JPH11295812A - Projector device provided with image pickup unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector device provided with image pickup unit small in size and light in weight by simplifying a configuration. SOLUTION: This projector device has the image pickup unit 2 for executing the image pickup of a picture-and-writing original and outputting a picture signal, a liquid crystal panel 4 driven by the picture signal, a light-emitting means for projecting a picture displayed on the liquid crystal panel 4 and a spectrally splitting means for spectrally splitting a part of the light of the light- emitting means and illuminating the picture-and-writing original. Also, the light- emitting means has a white light source 10 and a filter 7 provided with red, green and blue transmission areas where the light of the white light source 10 is sequentially transmitted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projector with an image pickup device for picking up a document such as a document or a drawing by an image pickup device and projecting the picked-up image on a screen or the like.

[0002]

2. Description of the Related Art In a presentation, a projector device with an image pickup device is used which picks up an image of a document or the like placed on a document table with an attached image pickup device and projects the picked-up image on a screen or the like.

FIG. 3 is a configuration diagram of a conventional projector device with an image pickup device. A conventional projector device with an image pickup device includes an illumination light source 13, a rotating color filter disk 2,
4, an imaging unit 200 including the imaging element 26 and the like, and a projection unit 100 including the projection light source 10, the rotating color filter disk 7, the liquid crystal panel 4, and the like.

The illumination light source 13 emits white light L7, and illuminates a document 31 placed on the document table 8. The reflected light L8 reflected on the document 31 passes through the rotating color filter disk 24 via the imaging lens 12.

The rotating color filter disk 24 is a filter disk configured to have transmission spectral characteristics of red, green, and blue by 120 degrees, and is rotated by a motor 25 in one frame period which is an imaging period for one screen. It is driven to rotate.

[0006] The image pickup device 26 includes a rotating color filter disk 2.
The color sequential imaging light L9 that has passed through 4 is imaged and converted into an electric signal, and the color sequential imaging signal S6 is output to the signal processing circuit 28. The color sequential drive synchronization circuit 27 outputs a drive signal S7 to the motor 25 to rotate the rotary color filter disk 24, and outputs a synchronization signal S8 synchronized with the rotation of the motor 25 to the signal processing circuit 28.

The signal processing circuit 28 has a color sequential image signal S6.
And a synchronizing signal S8 to generate a color sequential image signal S4 synchronized with the rotation of the rotating color filter disk 24, and output it to the liquid crystal panel drive circuit 12 described later.

On the other hand, the projection light source 10 of the projection unit 100
A light source that emits white light L1 and a color sequential drive synchronization circuit 23
Is turned on or off by a lighting control signal S1 output from the controller.

The rotating color filter disk 7 is a filter disk configured to have transmission spectral characteristics of red, green, and blue by 120 degrees, and is driven to rotate by a motor 11. Therefore, when the white light L1 emitted from the projection light source 10 passes through the rotary color filter disk 7, the white light L1 is decomposed into color-sequential light L2 in which red, green, and blue lights are arranged in chronological order.

The motor 11 has a color sequential drive synchronization circuit 23
Is driven to rotate once in one frame period corresponding to one screen of an image to be projected, by the rotation control signal S2 output from.

The color sequential drive synchronization circuit 23 includes a light source 1 for projection.
0, a rotation control signal S2 is output to the motor 11, and a liquid crystal panel drive circuit 12 is output.
Outputs the color sequential synchronization signal S3.

The liquid crystal panel drive circuit 12 synchronizes the red, green, and blue periods of the color sequential image signal S4 with the red, green, and blue periods of the color sequential light L2 by using the color sequential synchronization signal S3. 4 outputs a liquid crystal drive signal S5.

The liquid crystal panel 4 has substantially the same number of pixels as the number of pixels of the image sensor 26, and transmission and blocking of each pixel are controlled by a liquid crystal drive signal S5. Accordingly, the red, green, and blue color sequential light L2 is modulated by the red, green, and blue color sequential image signal S4 to become color sequential modulated light L5, which is projected from the projection lens 1 onto the screen 30.

The relay lens 6 narrows the color sequential light L2 transmitted through the rotary color filter disk 7 to a diameter corresponding to the size of the liquid crystal panel 4, and the deflecting plate 5 operates the liquid crystal panel 4 as a light valve. Therefore, only a specific deflection component of the color sequential light L2 is passed.

[0015]

As described above, the conventional projector with an image pickup apparatus has a color sequential separation section in each of the image pickup section 200 and the projection section 100, and performs image pickup and projection in synchronization with each other. I was going.

That is, the projection unit 100 includes the projection light source 10,
It has a rotating color filter disk 7, a motor 11, and a color sequential drive synchronization circuit 23.
3. It had a rotating color filter disk 24, a motor 25 and a color sequential drive synchronization circuit 27.

However, the imaging unit 200 and the projection unit 10
Since both of the color filters have substantially the same color-separated portions, the configuration of the projector device with the image pickup device is complicated, and it has been difficult to reduce the size and weight of the projector device.

Therefore, the present invention solves these problems,
It is an object of the present invention to provide a small and lightweight projector device with an imaging device with a simplified configuration.

[0019]

An object of the present invention is to provide an image pickup apparatus for picking up a document and outputting an image signal, a liquid crystal panel driven by the image signal, and projecting an image displayed on the liquid crystal panel. The object is attained by providing a projector device with an imaging device, comprising: a light emitting unit; and a spectral unit that separates a part of light of the light emitting unit to illuminate the document.

According to the present invention, a part of the light emitted from the light emitting means for projecting an image on the screen is separated and used as illumination light for a document, so that it is not necessary to provide a separate light emitting means in the image pickup unit. Is simplified, and a projector device with an imaging device that is reduced in size and weight can be provided.

Further, the light emitting means of the projector device with the image pickup device according to the present invention has a white light source and a filter having red, green, and blue transmission regions for sequentially transmitting the light of the white light source. Features.

According to the present invention, the light emitting means is provided with a white light source and a filter having red, green, and blue transmitting regions to emit red, green, and blue light.
Since green and blue color sequential light can be generated, illumination light obtained by dispersing a part of the light of the light emitting means also becomes red, green and blue color sequential light. Therefore, it is not necessary to provide the image pickup unit with a color-separation unit such as a rotating color filter disk, a motor, and a color-sequential drive synchronization circuit. .

Further, the light emitting means of the projector device with the image pickup device according to the present invention is characterized in that the light is turned off during a switching period of the transmission area of the filter.

According to the present invention, since the light emitting means is turned off during the switching period of the transmission area of the filter, the red, green, and
A projector device with an imaging device that projects an image with high color purity without color mixture of blue color sequential light can be provided.

Further, in the projector device with the image pickup device according to the present invention, the spectral means is a half mirror.

According to the present invention, since a half-mirror illuminates a document by dispersing a part of the light emitted from the light-emitting means, it is possible to provide a projector device with an image pickup device having a simplified configuration and reduced size and weight.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a projector device with an imaging device according to an embodiment of the present invention.

The projector device with an imaging device according to the present embodiment includes a document 31 placed on a document table 8.
And a projection unit 100 including a projection lens 1 for projecting an image captured by the imaging unit 200 onto a screen 30.

The projection unit 100 includes a light source 10, a rotating color filter disk 7, and a half mirror 9, which chronologically decompose the white light L1 emitted from the light source 10 into red, green, and blue sequential lights L2.
A liquid crystal panel 4 that modulates the color sequential light L3 transmitted through the liquid crystal panel with a liquid crystal drive signal S5, and a projection lens 1 that projects the color sequential light L5 modulated by the liquid crystal panel 4 onto a screen 30.

The light source 10 is a light source that emits white light L1, and is turned on and off in accordance with the color sequential timing by a lighting control signal S1 output from the color sequential time division timing generation circuit 13. As the light source 10, a uniform light emission spectrum, a high light emission efficiency, a long life, and the like are required, and a metal halide lamp, a halogen lamp, a xenon lamp, or the like is used.

The on / off control of the light source 10 in accordance with the color sequential timing is to prevent color mixing due to red, green and blue color sequential lights, as will be described in detail later. The light source 1
0 may be turned on continuously, and the continuous light may be turned on and off by a shutter or the like in accordance with the color sequential timing.

The rotation color filter disk 7 has a rotation angle of 120.
The filter disk is configured to have transmission spectral characteristics of red, green, and blue by degree, and is rotationally driven by a motor 11. Therefore, when the white light L1 emitted from the light source 10 passes through the rotating color filter disk 7, red, green, and blue lights are decomposed into color-sequential light L2 arranged in time series.

The motor 11 is controlled by the rotation control signal S2 output from the color sequential time division timing generation circuit 13
Control is performed so as to make one rotation in one frame period Tf corresponding to a display period of one screen of an image to be projected.

One frame period Tf is a period including a color sequential period Tc corresponding to a display period of red, green, and blue images, and coincides with a period in which the rotating color filter disk 7 makes one rotation. That is, since the rotating color filter disk 7 has red, green, and blue filter regions divided into 120 degrees,
The sum of three color sequential periods Tc that transmit red, green, and blue light is one frame period Tf, and the following equation is established.

Tf = Tc × 3 Accordingly, when the white light L1 passes through the rotating color filter disk 7, the white light L1 becomes the color sequential light L2 in which red, green and blue lights are repeated every color sequential period Tc.

The color sequential time division timing generation circuit 13
A signal having one cycle of the color sequential period Tc is generated,
A rotation control signal S2 for rotating the motor 11 once in one frame period Tf is output, and a lighting control signal S1 for turning on and off the light source 10 is output.

The color sequential time division timing generation circuit 1
Reference numeral 3 outputs a color sequential synchronization signal S3 to the liquid crystal panel drive circuit 12.

The half mirror 9 is arranged in the optical path of the color-sequential light L2 temporally and color-separated by the rotary color filter disk 7, and transmits the color-sequential light L3 in the direction of the relay lens 6 and one of them. The light of the portion is split and the color sequential light L4 is reflected in the direction of the reflection mirror 3.

The half mirror 9 is for, for example, depositing a thin film of a predetermined thickness on a glass surface or laminating a dielectric thin film in multiple layers, and disperses incident light into transmitted light and reflected light. . The ratio between the transmitted light and the reflected light varies depending on the thickness of the thin film and the like, and is selected in consideration of the light emission intensity of the light source 10, the illuminance required for the subject, and the like.

The reflection mirror 3 reflects the color-sequential light L 4 split by the half mirror 9 and illuminates the document 31 placed on the document table 8. In this way, manuscript 3
Numeral 1 is illuminated with red, green, and blue color sequential light L4, and reflects each light as color sequential imaging light L6 according to the red, green, and blue color components contained in the document 31.

The document imaging device 2 is a CCD (charge)
The document 31 is imaged by an image sensor such as a coupled device, converted into a color-sequential image signal S4, and output to the liquid crystal panel drive circuit 12.

As described above, the document 31 is red, green,
Color sequential light L in which blue light is repeated every color sequential period Tc
Therefore, during the color sequential period Tc during which the red light is irradiated, red light of an amount corresponding to the red color component of the document 31 is reflected. Similarly, during the color sequential period Tc during which green light is irradiated, green light of an amount corresponding to the green color component of the document 31 is reflected, and during the color sequential period Tc when blue light is irradiated. It reflects the amount of blue light corresponding to the blue color component of the document 31.

Accordingly, the document image capturing apparatus 2 performs the color sequential period T
Since the color sequential imaging light L6 corresponding to the red, green, and blue color components of the document original 31 is captured for each c, the color sequential image signal S4 output from the document imaging device 2 is synchronized with the color sequential period Tc. It becomes an image signal of the red, green, and blue components.

As described above, in this embodiment, since the light from the light source 10 is used as the illumination light for the subject, a light source for illuminating the subject is not required, and the illumination light for the subject is color sequential light. A rotating color filter disk in the imaging unit 200,
There is no need to provide a color-separated portion such as a motor and a color-sequential drive synchronization circuit, so that the configuration of the projector device with the imaging device is simplified, and the size and weight can be reduced.

The liquid crystal panel drive circuit 12 synchronizes the red, green, and blue periods of the color sequential image signal S4 with the red, green, and blue periods of the color sequential light L3 by using the color sequential synchronization signal S3. 4 outputs a liquid crystal drive signal S5.

For example, the liquid crystal panel drive circuit 12 sequentially writes the input color sequential image signal S4 into an internal memory, and drives the liquid crystal panel 4 to drive the liquid crystal panel 4 in the next color sequential period Tc after one frame period Tf. The signal S5 is output.
In this case, contrast enhancement is applied to the color sequential image signal S4,
Image processing such as edge enhancement and hue adjustment can be performed,
A high-quality image can be projected on the screen 30.

The liquid crystal panel 4 is, for example, an active matrix type liquid crystal element, and has substantially the same number of pixels as the document imaging device 2. Each pixel of the liquid crystal panel 4 is driven by the liquid crystal driving signal S5 at the same time when the color sequential light L3 is irradiated. Therefore, red, green, and blue color sequential light L3
Are modulated by the color sequential image signal S4 of red, green, and blue to become color sequential modulated light L5, and are projected from the projection lens 1 to the screen 30.

The relay lens 6 includes a half mirror 9
Of the color sequential light L3 transmitted through the liquid crystal panel 4 to a diameter corresponding to the size of the liquid crystal panel 4. The deflecting plate 5 allows only a specific deflecting component of the color sequential light L3 to pass in order to operate the liquid crystal panel 4 as a light valve.

FIG. 2 is a timing chart of signals and light according to the embodiment of the present invention. The operation timing of each unit will be described with reference to FIG.

FIG. 2A shows a lighting control signal S1 for controlling the light source 10 to turn on and off. Lighting control signal S1
Is generated in the color-sequential time-division timing generation circuit 13 with reference to the color-sequential period Tc. Note that Tc × 3 is one frame period Tf.

FIG. 2B shows the lighting timing of the white light L1 emitted from the light source 10. The light source 10 is turned on when the lighting control signal S1 is at H level, and turned off when it is at L level. That is, the light source 10 is turned off during a period in which the red, green, and blue filter regions of the rotating color filter disk 7 are switched.

FIG. 2 (3) schematically shows the rotation of the rotary color filter disk 7. As described above, the rotating color filter disk 7 is synchronized with the lighting control signal S1, and the one frame period T
One rotation at f. Further, the duration of the red, green, and blue filter regions corresponds to the color sequential period Tc.

FIG. 2D shows the color sequential lights L2, L3 and L4 transmitted through the rotary color filter disk 7. Color sequential light L
2 and the like exist as red, green, and blue light only during the period in which the light source 10 is turned on. This is to eliminate the color mixing in the hatched period in FIG. 2 (2) where the red, green and blue filter regions of the rotating color filter disk 7 rotating at high speed are switched, and to increase the color purity of the light projected on the screen. is there.

FIG. 2 (5) shows a color sequential image signal S 4 output from the document image pickup device 2. As described above, the subject imaged by the document imaging apparatus 2 is irradiated with the color sequential light L4 that switches between red, green, and blue every color sequential period Tc. Therefore, the color sequential image signal S output from the document image pickup device 2
4 is output as an image signal corresponding to the red, green, and blue color components of the subject for each color sequential period Tc.

FIG. 2 (6) shows a state where the light is modulated by the liquid crystal panel 4.
3 shows color sequential modulated light L5 projected from a projection lens 1 onto a screen 30. The color-sequentially modulated light L5 is modulated by the color-sequential image signal S4 with a delay of one frame period Tf,
A full-color image is projected by three modulated lights that project green and blue images.

As described above, the present invention has been described according to the embodiments. However, such embodiments do not limit the technical scope of the present invention.

[0057]

As described above, according to the present invention, a part of the light emitted from the light emitting means for projecting an image on a screen is separated and used as illumination light for a document, so that a separate light emitting means is provided for the imaging unit. Therefore, it is possible to provide a projector device with an imaging device that has a simplified configuration, is small in size and light in weight, and does not need to be provided.

According to the present invention, the light emitting means is red,
Since green and blue color sequential lights are emitted, illumination light obtained by dispersing a part of the light of the light emitting means also becomes red, green and blue color sequential lights.
Therefore, a rotating color filter disk, a motor,
There is no need to provide a color-sequential separation section such as a color-sequential drive synchronization circuit, and it is possible to provide a projector device with an imaging device with a simplified configuration and reduced size and weight.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a projector device with an imaging device according to an embodiment of the present invention.

FIG. 2 is a timing chart of signals and light according to the embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional projector device with an imaging device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Projection lens 2 Document imaging device 3 Reflection mirror 4 Liquid crystal panel 5 Deflector 6 Relay lens 7 Rotating color filter disk 8 Reference table 9 Half mirror 10 Light source 11 Motor 12 Liquid crystal panel drive circuit 13 Color sequential time division timing generation circuit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // H04N 5/222 H04N 5/222 Z 9/31 9/31 C

Claims (4)

[Claims] An image pickup device for picking up an image of a document and outputting an image signal; a liquid crystal panel driven by the image signal; a light emitting means for projecting an image displayed on the liquid crystal panel; And a spectroscopic means for dispersing a part of the document to illuminate the document. 2. An imaging apparatus according to claim 1, wherein said light emitting means includes a white light source and a filter having red, green, and blue transmitting regions for sequentially transmitting light from said white light source. Projector device with device. 3. The projector according to claim 2, wherein the light emitting unit is turned off during a period when the transmission area of the filter is switched. 4. The projector according to claim 1, wherein the spectroscopic unit is a half mirror.