JPH01254061A - Optical reader - Google Patents

Abstract

PURPOSE:To accurately read a specific color picture on an original and to attain sharp reading by using a small output relatively with respect to a light emitting element used subsequently. CONSTITUTION:An original M is arranged to a read section and one element L1 is lighted in plural kinds of light emitting elements L1, L2, then an output stored in a storage means is used and a 1st discrimination means C4 to discriminate the existence of a picture on the original M as the result of detection of a detection means K using the output stored in the storage means is provided. Moreover, an output relatively smaller than the output stored in the lighting of other light emitting element L2 is used in the light emitting elements L1, L2 and a 2nd discrimination means C5 discriminating the presence of a color picture corresponding to the lighted color of other light emitting element L2 in the picture of the original depending on the result of detection of the detection means K together with the result of discrimination of the 1st discrimination means C4 is used. Thus, even if there is more or less fluctuation in the result of detection relating to the light emitting element L1 used with priority, misdiscrimination of the color picture corresponding to the lighted color of the light emitting element L2 used subsequently hardly takes place and the specific color of the picture on the original is read accurately.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] This invention is used for facsimile machines, copying machines,
The present invention relates to an optical image reading device that reads a color image written on a document or the like.

[Prior Art] This type of optical reading device has multiple light-emitting elements (hereinafter referred to as 1-ED) that emit light of different colors, and a second light-emitting element that irradiates a document with light from the light-emitting elements. 1 optical component (as an example, a light-emitting fiber or an irradiation mirror, etc.)
a second optical component (for example, a light-receiving fiber) that receives and transmits the reflected light from the document, and a light-receiving element (hereinafter referred to as PD) that receives the light transmitted through the light-receiving fiber.
a detection means for detecting the output of a light receiving element in the optical system; and a member having a constant reflectance at a position of the document relative to the optical system relative to the optical system. and causing the LED to emit light and detecting the output of the PD by the detection means, and detecting the plurality of types of LEDs so that the output of the detection means becomes a predetermined value.
control means for adjusting the light amount of the PD or the output of the PD.

In the above-mentioned optical image input device, in order to accurately read the color image on the document, a plurality of types of L are used, each of which emits light of a different color so that the output signal from the PD is at a constant level.
It was necessary to adjust the brightness of the ED. Conventionally, a so-called white level check has been used as a method for this adjustment. The light emitted from each LED is irradiated onto a white reference material (white member) via the light-emitting fiber, the PD receives the light via the light-receiving gA fiber, and the PD outputs a signal according to the amount of light. In this method, the brightness of each LED is determined so that the signal inputted to the detection means is constant when the detection means is used.

[Problems to be Solved by the Invention] Conventionally, this type of white level check has been performed by checking each LE against a white reference material placed in advance on the reading section before starting to read the document.
This is done every D. In the case of this optical reading device, after a white level check is performed, a light emitting element that emits multiple colors selectively emits light to illuminate the image on the document placed in the reading section, and the light is received. The element receives reflected light from the original, and the color of the image on the original is determined based on the detection result of the detection means connected to the light receiving element. When the color of an image is determined based on the detection results of this detection means, the detection results corresponding to light emitting elements of a certain color are preferentially used, and the detection results corresponding to light emitting elements of other colors are used preferentially. used in a subordinate manner.

For example, in the case of an optical reading device that is equipped with red and yellow LEDs and distinguishes between red, white, and black on a document, the yellow LED
Distinguish the presence of white and other colors (black and red) on the document by preferentially using the detection results when D irradiates,
Based on this, the red and black colors on the document are discriminated using the detection results when the red color ED is irradiated. However, when the color of the original is not white but gray, and a yellow LED for determining the presence of color illuminates the gray part of the original, the output voltage of the light receiving element is the standard used in the detection means. very close to the voltage. Furthermore, when a red LED is irradiated, the output of the light receiving element that receives the red reflected light also becomes very close to the reference voltage, and it may be determined that there is a red image on the document.

This invention was made to solve the above-mentioned deficiencies in the prior art, and after performing a white level check with a reference member having a constant reflectance, the light emitting element is determined using the data from the white level check. When a light emitting element emits light or outputs a light receiving element, by correcting the light emitting element of a specific color so that the data is relatively smaller than the preset data, it is possible to accurately display the specific color of the image on the document surface. The purpose is to provide an excellent optical reading device.

[Means for Solving the Problem] To achieve this object, according to the present invention, tIS1
As shown in the figure, there are multiple types of light emitting elements that emit light of multiple types of colors, L2, and the light irradiated to the reading section R that reads the irradiated light from the light emitting elements. an optical system including a light-receiving element P that receives light, an optical component T that transmits reflected light from the reading section to the light-receiving element, a detection means that detects the output of the light-receiving element, and the reading section for the optical system. A member W having a constant reflectance at the position of
arranging means C1 for arranging the plurality of types of light emitting elements relative to the optical system; after the arrangement of the arranging means is completed, each of the plurality of types of light emitting elements is made to emit light, and the detecting means detects the output of the light receiving element; adjustment means C2 for adjusting the light amount of the light emitting element or the output of the light receiving element so that the input of the detection means becomes a predetermined value; and the 3!1Iff
storage means C1 for storing the light amount of the light emitting element or the output of the light receiving element adjusted by the storage means; In an optical reading device that reads a color image on a document placed in a reading section based on the detection result of the detection means by selectively emitting light from different kinds of light emitting elements, an original 8% M is placed in the reading section. , when causing one of the plurality of types of light emitting elements to emit light, the presence of an image on the original document is determined based on the detection result of the detection means using the output stored in the storage means; 1 discriminator FiC4 and the document M is placed in the reading unit, and when the other light emitting elements of the plurality of types of light emitting elements emit light, the output is relatively smaller than the output stored in the storage means. Using the output, the original is detected by the detection result of the detection means.
A second discriminating means 92 CS is provided for discriminating the presence of an image of a color corresponding to the luminescent color of the other light emitting element among the images of H, together with the discriminating result of the first discriminating means.

[Operation 1] In the optical reading device having the above configuration, detection results corresponding to light emitting elements of a certain color are preferentially used to discriminate images on a document, and detection results corresponding to light emitting elements of other colors are preferentially used. When the corresponding detection results are used in a dependent manner to determine the color of an image, the output of the light-emitting elements used in the dependent manner is relatively smaller than the output stored in the storage means. Therefore, even if there is some variation in the detection results for the light-emitting elements that are used preferentially, the existence of that color is not determined in the detection results for the light-emitting elements that are used subordinately. Misjudgment of images of colors corresponding to the luminescent colors of light-emitting elements used for is less likely to occur.

[Embodiment 1] Hereinafter, an embodiment in which this invention is applied as a light emitting source in a three-color image input device of red, black, and white equipped with a 1° ED of two colors of red and yellow will be described with reference to the drawings. .

FIG. 2 shows a bronch diagram of this embodiment.

In the figure, 1 is a multiplexer, 2 is a charge conversion element as a light receiving element, 3 is a voltage comparator, and 4 is a D/
A converter, 5 is RAM, 6 is ROM that stores the light amount data table and other programs, 7 is CPU, 8
is a display device, D, ~Dn are reading points, C1 ~ Cn are drive control circuits, and Lrl ~ Lrn are red L that emits red light.
ED, Ly, ~Lyn are yellow LEDs that emit yellow light,
T, to Tn are light emitting side optical 7 eyers, and R1 to Rn are light receiving side optical fibers as optical components.

In response to a command sent according to a program stored in the ROM 6, the CPU 7 selects a plurality of light sources Lr, to Lrn based on the light amount data input from the ROM 6.

Adjust the amount of light from Ly+ to Lyn. That is, the CPU 7 sends light amount data to the D/A converter 4, and the output signal from the D/A converter 4 is outputted to the drive control circuits C7 to Cn via the multiplexer 1, which is in charge of time-division control, to perform drive control. Circuits C9 to C2n are each red L E D L
r, -Lrn, and each yellow LED Ly1-Lyn is selectively turned on. The light is transmitted through the corresponding light-emitting optical fiber T, ~
The reflected light that illuminates the points D1 to Dn on the document surface to be read through Tn is the corresponding light receiving side light 7 eye bar R.
The light is received at the end of the document side of 1 to Rn, and the fiber R9
~Rn is transmitted to the photoelectric conversion element 2 connected thereto.

The output from this photoelectric conversion element 2 is compared with a reference value by a comparator 3, and when this reference value is reached, the data input to the D/A converter 4 is transferred to each of the plurality of light emitting elements Lr.
1-Lrn+ Ly+-Lyn separately RAM5 and CPU7
is memorized.

FIG. 3 shows a chart 70 showing the operation of the white level check as the adjusting means and the setting of the amount of light emitted from the light emitting elements Lrn and Lyn in this embodiment.

First, in Step 1, after inputting 1 to the N Reno Star 9 used to specify the light emitting element for counting, and the M Reno Star used to specify the size of the light emission amount, in Step 2, the reading device is to the white reference value with a certain percentage. This corresponds to the placement means. In step 3, the nth drive control circuit Cn is specified based on the contents of the N register, and the RO is specified based on the contents of the M register.
Read and output the first test data from M6 (step 4). If the output of the comparator is equal to or higher than the reference value (SG=1) in step 5, the test data at that time is stored in the RA as a storage means as appropriate light amount data in step 6.
Store in M5. In step 7, Renosta N is 16
(In this case, the total number of red light emitting elements is 8 and the total number of yellow light emitting elements is 8.) If not, this operation is repeated until N=16 as shown in step 8. At this time, as shown in step 8, the M reno star is reset to 1''. Also, if N=16 in step 7, the CPU 7 stores the appropriate light amount emission data for the yellow LEDLyn in the RAM 5. (Step 9).The CPU 7 stores in the RAM 5 the light intensity that is two steps smaller than the appropriate light intensity emission data for the red L E D L rn as emission data (Step 10).
, the start on switch can be input (step 1)
1) By the way, if the output of the comparator to which the first test data is input does not exceed the reference value in step 5, as shown in step 10, the light intensity of the light emitting element is increased until I=13. 19. Step 20. Step 4. Repeat step 5. If it does not match the reference value when -=13, a failure is displayed on the display device 8 in step 21 and the process ends.

When the start switch is turned on, the CPU 7 sets the N register to 1 (step 12).

In step 13, the nth drive control circuit Cn is designated based on the contents of the N register. In step 14, the CPU 7 displays yellow LEDLyn and red LEDLyn.
The light emission data is read and output for each. C.P.
U7 stores the output of the comparator 3 in the RAM 5 in step 15.

The CPU 7 discriminates the color based on the output of the comparator 3 (step 16). Then, it is determined whether N is 16 (step 17), and steps 13 to 17 are repeated until N reaches 16 (step 18).

In this case, step 14 and step 15 are the first determining means and pltJ2! Corresponds to f4 alternative means.

Next, a reading operation for reading red and black colors on a document using this optical reading device will be explained.

After the original is set, a yellow LED Lyn attached to the reading head illuminates the background color of the original, and the reflected light is received by the photoelectric conversion element 2 and charged and converted to obtain an output. Further, an output is similarly obtained for the red LED Lrn. As a result, the reading results shown in the following table are obtained.

(Left below) Here, conventionally, each L is
I was adjusting the light intensity of E D Lyn and Lrn,
The CPU 5 sets the light emission amount data smaller than the appropriate light emission amount data to the red LEDLr, -Lrn so that the light emission amount of the red LED Lrn is narrowed down to the light emission amount of the yellow LEDLyn.
give against. This results in gray (low density black)
When the yellow LED Ly, ~Lyn is irradiated to the image of
Since the output voltage of EDLyn is considerably smaller than the reference voltage, it is no longer erroneously identified as "red".

Note that the present invention is not limited to the above-mentioned embodiments,
The configuration may be such that red, green, and black images are read using light emitting elements other than red and yellow LEDs, such as red, green, and yellow LEDs, as light emitting elements of multiple types of colors. Also, a reflective chain may be used instead of the plurality of light-emitting fibers, a lens may be used instead of the plurality of light-receiving fibers, and a light-receiving element ( (including AMP), and an A/D converter may be used instead of the comparator 3 as the detection means. Furthermore, the display device 8 constituting the detection means may be a buzzer that outputs sound, or an LE
It may also be a D lamp.

[Effect of the Invention 1] As explained above, according to the optical reading device of the present invention, an image of a specific color on a document can be accurately read. FIG. 3 is a 70-chart showing the operation of this embodiment.

In the figure, 1 is a multiplexer, 2 is a photoelectric conversion element, 3 is a voltage comparator, 4 is a D/A converter, and 5
HA RAM, 611 ROM, 711 CPU.

8 is a display device, D, ~Dn are reading points, CI-cn is a drive control circuit, L1 ~ Ln are LED %T + -
Tn is an optical fiber on the light emitting side, and R1-Rn is an optical fiber on the light receiving side.

Claims (1)

[Scope of Claims] 1. A plurality of types of light emitting elements each emitting light of a plurality of colors, and the light emitted from the light emitting elements is irradiated onto a reading section where reading is performed, and the light from the reading section is an optical system including a light-receiving element that receives light; an optical component that transmits light from the reading section to the light-receiving element; a detection means that detects an output of the light-receiving element; arranging means for arranging a member having a reflectance of adjusting means for adjusting the light amount of the light emitting element or the output of the light receiving element so that the input of the detecting means becomes a predetermined value; and the light amount of the light emitting element or the light receiving element adjusted by the adjusting means. storage means for storing the output of the light emitting element, and selectively causes the plurality of types of light emitting elements to emit light using the light amount of the light emitting element or the output of the light receiving element stored in the storage means to detect the detection means. In an optical reading device that reads a color image on a document placed in a reading section based on the result, when placing the document in the reading section and causing one of the plurality of types of light emitting elements to emit light, a first discriminating means for discriminating the presence of an image on a document based on the detection result of the detecting means using an output stored in a storage means; When making the other light emitting elements emit light, an output that is relatively smaller than the output stored in the storage means is used, and based on the detection result of the detection means, the other light emitting elements in the image on the document are detected. An optical reading device comprising: a second discriminating means for discriminating the presence of an image of a color corresponding to the emitted light color together with the discriminating result of the first discriminating means.