JPH10236078A - Electronic blackboard and its casing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a casing for an electronic blackboard, capable of replacing a lamp by a general user. SOLUTION: A reduced optical system including a lamp 9 for projecting light onto a screen for writing and a lens for reducing reflected light from the screen is housed in a frame 3 in such a manner that the lamp 9 and at least a part of the reduced optical system other than the lamp 9 are separated from each other. The back surface of the frame 3 is covered with both of a board 16 for a lamp, which overs the lamp 9, and a back board 15 for covering a portion which is not covered with the board 16 for the lamp.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic blackboard for reading and printing an image written on a writing screen and a housing thereof.

[0002]

2. Description of the Related Art An electronic blackboard includes a reduction optical system having a lamp, a mirror, and a lens, a reading unit such as a CCD for reading characters and the like written on a screen, and a printer. The contents handwritten on the screen can be printed as they are.

In such an electronic blackboard, an endless writing screen is irradiated with light from a lamp, and a mirror further reflects reflected light from the screen toward a lens, and the reflected light is reduced by the lens. The light passing through the lens is sequentially read by a reading unit such as a CCD for each line along the main scanning direction, and the image read by this reading unit is printed by a printer. The lamp is a 35 W fluorescent lamp or the like, and a 50 to 60 times reduction optical system is used.

Here, the reduction optical system is housed in the housing of the electronic blackboard. However, since the lens included in the reduction optical system dislikes dust, it is possible to prevent the occurrence of disturbance due to external light. Therefore, the housing of the electronic blackboard is configured to have airtightness.

[0005] In addition, since a fluorescent lamp emits light in the circumferential direction due to its shape, there is known a fluorescent lamp provided with a reflector along the periphery of the fluorescent lamp in order to effectively use the light amount of the fluorescent lamp. ing.

[0006] The amount of light emitted from the fluorescent lamp is smaller at both ends than at the center, and the reading accuracy at the both ends along the longitudinal direction of the fluorescent lamp on the screen is low unless some care is taken. Become. In view of this, it has been performed to install the reflecting plate so as to face only both ends in the longitudinal direction of the fluorescent lamp.

A conventional example of such an electronic blackboard is shown in FIG.
This will be described with reference to FIG. Electronic blackboard housing 1
The frame 3 surrounds four sides of an endless writing screen 2 provided on the front, and a rail member 5 supporting a backboard 4 is fixed to the back of the frame 3 with screws 6, and is shown inside. It houses a reduction optical system and a reading unit that are not used.

As shown in FIG. 9B, the rail member 5 has an S-shaped groove in cross section, and surrounds the frame 3 and the backboard 4 in a state where they are overlapped with each other. Therefore, the housing 1 has airtightness. Frame 3
Are formed so as to have a rigidity not to be twisted, and secure the hermeticity of the housing 1. Since the housing 1 has the hermeticity, disturbance due to external light does not occur in the reduction optical system.

A stand 7 for fixing the screen 2 to a predetermined height is fixed to the frame 3. Further, a printer 8 for printing an image of the screen 2 on a sheet (not shown) is attached to a lower portion of the frame 3.

A fluorescent lamp 9 is a member of the reduction optical system.
Are vertically arranged and attached to the end in the frame 3. As shown in FIG. 10, light from the fluorescent lamp 9 is opposed to the upper and lower ends of the fluorescent lamp 9 on the upper and lower portions of the frame 3 extending in the horizontal direction.
A reflection plate 10 for reflecting light toward is mounted. The reflecting plate 10 is formed with bent portions 10a and 10b for attaching the reflecting plate 10 to the frame 3, and one of the bent portions 1
Oa is connected to the frame 3 by rivets 11, and the other bent portion 10 b is fastened to the frame 3 by screws 12. By removing the screw 12, the reflection plate 10 is rotatable around the rivet 11 between a reflection position surrounding the fluorescent lamp 9 and an open position opening the periphery of the fluorescent lamp 9. A screw mounting hole (not shown) is formed in the frame 3 so that the screw 12 can be tightened when the reflecting plate 10 is turned to the reflecting position. FIG.
Is rotated to the reflection position.

In the electronic blackboard having such a structure, the fluorescent lamp 9
The backboard 4 is removed during replacement or maintenance. When replacing the fluorescent lamp 9, the screw 12 is removed and the reflector 10 is turned to the open position so that the fluorescent lamp 9 does not hit the reflector 10. After the replacement work of the fluorescent lamp 9 is completed, the reflecting plate 10 is rotated to the reflecting position,
Tighten the screw 12.

[0012]

SUMMARY OF THE INVENTION In a conventional electronic blackboard,
Even simple tasks such as replacement of the fluorescent lamp 9 need to be performed by a specialized service person. However, the serviceman takes a long time to come after calling, and may be kept waiting for many days depending on the serviceman's work, which is inconvenient in a hurry. In particular, since the electronic blackboard is used for a conference or the like, when the fluorescent lamp 9 needs to be replaced, it is necessary to replace it as soon as possible.

Here, the reason why even a simple operation such as replacement of the fluorescent lamp 9 must be entrusted to a specialized service person lies in the structure of the housing 1 of the conventional electronic blackboard.
For example, in a conventional case 1 as shown in FIG. 6, the back surface is covered with a back board 4 made of one member. With such a structure, the backboard 4 is removed every time the fluorescent lamp 9 is replaced, and all the components such as the reduction optical system and the reading unit housed in the housing 1 are exposed. Become.

Although the technique of replacing the fluorescent lamp 9 is not difficult, the reduction optical system is exposed when the back board 4 is removed. You may touch the system lens, electrical unit, or adjustments. In this case, there is a possibility that dirt may be attached or each part may be displaced. For example, if the lens gets dirty, there is a problem in reading an image on the screen 2. In addition, when the position shift occurs, an inconvenience such that the image on the screen 2 is not accurately read or the read image is not accurately transmitted to the printer 8 is caused.

Since the lens dislikes dust, it is desirable to avoid exposing the lens as much as possible.

Further, when replacing the fluorescent lamp 9, it is necessary to rotate the reflecting plate 10 to an open position which does not hinder the replacing operation of the fluorescent lamp 9, and to return to the reflecting position after the replacing operation is completed. In order to rotate the reflection plate 10 in this way,
The screw 12 must be attached and detached using a tool, and the work of attaching and detaching the screw 12 is troublesome even for a service person. In particular, the work of tightening the screw 12 of the upper reflector 10 is very troublesome because the screw 12 is inserted upward at a position higher than the height of the serviceman.

Accordingly, the present invention provides a housing for an electronic blackboard in which a general user can replace the lamp without adversely affecting the reduction optical system, and a simple replacement of the lamp without the need for the general user. The purpose is to obtain an electronic blackboard that can perform

[0018]

According to the first aspect of the present invention, a reduction optical system including a lamp for irradiating a writing screen with light and a lens for reducing reflected light from the screen is a reduction optical system other than the lamp and the lamp. At least a part of the system is housed in a frame so as to be separated, and the lamp board covers the lamp from the back, and the back board covers the part not covered by the lamp board from the back. here,
The lamp board and the backboard are detachable from the frame. Therefore, since the lamp board can be removed with the back board attached, it is possible to prevent the general user from accidentally touching the electric unit portion and the adjustment portion even when the lamp is replaced.

According to a second aspect of the present invention, there is provided an electronic blackboard including a lamp for irradiating a writing screen and a reflector for reflecting light from the lamp so as to impinge on the screen. An engagement holding portion that is rotatably attached to a fixed member to a reflection position surrounding the periphery of the lamp and an open position that opens around the lamp around the lamp, and engages and holds the reflection plate that has been rotated to the reflection position. Is provided on the reflection plate and the fixing member to allow the reflection plate to rotate to a position where the engagement holding portion is engaged and to press the reflection plate in a direction to maintain the engagement. The member was attached to the fixed member. Therefore, the operation of rotating the reflection plate to the open position and the operation of rotating the reflection plate to the reflection position to fix the reflection plate can be performed by simply turning the reflection plate by hand without using a tool. For this reason, the replacement of the lamp performed while the reflector is rotated to the open position,
Even ordinary users can easily do this without any hassle.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described.
A description will be given based on FIGS. 1 to 7. Note that the same portions as those shown in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. First, as shown in FIG. 2, a frame 3 surrounding four sides of a writing screen 2, a rail member 5 attached to the back side of the frame 3, and a light shielding fixed to the frame 3 and extending vertically. An electronic blackboard includes a plate 13 (shown in FIG. 3), an intermediate member 14 attached to the light shielding plate 13, and a back board 15 and a lamp board 16 attached to the rail member 5 with the intermediate member 14 interposed therebetween. Housing 17
Is configured.

FIG. 3 shows a state where the rail member 5, the back board 15 and the lamp board 16 are removed from the state shown in FIG. The light shielding plate 13 in the frame 3
The fluorescent lamp 9 and the mirror 18
(Shown in FIG. 6), and a lens (not shown), a reading unit 19 such as a CCD, and an electric unit 20 are provided on the other side. Thereafter, the fluorescent lamp 9 is sandwiched between the intermediate members 14.
The one with is called the lamp side, and the one without the fluorescent lamp 9 is called the lens side because there is a lens.

As shown in FIG. 4, the light shielding plate 13 has a slit 21 and a bent portion 22. The intermediate member 14 is
A hooking portion 23, a positioning portion 24, a lens-side groove 25,
And a lamp-side groove 26. The bent portion 22 of the light shielding plate 13 is inserted into the hooking portion 23 of the intermediate member 14, and the slit 21
The surface on which is formed abuts on the positioning portion 24. The back board 15 is fitted in the lens groove 25, and the lamp board 16 is fitted in the lamp groove 26. In addition,
The light shielding plate 13 blocks unnecessary light other than the light reflected by the screen 2 out of the light emitted from the fluorescent lamp 9.

Further, since the back board 15 and the lamp board 16 are surrounded by the rail member 5 having the same S-shaped cross section as before, the housing 17 has a hermeticity.

Of the four rails constituting the rail member 5, the upper rail 5a and the lower rail 5b are fixed to the frame 3, and the lens side rail 5c is fixed by screws 6. Further, the intermediate member 14 is fixed to the light shielding plate 13. Therefore, a tool must be used to remove the backboard 15.

On the other hand, the lamp side rail 5d is
The frame 7 is fixed to the frame 3. The decorative screw 27 is a screw that has a portion to be pinched by a finger and can be turned without using a tool. Therefore, the lamp board 16
Can be removed without tools.

As described above, by fixing the lens-side rail 5c and the lamp-side rail 5d differently,
The lamp board 16 is shown as a member that can be easily removed by a general user, and the backboard 15 is shown as a member that must not be removed by a general user.

Next, the fluorescent lamp 9 is attached to an end portion in the frame 3 so as to be arranged vertically in parallel with the lamp side rail 5d. On upper and lower portions of the frame 3 as a fixing member, which extend in the horizontal direction, there are provided reflectors 28 which face the upper and lower ends of the fluorescent lamp 9 and reflect light from the fluorescent lamp 9 toward the screen 2. Installed. The reflecting plate 28 is bent at a right angle to form a substantially L-shape.
Further, bent portions 28a and 28b for attaching the reflection plate 28 to the frame 3 are formed. One of the bent portions 28a is attached to the frame 3 with the rivet 11 serving as a pivot point, and the reflecting plate 28 has the rivet 11 as a fulcrum and a reflection position (a position indicated by a solid line in FIG. 6) surrounding the fluorescent lamp 9. It becomes rotatable to an open position (a position shown by a two-dot chain line in FIG. 6) for opening the periphery of the fluorescent lamp 9.

The other bent portion 28b is formed with a projection 29 as an engagement holding portion. Further, the frame 3 has an engagement hole 30 as an engagement holding portion in which the projection 29 is engaged and held when the reflection plate 28 is rotated to the reflection position.
Are formed. Further, the frame 3 allows the reflection plate 28 to rotate to a position (reflection position) for engaging the projection 29 with the engagement hole 30 and to maintain the engagement. A leaf spring 31 which is a pressing member for pressing is mounted. The protrusion 29
As for the engagement hole 30, the projection 29 may be formed on the frame 3, and the engagement hole 30 may be formed on the bent portion 28 b.

In such a configuration, to read an image on the screen 2, first, the screen 2 is irradiated with light from a fluorescent lamp 9, and the light reflected on the screen 2 is
The light is further reflected by the mirror 18 and directed toward the position where the lens is provided. Then, the light reduced by the lens is read by a reading unit 19 such as a CCD.

To replace the fluorescent lamp 9, first,
The cosmetic screw 27 is pinched with a finger, turned, and removed. Next, the lamp-side rail 5d is removed from the frame 3. Next, the lamp board 16 is removed by sliding on the upper rail 5a and the lower rail 5b to obtain the state shown in FIG.

Thereafter, the reflecting plate 28, which has been turned to the reflecting position as shown by the solid line in FIGS. 5 and 6, is turned to the open position shown by the two-dot chain line in FIG. Replace with The operation of rotating the reflection plate 28 to the open position may be performed by manually rotating the reflection plate 28, and does not require a tool.

Here, when the lamp board 16 is removed, the lens side is surrounded by the back board 15 and the light shielding plate 13 to which the intermediate member 14 is attached. Therefore,
Since the electric unit and the adjustment unit are not accidentally touched by the hand during the operation, the general user can replace the fluorescent lamp 9. After replacing the fluorescent lamp 9, the reflecting plate 28 is manually operated to rotate to the reflecting position. Reflector 2
8 is rotated to the reflection position when the projection 29 and the engagement hole 30 are rotated.
Can be engaged and held at the reflection position, and the leaf spring 31 is oriented such that the projections 29 and the engagement holes 30 are kept engaged. In order to press the reflection plate 28, the reflection plate 28 is fixed at the reflection position.

After the replacement of the fluorescent lamp 9 is completed, the reflecting plate 28 is rotated to the reflecting position, and then the lamp board 16 is attached by sliding it on the upper rail 5a and the lower rail 5b. Into the groove 26 on the lamp side.
Next, the lamp-side rail 5 d is attached to the frame 3 such that the rail matches the end of the lamp board 16, and is fixed with a decorative screw 27.

In implementation, if at least a part of the lamp board 16 is made translucent, it is possible to determine whether the fluorescent lamp 9 is on and whether the light quantity is reduced. It can be seen that the time for replacing the fluorescent lamp 9 has come.

As a specific method for providing the light-transmitting property, for example, it is conceivable that the lamp board 16 is formed of a light-transmitting material such as a dark gray plastic plate. In this case, the translucency is kept to a necessary minimum so as not to cause disturbance due to external light. Further, from the viewpoint of appearance, it is desirable that the backboard 15 is formed of the same material.

As another method, for example, it is conceivable to provide a small hole in a part of the lamp board 16 formed of a non-translucent material. In this case, a cover or the like is provided to prevent dust and external light from entering the inside of the housing 1.

Even if the fluorescent lamp 9 does not have a light-transmitting property, it may be determined that a replacement time for the fluorescent lamp 9 has come by providing an optical sensor or the like.

In this embodiment, the reflection plate 28 bent at a right angle and formed in a substantially L-shape has been described as an example. However, the reflection plate 28 may be formed in a curved shape. Further, in the present embodiment, the case where the reflector 28 is provided separately on the upper and lower sides has been described as an example, but the shape of the reflector may be an integrated structure that is continuous from the upper part to the lower part. .

[0039]

According to the first aspect of the present invention, a reduction optical system including a lamp for irradiating a writing screen with light and a lens for reducing reflected light from the screen has a frame and a reduction optical system other than the lamp. The lamp board covers the lamp from the back, and the lamp board covers the part not covered by the lamp board from the back, and the lamp board and the back board are Because it can be attached to and detached from the frame, the lamp board can be removed while the backboard is fixed, and it is possible to prevent accidental touching of the electric unit and adjustment parts during work such as lamp replacement etc. Lamp replacement can be tolerated.

According to the second aspect of the present invention, the reflecting plate is rotatably mounted on the fixing member between the reflecting position surrounding the lamp around the rotation fulcrum and the opening position opening the periphery of the lamp, and is turned to the reflecting position. An engagement holding portion for engaging and holding the moved reflection plate is provided on the reflection plate and the fixing member, and the reflection plate is allowed to rotate to a position where the engagement holding portion is engaged, and the engagement is maintained. Since the pressing member that presses the reflecting plate in the direction is attached to the fixing member, the operation of turning the reflecting plate to the open position and the operation of turning the reflecting plate to the reflecting position and fixing can be performed without using a tool. It can be done simply by turning the reflector in the direction of rotation by hand, which makes it easy for ordinary users to replace the lamp with the reflector turned to the open position without any hassle. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state in which a lamp board according to an embodiment of the present invention is removed.

FIG. 2 is a perspective view showing a state where the lamp board is attached.

FIG. 3 is a perspective view showing the internal structure.

FIG. 4 is a cross-sectional plan view showing how to attach the intermediate member and the light shielding plate.

FIG. 5 is a perspective view showing a mounting state of a reflection plate.

FIG. 6 is a plan view showing a mounting state of a reflection plate.

FIG. 7 is a longitudinal sectional front view showing a state in which a projection and an engagement hole are engaged and pressed by a leaf spring.

FIG. 8 is a perspective view showing a front side of a conventional electronic blackboard.

FIG. 9A is a perspective view showing the back side, and FIG. 9B is a vertical sectional side view showing a mounting structure of the backboard.

FIG. 10 is a perspective view showing a mounting structure of a reflection plate.

[Explanation of symbols]

 Reference Signs List 2 screen 3 frame, fixing member 9 lamp 11 rotation fulcrum 15 backboard 16 lamp board 17 electronic blackboard housing 28 reflecting plate 29, 30 engagement holding unit 31 pressing member

Claims (2)

[Claims] 1. A reduction optical system for irradiating a writing screen with a lamp by a lamp and reducing the reflected light from the screen with a lens so that the lamp and at least a part of the reduction optical system other than the lamp are separated. A lamp board detachably supported by the frame and covering the lamp from the back, and a backboard detachably supported by the frame and covering the portion not covered by the lamp board from the back. A housing for an electronic blackboard, comprising: 2. An electronic blackboard comprising: a lamp for irradiating a writing screen; and a reflector for reflecting light from the lamp so as to impinge on the screen. A reflection position surrounding the periphery of the lamp and an open position for opening the periphery of the lamp are rotatably attached to the fixing member, and an engagement holding portion for engaging and holding the reflection plate turned to the reflection position is provided with the reflection plate. A pressing member provided on the fixing member, the pressing member pressing the reflection plate in a direction to maintain the engagement while allowing the reflection plate to rotate to a position where the engagement holding portion is engaged with the fixing member. An electronic blackboard characterized by being attached to the electronic blackboard.