JPH0451362Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a vehicle lamp related to lighting technology for a lamp installed in a vehicle such as an automobile.

[Conventional technology]

Traditionally, headlights for vehicles such as automobiles include an outer lens fixedly installed in front of a lighting bulb provided on the front side of a reflector, and an inner lens for light distribution between the outer lens and the lighting bulb. However, the inner lenses generally used in this type of vehicle lamp have low perforation efficiency and cannot provide uniform light distribution.

[The problem that the idea aims to solve]

That is, in the conventional structure, as shown in FIG. 7, a prism 51 and a condensing step 52 are carved into the inner lens 50, and the structure is such that the light beam from the lighting bulb is diffused. When the pitch of the condensing step 52 is 1.5 mm or less, (1) sagging occurs at the top T and valley V of the prism during molding, resulting in loss of light distribution.

(2) It becomes difficult to align the prism 51 and the condensing step 52.

(3) Although the top coat 53 is necessary for the purpose of protecting the reflective surface, the top coat 53 accumulates in the valleys of the prism 51, increasing light distribution loss.

(4) To obtain appropriate light distribution, light focusing step 5 is necessary.
It is preferable that the focal position of the second prism is located between the exit surface of the first prism and the reflection surface of the second prism in the step of the prism 51. However, if this is designed with a pitch of 1.5 mm or less, the inner The basic wall thickness t of the lens 50 is 1.5 mm.
As a result, it becomes difficult to mold the lens.

(5) When carving the prisms 51 parallel to each other, the mold for molding the prisms is composed of stacked slice molds, and if the pitch is small, the rigidity of the mold will be insufficient, making it difficult to produce in large quantities over a long period of time. become unable to respond.

Furthermore, if the pitch between the prism 51 and the condensing step 52 is 1.5 mm or less, (1) the basic wall thickness t of the inner lens 50 will be approximately 3 mm, increasing material costs and molding costs;
In addition, since it is thick, "sink marks" occur during molding, and the prism 51 shrinks, making it impossible to obtain a predetermined angle, which affects light distribution.

(2) Since the wall thickness t increases, it is necessary to increase the diffusion angle θ of the condensing step 52, but in this case, reflection loss occurs and the efficiency decreases.

(3) The light is too diffused, making it impossible to obtain a favorable light distribution.

(4) When the inner lens is colored, the optical path length increases, so the amount of absorbed light increases and the light distribution decreases. Inner lens 5
Even when the basic wall thickness t of 0 was set to 2.0 mm, the diffusion angle θ of the condensing step 52 became large, reflection loss occurred, and the light distribution efficiency decreased.

The present invention was devised in view of the above-mentioned problems, and aims to provide a vehicle lamp equipped with an inner lens that has excellent perforation efficiency and can obtain uniform light distribution. be.

[Means to solve the problem]

In order to achieve the above object, the vehicle lamp according to the present invention has an outer lens fixedly installed in front of a bulb provided in front of a reflector, and a double-reflection prism carved between the outer lens and the lighting bulb. In the vehicle lamp equipped with an inner lens, the inner lens has a plurality of prisms carved in parallel or concentrically at a constant pitch on the side surface of the outer lens, and the basic shape of the lens is mirror-finished. The prism has a concave curved surface with respect to the vapor deposition source side, and is configured such that the intersection of the lens axis including the vapor deposition source and a line extending the non-evaporation surface of each of the prisms is located further away from the vapor deposition source. In addition, the main feature is that a condensing step having the same pitch as that of the prism is carved on the side surface of the lighting bulb of the inner lens.

Further, it is preferable that the pitch between the prism of the inner lens and the condensing step is 1.5 mm to 3.0 mm.

[Effect]

In the above configuration, the inner lens of the vehicle lamp is
The prism step forms a concave curved surface toward the evaporation source, and the prism step is configured such that the line extending from the non-evaporation surface intersects the lens axis containing the evaporation source at a position far from the evaporation source. When forming a reflective surface using
A preferred step pitch can be designed. Therefore, it is possible to obtain good perforation efficiency and light distribution, and in addition, since the basic shape of the inner lens is a concave curved surface, the sense of depth at the front of the lamp is increased.

〔Example〕

Embodiments of the vehicle lamp according to the present invention will be described below with reference to the drawings. FIGS. 1 and 2 show the structure of the inner lens 1 of the present invention.

The basic shape of the inner lens 1 is a concave curved surface with respect to the vapor deposition source 2 for mirror finishing, and a large number of double reflection prisms 4, 4... ... are carved parallel or concentrically at a constant pitch P, and a large number of condensing steps 6, 6 having the same pitch as the pitch P of the prism 4 are formed on the surface of the inner lens 1 on the side of the bulb 5, which will be described later. ...is formed. Each of the prisms 4 has a non-evaporation source 4 of the prism 4.
The line 7, which is an extension of a, intersects the lens axis 8 including the vapor deposition source 2 at a position farther from the vapor deposition source 2 (in the range indicated by arrow A).

Therefore, the crossing position is fixed within the prism 4 of one inner lens 1, or as indicated by the arrow A.
The displacement can be designed within the range of .

Further, the pitch P between the prism 4 of the inner lens 1 and the condensing step 6 is configured in the range of 1.5 mm to 3.0 mm, and the reflective surface 4b of the prism 4 is coated with an aluminum film 9 by vacuum deposition from the vapor deposition source 2. It is made up of clothes.

FIGS. 3 and 4 show a first embodiment of a vehicle lamp in which a concentric prism 4 and a condensing step 6 are carved into an inner lens 1.
is a reflector constituted by a parabolic reflecting surface with the focal point at the position of the lighting bulb 5, and the reflector 1
An inner lens 1 is fixedly mounted on a transparent support plate 12 supported on the front surface of the lens 0, and the front surface thereof is covered with an outer lens 3.

Furthermore, FIGS. 5 and 6 show the inner lens 1
This figure shows a vehicle lamp in which a prism 4 and a condensing step 6 are engraved in parallel to the surface of the vehicle. The front surface of the lens is covered with an outer lens 3.

[Effect of idea]

Since the vehicle lamp according to the present invention is constructed as described above, in the prism step of the inner lens, the line extending from the non-evaporation surface intersects the lens axis including the evaporation source at a position far from the evaporation source. By configuring this, it is possible to design a preferable step pitch and obtain good perforation efficiency and light distribution, and the basic shape of the inner lens is a concave curved surface, which increases the sense of depth at the front of the lamp. The practical effects after implementation of this invention are extremely large.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the principle of construction of the inner lens of the vehicle lamp according to the present invention, Fig. 2 is an enlarged sectional view of the same main part, and Fig. 3 is a schematic side view showing the first embodiment of the vehicle lamp. 4 is a front view of the inner lens, FIG. 5 is a schematic side sectional view showing a second embodiment of the vehicle lamp, FIG. 6 is a front view of the inner lens, and FIG. 7 is a conventional one. FIG. 3 is an explanatory diagram showing the steps of the inner lens of FIG. 1... Inner lens, 2... Evaporation source, 3...
Outer lens, 4...prism, 5...bulb, 6...condensing step, 7...line extending the non-evaporated surface of the prism, 8...lens surface.

Claims (1)

[Claims for Utility Model Registration] (1) An inner lens consisting of an outer lens fixed in front of a lighting bulb provided on the front side of a reflector, and a double-reflection prism carved between the outer lens and the lighting bulb. In a vehicle lamp equipped with a lens, the inner lens has a plurality of prisms carved in parallel or concentric circles at a constant pitch on the side surface of the outer lens, and the basic shape of the lens is placed on the side of the vapor deposition source for mirror finishing. The inner prism has a concave curved surface, and the intersection point of the lens axis including the vapor deposition source and a line extending the non-evaporation surface of each of the prisms is located far from the vapor deposition source, and the inner A vehicular lamp characterized in that a condensing step is engraved on the side surface of a bulb of a lens at the same pitch as the prism. (2) The vehicle lamp according to claim 1, wherein the pitch between the prism of the inner lens and the condensing step is 1.5 mm to 3.0 mm.