[특허]Positive pressure drop-on-demand printing

Massachusetts Institute of Technology

검색어에 아래의 연산자를 사용하시면 더 정확한 검색결과를 얻을 수 있습니다.
검색연산자

검색도움말
검색연산자	기능	검색시 예
()	우선순위가 가장 높은 연산자	예1) (나노 (기계 \| machine))
공백	두 개의 검색어(식)을 모두 포함하고 있는 문서 검색	예1) (나노 기계) 예2) 나노 장영실
\|	두 개의 검색어(식) 중 하나 이상 포함하고 있는 문서 검색	예1) (줄기세포 \| 면역) 예2) 줄기세포 \| 장영실
!	NOT 이후에 있는 검색어가 포함된 문서는 제외	예1) (황금 !백금) 예2) !image
*	검색어의 *란에 0개 이상의 임의의 문자가 포함된 문서 검색	예) semi*
""	따옴표 내의 구문과 완전히 일치하는 문서만 검색	예) "Transform and Quantization"

과학기술 지식인프라 ScienceON

연합인증

연합인증 가입 기관의 연구자들은 소속기관의 인증정보(ID와 암호)를 이용해 다른 대학, 연구기관, 서비스 공급자의 다양한 온라인 자원과 연구 데이터를 이용할 수 있습니다.

이는 여행자가 자국에서 발행 받은 여권으로 세계 각국을 자유롭게 여행할 수 있는 것과 같습니다.

연합인증으로 이용이 가능한 서비스는 NTIS, DataON, Edison, Kafe, Webinar 등이 있습니다.

한번의 인증절차만으로 연합인증 가입 서비스에 추가 로그인 없이 이용이 가능합니다.

다만, 연합인증을 위해서는 최초 1회만 인증 절차가 필요합니다. (회원이 아닐 경우 회원 가입이 필요합니다.)

연합인증 절차는 다음과 같습니다.

최초이용시에는
ScienceON에 로그인 → 연합인증 서비스 접속 → 로그인 (본인 확인 또는 회원가입) → 서비스 이용

그 이후에는
ScienceON 로그인 → 연합인증 서비스 접속 → 서비스 이용

연합인증을 활용하시면 KISTI가 제공하는 다양한 서비스를 편리하게 이용하실 수 있습니다.

특허 상세정보

MyON담기

내보내기 페이스북 공유 트위터 공유 카카오톡 공유

Positive pressure drop-on-demand printing

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B05B-017/04 A62C-031/02 A62C-031/00
미국특허분류(USC)	239/011; 239/007; 239/390; 239/397
출원번호	US-0411356 (2003-04-10)
발명자 / 주소	Sachs,Emanuel M. Gleason,Blake W. Serdy,James G.
출원인 / 주소	Massachusetts Institute of Technology
인용정보	피인용 횟수 : 9 인용 특허 : 53

초록
▼

A drop on demand printer has a nozzle with an orifice and a surrounding annular land. Surrounding the land is an edge, which is surrounded by a perimetrical surface that is inclined to the land at an angle α. A pressure controller maintains a positive overpressure on liquid to be printed such that a cap of liquid is substantially always present covering the orifice and the land. The edge between the land and the perimetrical surface prevents liquid from overflowing, and maintains the cap, if the pressure is maintained between lower and upper limits disclosed. The liquid to be printed preferably wets the orifice land, which may be alumina, glass, ceramic, and others. Liquids with very small, even zero, wetting angles relative to the land may be used, such as water and organic solvents, including, isopropyl and ethyl alcohol and chloroform. The liquid can be loaded with dissolved polymers, or particles, such as of polymer or ceramic. Very small drops can be printed, by using an orifice of about 40 microns effective diameter, with a land of about 90 microns effective diameter. The printer can be used for any drop dispensing application, such as ink jet, Three Dimensional printing, and also for depositing small amounts of pharmaceutical materials into a receptacle, or drug delivery vehicle. A means for establishing a temperature differential, with a higher upstream and lower downstream temperature, eliminates any gas bubbles at the orifice.

대표
청구항
▼

The invention claimed is: 1. A method for printing drops of liquid, the method comprising the steps of: a. providing a quantity of liquid to be printed; b. providing a nozzle, the nozzle defining an orifice that is aligned along an axis, and having an annular land surrounding the orifice, the land being bounded perimetrically by an outer edge; c. coupling the quantity of liquid hydraulically to the orifice; d. filling the orifice with some of the quantity of liquid; e. establishing within the liquid in the orifice, a steady state pressure that is greater than atmospheric by an overpressure, great enough to cause a cap of liquid to cover the annular land and the orifice; f. selectively causing a single drop of liquid to detach from the cap of liquid and to be ejected from the orifice; and g. allowing pressure at the orifice to return to the steady state pressure, such that a cap of liquid covers the annular land and the orifice. 2. The method of claim 1, the land being a circular annulus, having an outer radius of Rland. 3. The method of claim 2, the step of establishing a steady state pressure comprising the step of establishing a pressure that is: a. not so great as to cause the liquid to wet beyond the outer edge; and b. not so great as to cause the liquid to form a cap having an outer surface that is larger than a hemisphere having a radius equal to Rland. 4. The method of claim 2, the liquid having a surface tension σ and a wetting angle ω with respect to the surface material, the step of providing an overpressure comprising the step of providing a pressure that is greater than 5. The method of claim 4, the step of providing an overpressure comprising the step of providing a pressure that is less than 6. The method of claim 1, the step of providing a quantity of liquid comprising providing a quantity of liquid in a reservoir, the step of hydraulically coupling the quantity of liquid comprising coupling the reservoir to the orifice through a conduit. 7. The method of claim 1, the step of providing a nozzle comprising providing a nozzle having a land comprising a material that is wetted by the liquid. 8. The method of claim 1, the step of providing a nozzle comprising providing a nozzle that further comprises a perimetrical surface that perimetrically bounds the outer edge, the perimetrical surface being inclined relative to the land by an edge angle α> 180째. 9. The method of claim 8, the step of providing a nozzle comprising providing a nozzle with a perimetrical surface inclined relative to the land by an edge angle α of greater than about 210째 and less than about 315째. 10. The method of claim 8, the step of providing a nozzle comprising providing a nozzle with a perimetrical surface inclined relative to the land by an edge angle α of greater than about 225째 and less than about 270째. 11. The method of claim 8, the liquid cap having a surface that defines at its perimeter, a contact angle γ with the land, and the liquid on the orifice land material having a wetting angle, ω, the step of establishing a steady state pressure comprising the step of establishing an over pressure that maintains the cap of a configuration that maintains the angle γ to be less than ω+α-180째. 12. The method of claim 8, the liquid on the orifice land material having a wetting angle ω, the step of providing an overpressure comprising the steps of providing a pressure that is less than 13. The method of claim 1, the liquid having a wetting angle with respect to the material of the orifice land that is less than about 50째. 14. The method of claim 1, the liquid comprising an organic solvent. 15. The method of claim 1, the liquid comprising an alcohol based material. 16. The method of claim 15, the liquid comprising an ethyl alcohol based material. 17. The method of claim 15, the liquid comprising an isopropyl alcohol based material. 18. The method of claim 1, the liquid comprising a chloroform based material. 19. The method of claim 1, the land material comprising glass. 20. The method of claim 1, the land material comprising a ceramic. 21. The method of claim 1, the land comprising alumina. 22. The method of claim 1, the liquid comprising a liquid vehicle that is loaded with a material selected from the group consisting of: dissolved polymer; polymer particles; and ceramic particles. 23. The method of claim 1, the step of establishing an overpressure comprising the step of providing a reservoir of the liquid, hydraulically coupled to and gravitationally above the orifice, and maintaining a surface of the reservoir of the liquid a controlled distance above the orifice, to establish the overpressure. 24. The method of claim 23, further comprising the step of coordinating movement of the reservoir to coincide with any motion of the orifice, so that the middle of the reservoir always remains substantially directly above the orifice. 25. The method of claim 23, the step of maintaining the surface a controlled distance above the orifice comprising measuring the surface location, and replenishing liquid when necessary to maintain the surface within an established tolerance from the controlled distance. 26. The method of claim 1, further comprising the steps of: a. providing a piezoelectric actuator, acoustically coupled to the liquid in the orifice through a conduit; b. the step of selectively causing a single droplet of liquid to be ejected from the orifice comprising the step of energizing the actuator to change its shape and the shape of the conduit sufficiently to initiate in the liquid a pressure wave that travels to the orifice to cause a single droplet of liquid to be ejected from the orifice. 27. The method of claim 26, further comprising the step of providing the quantity of liquid at a temperature of between about 쩍 and about 10 degrees C. more than a temperature at which any liquid at the piezoelectric actuator is maintained. 28. The method of claim 27, the step of providing the quantity of liquid at a temperature that is more than the temperature of any liquid at the piezoelectric actuator comprising the step of heating the quantity of liquid. 29. The method of claim 27, the step of providing the quantity of liquid at a temperature that is more than the temperature of the liquid at the piezoelectric actuator comprising the step of cooling the liquid by when it reaches the piezoelectric actuator. 30. The method of claim 26, further comprising the step of providing the quantity of liquid at a temperature greater than that of any the liquid at the actuator by an amount that is sufficient to decrease the capacity of the warmer liquid to absorb atmospheric gas, relative to the absorption capacity of any the liquid at the actuator by an amount sufficient to substantially eliminate any gas bubbles in any the liquid at the actuator. 31. The method of claim 1, further comprising the steps of: a. providing an evaporative heater, thermally coupled to the liquid; b. the step of selectively causing a single droplet of liquid to be ejected from the orifice comprising the step of energizing the heater to heat sufficiently to cause a single droplet of liquid to be ejected from the orifice. 32. The method of claim 1, further comprising the step of, during times the nozzle is parked, ejecting a droplet of liquid at a relatively low frequency, as compared to a printing frequency. 33. The method of claim 1, the step of establishing a steady state pressure comprising the step of establishing a steady state pressure that is great enough to cause a cap of liquid to cover the land and orifice when the nozzle is quiescent. 34. The method of claim 1, the step of establishing a steady state pressure comprising the step of establishing a stead state pressure that is great enough to cause a cap of liquid to cover the land and orifice when the nozzle is static.

이 특허에 인용된 특허 (53)

이 특허를 인용한 특허 피인용횟수: 9

IPC 상위 출원인

내보내기

상세정보
내보내기 구분	파일저장 인쇄 메일전송
구성항목	관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표IPC 관리번호, 국가코드, 자료구분, 상태, 출원번호, 출원일자, 공개번호, 공개일자, 공고번호, 공고일자, 등록번호, 등록일자, 발명명칭(한글), 발명명칭(영문), 출원인(한글), 출원인(영문), 출원인코드, 대표출원인, 출원인국적, 출원인주소, 발명자, 발명자E, 발명자코드, 발명자주소, 발명자 우편번호, 발명자국적, 대표IPC, IPC코드, 요약, 미국특허분류, 대리인주소, 대리인코드, 대리인(한글), 대리인(영문), 국제공개일자, 국제공개번호, 국제출원일자, 국제출원번호, 우선권, 우선권주장일, 우선권국가, 우선권출원번호, 원출원일자, 원출원번호, 지정국, Citing Patents, Cited Patents
저장형식	Text(ASCII format) Excel format PIAS분석(.xls)
메일정보	받는사람 (필수) @ 보내는사람 (선택) @ 제목 내용 KISTI 검색결과 이메일 서비스
안내	> 총 건의 자료가 검색되었습니다. > 다운받으실 자료의 인덱스를 입력하세요. (1-10,000) > 검색결과의 순서대로 최대 10,000건 까지 다운로드가 가능합니다. > 데이타가 많을 경우 속도가 느려질 수 있습니다.(최대 2~3분 소요) > 다운로드 파일은 UTF-8 형태로 저장됩니다. 파일의 내용이 제대로 보이지 않을실 때는 웹브라우저 상단의 보기 -> 인코딩 -> 자동선택 여부를 확인하십시오 > ~ > Text(ASCII format) Excel format

과학기술 지식인프라 ScienceON

ScienceON Chatbot

연합인증

특허 상세정보

Positive pressure drop-on-demand printing

초록
▼

대표
청구항
▼

이 특허에 인용된 특허 (53)

이 특허를 인용한 특허 피인용횟수: 9

IPC 상위 출원인

과제정보

상세정보조회

원문조회

IPC 상세정보(version : 201201)

연구과제 성과물(0)

참여연구원의 다른 문헌(0)

처리중입니다.

잠시만 기다려주세요.

ScienceON Chatbot

연합인증

특허 상세정보

Positive pressure drop-on-demand printing

초록 ▼

대표청구항 ▼

이 특허에 인용된 특허 (53)

이 특허를 인용한 특허 피인용횟수: 9

IPC 상위 출원인

과제정보

상세정보조회

원문조회

IPC 상세정보(version : 201201)

연구과제 성과물(0)

참여연구원의 다른 문헌(0)

처리중입니다.

잠시만 기다려주세요.

초록
▼

대표
청구항
▼