Patent US3852778A successfully refreshed from Google Patents.
US3852778A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single lens reflex camera of ttl photometry type
Assignee: Canon Inc
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Filing: 1972-11-13
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Granted: 1974-12-03
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Expires: 1992-11-13
Abstract
Abstract In the apparatus disclosed, a photosensitive element is exposed to light through an objective lens. A switch passes information from the element to a storage capacitor while the camera shutter is closed. A diaphragm driver drives an automatic diaphragm toward a preset position. The driver actuates the switch when the diaphragm reaches the preset value. A shutter control responds to the charge on the capacitor to initiate an exposure and terminate the exposure. The photosensitive element remains unexposed to light through the objective lens while a single lens reflex mirror blocks the light path to the element as the shutter is opened.
Inventors
- 👤 Y Iura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:56
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
261 words
A through-the-lens light measuring and exposure control apparatus for a single lens reflex camera having an objective lens, comprising a photosensitive element exposed to light through the objective lens and having a delayed time response characteristic which produces a time delay, shutter means, an information storage capacitor, openable and closable switching means selectively connecting said capacitor to said element for inserting information from said element into said storage capacitor, a view finder including a movable reflector, normally open automatic diaphragm means, diaphragm driving means for driving said diaphragm means to a predetermined aperture, operation initiating means coupled to said driving means for initiating operation of said driving means and coupled to said switching means for closing said switching means, said driving means operating independently of said initiating means after the operation of said driving means is initiated and said driving means being engaged with said switching means to open said switching means and said shutter means when said diaphragm reaches its predetermined aperture, control means responsive to said capacitor for closing said shutter means in accordance with the information in said capacitor, and actuating means coupled to said driving means and said movable reflector for moving said movable reflector so as to block the light path to said element when said shutter means has been opened; said driving means including delay means for delaying the driving action, for a predetermined time longer than the time delay produced by the delayed time response characteristic, after said initiating means closes said switching means to allow the capacitor to store information from said element.
Claim 2
Dependent Claim
261 words
A through-the-lens light measuring and exposure control apparatus for a single lens reflex camera having an objective lens, comprising a photosensitive element exposed to light through the objective lens and having a delayed time response characteristic which produces a time delay, shutter means, an information storage capacitor, openable and closable switching means selectively connecting said capacitor to said element for inserting information from said element into said storage capacitor, a view finder including a movable reflector, normally open automatic diaphragm means, diaphragm driving means for driving said diaphragm means to a predetermined aperture, operation initiating means coupled to said driving means for initiating operation of said driving means and coupled to said switching means for closing said switching means, said driving means operating independently of said initiating means after the operation of said driving means is initiated and said driving means being engaged with said switching means to open said switching means and said shutter means when said diaphragm reaches its predetermined aperture, control means responsive to said capacitor for closing said shutter means in accordance with the information in said capacitor, and actuating means coupled to said driving means and said movable reflector for moving said movable reflector so as to block the light path to said element when said shutter means has been opened; said driving means including delay means for delaying the driving action, for a predetermined time longer than the time delay produced by the delayed time response characteristic, after said initiating means closes said switching means to allow the capacitor to store information from said element.
Claim 3
Dependent Claim
192 words
A light measuring and exposure control apparatus for a single lens reflex camera having an objective lens, comprising photoelectric storage means for responding to light and accumulating and storing information corresponding to light being measured and having a delayed time response characteristic which produces a time delay, operation initiating means coupled to said storage means for causing said storage means to start accumulating information, shutter means, diaphragm means, driving means having an operation initiated by said initiating means for closing the diaphragm to a predetermined aperture and coupled to said storage means for ending the accumulation of information, said driving means opening said shutter means, control Means responsive to the information in said storage means and coupled to said shutter means for closing said shutter means on the basis of the stored information; and delay means in said driving means for delaying the end of accumulation of information by said storage means, for a predetermined time longer than the time delay produced by the delayed time response characteristic, until a minimum amount of information has been accumulated; the delay of said delay means being independent of the operation of said initiating means.
Claim 4
Dependent Claim
192 words
A light measuring and exposure control apparatus for a single lens reflex camera having an objective lens, comprising photoelectric storage means for responding to light and accumulating and storing information corresponding to light being measured and having a delayed time response characteristic which produces a time delay, operation initiating means coupled to said storage means for causing said storage means to start accumulating information, shutter means, diaphragm means, driving means having an operation initiated by said initiating means for closing the diaphragm to a predetermined aperture and coupled to said storage means for ending the accumulation of information, said driving means opening said shutter means, control Means responsive to the information in said storage means and coupled to said shutter means for closing said shutter means on the basis of the stored information; and delay means in said driving means for delaying the end of accumulation of information by said storage means, for a predetermined time longer than the time delay produced by the delayed time response characteristic, until a minimum amount of information has been accumulated; the delay of said delay means being independent of the operation of said initiating means.
Claim 5
Dependent Claim
31 words
An apparatus as in claim 2, wherein said driving means is independent of the operation of said initiating means after said initiating means has initiated the operation of said driving means.
Claim 6
Dependent Claim
240 words
A through-the-lens light measuring and exposure control apparatus for a single lens reflex camera having an objective lens, comprising a photosensitive element exposed to light through the objective lens, shutter means, an information storage capacitor, openable and closable switching means selectively connecting said capacitor to said element for inserting information from said element into said storage capacitor, a view finder including a movable reflector, normally open automatic diaphragm means, diaphragm driving means for driving said diaphragm means to a predetermined aperture, operation initiating means coupled to said driving means for initiating operation of said driving means and coupled to said switching means for closing said switching means, said driving means operating independently of said initiating means after the operation of said driving means is initiated and said driving means being engaged with said switching means to open said switching means and said shutter means when said diaphragm reaches its predetermined aperture, control means responsive to said capacitor for closing said shutter means in accordance with the information in said capacitor, and actuating means coupled to said driving means and said movable reflector for moving said movable reflector so as to block the light path to said element when said shutter means has been opened, said driving means including delay means for delaying the driving action after said initiating means closes said switching means to allow the capacitor to store information from said element, said delay means including a mechanical governor.
Claim 7
Dependent Claim
240 words
A through-the-lens light measuring and exposure control apparatus for a single lens reflex camera having an objective lens, comprising a photosensitive element exposed to light through the objective lens, shutter means, an information storage capacitor, openable and closable switching means selectively connecting said capacitor to said element for inserting information from said element into said storage capacitor, a view finder including a movable reflector, normally open automatic diaphragm means, diaphragm driving means for driving said diaphragm means to a predetermined aperture, operation initiating means coupled to said driving means for initiating operation of said driving means and coupled to said switching means for closing said switching means, said driving means operating independently of said initiating means after the operation of said driving means is initiated and said driving means being engaged with said switching means to open said switching means and said shutter means when said diaphragm reaches its predetermined aperture, control means responsive to said capacitor for closing said shutter means in accordance with the information in said capacitor, and actuating means coupled to said driving means and said movable reflector for moving said movable reflector so as to block the light path to said element when said shutter means has been opened, said driving means including delay means for delaying the driving action after said initiating means closes said switching means to allow the capacitor to store information from said element, said delay means including a mechanical governor.
Claim 8
Dependent Claim
213 words
A camera, comprising an objective lens, shutter means in the path of light passing through said objective lens, a single lens reflex viewing system having a pivotable mirror, a shutter button, photoelectric storage means coupled to said shutter button for responding to light and accumulating and storing information corresponding to light being measured after actuation by said shutter button and having a delayed time response characteristic which produces a time delay, driving means having an operation initiated by said initiating means for moving said pivotable mirror out of the path of light from said objective lens and coupled to said storage means for ending accumulation of information, said driving means opening said shutter means, control means responsive to the information in said storage means and coupled to said shutter means for closing said shutter means on the basis of the stored information; and delay means in said driving means for delaying the end of the accumulation of information by said storage means, for a predetermined time longer than the time delay produced by the delayed time response characteristic, until a minimum amount of information has been accumulated; the delay of said delay means being independent of the operation of said initiating means after said initiating means has initiated operation of said driving means.
Claim 9
Dependent Claim
213 words
A camera, comprising an objective lens, shutter means in the path of light passing through said objective lens, a single lens reflex viewing system having a pivotable mirror, a shutter button, photoelectric storage means coupled to said shutter button for responding to light and accumulating and storing information corresponding to light being measured after actuation by said shutter button and having a delayed time response characteristic which produces a time delay, driving means having an operation initiated by said initiating means for moving said pivotable mirror out of the path of light from said objective lens and coupled to said storage means for ending accumulation of information, said driving means opening said shutter means, control means responsive to the information in said storage means and coupled to said shutter means for closing said shutter means on the basis of the stored information; and delay means in said driving means for delaying the end of the accumulation of information by said storage means, for a predetermined time longer than the time delay produced by the delayed time response characteristic, until a minimum amount of information has been accumulated; the delay of said delay means being independent of the operation of said initiating means after said initiating means has initiated operation of said driving means.
Claim 10
Dependent Claim
21 words
A camera as in claim 5, further comprising diaphragm means, said driving means closing the diaphragm means to a predetermined aperture.
Claim 11
Dependent Claim
33 words
A camera as in claim 5, wherein the operation of said driving means is independent of the operation of the shutter button after the shutter button has initiated operatIon of said driving means.
Claim 12
Dependent Claim
65 words
A camera as in claim 5, wherein wind-up means sets said driving means and a lock holds said driving means in the set position, said driving means including energy storage means in which said wind-up means stores energy, said shutter release button actuating said lock to release said driving means from the set position so that said energy storage means can drive said winding means.
Claim 13
Dependent Claim
207 words
A camera, comprising an objective lens, shutter means in the path of light passing through said objective lens, a single lens reflex viewing system having a pivotable mirror, a shutter button, photoelectric storage means coupled to said shutter button for responding to light and accumulating and storing information corresponding to light being measured after actuation by said shutter button, driving means having an operation initiated by said initiating means for moving said pivotable mirror out of the path of light from said objective lens and coupled to said storage means for ending accumulation of information, said driving means opening said shutter means, control means responsive to the information in said storage means on the basis of the stored information, and delay means in said driving means for delaying the end of the accumulation of information by said storage means until a minimum amount of information has been accumulated, the delay of said delay means being independent of the operation of said initiating means after said initiating means has initiated operation of said driving means the operation of said driving means being independent of the operation of said shutter button after the shutter button has initiated operation of said driving means, said delay means including a mechanical governor.
Claim 14
Dependent Claim
207 words
A camera, comprising an objective lens, shutter means in the path of light passing through said objective lens, a single lens reflex viewing system having a pivotable mirror, a shutter button, photoelectric storage means coupled to said shutter button for responding to light and accumulating and storing information corresponding to light being measured after actuation by said shutter button, driving means having an operation initiated by said initiating means for moving said pivotable mirror out of the path of light from said objective lens and coupled to said storage means for ending accumulation of information, said driving means opening said shutter means, control means responsive to the information in said storage means on the basis of the stored information, and delay means in said driving means for delaying the end of the accumulation of information by said storage means until a minimum amount of information has been accumulated, the delay of said delay means being independent of the operation of said initiating means after said initiating means has initiated operation of said driving means the operation of said driving means being independent of the operation of said shutter button after the shutter button has initiated operation of said driving means, said delay means including a mechanical governor.
Claim 15
Dependent Claim
52 words
A camera as in claim 9, wherein said driving means includes a projection responsive to the operation of the governor and movable in response to initiation by the shutter button from one position to a second position in which it actuates operation of the mirror at a rate determined by the governor.
Claim 16
Dependent Claim
65 words
A camera as in claim 9, wherein wind-up means sets said driving means and a lock holds said driving means in the set position, said driving means including energy storage means in which said wind-up means stores energy, said shutter release button actuating said lock to release said driving means from the set position so that said energy storage means can drive said winding means.
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) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |