JPH02236584A - Overhead projector - Google Patents

Abstract

PURPOSE:To project an original in an appropriate size by storing original data, which is read from the original recorded on an arbitrary medium, into a storage medium, automatically enlarging or reducing the original data according to an enlargement or reduction instruction, and projecting it. CONSTITUTION:A storage means P stores the original data (a) read by a reading means O, an enlargement/reduction instructing means Q instructs to enlarge or reduce the original data (a). A data processing means R enlarges or reduces the original data (a) based on an instructing signal (b); an optical shutter S uses a liquid crystal, etc., and its release is controlled based on processed data (c) from a data processing means R. The original data stored in this way can be freely and automatically enlarged/reduced according to the enlargement/ reduction instruction, therefore, the original can be projected in an appropriate size in a room of any size, and it helps to explain easily at a meeting.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overhead projector that projects document information onto a screen. [Summary of the Invention] In an overhead projector, the present invention stores manuscript data read from a manuscript written on an arbitrary medium in a storage medium, and visually enlarges or reduces the manuscript data according to an enlargement or reduction instruction. By processing and projecting, it is possible to project an original at an appropriate size, and it also reduces the effort required to create an original for enlarged or reduced projection. [Prior Art] An overhead projector is used to enlarge and project characters and figures written on a transparent sheet, or images formed on a transparent sheet, onto a screen during seminars and conferences. Conventionally, the original to be projected onto this screen is created by applying black toner to a transparent film using a copying machine capable of copying onto a transparent film. In addition, manuscripts are created by writing images directly on transparent film with an oil-based felt-tip pen, or by printing images onto transparent film. L invention tries to solve a! ] When actually using an overhead projector at a conference, etc., some documents may need to be enlarged and projected. In order to automate this process, Japanese Patent Laid-Open No. 59-20442 discloses a system in which magnification setting information for enlarged projection is stored in advance in an OHP sheet. However, overhead projectors are used in rooms of various sizes and for various numbers of people, and it is difficult to use just by setting the magnification information fixedly in advance. There was a problem that the The invention! ! I! III is to be able to project an original at an appropriate size no matter what size the room is. [Thousand Steps to Solve the Problems The means of the present invention are as follows. The storage means P (see the block diagram in FIG. 1, the same applies hereinafter) stores the original data a read by the storage means O. The enlargement/reduction instruction means Q instructs enlargement or reduction of this manuscript data a. The data processing means R enlarges or reduces the original data a based on the instruction signal b. The optical shutter S uses, for example, a liquid crystal, and its opening/closing is controlled based on processing data C from the data processing means R. [Function] The function of the means of the present invention is as follows. When the document information is read by the reading device O and the document data a is stored in the storage device P, the enlargement/wa small instruction device Q is operated and, for example, when enlargement or reduction ratio information is input, the ratio is An instruction signal b corresponding to the information is output to the data processing means H. When this instruction signal b is input, the data processing means R reads the original data a from the storage means P, performs an enlargement or reduction process on the original data a at a ratio corresponding to the above instruction signal b, and processes the original data a. Output data C to optical shutter S. Then, the optical shutter S is controlled to open and close based on the enlarged or reduced document data (processed data C). In this way, according to the instruction from the enlargement/lit small instruction means Q, the document data that has been visually enlarged or reduced is projected. Therefore, regardless of the size of the room, the original can be projected at an appropriate size. [Example] A detailed explanation will be given below with reference to FIGS. 2 and 3. FIG. 2 is a block diagram of an overhead projector showing an embodiment. It consists of part 5. The manuscript information input section 1 includes a manuscript table 7 for reading manuscripts 6 such as conference materials written on ordinary paper (any medium), and manuscripts such as COD (charge coupled device), TV (television) camera, etc. Consists of a reading device (imaging device) 8, which reads the original Ij! I. Scan the equipment 118! ! The document 6 placed on the X-ray stand 7 is read, the document information written on the document 6 is converted into image data, and the image data is output to the data stack 1 control section 2. This data control section 2 includes a read control section 9, a RAM control section 1
0, a display data processing section 11, and a liquid crystal control section 12. The reading control section 9 drives and controls the document reading device 8 and the image data inputted from the document reading device 1i8.
AM f! Output to jl control section lO. This flAM
The control unit IO temporarily stores the input image data in the RAM (random access memory) 13 of the data storage unit 3. Also. The RAM control unit lO accesses the RAM l3 based on a control instruction from the control instruction unit 4, and outputs the read image data to the display data processing unit l1. The display data processing unit 11 enlarges or reduces the input image data as necessary, and then stores the input image data in the display RAM 14 of the data storage unit 3 as display data in a form corresponding to the liquid crystal light shutter 18, which will be described later. to be memorized. R for this display
The display data stored in the AM 14 is sent to the liquid crystal control unit 12, and the liquid crystal control unit 12 creates a control signal for opening and closing the liquid crystal light shutter 1B according to the input display data and sends it to the liquid crystal light shutter 18. Output. Further, the control instruction section 4 includes a key arrangement section 15 having various keys and a key matrix. and a key control section 16 that detects the operated key by scanning the key matrix of the key arrangement section 15 and outputs the detection signal to the data control section 2, allowing the operator to input document information. This is for giving desired control instructions to the section 1 or the data control section 2. FIG. 3 shows the key items of the key arrangement section 15. 1. In the disaster information input section 1, there is a read key 15A for instructing the reading of the manuscript 6, and image data stored in the data storage section 3. Projection key 15B for projecting, enlarged "4"
4. The numeric key 15C for instructing the reduction ratio, etc., the enlargement key 15D and the reduction key 15E for instructing enlargement and reduction, respectively, are used. The optical control unit 5 also includes a light source l7, a liquid crystal light shutter l8,
Kako lens 19. The liquid crystal shutter 18 includes a light source l such as a halogen lamp.
7 light is illuminated. In this liquid shutter l8, liquid crystals and transparent electrodes are arranged in a matrix to form a large number of optical shutters, and a control voltage (control voltage) from the liquid crystal control unit l2 is applied to the transparent electrodes. By being controlled, the liquid corresponding to each shutter is opened or closed. Therefore, of the light emitted from the light source 17, the light that enters the shutter that is controlled to be in the open state passes through the shutter and enters the prism 20 via the condensing lens 19.
The optical path of the light incident on the prism 20 is changed by 90° due to the total reflection effect of the prism 20, and the light is irradiated onto the screen 2l. On the other hand, the optical path of the incident light to the shutter, which is controlled in a closed state, is blocked by the shutter. In this way, the light emitted from the light source l7 is projected onto the screen 2l according to the open/closed state of each shutter of the liquid product light shutter 18, and each shutter of the liquid crystal light shutter 18 FM4r based on data (display data)
Since AfrAif is applied, the light emitted from the light source 17 projected onto the screen 2l reflects the original. In addition,
A magnifying lens (not shown) is provided behind the prism 20, and the display data shown by the open/closed states of each shutter of the liquid crystal light shutter 18 is magnified and projected onto the screen. Next, the operation of the overhead projector of this embodiment configured as described above will be explained. First, the operation of reading the manuscript information written on the manuscript 6 will be explained. When reading, first place the M document 6 on the document table 7. The type of manuscript medium does not matter as long as this manuscript 6 is written in a visible manner. When the original 6 is placed on the original table 7 and the reading key 15A of the key arrangement part 15 is operated, this operation status is detected by scanning the key matrix by the key control part 16, and the reading control part 9 is activated. The document pick-up device 8 is driven by the control. As a result, the document reading device 218 scans and reads the document information of the original disaster 6, converts it into image data, and outputs it to the RAM i'I#11 section 10. This RAM control unit 10 stores the input image data in an empty area of RAM13. The reading ends in this way, but the reading operation may be performed at a venue such as a seminar and projected immediately, or the reading operation may be performed all at once and projected at a later date at the location of ffl1. You can also do this. In this case, a power source is required to back up the RAM 13, but the data may be stored on a floppy disk and transferred to the RAM 13 during projection. If you want to enlarge or reduce the image data stored in RAMl3 in this way and project it, press the enlargement key 15.
D, or perform key operations in the order of reduction key 15E, n number key 15C, and projection key 15B. For example, if "A" written on the document α shown in Fig. 2 is read and the image data is stored in 11AMl3 as shown in β, and this is to be reduced to 1/2 and projected. Assuming that, the operator will press the reduction key 15E + "2" key → projection key 15B.
Operate as follows. Then, these key operation situations are detected by the key control unit l6, and the detection signal is sent to the RA.
It is output to the M-system W section 10. At this time, the RAM control unit 1
0 is determined to be a 1/2 reduction projection from the above key operation sequence, and a 1/2 reduction instruction signal is sent to the RAM 13.
It is output to the display data processing section 11 together with the image data of "A" read from the . The display data processing unit l1 then
Perform 172 reduction processing on image data “A”. This I/2 reduction processing is performed by deleting (thinning) rows and columns of the bit pattern that constitutes the image data ``A'', but such a method is described in Japanese Patent Publication No. 53-15774 and Japanese Patent Publication No. 56-36434. Since this is a well-known technique disclosed in publications such as Japanese Patent Publication No. 57-27478, a detailed explanation thereof will be omitted. When the display data processing unit 1l completes the 1/2lM small processing, it assembles the reduced data into a form corresponding to each shutter of the liquid crystal optical shutter 18 on the display RAM 14 in order to use it as display data. As a result, display RAM1
4, “A′” is reduced to 172 as shown by γ.
The image (display) data of is stored. Thereafter, the display data in the display RAM 14 is stored in the display data processing section 11.
It is output to the liquid crystal control unit l2 via the RAM control 7I10, and the liquid crystal control unit 12 creates control signals for driving each shutter of the liquid crystal light shutter l8 based on the display data, and outputs them to the liquid crystal light shutter 1B. Then, among the liquid crystal light shutters l8, only the shutter corresponding to "A", which has been reduced to 1/2, is controlled to be in the closed state, and the other shutters are ffflifed to the open state. Therefore, the light source 17
Of the emitted light, the light that enters the shutter in the closed state corresponding to "A" reduced to 1/2 is blocked, and the light that enters the shutter in the other open state is transmitted.
Screen 21 via condensing lens 19 and prism 20
Since the light projected onto the area is only on areas other than the "A" area, which has been reduced to 1/2, the -A'' area, which has been reduced to 1/2, becomes dark, and the other areas become brighter, reducing the area to 1/2. Reduced “A”
”. On the other hand, if you want to enlarge and project the above-mentioned “A” twice, operate the 5 enlargement key 15A→“2” key projection key 15B. Then, the RAM control unit IO determines from this key operation sequence that it is a 2x enlarged projection, and outputs a 2x enlargement instruction signal together with the image data of "A" to the display data processing ffil+. Then, the display data processing unit 11 outputs the image data " What constitutes “A”?/
2-fold enlargement processing is performed by a method such as repeatedly inserting rows and columns of a pattern (this method is also a well-known technique as disclosed in the above-mentioned document). The rest of the operation is the same as for reduction. Note that in the case of normal size projection, the display data processing unit 11 does not perform enlargement/reduction processing, but simply uses the display RAM l.
All that is required is to assemble the image (display) data on A in a form corresponding to each shutter of the liquid crystal light shutter l8. It should be noted that the present invention is not limited to the above embodiment, and for example, a photochromic device utilizing a photochromic effect may be used instead of the liquid crystal light shutter 18. [Effect of the Invention J According to the present invention, the stored manuscript data can be freely and automatically enlarged or reduced by enlarging/reducing instructions, so the manuscript can be projected at an appropriate size in any room. This makes it possible to provide easy-to-understand explanations for various matters. Additionally, there is no need to create a manuscript for enlargement or reduction, which reduces the effort required to create a manuscript.

[Brief explanation of drawings]

Fig. 1 is a block diagram of the tree invention, Fig. 2 is a configuration diagram showing one embodiment, and Fig. 3 is a diagram showing key items of the key arrangement section of Fig. 2. 8... Original reading device, 11... Display data processing unit, l3... RAM, l5... Key placement unit, 18...・LCD light shutter.

Claims (1)

[Claims] storage means for storing manuscript data read by the reading means; enlargement/reduction instruction means for instructing to enlarge or reduce the manuscript data stored in the storage means; and based on instructions from the enlargement/reduction instruction means. An overhead projector comprising: data processing means for enlarging or reducing the document data; and an optical shutter whose opening and closing are controlled based on processing data from the data processing means.