JPH03201301A - vehicle headlights - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an anti-fog window formed in an inner lens of a vehicle headlamp, which includes an outer lens and an inner lens.

[Prior art]

In a vehicle headlamp, light from a light source is reflected by a reflector, and the reflected light passes through an inner lens and an outer lens and is projected to the outside of the lamp with a desired light distribution. The inner lens is provided between the outer lens and the reflector opening. The lamp is positioned so that the internal space of the lamp is divided into an outer lens side space and a reflector space.

[Problem to be solved by the invention]

If the rain space between the outer lens side space and the reflector space is sealed, or the passage connecting the rain space is narrow,
Heated air cannot flow freely, causing cloudiness inside the inner and outer lenses. This cloudiness causes the light from the bulb to be scattered, causing harmful glare to oncoming vehicles, and preventing the proper amount of light from flowing. In some cases, driving was impaired due to the inability to obtain sufficient energy.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a vehicle headlamp that can prevent fogging inside the inner lens and the outer lens.

[Means to solve the problem]

The present invention has been made to achieve the above objects,
Provided between the outer lens and the reflector opening,
An anti-fog window is formed in the upper part of an inner lens positioned to divide the interior space of the lamp into an outer lens side space and a reflector space, or an inner lens integrally formed with a hood.

[Effect]

By forming an anti-fog window on the inner lens, it is possible to improve air circulation between the outer lens side space and the reflector space, allowing heated air to actively convect, thereby reducing the temperature difference between the inside and outside of the inner lens. can be made smaller, and at the same time, the temperature of the outer lens side space can be prevented from becoming too high compared to the temperature outside the lamp. This can prevent fogging inside the inner lens and outer lens.

〔Example〕

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

FIGS. 1 to 18 show a four-lamp combination headlamp as an example of a vehicular lamp, which is mounted on the left side of a vehicle (the left side when viewed from the driver's seat). Figure 1 is a front view, Figure 2 is a top view, Figure 3 is a bottom view, Figure 4 is a side view (center side of the vehicle), Figure 5 is a rear view, and Figure 6 is a horizontal section of Figure 1. (A-A cross section) Figure 7 is D-D in Figure 1.
A sectional view, Fig. 8 is a BB sectional view of Fig. 1, and Fig. 9 is a sectional view of Fig. 1.
10 is a GC sectional view of FIG. 1,
Fig. I1 is a sectional view taken along E-C in Fig. 1, Fig. 12 is a sectional view taken along F-C in Fig.
Figure 4 is a TT cross-sectional view of the construction drawing, and Figure 15 is a cross-sectional view of M-- of Figure 1.
16 is a sectional view taken along line N-N in FIG. 1, and FIG. 17 is a sectional view taken along line Q-C in FIG. 1.

A high beam lamp 6 and a low beam lamp 8 are provided inside the lamp body 4 attached to the vehicle body 2 (see FIG. 6). Both lamps 6.8 have reflectors 14.16 which reflect the light emitted by the respective lamp bulb 10.12. reflector 14,
16 is the aiming mechanism 18.20 for the lamp body 4
It is attached through a , and can be rotated through a small predetermined angle to change its posture. The reflected light is
The light is projected forward through the inner lens 22 or the condensing lens 24 with a predetermined light distribution or range. The low beam lamp 8 uses a shade 17 to block unnecessary light for a light distribution pattern that satisfies the light distribution standards of each country, and the remaining light passes through a condenser lens 24. The condensing lens 24 is attached to a holder 26 with respect to an elliptical reflecting mirror which is a reflector 16.
It is integrally attached via. A protector 28 is provided in front of the condenser lens 24 to protect the side portions from the heat of the condenser lens 24.
is attached to the inner lens 22. The inner lens 22 is used not only in front of the high beam lamp 6, but also in front of the high beam lamp 6.
It also exists in front of the clearance lamp 30 that exists at the side end of the combination headlamp (see FIG. 13).

An outer lens 32 is provided in front of the inner lens 22 and condensing lens 24, and is continuous with the curved surface of the outer surface of the vehicle body, forming a part of the entire curved surface of the designed vehicle.

Each part will be explained in detail below.

(Reflector) A parabolic reflecting mirror is used as the reflector 14 in the high beam lamp 6 (FIG. 11), and an elliptical reflecting mirror is used as the reflector 6 in the low beam lamp 8 (FIG. 8). At the center of each reflector 14, 16, a bulb insertion hole 34°, 34' is provided for inserting each lamp bulb 10, 12. Further, a shade 17 is provided in front of the reflector 16 to block part of the light from the lamp bulb 12 to obtain a predetermined light distribution with a cut line. Each reflector 14, 16 is attached to the lamp body 4 via an aiming mechanism 18, 20. Each aiming mechanism 18°20 (Fig. 7, Fig. 9, Fig. 10)
12) includes one fulcrum portion 36.36' that supports the reflectors 14, 16 rotatably in all directions, and two adjustment support portions 38.36' that support the reflectors 14, 16. 38', and supports the reflector 14° 6 at three points. Fulcrum part 36°36'
(Fig. 7, Fig. 12) shows the spherical parts 42, 42' formed at the tip of the rod-shaped pivot 40.40' provided on the lamp body 4 side, and the spherical part 42, 42' that surrounds the spherical part 42. It consists of a pivot receiver 44, 44' which is attached to the 14 and 16 sides of the reflector. This fulcrum portion 36.
36' serves as a fulcrum, so to speak, when the reflectors 14, 16 change their postures. Adjustment support part 38.38' (9th
Fig. 10) shows adjusting screws 46, 46' that are rotatably provided through the lamp body 4, and screws that are screwed onto the tips of the adjusting screws 46 and 46' and attached to the reflectors 14, 16 side. It consists of a self-locking nut 48.48 which is fixed. The adjusting screw 46° 46' is integrally formed with a flange 50.50' in contact with the back side of the lamp body 4, and a fastener 54 press-fitted into an integrally formed groove 52.52'.
54' contacts the inside of the lamp body 4 and sandwiches the lamp body 4. Thereby, the adjusting screw 46, 46' does not move axially relative to the lamp body 4 even if it rotates. Self-locking nut 4
8.48' is an adjusting screw 46.46 that is provided on the reflector 14, 16 side and is screwed together.
'The tip of ' is self-locking nut 48 by the rotation.
．． 48' can be moved axially. By moving the two adjusting screws 46 and 46' separately, the reflectors 14 and 16 can change their posture in the horizontal plane and around the axis assumed in the left-right direction of the vehicle body.

By changing the posture in this way, the aim of the projected light can be finely adjusted.

(Lamp bulb) Bulb insertion holes 34 and 34 of the reflectors 14 and 16
The lamp bulbs 10 and 12 are respectively inserted into the lamps from the rear (FIGS. 6, 8, and I1). A set spring 56, 56' is provided for the insertion of the lamp bulb. That is, a set spring 56 is provided with one end rotatably attached to the edge of the valve insertion hole 34, 34'.
Push and bend the other end of the set spring 56' with your fingertips, and insert the set spring 56.
56' is locked. As a result, set spring 5
The central part of 6.56' presses the flange 58.58' of the lamp bulb 10.12 from the rear, and the bulb insertion hole 34
, 34' against the edge of the lamp bulb 10.12.
It is designed to be fixed. Lamp bulb 10.
There is a base 60.60 behind the flange 58.58' of 12.
Electric power is supplied from a terminal 62.62' provided on the base 60.60', so that the filament within the lamp bulb 10.12 emits light.

(Inner Lens) The inner lens 22 is provided on the opening side of each of the reflectors 14 and 16 with respect to the high beam lamp 6 (FIGS. 6 and 11) and the clearance lamp 3o (FIG. 13). This inner lens 22 is integrally molded from transparent polycarbonate resin, and as shown in FIG. 6, a hole 64 for attaching the protector 28 is opened in a portion corresponding to the low beam lamp 8. There is. Further, a decorative frame called a hood 66 is integrally formed on the outer peripheral edge of the inner lens 22 on the high beam lamp 6 side, and a gray light-shielding coating 68 is applied to this hood portion. By integrally molding the inner lens 22 and the hood 66 in this manner, it is possible to reduce the number of parts and therefore the assembly process. Furthermore, compared to the case where the inner lens 22 and the hood 66 are formed from separate members, when viewed from the outside of the headlamp, there is no gap between the hood 66 and the inner lens 22, which improves the appearance. can. Furthermore, since there is no gap, the aiming clearance gap 70 that exists between the reflector 14 and the inner lens 22 is not visible from the outside of the headlamp, making it possible to improve the appearance. Furthermore, since there is no gap between the inner lens and the hood, light can be prevented from leaking through the gap.

In addition, the inner lens 22 divides the interior space of the lamp into an outer lens side space and a reflector space.
An air hole 72 is formed as an anti-fog window (FIGS. 1 and 10), and the inner lens 22 passes through this air hole 72.
The air trapped between the outer lens 32 and the outer lens 32 can flow into the space inside the lamp body 4. This circulation causes air convection, eliminates the temperature difference between the reflector space and the outer lens side space, and prevents fogging inside the inner lens 22 and the outer lens 32. Furthermore, the temperature difference between the inside and outside of the inner lens 22 can be reduced, and thermal deformation of the inner lens 22 can also be prevented.

To attach the inner lens 22 to the lamp body 4, as shown in FIG. 16, the inner lens 22 is fixed to the outer lens 32 with a screw 80, and as shown in FIG. This is done by engaging the sealing leg 76 provided at the end of the inner lens 22 with the sealing groove 74 for the inner lens 22 that has been formed through a sealing agent 78. At the same time, the seal leg 82 formed at the end of the outer lens 32 also has a sealant 8 against the seal groove 84 formed in the lamp body.
This is done by engaging via 6. In this manner, by integrating the inner lens 22 with the outer lens 32 in advance using the screws 80, workability during one assembly can be improved.

(Protector) The protector 28 is fitted into the hole 64 (see FIG. 6) provided at the center of the inner lens 22, and is attached from the inside with screws 88.

This protector 28 covers the space between the condenser lens and the lamp body and outer lens to protect the surroundings from the heat of the condenser lens 24, and is made of die-cast aluminum. By being made of aluminum, the protector radiates heat in the space surrounded by the condensing lens, protector, and outer lens to the outside of this space, lowers the temperature in the space, and protects the protector 28 itself and the outer lens 32. It is possible to prevent thermal deformation. Note that it is also possible to use other metals instead of aluminum, and a metal plate rolled into a cylindrical shape may also be used. This protector 28 has a substantially conical shape with the upper and lower parts cut diagonally, and a gap 90 is provided at the inner end between the protector 28 and the condenser lens 24 so that the low beam lamp 8 can be aimed. It is formed. Through this extra gap 90, the outer lens 3
The air present between the lamp body 2 and the condenser lens 24 can flow into the space within the lamp body 4.

(Holder) A holder 26 is attached with screws 92 to the front edge of the elliptical reflector, which is the reflector 16 of the eight low beam lamps. This holder 26 is made of die-cast aluminum and is used to attach the condenser lens 24. The holder 26 has a generally cylindrical shape as a whole, and a mounting bracket 94 called a lens fitting is attached to the front edge of the holder 26 with a screw 96. Mounting bracket 9
The tip of 4 is bent into an abbreviated cross-section, and this tip is
A flange portion 9 formed around the outer periphery of the condenser lens 24
It is designed to hold down the front of 8.

In this way, the reflector 16, shade 17, holder 26, mounting bracket 94, and condensing lens 24 are integrated.

(Outer Lens) The outer lens 32 is a one-piece member that covers the front of the inner lens 22 and the condenser lens 24, and is molded from transparent polycarbonate resin. This outer lens 32
The vertical cross-sectional shape of the front portion (FIGS. 7 to 11) has a continuous radius of curvature, is bent near the center in the vertical direction, and has a small radius of curvature. This bent part 10
0 is provided at a position corresponding to the condenser lens 24 (FIG. 8). This bent portion 100 functions as a lens due to its bent shape, and the condensing lens 24
This makes it possible to cancel out the chromatic aberration that exists. This chromatic aberration occurs because the condensing lens 24 has a spherical surface, and the refractive index of light of various wavelengths (light of various colors) existing in the light from the lamp bulb 12 is slightly different. Therefore, this phenomenon occurs because the focal length of the condenser lens 24 differs slightly for each color of light. Specifically, this is a phenomenon in which light, which should originally be white, turns blue. To deal with this phenomenon, as in this embodiment, the bent portion 100 acts as a lens to produce the opposite chromatic aberration, which cancels out the chromatic aberration of the condensing lens 24, making it possible to return the blue to white.

A seal leg 102 is integrally formed on the outer periphery of the outer lens 32, and by engaging with a seal groove 104 formed on the outer periphery of the lamp body 4 via a sealing agent 106, the outer lens 32 is attached to the lamp body 4. (Fig. 6, Fig. 14). In addition, at the side end that is greatly curved and narrowed and wraps around a part of the corner on the vehicle body side (
6 and 13), in order to ensure accurate assembly, a pin 108 is integrally formed on the outer lens 32 side in parallel with the seal leg 102, and the pin 108 is formed on the lamp body 4 side. Form a hole for the pin to be inserted. The convex portion 110 in which the pin hole is provided is provided on the outer side surface of the seal jR104. During assembly, the seal leg 102 is inserted into the seal groove 104 and at the same time the pin 108 is inserted into the pin hole.

Generally, the seal groove 104 has a dimensional play with respect to the seal leg 102, and this play is filled with the sealing agent 06. The sealant 106 is.

It easily softens at high temperatures and is difficult to position in the direction perpendicular to the seal leg 102. In addition to this, the side end portions of the outer lens 32 are thin and curved, making them easy to bend and easily displaced in the lateral direction of the vehicle. Therefore, in the past, positioning in the vehicle lateral direction was difficult due to the seal groove 104 and the seal leg 102, but in this embodiment, positioning can be facilitated by engaging the pin 108 and the pin hole. After assembly, as shown in FIGS. 2, 3, 5, and 11, at the boundary between the outer lens 32 and the lamp body 4, there are five curved clips called clips 112 around the headlamp. A plate-shaped spring member is provided, and clamps the protrusion 114 on the outer lens side 32 and the protrusion 116 on the lamp body 4 side by sandwiching them together (FIG. 11). This tightening, so to speak, presses the seal leg 102 in the depth direction of the seal groove ↓04, and the function of maintaining the position of the outer lens in the width direction of the seal:'glO4 is weak.

That is, there is a possibility that the outer lens 32 will shift in the lateral direction of the vehicle with respect to the lamp body 4 by the amount of the soft sealant 10G existing between the seal leg 102 and the seal groove 104. Therefore, as in this embodiment, the pin 108
By inserting the outer lens 32 into the pin hole of the convex portion 110, the outer lens 32 will not shift in the width direction. This pin 1
By providing 08 and pin holes at the headlamp side end where misalignment was likely to occur in the past, misalignment and even looseness can be prevented.
It is possible to prevent the gap between the outer lens 32 and the lamp body 4 from opening.

(Lamp Body) As described above, the engagement between the lamp body 4 and the outer lens 32 is performed by the seal leg 102 on the outer lens 32 side and the seal groove 104 on the lamp body side.

This seal groove 104 is provided outside the thick part of the lamp body 4, for example, as shown in the cross section of FIG.
A convex portion corresponding to the seal groove 104 is formed on the outside of the lamp body.

Reference numeral 122 indicates a bonnet. As shown in FIG. 6, a ventilation hole 129 is formed on the back surface of the lamp body to communicate the interior and exterior of the lamp chamber, thereby preventing the lens from fogging due to temperature differences. FIGS. 8 and 11 show communication holes 130 and 13 for the same purpose.

The lamp body 4 is attached to the vehicle body by, for example, attaching a clamp to the lamp body with a screw, and providing a protrusion on the vehicle body side with which the clamp engages. moreover,
A scattering arm 1 protrudes toward the rear of the vehicle at the central end of the lamp body 4 to make the installation more secure.
24tX--as shown in FIGS. 4, 15, and 17), the mounting arm is fastened to the vehicle body side bracket 128 with a bolt via a spring nut 126 or a fastener 127 at the tip.

〔Effect of the invention〕

As explained above, according to the vehicle headlamp of the present invention, by forming the anti-fogging window in the upper part of the inner lens, heat is generated in both the outer lens side space and the reflector space in the interior space of the lamp. This causes convection and allows the air to circulate freely, thereby preventing fogging of the inner lens or outer lens. Further, by forming the anti-fog window on the upper part of the inner lens, the anti-fog window can be made difficult to see from the outside.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the present invention, and FIG. 2 is a front view showing one embodiment of the present invention.
Fig. 3 is a bottom view of Fig. 1, Fig. 4 is a side view of the center side of the vehicle in Fig. 5, Fig. 5 is a rear view of Fig. 1, and Fig. 6 is a bottom view of Fig. 1.
The figure is a horizontal sectional view (A-A section) of FIG. 1, and FIG. 7 is a DD sectional view of the construction drawing. Figure 8 is a sectional view taken along line B-B in Figure 1, and Figure 9 is a cross-sectional view taken along line C-- in Figure 1.
10 is a GC sectional view in FIG. 1, FIG. 11 is an EE sectional view in FIG. 1, FIG. 12 is a FF sectional view in FIG. 1, and FIG. 14 is a TT sectional view in FIG. 1, FIG. 15 is an M-N sectional view in FIG. 1, and FIG. 16 is an N-N sectional view in FIG. 1. 17 is a sectional view taken along the line Q-C in FIG. 1. 6...High beam lamp, 8...Low beam lamp, 14.16...Reflector 22...Inner lens, 32...Outer lens, 66...Hood, 72...Air hole. Figure 7 Figure 0 Figure 5 Figure 6

Claims (1)

[Claims] (1) For an inner lens that is installed between the outer lens and the reflector opening and is located so as to divide the interior space of the lamp into the outer lens side space and the reflector space, or for an inner lens that is integrally formed with a hood, the upper part of the inner lens is fogged. A vehicle headlamp characterized by forming a prevention window.