Patent US3832050A successfully refreshed from Google Patents.
US3832050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicating mechanism for a projection apparatus
Assignee: Braun GmbH
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Filing: 1972-02-07
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Granted: 1974-08-27
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Expires: 1992-02-07
Abstract
Abstract In a picture projection apparatus operable with an objective and an optical arrangement placed along an optical axis for projecting a picture placed between the objective and the optical arrangement the provision of an indicating mechanism including a pair of elongated flat indicating bars of a transparent material extending into the path of the light in a plane between the picture plane and the objective, the indicating mechanism including a drive arrangement for operating the indicating bars by causing each of the indicating bars to sweep the entire picture window area and for bringing the indicating devices to an intersection at any position over the picture area, the indicating bars carrrying a thin strip of less transparent material which during the intersection creates a darker field over the picture detail on the screen without covering such detail.
Inventors
- 👤 H Johannsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:59
CPC Classifications
G; G03; G03B; G03B21/00; G03B21/14; G03B21/26
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
240 words
In a picture projection apparatus operable with an objective and an optical arrangement placed along an optical axis for projecting a picture placed between the objective and the optical arrangement, the combination comprising an indicating mechanism including a pair of indicating means extending into the path of the light in a plane between the picture plane and the objective, said indicating mechanism comprising means for operating said indicating means by causing each of said indicating means to sweep the entire picture window area and for bringing said indicating means to an intersecting position at any point over said picture window, said operating means comprising an electromotor for driving said indicating means, said operating mechanism comprises a driving segment fixedly coupled to each of the pivoted end portions of said indicating means, a pendulum-like driving means comprising said electro-motor and a friction wheel, said pendulum-like driving means being pivotably mounted at one end thereof and being adapted to pivot said friction wheel thereon at an initial position into driving engagement with one of said segments associated with one of said indicating means, electromagnetic means mounted adjacent said pendulum-like driving means for causing, when energized, said pendulum-like driving means to move into engagement with the other one of said driving segments to cause movement of the associated indicating means into a desired indicating position over said picture area, and including releasable latching means for latching said indicating means in the indicating position.
Claim 2
Dependent Claim
240 words
In a picture projection apparatus operable with an objective and an optical arrangement placed along an optical axis for projecting a picture placed between the objective and the optical arrangement, the combination comprising an indicating mechanism including a pair of indicating means extending into the path of the light in a plane between the picture plane and the objective, said indicating mechanism comprising means for operating said indicating means by causing each of said indicating means to sweep the entire picture window area and for bringing said indicating means to an intersecting position at any point over said picture window, said operating means comprising an electromotor for driving said indicating means, said operating mechanism comprises a driving segment fixedly coupled to each of the pivoted end portions of said indicating means, a pendulum-like driving means comprising said electro-motor and a friction wheel, said pendulum-like driving means being pivotably mounted at one end thereof and being adapted to pivot said friction wheel thereon at an initial position into driving engagement with one of said segments associated with one of said indicating means, electromagnetic means mounted adjacent said pendulum-like driving means for causing, when energized, said pendulum-like driving means to move into engagement with the other one of said driving segments to cause movement of the associated indicating means into a desired indicating position over said picture area, and including releasable latching means for latching said indicating means in the indicating position.
Claim 3
Dependent Claim
32 words
The combination as claimed in claim 1, wherein said pendulum-like driving means has a spring means coupled thereto for returning said driving means into an initial position when said electro-magnet is deenergized.
Claim 4
Dependent Claim
117 words
The combination as claimed in claim 1, wherein said releasable latching mechanism comprises a toothed segment means fixedly mounted on said driviNg segment means, a ratchet means arranged for cooperation with each of said toothed segment means and thereby fixing said indicating means in the indicating position when said ratchet means engages said toothed segment means, a spring means biasing said ratchet means into engagement with said toothed segment means, an electro-magnet means operable, when energized, to release said ratchet means from engagement with said toothed segment, and a return spring means associated with each driving segment means for returning the associated indicating device into an initial position when said ratchet means disengages said toothed segment means.
Claim 5
Dependent Claim
54 words
The combination as claimed in claim 3, wherein said releasable latching means comprises a movable bar operable with said electro-magnet and having a camming arrangement thereon for engagement with an end portion of said ratchet means and moving said ratchet means out of engagement with said toothed segment means when said electromagnet is energized.
Claim 6
Dependent Claim
234 words
In a picture projection apparatus operable with an objective and an optical arrangement placed along an optical axis for projecting a picture placed between the objective and the optical arrangement, the combination comprising an indicating mechanism including a pair of elongated indicating means each pivotally mounted at one end and extending into the path of the light in a plane between the picture plane and the objective, said indicating mechanism comprising an electromotor for operating said indicating means by causing each of said indicating means to sweep the entire picture window area and for bringing said indicating means to an intersecting position at any point over said picture window, a driving segment fixedly coupled to each of the pivoted end portions of said indicating means, a pendulum-like balancing means comprising said electro-motor and a friction wheel, said pendulum-like balancing means being pivotably mounted at one end thereof and being adapted to pivot said friction wheel thereon at an initial position into driving engagement with one of said segments associated with one of said indicating means, electromagnetic means mounted adjacent said pendulum-like balancing means for causing, when energized, said pendulum-like balancing means to move into engagement with the other one of said driving segments to cause movement of the associated indicating means into a desired indicating position over said picture area, and including releasable latching means for latching said indicating means in the indicating position.
Claim 7
Dependent Claim
234 words
In a picture projection apparatus operable with an objective and an optical arrangement placed along an optical axis for projecting a picture placed between the objective and the optical arrangement, the combination comprising an indicating mechanism including a pair of elongated indicating means each pivotally mounted at one end and extending into the path of the light in a plane between the picture plane and the objective, said indicating mechanism comprising an electromotor for operating said indicating means by causing each of said indicating means to sweep the entire picture window area and for bringing said indicating means to an intersecting position at any point over said picture window, a driving segment fixedly coupled to each of the pivoted end portions of said indicating means, a pendulum-like balancing means comprising said electro-motor and a friction wheel, said pendulum-like balancing means being pivotably mounted at one end thereof and being adapted to pivot said friction wheel thereon at an initial position into driving engagement with one of said segments associated with one of said indicating means, electromagnetic means mounted adjacent said pendulum-like balancing means for causing, when energized, said pendulum-like balancing means to move into engagement with the other one of said driving segments to cause movement of the associated indicating means into a desired indicating position over said picture area, and including releasable latching means for latching said indicating means in the indicating position.
Claim 8
Dependent Claim
117 words
The combination as claimed in claim 5, wherein said releasable latching mechanism comprises a toothed segment means fixedly mounted on said driving segment means, a ratchet means arranged for cooperation with each of said toothed segment means and thereby fixing said indicating means in the indicating position when said ratchet means engages said toothed segment means, a spring means biasing said ratchet means into engagement with said toothed segment means, an electro-magnet means operable, when energized, to release said ratchet means from engagement with said toothed segment, and a return spring means associated with each driving segment means for returning the associated indicating device into an initial position when said ratchet means disengages said toothed segment means.
Claim 9
Dependent Claim
54 words
The combination as claimed in claim 6, wherein said releasable latching means comprises a movable bar operable with said electro-magnet and having a camming arrangement thereon for engagement with an end portion of said ratchet means and moving said ratchet means out of engagement with said toothed segment means when said electro-magnet is energized.
Claim 10
Dependent Claim
40 words
The combination as claimed in claim 5, wherein one of said indicating means is mounted for movement in the horizontal direction and the other of said indicating means is mounted for movement in the vertical direction over said picture surface.
Claim 11
Dependent Claim
30 words
The combination as claimed in claim 5, wherein means are provided for mOunting each of said indicating means at one end thereof for pivotably sweeping the entire picture area individually.
Claim 12
Dependent Claim
34 words
The combination as claimed in claim 5, wherein said indicating means are offset with respect to each other along the optical axis of said apparatus for clearing each other during intersection during said sweeping.
Claim 13
Dependent Claim
52 words
The combination as claimed in claim 5, wherein each of said indicating means comprises a flat elongated bar made from a fully transparent material at least at the portion thereof which sweeps the picture area, a strip means provided on each of said indicating means and made from a partially transparent material.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |