Combined actuator for camera shutter and focus functions

• US 7,480,451 B2
• Filed: 06/29/2006
• Issued: 01/20/2009
• Est. Priority Date: 08/17/2005
• Status: Expired due to Fees

• Current Assignee: Analog Devices, Inc.
• Original Assignee: Nokia Corporation
• Inventors: Ollila, Mikko A., Haila, Olli-Pekka
• Primary Examiner(s): KOVAL, MELISSA J
• Application Number:
  US11/477,881
• Publication Number:
  US 20070081805A1
• Time in Patent Office: 936 Days
• Field of Search: 396/76, 396/77, 396 79- 83, 396 85- 87, 398/79, 235/375, 348/222, 348/233, 348/211, 348/222.1, 348/211.99, 348/552, 348/E5.042, 348/E5.044, 348/E9.01, 348/223
• US Class Current: 396/79
• CPC Class Codes: H02N 2/0015 using only bending modes
• CPC Class Codes: H02N 2/0075 Electrical details, e.g. drive or control circuits or methods
• CPC Class Codes: H02N 2/026 by pressing one or more vibrators against the driven body

Abstract

The combined actuator described can be incorporated into a miniaturized camera product. In the camera product, the shutter driver uses the focus or zoom actuator'"'"'s power amplifiers to control the current flow in shutter actuators. As such, the space needed for the camera'"'"'s electronics is smaller and it is less expensive to manufacture the camera product.

Claims

1. A driver configured to provide electric current to a zoom/auto focus driver and a light control driver, the driver comprising:

first switches configured to couple to a first actuator;

second switches configured to couple to a second actuator, wherein the first and second switches are coupled to the light control driver; and

multiplexer selecting inputs to the first and second switches.

2. The driver of claim 1, wherein the first switches comprise two MOSFET devices.

3. The driver of claim 1, wherein the light control element comprises a camera shutter.

4. The driver of claim 1, wherein the driver is part of a camera integrated in a mobile communication device.

5. The driver of claim 1, further comprising third switches configured to couple to the second actuator and a shutter.

6. The driver of claim 5, wherein to open the shutter the second switches are opened, one of the first switches and one of the third switches are opened, and one of the first switches and one of the third switches are closed.

7. The driver of claim 1, wherein the light control element comprises a camera iris/ND filter.

8. The driver of claim 1, wherein the light control element comprises a camera shutter and a camera iris/ND filter.

9. The driver of claim 1, wherein the multiplexer selects gate control voltage or a pulse width modulation (PWM) pattern.

10. The driver of claim 1, wherein the first and second actuators are class-D actuators coupled to an autofocus/zoom actuator driver.

11. A combination system that drives a camera shutter and camera filter as well as a camera autofocus and zoom control, the system comprising:

a filter coupled to a first plurality of MOSFETs;

a shutter coupled to a second plurality of MOSFETs; and

actuators coupled to a third plurality of MOSFETs, wherein the first plurality of MOSFETS includes first, second, third and fourth MOSFETs, the second plurality of MOSFETs includes first, second, fifth and sixth MOSFETs, and the third plurality of MOSFETs includes third, fourth, fifth and sixth MOSFETs.

12. The system of claim 11, further comprising a first multiplexer selecting between a gate control voltage and a pulse width modulation (PWM) pattern for the third MOSFET.

13. The system of claim 12, further comprising a second multiplexer selection, a gate control voltage and the PWM pattern for the fifth MOSFET.

14. The system of claim 11, wherein the actuators are coupled to zoom and autofocus lenses, and the zoom and autofocus lenses cannot be operated simultaneously.

15. A method of driving a camera shutter, a camera filter, a camera zoom lens, and a camera autofocus lens, the method comprising:

opening a camera shutter by closing a first switch, opening a second switch, opening a fifth switch, and closing a sixth switch;

driving a camera zoom lens by opening the first and second switches and selectively manipulating actuators using third, fourth, fifth and sixth switches; and

opening a camera filter by opening a first switch, closing a second switch, opening a third switch, and closing a fourth switch.

16. The method of claim 15, wherein the third switch is coupled to a first multiplexer selecting between a gate control voltage and a pulse width modulation (PWM) pattern.

17. The method of claim 16, wherein the fifth switch is coupled to a second multiplexer selecting between the gate control voltage and the PWM pattern.

18. The method of claim 15, wherein the switches are MOSFET devices.

19. The method of claim 15, wherein the camera filter is an iris filter.

20. The method of claim 15, wherein the camera zoom lens cannot be driven while the camera shutter is in operation.

21. A camera driver providing electric current to a plurality of actuators using fewer output terminals than actuators, the camera driver comprising:

first switches configured to couple to a first actuator using a first output;

second switches configured to couple to a second actuator using a second output, wherein the first and second switches are coupled to a light control driver, wherein the light control driver comprises the second actuator and a third actuator;

multiplexer selecting inputs to the first and second switches; and

third switches configured to couple to a fourth actuator using a third output.

22. An integrated circuit, comprising:

first switches configured to couple to a first actuator; and

second switches configured to couple to a second actuator, wherein the first and second switches are coupled to the light control driver; and

multiplexer selecting inputs to the first and second switches.