Focus adjustment device, imaging device and focus adjustment method

Patent metadata

Field	Value
Publication number	US-9658429-B2
Application number	US-201615074030-A
Country	US
Kind code	B2
Filing date	Mar 18, 2016
Priority date	Oct 2, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A focus adjustment device comprises an image sensor having imaging pixels and focus detection pixels, which subjects light flux that is passed through a photographing lens to photoelectric conversion and outputs an image signal, a first memory which stores information relating to incident angle range of light flux that is incident towards the image sensor, a second memory which stores information relating to characteristics of the image sensor, and a calculation section which calculates information for focus adjustment based on output of the first memory and output of the second memory.

First claim

What is claimed is:

1. A focus adjustment device, comprising:
an image sensor having imaging pixels and focus detection pixels, which subjects light flux that is passed through a photographing lens to photoelectric conversion and outputs an image signal,
a first memory which stores information relating to angle of emission range of light flux that is emitted towards the image sensor, in accordance with image height,
a second memory which stores information relating to characteristics of the image sensor, and
a vibration section which corrects hand shake by causing movement of the image sensor in a direction perpendicular to the optical axis of the photographing lens, and outputs information relating to the movement of the image sensor, and
a calculation section which calculates information for focus adjustment based on output of the first memory, output of the second memory and output of the vibration section, wherein
the calculation section calculates information relating to corrected angle of emission range based on information related to the angle of emission range and information relating to the movement of the image sensor, and calculates information for focus adjustment based on the information relating to the corrected angle of emission range and information relating to characteristics of the image sensor.

2. The focus adjustment device of claim 1 , wherein the information relating to angle of emission range is incident angle and angular range of light flux.

3. The focus adjustment device of claim 1 , wherein the first memory retains information relating to angle of emission range for every state of the photographing lens.

4. The focus adjustment device of claim 3 , wherein the photographing lens has a zoom function, and a state of the photographing lens is information relating to zoom position.

5. The focus adjustment device of claim 3 , wherein the photographing lens has a focus lens, and a state of the photographing lens is information relating to position of the focus lens.

6. The focus adjustment device of claim 3 , wherein the photographing lens has an aperture, and a state of the photographing lens is information relating to opening of the aperture.

7. The focus adjustment device of claim 1 , wherein the information relating to characteristics of the image sensor is an oblique-incidence characteristic of the focus detection pixels.

8. The focus adjustment device of claim 1 , wherein the information relating to characteristics of the image sensor is a conversion coefficient for converting phase difference detection information to a defocus amount based on output of the focus detection pixels, with respect to incident angle range of light flux that is incident on the image sensor.

9. The focus adjustment device of claim 1 , wherein the information relating to characteristics of the image sensor is information relating to individual differences of the oblique-incidence characteristic.

10. An imaging device, having a lens section which guides light flux that has passed through a photographing lens and a body section capable of being fitted to the lens section, comprising:
an image sensor having imaging pixels and focus detection pixels, which subjects light flux that is passed through a photographing lens to photoelectric conversion and outputs an image signal,
a first memory, provided in the lens section, which stores information relating to angle of emission range in accordance with image height of light flux that is emitted towards the image sensor,
a second memory, provided in the body section, which stores information relating to characteristics of the image sensor, and
the body section is provided with a vibration section which corrects hand shake by causing movement of the image sensor in a direction perpendicular to the optical axis of the photographing lens, and outputs information relating to the movement of the image sensor, and
a calculation section which calculates information for focus adjustment based on output of the first memory, output of the second memory and output of the vibration section,
wherein
the calculation section calculates information relating to corrected angle of emission range based on information related to the angle of emission range and information relating to the movement of the image sensor, and calculates information for focus adjustment based on the information relating to the corrected angle of emission range and information on characteristics of the image sensor.

11. The imaging device of claim 10 , wherein the information relating to angle of emission range is incident angle and angular range of light flux.

12. The imaging device of claim 10 , wherein the first memory retains information relating to angle of emission range for every state of the photographing lens.

13. The imaging device of claim 12 , wherein the photographing lens has a zoom function, and a state of the photographing lens is information relating to zoom position.

14. The imaging device of claim 12 , wherein the photographing lens has a focus lens, and a state of the photographing lens is information relating to position of the focus lens.

15. The imaging device of claim 12 , wherein the photographing lens has an aperture, and a state of the photographing lens is information relating to opening of the aperture.

16. The imaging device of claim 10 , wherein the information relating to characteristics of the image sensor is an oblique-incidence characteristic of the focus detection pixels.

17. The imaging device of claim 10 , wherein the information relating to characteristics of the image sensor is a conversion coefficient for converting phase difference detection information to a defocus amount based on output of the focus detection pixels, with respect to incident angle range of light flux that is incident on the image sensor.

18. The imaging device of claim 10 , wherein the information relating to characteristics of the image sensor is information relating to individual differences of the oblique-incidence characteristic.

19. A focus adjustment method for an imaging device, having a lens section, which guides light flux that has passed through a photographing lens, a body section, comprising an image sensor having imaging pixels and focus detection pixels, which subjects light flux that has passed through the photographing lens, that is capable of being fitted to the lens section, to photoelectric conversion and outputs an image signal, and a vibration section which corrects hand shake by causing movement of the image sensor in a direction perpendicular to the optical axis of the photographing lens, and outputs information relating to the movement of the image sensor, comprising
reading out information relating to angle of emission range in accordance with image height of light flux that is emitted towards the image sensor from the lens section,
reading out information on characteristics of the image sensor from the body section, and
calculating information relating to corrected angle of emission range based on information related to the angle of emission range and output of the vibration section, and calculates information for focus adjustment based on the information relating to the corrected angle of emission range and information on characteristics of the image sensor.

20. The focus adjustment method of claim 19 , wherein the information relating to angle of emission range is incident angle and angular range of light flux.

Assignees

• Olympus Corp

Inventors

• Ito Kazumi
• Matsuo Keigo
• Ito Satoru

Classifications

• H04N25/704

  Pixels specially adapted for focusing, e.g. phase difference pixel sets · CPC title

• H04N23/682

  Vibration or motion blur correction · CPC title

• H04N23/672

  based on the phase difference signals · CPC title

• H04N23/687

  by shifting the lens or sensor position · CPC title

• G03B13/36

  Autofocus systems · CPC title