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Medical DR lens

This lens series is high precision lenses used for converting image from an CsI screen in x-ray image intensifier, to a big format CCD for diagnosis of diseases. These lenses are used by some of the biggest Fortune 500 companies in the world. The specification of lenses are as below:

Focal length	58.8mm
F #	0.93
Object distance	760mm
Object size	470x470mm
Image size	36.8x36.8mm
Work wavelength	480, 550, 615nm
Image quality	MTF>0.45@56lp/mm on axis
Image quality	MTF>0.3@56lp/mm over entire field of view
Distortion	-1.98%
Conjugate distance	920mm from object to image
Back focal length	6mm

These lenses are used mainly for projecting plane objects at limited distance to CCD chip. Due to the high performance required, design of these lenses is quite sophisticated. They are all based on the principle of double Gaussian system with short focal length and large relative aperture. Tolerances of the lens are so strict that are hardly achieved by ordinary technology. A linear variable iris is provided between the lenses, which can be operated by a motor driven by signals from a sensor.

Endoscope for laryngoscopy

Focal length	2.15m

Object distance	37mm

Image size	Φ3mm

Image quality	MTF>30%@150lp/mm

Conjugate distance	About 50mm

Application	Endoscope applied to laryngoscopy

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