US3751151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio visual display apparatus
Assignee: Hoffman Electronics Corp
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Filing: 1971-03-01
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Granted: 1973-08-07
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Expires: 1991-03-01
Abstract
Abstract An audio and visual display apparatus which utilizes a cartridge having one or more picture transparencies surrounded by a rotatable recording disc including a drive track on one side and a sound track on the opposite side, the cartridge being insertable in a projector with the transparency in alignment with the optical axis of the projector. A drive wheel engages the drive track at three spaced points to maintain a predetermined azimuth relation between the sound track and the sensing element of a cooperating sound pickup unit. The rotatable recording disc of one embodiment having a mounting means so arranged as to permit translatory movement as well as rotary movement with respect to the transparency.
Inventors
- 👤 T Petterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:55
CPC Classifications
G; G03; G03B; G03B31/00; G03B31/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
An audio reproducing disc for insertion in a drive mechanism including a drive wheel, means for rotating the drive wheel, a backup means confronting the drive wheel and an audio pickup means, the disc being insertable between the drive wheel and backup means, and for rotation, and comprising: a. a spiral audio track on the disc for cooperation with the audio pickup means; b. and a spiral drive groove formed in the disc corresponding in pitch to the spiral audio track; c. the drive groove dimensioned to receive the marginal portion of the drive wheel for contact therewith at three spaced points including a first point at the radially inner side of the groove engaging one side of the drive wheel, and a pair of points at the radially outer side of the groove spaced circumferentailly from the first point and engaging the other side of the drive wheel thereby to restrain the disc against angular displacement relative to the rotational axis of the drive wheel, and also to restrain the audio track against corresponding angular displacement.
Claim 2
Dependent Claim
177 words
An audio reproducing disc for insertion in a drive mechanism including a drive wheel, means for rotating the drive wheel, a backup means confronting the drive wheel and an audio pickup means, the disc being insertable between the drive wheel and backup means, and for rotation, and comprising: a. a spiral audio track on the disc for cooperation with the audio pickup means; b. and a spiral drive groove formed in the disc corresponding in pitch to the spiral audio track; c. the drive groove dimensioned to receive the marginal portion of the drive wheel for contact therewith at three spaced points including a first point at the radially inner side of the groove engaging one side of the drive wheel, and a pair of points at the radially outer side of the groove spaced circumferentailly from the first point and engaging the other side of the drive wheel thereby to restrain the disc against angular displacement relative to the rotational axis of the drive wheel, and also to restrain the audio track against corresponding angular displacement.
Claim 3
Dependent Claim
33 words
A disc, as defined in claim 1, including: a. means for carrying a transparency in essentially coplanar relation to the audio reproducing disc, and permitting rotation of the disc relative to the transparency.
Claim 4
Dependent Claim
37 words
A disc, as defined in claim 2, wherein: a. the transparency carrying means includes guide means to permit translatory movement of the audio reproducing disc as well as rotational movement thereof relative to the transpaRency carrying means.
Claim 5
Dependent Claim
147 words
An audio reproducing apparatus, comprising: a. an audio reproducing disc having a spiral audio track on one side and a corresponding spiral drive groove on the opposite side; b. an audio pickup means cooperating with the audio track; c. a drive wheel having a tapered margin received in the drive groove; d. a shaft for the drive wheel disposed in radial relation to the disc; e. carrier means for supporting the shaft and the pickup means for radial movement in unison with respect to the disc; f. the drive groove having side walls of lesser taper than the margin of the drive wheel, and proportioned with respect to the drive wheel to contact the drive wheel on opposite sides thereof and at three spaced points to restrain the drive wheel and the pickup means against angular movement with respect to the axis of the drive wheel shaft.
Claim 6
Dependent Claim
147 words
An audio reproducing apparatus, comprising: a. an audio reproducing disc having a spiral audio track on one side and a corresponding spiral drive groove on the opposite side; b. an audio pickup means cooperating with the audio track; c. a drive wheel having a tapered margin received in the drive groove; d. a shaft for the drive wheel disposed in radial relation to the disc; e. carrier means for supporting the shaft and the pickup means for radial movement in unison with respect to the disc; f. the drive groove having side walls of lesser taper than the margin of the drive wheel, and proportioned with respect to the drive wheel to contact the drive wheel on opposite sides thereof and at three spaced points to restrain the drive wheel and the pickup means against angular movement with respect to the axis of the drive wheel shaft.
Claim 7
Dependent Claim
43 words
An apparatus as described in claim 4, including: a visual reproducing transparency; b. a mounting means disposing the transparency in essentially coplanar relation with the audio reproducing disc; c. and means for restraining the mounting means during rotation of the audio reproducing disc.
Claim 8
Dependent Claim
57 words
An apparagus as described in claim 4, including: a. a visual reproducing transparency; b. a mounting means for securing the transparency against movement, the mounting means also supporting the audio reproducing disc to permit both rotational and translatory movement relative to the transparency; c. said drive wheel, on rotating the disc, causing a corresponding translatory movement thereof.
Claim 9
Dependent Claim
65 words
An apparatus as described in claim 4, including: a. a ring of visual reproducing transparencies; b. a mounting means frictionally connected with the sound reproducing disc for rotation therewith, the mounting means including a spiral set of stops corresponding to the transparencies; c. and means radially movable with the carrier means to engage the stops in sequence thereby to restrain the transparencies for sequential viewing.
Claim 10
Dependent Claim
125 words
An audio reproducing apparatus, comprising: a. an audio reproducing disc having an arcuate audio track and a corresponding arcuate drive groove therein; b. an audio pickup means cooperating with the audio track; c. a drive wheel, when in operation, being in fixed relation to the audio pickup means and having a margin received in the drive groove; d. means for rotating the drive wheel to cause movement of the drive groove past the drive wheel; e. the drive groove and drive wheel being relatively proportioned whereby the drive groove contacts the drive wheel at a central point at one side thereof and at two arcuately spaced points at the opposite side thereof, thereby to maintain said audio track and audio pickup means in fixed position.
Claim 11
Dependent Claim
125 words
An audio reproducing apparatus, comprising: a. an audio reproducing disc having an arcuate audio track and a corresponding arcuate drive groove therein; b. an audio pickup means cooperating with the audio track; c. a drive wheel, when in operation, being in fixed relation to the audio pickup means and having a margin received in the drive groove; d. means for rotating the drive wheel to cause movement of the drive groove past the drive wheel; e. the drive groove and drive wheel being relatively proportioned whereby the drive groove contacts the drive wheel at a central point at one side thereof and at two arcuately spaced points at the opposite side thereof, thereby to maintain said audio track and audio pickup means in fixed position.
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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |