JPH04115402A - Discharge valve fixing apparatus of automotive lighting apparatus - Google Patents

Abstract

PURPOSE:To prevent an optical axis from deviating by forming an abutting part which can abut on a valve metal cap at two positions in a valve inserting hole, providing a pressing part to press the metal cap to the abutting part in a locking cap, and supporting the valve metal cap in the radius direction at three points of the pressing part and the touching part. CONSTITUTION:An engaging extrusion 45 corresponding to a slit 36b of a focusing ring 36 is formed in a circular groove 44. Next, being face to face and rectangularily against the center 0 of a hole 23, a pair of flat planes 46, 46 are formed in the opposite to the extrusion 45 in the inner circumferencial plane of the circular groove 44. Then, a pressing extrusion 56 to press a metal cap main body 35 in the radius direction is formed in the periphery part of a round hole 52 of a locking cap 50. When the locking cap 50 is fitted in the rear extrusion part 40, the pressing extrusion 56 presses the metal cap main body 35 of the valve in the radius direction. At that time, the focusing ring 36 is brought into contact with the pair of the flat planes 46, 46 in the valve insertion hole side. As a result, optical axis of a lamp is prevented from differing and displacing.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a valve fixing device for fixing a valve inserted into a valve insertion hole.

[Prior Art and Problems to be Solved by the Invention] In this type of prior art, as shown in FIGS. 8 and 9, the base 6 of the bulb 5 can be engaged with the rear top of the reflector 1. A valve insertion hole 3 is formed, three bayonet parts 2a are formed on the rear protrusion 2 at the periphery of the valve insertion hole, a valve 5 is inserted into the valve insertion hole 3, and a synthetic resin is formed around the base 6. A locking cap 7 made of a variety of products is disposed, and the locking cap side engaging portion is bayonet-engaged with the bayonet portion 2a, so that the cap 6 of the valve 5 is fixed to the insertion hole 3.

However, in the conventional bulb fixing device described above, since the base 6 of the bulb 5 is not supported in the radial direction, the bulb fixing part becomes loose due to vibrations, etc., and the optical axis of the lamp may blur or shift. There is a risk of In particular, headlamps that use discharge bulbs such as metal halide bulbs as light sources have high brightness, so slight misalignment of the optical axis can lead to glare and other major problems in light distribution. .

The present invention has been made in view of the problems of the prior art,
The purpose is to provide a bulb fixing device for an automobile lamp that prevents the optical axis from wobbling or shifting by supporting the bulb base in the radial direction.

[Means to solve the problem]

In order to achieve the above object, in the bulb fixing device for an automobile lamp according to claim (1), a bulb fitting hole formed in the rear top part of the reflector is engaged with the bulb fitting hole. a discharge bulb integrally formed with a cap positioned in the circumferential direction and the optical axis direction; a rear protrusion on the periphery of the insertion hole surrounding the bulb insertion hole and having a plurality of bayonet parts formed on the outer periphery; A locking cap for fixing and holding the base of the bulb in the bulb insertion hole by bayonet-engaging with a bayonet part of a rear protrusion around the insertion hole; Abutting portions capable of coming into contact with two outer circumferences of the cap are formed at a portion that engages with the cap of the valve, and a pressing portion is formed on the locking cap to press the cap of the valve against the two contact portions. .

The valve cap is supported in the radial direction by three points: one pressing portion on the locking cap side and two contact portions on the valve insertion hole side.

Further, in claim (2), the base of the valve includes a cylindrical base body and a disc-shaped focus ring integrally formed on the outer periphery of the base body, and the base is provided with a focus ring in the shape of a disc that is formed integrally with the outer periphery of the base body. The contact part consists of a pair of flat contact surfaces that can come into contact with two places on the outer periphery of the focusing ring from diagonally downward, and the pressing part presses the base body from above when the locking cap is attached to the rear protrusion on the periphery of the insertion hole. The locking cap is formed at the periphery of the locking cap's base body insertion hole, which can be pressed.

[Effect]

The cap of the discharge bulb is engaged with the insertion hole and positioned in the circumferential direction and the optical axis direction, and the outer periphery of the discharge bulb is fitted into one pressing part on the locking cap side and two abutments on the bulb insertion hole side. It is supported by three points with the contact part.

In particular, in claim (2), the outer periphery of the mouthpiece of the discharge bulb is supported by three points: the locking cap side pressing part from above and the valve insertion hole side abutting parts from two places below.

〔Example〕

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

Figures 1 to 7 show an embodiment in which the present invention is applied to a headlamp. Figure 1 is an exploded perspective view of the area around the bulb insertion hole of the headlamp seen from the back side, and Figure 2 is an exploded perspective view of the area around the bulb insertion hole of the headlamp. A vertical sectional view of the headlamp with the discharge bulb inserted and fixed in the bulb insertion hole, Figure 3 is a front view of the rear protrusion around the bulb insertion hole, and Figure 4 is a partially cutaway view of the locking cap. 5 is a front view of the locking cap, and FIG. 5 ( ) is an enlarged sectional view of the base pressing projection formed on the locking cap (a sectional view taken along the line V-V shown in FIG. 5). , FIG. 6 is a rear view of the locking cap, and FIG. 7 is an explanatory diagram illustrating how the valve mouthpiece is supported in the radial direction by mounting the locking cap.

In these figures, reference numeral 10 denotes a container-shaped lamp body, and a light projection unit 2o is tiltably supported within the lamp body 1o by an aiming mechanism (not shown).

The light projection unit 20 includes an elliptical glue reflector 22, a discharge bulb 3° inserted into a bulb insertion hole 23 formed at the rear top of the reflector, and a projection lens 26 fixed to the front surface of the reflector. -22 has an integrated structure with a lens holder 24 attached to the front opening. The reference numeral 26a designates an annular lens fixing frame for caulking the projection lens 26 to the lens holder 24, and the reference numeral 50 designates a locking cap for fixing and holding the discharge bulb 30 in the bulb insertion hole 23.

The discharge bulb 30 has a structure in which a discharge lamp 34 is supported at both ends by a pair of long and short lead supports 32a and 32b protruding from the front surface of an insulating base 31, and the discharge bulb 30 is inserted into the bulb insertion hole 23. In the discharge lamp 34
The discharge portion 34a is located at the first focal point f1 of the reflector 22.
It is located in Further, on the front surface of the cap 31, a cylindrical ultraviolet shielding globe 38 surrounding the discharge lamp 34 is provided.
is fixedly held via the globe holding plate 39 of the ceramic disk, and the discharge part 34a and the flaper 22
It is designed to block harmful ultraviolet rays from the light directed toward the sun. Near the second focal point f2 of the reflector 22, there is a shade 25 for forming a clear cut integrally formed with the lens holder 24, and an inner lens 27 for shielding ultraviolet rays fixedly held on the lens holder 24 by a leaf spring member 27a. It is provided. and discharge lamp 3
The light emitted from the discharge section 34a of No. 4 is reflected by the reflector 22, and after converging on the second focal point f2 of the reflector 22, it is converted into parallel light by the projection lens 26 and projected forward. The inner lens 27 cuts ultraviolet rays again from the light reflected by the reflector 22 and directed toward the projection lens 26, and also cuts ultraviolet rays from the light emitted without being cut from the tip opening of the ultraviolet shielding glove 40. .

Further, the tip end 38a of the ultraviolet shielding globe 38 is positioned so as not to block the reflected light Q on the hot zone forming light reflecting surface 22a formed around the bulb insertion hole 23 of the reflector 22.

That is, an ultraviolet shielding glove 38 is placed on the optical path of the light Q□ which is reflected by the reflector 22 and contributes to the light distribution in the hot zone.
does not exist. Therefore, a portion of the light that is reflected by the reflector 22 and contributes to the light distribution in the hot zone is not blocked, so that sufficient light is distributed in the hot zone area.
A hot zone of appropriate size and sufficient luminosity is obtained.

The valve cap 31 includes a cylindrical cap body 35 and a focusing ring 3 extending in the shape of a flange around the outer circumference of the cap body 35.
6 is formed by integrally molding a synthetic resin material such as PPS, and the back side of the base body 35 has male connector terminals 32c and 32d protruding from which are integrally welded to the lead supports 32a and 32b, respectively. Connector-15
are integrally formed. The focus ring 36 has a disc shape, and the front surface of the focus ring 36 is provided with three protrusions 36a (see FIG. 2) for positioning in the optical axis direction, which are spaced a predetermined distance apart in the circumferential direction. A notch 36b for positioning in the circumferential direction that engages with an engaging protrusion 45 on the side of the valve insertion hole, which will be described later, is formed in the portion.

On the other hand, the rear end side peripheral edge of the bulb insertion hole 23 formed at the rear top of the reflector 22 protrudes rearward in a cylindrical shape.
Three bayonet parts 42 are formed on the outer periphery of this cylindrical rear protrusion 4o.

Further, a circular groove 44 for engaging a focus ring, which is slightly larger than the diameter of the hole 23, is formed at the peripheral edge of the hole 23.

Inside this annular groove 44 is a notch 36 of the focusing ring 36.
An engaging protrusion 45 corresponding to b is formed, and a pair of flat surfaces 46 and 46 are formed on the inner peripheral surface of the annular groove 44, facing the protrusion 45 and perpendicular to the center O of the hole 23. It is formed. This pair of flat surfaces 46.46 form the annular groove 44.
This is a contact portion that abuts and supports the outer periphery of the focus ring 36 engaged with the focus ring 36 from two locations below (see FIGS. 3 and 7).

The locking cap 50 is a cap-shaped integral molded body made of synthetic resin, which has a circular hole 52 formed in the ceiling surface through which the valve body 35 can be inserted, and has flange-shaped protrusions 54 formed at three locations on the outer periphery. An inner flange portion 55 is formed on the front side peripheral edge of the portion 54 over approximately half of the area in the circumferential direction of the brim-like protrusion portion 54, and this inner flange portion 55 serves as a bayonet on the side of the reflector-cylindrical rear protrusion portion 40. Bayonet engagement with the portion 42 is possible. A pressing protrusion 56 is protruded from the peripheral edge of the circular hole 52 on the ceiling surface, which comes into contact with the cap body 35 of the valve and presses the cap body 35 in the radial direction when the locking cap 50 is attached to the rear protrusion 4o. has been done. Furthermore, a rib 57 (see FIGS. 5(a) and 6) extending along the circumferential edge of the circular hole is formed on the inside of the cap on the ceiling surface, so that when the locking cap 50 is attached to the rear protrusion 40, , the focus ring 36 is inserted into the annular groove 4
It is designed to be biased and crimped to the bottom surface of 4.

Note that the reference numeral 58 is a hole necessary for forming the brim-like protrusion 54, but it also serves to increase the elasticity of the ceiling surface of the locking cap.

Next, the state in which the valve 30 is fixedly held in the valve insertion hole 23 when the locking cap 50 is attached to the rear protrusion 40 will be described.

The notch 36b is engaged with the engagement protrusion 45 to close the discharge bulb 30.
When the valve 30 is inserted into the valve insertion hole 23, the valve 30 is positioned in the circumferential direction by the notch 36b and the engagement protrusion 45. Next, the locking cap 5o is arranged from the rear of the valve body 35 so that the body 35 protrudes from the circular hole 52, and the inner flange 55 is aligned with the bayonet 42, and the locking cap 55 is rotated clockwise. direction. Then, the inner flange portion 55 slides along the bayonet portion 42, the inner flange portion 55 and the bayonet portion 42 are bayonet engaged, and the locking cap 50 is attached to the cylindrical rear protrusion portion 40. At this time, the focus ring 36 is pressed against the bottom surface of the annular groove 44 by an amount corresponding to the protrusion of the rib 57 on the locking cap side, and as a result, the three protrusions 36a of the focus ring 36 are pushed into the annular groove 44.
The bulb 30 is positioned in the longitudinal direction of the optical axis by being pressed against the bottom surface of the bulb. Also, the pressing protrusion 56 on the locking cap side
7, press the valve body 35 in the radial direction (downward).

As a result, the focus ring 36 comes into contact with the pair of flat surfaces 46.46 on the side of the bulb insertion hole, and the focus ring 36, that is, the base body 35 is brought into contact with the pair of flat surfaces 46.46 in FIG.
2. It receives a radial reaction force (diagonally upward reaction force) as shown by P2. In this way, the base body 35 is
6 and a pair of flat surfaces 46, 46, the valve 30 is held fixed in the radial direction as well.

In FIG. 2, reference numeral 12 denotes a lighting circuit housing unit that houses a lighting circuit (not shown) for a discharge bulb, and a cylindrical extension 13 is formed in an opening 11 formed at the rear top of the lamp body 10. A female connector 1 is integrated through the connector and is connected to a lead wire extending from the lighting circuit.
4 is connected to a male connector 15 that is integrally formed on the back side of the base body 35. Reference numeral 16 denotes a synthetic resin decorative plate disposed around the projection lens 26 of the light projection unit 20, and its surface is painted silver to improve its appearance when the headlamp is not lit.

Further, reference numeral 18 is a lens assembled and integrated into the front opening of the lamp body 10.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the base of the discharge bulb is positioned in the optical axis direction and the circumferential direction, and has one pressing part on the locking cap side and two abutments on the bulb insertion hole side. Since the bulb is supported in the radial direction at three points with the contact portion, the bulb is reliably held fixed three-dimensionally, eliminating the problem of optical axis wobbling or misalignment.

[Brief explanation of drawings]

Figure 1 is an exploded perspective view of the vicinity of the bulb insertion hole of the headlamp, seen from the rear side, Figure 2 is a vertical sectional view of the headlamp with the discharge bulb inserted and fixed in the bulb insertion hole, and Figure 3 is a front view of the rear protrusion of the periphery of the valve insertion hole, Fig. 4 is an enlarged perspective view of the locking camp partially cut away, Fig. 5 is a front view of the locking cap, and Fig. 5 (, ) is the locking cap. Enlarged sectional view of the nozzle pressing protrusion formed in (
6 is a rear view of the locking cap, and FIG. 7 is an explanatory diagram illustrating how the valve cap is supported in the radial direction by installing the locking cap. , FIG. 8 and FIG. 9 are diagrams showing a conventional valve fixing device. 45...Engaging protrusion on the valve insertion hole side for positioning the valve in the circumferential direction. 46...Flat surface on the annular groove side which is the abutting part on the valve insertion hole side that comes into contact with the valve cap, 50-... Locking cap, 55 Inner flange part on the locking cap side, 56. Radius of the valve cap A pressing protrusion that is a pressing part on the locking cap side that presses in the direction. 22...Reflector-123...Valve insertion hole, 30
...Discharge bulb, 31...Bulb base, 3
5...Base body, 36...Focus ring, 36
a...Protrusions 36a and 36b on the valve metal side for positioning the bulb in the optical axis direction, 36b...notches on the pulp pro gold side for positioning the bulb in the circumferential direction, 40...rear protrusion of the insertion hole periphery, 42... Bayonet part, 44... Annular groove on the side of the bulb insertion hole for positioning the bulb in the optical axis direction, Patent applicant: Koito Seisakusho Co., Ltd. Patent attorney
Hide Yagi Hitoshi Kata Haku Be Satoshi Figure Figure Figure Figure b Figure

Claims (2)

[Claims] (1) A discharge bulb that is integrally formed with a bulb insertion hole formed at the rear top of the reflector and a base that engages with the bulb insertion hole and is positioned in the circumferential direction and the optical axis direction;
An insertion hole peripheral rear protrusion surrounding the valve insertion hole, which has a plurality of bayonet parts formed on its outer periphery, is bayonet-engaged with the bayonet part of the insertion hole peripheral rear protrusion to open the valve cap. In a bulb fixing device for an automobile lamp, the locking cap is fixedly held in an insertion hole, and a portion of the bulb in the bulb insertion hole that engages with the bulb cap is capable of abutting two places on the outer periphery of the cap. The locking cap is formed with a pressing portion that presses the mouthpiece of the valve against the two abutting portions, one pressing portion on the locking cap side and two on the valve insertion hole side. 1. A bulb fixing device for an automobile lamp, characterized in that a bulb base is supported in the radial direction by three points including two abutting portions. (2) The cap of the bulb consists of a cylindrical cap body and a disc-shaped focus ring integrally formed on the outer periphery of the cap body, and the abutting portion in the bulb insertion hole is of the focus ring. It consists of a pair of flat contact surfaces that can come into contact with two places on the outer periphery diagonally from below, and the pressing part can press the cap body from above when the locking cap is attached to the rear protrusion on the periphery of the insertion hole. Claim (1) characterized in that the locking cap is formed on the periphery of the base body insertion hole of the locking cap.
) The bulb fixing device for the automotive lamp described in ).