Optical displacement detecting apparatus having gratings and a l

Details Optical displacement detecting apparatus having gratings and a l Optical displacement detecting apparatus having gratings and a l

1997-10-27

1998-11-24

Le, Que

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, 250237G, 356373, G01D 534

Patent

active

058411330

ABSTRACT:
An optical encoder is disclosed, that comprises a main scale 1, a light radiating means 2, and a second member 3. The main scale 1 is a first member having an optical grating 12. The light radiating means 2 radiates collimated light to the main scale 1. The second member 3 detects variations of bright images and dark images corresponding to the relative movement between the main scale 1 and the second member 3. The second member 3 comprises a glass substrate 4 and a light receiving IC chip 5. The glass substrate 4 has thin film electrodes. The light receiving IC chip 5 has a light receiving device array 51 that is in common with an index grating, is disposed on a reverse surface of the glass substrate through solder bumps 54 by face-down bonding method. A transparent resin for sealing the front surface of the light receiving IC chip is filled in a gap between the IC chip 5 and the glass substrate 4.

REFERENCES:
patent: 5283434 (1994-02-01), Ishizuka et al.

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