• 한국광학회지
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• 제21권3호
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• pp.111-117
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• 2010

레이저 프린터 및 OA복합기기 내부의 감광 드럼에 빛을 조사하는 핵심 광 모듈인 Laser Scanning Unit(LSU)의 광원으로 사용할 수 있는 발진파장 780 nm, 광 출력 10 mW의 모노리식 집적형 8빔 레이저 다이오드를 개발하였다. 개발된 8-빔 소자의 레이저 빔들의 각각의 물리적 간격은 $30\;{\mu}m$ 이며, 각 빔을 독립적으로 작동시키기 위해서, 공중배선공정을 신규로 개발하였다. 개발된 8빔 레이저 다이오드의 전기 및 광학적 특성 측정 결과 레이저 프린터 및 복합기의 LSU에 사용 가능함을 검증하였다.

• 한국소음진동공학회논문집
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• 제22권9호
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• pp.853-860
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• 2012

This paper identifies a cause of pick up noise in a laser printer and a relationship between pick up noise and major components related to pick up noise. A pick up sound is affected by many components such as spring force, spring constant, and friction coefficient. Objective evaluation for the pick up sound is difficult because of back ground sound such as operating sound. Especially, a sound between a friction pad and a paper in the process of printing has become an essential issue in an aspect of quality evaluation. However the existing criteria for determining the above sound have solely relied on human's subjective judgments; which highlights the requirement to objectify these criteria. In this paper, the standard of existing pick up noise is established by finding the tonality, which is a psychoacoustic parameter, of noticeable limit sound level. Based on the findings of the method, the study has found factors which cause pick up noise and suggests the substitution of following components of printers such as spring constants, spring force, and the quality of friction pads. As a result, it is confirmed that the proposed pick up noise index has usefulness to classify whether existence of pick up noise with an objective evaluation and not to occur the noise based on design optimized combination of laser printer components.

• KSTLE International Journal
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• 제2권2호
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• pp.146-149
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• 2001

Recently, laser printers have been developed to have high-speed laser scanner with hydrodynamic bearings. Among the bearings, herringbone grooved bearing (HGB) produces hydrodynamic pressure by high-speed rotating and so make the surfaces between the shaft and sleeve separated. Accordingly, the bearings with non-contact rotation are suitable to high-speed rotating and have long bearing life and reliability. HGB is a kind of journal bearing and uses oil for a lubricant. HGB has excellent stiffness and load carrying capacity. Also, HGB is leakage-free due to groove pumping action. Consequently, HGB is valuable to be applied to high-performance devices such as hard disk drive, copier, and so on.

• 소성∙가공
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• 제18권2호
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• pp.150-155
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• 2009

A shaft for laser printers has to be produced with high dimensional accuracy of a few micrometers. Most companies produce the shaft, therefore, by machining. These days, forging process is tried to be employed in manufacturing the shaft for productivity. In this study, the dimensional inaccuracy of straightness is studied and the underfill is not focused because the shaft shape is simple and the load capacity of press is sufficient. The straightness and concentricity of the shaft is important for the operation of a laser printer. Many design parameters such as preform shapes, tooling dimensions, forging load, and billet geometries may affect on the dimensional accuracy. In the forging process of shafts, a billet which is cut from wires is used. The billet, therefore, may be a little bit curved but not always straight. The elastic recovery is considered to cause the dimensional inaccuracy. Therefore, the effect of the forging load on the elastic recovery and straightness is investigated through the finite element analyses using DEFORM-3D and ABAQUS.

• 한국기계가공학회지
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• 제20권6호
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• pp.114-120
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• 2021

This study is focused on the root mean square and peak-to-valley based on the injection conditions of the f-theta lens, one of the main components of laser printers and laser scanning systems. The f-theta lens of an aspherical plastic lens requires ultra-preaction. Injection molding is typically used for the mass production of aspherical plastic lenses. In the injection-molding method, the resin in the lens shape is filled with the resin after melting the plastic pellets at a constant temperature and then cooled. It is necessary to maintain a uniform injection molding system to produce high-quality lenses. These injection-molding systems are influenced by different factors, such as pressure, speed, temperature, mold, and cooling. It is possible to obtain a lens that exhibits the optical characteristics required to achieve harmony. We investigated the root mean square and peak-to-valley caused by variations in temperature, a critical parameter in the melting and cooling of plastic resins generated inside and outside the injection mold.

• 한국기계가공학회지
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• 제20권9호
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• pp.20-27
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• 2021

The effective surface of lens was studied for injection molding process and to enable mass production of f-theta lens, which is the primary component of laser printers and laser scanning systems. Injection molding is an optimal method if f-theta lens is frequently used for the mass production of plastic lenses as an aspherical lens that requires ultra-precision. A uniform injection molding system should be maintained to produce high quality lenses. Additionally, to maintain these injection molding systems, various factors such as pressure, speed, temperature, mold and cooling should be considered. However, a lens with the optical characteristics of an f-theta lens can be obtained. The effects of melting and cooling of plastic resin on the effective surface of f-theta lenses and the numerous factors that affect the injection molding process were studied.

• 한국가구학회지
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• 제26권4호
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• pp.383-391
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• 2015

In recent years the industry has utilized some of the 3D printers in the manufacturing process a trend which spread also a personal desktop 3D printer priced. The 3D printer can create the 3D object by using an ink or a laser instead of the powders, and various liquid plastic material. Properties of 3D printers are liquid, solid, powder and raw materials are also classified as varied. New ideas and processes in the form of designer furniture, becoming increasingly evolved through the development of materials and technologies. Science, art and technology combine to create a new aesthetic for the complex and free binding structure is a combination of design and materials are available in craft and the structure appears not showing. 3D scanning was not simply continue to develop as the production process by a variety of tools and content transformation. Create new mathematical tables and chairs designed by the theory fit the digital age shows a coupling structure with decoration into small pieces. It has created a new craft technique in the digital age.

• 한국산학기술학회논문지
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• 제19권10호
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• pp.346-351
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• 2018

금속 3D 프린팅 기술은 레이저 빔의 초점에 금속분말을 주입하는 방식에 따라 대표적으로 PBF(Powder Bed Fusion)방식과 DED(Direct Energy Deposition)방식으로 나뉜다. DED 방식은 금속 분말 도포와 동시에 레이저를 조사하여 3차원 구조물을 제작하는 금속 3D 프린팅 기술이고, PBF 방식은 일정 높이로 3차원 그래픽을 슬라이싱 한 후 한 층씩 금속 분말을 적층하여 레이저를 이용해 3차원 구조물을 제조하는 방식이다. DED 방식을 사용하면 레이저 클래딩, 금속 용접 등에는 강점을 가지지만 3D 형상을 제작할 경우 밀도가 낮아지는 문제점이 발생한다. DED 방식에서의 구조체 밀도 문제를 해결하기 위해 PBF 방식을 도입하면 상대적으로 밀도가 높은 3차원 구조물을 제작하는데 용이하다. 본 논문에서는 갈바노 스캐너와 광섬유로 전송되는 Nd:YAG 레이저 빔을 이용한 약 $30{\mu}m$ 크기의 스테인리스 강 분말을 이용하는 PBF 방식의 3차원 프린터를 제작하고, 이를 이용하여 얇은 금속 구조물을 제작하였다. 또한 레이저의 조사 횟수, 출력, 초점 크기, 스캐닝 속도에 따른 선폭의 최적조건을 찾았으며, 그 결과 최적 조건은 레이저 조사 횟수 2회, 출력 30 W, 초점 크기 $28.7{\mu}m$, 스캐닝 속도 200 mm/s에서 최소 선폭은 약 $85.3{\mu}m$로 측정되었다.

• 한국디지털건축인테리어학회논문집
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• 제12권1호
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• pp.25-33
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• 2012

Ever since the local interior and architecture design industry adopted Digital fabrication modeling tool for its design operation in early 1990's, working environment has been changing. The Purpose of study is to analyze the digital Architecture fabrication modeling for digital design education in academy course. Digital Design Tools, Digital Space and Form, Digital Materiality and Digital Production. The Digital fabrication modeling is and important role in a traditional design process and digital design process. It is comprised of digital input devices(3D digitizer, 3D design tools) and digital output devices(cutting plotters, laser cut, CNC machines, 3D printers). Digital input devices can be shift a traditional design process to digital design process. Digital output devices are the principle of digital fabrication by CAD/CAM. Also, the result of this study provide the fundamental data for physical resources and digital design curriculum in KAAB.

• 한국문헌정보학회지
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• 제52권1호
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• pp.425-446
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• 2018

본 연구에서는 국내 대학도서관 메이커스페이스 도입의 초기 단계인 현 시점에서 메이커스페이스가 대학도서관의 지속가능한 디지털리터러시 교육 공간 및 서비스로 발전하기 위한 운영방안을 모색하고자 하였다. 이를 위해 국내외 대학도서관 메이커스페이스와 관련된 문헌 및 사례조사를 통해 다양한 프로그램 개발, 재정지원, 교육 효과 및 디지털리터러시와 평생학습 등의 도서관 목적과의 연계성 등을 검토하였다. 또한 국내 대학도서관 사서를 대상으로 설문조사를 실시하여 대학도서관 메이커스페이스의 필요성, 효과성, 활용성에 대한 사서의 인식 등을 조사 분석하였다. 이를 통해 대학도서관의 메이커스페이스가 단순한 3D 프린터, 레이저 커터 등의 새로운 기기를 제공하는 창조 및 협업공간을 넘어 메이커스페이스의 구축이 대학도서관의 디지털리터러시 교육 목표에 어떻게 부합되는지의 이슈와 더 나아가서 대학의 근원적 사명인 '창의적인 인재 양성'이란 교육적 사명과 연계할 수 있는 운영방안이 제시되었다.