Apparatus for fixing images

An image forming apparatus comprising:

• image forming means for forming an unfixed image;
• high frequency fixing means for fixing the unfixed image on a recording material, said high frequency fixed means including means for producing high frequency radiation, a solid waveguide member made of a solid dielectric material connected with said producing means extending across a region where the recording material passes, for guiding the high frequency radiation from said producing means, and means for absorbing excess high frequency radiation which passes through said solid waveguide member, wherein said solid dielectric material has on its surface a conductive member forming a surface for concentrating the high frequency radiation to apply to the unfixed image;
• and
• means associated with said fixing means for controlling the temperature of said solid dielectric material, said means extending along substantially the whole length of said solid dielectric material, wherein said temperature controlling means has an auxiliary heating means for absorbing the heat from said solid dielectric material and utilizing it for heating the recording material.

An image forming apparatus comprising:

• image forming means for forming an unfixed image;
• high frequency fixing means for fixing the unfixed image on a recording material, said high frequency fixing means including means for producing high frequency radiation, a solid waveguide member made of a solid dielectric material connected with said producing means extending across a region where the recording material passes, for guiding the high frequency radiation from said producing means, and means for absorbing excess high frequency radiation which passes through said solid waveguide member, wherein said solid dielectric material has on its surface a conductive member forming a surface for concentrating the high frequency radiation to apply to the unfixed image;
• and
• means associated with said fixing means for controlling the temperature of said solid dielectric material, said means extending along substantially the whole length of said solid dielectric material, wherein said temperature controlling means has a thermal absorbing member of thermal conductivity higher than that of said dielectric material.

An image forming apparatus comprising:

• image forming means for forming an unfixed image;
• high frequency fixing means for fixing the unfixed image on a recording material, said high frequency fixing means including means for producing high frequency radiation, a solid waveguide member made of a solid dielectric material connected with said producing means extending across a region where the recording material passes, for guiding the high frequency radiation from said producing means, and means for absorbing excess high frequency radiation which passes through said solid waveguide member, wherein said solid dielectric material has on its surface a conductive member forming a surface for concentrating the high frequency radiation to apply to the unfixed image;
• and
• means associated with said fixing means for controlling the temperature of said solid dielectric material, said means extending along substantially the whole length of said solid dielectric material, wherein said dielectric material is selected from alumina porcelain, steatite porcelain, white mica or ceramics.

An image forming apparatus comprising:

• image forming means for forming an unfixed image;
• high frequency fixing means for fixing the unfixed image on a recording material, said high frequency fixing means including means for producing high frequency radiation, a solid waveguide member made of a solid dielectric material connected with said producing means extending across a region where the recording material passes, for guiding the high frequency radiation from said producing means, and means for absorbing excess high frequency radiation which passes through said solid waveguide member, wherein said solid dielectric material has on its surface a conductive member forming a surface for concentrating the high frequency radiation to apply to the unfixed image;
• and
• means associated with said fixing means for controlling the temperature of said solid dielectric material, said means extending along substantially the whole length of said solid dielectric material, wherein said high frequency radiation is microwave radiation and the unfixed image is formed with a developing agent having a dielectric member which produces heat by dielectric loss due to the microwave radiation.