JPH034919Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a headlight tester for measuring the luminous intensity and optical axis angle of an automobile headlight, and in particular, to instruct to enlarge the measured value of the optical axis angle. This is the purpose.

(Prior art and problems to be solved) Conventionally, in a headlight tester for measuring the luminous intensity and optical axis angle of a headlight, a balance meter is used to instruct the balance meter to determine the vertical and horizontal balance of the light beam hitting the light receiving section provided in the device. At the same time, the light receiving section is moved vertically or horizontally so that the pointer of the balance meter becomes "0", and the optical axis angle is determined from the amount of movement of the light receiving section at this time. Since the amount of movement of the light receiving section was measured from the rotation angle of the adjustment knob for moving the light receiving section, there were problems in that the measurement itself was difficult and the error was large.

(Means for solving the problem) However, this invention is based on a bright spot generating device (one end becomes a bright spot that emits bright light) to form a light emitting part (smiling bright spot, hereinafter referred to as a bright spot) corresponding to a headlight. (a device consisting of an optical fiber bundle with the other end facing the light source) is provided in the housing, and the tip of the optical fiber that generates the bright spot and the light receiving section are linked by an enlarged link mechanism. , the bright spot generating device is arranged to face the inner surface of a measurement scale plate installed on one side of the housing so that the movement of the bright spot can be seen through the measurement scale plate, so that the amount of movement of the light receiving section can be determined. , can now be determined from the magnified movement amount of the bright spot, making it possible to measure the optical axis angle easily and accurately, thus solving the conventional problems.

In other words, this idea is based on a headlight tester that measures the luminous intensity and optical axis angle of a headlight by directly facing the headlight of an automobile. and a light emitting section are installed to be movable vertically and horizontally, respectively, and the light receiving section is connected with pins in a parallelogram shape by bringing two adjacent short rods closer to the adjacent sides of two adjacent long rods. The light-emitting part is attached to one connecting part of the enlarged link mechanism formed by the above-mentioned long rod, and the light-emitting part is attached to the inner surface of a measurement scale plate installed on one side of the housing. This is a headlight tester characterized by being placed opposite the. Further, the light emitting part is the tip of the optical fiber bundle.

Furthermore, the enlargement link mechanism has variable enlargement magnification.

(Function) In this invention, the light receiving section and the light emitting section are each attached to an enlargement link mechanism, so that the two maintain a constant relationship and interlock, and the movement of the light emitting section is instructed to be enlarged.

(Example) That is, to explain this invention in terms of an example, a measuring stand 3 is attached to the main leg 2 installed on the leg stand 1 so as to be movable up and down, and a housing 4 housing a measuring system is placed on the measuring stand 3. In the installed headlight tester, a light receiving plate 6 is installed to be movable vertically and horizontally to receive the headlight light guided into the housing 4 through the Fresnel lens 5 installed at the center of the lower front of the housing 4. (Fig. 2), this light receiving plate 6
In the center of the back side, long rods 7a, 7b and short rods 7c, 7
d is connected to the connecting portion of the short rods 7c and 7d of the enlarged link mechanism 7 formed by linking in a parallelogram, while the end edge of the long rod 7b is rotatably attached to the bottom plate 4a of the casing 4. , on the edge of the long rod 7a,
The tip of the optical fiber bundle 18 is attached so that the tip faces the inner surface of the measuring scale plate 8 installed on the upper front surface of the housing 4. As shown in FIG. 4, the light receiving plate 6 is constructed by embedding a photovoltaic cell 10 and four solar cells 11a, 11b, 11c, and 11d in a rectangular plate 9 on all sides. An elevating device 13 is installed on a horizontally movable platform 12 installed on the bottom plate 4a, and the light receiving plate 6 is attached to this elevating device 13. The moving table 12 and the lifting device 1
3, a linear movement mechanism is constituted by screw rods 14, 14 and nuts 15, 15 screwed thereto, respectively, and the screw rods 14, 14 are connected to adjustment knobs 16, 16a installed on the side of the housing 4 and flexible wires. , connected by other connectors. A small hole 17 is bored in one side of the rectangular plate 9 that constitutes the light receiving plate 6, and the base end of the optical fiber bundle 18 is attached to the small hole 17. (therefore, the light emitting part) is inserted into the conduit 28 fitted in the small hole 19 bored at the end edge of the long rod 7a of the expansion link mechanism 7 (FIG. 3), and the measuring scale plate 8 A bright spot generating device is configured so as to face near the inner surface of the tube.

A part of the headlight light guided to the light receiving plate 6 is guided to the inner surface of the measuring scale plate 8 via the optical fiber bundle 18. The measuring scale plate 8 is made of frosted glass or other semi-transparent plate.
A checkerboard-like scale 20 is attached to the surface of the optical fiber bundle 18, and the headlight light guided to the tip of the optical fiber bundle 18 is visible as a bright spot 21 through the measurement scale plate 8. Figure 2).
22 in the figure is a handle for raising and lowering the measuring table 3;
23 is a headlight 24 and a telescope (first
25 is a photometer, 26 is a balance meter that indicates the vertical inclination of the optical axis, and 27 is a balance meter that indicates the horizontal inclination of the optical axis.

In the embodiment described above, the photovoltaic cell 10 receives the headlight light guided to the light receiving plate 6, calculates the luminous intensity, and instructs the photometer 25 in the same manner as in the conventional headlight tester. For the measurement of the optical axis angle, solar cells 11 are installed separately in the upper and lower directions.
The light receiving plate 6 is raised and lowered via the adjustment knob 16 so that the same amount of headlight light is irradiated to the areas a and 11b (the indicated value of the balance meter 26 becomes 0), and it is determined from the lifting distance of the light receiving plate 6 at this time. . In addition, regarding the left and right direction, the solar cells 11 distributed to the left and right
The light receiving plate 6 is moved left and right via the adjustment knob 16a so that the same amount of headlight light is irradiated on the areas c and 11d (the indicated value of the balance meter 27 becomes 0).
It is determined from the moving distance of the light receiving plate 6 at this time. When the light-receiving plate 6 moves up and down, the distance it moves up and down is expanded by the expansion link mechanism 7, and is mechanically transmitted to the bright spot generating device.As a result, the bright spot 21 moves up and down. It can be read from the rise and fall of the bright spot 21 at . The same is true when the light receiving plate 6 moves left and right, the distance traveled is magnified by the enlargement link mechanism 7 and transmitted to the bright spot generator, and as a result of the bright spot 21 moving left and right, the amount of movement in the left and right direction is also used for measurement. It can be read on the scale plate 8.

The magnification link mechanism 7 is based on the same principle as a commonly used magnifier, and its magnification can be changed to 2x, 3x, 4x, etc., so that the optical axis angle can be changed. Even if there is a slight change,
It is now possible to sufficiently magnify and measure with high precision.

In the above embodiment, the bright spot generating device was configured to guide a part of the headlight light to the tip of the optical fiber bundle 18, but a light source was separately installed in the housing 4, and the light source was It is also possible to arrange the base end portions of the optical fiber bundle 18 to face each other, so that the bright spot 21 is formed independently of the headlight light. In this case, the luminous intensity of the bright spot 21 can be made sufficient for measurement depending on the surrounding brightness by making the light source installed inside the housing sufficiently bright or by making the luminous intensity adjustable. can.

(Effect of the invention) That is, according to this invention, the vertical and horizontal movement of the light receiving plate is magnified and transmitted to the bright spot generator, so the optical axis angle of the headlight light can be measured easily and accurately. There is. The bright spot generating device is constituted by the tip of an optical fiber bundle, and a part of the headlight light or the light from a separately installed light source is guided to this part. This has the effect of making the measurement work easier by setting the luminous intensity to a desired brightness.

Further, by making the magnification of the enlargement link mechanism that transmits the movement of the light receiving plate to the bright spot generating device variable, it is possible to accurately measure even when the optical axis angle changes slightly.

[Brief explanation of the drawing]

Fig. 1 is a front view of an embodiment of this invention, Fig. 2 is an enlarged front view of the main part of the embodiment, Fig. 3 is an enlarged side view of the main part of the embodiment, and Fig. 4 is a light receiving part of the embodiment. It is an enlarged front view of a board. 1...Leg stand, 2...Main landing gear, 3...Measurement stand, 4...
...Housing, 4a...Bottom plate, 5...Fresnel lens,
6...Light receiving plate, 7...Enlargement link mechanism, 7a, 7
b...Long rod, 7c, 7d...Short rod, 8...Measurement scale plate, 9...Rectangular plate, 10...Photovoltaic cell, 1
1a, 11b, 11c, 11d...Solar cell, 1
2...Moving table, 13...Elevating device, 14...Screw rod, 15...Nut, 16...Adjustment knob, 17...
...Small hole, 18...Optical fiber bundle, 19...Small light, 2
0...Scale, 21...Bright spot, 22...Handle,
23...Telescope, 24...Hedlight, 25...
...Photometer, 26, 27...Balance meter, 28...
conduit.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. In a headlight tester that measures the luminous intensity and optical axis angle of a headlight by directly facing the headlight of an automobile,
A light-receiving section and a light-emitting section are installed inside a casing that can be raised and lowered so as to be movable vertically and horizontally, respectively, and the light-receiving section connects two adjacent short rods to two adjacent long rods. The light emitting part is attached to one connecting part of an enlarged link mechanism formed by connecting pins in a parallelogram shape close to the adjacent side of the light emitting part.
A headlight tester, characterized in that the light emitting part is attached to the tip side of one of the long rods and is opposed to the inner surface of a measuring scale plate installed on one side of the housing. 2. The headlight tester according to claim 1, wherein the light emitting part is the tip of an optical fiber bundle. 3. The headlight tester according to claim 1, wherein the enlargement link mechanism has variable enlargement magnification.