1. A method for measuring blood oxygen saturation comprising:
emitting light from at least one light source;
detecting a plurality of light spectrums having time-varying components from the light with at least one detector subsequent to the light being scattered by tissue, the plurality of light spectrums including a first light spectrum having a wavelength between 725 and 745 nanometers and a second light spectrum having a wavelength between 880 and 940 nanometers; and
calculating a blood oxygen saturation reading using a pulse oximetry algorithm based on the plurality of detected light spectrums.
2. The method of claim 1, wherein the plurality of light spectrums includes a third light spectrum having a wavelength of approximately 660 nanometers.
3. The method of claim 2, comprising:
detecting the first light spectrum via a first light filter;
detecting the second light spectrum via a second light filter; and
detecting the third light spectrum via a third light filter.
4. The method of claim 3, comprising selecting a pair of light spectrums from the first, second and third light spectrums based on an estimated oxygen saturation for use in calculating the blood oxygen saturation reading.
5. A method for measuring blood oxygen saturation comprising:
emitting a first light, the first light having a wavelength between 725 and 745 nanometers;
emitting a second light, the second light having a wavelength between 880 and 940 nanometers;
detecting the first light with a detector subsequent to the first light being scattered by tissue and interacting with a time-varying blood supply; and
detecting the second light with the detector subsequent to the second light being scattered by the tissue and interacting with a time-varying blood supply; and
calculating a blood oxygen saturation reading using a pulse oximetry algorithm based on the detected first light and the detected second light.
6. The method of claim 5, comprising:
emitting a third light having a wavelength of approximately 660 nanometers; and
detecting the third light with the detector subsequent to the third light being scattered by the tissue and interacting with a time-varying blood supply.
7. The method of claim 6, comprising:
emitting the first light from a first light emitting device;
emitting the second light from a second light emitting device; and
emitting the third light from a third light emitting device.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An image forming apparatus, comprising:
a fixing unit for fixing a toner image formed on a recording material by heat; and
an outer cover attached to the image forming apparatus, including an acoustic insulation member for preventing a sound and a heat conductive member having a coefficient of heat conductance higher than the acoustic insulation member and a surface layer covering the acoustic insulation member.
2. An image forming apparatus according to claim 1, wherein said outer cover has the plurality of heat conductive members, and when a relationship among an area of the projection surface of the fixing unit is taken as A (m2), a total projection area of the plurality of heat conductive members as B (m2), and a coefficient of heat conductance of the heat conductive member as k(Wm\xb7K) satisfy B\u22670.2 Ak.
3. An image forming apparatus according to claim 1, wherein said outer cover is provided on the downstream side in a conveying direction of the recording material of said fixing unit.
4. An image forming apparatus according to claim 1, wherein the heat conductive member penetrates a acoustic absorption member.
5. An image forming apparatus according to claim 1, wherein the heat conductive member is metal.
6. An image forming apparatus according to claim 1, wherein the surface layer is a metal member.
7. An image forming apparatus according to claim 1, wherein the surface layer is a resin member.