JPS6396864A - Valve for lamp apparatus without light shielding plate and head lamp using the same - Google Patents

Abstract

(57) [Abstract] 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 provides an improved lamp bulb that can block unnecessary light flux without providing a light shielding plate, and a lamp bulb that can block unnecessary light flux without providing a light shielding plate. The present invention relates to a headlamp for a vehicle that utilizes the optical characteristics of the above-mentioned lamp bulb.

[Prior art]

A conventional vehicle headlamp of this type will be explained with reference to FIGS. 9 to 13. (Refer to Japanese Unexamined Patent Publication No. 57-105955.) Reference numeral 1 in FIG. 9 is an H4 type valve, the details of which are shown in FIG. 10. This bulb 1 has a main filament (filament for traveling beam) 11 and a sub-filament (filament for passing beam) 12 in a glass tube 10 parallel to the optical axis (bulb axis> The sub-filaments 12 are disposed at the front, respectively, and the sub-filaments 1
A shielding plate 13 is disposed below the glass bulb 10, a light shielding film 14 such as paint is provided on the front end of the glass bulb 10, and a cap 15 is provided on the rear end of the glass bulb 10. 16u, 1
6d is a metal rod supporting the filament, 16u is located above the filament, and like 16d, it is located below.

Reference numeral 2 shown in FIG. 9 is a reflector that reflects the light from the bulb 1 forward.The reflector 2 in this example is a movable type, and the base 15 of the bulb 1 is placed in the center of the reflector 2. is installed. The fin filament 11 is located slightly below the focal point of the reflecting surface in the shape of a paraboloid of revolution of the reflector 2, and the sub-filament 12 is located ahead of the focal point along the optical axis XX of the reflecting surface. do. This is a lens that refracts the reflected light from the three-beam lefter 2 in FIG. 9, and is attached to the front opening of the housing 4. A lamp chamber is defined by the lens 3 and the housing 4, and a bulb 1 and a reflector 2 are housed within the lamp chamber.

To explain the operation of this vehicle headlight, when driving at night, the main filament 11 is turned on to irradiate the driving beam far away, and when passing an oncoming vehicle, the sub-filament 12 is turned on to prevent glare from oncoming cars. Emits a passing beam.

In such vehicle headlights, when passing an oncoming vehicle at night, in order not to give glare to the oncoming vehicle and to obtain forward visibility when passing each other, a passing beam as shown in Fig. 13 is used. The light distribution pattern is standardized. The light distribution pattern shown in No. 13I2I is a light distribution pattern when cars drive on the left side like in Japan (note that when cars drive on the right side like in Europe, the left and right sides are reversed), and the horizontal center line In the first quadrant ■ above H-H and to the right of the vertical center line V-V, the irradiation light is cut so that it does not cause glare to oncoming vehicles, and the horizontal center line H-H In the second quadrant ■ above and to the left of the vertical center line v-■, the irradiated light is cut so that it rises in a triangular shape by the cut line L, so that forward visibility is obtained when passing an oncoming vehicle. Further, below the horizontal center &I H-H, irradiation light exists in the third quadrant (2) on the left of the vertical center line V-V and in the fourth quadrant (2) on the right to obtain downward visibility. The light distribution pattern of the passing beams that is standardized by cutting the irradiation light in this way is called a cut pattern.

In order to obtain the above-mentioned cut pattern, a conventional vehicle headlamp is equipped with a light shielding plate 13. FIG. 11 shows the light shielding plate 13
In order to explain the structure, a sectional view perpendicular to the optical axis XX (coinciding with the center line of the tube 10) is shown.

The light shielding plate 13 has a substantially semicircular cross section, and its left shoulder 13L
(W4 on the left side when facing the irradiation direction) is the subfilament H2
The sub-filament 12 It is located below. In such a conventional vehicle headlamp, the light emitted from the subfilament 12 is blocked by the light shielding plate 13 within an angle φ. Since this sub-filament 12 is located in front of the focal point of the concave reflector 2, the light distribution (basic light distribution) that remains reflected by the reflector 2 is as shown in FIG. The top and bottom, left and right sides are reversed. In other words, there is no irradiation light in the first quadrant ■, and in the second quadrant ■, there is no irradiation light below the cut line L that extends at an angle of θ0 from the center with respect to the designed horizontal center line H'-H'. There is irradiation light, and further, in the third quadrant (2) and fourth quadrant (2), there is irradiation light that spreads in a fan shape over the third and fourth quadrants (2) and (2). The right shoulder of this basic light distribution (along the designed horizontal center line H'-H') is limited by the left shoulder 13L of the light shielding plate 13, and the left shoulder of the basic light distribution (along the horizontal center line H'-H' in design) is limited by the left shoulder 13L of the light shielding plate 13. ) is limited by the right shoulder 13R of the light shielding plate 13. As a result, the above-mentioned cut pattern is obtained in the conventional vehicle headlamp.

[Problem that the invention attempts to solve]

However, the above-mentioned conventional vehicle headlights have the following problems.

(5) The sub-filament 12 while lit is easily deformed due to its high temperature, and if the vehicle is subjected to vibrations or shocks such as when driving on a rough road, there is a risk that the sub-filament 12 may swing greatly into a vertically curved shape and come into contact with the light shielding plate 13. There is. The subfilament 12 is the light shielding plate 1
3, the electric flow path is short-circuited and the sub-filament 12 is fused.

(bl A light shielding plate 13 is placed below the sub-filament 1-12.
As a result, the basic light distribution shown in Fig. 12 was obtained, and as a result, the cut pattern shown in Fig. 13 was obtained, but on the other hand, the luminous flux within the angle φ shown in Fig. This reduces the effective utilization rate of luminous flux.

The present invention was created as a result of comprehensive research on both of the above-mentioned problems (a) and (b1). A lamp bulb that can form the required power and throat line for light, and a light flux that can form a desired light distribution pattern (Fig. 13) by utilizing the optical characteristics of the lamp bulb according to the above invention. The purpose is to provide a headlamp with a high effective utilization rate.

[Means for solving problems]

In order to achieve the above object, the first invention according to the present application (a lamp bulb without a light shielding plate) fixes both ends of a filament to at least two metal rods parallel to the center line of a glass bulb. In addition, a light source bulb for a lamp is improved in which a light shielding means is provided at the tip of the glass tube, and when this light source bulb is put into use, one of the at least two metal rods is a glass tube. The filament is located at approximately the same height as the center line of the light shielding means, and the other one is located obliquely below the center line. Assuming that the two metal rods are arranged so as to intersect the conical surface, and the two metal rods are not provided with light shielding plates.

Further, the second invention according to the present application (a headlamp using a light bulb without a light shielding plate) exclusively utilizes the optical characteristics of the light bulb without a light shielding plate according to the first invention. In a vehicle headlamp in which a light source bulb is provided near the focal point of a concave reflector and a main lens is attached covering the front opening of the concave reflector, the light source bulb is located at the center of the glass bulb. A filament is attached between at least two metal rods parallel to the line, and a light shielding means is applied to the tip of the glass tube, and one of the at least two metal rods is approximately parallel to the center line of the glass tube. The at least two filaments are positioned at the same height, and the other one is positioned obliquely below the center line. The metal rods are arranged so as to intersect with the above-mentioned conical surface, and the structure is such that no light shielding plate is attached to these two metal rods, and the light emitted from the filament is transmitted between the two metal rods. Among the light beams that pass through the concave mirror and are reflected by the concave mirror, a transfer means for refracting the upward light beam in a downward direction, and a drive means for arbitrarily retracting and restoring the transfer means are provided.

[Effect]

According to the configuration of the first invention (a lamp bulb without a light shielding plate), since there is no light shielding plate, there is no possibility that the sub-filament will come into contact with the light shielding plate and cause a short circuit. Since the rod is also arranged so as not to be below the sub-filament, there is no risk of it coming into contact with the metal rod and causing a short circuit.

Moreover, the metal rod blocks part of the light from the subfilament to form a cut line.

Further, according to the configuration of the second invention (a headlight using a lamp bulb without a light shielding plate), the cant line is formed by being blocked by the metal rod of the lamp bulb according to the first invention. By using this, the light beam directed above the cut line is refracted downward by the prism, and this refracted light beam can be effectively utilized.

〔Example〕

1 to 3 show an embodiment of a lamp bulb without a light shielding plate according to the first invention, FIG. 1 is a perspective view, and FIG. 2 is a plane perpendicular to the optical axis XX. Cross-sectional view drawn by cutting, 3rd
The figure is a partial plan view.

In the present invention, the metal rods, which are disposed above and below the subfilament 12 in the conventional example, are disposed on the left and right sides. In this example, 16r is a metal rod (right), and 16ff is a metal rod (left). A short metal rod (middle) 16c is provided in parallel with these, and the sub-filament 12 is installed between the left and right metal rods 1 (i6, 16r), and the metal rod (left) 161 and metal rod (middle) 1
The main filament 11 is attached between the main filament 6c and the main filament 11.

As shown in FIG. 2, the metal rod (right) 16r is placed on the right side of the central axis of the glass tube lO (which almost coincides with the central axis of the sub-filament 12), and at approximately the same height. establish. In this example, the upper end of the metal rod 16r is brought into contact with the designed horizontal center line H'-H'. Also, as shown in the figure, the metal rod (left) 161 is installed obliquely below the center line of the glass tube 10 with an angle of depression θ' with respect to the horizontal center line H'-H'. It is.

FIG. 3 is a plan view of the vicinity of the tip of the glass tube 10.

Assume a cone C having the front end of the subfilament 12 as its apex and touching the rear edge of the light shielding film 14. Said left and right metal rods 1
The tip of 61.16r is arranged so as to intersect with this cone C. This is to prevent a part of the light beam emitted from the sub-filament 12 from leaking between the metal rod and the light-shielding film.

FIG. 4 shows an embodiment of a headlamp using a vehicle lamp without a light shielding plate according to the second invention. This embodiment is an improvement by applying the present invention to the conventional headlamp shown in FIG. 9, and the same drawing reference numbers as in FIG. are similar components, and this fourth
1' shown in the figure is a lamp bulb 1' without a light shielding plate according to the first invention shown in FIG.

An inner lens 6 is provided below the optical axis XX as a transfer means.

The above-mentioned inner lens 6 refracts light directed upward as indicated by arrow A downward as indicated by the arrow. The above-mentioned inner lens 6 is held via a support/driving means 20, and can also be tilted forward from the illustrated upright position to assume a horizontal position (shown by a phantom line) 6' and retreated from the light beam. Fifth
The figure shows details of the aforementioned bearing and drive means 20, 21.2
1' is a bearing, 22 is a motor, 23 is a crank arm, 2
4 is a link.

As shown in Figure 2, the left and right metal rods 161 and 16r
are arranged on both sides of the subfilament 12, so
A portion of the light emitted from the subfilament 12 is blocked. As a result, when the inner lens shown in FIG. 4 is tilted to the 6' position, the basic light distribution becomes as shown in FIG. 6.

16L shown with spots corresponds to the part shaded by the metal rod L61, and 16R corresponds to the part shaded by the metal rod 16r. In this way, an upper fan-shaped zone Lu and a lower fan-shaped zone Ld are formed.

The cut angle θ1 of the left shoulder of the fan-shaped zone Ld is determined by the angle θ' shown in FIG.

When the inner lens 6 is erected as shown by the solid line in FIG. 4, upward light is refracted downward by this lens, so the basic light distribution pattern shown in FIG. 6 changes as shown in FIG. 7. , the fan-shaped zone Lu descends to the Lu' position and overlaps with the fan-shaped zone Ld.

This basic light distribution is adjusted using the main lens 3 (Fig. 4) to create the 8th light distribution.
The light distribution pattern shown in the figure is obtained. The luminous flux of the fan-shaped zone Lu' is projected in the vicinity shown with spots in FIG. 8, and the central luminous intensity is increased. In this way, the luminous flux that was wasted by being blocked by the light shielding plate 13 (FIGS. 10 and 11) in the prior art is effectively utilized.

In addition, when the inner lens is tilted as shown by the imaginary line 6' in Fig. 4, the basic light distribution shown in Fig. 6 is used as is, illuminating the front and illuminating the area above the horizontal line H-H on the oncoming lane side. You can. Note that the transfer means is not limited to the above example, and may, for example, be configured such that the lower side of the reflector 2 is divided and the divided portions are configured to be movable up and down via a drive means.

〔Effect of the invention〕

As explained above, in the lamp bulb without a light shielding plate according to the present invention, the filament contacts the light shielding plate.

There is no risk of shorting and disconnection. Further, the headlamp using the non-shielding lamp bulb according to the present invention exclusively utilizes the optical characteristics of the above-mentioned light-shielding lamp bulb, and has a high luminous flux efficiency.

[Brief explanation of the drawing]

1 to 3 show an embodiment of a lamp bulb without a light shielding plate according to the first invention, FIG. 1 is a perspective view, FIG. 2 is a sectional view, and FIG. 3 is a view of the vicinity of the tip. FIG. 4 to 8 show an embodiment of a headlight using a light bulb without a light shielding plate according to the second invention, FIG. 4 is a vertical sectional view including the optical axis, and FIG. 5 is a vertical sectional view including the optical axis. A perspective view of the support and drive part of the inner lens, FIGS. 6 and 7 are explanatory diagrams of the basic light distribution,
FIG. 8 is a chart showing a light distribution pattern of light projection. Fig. 9 is a sectional view of a conventional headlamp, Fig. 10 is a perspective view of a conventional lamp bulb, Fig. 11 is a sectional view of the conventional lamp bulb, and Fig. 12 is the conventional example. FIG. 13 is an explanatory diagram of the basic light distribution of the headlight, and FIG. 13 is a chart showing the light distribution pattern of the light projection. 2... Reflector, 3... Main lens, 4... Lamp housing, 6... Transfer means, 10... Glass tube, 11... Main filament, 12... Sub filament, 13 ... Light shielding plate, 14 ... Light shielding film, 1
6u, 16d, 16r, 161...metal rod. Figure 2 V Figure 4 Figure 6 Figure 7'y V Figure 8 Figure 10 Figure H Figure 1J12 Figure 13z tIV

Claims (1)

[Claims] 1. A light source bulb for a lamp, in which both ends of a filament are fixed to at least two metal rods parallel to the center line of the glass tube, and a light shielding means is provided at the tip of the glass tube. When this light source bulb is placed in a state of use, one of the at least two metal rods is located approximately at the same height as the center line of the glass tube, and the other one is located at an angle to the center line. Further, the at least two metal rods are arranged to intersect with the conical surface, assuming that the front end of the filament is the apex and the conical surface is in contact with the rear edge of the light shielding means. A bulb for a lamp without a light shielding plate, characterized in that the light shielding plate is not attached to the at least two metal rods. 2. In a vehicle headlamp in which a light source bulb is provided near the focal point of a concave reflector and a main lens is attached covering the front opening of the concave reflector, the light source bulb is located near the center line of the glass bulb. A filament is attached between at least two metal rods parallel to the glass tube, and a light shielding means is applied to the tip of the glass tube, and one of the at least two metal rods is parallel to the center line of the glass tube. Position it at the same height,
The other one is positioned obliquely below the center line, and furthermore, the at least two metal rods are connected to the conical surface, assuming that the front end of the filament is the apex and the conical surface is in contact with the rear edge of the light shielding means. These two metal rods shall be arranged so as to intersect with the surface, and shall have a structure in which no light shielding plate is attached to these two metal rods.
and a transfer means for refracting an upward light beam in a downward direction among the light beams emitted from the filament, passed between the two metal rods, and reflected by the concave mirror, and the transfer means is optionally retracted and refracted. A headlamp using a lamp bulb without a light shielding plate, characterized in that it is provided with a driving means for restoring its original state.