JPH0463384B2 - - 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 strip film is directly inserted between a transparent lower plate and a transparent upper plate. The present invention relates to a glass stage for a strip film that is held indirectly through a film jacket or a film jacket.
When mounted on an overhead projector, the transparent top plate can be freely opened without causing interference with the reflecting mirror and projection lens system attached to the support arm of the projector.

(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 pivoted 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 into the two integral upper stage engaging pins 9 mentioned above. ing.

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, in such a conventional glass stage, the transparent upper plate 13 is pivotally supported on the rectangular frame 11 at a predetermined position, and the transparent upper plate 13 cannot perform any relative movement other than opening/closing movement with respect to the rectangular frame 11. Therefore, with the glass stage attached to an overhead projector, the strip film is inserted between the upper and lower transparent plates. When the transparent upper plate 13 is inserted into and taken out from the transparent lower plate 12, it is necessary to open the transparent upper plate 13 widely with respect to the transparent lower plate 12. Above the glass stage, a reflecting mirror 17 and a projection lens system 18 are installed. Because of this, even if the lower stage 5 is moved forward with respect to the projector main body 4 to the stroke end, as shown in FIG. 7, for example, the reflector 17 and the projection lens system This obstructs the large opening of the transparent upper plate 13,
Therefore, the strip film is attached to the transparent lower plate 12.
There has been a problem in that it is extremely difficult to place the device properly in a predetermined position.

The present invention advantageously solves such problems of the prior art, and allows for a sufficiently large opening of the transparent top plate and thus of the strip film, despite the presence of a reflector and a projection lens system. To provide a glass stage for a strip film that enables proper placement.

(Means for Solving the Problems) The strip film glass stage of the present invention, which is applied as an upper stage to an overhead projector, has a rectangular frame having approximately the same dimensions as the lower stage, and a center opening. A transparent lower plate that completely closes the cover is fixed, and a transparent upper plate that presses the strip film onto the transparent lower plate is attached to a hinge pin that protrudes laterally from one end of the transparent lower plate in the front-rear direction or left-right direction. Therefore, the transparent upper plate is pivoted to a bracket provided on the rectangular frame, and the bracket is provided with a long hole that engages with the hinge pin and guides the movement of the transparent upper plate in the drawing direction.
A downwardly sloping portion is provided at the end of the elongated hole on the push-in side of the transparent upper plate, and a small hole is provided at one side of the rectangular frame to fit the upper stage fitting pin. It is something that

(Function) In this glass stage for strip film, the small hole is fitted into the upper stage fitting pin, and more preferably, in addition to this, the rear side portion of the glass stage is provided in the lower stage. By engaging the upper stage guide member and attaching the glass stage to the overhead projector, the strip film glass stage can be attached to the lower stage and the upper stage mounting member respectively. The glass stage can be reciprocated as required in the front, back, left and right directions relative to the projector body.
The opening of the transparent top plate in such an attached state is preferably performed by sufficiently moving the entire glass stage toward the front or to the left or right of the projector main body in relation to the opening direction of the transparent top plate. , then
The transparent top plate is pulled out in the extending direction of the long hole by the action of the long hole that is engaged with the hinge pin provided therein, so that the transparent top plate completely covers the lower part of the projector's reflector and projection lens system. After passing, this is done by opening the transparent top plate, and as a result, the transparent top plate can be opened as wide as required without being hindered by them.

Therefore, it is now possible to place the strip film at the desired position on the transparent top plate very easily and accurately.

Note that if the elongated hole provided in the bracket is long enough, pull out the transparent top plate while keeping the glass stage positioned at approximately the center of the translucent plate, and then operate the opening operation. Again, the translucent plate can be left wide open, provided that the rear edge of the translucent plate passes completely below the reflector and projection lens. .

After the strip film is properly placed on the transparent lower plate with the transparent upper plate in this open state, with the transparent upper plate in the closed position, push it into the long hole and insert it into the long hole. The strip film is held between the upper and lower transparent plates by dropping the hinge pin protruding from the transparent upper plate into the downwardly inclined portion provided at the push-in end.

When holding the strip film in this way, there is sufficient clearance between the transparent upper plate and the transparent lower surface until the hinge pin enters the downwardly sloping part of the elongated hole. There is no possibility that the strip film will receive any force in the shearing direction from the transparent top plate due to the displacement, in other words, a frictional force, and therefore, by pushing the transparent top plate as described above, the strip film The position of the strip film on the lower plate is changed,
The emulsion surface is not damaged.

The same thing applies when pulling out the transparent upper plate, and at the same time the hinge pin protruding from the transparent upper plate starts to pull out from the downwardly inclined part of the elongated hole, the transparent lower plate of the transparent upper plate is pulled out. Since the strip film begins to separate from the transparent lower plate, there is no possibility that the strip film on the transparent lower plate will receive any frictional force from the transparent upper plate.

Therefore, according to this glass stage for strip film, the hinge pin provided on the transparent upper plate can be
By making it possible to open and close the transparent top plate at a desired position within the elongated hole having a downwardly sloping part,
It can be opened sufficiently wide without being affected by the reflecting mirror or the projection lens.

(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 strip film, which will be described later, and smoothly moves the glass stage, along with the upper stage mounting member 7, with respect to the lower stage 5 in the left and right direction. It functions to cause 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 strip film of this example, the inner and outer dimensions of the rectangular frame 23 are made almost equal to those of the lower stage 5, and the center part of the rectangular frame 23 is made of glass or plastic. Transparent lower plate 24
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, round holes 28 are provided in the front side portion of the rectangular frame body 23 to fit two pairs of upper stage fitting pins 9 projecting upward from the upper stage mounting member 7. .

Therefore, in this glass stage for strip film, when the upper stage mounting member 7 is engaged with the engaging portion 5a of the lower stage 5, each upper stage fitting member protruding from the upper stage mounting member 7 By fitting the respective round holes 28 provided in the glass stage into the pins 9 and engaging the rear side portion of the glass stage with the upper stage guide member 8,
A glass stage that can be installed in an overhead projector,
Under the action of the lower stage 5, the projector main body 4 can reciprocate in the front-back direction together with the upper stage mounting member 7 to each stroke end of the lower stage 5, and under the action of the upper stage mounting member 7 , its lower stage 5
lower stage 5 until the end of the stroke for
And the projector main body 4 can be reciprocated in the left-right direction.

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

In addition, in the glass stage for strip film shown in this example, pins 29 are provided on the brackets 26 provided at both left and right ends of the rectangular frame body 23 so as to protrude to both the left and right sides of the transparent upper plate 25.
When the transparent upper plate 25 is pivotally supported by engaging the brackets 26 and 26, each bracket 26 is provided with an elongated hole 30 extending horizontally in the front-rear direction and whose rear end portion is directed slightly downward. By fitting the pin 29 into the hole 30, the transparent upper plate 25 can be opened and closed at any position in the elongated hole 30. For this reason, the pin 29 is inserted into the elongated hole 30 here.
By dropping it into the downwardly inclined portion 30a of the rear end portion, the upper and lower transparent plates can be brought into close contact with each other via the strip film to be projected.
In addition, the transparent upper plate 25 is inserted into the elongated hole 30 as shown in the figure.
By opening the transparent upper plate 25 and the reflecting mirror 17 during the opening operation, it is possible to sufficiently prevent interference between the transparent upper plate 25 and the reflecting mirror 17 during the opening operation.

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
Since the slide film 5 is quickly displaced upward with respect to the slide film on the transparent lower plate, there is no possibility that the long slide film will receive an external force in the shearing direction from the transparent upper plate 25, in other words, a 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 strip film as described above is applied to an overhead projector equipped with a screen. show.

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 is attached to the projection screen 34 and has a side surface shape. A triangular light-shielding film is shown. Here, this light shielding film 4
1, by swinging the tip of the swinging arm 42 downward while the swinging arm 42 pivotally supported at the lower end of the projection screen 34 is connected to the lower side of the light-shielding film 41. It can be expanded as shown in the figure, and conversely, it can be folded by swinging the tip of the singing arm 42 upward.

To apply a strip film glass stage to such an overhead projector, as described above, the round hole 28 provided on the front side of the glass stage is fitted into the upper stage fitting pin 9, and The rear side portion thereof is engaged with the upper stage guide portion 8, and when using the glass stage applied in this way to project a film image of the strip film, it is preferable to , with the strip film glass stage fully pulled out to the front by the action of the lower stage 5, the transparent upper plate 2 of the glass stage is
As shown in FIG.
1, the transparent upper plate 25 is opened in the direction indicated by arrow A in FIG. , preferably with the length direction facing the left and right direction of the transparent lower plate 24, and the end portion of the film not protruding from the transparent lower plate 24, either alone or inserted into a film jacket. , transparent lower plate 2
4, and then the transparent upper plate 25
is brought into a closed state with its front side supported by the support bracket 31, and then the transparent upper plate 25 is pushed rearward into the transparent lower plate 24, so that the pin 29 provided thereon is lengthened. The strip film is dropped into the downwardly inclined portion 30a of the hole 30, and the strip film is held between the transparent upper plate 25 and the transparent lower plate 24.

Note that when the transparent upper plate 25 is pulled out while holding the strip film, the upper and lower transparent plates 25 and 24 are separated from each other at the same time as the hinge pin 29 begins to move upward on the downwardly inclined portion 30a. , the strip film is not subjected to frictional force by the transparent upper plate 25, and this is almost the same when the transparent upper plate 25 is pushed into the transparent lower plate 24, and the hinge pin 29 Since there is a clearance between the upper and lower transparent plates until the strip film completely falls into the downwardly inclined portion 30a of the elongated hole 30, the position of the strip film on the transparent lower plate is changed by the transparent upper plate 25. There is no risk that the emulsion surface will be damaged.

Further, here, the transparent upper plate 25 can be opened sufficiently wide under the action of the elongated holes 30 without being affected by the reflecting mirror, so that the strip film can be placed at the desired position on the transparent lower plate 24. can be placed extremely easily and reliably.

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 positioning the film directly above the lens 3, the film image can be transferred to the reflecting mirror 1.
7. The image is projected onto the projection screen 34 from the back side via the projection lens system 18 and the reflecting mirror 40.

FIG. 4 is a perspective view showing another embodiment of the present invention. In this embodiment, a rectangular frame 23 having approximately the same dimensions as the lower stage 5 has a front side portion similar to that of the embodiment described above. A bracket 26 is provided with a round hole 28 and has elongated holes 30 formed in each of its front and rear sides, and is fixed to the left side in the figure. In the figure, there is a downwardly sloping part 3 on the left end.
0a is provided.

According to this example, by engaging the respective hinge pins 29 protruding from the transparent upper plate 25 into the long holes 30, the transparent upper plate 25 can be attached without fear of interference with the upper stage mounting member 7. It can be pulled out to the right in the figure, and the elongated hole 30
The transparent upper plate 25 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 25
a, 25b can be brought into close contact with the transparent lower plate 24 when they reach their pushing end positions,
At the same time as the drawer starts, it can be separated from the transparent lower plate.

(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 drawings]

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)

[Scope of Claims] 1. A projector main body, which has a top opening of a box housing a built-in light source system closed with a semi-transparent plate, and is provided with a condenser lens that penetrates the semi-transparent plate and projects upward; A lower stage and an upper stage mounting member supported by the projector body and capable of reciprocating in mutually orthogonal directions, and a pair of upper stage fitting pins provided to protrude upward from the upper stage mounting member. , a glass applied as an upper stage to an overhead projector comprising a support arm extending from a corner of the projector body to a position above a condenser lens, a reflector attached to the support arm, and a projection lens system. In the stage, a transparent lower plate is fixed to a rectangular frame having approximately the same dimensions as the lower stage, and a transparent upper plate that presses the strip film onto the transparent lower plate is attached to the rectangular frame by a hinge pin protruding from the transparent upper plate. It is pivoted to a bracket provided on the body, and the bracket has a
A long hole is provided that engages with the hinge pin and guides the movement of the transparent top plate in the pull-out direction, and a downwardly sloping portion of the long hole is provided at the end portion of the push-in side of the transparent top plate, and the rectangular frame body A glass stage for strip film, which is provided with a small hole on one of its sides that exactly fits into the upper stage fitting pin.