Camera device assembled with lens-to-sensor distance that reduces auto-focusing actuation power in macro mode
Embodiments of the present disclosure further relate to a camera device assembled such that to reduce (and in some cases minimize) auto-focusing actuation power when the camera device operates in a macro mode. The camera device includes an image sensor and a lens assembly in an optical series with the image sensor. During manufacturing of the camera device, the lens assembly is assembled within the camera device to have an optical axis substantially parallel to gravity and positioned to have an offset along the optical axis. The offset is determined during manufacturing of the camera device such that, when the camera device is in the macro mode, the lens assembly is positioned at a neutral position relative to the image sensor without actuation applied to the lens assembly.
1 . A camera device comprising:
an image sensor; and
a lens assembly in an optical series with the image sensor, wherein during manufacturing of the camera device,
the lens assembly is assembled within the camera device to have an optical axis substantially parallel to gravity and positioned to have an offset along the optical axis,
the offset is determined such that, when the camera device is in a macro mode, the lens assembly is positioned at a neutral position relative to the image sensor without actuation applied to the lens assembly;
wherein the lens assembly is focused at a first distance when the camera device is oriented sideways in the macro mode having the optical axis substantially orthogonal to gravity and the lens assembly is focused at a second distance closer than the first distance when the camera device is oriented downward in the macro mode having the optical axis substantially parallel to gravity.
2 . The camera device of claim 1 , wherein the neutral position corresponds to a target distance between the lens assembly and the image sensor.
3 . The camera device of claim 1 , wherein the neutral position corresponds to a target position in the macro mode where the lens assembly is focused at a distance less than a threshold distance.
4 . The camera device of claim 1 , wherein the lens assembly is positioned at the neutral position without actuation applied to the lens assembly when the camera device is oriented downward in the macro mode having the optical axis substantially parallel to gravity.
5 . The camera device of claim 1 , wherein the lens assembly is positioned at the neutral position with a level of actuation applied to the lens assembly of less than a threshold level, when the camera device is oriented sideways in the macro mode having the optical axis substantially orthogonal to gravity.
6 . The camera device of claim 1 , wherein, during assembling of the camera device, a support assembly coupled to the lens assembly controls the offset along the optical axis, the support assembly comprising a lens support and an actuator support.
7 . The camera device of claim 1 , wherein the offset is determined during assembling of the camera device based at least in part on a displacement of a carrier of the lens assembly under gravity at a downward posture of the camera device.
8 . The camera device of claim 7 , wherein the displacement depends on a weight of the carrier and a stiffness of a spring of an actuator coupled to the lens assembly.
9 . The camera device of claim 1 , wherein the camera device is part of a smartwatch.
10 . A wristband system comprising:
a watch band;
a watch body that is removably coupled to the watch band; and
a camera device located on the watch body, the camera device including an image sensor and a lens assembly in an optical series with the image sensor, wherein during manufacturing of the camera device,
the lens assembly is assembled within the camera device to have an optical axis substantially parallel to gravity and positioned to have an offset along the optical axis, and
the offset is determined such that, when the camera device is in a macro mode, the lens assembly is positioned at a neutral position relative to the image sensor without actuation applied to the lens assembly to reach the neutral position, wherein the lens assembly is focused at a first distance when the camera device is oriented sideways in the macro mode having the optical axis substantially orthogonal to gravity and the lens assembly is focused at a second distance closer than the first distance when the camera device is oriented downward in the macro mode having the optical axis substantially parallel to gravity.
11 . The wristband system of claim 10 , wherein the neutral position corresponds to a target position in the macro mode where the lens assembly is focused at a distance less than a threshold distance.
12 . The wristband system of claim 10 , wherein the lens assembly is positioned at the neutral position with a level of actuation applied to the lens assembly of less than a threshold level, when the camera device is oriented sideways in the macro mode having the optical axis substantially orthogonal to gravity.
13 . A method of manufacturing a camera device, the method comprising:
assembling a lens assembly within the camera device to have an optical axis substantially parallel to gravity;
determining an offset of the lens assembly along the optical axis such that, when the camera device is in a forward posture, the lens assembly is automatically positioned in its hyperfocal position without actuation applied to the lens assembly to reach the hyperfocal position; and
positioning the lens assembly within the camera device to be in an optical series with the image sensor and to have the determined offset along the optical axis, wherein the lens assembly is focused at a first distance when the camera device is oriented sideways in the macro mode having the optical axis substantially orthogonal to gravity and the lens assembly is focused at a second distance closer than the first distance when the camera device is oriented downward in the macro mode having the optical axis substantially parallel to gravity.
14 . The method of claim 13 , further comprising:
determining the offset during assembling of the camera device based at least in part on a height of a lens support and actuator support to achieve an automatic hyperfocal position.