US3843249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exposure correction factor setting indicator for cameras
Assignee: Minolta Co Ltd
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Filing: 1973-12-28
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Granted: 1974-10-22
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Expires: 1993-12-28
Abstract
Abstract An exposure correction factor setting indicator for a light intensity measuring circuit and in particular, such a circuit adapted for use with a camera, is disclosed as comprising a plurality of light emitting elements, one of which is to be actuated in accordance with the intensity of the measured light, a pulse generator for producing a pulse of a period corresponding to the ON-OFF period of the light emitting elements, a switching circuit responsive to the pulses derived from the pulse generator to energize a selected one of the light emitting elements, and a changeover means operative in a first, normal mode wherein the pulses of the pulse generator are not applied to the switching circuit and in a second mode wherein the pulses are applied to the switching circuit to turn OFF and ON the selected radiation emitting element thereby to indicate that the exposure rate setting indicator is set at a value other than normal. The changeover circuit includes a variable resistive element coupled to a manually actuated member set according to the desired exposure rate. The variable resistive element is incorporated into the light measuring circuit to vary its output according to the set value of exposure rate.
Inventors
- 👤 M Kitaura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:54
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
196 words
An exposure correction factor setting indicator for cameras of the type having a digital exposure value indicator unit for indicating the exposure value in a digital form by means of light emitting elements, in which at least one light emitting element is selectively lighted to indicate a corresponding error correction factor and when the exposure correction factor is set at a value other than a normal value, said at least light emitting element corresponding to that value is intermittently turned on and off to indicate an unusual exposure correction factor setting, said indicator comprising: a. a pulse generator circuit for producing a pulse of a period corresponding to the ON-OFF period of the light emitting elements; b. a switching circuit connected between the light emitting elements and a power source, and controlled by the pulse derived from said pulse generator circuit; and c. changeover means ganged with an exposure correction factor setting member for disposing said switching circuit in a condition to be switched on and off in accordance with the pulses derived from said pulse generator circuit when the exposure rate of the exposure rate setting member is set at a value other than normal.
Claim 2
Dependent Claim
196 words
An exposure correction factor setting indicator for cameras of the type having a digital exposure value indicator unit for indicating the exposure value in a digital form by means of light emitting elements, in which at least one light emitting element is selectively lighted to indicate a corresponding error correction factor and when the exposure correction factor is set at a value other than a normal value, said at least light emitting element corresponding to that value is intermittently turned on and off to indicate an unusual exposure correction factor setting, said indicator comprising: a. a pulse generator circuit for producing a pulse of a period corresponding to the ON-OFF period of the light emitting elements; b. a switching circuit connected between the light emitting elements and a power source, and controlled by the pulse derived from said pulse generator circuit; and c. changeover means ganged with an exposure correction factor setting member for disposing said switching circuit in a condition to be switched on and off in accordance with the pulses derived from said pulse generator circuit when the exposure rate of the exposure rate setting member is set at a value other than normal.
Claim 3
Dependent Claim
31 words
An exposure correction factor setting indicator according to claim 1, wherein said switching circuit is disposed in its ON state when the exposure correction factor is set at a normal value.
Claim 4
Dependent Claim
19 words
An exposure correction factor setting indicator according to claim 1, wherein said switching circuit includes at least one transistor.
Claim 5
Dependent Claim
44 words
An exposure correction factor setting indicator according to claim 1, wherein said exposure correction factor setting member is included in a light measuring circuit of the camera and comprises a variable resistor for adjusting the value of the output of the light measuring circuit.
Claim 6
Dependent Claim
156 words
An exposure correction factor setting indicator adapted for use with a light measuring circuit, said indicator comprising: a. a display comprising a plurality of light emitting elements; b. a pulse generator circuit for producing a pulse having a period corresponding to the ON-OFF period of the light emitting elements; c. switch means connected for energizing said display intermittently under the control of the pulses derived from said pulse generator circuit; and d. changeover means operative in a first mode for disconnecting said pulse generator circuit from said switch means whereby the output of the light measuring circuit energizes steadily one of said light emitting elements in accordance with the intensity of the measured light, and in a second mode wherein the pulses of said pulse generator circuit are applied to said switching circuit to intermittently energize one of said light emitting elements indicating that the exposure correction factor is set at a value other than normal.
Claim 7
Dependent Claim
156 words
An exposure correction factor setting indicator adapted for use with a light measuring circuit, said indicator comprising: a. a display comprising a plurality of light emitting elements; b. a pulse generator circuit for producing a pulse having a period corresponding to the ON-OFF period of the light emitting elements; c. switch means connected for energizing said display intermittently under the control of the pulses derived from said pulse generator circuit; and d. changeover means operative in a first mode for disconnecting said pulse generator circuit from said switch means whereby the output of the light measuring circuit energizes steadily one of said light emitting elements in accordance with the intensity of the measured light, and in a second mode wherein the pulses of said pulse generator circuit are applied to said switching circuit to intermittently energize one of said light emitting elements indicating that the exposure correction factor is set at a value other than normal.
Claim 8
Dependent Claim
59 words
An exposure correction factor setting indicator as claimed in claim 5, wherein said changeover means comprises a member manually set according to the desired exposure correction factor, and a variable impedance element coupled thereto and inserted within the light measuring circuit to adjust the output of the light measuring circuit in accordance with the setting of said setting member.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |