US3678820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system for projection recording apparatus
Assignee: Xerox Corp
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Filing: 1970-11-19
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Granted: 1972-07-25
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Expires: 1990-11-19
Abstract
Abstract An alphanumeric recording system wherein a character disc having transparent character images thereon is rotated through an exposure zone so that selected characters may be projected by the energization of a flash lamp. The projected image is collimated and directed to a recording zone through which move lens-mirror units at a constant speed to intercept the projected image and focus it onto a photoreceptive recording medium. The character disc rotates at a rate such that with the slits therein associated with respective characters inter-character spacing is assured. Dead time in the recording process is eliminated by the use of the collimated projected character image and plural interception of that image.
Inventors
- 👤 Philip L Chen
- 👤 Louis F Paradysz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:31
CPC Classifications
B; B41; B41B; B41B27/00; B41B27/28; B41B17/00; B41B17/04; B41B17/10; B41B21/00; B41B21/16; G; G06; G06K; G06K15/00; G06K15/02; G06K15/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
196 words
An optical system for a recording apparatus employing a light responsive recording medium in a recording zone wherein a light modulating area in An opaque member intercepts light from a projection flash lamp at an exposure zone comprising: a. optical means for collimating light passing through said area; b. a drive member; c. means for driving said drive member at a constant speed through said recording zone and substantially parallel to said recording medium; d. two lenses each attached to said drive member and positioned at some time during the movement of said drive member relative to said collimated light to intercept simultaneously different portions thereof, said lenses being spaced apart on said drive member by a distance equal to the dimension of said recording zone in the direction of movement of said lenses therethrough; e. two optical means, each associated respectively with one of said lenses, for directing the light passing through said lenses onto said recording medium, the length of the path travelled by the light passing through any one of said lenses to said recording surface via a respective one of said two optical means substantially equalling the focal length of said lenses.
Claim 2
Dependent Claim
196 words
An optical system for a recording apparatus employing a light responsive recording medium in a recording zone wherein a light modulating area in An opaque member intercepts light from a projection flash lamp at an exposure zone comprising: a. optical means for collimating light passing through said area; b. a drive member; c. means for driving said drive member at a constant speed through said recording zone and substantially parallel to said recording medium; d. two lenses each attached to said drive member and positioned at some time during the movement of said drive member relative to said collimated light to intercept simultaneously different portions thereof, said lenses being spaced apart on said drive member by a distance equal to the dimension of said recording zone in the direction of movement of said lenses therethrough; e. two optical means, each associated respectively with one of said lenses, for directing the light passing through said lenses onto said recording medium, the length of the path travelled by the light passing through any one of said lenses to said recording surface via a respective one of said two optical means substantially equalling the focal length of said lenses.
Claim 3
Dependent Claim
29 words
An optical system as defined in claim 1 wherein said two optical means are mirrors, each one of which is fixed relative to a respective one of said lenses.
Claim 4
Dependent Claim
171 words
An optical system for recording apparatus employing a light responsive recording medium in a recording zone wherein light modulating patterns in an opaque member intercept light from a projection flash lamp at an exposure zone comprising: a. collimating means for collimating the light passing through said patterns; b. two lenses spaced apart by a predetermined distance and positioned relative to said collimating means to simultaneously intercept different portions of said collimated light, one of said lens being in said recording zone; c. motive means for repeatedly moving said lenses through said recording zone in a predetermined direction; d. said predetermined distance being equal to the dimension of said recording zone in said predetermined direction; and e. two mirrors, each fixed relative to a respective one of said lenses and aligned therewith to direct said different portions toward said recording medium, the distance from one of said lenses to its respective mirror and from said respective mirror to said recording medium combining to be equal to the focal length of said lens.
Claim 5
Dependent Claim
171 words
An optical system for recording apparatus employing a light responsive recording medium in a recording zone wherein light modulating patterns in an opaque member intercept light from a projection flash lamp at an exposure zone comprising: a. collimating means for collimating the light passing through said patterns; b. two lenses spaced apart by a predetermined distance and positioned relative to said collimating means to simultaneously intercept different portions of said collimated light, one of said lens being in said recording zone; c. motive means for repeatedly moving said lenses through said recording zone in a predetermined direction; d. said predetermined distance being equal to the dimension of said recording zone in said predetermined direction; and e. two mirrors, each fixed relative to a respective one of said lenses and aligned therewith to direct said different portions toward said recording medium, the distance from one of said lenses to its respective mirror and from said respective mirror to said recording medium combining to be equal to the focal length of said lens.
References Cited (Backward Citations)
US1893158A
Cited
US3273475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |