JPH059716Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a projector such as a physical projector that directly projects an object to be projected, such as a manuscript or a book, onto a screen.

[Conventional technology]

Conventionally, devices that project originals onto a screen include
There is an OHP (Overhead Projector).
However, OHP cannot be used unless the original is made of translucent synthetic resin film, so the original must be copied onto the film using a copying machine or written directly onto the film.

Therefore, a physical projector was developed that projected the original as it was on paper onto a screen. This actual projector irradiates a document set on a platen glass of a document table (projection table) with strong light from a halogen lamp, and then focuses the reflected light with a lens and projects it onto a screen.

In this real projector, a cover is provided on the document table, and turning on and off of the light source is controlled by detecting opening and closing operations of the cover. That is, when the cover is closed, the light source is turned on to set the projection state, and when the cover is opened, the light source is turned off so that the document is not dazzled when viewed.

[The problem that the idea aims to solve]

However, while the platen glass of the document table is generally rectangular (A4 size), the shape of the screen is often close to a square, so if the loading surface and the screen are different in shape, the document may protrude from the screen. Put it away.

Therefore, when attempting to manually move the document set on the platen glass and project the portion of the document that protrudes from the screen onto the screen, the document cover must be opened each time. For this reason, in order to view the part that protrudes from the screen without opening the document cover, the projector is equipped with a rotating mechanism, and the projector is rotated (tilted) vertically so that the part that protrudes into the screen. I have to.

However, since the positional relationship between the projector and the screen changes, image distortion (deformation) increases and refocusing becomes necessary.

Therefore, the present invention was devised to project the portion that protrudes from the screen by moving the document table.

By the way, for copying machines, for example, Japanese Patent Application Laid-Open No. 50-62039
There are some types, such as the one in Japanese Patent Publication No. 1, in which the original platen moves to copy the original.

The movable document table of this copying machine must be moved from one end of the document to the other with respect to the slit-shaped image input opening, and the moving distance is long and the amount of protrusion from the main body is large. For this reason, it is easy to interfere with the surroundings and must be installed with sufficient space around it. Furthermore, since the amount of protrusion is large, when an external force is applied to the end of the document table, the movable portion of the document table is likely to be damaged.

Furthermore, the movable document table of a copying machine is driven at a constant speed by a motor because the copied image will be distorted unless it is moved at a constant speed. Furthermore, the document table must be moved from one end of the document to the other, and cannot be stopped midway.

Furthermore, the movable document table of the copying machine is adapted to move to one side from a reference position.

Furthermore, the screen is provided at a position higher than a predetermined height from the floor (for example, higher than the height of a desk) so that many people can easily view the screen.

On the other hand, projectors are often placed on a desk, and are generally set at the height of the desk. For this reason, the image projected on the screen tends to protrude to the bottom.

[Purpose of invention]

This idea allows images that protrude from the screen in the vertical direction to enter the screen, without increasing image distortion, eliminating the need to refocus, and moving the projection table such as the document table. To provide a projector with excellent operability that can project over a wide range an object set on a setting surface even if the amount is small.

[Means to solve the problem]

In order to achieve the above purpose, this invention did not simply convert the movable document table of a copying machine into a projector, but also provided a set surface on which the object to be projected was placed, and a screen that was placed on this set surface. A cover that can be opened and closed covers the projection object placed on the set surface, and when the projection object placed on the set surface is irradiated with light from below, the light source and the reflected light image of the projection object irradiated with light by the light source are reflected by the light source. A projector comprising a reflecting means for reflecting light along a set surface and a lens for projecting reflected light from the reflecting means onto a screen in front of the projector, which accommodates the light source, the reflecting means, and the lens, and is arranged along the set surface. a case having a projection aperture on opposing surfaces for regulating the irradiation range of the light source in the direction of the set surface, the set surface and the cover, and reciprocates back and forth with respect to the screen along the projection aperture; A projection table that is movable and covers the projection aperture, and an amount of movement of the projection table in the forward direction from a reference position where the set surface and the projection aperture face each other is larger than an amount of movement in the backward direction; and a movement range regulating means for regulating the movement of the end of the platform inward from the edge of the projection aperture.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

<Configuration> First, the configuration will be explained.

As shown in FIG. 14, the real projector 1 of this embodiment is set on a desk 121 with a height of H, and the first
As shown in the figure, light from a pair of left and right light source units 3L and 3R provided in a case 14 of a main body 13 is irradiated onto an object to be projected, for example, an original, on an original platen 15, which will be described later, and the reflected light from this object is reflected by a reflecting means. For example, the light is guided to a lens unit 7 by a mirror 5, and the projection surface is curved or projected onto a screen 9.

Incidentally, on the back side of the case 14, cooling devices such as fan units 11L and 11R equipped with cooling fans are provided.
is provided. These fan units 11
The outside of L and 11R is covered with a mesh 12 made of aluminum, for example.

The light source units 3L and 3R are halogen lamps 7.
5 and 5 glasses 77 for heat dissipation. Note that a mercury lamp or the like may be used as the light source.

The lens unit 7 uses, for example, a plurality of aspherical lenses, and the focus is adjusted by turning the flange 7F left and right.

The screen 9 is attached to a support 122 as shown in FIG.
This is a high-brightness linearly curved screen supported at a height of h by the screen, and is curved inward in the vertical direction. This screen 9 is, for example, shown in FIG.
A specular reflective surface 103 is formed on the surface of the substrate 101 as shown in FIG.
A transparent layer body 105 that allows light to pass through is formed thereon. This transparent layer body 105 has an image plane 107.
An irregular uneven striped pattern curved in a vertically continuous waveform, that is, an undulating pattern of concave portions 109 and convex portions 111 is formed on the surface where the concave portions 109 and convex portions 11
A large number of grooves 113 for refracting and diffusing incident light on the surface of 1 are provided along the longitudinal direction of the uneven pattern to create a substantially rough surface, thereby producing fine transparent or translucent unevenness. The light passing through the transparent layer body 105 is diffused only within an appropriate angle, and a bright image is focused on the surface within the required angle.

By the way, as the transparent layer 105, a synthetic resin sheet or film, such as a transparent or translucent thermoplastic or thermosetting synthetic resin sheet such as vinyl chloride, polyethylene, or polypropylene, is used.

Note that the screen is not a special one, and may be made of cloth, synthetic resin, or a wall.

As shown in FIG. 2, the real projector 1 has a projection device on the top that can be manually moved back and forth with respect to the screen 9 (in a direction along the vertically long irregular uneven striped pattern formed on the screen 9). For example, the manuscript table 15
It is equipped with

A document cover 19 made of, for example, rubber and having a grip 17 is attached to the document table 15 by a hinge 21 so as to be openable and closable.

Note that if the document cover 19 is not required due to the shape of the object to be projected, the document cover 1 can be removed from the main body 13.
9 can be removed.

On both sides of the case 14, there are handles 23 for gripping when carrying the case, and heat dissipating members such as iron heat dissipating plates 25 having a plurality of heat dissipating holes 24 as shown in FIG.
A grid-like member such as a mesh 26 made of aluminum (which has higher thermal conductivity than iron) is provided to cover the heat sink 25. Note that the net 26 may be made of other metals such as iron or copper.

Further, the heat sink 25 and the net 26 are integrated and can be opened and closed about a shaft 89, thereby making it possible to replace the lamps 75 of the light source units 3L and 3R. Furthermore, the heat sink 25 and the net 26 are attached to the case 14 with a spacer 9.
0 through screws 91. As the spacer 90, a rubber plate, a sponge,
Rubber magnets etc. can be used.

Note that the heat sink 25 has a plurality of inclined louvers 93 forming the heat sink holes 24, and the louvers 93 are overlapped in the horizontal direction so that the light from the light source hardly leaks outside.

Furthermore, as shown in FIG. 2, on the front of the case 14,
A plurality of louvers 95 are provided.

As shown in FIG. 3, on the back of the case 14, in addition to the fan units 11L and 11R, there are a power cord 27, a breaker 29, a lighting mode changeover switch 31, a continuous lighting switch 32, and a power switch 3.
3. A lamp disconnection display panel 35 is provided.

The lighting mode changeover switch 31 is connected to the cover 1.
9 is used to switch between a mode in which the lamp 75 is turned off (extinguished mode) and a mode in which the lamp 75 is darkened (dark mode).

Therefore, when using the real projector 1 in a bright surrounding, the lamp 75 is turned on when the cover 19 is opened.
Even when the lamp 75 is turned off, it is easy to see the projected object, so switch to the off mode and use it in dark surroundings. When the cover 19 is opened, it is difficult to see the projected object if the lamp 75 is turned off, so switch to the dark mode. Switch and use.

The continuous lighting switch 32 is used to turn on the halogen lamp 75 continuously when the document cover 19 cannot be closed due to the size or thickness of the object to be projected.

On the bottom of the main body 13, as shown in Fig. 4, there are rubber feet 37 at the four corners and an adjuster 39 for adjusting the height back and forth.
is provided.

The upper frame 13F of the main body 13 is provided with a projection opening 4 that guides the light from the light source units 3L and 3R to the original set on the original platen 19, as shown in FIGS. 4 and 5.
1, left and right rail guides 43L and 43R that guide the document table 15 so as to be movable in the front and rear directions, a rectangular hole 42 necessary for the push button 53 described later to operate over the entire movement area, and the document table. A detector for detecting the opening/closing of the cover 19 of 15, for example, a limit switch 44; a transmission plate 45 that operates the limit switch 44 over the entire moving area of the document table 15 in succession to the opening/closing operation of the cover 19; Directional movement range regulating means such as stoppers 47F and 47R are provided.

The limit switch 44 switches the connection of the light source units 3L and 3R during projection and when the cover 19 is opened, and changes the voltage applied to one halogen lamp 75 to turn the halogen lamp 75 on or off. A circuit shown in FIG. 8, which will be described later, is connected to the circuit, which allows brightness and darkness to be set without any interference.

The cover 1 is placed on the document table 15 as shown in FIG.
In addition to 9, there is a projection opening 49, a setting surface that covers the projection opening 49 and on which the original is set, such as a platen glass 51, a push button 53 that transmits the opening/closing operation of the cover 19 to the transmission plate 45, and stoppers 47F and 47R to control the movement range. A stopper 55 that restricts the movement of the rails, and bearing guides 57L and 57R that engage with the rail guides 43L and 43R via bearings, respectively, are provided.

Although the projection aperture 49 is smaller than the projection aperture 41, it may be larger or the same.

When the positional relationship between the main body 13 and the document table 15 is in the state shown in FIG. 4 (the position where the platen glass 51 and the projection aperture 41 face each other) (reference position), the stopper 55 closes the stopper 47F as shown in FIG. distance L from
1. It is located at a distance L2 from the stopper 47R, and the amount of movement of the document table 15 from the reference position is such that the forward distance L1 is greater than the backward distance L2.

Note that the forward distance L1 of the document table 15 is the backward distance L2.
Since it is larger, the back opening of the document table 15 can be seen from the tip of the main body 13 when moving forward. For this reason, main body 1
A shutter (not shown) that expands and contracts as the document table 15 moves is provided between the tip of the document table 15 and the tip of the opening on the back surface of the document table 15.

The limit switch 44 is connected to the lever 4 via the support member 59 on the upper frame 13F as shown in FIG.
It is installed with 4L facing upward. Further, the transmission plate 45 is rotatably attached to a support member 61 attached to the upper frame 13F about a shaft 63. Note that the spring 65 always urges the upper frame 13F side.

The push button 53 has a contact portion 53A that contacts the cover 19 and a contact portion 53B that contacts the transmission plate 45, and is attached to a hole provided in the frame 15F of the document table 15 via a cylindrical support member 67 and a nut 69. It is being Note that the push button 53 is returned to its original position by the spring 71.

The main electric circuit is constructed as shown in FIG. Note that the circuit configuration of the lamp disconnection display panel 35 will be omitted.

Terminals 27A and 27 connected to power cord 27
There is a breaker 29, a power switch 3 between
3. The parallel circuits of the fan motors 81L and 81R of the fan units 11L and 11R are connected in series.

The power switch 33 also has a thermostat 83.
and a protective capacitor 85 are connected in parallel.

One terminal 33A of power switch 33 and terminal 2
7B, a limit switch 44 and a coil 87L of a relay 87 are connected in series.
The continuous lighting switch 32 is connected in parallel to the limit switch 44.

Note that the relay 87 includes a contacts 87A1, 87A2, and a b contact 87B.

Further, between the terminal 33A and the terminal 27B, a light source unit 3R, a b contact 87B of the relay 87, a lighting mode changeover switch 31, and a light source unit 3L are connected.
are connected in series.

Terminal 33A and one terminal 3 of light source unit 3L
L1 is connected to relay 87 via a contact 87A1.

One terminal 3R2 and terminal 2 of the light source unit 3R
7B is connected via an a contact 87A2 of the relay 87.

By the way, as a means for detecting the opening and closing of the document cover 19, a proximity switch 60 is used as shown in FIGS. Also good.

The proximity switch may be of a high frequency oscillation type, a differential coil type, a magnetic type, a capacitance type, etc., and may be selected and installed as appropriate.

<Operation> In such a configuration, this device operates as follows.

When the power switch 33 is turned on, the fan motors 81L and 81R shown in FIG. 8 rotate and start cooling the inside of the case 14.

When the original is set on the platen glass 51 and the cover 19 is closed with the lighting mode switch 31 turned off (lights off mode), the push button 53 shown in FIG. 7 is pressed and the transmission plate 45 is pressed.
Press down. This pushes the lever 44L and turns on the limit switch 44.

Therefore, the coil 87L of the relay 87 shown in FIG. 8 is excited, the a contacts 87A1 and 87A2 are closed, and the b contact 87B is opened.

As a result, the light source unit 3L,
3R are connected in parallel and in a projection state, and the light source units 3L and 3R emit strong light.

Halogen lamps 75 of light source units 3L and 3R
The light passes through the glass 77 and passes through the platen glass 51.
is irradiated and illuminates the original. The reflected light is reflected by the mirror 5 and projected onto the screen 9 through the lens unit 7.

At this time, the projection position is adjusted by the adjuster 39 shown in FIG. 4, and the focus is adjusted by turning the frame 7F of the lens unit 7.

If the projected image protrudes from the screen 9 due to the difference in the shape of the platen glass 51 and the screen 9, please move the original platen 15 as necessary.
Move back and forth from the reference position.

Therefore, the front end of the platen glass 51 moves back and forth with the front edge of the projection aperture 41 as a boundary, and the front end of the platen glass 51
The rear end moves back and forth with the rear edge of the projection aperture 41 as a boundary.

As a result, the image projected on the screen 9 moves up and down, so that the protruding portion comes to fit inside the screen 9.

The movement range of the document table 15 is limited to the stopper 47.
F, 47R and stopper 55.

When the cover 19 is opened, the limit switch 44 is turned off, the excitation of the coil 87L is released, and the a contact 87 is turned off.
A1 and 87A2 open, and b contact 87B closes.
As a result, the light source units 3L and 3R are turned off.

On the other hand, when the cover 19 is closed with the lighting mode changeover switch 31 turned on (dark mode), the light source units 3L and 3R are lit in parallel as described above, but when the cover 19 is opened, the light source units 3L and 3R are lit in parallel. 3R are connected in series, the voltage applied to one halogen lamp 75 decreases, and the brightness decreases and becomes dark.

Therefore, even if the cover 19 is opened, the lamps 75 do not go out, and the lamps 75 become dark while all of them are lit. Therefore, the platen glass 51 does not become completely dark, making it easier to see the document, and turning on the lamp 75.
The number of times the lamp is turned off is reduced, and the life of the lamp 75 is extended.

Also, when projecting, two sets of five lamps 75 are connected in series, these two sets are connected in parallel, and the cover 1 is turned on.
When the lamps 9 are opened, they are lit in series, so the amount of light from the lamps 75 can be adjusted without using a transformer.

If the object to be projected does not require the document cover 19, the continuous lighting switch 32 is turned on to keep the halogen lamp 75 on at all times.

When the power switch 33 is turned off at the end of projection, all the halogen lamps 75 are turned off, but while the inside of the projector 1 is hot, the thermostat 83 remains conductive, and the fan motors 81L and 81R do not rotate. Continuing, when the temperature inside the projector 1 decreases and the thermostat 83 loses conduction, the fan motor 8
1L and 81R stop.

<Effects of Examples> According to the examples described above, the following effects can be obtained.

(1) Rather than moving the document table 15 to one side from the reference position like the movable document table of a copying machine, the document table 15 is moved back and forth from the reference position with respect to the screen 9 along the projection opening 41 of the main body 13. Since the platen glass 51 and the screen 9 have different shapes and the projected image protrudes from the screen 9 in the vertical direction, the platen 15 is moved and the protruding part is moved to the screen 9.
It can be projected within. Therefore, unlike the conventional method, the projector 1 is not rotated vertically to view the protruding portion, so the positional relationship between the projector 1 and the screen 9 does not change, and image distortion does not increase. , there is no need to adjust the focus of the lens unit 7 again, and the operability is excellent.

Furthermore, since the document table 15 moves, the document can be moved in parallel, and thick or heavy objects such as books can also be easily moved.

(2) Both ends of the document table 15 are the projection openings 41 of the main body 13
does not move inward from both ends of the projection aperture 4.
1 does not protrude from the original platen 15, and even if the platen glass 51 is provided on the original platen 15, the projection aperture 41 does not need to be provided with a glass.

Further, unlike the movable document table of a copying machine, it is not necessary to move the document from one end to the other with respect to the image input aperture, so one end of the platen glass 51 does not need to cross both edges of the projection aperture 41.

That is, when the document table 15 is moved back and forth, the front end of the platen glass 51 moves back and forth across the front edge of the projection aperture 41, and the rear end of the platen glass 51 moves back and forth across the rear edge of the projection aperture 41.

Therefore, the amount of protrusion of the document table 15 from the main body 13 is much smaller than that of a movable document table of a copying machine, which reduces interference with the surroundings, making it easier to install the actual projector 1, and the edge of the document table 15. Even if an external force is applied to the document platen 15, the movable portion of the document table 15 is not easily damaged.

(3) The movable document table of a copying machine must be moved at a constant speed otherwise the copied image will be distorted, so it is driven by a motor at a constant speed. Furthermore, the document table must be moved from one end of the document to the other, and cannot be stopped midway.

However, in the real projector 1, the document table 15
It is not necessary to move at a constant speed, it can be stopped at any position, and the structure is simple and easy to operate.

(4) The actual projector 1 tends to be set below the center of curvature of the screen 9, but in this case, the amount of movement of the document table 15 in the forward direction with respect to the screen 9 is larger than the amount of movement in the backward direction. Even if the amount of movement of the table 15 is small, it is possible to efficiently project to the lower end of the document.

(5) When the operator operates the fan units 11L and 11R, since the amount of movement of the document table 15 toward the operator is small, the document table 15 can be moved backward without the operator backing up. possible and easy to operate.

(6) Even if the amount of movement in the forward direction relative to the screen 9 is large, since the lens unit 7 is provided in front, it is difficult for people to come into contact with the tip of the document table 15, which is safe.

[Modified example]

Although one embodiment of this invention has been described above, this invention is not limited to the above-mentioned embodiment. For example, in the above-mentioned embodiment, the document table 15 is moved manually, but it is moved electrically by a motor or the like. It may be driven to

[Effect of idea]

In summary, this invention includes a set surface on which an object to be projected is placed, a cover that can be opened and closed to cover the object to be projected placed on the set surface, and a cover that can be opened and closed to cover the object to be projected placed on the set surface. a light source that irradiates light from the object; a reflecting means that reflects a reflected light image of the object irradiated with light by the light source along the set surface; and a reflecting means that projects the reflected light from the reflecting means onto a screen in front of the screen. a case that houses the light source, the reflecting means, and the lens, and has a projection aperture on a surface facing the set surface that regulates the irradiation range of the light source in the direction of the set surface; Since the projection table includes the setting surface and the cover and covers the projection opening and is movable back and forth in the front and back directions with respect to the screen along the projection opening, the shapes of the setting surface and the screen are different. If the projected image protrudes from the screen in the vertical direction, the projection table can be moved to project the protruding portion onto the screen.

Therefore, unlike in the past, the projector is not rotated vertically to view the image protruding from the screen, so the positional relationship between the projector and the screen remains unchanged, and image distortion does not increase. There is no need to refocus the lens, making it easy to operate.

Furthermore, since the movement range regulating means restricts the end of the projection table from moving inward from the edge of the projection aperture, the same end of the set surface does not cross multiple ends of the projection aperture, and The amount of protrusion of the table from the case is much smaller than that of a copying machine's movable document table, which reduces interference with the surroundings and makes it easier to install the projector. Less likely to damage moving parts.

Furthermore, the movement range regulating means makes the amount of movement in the forward direction of the projection table from the reference position where the setting surface and the projection aperture face each other larger than the amount of movement in the backward direction, so that the projector is set below the center of the screen. However, in this case, the amount of movement of the projection table in the forward direction relative to the screen is larger than the amount of movement in the backward direction, so even if the amount of movement of the projection table is small, the object to be projected can be efficiently projected to the bottom edge. .

Also, if the operator is located behind the projector,
Since the amount of movement of the projection table toward the front is small, the operator can move the projection table backward without stepping back, and the operation is easy.

[Brief explanation of the drawing]

1 to 14 show an embodiment of this invention, and each figure represents the following. Figure 1 is a perspective view schematically showing the relationship between the actual projector and the screen and the internal structure of the actual projector, Figure 2 is a perspective view of the actual projector seen from the front, and Figure 3 is the actual projector. 4 is a partial sectional view showing the internal structure, 5 is a plan view of the main body of the actual projector, 6 is a plan view of the document table, and 7 is cover open/close detection. FIG. 8 is a diagram showing the main electric circuit, FIG. 9 and FIG. 10 are diagrams showing a modified example of the structure for detecting the opening and closing of the document cover, and FIG. 12 and 13 are cross-sectional views showing the structure of the heat dissipation member and the grid member.
The figure shows the structure of the screen, and FIG. 14 shows the height relationship between the actual projector and the screen. 1... Actual projector, 3L, 3R... Light source unit, 5... Mirror, 7... Lens unit, 9...
...Screen, 11L, 11R...Fan unit, 15...Document stand, 19...Document cover, 24
... Heat radiation hole, 25 ... Heat radiation plate, 26 ... Net, 41
...Projection aperture, 44...Limit switch, 45
...7 transmission plate, 51 ... platen glass,
53...Push button, 75...Halogen lamp.

Claims (1)

[Claims for Utility Model Registration] (1) A set surface on which an object to be projected is placed, a cover that can be opened and closed to cover the object to be projected placed on this set surface, and a cover placed on said set surface. When a projection object is irradiated with light from below, a light source, a reflecting means for reflecting a reflected light image of the projection object irradiated with light by the light source along the set surface, and a reflected light from this reflecting means are directed forward. a projection aperture that accommodates the light source, the reflecting means, and the lens, and that regulates the irradiation range of the light source in the direction of the set surface on a surface facing the set surface; a case having the setting surface and the cover, a projection table that covers the projection opening and is movable back and forth in the front and rear directions with respect to the screen along the projection opening; the setting surface and the projection opening; movement to make the amount of movement of the projection table in the forward direction larger than the amount of movement in the backward direction from a reference position where the projection table faces, and to restrict the end of the projection table from moving inward from the edge of the projection aperture. A projector comprising a range regulating means. (2) Utility model registration The projector according to claim 1, wherein the projection table is equipped with a detector that detects opening and closing operations of the cover over the entire moving area. .