JPH0618348Y2 - Projection posture conversion mechanism of overhead type projector - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION This invention relates to a projection posture changing mechanism for an overhead type projector, and more particularly, to a simple and small size projection mechanism on a screen provided at a predetermined position regardless of the direction of the projected film image. The present invention relates to a projection posture conversion mechanism that makes it extremely easy and smooth to project an erect image of.

[0002]

2. Description of the Related Art For example, FIG. 3 shows a known film jacket that can be used for organizing and storing a long positive film and projecting it.
This film jacket 1 forms a plurality of film accommodating portions 2 aligned with each other by heat-sealing two plastic sheets at a predetermined position, and further, a predetermined side of the plastic sheet 3 after heat-sealing is formed. The film jacket 1 is formed by forming a binding hole 4 for rearranging and storing the film, and the long positive film 5 is stored in the film storage portion 2 of the film jacket 1 rather than the width and length of the film 5. This is done by inserting the film 5 from one end of each film storage portion 2 having a large width and length until it is completely stored in the storage portion.

By the way, since the long positive film 5 accommodated and held in the film jacket 1 is long, the orientation of the images in one film is not vertical or horizontal as shown in the drawing. Inevitable,
Therefore, the film 5 stored in the film jacket
When the film image is projected onto the screen 7 by the overhead type projector 6 as shown in, for example, FIG. 4 without extracting the film from the image, the projected image 8 on the screen 7 often does not become an upright image. It was

In such a case, for example, the projector main body 10 is rotated 90 ° in the direction of arrow A in the figure around the optical axis of the condenser lens while maintaining the reflecting mirror 9 of the overhead type projector 6 at the initial position. Although the projected image 8 on the screen 7 can be made to be an upright image by the conventional method, the conventional projector 6 of this type does not have any means for reliably and easily performing such a rotational movement. Therefore, it is extremely difficult to rotate the projector main body 10 without displacing the optical axis position of the condenser lens in the horizontal direction, and there is a problem that a considerable force is required to bring about the rotation. It was

Therefore, the applicant has previously proposed an image conversion device for surely and easily changing the direction of a projected image on a screen, as disclosed in Japanese Patent Application Laid-Open No. 56-47030 (Japanese Patent Application No. 54-12).
2827). This image conversion device enables the positioning and placement of the projector body, and has a rotary table with a surface area larger than the lower surface of the projector, and the rotary table is rotated around the optical axis of the condenser lens of the projector body mounted on it. A movably supporting pedestal, an arm member that has one end fixed to this pedestal and the other end that can project onto the projector main body on the rotating table, and a reflection that is attached to the tip of the arm member so that it can be lifted up and down. In this video conversion device, the projector main body is placed on the turntable with the help of the positioning means, and while the film image is projected onto the screen in such a state, the projected image is For example, in the case of a landscape orientation, the projected image can be made to be an erect image by rotating the rotary table together with the projector main body by 90 ° with respect to the gantry.

[0006]

However, in such an image conversion apparatus having a two-tiered structure, the rotary table has a larger surface area than the lower surface of the projector main body, and the frame located below the rotary table has the surface of the apparatus. Since it has a surface area considerably larger than that of the turntable for stabilization, the device itself becomes large in size, the structure is complicated, the handling is inconvenient, and the cost becomes high. There is
Further, in this conventional device, because of its large size, it is practically impossible to perform projection on a desk or the like having a surface area smaller than the area surrounded by the rotary contour line of the projector main body. was there.

The present invention advantageously solves the problems of the prior art, is simple, compact, and extremely easy to handle, and in addition, the pedestal surface area is surrounded by the rotary contour line of the projector main body. Even if it is narrower
(EN) Provided is a projection posture conversion mechanism of an overhead type projector which can smoothly rotate a projector main body to a desired position in a sufficiently stable state.

[0008]

According to the projection posture changing mechanism of the present invention, in particular, a support base, which is rotatably supported on the lower surface of the projector main body and is smaller than the projector main body, is preferably detachable. Attach it, align the center axis of its support with the optical axis of the condenser lens,
Mount the underframe that pivotally supports the rolling wheels so that it can be removably engaged with both side surfaces extending in the length direction of the projector main body at required positions separated from the support base in the length direction of the projector main body. It was done.

[0009]

In this projection posture conversion mechanism, a support base provided on the lower surface of the projector main body and two projections, for example, two slides engaged with the projector main body through the underframe at a position separated from the support base by a required distance. When a film image is projected onto the screen one after another while supporting the projector main body and others stably and horizontally by the moving wheel, when a specific projected image is projected horizontally on the screen, for example, a reflecting mirror, The sideways image is rotated by 90 ° in the direction in which it becomes an erect image, and then, under the action of the projection posture changing mechanism according to the present invention, the projector main body is moved up to the position where its reflecting mirror faces the screen. Around the and against its support
The posture of the projected image on the screen can be very easily, smoothly and quickly by rotating it by 0 ° or by rotating the projector body with respect to the support base while keeping the reflecting mirror at its initial position. The image on the screen can be converted into a proper upright image by converting

Here, while the support base reduces the frictional force between it and the projector main body, while increasing the frictional force between it and the mounting surface of the projector main body, if a smoother rotational movement of the projector main body is possible. Further, it is possible to more effectively prevent the displacement of the center of rotation during the swiveling movement.

As described above, the support base cooperates with the rolling wheels that dispersively support the weight of the projector, to the predetermined position while maintaining the horizontal posture of the projector main body.
It is possible to easily and smoothly allow a smooth rotational movement. Therefore, here, the structure of the projection posture conversion mechanism can be made simple and small, and its handling can be made extremely easy. Moreover, since this conversion mechanism is small in itself, even when the projector is placed on a narrow desk or other place and used, the projector is supported sufficiently stably and rotated as expected. Besides, it can be easily and easily stored as it is attached to the projector or detached from the projector even when it is not used.

In addition, in this conversion mechanism, in particular, the relative position of the rolling wheels with respect to the support base can be appropriately changed as required, so that, for example, when the projector main body is rotated, Even when the turning contour extends beyond the mounting surface, the projector wheel can be moved to a desired position in a sufficiently stable state by positioning the rolling wheels close to the support base. it can.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to illustrated examples. FIG. 1 is a diagram showing an embodiment of this invention. The overhead type projector here is a box-shaped projector main body 12 having a light source system (not shown) and a condenser lens 11 for directing a light beam from the light source system upward, and a projector main body 12 surrounding the upper end of the condenser lens. Of the transparent diffusion plate 13 that closes the upper surface of the condenser lens 11, a subject support stage 14 that is disposed above the condenser lens 11 and is movable in two dimensions in a plane orthogonal to the optical axis thereof, and one end of the projector main body. 12, an arm member 15 having the other end projecting above the projector body 12, a projection lens 16 attached to the arm member 15 on the optical axis of the condenser lens, and a projection lens attached to the arm member 15. And a reflecting mirror 17 located above 16 and capable of performing a turning motion and an elevation motion about the optical axis.

In such a projector, in this invention, as is apparent from the bottom perspective view of FIG. 1 (b), the support base 19 for rotatably supporting the projector body 12 on the lower surface 12a is provided. Is attached, and the mounting position of this support base 19 is set to a position where its central axis coincides with the upward optical axis of the condenser lens 11.

The support 19 having a surface area considerably smaller than that of the projector main body 12 can be attached to the lower surface 12a by, for example, riveting the center of the support base 19 to the bottom wall of the projector main body 12. It can be performed by engaging an annular support base 19 with the outer periphery of the annular retaining flange that is provided on the bottom wall of the main body.
In this latter example, the retaining flange can be formed of a single part that is integral with the bottom wall of the main body, or can be formed of a plurality of parts. It can be changed appropriately.

Further, here, the support base 19 and the lower surface 12
In order to reduce the frictional force with a and to facilitate the rotational movement of the projector main body 12 with respect to the support base 19, it is possible to dispose a ball or other anti-friction means between them. Since the weight of the projector main body 12 does not become so large, it is possible to configure the portion of the support base 19 that directly contacts the lower surface 12a with a plastic or other low friction member 19a having a small frictional resistance. It is preferable for providing simplification.

On the other hand, it is preferable that the portion of the support base 19 that comes into contact with the surface of the desk or the like be made of rubber or another high friction member 19b that can contact the surface with a sufficiently large frictional force. In some cases, the projector body 12
It is possible to effectively prevent the support base 19 from sliding on the surface of the desk, for example, during the rotation, so that the relative relationship between the optical axis of the condenser lens and the screen can be kept constant.

The lower surface 12a of the projector main body 12 to which the support base 19 can be attached in this manner also has a required distance from the support base 19 for stable support of the main body 12 and smooth rotational movement. After that, the rollers 23 as rolling wheels are engaged with both side surfaces of the projector main body 12.

Here, two rollers 23,
The engagement of each of 23 with the projector main body 12 is such that the respective rollers 23, 23 are substantially plate-shaped as a whole, and each end of an underframe 24 having a length longer than the width of the projector main body 12. While being pivotally supported on the part, the underframe 24 is provided with the respective engaging pieces 24a, 24a projecting to the side opposite to the rollers 23, 23,
These engaging pieces 24a can be indirectly brought into contact with each side surface of the projector main body 12 by surface contact, more preferably by elastic engagement, whereby the projections main body 12 of the rollers 23, 23 can be provided. It is possible to change the position of engagement with the hook very easily, and it is possible to select it appropriately as required.

According to the projection posture converting mechanism having the above-mentioned structure, when the projected image on the screen is in the sideways posture, the inverted posture, etc., the support base 19 and the rollers 23, 23 are operated. The projection posture of the projector can be extremely easily changed to a desired position around the support base axis line, in other words, the optical axis of the condenser lens. Moreover, according to this conversion mechanism, the rollers 23, 2
As described above, by bringing the position of engagement of the projector 3 with the projector main body 12 close to the support base 19, as described above, the projector main body 12 can be kept sufficiently stable even in a narrow mounting space, and as expected. It can be rotated.

In the above description, when the support base 19 is detachably attached to the projector body 12 by screw means, elastic engaging means, etc., the projector is rotated around the optical axis of the condenser lens 11. In the case of a projection that does not need to be moved, a support protrusion is attached instead of the support base 19 and the projector main body 12 is supported by the support protrusion and the rollers 23, 23, so that unexpected rotation of the projector can be sufficiently performed. It can be blocked and projected in a stable posture.

FIG. 2 is a perspective view and a partial cross-sectional side view illustrating another projection posture conversion mechanism. In this example, the support base 1 is used.
9 and both rollers 23, 23 or rollers 23, 2
Only 3 is detachably attached to the projector main body 12, and in addition, the support 19 and the rollers 23, 23 are connected to each other. The support base 19 here is formed by fitting a pin 19c integrally formed with the support base 19 into the projector main body 12, or
A male screw member (not shown), which is separate from the above, can be detachably attached to the projector main body 12 by screwing it into the main body 12, and the rollers 23, 23 can be attached to the projector main body 12 as described above. An underframe 24 for pivotally supporting the two rollers 23, 23 at a predetermined interval is provided with projecting projections on both sides of the projector body 12, preferably under elastic action of engaging pieces 24a. It can be done by fitting it to.

By the way, here, the underframe 24 is connected to the connecting bracket 25 through a long hole 25a provided at one end of the connecting bracket 25, and approaches the support base 19 along the long hole 25a. The bracket 25 can be moved in a separating direction, and the other end of the bracket 25 can be fitted to the center pin 19c of the support base 19 and the other end can be moved by the split ring 26, the snap ring, or the like. It is connected to the support base 19 by preventing the support frame 19c from coming off, and the relative movement amount of the underframe 24 with respect to the support base 19 can be specified.

Therefore, when the support base 19 and the underframe 24 are connected by the connecting bracket 25 as shown in the figure, the support base 19 is attached to the main body 12 and the roller 23 is attached to the side surface of the main body. You can bring the engagement.

Also in this example, the mounting positions of the rollers 23, 23 with respect to the projector main body 12 can be appropriately changed as required, so that the projector is rotated on a narrow mounting surface, for example. If
In other words, even when the projector protrudes from the mounting surface during its rotation, it is possible to ensure a sufficiently stable rotational movement of the projector by bringing the rollers 23, 23 closer to the support base side.

Further, not only in the above-described embodiment but also in this embodiment, the rollers 23, 23 can be easily removed from the main body 12, so that by removing it, the projector can be stored when the projector is not used. It does not interfere with storage,
In addition, it is possible to support the projector in a sufficiently stable manner when projecting without the need to rotate the projector.

In this example, when the engaging piece 24a is movable in the longitudinal direction of the underframe 24, the rollers 23, 23 can be attached to overhead type projectors having different widths.

Although the present invention has been described above based on the illustrated example, the rollers 23, 23 as rolling wheels may be balls, caster wheels, or the like.

[0029]

According to the present invention, therefore, it is possible to provide a projection posture conversion mechanism which has a simple structure and is small in size, and which can extremely easily and appropriately change the projection posture of the overhead projector.

In addition, here, the relative position of the rolling wheels with respect to the support base is changed or selected as required, so that the projector main body is placed in a space narrower than the area surrounded by the rotation contour line thereof. Even in such a case, the projector main body can always be kept stable, and the required rotational movement of the projector main body can be sufficiently permitted.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing another embodiment of a projection posture conversion mechanism.

FIG. 3 is a plan view illustrating a film jacket.

FIG. 4 is a perspective view illustrating a conventional overhead type projector.

[Explanation of symbols]

 11 Condenser lens 12 Projector body 12a Lower surface 13 Translucent diffuser plate 14 Subject support stage 15 Arm member 16 Projection lens 17 Reflector 19 Support stand 19c Pin 22 Support protrusion 23 Roller 24 Stand frame 24a Engagement piece 25 Connection bracket 25a Long hole

Claims (2)

[Scope of utility model registration request] 1. A box-shaped projector main body having a built-in condenser lens for directing light from a light source system upward, and a two-dimensional direction in a plane disposed above the condenser lens and orthogonal to its optical axis. To a subject support stage that can be moved to, a projection lens that is mounted on the arm member that projects upward from the projector main body and that is located on the optical axis of the condenser lens, and a projection lens that is mounted on the arm member above the projection lens. In an overhead type projector equipped with a reflecting mirror that makes it possible to raise and lower the light flux from the projector, the projector is rotatably supported on the lower surface of the projector body,
Attach a supporting base smaller than the projector main body, align the center axis of the supporting base with the optical axis of the condenser lens, and mount the underframe that pivotally supports the rolling wheels in the length direction of the projector main body with respect to the supporting base. A projection posture conversion mechanism for an overhead type projector that is detachably engaged with and attached to both side surfaces extending in the length direction of the projector main body at a position spaced apart from each other. 2. The projection posture conversion mechanism according to claim 1, wherein the support base is detachably attached to the projector body.