JPS6018055B2 - strip projector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION BACKGROUND OF THE INVENTION This invention relates generally to filmstrip projectors;
More particularly, the present invention relates to an improvement in a filmstrip projector adapted for use with a tape having recorded audio messages to accompany the visual content of the film.

Film strip projectors are widely used in educational fields as well as sales promotion and other fields. This medium is particularly suited for purposes such as presenting selected illustrations for different times depending on their information content, thereby preserving the amount of footage.
It is clear that the interest and usefulness of the visual display is greatly increased by simultaneously presenting synchronized audio messages. The illustrated embodiment is particularly suited for projection of 35 skin film, but is useful for other sizes as well.

However, a special feature of 35-skin film strips is that the standards for implementation have not been very well formulated throughout the industry. Regarding this point,
The sprocket holes used to drive film in cameras and projectors are not consistently spaced at predetermined intervals with respect to individual frames or images on the film strip. Because of this characteristic, it is not possible to index the film frame into the projection aperture using the simple existing sprocket hole arrangement. Initial framing alignment must therefore be achieved manually.
The film sprocket holes on a particular film strip are precisely located with respect to the location of every film frame on that particular strip, thus ensuring consistent framing of each frame throughout the entire roll of film after initial framing is achieved. To ensure this, the film drive mechanism must be extremely accurate. A feature of the invention is a removable film strip projector including a light source and a device for projecting an image, a cabinet having a base for mounting the light source and the projection device; a collapsible cover for configuring a self-contained projector, pivotally mounted on said base movable between an open position for displaying; said collapsible cover movable between a closed position and a viewing position; a projection screen pivotally mounted to the base; a reflector pivotally mounted to the base movably between a closed position and a viewing position, the movable end of the reflector being coupled to the cover; and is supported in its visible position at an angle necessary to subtend the angle between the projection screen and the direction of passage of the image so as to reflect the image from the projection device onto the rear surface of the projection screen. It is equipped with a reflecting mirror designed to reflect

DESCRIPTION OF THE EMBODIMENTS A general description of the operation of the internal screen film strip of this invention will assist in understanding the operation and concepts utilized by the projector.

The interior screen film strip projector is shown at 30 in FIG. The projector consists of a cabinet 34 including a top cover 36 and a base 38. A handle 39 is attached to the top of the cover 36 to facilitate transport of the projector 30. The front wall of the cover 36 comprises a rear projection screen 40 onto which the visible image is projected from behind or from within. Mounted within the base 38 is a standard stereo or two track audio cassette tape recorder 42, which has been slightly modified for use with the filmstrip projector of the present invention.

A combination film strip and audio tape cartridge 44 (FIG. 5) is located within a tape recorder 42.
is loaded and the film strip is positioned to feed into the projector 301. Combination cartridge 44
When the first frame of the filmstrip is loaded, the first frame of the filmstrip is transferred to the selectively operable framing device 48 (the first
(FIG. 1), it is framed with respect to the projection closure 46.

Framing device 48 has a manually operable knob 50 that extends through the front wall of the base and can be rotated while the film strip is being viewed on screen 40. The film strip projector 30 is energized by placing the on/off switch 52 on the front of the cabinet in the "on" position, thereby projecting the image of the frame centered in the projection opening 46 onto the screen. .

Tape recorder 42 is activated by depressing one of a plurality of control buttons 56, thereby starting the audio tape to be played. Tape recorder 42 provides audio accompaniment to the filmstrip with a first track carrying an audio message for a particular frame. For feeding the film, preferably a film drive device 58 (FIGS. 11 to 14), which will be described later, is provided. A second track of the audio tape carries a film advance signal for advancing the filmstrip through the projector. When the film advance signal is generated, the film drive (FIGS. 11-14) advances the filmstrip one frame through the projection gate 46. The audio tape drive is completely independent of the filmstrip drive, allowing it to play any length of audiotape associated with a particular filmstrip frame before the filmstrip is advanced to the next frame. can. The image from the film strip frame is transferred to the first reflector 60 (FIG. 2).
directed upwards.

Reflector 60 then directs the image onto a second reflector 62 which then reflects the image onto the rear surface of screen 40. Screen 40 is generally translucent, made of frosted glass, plastic, etc., and provides a clear image for viewing from the front of filmstrip projector 30. The tape recorder 42 is slidably mounted in a pull-out configuration on a pair of horizontal rails 66 and moved to the front of the base 38 for loading a cartridge 44 and then moved to the front of the projector 38.
It can be retracted to the position shown in FIG. 1 for operation.

Since it is desirable to prevent movement of the tape recorder 42 while a portion of the film strip is passed through the projector, a locking mechanism is provided to prevent tearing or jamming of the film. More specifically, a lock release button 68 is provided at the front of the base (FIG. 1);
Button 68 releases the tape recorder for forward movement. However, the locking mechanism prevents actuation of button 68 when the film is threaded through the projector.
Once the film has been rewound into the cartridge 44, the lock button 68 is depressed and the recorder can be moved forward for cassette removal. moreover,
As detailed below, the film strip projector 30
has various other operating characteristics. The cartridge 44 for use in the film strip and audio tape projector 30 is shown in detail in FIGS. 3-6 and includes a cover portion 74 (FIG. 3) and a base portion 7.
6 (Figure 4).

The base 76 has a generally planar chassis 80 that includes a pair of depending parallel cassette retaining side walls 8.
2, and these side walls work together to provide normal audio
It is designed to firmly receive a tape cassette 84 (Fig. 5). In order to hold the cassette 84 in the normal position,
A retaining spring 86 engages a pair of spring guides 88 defined by the contour of cassette retaining wall 82 . The chassis 80 of the base 76 has a pair of openings 90 that allow the audio tape drive spindle 92 (
FIG. 2) fully engages the cassette drive spool 94 (FIG. 5). The upper surface of chassis 80 carries a pair of spaced apart film guide flanges 98 .

The flange 98 generally terminates adjacent the curved front wall 10. An inwardly disposed surface of front wall 100 abuts two spaced pairs of sprocket guides 102 . Each pair is formed adjacent one edge of the front wall 100 and serves to positively drive the film strip. This will be discussed later in connection with the cover 74. The outer sprocket guide 102 extends into a curved film guide flange 112 which prevents the film strip from separating from the sprocket 162. As the film strip is rewound into the cartridge, as the end of the film strip approaches the sprocket, the film deflects downwardly against the top of the film guide flange 112 and away from the sprocket teeth 170. The sprocket holes dislodge from the sprocket teeth to prevent complete tufting of the film strip. When feeding the film strip into the projector during start-up, the sprocket teeth 170 pull the filmstrip up from the guide flange 112 into full engagement with the sprocket teeth. Flange 98 is formed with a pair of hinges or pins 110 at an end opposite front wall 100 for cooperative engagement with cover 74. The film cartridge cover 74 has a pair of side walls 120 and a rear wall 122.
, a front wall 124 and a rear wall 126, which define a filmstrip storage cavity 128.

Inside the cover 74, a pair of arcuate elastic springs 140 are installed.
A film holding device in the form of is arranged and the spring 14
0 serves to maintain the film in proper relationship to the cartridge.

The spring is made from elongated metal strip or other suitable material. One end of each metal strip is bent in opposite directions at 142 to prevent scratching the film emulsion as the film exits the cartridge. The other end of the metal strip is bent into a sharp reverse curl and positioned within a spring receiving slot 144 located in the rear wall 122 of the cover. Adjacent to the spring receiving slots 144, each side wall of the cover includes a hinge hole 1.
60, and the hinge hole 160 engages the hinge pin 110 of the base 76 to pivotally connect the cover 74 to the base 76. This hinge allows the cartridge 44 to be conveniently opened for changing filmstrips, and a locking notch 108 cooperating with a crossbar 104 in the wall 100 prevents accidental opening. cover 74
A film drive spool 162 is rotatably supported within the cartridge, and the spool 162 drives the film through the cartridge.
It plays the role of driving the strip.

The reduced end of the film drive spool 162 is bearing supported within a gate 164 provided in the side wall 12 of the cover 74. Film drive spool 162 has a central hub 166 and a pair of parallel spaced apart sprocket flanges 168 at opposite ends. Each sprocket flange 168 carries a plurality of sprocket teeth 170 spaced apart for engagement with sprocket holes provided along the green portion of the film strip.
The sprocket teeth 170 are aligned with the sprocket guide 102, as described above, and as the film passes through the cartridge, the traverse of the film moves along the sprocket guide 102 so that the sprocket teeth 170 properly engage the filmstrip. It looks like this. The inside of the hub 166 is hollow, and the frame advancement device 5
8 and defines a splined receiver 174 for engagement with the splined receiver 174. This will be explained in detail later. Within the cover, adjacent to the film drive spool 162, is a front wall 1.
A pair of film spool guides 176 are mounted on the film drive spool 162.
prevent inappropriate movement around the This condition can occur as a natural result of curling of the emulsion on the film strip itself. On the same machine, there is a guide strut 178 between the film spool guide 176.
is inherent, such that the film is fed vertically out of the cartridge without following its natural forces.
The projector projection system, except for the screen 40 and the second reflector 62, is substantially mounted within the base 38 of the projector 30.

The mechanically operating components of the projection system are preferably mounted on a single integrally molded chassis 180 (FIGS. 7-10). The chassis can be manufactured by die casting or other suitable methods.

Details of the molded chassis will be discussed below in connection with FIGS. The sheath 180 is a generally vertical main mounting web 1
It has 82. The mounting web is circumferentially defined by a reinforcing flange 184 that is integrally formed with a pair of horizontal rails 186 and a small rail 188 seen on the left side of FIG. Rails 186 and 18
8 mounts the chassis 180 into the base 38 of the projector. From the web 182, there are two mounting posts 19 in the front.
0,192 stands out. Post 190 has three support fins 194 and post 192 has one of the fins 186.
is formed adjacent to. The operating parts mounted thereon are a framing device 48, a film drive device 58
, and an image generating beam system 202 (FIG. 9). The light beam system includes a light bulb 204 mounted on flange 182 adjacent to a condenser lens assembly 206 (FIG. 9).

Condenser lens assembly 206 is removably mounted on chassis 180 and is easily removed for cleaning. Assembly 206 includes two convex lenses 2
It has a four-sided frame 208 on which 10 is attached. One wall of the frame 208 has an upwardly projecting tab 212 for attachment to the flange 82 by easily removable screws. The top wall of the frame 208 has two rearwardly projecting tabs 214 that are connected to the flange section 82.
It engages a pair of spaced apart, horizontal, forwardly projecting bosses 216 formed thereon to ensure proper alignment of the lens 210. Lens assembly 206 is positioned adjacent to gate 46 and directs a beam of white light through the gate and, therefore, through the frame of film strip disposed therein. The light image is then reflected by the mirror 22. Mirror 220 is mounted to flange 182 at an angle of 450 to reflect the image through lens 222 (FIG. 2). The lens 222 is mounted within a lens opening 224 formed in the flange 182.

The image is then reflected by a first reflector 60. The reflector 60 is attached to a mirror support stand 226 fixed to the chassis 1801.
is mounted on top. The image reflected by the first mirror 60 is passed to a second reflector 62 supported between adjacent cover discs that define the range of angle of refraction and from there directed to the rear surface of the screen 40. Referring to FIGS. 1 and 2 of the audio system, tape recorder 42 is slidably mounted on guide rails 66, as described above, so that tape recorder 42 can be moved outwardly for cartridge insertion and then film strip. may be sent back to feed the projection system.

As previously mentioned, the lower portion of cartridge 44 carries an audio tape cassette 84, which is received by the recorder in the conventional manner. A locking mechanism is provided to hold the recorder in the position shown in FIG. 1, thereby preventing withdrawal of the recorder when the filmstrip is in the projection system.
In this aspect of the invention, it is not necessary to describe the actuating parts of the locking mechanism, but simply put, when the film strip is fully drawn into the cartridge 44, the locking mechanism actuating button 68 is depressed. The recorder can now be released for forward movement. Referring to FIG. 2, the recorder 42 has a single multi-contact jack 2.
30 to the conventional control circuitry, and a jack 230 is plugged into the rear of the recorder 42 and transmits all the necessary signals from the recorder to the control circuitry and vice versa.

A retaining strap 234 is fastened to the bottom of the recorder 42 with a stud 236 on the inner surface of the base portion 38 to prevent complete removal of the recorder from the base 38 which could unplug the jack 230 and damage the control circuitry. . The control circuitry is of the conventional type, with signals from the audio tape directing the film drive 58 after the completion of each audio message associated with a particular frame.
advances the filmstrip one frame. The circuit also includes an automatic stop device activated by another signal on the audio tape to completely stop operation of the projector 30 and prevent film advancement. This operation occurs, for example, when the film is used in an educational environment where it is desired to allow the user time to pose questions and respond in writing or orally. When using the automatic shutdown device, it is necessary for the user to restart the user system after preparing the answer. In a conventional film strip projector, the film strip cartridge 44
The large barrier in the front of the projector for insertion of the film made the device unsightly. In this invention, a cover door 240 is provided to artistically disguise the sekiguchi. Referring to FIG. 15, plates 242 include a generally flat, rectangular plate 242 at the door 24.
is pivotally mounted on the top of the recorder behind the control button 56. A hinge pivot pin 244 is supported on the recorder by a bracket 246 and passes through a hinge hole in door 242. A retaining spring 246 is mounted on the recorder behind the pivot pin 244 and is mounted on the flat surface 248 of the door.
and maintains the door in the closed position. door 242
A small cam 250 engages the retaining spring when the is released. The closed position of the door is shown in solid lines in FIGS. 1 and 2, and the open position is shown in phantom in FIG.
After the film guide cartridge is placed inside the projector, the film is
Framing device 48 moves between a pair of spaced parallel plates 260, 262 mounted on chassis 180 and defining projection gateway 46.

Due to the natural curl of the emulsion, the film is forced into the stereotaxic plane between the plates during manual operation of the framing device 48, as described below. During projection, film is advanced through film chute 264 and then into storage retainer 266.

The film chute 264 consists of a pair of slotted film guide rails 270.
0 is arranged to receive the film passing between the open lobe plates 260 and 262. A slotted film guide rail is mounted within a pair of adjacent keyhole slots 272 in chassis 180. Film retainer 266 is mounted on chassis 180 by a pair of flat surfaces 274 provided therefor and provides an internal cavity in which the film curls into a spiral and coiled configuration due to the natural curling forces of the emulsion. will be maintained. Framing device as mentioned above, film
A regular feature of the strip is that the practical standards are not currently well established and the location of the sprocket hole does not have a predetermined relationship to the location of the frame or image on the film.

Therefore, the first frame of film must be properly positioned relative to the projection opening 46 before the film is automatically advanced by the film drive 58. After that, the shape of the sprocket wheel 162 and the position of the sprocket teeth 170 are changed. 1' of butt 162
Accurately index the film strip to advance frames every 4 or 90° rotations. Thus, as will be discussed in more detail below, the film drive 58 is connected to the subrocket 162.
is rotated exactly 900 revolutions to advance each section or frame of film through the aperture 46. Figures 11-14,
With particular reference to FIG. 11, the selectively operable framing device has a manually operable knob 50;
protrudes through the front of the base 38 for access by the user.

Framing knob 50 is framing rod 280
The rod 28 is fixed to the rod 28 and is supported by a bearing within the opening 282. Journal 282 is mounted on a rear surface 284 of a generally hollow boss 286 that is integrally formed with chassis 180. A selectively engageable coupling in the form of a straight tooth positive clutch 290 is provided adjacent the inner end of framing rod 280 . Clutch 29 includes a gear drive 292 and a slotted receptacle 294 . The drive device 292 is secured to the framing rod 2801 and the slotted receiver 294 is secured to the bushing 2801.
A rod 280 is rotatably supported within the pusher 296 by a bearing. A drive gear 300 is mounted on the slotted accommodation device 294 and meshes with an idler gear 302.
The idler gear 302 is bearing supported within a closure 304 formed in the rear wall of the hollow post 286 and a second aligned opening 306 formed in the tab of the web 182. A shear cutting device 308 is provided on the side wall of boss 286 to provide clearance for idler gear 302 to engage framing gear 310 . Idler gear 30
2 is engaged with a framing gear 310 secured to an output drive shaft 314 by a set screw 312. The drive shaft 314 is bearingly supported within a closure 316 formed by the chassis 1801 by a sleeve bearing 318. Drive shaft 3
14 also has a motor mounted blade 3 at its rear end.
20, and the plate 320 is attached to the chassis 180 by a pair of rearwardly protruding shield bolts 322. Each tank bolt 322 includes four fin-shaped support flanges 324 for added strength and rigidity. The front end of the drive shaft 314 is a cartridge.
It carries a tapered clutch section 328 for engaging the splined portion of the film spool 162.

Clutch member 328 includes an elongated spline 330 for engaging spool 162. Clutch member 3
28 is movable within a splined portion 332 of the drive shaft and biased forwardly by a spring 334, thereby positively engaging the film spool 162, as previously described. A drive gear 340 for the film drive device 58 is rotatably mounted on the drive shaft 314 behind the framing gear 310.

A curved spring washer 342 is disposed between the drive gear 340 and the framing gear 310 to
The gear 340 is gently pushed away from the framing gear 310. Drive gear 340 has a rearwardly extending shaft portion 344 that terminates in an enlarged circular flange 346 .

A clutch spring 348 is wound around the drive shaft 314 behind the flange 346 to engage a thrust washer 350 with a pushing 352 which connects the rear end of the drive shaft 314 to the plate 320.
I have one installed. Drive gear 340 and framing
The engagement surfaces between the gears 310 are ring gears 354 and 354, respectively.
Contains 356. The clutch spring 348 continuously urges the ring gear 354 of the drive gear 340 into engagement with the ring gear 356 of the framing gear so that the drive gear 340 rotates the framing gear 310 during normal operation, as described below with respect to the drive gear 58. It looks like this. However, during initial framing operations, ring gears 354 and 356 must be separated and the drive
It is desirable that shaft 314 be rotated independently of film drive 58. To accomplish this, a clutch lever 360 is used that is pivotally coupled to a stud 361 mounted on a horizontal flange 362 on the bottom of the chassis 180. The clutch lever 360 is connected to the circular flange 3 of the driving gear 340.
A vertical flange 364 is provided for engaging 46. The clutch lever extends horizontally to the left as viewed in FIG. 11 and engages the rear end 366 of the framing rod 280. Pushing the framing knob 50 inward causes the clutch arm 36 to rotate clockwise as viewed in FIG.
The ring gears 354 and 356 between 340 are separated.

As a result, the framing gear 310 and the driving gear 34
0 rotates freely separately. In use, framing knob 50 is pushed into the base of projector 30 and engagement of straight tooth positive clutch 290 occurs.

At the same time, clutch arm 360 rotates clockwise about its pivot, releasing the driving engagement between drive gear 340 and framing gear 310. knob 50
When the gear 300 is rotated in its pushed position, the gear 300,
Therefore, the idler gear 302 rotates, and the gear 30
2 rotates the framing gear 310. The drive clutch member 328 rotates together with the framing gear 310, and the framing gear 310 is connected to the film spool 1.
62, the film is selectively advanced. The film strip is then attached to the actuating plate 260.
, 262, so that the desired image is properly framed. Film Drive Device Although the film drive device itself is not included in the scope of the present invention, it is preferably constructed as follows.

Specifically, the film drive is shown in three positions in FIGS. 12, 13, and 14, and in plan view in FIG. 11. The drive is powered by a reversible DC motor 380 (FIG. 11) mounted on the motor plate 32. Motor shaft 382 is plate 3
20 and supports a small pinion gear 384 for driving film drive 58. in general,
The film drive is a Geneva type drive in which the continuous rotational output of the drive motor 380 is converted into a 90° rotational motion of the output drive shaft 314. More specifically, the drive device 58 includes a first reduction gear 386 that is bearing-supported within a bushing 388 that is mounted within an opening 390 formed in the boss 284. This reduction gear carries a small pinion gear 392 that meshes with pinion gear 382 and engages index-lock gear 394. Index-lock gear 394 is similarly bearingly supported within a pusher 398 mounted within a closure 400 formed in boss face 284. The indexing lock gear 394 includes a full gear portion for engaging the pinion gear 392, and a partial gear having only two toothed portions 404 on either side of the rotation axis in its forward reduced diameter portion (12th figure). The remainder of the gear is a sterile cylindrical surface 406 with a diameter approximately equal to the depth of the gear teeth 404. Two rearwardly protruding index control pins 408 are mounted on the rear side of the index-lock gear 394 and are adapted to de-energize the drive motor 380, as described below. Index-lock gear 394
In particular, partial gear portion 404 engages drive gear 340 to rotate it.

More specifically, drive gear 340 (FIGS. 12-14) includes four identical sectors. Each sector is indexed −
It includes a plurality of gear teeth 412 for engaging gear teeth 404 of the locking gear.

A toothless cam lock device 4 is provided between each set of gear teeth 412.
14 are provided. Each cam includes two spaced nipples 416. Includes nipple 416.

Nipple 416 has a cylindrical surface that is substantially equal in diameter to cylindrical surface 406 . When tooth 412 is not engaged with tooth 404, cylindrical surfaces 406, 416 are in sliding engagement as seen in FIG. When the drive motor is energized by a control circuit that receives a signal from the audio tape, the index lock gears 394 move to the 12th, 13th, 1st
Rotate counterclockwise as shown by arrow A in Figure 4. Index - Lock gear has first and last teeth 40
A clearance device or spacing notch 420 is provided adjacent to gear 4 to provide a clearance path for nipple 416 when both gears rotate simultaneously.

FIG. 12 shows rotary gear 394 just before teeth 404 engage teeth 412. FIG.

Continuous rotation of the index-lock gear 394 causes the teeth 404 to
412 engages with each other, thereby driving the gear 340.
Rotate in a clockwise direction as shown by arrow B in FIG. Subsequent rotation causes teeth 404 and 41 to
2 disengages the subsequent cam 414 and each nipple 416.
engages the cylindrical surface 406 opposite the tooth 404 . cam 4
14, one of the pins 408 engages a pivot-mounted deenergization stop lever 424. pin 40
8 causes lever 424 to be raised and contact button 426 of microswitch 428, thereby deenergizing motor 380 and energizing the motor braking circuit. The lever 424 has an elongated pin engagement surface 430 to provide a predictable amount of motor pin engagement. Accordingly, the motor is energized by the control circuit and deenergized just after the drive shaft 314 has completed exactly 900 revolutions, thereby moving the next frame into the projection aperture 46.

Thus, after the first frame is placed within closure 46, accurate framing is maintained throughout projection of the entire length of the filmstrip. After projection of the film, motor 380 is reversed to drive the film drive in the opposite direction, thereby rewinding the film into cartridge 44. Alternative embodiments of the projector 30 of the present invention are Nos. 16 to 20.
As shown in the figure.

This embodiment is a portable or collapsible version of the invention. In alternative embodiments, like numbers refer to like parts. One advantage of the alternative embodiment is that the screen 40 and mini-cover 480 are foldable. Referring to FIG. 16, the cover 480 includes a pair of latches 482 for securing the front portion thereof to the base 38.

A flexible handle 484 is attached to the cover and serves as a convenient carrying handle. The cover is shown in the folded or closed position in FIG. 16 and in the folded or closed position in FIG.
It is shown in the figure with an open position. Referring to FIG. 18, the cover is pivoted to the rear of the base by a hinge 486 so that it can be opened and closed. A flexible band 487 connected between the cover and the rear of the base prevents excessive rearward movement of the cover when the cover is opened. The four screens are mounted within a frame 488 which is pivoted to the front of base 38 by hinges 490 and hinge pins 491. To open and use this portable model, the cover is specially raised and
The screen is then rotated to a generally vertical position, as seen in FIG.
(Fig.) is fixed to the cover. The second reflector 62 is also pivoted to the base by a hinge 492 and is collapsible. The upper green part of the mirror 62 is the maneuverability band 4
93 connects the cover 48 to allow a greater angle of rotation than is required of the mirror 62 when the cover 480 is closed. In the open position, band 493 maintains mirror 62 at an angle such that the image is accurately reflected onto screen 40. Screen frame 488 has two partial side walls 496 that extend rearwardly when the screen is in the upright position and overlap a portion of the base when the screen is in the closed position.

Locking device 494 includes a pivot-mounted, pointed or arrow-shaped lever 498 that is pivot-mounted to the upper corner of each side wall 496 by a pin 50. The lever 498 is connected to the arcuate slot 5 in the side wall 496.
04 is provided with an actuation pin 502 extending through it. A coil spring 505 is wrapped around the pivot pin 500, with one leg extending downwardly to engage a portion of the screen 40 and the other leg extending rearwardly to engage the actuating pin 502.

The spring 505 continuously presses the lever bar 498 upwardly when the cover 480 is lowered onto the frame 488.
One of the pair of hook-shaped surfaces 506 engages a generally rectangular slot 508 formed in the bracket 51 mounted on the cover 480'. When the cover is locked to the stereotaxic layer, as shown in Figures 18 and 20, the handle can be conveniently grasped for transporting the rock-mountable model in the open position. The arrangement of the handle is such that the center of gravity of the components of the base of the portable model is substantially directly below the handle in the open position, thereby allowing the device to be conveniently transported without tipping or collapsing. When it is desired to close the cover, such as for storage of the portable model, locking device 494 is released and the screen and cover are folded into the closed position (FIG. 16).

However, to prevent damage to the screen and other components, a projection screen brake 516 is provided to prevent the screen 40 and frame 488 from abruptly closing. More specifically, brake device 516 includes a brake rod 518 pivotally coupled to frame 488 at one end. The braking rod 518 passes through the opening □ formed by the elastic braking element 52 and connects to the base 3.
It's in 8. Braking element 520 is formed from plastic or other resilient flexible material and includes T-shaped taps 522 at each end for engagement within a pair of slots 524 formed in the base. When the screen 40 is lowered, the brake rod 518 passes through the gate and rotates against the plastic brake element 52, and the deflection of the brake element 520 increases the frictional force and adjusts the movement of the rod 518. This frictional force supports the screen in virtually any angular position, thereby preventing damage to the projector 30. This portable model also has an additional feature that prevents light from light bulb 204 from interfering with the image.

Referring to FIG. 18, the screen 40 is tilted approximately 50 degrees rearward relative to the vertical axis. Accordingly, a pivot-mounted light shield 530 is provided and the light bulb 204
This prevents light from hitting the screen 40' and blurring or deforming the image. More specifically, in FIG. 18, beam shield 530 includes a generally flat plate pivotally mounted on hinge pin 491. In FIG. This hinge pin is shared with the hinge 490 to which the screen 40 is attached. Thus, the bulb can be easily replaced by rotating the ray shield upward, and any stray rays from the bulb will not hit the screen 401. The above detailed description is provided for clarity of understanding only and should not be considered as limiting the invention as various modifications will be apparent to those skilled in the art.

Embodiment 1 A cover 36 is generally secured to the top of the screen 40 to lock each element in the open position.
2. A film strip projector (30) as set forth in claim 1 including a selectively operable latching device (494) on said film strip projector (30).

Embodiment 2 Apparatus 434 for positioning handle 484 in an open position on a vertical line generally passing through the center of gravity of the film strip projector
With a handle 484 mounted on the cover 36, the projector 30 can be closed or folded by grasping the handle 484 without having to close or fold the projector 30.
A portable film strip projector according to claim 1, wherein the film strip projector is adapted to be easily moved.

Embodiment 3 In order to prevent stray light from the light source 204 from hitting the screen 401 and deforming or blurring the image, the light source 2
04 and the projection screen 40.
2. A portable filmstrip projector as set forth in claim 1, wherein said beam shield 530 is pivotally mounted to base 38 to provide access to the light source for removal and replacement of light source 204.

Embodiment 4: A removable film according to claim 1, wherein a projection screen braking device 516 is provided to prevent inadvertent sudden closing or rotation of the screen that could damage the screen 40. strip projector.

Embodiment 5 The braking system includes a brake rod 51 that is pivotally connected to the screen at one end and passes through a flexible elastic brake pad 520 mounted on the base 38.
8, such that when the screen 40 is rotated downwardly toward the base 38, the brake rod 518 slides through the brake pad 520 and the friction between the brake pad 520 and the brake rod 518 causes the brake rod 518 to rotate downwardly toward the base 38. 5. A portable film strip projector according to embodiment 4, wherein the motion is damped.

Embodiment 6 A brake rod 518 is pivotally mounted to the projection screen 40 and its pivot end moves along an arcuate path during closure of the screen 40, thereby creating a gap between the rod 518 and the brake pad 520 during closure of the screen 40. The narrow angle formed increases and the brake pad flexes as rod 518 passes over brake pad 520, causing rod 518 and pad 5 to flex.
20. The removable film strip projector according to embodiment 5, wherein the nose of friction generated between the projector and the film strip is varied.

Embodiment 7 A clearance device 420 includes a detent 420 formed adjacent each end of segmented arcuate toothed portion 404 for cam lock device 414 to engage cylindrical surface 406 of drive gear 394. A pair of spaced protrusions 416 are included, the engagement protrusions 416 being the toothed portions 416 of the drive gear 394.
4 protrudes radially outwardly a distance greater than the gear teeth on drive gear 394 such that the protrusion 416 engages the clearance device 420 and securely moves the cam lock device 414 to close the drive gear 394.
4. A projector 30 according to claim 3, wherein the projector 30 is adapted to engage a cylindrical surface 406 of the cylindrical surface 406 of the projector 30.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front perspective view of a film strip projector according to the present invention. FIG. 2 is an enlarged cross-sectional view taken along line 2-2 in FIG. 1. FIG. 3 is a perspective view of the cover of the film cartridge of the present invention. FIG. 4 is a perspective view of the base of the film cartridge of the present invention. FIG. 5 shows an assembled film containing an audio tape cassette for use with the present invention.
FIG. 2 is a perspective view of a strip cartridge. FIG. 6 is a sectional view taken along line 6-6 in FIG. 5. FIG. 7 is a rear perspective view of a molded chassis for a filmstrip projector. FIG. 8 is a rear perspective view of the molded chassis. 9 is a front elevational view of the molded chassis of FIG. 8; FIG.
FIG. 10 is a right side elevational view of this molded chassis. FIG. 11 is a plan view of the film drive device. FIG. 12 is a sectional view taken along line 12--12 of FIG. 11, showing the film drive device in a position before drive engagement. FIG. 13 is a cross-sectional view taken along line 12-12 of FIG. 11, showing the film drive in a drivingly engaged position. Figure 14 is from 12 in Figure 11.
FIG. 12 is a cross-sectional view along line 12 showing the film drive system in a position after drive engagement has ended. FIG. 15 is an enlarged vertical cross-sectional view of the film cartridge cover door of FIG. 2; FIG. 16 is a perspective view of an alternative movable model of the filmstrip projector of the present invention, shown in the closed or movable position. FIG. 17 is a perspective view of the portable model of FIG. 16, shown in the engaged or activated position. FIG. 18 is an enlarged cross-sectional view taken along line 18-18 in FIG. 17. FIG. 19 is a partial perspective view showing the screen braking device for the foldable screen of the portable model of the present invention. FIG. 20 is a partial perspective view of the screen latch lock device of the portable model of the present invention. 30...Projector, 34...Cabinet, 36...Cover, 38...Base, 39...
...Handle, 40...Screen, 42...Tape recorder, 44...Cartridge, 46...
...Projection Sekiguchi, 48...Framing device,
50... Knob, 52... Switch, 56... Control button, 58... Film drive device, 60, 62... Reflector, 66...
Rail, 68...Lock button. Kei, Z, Tomo 9.2. 〆〆〆〆〆〆〆〆〆〆〆〆〆〆〆〆〆〆〆〆〆 6- -Meta・5・・Love. S-Z harp. a. false. 9. ZZ evening. -Anti-9,〇. Monoyama, Hitoshi 9〃 JZ9. Honai 9. Nezuru. ”6. Fake Shigeru, Igumo. Round. J8

Claims (1)

[Claims] 1. A portable film strip projector 30 comprising a light source 204 and an image projection device 202, a cabinet 34 having a base 38 for mounting said light source and said projection device; a closed position for storage and a film strip projector 30; a collapsible cover 36 for forming a self-contained projector pivotably mounted on said base for movement between a closed position for viewing the strip; a projection screen 40 movably pivotally mounted to the base; a reflector 62 pivotally mounted to the base movably between a closed position and a viewing position, the movable end of the reflector being pivotally mounted to the cover; coupled to and moving with the cover to define an angle necessary to subtend the angle between the projection screen and the direction of image passage to reflect the image from the projection device onto the rear surface of the projection screen. A portable film strip projector comprising: a reflecting mirror supported in a visible position;