JPH10208506A - Lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attach a light source bulb to a reflector with high accuracy. SOLUTION: A little gap is formed between the internal circumference surface of a large diameter through hole 22 and the outer circumference surface of a guard part 12 of a discharge lamp 1, a protruding part 4 for centering is formed on the internal circumference surface of a large diameter through hole 22, and a cylinder pressing part 5 is formed with a spring 3. As a result the cylinder pressing part 5 of the spring 3 presses the cylindrical part 13 of the discharge lamp 1 towards the protruding part 4 for centering and makes the outer circumference surface of the guard 12 touch the centering protruding part 4, then the center axle of the discharge lamp 1 aligns to the optical axis and the centering of the discharge lamp 1 is achieved and the discharge bulb 1 is capable of attaching accurately to the reflector 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp in which a light source bulb such as a discharge lamp is detachably attached to a reflector via a spring. The present invention relates to a vehicular lamp that can be attached to a vehicle with high accuracy.

[0002]

2. Description of the Related Art A vehicle lamp of this type generally includes a light source bulb, a reflector for reflecting light from the light source bulb forward, and a spring for detachably attaching the light source bulb to the reflector. The light source bulb,
It is composed of a light emitting section, a flange provided on the rear side of the light emitting section, and a tubular section provided on the rear side of the flange. The reflector has a through hole for inserting the light emitting unit from the rear side to the front side, and an inner peripheral surface of the through hole, and a small diameter through hole on the front side and a large diameter through hole on the rear side through a step portion. , A spring mounting portion and a spring engaging portion. The spring includes a mounting portion rotatably mounted on the spring mounting portion, an engaging portion detachably engaged with the spring engaging portion, and a flange pressing portion pressing the flange. It is configured.

[0003] Then, the light emitting portion of the light source bulb is inserted from the rear side to the front side into the through hole of the reflector, and the flange portion and the cylindrical portion of the light source bulb are set in the large diameter through hole of the reflector.
In addition, the front surface of the flange is brought into contact with the receiving portion of the reflector. Then, when the engaging portion of the spring is engaged with the spring engaging portion of the reflector while the flange pressing portion of the spring is in contact with the rear surface of the flange portion, the flange pressing portion elastically contacts the rear surface of the flange portion. The front surface of the flange is pressed against the receiving portion. As a result, the light source bulb is detachably attached to the reflector via the spring.

[0004]

In the vehicle lamp described above, it is important that the light source bulb be accurately mounted on the reflector. In particular, when the light source bulb is a high-intensity discharge lamp, it is necessary to attach the light source bulb with higher accuracy.

It is an object of the present invention to provide a vehicular lamp in which a light source bulb can be centered and the light source bulb can be mounted on a reflector with high accuracy.

[0006]

According to the present invention, a small gap is provided between the inner peripheral surface of the large-diameter through hole of the reflector and the outer peripheral surface of the flange of the light source bulb. The centering portion of the light source bulb is provided on at least one of the inner peripheral surface of the large-diameter through hole and the outer peripheral surface of the flange portion, and the spring presses the cylindrical portion toward the centering portion side. And a cylindrical pressing portion for centering the light source bulb.

As a result, the light source bulb is centered by the cylinder pressing part of the spring pressing the light source bulb toward the centering part side via the cylinder part, so that the light source bulb is mounted on the reflector with high accuracy. be able to.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicular lamp according to an embodiment of the present invention. In the drawings, some parts are omitted from hatching for the sake of reading the drawings. In the figure, reference numeral 1 denotes a light source bulb. The light source bulb 1 uses a discharge lamp (for example, a high-pressure metal vapor discharge lamp such as a metal halide lamp) as an example. As shown in FIG. 4, the discharge lamp 1 includes a glass bulb 11 having a light emitting unit 10, a disk-shaped flange 12 provided on the rear side of the glass bulb 11, and a rear side of the flange 12. And a cylindrical tubular portion 13 provided at the bottom. The glass bulb 11, the flange 12, and the cylinder 13 are connected to a central axis O-
It is concentric about O, and the light emitting section 10 is on the central axis OO.

On the front surface of the flange portion 12, three hemispherical small convex portions 14 are integrally provided at equal intervals. A rectangular recess 16 is provided at the upper portion of the flange 12 (on the side opposite to the power supply wire 15) for preventing vertical assembly. Further, a connector portion 17 is provided at a rear portion of the cylindrical portion 13.
Is provided. A connector (not shown) on the power supply side is detachably connected to the connector section 17.

In FIG. 1, reference numeral 2 denotes a reflector for reflecting light from the light emitting portion 10 of the discharge lamp 1 to the front side.
As shown in FIGS. 2 and 3, the reflector 2 has a concave mirror on the front surface or the inner surface side (for example, a vertical cross section in FIG. 3 forms an elliptical surface, and a horizontal cross section (not shown) forms a paraboloid or deformed paraboloid). Consists of twenty. As a result, the reflector 2 has the first
It has a focal point F and a second focal point (a focal line on a horizontal section) not shown. In the drawing, Z-Z is the optical axis of the concave mirror 20.

The front part of the reflector 2 is open, and the light emitting part 10 of the discharge lamp 1 and the glass bulb 11 are inserted into the rear part of the reflector 2 from the outside rear to the front side of the concave mirror 20 (see FIG. 1). Circular holes 21 and 22 are formed.

An annular receiving portion on the inner peripheral surface of the through hole 21 of the reflector 2 and between the front small diameter through hole 21 and the rear large diameter through hole 22 via a step portion. (Step portion) 23 is provided. At the upper part of the inner peripheral surface of the large-diameter through hole 22, a square convex portion 24 for preventing erroneous vertical assembly is provided.

Further, a spring mounting portion 25 of a concave groove is provided on the upper surface of the rear surface (peripheral edge of the large-diameter through hole 22) of the reflector 2.
Are provided, and two spring engaging portions 26 are provided at a lower portion. As shown in FIG. 12, the two spring engagement portions 26 have a substantially U-shape with a front side and an inside opened when viewed from the lower surface.

In the drawing, reference numeral 3 denotes a spring. As shown in FIGS. 2, 3 and 7, this spring 3
A mounting portion 30 formed by bending a spring member of a round bar to form an intermediate U-shape, and two flange pressing portions formed by expanding both sides of the mounting portion 30 outward and curving forward in a hemispherical shape. Part 31, two engagement parts 32 whose ends of the two flange pressing parts 31 are narrowed inward and parallel to each other, and the ends of the two engagement parts 32 are curled. And two photographing sections 33.

The mounting portion 30 of the spring 3 is set on the spring mounting portion 25 of the reflector 2 described above, and an earth terminal 34 is set thereon, and the earth terminal 34 is fixed to the reflector 2 by a screw 35. The mounting portion 30 of the spring 3 is mounted on the reflector 2 so as to be rotatable around the axis of the intermediate portion of the mounting portion 30. In the figure, reference numeral 36 denotes a ground wire connected to the ground terminal 34.

When the above-described discharge lamp 1 is detachably attached to the reflector 2 via the spring 3, first, FIG.
As shown in FIG. 3, the spring 3 is located at a position outside the large-diameter through hole 22 of the reflector 2. next,
As shown in FIG. 5 and FIG. 6, the recess 16 for preventing vertical assembly of the discharge lamp 1 and the projection 24 for preventing vertical assembly of the reflector 2, and the semicircular recess 18 of the discharge lamp 1 and the half of the reflector 2 are provided. The light emitting part 10 and the glass bulb 11 of the discharge lamp 1 are connected to the through-hole 21 of the
22, the light-emitting part 1 of the discharge lamp 1
0 and the glass bulb 11 are positioned on the concave mirror 20 side of the reflector 2.

At this time, the fitting of the recess 16 for preventing erroneous assembly of the discharge lamp 1 vertically and the projection 24 for preventing erroneous assembly of the reflector 2 prevents the lamp 1 from being erroneously assembled to the reflector 2 upside down. And the mounting position of the discharge lamp 1 with respect to the reflector 2 can be determined.
The rotation of the discharge lamp 1 with respect to the reflector 2 is stopped. In addition, the outer diameter of the flange portion 12 (the inner diameter of the large-diameter through hole 22 of the reflector 2) is the same even if the type of the discharge lamp 1 is different depending on the standard. For this purpose, the semicircular recess 18 of the above-described discharge lamp 1
By changing the position where the semicircular projection 27 of the reflector 2 is provided for each type of the discharge lamp 1, the semicircular recess 1 of the discharge lamp 1 is formed.
The fitting of the discharge lamp 1 of a different type to the reflector 2 can be prevented by fitting the semi-circular projection 27 of the reflector 2 with the semicircular projection 27 of the reflector 2.

Further, the flange 12 and the cylindrical portion 13 of the discharge lamp 1 are set in the large-diameter through-hole 22 of the reflector 2, and the small projection 14 on the front surface of the flange 12 of the discharge lamp 1 is received by the reflector 2. The discharge lamp 1 is temporarily set on the reflector 2 by contacting the unit 23. Then, as shown in FIGS. 7 and 8, the spring 3 is positioned on the rear side of the discharge lamp 1 (reference numeral 32 in FIG. 12).
A). Further, as shown in FIG. 9, the two photographing portions 33 of the spring 3 are photographed with a finger or the like, and the two engaging portions 32 are moved in the direction of the arrow in FIG. Then, the two flange pressing portions 31 are applied to the rear surface of the flange 12 while narrowing each other inward from the two spring engaging portions 26 (see reference numeral 32B in FIG. 12). Then, as shown in FIGS. 10 and 11, the two engagement portions 32 are respectively engaged with the two spring engagement portions 26 (see reference numeral 32C in FIG. 12).

Then, the two flange pressing portions 31 are
Each of the three small convex portions 14 on the front surface of the flange portion 12 is pressed against the receiving portion 23. as a result,
The discharge lamp 1 is detachably attached to the reflector 2 via the spring 3 in a state where the front and rear positions of the light emitting unit 10 of the discharge lamp 1 and the focal point F of the reflector 2 are determined. Here, it is important to attach the discharge lamp 1 to the reflector 2 with high accuracy. In particular, when a high-intensity discharge lamp 1 is used as a light source bulb as in this embodiment, it is necessary to mount the discharge lamp 1 with even higher precision.

Therefore, the vehicle lamp according to the present invention in this embodiment comprises, as shown in FIGS. 5 to 11, an inner peripheral surface of a large-diameter through hole 22 of the reflector 2 and a flange 12 of the discharge lamp 1. And a slight gap is provided between the outer peripheral surface of the main body. Further, two hemispherical small convex portions 4 as centering portions are provided in a lower portion (a portion opposite to the spring mounting portion 25 of the reflector 2) of an inner peripheral surface of the large diameter through hole 22. I have. As shown in FIG. 2, the two centering projections 4
They are provided at intervals of a central angle of 90 ° about the optical axis Z-Z (at intervals of 45 ° left and right with respect to a vertical line). In addition, from the vertices of the two centering projections 4 to the optical axis Z
-Z to the radius A of the collar 12 of the discharge lamp 1 described above.
And almost the same.

On the other hand, the above-mentioned spring 3 is provided with a cylindrical pressing portion 5 having a shape convexly curved inward. As shown in FIGS. 7, 9, and 10, the cylindrical portion pressing portion 5 is provided closer to the mounting portion 30 than the flange portion pressing portion 31 of the spring 3. As shown in FIG. 10, the cylinder pressing portion 5 overlaps the inside of the cylindrical portion 13 when the engagement portion 32 is engaged with the spring engagement portion 26 (FIG. 10). 10 (see dash-double-dot line).
As a result, when the engaging portion 32 of the spring 3 is engaged with the spring engaging portion 26 of the reflector 2, the cylindrical portion pressing portion 5 always keeps the discharge lamp 1 as shown by the arrow in FIG.
Is pressed against the two centering projections 4 side,
The outer peripheral surface of the flange 12 of the discharge lamp 1 is brought into contact with the two centering projections 4.

The vehicle lamp according to the present invention in this embodiment has the above-described configuration. Therefore, when the discharge lamp 1 is temporarily set on the reflector 2 (see FIGS. 5 and 6), the spring 3 is engaged. By engaging the portion 32 with the spring engaging portion 26 of the reflector 2 (see FIGS. 7 to 12), the flange pressing portion 31 of the spring 3 connects the flange 12 of the discharge lamp 1 to the reflector 12 as described above. The discharge lamp 1 is attached to the reflector 2 with the front and rear positions between the light emitting unit 10 of the discharge lamp 1 and the focal point F of the reflector 2 being fixed.

On the other hand, the cylindrical portion pressing portion 5 of the spring 3 presses the cylindrical portion 13 of the discharge lamp 1 toward the two centering convex portions 4 so that the outer peripheral surface of the flange portion 12 of the discharge lamp 1 is formed. Since the two lamps are brought into contact with the two centering projections 4, the centering of the discharge lamp 1 is performed. That is, as shown in FIG. 1, the flange portion 12 of the discharge lamp 1 is pressed against two reference surfaces 6 having an opening angle of 90 ° in the direction of the arrow in the figure, and the outer peripheral surface of the flange portion 12 is formed into two reference surfaces. When brought into contact with the surface 6, the two contact points (the flange 12
The point of intersection of two perpendiculars 61 from the outer peripheral surface and the two reference surfaces 6 is the center of the flange 12 (the central axis Z- of the discharge lamp 1).
Z). The distance A between the two reference surfaces 6 and the two perpendiculars 61 is the radius A of the flange 12. Accordingly, two centering projections 4 having a center angle of 90 ° and having a distance A to the optical axis Z-Z substantially equal to the radius A of the flange 12 are provided with the flanges of the discharge lamp 1. By contacting 12 as described above, the optical axis ZZ matches the central axis OO of the discharge lamp 1, that is, the centering of the discharge lamp 1 is performed.

As described above, the front-back position between the light emitting section 10 of the discharge lamp 1 and the focal point F of the reflector 2 is determined, and the optical axis Z
Since −Z coincides with the central axis OO of the discharge lamp 1, the light emitting unit 10 of the discharge lamp 1 can be arranged at a predetermined position, for example, at the focal point F of the reflector 2 with high accuracy.

Further, in this embodiment, the discharge lamp can be formed only by providing the centering convex portion 4 on the inner peripheral surface of the large-diameter through hole 22 of the reflector 2 and the cylindrical portion pressing portion 5 on the spring 3. Since one centering mechanism is configured, no other separate parts are required.

In the above-described embodiment, the centering convex portion 4 is provided on the inner peripheral surface of the large-diameter through hole 22 of the reflector 2, but is provided on the outer surface of the flange 12 of the discharge lamp 1 or on the large-diameter. Through hole 2
Centering portions may be provided on both the inner peripheral surface of the second member and the outer surface of the flange portion 12.

In the above embodiment, the concave mirror 20 of the reflector 2 has a single reflecting surface.
A compound reflecting surface such as a so-called multi-reflector (the reflecting surface is divided into a plurality (a plurality of portions) by design with respect to the reference paraboloid of revolution, and the focal length of each portion is slightly changed or the optical axis direction is slightly changed. May be used.

Further, in the above-described embodiment, the project type headlight has been described. However, the vehicular lamp of the present invention can be used for other ordinary headlights. Further, the vehicle lamp of the present invention can also be used for a headlight for an automobile, a front sign lamp (linear motor car) for a railway vehicle, and the like.

Further, in the above-described embodiment, the discharge lamp 1 is used as a light source, but another light source (for example, an incandescent lamp such as a halogen lamp) may be used.

Furthermore, in the above-described embodiment, the portion (the through holes 21, 22, the receiving portion 23, etc.) for attaching the discharge lamp 1 to the reflector 2 is provided integrally with the reflector 2. The part may be a separate component such as a holder, and the holder or the like may be fixed to the reflector 2.

[0031]

As is apparent from the above description, in the vehicle lamp of the present invention, a slight gap is provided between the inner peripheral surface of the large-diameter through hole of the reflector and the outer peripheral surface of the flange of the light source bulb. A centering portion of the light source bulb is provided on at least one of the inner peripheral surface of the large diameter through hole and the outer peripheral surface of the flange portion, and the spring is pressed toward the centering portion side of the cylindrical portion to center the light source bulb. Since the cylinder pressing portion is provided, when the cylinder pressing portion of the spring presses the light source bulb toward the centering portion side via the cylindrical portion, the light source bulb is centered. Can be attached to the reflector with high precision.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a basic concept showing an embodiment of a vehicular lamp of the present invention.

FIG. 2 is a rear view of a portion of the reflector to which a discharge lamp is attached.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a side view of a discharge lamp as a light source bulb.

FIG. 5 is a partial rear view of a state where a discharge lamp is temporarily set on a reflector.

FIG. 6 is a sectional view taken along line VI-VI in FIG. 5;

FIG. 7 is a partial rear view in a state where a spring is located on a rear side of the discharge lamp.

FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 7;

FIG. 9 is a partial rear view of a state before the engaging portion of the spring is engaged with the spring engaging portion of the reflector.

FIG. 10 is a partial rear view showing a state where the engaging portion of the spring is engaged with the spring engaging portion of the reflector.

11 is a sectional view taken along line XI-XI in FIG.

FIG. 12 is a partial bottom view showing a state where an engagement portion of a spring is engaged with a spring engagement portion of a reflector.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Discharge lamp (light source bulb), 10 ... Light emitting part, 11 ... Glass bulb, 12 ... Flange part, 13 ... Cylindrical part, 14 ... Small convex part, 1
5: power supply wire, 16: recess for preventing vertical assembly error, 17: connector, OO: center axis, 2: reflector, 20: concave mirror, 21: small diameter through hole, 22: large diameter through hole,
23 ... receiving part, 24 ... convex part for preventing vertical assembly error, 25 ...
Spring mounting portion, 26: spring engaging portion, F: focal point (first focal point), ZZ: optical axis, 3: spring, 30 ...
Attachment part, 31 ... flange press part, 32 ... engagement part, 33 ... shooting part, 34 ... ground terminal, 35 ... screw, 36
... Earth wire, 4 ... Centering convex part (Centering part), 5 ... Cylinder pressing part.

Claims (2)

[Claims] A light source bulb; a reflector for reflecting light from the light source bulb to a front side; and a spring detachably attaching the light source bulb to the reflector. A flange provided on the rear side of the light emitting portion, and a tubular portion provided on the rear side of the flange portion, wherein the reflector is for inserting the light emitting portion from the rear side to the front side. A through hole, a receiving portion provided on an inner peripheral surface of the through hole between the small diameter through hole on the front side and the large diameter through hole on the rear side via a step portion, A spring, wherein the spring is rotatably mounted on the spring mounting portion, an engagement portion detachably engaged with the spring engagement portion, and the flange portion. And a flange pressing portion for pressing When the engaging portion is engaged with the spring engaging portion,
The light source bulb is detachably attached to the reflector via the spring by the flange pressing portion elastically abutting against the rear surface of the flange and the front surface of the flange pressed against the receiving portion. In a vehicle lighting device, a slight gap is provided between an inner peripheral surface of the large diameter through hole and an outer peripheral surface of the flange portion, and an inner peripheral surface of the large diameter through hole, the flange portion A centering portion of the light source bulb is provided on at least one of the outer peripheral surfaces of the light source bulb, and the spring presses the cylindrical portion toward the centering portion side to center the light source bulb. A vehicle lighting device, comprising: a part pressing portion. 2. The centering portion comprises two hemispherical small protrusions, and the two centering protrusions are located on the inner peripheral surface of the large-diameter through hole on the side opposite to the spring mounting portion. The cylindrical portion pressing portion is provided on the mounting portion side, and always presses the cylindrical portion toward the two centering convex portions. The vehicular lamp according to claim 1, wherein centering of the light source bulb is performed by contacting an outer peripheral surface of the flange portion with the two centering protrusions.