IMAGE SENSOR SYSTEM WITH AN AUTOMATIC FOCUS FUNCTION

1 . An imaging system comprising:

a first image sensor that includes imaging pixels and phase detection pixels;

a first lens module that is configured to focus light on the first image sensor;

a second image sensor that does not include phase detection pixels;

a second lens module that is configured to focus light on the second image sensor; and

processing circuitry that is configured to adjust the second lens module based on phase detection data from the phase detection pixels.

2 . The imaging system defined in claim 1 , wherein the first image sensor is a monochrome image sensor.

3 . The imaging system defined in claim 2 , wherein the second image sensor is a color image sensor.

4 . The imaging system defined in claim 3 , wherein the monochrome image sensor is configured to detect white light.

5 . The imaging system defined in claim 3 , wherein the monochrome image sensor comprises a color filter material that covers all of the pixels in the monochrome image sensor.

6 . The imaging system defined in claim 5 , wherein the color filter material is configured to pass light of a given type, wherein the given type is selected from the group consisting of: visible light, infrared light, near-infrared light, and ultraviolet light.

7 . The imaging system defined in claim 1 , further comprising a plurality of microlenses, wherein the phase detection pixels are organized in phase detection pixel groups, and wherein each phase detection pixel group of the phase detection pixel groups comprises adjacent pixels covered by a single microlens of the plurality of microlenses.

8 . (canceled)

9 . The imaging system defined in claim 7 , wherein at least one phase detection pixel group includes a shielding element that covers portions of underlying pixels.

10 . The imaging system defined in claim 1 , wherein the phase detection pixels are organized in phase detection pixel groups, and wherein a first phase detection pixel group of the phase detection pixel groups comprises a 1×3 group of pixels covered by a single microlens.

11 . A method of operating an imaging system, wherein the imaging system includes at least one monochrome sensor and at least one color sensor, and wherein the at least one monochrome sensor includes phase detection pixels, the method comprising:

with the phase detection pixels, generating phase detection pixel data;

based on the phase detection pixel data, adjusting a first lens, wherein the first lens is positioned above the at least one color sensor; and

based on the phase detection pixel data, adjusting a second lens, wherein the second lens is positioned above the at least one monochrome sensor.

12 . (canceled)

13 . The method defined in claim 11 , wherein the at least one color sensor does not include any phase detection pixels.

14 . (canceled)

15 . An imaging system comprising:

a monochrome image sensor, wherein the monochrome image sensor includes phase detection pixels and imaging pixels, wherein the phase detection pixels comprise first and second phase detection pixels covered by a first microlens, and wherein each imaging pixel of the imaging pixels is covered by a respective single microlens;

a first lens module that is configured to focus light on the monochrome image sensor;

a color image sensor, wherein the color image sensor includes imaging pixels, wherein the color image sensor does not include phase detection pixels, wherein the color image sensor comprise a color filter array with a plurality of color filter elements, and wherein the plurality of color filter elements includes at least color filter elements of a first color and color filter elements of a second color that is different than the first color;

a second lens module that is configured to focus light on the color image sensor; and

processing circuitry that is configured to receive data from the monochrome image sensor and color image sensor and adjust the second lens module based on the data received from the phase detection pixels of the monochrome image sensor.

16 . (canceled)

17 . (canceled)

18 . The imaging system defined in claim 15 , wherein the processing circuitry is configured to adjust the first lens module based on the data received from the phase detection pixels of the monochrome image sensor.

19 . (canceled)

20 . The imaging system defined in claim 15 , wherein the plurality of color filter elements are arranged according to a Bayer color filter pattern.

21 . The imaging system defined in claim 7 , wherein each imaging pixel of the first image sensor is covered by a single microlens of the plurality of microlenses.

22 . The imaging system defined in claim 21 , wherein the first image sensor does not receive light from the second lens module.

23 . The imaging system defined in claim 22 , wherein the second image sensor does not receive light from the first lens module.

24 . The imaging system defined in claim 11 , wherein the first lens is configured to focus light on the at least one color sensor without focusing light on the at least one monochrome sensor.

25 . The imaging system defined in claim 24 , wherein the second lens is configured to focus light on the at least one monochrome sensor without focusing light on the at least one color sensor.

26 . The imaging system defined in claim 15 , wherein the monochrome image sensor includes a first total number of pixels, wherein the color image sensor includes a second total number of pixels, and wherein the first total number of pixels is equal to the second total number of pixels.