JPH04109754U - Light source unit for linear image sensor - Google Patents

Abstract

(57) [Summary] [Purpose] A shutter is provided in the light source unit of a linear image sensor installed as an image information reading device in a photographic printer to prevent burnout of negative film and to facilitate dark level adjustment. [Structure] A light source unit 10 is provided above a negative film X in opposition to a photometric section 2 (including a scanner unit) that reads image information provided through a lens unit 1. The light from the light source 12 is guided to a total reflection mirror 17 through an aspherical condenser lens 13 and a heat absorbing filter 14, and irradiates the negative film X. A shutter 15 and a rotary solenoid 16 for driving the shutter are provided at the end of the optical path, and normally the optical path is opened.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is based on a linear image sensor that detects image density, etc. in photo printing equipment. The present invention relates to the configuration of a light source used in a service.

0002

[Conventional technology]

Photo printing equipment prints color images from negative film onto photographic paper. In order to print the image density at the optimum density using a light control filter, it is necessary to print the image using a printer. Before printing, use the scanner unit to reset the image density status of each image frame of the negative film. It is read by the near image sensor, and the light control filter and light source are adjusted based on the read data. Adjust the illuminance time and print. When reading such image density for each image frame, the frame's screen position, width, and Frame No. etc., and it is necessary to match these detection data to each frame. Ru. To perform this kind of processing, there is generally a notch located upstream of the printer, for example. code detector, DX code detector, screen detector, or 135/110 perforation The motion detector, linear image sensor, etc. are sequentially moved along the negative film transport path. It is normal that the

0003 Among the above detectors, the linear image sensor has a concave mirror and a halogen lamp on the light source side. A light source unit consisting of a light source, an aspherical condenser lens, a heat absorption filter, etc. A lens unit is installed in which the light is irradiated onto a negative film and the transmitted light is placed oppositely. It is guided to the photometering section through the knit, and the scanner unit in the photometering section separates the colors into three primary colors. is configured to detect the image density of the image.

0004

[Problem that the idea aims to solve]

By the way, in the linear image sensor mentioned above, the light from the light source is generated when the power is turned on. and is always irradiated onto negative film. However, the feed of negative film is The processing speed of the printing unit installed in a later process position, or the photometry unit itself The processing speed of the Sometimes it is stopped. If the negative film continues to be irradiated with light from a light source while its advance is stopped, the film will burnout, resulting in a serious accident.

[0005] Also, when detecting image density using the scanner unit in the photometry section, it is difficult to use it for a long period of time. The light-receiving sensitivity of the light-receiving element of the scanner unit changes little by little while using the scanner. Therefore, every time a certain period of time passes, the dark level, which is the standard of the light reception condition from the light source, is Need to adjust. However, in this case as well, the light from the light source remains irradiated onto the negative film, so the light source The light level cannot be adjusted independently.

[0006] This idea was developed by taking into account the above-mentioned problems inherent in conventional linear image sensors. A shutter unit is installed at the end of the optical path of the light source unit to prevent burnout of the negative film. The objective of the present invention is to provide a light source unit that allows dark level adjustment to be easily performed. do.

[0007]

[Means to solve the problem]

In order to solve the above problem, this idea was developed to develop a technology for detecting the image density of negative film. It is installed opposite to the scanner unit and directs the light from the light source to the lens unit and filter unit. A shutter unit is installed at the end of the optical path of the light source unit that illuminates the negative film through the film. The structure of the light source unit for a linear image sensor is provided with a light source unit for a linear image sensor.

[0008]

[Effect]

The light from the light source unit configured as above normally operates the linear image sensor. When printing, the shutter is open and the optical path is open, so the negative film can be directly inserted. irradiated to the room. When feeding the negative film is stopped, do not stop it for a certain period of time to prevent burnout. If the stop continues, the shutter is activated to close the optical path. Also, the light reception level may change little by little during long-term use. In some cases, the shutter is activated to adjust the dark level, which is the standard for the light intensity level of the image information. Make adjustments.

[0009]

【Example】

Examples of this invention will be described below with reference to the drawings.

0010 Figure 1 shows the overall schematic configuration of a linear image sensor equipped with the light source unit of this invention. FIG. Below the negative film A scanner unit consisting of the following is provided. Although not shown, inside the photometry section 2 is equipped with a scanner consisting of three primary color separation filters, an image sensor, etc. This allows the image information from the transmitted light of the negative film X to be separated into three primary colors. and read. A light source unit 1 is provided on the opposite side of the negative film 0 is set. The light source unit 10 includes a concave mirror 11 and a halogen lamp 12. The light source is equipped with an aspherical condenser lens 13, a heat absorbing filter 14, etc. . Furthermore, a shutter 15 is provided at the end of the optical path of the scanner unit and is driven to open and close. A rotary solenoid 16 is provided. 17 refracts the optical path at right angles It is a total reflection mirror for

[0011] In the linear image sensor of this embodiment configured as described above, the negative film During normal operation to read image information, the shutter 15 is at the position indicated by the dashed line in the figure. be. For this reason, the optical path opening (not shown) of the unit box is opened.

0012 The light from the light source 12 is sent out through a lens 13 and a filter 14, and a total reflection mirror At 17, the optical path is bent toward the negative film X, and the negative film X is irradiated. The feeding of negative film If the irradiation continues, set a certain amount of time in advance so as not to burn out the film, and then When the output signal exceeds the 6 to move the shutter 15 to the position shown by the solid line, thereby closing the optical path. Negaf When the feeding of the film X is resumed, the shutter 15 is opened again.

[0013] The opening and closing of the shutter 15 is performed to determine the image condition when reading the image information of the negative film. It can also be used in the same way to adjust the dark level, which is the standard for illuminance. . At this time, of course, a control signal different from the one described above must be input to the control circuit to trigger the shutter. 15 opening and closing.

[0014]

【effect】

As explained in detail above, the light source unit of this invention has a shutter at the end of its optical path. The optical path is open during normal operation, and there is a risk of burnout of the negative film or dark When adjusting the level, the shutter was activated to close the optical path, so the negative This prevents burnout of the lume and maintains the dark level required during long-term use. Advantages such as adjustment can be easily performed with the light source turned on are obtained.

[Brief explanation of drawings]

[Fig. 1] A perspective view showing the overall schematic configuration of a linear image sensor according to an example.

[Explanation of symbols]

1 Lens unit 2 Photometry section X negative film 10 Light source unit 11 Concave mirror 12 Light source 13 Aspheric condenser lens 14 Heat absorbing filter 15 Shutter 16 Rotary solenoid 17 Total reflection mirror

Claims (1)

[Scope of utility model registration request] 1. A shutter unit is provided at the end of the optical path of a light source unit that is disposed opposite to a scanner unit that detects the image density of a negative film and that irradiates light from a light source onto the negative film via a lens unit and a filter unit. A light source unit for linear image sensors.