Mechanical assembly for audio-visual teaching machines
US4552535A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 18, 1984 |
| Grant date | Nov 12, 1985 |
| Priority date | — |
| Expiry date | May 18, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B5/067
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An improved audio-visual machine for projecting visual information segments carried by a transparency holder in an audio-visual cartridge, and for reproducing corresponding narrative and control information recorded on a movable storage medium carried by the cartridge, is disclosed. The teaching machine includes an optical system which incorporates a movable focusing lens which is mounted on a very long lever arm. The lever arm is pivoted at one end and is adjustably mounted on a threaded post at the other end to permit motion of the lens toward and away from the transparency for focusing while still permitting maintenance of the focus across the entire width of the transparency. A drive mechanism is provided to selectively align specified visual segments with the optical system. The movable storage medium is movable independently of the transparency holder, and a transducer for reproducing audio frequency signals from the storage medium is provided. The transducer includes an improved indexing assembly to permit precise location with respect to the storage medium. The entire mechanical assembly is mounted on a single mounting plate to facilitate assembly of the machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.