JP2596944Y2 - Headlight tester light distribution screen - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light distribution screen of a headlight tester for measuring a low beam (a low beam) of a vehicle headlight.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 3, a thick reference line a is engraved at the center of a horizontal scale line and a vertical scale line, and a scale line other than the reference line a is formed by a medium thin line b.
And a thin line c are alternately formed.

[0003]

However, according to the conventional light distribution screen, the horizontal scale lines and the vertical scale lines a, b, c arranged at equal intervals are solid lines over their entire lengths. When the low-light boundary line (cut line) of the low beam of the headlight applied to the screen substantially coincides with the horizontal scale line, the line looks distorted due to the illusion of the eye, and thus the horizontal portion of the cut line and the horizontal portion There is a problem that a rising portion or the like in a diagonal direction cannot be accurately measured.

An object of the present invention is to solve such a problem and to provide a light distribution screen capable of accurately measuring a cut line of a headlight.

[0005]

In order to achieve the above object, the present invention provides a horizontal scale line and a vertical scale line which are arranged at equal intervals on a screen main body, and a peripheral portion of the screen main body is centered on a solid line. The portion is formed by a dotted line.

[0006]

Since the center of the screen is formed by a dotted line, even if the horizontal portion of the cut line connecting the light and dark boundary points coincides with the dotted line, it is possible to determine a rising portion in an oblique direction and the like. It becomes possible to measure accurately.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a headlight tester. The headlight tester 1 has a movable pole 1a and a mount 1c which can be moved up and down by a handle 1b with respect to the pole 1a.
A dark box 2 fixed on the gantry 1c and having a condensing lens on the front surface; and a screen 3 for irradiating a cut line with a low beam of the headlight light reflected after condensing by the condensing lens. And the like having the same.

As shown in FIG. 1, the screen 3 has a cross-shaped mark 3b at the center of a rectangular screen main body 3a, and a dotted scale line 3c extending horizontally and vertically from the mark 3b. , 3d is formed,
The periphery of the even-numbered screen main body 3a of the dotted scale lines 3c and 3d is formed as solid lines 3e and 3f. still,
5 is a numerical value indicating the value of the low beam.

Next, the operation of the headlight tester will be described.

The vehicle to be measured enters a substantially predetermined position, and the gantry 1c is moved by the pole 1a and the handle 1b so that the condenser lens faces the headlight.

The light from the headlight is condensed by a condenser lens and then reflected by a reflecting mirror installed in a dark box 4 or the like, so that a cut line image A is formed on the screen main body 3.
a.

At this time, since the cut line image A has dotted scale lines 3c and 3d formed at the center on the screen main body 3a, the light and dark boundary points B of the image can be clearly distinguished without distortion. An accurate cut line can be measured through the solid lines 3e and 3f around the screen main body 3a.

The combination with the dotted scale lines 3c and 3d and the solid lines 3e and 3f on the screen main body 3a can be arbitrarily changed.

[0015]

As described above, according to the present invention, the horizontal scale lines and the vertical scale lines arranged at equal intervals on the screen main body are formed with the periphery of the screen main body being a solid line and the central portion being a dotted line. Therefore, even if the cut line substantially coincides with the location of the dotted line in the center, the cut line appears clearly and the illusion of the eyes is unlikely to occur as in the related art, and therefore, there is an effect that the cut line of the headlight can be accurately measured. .

[Brief description of the drawings]

FIG. 1 is a plan view of a screen body of the present invention.

FIG. 2 is a front view of the headlight tester of the present invention.

FIG. 3 is a plan view of a conventional screen main body.

[Explanation of symbols]

 3 Screen 3a Screen body 3c, 3d, 3e, 3f Scale line

Claims (1)

(57) [Scope of request for utility model registration] 1. A headlight tester wherein a horizontal scale line and a vertical scale line arranged at equal intervals on a screen main body are formed by a solid line at a peripheral portion of the screen main body and a dotted line at a central portion thereof. Light distribution screen.