Heating mechanism for use in image forming apparatus
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorsSatoshi Kinouchi, Osamu Takagi
Life of this patent
Estimating the term…
Abstract
Disclosed is a fixing apparatus in which a cylindrical roller having a thin metal layer is heated by an induction heating. In order to shorten the rising time required for elevating the temperature from the stopped state to a predetermined temperature in fixing a toner image transferred onto a paper sheet to the paper sheet, a coil covering member is arranged within the heating roller between an exciting coil and the inner wall of the heating roller, the coil covering member being colored in a color effective for reflecting the infrared ray radiated from the heating roller toward the heating roller. The coil covering member is formed of a material exhibiting electrical insulating properties and heat insulating properties and having a small heat capacity.
Claims18
A fixing apparatus, comprising:
- a first hollow cylindrical roller rotatable in an optional direction;
- a second roller brought into contact with a nip portion on the outer circumferential surface of said first hollow cylindrical roller with a predetermined contact pressure so as to be rotated in accordance with rotation of the first hollow cylindrical roller, the nip portion into which a transferred material is supplied;
- an induction heating apparatus arranged within the first hollow cylindrical roller so as to impart a magnetic flux to the first hollow cylindrical roller and, thus, to generate an eddy current within the first roller, thereby generating heat;
- and
- a covering member having a predetermined color effective for reflecting an infrared ray radiated from the first hollow cylindrical roller and arranged between the first hollow cylindrical roller and said induction heating apparatus so as to prevent the first hollow cylindrical roller from being brought into direct contact with the induction heating apparatus, wherein a moving amount and moving direction of said covering member are limited by a core member for supporting a coil member of said induction heating apparatus.
A fixing apparatus, comprising:
- a first hollow cylindrical roller rotatable in an optional direction;
- a second roller brought into contact with a nip portion on the outer circumferential surface of said first hollow cylindrical roller with a predetermined contact pressure so as to be rotated in accordance with rotation of the first hollow cylindrical roller, the nip portion into which a transferred material is supplied;
- an induction heating apparatus arranged within the first hollow cylindrical roller so as to impart a magnetic flux to the first hollow cylindrical roller and, thus, to generate an eddy current within the first roller, thereby generating heat;
- and
- a covering member having a predetermined color effective for reflecting an infrared ray radiated from the first hollow cylindrical roller and arranged between the first hollow cylindrical roller and said induction heating apparatus so as to prevent the first hollow cylindrical roller from being brought into direct contact with the induction heating apparatus, wherein said covering member has a thickness of at least 0.1 mm.
A fixing apparatus, comprising:
- a first hollow cylindrical roller rotatable in an optional direction;
- a second roller brought into contact with a nip portion on the outer circumferential surface of said first hollow cylindrical roller with a predetermined contact pressure so as to be rotated in accordance with rotation of the first hollow cylindrical roller, the nip portion into which a transferred material is supplied;
- an induction heating apparatus arranged within the first hollow cylindrical roller so as to impart a magnetic flux to the first hollow cylindrical roller and, thus, to generate an eddy current within the first hollow cylindrical roller, thereby generating heat;
- a first covering member having a predetermined color effective for reflecting an infrared ray and arranged in the free space between the first hollow cylindrical roller and said induction heating apparatus so as to prevent the first hollow cylindrical roller from being brought into direct contact with the induction heating apparatus;
- and
- a second covering member having a predetermined color effective for reflecting an infrared ray and arranged in the free space between the first covering member and the induction heating apparatus so as to prevent the first hollow cylindrical roller from being brought into direct contact with the induction heating apparatus, wherein at least one of said first covering member and said second covering member is formed of a thermally shrinkable resin.
A fixing apparatus for use in an electrophotographic apparatus, in which an AC current is supplied to an electromagnetic induction coil arranged in close proximity to an endless member having a metal layer formed of a conductor so as to generate heat in said endless member for heating a transferred material to which a toner image is fixed, comprising:
- a coil member supporting member for supporting the electromagnetic induction coil;
- and
- an adhesive layer for fixing a coil member to said coil member supporting member, wherein said adhesive layer contains titanium oxide to color the adhesive layer white.
Dependencies are inferred from the claim text.