Positive aspects of an Optical Encoder
Optical encoders function similar to a rotary encoder, but has an electromechanical device that uses a sensor to identify position change as light passes through.
(firmenpresse) - The optical zoom function on cell phone cameras avoids the degradation in excellent brought on by digital zoom, but present implementations usually be noisy, bulky, and power hungry.
Introduction
A wide selection of commercial applications use cameras having a zooming mechanism. Perhaps probably the most ubiquitous application is the camera phone. Essential design criteria for camera zooming include low-power consumption and, naturally, space constraints. This article describes an optical encoder technology that delivers a new approach to camera zooming designs to meet these challenges.
Optical and digital zoom
Camera phones may perhaps have an optical zoom, a digital zoom, or each. An optical zoom modifications the productive focal length from the camera lens such that the original image is magnified and can be captured by the CCD or CMOS image sensor. With greater magnification, the light is spread across the whole image sensor and all of the pixels is often used. An optical zoom could be interpreted as a true zoom that can strengthen the quality of photos captured.
Digital zoom, around the other hand, is really a bit various. Within this case, a software algorithm is applied instead of a hardware movement (i.e., adjustments in lens positioning) to magnify the image. Such magnification involves only a certain portion of the captured image. This is generally known as the interpolation method. Using such a strategy, or algorithm, needs data to become added as a way to enlarge the corresponding image portion. It may seem that the captured image is becoming magnified. Nonetheless, only a certain portion on the real image information and facts is being utilized and also the rest on the image is coming in the interpolation outputs.
One factor worth mentioning is that the larger the digital zoom, the smaller sized the portion of real facts that is definitely taken. For that reason, quite a few on the originally captured pieces of facts around the image sensor are going to be discarded and much more interpolated image data might be incorporated inside the resultant image.
Consequently, optical zooming is an crucial mechanism in figuring out the true zooming power of a camera phone with out losing any image data. Precise lens positioning control in optical zoom is important to ensuring top quality in an enlarged image. Figure 1 illustrates a standard instance of the zooming mechanism from a camera module inside a camera phone. Lenses are aligned such that an image might be focused onto the image sensor. The zooming mechanism involves synchronous movement of two or far more lenses. By varying the distance involving the lenses, the actual efficient focal length of your camera lens alterations accordingly. Therefore, a magnified image will be captured by an image sensor.
To simplify the wiring process, encoders are mounted on the camera module shell and stay within a fixed position. The moving portion could be the codestrip, which acts because the translator for the lens' linear movement. Casting the window and bar image back for the encoder gives feedback on each of the necessary data for prompt and precise lens positioning. With a standard zooming mechanism, a combination of mechanical cam and gearing can be a common method for lens position control. Having said that, such an method will suffer unavoidable put on and tear troubles, plus the accuracy of lens positioning will degrade more than time and directly influence for the high quality of zoomed photos.
An AEDR-8400 encoder Technologies will help to resolve these zooming troubles. The feedback from the encoder provides required details for real-time calibration anytime there's any back-lashing from gears and mechanical cams. This could enable ensure precise and accurate lens positioning. Furthermore, in some customized camera module designs, removing the mechanical cam is achievable (see Figure 2).
Incorporating the AEDR-8400 encoder into a piezo-actuator camera module, for example, can essentially get rid of the usage of mechanical cams. And, mainly because there is certainly no mechanical cam involvement, there is no fixed zooming position along with the new camera module system can utilize a continuous zooming function (see Figure 3).
With regards to power consumption, piezo-actuator systems often consume less power in comparison with voice coil and servo solutions. Also, a piezo-actuator solution could aid hold the noise and vibration level to a minimum, which a stepper motor or voice coil solution can not obtain.
The reflected images of the window and bar are focused on the photodiodes. As the codestrip moves, an alternating pattern of light and shadow cast by the window and bar, respectively, falls upon the photodiodes. The detector IC converts this pattern into digital, TTL-compatible outputs representing the codestrip linear motion and therefore, the lens' movements. A vital parameter is resolution, that is defined as the density of window/bar in a unit distance and is usually defined as lines per inch or lines per millimeter. Larger resolution indicates finer control of your linear motion.
The AEDR-8400 encoder is made in order that the LED and detector IC in the encoder need to be placed parallel to the window/bar orientation. As such, the encoder is robust against radial play. This notion is illustrated in Figure 5.
The all round camera module design could be shrunk in comparison with a stepper motor solution or perhaps a voice coil solution. The motor size is comparable to the piezo-actuator. On the other hand, the removal of mechanical cams and gearing enables the general camera module dimension to become decreased further to meet current marketplace demands.
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