US4797107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copyable blackboard
Assignee: Brother Industries Ltd
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Filing: 1987-05-19
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Granted: 1989-01-10
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Expires: 2007-05-19
Abstract
Abstract A copyable blackboard has: a written member on which a picture including such as characters or figures is depicted a first carrier for carrying the written member, a light source for irradiating light to the picture on a portion of the written member located at a predetermined position on the written member to generate an optical signal corresponding to the picture, a photosensitive member which receives the optical signal from the written member and produces a latent image of the picture thereon. A second carrier is provided for carrying the photosensitive member, an image developing element for developing the latent image on the photosensitive member itself or on a copy paper to obtain a copy of the picture, and a control element for controlling the first and second carriers the photosensitive member and the light source.
Inventors
- 👤 Naoyuki Hatta
- 👤 Hideo Yoshihara
- 👤 Takeshi Izaki
- 👤 Akihiro Sawada
- 👤 Takemi Yamamoto
- 👤 Kazuo Sangyoji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:36
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/46; G03B27/48; G03B2227/00; G03B2227/32; G03B2227/325
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
156 words
A copyable blackboard comprising: a written member on which is depicted a picture comprising data such as characters or figures; first carrier means for carrying said written member; light source for irradiating light to said picture on a portion of said written member to generate an optical signal corresponding to said picture, said portion being located at a predetermined position on said written member; photosensitive member which receives said optical signal from said written member and thereby produces a corresponding latent image of said picture; second carrier means for carrying said photosensitive member; image developing means for developing said latent image of said photosensitive member on the photosensitive member itself; and control means for controlling said first and second carrier means to control feeding speeds of said written member and said photosensitive member to values determined to correspond to a preselected picture reduction ratio and to also control said image developing means and said light source.
Claim 2
Dependent Claim
156 words
A copyable blackboard comprising: a written member on which is depicted a picture comprising data such as characters or figures; first carrier means for carrying said written member; light source for irradiating light to said picture on a portion of said written member to generate an optical signal corresponding to said picture, said portion being located at a predetermined position on said written member; photosensitive member which receives said optical signal from said written member and thereby produces a corresponding latent image of said picture; second carrier means for carrying said photosensitive member; image developing means for developing said latent image of said photosensitive member on the photosensitive member itself; and control means for controlling said first and second carrier means to control feeding speeds of said written member and said photosensitive member to values determined to correspond to a preselected picture reduction ratio and to also control said image developing means and said light source.
Claim 3
Dependent Claim
27 words
A copyable blackboard as defined in claim 1, wherein: said written member is opaque, and light reflected therefrom is utilized to make a copy of said picture.
Claim 4
Dependent Claim
34 words
A copyable blackboard as defined in claim 1, wherein: said written member is a light penetrable sheet, and light which has penetrated said written member is utilized to make a copy of said picture.
Claim 5
Dependent Claim
17 words
A copyable blackboard as defined in claim 1, wherein: said photosensitive member is a photosensitive carbonless paper.
Claim 6
Dependent Claim
17 words
A copyable blackboard as defined in claim 1, wherein: said image developing means comprises a pressure roller.
Claim 7
Dependent Claim
33 words
A copyable blackboard as defined in claim 1, further comprising: means for transferring the developed latent image from the photosensitive member to a copy paper to produce a copy of the picture thereon.
Claim 8
Dependent Claim
17 words
A copyable blackboard as defined in claim 1, wherein: said photosensitive member is a diazo copy paper.
Claim 9
Dependent Claim
151 words
A copyable blackboard comprising: a written member on which is depicted a picture comprising data such as characters or figures; first carrier means for movably carrying said written member; light source means for irradiating light to said picture on a portion of said written member to generate an optical signal corresponding to said picture, which portion is located at a predetermined position; photosensitive means for receiving said optical signal from said written member and thereby producing a corresponding latent image of said picture; second carrier means for movably carrying said photosensitive means; shutter means for opening and closing a light path from said written member to said photosensitive means, provided on said light path; image developing means for developing said latent image of said photosensitive means on the photosensitive means itself; and control means for controlling said first and second carrier means, said image developing means and said light source means.
Claim 10
Dependent Claim
151 words
A copyable blackboard comprising: a written member on which is depicted a picture comprising data such as characters or figures; first carrier means for movably carrying said written member; light source means for irradiating light to said picture on a portion of said written member to generate an optical signal corresponding to said picture, which portion is located at a predetermined position; photosensitive means for receiving said optical signal from said written member and thereby producing a corresponding latent image of said picture; second carrier means for movably carrying said photosensitive means; shutter means for opening and closing a light path from said written member to said photosensitive means, provided on said light path; image developing means for developing said latent image of said photosensitive means on the photosensitive means itself; and control means for controlling said first and second carrier means, said image developing means and said light source means.
Claim 11
Dependent Claim
28 words
A copyable blackboard as defined in claim 8, wherein: said photosensitive means comprises a heat-developing-type silver salt photographic paper, and said image developing means comprises developing equipment therefor.
Claim 12
Dependent Claim
16 words
A copyable blackboard as defined in claim 8, wherein: said shutter apparatus comprises a mechanical shutter.
Claim 13
Dependent Claim
33 words
A copyable blackboard as defined in claim 8, further comprising: means for transferring the developed latent image from the photosensitive member to a copy paper to produce a copy of the picture thereon.
Claim 14
Dependent Claim
16 words
A copyable blackboard as defined in claim 8, wherein: said shutter apparatus comprises a liquid shutter.
Claim 15
Dependent Claim
27 words
A copyable blackboard as defined in claim 8, wherein: said written member is opaque, and light reflected therefrom is utilized to make a copy of said picture.
Claim 16
Dependent Claim
34 words
A copyable blackboard as defined in claim 8, wherein: said written member is a light penetrable sheet, and light which has penetrated said written member is utilized to make a copy of said picture.
Claim 17
Dependent Claim
199 words
A copyable blackboard, comprising: a written member on which is depicted a picture comprising data such as characters or figures; first carrier means for movably carrying said written member; first light source means for irradiating light to said picture on a portion of said written member to generate an optical signal corresponding to said picture said portion being located at a predetermined position; means for supplying a manuscript bearing optically determinable data onto said photosensitive member from the outside; second light source means for irradiating light to said manuscript to generate an optical signal corresponding to said data thereon; photosensitive means for receiving light from said second light source means which has penetrated said manuscript, thereby to produce a latent image corresponding to said optical signal; second carrier means for movably carrying said photosensitive means; means for supplying said manuscript onto said photosensitive member from the outside; second light source for irradiating light to said manuscript which is supplied onto said photosensitive member; image developing means for developing said latent image on said photosensitive means itself; and control means for controlling said first and second carrier means, said image developing means and said first and second light source means.
Claim 18
Dependent Claim
199 words
A copyable blackboard, comprising: a written member on which is depicted a picture comprising data such as characters or figures; first carrier means for movably carrying said written member; first light source means for irradiating light to said picture on a portion of said written member to generate an optical signal corresponding to said picture said portion being located at a predetermined position; means for supplying a manuscript bearing optically determinable data onto said photosensitive member from the outside; second light source means for irradiating light to said manuscript to generate an optical signal corresponding to said data thereon; photosensitive means for receiving light from said second light source means which has penetrated said manuscript, thereby to produce a latent image corresponding to said optical signal; second carrier means for movably carrying said photosensitive means; means for supplying said manuscript onto said photosensitive member from the outside; second light source for irradiating light to said manuscript which is supplied onto said photosensitive member; image developing means for developing said latent image on said photosensitive means itself; and control means for controlling said first and second carrier means, said image developing means and said first and second light source means.
Claim 19
Dependent Claim
36 words
A copyable blackboard as defined in claim 15, wherein: said written member is a light penetrable sheet, and light which has penetrated said written member is utilized to make a copy corresponding to said latent image.
Claim 20
Dependent Claim
17 words
A copyable blackboard as defined in claim 15, wherein: said photosensitive member is a photosensitive carbonless paper.
Claim 21
Dependent Claim
17 words
A copyable blackboard as defined in claim 15, wherein: said image developing means comprises a pressure roller.
Claim 22
Dependent Claim
33 words
A copyable blackboard as defined in claim 15, further comprising: means for transferring the developed latent image from the photosensitive member to a copy paper to produce a copy of the picture thereon.
Claim 23
Dependent Claim
17 words
A copyable blackboard as defined in claim 15, wherein: said photosensitive member is a diazo copy paper.
Claim 24
Dependent Claim
27 words
A copyable blackboard as defined in claim 15, wherein: said written member is opaque, and light reflected therefrom is utilized to make a copy of said picture.
Claim 25
Dependent Claim
20 words
A copyable blackboard as defined in claim 15, wherein: said latent image corresponds to said picture on said written member.
Claim 26
Dependent Claim
18 words
A copyable blackboard as defined in claim 15, wherein: said latent image corresponds to data from said manuscript.
Claim 27
Dependent Claim
172 words
A copyable blackboard, comprising: a written member on which is depicted a picture comprising data such as characters or figures; first carrier means for movably carrying said written member; first light source means for irradiating light to a picture on a portion of said written member to generate an optical signal corresponding to said picture, said portion being located at a predetermined position on said written member; a recording member; means for supplying an intermediate film sheet onto said recording member; photosensitive means for receiving said optical signal from said written member and thereby producing a corresponding latent image of said picture; second carrier means for movably carrying said photosensitive means; image developing means for developing said latent image of said photosensitive means on said photosensitive means itself; second light source means for irradiating light to said intermediate sheet, thereby to produce a latent image on said photosensitive means; and control means for controlling said first and second carrier means, said light developing means and said first and second light source means.
Claim 28
Dependent Claim
172 words
A copyable blackboard, comprising: a written member on which is depicted a picture comprising data such as characters or figures; first carrier means for movably carrying said written member; first light source means for irradiating light to a picture on a portion of said written member to generate an optical signal corresponding to said picture, said portion being located at a predetermined position on said written member; a recording member; means for supplying an intermediate film sheet onto said recording member; photosensitive means for receiving said optical signal from said written member and thereby producing a corresponding latent image of said picture; second carrier means for movably carrying said photosensitive means; image developing means for developing said latent image of said photosensitive means on said photosensitive means itself; second light source means for irradiating light to said intermediate sheet, thereby to produce a latent image on said photosensitive means; and control means for controlling said first and second carrier means, said light developing means and said first and second light source means.
Claim 29
Dependent Claim
35 words
A copyable blackboard as defined in claim 24, wherein: said written member comprises a white polyester sheet and said optical signal, generated by light reflected from said written member, is utilized to make a copy.
Claim 30
Dependent Claim
31 words
A copyable blackboard as defined in claim 24, wherein: said written member is a light penetrable sheet, and light which has penetrated said written member is utilized to make a copy.
Claim 31
Dependent Claim
16 words
A copyable blackboard as defined in claim 24, wherein: said photosensitive member comprises a photosensitive paper.
Claim 32
Dependent Claim
17 words
A copyable blackboard as defined in claim 24, wherein: said image developing means comprises a pressure roller.
Claim 33
Dependent Claim
33 words
A copyable blackboard as defined in claim 24, further comprising: means for transferring the developed latent image from the photosensitive member to a copy paper to produce a copy of the picture thereon.
References Cited (Backward Citations)
US4399209A
Cited
US4440846A
Cited
US4587568A
Cited
US4587568B1
Cited
US4600951A
Cited
US4667254A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |