Kam T Tam

US Patent:

50338420, Jul 23, 1991

Filed:

Feb 13, 1990

Appl. No.:

7/479377

Inventors:

Kam T. Tam - San Jose CA

International Classification:

G03B 2108
G03B 2130

US Classification:

353 66

Abstract:

An apparatus and method for projecting optical images from opaque or transparent objects onto a remote viewing screen includes a plane mirror combination and a reflective projection means. The plane mirror combination comprises an image inverting plane mirror and an image reversing plane mirror. The image inverting plane mirror is positioned angularly over the illuminated object and converts the upright and nonreversed object image into an inverted and reversed image. Disposed close by the image inverting plane mirror is the reflective projection means which comprises a parabolic concave mirror the parabolic concave mirror captures the inverted and reversed image and projects it onto the image reversing plane mirror near by as an enlarged, upright and reversed image. In return, the image reversing plane mirror reflects the enlarged, upright and reversed image onto the remote viewing screen as an enlarged, upright and nonreversed real image. The apparatus and method is convenient to operate and with the objects to be projected accessible to the operator but without the irritation of stray light glares affecting the operator's eyesight.

US Patent:

50776754, Dec 31, 1991

Filed:

Oct 4, 1989

Appl. No.:

7/416866

Inventors:

Kam T. Tam - San Jose CA

Assignee:

Amdahl Corporation - Sunnyvale CA

International Classification:

H02H 720

US Classification:

364480

Abstract:

A power sequencer for connecting a system to an electrical power supply without powering down the system and without damage to the system or the power supply. A plurality of sequentially engageable contacts are coupled to the power supply for receiving power signals. The contacts are spatially positioned to toggle in a predetermined sequence during engagement. A controller is coupled to the contacts, for supplying a terminal signal to the load in response to the predetermined sequence of toggling of the contacts and in response to the power signals. The controller has a control circuit for generating a control signal which varies in response to the sequence, and a regulator, coupled to the control circuit, for regulating the terminal signal in response to the control signal.

US Patent:

49782177, Dec 18, 1990

Filed:

Feb 20, 1990

Appl. No.:

7/482225

Inventors:

Kam T. Tam - Santa Clara CA

International Classification:

G01B 2128

US Classification:

353119

Abstract:

An apparatus and method for projecting optical images from electronic devices with luminous screens such as television receivers or computer terminal displays includes an image inversion means and a reflective projection means. The image inversion means comprises an assembly of two normally intersecting plane mirrors disposed close by the luminous screen. Object images from the luminous screen enter into one of the mirrors of the image inversion means as an upright and nonreversed image and are reflected by the other plane mirror out of the image inversion means as an inverted and nonreversed image. The reflective projection means comprises a parabolic concave mirror, positioned close by the image inversion means, and which captures the inverted and nonreversed image and projects it into a remote viewing screen as an enlarged, upright and nonreversed real image. The apparatus and method is designed to be adaptable to luminous screens of various sizes and capable of projecting high quality images without resorting to any alterations of electronics or complicated optics.