Patent EP0436174A2 successfully refreshed from Google Patents.
Patent US3728951A successfully refreshed from Google Patents.
US3728951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for illuminating indicia in the viewfinder of a camera
Assignee: Nikon Corp
•
Filing: 1971-03-23
•
Granted: 1973-04-24
•
Expires: 1991-03-23
Abstract
Abstract In a single lens reflex camera having a pre-set diaphragm, means is provided for illuminating the indicia found on the viewfinder. The illuminating means includes a light source, and a set of switches associated with a manually operable member so as to activate and deactivate the light source in response to the operation of the operable member.
Inventors
- 👤 H Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:26
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12; G03B13/00; G03B13/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
In a single lens reflex camera having an automatic diaphragm, the combination comprising: a viewfinder; a scale device disposed in said view finder, said scale device being observed through said viewfinder and illuminated with part of the light passing through the objective lens; a manually operable member connected to said automatic preset diaphragm for stopping down the diaphragm to a preset f-value during operation of said manually operable member; electrically illuminating means associated with said manually operable member to illuminate said scale device during operation of said manually operable member; wherein said electrically illuminating means includes a circuit having a lamp, a source of electric potential, a pair of switch members and connections for connecting the lamp and said switch members to said source, said switch members being associated with said manually operable member for closing the circuit to turn on said lamp during operation of said manually operable member and opening the circuit to turn off the lamp while the operable member is inoperative.
Claim 2
Dependent Claim
165 words
In a single lens reflex camera having an automatic diaphragm, the combination comprising: a viewfinder; a scale device disposed in said view finder, said scale device being observed through said viewfinder and illuminated with part of the light passing through the objective lens; a manually operable member connected to said automatic preset diaphragm for stopping down the diaphragm to a preset f-value during operation of said manually operable member; electrically illuminating means associated with said manually operable member to illuminate said scale device during operation of said manually operable member; wherein said electrically illuminating means includes a circuit having a lamp, a source of electric potential, a pair of switch members and connections for connecting the lamp and said switch members to said source, said switch members being associated with said manually operable member for closing the circuit to turn on said lamp during operation of said manually operable member and opening the circuit to turn off the lamp while the operable member is inoperative.
Claim 3
Dependent Claim
34 words
A single lens reflex camera according to claim 1 which additionally comprises a reflecting mirror which directs part of the light passing through said objective lens and from the light source to said scale.
Claim 4
Dependent Claim
16 words
The combination according to claim 1, wherein said scale device has f-values and shutter speed values.
Claim 5
Dependent Claim
23 words
The combination according to claim 1, wherein said viewfinder includes a focusing screen, and the scale device is disposed on said focusing screen.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |