US4354751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure system for a camera
Assignee: Minolta Co Ltd
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Filing: 1981-03-18
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Granted: 1982-10-19
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Expires: 2001-03-18
Abstract
Abstract An exposure system for use in a camera includes a light emitting apparatus which is capable of selectively projecting a first type of light which flashes instantaneously with a predetermined light quantity and a second type of light which flashes for a prolonged period of time with a predetermined constant light intensity, and a selecting circuit for selecting the first type of light when a target object to be photographed is located a predetermined distance away from the camera, and the second type of light when the target object is located closer to the camera than the predetermined distance.
Inventors
- 👤 Tatsuro Izumi
- 👤 Nobuyuki Taniguchi
- 👤 Toshiaki Matsumoto
- 👤 Masatake Niwa
- 👤 Tokuji Ishida
- 👤 Masatoshi Itoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:32
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/16
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
95 words
An exposure system for a camera comprising: means for projecting an artificial light towards an object, said projecting means being capable of selectively projecting a first type of light which flashes instantaneously with a predetermined light quantity and a second type of light which flashes a prolonged period of time with a predetermined constant light intensity; and means for selecting said first type of light when a distance to the object is greater than a standard, and for selecting said second type of light when the distance to the object is less than the standard.
Claim 2
Dependent Claim
95 words
An exposure system for a camera comprising: means for projecting an artificial light towards an object, said projecting means being capable of selectively projecting a first type of light which flashes instantaneously with a predetermined light quantity and a second type of light which flashes a prolonged period of time with a predetermined constant light intensity; and means for selecting said first type of light when a distance to the object is greater than a standard, and for selecting said second type of light when the distance to the object is less than the standard.
Claim 3
Dependent Claim
13 words
An exposure system as claimed in claim 1, wherein said standard is variable.
Claim 4
Dependent Claim
72 words
An exposure system as claimed in claim 1, further comprising a focal plane shutter with a leading curtain and a trailing curtain, and timing means for initiating the projection of the artificial light at the end of the travel of said leading curtain in the case of said first type of light, and at the beginning of the travel of said leading curtain in the case of said second type of light.
Claim 5
Dependent Claim
65 words
An exposure system as claimed in claim 1, further comprising means for obtaining an information of distance to the object, means for setting an information of film speed and means for controlling the exposure in response to the predetermined intensity of the artificial light, the information of distance to the object, and the information of film speed, when said second type of light is selected.
Claim 6
Dependent Claim
47 words
An exposure system as claimed in claim 4, further comprising means for controlling the aperture size in response to the predetermined quantity of said artificial light, the information of distance to the object, and the information of film speed, when said first type of light is selected.
Claim 7
Dependent Claim
43 words
An exposure system as claimed in claim 4, wherein said exposure controlling means includes means for changing the aperture size in response to the change in the information of distance to the object with the exposure time being fixed to a predetermined time.
Claim 8
Dependent Claim
42 words
An exposure system as claimed in claim 4, wherein said exposure controlling means includes means for changing the exposure time in response to the change in the information of distance to the object with the aperture being fixed to a predetermined size.
Claim 9
Dependent Claim
42 words
An exposure system as claimed in claim 4, wherein said exposure controlling means includes means for changing both the exposure time and the aperture size in response to the change in the information of distance to the object in a predetermined manner.
Claim 10
Dependent Claim
31 words
An exposure system as claimed in claim 4, wherein said exposure controlling means includes means for calculating an effective aperture size relatively to the magnification of the image of the object.
Claim 11
Dependent Claim
81 words
An exposure system for a camera comprising: electronic flash means for projecting an artificial light which flashes for a prolonged period of time and has a predetermined constant light intensity; means for obtaining an information of distance to the object; means for setting an information of film speed; and means for controlling the exposure of the film in response to the predetermined intensity of said prolonged flash light, the information of distance to the object and the information of film speed.
Claim 12
Dependent Claim
81 words
An exposure system for a camera comprising: electronic flash means for projecting an artificial light which flashes for a prolonged period of time and has a predetermined constant light intensity; means for obtaining an information of distance to the object; means for setting an information of film speed; and means for controlling the exposure of the film in response to the predetermined intensity of said prolonged flash light, the information of distance to the object and the information of film speed.
Claim 13
Dependent Claim
43 words
An exposure system as claimed in claim 10, wherein said exposure controlling means includes means for changing the aperture size in response to the change in the information of distance to the object with the exposure time being fixed to a predetermined time.
Claim 14
Dependent Claim
42 words
An exposure system as claimed in claim 10, wherein said exposure controlling means includes means for changing the exposure time in response to the change in the information of distance to the object with the aperture being fixed to a predetermined size.
Claim 15
Dependent Claim
42 words
An exposure system as claimed in claim 10, wherein said exposure controlling means includes means for changing both the exposure time and the aperture size in response to the change in the information of distance to the object in a predetermined manner.
Claim 16
Dependent Claim
111 words
An exposure system for a camera comprising: means for projecting an artificial light of a prolonged flash light which continues to project its flash light during a predetermined period of time and has a predetermined light intensity; means for obtaining an information of distance to the object; means for setting an information of film speed; and means for controlling the exposure of the film in response to the predetermined intensity of said prolonged flash light, the information of distance to the object and the information of film speed; wherein said exposure controlling means includes means for calculating an effective aperture size relatively to the magnification of the image of the object.
Claim 17
Dependent Claim
111 words
An exposure system for a camera comprising: means for projecting an artificial light of a prolonged flash light which continues to project its flash light during a predetermined period of time and has a predetermined light intensity; means for obtaining an information of distance to the object; means for setting an information of film speed; and means for controlling the exposure of the film in response to the predetermined intensity of said prolonged flash light, the information of distance to the object and the information of film speed; wherein said exposure controlling means includes means for calculating an effective aperture size relatively to the magnification of the image of the object.
Claim 18
Dependent Claim
48 words
An exposure system as claimed in claim 10, further comprising a focal plane shutter with a leading curtain and a trailing curtain, and timing means for initiating the projection of the artificial light of the prolonged flash light at the beginning of the travel of said leading curtain.
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) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |