ImageMaster^® Production Line

High Speed Production MTF-Tester Leadership in testing mobile phone and digital camera lenses

Since the first developments on miniature mobile phone lenses in the year 2000 TRIOPTICS is in close cooperation with the leading manufacturers in this business. Due to the longterm experience and the high quality standards, TRIOPTICS has become the world wide market leader for MTF production testers.

ImageMaster^® PRO 5, the latest development for MTF-production testing, is the leading instrument for testing mobile phone and digital camera lenses. It is recognized as the industry standard providing highest accuracy and reliability. The calibration of the instrument is directly traceable to international standards.

Ultra-fast measurement of high volume quantities

The ImageMaster^® PRO line family of instruments has been developed for the fast inspection of the imaging quality (in terms of MTF) of objective lenses in high volume production lines, especially for the mobile phone lens market, but also for digital compact camera lenses. Hence, these instruments are optimized for smaller samples with shorter effective focal lengths.

The ImageMaster^® PRO 5measures the sample EFL and the on- and off-axis MTF within less than 2 seconds per lens including the lens positioning and autofocus procedure. Of course, for each image field position both the tangential and the sagittal MTF is measured.

ImageMaster^® PRO 5 - Ultra-fast for production testing

ImageMaster^® PRO 5 Wafer

Quality, long life and reliability

Typically, ImageMaster^® PRO 5 equipment is used in the quality assurance where 100% testing is required. The oversized build and high quality components guarantee highest MTBF (mean time between failures) even at 24hours operation. The measurement is based on state of the art image analysis and MTF evaluation according to the ISO 9334/5 standard giving objective and repeatable results. Besides numerous mechanical features for fully automatic measurements also the software has been adapted to the requirements in high volume production lines. The simple but effective user interface and program layout makes it an indispensable tool for the final inspection of objective lenses.

Measurement principle

The measurement principle is based on the reverse projection method which TRIOPTICS has successfully introduced into the market of MTF production testers and used since then. The test target is an illuminated reticle which carries crosshair type test patterns of a few microns line width and sub-micron lithographic accuracy. It typically has the size of the sensor in the sample lens application. The test patterns are at defined field locations according to the customer's specification.

The target reticle is moved by a precision autofocus stage to the focal plane of the sample lens, so that the test pattern is projected to infinity. For each field angle there is a dedicated CCD telescope which images a magnified image of the test pattern to the CCD sensor. Typically 5 or 9 image field locations are analyzed thus an according number of camera images is simultaneously grabbed and transferred to the PC.

This setup significantly reduces the total measurement time compared to traditional MTF testers thanks to the common test target and dedicated CCD telescopes for all measured image field positions. Today, ImageMaster^® PRO 5 instruments are installed and in operation for objective lens resolutions ranging from CIF and VGA up to 8 megapixels and spatial frequencies up to 300 lp/mm. The instrument allows the measurement of high distortion wide-angle objective lenses with a field of view (FOV) >165.

The ImageMaster^® Production line includes four different instrument types:

ImageMaster^® PRO 5

ImageMaster^® PRO 5 Wafer

ImageMaster^® SMART PRO 5

ImageMaster^® Compact PRO