JPH11304703A - Gloss measuring apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a measured value nearer to a visual gloss feeling. SOLUTION: Light detectors 3a-3c are arranged at a plurality of places containing an angle θ2 of reflection taken so as to be equal to an incident angle θ1 and gloss is measured on the basis of the measured values of the respective light detectors 3a-3c and the angles γb , γc of the light detector 3a on the angle θ2 of reflection with the light detectors 3b, 3c. Since reflected light can be caught multidimensionally by a plurality of the light detectors, a measured value near to a visual gloss feeling as compared with a conventional apparatus can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring gloss, for example, gloss on a painted surface of an automobile.

[0002]

2. Description of the Related Art Conventionally, gloss on a painted surface has been known.
, A mirror gloss meter may be used. As shown in FIG. 2, this gloss meter has a light source 2 arranged toward a surface 1 to be measured and a light receiver 3 arranged at a reflection angle θ ₂ equal to the incident angle θ ₁ (normally). , Θ ₁ = θ
₂ = 60 °), the brightness of the light source is I _i , and the measured value of the light receiver 3 is I, and the gross value k (gloss) is obtained from the equation I = kI _i .

[0003]

Since the above gloss meter measures reflected light only at one point and measures it, considering the visual function of human beings that determines the gloss by capturing the reflected light two-dimensionally. There is a drawback that the correlation with the visual perception is small and the reliability is low.

Accordingly, an object of the present invention is to provide a gloss measuring device capable of obtaining a measured value closer to the visual glossiness.

[0005]

In order to achieve the above object,
The gloss measuring device according to the present invention is a device for measuring
A light source for receiving reflected light from the light source.
Because Set the receiver above the reflection angle, which is equal to the incident angle.
At multiple locations, including the measured values at each receiver, and
The light is based on the angle between each receiver and the receiver on the angle of reflection.
It measures the swamp.

[0006]

FIG. 1 illustrates an embodiment of the present invention.

[0007] As shown in the figure, the apparatus comprises a light source 2 for projecting light onto a portion to be measured 1a of a painted surface 1 and a plurality of light receivers 3a, 3b, 3c for measuring reflected light from the portion to be measured 1a. I do. Each of the light receivers 3a to 3c has an optical axis of the light source 2 and a normal line N of the measured section 1a.
Are arranged on a plane including. One 3a of each light receiver (hereinafter, referred to as a reference receiver) are arranged to match the optical axis reflection angle theta ₂ taken equal to the incident angle theta _1,
The other light receivers 3b and 3c are arranged such that their optical axes have different angles γ _b and γ _c from the optical axis of the reference light receiver 3a, respectively. In the drawing, the other receivers 3b and 3c are used as reference receivers.
Although the case where it is arranged on the light source 2 side than 3a is illustrated, it may be arranged in a region on the opposite side. However, in any case, it is desirable to arrange the reference light receiver 3a at the end of the light receiver array. Also, the number of the light receivers 3a to 3c can be an arbitrary number of 2 or more.

The light emitted from the light source 2 is reflected by the measured section 1a and received by each of the light receivers 3a to 3c. In this case, if the part to be measured 1a is smooth, the reference light receiver 3a receives the strongest light, and the other light receivers 3b and 3c receive the angle γ as the light reception level becomes farther from the reference light receiver 3a. _b and γ _c , but if the measured portion 1a has irregularities, the functional relationship of the reflected light level is broken. By quantifying the degree of collapse, it is possible to evaluate the gloss of the measured section 1a.

[0009] Specifically, the brightness of the light source 2 I _i, the measured values of the light receiver 3a~3c as I _{m (m} = 1,2,3 ...) Assuming _{I m = I i × k '} × cos n γ (m = 1,2,3 ...) ···· made wherein each light receiver 3b other than the reference light receiver 3a, obtaining the n respectively for 3c. Here, since cosγ = 1 in the reference light receiver 3a, a constant k ′ can be obtained (k ′ = I ₁ / I _i ).

[0010] Calculate the formula for the other receivers 3b and 3c
And I_Two= I_i× k '× cosⁿγ_b= I₁× cosⁿγ_b .... I_Three= I_i× k '× cosⁿγ_c= I₁× cosⁿγ_c ··················································
Then, this n is the reflected light ray on the line including each optical axis.
Since it is an index indicating the degree of collapse of the bell,
By adding processing, gloss measurement correlated with visual perception
It becomes possible.

In the above description, each of the light receivers 3a to 3c is connected to the light source 2
Although the case where it arrange | positions on the vertical surface containing the optical axis of this and the normal line N was illustrated, you may arrange | position on the horizontal plane orthogonal to the normal line N,
In addition, they can be arranged three-dimensionally on both the vertical plane and the horizontal plane.

[0012]

As described above, according to the present invention, the reflected light can be multidimensionally captured by the plurality of light receivers, so that the measured value closer to the visual glossiness can be obtained as compared with the conventional apparatus. Obtainable.

[Brief description of the drawings]

FIG. 1 is a side view showing the concept of the device of the present invention.

FIG. 2 is a side view showing the concept of a conventional device.

[Explanation of symbols]

 1 Painted surface 1a Measured part 2 Light source 3a ~ 3c Receiver

Claims (1)

[Claims] 1. A light source for projecting light onto a part to be measured and a counterpart from the light source.
And a light receiver for receiving the emitted light,  Set the receiver several times, including on the reflection angle equal to the incident angle.
Location, and the measured values at each receiver, and the
Measures gloss based on the angle between the receiver and the angle of reflection
A gloss measuring device, characterized in that: