JPH046022Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an overhead type projector. Specifically, it is a stage for file sheets and film jackets, which consists of a frame member that is movable in a horizontal plane, has positioning pins embedded in it, and has a non-transparent area formed according to the dimensions of the subject. This invention relates to an overhead type projector that can be attached and detached.

Overhead type projectors intermittent images of objects placed on the stage by moving the table frame and eventually the stage two-dimensionally in the horizontal direction above the diffuser plate and condenser lens via the crosshead. It is something that is projected.

The objects to be photographed here include those of various sizes, such as a regular 35 mm slide film, a specimen sample slide, an endoscope film, an X-ray photographic film, and other transparent specimens. and
35mm slide films, preparations, etc. are generally held aligned on a relatively rigid file sheet formed to dimensions approximately equal to the dimensions of the stage, and endoscopic films and other relatively small negative films are For example, an X-ray machine is inserted into a film jacket with an outer diameter equal to or smaller than the dimensions of the stage, that is, a pocket formed by gluing two thin plastic films into a desired shape. Large objects such as photographic film can be placed directly on the stage and images can be projected thereon.

In other words, the image contained within the area of the light flux from the condenser lens is projected every time, on the other hand,
For objects not included in that area, projection is performed without interruption by continuously moving the stage.

Therefore, when performing such projection, it is necessary to select a stage that can sufficiently prevent each subject from bending and can support the subject without interfering with the projected image, taking into consideration the characteristics and dimensions of each subject. be.

This idea is particularly designed by making a removable stage consisting of a frame member attached to a table frame, embedded with positioning pins, and formed with a non-transparent area according to the dimensions of the subject. To provide an overhead type projector which can always project an appropriate subject image by allowing a stage to be appropriately selected and used according to characteristics and dimensions.

This invention will be explained below based on illustrated examples.

In Figure 1, 1 is a box with its top open, 2 is a light source system housed in the box, 3 is a condenser lens fixed above the light source system, and 4 is a box with the protrusion of the condenser lens removed. A diffuser plate that closes the top surface, 5 a crosshead that can be moved horizontally above the diffuser plate, 6 an arm member fixed to one side of the case and protruding directly above the condenser lens, and 7 a crosshead of the condenser lens. a projection lens attached to the arm member directly above; 8 a reflector that directs the light beam from the projection lens toward the screen; 9 a diffuser plate;
A light shielding member that moves back and forth with the crosshead to prevent excess light from leaking from the diffuser plate is shown.

Here, the crosshead 5 is the opposite one of the box 1.
It engages with a rail 10 provided on a pair of sides, in the figure, a side perpendicular to the side on which the arm member 6 is provided, and can slide guided by those rails 10. This crosshead 5 is provided with a table frame 13 that engages with rails 12 of the crosshead 5 extending in a direction perpendicular to the sliding direction thereof and whose sliding movement is guided by these rails.

In the illustrated embodiment, the crosshead 5 and the table frame 13 are rectangular, but it goes without saying that these frames may have a polygonal shape other than the rectangular shape.

In this invention, a stage 14 in which a non-transparent area is formed as appropriate according to the characteristics and dimensions of each subject is detachably attached to the table frame 13.

As the stage 14, for example, as shown in FIG.
A hooking piece 14b that can be hooked to the protrusion 15 provided on the side of the table frame 13 is provided, and the frame member 1
A glass 14e having dimensions corresponding to the frame member 14d is fitted onto a file sheet stage 4a with positioning pins 14c implanted on the upper surface thereof, or onto a frame member 14d having a mouth shape as shown in FIG. 2b. , Furthermore, a hooking piece 14 similar to that in FIG.
It is possible to use a film jacket stage or the like provided with a film jacket.

These stages 14 engage one of the U-shaped notches 14f of the engaging pieces 14b with one of the protrusions 15, and then engage the other notches 14f.
is attached to the table 13 by engaging the other protrusion 15 under elastic deformation.

Of course, the stage 14 can be removed by performing the reverse operation.

In addition, when the protrusion 15 is spring-biased so that it can advance and retreat by pressing force, these stages 14
Attaching and detaching becomes easier.

3a and 3b show a file sheet 16 and a film jacket 17 used in the file sheet stage 14 and the film jacket stage 14 of FIGS. 2a and 2b, respectively.

The file sheet 16 is constructed by, for example, press-molding a relatively hard plastic sheet 16a, so it has sufficient rigidity, and a slide film or preparation 18 can be mounted in each recess of the file sheet 16. The file sheet can be placed on the file sheet stage 14 shown in FIG. 2a while it is being inserted and held. Since this stage 14 has a crosspiece 14g that passes through a portion of the file sheet 16 that is outside the film loading recess, it can sufficiently support the file sheet 16, but does not prevent the film image from being projected at all. The file sheet stage 14 further includes a positioning pin 14c that engages with at least two of the binding holes 16a provided on one side of the file sheet 16, so that the file sheet 16 can be placed on the file sheet stage 14. Placed accurately.

On the other hand, the film jacket 17, which is made by sealing two thin plastic sheets according to the dimensions of the inserted film to form a pocket, still has low rigidity even when the film is inserted therein, so it is shown in Fig. 2b. By placing it on the glass 14e of the film jacket stage 14 as shown, it is supported flatly.

Therefore, the film jacket 17 is effectively prevented from being bent, and clear transparent images without distortion can always be obtained.

The film jacket 17 can be used not only for ordinary 35 mm slide film but also for subjects of various sizes. For example, as shown in FIG. 17, the glass 14e of the film jacket stage 14 is provided with a non-transparent area, that is, the mask 14, according to the dimensions of the endoscopic film as the subject, as shown in FIG. 4b.
The frame member 14d is provided with a positioning pin 14i similar to that described with reference to FIG. 2a. Here, the mask 14h blocks light from the condenser lens 3 except for the portion of the film jacket 17 that corresponds to the endoscope film 19, so the binding hole 17a of the film jacket 17 is engaged with the positioning pin 14i. When projecting in this state, the extra bright parts on the screen are completely removed and only the film image is projected onto the screen, so that the observer does not feel any glare.

Note that this also applies to the stage shown in FIG. It is also possible to use a structure in which glasses on which a sexual region is formed are fitted together, or a structure in which a crosspiece 14g is arranged according to the characteristics and dimensions of the subject.

In addition, for film jackets and other subjects,
Stage 1 for film jacket shown in Figure 2b
If the deflection cannot be sufficiently removed by simply placing the object on the glass No. 4, it is also possible to place another glass over the subject to position the subject and remove the deflection at the same time.

The file sheet stage shown in Figure 5 is the second stage.
The stages shown in FIG. By being supported so as to be slidable in the lateral direction, the file sheet 16 on the other frame member 14a' can be replaced while an image in the file sheet placed on one frame member 14a is being projected.

This file sheet stage 14 can be folded and stored when not in use.
If this is not necessary, each frame member 14a, 14
b can also be constructed integrally.

In addition, in the example shown in FIG. 6, the table frame 13 is
Although the guide members 13a and 13b are directly protruding, the table frame is composed of a rectangular frame and a protrusion as shown in FIG. 1, and a frame as shown in FIG. Comprising a member, a hooking piece, and a notch,
Furthermore, a stage support means including a guide member as shown in FIG. 6 may be fitted, and the stage 14 shown in FIG. 5 may be slidably supported therein.

As described above, according to this invention, by making the stage, which has positioning pins embedded in the table frame of the overhead projector and has a non-transparent area formed according to the characteristics and dimensions of the subject, detachable, It is possible to select and use a file sheet stage and a film jacket stage suitable for each subject, so that the subject can always be sufficiently supported and a clear projected image can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the projector according to this invention with the stage removed, Fig. 2 is a perspective view illustrating each stage for a file sheet and a film jacket, and Fig. 3 is a perspective view of the file sheet and film jacket. FIG. 4 is a perspective view showing a modification of the film jacket and stage, FIG. 5 is a perspective view showing another modification of the file sheet stage, and FIG. 6 is a projector according to the invention. It is a perspective view showing a modification of . 1... Box, 2... Light source system, 3... Condenser lens, 4... Diffusion plate, 5... Crosshead,
6... Arm member, 7... Projection lens, 8... Reflector, 9... Light shielding member, 10, 12... Rail, 1
3... Table frame, 13a, 13b... Guide member, 14... Stage, 14a, 14a', 14d
...Frame member, 14b...Hanging piece, 14c, 14i
...Positioning pin, 14e...Glass, 14f...
...notch, 14g...piece, 14h...mask, 15
...Protrusion, 16...File sheet, 16a, 1
7a... Binding hole, 17... Film jacket, 1
8...Slide film (preparation), 19
...Endoscope film, 20...Hinge.

Claims (1)

[Scope of utility model registration request] A light source system disposed inside the box, a condenser lens provided above the light source system, a diffuser plate that closes the top surface of the case except for the protrusion of the condenser lens, and above the diffuser plate, The table frame includes a table frame that can be moved two-dimensionally in the horizontal direction via a crosshead, an arm member that is fixed to a case and projects directly above the condenser lens, and a projection lens and a reflector that are attached to the arm member. In the new overhead type projector, the crosshead is directly engaged with the case and is slidable along the side of the case, and the crosshead is slidable in a direction perpendicular to the sliding direction. A table frame to be obtained is engaged, and a stage consisting of a frame member in which positioning pins are implanted and a non-transparent area according to the dimensions of the subject is formed is detachably attached to the table frame. Overhead type projector.