Heating apparatus for scan lamp

Claim 2

An illuminating apparatus, including: a substantially elongated tubular tri-phosphor light source having a substantially opaque region extending over a portion of the exterior circumferential surface thereof from about one end portion of said light source to about the other end portion thereof, and a substantially transparent region extending over the remaining portion of the exterior circumferential surface of said light source; heating means entrainEd substantially about the opaque region of the exterior circumferential surface of said light source and arranged to supply energy to said light source, said heating means being an arcuate member arranged to mount slidably on said light source in substantial contact with the opaque region of the exterior circumferential surface thereof, said arcuate member extending in a longitudinal direction from about the region of one end portion of said light source to about the region of the other end portion thereof and having a slot therein extending in a longitudinal direction from one end portion of said light source to the other end portion thereof permitting light rays transmitted through the transparent region of said light source to pass therethrough; means for cooling said light source, said cooling means being spaced from said light source; and means for regulating said cooling means and said heating means to maintain said light source substantially at about a predetermined temperature.

Claim 3

An illuminating apparatus as recited in claim 1, wherein said arcuate member extends circumferentially preferably, about 270*.

Claim 4

An illuminating apparatus as recited in claim 1, wherein said cooling means includes blower means adapted to create a flow of air upon said light source.

Claim 5

An illuminating apparatus as recited in claim 1, wherein said regulating means includes: a thermally responsive member contacting the exterior peripheral surface of said light source for detecting the temperature thereof; and circuit means operatively associated with said thermally responsive member for energizing said heating means when said thermally responsive member indicates that the temperature of said light source is beneath a predetermined value, said circuit means being adapted to de-energize said heating means when said thermally responsive member indicates that the temperature of said light source exceeds the predetermined value.

Claim 6

An illuminating apparatus as recited in claim 4, wherein the predetermined value of the temperature of said light source ranges from about 90* F to about 115* F, and preferably is about 100* F.

Claim 7

An illuminating apparatus, as recited in claim 1, wherein said regulating means includes a thermally responsive member contacting the exterior peripheral surface of said light source for detecting the temperature thereof, said thermally responsive member energizing said heating means when the temperature of said light source is beneath a predetermined lower value and de-energizing said heating means when the temperature of said light source is above a predetermined upper value.

Claim 8

An illuminating apparatus as recited in claim 6, wherein the lower value of the temperature of said light source preferably is about 100* F and the upper value of the temperature of said light source preferably is about 110* F.

Claim 9

A multi-color electrophotographic printing machine of the type having an apparatus for illuminating longitudinal sections of incremental width of an original document during the scanning thereof, and means for exposing a photoconductive surface to the light image thereof, wherein the improvement includes: a substantially elongated tri-phosphor light source having a substantially opaque region extending over a portion of the exterior circumferential surface thereof from about one end portion of said light source to about the other end portion thereof, and a substantially transparent region extending over the remaining portion of the exterior circumferential surface of said light source; heating means entrained substantially about the opaque region of the exterior circumferential surface of the light source and arranged to supply energy to the ligh source, said heating means being an arcuate member arranged to mount slidably on said light source in substantial contact with the opaque region of the exterior circumferential surface thereof, said arcuate member Extending in a longitudinal direction from about the region of one end portion of said light source to about the region of the other end portion thereof and having a slot therein extending in a longitudinal direction from one end portion of said light source to the other end portion thereof permitting light rays transmitted through the transparent region of said light source to pass therethrough; means for cooling the light source, said cooling means being spaced from the light source; and means for regulating said cooling means and said heating means to maintain the light source substantially at about a predetermined temperature.

Claim 10

A multi-color electrophotographic printing machine of the type having an apparatus for illuminating longitudinal sections of incremental width of an original document during the scanning thereof, and means for exposing a photoconductive surface to the light image thereof, wherein the improvement includes: a substantially elongated tri-phosphor light source having a substantially opaque region extending over a portion of the exterior circumferential surface thereof from about one end portion of said light source to about the other end portion thereof, and a substantially transparent region extending over the remaining portion of the exterior circumferential surface of said light source; heating means entrained substantially about the opaque region of the exterior circumferential surface of the light source and arranged to supply energy to the ligh source, said heating means being an arcuate member arranged to mount slidably on said light source in substantial contact with the opaque region of the exterior circumferential surface thereof, said arcuate member Extending in a longitudinal direction from about the region of one end portion of said light source to about the region of the other end portion thereof and having a slot therein extending in a longitudinal direction from one end portion of said light source to the other end portion thereof permitting light rays transmitted through the transparent region of said light source to pass therethrough; means for cooling the light source, said cooling means being spaced from the light source; and means for regulating said cooling means and said heating means to maintain the light source substantially at about a predetermined temperature.

Claim 11

A printing machine as recited as claim 8, wherein said arcuate member extends circumferentially preferably, about 270*.

Claim 12

A printing machine as recited in claim 8, wherein said cooling means includes blower means adapted to create a flow of air upon the light source.

Claim 13

A printing machine as recited in claim 8, wherein said regulating means includes: a thermally responsive member contacting the exterior peripheral surface of the light source for detecting the temperature thereof; and circuit means operatively associated with said thermally responsive member for energizing said heating means when said thermally responsive member indicates that the temperature of the light source is beneath a predetermined value, said circuit means being adapted to de-energize said heating means when said thermally responsive member indicates that the temperature of the light source exceeds the predetermined value.

Claim 14

A printing machine as recited in claim 11, wherein the predetermined value of the temperature of the light source ranges from about 90* F to about 115* F, and preferably is about 100* F.

Claim 15

A printing machine as recited in claim 8, wherein said regulating means includes a thermally responsive member contacting the exterior peripheral surface of the light source for detecting the temperature thereof, said thermally responsive member energizing said heating meanS when the temperature of the light source is beneath a predetermined lower value of de-energizing said heating means when the temperature of the light source is above a predetermined upper valve.

Claim 16

A printing machine as recited in claim 13, wherein the lower value of the temperature of the light source preferably is about 100* F and the upper valve of the temperature of the light source preferably is about 110* F.