US655480A - Phonographic reproducing device. - Google Patents

Phonographic reproducing device. Download PDF

Info

Publication number
US655480A
US655480A US1535100A US1900015351A US655480A US 655480 A US655480 A US 655480A US 1535100 A US1535100 A US 1535100A US 1900015351 A US1900015351 A US 1900015351A US 655480 A US655480 A US 655480A
Authority
US
United States
Prior art keywords
disk
reproducing
record
reproducer
curve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US1535100A
Inventor
Thomas A Edison
Original Assignee
Thomas A Edison
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Thomas A Edison filed Critical Thomas A Edison
Priority to US1535100A priority Critical patent/US655480A/en
Application granted granted Critical
Publication of US655480A publication Critical patent/US655480A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/44Styli, e.g. sapphire, diamond
    • G11B3/46Constructions or forms Disposition or mounting, e.g. attachment of point to shank

Description

No. 655,480. Patented Aug. 7, I900. T. A. EDISON.

puonoemwmc mapnouucms DEVICE.

(Application filed my 3, 1900.)

(N0 Iodel.)

Inventor Attys.

m: Noam: mans co., mercy-mo" NASHINGYDN. n. c.

UNITED STATES,

PATENT OFFICE.

THOMAS A. EDISON, OF LLEWELLYN PARK, NEW JERSEY.

PHONOGRAPHIC REPRODUCING DEVICE.

SPECIFICATION forming part of Letters Patent No. 655,480, dated August '7, 1900.

Application filed May 3, 1900. Serial No. 15,351. (No model.)-

To all whom it may concern.-

Be it known that I, THOMAS A. EDrsoN, a citizen of the United States, residing at Llewellyn Park, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Phonographic Reproducing Devices, (Case No. 1,034,) of which the following is a specification.

My present invention relates to improvements in reproducing devices for phonographs and allied talking-machines of the type heretofore invented byme and described and claimed in my application for patent filed September 21, 1899, Serial No. 731,138. The phonographic reproducers of the type in question are adapted for the more accurate tracking of the record than the usual spherical reproducers, and particularly for the tracking of records which are characterized, in part at least, by the formation of waves representing the fundamental tones and principal overtones and which may be of greater width than length, the particular form of such waves obviously preventing the accurate engagement therewith of the spherical reproducer.

My present invention consists in a reproducing device which is especially adapted for the reproduction from records made by a re* cording-tool having a curved cutting edge, and the present reproduceris therefore made of a form to properly engage the curve of the side walls of the record, while in its longitudinal dimension it presents a curve of less.

radius.

The object of my present invention is to provide a phonographic reproducer of this type which can be constructed very cheaply, which shall be effective in operation, and wherein in the preferred form fresh engaging surfaces can be presented for operation in case of wear. To this end my present reproducer comprises generally a disk or part of a disk having a rounded engaging edge which bears upon the record, with its transverse curve adapted for the accurate engagement with the side walls of the record and with its longitudinal curve sufficiently reduced as to allow for its proper engagement with substantially all the waves of the record representing at least the fundamental tones and the principal overtones.

Assuming mypresent reproducer to be used for reproducing from a record made with a recorder having a curved cutting edge, the

invention in its preferred form comprises aconnected with the reproducer-diaphragm,

whereby the position of the disk Within said slot may be shifted to present a fresh surface to the record when desired.

In order that my invention may be better, I

understood, attention is directed to the accompanying drawings, forming a part of thisspecification, and in which- I Figure 1 is an enlarged sectional view showing the preferred form of my invention applied to a reproducer-diaphragm through a. floating weight in the usual way; Fig. 2, a-

sectional view, on an enlarged scale, of the lever, the head, a'ndthe reproducing-disk; Fig. 3, a section on the line 33 of Fig. 2, and Fig. 4: a perspective view representing the parts of Fig. 2 separated from each other.

In all of the above views corresponding parts are represented by the same numerals of reference.

1 represents a reproducer-diaphragm carried in the usual frame 2, and 3 a pivoted floating weight carrying a fulcrum 4 for the reproducer-lever 5, the free end of which is connected to the diaphragm 1 bya link 6, all as is common in the art. Secured to the end of the lever 5 in any suitable way is a head 7, which may be slotted at its top for the reception of the end of said lever, as shown. The under surface of the head 7 is formed with a curved slot 8 therein, which may be made in a milling-machine, and mounted in said slot is a disk 9, which is the reproducing device proper. Instead of employing a complete disk the reproducing device may comprise any desired part of a disk. Preferably a complete disk is employed, which is secured in place within the slot Sin any suitable Way, as by means of shellac, the advantage of this construction being that the disk may be turned around to present a fresh engaging surface when worn. The employment of a complete disk also enables the device to be easily constructed by cutting sections from a cylinder. The material of which the disk 9 is formed may be any suitable refractory substance, preferably sapphire. The curve of the disk 9 transversely to the record is preferably somewhat less than the curve of the recording device, so that the disk will properly engage the side walls of the recordgroovethat is to say, if the recording device is .035 of an inch in diameter the diameter of the disk may conveniently vary between .025 and .030 of an inch. In other words, assuming the width of the record-groove to be of the standard-namely, .01 of an inch-the diameter of the reproducer-disk may vary from two and one-half to three times that dimension. The bottom edge of the disk is rounded, as shown, with a curve which presents longitudinally to the record a smaller radius than the transverse curve, whereby the reproducing device will engage and accurately track a wave which may be of less length than Width. This longitudinal curve may be made obviously less when very hard records are used than when the records are relatively soft; but in no case should it be made small enough as to result in undue wear of the record-surface. 7

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is as follows:

1. In phonographs and allied talking-machines, the combination with the diaphragm, of areproducer connected therewith and comprisinga disk-like body which presents transversely to the record a curve substantially coincident with that of the record-groove and longitudinally of the record a curve of less radius, substantially as set forth.

2. In a phonographic reproducer, the combination with the reproducer-diaphragm, of a reproducing device connected therewith, of

substantially the same thickness throughout,

shifting the position of said disk with respect,

to its center, substantially as set forth.

5. In a phonographic reproducer, the combination with a reproducer-diaphragm and a head connected to said diaphragm, of a disklike reproducing device carried by said head and presenting a rounded engaging surface, substantially as set forth.

6. In a phonographic reproducer, the cornbination with a reproducer-diaphragin and a head connected to said diaphragm, of a disklike reproducing device carried by said head and presenting a rounded engaging surface, and means for shifting the position of said reproducing device within said head, substantially as set forth.

'7. As a new article of manufacture, a re producing device made in the form of a disk having a rounded engaging surface and of a diameter approximately three times the width of the record groove,substantially as set forth.

8. As a new article of manufacture, a reproducing device made of sapphire in the form of a disk havinga rounded engaging surface, and of a diameter approximately three times the width of the record-groove, substantially as set forth.

This specification signed and witnessed this 30th day of April, 1900.

THOMAS A. EDISON.

W'itnesses:

J. F. RANDOLPH, FRANK L. DYER.

US1535100A 1900-05-03 1900-05-03 Phonographic reproducing device. Expired - Lifetime US655480A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US1535100A US655480A (en) 1900-05-03 1900-05-03 Phonographic reproducing device.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US1535100A US655480A (en) 1900-05-03 1900-05-03 Phonographic reproducing device.

Publications (1)

Publication Number Publication Date
US655480A true US655480A (en) 1900-08-07

Family

ID=2724049

Family Applications (1)

Application Number Title Priority Date Filing Date
US1535100A Expired - Lifetime US655480A (en) 1900-05-03 1900-05-03 Phonographic reproducing device.

Country Status (1)

Country Link
US (1) US655480A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060055724A1 (en) * 2004-09-10 2006-03-16 Krawczyk John W Fluid ejection device structures and methods therefor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060055724A1 (en) * 2004-09-10 2006-03-16 Krawczyk John W Fluid ejection device structures and methods therefor

Similar Documents

Publication Publication Date Title
US5455730A (en) Contact magnetic recording disk file with a magnetoresistive read sensor
US6937421B2 (en) Patterned media having offset tracks
US6967820B2 (en) Head suspension for disk drive
SU803872A3 (en) Device for mechanical recording of videosignal
KR100309587B1 (en) Information recording disk
FR2404885A1 (en) RECORDING AND REPRODUCTION DEVICE IMPLEMENTING A PERPENDICULAR MAGNETIC FIELD ACTING ON A THIN DOUBLE-LAYER MAGNETIC FILM
US3336583A (en) Deformable magnetizable disc mounted on cylinder
DE60027655D1 (en) Recording medium and reproduction method and apparatus for this recording medium
US4375656A (en) Magnetic head assembly with asymmetric slotted configuration
KR20030087177A (en) Suspension and head assembly
US4159494A (en) Flexible disk in reversible cartridge
US10026429B2 (en) Perpendicular magnetic recording medium
US7418723B2 (en) Optical pickup device and optical disk record/playback device for reducing the size of the record/playback device
US3824352A (en) Stacked piezoelectric transducer acting as quarter-wave resonator for recording video information
US4843505A (en) Magnetoresistive sensing element with a projection for enhanced data reading
JP2000187839A (en) Reproducing device for both surface recording medium
GB1266202A (en)
ES403351A1 (en) High recording density magnetic media with square b-h loop
KR940009973A (en) Magnetic disk device
US3872241A (en) Video disc pickup with capacitive tracking
US3079468A (en) Magnetic recording and reproducing
US1827051A (en) Recording and reproducing system and apparatus
US3384880A (en) Disc memory storage comprising magnetic heads arranged obliquely to the track
US8083442B2 (en) Cutting tool for lapping plate
US3035295A (en) Magnetic tape cleaner