JPH08160538A - Overhead projector - Google Patents

Abstract

PURPOSE: To house the projector to be thin and compact at the time of non- projection and to make it convenient to carry by actuating a reflection mirror to a reflecting position lower than the lower surface of a main body or the inside housing position of the main body. CONSTITUTION: This projector is provided with a light source 2 in the overhead projector main body 1, a Fresnel lens 5 which is arranged on the upper surface 1a of the main body 1 and on which an original for projection 6 is placed, and a reflection mirror box 4 internally provided with the reflection mirror 3 actuated from the inside housing position of the main body 1 to the reflecting position lower than the lower surface 1b of the main body 1 in order to turn light emitted from the light source 2 to the Fresnel lens 5. At the time of projection, the optical path from the light source 2 to the Fresnel lens 5 is set from the light source 2 in the main body 1 to the Fresnel lens 5 via the reflection mirror 3 projected to the outside of the main body 1 lower than the lower surface 1b of the main body 1 so as to secure optical path length from the light source 2 to the Fresnel lens 5; and at the time of non-projection, the reflection mirror box 4 internally provided with the reflection mirror 3 is housed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overhead projector which can be stored more compactly and is convenient to carry.

[0002]

2. Description of the Related Art A light source is arranged in a main body of an over head projector under a Fresnel lens on which a projection original is placed so as to face the original and a light emitted from the light source and passing through the Fresnel lens is provided. There is an over head projector in which a projection lens and a projection mirror are arranged at the upper end of an arm standing up from the main body so as to be directed in the screen direction after imaging. The overhead projector with this configuration has the advantage that when the projection original is floated from the Fresnel lens, the projected images are unlikely to be duplicated and a clear image can be projected, but on the other hand, it cannot be stored compactly when not projected. There are drawbacks.

[0003] Therefore, various proposals have been made in order to be compactly housed during non-projection and convenient to carry. For example, the one described in JP-A-2-71241 has a mirror between a light source and a Fresnel lens,
At the time of storage, the projection head unit and its supporting member are stored so as to be in contact with the upper surface, side surface, and bottom surface of the overhead projector body. Further, the one disclosed in Japanese Patent Application Laid-Open No. 3-126021 is an overhead projector main body having an opening including a light source and communicating with the inside, and a projection original document mount in the main body for transmitting light from the light source. Table means, arm means mounted on the outside of the main body and movable between a standing position and a lowered position, and mast means held by the arm means arranged in the optical path so as to send an image to a remote screen while the mast means is in the standing position. Drive means for moving the projecting means through the opening between a non-retracting position outside the main body and a storing position arranged inside the main body when the arm means is in the lowered position. It consists of and.

[0004]

However, a Fresnel lens having a focal length capable of projecting a document of a practical size is used, and a corresponding distance between the light source and the Fresnel lens is ensured, and No overhead projector has been obtained in which the overhead projector main body is sufficiently thinned during projection.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above conventional problems and to provide an overhead projector which can be stored thinner and more compactly and is convenient to carry when not projecting.

[0006]

SUMMARY OF THE INVENTION An overhead projector according to the present invention includes a light source arranged in an overhead projector body, a Fresnel lens arranged on an upper surface of the body, and a light source emitted from the light source. A reflecting mirror box in which a reflecting mirror for operating the reflected light toward the Fresnel lens is operated, and an arm rising from the main body.
And a projection mirror for directing light from the projection lens in a screen direction, the projection mirror forming an image of the light passing through the projection original placed on the Fresnel lens and held by the Fresnel lens. The box is such that the reflection mirror is actuated to the reflection position below the lower surface of the body or to the internal storage position of the body.

The reflection mirror box is preferably formed in a multi-stage by arranging required shapes in a row. More preferably, the reflection mirror box is rotatably provided,
The main body has a reflection mirror box bottom portion having a spindle and a reflection mirror box scattered light shielding portion having a spindle.
In another more preferable embodiment, the reflection mirror box is rotatably provided, and the support shaft of the reflection mirror box bottom portion and the reflection mirror box scattered light shielding portion is shared with the main body. In another preferred embodiment, the reflective mirror
The box is rotatably provided, and the reflected mirror box scattered light is composed of a reflection mirror box bottom having a support shaft on the body and a bellows that defines from the bottom surface of the body to the reflection mirror box bottom. And a shielding portion. In a further preferred embodiment, the support shaft of the reflection mirror box bottom is located on the lower surface of the body.

The reflecting mirror box preferably includes an engaging member which is hooked by a lever provided with a spring member.
When the projection is started, the lever is slid in the direction in which the spring member extends to release the engagement with the engagement member, and the engagement release member interlocks with the operation of the engagement member when the projection is not performed. And the lever is slid in the direction in which the spring member extends, and the lever is engaged with the engaging member. The latch release means is preferably a solenoid.

The reflection mirror box is preferably provided with drop easing means for preventing a sudden drop during operation to the reflection position below the lower surface of the main body. The fall relaxation means is preferably a meshing means for freely engaging the rotary damper provided on the main body with the reflection mirror box. The meshing means is preferably a combination of a gear provided in the rotary damper rotating part and a gear separately provided in the reflection mirror box, or a gear provided in the rotary damper rotating part and a reflection mirror box separately provided. By the combination with the teeth on the provided flexible ribbon. In another preferred embodiment, the drop mitigating means is a gas cylinder or an air damper.

The reflection mirror box preferably moves to the reflection position below the lower surface of the main body or to the internal storage position of the main body to energize or cut off the power source of the light source.

The overhead projector of the present invention comprises:
A light source arranged in the overhead projector body,
A Fresnel lens disposed on the upper surface of the main body, a reflection mirror box in which a reflection mirror for operating light emitted from the light source is directed to the Fresnel lens, and a mirror standing up from the main body. And a projection mirror for directing light from the projection lens in the screen direction, the projection lens being formed on the Fresnel lens and formed on the Fresnel lens to form an image of the light passing through the projection original. Is protruded below the lower surface of the main body by a stand provided with folding means.

The overhead projector of the present invention is
Overhead A stand up from the projector body
A projection head including a projection lens held by a lens and a projection mirror is provided, and the projection head is configured so that the light passing through a projection document mounted on the Fresnel lens is imaged by the projection lens. And a means for relieving the bias. Preferably, the urging means is a coil spring or a gas damper, and the urging means is a rotary damper, an air damper or a gas damper.

The overhead projector of the present invention comprises:
Overhead A stand up from the projector body
A projection head including a projection lens and a projection mirror held by a lens, a biasing means for raising the arm when the projection head is set to a projection position, and a means for relaxing the bias. Is provided with an adjusting means for setting the arm angle so that the light passing through the projection original placed on the Fresnel lens is imaged by the projection lens. The adjusting means is preferably set with an eccentric rotating member. In another preferred embodiment, the adjusting means adjusts by the protruding amount of the screw.

[0014]

In the over head projector, the light emitted from the light source arranged in the main body is moved to the reflection position toward the Fresnel lens arranged on the upper surface of the main body, and the reflection mirror is operated.
The projection lens that forms an image of the light that has passed through the projection original placed on the Fresnel lens, which is held by the arm rising from the main body via this, and the light from the projection lens is screened.
And a projection mirror for directing the projection direction. When projected,
Since the reflection mirror box operates from the internal storage position of the main body to the reflection position below the lower surface of the main body, the optical path from the light source to the projection original projects from the light source inside the main body to the outside of the main body below the lower surface of the main body. Since the projection original is set via the reflection mirror, the optical path length from the light source to the projection original is secured, and the thickness of the main body when the reflection mirror box is stored (when not projecting) is set to the reflection mirror box. Can be made thinner by the amount that it protrudes below the lower surface of the main body.

Since the reflection mirror box is formed in a multi-stage by arranging the required shapes in rows, the reflection mirror inside the reflection mirror box is formed in multiple stages below the lower surface of the main body and outside the main body. It is possible to set the optical path from the light source to the projection original by projecting by the configured amount. On the other hand, at the time of non-projection, the reflection mirror box can be stored by compressing the multi-stage to a thickness equivalent to a single stage, so that the multi-stage configuration is performed after ensuring the required optical path length from the light source to the projection original. The thickness of the main body during storage can be reduced according to the amount of projection of the reflection mirror box.

The reflection mirror box is provided with an engaging member which is latched by a lever provided with a spring member, and the lever is stretched by the latch releasing means at the start of projection (FIG. 3). Slide to the right), the engagement between the lever and the engaging member provided on the side wall of the reflection mirror box is released, and the reflection mirror box is moved down from the lower surface of the main body to set the projection state. . On the other hand, when the reflection mirror box is lifted during non-projection, the inclined portion of the engaging member provided on the side wall of the reflection mirror box extends in the direction in which the spring member extends the lever (see FIG. 3).
After the engaging member passes the lever, the lever returns by the force of the spring member and the latch member is latched, and the reflection mirror box is housed and fixed in the main body. When the latch releasing means is a solenoid, when the power of the over head projector is turned on, the solenoid operates and the lever slides to the right in FIG.
As a result, the engagement of the bottom of the engaging member provided on the side wall of the lever and the reflection mirror box is released, and the reflection mirror box can be moved down from the lower surface of the main body and set to the projection state.

Since the reflection mirror box is provided with a drop easing means so as not to drop abruptly when the reflection mirror box is moved to a reflection position below the lower surface of the main body, the shock when the reflection mirror box is dropped is relaxed and safety is ensured. Security and failure are avoided. According to the meshing means for freely engaging the rotary damper and the reflection mirror box, the drop mitigating means can effectively absorb the impact by the rotation torque of the rotary damper according to the weight and the falling speed of the reflection mirror box. .

When the power of the over head projector is turned on, the solenoid is actuated to slide the lever, and the engagement between the lever and the engaging member provided on the side wall of the reflection mirror box is released to cause reflection. The mirror box descends from the bottom surface of the main body and is set to the projection state. At the same time, the micro switch installed inside the main body and interposed in the electric circuit between the power source of the over head projector and the light source is pushed on the bottom surface of the reflection mirror interlocking with the reflection mirror box, and the micro switch is turned on. It becomes a state. On the contrary, when the reflection mirror box is housed in the main body during non-projection, the micro switch is released from the bottom surface of the reflection mirror and turned off.
The light source is disconnected from the power supply. Therefore, even if the power switch is accidentally turned on in the housed state, the light source is not turned on and the safety can be improved.

The over head projector is a reflection mirror in which light emitted from a light source arranged in the main body is moved to a reflection position toward a Fresnel lens arranged on the upper surface of the main body.
And the light from the projection lens and the projection lens that forms an image of the light that has passed through the projection original placed on the Fresnel lens, which is held by the arm raised from the main body via this, and directs the light from the projection lens in the screen direction. With a projection mirror, the reflection position is projected below the lower surface of the main body by a stand having a folding means, to secure a space in which a reflection mirror box in which a reflection mirror is installed operates. When not projecting, reduce the thickness of the folding body.

An overhead head is provided with a projection head including a projection lens held by an arm raised from a main body of the projector and a projection mirror, and is provided with an arm for erecting the arm when the projection head is set to a projection position. Since there is a biasing means and a means for relaxing the bias, when the lock lever of the arm holding the projection head is released during projection, the arm holding the projection head is automatically set to the projection position.

Overhead A projection head including a projection lens and a projection mirror held by an arm standing upright from the projector main body, and a biasing means for erecting the arm when the projection head is set to a projection position. The projection head has an arm angle set by a spindle connecting the arm and the main body so that the light passing through the projection original placed on the Fresnel lens is imaged by the projection lens. Since the adjusting means for adjusting the position is provided, the position of the projection head can be easily adjusted. Preferably, since the arm angle is adjusted by the eccentric rotating member, the distance between the fixed portion of the stopper and the arm is changed, and the position of the projection head can be freely changed. More preferably, the arm angle is adjusted by the protrusion amount of the screw protruding from the main body, so that the position of the projection head can be freely changed.

[0022]

Embodiments will be described in detail below with reference to the drawings. FIG. 1 is an embodiment showing the projection state of the present invention. FIG.
In the overhead projector main body 1, the light source 2 in the main body 1, the Fresnel lens 5 on which the projection original 6 placed on the upper surface 1 a of the main body 1 is placed, and the light emitted from the light source 2 are Fresnel. To face the lens 5, there is provided a reflection mirror box 4 in which a reflection mirror 3 which operates from an internal storage position of the main body 1 to a reflection position below the lower surface 1b of the main body 1 is installed. At the time of projection, on the upper end of the arm 7 standing up from the main body 1, a projection lens 8 that forms an image of the light that has passed through the projection original 6 and the light from the projection lens 8 is enlarged and projected in the screen direction. The projection head 10 having the projection mirror 9 thus constructed is held. In the past, when the thickness of the main body 1 was made thin, the focal length of the Fresnel lens 5 had to be shortened, and there was a limit in making the Fresnel lens 5 capable of projecting a large original 6 for projection with a short focus. But when projected,
Since the optical path from the light source 2 to the Fresnel lens 5 is set to the Fresnel lens 5 via the reflection mirror-3 protruding from the light source 2 in the body 1 to the outside of the body 1 below the lower surface 1b of the body 1, from the light source 2 After securing the optical path length up to the Fresnel lens 5, at the time of non-projection, as shown in FIG. 2, the reflection mirror box 4 in which the reflection mirror-3 is installed is housed,
The thickness of the main body 1 can be reduced by the amount that the reflection mirror 3 protrudes to the outside of the main body 1 below the lower surface 1b of the main body 1, and miniaturization can be achieved.

The reflection mirror boxes 4 were formed in multiple stages by arranging the required shapes in rows. Such a reflection mirror box 4
According to the above, the internally installed reflection mirror-3 is attached to the lower surface 1b of the main body 1.
The reflection mirror box 4 is formed in multiple stages outside the main body 1 below, and the outside of the main body 1 is provided by the amount of the reflection mirror boxes 4 and the Fresnel lens 5
I was able to set the required optical path up to. On the other hand, at the time of non-projection, since the reflection mirror box 4 can be stored by compressing the multi-stage to a thickness corresponding to almost a single stage, the main body at the time of storage depending on the protruding amount of the multi-stage reflection mirror box 4. The thickness of 1 can be reduced. Preferably, the reflection mirror box 4 is rotatably provided and has a support shaft on the main body 1.
The box bottom part 4b and the reflection mirror box scattered light shielding part 4a having a support shaft at another position of the main body 1 are formed and are operated in conjunction with each other. On the other hand, the reflection mirror box bottom 4b
Also, the support shaft of the reflection mirror box scattered light shielding portion 4a may be shared by the main body 1. Further, the reflection mirror box 4 is rotatably provided, and is composed of a reflection mirror box bottom portion 4b having a support shaft on the main body 1 and a bellows that defines from the bottom surface 1b of the main body to the reflection mirror box bottom portion. It is also preferable that the reflection mirror box scattered light shielding portion 4a is used. In this way, the reflection mirror box scatterer which is rotatably provided and has a support shaft on the main body 1 and a bellows which is defined from the lower surface 1b of the main body to the reflection mirror box bottom portion 4b. A reflection mirror having a light shielding portion 4a
According to the box 4, scattered light from the reflection mirror box 4 can be almost eliminated. It is also preferable that the support shaft of the reflection mirror box bottom portion 4b is on the lower surface 1b of the main body 1. On the other hand, the reflection mirror-3 is attached to the reflection mirror box 4 and operates in conjunction therewith. At this time, in the jig 29 for fixing the reflection mirror, the contact portion with the reflection mirror-3 is a rubber roller.
When the reflection mirror 3 is fixed, the reflection mirror 3 can be fixed without being damaged, and the reflection mirror 3 acts so as not to move when it is operated or when it is carried.

FIG. 3 is a partial sectional view taken along the line AA in FIG. 1. FIG. 4 shows a state in which the reflection mirror box 4 is housed and hooked in the main body 1 at the time of non-projection. FIG. 8 is a vertical cross-sectional view showing how the lever 14 and the engagement member 13 of the reflection mirror box are hooked. The reflection mirror box 4 is provided with an engaging member 13 for the lever 14 on which a spring member 15 is elastically mounted, and is provided on the side wall of the reflection mirror box 4 when the reflection mirror box 4 is lifted (upward in FIG. 4) during non-projection. Engagement member 1
The lever 14 is slid in the arrow direction (the right direction in FIG. 4) for extending the spring member 15 by the inclined portion 27 of 3.
The bottom surface 28 of the engaging member 13 of the reflection mirror box is levered.
After passing through the lever 14, the lever 14 is moved by the spring member 15 as shown in FIG.
In the leftward direction, the hooking member 13 is hooked, and the reflection mirror box 4 can be hooked, stored and fixed in the main body. On the other hand, when the projection is started, the lever 14 is slid in the arrow direction (the right direction in FIG. 4) for extending the spring member 15 by the latch releasing means, and the lever 14 and the reflection mirror provided on the side wall of the reflection mirror box 4 are slid. Bottom 2 of box engagement member 13
The latch 8 is released from the lever 14, and the reflection mirror box 4 can be moved down from the lower surface 1b of the main body to set the projection state. When the solenoid 16 is used as the latch release means, the solenoid 16 is activated when the power of the main body 1 is turned on, and the lever 14 slides in the arrow direction (right direction) in FIG. As a result, the engagement of the lever 14 and the engaging member 13 of the reflection mirror box provided on the side wall of the reflection mirror box 4 by the spring member 15 is released, and the reflection mirror box 4 is simply turned on. It was possible to set the projection state by moving downward from the lower surface 1b of the main body with the stop release means.

FIG. 5 shows an embodiment of the fall easing means of the reflection mirror box according to the present invention. The reflection mirror box 4 moves to a reflection position below the lower surface 1b of the main body 1,
A drop mitigating means is provided to prevent a sudden drop. The fall mitigating means mitigates the impact of the reflection mirror box 4 when it falls, ensuring safety and avoiding failure. It is preferable that the drop mitigating means is a meshing means for freely engaging the rotary damper 17 provided on the main body 1 and the reflection mirror box 4. According to the meshing means for freely engaging the rotary damper 17 and the reflection mirror box 4 as described above, the rotation torque of the rotation damper 17 can be effectively alleviated according to the weight and the falling speed of the reflection mirror box 4. It became so. Further, the meshing means may be a combination of a gear provided on the rotating part of the rotary damper 17 and a tooth on a flexible ribbon 18 separately provided on the reflection mirror box 4, as illustrated in FIG. 5, or It is preferable to use a combination of a gear provided on the rotating part of the rotary damper 17 and a gear attached to the reflection mirror box 4. Furthermore, it is preferable that the fall easing means is an air damper or a gas cylinder.

In FIGS. 3 and 4, when a power source (not shown) provided in the overhead projector main body 1 is turned on, the solenoid 16 is actuated, and the lever 14 having the spring member 15 elastically attached is shown in FIG. 3 is slid in the direction of the arrow 3 to release the engagement between the lever 14 and the engagement member 13 provided on the side wall of the reflection mirror box 4, and the reflection mirror box 4 is released.
Is lowered from the lower surface 1b of the main body 1 and is set in a projected state. At the same time, in FIG. 1 and FIG.
The microswitch 11 interposed in the electric circuit between the power source provided in the main body 1 and the light source 2 is pushed by the downward movement of the reflection mirror-3 during projection as shown in FIG. become. On the contrary, as shown in FIG. 2, when the reflection mirror box 4 is housed in the main body 1 at the time of non-projection, the micro switch 11 is opened from the bottom surface of the reflection mirror 3 in the main body 1 and turned off. , The light source 2 is disconnected from the power supply. Therefore, even if the power switch of the main body 1 is mistakenly turned on in the housed state, the light source 2 is not turned on and safety can be improved. The micro switch 11 is a normally open type, but a normally closed type micro switch is also possible.

The stand 12 shown in FIG. 1 can be circumscribed on the lower surface 1b of the main body 1. The stand 12 is the main body 1
A predetermined space can be maintained between the lower surface 1b of the main body 1 and the installation surface of the main body 1 so that the reflective mirror box 4 in which the reflective mirror 3 is installed can be moved down to the reflection position from the lower surface 1b. it can. Further, the foldable stand 12 makes it possible to circumscribe and store the lower surface 1b of the main body 1 for compact transportation when not projecting.

FIG. 6 shows an embodiment showing the projection and storage states of the projection head and arm according to the present invention. In FIG. 6, the arm 7 that holds the projection head 10 is rotatable about the main body as a support shaft, and a damper connection that holds a damper 26 that urges the projection head 10 to the projection position coaxially with the support shaft 31 of the arm 7. Since the lever 25 is provided and a member for adjusting the arm angle is provided at a position where the light passing through the projection original is matched with the projection lens, the arm angle can be freely adjusted.

FIG. 8 shows an embodiment of an angle adjusting mechanism for the arm 7. To set the projection head to the projection position, the eccentric rotating member 22 that can finely adjust the position of the projection head 10 is used.
The arm 7 is rotated by the support shaft 30 so as to be eccentric.
Can be adjusted, and the projection head 10 can be accurately set at the projection position. By adjusting the eccentric rotating member 22 as described above, the arm angle can be freely changed. At this time, the eccentric rotatable member 22 has a mechanism that rotates only in the direction opposite to the screw tightening. For example, a mechanism such as a one-way clutch or a ratchet structure is preferable.

FIG. 9 shows another embodiment of the angle adjusting mechanism of the arm 7. To set the projection position, the arm angle is adjusted such that the screw hole is substantially parallel to the wall of the main body, and the tip of the male screw passed through the screw hole is pressed against the arm 7 in the rotating direction of the arm 7. Use means. The arm 7 has an adjusting screw 23.
When is rotated in the positive direction, it tilts in the storage direction around the support shaft 31. Further, when it is rotated in the negative direction, it is tilted in the projection direction. Thus, the angle of the arm 7 can be freely adjusted by changing the protrusion amount of the adjusting screw 23.

As illustrated in FIG. 6, the arm 7 is rotatably connected to the main body 1, and the projection head 10 is moved to a predetermined position by a biasing means and a means for relaxing the bias at the start of use. , Automatically keep the projection position at an angle. Further, by tilting the arm 7 holding the projection head 10 to the side surface so as to contact the main body 1, the arm 7 and the projection head 1
0 is locked by a lock mechanism installed on the side surface of the main body 1. As shown in FIG. 7, in a preferred embodiment, the arm 7 and projection head 10 include a gas damper-2.
6 (see FIG. 6) always maintains the standing posture. For this reason, there is no fear of falling to the main body 1 side, and the lock mechanism is not destroyed by an unreasonable operation. The arm 7 pushes the lock lever 19 which rotates around the support shaft 20 in the direction of arrow b in FIG. 7 in order to maintain the stored state, and the lock lever 19 is returned to the original position by the spring 21 biased as the arm 7 passes. Return to the state. The spring at this time may be a tension or compression spring. The lock lever 19 limits the range of both rotations by a stopper provided on the holding stay 24. The means for urging the projection head in the projection position direction is preferably a gas damper or a spring. Further, the relaxing means is preferably a gas damper, an air damper, or a rotary damper.

[0032]

As described above, according to the present invention, the following effects can be obtained.

(A) Since the reflection mirror projects outside the main body below the lower surface of the main body, the thickness of the over head project main body can be stored thinner and more compactly by the thickness projected when not projecting. , We are now able to provide an overhead projector that is convenient to carry.

(B) Since the reflection mirror boxes are formed in multiple stages by arranging the required shapes in a row, the reflection mirror boxes provided inside the main body are below the lower surface of the main body and outside the main body, and the reflection mirror boxes are provided in multiple stages. The required optical path from the light source to the original for projection can be set according to the configuration, and when not projecting, the multistage can be stored by compressing the multistage to a thickness equivalent to almost a single stage. The thickness of the main body during storage can be reduced according to the amount of projection of the configured reflection mirror box.

(C) By means of the pressing means and the pressing releasing means of the reflection mirror box, it can be stored and fixed during non-projection, and moved down from the lower surface of the main body during projection to set the projection state.

(D) Since the reflection mirror box is provided with a drop easing means at the reflection position below the lower surface of the main body so as not to drop suddenly during operation, the shock when the reflection mirror box is dropped is reduced, Ensuring safety and avoiding breakdowns.

(E) The light source is turned on even if the power switch is mistakenly turned on in the housed state by the micro switch provided inside the main body and interposed in the electric circuit between the power source of the over head projector and the light source. I was able to improve the safety.

(F) A stand provided with a folding means allows the reflection mirror box in which the reflection mirror is installed to be moved down from the lower surface of the main body to the reflection position so that the reflection mirror is provided between the lower surface of the main body and the installation surface of the main body. You can now secure a space for the box to work. Furthermore, the foldable stand was circumscribed and stored on the lower surface of the main body, and could be carried compactly when not projecting.

(G) Since the projection head has means for urging the arm when the projection head is set to the projection position and means for easing the bias, the lock lever of the arm holding the projection head at the time of projection is released. Then, the arm holding the projection head could be automatically set to the projection position.

(H) The arm for holding the projection head is provided with a damper connecting lever which is rotatable about the main body of the arm and which holds a damper for urging the projection head to the projection position coaxially with the arm shaft. A member for adjusting the arm angle is provided on the support shaft connecting the arm and the main body at a position where the light passing through the projection document is directed to the screen, so that the arm angle can be freely adjusted. It was

[Brief description of drawings]

FIG. 1 is an embodiment showing a projected state of an overhead project according to the present invention.

FIG. 2 is an embodiment showing a housed state of an over head project according to the present invention.

3 is a partial cross-sectional view taken along the line AA of FIG.
It is an embodiment showing a state in which a reflection mirror box is stored and hooked therein.

FIG. 4 is a vertical cross-sectional view showing how the lever 14 shown in FIG. 3 and the engagement member 13 of the reflection mirror box are hooked.

FIG. 5 is an embodiment of the fall mitigating means of the reflection mirror box according to the present invention.

FIG. 6 is a perspective view of the projection head and the arm according to the present invention;
It is an example which shows a projection state.

FIG. 7 is an embodiment of a holding mechanism for the arm of the projection head of the present invention.

FIG. 8 shows an embodiment of the angle adjusting mechanism of the arm of the projection head according to the present invention.

FIG. 9 shows another embodiment of the arm angle adjusting mechanism of the projection head of the present invention.

[Explanation of symbols]

1 Overhead Projector Main Body 1a Overhead Projector Main Body 1b Overhead Projector Main Body Lower Surface 2 Light Source 3 Reflective Mirror 4 Reflective Mirror Box 4a Scattered Light Shielding Part of Reflective Mirror Box 4b Bottom of reflection mirror box 5 Fresnel lens 6 Projection document 7 Arm holding projection head 8 Projection lens 9 Projection mirror 10 Projection head 11 Light source when reflection mirror box moves to reflection position or internal storage position Micro switch for energizing or interrupting the power supply of 12 The foldable stand 13 The engagement member of the reflection mirror box 14 The lever on which the spring member 15 is elastically mounted 15 The spring member acting on the lever 16 The solenoid 17 The rotary damper 18 The flexible ribbon 19 Lock lever of arm 20 Support of lock lever 21 spring for urging lock lever 22 eccentric rotating member for adjusting arm angle 23 screw for adjusting arm angle 24 stay for holding lock lever 25 damper connecting lever 26 gas damper for urging the projection head in the projection direction 27 Inclined Part of Engaging Member of Reflective Mirror Box 28 Bottom Part of Engaging Member of Reflective Mirror Box 29 Fixing Fixture of Reflective Mirror 30 Spindle of Eccentric Rotating Member for Adjusting Arm Angle 31 Arm 7 and damper connecting lever 25 support shaft

Claims (12)

[Claims] 1. A light source arranged in an overhead projector main body, a Fresnel lens arranged on an upper surface of the main body, and a reflection operating at a reflection position for directing the light emitted from the light source to the Fresnel lens. Reflective mirror with internal mirror
A box, a projection lens which is held by an arm standing up from the main body, forms an image of light that has passed through a projection original document placed on the Fresnel lens, and a screen from the projection lens.
An overhead projector having a projection mirror for directing the reflection mirror box, wherein the reflection mirror box has the reflection mirror at the reflection position below the lower surface of the main body, or the internal storage of the main body. An overhead projector characterized by being operated in a position. 2. The over head projector according to claim 1, wherein the reflection mirror box is formed in multiple stages by arranging a required shape in a row. -Head projector. 3. The over apparatus according to claim 1 or 2.
A head projector, wherein the reflection mirror box is a lever in which a spring member is elastically mounted.
A locking releasing means for releasing the locking with the engaging member by sliding the lever in a direction in which the spring member extends at the start of projection, The lever is interlocked with the operation of the engaging member during projection.
And an engaging means adapted to engage with the engaging member by sliding the spring member in a direction in which the spring member extends, and the over head projector. 4. The overhead projector according to claim 3, wherein the latch releasing means is a solenoid. 5. The over apparatus according to claim 1.
A head projector, wherein the reflection mirror box is provided with drop easing means for preventing a sudden drop during operation to the reflection position below the lower surface of the main body. projector. 6. The overhead projector according to claim 5, wherein the drop mitigating means is a meshing member that freely engages a rotary damper provided on the main body with the reflection mirror box. An overhead projector characterized by being means. 7. The over apparatus according to claim 1.
A head projector, wherein the reflection mirror box is moved to the reflection position below the lower surface of the main body or to the internal storage position of the main body to energize or cut off the power source of the light source. An overhead projector characterized by: 8. A light source arranged in an overhead projector main body, a Fresnel lens arranged on an upper surface of the main body, and a reflection operating at a reflection position for directing the light emitted from the light source to the Fresnel lens. Reflective mirror with internal mirror
A box, a projection lens which is held by an arm standing up from the main body, forms an image of light that has passed through a projection original document placed on the Fresnel lens, and a screen from the projection lens.
An overhead projector having a projection mirror directed in the direction of the arrow, wherein the reflection position is provided below a lower surface of the main body by a stand having folding means. Bar head projector. 9. A projection lens and a projection mirror held by an arm raised from an overhead projector main body.
An overhead projector including a projection head including: the projection head, wherein the projection head has the arm so that light passing through a projection document placed on a Fresnel lens is imaged by the projection lens. An overhead projector comprising an urging means for standing up and a means for relaxing the urging. 10. The overhead projector according to claim 9, wherein the projection head is configured so that light passing through a projection document placed on a Fresnel lens forms an image with the projection lens. An overhead projector characterized in that adjustment means for setting an arm angle is provided in the. 11. The overhead head projector according to claim 10, wherein the adjusting means adjusts with an eccentric rotating member. 12. The overhead head projector according to claim 10, wherein the adjusting means adjusts by a projecting amount of a screw.