JP2013020779A - Vehicular lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lamp can restraining generation of upward harmful light caused by reflection on a surface of a lower inner panel.SOLUTION: When direct light of a light source bulb 10 is incident into a prism 17 arranged on an inner face of a stepped formed part 16 of a lens frame 14 existing at a front upper part of a reflector 11, the direct light is diffused with the prism 17, and a reflected light component pointed to a front slant lower part by being reflected with the inner face of the stepped formed part 16 can be reduced. Thus, generation of the upward harmful light slantly reflected upward on the surface of the lower inner panel 3 existing in a lower front part of a projection lens 12 can be restrained.

Description

  The present invention relates to a vehicular lamp used for a headlamp, a fog lamp, etc. of an automobile, and more particularly, a projector-type vehicular lamp that condenses direct light from a light source bulb and reflected light from a reflector with a projection lens and irradiates the vehicle front The present invention relates to a vehicular lamp suitable for use in a vehicle.

  FIG. 4 shows a conventional projector-type vehicular lamp. The projector-type lamp unit 1, the outer lens 2 provided on the front side of the lamp housing, the front side periphery of the lamp unit 1 and the outer lens 2. And an inner panel (extension) 3 for decoration (for shading).

  The lamp unit 1 includes a light source bulb 10, a reflector 11 that reflects a part of the light emitted from the light source bulb 10 toward the front of the lamp, a direct light of the light source bulb 10 and a light reflected by the reflector 11 to collect the front of the lamp. A projection lens 12 that irradiates the light source, and a shade 13 that forms a predetermined light distribution pattern.

  The reflector 11 has a concave reflecting surface, and this reflecting surface is formed as a spheroidal surface having a lens central axis as a central axis or a free-form surface based on an ellipse, and a light source bulb at or near the first focal point of the reflecting surface. Ten light emitting units are provided.

  The projection lens 12 is held and fixed to the front end portion of the substantially cylindrical lens frame 14, and the reflector 11 is attached to the rear end of the lens frame 14 with fastening members such as screws at the front end of the lens frame 14. I have to.

  The shade 13 is configured in a substantially lower half of the lens frame 14, and in the illustrated example, a fixed shade 13a, a movable shade 13b that is controlled to move up and down in accordance with low beam formation and high beam formation by an actuator 15, The movable shade 13 b is disposed at the second focal point of the reflecting surface of the reflector 11.

  In the lens frame 14, the peripheral wall of the upper center portion at the rear end portion thereof is stepped in the radially outward direction. Thereby, the hot air in the lamp unit 1 can be discharged out of the unit from the open portion between the stepped molding portion 16 at the center on the upper side of the rear end portion of the lens frame 14 and the front end portion of the reflector 11.

  This similar structure is shown in Patent Document 1, for example.

JP 2004-228025 A

  For example, as shown in FIG. 4, the direct light from the light source bulb 10 is incident on the inner surface of the stepped portion 16 of the lens frame 14, and the reflected light is transmitted obliquely downward through the projection lens 12 as indicated by an arrow La. Refracts downward. When the reflected light La is incident on the lower inner panel 3 surface, the reflected light La is reflected obliquely upward in the forward direction, thereby causing upward harmful light such as glare light.

  On the other hand, in the disclosed technique of Patent Document 1, a sawtooth-like protrusion that reflects the reflected light from the reflector toward the upper side of the lamp is formed on the surface of the lower inner panel 3 described above. However, even with such a configuration, since the reflected light that has passed through the projection lens and entered the surface of the inner panel 3 is reflected upward, it cannot be said that the effect of suppressing upward harmful light is sufficient.

  Therefore, the present invention provides a vehicular lamp that can suppress generation of harmful light due to direct light reflected from the inner surface of a lens frame.

  In the vehicular lamp of the present invention, a light source bulb, a reflector having a reflecting surface that reflects light from the light source bulb forward, a projection lens that irradiates the light reflected by the reflector forward, and a projection lens, A vehicle headlamp having a frame member that holds a reflector, and diffuses light irradiated between the projection lens and the reflector, out of direct light from the light source bulb, to the frame member The main feature is that a prism portion is provided.

  Of the direct light from the light source bulb, the light irradiated between the projection lens and the reflector is diffused by the prism portion provided on the inner surface of the frame member.

  Thereby, generation | occurrence | production of the harmful light by the reflected light component which permeate | transmits a projection lens in the diagonal direction can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS Schematic cross-sectional explanatory drawing which shows one Embodiment of this invention. The perspective view which looked at the lens frame from back diagonally downward. The expanded sectional view of the A range part of FIG. The schematic cross-sectional explanatory drawing which shows the conventional structure.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a projector-type vehicular lamp that is an object of the present invention, and the same parts as those in the conventional structure shown in FIG.

  The projector-type vehicular lamp includes a projector-type lamp unit 1, an outer lens 2 provided on the front side of the lamp housing, and a decorative inner panel provided between the front side periphery of the lamp unit 1 and the outer lens 2. 3 is provided.

  The lamp unit 1 includes a light source bulb 10, a reflector 11 that reflects a part of the light emitted from the light source bulb 10 toward the front of the lamp, a direct light of the light source bulb 10 and a light reflected by the reflector 11 to collect the front of the lamp. A projection lens 12 that irradiates the light source, and a shade 13 that forms a predetermined light distribution pattern.

  The reflector 11 has a concave reflecting surface, and this reflecting surface is formed as a spheroidal surface having a lens central axis as a central axis or a free-form surface based on an ellipse, and a light source bulb at or near the first focal point of the reflecting surface. Ten light emitting units are provided.

  The projection lens 12 is held and fixed to the front end portion of a substantially cylindrical lens frame (frame member) 14, and the reflector 11 is secured to the rear end of the lens frame 14 with screws or the like at a plurality of positions on the front end. It is made to attach with a member.

  The shade 13 is configured in a substantially lower half of the lens frame 14, and in the illustrated example, a fixed shade 13a, a movable shade 13b that is controlled to move up and down in accordance with low beam formation and high beam formation by an actuator 15, The movable shade 13 b is disposed at the second focal point of the reflecting surface of the reflector 11.

  In the lens frame 14, the peripheral wall of the upper center portion at the rear end portion thereof is stepped in the radially outward direction. Thereby, the hot air in the lamp unit 1 can be discharged out of the unit from the open portion between the stepped molding portion 16 at the center on the upper side of the rear end portion of the lens frame 14 and the front end portion of the reflector 11.

  A prism portion 17 is provided on the inner surface of the lens frame 14 for diffusing light irradiated between the projection lens 12 and the reflector 11 out of direct light from the light source bulb 10.

  In the present embodiment, a prism portion 17 as shown in FIGS. 2 and 3 is provided on the inner surface of the stepped molded portion 16 at the upper center of the rear end portion of the lens frame 14.

  In the present embodiment, the prism portion 17 is provided with a plurality of kamaboko-shaped (substantially hemispherical) protrusions 17 a extending in the optical axis direction of the lamp unit 1 in the circumferential direction of the inner surface of the stepped molded portion 16. It is configured in a shape.

  According to the vehicular lamp of the present embodiment having the above-described configuration, the prism portion 17 provided on the inner surface of the stepped molding portion 16 of the lens frame 14 existing at the front upper portion of the reflector 11 out of the direct light of the light source bulb 10. The direct light incident on is diffused by the prism portion 17 as indicated by an arrow Lb in FIG. Thereby, the reflected light component which reflects on the inner surface of the stepped molded part 16 and is directed obliquely forward and downward is reduced.

  As a result, it is possible to suppress the generation of upward harmful light that is reflected obliquely upward on the surface of the lower inner panel 3 existing in the lower front of the projection lens 12.

  In particular, in the present embodiment, the prism portion 17 has a shape in which a plurality of kamaboko-shaped protrusions 17 a extending in the optical axis direction of the lamp unit 1 are continuously provided in the circumferential direction of the inner surface of the stepped molded portion 16. Therefore, the diffusion effect in the circumferential direction (left-right direction) is high, and the effect of reducing the reflected light component directed obliquely downward to the front can be further enhanced.

  In addition, by configuring the prism portion 17 having a plurality of protrusions 17a arranged in the circumferential direction of the inner surface of the stepped molded portion 16 in this way, the hot air that flows out of the lamp unit 1 from below the stepped molded portion 16 can be obtained. The heat diffusion effect can be improved.

  The prism portion 17 on the inner surface of the lens frame 14 is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the prism portion 17 may be provided in a required area including the stepped molding portion 16 or may be provided on the inner peripheral surface of the side portion. Moreover, the cross-sectional shape of the prism part 17 should just be a shape which can diffuse-reflect the direct light of the light source bulb | bulb 10, and is not restricted to the said cross-section kamaboko-type continuous shape.

DESCRIPTION OF SYMBOLS 1 ... Lamp unit 2 ... Outer lens 3 ... Inner panel 10 ... Light source bulb 11 ... Reflector 12 ... Projection lens 13 ... Shade 14 ... Lens frame (structure of reflector front part)
16 ... Stepped molding part 17 ... Prism part 17a ... Projection

Claims (2)

A light source bulb, a reflector having a reflection surface that reflects light from the light source bulb forward, a projection lens that irradiates the light reflected by the reflector forward, and a frame member that holds the projection lens and the reflector. Vehicle headlamps,
A vehicle headlamp characterized in that the frame member is provided with a prism portion for diffusing light irradiated between a projection lens and a reflector, out of direct light from a light source bulb.   2. The prism portion according to claim 1, wherein the prism portion is composed of a ridge-shaped ridge that extends in the optical axis direction, and the ridge is formed in a shape in which a plurality of ridges are arranged in a circumferential direction on the inner surface of the frame member. The vehicle lamp as described.

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