US3760700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-lens reflex camera
Assignee: Individual
•
Filing: 1971-12-14
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Granted: 1973-09-25
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Expires: 1991-12-14
Abstract
Abstract A single lens reflex camera having within its housing a viewfinder which includes an image erecting system, an image field lens and an eyepiece. The camera is provided with a grey wedge having various values of grey situated in the housing adjacent an image erecting surface of the erecting system. A light guiding member positioned on the image erecting surface directs light from the subject through the grey wedge into the eyepiece. Exposure factor setting elements are coupled with an indicating device which is movable along the grey wedge by adjustment of the setting means. The illuminated wedge and indicator is visible in the viewfinder to enable setting for accurate exposure.
Inventors
- 👤 W Hahn
- 👤 H Tillig
- 👤 W Trankner
- 👤 E Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:37
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G03B7/00; G03B7/08; G03B7/099
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
In a single lens reflex camera having a housing enclosing a viewfinder which includes an image erecting system having an image erecting surface, an image field lens and an eyepiece, wherein the improvement comprises: a. a grey wedge having various values of grey, situated in the camera housing adjacent the image erecting surface, b. light guiding means positioned on the image erecting surface for directing light from the subject through the grey wedge and into the eyepiece; c. exposure factor setting means positioned on the camera housing; d. indicating means movable along the grey wedge and e. means for coupling the indicating means to the exposure factor setting means to effect movement of the indicating means in response to operation of the exposure factor setting means, whereby the illuminated wedge and indicating means is visible in the viewfinder.
Claim 2
Dependent Claim
138 words
In a single lens reflex camera having a housing enclosing a viewfinder which includes an image erecting system having an image erecting surface, an image field lens and an eyepiece, wherein the improvement comprises: a. a grey wedge having various values of grey, situated in the camera housing adjacent the image erecting surface, b. light guiding means positioned on the image erecting surface for directing light from the subject through the grey wedge and into the eyepiece; c. exposure factor setting means positioned on the camera housing; d. indicating means movable along the grey wedge and e. means for coupling the indicating means to the exposure factor setting means to effect movement of the indicating means in response to operation of the exposure factor setting means, whereby the illuminated wedge and indicating means is visible in the viewfinder.
Claim 3
Dependent Claim
32 words
In a camera according to claim 1 including a measurement aperture in the camera body through which light from the subject passes to the light guiding means for illuminating the grey wedge.
Claim 4
Dependent Claim
56 words
A camera according to claim 2 wherein the image erecting system is a pentaprism having a light entry surface and the light guiding means has first reflecting positioned to rEflect light from the measurement aperture through the grey wedge and second reflecting means positioned to direct light from the grey wedge into the light entry surface.
Claim 5
Dependent Claim
27 words
In a camera according to claim 1 including means for diverting light from the image erecting system to the light guiding means for illuminating the grey wedge.
Claim 6
Dependent Claim
91 words
A camera according to claim 4 wherein the image erecting system is a pentaprism having a light entry surface, and a reflective image erecting surface, the means for diverting light includes a non reflective portion on the image erecting surface through which light from the subject passes to the light guiding means, and the light guiding means has first reflecting means positioned adjacent the non reflective portion to direct light through the grey wedge and second reflecting means positioned to direct light from the grey wedge into the light entry surface.
Claim 7
Dependent Claim
27 words
A camera according to claim 1 wherein the exposure factor setting means comprises a plurality of setting rings mounted on the housing for setting individual exposure factors.
Claim 8
Dependent Claim
19 words
A camera according to claim 1 wherein the setting means is coupled with the indicating means via a cable.
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |