Sony Group Assigned Three Patents

Servo writer and cartridge
Sony Group Corporation, Tokyo, Japan, has been assigned a patent (12198739) developed by Morita; Hiroshi, Tokyo, Japan, for “servo writer and cartridge.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A servo writer includes a running unit that sends a tape-like magnetic recording medium out from a cartridge, winds up the sent out magnetic recording medium, and runs the magnetic recording medium; an erasing unit that erases a first servo pattern formed in the magnetic recording medium that runs; a head that writes a servo signal in the running magnetic recording medium from which the first servo pattern is erased and forms a second servo pattern; and a control unit that controls the head so that the servo signal is written in at least one period of an accelerated running period and a decelerated running period of the magnetic recording medium, and forms the second servo pattern that does not satisfy a standard in the magnetic recording medium.”

The patent application was filed on 2020-11-10 (17/775667).

Magnetic recording medium having controlled change in average width and cartridge
Sony Group Corporation, Tokyo, Japan, has been assigned a patent (12198743) developed by Yamaga; Minoru, and Takayama; Takahiro, Tokyo, Japan, for “magnetic recording medium having controlled change in average width and cartridge.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “Provided is a magnetic recording medium with a tape shape capable of correcting a change in width of the magnetic recording medium by adjusting a running tension of the magnetic recording medium in a case where the magnetic recording medium is saved or caused to run in a high-temperature environment. The magnetic recording medium is a magnetic recording medium with a tape shape, an amount of change in average width of the magnetic recording medium before and after the magnetic recording medium is left still for 40 hours in an environment at a temperature of 50° C. and a relative humidity of 40% RH in a state where a tension of 0.55 N is applied in a longitudinal direction is 170 ppm or less, and an average tension responsiveness with respect to a tension in the longitudinal direction in the environment at a temperature of 50° C. and a relative humidity of 40% RH is 700 ppm/N or more.”

The patent application was filed on 2022-03-31 (18/284405).

Magnetic recording medium
Sony Group Corporation, Tokyo, Japan, has been assigned a patent (12087340) developed by Ichise; Natsuki, Yamaga; Minoru, Maeshima; Katsunori, Terakawa; Masaru, Takahashi; Takeshi, Sato; Tomoe, and Kataguchi; Takashi, Tokyo, Japan, for a “magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic recording medium is a tape-shaped magnetic recording medium that has a recording layer including an ε-iron oxide particle. An area ratio R.sub.low (=(S.sub.low/S.sub.total)×100) of a total area S.sub.total of an SFD curve of the recording layer in a perpendicular direction and an area S.sub.low of the SFD curve in which a coercivity Hc is in a range from −500 [Oe]≤Hc≤500 [Oe] is equal to or less than 5.5%.”

The patent application was filed on 2020-09-04 (17/760555).