Patent Number: 8,718,502

Title: Fixing device and image forming apparatus incorporating same having a tube which penetrates through a heater and passes infrared rays to a temperature detector

Abstract: A fixing device includes a fixing rotary body rotatable in a predetermined direction of rotation to radiate infrared rays; a pressing rotary body, rotatable in a direction counter to the direction of rotation of the fixing rotary body, pressed against the fixing rotary body to form a fixing nip therebetween through which a recording medium bearing a toner image is conveyed; a heater disposed opposite the fixing rotary body to heat the fixing rotary body; a temperature detector spaced apart from the fixing rotary body to detect a temperature of the fixing rotary body based on the infrared rays from the fixing rotary body and disposed below the fixing nip in a vertical direction; and a tube disposed between the fixing rotary body and the temperature detector, the tube through which the infrared rays from the fixing rotary body enter the temperature detector.

Inventors: Yuasa; Shuutaroh (Kanagawa, JP), Ehara; Masanao (Kanagawa, JP), Ogawa; Tadashi (Tokyo, JP), Ueno; Satoshi (Tokyo, JP), Seo; Hiroshi (Kanagawa, JP), Kawata; Teppei (Kanagawa, JP), Tamaki; Shuntaroh (Kanagawa, JP), Hase; Takamasa (Tokyo, JP), Saito; Kazuya (Kanagawa, JP), Yamaji; Kensuke (Kanagawa, JP)

Assignee: Ricoh Company, Ltd.

International Classification: G03G 15/20 (20060101)

Expiration Date: 5/06/12018