CN104330949B - Teaching board book projector mechanism - Google Patents

Abstract

The invention discloses a blackboard projection mechanism for teaching, which comprises a blackboard projection board (1), a background mechanism and a projector (2). The background mechanism is located at the rear side of the blackboard projection board (1) and is close to it. The blackboard projection board (1) is made of transparent material, and the background mechanism includes a black movable background board (3), a white movable background board (4) and a black fixed background board arranged in sequence at the rear side of the blackboard projection board (5), the white movable background board (4) and the black movable background board (3) have equal areas, and both can move left and right under the drive of the power mechanism. The invention can increase the effective writing area, can change the position of the white movable background board, enables people from different angles to see the projected content clearly, and can realize the switching of projection and projection state.

Description

Blackboard projection mechanism for teaching

technical field

The invention relates to the field of teaching tools, in particular to a blackboard projection mechanism for teaching.

Background technique

The blackboard used for teaching blackboard writing is indispensable in the classroom. For modern teaching, multimedia projection is naturally indispensable. Many classrooms use teaching equipment combining blackboards and projection screens, which not only meet the needs of teachers for blackboard writing, but also use projection equipment for projection teaching. In the prior art, the projection equipment includes a projector and a projection screen. The projection screen and the blackboard are generally installed on the wall in front of the classroom. However, due to the limited area of the wall, the projection screen and the blackboard often overlap. Therefore, there are following technical problems in the blackboard projection equipment of the prior art:

1. The overlapping part of the projection screen and the blackboard will cover part of the blackboard, and some projection screens even cover almost half of the blackboard, which greatly reduces the effective writing area of the blackboard;

2. The installation position of the projection screen in the prior art is fixed. If the projection screen is set on the left side of the classroom, the students on the right side will be affected. Similarly, if the projection screen is set on the right side of the classroom, the students on the left side will be affected. will be affected to a certain extent. If the projection screen is set in the middle of the classroom, it will not only affect the viewing of students on both sides, but also affect the teacher's writing on the blackboard;

3. In order to increase the effective writing area of the blackboard, it is necessary to turn off the projector in the middle of the class, raise the projection screen, and then lower the projection again, which is not only troublesome, but also a waste of class time;

4. After writing on the entire blackboard, if you need the assistance of a multimedia projector, the projection screen will cover part of the chalk writing on the blackboard at this time, causing some inconvenience. If you want to use these chalk writing again, you need to turn off the projector. The projection screen rises.

Contents of the invention

In view of this, the present invention provides a blackboard writing projection mechanism for teaching with large effective writing area and adjustable projection position, aiming at the problems in the prior art that the blackboard overlaps with the projection screen to reduce the effective writing area.

The technical solution of the present invention is to provide a blackboard projection mechanism for teaching with the following structure, including a blackboard projection board, a background mechanism and a projector, the background mechanism is located at the rear side of the blackboard projection board and is close to it, the The blackboard projection board is made of transparent material, and the background mechanism includes a black movable background board, a white movable background board and a black fixed background board arranged successively on the rear side of the blackboard projection board, and the white movable background board and The area of the black movable background board is equal, and the two can move left and right under the drive of the power mechanism;

When projecting, the white movable background board and the black movable background board are misaligned with each other, and the image of the projector is projected on the white movable background board behind the blackboard projection board; when not projecting, the black movable background board is located on the white movable background board directly in front of.

With the above structure, compared with the prior art, the present invention has the following advantages: by adopting the present invention, since the background mechanism is close to the blackboard writing projection board made of transparent material, the black background board is fixed as the background of the writing on the blackboard when it is used. The black background of the blackboard in the corresponding area of the projection board allows the listeners to see the contents of the blackboard clearly. The white movable background board is used as the projection background, and when projected onto this area, the projected content can be clearly displayed. The movable background board is moved to the front of the white movable background board to block its white background, so that the whole product can be used for blackboard writing. The invention can increase the effective writing area, can change the position of the white movable background board, enables people from different angles to see the projected content clearly, and can realize the switching of projection and projection state.

Preferably, the power mechanism includes a first screw motor and a second screw motor, the first screw motor is connected to the first screw, and the white movable background plate is installed on the first screw and can move along the first screw under the drive of the first screw motor; the second screw motor is connected with the second screw, and the black movable background plate is installed on the second screw and It can move along the second screw mandrel driven by the second screw mandrel motor. Through the screw mechanism to drive the background plate to move, the transformation of the projection position and the convenient switching of the projection state are realized.

As a preference, the projector is installed on the sliding guide rail. When adjusting the projection position, the first screw motor drives the white movable background plate to move, and at the same time, the projector slides on the sliding guide rail to keep the projection of the projector on the white movable background plate. The background plate and the white removable background plate and the black removable background plate are misaligned. It is convenient to adjust the projection position as needed.

As a preference, a photosensitive element is provided on the white movable background plate, a laser source matched with the photosensitive element is provided on the projector, and the photosensitive element is connected with the first screw motor and the second screw respectively. motor connection. When adjusting the projection position, the projector slides along the sliding guide rail, the laser source touches the photosensitive element, and the photosensitive element controls the movement of the screw motor, and always keeps the laser source aligned with the photosensitive element, thus keeping the projector projected on the white movable background board. At the same time, it is misplaced with the black removable background plate.

Preferably, a lens cover is provided on the projection lens of the projector, and when the projection is paused or terminated, the lens cover is used to block the projection lens, the laser source touches the photosensitive element, and the second screw motor is controlled by the photosensitive element to move to the white movable background directly in front of the board. In this way, the annoyance of retracting and placing the projection screen in the prior art is avoided, and the original projection area becomes an area where blackboard writing can be written, effectively utilizing the writing area of the blackboard projection board.

As preferably, when starting to project or continuing to project, open the lens cover, touch the photosensitive element by the laser source, the photosensitive element controls the first screw motor and the second screw motor, so that the white movable background plate and the black movable background plate are aligned. Misplaced, the projector projects on a white movable background board. It is convenient to switch between suspending projection and continuing projection.

Preferably, the transparent material used to make the blackboard projection board can realize diffuse reflection of light. So that audiences from different angles can see clearly the contents of the writing on the blackboard and the projection.

Description of drawings

Fig. 1 is a structural representation (first state) of the present invention;

Fig. 2 is a structural representation (second state) of the present invention;

Fig. 3 is a structural schematic diagram of a projector and a sliding guide rail;

As shown in the figure, 1. Blackboard projection board, 2. Projector, 2.1. Projection lens, 2.2. Lens cover, 3. Black movable background board, 3.1, second screw rod, 4. White movable background board, 4.1 , the first screw rod, 5, the black fixed background plate, 6, the photosensitive element, 7, the laser source, 8, the sliding guide rail.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the present invention is not limited to these embodiments.

The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, for the sake of illustration, the drawings of the present invention are not completely drawn according to the actual scale, and are described here.

As shown in Figures 1, 2 and 3, a blackboard projection mechanism for teaching of the present invention includes a blackboard projection board 1, a background mechanism and a projector 2, and the background mechanism is positioned at the rear side of the blackboard projection board 1 and is opposite to it. Closely, the blackboard projection board 1 is made of transparent material, and the background mechanism includes a black movable background board 3, a white movable background board 4 and a black fixed background board 5 arranged in sequence on the rear side of the blackboard projection board. The white movable background plate 4 and the black movable background plate 3 have equal areas, and both can move left and right under the drive of the power mechanism;

When projecting, the white movable background board 4 and the black movable background board 3 are misplaced mutually, and the image of the projector is projected on the white movable background board 4 behind the blackboard projection board; when not projecting, the black movable background board 3 is positioned on the white The front of the movable background plate 4.

The size ratio of the black movable background board 3, the white movable background board 4 and the black fixed background board 5 is set as follows: the length of the black fixed background board 5 is the black movable background board 3 or the white movable background board 4 More than three times (but not limited to this ratio), that is, when the white movable background board 4 is in the middle, the black movable background board 3 just moves to its left or right side, and no blocking occurs during projection.

It should be noted that the "transparency" of "the blackboard writing projection board 1 is made of transparent material" is not absolutely transparent, including semi-transparent and other states. The transparency is set based on the requirement that the audience can see the characters clearly, for example, in After frosting, its transparency will be reduced, and the diffuse reflection after frosting can make the human eye see more clearly.

The power mechanism includes a first screw motor and a second screw motor, the first screw motor is connected to the first screw 4.1, and the white movable background plate 4 is installed on the first screw 4.1 and can move along the first screw 4.1 under the drive of the first screw motor; the second screw motor is connected with the second screw 3.1, and the black movable background plate 3 is installed on the second screw Rod 3.1 and can move along the second screw mandrel 3.1 under the drive of the second screw mandrel motor.

The projector 2 is installed on the sliding guide rail 8. When adjusting the projection position, the first screw motor drives the white movable background plate 4 to move, and the projector 2 slides on the sliding guide rail 8 to keep the projector 2 projected on the The white movable background board 4 and the white movable background board 4 and the black movable background board 3 are misplaced.

The white movable background plate 4 is provided with a photosensitive element 6, and the projector 2 is provided with a laser source 7 matched with the photosensitive element 6, and the described photosensitive element 6 is connected with the first screw motor and the second screw motor respectively. Two screw motor connections. When adjusting the projection position, the projector slides along the sliding guide rail, the laser source touches the photosensitive element, and the photosensitive element controls the movement of the screw motor, and always keeps the laser source aligned with the photosensitive element, thus keeping the projector projected on the white movable background board. At the same time, it is misplaced with the black removable background plate.

The projection lens 2.1 of the projector 2 is provided with a lens cover 2.2, and when the projection is suspended or terminated, the projection lens 2.1 is blocked by the lens cover 2.2, the laser source 7 touches the photosensitive element 6, and the second screw motor is controlled by the photosensitive element 6 to move To the front of the white removable background board 4.

When starting or continuing to project, open the lens cover 2.2, touch the photosensitive element 6 by the laser source 7, the photosensitive element 6 controls the first screw motor and the second screw motor, and makes the white movable background plate 4 and the black movable background The board 3 is misplaced, and the projector 2 projects on the white movable background board 4 .

The transparent material used to make the blackboard projection board 1 can realize diffuse reflection of light.

The present invention can adopt following specific implementation steps to carry out:

Through control, when projecting, the white movable background board is always synchronized with the projector, that is: no matter where the projector is on the track, the projection range of the projector corresponds to the position of the white movable background board;

When a projector is needed, in addition to aligning the projector with the white movable background board, it is also required that the black background board and the white background board be dislocated (by controlling the motors that drive the two screw rods, and the white movable background board and the black movable background board are required to be dislocated). The position of the moving background plate is determined by the limit switch and the number of turns of the stepping motor at any time)

When the projector needs to be turned off (it does not have a projection function at this time, but only has a blackboard (writing on blackboard) function), the lens cover moves to cover the projector lens. At this time, the black background board moves to the front of the white background board, so that the background behind the blackboard writing background board is all black, forming a blackboard.

Moreover, since the color of the white chalk characters on the blackboard projection board is white, which is consistent with the white background, the white chalk at any position on the blackboard projection board will not affect the projection effect, that is, it is not necessary to erase the white chalk in the projection area during projection After the projection disappears, the white chalk characters can continue to be used.

There are also other implementations for switching the projection state: add a controller, the motor that controls the lens cover, the first screw motor and the second screw motor are all connected to the controller, and when the projection is paused or ended, the lens is driven by the motor The cover blocks the projection lens, and the controller controls the first screw motor and the second screw motor at the same time, so that the black movable background board is located directly in front of the white movable background board; when starting or continuing to project, the controller controls the lens cover Move away, and control the first screw motor and the second screw motor at the same time, so that the black movable background board and the white movable background board are misplaced, and the projector is projected on the white movable background board, and the white movable background board Align the photosensitive element on the laser with the laser source. The difference of this embodiment is that when the projection state is switched, the laser source and the photosensitive element do not need to be controlled, but the linkage between the lens cover and the first screw motor and the second screw motor is directly controlled by the controller.

In addition, the lens cover can be controlled by a remote control, and the remote control is wirelessly connected to the motor driving the lens cover. The first screw motor and the second screw motor can also be wirelessly connected to the remote control to be controlled by the remote control.

"The lens cover blocks the projection lens" is only for the convenience of use in the classroom or teaching process, and does not turn off the power of the projector. After the end, the power of the projector needs to be turned off. It should be noted that, for the sake of clarity, the first screw motor and the second screw motor are omitted in FIGS. 1 and 2 , but those skilled in the art can understand related technologies. FIG. 1 is a schematic diagram of a projection state, and FIG. 2 is a schematic diagram of a non-projection state.

The present invention also has the advantage that the prior art does not have: the use of frosted glass or frosted plexiglass does not affect the writing effect of chalk in a wet state, so a wet towel can be used as a blackboard eraser, avoiding the damage of dust to the user's lungs .

The above is only an illustration of the preferred embodiments of the present invention, but should not be construed as a limitation on the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to vary. In a word, all kinds of changes made within the protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims (5)

1. a teaching board book projector mechanism, it is characterised in that: include writing on the blackboard projection plate (1), background mechanism and projection Instrument (2), described background mechanism is positioned at the rear side of writing on the blackboard projection plate (1) and presses close to its phase, described writing on the blackboard projection plate (1) Being made of clear material, described background mechanism includes that being sequentially arranged in the black on rear side of writing on the blackboard projection plate may move background board (3), the removable background board (4) of white and black fixed background plate (5), described white may move background board (4) and Black may move the area equation of background board (3), and the two can move left and right under the driving of actuating unit；

During projection, the removable background board (4) of white and black may move background board (3) mutual dislocation, the image of projector White after being projected on writing on the blackboard projection plate may move on background board (4)；When not projecting, black may move background board (3) It is positioned at the dead ahead of the removable background board (4) of white；

Described actuating unit includes the first lead screw motor and the second lead screw motor, the first described lead screw motor and the first screw mandrel (4.1) connecting, described white may move background board (4), and to be installed on the first screw mandrel (4.1) upper and can be electric at the first screw mandrel Move along the first screw mandrel (4.1) under the driving of machine；The second described spindle motor and the second screw mandrel (3.1) connect, described Black may move background board (3) to be installed on the second screw mandrel (3.1) upper and can be along second under the driving of the second lead screw motor Screw mandrel (3.1) is mobile；

Described white may move background board (4) and is provided with light-sensitive element (6), and described projector (2) is provided with photosensitive The lasing light emitter (7) that element (6) matches, described light-sensitive element (6) is electric with the first lead screw motor and the second screw mandrel respectively Machine connects.

Teaching board book projector mechanism the most according to claim 1, it is characterised in that: described projector (2) peace It is loaded on rail plate (8), when adjusting projected position, makes the first lead screw motor drive the removable background board (4) of white to move Dynamic, projector (2) is in the upper slip of rail plate (8) simultaneously, keeps projector (2) to be projected in the removable background of white Plate (4) is upper and removable background board (4) black of white may move background board (3) sequence.

Teaching board book projector mechanism the most according to claim 2, it is characterised in that: in the projection of projector (2) Camera lens (2.1) is provided with lens cap (2.2), when suspending projection or terminate projection, blocks projection lens with lens cap (2.2) (2.1), lasing light emitter (7) touches light-sensitive element (6), light-sensitive element (6) control the second lead screw motor and move to white The dead ahead of removable background board (4).

Teaching board book projector mechanism the most according to claim 3, it is characterised in that: starting projection or continuing to throw During shadow, opening lens cap (2.2), lasing light emitter (7) touch light-sensitive element (6), light-sensitive element (6) controls first Bar motor and the second lead screw motor, make the removable background board (4) of white may move background board (3) sequence with black, throw Shadow instrument (2) is projected on the removable background board (4) of white.

Teaching board book projector mechanism the most according to claim 1 and 2, it is characterised in that: make described writing on the blackboard and throw The transparent material of shadow plate (1) can realize the diffuse-reflectance of light.