Laser recording system

A recording system uses a laser beam for imaging the surface of a photographic film which is held in a curved arrangement to allow light to be focused in precise position in a circular light path on the film. The film is maintained in the curved arrangement by resilient means associated with a film holding curved platen.

BACKGROUND OF THE INVENTION 
In the field of recording or imaging systems, the laser or optical maser 
has been used to provide high speed and high intensity operation. The 
laser amplifies light and radiates the amplified light in the form of a 
coherent, extremely high intensity light beam. The light beam may be 
modulated or controlled in a manner wherein an image is recorded on a film 
or like record media in a scanned light pattern of a succession of lines. 
It is generally desired to improve the laser scanning or imaging technique 
in these systems. 
Representative documentation in the field of recording or imaging systems 
includes U.S. Pat. No. 3,154,371, issued to W. R. Johnson on Oct. 27, 
1964, which discloses an optical recording system utilizing a laser light 
source, a rotating reflector, a curved platen to correct for geometric 
distortions of the scanning beam and vacuum pressure exerted at the 
surface of the platen to hold the film strip secure in a desired plane. 
U.S. Pat. No. 3,809,806, issued to R. Walker et al. on May 7, 1974, 
discloses film recording apparatus having a laser, a beam expander, a 
lens, a rotating reflector and a curved bridge member for supporting the 
film. 
U.S. Pat. No. 3,874,621, issued to L. R. Blair et al. on Apr. 1, 1975, 
discloses a recording system using a gas laser along with a curved air 
film platen with small air jets providing an air bearing. 
U.S. Pat. No. 3,938,191, issued to H. I. Jarmy on Feb. 10, 1976, discloses 
a read head carriage which is supported on air bearings and is driven by a 
precision lead screw. 
U.S. Pat. No. 3,953,859, issued to J. W. Locke on Apr. 27, 1976, discloses 
apparatus for recording images on film by using a laser beam, a film 
transport clamped to a carriage and having an arcuate-surface platen with 
a vacuum box to provide suction for holding the film. 
U.S. Pat. No. 4,168,506, issued to S. I. Corsover on Sept. 18, 1979, 
discloses a curved film guide to position the film during both recording 
as well as reading mode and having curved, porous surfaces through which 
air is passed to support the film. 
U.S. Pat. No. 4,271,415, issued to M. Murakoshi et al. on June 2, 1981, 
discloses a laser COM device having a platen which is adapted to clamp the 
film between first and second pairs of rollers. 
U.S. Pat. No. 4,293,864, issued to R. D. Scott on Oct. 6, 1981, discloses a 
laser scanner transport having a translation motor to move a modulated 
laser beam back and forth inside a transparent cylinder, and a spinner 
motor to cause rotation of the beam to describe a helical pattern on the 
cylinder and the printing medium thereon. 
And, U.S. Pat. No. 4,358,774, issued to R. L. Wilkinson on Nov. 9, 1982, 
discloses a recording system which utilizes a write laser and a read laser 
and control means for maintaining proper focus of the laser beam. 
SUMMARY OF THE INVENTION 
The present invention relates to recording systems. More particularly, the 
present invention relates to a recording system utilizing a laser beam 
which is caused to be directed at a scanning spot in a defined circle of 
light or circular light path and wherein microimages are generated in 
successive line or raster manner to create a pattern on a film or like 
record media. The laser beam is modulated or controlled in response to 
electronic input signals, and beam focusing lenses direct the light at a 
precise location or spot on a scanning mirror which is rotated in a 
circular path by means of a variable speed driver. The laser beam is then 
directed by the rotating mirror at 90 degrees, or normal to the initial 
axial direction of the beam, through the beam focusing lenses and onto the 
film. The film is supported on a curved platen and is spring loaded or 
held in a precise and firm position thereon, and the platen is caused to 
be moved axially relative to the circular light path for recording 
successive lines of data on the film. 
In view of the above discussion, the principal object of the present 
invention is to provide an improved recording system which utilizes a 
laser light source caused to be directed to a circular spot for recording 
an image on record media in successive line manner. 
Another object of the present invention is to provide a recording system 
utilizing a laser beam scanner for imaging a pattern on film or like 
record media. 
An additional object of the present invention is to provide precise means 
for holding record media and for moving the media along a path for 
recording data in successive line manner. 
A further object of the present invention is to provide a laser record or 
read system to image a pattern on dry silver film which is precisely held 
in curved or arcuate manner for receiving a beam of light focused in the 
form of a circular path. 
Additional advantages and features of the present invention will become 
apparent and fully understood from a reading of the following description 
taken together with the annexed drawing.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
FIG. 1 illustrates a diagram of components of a typical or universal type 
research tool for laser recording of microimages in a recording system and 
includes a laser 12 directing a beam of light 14 to an acousto-optic laser 
light modulator 16. The light beam is projected through a beam expanding 
telescope 18 and then onto a ten-faceted hologon scanner disk 20 driven by 
an electric motor 22 through a shaft 24 for providing X-deflection of the 
light beam. The light beam is then directed to a galvanometer mirror 26 
for providing Y-deflection and the beam is further directed through an 
f-.theta. lens 28 for flat field and linear speed scanning of the focused 
spot and image display. The light beam is spot focused onto a film 30 
supported on a film holder 32. An X-Y camera 34 may be an option 
associated with the film holder 32, and a manual type film processor 36 
may also be positioned adjacent the film holder 32 for processing the film 
30, all of the above described equipment being operably associated with or 
supported on an optical breadboard table 38 or like supporting structure. 
A block or board 40 of electronic control elements is connected or coupled 
by lines 42, 44 and 46 to the modulator 16, the mirror 26 and the motor 
22, respectively. 
FIG. 2 illustrates an imaging or recording system supported on an optical 
breadboard mounting base 50 and including a 1.5 mW laser 52 of the 
helium-neon type suitably positioned and directing a beam of light 53 to 
an acousto-optic laser light modulator 54 supported from a mounting base 
56. The light beam 53 is directed along an initial path and passes through 
a bi-concave beam expanding lens 58 and then through two plano-convex beam 
focusing lenses 60 and to a monofacet scanning mirror assembly 62. The 
mirror assembly 62 is provided with a scanner balance weight 64 and the 
scanning mirror assembly is mounted on a hysteresis-synchronous motor 66 
of variable speed range from 1800-7200 revolutions per minute, the motor 
being enclosed by a motor housing 68. 
An optical mount focusing tube 70 has lens retainers 72 and 74 on 
respective sides of the lens 58 and the lens 60 and the tube includes a 
focusing male threaded portion. An outer optical tube 76 with a focusing 
female threaded portion includes angled slots for the laser cone of light 
78 to be directed to a medium for recording the image, or the cone of 
light may be directed to an upper position for reading the image. The 
optical tube 76 carries the light beam 53 in axial manner and is supported 
from an optics assembly outrigger support bracket 80 seated on the 
mounting base 50. 
The laser cone of light 78 is directed by the scanner mirror 62 to a 
focused spot 82 of light on a curved platen 84, as seen in FIGS. 2 and 3, 
and which platen is designed in the form as an arc of a circle and holding 
a film 86 or like record media. The curved platen 84 includes a film edge 
stop plate 88 and a spring 90 for precisely holding the film 86 on the 
curve of the platen and against the stop plate. 
The structure includes a pair of linear guide rods 92 and 94 positioned 
generally under the optical tube assembly 76 on a guide rod support block 
96 (FIG. 2) and extending into and fastened in the motor housing 68. The 
platen 84 is carried by means of linear low-friction bushings 98 and 100 
which ride on the guide rods 92 and 94, and the curved platen 84 is 
axially movable by means of a linear, variable-speed, drive motor 102. The 
drive motor 102 is directly connected to a lead screw 104 and secured with 
a lead nut 106. A bearing 108 (FIG. 3) is associated with the platen 84 
and rides on the right-hand linear guide rod 92. 
FIG. 4 shows a portion of a card 110 having an aperture 112 therein and 
wherein the aperture contains the film 86 on which is shown an image in 
the form of a plurality of lines 114 in a multi-raster scan arrangement. 
The X-direction indicates the scan line length as produced by the rotating 
scanner or disk 62, and the Y-direction is shown as a deflection produced 
by motion of the film 86 along the axial path of the curved platen 84. 
It is thus seen that herein shown and described is a system for recording 
data or information on record media by use of a laser light source and 
directing the beam of laser light onto film held on a curved platen for 
effecting a circular light path for imaging a pattern on the film. A film 
stop member is secured at one side of the curved platen and a spring at 
the other side of the platen maintains the film in precise position in 
curved manner and against the stop member. The apparatus of the present 
invention enables the accomplishment of the objects and advantages 
mentioned above, and while a preferred embodiment of the invention has 
been disclosed herein, variations thereof may occur to those skilled in 
the art. It is contemplated that all such variations not departing from 
the spirit and scope of the invention hereof are to be construed in 
accordance with the following claims.