Optical apparatus

Details Optical apparatus Optical apparatus

1998-08-13

1999-11-16

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359204, 359217, 359218, 359219, G02B 2608

Patent

active

059867930

ABSTRACT:
An optical apparatus has a holder which integrally holds a light source for emitting a divergent beam, and a finite focus lens (or a collimator lens) for converting the divergent beam to a convergent one (or a parallel one). The holder is made of a material having a linear expansion coefficient which can cause change of the distance between the light source and the finite focus lens so as to correct a change in the focal distance of the lens. When there is a change in temperature, the holder changes the distance between the light source and the finite focus lens by an amount corresponding to the change in temperature, thereby correcting that shift in the image forming position of the finite focus lens, which is caused by the change in temperature.

REFERENCES:
patent: 4720168 (1988-01-01), Kaneko
patent: 4815059 (1989-03-01), Nakayama et al.
patent: 5124830 (1992-06-01), Omura et al.
patent: 5673136 (1997-09-01), Inoue et al.

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