US3604327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera light sensing system
Assignee: Minolta Co Ltd
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Filing: 1969-06-11
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Granted: 1971-09-14
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Expires: 1989-06-11
Abstract
Abstract A mechanism for automatically adjusting the sensitivity of a camera light measuring system in accordance with the sensitivity of film in a magazine which is provided with a front sensitivity index defining shoulder includes, a variable light attenuator positioned ahead of a photocell, and a magazine compartment with a front wall. A sensing finger projects through the front wall and is spring urged to advance into engagement with the index and controls the light attenuator. A spring loaded return member urges the finger to a retracted position and includes a plunger projecting into the magazine compartment to be pushed by the inserted magazine to advance the return member and actuate the sensing and control operation and thereby adjust the light attenuator in accordance with the film sensitivity.
Inventors
- 👤 Hiroshi Hirata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:54
CPC Classifications
G; G03; G03B; G03B7/00; G01; G01J; G01J1/00; G01J1/10; G01J1/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
100 words
A camera employing a replacable film magazine provided with index defining means positioned on the magazine in accordance with the sensitivity of the film therein comprising means for sensing the position of said index including an index sensing element movable between a retracted position and an index sensing advanced position, retracting spring means resiliently urging said sensing element toward said retracted position activating means responsive to the insertion of said magazine into said camera for resiliently effecting the advance of said sensing element toward said index, and light measuring means controlled in response to the position of said sensing element.
Claim 2
Dependent Claim
100 words
A camera employing a replacable film magazine provided with index defining means positioned on the magazine in accordance with the sensitivity of the film therein comprising means for sensing the position of said index including an index sensing element movable between a retracted position and an index sensing advanced position, retracting spring means resiliently urging said sensing element toward said retracted position activating means responsive to the insertion of said magazine into said camera for resiliently effecting the advance of said sensing element toward said index, and light measuring means controlled in response to the position of said sensing element.
Claim 3
Dependent Claim
39 words
The camera of claim 1 wherein said light measuring means comprises a photosensitive element and an adjustable light attenuator located in the path of light incident on said photosensitive element and responsive to the position of said sensing element.
Claim 4
Dependent Claim
112 words
The camera of claim 2 wherein said sensing means includes a slide member supporting said sensing element and movable therewith between retracted and advanced positions, said activating means includes first spring means normally urging said slide member toward its advanced position and a return member engaging said slide member and movable therewith between retracted and advanced positions, and said retracting spring means includes a spring urging said return member toward its retracted position whereby to urge said slide member toward its retracted position and an actuating member connecTed to said return member and motivated by the insertion of said magazine in said camera to urge said return member to its advanced position.
Claim 5
Dependent Claim
163 words
A camera provided with a magazine compartment having a front partition wall with a longitudinal slot formed therein and employing a replacable film magazine including a front face confronting said front wall when in camera loaded condition and having a recess provided with an index defining shoulder positioned on said magazine in accordance with the sensitivity of the film therein comprising means disposed forwardly of said partition wall for sensing the position of said index and including a sensing element comprising a finger projecting through said slot into registry with said magazine recess and being slideable along said slot between a retracted position and an index sensing advanced position, activating means responsive to the insertion of said magazine into said camera for effecting the advance of said sensing element toward said index and including a resiliently rearwardly urged plunger member projecting through said partition wall into said magazine compartment, and light measuring means controlled in response to the position of said sensing element.
Claim 6
Dependent Claim
163 words
A camera provided with a magazine compartment having a front partition wall with a longitudinal slot formed therein and employing a replacable film magazine including a front face confronting said front wall when in camera loaded condition and having a recess provided with an index defining shoulder positioned on said magazine in accordance with the sensitivity of the film therein comprising means disposed forwardly of said partition wall for sensing the position of said index and including a sensing element comprising a finger projecting through said slot into registry with said magazine recess and being slideable along said slot between a retracted position and an index sensing advanced position, activating means responsive to the insertion of said magazine into said camera for effecting the advance of said sensing element toward said index and including a resiliently rearwardly urged plunger member projecting through said partition wall into said magazine compartment, and light measuring means controlled in response to the position of said sensing element.
Claim 7
Dependent Claim
17 words
The camera of claim 4 wherein said sensing element and said plunger are longitudinally and transversely spaced.
Claim 8
Dependent Claim
49 words
The camera of claim 4 wherein said magazine compartment includes a side opening for insertion of said magazine, a lid releasably closing said side opening, and a sidewall opposite said side opening, said plunger being positioned proximate said wall and said sensing element being disposed proximate said side opening.
Claim 9
Independent Claim
142 words
A device for automatically setting film sensitivity in a camera, comprising an operating plate spring urged to a raised position and being depressible by a film magazine as the film magazine is inserted in the body of the camera; a sensing plate having a sensing finger spring urged to a depressed position and being normally raised with said operating plate, said sensing plate being released from said raised position in response to said depression of said operating plate; a film sensitivity indicating means integrally formed in said film magazine, said sensing finger moving until coming into engagement with said film sensitivity indicating means in response to said release of said sensing plate; and a light value control member being movable by said sensing plate upon said release of said locking, so as to control incident intensity of radiation to a photoelectric element.
Claim 10
Independent Claim
142 words
A device for automatically setting film sensitivity in a camera, comprising an operating plate spring urged to a raised position and being depressible by a film magazine as the film magazine is inserted in the body of the camera; a sensing plate having a sensing finger spring urged to a depressed position and being normally raised with said operating plate, said sensing plate being released from said raised position in response to said depression of said operating plate; a film sensitivity indicating means integrally formed in said film magazine, said sensing finger moving until coming into engagement with said film sensitivity indicating means in response to said release of said sensing plate; and a light value control member being movable by said sensing plate upon said release of said locking, so as to control incident intensity of radiation to a photoelectric element.
Claim 11
Independent Claim
182 words
A device for automatically setting film sensitivity in a camera, comprising an operating plate being depressible by a film magazine as the film magazine is inserted in the body of the camera; a sensing plate having a sensing finger and being normally locked, said sensing plate being released from said locking in response to said depression of said operating plate; a film sensitivity indicating means integrally formed in said film magazine, said sensing finger moving until coming into engagement with said film sensitivity indicating means in response to said release of said sensing plate; a light value control member being movable by said sensing plate upon said release of said locking, so as to control incident intensity of radiation to a photoelectric element; a rocking lever and a spring biasing said rocking lever, said rocking lever being pivotally connected to said operating plate at one end thereof and being normally engaged with said sensing plate, at the opposite end thereof by the force of said spring, wherein the biasing force of said sensing plate is smaller than that of said rocking lever.
Claim 12
Independent Claim
182 words
A device for automatically setting film sensitivity in a camera, comprising an operating plate being depressible by a film magazine as the film magazine is inserted in the body of the camera; a sensing plate having a sensing finger and being normally locked, said sensing plate being released from said locking in response to said depression of said operating plate; a film sensitivity indicating means integrally formed in said film magazine, said sensing finger moving until coming into engagement with said film sensitivity indicating means in response to said release of said sensing plate; a light value control member being movable by said sensing plate upon said release of said locking, so as to control incident intensity of radiation to a photoelectric element; a rocking lever and a spring biasing said rocking lever, said rocking lever being pivotally connected to said operating plate at one end thereof and being normally engaged with said sensing plate, at the opposite end thereof by the force of said spring, wherein the biasing force of said sensing plate is smaller than that of said rocking lever.
Claim 13
Dependent Claim
70 words
A device for automatically setting film sensitivity in a camera as set forth in claim 8, wherein said film sensitivity indicating means is an indicating notch being adjustable in accordance with the sensitivity of the film loaded in said film magazine, and said sensing finger moves along a slot formed in a partition wall of the camera body until coming Into engagement with said indicating notch of said film magazine.
Claim 14
Dependent Claim
46 words
A device for automatically setting film sensitivity in a camera as set forth in claim 9, wherein said sensing finger enters into said indicating notch of said film magazine before the tip of said operating plate is depressed by the front surface of said film magazine.
Claim 15
Dependent Claim
37 words
A device for automatically setting film sensitivity in a camera as set forth in claim 8, wherein said light value control member for controlling the incident intensity of radiation is formed by a variable light attenuating member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |