Imaging lens for reading out image

Details Imaging lens for reading out image Imaging lens for reading out image

1996-12-30

1998-06-16

Font, Frank G.

Optical: systems and elements

Single channel simultaneously to or from plural channels

359639, 359621, G02B 2710

Patent

active

057680213

ABSTRACT:
The temperature coefficient of refractive index in each lens constituting an imaging lens is controlled such that the amount of change in the imaging position due to change in the imaging lens upon temperature alleviates the positional deviation between the imaging position and the light-receiving surface caused by members other than the imaging lens, thereby preventing the read-out accuracy from deteriorating. The amount of change in the imaging position caused by change in the refractive index of lenses upon change in temperature is adjusted so as to alleviate the positional deviation between the imaging position and light-receiving surface due to the thermal expansion of the member unitedly holding the light source, lenses, and receiving optics.

REFERENCES:
patent: 5329363 (1994-07-01), Moskovich
patent: 5555133 (1996-09-01), Tanaka

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