US2265960A - Construction of sound record film - Google Patents

Construction of sound record film Download PDF

Info

Publication number
US2265960A
US2265960A US33170140A US2265960A US 2265960 A US2265960 A US 2265960A US 33170140 A US33170140 A US 33170140A US 2265960 A US2265960 A US 2265960A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
film
tracks
perforations
construction
width
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
Inventor
William L Woolf
Original Assignee
William L Woolf
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
Grant date

Links

Images

Classifications

    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ELECTROGRAPHY; HOLOGRAPHY
    • G03CPHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C3/00Packages of films for inserting into cameras, e.g. roll-films, film-packs; Wrapping materials for light-sensitive plates, films or papers, e.g. materials characterised by the use of special dyes, printing inks, adhesives
    • G03C3/02Photographic roll-films with paper strips

Description

DMn 9, 1941. w. L. WOOLF 2,265,960

CONSTRUCTION OF SOUND RECORD FILM Filed April 26, 1940 VBY I ATTORNEY Patented Dec. 9, 1941 UNITED STATES PATENT OFFICE CONSTRUCTION or soUNn aaoonn mM william L. woon, Bayside, N. Y. Application April ze, 1940, serial No. 331,701 2 Claims. (ol. 274-43) l This invention' relates to a nlm upon which sound may be recorded and from which sound may be reproduced. It relates particularly to a film which is perforated near its edges and in which the two ends are joined together so that the film is a continuous one.

The primary object of the invention is to provide a film of this character in which the number of tracks and the space between the perforations and edges of the film bear such relation to each other that a film of standard width will stand the greatest average amount of use.

In a standard nlm of 35 mm. in width, it is entirely practical to produce sound tracks with a stylus, which tracks may be so close together that 120 of them to the inch may be recorded side by side without danger of one sound track interfering with another. Such tracks in a celluloid iilm are more permanent than the lm itself. That is to say the total playings the track will stand without wearing out the track beds, is greater than the number of times the film will go through the machine without wearing out or breaking.

In a machine using a continuous film such as here contemplated, the entire film goes over the various feed rolls and sprocket each time one sound track is recorded or reproduced. As the number of tracks multiplies, the amount of wear on the film increases, hence the factor of wear becomes important in determining the width of film which will allow the greatest average amount of use.

If a wide film is used, a great many tracks are available, but the lm will wear out before all of the tracks are utilized. If, on the'other hand, the film is made quite narrow, there is a loss of economy in the utilizable space because whether a film is wide or narrow, there must necessarily be two outer marginal edges, two rows of perforations and two margins within the perforations whether a few tracks are used or many.

In the standard film such as employed in the moving picture industry, the point of greatest weakness lies between the outer edges of the film and the corners of the perforations. The first breaks to occur when a illm of this character is put to a break-down test, extend across the narrow strip between the perforations and the outer edge.

A feature of the present invention relates to a. film construction wherein that portion of the iilm between the outer edges of the perforations and the edges of the film is made wider than the same portions in a standard nlm of standard width.

In the drawing, Figure 1, is a small portion of a standard 35mm. film; and

Figure 2 is a similar view of a film constructed in accordance with the present invention.

In a standard 35 mm. motion picture film, the distance between the edge of the perforations and the edge of the film is .0795.

In the lln of the present invention, shown in Figure 2, this width is increased to .114"; the difference being .035 or 44%. By reenforcing the edge of the film by the above amount and with standard perforations, such a nlm can with safety be relied upon to run through the recording machine 3500 times.

The number of sound tracks which it is most advantageous to record on a given piece of iilm will of course depend upon the average number of times which each sound track is played and this of course will depend upon the nature of the recordings, the taste of the user and the natuze of the use of the recordings, whether for pleasure, information or education, it being apparent that it is futile to put more tracks on the lm than can be successfully utilized before the film breaks down.

The average of a number of studies of this subject indicates that the number of desired playings per track is 36.08. Therefore, if the total number of playings which the iilm will stand is equal to 3500 and the average number of times each trackn is played is 36.08 then the number of tracks that a 35 mm. film may conveniently accommodate is equal to 97.`

Therefore by increasing the width of that portion of the film between the outer edge of its perforations and the edges of the film by 44% as stated above, the film will wear as long as the average number of playings of its 97 sound tracks, is subjected, and without unnecessary waste of available playing space. The standard perforations are .110" wide. Since there are two sets of perforations, one on each edge of the lm, the total space occupied by the perforations is .220. As clearly indicated in Figure 2, the width between the perforations and the edge of the film is .114", thus leaving a space available for recordations equal to .929. Of this space 97 tracks at 120 tracks to the inch occupy 96 1A20+-004 inch=.804 inch; .004" being the width of a single track. Allowing a margin of .0625" on either side of the recorded area, the total width of .929" is utilized.

It will thus be seen that the standard 35 mm.

2 aacaeeo film is capable of operating at maximum usefulness by increasing the width of each of its outer margins by .035, thus diminishing the distance between perforations by twice this amount and leaving room for 97 tracks at 120 tracks per inch. The figure 97 also lends itself to convenient counting of the tracks since the largest number that can be indicated on a two-place counter is 99.

In the foregoing specication reference has been made to a standard iim. By such iilm is meant a lm of 35 mm. in width with the size and spacing of the perforations as indicated in i0 width (35 mm.), the distance` between the inner edges of its perforations being of the order of .929.

WHLIAM L. WOOLF.

US2265960A 1940-04-26 1940-04-26 Construction of sound record film Expired - Lifetime US2265960A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US2265960A US2265960A (en) 1940-04-26 1940-04-26 Construction of sound record film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US2265960A US2265960A (en) 1940-04-26 1940-04-26 Construction of sound record film

Publications (1)

Publication Number Publication Date
US2265960A true US2265960A (en) 1941-12-09

Family

ID=23295004

Family Applications (1)

Application Number Title Priority Date Filing Date
US2265960A Expired - Lifetime US2265960A (en) 1940-04-26 1940-04-26 Construction of sound record film

Country Status (1)

Country Link
US (1) US2265960A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115806A (en) * 1959-07-20 1963-12-31 Cordova Inc Method of condensed motion picture films for projection
US3281151A (en) * 1963-05-09 1966-10-25 Kalart Co Inc Method of and device for recording and reproducing photographic sound patterns
US5338650A (en) * 1992-02-21 1994-08-16 Konica Corporation Silver halide color photographic light-sensitive material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3115806A (en) * 1959-07-20 1963-12-31 Cordova Inc Method of condensed motion picture films for projection
US3281151A (en) * 1963-05-09 1966-10-25 Kalart Co Inc Method of and device for recording and reproducing photographic sound patterns
US5338650A (en) * 1992-02-21 1994-08-16 Konica Corporation Silver halide color photographic light-sensitive material

Similar Documents

Publication Publication Date Title
Crimp Pictures
US2548011A (en) Sonic teacher
US3328195A (en) Magnetic recording medium with two storage layers for recording different signals
US3737582A (en) Flat magnetic heads
US4387807A (en) Ring cover protector for records
US1940088A (en) Sound picture record container
US3558142A (en) Recording tape magazine
US2775050A (en) File card structure
US3620476A (en) Cassette duplicator
US3197751A (en) Flying magnetic head assembly
US2950971A (en) Multiple sound tracks
US3418434A (en) Pneumatic means for maintaining tape in contact with transducer
US2272821A (en) Telegraphone
JPS5224027A (en) Record regenerator
US3075717A (en) Apparatus for making records and/or reproducing records from strip material and magazines for such strip material
US4123791A (en) Magnetic transducer device with outrigger bars
US3297398A (en) Film strip holder
GB2187442A (en) Storage box
US2973410A (en) Pressing plate of a magnetic sound record reading machine
US2029979A (en) Phonographic film
US3801042A (en) Latch for tape cassette reels
US3060279A (en) Magnetic transducing heads
US3009707A (en) Combination phonograph record and package
JPS52130228A (en) Video disk reproducer
US1999754A (en) Recording and projecting sound on film apparatus