 and the nut 22) is located on a horizontal axis Lx that is orthogonal to the optical axis of the bulb 41, which will be described later, and that passes through the ball joint 10. However, the support point of the reflector 4 by the adjusting screw 30 (the threaded portion of the adjusting screw 30 and the nut 32) is located on the vertical axis Ly, which is perpendicular to the optical axis and passes through the ball joint 10. Therefore, by rotating the adjustment screw 20, the reflector 4 swings around the vertical axis Ly, and the horizontal inclination of the reflector 4, that is, the horizontal illumination angle of the headlamp can be adjusted. On the other hand, by rotating the "ism screw 30, the reflector 4 swings around the horizontal axis Lx perpendicular to the vertical axis Ly, and adjusts the vertical inclination of the reflector 4, that is, the vertical illumination angle of the headlamp. In this way, the two adjusting screws 20 and 30 allow the tilting of the reflector 4 to be adjusted, that is, the irradiation angle of the headlamp can be adjusted.

Further, in FIG. 3, reference numeral 40 denotes a bulb socket to which a bulb 41 is connected and integrated.

An opening 2a for attaching and detaching the bulb socket is formed on the back side of the lamp body 2, and the bulb socket 11-2-40 passes through the back side opening 2a of the lamp body and attaches to the rear top of the reflector 4. It is attached to a socket hole 4A formed in. A rubber cover 46 that 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, and a locking cap 47 arranged around the outer periphery of the bulb socket 40 locks the bulb. Insert the socket 40 into the socket hole 4 of the lamp body.
At the same time, the inner circumferential edge 46a of the rubber cover 46 is pressed into close contact with the back side circumferential wall 4B of the lamp body. Note that the reference numeral 42 is a base portion to which the valve 41 is attached, and the reference numeral 44 is a cylindrical connector portion having connection terminals provided therein.

In addition, in FIGS. 1 to 4, the reference numeral 3 indicates the lamp body 2.
A sealing agent 3a is loaded into the sealing groove 3, and the front lens 6 is sealed.
legs are engaged. Further, 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 is provided at a horizontal plane position including the horizontal axis Lx, and measures the horizontal inclination of the reflector 4, that is, the horizontal inclination of the irradiation direction of the headlamp. This is the first inclination measuring device. Inside the lamp body 2, a cylindrical protrusion 2b integrally formed with the lamp body protrudes toward the reflector 4.
It extends over a recess 4a formed in the left corner region of the upper wall of the reflector 4. A tilt measuring device 50 is attached to this lamp body protrusion 2b and is arranged parallel to the optical axis Q. The inclination measuring device 50 includes a cylindrical support member 52, a rod member 54 inserted into the support member 52, and a compression coil spring 56 located within the support member 52 and urging the rod member 54 forward. .

A female screw member 51 is fixed to the tip of the lamp body protrusion 2b, and a transparent support member 52 made of synthetic resin is screwed into the female screw member 51. A bulging portion 53 is formed at the rear end of the support member 52, and an O-ring 55 is attached to the outer periphery of the bulging portion 53 to seal the sliding surface with the lamp body protrusion 2b. Further, a cap 58 on which a driver engaging portion 59 is formed is welded and integrated with the expanded diameter portion 53, and the supporting member 52 is rotated relative to the female thread member 51 by a driver (not shown). , the protruding position of the support member 52 relative to the lamp body 2 can be adjusted by moving back and forth 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 protrudes forward by the compression coil spring 56, and comes into biased contact with the back surface of the vertical wall 4c of the reflector 4. ing. On the outer periphery of the tip of the transparent support member 52, there is a reference line 52a that goes around.
(See Fig. 5), and on the other hand, the small diameter portion 61 of the rond is provided with a linear scale 62 in the axial direction, and the reflector
4 swings around the vertical axis La, the rod member 54 also slides back and forth in the axial direction, and the scale at the reference line 52a position changes. Further, the contact surface 49□ of the rod small diameter portion of the vertical wall 4c is a curved surface with a radius R centered on the horizontal axis Lx, as shown in FIG. The scale of the inclination measuring device 50 is designed not to fluctuate. Then, when the horizontal inclination of the reflector 4 is appropriate, the reference line 5
The zero point 62a of the scale 62 is set to coincide with the reference line 52a position, and the scale at the reference line 52a position is set to coincide with the reflector 4.
It is designed to represent the amount of inclination in the left and right direction.

And the reference line 5 which is the scale reading point of the inclination measuring device 50
A peephole 9 is provided in the lamp body area corresponding to position 2a.
0 is formed, and the scale can be read through this viewing window 90. That is, the viewing window 90 has a structure in which a transparent convex lens cap 94 is inserted into an opening 92 formed in the lamp body 2, so that the scale of the inclination measuring device 50 can be enlarged and read. There is.

In FIGS. 1 to 3 and 6 to 9, reference numeral 7
0 is a level that is a second inclination measuring device that measures the vertical inclination of the reflector 4, that is, the vertical inclination of the irradiation direction of the headlamp. It is arranged on the recessed part 4d formed in the area. The level 70 is a level casing 7
The level gauge 70 has an integrated structure in which a straight bubble tube 80 is housed inside the reflector 1, and the level 70 is fixed to the upper surface of the upper wall of the reflector by four mounting screws 73a.

The spirit level casing 71 is a molded body of synthetic resin, and is formed from a rectangular container-shaped casing body 72 that opens upward, and four bracket parts 73 extending from the sides of the casing body 72. .

The casing body 72 is sized to accommodate a bubble tube 80, which will be described later, and the bracket portion 73 is formed with an engaging portion 73b that engages with a mounting screw 73a. On the other hand, an extending portion 5 extending rearward is formed on the upper wall of the reflector 4, and four boss portions 5a protruding from the extending portion 5 are formed as seating surfaces for supporting a spirit level. .

A screw insertion hole 5b is formed in the upper end surface of each boss portion, and the bracket portion 73 is fixed by screwing a mounting screw 73a into the hole 5b. Note that the reference numeral 5c is a rib for reinforcing the extension portion 5.

In this way, the bracket part 73 is supported by the boss part 5a, and the level casing 71 is placed floating from the extension part 5. Therefore, the heat on the reflector side caused by the lighting of the bulb 41 is not easily transmitted to the spirit level casing 71, and the temperature of the bubble tube 80 is suppressed from rising due to the heat. In addition, in order to reduce the number of parts (the number of mounting screws 73a) and to simplify the work of installing the level 70, it is necessary to install the level 70 using only two mounting screws located diagonally.
You may also install it.

The upper opening of the casing body 72 has a bubble pipe 8 on the back side.
A cover body 74 made of a highly elastic synthetic resin such as U polymer or polyacetal with which 0 is attached engages with the uneven lance and adjusts the adjustment screw 7.
It is fixedly attached by 8. That is, a rectangular opening 72b is formed in the side wall 72a at the rear end of the casing body 72, and a hook 75a is formed at the rear end of the lid 74, protruding vertically downward and engaging with the opening 72b on the casing side.
is formed. Also, at the rear end of the lid, there is a hook 7.
A pair of hooking portions 75c are formed extending from both sides of 5a with a slit 75b in between.

Then, with this hook 75c in contact with the upper end surface 72a of the side wall at the rear end of the casing, the hook 75a is attached to the opening 72b.
When engaged with the hook 75c, as shown in FIG.
and the hook 75a are elastically deformed in opposite directions to each other in a cantilever shape, and the rear end of the lid body is prevented from being pulled out in the vertical direction.
It is designed to be elastically supported in the vertical direction. In this way, between the rear end of the lid and the side wall 73a at the rear end of the casing, there is an opening 72b, a hook 75a, and a hook 75c that prevent the rear end of the lid from being removed and elastically support it. An uneven lance elastic engagement portion is formed.

On the other hand, a screw insertion hole 74a is formed at the front end of the lid body 74, and a boss portion 76 having a screw hole 76a is formed protruding from the bottom front portion of the casing body 72. And around the boss part 76 is a compression coil spring 77.
is arranged, and the front end of the lid body and the boss portion 76 are screwed together by an adjustment screw 78, thereby elastically supporting the front end of the lid body with respect to the casing body 72 in the vertical direction. Further, 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), which will be described later, can be adjusted.

Further, on the back side of the lid body 74, a straight level vial 80 containing an air bubble 84 is attached by a clamping piece 81, and a scale 82 of the vial tube 80 is formed through a rectangular window 79 formed in the center of the lid body. The face is exposed. Reference numeral 82a indicates the zero point position of the scale. A clamping piece 81, which is a spring member for clamping the bubble tube 80, is integrally molded with the lid 74 and grips the outer circumferential curved surface of the bubble tube 80 at a curved surface indicated by reference numeral 81a. There is. In this way, the bubble tube 8
0 is the clamping piece 8 of the lid body 74 inside the casing body 72
1, and a heat insulating air layer 88 is formed between the casing body 72 and the vial 80, making it difficult for heat from the casing side to be transferred to the vial 80. In addition, when assembling the vial 80 to the clamping piece 81, the vial 80 can be assembled to the lid body 74 with one touch by inserting the vial 80 from the tip side of the clamping piece 81. .

An aluminum lining member designated by reference numeral 100 in FIG. 7 is disposed on the inner surface of the casing body 72 so as to surround the vial 80. As shown in FIG. 8, the lining member 100 is made of a rectangular aluminum plate with notches at two corners (the notches are indicated by reference numeral 101), an area 102 corresponding to the side surface of the casing body, and a rear end. A region 103 corresponding to the side wall 72a is vertically raised to form a frame shape, and a hole 106 is formed in the bottom region 104 of the lining member 100 from which a heat staking projection on the bottom side of the casing body 72 can protrude. In addition, a U-shaped notch 105 is formed in a region 103 corresponding to the rear end side wall 72a of the casing, and a tongue-shaped region 107 surrounded by this notch 105 is bent to open the opening 72b.
An opening 108 having the same size as the heat dissipating protrusion 1 is formed and protrudes outward from the opening 72b on the casing side.
07a is formed.

When the bulb 41 is turned on with the spirit level 70 attached to the extension part 5 of the reflector 4,
Heat from the bulb 41 as a heat source is transmitted to the bubble tube 80 via the reflector 4° extension 5 and the level casing 71, both of which have poor thermal conductivity. The amount of heat transferred to the casing body 72 is inversely proportional to the length of the heat transfer path, and a difference occurs in each region of the casing body 72.

However, an aluminum lining member 100 with good thermal conductivity is disposed inside the casing body 72, and this lining member 100 with good thermal conductivity smoothes the difference in the amount of heat transferred in each region. That is, since the lining member 100 with good thermal conductivity transfers the same amount of heat to the long heat transfer path region as to the short heat transfer path region, the lining member 100 has good thermal conductivity.
The difference in the amount of heat generated in each region of 00 becomes small. Furthermore, as described above, the vial 80 is held in a suspended state within the lining member 100 by the clamping piece 81, and there is a heat insulating air layer 88 between the lining member 100 and the vial 80.
exists. Therefore, this heat insulating air layer 88 acts to insulate the heat transmitted to the bubble tube 80 via the lining member 100 and further smoothes the heat. That is, the lining member 1
The heat smoothed at 00 is insulated by the heat insulating air layer 88, further smoothed, and transmitted to the bubble tube 80. Therefore, the amount of heat transferred to the vial 80 is made uniform in the longitudinal direction, and the temperature difference between the front and rear ends of the vial 80 is small. Therefore, convection due to temperature difference does not occur in the bubble tube 80 as in the conventional case, and there is almost no movement of bubbles.

Next, the case of assembling this level 70 to the reflector 4 will be explained with reference to FIG.

First, the lining member 100 is inserted into the casing body 72, and a protrusion (not shown) on the bottom side of the casing is made to protrude into the hole 106 for protruding the protrusion for thermal caulking. Next, the tips of the projections are heat caulked to tightly fix the lining member 100 inside the casing body 72. Next, the bubble tube 80 is supported by the clamping piece 81 of the lid 74, and the rear end of the lid 74 is lance-engaged with the side wall 73a at the rear end of the casing.
The front end of the lid body is screwed to the boss portion 76 using an adjustment screw 78 to form an integrated level 70. Next, the bracket part 73 of the casing 71 is attached to the boss part 5a on the reflector side.
Align this bracket part 73 with the mounting screw 73.
A is screwed to the boss portion 5a. and spirit level 7
After the installation of reflector 0 on the upper wall is completed, when the reflector 4 is tilted vertically, that is, when the irradiation angle of the headlamp is at the appropriate position in the vertical direction, the bubble 84 of the spirit level 70 will move to the linear scale 82. Adjust using the adjustment screw 78 so that the scale is at the zero point position 82a. As shown in FIG. 6, an opening 93 is also formed in the area of the lamp body 2 corresponding to the spirit level 70, and a peephole 90 for reading the scale is formed therein. The amount of inclination indicated by the spirit level 70 can be read.

Next, the procedure for adjusting the inclination measuring device 50, 70 when the headlamp is assembled to the vehicle body, and the procedure for adjusting the illumination angle of the headlamp 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 position of the reference line 52a, the light distribution characteristics in the left and right direction of the headlamp are at the appropriate position, and the second Level 70 which is an inclination measuring device
When the bubble 84 reaches the zero point position 82a of the linear scale 82, the vertical light distribution characteristics of the headlamp are set to be at the appropriate position.

and these first and second inclinometers 50.70
When a headlamp with a built-in headlamp is assembled to the vehicle body,
Due to various errors, the scale display of each inclinometer is not in the correct position. Therefore, it is necessary to adjust the scales of the first and second inclination measuring devices to an appropriate state.

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

In the first inclination measurement device 50, the vehicle is placed on a horizontal location, a light distribution screen is set at a predetermined position in front of the vehicle, and the headlamps are turned on. Then, turn the adjustment screw 20 to adjust the light distribution of the headlamp to a predetermined position in the left and right direction on the light distribution screen (so that the irradiation axis of the headlamp coincides with the axle). However, at this time, the reference line position 52a does not match the scale zero point position 62a due to variations in the lamp mounting surface on the vehicle body side. Then, the support member 52 is rotated by a screwdriver and moved back and forth in the axial direction, so that the zero point position 62a of the scale of the first inclination measuring device coincides with the reference line position 52a. In this way, when the lateral illumination angle of the headlamp is at the appropriate position, the first inclined side 50
The scale of the reference line position 52a of the meter is adjusted so as to display the zero point.

On the other hand, in the level 7o which is the second inclination measuring device,
Rotate the adjustment screw 30 to adjust the hot zone of the headlamp to a predetermined position on the light distribution screen in the vertical direction. However, due to variations in the lamp mounting surface on the vehicle body side, the bubble position may not match the zero point position 82a of the scale 82. In such a case, the adjustment screw 78 is rotated to adjust the bubble so that it comes to the zero point position 82a of the scale. In this way, when the vertical illumination angle of the headlamp is at an appropriate position, the bubble of the level gauge 70, which is the second inclination measuring device, is adjusted so as to display the zero point 82a of the scale.

After that, the user must adjust the illumination angle of the headlamp. Then, when looking into the headlamp from above the upper side wall of the front lens 6, you can see that the reference line position 52a of the first inclination measuring device 50 does not indicate the zero point position 62a of the scale, or that the level 70 that is the second inclination measuring device If the bubble deviates from the zero point position 82a of the scale, the amount of inclination of the lamp body in the horizontal or vertical direction, that is, the deviation in the irradiation angle of the headlamp in the horizontal or vertical direction, can be read from these deviations. be able to. In such a case, the adjusting screws 20 or 30 are rotated so that the zero point position 62a of the scale is aligned with the reference line position 52a of the first inclination measuring device 50, and the zero point position 62a of the second inclination measuring device is adjusted. Some level gauges 70 are adjusted so that the bubbles are at 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.

10 and 11 show modified examples of the aluminum lining member disposed inside the casing of the spirit level of the first embodiment, as shown in FIGS. 10(a) and 11(b). The inner lining member 100A has a thickness (t<t) toward the rear end.
21 t3 < t 4) to increase the heat conductivity toward the rear end of the spirit level, further smoothing the amount of heat transfer in each area of the lining member 100A, and further reducing the temperature difference in the longitudinal direction of the vial. That is.

Moreover, the lining member 100B shown in FIG. 11 is made of aluminum die-casting, and the number of uneven grooves 110 formed on the inner side of the wall surface is increased toward the rear end to increase the surface area, and the heat dissipation is improved toward the rear end of the lining member. This is intended to further smooth the amount of heat transfer in each region of the lining member 100B and further reduce the temperature difference in the longitudinal direction of the bubble tube.

FIG. 12 shows another embodiment of the present invention, in which a level casing (casing main body) 72A is integrally molded on the upper wall of the 27-28 reflector 4, and the extension part in the previous embodiment is 5 is the level casing body 72A
It is integrated with. Then, by assembling the lid 74 with the bubble tube 80 assembled to the casing 72A, the level 70A can be attached to the reflector 4. The rest is the same as the embodiment described above, so the same reference numerals are given and the explanation thereof will be omitted.

In the embodiments described so far, the case has been explained in which the spirit level 70°7OA is installed at a position protruding rearward from the reflector 4, but as shown in FIG. The present invention can be similarly applied to a structure in which the reflector 4 is attached to the upper wall of the reflector 4 without using the extending portion 5. That is, the rear end 7 of the spirit level 70
Since point 0b is close to the valve 41, the amount of heat transferred from the reflector 4 is greater than that from the front end 70a of the spirit level which is far from the valve 41, but an aluminum lining member with good thermal conductivity is provided inside the casing body. Therefore, the amount of heat transfer within the casing body is smoothed, and furthermore, the heat is insulated by the insulating air layer around the bubble tube, and the heat is further smoothed and transferred to the bubble tube.

FIG. 14 shows an embodiment in which the present invention is applied to a unit movable headlamp in which the reference member is a lamp housing and the tilting member is a lamp body reflector unit (hereinafter referred to as a lamp body unit). .

A first inclination measuring device 250 measures the inclination of the lamp body unit in the left-right direction and the inclination of the lamp body unit in the up-down direction in a horizontal plane including the horizontal swing axis Lx of the upper wall 202a of the lamp body unit 202. Second
A level gauge 270, which is an inclination measuring device, is provided respectively. The first inclinometer 250 includes a transparent support member 52
is attached to the mounting surface on the lamp housing 200 side via a holding member 252, and the rod member 54 provided with a scale is urged into contact with a vertical wall 204 projecting from the upper wall 202a of the lamp body unit. The contact surface 204a of the rod small diameter portion 61 of the vertical wall 204 is a curved surface centered on the water skewer axis Lx, so that it is not affected by the vertical tilting of the lamp body unit. Further, the level gauge 270, which is the second inclination measuring device, has the same structure as the level gauge 70 shown in the first embodiment, and is attached to the extension part 205 formed to protrude from the upper wall 202a of the lamp body unit. is fixed. In addition, code 240 is a bulb socket, code 2
47 is a locking cap for fixing the bulb socket 240 to the socket hole.

The other configurations are the same as those of the movable flapper type described above, and the explanation thereof will be omitted by giving the same reference numerals.

In addition, in the above-described embodiment, the lining member was 100° and 100A.
, 100B has a transverse U-shape and is arranged in close contact with the inside of the casing body, but the lining member may be arranged only in the bottom region inside the casing body.

Further, in the embodiment described above, the lining member 100 is disposed inside the casing of the spirit level. ``1'OOA and 10OB have been explained as being made of aluminum, but the lining material is not limited to aluminum, and may be made of zinc, iron alloy, or other metals with good thermal conductivity.Furthermore, synthetic resin with thermal conductivity may be used. The material is not limited to metal as long as it is a material with high thermal conductivity mixed with aluminum powder or the like to increase the thermal conductivity.

〔Effect of the invention〕

As is clear from the above explanation, in the automobile headlamp according to the present invention, the reference member of the tilting member (the beam reflector for the movable reflector type, the lamp body/reflector unit for the unit movable type; the same applies hereinafter) (The lamp body for the movable reflector type, the lamp housing for the movable unit type. The same applies hereinafter.) The vertical inclination with respect to the lamp body is determined by a level, and from this level the amount of vertical inclination of the tilting member, that is, the headlamp. The amount of vertical tilt of the illumination angle can be read.

To adjust the vertical illumination angle of the headlamp, all you have to do is adjust the aiming by tilting the 31- tilting member vertically so that the bubble in the spirit level is at the specified position. The illumination angle of the lamp can be adjusted in the vertical direction.

In addition, the temperature of the atmosphere around the level changes depending on whether the bulb is lit or not, and the amount of heat transferred to each area of the level casing also varies depending on the length of the heat transfer path from the heat source. The lining members with good thermal conductivity, which are placed opposite each other inside the casing, transfer approximately the same amount of heat to the long areas of the heat conduction paths as to the short areas of the heat conduction paths.
The amount of heat transfer in each region within the casing is smoothed.

For this reason, there is almost no difference in the amount of heat transferred to the vial via the lining member in each area of the vial, and the entire liquid filling in the vial exhibits an approximately uniform temperature change, making it difficult to fill the vial as in the conventional case. There is no problem of air bubbles moving due to the temperature difference between the liquids.

Therefore, it is possible to obtain a headlamp with a spirit level that has less measurement error caused by external temperature changes, and it is possible to accurately adjust the vertical illumination angle of the headlamp.

Furthermore, in claim (2), since an insulating air layer is formed between the lining member of the spirit level and the vial, this insulating air layer insulates the heat transmitted from the lining member to each region of the vial. and is further smoothed, so that the vial filling liquid exhibits uniform temperature changes. Therefore, it is possible to obtain a headlamp with a spirit level that has almost no measurement error due to external temperature changes, and it is possible to more accurately adjust the irradiation angle in the vertical direction of the headlamp.

Further, in claim (3), since the heat transfer path to the level casing is limited to the support portion, the heat transferred to the level is reduced accordingly, and the heat-resistant strength structure of the bubble tube can be made that much more relaxed. .

[Brief explanation of drawings]

Fig. 1 shows an embodiment in which the present invention is applied to a reflector-movable headlamp, and Fig. 2 is a front view of the lamp, Fig. 2 is a plan view of the lamp, and Fig. 3 is along the line ■-■ shown in Fig. 1. FIG. 4 is a cross-sectional view taken along the line IV-mV shown in FIG. 1, and FIG. Figure 6 is a longitudinal cross-sectional view of the area around the assembly of the level, which is the second inclination measuring device, and Figure 7 is a cross-sectional view taken along the line Vl-Vl shown in Figure 1. Fig. 8 is an exploded view of the lining member placed inside the casing, Fig. 9 is an enlarged vertical sectional view of the level, and Fig. 10 (a) is the level. Plan view of a modified example of the lining member placed inside the casing of the vessel, FIG. 10(b)
is a sectional view taken along the line XX shown in FIG. 10(a),
12 is a vertical sectional view of another modified example of the lining member disposed inside the casing of the level; FIG. Fig. 13 is a vertical sectional view of the vicinity of the level assembly part, which is the main part of still another embodiment of the present invention, and Fig. 14 is a partially cutaway view of an embodiment in which the present invention is applied to a unit movable headlamp. FIG. 15 is a plan view of the headlamp shown in FIG. 2... Lamp body which is a reference member, 4... Reflector which is a tilting member, 5... Rearward extension part of the reflector, 5a... Boss part which is a supporting part of a spirit level, 6... - Front lens, 10... Ball joint as a swinging fulcrum of the reflector, which is a tilting member. 20...Adjustment screw 30 for adjusting the tilting of the reflector, which is a tilting member, in the left-right direction.Adjustment screw 50, for adjusting the tilting of the reflector, which is a tilting member, in the vertical direction.250...Headlamp A first inclination measuring device for measuring the inclination of the irradiation angle in the left and right direction, 70.70A, 27
0...Level which is a second inclination measuring device for measuring the inclination of the vertical illumination angle of the headlamp, 72.72A...Casing body of the level, 80...
・Bubble tube, 84...Bubble, 88...Insulating air layer surrounding the bubble tube, 100.10
OA, 100B...Lining member, 200...Lamp housing which is a reference member, 202...Lamp body refu 35-36-lid unit which is a tilting member, 205...Lamp body reflector unit. Rear extension part, Lx...horizontal axis, Ly...vertical axis. Applicant: Koito Seisakusho Co., Ltd. 37- =82-

Claims (5)

[Claims] (1) In an automotive headlamp with a movable tilting member, the irradiation angle of the headlamp can be adjusted by tilting the tilting member vertically and horizontally with respect to a reference member of the headlamp, wherein the tilting member is A spirit level is installed at a predetermined position to measure the vertical slope of the illumination angle of the headlamp. A headlamp for an automobile, characterized in that a lining member with good thermal conductivity is arranged opposite to a bubble tube. (2) The vial is supported on the back side of the lid of the spirit level, the lining member is arranged along the inside of the casing, and an insulating air layer is formed between the lining member and the vial. The automobile headlamp according to claim (1), characterized in that: (3) The automotive head according to claim (1) or (2), wherein the casing of the spirit level is spaced apart from the tilting member via a supporting portion formed protruding from the tilting member. lamp. (4) The automobile headlamp according to any one of claims (1) to (3), wherein the reference member is a lamp body, and the tilting member is a reflector that can be tilted within the lamp body. (5) According to any one of claims (1) to (3), the reference member is a lamp housing, and the tilting member is a lamp body reflector unit having a reflector integrally formed on the inner peripheral surface. Automotive headlamp listed.