baber/WOPTO huggingface dataset:
Patent KR-20160119292-A (KR)
Title: 원레이어 기판 및 이의 제조 방법, 원레이어 기판를 이용한 반도체 패키지
Inventor: JEON HYUNG IL
IPC: H01L23/31
Filed: 2015-04-02
Abstract: 솔더볼과 같은 입출력단자의 용이한 부착을 위하여 실버레이어를 채택한 반도체 패키지 제조용 원레이어 기판 및 이의 제조 방법, 그리고 제조된 원레이어 기판를 이용한 반도체 패키지에 관한 것이다. 
즉, 본 발명은 소정의 간격으로 배열되는 복수의 구리필러와; 상기 구리필러의 일면에 적층 부착되는 실버레이어와; 상기 구리필러 및 실버레이어를 감싸면서 프리몰딩되되, 실버레이어의 외면이 노출되도록 프리몰딩되는 절연성의 프리몰딩체; 를 포함하여 구성된 원레이어 기판 및 이의 제조 방법, 그리고 제조된 원레이어 기판를 이용한 반도체 패키지를 제공하고자 한 것이다.
Patent KR-20150043276-A (KR)
IPC: B22F9/04
Filed: 2015-04-06
Abstract: The present invention relates to a method to produce an ultra-light alloy containing a carbon nanotube and, more specifically, relates to a method to produce an ultra-light alloy including a carbon nanotube including: (a) a step of forming a carbon nanotube-metal composite using the carbon nanotube and a metal powder; (b) a step of mixing the carbon nanotube-metal composite obtained through the step (a) with a light powder; (c) a step of molding the mixed powder obtained through step (b); and (d) a step of sintering a molded body obtained through the step (c). The present invention is capable of producing the ultra-light alloy having excellent hardness and toughness by minimizing a reaction between the carbon nanotube contained in the ultra-light alloy and transition metal carbide to maximize an effect of increasing the toughness caused by adding the carbon nanotube. The ultra-light alloy including the carbon nanotube produced by the method obtains high hardness and high toughness; thereby being utilized for a cutting tool, a mold, an abrasion resistance material, and a heat resistant material.
Patent KR-20160065726-A (KR)
Inventor: CHO CHUN RAE
IPC: H04W4/12
Filed: 2015-04-07
Abstract: According to an embodiment of the present invention, disclosed is a nursing service providing method which comprises the following steps of: receiving result information with respect to a nursing service provided to a patient from a first medical care provider terminal; extracting preset rule information with respect to the nursing service; determining whether the received result information corresponds to the extracted rule information; and transmitting the received result information to a second medical care provider terminal if the received result information corresponds to the rule information. Therefore, the method enables a medical care provider to monitor the condition of a patient in real time.
Patent KR-20160120935-A (KR)
Title: 메모리, 방사능 환경에서 메모리의 동작 방법, 전력제어 장치 및 전력제어 방법
Inventor: CHANG IK JOON
IPC: G11C5/14
Filed: 2015-04-09
Abstract: 본 발명은 대기 모드에서 동작하는 메모리의 각 노드별로 비트 에러 레이트(BER, bit error rate)를 획득하는 제1 획득부, 상기 비트 에러 레이트를 참조하여 상기 메모리의 각 노드에 대한 최적화된 스크러빙 레이트(scrubbing rate)를 획득하는 제2 획득부 및 상기 최적화된 스크러빙 레이트에 대응하는 스크러빙 전력과 누설 전류에 대응하는 누설 전력이 포함된 대기 전력의 최소값을 적응적으로 결정하여 상기 메모리의 각 노드를 제어하는 제어부를 포함하는 방사능 환경에서 메모리, 메모리의 동작 방법, 전력제어 장치 및 전력제어 방법을 개시한다.
Patent KR-20160122357-A (KR)
Inventor: KIM SUN KOOK
IPC: H01H71/62
Filed: 2015-04-13
Abstract: The present invention provides an external handle locking unit of a circuit breaker for wiring, which comprises: a base frame installed in a door of a distribution board; a handle body installed in the base frame, and rotated to turn on and off a circuit breaker installed in the distribution board; and a locking unit interworked with a rotation operation of the handle body, and linearly moved to lock and unlock the door.
Patent KR-20160124972-A (KR)
Inventor: CHO KYU YONG
IPC: C04B24/12
Filed: 2015-04-20
Abstract: The present invention relates to an admixture composition for autoclave-cured concrete containing 25 to 75 parts by weight of general Portland cement, 10 to 30 parts by weight of activated silica, and 10 to 60 parts by weight of crystalline slag and formed by mixing 0.01 to 0.04 wt% of an amine compound having end group triol as a selection promoter with respect to the weight of the crystalline slag. According to the present invention, the crystalline slag, which is discharged as an industrial byproduct, is used for concrete manufacturing with its reactivity improved by the use of the selection promoter, and thus cement consumption can be reduced. In addition, the active use of the crystalline slag as an industrial byproduct results in a reduction of environmental pollution problems and manufacturing costs.
Patent KR-20160061853-A (KR)
Inventor: KIM BYUNG JUN
IPC: A61K8/19
Filed: 2015-04-21
Abstract: The present invention relates to a powder type toothpaste composition containing bamboo-salt and dipotassium glycyrrhizinate. The present invention relates to a powder type toothpaste composition having a cold teeth alleviating effect and, more specifically, to a powder type toothpaste composition which has prevention or alleviation effects of a cold teeth symptom, and does not generate teeth abrasion while having cleaning ability by comprising both the bamboo-salt and the dipotassium glycyrrhizinate.
Patent KR-20160035537-A (KR)
Inventor: HONG JUN KI
IPC: A61K8/06
Filed: 2015-04-23
Abstract: The present invention relates to a cosmetic product in the form that a cosmetic composition is absorbed into cotton and, more specifically, to a cosmetic product in the form that an emulsion, liquid, solid and powder type cosmetic composition is absorbed into cotton, after commonly filling cotton in any container without regard to the shape of a container. According to the present invention, the cosmetic product can be used for common use in any container since the shape of a container is irrelevant and the cotton can be transformed, when filling a cosmetic container with cotton. The cosmetic product in which the cosmetic composition is absorbed into cotton has improved stability by support effects of cotton, is not affected by formulation and stably protected, thereby being able to develop cosmetic compositions of various formulations and various feelings of use. Moreover, as the present invention helps the cosmetic product to be used without limitation of containers, the container can be used regardless of formulation, thereby lowering the manufacturing cost of cosmetic products.
Patent KR-20160128035-A (KR)
Title: Hologram stage setting
Inventor: LEE KWAN JOON
IPC: G03H1/22
Filed: 2015-04-28
Abstract: The purpose of the present invention is to provide a hologram stage setting device capable of performing a performance without a special restriction in a normal stage which is not a specifically prepared stage, solving a high cost problem by using an existing foil screen, realizing a high resolution image, reinforcing durability, and performing simple maintenance by applying a net screen having a grid pattern net structure coated by a ceramic ball lens to the front of the stage and by directly projecting the image through a direct method. The hologram stage setting device comprises: a rear screen to display a rear background image by being installed at a rear stage; a lower screen to display a lower background image by being installed at a lower stage; a front screen to display a front hologram image by being installed at a front stage; and a projector for a front hologram image to project the front hologram image by generating the front hologram image.
Patent KR-20160132286-A (KR)
Inventor: JUNG HYUNG GI
IPC: H01L51/00
Filed: 2015-05-08
Abstract: A curved display device according to an embodiment of the present invention, as a curved display device which includes an upper plate and a lower plate coupled to the lower side of the upper plate, includes a first stress reduction layer which is deposited on a lower side of at least one of the upper plate and the lower plate and generates a force so as to be convex downward. So, the curved display device can reduce the generation of a stress while being completely manufactured.
Patent KR-20160138619-A (KR)
Inventor: LEE HYUN KU
IPC: G01M13/02
Filed: 2015-05-26
Abstract: The present invention relates to a gear transmission error measuring device which can easily and precisely measure a gear transmission error regarding a gear transmission mechanism (a gear train or a gear box) used in a transmission or the like. The gear transmission error measuring device according to the present invention includes: a measuring jig rotationally supporting a rotary shaft of the gear transmission mechanism; an encoder installed on the rotary shaft of the gear transmission mechanism and measuring a rotating speed of the rotary shaft; and a transmission error calculator connected to the encoder to calculate a transmission error of a gear set.
Patent KR-20160139879-A (KR)
Inventor: KIM YEON JOON
IPC: H01L21/02
Filed: 2015-05-29
Abstract: A chemical liquid circulating apparatus includes a chemical liquid supply part configured to supply chemical liquid to an ink jet head where nozzles for discharging the chemical liquid to a substrate by an inkjet method are disposed; a chemical liquid collection part arranged to collect the chemical liquid supplied from the chemical liquid supply part to the ink jet head; and a chemical solution transfer part configured to transfer the chemical solution collected in the chemical solution collection part to the chemical solution supply part. So, the solidification of the chemical liquid can be prevented.
Patent KR-20160144174-A (KR)
Inventor: YUH SANG KOOK
IPC: G10K11/16
Filed: 2015-06-08
Abstract: The present invention provides a white noise output system for applying pleasant white noise listening environment and a white noise output method. According to an aspect of the present invention, the white noise output system includes: an audio signal generation unit (110) generating and outputting a reference sound signal of a sine wave form by each frequency in an audibility area; a white noise generation unit (120) outputting a white noise signal; an amplifier (130) receiving the white noise signal outputted by the white noise generation unit (120) and the each reference sound signal outputted by the audio signal generation unit (110) and amplifying the white noise signal and the reference sound signal in a level capable of outputting the amplifying the white noise signal and the reference sound signal; a speaker (140) outputting the reference sound signal and the white noise signal, amplified by the amplifier (130) as sound; and an equalizer (150) controlling an output level of the each reference sound signal in accordance with an input signal of a control unit (160) and outputting the white noise signal to the amplifier (130) by changing the output size of the each frequency which the white noise signal outputted from the noise signal generation unit (120) has in accordance with a setting value of the output level controlled.
Patent KR-20160147576-A (KR)
Title: Light Emitting Device Package
Inventor: KIM KI HYUN
IPC: H01L33/60
Filed: 2015-06-15
Abstract: The present invention relates to a light emitting device package. The light emitting device package includes: a base having a securing surface; a light emitting device arranged on the securing surface; a lens arranged on the securing surface to cover the light emitting device; and a reflection unit arranged to be spaced apart from the lens on the securing surface and formed at a preset inclined angle (). The preset inclined angle () can be set by separation distance between the lens and the reflection unit. Thereby, the light emitting device package includes a reflection unit formed at the preset inclined angle in accordance with the separation distance between the lens and the reflection unit, thereby minimizing variation of a beam angle and a field angle.
Patent KR-20170002001-A (KR)
Title: Fixed multi-tap
Inventor: NA GYEONG MAN
IPC: H01R13/66
Filed: 2015-06-29
Abstract: According to an embodiment of the present invention, a fixed multi-tap includes: a multi-tap main body having a groove; an outlet formed on the multi-tap main body; a wire connected to the multi-tap main body; and a cord arranged at an end of the wire. The multi-tap main body includes a height controlling unit for controlling the size of the groove.
Patent KR-20170008515-A (KR)
Inventor: CHO SEONG WOO
IPC: A47B85/00
Filed: 2015-07-14
Abstract: 본 발명은 탁자 의자에 관한 것으로써, 더욱 상세하게는 가구에 있어서, 의자 몸체와 탁자 몸체 및 다리위치 조절기로 구성하여서, 탁자와 의자로 따로 이용이 가능하고, 탁자에서 슬라이드 판이 나와 물건을 거치할 수 있다. 또한 의자와 탁자를 결합하여 하나의 탁자로 이용 가능하며, 동시에 의자에 홈을 내고 다리위치 조절이 가능한 탁자를 의자에 끼워 고정해서 키가 높은 탁자로 이용할 수 있도록 함을 목적으로 한 것이다.
Patent KR-20170009477-A (KR)
Title: driving signal control circuit and driving apparatus including a driving signal control circuit
Inventor: KANG MAN KEUN
IPC: G11C7/06
Filed: 2015-07-17
Abstract: According to the present invention, a driving signal control circuit includes: a discharge unit for generating a discharge signal by comparing a core voltage with a reference voltage; a counter unit for generating a count signal by performing an up-down count operation according to the discharge signal; and a driving control unit for generating a driving signal having an activation period proportional to the count signal.
Patent KR-20170012752-A (KR)
Title: Liquid crystal display device and method of manufacturing the same
Inventor: KIM DONG WOOK
IPC: G02F1/1335
Filed: 2015-07-23
Abstract: Disclosed is a liquid crystal display device with a light leakage preventing structure. The liquid crystal display device according to an embodiment of the present invention includes a first substrate and a second substrate which face each other, a liquid crystal layer which is arranged between the first substrate and the second substrate, a column spacer which is arranged on the first substrate and maintains an interval between the first substrate and the second substrate, a light shielding pattern which is arranged on the first substrate and includes an adding part which protrudes from the surroundings of the column spacer, and light shielding metal which overlaps with at least a part of a region adjacent to the outside from a boundary which is not horizontal to an alignment direction of liquid crystal among the boundaries of the adding part.
Patent KR-20170016146-A (KR)
Title: Power supply apparatus and method for controlling converter
Inventor: OH JI YEON
IPC: H02M1/00
Filed: 2015-08-03
Abstract: A power supply apparatus according to an aspect of the present invention includes a converter for converting an input voltage into DC power; a sensing part for sensing the level of the DC power; and a control part for controlling the level of the input voltage based on the level of the DC power. The stability, durability, compatibility, and the like can be ensured.
Patent KR-20170017313-A (KR)
Title: 렌즈밴드가 부착 된 렌즈 캡
Inventor: CHOE YU JEOUNG
IPC: G03B11/04
Filed: 2015-08-06
Abstract: 본 발명은 렌즈 밴드가 부착된 렌즈 캡에 관한 것으로서, 렌즈 보호를 위한 렌즈캡을 카메라 몸체의 손상 없이 용이하게 결속할 수 있도록 함을 목적으로 한 것이다.  
즉 본 발명은 렌즈 캡에 있어서, 렌즈 캡과 연결줄 그리고 그 끝에 구비된 렌즈 밴드로 구성되어있다.  
따라서, 본 발명은 렌즈 캡과 연결줄 그리고 그 끝에 구비된 렌즈 밴드 구성함으로써 사용자가 사진을 촬영할 때 쉽게 분실되는 렌즈 캡에 밴드를 부착함으로렌즈 보호를 위한 렌즈 캡을 카메라 몸체의 손상 없이 용이하게 결속할 수 있는 효과를 같는 것이다.
Patent KR-20170020668-A (KR)
Inventor: LEE WOO JIN
IPC: C08J5/00
Filed: 2015-08-13
Abstract: The present invention relates to a thermoplastic resin composition, comprising: a polycarbonate resin; a rubber-modified aromatic vinyl graft copolymer; an aromatic vinyl-based copolymer resin; a phosphorus-based flame retardant; and an inorganic filler. In the thermoplastic resin composition, the rubber-modified aromatic vinyl graft copolymer comprises a first rubber-modified aromatic vinyl graft copolymer having an average particle diameter (D50) of a rubbery polymer of 100-135 nm and a second rubber-modified aromatic vinyl graft copolymer having an average particle diameter (D50) of a rubbery polymer of 250-400 nm, and the weight ratio of the first rubber-modified aromatic vinyl graft copolymer to the second rubber-modified aromatic vinyl graft copolymer is 1:0.1 to 1:10. The thermoplastic resin composition has excellent anti-fatigue property, impact resistance and flame resistance.
Patent KR-20170023223-A (KR)
Inventor: CHO SUNG JIN
IPC: B24B49/00
Filed: 2015-08-19
Abstract: 패널의 에지 폴리싱 장치 및 방법이 개시된다. 패널의 강성을 강화하기 위해 패널의 에지를 고속으로 회전하는 연마휠로 폴리싱하는 장치로서, 연마 대상 패널을 로딩하는 테이블과, 스핀들 모터를 포함하는 구동부와, 컵휠 형태로 형성되고, 스핀들 모터의 구동축에 결합되며, 고속으로 회전하는 원판면이 패널의 에지에 접촉하여 패널의 에지를 폴리싱하는 연마휠과, 구동부가 x축 및 z축 방향으로 각각 이동하고 c축을 중심으로 회전하도록 구동부를 지지하는 지지부와, 패널의 에지가 곡선 구간일 경우, 연마휠이 에지에 접촉하는 지점에서 에지의 접선이 연마휠의 원판면에 포함되도록 구동부를 c축을 중심으로 회전시키는 제어부를 포함하는 패널의 에지 폴리싱 장치는, 종래에 이형 패널의 연마에 주로 사용해 오던 그루브 휠 타입의 연마휠 대신 컵휠 타입의 연마휠을 사용함으로써, 이형 LCD 또는 글래스 패널의 강성을 효과적으로 강화시킬 수 있다.
Patent KR-20170022011-A (KR)
Title: Negative electrode for magnesium rechargeable batteries, manufacturing method of the same, and magnesium rechargeable batteries including the same
Inventor: WOO SANG GIL
IPC: H01M10/0568
Filed: 2015-08-19
Abstract: The present invention relates to a negative electrode for a magnesium battery of a new concept which is capable of absorbing and releasing magnesium ions, a manufacturing method of the same, and a magnesium battery comprising the same. According to the present invention, the negative electrode for the magnesium battery is capable of absorbing and releasing magnesium ions and effectively reduces or removes the formation of magnesium oxide which is formed on the surface of the negative electrode in a conventional magnesium battery. The magnesium battery comprising the negative electrode which is capable of absorbing and releasing magnesium ions can improve lifespan characteristics and the charge/discharge characteristics.
Patent KR-20170023370-A (KR)
Title: Organic light-emitting device
Inventor: LEE JUNG SUB
IPC: H01L51/00
Filed: 2015-08-21
Abstract: Disclosed are a heterocyclic compound and an organic light-emitting device comprising the same. The organic light-emitting device comprises: a first electrode; a second electrode; and an organic layer including a light-emitting layer and a positive hole transporting region. The light-emitting device has high efficiency and high durability.
Patent KR-20170025966-A (KR)
Inventor: LEE JONG HO
IPC: H04L27/26
Filed: 2015-08-31
Abstract: The present invention relates to an analog self-interference cancellation system in an OFDM-based wireless communication system. The analog self-interference cancellation system includes: a transmitter for generating a transmission signal using a baseband input signal and transmitting the generated transmission signal through wireless communication; a self-interference signal generator for generating a pseudo self-interference signal using the baseband input signal; and a receiver for receiving the transmission signal transmitted from the transmitter through wireless communication and the pseudo self-interference signal from the self-interference signal generator, wherein the receiver removes the self-interference signal included in the transmission signal by using the pseudo self-interference signal to extract a signal from which the self-interference signal included in the transmission signal is removed. The self-interference signal included in the transmission signal received by the receiver is a self-interference signal which is generated by forming the transmission signal as a multi-channel signal when the receiver receives the transmission signal transmitted from the transmitter through wireless communication. Therefore, a baseband self-interference signal estimation and generation unit of a transmitting end adds a delay and a weight to the baseband signal of the transmitting end to estimate the self-interference signal and generate the pseudo self-interference signal, thereby generating the self-interference signal for a multi-path channel without adding adding a hardware configuration.
Patent KR-20170030792-A (KR)
Title: 와이어 커팅장치
Inventor: PARK YOUNG MIN
IPC: B26D1/547
Filed: 2015-09-10
Abstract: 본 발명은 와이어 커팅장치에 관한 것으로서, 외면에 다이아몬드가 코팅된 와이어를 이용하여 석재나 파일 등을 절단하는 와이이 커팅장치가 커팅되는 각도를 용이하게 조절하여 커팅할 수 있도록 하기 위하여 개발된 것으로; 
바닥면에 설치되는 평판형으로 이루어지며 전후 방향으로 연장되는 평행한 2개 이상의 레일과, 전후 방향으로 연장되고 일측면에 기어이가 형성되는 레크가 형성되는 하부베이스와; 
이송모터에 의하여 회전하며 상기 레크와 연동하는 피니언을 구비하고, 정면 상단에서 전방으로 연장되는 수평부과, 상기 수평부의 끝단에서 하부로 연장되면서 분기되어 양측으로 연장되는 수직지지부와, 상기 수직지지부의 양측 하단을 포함하여 상기 레일에 안착되어 회전하는 복수 개의 바퀴를 구비하는 메인몸체와; 
내부에 내장되어 측방향으로 축이 관통하여 회전하는 구동모터와, 상기 구동모터의 축에 장착되어 회전하는 와이어휠과, 상기 와이어휠에 장착되어 피절단물을 절단하는 와이어와, 상기 수직지지부를 관통하여 전방으로 연결되는 회전조절바와, 상기 회전조절바과 동일 축 선상으로 연장되어 상기 메인몸체를 관통하여 장착되는 힌지축을 구비하는 회전몸체를 포함하여 구성됨을 특징으로 하는 와이어 커팅장치에 관한 것이다.
Patent KR-20170031497-A (KR)
Inventor: LEE DO HYUNG
IPC: B24B29/00
Filed: 2015-09-11
Abstract: 본 발명은 광택 장치에 관한 것으로, 반지의 외면 또는 측면에 접촉되어 광택을 내도록 하는 막대 형상의 제1 광택부, 반지의 내면과 접촉되어 반지의 내면에 광택이 형성되도록 중간 영역이 볼록하게 형성되며, 반지의 외면 또는 측면에 형성된 홈과 접촉되도록 볼록한 부분에서 끝단측으로 단면이 작아지도록 형성되며, 뾰족하게 형성된 끝단을 가지는 제2 광택부 및 제1 광택부와 제2 광택부를 연결하며, 반지의 외면과 측면 사이의 모서리 또는 반지의 내면과 측면 사이의 모서리와 접촉하도록 제1 광택부에서 제2 광택부로 진행하는 방향이 경사지게 형성되는 연결부를 포함하는 광택 장치에 관한 것이다.
Patent KR-20170034601-A (KR)
Inventor: KIM YU SANG
IPC: C23C18/32
Filed: 2015-09-21
Abstract: Disclosed is a method for plating a substrate, capable of forming a gold plating layer by selectively depositing gold only on a portion coated with copper without eduction of gold on the surface of a non-conductor such as ceramic which is not coated with copper in a non-conductive substrate such as ceramic. Nickel can readily penetrate between Au atoms, so an Au-Ni-Sn-Pb (gold-nickel-tin-lead) alloy layer can be easily formed during soldering, so that excellent soldering property (adhesion, pulling, strength, etc.) can be achieved. The substrate plating method includes: a substrate preparation step to prepare a non-conductive substrate having a surface of a copper layer coated with copper as well as a surface of a non-conductor on which copper is not coated; a nickel plating step to form a nickel layer by plating the surface of the copper layer with nickel; and an electroless displacement gold plating step to form a gold plating plate by educting gold only on a surface of the nickel layer without educting gold on a surface of the non-conductor which is not coated with copper by immersing the non-conductive substrate formed with the nickel layer in an electroless displacement gold plating solution having no reducing agent.
Patent KR-20170035530-A (KR)
Inventor: LEE YOUNG HAK
IPC: E06C1/393
Filed: 2015-09-23
Abstract: The present invention relates to a foldable step ladder which comprises a folding means which combines a pair of steps which have a step cap on both side surfaces with a hinge to secure sufficient space for a worker to easily go up and down and to easily perform work. The folding means comprises: a work unit including a first hinge piece, whose part is opened and which is formed on a side surface of a step in a longitudinal direction, and a second hinge piece rotatably inserted into the first hinge piece formed on a side surface of the other step which folds the pair of steps; leg units including a pair of struts inserted into the step cap installed to correspond to both side surfaces of the work unit; a stepping unit formed between the leg units including one or more stepping plates on both side surfaces; and a pair of support bars placed on a bottom of the work unit and combined with a part between the leg units with a hinge. The support bars are linked with the leg units and folded to limit a range of rotation of the leg units and to improve workability.
Patent KR-20160038780-A (KR)
Inventor: NEGISHI TOMOAKI
IPC: G02B1/00
Filed: 2015-09-23
Abstract: The present invention relates to glass, a glass material for press molding, an optical element blank, and an optical element. Provided in the present invention is the glass, having a refractive index (nd) in the range of 1.790-1.830 and an Abbe′s number (νd) in the range of 45-48, having excellent thermal stability, and having absorption properties desirable to manufacture a cemented lens. The glass comprises: 20-35 mass% of the sum of SiO_2 and B_2O_3 contents; 50-70 mass% of the sum of La_2O_3, Gd_2O_3, Y_2O_3, and Yb_2O_3 contents; 37-69 mass% of La_2O_3 contents; 0-3 mass% of Gd_2O_3 contents; 3-30 mass% of Y_2O_3 contents; greater than or equal to 0 mass% and less than 2 mass% of Yb_2O_3; 2-15 mass% of ZrO_2 contents; 1-6 mass% of the sum of TiO_2, Nb_2O_5, and Ta_2O_5 contents; 0-4 mass% of ZnO contents; and 0-2 mass% of WO_3 contents.