US3768384A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Projection assembly
Assignee: Xerox Corp
•
Filing: 1972-09-29
•
Granted: 1973-10-30
•
Expires: 1992-09-29
Abstract
Abstract A recording system wherein a character disc or the like having transparent light modulating patterns thereon is rotated through an exposure zone so that selected patterns may be projected by the energization of a flash lamp. The projected pattern is collimated and directed to a recording zone through which move lens-mirror units at a constant speed that intercept the projected pattern and focus it onto a photoreceptive recording medium. The patterns are arranged on the character disc in spiralled configurations such that as the disc is rotated the first and last patterns of a spiral move through a fixed exposure zone at different positions relative thereto. A plurality of concentric pattern sets along with a corresponding plurality of flash lamps allows for the simultaneous projection of a plurality of lines.
Inventors
- 👤 L Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:06
CPC Classifications
B; B41; B41B; B41B17/00; B41B17/04; B41B17/10; B41B21/00; B41B21/16; B41B27/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
147 words
Character projection apparatus comprising a character disc having a plurality of pattern areas arranged in concentric spiral configurations relative to the center of said character disc, each pattern area including a set of uniformly spaced and sized opaque character spaces each having centered therein a transparent alphanumeric character shaped area, a corresponding plurality of selectively flashable light sources disposed adjacent one surface of said disc, means adjacent the opposite surface of said disc for collimating illumination passing through said disc, means for focusing said collimated illumination to project said characters of said disc onto a light responsive recording medium, and means for moving the first character space of each of said pattern areas past a corresponding light source at a first fixed position relative thereto and the last character of said each pattern area past said corresponding light source in a second position contiguous said first position.
Claim 2
Dependent Claim
147 words
Character projection apparatus comprising a character disc having a plurality of pattern areas arranged in concentric spiral configurations relative to the center of said character disc, each pattern area including a set of uniformly spaced and sized opaque character spaces each having centered therein a transparent alphanumeric character shaped area, a corresponding plurality of selectively flashable light sources disposed adjacent one surface of said disc, means adjacent the opposite surface of said disc for collimating illumination passing through said disc, means for focusing said collimated illumination to project said characters of said disc onto a light responsive recording medium, and means for moving the first character space of each of said pattern areas past a corresponding light source at a first fixed position relative thereto and the last character of said each pattern area past said corresponding light source in a second position contiguous said first position.
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 further including a stationary aperture for preventing projection of more than one character at a time from each of said pattern areas.
Claim 4
Dependent Claim
59 words
The apparatus of claim 2 wherein the radius of each of said spiral configurations relative to the axis of said disc is equal to Ro + K theta , where Ro is the shortest radius of said each configuration, K is a constant, and theta is the angle subtended by the radius of said each spiral configuration and Ro.
Claim 5
Dependent Claim
62 words
The apparatus of claim 3 wherein each of said pattern areas includes a fixed number of character sets arranged seriatim around the center of said character disc, each of said fixed number of character sets within said each pattern area being in a spiral condiguration having common shortest and longest radii and the character sets of different pattern areas being radially aligned.
References Cited (Backward Citations)
US3252392A
Cited
US3517591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |