JPH08234311A - Reflection type overhead projector - Google Patents

Abstract

PURPOSE: To reduce the dead angle place where a projected image can not be admired, and allow a remote control. CONSTITUTION: A reflecting Fresnel lens 28 is placed on the upper surface of a projector body 11, a fan 18, a reflector 19, a light source lamp 20, a condenser lens 21, reflecting mirrors 22, 24 and a projecting lens unit 26 are arranged on the same optical axis on a head provided on an arm 12 rotatably connected onto the projector body 11, and the projecting direction directing a screen 32 is set orthogonal to the rotating surface of the arm 12. The projected light to a transmission original 30 placed on the reflecting Fresnel lens 28 is guided to the projecting lens 26, and projected onto the screen 32. Compared with a projector having a conventional structure in which the projecting direction directing the screen is parallel to the rotating surface of the arm, thus the dead angle place in the rear of the projector can be reduced. The projector can be remote-controlled by providing the remote-controllable projecting zoom lens 26 and a original automatic feeding device, and the operability is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type overhead projector, and more particularly to a reflection type overhead projector in which a projection head held by an arm supported by a projector body is provided with a light source lamp, a reflection mirror, a projection lens and the like.

[0002]

2. Description of the Related Art In a conventional reflection type overhead projector, a reflector 85, a light source lamp 86, and a condenser lens 8 are mounted on a head 84 held by an arm 82 rotatably supported by a projector body 81 as shown in FIG.
7, a projection lens 88, a reflection mirror 89, and the like, while a reflection Fresnel lens 90 is provided on the upper surface of the projector body 81.

A transparent original 92 is placed on the reflective Fresnel lens 90, and the transparent original 92 is illuminated with light from a light source. The illumination light transmitted through the transparent original 92 is reflected by the Fresnel lens 9
The image reflected and condensed at 0 and recorded on the transparent original 92 is projected. Then, the projection light of the recorded image is enlarged and projected on the screen 94 through the projection lens 88 and the reflection mirror 89.

[0004]

By the way, in the above-mentioned conventional reflection type overhead projector, when the projected image projected on the screen is viewed, the arm and the head interfere from the rear side of the main body and the There is a problem that there are places (blind spots) where images cannot be viewed. In addition, since the operator himself / herself has to set the original document, change the magnification of the projected image, adjust the focus, etc., there is a problem that the operability is poor.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a reflective overhead projector which can reduce the blind spots where the projected image cannot be viewed and which can be remotely operated.

[0006]

In order to achieve the above object, the present invention illuminates a transparent original placed on a reflective Fresnel lens provided on the upper surface of the projector main body with light, and projects a projected image of the transparent original. In a reflection-type overhead projector that projects light onto a screen via a projection lens, a projector main body having a reflective Fresnel lens on its upper surface and a base end of the projector main body foldably supported by the projector main body are erected above the reflective Fresnel lens. A possible arm and a light source, a reflection mirror, provided at the tip of the arm,
A projection head composed of a projection lens unit, light from the light source is transmitted through the document, reflected by the reflection Fresnel lens to be projection light, and the projection light is reflected by the reflection mirror, The projection direction of the projection light passing through the projection lens unit and passing through the projection lens unit is a direction orthogonal to the rotation surface of the arm.

[0007]

According to the present invention, the light source, the reflection mirror and the projection lens unit are arranged in the projection head provided at the tip of the arm foldably connected to the projector body,
In addition, since the projection direction toward the screen is orthogonal to the rotation surface of the arm, the blind spot behind the projector is larger than that of the projector having the conventional structure in which the projection direction toward the screen is parallel to the rotation surface of the arm. The place can be reduced.

Further, the projection lens is composed of a zoom lens capable of focusing and zooming by driving a motor,
The main body is provided with automatic document feeding means and remote control power supply section,
Since the zoom lens, the automatic document feeder, and the light source lamp can be controlled by operating the remote control, the operator can set the document, adjust the focus, or change the zoom magnification from a remote position, and the operability is improved. .

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of a reflective overhead projector according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a front external view for explaining the configuration of a reflective overhead projector according to the present invention, and FIG. 2 is a schematic cross-sectional side view of the reflective overhead projector of FIG. Figure). The reflective overhead projector includes a substantially rectangular projector main body 11, an arm 12 rotatably connected to the upper surface of the projector main body 11, a projection head 14 provided above the arm 12, and the like.

As shown in FIG. 1, when the projector is used, the arm 12 is pivoted on the projector main body 11 to stand up, and the projection head 14 is arranged directly above the projector main body 11. Further, after use, the arm 12 can be tilted and stored on the upper surface of the projector main body 11 as shown by the chain double-dashed line in the figure. A groove 14A is formed in the head 14, and a clamp member 15 for fixing the head 14 by engaging with the groove 14A when the arm 12 is folded is formed on the side surface of the projector body 11, and the clamp member 15 is provided.
And a fixing screw 16 for fixing the.

A recess 12A is formed in the arm 12, and spring plate clips 17, 17 are rotatably attached to both sides of the recess 12A. The supply stage 62 and the document receiving stage 64 can be fitted in the recess 12A and fixed by the clips 17 to be stored (see FIG. 4).

Now, as shown in FIG. 2, the projection head 1
4, a fan 18, a reflector 19 and a light source lamp 2
0, the condenser lens 21, the reflection mirrors 22 and 24, and the projection lens 26 are arranged on the same optical axis, while the reflection Fresnel lens 28 is horizontally arranged on the upper surface of the projector body 11. With the above optical system configuration,
The projection image of the transparent original 30 placed on the reflection Fresnel lens 28 is projected on the screen 32.

A metal halide lamp, for example, is suitable for the light source lamp 20, and a reflector 19 for efficiently utilizing the light amount of the light source lamp 20 is provided as the light source lamp 20.
The condenser lens 21 is arranged in front of the light source lamp 20. Further, the fan 18 for air-cooling the light source lamp 20 has a reflector 19
It is installed in the back of.

The reflection mirror 22 is fixed at an angle for reflecting the light source light condensed by the condenser lens 21 and illuminating the reflection Fresnel lens 28 provided on the upper surface of the projector body 11. On the other hand, the reflection mirror 24 is fixed at a position and an angle at which the projection light of the transparent original 30 reflected by the reflection Fresnel lens 28 is reflected toward the projection lens 26.

A reflective layer is formed on the back surface of the reflective Fresnel lens 28, and the light incident on the reflective Fresnel lens 28 is reflected by the reflective layer and then condensed by the Fresnel surface. The projection lens 26 is a zoom lens including a plurality of lenses 26a, 26b, and 26c, and is fixed to the front end of the head 14. The projection lens 26 is driven by the motor 33a so that the lens 26
a, 26b are driven to perform zoom magnification, and the motor 33b
The lens 26c is driven by to focus.
The motors 33a and 33b are connected to a remote control operation power supply unit 35 provided in the projector body 11.

Further, the projection lens 26 has a built-in variable aperture (not shown), and the brightness of the projected image projected on the screen 32 can be adjusted by changing the size of the aperture of the variable aperture. Remote control power supply 3
Reference numeral 5 is connected to the remote control light receiving section 36, and is operated by operating the remote control device 37 from the outside. The operation with the remote controller will be described later.

FIG. 3 is a plan sectional view (view taken along the line BB ′ of FIG. 2) for explaining the internal structure of the projector main body 11 of FIG. 1, and FIG. 4 is a schematic sectional view of FIG. As shown in FIG. 3, an automatic document feeder (ADF device) is installed in the projector body 11. This ADF device is
A motor 40 serving as a drive source, and rollers 41, 42, 43, shafts 45, 46, 47, 4 that transmit the rotational force of the motor 40.
8, document feeding belts 50a and 50b, document feeding belts 51a and 51b, a coupling belt 52, and the like.

The motor 40 is arranged on the document supply side (the right side in FIGS. 3 and 4) and the remote control operation power source 35 is provided.
Is operated by a remote control operation described later. A roller 41 is fixed to the motor 40, and rollers 42 and 43 are arranged in contact with the roller 41 as shown in FIG. The roller 43 is fixed to one end of a shaft 45, and the shaft 45 has a pair of bearings 55a, 5a.
It is rotatably attached to 5b. Also, the shaft 45
A shaft 46 is rotatably attached to the pair of bearings 56a and 56b at a position separated by a constant distance in parallel with
Document feed belts 50a and 50b are connected to the shaft 45.

Similar to the above, the original feeding side (see FIGS. 3 and 4)
Two shafts 47 and 48 are also rotatably arranged by bearings 57a, 57b, 58a and 58b, respectively, and are connected by document feeding belts 51a and 58b. The shaft 46 and the shaft 47 are connected by a connecting belt 52 so that the document feeding belts 50a and 50b and the document feeding belts 51a and 51b operate in an interlocking manner.

The setting of the setting position on the reflection Fresnel lens 28 when the transparent original 30 is supplied is performed by controlling the rotation of the motor 40 based on the circuit of the remote control operation power supply section 35. As shown in FIG. 4, guide members 60a and 60b for properly sliding the transparent original 30 are provided above the original feeding belts 50a and 50b and the original feeding belts 51a and 51b.

The rear surface of the projector body 11 (see FIG.
On the right side above), the transparent original 3 sent to the ADF device
The original feeding stage 62 on which 0 is mounted is attached with mounting screws 63, 63.
On the other hand, an original receiving stage 64 for receiving the transparent original 30 sent by the ADF device is detachably attached by a mounting screw 65 on the front surface of the projector main body.
A line 62A corresponding to the vertical and horizontal dimensions (for example, A4 size) of the original is drawn on the upper surface of the stage 62 so that the position where the transparent original 30 is placed can be easily recognized.

A remote control holding member 68 and a spare lamp holding member 69 are fixed to the left side (front side of the projector main body 11) in FIG. 3, and these holding members 68, 69 are provided.
The remote control device 37 and the spare lamp 70 can be fitted into the respective parts from the side and detachably attached (Fig. 5).
reference). On the other hand, as shown in FIG.
The plug portion 73a of the power cord 73 wound around the cord winder 72 is provided on the rear side of the projector main body 1
It comes out from the cord outlet formed in 1. When the projector is used, the plug 73a is pulled to pull out the power cord 73, and after use, the pulled power cord 73 is wound around the winder 72 and stored.

Further, as shown in the upper part of FIG. 3, in the connecting portion of the projector main body 11 and the arm 12, the arm rotating shafts 76, 76 are provided at two symmetrical positions, and the shaft 7 is provided.
The inner and outer ends of 6, 76 are fastened by nuts 77, 77. The rotation degree of the arm 12 can be adjusted by the nuts 77, 77. FIG. 5 is a front external view of the state where the arm 12 is folded on the upper surface of the projector body 11. As shown in the figure, when the arm 12 is folded on the projector main body 11, the clamp member 15 provided on the projector main body 11 side fits into the groove 14 </ b> A formed in the head 14. Further, the clamp member 15 is fixed by the fixing screw 16, and the head 14 can be securely locked so as not to separate from the projector body 11. Further, the arm 12 is provided with a handle 78, which makes it easy to carry.

FIG. 6 is an external view showing an example of the remote controller 37 of the reflective overhead projector of FIG.
The remote control device 37 includes a power switch 37A for turning on / off a power source, a focusing key 37B for the projection lens, a zoom magnification / reduction key 37C for the projection lens, and an ADF operation key 3.
It has 7D. The power switch 37A has a pilot lamp, and the lamp is lit while the power is on.

Further, the focusing key 37B and the zoom magnification key 37C are respectively composed of a plus key and a minus key, and operate the respective keys according to the in-focus state and the enlargement / reduction. When using the remote control device 37, the remote control device 37 is directed toward the remote control light receiving portion 36 formed on the projection head 14 and operated. Next, the operation of the reflection type overhead projector having the above configuration will be described.

First, the reflection type overhead projector is installed so that the projection lens 26 faces the screen 32, and the fixing screw 16 on the side surface of the projector body 11 is loosened to release the clamp member 15. Then, the arm 12 is erected from the projector body 11 and the head 14 is fixed at a predetermined height. Recess 12 formed inside arm 12
The stages 62 and 64 stored in A are taken out, and the mounting screws 63 and 6 on the front surface and the rear surface of the projector main body 11 are taken out.
It fits in 3, 65, 65, and it fixes each. afterwards,
The transparent original 30 is placed according to the original dimension line 62A drawn on the surface of the stage 62, and the transparent original 30 is inserted until it hits the original supply belts 50a and 50b in the groove of the guide member 60a. A plurality of transparent originals 30 can be prepared.

A fixing member 68 on the front surface of the projector main body 11
The remote control device 37 attached to is removed, and the power switch 37A of the remote control device 37 is turned on toward the remote control light receiving section 36 of the head 14. When the ADF operation key 37D is pressed after the light source lamp 20 is turned on, the transparent original document 30 on the stage 62 is conveyed by the original document supply belts 50a and 50b and moved onto the reflective Fresnel lens 28 on the upper surface of the projector body 11.

Illumination light from the light source lamp 20 is condensed by the condenser lens 21 and then reflected by the reflection mirror 22 toward the transparent original 30 on the reflective Fresnel lens 28. After passing through the transparent original 30, the reflected Fresnel. It is incident on the lens 28. The illumination light that has entered the reflective Fresnel lens 28 is reflected by the reflective layer of the reflective Fresnel lens 28, and then is condensed by the Fresnel surface to illuminate the transparent original 30 from the back surface and project the recorded image of the transparent original 30. . The projection light of the recorded image is reflected by the reflection mirror 24 toward the projection lens 26. This allows
The recorded image of the transparent original 30 is enlarged and projected on the screen 32 by the projection lens 26.

Then, the focus key 37C and / or the zoom conversion key 37B of the remote controller 37 are operated to adjust the projected image of the screen 32 for viewing. Further, by pressing the ADF operation key 37D of the remote control device 37, the viewed transparent original 30 is removed from the reflective Fresnel lens 28 and discharged to the stage 64 side, and the next transparent original 30 is moved to the reflective Fresnel lens 28. Appreciate the projected image in the same way as.

In this way, the illumination and projection optical system members are arranged in the head 14 provided above the arm 12, and the projection direction toward the screen 32 is orthogonal to the rotating surface of the arm 12. Therefore, the blind spots can be reduced as compared with the conventional projector having a structure in which the projection direction toward the screen 32 and the rotating surface of the arm are parallel to each other.

Further, since the photographing optical member arranged on the head 14 along the optical axis direction of the projected image has a long optical path length in the optical axis direction of the projected image, it is longer than the conventional projector. The height of the head can be lowered. As a result, the blind spots can be reduced and the entire device can be made compact. Further, after the projector is used, the stages 62 and 64 are set in the recess 1 of the arm 12.
2A, the arm 12 is folded as shown in FIG. 5, and the projector body 1 is clamped by the clamp member 15 and the screw 16.
1 and can be carried by holding the grip 78 provided on the side surface of the head 14. Thus, a compact projector suitable for carrying is provided.

[0032]

As described above, according to the reflection type overhead projector of the present invention, the illumination and projection optical system members are arranged on the head mounted on the arm rotatably connected to the cabinet, and Since the projection direction toward the screen is orthogonal to the rotation surface of the arm, it is possible to reduce the blind spots that obstruct the viewing of the projected image, providing a compact reflective overhead projector with excellent viewing characteristics. it can.

Further, since the original setting, the focus adjustment of the projection lens, the zoom magnification and the like can be remotely controlled by the remote control operation, the operability is improved and the utility value can be enhanced.

[Brief description of drawings]

FIG. 1 is a front external view for explaining a configuration of a reflective overhead projector according to the present invention.

2 is a schematic cross-sectional view of a side surface of the reflective overhead projector of FIG. 1 (a view taken along the arrow AA ′ in FIG. 1).

3 is a plan sectional view for explaining the internal structure of the reflective overhead projector body 11 of FIG. 1 (B--
(B 'arrow view)

4 is a schematic cross-sectional view of another side surface of the reflective overhead projector of FIG.

5 is a front external view of the reflective overhead projector of FIG. 1 with the arm folded onto the projector body 11. FIG.

6 is an external view showing an example of a remote control device 37 of the reflective overhead projector shown in FIG.

FIG. 7 is a side view for explaining the configuration of a conventional reflective overhead projector.

[Explanation of symbols]

 11 ... Projector main body 12 ... Arm 14 ... Projection head 15 ... Clamp member 16 ... Fixing screw 29 ... Reflector 20 ... Light source lamp 21 ... Condenser lens 22, 24 ... Reflective mirror 26 ... Projection lens 28 ... Reflective Fresnel lens 30 ... Transparent original 32 ... screens 33a, 33b, 40 ... motor 35 ... remote control power supply section 36 ... remote control light receiving section 45, 46, 47, 48 ... shafts 50a, 50b ... original supply belt 51a, 51b ... original delivery belt 52 ... connecting belt 76 ... arm rotation Axis of motion

Claims (2)

[Claims] 1. A reflective overhead projector for illuminating a transparent original placed on a reflective Fresnel lens provided on the upper surface of a projector main body with light and projecting a projected image of the transparent original onto a screen through a projection lens, A projector body having a reflective Fresnel lens on its upper surface, an arm whose base end is foldably supported by the projector body and which can stand upright above the reflective Fresnel lens, and a light source provided on the tip of the arm, and a reflector. A projection head including a mirror and a projection lens unit, the light from the light source is transmitted through the document and is reflected by the reflection Fresnel lens to be projection light, and the projection light is reflected by the reflection mirror. After that, the projection direction of the projection light passing through the projection lens unit and passing through the projection lens unit is Reflective overhead projector, which is a direction orthogonal to the moving surface. 2. The projection lens is composed of a zoom lens capable of focusing and zooming by driving a motor, and the projector main body is set or set by supplying a transparent original onto the reflective Fresnel lens. An automatic document feeding means for sending out the transparent original document and a remote control operation power source part which can be controlled by an external remote control operation are provided, and the motor, the automatic document feeder and the light source lamp are connected to the remote controller operation power source part. The reflective overhead projector according to claim 1, wherein