JPH086330Y2 - Signal lights for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The vehicle signal light according to the present invention will be described in detail in accordance with the following items.

A. Industrial fields of use B. Overview of the device C. Prior art [Fig. 4] D. Problems to be solved by the device [Fig. 5] E. Means for solving the problems F. Example [Chapter 4] 1 to 3] a. Outline of configuration [Fig. 1] b. Prism element [Figs. 2 and 3] c. Function G. Effect of device (A. Industrial application field) The present invention The present invention relates to a new vehicle signal light. For more information,
In order to irradiate light in a direction forming a predetermined angle with respect to the optical axis of the lamp, a vehicle signal lamp having a lens in which a plurality of prism elements are formed adjacent to each other and a condenser lens element is formed, An object of the present invention is to provide a new vehicular signal lamp with less loss of light amount by cutting the top of the prism element.

(B. Outline of the Invention) The signal light for a vehicle of the present invention has a plurality of condensing lenses formed on the inner surface of the lens to form parallel rays obtained by reflecting the light from the light source by the reflecting surface of the paraboloid of revolution. A signal lamp for a vehicle, in which a plurality of prism elements formed adjacent to the outer surface of the lens after converging by the element irradiate in a direction forming a predetermined angle with respect to the optical axis of the lamp, the prism element Is formed in a shape with its top removed, so that for the light emitted from a certain prism element, the top of a prism element adjacent to this does not block the optical path, thus causing no loss of light quantity. It was done like this.

(C. Prior art) [Fig. 4] As a display light for indicating a stop intention in a vehicle, a so-called high-mount stop lamp is known, and there is one arranged inside a rear window of the vehicle.

An example of such a device is disclosed in Japanese Utility Model Laid-Open No. 61-114610, in which a plurality of prism elements are formed on the outer surface of an outer lens and a condenser lens element corresponding to each prism element is formed on the inner surface thereof. Are formed.

The outer lens is divided into two areas, the light passing through one area is slightly upward with respect to the horizontal line, and the light passing through the other area is slightly downward with respect to the horizontal line. Becomes

FIG. 4 shows an example of the luminous intensity distribution, where the horizontal axis represents the angle with respect to the horizontal line (where 0 ° corresponds to the reference horizontal line, and is referred to as “H”), and the vertical axis represents the luminous intensity ( Unit: cd). In addition, "U" represents the upward direction and "D" represents the downward direction.

Of the two areas in the outer lens, the contribution to the light distribution by the area that emits upward light to the horizontal line is shown by the graph curve a indicated by the alternate long and short dash line, and the downward light is emitted toward the horizontal line. The light distribution contribution by the region is indicated by a graph curve b indicated by a chain double-dashed line, and in the end, the entire luminous intensity distribution is a combination of the two and becomes like a graph curve c indicated by a solid line.

In the figure, d indicates the luminous intensity distribution required in the standard.

(D. Problem to be solved by the device) [Fig. 5] By comparing the graph curve a and the graph curve b by translating them along the horizontal axis so that the peak positions of the luminosity coincide with each other, it can be seen. However, there is a problem in that the downward irradiation light has a larger rate of decrease in the light amount from the peak value to the left (downward).

This is due to the fact that part of the light redirected by a certain prism element is blocked by the apex of the adjacent prism element.

That is, the outer lens e has prism elements f, f, ... On its outer surface, as shown in FIG.
Are formed, and condensing lens elements g, g, ... Corresponding to each prism element are formed on the opposite surface with a certain deviation from the prism element.

Therefore, the parallel light rays from the reflecting mirror (not shown) are condensed by the condenser lens elements g, g, ... And then totally reflected by the prism elements f, f ,. Since the condensing point i of the light rays h, h, ... Emitted from the element g is located near the top of the next prism element g, the light is partially blocked by this top. Such a phenomenon is remarkable with respect to the light aimed downward.

(E. Means for Solving the Problems) Therefore, in order to solve the above-mentioned problems, the vehicular signal lamp of the present invention has a shape in which the tops of a plurality of prism elements formed adjacent to the outer surface of the lens are removed. It was done.

Therefore, according to the present invention, with respect to the light emitted from a certain prism element, the loss of the light quantity due to the top of the prism element adjacent to the prism element blocking the optical path is reduced.

(F. Embodiment) [Figs. 1 to 3] The details of the vehicular signal lamp of the present invention will be described below with reference to the illustrated embodiment.

(A. Outline of configuration) [Fig. 1] 1 in the figure is a high mount stop lamp.

Reference numeral 2 denotes a lamp body, on the inner bottom surface of which a reflecting surface 3 in the shape of a paraboloid of revolution is formed.

Reference numeral 4 denotes a light bulb arranged in the lamp body 2, and its filament 5 is located at the focal point of the reflecting surface 3.

Reference numeral 6 denotes a lens, which is provided so as to cover the front surface of the lamp body 2.

.. are formed on the inner surface of the lens 6, and the parallel light rays from the reflecting surface 3 are condensed toward the total reflection surface of the prism element described later. It has a function. Although the illustrated example is a type of lamp that does not have an inner lens, in the case where an inner lens having a cylindrical lens step is interposed between the lens 6 and the light bulb 4, the lens 6
A cylindrical lens step extending in a direction orthogonal to the cylindrical lens step of the inner lens is used as the condensing lens element.

The outer surface of the lens 6 is divided into two areas 6a and 6b, and prism elements having different step angles are formed in each area.

That is, the plurality of prism elements 8, 8 formed adjacent to the region 6a are rearward (indicated by an arrow A) or H.
It is provided in order to obtain irradiation light aiming upward with respect to the horizontal line indicated by -H.

Further, the plurality of prism elements 9, 9, ... Formed adjacent to the region 6b are provided to obtain irradiation light aiming downward with respect to the horizontal line H-H.

A rear window 10 forms an inclination angle θ with respect to a vertical line V-V.

(B. Prism Element) [FIGS. 2 and 3] FIG. 2 is a partially enlarged view of the prism elements 9, 9, ... In the region 6b.

As can be seen from the figure, the prism elements 9, 9, ...
Is cut off at the top, and flat parts 9a, 9a, ...
(The width is defined as “w” (unit: mm).).

That is, the parallel rays from the reflecting surface 3 are the rays 11, 11, ...
The light enters the condenser lens element 7 and then is totally reflected by the prism element 9 and is emitted to the outside of the prism element 9 (the central ray of the condenser lens element 7 is a horizontal line H-H by the prism element 9). The light is directed downward at an angle of 3 °). Then, the light is diffused after being condensed at the condensing point 11 _c , but since the tops of the prism elements 9, 9, ... Are removed, the prism elements 9, 9 ,.
There is little influence that the tip portion of the light beam interferes with the irradiation light from the adjacent prism element.

In order to see this effect, FIG. 2B shows a luminous intensity distribution chart when the cut width w of the flat portion 9a is changed.

In the measurement, the conditions regarding the shape and size of the prism element 9 and the condenser lens element (cylindrical lens) 7 are as shown in Table 1 below.

In the above table, the step angle β is represented by the angle formed by the total reflection surface of the prism element with respect to the surface including each vertex (virtual vertex) of the prism element. Also, the basic wall thickness d is the lens 6
Of the thickness of the prism element and the condenser lens element, the deviation e means a shift in the correspondence between the prism element and the condenser lens element.

In FIG. 2 (B), a graph curve 12 shown by a broken line shows a luminous intensity distribution when the tops of the prism elements 9, 9, ... Are not cut (cut width w = 0), and a graph curve shown by a solid line. Reference numeral 13 indicates the luminous intensity distribution when the cut width w = 0.2 mm and the graph curve 14 indicated by the one-dot chain line indicates the luminous intensity distribution when the cut width w = 0.4 mm (the definition of each coordinate axis in FIG. 4 is shown in FIG. 4). 15 represents the luminous intensity distribution of the standard light distribution.) From these graph curves, when the prism element 9 has an appropriate cut width, the light amount loss of the downward light with respect to the horizontal line is shown. It can be seen that the brightness decreases and the luminous intensity increases overall.

FIG. 3 (A) shows prism elements 8, 8, ...
Is partially shown, the top of which is removed and the flat portion 8
A, 8a, ... (The cutting width is “w” (mm).) are formed. Then, the central light beam of the condenser lens element 7 becomes an upward light which makes an angle of 2 ° upward with respect to the horizontal line H-H after exiting the prism element 8.

FIG. 3B shows the luminous intensity distribution when the cut width w is changed to 0 mm, 0.2 mm, and 0.4 mm (the definition of the graph axis is the same as that in FIG. 4). Regarding the measurement conditions for the prism element and the condenser lens element, each variable value is shown in Table 1 except that the step angle (referred to as “β ′”) is β ′ = 55 ° 23 ′. Same as the value.

In the figure, a graph curve 16 indicated by a broken line shows the luminous intensity distribution when the cut width w = 0, and when the cut width is w = 0.2 mm, the luminous intensity is increased as a whole as shown by a solid curve curve 17. However, if it is cut too much (w = 0.4 mm), as indicated by the dashed-dotted line graph curve 18, the light reduction from the peak point of the luminous intensity to the left (downward) becomes remarkable, which is the opposite effect.

Then, if the cut width w of the prism element is in an appropriate range, the light distribution is improved, but if the cut width is increased to some extent, the loss with respect to the downward irradiation light tends to increase.

When the luminous intensity distribution was measured while varying the cut width w, it was found that the range in which the cut width w is about 0.1 to 0.2 times the pitch P of the prism element and the condenser lens element is suitable for light distribution. It was

(C. Action) In the high mount stop lamp 1 described above,
By removing the tops of the plurality of prism elements 8 and 9 formed adjacent to the outer surface of the lens 6, light loss due to the influence of the tops of the adjacent prism elements can be reduced.

(G. Effect of the Invention) As is clear from the above description, the vehicle signal light of the present invention uses a lens to convert parallel light rays obtained by reflecting light from a light source by a rotating parabolic reflecting surface. After being condensed by a plurality of condenser lens elements formed on the inner surface of the lamp, the plurality of prism elements formed adjacent to the outer surface of the lens irradiate the lamp in a direction forming a predetermined angle with respect to the optical axis of the lamp. In such a vehicular signal lamp, the prism element is formed in a shape with its top removed.

Therefore, according to the present invention, the loss of the amount of light due to the light emitted from a certain prism element being blocked by the apex of the prism element adjacent to the prism element blocks the optical path, and compared with the case where the prism element has the apex. The light distribution characteristics are improved.

In the illustrated embodiment, the prism element has a shape in which the flat surface is formed as the top portion is removed, but the shape is not necessarily limited to this as long as the top portion is removed.

[Brief description of drawings]

1 to 3 show an example of a vehicular signal lamp according to the present invention. FIG. 1 is a longitudinal sectional view, and FIG. 2 is a view for explaining a region of a lens for obtaining downward irradiation light. (A) is a longitudinal sectional view showing a part of the enlarged view.
(B) is a luminous intensity distribution diagram, FIG. 3 is a diagram for explaining a region for obtaining upward irradiation light in the lens, (A) is a longitudinal sectional view showing a part of it, (B) ) Is a luminous intensity distribution chart, FIGS. 4 and 5 are for explaining an example of a conventional vehicular signal lamp, FIG. 4 is a schematic luminous intensity distribution chart, and FIG. 5 is a problem. It is a schematic longitudinal cross-sectional view for doing. Explanation of reference numerals 1 ... Vehicle signal lamp, 3 ... Reflecting surface, 4 ... Light source, 6
...... Lens, 7 ...... Condensing lens element, 8, 9 ...... Prism element, 8a, 9a …… Shape with the top removed

Claims (1)

[Scope of utility model registration request] 1. A parallel light beam obtained by reflecting light from a light source on a rotating parabolic reflecting surface is condensed by a plurality of condenser lens elements formed on the inner surface of the lens, and then is formed on the outer surface of the lens. In a vehicle signal lamp in which a plurality of prism elements formed adjacently irradiate in a direction forming a predetermined angle with respect to the optical axis of the lamp, the prism element is formed in a shape with its top removed. Signal lights for vehicles characterized by being