JPH01254821A - Colorimetric sensor - Google Patents

Abstract

PURPOSE:To decrease the fluctuation in the output of the colorimetric sensor by unequal light such as shadow by forming the colorimetric sensor to a circular shape. CONSTITUTION:The colorimetric sensor is constituted of red sensors 1, green sensors 2 and blue sensors 3. A fluctuation level decreases eventually when the unequal right such as shadow is generated on the lower light of a line a-a' when the incident light is projected on the sensor. More specifically, the area DELTAS irradiated only in the blue sensor 3 and the red sensor 1 as the unequal light is 0.0404 times the total photometric sensor area S at the max. Namely, the max. value DELTAS of the area where the shadow is generated with respect to the total area S is small and, therefore, the influence of the unequal light is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a colorimetric sensor that measures the color of light.

[Prior Art] FIG. 3 is a block diagram showing a conventional colorimetric sensor for measuring the color of light, which has a pattern in which color sensors are arranged radially.

In Fig. 3, one part l is the red component of light, which is photoelectrically converted R.
a red sensor of a filter and a light conversion element to which it is attached;
Part 2 is a G filter that photoelectrically converts a green component and a green sensor that is a photoelectric conversion element, and part 3 is a B filter that photoelectrically converts a blue component and a blue sensor that is a photoelectric conversion element.

With the above configuration, the red, green, and blue components of the incident light can be detected, and the color of the light can be measured. Further, each color sensor is set to an optimal size depending on its sensitivity.

In other words, the blue sensor with low sensitivity has a large area! 7! !
, red and green sensors with high intensity have a small area. In FIG. 3, the sensitivity ratio is assumed to be R:G:B=1:1:maintenance, and the area ratio is set to R:G:B=1:1:2.

In the configuration shown in Fig. 3, if a shadow is formed at the lower left (lower left of line a-a'), the amount of incident light will decrease only for the blue sensor 3 and the red sensor l, and the output of the blue sensor 3 and the red Since the output of the sensor l decreases, the incident light is judged to have weaker blue and red components than the actual incident light.

In Fig. 3, the area △S (the area surrounded by the two sides of the color sensor 'A11 and the line a-a') where only part of the blue sensor 3 and red sensor l is irradiated as light unevenness is the maximum. This is 0.0625 times the total colorimetric sensor area S. That is, each side is 1
Then, the total area S is s=1, and the maximum area of △S is △SMA
X = station x % x station = 18.

=0.0625 Also, if the number of divisions of each color sensor is further doubled,
The maximum value of ΔS, ΔS□8, is 0.0156 times the total area (% in FIG. 3).

[Problems to be Solved by the Invention] As mentioned above, in the conventional colorimetric sensor, when there are areas that are directly exposed to light and areas that are not exposed to light due to the formation of shadows on the colorimetric sensor, colorimetry cannot be performed. There was a problem that an error occurred in the sensor output.

This invention was made to solve such conventional problems, and even if light unevenness such as shadows occurs on the color sensor,
It is an object of the present invention to provide a colorimetric sensor that reduces the influence and does not cause errors in output.

[Means for Solving the Problems] In order to solve the above object, in the colorimetric sensor of the present invention, each color sensor is composed of a plurality of polygonal divided pieces extending radially from approximately the center of the colorimetric sensor. configured,
Moreover, the shape of the colorimetric sensor is circular.

[Function] By having the above configuration, it is possible to reduce fluctuations in the colorimetric output level due to light unevenness, and it is possible to increase the improvement effect when the number of divisions of each color sensor is increased.

[Embodiment] FIG. 1 is a configuration diagram of a colorimetric sensor showing an embodiment of the colorimetric sensor of the present invention, where l is a red sensor, 2 is a green sensor, and 3 is a blue sensor.

In the above configuration, when light is incident and, for example, light unevenness such as a shadow occurs at the lower left of the line a-a', the fluctuation level is set to the third level.
Compared to the conventional example shown in the figure, the amount is reduced. in particular,
As light unevenness, the area ΔS that is irradiated only on the blue sensor 3 and red sensor 1 is at most 0.04 of the total colorimetric sensor area S.
04 times. That is, if the radius is 1, the total area s = π・
12=π.

The maximum area Δs & lAX of ΔS is: △S ＾
, A×! π・12・3mu, −(1−sin3π/16
)x (1-cos3 w/16) x 54 x 2
Ayan is 0.127, so the entire surface is a! The ratio of S and ΔSMAX is ΔS MAX/S''; 0.127/π.
040, and the maximum value ΔS of the area where the shadow occurs on the entire surface MS is smaller than in the case of FIG. 3, so it can be seen that the influence of light unevenness is reduced.

FIG. 2 is a block diagram of a colorimetric sensor showing another embodiment of the present invention, in which 1 is a red sensor, 2 is a green sensor, and 3 is a blue sensor.

In this embodiment, the number of divisions of each color sensor is twice that of FIG. 1, that is, the number of divisions for each of the red sensor 1, &1 sensor 2, and blue sensor 3 is eight. Therefore, since the area of each divided piece is smaller, it is possible to further reduce fluctuations in the colorimetric sensor output due to the influence of light unevenness.

Specifically, the blue sensor 3. When a shadow (bottom left of line a-a') occurs in the area illuminated only by red sensor l, the area of the shadow is △
The ratio of the maximum value of S is o, oos times, and by doubling the number of divisions, it becomes about 18, which is more effective than the percentage of the conventional example shown in FIG. That is, if the radius is 1, then the entire surface g s = π ΔSl+lAX"π61 t, Gohe2- (1・5in
3 π/32)X (1-cos3 w/:12)X
3/2x 2 #0.0166ΔSMAX/S #0.
It becomes O05.

[Effects of the Invention] As explained above, by making the shape of the colorimetric sensor circular, this invention can reduce fluctuations in the colorimetric sensor output due to light unevenness such as shadows, and accurately determine the color of light. The goal was to measure and obtain accurate embellished color output.

In addition, by making the shape circular, it becomes more effective to improve the fluctuation value of the colorimetric sensor output due to light unevenness when the number of divisions of each color sensor is increased.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a colorimetric sensor showing an embodiment of the colorimetric sensor of the present invention, FIG. 2 is a block diagram of a colorimetric sensor showing another embodiment of the invention, and FIG. FIG. 2 is a configuration diagram showing a colorimetric sensor for measuring the color of . In the figure. l: Red sensor which is a photoelectric conversion element with a red filter added 2: Green sensor which is a photoelectric conversion element with a green filter added: Blue sensor which is a photoelectric conversion element with a blue filter Agent Patent attorney 1) Takashi Kita Sunny

Claims (1)

[Claims] In a colorimetric sensor having a plurality of color sensors each including a photoelectric conversion element that converts light into an electrical signal and a color filter that is added to the photoelectric conversion element and that transmits light in a specific wavelength range, each of the color sensors includes: . A colorimetric sensor comprising a plurality of polygonal divided pieces extending radially from substantially the center of the colorimetric sensor, the colorimetric sensor having a circular shape.