FR2533715A1 - NON-SHUTTERING CINEMATOGRAPHIC CONTROL PROJECTOR - Google Patents

Abstract

THE INVENTION RELATES TO A CINEMATOGRAPHIC FILM CONTROL PROJECTOR. THE APPARATUS INCLUDES, ALIGNED IN A BOX 34, A STROBOSCOPE 66, A CONDENSER 38, A PROJECTION WINDOW 54 WITHOUT SHUTTER AND A PROJECTION LENS 40. THE STROBOSCOPE IS CONTROLLED IN SYNCHRONISM WITH THE SCROLLING OF THE IMAGES OF THE FILM 12 BY A MECHANISM 12. RELEASE 42 WHICH INCLUDES A PHOTO-ELECTRIC CELL 18 WHICH DETECTS MARKS SPACES 80 CARRIED BY A WHEEL 76 WITH SNAPS DRIVEN BY THE FILM WHICH IS DRIVEN BY A RECEIVER COIL LOCATED OUTSIDE THE PROJECTOR 10.

Description

The present invention relates to a headlamp of ci-

  nema that uses a flashlight or strobe of strong in-

  tensity with controlled flash times, which removes the

  need to use an image shutter mechanism.

  In the field of control projectors, it is necessary to inspect the cinematographic film at the end of its development and processing to determine whether it

  has physical defects, abnormal color,

  sound track faults, damage to perforations

training, etc

  In the past, ways have been developed to

  put to carry out such an inspection However, the provisions

  Prior art devices, such as those described in US Pat. Nos. 4,113,367 and No. 4,126,386, are located in independent control rooms, usually remote from processing and processing facilities.

  in addition, the mechanisms of the two above patents are systems

  image stabilization systems using analyzers

  multi-faceted reflective roof polygons that ne-

  stop excessive and meticulous maintenance to ensure minimal damage to the film In addition, such devices

  collect dust and wax from the new film-

mentally developed.

  In 1940, US Patent No. 2,168,013 was issued which related to a film machine, more commonly

  called a projector, in which the shutter was removed

  mé This projector drove the reel to pull the film through the projector in front of the lens but it also had the disadvantage of using the drive means

  to also rotate a movable contact member the-

  which, in turn, operated a gas rectifier device.

  This particular structure had many other disadvantages, not the least of which was the necessity which

  there was also excessive maintenance to be able to

  r some form of correlation between the immobility

  tantane of the film image and the lighting In addition, this device could not have been used as a control projector to make appear a stationary single image

  of the film for control purposes In addition, another drawback

  deny of US Patent No. 2,168,103 lies in the fact that an image is illuminated for less than fifty percent of the total time during which it is exposed Finally, this

  structure of the prior art uses wheels to er-

  gots on the drive mechanism, which increases the risk of damage to the film as it passes

on them.

  Another patent of interest is the patent

  US No. 2,995,064 which relates to a projector without shutter-

  In this case also, the principle is similar to this-

  him of US Patent No. 2,168,013, this projector having the

  apparent inability to illuminate the image for an increased period of time but still using a drive coil

  direct by lugs and light switching means.

  This patent has the disadvantage of using physically actuated switching means. This would require a

excessive maintenance.

  The present invention relates to a projector without ob-

  improved impeller particularly suitable for control

  of a cinematographic film as it leaves the wardrobe

  development and processing device chage This allows you to view the film before rolling it up and take quick corrective action if any problem arises

  draw or processing occurred.

  Another advantage is that the projector uses a

  flash or strobe light which can be programmed

  duration depending on the speed of the film during

  that he marches past the projector lens The present pro-

  jector is capable of projecting a film at a degree of vi-

  fast while continuing to give bright images

sharp and crisp.

  Another advantage of the invention is that it does not use

  no shutter and no spring tension is exerted

  created on the projection window, all these characteristics

  helping to prevent film damage.

  In addition, the projector of the present invention has

  the advantage of not causing an eclipse or inter-movement

  mittent film in the frame-by-frame projection effect of

movie on the screen.

  Another object and advantage of the invention is that the mechanism

  film drive system is constituted by a take-up reel and by drive means which are not

contained in the projector.

  Yet another advantage of the invention is that

  that it provides for the use of a device mounted on the projection

  tor to adjust the strobe lightning frequency entirely dependent on the speed of the film

moves through the projector.

  Yet another advantage of the present invention is the use of rollers to guide the film through the projection window of the projector, which eliminates wear and the risks of tearing of the perforations formed on the edges.

marginal of the film.

  We will better understand these advantages of the invention as well as the organization and mode of operation of the projector as well as other objects and advantages of the invention, in

  referring to the description which will follow considered in the lu-

  mière of the accompanying drawings in which: Fig 1 is an overview showing a location in which the projector which is the subject of the present

  invention can be mounted and how it can be used

  read; Fig 2 is a side elevational view of the projector without shutter of the present invention in which a film has been placed; Fig 3 is a front elevation view of the film and part of the projection window, taken along line 3-3 of Fig 2; Fig 4 is a partly sectional view taken along line 4-4 of Fig 3; and Fig 5 is a front view, in elevation and partly

  in section, along line 5-5 of Fig 2.

  In Fig 1, there is shown a film projector without shutter, designated by the reference

  general 10, particularly suitable for vi-

  top of a motion picture film 12 after it has been developed, processed and dried In the preferred embodiment, the projector 10, usually called a control projector 10, is mounted on the end of a drying cabinet or dryer 14 The cabinet 14 may include a series of floating rollers 16 around which the film 12 is passed

  at its exit from the processing part (not shown).

  Processing equipment, drying cabinet 14 in-

  cluse, is said to be endless because it is possible to join or glue in an end-to-end arrangement the films of a number of reels of undeveloped film, and introduce the film strip into the equipment so be processed and sort

  then from the drying cabinet 14 The rollers 16 are assembled

  floating tees so that any differences in vi-

  film size during development and securing stages

  chage can be made up to compensate for the differences

travel speed rences.

  On the end 18 of the cabinet 14 is fixed-a table or support 20 which has at least one side 22 on which is mounted at least one mechanism 24 for film winding drive In addition, it is preferable that a second mechanism

  24 A film winding drive is used

  lesson that the movement of the film out of the drying cabinet is not significantly slowed down for a period of time

  higher than that allowed by floating rollers.

  The film winding mechanisms, 24 and 24 A, carry one or more reels 26 and are coupled to one or more motors (not shown) mounted inside the table 20 behind

side 22.

  Film 12 is a classic cinematographic film by

  one of the usual types called 35 mm, 35/32, 16 mm or 8 mm.

  As can best be seen in Figs 3 and 5, the film 12

  has perforations 28 on its two marginal edges 30.

  Between the perforations 28 formed on each edge 30, are arranged successive images 32 In general,

2-533715

  in the case of a 35 mm film (enlarged for the purpose of the illus-

  tration), there are four perforations on each side of each

picture 32.

  The projector 10 is mounted on the table 20 In general, the projector 10 comprises a box or case 34, a lantern 36, a condenser 38, a projection objective, trigger means 42 and rollers 44 and 46

  all of which are fitted in the case.

  The box or box 34 has several feet 48 which can be adjustable to allow centering and

  leveling of the film 12 projected by the projection lens

tion 40 on a screen 50.

  The condenser 38 and the projection objective 40 are of a conventional type The projection objective 40 comprises means 52 provided with a thread which can move the objective

  to focus the projected image on the control screen.

  Between the condenser 38 and the projection objective 40 is disposed a projection window 54 without objective The projection window 54 comprises a pair of plates 56 and 58 (more particularly shown in FIG. 4) which

  are juxtaposed leaving enough space between them

  space for film passage 12 Each end of each plate 56 is curved outward to ensure that there will be no blockage or jamming of the film at its

  entering window 54 or leaving window 54.

  In addition, each plate 56 and 58 is provided with a respective image opening 60 (FIG. 3), the two openings being

  arranged face to face, their height corresponding to the height

  image frame 32 of the film and their width corresponding to

  the total width of the film 12 up to the outer marginal edges

laughs about it.

  In this way, when an image 32 is positioned

  between the openings 60, the image projected on the screen represents

  feel the subject of the image so that you can examine the color to determine if it is normal or abnormal In addition, you can visually inspect the entire image and the margins to detect possible deterioration

  produced during development In addition, we can control

  ler the sound track to detect its imperfections Finally, we can physically inspect each perforation 28 whose image is projected on a large scale to determine if it is damaged. A roller 44 is mounted on the housing below the projection window 54 This roller does not have lugs

  drive but only a smooth surface for

  put the film to move over it The roller 46 mounted at the top of the case 34 has a similar structure The film 12 when it leaves the opening 64 of the drying cabinet 14, passes around the smooth roller 46 Like the two rolls

  44 and 46 are smooth, we can see that the friction resistance

  possibly exerted on the film 12 is light.

  The lantern 36 will now be described. A classic stroboscope or flashlight 66 has been shown in the drawings 66 provided with a reflector 68 mounted behind it.

  of the order of a few microseconds under the action of conden-

  sators and other conventional devices, not shown The strobe 66 and the reflector 68 are both aligned

  with the condenser, the objective and the projection window.

  Also shown for the purposes of illustration is a current source 70 which can excite the strobe 66 and provide the energy necessary to start it and by means of

  which the initiation or production of lightning can be com-

  mandated by the action of the triggering means 42.

  It has been found that with periodic priming at a frequency

  high quence of a strobe or flashlight of strong in-

  density, there is no need to use a pro-

  classic jection equipped with a shutter If we enslave

  the strobe 66 flashes at flash speed

  lement of the film in the window 54, the image is projected with a frame-by-frame scrolling effect without jitter or eclipses and, however, continuously like a film

  cinematographic for the operator or technician.

  To this end, the trigger means 42 transmit, via a line 74, a pulse to the source

  current 70 and activate the lamp and control the lighting

  and also its duration in microseconds.

  The triggering means 42 comprise a lug wheel for conventional film 76, a photoelectric cell 78

  and legible marks 80 carried by the wheel 76.

  In service, the gear 76 is mounted on a shaft 82

  which is rotatably mounted in a ring 84 roller support

  which is, in turn, mounted on the boot 34 by conventional means The wheel 76 with lugs is retained on the shaft 82 by means of a nut and can rotate freely with

tree 82.

  The lug wheel 76 has a series of claws or er-

  gots 88 distributed circumferentially around the base an-

  ring 90 of the wheel 76 There are lugs on the two annular edges of the base 90 at locations adjacent to the decreasing section annular edges 92 and 94 extending towards the outside of the wheel 76 The wheel 76 has at least a flat side face 96 on which the readable marks 80

are placed.

  As can be seen in FIG. 5, the film 12 is placed on the wheel 76 so that at least part of the film which passes around the wheel has its perforations 28 engaged on the claws or lugs 88 Thus , when the film is wound on one of the reels 26, the wheel 76 with lugs

  turns Given the fact that -wheel 76 is rotatably mounted

  tion free, there is no blockage or jamming of the film on the pins 88 so that the damage to the film is reduced

at least.

  In order to cause the flashlight or strobe 66 to ignite or produce flashes at the correct times, the readable marks 80 are preferably constituted by

  reflective marking lines 80, one of which is available

  all four pins In other words, for a film.

  35 mm, four teeth 88 represent the height of a single

  film image The silver lines 80 are placed on the.

  flat face 96 around the periphery of the wheel In the case of a 16 mm film, the positioning would be different, being

  since there are usually only two pins per image.

  Now to read, the inventor uses

  reads a photoelectric cell 78 mounted in a casing 98.

  The casing 98 is, in turn, mounted on the lantern 36 so that the cell 78 is aligned with the flat face 96 of the wheel 76 and the path of the silver reflecting lines

spinning.

  So when cell 78 is made active, a

  light beam 100 is directed outwards as shown

  felt by the arrows in Fig 5 If the beam 100 'does not meet a reflective substance, no trigger signal is transmitted by the line 74 However, the wheel 76 continuing to turn, the beam 100 hits the

  80 silver lines and is reflected along the marked path

  felt by the arrows 102 This reference or reflection of the

  this can, in turn, be transmitted by line 74 to the

  current indication 70 and the flash lamp 66 is then actuated Consequently, when the lug wheel 76 rotates because the take-up reel 26 draws the film 12

  attached to the lugs 88, the readable marks 80 pass from-

  before the light beam 100 of the photocell-

  78, which causes the power to be connected and cut off for a few microseconds depending on the number of meters of film which pass per minute in the projection window 54. In some cases where the speed of the film is as high as 91.4 meters per minute, the flashes of the flashlight or strobe 66 should be as high as about 4,800 flashes per minute on the basis of a 16 mm film comprising 105 images per meter If on the other hand, the speed of the film is slowed down to 30.6 m / min the flashes of the flashlight

  will be emitted at a frequency of approximately 1920 flashes per minute.

  It will be understood that when a conventional flash lamp or strobe 66 of high intensity is used, the projection of the image is extremely clear, allowing a quality inspection of the film as it leaves the drying cabinet. In addition, the extremely high succession of pulses which follow each other at such short intervals are observed to the eye as a continuous interrupted sequence when the images

  32 are flashed on the screen 50.

  Although the preferred position of the control projector is that in which it is adjacent to the film drying cabinet 14 to facilitate its use, it is also possible to

  position it in a location away from the cabinet

  chage 14 In such a case, the developed film is wound on

  the coil 26 and the coil is then transported to the em-

  placement where projector 10 has been installed.

  Although the above described embodiment has been

  chosen because it is the best mode of realization

  tion currently contemplated by the inventor, it is well-

  Whereas this example should not be interpreted as limiting the fact that specialists in this field, having read the teachings of the present invention,

  will be able to make changes to this mode

  Specific reading Consequently, the scope of the pre-

  sente invention must be determined only by the claims-

annexed.

Claims (8)

  1 A control projector (10) without shutter for film   cinematographic (12), this projector being capable of effecting   killing a rapid continuous projection of whole film images (32) from one edge to the other on a screen (50) to allow their visual inspection in order to ensure the maintenance of a correct quality of the whole of the film frame after   that it has been developed and processed, this projector being   laughed at in that it includes a projector housing (34),   optical means mounted on the shoemaker and comprising a con   density (38) and a projection lens (40) for projecting said film images; a projection window (54) without shutter interposed between the condenser and the projection objective, this window comprising an opening (60) for projecting a film image so that the film which is to be   controlled passes in front of the opening and is projected; a strobos-   cope (66) carried by the housing behind the condenser and in alignment with the condenser and the projection lens and designed to be excited and de-excited in periods of a few microseconds; trigger means (42) carried by the housing for controlling the strobe start frequency when each frame of the film passes   the aperture so that each image is illuminated   rée and projected on the screen to allow the examination of the film in order to ensure the maintenance of a correct quality while preserving the movement created by the sequential observation of a series of images; a current source (70) forming part of the strobe, this source being controlled by the triggering means; film winding means (24, 24 A) separate from the projector and arranged to draw the film (12) through the projection window and wind it on   a film storage reel (26).   2 A spotlight without shutter according to the resale   dication 1, characterized in that the headlight (10) is   designed to be positioned adjacent to the rear   drying moire (14) of a processing and processing machine of continuous films.   3 A spotlight without shutter-according to the resale   dication 1, characterized in that the projection window (54) comprises smooth plates (56, 58) spaced from one another and each having an opening (60) aligned with the opening of the other, and in that the film (12) passes between   said plates and that this projection window is demu- denies shutter.   4 A spotlight without shutter according to the resale   dication 3, characterized in that the openings (60) have   a width such that they extend to the margins   of each of the images (32) of the film (12).   A control projector without shutter according to claim 1, characterized in that the triggering means (42) are controlled by the relative movement of the film (12) through the projector (10).   6 A spotlight without shutter according to the resale   dication 1, characterized in that the triggering means (42) comprise a wheel (76) with lugs for film mounted on the case (34) and vertically aligned with the window   projection (54) and in that the film is put in place and   spun so as to pass around the lug wheel so   that a certain number of perforations (28) of the film are engaged   on the lugs (88) of the wheel which causes the rotation   tion of the lug wheel in a manner proportional to the   speed of movement of the film through the projector.   7 A spotlight without shutter according to the resale   dication 1, characterized in that the lug wheel (76) carries   all around it spaced readable marks (80).   8 A spotlight without shutter according to the resale   dication 7, characterized in that a photoelectric cell (78) is positioned adjacent to the spaced readable marks (80) of the lug wheel and this photoelectric cell is excited when its beam is interrupted by the readable marks spaced at during the rotation of the wheel so that the photocell operates the strobe and   synchronizes the frequency of the flashes it emits.   9 A spotlight without shutter according to the resale   dication 8, characterized in that the readable marks consist of a number of spaced reflective marks (80) distributed around the circumference of the wheel at a predetermined spacing equal to the number of pins (80) per image of the film.