US3682539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting apparatus for electrophotographic photocopying machine
Assignee: Canon Inc
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Filing: 1970-06-08
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Granted: 1972-08-08
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Expires: 1990-06-08
Abstract
Abstract An electrophotographic photocopying machine is provided with a lighting device in which a plurality of different color lamps are carried by a common rotary body so that they may be sequentially and selectively rotated to align with a lighting or exposure position where they are turned on. Each of colored lamps has an optical shielding member supported by the common rotary body, and the colored lamps and shielding members are wholly enveloped by a housing which has an optical opening with which each opening of the shielding members is rotatably aligned in accomplishing an exposure operation.
Inventors
- 👤 Keizo Yamaji
- 👤 Takao Toryu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:30
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/54; G03B27/542; G03G; G03G15/00; G03G15/01; G03G15/0105; G03G15/011; G03G15/04; G03G15/04036
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
145 words
In an electrophotographic photocopying machine comprising electrostatic latent image forming means comprising means for imparting an electrostatic charge to the surface of a photosensitive member and means for projecting a light image of an original to be reproduced upon said surface of said photosensitive member, means for developing said latent electrostatic image, an original holder upon which the original is placed in position and means for lighting the surface of the original, an improved lighting means comprising a plurality of light sources each emitting light within a different luminous spectrum, rotary means to which said plurality of light sources are fixed, a housing enclosing said plurality of light sources upon said rotary means and having an optical opening positioned to direct light from one of said light sources having a desired wavelength range to a predetermined area and power means for driving said rotary means.
Claim 2
Dependent Claim
145 words
In an electrophotographic photocopying machine comprising electrostatic latent image forming means comprising means for imparting an electrostatic charge to the surface of a photosensitive member and means for projecting a light image of an original to be reproduced upon said surface of said photosensitive member, means for developing said latent electrostatic image, an original holder upon which the original is placed in position and means for lighting the surface of the original, an improved lighting means comprising a plurality of light sources each emitting light within a different luminous spectrum, rotary means to which said plurality of light sources are fixed, a housing enclosing said plurality of light sources upon said rotary means and having an optical opening positioned to direct light from one of said light sources having a desired wavelength range to a predetermined area and power means for driving said rotary means.
Claim 3
Dependent Claim
16 words
A lighting device as defined in claim 1 wherein said rotary means is a rotary shaft.
Claim 4
Dependent Claim
31 words
A lighting device of claim 1 wherein each of said light sources is selected to emit a different light within the spectral range of red, green, blue or a combination thereof.
Claim 5
Dependent Claim
23 words
A lighting device as defined in claim 1 wherein said optical opening of said housing is provided with a condenser lens and reflectors.
Claim 6
Dependent Claim
48 words
A lighting device as defined in claim 1 wherein said plurality of light sources are normally, illuminated and light shield members are interposed between the adjacent light sources so that only the light from the light source opposed to said optical opening is directed toward said predetermined area.
Claim 7
Dependent Claim
15 words
A lighting device as defined in claim 5 wherein said light shield members are reflectors.
Claim 8
Dependent Claim
31 words
A lighting device as defined in claim 1 wherein said light sources comprise a plurality of sections in a circular glass tube, each of said sections having a different phosphors coating.
Claim 9
Dependent Claim
25 words
A lighting device as defined in claim 1 wherein said light sources comprise a plurality of separate arcuate fluorescent lamps arranged to form a circle.
Claim 10
Dependent Claim
156 words
In an electrophotographic photocopying machine comprising electrostatic latent image forming means comprising means for imparting an electrostatic charge to the surface of a photosensitive member and means for projecting a light image of an original to be reproduced upon said surface of said photosensitive member, means for developing said latent electrostatic image, an original holder upon which the original is placed in position and means for lighting the surface of the original, an improved lighting means comprising a plurality of light sources each emitting light within a different luminous spectrum, rotary means to which said plurality of light sources are fixed, a housing enclosing said plurality of light sources upon said rotary means and having an optical opening positioned to direct from one of said light sources light having a desired wavelength range to a predetermined area, said housing being provided with means for cooling said lighting means, and power means for driving said rotary means.
Claim 11
Dependent Claim
156 words
In an electrophotographic photocopying machine comprising electrostatic latent image forming means comprising means for imparting an electrostatic charge to the surface of a photosensitive member and means for projecting a light image of an original to be reproduced upon said surface of said photosensitive member, means for developing said latent electrostatic image, an original holder upon which the original is placed in position and means for lighting the surface of the original, an improved lighting means comprising a plurality of light sources each emitting light within a different luminous spectrum, rotary means to which said plurality of light sources are fixed, a housing enclosing said plurality of light sources upon said rotary means and having an optical opening positioned to direct from one of said light sources light having a desired wavelength range to a predetermined area, said housing being provided with means for cooling said lighting means, and power means for driving said rotary means.
Claim 12
Dependent Claim
17 words
A lighting device as defined in claim 9, wherein said cooling means comprises at least one fan.
Claim 13
Dependent Claim
39 words
Alighting device as defined in claim 9, wherein each light of different luminous spectrum is selected from the group consisting of red, green, blue and white lights in color and other lights having spectral photographing effect substantially equivalent thereto.
Claim 14
Dependent Claim
31 words
A lighting device of claim 9 wherein each of said light sources is selected to emit a different light within the spectral range of red, green, blue or a combination thereof.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |