JPH04141641A - Projector - Google Patents

Abstract

PURPOSE:To adjust a screen picture into an easy-to-see state by providing a light quantity adjusting means and a color adjusting means which can adjust the light quantity and color of an image projected on a projector main body which projects a document is projected on a screen. CONSTITUTION:A projector main body 1 has a leg part 1a and a frame part 1b supported thereupon, the projecting means 2 is incorporated in the leg part 1a, and the translucent screen 36 which is writable and erasable is fitted in the frame part 1b. The projecting means 2 projects light on an OHP sheet 46, which is a light-transmissive document placed on a transparent platen 44 installed at a specific position, from the reverse surface to project its image on the screen 36. The light quantity adjusting means 3 and color adjusting means 4 which can adjust the light quantity and color of the image projected on the screen 36 are incorporated in the projector main body 1. Consequently, the picture on the screen 36 can easily be adjusted nearly to a sharp color close to the color of the document by adjusting the light quantity and color of the picture on the screen 36 over a look at the picture on the screen 36.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an overhead projector (hereinafter referred to as
This relates to a projector that projects original documents such as sheets and slides onto a screen (referred to as HP).

[Prior Art] A projector that enlarges documents, drawings, and other originals and projects them onto a screen at meetings etc. has a function to copy the projected original, and a translucent screen that can be written on and erased from the screen. There is a tendency for devices to become more and more multi-functional, such as the ability to copy images projected on or written on.

This type of projector, which has a screen integrated into the projector body and a projection means for projecting an original onto the screen from the back side, is convenient to handle and is therefore often used for conferences and the like.

By the way, a large number of projected documents, especially slides, are colored, but conventional projectors were not equipped with a mechanism to adjust the amount of light or color of the projected image. .

"Problem to be solved by the invention" Especially when projecting a color original, the amount of light and color on the screen are strongly influenced by the brightness of the room in which the projector is used and the spectral wavelength of the lighting equipment in the room.However, With conventional projectors, it was not possible to adjust the amount of light and color of the image projected on the screen, so it was possible to adjust the brightness of the room by installing a dimming device on the lighting equipment in the room, so that the image on the projector screen could be easily seen. However, with indirect means of adjusting the brightness of the room, it was not possible to make subtle adjustments to the brightness of the screen. The entire screen may appear colored red, yellow, etc. due to the influence of .

The present invention has been made in view of the above-mentioned points, and an object thereof is to provide a projector that is equipped with a function for adjusting the light amount and color of the screen, so that the screen can be adjusted to make it easier to see with a simple operation. It is about providing.

[Means for Solving the Problems] In order to achieve the above object, the projector of the present invention has a projector body that projects an original on a screen, and a light amount adjusting means that can adjust the light amount and color of the projected image, respectively. Equipped with color adjustment means.

Preferably, the light amount adjusting means and the color adjusting means are operated by signal input from a remote controller.

[Function] According to the projector of the present invention having the above configuration, the amount of light and the color of the image of the original projected on the screen can be controlled by the light i! installed in the projector body. It is arbitrarily adjusted by an adjustment means and a color adjustment means. Therefore, even if the color of the original is different from that of the original due to the influence of the screen, the projector, or the lighting in the room where it is used, or the original is dark and grainy, you can By adjusting the amount of light and color on the screen, you can easily change the color of the screen to be clear and close to the color of the original.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view from the front of a projector that is an embodiment, and FIGS. 2 and 3 are side and rear views for explaining the outline of its internal structure. A screen 36 and a projection means 2 for projecting an original 46 onto the screen 36 from the back side are integrated into the projector body 1.

The projector main body 1 has a leg portion 1a and a frame portion 1b supported on the leg portion 1a, and a projection means 2 is incorporated in the leg portion 1a.
A translucent screen 36 that allows writing and erasing is attached within the frame 1b.

The projection means 2 includes a transparent document table 4 installed at a predetermined position.
OHP sheet 46 which is a light-transmissive original placed on 4
is projected from the back side and displayed on the screen 36.

The feature of this projector is that the screen 3
The projector main body 1 has built-in illumination adjustment means 3 and color adjustment means 4 for adjusting the light amount and color of the image projected on the projector 6. Before explaining a specific example of this, the projector of the above embodiment The specific structure of the projection means 2 and the copying means 30 attached thereto will be explained.

An image reflecting mirror 38 is mounted on the upper part of the frame 1b on the back surface of the screen 36 so as to be rotatable in the direction of the arrow CSD in FIG. A projector lens 47 is installed below the image reflecting mirror 38, and a light-transmissive document table 44 on which an OHP unit 46 is placed is placed below the projector lens 47. A mirror 45 that reflects light from the projector light source 42 toward the document table 44 is arranged below the document table 44 so as to be rotatable in the directions of arrows E and P in FIG. The projector light source 42 is arranged at a position bent at right angles to the document table 44 by a mirror 45, and is always cooled by a fan 43 while the projector light source 42 is turned on.

A copying means 30 as shown in FIG. 3 is attached to the projector means 7 having the above configuration. The copying means 30 includes two parts: an exposure section 31 that exposes the OHP sheet 46 on the document table 44, and an LED 52 that is a light source that exposes the image read by the scanner 40.
For example, a photosensitive recording medium 53 (described later) is selectively exposed to light using one of the exposure means, and a color developer notebook 6 is exposed.
0 to form the desired image.

The exposure unit 31 scans a reflection plate 83 rotatably mounted on the document table 44 , a Fresnel lens 84 mounted so as to be movable from side to side below the document table 44 , and an OHP sheet 46 on the document table 44 . The exposure unit 50 includes a copy light source 48 and a plurality of folding mirrors 49 that are movable left and right for exposure, a fixed folding mirror 51, and an exposure stage 55 fixed at a predetermined position.

The photosensitive recording medium 53 is, for example, disclosed in Japanese Patent Application Laid-open No. 6214.
The main material is a photocurable resin using a well-known photopolymerization initiator as disclosed in Japanese Patent No. , magenta, and yellow dye precursors are coated on a sorting substrate. This photosensitive recording medium 53 is housed in a cartridge 54 so as not to be exposed to light, and the photosensitive recording medium 53 that comes out of the cartridge 54 passes over an exposure table 55 and is sent to a pressure developing device 56. From the pressure developing device 56, a separating roller 58 It is then routed to a take-up roller 59.

The pressure developing device 56 has a pair of pressure rollers 57 that superpose the photosensitive recording medium 53 selectively exposed on the exposure stage 55 and the developer channel 60 and develop the image under pressure.

The developer sheet 60 is constructed by coating a base paper with a developer described in, for example, Japanese Patent Laid-Open No. 58-88739, and a plurality of sheets are placed in a cassette 61 with the developer-coated side facing upward. It is set towards. Color developer notebook 60 in cassette 61
are taken out one by one by a suction cup 62 starting from the top layer and sent to a pressure developing device 56, and then sent from the pressure developing device 56 to a heat fixing device 70.

The heat fixing device 70 includes a heat roller 71 having a built-in heater 75, an endless heald 74 installed between the heat roller 71 and the roller 72 and used for coloring and glossing the developer sheet 60, and the developer. It is comprised of a pressure roller 73 that applies a predetermined pressure to the heat roller 71 so that the colorant cant 60 and the endless belt 74 are brought into close contact with each other. A paper discharge tray 76 is attached to the outside of the heat fixing device 70.

OHP Note 4 with the projector configured as above
6 on the screen 36 is performed as follows. That is, as shown in FIG. 2, the image reflecting mirror 38 is raised and held in the direction of the arrow, the ○HP note 46 is placed on the document table 44, and a power switch (not shown) is turned on. Then, the mirror 38 is rotated and set in the direction of arrow F, and the lens 47 and Fresnel lens 84 are moved to predetermined positions above and below the document table 44. At this time, the reflection plate 83 is retracted to a predetermined position (in the ■ direction) away from above the document table 44. When the Bronoecta light source 42 lights up in this state, the light is reflected by the mirror 38 and is reflected by the Fresnel lens 84.
, the document table 44, the OHP note 46, and the lens 47.
The light is collected by the image reflection mirror 38 and projected onto the screen 36.

Further, when copying the OHP note 46 on the document table 44, the user presses a copy mode button (not shown). Then, the mirror 38 rotates in the direction of arrow E in FIG. Hold down 46. When the copy button (not shown) is pressed here, the copy light source 48 lights up and the exposure unit 50
The OHP note 46 is scanned and exposed by moving to the right in the figure. The reflected light from the OHP notebook 46 is reflected by the mirror 49.
．． 51 and exposes a photosensitive recording medium 53 on an exposure table 55. The photosensitive recording medium 53 moves in the same direction and at the same speed in synchronization with the exposure unit 50, and a latent image corresponding to the image on the OHP note 46 is formed by exposure. OHP Net 4
When exposure No. 6 is completed, the exposure unit 50 returns to its original position. The photosensitive recording medium 53 on which the latent image has been formed is sent to the pressure developing device 56, where it is overlapped with the developer notebook 60 taken out from the cassette 61, and is sequentially pressed in the width direction by the pressure roller 57. . With the pressure applied at this time, the photosensitive recording medium 5
The uncured microcapsules No. 3 are destroyed, and an image corresponding to the latent image on the photosensitive recording medium 53 is developed on the developer sheet 60. Photosensitive recording medium 53 exiting pressure developing device 56
The color developer sheet 60 is separated by a separation roller 58, and the photosensitive recording medium 53 is wound into a cartridge 54.
The color developer notebook 60 is sent to a heat fixing device 70, where it undergoes development fixation and gloss treatment, and is then discharged onto a paper discharge tray 76.

Next, a case will be described in which an image projected on the screen 36, characters drawn on the screen 36, etc. are copied using the scanner 40 and the LED 52.

In this case, when a copy start button (not shown) on the screen 36 is pressed, the scanner 40 moving along the frame 1b moves in the direction of arrow G as shown in FIG.
The surface of the screen 36 is scanned.

In this one scan, the scanner 40 reads the image on the screen 36, and the scanner 40 moves back in the direction of arrow H to return to its original position. The data read by the scanner 40 is processed by an electronic control circuit 90 shown in FIG.
Copying of the image No. 6 is executed.

The electronic control circuit device 90 includes a CPU 91 as a central processing unit that processes various calculations, a ROM 92 that stores data used for calculations and control, a RAM 93 that temporarily records data as a result of calculations, and a scanner. It has an input interface 94 that receives input signals from 40 and the panel switch 101, and an output interface 95 that outputs control signals to the LED control circuit 102, and performs the following operations. That is, data read by the scanner 40 is temporarily stored in the RAM 93 via the input interface 94, and this stored data is sent to the LED control circuit 102 via the output interface 95.
D52 is turned on to selectively expose the photosensitive recording medium 53. With this exposure, a latent image is formed on the photosensitive recording medium 53 on the screen 36 according to the image, and this latent image is formed on the developer notebook 60.
The image on the screen 36 is then developed and copied.

When copying in monochrome, the LED 52 corresponds to red, green, and blue wavelengths and exposes the photosensitive recording medium 53 according to the transmitted data to form a monochrome latent image. When copying in full color, the screen 36 is scanned by the scanner 40 through red, green, and blue filters, and data corresponding to red, green, and blue is stored in the RAM 93.
It is sufficient to sequentially transmit the information to the LED control circuit 102.

Next, specific examples of the light amount adjusting means 3 and color adjusting means 4, which are the characteristic parts of the present invention, will be explained.

The light adjustment means 3 is a means for varying the light intensity of the projector light source 42, and for example, as shown in FIG. It is composed of a light source control circuit 210 (see FIG. 4). The light amount adjustment switch 202 is a sliding type, and it is turned toward the right (in Fig. 1).
When the light intensity variable data corresponding to the amount of the slide is moved a little in the direction of Dark D (to make it darker), the light amount variable data is transmitted from the input interface 94 of the electronic control circuit 90 in FIG. 4 to the CPtJ91.
After the CPU 91 calculates this, it is sent to the light amount control circuit 210 via the output interface 95.

The light source control circuit 210 controls the light intensity of the projector light source 42 to be reduced according to input data. When the light amount adjustment switch 202 is slid to the left (toward the brighter light L), the light amount of the projector light source 42 increases. Such control to increase or decrease the amount of light can be performed while looking at the screen.

The color adjustment means 4 is for adjusting the overall color of the screen, and includes, for example, three color filters 203R, 203G of red, green, and blue arranged so as to be able to enter and exit the optical path near the projector light source 42. , 203B. Three color filters 203R, 203G, 203B
As shown in FIG. 1, the light on the front of the projector main body 1 corresponds to ! Three color adjustment switches 201R, 201G, and 201B are installed near the adjustment switch 202. Each color adjustment switch 201R, 201G, 20
The color adjustment data obtained by the operation of 1B is sent to the electronic control circuit 90, from which the color filters 203R, 203G,
Filter control circuit 211 that independently drives 203B
and the filter control circuit 211 controls the motor 212.
Drive the color filter through.

According to the color adjustment means 4, when the screen looks strangely colored due to the color of the lighting in the room, etc., the color of the screen can be adjusted as follows.

For example, if the screen looks reddish, slide the blue color adjustment switch 201R a little to the right (in the direction of C) in FIG. Then, color adjustment data corresponding to this slide is sent to the CPU 91 via the input interface 94, the CPU 91 calculates this, and the calculated data is sent from the output interface 95 to the filter control circuit 211 to drive the motor 212. . Then, due to this drive, the red color filter 203R moves downward to be slightly out of the optical path of the projector light source 42, or the green color filter 203G and the blue color filter 203B move to the side of the optical path of the projector 42. Drive control for upward movement is performed. As a result, the light from the projector light source 42 that passes through the color filters 203R203G 203B becomes cyan-tinged, and as a result, the entire screen loses its reddish tinge, making it easier to see.

Similarly, the entire screen looks blue,
If it looks greenish, just slide the corresponding color adjustment switches 201R, 201G, and 201B. Such a switch operation can be easily and reliably performed by checking that the color of the screen changes in a direction that is easy to see while looking at the screen.

It is convenient to be able to adjust the light amount and color of the screen as described above even from a location away from the projector using a remote controller 7 as shown in FIG. That is, the remote controller 7 controls the light amount adjustment switch 202 and the color adjustment switches 201R and 201.
A light amount adjustment switch 205 corresponding to G, 201B, color adjustment switches 204R, 204G, and 204B, an input interface 207 into which signals based on the operation of these switches are input, and a transmitter for transmitting signals from the input interface 207 using infrared rays or the like. Correspondingly, the electronic control circuit 90 of the projector receives a transmission signal from the transmission LED 208 and inputs it to the input interface 94.
D 209 is attached. The reception LED 209 is
As shown in FIG. 1, if it is attached to the front of the projector main body I, it is convenient to be able to remotely control the light amount and color adjustment of the screen from in front of the screen 36. In addition,
Adjustment of the light amount and color of the screen by the remote controller 7 is performed in the same manner as described above, so the details thereof will be omitted.

The present invention is not limited to the above-described embodiments; for example, the color adjustment means for adjusting the color of the screen is not limited to red, blue, and green color filters, but may also be Noan, magenta, and yellow color filters. In addition, the light amount adjustment switch and color adjustment switch are digital percentage types.Furthermore, in the above embodiment, the light amount and color of the screen are adjusted by switch operation, but the brightness of the room is adjusted near the projector main body 1. It is also possible to install a light sensor for detection and automatically adjust the amount of light and color of the screen based on the signal from the light sensor.

[Effects of the Invention] As explained above, according to the projector of the present invention,
If the image of the original projected on the screen is affected by the lighting in the room where the projector is used, it becomes dark due to insufficient light, or the spectral wavelength of the lighting causes the image to become a different color from the original. In addition, the amount of light and color can be easily adjusted to make the screen clear and easy to view. Further, according to the projector according to the second aspect of the present invention, these adjustments can be made using a remote controller from a location away from the projector and the screen, which is extremely convenient.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the projector according to the present invention, FIG. 2 is a side view for explaining the outline of the internal structure of the projector shown in FIG. 1, FIG. 3 is a rear view of the same, and FIG. 2 is a block diagram showing an electrical circuit of the projector of FIG. 1. FIG. ■ - Projector body, 2 - Projection means, 3. Light adjustment means, 4. Color adjustment means, 7. Remote control.

Claims (1)

[Claims] 1. A projector body that projects an original onto a screen,
A projector characterized by being equipped with a light amount adjustment means and a color adjustment means that can respectively adjust the light amount and color of a projected image. 2. The projector according to claim 1, wherein the light amount adjusting means and the color adjusting means are operated by signal input from a remote controller.