US5053803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Information display apparatus for camera
Assignee: Canon Inc
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Filing: 1990-02-15
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Granted: 1991-10-01
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Expires: 2010-02-15
Abstract
Abstract A camera body includes a movable main mirror for reflecting a light beam emerging from an objective lens, an optical element arranged along a reflection optical path of the movable main mirror and near a predetermined imaging plane of the objective lens, and having a plurality of micro refracting elements forming a display character, an eyepiece, a prism for deflecting the reflection optical path toward the eyepiece, and an illumination source, arranged in front of the prism, for causing the movable main mirror to reflect an illumination light beam to illuminate the display character.
Inventors
- 👤 Yasuo Suda
- 👤 Kenji Ito
- 👤 Keiji Ohtaka
- 👤 Kenji Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:04
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/18; G03B17/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
94 words
An information observation apparatus in which a fresnel lens is arranged near a predetermined imaging plane on which an object image is formed by an objective lens, an optical element having a display character constituted by a plurality of microprisms is arranged near said fresnel lens, and said display character is illuminated by illumination means and is observed together with the object image formed by said objective lens, wherein ridgelines of said microprisms constituting said display character are arranged to be substantially perpendicular to a tangential direction of a ridgeline of said fresnel lens.
Claim 2
Dependent Claim
94 words
An information observation apparatus in which a fresnel lens is arranged near a predetermined imaging plane on which an object image is formed by an objective lens, an optical element having a display character constituted by a plurality of microprisms is arranged near said fresnel lens, and said display character is illuminated by illumination means and is observed together with the object image formed by said objective lens, wherein ridgelines of said microprisms constituting said display character are arranged to be substantially perpendicular to a tangential direction of a ridgeline of said fresnel lens.
Claim 3
Dependent Claim
19 words
An apparatus according to claim 1, wherein said optical element has display characters at a plurality of different positions.
Claim 4
Dependent Claim
17 words
An apparatus according to claim 2, wherein said illumination means illuminates said plurality of display characters selectively.
Claim 5
Dependent Claim
93 words
A camera body comprising: a movable main mirror for reflecting a light beam emerging from an objective lens; an optical element arranged along a reflection optical path of said movable main mirror and near a predetermined imaging plane of said objective lens, and having a plurality of micro refracting elements forming a display character; an eyepiece; a prism for deflecting the reflection optical path toward said eyepiece; and illumination means, arranged in front of said prism, for causing said movable main mirror to reflect an illumination light beam to illuminate said display character.
Claim 6
Dependent Claim
93 words
A camera body comprising: a movable main mirror for reflecting a light beam emerging from an objective lens; an optical element arranged along a reflection optical path of said movable main mirror and near a predetermined imaging plane of said objective lens, and having a plurality of micro refracting elements forming a display character; an eyepiece; a prism for deflecting the reflection optical path toward said eyepiece; and illumination means, arranged in front of said prism, for causing said movable main mirror to reflect an illumination light beam to illuminate said display character.
Claim 7
Dependent Claim
31 words
A camera body according to claim 4, wherein said optical element has display characters at a plurality of different positions, and said illumination means selectively illuminates one of said display characters.
Claim 8
Dependent Claim
85 words
A camera body according to claim 4, further comprising: a focus detector for detecting a focusing state of said objective lens; and a sub mirror for deflecting a light beam passing through said movable main mirror toward said focus detector, wherein a point where the center of a light beam illuminating said display character is reflected by said movable main mirror is separated from a point where the center of the light beam passing through said objective lens is reflected by said movable main mirror.
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JPH01277225A
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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) | 1994-09-30 | 1995-04-01 | 1995-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-30 | 1999-04-01 | 1999-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-30 | 2003-04-01 | 2003-10-01 | $7700.00 | Window Closed / Lapsed |