Infrared lamp with carbon ribbon being longer than a radiation length

• US 6,534,904 B1
• Filed: 03/01/2000
• Issued: 03/18/2003
• Est. Priority Date: 03/19/1999
• Status: Expired due to Fees

• Current Assignee: Heraeus Noblelight GmbH (Heraeus Holding GMBH)
• Original Assignee: Heraeus Noblelight GmbH (Heraeus Holding GMBH)
• Inventors: Schmitz, Klaus, Scherzer, Joachim, Grob, Siegfried, Dieudonné, Walter
• Primary Examiner(s): Patel, Vip
• Assistant Examiner(s): QUARTERMAN, KEVIN J
• Application Number:
  US09/516,940
• Time in Patent Office: 1,112 Days
• Field of Search: 313/271, 313/273, 313/491, 313/631, 313/633, 313/25, 313/39, 313/45, 432/32
• US Class Current: 313/271
• CPC Class Codes: H01K 1/06 Carbon bodies
• CPC Class Codes: H01K 1/14 characterised by the shape
• CPC Class Codes: H05B 2203/032 Heaters specially adapted for heating by radiation heating
• CPC Class Codes: H05B 3/0057 for plastic handling and treatment including molds B29C
• CPC Class Codes: H05B 3/009 heating devices not specially adapted for a particular application

Abstract

An infrared lamp with a closed-off enveloping tube which encloses an emission source joined with contacts for a power supply in the form of a carbon ribbon which, extending in a direction of a long axis of the enveloping tube, determines an irradiation length of the infrared lamp in the sense of a higher irradiation output. The carbon ribbon has a length which is larger than the irradiation length by a factor of at least 1.5. With a procedure for heating a material to be processed using the infrared lamp, which makes possible short processing times in connection with a simultaneous high degree of energy efficiency, the infrared lamp may be operated such that its maximum emission lies within a wavelength range from 1.8 μm to 2.9 μm, and such that its power output comes to at least 15 Watts per cm³ of the volume enclosed by the enveloping tube over the irradiation length.

Claims

1. An infrared lamp with a closed enveloping tube comprising:

an emission source joined with contacts for a power supply in the form of a carbon ribbon which, extending in a direction of the long axis of the enveloping tube, determines an irradiation length of the infrared lamp, wherein the carbon ribbon has a length which is greater than the irradiation length by a factor in a range of 1.5 to 3.6.

2. An infrared lamp according to claim 1, wherein the carbon ribbon has a spiral shape.

3. An infrared lamp according to claim 1, wherein the carbon ribbon includes a plurality of folds.

4. An infrared lamp according to claim 1, wherein the carbon ribbon is bent to have a wave shape.

5. A process for heating a material to be processed using an infrared lamp according to claim 1, which permits a heating rate of at least 250°

C./second, wherein the infrared lamp is operated such that its emission maximum lies with a wavelength in a range from 1.8 μ

m to 2.9 μ

m, and in that its power output reaches at least 15 Watts per cm³ of volume enclosed by the enveloping tube over the irradiation length.

6. A process according to claim 5, wherein the maximum emission wavelength ranges from 2.3 μ

m to 2.7 μ

m.

7. An infrared lamp with a closed enveloping tube comprising:

emission means joined with contacts for a power supply which, extending in a direction of the long axis of the enveloping tube, determines an irradiation length of the infrared lamp, wherein the emission means has a length which is greater than the irradiation length by a factor in a range of 1.5 to 3.6.

8. A process for heating a material to be processed using an infrared lamp according to claim 7, which permits a heating rate of at least 250°

C./second, wherein the infrared lamp is operated such that its emission maximum lies with a wavelength in a range from 1.8 μ

m to 2.9 μ

m, and in that its power output reaches at least 15 Watts per cm³ of volume enclosed by the enveloping tube over the irradiation length.

9. A process according to claim 8, wherein the maximum emission wavelength ranges from 2.3 μ

m to 2.7 μ

m.