Japan Display Inc.

Nippon Steel Sumitomo Metal Corporation

Kureha Corporation

Junya Yamamoto

Masafumi Miyazaki

Masayuki Hashimura

Kazuyuki Suzuki

Yoshikichi Teramoto

Kazumi Mizukami

Naotsugu Yoshida

Kenichiro Miyamoto

Hideki Kitamura

Yuki Namekata

Mayumi Sugahara

An area light source apparatus includes a first light source and a second light source. Each of the first light source and the second light source is a three-wavelength light-emitting diode. The first light source includes first spectral characteristics including a first peak value at a blue peak wavelength, a second peak value at a green peak wavelength, and a third peak value at a red peak wavelength. The second light source includes second spectral characteristics including a fourth peak value at a blue peak wavelength, a fifth peak value at a green peak wavelength, and a sixth peak value at a red peak wavelength. The second peak value is substantially equal to the fifth peak value, and the third peak value is substantially equal to the sixth peak value.

Area light source apparatus and liquid crystal display device

A spring steel according to the present embodiment has a chemical composition consisting of, in mass %, C: 0.4 to 0.7%, Si: 1.1 to 3.0%, Mn: 0.3 to 1.5%, P: 0.03% or less, S: 0.05% or less, Al: 0.01 to 0.05%, rare earth metal: 0.0001 to 0.002%, N: 0.015%, O or less: 0.0030% or less, Ti: 0.02 to 0.1%, with the balance being Fe and impurities. In the spring steel, the number of oxide inclusions having an equivalent circular diameter of equal to or greater than 5 &#x3bc;m is equal to or less than 0.2/mm, the oxide inclusions each being one of an Al-based oxide, a complex oxide containing REM, O and Al, and a complex oxysulfide containing REM, O, S, and Al. Further, a maximum value among equivalent circular diameters of the oxide inclusions is equal to or less than 40 &#x3bc;m.

Spring steel and method for producing the same

Growing community of inventors

Tokyo, Japan

Junya Yamamoto