US3581635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic brightness detection and exposure control interlocking device
Assignee: HATTOU TOKEITEN KK
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Filing: 1969-02-25
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Granted: 1971-06-01
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Expires: 1989-02-25
Abstract
Abstract A camera is equipped with apparatus including an electric circuit for sensing the brightness of a selected subject to be photographed and indicator means visible to the camera operator and including a pointer arm automatically movable to either one of three positions depending upon the degree of brightness of the selected subject. The apparatus includes mechanism for moving the pointer arm into one of the three positions in response to the sensing of the brightness of the selected subject.
Inventors
- 👤 Kiyoshi Kitai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:41
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
In a camera having a shutter and electrical circuitry for controlling the operation of the camera shutter, means for opening and closing the shutter to produce an exposure, electric circuit means including means for sensing the brightness of a selected subject prior to the opening of the shutter for an exposure, indicator means visible to the camera operator having a plurality of possible positions including; a position indicating that the brightness of the selected subject is sufficient to take a normal daylight exposure, a position indicating that the brightness of the selected subject is only sufficient to take a long daylight exposure relatively to the normal exposure, and a positIon indicating that the brightness of the selected subject is not sufficient to take a daylight exposure, and means responsive to said sensing means for selecting the position of the indicator means corresponding to the brightness of the subject.
Claim 2
Dependent Claim
148 words
In a camera having a shutter and electrical circuitry for controlling the operation of the camera shutter, means for opening and closing the shutter to produce an exposure, electric circuit means including means for sensing the brightness of a selected subject prior to the opening of the shutter for an exposure, indicator means visible to the camera operator having a plurality of possible positions including; a position indicating that the brightness of the selected subject is sufficient to take a normal daylight exposure, a position indicating that the brightness of the selected subject is only sufficient to take a long daylight exposure relatively to the normal exposure, and a positIon indicating that the brightness of the selected subject is not sufficient to take a daylight exposure, and means responsive to said sensing means for selecting the position of the indicator means corresponding to the brightness of the subject.
Claim 3
Dependent Claim
42 words
In a camera having a shutter as set forth in claim 1 wherein said selecting means includes electromagnetic means responsive to said sensing means and mechanical means connected to and responsive to said electromagnetic means and operatively connected to said indicator means
Claim 4
Dependent Claim
61 words
In a camera having a shutter as set forth in claim 2 wherein said indicator means includes a movable pointer arm and indicia representing the corresponding brightness of the selected subject as sensed by said sensing means, said pointer arm being movable to align with the indicia corresponding to the brightness of the selected subject as sensed by said sensing means.
Claim 5
Dependent Claim
46 words
In a camera having a shutter as set forth in claim 3 wherein said means for opening and closing the shutter includes a manually operable trigger lever and a mechanical train operatively connected to said shutter and to said mechanical means and to said trigger lever.
Claim 6
Dependent Claim
44 words
In a camera having a shutter as set forth in claim 4 wherein said mechanical means includes an escapement mechanism that includes a substantially Y-shaped pawl connected to said electromagnetic means and a rotatable cam plate having a pin engageable with said pointer arm.
Claim 7
Dependent Claim
70 words
In a camera having a shutter as set forth in claim 5 wherein said electrical circuit means includes a self-contained electrical energy source and a plurality of transistors energizable by said electrical energy source, and wherein said sensing means includes a photoconductive element connected to a first one of said plurality of transistors and said electromagnetic means includes an electromagnet connected to a second one of said plurality of transistors.
Claim 8
Dependent Claim
62 words
In a camera having a shutter as set forth in claim 1 wherein said indicator means includes a movable pointer arm and indicia representing the corresponding brightness of the selected subject as sensed by said sensing means, said movable pointer arm being movable to align with the indicia corresponding to the brightness of the selected subject as sensed by said sensing means.
Claim 9
Dependent Claim
42 words
In a camera having a shutter as set forth in claim 2 wherein said selecting means includes electromagnetic means responsive to said sensing means and mechanical means connected to and responsive to said electromagnetic means and operatively connected to said pointer arm.
Claim 10
Dependent Claim
41 words
In a camera having a shutter as set forth in claim 1 wherein said means for opening and closing the camera shutter includes a manually operable trigger lever and a mechanical train connected to said shutter and to said trigger lever.
Claim 11
Dependent Claim
68 words
In a camera having a shutter as set forth in claim 1 wherein said indicator means includes a pointer arm and said selecting means includes electromagnetic means responsive to said sensing means and mechanical means connected to and responsive to said electromagnetic means and operatively connected to said indicator means and wherein said mechanical means includes an escapement mechanism operatively connecting said electromagnetic means to said pointer arm.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |