JPH0427041Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a light source bulb mounting structure for a lamp that removably holds the light source bulb.

[Prior Art] An example of a conventional light source bulb mounting structure of this type will be described with reference to FIGS. 3 and 4.

This example concerns a light source bulb for an automobile lamp. In the figure, reference numeral 1 denotes a reflector having a paraboloid of revolution reflecting surface 10 on the front side, and a through hole 11 provided in the center thereof.

Reference numeral 2 denotes a valve holder, which has a cylindrical shape with a stepped portion 20 in the middle, and is open at the end on the large-diameter cylindrical portion side. On the other hand, the end portion on the side of the small-diameter cylindrical portion has a small diameter in the form of an inner flange, and an opening 21 is provided therein. This valve holder 2
Protrusions 22 and 23 of rectangular and semicircular shapes for preventing incorrect assembly are provided on the inner surface of the housing. Moreover, a small protrusion 24 is provided on the inner surface of the flange-shaped portion (near the small diameter opening 21). Attachment pieces 25 are provided protrudingly on both sides of the opening edge of the large-diameter cylindrical portion of this valve holder 2, and a support portion 26 is provided on one of the two attachment pieces 25, and a support portion 26 is provided on one of the two attachment pieces 25, and the attachment piece 25 is connected to the other attachment piece 25. A stop portion 27 is provided. The small-diameter cylindrical portion of the valve holder 2 is inserted into the through hole 11 of the reflector 1, and the mounting piece 25 of the valve holder 2 is fixed to the reflector 1 with bolts (not shown).

Reference numeral 3 denotes a spring formed by bending piano wire.The spring 3 has its middle portion bent into a U-shape to form a supported portion 30, and both side portions of the supported portion 30 bent into a dogleg shape to form an intermediate portion. A pressing portion 31 is formed at the end of the locking portion 31, and a tip end portion of one of the two pressing portions 31 is bent into an L shape to form a locked portion 32.

The supported portion 30 of the spring 3 is rotatably supported by the support portion 26 of the valve holder 2.

4 is a light source bulb, and this light source bulb 4 is a glass bulb 40 in which a filament (not shown) is sealed.
and a cap 41 provided at the rear of the glass tube 40.
The cap 41 includes a flange 42 provided at an intermediate portion of the cap 41, and a terminal 43 protruding rearward from the rear end of the cap 41. Square and semicircular notches 44 and 45 for preventing incorrect assembly are provided in the flange portion 42 of the light source bulb 4 in correspondence with the projections 22 and 23 of the bulb holder 2 described above. While inserting the glass bulb 40 of the light source bulb 4 into the reflector 1 through the inner flange-shaped small diameter opening 21 of the bulb holder 2, insert the notches 44 and 45 provided in the flange 42 into the protrusion 2 of the bulb holder 2.
2 and 23, and the flange 42 of the light source bulb 4
The front side of the valve holder 2 is brought into contact with the small protrusion 24 of the valve holder 2. Next, while pressing the pressing portion 31 of the spring 3 against the rear surface of the flange portion 42 of the light source bulb 4, the locked portion 32 of the spring 3 is engaged with the locking portion 27 of the bulb holder 2.

As a result, the light source bulb 4 is attached to the bulb holder 2 removably, that is, replaceably.
At this time, the square and semicircular notches 44 and 45 are the same as the square and semicircular protrusion 2 of the valve holder 2.
2 and 23, it is possible to prevent the so-called incorrect assembly of the light source bulb 4, in which the light source bulb 4 is assembled in the wrong orientation.

When replacing the light source bulb 4, first remove the locked portion 32 of the spring 3 from the locking portion 27 of the bulb holder 2, and then turn the spring 3 to push the pressing portion 31 of the spring 3 onto the flange of the light source bulb 4. 42 and pull out the light source bulb 4 from the bulb holder 2. Next, while inserting a new light source bulb 4 into the bulb holder 2, insert the notches 44, 45 into the protrusions 22,
23, the locked portion 32 of the spring 3 is locked to the locking portion 27 of the bulb holder 2, and the flange portion 42 of the light source bulb 4 can be attached to and detached from the bulb holder 2 by the pressing portion 31 of the spring 3. Attach to.

FIG. 5 is a single item diagram of the light source bulb 4.

40 is the aforementioned glass tube, and the filament 46 is housed in it.

41 is a base, 42 is a flange for attachment, and 43 is a terminal.

Light emitted from the filament 46 toward the spherical portion at the base of the glass tube 40 as indicated by arrow a is asymmetrically refracted and becomes scattered light.

In order to prevent the above-mentioned scattered light, a flange-shaped light shielding plate 47 is provided.

The light shielding plate 47 described above is connected to the opening 21 shown in FIG.
The diameter of the mounting flange 42 is larger than that of the opening 21.

[Problems to be Solved by the Invention] However, the conventional light source bulb mounting structure described above has a protrusion 22 on the inner peripheral surface of the small diameter cylindrical portion of the bulb holder 2 near the edge of the opening 21 to prevent incorrect assembly. 23, as shown by the two-dot chain line in Figure 3,
The flange portion 42 of the light source bulb 4 is connected to the above-mentioned protrusion 22 or 2.
3 and the light source bulb 4 may float.
If the light source bulb 4 floats, it will cause problems in terms of light distribution and safety standards, and heat resistance conditions will also change.
It is overheated by radiant heat from the dotted chain line position).

In particular, in the case of automobile lamps, when replacing the light source bulb, the part shown in FIG. The risk of the light source bulb lifting up increases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light source bulb mounting structure that can reliably prevent the light source bulb from lifting during the light source bulb replacement work.

[Means for Solving the Problems] The mounting structure of the present invention created to achieve the above object has a small diameter opening in the form of an inner flange at one end of the cylindrical part, and A light source bulb including a bulb holder having a protrusion to prevent incorrect assembly, a flange having a diameter larger than the small diameter opening, and a flange-shaped light shielding plate for preventing scattering light having a diameter smaller than the small diameter opening. The large-diameter flange is provided with a notch that fits into the protrusion to prevent incorrect assembly, and the light source is provided with a spring that presses the large-diameter flange toward the inner flange. The present invention is applied to a valve mounting structure, and a guide protrusion is provided on the edge of the small diameter opening of the inner flange.

The shape of the guide protrusion is configured so that it protrudes toward the outer periphery of the light shielding plate for preventing scattering of light of a properly attached light source bulb. In this state, the guide protrusion and the light shielding plate may be in contact with each other, or may be close to each other and separated from each other.

[Function] When the above-mentioned guide protrusion is provided, when the flange of the light source bulb tries to ride on the protrusion for preventing incorrect assembly, the light shielding plate interferes with the guide protrusion and prevents the above-described run-on operation.

When the light shielding plate of the light source bulb interferes with the guide protrusion, if the light source bulb is inserted into the bulb holder while the light shielding plate is in sliding contact with the guide protrusion, there is no risk that the flange will ride on the incorrect assembly prevention protrusion. The flange portion fits tightly inside the small diameter opening of the inner flange and is installed in the correct position.

[Embodiment] FIG. 1 shows a light source bulb mounting structure according to the present invention, and depicts a state in which a light source bulb 4 is correctly mounted.

This embodiment is an improvement by applying the present invention to the conventional example shown in FIG.
The same drawing reference numbers as in FIG. 3 indicate the same or similar components as in the conventional example.

The difference from the conventional example is that a guide protrusion 28 that protrudes toward the inside of the reflector 1 is provided on the edge of the small-diameter opening 21 in the shape of an inner flange.

The guide protrusion 28 is arranged along the edge of the small diameter opening 21 so as not to prevent the glass tube 40 and the light shielding plate 47 from being inserted into the small diameter opening 21.
The tip thereof is configured to be close to the outer periphery of the light shielding plate 47 (it does not matter if it is in contact with it).

FIG. 2 is an explanatory view of the operation of the above embodiment, but for convenience of explanation, a situation that cannot actually occur is also schematically depicted.

When the one end N portion of the flange 42 of the light source bulb of this example attempts to ride on the protrusion 22 for preventing incorrect assembly, the light shielding plate 47 interferes with the guide protrusion 28 . Second
In the figure, the flange 42 is shown riding on the protrusion 22 to prevent incorrect assembly, ignoring the above-mentioned interference.
Since the light shielding plate 47 is pushed back in the direction of arrow r by the guide protrusion 28, the entire light source bulb 4 is prevented from tilting counterclockwise as shown in FIG.

In this way, the center line z'- of the light source bulb 4
z' is automatically aligned with the optical axis zz of the reflector 1 (corresponding to the center line of the bulb holder 2).

Looking at this with reference to FIG. 3, the light source bulb 4 is prevented from tilting as shown by the two-dot chain line and is maintained in the position shown by the solid line.

In this way, the flange of the light source bulb is prevented from riding up (that is, the light source bulb is lifted up),
Even if you have to fumble around when replacing the light source bulb, you can install it correctly.

[Effects of the invention] As explained above, according to the mounting structure of the invention, even if the light source bulb is replaced by groping, the mounting collar will not ride on the protrusion to prevent incorrect assembly and the light source bulb will float. There is no risk of the device being installed in a crooked shape, and it can be easily installed in the correct state.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of a light source bulb mounting structure according to the present invention, and FIG. 2 is an explanatory view of the operation of the above embodiment. FIG. 3 is a sectional view showing a conventional lamp, FIG. 4 is a bottom view, and FIG. 5 is an explanatory diagram of a light source bulb. 1...Reflector (light fixture body), 2...Bulb holder, 22, 23...Protrusion for preventing incorrect assembly, 28
. . . Guide protrusion, 3 . . . Spring, 4 .

Claims (1)

[Claims for Utility Model Registration] (a) A valve holder having a small diameter opening in the form of an inner flange at one end of a cylindrical part, and a protrusion on the inner surface of the cylindrical part to prevent incorrect assembly; (b ) a light source bulb including a flange having a larger diameter than the small diameter opening and a flange-like light blocking plate for preventing scattering light having a smaller diameter than the small diameter opening; (c) the large diameter flange; is provided with a notch to prevent incorrect assembly that fits into the projection, and (d) a light source bulb mounting structure including a spring that presses the large-diameter flange toward the inner flange-shaped portion, (e) at least one guide protrusion is provided on the edge of the inner flange-shaped small-diameter opening; (f) when the light source bulb is attached to the bulb holder, the guide protrusion is provided with a flange-like shape for preventing light scattering; A mounting structure for a light source bulb, characterized by having a shape that projects toward the outer periphery of a light shielding plate.