Image forming apparatus and fixing device therefor

In a fixing device comprising a hollow cylindrical member to be heated that accommodates a radiation heat source, a temperature of said member to be heated rises to a set temperature in 10 seconds or less while a color temperature of said radiation heat source is 2,500 K or above in a steady state, and

• wherein the hollow cylindrical member is formed of metal and has a wall thickness of 0.8 mm or below, and the radiation heat source is filled with a gas whose major component is lower in heat conductivity than argon, whereby the color temperature of 2,500 K or above is achieved.

In a fixing device comprising a hollow cylindrical member to be heated that accommodates a radiation heat source, a temperature of said member to be heated rises to a set temperature in 10 seconds or less, a rated voltage of 120 V or below is applied to said radiation heat source, and a color temperature of said radiation heat source is 2,500 K or above in a steady state, and

• wherein the hollow cylindrical member is formed of metal and has a wall thickness of 0.8 mm or below, and the radiation heat source is filled with a gas whose major component is lower in heat conductivity than argon, whereby the color temperature of 2,500 K or above is achieved.

In a fixing device comprising a hollow cylindrical member to be heated that accommodates a radiation heat source, there holds a relation:

• ρ×C×V×ΔT/P<10
• wherein ρ denotes a density (kg/m3) of said member to be heated, C denotes specific heat (J/kg/K) of said member, V denotes a volume (m3) of said member, ΔT denotes a difference in temperature elevation of said member to a set temperature, and P denotes power input to said radiation heat source, and a color temperature of said radiation heat source is 2,500 K or above in a steady state, and
• wherein the hollow cylindrical member is formed of metal and has a wall thickness of 0.8 mm or below, and the radiation heat source is filled with a gas whose major component is lower in heat conductivity than argon, whereby the color temperature of 2,500 K or above is achieved.

In an image forming apparatus including a fixing device comprising a hollow cylindrical member to be heated that accommodates a radiation heat source, a temperature of said member to be heated rises to a set temperature in 10 seconds or less while a color temperature of said radiation heat source is 2,500 K or above in a steady state, and

• wherein the hollow cylindrical member is formed of metal and has a wall thickness of 0.8 mm or below, and the radiation heat source is filled with a gas whose major component is lower in heat conductivity than argon, whereby the color temperature of 2,500 K or above is achieved.

In an image forming apparatus including a fixing device comprising a hollow cylindrical member to be heated that accommodates a radiation heat source, a temperature of said member to be heated rises to a set temperature in 10 seconds or less, a rated voltage of 120 V or below is applied to said radiation heat source, and a color temperature of said radiation heat source is 2,500 K or above in a steady state, and

• wherein the hollow cylindrical member is formed of metal and has a wall thickness of 0.8 mm or below, and the radiation heat source is filled with a gas whose major component is lower in heat conductivity than argon, whereby the color temperature of 2,500 K or above is achieved.

In an image forming apparatus including a fixing device comprising a hollow cylindrical member to be heated that accommodates a radiation heat source, there holds a relation:

• ρ×C×V×ΔT/P<10
• wherein ρ denotes a density (kg/m3) of said member to be heated, C denotes specific heat (J/kg/K) of said member, V denotes a volume (m3) of said member, ΔT denotes a difference in temperature elevation of said member to a set temperature, and P denotes power input to said radiation heat source, and a color temperature of said radiation heat source is 2,500 K or above in a steady state, and
• wherein the hollow cylindrical member is formed of metal and has a wall thickness of 0.8 mm or below, and the radiation heat source is filled with a gas whose major component is lower in heat conductivity than argon, whereby the color temperature of 2,500 K or above is achieved.

In a fixing device comprising a member to be heated that accommodates a radiation heat source, said radiation heat source comprises a glass tube accommodating a filament and filled with at least inactive gas whose major component is lower in heat conductivity than argon, the member including a hollow cylindrical member having a wall thickness of 0.8 mm or below.

In a fixing device comprising a member to be heated that accommodates a radiation heat source, said radiation heat source comprises a glass tube accommodating a filament and filled with at least inactive gas whose major component is higher in molecular weight than argon, the member including a hollow cylindrical member having a wall thickness of 0.8 mm or below.

In an image forming apparatus including a fixing device comprising a member to be heated that accommodates a radiation heat source, said radiation heat source comprises a glass tube accommodating a filament and filled with at least inactive gas whose major component is lower in heat conductivity than argon, the member including a hollow cylindrical member having a wall thickness of 0.8 mm or below.

In an image forming apparatus including a fixing device comprising a member to be heated that accommodates a radiation heat source, said radiation heat source comprises a glass tube accommodating a filament and filled with at least inactive gas whose major component is higher in molecular weight than argon, the member including a hollow cylindrical member having a wall thickness of 0.8 mm or below.

A heating device for a fixing device, comprising:

• a halogen heater comprising a glass tube filled with an inactive gas whose major component is either one of xenon and krypton and a halogen substance;
• and
• a hollow cylindrical member accommodating said halogen heater and having a wall thickness of 0.8 mm or below.