JPH0463383B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) This invention is applied to an overhead projector as an upper stage, and a long strip film is directly inserted between a transparent lower plate and a transparent upper plate. To,
Or it relates to a glass stage for long strip films that is held indirectly via a film jacket, and in particular, all long strip films whose length is larger than the horizontal dimension of the projector body. image can be smoothly projected onto a screen without changing the relative position of the film with respect to the glass stage.

(Prior Art) As a conventionally known glass stage applied as an upper stage to an overhead projector, there is one shown in FIG. 6, for example.

A light source system (not shown) is housed inside a box 2 whose upper end opening is closed with a translucent plate 1, and the upper end of a condenser lens 3 is passed through the translucent plate 1 and protrudes upward. A lower stage 5 consisting of a rectangular frame-shaped body having a dimension in the front and rear directions that is somewhat smaller than the dimension of the translucent plate 1 is provided on the left and right ends of the projector body 4. 6, the projector body 4
The upper part of the projector body 4 is slidably supported in the front-rear direction, and is supported on one front side of the lower stage 5 so as to be slidable in the extending direction thereof, and is capable of reciprocating in the left-right direction of the projector main body 4. A stage mounting member 7 is provided, and an upper stage guide member 8 is provided on one side of the rear side of the lower stage 5, and further,
This glass stage is applied to an overhead projector in which the upper stage mounting member 7 is provided with a pair of upper stage engaging pins 9 that protrude upward from the upper stage mounting member 7. Rectangular frame 11 having the same outer shape
A transparent lower plate 12 made of glass, plastic, etc. is fixed to the center of the rectangular frame plate 11, and a transparent upper plate 13 for pressing the strip film onto the transparent lower plate 12 is attached to the rear side of the rectangular frame plate 11. The rectangular frame body 11 is hinged so as to be openable and closable, and is further constructed by providing two small holes 14 in the front side portion of the rectangular frame body 11, which fit exactly into the pair of upper stage engaging pins 9 mentioned above. There is.

In this glass stage, reference numeral 15 indicates a lock lever which is rotated onto the transparent top plate to prevent it from being accidentally opened.

In addition, in the illustrated overhead projector, reference numeral 16 indicates a support arm extending from one corner of the projector main body 4 onto the semi-transparent plate, and reference numeral 17 indicates a support arm extending directly above the condenser lens 3. 16 is a reflecting mirror attached to the tip, 18 is a projection lens system also attached to the tip of the support arm 16, and 19 is a mirror attached to the rear side of the lower stage 5 on a semi-transparent plate. A light-shielding film stretched between the one part and the projector main body 4 is shown.

In such a glass stage, two small holes 14 provided on the front side are connected to the upper stage mounting member 7.
Each upper stage engaging pin 9 protrudes from the
At the same time, by engaging the rear end portion of the glass stage with the upper stage guide member 8 on the rear side of the lower stage, the glass stage can be placed under the action of the lower stage 5 and the upper stage mounting member 7. By making it possible to reciprocate back and forth and left and right with respect to the projector body 4, this glass stage can be used to hold 35mm strip slide film, endoscopic film, and dental film. For example, when holding a film such as 35mm strip slide film inserted into a film jacket between the upper and lower transparent plates, either alone or while it is inserted into a film jacket. As shown in FIG. 7, the transparent upper plate 13 is opened with the glass stage fully extended forward with respect to the projector main body 4, and then the 35 mm strip slide film is inserted. The film jacket 20 with the inserted
Insert it between the upper and lower transparent plates to a predetermined position, and then completely close the transparent upper plate 13,
A lock lever 15 is engaged with the transparent upper plate 13.

To project a desired image of the film held between the glass stages in this way, the images are moved along with the glass stage relative to the projector main body 4 in the front and back and left and right directions, and the condenser lens 3 This is done by positioning it directly above the .

(Problem to be solved by the invention) However, such a conventional glass stage
The main purpose of this structure is to project an image of a strip slide film of 275 mm x 230 mm.
mm, so a long strip film with a length exceeding 275 mm, for example, a width of 16 mm and a length of
When projecting images such as 300 to 400 mm endoscopic film and micro film, 60 mm wide and 400 mm long Brownie film, and panoramic film from end to end using the glass stage, use a long strip. The relative position of the film to the glass stage is changed at least once during projection so that the part of the long strip film protruding from the glass stage is properly held between the glass stages. However, there was a problem in that the image projection operation became extremely troublesome. This invention advantageously solves the problem of the prior art, and even when using a long strip film with a length exceeding 275 mm, the image can be changed completely by changing the relative position of the film with respect to the glass stage. To provide a glass stage for a long strip film on which projection can be easily performed from end to end without having to do so.

(Means for Solving the Problems) The glass stage for long strip films of the present invention, which is applied as an upper stage to an overhead projector, has a rectangular frame to which a transparent lower plate is fixed. Furthermore, if the horizontal dimension of the inside of the frame is made larger than the horizontal dimension of the projector body, a long strip film can be placed on the transparent lower plate without protruding from there. In addition, the transparent upper plate that presses the long strip film onto the transparent lower plate is hinged to the rectangular frame so that it can be opened and closed, and the transparent upper plate is attached to the front side of the rectangular frame in the left and right direction. Extending,
Elongated holes are provided that fit into the upper stage fitting pins protruding from the upper stage mounting member, and the length of each of these elongated holes can be determined more accurately by the amount of protrusion of the rectangular frame from the projector body. The length of the inner edge of the frame is determined according to the amount of protrusion from the inner edge of the lower stage.

(Function) In this long strip film glass stage, by fitting the elongated hole to the upper stage fitting pin, more preferably, in addition to this, the rear side portion of the glass stage can be By engaging the upper stage guide member provided on the lower stage, the long strip film glass stage can be moved forward and backward with respect to the projector body under the action of the lower stage and upper stage mounting members. In addition to being able to reciprocate in the left-right direction, even when the upper stage mounting member reaches its movement limit position with respect to the lower stage, the long strip film glass stage can still be moved by the action of the long holes provided therein. The glass stage can be moved relative to the upper stage fitting pin and, by extension, to the upper stage mounting member in at least one direction, leftward or rightward, by an amount corresponding to the amount of protrusion of the glass stage from the projector body. Therefore, not only can a long strip film be sufficiently sandwiched over its entire length between the upper and lower transparent plates, but also all images on the long strip film can be transferred to the glass stage of the film. without changing the relative position of
It can be placed directly above the condenser lens, or in other words, it can be projected.

Therefore, according to this glass stage for a long strip film, the entire image of the long strip film can be captured not only by the effects of the lower stage and upper stage mounting members but also by the effects of the long holes of the glass stage. That is, by sliding it relative to the upper stage mounting member, projection can be performed simply and easily.

(Example) Examples of the present invention will be described below based on the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of the present invention together with an overhead projector.
Here, parts of the overhead projector that are similar to those described in the conventional example are designated by the same numbers.

That is, in the figure, 1 is a translucent plate, 2 is a box whose upper end opening is closed by the translucent plate and contains a light source (not shown), and 3 is a condenser whose upper end protrudes above the translucent plate. Each lens is shown,
Further, 4 indicates a projector main body made up of each of these.

Reference numeral 5 designates a lower stage having an approximately rectangular frame shape as a whole, and this lower stage 5 has an inner dimension that is approximately equal to the horizontal dimension of the translucent plate 1 and somewhat smaller than its longitudinal dimension.

Reference numeral 6 indicates guide rails that are provided at both left and right ends of the projector main body 4 and engage with the lower stage 5; The reciprocating movement of the lower stage 5 is guided.

Reference numeral 7 designates an upper stage mounting member having a generally channel-like bar shape as a whole. Performs reciprocating motion in the left and right direction. Here, this fitting of the upper stage mounting member 7 to the engaging portion 5a is as follows.
As shown in the sectional view in FIG. 2, this is done by engaging the upper stage mounting member 7 with each of the rollers 21 and guide rails 22 provided on the engaging portion 5a.

Reference numeral 8 in FIG. 1 indicates an upper stage guide member with a substantially hook-shaped side surface provided on one side of the rear side of the lower stage 5, although this is not an essential requirement for the projector. The member 8 contacts the rear end surface and rear upper surface of a glass stage for a long strip film, which will be described later, and moves the glass stage to the lower stage 5 in the left and right direction of the upper stage mounting member 7.
It also functions to ensure smooth sliding movement.

Further, reference numeral 9 in the figure indicates a pair of upper stage engaging pins that protrude upward from the upper stage mounting member 7.

Here, in the glass stage for a long strip film of this example, by making the horizontal dimension of the rectangular frame body 23 larger than that of the projector main body 4, the inner dimension of the rectangular frame body 23 is The rectangular frame body 23 has a transparent lower plate 24 made of glass or plastic in the center thereof.
is fixed in a state where the central opening of the frame 23 is completely closed, and a transparent upper plate 25 for pressing the long strip film onto the transparent lower plate is attached to the rectangular frame 23 and is attached upwardly from there. The transparent upper plate 25 is hinged to be openable and closable via a bracket 26 provided protruding from the transparent lower plate 24.
On the other hand, a knob 27 fixed to the front end portion of the
Hold it so that it can be opened freely from the front side to the rear side.

Further, in this glass stage, a pair of upper stage fitting pins 9 are fitted to the front side portion of the rectangular frame body 23, extending in the left and right direction, and projecting upward from the upper stage mounting member 7. Each long hole 28 that fits together is provided, and each of these long holes 2
The length l of 8 is determined by the amount of protrusion of the rectangular frame body 23 from the projector main body 4, or more precisely, the length of the rectangular frame body 23 according to the amount of protrusion of the inner edge of the rectangular frame body from the inner edge of the lower stage. do.

Therefore, in this long strip film glass stage, when the upper stage mounting member 7 is engaged with the engaging portion 5a of the lower stage 5, each of the upper stages protruding from the upper stage mounting member 7 The glass stage can be attached to an overhead projector by fitting the fitting pins 9 into the respective elongated holes 28 provided in the glass stage, and by engaging the rear side portion of the glass stage with the upper stage guide member 8. Under the action of the lower stage 5, the glass stage in such an installed state can be attached to the projector main body 4.
can reciprocate in the front-rear direction with the upper stage mounting member 7 to the respective stroke ends of the lower stage 5, and under the action of the upper stage mounting member 7, up to its stroke end with respect to the lower stage 5. The lower stage 5 and the projector main body 4 can reciprocate in the left-right direction, and furthermore, under the action of the elongated hole 28 provided in the glass stage, the upper stage fitting pin 9 and, by extension, the upper stage mounting member 7 can be moved. On the other hand, the projector main body 4 can be relatively displaced by the length l of the elongated hole 28 in at least one direction of the left and right directions.

Therefore, in this long strip film glass stage, when the long strip film is held between the upper and lower transparent plates without protruding from them, each of the glass stages as described above is Based on the movement of the film, it is possible to simply and easily bring all images of the film to a position directly above the condenser lens 3 without changing the relative position of the long strip film with respect to the glass stage. Become.

In addition, in the glass stage for long strip films shown in this example, transparent upper plates 2 are attached to brackets 26 provided at both left and right ends of the rectangular frame 23.
When the transparent upper plate 25 is hinged by engaging the respective pins 29 provided protruding to the left and right sides of the bracket 26, the respective pins 29 extend horizontally in the front-rear direction and the rear end portion is By providing elongated holes 30 facing downward and fitting pins 29 into these elongated holes 30, the transparent upper plate 25 can be opened and closed at any position of the elongated holes 30. Therefore, by dropping the pin 29 into the downwardly inclined portion 30a at the rear end of the elongated hole 30, the upper and lower transparent plates are brought into close contact with each other through the long strip film to be projected. In addition, by pulling out the transparent upper plate 25 to a desired position in the horizontal portion of the elongated hole 30 as shown in the figure, and then opening the transparent upper plate 25,
Interference between the transparent upper plate 25 and the reflecting mirror 17 during the opening operation can be sufficiently prevented.

In addition, when pulling out the transparent upper plate 25 in this manner, the pin 29 is inserted into the downwardly inclined portion 30a.
will be moved upward, and the transparent upper plate 2
5 is quickly displaced upward with respect to the long slide film on the transparent lower plate, so that the long slide film receives an external force in the shearing direction from the transparent upper plate 25,
In other words, there is no risk of receiving any frictional force.

Further, in this example, the front side portion of the transparent upper plate 25 that is pulled forward is prevented from coming into contact with the transparent lower plate 24, and the front side edge thereof is also prevented from coming into contact with the upper stage mounting member 7. In order to prevent this, support brackets 31 are provided on the front sides of the rectangular frame body 23 to support the transparent top plate 25 at a predetermined height at a distance in the left-right direction. It also functions as a drawer guide means for 25.

FIG. 3 is a perspective view showing how the glass stage for a long strip film as described above is applied to an overhead projector equipped with a screen. Showing screws.

In addition, 33 in the figure is attached to the rear edge of the projector main body 4.
A removably attached lid 34 is this lid 33
The projection screen attached to the is shown in each figure.

Here, the projection screen 34 is attached to the lid 33 by attaching the lower end of the support rod 35, one end of which is pivoted to the upper corner of the lid 33, when the lid 33 is in the open state as shown in the figure. Long hole 3 in length direction
5a, the lower end of the support rod 37 is engaged with a pin 36 projecting laterally of the screen 34, and is pivotally supported on the upper end of the projection screen 34.
This is done by fitting into a guide groove 38 provided at the lower end of the lid 33, and pivotally supporting both support rods 35, 37 with a pin 39 at an intermediate position between them.

The projection screen 34 attached to the lid 33 in this way moves the pin 36 above the elongated hole 35a, and also moves the lower end of the support rod 37.
By sliding down the guide groove 38, it can be displaced from the set position as shown to a retracted position in which it is very close to the top wall of the lid 33.

Further, 40 indicates a reflecting mirror that is disposed inside the lid 33 and reflects the image from the projection lens system 18 onto the projection screen 34, and 41 indicates a reflecting mirror that is attached to the projection screen 34 and has a side surface shape. A triangular light-shielding film is shown. Here, the light-shielding film 41 is configured such that the swinging arm 42 pivoted to the lower end of the projection screen 34 is connected to the lower side of the light-shielding film 41, and the tip of the swinging arm 42 is moved downward. By swinging, it can be expanded as shown in the figure, and conversely, by swinging the tip of the singing arm 42 upward, it can be folded.

The application of a glass stage for long strip films to such an overhead projector is as follows:
As mentioned above, this is done by fitting the elongated hole 28 provided in the front side portion of the glass stage to the upper stage fitting pin 9 and engaging the rear side portion with the upper stage guide portion 8. When projecting a film image using the glass stage applied in this manner, it is preferable to move the long strip film glass stage sufficiently forward by the action of the lower stage 5. Under the pulled out condition,
As shown in FIG. The transparent upper plate 25 is opened in the direction shown by arrow A in FIG. , the length direction of the transparent lower plate 24
The transparent lower plate preferably has a sufficiently large left-right dimension so that the end portion thereof does not protrude from the transparent lower plate 24 when the film is used alone or inserted into the film jacket in the left-right direction. Place it in the center of 24, and then
The transparent upper plate 25 is brought into a closed state with its front portion supported by the support bracket 31, and then,
By pushing the transparent upper plate 25 backward into the transparent lower plate 24, the pin 29 provided there
is dropped into the downwardly inclined portion 30a of the elongated hole 30, so that the elongated strip film is held between the transparent upper plate 25 and the transparent lower plate 24.

After that, the relative movement of the lower stage 5 with respect to the projector main body 4 and the lower stage 5
Based on the relative movement of the upper stage mounting member 7 to By placing it directly above the long condenser lens 3, the film image is projected onto the projection screen 34 from the back side of the projection screen 34 via the reflecting mirror 17, the projection lens system 18, and the reflecting mirror 40.

Note that even when the lower stage 5 and upper stage mounting member 7 are moved to their respective stroke ends, the long strip film glass stage is smaller than the horizontal dimension of the projector body. Due to the large lateral dimensions, it is impossible to bring the film image located at at least one end of the long strip film directly above the condenser lens 3; When projecting an image, the glass stage is displaced relative to the upper stage fitting pin 9 and the upper stage mounting member 7 in at least one direction in the left-right direction by the action of the long hole 28 provided therein. With this, a desired image of the end portion of the film is brought to a position directly above the condenser lens 3 without changing the relative position of the long strip film with respect to the glass stage.

Therefore, in the case of this glass stage for long strip films, no matter how large its horizontal dimension is, or in other words, no matter how long the long strip film is, By displacing the glass stage relative to the upper stage mounting member 7 based on the action of the long hole 28 of an appropriate length provided therein,
All images of a long strip film can be projected very easily and simply from one end to the other with sufficient accuracy.

FIG. 4 is a perspective view showing another embodiment of the present invention, and in this example, the dimensions in the left and right direction are
In the rectangular frame 28, which is larger than the one shown in FIG. The brat 26 which has been formed is shifted to the left side in the figure and fixed
A downwardly inclined portion 30a is provided at the left end portion of each elongated hole 30 in the figure.

According to this example, based on the effect of the elongated holes 28 provided in the front side portion of the glass stage, it is possible to bring about the same effects as those of the above-mentioned embodiment, and each of the holes protruding from the transparent upper plate 25 can pin 2
By engaging the transparent upper plate 25 with the elongated hole 30, the transparent upper plate 25 can be pulled out to the right in the figure without fear of interference with the upper stage mounting member 7. 7,
In relation to the relative position to the projector body 4,
The elongated hole 30 can be opened and closed at an appropriate position without being obstructed by the reflecting mirror 17.

Note that 43 and 44 in the figure are attached to the knob 27 and the rectangular frame 23, respectively, and the transparent upper plate 25
The hook-and-loop fastener members that maintain close contact with the transparent lower plate 24 are shown.

FIG. 5 is a perspective view showing still another embodiment of the present invention, in which one transparent upper plate 25 is divided into two parts, a right half 25a and a left half 25b.
Pins 29a and 29b provided at the left end of the right half 25a and the right end of the left half 25b, respectively.
are fitted into the long holes 45 and 46 formed in the front and rear brackets 26a, respectively, to move the right half 25a to the right in the figure and the left half 25b.
can be pulled out to the left of the figure.

Here, by providing downwardly inclined portions 45a and 46a at the proximal end portions of the respective elongated holes 45 and 46, the respective half portions 25a and 46a are provided.
25b can be brought into close contact with the transparent lower plate 24 when reaching their pushing end position.

The glass stage for a long strip film of this embodiment can also provide the same effects as the embodiment shown in FIG. 4 when used.

(Effects of the Invention) Thus, according to the present invention, by making the rectangular frame body, and by extension its inner side dimension in the horizontal direction larger than that of the projector main body, various long strip films can be inserted from the transparent lower plate. A length that can be held without protruding, is formed on the front side of the rectangular frame, and has a length corresponding to the horizontal dimension of the rectangular frame relative to the horizontal dimension of the projector main body. By displacing the glass stage relative to the upper stage mounting member in at least one direction of the left and right directions based on the action of the holes, all images of the long strip film can be changed relative to the glass stage. Projection can be performed extremely easily and simply without changing the position at all.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing an embodiment of the present invention together with an overhead projector, Fig. 2 is a sectional view showing the mounting structure of the upper stage mounting portion to the lower stage, and Fig. 3 is a glass FIGS. 4 and 5 are perspective views showing other embodiments of the present invention, and FIGS. 6 and 7 are perspective views showing a conventional example. It is. 1...Semi-transparent plate, 2...Box body, 3...Condenser lens, 4...Projector main body, 5...Lower stage, 6...Guide rail, 7...Upper stage mounting member, 8...Upper part Stage guide member, 9...
...Upper stage engaging pin, 23...Rectangular frame, 2
4... Transparent lower plate, 25... Transparent upper plate, 25a...
Right half, 25b...Left half, 26, 26a...
...Bracket, 27...Knob, 28, 30, 4
5, 46... Long hole, 29, 29a, 29b... Pin.

Claims (1)

[Claims] 1. A projector main body that has a built-in light source system and is generally box-shaped as a whole; a frame-shaped lower stage that is supported by the projector main body and reciprocates in the front and rear directions; An upper stage mounting member supported by one side of the lower stage and capable of reciprocating in the left-right direction of the projector body, and a pair of upper stage fittings provided to protrude upward from the upper stage mounting member. In a glass stage applied as an upper stage to an overhead projector equipped with dowel pins, a transparent lower plate is fixed to a rectangular frame having a horizontal dimension larger than the horizontal dimension of the projector body, and the transparent lower plate A transparent upper plate for pressing a long strip film is hinged to the rectangular frame so as to be freely openable and closable, and extends in the left-right direction of the rectangular frame at the front side portion of the rectangular frame, Elongated holes are provided that fit into the upper stage fitting pins, and these elongated holes have a length corresponding to the amount of protrusion of the rectangular frame from the projector main body. glass stage.