Optical product cure oven

• US 7,452,431 B2
• Filed: 09/28/2004
• Issued: 11/18/2008
• Est. Priority Date: 07/30/2004
• Status: Active Grant

• Current Assignee: II-VI Delaware, Inc. (Coherent Corp.)
• Original Assignee: Finisar Corporation (II-VI Incorporated)
• Inventors: Jannati, Mansour, Johnson, Christopher W., Gilkerson, Jack A.
• Primary Examiner(s): KOCH, GEORGE R
• Application Number:
  US10/953,218
• Publication Number:
  US 20060032573A1
• Time in Patent Office: 1,512 Days
• Field of Search: 156/64, 156/285, 156/381, 432/4, 432/24
• US Class Current: 156/64
• CPC Class Codes: F27B 17/0016 Chamber type furnaces
• CPC Class Codes: F27D 19/00 Arrangements of controlling devices
• CPC Class Codes: F27D 2019/0003 Monitoring the temperature or a characteristic of the charge and using it as a controlling value
• CPC Class Codes: F27D 2019/0006 Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
• CPC Class Codes: F27D 2021/0007 Monitoring the pressure
• CPC Class Codes: F27D 21/0014 Devices for monitoring temperature

Abstract

A cure oven comprises a sealable door and one or more pressure valves mounted inside for curing optical subcomponents that have been assembled using an adhesive. The cure oven comprises a chamber that can be configured to receive several hundreds of assembled optical subcomponents. The cure oven is further coupled to a computerized system via a drive motor. The computerized system initiates the heating and cooling sequences, and indicates whether the door can be opened, or must remain shut. The cure oven maintains a certain pressure inside the oven chamber consistent with a rise in temperature, allowing assembled optical subcomponents to be cured at a much higher rate than possible without disassembling, or being damaged.

Claims

1. A method for curing adhesive used in the joining together of one or more optical sub-components of an optical component, the method comprising the acts of:

pressurizing a gas inside an oven chamber within which the optical sub-components are disposed;

adjusting the temperature within the oven chamber to a target curing temperature;

monitoring the gas pressure in the oven chamber;

if the gas pressure inside the oven chamber is too low at the target temperature compared to an ideal gas pressure, increasing the gas pressure inside the oven chamber until the gas pressure in the oven chamber is substantially equal to the ideal gas pressure; and

if the gas pressure inside the oven chamber is too high at the target temperature compared to the ideal gas pressure, reducing the gas pressure inside the oven chamber until the gas pressure in the oven chamber is substantially equal to the ideal gas pressure.

2. The method as recited in claim 1, further comprising an act of adjusting the temperature inside the oven chamber to a target cooling temperature.

3. The method as recited in claim 2, further comprising depressurizing the oven chamber after the adhesive joining the optical sub-components has been cured.

4. The method as recited in claim 1, wherein the one or more optical components comprise one or more optical sub-assemblies, each optical sub-assembly comprising a TOSA or a ROSA.

5. The method as recited in claim 1, wherein one of the acts is controlled by a computerized system.

6. The method as recited in claim 5, wherein the target curing temperature and ideal pressure are obtained from a table on the computerized system.

7. The method as recited in claim 1, further comprising adjusting the temperature inside the pressurized oven chamber to a second target curing temperature after a specified time period.

8. The method as recited in claim 7, further comprising adjusting the pressure inside the pressurized oven chamber to a second ideal pressure corresponding to the second target curing temperature.

9. A method for manufacturing an optical component, the method comprising the acts of

assembling, for each optical component, one or more optical sub-components together with an adhesive into an assembled optical component;

positioning the one or more assembled optical components in an oven chamber;

identifying an initial temperature and an initial pressure inside the oven chamber;

changing the temperature in the oven chamber to a subsequent temperature within a predetermined time period;

identifying an ideal pressure based at least in part on the initial pressure, the initial temperature, and the sub sequent temperature;

comparing a subsequent pressure inside the oven chamber with the ideal pressure; and

adjusting the pressure inside the oven chamber if the subsequent pressure is different from the ideal pressure.

10. The method as recited in claim 9, further comprising heating the one or more assembled optical components to a desired temperature for a predetermined time period after reaching a b-stage temperature for the adhesive.

11. The method as recited in claim 10, wherein heating the one or more assembled optical components is performed in a second oven.

12. The method as recited in claim 10, further comprising:

identifying that the temperature in the oven chamber has dropped unexpectedly; and

maintaining the pressure in the oven chamber at a constant value.

13. The method as recited in claim 9, wherein the one or more optical sub-components comprises 500 or more optical sub-components.

14. The method as recited in claim 9, wherein the one or more optical components comprise one or more optical sub-assemblies, each optical sub-assembly comprising a TOSA or a ROSA.

15. The method as recited in claim 9, wherein one of the acts is controlled by a computerized system.

16. The method as recited in claim 9, wherein the ideal pressure is proportional to the subsequent temperature.

17. The method as recited in claim 9, wherein the ideal pressure is inversely proportional to the initial temperature.

18. The method as recited in claim 9, wherein the ideal pressure is proportional to the initial pressure.