Compact stationary lens optical zoom image capture system
View Patent ↗An electronic optical zoom system ( 100 ) includes a first lens assembly ( 101 ) and a second lens assembly ( 102 ). The first lens assembly ( 101 ) and the second lens assembly ( 102 ) may be adjacently disposed or concentrically disposed. The first lens assembly ( 101 ) and second lens assembly ( 102 ), in one embodiment, have different magnification configurations. An image sensor ( 103 ) captures electronic images of a subject ( 109 ). Optical zoom capability is achieved by an alterable electronic optical device ( 851 ), such as a switchable mirror ( 105 ). The alterable electronic optical device ( 851 ) selectively redirects received light between a first optical path ( 107 ) from a reflective surface ( 106 ) to a second optical path ( 117 ) from the alterable electronic optical device ( 851 ) depending upon the state of the alterable electronic optical device ( 851 ). The electronic optical zoom system ( 100 ) thereby provides optical zoom capabilities in a compact package without the need for physically moving lens assemblies.
1. An electronic optical zoom system, comprising:
a first lens assembly having a first magnification and a second lens assembly having a second magnification, each lens assembly for collecting and receiving light;
an image sensor;
a switchable mirror axially aligned with the first lens assembly and having electronically selectable states comprising a reflective state and a pellucid state, and being disposed along a first reflected optical path from the first lens assembly and the image sensor;
a reflective surface axially aligned with the second lens assembly;
wherein the first lens assembly and the second lens assembly are stationary relative to the image sensor, and a system image magnification can be varied by electronically altering a state of the switchable mirror to:
redirect the light from the first lens assembly along the first reflected optical path to the image sensor when the switchable mirror is in the reflective state; and
redirect the light from the second lens assembly to the image sensor along a second reflected optical path, through the switchable mirror, when the switchable mirror is in the pellucid state.
2. The electronic optical zoom system of claim 1 , wherein the first lens assembly and the second lens assembly are adjacently disposed.
3. The electronic optical zoom system of claim 1 , wherein the first lens assembly and the second lens assembly are concentrically disposed.
4. The electronic optical zoom system of claim 1 , wherein the reflective surface and the image sensor are concentrically aligned.
5. The electronic optical zoom system of claim 4 , wherein the first lens assembly is axially aligned with the image sensor.
6. The electronic optical zoom system of claim 1 , further comprising a first switchable iris mirror having first electronically variable aperture states, and disposed so as to limit first lens assembly light upon selection of a first switchable iris mirror aperture state.
7. The electronic optical zoom system of claim 6 , further comprising a second switchable iris mirror having second electronically variable aperture states, and disposed so as to limit second lens assembly light upon selection of a second switchable iris mirror aperture state.
8. The electronic optical zoom system of claim 7 , further comprising an iris control module coupled to the first switchable iris mirror and the second switchable iris mirror, wherein the iris control module is configured select one of the first electronically variable aperture states for the first switchable iris mirror and one of the second electronically variable aperture states for the second switchable iris mirror.
9. The electronic optical zoom system of claim 1 , further comprising a controller coupled to the switchable mirror and the image sensor, wherein the controller is configured to electronically alter the switchable mirror to the reflective state and capture a first magnification image with the image sensor.
10. The electronic optical zoom system of claim 9 , wherein the controller is further configured to electronically alter the switchable mirror to the pellucid state and capture a second image magnification image with the image sensor.
11. The electronic optical zoom system of claim 1 , further comprising light absorbing material disposed such that when the switchable mirror is in the pellucid state, light passes through the switchable mirror to the light absorbing material.
12. The electronic optical zoom system of claim 11 , wherein the reflective surface comprises a second switchable mirror having electronically selectable varying reflectivity states comprising a second switchable mirror pellucid state and a second switchable mirror reflective state.
13. The electronic optical zoom system of claim 12 , further comprising additional light absorbing material disposed such that when the second switchable mirror is in the second switchable mirror pellucid state, light passes through the second switchable mirror to the additional light absorbing material.
14. A portable electronic device comprising an electronically alterable optical zoom system, the electronically alterable optical zoom system comprising:
an image sensor;
a first lens assembly and a second lens assembly, each of the first lens assembly and the second lens assembly being configured to capture and direct light to the image sensor, each of the first lens assembly and the second lens assembly having a different magnification;
a switchable mirror axially aligned with the first lens assembly and having electronically selectable states comprising a reflective state and a pellucid state, and being disposed along a first reflected optical path from the first lens assembly and the image sensor; and
a reflective surface axially aligned with the second lens assembly.
15. The portable electronic device of claim 14 , further comprising a controller coupled to the switchable mirror to alter light received by the image sensor from the first reflected optical path to a second reflected optical path, thereby altering an image magnification detected by the image sensor, by electronically changing an electrically selectable state of the switchable mirror.
16. The portable electronic device of claim 14 , the reflective surface disposed so as to direct incident light to the image sensor along the first reflected optical path.