Vision system camera with mount for multiple lens types

• US 10,067,312 B2
• Filed: 02/02/2015
• Issued: 09/04/2018
• Est. Priority Date: 11/22/2011
• Status: Active Grant

• Current Assignee: Cognex Corporation
• Original Assignee: Cognex Corporation
• Inventors: Nunnink, Laurens
• Primary Examiner(s): Tissire, Abdelaaziz
• Application Number:
  US14/611,401
• Publication Number:
  US 20160011396A1
• Time in Patent Office: 1,310 Days
• CPC Class Codes: G02B 26/005 based on electrowetting
• CPC Class Codes: G02B 3/14 of variable focal length
• CPC Class Codes: G02B 7/022 lens and mount having complementary engagement means, e.g. screw/thread
• CPC Class Codes: G02B 7/14 adapted to interchange lenses G02B7/027 takes precedence
• CPC Class Codes: G03B 17/02 Bodies
• CPC Class Codes: G03B 17/14 interchangeably
• CPC Class Codes: H04N 23/51 Housings
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof

Abstract

This invention provides a vision system housing having a front plate assembly that accommodates a plurality of lens mount types. The front plate includes a central aperture that is located at a predetermined axial (camera axis) distance from a plane of an image sensor. The aperture is stepped from a wider diameter adjacent to the front to a narrower diameter more adjacent to the sensor. This arrangement enables threaded mounting of a plurality of lens mount types, for example M12 and C-Mount. The threaded base for the M12 lens is provided in the smaller-diameter, interior portion of the front plate aperture, adjacent to the sensor. The threaded base for the C-Mount lens is provided at the front of the front plate, adjacent to the exterior surface of the front plate and housing. The exterior (front) surface of the front plate includes threaded holes and a removable spring clip arrangement constructed and arranged to accommodate a liquid lens positioned over the aperture with an associated lens assembly mounted within the aperture and in optical communication with the liquid lens. The lens is operated using an electrical connection provided by a cable that interconnects with a multi-pin socket positioned on the front plate aside the aperture. The socket interconnects with processor circuitry within the housing.

Claims

1. A vision system housing comprising:

a front plate assembly defining an aperture aligned relative to an image sensor located within an interior of the vision system housing, the aperture including an outer step having a first diameter and an inner step have a second diameter smaller than the first diameter;

the outer step being constructed and arranged to receive a C-mount lens base and the inner step is constructed and arranged to receive a lens base having a thread diameter smaller than the C-mount lens base; and

a counter ring engaged with the lens base at a predetermined location such that, when the counter ring engages a front face between the outer step and the inner step, the lens base is positioned at a predetermined distance from the image sensor.

2. The vision system of claim 1, wherein a thread pitch of the outer step is female-threaded to a pitch of 32 threads per inch (TPI).

3. The vision system of claim 1, wherein the lens base comprises an M12 lens base.

4. The vision system of claim 3, wherein the counter ring is adhered to the M12 lens.

5. The vision system of claim 1, wherein the lens base can be engaged and disengaged with the inner step.

6. The vision system of claim 1, further comprising a liquid lens assembly comprising the lens base such that the inner step is constructed and arranged to receive the lens base of the liquid lens assembly.

7. The vision system of claim 6, further comprising a counter ring engaged with the liquid lens assembly at a predetermined location such that, when the counter ring that engages with the front face disposed between the outer step and the inner step, the liquid lens assembly is disposed at a predetermined distance from the image sensor.

8. The vision system of claim 1, further comprising a plurality of connection sockets disposed on a face of the front assembly, the plurality of connection sockets respectively configured to engage with a liquid lens assembly and an illumination assembly.

9. The vision system of claim 8, wherein a thread pitch of the outer step is female-threaded to a pitch of 32 threads per inch (TPI).

10. A vision system housing comprising:

a front plate assembly defining an aperture aligned relative to an image sensor located within an interior of the housing, the aperture including an outer step having a first diameter and in inner step have a second diameter smaller than the first diameter;

the outer step being constructed and arranged to receive a C-mount lens base and the inner step being constructed and arranged to receive a lens base distinct from the C-mount lens base; and

a counter ring engaged with the lens base at a predetermined location such that, when the counter ring engages a front face between the outer step and the inner step, the lens base is positioned at a predetermined distance from the image sensor.

11. A vision system housing comprising:

a front plate assembly defining an aperture aligned relative to an image sensor located within an interior of the vision system housing, the aperture including an outer step having a first diameter and an inner step have a second diameter smaller than the first diameter;

the outer step being constructed and arranged to receive a C-mount lens base and the inner step being constructed and arranged to receive a lens adapter distinct from the C-mount lens base; and

a counter ring engaged with the lens adapter at a predetermined location such that, when the counter ring engages a front face between the outer step and the inner step, the lens adapter is positioned at a predetermined distance from the image sensor.