US3741089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for operating main switch of exposure indicating circuit in camera
Assignee: Minolta Co Ltd
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Filing: 1971-12-09
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Granted: 1973-06-26
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Expires: 1991-12-09
Abstract
Abstract A detecting member for detecting that an exposure control member is in operation keeps the main switch of an exposure indicating circuit closed to energize the indicating circuit while the amount of exposure is being controlled. Upon completion of exposure control, the detecting member opens the switch to deenergize the indicating circuit independently of the action of the shutter.
Inventors
- 👤 Y Takada
- 👤 M Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:02
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/02; G03B9/00; G03B9/58
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
A light measuring mechanism in a camera comprising: a light measuring system including a photocell exposed to incident light; means including a knob rotatable about a longitudinal axis for adjusting a parameter of said light measuring system; a current source for energizing said light measuring system; means including a normally open switch for connecting said light measuring system to said current source; and a switch actuating member positioned proximate said knob and being transversely movable by a finger relative to said longitudinal axis between a depressed position closing said switch to energize said light measuring system and simultaneously render said knob operable by said finger and a retracted position effecting the opening of said switch whereby said switch actuating member is depressed and retracted simultaneously with the engagement and disengagement of said knob by said finger for adjustment of said knob.
Claim 2
Dependent Claim
141 words
A light measuring mechanism in a camera comprising: a light measuring system including a photocell exposed to incident light; means including a knob rotatable about a longitudinal axis for adjusting a parameter of said light measuring system; a current source for energizing said light measuring system; means including a normally open switch for connecting said light measuring system to said current source; and a switch actuating member positioned proximate said knob and being transversely movable by a finger relative to said longitudinal axis between a depressed position closing said switch to energize said light measuring system and simultaneously render said knob operable by said finger and a retracted position effecting the opening of said switch whereby said switch actuating member is depressed and retracted simultaneously with the engagement and disengagement of said knob by said finger for adjustment of said knob.
Claim 3
Dependent Claim
27 words
The mechanism of claim 1 wherein said light measuring system includes an adjustable diaphragm disposed forwardly of said photocell and responsive to the rotation of said knob.
Claim 4
Dependent Claim
33 words
The mechanism of claim 2 wherein said switch actuating member includes a finger piece projecting transversely beyond the outer periphery of said knob when said switch actuating member is in its retracted position.
Claim 5
Dependent Claim
15 words
The mechanism of claim 3 wherein said finger piece includes a curved convex outer edge.
Claim 6
Dependent Claim
17 words
The mechanism of claim 3 including spring means urging said switch actuating member to its retracted position.
Claim 7
Dependent Claim
135 words
In a camera including a body, an exposure measuring system including a photocell for indicating a proper exposure value in response to the amount of light received by said photocell, a rotatable exposure control member, a portion of the outer circumference of said exposure control member projecting from the camera body and being rotatably manipulatable by one finger; a spring raised depressible lever member with a free end portion which is disposed close to said projecting portion of said exposure control member; and is depressed by said one finger during manipulation of said control member and means for energizing said network including a normally open switch which is closed by the depression of said lever member to energize said network and is released to open position upon release of said lever to deenergize said network.
Claim 8
Dependent Claim
135 words
In a camera including a body, an exposure measuring system including a photocell for indicating a proper exposure value in response to the amount of light received by said photocell, a rotatable exposure control member, a portion of the outer circumference of said exposure control member projecting from the camera body and being rotatably manipulatable by one finger; a spring raised depressible lever member with a free end portion which is disposed close to said projecting portion of said exposure control member; and is depressed by said one finger during manipulation of said control member and means for energizing said network including a normally open switch which is closed by the depression of said lever member to energize said network and is released to open position upon release of said lever to deenergize said network.
Claim 9
Dependent Claim
57 words
The device as set forth in claim 6 wherein the other end of said lever member is pivoted in said camera body, and said lever free end portion is spring biased so as to be positioned higher than said outer circumference of said exposure control member when said free end portion is retracted from its depressed position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |