DE4124502A1 - Projection system for slides - has two projectors which can be rotated about their vertical axes - Google Patents

Abstract

A projection system for slides can be changed immediately from a fade out projection to a panoramic projection and vice versa. The system consists of two projectors mounted side by side on a common base frame. Each projector is mounted on a support rotatable about a vertical axis relative to the base frame. One support (8) is rotated directly by a handle (12). The two supports are connected by links which cause the second (7) support to rotate in the opposite direction to the first support. The handle is used for a rapid change from one mode to the other. A screw drive (18) enables a slower smoother change to be made. USE/ADVANTAGE - Projection system for slides. Has two projectors to provide change from fade out to panoramic mode.

Description

It is known that a slide sound image show with fade projection is becoming increasingly popular with the population. As the "non-plus-ultra" applies until now fully automatic ongoing slide sound image show with fade projection and musical framing (Leitz prospect "Panoramas - one fascinating dimension in photography and projection ", 310-135 (910 191) VII / 83 / DLY / w.), (Leitz brochure "TOP DIA projection ", 310-123a (920 049) XI / 84 / WD, p. 2), (Leitz brochure "Leitz cross-fade control units", 310-149 (910 343) VIII / 86 / 50,000).

The fully automatic slide sound image show with About projection, musical framing and others Effects, not only in the private sector as a hobby, but especially with the professional presentation in the areas of advertising (trade fairs, exhibitions), training (Industry, craft) and information (congresses, folk universities, community centers) are becoming increasingly important worth a (Heiner Henninges, LEICA R5, G + G Urban-Verlag, Munich, 1988, p. 159), (Guido Hähnel, slide sound presentation "SOUTH TIR0L - GARDEN OF GOD", 06.91), (Guido Hähnel, Dia- Lecture series of sound pictures "FASZINATION SCHWEIZ", 05.91).

Professionals and amateurs are familiar with the current world wide range of projectors and accessories as production tools for your creative work are still widely used satisfied because they have the possibility of combination Do not know "cross-fade projection + panoramic projection".

The American method for a panoramic picture projection, called "soft-edge-projection", in German: "Soft edge", (Leitz brochure "TOP DIA projection", 310- 123a (920 049) XI / 84 / LX / WD, p. 49) is not an alternative.  

Expert groups still take the view that:

• - With the "Panorama" projection, the projectors with one the largest possible distance next to each other must be (Leitz brochure "Panoramas - a faszi dimension in photography and projection ", 310-135 (910 191) VII / 83 / DLY / w.), Whereas the "About blend "projection the optical axes for extensive Coverage of the projection images lie "very closely" together (Leitz brochure "TOP DIA projection", 310-123a (920 049) XI / 84 / LX / WD, p. 51),
• - a "combination" of cross-fade and panoramic projection theoretically possible, but because of the high tech effort, including development costs can be realized.

The invention is based on the experience that in advertising events, lectures, etc., in the area "AUDIO- VISION "the advertising effectiveness with additional performances can be increased in the form of panoramic images. Because it at events of this type, however, mostly around pro acts professionally and professionally Range almost exclusively robust, for continuous operation designed projectors were used at the Elaboration of the invention as an example of this project gate type two Leitz projectors of the type PRADOVIT CA 2502 used.

The invention is based on the problem of the distance two projectors, the

• - in the cross-fading projection "very narrow", and
• - should be as "large" as possible in the panorama projection,

to select "so" on the slide projection image converter that at Both types of projection produce a good picture.  

The invention is based on the further problem that Change of direction of the optical axes of the two lenses as quickly as possible (important for users) and still with a simple construction (important for manufacturing and Price calculation).

The object is achieved with the features mentioned in claim 1 solved. Advantageous further developments of the invention result from the subclaims.

The advantages of this invention are:

• - simple construction
• - easy manufacture
• - light weight
• - low transport volume
• - easy operation
• - good image quality with cross-fading projection and panoramic projection
• - The "AUDIO-VISION" palette is enriched
• - Friends of slide sound pictures become new creative works motivated
• - a new economic factor arises, and
• - the economic success of the manufacturers of the new Slide projection imager is also used in the industry Projection screen manufacturers participate because one Panorama projection without a wide screen projection screen is not possible if a white wall is not used Available.

The slide projection image converter opens the medium "AUDIO- VISION "a new perspective.

An embodiment is shown in the drawings and is described in more detail below. Show it:

Fig. 1 Diaprojektions imager in the view,

Fig. 2 Diaprojektions imager in plan view,

Fig. 3 main support frame in the view,

Fig. 4 main support frame in the plan view,

Fig. 5 section "K L", Fig. 4,

Fig. 6 hand lever with controls.

The overall construction, consisting mainly of main The support frame and projector supports are made of square steel tube made. That is absolute torsional rigidity top priority. The only exception is the hand swivel lever.

Fig. 1 slide projection image converter in the view. The two projectors are - for better understanding - indicated by dash-dotted lines. The adjustable foot screw 1 prevents wobbling when the device is installed on an uneven floor. The two pins 2 and 2 a are used to snap into the upper part of a device tower 3 , if available. The free space 4 serves to accommodate the cross-fade control device. The adjusting screws 5 are used for height, and the adjusting screws 6 for tilt compensation of the projection images. Detail "D", Fig. 1a, section "EF", Fig. 2c shows the projector foot 10 immediately before placing the projector on the positioning pin 11 , which must be "dimensioned" so that the projector foot is not only free of play but tightly seated . Projector foot and positioning pin 11 are shown on an enlarged scale.

Fig. 2 slide projection image converter in plan view. The two projector supports 7 and 8 with their swivel arms 7 a and 8 a are rotatably mounted with the hinges 26 on the columns 29 and 29 a, FIG. 3. The hand swivel lever 12 is permanently connected to the projector support 8 . On the hand pivot lever, the holding lever 13 , the spring 13 a, Fig. 6, and the adjusting screw 18 are arranged. The spring 19 prevents the adjusting screw 18 from being inadvertently adjusted. The positioning of the swivel arm 7 a with spacer 7 b on the projector support 7 is shown in Fig. 2a, view "A" in Fig. 1 and in Fig. 2b, section "BC", on an enlarged scale. The angle results when the swivel arm 7 a rests on the ball bearing 9 , detail "G", and the Projektorträ ger 8 is parallel to the projector support 7 . The ball bearing 9 on the right swivel arm 8 a ensures smooth image conversion. Section "HI" in Fig. 2e shows the mounting of the ball bearing on the swivel arm 8 a by means of axis 20 , distance bushing 21 and locking spring ring 22nd The spring 23 with the compressive force of approximately 30 kp always presses the projector support into the "panoramic projection" position. The spring force can be varied with the adjusting screw 24 . The great force of the spring 23 is absolutely necessary for trouble-free pivoting of the heavy projectors, whereas the compression spring 25 , FIG. 6, with about half the force, only increases the ease of use. The hinges 26 , with which the projector supports are rotatably mounted on the columns 29 and 29 a, must not have any play, rather must be somewhat stiff. A drop of oil ensures sufficient mobility. The slightest play in the swivel mechanism leads to image projection disturbances.The size of the swivel angle of the two projector supports must be at least β ₁ = 10 ° and β ₂ = 15 °. Stop screw 14 limits swiveling to the right, spring 15 prevents unwanted adjustment of part 14 . Fig. 2d shows the arrangement of part 11 in portion 5 and 6.

Fig. 3 main support frame in the view. It shows the fixed feet 28, an adjustable foot 1, two columns 29 and 29 a, the hinges 26, an upper and a lower cross member 30 and 30 a, the female thread part 14 a drive screw for the adjustment, or to 14, as well as Stud 17 on the lower part 17 a.

Fig. 4 main support frame in plan view. It shows the main carrier 27 and 27 a, the cross struts 27 b and 27 c, the upper and lower cross struts 30 and 30 a, the hinges 26 , the nut threaded piece 14 a, the stud 17 on the intermediate piece 17 a, and stop member 18th b and spring bracket 25 b.

Fig. 5 section "KL", Fig. 4. Arrangement of the cross struts 30 and 30 a, and one of the struts 31 and 31 a, which help prevent vibration of the projectors, should the hand swivel lever strike hard when swiveling in an end position. The positioning of the nut thread piece 14 a for receiving the adjusting or stop screw 14 , the stud 17 with the intermediate piece 17 a and the stop part 18 b for the adjusting screw 18 can be seen.

Fig. 6 The hand pivot lever 12 is firmly and permanently connected to the projector support 8 , section "MN", Fig. 1. The holding lever 13 with spring 13 a holds the hand pivot lever and thus the projectors in any desired position. The adjusting screw 18 , mounted in the threaded part 18 a, fulfills several functions, which he explains in the "operating example". Spring 19 prevents unintentional adjustment of part 18 . The pin 25 a holds the spring 25 in position. The retaining pin 16 is rotatably mounted on the stud 17 , FIG. 6a, but without play, because the slightest play causes disturbances in the image change. The intermediate piece 17 a is arranged on the cross strut 27 c and serves as a height compensation so that the retaining pin 16 comes to lie exactly in the center of the bore in the retaining lever 13 . The adjusting screw 18 has a "round washer" at one end, FIG. 6b, which increases the ease of use.

The hand swivel lever 12 is the only exception in which "U-profile" is used instead of square steel tube, FIG. 6c, section "OP".

Operating example

Slide projection imager.

The operation of the slide projection image converter is very good easy.

• - When starting with normal image or cross-fade projection, the hand pivot lever 12 is pivoted to the right until both images are congruent. In this position, the stop screw 14 is turned up to the hand pivot lever 12 . Height and inclination errors are eliminated with the adjusting screws 5 and 6 , possibly with the help of the projector feet.
• - When changing the image from the normal image to the panoramic image, the second projector lamp on the cross-fade control unit is first switched on and then the holding or clamping device is released by pressing the holding lever 13 on the handle of the hand swivel lever, the hand swivel lever swings to the left, i.e.: it is given the spring pressure of spring 23 until both pictures result in a panoramic picture. In this position, the adjusting screw 18 is turned clockwise until it stops at part 18 b.
• - Now both end positions are fixed, so that a screen del from normal image to panoramic image projection or conversely "with one hand" is possible.
• - With a large projection distance, the projectors can finally be pivoted by turning the adjusting screw 18 , which results in a "soft" image change.
• - Minor image errors in the center of the panorama are eliminated with the adjustment screw 18 . For this reason, this screw is equipped with a "round washer", which can be easily gripped with the fingers of the right hand and adjusted with great care.

Claims (10)

1. slide projection image converter for the immediate transition from the cross-fade projection to the panoramic projection when using two projectors, characterized in that the smallest possible distance between the projectors arranged next to one another remains unchanged. The projectors rest on two projector supports, which are rotatably mounted around their vertical axis. A rotating or swiveling mechanism changes the direction of the optical axes of the two lenses in such a way that from a normal picture a panorama picture or a normal picture is created in the opposite direction of swiveling. The swivel mechanism is designed so that only the right projector bracket ( 8 ) is swiveled with the hand swivel lever ( 12 ). The left projector support ( 7 ) automatically pivots in the opposite direction because its swivel arm ( 7 a) is pressed against the ball bearing ( 9 ) of the swivel arm ( 8 a) by the force of the spring ( 23 ). The ball bearing ( 9 ) ensures smooth, jerk-free image conversion. With the hand swivel lever ( 12 ) a faster or "hard" image change is achieved, whereas with the hand crank of the adjusting screw ( 18 ) a "softer" image change is possible, which was particularly advantageous when the projection was larger. For a quick and at the same time precise correction of image errors in the center of the panorama - image overlap or dark stripes - the "round disk" ( Fig. 6b) attached to the adjusting screw ( 18 ) is used, which allows a fine correction with tact. The adjusting screws ( 5 ) and ( 6 ) are used to align the projection images according to height and inclination. The exact positioning of the projectors on the projector supports, ie: the tight penetration of the positioning pins ( 11 ) into the projector feet ( 10 ), FIGS. 1a and 2c, prevents the projectors from slipping when swiveled quickly. The adjusting screw ( 18 ) also serves to limit the swiveling in the direction of the panoramic projection. 2. slide projection image converter according to claim 1, characterized in that the slide projection image converter "universally" can be used when it is fitted with two "UNIVERSAL CARRIER PLATES", the underside of which are the projector supports ( 7 ) and ( 8 ) and whose Top can accommodate the various projectors of the brands introduced on the market. 3. slide projection image converter according to claim 1, characterized, that the invention generally also in such projectors applicable where "two" lenses in "one" Housing are housed. 4. slide projection image converter according to claim 1 and 3, characterized, that the slide projection image converter even with automatic Sound image controlled by tape or cassette device show / audio lecture can be used, with the only switch on and off at any given time the second projector lamp and swiveling by hand are to be carried out.   5. slide projection image converter according to claim 1, 3 and 4, characterized, that switching from the cross-fade projection to the pano rama projection and vice versa, as well as the on and off switch the second projector lamp on the crossfade control device, no longer by hand, but z. B. electronically controlled in a "logical sequence" electromechanically is performed.