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Optical system including lenses and prism for telephoto cameras | [
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An optical system for a camera may include a lens group having a plurality of lenses, a prism, and an image sensor. The prism may be positioned, optically, between the plurality of lenses and the image sensor along the optical transmitting path of the light. The prism may include at least four surfaces, which may fold the light within the prism at least four times to guide the light from the plurality of lenses passing through the prism to the image sensor. The prism may include multiple prisms joined together using an optical cement. The prism may include one or more aperture masks inside the prism to reduce flare. | [
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What is claimed is:
1. A camera, comprising:
a plurality of lenses;
an image sensor; and
a prism configured to:
transmit light passing through the plurality of lenses through a first surface into the prism, wherein the first surface provides an initial transmission surface of the prism to receive the light passing through the plurality of lenses from a subject to be imaged at the image sensor;
reflect, at a second surface of the prism, at least some of the light passing through the first surface of the prism, wherein an angle between the first surface and the second surface of the prism is in a range between 25 and 35 degrees;
reflect, at the first surface of the prism, at least some of the light reflected from the second surface of the prism;
reflect, at a third | [
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m, at least some of the light reflected from the second surface of the prism;
reflect, at a third surface of the prism, at least some of the light reflected from the first surface of the prism; and
reflect, at a fourth surface of the prism, at least some of the light reflected from the third surface of the prism to pass through the third surface out of the prism to the image sensor, such that at least some of the light transmitted through the first surface and reflected within the prism at the second surface, the first surface, the third surface, and the fourth surface reaches the image sensor to image the subject.
2. The camera of claim 1 , wherein at least one of the second surface or the fourth surface of the prism includes a reflective coating.
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of the second surface or the fourth surface of the prism includes a reflective coating.
3. The camera of claim 1 , wherein at least one of the first surface or third surface of the prism includes an anti-reflective coating.
4. The camera of claim 1 , wherein the plurality of lenses includes at least one of a glass lens or a plastic lens.
5. The camera of claim 1 , wherein individual ones of the plurality of lenses is a spherical lens.
6. The camera of claim 1 , wherein a ratio B/A is in a range between 0.2 and 0.6, wherein B represents a partial Z-height of the camera between the first surface of the prism and an image plane of the image sensor, and A represents a total Z-height of the camera between a fron | [
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d an image plane of the image sensor, and A represents a total Z-height of the camera between a front surface of a first lens of the plurality of lenses and the image plane of the image sensor.
7. The camera of claim 6 , wherein the partial Z-height of the camera is in a range between 3.57 and 5.6 millimeters.
8. The camera of claim 1 , wherein a product CD is in a range between 0.6 and 1.0, wherein C represents an optical path length of light in the prism from the light entering the prism to exiting the prism, and D represents a power of the plurality of lenses.
9. The camera of claim 1 , wherein an effective focal path of the camera is in a range of 17.2 and 27.2 millimeters.
10. The camera of claim 1 , w | [
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amera is in a range of 17.2 and 27.2 millimeters.
10. The camera of claim 1 , wherein a ratio E/F is in a range between 0.2 and 0.8, wherein E represents a thickness of the prism between the first surface and the third surface of the prism and F represents a thickness of the plurality of lenses between a front surface of a first lens and a rear surface of a last lens of the plurality of lenses.
11. The camera of claim 1 , wherein the prism includes a parallelogram prism, and wherein the first surface of the prism is parallel to the third surface of the prism and the second surface of the prism is parallel to the fourth surface of the prism.
12. The camera of claim 1 , wherein the prism includes a plurality of prisms joined toge | [
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12. The camera of claim 1 , wherein the prism includes a plurality of prisms joined together using an optical cement.
13. The camera of claim 12 , wherein the prism includes one or more aperture masks inside the prism configured to reduce flare.
14. The camera of claim 1 , wherein the prism comprises two aperture masks at different locations inside the prism, configured to reduce flare.
15. The camera of claim 14 , wherein the two aperture masks are positioned at respective joining surfaces between a rectangular prism and respective triangular prisms at opposite ends of the rectangular prism.
16. A device, comprising:
one or more cameras; and
one or more processors configured to process image | [
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device, comprising:
one or more cameras; and
one or more processors configured to process image signals generated from the one or more cameras,
wherein at least one of the one or more cameras includes:
a plurality of lenses;
an image sensor; and
a prism configured to:
transmit light passing through the plurality of lenses through a first surface into the prism, wherein the first surface provides an initial transmission surface of the prism to receive the light passing through the plurality of lenses from a subject to be imaged at the image sensor;
reflect, at a second surface of the prism, at least some of the light passing through the first surface of the prism, wherein an angle between the first surface and the second surface of the prism is in a range between 25 and 35 deg | [
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le between the first surface and the second surface of the prism is in a range between 25 and 35 degrees;
reflect, at the first surface of the prism, at least some of the light reflected from the second surface of the prism;
reflect, at a third surface of the prism, at least some of the light reflected from the first surface of the prism; and
reflect, at a fourth surface of the prism, at least some of the light reflected from the third surface of the prism to pass through the third surface out of the prism to the image sensor, such that at least some of the light transmitted through the first surface and reflected within the prism at the second surface, the first surface, the third surface, and the fourth surface reaches the image sensor to image the subject.
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face, and the fourth surface reaches the image sensor to image the subject.
17. The device of claim 16 , wherein at least one of the second surface or the fourth surface of the prism includes a reflective coating.
18. The device of claim 16 , wherein an F-number of the at least one camera is in a range between 2.2 and 2.8, and wherein an effective focal length of the at least one camera is in a range between 17.2 and 27.2 millimeters.
19. The device of claim 16 , wherein the prism includes a parallelogram prism, wherein the first surface of the prism is parallel to the third surface of the prism and the second surface of the prism is parallel to the fourth surface of the prism.
20. An optical system, c | [
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e prism is parallel to the fourth surface of the prism.
20. An optical system, comprising:
a plurality of lenses; and
a prism having at least four surfaces, wherein the prism is configured to:
transmit light passing through the plurality of lenses through a first surface into the prism, wherein the first surface provides an initial transmission surface of the prism to receive the light passing through the plurality of lenses from a subject to be imaged at an image plane;
reflect, at a second surface of the prism, at least some of the light passing through the first surface of the prism, wherein an angle between the first surface and the second surface of the prism is in a range between 25 and 35 degrees;
reflect, at the first surface of the prism, at least some | [
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reflect, at the first surface of the prism, at least some of the light reflected from the second surface of the prism;
reflect, at a third surface of the prism, at least some of the light reflected from the first surface of the prism; and
reflect, at a fourth surface of the prism, at least some of the light reflected from the third surface of the prism to pass through the third surface out of the prism to an image plane, such that at least some of the light transmitted through the first surface and reflected within the prism at the second surface, the first surface, the third surface, and the fourth surface reaches the image plane to image the subject. | [
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This application is a continuation of U.S. patent application Ser. No. 17/481,213, filed Sep. 21, 2021, which claims benefit of priority to U.S. Provisional Application Ser. No. 63/083,038, entitled “Optical System for Telephoto Cameras,” filed Sep. 24, 2020, and which are hereby incorporated herein by reference in their entirety.
BACKGROUND
Technical Field
This disclosure relates generally to cameras and more specifically to optical systems for small form factor cameras.
Description of the Related Art
Telephoto cameras generally have relatively long focal lengths and are great for capturing scenes and subject at a far distance. However, the advent of small, mobile multipurpose devices such as smartphones, tablet, pad, or wearable devices has created a need for high-resolution, small form factor cameras for integration in the devices. Therefore, it is desirable to have an optical system suitable for small form factor, high-quality telephoto camer | [
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a need for high-resolution, small form factor cameras for integration in the devices. Therefore, it is desirable to have an optical system suitable for small form factor, high-quality telephoto cameras.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows an example optical system, according to some embodiments.
FIG. 2 A shows example values of some parameters for an optical system, according to some embodiments.
FIG. 2 B shows example values of some additional parameters for an optical system, according to some embodiments.
FIGS. 3 A- 3 C show an example prism including aperture masks, according to some embodiments.
FIGS. 4 A- 4 H show example design variations for an optical system, according to some embodiments.
FIG. 5 shows example values of some parameters for some example optical systems, according to some embodiments.
FIGS. 6 A- 6 H show example values of some additional pa | [
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ents.
FIG. 5 shows example values of some parameters for some example optical systems, according to some embodiments.
FIGS. 6 A- 6 H show example values of some additional parameters for some example optical systems, according to some embodiments.
FIG. 7 shows a high-level flowchart of method for capturing images using a camera including an optical system, according to some embodiments.
FIG. 8 shows a high-level flowchart of an example method for creating an optical system, according to some embodiments.
FIG. 9 illustrates a schematic representation of an example device that may include a camera having an optical system, according to some embodiments.
FIG. 10 illustrates a schematic block diagram of an example computer system that may include a camera having an optical system, according to some embodiments.
This specification includes references to “one embodiment” or “an embodiment. | [
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e computer system that may include a camera having an optical system, according to some embodiments.
This specification includes references to “one embodiment” or “an embodiment.” The appearances of the phrases “in one embodiment” or “in an embodiment” do not necessarily refer to the same embodiment. Particular features, structures, or characteristics may be combined in any suitable manner consistent with this disclosure.
“Comprising.” This term is open-ended. As used in the appended claims, this term does not foreclose additional structure or steps. Consider a claim that recites: “An apparatus comprising one or more processor units . . . .” Such a claim does not foreclose the apparatus from including additional components (e.g., a network interface unit, graphics circuitry, etc.).
“Configured To.” Various units, circuits, or other components may be described or claimed as “configured to” perform a task or tasks. In such contexts, “configured to” is us | [
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cs circuitry, etc.).
“Configured To.” Various units, circuits, or other components may be described or claimed as “configured to” perform a task or tasks. In such contexts, “configured to” is used to connote structure by indicating that the units/circuits/components include structure (e.g., circuitry) that performs those task or tasks during operation. As such, the unit/circuit/component can be said to be configured to perform the task even when the specified unit/circuit/component is not currently operational (e.g., is not on). The units/circuits/components used with the “configured to” language include hardware—for example, circuits, memory storing program instructions executable to implement the operation, etc. Reciting that a unit/circuit/component is “configured to” perform one or more tasks is expressly intended not to invoke 35 U.S.C. § 112(f) for that unit/circuit/component. Additionally, “configured to” can include generic structure (e.g., generic circuitry) that is mani | [
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End of preview. Expand in Data Studio
Apple patent embeddings for https://docs.sutro.sh/examples/large-scale-embeddings
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