JPH0635236Y2 - Gain adjusting device for color component measuring device of negative film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an adjusting mechanism in a negative film color component measuring device for a color photographic printer.

(Prior Art) As this kind of technology, the amount of energy contained in the light source, the negative film and the three primary color separation filter (BG
R) transmission characteristics and the sensitivity of the image sensor (CCD element) to each wavelength are different, so the voltage value due to each three primary color information decomposed by the three primary color separation filter is different, which exceeds the decomposition range in the A / D converter. This causes an overflow phenomenon, and the information of the protruding portion is not input to the CPU.To avoid this, until now the color separation was performed and the ND filter device was used in the process of optically forming an image on the image sensor (CCD element). Provided mechanically according to the degree of light and darkness for all wavelengths. The image is physically attenuated to form an image, and the entire image pickup device (CCD device) is electrically amplified by an amplifier, and the electric strength (analog signal) is converted to A /
The D converter converted the digital signal and the CPU operated according to the procedure to determine the exposure condition.

(Problems to be solved by the device) However, the adjustment of the voltage value by the ND filter device to prevent the overflow phenomenon in the A / D converter is a mechanism operation and is a collective adjustment by one amplifier. However, it requires a space to make the entire apparatus bulky, and the adjusting operation is complicated and time-consuming, which is inconvenient for maintenance and inspection.

(Means for Solving Problems) The present invention proposes a mechanical adjustment in this adjusting function.
It was proposed to eliminate the ND filter device and convert it all to electrical adjustment, and electrically extract the light that was color-separated and imaged by the optical device on the image sensor to form an A / D converter. In a device that converts into an electric signal through an electric circuit including, each amplifier that is provided to operate independently for each decomposed color is connected to the image sensor, and from this amplifier through each analog switch A / D conversion The color separation distribution circuit including the vertical and horizontal clock counting circuits is connected to the image pickup device, and the color separation data stored in the distribution circuit and output by the image pickup device is stored in the analog circuit. A gain adjusting device for a color component measuring device of a negative film, which is connected to send to a switch and sequentially opens and closes each analog switch by output of each color. According to the.

(Function) By passing through an amplifier (amplifier) provided for amplifying the electric signal of each color (BGR) image-formed separately for each color (BGR) on the image sensor (CCD element) independently. , The voltage value of each color is individually adjusted and adjusted to substantially the same value, which is sequentially sent to the A / D converter by the opening / closing operation of the analog switch, converted into a digital signal, and further calculated by the CPU.

The electrical signals from the image sensor are counted by the vertical / horizontal clock counting circuit, and the analog switch of each color is alternately opened / closed based on the color information of each color (BGR) stored in the distribution circuit of each color separation filter. The electric signal adjusted by the amplifier is sequentially sent to the A / D converter.

(Embodiment) Next, an embodiment of the present invention will be specifically described with reference to the drawings.

Fig. 1 is a schematic diagram showing an electric circuit of a gain adjusting device, Fig. 2 is a schematic front view of an image sensor, and (1) is an image sensor, and a light receiving element (photodiode) is integrated and formed on a plane.
For example, D element. On the other hand, a light source (10) is provided and the light is transmitted through a negative film (11) so that each of the three primary colors is simultaneously and separately blue on the image sensor. Green. Red separation imaging (9B) (9G) (9
R) each color separation filter (13B) (13
Equipped with three sets of G) (13R) and lens (12B) (12G) (12R). An individual amplifier (2B) for sequentially extracting electric signals of each color to this image sensor (1) and amplifying them independently.
(2G) (2R) are respectively connected and arranged, connected to the A / D converter (4) via their respective analog switches (3B) (3G) (3R), and an electrical circuit via the CPU (5) ( X), the exposure conditions are determined by calculating each information obtained by separating the three primary colors contained in the negative film (11), and the print exposure device (6)
Operate. A color separation distribution circuit (Y) for separating and counting the three primary colors is a vertical and horizontal clock counting circuit (7).
And a device for storing these counts (8B) (8G)
(8R), each memory device is connected to the analog switch (3B) (3G) (3R) respectively, and sequentially based on the count information of each of the three primary colors stored in the color separation and distribution circuit (Y). It opens and closes the analog switches (3B) (3G) (3R) and sends them to the A / D converter (4). One of the analog switches (3B) (3G) (2R) is operated by this color separation counting control operation. By closing the location, only the electric signal of the corresponding color is allowed to flow, and the other two locations are opened so that the electric signals of the other two primary colors are blocked. The switch (3B) (3G) (3R) is repeatedly opened and closed by being operated by the count information of the three primary colors.

(Effect of device) In this device, an amplifier is connected to the image pickup device so that the three primary colors of the negative film optically decomposed on the image pickup device and imaged on the same plane are operated independently for each color. There is no great difference in the voltage value for each color light because it is provided by this amplifier and is amplified by the amplification value set for each color based on each color and then sent to the A / D converter. Therefore, a normal exposure condition can be constantly determined without causing a trouble such as an overflow phenomenon in the A / D converter or exceeding the conversion (decomposition) amount. Especially, in this system, the large difference in the voltage value generated by each color light is electrically adjusted by the amplifiers that operate independently,
Compared with the conventional mechanical adjustment, the operation is very simple and efficient, and there is an effect that maintenance and inspection can be made extremely easy.

Furthermore, by connecting the count memory of each color separation to each analog switch by a color separation distribution circuit so that the switch can be opened and closed automatically and accurately and quickly based on this count memory, an extremely accurate image formation can be achieved. This has the effect of quickly obtaining information.

[Brief description of drawings]

FIG. 1 is a schematic diagram of an electric circuit of a negative film color component measuring apparatus embodying the present invention, and FIG. 2 is a schematic front view of an image sensor. In the reference numerals of the drawings, (1) is an image sensor, (2B) (2G) (2R)
Is an amplifier, (3B) (3G) (3R) is an analog switch,
(4) is an A / D converter, (7) is a vertical / horizontal clock counting circuit, (9B), (9G), and (9R) are imaging lights, (X) is an amplifier circuit,
(Y) shows a color separation distribution circuit.

Claims (1)

[Scope of utility model registration request] 1. A device for electrically extracting the image-formed light that has been optically color-separated on an image sensor and converting it into an electric signal through an electric circuit including an A / D converter. Each amplifier is connected to the image pickup device and operated via each analog switch.
Connected to send to the A / D converter, while connecting the color separation distribution circuit including the vertical and horizontal clock counting circuit to the image sensor, each of the color signals by the output according to each color in the circuit A gain adjusting device for a negative film color component measuring device, which is connected to open and close an analog switch.