Лазерлік пластинка ойнатқыш: жаңа технология мен тарихы

Turntable that plays records using laser beams

A laser turntable (or optical turntable) is a phonograph that plays standard LP records (and other gramophone records) using laser beams as the pickup instead of using a stylus as in conventional turntables. Although these turntables use laser pickups, the same as Compact Disc players, the signal remains in the analog realm and is never digitized.

William K. Heine presented a paper "A Laser Scanning Phonograph Record Player" to the 57th Audio Engineering Society (AES) convention in May 1977. The paper details a method developed by Heine that employs a single 2.2 mW helium–neon laser for both tracking a record groove and reproducing the stereo audio of a phonograph in real time. In development since 1972, the working prototype was named the "LASERPHONE", and the methods it used for playback was awarded U. S. Patent 3,992,593 on 16 November 1976. Heine concluded in his paper that he hoped his work would increase interest in using lasers for phonographic playback.

Four years later in 1981 Robert S. Reis, a graduate student in engineering at Stanford University, wrote his master's thesis on "An Optical Turntable". In 1983 he and fellow Stanford electrical engineer Robert E. Stoddard founded Finial Technology to develop and market a laser turntable, raising $7 million in venture capital. In 1984 servo control expert Robert N. Stark joined the effort. A non functioning mock up of the proposed Finial turntable was shown at the 1984 Consumer Electronics Show (CES), generating much interest and a fair amount of mystery, since the patents had not yet been granted and the details had to be kept secret. The first working model, the Finial LT 1 (Laser Turntable 1), was completed in time for the 1986 CES. The prototype revealed an interesting flaw of laser turntables: they are so accurate that they "play" every particle of dirt and dust on the record, instead of pushing them aside as a conventional stylus would. The non contact laser pickup does have the advantages of eliminating record wear, tracking noise, turntable rumble and feedback from the speakers, but the sound is still that of an LP turntable rather than a Compact Disc. The projected $2,500 street price (later raised to $3,786 in 1988) limited the potential market to professionals (libraries, radio stations and archivists) and a few well heeled audiophiles. The Finial turntable never went into production. After Finial showed a few hand built (and finicky) prototypes, tooling delays, component unavailability (in the days before cheap lasers), marketing blunders, and high development costs kept pushing back the release date. The long development of the laser turntable exactly coincided with two major events, the early 1980s recession, and the introduction of the Digital Compact Disc, which soon began flooding the market at prices comparable to LPs (with CD players in the $300 range). Vinyl record sales plummeted, and many established turntable manufacturers went out of business as a result. With over US$20 million in venture capital invested, Finial faced a marketing dilemma: forge ahead with a selling price that would be too high for most consumers, or gamble on going into mass production at a much lower price and hope the market would lower costs. Neither seemed viable in a rapidly shrinking market.

Finally, in late 1989 after almost seven years of research, Finial's investors cut their losses and liquidated the firm, selling the patents to Japanese turntable maker CTI Japan, which in turn created ELP Japan for continued development of the "super audiophile" turntable. After eight more years of development the laser turntable was finally put on sale in 1997 – twenty years after the initial proposal – as the ELP LT 1XA Laser Turntable, with a list price of US$20,500 (in 2003 the price was lowered to US$10,500). The turntable, which uses two lasers to read the groove and three more to position the head, does allow one to vary the depth at which the groove is read, possibly bypassing existing record wear. It will not, however, read clear or colored vinyl records. ELP sells built to order laser turntables directly to consumers in two versions (LT basic, and LT master), at a reported cost (unpublished) of approximately $16,000 for the basic model.

In May 2018, Almedio of Japan, a computer drive manufacturer, presented the Optora ORP 1 optical (laser) turntable at the HIGH END Munich audio show. Few details were provided by the company because, like the 1984 presentation of the Finial turntable, the Optora was a non working mockup. Company representatives indicated the turntable would use five lasers and be belt driven, like the ELP. However, after producing some promotional materials (since deleted), a price was never announced and the Optora has not been put on the market. The company's website devoted to the turntable has since been deleted.