Low z-height camera module with aspherical shape blue glass
A blue glass infrared cutoff filter is disclosed that contains an aspheric epoxy replicated on a first surface of the infrared cutoff filter. The aspheric epoxy and blue glass infrared cutoff filter may be a component of a camera device that includes a lens barrel with one or more lenses disposed therein. The camera device may include a sensor for detecting light received by the camera device. The sensor may be connected to circuitry that dispatches the detection data generated by the sensor to a processor of a device into which the camera device has been incorporated.
1. A camera device, comprising:
a lens barrel;
at least one lens disposed inside the lens barrel;
a blue glass infrared cutoff filter;
an aspheric epoxy surface disposed on a first surface of the blue glass infrared cutoff filter, wherein the aspheric epoxy surface has two convex portions with a valley between the two convex portions on only a front surface of the aspheric epoxy surface; and
a sensor disposed to receive light transmitted through the at least one lens disposed inside the lens barrel and the blue glass infrared cutoff filter, the sensor disposed in direct physical contact with a second surface of the blue glass infrared cutoff filter, the second surface opposite of the first surface,
wherein the device is configured to produce a modulation transfer function with a value greater than 0.4 for a field of view less than 35 degrees.
2. The device of claim 1 , further comprising a circuit configured to receive detection data from the sensor and send it to a processor.
3. The device of claim 1 , wherein the blue glass infrared cutoff filter is glued to the sensor.
4. The device of claim 1 , wherein the blue glass infrared cutoff filter is disposed inside the lens barrel.
5. The device of claim 1 , wherein a mold for the aspheric epoxy surface is aligned to the blue glass infrared cutoff filter prior to disposing the aspheric epoxy surface on the first surface of the blue glass infrared cutoff filter.
6. The device of claim 1 , wherein the lens barrel is aligned to the sensor.
7. The device of claim 1 , wherein the lens barrel is aligned to the sensor within a tolerance of not more than 10 μm.
8. The device of claim 1 , wherein the blue glass infrared cutoff filter is disposed outside of the lens barrel.
9. The device of claim 1 , wherein the device is configured to produce a field curvature with a value of about five microns through an entire field of view.
10. The device of claim 1 , wherein the aspheric epoxy surface is shaped to improve a periphery of a field of view instead of a center of an image.
11. A method of fabricating a camera device, comprising:
replicating epoxy from an aspheric mold on a first surface of a blue glass infrared cutoff filter, wherein a shape of the aspheric mold replicates the epoxy to have two convex portions with a valley between the two convex portions on only a front surface of the epoxy;
disposing a second surface of the blue glass infrared cutoff filter to have a direct physical contact with a sensor, the second surface opposite of the first surface;
attaching the sensor to a circuit board;
aligning a lens holder to the sensor; and
focusing at least one lens in a lens barrel,
wherein the camera device is configured to produce a modulation transfer function with a value greater than 0.4 for a field of view less than 35 degrees.
12. The method of claim 11 , further comprising affixing the blue glass infrared cutoff filter to the sensor.
13. The method of claim 11 , further comprising disposing the blue glass infrared cutoff filter inside the lens barrel.
14. The method of claim 11 , further comprising aligning the aspheric mold to the blue glass infrared cutoff filter.
15. The method of claim 11 , further comprising aligning the lens barrel to the sensor.
16. The method of claim 15 , wherein the aligning is within a tolerance of not more than 10 μm.
17. The method of claim 11 , further comprising disposing the blue glass infrared cutoff filter outside of the lens barrel.
18. The method of claim 11 , wherein the camera device is configured to produce a field curvature with a value of about five microns through an entire field of view.
19. The method of claim 11 , wherein the aspheric epoxy surface is shaped to improve a periphery of a field of view instead of a center of an image.