JP2005217735A - Data presentation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a data presentation apparatus for improving a tactile sensation when the inclination of a support arm is changed so as to enhance the operability. <P>SOLUTION: The data presentation apparatus is formed by turnably fitting a support part (1) for supporting an imaging apparatus (20) or a projector (2) to a main body (50) via a turning mechanism (60). The turning mechanism includes: a cam (4A) provided to a main body side or a support part side and apart from a turning shaft by a prescribed distance rθ within a prescribed angular range around the turning shaft (R); a slide part (5) provided to the other and relatively sliding on the cam attended with the turning of the support part; and pressing means (6, 7, 4B) for pressing the slide part onto the cam with a prescribed pressing force, and let an angle between a line tying a gravity center (G) of the support part and the imaging apparatus or the projector supported thereby with the turning center and an orthogonal line of a stage (21) be θ, then the cam is formed at the prescribed distance D (rθ), rθ=a×sinθ+b, wherein a, b are constants. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a material presentation device that captures a material such as a document or a three-dimensional object and presents the image on a screen or the like using a monitor device or a projector device.

  In presentations such as conferences and exhibitions, documents and solid objects are placed on a flat stage so that many people can view the materials at the same time. A material presentation device is often used that takes a picture from above with a video camera and projects the image (video) onto a screen or the like via a monitor device or a projector device.

As an example, there is an image input device described in Patent Document 1.
Although this image input device does not include an illumination device, a support unit that supports a camera unit that captures an image of a document, a base that rotatably supports the support unit, and a space between the support unit and the base unit A plurality of support columns and hinge portions are connected to each other, and the camera portion can be held at an arbitrary position by rotating each hinge portion.

Moreover, there is a material presentation device described in Patent Document 2 as an example provided with a lighting device.
This material presentation device includes a main body having a material table on which materials are placed, a camera arm raised from the material table, and a camera unit supported at the tip thereof, and a pair of arms having a projector attached to the tip. This is a data presentation device that is launched from a stand and the arm is turned to change the position of the projector.
Japanese Patent Laid-Open No. 9-65057 JP 2002-94836 A

Incidentally, the image input device described in Patent Document 1 includes a friction generating mechanism in the hinge portion in order to arrange the camera portion at a predetermined position.
Specifically, the hinge portion includes a friction generating member such as a rotating plate, a sliding washer, and a fixed washer, and generates a frictional force that resists rotation by pressing in the direction of the rotating shaft while closely contacting them. This frictional force is used to hold and hold the column at a predetermined angle.
Then, the load is adjusted so as to allow the rotation against the frictional force when a force for rotating the column is applied by a hand or the like from the outside.

However, this structure has the following problems.
The torque required to stop and hold the support column varies depending on the position (angle) of the support column. Therefore, the feeling when moving the column is not good.

This will be specifically described.
The total weight including the support and the camera and other members supported by the support is W, the center of gravity is G, the distance from the center of gravity G to the center of rotation is L, and the angle at which the support is tilted from the vertical direction is θ. If the rotational torque applied to the moving center is T,
T = L · W · sin θ (1) (see FIG. 5).

  This is because, when θ = 0 ° where the column is upright, the torque T at which the column attempts to fall is 0 (zero). As this θ increases, the torque T increases and θ becomes 90 It means that the maximum Tmax = L · W at °.

In order to be able to hold the support column at any angle, it is necessary to generate a rotation stopping torque Ts equal to or greater than Tmax.
Accordingly, the torque Th applied by hand from the outside in order to change the angle of the column depends on the angle θ, and Th> Ts−T (3)
From this equation, it can be seen that when the column is in the vertical position, T is zero and Th is the maximum value, and when the column is in the horizontal position, T is the maximum and Th is the minimum value.

In this way, the force that must be applied to rotate the column differs depending on the angle of the column, so that the touch is not good and the operability in the presentation is impaired.
Of course, this also applies to the arm that supports the projector as described in Patent Document 2.
Therefore, the present invention is to provide a material presentation device that improves the operability by improving the feel when changing the tilt of the support arm.

In order to solve the above problems, the present invention has the following configuration as means.
That is, the invention according to claim 1 includes a main body (50) having a stage (21) on which a material is placed, an imaging device (20) for imaging the material placed on the stage (21), and the stage. A support unit (1) mounted on the main body (50) to support the projector (2) or the imaging device (20) that projects the material placed on (21); and the imaging device (20) In the material presentation device (100) provided with the output means (24A) for outputting the image signal of the image of the material imaged by
The support portion (1) is rotatably attached to the main body (50) by a rotation mechanism (60). The rotation mechanism (60) includes the main body (50) side and the support portion ( 1) a cam (4A) which is provided on either side and is spaced a predetermined distance D from the rotation axis (R) in a predetermined angle range around the rotation axis (R); and the main body (50). ) Side and the support part (1) side, the sliding part (5) which slides on the cam (4A) relatively with the rotation of the support part (1), and the slide Pressing means (6, 7, 4B) for pressing the moving part (5) against the cam (4A) with a constant pressing force, and the support part (1) and the projector that the support part (1) supports (2) or a line connecting the center of gravity (G) of the portion combined with the imaging device (20) and the rotation shaft (R) is the stay. (21) When the angle formed with the line orthogonal to (21) is θ, the distance D is D = a · sin θ + b (where a and b are constants), and the cam is formed. A presentation device (100).

  According to the present invention, the arm can be rotated with a constant force regardless of the angle of the arm, and the touch is extremely good and the operability is improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIGS.
FIG. 1 is a perspective view showing an embodiment of a material presentation device of the present invention,
FIG. 2 is a graph for explaining the main part shape in the embodiment of the material presentation device of the present invention,
FIG. 3 is an assembly diagram showing the main part in the embodiment of the material presentation device of the present invention,
FIG. 4 is a perspective view showing a main part in the embodiment of the material presentation device of the present invention.

FIG. 1 shows an external appearance of a material presentation device according to an embodiment.
FIG. 1 (A) is a perspective view of the material presentation device as viewed from diagonally forward and upward, and FIG. 1 (B) is a perspective view of the material presentation device as viewed from diagonally rear and upward.

  This material presentation device includes a plate-like stage 21 on which material is placed and an operation unit 22 on which a power switch, a zoom switch and the like are arranged, and an apparatus main body 50 in which an image processing unit 23 is stored, A pair of arms 1 that are attached to the apparatus main body 50 and that support the projector 2 at the front end and the rising angle with respect to the apparatus main body 50 is variable, and a rising angle with respect to the apparatus main body 50 that supports the CCD camera 20 at the front end and variable. Camera post 20A.

  Further, the apparatus main body 50 includes a chassis 3 (not shown in FIG. 1) serving as a base and a cover 3A that is an external component covering the chassis 3.

  An image of the material placed on the stage 21 is captured by the CCD camera 20 positioned above the image, and an arbitrary processing is applied to the captured image (video) by the image processing unit 23, and then output means 24A. Thus, a video signal is output from the video output 24.

On the other hand, the projector 2 projects the material so that a necessary amount of material image is incident on the CCD camera 20.
At that time, as described above, the arm 1 and the camera column 20A are rotatable so that the projection angle with respect to the material and the imaging position of the CCD camera 20 can be varied so that the optimum shooting can be performed. When these are rotated by hand so as to have a desired angle, they are held at that angle by the friction mechanism 60 provided at the rotation center.

This friction mechanism 60 has the characteristics of the present invention, and will be described in detail below.
The rising angle of the arm 1 and the camera column 20A is represented by an angle θ formed with respect to the line Y orthogonal to the stage 21.
Therefore, θ = 0 ° when the arm and the camera column 20A are upright, and θ = 90 ° when lying horizontally.
Further, the following description of the friction mechanism 60 will be described with respect to the rotating portion of the right arm 1 in FIG. 1B, but this can be used for the left arm 1 and the camera column 20 as well. is there.

FIG. 4 is a perspective view showing the friction mechanism, and is a view seen from an arrow S in FIG.
FIG. 3 is an assembly drawing.

  The friction mechanism 60 is integrally formed with the shaft portion 1B on the end side of the arm 1, a guide plate 10C that rotates integrally with the shaft portion 1B, and the guide plate being allowed to move in the radial direction. Holder 8 that pivots to the right, a friction generating portion 30 that is substantially housed in the holder, and first and second cams that stand on the chassis 3 and pivotally support the shaft portion 1B and slide the friction generating portion 30. The cam plate 4 is provided with 4A and 4B.

Each member will be described in detail.
In FIG. 3, the main body side end portion of the arm 1 that supports the projector 2 is a shaft portion 1 </ b> B that is bent so as to have a rotation axis R that is parallel to the stage 1.
The shaft portion 1B is formed with a flange 1C, and the flange 1C is provided with a pin 1Ca that protrudes in parallel with the shaft portion 1B.
Further, a male screw (threaded portion) 1D is formed on the distal end side of the shaft portion 1B.

The guide plate 10 has a substantially disc shape having a shaft hole 10A through which the shaft portion 1B is inserted, and has an arm portion 10D protruding in a radial direction from a part thereof.
The arm portion 10D is formed with a pin hole 10B that engages with the pin 1Ca of the flange 1C and a holder hole 10C that is a long hole with the radial direction as a major axis.

  The holder 8 is a member having a U-shaped cross section having a strip-shaped flat plate (bottom plate) 8B and a pair of side plates 8C raised up to both end surfaces on the short side, and is substantially at the center of the bottom plate 8B. The pin 8A protrudes in the direction opposite to the rising direction of the side plate 8C.

The cam plate 4 is erected on the chassis 3 so as to be a predetermined distance rθ from the shaft hole 4C that supports the shaft portion 1B and the center (rotation axis) R of the shaft hole 4C according to the rotation angle. A first cam 4A having an outward sliding surface formed, and an inwardly facing sliding surface formed from the first cam at a constant interval rf in the radial direction around the rotation axis R And a second cam 4B having the following.
Details of the first and second cam surfaces 4A and 4B and the distance rθ will be described later.

  The cam plate 4 has a recessed portion 4D that is recessed in a direction along the rotation axis R in a range of about 90 ° centering on the rotation axis R with the first and second cam surfaces 4A and 4B as wall surfaces. It is said that.

The friction generating unit 30 includes a friction shoe 5, a coil spring 6, and a spring base 7.
The friction shoe 5 abuts against the first cam 4A and is pressed against the first cam 4A by the repulsive force of the coil spring 6 to generate a predetermined static frictional force.
The spring base 7 supports the coil spring 6 and accommodates a ball 7A, which is a sphere, in a freely rotating manner with a part of its outer surface protruding.
The coil spring 6 is provided between the friction shoe 5 and the spring base 7.

  When the coil spring 6 has a free length L0, the distance 30L (the total length of the friction generating portion 30) from the tip of the friction shoe 5 to the tip of the ball 7A is larger than the interval rf of the recess 4D of the cam plate 4 described above. Is set to

Next, assembly of the friction mechanism 60 having the above-described configuration will be described with reference to FIG.
The shaft portion 1 </ b> B is inserted into the shaft hole 10 </ b> A of the guide plate 10 and further inserted into the shaft hole 4 </ b> C of the cam plate 4.
The friction generating part 30 is mounted in the recess 4D while the spring 6 is contracted. At this time, the friction shoe 5 is disposed so as to abut against the first cam 4A.
In this mounted state, the spring 6 is compressed, and the repulsive force biases the friction shoe 5 toward the first cam 4A and the ball 7A toward the second cam 4B.

Next, the friction generating part 30 is covered so as to cover the holder 8, and the pin 8 </ b> A of the holder 8 is engaged with the holder hole 10 </ b> C of the guide plate 10.
Then, while engaging the pin 1Ca of the flange 1C with the pin hole 10B of the guide plate 10, the nut 9 is screwed into the screw portion 1D which is the tip of the shaft portion 1B protruding from the back surface of the cam plate 4, and the shaft 1B Is integrated with the chassis 3 so as to be rotatable.
Assemble the friction mechanism as described above.

  In the configuration described above, when a force is applied by hand in the direction in which the arm 1 is rotated, this is applied to the friction generating unit 30 via the guide plate 10 and the guide plate 8 integrated with the shaft portion 1B in the rotating direction. A force is applied in a direction in which the is rotated about the rotation axis R.

At this time, since the ball 7A is rotatable, almost no frictional force is generated between the ball 7A and the second cam 4B, but a large stationary state is caused between the friction shoe 5 and the first cam 4A. A frictional force is generated.
Therefore, when a predetermined force against the frictional force is applied, the friction shoe 5 slides on the first cam 4A, and the arm 1 is allowed to rotate.

Next, the distance rθ from the rotation axis R to the first cam 4A will be described in detail.
The total weight including the arm 1 and the projector 2 supported by the arm 1 is W, the center of gravity is G, the distance from the center of gravity G to the rotation axis (center) R is L, and the angle at which the arm 1 is tilted from the vertical direction Is θ and the rotational torque applied to the rotation axis R is T, as described above, T = L · W · sin θ (1). (See FIG. 5).
Therefore, when the arm 1 stands upright at θ = 0 °, the torque T at which the arm 1 tries to fall is 0 (zero). As the θ increases, the torque T increases and θ is increased. At 90 °, the maximum Tmax = L · W.

  In this embodiment, in order to hold the arm 1 at any angle, the pressing load (spring constant of the spring 6) or friction is generated so as to generate the rotation stopping torque Ts equal to or greater than Tmax. Coefficients etc. are set.

  In the embodiment, in order to generate the rotation stopping torque Ts, the distance rf between the first and second cams 4A and 4B, the spring constant k and the free length L0 of the spring 6, the free length 30L of the friction generating portion 30, The sliding surface material M and the surface state SF of the friction shoe 5 and the first cam 4A are set.

Regardless of the angle of the arm 1, the operability is better when a slight resistance force is felt as a feeling when applying force to the arm 1, so this resistance torque is set as Tp.
Therefore, the minimum torque Tmin generated by the friction mechanism 60 is Tmin = Tp, and the torque Tθ to be generated by the friction mechanism 60 when the arm 1 is at an arbitrary angle θ is Tθ = T + Tp.

  Here, if the coefficient of static friction between the first cam 4A and the friction shoe 5 is μ, and the pressing force of the friction shoe 5 pressing the first cam 4A by the spring 6 is F, the first cam Since the distance rf between 4A and the second cam 4B is constant, the pressing force F is constant, and the frictional force Fr is Fr = μ · F.

Therefore, the distance rθ from the rotation axis R to the first cam 4A at an arbitrary angle θ of the arm 1 is
rθ = Tθ / Fr = Tθ / (μ · F) = (T + Tp) / (μ · F)
= (L · Wsinθ + Tp) / (μ · F) (2)
If the first cam 4A is formed with rθ represented by the equation (2), the force applied to rotate the arm 1 can be made constant regardless of the angle θ of the arm 1.
Therefore, the position of the support arm 1, that is, the projector 2 can be changed with a very good feeling at all times.
The relationship between rθ and θ described above is shown as a graph in FIG.

  In this equation (2), values other than θ can be set as constants. This means that the distance rθ from the rotation axis of the first cam 4A is formed as a linear function of sin θ. That is, rθ = a · sin θ + b (where a and b are constants) (3).

As described above, it goes without saying that the friction mechanism 60 can also be applied to the camera support 20 </ b> A that supports the camera 20.
In this case as well, according to the total weight W of the camera column 20A and the camera 20, the distance L from the center of gravity G to the rotation axis, or the resistance torque Tp that provides an optimal feel when the camera is repositioned, equation (2) If the first cam 4A is formed by setting each value so as to satisfy the condition, the camera column 20A can be rotated with a constant applied force regardless of the angular position of the camera column 20A, and the feel is extremely good. This material presentation device can be operated.

  The embodiment of the present invention is not limited to the configuration and procedure described above, and it goes without saying that modifications may be made without departing from the scope of the present invention.

For example, the cam formed by rθ in the equation (2) may be the second cam, and the friction shoe 5 may be brought into contact with the second cam.
The formation range of the first and second cams 4A and 4B is not limited to the above-described angular range (about 0 ° to about 90 °). It may be arbitrarily set according to the pivotable angle of the arm 1.
Further, the first and second cams 4A and 4B may be formed on the arm 1 side and rotated integrally with the arm 1, while the friction generating portion 30 may be provided on the chassis side. In any case, the first and second cams 4 </ b> A and 4 </ b> B and the friction generating unit 30 may be configured to slide relative to each other as the arm 1 rotates.

It is a perspective view which shows the Example of the material presentation apparatus of this invention. It is a graph for demonstrating the principal part shape in the Example of the data presentation apparatus of this invention. It is an assembly drawing which shows the principal part in the Example of the data presentation apparatus of this invention. It is a perspective view which shows the principal part in the Example of the data presentation apparatus of this invention. It is a figure explaining the torque at the time of an arm rotating.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Arm 1B Shaft 1C Flange 1D Thread part 2 Projector 3 Chassis 4 Cam plate 4A 1st cam 4B 2nd cam 4C Shaft hole 5 Friction shoe 6 Spring 7 Spring base 7A Ball 8 Holder 8A Pin 9 Nut 10 Guide plate 10A Shaft Hole 10B Pin hole 10C Holder hole 10D Arm part 20 CCD camera 21 Stage 22 Operation part 23 Image processing part 24 Video output 24A Output means 30 Friction generating part 30L Free length of friction generating part 50 Device body 60 Friction mechanism (rotation) mechanism)
100 Material presentation device rf (cam part) interval rθ distance

Claims (1)

A main body having a stage for placing materials;
An imaging device for imaging the material placed on the stage;
A support unit attached to the main body for supporting the projector or the imaging device that projects the material placed on the stage;
In the material presentation device provided with output means for outputting an image signal of the image of the material imaged by the imaging device,
The support portion is configured to be pivotally attached to the main body by a pivot mechanism,
The rotation mechanism is
A cam that is provided on either the main body side or the support portion side and that is separated from the rotation axis by a predetermined distance D in a predetermined angle range around the rotation axis;
A sliding portion that is provided on the other of the main body side and the rotation support portion side and relatively slides the cam as the support portion rotates;
Pressing means for pressing the sliding portion against the cam with a constant pressing force;
When the angle formed by the line connecting the center of gravity of the portion where the support unit and the projector or the imaging device supported by the support unit are combined with the rotation axis is a line perpendicular to the stage is θ ,
The distance D is
D = a · sin θ + b (where a and b are constants)
A material presentation device characterized in that the cam is formed as follows.