Fuji Photo Film Company, Limited

Panasonic Corporation

Showa Denko K.k.

Koji Kudo

Shigehisa Shimizu

Hisashi Takahashi

Tatsuharu Arai

Toshio Mori

Satoshi Mino

Hiroyuki Osanai

Ryota Homma

Hiromitu Nojima

A digital amplifier amplifies an input signal from a tuner () which receives a broadcast wave of a set receiving frequency so as to suppress degradation of the high-band reproduction performance and lowering of the amplification efficiency. The digital amplifier includes: a band division unit () for dividing an input signal into a plurality of bands; a high-band pulse width modulation unit () and a low-band pulse width modulation unit () which modulate the input signal of the respective bands divided by the band division unit (), by the pulse width modulation method; a switching frequency control unit () which obtains a receiving frequency in the tuner () and controls a switching frequency (fsa) in the high-band pulse width modulation unit () and a switching frequency (fsb) in the low-band pulse width modulation unit (); and a high-band amplification unit () and a low-band amplification unit () which amplify the input signal which has been subjected to pulse width modulation by the high-band pulse width modulation unit () and the low-band pulse width modulation unit ().

Digital amplifier

A package of rolled photosensitive mateiral comprising a core, a photosensitive strip material wound around the core, a light-shielding leader connected to the end of the photosensitive strip material to shield the peripheral surface of the photosensitive strip material from light and side light-shielding covers connected to both sides of the light-shielding leader so that the boundary between the side light-shielding covers and the light-shielding leader corresponds to the boundary between the peripheral surface and the side surface of the photosensitive strip material. The core is formed by laminating at least 2 sheets of a base paper being moistureproof. The side light-shielding covers are composed of a composite film having a polyethylene film having light-shielding ability and a uniaxially oriented film or a biaxially oriented film made of polyester, polyethylene polypropylene or nylon with the length of the side light-shielding covers being not less than twice as long as the outer periphery of a roll of the photosensitive strip material.

Package of rolled photosensitive material

A process for purifying 2,3-dichloro-1-propanol is disclosed, which comprises introducing a chlorination reaction mixture obtained by chlorination of allyl alcohol in a hydrochloric acid aqueous solution in a reactor, to a degassing tower, where hydrogen chloride is released, returning the hydrogen chloride to the chlorination reactor, cooling the residual liquid to separate into an aqueous layer and an oily layer, and returning the aqueous layer to the chlorination reactor while recovering 2,3-dichloro-1-propanol from the oily layer, wherein said oily layer is introduced to a first distillation tower, where hydrogen chloride, part of the produced 2,3-dichloro-1-propanol, and other low-boiling components are recovered as a distillate, cooling the distillate to separate it into an aqueous layer and an oily layer, returning the aqueous layer of the distillate to the chlorination reactor, and recovering 2,3-dichloro-1-propanol from the oily layer of the distillate and a high-boiling fraction of the first distillation tower. Where 2,3-dichloro-1-propanol is for use as a starting material of epichlorohydrin, the process involves no wasteful consumption of calcium hydroxide.

Purification of 2,3-dichloro-1-propanol

Growing community of inventors

Kanagawa, Japan

Koji Kudo