Photoelectric encoder

Details Photoelectric encoder Photoelectric encoder

2005-03-18

2009-08-04

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

Telecentric system

C250S216000

Reexamination Certificate

active

07570433

ABSTRACT:
A photoelectric encoder has a telecentric optical system in which a first lens and an aperture located at a focal position of the first lens are interposed between a main scale and a photoreceptor. At least a second lens is interposed between the aperture and the photoreceptor with a focus of the second lens on the aperture, thereby constituting a bilateral telecentric optical system. This makes it possible to improve the signal detection efficiency and increase the assembly tolerance.

REFERENCES:
patent: 3454777 (1969-07-01), Marcus
patent: 4051367 (1977-09-01), Sayce et al.
patent: 4799798 (1989-01-01), Erb
patent: 4948968 (1990-08-01), Matsui
patent: 4974962 (1990-12-01), Stephens et al.
patent: 5075562 (1991-12-01), Greivenkamp, Jr. et al.
patent: 5539519 (1996-07-01), Takagi et al.
patent: 5576537 (1996-11-01), Holzapfel
patent: 5583632 (1996-12-01), Haga
patent: 5751492 (1998-05-01), Meyers
patent: 5900983 (1999-05-01), Ford et al.
patent: 6393191 (2002-05-01), Chen
patent: 6617572 (2003-09-01), Ishizuka
patent: 6635863 (2003-10-01), Nihommori et al.
patent: 6856466 (2005-02-01), Tocci
patent: 7038776 (2006-05-01), Ansley et al.
patent: 2003/0209658 (2003-11-01), Iguchi et al.
patent: 2004/0173737 (2004-09-01), Shimomura et al.
patent: 2006/0202112 (2006-09-01), Mizutani
patent: 2007/0018084 (2007-01-01), Shimomura et al.
patent: 1 523 231 (1969-05-01), None
patent: 10226444 (2004-01-01), None
patent: 0926853 (1999-06-01), None
patent: 59-134006 (1984-09-01), None
patent: B-60-23282 (1985-06-01), None
patent: 62-200223 (1987-09-01), None
patent: 63250522 (1988-10-01), None
patent: A-1-57120 (1989-03-01), None
patent: B-2610624 (1997-02-01), None
patent: 2002-231604 (2002-08-01), None
patent: 2003-021787 (2003-01-01), None
patent: 2003-307440 (2003-10-01), None
Berger, C., “Design of Telecentric Imaging Systems for Noncontact Velocity Sensors,”Optical Engineering 4(10):2599-2606, Oct. 2002.
Chinese Office Action (English Translation) issued in Chinese Patent Application No. 2004-10045139.4, 4 pages.
Supplementary European Search Report dated Jan. 14, 2008, issued in corresponding Application No. EP 05721111.

Affiliated with

Also associated with

Rating

Photoelectric encoder does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Photoelectric encoder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelectric encoder will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4118666