JPH02259441A - Apparatus for measuring optical axis luminous intensity of headlight - Google Patents

Abstract

PURPOSE:To measure luminous intensity by accurately opposing the optical axis of a lamp to the surface of a Fresnel lens at once by integrally providing a light detection part to the rear of the Fresnel lens to slide the integrated structure up and down as well as left and right. CONSTITUTION:A Fresnel lens 1 has condensing function capable of performing the measurement same to that performed in a state separated by a distance of 10m from a head lamp and is mounted on the front end of a light detection part 2 supported on a fixing body 7 by four link rods 3 - 6. A reflecting mirror 9 reflecting the light condensed by the lens 1, a sensor substrate 10, a balance meter and a spectrometer are provided in the light detection part 2 and dial knobs 11, 12 move the light detection part 2 left and right as well as up and down. When the angle of the lamp is 0 deg. up and down and 0 deg. left and right, the balance meter shows 0 but, when the lamp is inclined by 0 deg., the balance meter does not show 0. When the knobs 11, 12 are rotated so that the balance meter shows 0, the surface of the lens is inclined by 0 deg. and accurately opposed to the optical axis of the lamp at a right angle. When both of them are once opposed accurately to each other, a main body is not moved regardless of the angle of inclination of the lamp and the optical axis luminous intensity of the lamp can be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for measuring the optical axis luminous intensity of an automobile headlight.

[Prior Art] There are roughly two types of methods for measuring the optical axis luminous intensity of headlights.

(1) A method in which the condensing lens is made as large as necessary and the center of the lamp is directly facing the lens for measurement.

(2) First, align the lamp center and lens center directly, tilt the light receiving section so that the balance needle is at "0", and then -
Move the main body up and down, left and right to face the lamp.

Then adjust the balance needle. A method of measuring by moving further up and down, left and right, correcting the direct alignment, and aligning the balance needle.

Method (1) above has the advantage of being able to measure without moving the main body once it is directly facing the lamp. On the other hand, (1) is not a problem when the lamp angle is around 0°, but when the angle becomes large, the measurement accuracy may decrease depending on the lamp.
In No. 21, the measurement work is repeated, so the measurement time is long and the workability is poor.

[Problems to be Solved by the Invention] The problems of the present invention are to provide a headlight that takes advantage of each of the above-mentioned conventional methods and that can be measured by making the lens surface face perpendicular to the lamp optical axis only by adjusting the hydraulic pressure. An object of the present invention is to provide an optical axis photometry device.

[Means for Solving the Problems] The means of the present invention is such that a light receiving section is integrally provided on the back side of a Fresnel lens, and the main body installed on the rear side of the light receiving section and the Fresnel lens are connected by several link rods. , a mechanism was provided that allowed the Fresnel lens and light receiving section supported by link rods to slide vertically and horizontally.

[Example] In the figure, 1 is a Fresnel lens and the distance is 10m from the headlamp 15.
It is attached to the front end of the light receiving section 2 and has the function of condensing light that can be used to perform the same measurement as when measuring distances apart.

The light receiving part 2 with a Fresnel lens has four link rods 3,
It is supported by the fixed body 7 by 4.5°6. Light receiving part 2
As shown in Fig. 3, a thrust and a spherical bearing 3 are attached to the fixed body 7.
It has a light-receiving section support shaft 8 that is supported at
0, balance needle, photometer, amplification circuit, etc. The sensor board is installed at a position where the light focused by the lens can reproduce the light distribution at a position 10 m in front of the lamp. Reference numeral 11 is a dial knob for moving the light receiving section 2 from side to side, and a knob 32 at the end of a shaft 31 engages with a rack 33 on the side of the light receiving section 2 to move the light receiving section 2 from side to side. Reference numeral 12 is a dial knob for moving the light receiving section 2 up and down, and a pinion 35 at the end of a shaft 34 engages with a rack 36 on the light receiving section 2 side to move the light receiving section 2 up and down.

Points a, a', and points b' on the extended line are set on an arc of measurement distance (1 m) centered on the center of the lamp 15, and links are established between a and b and between a' and 57 using these points as fulcrums. Attach sticks and place them at the same distance above and below. The light receiving section 2 of the Fresnel lens is supported by four link rods 3, 4, 5° 6 and a support shaft 8.8. In FIG. 1, 16 is a telephoto finder, 17 is a spirit level, 18 is a photometer, 19 is a power switch, 20 is a function switch, 21 is a balance needle, and 22 is a video screen.

[Function] When the angle of the lamp 15 is 0° vertically and 0° horizontally, the link rod is at the set position, the balance hand is at "o", and the dial knob is also at 0°.

When the lamp 15 is tilted by θ° as shown in FIG. 5, the balance needle will no longer be at "0".Turn the upper, lower, left and right dial knobs 11 and 12 so that the balance needle will be at "0". At this time, the lens center moves by tan θ, and the lens surface moves by θ0.
Tilt, perpendicular to the lamp optical axis. The amount of movement (Ω) of the rear axis is calibrated on the dial as the light angle.

[Effects of the Invention] According to the present invention, - Regardless of the inclination angle of the lamp, the main body does not move, and the link mechanism radially tracks the light distribution of 10 m in the same way as when it is at 0°, so that it can be used over a short distance. Optical axis luminous intensity can be measured.

[Brief explanation of drawings]

The drawings show an embodiment of the headlight optical axis photometry device according to the present invention, in which Fig. 1 is a perspective view, Fig. 2 is a plan view, Fig. 3 is a side view, and Fig. 4 is a light receiving device. FIG. 5 is a side view of the Fresnel lens in which the parts are integrally provided, and FIG. 5 is a side view showing the optical axis light intensity measurement state. 1...Fresnel lens 2...Light reception $3.4°5.
6...Link rod 7...Main body 8...Light receiving part support shaft 9...Reflection @ 10...Sensor board 11゜12...Dial knob 15...Lamp γ Diagram procedure amendment (Spontaneous) 1995/1995 Japanese Patent Application No. 1-80938-11 Name of Invention Relationship with the Case of Person Who Corrects Optical Axis Photometric Device for Headlights

Claims (1)

[Claims] A Fresnel lens that condenses light that can be measured in the same way as measurement from a distance of 10 m from the headlamp, a reflector for the condensed light beam, and a light distribution of the light from the reflector over the 10 m distance is reduced. The light receiving part is equipped with a sensor board provided at the position to be reproduced, the fixed body provided behind the light receiving part and the light receiving part are connected by several link rods, and the light receiving part supported by the link rods is connected. A headlight optical axis light intensity measurement device equipped with a mechanism that slides up, down, left and right.