Eric G Lean

Author:

Eric G. Lean

ISBN #:

0819410160

Author:

Eric G. Lean

ISBN #:

0819422932

US Patent:

43298761, May 18, 1982

Filed:

Jun 3, 1980

Appl. No.:

6/156226

Inventors:

Wen-Hsien Chen - Ta-hsi, TW
Eric G. Lean - Chappaqua NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G01N 2904

US Classification:

73618

Abstract:

Electronically focused and automatically scanning acoustic bulk waves are produced by scattering chirp acoustic bulk waves at grazing incidence from an acoustic grating. The same apparatus may be used in reverse to convert diverging acoustic bulk waves produced by a focused beam into chirp acoustic bulk waves. A pulse compression filter then converts the chirp waves into signals describing the source.

US Patent:

40841898, Apr 11, 1978

Filed:

Dec 29, 1975

Appl. No.:

5/645109

Inventors:

Eric Gung-Hwa Lean - Mahopac NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04N 314

US Classification:

358213

Abstract:

A thin film optical scanner using phonon echoes. A piezoelectric (an insulator or a semiconductor) crystal has deposited thereon a photoconductor. An acoustic transducer propagates a broad strain wave pulse guided in or on the crystal. A relatively shorter electric field pulse is coupled to the piezoelectric crystal through the photoconductor which has an optical signal focused thereon. The interaction of electric field and strain wave produce a backward travelling acoustic wave which is modulated by the optical signal.

US Patent:

45964793, Jun 24, 1986

Filed:

May 15, 1985

Appl. No.:

6/734746

Inventors:

Eric G. Lean - Chappaqua NY
Keith S. Pennington - Somers NY
Samuel C. Tseng - Pleasantville NY
Han C. Wang - Chappaqua NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

B41J 310

US Classification:

400121

Abstract:

The present invention relates to a dot matrix printer which makes use of multiple dot patterns distributed on the cylinder, belt, hand or drum of a line printer to provide an improved printing throughput for an all addressable line printer. In a dot-helix matrix printer, different arrangements of the dots are used which can be varied in position and spacing to increase printing speed. On a belt, band or drum line printer, multiple dot patterns are given a predetermined distribution. More specifically, arrangements of dots are used which provide enhanced performance due to the fact that they are determined by an analysis of the statistical occurrence of a particular dot pattern in a character set. The higher statistical probability dot patterns are used more often on the belt, band or drum.

US Patent:

39945596, Nov 30, 1976

Filed:

Dec 22, 1975

Appl. No.:

5/642861

Inventors:

John David Crow - Mohegan Lake NY
Eric Gung-Hwa Lean - Mahopac NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G02B 514

US Classification:

350 96C

Abstract:

An optical structure for the bidirectional coupling of light between each of a multiplicity of optical fibers and corresponding individual thin-film waveguides to achieve a leaky wave coupling from one guided mode structure to a second guided mode structure. The structure is particularly suited for fabrication by planar deposition and etching techniques and features the precise axial alignment of the optical elements by inserting the fibers in etched V-grooves in the substrate upon which are deposited the waveguides.

US Patent:

41562062, May 22, 1979

Filed:

Dec 30, 1976

Appl. No.:

5/756043

Inventors:

Liam D. Comerford - Croton-on-Hudson NY
Robert A. Laff - Yorktown Heights NY
Eric G. Lean - Mahopac NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H01S 305

US Classification:

331 945C

Abstract:

A semiconductor laser and optical waveguide are coupled together along a common optical axis and bounded at remote ends with reflective surfaces to form an optical resonant cavity. A periodic grating formed in a side surface of the optical waveguide directs some radiant energy out of the cavity in a direction not parallel with the common optical axis.

US Patent:

40794040, Mar 14, 1978

Filed:

Dec 30, 1976

Appl. No.:

5/756042

Inventors:

Liam David Comerford - Croton-on-Hudson NY
John David Crow - Mohegan Lake NY
Robert Allan Laff - Yorktown Heights NY
Eric Gung-Hwa Lean - Mahopac NY
Michael John Brady - Brewster NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H01L 3112
G02B 514

US Classification:

357 19

Abstract:

An optical assembly structure wherein miniature optical components such as lasers, modulators, lenses, thin-film and fiber-optic waveguides, and photodetectors are critically aligned and supported for coactive operation by means of two or more wafers which are formed with complementary grooves and mortises to support the loose optical components such as lenses and fiber-optic waveguides and to receive alignment rails to insure the relativity of the wafers, which also have formed integral therewith optical elements such as waveguides, modulators, and lasers, to produce an integrated optical assembly somewhat in the manner of an "optical bench," wherein the bench structure also provides an active optical element.

US Patent:

40841910, Apr 11, 1978

Filed:

Dec 20, 1976

Appl. No.:

5/752758

Inventors:

Eric Gung-Hwa Lean - Mahopac NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

H04N 312
H03H 900

US Classification:

358213

Abstract:

A scanning apparatus for converting an optical line image to a serial electrical analog signal by launching an acoustic wave in a plurality of ridged waveguides each of a different length. In one embodiment the launching transducer includes an electro-optical layer which modulates the acoustic wave as a function of the incident light intensity. In a second embodiment the acoustic wave is launched in each waveguide with the same amplitude but interacts with an acousto-optical overlay on the waveguide to amplitude modulate the intensity of the propagating acoustic wave. The thus generated and modulated acoustic waves are converted to electrical signals either by reflection back to the launching transducer or by individual transducers on each channel. The differing lengths converts the parallel image to a series electrical signal.

US Patent:

50219065, Jun 4, 1991

Filed:

Oct 31, 1989

Appl. No.:

7/429890

Inventors:

Shuo H. Chang - Briarcliff Manor NY
Ferdinand Hendriks - Yorktown Heights NY
Vijayeshwar D. Khanna - Ossining NY
Eric G. Lean - Chappaqua NY

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G11B 560

US Classification:

360103

Abstract:

An air bearing slider according to the present invention provides a programmable slider wherein the fly height of the read/write head may be conveniently controlled using electrical signals. In an air bearing slider according to the present invention, the rear of the slider is made to fly lower by altering the angle of attack of a rear air bearing region. In one embodiment of the present invention, a slider configuration includes a first air bearing region at the leading edge of the slider and a second air bearing region at the slider's trailing edge. The first air bearing region includes a tapered region. A deformable central region, including a non air bearing surface, joins the first and second air bearing regions and controls the relative angle between the air bearing surfaces. The relative angle is adjusted by deforming the central region using a layer of piezoelectric material which overlays the central region. A conventional read/write head is placed on the rear portion of the second air bearing region.