Method of and apparatus for testing a nozzle of a pick-and-place system

• US 5,925,835 A
• Filed: 10/13/1997
• Issued: 07/20/1999
• Est. Priority Date: 10/13/1997
• Status: Expired due to Fees

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Solanki, Ranvir Singh, Kent, Kevin
• Primary Examiner(s): Williams, Hezron
• Assistant Examiner(s): Soliz, Chad
• Application Number:
  US08/949,259
• Time in Patent Office: 645 Days
• Field of Search: 73/865.9, 73/1.59, 73/37, 73/706, 29/709
• US Class Current: 73/865.9
• CPC Class Codes: H05K 13/0409 Sucking devices
• CPC Class Codes: H05K 13/082 Integration of non-optical monitoring devices, i.e. using non-optical inspection means, e.g. electrical means, mechanical means or X-rays
• CPC Class Codes: Y10T 29/53039 with control means energized in response to activator stimulated by condition sensor

Abstract

An apparatus (200) and method are provided for testing a nozzle of a pick-and-place system (100). The apparatus (200) includes a reservoir (206) configured to carry a fluid, a membrane (204) covering an opening of the reservoir (206), and a reservoir pressure sensor. The apparatus may further include a processor (118) coupled to the reservoir pressure sensor (208) and an output device (116) coupled to the processor (118). The nozzle (104) is positioned to contact and displace the membrane (204), thus changing the pressure of the fluid within the reservoir (206). The reservoir pressure sensor (208) senses pressure changes within the reservoir (206) and generates a signal that varies in response to the displacement of the membrane. The signal is compared to a predetermined signal to detect whether the nozzle has the proper position, the proper alignment, sufficient vacuum, and other errors affecting pick-and-place systems.

Claims

1. An apparatus for testing a nozzle of a pick-and-place system, said apparatus comprising:

a durable body forming a reservoir with an opening, said reservoir configured to carry a fluid;

a membrane covering the opening of said reservoir and sized to receive contact from the nozzle, wherein the membrane is positioned for contact with a nozzle of the pick-and-place system; and

a reservoir pressure sensor positioned to sense a pressure of the fluid within the reservoir.

2. The apparatus according to claim 1, wherein said reservoir pressure sensor is configured to generate at least one signal that varies in response to displacement of said membrane.

3. The apparatus according to claim 2, wherein the at least one signal is responsive to non-displacement of said membrane.

4. The apparatus according to claim 2, further comprising:

a processor coupled to receive the at least one signal from said reservoir pressure sensor.

5. The apparatus according to claim 4, wherein said processor compares the at least one signal to at least one predetermined signal to perform at least one error function, said apparatus further comprising:

an output device coupled to said processor, said output device to output at least one error response based on the at least one error function.

6. The apparatus according to claim 1, wherein said membrane is provided in a component presentation area of the pick-and-place system.

7. A pick-and-place system capable of testing a nozzle, comprising:

a positioning device;

at least one nozzle mounted to said positioning device;

a durable body forming a reservoir with an opening, said reservoir configured to carry a fluid;

a membrane covering the opening of said reservoir, said membrane positioned at or near a component presentation area of the pick-and-place system;

a reservoir pressure sensor positioned to sense a pressure of the fluid within the reservoir; and

a processor coupled to said reservoir pressure sensor.

8. The pick-and-place system according to claim 7,

wherein said reservoir pressure sensor generates at least one signal responsive to displacement of said membrane,

wherein said processor receives the at least one signal from said reservoir pressure sensor, the processor comparing the at least one signal with at least one predetermined signal to perform at least one error function.

9. The apparatus according to claim 8, wherein the at least one signal is responsive to non-displacement of said membrane.

10. The pick-and-place system according to claim 7, further comprising an output device coupled to said processor.

11. A method of testing a nozzle of a pick-and-place system, the method comprising the steps of:

positioning the nozzle for contact with a membrane;

attempting to displace the membrane using the nozzle; and

generating at least one signal that varies in response to displacement of the membrane.

12. The method according to claim 11, wherein the step of generating at least one signal includes the substep of generating at least one signal responsive to non-displacement of said membrane.

13. The method according to claim 11, further comprising the steps of:

comparing the at least one signal with at least one predetermined signal; and

performing at least one error function in response to the step of comparing.

14. The method according to claim 13, wherein the step of performing at least one error function includes the step of generating an error response indicative of an error in a height of the nozzle.

15. The method according to claim 13, wherein the step of performing at least one error function includes the step of generating an error response indicative of an error in a center position of the nozzle.

16. The method according to claim 13, wherein the step of performing at least one error function includes the step of generating an error response indicative of an error in a vacuum force of the nozzle.

17. The method according to claim 11, wherein the step of attempting to displace the membrane results in displacing at least a portion of the membrane to a flexed position.

18. The method according to claim 17, wherein the step of generating at least one signal includes the step of generating at least one signal having a voltage corresponding to the flexed position, the method further comprising the steps of:

comparing the voltage and a predetermined voltage; and

performing at least one error function in response to the step of comparing.

19. A method of testing a nozzle of a pick-and-place system, the method comprising the steps of:

positioning the nozzle for contact with a membrane;

providing a vacuum force in the nozzle;

moving the nozzle to displace the membrane; and

generating at least one signal that varies in response to displacement of the membrane.

20. The method according to claim 19, wherein the step generating at least one signal includes the substep of generating at least one signal responsive to non-displacement of said membrane.

21. The method according to claim 19, further comprising the steps of:

comparing the at least one signal and at least one predetermined signal; and

performing at least one error function in response to the step of comparing.

22. The method according to claim 21, wherein the step of performing at least one error function includes the step of generating an error response indicative of an error in the vacuum force.

23. The method according to claim 19, wherein the step of moving the nozzle results in displacing at least a portion of the membrane to a flexed position.

24. The method according to claim 23, wherein the step of generating at least one signal includes the step of generating at least one signal having a voltage corresponding to the flexed position, the method further comprising the steps of:

comparing the voltage and a predetermined voltage; and

performing at least one error function in response to the step of comparing.