JPS5961828A - Movie film inspection projector without shutter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motion picture projector that uses high intensity strobe light with a controlled flash duration to eliminate the need for a frame shutter system.

In the field of inspection projectors, motion picture film must be inspected at the end of its development and processing for physical scratches and blemishes, abnormal colors, soundtrack defects, damaged sprocket holes, etc.

Conventionally, devices have been developed to perform such inspections.

However, U.S. Pat. Nos. 4,113,367 and 4.1
Prior equipment, such as that shown in No. 26,386, was located in an off-line laboratory and typically remote from the film developer and processor. Furthermore, the devices of the above two patents:
The image stabilization system uses a multi-reflective roof polygon scanning device that requires extra careful maintenance to prevent film damage. Additionally, these devices collect dust and wax from newly developed film.

In 1940, U.S. Patent No. 2 was issued for a motion picture device that did not require a shutter, commonly known as a projector.
, No. 168.013 has been published. This projector drives a reel that is pulled through the projector and past the lens, but has the disadvantage of using a drive that also rotates the movable contact member that drives the gaseous rectifier. This particular construction has a number of other drawbacks, among them the instantaneous immobility of the film frames and the need for extra maintenance to achieve some form of correlation between illumination. Furthermore, this device could not be used as an inspection projector that holds one top still for inspection. Additionally, another drawback of U.S. Pat. No. 2,168.103 is that the top is illuminated less than 50% of the total time it is exposed.

Finally, this prior art device uses sprocket wheels for the drive, which increases the risk of damaging the film as it passes through it.

Another related patent is U.S. Pat. No. 2,995,064 for a shutterless projector. The principle of this patent is similar to that of US Pat. No. 2,168.013, which uses a tin rocket reel and light switch production directly, although the spinning top can provide long-term illumination.

This patent has the disadvantage of using a physically actuated switch device that may malfunction. This requires extra maintenance.

The present invention provides an improved shutterless projector particularly suited for inspecting motion picture film as it exits the drying cabinet of a developing and processing unit. This allows the film to be inspected prior to winding and quick corrective action can be taken if any printing or processing problems occur.

Another advantage is that the projector uses a strobe light whose illumination and duration can be programmed depending on the speed at which the film passes through the projector lens. This projector can feed film at high speed and still produce sharp and bright images.

Another advantage of the invention is that there is no shutter to damage the film and no spring tension on the film gate.

A further advantage of the projector of the present invention is that there is no dozer that stops the image on the screen, i.e. it does not interrupt the motion of the film.

Another object and advantage of the invention is that the film is driven by a take-up reel and a drive other than within the projector.

Yet another advantage of the invention is that the projector is provided with a device that adjusts the flash speed of the strobe depending solely on the speed of film movement through the projector.

Yet another advantage of the present invention is the use of rollers that do not cause wear and tear on the sprocket holes in the film ears to guide the film through the film gate of the projector.

These and other advantages will become clear from the description that follows with the help of figures.

FIG. 1 shows a shutterless motion picture film projector 10 particularly suited for visual inspection of motion picture film 12 after it has been developed, processed, and dried. In the preferred embodiment, the projection @ 10, also known as an inspection projector, includes a plurality of idler rollers 16 which are suspended in a conventional film drying tank 14.

The processing equipment, including the drying tank 14, is known to be endless as several reels of undeveloped film are divided horizontally and passed through for processing, and the drying tank 14 also exits.

Because the rollers 16 "float," differences in travel speed due to differences in film speed during development and drying are absorbed and compensated for.

A table 20sfx having at least one side wall 22 with at least one film winding drive 24 attached to the end 18 of the drying tank 14.

That is, attaching the support. Furthermore, the drying tank 14
A second film take-up drive 24A is provided in the table 20 behind the side wall 22 and has a mounting rod 26 to prevent film movement from stagnation for a longer period of time than the idler rollers 16 can compensate for. The ilm 12 is connected to a motor (not shown) and has sprocket holes 28 at both ears 3o. There are successive screen frames 32 between the sprocket holes of each ear 3o. Regarding the 35 Dragon film in general (
(Enlarged for illustration) Each side 34 of each top 32, lamp house 36, condenser lens 38, projection lens 4o
, tonga device 42, and rollers 44,46, all of which are mounted within the cabinet.

The housing or cabinet 34 has adjustable feet 48.

The condenser lens 38 and the projection lens 4o are of normal nature. The projection lens 4o includes a screw fitting #52, which moves the projection lens 4o to focus the projected image onto the viewing screen 5o.

It includes a pair of side-by-side plates 56, 58 (best shown in FIG. 4) spaced apart between the condenser lens 38 and the projection lens 4o. Each play is like that. Additionally, each plate 56,58 is provided with a top window 60 (FIG. 3) having a width equal to the height of the top 32 and a width equal to the total width of the film to the outer edge of the ear.

When the top 32 is placed between the windows 600 in this manner, the projected image on the screen will show the object inside the top and tell whether the color is normal or abnormal. In addition, all frames and ears are inspected to detect scratches and dirt that occurred during development. Additionally, the soundtrack 62 can be tested for defects. After the fact, each sprocket hole 28 can be inspected under magnification to determine if there is any damage.

The row 24 is placed under the film gate 54 in the cabinet 34.
Attach 4. This roller 44 has the same structure as the row 246 attached to the top of the sprue 34. Both rollers 44.4
6 is smooth so that the multi-shell ilm 12 is not pulled by these rollers due to friction.

Inside the lamp house 36 is a conventional strobe lamp 66 and a reflector 68 behind it. The strobe is excited and emitted in microseconds by a conventional capacitor and other devices (not shown).

Both strobe lamp 66 and reflector 68 are in line with the lens and film gate. Also shown for illustrative purposes is a power source 70 that excites strobe lamp 66 and provides luminous energy thereto. The trigger device 4 causes the strobe lamp 66 to emit light.
2.

Due to the high-speed periodic firing of high-intensity strobe lamps, conventional film gates with shutters are required so that the projected image continues to function as a motion picture film, with a stop-motion effect without the need for flutter or dozer.

For this purpose, trigger device 42 sends pulses via line 14 to power supply 70 to drive strobe lamp 66 to control the light emission and also the time in microseconds.

The trigger device 42 is a conventional film sprocket wheel 76;
photocell 78 and readable device 8 on sprocket wheel 76
Contains 0.

In operation, sprocket wheel 76 is mounted by any conventional means to shaft 82 supported on bearing 84 mounted to cabinet 34. The sprocket wheel 76 is held to the shaft 82 by a nut 86 and is free to rotate on the shaft 82.

The sprocket wheel 76 rests on its ring-shaped base 900 and its ring-shaped edges. Sprocket wheel 76 has at least one flat side 96 with readable mounting ft 80 thereon.

As can be seen from FIG.
6 rotates. Since the sprocket wheel 76 is allowed to rotate freely, the film does not stick to the sprocket 88 and damage to the film is minimized.

Readable device # to make the strobe lamp 66 emit light properly.
Preferably, 80 is a reflective mark line placed on every fourth sprocket. That is, for 35 mm film, four sprockets 88 represent the height of one frame. A readable device 80, for example in phantom, is provided on the flat side 96 around the periphery of the sprocket wheel 76. 1
In the case of 6mm film, the arrangement is different, and there are usually two tin rockets per frame.

A photocell 78 is attached to the housing 98 for reading. The housing 98 has a photovoltaic cell 78 connected to the sprocket wheel γ.
6 and the path of the readable device 8o, such as a rotating silver reflective line, on the lamphouse 36.

When the photocell γ8 is excited, a light beam 100 is directed outward as indicated by the arrow in FIG. If the light beam 100 does not hit a reflective object, there will be no trigger through line 74. However, as sprocket wheel 76 continues to rotate, light beam 100 strikes readable device 80, such as a silver wire, and is reflected back along path 102.

This reversal or reflection of the light beam is caused by the beam 12 passing through line 74.
As the sprocket wheel 76 is rotated by the powered take-up reel 26 pulling the . Depending on the time, the strobe flashes for microseconds.

Film speed is 300 feet (90 m) per minute
In this case, the strobe flash must be 4800 flashes per minute for a 16 dragon film with 32 frames per foot. If the film speed is 1 per minute
Down to 20 feet, the strobe flash is 19.20 flashes per minute.

Using a conventional high intensity strobe lamp 66, the image projection is very clear and allows quality inspection of the film as it exits the drying tank 14. Furthermore, the top 32 is moved to the screen 50 by a very high density pulse train that continues for a short time.
When projected onto , it appears to the naked eye as a continuous, unbroken series.

The preferred location of the projector 10 is near the drying tank 14 for ease of use, but it may be located remotely from the tank. In this case, the developed film is wound onto a reel 26 and the reel is transported to the location where the projector is installed.

Although the above embodiments have been described as the best presently available, they are not intended to be limiting, as they can be modified in many ways by those skilled in the art.

Accordingly, the scope of the invention is determined solely by the claims appended hereto.

[Brief explanation of the drawing]

FIG. 1 is a one-position environmental diagram illustrating the use of the projector of the present invention. FIG. 2 is a side view of the shutterless projector of the present invention through a film. FIG. 3 is a front view of the film and a portion of the film gate taken along line 3--3 of FIG. 4 is a partially cross-sectional view taken along line 4--4 of FIG. 3; FIG. 5 is a partially cross-sectional front view taken along @5-5 of FIG. 2; FIG. 10......Projector, 12...
...Movie film, 14...Drying tank, 38...Condenser lens, 40...Projection lens, 42...・
...Trigger device, 66...Strobe lamp, 76...Sprocket wheel, 7
8... Keinosuke Ozawa, patent attorney representing the photovoltaic applicant

Claims (9)

[Claims] (1) Complete film from ear to ear for inspection.
A shutterless inspection projector for motion picture film capable of rapidly and continuously projecting onto an EV screen to ensure proper quality across all frames of the film after development and processing, comprising: a projector housing; a lens arrangement mounted in the housing, comprising a condenser lens and a projection lens for projecting frames of the film; and a lens arrangement sandwiched between the condenser lens and the projection lens, through which the film to be inspected is projected. a shutterless film gate containing a window for a film frame; and a shutterless film gate in the housing behind and in line with the condenser lens and the projection lens and driven and stopped by the microphone for seconds. a strobe light device and said strobe light device #Z as each frame of the film passes through said window in order to confirm proper scanning of the film while maintaining the motion of the film by sequentially viewing a series of frames of the film; a trigger device in the housing that causes light to emit light to illuminate the frame and project it onto the screen; a power source controlled by the trigger device and forming a part of the strobe light device; A shutterless inspection projector comprising a film winding device separate from the projector and adapted to pull through a gate to a storage film reel. (2) The shutterless inspection projector according to claim 1, wherein the projector is placed behind a continuous film developing and processing device. (3) A shutterless inspection projection according to claim 1, wherein the film gate is a smooth plate holder having two spacing devices each having a window next to each other, there is no shutter, and the film passes between the plates. Machine. (4) The window has a width extending from the edge of one ear to the edge of the other ear of each frame of the film.
Shutterless inspection projector. (5)) A shutterless inspection projector according to claim 1, wherein the 1,1 device is controlled by the relative movement of the film through the projector 2. (6) a trigger device is attached to the nozzle;
The film gate includes a film sprocket wheel aligned vertically with the film gate, and the film rides on the sprocket wheel to increase the speed of film movement through the film gate (some of the tin rocket holes engage some of the sprockets to increase the speed of film movement through the projector). Claim 1, which rotates in accordance with
Shutterless inspection projector. (7) The shutterless inspection projector of claim 1, wherein the sprocket wheel has readable devices spaced around the sprocket wheel. (8) A photovoltaic cell is provided beside the readable device spaced apart from the sprocket wheel, and when the sprocket wheel rotates and is interrupted by the readable device spaced apart from the distance t, a photovoltaic cell is energized to cause the strobe light device to emit light. drive and synchronize the
A shutterless inspection projector according to claim 7. (9) The shutterless inspection of claim 8, wherein the readable device includes a number of circumferentially spaced reflective marks equal to the number of sprockets for one frame of the film. projector.