JPS5964823A - Overhead type projector - 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 an overhead projector and further includes a projection lens. A certain type of Tata
It consists of a base, a power source, and a ventilation device, and a casing receptacle column for housing the lamp and holding the projection lens is fixed to the base.

Various manufacturers manufacture various types of this type of overhead projector. Each of these overhead projectors has a single plate as a base, and an object to be projected is placed on this plate. This plate is placed below the plated Fresnel lens. When a transparent object is placed on this plate, the object is projected directly. It is also possible to use this projector to project opaque objects in a reflective manner. The edges of this plate, generally one corner of this plate,
One column is fixed.

This column holds a casing, which houses the light source consisting of a lamp, a curved mirror, and a condenser (condenser lens), and in Eve's case the power supply is used as a base. It is installed in a box above or below the functional plate, which is a disadvantage. This is because the size of the device becomes larger than necessary, and it is necessary to provide a ventilation device for cooling the power supply section and another ventilation device for cooling the lamp. In some types, however, the power supply is co-located in a casing that houses the light source and the projection lens. However, this too proved to be disadvantageous. This is because the weight of the casing increases considerably and it is therefore necessary to make the column particularly stable, such as by providing supports between the column and the casing. In many cases,
This casing also adds weight. This is because, in addition to the projection lens for overhead projection, a separate projection lens for direct projection is provided in this casing, as well as a guide slide for direct projection.

However, the disadvantage of making the column stable and immovable is not only that it increases the cost and weight of the overhead projector. This is due to the fact that the fixation of the column to the base plate must be extremely strong, and the location where this weight resides is quite far from the fixation point. This is because, due to this, a moment of considerable magnitude acts on the fixed location. However, in general, the columns are not as strong as desired and are prone to vibration, which tends to reduce the sharpness of the image.

As described above, since the connection between the column and the casing must be strong, conventional efforts have been made to strengthen this connection.

The column can also be coupled to be pivotable relative to the casing, but this is only the case with overhead projectors of the type in which the light source is located below the lighting plate. This type of direct-light overhead projector with a rotatable column is used with a trunk-type portable device and is particularly suitable for being carried when traveling. In this type of case, it is not easy to prevent the column from vibrating.

Unfortunately, when using a projector while traveling, there is a problem that the system voltage varies depending on the country. For example, in Germany, 220 volt alternating current is normally used, whereas
In modern America, 110 volt alternating current is common. Some European countries use 110 volts and 130 volts. In other regions, direct current is common. Commercially available projectors are usually made to be compatible with only one system voltage and only one type of current, so when you are planning to give a lecture in a foreign country, you may have to worry about the difference in current or voltage. A situation may arise in which a projector brought from one's home country cannot be used.

The present invention provides a solution to the above problems. An object of the present invention is to make an overhead projector of the type mentioned at the beginning smaller and easier to handle.
The aim is to find possibilities for an arrangement that makes it lighter and, above all, takes up less volume when packed.

The key point of the present invention is that the power supply section is housed within the column. By doing so, the construction form is extremely compact, resulting in a projector that is easier to handle, lighter, and has a smaller volume.

It would be advantageous if the conductor no longer needed to extend into the base.

A ventilation system for the lamp and/or power supply reservoir is provided inside the column, and at least a portion of the column is provided with at least one inlet and one outlet.
It is particularly advantageous if it is constructed in the cold aisle. The advantage of this construction is that the weight of the overhead projector is reduced, due to the fact that the existing hollow columns act as cold air passages. The installation of the power supply and the ventilation device within this column results in the weight of these parts being arranged much more favorably than if they were installed within the casing housing the projection lens and lamp. . because,
This is because the weight of the power supply section is mostly located at the joint between the column and the base, so the generated moment is no longer as large as in the past. The weight of the power supply is much more advantageous than before, since it is vertically above or almost vertically above the connection point. Another advantage of such an arrangement is that it provides favorable thermal placement. That is, the power supply no longer experiences heat radiation from the lamp.

This very advantageous arrangement of the power supply in the column makes it possible to connect the column and the base by means of a plug-in coupling device. This has the advantage that when transporting an overhead projector, the column can be easily removed and packing can be carried out much easier and better than in the past. This plug-in coupling device row can then be made very simply.

This is because the coupling device requires only mechanical coupling and does not require any electrical coupling parts. Furthermore, this embodiment provides the advantage that different types of bases can be used for this overhead projector.

For example, the base can be a plate that functions as a writing plate, or it can still be a square or have a U-shaped shape. If the base is a writing plate, the part of the coupling device that belongs to the writing plate is located in the center of one side of the writing plate. If the base is a square ruler, the part of the coupling device that belongs to the base is in the center of one side of the ruler. If the base has a U-shaped configuration, the part of the coupling device that belongs to the writing plate lies in the central region of the central leg.

It is also possible for the base to be built into a writing, physical or other work desk.

For travel purposes, it is advantageous if the base is provided with a coupling device for the column sump. All parts of the overhead projector will then be fixed together and come together during transportation. These coupling devices can be magnets, by means of which the column can be kept fixed to the base during transport.

It is particularly advantageous if the column consists of two parts connected at an obtuse angle to each other. Of the two parts, the lower part houses the power supply and the upper part houses the lamp. The free end of the upper part holds the projection lens.

It has also proven particularly advantageous if the column consists of three parts connected at an obtuse angle to each other. Of the three parts, the lower part houses the power supply, the middle part houses the ventilation device, and the upper part, which holds the projection lens at its free end, houses the lamp. By doing this,
The weight distribution of the individual parts becomes particularly advantageous, and at the same time the cooling of the individual parts becomes particularly advantageous and expedient. This is because the air flowing through the power supply follows a different route than the air cooling the lamp, and the two routes are kept in flow by the same ventilation device.

In this embodiment, it is advantageous if the exhaust port is provided outside the middle part of the column.

In order to be able to use an overhead projector for as wide a variety of purposes as possible, it is advantageous if the substantially vertical part of the column is made vertical and a device is provided for adjusting the length of the column. be. In this way, for example, in a physics class, there will be a leaf placed one by one on a desk, a thick book on the same desk, and a physics experiment conducted using equipment on a flat surface above the desk. can be projected as an image of the same quality.

In order to be able to adapt the projector of the above construction to any system voltage, it is advantageous if at least the input step of the power supply is designed to be replaceable.

By doing so, it is possible to adapt the projector to the respective system voltage by simple replacement of components; This exchange is done through a plug-in method. If the projector is to be used in a country where the system voltage is different from that of the home country, the input step can simply be pulled from the projector and replaced with another input step that matches the system voltage of the country. This procedure is extremely easy and anyone can do it.

In this case, the input step is made into a pluggable component and has a plug to be inserted into the socket of the power appliance, and the input step is a separate part smaller than the casing of the power appliance, i.e. of the projector. It is particularly advantageous if it is installed within the casing.

The casing of the input step is preferably cylindrical or rectangular. This is because such shapes are easier to grasp and handle. The casing itself protects the user from the risk of electric shock from touching live parts when plugging in the input step. In this case, it is advantageous if the projector casing has an opening for inserting the input step casing, and when the input step casing is inserted, the input step casing protrudes slightly outside the projector casing. The input step can be replaced with a similar input step adapted to the local voltage or current. In order to facilitate this operation, it is advantageous if the end of the casing of the input step opposite the plug is shaped like a knob.

This input step can have a plug with various contacts. Wiring of these contacts is performed as follows. That is, some of the plug pins or contacts have no partner to couple with, while only one or a few certain plug pins or contacts couple to each other so that the system voltage is present. Only certain plug pins or contacts, via which the system voltage is sent to certain parts of subsequent steps or certain subsequent steps. Note that it is advantageous to provide an electronic component for changing the voltage in this input step. In this case, it is advantageous to provide at least one resistor within the casing of the input step. It is also advantageous to provide a fuse in the casing of the input step.

This fuse can be easily replaced when the input step casing is removed from the projector.

In order to indicate whether the correct input step is being used, a lamp is provided in the casing of the input step, on the side of the casing opposite the plug, i.e. the side normally used as a knob. It is advantageous to make it translucent.

In that case, various appropriate table connections provide a lamp indication as to whether the correct input step is being used. If it is desired that the lamp be turned on when a correct input step is entered, the translucent part of the casing would be made of a green translucent material, for example, and the lamp would be used as a ready-to-use indicator lamp. Conversely, if you want to indicate that an input step has been selected incorrectly, you can dye the translucent material red, for example, to indicate that the voltage is too high or too low for the electronic components to function properly. A circuit connected to the lamp is formed so that the lamp always lights up when the above situation occurs. It is also possible to provide two lamps and dye the material of the casing wall in front of these lamps in different colors, for example red and green.

That way, by the color of the lighted lamp, you will know whether the power is on or not and what voltage is coming, i.e. whether it is the right voltage for the power appliance to function. be able to.

If the column is divided, it is advantageous if the divided parts are connected to each other with a plug-in coupling device and the input step is plugged into one of the ends of these parts. In that case, a window may be provided in the end face of the column housing the input step, through which the input step or its casing can be seen and a voltage display or lamp can be seen.

Often, the lamp burns out while projecting, and you have to replace it with a new one.

At that time, if the projector has already been used for a long time, the burnt out lamp will be so hot that it cannot be replaced without using some auxiliary means. There are a variety of such aids, including a cloth to grip the lamp, but there are also breakaway devices, which allow the hot lamp to break free and fall into the projector's casing. The lamp is then left there until it cools down. However, none of these auxiliary measures is satisfactory.

In order to solve the conventional inadequacies regarding this problem, it is advantageous to install the lamp in one frame. This frame slides on a guide rail provided inside the casing and moves in and out of the opening of the casing.

This frame also holds electrical contacts,
These electrical contacts are in contact with corresponding contacts provided inside the casing when the frame is housed in the casing.

When attached to this projector, the frame and lamp are pulled out through the opening of the casing and replaced with another frame. When the lamp cools down, it is removed from the lamp inside the frame and replaced with a new lamp. In this way, a burnt-out hot lamp can be replaced with a new one by simply removing and inserting the frame. This replacement operation is completely safe and there is no risk of burns to the user. Because one of the frame rungs is
:) It's made in 4i or has a knob so you don't have to touch the lamp directly. By pulling the burnt out hot lamp out with its frame, the hot lamp no longer remains inside the projector casing, as is the case with conventional breakaway devices.

It is preferable that a contact pin is provided on the crossbar on the side opposite to the twister. Another possibility for electrical connection is to have at least one of the crossbars of the frame carry a surface or surface portion made of conductor as a contact surface.

Particularly in the latter case, the guide rail of the frame reservoir is conductive and forms a corresponding contact, via which
It is advantageous if the current necessary for igniting the lamp flows through contact surfaces provided on the crosspiece of the frame.

-1, it is advantageous to have a reflector in the frame together with the lamp. That way, not only lamps but also
The reflector will also be replaced at the same time.

It is particularly advantageous if means are provided in the frame for adjusting the relative position between the lamp and the reflector. This makes it possible to adjust the relative positions of the lamp and the reflector outside the projector, for example already at the manufacturing stage. Furthermore, this type of frame is a very inexpensive component, and if inexpensively manufactured reflectors are used, it can be constructed as a commercially available part as a single unit.

Regarding lamp replacement, the present invention has the following advantages. In this case, replace the lamp as follows. That is, the frame is extracted from the casing of the projector, rotated 180 degrees, and then inserted into the projector again. When two lamps are placed side by side, the thickness of the frame can be reduced at the expense of increasing the width. On the other hand, if two lamps are placed one behind the other within the window of the frame, the frame will be more compact but will be thicker. Depending on the given conditions within the projector, either of the above two possibilities can be adopted.

In this case as well, it is advantageous if a reflector for each of the two lamps is provided in the frame. 2
When two lamps are placed side by side in the window of the frame, the back surface of the reflector and the lamps will be seen side by side on each side of the frame. When two lamps are placed one behind the other in a frame window, the two reflectors are located between the two lamps. In this case, it is advantageous if the two reflectors are located closer to two mutually facing surfaces of one object. This object is 2
located between two lamps. It is also advantageous if the frame and the object are made in one piece with two reflectors. Furthermore, it is advantageous if the freezing part of the frame is attached to the frame in a non-thermal manner.

When two lamps are installed in one frame, the electrical contacts are arranged asymmetrically with respect to the geometrical axis or the extension of the intermediate plane, so that only one lamp is lit at any given time, while the other It is best to keep the lamp in reserve.

By installing the power supply in the column and by providing the projection head in the column as a unit assembly, 1.
This makes it possible to turn one projector into a device that can be used for a variety of purposes. Using this apparatus, not only overhead projection and slide projection 1 but also microfilm projection can be performed. Going even further, while projecting onto a wall, this projector
The device allows slides and microfilm images to be viewed on a desk plate, so the speaker can
When projecting a slide or microfilm, you no longer have to repeatedly twist its head to face the audience or face the projected image.

The key point of the present invention is that all eight parts of the projector can be assembled into a single assembly.

In other words, the column is the base plate or base.

Attached to the casing provided under the plate 1
, the glodiectadhenode is also attached to the column by a quick coupling or a bayonet connection.

In one possible embodiment, attached to the column by a bayonet connection or quick coupling,
Alternatively, the projection head with an attachable projection lens for overhead projection can be exchanged for another projection with a slide projector or even a microfilm projector. In another embodiment, a projection head equipped with a projection lens for overhead projection is further equipped with a microfilm projector and a slide projector by plugging or quick connection. Can be mounted with a coupling.

With the above configuration, all three types of objects to be projected (overhead projection sheet, slide, and microfilm) can be projected using only one device. This not only makes it possible to project these three types of images at low cost, but also significantly reduces the space required by the speaker.

The unit assembly design of the device allows the user to purchase individual parts one after the other.

Inside the projection head, its beam is directed on the one hand to the base plate;
On the other hand, it is particularly advantageous if the microfilm projector is installed such that it can be directed toward a wall. This allows the still image projector to be used simultaneously as a microfilm reader. and,
This reading device 1 projects onto a blank sheet of paper and makes it possible to simultaneously write on this blank sheet while the microfilm is being projected. In this case, the microfilm reader can place the microfilm on a blank sheet of paper. Such advantages are generally obtained by mounting the microfilm projector within a projection head as described above, and not by a unit assembly system. The above advantages apply whether the microfilm projector is installed in the projection head completely fixed to the column or installed in the projection head which is connected to the column in an exchangeable manner. , which can be obtained similarly.

A similar effect is obtained if the light beam of the slide projector is directed on the one hand onto the base plate and on the other hand onto the wall. In this case as well, the slide projector can be used as a slide viewing device. This observation device, unlike conventional ones, allows the observer to draw on paper, film, etc. during projection, so it is possible to draw the projected image on paper, film, etc. can. Again, the advantages mentioned above do not derive from the fact that they can be assembled into unit assemblies, but rather because the projection head is either completely fixed to the column or interchangeable, similar to when a still image projector is used as a microfilm reader. Is it possible to install?
It has nothing to do with that.

In microfilm projectors and slide projectors of the type in which the light beam can be directed at the base plate or at the wall, particular advantages would be obtained if the light beam could be directed at both the base plate and the wall at the same time. That is, in that case, the projected microfilm or slide image is projected by the speaker onto the 111 double plate of a still image projector while the eyes of his entire audience are directed toward the line. , can be seen. A speaker sitting in front of an audience does not have to twist his head and turn his head between the image projected on the wall and the audience. The speaker only has to slightly change the direction of his or her gaze when looking at the projected image or toward the audience. To perform such simultaneous projection, a rotatable mirror, a
Boundary, partially translucent mirror, moved onto the beam of light;
Alternatively, it may be advantageous to provide a partially plated prism body which partially splits the light beam. By using a mirror or a partially plated prism body that partially splits the light beam (c), on top of that, from a microfilm project,
It becomes possible to project images onto both the base plate and the wall. If the mirror is rotatable or can be moved into the beam, the image is projected onto either the base plate or the wall, which is not possible with a microfilm or slide projector. It is likewise possible to attach the projection head on the column via a pivotable device.

Structurally, first, the microfilm projector, slide projector, and overhead projection lens are installed in separate projection heads, and these projection heads are connected to the same quick coupling part or plug-in coupling part. It is advantageous to have

In particular, the head of the microfilm projector, the head of the slide projector and/or the head for 1D overhead projection can each be provided with a quick coupling similar to that provided in the column. Then, for example, by attaching an overhead projection head to the column (7), this projector can be used for packing purposes, by projecting a microfilm image onto the base plate and transmitting it to the overhead projection head. It is possible to project the image onto the wall via the . Then, the speaker can draw pictures or write on the microfilm image, and the pictures and letters that are added will be projected onto the wall and appear. The audience and spectators can visually follow the appearance of pictures and letters.

The same thing happens when a slide projector head and an overhead projector head are attached to the column at the same time.

The object of the present invention further obtains the force formed in the following manner. i.e. slide projectors whose casing is supported on the base plate or even beyond the base plate on a mounting surface and can be inserted by means of electrical contact pins into a column opening with a connecting terminal behind it. will be established.

The projector can be easily disassembled into parts, and all these parts can be packed into one bag or one small trunk. A particular advantage of this projector is that the head for overhead projection and the slide projector are powered by the same power supply installed in the column.

Since a blower with a low voltage motor is used to cool the light source of the overhead projection head as well as the light source of the slide projector, the system voltage is present only in the column, and all contact pins inserted into the column are
Whether it's a contact pin for an overhead projection head or a contact pin for a slide projector.
Passes only low voltage. Another advantage of this projector is that it can be made to extremely small dimensions.
Especially the dimensions of the writing plate are 15 Crn.
It is only 15cm x 15cm, or 10z x 10z.

Of course, if the size of the writing plate is reduced in this way, all other components will be reduced as well. In other words, it can be made much smaller than the conventional case. Therefore, for overhead projection and/-
! It is advantageous to use a direct current motor to cool the light source for or slide projection.

When installing a slide projector, the base plate preferably extends beyond the writing plate as an installation surface for the slide projector.

Still, if the column has an opening for the contact bin sump of the slide projector above its lower end and an opening for the contact bin sump of the projection head in front of its upper end or at the upper end itself (overhead),
It's advantageous.

In that case, it is advantageous if the spacing of the contact bins for the slide projector is different from the spacing of the contact bins for the projection head. This is because it is then impossible for an amateur or even a child to connect the projection head or slide projector by inserting it in the wrong position on the column.

There are three preferred methods of mounting a head for overhead projection. In the first method, this projection head is inserted into the side of the column.

In that case, the column preferably has a projection below the upper contact opening, the shape of which is adapted to the shape of the head, so that the head is better supported on the column. A second method is for the head to be inserted into the upper end of the column from above with its contact pin oriented substantially vertically downward. In the third method,
A contact bottle is provided in the head with the contact bottle facing diagonally downward.

The installation of the power supply in the column and the possibility of inserting the column into the base make it possible to create a work desk that is particularly suitable for use in meetings. At this work desk, each person seated at it can use an overhead projector. What's more, this overhead projector won't take up space on your desk or block your view.

The desk described above is obtained by providing at least one support in the plate of the desk, into which the columns for overhead projection as well as the pivoting mirrors associated therewith are inserted.

By doing so, a work desk having a structure in which only the column of the overhead projector is inserted into a support provided on the plate of the desk can be obtained.

Overhead projector columns take up very little space. It also hardly obstructs your view. Column sump supports can be provided next to each workstation, so each conference participant can have one overhead projector next to his or her workstation. By using this, it is possible to explain using diagrams to all the people present. Alternatively, a column of overhead projectors could be provided between the two workstations at the desk. If arranged like that, 2
Several attendees will be working together using one overhead projector.

The column of the overhead projector is structured so that it can be inserted into a support provided on the desk and later pulled out, so that the conference desk can be adjusted according to the number of attendees. In other words, there will never be a situation where there are as many overhead projectors installed on desks as there are attendees.

Advantageously, the support and the part of the column inserted into the support are provided with contacts for electrical connection. This way, the connection conductor for the projector's light source will be located only on the underside of the conference table, instead of having the conductor extending above the desk, like when using a traditional overhead projector for a conference. That will no longer be the case.

Advantageously, on the surface of the table plate, next to the support, there is a recess for accommodating a plated Fresnel lens. These Fresnel lenses will then be placed in the same plane as the desk surface, and work by attendees using an overhead projector will always be in the same plane, i.e. the desk surface. This will take place within the surface of

If the back of the plated Fresnel lens is made of the same material as the surface of the desk plate, use the plated Fresnel lens only in the working area of the conference table where the overhead projector column is inserted. With the lens visible, you can turn it over 1d in the inserted, untwisted part of the column so that the part made of the same material as the surface of the desk is on top.

It is advantageous if the light source can be directed both at the plated 71/Lenelle lens and at the desk surface next to the 17)7Lenelle lens. By doing so, the nuclear light source not only functions as a light source for overhead projection, but also for lighting the production area.

Typically, when a meeting is held, attendees at least partially
They are seated facing each other.

In that case, it is advantageous if each column has two projection lenses and two pivoting mirrors, which are oriented in separate or (, -1 opposite directions. , a single overhead projector can project in two directions, i.e., on two opposite walls in a conference room. When seated, each row of attendees can see the 1C projected image in front of them, thus giving them the advantage of not having to turn their heads to look. be.

The following description will be made with reference to the drawings. First, the overhead projector shown in FIG. 1 has an extremely flat writing plate 1. As shown in FIG. A column 2 is fixed to the center of one side 1-11 of this writing plate 1, and this -j column holds a projection head 3 which holds a projection lens 4. This column 2) 7L
, consisting of a substantially vertical portion 2A, a horizontal portion 2C, and an intermediate portion 2B connecting these portions. This column 2 is made of a tubular body with a rectangular cross-sectional shape. As a fixing device, it is possible to use one or two iron plates 5, which are somewhat narrow at the ends, and which are attached to the legs of one U-shaped member whose central part is fixed to the writing plate 1. The tubular column 2 is placed over the member (iron plate) 5 from above, and the outer surface of the member 5 is in close contact with the narrower one of the inner walls of the column 2, while the legs of the member 5 are The end of
It comes into close contact with the wider inner wall of column 2.

In this way, a very simple insertion is completed, and the purpose of the connection 1d is now completely achieved. However, this plug-in connection may also be performed in other ways.

Inside the vertical section 2A of the column 2, parts of the power appliance are installed. This power supply transforms the system current into a supply current suitable for the lamp 6 in use. This power supply device consists of an electronic transformer 7 and a double coil 8. In the lower area of the section 2A (d) to which the system connection conductor 9 is connected, there is provided a trench and an air inlet 10 for cooling various parts of the power supply appliance.

A light source is installed inside the column portion 2C.

The light source consists of a lamp 6, a reflecting mirror 11, and a condenser 12. Since the capacitor 12 is installed inside a pivotable socket, it can be pivoted and moved away from the area in front of the lamp when replacing the lamp.

A ventilation device 13 is provided inside the portion 2B that connects the vertical portion 2A and the horizontal portion 2C. It is discharged from the exhaust slit 14 provided in the. In order to admit air for cooling the lamp 6 into the horizontal part 2C of the column, an intake slit 15 is provided in this part 2C.

The ventilation device 13 is driven by a motor 16, and
The projection lens holder 3 holds a rotating mirror 17.

The projection lens holder 3 is attached to the column part 2C by a link 18 and can be pivoted during transportation into an advantageous position as shown in FIG. In order to prevent the column 2 and projection lens holder 3 from separating from the writing plate 1 during transportation, the writing plate 1 is provided with a fixing device. These fixing devices may consist of magnets provided on the back side of the writing plate 1;
This is the case when the column 2, like the projection lens holder 3, is made of ferromagnetic material.

In Figures 5 to 7, another embodiment is shown.

The same reference numerals are given to the same parts as in the previous embodiment. In this embodiment, the writing plate is made into a trunk for transportation. The writing plate consists of two parts 20, 21, which are connected to each other by links. In the embodiments shown in FIGS. 1 to 4, the column 2 was adapted to be placed over the fixing device 5 from above, but in this embodiment a section is provided at the lower end of the column 2. A plug-in horizontal end 22, substantially perpendicular to 2A, is provided, thereby providing a mechanical connection of the column.

The side wall 23 of the trunk section 20 has the horizontal end 22
A housing portion 24 is provided which fits into the housing. Inside the trunk part (box) 20, a fixing device σ is provided to keep the column 2 and the projection lens holder 3 away from the inner wall of the box 20.

Holder 3 holding column 2 and projection lens 4
is stored in the box 20, the box 2 acts as a lid, so to speak.
1 is rotated around the link, and the trunk is closed. and a rotatable perforated tongue piece 2 on one side.
By passing the pin 26 on the other side through the hole 5, the boxes 20 and 21 are locked and the travel packing is completed.

The column serves as a handle for the overhead projector as well as a cord winding device. That is, as shown in FIG. 3, a cord winding roll 30 is installed inside the column, and the connecting cord 9 is automatically rolled up by this roll.

0't) The column is further provided with operating elements. These components 1d include an input/output switch, a switch for operating the zoom projection lens by a motor, an operating switch for precise adjustment by the motor, and a switch for replacing the lamp by the motor in some cases.

The Fresnel lens incorporated in the writing plate is preferably protected by a diaphragm. In the case of embodiments in which the writing plate is a two-part container, it is advantageous for the two-part Fresnel lens to be protected by a cover plate.

The overhead projector shown in Figures 8 and 9 has a two-part column. These two
The two parts 2A and 2B are combined by inserting the plug 27 into a hole provided in the end face of the part 2A. The projection head 3 is integrated into the part 2B of the column by inserting two plugs, which are not visible in the drawing, located on opposite sides of the figure, into holes 29 on the part 2B of the column. An electrical contact is provided behind the hole 29 for electrical connection with the inserted plug. An input step 30 of the power supply device is inserted into the end face 28 . The plug 31 of the input step 30 is then inserted into the socket belonging to the power appliance inside the section 2A of the column. The position of this socket is such that the input step 30 projects somewhat upwardly from the end face 28.

Therefore, the user can pull out the input step by pinching the protruding part and replace it with another input step. The lower end of the column section 2A is provided with a dovetail bar 32 which fits into a similar cavity in the base plate. FIG. 9 shows the projector of FIG. 8 assembled and ready for use, and shows the ribbed cap from the side. In this state, the input step 301d, the M portion of the column 2A, 2
It's hidden inside B.

Figures 10 and 11 show another embodiment of an overhead projector. Components common to the previous embodiment are given the same reference numerals. An opening 34 is provided in the part 2A of the column that accommodates the power supply, into which the casing 35 of the input step is inserted. The casing 35 is provided at its end opposite the plug 31 with a translucent cap 44, behind which a lamp 38 connected to the socket 36 is provided.
will be installed. This lamp 38 has a control switch 37
Current flows through. The control switch 37 is, for example,
The lamp 38 is illuminated if the system voltage does not match the predetermined voltage of the input step. Inside the casing 35 of this manual step, a fuse 39, two resistors 40, a transistor 41 and a capacitor 42 are further provided.

The casing 35 is inserted into the opening 34 until the plug 31 is mated with the socket 43 in the part 2A of the column. The distance between the socket 43 and the starting end of the opening 34 is determined by a portion of the input step, at least the cap 44
protrudes from the portion 2A, and is determined to such an extent that it can be pinched with fingers.

The projection head 3 of the projector shown in FIG. 13 is provided with an opening 45, and a frame 46 is inserted into the opening 45 so that only the knob 47 thereof is exposed. inserted.

The frame 46 consists of four crossbars surrounding the window 55. A socket 48 is provided inside this window 55, and the lamp 6 is connected to this. A knob portion 47 is provided on the outer side of one of the four crossbars.

In the embodiment rows shown in FIGS. 14 and 15, a contact pin 49 is provided on the crosspiece opposite to the crosspiece on which the knob portion 47 is provided, and this contact pin 49 is inserted into a socket provided inside the projection head 3. be done. Although guide rails are not required in this embodiment, it is also possible to provide rails 49 on the outer side of the longitudinal crosspiece and insert them into guide rails in the head.

In the embodiment shown in FIG. 16, the frame 46 includes a reflector 50 in addition to the lamp 6. In the embodiment shown in FIG.

In this example, at least one adjustment screw 51 is provided to adjust the relative position of the reflector 50 and the lamp 6. In this example, rail 52 is made from a conductor. Each of the rails 52 is connected to a lamp contact via conductors not visible in the figure. Instead of the conductor rails 52, it is also possible to provide the frame 46 with other types of contact surfaces.

As shown in FIG. 17, the frame 46 is inserted into a guide rail 53 also made of a conductor. This guide rail 53 has elastic contacts, so that good contact between the rail 52 and the guide rail 53 is always maintained.

FIG. 18 shows an embodiment of a frame with two lamps 6. In this example, inside the window 55 of the frame 46,
The two sockets 48 are juxtaposed, and thus also the two lamps 6 are juxtaposed. In this case as well, a knob 47 is provided at one end of the frame, and a contact pin 49 is provided at the other end. The socket 56 containing the opposing electrical contact of the contact pin 49 is arranged asymmetrically with respect to the geometrical axis 57 of the frame. This allows current to be sent to only one lamp. If the lamp to which the current was being fed fails, the frame can be removed from the projector, rotated 180° about its geometric axis 57, and then inserted back into the projector. The contact pin of the non-faulty lamp will then enter the socket 56 and current will be sent to the non-faulty lamp.

In the coffins 19 and 20, 1 indicates yet another embodiment. In this example, the frame 46 is made of a member made by casting or pressing, and each of the left and right sides of the member is provided with one reflecting mirror, and one lamp is provided for each of the left and right parts. It will be done. From this figure 19, Id,
Lamps 6 and 1 [Only the same lamp can be seen because the other lamp is hidden behind the back of the reflector.

Embodiment frame 46, the cross section of which is shown in FIG.
The body 59 is made in one piece or by pressing, and consists of a body 59. 21 fixed lamp 6 and two reflecting mirrors 50
The Ids are juxtaposed in the window of the frame, so they are placed one after the other.

The frame shown in Figures 19-21 differs from the frame shown in Figures 13-18 in that it is closed by a mirror 50 opposite the window opening. While the former has only one window, the latter has two windows, which open in opposite directions.

Instead of referring to it as a frame, member 46 can also be referred to as an insertable lamp retainer. What is shown in FIGS. 13 to 18 can be called a frame-shaped lamp holding member, and what is shown in FIGS. 19 to 21 can be called a block-like lamp holding member. The latter has two cavities opening on opposite sides, in which sockets and lamps are installed, the inner wall behind them being made into a reflector.

In the embodiment shown in FIG. 22 (d), a microfilm projector 61 is connected to the column 2 by a quick coupling 60. This microfilm projector 61 includes a light source in one casing,
It has a built-in projection lens and a stand for placing the microfilm to be projected. The microfilm is put into the projector 61 through the slit 62.

The optical axis 63 of the projection lens of the projector 61 is directed downward. The optical axis 63 passes through an optical redirection device 64 provided in front of the projection lens of the microfilm projector 61. This optical redirection device is 1
A translucent rotating mirror is provided inside the casing. This rotating mirror has axis 6
5, and takes approximately the same position as the manual lever 66 that rotates it. By this optical direction changing device 64, a part of the light beam is changed to light M67 in the figure.
The image is projected onto the wall □□□ via the window 68 according to the route shown by . Other light rays pass through the window 69 and are projected onto the writing plate 1. Therefore, the speaker can see the same projected image on the base plate even when sitting with his back to the wall on which the projection is made. Still, as the speaker turns his attention to the audience,
There's no need to twist your head and look for it.

The user still has to use this still image projector (projector)
can also be used as a microfilm reader. That is, when the manual lever 66 is turned clockwise to the vertical position, no light will come out from the window 68 and all the light will be directed toward the lighting plate 1. If paper, film, or the like is placed on the base plate 1, drawing or writing can be performed on it; for example, the outline of a projected image can be traced and copied. That is, this reading device 4 can be used for various purposes other than reading.

In the embodiment shown in FIG. 23, a nozzle 70 for overhead projection is attached to the ram 2 and has a ring. This head 70 holds a projection lens 4 for overhead projection and a rotating mirror 17 at the top that can be rotated around a link 18, but the light source there is a lamp 6, a condenser 12, It consists of a reflecting mirror 11. This light source illuminates the surface of the writing plate 1, but a sheet for overhead projection is placed on top of the writing plate 1, and the sheet is projected by a Fresnel lens installed inside the writing plate 1. be done.

This overhead projection head 70 has, on the side opposite to the column 2, a quick coupling part 72 similar to that provided on the column 2. This quick coupling portion 72 makes it possible to further connect the microfilm projection head 61 to the overhead projection head 70, as shown in FIG. In this case, the column 2 will also hold a microfilm projector 61 in addition to the overhead projection head 70. When performing projection, it is preferable to use the following operation. That is, first, the manual lever 66 of the microfilm projector 61 is brought to the vertical position so that all the light beams of the microfilm projector 61 come out from the window 69 and toward the base plate 1, and no light comes out from the window 68. Dry like that. thus,
By using the microfilm projector 61, most of the Fresnel lenses installed on the base plate 1 are illuminated, and the light energy reflected by these plated Fresnel lenses passes through the optical axis 73 to the projection lens for overhead projection. 4, and is projected onto the wall by the rotating mirror 17. By placing a transparent overhead projection sheet on the base plate 1, the user can draw or write on the projected microfilm image. The microfilm shadow itself is then unaffected by such a writing operation and remains intact.

The scribbled writing simply remains on the blank overhead projection sheet. Also, while performing this task, the speaker can look at the audience without having to turn his or her head back.

In the embodiment shown in FIG. 25, a slide projector head 74 is connected to the still image display column 2 by a quick coupling 60. This slide projector head 74 is located at the front side in the figure.
It has a magazine 75 for storing a slide 76. The slide 76 is pushed into the slide projector 74 by a slider 77. Inside the slide projector head 74, in addition to a pedestal on which the slide 76 pushed in by the slider 77 is placed, a light source (not shown) and a projection lens (also not shown) are provided. ing. A direction changing device 64 is attached in front of this projection lens, and this device 64
For example, it is the same as that used in the embodiment described above.

That is, the image is projected onto the wall surface through the window 68 (a), while it is projected onto the base plate 1 through the window 69. In this case, the speaker uses the microfilm projector 61
The work can be done in the same manner as in the case of . That is, the same image projected onto the wall surface can be simultaneously projected onto the base plate 1. Good luck, manual lever 66
If it is made vertical, it can be used only for the purpose of observing slides without projecting onto the reservoir.

A slide projector 74 can also be used simultaneously with the overhead projection head 70, as shown in FIG. In this case, the speaker shuts off the light source attachment 71 and uses the light for overhead projection that is provided by the slide projector head 74 and is directed entirely toward the base plate 1 when the manual lever 66 is turned vertically.

Various types of couplings, such as bayonet couplings and threaded couplings, can be used as the coupling 60.

In the embodiment shown in FIGS. 27 and 28, the slide projector 78 is also supplied with current by the power supply in the column 2. , are made as pluggable components, in which case two contact pins 79
is inserted into the hole provided in the column. This slide projector 79 is a structure extending in the longitudinal direction, and extends from the side opposite to the contact pin 79 to the leg part 80, and the leg part 80 is parallel to the base plate 1 and extends from the installation surface. supported above. However, this leg part 80 is not necessarily necessary, and the slide projector 7
81d, is supported with its bottom surface 81 on the surface of the base plate 1, even if it extends beyond the base plate 1. The slide projector 78 has a head piece 84 on its upper surface, inside which a projection lens is provided, and on one of its edges a reflecting mirror 17. This reflecting mirror 17 is also made rotatable. Headpiece 84 is preferably rotatably mounted. This allows the border to be rotated to point in different directions. A slit 85 is provided on the longitudinal side of the slide projector 78 into which a slide to be projected is inserted.

Next, the embodiment shown in FIGS. 29 to 31 will be described.

Referring to FIG. 29, the table plate 86 of the conference table is placed on two legs 87. A support section 88 is provided on the surface of the desk plate 86, and can be covered by the support section 881d and a rotatable lid. The surface of this lid is in the same plane as the surface of desk plate 860 in the closed state. A column of an overhead projector is inserted into each of the supports 88. desk plate 8
6 is provided with a cavity next to each of the supports 88, and within these cavities a plate 9 containing a Fresnel lens 89 is provided.
0 is stored.

The surfaces of these plates 90 consist of the smooth surfaces of Fresnel lenses 89 or auxiliary writing plates. The back surface of the plate 90 is provided with (63) movable mirrors 17 and 93, preferably made of the same material as the surface of these rotary mirrors. By inserting the column 2 having 4, it is possible to project the actual object directly from the surface of the desk in a reflective manner.In the case of direct projection, the plate 9° is the writing plate surface or the Fresnel lens 89. The column 2 is housed in the space so that the surface of the column 2 is located within the plane of the desk plate.
After removing the plate 90 from the plate 8, the plate 90 may be turned over 1d. In this way, the uniform appearance of the skin surface can be maintained.

The support part 88 may have a connection contact therein which is connected to the system power supply.

A plug-shaped contact 91 provided at the lower end of the column is inserted into these contacts. The inner wall of support 88 is shaped to snugly accommodate and secure the lower end of the column.

Column 2 has two projection lenses 4 and 94. And for each of these,

[Brief explanation of the drawing]

projected on. These projection lenses 4 and 94 are juxtaposed closely to each other so that they both receive the same image, ie the image obtained from the object placed on the plate 90. This image is projected onto two mutually opposing walls. A light source 6 is further installed inside the column. This light source 6 has two optical devices. Of these, one optical device is directed onto the plate 90 and the other optical device 92 is directed toward the plane next to the plate 9° and used as a working place and is used for illuminating said surface. Ru. Figures 29 and 30 show a rectangular conference desk. In the figure, A indicates the chairperson's work location, and B to G indicate the work locations of other attendees. In addition, a switch board 95 is installed at the chairperson's work place. The image from the overhead projector is
It is projected onto walls 96 and 97 on both sides of the conference desk. FIG. 2 is a side view of the lighting plate of the projector with the column removed; FIG. 3 is a vertical sectional view of the column; FIG. 4 is the overhead projector shown in FIGS. 1 to 3. FIG. 5 is a side view of an embodiment of an overhead projector of the type that has a lighting plate that also serves as a trunk for transportation. FIG. A plan view of the projector disassembled and packed, Figure 7 is a diagram showing the closed state, and Figure 8 is a plug-in type overhead projector in which the input step is inserted into a part of the column. Exploded side view, No. 9
The figure is a side view of the overhead projector shown in FIG. 8 in an assembled state, FIG. 10 is a front view of an overhead projector of the type in which an input step is inserted into the column from the outside, and FIG. 11 is a side view of the same. FIG. 12 is an enlarged view of the input step to be inserted, FIG. 13 is a side view of a type of projector with a plug-in lamp, FIG. 14 is a plan view of the frame holding the lamp, and FIG. 15 is a ,
FIG. 16 is a longitudinal sectional view of the frame, FIG. 16 is a longitudinal sectional view of an embodiment of the frame equipped with a contact surface and a reflector on the stem side, FIG. 17 is a perspective view of the frame in the guide rail, and FIG. 18 is a longitudinal sectional view of the frame. , FIG. 19 is a plan view of an embodiment in which two lamps and two reflecting mirrors are arranged in one frame, and FIG. 20 is a plan view of an embodiment in which two lamps and two reflecting mirrors are arranged in one frame. Fig. 19 is a longitudinal sectional view of an embodiment, Fig. 21 1 is a longitudinal sectional view of an embodiment in which two lamps are arranged in one frame, and Fig. 22 is a longitudinal sectional view of an embodiment equipped with a microfilm projector head. 1,323 is a side view of a still image projector with an overhead projection head FIG. 24 is a side view of a still image projector with both a microfilm projector head and an overhead projection head , second
Figure 5 is a side view of a still image projector equipped with a slide projector head, and Figure 26 is a side view of a still image projector equipped with both a slide projector head and an overhead projection head.
Figure 27 is a front view of an overhead projector with a slide projector head inserted into the side of the column; Figure 28 is a side view of the overhead projector shown in Figure 27; Figure 29 is a side view of the still image projector; Figure 30 is a side view of a conference table, Figure 30 is a plan view of a conference table equipped with one overhead projector in each work area, and Figure 31 is a column with a light source and two projection lenses. FIG. 2 is a partially cross-sectional side view of FIG. 1... Base plate 2... Column 3... Projection lens holder 4.94... Projection lens 5... Plug-in coupling device 6. ... Lamp 7, 8 ... Power supply section 10
, 15... Intake port 13... Ventilation device 14
...Exhaust port 17.93...Rotating mirror 3
0...Input step 31...Plug 34
...Opening 35...Casing 38
... Lamp 39 ... Fuse 40 ... Resistor 46 ... Frame 47 ... Knob section 48 ... Socket 49 ...
...Contact 50...Reflector 53...Guide rail 60...Quick coupling 61...Micro film projector 70...Overhead projection heads 74, 78...Slide projector 79...・Contact bin 86... Desk plate 89... Fresnel lens applicant Temornox G.M.P.A. Attorney Patent attorney Oka 1) Hidehiko Roe, Mon Roro FIG, 2 to 51 FIG, 25 Spontaneous hand-made kasuri Amendment (Method) 1935, Son Xu, R. No. 16c2 Tafdo No. Juntai patent related to BdM person

Claims (1)

[Claims] An overhead projector that supports a casing that accommodates a light source and holds a projection lens, wherein the column 2 accommodates a power supply section 7.8 therein. . (2) The overhead projector according to claim 1, wherein the system connection conductor 9 comes out from a lower region of the column 2. At least some of the columns are small. 2. Overhead projector according to claim 1, characterized in that the cold air conduit is formed by at least one inlet 10.15 and one outlet 14. (4) The overhead projector according to claim 1, wherein the column is coupled to the base by a plug-in coupling device 5. (5) The overhead projector according to any one of claims 1 to 3, wherein the base is a plate 1 having a plated Fresnel range and functioning as a writing plate. (6) The overhead according to claim 1, wherein the base is provided with an auxiliary fixing device using a magnet to fix the column 2 during transportation. type projector. (7) Column 2 consists of two consecutive columns at obtuse angles to each other.
Of these two parts, the lower part houses the power supplies 7 and 8, and the upper part houses the lamp 6.
2. An overhead projector according to claim 1, wherein a free end of said upper portion holds a projection lens holder (3). (8) Column 2 consists of 3 consecutive columns forming an obtuse angle to each other.
Two parts 2 A', 2'B +' 2. Consists of C,
Of these three parts, the lower part houses the power supplies 7 and 8, the middle part houses the ventilation device 13, and the upper part, which holds the projection lens holder 3 at its free end, accommodates the lamp 6. An overhead projector according to claim 1. (9) The exhaust port 14 is provided on the outer surface of the middle portion 2B of the column.
The overhead projector described in section. (l* The substantially vertical portion 2A of column 2 is 2
An overhead projector according to claim 1, comprising two mutually slidable parts, and comprising a device for adjusting the length of the column. t] 1) At least human power step 3° of the power supply equipment,
Over-throttle projector according to claim 1, characterized in that it is replaceably made into a plug-in component with a plug 31 and inserted into the socket of the other part of the power appliance. . 02. The overhead projector according to claim 11, wherein the input step 3o of the power supply device is installed in a separate casing 35, and the casing 35 has a cylindrical or rectangular parallelepiped shape. . θ] Column 2 is the casing 35 of the input step 3o
2. The overhead projector according to claim 1, wherein the casing 35 has an opening 34 into which the casing 35 is inserted. 04) The overhead projector according to claim 11, wherein the end of the casing of the input step 30 on the side opposite to the plug 31 is formed into a recessed portion. 00 Inside the casing 35 of the input step 30,
At least one resistor 40 and one heater are provided, and optionally one lamp 38 is provided, while the end of the casing 35 opposite the plug 31 is transparent. An overhead projector according to claim 1, characterized in that: OQ The column 2 supporting the projection head 3 is divided, each part 2A, 2B is connected to each other by a plug-in connection, and the end face of one of these parts 2A, 2B is connected to a power source. 12. The overhead projector according to claim 1, wherein an input step 30 of the projector is inserted. 071 The part 2A of the column 2 which accommodates the input step 30 has a window through which the input step 30 or its casing can be seen. Overhead projector. 08) The lamp 6, together with its socket 48 and reflector 50, is installed in a frame 46, and this frame 46 is inserted into and removed from the guide rail 53 provided inside the casing of the projection head 3 through the opening 45 of the casing. In addition, the frame 46 is provided with pin-shaped or planar electrical contacts 49 made of a conductor, and these electrical contacts 49 are connected to counter contacts provided in the casing of the projection head 3 and to the socket 5.
6. The overhead projector according to claim 1, wherein the projector contacts within 6. Oe One of the crosspieces of frame 46 45 part 4
7 or provided with a tab on the crosspiece, and the crosspiece on the opposite side from the tab 47 is provided with a contact pin 49. overhead projector. 2. The overhead projector according to claim 1, wherein the guide rail 53 is a conductor and holds a counter contact that constitutes a counter contact. 121) The overhead projector according to claim 18, characterized in that a device 51 for adjusting the relative position of the lamp 6 and the reflecting mirror 50 is provided within the frame 46. (a) Two lamps 6 are provided in the frame 46, and two reflecting mirrors 50 are provided between these lamps. frame 46 and member 59;
19. The overhead projector according to claim 18, wherein is made integrally with two reflecting mirrors 50. (c) Two lamps 6 are placed inside the window 55 of the frame 46.
are arranged side by side, and one reflecting mirror 50 is placed on both sides of the frame 46.
Claim 1 characterized in that each surface is provided separately.
(7) Overhead type projector according to item 16. 19. The overhead projector according to claim 18, wherein the contact 41j is provided on the frame asymmetrically with respect to the geometrical axis 57 or intermediate plane of the frame. (c) The projection head 70 equipped with the projection lens 4 for overhead projection, which is attached or attachable to the column 2 by a plug-in connection or quick coupling 60, is replaceable with a microfilm projector 61 or a slide projector 74. An overhead projector according to claim 16, characterized in that: (a) A microfilm projector 6 is attached to a projection head 70 equipped with a projection lens 4 for overhead projection.
1 and/or the slide projector 74 can be additionally mounted by means of a bayonet connection or a quick coupling 60. ecta. (a) The light beams of the slide projector 74 and the microglo projector 61 are directed to the base plate 1 on the one hand;
27. Overhead projector according to claim 25, characterized in that, on the other hand, 1 can be directed toward a wall surface. 28. Overhead projector according to claim 27, characterized in that an H microfilm projector 61 and/or a partially plated prism body is provided for branching the light beam. The microfilm projector 61 and slide projector 74 are connected by a rotary coupling device.
Overhead type grommet according to claim 27, characterized in that the projection head 3 is attached to the projection head or the column 2. The projection head 3 is inserted into the column 2 and held by an electric contact pin. and a slide projector 78, the casing of which is supported on the base plate 1 or beyond the base plate 1, and the electrical contacts of this slide projector 78 are 2. The overhead projector according to claim 1, wherein the pin 79 is inserted into an opening in the column 2, and a contact terminal is provided behind the opening. 01) Overhead projector according to claim 30, characterized in that the base plate 1 extends beyond the writing plate as a bearing surface for the slide projector 78. 0 Pier Column 2 has an area above its lower end where the contact pin 79 of the slide projector 78 is connected. Claim 30, characterized in that it has a contact opening for a contact pin of the head 3.
The overhead projector described in section. 03. The overhead projector according to claim 30, wherein the distance between the contact openings of the reservoir of the slide projector 78 and the distance between the contact openings of the reservoir of the projection head 3 are different. ■ The lower end of column 2 is especially suitable for the desk plate 86 of the conference table.
2. The overhead projector according to claim 1, wherein the overhead projector is inserted into and unscrewed from at least one support section provided in the projector. (c) The overhead projector according to claim 34, characterized in that connection contacts are provided within the support portion and within the portion of the column 2 inserted therein. A Fresnel lens 89 is provided on the surface of the desk plate 86 adjacent to the support portion α1). The overhead type projector according to claim 34, characterized by this overhead type projector. (a) A space is provided on the surface of the desk plate 86 adjacent to the support portion, and a plated Fresnel lens 89 is housed in this space. Overhead projector as described. (c) The light source has two positions, namely Fresnel lens 8
35. The overhead projector according to claim 34, wherein the overhead projector is rotatable between a position facing toward 9 and a position facing toward a location adjacent to the Fresnel lens 89 on the desk top surface. . (b) Column 2 is oriented in opposite directions to each other.
one projection lens 4,94 and two rotating mirrors 17.9
35. The overhead projector according to claim 34, wherein the overhead type projector has the following characteristics: