KR100403591B1 - Discrimanating method of print media - Google Patents

Discrimanating method of print media Download PDF

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Publication number
KR100403591B1
KR100403591B1 KR10-2001-0048736A KR20010048736A KR100403591B1 KR 100403591 B1 KR100403591 B1 KR 100403591B1 KR 20010048736 A KR20010048736 A KR 20010048736A KR 100403591 B1 KR100403591 B1 KR 100403591B1
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South Korea
Prior art keywords
light
paper
sheet
reflected
normalization
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KR10-2001-0048736A
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Korean (ko)
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KR20030014853A (en
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임대혁
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삼성전자주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/17—Ink jet characterised by ink handling
    • B41J2/175—Ink supply systems ; Circuit parts therefor
    • B41J2/17503—Ink cartridges
    • B41J2/17543—Cartridge presence detection or type identification
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/009—Detecting type of paper, e.g. by automatic reading of a code that is printed on a paper package or on a paper roll or by sensing the grade of translucency of the paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J11/00—Devices or arrangements  of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
    • B41J11/48—Apparatus for condensed record, tally strip, or like work using two or more papers, or sets of papers, e.g. devices for switching over from handling of copy material in sheet form to handling of copy material in continuous form and vice versa or point-of-sale printers comprising means for printing on continuous copy material, e.g. journal for tills, and on single sheets, e.g. cheques or receipts
    • B41J11/485—Means for selecting a type of copy material amongst different types of copy material in the printing apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
    • B41J2/451—Special optical means therefor, e.g. lenses, mirrors, focusing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
    • B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

본 발명은 인쇄매체 감별방법에 관하여 개시한다. 개시된 인쇄매체 감별방법은, 발광부와 수광부들을 구비하여 인쇄용 용지를 구별하는 미디어 센서가 용지이송경로 상에 급지된 상기 용지 상방에 위치하는 프린터에서의 용지감별방법에 있어서, (가) 상기 발광부로부터 상기 급지된 인쇄용 용지에 광을 조사한 후, 상기 용지에서 반사된 수직 방향의 광을 검출하는 제1수광부와, 상기 용지의 상방 수직선을 기준으로 상기 용지에 입사되는 각과 같은 크기의 각으로 반사되는 광을 검출하는 상기 제2수광부로부터 상기 용지로부터 반사된 광을 검출하는 단계; (나) 상기 제2수광부의 광의 세기를 상기 제1수광부의 광의 세기로 나누어 측정 비(ratio)를 구하는 단계; (다) 상기 측정 비(ratio)에, 상기 프린터에 장착된 상기 미디어 센서를 이용하여 보통용지에 대한 상기 측정 비(ratio)인 정규화 상수의 역수를 곱하는 정규화 단계; 및 (라) 상기 정규화된 값을 룩업테이블의 용지별 상기 정규화 값의 범위를 조회하여 해당되는 범위로부터 용지 종류를 판단하는 단계;를 구비한다. 이에 따르면, 미디어 센서를 사용하여 인쇄매체의 종류를 구별하는 데 있어서 인쇄매체로부터의 반사광의 분포가 겹치게 되는 인접한 인쇄매체들도 구별할 수 있는 이점이 있다.The present invention relates to a method for discriminating a print medium. Disclosed is a method for discriminating a printing medium in a printer having a light emitting unit and a light receiving unit, wherein a media sensor for distinguishing a paper for printing is located above the paper fed on a paper conveying path. Irradiated with light from the sheet of printing paper fed from the first sheet, the first light receiving unit detecting light in a vertical direction reflected from the sheet, and reflected at an angle equal to an angle incident on the sheet based on an upper vertical line of the sheet; Detecting light reflected from the paper from the second light receiving unit detecting light; (B) obtaining a measurement ratio by dividing the light intensity of the second light receiver by the light intensity of the first light receiver; (C) a normalization step of multiplying the measurement ratio by an inverse of a normalization constant that is the measurement ratio with respect to plain paper using the media sensor mounted to the printer; And (d) querying a range of the normalization value for each sheet of a lookup table for the normalized value to determine a paper type from a corresponding range. According to this, there is an advantage of distinguishing adjacent print media in which the distribution of reflected light from the print media overlaps in distinguishing the type of the print media using the media sensor.

Description

인쇄매체 감별방법{Discrimanating method of print media}Discrimination method of print media

본 발명은 인쇄매체 감별방법에 관한 것으로서, 더욱 상세하게는 프린터에서 급지되는 인쇄매체의 종류를 효율적으로 감별하는 방법에 관한 것이다.The present invention relates to a method for discriminating print media, and more particularly, to a method for efficiently discriminating types of print media fed from a printer.

도 1은 종래의 미국특허 제5,139,339호에 개시된 미디어 센서(media sensor)의 구성을 보여주는 도면이다.FIG. 1 is a diagram illustrating a configuration of a media sensor disclosed in US Pat. No. 5,139,339.

도면을 참조하면, 미디어 센서(30)는 인쇄용 용지(35)에 광을 조사하는 발광부(31)와 그 광을 검출하는 두 개의 수광부(32,33)를 구비한다.Referring to the drawings, the media sensor 30 includes a light emitting part 31 for irradiating light onto the printing paper 35 and two light receiving parts 32 and 33 for detecting the light.

상기 수광부(32,33)는 인쇄매체(35)로부터 수직 상방에 위치하는 미디어 센서(30)의 중앙부에서 상기 인쇄매체(35)의 수직 상방에 위치하는 제1수광부(32)와 상기 발광부(31)로부터 입사된 광의 입사각과 같은 크기의 반사각으로 반사되는 광을 수광하는 제2수광부(33)를 구비한다.The light receiving units 32 and 33 may include a first light receiving unit 32 and a light emitting unit positioned vertically above the printing medium 35 at the center of the media sensor 30 positioned vertically above the printing medium 35. And a second light receiving portion 33 for receiving light reflected at a reflection angle of the same magnitude as the incident angle of the light incident from the light 31).

인쇄용 용지가 수납된 급지 카세트(미도시)로부터 용지이송경로를 따라 인쇄부(미도시)에 용지를 공급하는 프린터(미도시)에 있어서, 인쇄경로에 설치된 미디어 센서(media sensor: 30)의 발광부(31)로부터 인쇄매체(35)에 광을 조사한 후, 그 인쇄매체(35)로부터 반사된 광을 두 개의 수광부(32,33)로 수광하여 그 광의 세기로부터 보통 용지(plain paper)와 투명 용지(transparent paper)를 구별함으로써 그 구별결과를 인쇄에 반영하는 기술이 상기 미국특허에 개시되어 있다.In a printer (not shown) that supplies paper to a printing unit (not shown) from a paper cassette (not shown) containing printing paper along a paper conveyance path, light of a media sensor (30) installed in the printing path is emitted. After irradiating light to the print medium 35 from the unit 31, the light reflected from the print medium 35 is received by the two light receiving units 32 and 33, and the plain paper and the transparent paper from the intensity of the light. A technique for reflecting the result of the distinction in printing by distinguishing transparent paper is disclosed in the above-mentioned US patent.

도 2는 도 1의 미디어 센서(30)가 인쇄경로에 설치된 다수의 프린터에 각각 투명 용지(transparent paper), 광택 용지(glossy paper), 코팅 용지(coated paper) 및 보통 용지(plain paper)를 인입시켜서 측정하여 계산한 제1수광부(32)의 광의 세기에 대한 제2수광부(33)의 광의 세기의 비(ratio)를 나타낸 분포도이다.FIG. 2 shows transparent paper, glossy paper, coated paper and plain paper in a plurality of printers in which the media sensor 30 of FIG. 1 is installed in a printing path. It is a distribution chart which shows the ratio of the intensity | strength of the light of the 2nd light receiving part 33 with respect to the intensity of the light of the 1st light receiving part 32 measured and calculated.

도 2에 도시된 바와 같이 상기 광의 세기의 비가 일정치 않고 넓은 범위를 가지는 것은 미디어 센서(30) 자체의 오차, 미디어 센서(30)의 장착 오차 등에 기인한다. 보통 용지와 투명 용지 사이는 그 측정 비(ratio)가 크게 차이가 나기 때문에 미디어 센서(30)의 오차가 크더라도 분명하게 구별이 되나, 코팅 용지와 보통용지 사이에는 도 2에 도시된 바와 같이 겹치는 영역이 존재하기 때문에 일괄적으로 수광부(32,33)의 강도 비(ratio)의 범위를 정하여 용지 종류를 구별하기가 곤란하며, 따라서 프린터마다 설치된 미디어 센서로 인쇄매체의 수광부의 강도 비를 측정하여 인쇄매체의 종류를 구별하는 범위를 프린터마다 정해야 하는 불편한 점이 있었다.As shown in FIG. 2, the ratio of the light intensity is not constant and has a wide range due to an error of the media sensor 30 itself, a mounting error of the media sensor 30, and the like. Since the measurement ratio is significantly different between the plain paper and the transparent paper, even if the error of the media sensor 30 is large, it is clearly distinguished. However, the overlap between the coated paper and the plain paper as shown in FIG. Since there is an area, it is difficult to discriminate paper types by collectively setting the range of intensity ratios of the light receiving units 32 and 33. Therefore, the intensity ratio of the light receiving unit of the print medium is measured by a media sensor provided for each printer. There is an inconvenience in that each printer has to set a range for distinguishing types of print media.

따라서 본 발명의 목적은 상기의 문제점을 개선하기 위해 창출된 것으로서, 본 발명의 목적은 미디어 센서를 갖춘 프린터에서 코팅 용지와 보통 용지를 구별하는 인쇄매체 감별방법을 제공하는 것이다.Accordingly, an object of the present invention was created to improve the above problems, and an object of the present invention is to provide a printing medium discrimination method for distinguishing coated paper from plain paper in a printer equipped with a media sensor.

도 1은 종래의 인쇄매체 감별센서를 보여주는 도면,1 is a view showing a conventional print media discrimination sensor,

도 2는 도 1의 인쇄매체 감별센서로 측정한 인쇄매체별 측정 비(ratio)의 분포도,FIG. 2 is a distribution diagram of a measurement ratio for each print medium measured by the print medium discrimination sensor of FIG. 1;

도 3은 본 발명의 바람직한 실시예에 의한 인쇄매체 감별방법의 흐름도,3 is a flowchart of a method for discriminating a print medium according to a preferred embodiment of the present invention;

도 4는 본 발명의 바람직한 실시예에 의한 인쇄매체별 측정 비의 분포도,4 is a distribution chart of measurement ratios for respective print media according to a preferred embodiment of the present invention;

도 5는 본 발명의 바람직한 실시예에 의한 정규화 방법의 흐름도.5 is a flowchart of a normalization method according to a preferred embodiment of the present invention.

*도면의 주요 부분에 대한 부호설명** Description of Signs of Major Parts of Drawings *

30: 미디어 센서(media sensor) 31: 발광부30: media sensor 31: light emitting unit

32: 제1수광부 33: 제2수광부32: first light receiver 33: second light receiver

상기의 목적을 달성하기 위하여 본 발명의 인쇄매체 감별방법은, 발광부와 수광부들을 구비하여 인쇄용 용지를 구별하는 미디어 센서가 용지이송경로 상에 급지된 상기 용지 상방에 위치하는 프린터의 용지감별방법에 있어서, (가) 상기 발광부로부터 상기 급지된 인쇄용 용지에 광을 조사한 후, 상기 용지의 수직 방향의 광을 검출하는 제1수광부와, 상기 용지의 상방 수직선을 기준으로 상기 용지에 입사되는 각과 같은 크기의 각으로 반사되는 광을 검출하는 상기 제2수광부로부터 상기 용지로부터 반사된 광을 검출하는 단계; (나) 상기 제2수광부의 광의 세기를 상기 제1수광부의 광의 세기로 나누어 측정 비(ratio)를 구하는 단계; (다) 상기 측정 비(ratio)에, 상기 프린터에 장착된 상기 미디어 센서를 이용하여 보통용지에 대한 상기 측정 비(ratio)인 정규화 상수의 역수를 곱하는 정규화 단계; 및 (라) 상기정규화된 값을 룩업테이블의 용지별 상기 정규화 값의 범위를 조회하여 해당되는 범위로부터 용지 종류를 판단하는 단계;를 구비한다.In order to achieve the above object, the printing medium discrimination method of the present invention is directed to a paper discrimination method of a printer having a light emitting part and a light receiving part, wherein a media sensor for distinguishing printing paper is located above the paper fed on the paper transport path. (A) The first light receiving unit for detecting the light in the vertical direction of the paper after irradiating the paper to the fed printing paper from the light emitting unit, and the angle incident on the paper on the basis of the upper vertical line of the paper Detecting light reflected from the paper from the second light receiving portion for detecting light reflected at an angle of magnitude; (B) obtaining a measurement ratio by dividing the light intensity of the second light receiver by the light intensity of the first light receiver; (C) a normalization step of multiplying the measurement ratio by an inverse of a normalization constant that is the measurement ratio with respect to plain paper using the media sensor mounted to the printer; And (d) querying the normalized value for a range of the normalization value for each sheet of a lookup table to determine a paper type from a corresponding range.

상기 (가)단계는, (가1) 상기 검출 신호를 증폭하는 단계; 및 (가2) 상기 증폭된 신호를 아날로그/디지털 변환기를 통해 광의 세기를 구하는 단계;를 더 구비하는 것이 바람직하다.The step (a) may include (a) amplifying the detection signal; And (a) obtaining the intensity of the light from the amplified signal through an analog-digital converter.

또한, 상기 (다)단계의 상기 정규화 상수는 상기 프린터에 장착된 상기 미디어 센서를 사용하여 상기 보통용지에 대해서 상기 (가) 및 (나)단계를 거쳐서 구하는 값이다.In addition, the normalization constant of the step (c) is a value obtained through the steps (a) and (b) for the plain paper using the media sensor mounted in the printer.

이하, 첨부된 도면들을 참조하여 본 발명의 인쇄매체 감별방법에 따른 바람직한 실시예를 상세히 설명한다.Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment according to the printing medium discrimination method of the present invention in detail.

도 3은 본 발명의 바람직한 실시예에 의한 인쇄매체 감별방법의 흐름도이며, 도 4는 본 발명의 바람직한 실시예에 의한 인쇄매체별 측정 비의 분포도이다.3 is a flowchart of a method for discriminating a print medium according to a preferred embodiment of the present invention, and FIG. 4 is a distribution chart of measurement ratios for each print medium according to a preferred embodiment of the present invention.

아래의 설명에서 도 1에 도시된 미디어 센서가 인용된다.In the description below, the media sensor shown in FIG. 1 is cited.

먼저 인쇄 모드가 온(ON)되면(S11), 인쇄매체(35)를 인쇄부에 공급한다(S12).First, when the print mode is ON (S11), the print medium 35 is supplied to the printing unit (S12).

공급된 용지(35)에는 발광부(31)로부터 광을 조사하며, 그 용지(35)로부터 반사된 광은 상기 용지(35)에 수직으로 상방에 위치하는 제1수광부(31)와, 상기 용지(35)의 수직선을 기준으로 상기 용지(35)에 입사되는 각과 같은 크기의 각으로 반사되는 곳에 위치한 제2수광부(33)에 의해 반사광을 전기적 신호로서 검출한다(S13). 검출된 광은 수광부(32,33)에서 전기적인 신호로 검출되나 그 크기가 작으므로 증폭신호기를 거쳐서 증폭되고 그 신호가 아날로그/디지털 변환기를 통해 광의 세기로 표현된다.The paper 35 supplied is irradiated with light from the light emitting unit 31, and the light reflected from the paper 35 is first-receiving unit 31 positioned upwardly perpendicular to the paper 35, and the paper. The reflected light is detected as an electrical signal by the second light receiver 33 located at a position reflected by an angle equal to the angle incident on the paper 35 with respect to the vertical line of 35 (S13). The detected light is detected as an electrical signal in the light receiving units 32 and 33, but because of its small size, the light is amplified through an amplifying signal and the signal is expressed as the light intensity through an analog / digital converter.

상기 제2수광부(33)에서 측정된 광의 세기(이하 "I2"라 정의함)를 제1수광부(32)의 광의 세기(이하 "I1"라 정의함)로 나누어서 수학식 1과 같이 측정 비(ratio)로 한다(S14).The intensity of light measured by the second light receiver 33 (hereinafter referred to as " I2 ") is divided by the light intensity of the first light receiver 32 (hereinafter referred to as " I1 ") to determine the measurement ratio ( ratio) (S14).

다음에 미리 저장된 정규화(normalization) 상수인 일반 용지의 측정 비(ratio)의 역수를 상기 측정 비(ratio)에 곱하는 정규화를 행한다(S15). 이와 같이 정규화를 하는 것은 프린터에 설치된 미디어 센서(30)로부터의 오차를 동일 프린터로 측정되는 용지들에 일률적으로 반영함으써 용지별 정규화된 값을 차별화하기 위한 것이다.Next, normalization is performed by multiplying the measurement ratio by the inverse of the measurement ratio of the plain paper which is a previously stored normalization constant (S15). This normalization is to differentiate the normalized value for each paper by uniformly reflecting the error from the media sensor 30 installed in the printer to the sheets measured by the same printer.

따라서 도 4에 도시된 바와 같이, 본 발명의 정규화에 따른 값의 분포도로부터 보통용지와 코팅용지는 명확하게 식별됨을 잘 알 수 있다.Therefore, as shown in Figure 4, it can be seen that the plain paper and the coated paper is clearly identified from the distribution of the values according to the normalization of the present invention.

상기 정규화된 값을 룩업테이블(LUT)의 용지별 측정 비(ratio)의 범위에 조회하여 상기 정규화된 값이 해당되는 인쇄매체의 종류를 판정한다(S16). 표 1은 도 4를 참조하여 정규화 값의 범위를 정한 룩업테이블의 일 예를 나타낸 것이다.The normalized value is referred to a range of measurement ratios for each sheet of a lookup table (LUT) to determine the type of print medium to which the normalized value corresponds. Table 1 shows an example of a lookup table in which a range of normalization values is defined with reference to FIG. 4.

이에 따라서 판정된 인쇄매체의 종류와 인쇄매체별로 최적화시킨 인쇄 파일의 이미지가 정합(matching)한 지를 판단하여(S17), 부정합(mismatching)한 경우에는 인쇄매체에 맞는 인쇄파일의 이미지로 변경하여(S18) 인쇄한다(S19).Accordingly, it is determined whether the image of the print file optimized for each print medium and the determined print medium is matched (S17), and when mismatching is performed, the image is changed to the image of the print file suitable for the print medium ( S18) Print (S19).

도 5는 본 발명의 바람직한 실시예에 의한 정규화 방법의 흐름도이다.5 is a flowchart of a normalization method according to a preferred embodiment of the present invention.

도 1을 참조하여 설명하면, 정규화 모드가 선택되면(S31) 보통 용지(35)를 용지 이송경로로 인입시켜서 미디어 센서(30) 하방에 오게 한다(S32).Referring to FIG. 1, when the normalization mode is selected (S31), the plain paper 35 is pulled into the paper feed path so as to be below the media sensor 30 (S32).

미디어 센서(30)의 발광부(31)로부터 광을 보통 용지(35)에 조사하고, 그 용지(35)로부터 반사된 광을 제1수광부(31)와 제2수광부(32)로부터 검출한 후, 그 검출신호를 증폭신호기를 거쳐서 증폭시키고, 그 증폭된 신호가 아날로그/디지털 변환기를 통해 광의 세기로 표현된다.After irradiating light onto the plain paper 35 from the light emitting unit 31 of the media sensor 30, and detecting the light reflected from the paper 35 from the first light receiving unit 31 and the second light receiving unit 32. The amplified signal is amplified by an amplifying signal, and the amplified signal is expressed as light intensity through an analog / digital converter.

상기 제2수광부(33)에서 측정된 광의 세기(이하 "N2"라 정의함)를 제1수광부(32)의 광의 세기(이하 "N1"라 정의함)로 나누어서 수학식 2와 같이 보통용지의 측정 비(ratio)를 정규화 상수로 저장하며(S34), 상기 S15 단계에서 정규화시 사용한다.The intensity of the light measured by the second light receiver 33 (hereinafter, defined as " N2 ") is divided by the light intensity of the first light receiver 32 (hereinafter, defined as " N1 ") and is defined as in Equation (2). The measurement ratio is stored as a normalization constant (S34) and used for normalization in step S15.

이상에서 설명한 바와 같이 본 발명에 따른 인쇄매체 판별방법을 적용하면 미디어 센서를 사용하여 인쇄매체의 종류를 구별하는 데 있어서 인쇄매체로부터의 반사광의 분포가 겹치게 되는 인접한 인쇄매체들도 정규화된 측정비를 적용하여 구별할 수 있으므로, 프린터별로 용지 구별범위를 설정할 필요가 없이 일괄적으로 그 차별범위를 정할 수 있는 이점이 있다.As described above, when the method for determining a print medium according to the present invention is applied, adjacent print media in which the distribution of reflected light from the print media overlap in the classification of the print media using the media sensor also have a normalized measurement ratio. Since it can be distinguished by application, there is an advantage in that the discriminating range can be collectively determined without the need to set the sheet discriminating range for each printer.

본 발명은 도면을 참조하여 실시예를 참고로 설명되었으나, 이는 예시적인 것에 불과하며, 당해 분야에서 통상의 지식을 가진 자라면 이로부터 다양한 변형 및 균등한 실시예가 가능하다는 점을 이해할 것이다. 따라서, 본 발명의 진정한 기술적 보호범위는 첨부된 특허청구범위에 한해서 정해져야 할 것이다.Although the present invention has been described with reference to the embodiments with reference to the drawings, this is merely exemplary, it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined only by the appended claims.

Claims (3)

발광부와 수광부들을 구비하여 인쇄용 용지를 구별하는 미디어 센서가 용지이송경로 상에 급지된 상기 용지 상방에 위치하는 프린터에서의 용지감별방법에 있어서,A paper discrimination method in a printer having a light emitting unit and a light receiving unit, wherein a media sensor for discriminating printing paper is located above the paper fed on the paper transport path. (가) 상기 발광부로부터 상기 급지된 인쇄용 용지에 광을 조사한 후, 상기 용지에서 반사된 수직 방향의 광을 검출하는 제1수광부와, 상기 용지의 상방 수직선을 기준으로 상기 용지에 입사되는 각과 같은 크기의 각으로 반사되는 광을 검출하는 상기 제2수광부로부터 상기 용지로부터 반사된 광을 검출하는 단계;(A) a first light receiving unit which detects light in the vertical direction reflected from the paper after irradiating light onto the paper for printing fed from the light emitting unit; Detecting light reflected from the paper from the second light receiving portion for detecting light reflected at an angle of magnitude; (나) 상기 제2수광부의 광의 세기를 상기 제1수광부의 광의 세기로 나누어 측정 비(ratio)를 구하는 단계;(B) obtaining a measurement ratio by dividing the light intensity of the second light receiver by the light intensity of the first light receiver; (다) 상기 측정 비(ratio)에, 상기 프린터에 장착된 상기 미디어 센서를 이용하여 보통용지에 대한 상기 측정 비(ratio)인 정규화 상수의 역수를 곱하는 정규화 단계; 및(C) a normalization step of multiplying the measurement ratio by an inverse of a normalization constant that is the measurement ratio with respect to plain paper using the media sensor mounted to the printer; And (라) 상기 정규화된 값을 룩업테이블의 용지별 상기 정규화 값의 범위를 조회하여 해당되는 범위로부터 용지 종류를 판단하는 단계;를 구비하며,(D) querying a range of the normalization value for each sheet of a lookup table for the normalized value, and determining a paper type from a corresponding range; 상기 (다)단계의 상기 정규화 상수는 상기 프린터에 장착된 상기 미디어 센서를 사용하여 상기 보통용지에 대해서 상기 (가) 및 (나)단계를 거쳐서 구하는 값인 것을 특징으로 하는 인쇄매체 감별방법.And the normalization constant of step (c) is a value obtained by the steps (a) and (b) of the plain paper using the media sensor mounted on the printer. 제 1 항에 있어서, 상기 (가)단계는,According to claim 1, wherein the step (a), (가1) 상기 검출 신호를 증폭하는 단계; 및(A1) amplifying the detection signal; And (가2) 상기 증폭된 신호를 아날로그/디지털 변환기를 통해 광의 세기를 구하는 단계;를 더 구비하는 것을 특징으로 하는 인쇄매체 감별방법.(A 2) obtaining the intensity of light through the amplified signal through an analog-to-digital converter; further comprising a print medium discrimination method. 삭제delete
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