JPH06130493A - Slide projector device - Google Patents

Abstract

PURPOSE:To provide a slide projector device in which the screen brightness is hanged properly in accordance with the applicable slide film. CONSTITUTION:The projection light emitted from a halogen lamp 1 is reflected by a reflex plate 2 and passes through a slide film 3 provided with a magnetic recording medium 7, and the image is passed through a condenser lens 4 and projector lens 5, enlarged, and builds a picture on a screen 6. The recording medium 7 can record the information about the brightness, etc., about the image to be read out by a reproducing magnetic head 8 at the time of projection, or the information can be written by a recording magnetic head 9, and on the basis of the information, a lamp brightness changing circuit 12 adjusts the lightness of the halogen lamp 1 so that a brightness proper for the image projected is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slide projection device which uses a film having a magnetic recording portion and is capable of writing and reading information on a projected image.

[0002]

2. Description of the Related Art Generally, when viewing a projected image by a slide projection device loaded with a plurality of slide films,
Description of the Related Art There is a method in which a commentary on a slide film, music, sound effects, etc. are recorded on a separate tape recorder, and synchronized with the automatic change of the slide film so that they can be viewed with a sound and an image (video).

[0003]

Since the slide films loaded in the above-described conventional slide projection apparatus usually have different brightness, the screen brightness of the projected image is different. That is, if the screen brightness is too low, the image becomes dark and difficult to see, while
If it is too high, it causes eye fatigue. In particular, when a large number of slide films are loaded in a magazine or the like and a viewer watches for a long time, the viewer's eyes are adversely affected and tired. However, in order to eliminate such an adverse effect, it is not easy and practically difficult for the operator to adjust the screen brightness of the image every time the slide film is changed. Therefore, an object of the present invention is to provide a slide projection device that changes the screen brightness to a suitable screen brightness according to each slide film.

[0004]

To achieve the above object, the present invention provides a projection brightness adjusting means for adjusting the brightness of a projected image projected on a screen in a slide projector capable of imaging a slide film. A magnetic information reproducing means for reading magnetic information recorded on a film having a magnetic recording portion, and a projection luminance control means for adjusting the luminance of the projection luminance adjusting means based on the reproduction information of the magnetic information reproducing means. A configured slide projection device is provided. Also provided is a slide projection apparatus further including a magnetic information recording unit capable of writing and / or rewriting magnetic information on a film having the magnetic recording unit.

[0005]

In the slide projection apparatus having the above-described structure, the projection light is automatically adjusted for the image of each slide film on the basis of the recorded brightness information or the brightness information to be recorded, and a suitable brightness is obtained. The image is projected on the screen.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows and describes a basic configuration of a slide projection apparatus as an embodiment according to the present invention.

In this slide projection apparatus, the projection light emitted from the halogen lamp 1 is reflected by the reflection plate 2,
It is incident on the slide film 3. The image on the slide film 3 is projected, and the projection light is first condensed by the condenser lens 4 and further transmitted through the projection lens 5 to be enlarged and projected on the screen 6 as an image.

The slide film 3 is provided with, for example, a magnetic recording medium 7 along the perforation direction. In this embodiment, data relating to the image on the slide film 3 is recorded.

A retractable reproducing magnetic head 8 for reproducing data recorded on the magnetic recording medium 7 and a retractable recording magnetic head 9 for writing desired information on the magnetic recording medium 7 are provided. It is provided so as to abut. The reproducing magnetic head 8 is driven by the reproducing magnetic head drive circuit 10, and the recording magnetic head 9 is driven by the recording magnetic head drive circuit 11. The brightness of the halogen lamp 1 is adjusted by the lamp brightness changing circuit 12.

The reproducing magnetic head drive circuit 10, the recording magnetic head drive circuit 11, and the lamp brightness changing circuit 12 are controlled in timing and the like by a central processing circuit (CPU) 13, and the CPU 13 is controlled by the CPU 13. A keyboard 14 for inputting data from the outside is connected. Next, the projection operation of the slide projection apparatus configured as described above will be described.

First, in a slide projection apparatus, a known film magazine (not shown) loaded with a large number of slide films 3 is rotated, and as shown in the positional relationship shown in FIG. 1, between the condenser lens 4 and the halogen lamp 1. The slide film 3 is set.

Next, the reproducing magnetic head 8 scans the head itself in order to read the data previously recorded on the magnetic recording medium 7 formed on the slide film 3. At this time, the scanning direction may be left to right or right to left.

The data of the slide film 3 obtained by the scanning of the reproducing magnetic head 8 is as follows.
It is taken into the CPU 13 via the reproducing head drive circuit 10. Here, the data taken in by the CPU 13 is the screen brightness information of the slide film 3, and based on this, it is suitable for the slide film 3 to be copied from now on through the lamp brightness changing circuit 12. The halogen lamp 51 is turned on by adjusting the amount of light so that the projected light has a brightness.

Then, the light of the halogen lamp 1 which has been turned on is reflected by the reflection plate 2 and applied to the entire frame of the slide film 3 without waste. Next, the light of the halogen lamp 1 that has passed through the slide film 3 enters the condenser lens 4, is once condensed, and then passes through the projection lens 5 to enlarge the image and project it on the screen 6. To be done.
In the above-described embodiment, the brightness information regarding the screen brightness of the projected image recorded in advance on the magnetic recording medium 7 is reproduced,
The case where the image of the slide film 3 is projected on the screen 6 has been described. Next, the case where information such as screen brightness suitable for the image is written in the magnetic recording medium 7 will be described.

First, a known film magazine (not shown) loaded with a large number of slide films 3 is rotated,
As in the positional relationship shown in FIG. 1, the slide film 3 is set between the condenser lens 4 and the halogen lamp 1.

Next, the operator uses the keyboard 14 to obtain the desired screen luminance data (luminance information) from the CPU 1.
Enter in 3. In this embodiment, the keyboard is used,
Any input member may be used as long as it can be input from the outside. The CPU 13 operates the lamp luminance changing circuit 12 based on the inputted luminance information to adjust the luminance of the halogen lamp 1.

Further, the CPU 12 transfers a control signal for instructing the writing of the luminance information to the magnetic recording medium 7 of the slide film 3 to the recording magnetic head drive circuit 9, and receives the recording magnetic head drive circuit. Reference numeral 9 scans the recording magnetic head 9 to write the brightness information on the magnetic recording medium 7. Next, FIG. 2 and FIG. 3 show examples of recording / reproducing circuits and waveforms of their drive signals.
The reproduction method will be described. In this recording / reproducing system, the magnetic recording medium 7 is set in three states, that is, the magnetized state in the N direction, the magnetized state in the S direction, and the neutral state.

For example, assuming that the magnetization state in the N direction is "1" and the magnetization state in the S direction is "0", the case of recording "1" will be described. When “H” is output to the OUT1 port of the CPU 13, a current I ₁ flows through the coil of the magnetic recording head 9 via the buffer 21. At this time, the magnetic recording medium 7 is magnetized in the N direction. On the contrary, when "0" is recorded, when "H" is output to the OUT0 port of the CPU 13, _I0 flows through the coil of the magnetic recording head 9 through the buffer 22 and is magnetized in the S direction. It
The advantage of this recording method is that since a neutral area is provided between bits, the boundary of bit data becomes clear and a synchronization clock is unnecessary.

On the other hand, in the case of reproducing, when the magnetized portion of the magnetic recording medium 7 moves while contacting the magnetic reproducing head 8, the magnetic field passing through the head changes, so that a voltage is generated. The voltage is amplified by the head amplifier 23 (see FIG.
(E)), differentiated by the differentiation circuit 24 (FIG. 3 (f)), and input to the comparators 25 and 26. Recorded data
When the data is "1", the differential output (f) is a negative peak, so the output of the comparator 25 is inverted and the CPU1
The "H" signal is input to the port IN1 of No. 3. vice versa,
When the recorded data is "0", the differential output (f) becomes a positive peak, so the comparator 26 is inverted and the "H" signal is sent to the port IN0 of the CPU 13. Is entered.

Next, FIG. 4 shows a specific configuration example of the lamp luminance changing circuit 12 shown in FIG. In this circuit, by operating the eight lines connected to the CPU 13, the halogen lamp 1 can be turned on by changing the brightness (luminance) in eight steps.

First, in the configuration of the lamp brightness changing circuit 12, the lines P _{0 to} P ₇ connected from the CPU 13 are connected.
Are connected to TTL NAND circuits N _{0 to} N ₇ , and further, they are respectively connected to transistors Q _{0 to} Q ₇ and resistors R _{0 to} R _8.
Is connected to the halogen lamp 1 via.

The flow of the current i will be described below.
The Vcc line of the halogen lamp 1 (not shown) is the positive electrode (+) coming from the power source. Here, if all the transistors Q ₀ to Q ₇ are not turned on, current flows through the halogen lamp 1 and the resistor R ₈ to GND.

Next, when only the transistor Q ₀ is turned on and the transistors Q ₁ to Q ₇ are turned off, the current passes through the halogen lamp 1 and one also passes through the resistor R ₈ to GND. But the other goes through the resistor R ₀ , through the collector of the transistor Q ₀ , then the base,
Then, it flows through the emitter to GND.

That is, the line of the current i has flowed. Here, from the transistor Q ₀ is "H" active, in the CPU 13, by changing from "L" to the line P ₀ "H", the line L ₀ of the NAND circuit N ₀ is to become a "H" , The current line i is established. At this time, the CPU 13 outputs "H" on the other lines P ₁ to P ₇ .

Next, when only the transistor Q ₇ is turned on and the transistors Q ₀ to Q ₆ are turned off, the current flows through the halogen lamp 1 and all the resistors R ₀ to R ₇ , and the transistor Q ₇ Enter and fall to GND.

The values of the resistors R ₀ to R ₇ may be appropriate, but by setting the same values, eight steps of brightness at equal intervals can be obtained, and the resistance R ₈ acts to start the lighting of the lamp. The current at that time is several times as high as that at the rated lighting of the lamp, so it works as a small current to protect it.

In general, a current that does not turn on the lamp is passed. As a result, the current at the start of switching the brightness can be reduced, and the overload operation to each transistor can be prevented. Therefore, in the CPU 13, the luminance of the halogen lamp 1 can be changed by turning on only one of the transistors Q _{0 to} Q ₇ and turning off all the others.

Since the brightness of the halogen lamp 1 is determined by the current flowing through the halogen lamp 1, only when the transistor Q ₀ is turned on and when the transistor Q ₀ is turned on.
_When only ₁ is turned on, it becomes clearer when only the transistor Q ₀ is turned on.

The order of brightness is the brightest when only the transistor Q ₀ is turned on, then the order when only the transistor Q ₁ is turned on, and when only the transistor Q ₇ is turned on. It becomes the darkest and can create 8 levels of brightness. Also, halogen lamp 1
As a structure for switching the brightness of the CPU, it is realized by a combination of a resistor and a transistor.
The resistance value can be changed from the halogen lamp 1
The current is not limited to this as long as the current can be controlled. Next, the operation of writing the above-mentioned data (luminance information) will be described with reference to the flowchart of FIG.

First, the slide film 3 is set at a position where it can be projected, data input is started, and one of the data inputs from "0" to "7" from the keyboard 14 is input. Stand by (step S1). This data consists of eight lines (ports) connected to the CPU 13 shown in FIG.
It corresponds to P ₀ to P ₇ , and is any value from “0” to “7”.

For example, data (dat) from the keyboard 14
It is assumed that "0" is input as a). This "0"
When the data is input, the lamp brightness changing circuit 12 converts the data so that the brightness according to the data is projected on the screen 1 (step S).
2). At this time, first, the lamp brightness changing circuit 12 and the CPU 1
Focusing on the relation of No. 3, the CPU 13 gives the halogen lamp 1 with the brightness of any one of the eight brightness patterns.
When any one of the ports P ₀ to P ₇ is turned on when turning on, all other ports should be turned off.

Therefore, in order to make the luminance data input from the keyboard 14 correspond to the port of the CPU 13, when the input data from the keyboard 14 is "0". , Port P ₀ is turned on, and other ports are turned off. Similarly, input data - when the data is "3", port - to turn on the only door P _3. Here, the conversion of the above-mentioned data will be described.

[0033] The key - board - de input from de 14 - data is at "0", the port - using only bets P _0, in order to turn on the transistors Q _0, port - a preparative P ₇ The bit data up to P ₀ becomes "11111110" in order.

Actually, the data from the keyboard 14 is
Since the data is 1 byte in hexadecimal form, if the data to be converted is also represented by 1 byte, the bit data from the ports P ₇ to P ₀ is represented by "FE", and the code Stored in the address Ldata. Similarly, if the input data is "3", the bit data of the ports P ₇ to P ₀ is "111".
10111 ″, and Ldata ← F7 is stored.

Next, in order to light the halogen lamp 1 according to the contents of the stored code address Ldata,
The value of Ldata is output from P ₇ to P ₀ (step S
3). The MSB of the code address Ldata corresponds to the port P ₇ , and the LSB corresponds to the port P ₀ .

Then, it is judged whether or not the brightness of the image projected on the screen 1 projected by the light of the halogen lamp 1 which is turned on is proper (step S4). If the brightness is not proper (NO), the process returns to step S1, the brightness is changed again to a suitable brightness, and if “OK” (YES), the code address Ldata is set on the magnetic recording medium 7 of the slide film 3. A value is written (step S5). In this step S5, the operation for writing the data "1" and "0" shown in FIG. 3 is performed. On the magnetic recording medium 7, the LSB is recorded in order from the MSB of the code address Ldata.

For example, FE _(H) (1111111
0 _(B) ), the recording magnetic head drive circuit 11 scans the recording magnetic head 9 while
In the combination of T _ON and T _OFF shown in (c), the MSB is set to “H”, OUT1 is set to “H”, and OUT0 is set to “L” from the bit “1”. Output is performed, and LSB is "0", OUT1 is "L",
Recording is completed by setting OUT0 to "H".

By such a series of operations, luminance data is recorded on the magnetic recording medium 7 of the slide film 3. Here, when a large number of slide films 3 are loaded in the film magazine, step S5 ends, the slide film 3 is replaced with the next one, and the process returns to step S1. Next, the operation of reading the data (luminance information) from the magnetic recording medium 7 and projecting the data will be described with reference to the flowchart of FIG.

First, when the slide film 3 shown in FIG. 1 is set at a fixed position projected by the halogen lamp 1, the reproducing magnetic head drive circuit 10 is operated, and the reproducing magnetic head 8 is used to move the recording film. Luminance data of the magnetic recording medium 7 is written to the address Ldata (step S11). At this time, when reading the data bit by bit while scanning the reproducing magnetic head 8, scanning is performed from the same position as the position where the writing of the data was started. Therefore, the value of the MSB at the time of writing is read one bit at a time. When the data is stored in the code address Ldata, the MSB is set at the first 1 bit and the LSB is set at the end.

Next, the MSB of the code address Ldata is output to the port P ₇ of the CPU 13 shown in FIG.
Is output to the port P ₀ (step S12). Therefore, based on the data of the magnetic recording medium 7 of the slide film 3, an image is projected on the screen 1 with a suitable brightness.

Next, the film magazine is operated by an automatic change synchronizing signal or the like generated by an external cassette recorder to shift to the next slide (step S).
13). Therefore, when the slide film is continuously viewed, the operations from step S11 are repeated.

As described above, the slide projection apparatus according to the present embodiment automatically adjusts the projection light for each slide film image based on the recorded brightness information, and screens at a suitable brightness. Each image can be projected on the screen. Further, when the slides are continuously viewed using a film magazine or the like, the image quality is clear, and it is possible to easily realize a projection that does not cause fatigue even when viewing for a long time. Further, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications and applications can be made without departing from the scope of the invention.

[0043]

As described in detail above, according to the present invention, it is possible to provide a slide projection apparatus which changes the screen brightness to a suitable screen brightness according to each slide film.

[Brief description of drawings]

FIG. 1 is a diagram showing a basic configuration of a slide projection apparatus as an embodiment according to the present invention.

2 is an example of a circuit for recording / reproducing data (luminance information) from the magnetic recording medium shown in FIG.

FIG. 3 is a diagram showing waveforms of drive signals in the recording / reproducing circuit example shown in FIG.

FIG. 4 shows a specific configuration example of the lamp brightness changing circuit shown in FIG.

FIG. 5 is a flowchart for explaining a data (luminance information) writing operation.

FIG. 6 is a flowchart for explaining an operation of reading data (luminance information) from a magnetic recording medium and projecting the data.

[Explanation of symbols]

1 ... Halogen lamp, 2 ... Reflector, 3 ... Slide film, 4 ... Condenser lens, 5 ... Projection lens, 6 ... Screen, 7 ... Magnetic recording medium, 8 ... Reproducing magnetic head, 9 ...
Recording magnetic head, 10 ... Reproducing magnetic head drive circuit, 1
DESCRIPTION OF SYMBOLS 1 ... Recording magnetic head drive circuit, 12 ... Lamp brightness changing circuit, 13 ... Central processing circuit (CPU), 14 ... Keyboard
21 and 22 ... buffer, 23 ... head amplifier, 24
... differential circuit, 25, 26 ... comparator - data, Q ₀ ~Q ₇ ...
Transistors, R _{0 to} R ₈ ... Resistors, N _{0 to} N ₇ ... NAN
D circuit.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] July 13, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

The data of the slide film 3 obtained by the scanning of the reproducing magnetic head 8 is as follows.
It is taken into the CPU 13 via the reproducing head drive circuit 10. Here, the data taken in by the CPU 13 is the screen brightness information of the slide film 3, and based on this, it is suitable for the slide film 3 to be copied from now on through the lamp brightness changing circuit 12. The halogen lamp 1 is turned on by adjusting the amount of light so that the projected light has a brightness.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

Next, the operator uses the keyboard 14 to obtain the desired screen luminance data (luminance information) from the CPU 1.
Enter in 3. In this embodiment, the keyboard is used,
Whatever the input member as long as that can be externally et input may. The CPU 13 operates the lamp luminance changing circuit 12 based on the inputted luminance information to adjust the luminance of the halogen lamp 1.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

Further, the CPU 13 transfers a control signal for instructing the writing of the luminance information to the magnetic recording medium 7 of the slide film 3 to the recording magnetic head drive circuit 11 , and receives the control signal to drive the recording magnetic head. Circuit 11 is
The recording magnetic head 9 is scanned to write the brightness information on the magnetic recording medium 7. Next, FIGS. 2 and 3 show examples of recording / reproducing circuits and waveforms of their drive signals, and the above-mentioned recording / reproducing system will be described. In this recording / reproducing system, the magnetic recording medium 7 is set in three states, that is, the magnetized state in the N direction, the magnetized state in the S direction, and the neutral state.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

For example, data (dat) from the keyboard 14
It is assumed that "0" is input as a). This "0"
When the data is input, the lamp brightness changing circuit 12 converts the data so that the brightness corresponding to the data is projected on the screen 6 (step S).
2). At this time, first, the lamp brightness changing circuit 12 and the CPU 1
Focusing on the relation of No. 3, the CPU 13 gives the halogen lamp 1 with the brightness of any one of the eight brightness patterns.
When any one of the ports P ₀ to P ₇ is turned on when turning on, all other ports should be turned off.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

Then, it is judged whether or not the brightness of the image on the screen 6 projected by the light of the halogen lamp 1 which is turned on is proper (step S4). If the brightness is not proper (NO), the process returns to step S1, the brightness is changed again to a suitable brightness, and if “OK” (YES), the code address Ldata is set on the magnetic recording medium 7 of the slide film 3. A value is written (step S5). In this step S5, the operation for writing the data "1" and "0" shown in FIG. 3 is performed. On the magnetic recording medium 7, the LSB is recorded in order from the MSB of the code address Ldata.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction content]

Next, the MSB of the code address Ldata is output to the port P ₇ of the CPU 13 shown in FIG.
Is output to the port P ₀ (step S12). Therefore, based on the data of the magnetic recording medium 7 of the slide film 3, an image is projected on the screen 6 with a suitable brightness.

[Procedure Amendment 7]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (2)

[Claims] 1. A slide projector capable of imaging a slide film, comprising: projection brightness adjusting means for adjusting the brightness of a projected image projected on a screen; and magnetic information recorded on a film having a magnetic recording section. A slide projection apparatus comprising: magnetic information reproducing means for outputting; and projection brightness control means for adjusting the brightness of the projection brightness adjusting means based on reproduction information of the magnetic information reproducing means. 2. The slide projection apparatus according to claim 1, further comprising a magnetic information recording unit capable of writing and / or rewriting magnetic information on the film having the magnetic recording unit.