US4720718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflex camera
Assignee: Fujifilm Holdings Corp
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Filing: 1987-02-09
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Granted: 1988-01-19
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Expires: 2007-02-09
Abstract
Abstract A reflex camera having a reflex mirror and a light-blocking plate which are pivotally mounted for swinging movement so as to move between a viewing position and a photographing position. The reflex camera has a driving mechanism including an electric motor for causing the swing-up and -down movement of the reflex mirror and the light-blocking plate between the above-mentioned two positions, and a position-detecting device to detect the moved positions of the reflex mirror and the light blocking plate so as to control the speed of rotation of the electric motor according to the detected positions, thereby to prevent shocks and vibrations on the reflex mirror and the light-blocking plate.
Inventors
- 👤 Katsuhiko Yamamoto
- 👤 Takeshi Yoshino
- 👤 Masayoshi Hirai
- 👤 Shiro Hashimoto
- 👤 Michihiro Shiina
- 👤 Shigenori Goto
- 👤 Hisashi Hamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:56
CPC Classifications
G; G03; G03B; G03B19/00; G03B19/02; G03B19/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
132 words
A reflex camera having a reflex mirror and a light-blocking plate which are pivotally mounted in the reflex camera for swinging-up and -down movement between a viewing position and a photographic position, said reflex camera comprising: an electric motor disposed in said reflex camera; driving means coupled to said electric motor for rotary movement; interlocking means coupled between said driving means and both said reflex mirror and said light-blocking plate for sequentially swinging up and down said mirror and light-blocking plate between said two positions; position-detecting means for detecting rotated angular positions of said driving means to provide position signals as electric outputs; and means for controlling the rotation of said motor in accordance with said position signals, thereby to control said swinging-up and -down movement of said mirror and light-blocking plate.
Claim 2
Dependent Claim
132 words
A reflex camera having a reflex mirror and a light-blocking plate which are pivotally mounted in the reflex camera for swinging-up and -down movement between a viewing position and a photographic position, said reflex camera comprising: an electric motor disposed in said reflex camera; driving means coupled to said electric motor for rotary movement; interlocking means coupled between said driving means and both said reflex mirror and said light-blocking plate for sequentially swinging up and down said mirror and light-blocking plate between said two positions; position-detecting means for detecting rotated angular positions of said driving means to provide position signals as electric outputs; and means for controlling the rotation of said motor in accordance with said position signals, thereby to control said swinging-up and -down movement of said mirror and light-blocking plate.
Claim 3
Dependent Claim
71 words
A reflex camera as defined in claim 1, said positioning-detecting means provides at least three position signals, namely a first position signal at the end of swinging-up movement of said mirror to said photographing position, a second position signal at the end of swinging-up movement of said light-blocking plate to said photographing position, and a third position signal at the end of swinging-down movement of said mirror to said viewing position.
Claim 4
Dependent Claim
38 words
A reflex camera as defined in claim 1, wherein said position-detecting means comprises a member attached to said driving means at a particular angular position thereof and means stationarily disposed in said reflex camera for sensing said member.
Claim 5
Dependent Claim
46 words
A reflex camera as defined in claim 1, wherein said position-detecting means comprises a sector member having a leading and a trailing edge which is attached to said driving means and two position sensors which are actuated by said sector member to provide said position signals.
Claim 6
Dependent Claim
24 words
A reflex camera as defined in claim 4, wherein said sector member is a light-reflective plate and said position sensor is a reflection-type photosensor.
Claim 7
Dependent Claim
94 words
A reflex camera having a reflex mirror and a light-blocking plate which are pivotally mounted in the reflex camera for swinging-up and -down movement between a viewing position and a photograhing position, said reflex camera comprising; driving means including an electric motor for swinging up and down said reflex mirror and said light-blocking plate sequentially; and control means for maintaining a driving voltage supplied to said electric motor lower upon the swinging-up movement of said reflex mirror to said photographing position than upon the swinging-up movement of said light-blocking plate to said photographing position.
Claim 8
Dependent Claim
94 words
A reflex camera having a reflex mirror and a light-blocking plate which are pivotally mounted in the reflex camera for swinging-up and -down movement between a viewing position and a photograhing position, said reflex camera comprising; driving means including an electric motor for swinging up and down said reflex mirror and said light-blocking plate sequentially; and control means for maintaining a driving voltage supplied to said electric motor lower upon the swinging-up movement of said reflex mirror to said photographing position than upon the swinging-up movement of said light-blocking plate to said photographing position.
Claim 9
Dependent Claim
30 words
A reflex camera as defined in claim 6, wherein said voltage upon the swinging-up movement of said light-blocking plate gradually increases to and is thereafter kept at a predetermined level.
Claim 10
Dependent Claim
35 words
A reflex camera as defined in claim 6, wherein said voltage supplied to said motor is cut off before swinging up said light-blocking plate after having swung up said reflex mirror to said viewing position.
Claim 11
Dependent Claim
178 words
A reflex camera having a reflex mirror and a light-blocking plate which are pivotally mounted therein for swinging-up and -down movement between a viewing position and a photographing position, said reflex camera comprising: driving means including an electric motor for swinging up and down said mirror and said light-blocking plate sequentially; and means for controlling a driving voltage supplied to said electric motor in such a way that said driving voltage is gradually increased to and kept at a predetermined level of voltage during swinging up said mirror from said viewing position to said photographing position, and so that said driving voltage is then cut off for a predetermined period of time upon having swung said mirror up to said photographing position and so that said driving voltage is gradually increased again to and kept at a predetermined level of voltage after said predetermined period of time during swinging up said light-blocking plate from said viewing position to said photographing position, and so that said driving voltage is cut off again upon having swung up said light-blocking plate.
Claim 12
Dependent Claim
178 words
A reflex camera having a reflex mirror and a light-blocking plate which are pivotally mounted therein for swinging-up and -down movement between a viewing position and a photographing position, said reflex camera comprising: driving means including an electric motor for swinging up and down said mirror and said light-blocking plate sequentially; and means for controlling a driving voltage supplied to said electric motor in such a way that said driving voltage is gradually increased to and kept at a predetermined level of voltage during swinging up said mirror from said viewing position to said photographing position, and so that said driving voltage is then cut off for a predetermined period of time upon having swung said mirror up to said photographing position and so that said driving voltage is gradually increased again to and kept at a predetermined level of voltage after said predetermined period of time during swinging up said light-blocking plate from said viewing position to said photographing position, and so that said driving voltage is cut off again upon having swung up said light-blocking plate.
Claim 13
Dependent Claim
98 words
A reflex camera having a reflex mirror which is pivotally mounted therein for swinging-up and -down movement between a viewing position and a photographing position, said reflex camera comprising: driving means including an electric motor for causing said swinging-up and -down movement; and control means for decreasing gradually a driving voltage supplied to said electric motor to and keeping it at a predetermined level of voltage during said swinging-down movement of said mirror from said photographing position to said viewing position, and then cutting off said driving voltage at the end of said swinging-down movement of said mirror.
Claim 14
Dependent Claim
98 words
A reflex camera having a reflex mirror which is pivotally mounted therein for swinging-up and -down movement between a viewing position and a photographing position, said reflex camera comprising: driving means including an electric motor for causing said swinging-up and -down movement; and control means for decreasing gradually a driving voltage supplied to said electric motor to and keeping it at a predetermined level of voltage during said swinging-down movement of said mirror from said photographing position to said viewing position, and then cutting off said driving voltage at the end of said swinging-down movement of said mirror.
References Cited (Backward Citations)
US4443083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-18 | 1991-07-20 | 1992-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-18 | 1995-07-20 | 1996-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-18 | 1999-07-20 | 2000-01-19 | $7700.00 | Window Closed / Lapsed |