JPH08223367A - Film lighting device - Google Patents

Abstract

PURPOSE: To provide a film lighting device suitable for a computer and a television receiver by using a low-voltage small-sized fluorescent discharge tube for blue and green color light sources and using a red LED excellent in the reproducibility of a red color for a red color light source. CONSTITUTION: A film 20 is arranged on the upper part of a light source section 1 and a monochromatic CCD unit 24 is arranged via a zoom lens 22 behind the film 20. The output of a CCD driver 26 having a clock function to drive the unit 24 is inputted to the unit 24. The output of the unit 24 is inputted to a signal processor 30 having an automatic gain control function and converting the received signal into a video signal. The output of the signal processor 30 is converted into a digital signal via a gain offset control amplifier 31 conducting offset level adjustment and gain adjustment peculiar to a negative/ positive film and a phase flip for phase-inverting the video signal. The signal is stored, subject to arithmetic operation and then displayed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film illuminating device, and more particularly, to a film illuminating device for separating a film into three colors and imaging the film to generate a video signal for computer image input and a television receiver. The present invention relates to a film lighting device.

[0002]

2. Description of the Related Art Conventionally, in a film illuminating device for a device for separating a film into three colors to pick up an image and generate a video signal for inputting a computer image, for example, a film illuminating device is 24 mm
Film with a size of 36 mm (35 mm film size)
L, which emits blue light, green light, and red light when illuminating
Twenty EDs of each color are scattered behind the film in a plane parallel to the plane of the film. The LEDs of each color are driven by a motor and sequentially lighted to generate an image light signal for each color. The film illuminated in this way is scanned and imaged by a linear sensor for each color illumination. Another device for generating a video signal for computer image input is
The film is illuminated by a white light source, the film image is separated by a three-color separation prism, and each color image is captured by an independent area sensor.

[0003]

[Problems to be Solved by the Invention] The above-mentioned conventional LE
In the film illuminating device using D, scanning is performed by a linear sensor, so there is not only a problem that high-speed imaging cannot be performed, but also a sufficient amount of green light and blue light is required to use an area sensor. There was a problem that is difficult. In addition, in the above-mentioned device using the three-color separation prism, in addition to the three area sensors, three types of image signals must be processed simultaneously, and the structure is electrically and optically complicated. There was a problem that it became expensive. As another film lighting device, a device using a low-voltage small fluorescent discharge tube as a light source can be considered. However, in this device, the manufacturing cost of the low-voltage compact fluorescent discharge tube is 20 times as high as that of the LED, and the ON / OFF blinking speed of the low-voltage compact fluorescent discharge tube is L.
There is a problem that it is slower than that of ED. Further, taking red light as an example, as shown in FIG. 3, the spectral characteristic 200 of the low-voltage small fluorescent discharge tube is 6 apart from the red 660 nm.
There is a peak value at 10 nm and a peak value at 660 nm L
The color purity is far lower than the spectral characteristic 202 of the ED. Therefore, when a video signal from a film lighting device using a low-voltage compact fluorescent discharge tube is input to a computer or displayed on a television receiver, the problem of low color reproducibility cannot be avoided.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the conventional film illuminating device and the fact that the negative film has a higher red transmittance than other colors, and the manufacturing cost is low. It is also an object of the present invention to provide a film illuminator that is particularly excellent in red reproducibility as compared with the conventional one.

[0005]

SUMMARY OF THE INVENTION The present invention is a film illuminator for a device for imaging film to generate a video signal for computer image input and for television receivers, which is a low voltage compact fluorescent discharge as a blue and green light source. It is a film lighting device characterized by using a tube and using a red LED as a red light source. In an embodiment of the present invention, the number of red LEDs is twice or more the number of blue low-voltage small fluorescent discharge tubes. Further, the number of the red LEDs is twice or more the number of the green low-voltage small-sized fluorescent discharge tubes.

[0006]

According to the present invention having the above construction, blue light and green light are emitted by the low-voltage small fluorescent discharge tube which is low in manufacturing cost, and red light is emitted by the red LED. In particular, for blue light and green light, high-speed three-color circulation illumination is performed by continuously operating the heater of the low-voltage small fluorescent discharge tube and turning ON / OFF the anode current.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A film illuminator according to an embodiment of the present invention will be described below with reference to the drawings. Light source unit 1 of film lighting device
24 red LEDs as shown in the plan view of FIG.
Four or five green low-voltage compact fluorescent discharge tubes 6 and eight blue low-voltage compact fluorescent discharge tubes 10 are arranged in substantially the same plane. The light source unit 1 is arranged at a position 1 to 3 cm away from the film 20 set at the film mounting position 12 shown in FIG. A diffusion plate 13 is arranged between the light source unit 1 and the film mounting position 12.

A film image pickup device including the above film illumination device has a structure shown in the block diagram of FIG. That is, the film 20 is arranged above the light source unit 1, and the film 752 is arranged above the film 20 via the zoom lens 22.
Monochrome CCD unit 24 having × 582 pixels or more
To place. The monochrome CCD unit 24 has a CCD driver 2 having a clock function for driving the monochrome CCD unit 24.
The output of 6 is input. The output of the monochrome CCD unit 24 has a signal processor 30 which has an automatic gain control function and converts an input signal into a video signal.
Is input to The output of the signal processor 30 is passed through a gain / offset control amplifier 31 which performs offset level adjustment and gain adjustment peculiar to the negative / positive film and a phase flip 34 which inverts the phase of the video signal.
It is input to the A / D converter 36 of the digital circuit 32 and converted into a digital signal. This digital signal is stored, calculated, and further displayed by a known circuit.
Those skilled in the art can easily think of a circuit for outputting the output of the monochrome CCD unit 24 to the computer or the television receiver as the output corresponding to the outputs of the three CCD units.

[0009]

According to the present invention, it is possible to obtain a film illuminating device for computer image input and for a television receiver which has a low manufacturing cost and is particularly excellent in red reproducibility as compared with the conventional one. Has the effect that can.

[Brief description of drawings]

FIG. 1 is a plan view of a light source unit of a film lighting device according to an embodiment of the present invention.

FIG. 2 is a block diagram of a film image pickup device including a film lighting device according to an embodiment of the present invention.

FIG. 3 is a graph showing spectral characteristics of a red low voltage small fluorescent discharge tube and a red LED.

[Explanation of symbols]

 1 Light source part of illumination device 4 Red LED 6 Green low voltage small fluorescent discharge tube 10 Blue low voltage small fluorescent discharge tube 12 Film mounting table 13 Diffuser 20 Film 22 Zoom lens 24 Monochrome CCD unit 26 CCD driver 30 Signal processor 32 Digital circuit 34 phase flip 36 A / D converter

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Claims (3)

[Claims] 1. A film lighting device for imaging a film to generate a video signal for computer image input and for a television receiver, wherein a low voltage compact fluorescent discharge tube is used as a blue and green light source. , A film illuminating device using a red LED as a red light source. 2. The film lighting device according to claim 1, wherein the number of the red LEDs is at least twice the number of the blue low-voltage small fluorescent discharge tubes. 3. The film lighting device according to claim 1, wherein the number of the red LEDs is at least twice the number of the green low-voltage small-sized fluorescent discharge tubes.